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A method of operating a reforming fuel cell system

A fuel cell system and operation method technology, which is applied to fuel cells, fuel cell additives, fuel cell heat exchange, etc., can solve the problems of large volume, complex process structure, low efficiency, etc., and achieves optimized thermal management measures and efficient operation. The effect of advantage

Active Publication Date: 2021-11-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low temperature is based on Nafion-based proton exchange membrane, the working temperature is 60-80°C, and the tolerance of carbon monoxide (CO) is only 10ppm, but the concentration of CO in the mixed gas from the reformer can be as high as tens of thousands of ppm, so Need to use multi-stage purification or Pd membrane separation to reduce CO concentration, the whole system has complex process structure, large volume and low efficiency

Method used

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  • A method of operating a reforming fuel cell system
  • A method of operating a reforming fuel cell system
  • A method of operating a reforming fuel cell system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: The flow chart of methanol reforming fuel cell system is shown in figure 2 , one path of methanol is pumped into the burner 201 through the pump 211, and the heat generated by combustion is transferred to the fuel reformer 202; the other path of methanol flows into the fuel reformer 202 through the pump 212 to undergo steam reforming reaction, and the generated hydrogen enters the fuel cell stack 300: The heat generated during the operation of the electric stack is removed by the heat transfer oil, and the circulation pump 422 pumps the heat transfer oil into the electric stack, flows through the electric stack radiator 421, and then enters the electric stack again. In the process of system start-up, methanol in the combustion chamber is ignited with the help of the igniter; the heating of the stack also needs the help of the electric heater 2 423, which first conducts heat to the heat transfer oil, and the heat transfer oil then heats up the stack.

Embodiment 2

[0054] Embodiment 2: The system flow of methanol fuel cell is shown in image 3 , on the basis of Embodiment 1, the system adds an exhaust gas cooling oil heat exchanger 420 and a stack air inlet preheater 430. The exhaust gas cooling oil heat exchanger 420 can transfer part of the heat of the combustion chamber exhaust gas to the heat transfer oil during the start-up phase, and the heat transfer oil then transfers the heat to the electric stack. At the same time, the use of electric heating and exhaust heat exchange can greatly reduce the heating time of the electric stack. The function of the air inlet preheater 430 is to transfer the heat of the exhaust gas to the inlet air, so as to avoid the excessive temperature gradient in the stack from affecting its life.

Embodiment 3

[0055] Embodiment 3: the system flow of methanol fuel cell see Figure 7 . The system adopts an integrated methanol reformer, and the reformer includes: a burner 201 , a fuel reformer 202 , a burning methanol vaporization chamber 203 , a mixing chamber 204 , and a heat exchange chamber 205 . The whole reformer is carved and milled from a whole piece of aluminum alloy. In addition, the system also has an integrated heat exchanger, which includes: a vaporizer 410 , an exhaust gas cooling oil heat exchanger 420 , a reformed gas cooling chamber 440 , and an exhaust gas heat exchange chamber 450 . The whole heat exchanger makes full use of the waste heat of the combustion exhaust gas, the heat produced by the stack, the waste heat of the stack exhaust gas, and the high-temperature reformed gas to provide heat for the vaporization of methanol, and at the same time reduces the temperature of the reformed gas entering the stack to avoid high temperature damage to the membrane electr...

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Abstract

An operating method for reforming a fuel cell system. During the system startup phase, the heating device 1 provides heat for the fuel reformer, and at the same time, the heating device 2 provides heat for the heat-conducting circulating medium in the closed-loop pipeline. The heat then indirectly provides heat for the fuel cell stack; during the system operation phase, when the voltage of the fuel cell stack is higher than the set value V S , the fuel cell stack outputs externally; the heat-conducting circulating medium dissipates heat through a heat exchange device; during the shutdown phase of the system, the temperature of the fuel cell stack is reduced by increasing the flow rate of the heat-conducting circulating medium, until the stack The temperature is lower than the set value T S2 , the fuel storage device stops supplying fuel to the fuel reformer. Compared with the prior art, the operation method of the present invention makes full use of the heat energy of each grade, optimizes the thermal management measures of the system, and has obvious advantages in quick start-up and high-efficiency operation of the system.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an operating method for reforming a fuel cell system. Background technique [0002] Fuel cell is a kind of energy conversion device that directly converts fuel chemical energy into electrical energy. It has many advantages such as high efficiency, no pollution, and low noise. It has broad application prospects in the fields of power supply, backup power supply and mobile power supply. [0003] Hydrogen is the preferred fuel for fuel cells, but its large-scale application is limited due to many problems in the preparation, storage, and transportation of hydrogen. The use of liquid fuels (methanol, ethanol, diesel, etc.) to reform hydrogen production is an effective solution. [0004] At present, reforming fuel cells can be divided into two categories: low temperature and high temperature according to the operating temperature of the fuel cell. The low temperature is based o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04014H01M8/04223H01M8/04225H01M8/0612H01M8/04029
CPCY02E60/50Y02P70/50
Inventor 杨林林孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI