DOI: 10.1016/j.jcou.2017.06.021
Scopus记录号: 2-s2.0-85025599812
论文题名: Laboratory scale studies on CO2 oxy-fuel combustion in the context of underground coal gasification
作者: Kumari G. ; Vairakannu P.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 21 起始页码: 177
结束页码: 190
语种: 英语
英文关键词: CO2 gasification
; Syngas
; Thermo gravimetric studies
; Underground coal gasification (UCG)
Scopus关键词: Calorific value
; Carbon dioxide
; Carbonization
; Coal
; Coal deposits
; Coal gasification
; Fuels
; Gases
; Gravimetric analysis
; Pyrolysis
; Reforming reactions
; Synthesis gas
; Waste incineration
; Inorganic species
; Northeast regions
; Oxyfuel combustion
; Oxygen-enriched air
; Pyrolysis products
; Syn-gas
; Thermo-gravimetric
; Underground coal gasification
; Coal combustion
英文摘要: Oxidizing/gasifying agents play an essential role in the economy of underground coal gasification (UCG). The selection of feed gases to UCG depends on the prevailing conditions and inherent properties of a coal seam. Steam based UCG operation would lead to transportation and operational difficulty for efficient gasification. Alternatively, CO2 gas is a potential gasifying medium for coal gasification and this option would ensure the reutilization of waste CO2 gas in a UCG operation. Thus, in the present study, borehole coal combustion and gasification experiments are carried out to simulate CO2 enhanced UCG system using a low ash coal originating from the Northeast region of India. UCG experiments are simulated in a laboratory scale using CO2/O2 gases and the results are compared with pure oxygen and oxygen enriched air based UCG operation. The composition and calorific value of syngas are analysed for various gasifying agents. The CO2/O2 borehole experimental studies show that a CO enriched product gas (∼40 vol.%) can be generated under dried coal seam conditions. Thermo-gravimetric analysis (TGA) studies show that the rate of pyrolysis is higher under a CO2 atmosphere as compared to N2 atmosphere. Further, the TGA results show that the generated CO2 pyrolysis products led to substantial char gasification even at low temperatures. The reactivity of tar with CO2 enhanced the calorific value of the product gas due to dry reforming reactions. Also, the presence of suitable inorganic species in the coal progressed the CO2 gasification through ash catalysis. © 2017 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52643
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Kumari G.,Vairakannu P.. Laboratory scale studies on CO2 oxy-fuel combustion in the context of underground coal gasification[J]. Journal of CO2 Utilization,2017-01-01,21