Abu Dhabi Gas Liquefaction Company Ltd Job Training Mechanical Technician Course Module 9 Compressors
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- Figure 6.5
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Figure 6.4: Knockout Drums
(a) Vertical Knockout Drum (b) Horizontal Knockout Drum Mist extractor Mist extractor Gas outlet Gas outlet Suction pressure valve Suction pressure valve Baffle Baffle Gas inlet Gas inlet Liquid level controller Liquid level controller Drain valve Drain valve Manual drain valve Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 81 of 90 Knockout drums are not only used at the compressor intake. Gas (or vapour) is turned into liquid by first increasing its pressure and then cooling it. We do not want the gas to start to liquefy while it is in the compressor as this can damage the compressor. Some gases need less cooling and lower pressures to change them to liquid than others. If the gas being compressed is a mixture of gases, those that liquefy more easily may start to change inside the compressor. To avoid this, the gas may also pass through knockout drums between compressor process stages. It also passes through a discharge knockout drum after the final stage. This makes sure that gas entering the next stage of the process contains no liquid droplets. Figure 6.5 shows the suction and discharge knockout drums for the New Boil-off Gas Compressor. Knockout drums are sometimes called scrubbers or separators. (a) Suction Knockout Drum (b) Discharge Knockout Drum Figure 6.5: Knockout Drums for New BOG Compressor Personnel & Training Division Job Training—Mechanical Technician Compressors/Rev. 0.0 Page 82 of 90 Download 0.5 Mb. Do'stlaringiz bilan baham: 
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