Gas-phase concentration type triethylene glycol dehydration regeneration system

Abstract

The invention discloses a gas-phase concentration type triethylene glycol dehydration regeneration system which comprises an absorption tower, a rectifying column, a flash tank, a rich-lean solution heat exchanger, a lean solution buffer tank, a regeneration tower, a reboiler, a circulating pump and a gas lean solution heat exchanger, wherein the absorption tower, the rectifying column, the flash tank, the rich-lean solution heat exchanger, the reboiler, the lean solution buffer tank, the circulating pump and the gas lean solution heat exchanger are sequentially connected through a pipeline to form a closed circulating loop. A condenser is arranged in the lean solution buffer tank; a cold source inlet, a cold source outlet, a hot source inlet and a condensate outlet are formed in the condenser; the hot source inlet is communicated with the inside of the lean solution buffer tank; the cold source inlet is communicated with a first pipeline through a second pipeline; and the cold source outlet is communicated with the first pipeline through a third pipeline. The system disclosed by the invention has the following beneficial effects: a condensation sleeve reduces the moisture partial pressure in the lean solution gas phase, so that the water content in the lean solution and the water content in the lean triethylene glycol are reduced, the concentration of the triethylene glycol solution is increased, and the energy consumption of flash evaporation is also reduced.

Description

technical field [0001] The invention relates to the technical field of gas dehydration process equipment for oil and gas field natural gas, associated gas, shale gas, coal bed methane, and coal-based natural gas SNG, and in particular to a gas-phase enrichment type triethylene glycol dehydration regeneration system. Background technique [0002] The triethylene glycol (TEG) dehydration process belongs to the solvent absorption method. According to the different solubility of natural gas and water in triethylene glycol, the triethylene glycol lean liquid is used to absorb the moisture in the natural gas, so that the wet natural gas can get rid of water vapor, so as to achieve the purpose of drying the natural gas; Utilizing the difference between the boiling points of triethylene glycol and water, the water absorbed in the triethylene glycol rich solution is evaporated by heating at normal pressure to obtain regenerated triethylene glycol (lean solution) for recycling. [000...

AI Technical Summary

Problems solved by technology

However, the use of dehydrated natural gas as the stripping gas results in a large amount of natural gas in the regeneration gas, which cannot be used as fuel because of the large amount of water vapor in the regeneration gas, which cannot be ignited. Low-pressure discharge system, difficult to recycle, direct discharge does not meet the current environmental protection and safety requirements

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