CN112939002B - Flexibly-adjustable high-activity metakaolin preparation system and preparation method - Google Patents
Flexibly-adjustable high-activity metakaolin preparation system and preparation method Download PDFInfo
- Publication number
- CN112939002B CN112939002B CN202110118219.1A CN202110118219A CN112939002B CN 112939002 B CN112939002 B CN 112939002B CN 202110118219 A CN202110118219 A CN 202110118219A CN 112939002 B CN112939002 B CN 112939002B
- Authority
- CN
- China
- Prior art keywords
- cooling system
- metakaolin
- furnace
- air
- cyclone
- 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.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
-
- 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
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- 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
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27D9/00—Cooling of furnaces or of charges therein
-
- 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
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/007—Cooling of charges therein
- F27D2009/0072—Cooling of charges therein the cooling medium being a gas
-
- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
-
- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0056—Regulation involving cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention belongs to the field of preparation of high-activity metakaolin, and particularly relates to a flexibly-adjustable high-activity metakaolin preparation system and a flexibly-adjustable high-activity metakaolin preparation method. The invention provides a flexibly adjustable high-activity metakaolin preparation system and a preparation method, which fully consider the color requirements of different industries on metakaolin finished products, produce the metakaolin with high activity, and solve the problems of high energy consumption, small processing capacity, difficult control of product quality and the like of the metakaolin preparation system.
Description
Technical Field
The invention belongs to the field of preparation of high-activity metakaolin, and particularly relates to a flexibly-adjustable high-activity metakaolin preparation system and a flexibly-adjustable high-activity metakaolin preparation method.
Background
The prior art and the defects are as follows:
china is the first major country of kaolin resources, and kaolin takes kaolinite as a main mineral and accompanies quartz, illite, goethite, diaspore, calcite and other small amount of minerals. Kaolin (Al) 2 O 3 ·2SiO 2 ·2H 2 O，AS 2 H 2 ) Metakaolin (MK for short) can be generated through dehydration at a proper temperature (600-900 ℃). Kaolin has a layered silicate structure, and is bonded by Van der Waals bonds, OH-ionsIn which the seeds are more firmly bonded. Kaolin undergoes several structural changes when heated in air, and when heated to about 600 ℃, the layered structure of kaolin is broken down by dehydration to form a transition phase, metakaolin, which has poor crystallinity. Because the molecular arrangement of metakaolin is irregular, the metakaolin is in a thermodynamic metastable state and has gelling property under proper excitation. Metakaolin is a highly active artificial pozzolanic material which can be blended with Ca (OH) 2 (CH) and water react with the volcanic ash to produce a hydration product similar to cement. By utilizing the characteristic, when the modified epoxy resin is used as an admixture of cement, the modified epoxy resin reacts with CH generated in the hydration process of the cement, and certain properties of the cement can be improved. As the preparation cost of the metakaolin is lower than that of the clinker, CO in the preparation process of the metakaolin 2 The discharge amount is lower than that of CO in the clinker preparation process 2 The emission, in addition to the wide source of raw material kaolin, is particularly attractive to the use of metakaolin instead of clinker in the building concrete and cement industries under the background that the building concrete and cement industries actively promote carbon emission reduction. In addition, the metakaolin also has the physical properties of small density, large specific surface area, large oil absorption rate and the like, can be applied to building concrete and cement additives, can replace pigments, plastics and rubber fillers, adsorbents, 4A molecular sieves and the like, can be used as raw materials or fillers in the industries of ceramics, papermaking, rubber, coatings, petrifaction and the like, and has higher economic added value due to wide application.
The calcination temperature, calcination atmosphere, residence time, and finished product cooling are process parameters that must be strictly controlled during the metakaolin preparation process, and these parameters will determine the quality of the metakaolin finished product. The metakaolin produced varies in quality and color, both in terms of chemical and mineral composition, due to the presence of different types of kaolin. Generally speaking, the calcination of kaolin with high iron content tends to result in the formation of metakaolin in red or pink color, and concrete or cement in red or pink color tends to be mistaken for poor quality material, which greatly affects the large-scale use of metakaolin in the concrete and cement industry. While other industries do not have strict requirements on the color of metakaolin.
At present, the existing metakaolin preparation methods mainly include fixed bed type, semi-fixed bed type, fluidized bed type and the like. The method for preparing metakaolin by calcining kaolin in a rotary kiln is a commonly adopted method, but when the kaolin is calcined in the rotary kiln, the problems of high system heat consumption, small processing capacity, difficult control of product color and quality and the like exist.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the flexibly adjustable high-activity metakaolin preparation system and the preparation method thereof have important practical significance for fully considering the color requirements of different industries on the metakaolin finished product, producing the metakaolin with high activity, and solving the problems of high energy consumption, small processing capacity, difficult control of product quality and the like of the metakaolin preparation system.
Disclosure of Invention
The invention aims to provide a flexibly-adjustable high-activity metakaolin preparation system and a preparation method thereof, which fully consider the color requirements of different industries on metakaolin finished products, produce high-activity metakaolin, and solve the problems of high energy consumption, low processing capacity, difficult control of product quality and the like of a metakaolin preparation system.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a flexibly adjustable high-activity metakaolin preparation system comprises a suspension preheating system, wherein the number of stages of a cyclone preheater of the suspension preheating system is three-seven, raw material powder is preheated in the cyclone preheater and is subjected to gas-solid separation, the raw material powder subjected to multiple heat exchanges and gas-solid separation enters a calciner system from the last-stage cyclone preheater of the suspension preheating system, the calcining temperature in the calciner system is 650-1000 ℃, the retention time of gas in the calciner system is 2-10 seconds, the calciner system comprises a preheating furnace and a modifying furnace, a necking opening is formed between the preheating furnace and the modifying furnace, and hot materials leaving the calciner system are subjected to gas-solid separation with hot flue gas in the last-stage cyclone preheater of the suspension preheating system and then enter a first cooling system and a second cooling system.
The hot flue gas then preheats many times and gas-solid separation to the raw meal powder of feeding suspension preheating system, finally leaves from suspension preheating system top level cyclone preheater air outlet, carries out waste heat utilization to the flue gas afterwards, and the flue gas after waste heat utilization is discharged into the atmosphere after handling by flue gas processing system. The calciner system has two furnaces, the upper furnace is a modifying furnace, the lower furnace is a preheating furnace, and the schematic connecting pipeline between the two furnaces is the necking.
The invention can also adopt the following technical scheme:
in the above flexibly adjustable high-activity metakaolin preparation system, further, the flexibly adjustable high-activity metakaolin preparation system includes a first cooling system, the number of stages of a cyclone cooler of the first cooling system is one, the temperature of a material exiting the cyclone cooler of the first cooling system is 500 to 650 ℃, the material enters a second cooling system for secondary cooling, the temperature of a gas exiting the cyclone cooler of the first cooling system is 500 to 650 ℃, and the gas enters the calciner system as combustion air for fuel combustion.
The number of stages of the cyclone cooler of the first cooling system is one, and the cyclone cooler is used for realizing primary cooling of hot materials entering the first cooling system. The first cooling system comprises a primary cyclone cooler, a high-efficiency material scattering device, a connecting pipeline and the like. The hot materials are rapidly cooled and separated from gas and solid in the cyclone cooler of the first cooling system, and the materials rapidly cooled by the first cooling system are subjected to gas-solid separation and then enter the second cooling system from the cyclone cooler of the first cooling system.
In the flexibly adjustable high-activity metakaolin preparation system, further, the flexibly adjustable high-activity metakaolin preparation system comprises a second cooling system, the number of stages of cyclone coolers of the second cooling system is one-four, the temperature of the material discharged from the lowest stage cyclone cooler of the second cooling system is about 100 ℃ (50-150 ℃), and then the material is conveyed to a finished product workshop through a zipper machine, and the gas temperature discharged from the highest stage cyclone cooler of the second cooling system is 200-300 ℃; when the color of a metakaolin finished product needs to be controlled, air subjected to heat exchange leaves from an air outlet of a cyclone cooler at the uppermost stage of the second cooling system, then enters a dust collector for dust removal, and the air subjected to dust collection is subjected to waste heat utilization firstly and then is discharged into the atmosphere through a chimney; when the color of the metakaolin finished product does not need to be controlled, the air subjected to heat exchange leaves from an air outlet of the uppermost stage cyclone cooler of the second cooling system, then is dedusted by a dust collector, and the air subjected to dust collection is divided into two paths: one path of the flue gas is firstly subjected to waste heat utilization, and the flue gas subjected to waste heat utilization is discharged into the atmosphere through a chimney. And the other path enters the cyclone cooler of the first cooling system, and then the hot material entering the first cooling system is cooled.
The number of stages of the cyclone cooler of the second cooling system is one-four, and the cyclone cooler is used for realizing secondary cooling of hot materials entering the second cooling system. The second cooling system comprises a one-stage or multi-stage cyclone cooler, a high-efficiency material scattering device, a connecting pipeline and the like. The material further realizes cooling and gas-solid separation in the cyclone cooler of the second cooling system, finally leaves from the blanking pipe of the lowest stage cyclone cooler of the second cooling system, falls into a finished product zipper machine, and finally obtains a finished product meeting the requirement.
In the flexibly adjustable high-activity metakaolin preparation system, further, an outlet of a cyclone cooler of the first cooling system is connected with the upper part of the modification furnace through a pipeline A, the pipeline A is provided with a valve A, the lowest stage cyclone preheater of the suspension preheating system is connected with an inlet of the cyclone cooler of the first cooling system through a pipeline B, a cone or a cylinder of the pipeline B or the cyclone cooler is connected with a water spray pipe, the water spray pipe is provided with a valve B, an inlet of the cyclone cooler of the first cooling system is communicated with cooling air through a pipeline C, the pipeline C is provided with a valve C, an outlet of a dust collector of the second cooling system is connected with the inlet of the cyclone cooler of the first cooling system through a pipeline D, and the pipeline D is provided with a valve D.
In the flexibly adjustable high-activity metakaolin preparation system, an emergency buffer bin is further arranged at the bottom of the cooling air inlet pipe of the second cooling system.
In order to avoid material collapse risk caused by sudden power failure or other faults of the system in the production process, the bottom of the cooling air inlet of the second cooling system is provided with an emergency buffer bin, when the system is suddenly powered off or has other faults, a valve on the emergency buffer bin is opened, and the finished product metakaolin is discharged into the finished product zipper machine through the emergency buffer bin, so that the safety of the system is guaranteed.
In the flexibly adjustable high-activity metakaolin preparation system, further, a plurality of temperature measuring points are arranged in layers in the height direction of the preheating furnace and the modification furnace.
The temperature distribution in the preheating furnace and the modifying furnace is monitored in real time by arranging a plurality of temperature measuring points in a layering manner in the height direction of the preheating furnace and the modifying furnace, the temperature distribution in the preheating furnace and the modifying furnace is controlled within a reasonable range by adjusting the amount of fuel and the amount of material fed into the preheating furnace and the modifying furnace, the reasonable temperature distribution in the preheating furnace and the modifying furnace can ensure the full combustion of the fuel and the full decomposition of kaolin, simultaneously ensure that the kaolin is not over-burnt, and the activity of the finished metakaolin meets the requirements of subsequent production.
A flexibly adjustable high-activity metakaolin preparation method, which uses any one of the flexibly adjustable high-activity metakaolin preparation systems.
In conclusion, the invention has the following advantages and positive effects:
1. the invention provides a flexibly adjustable high-activity metakaolin preparation system in consideration of different color requirements of different industries on metakaolin finished products. When the color of the metakaolin finished product needs to be controlled, the invention creates local reducing atmosphere and ensures that fuel is fully burnt out by regionally supplying air in the calcining furnace system, and simultaneously, the thermal material is quenched by normal-temperature air and cooling water, thereby realizing the control of the color of the metakaolin finished product. When the color of the metakaolin finished product does not need to be controlled, according to the amount of combustion-supporting media required by the calcining furnace system, the air subjected to heat exchange of the second cooling system is circulated to the first cooling system according to the designed proportion, so that the heat recovery of the part of hot air is realized, the heat consumption of the system can be effectively reduced, and the production cost is reduced.
2. The calcining furnace system provided by the invention is provided with the preheating furnace and the modification furnace, the two areas play different technical roles, the preheating furnace mainly realizes the combustion of fuel, the modification furnace mainly realizes the dehydration modification of kaolin, the fuel combustion is realized through the two areas, the temperature distribution in the preheating furnace and the modification furnace is controlled within a reasonable range by adjusting the fuel quantity and the material quantity fed into the preheating furnace and the modification furnace, the full combustion of the fuel and the full decomposition of the kaolin can be ensured, the local high temperature is avoided, the direct radiation contact of high-temperature flame with the kaolin is avoided, the kaolin is ensured not to be over-burnt, and the activity of a finished product meets the requirements of subsequent production.
3. The invention is provided with a first cooling system and a second cooling system from top to bottom in sequence, and the two systems have definite functional positioning. If only the first cooling system or the second cooling system is arranged, the problems that fuel combustion is incomplete, kaolin is not sufficiently decomposed, the temperature of a metakaolin finished product is too high to meet the requirement of subsequent production, the number of stages of cyclone coolers of the first cooling system is too large, the number of stages of cyclone coolers of the second cooling system is too large, the heat consumption and investment cost of the system are too high, the color of the metakaolin finished product cannot be controlled and the like can be faced.
4. The first cooling system and the second cooling system are relatively independent, and can adopt parallel connection, series connection or other connection modes according to the actual situation of a production site, the system arrangement can utilize the existing space of the production site to the maximum extent, and the influence on the production site can be reduced to the minimum degree.
5. In order to avoid the material collapse risk caused by sudden power failure or other faults of the system in the production process, the emergency buffer bin is arranged at the bottom of the cooling air inlet pipe of the second cooling system, when the system is suddenly powered off or has other faults, a valve on the emergency buffer bin is opened, and metakaolin finished products are discharged into the finished product zipper machine through the emergency buffer bin, so that the safety of the system is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a first embodiment and a second embodiment of the present invention.
In the figure:
1-1, 1-2, 1-3, 1-4, 1-5 and a fifth cyclone preheater of the suspension preheating system;
2-1, a preheating furnace, 2-2 and a modification furnace;
3-1, a sixth cyclone cooler of the first cooling system;
4-1, a seventh cyclone cooler of the second cooling system, 4-2 and an eighth cyclone cooler of the second cooling system; 4-3 parts of a dust collector, 4-4 parts of a finished zipper machine, 4-5 parts of an emergency buffer bin;
5-1, valves A,5-2, valves B,5-3, valves C,5-4 and valve D.
Detailed Description
The present invention will be specifically described with reference to fig. 1.
The principle of the invention is as follows:
in the preferred calcining temperature of the calcining furnace, the kaolin can be fully decomposed to form metakaolin, and the metakaolin can be prevented from being crystallized, separated and inactivated. In the process of decomposing the metakaolin to form the metakaolin, when the color of the metakaolin finished product needs to be controlled, firstly, the reducing atmosphere in the calcining furnace needs to be controlled, the invention carries out subarea feeding on the combustion-supporting air entering the calcining furnace, and the specific scheme is as follows: by adjusting a valve A, most of combustion-supporting air (with the preferred proportion of 50-90%) is blown into a preheating furnace, a local reducing atmosphere is created at the lower part of a calcining furnace system, and a small part of combustion-supporting air (with the preferred proportion of 10-50%) is blown into the middle part or the upper part of a modifying furnace, so that the full combustion of fuel is ensured; next, metakaolin needs to be quenched to below 600 ℃. Considering that the temperature difference between the normal temperature air and the hot material entering the first cooling system is large, the first-stage quenching of the hot material can be realized, so the invention adopts the normal temperature air with wide sources to cool the hot material entering the first cooling system, and through detailed theoretical calculation, the quenching of the hot material to 450-550 ℃ can be realized by adjusting the valve C. In order to further ensure the quenching effect, after the normal temperature air carries out primary quenching on the hot material, the invention arranges a cooling water channel on an air inlet pipe of a cyclone cooler of a first cooling system or a cone, a cylinder or other parts suitable for arranging the cooling water channel, and further reduces the temperature of the hot material cooled by the second path of normal temperature air by blowing a proper amount of cooling water, thereby ensuring the quenching effect on metakaolin. The specific scheme is as follows: the water spraying amount is controlled through the valve B, water is not sprayed when the valve B is closed, and the larger the opening degree of the valve B is, the larger the water spraying amount is. When the color of the metakaolin finished product does not need to be controlled, the reducing atmosphere does not need to be created in the calcining furnace system, and the metakaolin does not need to be subjected to quenching treatment, at the moment, the valve A can be closed, and all air subjected to heat exchange by the first cooling system enters the calcining furnace system through the preheating furnace. Meanwhile, considering that the air temperature of the uppermost-stage cyclone separator of the second cooling system is higher and the air volume is larger, in order to reduce the overall heat consumption of the system, the invention circulates part of air (the air volume is enough for the normal combustion of fuel in the calcining furnace system) out of the uppermost-stage cyclone separator of the second cooling system into the cyclone cooler of the first cooling system, thereby realizing the waste heat utilization of the part of air.
In the process, the pretreated raw meal powder enters a suspension preheating system through a raw meal elevator by a feeding device, preheating and gas-solid separation are realized in a multi-stage cyclone preheater of the suspension preheating system, and the fully preheated raw meal powder enters a calciner system from a penultimate cyclone preheater of the suspension preheating system. The method comprises the steps that a large amount of heat is released by fuel combustion in a calciner system to decompose kaolin, decomposed hot materials leave the calciner system, then the hot materials and hot flue gas are subjected to gas-solid separation in a lowest stage cyclone preheater of a suspension preheating system and then enter a first cooling system, the hot materials are subjected to cooling and gas-solid separation in a cyclone cooler of the first cooling system, the materials cooled by the first cooling system are subjected to gas-solid separation and then enter a second cooling system from a discharging pipe of the lowest stage cyclone cooler of the first cooling system, the materials are further subjected to cooling and gas-solid separation in the cyclone cooler of the second cooling system, finally the materials leave from the discharging pipe of the lowest stage cyclone cooler of the second cooling system and fall into a finished product zipper machine, and finally required finished products are obtained.
For a further understanding of the invention, its nature and utility, reference should be made to the following examples, taken in conjunction with the accompanying drawings, in which:
example 1
In this embodiment, the suspension preheating system includes a first, a second, a third, a fourth and a fifth cyclone preheater, a high-efficiency material scattering device and a connecting pipeline; the calcining furnace system comprises a high-efficiency material scattering device, a hot air inlet pipeline, a preheating furnace, a first combustor arranged at the cone part of the preheating furnace, a modifying furnace, a second combustor arranged at the cone part of the modifying furnace, a third combustor arranged at the middle part of the modifying furnace, a smoke outlet pipeline and the like; the first cooling system comprises a sixth cyclone cooler, a high-efficiency material scattering device, a connecting pipeline and the like; the second cooling system comprises a seventh cyclone cooler, an eighth cyclone cooler, a high-efficiency material scattering device, a connecting pipeline and the like.
As shown in fig. 1, kaolin crude ore enters a grinding system after being subjected to a pretreatment process, so that raw material powder meeting production requirements is obtained. Raw meal powder is fed into the suspension preheating system through a raw meal elevator by a feeding device, preheating and gas-solid separation are realized in the cyclone preheater, and the raw meal powder enters the calcining furnace system from the fourth cyclone preheater after multiple times of heat exchange and gas-solid separation. The fuel proportion and the material proportion of the preheating furnace and the modification furnace of the feeding calcining furnace system are adjusted through the material distributing valve, the temperature distribution in the preheating furnace and the modification furnace is controlled within the range of 650-1000 ℃, the reasonable temperature distribution in the preheating furnace and the modification furnace can ensure the full combustion of the fuel and the full decomposition of the kaolin, simultaneously ensure that the kaolin is not over-burnt, and the activity of the finished product meets the requirements of the subsequent production. The method comprises the steps that a large amount of heat is released by fuel combustion in a calcining furnace system to decompose kaolin, decomposed hot materials leave the calcining furnace system, then the hot materials and hot flue gas are subjected to gas-solid separation in a fifth cyclone preheater and enter a first cooling system, the hot materials are subjected to cooling and gas-solid separation in a cyclone cooler of the first cooling system, the materials cooled by the first cooling system are subjected to gas-solid separation and then enter a second cooling system from a feeding pipe of a sixth cyclone cooler, the materials are further subjected to cooling and gas-solid separation in the cyclone cooler of the second cooling system, finally the materials leave from a feeding pipe of a seventh cyclone cooler and fall into a finished product zipper machine, and a finished product meeting the requirement is obtained. In order to avoid material collapse risk caused by sudden power failure or other faults of the system in the production process, the bottom of the cooling air inlet of the second cooling system is provided with an emergency buffer bin, when the system is suddenly powered off or has other faults, a valve on the emergency buffer bin is opened, and metakaolin finished products are discharged into the finished product zipper machine through the emergency buffer bin, so that the safety of the system is guaranteed.
Valves a, B and C are closed and valve D is open. According to the gas flow direction, normal temperature air enters a second cooling system, materials entering the second cooling system are cooled, air after heat exchange is completed leaves from an air outlet of a cyclone cooler at the top level of the second cooling system, then dust is removed by a dust collector, and the air after dust collection is divided into two paths: one path of the system firstly utilizes waste heat, the flue gas after the waste heat utilization is discharged into the atmosphere through a chimney, the other path of the flue gas enters a cyclone cooler of the first cooling system, and then the hot material entering the first cooling system is cooled. And the air after heat exchange enters a calciner system through a preheating furnace. Flue gas formed by fuel combustion and kaolin decomposition in the calcining furnace system leaves the calcining furnace system and enters the suspension preheating system, then raw meal powder fed into the suspension preheating system is subjected to multiple preheating and gas-solid separation, finally leaves from an air outlet of a primary cyclone preheater at the top of the suspension preheating system, then waste heat of the flue gas is utilized, and the flue gas after waste heat utilization is treated by the flue gas treatment system and then is discharged into the atmosphere.
Example 2
In this embodiment, the suspension preheating system includes a first, a second, a third, a fourth and a fifth cyclone preheater, a high-efficiency material scattering device and a connecting pipeline; the calcining furnace system comprises a high-efficiency material scattering device, a hot air inlet pipeline, a preheating furnace, a first combustor arranged at the cone part of the preheating furnace, a modifying furnace, a second combustor arranged at the cone part of the modifying furnace, a third combustor arranged at the middle part of the modifying furnace, a smoke outlet pipeline and the like; the first cooling system comprises a sixth cyclone cooler, a high-efficiency material scattering device, a connecting pipeline and the like; the second cooling system comprises a seventh cyclone cooler, an eighth cyclone cooler, a high-efficiency material scattering device, a connecting pipeline and the like.
As shown in fig. 1, kaolin crude ore enters a grinding system after being subjected to a pretreatment process, so that raw material powder meeting production requirements is obtained. Raw meal powder is fed into the suspension preheating system through a raw meal elevator by a feeding device, preheating and gas-solid separation are realized in the cyclone preheater, and the raw meal powder enters the calcining furnace system from the fourth cyclone preheater after multiple times of heat exchange and gas-solid separation. The temperature distribution in the preheating furnace and the modification furnace is controlled within a reasonable range by adjusting the fuel proportion and the material proportion of the preheating furnace and the modification furnace of the feeding calcining furnace system, the reasonable temperature distribution in the preheating furnace and the modification furnace can ensure the full combustion of the fuel and the full decomposition of the kaolin, simultaneously ensure that the kaolin is not over-burnt, and the activity of the finished product meets the requirements of the subsequent production. The method comprises the steps that a large amount of heat is released by fuel combustion in a calciner system to decompose kaolin, decomposed hot materials leave the calciner system, then the hot materials and hot flue gas are subjected to gas-solid separation in a fifth cyclone preheater and then enter a first cooling system, the hot materials are subjected to cooling and gas-solid separation in a cyclone cooler of the first cooling system, the materials cooled by the first cooling system are subjected to gas-solid separation and then enter a second cooling system from a feeding pipe of a sixth cyclone cooler, the materials are further subjected to cooling and gas-solid separation in the cyclone cooler of the second cooling system, finally the materials leave from a feeding pipe of a seventh cyclone cooler and fall into a finished product zipper machine, and a finished product meeting the requirement is obtained. In order to avoid material collapse risk caused by sudden power failure or other faults of the system in the production process, the bottom of the cooling air inlet of the second cooling system is provided with an emergency buffer bin, when the system is suddenly powered off or has other faults, a valve on the emergency buffer bin is opened, and metakaolin finished products are discharged into the finished product zipper machine through the emergency buffer bin, so that the safety of the system is guaranteed.
Valves a, B and C are open and valve D is closed. According to the gas flow direction, the first path of normal temperature air enters a second cooling system, then the material entering the second cooling system is cooled, the air after heat exchange leaves from an air outlet of a cyclone cooler at the top stage of the second cooling system, then a dust collector removes dust, the air after dust collection is subjected to waste heat utilization firstly, and then the air is discharged into the atmosphere through a chimney; the second path of normal temperature air enters the cyclone cooler of the first cooling system, then the hot material entering the first cooling system is cooled, and the air after heat exchange is divided into the following two paths: the first path enters the calcining furnace system through the bottom of the preheating furnace, and the second path enters the calcining furnace system through the middle part or the upper part of the modification furnace. Flue gas formed by fuel combustion and kaolin decomposition in the calcining furnace system leaves the calcining furnace system and enters the suspension preheating system, then raw meal powder fed into the suspension preheating system is subjected to multiple preheating and gas-solid separation, finally leaves from an air outlet of a primary cyclone preheater at the top of the suspension preheating system, then waste heat of the flue gas is utilized, and the flue gas after waste heat utilization is treated by the flue gas treatment system and then is discharged into the atmosphere. In order to ensure the quenching effect of the metakaolin finished product, a cooling water channel is arranged on the air inlet pipe of the cyclone cooler of the first cooling system or the cone, the cylinder or other parts suitable for arranging the cooling water channel, and the temperature of the hot material cooled by the second path of normal temperature air is further reduced by blowing a proper amount of cooling water, so that the quenching effect on the metakaolin is ensured.
In conclusion, the invention provides a flexibly-adjustable high-activity metakaolin preparation system and a preparation method, which fully consider the color requirements of different industries on metakaolin finished products, produce metakaolin with high activity, and solve the problems of high energy consumption, low processing capacity, difficult control of product quality and the like of a metakaolin preparation system.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. A high activity metakaolin preparation system that can adjust in a flexible way which characterized in that: the flexibly adjustable high-activity metakaolin preparation system comprises a suspension preheating system, the number of stages of a cyclone preheater of the suspension preheating system is three-seven, raw meal powder is preheated in the cyclone preheater and is subjected to gas-solid separation, the raw meal powder subjected to multiple heat exchanges and gas-solid separation enters a calciner system from the last-but-two stage cyclone preheater of the suspension preheating system, the calcining temperature in the calciner system is 650-1000 ℃, the gas retention time in the calciner system is 2-10 seconds, the calciner system comprises a preheating furnace and a modifying furnace, the calciner system comprises a first combustor arranged on the cone part of the preheating furnace, a second combustor arranged on the cone part of the modifying furnace and a third combustor in the middle of the modifying furnace, a reducing port is arranged between the preheating furnace and the modifying furnace, and hot materials leaving the calciner system enter a first cooling system and a second cooling system after being subjected to gas-solid separation with hot smoke gas in the last stage cyclone preheater of the suspension preheating system;
an outlet of a cyclone cooler of the first cooling system is connected with the upper part of the modifying furnace through a pipeline A, a valve A is arranged on the pipeline A, the lowest stage cyclone preheater of the suspension preheating system is connected with an inlet of the cyclone cooler of the first cooling system through a pipeline B, a cone or a cylinder of the pipeline B or the cyclone cooler is connected with a water spray pipe, the water spray pipe is provided with the valve B, an inlet of the cyclone cooler of the first cooling system is introduced with cooling air through a pipeline C, the pipeline C is provided with a valve C, an outlet of a dust collector of the second cooling system is connected with the inlet of the cyclone cooler of the first cooling system through a pipeline D, and the pipeline D is provided with a valve D;
when the valves A, B and C are closed, the valve D is opened, normal-temperature air enters the second cooling system, air which is discharged from the second cooling system is divided into two paths, wherein one path enters the cyclone cooler of the first cooling system, then the hot material which enters the first cooling system is cooled, and the air which is subjected to heat exchange enters the calcining furnace system through the preheating furnace;
when the valves A, B and C are opened, the valve D is closed, the first path of normal temperature air enters the second cooling system, and the air out of the second cooling system is discharged into the atmosphere through a chimney after dust removal and waste heat utilization; and the second path of normal temperature air enters a cyclone cooler of the first cooling system, the air after heat exchange is divided into two paths, the first path enters a calcining furnace system through the bottom of the preheating furnace, and the second path enters the calcining furnace system through the middle part or the upper part of the modification furnace.
2. The system for preparing flexibly regulated highly reactive metakaolin according to claim 1, wherein: the flexibly-adjustable high-activity metakaolin preparation system comprises a first cooling system, wherein the number of stages of a cyclone cooler of the first cooling system is one, the temperature of a material discharged from the cyclone cooler of the first cooling system is 500-650 ℃, then the material enters a second cooling system for secondary cooling, the temperature of gas discharged from the cyclone cooler of the first cooling system is 500-650 ℃, and then the gas enters a calciner system to serve as combustion-supporting air for fuel combustion.
3. The system for preparing flexibly regulated highly reactive metakaolin according to claim 1, wherein: the flexibly-adjustable high-activity metakaolin preparation system comprises a second cooling system, wherein the number of stages of cyclone coolers of the second cooling system is one-four, the temperature of materials discharged from the cyclone cooler at the lowest stage of the second cooling system is 50-150 ℃, then the materials are conveyed to a finished product workshop through a zipper machine, and the temperature of gas discharged from the cyclone cooler at the highest stage of the second cooling system is 200-300 ℃; when the color of a metakaolin finished product needs to be controlled, air subjected to heat exchange leaves from an air outlet of a cyclone cooler at the uppermost stage of the second cooling system, then enters a dust collector for dust removal, and the air subjected to dust collection is subjected to waste heat utilization firstly and then is discharged into the atmosphere through a chimney; when the color of the metakaolin finished product does not need to be controlled, the air subjected to heat exchange leaves from an air outlet of the uppermost stage cyclone cooler of the second cooling system, then is dedusted by a dust collector, and the air subjected to dust collection is divided into two paths: one path of the flue gas is firstly subjected to waste heat utilization, and the flue gas subjected to waste heat utilization is discharged into the atmosphere through a chimney; and the other path enters the cyclone cooler of the first cooling system, and then the hot material entering the first cooling system is cooled.
4. The system for preparing flexibly regulated highly reactive metakaolin according to claim 1, wherein: and an emergency buffer bin is arranged at the bottom of the cooling air inlet pipe of the second cooling system.
5. A preparation method of flexibly adjustable high-activity metakaolin is characterized by comprising the following steps: the method for preparing the flexibly adjustable high-activity metakaolin uses the flexibly adjustable high-activity metakaolin preparation system as set forth in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110118219.1A CN112939002B (en) | 2021-01-28 | 2021-01-28 | Flexibly-adjustable high-activity metakaolin preparation system and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110118219.1A CN112939002B (en) | 2021-01-28 | 2021-01-28 | Flexibly-adjustable high-activity metakaolin preparation system and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112939002A CN112939002A (en) | 2021-06-11 |
| CN112939002B true CN112939002B (en) | 2023-01-31 |
Family
ID=76238604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110118219.1A Active CN112939002B (en) | 2021-01-28 | 2021-01-28 | Flexibly-adjustable high-activity metakaolin preparation system and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112939002B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113883898A (en) * | 2021-10-15 | 2022-01-04 | 天津水泥工业设计研究院有限公司 | Suspension calcining device and process suitable for high-iron-content kaolin raw material |
| CN113929335B (en) * | 2021-10-15 | 2023-03-21 | 天津水泥工业设计研究院有限公司 | Finished product color-controllable metakaolin preparation system and preparation method |
| CN113865346A (en) * | 2021-10-15 | 2021-12-31 | 天津水泥工业设计研究院有限公司 | Kaolin calcination cooling system and method with controllable finished product color |
| CN115448697A (en) * | 2022-09-07 | 2022-12-09 | 内蒙古先进陶瓷设计院有限公司 | Active ceramic powder and preparation process thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4094626A (en) * | 1976-11-23 | 1978-06-13 | Fuller Company | Apparatus for producing cement clinker |
| US5132102A (en) * | 1989-12-21 | 1992-07-21 | Fuller Company | Method for heat treatment of fines with atmosphere control |
| CN106568331B (en) * | 2016-10-19 | 2018-08-21 | 中冶焦耐(大连)工程技术有限公司 | A kind of large size suspension kiln and its production technology |
| CN109776002B (en) * | 2019-03-06 | 2024-01-19 | 中国中材国际工程股份有限公司 | Suspension calcination activation system and method suitable for clay mine tailings |
| CN110220386A (en) * | 2019-06-04 | 2019-09-10 | 苏州中材非金属矿工业设计研究院有限公司 | A kind of kaolin powder pre-heating system and kaolin powder calcination system and method for calcinating comprising it |
| CN111847466A (en) * | 2020-08-24 | 2020-10-30 | 合肥水泥研究设计院有限公司 | Black talc powder suspension calcining and whitening device and process |
-
2021
- 2021-01-28 CN CN202110118219.1A patent/CN112939002B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112939002A (en) | 2021-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112939002B (en) | Flexibly-adjustable high-activity metakaolin preparation system and preparation method | |
| CN112897541B (en) | High-activity metakaolin preparation system and preparation method | |
| CN114524631B (en) | Kaolin suspension calcining system based on cement clinker sintering system improvement | |
| CN112897542B (en) | Process and device for low-temperature rapid calcination modification of kaolin | |
| CN110498622B (en) | Method for decomposing and calcining calcium oxide outside multistage suspension preheating kiln for powder | |
| CN113929335B (en) | Finished product color-controllable metakaolin preparation system and preparation method | |
| US4569831A (en) | Process and apparatus for calcining gypsum | |
| CN101318632B (en) | Method for decomposing phosphogypsum to produce sulphuric acid and cement with suspended state | |
| CN108164161B (en) | High-activity magnesium oxide suspension state calcination system and magnesium oxide preparation method | |
| CN113816390A (en) | Preparation system and preparation method of high-activity metakaolin with controllable finished product color | |
| CN110803877A (en) | Device and method for producing II type anhydrous gypsum from desulfurized gypsum | |
| CN111977995A (en) | Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system | |
| CN212669567U (en) | Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system | |
| WO2021103736A1 (en) | Device and method for producing type-ii anhydrite by means of thermal coupling | |
| CN217127294U (en) | Carbide slag suspension calcining system | |
| CN104003633B (en) | Preparation method of silicate clinker and cement and rotary kiln for preparing silicate clinker | |
| CN109836059A (en) | A kind of transformation cement kiln lime production device and method | |
| CN108910836A (en) | A kind of technique and device of gypsum Sulphuric acid coproduction lime | |
| CN212504610U (en) | Device for preparing light-burned magnesia and enriching carbon dioxide by self-circulation pyrolysis of flue gas | |
| CN111777340A (en) | Device for preparing light-burned magnesia and enriching carbon dioxide by self-circulation pyrolysis of flue gas | |
| CN113865346A (en) | Kaolin calcination cooling system and method with controllable finished product color | |
| CN113045224B (en) | System and method for preparing powdery active lime by modifying cement clinker production line | |
| CN115353308A (en) | Clay ore suspension calcining system and process flow | |
| CN114772559A (en) | Separated dual system and production method for preparing sulfuric acid and co-producing cement from phosphogypsum | |
| CN114956610A (en) | Carbide slag suspension calcining system |
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 |