阅读说明：本技术 一种氢气流量计算方法 (Hydrogen flow calculation method ) 是由 刘园园 周鹏飞 张国强 周百慧 杨绍军 贾能铀 张禾 于 2020-05-15 设计创作，主要内容包括：本发明提供了一种氢气流量计算方法,所述氢气流量计算方法包括：检测燃料电池氢气系统的氢气循环管路中的气体与来自氢气源的氢气混合之前氢气循环管路中的循环气体湿度φ1；检测进入电堆前燃料电池氢气系统的氢气循环管路中的输入氢气湿度φ2；检测来自氢气源的氢气源氢气质量流量m3；根据循环气体湿度φ1、输入氢气湿度φ2和氢气源氢气质量流量m3通过质量守恒原理计算循环气体质量流量m1；根据循环气体质量流量m1和循环气体湿度φ1计算循环气体中的氢气质量流量mh。这种方法的优点在于：提供了一种通过两个温湿一体传感器测量并计算燃料电池循环路混合气体中氢气质量流量的方法,设备成本低,体积小；方法通用性高。(The invention provides a hydrogen flow calculation method, which comprises the following steps: detecting the circulating gas humidity phi 1 in a hydrogen circulating pipeline before the gas in the hydrogen circulating pipeline of the fuel cell hydrogen system is mixed with hydrogen from a hydrogen source; detecting the input hydrogen humidity phi 2 in a hydrogen circulation pipeline of a fuel cell hydrogen system before entering the galvanic pile; detecting the hydrogen mass flow m3 of the hydrogen source from the hydrogen source; calculating the mass flow m1 of the circulating gas according to the humidity phi 1 of the circulating gas, the humidity phi 2 of the input hydrogen and the mass flow m3 of the hydrogen source by using a mass conservation principle; and calculating the mass flow mh of the hydrogen in the circulating gas according to the mass flow m1 of the circulating gas and the humidity phi 1 of the circulating gas. The advantages of this method are: the method for measuring and calculating the mass flow of the hydrogen in the mixed gas of the fuel cell circulation path by the two temperature and humidity integrated sensors is low in equipment cost and small in size; the method has high universality.)

1. A hydrogen flow rate calculation method characterized by comprising a plurality of steps of:

step 1: hydrogen circulation pipeline for detecting fuel cell hydrogen systemThe humidity of the circulating gas in the hydrogen circulation line before the gas in (a) is mixed with hydrogen from the hydrogen source

Step 2: detecting input hydrogen humidity in a hydrogen circulation line of a fuel cell hydrogen system prior to entering a stack

And step 3: detecting the hydrogen mass flow m3 of the hydrogen source from the hydrogen source;

and 4, step 4: according to the humidity of the circulating gasHumidity of input hydrogenAnd the mass flow m3 of hydrogen source hydrogen is used for calculating the mass flow m1 of the circulating gas through the mass conservation principle;

and 5: according to the mass flow m1 and the humidity of the circulating gasAnd calculating the mass flow mh of the hydrogen in the circulating gas.

2. The hydrogen flow rate calculation method according to claim 1, wherein the step 4: the mass flow m1 of the circulating gas is calculated according to the humidity phi 1 of the circulating gas, the humidity phi 2 of the input hydrogen and the mass flow m3 of the hydrogen source by the mass conservation principle, and the calculation formula is

3. The hydrogen flow rate calculation method according to claim 1, wherein the step 5: according to circulating gas mass flowThe mass m1 and the humidity phi 1 of the circulating gas are used for calculating the mass flow mh of the hydrogen in the circulating gas, and the calculation formula is

4. The hydrogen flow rate calculation method according to claim 1, wherein the humidity of the circulating gas is set to be lower than the humidity of the circulating gasAnd humidity of input hydrogenThe temperature and humidity sensor is used for detecting and obtaining the temperature and humidity sensor.

5. The hydrogen flow rate calculation method according to claim 1, wherein the hydrogen source hydrogen mass flow rate m3 is detected by a flow meter.

Technical Field

The invention relates to the field of fuel cells, in particular to a hydrogen flow calculation method.

Background

The hydrogen fuel cell is a power generation device which directly converts chemical energy generated by the reaction of hydrogen and oxygen into electric energy through electrochemical reaction, has the advantages of high power generation efficiency, small environmental pollution and the like, and is widely applied to the field of automobiles. The fuel cell system comprises a galvanic pile, a hydrogen subsystem, an air subsystem and a cooling system. The hydrogen subsystem has the function of providing hydrogen with proper flow, pressure, temperature, humidity and concentration for the electric pile. In the hydrogen subsystem, a mixture of unreacted hydrogen, water vapor and a small amount of nitrogen is generally circulated to a hydrogen inlet by a hydrogen circulating pump or an ejector and the like and then enters the galvanic pile again. In practical application, it is usually necessary to obtain the flow rate of hydrogen in the circulating mixed gas of the fuel cell system so as to clearly understand the factors influencing the performance of the stack. Most of the flow meters are only suitable for testing the flow of the dry gas and only can measure the total flow of the mixed gas, and the flow of one of the mixed gases cannot be obtained; at the same time, water vapor in the mixed gas can affect the accuracy and life of the flow meter.

The following methods are known in the prior art for obtaining the hydrogen flow rate in a gas mixture: 1. the content and the type of the mixed gas can be measured by using a mass spectrometer, but the mass spectrometer has higher cost and large volume and is inconvenient to integrate on a system; CN108475796A discloses a method for determining the content of a gas component in a gas mixture recirculated and delivered through the anode or cathode of a fuel cell, the calculation of which is based on the squeezer principle, making use of the characteristics of the circulation device, and therefore the method is only applicable to the case of circulation devices with pump-like mechanical equipment; 3. patent US6881507 has designed a method that a rotary flowmeter tests the mixed gas, utilizes a hydrogen concentration sensor to test the proportion of hydrogen in the mixed gas, and then calculates the hydrogen flow, but this patent uses the rotary flowmeter, and the equipment cost is higher.

In view of the foregoing, it would be desirable to provide a hydrogen flow calculation method that overcomes the deficiencies of the prior art.

Disclosure of Invention

The present invention aims to provide a hydrogen flow rate calculation method which is able to overcome the drawbacks of the prior art. The object of the present invention is achieved by the following technical means.

One embodiment of the present invention provides a hydrogen flow rate calculation method, wherein the hydrogen flow rate calculation method includes a plurality of steps of:

step 1: detecting the humidity of circulating gas in a hydrogen circulation line of a hydrogen system of a fuel cell before mixing the gas with hydrogen from a hydrogen source

Step 2: detecting input hydrogen humidity in a hydrogen circulation line of a fuel cell hydrogen system prior to entering a stack

And step 3: detecting the hydrogen mass flow m3 of the hydrogen source from the hydrogen source;

and 4, step 4: according to the humidity of the circulating gasHumidity of input hydrogenAnd the mass flow m3 of hydrogen source hydrogen is used for calculating the mass flow m1 of the circulating gas through the mass conservation principle;

and 5: according to the mass flow m1 and the humidity of the circulating gasComputing loopMass flow mh of hydrogen in the gas.

According to the hydrogen gas flow rate calculation method provided by one of the above embodiments of the present invention, the step 4: the mass flow m1 of the circulating gas is calculated according to the humidity phi 1 of the circulating gas, the humidity phi 2 of the input hydrogen and the mass flow m3 of the hydrogen source by the mass conservation principle, and the calculation formula is

According to the hydrogen gas flow rate calculation method provided by one of the above embodiments of the present invention, the step 5: calculating the mass flow mh of the hydrogen in the circulating gas according to the mass flow m1 of the circulating gas and the humidity phi 1 of the circulating gas, wherein the calculation formula is

According to the hydrogen flow rate calculation method provided by the above-described embodiment of the present invention, the humidity of the circulating gas is calculatedAnd humidity of input hydrogenThe temperature and humidity sensor is used for detecting and obtaining the temperature and humidity sensor.

According to the hydrogen flow calculation method provided by the above one embodiment of the present invention, the hydrogen source hydrogen mass flow m3 is detected by a flow meter.

The hydrogen flow calculation method has the advantages that: the method for measuring and calculating the mass flow of the hydrogen in the mixed gas of the fuel cell circulation path through the two temperature and humidity integrated sensors is provided, a mass spectrometer is not needed, and therefore the equipment cost is low and the size is small; the method is suitable for a fuel cell hydrogen system with a circulating device being pump equipment and is also suitable for the condition that the circulating device is an ejector, and the method is high in universality.

Drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:

FIG. 1 shows a schematic diagram of a fuel cell hydrogen system according to one embodiment of the invention;

FIG. 2 shows a schematic diagram of a fuel cell hydrogen system according to another embodiment of the invention;

fig. 3 shows a flow chart of a hydrogen flow rate calculation method applicable to one embodiment of the fuel cell hydrogen system shown in fig. 1 and 2.

Detailed Description

Fig. 1-3 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and use the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will fall within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.

Fig. 1 shows a schematic diagram of a fuel cell hydrogen system according to an embodiment of the present invention. The fuel cell hydrogen system shown in fig. 1 includes a stack 100, a first pipeline 101, a circulation pump 102, a second pipeline 103, a hydrogen spray 104, a third pipeline 105, and two temperature and humidity integrated sensors 106, a hydrogen outlet of the stack 100 is communicated with the circulation pump 102 through the first pipeline 101, the circulation pump 102 is communicated with a first end of the hydrogen spray 104 through the second pipeline 103, a second end of the hydrogen spray 104 is communicated with a hydrogen source (not shown), a third end of the hydrogen spray 104 is communicated with a hydrogen inlet of the stack through the third pipeline 105, the two temperature and humidity integrated sensors 106 are respectively disposed on the second pipeline 103 and the third pipeline 105, the first pipeline 101, the circulation pump 102, the second pipeline 103, the hydrogen spray 104, and the third pipeline 105 constitute a hydrogen circulation pipeline of the fuel cell hydrogen system, and the temperature and humidity integrated sensor 106 on the second pipeline 103 is used for detecting the temperature and humidity of the fuel cell hydrogen circulation pipeline 105, and the temperature and humidity integrated sensor 106 on the second pipeline 103 is used for detecting the temperature and humidity of the fuel cell hydrogen circulation pipeline 101Circulating gas humidity in a circulating pipeline before gas in a hydrogen circulating pipeline of a fuel cell hydrogen system is mixed with hydrogen from a hydrogen sourceThe temperature and humidity integrated sensor 106 on the third pipeline 105 is used for detecting the humidity of the input hydrogen in the hydrogen circulation pipeline of the fuel cell hydrogen system before entering the electric pile

Fig. 2 shows a schematic diagram of a fuel cell hydrogen system according to another embodiment of the present invention. The fuel cell hydrogen system shown in fig. 2 includes a stack 200, a first pipeline 201, an injector 202, a second pipeline 203, and two temperature and humidity integrated sensors 204, a hydrogen outlet of the stack 200 is communicated with a first air inlet of the injector 202 through the first pipeline 201, a second air inlet of the injector 202 is communicated with a hydrogen source, an air outlet of the injector 202 is communicated with a hydrogen inlet of the stack through the second pipeline 203, the two temperature and humidity integrated sensors 106 are respectively disposed on the first pipeline 201 and the second pipeline 203, the first pipeline 201, the injector 202, and the second pipeline 203 form a hydrogen circulation pipeline of the fuel cell hydrogen system, and the temperature and humidity integrated sensor 204 on the first pipeline 201 is used for detecting the humidity of circulation gas in the circulation pipeline before the gas in the hydrogen circulation pipeline of the fuel cell hydrogen system is mixed with the hydrogen from the hydrogen sourceThe temperature and humidity integrated sensor 204 on the second pipeline 203 is used for detecting the humidity of the input hydrogen in the hydrogen circulation pipeline of the fuel cell hydrogen system before entering the electric pile

Fig. 3 shows a flow chart of a hydrogen flow rate calculation method applicable to one embodiment of the fuel cell hydrogen system shown in fig. 1 and 2. As shown in fig. 3, the hydrogen flow rate calculation method includes a plurality of steps:

step 1: detecting the humidity of circulating gas in a hydrogen circulation line of a hydrogen system of a fuel cell before mixing the gas with hydrogen from a hydrogen source

Step 2: detecting input hydrogen humidity in a hydrogen circulation line of a fuel cell hydrogen system prior to entering a stack

And step 3: detecting the hydrogen mass flow m3 of the hydrogen source from the hydrogen source;

and 4, step 4: according to the humidity of the circulating gasHumidity of input hydrogenAnd the mass flow m3 of hydrogen source hydrogen is used for calculating the mass flow m1 of the circulating gas through the mass conservation principle;

and 5: according to the mass flow m1 and the humidity of the circulating gasAnd calculating the mass flow mh of the hydrogen in the circulating gas.

According to the hydrogen gas flow rate calculation method provided by one of the above embodiments of the present invention, the step 4: the mass flow m1 of the circulating gas is calculated according to the humidity phi 1 of the circulating gas, the humidity phi 2 of the input hydrogen and the mass flow m3 of the hydrogen source by the mass conservation principle, and the calculation formula is

According to the hydrogen gas flow rate calculation method provided by one of the above embodiments of the present invention, the step 5: calculating the mass of hydrogen in the circulating gas according to the mass flow m1 of the circulating gas and the humidity phi 1 of the circulating gasFlow mh is calculated by the formula

According to the hydrogen flow rate calculation method provided by the above-described embodiment of the present invention, the humidity of the circulating gas is calculatedAnd humidity of input hydrogenThe temperature and humidity sensor is used for detecting and obtaining the temperature and humidity sensor.

According to the hydrogen flow calculation method provided by the above one embodiment of the present invention, the hydrogen source hydrogen mass flow m3 is detected by a flow meter.

The hydrogen flow calculation method has the advantages that: the method for measuring and calculating the mass flow of the hydrogen in the mixed gas of the fuel cell circulation path through the two temperature and humidity integrated sensors is provided, a mass spectrometer is not needed, and therefore the equipment cost is low and the size is small; the method is suitable for a fuel cell hydrogen system with a circulating device being pump equipment and is also suitable for the condition that the circulating device is an ejector, and the method is high in universality.

It will of course be realised that whilst the foregoing has been given by way of illustrative example of this invention, all such and other modifications and variations thereto as would be apparent to persons skilled in the art are deemed to fall within the broad scope and ambit of this invention as is herein set forth. Therefore, while this invention has been described with reference to preferred embodiments, it is not intended that the novel apparatus be limited thereby, but on the contrary, it is intended to cover various modifications and equivalent arrangements included within the broad scope of the above disclosure and the appended claims.