CN220779668U - System for retrieve carbon dioxide production soda in flue gas - Google Patents
System for retrieve carbon dioxide production soda in flue gas Download PDFInfo
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- CN220779668U CN220779668U CN202322544701.9U CN202322544701U CN220779668U CN 220779668 U CN220779668 U CN 220779668U CN 202322544701 U CN202322544701 U CN 202322544701U CN 220779668 U CN220779668 U CN 220779668U
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- alkali liquor
- communicated
- absorption tower
- primary
- cooler
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 101
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 82
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 51
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 50
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000003546 flue gas Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- 239000003513 alkali Substances 0.000 claims abstract description 288
- 238000010521 absorption reaction Methods 0.000 claims abstract description 137
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 40
- 238000004064 recycling Methods 0.000 claims abstract description 24
- 230000003068 static effect Effects 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 38
- 235000017550 sodium carbonate Nutrition 0.000 claims description 38
- 238000003860 storage Methods 0.000 claims description 25
- 239000008235 industrial water Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 22
- 239000012071 phase Substances 0.000 description 22
- 239000000243 solution Substances 0.000 description 14
- 235000011121 sodium hydroxide Nutrition 0.000 description 12
- 229910021529 ammonia Inorganic materials 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000012452 mother liquor Substances 0.000 description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- RTQCAYKHUMWCEM-UHFFFAOYSA-N [Mg].ClO Chemical compound [Mg].ClO RTQCAYKHUMWCEM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical class [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229940069428 antacid Drugs 0.000 description 1
- 239000003159 antacid agent Substances 0.000 description 1
- 230000001458 anti-acid effect Effects 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000009993 causticizing Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 235000010855 food raising agent Nutrition 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000008141 laxative Substances 0.000 description 1
- 230000002475 laxative effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- -1 national defense Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model relates to a system for producing sodium carbonate by recycling carbon dioxide in flue gas, which comprises a primary alkali liquor absorption tower and a secondary alkali liquor absorption tower which are sequentially communicated, wherein the secondary alkali liquor absorption tower is communicated with a static mixer, the lower part of the primary alkali liquor absorption tower is communicated with a primary alkali liquor circulating pump, the outlet of the primary alkali liquor circulating pump is communicated with a primary alkali liquor cooler, and the primary alkali liquor cooler is communicated with the upper part of the primary alkali liquor absorption tower; the lower part of the secondary alkali liquor absorption tower is communicated with a secondary alkali liquor circulating pump, the outlet of the secondary alkali liquor circulating pump is communicated with a secondary alkali liquor cooler, and the secondary alkali liquor cooler is communicated with the upper part of the secondary alkali liquor absorption tower. A large amount of carbon dioxide in the flue gas is captured and recovered by adopting secondary absorption, so that the method is environment-friendly; the sodium carbonate produced by the system can be recycled to a factory production system or sold, and has good economic benefit; the utility model has the advantages of simple structure, high absorptivity of more than or equal to 99%, safe and stable system operation, etc.
Description
Technical Field
The utility model belongs to the technical field of processes for preparing sodium carbonate by absorbing carbon dioxide, and particularly relates to a system for producing sodium carbonate by recycling carbon dioxide in flue gas.
Background
Carbon dioxide is a major component of greenhouse gases and is a major cause of global warming. The increase of carbon dioxide not only can cause global warming, but also can cause the rise of sea level, and when the concentration of the carbon dioxide reaches a certain value, the health of people can be influenced, so that the reduction of the emission of the carbon dioxide is an important strategic measure in China. In 9 months in 2020, china clearly proposes the goals of carbon reaching peak in 2030 and carbon neutralization in 2060, so that the importance of carbon reduction is self-evident, and carbon dioxide capturing, recycling and sealing are one of important ways of carbon reduction.
The composition of the power plant flue gas and the chemical plant waste gas incineration flue gas is generally N 2、O2、H2O、SO2、NOx、CO2, HCl and other gases, and the flue gas can reach the emission standard after deacidification, desulfurization, denitrification and purification treatment, but contains a large amount of CO 2, and is almost not trapped or recovered at present. In particular, the flue gas of a power plant has larger flow, and the flow is generally in the range of tens to millions of standard squares per hour. The flow rate of CO 2 in the flue gas is about 6 ten thousand standard formulas per hour, namely 94 ten thousand tons per year, calculated according to one million standard formulas per hour of the flue gas and 6v% of the CO 2 content, and the recycling of the part of CO 2 is an important research subject.
Chinese patent CN 113912087A discloses a process for preparing sodium carbonate from carbon dioxide in flue gas and recovering ammonia gas by using magnesium chloride. The process comprises the steps of firstly dissolving industrial solid salt to obtain saturated salt solution, then enabling the saturated salt solution to enter an ammonia absorption device for ammonia absorption to obtain ammonia mother liquor, then compressing flue gas, then sending the ammonia mother liquor into a carbonization device, enabling the ammonia mother liquor to enter the carbonization device for absorbing carbon dioxide in a flue so as to react to obtain heavy alkali (sodium bicarbonate), enabling the carbonized ammonia mother liquor to enter a filtering and separating device, separating mother liquor and heavy alkali, enabling separated filtrate and modified magnesium oxide to enter a low-temperature evaporation device for evaporating ammonia in the filtrate at low temperature, enabling ammonia to enter the ammonia absorption device for recycling, enabling magnesium chloride or magnesium hydroxychloride obtained in the previous step to enter a high-temperature roasting device, enabling decomposed magnesium oxide or magnesium hydroxychloride to be recycled for ammonia evaporation, enabling a heavy alkali part separated in the filtering and separating device to enter a causticizing device for reacting with added lime milk to generate caustic soda, enabling the obtained caustic soda to enter a caustic soda carbonization device for reacting with part of heavy alkali separated from the filtering and separating device, and finally generating sodium carbonate for the next procedure. The method realizes the recycling of ammonia gas when absorbing carbon dioxide by utilizing the principle of a combined alkaline preparation method, utilizes the product sodium bicarbonate and calcined calcium carbonate to prepare caustic soda, reduces carbon dioxide in flue gas and obtains light calcium carbonate with high added value, but increases energy consumption, and has relatively complicated process and low absorption rate of carbon dioxide.
Sodium carbonate (sodium carbonate) is one of important chemical raw materials, and is widely applied to the fields of light industry daily chemicals, building materials, chemical industry, food industry, metallurgy, textile, petroleum, national defense, medicine and the like. As buffering agent, neutralizing agent and dough modifier, can be used for cake and flour food; as a detergent for wool rinsing, bath salts and pharmaceuticals; the food industry is used as a neutralizing agent and a leavening agent; the pharmaceutical industry is used as antacid and osmotic laxative; the metallurgical industry is used as a smelting fluxing agent and a flotation agent for mineral separation; the leather industry is used for degreasing raw leather, neutralizing chrome tanning and improving the alkalinity of chrome tanning liquid; the printing and dyeing industry is used as water softener and the like. The utility model relates to a system for producing sodium carbonate by recycling carbon dioxide in flue gas, which is a reasonable carbon capturing and recycling route.
Disclosure of utility model
The utility model aims to provide a system for producing sodium carbonate by recycling carbon dioxide in flue gas, which aims to solve the problems of low carbon dioxide capture recovery or absorption rate, poor stability, high energy consumption and the like in the flue gas in the prior art.
In order to solve the technical problems, the technical scheme provided by the utility model is as follows:
the system comprises a primary alkali liquor absorption tower and a secondary alkali liquor absorption tower which are sequentially communicated, wherein the secondary alkali liquor absorption tower is communicated with a static mixer, the lower part of the primary alkali liquor absorption tower is communicated with a primary alkali liquor circulating pump, the outlet of the primary alkali liquor circulating pump is communicated with a primary alkali liquor cooler, and the primary alkali liquor cooler is communicated with the upper part of the primary alkali liquor absorption tower; the lower part of the secondary alkali liquor absorption tower is communicated with a secondary alkali liquor circulating pump, the outlet of the secondary alkali liquor circulating pump is communicated with a secondary alkali liquor cooler, and the secondary alkali liquor cooler is communicated with the upper part of the secondary alkali liquor absorption tower.
Wherein the number of the primary alkali liquor circulating pumps is more than two, and the number of the secondary alkali liquor circulating pumps is more than two.
Preferably, the material outlet pipeline of the primary alkali liquor cooler and the material outlet pipeline of the secondary alkali liquor cooler are respectively provided with a corresponding thermometer, the circulating water inlet pipeline of the primary alkali liquor cooler and the circulating water inlet pipeline of the secondary alkali liquor cooler are respectively provided with a corresponding regulating valve, and the thermometers and the regulating valves are electrically connected with a control system.
Preferably, a first alkali liquor absorption section is arranged in the primary alkali liquor absorption tower, a second alkali liquor absorption section is arranged in the secondary alkali liquor absorption tower, corresponding fillers are respectively arranged in the first alkali liquor absorption section and the second alkali liquor absorption section, and the fillers comprise pall rings, taylor flowers rings and short stepped rings.
Preferably, a first alkali liquor storage section is arranged below a first alkali liquor absorption section in the primary alkali liquor absorption tower, a first gas phase inlet and a first alkali liquor absorption tower alkali liquor inlet are arranged above the first alkali liquor storage section, a first circulating alkali liquor outlet is arranged at the bottom of the first alkali liquor storage section, a first liquid distributor is arranged above the first alkali liquor absorption section, the first circulating alkali liquor outlet is communicated with the first liquid distributor through a pipeline, and a primary alkali liquor circulating pump and a primary alkali liquor cooler are arranged on the pipeline connecting the first circulating alkali liquor outlet and the first liquid distributor.
Preferably, a second alkali liquor storage section is arranged below a second alkali liquor absorption section in the second alkali liquor absorption tower, a second gas phase inlet is arranged above the second alkali liquor storage section, a second circulating alkali liquor outlet is arranged at the bottom of the second alkali liquor storage section, a second liquid distributor is arranged above the second alkali liquor absorption section, the second circulating alkali liquor outlet is communicated with the second liquid distributor through a pipeline, and a second alkali liquor circulating pump and a second alkali liquor cooler are arranged on the pipeline connecting the second circulating alkali liquor outlet and the second liquid distributor.
The first alkali liquor absorption section (alkali liquor absorption section of the primary alkali liquor absorption tower) is used for recycling alkali liquor in the first alkali liquor absorption section, countercurrent absorbing carbon dioxide gas, further preparing sodium carbonate solution, and conveying a small amount of unabsorbed carbon dioxide gas to the alkali liquor absorption section of the secondary alkali liquor absorption tower for absorption; and a second alkali liquor absorption section (an alkali liquor absorption section of the secondary alkali liquor absorption tower) for countercurrent contact absorption of carbon dioxide gas and alkali liquor so as to prepare sodium carbonate solution.
Preferably, the second liquid distributor is provided with an external alkali liquor inlet, and the external alkali liquor inlet is communicated with the static mixer. The secondary alkali liquor absorption tower absorbs alkali liquor which is a mixture of industrial alkali liquor and industrial water, and the mixture is mixed by a static mixer and then enters the secondary alkali liquor absorption tower.
Preferably, the static mixer is respectively communicated with an alkali liquor pipeline and an industrial water pipeline.
Preferably, a demister is arranged at the top of the secondary alkali liquor absorption tower, and a demister cleaning device is arranged below the demister.
Preferably, the top end of the primary alkali liquid absorption tower is provided with a first gas phase outlet which is communicated with a second gas phase inlet; the top end of the secondary alkali liquor absorption tower is provided with a second gas phase outlet which is communicated to a chimney.
Preferably, the first-level alkali liquor circulating pump is communicated with the first-level alkali liquor cooler through a pipeline and is also communicated with a finished sodium carbonate solution outlet pipeline; the pipeline communicated between the secondary alkali liquor circulating pump and the secondary alkali liquor cooler is also communicated with an alkali liquor inlet of the primary alkali liquor absorption tower.
The system for producing sodium carbonate by recycling carbon dioxide in flue gas is characterized in that regulating valves are arranged on a gas phase inlet pipeline, a liquid phase outlet pipeline and inlet pipelines of industrial alkali liquor and industrial water of a primary alkali liquor absorption tower, and are electrically connected with a control system for controlling air inlet pressure, product concentration, liquid level of an absorption tower kettle and the like.
Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:
1. The system can collect and recycle a large amount of carbon dioxide in the flue gas, is environment-friendly, and is beneficial to realizing carbon-to-peak carbon neutralization in the flue gas treatment industry in the early days;
2. The system adopts secondary absorption, the process is simple, and the absorption rate is more than or equal to 99 percent; the sodium carbonate produced by the system can be recycled to a factory production system or sold, and has good economic benefit;
3. The system equipment adopts high corrosion-resistant and temperature-resistant materials, the internal structure is specially designed, and the system operation is safe and stable.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of the structure of the primary lye absorber of the present utility model;
FIG. 3 is a schematic diagram of the structure of the secondary lye cooler of the present utility model.
Detailed Description
The utility model will be further understood by reference to the following examples which are given to illustrate the utility model but are not intended to limit the scope of the utility model.
Referring to fig. 1-3, a system for producing sodium carbonate by recycling carbon dioxide in flue gas comprises a static mixer 1, a primary alkali liquor absorption tower 2, primary alkali liquor circulation pumps 3 and 4, a primary alkali liquor cooler 5, a secondary alkali liquor absorption tower 6, secondary alkali liquor circulation pumps 7 and 8 and a secondary alkali liquor cooler 9.
The primary alkali liquor absorption tower 2 and the secondary alkali liquor absorption tower 6 are sequentially communicated, the secondary alkali liquor absorption tower 6 is communicated with the static mixer 1, the lower part of the primary alkali liquor absorption tower 2 is communicated with the primary alkali liquor circulating pumps 3 and 4, the outlets of the primary alkali liquor circulating pumps 3 and 4 are communicated with the primary alkali liquor cooler 5, and the primary alkali liquor cooler 5 is communicated with the upper part of the primary alkali liquor absorption tower 2; the lower part of the secondary alkali liquor absorption tower 6 is communicated with secondary alkali liquor circulating pumps 7 and 8, the outlets of the secondary alkali liquor circulating pumps 7 and 8 are communicated with a secondary alkali liquor cooler 9, and the secondary alkali liquor cooler 9 is communicated with the upper part of the secondary alkali liquor absorption tower 6.
The material outlet pipeline of the primary alkali liquor cooler 5 and the material outlet pipeline of the secondary alkali liquor cooler 9 are respectively provided with corresponding thermometers, the circulating water inlet pipeline of the primary alkali liquor cooler 5 and the circulating water inlet pipeline of the secondary alkali liquor cooler 9 are respectively provided with corresponding regulating valves, and the thermometers and the regulating valves are electrically connected with a control system.
The primary alkali liquor absorption tower 2 is internally provided with a first alkali liquor absorption section 10, the secondary alkali liquor absorption tower 6 is internally provided with a second alkali liquor absorption section 11, the first alkali liquor absorption section 10 and the second alkali liquor absorption section 11 are internally provided with corresponding fillers, and the fillers are pall rings, taylor flowers rings, short stepped rings and the like.
The first alkali liquor absorbing section 10 below in the first alkali liquor absorbing tower is equipped with first alkali liquor liquid storage section 12, first alkali liquor liquid storage section 12 top is equipped with first gas phase import 13 and first alkali liquor absorbing tower alkali liquor import 14, first alkali liquor liquid storage section 12 bottom is equipped with first circulation alkali liquor export 15, first alkali liquor absorbing section's top is equipped with first liquid distributor 16, first circulation alkali liquor export 15 communicates with first liquid distributor 16 through the pipeline, be equipped with first alkali liquor circulating pump 3, 4 and first alkali liquor cooler 5 on the pipeline of connecting first circulation alkali liquor export 15 and first liquid distributor 16.
The lower part of a second alkali liquor absorption section 11 in the secondary alkali liquor absorption tower is provided with a second alkali liquor storage section 17, a second gas phase inlet 18 is arranged above the second alkali liquor storage section 17, the bottom of the second alkali liquor storage section 17 is provided with a second circulating alkali liquor outlet 19, the upper part of the second alkali liquor absorption section is provided with a second liquid distributor 20, the second circulating alkali liquor outlet 19 is communicated with the second liquid distributor 20 through a pipeline, and the pipeline connecting the second circulating alkali liquor outlet 19 and the second liquid distributor 20 is provided with secondary alkali liquor circulating pumps 7 and 8 and a secondary alkali liquor cooler 9.
The first alkali liquor absorption section (alkali liquor absorption section of the primary alkali liquor absorption tower) is used for recycling alkali liquor in the first alkali liquor absorption section, countercurrent absorbing carbon dioxide gas, further preparing sodium carbonate solution, and conveying a small amount of unabsorbed carbon dioxide gas to the alkali liquor absorption section of the secondary alkali liquor absorption tower for absorption; and a second alkali liquor absorption section (an alkali liquor absorption section of the secondary alkali liquor absorption tower) for countercurrent contact absorption of carbon dioxide gas and alkali liquor so as to prepare sodium carbonate solution.
The second liquid distributor 20 is provided with an external alkali liquor inlet 21, the external alkali liquor inlet 21 is communicated with the static mixer 1, and the static mixer 1 is respectively communicated with an alkali liquor pipeline 22 and an industrial water pipeline 23; the secondary alkali liquor absorption tower absorbs alkali liquor which is a mixture of industrial alkali liquor and industrial water, and the mixture is mixed by a static mixer and then enters the secondary alkali liquor absorption tower.
The top of the secondary alkali liquor absorption tower is provided with a demister 24 (comprising a demister, and a demister cleaning device is arranged below the demister).
The top end of the primary alkali liquid absorption tower is provided with a first gas phase outlet 25, and the first gas phase outlet 25 is communicated with a second gas phase inlet 18; the top end of the secondary alkali liquor absorption tower is provided with a second gas phase outlet 26, the second gas phase outlet 26 is communicated to a chimney, and the flue gas after carbon dioxide absorption passes through the gas phase outlet 26 of the secondary alkali liquor absorption tower to the chimney.
The first-level alkali liquor circulating pumps 3 and 4 are communicated with the first-level alkali liquor cooler 5 and also are communicated with a finished sodium carbonate solution outlet pipeline; the two-stage lye circulation pumps 7 and 8 are communicated with the two-stage lye cooler 9 and are also communicated with the lye inlet 14 of the primary lye absorption tower.
The system for producing sodium carbonate by recycling carbon dioxide in flue gas is characterized in that a gas phase inlet pipeline, a liquid phase outlet pipeline and inlet pipelines of industrial alkali liquor and industrial water of a primary alkali liquor absorption tower are respectively provided with corresponding regulating valves, and each regulating valve is electrically connected with a control system and used for controlling air inlet pressure, product concentration, liquid level of an absorption tower kettle and the like.
The flue gas containing carbon dioxide gas is conveyed to a first gas phase inlet 13 (a tail gas inlet of a primary alkali liquor absorption tower) through a pipeline, alkali liquor of a first alkali liquor liquid storage section 12 of the primary alkali liquor absorption tower is conveyed to a first liquid distributor 16 through primary alkali liquor circulating pumps 3 and 4 through a primary alkali liquor cooler 5, the circulating alkali liquor is evenly distributed in the first alkali liquor absorption section 10, the carbon dioxide gas and the circulating alkali liquor are fully contacted and absorbed on the first alkali liquor absorption section 10 to generate sodium carbonate solution, when the sodium carbonate solution meets the concentration requirement, the carbon dioxide gas and the circulating alkali liquor are conveyed to a storage tank through the primary alkali liquor circulating pumps 3 and 4, a small amount of unabsorbed carbon dioxide gas is continuously conveyed to a second gas phase inlet 18 (a gas phase inlet of the lower half of the secondary alkali liquor absorption tower), the alkali liquor of a second alkali liquor liquid storage section 17 (a liquid storage section of the secondary alkali liquor absorption tower) is conveyed to a second liquid distributor 20 (a liquid distributor of the secondary alkali liquor absorption tower) through secondary alkali liquor circulating pumps 7 and 8, the circulating alkali liquor of the secondary alkali liquor is evenly distributed on the second alkali liquor absorption section 12, and the carbon dioxide gas and the circulating alkali liquor is contacted on the second alkali liquor absorption section 12 to generate the low-concentration sodium carbonate solution; the absorption alkali liquid introduced by the second liquid distributor 20 is obtained by mixing industrial alkali liquid from the outside and industrial water through the static mixer 1; the flue gas after absorbing the carbon dioxide passes through a second gas phase outlet 26 (a gas phase outlet of the secondary alkali liquor absorption tower) to a chimney.
The system for producing sodium carbonate by recycling carbon dioxide in flue gas comprises the following specific steps:
1) Cooling water is introduced into the primary lye cooler 5 and the secondary lye cooler 9; introducing alkali liquor into alkali liquor storage sections of the primary alkali liquor absorption tower and the secondary alkali washing absorption tower; according to the flue gas flow and pressure conditions, the flow and the proportion of industrial alkali liquor and industrial water are reasonably set;
2) The flue gas containing carbon dioxide is conveyed to a primary alkali liquor absorption tower 2 through a pipeline, and is contacted and absorbed with alkali liquor circulating liquor from a tower kettle in an alkali liquor absorption section of the primary alkali liquor absorption tower to generate sodium carbonate solution, and the sodium carbonate solution is continuously conveyed to a storage tank when the concentration requirement is met; the flue gas containing a small amount of carbon dioxide at the outlet (first gas phase outlet) of the primary alkali liquor absorption tower is continuously conveyed to the gas phase inlet of the secondary alkali liquor absorption tower 6, the alkali liquor absorption section of the secondary alkali liquor absorption tower is contacted with alkali liquor circulating liquor from the tower kettle and absorbed to generate low-concentration sodium carbonate solution, the low-concentration sodium carbonate solution is conveyed to the alkali liquor inlet of the primary alkali liquor absorption tower 2 after passing through the secondary alkali liquor circulating pumps 7 and 8, and meanwhile, part of the low-concentration sodium carbonate solution is continuously conveyed to the alkali liquor storage section of the primary alkali liquor absorption tower; the system absorbing alkali liquor is continuously conveyed to a secondary alkali liquor absorbing tower after being mixed by a static mixer; demisting the flue gas after absorbing carbon dioxide to a chimney through a demister of a secondary alkali liquor absorption tower; the utility model can realize the absorption rate of more than or equal to 99 percent.
The present utility model has been described in detail with reference to the embodiments, but the description is only the preferred embodiments of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model should be considered as falling within the scope of the present utility model.
Claims (10)
1. A system for producing sodium carbonate by recycling carbon dioxide in flue gas is characterized in that: the system comprises a primary alkali liquor absorption tower and a secondary alkali liquor absorption tower which are sequentially communicated, wherein the secondary alkali liquor absorption tower is communicated with a static mixer, the lower part of the primary alkali liquor absorption tower is communicated with a primary alkali liquor circulating pump, the outlet of the primary alkali liquor circulating pump is communicated with a primary alkali liquor cooler, and the primary alkali liquor cooler is communicated with the upper part of the primary alkali liquor absorption tower; the lower part of the secondary alkali liquor absorption tower is communicated with a secondary alkali liquor circulating pump, the outlet of the secondary alkali liquor circulating pump is communicated with a secondary alkali liquor cooler, and the secondary alkali liquor cooler is communicated with the upper part of the secondary alkali liquor absorption tower.
2. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 1, wherein: the material outlet pipeline of the primary alkali liquor cooler and the material outlet pipeline of the secondary alkali liquor cooler are respectively provided with a corresponding thermometer, the circulating water inlet pipeline of the primary alkali liquor cooler and the circulating water inlet pipeline of the secondary alkali liquor cooler are respectively provided with a corresponding regulating valve, and the thermometers and the regulating valves are electrically connected with a control system.
3. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 1 or 2, wherein: the first alkali liquor absorption tower in be equipped with first alkali liquor absorption section, be equipped with the second alkali liquor absorption section in the second alkali liquor absorption tower, all be equipped with corresponding filler in first alkali liquor absorption section, the second alkali liquor absorption section, the filler includes pall ring, taylor garland, short ladder ring.
4. A system for producing soda ash by recovering carbon dioxide from flue gas according to claim 3, wherein: the first alkali liquor absorbing section in the first alkali liquor absorbing tower is provided with a first alkali liquor storage section below, a first gas phase inlet and a first alkali liquor absorbing tower alkali liquor inlet are arranged above the first alkali liquor storage section, a first circulating alkali liquor outlet is arranged at the bottom of the first alkali liquor storage section, a first liquid distributor is arranged above the first alkali liquor absorbing section, the first circulating alkali liquor outlet is communicated with the first liquid distributor through a pipeline, and a first-stage alkali liquor circulating pump and a first-stage alkali liquor cooler are arranged on the pipeline connecting the first circulating alkali liquor outlet and the first liquid distributor.
5. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 4, wherein: the lower part of a second alkali liquor absorption section in the second alkali liquor absorption tower is provided with a second alkali liquor storage section, a second gas phase inlet is arranged above the second alkali liquor storage section, the bottom of the second alkali liquor storage section is provided with a second circulating alkali liquor outlet, the upper part of the second alkali liquor absorption section is provided with a second liquid distributor, the second circulating alkali liquor outlet is communicated with the second liquid distributor through a pipeline, and a second alkali liquor circulating pump and a second alkali liquor cooler are arranged on the pipeline connecting the second circulating alkali liquor outlet and the second liquid distributor.
6. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 5, wherein: the second liquid distributor is provided with an external alkali liquor inlet which is communicated with the static mixer.
7. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 1 or 6, wherein: the static mixer is respectively communicated with an alkali liquor pipeline and an industrial water pipeline.
8. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 1, wherein: the top of the secondary alkali liquor absorption tower is provided with a demister, and a demister cleaning device is arranged below the demister.
9. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 5, wherein: the top end of the primary alkali liquor absorption tower is provided with a first gas phase outlet which is communicated with a second gas phase inlet; the top end of the secondary alkali liquor absorption tower is provided with a second gas phase outlet which is communicated to a chimney.
10. The system for producing sodium carbonate by recycling carbon dioxide in flue gas according to claim 1, wherein: the pipeline communicated between the primary alkali liquor circulating pump and the primary alkali liquor cooler is also communicated with a finished sodium carbonate solution outlet pipeline; the pipeline communicated between the secondary alkali liquor circulating pump and the secondary alkali liquor cooler is also communicated with an alkali liquor inlet of the primary alkali liquor absorption tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322544701.9U CN220779668U (en) | 2023-09-19 | 2023-09-19 | System for retrieve carbon dioxide production soda in flue gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322544701.9U CN220779668U (en) | 2023-09-19 | 2023-09-19 | System for retrieve carbon dioxide production soda in flue gas |
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