CaCO_3对生活垃圾热解气体组成的影响
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摘要
利用固定床反应器,选用CaCO_3和SiO_2为添加剂,进行了生活垃圾催化热解实验研究,结果表明,CaCO_3在生活垃圾热解中的催化作用比SiO_2更加明显。为此,研究了不同CaCO_3添加量对热解可燃气产量的影响,探讨了CaCO_3在生活垃圾热解过程中的催化作用机理,重点分析了CaCO_3对生活垃圾热解气中CH_4和CO的影响机理。通过对比分析生活垃圾中添加不同量CaO的热解实验结果,得出CaCO3的催化作用主要在于其分解产物CaO促进了垃圾的二次热解,以及CO_2与C的还原反应。
Catalytic pyrolysis tests of municipal solid waste were carried out with additives of CaCO_3 and SiO_2 in a fixed bed reactor in this study. The influence of additives including CaCO_3 and SiO_2 with various amounts on the combustible gas productions was studied,and the catalytic mechanism of CaCO_3 in municipal solid waste pyrolysis was discussed. The result shows that the catalytic effect of CaCO_3 was better than that of SiO_2,and the effect of CaCO_3 on CH_4 and CO during municipal solid waste pyrolysis was analyzed in the paper. And the pyrolysis of municipal solid waste was tested with the addition of CaO which was the thermal decomposition product of CaCO_3. The catalysis of CaO mainly manifested in two aspects: Catalyst CaO promoted the evolution of secondary cracking reaction and the reduction reaction between CO_2 and C.
Catalytic pyrolysis tests of municipal solid waste were carried out with additives of CaCO_3 and SiO_2 in a fixed bed reactor in this study. The influence of additives including CaCO_3 and SiO_2 with various amounts on the combustible gas productions was studied,and the catalytic mechanism of CaCO_3 in municipal solid waste pyrolysis was discussed. The result shows that the catalytic effect of CaCO_3 was better than that of SiO_2,and the effect of CaCO_3 on CH_4 and CO during municipal solid waste pyrolysis was analyzed in the paper. And the pyrolysis of municipal solid waste was tested with the addition of CaO which was the thermal decomposition product of CaCO_3. The catalysis of CaO mainly manifested in two aspects: Catalyst CaO promoted the evolution of secondary cracking reaction and the reduction reaction between CO_2 and C.
引文
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[2]Persson K,Brostrm M,Carlsson J,et al.High temperature corrosion in a 65MW waste to energy plant[J].Fuel Processing Technology,2007,88(11/12):1178-1182.
[3]丁园,史蓉蓉,刘燕红,等.城市垃圾焚烧过程中二噁英的产生与防治[J].江西化工,2008(1):66-69.
[4]张宇,邓娜,周欣,等.城市垃圾焚烧中二恶英产生机理与控制[J].环境卫生工程,2005,13(3):37-40.
[5]江建方.城市生活垃圾外热式热解技术的研究[D].武汉:华中科技大学,2006.
[6]Yaman S.Pyrolysis of biomass to produce fuels and chemical feedstocks[J].Energy Conversion and Management,2004,45(5):651-671.
[7]Delgado J,Aznar M P,Corella J.Calcined dolomite,magnesite and calcite for cleaning hot gas from a fluidized bed biomass gasifier with steam:Life and usefulness[J].Ind Eng Chem Res,1996,35:3637-3643.
[8]Delgado J,Aznar M P.Biomass gasification with steam in fluidized bed:Effectiveness of Ca O,Mg O,and Ca O-Mg O for hot raw gas cleaning[J].Ind Eng Chem Res,1997,36:1535-1543.
[9]张郑磊,柳丹,王晋权.不同催化剂下玉米秸秆热解产物特性研究[J].锅炉技术,2008,39(6):75-78.
[10]阮娟.两种无机添加剂对生物质热解的催化作用研究[D].淮南:安徽理工大学,2011.
[11]易仁金.城市生活垃圾催化热解的实验研究[D].武汉:华中科技大学,2007.
[12]杨帆.城市生活垃圾催化热解制氢实验研究[D].武汉:华中科技大学,2008.
[13]罗思义,肖波,郭献军.城市生活垃圾水蒸气催化热解的实验研究[J].环境科学与技术,2009,32(8):43-47.