LNG to lL/CNG
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1. CNG vehicle refueling process: LNG storage tank—plunger pump—high-pressure air-temperature vaporizer—sequence control panel—gas storage cylinder set—refueling unit—CNG on-board cylinder. Why is it LNG storage tank—high-pressure air-temperature vaporizer—plunger pump—sequence control panel—gas storage cylinder set—refueling unit—CNG on-board cylinder? 2. The cryogenic liquid is forced into a high-pressure air-cooled vaporizer at a pressure of 25 MPa; after vaporization, it passes through a sequence control panel. Could someone please explain in detail what happens after that? Thank you. (Sequence control panel for collision sequence and pressure point control)
1. Why is a sequence control panel needed? Is it because it’s in the Gas Engineering Design Manual? Is it because the manufacturer wants to boost sales? Is it because even the designers can’t explain the reason? I hope the original poster will do more research. 2. Personal opinion: In the case of conventional CNG filling stations, where the gas storage capacity is large but the compressor’s displacement is limited, a sequence control panel is essential; otherwise, the filling time may become very long. According to the \"Gas Engineering Design Manual,\" energy savings are achieved through the use of CD systems. For the sequence control panel of L-CNG refueling stations, it’s sufficient to treat it as having 3 check valves; there’s no need for anything more. With the limited power of L-CNG, running the engine a few more times doesn’t have much impact; there’s a stable gas supply of 25MPA available. A Q-type sequence control panel isn’t necessary – direct charging is sufficient. 3. I forgot to ask – a gas station station has 2 sets of sequence control panel \"mechanisms\". Which set are you referring to? 4. Everything I have said above is true; it may differ from what is stated in textbooks, as well as from the opinions of certain manufacturers and design experts, but please do not doubt it. The original poster can study it carefully!
Let’s reply to the question more carefully: 1) High pressure first, then medium pressure, and finally low pressure. 2) 8MPA, 14MPA, 21MPA
6MPA 13PMA 20PMA?
On 6-13-20, CNG vehicles were often filled to only 18–19 bars of pressure. Everyone knows that the standard maximum pressure tolerance for CNG cylinders is 20 bars; therefore, refilling begins only when the pressure reaches 20 bars. In reality, there is a delay between when refilling starts and when the desired pressure is achieved, so it’s necessary to plan ahead. Otherwise, for a while, the vehicles that arrived could only be filled to 18–19 bars of pressure. Of course, you can add a direct charger to fully charge it as well. It is recommended to top up the high voltage at least when it reaches 20.5. In fact, there’s no need to adjust the settings with such precision; low, medium, and high settings are all available. It’s best to make adjustments based on the actual operational data of the site, as this is largely related to local drivers’ habits regarding refueling and the distance to gas stations.