摘要
Abstract
During the combustion of biomass boilers,there are common problems such as uneven tempera-ture distribution inside the furnace,insufficient straw combustion inside the furnace,high carbon content in fly ash and slag,and high concentration of pollutants(NOx)emissions.Taking the 30 MW biomass water-cooled vibration grate furnace of a biomass power plant as the research object,based on Flic and Fluent software,the influence of different primary air rates(70%,60%,55%,50%)and four types of secondary air and burnout air ratios on the gas-solid combustion characteristics of the boiler was simulated and ana-lyzed.The conclusion was drawn that when the primary air rate increased(70%benchmark),the peak combustion temperature increased and advanced,the release of volatile matter accelerated,and the fixed carbon burnout time shortened,but had no significant effect on water evaporation.When the wind rate de-creases(55%,50%),the temperature distribution inside the furnace becomes more uniform,the outlet flue gas temperature and oxygen content decrease,and the flame stabilizes below the furnace arch.When the primary air flow rate is fixed,condition 3(m front wall secondary air flow rate∶m rear wall secondary air flow rate∶m burnout air flow rate=1∶2∶1)has the best effect,with an increase in furnace outlet tem-perature and a decrease in flue gas oxygen content and the mass of NO concentration.关键词
生物质锅炉/水冷振动炉排/风率配风比例/数值模拟Key words
biomass boiler/water-cooled vibrating grate/wind rate and air distribution ratio/numerical sim-ulation分类
能源科技
