Physicochemical structure characteristics and intrinsic reactivity of demineralized coal char rapidly pyrolyzed at elevated pressure

2020 ◽  
Vol 93 (3) ◽  
pp. 1064-1073 ◽  
Author(s):  
Dan Lin ◽  
Li Liu ◽  
Yi-Jun Zhao ◽  
Yan Zhao ◽  
Peng-Hua Qiu ◽  
...  
Keyword(s):  
Elevated Pressure ◽  
Coal Char ◽  
Structure Characteristics ◽  
Intrinsic Reactivity ◽  
Physicochemical Structure

Pore Structure of Coal-Chars Derived From Atmospheric and Pressurized Spouted Fluidized Bed Gasifiers

2005 ◽  
Author(s):  
Yufeng Duan ◽  
Yi Zhou ◽  
Xiaoping Chen ◽  
Changsui Zhao ◽  
Xin Wu
Keyword(s):  
Pore Structure ◽  
Fluidized Bed ◽  
Positive Impact ◽  
Elevated Pressure ◽  
Influential Factors ◽  
Coal Char ◽  
Operational Conditions ◽  
Gasification Process ◽  
Leading Role ◽  
Partial Gasification

Pore structure is one of the most important factors that dominate the reactivity of post-combustion of coal-chars derived from partial gasification process of atmospheric and pressurized spouted fluidized bed gasifiers. The influential factors on pore structure of coal-chars were analyzed in terms of the coal size feed, operational conditions, coal-char size and its components. It concluded that pyrolysis and devolatilization play a leading role in forming the pore structure of coal-chars in the partial gasification process. It is the reaction of coal-char with CO2 and H2O (steam) that plays a dominant positive impact on promoting enlargement and development of the coal-char pores at the elevated pressure gasification. There may exist an optimal coal-char size range that possesses abundant porosity and bigger pore specific surface area, which contributes to enhancing the gasification reactions in the atmospheric gasifier.

The intrinsic reactivity of coal char conversion compared under different conditions of O2/CO2, O2/H2O and air atmospheres

2020 ◽  
Vol 93 (5) ◽  
pp. 1883-1891
Author(s):  
Yang Liu ◽  
Peifang Fu ◽  
Kang Bie ◽  
Yusen Gong ◽  
Tianyao Xu
Keyword(s):  
Coal Char ◽  
Intrinsic Reactivity ◽  
Char Conversion
Sign in / Sign up

Export Citation Format

Share Document