CN111594746A - LNG (liquefied Natural gas) supply system for dual-fuel ship engine - Google Patents

LNG (liquefied Natural gas) supply system for dual-fuel ship engine Download PDF

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Publication number
CN111594746A
CN111594746A CN202010578537.1A CN202010578537A CN111594746A CN 111594746 A CN111594746 A CN 111594746A CN 202010578537 A CN202010578537 A CN 202010578537A CN 111594746 A CN111594746 A CN 111594746A
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China
Prior art keywords
outlet
engine
communicated
gas
pressure
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CN202010578537.1A
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Inventor
赵超
解卫阔
王廷勇
董如意
付洪田
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Sunrui Marine Environment Engineering Co ltd
Qingdao Sunrui Marine Environment Engineering Co Ltd
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Sunrui Marine Environment Engineering Co ltd
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Publication of CN111594746A publication Critical patent/CN111594746A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/06—Apparatus for de-liquefying, e.g. by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F17C9/04—Recovery of thermal energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/042—Reducing risk of explosion
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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

Abstract

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.

Description

LNG (liquefied Natural gas) supply system for dual-fuel ship engine
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 SOXFor 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 gasXCan 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 shipsXThe 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 realizedXReact to react methane with NO in the exhaust gasXThe 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.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
First embodiment
As shown in fig. 1, the LNG Gas supply system for the dual-fuel marine engine according to the first embodiment of the present invention can be divided into two parts, according to function, an LNG (Liquefied Natural Gas) high-pressure Gas supply system and a BOG (Boil of Gas) processing system, wherein the LNG high-pressure Gas supply system supplies Gas to the marine main engine at a Gas supply pressure of about 300bar, and the BOG processing system supplies Gas to the marine auxiliary engine at a Gas supply pressure of about 6 bar; the LNG storage device can be divided into four parts, namely LNG filling, LNG storage, LNG gas supply and exhaust aftertreatment according to the structure.
Further, the LNG gas supply system for the dual-fuel marine engine of the present embodiment includes a port filling receiving device 1, a starboard filling receiving device 2, an LNG storage tank 3, a natural gas day 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 valve group device 12, a marine main engine 13, an auxiliary W/G (water/glycol) circulation system 14, a main W/G circulation system 15, a submerged pump 31, an auxiliary engine gas header 81, a first coil 82, a first tail gas catalytic device 83, an auxiliary exhaust pipe 86, a main engine gas header 131, a second coil 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 port filling and receiving device 1 and the starboard filling and receiving device 2 are both communicated with an LNG storage tank 3; the immersed pump 31 is arranged at the bottom position in 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 marine 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 marine main engine 13, 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 collection box 131, the second coil 132 is disposed in the main engine gas collecting tank 131, an outlet of the second three-way valve 151 is divided into two paths, one path is communicated with an inlet of the second coil 132, an outlet of the second coil 132 is communicated with an intermediate heating medium inlet of the high-pressure gasification device 10, the other path is bypassed with an outlet of the second coil 132 through a second bypass pipeline 142, and an intermediate heating medium outlet of the high-pressure gasification device 10 is communicated with an inlet of the main W/G circulation system 15.
The top outlet of the LNG storage tank 3 is communicated with the inlet of a natural gas day tank 4, the outlet of the natural gas day tank 4 is communicated with the BOG inlet of a low-pressure gasification device 5, the BOG outlet of the low-pressure gasification device 5 is communicated with the inlet of a low-pressure buffer tank 6, the outlet of the low-pressure buffer tank 6 is communicated with the inlet of a marine auxiliary engine 8 through an auxiliary valve group device 7, the exhaust gas outlet of the marine auxiliary engine 8 is communicated with a first exhaust gas catalytic device 83, the first exhaust gas catalytic device 83 is arranged in an auxiliary engine gas collection box 81, an auxiliary exhaust pipe 86 is communicated with the auxiliary engine gas collection box 81, the outlet of an auxiliary W/G circulating system 14 is communicated with the inlet of a first three-way valve 141, a first coil 82 is arranged in the auxiliary engine gas collection box 81, the outlet of the first three-way valve 141 is divided into two paths, one path is communicated with the inlet of the first coil 82, the outlet of the, the other bypass is bypassed to the outlet of the first coil 82 via a first bypass line 152, and the intermediate heating medium outlet of the low-pressure vaporizer 5 is communicated to the inlet of the auxiliary W/G cycle system 14.
Specifically, the marine main engine 13 may be a high-pressure two-stroke low-speed engine, and the marine auxiliary engine 8 may be a low-pressure two-stroke medium-speed engine, but is not limited thereto.
One of the outlet pipelines of the immersed pump 31 is communicated with the top of the LNG storage tank 3, and the purpose of the arrangement is as follows: in some working conditions, the LNG flow output by the immersed pump 31 under the minimum power is larger than the LNG flow required by the marine main engine 13, so that the LNG backflow can be realized, and methane leakage caused by incomplete combustion of the marine main engine 13 is avoided.
The port filling and receiving device 1 and the starboard filling and receiving device 2 are both communicated with the LNG storage tank 3, and specifically comprise: the port filling and receiving device 1 and the starboard filling and receiving device 2 are respectively provided with an outlet and an inlet, the outlet of the port filling and receiving device 1 is converged with the outlet of the starboard filling and receiving device 2 and then is respectively communicated with the top position and the bottom position in the LNG storage tank 3, and the inlet of the port filling and receiving device 1 is converged with the inlet of the starboard filling and receiving device 2 and then is communicated with the top of the LNG storage tank 3. Because the volume of the ship is large, and the ship is in shore sometimes, the bow is in shore sometimes, and sometimes, the stern is in shore sometimes, so that the filling receiving devices are respectively arranged at the bow and the stern to facilitate filling LNG for the ship. The outlets of the port and starboard fill receivers 1 and 2 are used to fill the LNG tank 3 with LNG, while LNG gradually occupies the space in the LNG tank 3 during the filling of LNG, resulting in an increase in the pressure in the LNG tank 3, and the inlets of the port and starboard fill receivers 1 and 2 are used to discharge the gas in the LNG tank 3 and reduce the pressure in the tank 3, so that the pressure in the tank 3 is maintained within a predetermined range.
Furthermore, a first automatic control valve 33 is arranged on a pipeline which is communicated with the top position in the LNG storage tank 3 after an outlet of the port filling and receiving device 1 is converged with an outlet of the starboard filling and receiving device 2, a second automatic control valve 34 is arranged on a pipeline which is communicated with the bottom position in the LNG storage tank 3 after an outlet of the port filling and receiving device 1 is converged with an outlet of the starboard filling and receiving device 2, a third automatic control valve 35 is arranged on a pipeline which is communicated with the top of the LNG storage tank 3 after an inlet of the port filling and receiving device 1 is converged with an inlet of the starboard filling and receiving device 2, a fourth automatic control valve 36 is arranged on a pipeline which is communicated with an inlet of the natural gas daily tank 4 at a top outlet of the LNG storage tank 3, a fifth automatic control valve 37 is arranged on a pipeline which is communicated with an outlet of the immersed pump 31 and an inlet of the high pressure pump system 9, a sixth automatic control valve 38 is arranged on a pipeline which is communicated, a seventh automatic control valve 41 is arranged on a pipeline for communicating an outlet of the natural gas daily tank 4 with a BOG inlet of the low-pressure gasification device 5, an eighth automatic control valve 62 is arranged on a pipeline for communicating an outlet of the low-pressure buffer tank 6 with the auxiliary valve bank device 7, a ninth automatic control valve 91 is arranged on a pipeline for communicating an outlet of the high-pressure pump system 9 with a natural gas inlet of the high-pressure gasification device 10, a tenth automatic control valve 113 is arranged on a pipeline for communicating an outlet of the high-pressure buffer device 11 with the main valve bank device 12, and an eleventh automatic control valve 112 is arranged on a pipeline for converging an outlet of the high-pressure buffer device 11 with a waste gas outlet of the.
Further, the LNG gas supply system for the dual fuel marine engine further includes the compressed air system 16 simultaneously communicating with the first automatic control valve 33, the second automatic control valve 34, the third automatic control valve 35, the fourth automatic control valve 36, the fifth automatic control valve 37, the sixth automatic control valve 38, the seventh automatic control valve 41, the eighth automatic control valve 62, the ninth automatic control valve 91, the tenth automatic control valve 113, and the eleventh automatic control valve 112. Since the respective control valves are pneumatic valves, the respective control valves need to be driven and controlled to open and close by the compressed air system 16.
Furthermore, a first turbocharger 85 is arranged on the auxiliary engine exhaust pipe 86, a second turbocharger 135 and a gas detection device 136 are arranged 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.
Specifically, turbochargers are used to increase the intake air quantity of an engine by compressing air, thereby increasing the output power of the engine. The gas detection device 136 is used for detecting NO of exhaust gas in a main engine exhaust pipe 137 of the marine main engine 13XAnd controls the eleventh automatic control valve 112 according to the detection result to adjust the amount of the natural gas (mainly methane) in the high pressure buffer device 11 directly entering the second exhaust gas catalytic device 133, so that methane and NO are addedXMore complete reaction, thereby reducing methane and NOXAnd (4) discharging. The exhaust gas from the marine auxiliary engine 8 contains methane and NOXThe content generally reaches the standard, so a gas detection device does not need to be arranged in the treatment system of the exhaust gas of the marine auxiliary engine 8, meanwhile, the low-pressure buffer tank 6 does not need to directly provide natural gas for the first exhaust gas catalytic device 83, and the first exhaust gas catalytic device 83 further reduces methane and NO in the exhaust gas of the marine auxiliary engine 8XThe function of the content.
Further, the low pressure buffer tank 6 is provided with a first temperature sensor 61, and the first temperature sensor 61 is in signal connection with the first three-way valve 141 and is used for controlling the first three-way valve 141 so as to adjust the flow rate of the intermediate heating medium inside the auxiliary W/G circulation system 14 through the first bypass line 142. The high pressure buffer device 11 is provided with a second temperature sensor 111 and a pressure sensor 114, and the second temperature sensor 111 is in signal connection with a second three-way valve 151 and is used for controlling the second three-way valve 151 so as to adjust the flow rate of the intermediate heating medium inside the host W/G circulation system 15 through a second bypass pipeline 152. The pressure sensor 114 is in signal connection with the high pressure pumping system 9 and is used for controlling the high pressure pumping system 9 to adjust the pressure of the natural gas after passing through the high pressure pumping system 9. Be equipped with detection device 32 on LNG storage tank 3, detection device 32 is used for monitoring temperature, pressure and the liquid level in the LNG storage tank 3.
Further, the auxiliary W/G circulation system 14 further includes a first expansion tank (not shown) and a first water pump (not shown), and the main W/G circulation system 15 further includes a second expansion tank (not shown) and a second water pump (not shown). The first water pump and the second water pump are used for conveying the intermediate heating medium in a pressurized mode, and the first expansion cabinet and the second expansion cabinet are used for supplementing the intermediate heating medium lost due to evaporation and leakage, so that the first water pump and the second water pump have enough suction pressure heads. Of course, the intermediate heating medium may be other low freezing point solution besides the ethylene glycol aqueous solution in the embodiment, and is not limited herein.
Preferably, in the present embodiment, both the first exhaust gas catalytic device 83 and the second exhaust gas catalytic device 133 adopt Cu/Fe/Al2O3Cordierite/cordierite as catalyst. By adopting HC-SCR catalytic reaction (HC-SCR technology is that HC compound, such as unburned and complete HC in exhaust gas or fuel diesel oil is used as reducing agent, NO in exhaust gas is converted into NOx under the action of catalystXReduction to N2The reaction formula is as follows: CH (CH)4+NOX→N2+CO2+H2O) catalyst used, comparative NH3SCR catalytic reaction (NH)3The SCR technology is to generate NH after urea undergoes hydrolysis and pyrolysis reaction at high temperature3Using NH on the surface of the catalyst3Reduction of NOXGenerating N2Excess NH3Is also oxidized to N2) Required V2O5/TiO2The series of catalysts have the advantages of lower cost and wider operation temperature window.
Preferably, in this embodiment, the main engine gas header 131 and the auxiliary engine gas header 81 are both configured to be separated from each other, the left side of the main engine gas header 131 is provided with a heating and exhaust gas catalytic device, the right side of the main engine gas header 81 is an empty tank, the left side and the right side of the auxiliary engine gas header 81 are communicated with each other and connected through the first flange 84, and the left side and the right side of the main engine gas header 131 are communicated with each other and connected through the second flange 134. The purpose of this is to: 1. the device is convenient to disassemble, assemble and maintain, and elements such as the coil pipe, the tail gas catalytic device and the like are arranged on the left side of the engine gas collecting tank, so that when equipment fails, the flange can be directly disassembled to open the engine gas collecting tank, and the elements in the engine gas collecting tank can be maintained; 2. the assembly of elements is facilitated, and during assembly, the elements can be assembled on the left side of the engine gas collecting tank firstly, and then the left side and the right side of the engine gas collecting tank are connected through flanges.
Preferably, the first exhaust gas catalytic device 83 and the second exhaust gas catalytic device 133 are both vertically arranged, the exhaust gas outlet of the marine auxiliary engine 8 is communicated with the top inlet of the first exhaust gas catalytic device 83, and the outlet of the high-pressure buffer device 11 is communicated with the top inlet of the second exhaust gas catalytic device 133 after being merged with the exhaust gas outlet pipeline of the marine main engine 13. The purpose of setting up like this can make engine exhaust gas from last to running through exhaust catalytic unit down, makes the reaction more complete.
The main working flow of the invention is as follows:
1. LNG high pressure gas supply system: in the engine gas mode, the fifth automatic control valve 37 is opened, the immersed pump 31 is operated, the immersed pump 31 pressurizes and delivers the LNG in the LNG tank 3 to the high-pressure pump system 9, and the return flow of the LNG is achieved by opening the sixth automatic control valve 38. After the LNG enters the high pressure pump system 9, the high pressure pump system 9 further pressurizes the LNG to make the gas supply pressure meet the gas supply requirement of the marine main engine 13.
The high-pressure gasification device 10 is a heat exchange device adopting an intermediate heating medium, the high-temperature engine exhaust gas collected in the main engine gas collection tank 131 is used as a heat source in the intermediate heating process, the intermediate heating medium is conveyed into the main engine gas collection tank 131 from the second expansion cabinet through the second water pump, the main engine gas collection tank 131 is internally provided with a second coil pipe 132, the intermediate heating medium exchanges heat with the high-temperature engine exhaust gas through the second coil pipe 132 to realize temperature rise, the heated intermediate heating medium is conveyed to an intermediate heating medium inlet of the high-pressure gasification device 10 to exchange heat with LNG, the LNG is heated, and meanwhile, the LNG is converted from a liquid state to a gaseous natural gas state. And the intermediate heating medium returns to the second expansion cabinet through the intermediate heating medium outlet of the high-pressure gasification device 10, namely, the intermediate heating medium circularly flows in the main machine W/G circulating system 15, and continuously exchanges heat with the LNG to heat the LNG.
The heated natural gas enters the high-pressure buffer device 11, a second temperature sensor 111 and a pressure sensor 114 are arranged on the high-pressure buffer device 11, the second temperature sensor 111 is used for controlling a second three-way valve 151, and the temperature regulation of heat exchange is realized by regulating the flow of an intermediate heating medium of a second bypass pipeline 152 in the host W/G circulating system 15; when the temperature of the natural gas in the high-pressure buffer device 11 is lower than the required temperature of the marine main engine 13, the second three-way valve 151 is adjusted to enable more intermediate heating medium to be led to the second coil 132 for heat exchange, and when the temperature of the natural gas in the high-pressure buffer device 11 is higher than the required temperature of the marine main engine 13, the second three-way valve 151 is adjusted to enable more intermediate heating medium to directly pass through the second bypass pipeline 152 in the main engine W/G circulating system 15, so that the temperature of the natural gas finally reaches the required temperature of the marine main engine 13. The pressure sensor 114 is used for controlling the high-pressure pump system 9, when the pressure of the natural gas in the high-pressure buffer device 11 is lower than the required pressure of the marine main engine 13, the high-pressure pump system 9 is adjusted to pressurize the LNG, and when the pressure of the natural gas in the high-pressure buffer device 11 is higher than the required pressure of the marine main engine 13, the high-pressure pump system 9 is adjusted to depressurize the LNG, so that the pressure of the natural gas reaches the required pressure of the marine main engine 13.
The natural gas in the high-pressure buffer device 11 is output in two paths after temperature adjustment and pressure adjustment, one path enters the marine main engine 13 through the main valve group device 12 for the marine main engine 13 to use, and the other path is converged with the waste gas outlet pipeline of the marine main engine 13 and then communicated with the second tail gas catalytic device 133. When the marine main engine 13 is running, the tenth automatic control valve 113 is opened, natural gas enters the main valve group device 12, and the intake flow and pressure of the natural gas are adjusted according to the running working condition of the marine main engine 13.
The second exhaust gas catalytic device 133 in the main engine gas collecting tank 131 receives the exhaust gas from the marine main engine 13 and the natural gas from the high pressure buffer device 11 at the same time, and a small amount of unburned natural gas enters the second exhaust gas catalytic device 133 along with the exhaust gas due to the valve overlap angle of the marine main engine 13, and NO in the exhaust gasXReacts with a small amount of residual natural gas and natural gas from the high-pressure buffer device 11 in the second tail gas catalytic device 133 to generate N2、CO2And H2O。
The exhaust gas enters the host exhaust pipe 137 after reaction, the host exhaust pipe 137 is provided with a gas detection device 136, and the gas detection device 136 is used for detecting NO in the exhaust gasXThe eleventh automatic control valve 112 is controlled according to the detection result of the gas detection device 136, so that the amount of the natural gas in the high-pressure buffer device 11 directly entering the second tail gas catalytic device 133 is controlled, and the natural gas and NO are enabled to be mixedXThe reaction is more complete, and the methane and NO are greatly reducedXAnd (4) discharging.
2. BOG processing system: as the heat exchange between the LNG tank 3 and the outside increases, the BOG in the LNG tank 3 gradually increases, the pressure in the LNG tank 3 also increases, and when the pressure increases to a certain degree, the fourth automatic control valve 36 is opened, and the BOG is stored in the natural gas day tank 4.
When the marine auxiliary engine 8 runs, the seventh automatic control valve 41 is opened, and the BOG in the natural gas daily tank 4 enters the low-pressure gasification device 5 for heat exchange and temperature rise. The low-pressure gasification device 5 is a heat exchange device adopting an intermediate heating medium, the high-temperature engine exhaust gas collected in an auxiliary engine gas collection tank 81 is used as a heat source in the intermediate heating process, the intermediate heating medium is conveyed into the auxiliary engine gas collection tank 81 from a first expansion cabinet through a first water pump, a first coil 82 is arranged in the auxiliary engine gas collection tank 81, the intermediate heating medium exchanges heat with the high-temperature engine exhaust gas through the first coil 82 to realize temperature rise, the heated intermediate heating medium is conveyed to an intermediate heating medium inlet of the low-pressure gasification device 5 to exchange heat with the BOG, the temperature of the BOG is raised, and the temperature of the BOG reaches the required temperature of the ship auxiliary engine 8. And the intermediate heating medium returns to the first expansion cabinet through an intermediate heating medium outlet of the low-pressure gasification device 5, namely, the intermediate heating medium circularly flows in the auxiliary W/G circulating system 14, and continuously exchanges heat with the BOG to heat the BOG. It should be noted that, because the requirement for the supply pressure of the marine auxiliary engine 8 is low, the boost of the BOG can be realized by the self-boost of the LNG tank 3, so that the supply pressure requirement of the marine auxiliary engine 8 can be satisfied without providing a related pressurizing device in the BOG processing system.
The BOG after temperature rise enters a low-pressure buffer tank 6, a first temperature sensor 61 is arranged on the low-pressure buffer tank 6, the first temperature sensor 61 is used for controlling a first three-way valve 141, and the temperature regulation of heat exchange is realized by regulating the flow of a middle heating medium of a first bypass pipeline 142 in an auxiliary W/G circulating system 14; when the temperature of the BOG in the low-pressure buffer tank 6 is lower than the required temperature of the marine auxiliary engine 8, the first three-way valve 141 is adjusted to enable more intermediate heating medium to be led to the first coil 82 for heat exchange, and when the temperature of the BOG in the low-pressure buffer tank 6 is higher than the required temperature of the marine auxiliary engine 8, the first three-way valve 141 is adjusted to enable more intermediate heating medium to directly pass through the first bypass pipeline 142 in the auxiliary W/G circulating system 14, and finally the temperature of the BOG reaches the required temperature of the marine auxiliary engine 8.
The BOG in the low-pressure buffer tank 6 is subjected to temperature adjustment and then enters the marine auxiliary engine 8 through the auxiliary valve group device 7 to be used by the marine auxiliary engine 8, when the marine auxiliary engine 8 runs, the eighth automatic control valve 62 is opened, the BOG enters the auxiliary valve group device 7, and the air intake flow and the pressure of the BOG are adjusted according to the running working condition of the marine auxiliary engine 8.
The first exhaust gas catalytic device 83 in the auxiliary engine gas header 81 receives the exhaust gas from the marine auxiliary engine 8, and a small amount of unburned natural gas enters the first exhaust gas catalytic device 8 along with the exhaust gas due to the valve overlap angle of the marine auxiliary engine 83, NO in the exhaust gasXReacts with a small amount of residual natural gas in a first tail gas catalytic device 83 to generate N2、CO2And H2O, greatly reduces methane and NOXAnd (4) discharging. The exhaust gas from the marine auxiliary engine 8 contains methane and NOXThe content generally reaches the standard, so a gas detection device does not need to be arranged in the treatment system of the exhaust gas of the marine auxiliary engine 8, meanwhile, the low-pressure buffer tank 6 does not need to directly provide natural gas for the first exhaust gas catalytic device 83, and the first exhaust gas catalytic device 83 further reduces methane and NO in the exhaust gas of the marine auxiliary engine 8XThe function of the content.
Second embodiment
As shown in fig. 2, the LNG gas supply system for a dual-fuel marine engine according to the second embodiment of the present invention has substantially the same configuration as that of the first embodiment, and is different in the configurations of the auxiliary engine gas header 81 and the main engine gas header 131.
Specifically, in the present embodiment, the auxiliary engine gas header 81 and the main engine gas header 131 are both integrated, and meanwhile, the auxiliary engine gas header 81 is provided with a first manhole 87, and the main engine gas header 131 is provided with a second manhole 138. When the auxiliary engine gas collecting tank 81 or the main engine gas collecting tank 131 needs to be overhauled, the first manhole 87 or the second manhole 138 is opened, and then an operator enters the auxiliary engine gas collecting tank 81 or the main engine gas collecting tank 131 for overhauling. The structures of the auxiliary engine header 81 and the main engine header 131 are not limited herein.
In order to verify the using effect of the LNG supply system of the dual-fuel ship engine provided by the invention, a real ship test is specially carried out on a ship A provided with a low-speed machine 13 and a medium-speed machine 8.
When the ship A operates in a gas mode, the immersed pump 31 pressurizes LNG in the LNG storage tank 3 to a certain pressure and conveys the LNG to the high-pressure pump system 9, the LNG enters the high-pressure gasification device 10 after being pressurized again, the LNG is gasified into natural gas, the pressure and the temperature of the natural gas are adjusted to the range required by the low-speed machine 13 and stored in the high-pressure buffer device 11, and the natural gas passes through the high-pressure buffer deviceThe punch device 11 is used for a low-speed machine. The exhaust gas of the low-speed engine 13 enters a second tail gas catalytic device 133 arranged in a gas collecting box 131 of the main engine, and CH in the exhaust gas4With NOXCatalytic reduction reaction is carried out, and NO in exhaust gas is detectedXIn the amount of natural gas to be added to realize NOXThe emission reaches the standard and no methane escapes. By comparison with the conventional high-pressure LNG supply system, NO in the exhaust gas of the low-speed engine 13 of the ship a is foundXIs lower and can reach the third stage emission standard and no methane escapes from the exhaust.
Meanwhile, when the ship A operates in a gas mode, the BOG in the LNG storage tank 3 enters the natural gas day tank 4, is pressurized to a certain pressure and enters the low-pressure gasification device 5, the pressure and the temperature of the BOG are adjusted to the range required by the medium-speed engine 8 and are stored in the low-pressure buffer tank 6, and the BOG is supplied to the medium-speed engine 8 through the low-pressure buffer tank 6 for use. The exhaust gas of the medium-speed engine 8 enters a first exhaust gas catalytic device 83 arranged in an auxiliary engine gas collecting box 81, and CH in the exhaust gas4With NOXCatalytic reduction reaction is carried out to greatly reduce the methane escape value of the intermediate speed machine 8 and effectively reduce NOXThe emission value of (c). By comparison with the conventional BOG treatment system, NO in the exhaust gas of the medium speed engine 8 of the ship A is foundXAnd methane slip is greatly reduced.
The invention has the advantages that:
1. the exhaust heat of the engine is utilized, and the use of a high-temperature heat source is reduced. The intermediate heating medium adopted by the invention uses the engine exhaust gas as a heat source, the use of high-temperature heat sources such as steam and the like can be reduced, and meanwhile, the amount of the intermediate heating medium entering the gas collection tank of the engine is adjusted by controlling a three-way valve in an intermediate heating medium circulating system so as to control the temperature of natural gas in a buffer tank to meet the requirement of the engine;
2. the tail gas catalytic device is arranged in the gas collection box of the engine, so that the content of methane and nitrogen oxide in the waste gas can be reduced. The dual-fuel engine has an overlap angle of an air valve, a small amount of methane can be discharged to the atmosphere along with the waste gas, and the catalytic reaction device is arranged in an exhaust system to realize NO in the methane and the waste gasXReacting while setting NO in the exhaust lineXMeans for detecting the amount of NOXThe natural gas with increased content enters a catalytic reaction device to ensure that NO in the waste gasXThe content is reduced to the set value. In addition, the HC-SCR catalytic reaction adopted by the invention selects Cu/Fe/Al2O3Cordierite as catalyst, compare NH3V required for the SCR reaction2O5/TiO2The catalyst has lower cost and wider operation temperature window;
3. the engine gas collection box adopts a structure which is arranged in a left-right split manner, the left side is provided with a heating and tail gas catalyzing device, the right side is an empty box, and the left side and the right side are connected through flanges, so that the engine gas collection box is convenient to disassemble, assemble and maintain.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

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).
CN202010578537.1A 2020-06-23 2020-06-23 LNG (liquefied Natural gas) supply system for dual-fuel ship engine Pending CN111594746A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113623531A (en) * 2021-08-31 2021-11-09 沪东重机有限公司 Standard tank type high-pressure pump air supply system with transition storage tank and working method thereof
CN114110422A (en) * 2022-01-25 2022-03-01 中海油能源发展股份有限公司采油服务分公司 LNG ship debugging ship and debugging method
CN114440134A (en) * 2022-01-24 2022-05-06 长江三星能源科技股份有限公司 Integrated compact LNG gas supply system ethylene glycol water heat transfer sled dress equipment
CN114687891A (en) * 2022-03-04 2022-07-01 广州船舶及海洋工程设计研究院（中国船舶工业集团公司第六0五研究院） Ship LNG (liquefied Natural gas) gasification system
CN114754289A (en) * 2022-05-07 2022-07-15 威海中远海运重工科技有限公司 LNG ship low-pressure gas supply system and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113623531A (en) * 2021-08-31 2021-11-09 沪东重机有限公司 Standard tank type high-pressure pump air supply system with transition storage tank and working method thereof
CN114440134A (en) * 2022-01-24 2022-05-06 长江三星能源科技股份有限公司 Integrated compact LNG gas supply system ethylene glycol water heat transfer sled dress equipment
CN114110422A (en) * 2022-01-25 2022-03-01 中海油能源发展股份有限公司采油服务分公司 LNG ship debugging ship and debugging method
CN114110422B (en) * 2022-01-25 2022-04-12 中海油能源发展股份有限公司采油服务分公司 LNG ship debugging ship and debugging method
CN114687891A (en) * 2022-03-04 2022-07-01 广州船舶及海洋工程设计研究院（中国船舶工业集团公司第六0五研究院） Ship LNG (liquefied Natural gas) gasification system
CN114687891B (en) * 2022-03-04 2024-02-23 广州船舶及海洋工程设计研究院（中国船舶工业集团公司第六0五研究院） Ship LNG gasification system
CN114754289A (en) * 2022-05-07 2022-07-15 威海中远海运重工科技有限公司 LNG ship low-pressure gas supply system and method

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