阅读说明：本技术 双燃料船舶发动机lng供气系统 (LNG (liquefied Natural gas) supply system for dual-fuel ship engine ) 是由 赵超 解卫阔 王廷勇 董如意 付洪田 于 2020-06-23 设计创作，主要内容包括：本发明提供一种双燃料船舶发动机LNG供气系统,包括LNG储罐、天然气日用罐、低压气化装置、低压缓冲罐、辅机阀组装置、船舶辅机发动机、高压泵系统、高压气化装置、高压缓冲装置、主机阀组装置、船舶主机发动机、辅机W/G循环系统、主机W/G循环系统、潜液泵、辅机发动机集气箱、第一盘管、第一尾气催化装置、辅机排气管、主机发动机集气箱、第二盘管、第二尾气催化装置、主机排气管、第一三通阀和第二三通阀。(The invention provides an LNG (liquefied natural gas) supply system for a dual-fuel marine engine, which comprises an LNG storage tank, a natural gas daily tank, a low-pressure gasification device, a low-pressure buffer tank, an auxiliary engine valve group device, a marine auxiliary engine, a high-pressure pump system, a high-pressure gasification device, a high-pressure buffer device, a main engine valve group device, a marine main engine, an auxiliary engine W/G circulating system, a main engine W/G circulating system, a submerged pump, an auxiliary engine gas collection tank, a first coil pipe, a first tail gas catalytic device, an auxiliary engine exhaust pipe, a main engine gas collection tank, a second coil pipe, a second tail gas catalytic device, a main engine exhaust pipe, a first.)

1. An LNG gas supply system of a dual-fuel ship engine is characterized in that, the device comprises an LNG storage tank (3), a natural gas daily tank (4), a low-pressure gasification device (5), a low-pressure buffer tank (6), an auxiliary valve group device (7), a marine auxiliary engine (8), a high-pressure pump system (9), a high-pressure gasification device (10), a high-pressure buffer device (11), a main engine valve group device (12), a marine main engine (13), an auxiliary W/G circulating system (14), a main W/G circulating system (15), a submerged pump (31), an auxiliary engine gas collection box (81), a first coil pipe (82), a first tail gas catalytic device (83), an auxiliary exhaust pipe (86), a main engine gas collection box (131), a second coil pipe (132), a second tail gas catalytic device (133), a main exhaust pipe (137), a first three-way valve (141) and a second three-way valve (151);

the immersed pump (31) is arranged at the bottom of the LNG storage tank (3), the outlet of the immersed pump (31) is divided into two paths, one path is communicated with the top of the LNG storage tank (3), the other path is communicated with the inlet of the high-pressure pump system (9), the outlet of the high-pressure pump system (9) is communicated with the natural gas inlet of the high-pressure gasification device (10), the natural gas outlet of the high-pressure gasification device (10) is communicated with the inlet of the high-pressure buffer device (11), the outlet of the high-pressure buffer device (11) is divided into two paths, one path is communicated with the inlet of the ship main engine (13) through the main engine valve group device (12), the other path is communicated with the second tail gas catalytic device (133) after being converged with the waste gas outlet pipeline of the ship main engine (13), and the second tail gas catalytic device (133) is arranged in the main engine gas collection box (131), the main engine exhaust pipe (137) is communicated with the main engine gas collecting tank (131), the outlet of the main engine W/G circulating system (15) is communicated with the inlet of the second three-way valve (151), the second coil (132) is arranged in the main engine gas collecting tank (131), the outlet of the second three-way valve (151) is divided into two paths, one path is communicated with the inlet of the second coil (132), the outlet of the second coil (132) is communicated with the middle heating medium inlet of the high-pressure gasification device (10), the other path is bypassed with the outlet of the second coil (132) through a second bypass pipeline (142), and the middle heating medium outlet of the high-pressure gasification device (10) is communicated with the inlet of the main engine W/G circulating system (15);

the top outlet of the LNG storage tank (3) is communicated with the inlet of the natural gas daily tank (4), the outlet of the natural gas daily tank (4) is communicated with the BOG inlet of the low-pressure gasification device (5), the BOG outlet of the low-pressure gasification device (5) is communicated with the inlet of the low-pressure buffer tank (6), the outlet of the low-pressure buffer tank (6) is communicated with the inlet of the ship auxiliary engine (8) through the auxiliary valve group device (7), the exhaust outlet of the ship auxiliary engine (8) is communicated with the first tail gas catalytic device (83), the first tail gas catalytic device (83) is arranged in the auxiliary engine gas collection box (81), the auxiliary exhaust pipe (86) is communicated with the auxiliary engine gas collection box (81), the outlet of the auxiliary W/G circulating system (14) is communicated with the inlet of the first three-way valve (141), first coil pipe (82) set up in auxiliary engine gas collection tank (81), the export of first three-way valve (141) is divided into two the tunnel, all the way with the entry intercommunication of first coil pipe (82), the export of first coil pipe (82) with the middle heating medium entry intercommunication of low pressure gasification equipment (5), another way via first bypass pipeline (152) with the export bypass of first coil pipe (82), the middle heating medium export of low pressure gasification equipment (5) with the entry intercommunication of auxiliary machine W/G circulation system (14).

2. The LNG gas supply system for the dual-fuel marine engine as claimed in claim 1, further comprising a port filling receiving device (1) and a starboard filling receiving device (2), wherein the port filling receiving device (1) and the starboard filling receiving device (2) are respectively provided with an outlet and an inlet, the outlet of the port filling receiving device (1) and the outlet of the starboard filling receiving device (2) are converged and then respectively communicated with the top position and the bottom position in the LNG storage tank (3), and the inlet of the port filling receiving device (1) and the inlet of the starboard filling receiving device (2) are converged and then communicated with the top of the LNG storage tank (3).

3. The LNG supply system of a dual-fuel ship engine as claimed in claim 2, wherein a first automatic control valve (33) is provided on a pipeline in which an outlet of the port refueling receiving device (1) and an outlet of the starboard refueling receiving device (2) are merged and then communicated with a top position in the LNG storage tank (3), a second automatic control valve (34) is provided on a pipeline in which an outlet of the port refueling receiving device (1) and an outlet of the starboard refueling receiving device (2) are merged and then communicated with a bottom position in the LNG storage tank (3), a third automatic control valve (35) is provided on a pipeline in which an inlet of the port refueling receiving device (1) and an inlet of the starboard refueling receiving device (2) are merged and then communicated with a top of the LNG storage tank (3), a fourth automatic control valve (36) is provided on a pipeline in which a top outlet of the LNG (3) and an inlet of the natural gas day tank (4) are communicated, a fifth automatic control valve (37) is arranged on a pipeline for communicating the outlet of the immersed pump (31) with the inlet of the high-pressure pump system (9), a sixth automatic control valve (38) is arranged on a pipeline for communicating the outlet of the immersed pump (31) with the top of the LNG storage tank (3), a seventh automatic control valve (41) is arranged on a pipeline for communicating the outlet of the natural gas daily tank (4) with the BOG inlet of the low-pressure gasification device (5), an eighth automatic control valve (62) is arranged on a pipeline for communicating the outlet of the low-pressure buffer tank (6) with the auxiliary valve group device (7), a ninth automatic control valve (91) is arranged on a pipeline for communicating the outlet of the high-pressure pump system (9) with the natural gas inlet of the high-pressure gasification device (10), and a tenth automatic control valve (113) is arranged on a pipeline for communicating the outlet of the high-pressure buffering device (11) with the main valve group device (12).

4. The LNG supply system for the dual-fuel marine engine as claimed in claim 1, wherein an eleventh automatic control valve (112) is provided on a pipeline where an outlet of the high pressure buffer device (11) and an exhaust gas outlet of the marine main engine (13) are merged, a gas detection device (136) is provided on the main engine exhaust pipe (137), and the gas detection device (136) is in signal connection with the eleventh automatic control valve (112) and is used for controlling the eleventh automatic control valve (112).

5. The system for supplying LNG to a dual fuel marine engine as claimed in claim 1, wherein a first temperature sensor (61) is provided on the low pressure buffer tank (6), and the first temperature sensor (61) is in signal connection with the first three-way valve (141) and is used to control the first three-way valve (141).

6. The LNG gas supply system for a dual-fuel marine engine as claimed in claim 1, wherein a second temperature sensor (111) is provided on the high pressure buffer (11), and the second temperature sensor (111) is in signal connection with the second three-way valve (151) and is used to control the second three-way valve (151).

7. The LNG supply system for the dual-fuel marine engine as claimed in claim 1, characterized in that a pressure sensor (114) is provided on the high-pressure buffer device (11), and the pressure sensor (114) is in signal connection with the high-pressure pump system (9) and is used for controlling the high-pressure pump system (9).

8. The system for supplying LNG to an engine of a dual fuel ship as claimed in claim 1, wherein the LNG storage tank (3) is provided with a detection device (32).

9. The LNG supply system of the dual-fuel marine engine as claimed in claim 1, wherein the main engine gas header tank (131) and the auxiliary engine gas header tank (81) are both in a structure of being separated from each other in a left-right direction, the left side and the right side of the auxiliary engine gas header tank (81) are communicated with each other and connected through a first flange (84), and the left side and the right side of the main engine gas header tank (131) are communicated with each other and connected through a second flange (134).

10. The LNG supply system of the dual-fuel marine engine of claim 1, wherein the first exhaust gas catalytic device (83) and the second exhaust gas catalytic device (133) are vertically arranged, an exhaust gas outlet of the marine auxiliary engine (8) is communicated with a top inlet of the first exhaust gas catalytic device (83), and an outlet of the high-pressure buffering device (11) is communicated with a top inlet of the second exhaust gas catalytic device (133) after being merged with an exhaust gas outlet pipeline of the marine main engine (13).

Technical Field

The invention relates to the technical field of ships, in particular to an LNG gas supply system of a dual-fuel ship engine.

Background

Attached rule VI of the MARPOL convention (International convention for preventing pollution from ships) of the 73/78: NO of new ship in ECA zone (ship emission control zone) after 2016 (1/1)_XThe emission of (A) is in accordance with the Tier III standard; for SO_XFor the emission of (1), after 1/2020, the sulfur content of fuel oil of a ship sailing in any area must be less than 0.5% m/m (mass/mass); for ships sailing in the ECA, the sulfur content of the fuel oil must be below 0.1% m/m after 1 month and 1 day of 2015.

With the stricter requirements of the international maritime organization on the exhaust emission indexes, ships need to be matched with tail Gas post-treatment equipment or select clean fuel, and meanwhile, LNG (Liquefied Natural Gas) is more and more favored as clean energy.

At present, the dual-fuel engine with mature technology mainly comprises two-stroke low-speed dual-fuel engines and four-stroke medium-speed dual-fuel engines. The two-stroke low-speed dual-fuel engine is mainly an ME-GI engine (Maningx dual-fuel low-speed engine) developed and designed by MAN-ES company and a DF engine (Wintdtell dual-fuel low-speed engine) developed by WinGD company; for a four-stroke medium speed dual fuel engine, MAN-ES and Wartsila have corresponding mature products, namely DF engines.

The LNG power ship is matched with a main engine type which is a dual-fuel engine, compared with a conventional fuel engine, the dual-fuel engine can adopt a fuel mode and can also be switched to a fuel mode, and the main fuel type of the fuel mode is natural gas; in gas mode, CO₂The emission can be reduced by 20 to 25 percent; the emission of sulfur oxides and particulate matters can be reduced by 100 percent, and WinGD low-speed double-emission technology is adoptedThe emission of nitrogen oxides of the fuel engine can be reduced by 85-90 percent and can reach the Tier III standard, but the nitrogen oxides can not meet the Tier III standard by adopting the MAN-ES low-speed dual-fuel engine. Because the dual-fuel engine has an overlap angle of the gas valve, when the dual-fuel engine operates in a gas mode, a small amount of methane is discharged to the atmosphere along with waste gas, the emission of greenhouse gas is increased, and the environmental pollution is caused.

At present, the most widely applied marine LNG gas supply technology is divided into low-pressure gas supply and high-pressure gas supply, a low-pressure gas supply system aims at a two-stroke low-speed machine or a medium-speed machine of WinGD company, the liquid part is boosted to 16bar through a low-pressure pump, and the gas part is boosted through a compressor and supplied to gas equipment; the high-pressure gas supply system is directed at a two-stroke low-speed diesel engine of MAN-ES company, the liquid part is boosted to 300bar by a high-pressure pump, and the gas part is boosted by a compressor and supplied to a gas appliance for use. However, the existing LNG supply technology for the ship needs to provide an additional heating source and NO in the exhaust gas_XCan not meet the emission standard of the third stage, and methane escapes.

Disclosure of Invention

The invention aims to provide an LNG (liquefied natural gas) supply system of a dual-fuel ship engine and a dual-fuel ship, aims to overcome the defects in the background art, and aims to provide an additional heating source and NO (nitric oxide) in exhaust gas aiming at the requirements of the existing LNG supply technology for ships_XThe problems of third-stage emission standard, methane escape and the like cannot be met, and the exhaust waste heat of an engine in the gas supply system is recycled and the gas emission index is better through reasonable design on the premise of meeting the scientific principle.

The invention provides an LNG (liquefied natural gas) supply system for a dual-fuel marine engine, which comprises an LNG storage tank, a natural gas daily tank, a low-pressure gasification device, a low-pressure buffer tank, an auxiliary engine valve group device, a marine auxiliary engine, a high-pressure pump system, a high-pressure gasification device, a high-pressure buffer device, a main engine valve group device, a marine main engine, an auxiliary engine W/G circulating system, a main engine W/G circulating system, a submerged pump, an auxiliary engine gas collection tank, a first coil pipe, a first tail gas catalytic device, an auxiliary engine exhaust pipe, a main engine gas collection tank, a second coil pipe, a second tail gas catalytic device, a main engine exhaust pipe, a first;

the immersed pump is arranged at the bottom of the LNG storage tank, the outlet of the immersed pump is divided into two paths, one path is communicated with the top of the LNG storage tank, the other path is communicated with the inlet of the high-pressure pump system, the outlet of the high-pressure pump system is communicated with the natural gas inlet of the high-pressure gasification device, the natural gas outlet of the high-pressure gasification device is communicated with the inlet of the high-pressure buffer device, the outlet of the high-pressure buffer device is divided into two paths, one path is communicated with the inlet of the marine main engine through the main engine valve group device, the other path is communicated with the second tail gas catalytic device after being converged with the waste gas outlet pipeline of the marine main engine, the second tail gas catalytic device is arranged in the main engine gas collection box, the main engine exhaust pipe is communicated with the main engine gas collection box, and the outlet of the main engine W/G circulating system is communicated with the inlet, the second coil is arranged in the gas collecting box of the main engine, the outlet of the second three-way valve is divided into two paths, one path is communicated with the inlet of the second coil, the outlet of the second coil is communicated with the inlet of the intermediate heating medium of the high-pressure gasification device, the other path is bypassed with the outlet of the second coil through a second bypass pipeline, and the outlet of the intermediate heating medium of the high-pressure gasification device is communicated with the inlet of the main W/G circulating system;

the top outlet of the LNG storage tank is communicated with the inlet of the natural gas daily tank, the outlet of the natural gas daily tank is communicated with the BOG inlet of the low-pressure gasification device, the BOG outlet of the low-pressure gasification device is communicated with the inlet of the low-pressure buffer tank, the outlet of the low-pressure buffer tank is communicated with the inlet of the marine auxiliary engine through the auxiliary valve group device, the waste gas outlet of the marine auxiliary engine is communicated with the first tail gas catalytic device, the first tail gas catalytic device is arranged in the auxiliary engine gas collecting box, the auxiliary exhaust pipe is communicated with the auxiliary engine gas collecting box, the outlet of the auxiliary W/G circulating system is communicated with the inlet of the first three-way valve, the first coil pipe is arranged in the auxiliary engine gas collecting box, the outlet of the first three-way valve is divided into two ways, and one way is communicated with the inlet of the first coil pipe, the outlet of the first coil is communicated with the intermediate heating medium inlet of the low-pressure gasification device, the other path of the first coil is in bypass with the outlet of the first coil through a first bypass pipeline, and the intermediate heating medium outlet of the low-pressure gasification device is communicated with the inlet of the auxiliary W/G circulating system.

Furthermore, the LNG gas supply system for the dual-fuel ship engine further comprises a port filling receiving device and a starboard filling receiving device, wherein the port filling receiving device and the starboard filling receiving device are respectively provided with an outlet and an inlet, the outlet of the port filling receiving device is communicated with the top position and the bottom position in the LNG storage tank after being converged with the outlet of the starboard filling receiving device, and the inlet of the port filling receiving device is communicated with the top of the LNG storage tank after being converged with the inlet of the starboard filling receiving device.

Furthermore, a first automatic control valve is arranged on a pipeline which is communicated with the top position in the LNG storage tank after an outlet of the port filling and receiving device is converged with an outlet of the starboard filling and receiving device, a second automatic control valve is arranged on a pipeline which is communicated with the bottom position in the LNG storage tank after an outlet of the port filling and receiving device is converged with an outlet of the starboard filling and receiving device, a third automatic control valve is arranged on a pipeline which is communicated with the top of the LNG storage tank after an inlet of the port filling and receiving device is converged with an inlet of the starboard filling and receiving device, a fourth automatic control valve is arranged on a pipeline which is communicated with an inlet of the natural gas daily tank and an outlet of the LNG storage tank, a fifth automatic control valve is arranged on a pipeline which is communicated with an inlet of the high-pressure pump system and an outlet of the submerged pump is communicated with the top of the LNG storage tank, the pipeline that the export of natural gas day jar with the BOG entry of low pressure gasification equipment communicates is equipped with seventh automatic control valve, the export of low pressure buffer tank with be equipped with eighth automatic control valve on the pipeline of auxiliary valve group device intercommunication, the export of high pressure pump system with be equipped with ninth automatic control valve on the pipeline of high pressure gasification equipment's natural gas entry intercommunication, the export of high pressure buffer device with be equipped with the tenth automatic control valve on the pipeline of main engine valve group device intercommunication.

Furthermore, an eleventh automatic control valve is arranged on a pipeline where an outlet of the high-pressure buffering device and a waste gas outlet of the marine main engine are converged, a gas detection device is arranged on an exhaust pipe of the main engine, and the gas detection device is in signal connection with the eleventh automatic control valve and is used for controlling the eleventh automatic control valve.

Furthermore, a first temperature sensor is arranged on the low-pressure buffer tank, and the first temperature sensor is in signal connection with the first three-way valve and is used for controlling the first three-way valve.

Furthermore, a second temperature sensor is arranged on the high-pressure buffering device, and the second temperature sensor is in signal connection with the second three-way valve and is used for controlling the second three-way valve.

Furthermore, a pressure sensor is arranged on the high-pressure buffer device, and the pressure sensor is in signal connection with the high-pressure pump system and is used for controlling the high-pressure pump system.

Further, the LNG storage tank is provided with a detection device.

Furthermore, the main engine gas collecting tank and the auxiliary engine gas collecting tank are of a structure which is formed by a left split body and a right split body, the left side and the right side of the auxiliary engine gas collecting tank are communicated with each other and connected through a first flange, and the left side and the right side of the main engine gas collecting tank are communicated with each other and connected through a second flange.

Further, the first tail gas catalytic device and the second tail gas catalytic device are both vertically arranged, an exhaust gas outlet of the marine auxiliary engine is communicated with a top inlet of the first tail gas catalytic device, and an outlet of the high-pressure buffering device is communicated with a top inlet of the second tail gas catalytic device after being converged with an exhaust gas outlet pipeline of the marine main engine.

According to the LNG gas supply system for the dual-fuel ship engine, waste heat of engine exhaust gas is used as a heat source to heat the intermediate heating medium, and the heated intermediate heating medium is used for exchanging heat with LNG and BOG, so that the temperature of the LNG and the BOG is increased, and the use of high-temperature heat sources such as steam can be reduced. Meanwhile, the amount of the intermediate heating medium entering the gas collecting tank of the engine is controlled by adjusting the three-way valve, so that the temperature of the natural gas in the buffer tank meets the requirement of the engine.

Because the dual-fuel engine has an air valve overlap angle, a small amount of methane can be discharged to the atmosphere along with the waste gas, and the catalytic reaction device is arranged in the gas collection box of the engine, so that the methane and NO in the waste gas can be realized_XReact to react methane with NO in the exhaust gas_XThe content of the compound reaches the standard.

Drawings

Fig. 1 is a schematic structural diagram of an LNG supply system for a dual-fuel ship engine according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an LNG supply system for a dual-fuel ship engine according to a second embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.