石油焦对生物质气化中焦油裂解的影响

引言 生物质作为一种清洁可再生能源正在受到世界各国的重视.生物质气化是生物质高品位利用的一种主要技术,但在气化过程中产生的焦油对装置的长周期平稳运行有严重危害,一方面低温时焦油易凝结为黏稠的液体,与灰粒一起堵塞输气管道;另一方面焦油的存在还会降低气化效率1-6],这在一定程度上影响了生物质气化技术的推广应用,因此有必要采取措施降低气化气中的焦油量.

Effect of petroleum coke on tar cracking in biomass gasification process

To explore an effective method for reducing tar yield in biomass gasification, effects of petroleum coke on tar cracking during the gasification process of lees were examined. The influences of petroleum coke feeding mode and particle size, water content in lees were tested in an electrically heated fixed bed tubular reactor at 700℃ under atmospheric pressure. Results show that the petroleum coke obviously affects the tar cracking in biomass gasification. Entering petroleum coke before lees into the reactor and using small petroleum coke particles are favorable for the tar cracking. The water content in lees also promotes the tar cracking and the yields of H₂ and CO, however has little impact on the productions of CH₄. The results are helpful to the research and development of the new co-gasification process of high water content biomass and petroleum coke.