新型固定床气化模拟及验证  

Simulation and validation of new type fixed bed gasification

作　　者：王学云 臧雪晶 读刚 郭良元 WANG Xueyun;ZANG Xuejing;DU Gang;GUO Liangyuan(China Coal Research Institute,Beijing 100013,China;Coal Science and Technology Research Institute Co.,Ltd.,Beijing 100013,China;State Key Laboratory of Efficient Mining and Clean Utilization of Coal Resources,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]煤炭科学技术研究院有限公司,北京100013 [3]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《洁净煤技术》2022年第11期114-120,共7页Clean Coal Technology

基　　金：煤炭科学技术研究院有限公司科技发展基金资助项目(2021CX-I-02)。

摘　　要：为探究新型固定床气化炉工艺操作条件。选用低阶煤,煤颗粒平均粒径10 mm,加煤量35 kg/h,氧气量10 m^(3)/h,运行压力设定为0.1 MPa进行试烧试验。分别进行Fluent动力学数值模拟与Aspen Plus热力学数值模拟,与实际试烧数据对比。结果表明,Fluent模拟的上出气口CO、H_(2)、CH_(4)、CO_(2)体积分数与试烧的绝对误差分别为0.027、0.010、0.020、-0.057,下出气口CO、H_(2)、CH_(4)、CO_(2)模拟体积分数与试烧绝对误差分别为-0.038、0.007、0.003、0.037,而Aspen Plus上出气口CO、H_(2)、CH_(4)、CO_(2)模拟体积分数与试烧的绝对误差分别为0.025、-0.028、0.012、-0.009,下出气口CO、H_(2)、CH_(4)、CO_(2)模拟体积分数与试烧数值的绝对误差分别为-0.022、0.010、0.002、0.010,Aspen Plus模拟结果除上出气中H_(2)体积分数的绝对误差为-0.028,其余各组分的误差绝对值≤0.025,因此选择该模型进一步研究O_(2)流量与煤质量流量比(O_(2)/煤)及H_(2) O与煤的质量流量比(H_(2) O/煤)对煤气组成的影响。发现当O_(2)/煤为0.328,H_(2)O/煤为0.405时,上、下两段出气表现出较好的特性,热值较高,均达11 MJ/m^(3)以上,可作为气化过程中的推荐操作参数。In order to explore the operation conditions of the new fixed-bed gasifier,the numerical simulation combined with experimental data was carried out.In the experiment,low-rank coal was selected,the average particle size of coal was 10 mm,the coal dosage was 35 kg/h,the oxygen dosage was 10 m^(3)/h,and the operating pressure was set as 0.1 MPa to carry out the gasification test and get the data.Fluent dynamics numerical simulation and Aspen Plus thermodynamic numerical simulation were carried out respectively,which was com⁃pared with the actual test firing data.The results show that the absolute errors and the experimental values of the volume fractions of CO,H_(2),CH_(4) and CO_(2) in the upper outlet simulated by Fluent are 0.027,0.010,0.020,-0.057,respectively.The absolute errors between the simulated volume fractions and the test values of CO,H_(2),CH_(4) and CO_(2) at the lower outlet are-0.038,0.007,0.003 and 0.037,respec⁃tively.The absolute errors of the volume fractions and the experimental values of CO,H_(2),CH_(4) and CO_(2) at the upper outlet simulated by Aspen Plus and the experimental values are 0.025,-0.028,0.012 and-0.009,respectively.The absolute errors between the simulated and tested values of CO,H_(2),CH_(4) and CO_(2) at the lower outlet are-0.022,0.010,0.002 and 0.010,respectively.Aspen Plus simulation results show that the absolute error of H_(2) volume fraction in the upper outlet gas is-0.028,and the absolute error of other components is≤0.025.Therefore,this model is selected to further study the influence of O_(2) flow rate to coal mass flow ratio(O_(2)/coal)and H_(2)O to coal mass flow ratio(H_(2)O/coal)on gas composition.It is found that when O_(2)/coal is 0.328 and H_(2)O/coal is 0.405,the gas output in the upper and lower sections exhibits good characteristics,and the heating value is higher than 11 MJ/m^(3),which can be used as the rec⁃ommended operating parameters in the gasification process.

关 键 词：低阶煤 分段式气化 新型固定床气化 小试试验 

分 类 号：TQ53[化学工程—煤化学工程] TK114[动力工程及工程热物理—热能工程]