CN113200693A - Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process - Google Patents

Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process Download PDF

Info

Publication number
CN113200693A
CN113200693A CN202110375618.6A CN202110375618A CN113200693A CN 113200693 A CN113200693 A CN 113200693A CN 202110375618 A CN202110375618 A CN 202110375618A CN 113200693 A CN113200693 A CN 113200693A
Authority
CN
China
Prior art keywords
series
furnace
cyclone
decomposing furnace
cyclone preheaters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110375618.6A
Other languages
Chinese (zh)
Other versions
CN113200693B (en
Inventor
张同生
汪伟
郭奕群
韦江雄
余其俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
South China University of Technology SCUT
Original Assignee
South China University of Technology SCUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by South China University of Technology SCUT filed Critical South China University of Technology SCUT
Priority to CN202110375618.6A priority Critical patent/CN113200693B/en
Publication of CN113200693A publication Critical patent/CN113200693A/en
Application granted granted Critical
Publication of CN113200693B publication Critical patent/CN113200693B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
    • F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention discloses an off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process, and belongs to the technical field of intersection of cement production and calcium circulation carbon capture. The carbon trapping process utilizes CaO-CaCO between the decomposing furnace and the carbonizing furnace3CO completion of the CaO cycle2Trapping, and simultaneously adopting an off-line decomposing furnace design to avoid SO generated in the processes of clinker firing and raw material preheating2And chlorine alkali sulfur and other impurities enter the decomposing furnace module. Through the coupling of local calcium circulation and an off-line decomposing furnace, the flue gas CO is realized under the condition of air combustion2Self-enrichment and subsequent CO reduction2Difficulty in purification and reuse, and remarkable extractionThe technical economy is improved, and the promotion of carbon capture and reutilization in the cement industry is promoted.

Description

Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process
Technical Field
The invention relates to the technical field of intersection of cement production and calcium cycle carbon capture, in particular to an off-line decomposing furnace and calcium cycle coupled cement production carbon capture device and process.
Background
Along with the rapid development of national economy, Chinese CO2The emission is increased year by year, the emission reaches 94.3 hundred million tons in 2017, wherein the cement industry is CO in China2One of the major sources of emissions (about 20.0 million tons per year, about 21%). Therefore, the pressure of carbon emission reduction in China is extremely high, and the reduction of carbon emission in the cement industry is particularly important and urgent.
Carbon emission reduction in the cement industry is mainly realized by purifying and trapping flue gas, and the current main trapping process comprises the following steps: chemical absorption, membrane separation, pure oxygen combustion, and calcium circulation. The chemical absorption method is that the flue gas of the cement kiln is pressurized, and then hot potassium solution, ammonia water or organic amine and other liquid are adopted to absorb CO2Then the water is desulfurized and removed by a desulfurizing bed and a drying bed, and phosphorus, arsenic and Nitrogen Oxides (NO) are removed by a solid adsorbentx) The impurities are equal, and the industrial grade or food grade CO is finally obtained2. The membrane separation method utilizes the selectivity of the membrane to the diameter of gas molecules, partial gas passes through the molecular membrane under the action of certain pressure, and further CO is realized2Enrichment and separation. The pure oxygen combustion method is to improve the combustion efficiency of fuel and reduce NO by oxygen combustion supportingxDischarge and greatly improve CO in the flue gas2Concentration for carbon capture. The calcium circulation law is that CaO abundantly existing in the cement kiln system is utilized to absorb CO2Formation of CaCO3Then decomposing again in the decomposing furnace to release CO2And trapped, i.e. by "CaO-CaCO3Circulation of-CaO for CO in cement kiln flue gas2Self-enrichment of (1).
In summary, a large amount of chemical reagents and membrane materials are needed when the chemical absorption and membrane separation method is adopted for carbon capture, and the flue gas is required to be pressurized and decompressed, so that the carbon capture cost is greatly increased. In addition, the cement kiln has large flue gas flow and high dust and acid gas content, and the membrane separation method is difficult to continuously carry out CO with high flux2Separation and purification, greatly shortening the absorbent circulationRing life. The pure oxygen environment cost of the whole system of the cement kiln is extremely high, and the industrial popularization difficulty is extremely high. Aiming at the high calcium characteristic of the cement kiln system, the calcium circulation has the potential of realizing high-efficiency carbon capture, and can improve CO in the flue gas of the cement kiln2The concentration of the slurry greatly relieves the difficulty of treating and capturing the tail end of the flue gas of the cement kiln. However, the calcium circulation causes the problems of rapid decrease of CaO activity, low circulation efficiency and the like, and SO released in the process of preheating raw meal simultaneously2Can also participate in the gas circulation of the cement kiln system, and is not beneficial to CO in the flue gas2Self-enrichment of (1).
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides an off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process.
The technical scheme adopted by the invention is as follows: the off-line decomposing furnace and calcium circulation coupled cement production carbon trapping device comprises a preheater-carbonizing furnace-rotary kiln module, an off-line decomposing furnace module and an auxiliary and purifying device, wherein the preheater-carbonizing furnace-rotary kiln module comprises a first series of cyclone preheaters, a carbonizing furnace, a second series of cyclone preheaters, a smoke chamber, a rotary kiln, a tertiary air pipe and a cooler; the off-line decomposing furnace module comprises a decomposing furnace, a third series of cyclone preheaters, a second air distribution device and a booster fan; the auxiliary and purifying device comprises a first SNCR device, a second SNCR device, a first air dividing device, a first material dividing device, a second material dividing device, a first heat exchange device, a second heat exchange device, a condensation and dehydration device, and a CO-rich device2The device comprises a gas collecting and storing device, a dust removing device, an SCR device and a flue gas discharging device;
the number of stages of the cyclone separators of the first series of cyclone preheaters is 4-7, the number of stages of the cyclone separators of the second series of cyclone preheaters is 1-2, and the number of stages of the cyclone separators of the third series of cyclone preheaters is 1-2.
In the carbon trapping device for cement production, a tertiary air pipe of a rotary kiln is divided into two paths through a first air dividing device, wherein one path of tertiary air pipe enters a preheater-carbonization furnace-rotary kiln module and is connected with an air outlet of a smoke chamber and an air inlet of a second series of cyclone preheaters, and the other path of tertiary air pipe enters an off-line decomposing furnace system and is directly connected with an inlet of the decomposing furnace;
an air inlet of the carbonization furnace is connected with an air outlet of the second series of cyclone preheaters;
the air inlet of the first series of cyclone preheaters is connected with the air outlet of the carbonization furnace;
the air outlet of the first series of cyclone preheaters is sequentially connected with the second heat exchange device, the dust removal device, the SCR device and the flue gas discharge device;
the air outlet of the decomposing furnace is connected with the air inlet of the first-last cyclone separator of the third series of cyclone preheaters;
the air outlet of the third series of cyclone preheaters is connected with a second air distribution device and divided into two paths, one path is connected with the off-line decomposing furnace through a booster fan, and the other path is connected with the first heat exchange device, the condensation water removal device and the CO-rich gas2The gas collection and storage device is connected in sequence.
Raw meal is fed into a first-stage cyclone separator air inlet pipe of a first series of cyclone preheaters through a raw meal feeding device, and a discharge port of a penultimate second-stage cyclone separator of the first series of cyclone preheaters is connected with a carbonization furnace. Preferably, the carbonization furnace is provided with a multi-stage necking structure, a feeding hole is arranged above each stage of necking structure, so that multi-point feeding can be realized, the heat exchange efficiency is improved, and the heat emitted by the carbonization reaction is fully utilized to preheat the raw materials;
the discharge port of the first-last cyclone separator of the first series of cyclone preheaters is connected with the air inlet pipe of the first-last cyclone separator of the second series of cyclone preheaters;
the discharge port of the second series of cyclone preheaters is connected with the decomposing furnace through a first material distributing device. Preferably, the decomposing furnace is provided with a multi-stage necking structure, a feeding hole is formed above each stage of necking structure, multi-point feeding can be achieved, and the decomposition reaction rate and efficiency of calcium carbonate are improved.
The decomposing furnace is connected with a feeding port of a third series of cyclone preheaters; the outlet of the decomposing furnace is connected with an air inlet pipe of a third series of cyclone preheaters, and the discharge port of the third series of cyclone preheaters is respectively connected with the carbonization furnace and the kiln tail of the rotary kiln through a second material distributing device to control the proportion of calcium oxide used for local calcium circulation;
preferably, SNCR devices are additionally arranged at the decomposing furnace and the second series of cyclone preheaters to reduce NOx emission;
the lower part of the smoke chamber is connected with the tail of the rotary kiln, and the head of the rotary kiln is connected with a burner and a cooler.
An off-line decomposing furnace and local calcium circulation coupled cement production carbon capture process comprises the following steps:
the tertiary air of the cement kiln is divided into two paths by the first air dividing device, wherein one path of tertiary air enters the preheater-carbonization furnace-rotary kiln module, and the other path of tertiary air enters the off-line decomposition furnace module.
Cement raw materials are fed in an air inlet pipeline of a first-stage cyclone separator of a first series of cyclone preheaters, the heat exchange between the raw materials and flue gas is fully carried out in the first series of cyclone preheaters, and the raw materials enter a carbonization furnace from a penultimate cyclone separator of the first series of cyclone preheaters for further heat exchange, so that the temperature of gas in the carbonization furnace is reduced, and the carbonization reaction is favorably carried out; after gas-solid separation of the flue gas by the first last-stage cyclone separator of the first series of cyclone preheaters, hot raw materials are fed into an air inlet pipeline of the second series of cyclone preheaters to exchange heat with the flue gas at the outlet of the smoke chamber and one path of tertiary air, so that the inlet air temperature of the carbonization furnace is further reduced, and a foundation is laid for improving the carbonization reaction rate and efficiency. In addition, SO released by the thermal decomposition of the sulphides contained in the raw meal during the preheating process2Is discharged along with the flue gas, thereby reducing SO2The content of the impurity gas enters an off-line decomposing furnace module so as to obtain high-purity CO2。
The carbonization furnace has a multi-stage necking structure, and realizes full contact between flue gas and materials through multiple times of spouting, so that the carbonization rate and efficiency are improved.
The hot raw material passing through the second series of cyclone preheaters is fed into the decomposing furnace through the first material distributing device at multiple points so as to improve the decomposition rate and efficiency of the calcium carbonate, the decomposing furnace is provided with a multi-stage necking structure, and a feeding hole is arranged above each stage of necking structure.
The first material distributing device is arranged on a pipeline connecting the second series of cyclone preheaters and the decomposing furnace and is used for adjusting the quantity of hot raw materials entering different parts of the decomposing furnace.
And decomposing furnace burners are arranged at different positions of the decomposing furnace and used for uniformly injecting fuel, so that the temperature field distribution of the decomposing furnace is uniform.
The decomposing furnace burners are all positioned above each stage of reducing structure of the decomposing furnace, are lower than the feed inlet and are used for injecting fuel.
The thermal raw meal is decomposed in a decomposing furnace to produce a large amount of CO2NO in small amountxRemoving by adopting an SNCR device, after gas-solid separation by a third series of cyclone preheaters, enabling the flue gas to enter a second air dividing device and be divided into two paths, and enabling one path to sequentially pass through a first heat exchange device and a condensation water removal device to obtain CO-rich flue gas2Gas, into rich CO2A gas collection and storage device; the other path of the flue gas enters the decomposing furnace again through the booster fan for flue gas circulation.
The second air dividing device is arranged on an air outlet pipeline of the third series of cyclone preheaters and is used for adjusting the entering of rich CO2Gas collection and storage device or the gas amount circulated by the flue gas of the decomposing furnace.
After gas-solid separation of the hot raw material containing a large amount of CaO by a third series of cyclone preheaters, the hot raw material is divided into two paths by a second material distribution device, the first path of hot raw material is fed into an air inlet pipe of a carbonization furnace, is quickly carbonized in a flue gas environment of 600-850 ℃, and CO in the flue gas is captured by local calcium circulation between the carbonization furnace and a decomposing furnace2. The second path of hot raw material is fed into the tail of the rotary kiln and enters the rotary kiln to participate in the burning of clinker.
The method has the following beneficial effects: the invention mainly comprises an off-line decomposing furnace module, a preheater-carbonizing furnace-rotary kiln module and an auxiliary and purification module of a novel dry-process cement kiln, wherein the decomposing furnace is designed off-line to avoid SO2The impurity gases enter the off-line decomposing furnace module, and CaO-CaCO is constructed by the transmission of solid materials in the preheater-carbonizing furnace-rotary kiln module and the off-line decomposing furnace module3CaO circulation to realize CO in cement kiln tail gas2The self-enrichment and the efficient and stable trapping.
Drawings
The invention is further illustrated with reference to the following figures and examples:
FIG. 1 is a block diagram of an off-line decomposing furnace and calcium cycle coupled cement production carbon capture plant.
Description of reference numerals:
1-a first series of cyclone preheaters, 2-a second series of cyclone preheaters, 3-a third series of cyclone preheaters, 4-a carbonization furnace, 5-a first SNCR device, 6-a smoke chamber, 7-a rotary kiln, 8-a rotary kiln burner, 9-a cooler, 10-a first air distribution device, 11-a first material distribution device, 12-a decomposition furnace, 13-a decomposition furnace burner, 14-a second SNCR device, 15-a second air distribution device, 16-a first heat exchange device, 17-a condensation water removal device and 18-rich CO2The system comprises a gas collecting and storing device, 19-a booster fan, 20-a raw material feeding device, 21-a second heat exchange device, 22-a dust removal device, 23-an SCR device, 24-a flue gas exhaust device, 25-a tertiary air pipe and 26-a second material dividing device.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise expressly limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. In the description of the present invention, the terms "injection" and "injection" refer to the introduction of said gaseous or solid material into a desired location by various means known to those skilled in the art, the terms "injection" and "injection" being used interchangeably.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The terms appearing below are explained first:
SNCR: selective non-catalytic reduction; SCR: and (4) selective catalytic reduction.
As shown in FIG. 1, the embodiment of the invention provides a cement production carbon capture device with an off-line decomposition furnace and calcium circulation coupled, the cement production carbon capture device comprises a first series of cyclone preheaters 1, a second series of cyclone preheaters 2, a third series of cyclone preheaters 3, a carbonization furnace 4, a first SNCR device 5, a smoke chamber 6, a rotary kiln 7, a rotary kiln combustor 8, a cooler 9, a first air distribution device 10, a first material distribution device 11, a decomposition furnace 12, a decomposition furnace combustor 13, a second SNCR device 14, a second air distribution device 15, a first heat exchange device 16, a condensation and water removal device 17, a CO-rich device 152The system comprises a gas collecting and storing device 18, a booster fan 19, a raw material feeding device 20, a second heat exchange device 21, a dust removal device 22, an SCR device 23, a flue gas exhaust device 24, a tertiary air pipe 25 and a second material distribution device 26.
The number of stages of the cyclone separators of the first series of cyclone preheaters 1 is 4, the number of stages of the cyclone separators of the second series of cyclone preheaters 2 is 1, and the number of stages of the cyclone separators of the third series of cyclone preheaters 3 is 1.
In the cement production carbon catching device with the off-line decomposing furnace and the local calcium circulation coupled, a tertiary air pipe 25 is divided into two paths through a first air dividing device 10, wherein one path enters a preheater-carbonizing furnace-rotary kiln module and is connected with an air outlet of a smoke chamber 6 and an air inlet of a second series of cyclone preheaters 2; an air inlet of the carbonization furnace 4 is connected with an air outlet of the second series of cyclone preheaters 2; the air inlet of the first series of cyclone preheaters 1 is connected with the air outlet of the carbonization furnace 4; the air outlet of the first series of cyclone preheaters 1 is connected with the second heat exchange device 21, the dust removal device 22, the SCR device 23 and the flue gas exhaust device 24 in sequence. The tertiary air pipe 25 is divided into two paths through the first air dividing device 10, and the other path enters the off-line decomposing furnace module and is directly connected with the inlet of the decomposing furnace 12;
the air outlet of the decomposing furnace 12 is connected with the air inlet of the last-but-one cyclone separator of the third series of cyclone preheaters 3.
The air outlet of the third series cyclone preheater 3 is connected with a second air dividing device 15 and divided into two paths, one path is connected with an off-line decomposing furnace 12 through a booster fan 19, and the other path is connected with a first heat exchange device 16, a condensation water removing device 17 and a CO-rich device2The gas collection and storage means 18 are in turn connected.
Raw meal is fed into the air inlet pipe of the first-stage cyclone separator of the first series of cyclone preheaters 1 through a raw meal feeding device 20, and the discharge port of the penultimate second-stage cyclone separator of the first series of cyclone preheaters 1 is connected with a carbonization furnace 4. Preferably, the raw meal can be fed at multiple points, the heat exchange efficiency is improved, and the heat released by the carbonization reaction is fully utilized to preheat the raw meal;
the discharge port of the first-last cyclone separator of the first series of cyclone preheaters 1 is connected with the air inlet pipe of the first-last cyclone separator of the second series of cyclone preheaters 2;
the discharge port of the second series of cyclone preheaters 2 is connected with the decomposing furnace 12 through the first material distributing device 11, and preferably, the materials can be fed in multiple points, so that the decomposition reaction rate and efficiency of the calcium carbonate are improved;
the decomposing furnace 12 is connected with an air inlet pipe of the third series of cyclone preheaters 3; the outlet of the decomposing furnace 12 is connected with the air inlet pipe of a third series of cyclone preheaters 3, the discharge port of the third series of cyclone preheaters 3 is respectively connected with the carbonization furnace 4 and the kiln tail of the rotary kiln 7 through a second material distributing device 26, and the proportion of calcium oxide used for local calcium circulation is controlled;
preferably, a second SNCR device 14 and a first SNCR device 5 are additionally arranged at the air inlet pipes of the decomposing furnace 12 and the second series of cyclone preheaters 2, so that the NOx emission is reduced;
the lower part of the smoke chamber 6 is connected with the kiln tail of the rotary kiln 7, and the kiln head of the rotary kiln 7 is connected with a rotary kiln combustor 8 and a cooler 9.
An off-line decomposing furnace and local calcium circulation coupled cement production carbon capture process comprises the following specific steps:
the tertiary air of the cement kiln is divided into two paths by the first air dividing device 10, one path of tertiary air enters the preheater-carbonization furnace-rotary kiln module, and the other path of tertiary air enters the off-line decomposition furnace module.
Cement raw materials are fed into a raw material feeding device 20 at an air inlet pipeline of a first-stage cyclone separator of a first series of cyclone preheaters 1, the raw materials and smoke fully generate heat exchange in the first series of cyclone preheaters 1, and the heat exchange is further carried out in a carbonization furnace 4 from a penultimate cyclone separator of the first series of cyclone preheaters 1, so that the gas temperature in the carbonization furnace 4 is reduced, and the carbonization reaction is favorably carried out; after gas-solid separation of the flue gas by the first last-stage cyclone separator of the first series of cyclone preheaters 1, hot raw materials are fed into an air inlet pipeline of the second series of cyclone preheaters 2 to exchange heat with the flue gas at the outlet of the smoke chamber 6 and one path of tertiary air, so that the air inlet temperature of the carbonization furnace 4 is further reduced, and a foundation is laid for improving the carbonization reaction rate and efficiency. In addition, SO released by the thermal decomposition of the sulphides contained in the raw meal during the preheating process2Is discharged along with the flue gas, thereby reducing SO2The content of the impurity gas enters an off-line decomposing furnace module so as to obtain high-purity CO2。
Carbide furnace 4 has multistage throat structure, realizes the flue gas through spouting many times and fully contacts with the material, improves carbonization rate and efficiency.
The hot raw material passing through the second series of cyclone preheaters 2 is fed into the decomposing furnace 12 through the first material distributing device 11 at multiple points so as to improve the decomposition rate and the decomposition efficiency of the calcium carbonate, the decomposing furnace 12 is provided with a multi-stage necking structure, and a feeding hole is arranged above each stage of necking structure.
The first distributing device 11 is arranged on the pipeline connecting the second series of cyclone preheaters 2 and the decomposing furnace 12 and is used for adjusting the quantity of hot raw meal entering different parts of the decomposing furnace 12.
The decomposing furnace burners 13 are arranged at different positions of the decomposing furnace 12 and used for uniformly injecting fuel, so that the uniform distribution of the temperature field of the decomposing furnace 12 is ensured.
The decomposing furnace burners 13 are all positioned above each stage of reducing structure of the decomposing furnace 12, are lower than the feeding device and are used for injecting fuel.
The decomposition of the hot raw meal in the decomposing furnace 12 produces a large amount of CO2NO in small amountxRemoving by a second SNCR device 14, after gas-solid separation by a third series of cyclone preheaters 3, the flue gas enters a second air distribution device 15 and is divided into two paths, and one path of flue gas passes through a first heat exchange device 16 and a condensation water removal device 17 in sequence to obtain CO-rich flue gas2Gas, into rich CO2A gas collection and storage device 18; the other path of the flue gas enters the decomposing furnace again for circulation through a booster fan 19.
The second air dividing device 15 is arranged on an air outlet pipeline of the third series of cyclone preheaters 3 and is used for adjusting the entering of rich CO2Gas collection and storage device 18 or the amount of gas circulated by the flue gas of decomposition furnace 12.
After gas-solid separation of the hot raw material containing a large amount of CaO by the third series of cyclone preheaters 3, the hot raw material is divided into two paths by the second material distribution device 26, the first path of hot raw material is fed into the air inlet pipe of the carbonization furnace 4, is rapidly carbonized in the smoke environment of 600-850 ℃, and CO in smoke is captured by local calcium circulation between the carbonization furnace 4 and the decomposition furnace 122. The second path of hot raw material is fed into the tail of the rotary kiln 7 and enters the rotary kiln 7 to participate in the burning of clinker.
The invention relates to an off-line decomposing furnace and local calcium circulation coupled cement production carbon capture process and a device thereof, which are applied to the cross technical field of cement production and calcium circulation carbon capture. Compared with the prior art, the invention has the following advantages and effects:
1) an off-line design of a decomposing furnace module is adopted, and the temperature of tertiary air and O are utilized2The high content of the catalyst can reduce the air demand and energy consumption of the decomposing furnace; through the circulation of the flue gas of the decomposing furnace, the gas-solid two-phase fluidization in the decomposing furnace is realized under the condition of not increasing the amount of the flue gas, and CaCO is improved3The decomposition efficiency is further improved, and the CO in the gas is further improved2Thereby realizing CO in the flue gas of the cement kiln2Is self-enriched at high concentration. Through the coupling of local calcium circulation and an off-line decomposing furnace, the flue gas CO is realized under the traditional air combustion condition2Self-enrichment obviously improves the technical economy.
2) The off-line design of the decomposing furnace module in the cement kiln system prevents volatile substances such as chlor-alkali sulfur and the like generated in the rotary kiln from entering the decomposing furnace module; on the other hand, SO released by decomposition of sulfide in raw material in the first series of preheaters2When the impurity gas can not enter the decomposing furnace module, the separating decomposing furnace module is favorable for obtaining the CO with ultrahigh concentration and purity2The difficulties of subsequent purification, utilization and the like are further reduced by the smoke.
3) The amount of CaO entering a local calcium circulation system and a rotary kiln is regulated and controlled by utilizing a material distribution device at the outlet of the third series of cyclone preheaters, the high-activity CaO entering a calcium circulation system is dynamically updated, and the CO is maintained by the CaO2The absorption activity of the calcium carbonate realizes the calcium circulation to CO2The continuous and efficient trapping effect is achieved;
4) the decomposing furnace adopts a multi-stage necking structure design, exerts the spouting effect to fully contact the materials with tertiary air, improves the combustion efficiency and improves CO2The generation amount is controlled, the generation of NOx and CO is controlled, and the temperature field in the decomposing furnace is uniformly distributed by utilizing the multi-stage injection of hot raw materials and fuels, so that the local overheating is avoided, and the running safety of equipment is ensured.
5) The decomposing furnace and the smoke chamber air outlet are both provided with an SNCR denitration device, so that the content of impurity gases such as NOx in smoke is reduced, and CO in the smoke is ensured2Is enriched at a high concentration.
In summary, the invention further realizes the off-line design of the decomposing furnace module based on the characteristics of high calcium content, gas-solid flow direction and dynamic characteristics of the cement kiln system, and realizes the C in the cement kiln system by matching the material with the temperature fieldO2The method has the advantages of fully exploiting the carbon capture potential of the novel dry-process cement kiln, and powerfully promoting the sustainable development of the cement industry and realizing the national carbon neutralization ambitious goal.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (5)

1. The off-line decomposing furnace and calcium circulation coupled cement production carbon capturing device is characterized by comprising a preheater-carbonizing furnace-rotary kiln module, an off-line decomposing furnace module and an auxiliary and purifying device, wherein the preheater-carbonizing furnace-rotary kiln module comprises a raw material feeding device (20), a first series of cyclone preheaters (1), a carbonizing furnace (4), a second series of cyclone preheaters (2), a smoke chamber (6), a rotary kiln (7), a rotary kiln combustor (8), a tertiary air pipe (25) and a cooler (9); the off-line decomposing furnace module comprises a decomposing furnace (12), a decomposing furnace burner (13), a third series of cyclone preheaters (3), a second air distribution device (15) and a booster fan (19); the auxiliary and purifying device comprises a first SNCR device (5), a second SNCR device (14), a first air dividing device (10), a first material dividing device (11), a second material dividing device (26), a first heat exchange device (16), a second heat exchange device (21), a condensation and water removal device (17), a CO-rich gas2A gas collecting and storing device (18), a dust removing device (22), an SCR device (23) and a flue gas discharging device (24);
the tertiary air pipe (25) is divided into two paths through the first air dividing device (10), wherein one path enters the preheater-carbonization furnace-rotary kiln module and is connected with the air outlet of the smoke chamber (6) and the air inlet of the second series of cyclone preheaters (2); the other path enters an off-line decomposing furnace module and is directly connected with an inlet of a decomposing furnace (12);
an air inlet of the carbonization furnace (4) is connected with an air outlet of the second series of cyclone preheaters (2);
the air inlet of the first series of cyclone preheaters (1) is connected with the air outlet of the carbonization furnace (4);
the air outlets of the first series of cyclone preheaters (1) are sequentially connected with a second heat exchange device (21), a dust removal device (22), an SCR device (23) and a flue gas discharge device (24);
the air outlet of the decomposing furnace (12) is connected with the air inlet of the first-stage cyclone separator at the last number of the third series of cyclone preheaters (3);
the air outlet of the third series of cyclone preheaters (3) is connected with a second air distribution device (15) and is divided into two paths, one path is connected to an off-line decomposing furnace (12) through a booster fan (19), and the other path is connected with a first heat exchange device (16), a condensation dewatering device (17) and a CO-rich device2The gas collecting and storing device (18) is connected in sequence;
raw materials are fed into an air inlet pipe of a first-stage cyclone separator of a first series of cyclone preheaters (1) through a raw material feeding device (20), a discharge port of a penultimate second-stage cyclone separator of the first series of cyclone preheaters (1) is connected with a carbonization furnace (4), and hot raw materials can be fed at multiple points;
the discharge port of the first-last-stage cyclone separator of the first series of cyclone preheaters (1) is connected with the air inlet pipe of the first-last-stage cyclone separator of the second series of cyclone preheaters (2);
the discharge hole of the second series of cyclone preheaters (2) is connected with the decomposing furnace (12) through a first material distributing device (11); the outlet of the decomposing furnace (12) is connected with the air inlet pipe of the third series of cyclone preheaters (3), and the discharge port of the third series of cyclone preheaters (3) is respectively connected with the carbonization furnace (4) and the kiln tail of the rotary kiln (7) through a second material distribution device (26);
a second SNCR device (14) and a first SNCR device (5) are respectively arranged at the air inlet pipes of the decomposing furnace (12) and the second series of cyclone preheaters (2);
the lower part of the smoke chamber (6) is connected with the kiln tail of the rotary kiln (7), and the kiln head of the rotary kiln (7) is connected with a rotary kiln combustor (8) and a cooler (9).
2. The off-line calciner and calcium cycle coupled cement production carbon capture plant of claim 1 wherein: the number of stages of cyclone separators of the first series of cyclone preheaters (1) is 4-7, the number of stages of cyclone separators of the second series of cyclone preheaters (2) is 1-2, and the number of stages of cyclone separators of the third series of cyclone preheaters (3) is 1-2.
3. The off-line calciner and calcium cycle coupled cement production carbon capture plant of claim 1 wherein: the carbonization furnace (4) is provided with a multi-stage necking structure, and a feeding hole is formed above each stage of necking structure.
4. The off-line calciner and calcium cycle coupled cement production carbon capture plant of claim 1 wherein: the decomposing furnace (12) is provided with a multi-stage necking structure, and a feeding hole is formed above each stage of necking structure.
5. The capture process of the off-line decomposing furnace and calcium circulation coupled cement production carbon capture device is characterized by comprising the following steps of:
the tertiary air of the cement kiln is divided into two paths by a first air dividing device (10), one path of tertiary air enters a preheater-carbonization furnace-rotary kiln module, and the other path of tertiary air enters an off-line decomposing furnace module;
cement raw meal is fed into a raw meal feeding device (20) at an air inlet pipeline of a first-stage cyclone separator of a first series of cyclone preheaters (1), and the raw meal enters a carbonization furnace (4) from a penultimate second-stage cyclone separator of the first series of cyclone preheaters (1); after gas-solid separation of the flue gas is carried out by a first-stage cyclone separator at the last stage of the first series of cyclone preheaters (1), hot raw materials are fed into an air inlet pipeline of a second series of cyclone preheaters (2) to exchange heat with the flue gas at the outlet of the smoke chamber (6) and one path of tertiary air, so that the air inlet temperature of the carbonization furnace (4) is further reduced;
the hot raw meal passing through the second series of cyclone preheaters (2) is fed into a decomposing furnace (12) through a first material distributing device (11) at multiple points; the decomposition of the hot raw meal in the decomposing furnace (12) produces a large amount of CO2NO in small amountxRemoving by a second SNCR device (14), after gas-solid separation by a third series of cyclone preheaters (3), enabling the flue gas to enter a second air distribution device (15) and be divided into two paths, wherein one path sequentially passes through a first heat exchange device (16) and a condensation water removal device (17) to obtain CO-rich flue gas2Gas, into rich CO2A gas collection and storage device (18);the other path of the flue gas enters the decomposing furnace again through a booster fan (19) for circulation;
after gas-solid separation of a large amount of CaO-containing hot raw materials by a third series of cyclone preheaters (3), the hot raw materials are divided into two paths by a second material distribution device (26), the first path of hot raw materials are fed into an air inlet pipe of a carbonization furnace (4), are quickly carbonized in a flue gas environment at 600-850 ℃, and CO in the flue gas is captured by local calcium circulation between the carbonization furnace (4) and a decomposition furnace (12)2(ii) a The second path of hot raw material is fed into the kiln tail of the rotary kiln (7) and enters the rotary kiln (7) to participate in the burning of clinker.
CN202110375618.6A 2021-04-08 2021-04-08 Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process Active CN113200693B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110375618.6A CN113200693B (en) 2021-04-08 2021-04-08 Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110375618.6A CN113200693B (en) 2021-04-08 2021-04-08 Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process

Publications (2)

Publication Number Publication Date
CN113200693A true CN113200693A (en) 2021-08-03
CN113200693B CN113200693B (en) 2022-08-12

Family

ID=77026317

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110375618.6A Active CN113200693B (en) 2021-04-08 2021-04-08 Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process

Country Status (1)

Country Link
CN (1) CN113200693B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115096102A (en) * 2022-05-16 2022-09-23 北京建筑材料科学研究总院有限公司 CO in cement kiln flue gas 2 Capture method and carbon capture system
WO2024033831A1 (en) * 2022-08-10 2024-02-15 Flsmidth A/S Method and plant for manufacturing a cementitous material

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120175136A1 (en) * 2009-08-04 2012-07-12 Cemex Research Group Ag Method for capturing co2 produced by cement plants by using the calcium cycle
US20140161696A1 (en) * 2011-08-15 2014-06-12 Alstom Technology Ltd Integrated carbon dioxide capture for cement plants
US20140352581A1 (en) * 2013-05-31 2014-12-04 Consejo Superior De Investagaciones Cientificas System for CO2 Capture from a Combustion Flue Gas using a CaO/CaCO3 Chemical Loop
CN110052152A (en) * 2019-06-06 2019-07-26 天津水泥工业设计研究院有限公司 One kind being based on cement clinker production line calcium circulation desulfurization system and sulfur removal technology
CN112390552A (en) * 2019-08-12 2021-02-23 天津水泥工业设计研究院有限公司 Cement predecomposition kiln system capable of realizing calcium circulation and method for preparing cement clinker
CN112390551A (en) * 2019-08-12 2021-02-23 天津水泥工业设计研究院有限公司 Adjustable CO reformed from off-line decomposer2Enrichment cement kiln system and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120175136A1 (en) * 2009-08-04 2012-07-12 Cemex Research Group Ag Method for capturing co2 produced by cement plants by using the calcium cycle
US20140161696A1 (en) * 2011-08-15 2014-06-12 Alstom Technology Ltd Integrated carbon dioxide capture for cement plants
US20140352581A1 (en) * 2013-05-31 2014-12-04 Consejo Superior De Investagaciones Cientificas System for CO2 Capture from a Combustion Flue Gas using a CaO/CaCO3 Chemical Loop
CN110052152A (en) * 2019-06-06 2019-07-26 天津水泥工业设计研究院有限公司 One kind being based on cement clinker production line calcium circulation desulfurization system and sulfur removal technology
CN112390552A (en) * 2019-08-12 2021-02-23 天津水泥工业设计研究院有限公司 Cement predecomposition kiln system capable of realizing calcium circulation and method for preparing cement clinker
CN112390551A (en) * 2019-08-12 2021-02-23 天津水泥工业设计研究院有限公司 Adjustable CO reformed from off-line decomposer2Enrichment cement kiln system and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115096102A (en) * 2022-05-16 2022-09-23 北京建筑材料科学研究总院有限公司 CO in cement kiln flue gas 2 Capture method and carbon capture system
WO2024033831A1 (en) * 2022-08-10 2024-02-15 Flsmidth A/S Method and plant for manufacturing a cementitous material

Also Published As

Publication number Publication date
CN113200693B (en) 2022-08-12

Similar Documents

Publication Publication Date Title
CN113237337B (en) Cement production carbon capture device and process with waste co-processing
CN113200693B (en) Off-line decomposing furnace and calcium circulation coupled cement production carbon capture device and process
CN111346605B (en) Pollutant comprehensive treatment system and method suitable for large-scale coal-fired power plant
CN113509834B (en) Local calcium circulation and pure oxygen combustion coupled cement production carbon capture device and process
CN111995264B (en) Process and system for combined production of quick lime and sulfur by reduction-oxidation cyclic calcination of gypsum
CN109573955B (en) Device and process for preparing sulfur and recovering desulfurizer through sulfate carbon thermal reduction
CN107115775B (en) Iron ore sintering flue gas sectional enrichment self-heat exchange emission reduction SOxAnd NOxMethod of producing a composite material
CN113606946B (en) Carbon dioxide capturing system and emission reduction method for cement kiln tail flue gas
CN109482049A (en) A kind of coke oven flue gas dry desulfurization denitration purification integral process
CN111704136B (en) Desulfurization and denitrification coal-based active coke one-step preparation equipment and method
CN115159876B (en) Low-energy-consumption carbon-trapping cement clinker production system and cement clinker preparation method
CN109592647B (en) Process for preparing sulfur and recovering desulfurizing/nitre agent by sulfur/nitrate iron-carbon reduction
CN109775666B (en) Device and method for preparing sulfur by coal gasification in cooperation with calcium sulfate calcination and carbon thermal reduction
CN111302338B (en) Equipment and method for preparing amorphous desulfurization and denitrification active coke by one-step method
CN113120906B (en) Cement production carbon trapping device and process for treating local calcium circulation coupling waste
CN211988670U (en) Pollutant comprehensive treatment system suitable for large coal-fired power plant
CN108970328A (en) A kind of device and technique handling chemical industry high-sulfur waste gas recovery sulphur
CN102393147B (en) Comprehensive processing process for sintering smoke gas
CN109502555A (en) The system and technique of calcium sulfate Recovered sulphur and calcium oxide are decomposed in a kind of charcoal sulphur collaboration
CN108217606B (en) Utilize the cross-flow moving bed device of carbon-based material reduction and desulfurization resolution gas Recovered sulphur
CN103111187A (en) System and method for regenerating magnesium oxides and sulfur dioxides through decomposition of magnesium oxide desulphurization by-products
CN211946286U (en) One-step method for preparing unshaped desulfurization and denitrification active coke equipment
CN109266373A (en) A kind of coal chemical industry power polygenerations systeme based on Cabase compound
CN112158840B (en) System and method for high-sulfur high-oxygen smelting flue gas tempering and carbon material activation
CN211521606U (en) Sterpu activation furnace system with stable and controllable furnace temperature

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant