常温条件下O2和NO2对Ca(OH)2吸附SO2产物的影响

许亚伟; 王志鹏; 李鹏飞; 韩永强; 李清海; 佟会玲

doi:10.13205/j.hjgc.202011019

常温条件下O₂和NO₂对Ca(OH)₂吸附SO₂产物的影响

doi: 10.13205/j.hjgc.202011019

1. 清华大学能源与动力工程系, 北京 100084;
2. 中冶节能环保有限责任公司, 北京 100088

基金项目:

二氧化碳固体吸附工艺优化和方案设计（2017YFB0603304-2）。

详细信息

作者简介:
许亚伟(1993-),男,硕士,主要研究方向为钙基常温同时脱硫脱硝。xyw15@mails.tsinghua.edu.cn

通讯作者:
佟会玲(1968-),女,博士,副教授,主要研究方向为常温同时脱硫脱硝。tonghl@mail.tsinghua.edu.cn

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- 文章访问数: 89
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出版历程
- 收稿日期: 2020-02-17
- 网络出版日期: 2021-04-23
- 刊出日期: 2021-04-23

INFLUENCE OF O₂ AND NO₂ ON ADSORPTION PRODUCTS OF SO₂ BY Ca(OH)₂ AT LOW TEMPERATURE

1. Energy and Power Engineering, Tsinghua University, Beijing 100084, China;
2. Energy-Saving&Environmental Protection Co., Ltd, MCC Group, Beijing 100088, China

摘要

摘要: 在100℃的无水蒸气条件下研究以Ca（OH）₂为吸收剂同时脱硫脱硝过程中SO₂的固定和氧化过程，以及O₂和NO₂的作用。分别用原位漫反射傅里叶红外光谱和固定床反应器，研究过程中Ca（OH）₂表面和气相的成分变化。结果表明：SO₂吸附在Ca（OH）₂表面形成的CaSO₃不易被O₂氧化，但可以被NO₂氧化。同时脱除过程中，NO₂对CaSO₃的氧化具有选择性：930~936 cm^-1位置的红外吸收峰在反应过程中先升高后降低，980~995 cm^-1位置的红外吸收峰只升高不降低。无O₂条件下，参与反应的NO₂以接近1∶1的比例转化为NO，而有O₂条件下Ca（OH）₂同时脱除NO₂和SO₂时，Ca（NO₃）₂的含量明显增加，且反应前期CaSO₄的生成速率加快。
- 同时脱硫脱硝 /
- CaSO₃氧化 /
- 气固反应 /
- 原位漫反射红外光谱分析 /
- 固定床实验
Abstract: In order to analyze the fixation and oxidation reaction of SO₂ in simultaneous removal of SO₂ and NO_x by Ca(OH)₂, and the influence of O₂ and NO₂ on this progress, DRIFTS(diffuse reflectance infrared Fourier transform spectrometry) and fixed bed reactor were used respectively for composition changes of solid and gas phase at 100 ℃ and 0% RH. The results showed that firstly SO₂ was rapidly adsorbed on Ca(OH)₂ to form CaSO₃, which could hardly be oxidized by O₂, but could be oxidized to CaSO₄ by NO₂. CaSO₃ showed selectivity during simultaneous removal process, of which the infrared absorption peak at the position of 930~936 cm^-1 first increased and then decreased, while the peak at 980~995 cm^-1 monotonically increased.When SO₂ and O₂ coexisted in the gas, it could react with Ca(OH)₂ to form CaSO₄. When NO₂ and SO₂ were simultaneously removed by Ca(OH)₂ in the absence of O₂, the ratio of produced NO/consumed NO₂ was around 1:1, but in the presence of O₂, the content of Ca(NO₃)₂ increased significantly, and the formation rate of CaSO₄ was accelarated in the early stage of reation.
- simultaneous desulfurization and denitration /
- CaSO₃ oxidation /
- gas-solid reaction /
- DRIFT /
- fixed bed experiment

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