生物质气在SOFCs中的循环系统设计及原理

设计了一种生物质气在固体氧化物燃料电池堆(SOFCs)中的循环流程.在本技术中,生物质气的主要成分甲烷首先被熔融盐中的晶格氧部分氧化为H2和CO,生物质气中的杂质S和重金属被熔融盐吸收;CO和H2在SOFCs阳极室被电化学氧化为CO2和H20,反应释放的大部分能量转化为电能;大部分CO2在特定温度下,经可再生材料Li4SiO4吸收、解吸被提纯回收.少量CO2和H2O被循环到熔融盐池与甲烷发生重整反应,反应所需要的热量由甲烷部分氧化释放的热量提供.本系统中SOFCs抗积碳及对含S和N燃料的容忍性比较好;整个系统能量利用率高,可以实现CO2的零排放.

Design and principle of cyclic system for biogas in solid oxide fuel cells

A cyclic system for biogas in solid fuel cells (SOFCs) was designed. The main composition methane in biogas was partially oxidized to be CO and H2 syngas by lattice oxygen in molten salt, the impurities sulfur and heavy metals in biogas were absorbed into molten salt and which prevented the anodic catalyst to be poisoned. There was no other but CO2 and H2O products in the electrochemical oxidation reactions of CO and H2 in the anode chamber of SOFCs. Pure CO2 was obtained after which was captured by reusable material Li4SiO4 and desorbed at some special temperatures. A small amount of CO2 and H2O was fed again into molten salt and reacted with methane, the thermal energy for this reforming reaction was supplied by the partial oxidation of methane. Compare to the reforming of methane in SOFCs, this technique has many advantages such as no carbon deposition, better tolerance to S and N, higher energy-utilization rate and zero emission of greenhouse gas.