煤浆浓度对水煤浆气化影响的数值模拟

采用数值方法模拟了应用于IGCC的水煤浆气化过程中煤浆浓度对出口煤气成分以及碳转化率的影响效果。总结了在具有复杂化学反应的高温、高压容器中,对水煤浆气化过程的数值模拟时经常遇到的问题和解决方法。得到了气化炉内的温度场、流场、浓度场以及出口粗煤气成分,其结果与工程实际相比非常接近;并利用得到的结果分析了影响水煤浆气化过程和出口煤气成分的主要因素之一的煤浆浓度,提出了提高出口煤气有效成分(CO H2)的措施。图7表1参8

Numerical Simulation of the Effect of Coal-Water-Slurry's Concentration on its Gasification Process

Numerical simulation is used to simulate the effect of coal-water-slurry's(CWS) concentration on the chemical constitution of the leaving gas as well as on the carbon transformation ratio during the CWS gasification processes in IGCC. An epitome of generally met problems concerning numerical simulation of gasification of CWS in high temperature and high pressure reactors, where complex chemical reactions take place, is presented, accompanied by comments on ways of solving them. The calculated temperature, and flow fields as well as the composition of the raw gas at exit agree quite well with those observed in actual engineering cases. Results thus obtained are used to analyze the effect of CWS concentration, as one of the main influencing factors, on the gasification process and on the composition of raw gas at exit together with ways of raising the percentage of effective components(CO H_2) in the delivered coal gas. Figs 7, table 1 and refs 8.