Desulfurization experiment analysis based on control of multiple pollutants in flue gas at medium temperature

doi:10.16085/j.issn.1000-6613.2018-1152

Abstract

Abstract: NO_x, SO₂ and dust can be removed by the Flue gas integrated removal method at medium temperature(200-400℃), which owns development prospects with the increasingly severe environmental problems. As a potential desulfurizing agent for this method, calcium hydroxide has less experimental study on the removal of SO₂ at medium temperature. In view of this situation, the effect of different factors on the desulfurization efficiency is experimented in self-made experimental system. It was shown that the presence of water vaper and NO_x caused the inhibition on the removal of SO₂, while the increase of the elevated temperatures promoted it. The mechanism of chemical adsorption was verified by the XRD, SEM and TG. The calcium hydroxide will be decomposed gradually in the temperature range to form the oxide, which promoted the adsorption and diffusion of SO₂, and made the desulfurization effect improve. The results of the study are the basis for further improving the desulfurization effect、enhancing the activity of the calcium hydroxide and realizing the integrated removal of flue gas pollutants at medium temperature.

Key words: flue gas desulfurization, medium temperature, Ca(OH)₂ adsorption, experiment study, integrated removal of flue gas pollutan

摘要： 中温（200～400℃）烟气多污染物一体化脱除方法能够实现烟尘、NO_x、SO₂一体化脱除，在当前环境问题日趋严峻的背景下具有一定的发展前景。氢氧化钙作为该方法的一种潜力脱硫剂，在中温条件下进行烟气中SO₂脱除的实验研究较少，针对该情况，在自制实验系统上探究了不同因素对SO₂脱除效果的影响，研究表明，在实验室自制的固定床实验系统下，烟气成分中水蒸气、CO₂、NO_x、O₂等的存在会对脱硫产生抑制，升高温度对SO₂脱除有一定促进作用。对吸附产物进行了XRD、SEM等表征，验证了化学吸附机理，氢氧化钙在该温度区间会逐渐分解形成氧化钙，促进SO₂的吸附与内扩散，使得脱硫效果提高。研究结果为进一步提高脱硫效果，提高氢氧化钙活性，并为下一步实现中温下烟气多污染物一体化脱除奠定基础。

关键词: 烟气脱硫, 中温条件, 氢氧化钙吸附, 实验研究, 污染物一体化脱除

CLC Number:

X701.3

MA Shuangchen, BIE Xuan, HUANG Xing, SUN Yao, CHEN Kuixu, ZHU Zhaoping. Desulfurization experiment analysis based on control of multiple pollutants in flue gas at medium temperature[J]. Chemical Industry and Engineering Progress, 2018, 37(S1): 205-212.

马双忱, 别璇, 黄星, 孙尧, 陈奎续, 朱召平. 基于中温烟气多污染物控制的烟气脱硫实验[J]. 化工进展, 2018, 37(S1): 205-212.

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