Method for preventing reverse rotation of refrigeration compressor in cold storage

Method for preventing reverse rotation of refrigeration compressor in cold storage It is strictly forbidden to reverse after the refrigeration compressor of the cold store stops. When the compressor rotor is stationary, a large volume of process gas remains in the pipeline at this time, and has a certain pressure. At this time, the compressor rotor stops rotating, and the pressure in the compressor is lower than the pipeline pressure. At this time, if there is no check valve installed on the compressor outlet line or the check valve is far away from the compressor outlet, the gas in the pipeline will reverse flow, causing the compressor to reverse, and also driving the steam turbine or motor and gear transmission Wait for the rotor to reverse. The reverse rotation of the compressor rotor will destroy the normal lubrication of the bearings, change the thrust bearing stress conditions, and even cause the loss of the thrust bearings. The dry gas seal will also be damaged due to the reverse rotation of the compressor. In order to avoid compressor reverse rotation, several issues should be noted: 1. A check valve must be installed on the compressor outlet pipeline, and installed as close to the outlet flange as possible, so that the distance between the check valve and the compressor outlet is reduced as much as possible, so that the gas capacity in this section of pipeline is reduced Minimal, so as not to cause reversal. 2. According to the situation of each unit, install vent valves, exhaust valves or recirculation lines, and open these valves in time when shutting down to remove the high-pressure gas from the compressor outlet to reduce the volume of gas stored in the pipeline. 3. The gas in the system may be backfilled when the compressor is stopped. High pressure and high temperature gas backfilled into the compressor can not only cause the compressor to reverse, but also burn out the bearings and seals. Cold storage Since gas backflushing has caused many accidents in China, it is very worth noting! In order to prevent the occurrence of the above accidents, the following two tasks must be done before speed reduction and shutdown: 1. Open the vent valve or return valve to vent or return the gas. 2. Close the check valve of the system pipeline. After doing the above work, gradually reduce the speed and shut down. 4. Increase research work. Due to the reform of the current wall materials and the design of a huge number of mixed structures, there are many new issues to study in wide construction. The increasingly complex functions of high-rise buildings need to be constantly adjusted and supplemented. In addition, some new problems need to be studied.

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