Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV GEOLOGICAL AND TECHNOLOGICAL FACTORS OF COAL GASIFICATION CBM, SHALE GAB Previous Question Paper (July - 2019 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
What are the conditions suitable for UCG?
Answer
Suitable conditions for Underground Coal Gasification (UCG) include a coal seam thickness of at least 2 meters, a depth between 100 and 1000 meters, and a low permeability overburden to prevent gas leakage. Additionally, the coal should have low ash content and be located in a geologically stable area with minimal faulting.
What are the chemical reactions will take place in UCG?
Answer
The primary chemical reactions in UCG are: 1) Partial oxidation: C + O2 → CO2 + heat; 2) Water-gas reaction: C + H2O + heat → CO + H2; 3) Boudouard reaction: C + CO2 + heat → 2CO; and 4) Methanation: C + 2H2 → CH4.
What are the factors that will be responsible for heating value of the product gas?
Answer
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What are the concepts of underground steep seam gasification?
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Explain the concept of stream method of UCG?
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Explain the concept of boring method of linkages?
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Selection criteria of location of mining project?
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What are the major equipment should be available for starting UCG mine site?
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Explain about compressed linkage technique?
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What is Electro Linkage Technique?
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Part B
What are the principles under which UCG can take place? What are the advantages of UCG?
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Explain the constituent processes of underground coal gasification in detail.
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What are the conditions under which coal gasification is allowed in Indian coal mines? Are there any coal seams suitable for UCG available in India?
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What are different kinds of mining methods used for underground coal gasification?
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Explain the Chamber method of extraction with schematic diagram.
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What are different kinds of linkages you can adopt between boreholes? Explain them in brief.
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What are the precautions you need to take while you are extracting underground coal gasification at great depth?
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In case of steeply dipping of coal seams, which methods you will be adopting in UCG? Explain extraction methods.
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Explain the future scope of UCG methods and how you are expecting Innovative Development of UCG will take place?
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Explain about the following:
- Hydraulic fracture linkage
- Compressed-air-linkage.
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