Product distribution and reactivity of coal pyrolysis at high temperature and in atmospheres containing O<sub>2</sub>/steam

WU Shi-sheng; ZENG Xi; REN Ming-wei; WANG Yin; XU Shao-ping; XU Guang-wen

Volume 40 Issue 06

Jun. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(06): 660-665

WU Shi-sheng, ZENG Xi, REN Ming-wei, WANG Yin, XU Shao-ping, XU Guang-wen. Product distribution and reactivity of coal pyrolysis at high temperature and in atmospheres containing O2/steam[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 660-665.

Citation:

WU Shi-sheng, ZENG Xi, REN Ming-wei, WANG Yin, XU Shao-ping, XU Guang-wen. Product distribution and reactivity of coal pyrolysis at high temperature and in atmospheres containing O₂/steam[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 660-665.

Citation:

WU Shi-sheng, ZENG Xi, REN Ming-wei, WANG Yin, XU Shao-ping, XU Guang-wen. Product distribution and reactivity of coal pyrolysis at high temperature and in atmospheres containing O₂/steam[J]. Journal of Fuel Chemistry and Technology, 2012, 40(06): 660-665.

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Product distribution and reactivity of coal pyrolysis at high temperature and in atmospheres containing O₂/steam

1.
State Key Laboratory of Fine Chemicals, Department of Chemical Engineering, Dalian University of Technology, Dalian 116012, China;
2.
State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Science, Beijing 100190, China

Received Date: 2011-09-24
Rev Recd Date: 2011-11-19
Publish Date: 2012-06-30

Abstract

Abstract

The product distribution and reactivity of coal pyrolysis at temperatures up to 850 ℃ and in atmospheres containing O₂ and steam were studied. The effects of reaction temperature, equivalent air ratio (ER) and the mass ratio of steam to coal (S/C) were examined. The gas yield increased with the increases of the temperature, ER and S/C, whereas the yields of char and tar correspondingly decreased. When O₂ was present in the atmosphere, the CO₂ and CO productions obviously increased, while that of H₂ decreased. The simultaneous presence of O₂ and steam in the atmosphere improved the specific surface area and reactivity of the resultant char. However, the gasification reactivity of char produced at 900 ℃ in N₂ and/or in an atmosphere with an ER 0.22 at 850 ℃ was low because of occurrence of carbon graphitization. The inclusion of O₂ and steam into the atmosphere had a great effect on the tar properties. Compared with pyrolysis in pure N₂, the tar produced in O₂ and steam contained fewer single-ring aromatics and phenolic, ketonic and aliphatic hydrocarbons, which made the tar more reactive for cracking and reforming.
- high temperature pyrolysis,
- steam pyrolysis,
- partial oxidation pyrolysis,
- product distribution,
- char reactivity

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References(19)

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