What is the internal relationship between pressure, flow rate, compression ratio, and temperature in a reciprocating compressor?

I’m not sure if the question you mentioned relates to design work or just general understanding. A series of questions are those you have assumed without further consideration; I recommend the book \"Principles of Chemical Engineering\", which should be helpful for addressing the issues you have raised regarding process principles. Piston compressors belong to the category of positive-displacement compressors. The entire compression process, as well as the compression process at each stage, depends on various factors such as the compression coefficient of the gas at a certain pressure, the conversion of thermal energy, the stroke of the piston, and the feasibility of mechanical construction. The best option is selected from among them to be designed,,,。 I’m from the counterfeit industry; generally speaking, it’s simple to understand, but the design details require careful consideration, and there are many aspects to take into account in terms of design. For reference only.

Learn about the gas state equation~

The load affects the current required for the compressor to operate; the greater the load, the more compression work is needed, and thus the higher the current in the motor.

The so-called load refers to the air intake volume of the compressor. In simple terms, it refers to the amount of gas that a compressor can compress. The load affects the current required for the compressor to operate; the greater the load, the more compression work is needed, and thus the higher the current in the motor. The pressure ratio and pressure are determined by both the organic component itself and the back pressure of the connected pipelines, and they generally do not change significantly under normal operating conditions. 10%, 50%, and 100% load all correspond to adjusted intake air volume.

The export pressure at various stages is determined by design and is mainly related to temperature (normally it is less than 160; special gases have different specifications). Generally, the pressure ratio between stages does not exceed 3 (not entirely certain). Load regulation affects flow rate; however, when the system’s demand remains constant, an increase in load leads to an increase in pressure, and vice versa. Thus, this affects both pressure and shaft power

The design institute reminds you: not many people really understand this. Answer one question at a time. The new hydrogen compressor in a certain unit is a reciprocating compressor with three stages of compression; so what determines the outlet pressure at each stage? The stage 1 suction pressure is determined by the pipeline network and the suction valve pressure loss. The inter-stage pressure is determined by the suction volume at the inlet of each stage. If you look at the data table, you’ll see that the ratio of the inhalation volume at each stage (the inlet condition at each stage) is the pressure ratio. What is the relationship between load and pressure? If the pressure ratio remains unchanged at 10% load, and the pressure stays constant, as well as at 50% or 100% load, then this load can be considered to be equivalent to flow rate. It seems that the amount of flow rate has no direct effect on the inlet and outlet pressures of the compressor, nor on the pressure ratio. So which parameters of the compressor are affected by this load? And what factors determine the pressure and pressure ratio? Is there anyone with experience in compressor design or operation who can offer some guidance? I don’t fully understand this aspect and it has been a source of confusion for me. Thank you for the criticism and suggestions. By pushing open the suction valve, the load control system with stepless flow regulation is unaffected by changes in the pressure between stages. All of your questions can be explained with one question. That is, given a compressor – for example, a three-stage compressor with inlet pressures of 2-4, 4-8, and 8-16 – if the inlet pressure becomes 1.5 while the outlet pressure or back pressure remains at 16, how does the pressure between the stages change? Once you understand this question, everything will become clear. If you have any other questions, feel free to message me privately.

Furthermore, all causes of pressure changes are due to changes in flow rate

I understand your question as follows: when the pressure at the inlet of stage 1 decreases, and given that Pv=mRT, then with the volume of the first-stage cylinder remaining constant, the mass flow rate of gas entering stage 1 will decrease; as a result, the pressure at the outlet of stage 1 will also decrease； The secondary inlet pressure, which is roughly equal to the primary outlet pressure, will also decrease. Analogous to the primary stage, the secondary exhaust pressure will as well decrease. The inlet pressure at the third stage will drop, while the outlet pressure at that stage remains unchanged; as a result, the pressure ratio for the third stage will change, and the exhaust temperature will rise. As for whether the pressure ratio at the 12th stage will increase or decrease, it’s not possible to determine based on these two variables.