CN-122014997-A - Method for treating evaporated gas of liquid hydrogen supply system and vehicle

CN122014997ACN 122014997 ACN122014997 ACN 122014997ACN-122014997-A

Abstract

The application relates to an evaporation gas treatment method of a liquid hydrogen supply system and a vehicle, comprising the steps of obtaining the current working state of a fuel cell; and determining a target treatment mode of the evaporation gas according to the evaporation gas pressure, the target preset pressure and the current working state of the fuel cell, and treating the evaporation gas according to the target treatment mode. Therefore, the problems that the existing treatment of the evaporating gas of the vehicle-mounted liquid hydrogen storage tank cannot be adaptively managed according to the actual running state of the vehicle, the energy utilization efficiency of the whole vehicle is low, the fuel is wasted and the like are solved, the pressure of the evaporating gas is prejudged in advance, the evaporating gas can be timely controlled by starting a treatment strategy through the prediction of the pressure of the evaporating gas and the monitoring of the working state of the fuel cell, the aims of zero emission, low energy consumption and high safety of the vehicle-mounted liquid hydrogen system are fulfilled, and the overall performance and reliability of the vehicle-mounted liquid hydrogen system are improved.

Inventors

ZHAO JINGANG
GUO FENGGANG
SHAO GENGHUA
ZHAN CHAO
ZHAO HONGJIAN
LI QING
YAO DONGSHENG
Sang Jingzhe

Assignees

北汽福田汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251231

Claims (10)

1. A method for treating a boil-off gas of a liquid hydrogen supply system, the method comprising the steps of: acquiring the current working state of the fuel cell; predicting the evaporation gas pressure of the liquid hydrogen storage device in a preset future time period; And determining a target processing mode of the evaporated gas according to the evaporated gas pressure, the target preset pressure and the current working state of the fuel cell, and processing the evaporated gas according to the target processing mode.
2. The method of claim 1, wherein predicting the boil-off gas pressure of the liquid hydrogen storage device over a preset future period of time comprises: Acquiring the current internal temperature and the current external wall environment temperature of the liquid hydrogen storage device; calculating a current heat transfer rate of the boil-off gas of the liquid hydrogen storage device from the current internal temperature, the current external wall ambient temperature; And calculating the vaporization amount of the vaporization gas in the preset future time according to the current heat transfer rate, and calculating the vaporization gas pressure of the liquid hydrogen storage device in the preset future time according to the vaporization amount of the vaporization gas in the preset future time.
3. The method of claim 1, wherein the determining the target process mode of the boil-off gas based on the boil-off gas pressure, a target preset pressure, and a current operating state of the fuel cell, wherein the target preset pressure comprises a first preset pressure and a second preset pressure, comprises: If the pressure of the evaporated gas is smaller than a second preset pressure and the fuel cell is in a working state, the target processing mode is a supply processing mode; if the evaporation gas pressure is greater than or equal to the second preset pressure and less than the first preset pressure, the target processing mode is a cache processing mode; and if the pressure of the evaporating gas is greater than or equal to the first preset pressure, the target treatment mode is an emission treatment mode, wherein the second preset pressure is smaller than the first preset pressure.
4. A method according to claim 3, wherein, when processing the boil-off gas according to the feed processing mode, comprising: Determining the energy of the evaporated gas, and acquiring the current required power and the available power margin of the fuel cell; Calculating the power of the liftable fuel cell under the condition that the energy of the evaporated gas is larger than the current power demand; and comparing the power of the liftable fuel cell with the available power allowance of the fuel cell, and processing the evaporated gas according to the comparison result of the power of the liftable fuel cell and the available power allowance of the fuel cell.
5. The method of claim 4, wherein said processing said boil-off gas based on a comparison of said power of said liftable fuel cell and an available power margin of said fuel cell comprises: and if the power of the liftable fuel cell is smaller than or equal to the available power allowance of the fuel cell, controlling part of the gas of the evaporated gas to be introduced into the fuel cell based on the power of the liftable fuel cell.
6. The method of claim 5, wherein, in the event that the power of the liftable fuel cell is greater than the available power margin of the fuel cell, comprising: and introducing part of the gas of the evaporation gas into the fuel cell according to the real-time power requirement of the fuel cell, and discharging the redundant evaporation gas to a second buffer device, wherein the gas in the second buffer device can be introduced into the fuel cell.
7. The method according to claim 4, characterized in that in case the energy of the boil-off gas is less than or equal to the current power demand, it comprises: and controlling the evaporated gas to be introduced into the fuel cell.
8. A method according to claim 3, wherein processing the boil-off gas according to the buffer processing mode comprises: And controlling the first pressure relief device to be opened, and introducing the evaporation gas into the second buffer device for buffering.
9. A method according to claim 3, wherein treating the boil-off gas according to the emission treatment mode comprises: and controlling the second pressure relief device to be opened, releasing the hydrogen in the second buffer device to the catalytic device, and discharging the hydrogen to the atmosphere after chemical reaction.
10. A vehicle comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of treating boil-off gas of a liquid hydrogen supply system according to any one of claims 1 to 9.

Description

Method for treating evaporated gas of liquid hydrogen supply system and vehicle Technical Field The application relates to the technical field of vehicle-mounted liquid hydrogen, in particular to an evaporation gas treatment method of a liquid hydrogen supply system and a vehicle. Background The vehicle-mounted liquid hydrogen storage device inevitably absorbs heat from the environment due to the limitation of heat insulation performance, partial liquid hydrogen is vaporized, vaporized gas (BOG) is generated, the pressure of the storage tank is increased due to the vaporized gas, and safety is threatened. The existing evaporative gas treatment strategy is in a single mode, all subsystems (a liquid hydrogen system, a fuel cell and a power cell) work independently, and multi-mode self-adaptive management cannot be carried out according to the actual running state of a vehicle, so that the problems of low energy utilization efficiency, fuel waste and the like of the whole vehicle are caused, and the application and development of the on-board liquid hydrogen system in a fuel cell automobile are severely restricted. Disclosure of Invention The application provides an evaporated gas treatment method of a liquid hydrogen supply system and a vehicle, which are used for solving the problems of low energy utilization efficiency and fuel waste of the whole vehicle caused by the fact that the existing treatment of the evaporated gas of a vehicle-mounted liquid hydrogen storage tank cannot be adaptively managed according to the actual running state of the vehicle. An embodiment of the first aspect of the application provides an evaporation gas treatment method of a liquid hydrogen supply system, which comprises the steps of obtaining a current working state of a fuel cell, predicting evaporation gas pressure of a liquid hydrogen storage device in a preset future time period, determining a target treatment mode of evaporation gas according to the evaporation gas pressure, a target preset pressure and the current working state of the fuel cell, and treating the evaporation gas according to the target treatment mode. The method comprises the steps of obtaining the current internal temperature and the current external wall environment temperature of the liquid hydrogen storage device, calculating the current heat transfer rate of the evaporation gas of the liquid hydrogen storage device according to the current internal temperature and the current external wall environment temperature, calculating the evaporation amount of the evaporation gas in the preset future time according to the current heat transfer rate, and calculating the evaporation gas pressure of the liquid hydrogen storage device in the preset future time according to the evaporation amount of the evaporation gas in the preset future time. Optionally, the target processing mode of the evaporation gas is determined according to the evaporation gas pressure, a target preset pressure and the current working state of the fuel cell, wherein the target preset pressure comprises a first preset pressure and a second preset pressure, the target processing mode is a supply processing mode if the evaporation gas pressure is smaller than the second preset pressure and the fuel cell is in the working state, the target processing mode is a cache processing mode if the evaporation gas pressure is larger than or equal to the second preset pressure and smaller than the first preset pressure, and the target processing mode is a discharge processing mode if the evaporation gas pressure is larger than or equal to the first preset pressure. Optionally, when the evaporated gas is processed according to the supply processing mode, the method comprises the steps of determining the energy of the evaporated gas and acquiring the current required power and the available power allowance of the fuel cell, calculating the power of the liftable fuel cell when the energy of the evaporated gas is larger than the current power requirement, comparing the power of the liftable fuel cell and the available power allowance of the fuel cell, and processing the evaporated gas according to the comparison result of the power of the liftable fuel cell and the available power allowance of the fuel cell. Optionally, the processing the evaporated gas according to the comparison result of the power of the liftable fuel cell and the available power allowance of the fuel cell comprises controlling part of gas of the evaporated gas to be introduced into the fuel cell based on the power of the liftable fuel cell if the power of the liftable fuel cell is smaller than or equal to the available power allowance of the fuel cell. Optionally, in the case that the power of the liftable fuel cell is greater than the available power margin of the fuel cell, the method comprises the steps of introducing part of the evaporated gas into the fuel cell according to the real-time power requirement of the fuel cell, and disch