SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (7): 1214-1224.DOI: 10.1016/j.cjche.2014.11.032

• 能源、资源与环境技术 • 上一篇    下一篇

Comparison of steam-gasification characteristics of coal char and petroleum coke char in drop tube furnace

Lu Ding, Zhijie Zhou, Wei Huo, Guangsuo Yu   

  1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology (ECUST), Shanghai 200237, China
  • 收稿日期:2014-08-21 修回日期:2014-11-18 出版日期:2015-07-28 发布日期:2015-08-21
  • 通讯作者: Zhijie Zhou, Guangsuo Yu
  • 基金资助:

    Supported by the National High Technology Research and Development of China (2012AA053101, 2011AA050106), the National Key State Basic Research Development Program of China (2010CB227004) and the National Natural Science Foundation of China (21376081).

Comparison of steam-gasification characteristics of coal char and petroleum coke char in drop tube furnace

Lu Ding, Zhijie Zhou, Wei Huo, Guangsuo Yu   

  1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology (ECUST), Shanghai 200237, China
  • Received:2014-08-21 Revised:2014-11-18 Online:2015-07-28 Published:2015-08-21
  • Contact: Zhijie Zhou, Guangsuo Yu
  • Supported by:

    Supported by the National High Technology Research and Development of China (2012AA053101, 2011AA050106), the National Key State Basic Research Development Program of China (2010CB227004) and the National Natural Science Foundation of China (21376081).

摘要: The steam-gasification reaction characteristics of coal and petroleumcoke (PC)were studied in the drop tube furnace (DTF). The effects of various factors such as types of carbonaceous material, gasification temperature (1100-1400 ℃) and mass ratio of steam to char (0.4:1, 0.6:1 and 1:1 separately) on gasification gas or solid products were investigated. The results showed that for all carbonaceous materials studied, H2 content exhibited the largest part of gasification gaseous products and CH4 had the smallest part. For the two petroleum cokes, CO2 content was higher than CO, which was similar to Zun-yi char.When the steam/char ratio was constant, the carbon conversion of both Shen-fu and PC chars increased with increasing temperature. When the gasification temperature was constant, the carbon conversions of all char samples increased with increasing steam/char ratio. For all the steam/char ratios, compared to water gas shift reaction, char-H2O and char-CO2 reaction were further from the thermodynamic equilibrium due to a much lower char gasification rate than that of water gas shift reaction rate. Therefore, kinetic effects may play a more important role in a char gasification step than thermodynamic effects when the gasification reaction of char was held in DTF. The calculating method for the equilibrium shift in this studywill be aworth reference for analysis of the gaseous components in industrial gasifier. The reactivity of residual cokes decreased and the crystal layer (L002/d002) numbers of residual cokes increased with increasing gasification temperature. Therefore, L002/d002, the carbon crystallite structure parameter, can be used to evaluate the reactivity of residual cokes.

关键词: Drop tube furnace, Steam/char ratio, Thermodynamic equilibrium, Reactivity

Abstract: The steam-gasification reaction characteristics of coal and petroleumcoke (PC)were studied in the drop tube furnace (DTF). The effects of various factors such as types of carbonaceous material, gasification temperature (1100-1400 ℃) and mass ratio of steam to char (0.4:1, 0.6:1 and 1:1 separately) on gasification gas or solid products were investigated. The results showed that for all carbonaceous materials studied, H2 content exhibited the largest part of gasification gaseous products and CH4 had the smallest part. For the two petroleum cokes, CO2 content was higher than CO, which was similar to Zun-yi char.When the steam/char ratio was constant, the carbon conversion of both Shen-fu and PC chars increased with increasing temperature. When the gasification temperature was constant, the carbon conversions of all char samples increased with increasing steam/char ratio. For all the steam/char ratios, compared to water gas shift reaction, char-H2O and char-CO2 reaction were further from the thermodynamic equilibrium due to a much lower char gasification rate than that of water gas shift reaction rate. Therefore, kinetic effects may play a more important role in a char gasification step than thermodynamic effects when the gasification reaction of char was held in DTF. The calculating method for the equilibrium shift in this studywill be aworth reference for analysis of the gaseous components in industrial gasifier. The reactivity of residual cokes decreased and the crystal layer (L002/d002) numbers of residual cokes increased with increasing gasification temperature. Therefore, L002/d002, the carbon crystallite structure parameter, can be used to evaluate the reactivity of residual cokes.

Key words: Drop tube furnace, Steam/char ratio, Thermodynamic equilibrium, Reactivity