以CuO为氧载体处理市政污泥的化学链燃烧

Combustion Characteristics of Sludge Chemical Chain of CuO as Oxygen Carrier

基于双极燃料反应器的化学链燃烧装置,以CuO为氧载体,对污泥化学链燃烧进行实验研究。反应器稳定运行,以反应器温度(750℃～850℃)、不同质量分数的CuO(0～100%)为参数,热重分析法和HSC热力学模拟为方法,探究对污泥化学链燃烧性能的影响。研究表明,温度的增加、碳转化率和CO_2的捕获效率升高,降低了出口烟气中可燃性气体的浓度。污泥的着火温度为Ti=267.5℃,挥发分特性指数为D=2.6×10-5,有效降低了污泥样品反应的初始热解温度,加快污泥样品的处理速度。加入足量的氧载体CuO加快了碳转化速率,有效消耗了产生CO所需的反应物,提高了出口气体中CO_2的含量,占比高达99.8%,未产生副产物有毒有害气体CO。SEM表征显示,氧载体由于释放晶格氧形成了空腔的结构,有利于再次氧化形成新的氧载体,具有较好的循环稳定性。

Based on the chemical chain combustion device of a bipolar fuel reactor, CuO is used as an oxygen carrier to conduct experimental research on sludge chemical chain combustion. The reactor is operated stably. The reactor temperature (750~850℃) and different mass fractions of CuO (0-100%) are used as parameters. Thermogravimetric analysis and HSC thermodynamic simulation are used to explore the combustion properties of sludge chemical chain. influences. Studies have shown that the increase in temperature, carbon conversion rate and CO2 capture efficiency increase;reduce the concentration of flammable gases in the outlet flue gas. The ignition temperature of the sludge is Ti=267.5℃, and the volatile matter characteristic index is D=2.6×10^-5, which effectively reduces the initial pyrolysis temperature of the sludge sample reaction and accelerates the processing speed of the sludge sample. The addition of a sufficient amount of oxygen carrier CuO accelerates the carbon conversion rate;effectively consumes the reactants required for the production of CO;increases the content of CO2 in the outlet gas, which accounts for 99.8%;does not produce toxic and harmful gas CO as a by-product. SEM characterization shows that the oxygen carrier forms a cavity structure due to the release of lattice oxygen, which is beneficial for reoxidation to form a new oxygen carrier, which has better cycle stability.