Influence of steam on chromium retention by minerals under oxy-fuel combustion

LI Xiaoyu; DONG Hui; ZHAO Xiaoping; CHEN Juan; LU Chunmei; YAO Hong

doi:10.11949/j.issn.0438-1157.20171460

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Influence of steam on chromium retention by minerals under oxy-fuel combustion

更新时间：2025-12-10

- Influence of steam on chromium retention by minerals under oxy-fuel combustion
- CIESC Journal Issue 6, Pages: 2714-2721(2018)
- 作者机构：
  
  1. 山东大学能源与动力工程学院,山东,济南,250061
  2. 华中科技大学煤燃烧国家重点实验室,湖北,武汉,430074
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20171460
  CLC： K16
- Online First：05 June 2018，
  
  Published：05 June 2018
- 稿件说明：
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LI Xiaoyu, DONG Hui, ZHAO Xiaoping, et al. Influence of steam on chromium retention by minerals under oxy-fuel combustion[J]. CIESC Journal, 2018, (6): 2714-2721.
DOI：

LI Xiaoyu, DONG Hui, ZHAO Xiaoping, et al. Influence of steam on chromium retention by minerals under oxy-fuel combustion[J]. CIESC Journal, 2018, (6): 2714-2721. DOI： 10.11949/j.issn.0438-1157.20171460.

摘要

通过沉降炉煤燃烧实验及动力学模拟研究了水蒸气对Cr转化行为的作用及水蒸气对矿物吸附剂捕集Cr的影响。研究表明，CaO及Fe2O3在空气及富氧燃烧下均能较好地捕获Cr蒸气，石灰石的作用远差于CaO及Fe2O3，高岭土无论空气还是富氧燃烧下对捕集Cr均无效果。动力学模拟表明H2O促进Cr（Ⅲ）快速转化为高价Cr蒸气CrO（OH）2、CrO2（OH）及CrO2（OH）2。富氧燃烧下H2O抑制了CaO与Cr的反应，但燃烧灰中六价铬化合物大量增加，特别是当H2O与CaO同时存在时，灰中43%的铬为六价铬。水蒸气促进了Fe2O3捕集铬化合物使其固定在灰中。富氧燃烧下水蒸气促进Cr在煤灰中富集，随着H2O浓度由8%升高至20%，灰中铬的富集率又下降，主要由于水蒸气对CaO捕集Cr的抑制作用。

Abstract

Coal combustion experiments and kinetic simulations were conducted to investigate the effect of H2O on chromium behaviors and the influence of H2O on the ability of absorbents in terms of capturing chromium vapors. It was found that

both in air and oxy-fuel combustion

CaO and Fe2O3 showed high reactivity with chromium vapor. Limestone exhibited lower Cr solidification effect compared to CaO and Fe2O3. Kaolin had little effect on Cr retention in solid ash both in air and oxy-fuel combustion. H2O promoted the oxidation of trivalent Cr(Ⅲ) to high valance Cr vapors such as CrO(OH)2

CrO2(OH) and CrO2(OH)2 in a short second time scale. The capability of Fe2O3 was enhanced

while the capability of CaO was inhibited by steam on capturing Cr during oxy-fuel combustion. CaO

particularly in the coexistence of H2O

remarkably enhanced the formation of toxic Cr(VI) in solid ash

up to 43% of the total Cr. The presence of H2O in flue gas promoted the retention of Cr in solid ash

which decreased again with the increase of H2O from 8% to 20% during oxy-fuel combustion

attributing to the inhibition of CaO by steam in terms of capturing Cr vapors.

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