第二代增压流化床煤部分气化炉单元中间试验研究

Experimental study on a pilot-scale second generation pressurized fluidized bed coal gasifier

在热输入为2MW加压喷动流化床煤部分气化中试试验装置上,对所构建的煤气化试验系统进行了工艺及装置试验研究,在此基础上进行了连续12h的煤部分气化试验,以考察工艺参数对气化行为的影响.试验结果表明中试装置的各分系统设计合理,全系统能协调稳定运行,能为第二代增压流化床联合循环发电系统(2GPFBCCC)的下游单元提供合格的煤气和半焦;在较高的气化温度下,煤气中甲烷质量分数由于二次热解而降低,碳转化率增加;提高了入炉的蒸汽量,煤气中氢气质量分数明显上升.

Coal gasification process and equipment feasibility research were carried out in a 2 MW thermal input pressurized spout-fluid bed pilot-scale gasifier and a long-time-run test was performed to study the influence of operating parameters on coal partial gasification behavior. The test results demonstrate the feasibility of the gasifier which can provide suitable fuel gas and residual char for downstream system of second generation pressurized fluidized bed combined cycle (2G PFBC-CC). The concentration of methane decreases at higher gasification temperature due to the secondary cracking of methane while the carbon conversion increases, and the concentration of hydrogen increases with an increase of steam flow rate.