Experimental Study on Two-Stage Modification, Combustion and NOx Emission Characteristics of Pulverized Coal in a Purification-Combustion Reaction System

  • SU Kun ,
  • OUYANG Ziqu ,
  • WANG Hongshuai ,
  • HU Yujie ,
  • DING Hongliang ,
  • ZHANG Jinyang ,
  • ZHU Shujun
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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    3. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

网络出版日期: 2025-07-04

基金资助

CAS Project for Young Scientists in Basic Research (YSBR-028), Youth Innovation Promotion Association (CAS2019148), and the Strategic Priority Research Program (XDA29010200) are gratefully acknowledged.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Experimental Study on Two-Stage Modification, Combustion and NOx Emission Characteristics of Pulverized Coal in a Purification-Combustion Reaction System

  • SU Kun ,
  • OUYANG Ziqu ,
  • WANG Hongshuai ,
  • HU Yujie ,
  • DING Hongliang ,
  • ZHANG Jinyang ,
  • ZHU Shujun
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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    3. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China

Online published: 2025-07-04

Supported by

CAS Project for Young Scientists in Basic Research (YSBR-028), Youth Innovation Promotion Association (CAS2019148), and the Strategic Priority Research Program (XDA29010200) are gratefully acknowledged.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

摘要

为了实现对NOx的深度控制,在30 kW净化燃烧实验台上,研究了由脱挥发剂、旋流燃烧器和下燃燃烧器组成的净化燃烧系统,并探讨了一次风比和二次风比(λpλ2)对煤粉两级改性、燃烧和NOx排放的影响。在脱挥发器和旋流燃烧器中,随着λpλ2的升高,不同位置的温度升高。增加λp,而不增加λ2,可以改变旋流燃烧器主燃烧区的位置。CO和H2是改性气体中主要的可燃组分,其浓度随λp和λ2的增加而降低。相反,CH4浓度极低。由脱挥发剂和旋流燃烧器组成的净化系统在提高煤粉的比表面积、孔体积、孔径和燃料转化率以及改善其碳微晶结构等方面都优于单级脱挥发剂,并且随着系统中λpλ2的适当增加,改性后的煤粉的这些指标也越来越好。在降燃燃烧室中,随着λpλ2的升高,还原区温度变化不大,完全燃烧区温度仅在较低λ2处下降。适当提高λpλ2可有效降低NOx排放,效率达99.00%以上,但λ2对NOx排放的抑制作用有限。

本文引用格式

SU Kun , OUYANG Ziqu , WANG Hongshuai , HU Yujie , DING Hongliang , ZHANG Jinyang , ZHU Shujun . Experimental Study on Two-Stage Modification, Combustion and NOx Emission Characteristics of Pulverized Coal in a Purification-Combustion Reaction System[J]. 热科学学报, 2025 , 34(4) : 1483 -1496 . DOI: 10.1007/s11630-025-2108-3

Abstract

To achieve deep NOx control, we investigated a purification-combustion system consisting of devolatilizer, swirl burner and down-fired combustor, and explored the influences of primary and secondary air ratios (λp and λ2) on two-stage modification, combustion and NOx emission of pulverized coal in a 30 kW purification-combustion experimental bench. In devolatilizer and swirl burner, the temperature in different positions increases with λp and λ2 rising. Moreover, the location of main burning zone in swirl burner could be changed by increasing λp rather than λ2. CO and H2 are the main burnable components in modified gases, and their concentrations decrease with λp and λ2 increasing. By contrast, the CH4 concentration is extremely low. Purification system composed of devolatilizer and swirl burner outperformed single-stage devolatilizer in increasing specific surface area, pore volume, pore diameter and fuel conversion rate of pulverized coal as well as improving its carbon microcrystalline structure, and these indexes of modified char are better and better with λp and λ2 increasing properly in this system. In down-fired combustor, as λp and λ2 increase, the temperature changes slightly in reduction region, while it decreases in complete combustion region only at lower λ2. Properly rising λp and λ2 will reduce the NOx emission with high efficiency of above 99.00%, but the emission reduction driven by λ2 is limited.

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