Molecular sieve poisoning in nitrogen generator
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The facility is currently equipped with a nitrogen production system that generates 400 NM3/h of nitrogen gas, along with a refrigerated dryer capable of producing 27 NM3/h, and an air compressor with a capacity of 160 KW and a flow rate of 27.6 M3/h. The process is air compressor → oil-water filter → refrigerated dryer → oil-water filter → air buffer tank → nitrogen production adsorption tower → nitrogen buffer tank → end user. Half a month ago, water was found in the silencer; water was also present after opening the switch valve of the adsorption tower. There was no water in the air buffer tank, and there was no obvious freezing in the pipes at the inlet and outlet of the cold dryer. The purity of nitrogen isn’t increasing; under zero-flow conditions, it reaches a maximum of 91%. I hope fellow users can help analyze this issue. Thank you.
Is the water drainage of the air compressor and refrigerated dryer functioning properly? ~~Front-end water separation is very important; otherwise, free water will be carried into the adsorber. Additionally, does your air buffer tank have a gas-liquid separation function? ~~
If the analyzer is accurate, the carbon molecular sieve has been poisoned by oil. Reasons for analysis and recommendations: 1. Check whether the air compressor oil filter separation system is functioning properly； 2. If there is water at the back of the cold dryer, it indicates that the unit has not been functioning properly for some time; check whether the cold dryer can still operate, and if not, replace it ； 3. Water appears at the back end; all filter elements must be replaced after a large amount of oil and water have passed through them ； 4: Considering a cold dryer with a capacity of 400 NM3/H and a volume of 27 cubic meters, it is likely that a device with 295 purity should be used; the amount of molecular sieve required is 1.8–2 tons. By using the latest type of molecular sieve, the flow rate of the device could reach 500 NM3/H.