摘要
以西部弱还原性宁夏煤为研究对象,酸洗脱灰并负载Na、Ca及Fe盐,对其进行了固定床热解过程中气相产物生成规律的研究。实验结果显示,原煤中的矿物质和Na、Ca、Fe添加物的存在均降低了煤的起始和最大分解温度,对煤的热解反应均表现出较好的促进作用;煤中原有的矿物质和添加物对煤热解气相产物形成的影响可以划分为200～550,550～750和750～1000℃三个温度区间,在各温区中的影响显示出明显不同的作用。低温时促进了CH4的生成,高温时抑制了H2的生成;除载铁煤外,累积产率均表现为H2的增大和CH4的减少,这主要受中温段热解结果的影响;煤中矿物质及Ca在整个热解过程中均使CO和CO2累积产率增大,Na和Fe在较低温度区间也表现出对CO和CO2生成的促进作用,但温度较高时抑制作用明显。
Ningxia coal with weak reductibility in Western China was selected.The coal demineralized by HCl/HF solution and loaded Na,Ca and Fe salts were pyrolyzed in a fixed-bed reactor.The results from pyrolysis experiments of coals with and without additives show that minerals in raw coal and Na,Ca and Fe additives in coal demineralized all can decrease the initial and maximum temperatures of coal pyrolysis and change the composition of gaseous products from coal pyrolysis.The influence of minerals and three additives on coal pyrolysis are different at three temperature range of 200 ～ 550,550 ～ 750 and 750 ～ 1 000 ℃.The minerals and additives promote the formation of CH4 at lower temperature and restrain the formation of H2 at high temperature,but the cumulated yield of H2 is increased and that of CH4 is decreased except the coal added FeCl3,these mainly attribute to the pyrolysis results of coals in medium temperature range.The minerals and Ca additive all promote the formation of CO and CO2 in entire temperature range.Na and Fe additives have better promoting action for the formation of CO and CO2 at low temperature,but they show the performance of decreasing CO and CO2 formation at high temperature.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第8期1364-1368,共5页
Journal of China Coal Society
基金
国家自然科学基金资助项目(20776092)
山西省自然科学基金资助项目(2008011019)
山西省留学人员基金资助项目(2007-30)
关键词
添加物
煤
热解
气相产物
additives
coal
pyrolysis
gaseous products
