CIESC Journal ›› 2021, Vol. 72 ›› Issue (6): 3359-3367.DOI: 10.11949/0438-1157.20201476

• Energy and environmental engineering • Previous Articles     Next Articles

Effects of the addition of NH4H2PO4 in corn stalk on torrefaction and PM emissions in fixed bed combustion

WU Guihao1,3(),ZHU Youjian2,3(),FAN Jiyuan3,CHENG Wei3,JIANG Hao3,YANG Haiping3,CHEN Hanping3()   

  1. 1.China-EU Institute for Clean and Renewable Energy, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China
    2.School of Energy and Power Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, China
    3.State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China
  • Received:2020-10-22 Revised:2021-01-17 Online:2021-06-05 Published:2021-06-05
  • Contact: ZHU Youjian,CHEN Hanping

磷酸二氢铵对玉米秆烘焙及固定床燃烧颗粒物排放特性的影响

吴贵豪1,3(),朱有健2,3(),樊纪原3,成伟3,蒋好3,杨海平3,陈汉平3()   

  1. 1.华中科技大学中欧清洁与可再生能源学院,湖北 武汉 430074
    2.郑州轻工业大学能源与动力工程学院,河南 郑州 450002
    3.华中科技大学能源与动力工程学院煤燃烧国家重点实验室,湖北 武汉 430074
  • 通讯作者: 朱有健,陈汉平
  • 作者简介:吴贵豪(1995—),男,硕士研究生,wuguihao@hust.edu.cn
  • 基金资助:
    国家自然科学基金项目(51706210)

Abstract:

Using a vertical tube furnace reactor combined with a low-pressure impactor particle collection device, the effects of corn stalk roasting mixed with ammonium dihydrogen phosphate (NH4H2PO4) on the physical and chemical properties of roasted products and the emission of combustion particles in the fixed bed were studied. The results show that the corn stalk baking alone can effectively improve the quality of biomass, but also increase the emission of particulate matter. When baking at 300℃, PM1, PM1-2.5 and PM2.5-10 increase by 76.5%, 194.8% and 170.2%, respectively. Studies have shown that the torrefied corn stalk with NH4H2PO4 increased the ash content of solid products, but significantly reduced the O/C ratio of solid products and increased the ash-free heating value. In addition, blending NH4H2PO4 can significantly increase the release rate of Cl during torrefaction and reduce the content of Cl in the solid product. Torrefaction with NH4H2PO4 can effectively reduce the emission of particulate matter, especially PM1, and the best effect is achieved when the mixing P/K molar ratio is 1, at this case, PM1 reduces emissions by 28.8% compared to when no additive is added. Studies have shown that the introduction of NH4H2PO4 in the biomass torrefaction can promote the removal of Cl and reduce the emission of fine particles in the subsequent combustion process.

Key words: NH4H2PO4, corn stalk, torrefaction, particulate matter, emission characteristics

摘要:

使用立式管式炉反应器并结合低压撞击器颗粒物采集装置研究了玉米秆掺混磷酸二氢铵(NH4H2PO4)烘焙对烘焙产物理化性质及固定床中燃烧颗粒物排放的影响。结果表明,玉米秆单独烘焙可有效提升生物质品质,但也提升了颗粒物排放。300℃烘焙时,PM1、PM1-2.5和PM2.5-10分别增排76.5%、194.8%和170.2%。在烘焙过程掺混NH4H2PO4可进一步提质,使得固体产物灰分有不同程度的增加,显著降低固体产物的O/C比,并提高样品的无灰基热值。此外,研究发现掺混NH4H2PO4可显著提高烘焙过程Cl的释放率并降低固体产物中Cl的含量,有利于降低后续燃烧PM1的排放。在掺混比例P/K摩尔比为1时减排效果最佳,此时PM1相比无掺混时减排28.8%。结果表明在生物质烘焙过程引入NH4H2PO4可以促进Cl的脱除并减少后续燃烧过程细颗粒物的排放,是一种有前景的生物质预处理手段。

关键词: 磷酸二氢铵, 玉米秆, 烘焙, 颗粒物, 排放特性

CLC Number: