Screw compressor for mixed refrigeration field and application method thereof

Abstract

The invention discloses a screw compressor for a mixed refrigeration field and an application method thereof. The screw compressor comprises a machine body; a cylinder, a piston, a connecting rod and a machine body compression chamber are mounted on the machine body; the connecting rod and the piston are tightly connected to the machine body; a volume adjusting electromagnetic valve, a machine oil filter, a position indicator, a mechanical compression chamber spraying port, a cleaning hole cover flange and an oil release valve are mounted in the machine body compression chamber; and a safety valve and a high-pressure side angle valve are mounted at the bottom end of the outer wall of the machine body. The application method is to firstly adjust the ratio of R22 mixed refrigerant and to control a control system and an oil return system of the screw compressor to achieve the effect of deep cooling. The screw compressor with high reliability, convenience to operate and maintain, good power balance and high adaptability is applied to a compression process of the R22 compression mixed refrigerant, so that the energy consumption is reduced, and the equipment investment cost is reduced.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of natural gas liquefaction, and in particular relates to a screw compressor used in the field of mixed refrigeration and an application method thereof. [0003] Background technique: [0004] Screw compressors are divided into single-screw compressors and twin-screw compressors. The commonly used screw compressor is an oil-filled screw compressor. When the compressed gas medium does not react with the lubricating oil and the lubricating oil can be mixed into the medium and can be separated well, the oil-injected screw machine is used, and the screw machine does not set synchronous gears. , The compressor cavity is connected with the lubricating oil system, and a swipe valve is usually set, which can not only adjust the exhaust pressure to adapt to various working conditions, but also greatly reduce energy consumption. The dry seal is used between the main engine and the main shaft, so that there is ...

AI Technical Summary

Problems solved by technology

[0005] At present, screw compressors in the prior art are mainly used in the following aspects: (1) Screw air compressors: mainly used in the field of aerodynamics, used to drive various pneumatic tools, due to the development of oil-gas separation and gas purification technology , and are increasingly used in applications that require very high air quality, such as: food, pharmaceuticals and cotton spinning industries, occupying many markets that originally belonged to oil-free air compressors; (2) screw process compressors : used to compress gases in various processes, such as: carbon dioxide, ethylene, methane, hydrogen, natural gas, torch gas, etc.; Transformed into process gas compression purposes, this type of model is often low in cost, but has relatively large limitations, and can only be used for a certain type of gas

However, centrifugal compressors or reciprocating compressors are mostly used in the cryogenic field in the refrigeration industry. Among them, the centrifugal compressor has a long history and is currently the most widely used refrigeration compressor in China. Its advantage is that it has a wide pressure range. , can adapt to a wide range of energy, high speed, multi-cylinder, adjustable energy, high thermal efficiency, suitable for a variety of working conditions, etc.; its disadvantages are complex structure, many wearing parts, short maintenance cycle, sensitive to wet stroke, There are pulse vibrations and poor running stability; compared with centrifugal compressors, reciprocating compressors have high speed, large gas volume, small mechanical wear, few wearing parts, simple maintenance, long continuous working time, small vibration, and stable operation. It has low requirements on the foundation. When the volume is large, the unit power unit is light in weight, small in size, and occupies a small area. The gas volume can be adjusted steplessly within the range of 30% to 100%. It is easy to realize automation according to the requirements of some chemical processes. For large-scale machines, it can be directly driven by industrial steam turbines with high economical efficiency, which has economic advantages for enterprises with waste heat steam.

Its disadvantages are: high noise frequency, large consumption of cooling water, surge will occur when improper operation

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