It is desired to produce liquefied natural gas (LNG), which we consider to be pure methane, from that gas at 1 bar and 280 K (conditions “1” in the Linde process of the diagram). Leaving the cooler (“enfriador”) methane is at 100 bar and 210 K. The flash drum (“separador”) is adiabatic and operates at 1 bar. The recycled methane leaving the heat exchanger is at 1 bar and 200 K. The compressor can be assumed to operate reversibly and adiabatically. However, because of the large pressure change, a three-stage compressor with intercooling is used. The first stage compresses the 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 gas is isobarically cooled to 280 K.
(a)For each point in the Linde diagram write the conditions you know, and find the corresponding points in the H-P diagram for methane.
(b)Calculate the fractions of vapor and liquid leaving the flash drum.
(c)Calculate the amount of compressor work required for each kg of LNG produced.
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