Start-up and shutdown of reciprocating compressors
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Our plant uses reciprocating compressors for methanol synthesis, of the 3-stage 4-row type. Fresh gas is compressed in two stages and then mixed with the recycled gas generated during synthesis in the third stage to form a mixed gas that is sent to the synthesis process. The compressors come in configurations such as 1-1, 2-1, and 3-3; we’re not sure how to start and stop these compressors. . .
First of all, it is necessary to follow the operating procedures strictly, as they are highly specific and authoritative. According to general principles, the equipment should be started under the least restrictive conditions. That means opening all the reflux valves at levels one, two, and three fully; after normal startup, the pressure should be increased in the order of three, two, one. When stopping the machine, it should be done under the most favorable conditions (except in cases of emergency stop); by opening the return valves at levels one, two, and three in sequence to minimize the load, the machine can be stopped. For reference.