高砷褐煤与低砷烟煤混燃砷的挥发特性及模型

doi:10.11949/j.issn.0438-1157.20160530

摘要/Abstract

摘要：

选取典型的高砷褐煤和低砷烟煤，在一维等温燃烧实验台上进行混燃实验，研究温度（600～1100℃）和掺混比（3:1、1:1、1:3）对高砷褐煤混燃砷挥发的影响。实验结果表明：随着温度的升高，单煤及混煤燃烧砷的挥发比例逐渐增大，不同温度下混煤燃烧砷的挥发比例介于两个单煤之间，但砷的挥发比例并不是简单的加权平均，不同温度和掺混比下混煤砷的挥发比例均高于加权值，高砷褐煤中较高的挥发分含量在影响混煤焦炭燃烧的同时也促进了混煤中砷的挥发。因此，提出了综合考虑温度、掺混比和高砷褐煤影响的混煤砷挥发模型，不同温度和掺混比下的模型计算结果与实验值吻合度较好。

关键词: 高砷褐煤, 低砷烟煤, 混燃, 砷挥发, 模型

Abstract:

Arsenic volatilization characteristics during co-combustion of high arsenic lignite and low arsenic bituminous coal were carried out on an isothermal experiment system from 600℃ to 1100℃ at different blending ratios (3:1, 1:1, 1:3). The results showed that with increasing temperature, the arsenic volatilization in single and mixed coals increased gradually. The volatilization ratios of arsenic in mixed coals at various blending ratios were between two single coals, while they were larger than the weighted average values. Combined with isothermal coal combustion curves, it was found that high volatile content in lignite affected the char combustion properties in blended coals, which in turn promoted the volatilization of arsenic. Considering the effects of temperature, coal blending and the difference of coal rank, the arsenic volatilization model during mixed coal combustion was proposed. The model results fit the experimental curves well, which provided a reference for the prediction of arsenic volatility characteristics of blended coals.

Key words: high arsenic lignite, low arsenic bituminous coal, coal blending, volatilization of arsenic, modeling

中图分类号:

X511

刘慧敏, 王春波, 郭永成, 张月, 黄星智, 王家伟. 高砷褐煤与低砷烟煤混燃砷的挥发特性及模型[J]. 化工学报, 2016, 67(10): 4477-4484.

LIU Huimin, WANG Chunbo, GUO Yongcheng, ZHANG Yue, HUANG Xingzhi, WANG Jiawei. Experimental and modeling study on arsenic volatilization during co-combustion of high arsenic lignite and low arsenic bituminous coal[J]. CIESC Journal, 2016, 67(10): 4477-4484.

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