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Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor

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Chinese Journal of Chemical Engineering 2017年第4期25卷 507-515页

作者： Shuai Cheng dengguo lai Zhen Shi Leisheng Hong Jianling Zhang Xi Zeng Shiqiu Gao Guangwen Xu State Key Laboratory of Multi-phase Complex Systems institute of Process Engineering Chinese Academy of SciencesBeijing 100190China University of ChineseAcademy of Sciences Beijing 100049China AnHui University of Technology Ma'anshan 243002China

Pyrolysis of Shenmu coal was performed in fixed-bed reactors indirectly heated by reducing operating pressure and mounting internals in the reactor to explore their synergetic effects on coal pyrolysis. Mounting internals particularly designed greatly improved the heat transfer inside coal bed and raised the yield of tar *** pressure further facilitated the production of tar through its suppression of secondary reactions occurring in the reactor. The absolute increase in tar yield reached 3.33 wt% in comparison with the pyrolysis in the reactor without internals under atmospheric pressure. The obtained tar yield in the reactor with internals under reduced pressure was even higher than the yield of Gray–King assay. Through experiments in a laboratory fixed bed reactor, it was also clarified that the effect of reducing pressure is related to volatile release rate in pyrolysis. It did not obviously vary tar yield at pyrolysis temperatures below 600 °C, while the effect was evident at 650 and 700 °C but became limited again above 800 °C. Under reduced pressure the produced tar contained more aliphatics and phenols but less aromatics.

关键词： Pyrolysis Fixed-bed Reaction Coal Reducing pressure Internals

Pyrolysis characteristics of waste tire particles in fixed-bed reactor with internals

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Carbon Resources Conversion 2018年第3期1卷 228-237页

作者： Shipei Xu dengguo lai Xi Zeng Lijuan Zhang Zhennan Han Jiguang Cheng Rongcheng Wu Ondřej Mašek Guangwen Xu State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical TechnologyShenyang 110142China University of Chinese Academy of Sciences Beijing 100049China University of Edinburgh Edinburgh EH93FFScotlandUnited Kingdom

This study investigated the characteristics of pyrolysis for waste tire particles in the newly developed fixed-bed reactor with internals that are a central gas collection channel mounted inside *** a few metallic plates vertically welded on the internal wall of the reactors and extending to the region closing their central gas collection pipe *** were conducted in two laboratory fixed bed reactors with or without the *** results shown that employing internals produced more light oil at externally heating temperatures above 700℃due to the inhibited secondary reactions in the *** oil from the reactor with internals contained more aliphatic hydrocarbons and fewer aromatic hydrocarbons,leading to its higher H/C atomic ratios as for crude petroleum *** char yield was relatively stable for two beds and showed the higher heating values(HHVs)of about 23 MJ/*** gaseous product of pyrolysis mainly consisted of H2 and CH4,but the use of internals led to less pyrolysis gas through its promotion of oil production.

关键词： Pyrolysis Waste tire Fixed bed Internals Secondary reactions

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油页岩热解中间产物的反应特性

过程工程学报 2017年第6期17卷 1316-1321页

作者：李梦雅战金辉田勇赖登国刘晓星许光文中国科学院过程工程研究所多相复杂系统国家重点实验室北京100190 中国科学院大学化学与化工学院北京100049

对油页岩在不同终温热解所得半焦进行溶剂萃取,得到了热解中间产物(热解沥青)和终产物.采用气相色谱-质谱联用仪分析了热解沥青和页岩油的组成,采用热裂解-气相色谱-质谱联用仪检测了热解沥青的裂解产物,并与热解页岩油进行对比,研究了... 详细信息

对油页岩在不同终温热解所得半焦进行溶剂萃取,得到了热解中间产物(热解沥青)和终产物.采用气相色谱-质谱联用仪分析了热解沥青和页岩油的组成,采用热裂解-气相色谱-质谱联用仪检测了热解沥青的裂解产物,并与热解页岩油进行对比,研究了油页岩热解沥青的反应特性.结果表明,油页岩热解沥青在最快产油阶段生成最多且稳定存在,375℃时收率最大;375~400℃时热解产油速率最大,热解沥青收率下降,表明热解沥青在高温下不稳定,有机质生成中间产物后便转化成终产物.随热解温度升高,热解沥青中轻质组分含量增加.杂原子化合物最先从有机质上断裂进入中间产物,而热解油中烯烃化合物大部分来自有机质直接裂解,来自热解沥青裂解的较少.热解温度升高,热解沥青的裂解产物中烯烃含量增加,且热解沥青中芳香烃的长侧链易通过裂解变短.

关键词：油页岩热解中间产物反应特性

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无取向电工钢50W250冶炼与生产实践

山西冶金 2017年第5期40卷 56-59页

作者：马鹏赖朝彬邹锦忠陈登国官平平江西理工大学冶金与化学工程学院江西赣州341000 新余钢铁集团有限公司江西新余338001

介绍了新钢第二炼钢厂KR-BOF-CAS-RH-CC生产冷轧无取向电工钢50W250的情况,论述了S,P,C,Als,Si的控制措施及效果,研究了提高RH脱硫率和脱碳的方法,探究了连铸中通过合理确定结晶器下口宽度来控制铸坯的实际宽度。通过生产实践,可扩大公... 详细信息

介绍了新钢第二炼钢厂KR-BOF-CAS-RH-CC生产冷轧无取向电工钢50W250的情况,论述了S,P,C,Als,Si的控制措施及效果,研究了提高RH脱硫率和脱碳的方法,探究了连铸中通过合理确定结晶器下口宽度来控制铸坯的实际宽度。通过生产实践,可扩大公司电工钢产品覆盖面,提高公司电工钢生产控制能力,提升产品附加值、扩大产品效益。

关键词：电工钢 RH脱碳 RH脱硫顶渣改质铸坯宽度