【摘要】 依据流态化理论 ,对用于高温气体净化的逆流式移动床颗粒层过滤器内的流动过程分析表明 ,过滤器和循环清灰系统的结构对过滤性能有较大的影响 ,过滤器内流动形态和气流之间的压力平衡主要受颗粒层内压力梯度的影响 .设计理论的正确性在热煤气实验中得到了验证 .热煤气考核实验表明 ,所设计的结构较容易达到气流之间的压力平衡 ,移动床颗粒层过滤器在高温高压下能够实现过滤与循环清灰的一体化稳定运行 ,且过滤效率达 99 6 5 %～ 99 80 % ,但细微尘粒的捕集效率有待于进一步提高更多还原

【Abstract】 Moving granular bed filter is one of the most promising hot gas dust removal devices for integrated gasification combined cycle(IGCC) and pressurized fluidized bed combustion-combined cycle(PFBC-CC). The flow pattern of moving granular bed is studied with fluidization theory. It is found that the structures of filter and media circulation system have considerable influence on the filter performance. The pressure gradient on granular layer is the main factor affecting the flow pattern and the pressure balance between gas streams. A moving granular bed filter system is fabricated and tested in a pilot-plant-scale gasifier. On account of a great deal of vapor in hot coal gas, the operating scheme is made to prevent vapor condensing. The experimental results show that the pressure balance between different currents is more easily obtained than that of old system. Moving granular bed filtration and granular medium regeneration can be carried out steadily together in the condition of hot coal gas. The overall collection efficiency is high up to 99 65%～99 80%. But the grade efficiency of the fine particles should be improved further.更多还原