Multi-tower series-connected circulating amine solution regenerating device

Abstract

The invention relates to equipment for purifying gas by using an alcohol amine solution, and in particular relates to a multi-tower series-connected circulating amine solution regenerating device. The multi-tower series-connected circulating amine solution regenerating device is characterized by comprising a regenerating tower group which is formed by connecting at least two regenerating towers together, and a rich-poor solution heat exchanger (1), wherein an amine-rich solution inlet, an amine-rich solution outlet, an amine-poor solution outlet and an amine-poor solution inlet are formed in the rich-poor solution heat exchanger (1) respectively; the amine-rich solution outlet is communicated with an amine solution inlet in the top of the first regenerating tower in the regenerating tower group through a pipeline; the amine-poor solution inlet is communicated with an amine solution outlet in the bottom of the last regenerating tower in the regenerating tower group through a pipeline. According to the device, a multi-tower series-connected structure is adopted, so that the heights of the regenerating towers are effectively reduced, and requirements for mounting the regenerating towers are effectively reduced. The device is structurally integral, and modular; conditions are provided for implementation of the miniaturization and blocking of the device; the device is simple in process, and the number of equipment is small; acidic gas in an amine solution is thoroughly analyzed; the amine solution is stable in circulation, and the device can work under the normal pressure.

Description

technical field [0001] The invention relates to equipment for gas purification using alcohol amine solution, in particular to a multi-tower series-parallel circulation amine liquid absorption device. Background technique [0002] At present, industrial tail gases such as natural gas, refinery gas, synthetic gas, coal gas and synthetic ammonia contain varying amounts of acid gases (hydrogen sulfide, carbon dioxide, etc.), and these useless gases need to be removed in actual production. The industry usually adopts the recycling method of alcohol amine solution to purify this kind of gas. The gas passes through the mass transfer between the solution and reacts with the solution so that the acid gas is absorbed into the solution and carried into the regeneration system of the solution to convert the solution The acid gas absorbed in the solution is decomposed and discharged, so as to realize the regeneration and recycling of the solution. [0003] Generally, the regeneration of...

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Problems solved by technology

[0003] Generally, the regeneration of amine liquid is carried out in the regeneration tower. The acid gas is decomposed by heating the amine liquid. However, the height of the regeneration tower is usually high, and the general installation requires on-site assembly, which is not conducive to miniaturization and rapid operation.

Especially with the development of the liquefied natural gas industry in recent years, small gas sources such as associated gas in various oil fields, small gas wells, and remote gas wells have high mining costs due to scattered reserves, and high production costs due to long-distance pipeline transportation. For this reason, the natural gas in my country's scattered gas fields and remote gas fields has not been developed for a long time

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