On LNG production from coke oven gas
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Excuse me, Haiyou – which company uses membrane separation technology before liquefaction in the process of converting coke oven gas into LNG? What are the advantages of using membrane separation versus going straight to liquefaction without membrane separation?
Shanxi Huayang W uses membrane separation technology, but it does not liquefy the gas; instead, it directly supplies SNG to the city’s gas distribution network.
Does their process use methanation? What is the hydrogen separated by membrane separation used for?»
They use new technology: after methanation, direct membrane separation is employed; it’s unclear what purpose hydrogen serves. Just left after studying here with us. They haven’t driven yet.
Is the methane gas after membrane separation fed directly into the pipeline network, or does it need further treatment?
It should be, I didn’t look at their specific PID diagrams; I only had a brief understanding of them.
What are the percentages of methane and hydrogen in your company’s product after methanation?
Specifically, look at the hydrogen-to-carbon ratio, the hydrogen-carbon ratio. Regardless of your methane content, you need to remove water and mercury.
If, after methanation, the hydrogen content is still around 30% and methane content is around 68%. In this case, after dehydration and demercurization, is it appropriate to proceed directly with deep cryogenic liquefaction, or should methane first be concentrated using membrane separation before liquefaction? Will the energy consumption for liquefaction cooling be higher in the presence of 30% hydrogen?