固体热载体回转窑煤热解工艺模拟与分析 |
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引用本文: | 李初福,门卓武,翁力,刘科.固体热载体回转窑煤热解工艺模拟与分析[J].煤炭学报,2015,40(Z1):203-207. |
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作者姓名: | 李初福 门卓武 翁力 刘科 |
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作者单位: | 神华集团有限责任公司 北京低碳清洁能源研究所,北京 102209 |
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基金项目: | 国家高新技术研究发展计划(863)资助项目(2011AA05A202) |
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摘 要: | 为解决廉价丰富的碎煤高效清洁转化问题,提出一种固体热载体回转窑煤热解工艺。该工艺采用回转窑作为热解反应器,实现热载体与煤均匀混合;采用大粒度半焦作为热载体,通过机械提升循环,减小了半焦热载体的破碎,降低了粉尘控制难度。基于小试实验数据,利用Aspen Plus建立了工艺流程模型,模拟结果表明,提高干燥温度和热载体温度,可有效减少热载体循环量和废水生成量;在干燥温度200 ℃、热解温度600 ℃和热载体温度800 ℃条件下,热载体与干燥煤混合质量比为3.3∶1,焦油干基收率为7.2%,煤气干基收率为10%,系统能效达到85%以上。
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关 键 词: | 煤热解 回转窑 固体热载体 机械提升 |
收稿时间: | 2014-06-26 |
Process simulation and analysis for coal pyrolysis with rotary kiln using solid heat carrier |
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Abstract: | To achieve a clean and efficient conversion of the cheap and abundant small size coal,a coal pyrolysis process with rotary kiln using solid heat carrier was proposed.In the process,a rotary kiln was adopted as the pyrolysis reactor to get uniform mixing between the solid heat carrier and coal.In order to easily control the dust in the process,the bigger size semicoke was used as the solid heat carrier,and meanwhile a mechanical lifter was used to reduce the broken rate of solid heat carrier.Subsequently,a process model was established using Aspen Plus based on the laboratory test data.The process simulation results show it can reduce the heat carrier circulation and generate less wastewater by increasing drying temperature or heat carrier temperature.Under the conditions of drying temperature of 200 ℃,pyrolysis temperature of 600 ℃and solid heat carrier temperature of 800 ℃,the process simulation results show that the mass flowrate of solid heat carrier is about 3.3 times of dry coal to pyrolyzer,and the tar and pyrolysis gas yields are about 7.2% and 10% dry base,respectively.The energy conversion efficiency of such a process can reach above 85%. |
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Keywords: | coal pyrolysis rotary kiln solid heat carrier mechanics lifter |
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