Experimental Investigation of Tar Recycling in Pilot-Scale Down-Draft Biomass Gasifiers: Prospects, Operating Procedures, Process Variations, and Controls


Tar is Considered the Main Barrier to Commercial Power Generation When using Biomass Gasification as It Causes Serious Environmental Issues, Even after Incorporating an Efficient Removal System. Moreover, the Existing Tar Compositions Contain High Energy Levels, Thus Lowering the Heating Value of Produced Syngas. in This Paper, Tar Was Blended with Three Types of Plain Biomass at Ratios Up to 10%; Biomass and Tar Were Gasified Together at Different Equivalence Ratios. Tar Recycling Was Found Beneficial to the Syngas Compositions. the Size Distribution of the Biomass Feed and the Gasified Char Were Studied. Experimental Evidence Shows that the Isolation Time of the Shutdown Procedure is Proportional to the Volume of the Gasifier Cores. This Paper Discusses the Operation Procedure and Troubleshoots Biomass Gasifiers in Detail, Providing Useful Guidelines for Future Practical Research.


Chemical and Biochemical Engineering

Keywords and Phrases

biomass conversion; Renewable fuel; syngas production; tar circulation

International Standard Serial Number (ISSN)

1759-7277; 1759-7269

Document Type

Article - Journal

Document Version


File Type





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Publication Date

01 Jan 2023