METHOD OF DRYING HYDROCARBON GAS BY DIETHYLENE GLYCOL Russian patent published in 2017 - IPC B01D53/26 B01D53/14 B01D3/00 

FIELD: oil and gas industry.

SUBSTANCE: method for drying the hydrocarbon gas comprises preheating the gas and directing it to a three-sectional absorber, counter currently moving the diethylene glycol solution, purifying gas of suspended liquid droplets in the lower scrubbing section, absorbing water vapor by diethylene glycol while moving the gas through a tray system in the middle section and subsequently cleaning the gas of entrapped droplets of a solution of diethylene glycol in the upper scrubbing section, the removal of the dried gas from the absorber to the consumer and the subsequent regeneration of the used diethylene glycol solution. The process is carried out using a steam-jet refrigerating machine operating in the heat pump mode. Regeneration of the diethylene glycol solution is carried out in a desorber, consisting of a top tray type in which a solution of diethylene glycol downwardly evaporates moisture with a counterflow of acute water vapor and diethylene glycol vapor and a lower portion where the solution is heated by a boiler and the water evaporates, condensation water vapor withdrawn from the desorber in a condenser-cooler with the supply of the resulting water to the top of the stripper, the withdrawal of the regenerated hot solution of diethylene glycol from It part stripper and supplying it to the absorber gas drainage with a maximum recovery of heat for heating diethylene saturated solution fed for regeneration to the heat exchangers and a refrigerator. In this case, one part of the steam produced in the steam generator is sent to the desorber boiler with the return of the formed condensate to the steam generator, and the other part as the working steam is sent to the ejector nozzle, involving the ejected refrigerant vapor, which is water from the evaporator. Moreover, by recirculating the refrigerant through the cold receiver, "cold" water is produced, one stream of which is fed to a condenser-condenser to condense the water vapor withdrawn from the stripper and the second into the refrigerator. The mixture of refrigerant vapor and working steam, formed after the ejector, is sent to the condenser of the steam-jet heat pump, and the heat of condensation of the mixture of refrigerant vapor and working steam is used to produce "hot" water, which is heated by hydrocarbon gases in front of the absorber returning to the condenser of the steam-jet heat pump.

EFFECT: increasing of energy efficiency, improving the quality of gas drying, creating an environmentally friendly and explosive-fire-safe technology for dehydrating gas by preventing the release of spent coolants into the environment and avoiding the handling of explosive work environments.

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