阅读说明：本技术 一种燃料电池系统的预热方法 (Preheating method of fuel cell system ) 是由 赵兴旺 李飞强 盛有冬 于 2021-07-26 设计创作，主要内容包括：本发明提供了一种燃料电池系统的预热方法,涉及燃料电池技术领域。本发明提供的燃料电池系统的预热方法,包括判断是否是低温模式,若否,则按照peak-hold模式工作,若是,则先判断氢气喷射器是否正常工作,若是则系统正常运行,若否,则进入hold模式,预热氢气喷射器。这种方法有效解决燃料电池系统的低温环境适应性问题,方法简单、可靠。(The invention provides a preheating method of a fuel cell system, and relates to the technical field of fuel cells. The preheating method of the fuel cell system comprises the steps of judging whether the fuel cell system is in a low-temperature mode or not, if not, working according to a peak-hold mode, if so, judging whether a hydrogen injector works normally or not, if so, normally operating the system, and if not, entering the hold mode to preheat the hydrogen injector. The method effectively solves the problem of low-temperature environment adaptability of the fuel cell system, and is simple and reliable.)

1. A warm-up method of a fuel cell system, characterized by comprising the steps of:

s100: judging whether the mode is a low-temperature mode, if so, entering S300, and if not, entering S200;

s200: entering a mode I, opening a hydrogen injector (2), and entering S600;

s300: entering a mode I, opening the hydrogen injector (2), and entering S400;

s400: judging whether the hydrogen pressure at the inlet of the galvanic pile (1) reaches the target pressure within the preset time, if so, entering S600, and if not, entering S500;

s500: switching to the mode two to work, keeping for a period of time, and then entering S300;

s600: the fuel cell system enters an operation state;

setting the current of the first mode according to the first current and then according to the second current; the current of the second mode is set according to a second current, wherein the first current is the current which can open the hydrogen injector (2), and the second current is the current which can not open the hydrogen injector (2) but can heat the electromagnetic coil.

2. The warm-up method of a fuel cell system according to claim 1, wherein the specific method of determining whether the low temperature mode is selected in S100 includes: and judging according to the ambient temperature.

3. The warm-up method of a fuel cell system according to claim 2, wherein the specific method of judgment based on the ambient temperature includes: ambient temperatures below 0 ℃ are in the low temperature mode.

4. The warm-up method of a fuel cell system as defined in claim 1, wherein in the operating state of mode two in S500, the hydrogen injector (2) is not opened, but its solenoid coil generates heat, thereby serving the purpose of heating.

5. The warm-up method of a fuel cell system according to claim 6, wherein the operation state retention time of mode two in S500 is 25S to 40S.

6. The warm-up method of a fuel cell system according to claim 1, wherein the preset time in S400 is 25S to 40S, and the target pressure is 120kPa to 180 kPa.

7. The warm-up method of a fuel cell system according to claim 1, wherein the fuel cell system is normally supplied with current when entering the operation state in S600.

8. A method for warming up a fuel cell system according to any one of claims 1 to 7, wherein the fuel cell system comprises a stack (1), a hydrogen injector (2), a hydrogen storage device (3) and an air compressor (4), fresh hydrogen from the hydrogen storage device (3) enters the stack (1) after passing through the hydrogen injector (2), and air in the atmosphere enters the stack (1) after passing through the air compressor (4).

9. The fuel cell system according to claim 8, further comprising a purge solenoid valve (5), wherein the purge solenoid valve (5) is disposed on a hydrogen outlet line of the stack (1) for controlling a flow rate of hydrogen out of the stack (1).

10. The fuel cell system according to claim 9, further comprising a pressure regulating valve (6), the pressure regulating valve (6) being provided on an air outlet line of the stack (1) for controlling a flow rate of air out of the stack (1).

Technical Field

The invention relates to the technical field of fuel cells, in particular to a preheating method of a fuel cell system.

Background

The proton exchange membrane fuel cell has the working principle that hydrogen and oxygen generate electrochemical reaction to generate water and output electric energy at the same time. Because the voltage of the fuel cell is usually less than 1V, in practical application, hundreds of single cells need to be connected in series to form a fuel cell stack and matched with corresponding peripheral accessories to form a fuel cell system.

The existing fuel cell system usually adopts an electric control hydrogen injection mode to control the pressure and flow of hydrogen entering the stack on the hydrogen side, and usually adopts a hydrogen injector. However, in a low-temperature environment, there is a possibility that the hydrogen injector may not be normally opened due to nozzle fogging or the influence of electromagnetic parameters, electrical parameters, or the like.

Therefore, it is desirable to provide a warm-up method for a fuel cell system to solve the technical problem in the prior art that the hydrogen injector cannot be normally opened in a low temperature environment.

Disclosure of Invention

The invention aims to provide a preheating method of a fuel cell system, which can effectively solve the problem of low-temperature environment adaptability of the fuel cell system and is simple and reliable.

In order to realize the purpose, the following technical scheme is provided:

the invention also provides a preheating method of the fuel cell system, which comprises the following steps:

s100: judging whether the mode is a low-temperature mode, if so, entering S300, and if not, entering S200;

s200: entering a mode I, opening a hydrogen injector, and entering S600;

s300: entering a mode I, opening a hydrogen injector, and entering S400;

s400: judging whether the hydrogen pressure at the inlet of the galvanic pile reaches the target pressure within preset time, if so, entering S600, and if not, entering S500;

s500: switching to the mode two to work, keeping for a period of time, and then entering S300;

s600: the fuel cell system enters an operation state;

setting the current of the first mode according to the first current and then according to the second current; the current of the second mode is set according to a second current, wherein the first current is a current which can open the hydrogen injector, and the second current is a current which can not open the hydrogen injector but can heat the electromagnetic coil.

Further, the specific method for determining whether the mode is the low temperature mode in S100 includes: and judging according to the ambient temperature.

Further, the specific method for judging according to the ambient temperature comprises the following steps: ambient temperatures below 0 ℃ are in the low temperature mode.

Further, in the operating state of mode two in S500, the hydrogen injector is not opened, but the solenoid thereof generates heat, thereby achieving the purpose of heating.

Further, the retention time of the working state of the mode two in the S500 is 25S-40S.

Further, the preset time in S400 is 25S-40S, and the target pressure is 120kPa-180 kPa.

Further, when the fuel cell system enters the operating state in S600, the current can be normally applied.

Furthermore, the fuel cell system comprises an electric pile, a hydrogen ejector, a hydrogen storage device and an air compressor, wherein fresh hydrogen from the hydrogen storage device enters the electric pile after passing through the hydrogen ejector, and air in the atmosphere enters the electric pile after passing through the air compressor.

Further, the fuel cell system further comprises a purge solenoid valve, wherein the purge solenoid valve is arranged on a hydrogen outlet pipeline of the electric pile and is used for controlling the flow of the hydrogen out of the electric pile.

Further, the fuel cell system further comprises a pressure regulating valve, wherein the pressure regulating valve is arranged on an air outlet pipeline of the electric pile and used for controlling the flow rate of air coming out of the electric pile.

Compared with the prior art, the preheating method of the fuel cell system comprises the steps of judging whether the fuel cell system is in a low-temperature mode or not, if not, working according to a peak-hold mode, if so, judging whether a hydrogen injector works normally or not, if so, normally running the system, and if not, entering the hold mode to preheat the hydrogen injector. The preheating method effectively solves the problem of low-temperature environment adaptability of the fuel cell system, and is simple and reliable.

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.

Drawings

The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.

Fig. 1 is a block diagram showing a fuel cell system of an embodiment of the invention;

fig. 2 is a schematic diagram showing a mode one and a mode two of a fuel cell system of an embodiment of the invention;

fig. 3 shows a flowchart of a warm-up method of the fuel cell system of the embodiment of the invention.

Reference numerals:

1-electric pile; 2-a hydrogen gas injector; 3-a hydrogen storage device; 4, an air compressor; 5-purging the electromagnetic valve; 6-pressure regulating valve.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.

As shown in fig. 1, the embodiment provides a fuel cell system, which includes an electric pile 1, a hydrogen injector 2, a hydrogen storage device 3 and an air compressor 4, wherein fresh hydrogen from the hydrogen storage device 3 passes through the hydrogen injector 2 and then enters the electric pile 1, and air in the atmosphere passes through the air compressor 4 and then enters the electric pile 1.

Further, the fuel cell system further includes a purge solenoid valve 5, and the purge solenoid valve 5 is disposed on the hydrogen outlet pipe of the stack 1, and is configured to control the flow rate of hydrogen exiting from the stack 1.

Further, the fuel cell system further includes a pressure regulating valve 6, and the pressure regulating valve 6 is provided on an air outlet pipe of the stack 1 for controlling the flow rate of air coming out of the stack 1.

The present embodiment also provides a warm-up method of the above fuel cell system, as shown in fig. 3, the warm-up method includes the following steps:

s100: starting;

s200: judging whether the mode is a low-temperature mode, if so, entering S400, and if not, entering S300, specifically judging according to the ambient temperature, and more specifically, judging that the mode is the low-temperature mode if the ambient temperature is lower than 0 ℃;

s300: the first mode is entered, in which the hydrogen injector 2 is opened, and the classification of the modes is shown in fig. 2, where the first mode includes waveforms synthesized by (i) and (ii), that is, the driving current of the hydrogen injector 2 is set according to a mode of peak first and hold last. The peak state is a current that can turn on the hydrogen injector 2, the hold state is a current that can turn on the hydrogen injector 2, and the second current is a current that can not turn on the hydrogen injector 2 but can heat the solenoid coil. Specifically, the peak current of the present embodiment is 8A, and the hold current is 4A;

s400: entering mode one, the hydrogen injector 2 is opened, and the process proceeds to S500;

s500: judging whether the inlet hydrogen pressure of the galvanic pile 1 reaches a target pressure within a preset time, specifically, for example, whether the inlet hydrogen pressure of the galvanic pile 1 reaches 120kPa-180kPa within 25S-40S, preferably, whether the inlet hydrogen pressure of the galvanic pile 1 reaches 150kPa within 30S, if yes, entering S700, and if no, entering S600;

s600: switching to a mode II to work and keeping for a period of time, wherein the mode II comprises waveforms synthesized by (i) and (iii), namely, the driving current of the hydrogen injector 2 is set according to a hold mode, specifically, the current of the hold is 4A, it is required to be noted that, under the current, the hydrogen injector 2 is not opened, but the electromagnetic coil of the hydrogen injector generates heat, so that the heating purpose can be achieved, specifically, for example, the heating can be maintained for 25S-40S, preferably, the electromagnetic coil of the embodiment maintains the heating for 30S, and then, the operation goes to S400;

s700: the fuel cell system enters an operation state, and current can be loaded normally.

The fuel cell system and the preheating method thereof provided by the embodiment comprise the steps of judging whether the fuel cell system is in a low-temperature mode or not, if not, working according to a peak-hold mode, if so, judging whether the hydrogen injector 2 normally works or not, if so, normally running the system, and if not, entering the hold mode to preheat the hydrogen injector 2. The preheating method effectively solves the problem of low-temperature environment adaptability of the fuel cell system, and is simple and reliable.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.