Why are there high-pressure and low-pressure gas storage cylinder sets after the compressor unit in CNG filling stations?
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Hello everyone, I have a question regarding CNG filling stations. According to the flow diagram of CNG filling stations, after coming out of the compression unit, there are high-pressure and medium-pressure gas storage cylinders; in some cases, there are even high-pressure, medium-pressure, and low-pressure gas storage cylinders. I have this question: isn’t the gas coming out of the compressor unit all at around 25 MPa? Why is there a distinction between high, medium, and low pressure? Why is it divided this way? Looking forward to everyone's answers!
I think it is to improve the volume utilization rate of the gas storage facilities and avoid continuously storing low-pressure gas at high pressure. In fact, the pressure inside all the well pipes should be the same in the end. Personal opinion; looking forward to experts
It is determined based on the CNG refueling process; the low, medium, and high orders are used to ensure safety
It’s a bit vague; can you put it in simpler terms?
The compressor does not operate continuously; the low pressure output by the compressor is connected to the direct charging line, and air is only supplied to the medium- and high-pressure gas cylinders when the pressure in those cylinders drops
Regardless of whether they are high, medium, or low pressure, the pressure for all bottle groups is 25 MPa. This classification is used because the sequence control panel requires a specific order for starting up devices, and the different sizes of these bottle groups help to distinguish them from one another.
A pipeline branch appears at the compressor outlet, and each branch is equipped with a pressure regulating valve to ensure that each branch operates under a gradient pressure.