CN117262186A - Ship fuel supply system - Google Patents
Ship fuel supply system Download PDFInfo
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- CN117262186A CN117262186A CN202311206798.0A CN202311206798A CN117262186A CN 117262186 A CN117262186 A CN 117262186A CN 202311206798 A CN202311206798 A CN 202311206798A CN 117262186 A CN117262186 A CN 117262186A
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- fuel
- control module
- pressure
- balance control
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- 239000000446 fuel Substances 0.000 title claims abstract description 517
- 239000002828 fuel tank Substances 0.000 claims abstract description 210
- 239000007788 liquid Substances 0.000 claims abstract description 77
- 230000009471 action Effects 0.000 claims abstract description 67
- 239000007791 liquid phase Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 45
- 230000001105 regulatory effect Effects 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 44
- 230000001276 controlling effect Effects 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 27
- 239000000295 fuel oil Substances 0.000 claims description 15
- 238000001704 evaporation Methods 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 230000010485 coping Effects 0.000 abstract description 6
- 230000033228 biological regulation Effects 0.000 abstract description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 14
- 239000006200 vaporizer Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a ship fuel supply system, which comprises two fuel tanks, a fuel pump assembly, a BOG compressor, fuel equipment, a balance control module, a fuel filling liquid inlet pipeline and a fuel filling air return pipeline, wherein the fuel tank is connected with the fuel pump assembly; the fuel pump assembly comprises low-pressure fuel pumps which are respectively arranged in the two fuel cabins, the fuel filling liquid inlet pipeline is respectively connected with the two fuel cabins through liquid phase filling valves, and the fuel filling air return pipeline is respectively connected with the two fuel cabins through air return valves; the balance control module is respectively connected with the low-pressure fuel pump, the BOG compressor, the liquid phase filling valve and the air return valve in an electric signal mode so as to control the ship fuel supply system to execute different actions. The ship fuel supply system can automatically regulate and control the liquid level difference and the pressure difference of two fuel tanks during fuel filling and fuel supply, so that the original manual operation regulation and control are reduced or avoided, the load of a crew is lightened, the capability of the system for coping with emergency conditions is improved, and the stability of the system is improved.
Description
Technical Field
The invention relates to the technical field of ships, in particular to a ship fuel supply system.
Background
During operation of the marine fuel supply system, the situation involved in switching the moving equipment (i.e. the rotating equipment driven by the driving machine, i.e. the equipment with energy consumption, such as pumps, compressors, fans, etc.) is relatively complex, mainly comprising the following usage scenarios:
1. the fuel supply system of the ship mostly adopts two independent fuel cabins, and the two fuel cabins are symmetrically arranged on the port and starboard of the ship. The ship fuel supply system selects one of the fuel tanks, and transmits the fuel in the fuel tank to subsequent pressurizing heat exchange equipment and the like, so as to supply fuel to fuel equipment (including a ship host, a ship boiler and the like). When the liquid level of one of the tanks differs significantly from the liquid level of the other tank, the load balance of the vessel is affected. At this time, it is necessary to switch the system supply process from the low-level fuel tank to the high-level fuel tank. The process is most often manually operated, and the operator stops the fuel supply pump and supply valve of one fuel tank and opens the fuel supply pump and supply valve of the other fuel tank.
In addition, due to abnormal conditions such as thermal insulation failure of a single fuel tank, a large difference in pressure between the two fuel tanks is caused. The pressure difference between the two tanks mainly affects the supply pressure stabilization of the fuel pump or compressor during switching: when fuel supply is switched from one fuel tank to another, if the pressure difference between the fuel tanks is large, the inlet pressures of the BOG compressor and the low-pressure fuel pump are excessively different from those before switching, and the switching process easily causes fluctuation in the fuel supply pressure. At this time, it is necessary to manually open the BOG process of the corresponding fuel tanks or to open the corresponding balance lines to ensure that the pressures of the two fuel tanks remain relatively balanced.
The manual switching process can cause fuel supply pressure fluctuation, if improper operation can cause supply temperature or pressure alarm, a control or safety system is triggered, the supply process is cut off, and the ship engine is converted into a fuel mode.
2. Marine fuel delivery systems typically are configured with backup power plants such as two low pressure fuel pumps, two high pressure fuel pumps, two BOG compressors, two water/glycol pumps, and the like. Only one of the devices is operated in actual operation, and the other device is in a standby state. When one of the devices fails to alarm, trigger a control or safety system, the system first switches to the other standby device. The process mostly adopts automatic switching, but only adopts delay-started control logic, namely, the system switches to standby equipment after detecting that the pressure is continuously low/high for a period of time. If the switching process is carried out under high load of the supply system, the temperature or pressure parameter of the system can still be caused to fluctuate, and an alarm is triggered when the switching process is serious.
3. The marine fuel delivery system comprises a plurality of delivery conditions, generally including: the fuel pump supply condition, the compressor supply condition, and the fuel pump and compressor common supply condition. The switching of the dynamic device may be involved in different operating modes, such as switching from a fuel pump supply to a fuel pump and compressor common supply, switching from a compressor supply to a fuel pump and compressor common supply, switching from a fuel pump and compressor common supply to a fuel pump supply, and switching from a fuel pump and compressor common supply to a compressor supply. The supply conditions require close attention to the variation of the supply pressure during the switching process, and if the control is not proper, a low pressure or high pressure risk is generated.
In view of the above, it is necessary to design a ship fuel supply system capable of automatically maintaining balance of fuel tank level and pressure, balance of equipment use time, and ensuring stable operation of the supply system during switching of the dynamic equipment.
Disclosure of Invention
The invention aims to provide a ship fuel supply system which can automatically regulate and control the liquid level difference and the pressure difference of two fuel tanks during fuel filling and fuel supply to keep stable, reduce or avoid the original manual operation regulation, lighten the burden of a shipman, improve the capability of the system for coping with emergency conditions and improve the stability of the system.
The invention provides a ship fuel supply system, which comprises two fuel tanks, a fuel pump assembly, a BOG compressor, fuel equipment, a balance control module, a fuel filling liquid inlet pipeline and a fuel filling air return pipeline, wherein the fuel tank is connected with the fuel pump assembly; the two fuel tanks are respectively arranged on the port side and the starboard side of the ship; the fuel pump assembly comprises low-pressure fuel pumps respectively arranged in two fuel tanks, and the low-pressure fuel pumps in the two fuel tanks are connected with the fuel equipment so as to supply liquid fuel in the fuel tanks to the fuel equipment; the BOG compressors are respectively connected with the two fuel tanks and the fuel equipment so as to supply fuel evaporation gas in the fuel tanks to the fuel equipment; the fuel filling liquid inlet pipeline is connected with the fuel filling ports of the two fuel tanks through liquid phase filling valves respectively, and the fuel filling air return pipeline is connected with the air return ports of the two fuel tanks through air return valves respectively; the balance control module is respectively connected with the low-pressure fuel pump, the BOG compressor, the liquid phase filling valve and the return air valve in an electric signal mode, and the balance control module is used for controlling the ship fuel supply system to execute the following actions:
Action one: when the ship fuel supply system is in a filling mode, if the liquid level difference between the two fuel tanks exceeds a preset value, the balance control module controls the liquid phase filling valve and the air return valve of the high-liquid-level fuel tank to be closed, so that the fuel filling liquid inlet pipeline only fills fuel into the low-liquid-level fuel tank; when the liquid level difference between the two fuel tanks is smaller than the preset value, the balance control module controls the closed liquid phase filling valve and the air return valve to be opened again;
action two: when the ship fuel supply system is in a supply mode, if the liquid level difference between the two fuel tanks exceeds a preset value, the balance control module controls the low-pressure fuel pump in the low-liquid-level fuel tank to uniformly reduce the operating frequency of the low-pressure fuel pump until the low-pressure fuel pump in the low-liquid-level fuel tank stops operating; simultaneously, the low-pressure fuel pump in the high-liquid-level fuel cabin is controlled to be started, and the initial operating frequency of the low-pressure fuel pump in the high-liquid-level fuel cabin is the operating frequency of the low-pressure fuel pump in the low-liquid-level fuel cabin before switching;
and action III: when the ship fuel supply system is in a filling mode, if the pressure difference between the two fuel tanks exceeds a set value, the balance control module controls the opening of a return air valve of the high-pressure fuel tank and controls the closing of a return air valve of the low-pressure fuel tank; when the pressure difference between the two fuel tanks is smaller than the set value, controlling the closed air return valve to be opened again;
And action four: when the ship fuel supply system is in a supply mode, if the pressure difference between the two fuel tanks exceeds a set value and the fuel equipment is in a high-load supply working condition with a load of more than or equal to 50%, the balance control module controls the BOG compressor to be started so as to treat fuel vapor in the high-pressure fuel tanks; when the pressure difference between the two fuel tanks is smaller than the set value, controlling the BOG compressor to be closed;
if the pressure difference between the two fuel tanks exceeds a set value and the fuel equipment is in a low-load supply working condition with a load less than 50%, the balance control module controls the air return valves of the two fuel tanks to be opened so as to enable the two fuel tanks to be communicated through the fuel filling air return pipeline; and when the pressure difference between the two fuel tanks is smaller than the set value, controlling the air return valves of the two fuel tanks to be closed.
Under the high-load supply working condition, the fuel supply quantity brought by the BOG compressor is smaller than the total fuel supply quantity after the BOG compressor is started, so that the influence on the pump supply process after the BOG compressor is started is smaller (namely, the fuel is mainly supplied by the low-pressure fuel pump, and the low-pressure fuel pump only needs to adjust the operating frequency of the low-pressure fuel pump to ensure the stability of the fuel supply pressure and flow after the BOG compressor is started), and a BOG compressor exhaust mode is adopted to treat the high-pressure fuel tank. Under the low-load supply working condition, the fuel supply amount brought by the BOG compressor accounts for a relatively large proportion of the total fuel supply amount after the BOG compressor is started, so that the influence on the pump supply process after the BOG compressor is started is large (after the BOG compressor is started, the low-pressure fuel pump needs to be greatly adjusted in operating frequency to ensure the stability of fuel supply pressure and flow), and therefore a pressure balance mode of gas exchange among fuel tanks is selected for processing.
Further, two low-pressure fuel pumps which are arranged in parallel are arranged in each fuel cabin; when the balance control module controls the ship fuel supply system to execute the second action, the balance control module controls the low-pressure fuel pumps with shorter running time in the high-liquid-level fuel cabin to be started, so that the running time difference between the low-pressure fuel pumps is reduced, and the service life of equipment is prolonged.
Further, two low-pressure fuel pumps which are arranged in parallel are arranged in each fuel cabin; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
action five: when the ship fuel supply system is in a supply mode, if the low-pressure fuel pump in the currently used fuel cabin fails, the balance control module preferentially controls the other low-pressure fuel pump in the currently used fuel cabin to be started; if the other low-pressure fuel pump in the currently used fuel tank fails to be normally started, the balance control module controls the low-pressure fuel pump with the lower running time in the other fuel tank to be started.
Further, the number of the BOG compressors is two, and the two BOG compressors are arranged in parallel; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
Action six: when one of the BOG compressors fails in operation, the balance control module controls the other BOG compressor to be started.
Further, the balance control module preferentially controls the turning on of the BOG compressor with less running time when controlling the ship fuel supply system to execute the fourth action.
Further, when the ship fuel supply system is in a fuel pump and compressor common supply mode, if the BOG compressor fails, the balance control module controls the other BOG compressor to be started, and simultaneously controls the low-pressure fuel pump to increase the operating frequency of the low-pressure fuel pump within a period of time; after the other BOG compressor is started smoothly, the balance control module controls the low-pressure fuel pump to restore the operating frequency, so that the influence of the supply pressure and the supply flow of the fuel in the switching process is reduced.
Further, a high-pressure fuel pump is arranged between the low-pressure fuel pumps in the two fuel tanks and the fuel equipment, and the balance control module is electrically connected with the high-pressure fuel pumps; the number of the high-pressure fuel pumps is two, and the two high-pressure fuel pumps are arranged in parallel; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
Action seven: when one of the high-pressure fuel pumps fails in operation, the balance control module controls the other high-pressure fuel pump to be started.
Further, the ship fuel supply system further comprises a first heat exchange system, a fuel heating device is arranged between the low-pressure fuel pumps in the two fuel tanks and the fuel device, the first heat exchange system is connected with the fuel heating device, and the first heat exchange system is used for heating the fuel heating device; the first heat exchange system comprises a heat source pipeline, a first circulating pump for circulating and conveying a heat exchange medium and a heater for exchanging heat with a heat source, wherein the heat source pipeline is provided with a heat source regulating valve, the first circulating pump is respectively connected with the fuel heating equipment and the heater, and the heater is respectively connected with the fuel heating equipment and the heat source pipeline;
the heat exchange medium is, for example, water/glycol, then the first circulation pump is a water/glycol pump and the heater is a water/glycol heater. In the working process, the heat exchange medium circularly flows among the first circulating pump, the heater and the fuel heating equipment, and the power of the heat exchange medium circularly flows is derived from the first circulating pump; the heat exchange medium can exchange heat with a heat source (such as cylinder sleeve hot water) in the heat source pipeline in the heater, so that the heat exchange medium is heated; the heat exchange medium after temperature rise exchanges heat with low-temperature fuel in the fuel heating equipment, so that the low-temperature fuel is heated to meet the supply temperature of the fuel equipment;
The balance control module is respectively connected with the first circulating pump and the heat source regulating valve in an electric signal manner; the number of the first circulating pumps is two, and the two first circulating pumps are arranged in parallel; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
action eight: when one of the first circulating pumps fails in operation, the balance control module controls a heat source regulating valve on the heat source pipeline to increase the opening degree of the heat source regulating valve, and controls the other first circulating pump to be opened; and after the other first circulating pump is smoothly started, the opening degree of the heat source regulating valve is regulated. The first circulating pump can cause fluctuation of circulating flow of the heat exchange medium in the switching process, so that the temperature of the heat exchange medium in a short time is increased by increasing the flow of the heat source, insufficient heat caused by the reduction of the flow of the heat exchange medium in the switching process is offset, and supply temperature fluctuation of fuel is ensured to meet the requirement of fuel equipment.
Further, the number of the heaters and the number of the heat source pipelines are two, the two heaters are arranged in series, and the two heaters are respectively connected with the two heat source pipelines. When the balance control module controls the ship fuel supply system to execute the action eight, after one of the first circulating pumps fails in operation, the balance control module can also control the heat source regulating valve on the standby heat source pipeline to be opened, namely, the two heaters are utilized to heat the heat exchange medium at the same time, so that the temperature of the heat exchange medium in a short time is increased, and the temperature fluctuation is reduced.
Further, the fuel devices include a high-pressure fuel device, which may be a marine main engine, and a low-pressure fuel device, which may be a marine engine, a marine boiler, or the like. The fuel heating device comprises a high-pressure carburetor and a low-pressure carburetor, the high-pressure fuel pump and the high-pressure carburetor are arranged between the low-pressure fuel pump and the high-pressure fuel device, and the low-pressure carburetor is arranged between the low-pressure fuel pump and the low-pressure fuel device; the BOG compressor is connected to the low pressure fuel device for supplying fuel to the low pressure fuel device. In this case the fuel may be LNG and the high pressure vaporizer may vaporize the LNG to natural gas. The first heat exchange system is connected with the high-pressure vaporizer and the low-pressure vaporizer respectively so as to heat the high-pressure vaporizer and the low-pressure vaporizer.
Further, the ship fuel supply system further comprises a second heat exchange system, a BOG preheater is further arranged between the BOG compressor and the two fuel tanks, a BOG cooler is further arranged between the BOG compressor and the fuel equipment, the second heat exchange system is respectively connected with the BOG preheater and the BOG cooler, and the second heat exchange system is used for heating the BOG preheater and cooling the BOG cooler; the second heat exchange system comprises a cold source pipeline, a second circulating pump for circulating and conveying heat exchange media and a heat exchange media cooler for exchanging heat with a cold source, wherein a cold source regulating valve is arranged on the cold source pipeline, the second circulating pump is respectively connected with the BOG preheater, the BOG cooler and the heat exchange media cooler, and the heat exchange media cooler is respectively connected with the cold source pipeline, the BOG preheater and the BOG cooler;
The heat exchange medium is, for example, water/glycol, and the second circulation pump is a water/glycol pump, and the heat exchange medium cooler is a water/glycol heater. In the working process, the heat exchange medium circularly flows among the second circulating pump, the heat exchange medium cooler and the BOG cooler on one hand, and can circularly flow among the second circulating pump, the heat exchange medium cooler and the BOG preheater on the other hand; the heat exchange medium can exchange heat with the cold source in the cold source pipeline in the heat exchange medium cooler, so that the temperature of the heat exchange medium is reduced. On the one hand, the cooled heat exchange medium exchanges heat with the low-temperature BOG in the BOG preheater so as to heat the low-temperature BOG (because the temperature of the low-temperature BOG is very low, the temperature of the heat exchange medium is higher than that of the low-temperature BOG, so that the low-temperature BOG can be heated by exchanging heat with the low-temperature BOG); the cooled heat exchange medium exchanges heat with the high-temperature BOG in the BOG cooler, so that the high-temperature BOG is cooled;
the balance control module is respectively connected with the second circulating pump and the cold source regulating valve in an electric signal manner; the number of the second circulating pumps is two, and the two second circulating pumps are arranged in parallel; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
Action nine: when one of the second circulating pumps fails in operation, the balance control module controls a cold source regulating valve on the cold source pipeline to increase the opening degree of the cold source regulating valve, and controls the other second circulating pump to be started; and after the other second circulating pump is smoothly started, the opening degree of the cold source regulating valve is regulated. Because the second circulating pump can cause fluctuation of the circulating flow of the heat exchange medium in the switching process (the circulating flow of the heat exchange medium can be temporarily reduced), the insufficient cold caused by the reduction of the flow of the heat exchange medium in the switching process is counteracted by increasing the flow of the cold source, and further, the supply temperature fluctuation of the BOG is ensured to meet the requirements of fuel equipment.
Further, the marine fuel supply system has a fuel pump supply mode, a compressor supply mode, a fuel pump and compressor common supply mode. The number of the BOG compressors is two, and the two BOG compressors are arranged in parallel; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
action ten: when the ship fuel supply system is switched from a fuel pump supply mode to a fuel pump and compressor common supply mode, the balance control module preferentially controls the BOG compressor with shorter running time to be started, and the BOG compressor preferentially processes fuel vapor in a fuel cabin with higher pressure;
When the ship fuel supply system is switched from a compressor supply mode to a fuel pump and compressor common supply mode, the balance control module preferentially controls the low-pressure fuel pump with higher liquid level and lower operation time in the fuel cabin to be started;
when the ship fuel supply system is switched from the common supply mode of the fuel pump and the compressor to the supply mode of the fuel pump, the balance control module controls the frequency initial value of the low-pressure fuel pump to be a preset frequency parameter in the working condition database.
Further, the ship fuel supply system further comprises a return pipeline, one end of the return pipeline is connected with the outlet pipeline of the BOG compressor, the other end of the return pipeline is connected with the inlet pipeline of the BOG compressor, and the return pipeline is used for partially returning the fuel vapor processed by the BOG compressor so as to adjust the supply quantity of the fuel vapor; the return line is provided with a return regulating valve, and the balance control module is electrically connected with the return regulating valve; the balance control module is also used for controlling the ship fuel supply system to execute the following actions:
action eleven: when the ship fuel supply system is switched from a fuel pump and compressor common supply mode to a compressor supply mode, the balance control module controls a return flow regulating valve on the return pipe to be closed so as to relieve the influence of the switching process on the supply pressure; and then the balance control module adjusts the opening degree of the reflux regulating valve to ensure that the supply pressure meets the requirement.
Further, the two fuel tanks are provided with a pressure sensor and a liquid level sensor, the pressure sensor is used for monitoring the pressure of the fuel tank, and the liquid level sensor is used for monitoring the liquid level of the fuel tank. The pressure sensor and the liquid level sensor are electrically connected with the balance control module, so that the balance control module can judge and make corresponding control actions according to the measured pressure value and the measured liquid level value.
Further, pressure transmitters (not shown) are further arranged on the outlet pipeline of the BOG compressor, the outlet pipeline of the low-pressure fuel pump, the outlet pipeline of the high-pressure fuel pump, the outlet pipeline of the first circulating pump, the outlet pipeline of the second circulating pump and the like, and all the pressure transmitters are electrically connected with the balance control module. When the pressure transmitter at the outlet of the equipment is high or low, alarming and lasting for a period of time, the dynamic equipment is considered to be invalid.
Further, each pipeline is also provided with a control valve, and the control valve is connected with the balance control module through an electric signal.
According to the ship fuel supply system provided by the invention, the balance control module is arranged, so that the balance control module can automatically regulate and control the low-pressure fuel pump, the BOG compressor, the liquid phase filling valve and the air return valve, thereby automatically regulating and controlling the liquid level difference and the pressure difference of the two fuel tanks during fuel filling and fuel supply to keep stable, reducing or avoiding the original manual operation regulation and control, relieving the burden of a crew, and improving the capability of the system for coping with sudden conditions; meanwhile, the influence on the system supply pressure and supply temperature during the control of the equipment can be reduced as much as possible, and the stability of the system is improved.
Drawings
Fig. 1 is a schematic structural view of a ship fuel supply system according to an embodiment of the present invention.
Fig. 2 is a schematic control logic diagram of a balance control module according to an embodiment of the invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The terms upper, lower, left, right, front, rear, top, bottom and the like (if any) in the description and in the claims are used for descriptive purposes and not necessarily for describing relative positions of structures in the figures and in describing relative positions of structures. It should be understood that the use of directional terms should not be construed to limit the scope of the application as claimed.
As shown in fig. 1 and 2, the ship fuel supply system provided by the embodiment of the invention comprises two fuel tanks 1, a fuel pump assembly, a BOG compressor 2, a fuel device 3, a balance control module 4, a fuel filling liquid inlet pipeline 51 and a fuel filling air return pipeline 52. The fuel tanks 1 are used for storing fuel (the fuel may be LNG, liquid ammonia, etc.), and the two fuel tanks 1 are provided separately on the port and starboard of the ship (specifically, the two fuel tanks 1 are symmetrically arranged on the port and starboard of the ship) to ensure the load balance of the ship.
The fuel pump assembly comprises low-pressure fuel pumps 61 respectively arranged in the two fuel tanks 1 (namely, the low-pressure fuel pumps 61 are arranged in the two fuel tanks 1), the low-pressure fuel pumps 61 in the two fuel tanks 1 are connected with the fuel equipment 3, and the low-pressure fuel pumps 61 can pump out the fuel in the fuel tanks 1 so as to supply the liquid fuel in the fuel tanks 1 to the fuel equipment 3 (the fuel equipment 3 is equipment for consuming the fuel, and the fuel equipment 3 can be a ship host, a ship generator, a ship boiler and the like).
The BOG compressor 2 is respectively connected to the two fuel tanks 1 and the fuel device 3 (specifically, the BOG compressor 2 is connected to a Gas phase outlet of the fuel tank 1), and the BOG compressor 2 is configured to pressurize a fuel vapor (i.e., BOG, boil-Off Gas, i.e., a Gas generated after the vaporization of the liquid fuel) in the fuel tank 1 and then supply the pressurized fuel vapor to the fuel device 3.
The fuel filling inlet pipe 51 is connected with the fuel filling ports of the two fuel tanks 1 through liquid phase filling valves 53 respectively (namely, the liquid phase filling valves 53 are respectively arranged between the two fuel tanks 1 and the fuel filling inlet pipe 51), and the fuel filling return pipe 52 is connected with the return ports of the two fuel tanks 1 through return valves 54 respectively (namely, return valves 54 are respectively arranged between the two fuel tanks 1 and the fuel filling return pipe 52). A refuel inlet line 51 and a refuel return line 52 are used for refuelling the fuel tank 1. When the fuel is filled, the fuel filling liquid inlet pipeline 51 and the fuel filling air return pipeline 52 are connected with corresponding pipelines in the fuel filling station, and liquid fuel from the fuel filling station is respectively injected into the two fuel tanks 1 through the fuel filling liquid inlet pipeline 51; at the same time, the gas in both tanks 1 is discharged to the fueling station via the fueling return air line 52 to maintain the pressure in the tanks 1 stable.
The balance control module 4 is electrically connected with the low-pressure fuel pump 61, the BOG compressor 2, the liquid-phase filling valve 53 and the air return valve 54 respectively, and the balance control module 4 is used for controlling the ship fuel supply system to execute the following actions:
action one: when the marine fueling system is in a fueling mode (i.e. fueling the tanks 1), the balance control module 4 controls both the liquid phase fueling valve 53 and the return air valve 54 of both tanks 1 to open. If the liquid level difference between the two fuel tanks 1 exceeds a preset value, the balance control module 4 controls the liquid phase filling valve 53 and the air return valve 54 of the high-liquid-level fuel tank 1 to be closed, so that the fuel filling liquid inlet pipeline 51 only fills fuel into the low-liquid-level fuel tank 1; when the liquid level difference between the two fuel tanks 1 is smaller than the preset value, the balance control module 4 controls the closed liquid phase filling valve 53 and the air return valve 54 to be opened again (namely, the closed liquid phase filling valve 53 and the air return valve 54 are opened again); thereby ensuring that the liquid level difference between the two fuel tanks 1 is within a preset range in the process of fueling, and further ensuring the load balance of the ship.
Action two: when the marine fuel supply system is in a supply mode (i.e. when the fuel tanks 1 are supplying fuel to the fuel plant 3), the balance control module 4 controls the operation of the low pressure fuel pump 61 in one of the fuel tanks 1, i.e. to supply fuel to the fuel plant 3 with one of the fuel tanks 1. If the liquid level difference between the two fuel tanks 1 exceeds a preset value, the balance control module 4 controls the low-pressure fuel pump 61 in the low-liquid-level fuel tank 1 to uniformly reduce the operation frequency until the low-pressure fuel pump 61 in the low-liquid-level fuel tank 1 stops operating; the low pressure fuel pump 61 in the high level fuel tank 1 is controlled to be turned on at the same time, and the initial operation frequency of the low pressure fuel pump 61 in the high level fuel tank 1 is the operation frequency of the low pressure fuel pump 61 in the low level fuel tank 1 before switching (for example, the operation frequency of the low pressure fuel pump 61 in the low level fuel tank 1 before switching is 90Hz; at the time of switching, the operation frequency of the low pressure fuel pump 61 in the low level fuel tank 1 is uniformly reduced until the operation is stopped, and at the same time, the low pressure fuel pump 61 in the high level fuel tank 1 is started to operate at the operation frequency of 90 Hz), thereby ensuring that the supply pressure and the supply flow rate of the system remain stable at the time of switching.
And action III: when the ship fuel supply system is in the filling mode, the balance control module 4 controls both the liquid phase filling valve 53 and the return air valve 54 of the two fuel tanks 1 to be opened. If the pressure difference between the two fuel tanks 1 exceeds the set value, the balance control module 4 controls the air return valve 54 of the high-pressure fuel tank 1 to be opened, and controls the air return valve 54 of the low-pressure fuel tank 1 to be closed, so that the pressure of the high-pressure fuel tank 1 is reduced, and the pressure of the low-pressure fuel tank 1 is increased to reduce the pressure difference between the two; when the pressure difference between the two fuel tanks 1 is smaller than the set value, the closed return air valve 54 is controlled to be opened again (i.e. the closed return air valve 54 is opened again).
And action four: when the ship fuel supply system is in the supply mode, and no BOG compressor 2 is engaged in the fuel supply at this time; if the pressure difference between the two fuel tanks 1 exceeds the set value and the fuel device 3 is in a high load supply condition with a load greater than or equal to 50% (i.e. the load of the fuel device 3 is greater than or equal to 50%), the balance control module 4 controls the BOG compressor 2 to be turned on to process the fuel vapor in the high pressure fuel tank 1 (i.e. a control valve (not shown) between the high pressure fuel tank 1 and the BOG compressor 2 is turned on to discharge the fuel vapor in the high pressure fuel tank 1 to the BOG compressor 2 for processing, and a control valve between the low pressure fuel tank 1 and the BOG compressor 2 is turned off); and when the pressure difference between the two fuel tanks 1 is smaller than the set value, controlling the BOG compressor 2 to be turned off. In the supply mode, if the BOG compressor 2 participates in the fuel supply at this time, the balance control module 4 does not need to operate, and the BOG compressor 2 automatically processes the high-pressure fuel tank 1 to the set pressure.
If the pressure difference between the two fuel tanks 1 exceeds the set value and the fuel device 3 is in a low-load supply condition with a load less than 50% (i.e. the load of the fuel device 3 is less than 50%), the balance control module 4 controls the air return valves 54 of the two fuel tanks 1 to be opened so that the two fuel tanks 1 are communicated through the fuel filling air return pipeline 52 for gas exchange, thereby reducing the pressure difference between the two fuel tanks 1; when the pressure difference between the two fuel tanks 1 is smaller than the set value, the air return valves 54 of the two fuel tanks 1 are controlled to be closed.
Under the high-load supply working condition, the fuel supply amount brought by the BOG compressor 2 accounts for a smaller proportion of the total fuel supply amount after the BOG compressor 2 is started, so that the influence on the pump supply process after the BOG compressor 2 is started is smaller (namely, the fuel is mainly supplied by the low-pressure fuel pump 61, and the low-pressure fuel pump 61 only needs to adjust the operating frequency of the low-pressure fuel pump 61 in a small range after the BOG compressor 2 is started so as to ensure the stability of the fuel supply pressure and flow), and the high-pressure fuel tank 1 is treated by adopting the exhaust mode of the BOG compressor 2. In the low-load supply condition, the ratio of the fuel supply amount to the total fuel supply amount brought by the BOG compressor 2 after the BOG compressor 2 is turned on is relatively large, so that the pump supply process is greatly influenced after the BOG compressor 2 is turned on (the low-pressure fuel pump 61 needs to greatly adjust the operating frequency after the BOG compressor 2 is turned on to ensure the stability of the fuel supply pressure and flow), and therefore, the pressure balance mode of gas exchange between the fuel tanks 1 is selected for processing.
According to the ship fuel supply system provided by the embodiment of the invention, the balance control module 4 is arranged, and the balance control module 4 can automatically regulate and control the low-pressure fuel pump 61, the BOG compressor 2, the liquid phase filling valve 53 and the air return valve 54, so that the liquid level difference and the pressure difference of the two fuel tanks 1 during fuel filling and fuel supply are automatically regulated and controlled to be stable, original manual operation regulation and control are reduced or avoided, the burden of a shipman is lightened, and the capability of the system for coping with emergency conditions is improved (namely, the focus of the invention is on the control logic of the balance control module 4); meanwhile, the influence on the system supply pressure and supply temperature during the control of the equipment can be reduced as much as possible, and the stability of the system is improved.
Further, as shown in fig. 1, in the present embodiment, two low-pressure fuel pumps 61 are provided in each fuel tank 1 in parallel (i.e., two low-pressure fuel pumps 61 in each fuel tank 1 are provided in parallel and are connected to the fuel apparatus 3, and two low-pressure fuel pumps 61 in each fuel tank 1 are mutually standby). When the balance control module 4 controls the ship fuel supply system to execute the second action, the balance control module 4 controls the low-pressure fuel pumps 61 with shorter running time in the high-liquid-level fuel tanks 1 to be started, so that the running time difference between the low-pressure fuel pumps 61 is reduced, and the service life of equipment is prolonged.
Further, as shown in fig. 1, in the present embodiment, the balance control module 4 is further configured to control the ship fuel supply system to perform the following actions:
action five: when the ship fuel supply system is in the supply mode, if the low-pressure fuel pump 61 in the currently used fuel tank 1 fails, the balance control module 4 preferentially controls the other low-pressure fuel pump 61 in the currently used fuel tank 1 to be turned on (i.e., preferentially does not switch the supply of the fuel tank 1, i.e., preferentially uses the same fuel tank 1 for fuel supply); if the other low-pressure fuel pump 61 in the currently used fuel tank 1 fails to be normally turned on, the balance control module 4 controls the low-pressure fuel pump 61 in the other fuel tank 1 to be turned on for a smaller operation time.
Further, as shown in fig. 1, in the present embodiment, the number of BOG compressors 2 is two, two BOG compressors 2 are arranged in parallel, and two BOG compressors 2 are standby. The balance control module 4 is also used for controlling the ship fuel supply system to perform the following actions:
action six: when one BOG compressor 2 fails in operation, the balance control module 4 controls the other BOG compressor 2 to be turned on.
Further, in the present embodiment, the balance control module 4 preferentially controls the BOG compressor 2 having a smaller running time to be turned on when controlling the ship fuel supply system to perform the above-described action four.
Further, as shown in fig. 1, in the present embodiment, when the ship fuel supply system is in the fuel pump and compressor co-supply mode, if the BOG compressor 2 fails, the balance control module 4 controls the other BOG compressor 2 to be turned on, and simultaneously controls the low pressure fuel pump 61 to increase its operating frequency for a period of time; after the other BOG compressor 2 is smoothly started, the balance control module 4 controls the low-pressure fuel pump 61 again to resume its operating frequency, thereby reducing the influence of the supply pressure and the supply flow rate of the fuel during the switching process.
Further, as shown in fig. 1 and 2, in the present embodiment, the fuel pump assembly further includes a high-pressure fuel pump 62 provided between the low-pressure fuel pumps 61 in the two fuel tanks 1 and the fuel device 3, the high-pressure fuel pump 62 being for pressurizing the fuel, and the balance control module 4 being electrically connected to the high-pressure fuel pump 62. The number of high-pressure fuel pumps 62 is two, and the two high-pressure fuel pumps 62 are arranged in parallel. The balance control module 4 is also used for controlling the ship fuel supply system to perform the following actions:
action seven: when one of the high-pressure fuel pumps 62 fails in operation, the balance control module 4 controls the other high-pressure fuel pump 62 to be turned on.
Further, as shown in fig. 1 and 2, in the present embodiment, the ship fuel supply system further includes a first heat exchange system 7, and a fuel heating device 63 is further provided between the low-pressure fuel pumps 61 and the fuel devices 3 in the two fuel tanks 1, and the fuel heating device 63 is used for heating the fuel. The first heat exchanging system 7 is connected to the fuel heating device 63, and the first heat exchanging system 7 is used for heating the fuel heating device 63. The first heat exchange system 7 includes a heat source line 71, a first circulation pump 72 for circulating and transporting a heat exchange medium, and a heater 73 for exchanging heat with a heat source, a heat source regulating valve 711 is provided on the heat source line 71, the first circulation pump 72 is connected to the fuel heating device 63 and the heater 73, and the heater 73 is connected to the fuel heating device 63 and the heat source line 71, respectively.
The heat exchange medium is, for example, water/glycol, and the first circulation pump 72 is a water/glycol pump, and the heater 73 is a water/glycol heater. In the working process, the heat exchange medium circularly flows among the first circulating pump 72, the heater 73 and the fuel heating equipment 63, and the power of the heat exchange medium circularly flows is derived from the first circulating pump 72; the heat exchange medium can exchange heat with a heat source (such as cylinder liner hot water) in the heat source pipeline 71 in the heater 73, so that the heat exchange medium is heated; the warmed heat exchange medium exchanges heat with the low-temperature fuel in the fuel heating apparatus 63, thereby warming up the low-temperature fuel to satisfy the supply temperature of the fuel apparatus 3.
The balance control module 4 is electrically connected to the first circulation pumps 72 and the heat source adjustment valve 711, respectively, the number of the first circulation pumps 72 is two, and the two first circulation pumps 72 are arranged in parallel. The balance control module 4 is also used for controlling the ship fuel supply system to perform the following actions:
action eight: when one of the first circulation pumps 72 fails in operation, the balance control module 4 controls the heat source regulating valve 711 on the heat source pipeline 71 to increase the opening thereof, thereby temporarily increasing the flow rate of the heat source and controlling the other first circulation pump 72 to be opened; after the other first circulation pump 72 is smoothly turned on, the balance control module 4 adjusts the opening degree of the heat source adjustment valve 711 (decreases the opening degree of the heat source adjustment valve 711). Since the first circulation pump 72 causes fluctuation of the circulation flow rate of the heat exchange medium during the switching process (the circulation flow rate of the heat exchange medium is temporarily reduced), by increasing the flow rate of the heat source, the temperature of the heat exchange medium in a short time is increased to offset the shortage of heat caused by the reduction of the flow rate of the heat exchange medium during the switching process, and the supply temperature fluctuation of the fuel is ensured to satisfy the requirements of the fuel apparatus 3.
Further, as shown in fig. 1, in the present embodiment, the number of the heaters 73 and the heat source lines 71 is two, the two heaters 73 are arranged in series, and the two heaters 73 are connected to the two heat source lines 71, respectively. When the balance control module 4 controls the ship fuel supply system to perform the above-mentioned action eight, after one of the first circulation pumps 72 fails in operation, the balance control module 4 may also control the heat source adjusting valve 711 on the standby heat source pipeline 71 to be opened, that is, heat the heat exchange medium by using the two heaters 73 at the same time, so as to increase the temperature of the heat exchange medium in a short time, and reduce the temperature fluctuation.
Further, as shown in fig. 1, in the present embodiment, the fuel apparatus 3 includes a high-pressure fuel apparatus 32 and a low-pressure fuel apparatus 31, the high-pressure fuel apparatus 32 may be a marine main engine, the low-pressure fuel apparatus 31 may be a marine engine, a marine boiler, or the like. The fuel heating apparatus 63 includes a high-pressure carburetor 632 and a low-pressure carburetor 631, the high-pressure fuel pump 62 and the high-pressure carburetor 632 being disposed between the low-pressure fuel pump 61 and the high-pressure fuel apparatus 32, the low-pressure carburetor 631 being disposed between the low-pressure fuel pump 61 and the low-pressure fuel apparatus 31; the BOG compressor 2 is connected to a low pressure fuel apparatus 31 for supplying fuel to the low pressure fuel apparatus 31. In this case, the fuel may be LNG, and the high-pressure vaporizer 632 may vaporize the LNG into natural gas (when the fuel is liquid ammonia, the high-pressure vaporizer 632 may be replaced with a high-pressure heater because the liquid ammonia supply is required by the ship's main engine). The first heat exchanging system 7 is connected to the high pressure vaporizer 632 and the low pressure vaporizer 631, respectively, so as to heat the high pressure vaporizer 632 and the low pressure vaporizer 631.
Further, as shown in fig. 1 and 2, in the present embodiment, the ship fuel supply system further includes a second heat exchange system 8, a BOG preheater 21 is further disposed between the BOG compressor 2 and the two fuel tanks 1, and a BOG cooler 22 is further disposed between the BOG compressor 2 and the fuel device 3; the BOG preheater 21 is used to preheat BOG (because the BOG coming out of the fuel tank 1 has a low temperature, the BOG preheater 21 needs to be used for preheating first); BOG cooler 22 is used for cooling BOG compressed by BOG compressor 2 (BOG cooler 22 is required for cooling because BOG compressed by BOG compressor 2 has a high temperature, i.e. the outlet temperature of BOG compressor 2 is high).
The second heat exchange system 8 is respectively connected with the BOG preheater 21 and the BOG cooler 22, and the second heat exchange system 8 is used for heating the BOG preheater 21 and cooling the BOG cooler 22. The second heat exchange system 8 comprises a cold source pipeline 81, a second circulating pump 82 for circulating and conveying a heat exchange medium, and a heat exchange medium cooler 83 for exchanging heat with the cold source, wherein a cold source regulating valve 811 is arranged on the cold source pipeline 81, the second circulating pump 82 is respectively connected with the BOG preheater 21, the BOG cooler 22 and the heat exchange medium cooler 83, and the heat exchange medium cooler 83 is respectively connected with the cold source pipeline 81, the BOG preheater 21 and the BOG cooler 22.
The heat exchange medium is, for example, water/glycol, and the second circulation pump 82 is a water/glycol pump, and the heat exchange medium cooler 83 is a water/glycol heater. During operation, the heat exchange medium can circulate between the second circulation pump 82, the heat exchange medium cooler 83 and the BOG cooler 22, and between the second circulation pump 82, the heat exchange medium cooler 83 and the BOG preheater 21; the heat exchange medium is capable of exchanging heat with a cold source (e.g., low-temperature cooling water, the temperature of which is about 36 ℃) in the cold source line 81 in the heat exchange medium cooler 83, thereby cooling the heat exchange medium. The cooled heat exchange medium exchanges heat with the low-temperature BOG in the BOG preheater 21 so as to raise the temperature of the low-temperature BOG (the temperature of the heat exchange medium is higher than that of the low-temperature BOG because the temperature of the low-temperature BOG is very low, so that the low-temperature BOG can be raised by exchanging heat with the low-temperature BOG); the cooled heat exchange medium on the other hand exchanges heat with the high temperature BOG in BOG cooler 22, thereby cooling the high temperature BOG.
The balance control module 4 is electrically connected to the second circulation pump 82 and the cold source control valve 811. The number of the second circulation pumps 82 is two, and the two second circulation pumps 82 are arranged in parallel. The balance control module 4 is also used for controlling the ship fuel supply system to perform the following actions:
action nine: when one of the second circulation pumps 82 fails in operation, the balance control module 4 controls the cold source regulating valve 811 on the cold source pipeline 81 to increase the opening (for example, the opening of the cold source regulating valve 811 is adjusted to be fully opened), so as to temporarily increase the flow rate of the cold source, and controls the other second circulation pump 82 to be opened; after the other second circulation pump 82 is smoothly turned on, the balance control module 4 adjusts the opening degree of the cold source adjusting valve 811 (decreases the opening degree of the cold source adjusting valve 811). Since the second circulation pump 82 causes fluctuation of the circulation flow of the heat exchange medium (the circulation flow of the heat exchange medium is temporarily reduced) during the switching process, the insufficient cooling capacity caused by the reduction of the flow of the heat exchange medium during the switching process is counteracted by increasing the flow of the cooling source, so that the supply temperature fluctuation of the BOG is ensured to meet the requirement of the fuel device 3.
Further, as shown in fig. 1, in the present embodiment, the ship fuel supply system has a fuel pump supply mode (i.e., supply by pumping liquid fuel in the fuel tank 1 by the low-pressure fuel pump 61), a compressor supply mode (i.e., supply by compressing BOG in the fuel tank 1 by the BOG compressor 2), a fuel pump and compressor common supply mode (i.e., supply by both the low-pressure fuel pump 61 and the BOG compressor 2). The system database presets the operation parameters of different supply modes under different engine loads, the initial value of the operation parameters is given by an empirical value, and the operation parameters can be updated along with the data of the actual operation conditions.
The balance control module 4 is also used for controlling the ship fuel supply system to perform the following actions:
action ten: when the ship fuel supply system is switched from the fuel pump supply mode to the fuel pump and compressor common supply mode, the balance control module 4 preferentially controls the BOG compressor 2 with shorter running time to be started, and the BOG compressor 2 preferentially processes the fuel vapor in the fuel tank 1 with higher pressure;
when the ship fuel supply system is switched from the compressor supply mode to the fuel pump and compressor common supply mode, the balance control module 4 preferentially controls the low-pressure fuel pump 61 with lower running time in the fuel tank 1 with higher liquid level to be turned on;
when the ship fuel supply system is switched from the fuel pump and compressor common supply mode to the fuel pump supply mode, the balance control module 4 controls the frequency initial value of the low-pressure fuel pump 61 to a preset frequency parameter in the operating condition database.
Further, as shown in fig. 1 and 2, in the present embodiment, the ship fuel supply system further includes a return line 23, one end of the return line 23 is connected to the outlet line of the BOG compressor 2, the other end of the return line 23 is connected to the inlet line of the BOG compressor 2, and the return line 23 is used for partially returning the fuel vapor processed by the BOG compressor 2 to adjust the supply amount of the fuel vapor. The return pipeline 23 is provided with a return regulating valve 231, and the balance control module 4 is electrically connected with the return regulating valve 231; the balance control module 4 is also used for controlling the ship fuel supply system to perform the following actions:
Action eleven: when the ship fuel supply system is switched from the fuel pump and compressor common supply mode to the compressor supply mode, the balance control module 4 controls the return flow regulating valve 231 on the return flow line 23 to be closed so as to relieve the influence of the switching process on the supply pressure; the balance control module 4 then adjusts the opening degree of the return flow regulating valve 231 (specifically, increases the opening degree of the return flow regulating valve 231) to ensure that the supply pressure meets the requirement (during switching, resetting the opening degree of the return flow regulating valve 231 to 0 can offset the influence on the supply pressure during switching due to the instantaneous decrease in the flow rate of the low-pressure fuel pump 61).
Further, as shown in fig. 1 and 2, in the present embodiment, the pressure sensor 11 and the liquid level sensor 12 are disposed on both fuel tanks 1, the pressure sensor 11 is used for monitoring the pressure of the fuel tank 1, and the liquid level sensor 12 is used for monitoring the liquid level of the fuel tank 1. The pressure sensor 11 and the liquid level sensor 12 are electrically connected with the balance control module 4, so that the balance control module 4 can judge and make corresponding control actions according to the measured pressure value and the measured liquid level value.
Further, in the present embodiment, the outlet line of the BOG compressor 2, the outlet line of the low pressure fuel pump 61, the outlet line of the high pressure fuel pump 62, the outlet line of the first circulation pump 72, the outlet line of the second circulation pump 82, and the like are further provided with pressure transmitters (not shown), each of which is electrically connected to the balance control module 4. When the pressure transmitter at the outlet of the equipment is high or low, alarming and lasting for a period of time, the dynamic equipment is considered to be invalid.
Further, in this embodiment, each pipeline is further provided with a control valve (not shown), and the control valves are electrically connected to the balance control module 4.
Further, as shown in fig. 1, in this embodiment, the balance control module 4 may be updated by the control system based on the original system, without adding new temperature, pressure, liquid level, etc. instruments (i.e. the balance control module 4 may be added to the original control system by means of program update, etc., the balance control module 4 only needs to use the original control signal, without adding hardware devices). The control parameters of the balance control module 4 can be optimized on line according to the operation result of the actual operation process, and the operation effect of the system is continuously improved.
Further, as shown in fig. 1 and 2, the main working procedure of the ship fuel supply system according to the embodiment of the invention is as follows:
1. the balancing control module 4 may be used to monitor the level change of the fuel tank 1 during fueling. When the system detects that the liquid level difference between the two fuel tanks 1 is larger than a preset value, the balance control module 4 checks the current working condition of the system.
In the filling mode, the balance control module 4 controls the liquid phase filling valve 53 and the air return valve 54 of the high-liquid-level fuel tank 1 to be closed, so that the fuel filling liquid inlet pipeline 51 only fills the low-liquid-level fuel tank 1 with fuel; when the liquid level difference between the two fuel tanks 1 is smaller than the preset value, the balance control module 4 controls the closed liquid phase filling valve 53 and the air return valve 54 to be opened again.
In the supply mode, the rotational speed of the low-pressure fuel pump 61 in the low-level fuel tank 1 is PID-controlled from the supply pressureThe control is switched to be controlled by the balance control module 4, and the balance control module 4 controls the low-pressure fuel pump 61 in the low-level fuel tank 1 to uniformly reduce the operation frequency thereof until the low-pressure fuel pump 61 in the low-level fuel tank 1 stops operating, that is, the operation frequency of the low-pressure fuel pump 61 satisfies: f (t) =f 0 Kt, f (t) is the low-pressure fuel pump frequency, f 0 The initial value of frequency is set coefficient value k, and t is time. While the balance control module 4 controls the low-pressure fuel pump 61 of the high-level fuel tank 1 to be turned on for a smaller operation time, the initial operation frequency of the low-pressure fuel pump 61 in the high-level fuel tank 1 is the operation frequency of the low-pressure fuel pump 61 in the low-level fuel tank 1 before switching, and the rotation speed of the low-pressure fuel pump 61 is controlled by the supply pressure PID.
2. The balancing control module 4 may be used to monitor the pressure change of the fuel tank 1 during fueling. When the system detects that the pressure difference between the two tanks 1 exceeds a set value, the balance control module 4 checks the current operating conditions of the system.
In the filling mode, the balance control module 4 controls the air return valve 54 of the high-pressure fuel tank 1 to be opened, and controls the air return valve 54 of the low-pressure fuel tank 1 to be closed, so that the pressure of the high-pressure fuel tank 1 is reduced, and the pressure of the low-pressure fuel tank 1 is increased to reduce the pressure difference between the two; when the pressure difference between the two fuel tanks 1 is smaller than the set value, the closed return air valve 54 is controlled to be opened again.
In the feed mode, if no BOG compressor 2 is engaged in the fuel feed at this time; when the fuel device 3 is in a high-load supply condition with a load greater than or equal to 50%, the balance control module 4 controls the BOG compressor 2 with less running time to be started so as to treat fuel vapor in the high-pressure fuel tank 1; and when the pressure difference between the two fuel tanks 1 is smaller than the set value, controlling the BOG compressor 2 to be turned off. When the fuel device 3 is in a low-load supply condition with a load less than 50%, the balance control module 4 controls the air return valves 54 of the two fuel tanks 1 to be opened so that the two fuel tanks 1 are communicated through the fuel filling air return pipeline 52; when the pressure difference between the two fuel tanks 1 is smaller than the set value, the air return valves 54 of the two fuel tanks 1 are controlled to be closed. In the supply mode, if the BOG compressor 2 participates in the fuel supply at this time, the balance control module 4 does not need to operate, and the BOG compressor 2 automatically processes the high-pressure fuel tank 1 to the set pressure.
3. When the system detects that the control or safety system gives an alarm, namely the system moves equipment to fail, the equipment needs to be switched. The balance control module 4 performs pre-adjustment, and the failure of the dynamic equipment mainly comprises: low pressure fuel pump failure, compressor failure, high pressure fuel pump failure, and water/glycol pump failure. The failure of the system moving equipment is mainly realized by monitoring the outlet pressure transmitter of the equipment, and the moving equipment is considered to be failed after the high or low alarm of the outlet pressure transmitter is carried out for a period of time.
When the low-pressure fuel pump 61 fails, the balance control module 4 preferentially controls the other low-pressure fuel pump 61 in the same fuel tank 1 to be started, and the operation frequency initial value of the low-pressure fuel pump 61 is a preset frequency parameter in the working condition database. If the low-pressure fuel pump 61 is not normally turned on, the balance control module 4 controls the low-pressure fuel pump 61 of the other fuel tank 1 to be turned on for a smaller operation time.
When the BOG compressor 2 fails, the balance control module 4 preferentially controls the other BOG compressor 2 to be started. If the ship fuel supply system is in the fuel pump and compressor common supply mode at this time, the balance control module 4 also controls the low-pressure fuel pump 61 to increase its operating frequency for a while (the frequency-priority PID control supply pressure of the low-pressure fuel pump 61 is controlled so that its operating frequency increases for a short time); after the other BOG compressor 2 starts smoothly, the balance control module 4 controls the low-pressure fuel pump 61 again to resume its operating frequency.
When the high-pressure fuel pump 62 fails, the balance control module 4 preferentially controls the other high-pressure fuel pump 62 to be started, and the operating frequency initial value of the high-pressure fuel pump 62 is a preset frequency parameter in the working condition database.
When the first circulation pump 72 fails, the balance control module 4 preferentially controls the other first circulation pump 72 to be turned on. Since the first circulation pump 72 may cause fluctuation of the circulation flow of the heat exchange medium during the switching process, the balance control module 4 controls the heat source adjusting valve 711 on the heat source pipeline 71 to increase the opening degree thereof in advance, or controls the heat source adjusting valve 711 on the standby heat source pipeline 71 to be opened, thereby temporarily increasing the flow rate of the heat source, and ensuring that the supply temperature fluctuation of the fuel meets the requirement of the fuel device 3. After the other first circulation pump 72 is smoothly turned on, the opening degree of the heat source adjustment valve 711 is adjusted.
When the second circulation pump 82 fails, the balance control module 4 preferentially controls the other second circulation pump 82 to be turned on. Since the second circulation pump 82 may cause fluctuation of the circulation flow rate of the heat exchange medium during the switching process, the balance control module 4 controls the cold source adjusting valve 811 on the cold source pipeline 81 in advance to increase the opening degree thereof (for example, adjusts the cold source adjusting valve 811 to a fully open state), thereby ensuring that the supply temperature fluctuation of BOG meets the requirement of the fuel apparatus 3. After the other second circulation pump 82 is smoothly turned on, the opening degree of the cold source adjusting valve 811 is adjusted.
4. When the system detects that the type of the operation equipment is changed, namely the supply mode of the system is changed, the system adjusts according to the current supply quantity and preset frequency parameters in the matching database of the air supply equipment. Marine fuel delivery systems typically have a fuel pump delivery mode, a compressor delivery mode, a fuel pump and a compressor common delivery mode. The system database presets the operation parameters of different supply modes under different engine loads, the initial value of the operation parameters is given by an empirical value, and the operation parameters can be updated along with the data of the actual operation conditions.
When the ship fuel supply system is switched from the fuel pump supply mode to the fuel pump and compressor common supply mode, the balance control module 4 preferentially controls the BOG compressor 2 having a smaller running time to be turned on, and the BOG compressor 2 preferentially processes the fuel vapor in the fuel tank 1 having a larger pressure.
When the ship fuel supply system is switched from the compressor supply mode to the fuel pump and compressor co-supply mode, the balance control module 4 preferentially controls the low pressure fuel pump 61 and the high pressure fuel pump 62 on for a smaller running time in the higher level fuel tank 1.
When the ship fuel supply system is switched from the fuel pump and compressor common supply mode to the fuel pump supply mode, the balance control module 4 controls the frequency initial values of the low-pressure fuel pump 61 and the high-pressure fuel pump 62 to preset frequency parameters in the operating condition database.
When the ship fuel supply system is switched from the fuel pump and compressor common supply mode to the compressor supply mode, the balance control module 4 controls the return flow regulating valve 231 on the return flow line 23 to be closed (i.e., the opening degree is 0) so as to relieve the influence of the switching process on the supply pressure; the balance control module 4 then adjusts the opening of the return flow regulating valve 231 again to ensure that the supply pressure meets the requirements.
According to the ship fuel supply system provided by the embodiment of the invention, the balance control module 4 is arranged, and the balance control module 4 can automatically regulate and control the low-pressure fuel pump 61, the BOG compressor 2, the liquid phase filling valve 53 and the air return valve 54, so that the liquid level difference and the pressure difference of the two fuel tanks 1 during fuel filling and fuel supply are automatically regulated and controlled to be stable, original manual operation regulation and control are reduced or avoided, the burden of a crew is lightened, and the capability of the system for coping with sudden conditions is improved; meanwhile, the influence on the system supply pressure and supply temperature during the control of the equipment can be reduced as much as possible, and the stability of the system is improved. The ship fuel supply system has the advantages that:
1. The original working condition of manual operation is reduced, and the capability of the system for coping with emergency is improved. The balance control module 4 is adopted for automatic control, so that the working conditions of manual operation such as fuel tank liquid level difference, fuel tank pressure difference and the like can be reduced, and the burden of a crew is reduced.
2. The service life of the pump, the compressor and other equipment is prolonged. The balance control module 4 is used for intervening the sudden system condition, so that the influence of the switching process of the dynamic equipment on the system stability is reduced. The balance control module 4 can scientifically manage the running time of the equipment, reduce the running time difference of the movable equipment and improve the service life.
3. The fuel supply temperature and pressure are ensured to be stable. The balance control module 4 can be used for controlling the system in the working condition switching process, so that stable switching of the system between different working conditions is ensured, and the stability of the system is improved.
4. The balance control module 4 can be updated by the control system on the basis of the original system without adding new temperature, pressure, liquid level and other instruments (namely, the balance control module 4 can be added into the original control system in the form of program update and the like, and the balance control module 4 only needs to use the original control signal without adding hardware equipment). The control parameters of the balance control module 4 can be optimized on line according to the operation result of the actual operation process, and the operation effect of the system is continuously improved.
The marine fuel delivery system may be used not only for a single fuel delivery system, but also for a dual fuel delivery system or a delivery system of more fuels.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A marine fuel supply system, characterized by comprising two fuel tanks (1), a fuel pump assembly, a BOG compressor (2), a fuel device (3), a balance control module (4), a fueling-liquid inlet line (51) and a fueling-return line (52); the two fuel tanks (1) are respectively arranged on the port side and the starboard side of the ship; the fuel pump assembly comprises low-pressure fuel pumps (61) respectively arranged in two fuel tanks (1), and the low-pressure fuel pumps (61) in the two fuel tanks (1) are connected with the fuel equipment (3) so as to supply liquid fuel in the fuel tanks (1) to the fuel equipment (3); the BOG compressor (2) is respectively connected with the two fuel tanks (1) and the fuel equipment (3) so as to supply fuel evaporation gas in the fuel tanks (1) to the fuel equipment (3); the fuel filling liquid inlet pipeline (51) is connected with the fuel filling ports of the two fuel tanks (1) through liquid phase filling valves (53), and the fuel filling air return pipeline (52) is connected with the air return ports of the two fuel tanks (1) through air return valves (54); the balance control module (4) is respectively connected with the low-pressure fuel pump (61), the BOG compressor (2), the liquid phase filling valve (53) and the air return valve (54) in an electric signal mode, and the balance control module (4) is used for controlling the ship fuel supply system to execute the following actions:
Action one: when the ship fuel supply system is in a filling mode, if the liquid level difference between the two fuel tanks (1) exceeds a preset value, the balance control module (4) controls the liquid phase filling valve (53) and the air return valve (54) of the high-liquid-level fuel tank (1) to be closed, so that the fuel filling liquid inlet pipeline (51) only fills fuel into the low-liquid-level fuel tank (1); when the liquid level difference between the two fuel tanks (1) is smaller than the preset value, the balance control module (4) controls the closed liquid phase filling valve (53) and the air return valve (54) to be opened again;
action two: when the ship fuel supply system is in a supply mode, if the liquid level difference between the two fuel tanks (1) exceeds a preset value, the balance control module (4) controls the low-pressure fuel pump (61) in the low-liquid-level fuel tank (1) to uniformly reduce the operation frequency until the low-pressure fuel pump (61) in the low-liquid-level fuel tank (1) stops operating; simultaneously, the low-pressure fuel pump (61) in the high-liquid-level fuel tank (1) is controlled to be started, and the initial operating frequency of the low-pressure fuel pump (61) in the high-liquid-level fuel tank (1) is equal to the operating frequency of the low-pressure fuel pump (61) in the low-liquid-level fuel tank (1) before switching;
And action III: when the ship fuel supply system is in a filling mode, if the pressure difference between the two fuel tanks (1) exceeds a set value, the balance control module (4) controls the opening of a return air valve (54) of the high-pressure fuel tank (1) and controls the closing of the return air valve (54) of the low-pressure fuel tank (1); when the pressure difference between the two fuel tanks (1) is smaller than the set value, controlling the closed air return valve (54) to be opened again;
and action four: when the ship fuel supply system is in a supply mode, if the pressure difference between the two fuel tanks (1) exceeds a set value and the fuel equipment (3) is in a high-load supply working condition with a load of more than or equal to 50%, the balance control module (4) controls the BOG compressor (2) to be started so as to treat fuel vapor in the high-pressure fuel tanks (1); when the pressure difference between the two fuel tanks (1) is smaller than the set value, controlling the BOG compressor (2) to be closed;
if the pressure difference between the two fuel tanks (1) exceeds a set value and the fuel equipment (3) is in a low-load supply working condition with a load less than 50%, the balance control module (4) controls the air return valves (54) of the two fuel tanks (1) to be opened so as to enable the two fuel tanks (1) to be communicated through the fuel filling air return pipeline (52); and when the pressure difference between the two fuel tanks (1) is smaller than the set value, controlling the air return valves (54) of the two fuel tanks (1) to be closed.
2. Marine fuel supply system according to claim 1, wherein two low-pressure fuel pumps (61) arranged in parallel are provided in each of the fuel tanks (1); the balance control module (4) controls the low-pressure fuel pump (61) with less running time in the high-liquid-level fuel tank (1) to be started when controlling the ship fuel supply system to execute the second action.
3. Marine fuel supply system according to claim 1, wherein two low-pressure fuel pumps (61) arranged in parallel are provided in each of the fuel tanks (1); the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
action five: when the ship fuel supply system is in a supply mode, if the low-pressure fuel pump (61) in the currently used fuel tank (1) fails, the balance control module (4) preferentially controls the other low-pressure fuel pump (61) in the currently used fuel tank (1) to be opened; if the other low-pressure fuel pump (61) in the currently used fuel tank (1) is not normally started, the balance control module (4) controls the low-pressure fuel pump (61) with less running time in the other fuel tank (1) to be started.
4. Marine fuel supply system according to claim 1, wherein the number of BOG compressors (2) is two, two BOG compressors (2) being arranged in parallel; the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
action six: when one of the BOG compressors (2) fails in operation, the balance control module (4) controls the other BOG compressor (2) to be started.
5. A ship fuel supply system according to claim 4, characterized in that when the ship fuel supply system is in a fuel pump and compressor co-supply mode, if the BOG compressor (2) fails, the balance control module (4) controls the other BOG compressor (2) to be turned on, while controlling the low pressure fuel pump (61) to increase its operating frequency over a period of time; after the other BOG compressor (2) is started smoothly, the balance control module (4) controls the low-pressure fuel pump (61) to restore the running frequency.
6. Marine fuel supply system according to claim 1, wherein a high pressure fuel pump (62) is further provided between the low pressure fuel pumps (61) in both fuel tanks (1) and the fuel plant (3), the balance control module (4) being in electrical signal connection with the high pressure fuel pumps (62); the number of the high-pressure fuel pumps (62) is two, and the two high-pressure fuel pumps (62) are arranged in parallel; the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
Action seven: when one of the high-pressure fuel pumps (62) fails during operation, the balancing control module (4) controls the other high-pressure fuel pump (62) to be turned on.
7. Marine fuel supply system according to claim 1, further comprising a first heat exchanging system (7), a fuel heating device (63) being further arranged between the low pressure fuel pumps (61) in the two fuel tanks (1) and the fuel device (3), the first heat exchanging system (7) being connected to the fuel heating device (63), the first heat exchanging system (7) being adapted to heat the fuel heating device (63); the first heat exchange system (7) comprises a heat source pipeline (71), a first circulating pump (72) for circulating and conveying a heat exchange medium and a heater (73) for exchanging heat with a heat source, the heat source pipeline (71) is provided with a heat source regulating valve (711), the first circulating pump (72) is respectively connected with the fuel heating equipment (63) and the heater (73), and the heater (73) is respectively connected with the fuel heating equipment (63) and the heat source pipeline (71); the balance control module (4) is respectively connected with the first circulating pump (72) and the heat source regulating valve (711) in an electric signal manner; the number of the first circulating pumps (72) is two, and the two first circulating pumps (72) are arranged in parallel; the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
Action eight: when one of the first circulation pumps (72) fails in operation, the balance control module (4) controls a heat source regulating valve (711) on the heat source pipeline (71) to increase the opening degree of the heat source regulating valve, and controls the other first circulation pump (72) to be opened.
8. Marine fuel supply system according to claim 1, further comprising a second heat exchange system (8), a BOG preheater (21) being further arranged between the BOG compressor (2) and the two fuel tanks (1), a BOG cooler (22) being further arranged between the BOG compressor (2) and the fuel plant (3), the second heat exchange system (8) being connected to the BOG preheater (21) and the BOG cooler (22), respectively, the second heat exchange system (8) being adapted to heat the BOG preheater (21) and to cool the BOG cooler (22); the second heat exchange system (8) comprises a cold source pipeline (81), a second circulating pump (82) for circulating and conveying a heat exchange medium and a heat exchange medium cooler (83) for exchanging heat with a cold source, wherein a cold source regulating valve (811) is arranged on the cold source pipeline (81), the second circulating pump (82) is respectively connected with the BOG preheater (21), the BOG cooler (22) and the heat exchange medium cooler (83), and the heat exchange medium cooler (83) is respectively connected with the cold source pipeline (81), the BOG preheater (21) and the BOG cooler (22); the balance control module (4) is respectively connected with the second circulating pump (82) and the cold source regulating valve (811) in an electric signal manner; the number of the second circulating pumps (82) is two, and the two second circulating pumps (82) are arranged in parallel; the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
Action nine: when one of the second circulating pumps (82) fails in operation, the balance control module (4) controls a cold source regulating valve (811) on the cold source pipeline (81) to increase the opening degree of the cold source regulating valve, and controls the other second circulating pump (82) to be opened.
9. Marine fuel supply system according to claim 1, wherein the number of BOG compressors (2) is two, two BOG compressors (2) being arranged in parallel; the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
action ten: when the ship fuel supply system is switched from a fuel pump supply mode to a fuel pump and compressor common supply mode, the balance control module (4) preferentially controls the BOG compressor (2) with shorter running time to be started, and the BOG compressor (2) preferentially processes fuel vapor in the fuel tank (1) with higher pressure;
when the ship fuel supply system is switched from a compressor supply mode to a fuel pump and compressor common supply mode, the balance control module (4) preferentially controls the low-pressure fuel pump (61) with a higher liquid level and a lower running time in the fuel tank (1) to be started.
10. A ship fuel supply system according to any one of claims 1-9, characterized in that the ship fuel supply system further comprises a return line (23), one end of the return line (23) being connected to the outlet line of the BOG compressor (2), the other end of the return line (23) being connected to the inlet line of the BOG compressor (2), the return line (23) being adapted to partially return the fuel vapor after treatment by the BOG compressor (2) for regulating the supply of fuel vapor; the return pipeline (23) is provided with a return regulating valve (231), and the balance control module (4) is electrically connected with the return regulating valve (231); the balance control module (4) is also used for controlling the ship fuel supply system to execute the following actions:
Action eleven: when the ship fuel supply system is switched from a fuel pump and compressor common supply mode to a compressor supply mode, the balance control module (4) controls a return flow regulating valve (231) on the return line (23) to be closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311206798.0A CN117262186A (en) | 2023-09-18 | 2023-09-18 | Ship fuel supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311206798.0A CN117262186A (en) | 2023-09-18 | 2023-09-18 | Ship fuel supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117262186A true CN117262186A (en) | 2023-12-22 |
Family
ID=89201986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311206798.0A Pending CN117262186A (en) | 2023-09-18 | 2023-09-18 | Ship fuel supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117262186A (en) |
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2023
- 2023-09-18 CN CN202311206798.0A patent/CN117262186A/en active Pending
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