Influence of different biomass ash additive on anthracite pyrolysis process and char gasification reactivity  

作　　者：Xiaoming Li Caifeng Yang Mengjie Liu Jin Bai Wen Li 

机构地区：[1]School of Chemical and Biological Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,Shanxi,China [2]State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,030001,China [3]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《International Journal of Coal Science & Technology》2020年第3期464-475,共12页国际煤炭科学技术学报（英文）

基　　金：This work was financial supported by Natural Science Foundation of Shanxi Province(Grant Number 201801D12105);Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province(Grant Number 2017006);Shanxi Scholarship Council of China(Grant Number 2017-086).

摘　　要：Catalytic coal gasification technology shows prominent advantages in enhancing coal gasification reactivity and is restrained by the cost of catalyst.Two typical biomass ash additions,corn stalk ash(CSA,high K–Na and low Si)and poplar sawdust ash(PSA,high K–Ca and high Si),were employed to study the influence of biomass ash on pyrolysis process and char gasification reactivity of the typical anthracite.Microstructure characteristics of the char samples were examined by X-ray diffraction(XRD).Based on isothermal char-CO2 gasification experiments,the influence of biomass ash on reactivity of anthracite char was determined using thermogravimetric analyzer.Furthermore,structural parameters were correlated with different reactivity parameters to illustrate the crucial factor on the gasification reactivity varied with char reaction stages.The results indicate that both CSA and PSA additives hinder the growth of adjacent basic structural units in a vertical direction of the carbon structure,and then slow down the graphitization process of the anthracite during pyrolysis.The inhibition effect is more prominent with the increasing of biomass ash.In addition,the gasification reactivity of anthracite char is significantly promoted,which could be mainly attributed to the abundant active AAEM(especially K and Na)contents of biomass ash and a lower graphitization degree of mixed chars.Higher K and Na contents illustrate that the CSA has more remarkable promotion effect on char gasification reactivity than PSA,in accordance with the inhibition effect on the order degree of anthracite char.The stacking layer number could reasonably act as a rough indicator for evaluating the gasification reactivity of the char samples.

关 键 词：Biomass ash Catalytic effect PYROLYSIS Gasification reactivity Structural parameters AAEM 

分 类 号：TQ530[化学工程—煤化学工程]