CN113230844A - Method and system for comprehensively utilizing cement kiln bypass air release and dust collection - Google Patents

Method and system for comprehensively utilizing cement kiln bypass air release and dust collection Download PDF

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CN113230844A
CN113230844A CN202110523187.3A CN202110523187A CN113230844A CN 113230844 A CN113230844 A CN 113230844A CN 202110523187 A CN202110523187 A CN 202110523187A CN 113230844 A CN113230844 A CN 113230844A
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slurry
bypass air
desulfurizer
cement kiln
solid
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王肇嘉
刘鹏飞
郝利炜
姜树丰
王图强
黄海林
吴学谦
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Beijing Building Materials Academy of Sciences Research
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Beijing Building Materials Academy of Sciences Research
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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
    • B01D53/46—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
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • 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
    • B01D53/77—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
    • B01D53/74—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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/04—Chlorides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/46—Sulfates
    • C01F11/464—Sulfates of Ca from gases containing sulfur oxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/106—Peroxides
    • 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
    • B01D2251/602—Oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides

Abstract

The invention provides a method and a system for comprehensively utilizing bypass air-release dust-collecting ash of a cement kiln, wherein the method comprises the steps of adding water into the bypass air-release dust-collecting ash to prepare slurry, carrying out ultrafine grinding, removing heavy metals in the slurry after the ultrafine grinding by using an electric field strengthening technology, carrying out solid-liquid separation on the slurry after the heavy metals are removed, using the obtained solid as a raw material to prepare a desulfurizer, and returning the desulfurizer to a desulfurization system in the cement production process. The method combines the disposal of the cement kiln bypass air-release dust-collecting ash with the co-production of the desulfurization system, can change the bypass air-release dust-collecting ash into valuables, solves the problem of difficult disposal of the bypass air-release dust-collecting ash, also solves the problem of the source of the desulfurizer in the desulfurization system, can also obtain the byproduct desulfurized gypsum with economic value, supplements each other, reduces the production cost, can be consumed in situ in a factory, does not generate other wastes, and is green and environment-friendly.

Description

Method and system for comprehensively utilizing cement kiln bypass air release and dust collection
Technical Field
The invention relates to the field of comprehensive utilization of waste, in particular to a method and a system for comprehensively utilizing cement kiln bypass air release and dust collection.
Background
The cement kiln can be used for cooperatively treating carbide slag, sludge, household garbage and the like, and the number of the cement kiln production lines at present is not small. However, in the process of cement kiln co-processing, because carbide slag, sludge and household garbage contain a certain amount of potassium, sodium, sulfur and chlorine elements, and because the elements exist in the production process, the cement kiln firing system is easy to crust and block, a bypass ventilation system is additionally arranged on most cement kiln co-processing production lines.
The bypass air release system releases a part of high-temperature smoke (with a part of hot raw materials) from a kiln tail smoke chamber or other adjacent parts, the temperature of the high-temperature smoke is about 1000 ℃, the high-temperature smoke is quickly mixed with air in an air collecting box to reduce the temperature to 350 ℃, then a cyclone dust collector or a cloth bag dust collector is used for collecting the hot raw materials, and the collection of the hot raw materials is also called bypass air release dust collection. The bypass air-release dust-collecting ash contains potassium chloride and sodium chloride with higher concentration, so that the normal operation of the rotary cement kiln can be ensured, but the disposal of the bypass air-release dust-collecting ash becomes a difficult problem.
At present, it is common practice to add the bypass air-bleeding dust-collecting ash as a mixture to the cement product. But firstly, the chloride ions of the product are easy to exceed the standard, and secondly, the strength of the cement is easy to reduce. For example, CN202010233285.9 discloses a combined treatment process and application of solid waste incineration fly ash and bypass air-release dust-collection ash, wherein the bypass air-release ash, the incineration fly ash and glass powder are jointly used to prepare ceramsite or industrial porcelain material. However, the bypass ventilation dust collection is generally required not to be shipped outside the factory if it can be addressed or better utilized on site within the factory.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a system for comprehensively utilizing cement kiln bypass air bleeding dust collection, which can simply realize comprehensive resource utilization of cement kiln bypass air bleeding dust collection in a factory.
The invention adopts the following technical scheme:
the invention provides a method for comprehensively utilizing cement kiln bypass air release and dust collection, which comprises the following steps: and adding water into the bypass air-release dust-collecting ash to prepare slurry, carrying out superfine grinding, removing heavy metals in the slurry after the superfine grinding by using an electric field strengthening technology, carrying out solid-liquid separation on the slurry after the heavy metals are removed, and preparing a desulfurizer by using the obtained solid as a raw material, wherein the desulfurizer returns to a desulfurization system in the cement production process.
The method combines the disposal of the cement kiln bypass air-release dust-collecting ash with the co-production of the desulfurization system, can change the bypass air-release dust-collecting ash into valuables, solves the problem of difficult disposal of the bypass air-release dust-collecting ash, also solves the problem of the source of the desulfurizer in the desulfurization system, can also obtain the byproduct desulfurized gypsum with economic value, supplements each other, reduces the production cost, can be consumed in situ in a factory, does not generate other wastes, and is green and environment-friendly. The comprehensive utilization method of the invention has strong adaptability and wide application range, is basically suitable for all cement enterprises, and has very economic one-time investment cost and operation cost.
Further, the liquid obtained by the solid-liquid separation can be recycled as industrial water or used for preparing a snow-melting agent or used for preparing industrial salts of potassium chloride and sodium chloride.
The invention can also produce a snow-melting agent as a byproduct, has simple preparation method, basically concentrates the liquid obtained after the slurry is separated, and has higher economical efficiency.
Further, preparing bypass air-release dust-collecting ash into slurry by using industrial water at 35-55 ℃, wherein the mass ratio of the industrial water to the bypass air-release dust-collecting ash is 1: 3.0-6.0, and after the slurry is subjected to superfine grinding, the specific surface area of solid particles in the slurry is 3000m3/kg～6000m3/kg。
The bypass air-release dust collection powder is prepared into slurry by adopting water with certain dosage and temperature and then is subjected to superfine grinding, so that the dust collection powder can be ground to be finer and is not agglomerated, and the subsequent heavy metal removal and the desulfurization effect when the powder is used as a desulfurizer are favorably enhanced. At present, more cement kilns begin to cooperatively treat dangerous waste containing heavy metals, so that dust collection ash also contains heavy metals.
In the embodiment of the present invention, there are two ways in which the solid obtained by the solid-liquid separation can be used as a desulfurizing agent.
In the first approach, the solid is added with water to prepare a desulfurizer solution, and then the solution is introduced into a desulfurizing tower to treat the flue gas containing sulfur dioxide. For some cement enterprises, a wet desulfurization tower is added, the obtained solid does not need to be further processed, and only water is added to prepare a desulfurizer solution (the main effective components are calcium hydroxide and calcium oxide) with a certain concentration, and then the desulfurizer solution is introduced into the desulfurization tower to treat the flue gas containing sulfur dioxide.
In the second way, after the solid is mixed with an oxidant to obtain a high-grade desulfurizer, the high-grade desulfurizer is introduced into a cement kiln preheater to react with sulfur oxides for desulfurization. The method can be adopted for cement enterprises without a desulfurizing tower.
The concrete position of the cement kiln preheater is a secondary cyclone outlet ascending pipeline, or a primary cyclone outlet ascending pipeline, or a pipeline after kiln tail waste heat power generation, preferably a pipeline after kiln tail waste heat power generation. Because the pipeline behind the kiln tail waste heat can avoid the influence such as corroding the waste heat power generation device, does not influence the waste heat power generation efficiency simultaneously, and the outlet of the primary cyclone or the outlet of the secondary cyclone is effective, but partial desulfurizer which does not react completely enters the kiln tail waste heat power generation system along with the flue gas, corrodes the power generation equipment, and influences the generated energy.
Wherein, the high-grade desulfurizer can be prepared into slurry or solid.
The oxidant can be a liquid oxidant and/or a solid oxidant, and specifically can be one or more of hydrogen peroxide, sodium peroxide, potassium peroxide, barium peroxide, manganese dioxide, vanadium pentoxide and tungsten trioxide, and preferably consists of 1 part of hydrogen peroxide, 0-0.8 part of sodium peroxide, 0-0.4 part of potassium peroxide, 0.2-1.5 parts of barium peroxide, 0.5-1.0 part of manganese dioxide, 0.1-0.8 part of vanadium pentoxide and 0-0.5 part of tungsten trioxide.
Further, the addition amount of the oxidant accounts for 0.01-0.5 wt% of the solid.
During preparation, the solid oxidant is preferably stirred and mixed in a planetary stirrer, and then the liquid oxidant is added and mixed uniformly.
The invention also provides a system for comprehensively utilizing the bypass air release and dust collection of the cement kiln, which comprises a slurry preparation unit, a slurry separation unit, a liquid recycling unit and a desulfurizer preparation recycling unit;
the slurry preparation unit is used for preparing the cement kiln bypass air-release dust-collecting ash into slurry and ultrafine grinding;
the slurry separation unit is used for removing heavy metals from the slurry after the superfine grinding and carrying out solid-liquid separation to obtain liquid and solid;
the liquid recycling unit is used for recycling the liquid obtained by the slurry separation unit;
and the desulfurizer preparation and reuse unit is used for preparing the solid obtained by the slurry separation unit into a desulfurizer and then returning the desulfurizer to the desulfurization system for reuse.
In a specific embodiment of the invention, the desulfurizer preparation and reuse unit comprises a slurry pool, a water adding pipeline and a desulfurization tower removal pipeline;
or the desulfurizer preparation and reuse unit comprises a slurry pool, oxidant adding equipment and a pipeline of a cement kiln preheater;
or both of the above-described processing routes exist simultaneously.
The invention provides a method for comprehensively utilizing cement kiln bypass air-bleeding dust-collecting, which combines the disposal of the cement kiln bypass air-bleeding dust-collecting with the co-production of a desulfurization system, can change the bypass air-bleeding dust-collecting into valuable, solves the problem of difficult disposal of the bypass air-bleeding dust-collecting, also solves the problem of a desulfurizer source in the desulfurization system, can also obtain byproduct desulfurized gypsum with economic value, supplements each other, reduces the production cost, can be consumed in situ in a factory, does not generate other wastes, and is green and environment-friendly. The comprehensive utilization method of the invention has strong adaptability and wide application range, is basically suitable for all cement enterprises, and has very economic one-time investment cost and operation cost.
Drawings
FIG. 1 is a schematic structural diagram of a system for collecting dust by air bleeding of a bypass of a cement kiln according to the present invention;
wherein, 1-a slurry preparation unit; 2-a slurry separation unit; 3-a liquid reuse unit; 4-a desulfurizer preparation and reuse unit; 5-a first slurry tank; 6-industrial water pipeline; 7-grinding device; 8-a heavy metal removal device; 9-a slurry separator; 10-a second slurry tank; 11-a water adding pipeline; 12-an oxidant addition device; 13-removing a cement kiln preheater pipeline; 14-desulfurization tower removal pipeline; 15-a cement kiln bypass air discharging and dust collecting system; 16-ash storage bin; 17-a desulfurization tower; 18-cement kiln preheater.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
The embodiment provides a system for comprehensively utilizing bypass air release and dust collection of a cement kiln, the structural schematic diagram of which is shown in fig. 1, and the system comprises a slurry preparation unit 1, a slurry separation unit 2, a liquid reuse unit 3 and a desulfurizer preparation reuse unit 4;
the slurry preparation unit 1 is used for preparing slurry and superfine grinding by discharging air and collecting dust from a bypass of the cement kiln;
the slurry separation unit 2 is used for separating the slurry after the superfine grinding to obtain liquid and solid;
the liquid reuse unit 3 is used for recycling the liquid obtained by the slurry separation unit 2;
and the desulfurizer preparation and reuse unit 4 is used for preparing the solid obtained by the slurry separation unit 2 into desulfurizer and returning the desulfurizer to the desulfurization system for reuse.
Specifically, the slurry preparation unit 1 comprises a first slurry tank 5, an industrial water pipeline 6 and a grinding device 7, the slurry separation unit 2 comprises a heavy metal removal device 8 and a slurry separator 9, and the desulfurizer preparation recycling unit 4 comprises a second slurry tank 10, a water adding pipeline 11, a desulfurization tower removing pipeline 14, an oxidant adding device 12 and a cement kiln preheater pipeline 13.
The method for comprehensively utilizing the bypass air-bleeding dust-collecting ash of the cement kiln specifically comprises the steps that the bypass air-bleeding dust-collecting ash collected from the bypass air-bleeding dust-collecting system 15 of the cement kiln is firstly stored in the ash storage bin 16, and the main components of the bypass air-bleeding dust-collecting ash are CaO and SiO2KCl, NaCl etc. are carried to first thick liquid pond 5 through conveyor, the transport mode is truck transport or belt conveyor, utilize the force pump to pour into first thick liquid pond 5 with industrial water into, be equipped with electronic agitating unit in the first thick liquid pond 5, make solid-liquid better mix, prevent solid settlement simultaneously, the thick liquid of stirring passes through conveyor and gets into grinding device 7 through the thick liquid grinding to the target fineness, then let in heavy metal remove device 8 and get into thick liquid separator 9, thick liquid separator 9 adopts and adopts thick liquid separator 9Using a horizontal screw centrifuge or a vacuum filter press, the liquid separated from the slurry enters a liquid recycling unit 3, and the main component of CaCl can be obtained by evaporation and concentration2KCl and NaCl, and can be used as a snow melting agent after being packaged and stored; or separating and purifying potassium chloride and sodium chloride in the liquid.
The solid after the slurry separation enters a second slurry tank 10, a proper amount of water is supplemented through a water adding pipeline 11 to obtain a desulfurizer solution, and the desulfurizer solution enters a desulfurizing tower 17 through a desulfurizing tower pipeline 14 to treat the flue gas containing sulfur dioxide. Specifically, can pass through the screw pump pumping with the desulfurizer solution, the rethread spray gun sprays, the flue gas that contains sulfur dioxide lets in desulfurizing tower 17, the flue gas is with desulfurizer solution reverse contact, the main active ingredient of desulfurizer solution in desulfurizing tower 17 is calcium hydroxide and calcium oxide, sulfur dioxide and calcium hydroxide/calcium oxide reaction, generate calcium sulfite, the desulfurizer solution who reacts with the flue gas falls into the holding vessel of desulfurizing tower 17 bottom, there is agitating unit in the holding vessel, there is pumping installations simultaneously, pumping installations is desulfurizer thick liquid pump sending cycle again and is used, again from desulfurizing tower 17 top, spray through the spray gun. Air needs to be blown into the storage tank at the same time, so that oxygen in the air reacts with calcium sulfite to generate calcium sulfate, and the calcium sulfate which is completely reacted is discharged periodically, precipitated and crystallized to become desulfurized gypsum. Desulfurized gypsum is used as an industrial byproduct in many forms, one of which is a retarder for cement, and is solved in situ in cement enterprises.
For enterprises without a desulfurizing tower, the oxidant with the mass percentage of one ten-thousandth to five thousandth can be added into the solid through the oxidant adding equipment 12 to prepare the high-grade desulfurizing agent which can be in a slurry state or a solid state, and the prepared high-grade desulfurizing agent is directly added into a first-stage or second-stage cyclone cylinder outlet ascending pipeline of a cement kiln preheater 18 or a pipeline after kiln tail waste heat power generation through a cement kiln preheater pipeline 13 SO as to lead the desulfurizing agent and Sulfur Oxide (SO)x) And reacting to achieve the effect of desulfurization.
The oxidizing agents are classified into two types, liquid oxidizing agents and solid oxidizing agents. The liquid oxidant can be hydrogen peroxide (H)2O2) Securing ofThe oxidizing agent may be sodium peroxide (Na)2O2) Potassium peroxide (K)2O2) Barium peroxide (BaO)2) Manganese dioxide (MnO)2) Vanadium pentoxide (V)2O5) Tungsten trioxide (WO)3) One or more of (a).
Specifically, the preparation method of the slurry high-grade desulfurizing agent comprises the following steps: stirring and mixing one or more solid oxidants in a planetary stirrer, then adding the solid oxidants and the liquid oxidants into the slurry after mixing, and adding a proper amount of water according to the requirement, stirring and mixing to obtain the slurry high-grade desulfurizer.
The preparation method of the solid high-grade desulfurizing agent comprises the following steps: and (3) further extruding and dehydrating or drying the obtained slurry to obtain a solid desulfurizer, uniformly mixing the solid oxidant and the solid desulfurizer, mixing the mixture with the cement raw material by a lifter or a belt, and feeding the mixture into a cement kiln system to achieve a desulfurization effect after the mixture is contacted with flue gas. The liquid oxidant can also be added with a solid desulfurizer, and after being mixed, the liquid oxidant is mixed with the cement raw materials by a lifter or a belt to enter a cement kiln system, so that the liquid oxidant has a desulfurization effect after contacting with the flue gas. Or directly sprayed into an outlet pipeline of the first-stage or second-stage preheater cyclone cylinder by a spray gun through a screw pump alone.
Application example
The system for comprehensively utilizing the cement kiln bypass air-bleeding dust collection provided by the embodiment of the invention is applied to a certain 2500tpd cement production line in Hebei, and the enterprise does not have a desulfurizing tower. Adding oxidant (1 part of hydrogen peroxide, 0.3 part of sodium peroxide, 0.1 part of potassium peroxide, 0.6 part of barium peroxide, 0.7 part of manganese dioxide, 0.2 part of vanadium pentoxide and 0.05 part of tungsten trioxide) into solid slurry obtained by solid-liquid separation to prepare desulfurizer, and introducing the desulfurizer into an ascending pipeline at the outlet of a secondary cyclone cylinder of the preheater, wherein the amount of the oxidant added into the solid slurry is 0.03%, and the amount of the desulfurizer sprayed into the ascending pipeline accounts for 0.1% of the feeding amount of raw materials. Preheater C before spraying desulfurizer2The concentration of sulfur dioxide in the ascending pipeline at the outlet of the cyclone cylinder is 200-350mg/Nm3(drying group, O)2Concentration of 3%), spraying desulfurizing agent, and detecting sulfur dioxide concentration in kiln tail chimney15-30mg/Nm3(drying group, O)2Concentration is 10%), and desulfurizing efficiency is up to 80%.
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: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for comprehensively utilizing cement kiln bypass air release and dust collection is characterized by comprising the following steps: and adding water into the bypass air-release dust-collecting ash to prepare slurry, carrying out superfine grinding, removing heavy metals in the slurry after the superfine grinding by using an electric field strengthening technology, carrying out solid-liquid separation on the slurry after the heavy metals are removed, and preparing a desulfurizer by using the obtained solid as a raw material, wherein the desulfurizer returns to a desulfurization system in the cement production process.
2. The method for comprehensively utilizing the cement kiln bypass air bleeding dust collection according to claim 1, characterized in that the liquid obtained by the solid-liquid separation is recycled as industrial water or used for preparing a snow melt agent or used for preparing potassium chloride and sodium chloride industrial salt.
3. The method for comprehensively utilizing the bypass air-release dust-collecting ash of the cement kiln as claimed in claim 1 or 2, wherein the bypass air-release dust-collecting ash is prepared into slurry by using industrial water with the temperature of 35-55 ℃, the mass ratio of the industrial water to the bypass air-release dust-collecting ash is 1: 3.0-6.0, and after the ultra-fine grinding, the specific surface area of solid particles in the slurry is 3000m3/kg～6000m3/kg。
4. The method for comprehensively utilizing the cement kiln bypass air release dust collection according to any one of claims 1 to 3, characterized in that the solid is added with water to prepare a desulfurizer solution, and then the desulfurizer solution is introduced into a desulfurization tower to treat the flue gas containing sulfur dioxide.
5. The method for comprehensively utilizing the bypass air release and dust collection of the cement kiln according to any one of claims 1 to 3, characterized in that the solid is mixed with an oxidant to obtain a high-grade desulfurizer, and then the high-grade desulfurizer is introduced into a cement kiln preheater to react with sulfur oxides for desulfurization.
6. The method for comprehensively utilizing the cement kiln bypass air release dust collection according to claim 5, wherein the specific position of the inlet of the cement kiln preheater is a secondary cyclone outlet ascending pipeline, or a primary cyclone outlet ascending pipeline, or a pipeline after the power generation by the kiln tail waste heat, preferably a pipeline after the power generation by the kiln tail waste heat.
7. The method for comprehensively utilizing the bypass air release dust collection of the cement kiln according to the claim 5 or 6, wherein the oxidant is one or more of hydrogen peroxide, sodium peroxide, potassium peroxide, barium peroxide, manganese dioxide, vanadium pentoxide and tungsten trioxide, and preferably consists of 1 part of hydrogen peroxide, 0-0.8 part of sodium peroxide, 0-0.4 part of potassium peroxide, 0.2-1.5 parts of barium peroxide, 0.5-1.0 part of manganese dioxide, 0.1-0.8 part of vanadium pentoxide and 0-0.5 part of tungsten trioxide;
and/or the addition amount of the oxidant accounts for 0.01-0.5 wt% of the solid.
8. A system for comprehensively utilizing cement kiln bypass air release and dust collection is characterized by comprising a slurry preparation unit, a slurry separation unit, a liquid recycling unit and a desulfurizer preparation recycling unit;
the slurry preparation unit is used for preparing the cement kiln bypass air-release dust-collecting ash into slurry and ultrafine grinding;
the slurry separation unit is used for removing heavy metals from the slurry after the superfine grinding and carrying out solid-liquid separation to obtain liquid and solid;
the liquid recycling unit is used for recycling the liquid obtained by the slurry separation unit;
and the desulfurizer preparation and reuse unit is used for preparing the solid obtained by the slurry separation unit into a desulfurizer and then returning the desulfurizer to the desulfurization system for reuse.
9. The system for comprehensively utilizing cement kiln bypass air bleeding and dust collecting as claimed in claim 8, wherein the desulfurizer preparation and reuse unit comprises a slurry tank, a water feeding pipeline and a desulfurizing tower pipeline.
10. The system for comprehensively utilizing cement kiln bypass air bleeding and dust collecting ash as claimed in claim 8, wherein the desulfurizer preparation and reuse unit comprises a slurry tank, an oxidant adding device and a pipeline of a cement kiln preheater.
CN202110523187.3A 2021-05-13 2021-05-13 Method and system for comprehensively utilizing cement kiln bypass air release and dust collection Pending CN113230844A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113750774A (en) * 2021-09-16 2021-12-07 天津中材工程研究中心有限公司 Method and system for mineralizing and absorbing carbon dioxide by using bypass air bleeding and dust collecting ash of cement kiln

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113750774A (en) * 2021-09-16 2021-12-07 天津中材工程研究中心有限公司 Method and system for mineralizing and absorbing carbon dioxide by using bypass air bleeding and dust collecting ash of cement kiln

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