Hydrate promoter, device and method for continuously separating carbon dioxide from flue gas

Abstract

The invention relates to a hydrate promoter, a device and a method for continuously separating carbon dioxide from flue gas. The hydrate promoter includes an aliphatic nitrogen-containing compound, a quaternary ammonium salt, a fluorocarbon surfactant and a carbonate ester compound. The device comprises a continuous CO2 absorption tower, a regeneration tower, and a cold/hot liquid heat exchanger. The method is characterized in that the hydrate promoter is processed to prepare an aqueous solution with the mass concentration of 1-15%, and CO2 is trapped under 0.1013-1.5 MPa at 0-15 DEG C; and CO2 removal is realized in the regeneration tower under 0.1013 MPa or less at 50-100 DEG C. The CO2 absorption tower allows the trapping rate of CO2 in stable continuous airflow to reach up to 85.8%, the continuous flow cold rich liquid sampling gas storage capacity to reach up to 334 mg/g and the purity of CO2 separated in the regeneration tower to reach up to 99.2%. The method is novel and simple, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a hydrate accelerator, a device and a method for continuously separating carbon dioxide in flue gas, in particular to a hydrate accelerator, a device and a method for continuously separating carbon dioxide in low-concentration industrial kiln flue gas. Background technique [0002] With the development of the economy, the greenhouse effect is becoming more and more serious, forcing more and more countries and international organizations to show great concern about CCS technology. my country is a big coal-burning country, to achieve CO 2 Emissions reduction targets, separation and capture of CO from industrial kiln flue gas emissions 2 Especially crucial. Traditional CO 2 Separation methods include cryogenic fractionation, chemical absorption, physical absorption and membrane separation. However, in industrial applications, these methods have disadvantages such as heavy pollution, high energy consumption, high cost, and smal...

AI Technical Summary

Problems solved by technology

However, this high-pressure, airtight and long-term hydration reaction requires large investment, high energy consumption, small processing capacity, and cannot be processed continuously.

[0008] CN103304479B discloses a CO 2 Hydrate accelerator, using dodecylbenzenesulfonic acid compound as hydrate accelerator, can greatly shorten CO 2 Hydrate induction period, that is, the crystal nucleus formation time, but the hydration accelerator solution in the high-pressure reactor, that is, the aqueous solution of the surface-active ionic liquid, must be vacuumed for 30 minutes, and then pressed into the pure CO 2 , and stirred with 500rpm magnetic force, after a long time, vacuum pretreatment, and then press into the pure CO at a high pressure of 3-5MPa 2 And high-speed stirring to shorten the induction period, for the CO in the continuous flue gas of industrial kiln 2 Capture missing applicability

However, there are still the following technical defects: (1) high-speed stirring in a magnetic stirrer at a speed of 400 to 500 rpm in an autoclave; (2) pure CO 2 Press in, and the specific operating pressure in the embodiment is 2.6MPa, 3.2MPa, 4.2MPa, the operating pressure is relativ

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