Charcoal Production via Multistage Pyrolysis

›› 2012, Vol. 20 ›› Issue (3): 455-460.

• 香港科技大学化学与生物分子工程系戈登·麦凯教授退休纪念专刊 • 上一篇下一篇

Charcoal Production via Multistage Pyrolysis

Adetoyese Olajire Oyedun, Ka Leung Lam, Chi Wai Hui

Department of Chemical and Biomolecular Engineering, the Hong Kong University of Science and Technology, Hong Kong, China

收稿日期:2012-02-06 修回日期:2012-04-26 出版日期:2012-06-28 发布日期:2012-08-17
通讯作者: Chi Wai Hui, E-mail: kehui@ust.hk
基金资助:
Supported by the Hong Kong RGC in form of PhD Fellowship to Adetoyese Olajire Oyedun(PF09-05997)

Charcoal Production via Multistage Pyrolysis

Adetoyese Olajire Oyedun, Ka Leung Lam, Chi Wai Hui

Department of Chemical and Biomolecular Engineering, the Hong Kong University of Science and Technology, Hong Kong, China

Received:2012-02-06 Revised:2012-04-26 Online:2012-06-28 Published:2012-08-17
Supported by:
Supported by the Hong Kong RGC in form of PhD Fellowship to Adetoyese Olajire Oyedun(PF09-05997)

摘要/Abstract

摘要： Interests in charcoal usage have recently been re-ignited because it is believed that charcoal is a much better fuel than wood.The conventional charcoal production consumes a large amount of energy due to the prolonged heating time and cooling time which contribute to the process completing in one to several days.Wood pyrolysis consists of both endothermic and exothermic reactions as well as the decomposition of the different components at different temperature range(hemicellulose:200-260℃;cellulose:240-350℃ and lignin:280-500℃).In this study we propose a multistage pyrolysis which is an approach to carry out pyrolysis with multiple heating stages so as to gain certain processing benefits.We propose a three-stage approach which includes rapid stepwise heating stage to a variable target temperatures of 250℃,300℃,350℃ and 400℃,slow and gradual heating stage to a final temperature of 400℃ and adiabatic with cooling stage.The multi-stage pyrolysis process can save 30% energy and the processing time by using a first temperature target of 300℃ and heating rate of 5℃·min^-1 to produce a fixed-carbon yield of 25.73% as opposed to the base case with a fixed-carbon yield of 23.18%.

关键词: wood pyrolysis, charcoal production, multistage heating

Abstract: Interests in charcoal usage have recently been re-ignited because it is believed that charcoal is a much better fuel than wood.The conventional charcoal production consumes a large amount of energy due to the prolonged heating time and cooling time which contribute to the process completing in one to several days.Wood pyrolysis consists of both endothermic and exothermic reactions as well as the decomposition of the different components at different temperature range(hemicellulose:200-260℃;cellulose:240-350℃ and lignin:280-500℃).In this study we propose a multistage pyrolysis which is an approach to carry out pyrolysis with multiple heating stages so as to gain certain processing benefits.We propose a three-stage approach which includes rapid stepwise heating stage to a variable target temperatures of 250℃,300℃,350℃ and 400℃,slow and gradual heating stage to a final temperature of 400℃ and adiabatic with cooling stage.The multi-stage pyrolysis process can save 30% energy and the processing time by using a first temperature target of 300℃ and heating rate of 5℃·min^-1 to produce a fixed-carbon yield of 25.73% as opposed to the base case with a fixed-carbon yield of 23.18%.

Key words: wood pyrolysis, charcoal production, multistage heating

Adetoyese Olajire Oyedun, Ka Leung Lam, Chi Wai Hui. Charcoal Production via Multistage Pyrolysis[J]. , 2012, 20(3): 455-460.

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Charcoal Production via Multistage Pyrolysis

Charcoal Production via Multistage Pyrolysis

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