钙镁氧化物及氢氧化物脱除SO3协同防治催化剂低温失活

doi:10.16085/j.issn.1000-6613.2020-0012

摘要/Abstract

摘要：

在实验室中试台架上，开展了Ca(OH)₂、CaO、Mg(OH)₂和MgO四种碱基吸附剂粉体喷射脱除烟气SO₃的实验，研究了碱基吸附剂脱除烟气SO₃的影响因素，探究了碱基吸附剂脱除SO₃技术对选择性催化还原（SCR）催化剂硫酸氢铵失活温度的影响。采用比表面积法（BET）、傅里叶红外光谱（FTIR）等手段对吸附剂进行表征，以判断吸附产物和吸附机理。结果显示：碱基氢氧化物吸附剂的SO₃脱除效果优于碱基氧化物吸附剂；Mg基吸附剂优于Ca基吸附剂；当烟气中SO₃浓度为35μL/L时，Mg(OH)₂含量为600mg/m³时具有最高的SO₃脱除效率，达到95%左右。对低温失活后的SCR催化剂进行FTIR表征证实了催化剂表面硫酸氢铵的生成。此外，通过碱基吸附剂降低烟气中SO₃浓度后，SCR催化剂在低温时的失活得到了显著缓解，可明显降低SCR催化剂的硫酸氢铵失活温度约20℃，有助于挖掘机组调峰深度。

关键词: 烟道气, 超低排放, 选择性催化还原, 硫酸氢铵, 三氧化硫, 吸附剂, 化学计量比

Abstract:

The experiments of SO₃ removal from flue gas by spraying Ca(OH)₂, CaO, Mg(OH)₂ and MgO based sorbent powders were carried out on a pilot reactor. The effect of SO₃ removal by the base adsorbents on the SCR catalyst ammonium bisulfate deactivation temperature was investigated. The adsorbents were characterized by BET and FTIR to determine the adsorption products and the adsorption mechanism. The results indicated that the SO₃ removal efficiency of the alkaline based hydroxides was higher than that of the alkaline based oxides, and the Mg based adsorbent was better than the Ca based adsorbent. When the concentration of SO₃ in flue gas was 35μL/L and the content of Mg(OH)₂ was 600mg/m³, the highest SO₃ removal efficiency of 95% was achieved. The formation of ammonium bisulfate on the surface of the SCR catalyst was confirmed by FTIR. In addition, the reduction of SO₃ concentration in flue gas can reduce the deactivation temperature of the ammonium bisulfate SCR catalyst by about 20℃, and hence the deactivation of the SCR catalyst at low temperature had been significantly alleviated, which could help to expand the peak regulation space of the coal-fired unit.

Key words: flue gas, ultra low emission, SCR, ammonium bisulfate, SO₃, adsorbents, stoichiometric ratio

中图分类号:

X511

何川, 宋玉宝, 马云龙, 王乐乐, 卞子君. 钙镁氧化物及氢氧化物脱除SO₃协同防治催化剂低温失活[J]. 化工进展, 2020, 39(11): 4619-4624.

Chuan HE, Yubao SONG, Yunlong MA, Lele WANG, Zijun BIAN. Synergetic control catalyst deactivation at low temperature through SO₃ removal by calcium magnesium oxide and hydroxide[J]. Chemical Industry and Engineering Progress, 2020, 39(11): 4619-4624.

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钙镁氧化物及氢氧化物脱除SO₃协同防治催化剂低温失活

Synergetic control catalyst deactivation at low temperature through SO₃ removal by calcium magnesium oxide and hydroxide

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