CN104763555B - The system and method for natural gas engine cooling water temperature is reduced using LNG cold energy - Google Patents
The system and method for natural gas engine cooling water temperature is reduced using LNG cold energy Download PDFInfo
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- CN104763555B CN104763555B CN201510077319.9A CN201510077319A CN104763555B CN 104763555 B CN104763555 B CN 104763555B CN 201510077319 A CN201510077319 A CN 201510077319A CN 104763555 B CN104763555 B CN 104763555B
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- lng
- engine
- natural gas
- cooling water
- partial circulating
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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
Abstract
The invention belongs to natural gas engine field, and in particular to a kind of utilization LNG cold energy reduces the system and method for natural gas engine cooling water temperature.Systemic circulation feeding pipe and partial circulating feeding pipe are provided with the LNG feed systems of the present invention, two pipelines add large and small cycles heat exchanger respectively；Circulating water temperature is reduced using LNG cold energy, heat exchanger utilizes recirculated water own temperature simultaneously, as LNG gasification device；LNG cold energy two grade utilities under engine-cooling system correspondence Different Work Condition of Engine, are conducive to rapid air demand and cooling water temperature using natural gas engine, reach dynamic equilibrium.The natural gas engine come to diesel engine refitted, repacking is simple, and cold energy use rate is high, with very strong application prospect.
Description
Technical field
The invention belongs to natural gas engine field, more particularly to natural gas engine LNG cold energy uses and its gasification
System.
Background technology
China's oil resource gradually moves towards exhausted, and motor vehicle exhaust emission pollution is increasingly aggravated so that natural gas engine exists
China is developed rapidly.Wherein natural gas engine more options with the formation of liquified natural gas by fuel storage in LNG storage tank
In, because the LNG filling times are short, the natural gas that the automobile-used storage tanks of LNG of the big same volume of energy per volume density are loaded is CNG
3 times or so of gas bomb, therefore the need for LNG automobiles can meet long-distance running.LNG pressure stores are 1.6MPa, CNG storages simultaneously
Pressure is deposited higher than LNG, 20MPa is reached.LNG pump extracts -162 DEG C of liquefied natural gas out from storage tank, by liquefied natural gas pressure
7.0-10.0MPa is increased to, temperature is increased to-158.0-- 151.6 DEG C, this allows for needing to install gasification additional in LNG feeding pipes
Device and regulator etc..Article《Discussion to Railway Project in L N G cold energy uses》Point out that high pressure LNG has from 120K
The cold energy of different potential temperatures, makes full use of if can be divided into multistage under different potential temperatures in normal temperature this temperature range, so that it may
To obtain maximum benefit.
What is commonly used in liquefied natural gas feed system is water bath type gasifier.One side LNG cold energy can be for reduction hair
The temperature of motivation recirculated cooling water, another aspect engine cooling water heat makes LNG heating, gasification.Using water bath type vaporizer
It more can fully ensure that heat exchange efficiency and compact conformation occupation of land be small, price is low.The liquefied natural gas of low temperature through being vaporized into later
Suitable temperature supply engine.Outside is a sleeve pipe as the shell side of heat exchanger and the cooling water system phase of automobile engine
Even form the loop of closure.Shell ensures that the cooling water flowed therebetween will not leak.
Patent CN102423997 A propose a kind of sky of the automobile of utilization liquefied natural gas vaporization latent heat solid line supercooling
Adjusting system, it is characterized in that installing one section of LNG heat exchanger tube additional on common air-conditioning working cycles pipeline, is increased using LNG colds and freezed
Agent reduces compressor wasted work in the degree of supercooling of condensator outlet.But LNG temperature is -162 DEG C, air-conditioner temperature refrigeration problem exists
Ten several years fluctuated to 30 degree, low to cooling capacity utilization rate.The B of patent CN 101326410 propose one kind and use different systems
The Multi-circuit refrigerant systems of cryogen, including a plurality of pipeline with different refrigerants.Controller optionally matches the ring of perception
The application of border Space adjustment, for being optionally connected with a plurality of pipeline.Every kind of refrigerant can be carried in temperature range is indicated
For efficiency benefit.One pipeline can be filled with a kind of refrigerant, and it is best utilized at higher ambient temperatures, and other pipelines
Can have compared with a kind of refrigerant being best utilized under low ambient temperature.The controller monitoring environment temperature of system, and root
Two pipelines are utilized in order according to the environment temperature of perception.The invention needs to provide different refrigerants, difficult on onboard system
To apply.The B of patent CN 101746840 propose a kind of system that desalinization is carried out using LNG cold energy.Its essence is profit
LNG is vaporized with the heat energy of water and reaction house property, application principle is close with patent CN102423997 A.Patent CN
202812795 U propose a kind of LNG cold energy recycles system, realize multi-stage multi-pipe road LNG heat exchange designs, to a certain extent
Improve the service life of LNG gasification device, but there is certain loss of refrigeration capacity in the heat exchange between the one the second pipelines.
The content of the invention
It is cold using LNG cold energy reduction natural gas engine the invention provides one kind for Shortcomings in the prior art
But the system of coolant-temperature gage, while using LNG gasification can be that gaseous natural gas is used as combustion by the use of natural gas engine cooling water heat
Material.
The ignition temperature of natural gas engine is averagely higher by 100 DEG C -150 DEG C, therefore hair than the ignition temperature of same diesel engine
The thermic load of motivation is significantly increased, and to cause the cooling system of existing diesel to be applicable to natural gas engine up, must
The thermic load of natural gas engine cooling system must be reduced.On the other hand, each supply is followed In-cylinder Direct Injection CNG Engine
Air demand is much larger than the natural gas engine of air intake duct low-pressure fuel injection in ring, so there is bigger want again to LNG supply capacity
Ask.The present invention agrees with above-mentioned 2 points, and engine cool circulating water temperature is reduced using LNG cold energy；Circulated using engine cool
Hydro-thermal amount gasification LNG, and can mutually be adjusted with engine load size, form dynamic equilibrium.
The present invention is to realize above-mentioned technical purpose by following technological means.
The system that a kind of utilization LNG cold energy reduces natural gas engine cooling water temperature, including LNG feed systems, start
Machine cooling system and engine body are constituted.
The engine-cooling system include radiator, fan, thermostat, discharging valve, water pump, distributive pipe, water jacket, wherein
Thermostat controls the selection of large and small cycles pipeline.
The engine body includes transmission belt, drive, oil sump, flywheel；Engine operates power by transmission belt, passes
Driving wheel is transferred to fan, water pump and flywheel.
The LNG feed systems are by LNG storage tank, high-pressure shut-off, manually-operated gate, LNG systemic circulation feeding pipes, threeway
Valve, surge tank, natural gas straight spraying nozzle is constituted；LNG storage tank successively with high-pressure shut-off, manually-operated gate, LNG systemic circulation supply pipes
Road, triple valve, surge tank, natural gas straight spraying nozzle is connected by pipeline；
The LNG feed systems also include LNG partial circulating feeding pipes, described to have LNG partial circulatings feeding pipe to be located at hand
Between movable valve and triple valve.
The manually-operated gate is manually opened and closed, and the high-pressure shut-off automatically cuts off LNG storages when loine pressure increases extremely
Contacting between tank and LNG feeding pipes.
The natural gas in pressure regulator valve, pipeline is additionally provided between triple valve and surge tank and enters buffering after pressure regulator valve pressure regulation
Tank.
The pressure sensor set on the triple valve, pressure regulator valve, surge tank, natural gas straight spraying nozzle, thermostat, with
ECU is electrically connected, by ECU controls.
The LNG systemic circulations pipeline includes pipeline A1, A2, and systemic circulation heat exchanger is connected between the A1 and A2, described
LNG pipelines are around systemic circulation cooling water pipeline, enhanced heat exchange inside systemic circulation heat exchanger；
The LNG partial circulatings pipeline includes pipeline B1, B2, and partial circulating heat exchanger is connected between the B1 and B2, described
LNG pipelines are around partial circulating cooling water pipeline, enhanced heat exchange inside partial circulating heat exchanger.
In such scheme, LNG cold energy two grade utilities under the engine-cooling system correspondence Different Work Condition of Engine, favorably
In the air demand and cooling water temperature that use natural gas engine rapidly, dynamic equilibrium is reached.
Natural gas engine cold-start phase, it is necessary to relatively dense gaseous mixture and improve cooling water temperature as early as possible.Now
Engine water temperature be less than 76 DEG C, triple valve is closed, LNG pass through partial circulating pipeline B1, into partial circulating heat exchanger with
Enter small circulating pipe road B2 afterwards, thermostat closes the passage that water jacket leads to systemic circulation cooling water pipeline, cooling water is followed through too small
Ring heat exchanger, feeding water pump and distributive pipe enter partial circulating, and hair machine cooling water temperature is improved rapidly.Further promote LNG gas
Change amount, sufficient gaseous natural gas is provided for the engine of cold start-up.
Engine water temperature is reached between 76 DEG C~86 DEG C, illustrates that engine enters normal operating conditions, triple valve is opened big
Partial circulating pipeline A2 and B2, now thermostat is while open systemic circulation cooling water pipeline and partial circulating cooling water pipeline, LNG
Cold energy exchanges heat by systemic circulation heat exchanger and partial circulating heat exchanger two-stage heat exchanger simultaneously so that deliverability of gas tends to be steady
It is fixed.
Engine water temperature be higher than 86 DEG C when, it is meant that engine enter load increase, the excessive operating mode of thermic load, it is necessary to for
Tolerance needs to greatly improve, and cooling water needs to cool as early as possible.The LNG of now quantity delivered increase enters systemic circulation heat exchanger, and its is cold
Amount can accelerate the thermic load of natural gas engine under cooling circulating water, reduction high load condition.Triple valve closes LNG partial circulatings
Feeding pipe B2 leads to pressure regulator valve 3 and connected, and opens LNG systemic circulation feeding pipe A2 and is connected with pressure regulator valve 3, thermostat is opened and followed greatly
Ring cooling water pipeline, cooling water enters cooling water temperature in radiator, starting fan reduction radiator.It is small that thermostat closes its left side
Circulation line, cooling water is sent directly into distributive pipe through water pump, is conducive to accelerating cooling water circulation speed, promotes LNG's in turn
Gasification rate.
Beneficial effects of the present invention are：
The systemic circulation pipeline and partial circulating pipeline of cooling system of the present invention, it is possible to achieve engine LNG under different operating modes
Cold energy two grade utility, is conducive to rapid air demand and cooling water temperature using natural gas engine, reaches dynamic equilibrium.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Description of reference numerals is as follows：
1-LNG storage tanks, 2- surge tanks, 3- pressure regulator valves, 4- high-pressure shut-offs, 5- manually-operated gates, 6- systemic circulation heat exchangers, 7-
Triple valve, 8- radiators, 9- fans, 10- partial circulating heat exchangers, 11- thermostats, 12- discharging valves, 13- transmission belts, 14- water
Pump, 15- drives, 16- oil sumps, 17- flywheels, 18- distributive pipes, 19- water jackets, 20- natural gas straight spraying nozzles, 21-ECU, A1,
A2 is LNG feeding pipes B1 in systemic circulation, and B2 is LNG feeding pipes in partial circulating.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further illustrated, but protection scope of the present invention is simultaneously
Not limited to this.
As shown in figure 1, the system that a kind of utilization LNG cold energy reduces natural gas engine cooling water temperature, including LNG supplies
System, engine-cooling system and engine body.In LNG storage tank 1, pressure is 1.6MPa, and temperature is -162 DEG C, it is necessary to liquid
State natural gas LNG heats up pressure regulation to meet the eject request of natural gas nozzle 20.
Liquified natural gas in LNG storage tank 1 enters systemic circulation heat exchanger 6 through systemic circulation LNG feeding pipes A1；Through partial circulating
LNG feeding pipes B1 enters partial circulating heat exchanger 10.LNG enters before any heat exchanger, must pass through high-pressure shut-off 4 and hand
Movable valve 5 so as to loine pressure extremely increase when automatically cut off contacting between LNG storage tank 1 and LNG feeding pipes.
Utilization to LNG cold energy is divided into two-stage, is completed by two feed paths.First be LNG stream after manually-operated gate 5
Into systemic circulation pipeline A1, then into systemic circulation heat exchanger 6, then sent again through systemic circulation pipeline A2 after triple valve 7
Enter pressure regulator valve 3, surge tank 2 is sent into after pressure regulation, most spray into cylinder through nozzle 20 afterwards.Article 2 is that LNG stream is laggard through manually-operated gate 5
Enter partial circulating pipeline B1, then into partial circulating heat exchanger 10, then sent again through partial circulating pipeline B2 after triple valve 7
Enter pressure regulator valve 3, surge tank 2 is sent into after pressure regulation, most spray into cylinder through nozzle 20 afterwards.
The effect of surge tank 2 is a certain amount of natural gas gas of deposit in case natural gas engine needs when starting, or sends out
Motivation load is used when drastically changing.
Under original state, thermostat 11 and triple valve 7 are controlled by ECU 21, are closed, i.e., cooling water is followed greatly
Endless tube road is closed by thermostat 11, and LNG systemic circulation pipeline A2 to the passage of pressure regulator valve 3 are closed by triple valve 7.
When natural gas engine starts, absorption natural gas does work into cylinder from surge tank 2, now engine cooling water
Temperature is less than 76 DEG C, and natural gas engine cooling system enters partial circulating pattern.Now triple valve 7 is closed, LNG warps
Too small circulation line B1, partial circulating pipeline B2 is subsequently entered into partial circulating heat exchanger 10.Partial circulating heat exchanger 10 is designed herein
Size is relatively small, to reduce LNG cold energy heat transfer effects, because engine needs to improve cooling water temperature as early as possible and reaches that warming-up is imitated
Really.
Natural gas engine cooling water temperature reaches between 76 DEG C~86 DEG C that now engine enters normal operating conditions.
Now thermostat 11 opens the passage that water jacket 19 enters systemic circulation radiator 8, and fan 9, which starts, promotes radiating.Now triple valve 7 is opened
Open large and small cycles pipeline A2 and B2, LNG cold energy to exchange heat by large and small cycles two-stage heat exchanger, LNG is cold at systemic circulation heat exchanger 6
Energy utilization rate is high, and cold energy use rate is low at partial circulating heat exchanger 10, and engine water temperature regional stability is caused under collective effect, is also made
Natural gas gasifying amount regional stability is obtained, the two reaches dynamic equilibrium.
When natural gas engine water temperature is higher than 86 DEG C, it is meant that engine enters load and increased, the excessive operating mode of thermic load,
One side power output needs to increase air demand, and another aspect cooling water needs to cool as early as possible.Now thermostat 11 controls small follow
Ring water route is no longer flow through the left side pipeline of partial circulating heat exchanger 10, and cooling water is directly entered a point water after the entrance water pump 14 of radiator 8
Pipe 18.The now closing of triple valve 7 LNG partial circulating feeding pipes B2 leads to pressure regulator valve 3 and connected, and opens LNG systemic circulation feeding pipes
A2 is connected with pressure regulator valve 3.Now cooling water all cools via the systemic circulation heat exchanger 6 in systemic circulation pipeline.Systemic circulation exchanges heat
The exchange capability of heat of device 6 is strong, and cold energy use rate is high, and its cold can accelerate natural gas under cooling circulating water, reduction high load condition to send out
The thermic load of motivation.Cooling water heat promotes LNG gasification, and natural gas engine when being high capacity supplies more fuel gas.
With the increase of LNG quantity delivereds, cooling water temperature declines, and LNG gasification amount is decreased, until LNG quantity delivereds and cooling water temperature
Again the dynamic equilibrium under normal temperature is reached.
For the present invention preferred embodiment, but the present invention is not limited to above-mentioned embodiment to the embodiment, not
In the case of the substantive content of the present invention, any conspicuously improved, replacement that those skilled in the art can make
Or modification belongs to protection scope of the present invention.
Claims (1)
1. the method for the system using LNG cold energy reduction natural gas engine cooling water temperature, it is characterised in that
The system that the LNG cold energy reduces natural gas engine cooling water temperature, including engine-cooling system and engine sheet
Body, the engine-cooling system includes radiator (8), and fan (9), thermostat (11), discharging valve (12), water pump (14) divides
Water pipe (18), water jacket (19)；The engine body includes transmission belt (13), drive (15), oil sump (16), flywheel
(17)；
Also including LNG feed systems, the LNG storage tank (1) of the LNG feed systems, high-pressure shut-off (4), manually-operated gate (5),
LNG systemic circulation feeding pipes, triple valve (7), surge tank (2), natural gas straight spraying nozzle (20) is sequentially connected by pipeline, described
LNG feed systems also include LNG partial circulating feeding pipes, and the LNG partial circulatings feeding pipe is located at manually-operated gate (5) and threeway
Between valve (7)；
Pressure regulator valve (3) is additionally provided between the triple valve (7) and surge tank (2)；
The pressure sensor set on the triple valve (7), pressure regulator valve (3), surge tank (2), natural gas straight spraying nozzle (20), section
Warm device (11), is electrically connected with ECU (21)；
The LNG systemic circulations pipeline includes LNG feeding pipes A2 in LNG feeding pipes A1 in systemic circulation and systemic circulation, described big
In circulation systemic circulation heat exchanger (6), the heat exchange are connected in LNG feeding pipes A1 and systemic circulation between LNG feeding pipes A2
The internal LNG pipelines of device (6) are around systemic circulation cooling water pipeline；
The LNG partial circulatings pipeline includes LNG feeding pipes B2 in LNG feeding pipes B1 in partial circulating and partial circulating, described small
It is connected to partial circulating heat exchanger (10) in circulation in LNG feeding pipes B1 and partial circulating between LNG feeding pipes B2, it is described small to follow
The internal LNG pipelines of ring heat exchanger (10) are around partial circulating cooling water pipeline；
The method that the system of natural gas engine cooling water temperature is reduced using LNG cold energy, specific steps are included：
(1) when engine water temperature is less than 76 DEG C, triple valve (7) is closed, and LNG passes through LNG feeding pipes in partial circulating
B1, LNG feeding pipes B2 in partial circulating is subsequently entered into partial circulating heat exchanger (10), and thermostat (11) is closed water jacket (19) and led to
To the passage of systemic circulation cooling water pipeline, cooling water is passed through into partial circulating heat exchanger (10), feeding water pump (14) and distributive pipe
(18) partial circulating is entered；
(2) when between engine water temperature reaching 76 DEG C~86 DEG C, triple valve (7) opens LNG feeding pipes A2 and small in systemic circulation
LNG feeding pipes B2 in circulation, thermostat (11) are while open systemic circulation cooling water pipeline and partial circulating cooling water pipeline, LNG
Cold energy is simultaneously by systemic circulation heat exchanger (6) and partial circulating heat exchanger (10) heat exchange；
(3) when engine water temperature is higher than 86 DEG C, triple valve (7) closes LNG feeding pipes B2 in partial circulating and leads to pressure regulator valve (3) even
Connect, open LNG feeding pipes A2 in systemic circulation and be connected with pressure regulator valve (3), thermostat (11) closes partial circulating cooling water pipeline, cold
But water passes through systemic circulation heat exchanger (6), into radiator (8), and distributive pipe (18) is entered after water pump (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN104763555A CN104763555A (en) | 2015-07-08 |
| CN104763555B true CN104763555B (en) | 2017-10-20 |
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| CN201510077319.9A Expired - Fee Related 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840350B (en) * | 2016-03-29 | 2019-01-25 | 武汉理工大学 | A kind of water bath heating device suitable for natural gas engine |
| CN107630770A (en) * | 2017-11-03 | 2018-01-26 | 黄帮义 | Liquified gas automobile air supply system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2194985Y (en) * | 1994-02-26 | 1995-04-19 | 四川省绵阳市科阳低温设备公司 | Automotive fuel supply device using liquefied natural gas as fuel |
| CN101025131A (en) * | 2007-04-02 | 2007-08-29 | 吉林大学 | Single-fuel liquified-petroleum-gas automobile cold-state starting heat-insulation preheating system |
| CN201786483U (en) * | 2010-04-27 | 2011-04-06 | 潍柴动力股份有限公司 | Fuel supply system and vehicle system comprising same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106513A (en) * | 1991-10-21 | 1993-04-27 | Mazda Motor Corp | Hydrogen fuel supplying device for hydrogen fueled engine |
| JP2001032716A (en) * | 1999-07-22 | 2001-02-06 | Sanyo Electric Co Ltd | Gas engine cooling system |
| JP2013194632A (en) * | 2012-03-21 | 2013-09-30 | Mitsubishi Heavy Ind Ltd | Engine system with supercharger and engine of liquefied gas carrier or the like with the same |
-
2015
- 2015-02-13 CN CN201510077319.9A patent/CN104763555B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2194985Y (en) * | 1994-02-26 | 1995-04-19 | 四川省绵阳市科阳低温设备公司 | Automotive fuel supply device using liquefied natural gas as fuel |
| CN101025131A (en) * | 2007-04-02 | 2007-08-29 | 吉林大学 | Single-fuel liquified-petroleum-gas automobile cold-state starting heat-insulation preheating system |
| CN201786483U (en) * | 2010-04-27 | 2011-04-06 | 潍柴动力股份有限公司 | Fuel supply system and vehicle system comprising same |
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