化学链吸附强化气化制氢系统的热力学研究

Study on chemical looping sorption-enhanced gasification for hydrogen production by thermodynamic method

化学链气化技术被认为是一种利用固体燃料生产富氢合成气的有效途径。基于吉布斯自由能最小化原理,对煤燃料化学链气化系统性能进行了热力学研究。为了增强气化过程,加入了吸附剂,并使其在整个系统中循环,实现了对二氧化碳的吸附。进一步研究了操作参数对化学链气化系统性能和热量需求的影响。结果表明,吸附剂的加入可以显著提升氢气产量且为燃料反应器提供了一部分热量,载体循环量的适量增加可以使系统达到自热条件。

Chemical looping gasification(CLG) technology is an efficient approach for hydrogen-enriched syngas production using solid fuels. The properties of coal-fuelled CLG system is analyzed by means of thermodynamic evaluation based on the Gibbs free energy minimization. CO2 sorption-enhanced is integrated into the CLG performance by the circulation of sorbents in the system. The dependecne of the CLG performance and energy requirement on operating parameters is further studied. It is found that the addition of sorbents can efficiently improve the hydrogen yield. Meanwhile, the heat can be provided for the reaction in the fuel reactor(FR). The system can achieve the auto-thermal condition as the oxygen carrier circulation flow rate increases.