Chemical-looping combustion of solid fuels in a 10 kWth pilot - batch tests with five fuels

被引:28
作者
Linderholm, Carl [1 ]
Cuadrat, Ana [2 ]
Lyngfelt, Anders [1 ]
机构
[1] Chalmers, Environm & Energy Dept, S-41296 Gothenburg, Sweden
[2] CSIC, Inst Carboquim, Dept Energy & Environm, Zaragoza 50018, Spain
来源
10TH INTERNATIONAL CONFERENCE ON GREENHOUSE GAS CONTROL TECHNOLOGIES | 2011年 / 4卷
关键词
chemical-looping combustion; CO2; capture; fluidized bed; oxygen carrier; solid fuels; reaction rate constant; oxygen demand; OXYGEN CARRIER; OPERATION; TEMPERATURE; PARTICLES; ILMENITE; COAL;
D O I
10.1016/j.egypro.2011.01.066
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
Chemical-looping combustion (CLC) is a combustion concept with inherent separation of CO2. The process uses a solid oxygen carrier, which consists of metal oxide, to transfer the oxygen from air to fuel. This paper presents findings from batch tests performed in a 10 kW(th) CLC pilot for solid fuels. The pilot, which is the world's first chemical-looping combustor for solid fuels, is based on interconnected fluidized-bed technology and features a fuel reactor (FR) and an air reactor (AR) as the principal reaction chambers. In the FR, fuel is gasified with steam whereupon gasification products react with the oxygen carrier to form, ideally, CO2, H2O and SO2. Oxygen-carrier particles exit the FR through a weir and are led to the AR, where they are regenerated to their oxidized state. The pilot has been operated using a natural iron-titanium ore called ilmenite as oxygen carrier. Previous continuous tests have demonstrated a need for batch tests in order to obtain complementary information on system performance. In this study, five fuels were fed to the fuel reactor in batches of 20-25 g at four temperatures; 940 degrees C, 970 degrees C, 1000 degrees C and 1030 degrees C. By using devolatilized fuel, it was possible to determine (a) oxygen demand associated with syngas from char gasification as well as (b) kinetics of char conversion to gas. Rates of char conversion were found to be temperature dependent, as expected, whereas no temperature dependence was found for the oxygen demand. Activation energies for conversion of char to gas were calculated using Arrhenius plots. The minimum oxygen demand for char was found to be around 5%. (C) 2010 Elsevier Ltd. All rights reserved
引用
收藏
页码:385 / 392
页数:8
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