It is desired to produce liquefied natural gas (LNG), which we consider to be pure methane,...

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Mechanical Engineering

It is desired to produce liquefied natural gas (LNG), which weconsider to be pure methane, from that gas at 1 bar and 280 K(conditions â€œ1â€ in the Linde process of the diagram). Leaving thecooler (â€œenfriadorâ€) methane is at 100 bar and 210 K. The flashdrum (â€œseparadorâ€) is adiabatic and operates at 1 bar. The recycledmethane leaving the heat exchanger is at 1 bar and 200 K. Thecompressor can be assumed to operate reversibly and adiabatically.However, because of the large pressure change, a three-stagecompressor with intercooling is used. The first stage compressesthe gas from 1 bar to 5 bar, the second stage from 5 bar to 25 bar,and the third stage from 25 bar to 100 bar. Between stages the gasis isobarically cooled to 280 K.
(a)For each point in the Linde diagram write the conditions youknow, and find the corresponding points in the H-P diagram formethane.
(b)Calculate the fractions of vapor and liquid leaving the flashdrum.
(c)Calculate the amount of compressor work required for each kgof LNG produced.

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3.6 Ratings (601 Votes)

Assume the Process are steady state and Reversible adiabatic Mass Balance Min Mout 0 Steady Flow Mout Min M Energy Balance MinHin MoutHout W 0 W M Hout Hin Entropy Balance MinSin MoutSout 0 Sout Sin From tables At P1 bar and T 280K Enthalpy Hin 940 KJkg and Entropy Sin 72 KJkgK At Pressure P 5bar and See Answer

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