蓄热式催化蒸汽重整氢气发生器中蓄热体数值分析

Numerical Analysis for a Regenerative and Generative Hydrogen Unit

利用数值计算对蓄热体的换热进行分析,给出影响蓄热体换热的因素,进行优化设计,得到了更合理的结果.根据优化设计,提出了重整器运行的建议参数,包括换向时间、比表面积、陶瓷载体导热系数和陶瓷密度及其比热.计算表明,增加比表面积,可以提高蓄热体的蓄热能力并提高余热回收率.同时,计算表明,对于蓄热式催化重整器而言,燃料与水蒸汽的流动方向应采用与热烟气相同的流动方向.

It is a new type of hydrogen generator that is regenerative and can produce hydrogen by catalytic steam reforming.The generator is a key part of the device. According to the numerical simulation, we analyzed the heat transfer in the regenerator, gave the factors of heat transfer in the generator, and conducted the optimum design. The generator can be designed more reasonably and more effectively. According to optimum design, the operating parameters for reforming device including the time of changing direction, specific surface area, conductivity, density and specific heat of ceramic carrier were suggested. The computations show that with the increase of specific surface area, the regenerative energy by regenerator increases, so does recover rate of heat amount. The computations also show that for a regenerativereforming device, the flow direction of fuel and steam is the same as that of flue gas.