Laboratory study on high-temperature adsorption of HCl by dry-injection of Ca(OH)2 in a dual-layer granular bed filter

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• 作者：Junjun Tan (1)
  Guohua Yang (2)
  Jingqiao Mao (1)
  Huichao Dai (1)
  
• 关键词：acid gas HCl ; Ca(OH)2 ; dry adsorption ; high temperature ; dual ; layer granular bed filter
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：8
• 期：6
• 页码：863-870
• 全文大小：627 KB
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• 作者单位：Junjun Tan (1)
  Guohua Yang (2)
  Jingqiao Mao (1)
  Huichao Dai (1)
  
  1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China
  2. Maritime College, Ningbo University, Ningbo, 315211, China
  
• ISSN：2095-221X

文摘

Combustion-generated hydrogen chloride (HCl) is considered to be a very hazardous acid gaseous pollutant. This paper presents a laboratory study on the dry adsorption of HCl. The experiments were conducted in a dual-layer granular bed filter, at gas temperatures of 500°C-00°C and n(Ca)/n(Cl)molar ratios of 1.0-.0 using the silver nitrate titration method by dry adsorbent powders Ca(OH)2. Mainly, the adsorption efficiency of HCl and utilization efficiency of Calcium were studied, by varying relevant factors including n(Ca)/n(Cl), temperature, feeding method, water vapor and CO2. With a relatively higher HCl concentration of 1000 ppm, the experimental results revealed that 600°C may be the optimum temperature for HCl adsorption when optimum n (Ca)/n(Cl) was 2.5 in our tests. The results also demonstrated that the feeding at a constant pressure was more effective, and the HCl adsorption efficiency could rapidly reach over 90% with n(Ca)/n(Cl) = 2.5 at 600°C. Furthermore, the HCl adsorption efficiency was found to be slightly promoted by water vapor, while could be impeded by CO2, and the utilization efficiency of calcium could be up to 74.4% without CO2, while was only 36.8% with CO2 when n(Ca)/n(Cl) was 2.5 at 600°C.