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

doi:10.1016/j.cjche.2017.07.019

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (3): 608-613.DOI: 10.1016/j.cjche.2017.07.019

• Energy, Resources and Environmental Technology • Previous Articles Next Articles

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

Ming Lei¹, Jing Hai², Jiang Cheng¹, Jiawei Lu², Jieru Zhang², Tao You²

1 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
2 South China Institute of Environmental Sciences, Ministry of Environmental Protection(MEP), Guangzhou 510655, China

Received:2017-04-16 Revised:2017-07-24 Online:2018-04-18 Published:2018-03-28
Contact: Jing Hai, Jiang Cheng
Supported by:
Supported by the Science and Technology Planning Project of Guangdong Province, China (2013B090600134), the National Natural Science Foundation of China (51608223) and the Fund for Basic Scientific Research Business of Central Institutes of Environmental Protection (PM-zx 703-201602-050).

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

Ming Lei¹, Jing Hai², Jiang Cheng¹, Jiawei Lu², Jieru Zhang², Tao You²

1 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
2 South China Institute of Environmental Sciences, Ministry of Environmental Protection(MEP), Guangzhou 510655, China

通讯作者: Jing Hai, Jiang Cheng
基金资助:
Supported by the Science and Technology Planning Project of Guangdong Province, China (2013B090600134), the National Natural Science Foundation of China (51608223) and the Fund for Basic Scientific Research Business of Central Institutes of Environmental Protection (PM-zx 703-201602-050).

Abstract

Abstract: 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.

Key words: Updraft fixed bed gasifier, Solid waste, Pollutants, Dioxins, Emission, Variation

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 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

Ming Lei, Jing Hai, Jiang Cheng, Jiawei Lu, Jieru Zhang, Tao You. Variation of toxic pollutants emission during a feeding cycle from an updraft fixed bed gasifier for disposing rural solid waste[J]. Chin.J.Chem.Eng., 2018, 26(3): 608-613.

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

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

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