After replacing the molecular sieve, the dehydration effect of natural gas is very poor
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Our plant recently switched to natural gas after replacing the molecular sieve. The dehydration effect is very poor; the dew point is only around -60, which severely affects production. Three-tower dehydration ( Towers A and B for adsorption, Tower C as a regeneration gas drying tower); the molecular sieves used are 13X and 3A. The upper sections of Towers A and B contain 3A molecular sieve, while the lower sections contain 13X molecular sieve. Tower C is entirely made of 3A molecular sieve. Currently, towers A and B are being heated to 200 degrees and moisture is still coming out; I’m not sure what the reason is. I would appreciate it if a master could analyze this and offer some guidance
Is the regeneration treatment of the molecular sieve appropriate after replacing it? Has water gotten into the tower? For 13X and 3A treatments, the temperature should reach 300 degrees. It’s not entirely clear how it should be designed and operated.