Common faults and solutions for Freon economizer screw refrigeration compressors
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Common Faults and Solutions for Freon Economizer Screw Refrigeration Compressor Units: Abstract: In actual operation, Freon economizer screw refrigeration compressor units may experience problems such as the compressor failing to start properly, excessive vibration, abnormal noises, insufficient cooling capacity, failure of the compressor’s energy regulation and volume ratio control mechanisms, leakage at the compressor shaft seals, excessively high exhaust temperature, high condensing pressure, and faults in the oil circuit system. Analyze these faults and provide simple solutions. Screw refrigeration compressors feature a simple structure, easy operation, convenient replacement of wear parts and accessories, as well as safe and reliable performance, which is why they are widely used in fields such as refrigeration, freezing, air conditioning, the chemical industry, and light industry. In 2004, the Linear Workshop of the Plastic Plant at Daqing Petrochemical Company installed a W-FJYCLGF300ⅡD Freon economizer screw compressor unit. Some problems were encountered during its operation, and below I share my insights regarding the common faults that occur during the use of such Freon economizer screw compressor units and how to deal with them. 1 Overview of the W-FJYCLGF300ⅡD compression unit 1.1 Composition of the compression unit The unit is primarily composed of an LG16ⅡF type screw refrigeration compressor, a main motor, an oil circuit system, a process system, and a control system. The oil circuit system is equipped with an oil separator, an oil cooler, a coarse oil filter, an oil pump, and a fine oil filter ； The process system mainly consists of an evaporator, a condenser, an economizer, a suction filter, and check valves for suction and exhaust ； The control system consists of an instrument panel and a starting cabinet. 1.2 Technical parameters of main equipment The model of the screw-type refrigeration compressor is LG16ⅡF ； Nominal rotor diameter: 160mm ； Rotor length 240mm ； Theoretical exhaust volume: 552 m3/h ； Motor power: 110 kw ； Internal pressure ratio adjustment range: 2.5–5.0, stepless adjustment ； Actual cooling capacity adjustment range: 15～100% stepless adjustment ； Evaporator heat exchange area: 24.4 m2 ； The heat exchange area of the condenser is 14.0 m2. 1.3 Process control parameters Inlet pressure > 0.02 MPa ； Exhaust pressure
Why aren’t water coolers used in some models?
This depends on the water quality conditions and the type of condenser chosen. In areas where the water quality is poor or where there is a shortage of water supply, evaporation cooling or air cooling is used; in such cases, it is not possible to employ water-cooling or oil-cooling methods. Therefore, oil cooling using a working fluid is chosen, and this type of oil cooling generally does not pose any corrosion problems. The only requirement is that the liquid storage tank or auxiliary liquid storage tank be placed at a sufficient height.
Why is the oil level in the oil-gas separator of the large cooling unit always unstable, causing frequent alarms and shutdowns? Is it a design issue or a difference between horizontal and vertical types?