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2003 Course Natural Gas Technology

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Total No. of Questions : 10] P1620 [Total No. of Pages : 4 [3764]-399 B.E. (Petrochemical) NATURAL GAS TECHNOLOGY (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Q2) a) Give the Indian Scenario of natural gas with respect to production and utilization. [8] Discuss the origin of hydrocarbons of natural gas in detail. [8] With the help of diagrams, discuss the Coalbed methane production technologies. [8] b) Elaborate on 'Indian Scenario of Gas Hydrates'. [8] Q3) a) Elaborate on 'Basic structures of Gas Hydrates'. [8] b) With the help of phase diagram of a reservoir fluid explain each of the following: [8] i) Critical point. ii) Cricondentherm. iii) Cricondenbar. iv) Retrograde condensation. P.T.O. Q4) Write short notes on following (Any 4): [16] a) Sampling of Natural Gas. b) Solubility of Natural Gas in Water. c) Determination of Hydrate Formation point. d) Hydrate Prevention. e) Oil and Gas Reserves. f) Origin of Non-Hydrocarbon components of Natural Gas. Q5) a) A natural gas has a heating value of 1600 Btu/scf. If this gas is combusted to generate power of 1000 kW, what is the required gas flow rate in Mscf/day? Assume that the overall efficiency is 80%. [5] (1 kW = 1903 Btu / hr). b) For the gas composition given below, determine apparent molecular weight, pseudocritical pressure and pseudocritical temperature of the gas. [8] Component Mole fraction yi Critical Pressure Pci, psia Critical Temperature Tci, R C1 0.771 673 344 C2 0.087 709 550 C3 0.021 618 666 i - C4 0.006 530 733 n - C4 0.002 551 766 i - C5 0.003 482 830 n - C5 0.008 485 847 C6 0.001 434 915 C+ 7 0.001 361 1024 N2 0.055 227 492 CO2 0.025 1073 548 H2S 0.020 672 1306 Take molecular weight of C + as 114. 7 [3764] - 399 2 c) A 0.65 specific gravity natural gas contains 10 mole % N2, 8 mole % CO2 and 2 mole % H2S. Estimate viscosity of the gas at 10000 psia and 180 F. [5] Data: i) The atmospheric pressure viscosity ( 1) = 0.013 cp. ii) Reduced viscosity ( r) at 10000 psia and 180 F = 1.602. Make use of following equations 1) TPC = 326 + 315.7 ( g 0.5) 240 YN2 83.3 YCO2 + 133.3 YH2S Where TPC = Pseudo critical temperature in R. = Gas - specific gravity. g YN , YCO , YH 2 2 2S = Mole fractions of N2, CO2 and H2S respectively. 2) r = ln g T pr 1 Where TPr = Pseudo reduced temperature. Where g = Gas viscosity in cp SECTION - II Q6) a) Give the significance of natural gas processing. Also give the typical specifications of a commercial gas. [6] b) With the help of diagram, discuss multistage separation of condensates from natural gas. [8] c) Draw a well labelled sketch of a vertical gas-liquid separator. Q7) a) b) [4] Enlist at least eight desirable properties of a solvent used for dehydration of natural gas. [8] Enlist at least four points for each of the following: [8] i) Desirable properties of an adsorbent for dehydration of natural gas. ii) Main characteristics of an adsorption process for dehydration of natural gas. [3764] - 399 3 Q8) a) Describe with flow sheet the process for acid gas removal from natural gas by amine scrubbing. [12] b) Explain the role of methanol in an integrated natural gas processing.[4] Q9) a) Elaborate on 'Pipes' as one of the natural gas pipeline components. [8] b) Give the significance of 'Pigging' and discuss any four safety precautions associated with natural gas pipeline in brief. [8] Q10)Write short notes on following (Any 4): a) Cold - Box shuttle. b) LNG Terminals in India. c) LNG Boil - off Gas. d) Methane Conversion Technologies. e) Natural Gas Storage in an Aquifer. f) LNG carriers with self-supporting Tanks. Y [3764] - 399 4 [16]

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