生物质双床气化流化床燃烧炉燃烧强度模拟研究

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5m降到 3m，燃烧强度从942.7kW/m3增加到1571.17kW/m3.
Biomassisakindofcleanandrenewableenergy.Thedoublebedgasificationdevicecanefficientlyutilize biomassenergy,andthecombustionfurnacewithhighcombustionintensitycanimprovetheefficiencyofthedoublebed gasificationdevice.Thisstudyanalyzedtheflowanddistributionofsolidphaseinthecombustionfurnacebynumerical simulation,whichprovidedthebasicdataforthedesignofhighcombustionintensitycombustionfurnaceandtheflow fieldorganization.Thisstudyusedthehotfluegasasthegasmedium,andappliedsyamlal-obriendragmodelinthe three-dimensionalnumericalsimulationofhighcombustionintensitycombustionfurnace.Theresultsshowthatfluid? izedbedcombustionfurnacecanrealizetherapidexchangeofmaterialandenergyinthedensephasezoneandachieve efficientfuelreaction.Therefore,increasingcombustionintensityofcombustionfurnaceshouldfocusonthebottom densephasezone.Meanwhilethereductionoftheleanphasezonecanalsopromotethecombustionintensityofthecom? bustionfurnace.Withthedecreaseoftheaspectratio,thecirculationcapacityofheatcarrierandcombustionintensity willincrease.Withthefurnaceheightdroppingfrom5mto3m,thecombustionintensityincreasesfrom942.7kW/m3to 1571.17kW/m3.