关键词:

热解拔头, 流化床, 焦油, 反应气氛

Abstract:

Coal utilization can be improved by coupling a fluidized bed pyrolyzer to a CFB boiler, which enables a co-production of pyrolysis oil and electricity. In this process, the pyrolyzer uses generally the self-generated pyrolysis gas as the fluidizing gas. The present study deals with the pyrolysis oil production in a fluidized bed reactor through using a simulated pyrolysis gas as the reaction atmosphere,and both the yield and composition were analyzed with TG-FTIR. For a bituminous coal used in steam boilers, the oil yield reaches its possible peak value of 13%(mass,daf). The presence of H₂ and CO₂ in the reaction atmosphere decreases the tar yield, whereas the addition of CO and CH₄ into the atmosphere increases the tar production. TG-FTIR analysis demonstrated that adding H₂ into the pyrolysis atmosphere increases the contents of phenolic and carboxylic compounds in the produced pyrolysis oil, while it promotes as well the cracking of aliphatic hydrocarbons during pyrolysis. Adding CH₄ causes more aliphatic hydrocarbons, single aromatic ring chemicals and phenolic compounds in the pyrolysis oil.

Key words:

热解拔头, 流化床, 焦油, 反应气氛