CIESC Journal ›› 2023, Vol. 74 ›› Issue (2): 861-870.DOI: 10.11949/0438-1157.20221270

• Energy and environmental engineering • Previous Articles     Next Articles

Effects of torrefaction with flue gas on grindability of corn stalk

Shaozhuang WANG1(), Dunxi YU1(), Jiayi LI2, Jingkun HAN1, Xin YU1, Fangqi LIU1   

  1. 1.State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430000, Hubei, China
    2.State Pipe Network Group Southwest Pipeline Co. Ltd. Guizhou Pipe Network Co. Ltd. , Guiyang 610095, Guizhou, China
  • Received:2022-09-22 Revised:2022-11-23 Online:2023-03-21 Published:2023-02-05
  • Contact: Dunxi YU

烟气烘焙对玉米秆可磨性的影响规律研究

王绍壮1(), 于敦喜1(), 李佳忆2, 韩京昆1, 喻鑫1, 刘芳琪1   

  1. 1.华中科技大学煤燃烧国家重点实验室,湖北 武汉 430000
    2.国家管网集团西南管道有限责任公司贵州省管网有限公司,贵州 贵阳 610095
  • 通讯作者: 于敦喜
  • 作者简介:王绍壮(1999—),男,硕士研究生,775587304@qq.com
  • 基金资助:
    中国博士后科学基金项目(2021M691123)

Abstract:

Grindability is one of the issues that must be considered in the large-scale combustion of biomass in existing coal-fired units. Corn stalk was torrefied in a fixed-bed reactor at various conditions. Aiming at biomass single burning and mixed burning with coal, the effects of torrefied atmosphere, temperature on the grindability of fuel were investigated via the mortar grinder, the automatic particle size sieving instrument, the cellulose analyzer, and the Fourier transform infrared spectroscopy. The results showed that compared with torrefaction with nitrogen atmosphere, torrefaction with flue gas atmosphere improved the grindability of corn stalk to be close to that of typical power coal at lower torrefied temperature. This is because the oxidizing components in the flue gas promote the decomposition of cellulose and hemicellulose. When co-grinding, the coal particles showed the role of grinding aid to improve the grindability of corn stalks. The grindability of mixed samples was approximately or even better than that of coal at higher temperatures or flue gas torrefaction condition.

Key words: torrefaction, grindability, corn stalk, dry flue gas, wet flue gas

摘要:

可磨性是生物质在现有燃煤机组规模化燃烧利用中必须考虑的问题之一。本文基于固定床反应器对玉米秆进行烘焙预处理,针对生物质单烧和与煤混烧两种技术路线,利用臼式研磨仪、全自动粒径筛分仪、纤维素分析仪和傅里叶红外光谱,研究了不同烘焙气氛、温度对燃料可磨性的影响。结果表明,相比于氮气,烟气能够在更低的烘焙温度下使玉米秆可磨性提升至接近于典型动力用煤,主要是由于烟气中的氧化性组分促进了纤维素、半纤维素的分解。当共磨时,煤颗粒表现出助磨的作用提升了玉米秆的可磨性,在较高温度或烟气烘焙条件下,混样的可磨性近似甚至优于煤。

关键词: 烘焙, 可磨性, 玉米秆, 干烟气, 湿烟气

CLC Number: