CN218816643U - Liquid hydrogen engine adopting low-temperature air intake - Google Patents
Liquid hydrogen engine adopting low-temperature air intake Download PDFInfo
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- CN218816643U CN218816643U CN202223247764.XU CN202223247764U CN218816643U CN 218816643 U CN218816643 U CN 218816643U CN 202223247764 U CN202223247764 U CN 202223247764U CN 218816643 U CN218816643 U CN 218816643U
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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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The utility model discloses an adopt liquid hydrogen engine that low temperature was admitted air, liquid hydrogen engine includes through tube coupling supercharged engine body, booster, pressure boost intercooler, liquid hydrogen vaporization and air cooling device, measurement controlling means, liquid hydrogen vaporization and air cooling device are used for realizing the vaporization of liquid hydrogen and the cooling of the internal air of supercharged engine that enters into, measurement controlling means can realize the work of liquid hydrogen vaporization and air cooling device, liquid hydrogen engine according to ambient temperature to guarantee to enter into this internal gas of supercharged engine and be predetermined low temperature gas. The liquid hydrogen is used to absorb the heat of the air entering the supercharged engine, further reduce the air temperature, increase the air quantity entering the engine and simultaneously vaporize the liquid hydrogen into low-temperature hydrogen.
Description
Technical Field
The utility model belongs to the technical field of supercharged engine, concretely relates to adopt liquid hydrogen engine that low temperature admits air.
Background
Chinese patent CN217538873U discloses a low temperature hydrogen injection structure for a liquid hydrogen engine, and more particularly discloses a hydrogen supply and injection device and a measurement control device capable of injecting low temperature hydrogen into an intake manifold of the engine, which can realize the injection of low temperature hydrogen into the intake manifold of the liquid hydrogen engine, thereby reducing the air temperature and increasing the air amount entering the engine. However, in the prior art, in order to increase the power of the automobile engine, a supercharger is added to increase the air entering the cylinder in the engine, so as to increase the power of the engine.
SUMMERY OF THE UTILITY MODEL
The utility model discloses plan to provide an adopt liquid hydrogen engine that low temperature was admitted air absorbs the heat that gets into air in the supercharged engine with liquid hydrogen, further reduces air temperature, improves the air quantity that gets into the engine, becomes low temperature hydrogen with liquid hydrogen vaporization simultaneously.
Therefore, the utility model discloses the technical scheme who adopts does: the utility model provides an adopt liquid hydrogen engine that low temperature was admitted air, liquid hydrogen engine includes through tube coupling supercharged engine body, booster, pressure boost intercooler, liquid hydrogen vaporization and air cooling device, measurement controlling means, liquid hydrogen vaporization and air cooling device are used for realizing the vaporization of liquid hydrogen and enter into the cooling of this internal air of supercharged engine, measurement controlling means can realize the work of liquid hydrogen vaporization and air cooling device, liquid hydrogen engine according to ambient temperature to the assurance enters into this internal gas of supercharged engine and is predetermined low temperature gas.
Preferably, the liquid hydrogen vaporization and air cooling device comprises an air cooling pipeline and a liquid hydrogen vaporization pipeline, the liquid hydrogen vaporization pipeline comprises a liquid hydrogen tank, a first manual valve, a second vaporizer, a pressure stabilizing tank, a pressure regulator and a hydrogen rail which are connected through pipelines, the output end of the engine cooling circulating water passes through the second vaporizer, and a water flow regulating valve is arranged between the output end of the engine cooling circulating water and the second vaporizer;
the air cooling pipeline comprises a first vaporizer, one end of the first vaporizer is connected with the liquid hydrogen tank through a pipeline, the other end of the first vaporizer is connected with a second vaporizer through a pipeline, and a connecting pipeline between the supercharged intercooler and the supercharged engine body penetrates through the first vaporizer; and a second manual valve for controlling liquid hydrogen to enter the first vaporizer is arranged between the first manual valve and the first vaporizer, and a third manual valve for controlling liquid hydrogen to enter the second vaporizer is arranged between the first manual valve and the second vaporizer.
It is further preferred that, measurement controlling means includes controller, hydrogen temperature sensor, ambient temperature sensor and air temperature sensor, hydrogen temperature sensor sets up on the surge tank, ambient temperature sensor sets up outside the liquid hydrogen engine, air temperature sensor sets up on the liquid hydrogen engine intake pipe, water flow control valve, hydrogen temperature sensor, ambient temperature sensor and air temperature sensor all are connected with the controller electricity.
More preferably, when the supercharged engine body is in operation, the first manual valve and the second manual valve are opened and the third manual valve is closed to vaporize the liquid hydrogen to absorb the heat of the air entering the intake pipe of the liquid hydrogen engine and the heat of the cooling circulating water when the ambient temperature sensor detects that the ambient temperature is higher than 0 ℃, thereby reducing the temperature of the air entering the supercharged engine body.
The utility model has the advantages that: when the environment is too high, the temperature of the air passing through the supercharger and the supercharged intercooler is also higher, at the moment, the liquid hydrogen is vaporized to absorb the heat of the air, the temperature of the air entering an air inlet pipe of the liquid hydrogen engine is reduced, so that the air quantity entering the engine is increased, the power and the heat efficiency of the engine are improved, and the discharge quantity of nitrogen oxides is reduced; the low-temperature hydrogen is injected at the air inlet of the liquid hydrogen engine, so that the possibility of backfire detonation of the hydrogen engine adopting multi-point sequential injection of the air inlet can be reduced; the liquid hydrogen storage tank has the advantages of high energy density and small volume, is favorable for installation on the whole vehicle, and can improve the gas storage capacity, thereby increasing the driving mileage of the whole vehicle.
Drawings
Fig. 1 is a schematic structural diagram of the present invention (the solid line is a pipe connection, and the dotted line is an electrical connection).
Detailed Description
The invention will be further described by way of examples with reference to the accompanying drawings:
as shown in fig. 1, a liquid hydrogen engine using low-temperature intake mainly comprises a supercharged engine body 9, a supercharger, a supercharged intercooler 10, a liquid hydrogen vaporization and air cooling device, and a measurement control device, wherein the supercharged engine body 9, the supercharger and the supercharged intercooler 10 are connected by pipelines, and the specific setting modes are the prior art and are not described herein again.
The liquid hydrogen vaporization and air cooling device is used for achieving vaporization of liquid hydrogen and cooling of air entering the supercharged engine body 9, and the measurement control device can achieve work of the liquid hydrogen vaporization and air cooling device and the liquid hydrogen engine according to the ambient temperature, so that gas entering the supercharged engine body 9 is guaranteed to be preset low-temperature gas.
The liquid hydrogen vaporization and air cooling device comprises an air cooling pipeline and a liquid hydrogen vaporization pipeline, wherein the liquid hydrogen vaporization pipeline comprises a liquid hydrogen tank 1, a first manual valve 2, a second vaporizer 5, a pressure stabilizing tank 8, a pressure regulator 15 and a hydrogen rail 16 which are sequentially connected through a pipeline, the output end of the cooling circulating water of the engine penetrates through the second vaporizer 5, and a water flow regulating valve 7 is arranged between the output end of the cooling circulating water of the engine and the second vaporizer 5.
The specific structure of the air cooling pipeline comprises a first vaporizer 4, one end of the first vaporizer 4 is connected with a liquid hydrogen tank 1 through a pipeline, the other end of the first vaporizer 4 is connected with a second vaporizer 5 through a pipeline, a connecting pipeline between a supercharged intercooler 10 and a supercharged engine body 9 penetrates through the first vaporizer 4, a second manual valve 3 used for controlling liquid hydrogen to enter the first vaporizer 4 is arranged between the first manual valve 2 and the first vaporizer 4, and a third manual valve 6 used for controlling liquid hydrogen to enter the second vaporizer 5 is arranged between the first manual valve 2 and the second vaporizer 5.
The liquid hydrogen storage device comprises a liquid hydrogen tank 1, a first manual valve 2, a second manual valve 3 and a third manual valve 6, wherein the liquid hydrogen tank is used for storing liquid hydrogen, the first manual valve 2, the second manual valve 3 and the third manual valve 6 are used for controlling the connection and disconnection of pipelines, a first vaporizer 4 and a second vaporizer 5 are used for vaporizing the liquid hydrogen into gaseous hydrogen and heating the gaseous hydrogen, a water flow regulating valve 7 is used for regulating the flow of cooling circulation water of an engine entering the second vaporizer 5, and a pressure stabilizing tank 8 is used for stabilizing the pressure of the hydrogen.
The specific structure of the measurement control device comprises a controller 14, a hydrogen temperature sensor 11, an environment temperature sensor 13 and an air temperature sensor 12, wherein the hydrogen temperature sensor 11 is arranged on a pressure stabilizing tank 8 and used for measuring the temperature of hydrogen, the environment temperature sensor 13 is arranged outside the liquid hydrogen engine and used for measuring the temperature of the external environment, the air temperature sensor 12 is arranged on an air inlet pipe of the liquid hydrogen engine and used for measuring the temperature of air entering the air inlet pipe of the liquid hydrogen engine, and the water flow regulating valve 7, the hydrogen temperature sensor 11, the environment temperature sensor 13 and the air temperature sensor 12 are all electrically connected with the controller 14.
When the supercharged engine body 9 is in operation, fresh air flows into the supercharger and becomes air with higher pressure and temperature (for example, 100 ℃) after supercharging. The temperature of the air with higher temperature is reduced after being cooled by the charge air cooler 10, which is the 1 st temperature reduction of the air entering the air inlet pipe of the liquid hydrogen engine, for example, the temperature is reduced from 100 ℃ to 50 ℃.
When the ambient temperature sensor 13 detects that the ambient temperature is higher than 0 ℃ during operation of the supercharged engine body 9, such as during use in summer, the ambient temperature is detected to be 30 ℃, the first manual valve 2 and the second manual valve 3 are opened, the third manual valve 6 is closed, and the liquid hydrogen flowing out of the liquid hydrogen tank 1 flows through the first manual valve 2, the second manual valve 3, the first vaporizer 4, the second vaporizer 5, and the surge tank 8 in this order. In the first vaporizer 4, the liquid hydrogen exchanges heat with the air, the liquid hydrogen absorbs the heat of the air to vaporize and heat up, and the temperature of the air is reduced after heat release, namely the 2 nd cooling of the air entering the air inlet pipe of the liquid hydrogen engine. The pressurized air is cooled twice and then becomes air with lower temperature. This increases the density of the air, increases the amount of air entering the engine, increases the power and thermal efficiency of the engine, and reduces the amount of nitrogen oxides emitted. If the liquid hydrogen is not completely vaporized and heated in the first vaporizer 4, the liquid hydrogen can be heated in the second vaporizer 5 by the engine cooling circulating water, and the water flow rate adjusting valve 7 adjusts the water flow rate so that the liquid hydrogen is completely vaporized into gas and reaches the required temperature, for example, the hydrogen reaches-28 ℃ to-22 ℃.
When the ambient temperature sensor 13 detects that the ambient temperature is not higher than 0 ℃, such as in winter, the ambient temperature is 0 ℃, the first manual valve 2 and the third manual valve 6 are opened, the second manual valve 3 is closed, and the liquid hydrogen flowing out of the liquid hydrogen tank 1 flows through the first manual valve 2, the third manual valve 6, the second vaporizer 5, and the surge tank 8 in this order. In the second vaporizer 5, the liquid hydrogen is heated with the engine cooling circulating water, and the water flow rate is adjusted by the water flow rate adjusting valve 7 so that the liquid hydrogen is completely vaporized into gas and reaches a desired temperature, for example, the hydrogen gas reaches-28 ℃ to-22 ℃.
The cooling effect of the liquid hydrogen on the air can be calculated through calculation: assuming that the rated power of the supercharged engine is 100kW, the consumption rate of hydrogen is 80 g/kWh, the excess air ratio is 2 (here, lean combustion), the temperature of the air after the charge intercooler 9 is 50 ℃, the consumption rate of hydrogen is 8kg/h and the consumption rate of air is 550.4kg/h (theoretical air-fuel ratio is 34.4) when the engine is in operation. Assuming that the first vaporizer 4 has a 20 ℃ cooling effect on the air, the specific cooling effect is related to the structure and size of the vaporizer, i.e. the flow rate of 550.4kg/h of air is reduced from 50 ℃ to 30 ℃, by the following formula:
heat release of air = air flow rate × air specific heat × amount of decrease in air temperature
The amount of heat that the air needs to give off was calculated to be 11063.04kJ/h (3.073 kW). For liquid hydrogen, 8kg/h of liquid hydrogen (at the moment, the temperature of the liquid hydrogen is-240 ℃) absorbs latent heat of vaporization, the liquid hydrogen is changed into gaseous hydrogen (at the moment, the temperature is not changed to-240 ℃) from liquid state, and 3600kJ/h of heat absorption (the latent heat of vaporization of the hydrogen is 450 kJ/kg) is needed. According to the energy balance equation, that is, the heat absorption of hydrogen is equal to the heat release of air, the heat for heating hydrogen at low temperature is only 7463.04kJ/h, and the part of heat is used for raising the temperature of hydrogen by the following formula:
endothermic amount of hydrogen = hydrogen flow rate × increase of hydrogen specific heat × hydrogen temperature
The temperature of the hydrogen was calculated to increase from-240 c by 65.24 c to bring the hydrogen to-174.76 c, the temperature at the hydrogen outlet of the first vaporizer 4. Thus, in the first vaporizer 4, liquid hydrogen at a flow rate of 8kg/h becomes gaseous hydrogen at-174.76 ℃ by heat absorption; air at a flow rate of 550.4kg/h exotherms, decreasing the temperature from 50 ℃ (thermodynamic temperature 323K) to 30 ℃ (thermodynamic temperature 303K), the density of the gas being inversely proportional to thermodynamic temperature and directly proportional to pressure according to the ideal gas equation. Under the condition of constant gas pressure, the density of the gas is only in direct proportion to the thermodynamic temperature, the density of the air is increased by 6.6%, the air quantity entering the engine is also increased by 6.6%, and the calculation process is shown in the table 1. Under the same air-fuel ratio condition, the power of the engine will increase by 6.6%, and the thermal efficiency will also increase.
TABLE 1 calculation of air temperature drop
The-174.76 c hydrogen from the first vaporizer 4 flows into the second vaporizer 5. In the second vaporizer 5, the low-temperature hydrogen gas is heated with engine cooling water. Assume that the desired hydrogen temperature is-25 ℃. + -. 3 ℃. When the temperature measured by the hydrogen temperature sensor 11 is lower than-28 ℃, the controller 14 controls the water flow regulating valve 7 to increase the water flow so as to increase the temperature of the hydrogen; when the temperature measured by the hydrogen temperature sensor 11 is higher than-22 ℃, the controller 14 controls the water flow regulating valve 7 to reduce the water flow so as to reduce the hydrogen temperature. This allows to maintain the hydrogen temperature in the range of-25 c + -3 c.
When the liquid hydrogen engine works, low-temperature hydrogen is injected into the air inlet. When the air inlet valve is opened, even if high-temperature gas flows back to the air inlet pipe from the air cylinder, the high-temperature gas meets air at 30 ℃ and low-temperature hydrogen at about-25 ℃, and the tempering phenomenon is not easy to occur relative to air at 50 ℃ and hydrogen at about 25 ℃.
Claims (2)
1. The utility model provides an adopt liquid hydrogen engine that low temperature was admitted air, liquid hydrogen engine includes and connects supercharged engine body (9), booster and pressure boost intercooler (10) through the pipeline, its characterized in that: the device also comprises a liquid hydrogen vaporization and air cooling device and a measurement control device, wherein the liquid hydrogen vaporization and air cooling device is used for realizing vaporization of liquid hydrogen and cooling of air entering the supercharged engine body (9), and the measurement control device can realize the work of the liquid hydrogen vaporization and air cooling device and the liquid hydrogen engine according to the ambient temperature so as to ensure that the gas entering the supercharged engine body (9) is preset low-temperature gas;
the liquid hydrogen vaporization and air cooling device comprises an air cooling pipeline and a liquid hydrogen vaporization pipeline, the liquid hydrogen vaporization pipeline comprises a liquid hydrogen tank (1), a first manual valve (2), a second vaporizer (5), a pressure stabilizing tank (8), a pressure regulator and a hydrogen rail which are connected through pipelines, the output end of the cooling circulating water of the engine penetrates through the second vaporizer (5), and a water flow regulating valve (7) is arranged between the output end of the cooling circulating water of the engine and the second vaporizer (5);
the air cooling pipeline comprises a first vaporizer (4), one end of the first vaporizer (4) is connected with the liquid hydrogen tank (1) through a pipeline, the other end of the first vaporizer (4) is connected with a second vaporizer (5) through a pipeline, and a connecting pipeline between the supercharged intercooler (10) and the supercharged engine body (9) penetrates through the first vaporizer (4); a second manual valve (3) used for controlling liquid hydrogen to enter the first vaporizer (4) is arranged between the first manual valve (2) and the first vaporizer (4), and a third manual valve (6) used for controlling liquid hydrogen to enter the second vaporizer (5) is arranged between the first manual valve (2) and the second vaporizer (5);
the measurement control device comprises a controller (14), a hydrogen temperature sensor (11), an ambient temperature sensor (13) and an air temperature sensor (12), wherein the hydrogen temperature sensor (11) is arranged on a pressure stabilizing tank (8), the ambient temperature sensor (13) is arranged outside the liquid hydrogen engine, the air temperature sensor (12) is arranged on an air inlet pipe of the liquid hydrogen engine, and the water flow regulating valve (7), the hydrogen temperature sensor (11), the ambient temperature sensor (13) and the air temperature sensor (12) are electrically connected with the controller (14).
2. The liquid hydrogen engine using low-temperature intake air according to claim 1, characterized in that: when the supercharged engine body (9) works, when the environment temperature sensor (13) detects that the environment temperature is higher than 0 ℃, the first manual valve (2) and the second manual valve (3) are opened, the third manual valve (6) is closed, so that the liquid hydrogen vaporization energy can absorb the heat of air entering an air inlet pipe of the liquid hydrogen engine and the heat of cooling circulating water, the temperature of the air entering the supercharged engine body (9) is reduced, when the environment temperature sensor (13) detects that the environment temperature is not higher than 0 ℃, the first manual valve (2) and the third manual valve (6) are opened, the second manual valve (3) is closed, and the liquid hydrogen vaporization energy can absorb the heat of the cooling circulating water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223247764.XU CN218816643U (en) | 2022-12-05 | 2022-12-05 | Liquid hydrogen engine adopting low-temperature air intake |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223247764.XU CN218816643U (en) | 2022-12-05 | 2022-12-05 | Liquid hydrogen engine adopting low-temperature air intake |
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| Publication Number | Publication Date |
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| CN218816643U true CN218816643U (en) | 2023-04-07 |
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| CN202223247764.XU Active CN218816643U (en) | 2022-12-05 | 2022-12-05 | Liquid hydrogen engine adopting low-temperature air intake |
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