CN112031967B - Fuel supply equipment and supply method for offshore platform - Google Patents
Fuel supply equipment and supply method for offshore platform Download PDFInfo
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- CN112031967B CN112031967B CN202010721071.6A CN202010721071A CN112031967B CN 112031967 B CN112031967 B CN 112031967B CN 202010721071 A CN202010721071 A CN 202010721071A CN 112031967 B CN112031967 B CN 112031967B
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- fuel
- pressurizing
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- 239000000446 fuel Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims description 16
- 239000010779 crude oil Substances 0.000 claims abstract description 98
- 230000001105 regulatory effect Effects 0.000 claims abstract description 54
- 239000000295 fuel oil Substances 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 80
- 239000002283 diesel fuel Substances 0.000 claims description 42
- 238000004140 cleaning Methods 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 32
- 238000005259 measurement Methods 0.000 claims description 8
- 239000010705 motor oil Substances 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000010926 purge Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000010230 functional analysis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
- F02M31/125—Fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The fuel supply equipment for the offshore platform comprises a diesel pressurizing module, a fuel pressurizing module and a circulating module, wherein the diesel pressurizing module comprises a diesel pressure regulating pipeline and a diesel pressurizing pipeline which are arranged in parallel, a diesel pressure regulating valve group is arranged on the diesel pressure regulating pipeline, a diesel pressurizing pump group is arranged on the diesel pressurizing pipeline, one ends of the diesel pressure regulating pipeline and the diesel pressurizing pipeline are communicated with an external diesel daily cabinet, and the other ends of the diesel pressure regulating pipeline and the diesel pressurizing pipeline are communicated with the circulating module; the fuel pressurizing module comprises a diesel crude oil switching valve, a fuel filtering pipeline, a fuel pressure regulating pipeline and a fuel pressurizing pipeline which are arranged in parallel, and the input end of the diesel crude oil switching valve is respectively communicated with an external diesel daily cabinet and an external fuel daily cabinet through a one-way valve. The device can supply fuel oil with proper temperature, pressure and viscosity for the offshore drilling platform generator set, and well meets the use conditions of explosion prevention, high automation and high flexibility of the offshore platform application environment.
Description
Technical Field
The invention relates to the technical field of offshore oil supply, in particular to fuel oil supply equipment for an offshore platform, and also relates to a supply method of the fuel oil supply equipment for the offshore platform.
Background
Currently, the manufacturers of marine fuel supply units in China are relatively more, the technology is relatively mature, the marine fuel supply units integrate functions of pressurization, heating/cooling, filtering and the like, fuel is pumped out of a daily fuel tank, and the fuel is subjected to pressurization, filtering, mixing and heating/cooling treatment in sequence so as to achieve the use conditions of main and auxiliary machines of the ships; the marine fuel supply unit has the advantages of high integration level, small occupied space and multiple fuel switching.
The harsh environment of offshore platforms (inflammable and explosive nature of high-concentration oil and gas, corrosiveness of sea wind with high salt concentration) puts severe technical requirements on fuel supply equipment: the equipment and the control system are subjected to explosion-proof design, high in corrosion resistance, high in automation level, high in reliability, high in flexibility and the like; because of the safe and stable environment of the cabin, the marine fuel supply unit does not have the capabilities of explosion prevention, corrosion prevention, emergency treatment and the like, and the fuel supply unit has high equipment integration level and low equipment flexibility, so that the marine fuel supply unit cannot meet the requirement of supplying oil to an offshore platform.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the fuel supply equipment for the offshore drilling platform, which can supply fuel with proper temperature, pressure and viscosity for the offshore drilling platform generator set according to the current working condition and has the advantages of high flexibility, safety and reliability.
Another technical problem to be solved by the present invention is to provide a supply method of the fuel supply apparatus for offshore platform.
The technical problems to be solved by the invention are realized by the following technical proposal. The invention relates to fuel supply equipment for an offshore platform, which comprises a diesel pressurizing module, a fuel pressurizing module and a circulating module, wherein the diesel pressurizing module comprises a diesel pressure regulating pipeline and a diesel pressurizing pipeline which are arranged in parallel, a diesel pressure regulating valve group is arranged on the diesel pressure regulating pipeline, a diesel pressurizing pump group is arranged on the diesel pressurizing pipeline, one ends of the diesel pressure regulating pipeline and the diesel pressurizing pipeline are communicated with an external diesel daily cabinet, and the other ends of the diesel pressure regulating pipeline and the diesel pressurizing pipeline are communicated with the circulating module;
the fuel pressurizing module comprises a diesel crude oil switching valve, a fuel filtering pipeline, a fuel pressure regulating pipeline and a fuel pressurizing pipeline which are arranged in parallel, wherein a fuel pressure regulating valve group is arranged on the fuel pressure regulating pipeline, and a fuel pressurizing pump group is arranged on the fuel pressurizing pipeline; the input ends of the diesel oil crude oil switching valve are respectively communicated with an external diesel oil daily cabinet and an external fuel oil daily cabinet through one-way valves, one ends of a fuel oil pressure regulating pipeline and a fuel oil pressurizing pipeline are communicated with the output end of the diesel oil crude oil switching valve, the other ends of the fuel oil pressure regulating pipeline and the fuel oil pressurizing pipeline are communicated with a fuel oil cleaning pipeline, and the other ends of the fuel oil cleaning pipeline are communicated with a circulation module;
the circulation module comprises a circulation module 1 and a circulation module 2, wherein the circulation module 1 and the circulation module 2 comprise circulation pipelines, the circulation pipelines are sequentially connected with a diesel skid and crude oil skid switching valve, a mixing tank, a fuel circulation pump group, a heater group and a viscosity measurement module, the input ends of the circulation pipelines of the circulation module 1 and the circulation module 2 are communicated with a diesel pressurizing module and a fuel pressurizing module, and the output ends of the circulation pipelines of the circulation module 1 and the circulation module 2 are respectively communicated with external different crude oil generators.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the fuel supply equipment for the offshore platform, a normal emergency switching valve is also arranged at the output end of the circulating pipeline, and the switching output end of the normal emergency switching valve is communicated with the communication position of the input end of the circulating pipeline and the diesel pressurizing module.
The technical problem to be solved by the invention can be further solved by the following technical scheme, for the fuel supply equipment for the offshore platform, an oil return pipeline is further arranged at the output end of the circulating pipeline, an oil return pressure regulating valve group, a cooler and an oil drum and oil tank switching valve are arranged on the oil return pipeline, the oil drum output end of the oil drum and oil tank switching valve is communicated with a mixing drum, the oil tank output end of the oil drum and oil tank switching valve is connected with a diesel oil switching valve, the diesel oil output end of the diesel oil switching valve is communicated with an external diesel oil daily tank, and the crude oil output end of the diesel oil switching valve is communicated with the external crude oil daily tank.
The technical problem to be solved by the invention can be further solved by the following technical scheme, for the fuel supply equipment for the offshore platform, a plurality of heaters which are connected in series or in parallel are connected in series on the heater group, a bypass switch is connected in parallel on each heater, a safety valve is also arranged on each heater, a discharge valve is arranged at an inlet and an outlet of each heater, and a thermometer is arranged on an inlet and an outlet pipeline of each heater group.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the fuel supply equipment for the offshore platform, the diesel pressure regulating valve group and the crude oil pressure regulating valve group are composed of two pressure regulating valves which are connected in parallel.
The technical problem to be solved by the invention can be further solved by the following technical scheme, for the fuel supply equipment for offshore platforms, the diesel booster pump set comprises two diesel booster pumps which are arranged in parallel, and the crude booster pump set comprises two crude booster pumps which are arranged in parallel.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the fuel supply equipment for the offshore platform, the fuel cleaning and filtering pipeline is a pipeline formed by connecting a self-cleaning filter and a bypass filter in parallel.
The technical problem to be solved by the invention can be further solved by the following technical scheme, and for the fuel supply equipment for the offshore platform, the fuel supply method for the offshore platform comprises manual, semi-automatic and full-automatic working modes, wherein the full-automatic working modes comprise the following working modes:
(1) Cold car starting operation mode
In the state of the host machine for standby, the fuel oil is supplied to the host machine by utilizing the mode that the diesel pressurizing module and the circulating module corresponding to the host machine jointly operate, the diesel pressurizing module pressurizing pump pumps the diesel oil in the diesel oil daily cabinet and carries out primary pressurizing, the inlet of the circulating module is positioned at the diesel oil interface position, the diesel oil is subjected to secondary pressurizing through the circulating pump after passing through the oil mixing barrel, the diesel oil circulates between the circulating module and the host machine, and the host machine returns oil to the oil mixing barrel after being cooled by the plate;
(2) Automatic diesel oil-to-crude oil running mode
The method comprises the steps that a host is started in a cold-car mode and then carries a load, the load reaches a mode of converting the load into crude oil, the mode of converting the crude oil is that a fuel pressurizing module and the host are combined to operate corresponding to a circulating module, the diesel pressurizing module is stopped after the crude oil enters the crude oil mode, an inlet of the fuel pressurizing module is arranged on the crude oil side, a crude oil pressurizing pump pumps crude oil in a crude oil daily cabinet and carries out primary pressurizing, an inlet of the fuel circulating module is arranged at a crude oil interface position, the crude oil is subjected to secondary pressurizing through a circulating pump after passing through a mixing oil tank, the crude oil circulates between the circulating module and the host, meanwhile, the crude oil is heated by an electric heater according to the viscosity of the crude oil, and return oil of the host is cooled through a cooler and then enters the mixing oil tank;
(3) Diesel oil large cleaning mode
In the crude oil mode, the host operates normally with load, and in the large cleaning mode, the inlet of the fuel pressurizing module is turned to the diesel side, the booster pump of the fuel pressurizing module pumps diesel in the diesel daily cabinet, and the diesel passes through the circulating module and enters the host for consumption; the fuel flow pipeline is the same as the crude oil mode, but the fuel viscosity is detected in the circulation module to determine whether the return oil of the host can pass through the cooler;
(4) Diesel small cleaning mode
The diesel pressurizing module is utilized to clean the circulating module, so that crude oil in the circulating module is consumed;
(5) Normal system shutdown mode
Stopping the operation of the circulating pump in the circulating module, and simultaneously stopping the pressurizing module which is operated in combination with the circulating pump on the premise of not influencing the working condition of the other circulating module, wherein all valves in the circulating module and the stopped pressurizing module recover to the initial positions;
(6) Emergency mode 1
The emergency mode 1 cannot be selected on the circulation module, and is only jumped into after a specific fault occurs in a certain mode; the general condition is that the circulation module and the fuel pressurizing module are operated in a certain mode in a combined mode, the fuel pressurizing module fails and alarms to enter an emergency mode 1, the working condition of the emergency mode 1 is the same as that of a cold car mode and a small cleaning mode, and the mode mainly ensures the oil supply of a host under the condition of the failure of a crude oil module;
(7) Emergency mode 2
The emergency mode 2 is to jump to enter when the circulation module fails, or to select to enter on the circulation module, and any mode can be selected to directly enter the emergency mode 2; the emergency mode 2 mainly uses the diesel pressurizing module as a sole power source to build pressure, and supplies oil to the main engine through a large bypass in the circulating module; the inlet of the circulation module is positioned at the diesel side, the outlet valve is changed from a normal position to an emergency position, and the main engine oil return is returned to the crude oil daily cabinet after being cooled by the plate without returning to the oil mixing barrel;
(8) Universal automatic start-stop mode for fuel pressurizing module, diesel pressurizing module and fuel circulating module
The corresponding booster pump or circulating pump is operated in each mode, the pump set is in a standby state, the working pump is used for pressure establishment for 30s at first, if the working pump is not established and is converted into the standby pump for operation, if the working pump is still not established after 30s, the working of the module is stopped and a fault alarm is given; if the pressurizing module and the circulating module both build pressure, a corresponding mode can be entered; if the working pump pressure is reduced to the standard after the mode is entered, the pressure is switched to the standby pump after the pressure is not reestablished within 5s, and the standby pump builds the pressure according to the old 30 s.
Compared with the prior art, the invention has the beneficial effects that:
(1) The equipment has high working flexibility and has three working modes of manual operation, semi-automatic operation and full-automatic operation;
(2) The self-adaptive adjustment of the fuel switching speed automatically adjusts the time of the fuel switching valve according to the temperature and viscosity states of the fuel, so that the fuel switching is realized as soon as possible, and the problem of fuel emulsification and blockage is avoided;
(3) The modularized structural design provides sufficient space for the disassembly, maintenance and the maintenance of the manual execution part and parts of the equipment;
(4) The control system with simple operation can realize the operation of the whole fuel supply skid system by only pressing a plurality of buttons in a full-automatic mode, and is simple, convenient and easy to operate;
(5) The safety is high: the emergency mode 1 and the emergency mode 2 are guaranteed in an automatic mode, in addition, a semi-automatic mode and a manual mode are provided, the reliability of the whole system is improved layer by layer, and the safe and reliable operation of the fuel supply equipment for the offshore platform is guaranteed.
Drawings
FIG. 1 is a structural diagram of the present invention;
FIG. 2 is a structural connection diagram of the present invention;
FIG. 3 is a schematic diagram of a system of the present invention;
FIG. 4 is a system schematic diagram of a diesel boost module of the present invention;
FIG. 5 is a schematic system diagram of a fuel pressurization module of the present invention;
FIG. 6 is a schematic diagram of a system of the circulation module of the present invention;
FIG. 7 is a flow chart of a process for a cold start mode of the present invention;
FIG. 8 is a flow chart of the process of the invention for automatically switching diesel fuel to crude oil mode;
FIG. 9 is a flow chart of a routine for a large diesel purge mode of the present invention;
FIG. 10 is a flow chart of a routine for the diesel small purge mode of the present invention;
FIG. 11 is a program flow diagram of a normal system shutdown mode of the present invention;
FIG. 12 is a flow chart of the emergency mode 1 procedure of the present invention;
fig. 13 is a flowchart of the procedure of the emergency mode 2 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, a fuel supply apparatus for offshore platforms comprises a diesel pressurizing module, a fuel pressurizing module, and circulation modules 1, 2, wherein the diesel pressurizing module and the fuel pressurizing module are on a supply side, and the circulation modules 1, 2 are on a pressurizing side;
(1) Referring to fig. 4, the diesel boost module:
the outlet of the diesel daily cabinet is connected with the inlet of the diesel pressurizing module, the inlet of the module is connected with the duplex filter through a manual ball valve, a pressure gauge valve and a pressure gauge are arranged on a connecting pipeline, the outlet of the duplex filter is connected with the diesel pressurizing pump set, the two pumps are in parallel connection, the two pumps are redundant, and the inlet of the pump is provided with the manual ball valve. The outlets of the two diesel booster pumps are one-way valves, the two diesel booster pumps are connected with a manual ball valve, an instrument pipeline is led out of the outlet pipeline after being connected in parallel, the outlet pipeline is connected to a pressure gauge valve and a pressure gauge of an instrument panel, and the instrument pipeline is branched and connected to a pressure switch of the instrument panel; the pipeline after the parallel connection is completed is respectively communicated with two paths, one path of the pipeline enters the pressure regulating valve group, the purpose of pressure limiting is achieved, the pipeline formed by the two pressure regulating valves in parallel connection is reserved for each other, the inlet and the outlet of each pressure regulating valve are respectively provided with a manual ball valve, when the oil pumping pressure is larger than a set value, the pressure regulating valve is opened, the fuel returns to the diesel daily cabinet, the purpose of reducing the pressure is achieved, and when the pressure is recovered to be normal, the pressure regulating valve is automatically closed; the other path reaches the module outlet through a manual ball valve, and a pressure gauge valve, a pressure gauge and a pressure sensor are arranged on an outlet pipeline.
(2) Referring to fig. 5, the fuel boost module:
the fuel pressurizing module is provided with two inlets which are respectively connected with the diesel daily cabinet and the crude oil daily cabinet, and the inlets are respectively connected with the manual ball valve and then connected with the pneumatic switching valve, namely the diesel oil/crude oil switching valve, and the two inlets of the pneumatic switching valve are respectively provided with one-way valves to prevent cross mixing pollution of diesel oil and crude oil; the valve outlet is connected to the duplex filter, and the pipeline is provided with a pressure gauge valve and a pressure gauge. The outlet of the duplex filter is connected with the crude oil booster pump group, the two pumps are in parallel connection and are redundant, the inlet of the pump is provided with a manual ball valve, the outlets of the two diesel oil booster pumps are one-way valves, the two diesel oil booster pumps are connected with the manual ball valve, the parallel connected outlet pipeline is connected with the meter pipeline, the meter pipeline is connected with the pressure meter valve and the pressure meter of the instrument panel, and the branch of the meter pipeline is connected with the pressure switch of the instrument panel; the pipeline after the parallel connection is changed into two paths from a tee joint, one path of the pipeline is connected to the pressure regulating valve group, the pressure regulating valve group pipeline is a pipeline formed by two parallel pressure regulating valves, the inlet and the outlet of each pressure regulating valve are respectively provided with a manual ball valve, each pressure regulating valve is provided with a bypass pipeline, the pipeline is provided with the manual ball valve, and the outlet of the pipeline of the pressure regulating valve group is connected back to the inlet of the crude oil booster pump; the other pipeline enters a self-cleaning filter or a bypass filter which are connected in parallel, fuel oil is selected to pass through the self-cleaning filter and the bypass filter through a combined three-way valve, the fuel oil is selected to be communicated with the self-cleaning filter in the normal working process, the pressure difference alarming and automatic cleaning functions are achieved, and when the self-cleaning filter fails, the bypass filter is communicated. The outlet pipeline of the module is communicated with an instrument pipeline and is connected to a pressure meter valve and a pressure meter of an instrument panel, and meanwhile, the branch of the instrument pipeline is connected with a pressure sensor; the pneumatic switching valve is used for driving the fuel switching valve by introducing 7 kg of compressed air, and an electric valve can not be used as the module is in an explosion-proof area, so that a safe explosion-proof pneumatic valve is selected; and 4 kg of nitrogen is introduced into the self-cleaning filter for backwashing in the same explosion-proof requirement, so that the risk of contact combustion of crude oil and air caused by electric sparks is avoided.
(3) Referring to fig. 6, the circulation module:
the circulation module is provided with two inlets which are respectively connected with an outlet of the diesel pressurizing module and an outlet of the fuel pressurizing module, and the inlets are respectively connected with a manual ball valve and then to a pneumatic switching valve, namely a diesel skid/crude oil skid switching valve, and the two inlets of the pneumatic switching valve are respectively provided with a one-way valve; the pipeline of the flowmeter is arranged next, the inlet and the outlet of the flowmeter are provided with manual ball valves, and meanwhile, the flowmeter is provided with a bypass pipeline, and the pipeline is provided with the manual ball valves. The fuel enters the oil mixing barrel after passing through the pipe system, a temperature sensor is arranged at the inlet of the oil mixing barrel to monitor the temperature of the fuel pumped from the oil bin, and a pressure meter and a temperature sensor are arranged on the barrel body to monitor the temperature and the pressure of the mixed fuel. The top of the oil mixing barrel is provided with a liquid level switch and a mechanical exhaust device, a manual ball valve is arranged at the inlet and the outlet of the oil mixing barrel, a bypass pipeline is arranged at the same time, the ball valve is arranged, and the outlet of the exhaust device is connected to a crude oil daily cabinet; the safety valve is arranged on the outlet pipeline of the oil mixing barrel, the bottom of the oil mixing barrel is provided with a discharge pipeline, and the discharge and safety valve outlets are connected to the oil collecting tank. The outlet of the oil mixing barrel is connected to the fuel circulating pump set, the two pumps are in parallel connection state and are redundant, and the inlet of the pump is provided with a manual ball valve and a Y-shaped filter; the outlets of the two fuel circulating pumps are one-way valves, the rear ends of the two fuel circulating pumps are connected with manual ball valves, the pipeline outlet instrument pipelines which are connected in parallel are connected to the pressure meter valve and the pressure meter of the instrument panel, the pipeline branches of the instrument are connected to the pressure difference switch of the instrument panel, and the pipeline branches of the pump outlet instrument are connected with the pressure sensor; then the electric heater group is entered, the two electric heaters are connected in series and are simultaneously provided with a bypass pipeline, each electric heater inlet and outlet is provided with a manual ball valve, meanwhile, the inlet and outlet of the bypass pipeline are provided with manual ball valves, and the single-heater passing, the double-heater serial passing and the bypass pipeline passing are realized through the switch of the ball valves; each heater body is provided with a safety valve, each heater inlet and outlet is provided with a relief valve, and the inlet and outlet pipelines of the heater group are provided with a thermometer; the outlet of the heater group is connected with a viscosity measurement module, the viscosity measurement module mainly consists of a viscometer and a measurement flange, a manual ball valve is arranged at the inlet and the outlet of the viscosity measurement module, a bypass pipeline is arranged at the same time, and the manual ball valve is arranged on the pipeline; the outlet of the viscosity measurement module is connected to one inlet of the pneumatic switching valve, the valve is a switching valve of a normal pipeline or an emergency pipeline, and the viscosity measurement module is connected to the normal pipeline side; the emergency pipeline side is communicated with a fuel circulation skid diesel oil inlet branch, and a manual ball valve is arranged on the branch, so that the branch is called as a large bypass of fuel supply equipment; the outlet of the pneumatic switching valve is connected with the prying block outlet duplex filter, the outlet of the duplex filter is connected with the prying block outlet through the manual ball valve, the front outlet of the outlet is connected with a pressure gauge valve and a pressure gauge of an instrument panel through a meter pipeline, and meanwhile, the meter pipeline is branched and connected with a pressure sensor; the outlet of the normal pipeline/emergency pipeline switching valve is connected to the main engine oil return pipeline in a branched way on the duplex filter pipeline from the outlet of the prying block outlet, and the main engine oil return pipeline reach the oil return pressure regulating valve together, a manual ball valve is arranged at the inlet and the outlet of the pressure regulating valve, the outlet of the pressure regulating valve is connected to a pneumatic switching valve, and the pneumatic switching valve is a bypass pipeline switching valve of the plate cooler; the three-way valve is selectively introduced into a plate cooler or a cooler bypass pipeline, wherein the plate cooler is a plate cooler, and the bypass consists of a pressure regulating valve and a manual ball valve at the inlet and the outlet of the pressure regulating valve; butterfly valves are respectively arranged at the inlet and the outlet of the cold side of the plate cooler, a discharge pipeline and a thermometer are respectively arranged at the oil inlet and outlet pipeline, the outlet of the plate cold oil and the outlet of the bypass pipeline of the cooler are converged and communicated to a pneumatic switching valve, and the valve is an oil return to oil mixing barrel or an oil return to daily cabinet selection valve; the back mixing oil drum directly returns to the oil mixing drum through a one-way valve, if the back mixing oil drum returns to the daily cabinet, the pipeline is led to a pressure regulating valve of the daily cabinet, and the inlet and the outlet of the pressure regulating valve are provided with manual ball valves; the outlet of the pressure regulating valve is connected with the inlet of the manual three-way valve, and the valve can select whether to return the oil to the daily-use cabinet or the crude oil daily-use cabinet if the oil returns to the daily-use cabinet.
1. The working mode of the application:
because the offshore use environment has very severe requirements on the reliability and safety of the equipment, when the control system is designed, various working conditions need to be considered, and therefore, the fuel supply equipment also needs to have various working modes, and three main types of manual modes, semi-automatic modes and full-automatic modes mainly exist; the full-automatic mode comprises the following eight working modes:
(1) Referring to fig. 7, cold start mode of operation:
in the state of the host machine for standby, fuel is supplied to the host machine by utilizing a mode that the diesel pressurizing module and the corresponding fuel circulation module of the host machine are operated in a combined mode; the diesel pressurizing module pressurizing pump pumps diesel in the diesel daily cabinet and carries out primary pressurizing, the inlet of the fuel circulating module is positioned at the diesel position, the diesel is subjected to secondary pressurizing through the circulating pump after passing through the oil mixing barrel, and the diesel circulates between the circulating module and the host; and returning oil of the main engine to the oil mixing barrel after cooling the main engine.
(2) Referring to fig. 8, the diesel auto-change crude oil mode of operation:
the host is started in the cold-car mode and then brings a load, the load reaches a back-to-crude oil mode, the crude oil mode is the combined operation of the fuel pressurizing module and the corresponding circulating module of the host, and the diesel pressurizing module is stopped after the crude oil mode is entered. The inlet of the fuel pressurizing module is arranged on the side of crude oil, the crude oil pressurizing pump is used for pumping and pressurizing the crude oil in the crude oil daily cabinet to a first level, the inlet of the fuel circulating module is arranged at the position of the crude oil, the crude oil passes through the oil mixing barrel and is pressurized to a second level through the circulating pump, the crude oil circulates between the circulating module and the host, meanwhile, the crude oil is heated by the electric heater according to the viscosity of the crude oil, and the oil returned from the host passes through the bypass pipeline of the cooler and then reaches the oil mixing barrel.
Large cleaning of diesel oil
(3) Referring to fig. 9, diesel large purge mode:
in the crude oil mode, the host operates normally with load; the large cleaning mode is to transfer the inlet of the fuel pressurizing module to the diesel side, the booster pump of the fuel pressurizing module pumps diesel in the diesel daily cabinet, and the diesel is consumed by the circulating module and the main machine, so that crude oil in the system is consumed, and the purposes of cleaning the fuel pressurizing module and the crude oil in the circulating module are achieved; the fuel flow line is the same as the crude oil mode, except that the fuel viscosity is detected in the circulation module to determine whether the return oil of the host can pass through the plate cooler.
(4) Referring to fig. 10, diesel small purge mode:
if both circulation modules work in the crude oil mode, the circulation module needs to enter a large cleaning mode, and the fuel pressurizing module and the other circulation module work in the crude oil mode and can not be converted into diesel oil, so that the circulation module can jump to a small cleaning mode when turning to the large cleaning mode (meanwhile, the circulation module can be manually turned to the small cleaning mode in the crude oil mode); the working condition of the small cleaning mode is the same as that of the cold car mode and the emergency mode 1, and the diesel supercharging module is used for cleaning the circulation module, so that crude oil in the circulation module is consumed.
(5) Referring to fig. 11, normal system shutdown mode:
the operation of the circulating pump in the circulating module is stopped, and meanwhile, the pressurizing module which is operated in a combined way is stopped on the premise of not influencing the working condition of the other circulating module; all valves in the circulation module and the stopped pressurizing module recover to the initial positions.
(6) Referring to fig. 12, emergency mode 1 (diesel boost module-circulation module oil supply)
The emergency mode 1 cannot be selected on the circulation module, and is only jumped into after a specific fault occurs in a certain mode; the general situation is that the circulation module and the fuel pressurizing module are operated in a certain mode in a combined mode, and an alarm (generally, the pressure of the crude oil pressurizing pump cannot be established) of the failure of the fuel pressurizing module can enter an emergency mode 1, wherein the working condition of the emergency mode 1 is the same as that of a cold car mode and a small cleaning mode. This mode is mainly to ensure host oil supply in case of failure of the crude oil module.
(7) Referring to FIG. 13, emergency mode 2 (Diesel boost module direct supply host)
The emergency mode 2 is jumped to enter when the circulation module fails (generally, the pressure of the circulation pump of the fuel circulation module cannot be established), or the emergency mode 2 can be selected to enter directly in any mode; the emergency mode 2 mainly uses the diesel pressurizing module as the only power source to establish pressure, and supplies oil to the host through a large bypass (the diesel pressurizing module directly reaches the outlet of the circulating module through a pipeline after entering the circulating module, which is equivalent to bypassing the whole circulating module); the inlet of the circulation module is positioned at the diesel side, and meanwhile, the outlet valve is changed from a normal position to an emergency position, and the main engine oil return is returned to the crude oil daily cabinet after being cooled by the plate without returning to the oil mixing tank.
(8) Universal automatic start-stop mode for fuel pressurizing module, diesel pressurizing module and fuel circulating module
The corresponding booster pump or circulating pump is operated in each mode, the pump set is in a standby state, the working pump is used for pressure establishment for 30s at first, if the working pump is not established and is converted into the standby pump to operate, if the working pump is still not established after 30s, the working of the module is stopped and a fault alarm is reported (the standard basis for pressure establishment is a pressure or pressure difference switch); if the pressurizing module and the circulating module both build pressure, a corresponding mode can be entered. If the working pump pressure is reduced to the standard after the mode is entered, the pressure is switched to the standby pump after the pressure is not reestablished within 5s, and the standby pump builds the pressure according to the old 30 s.
2. The invention of this application is essential:
(1) Electrical integration and control of fuel supply equipment for offshore platform
The control system determines the level of automation of the fuel supply equipment and, due to the dangers of the equipment operating area, places high demands on the electrical design of the control system. According to the function of the fuel supply device: the fuel pressurizing module supplies fuel, automatically switches a fuel pump, automatically filters, alarms the pressure difference and alarms faults; the diesel pressurizing module supplies diesel oil, the diesel pump is automatically switched, the pressure difference is alarmed, and the fault is alarmed; the circulation module is used for automatically switching the circulation pump, alarming the pressure difference, controlling the viscosity and the temperature, controlling the heating power of the heater, alarming faults, alarming the liquid level, automatically exhausting air, smoothly controlling the pneumatic valve and the like.
(2) Modular structure and electrical design technique
In terms of structure, as the working principles of the oil supply equipment are nearly the same, in order to improve the mobility and flexibility of the equipment, the fuel oil supply conditions under different conditions are met (only crude oil is adopted to reduce the cost during normal operation, and all other starting, stopping and emergency use of diesel oil); therefore, in designing, it is necessary to design in combination with the functions and structures of the modules, thereby improving the functionality and flexibility of the modules.
The electrical modularized design mainly reduces the complexity of a control system, and is respectively carried out by combining the working modes of fuel supply equipment through functional analysis such as pressurizing, heating, cooling and viscosity control of diesel oil and crude oil. The modularized design reduces the complexity of the control system and improves the stability and reliability of the control system.
(3) Smooth switching and self-adaptive regulating technology for fuel oil
When the fuel is switched between diesel oil and crude oil, if the speed is too high, the fuel pipeline is crystallized, a filtering system is damaged, and if the fuel is switched for too long, the cost of the diesel oil is increased. To change the problem, the project adopts an automatically-adjusted fuel switching technology, and the system automatically adjusts the speed of rotation by calculating the temperature change rate of the fuel; if the temperature change rate is greater than 2 ℃/min, the pneumatic valve is suspended for a period of time until the temperature change rate reaches a reasonable range, and if the temperature change rate is too low, the temperature change rate of the fuel is increased by accelerating the rotation of the valve so as to fulfill the aim of quick oil supply; by adopting the technology, the functions of smooth switching of fuel oil and automatic adjustment of switching time are realized.
3. The invention has the beneficial effects that:
(1) The equipment has high working flexibility and has three working modes of manual operation, semi-automatic operation and full-automatic operation;
(2) The self-adaptive adjustment of the fuel switching speed automatically adjusts the time of the fuel switching valve according to the temperature and viscosity states of the fuel, so that the fuel switching is realized as soon as possible, and the problem of fuel emulsification and blockage is avoided;
(3) The modularized structural design provides sufficient space for the disassembly, maintenance and the maintenance of the manual execution part and parts of the equipment;
(4) The control system with simple operation can realize the operation of the whole fuel supply skid system by only pressing a plurality of buttons in a full-automatic mode, and is simple, convenient and easy to operate;
(5) The safety is high: the emergency mode 1 and the emergency mode 2 are guaranteed in an automatic mode, in addition, a semi-automatic mode and a manual mode are provided, the reliability of the whole system is improved layer by layer, and the safe and reliable operation of the fuel supply equipment for the offshore platform is guaranteed.
Claims (8)
1. A fuel supply apparatus for an offshore platform, characterized in that: the equipment comprises a diesel pressurizing module, a fuel pressurizing module and a circulating module, wherein the diesel pressurizing module comprises a diesel pressure regulating pipeline and a diesel pressurizing pipeline which are arranged in parallel, a diesel pressure regulating valve group is arranged on the diesel pressure regulating pipeline, a diesel pressurizing pump group is arranged on the diesel pressurizing pipeline, one ends of the diesel pressure regulating pipeline and the diesel pressurizing pipeline are communicated with an external diesel daily cabinet, and the other ends of the diesel pressure regulating pipeline and the diesel pressurizing pipeline are communicated with the circulating module;
the fuel pressurizing module comprises a diesel crude oil switching valve, a fuel filtering pipeline, a fuel pressure regulating pipeline and a fuel pressurizing pipeline which are arranged in parallel, wherein a fuel pressure regulating valve group is arranged on the fuel pressure regulating pipeline, and a fuel pressurizing pump group is arranged on the fuel pressurizing pipeline; the input ends of the diesel oil crude oil switching valve are respectively communicated with an external diesel oil daily cabinet and an external fuel oil daily cabinet through one-way valves, one ends of a fuel oil pressure regulating pipeline and a fuel oil pressurizing pipeline are communicated with the output end of the diesel oil crude oil switching valve, the other ends of the fuel oil pressure regulating pipeline and the fuel oil pressurizing pipeline are communicated with a fuel oil cleaning pipeline, and the other ends of the fuel oil cleaning pipeline are communicated with a circulation module;
the circulation module comprises a circulation module 1 and a circulation module 2, wherein the circulation module 1 and the circulation module 2 comprise circulation pipelines, the circulation pipelines are sequentially connected with a diesel skid and crude oil skid switching valve, a mixing tank, a fuel circulation pump group, a heater group and a viscosity measurement module, the input ends of the circulation pipelines of the circulation module 1 and the circulation module 2 are communicated with a diesel pressurizing module and a fuel pressurizing module, and the output ends of the circulation pipelines of the circulation module 1 and the circulation module 2 are respectively communicated with external different crude oil generators.
2. The fuel supply apparatus for offshore platform according to claim 1, wherein: and the output end of the circulating pipeline is also provided with a normal emergency switching valve, and the switching output end of the normal emergency switching valve is communicated with the communication part of the input end of the circulating pipeline and the diesel supercharging module.
3. The fuel supply apparatus for offshore platform according to claim 1 or 2, wherein: the output end of the circulation pipeline is also provided with an oil return pipeline, the oil return pipeline is provided with an oil return pressure regulating valve group, a cooler and an oil drum and oil cabinet switching valve, the oil drum output end of the oil drum and oil cabinet switching valve is communicated with the oil mixing drum, the oil cabinet output end of the oil drum and oil cabinet switching valve is connected with a diesel oil crude oil switching valve, the diesel oil output end of the diesel oil crude oil switching valve is communicated with an external diesel oil daily cabinet, and the crude oil output end of the diesel oil crude oil switching valve is communicated with the external crude oil daily cabinet.
4. The fuel supply apparatus for offshore platform according to claim 1, wherein: the heater group is connected with a plurality of heaters in series or in parallel, bypass switches are connected on the heaters in parallel, safety valves are also arranged on the heaters, a discharge valve is arranged at an inlet and an outlet of each heater, and a thermometer is arranged on an inlet and an outlet pipeline of the heater group.
5. The fuel supply apparatus for offshore platform according to claim 1, wherein: the diesel oil pressure regulating valve group and the crude oil pressure regulating valve group are composed of two pressure regulating valves which are connected in parallel.
6. The fuel supply apparatus for offshore platform according to claim 1, wherein: the diesel booster pump set comprises two diesel booster pumps which are arranged in parallel, and the crude oil booster pump set comprises two crude oil booster pumps which are arranged in parallel.
7. The fuel supply apparatus for offshore platform according to claim 1, wherein: the fuel oil cleaning and filtering pipeline is a pipeline formed by connecting a self-cleaning filter and a bypass filter in parallel.
8. A fuel supply method for an offshore platform, characterized by: the method using the fuel supply apparatus for offshore platforms according to any one of claims 1 to 7, the method comprising manual, semi-automatic and fully automatic modes of operation, the fully automatic further comprising the modes of operation of:
(1) Cold car starting operation mode
In the state of the host machine for standby, the fuel oil is supplied to the host machine by utilizing the mode that the diesel pressurizing module and the circulating module corresponding to the host machine jointly operate, the diesel pressurizing module pressurizing pump pumps the diesel oil in the diesel oil daily cabinet and carries out primary pressurizing, the inlet of the circulating module is positioned at the diesel oil interface position, the diesel oil is subjected to secondary pressurizing through the circulating pump after passing through the oil mixing barrel, the diesel oil circulates between the circulating module and the host machine, and the host machine returns oil to the oil mixing barrel after passing through the cooler;
(2) Automatic diesel oil-to-crude oil running mode
The method comprises the steps that a host is started in a cold-car mode and then carries a load, the load reaches a mode of converting the load into crude oil, the mode of converting the crude oil is that a fuel pressurizing module and the host are combined to operate corresponding to a circulating module, the diesel pressurizing module is stopped after the crude oil enters the crude oil mode, an inlet of the fuel pressurizing module is arranged on the crude oil side, a crude oil pressurizing pump pumps crude oil in a crude oil daily cabinet and carries out primary pressurizing, an inlet of the fuel circulating module is arranged at a crude oil interface position, the crude oil is subjected to secondary pressurizing through a circulating pump after passing through a mixing oil tank, the crude oil circulates between the circulating module and the host, meanwhile, the crude oil is heated by an electric heater according to the viscosity of the crude oil, and return oil of the host is cooled through a cooler and then enters the mixing oil tank;
(3) Diesel oil large cleaning mode
In the crude oil mode, the host operates normally with load, and in the large cleaning mode, the inlet of the fuel pressurizing module is turned to the diesel side, the booster pump of the fuel pressurizing module pumps diesel in the diesel daily cabinet, and the diesel passes through the circulating module and enters the host for consumption; the fuel flow pipeline is the same as the crude oil mode, but the fuel viscosity is detected in the circulation module to determine whether the return oil of the host can pass through the cooler;
(4) Diesel small cleaning mode
The diesel pressurizing module is utilized to clean the circulating module, so that crude oil in the circulating module is consumed;
(5) Normal system shutdown mode
Stopping the operation of the circulating pump in the circulating module, and simultaneously stopping the pressurizing module which is operated in combination with the circulating pump on the premise of not influencing the working condition of the other circulating module, wherein all valves in the circulating module and the stopped pressurizing module recover to the initial positions;
(6) Emergency mode 1
The emergency mode 1 cannot be selected on the circulation module, and is only jumped into after a specific fault occurs in a certain mode; the general condition is that the circulation module and the fuel pressurizing module are operated in a certain mode in a combined mode, the fuel pressurizing module fails and alarms to enter an emergency mode 1, the working condition of the emergency mode 1 is the same as that of a cold car mode and a small cleaning mode, and the mode mainly ensures the oil supply of a host under the condition of the failure of a crude oil module;
(7) Emergency mode 2
The emergency mode 2 is to jump to enter when the circulation module fails, or to select to enter on the circulation module, and any mode can be selected to directly enter the emergency mode 2; the emergency mode 2 is to take the diesel pressurizing module as the only power source to build pressure, and supply oil to the host through the large bypass in the circulating module; the inlet of the circulation module is positioned at the diesel side, the outlet valve is changed from a normal position to an emergency position, and the main engine oil return is returned to the crude oil daily cabinet after being cooled by the plate without returning to the oil mixing barrel;
(8) Universal automatic start-stop mode for fuel pressurizing module, diesel pressurizing module and fuel circulating module
The corresponding booster pump or circulating pump is operated in each mode, the pump set is in a standby state, the working pump is used for pressure establishment for 30s at first, if the working pump is not established and is converted into the standby pump for operation, if the working pump is still not established after 30s, the working of the module is stopped and a fault alarm is given; if the pressurizing module and the circulating module both build pressure, a corresponding mode can be entered; if the working pump pressure is reduced to the standard after the mode is entered, the pressure is switched to the standby pump after the pressure is not reestablished within 5s, and the standby pump builds the pressure according to the old 30 s.
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| CN116163850B (en) * | 2023-02-08 | 2024-05-14 | 沪东中华造船(集团)有限公司 | Ship module integrated electric fuel pump control device and control method |
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| KR20120052661A (en) * | 2010-11-16 | 2012-05-24 | 삼성중공업 주식회사 | Semi automatic fuel oil change over system |
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