Introduction
Molecular sieve natural gas sweetening equipment (desulfurization) skid, also called molecular sieve sulfide removal from natural gas , is a key device in H2S removal from natural gas and natural gas treatment.Process flow
The unit adopts three tower process, one tower adsorption, one tower regeneration and one tower cooling. After removing the entrained hydrocarbon liquid through the feed gas filter separator, the feed gas enters the molecular sieve desulfurization tower. The water and mercaptan in the feed gas are adsorbed by the molecular sieve to realize the dehydration and mercaptan adsorption process. The purified gas from dehydration and mercaptan removal enters the product gas dust filter to remove the molecular sieve dust, and then it is exported as the product gas. Molecular sieves need to be regenerated after adsorbing a certain amount of water and mercaptan. After filtering the product gas dust, a part of the product gas is extracted as regeneration gas. After the gas is heated to 300 ℃ by the heating furnace, the tower is gradually heated to 272 ℃ through the molecular sieve desulfurization tower which has completed the adsorption process from bottom to top, so that the water and mercaptan adsorbed on the molecular sieve can be separated out and become rich regeneration gas to complete the regeneration process. After the regeneration tower, the rich regeneration gas enters the regeneration gas condenser and cools to about 50 ℃, so that most of the water is cooled, and then separated by the separator, and the separated rich regeneration gas is burned. The molecular sieve tower needs to be cooled after regeneration. In order to fully recover and utilize the heat energy, the regeneration gas is first used as cold blowing gas, and the tower is cooled to about 50 ℃ from top to bottom through the molecular sieve desulfurization tower which has completed the regeneration process. At the same time, it is preheated by itself. The cold blowing gas is sent out of the cooling tower and then fed into the regeneration gas heating furnace for heating. After heating, the molecular sieve desulfurization tower is regenerated as lean regeneration gas. The device switches every 8 hours.
