CN217300735U

CN217300735U - LNG engine heat exchange system

Info

Publication number: CN217300735U
Application number: CN202220619701.3U
Authority: CN
Inventors: 梁昌水; 谢欣男; 王燕青; 阚守旭; 刘志伟
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-08-26
Anticipated expiration: 2032-03-21

Abstract

The utility model discloses a LNG engine heat exchange system, include: the supercharger outlet is communicated with the intercooler inlet through a first pipeline, the intercooler outlet is connected with a second pipeline, the first pipeline is connected with a third pipeline, the third pipeline enters the vaporizer, the vaporizer is connected with a fourth pipeline, the fourth pipeline is connected with the second pipeline, and the third pipeline is communicated with the fourth pipeline in the vaporizer. The problems of long time, high power of an engine water pump and the like of a hot vehicle caused by heat exchange of cooling liquid are solved, the oil consumption of the whole vehicle is reduced, and the service life of the engine is prolonged.

Description

LNG engine heat exchange system

Technical Field

The utility model relates to a natural gas car technical field especially relates to a LNG engine heat exchange system.

Background

The statements herein merely provide background related to the present disclosure and may not necessarily constitute prior art.

The LNG engine is a natural gas engine, and the vaporizer is a device used in the LNG engine to heat a liquid gas in the vaporizer until the liquid gas is vaporized. The existing vehicle generally adopts a natural gas storage tank which is connected with a vaporizer through a gas pipeline and then connected with a related gas system of an engine, and engine cooling liquid flowing out of a water pump of the engine vaporizes liquefied natural gas into gaseous natural gas through a heat exchanger.

However, the heat required by the heat exchanger is large, so that the temperature rising speed of the cooling liquid is slow, and a long time is required for heating the vehicle. When the loader of the LNG engine is used in cold areas, the temperature of cooling liquid is low when the engine is just started, the engine can be accelerated only after idling for a period of time, otherwise, the phenomenon that the evaporator is frosted or frozen due to untimely heat supply of the cooling liquid is prevented, and therefore the time for heating is long.

In addition, the engine water pump needs to provide power for the large and small circulation of a cooling system and also needs to provide the circulation of cooling liquid of warm air, and for the gas engine with the national six-belt EGR, the cooling liquid is needed to dissipate heat of the EGR and the exhaust venturi. In this case, the heat exchange of the natural gas by using the coolant also requires the power of the water pump of the engine, so that the consumed power of the water pump is too large, the oil consumption of the whole vehicle is increased, the service life of the engine is reduced, and the failure rate is increased.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model provides an aim at provides a LNG engine heat exchange system to solve and adopt the coolant liquid to carry out the hot car time that the heat exchange leads to long, the big scheduling problem of engine water pump power, reduced whole car oil consumption, prolonged engine life.

Another object of the present invention is to provide an engine based on the above exhaust mixing device.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

an LNG engine heat exchange system comprising: the supercharger outlet is communicated with the intercooler inlet through a first pipeline, the intercooler outlet is connected with a second pipeline, the first pipeline is connected with a third pipeline, the third pipeline enters the vaporizer, the vaporizer is connected with a fourth pipeline, the fourth pipeline is connected with the second pipeline, and the third pipeline is communicated with the fourth pipeline in the vaporizer.

And the evaporator further comprises a heat exchange tube arranged in the evaporator, the inlet of the heat exchange tube is connected with the third pipeline, and the outlet of the heat exchange tube is connected with the fourth pipeline.

Further, the heat exchange tube comprises a first return tube and a second return tube, a plurality of straight tubes are arranged between the first return tube and the second return tube, and the first return tube and the second return tube are communicated through the straight tubes.

Further, the flowing direction of the gas in the heat exchange tube is opposite to the flowing direction of the natural gas in the vaporizer.

Further, the third pipeline is made of heat insulation materials.

Further, the outer side of the third pipeline is coated with a heat insulation layer.

Further, the third pipeline is provided with a pneumatic valve.

Further, the third pipeline is provided with a pressure detection device.

Further, the vaporizer has a natural gas inlet connected to a natural gas tank.

Further, the vaporizer is provided with a natural gas outlet which is connected with a pressure stabilizing device.

The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least:

1. the utility model discloses a heat exchange system sets up the third pipeline and the fourth pipeline that the bypass is linked together promptly at first pipeline and second pipeline, arranges the part of bypass in the vaporizer. The pressurized gas mainly flows through the intercooler through the first pipeline, the other small part of gas flows through the vaporizer through the third pipeline, the heat of the part of pressurized gas in the vaporizer is absorbed by the LNG (the LNG is changed from liquid to gas), and then the gas flows out of the fourth pipeline and finally is combined with the gas passing through the intercooler in the second pipeline. The pressurized gas is used for heating the natural gas, and the heat requirement of the vaporizer can be completely met in the actual working process of the vehicle. Once the automobile is started, the temperature of the pressurized gas rises along with the temperature rise, the automobile does not need to be heated, the heating effect is good, and the frosting time and the icing fault can be reduced when the automobile is used in cold regions.

2. Utilize the utility model discloses a heat exchange system need not to set up coolant liquid heating water route, has reduced the coolant liquid and has flowed and heat consumption when starting, has reduced engine water pump power consumption, has also reduced the operation cost in the normal use process of vehicle, makes the dynamic property and the economic nature of whole car obtain improving, reaches energy saving and emission reduction's purpose. The saved part of cooling liquid enables the vehicle heating time to be shorter, and the warm air effect is better when the ambient temperature is low.

3. The utility model discloses a heat exchange system carries out the heat exchange with the partial gas after the pressure boost with natural gas in the vaporizer, is favorable to the gaseous further heat dissipation after the pressure boost, has reduced the load of intercooler, can reduce the heat radiating area of intercooler, is favorable to reduce cost.

4. Traditional coolant liquid heating methods need regularly clear up the incrustation scale in the natural gas heat exchange pipeline, the utility model discloses a heat exchange system compares in traditional heating methods, need not to clear up the incrustation scale in the pipeline. And the structure is simple and the implementation is easy.

5. The utility model discloses a heat exchange system has increased the area of contact of high-pressure gas in the vaporizer with the natural gas through the structure of heat exchange tube, further with the flow direction of gas in the heat exchange tube with the flow opposite direction of natural gas in the vaporizer increases the heat exchange time of high-pressure gas and natural gas, improves heat exchange efficiency, guarantees the heat demand of vaporizer.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic structural diagram of an embodiment of the LNG engine heat exchange system of the present invention;

fig. 2 is a schematic diagram of a heat exchange tube of an embodiment of the LNG engine heat exchange system of the present invention;

FIG. 3 is a road spectrum diagram of a 6L gas engine matched with the conventional working conditions of an European bus;

FIG. 4 is a view of a 12L diesel engine matched tractor provincial road driving chart;

in the figure: 1. an LNG gas cylinder; 2. a vaporizer; 3. a voltage stabilizer; 4. a filter; 5. an injection valve; 6. a mixer; 7. an electronic throttle valve; 8. an engine; 9. an air filter; 10. a supercharger; 11. an intercooler; 21. a first pipeline; 22. a second pipeline; 23. a third pipeline; 24. a fourth pipeline; 25. a heat exchange tube; 251. a first return pipe; 252. a second return pipe; 253. a straight pipe; 254. an air inlet pipe; 255. an air outlet pipe;

the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the illustration is for illustrative purposes only.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "upper", "lower", "left" and "right" in the present application, if any, merely indicate correspondence with the upper, lower, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the present invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

The term interpretation section: the terms "mounting", "connecting", "fixing" and the like in the present invention should be understood in a broad sense, for example, they may be fixed or detachable or integrated; the two components can be connected mechanically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and specific meanings of the terms in the present invention can be understood by those skilled in the art according to specific situations.

Just as the background art introduces, adopt the coolant liquid mode longer when the cold district warms up the car to and water pump consumed power is too big, and whole car oil consumption increases, and engine life reduces, and the fault rate increases, for solving above-mentioned technical problem, the utility model provides a LNG engine heat exchange system.

As shown in fig. 1-2, an embodiment of the present invention describes an LNG engine heat exchange system, including: booster 10, intercooler 11 and vaporizer 2, booster 10 export with intercooler 11 entry is through first pipeline 21 intercommunication, intercooler 11 export connects second pipeline 22, follows first pipeline 21 connects out third pipeline 23, third pipeline 23 gets into vaporizer 2, follows vaporizer 2 connects out fourth pipeline 24, fourth pipeline 24 receives second pipeline 22, third pipeline 23 with fourth pipeline 24 communicates in vaporizer 2.

The heat exchange system of the utility model is provided with a bypass, namely a third pipeline 23 and a fourth pipeline 24 which are communicated with each other, on the first pipeline 21 and the second pipeline 22, and the part of the bypass is arranged in the carburetor 2. The pressurized gas mainly flows through the intercooler 11 via the first line 21 and a small further part of the gas flows through the vaporizer 2 via the third line 23, where the heat of the pressurized gas is absorbed by the LNG in the vaporizer 2 (which converts the LNG from liquid to gas), and flows out of the fourth line 24 and finally merges with the gas passing through the intercooler 11 in the second line 22. The pressurized gas is used for heating the natural gas, and the heat requirement of the vaporizer 2 can be completely met in the actual working process of the vehicle. Once the automobile is started, the temperature of the pressurized gas rises along with the temperature rise, the automobile does not need to be heated, the heating effect is good, and the frosting time and the icing fault can be reduced when the automobile is used in cold regions.

The utility model discloses a heat exchange system carries out the heat exchange with the partial gas after the pressure boost with natural gas in the vaporizer 2, is favorable to the gaseous further heat dissipation after the pressure boost, has reduced intercooler 11's load, can reduce intercooler 11's heat radiating area, is favorable to reduce cost.

The heat exchange system further comprises a heat exchange tube 25 arranged in the vaporizer 2, an inlet of the heat exchange tube 25 is connected with the third pipeline 23, and an outlet of the heat exchange tube 25 is connected with the fourth pipeline 24. The third pipeline 23 and the fourth pipeline 24 are communicated through a heat exchange pipe 25, and the pressurized gas is prevented from being mixed when exchanging heat with the natural gas.

Utilize the utility model discloses a heat exchange system need not to set up coolant liquid heating water route, has reduced the coolant liquid and has flowed and heat consumption when starting, has reduced engine water pump power consumption, has also reduced the operation cost in the normal use process of vehicle, makes the dynamic property and the economic nature of whole car obtain improving. The saved part of cooling liquid enables the vehicle heating time to be shorter, and the warm air effect is better when the ambient temperature is low.

Traditional coolant liquid heating methods need regularly to clear up the incrustation scale in the natural gas heat exchange pipeline, the utility model discloses a heat exchange system compares in traditional heating methods, need not to clear up the incrustation scale in the pipeline. And the structure is simple and the implementation is easy.

As shown in fig. 2, the heat exchange tube 25 includes a first loop tube 251 and a second loop tube 252, a plurality of straight tubes 253 are disposed between the first loop tube 251 and the second loop tube 252, and the plurality of straight tubes 253 communicate the first loop tube 251 and the second loop tube 252. The contact area of the high-pressure gas and the natural gas in the vaporizer 2 is increased through the structure of the heat exchange tube 25, the heat exchange efficiency is improved, and the heat requirement of the vaporizer 2 is ensured.

The natural gas in the vaporizer 2 flows from top to bottom as shown in fig. 1, and the gas in the heat exchange tube 25 can flow from the inlet tube 254 to the outlet tube 255 as shown in fig. 2. Further, in order to increase the heat exchange time between the high-pressure gas and the natural gas, the flowing direction of the gas in the heat exchange tube 25 is opposite to the flowing direction of the natural gas in the vaporizer 2, that is, the gas in the heat exchange tube 25 flows from bottom to top by changing the connection mode of the pipelines.

The third pipeline 23 is made of heat insulating material, or the outside of the third pipeline 23 is coated with a heat insulating layer, so that heat loss of high-pressure gas in the flowing process of the third pipeline 23 is reduced.

The third pipeline 23 is provided with a pneumatic valve and a pressure detection device, and the control of high-pressure gas in the third pipeline 23 is realized through the cooperation of the pneumatic detection device and the pneumatic valve.

The vaporizer 2 has a natural gas inlet connected to a natural gas tank. The Liquefied Natural Gas (LNG) mainly contains methane (CH) ₄ ) The natural gas is liquid obtained by purifying, compressing and cooling the natural gas to the boiling point (-162 ℃), is colorless, tasteless, nontoxic and insoluble in water, and has no corrosivity to metals.

When the whole vehicle runs under full load and actual high load, the temperature of the gas after pressurization is high and can reach more than 100 ℃, and some types of vehicles can reach 150 ℃, and the temperature of the gas reaching the interface can not be lower than 50 ℃ in consideration of heat loss of pipelines, so that the heating purpose can be completely achieved.

Fig. 3 shows data acquired when WP6NG matches a section of the bus during actual operation, and it can be seen that when the load factor of the entire bus is low, the gas temperature before the charge intercooler 11 is always above 60 ℃, and the average temperature of the entire section is 80 ℃. Fig. 4 is a road spectrum of a 12L diesel engine matched with a tractor, the load factor of the whole vehicle is low, and the temperature of the gas before the intercooler 11 after pressurization is always about 70 ℃.

The vaporizer 2 is provided with a natural gas outlet which is connected with a pressure stabilizer 3, and the pressure of the natural gas flowing out of the vaporizer 2 is ensured to meet the requirement through the pressure stabilizer. The filter 4, the injection valve 5, the mixer 6, the electronic throttle valve 7 and the engine 8 are arranged in sequence after the pressure stabilizer, and the air filter 9 is arranged at the front end of the supercharger 10, and the part is not limited by the existing design.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. An LNG engine heat exchange system, comprising: the supercharger outlet is communicated with the intercooler inlet through a first pipeline, the intercooler outlet is connected with a second pipeline, the first pipeline is connected with a third pipeline, the third pipeline enters the vaporizer, the vaporizer is connected with a fourth pipeline, the fourth pipeline is connected with the second pipeline, and the third pipeline is communicated with the fourth pipeline in the vaporizer.

2. The LNG engine heat exchange system of claim 1, further comprising a heat exchange tube disposed within the vaporizer, the heat exchange tube having an inlet connected to the third line and an outlet connected to the fourth line.

3. The LNG engine heat exchange system of claim 2, wherein the heat exchange tubes comprise a first loop tube and a second loop tube, and a plurality of straight tubes are disposed between the first loop tube and the second loop tube, and communicate the first loop tube with the second loop tube.

4. The LNG engine heat exchange system of claim 2, wherein the flow direction of the gas in the heat exchange tubes is opposite to the flow direction of the natural gas in the vaporizer.

5. The LNG engine heat exchange system of claim 1, wherein the third conduit is an insulating material.

6. The LNG motor heat exchange system of claim 1, wherein the third conduit is externally coated with an insulation layer.

7. The LNG motor heat exchange system of claim 1, wherein the third line is provided with a pneumatic valve.

8. The LNG motor heat exchange system of claim 1, wherein the third pipeline is provided with a pressure detection device.

9. The LNG engine heat exchange system of claim 1, wherein the vaporizer has a natural gas inlet connected to a natural gas tank.

10. The LNG engine heat exchange system of claim 1, wherein the vaporizer has a natural gas outlet connected to a pressure stabilizer.