Appraisal of underground coal gasification
The underground gasification process involves gaining access to the coal seam through shafts, slopes, or a single borehole, igniting the coal, supplying air or other gases or mixtures of gases, and withdrawing the combustion products. The two most difficult problems are roof collapse and loss in contacting efficiency in large cross sectional passages. In order to operate a system of underground gasification adequately and continuously, certain parameters need to be monitored so that the progress of gasification is known and so appropriate corrective actions can be taken to maintain the desired gasification conditions. Various methods of carrying out the process have been tried and are briefly discussed to indicate the scope and variety of past work on in-situ coal gasification. At present there is no known utilization of in-situ coal gasification.
- OSTI ID:
- 7220559
- Country of Publication:
- United States
- Language:
- English
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