Characterization of a novel two-stage high ash coal gasifier for low tar and high calorific value gas

Sharma, SK and Shivapuji, AM and Dasappa, S (2024) Characterization of a novel two-stage high ash coal gasifier for low tar and high calorific value gas. In: Applied Thermal Engineering, 237 . pp. 14-16.

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Abstract

The high ash content of coal poses two critical challenges in conventional gasifiers: (a) ash agglomeration and (b) low-quality syngas. The ash agglomerations are caused by the interaction of alkali and alkaline earth metals with other inorganic compounds, localized temperature generation, and unoptimized process parameters. Whereas low-quality gas is due to moderate temperature operations and the mixing of syngas with pyrolysis products. Recognizing these challenges, the current work discusses the design, development, and performance characterization of a novel two-stage gasification system that strategically segregates oxidative pyrolysis in a cyclone reactor and oxy-steam char gasification in a packed bed reactor. Such segregation provides explicit control over parameters like local temperatures, particle and gas residence time, enabling the configuration to handle coal with a wide range of ash content. Thermodynamic analysis and performance characterization experiments have been carried out with varied temperatures, oxygen, and steam flow rates. While operating the system up to 950�C, there was no indication of clinker formation. The gravimetric tar content was found 52 ± 3 mg/Nm3. The concentration of CO, CO2, CH4, and H2 in the product gas during experiments was 40 ± 5, 20 ± 5, 2 ± 1, and 45 ± 5, respectively. The carbon conversion was greater than 77, with further scope for improvement. © 2023 Elsevier Ltd

Item Type:	Journal Article
Publication:	Applied Thermal Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Agglomeration; Gasification; Packed beds; Pyrolysis; Storms; Synthesis gas; Tar; Temperature; Thermoanalysis, Ash agglomeration; Ash contents; Coal to chemical; Gasifiers; High ash coal gasification; High-ash coals; Low qualities; Low-tar syngas; Syn gas; Two-stage gasification, Coal
Department/Centre:	Division of Interdisciplinary Sciences > Center for Infrastructure, Sustainable Transportation and Urban Planning (CiSTUP) Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Date Deposited:	19 Jan 2024 09:14
Last Modified:	19 Jan 2024 09:14
URI:	https://eprints.iisc.ac.in/id/eprint/83607

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