Liquid level in the fourth separation tank of the natural gas hydrogen production plant
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The liquid level in the fourth separation tank of the hydrogen production unit is used as a trigger for interlocks; when the level exceeds 80%, the system enters safety mode. Under normal conditions, the level gauge does not show any level reading, but upon on-site inspection it was found that there was a large amount of water. When this was reported to the instrumentation team, they said everything was normal. What could be the problem?
What is the fourth liquid separation tank in a natural gas-based hydrogen production plant? Which position? What gases and what liquids are separated? It also needs to be chain-linked……
During normal and stable production, the inlet temperature of the quadruplet tank is around 40 degrees, and there should be very little water. If a level interlock is added, it should work. But I’m not sure if your interlock system is a three-out-of-two type? If it’s not a two-out-of-three system, wouldn’t a malfunction in the liquid level display lead to an automatic shutdown?
Reply to 2# cook_cool: It is the separation of water and medium-pressure gas; the medium-pressure gas mainly consists of hydrogen. The chain mechanism is used to prevent this medium-pressure gas from entering the PSA at night, as this could lead to a decrease in the adsorbent’s capacity, reduced strength, and pulverization of the adsorbent
The level gauge does not indicate the actual liquid level, but there is a lot of water on site, which shows that water has indeed been brought in. Cause analysis: 1. There may not be enough water; is the pressure lead of the level gauge located at the bottom of the tank? If it’s not at the bottom, the water inside is the water at the bottom of the tank, and it has not reached the position of the pressure transducer corresponding to the liquid level. 2. The level gauge is malfunctioning. I wonder what type of level gauge you are using? The level gauge for the float? Is it because the float inside has leaked and can no longer float? Remove the level gauge and shake the float inside to check if there is water in it Our float has leaks at point 3; are there any glass plate level gauges on site? If so, check the actual liquid level against the reading shown by the level gauge to identify any issues. 4. Is there a problem with the water-to-carbon ratio flow meter? The actual amount of steam used is indeed high, which results in an excess of water in the downstream system. 5. Is there a place where steam can be supplied to the medium-pressure reactor? If so, is it here that too much steam is being supplied? 6. Does the PSA unit have an inlet buffer tank? If it does, there’s no need for excessive concern; simply implement interlock shutdown procedures. Pay close attention to the liquid level in the medium-pressure separator and strengthen the liquid removal process from the inlet buffer tank, checking it every 2 hours. Summarize the patterns over a period of time.