Citation: GUO Pei, ZHAO Hui-ming, JIA Ting-hao, WANG Mei-jun, CHANG Li-ping. Effect of co-pyrolysis process on the oxidation reactivity of lignite char and biomass char[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(10): 1188-1194. shu

Effect of co-pyrolysis process on the oxidation reactivity of lignite char and biomass char

1.
Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Ministry of Education and Shanxi Province, Taiyuan 030024, China

Corresponding author: CHANG Li-ping,
Received Date: 11 February 2015
Available Online: 20 May 2015
Fund Project: 国家自然科学基金项目(21176165,U1261110) (21176165,U1261110)国家自然科学青年基金项目(21406152) (21406152)山西省省回国留学基金项目(2014-028) (2014-028)太原理工大学引进人才基金项目(tyut-rc201366a) (tyut-rc201366a)太原理工大学青年基金(2013Z024)资助项目 (2013Z024)

Ximeng lignite and cornstalk were used as the feedstock to prepare lignite char, biomass char and co-pyrolysis char with different blending ratios in a fixed bed reactor with temperature-programmed pyrolysis. The pore and chemical structure of char samples were characterized and the ash composition was analyzed. The oxidation reactivity of the mixtures of lignite char/cornstalk char with different blending ratios and the co-pyrolysis char of lignite and cornstalk with corresponding blending ratios were investigated by the isothermal thermogravimetry at 450 ℃, aimed at the effect of co-pyrolysis process on the char reactivity. The results show that there are obvious influences on the char structures through secondary reactions during co-pyrolysis process, leading to the char reactivity decrease. Especially with the cornstalk proportion less than 50%, these influences are more significant due to a large number of volatiles from cornstalk during co-pyrolysis enhancing the secondary reactions between the volatile and nascent char, prompting parts of organic structure less than 5 rings turn into the larger organic structure. For the char samples with cornstalk proportion above 50%, the catalytic effect of alkaline and alkaline earth metal in biomass char plays a dominating role, especially the effect of potassium, resulting in the weaker effects of secondary reactions on the structure and oxidation reactivity of the char samples.
- lignite,
- biomass,
- co-pyrolysis,
- oxidation reactivity
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