Abstract: During the start-up process of the sulfur recovery unit,operators found rumbling noises inside the medium-pressure steam superheater and evaporator for incinerator and there was vibration on the platform railings of the equipment top. To find out the causes of the equipment vibration, the vibration data of the burner, tail gas incinerator, medium-pressure steam superheater, evaporator for incinerator, platform ladders, railings, top pipes, and silencers were measured at start-up. After analyzing the vibration of the medium-pressure steam superheater and the evaporator for incinerator, it was concluded that the excessive vibration of the silencers releasing steam was its main vibration source, and the vibration could be eliminated through technical renovation and the combustion could be optimized. Meanwhile, the secondary vibration sources could be eliminated.

Key words: tail gas burner, medium pressure steam superheater, incinerator evaporator, vibration