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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2014, Vol. 8 Issue (6) : 863-870    https://doi.org/10.1007/s11783-013-0618-9
RESEARCH ARTICLE
Laboratory study on high-temperature adsorption of HCl by dry-injection of Ca(OH)2 in a dual-layer granular bed filter
Junjun TAN1,Guohua YANG2,*(),Jingqiao MAO1,Huichao DAI1
1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2. Maritime College, Ningbo University, Ningbo 315211, China
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Abstract

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–700°C and n(Ca)/n(Cl)molar ratios of 1.0–5.0 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.

Keywords acid gas HCl      Ca(OH)2      dry adsorption      high temperature      dual-layer granular bed filter     
Corresponding Author(s): Guohua YANG   
Online First Date: 03 January 2014    Issue Date: 17 November 2014
 Cite this article:   
Junjun TAN,Guohua YANG,Jingqiao MAO, et al. Laboratory study on high-temperature adsorption of HCl by dry-injection of Ca(OH)2 in a dual-layer granular bed filter[J]. Front. Environ. Sci. Eng., 2014, 8(6): 863-870.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0618-9
https://academic.hep.com.cn/fese/EN/Y2014/V8/I6/863
Fig.1  Schematic diagram of experimental equipment

1: dual-layer granular bed filter; 2: small-scale fluidized bed; 3: electrically heated tube furnace; 4: temperature controller; 5: thermocouple; 6: counter flow gas inlet; 7: counter flow gas outlet; 8: quartz sand; 9: expanded perlite; 10: alumina balls; 11: adsorbent feeder; 12: asbestos insulating tube; 13: ice-cooled condenser; 14: HCl concentration analytical equipment; 15: NaOH solution; 16: quartz sand overflow pipe; 17: HCl; 18:N2; 19:O2; 20:CO2; 21: mixing humidifier; 22: reducing valve 23: calibrated rotameter 24: control valve

Fig.2  HCl adsorption efficiency with n(Ca)/n(Cl) = 1.0–5.0 at 500°C–700°C: (a–c) the demonstration for the effects of different n(Ca)/n(Cl) molar ratios; (d–f) the demonstration for the effects of different temperatures
Fig.3  (a) Pressure drop, and (b) HCl adsorption efficiency, using modified feeding with n(Ca)/n(Cl) = 2.5, 5.0 at 600°C, and (c) comparison of the HCl adsorption efficiency between the modified feeding and the general feeding
Fig.4  HCl adsorption efficiency on water vapor with n(Ca)/n(Cl) = 2.5 at 600°C
Fig.5  HCl adsorption efficiency on n(Ca)/n(Cl) = 1.0, 2.5, 5.0 at 600°C without CO2
Fig.6  The breakthrough curves of dual-layer granular bed filter for adsorbing HCl by Ca(OH)2 on n(Ca)/n(Cl) = 2.5 at 600°C: (a) with 10% CO2; (b) without CO2
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