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Heavy tar evolution characteristics during advanced sludge pyrolysis and biomass gasification integrated process
Hengda Han1, Aishu Li1, Meng Zhu1
1State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
The Science of the Total Environment
|September 2, 2022
Summary
The sludge pyrolysis and biomass gasification integrated process produces heavy tar, rich in nitrogen. This study reveals how sludge-derived organics and steam influence heavy tar formation and composition during this process.
Area of Science:
- Chemical Engineering
- Environmental Science
- Materials Science
Background:
- Sludge pyrolysis and biomass gasification integrated processes (SPBG) offer comprehensive resource utilization.
- SPBG generates more tar than traditional biomass steam gasification, posing environmental and operational challenges.
- Heavy tar components and nitrogen-rich compounds in SPBG contribute to pollution and coke formation.
Purpose of the Study:
- To investigate the evolution of heavy tar, particularly nitrogen-rich components, during the SPBG process.
- To elucidate the formation mechanisms of heavy tar components under varying sludge volatile to biomass ratios.
Main Methods:
- Analysis of heavy tar composition within the 150-450 Da mass range.
- Identification of key chemical reactions, including deamination and condensation.
- Evaluation of the roles of sludge-derived organics and steam in tar formation and cracking.
Main Results:
- Heavy tar components, primarily nitrogen-containing aromatics, were abundant in the 150-450 Da range.
- Deamination and quinoline condensation were linked to heavy component generation.
- Sludge organics formed heavier oxygen-containing molecules, while sludge steam promoted tar cracking and inhibited catalytic cracking via radical consumption.
Conclusions:
- Heavy tar generation is influenced by the sludge volatile/biomass ratio.
- Low ratios favor heavy molecule generation, while high ratios decrease aromatic content in heavy tar.
- Understanding these mechanisms is crucial for optimizing SPBG processes and mitigating tar-related issues.
