气化炉辐射废热锅炉优化计算

Optimization calculation on gasifier radiant syngas cooler

以某气流床气化配显热回收系统流程热力学模拟结果为基础,从单元布置、工艺流程等方面阐述系统方案,并将气化炉废锅动力学校核模拟计算的结果与设计参数及实际运行测量参数进行对比,以验证所选模型及相关设置的正确性。利用校核后的动力学模型对系统中用于回收合成气高品位热的辐射锅炉进行结构尺寸的优化计算与分析,使其满足系统流程废热锅炉各受热面工质进出口参数要求,同时使其有效避免结渣发生。由优化模拟计算结果可知:从加工制造、运输及灰污参数等角度考虑,1.8m内水冷壁直径的设计结构更为合理,其拐点温度、出口温度均较为合理;入口处设置滴水崖,入口内水冷壁上部做成锥台或圆弧结构,从数值模拟角度可看出直径大于150μm的粒子与内水冷壁壁面碰撞的概率较小。

Based on the thermodynamic simulation results of entrained bed gasifier with sensible heat recovery system,and from aspects such as units layout,process flow and so on,the system plan was demonstrated,the results of simulation calculation of gasifier syngas cooler dynamic check and actual operation measurement parameters were compared,in order to verify correctness of the chosen model and relative installation.The dynamic model after check to do optimization calculation and analysis of structure dimension of radiant syngas cooler which was used for high-grade recycling of syngas was used,which could make it meet the parameter requirements of each heating surface working medium inlet and outlet in syngas cooler system process,and at the same time,avoid the occurrence of slagging.The optimization results showed that considering the manufacturing,transportation and slagging,making the design of the syngas cooler inner diameter at 1.8m was more reasonable.Inflection point temperature and outlet temperature were all reasonable as well.Drip cliff was set at the inlet,water cooled wall in inlet should be Cone or arc structure,it also can be seen from Numerical simulation that the probability of collision between the inner wall and the particles whose diameter were larger than 150μm was very small.