CN114159950A - Flue gas desulfurization and decarburization coupled treatment system and method - Google Patents

Flue gas desulfurization and decarburization coupled treatment system and method Download PDF

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CN114159950A
CN114159950A CN202111430811.1A CN202111430811A CN114159950A CN 114159950 A CN114159950 A CN 114159950A CN 202111430811 A CN202111430811 A CN 202111430811A CN 114159950 A CN114159950 A CN 114159950A
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decarburization
desulfurization
flue gas
decarbonizer
area
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刘怀平
宋正华
周玲霞
许琦
宋夫交
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Kunyue Internet Environmental Technology Jiangsu Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/73—After-treatment of removed components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/606—Carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/80—Organic bases or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

Abstract

The invention discloses a flue gas desulfurization and decarburization coupled treatment system and method, wherein the process system comprises an absorption tower (1), a decarbonizer regeneration tower (2), a hydrocyclone separator (3), a filter (4), a centrifuge (5), a desulfurizer cooler (6), a decarbonizer lean and rich solution heat exchanger (7), a decarbonizer cooler (8) and a CO2Purification apparatus (9) The flue gas desulfurization and decarburization coupled treatment system and method have the following advantages: (1) SO is respectively finished in different areas of the same absorption tower2Absorption and CO2Absorption, realizing the coupling of flue gas desulfurization and decarburization; (2) the original wet flue gas desulfurization system is transformed into a desulfurization and decarburization coupled process system, so that the equipment investment cost can be reduced on the basis of realizing desulfurization and decarburization of flue gas simultaneously; (3) the coupling process system for desulfurization and decarburization has small occupied area, simple and convenient operation and the like.

Description

Flue gas desulfurization and decarburization coupled treatment system and method
Technical Field
The invention belongs to the technical field of atmospheric pollution cooperative control, and particularly relates to a flue gas desulfurization and decarburization coupled treatment system and method.
Background
At present, the coal-fired flue gas basically realizes treatment such as desulfurization, denitration and dust removal, and the most typical treatment process combination is 'Selective Catalytic Reduction (SCR) denitration + electrostatic dust removal + wet desulphurization'. Although atmospheric control achieves a staged result, the situation of air pollution in China is still severe.
The wet flue gas desulfurization technique is the mainstream SO2The control technology is that limestone/lime wet desulphurization accounts for nearly 80% of a plurality of wet desulphurization technologies, has the advantages of high desulphurization efficiency, mature technology, reliable operation and the like, and is widely applied to flue gas desulphurization of large-unit thermal power plants. The flue gas after desulfurization contains N in addition to2、O2、H2O, trace SO2And NOxBesides, it also contains 12-15% of CO2Having CO2The partial pressure is lower, the smoke components are complex, and the like, thereby increasing the difficulty for implementing the carbon capture of the smoke. The carbon capture technology comprises a physical absorption method, a chemical absorption method, an adsorption method, a membrane separation method, a low-temperature distillation method and the like, wherein the chemical absorption method has the characteristics of high efficiency, mature technology and low cost, and is the flue gas carbon capture technology which is most expected to be industrially popularized. In CO2Among chemical absorbents, alcohol amine absorbents such as ethanolamine (MEA) and hydroxyethylethylenediamine (AEEA) have been studied by many researchers and are widely used in carbon capture demonstration engineering projects on a global scale.
In summary, SO2And CO2The molecules are all acid gases, and can be removed by adopting an absorption methodThe main equipment of the system is an absorption tower, and the absorbent can be alkaline solution, such as limestone/lime slurry and alcohol amine solution. The increase decarbonization system will bring huge equipment investment cost behind the flue gas desulfurization system, if reform transform into the coupling process system of desulfurization and decarbonization with former desulfurization system, then can be on the basis of realizing the desulfurization decarbonization of flue gas simultaneously, reduce investment cost.
Disclosure of Invention
The invention aims to provide a flue gas desulfurization and decarburization coupled treatment system and method, so as to realize simultaneous desulfurization and decarburization in one device. The invention also aims to reduce the equipment investment cost while realizing decarburization by utilizing the improvement of the original desulfurization system. Therefore, the technical scheme adopted by the invention is as follows:
a flue gas desulfurization and decarburization coupled treatment system comprises an absorption tower (1), a decarburization agent regeneration tower (2), a hydrocyclone separator (3), a filter (4), a centrifuge (5), a desulfurizer cooler (6), a decarburization agent lean and rich liquid heat exchanger (7), a decarburization agent cooler (8) and CO2The device comprises a purification device (9), the interior of an absorption tower (1) is sequentially divided into a desulfurization area (A), a decarburization area (B) and a tail gas washing area (C) from bottom to top, the top of a desulfurizer circulating groove (A3) at the bottom of the desulfurization area (A) is communicated with a desulfurization area nozzle (A1) through a desulfurizer cooler (6), and the bottom of the desulfurizer circulating groove (A3) is sequentially communicated with a hydrocyclone separator (3), a filter (4) and a centrifuge (5); a decarbonizer circulating groove (B3) at the bottom of the decarbonization area (B) is communicated with the upper part of the decarbonizer regeneration tower (2) through a decarbonizer lean rich liquid heat exchanger (7); a demister (12) of the tail gas treatment discharge area (C) is communicated with a fan (11) through a reheater (10); the top end of the decarbonizer regeneration tower (2) and CO2The purification device (9) is communicated, and the bottom end of the decarbonizer regeneration tower (2) is communicated with a nozzle (B1) of a decarbonization area through a decarbonizer lean and rich liquid heat exchanger (7) and a decarbonizer cooler (8) in sequence.
Further, the CO is2Purification device (9) from CO2A buffer tank, a cooling water diversion tank and a liquefier.
A flue gas desulfurization and decarburization coupled treatment method comprises the following steps:
step 1, a desulfurization process: limestone slurry with the concentration of 10-15 wt% is used as a desulfurizer, flue gas entering from the bottom of the absorption tower (1) is in countercurrent contact with limestone slurry sprayed from the top of a desulfurization area (A), and the limestone slurry and SO are mixed2Reaction to produce CaSO3Then flows back to the desulfurizer circulation tank (A3), CaSO3Oxidizing and crystallizing the mixture into gypsum (CaSO) under the conditions of stirring and air blowing4·2H2O), the desulfurized flue gas rises to enter a decarburization area (B);
step 2, decarburization process: adopts the basic solvents of Monoethanolamine (MEA), active amine Piperazine (PZ) and H2A compound alcohol amine solution consisting of O, sodium molybdate as a corrosion inhibitor and acetaldoxime (AAO) as an antioxidant is used as a decarbonizer, and the mass ratio of MEA to PZ to H is2AAO sodium molybdate =3: 1: 6: 0.015: 0.005; the desulfurized flue gas entering from the bottom end of the decarburization area (B) is in countercurrent contact with a compound alcohol amine solution sprayed from the top end of the decarburization area (B), and the alcohol amine absorbs CO2The carbonate flows back to the decarbonizer circulating groove (B3) after being generated;
and 3, treating and discharging tail gas: and (3) the flue gas after desulfurization and decarburization enters a tail gas washing area (C), entrained fog drops are removed through a demister, and then the flue gas is discharged through a chimney around a reheater (10).
Further, the desulfurization product is oxidized and separated after the step 1: and (2) performing solid-liquid separation on the desulfurizer containing the gypsum after desulfurization in the step (1), dehydrating the gypsum slurry under the action of the hydraulic cyclone (3), the filter (4) and the centrifuge (5) to reduce the water content of the gypsum to 5%, and supplementing limestone slurry to the desulfurizer separated from the gypsum slurry in the desulfurizer circulating tank (A3), so that the flue gas desulfurization can be continuously performed.
Further, the decarbonizer is heated and regenerated after the step 2: the rich solution flowing back to the decarbonizer circulating groove (B3) after decarbonization flows through a decarbonizer lean and rich solution heat exchanger (7) and then enters a decarbonizer regeneration tower (2), carbonate is regenerated into lean solution under the heating action, and CO is desorbed2The barren liquor flows back to the top of the decarburization area (B) after passing through the decarbonizer cold zone device (8), and the flue gas decarburization can be continued.
It is preferable thatCO is also carried out after the decarbonizing agent is heated and regenerated2Purification and liquefaction: CO desorbed after decarbonizer regeneration2Into CO2And the buffer tank is used for storing for later use after cooling, water separation and liquefaction.
Has the advantages that: the flue gas desulfurization and decarburization coupled treatment system and method have the following advantages that:
(1) SO is respectively finished in different areas of the same absorption tower2Absorption and CO2Absorption, realizing the coupling of flue gas desulfurization and decarburization; (2) the original wet flue gas desulfurization system is transformed into a desulfurization and decarburization coupled process system, so that the equipment investment cost can be reduced on the basis of realizing desulfurization and decarburization of flue gas simultaneously; (3) the desulfurization and decarburization coupled process system has small occupied area and simple and convenient operation; (4) the coupling process system for desulfurization and decarburization adopts a desulfurizing agent and a decarburization agent with mature technology, and the operation is stable and reliable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a processing system of the present invention.
Wherein: 1-an absorption column; 2-a decarbonizer regeneration tower; 3-a hydrocyclone separator; 4-a filter; 5-a centrifuge; 6-desulfurizer cooler; 7-a decarbonizer lean-rich liquor heat exchanger; 8-a decarbonizer cooler; 9-CO2A purification device; 10-a reheater; 11-a fan; 12-demister.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Example 1
As shown in figure 1, a flue gas desulfurization and decarburization coupled treatment system comprises an absorption tower (1), a decarburization agent regeneration tower (2), a hydrocyclone (3), and a filter (2)4) A centrifuge (5), a desulfurizer cooler (6), a decarbonizer lean and rich liquid heat exchanger (7), a decarbonizer cooler (8) and CO2The device comprises a purification device (9), the interior of an absorption tower (1) is sequentially divided into a desulfurization area (A), a decarburization area (B) and a tail gas washing area (C) from bottom to top, the top of a desulfurizer circulating groove (A3) at the bottom of the desulfurization area (A) is communicated with a desulfurization area nozzle (A1) through a desulfurizer cooler (6), and the bottom of the desulfurizer circulating groove (A3) is sequentially communicated with a hydrocyclone separator (3), a filter (4) and a centrifuge (5); a decarbonizer circulating groove (B3) at the bottom of the decarbonization area (B) is communicated with the upper part of the decarbonizer regeneration tower (2) through a decarbonizer lean rich liquid heat exchanger (7); a demister (12) of the tail gas treatment discharge area (C) is communicated with a fan (11) through a reheater (10); the top end of the decarbonizer regeneration tower (2) and CO2The purification device (9) is communicated, the bottom end of the decarbonizer regeneration tower (2) is communicated with a decarbonization area nozzle (B1) through a decarbonizer lean and rich solution heat exchanger (7) and a decarbonizer cooler (8) in sequence, and CO is2Purification device (9) from CO2A buffer tank, a cooling water diversion tank and a liquefier.
A flue gas desulfurization and decarburization coupled treatment process comprises the following steps:
(1) and (3) desulfurization process: limestone slurry with the concentration of 10-15 wt% is used as a desulfurizer, flue gas entering from the bottom of a desulfurization zone is in countercurrent contact with limestone slurry sprayed from the top of the desulfurization zone, and the slurry and SO2Reaction to produce CaSO3Then flows back to the desulfurizer circulation tank, CaSO3Oxidizing and crystallizing the mixture into gypsum (CaSO) under the conditions of stirring and air blowing4·2H2O), enabling the desulfurized flue gas to ascend to enter a decarbonization area;
(2) and (3) oxidizing and separating desulfurization products: the desulfurizing agent containing gypsum after desulfurization is subjected to solid-liquid separation, gypsum slurry is dehydrated under the action of a hydrocyclone, a filter, a centrifuge and the like, the water content of the gypsum is reduced to 5%, and fresh limestone slurry is supplemented to the desulfurizing agent separated from the gypsum slurry in a desulfurizing agent circulating tank in time, so that the flue gas desulfurization can be continuously carried out;
(3) and (3) decarburization process: adopts a mixture of a base solvent of Monoethanolamine (MEA), active amine Piperazine (PZ), a corrosion inhibitor of sodium molybdate and an Antioxidant of Acetaldoxime (AAO)) The formed compound alcohol amine solution is used as a decarbonizer, and the mass ratio of MEA to PZ to H is2AAO sodium molybdate =3: 1: 6: 0.015: 0.005; the desulfurization flue gas entering from the lower end of the decarburization area is in countercurrent contact with a compound alcohol amine solution sprayed from the top end of the decarburization area, and the alcohol amine absorbs CO2After the carbonate is generated, the carbonate flows back to the decarbonizer circulating groove;
(4) heating and regenerating the decarbonizing agent: after decarburization, rich liquor flowing back to the decarbonizer circulation tank flows through the decarbonizer lean and rich liquor heat exchanger and then enters a decarbonizer regeneration tower, carbonate is regenerated into lean liquor under the heating action, and CO is desorbed2The barren solution flows back to the top of the decarburization area after passing through the cold area device, so that the flue gas decarburization can be continued;
(5) and (3) tail gas treatment and emission: the flue gas after desulfurization and decarburization enters a tail gas treatment and discharge area, entrained fog drops are removed by a demister, and then the flue gas is discharged by a chimney through the periphery of a reheater;
（6）CO2purification and liquefaction: complete decarbonizer regeneration to desorb CO2Into CO2And the buffer tank is used for storing for later use after cooling, water separation and liquefaction.
Example 2
A flue gas desulfurization and decarburization coupled treatment process comprises the following steps:
(1) and (3) desulfurization process: limestone slurry with the concentration of 10-15 wt% is used as a desulfurizer, flue gas entering from the bottom of a desulfurization zone is in countercurrent contact with limestone slurry sprayed from the top of the desulfurization zone, and the slurry and SO2Reaction to produce CaSO3Then flows back to the desulfurizer circulation tank, CaSO3Oxidizing and crystallizing the mixture into gypsum (CaSO) under the conditions of stirring and air blowing4·2H2O), enabling the desulfurized flue gas to ascend to enter a decarbonization area;
(2) and (3) oxidizing and separating desulfurization products: the desulfurizing agent containing gypsum after desulfurization is subjected to solid-liquid separation, gypsum slurry is dehydrated under the action of a hydrocyclone, a filter, a centrifuge and the like, the water content of the gypsum is reduced to 5%, and fresh limestone slurry is supplemented to the desulfurizing agent separated from the gypsum slurry in a desulfurizing agent circulating tank in time, so that the flue gas desulfurization can be continuously carried out;
(3) and (3) decarburization process: by using hydroxyethyl ethylenediamine as basic solventA compound alcohol amine solution consisting of (AEEA), active amine Piperazine (PZ), corrosion inhibitor sodium molybdate and Antioxidant Acetaldoxime (AAO) is used as a decarbonizer, and the mass ratio of AEEA to PZ to H2AAO sodium molybdate =3: 1: 6: 0.015: 0.005; the desulfurization flue gas entering from the lower end of the decarburization area is in countercurrent contact with a compound alcohol amine solution sprayed from the top end of the decarburization area, and the alcohol amine absorbs CO2After the carbonate is generated, the carbonate flows back to the decarbonizer circulating groove;
(4) heating and regenerating the decarbonizing agent: after decarburization, rich liquor flowing back to the decarbonizer circulation tank flows through the decarbonizer lean and rich liquor heat exchanger and then enters a decarbonizer regeneration tower, carbonate is regenerated into lean liquor under the heating action, and CO is desorbed2The barren solution flows back to the top of the decarburization area after passing through the cold area device, so that the flue gas decarburization can be continued;
(5) and (3) tail gas treatment and emission: the flue gas after desulfurization and decarburization enters a tail gas treatment and discharge area, entrained fog drops are removed by a demister, and then the flue gas is discharged by a chimney through the periphery of a reheater;
（6）CO2purification and liquefaction: complete decarbonizer regeneration to desorb CO2Into CO2And the buffer tank is used for storing for later use after cooling, water separation and liquefaction.
Example 3
A flue gas desulfurization and decarburization coupled treatment process comprises the following steps:
(1) and (3) desulfurization process: limestone slurry with the concentration of 10-15 wt% is used as a desulfurizer, flue gas entering from the bottom of a desulfurization zone is in countercurrent contact with limestone slurry sprayed from the top of the desulfurization zone, and the slurry and SO2Reaction to produce CaSO3Then flows back to the desulfurizer circulation tank, CaSO3Oxidizing and crystallizing the mixture into gypsum (CaSO) under the conditions of stirring and air blowing4·2H2O), enabling the desulfurized flue gas to ascend to enter a decarbonization area;
(2) and (3) oxidizing and separating desulfurization products: the desulfurizing agent containing gypsum after desulfurization is subjected to solid-liquid separation, gypsum slurry is dehydrated under the action of a hydrocyclone, a filter, a centrifuge and the like, the water content of the gypsum is reduced to 5%, and fresh limestone slurry is supplemented to the desulfurizing agent separated from the gypsum slurry in a desulfurizing agent circulating tank in time, so that the flue gas desulfurization can be continuously carried out;
(3) and (3) decarburization process: the decarbonizer is prepared from a compound alcohol amine solution consisting of a basic solvent 2-amino-2-methyl-1, 3-propanediol (AMPD), active aminopiperazine (PZ), a corrosion inhibitor sodium molybdate and an Antioxidant Acetaldoxime (AAO), wherein the mass ratio of AMPD to PZ to H is AMPD2AAO sodium molybdate =3: 1: 6: 0.015: 0.005; the desulfurization flue gas entering from the lower end of the decarburization area is in countercurrent contact with a compound alcohol amine solution sprayed from the top end of the decarburization area, and the alcohol amine absorbs CO2After the carbonate is generated, the carbonate flows back to the decarbonizer circulating groove;
(4) heating and regenerating the decarbonizing agent: after decarburization, rich liquor flowing back to the decarbonizer circulation tank flows through the decarbonizer lean and rich liquor heat exchanger and then enters a decarbonizer regeneration tower, carbonate is regenerated into lean liquor under the heating action, and CO is desorbed2The barren solution flows back to the top of the decarburization area after passing through the cold area device, so that the flue gas decarburization can be continued;
(5) and (3) tail gas treatment and emission: the flue gas after desulfurization and decarburization enters a tail gas treatment and discharge area, entrained fog drops are removed by a demister, and then the flue gas is discharged by a chimney through the periphery of a reheater;
（6）CO2purification and liquefaction: complete decarbonizer regeneration to desorb CO2Into CO2And the buffer tank is used for storing for later use after cooling, water separation and liquefaction.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The flue gas desulfurization and decarburization coupled treatment system is characterized by comprising an absorption tower (1), a decarburization agent regeneration tower (2), a hydraulic cyclone separator (3), a filter (4), a centrifuge (5), a desulfurizer cooler (6), a decarburization agent lean and rich solution heat exchanger (7), a decarburization agent cooler (8) and CO2A purification device (9), the interior of the absorption tower (1) is divided into a desulfurization area (A), a decarburization area (B) andthe tail gas washing area (C), the top of a desulfurizer circulating groove (A3) at the bottom of the desulfurization area (A) is communicated with a desulfurization area nozzle (A1) through a desulfurizer cooler (6), and the bottom of the desulfurizer circulating groove (A3) is sequentially communicated with a hydrocyclone separator (3), a filter (4) and a centrifuge (5); a decarbonizer circulating groove (B3) at the bottom of the decarbonization area (B) is communicated with the upper part of the decarbonizer regeneration tower (2) through a decarbonizer lean rich liquid heat exchanger (7); a demister (12) of the tail gas treatment discharge area (C) is communicated with a fan (11) through a reheater (10); the top end of the decarbonizer regeneration tower (2) and CO2The purification device (9) is communicated, and the bottom end of the decarbonizer regeneration tower (2) is communicated with a nozzle (B1) of a decarbonization area through a decarbonizer lean and rich liquid heat exchanger (7) and a decarbonizer cooler (8) in sequence.
2. The coupled flue gas desulfurization and decarbonization processing system of claim 1, wherein the CO is present in a gas stream2Purification device (9) from CO2A buffer tank, a cooling water diversion tank and a liquefier.
3. A flue gas desulfurization and decarburization coupled treatment method comprises the following steps:
step 1, a desulfurization process: limestone slurry with the concentration of 10-15 wt% is used as a desulfurizer, flue gas entering from the bottom of the absorption tower (1) is in countercurrent contact with limestone slurry sprayed from the top of a desulfurization area (A), and the limestone slurry and SO are mixed2Reaction to produce CaSO3Then flows back to the desulfurizer circulation tank (A3), CaSO3Oxidizing and crystallizing the mixture into gypsum (CaSO) under the conditions of stirring and air blowing4·2H2O), the desulfurized flue gas rises to enter a decarburization area (B);
step 2, decarburization process: adopts the basic solvents of Monoethanolamine (MEA), active amine Piperazine (PZ) and H2A compound alcohol amine solution consisting of O, sodium molybdate as a corrosion inhibitor and acetaldoxime (AAO) as an antioxidant is used as a decarbonizer, and the mass ratio of MEA to PZ to H is2AAO sodium molybdate =3: 1: 6: 0.015: 0.005; the desulfurized flue gas entering from the bottom end of the decarburization area (B) is in countercurrent contact with a compound alcohol amine solution sprayed from the top end of the decarburization area (B), and the alcohol amine absorbs CO2After carbonate is generated, the carbon dioxide flows back to the decarbonizer circulation tank(B3)；
And 3, treating and discharging tail gas: and (3) the flue gas after desulfurization and decarburization enters a tail gas washing area (C), entrained fog drops are removed through a demister, and then the flue gas is discharged through a chimney around a reheater (10).
4. The coupled flue gas desulfurization and decarburization processing method according to claim 3, wherein the desulfurization product is oxidized and separated after step 1: and (2) performing solid-liquid separation on the desulfurizer containing the gypsum after desulfurization in the step (1), dehydrating the gypsum slurry under the action of the hydraulic cyclone (3), the filter (4) and the centrifuge (5) to reduce the water content of the gypsum to 5%, and supplementing limestone slurry to the desulfurizer separated from the gypsum slurry in the desulfurizer circulating tank (A3), so that the flue gas desulfurization can be continuously performed.
5. The coupled flue gas desulfurization and decarburization treatment process as claimed in claim 3 or 4, wherein the step 2 is followed by regeneration by heating of the decarburization agent: the rich solution flowing back to the decarbonizer circulating groove (B3) after decarbonization flows through a decarbonizer lean and rich solution heat exchanger (7) and then enters a decarbonizer regeneration tower (2), carbonate is regenerated into lean solution under the heating action, and CO is desorbed2The barren liquor flows back to the top of the decarburization area (B) after passing through the decarbonizer cold zone device (8), and the flue gas decarburization can be continued.
6. The coupled flue gas desulfurization and decarbonization process according to claim 5, wherein the decarbonizer is heated and regenerated and then subjected to CO regeneration2Purification and liquefaction: CO desorbed after decarbonizer regeneration2Into CO2And the buffer tank is used for storing for later use after cooling, water separation and liquefaction.
CN202111430811.1A 2021-11-29 2021-11-29 Flue gas desulfurization and decarburization coupled treatment system and method Pending CN114159950A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117085467A (en) * 2023-10-18 2023-11-21 中太(苏州)氢能源科技有限公司 Desulfurization, decarbonization and desorption integrated tower and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117085467A (en) * 2023-10-18 2023-11-21 中太(苏州)氢能源科技有限公司 Desulfurization, decarbonization and desorption integrated tower and system
CN117085467B (en) * 2023-10-18 2023-12-29 中太(苏州)氢能源科技有限公司 Desulfurization, decarbonization and desorption integrated tower and system

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