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以天然气为燃料,金属氧化物为载氧体,实现化学链置换燃烧(Chemical Looping Combustion-CLC)。“燃烧”气相产物H2O(汽)+CO2,冷凝水后,可分离出CO2。结合燃气蒸汽联合循环技术,实现能量的梯级利用,构成新型化学链置换燃烧联合循环,高效发电同时分离CO2。建立了化学链置换燃烧空气反应器(AR)和燃料反应器(FR)的质量平衡和能量平衡数学模型,对燃烧特性进行仿真计算。研究结果表明:载氧体氧化比率和还原比率增大,FR的出力及所需载氧体的最小量增加,使AR空气量减小;加大循环倍率或升高AR出口预设温度均使FR出口温度升高,AR空气量将更减少。这部分计算可为化学链置换燃烧技术的实验研究和系统概念设计提供基础数据。
Using natural gas as fuel and metal oxide as oxygen carrier, Chemical Looping Combustion (CLC) is realized. “Combustion” gas product H2O (steam) + CO2, condensed water, CO2 can be isolated. Combined with gas-steam combined cycle technology, cascade utilization of energy to form a new chemical chain replacement combustion combined cycle, high-efficiency power generation while separation of CO2. A mathematical model of mass balance and energy balance of chemical chain-exchange combustion air reactor (AR) and fuel reactor (FR) was established, and the combustion characteristics were simulated. The results show that: the oxygen carrier oxidation rate and the reduction ratio increase, the output of FR and the minimum required amount of oxygen carrier increase, so that the amount of AR air is reduced; increasing the circulation rate or increasing the preset temperature of the AR outlet FR outlet temperature increases, AR air volume will be more reduced. This part of the calculation can provide the basic data for the experimental research and system conceptual design of chemical chain replacement combustion technology.