Reduction mechanism of NO<sub>x</sub> by coal gas produced in a 130 t powder coal burner and coupling CFD calculation

党帅

doi:10.3969/j.issn.0438-1157.2012.08.029

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Reduction mechanism of NO_x by coal gas produced in a 130 t powder coal burner and coupling CFD calculation

更新时间：2025-12-10

- Reduction mechanism of NO_x by coal gas produced in a 130 t powder coal burner and coupling CFD calculation
- CIESC Journal Issue 8, Pages: 2544-2550(2012)
- 作者机构：
  
  热科学与动力工程教育部重点实验室，清华大学航天航空学院,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.08.029
  CLC：
- Online First：05 August 2012，
  
  Published：05 August 2012
- 稿件说明：
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党帅. Reduction mechanism of NO_x by coal gas produced in a 130 t powder coal burner and coupling CFD calculation[J]. CIESC Journal, 2012, (8): 2544-2550. DOI: 10.3969/j.issn.0438-1157.2012.08.029.
DOI：

党帅. Reduction mechanism of NO_x by coal gas produced in a 130 t powder coal burner and coupling CFD calculation[J]. CIESC Journal, 2012, (8): 2544-2550. DOI: 10.3969/j.issn.0438-1157.2012.08.029. DOI：

摘要

在没有气源的电厂，可以采用煤制气再燃低NOx燃烧技术，即采用空气和水蒸气作为气化介质，在1000℃以下进行气化得到煤制气，实现部分煤气化再燃低NOx燃烧技术。本文选用GRI3.0反应机理，简化后得到了适用于NOx还原计算的简化机理，包括26个组分和63个反应，对130 t煤粉炉进行了多步反应机理和CFD耦合计算的尝试，并对还原气喷口和还原气比例进行了设计计算，提出了改造设计方案，可实现NOx还原率超过80%。计算结果表明，采用部分煤制成再燃气燃烧没有明显影响煤的燃尽率；130 t煤粉炉设计的三次风喷口应该上移3 m，以增加再燃反应时间；再燃气比例可设计为30%，以增加NOx还原效果。

Abstract

In power plants having no gas source，a feasible option is that re-burning of coal gas produced in powder coal burner to reduce emission of NOx，i.e.in order to the coal gas，using air and water vapor as medium to gasify a part of coal below 1000℃.In this paper GRI3.0 mechanism is selected and after simplifying a multi-step mechanism including 26 species and 63 reactions is got for simulating a 130 t powder coal burner.The design calculation of the inlet and the ratio of re-burning gas are done and a alteration design that can make 80% reduction of NOx is proposed.The results show that the re-burning does not have significant influence on burnout ratio of coal.The inlet of the third air wind should be moved up 3 m to increase the reduction time of NOx.The ratio of re-burning gas should be controlled at 30% to strengthen its reduction performance.

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Reduction mechanism of NOx by coal gas produced in a 130 t powder coal burner and coupling CFD calculation

DOI：10.3969/j.issn.0438-1157.2012.08.029

摘要

Abstract

关键词

Keywords

references

Reduction mechanism of NO_x by coal gas produced in a 130 t powder coal burner and coupling CFD calculation