耦合环形炭分离器的煤化学链燃烧热态实验

Hot Model Experimental Study on Coal-fired Chemical Looping Combustion Coupled with an Annular Carbon Stripper

在煤化学链燃烧过程中,煤焦颗粒易被载氧体颗粒流携带进入空气反应器,导致系统碳捕集效率降低.针对煤焦与载氧体二元颗粒分离问题,提出了环形炭分离器与燃料反应器耦合设计,搭建并运行了耦合环形炭分离器的煤化学链燃烧热态实验系统.实验结果表明,反应器实现了稳定且循环量可控的高温固体循环、合理的压差平衡、稳定的温度分布以及稳定连续的给煤运行.基于环形炭分离器的分离作用,可有效避免煤焦进入空气反应器,其出口CO_2体积分数低至0.75%左右(环形区域气速为1.4 m/s),进而提高系统碳捕集效率.

In coal-fired chemical looping combustion(CLC),char particles are easily carried into the air reactor(AR)by an oxygen carrier particle flow,thereby decreasing the carbon capture efficiency.In the present work,we proposed an integrated design of an annular carbon stripper(CS)and fuel reactor(FR)and built a hot model system of coal-fired CLC coupled with the annular CS.The operating results indicated that the system can achieve controllable and stable solid circulation at a high temperature,reasonable pressure balance,constant temperature profile,and stable continuous coal feed.Due to the effective separation of the annular CS,limited amounts of char were carried into the AR,and the CO2 concentration at the AR outlet decreased to about 0.75%at an annular zone gas velocity of 1.4 m/s.