The adjustment of the compression ratio of a returner (reciprocating compressor) is a process involving many factors. Compression ratio refers to the ratio of the compressor outlet pressure to the inlet pressure, and its size directly affects the performance and efficiency of the compressor. The following are some ways to adjust the compression ratio of the refeeder:

　　First, adjust the speed

　　Principle: The compression ratio of reciprocating compressor has a certain relationship with the speed. The higher the speed, the greater the compression ratio.

　　The compression ratio is changed by adjusting the speed of the compressor. The compression ratio can be improved by turning the speed higher, and the compression ratio can be reduced by turning the speed lower.

　　Second, change the gas inlet and outlet pressure

　　Principle: The compression ratio is the ratio of the outlet pressure to the inlet pressure, so changing these two pressure values can directly affect the compression ratio.

　　How:

　　Increasing the pressure of the inlet gas or decreasing the pressure of the outlet gas can increase the compression ratio.

　　Conversely, reducing the pressure of the inlet gas or increasing the pressure of the outlet gas can be compressed.

　　It should be noted that changing the gas pressure needs to be carried out under the premise of ensuring the normal operation of the compressor, so as not to cause other problems.

　　reciprocator

　　Three, the use of throttling device

　　Principle: A throttling device is installed at the inlet or outlet of the compressor to improve the flow rate and compression ratio of the gas by reducing the airflow section.

　　Methods: According to the actual need to adjust the flow control of the throttle device to achieve the required compression ratio. This approach needs to be flexibly adapted to the actual situation.

　　4, adjust the inter-stage pressure (for multistage compressor)

　　Principle: In multistage compressors, the pressure difference between the various levels will also affect the overall compression ratio.

　　How:

　　The interstage compression ratio can be adjusted by the outlet pressure of this stage (i.e. the inlet pressure of the next stage) or by increasing the inlet pressure of this stage (i.e. the outlet pressure of the upper stage).

　　This requires a return control valve and stepless adjustment function between stages to achieve.

　　5. Consider other factors

　　Compressor design: compressor design compression ratio is the compression ratio at work, under normal circumstances can not be greater than this value.

　　System resistance: The compression ratio of the compressor is related to the process system, and the change of the system resistance will also affect the compression ratio.

　　Adjustment purpose: Before adjusting the compression ratio, it is necessary to clarify the purpose of adjustment, because changing the compression ratio may bring other problems, such as increasing the exhaust temperature and decreasing the work efficiency of the compressor.

　　Sum up

　　Adjusting the compression ratio of reciprocating compressor is a comprehensive process, and it is necessary to choose the appropriate adjustment method according to the actual situation. In the adjustment process, it is necessary to consider the design parameters, operating conditions and system requirements of the compressor to ensure that the adjustment is better. At the same time, it is also necessary to pay attention to avoid equipment failures or accidents.