CN216975063U - Exhaust Gas Recirculation (EGR) cooling system of natural gas engine - Google Patents
Exhaust Gas Recirculation (EGR) cooling system of natural gas engine Download PDFInfo
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- CN216975063U CN216975063U CN202220192193.5U CN202220192193U CN216975063U CN 216975063 U CN216975063 U CN 216975063U CN 202220192193 U CN202220192193 U CN 202220192193U CN 216975063 U CN216975063 U CN 216975063U
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Abstract
The utility model relates to a natural gas engine Exhaust Gas Recirculation (EGR) cooling system, which relates to the field of engines and comprises an EGR cooler, an LNG gas cylinder and a natural gas engine; but be connected with the natural gas pipeline between three medium heat transfer's EGR cooler and the LNG gas cylinder, be connected with coolant liquid pipeline and exhaust gas line between with the natural gas engine. The utility model utilizes the EGR cooler which can simultaneously exchange heat of three mediums of natural gas, waste gas and cooling liquid, utilizes the engine cooling liquid to radiate heat to the high-temperature EGR waste gas in the EGR cooler so as to reduce the temperature of the EGR waste gas, and simultaneously heats the low-temperature natural gas so as to improve the temperature of the natural gas.
Description
Technical Field
The present invention relates to the field of engines, and more particularly to a natural gas engine Exhaust Gas Recirculation (EGR) cooling system.
Background
When Liquefied Natural Gas (LNG) is used in a natural gas engine vehicle, the liquid LNG needs to be vaporized into gaseous natural gas, and the gaseous natural gas enters the engine after reaching a suitable temperature. In the vaporization of Liquefied Natural Gas (LNG) from a liquid state to a gaseous state, a large amount of heat needs to be absorbed. For natural gas engines using Exhaust Gas Recirculation (EGR) technology routes, Exhaust Gas (EGR) is required to reduce the exhaust gas temperature to a suitable range and dissipate a large amount of heat before entering the engine.
The currently adopted method is as follows: arrange a Liquefied Natural Gas (LNG) vaporizer on the vehicle, utilize the heat of engine circulating coolant liquid to heat liquid LNG, arranged traditional EGR cooler in addition on the engine, traditional EGR cooler is used for EGR waste gas and engine coolant liquid heat transfer, utilizes engine coolant liquid to the EGR waste gas cooling, takes away the heat of EGR waste gas. Thus, the engine needs to be arranged and adopted with two heat exchangers (the LNG vaporizer and the traditional EGR cooler), which not only has high cost, but also has difficulty in controlling the flow of engine coolant entering the LNG vaporizer and the traditional EGR cooler.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is: the natural gas engine Exhaust Gas Recirculation (EGR) cooling system can effectively improve the temperature of natural gas, reduce the cost and facilitate the control of the flow of engine coolant entering an EGR cooler.
In order to achieve the aim, the technical scheme of the utility model provides a natural gas engine Exhaust Gas Recirculation (EGR) cooling system, which comprises an EGR cooler, an LNG gas cylinder and a natural gas engine; and a natural gas pipeline is connected between the EGR cooler capable of exchanging heat with the three mediums and the LNG cylinder, and a cooling liquid pipeline and a waste gas pipeline are connected between the EGR cooler and the natural gas engine.
Preferably, a water-gas separator is arranged on the waste gas pipeline.
Preferably, the system is also provided with an engine ECU, and the engine ECU is electrically connected with an exhaust gas temperature sensor, a natural gas temperature sensor and an electronic water valve; the waste gas temperature sensor is arranged on the waste gas pipeline; the natural gas temperature sensor is arranged on the natural gas pipeline; the electronic water valve is arranged on the cooling liquid pipeline.
Preferably, the natural gas engine is provided with an engine water pump water outlet, and the EGR cooler is provided with a cooling liquid inlet; the electronic water valve is arranged on the cooling liquid pipeline which is connected with the water outlet of the engine water pump and the cooling liquid inlet.
Preferably, the natural gas engine is provided with an engine water pump water inlet, and the EGR cooler is provided with a cooling liquid outlet; the electronic water valve is arranged on the cooling liquid pipeline which is connected with the water inlet of the engine water pump and the cooling liquid outlet.
Preferably, the natural gas engine is provided with an engine air inlet pipe, and the EGR cooler is provided with an exhaust gas outlet; the exhaust gas temperature sensor is arranged on the exhaust gas pipeline which is connected with the engine air inlet pipe and the exhaust gas outlet.
Preferably, the EGR cooler is provided with a natural gas outlet; the natural gas temperature sensor is arranged on the natural gas pipeline connected with the natural gas outlet.
Preferably, the natural gas temperature sensor, the exhaust gas temperature sensor and/or the electronic water valve are connected with an engine connection harness respectively with the engine ECU.
In summary, the utility model has the following beneficial technical effects:
the EGR cooler capable of exchanging heat of three media of natural gas, waste gas and cooling liquid simultaneously utilizes the engine cooling liquid to radiate high-temperature EGR waste gas in the EGR cooler so as to reduce the temperature of the EGR waste gas, and simultaneously heats low-temperature natural gas so as to improve the temperature of the natural gas.
According to the utility model, the exhaust gas temperature and the natural gas temperature after heat exchange of the EGR cooler are monitored by using the exhaust gas temperature sensor and the natural gas temperature sensor, the flow of the engine cooling liquid is regulated and controlled by the engine ECU, and the exhaust gas temperature and the natural gas temperature entering the engine are accurately controlled, so that the engine can normally run.
The cooling system has the advantages of compact structure, low cost and high control precision.
Drawings
FIG. 1 is a schematic diagram of the Exhaust Gas Recirculation (EGR) cooling system of the present invention.
Reference numerals: 1. an EGR cooler; 2. a water-gas separator; 3. an exhaust gas temperature sensor; 4. an LNG cylinder; 5. an engine ECU; 6. an electronic water valve; 7. a water outlet of the engine water pump; 8. a natural gas engine; 9. an EGR exhaust gas outlet; 10. a natural gas temperature sensor; 11. an engine connecting harness; 12. a deflation joint.
Detailed Description
The present invention is described in further detail below with reference to fig. 1.
The embodiment of the utility model discloses a natural gas engine Exhaust Gas Recirculation (EGR) cooling system, which comprises an EGR cooler 1, an LNG gas cylinder 4 and a natural gas engine 8 as shown in figure 1, wherein the EGR cooler 1 integrates the heat exchange functions of three media, namely natural gas, engine cooling liquid and engine exhaust gas.
The EGR cooler 1 is provided with a waste gas inlet, a waste gas outlet, a natural gas inlet, a natural gas outlet, a coolant inlet, a coolant outlet, and a coolant vapor outlet. The natural gas engine 8 is provided with an engine water pump water outlet 7, an engine water pump water inlet, an EGR waste gas outlet 9 and an engine air inlet pipe.
An engine water pump water outlet 7 of the natural gas engine 8 is connected with a cooling liquid inlet of the EGR cooler 1 through a cooling liquid pipeline, a cooling liquid outlet of the EGR cooler 1 is connected with a water inlet of the engine water pump through a cooling liquid pipeline, and a cooling liquid steam outlet of the EGR cooler 1 is connected with an automobile expansion water tank through a cooling liquid pipeline. An EGR waste gas outlet 9 of the natural gas engine 8 is connected with a waste gas inlet of the EGR cooler 1 through a waste gas pipeline, and a waste gas outlet of the EGR cooler 1 is connected with an engine air inlet pipe of the natural gas engine 8 through a waste gas pipeline. LNG gas cylinder 4 passes through natural gas line and is connected with EGR cooler 1, and EGR cooler 1 passes through natural gas line in addition and is connected with engine gas feed system.
Wherein, the exhaust gas pipeline connecting the exhaust gas outlet of the EGR cooler 1 and the engine intake pipe is provided with a water-gas separator 2, and the water-gas separator 2 is positioned at the downstream of the exhaust gas outlet of the EGR cooler 1.
Waste gas generated by the natural gas engine 8 enters the EGR cooler 1 through the EGR waste gas outlet 9 through a waste gas pipeline, the temperature of the waste gas is reduced after the heat exchange is carried out between the interior of the EGR cooler 1 and engine cooling liquid, and the waste gas enters an engine air inlet pipe after passing through the water-gas separator 2.
The low-temperature liquefied natural gas LNG enters the EGR cooler 1 after coming out of the LNG gas cylinder 4, the temperature of the natural gas is increased after heat exchange with engine cooling liquid in the EGR cooler 1, and then the natural gas enters an engine fuel gas supply system.
The engine cooling liquid in the EGR cooler 1 comes from a water outlet 7 of an engine water pump, and after heat exchange is carried out between the engine cooling liquid and three media, namely low-temperature natural gas and high-temperature EGR waste gas, in the EGR cooler 1, the cooling liquid returns to a water inlet of the engine water pump; the coolant vapor generated in the EGR cooler 1 is discharged into the expansion tank of the automobile through the bleeding joint 12 mounted on the EGR cooler 1.
The EGR cooler 1 capable of exchanging heat of three media, namely natural gas, waste gas and cooling liquid, is used, the engine cooling liquid is used for dissipating heat of high-temperature EGR waste gas in the EGR cooler 1 to reduce the temperature of the EGR waste gas, and meanwhile, low-temperature natural gas is heated to improve the temperature of the natural gas.
In order to better control the natural gas temperature after heat exchange and the EGR exhaust gas temperature, the utility model is also provided with an engine ECU5, an exhaust gas temperature sensor 3, a natural gas temperature sensor 10 and an electronic water valve 6.
The exhaust gas temperature sensor 3 is arranged on an exhaust gas pipeline between the water-gas separator 2 and an engine air inlet pipe; the natural gas temperature sensor 10 is arranged on a natural gas pipeline between a natural gas outlet of the EGR cooler 1 and a fuel gas supply system of the engine; the electronic water valve 6 is disposed on a coolant pipe between a coolant inlet of the EGR cooler 1 and a water outlet 7 of the engine water pump, and may be disposed on a coolant pipe between a coolant outlet of the EGR cooler 1 and a water inlet of the engine water pump.
Wherein, the natural gas temperature sensor 10 and the exhaust gas temperature sensor 3 are both connected with an engine ECU5 through an engine connecting wire harness 11; the opening degree of the electronic water valve 6 is regulated and controlled by an engine ECU5 through an engine connecting wire harness 11.
The utility model installs the natural gas temperature sensor 10 in the natural gas outlet downstream of EGR cooler 1, is used for measuring the temperature of the natural gas from natural gas outlet of EGR cooler 1; an exhaust gas temperature sensor 3 for measuring the EGR exhaust gas temperature after water removal is installed downstream of the moisture separator 2.
The natural gas temperature sensor 10 and the exhaust gas temperature sensor 3 convert the measured natural gas temperature and EGR exhaust gas temperature into electrical signals and send them to the engine ECU5 through the engine connection harness 11; the engine ECU5 transmits a control electric signal to the electronic water valve 6 through the engine connection harness 11 according to the internal software setting; the electronic water valve 6 adjusts and controls the flow rate of the engine coolant entering the EGR cooler 1 in accordance with a control electric signal from the engine ECU5, thereby accurately controlling the natural gas temperature and the EGR exhaust gas temperature within appropriate ranges.
Exhaust gas temperature sensor 3 and natural gas temperature sensor 10 monitor the exhaust gas temperature and the natural gas temperature behind EGR cooler 1, and engine ECU5 controls electron water valve 6, adjusts the water valve aperture of control electron water valve 6, realizes carrying out accurate control to the engine coolant flow who participates in the heat transfer to the exhaust gas temperature and the natural gas temperature of accurate control entering engine make the engine normal operating. The cooling system has compact structure, low cost and high control precision.
The utility model provides a natural gas engine 8 Exhaust Gas Recirculation (EGR) cooling system taking Liquefied Natural Gas (LNG) as fuel, which combines an LNG vaporizer and a traditional EGR cooler 1 into a whole to form a novel EGR cooler 1 with three-medium heat exchange, comprehensively utilizes the heat absorption of the LNG vaporizer and the exhaust gas cooling and heat dissipation of the EGR cooler 1, and is assisted with the heat exchange of engine cooling liquid, utilizes an exhaust gas temperature sensor 3 and a natural gas temperature sensor 10 to monitor the exhaust gas temperature and the natural gas temperature after the heat exchange of the EGR cooler 1, and the flow of the engine cooling liquid is adjusted and controlled through an engine ECU 5.
The above are the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present invention.
Claims (8)
1. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system, characterized by: the system comprises an EGR cooler (1), an LNG gas cylinder (4) and a natural gas engine (8); a natural gas pipeline is connected between the EGR cooler (1) capable of exchanging heat with the three mediums and the LNG gas cylinder (4), and a cooling liquid pipeline and a waste gas pipeline are connected between the natural gas engine (8).
2. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system as claimed in claim 1, wherein: and a water-gas separator (2) is arranged on the waste gas pipeline.
3. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system according to claim 1 or 2, characterized in that: the device is also provided with an engine ECU (5), wherein the engine ECU (5) is electrically connected with an exhaust gas temperature sensor (3), a natural gas temperature sensor (10) and an electronic water valve (6); the exhaust gas temperature sensor (3) is arranged on the exhaust gas pipeline; the natural gas temperature sensor (10) is arranged on the natural gas pipeline; the electronic water valve (6) is arranged on the cooling liquid pipeline.
4. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system as claimed in claim 3, wherein: the natural gas engine (8) is provided with an engine water pump water outlet (7), and the EGR cooler (1) is provided with a cooling liquid inlet; the electronic water valve (6) is arranged on the cooling liquid pipeline which is connected with the water outlet (7) of the engine water pump and the cooling liquid inlet.
5. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system as claimed in claim 3, wherein: the natural gas engine (8) is provided with an engine water pump water inlet, and the EGR cooler (1) is provided with a cooling liquid outlet; the electronic water valve (6) is arranged on the cooling liquid pipeline which is connected with the water inlet of the engine water pump and the cooling liquid outlet.
6. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system as claimed in claim 3, wherein: the natural gas engine (8) is provided with an engine air inlet pipe, and the EGR cooler (1) is provided with an exhaust gas outlet; the exhaust gas temperature sensor (3) is arranged on the exhaust gas pipeline which is connected with the engine air inlet pipe and the exhaust gas outlet.
7. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system as claimed in claim 3, wherein: the EGR cooler (1) is provided with a natural gas outlet; the natural gas temperature sensor (10) is arranged on the natural gas pipeline connected with the natural gas outlet.
8. A natural gas engine Exhaust Gas Recirculation (EGR) cooling system as claimed in claim 3, wherein: the natural gas temperature sensor (10), the exhaust gas temperature sensor (3) and/or the electronic water valve (6) are connected with an engine connection wiring harness (11) respectively through the engine ECU (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220192193.5U CN216975063U (en) | 2022-01-24 | 2022-01-24 | Exhaust Gas Recirculation (EGR) cooling system of natural gas engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220192193.5U CN216975063U (en) | 2022-01-24 | 2022-01-24 | Exhaust Gas Recirculation (EGR) cooling system of natural gas engine |
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| CN216975063U true CN216975063U (en) | 2022-07-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542269A (en) * | 2022-01-18 | 2022-05-27 | 东风汽车集团股份有限公司 | Intercooler, intercooler control method and related equipment |
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2022
- 2022-01-24 CN CN202220192193.5U patent/CN216975063U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114542269A (en) * | 2022-01-18 | 2022-05-27 | 东风汽车集团股份有限公司 | Intercooler, intercooler control method and related equipment |
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