秸秆热解-页岩灰催化裂解生产低焦油生物合成气

发布时间：2018-03-08 09:17

  本文选题：热解　切入点：裂解　出处：《化工学报》2017年10期 　论文类型：期刊论文

【摘要】：为从高粱秸秆生产高品质、低焦油含量生物合成气,基于其单段热解特性研究,借助两段式固定床反应器实施两段热解(热解+裂解),同时考察页岩灰对热解挥发分的催化裂解效果。结果表明:相对单段热解,两段热解强化了水蒸气与挥发分(尤其是与热解气)的交互;提高裂解温度促进焦油裂解和重整,便利了热解气的生成,同时提高合成气(H_2+CO)的产率和H_2/CO体积比;裂解中加入页岩灰显著促进生物焦油气化,大幅降低气体产物焦油含量:裂解温度适中(约850℃)时(450℃热解),热解气产率超过40%(质量),焦油产率低于1.0%(质量),合成气产量约186 ml·g~(-1)、体积分数高达64%,且H_2/CO比超过0.5。页岩灰便利H_2的生成,主要源于其铁组分对水气变换的催化作用。
[Abstract]:In order to produce high quality and low tar content biogenic syngas from sorghum straw, a single stage pyrolysis study was carried out. Two-stage pyrolysis (pyrolytic pyrolysis) was carried out by means of a two-stage fixed-bed reactor, and the catalytic pyrolysis effect of shale ash on pyrolysis volatiles was investigated. The two-stage pyrolysis enhanced the interaction between water vapor and volatile matter (especially pyrolysis gas), increased the pyrolysis temperature to promote the cracking and reforming of tar, facilitated the formation of pyrolytic gas, and increased the yield of H _ 2CO and the volume ratio of H _ 2 / CO to H _ 2 / CO. The addition of shale ash into the pyrolysis can significantly promote the gasification of biological tar. Significant reduction of tar content of gas products: pyrolysis at moderate pyrolysis temperature (about 850 鈩，

本文编号：1583299