Chlorine Release from Co-Pyrolysis of Corn Straw and Lignite in Nitrogen and Oxidative Pyrolysis

Jian Cheng, Min Xie, Li Xu, Lei Zhang and Xiaohan Ren
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Jian Cheng: Nuclear Power Division, Harbin Electric Company Limited, Harbin 150028, China
Min Xie: Hadian Power Equipment National Engineering Research Center Company, Harbin 150028, China
Li Xu: Anhui Special Equipment Inspection Institute, Hefei 230051, China
Lei Zhang: Department of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Xiaohan Ren: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China

Energies, 2021, vol. 14, issue 24, 1-15

Abstract: Elevated emissions of hydrogen chloride (HCl) from the combustion of biomass in utility boilers are a major issue because they can cause corrosion problems and deposit molten alkali chloride salts on boilers’ water tubes, resulting in further corrosion. Pyrolysis is a good pre-treatment for solving this problem. This work conducted pyrolysis and co-pyrolysis of pulverized corn straw and lignite coal in a horizontal muffle furnace, with compositions typical of power plant combustion effluents (5% O 2 , 15% CO 2 , 80% N 2 ) at different temperatures. Cl compounds were monitored in fuel, flue gas, and solid production of pyrolysis. The co-pyrolysis significantly affected Cl release from fuel. Cl release from corn straw into fuel gas was reduced during biomass co-pyrolysis with lignite. Co-pyrolysis had little influence on the release of organic Cl and KCl. Furthermore, at moderate-temperature pyrolysis, O 2 promoted HCl release, when compared with pyrolysis under a N 2 atmosphere.

Keywords: biomass; lignite coal; co-pyrolysis; Cl release; oxidative pyrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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