污泥与生物质共焚烧流化床反应器CPFD模拟与验证  

CPFD simulation and validation for a sludge and biomass co-incineration fluidized-bed reactor

作　　者：任少辉 林立 余桥 张立民 向家涛 张世红 REN Shaohui;LIN Li;YU Qiao;ZHANG Limin;XIANG Jiatao;ZHANG Shihong(State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Green Development Technology Co.LTD.,Wuhan 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院,煤燃烧与低碳利用全国重点实验室,武汉430074 [2]湖北加德科技股份有限公司,武汉430074

出　　处：《农业工程学报》2025年第5期257-267,共11页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划项目(2016YFB0600203);武汉市企业技术创新项目(2020020602012149)。

摘　　要：为了深入探究污泥和生物质共焚烧流化床反应器内的气体组分、气体速度、颗粒组分、颗粒速度、压力和温度分布等气固反应流动特征。基于计算颗粒流体力学方法CPFD(continuum particle fluid dynamics)研究了污泥和生物质共焚烧流化床反应器在二次风关闭和打开2种情况下的流化与反应状态。模拟结果表明,对于反应器的流化状态,二次风关闭时,床料在2s内稳定流化,集中于下部,稳定运行期间反应器径向呈现环核结构;二次风开启后,下部密相区降低,呈鼓泡流化状态,二次风口形成对冲状态。对于反应器的反应状态,二次风关闭时,燃料在反应器内迅速热解和燃烧,焦炭快速燃尽,气体燃料在进料口上方燃烧,形成高CO_(2)和H_(2)O浓度,O_(2)几乎耗尽。N污染物(HCN、CNO、NO)的转化区域主要在中下段,S污染物(H_(2)S、SO_(2))分布在上部。高温区主要在上部扩大段,最高温度为1217K,并开展中试验证,试验过程中炉内最高温度为1163.15K,误差4.6%,误差在可接受范围内。炉内燃烧最高温度二次风开启后,气体燃料浓度升高,分布区域扩大但限于二次风以下,燃料快速燃尽,污染物CNO、NO分布更均匀,SO_(2)高浓度区域集中于顶部。该研究结果为污泥和生物质共焚烧流化床反应器的流化与反应状态分析以及为反应器的结构设计和改进优化提供了依据。A hot fluidized bed reactor has been widely used in sustainable agriculture in recent years.Complex A complex flow of gas-solid reaction can be found in the internal reactor,including the distribution of gas components,gas velocity,particle composition,particle velocity,pressure distribution,and temperature distribution within the bed.However,these parameters are often difficult or impossible to measure during the actual operation of the reactor,due mainly to the experimental conditions and conventional measurement.Numerical simulation can be expected to identify the operating parameters in the fluidized bed reactor,in order to optimize the reactor design and operation.Furthermore,the iterative promotion of the reactor can be accelerated to significantly reduce the design and construction costs.In this study,the systematic simulation was carried out on a 10 t/d sludge and biomass co-incineration fluidized bed reactor using the Computational Particle Fluid Dynamics(CPFD).The fluidization and reaction states of the reactor were determined under both closed and open secondary air conditions.The simulation results indicate that the reactor operated normally under rated design parameters,with the reasonable gas-solid fluidization and high fuel conversion rates,particularly with the minimal fuel slip in the flue gas.In the fluidization state,the bed material reached the stable fluidization within 2 s,primarily concentrated in the lower part of the reactor,when the secondary air was closed.The concentration of particles in the dilute phase decreased with the height,with no significant particle outflow observed.Furthermore,the reactor exhibited a core-annulus structure during stable operation,with the solid content in the center lower than that at the wall.The highest pressure was found at the air distribution plate.The significant fluctuations of pressure occurred at various measurement points after fuel addition,indicating the intense combustion disturbances.The distribution of gas-solid velocity showed that the high g

关 键 词：污泥 生物质 共焚烧 流化床 CPFD模拟 

分 类 号：X703[环境科学与工程—环境工程]