Issues with LNG screw compressors and methaneation flow rates
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Due to a malfunction that needed to be addressed in the TSA valve, the screw compressor and the raw gas centrifugal compressor were operated at no-load conditions. More than 3 hours later, once the TSA issue was resolved, the raw gas compressor began to operate at full load; however, both the circulation backflow control valve and the bypass valve of the screw compressor were closed. The speed of the raw gas centrifugal compressor was increased to 13,500 revolutions per minute, and the high and low pressure anti-surge valves were almost completely closed. Yet, the exhaust pressure of the raw gas centrifugal compressor was only 1.4 MPa (the design value being 2.8 MPa). The flow rate of methanation also failed to increase, and all the vent valves were stuck closed. Why is this?
Carefully check whether all vent, drain, and sewage outlets are open, and whether air is being supplied to the previous section. This needs to be checked and determined by you guys.