Coke oven gas methanation compressor
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Reciprocating machine. Screw compressors, centrifuges. That one is more suitable
Reciprocating compressors are generally used for coke oven gas compression; if the medium is clean and free of solids, centrifugal compressors can also be used.
It depends on the composition; if it’s clean, then many types can be used, but in practice this isn’t feasible. The cost of preprocessing would increase, and since the gas contains tar, a high flow rate leads to significant accumulation of tar, which is harmful to the equipment. Therefore, there aren’t many real options for compressing coke oven gas. Vane and rotary vane compressors are better because they are more resistant to dirt
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Reciprocating types are generally chosen; if the medium is clean and free of solids, centrifugal types can also be used. Liquid ring and vane types are even better, as they are more resistant to dirt
It mainly depends on your medium, flow rate, and processing conditions. In short, reciprocating types are suitable for low flow rates and situations with some impurities; they require the least investment, but involve more maintenance later on. It’s best to have a backup unit； For screws with high flow rates and containing impurities, the investment is higher than that for reciprocating types; they have a higher maintenance rate and lower efficiency, and a spare unit is required ； Centrifuges have specific requirements regarding the medium they operate with; they need to operate stably and have a high flow rate, and usually one unit is sufficient. The investment cost is high, but it is stable.
If unpurified gas is used, a screw compressor is the best choice, as it is resistant to dirt； Tar, naphthalene, and other substances present in coke oven gas can cause blockages in the gas valves, requiring frequent cleaning and resulting in high maintenance costs.
What is the long-term stability of screw compressors? Which manufacturers can reliably handle high flow rates and high pressure differences? Please discuss.
It seems there are no screw compressors designed for high flow rates; screws have strict requirements regarding impurities – who says that the presence of impurities makes them suitable for use with screw compressors? . . In China, you can ask about Shanghai 711
An inlet volume flow rate of 80,000 cubic feet can be achieved with a screw diameter of 816 mm
What is the volumetric flow rate at the 80,000 cubic meter inlet, what is the pressure difference, and how many stages are there?