CN113750774A - Method and system for mineralizing and absorbing carbon dioxide by using bypass air bleeding and dust collecting ash of cement kiln - Google Patents

Method and system for mineralizing and absorbing carbon dioxide by using bypass air bleeding and dust collecting ash of cement kiln Download PDF

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CN113750774A
CN113750774A CN202111085836.2A CN202111085836A CN113750774A CN 113750774 A CN113750774 A CN 113750774A CN 202111085836 A CN202111085836 A CN 202111085836A CN 113750774 A CN113750774 A CN 113750774A
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slurry
carbon dioxide
absorption tower
bypass air
mineralizing
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CN113750774B (en
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吴秋生
范道荣
贺朋
李小燕
刘薇薇
杜亮波
李鹏儒
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TIANJIN SINOMA ENGINEERING RESEARCH CENTER CO LTD
Tianjin Cement Industry Design and Research Institute Co Ltd
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TIANJIN SINOMA ENGINEERING RESEARCH CENTER CO LTD
Tianjin Cement Industry Design and Research Institute Co Ltd
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    • 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
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    • B01D53/46—Removing components of defined structure
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    • 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
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
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    • B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • 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
    • B01D2257/00—Components to be removed
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Abstract

The invention relates to a method and a system for mineralizing and absorbing carbon dioxide by utilizing bypass air bleeding dust collection of a cement kiln, wherein the method comprises the following steps: s1, adding water into the bypass air-bleeding dust-collecting ash, the additive and the regulator according to a proportion, feeding the mixture into a slurry preparation system, stirring the mixture to prepare slurry, filtering the slurry, and feeding the filtered slurry into a spray mineralization absorption tower system; s2, spraying the filtered slurry into an absorption tower in a spray mineralization absorption tower system, introducing kiln tail waste gas containing carbon dioxide to be treated in a certain proportion, and collecting the slurry absorbing the carbon dioxide at the bottom of the absorption tower; and S3, sending the collected slurry into a solid-liquid separation system, performing filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower. The invention has good carbon dioxide mineralization effect and high mineralization efficiency, realizes that the carbon dioxide absorption rate in kiln tail waste gas reaches 90 percent, and the calcium utilization rate in bypass air-bleeding dust-collecting ash reaches 93 percent.

Description

Method and system for mineralizing and absorbing carbon dioxide by using bypass air bleeding and dust collecting ash of cement kiln
Technical Field
The invention belongs to the technical field of reducing carbon dioxide emission in the cement industry, and particularly relates to a method and a system for mineralizing and absorbing carbon dioxide by utilizing bypass air bleeding dust collection ash of a cement kiln.
Background
According to the statistics of the international energy agency, the carbon dioxide discharged in the global cement production accounts for 7% of the total carbon dioxide discharge, and the cement industry greatly reduces the carbon dioxide discharge and is expected to reduce the adverse effect on climate warming. The cement industry is also a China carbon dioxide emission consumer, and data shows that the total emission amount of the China carbon dioxide in 2019 per year is about 100 hundred million tons, which accounts for 30% of the annual emission amount of the carbon dioxide in the world, wherein the emission amount of the cement industry is about 13.2 million tons, which accounts for about 15% of the total emission amount of the carbon dioxide in national industrial enterprises, and the carbon dioxide emission reduction task of the cement industry is huge.
The mineralization absorption of the carbon dioxide has the characteristics of small environmental risk, no need of monitoring and natural long-term stable existence of the generated carbonate, and is expected to become an important mode for carbon dioxide emission reduction and resource utilization. A large amount of solid wastes containing calcium magnesium oxide or hydroxide are discharged every year in China, can be used for mineralizing and absorbing carbon dioxide, and has the advantages of wide sources, large total solid carbon amount, suitability for local materials and the like. Therefore, one of the methods for reducing the carbon dioxide emission in the cement industry is to react the generated carbon dioxide with alkaline materials generated in the cement manufacturing process to form carbonate, so that permanent carbon fixation is realized, and contribution is made to carbon emission reduction in the cement industry.
The cement kiln bypass air-bleed dust-collecting ash is a calcium-containing alkaline material discharged by a bypass air-bleed system in the cement production process. Because the cement kiln is complex in cooperatively disposing garbage, sludge and solid waste components and high in sulfur and chlorine content, a large amount of alkali, chlorine and sulfur elements are released in the cooperative disposing process of the cement kiln and are circularly enriched in the kiln, so that the crust and the blockage in the kiln are easily caused. In order to avoid the cyclic enrichment of alkali, chlorine and sulfur in a kiln system, when the content of sulfur and chlorine in hot raw materials reaches a certain value, a bypass air release technology is adopted to release a part of flue gas enriched with high-concentration alkali, chlorine and sulfur so as to relieve the problem, and decomposed partial calcium oxide and magnesium oxide and a large amount of alkaline substances are released together with the flue gas. Therefore, the bypass air-release dust-collecting ash is a high-alkali high-chlorine material with complex components, and is mainly used as a mixed material to be added into cement in a small amount at present. In the middle east and Europe abroad and the like, because the raw materials have high chlorine content and the solid wastes are treated cooperatively, a large amount of dust collected by the bypass air discharge is stockpiled; as the consumption of municipal solid waste, sludge, solid waste and hazardous waste in the cement industry in China is increasing, a large number of cement plants are built into a cooperative disposal system, a bypass air discharge system is gradually standard distribution of a cooperative disposal solid waste cement kiln, the generation amount of dust in the bypass air discharge and collection increases year by year, and the difficulty in comprehensive utilization is increased.
The method and the system for mineralizing and absorbing the carbon dioxide discharged by the cement plant by utilizing the bypass air-bleeding dust-collecting ash of the cement plant are important ways for utilizing the bypass air-bleeding dust-collecting ash with high added values, but because the reaction speed of the bypass air-bleeding dust-collecting ash and the carbon dioxide is low, the components of the bypass air-bleeding dust-collecting ash are complex and the like, the method and the system for mineralizing and absorbing the carbon dioxide by utilizing the bypass air-bleeding ash are not reported.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method and a system for mineralizing and absorbing carbon dioxide by using bypass air bleeding dust collection ash of a cement kiln.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
a method for mineralizing and absorbing carbon dioxide by utilizing bypass air bleeding dust collection ash of a cement kiln comprises the following steps:
s1, adding water into the bypass air-releasing dust-collecting ash, the additive and the regulator according to a proportion, feeding the mixture into a slurry preparation system, stirring the mixture to prepare slurry, filtering the slurry, and feeding the filtered slurry into a spray mineralization absorption tower system;
s2, spraying the filtered slurry into an absorption tower in a spray mineralization absorption tower system, introducing kiln tail waste gas containing carbon dioxide to be treated in a certain proportion, and collecting the slurry absorbing the carbon dioxide at the bottom of the absorption tower;
and S3, sending the collected slurry into a solid-liquid separation system, performing filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
Preferably, in step S1, the additives are barium chloride and raw meal powder, wherein the weight ratio of the barium chloride to the dust collected by the bypass air bleeding is 0.01-0.05%, and the weight ratio of the raw meal powder to the dust collected by the bypass air bleeding is 0.05-0.1%.
Preferably, in step S1, the adjusting agent is sodium chloride, and the weight ratio of the sodium chloride to the bypass air-bleeding dust-collecting ash is 0.05-0.1%.
Preferably, in the step S1, the mass fraction of the calcium hydroxide in the filtered slurry is 10 to 2000 times of the saturated solubility.
Preferably, in the step S1, the slurry is filtered to filter out particles larger than 0.4 mm.
Preferably, in the step S2, the volume of the kiln tail waste gas introduced per minute accounts for 0.05 to 0.5 times of the volume of the absorption tower, and the ratio of the injection volume of the filtered slurry to the volume of the kiln tail waste gas introduced is 1:100 to 1: 1000.
Preferably, in the step S2, the volume fraction of the carbon dioxide in the kiln tail waste gas is 5% to 95%, and the temperature of the kiln tail waste gas is 50 ℃ to 350 ℃.
Preferably, in step S3, the collected slurry is primarily settled before being sent to the solid-liquid separation system, the separated liquid is recycled and sprayed into the absorption tower, and the separated solid is sent to the solid-liquid separation system.
The system for mineralizing and absorbing carbon dioxide by utilizing the bypass air bleeding dust collection ash of the cement kiln comprises a slurry preparation system, a spray mineralization absorption tower system and a solid-liquid separation system; the slurry preparation system is used for preparing and filtering slurry, and sending the filtered slurry into the spray mineralization absorption tower system; the spray mineralization absorption tower system is used for enabling the filtered slurry to absorb kiln tail waste gas containing carbon dioxide and collecting the slurry absorbing the carbon dioxide; the solid-liquid separation system is used for carrying out filter pressing dehydration on the slurry absorbed with the carbon dioxide, a filter cake is used as a cement admixture, and the filtrate returns to the absorption tower.
Preferably, the slurry preparation system comprises a stirring device, a filtering device and a pumping device which are connected in sequence, wherein the stirring device is used for mixing and stirring the bypass air-releasing dust-collecting ash, the additive, the regulator and the water to prepare the slurry, the filtering device is used for filtering the slurry prepared by the stirring device, and the pumping device is used for pumping the slurry filtered by the filtering device into an absorption tower of the spray mineralization absorption tower system;
the spray mineralization absorption tower system comprises an absorption tower, wherein a slurry spraying device is arranged at the top of the absorption tower, an air inlet control device is arranged at the middle part of the absorption tower, the slurry spraying device is used for spraying filtered slurry into the absorption tower, the air inlet control device is used for controlling the air inflow of kiln tail waste gas in the absorption tower, a slurry collecting device is arranged at the bottom of the absorption tower, and the slurry collecting device is used for collecting slurry absorbing carbon dioxide and carrying out sedimentation separation on the collected slurry;
the solid-liquid separation system comprises a slurry conveying device, a filter pressing device, a filter cake conveying device and a filtrate circulating device, wherein the slurry conveying device is used for conveying solids subjected to sedimentation separation into the filter pressing device, the filter pressing device is used for carrying out filter pressing and dehydration on the slurry, the filter cake conveying device is used for conveying filter cakes subjected to filter pressing, and the filtrate circulating device is used for returning filtrate subjected to filter pressing to the absorption tower.
The inventor researches and discovers that the reaction rate of mineralizing and absorbing carbon dioxide by using bypass air bleeding dust of a cement kiln alone is influenced by the carbonization degree, and as the carbonization degree is increased, the particles are diffused and CaCO is added3Particle-scale processes such as microporous precipitation mode begin to limit the rate of reaction and the extent of carbonization. The rate of the carbonation reaction may also be affected by the amount of hydroxide participating in the reaction, which slows as free or unbound hydroxide is consumed and the reaction conditions are shifted to less reactive species.
Through a large number of experimental researches, the inventor introduces an additive barium chloride and raw meal powder into the cement kiln bypass air-bleeding dust-collecting ash slurry to accelerate the carbonization reaction, barium ions generated by dissolving barium chloride in water firstly form insoluble barium carbonate (the solubility product is larger than that of calcium carbonate) particles with carbonate ions, and the raw meal powder contains a large amount of calcium carbonate micro-powder, so that micro crystal nuclei are formed in the slurry together, the sedimentation of substances such as carbonized products of calcium carbonate or magnesium carbonate is obviously accelerated, and the carbonization reaction is promoted (see reactions 1-6); meanwhile, sodium chloride serving as a regulator is introduced into the slurry, and sodium ions can penetrate through a calcium carbonate layer generated by reaction due to small radius of the sodium ions and release hydroxide coated by a carbonized product, so that the dissolution rate of calcium hydroxide/magnesium is accelerated, the calcium hydroxide/magnesium continuously participates in the carbonization reaction, and carbon dioxide with the theoretical carbon capacity of more than 80% can be rapidly sealed.
Preparing slurry (solution or suspension) from cement kiln bypass air-bleeding dust-collecting ash, additive barium chloride, raw meal powder, regulator sodium chloride and water, and reacting as follows:
CaO+H2O→Ca(OH)2 (1)
MgO+H2O→Mg(OH)2 (2)
then the slurry is sprayed into an absorption tower to react with carbon dioxide as follows:
CO2+H2O→CO3 2-+2H+ (3)
Ba2++CO3 2-→BaCO3 (4)
Ca(OH)2+CO3 2-→CaCO3 (5)
Mg(OH)2+CO3 2-→MgCO3 (6)
and (3) performing solid-liquid separation and dehydration on the precipitate generated by the reaction, using a filter cake as a cement admixture, and returning the filtrate to the absorption tower for recycling.
The invention has the advantages and positive effects that:
(1) the invention provides a technical route for mineralizing and absorbing carbon dioxide discharged by a cement plant by utilizing bypass air-bleeding dust-collecting ash of the cement plant for the first time, and the technology has the advantages of good carbon dioxide mineralizing effect, high mineralizing efficiency, realization of 90% of carbon dioxide absorption rate in kiln tail waste gas and 93% of calcium utilization rate in the bypass air-bleeding dust-collecting ash, and has important significance for resource utilization of the bypass air-bleeding dust-collecting ash of the cement plant and reduction of carbon dioxide discharge of the cement plant.
(2) According to the invention, the additive and the regulator are introduced into the bypass air-release dust-collecting ash, so that the mineralization rate of carbon dioxide in kiln tail waste gas can be obviously improved, and the kiln tail waste gas is not required to be subjected to pressurization, temperature rise and other treatments.
(3) The invention obviously improves the utilization value of the bypass air-bleeding dust-collecting ash of the cement kiln as a carbon dioxide mineralization absorption material, and calcium carbonate, magnesium carbonate and other materials formed by mineralizing and absorbing carbon dioxide are used as mixed materials to be doped into cement, thereby avoiding the influence on the stability of the cement caused by the calcium oxide and magnesium oxide contained in the bypass air-bleeding dust-collecting ash directly doped into the bypass air-bleeding dust-collecting ash, being suitable for large-area popularization and application and having better popularization and application prospects.
Drawings
FIG. 1 is a flow chart of a system for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A system for mineralizing and absorbing carbon dioxide by utilizing bypass air bleeding dust collection of a cement kiln comprises a slurry preparation system, a spray mineralization absorption tower system and a solid-liquid separation system; the slurry preparation system is used for preparing and filtering slurry, and sending the filtered slurry into the spray mineralization absorption tower system; the spray mineralization absorption tower system is used for enabling the filtered slurry to absorb kiln tail waste gas containing carbon dioxide and collecting the slurry absorbing the carbon dioxide; the solid-liquid separation system is used for carrying out filter pressing dehydration on the slurry absorbed with the carbon dioxide, a filter cake is used as a cement admixture, and the filtrate returns to the absorption tower.
The slurry preparation system comprises a stirring device, a filtering device and a pumping device which are sequentially connected, wherein the stirring device is used for mixing and stirring bypass air-releasing dust-collecting dust, an additive, a regulator and water to prepare slurry; stirring the materials and water by a stirring device according to a predetermined proportion to prepare pulp, wherein particles larger than 0.4 mm are filtered by a filtering device, and the filtered pulp is sent into a spray mineralization absorption tower system by a pumping device.
The spray mineralization absorption tower system comprises an absorption tower, a slurry spraying device is arranged at the top of the absorption tower, an air inlet control device is arranged in the middle of the absorption tower, the slurry spraying device is used for spraying filtered slurry into the absorption tower, the air inlet control device is used for controlling the air inflow of kiln tail waste gas in the absorption tower, a slurry collecting device is arranged at the bottom of the absorption tower, and the slurry collecting device is used for collecting slurry which absorbs carbon dioxide and settling and separating the collected slurry.
The solid-liquid separation system comprises a slurry conveying device, a filter pressing device, a filter cake conveying device and a filtrate circulating device, wherein the slurry conveying device is used for conveying solids subjected to sedimentation separation into the filter pressing device, the filter pressing device is used for carrying out filter pressing and dehydration on the slurry, the filter cake conveying device is used for conveying filter cakes subjected to filter pressing, and the filtrate circulating device is used for returning filtrate subjected to filter pressing to the absorption tower.
Slurry is sprayed from top to bottom in an absorption tower, kiln tail waste gas containing carbon dioxide is sprayed from the middle of a tower body, the carbon dioxide in the kiln tail waste gas reacts with calcium oxide/magnesium oxide or calcium hydroxide/magnesium hydroxide in the slurry, the carbon dioxide is mineralized and absorbed and then enters a slurry collecting device at the bottom of the tower, the slurry in the slurry collecting device is subjected to sedimentation separation firstly, the separated liquid is circulated to the absorption tower for carbon fixation, the settled and separated solid is conveyed to a filter pressing device for filter pressing and dehydration, a filter cake is used as a cement mixed material to enter a cement clinker silo for digestion, and filtrate is returned to the absorption tower for circulation.
The method for mineralizing and absorbing carbon dioxide by utilizing the bypass air bleeding dust collection ash of the cement kiln comprises the following steps:
s1, adding water into the bypass air-bleeding dust-collecting ash, the additive and the regulator according to a proportion, feeding the mixture into a slurry preparation system, stirring the mixture to prepare slurry, filtering the slurry, filtering particles larger than 0.4 mm, and pumping the filtered slurry into a spray mineralization absorption tower system;
the additive comprises barium chloride and raw material powder, wherein the weight ratio of the barium chloride to the bypass air-bleeding dust-collecting ash is 0.01-0.05%, and the weight ratio of the raw material powder to the bypass air-bleeding dust-collecting ash is 0.05-0.1%; the regulator is sodium chloride, and the weight ratio of the sodium chloride to the bypass air-releasing dust-collecting ash is 0.05-0.1%.
The main absorption of CO in the filtered slurry2The substances of (A) are calcium hydroxide and magnesium hydroxide, and the mass fraction of the calcium hydroxide in the filtered slurry is 10 to 2000 times, preferably 10 to 500 times, the saturated solubility of the calcium hydroxide.
S2, spraying the filtered slurry into an absorption tower in a spray mineralization absorption tower system, introducing kiln tail waste gas containing carbon dioxide to be treated in a certain proportion, and collecting the slurry absorbing the carbon dioxide at the bottom of the absorption tower;
the volume of kiln tail waste gas introduced per minute accounts for 0.05-0.5 times of the volume of the absorption tower, and the ratio of the injection volume of the filtered slurry to the volume of the kiln tail waste gas introduced is 1: 100-1: 1000.
The volume fraction of carbon dioxide in the kiln tail waste gas is 5-95%, and the temperature of the kiln tail waste gas is 50-350 ℃.
S3, carrying out primary sedimentation on the collected slurry after absorbing the carbon dioxide, spraying the separated liquid into an absorption tower in a circulating manner, sending the separated solid into a solid-liquid separation system, carrying out filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
Example 1
Preparing absorption slurry (equivalent to 10 times of the mass fraction of a calcium hydroxide saturated solution) with the mass fraction of 16g/L by adding 100 parts of bypass air-bleeding dust-collecting ash, 0.01 part of barium chloride, 0.05 part of raw material powder and 0.05 part of regulator into water according to a proportion by using a slurry preparation system at normal pressure and at the temperature of 25 ℃; and filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1:100, introducing kiln tail waste gas containing carbon dioxide with volume fraction of 5% at the temperature of 50 ℃; and (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
According to the method, the absorption rate of carbon dioxide is equal to (1-the flow rate of carbon dioxide in exhaust gas/the flow rate of carbon dioxide entering an absorption tower) multiplied by 100%, the absorption rate of detected carbon dioxide is 82%, the utilization rate of calcium in the dust collected by the bypass air bleeding is equal to (the calcium content of calcium carbonate in a filter cake/(the calcium content of calcium carbonate in the filter cake + the calcium content of calcium hydroxide in the filter cake and a filtrate) multiplied by 100%, and the utilization rate of calcium in the dust collected by the bypass air bleeding is 85%.
Example 2
Preparing absorption slurry (equivalent to 50 times of the mass fraction of a saturated calcium hydroxide solution) with the mass fraction of 80g/L of calcium hydroxide by using a slurry preparation system and adding 100 parts of bypass air-bleeding dust-collecting ash, 0.02 part of barium chloride, 0.06 part of raw material powder and 0.05 part of regulator in proportion to water at normal pressure and at the temperature of 25 ℃; and filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1: 200, and introducing kiln tail waste gas containing 15 volume percent of carbon dioxide with the gas temperature of 150 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the carbon dioxide is detected to be 87%, and the utilization rate of calcium in the bypass air-releasing dust-collecting ash is detected to be 88%.
Example 3
At normal pressure and 25 ℃, 100 parts of bypass air-bleeding dust-collecting ash, 0.03 part of additive, 0.07 part of raw material powder and 0.05 part of regulator are proportionally added with water by utilizing a slurry preparation system to prepare absorption slurry (equivalent to 100 times of the mass fraction of saturated solution of calcium hydroxide) with the mass fraction of calcium hydroxide of 170 g/L. And filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1: 500, and introducing kiln tail waste gas containing 50% of carbon dioxide by volume fraction at the gas temperature of 200 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the detected carbon dioxide is 90 percent, and the utilization rate of the detected bypass air-releasing dust-collecting ash calcium is 93 percent.
Example 4
At normal pressure and 25 ℃, 100 parts of bypass air-bleeding dust-collecting ash, 0.04 part of additive, 0.08 part of raw meal powder and 0.1 part of regulator are proportionally added with water by utilizing a slurry preparation system to prepare absorption slurry (equivalent to 200 times of the mass fraction of saturated solution of calcium hydroxide) with the mass fraction of calcium hydroxide of 340 g/L. Spraying the prepared slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1: 800, and introducing kiln tail waste gas containing 75 percent of carbon dioxide by volume at the gas temperature of 250 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the detected carbon dioxide is 84%, and the utilization rate of the detected bypass air-releasing dust-collecting ash calcium is 90%.
Example 5
At normal pressure and 25 ℃, 100 parts of bypass air-bleeding dust-collecting ash, 0.05 part of additive, 0.1 part of raw meal powder and 0.1 part of regulator are proportionally added with water by utilizing a slurry preparation system to prepare absorption slurry (equivalent to 500 times of the mass fraction of saturated solution of calcium hydroxide) with the mass fraction of calcium hydroxide of 850 g/L. And filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1:1000, and introducing kiln tail waste gas containing 90 percent of carbon dioxide by volume fraction at the gas temperature of 350 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the detected carbon dioxide is 89%, and the utilization rate of the detected bypass air-releasing dust-collecting ash calcium is 91%.
Comparative example 1
100 parts of bypass air-bleeding dust-collecting ash is added with water to prepare absorption slurry (equivalent to 100 times of the mass fraction of a saturated solution of calcium hydroxide) with the mass fraction of 170g/L by using a slurry preparation system at normal pressure and the temperature of 25 ℃. And filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1: 500, and introducing kiln tail waste gas containing 50% of carbon dioxide by volume fraction at the gas temperature of 200 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the detected carbon dioxide is 62 percent, and the utilization rate of the calcium in the bypass air-releasing dust-collecting ash is 67 percent.
Comparative example 2
At normal pressure and 25 ℃, 100 parts of bypass air-bleeding dust-collecting ash and 0.03 part of additive are proportionally added with water by a slurry preparation system to prepare absorption slurry (equivalent to 100 times of the mass fraction of saturated solution of calcium hydroxide) with the mass fraction of calcium hydroxide of 170 g/L. And filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1: 500, and introducing kiln tail waste gas containing 50% of carbon dioxide by volume fraction at the gas temperature of 200 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the detected carbon dioxide is 71 percent, and the utilization rate of the detected bypass air-releasing dust-collecting ash calcium is 77 percent.
Comparative example 3
At normal pressure and 25 ℃, 100 parts of bypass air-bleeding dust-collecting ash, 0.03 part of additive and 0.07 part of raw meal powder are proportionally added with water by utilizing a slurry preparation system to prepare absorption slurry (equivalent to 100 times of the mass fraction of a calcium hydroxide saturated solution) with the mass fraction of 170g/L of calcium hydroxide. And filtering the prepared slurry, spraying the filtered slurry into an absorption tower, and simultaneously mixing the slurry and kiln tail waste gas according to the volume ratio of 1: 500, and introducing kiln tail waste gas containing 50% of carbon dioxide by volume fraction at the gas temperature of 200 ℃. And (3) firstly carrying out settling separation on the slurry collected at the bottom of the tower body, circulating the separated liquid to the absorption tower, conveying the separated solid to a filter pressing device for filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
The absorption rate of the carbon dioxide is detected to be 76%, and the utilization rate of the bypass air-releasing dust-collecting ash calcium is detected to be 83%.
In summary, examples 1 to 5 show that, by using the system and the method provided by the present invention, the absorption rate of carbon dioxide in the kiln tail flue gas is above 80%, and the highest absorption rate is up to 90%, and although the temperature of the kiln tail flue gas changes, the absorption of carbon dioxide is not significantly affected; compared with the example 3, the additive and the regulator are introduced into the slurry under the same smoke condition, so that the absorption rate of carbon dioxide can be obviously improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for mineralizing and absorbing carbon dioxide by utilizing bypass air bleeding dust collection ash of a cement kiln is characterized by comprising the following steps:
s1, adding water into the bypass air-releasing dust-collecting ash, the additive and the regulator according to a proportion, feeding the mixture into a slurry preparation system, stirring the mixture to prepare slurry, filtering the slurry, and feeding the filtered slurry into a spray mineralization absorption tower system;
s2, spraying the filtered slurry into an absorption tower in a spray mineralization absorption tower system, introducing kiln tail waste gas containing carbon dioxide to be treated in a certain proportion, and collecting the slurry absorbing the carbon dioxide at the bottom of the absorption tower;
and S3, sending the collected slurry into a solid-liquid separation system, performing filter pressing and dehydration, taking a filter cake as a cement mixture, and returning the filtrate to the absorption tower to continuously absorb the mineralized carbon dioxide.
2. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in the step S1, the additives are barium chloride and raw meal powder, wherein the weight ratio of the barium chloride to the bypass air-bleeding dust-collecting ash is 0.01-0.05%, and the weight ratio of the raw meal powder to the bypass air-bleeding dust-collecting ash is 0.05-0.1%.
3. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in the step S1, the modifier is sodium chloride, and the weight ratio of the sodium chloride to the bypass air-bleeding dust-collecting ash is 0.05-0.1%.
4. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in the step S1, the mass fraction of calcium hydroxide in the filtered slurry is 10 to 2000 times of the saturated solubility thereof.
5. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in step S1, the slurry is filtered to filter out particles larger than 0.4 mm.
6. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in the step S2, the volume of kiln tail waste gas introduced per minute accounts for 0.05-0.5 time of the volume of the absorption tower, and the ratio of the injection volume of the filtered slurry to the volume of the kiln tail waste gas introduced is 1: 100-1: 1000.
7. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in the step S2, the volume fraction of carbon dioxide in the kiln tail waste gas is 5-95%, and the temperature of the kiln tail waste gas is 50-350 ℃.
8. The method for mineralizing and absorbing carbon dioxide by using cement kiln bypass air bleeding dust collection ash according to claim 1, is characterized in that: in the step S3, the collected slurry is primarily settled before being sent to the solid-liquid separation system, the separated liquid is recycled and sprayed into the absorption tower, and the separated solid is sent to the solid-liquid separation system.
9. The system for mineralizing and absorbing carbon dioxide by using the cement kiln bypass air bleeding dust collection ash according to any one of claims 1 to 8 is characterized by comprising a slurry preparation system, a spray mineralization absorption tower system and a solid-liquid separation system; the slurry preparation system is used for preparing and filtering slurry, and sending the filtered slurry into the spray mineralization absorption tower system; the spray mineralization absorption tower system is used for enabling the filtered slurry to absorb kiln tail waste gas containing carbon dioxide and collecting the slurry absorbing the carbon dioxide; the solid-liquid separation system is used for carrying out filter pressing dehydration on the slurry absorbed with the carbon dioxide, a filter cake is used as a cement admixture, and the filtrate returns to the absorption tower.
10. The system for mineralizing and absorbing carbon dioxide by utilizing cement kiln bypass air bleeding dust collection ash according to claim 9, wherein: the slurry preparation system comprises a stirring device, a filtering device and a pumping device which are sequentially connected, wherein the stirring device is used for mixing and stirring bypass air-releasing dust-collecting dust, an additive, a regulator and water to prepare slurry;
the spray mineralization absorption tower system comprises an absorption tower, wherein a slurry spraying device is arranged at the top of the absorption tower, an air inlet control device is arranged at the middle part of the absorption tower, the slurry spraying device is used for spraying filtered slurry into the absorption tower, the air inlet control device is used for controlling the air inflow of kiln tail waste gas in the absorption tower, a slurry collecting device is arranged at the bottom of the absorption tower, and the slurry collecting device is used for collecting slurry absorbing carbon dioxide and carrying out sedimentation separation on the collected slurry;
the solid-liquid separation system comprises a slurry conveying device, a filter pressing device, a filter cake conveying device and a filtrate circulating device, wherein the slurry conveying device is used for conveying solids subjected to sedimentation separation into the filter pressing device, the filter pressing device is used for carrying out filter pressing and dehydration on the slurry, the filter cake conveying device is used for conveying filter cakes subjected to filter pressing, and the filtrate circulating device is used for returning filtrate subjected to filter pressing to the absorption tower.
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