Speed control mechanism of reaction between SO<sub>2</sub>/SO<sub>3</sub> and CaO

LIU Yong; ZHENG Chenghang; YANG Zhengda; QU Ruiyang; ZHANG Yongxin; WENG Weiguo; LIU Shaojun; GAO Xiang

doi:10.19666/j.rlfd.201802027

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Speed control mechanism of reaction between SO₂/SO₃ and CaO

更新时间：2025-09-28

- Speed control mechanism of reaction between SO₂/SO₃ and CaO
- Thermal Power Generation Vol. 47, Issue 11, Pages: 29-34(2018)
- 作者机构：
  
  浙江大学能源清洁利用国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201802027
  CLC： X701.3
- Published Online：24 October 2018，
  
  Published：2018
- 稿件说明：
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LIU Yong, ZHENG Chenghang, YANG Zhengda, et al. Speed control mechanism of reaction between SO₂/SO₃ and CaO[J]. Thermal power generation, 2018, 47(11): 29-34.
DOI：

LIU Yong, ZHENG Chenghang, YANG Zhengda, et al. Speed control mechanism of reaction between SO₂/SO₃ and CaO[J]. Thermal power generation, 2018, 47(11): 29-34. DOI： 10.19666/j.rlfd.201802027.

摘要

碱基喷射是脱除燃煤烟气中SO_3的重要方法

烟气中的SO_2也可能与碱基反应

降低碱基吸收剂对SO_3的脱除效率。为了研究不同温度下SO_2、SO_3分别与CaO的反应速率以及反应的控制机制

本文设计了耐腐蚀性气氛的吸收反应装置

建立了反应速率控制模型

计算得到了关键的反应动力学参数。研究结果表明:温度为350、400、450℃时

反应20 min内

SO_3与CaO的平均反应速率分别为SO_2的3.2倍、4.2倍和4.0倍;CaO与SO_2反应时

反应速率的控制步骤为界面反应;CaO与SO_3反应时

反应速率的控制步骤为外扩散;提出从吸收剂侧减小外扩散阻力的SO_3强化脱除方法

如磨细吸收剂

将吸收剂溶解后雾化喷射

优化流场等;另外

适当降低反应温度可以减少SO_2对吸收剂的消耗。

Abstract

Alkaline sorbent injection is an important method to remove SO_3 from coal-fired flue gas

while SO_2 in the flue gas may also react with the alkaline sorbent

which reduces the SO_3 remove efficiency of alkaline sorbent. In order to study the reaction rate and mechanism of reaction between SO_2/SO_3 and CaO at different temperatures

a corrosion-atmosphere-resistant absorption reaction device was designed and a reaction rate control model was established. The key reaction kinetic parameters were calculated. The results show that

the average reaction rates of SO_3 and CaO are 3.2 times

4.2 times and 4.0 times of that of SO_2 respectively at 350 ℃

400 ℃ and 450 ℃within 20 min. When CaO reacts with SO_2

the control step of the reaction rate is interface reaction. When CaO reacts with SO_3

the control step of the reaction rate is external diffusion. On this basis

a method is proposed to improve the removal efficiency of SO_3 by alkaline sorbent injection

namely reducing the external diffusion resistance from the sorbent side

such as fine grinding of the sorbent

atomization spraying after the sorbent is dissolved

and optimization of the flow field. In addition

decreasing the reaction temperature appropriately can reduce the consumption of sorbent by SO_2.

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Speed control mechanism of reaction between SO2/SO3 and CaO

DOI：10.19666/j.rlfd.201802027

摘要

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Speed control mechanism of reaction between SO₂/SO₃ and CaO