Abstract:

Cryogenic methane pump is the key equipment of cryogenic separation technology for ethylene plant. According to the original process technology patent provider, the medium transported by the pump has the process characteristics of light medium, low temperature, inflammable and explosive, so the sealing form of pressure seal tank structure with methanol as the sealing medium was selected. Since the pump was put into operation, the seal had failed frequently, resulting in the frozen blockage of methanol and the serious loss of ethylene in cold box. During the upgrading of the plant, the pump was replaced by permanent magnet canned motor pump to effectively solve the frequent leakage problem in the mechanical seal of cryogenic methane pump and achieve the goal of zero ethylene loss in cryogenic separation area of ethylene plant.

Key words: ethylene plant, methane pump, permanent magnet canned motor pump, cryogenic