CN219281844U - LPG supply system of marine engine - Google Patents
LPG supply system of marine engine Download PDFInfo
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- CN219281844U CN219281844U CN202320337553.0U CN202320337553U CN219281844U CN 219281844 U CN219281844 U CN 219281844U CN 202320337553 U CN202320337553 U CN 202320337553U CN 219281844 U CN219281844 U CN 219281844U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The present utility model provides an LPG supply system for a marine engine, comprising: the system comprises an LPG storage tank, a primary LPG pump, a secondary LPG pump, a first LPG heat exchanger, a valve group unit, a second LPG heat exchanger and an LPG collecting tank; the inlet and outlet ends of the LPG storage tank, the primary LPG pump, the secondary LPG pump and the first LPG heat exchanger are sequentially connected and then connected with the inlet end of the LGIP engine through the valve group unit; the outlet end of the LGIP engine is connected with the inlet end of the second LPG heat exchanger through the valve group unit; the outlet end of the second LPG heat exchanger is connected to a pipeline at the inlet end of the secondary LPG pump; the LPG collecting tank is connected to the pipeline of the inlet end and the outlet end of the second LPG heat exchanger to form an LPG return pipeline. The utility model can meet the supply requirement of the engine on the LPG fuel, and simultaneously carry out the reflux treatment on the LPG during and after the operation of the LPG mode, thereby reducing the pollution to the environment.
Description
Technical Field
The utility model relates to the technical field of ship LPG (liquefied petroleum gas) supply, in particular to an LPG supply system of a ship engine and a supply method thereof.
Background
LPG is a new type of marine fuel, with reduced carbon emissions compared to conventional fuels, and is mainly suitable for use as an alternative fuel for LPG transportation vessels. However, the conventional LPG supply system generally has the following technical problems:
the primary pressurizing mode is adopted, so that the requirement on the lift of the pump is high, and the reliability of the booster pump is low;
by adopting a primary pressurizing mode, the LPG returned by the host can only flow back into the LPG storage tank, and pollutants such as lubricating oil and the like are brought to the LPG in the storage tank;
the LPG which is purged out of the pipeline after the end of the LPG mode of the engine cannot be collected and reused, the emission of LPG steam is large, and the environment is polluted greatly.
Disclosure of Invention
The present utility model has been made to solve the above-mentioned drawbacks occurring in the prior art, and provides an LPG supply system for a marine engine and a supply method thereof.
The utility model is realized by the following technical scheme.
According to an aspect of the present utility model, there is provided an LPG supply system of a marine engine, comprising: the system comprises an LPG storage tank, a primary LPG pump, a secondary LPG pump, a first LPG heat exchanger, a valve group unit, a second LPG heat exchanger and an LPG collecting tank; wherein:
the inlet and outlet ends of the LPG storage tank, the primary LPG pump, the secondary LPG pump and the first LPG heat exchanger are sequentially connected and then connected with the inlet end of the LGIP engine through the valve group unit; the outlet end of the LGIP engine is connected with the inlet end of the second LPG heat exchanger through the valve group unit; the outlet end of the second LPG heat exchanger is connected to a pipeline at the inlet end of the secondary LPG pump; the LPG collecting tank is connected to the pipeline at the inlet end and the outlet end of the second LPG heat exchanger;
the first-stage LPG pump and the second-stage LPG pump perform two-stage pressurization on the output LPG, heat or cool the output LPG through the first LPG heat exchanger and output the output LPG to the LGIP engine; the valve group unit divides the LPG refluxed by the LGIP engine into two paths; one path of LPG flows back to the inlet end of the secondary LPG pump after being cooled by the second LPG heat exchanger, and the other path of LPG flows back to the LPG collecting tank and then flows back to the inlet end of the secondary LPG pump from the LPG collecting tank.
Optionally, the output pressure of the primary LPG pump ranges from 18 barg to 25barg; the output pressure of the primary LPG pump is controlled by the primary LPG pump in a variable frequency mode and/or by-pass reflux control mode.
Optionally, the output pressure of the secondary LPG pump is 50-60 barg; the output pressure of the secondary LPG pump is controlled by the frequency conversion of the secondary LPG pump and/or by-pass reflux control.
Optionally, the first LPG heat exchanger heats or cools the LPG to 25-50 ℃.
Optionally, the second LPG heat exchanger heats or cools the LPG to less than 45 ℃.
Optionally, an LPG return valve is arranged on a pipeline between the valve block unit and the inlet end of the second LPG heat exchanger; an LPG collecting valve is arranged on a pipeline between the inlet end of the LPG heat exchanger and the LPG collecting tank; and an LPG output valve is arranged on a pipeline between the outlet end of the LPG heat exchanger and the LPG collecting tank.
Optionally, a nitrogen supply line is further connected to the LPG collection tank, and the nitrogen supply line is used for supplying nitrogen to the LPG collection tank through a control of the nitrogen supply line, so that the pressure of the LPG collection tank is maintained within a set pressure range.
Optionally, the pressure of the nitrogen gas supplied to the LPG collection tank by the nitrogen gas supply line is in the range of 18-32 barg.
Optionally, the LPG collection tank is further connected with an LPG discharge line, and the LPG discharge line is used for discharging the LPG in the LPG collection tank through the control of the LPG discharge valve so as to avoid the overpressure in the LPG collection tank.
According to another aspect of the present utility model, there is provided an LPG supply method of an LPG supply system of a marine engine according to any one of the above, comprising:
storing LPG in the LPG tank;
controlling output LPG, and sequentially carrying out two-stage pressurization through the primary LPG pump and the secondary LPG pump to obtain LPG within a set pressure range;
heating or cooling the LPG within the set pressure range through the first LPG heat exchanger to obtain the LPG within the set temperature range, and outputting the LPG to an LGIP engine for use;
the LPG refluxed by the LGIP engine is divided into two paths after passing through the valve group unit, wherein the LGIP engine is cooled by the second LPG heat exchanger and then conveyed to the inlet end of the secondary LPG pump for recycling during the running process of the LPG mode; when the LGIP engine is in the end of the LPG mode, the blown LPG flows back into the LPG collecting tank and flows back to the inlet end of the secondary LPG pump (3) from the LPG collecting tank;
the above process is repeated to supply the LPG in circulation.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has at least one of the following beneficial effects:
the LPG supply system and the supply method thereof of the marine engine solve the problems of continuous and stable supply of LPG fuel when the LGIP type dual-fuel engine operates in an LPG mode, and can meet the supply requirement of the engine on the LPG fuel by combining the control of the flow, the pressure, the temperature and the like of the LPG.
The LPG supply system and the supply method thereof of the marine engine can enable the LGIP engine to recover and treat the LPG when the LPG is in a backflow mode and the LPG is purged after the operation of the LPG mode is finished, thereby avoiding the LPG from being discharged into the environment in a large amount and reducing the pollution to the environment.
According to the LPG supply system and the LPG supply method for the marine engine, provided by the utility model, the two-stage pump is connected in series, so that the respective lift of each stage of pump can be greatly reduced, and the type selection requirement of the LPG pump is reduced. Meanwhile, the method of returning the return LPG to the inlet of the secondary LPG pump is adopted, so that the return of the LPG to the LPG storage tank is avoided, and pollutants such as lubricating oil and the like are brought to the LPG in the storage tank.
According to the LPG supply system and the LPG supply method of the marine engine, provided by the utility model, the LPG collection tank is arranged, so that the recovery and separation of the LPG and the nitrogen in the engine purging process can be realized, and the unnecessary discharge of the LPG and the environmental pollution are reduced.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
fig. 1 is a schematic view showing the overall structure of an LPG supply system of a marine engine according to a preferred embodiment of the present utility model.
In the figure: 1 is an LPG storage tank, 2 is a primary LPG pump, 3 is a secondary LPG pump, 4 is a first LPG heat exchanger, 5 is a valve group unit, 6 is an LGIP engine, 7 is a second LPG heat exchanger, 8 is an LPG output valve, 9 is an LPG return valve, 10 is an LPG collecting valve, 11 is an LPG collecting tank, 12 is a nitrogen supply valve, and 13 is an LPG discharge valve.
Detailed Description
The following describes embodiments of the present utility model in detail: the embodiment is implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given. It should be noted that variations and modifications can be made by those skilled in the art without departing from the spirit of the utility model, which falls within the scope of the utility model.
An embodiment of the present utility model provides an LPG supply system for a marine engine for supplying LPG fuel satisfying temperature and pressure requirements to an LGIP type dual fuel engine.
As shown in fig. 1, the LPG supply system of the marine engine provided in this embodiment may include: an LPG storage tank 1, a primary LPG pump 2, a secondary LPG pump 3, a first LPG heat exchanger 4, a valve block unit 5, a second LPG heat exchanger 7, and an LPG collection tank 11; wherein:
the inlet and outlet ends of the LPG storage tank 1, the primary LPG pump 2, the secondary LPG pump 3 and the first LPG heat exchanger 4 are connected in sequence and then connected with the inlet end of the LGIP engine 6 through the valve group unit 5; the outlet end of the LGIP engine 6 is connected with the inlet end of the second LPG heat exchanger 7 through the valve group unit 5; the outlet end of the second LPG heat exchanger 7 is connected to a pipeline at the inlet end of the secondary LPG pump 3; the LPG collecting tank 11 is connected to the pipeline of the inlet end and the outlet end of the second LPG heat exchanger 7;
the first-stage LPG pump 2 and the second-stage LPG pump 3 perform two-stage pressurization on the output LPG, heat or cool the output LPG through the first LPG heat exchanger 4, and output the output LPG to the LGIP engine 6; the valve group unit 5 divides the LPG flowing back from the LGIP engine 6 into two paths; one path of LPG is cooled by the second LPG heat exchanger 7 and then flows back to the inlet end of the secondary LPG pump 3, the other path of LPG flows back to the LPG collecting tank 11, and then flows back to the inlet end of the secondary LPG pump 3 from the LPG collecting tank 11.
In a preferred embodiment, the output pressure of the primary LPG pump 2 is in the range 18-25 barg; the output pressure of the primary LPG pump 2 is controlled by the primary LPG pump 2 frequency conversion control and/or bypass reflux control for controlling the LPG flow.
In a preferred embodiment, the output pressure of the secondary LPG pump 3 is 50-60 barg; the output pressure of the secondary LPG pump 3 is controlled by frequency conversion and/or bypass return control of the secondary LPG pump 3.
In a preferred embodiment, the first LPG heat exchanger 4 heats or cools the LPG to 25-50 ℃.
In a preferred embodiment, the second LPG heat exchanger 7 heats or cools the LPG to less than 45 ℃.
In a preferred embodiment, an LPG return valve 9 is provided in the line between the valve block unit 5 and the inlet end of the second LPG heat exchanger 7; an LPG collecting valve 10 is arranged on a pipeline between the inlet end of the LPG heat exchanger 7 and the LPG collecting tank 11; an LPG output valve 8 is provided on the line between the outlet end of the LPG heat exchanger 7 and the LPG collection tank 11.
In a preferred embodiment, a nitrogen supply line is further connected to the LPG tank 11, and the nitrogen supply line is controlled by a nitrogen supply valve 12 for supplying nitrogen to the LPG tank 11 so that the pressure of the LPG tank 11 is maintained within a set pressure range.
In a preferred embodiment, the pressure at which the nitrogen gas is supplied to the LPG collection tank 11 by the nitrogen gas supply line is in the range of 18 to 32barg.
In a preferred embodiment, the LPG collection tank 11 is also connected with an LPG relief line, controlled by an LPG relief valve 13, for relief of the LPG in the LPG collection tank 11, so as to avoid overpressure in the LPG collection tank 11.
An embodiment of the present utility model further provides an LPG supply method of an LPG supply system of any one of the above marine engines, which may include:
s1, storing LPG in an LPG storage tank 1;
s2, controlling output LPG, and sequentially carrying out two-stage pressurization through a primary LPG pump 2 and a secondary LPG pump 3 to obtain LPG within a set pressure range;
s3, heating or cooling the LPG within the set pressure range through the first LPG heat exchanger 4 to obtain the LPG within the set temperature range, and outputting the LPG to the LGIP engine 6 for use;
s4, the LPG which flows back by the LGIP engine 6 is divided into two paths after passing through the valve group unit 5, wherein in the running process of the LGIP engine in an LPG mode, the returned LPG is cooled by the second LPG heat exchanger 7 and then is conveyed to the inlet end of the secondary LPG pump 3, and the LPG is recycled; when the LGIP engine is finished in the LPG mode, the purged LPG flows back into the LPG collection tank 11 and then flows back from the LPG collection tank 11 to the inlet end of the secondary LPG pump 3;
s5, repeating the process, and circularly supplying the LPG.
It should be noted that, the steps in the method provided by the present utility model may be implemented by using corresponding components in the system, and those skilled in the art may refer to a technical scheme of the system to implement a step flow of the method, that is, an embodiment in the system may be understood as a preferred embodiment of the implementation method, which is not described herein.
In some embodiments of the utility model:
the LPG fuel is stored in the LPG storage tank, is pressurized by the primary LPG pump and then is conveyed to the secondary LPG pump, is further pressurized by the secondary LPG pump and then is conveyed to the first LPG heat exchanger, is heated or cooled by the first LPG heat exchanger and then is further conveyed to the valve unit, and finally is conveyed to the LGIP engine to be used as fuel.
The output pressure of the primary LPG pump is in the range of 18-25barg, and the pressure is controlled by means of the variable frequency control of the primary LPG pump or the bypass reflux control or both.
The output pressure of the secondary LPG pump should be controlled at around 53barg, which is controlled by means of either variable frequency control of the secondary LPG pump or bypass return control or both.
The first LPG heat exchanger heats or cools the LPG to 25-50 ℃.
The supply system is provided with an LPG return line comprising: a second LPG heat exchanger, an LPG collecting tank, an LPG return valve and an LPG collecting valve. When the LGIP engine operates in the LPG mode, the returned LPG is cooled by the second LPG heat exchanger after passing through the LPG return valve and then is conveyed to the front end of the secondary LPG pump; at the end of the LPG mode operation, the LGIP engine is purged of LPG and then returned to the LPG collection tank through the LPG collection valve.
The LPG collection tank is provided with an LPG collection pipe line, to which an LPG collection valve is mounted, an LPG output pipe line, a nitrogen supply pipe line, and an LPG discharge pipe line.
The LPG output line is provided with an LPG output valve and supplies the output LPG to the secondary LPG pump inlet line.
The nitrogen supply line is provided with a nitrogen supply valve which supplies 18 to 32barg of nitrogen to the LPG collection tank, maintaining the LPG collection tank at a certain pressure range.
The LPG relief line is provided with an LPG relief valve, which may be a safety valve or a switching valve, or both, configured to prevent overpressure in the LPG collection tank.
The LPG supply system and the supply method thereof for the marine engine provided by the embodiment of the utility model are applied to the LPG supply of ships, and are used for supplying LPG fuel meeting the temperature and pressure requirements for the LGIP type dual-fuel engine. The LPG is stored in an LPG storage tank, is pressurized to 18-25barg by a primary LPG pump and then is conveyed to a secondary LPG pump, is pressurized to about 53barg by the secondary LPG pump and then is heated to 25-50 ℃ by a first LPG heat exchanger, and then is conveyed to an engine for use after passing through a valve group unit. The LPG returned by the LPG engine is divided into two paths after passing through the valve group unit, one path of the LPG is cooled by the second LPG heat exchanger and then flows back to the inlet of the secondary LPG pump, and the other path of the LPG is returned to the LPG collecting tank and then flows back to the inlet of the secondary LPG pump from the LPG collecting tank.
The LPG supply system and the supply method of the marine engine solve the problems of continuous and stable supply of LPG fuel when the LGIP type dual-fuel engine operates in an LPG mode, and can meet the supply requirement of the engine on the LPG fuel by combining the control of the flow, the pressure, the temperature and the like of the LPG; the method can enable the LGIP engine to recover and treat the LPG when the LPG is in a backflow mode during the running of the LPG and when the LPG is purged after the running of the LPG mode is finished, avoid the LPG from being discharged into the environment in a large amount, and reduce the pollution to the environment.
The foregoing embodiments of the present utility model are not all well known in the art.
The foregoing describes specific embodiments of the present utility model. It is to be understood that the utility model is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the utility model.
Claims (9)
1. An LPG supply system for a marine engine, comprising: an LPG storage tank (1), a primary LPG pump (2), a secondary LPG pump (3), a first LPG heat exchanger (4), a valve group unit (5), a second LPG heat exchanger (7) and an LPG collecting tank (11); wherein:
the inlet and outlet ends of the LPG storage tank (1), the primary LPG pump (2), the secondary LPG pump (3) and the first LPG heat exchanger (4) are sequentially connected, and then are connected with the inlet end of the LGIP engine (6) through the valve group unit (5); the outlet end of the LGIP engine (6) is connected with the inlet end of the second LPG heat exchanger (7) through the valve group unit (5); the outlet end of the second LPG heat exchanger (7) is connected to a pipeline at the inlet end of the secondary LPG pump (3); the LPG collecting tank (11) is connected to the pipeline at the inlet end and the outlet end of the second LPG heat exchanger (7);
the primary LPG pump (2) and the secondary LPG pump (3) perform two-stage pressurization on the output LPG, heat or cool the output LPG through the first LPG heat exchanger (4), and then output the output LPG to the LGIP engine (6); the valve group unit (5) divides the LPG returned by the LGIP engine (6) into two paths; one path of LPG is cooled by the second LPG heat exchanger (7) and then flows back to the inlet end of the secondary LPG pump (3), the other path of LPG flows back to the LPG collecting tank (11), and then flows back to the inlet end of the secondary LPG pump (3) from the LPG collecting tank (11).
2. LPG supply system for a marine engine according to claim 1, characterized in that the output pressure of the primary LPG pump (2) ranges from 18 to 25barg; the output pressure of the primary LPG pump (2) is controlled through frequency conversion and/or bypass backflow of the primary LPG pump (2).
3. LPG supply system for a marine engine according to claim 1, characterized in that the output pressure of the secondary LPG pump (3) is 50-60 barg; the output pressure of the secondary LPG pump (3) is controlled by frequency conversion and/or bypass backflow of the secondary LPG pump (3).
4. LPG supply system for a marine engine according to claim 1, characterized in that the first LPG heat exchanger (4) heats or cools the LPG to 25-50 ℃.
5. LPG supply system for a marine engine according to claim 1, characterized in that the second LPG heat exchanger (7) heats or cools the LPG to less than 45 ℃.
6. LPG supply system for a marine engine according to claim 1, characterized in that an LPG return valve (9) is provided on the line between the valve block unit (5) and the inlet end of the second LPG heat exchanger (7); an LPG collecting valve (10) is arranged on a pipeline between the inlet end of the LPG heat exchanger (7) and the LPG collecting tank (11); an LPG output valve (8) is arranged on a pipeline between the outlet end of the LPG heat exchanger (7) and the LPG collecting tank (11).
7. LPG supply system for a marine engine according to claim 1, characterized in that the LPG collection tank (11) is also connected with a nitrogen supply line for supplying nitrogen to the LPG collection tank (11) by means of control of a nitrogen supply valve (12) such that the pressure of the LPG collection tank (11) is maintained within a set pressure range.
8. LPG supply system for a marine engine according to claim 7, characterized in that the pressure of the nitrogen supply line to the LPG collection tank (11) is in the range of 18-32 barg.
9. LPG supply system for a marine engine according to claim 1, characterized in that the LPG collection tank (11) is also connected with an LPG discharge line for discharging LPG and nitrogen in the LPG collection tank (11) by means of a control of an LPG discharge valve (13) in order to avoid overpressure in the LPG collection tank (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320337553.0U CN219281844U (en) | 2023-02-28 | 2023-02-28 | LPG supply system of marine engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320337553.0U CN219281844U (en) | 2023-02-28 | 2023-02-28 | LPG supply system of marine engine |
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| Publication Number | Publication Date |
|---|---|
| CN219281844U true CN219281844U (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320337553.0U Active CN219281844U (en) | 2023-02-28 | 2023-02-28 | LPG supply system of marine engine |
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| CN (1) | CN219281844U (en) |
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- 2023-02-28 CN CN202320337553.0U patent/CN219281844U/en active Active
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