Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (1): 164-172.DOI: 10.16085/j.issn.1000-6613.2020-0478

• Energy processes and technology • Previous Articles     Next Articles

Nitrogen migration regarding the addition of iron-Ni composite additives during coal pyrolysis

Yuehua LIU1,2(), Ju SHANGGUAN1,2(), Shoujun LIU1,2,3, Song YANG2,3, Wenguang DU1,2   

  1. 1.Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
    2.Shanxi Engineering Center of Civil Clean Fuel, Taiyuan 030024, Shanxi, China
    3.College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
  • Received:2020-03-30 Online:2021-01-12 Published:2021-01-05
  • Contact: Ju SHANGGUAN

铁镍复合助剂对煤热解过程中氮迁移规律的影响

刘月华1,2(), 上官炬1,2(), 刘守军1,2,3, 杨颂2,3, 杜文广1,2   

  1. 1.太原理工大学煤科学与技术教育部和山西省重点实验室,山西 太原 030024
    2.山西省民用洁净燃料工程研究中心,山西 太原 030024
    3.太原理工大学化学化工学院,山西 太原 030024
  • 通讯作者: 上官炬
  • 作者简介:刘月华(1996—),女,硕士研究生,研究方向为煤炭清洁高效利用。E-mail:liuyuehua@greencoke.cn
  • 基金资助:
    国家自然科学基金(21878210);大气重污染成因与治理攻关项目(DQGG-0511);山西转型综改示范区自主创新项目(2016CXJJ021);煤科学与技术省部共建国家重点实验室开放基金(mkx201805)

Abstract:

In order to reduce NOx emissions in the coal combustion process, the pyrolysis experiments of coal and metal additives (FeCl3, NiCl2) were carried out in a tube furnace. The effects of additive loading, pyrolysis temperature, and adding method of additives on nitrogen migration and N2 yield were investigated, and the mechanism of compound additives was discussed. The results indicate that as the loading of the additive increases, the nitrogen removal rate and N2 yield tend to stabilize after increasing, and the loading is preferably 0.8% Fe and 1.0% Ni. In the pyrolysis temperature of 700—1000℃, the nitrogen removal rate and N2 yield increase with the increase of pyrolysis temperature. By swelling treatment of coal and the addition of composite additives, the nitrogen removal rate and N2 yield are higher than untreated coal samples. In the process of nitrogen migration during the coal pyrolysis, iron-based additives and nickel-based additives complement each other. The addition of iron-based additives increases the activity of nickel-based additives to make up for the disadvantages of single additives. Compared with the single additive, the compound additive has a stronger nitrogen removal effect and the N2 yield reaches a maximum of 39%. The Fe-Ni composite additive has a better catalytic effect on the conversion of N-5 to N2 in raw coal, as the composite additive has a stronger catalytic effect on the internal hydrogen transfer and ring opening of pyrrole. This research can provide theoretical and experimental basis for the clean utilization of coal.

Key words: iron and nickel composite additive, coal pyrolysis, nitrogen migration, nitrogen oxide

摘要:

为了减少煤炭燃烧过程中NOx的排放,在管式炉中进行了煤与金属助剂(FeCl3、NiCl2)的热解实验,研究了助剂负载量、热解温度、助剂添加方式对氮迁移及N2产率的影响并且对复合助剂作用机理进行了探讨。结果表明:随着助剂负载量的增加,氮脱除率及N2产率呈现先增加后趋于稳定的趋势,且负载量以0.8%Fe复合1.0%Ni为最佳。在700~1000℃的热解温度范围内氮脱除率及N2产率随热解温度的增加而增加。对煤进行溶胀处理添加复合助剂后,氮脱除率及N2产率要优于未经处理的煤样。铁基助剂与镍基助剂在催化煤热解氮迁移过程中形成互补,铁基助剂的添加增加了镍基助剂的活性,弥补了单助剂的劣势,且复合助剂相比于单助剂有更强的氮脱除效果并且N2产率达到最高39%。铁镍复合助剂对煤中N-5转化为N2的催化效果更加明显,因为复合助剂对吡咯的内氢转移和开环有更强的催化作用。本研究能够为煤炭洁净化利用提供理论和实验依据。

关键词: 铁镍复合助剂, 煤热解, 氮迁移, 氮氧化物

CLC Number: 

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