Regarding the issue of [reciprocating compressor ‘three-in-one’ pipeline, cooler], I hope Haiyou can provide assistance!

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This post was last edited by Erdo on 2012-3-12 at 17:54. Basic details: (hydrogen refining, new hydrogen compressor) 1. Reciprocating compressor; 2. Three-stage compression; 3. Working medium: hydrogen; 4. Inlet pressure at stage 1: 2.0 Mpa, exhaust pressure at stage 1: 4.2 Mpa, exhaust pressure at stage 2: 8.4 Mpa, exhaust pressure at stage 3: 12.4 Mpa; 5. Inlet and outlet temperatures at stage 1: 22°C and 95°C respectively, with cooling via the first heat exchanger； The secondary inlet and outlet temperatures are 32 and 105, respectively; it is cooled by a secondary heat exchanger ； Level 3 imports and exports: 34, 80. (Celsius) 6; at the third outlet, there is no heat exchanger for cooling, so the temperature is 80 degrees Celsius, and the fluid is sent directly to the compression section. Question: [I think that in a 3-stage to 1-stage system, there is no need for a heat exchanger for cooling.] In a 3-stage to 1-stage system, the flow rate output by the compressor is regulated, with the fluid from the third stage returning to the first stage inlet. The temperature of the hydrogen at the third-stage outlet is 80 degrees Celsius. I think in the case of a three-way one-stage system, the high pressure of 12.4 Mpa at the third-stage outlet is reduced to a low pressure of 2.0 Mpa. [Since the gas does work on its surroundings, its temperature should decrease; therefore, cooling isn’t necessary.] [During compression, the compressor does work on the gas, causing its temperature to rise.] ； When it’s at 3 rounds per minute, the high-pressure gas turns into low-pressure gas; as the gas exerts force outward, the pressure drops and the temperature should decrease as well. 【Just like in a carbon dioxide fire extinguisher, when high-pressure gas is released from the nozzle, the temperature should go down.] Based on my own understanding, there’s no mathematical formula involved in this phenomenon. I hope fellow users can explain it in simple terms. The question is in 【】.