Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV Year GEOLOGICAL AND TECHNOLOGICAL FACTORS OF COAL GASIFICATION CBM, SHALE GAB Previous Question Paper (May - 2019 - R15)
Note: This question paper contains two parts A and B. 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 and may have a, b, c as sub questions.
PART - A
What is underground coal gasification?
Answer
Underground Coal Gasification (UCG) is an industrial process that converts coal in-situ into a combustible gas mixture (syngas) by injecting oxidizing agents like air, oxygen, or steam into an underground coal seam, without the need for traditional mining.
Explain the chemical reaction of underground coal gasification.
Answer
The primary chemical reaction involves the partial oxidation of coal. The main reactions are:
These reactions produce a mixture of carbon monoxide, hydrogen, and methane, which serves as the fuel gas.
What are the factors to be considered for UCG?
Answer
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What is opening of coal seam for UCG?
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What are the mining methods of UCG?
Answer
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Write a short note on blind bore hole method.
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Name non-mining methods of UCG?
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What is a factor considered for selection of suitable site for UCG?
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What is Electro linkage?
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Write a note on hydraulic fracture linkage.
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PART - B
Explain, in detail, with suitable figures, the concept and chemistry of underground Coal gasification (UCG).
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Explain Principles of UCG, with suitable equations. What are its advantages and disadvantages?
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Explain the Technology of UCG with suitable figures, giving its applicability and limitations.
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Explain the process of opening up of coal seam for UCG. What are precautions to be taken during such process?
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Explain in detail, with a figure, the stream method of UCG. Mention its applicability, advantages and disadvantages.
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Discuss on the borehole method of UCG. Give its applicability and limitations?
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Explain the level seams method of UCG.
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Explain the Inclined Seams method of UCG.
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Explain non-mining method of UCG, when an inclined seam is available. Mention it’s advantages and disadvantages. Assume relevant data, if necessary.
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What is different linkage techniques used for UCG? Explain any two methods in detail and give their applicability and advantages.
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Explain, in detail, the electro linkage, with suitable figures. Give their applicability and disadvantages.
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