气化细渣目前以堆放填埋为主，环保压力大，如何高效利用低热值气化细渣是关注热点。合成甲醇和煤油的煤气化工艺排出的2种气化细渣总量较大、处理困难。对2种气化细渣进行粒径分析及SEM观察，发现气化细渣粒径较小，大部分小于100 μm，整体结构破碎，由较多熔融聚合形成的球形颗粒和不规则孔隙构成。掺烧是利用低热值燃料的有效手段，将气化细渣与煤、生物质以不同比例掺烧，分析其燃烧特性，并用Coats-Redfern方法进行动力学特性分析。结果表明，气化细渣与煤、生物质掺烧可大幅提高气化细渣燃烧性能，降低燃烧所需活化能。纯甲醇渣、煤油渣燃烧所需活化能分别为105.10和100.80 kJ/mol，甲醇渣、煤油渣与煤掺烧后，气化细渣掺烧比例为30%时，综合燃烧特性指数最高，分别为23.64×108和25.96×108；活化能最低，分别为89.46和83.76 kJ/mol。气化细渣内含丰富孔隙结构，一定比例的气化细渣与煤掺烧可增大可燃物质与空气的接触面积，利于气体吸附扩散，缩短燃烧达到最大燃烧速率的时间，提前达到最大燃烧强度。甲醇渣、煤油渣与生物质掺烧，气化细渣掺烧比例为30%时，活化能最小，分别为72.14、69.59 kJ/mol，生物质的燃烧温度区间低于气化细渣，可对气化细渣燃烧过程起预热作用，显著降低气化细渣固定碳燃烧所需活化能。

Gasification fine slag is mainly stacked and landfilled at present,and the pressure of environmental protection is high. How to efficiently utilize gasification fine slag with low calorific value is a hotspot at present. The total amount of the two kinds of gasification fine slag discharged from the gasification process of methanol synthesis and kerosene is large, which is difficult to dispose. Through particle size analysis and SEM observation of two kinds of gasification fine slag, it is found that the particle size of gasification fine slag is small, most of which is less than 100 μm. The structure of gasification fine slag is broken, consisting of many spherical particles formed by melt polymerization and irregular pores. Co-firing is an effective method to use low calorific value fuels. The gasification slag was mixed with coal and biomass in different proportions to analyze the combustion characteristics, and the Coats-Refern method was used to analyze the kinetic characteristics. It is found that cofiring of gasification fine slag with coal and biomass can greatly improve the combustibility of gasification fine slag and reduce the activation energy for combustion. The activation energy of methanol slag and kerosene slag is 105.10 kJ/mol and 100.80 kJ/mol respectively. When the proportion of gasification fine slag is 30% after mixed combustion of methanol residue, kerosene residue and coal, the comprehensive combustion characteristic index is the highest, which is 23.64×108 and 25.96×108 respectively. Meanwhile, the activation energy is the lowest, which is 89.46 and 83.76 kJ/mol respectively. The gasification fine slag con tains abundant pore structure. A certain proportion of gasification fine slag mixed with coal can increase the contact area between combustible materials and air, facilitate gas adsorption and diffusion, shorten the time to reach the maximum combustion rate, and advance the maximum combustion intensity. The activation energy of methanol slag and kerosene slag cofiring with biomass is the lowest when the proportion of gasification fine slag is 30%, which is 72.14 and 69.59 kJ/mol respectively. The combustion temperature of biomass is lower than that of gasification fine slag, which can preheat the combustion process of gasification fine slag and significantly reduce the activation energy required for fixed carbon combustion of it.

0 引言

1 热重试验

   1.1 试验材料及方法

   1.2 燃烧特性计算

   1.3 动力学理论

   1.4 基于模型的方法——Coats-Redfern积分法

2 试验结果与分析

   2.1 SEM分析

   2.2 煤和气化细渣掺烧TG、DTG曲线

   2.3 生物质和气化细渣掺烧TG、DTG曲线

   2.4 燃烧特性分析

   2.5 动力学分析

3 结论