国产DA-180-71型催化气体压缩机,原设计气体入口压力不大于0.5kg/cm~2,催化裂化实现提压操作后,入口压力升至1.0—1.2kg/cm~2,原来的抽气式密封机构已不能满足要求,因此开展了试装机械密封的工作。该气体压缩机由于速度很高,在密封付处的PV值将达6000大气压·米/秒以上,这样高的PV值,国产的机械密封是否适用尚未试验过。我们经模拟试验和现场试运,认为采用国产机械密封基本上可行,并已在 Domestic DA-180-71 catalytic gas compressor, the original design of gas inlet pressure is not greater than 0.5kg / cm ~ 2, catalytic cracking pressure to achieve operation, the inlet pressure rose to 1.0-1.2kg / cm ~ 2, the original pumping Gas sealing mechanism has been unable to meet the requirements, therefore carried out a trial installation of mechanical seal work. Due to the high speed of the gas compressor, the PV value at the sealing place will reach 6,000 atmospheres · m / s or above. Such a high PV value has not yet been tested whether the domestic mechanical seal is suitable or not. Our simulation test and on-site trial operation, that the use of domestic mechanical seal is basically feasible, and has been