According to the characteristics of compressor rotor damage, this paper analyzes the impact of operating pressure and temperature fluctuation on the safe operation of screw compressor, and finds reasonable and effective preventive measures and treatment methods. Characteristics of accident phenomenon and screw damage (1) Gluing phenomenon occurs in the mating surface of the convex-concave rotor, there is obvious extrusion mark, and a sheet-like peeling layer appears on the working surface of the rotor; (2) The top sealing line of the convex-concave rotor is seriously damaged, and the discharge section of the rotor Damage to the seal line is more serious than damage to the suction section; (3) The compressor block is severely worn at the exit section. The twin-screw compressor is driven by a motor and is output at two speeds by a speed increaser to drive two compressors. The main engine and the compressor are arranged in a font.
A twin-screw compressor produces a volume change caused by the relative motion of a pair of rotors to compress the delivered gas. The compressed gas always has a tendency to vent to the low pressure position, and the tendency to vent is stronger as the pressure increases. The reciprocating compressor relies on the piston ring to seal the high and low pressure zones. Screw compressors (dry machines) use gap seals to minimize the gap between the rotors and between the rotor and the casing to prevent backflow of high pressure media. In order to reduce the return loss, the smaller the gap between the parts, the higher the compressor working efficiency is in ensuring normal operation. The small clearance is a major feature of the screw compressor, but it is also a hidden danger of accidents. Therefore, the motion accuracy of a pair of conjugate rotors is required to be high.
Due to the high speed, the movement accuracy of the rotor must be guaranteed during the movement. In the production process, the working state of the equipment is greatly affected by the changes in the production process conditions. Especially when the production fluctuates, the suction pressure rises and the pressure at the end of the compression of the stage compressor rises rapidly, so that the rotor loses its rigidity and elastically bends.