The research of rice husk gasification in steam

doi:10.16085/j.issn.1000-6613.2017-0330

Abstract

Abstract: The rice husk gasification experiments were performed in a fluidized bed gasifier with steam as gasifying agent. The effects of reaction temperature(500-700℃),steam flow rate(7-11kg/h), and feed rate(1.2-3.6kg/h)on gas yield and the compositions of the main components(H₂,CO,CH₄,CO₂)were investigated,respectively. The results showed that the higher reaction temperature could lead to higher gas yield and higher content of H₂ and CH₄. With the increase of the reaction temperatures,the content of CO first decreased then increased. The effect of the increase of steam flow and feed rate on gas yield at 500℃ and 700℃ was not the same,which indicated that the leading reactions in the fluidized bed at different reaction temperature were different. At 700℃,the increase of the steam flow and feed rates did niot change the content of H₂,CO,and CO₂ significanly;and the volume fraction of CH₄ remained about 12%. Within the scope of the experimental conditions,when the reaction temperature was 700℃,steam flow 7kg/h,and feed rate 1.2kg/h,the gas yield and the volume fraction of H₂ reached the maximum values of 725L/h and 18.05%,respectively.

Key words: gasification, fluidized-bed, rice husk, steam

摘要： 在流化床实验装置上以水蒸气为气化剂，对稻壳进行热解气化的实验研究，分别考察单因素反应温度（500~700℃）、蒸气流量（7~11kg/h）和进料速率（1.2~3.6kg/h）对产气率及其主要组分（H₂、CO、CH₄、CO₂）的影响。实验结果表明：温度的升高可提高气化气产率及气体组分中CH₄和H₂的含量，同时降低了CO₂的含量，随温度升高，CO的含量呈先增加再降低的趋势。蒸气流量和进料速率的增加对产气率影响分别在500℃和700℃呈现出了不同的规律，说明了在不同反应温度下床内起主导作用的反应不同。在700℃，随蒸气流量和进料速率增加，气化气中H₂、CO和CO₂的含量都有小幅度变化，CH₄体积分数稳定在12%左右。在条件考察范围内，当反应温度为700℃、蒸气流量为7kg/h、进料速率为1.2kg/h时，产气率和H₂体积分数分别有最大值，为725L/h和18.05%。

关键词: 气化, 流化床, 稻壳, 水蒸气

CLC Number:

LI Hongliang, LI Jinhong, LI Yanhao, FANG Shuqi, CHEN Junying, LIU Liping, BAI Jing. The research of rice husk gasification in steam[J]. Chemical Industry and Engineering Progress, 2017, 36(11): 4017-4021.

李洪亮, 李金鸿, 李彦豪, 方书起, 陈俊英, 刘利平, 白净. 稻壳在水蒸气中气化实验研究[J]. 化工进展, 2017, 36(11): 4017-4021.

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