Desulfurization behavior of zinc oxide based sorbent modified by the combination of Al2O3 and K2CO3

被引:56
作者
Ju Shangguan [1 ]
Zhao, Yousheng [1 ]
Fan, Huiling [1 ]
Liang, Litong [1 ]
Shen, Fang [1 ]
Miao, Maoqian [1 ]
机构
[1] Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ, Taiyuan 030024, Shanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Desulfurization; Zinc oxide sorbent; Modification; Hydrogen sulfide removal; Carbonyl sulfide formation; HIGH-TEMPERATURE DESULFURIZATION; HOT COAL-GAS; H2S REMOVAL; FUEL-CELL; IGCC; ZNO; REACTIVITY; TITANATE; CYCLE;
D O I
10.1016/j.fuel.2011.04.011
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
In order to reduce the unfavorable effect of carbon oxide on desulfurization efficiency for zinc oxide based sorbent and decrease the concentration of carbonyl sulfide in effluent gas during desulfurization process, the modification of zinc oxide based sorbent is necessary in the preparation of zinc oxide based desulfurization sorbent. In this paper, the modified ZnO based desulfurization sorbents were obtained by mixing of active zinc oxide with different additives, which include graphite, Al2O3 and K2CO3, then shaping at ambient temperature, drying at 120 degrees C and calcinating at 550 degrees C. The desulfurization performances for the prepared ZnO based desulfurization sorbents were tested in a quartz upflow fixed-bed reactor under the condition of 300 degrees C, 2000 h(-1) and simulated coal-derived gas. The phases of sorbents before and after desulfurization were characterized by X-ray diffractometer, and their pore structures were measured by N-2 adsorption-desorption method. The experimental results show that COS was present in effluent gas for ZnO based sorbent while removing H2S from simulated coal-derived gas at experimental condition. ZnO based desulfurization sorbent modified by the combination of K2CO3 and Al2O3 achieves obvious improvements in the desulfurization performance, and H2S and COS concentrations in exit gas are below 0.1 mgS/m(3) before breakthrough point as well as the accumulated breakthrough sulfur capacity reaches 14 wt.%. Adding Al2O3 can improve the pore structure of ZnO based desulfurization sorbent, which benefits H2S to diffuse in the pore of sorbent and improves desulfurization performance. Loading K2CO3 can increase the basicity of ZnO based desulfurization sorbent, which raises the COS catalytic hydrolysis rate on sorbent and decreases concentration of COS present in exit gas. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:80 / 84
页数:5
相关论文
共 25 条
[1]   A regenerable copper-based sorbent for H2S removal from coal gases [J].
Abbasian, J ;
Slimane, RB .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1998, 37 (07) :2775-2782
[2]   A regenerable calcium-based core-in-shell sorbent for desulfurizing hot coal gas [J].
Akiti, TT ;
Constant, KP ;
Doraiswamy, LK ;
Wheelock, TD .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2002, 41 (03) :587-597
[3]   Characterization of Mn and Cu oxides as regenerable sorbents for hot coal gas desulfurization [J].
Alonso, L ;
Palacios, JM ;
García, E ;
Moliner, R .
FUEL PROCESSING TECHNOLOGY, 2000, 62 (01) :31-44
[4]   REMOVAL OF H2S FROM FUEL GASES AT HIGH-TEMPERATURES USING MNO/GAMMA-AL2O3 [J].
ATAKUL, H ;
WAKKER, JP ;
GERRITSEN, AW ;
VANDENBERG, PJ .
FUEL, 1995, 74 (02) :187-191
[5]   CHARACTERIZATION AND LONG-RANGE REACTIVITY OF ZINC FERRITE IN HIGH-TEMPERATURE DESULFURIZATION PROCESSES [J].
AYALA, RE ;
MARSH, DW .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1991, 30 (01) :55-60
[6]   Efficiency of an Integrated Gasification Combined Cycle (IGCC) power plant including CO2 removal [J].
Descamps, C. ;
Bouallou, C. ;
Kanniche, M. .
ENERGY, 2008, 33 (06) :874-881
[7]  
FLYTZANISTEPHAN.M, 1985, DOEMC204171989
[8]  
Haupt G, 2003, GREENHOUSE GAS CONTROL TECHNOLOGIES, VOLS I AND II, PROCEEDINGS, P1063
[9]  
[黄戒介 Huang Jiejie], 2005, [燃料化学学报, Journal of Fuel Chemistry and Technology], V33, P146
[10]   A study of Zn-Ti-based H2S removal sorbents promoted with cobalt oxides [J].
Jun, HK ;
Lee, TJ ;
Ryu, SO ;
Kim, JC .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2001, 40 (16) :3547-3556