陈娟 闫涛

摘      要：以神木市石窑店煤矿的煤为原料，不同浓度NaOH改性葵花籽皮与花生壳为生物质黏结剂，两者混捏冷压成型制备生物质型煤，而后高温干馏制备型焦。参照国标GB/T 214-2007《煤中全硫的测定方法》测定型煤型焦中全硫含量，研究了生物质型煤热解过程中硫元素的迁移特性。结果表明：生物质型煤型焦的全硫含量约0.3%左右，且型煤全硫含量均高于型焦，由于硫铁矿硫无机硫与部分有机硫的气、液相迁移造成，型焦中主要残留硫酸盐无机硫与性质稳定的噻吩有机硫。神木粉煤粒度在0.425～0.074mm范围内，型煤与型焦硫含量呈现小高峰。2.0%NaOH改性生物质型煤型焦全硫含量较1.5%、2.5%NaOH改性生物质型煤型焦全硫含量稍高。

关  键  词：硫;迁移特性;热解;型煤;型焦

中图分类号：TQ 533.1       文献标识码： A      文章编号： 1671-0460（2020）04-0544-04

Abstract： Taking coal from Shiyaodian coal mine of Shenmu city as raw material，different concentration of NaOH modified sunflower seed skin and peanut shell as biomass binder， the biomass briquette was prepared by cold pressing of two kinds of materials， and then the formed coke was prepared by high temperature distillation. Referring to GB/T 214-2007 "Method for the Determination of Total Sulfur in Coal"， the total sulfur contents in briquette and formed coke were measured， the sulfur migration characteristics in the pyrolysis process were studied. The result showed that the total sulfur contents of briquette and formed coke were about 0.3%， and the total sulfur content of briquette was higher than that of formed coke， which was caused by the gas-liquid phase migration of pyrite sulfur and some organic sulfur. Sulfate sulfur and thiophene organic sulfur were remained in formed coke. When the particle size of Shenmu pulverized coal was in the range of 0.425～0.074 mm， the sulfur contents of briquette and formed coke showed small peaks. The total sulfur content of 2.0% NaOH modified biomass briquette and formed coke was slightly higher than that of 1.5% and 2.5% NaOH modified biomass briquette and formed coke.

Key words： Sulfur; Migration characteristics; Pyrolysis; Briquette; Formed coke

我国是煤炭生产大国，更是消费大国。作为煤中的主要伴生元素，硫元素的存在严重制约着煤炭的清洁转化高效利用和煤化工产业链的延伸[1]。若用高硫煤煉焦，通过热解的方式得到焦炭、热解气和焦油，不仅排放大量污染物，严重影响焦炭质

量[2-4]。如何脱除和合理控制煤中的硫，在一定程度上使其高效、清洁利用是缓解我国能源压力的重要方法。

我国是农业大国，在生物质利用方面具有巨大的潜能。其中农作物残渣就占据了生物质总量的72.2%，玉米秸秆年产量高达2.30亿t[5]。而生物质具有低的硫含量，对于维持环境中碳的平衡具有重要意义。再者生物质与煤炭具有相同的基本元素，且是唯一能够部分替代化石能源中碳元素转化为其他能量形式的重要能源，因此将生物质与煤相结合得到越来越多的关注。……