半水煤气净化技术的开发与应用

摘要

分析了国内间歇式固定床煤气化技术存在的问题,主要是余热回收效率低、循环洗涤水的水质差、污泥造成环境污染.针对这些问题,通过布袋除尘设施对半水煤气进行了除尘净化.改造方案为:采用布袋除尘的干式除尘工艺,分离的灰尘二次燃烧利用;通过间壁式水冷器对半水煤气进行冷却降温,并将冷凝的污水处理后综合利用.技术改造实施后,通过工艺参数优化,运行状况达到最佳,电耗下降,副产蒸汽量提高,减少了污泥产生量,节约了污泥处理费用.应用效果表明:该技术在系统运行、能量利用和安全环保等方面达到了国内领先水平,创造了较好的经济效益和环保效益.%The problems existed in the batch type fix bed coal gasification technology inland are analyzed including low efficiency of waste heat recycling,poor quality of recycling water and environmental pollution by sludge.Aiming at the mentioned problems,the process of dust removing and purification for semi-water coal gas by bag-type dust remover is applied.The reforming scheme includes the following contents:applying bag-ype dry dust removing process and utilizing the separated dust by combustion,cooling the semi-water coal gas by dividing wall type cooler,and treating and comprehensive utilizing the cooled polluted water.Through the technical reforming and optimization of processing parameters,the operation maintains optimal status,the power consumption reduces,the amount of by product steam increases and the expense of sludge treatment is saved.The effects of application show that the technical process achieves advance level inland in the aspects of system running,energy utilization and safety and environmental protection,which creates better economic benefits and environmental benefits.