In-situ circulating hydrate promoter capable of continuously separating carbon dioxide, apparatus and method thereof

Abstract

The invention relates to an in-situ circulating hydrate promoter capable of continuously separating carbon dioxide, an apparatus and a method thereof. The hydrate promoter comprises a heterocyclic compound, quaternary ammonium salt, an organosilicon surfactant and a carbonic ester compound. The apparatus is a twin-tower or multi-tower cycle trapping tower having a same structure; the trapping comprises a gas inlet / distribution and liquid discharge device, a cold / heat exchange device, a screen mesh large space trapping-releasing bed, an atomization spray apparatus, and a liquid-gas separating apparatus which are arranged from lower to upper, and a N2 and CO2-riched discharge pipeline and a warm-pressing induction apparatus are arranged at the top of the trapping tower. The method comprises the following steps: preparing a promoter to an aqueous solution; under conditions of 0.1013-1.0 MPa and the temperature of 0-20 DEG C, trapping CO2; and under conditions of less than 0.1013 MPa and the temperature of 50-100 DEG C, removing CO2. The trapping rate of the CO2 can reach as high as 91.3%, the separated CO2 purity can reach as high as 98.7%; the method is novel and simple, and is adapted to industrial production.

Description

technical field [0001] The invention relates to an in-situ circulating hydrate accelerator, device and method for continuous separation of carbon dioxide, in particular to an in-situ circulating hydrate accelerator, device and method suitable for continuous separation of carbon dioxide from large-flow flue gas in industrial kilns. 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 ...

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 relatively high

However, this hydrate method still needs to react for several hours in a closed autoclave at a high pressure of 1.5-4 MPa (15-40 atmospheres), and its disadvantages are: 1) The reaction time for hydrate formation is still too long; 2 ) also needs to carry out hydration reaction under electromagnetic stirring in a closed high-pressure container, which cannot continuously absorb CO in the flue gas flow. 2 ;3) The pressure is still too high, and the compression energy consumption is too large

However, these methods are still in the laboratory stage, with large investment, high energy consumption and poor stability

[0014] On the other hand, due to the existing hydrate method for low-concentration flue gas (general industrial kiln flue gas) or IGCC syngas separation and capture of CO 2 Therefore, the implementation processes of the hydrate method proposed by those skilled in the art are all hydrate method combined with other methods, such as the combined process of hydrate method combined with membrane separation method, hydrate method combined with chemical adsorption method, which makes the process Complexity, large investment, high energy consumption, high operating costs

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