燃烧和反应

Experiment Study on the High-Temperature Thermal Treatment and Ultra-Low NOx Control of Solid Waste Coal Slime in Circulating Fluidized Bed

  • SONG Guoliang ,
  • XIAO Yuan ,
  • YANG Zhao ,
  • YANG Xueting ,
  • LYU Qinggang
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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Dalian National Laboratory for Clean Energy, Dalian 116023, China

网络出版日期: 2023-12-04

基金资助

This work was financially supported by the National Key Research & Development Program of China (Grant No. 2018YFB0605002) and “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA21040100).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Experiment Study on the High-Temperature Thermal Treatment and Ultra-Low NOx Control of Solid Waste Coal Slime in Circulating Fluidized Bed

  • SONG Guoliang ,
  • XIAO Yuan ,
  • YANG Zhao ,
  • YANG Xueting ,
  • LYU Qinggang
Expand
  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Dalian National Laboratory for Clean Energy, Dalian 116023, China

Online published: 2023-12-04

Supported by

This work was financially supported by the National Key Research & Development Program of China (Grant No. 2018YFB0605002) and “Transformational Technologies for Clean Energy and Demonstration”, Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA21040100).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

煤泥是一种迫切需要被利用的固体废弃物和劣质燃料。本文尝试在循环流化床中对煤泥进行高温热处理,以实现资源化利用。本试验依托0.5 MWth中试试验台,探究了干煤泥在高温热处理过程中的燃烧特性。结果表明,干煤泥能够实现稳定的流态化燃烧,同时当过量空气系数接近1.0时,炉膛温度会更加均匀。煤泥给料位置的变化会导致干煤泥的着火方式发生相应变化,但是自返料器位置给入煤泥则有利于减少NOx排放。此外,本文还尝试通过高温后燃技术进一步控制NOx排放。结果表明高温后燃技术能够在保证燃烧效率的前提下,将NOx排放浓度降至50 mg·Nm-3以下。同时,存在一个大约为0.9的最佳炉内过量空气系数能够使煤泥的NOx排放浓度达到最小值。本文的结论对煤泥高温热处理的工业示范具有良好的参考意义。

本文引用格式

SONG Guoliang , XIAO Yuan , YANG Zhao , YANG Xueting , LYU Qinggang . Experiment Study on the High-Temperature Thermal Treatment and Ultra-Low NOx Control of Solid Waste Coal Slime in Circulating Fluidized Bed[J]. 热科学学报, 2022 , 31(6) : 2244 -2251 . DOI: 10.1007/s11630-022-1644-3

Abstract

Coal slime is a kind of solid waste and inferior fuel, which is urgently needed to utilize. In this paper, a high-temperature thermal treatment of coal slime in a circulating fluidized bed (CFB) was attempted to achieve resource utilization. In the experiment, the combustion characteristics of dried coal slime during high-temperature thermal treatment were investigated in a 0.5 MW pilot-scale CFB. The stable fluidized combustion of dried coal slime was realized. When the excess air ratio was closer to 1.0, the furnace temperatures would be uniform. The ignition method of dried coal slime was changed correspondingly while the feeding position changed. However, feeding coal slime to the loop seal was instrumental in decreasing NOx emissions. Moreover, the NOx emissions were tried to further control by the post-combustion technology. Post-combustion technology could significantly reduce NOx emissions below 50 mg·Nm–3 while ensuring combustion efficiency. Besides, it was found that there was an optimum excess air ratio in CFB of about 0.9 resulting in minimum NOx emissions of coal slime. The experiment results could well guide the industrial-scale high temperature thermal treatment of coal slime.

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