麦秸半焦低温催化气化实验研究

doi:10.3969/j.issn.0253-2417.2015.01.018

Abstract

Abstract: The steam gasification of wheat straw char (WSC) and pickling wheat straw char (PWSC) at 700 ℃ were carried out. The effects of alkali metal content in wheat straw (WS) ash and catalyst species (K-based, Ca-based and Fe-based) on the gasification process were investigated. The results show that high content of alkali metal potassium in wheat straw ash can effectively promote the gasification of char. This results in a carbon conversion efficiency of 63.4 % without catalyst. This conversion rate is 2.6 times higher than that of the pickling wheat straw char (PWSC). At low temperature, the K-based catalyst exhibits a positive effect on the gasification of char. The H₂ yield is 118.60 mol/kg with carbon conversion efficiency 98.5 % under the condition of K/Al catalyst at 700 ℃. The H₂ yield and carbon conversion efficiency increased by 10.7 % and 12.4 % comparaed with that with Ca/Al catalyst, respectively. The H₂ yield and carbon conversion efficiency increased by 20.5 % and 31.0 % compared with Fe/Al catalyst. Ca/Al and Fe/Al catalysts can promote the water gas shift reaction, which trends to elevate the H₂ volume fraction, and reduce the CO volume fraction in the gasification products. By considering the carbon conversion, gas yield and gas composition volume fraction, the combination of certain Ca-based catalyst and K-based catalyst can regulate the gas composition. This generates a hydrogen rich gas with further purification.

Key words: wheat straw char, low temperature, steam gasification, catalyst

CLC Number:

TQ35
TK6

YU Yuan-yuan, XIAO Jun, SHEN Lai-hong, DU Yu-zhao. Catalytic Gasification of Wheat Straw Char at Low Temperature[J]. Chemistry and Industry of Forest Products, 2015, 35(1): 113-120.

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Catalytic Gasification of Wheat Straw Char at Low Temperature

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