生物质双床气化流化床燃烧炉燃烧强度模拟研究  

Simulation study of combustion intensity in a fluidized bed combustion furnace for biomass double bed gasification

作　　者：张继达 范晓旭[2,3] 刘彦丰 关海滨[2,3] ZHANG Jida;FAN Xiaoxu;LIU Yanfeng;GUAN Haibin(School of Energy and Power Engineering,North China Electric Power University,Baoding,Hebei 071003,China;Energy Research Institute of Shandong Academy of Science,Jinan,Shandong 250014,China;Key Laboratory for Biomass Gasification Technology of Shandong Province,Jinan,Shandong 250014,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]山东省科学院能源研究所,山东济南250014 [3]山东省生物质气化重点实验室,山东济南250014

出　　处：《河北工业大学学报》2018年第4期26-30,36,共6页Journal of Hebei University of Technology

基　　金：山东省自然科学基金(ZR2015YL001);山东省科学院基础基金(科基合字201506)

摘　　要：生物质是一种清洁可再生能源,双床气化装置可高效利用生物质能源,高燃烧强度燃烧炉可提高双床气化装置效率.由于流化床燃烧炉内易实现半焦高效燃烬和热量平衡,流化床燃烧炉可实现高强度燃烧.本文采用热烟气作为气体介质,应用syamlal-obrien曳力模型对高燃烧强度的流化床燃烧炉进行三维数值模拟,获得流化床燃烧炉内部固相流动及分布情况.结果表明:流化床燃烧炉能够实现密相区内物质和能量的快速交换,实现燃料的高效反应,提高燃烧炉强度应主要从底部密相区入手;并且削减稀相区空间也可实现燃烧炉燃烧强度的提升.燃烧炉随着高径比的减少,热载体循环量和燃烧强度都会提升;燃烧炉高度从5 m降到3 m,燃烧强度从942.7 k W/m3增加到1 571.17 kW/m3.Biomass is a kind of clean and renewable energy. The double bed gasification device can efficiently utilize biomass energy, and the combustion furnace with high combustion intensity can improve the efficiency of the double bed gasification device. This study analyzed the flow and distribution of solid phase in the combustion furnace by numerical sinmlation, which provided the basic data for the design of high combustion intensity combustion furnace and the flow field organization. This study used the hot flue gas as the gas medium, and applied syamlal-obrien drag model in the three-dimensional numerical simulation of high combustion intensity combustion furnace. The results show that fluidized bed combustion furnace can realize the rapid exchange of material and energy in the dense phase zone and achieve efficient fuel reaction. Therefore, increasing combustion intensity of combustion furnace should focus on the bottom dense phase zone. Meanwhile the reduction of the lean phase zone can also promote the combustion intensity of the combustion furnace. With the decrease of the aspect ratio, the circulation capacity of heat carrier and combustion intensity will increase. With the furnace height dropping from 5 m to 3 m, the combustion intensity increases from 942.7 kW/m^3 to 1 571.17 kW/m^3.

关 键 词：生物质 双床气化 流化床燃烧炉 燃烧强度 数值模拟 

分 类 号：TK6[动力工程及工程热物理—生物能] TK229.66