低阶碎煤流化床两段气化中试试验

摘要

To verify the feasibility and technical features of the fluidized bed two-stage gasification technology for the production of clean fuel gas,a pilot autothermal platform with a capacity of 100 kg/h has been designed and built to test the gasification characteristics of Inner Mongolia Shengli lignite.The running state and the product quality were compared systematically under different typical operational conditions.Keeping the reaction temperatures of pyrolyzer and gasifier at around 840 ℃ and 1 000 ℃ respectively,the corresponding tar content in the generated gases at the outlets of pyrolyzer and gasifier were 1 127 mg/Nm3 and 365 mg/Nm3.Under a stable operation state,the volume fractions of CO,H2,CH4 and CO2 in the produced fuel gas were 13.9％,7.9％,3.9％ and 10.9％ respectively,and the heating value of product gas was close to 4 605 kJ/Nm3.Compared with the tar from pyrolyzer,the heavy oil fraction of tar from gasifier reduced significantly,while the light oil components increased sharply simultaneously,showing an effective tar thermal cracking and catalytic reforming in the high-temperature char bed of gasifier.%为验证流化床两段气化工艺制备清洁燃气的可行性和技术特色,在煤处理量为l00 kg/h的中试平台上考察了内蒙胜利褐煤的气化特性,对比了典型操作条件下装置的运行情况和产物品质.试验结果表明,当热解器和气化炉温度分别控制在840℃和1 000℃时,热解器和气化炉出口处气体中焦油含量分别为1 127 mg/Nm3和365 mg/Nm3.在稳定条件下气化气组分中CO,H2,CH4和CO2的体积分数分别为13.9％,7.9％,3.9％和10.9％,热值维持在4 605 kJ/Nm3左右.与热解气中焦油组分相比,气化气中所含焦油组分中重质组分显著减少,而轻质组分增多,表明输送床反应器内高温有氧环境及半焦床层的催化重整作用具有良好的焦油脱除效果.