Amine solution regeneration system and amine solution regeneration process applied to floating liquefied natural gas facility

Abstract

The invention relates to an amine solution regeneration system and an amine solution regeneration process applied to a floating liquefied natural gas facility. The system comprises an amine solution absorbing tower, wherein a top outlet of the amine solution absorbing tower is connected with a heat flow inlet of a treatment gas heat exchanger; a heat flow outlet of the treatment gas heat exchangeris connected with an inlet of a treatment gas buffer tank; a bottom liquid outlet of the treatment gas buffer tank is jointed with a bottom outlet of the amine solution absorbing tower and then is connected to a cold flow inlet of a waste heat use exchanger; a cold flow outlet of the waste heat use exchanger is connected with an inlet of an amine solution flash distillation column; a cold flow outlet of a poor / rich amine solution heat exchanger is connected with an inlet of an amine solution regeneration tower; a top outlet of the amine solution regeneration tower is connected with a heat flow inlet of the waste heat use exchanger; a heat flow outlet of the waste heat use exchanger is connected with a heat flow inlet of a regeneration tower top condenser; a heat flow outlet of the regeneration tower top condenser is connected with an inlet of a regeneration tower reflow tank; a bottom liquid outlet of the regeneration tower reflow tank is connected with an inlet of the amine solutionregeneration tower through a reflux pump.

Description

technical field [0001] The invention relates to an amine liquid regeneration system and process applied to floating liquefied natural gas facilities. Background technique [0002] In the natural gas purification process of FLNG (floating liquefied natural gas facility), the raw material gas is usually deacidified by amine deacidification in the chemical absorption method, that is, the weakly alkaline amine liquid and the acid gas in natural gas (mainly h 2 S and CO 2 ) react to form compounds. Then, when the temperature of the rich amine liquid absorbed by the acid gas increases and the pressure decreases, the compound decomposes to release the acid gas, and the rich amine liquid is regenerated into a lean amine liquid. [0003] The amine liquid regeneration tower uses the rising hot gas heated by the reboiler at the bottom of the tower to heat the rich amine liquid entering the regeneration tower from the top of the tower, so that the compound decomposes to release acid ...

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Problems solved by technology

A large amount of heat is taken away by seawater. On the one hand, there is a large amount of latent heat that cannot be effectively used, and on the other hand, it is not conducive to the environmental protection of seawater. Therefore, it is necessary to use this part of heat

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