GSP干煤粉气化关键技术优化研究

Optimization on key technologies of GSP dry pulverized coal gasification

为解决GSP干煤粉气化技术出现的点火烧嘴无法点火、烧嘴端面烧损、水冷壁烧穿、粗煤气带灰严重、洗涤水固含量高等问题,对气化炉组合烧嘴和粗煤气洗涤系统进行优化改造,并对改造效果进行分析。采用高能量点火方式,提高氧气喷头的耐高温能力,通入一定比例高压蒸汽,改变点火烧嘴冷却水冷却方式,增加气液分离罐、鼓泡塔、塔盘,重新设计洗涤水流程,优化旁路闪蒸系统,设置静态混合器等方法,实现了点火烧嘴点火成功率由40%提高至98%以上,合成气含尘量由20.5mg/m^3降至0.5 mg/m^3以下,有效气产量达到143 856 m^3/h,水冷壁热损降低,气化炉运行时间延长,2012年5台气化炉的累计运行时间是2011年的2~3倍,解决了装置长期低负荷运行的技术瓶颈,实现了装置满负荷、长周期稳定运行。

In order to solve the problems in GSP dry pulverized coal gasification technology,such as ignition,water wall burner face burning,burn-through of water wall,crude gas with serious ash,and high solid content in washing water,the combination of gasifier burner and crude gas washing system were optimized and the performance was analyzed.Through the methods of high energy ignition improving hightemperature-resistance of oxygen nozzle,accessing high pressure steam,changing cooling system of cooling water in ignition burner,increasing gas liquid separation tank,bubbling tower and tray,redesign of washing water process,optimization of bypass flash system,setting the static mixer,the burner ignition success rate is increased up to more than 98% from 40%,and synthetic gas dust content is reduced to below 0.5 mg/m^3 from 20.5 mg/m^3.Effective gas production reaches up to 143 856 m^3/h,and heat loss of water cooled wall is reduced.Operating time of the gasifier in 2012 is extended 2-3 times higher than that of 2011.It solves the technical bottleneck of long-term operation of the device,and gradually makes the gasification device to achieve a full load,long period and stable operation.