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Methanol-water fuel cell stack oxygen supply fan control method based on HT-PEM

A fuel cell stack and control method technology, applied in the direction of fuel cells, fuel cell additives, reactant parameter control, etc., can solve problems such as increasing oxygen supply, easy interruption of stack power generation process, and slow power increase. Achieve the effects of improving conversion efficiency, reducing preparation time, and increasing output power

Active Publication Date: 2020-01-03
西安新衡科测控技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the methanol-water fuel cell based on HT-PEM, hydrogen and oxygen are needed by the electric stack to generate electricity. The hydrogen is produced by the reforming chamber of the electric stack, and the oxygen is provided by the oxygen supply fan of the electric stack. Part of the stack reaction temperature control function, the faster the oxygen supply fan speed, the greater the oxygen intake, but the faster the reaction temperature of the stack will drop, and at the same time, the insufficient oxygen supply of the stack will cause hydrogen and a small amount of CO Insufficient response, decreased output power of the stack, high combustion room temperature of the stack and even damage, etc. Therefore, the quality of the control process of the oxygen supply fan directly determines the performance and reliability of the stack output. It is the HT-PEM The key to the control system design of methanol-water fuel cell
[0003] The control strategy of the stack oxygen supply fan of the existing HT-PEM methanol water fuel cell is relatively simple. , increase the oxygen supply; if the output power of the stack decreases, the speed of the oxygen supply fan will decrease, reducing the oxygen supply, but the disadvantages of this method are:
[0004] 1. The hydrogen conversion efficiency of methanol into liquid in the reforming chamber is not considered, resulting in insufficient oxygen supply to the stack and low output voltage when the fuel cell is close to full power generation;
[0005] 2. The influence of the speed of the oxygen supply fan on the temperature of the stack is not considered, resulting in a longer preparation time for the stack to generate power and a slower power increase;
[0006] 3. The output power and load power of the fuel cell stack are not dynamically adjusted, which causes the power generation process of the stack to be easily interrupted

Method used

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  • Methanol-water fuel cell stack oxygen supply fan control method based on HT-PEM

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Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, S1, divide the working process of the stack into the stack preheating stage, the stack stable working stage and the stack adjustment stage; set the lower limit value Tfs of the inlet temperature of the stack preheating stage min =80°C, the first limit value of the inlet temperature between the stack preheating stage and the stack stable working stage Tfs=125°C, set the inlet temperature between the stack stable working stage and the stack adjusting stage. Two limit value Tfm = 160 ℃, upper limit value Tfm of stack adjustment stage max = 168°C.

[0038] S2. In order to reduce the preparation time of the stack to generate electricity and increase the output power of the stack quickly, during the stack warm-up stage, the stack inlet temperature Tf1 is obtained once at every interval Δt by the stack inlet temperature sensor.

[0039] When the acquired stack inlet temperature Tf1min At this time, according to the obtained stack inlet temperature ...

Embodiment 2

[0045] Further, such as image 3 Shown, in the S2 step of embodiment 1, the control method of the rotating speed Sfc of oxygen fan is:

[0046] Judging the stack inlet temperature rise value ΔTf1 at every interval Δt, when ΔTf1>3°C, the stack oxygen supply fan speed Sfc remains unchanged until the stack inlet temperature value Tf1≥lower limit value Tfs min ;

[0047] When 0°Cmin .

[0048] When ΔTf1min .

Embodiment 3

[0050] Further, such as Figure 4 As shown, the control method of the rotating speed Sfc of the oxygen fan in the S4 step of embodiment 1 is: when Pfo>1.02P, Sfc>90%S, then adjust Sfc to reduce 0.01%S, Sfc=90%S, then Sfc remain unchanged until the stack output power Pfo is equal to the fuel cell load power P1. When Pfo<0.9P, Sfc<100%S, adjust Sfc to reduce 0.01%S, Sfc=100%S, then Sfc remains unchanged until the output power Pfo of the stack is equal to the load power P1 of the stack. When 0.98P<Pfo<1.02P, Sfc remains unchanged.

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Abstract

The invention discloses a methanol-water fuel cell stack oxygen supply fan control method based on HT-PEM, and the method comprises the steps of: S1, dividing a stack working process into a stack preheating stage, a stack stable working stage and a stack adjustment stage, and setting a temperature threshold value for dividing each stage; S2, dividing a stack working process into a stack preheatingstage, a stack stable working stage and a stack adjustment stage, and setting a temperature threshold value for dividing each stage; S3, dividing a stack working process into a stack preheating stage, a stack stable working stage and a stack adjustment stage, and setting a temperature threshold value for dividing each stage; S4, dividing a stack working process into a stack preheating stage, a stack stable working stage and a stack adjustment stage, and setting a temperature threshold value for dividing each stage. The output high voltage of the stack is ensured, the preparation time of stackpower generation is reduced, the output power of the stack is rapidly improved, and the situation of power generation interruption of the stack is avoided.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an HT-PEM-based method for controlling an oxygen supply fan for a methanol-water fuel cell stack. Background technique [0002] In the methanol-water fuel cell based on HT-PEM, hydrogen and oxygen are needed by the electric stack to generate electricity. The hydrogen is produced by the reforming chamber of the electric stack, and the oxygen is provided by the oxygen supply fan of the electric stack. Part of the stack reaction temperature control function, the faster the oxygen supply fan speed, the greater the oxygen intake, but the faster the reaction temperature of the stack will drop, and at the same time, the insufficient oxygen supply of the stack will cause hydrogen and a small amount of CO Insufficient response, decreased output power of the stack, high combustion room temperature of the stack and even damage, etc. Therefore, the quality of the control process of the ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04082H01M8/0432H01M8/04701H01M8/04746H01M8/0612
CPCH01M8/04201H01M8/04328H01M8/04335H01M8/04753H01M8/0618H01M8/04708Y02E60/50
Inventor 荆涛
Owner 西安新衡科测控技术有限责任公司