Control And Optimization Of Fuel Cell Stack Based On Reforming Gas

Energy is the cornerstone of the development of human society.With the rapid development of modern society,the issue of sustainable use of energy has also appeared in front of human beings.At the same time,the deterioration of the environment is accelerating at the same time as the rapid development of society.Under such circumstances,mankind urgently needs a clean energy source that can be used sustainably.Hydrogen energy is such an energy that satisfies the future development of human society,and proton exchange membrane fuel cells(PEMFCs)are a relatively mature and efficient way to utilize hydrogen energy.The PEMFCs system with in-situ hydrogen production is a new energy system that avoids the problems of hydrogen storage,transportation,filling,and safety.The use of methanol reforming to supply the required hydrogen to the PEMFC enables a small integrated cell power module.However,by-product CO in the process of reforming hydrogen will inactivate the poisoning of the proton exchange membrane fuel cell.In order to enable the system to stably output electrical energy,it is necessary to implement a control method for the fuel cell to eliminate the influence of CO poisoning.In this paper,the CO poisoning behavior of PEMFCs was systematically studied.It was found that pressure,temperature and humidity played an important role in improving the performance of the cell,while temperature and humidity could reduce the impact of cell CO poisoning.Under constant current mode discharge,the addition of trace CO in anode hydrogen will lead to the oscillation of cell voltage caused by CO self-oxidation.CO poisoning can be effectively solved by anode oxygen-bleeding or electric pulse.The oxygen-bleeding regeneration can restore the cell to a maximum of 99.83% and a minimum of 50.2%.Electric pulse regeneration can restore the cell to full performance.In addition,pressure and humidity can enhance the effect of anode oxygen-bleeding and electrical pulse elimination of cell CO poisoning.Finally,based on the test results of the single cell,key components such as end plates,bipolar plates and current collecting plates of the stack are designed,and the design scheme is continuously optimized.