How to achieve changes in the inlet pressure of a reciprocating compressor
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I would like to ask: In a reciprocating compressor, if the inlet pressure keeps changing while the outlet pressure remains constant – for example, if the inlet pressure drops from 20 MPa to 3 MPa while the outlet pressure stays at 20 MPa – meaning that the compression ratio is constantly changing – how is this achieved technically?
The outlet pressure of a compressor is generally fixed – it depends on the design of the compressor itself. There is also a specified value for the inlet pressure. The pressure changes you’re referring to are likely those in the process side before the compressor enters; the compressor has its own mechanisms for load regulation~~
The original poster’s question is quite challenging. Please provide detailed information about your process, the equipment you use, and why such requirements were set I believe that as long as you can afford the price, there will be a manufacturer willing to produce this machine for you
By adjusting the opening degree of the control valve that allows flow back from the compressor outlet to the inlet, or by using the previous stepless air volume control, it is possible to regulate the amount of flow returning from the outlet
Reply to 4# yulanggongwu: You are referring to adjusting the exhaust volume, right? From the perspective of pressure adjustment, what measures can be taken to achieve this?
Reply to 3# niumowang: It is indeed possible to create such machines; there are manufacturers that can produce them, and they are also used in practice. For example, the reciprocating compressors used in CNG filling stations can handle such operating conditions. I just want to understand how such compressors are structured from a technical standpoint, as the pressure ratio keeps changing
Reply to 2# zht1986429: How can we understand self-load regulation?
Generally, the inlet pressure is provided by the previous process; the equipment itself cannot adjust its operation by keeping the outlet pressure constant while varying the inlet pressure, as mentioned by the original poster. Of course, if the pressure from the previous process exceeds the pressure required by the equipment, it is possible to install a control valve before the equipment to regulate the inlet pressure. The adjustment of the circuit or final circuit of the equipment itself has an impact on the outlet pressure, with only differences in the magnitude of those fluctuations.
Reply to 6# xydsjd: I have worked with them before; membrane compressors can achieve this. Hehe, looking forward to it with you too
Generally speaking, the function of a compressor is to supply the required medium, as well as to regulate and stabilize a certain parameter, rather than changing that parameter
Reply to 7# xydsjd: Things like return circuits, for example~ or air valves used to regulate the amount of air intake~~ If there are any mistakes, please point them out!