Steam gasification of polyethylene was conducted using a two-stage gasifier consisting of a fluidized bed gasifier and a tar-cracking reactor filled with active carbon. The main aim of the work was to produce H₂-rich syngas and simultaneously reduce tar. The main reaction variable was the steam-to-fuel ratio. The possibility of gasification without using an electrostatic precipitator was also examined in the study. In addition, the effect of the type of distributor (hook-type and mesh-type distributor) located between the fluidized bed gasifier and tar-cracking reactor on coke formation was investigated. Finally, the possibility of in situ regeneration of active carbon with steam was explored. As a result, the syngas from the two-stage gasifier contained a maximum 66 vol% hydrogen and a minimum 0 mg/Nm³ tar. The syngas produced without using an electrostatic precipitator had similar quality to that obtained with an electrostatic precipitator, providing a positive indication for the implementation of the two-stage gasifier in commercial applications. Additionally, the mesh-type distributor was found to be excellent against coke formation. The in situ regeneration of active carbon with steam significantly recovered the textural properties of the original active carbon, yielding a surface area recovery rate of approximately 63%. A long-term gasification for 4 h with repetitive in situ regeneration of active carbon with steam produced a syngas having 55 vol% H₂ on average and toluene as a tar component.

使用两级气化器对聚乙烯进行蒸汽气化，该气化器由流化床气化器和填充有活性炭的焦油裂化反应器组成。这项工作的主要目的是生产富含H _2的合成气并同时减少焦油。主要反应变量是蒸汽/燃料比。在研究中还检查了不使用静电除尘器进行气化的可能性。另外，研究了位于流化床气化炉和焦油裂化反应器之间的分配器类型（钩型和网孔型分配器）对焦炭形成的影响。最后，探讨了用蒸汽原位再生活性炭的可能性。结果，两级气化炉的合成气含氢量最大为66％，最小为0 mg / Nm³焦油。不使用静电除尘器生产的合成气具有与使用静电除尘器获得的合成气类似的质量，为在工业应用中实施两级气化炉提供了积极的指示。另外，发现网状分布器对结焦是极好的。用蒸汽原位再生活性炭可显着恢复原始活性炭的组织性质，表面积回收率约为63％。长期气化4小时，再用蒸汽对活性炭进行重复性原位再生，生成的合成气平均具有55％（体积）的H ₂和甲苯作为焦油成分。