Variation of toxic pollutants emission during a feeding cycle from an updraft fixed bed gasifier for disposing rural solid waste  

作　　者：Ming Lei Jing Hai Jiang Cheng Jiawei Lu Jieru Zhang Tao You 

机构地区：[1]School of Chemistry and Chemical Engineering, South China University of Technology [2]South China Institute of Environmental Sciences, Ministry of Environmental Protection (MEP)

出　　处：《Chinese Journal of Chemical Engineering》2018年第3期608-613,共6页中国化学工程学报（英文版）

基　　金：Supported by the Science and Technology Planning Project of Guangdong Province,China(2013B090600134);the National Natural Science Foundation of China(51608223);the Fund for Basic Scientific Research Business of Central Institutes of Environmental Protection(PM-zx 703-201602-050)

摘　　要：The variation of toxic pollutants emission during a feeding cycle was examined by field monitoring from a batch feeding updraft fixed bed gasifier for disposing rural domestic solid waste. Results showed that the content of oxygen in flue gas gradually increased, while SO_2 and HCl in flue gas decreased with time after feeding in a whole feeding cycle. Although large amount of CO was produced during the gasifying, low CO content in flue gas could be obtained after the heat treatment with an electric heating device. The distribution characteristics of dioxin congeners in flue gas indicted the re-synthesis of dioxins after flue gas heating, and the increase of oxygen promoted the synthesis of dioxins. The emission content of dioxins could meet the standard(0.1 ng I-TEQ·m^(-3),GB18458-2014) of China when the oxygen content was controlled below 8.3%. Hence, for a batch feeding gasifier,low oxygen condition should be offered by reducing air intake at the later stage of feeding cycle in order to decrease the re-synthesis of dioxins after the flue gas heating.The variation of toxic pollutants emission during a feeding cycle was examined by field monitoring from a batch feeding updraft fixed bed gasifier for disposing rural domestic solid waste. Results showed that the content of oxygen in flue gas gradually increased, while SO2 and HCl in flue gas decreased with time after feeding in a whole feeding cycle. Although large amount of CO was produced during the gasifying, low CO content in flue gas could be obtained after the heat treatment with an electric heating device. The distribution characteristics of dioxin congeners in flue gas indicted the re-synthesis of dioxins after flue gas heating, and the increase of oxygen promoted the synthesis of dioxins. The emission content of dioxins could meet the standard （0.1 ng I-TEQ·m^-3, GB18458-2014） of China when the oxygen content was controlled below 8.3%. Hence, for a batch feeding gasifier, low oxygen condition should be offered by reducing air intake at the later stage of feeding cycle in order to decrease the re-synthesis of dioxins after the flue gas heating.

关 键 词：Updraft fixed bed gasifier Solid waste Pollutants Dioxins Emission Variation 

分 类 号：X799.1[环境科学与工程—环境工程]