CN104763555A - System and method for reducing temperature of cooling water of gas engine through LNG (Liquefied Natural Gas) cold energy - Google Patents
System and method for reducing temperature of cooling water of gas engine through LNG (Liquefied Natural Gas) cold energy Download PDFInfo
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- CN104763555A CN104763555A CN201510077319.9A CN201510077319A CN104763555A CN 104763555 A CN104763555 A CN 104763555A CN 201510077319 A CN201510077319 A CN 201510077319A CN 104763555 A CN104763555 A CN 104763555A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention belongs to the field of gas engines and particularly relates to a system and a method for reducing the temperature of the cooling water of a gas engine through the LNG (Liquefied Natural Gas) cold energy. A large circulation supply pipeline and a small circulation pipeline are arranged in an LNG supply system and a large circulation heat exchanger and a small circulation heat exchanger are arranged in the two pipelines in an additional mode respectively; the temperature of the circulating water can be reduced through the LNG cold energy and the self-temperature of the circulating water is utilized through each heat exchanger to serve as an LNG gasifier; the two-stage utilization on the LNG cold energy is achieved due to the fact that an engine cooling system is corresponding to different working conditions of the engine and accordingly the rapid use on the gas supply of the gas engine and the temperature of the cooling water is facilitated so as to achieve the dynamic balance. The gas engine which is modified from a diesel engine is simple in modification, high in cold energy utilization rate and broad in application prospect.
Description
Technical field
The invention belongs to natural gas engine field, particularly relate to the system of natural gas engine LNG cold energy use and gasification thereof.
Background technique
China's oil resource moves towards exhausted gradually, and motor vehicle exhaust emission is polluted and day by day increased the weight of, and natural gas engine is developed rapidly in China.Wherein natural gas engine more options with the formation of liquified natural gas by fuel storage in LNG storage tank, because LNG annotates, the time is short, the rock gas of the automobile-used storage tank loading of LNG of the large same volume of energy per volume density is about 3 times of CNG air cylinder, therefore LNG automobile can meet the needs of long-distance running.Simultaneously LNG pressure store be 1.6MPa, CNG pressure store higher than LNG, reach 20MPa.LNG pump extracts the LNG Liquefied natural gas of-162 DEG C out from storage tank, and LNG Liquefied natural gas pressure is increased to 7.0-10.0MPa, and temperature is increased to-158.0--151.6 DEG C, and this just makes to need to install gasification installation and regulator etc. additional in LNG supply pipeline.Article " discussion to Railway Project in L N G cold energy use " points out that high pressure LNG has the cold energy of different potential temperature in this temperature range from 120K to normal temperature, makes full use of, just can obtain maximum benefit if can be divided into multistage under different potential temperatures.
What commonly use in LNG Liquefied natural gas supply system is water bath type gasifier.On the one hand LNG cold energy can be used for reducing the temperature of cycle of engine cooling water, on the other hand engine cooling water heat LNG is heated, gasification.Employing water bath type vaporizer more fully can ensure heat exchange efficiency and compact structure takes up an area little, and price is low.The LNG Liquefied natural gas of low temperature is through being vaporized into applicable temperature supply engine later.Outside is that a sleeve pipe is connected to form closed loop as the shell side of heat exchanger and the cooling water system of motor car engine.The cooling water that housing secures flows therebetween can not leak.
Patent CN102423997 A proposes a kind of air-conditioning system of the automobile utilizing liquefied natural gas vaporization latent heat solid line excessively cold, it is characterized in that installing one section of LNG heat exchanging tube additional on common air-conditioning work cycle pipeline, utilize LNG cold to increase the Subcoold temperature of refrigeration agent at condensator outlet, reduce compressor wasted work.But LNG temperature is-162 DEG C, air-conditioner temperature refrigeration problem fluctuates to 30 degree at tens degree, low to cryogenic energy utilization rate.Patent CN 101326410 B proposes a kind of Multi-circuit refrigerant systems using different refrigeration agent, comprises many pipelines with different refrigeration agent.The application that the environment space that controller optionally mates perception regulates, for being optionally connected with many pipelines.Often kind of refrigeration agent can provide efficiency benefit in indicated temperature scope.A pipeline can be filled with a kind of refrigeration agent, and it is utilized at higher ambient temperatures best, and other pipeline can have compared with a kind of refrigeration agent be utilized best under low ambient temperature.The controller monitoring ambient temperature of system, and in order, utilize two pipelines according to the ambient temperature of perception.This invention needs to provide different refrigeration agent, and onboard system is difficult to application.Patent CN 101746840 B proposes the system that a kind of LNG of utilization cold energy carries out desalination of sea water.Its essence utilizes the heat energy of water and reaction house property to the LNG that vaporizes, and application principle is close with patent CN102423997 A.Patent CN 202812795 U proposes a kind of LNG cold energy recycle system, realizes multi-stage multi-pipe road LNG heat exchange design, improves the working life of LNG vaporizer to a certain extent, but the heat exchange between the one the second pipelines exists certain loss of refrigeration capacity.
Summary of the invention
For Shortcomings in prior art, the invention provides a kind of system utilizing LNG cold energy to reduce natural gas engine cooling water temperature, natural gas engine cooling water heat can be utilized using LNG gasification for gaseous natural gas is as fuel simultaneously.
The combustion temperature of natural gas engine on average exceeds 100 DEG C-150 DEG C than the combustion temperature with diesel engine, therefore the heat load of motor significantly increases, make the cooling system of existing diesel can be applied to natural gas engine to get on, the heat load of natural gas engine cooling system must be reduced.On the other hand, in each air feed circulation of In-cylinder Direct Injection CNG Engine, air demand is much larger than the natural gas engine of intake duct low-pressure fuel injection, so had again larger requirement to LNG supply capacity.The present invention agrees with above-mentioned 2 points, utilizes LNG cold energy to reduce engine cooling circulating water temperature; Utilize engine cooling circulating water heat gasification LNG, and mutually can regulate along with engine load size, formative dynamics balances.
The present invention realizes above-mentioned technical purpose by following technological means.
Utilize LNG cold energy to reduce a system for natural gas engine cooling water temperature, comprise LNG supply system, engine-cooling system and engine body are formed.
Described engine-cooling system comprises radiator, fan, thermostat, discharging valve, water pump, distributed water pipe, water jacket, and wherein thermostat controls the selection of large and small cycles pipeline.
Described engine body comprises driving belt, drive wheel, oil sump, flywheel; Engine running power is by driving belt, and drive wheel is passed to fan, water pump and flywheel.
Described LNG supply system by LNG storage tank, high-pressure shut-off, manually-operated gate, LNG major cycle supply pipeline, three-way valve, knock out drum, natural gas straight spraying nozzle form; LNG storage tank successively with high-pressure shut-off, manually-operated gate, LNG major cycle supply pipeline, three-way valve, knock out drum, natural gas straight spraying nozzle is connected by pipeline;
Described LNG supply system also comprises LNG short circle supply pipeline, described in have LNG short circle supply pipeline to be located between manually-operated gate and three-way valve.
The artificial opening and closing of described manually-operated gate, described high-pressure shut-off cuts off contacting between LNG storage tank and LNG supply pipeline automatically when the abnormal increase of loine pressure.
Also be provided with pressure regulator valve between three-way valve and knock out drum, after the natural gas via pressure regulator valve pressure regulation in pipeline, enter knock out drum.
Described three-way valve, pressure regulator valve, the pressure transducer that knock out drum is arranged, natural gas straight spraying nozzle, thermostat, is all electrically connected with ECU, is controlled by ECU.
Described LNG major cycle pipeline comprises pipeline A1, A2, is connected to major cycle heat exchanger between described A1 and A2, the inner LNG pipeline of described major cycle heat exchanger around major cycle cooling water pipeline, forced heat exchanging;
Described LNG short circle pipeline comprises pipeline B1, B2, is connected to short circle heat exchanger between described B1 and B2, the inner LNG pipeline of described short circle heat exchanger around short circle cooling water pipeline, forced heat exchanging.
In such scheme, LNG cold energy two grade utility under the corresponding Under Different Work Condition of Engine of described engine-cooling system, is conducive to the air demand and the cooling water temperature that use rapidly natural gas engine, reaches transient equiliblium.
Natural gas engine cold-start phase, needs relatively dense mixed gas and improves cooling water temperature as early as possible.Now engine water temperature is lower than 76 DEG C, three-way valve is in closed condition, LNG is through short circle pipeline B1, enter short circle heat exchanger and enter short circle pipeline B2 subsequently, thermostat cuts out the passage that water jacket leads to major cycle cooling water pipeline, by cooling water through short circle heat exchanger, feeding water pump and distributed water pipe enter short circle, send out a machine cooling water temperature and improve rapidly.Further promotion LNG amount of vaporization, the motor for cold start-up provides sufficient gaseous natural gas.
Engine water temperature reaches between 76 DEG C ~ 86 DEG C, illustrate that motor enters normal working, large and small cycles pipeline A2 and B2 opened by three-way valve, now thermostat opens major cycle cooling water pipeline and short circle cooling water pipeline simultaneously, LNG cold energy through major cycle heat exchanger and the heat exchange of short circle heat exchanger two-stage heat exchanger, makes deliverability of gas tend towards stability simultaneously.
When engine water temperature is higher than 86 DEG C, mean that motor enters load and increases, the operating mode that heat load is excessive, need air demand to need significantly to improve, cooling water needs to lower the temperature as early as possible.The LNG that now delivery volume increases enters major cycle heat exchanger, and its cold can accelerating cooling circulating water, reduces the heat load of natural gas engine under high load condition.Three-way valve closedown LNG short circle supply pipeline B2 leads to pressure regulator valve 3 and connects, and open LNG major cycle supply pipeline A2 and be connected with pressure regulator valve 3, major cycle cooling water pipeline opened by thermostat, and cooling water enters radiator, and starting fan reduces cooling water temperature in radiator.Thermostat cuts out short circle pipeline on the left of it, and cooling water directly sends into distributed water pipe through water pump, is conducive to accelerating cooling water circulation speed, promotes the gasification rate of LNG conversely.
Beneficial effect of the present invention is:
The major cycle pipeline of cooling system of the present invention and short circle pipeline, can realize motor LNG cold energy two grade utility under different operating mode, be conducive to the air demand and the cooling water temperature that use rapidly natural gas engine, reach transient equiliblium.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Description of reference numerals is as follows:
1-LNG storage tank, 2-knock out drum, 3-pressure regulator valve, 4-high-pressure shut-off, 5-manually-operated gate, 6-major cycle heat exchanger, 7-three-way valve, 8-radiator, 9-fan, 10-short circle heat exchanger, 11-thermostat, 12-discharging valve, 13-driving belt, 14-water pump, 15-drive wheel, 16-oil sump, 17-flywheel, 18-distributed water pipe, 19-water jacket, 20-natural gas straight spraying nozzle, 21-ECU, A1, A2 are that in major cycle, LNG supply pipeline B1, B2 are LNG supply pipeline in short circle.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
As shown in Figure 1, a kind of system utilizing LNG cold energy to reduce natural gas engine cooling water temperature, comprises LNG supply system, engine-cooling system and engine body.In LNG storage tank 1, pressure is 1.6MPa, and temperature is-162 DEG C, needs liquified natural gas LNG intensification pressure regulation to meet the eject request of rock gas nozzle 20.
Liquified natural gas in LNG storage tank 1 enters major cycle heat exchanger 6 through major cycle LNG supply pipeline A1; Short circle heat exchanger 10 is entered through short circle LNG supply pipeline B1.Before LNG enters any heat exchanger, must by high-pressure shut-off 4 and manually-operated gate 5 automatically to cut off contacting between LNG storage tank 1 and LNG supply pipeline when the abnormal increase of loine pressure.
Two-stage is divided into the utilization of LNG cold energy, is completed by two feed paths.Article 1, be that LNG stream enters major cycle pipeline A1 after manually-operated gate 5, then enter major cycle heat exchanger 6, subsequently again through major cycle pipeline A2, after three-way valve 7, be admitted to pressure regulator valve 3, after pressure regulation, send into knock out drum 2, spray into cylinder finally by nozzle 20.Article 2 is that LNG stream enters short circle pipeline B1 after manually-operated gate 5, then enters short circle heat exchanger 10, subsequently again through short circle pipeline B2, is admitted to pressure regulator valve 3, sends into knock out drum 2 after pressure regulation, spray into cylinder finally by nozzle 20 after three-way valve 7.
The effect of knock out drum 2 is that a certain amount of rock gas gas of deposit prepares against needs when natural gas engine starts, or uses when engine loading sharply changes.
Under original state, thermostat 11 and three-way valve 7 all control by ECU 21, are in closed condition, and namely cooling water major cycle pipeline is closed by thermostat 11, and LNG major cycle pipeline A2 is closed to pressure regulator valve 3 passage by three-way valve 7.
When natural gas engine starts, from knock out drum 2, absorb rock gas enter cylinder acting, now engine cooling water temperature is lower than 76 DEG C, and natural gas engine cooling system enters short circle pattern.Now three-way valve 7 is in closed condition, and LNG, through short circle pipeline B1, enters short circle heat exchanger 10 and enters short circle pipeline B2 subsequently.Short circle heat exchanger 10 design size is relatively little herein, to reduce LNG cold energy heat transfer effect, because motor needs to improve cooling water temperature as early as possible reach warming-up effect.
Natural gas engine cooling water temperature reaches between 76 DEG C ~ 86 DEG C, and now motor enters normal working.Now the passage that water jacket 19 enters major cycle radiator 8 opened by thermostat 11, and fan 9 starts and promotes heat radiation.Now large and small cycles pipeline A2 and B2 opened by three-way valve 7, LNG cold energy is through the heat exchange of large and small cycles two-stage heat exchanger, major cycle heat exchanger 6 place LNG cold energy use rate is high, short circle heat exchanger 10 place's cold energy use rate is low, engine water temperature regional stability is made under acting in conjunction, also make natural gas gasifying amount regional stability, the two reaches transient equiliblium.
When natural gas engine water temperature is higher than 86 DEG C, mean that motor enters load and increases, the operating mode that heat load is excessive, Power output needs to increase air demand on the one hand, and cooling water needs to lower the temperature as early as possible on the other hand.Now thermostat 11 controls short circle water route and no longer flows through pipeline on the left of short circle heat exchanger 10, and cooling water directly enters distributed water pipe 18 after entering water pump 14 by radiator 8.Now three-way valve 7 is closed LNG short circle supply pipeline B2 and is led to pressure regulator valve 3 and connect, and opens LNG major cycle supply pipeline A2 and is connected with pressure regulator valve 3.Now cooling water is all lowered the temperature via the major cycle heat exchanger 6 in major cycle pipeline.Major cycle heat exchanger 6 exchange capability of heat is strong, and cold energy use rate is high, and its cold can accelerating cooling circulating water, reduces the heat load of natural gas engine under high load condition.Cooling water heat promotes LNG gasification, is the more vaporized fuel of natural gas engine supply during high capacity.Along with LNG delivery volume increases, cooling water temperature declines, and LNG amount of vaporization decreases, until LNG delivery volume and cooling water temperature reach the transient equiliblium under normal temperature again.
Described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned mode of execution; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (5)
1. utilize LNG cold energy to reduce the system of natural gas engine cooling water temperature, comprise engine-cooling system and engine body, described engine-cooling system comprises radiator (8), fan (9), thermostat (11), discharging valve (12), water pump (14), distributed water pipe (18), water jacket (19); Described engine body comprises driving belt (13), drive wheel (15), oil sump (16), flywheel (17);
It is characterized in that, also comprise LNG supply system, the LNG storage tank (1) of described LNG supply system, high-pressure shut-off (4), manually-operated gate (5), LNG major cycle supply pipeline, three-way valve (7), knock out drum (2), natural gas straight spraying nozzle (20) is connected successively by pipeline, described LNG supply system also comprises LNG short circle supply pipeline, and described LNG short circle supply pipeline is located between manually-operated gate (5) and three-way valve (7).
2. utilize LNG cold energy to reduce the system of natural gas engine cooling water temperature as claimed in claim 1, it is characterized in that, between described three-way valve (7) and knock out drum (2), be also provided with pressure regulator valve (3).
3. utilize LNG cold energy to reduce the system of natural gas engine cooling water temperature as claimed in claim 1 or 2, it is characterized in that, described three-way valve (7), pressure regulator valve (3), the upper pressure transducer arranged of knock out drum (2), natural gas straight spraying nozzle (20), thermostat (11), equal and ECU(21) be electrically connected.
4. utilize LNG cold energy to reduce the system of natural gas engine cooling water temperature as claimed in claim 1, it is characterized in that, described LNG major cycle pipeline comprises pipeline (A1) and (A2), be connected to major cycle heat exchanger (6) between described pipeline (A1), (A2), the inner LNG pipeline of described heat exchanger (6) is around major cycle cooling water pipeline;
Described LNG short circle pipeline comprises pipeline (B1) and (B2), is connected to short circle heat exchanger (10) between described pipeline (B1), (B2), and the inner LNG pipeline of described heat exchanger (10) is around short circle cooling water pipeline.
5. utilize LNG cold energy to reduce the method for the system of natural gas engine cooling water temperature, it is characterized in that, concrete steps comprise:
(1) when engine water temperature is lower than 76 DEG C, three-way valve (7) is in closed condition, LNG is through short circle pipeline (B1), enter short circle heat exchanger (10) and enter short circle pipeline (B2) subsequently, thermostat (11) cuts out the passage that water jacket (19) leads to major cycle cooling water pipeline, by cooling water through short circle heat exchanger (10), feeding water pump (14) and distributed water pipe (18) enter short circle;
(2) when engine water temperature reaches between 76 DEG C ~ 86 DEG C, large and small cycles pipeline (A2) and (B2) opened by three-way valve (7), thermostat (11) opens major cycle cooling water pipeline and short circle cooling water pipeline simultaneously, and LNG cold energy is simultaneously through major cycle heat exchanger (6) and short circle heat exchanger (10) heat exchange;
(3) when engine water temperature is higher than 86 DEG C, three-way valve (7) is closed LNG short circle supply pipeline (B2) and is led to pressure regulator valve (3) connection, open LNG major cycle supply pipeline (A2) to be connected with pressure regulator valve (3), thermostat (11) cuts out short circle cooling water pipeline, cooling water is through major cycle heat exchanger (6), enter radiator (8), after water pump (14), enter distributed water pipe (18).
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| CN201510077319.9A CN104763555B (en) | 2015-02-13 | 2015-02-13 | The system and method for natural gas engine cooling water temperature is reduced using LNG cold energy |
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| CN201510077319.9A CN104763555B (en) | 2015-02-13 | 2015-02-13 | The system and method for natural gas engine cooling water temperature is reduced using LNG cold energy |
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| CN104763555B CN104763555B (en) | 2017-10-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840350A (en) * | 2016-03-29 | 2016-08-10 | 武汉理工大学 | Water-bath heating device for natural gas engine |
| CN107630770A (en) * | 2017-11-03 | 2018-01-26 | 黄帮义 | Liquified gas automobile air supply system |
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| CN105840350A (en) * | 2016-03-29 | 2016-08-10 | 武汉理工大学 | Water-bath heating device for natural gas engine |
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| CN107630770A (en) * | 2017-11-03 | 2018-01-26 | 黄帮义 | Liquified gas automobile air supply system |
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