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化学反应工程与工艺
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神木原煤及其热解半焦的燃烧与污染物排放规律研究
1.中国石油大学(华东)新能源学院,山东 青岛 266580; 2.大连易舜绿色科技有限公司,辽宁 大连 116023
Study on Combustion and Pollutant Emission of Shenmu Raw Coal and its Pyrolytic Semi-coke
1. College of New Energy, China University of Petroleum (East China), Qingdao 266580, China 2. Dalian Yishunlvse Technology Co., Ltd, Dalian 116023, China
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摘要 为了研究原煤制半焦过程中颗粒表面官能团的变化,首先采用傅里叶变换红外光谱(FTIR)技术,对比分析了原煤与半焦中官能团的含量和类型。结果表明,原煤热解制半焦过程中,除脂肪族CH2,CH3较稳定以外,芳香族中酯、酸、醛、酮的C=O和芳核的C=C全部受热断裂、部分羟基反应生成了羧基、部分官能团中C-H被芳香环取代。这些反应活性较高的基团的减少,导致半焦相比原煤有明显的燃烧滞后性。在此基础上,利用热重–红外联用(TG-FTIR)技术,对比分析了原煤与半焦的燃烧和污染物排放规律。结果表明,相比原煤,半焦燃烧产生的灰壳较厚、透气性较差,导致其燃烧不稳定、不充分;虽然半焦中含氮、含硫物质的总量和种类更少,但由于焦炭的还原作用和大量生成的CO,半焦燃烧释放出更多的HCN,NH3和COS。
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张颢腾1
巩志强1
王振波1
郭易之2
张建强2
李国恩2
关键词 低阶煤半焦清洁燃烧热重-红外联用    
Abstract:In order to study the change of surface functional group in the process of making semi-coke from raw coal, in this work, the content and types of functional groups in raw coal and semi-coke were compared and analyzed by Fourier transform infrared spectroscopy (FTIR) firstly. The results showed that in the process of making semi-coke from raw coal, except that aliphatic CH2 and CH3 were relatively stable, in the aromatic group, the C=O of esters, acids, aldehydes and ketones and the C=C bonds of aromatic nuclei were all broken. Carboxyl groups are generated by part of hydroxyl reaction, while C-H of part of functional groups is replaced by aromatic rings. The reduction of these groups with high reactivity results in obvious combustion hysteresis of semi-coke compared with raw coal. On this basis, TG-FTIR technology was used to compare and analyze the combustion and pollutant emission characteristics of raw coal and semi-coke. The results showed that compared with raw coal, the ash shell produced by semi-coke combustion was thicker and less breathable, resulting in less stable and insufficient combustion. Although the total amount and types of nitrogen-containing and sulfur-containing substances in semi-coke were less, more HCN, NH3 and COS were released from semi-coke combustion due to coke reduction and large amount of CO generation.
Key wordsraw coal    semi-coke    clean combustion    thermogravimetry- infrared spectroscopy   
收稿日期: 2020-02-10     
基金资助:污染控制与资源再利用基础国家重点实验室基金(NO.PCRRF19023);辽宁省重点研发计划项目(项目编号2020JH2/10300099);中央高校基本科研业务费专项资金(18CX02150A)。
作者简介: 张颢腾(1996—),男,硕士研究生;巩志强(1989—),男,讲师,通讯联系人。E-mail: zhqgong@foxmail.com。
引用本文:   
张颢腾1,巩志强1,王振波1等. 神木原煤及其热解半焦的燃烧与污染物排放规律研究[J]. 化学反应工程与工艺, 2020, 36(2): 183-192.
ZHANG Haoteng1,GONG Zhiqiang1,WANG Zhenbo1 et al. Study on Combustion and Pollutant Emission of Shenmu Raw Coal and its Pyrolytic Semi-coke[J]. 化学反应工程与工艺, 2020, 36(2): 183-192.
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