CN115353308A - Clay ore suspension calcining system and process flow - Google Patents
Clay ore suspension calcining system and process flow Download PDFInfo
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- CN115353308A CN115353308A CN202211027699.1A CN202211027699A CN115353308A CN 115353308 A CN115353308 A CN 115353308A CN 202211027699 A CN202211027699 A CN 202211027699A CN 115353308 A CN115353308 A CN 115353308A
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- 238000001354 calcination Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 20
- 239000000725 suspension Substances 0.000 title claims abstract description 19
- 239000004927 clay Substances 0.000 title claims description 15
- 238000001816 cooling Methods 0.000 claims abstract description 143
- 239000000463 material Substances 0.000 claims description 47
- 230000001174 ascending effect Effects 0.000 claims description 34
- 239000000779 smoke Substances 0.000 claims description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 23
- 239000003546 flue gas Substances 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 18
- 239000002734 clay mineral Substances 0.000 claims description 13
- 239000002912 waste gas Substances 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000002803 fossil fuel Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- C04B7/44—Burning; Melting
-
- 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
- C04B7/364—Avoiding environmental pollution during cement-manufacturing
- C04B7/367—Avoiding or minimising carbon dioxide emissions
-
- 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
- C04B7/432—Preheating without addition of fuel
-
- 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
-
- 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
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Abstract
The invention relates to a suspension calcining system and a process flow for clayey ores, and belongs to the technical field of calcining in the cement industry. Comprises a preheating cyclone cylinder, a decomposing furnace, a cooling cyclone cylinder, a conveying reamer and a fan; the preheating cyclone cylinder comprises a primary preheating cyclone cylinder, a secondary preheating cyclone cylinder and a tertiary preheating cyclone cylinder; the cooling cyclone cylinder comprises a cooling primary cyclone cylinder, a cooling secondary cyclone cylinder and a cooling tertiary cyclone cylinder; the fan comprises a system fan and a cooling fan; the cooling cyclone cylinder and the cooling fan form a cooling system; the preheating cyclone cylinder, the decomposing furnace and the system fan form a preheating calcining system. The invention can obviously reduce the emission of carbon dioxide and simultaneously ensure the performance of the produced cement to be unchanged, and is an important technical scheme for energy conservation and emission reduction in the cement industry at present.
Description
Technical Field
The invention relates to a suspension calcining system and a process flow for clayey ores, and belongs to the technical field of calcining in the cement industry.
Background
Climate change has seriously threatened the sustainable development of mankind, and becomes a great challenge facing the global climate change. The low-carbon economy is widely concerned internationally and domestically. At present, low-carbon economy is taken as one of effective ways for realizing ecological economy and green economy, and is taken as an important component of circular economy by various countries as a necessary way for meeting the challenges of climate, environment and energy change and a common direction for realizing economic transformation and sustainable development. The aluminosilicate mineral is a main body forming the earth crust and is also an ancient cementing material, the activation temperature of the aluminosilicate mineral is basically below 850 ℃, which is far lower than the calcination temperature of the silicate cement clinker, the energy consumption is greatly reduced, and the carbon emission is greatly reduced; essentially no limestone is used during the activation of the aluminosilicate mineral and therefore essentially no carbon emissions are generated. It can be expected that if the activated aluminosilicate material can be directly prepared to replace the clinker of the traditional water machine, the emission of carbon dioxide can be reduced by 40 percent to the maximum when the clinker replacement rate reaches 30 percent.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a suspension calcining system and a process flow for clayey ores, which are used for improving the production efficiency of the system and reducing the heat consumption.
In order to realize the technical purpose, the invention adopts the following scheme:
a clayey ore suspension calcining system comprises a preheating cyclone, a decomposing furnace, a cooling cyclone, a conveying reamer and a fan; the preheating cyclone cylinder comprises a primary preheating cyclone cylinder, a secondary preheating cyclone cylinder and a tertiary preheating cyclone cylinder; the cooling cyclone cylinder comprises a cooling primary cyclone cylinder, a cooling secondary cyclone cylinder and a cooling tertiary cyclone cylinder; the fan comprises a system fan and a cooling fan; the cooling cyclone cylinder and the cooling fan form a cooling system; the preheating cyclone cylinder, the decomposing furnace and the system fan form a preheating calcining system;
wherein, the outlet of the primary preheating cyclone cylinder is connected with one end of a system fan; a smoke ascending pipeline and a blanking pipeline are arranged between the primary preheating cyclone and the secondary preheating cyclone; the flue gas ascending pipeline is connected between the top of the primary preheating cyclone and the top of the secondary preheating cyclone; the blanking pipeline is connected between the bottom of the primary preheating cyclone and the top of the secondary preheating cyclone; the clayey ore raw material is communicated with the flue gas ascending pipeline through a conveying pipeline; the flue gas ascending pipeline is also connected between the top of the secondary preheating cyclone and the top of the tertiary preheating cyclone; the bottom of the secondary preheating cyclone cylinder is connected with the decomposing furnace through a discharging pipeline; the top of the decomposing furnace is connected with the top of the three-stage preheating cyclone through a flue gas ascending pipeline, the bottom of the decomposing furnace is connected with the top of the cooling first-stage cyclone through a flue gas ascending pipeline and a discharging pipeline, and the bottom of the three-stage preheating cyclone is also connected with the top of the cooling first-stage cyclone through a discharging pipeline; the bottom of the cooling primary cyclone cylinder is connected with the top of the cooling secondary cyclone cylinder through a discharging pipeline; the bottom of the cooling secondary cyclone cylinder is connected with the top of the cooling tertiary cyclone cylinder through a blanking pipeline, and the top of the cooling tertiary cyclone cylinder is connected with the top of the cooling secondary cyclone cylinder through a flue gas ascending pipeline; the top of the cooling secondary cyclone cylinder is connected with one end of a cooling fan through a flue gas ascending pipeline; the other end of the cooling fan is divided into two bypasses, and one bypass is communicated with the top of the cooling primary cyclone cylinder; the other bypass is converged with a waste gas pipeline connected with the other end of the system fan; the top of the cooling tertiary cyclone cylinder is directly communicated with cold air, the bottom of the cooling tertiary cyclone cylinder is connected with one end of a conveying reamer through a discharging pipeline, and the other end of the conveying reamer is sequentially connected with conveying equipment and a storage.
Further, a secondary combustion device is arranged on the merged waste gas pipeline and used for removing carbon monoxide which is not completely combusted in the decomposition and decomposition furnace.
Further, the decomposing furnace is connected with a fuel interface or an external furnace.
Further, the fuel interface accesses traditional fossil fuels; and the external hanging furnace is connected with AFR (atomic fluorescence reactor) substitute fuel.
Furthermore, the bottoms of the primary preheating cyclone, the secondary preheating cyclone, the tertiary preheating cyclone, the cooling secondary cyclone and the cooling tertiary cyclone are provided with air locking valves.
Furthermore, the primary preheating cyclone and the cooling secondary cyclone are both high-efficiency dust collection double-cyclone cylinders.
Furthermore, the system fan and the cooling fan are both connected with a motor.
Further, the feeding granularity of the clayey ore raw material in the conveying pipeline is less than 200um.
The process flow of the suspension calcining system for the clayey ores comprises the following steps:
the method comprises the following steps: the pulverized and dried clay mineral materials are fed into a flue gas ascending pipeline between a primary preheating cyclone and a secondary preheating cyclone through a conveying pipeline;
step two: clay mineral materials fed into the primary preheating cyclone and the secondary preheating cyclone enter the primary preheating cyclone along with the smoke ascending pipeline and the smoke, in the process, the materials and the smoke exchange heat, the temperature of high-temperature smoke from the secondary preheating cyclone is reduced, the temperature of the materials is heated and increased, the materials are collected in the primary preheating cyclone, and the materials are fed into the secondary preheating cyclone through a discharging pipeline; meanwhile, a smoke ascending pipeline is connected with the secondary preheating cyclone cylinder and the tertiary preheating cyclone cylinder, the materials exchange heat with the smoke again, and the hot materials are collected by the secondary preheating cyclone cylinder and fed into a decomposing furnace for calcination;
step three: the lower part of the decomposing furnace is connected with the cooling cyclone, and cooling air for cooling the burnt material is changed into high-temperature gas for combustion air of the decomposing furnace through heat exchange; an outlet at the top of the decomposing furnace is connected with the three-stage preheating cyclone and used for collecting the calcined material in the decomposing furnace, and the calcined material is fed into a cooling fan through a feeding pipeline and is cooled in the cooling first-stage cyclone;
step four: high-temperature materials are fed into a cooling primary cyclone cylinder to start cooling and collection, the process is just opposite to the whole preheating process, the materials exchange heat with cold air among the cooling primary cyclone cylinder, the cooling secondary cyclone cylinder and a cooling tertiary cyclone cylinder, the cooling primary cyclone cylinder is used for rapidly cooling and calcining clay, the air volume is small, the reduction atmosphere in a decomposing furnace is favorably formed, and the color of a finished product is controlled; excessive cooling wind is adopted in the cooling secondary cyclone cylinder and the cooling tertiary cyclone cylinder to cool clay, so that the temperature of a finished product can be ensured, and redundant cooling hot wind bypasses a waste gas pipeline and is converged with waste gas of a preheating and calcining system to be used for drying clay mineral materials;
step five: and the cooled calcined clay collected by the cooling three-stage cyclone cylinder is connected with a conveying reamer through a blanking pipeline and conveyed into a storage by a series of conveying equipment.
Compared with the prior art, the invention has the beneficial effects that:
the invention is used for calcining clayey ore, the product can be used as a low-carbon cementing material to replace the traditional cement clinker, compared with the traditional cement clinker, the calcination temperature of the clay is lower, the required heat consumption is lower, and the carbon dioxide can not be decomposed in the dehydration process of the clay.
Drawings
The invention is further illustrated by the following figures.
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
An embodiment of the present invention is described in detail with reference to fig. 1.
The clay mineral suspension calcining system comprises a preheating cyclone, a decomposing furnace 4, a cooling cyclone, a conveying reamer 9 and a fan. The preheating cyclone cylinder comprises a primary preheating cyclone cylinder 1, a secondary preheating cyclone cylinder 2 and a tertiary preheating cyclone cylinder 3. The cooling cyclones include a cooling primary cyclone 6, a cooling secondary cyclone 7 and a cooling tertiary cyclone 8. The fans include a system fan 10 and a cooling fan 11. The cooling cyclone and the cooling fan 11 constitute a cooling system. The preheating cyclone, the decomposing furnace 4 and the system fan 10 form a preheating calcining system.
As shown in FIG. 1, the outlet of the primary preheating cyclone 1 is connected with one end of a system fan 10. A smoke ascending pipeline (a broken line is a smoke ascending path in the figure 1) and a blanking pipeline (a solid line is a material path in the figure 1) are arranged between the primary preheating cyclone 1 and the secondary preheating cyclone 2. The flue gas ascending pipeline is connected between the top of the primary preheating cyclone cylinder 1 and the top of the secondary preheating cyclone cylinder 2. The blanking pipeline is connected between the bottom of the primary preheating cyclone 1 and the top of the secondary preheating cyclone 2. The clayey ore raw material 300 is communicated with the flue gas ascending pipeline through a conveying pipeline, and the feeding granularity of the clayey ore raw material in the conveying pipeline is less than 200um. A flue gas ascending pipeline is also connected between the top of the secondary preheating cyclone 2 and the top of the tertiary preheating cyclone 3. The bottom of the secondary preheating cyclone 2 is connected with the decomposing furnace 4 through a discharging pipeline. In the embodiment, the decomposing furnace 4 is connected with the external furnace 5 and is accessed with AFR substituted fuel. The top of the decomposing furnace 4 is connected with the top of the tertiary preheating cyclone cylinder 3 through a smoke ascending pipeline, the bottom of the decomposing furnace 4 is connected with the top of the cooling primary cyclone cylinder 6 through a smoke ascending pipeline and a discharging pipeline, and the bottom of the tertiary preheating cyclone cylinder 3 is also connected with the top of the cooling primary cyclone cylinder 6 through a discharging pipeline. The bottom of the cooling primary cyclone 6 is connected with the top of the cooling secondary cyclone 7 through a blanking pipeline. The bottom of the cooling secondary cyclone cylinder 7 is connected with the top of the cooling tertiary cyclone cylinder 8 through a feeding pipeline, and the top of the cooling tertiary cyclone cylinder 8 is connected with the top of the cooling secondary cyclone cylinder 7 through a smoke ascending pipeline. The top of the cooling secondary cyclone cylinder 7 is connected with one end of a cooling fan 11 through a smoke ascending pipeline. The other end of the cooling fan 11 is divided into two bypasses, and one bypass is communicated with the top of the cooling primary cyclone cylinder 6. The other bypass merges with the exhaust duct connected to the other end of the system fan 10. The merged exhaust gas piping is provided with a secondary combustion device 12 for removing carbon monoxide which is not completely combusted in the decomposition furnace 4.
The top of the cooling tertiary cyclone cylinder 8 is directly communicated with cold air, the bottom of the cooling tertiary cyclone cylinder 8 is connected with one end of a conveying reamer 9 through a discharging pipeline, and the other end of the conveying reamer 9 is sequentially connected with conveying equipment and a storage.
In this embodiment, the bottom of the first-stage preheating cyclone 1, the second-stage preheating cyclone 2, the third-stage preheating cyclone 3, the cooling second-stage cyclone 7, and the cooling third-stage cyclone 8 are all provided with a wind lock valve 81. And the primary preheating cyclone cylinder 1 and the cooling secondary cyclone cylinder 7 are both high-efficiency dust collection double cyclone cylinders. Meanwhile, the system fan 10 and the cooling fan 11 are both connected to a motor M.
The process flow of the clayey ore suspension calcining system comprises the following steps:
the method comprises the following steps: the pulverized and dried clay mineral materials are fed into a flue gas ascending pipeline between a primary preheating cyclone cylinder 1 and a secondary preheating cyclone cylinder 2 through a conveying pipeline.
Step two: clay mineral materials fed into the primary preheating cyclone 1 and the secondary preheating cyclone 2 enter the primary preheating cyclone 1 along with the smoke ascending pipeline and the smoke, in the process, the materials and the smoke exchange heat, the temperature of high-temperature smoke from the secondary preheating cyclone 2 is reduced, the temperature of the materials is heated and increased, the materials are collected in the primary preheating cyclone 1, and the materials are fed into the secondary preheating cyclone 2 through the discharging pipeline. Meanwhile, a smoke ascending pipeline connected with the secondary preheating cyclone 2 and the tertiary preheating cyclone 3 exchanges heat with the smoke again, and hot materials are collected by the secondary preheating cyclone 2 and fed into a decomposing furnace 4 for calcination.
Step three: the lower part of the decomposing furnace 4 is connected with a cooling cyclone, and cooling air for cooling the burnt material is changed into high-temperature gas for combustion air of the decomposing furnace through heat exchange. The top outlet of the decomposing furnace 4 is connected with the three-stage preheating cyclone 3 and is used for collecting calcined materials in the decomposing furnace 4, feeding the calcined materials into the cooling fan 11 through a discharging pipeline and cooling the calcined materials in the cooling first-stage cyclone 6.
Step four: high-temperature materials are fed into the cooling primary cyclone cylinder 6 to be cooled and collected, the process is just opposite to the whole preheating process, the materials exchange heat with cold air among the cooling primary cyclone cylinder 6, the cooling secondary cyclone cylinder 7 and the cooling tertiary cyclone cylinder 8, the cooling primary cyclone cylinder 6 is used for quenching and calcining clay, the air volume is small, the forming of reducing atmosphere in the decomposing furnace 4 is facilitated, and the color of a finished product is controlled. Excessive cooling air is adopted in the cooling secondary cyclone 7 and the cooling tertiary cyclone 8 to cool clay, so that the temperature of a finished product can be ensured, and redundant cooling hot air bypasses a waste gas pipeline to be converged with waste gas of a preheating and calcining system to be used for drying clay mineral materials.
Step five: the cooled calcined clay collected by the cooling tertiary cyclone 8 is fed into a storage by a series of conveying devices, and the feeding pipeline of the calcined clay is connected with a conveying reamer 9.
The system is mainly characterized in that a double-fan system fan 10 and a cooling fan 11 are adopted to respectively control the pressure, the temperature and the air quantity of a preheating system and a cooling system, so that the whole system is simple to operate, and the pressure of the fans is low.
The embodiment can realize a novel suspension calcination process of the clay minerals, the pressure loss of the whole system is low, the heat consumption of the system can be reduced, and the produced calcined clay can partially replace the traditional cement clinker, thereby achieving the purposes of energy conservation and emission reduction.
In embodiment 2, in this embodiment, the decomposition furnace 4 is connected to a fuel interface and is supplied with conventional fossil fuel. Other connections and process steps are the same as in example 1 and will not be described in detail here.
In conclusion, although the embodiments of the present invention have been described, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principles and spirit of the present invention.
Claims (9)
1. A clayey ore suspension calcining system is characterized in that: comprises a preheating cyclone cylinder, a decomposing furnace (4), a cooling cyclone cylinder, a conveying reamer (9) and a fan; the preheating cyclone cylinder comprises a primary preheating cyclone cylinder (1), a secondary preheating cyclone cylinder (2) and a tertiary preheating cyclone cylinder (3); the cooling cyclone cylinder comprises a cooling primary cyclone cylinder (6), a cooling secondary cyclone cylinder (7) and a cooling tertiary cyclone cylinder (8); the fan comprises a system fan (10) and a cooling fan (11); the cooling cyclone cylinder and the cooling fan (11) form a cooling system; the preheating cyclone cylinder, the decomposing furnace (4) and the system fan (10) form a preheating calcining system;
wherein, the outlet of the primary preheating cyclone cylinder (1) is connected with one end of a system fan (10); a smoke ascending pipeline and a blanking pipeline are arranged between the primary preheating cyclone cylinder (1) and the secondary preheating cyclone cylinder (2); the flue gas ascending pipeline is connected between the top of the primary preheating cyclone (1) and the top of the secondary preheating cyclone (2); the blanking pipeline is connected between the bottom of the primary preheating cyclone (1) and the top of the secondary preheating cyclone (2); the clay mineral raw material is communicated with a flue gas ascending pipeline through a conveying pipeline; the flue gas ascending pipeline is also connected between the top of the secondary preheating cyclone (2) and the top of the tertiary preheating cyclone (3); the bottom of the secondary preheating cyclone (2) is connected with the decomposing furnace (4) through a discharging pipeline; the top of the decomposing furnace (4) is connected with the top of the three-stage preheating cyclone (3) through a flue gas ascending pipeline, the bottom of the decomposing furnace (4) is connected with the top of the cooling first-stage cyclone (6) through a flue gas ascending pipeline and a discharging pipeline, and the bottom of the three-stage preheating cyclone (3) is also connected with the top of the cooling first-stage cyclone (6) through a discharging pipeline; the bottom of the cooling primary cyclone (6) is connected with the top of the cooling secondary cyclone (7) through a discharging pipeline; the bottom of the cooling secondary cyclone (7) is connected with the top of the cooling tertiary cyclone (8) through a feeding pipeline, and the top of the cooling tertiary cyclone (8) is connected with the top of the cooling secondary cyclone (7) through a flue gas ascending pipeline; the top of the cooling secondary cyclone cylinder (7) is connected with one end of a cooling fan (11) through a flue gas ascending pipeline; the other end of the cooling fan (11) is divided into two bypasses, and one bypass is communicated with the top of the cooling primary cyclone cylinder (6); the other bypass is converged with a waste gas pipeline connected with the other end of the system fan (10); the top of the cooling tertiary cyclone (8) is directly communicated with cold air, the bottom of the cooling tertiary cyclone (8) is connected with one end of a conveying reamer (9) through a discharging pipeline, and the other end of the conveying reamer (9) is sequentially connected with conveying equipment and a storage.
2. The clay-ore suspension calcination system of claim 1, wherein: the merged waste gas pipeline is provided with a secondary combustion device (12) for removing carbon monoxide which is not completely combusted in the decomposition furnace (4).
3. The clay-ore suspension calcination system of claim 2, wherein: the decomposing furnace (4) is connected with the fuel interface or the external furnace (5).
4. The clay-ore suspension calcination system of claim 3, wherein: the fuel interface is connected with traditional fossil fuel; the external hanging furnace (5) is connected with AFR (atomic fluorescence reactor) substitute fuel.
5. The clay-ore suspension calcination system of claim 4, wherein: the bottom parts of the primary preheating cyclone cylinder (1), the secondary preheating cyclone cylinder (2), the tertiary preheating cyclone cylinder (3), the cooling secondary cyclone cylinder (7) and the cooling tertiary cyclone cylinder (8) are all provided with air locking valves (81).
6. The clay-ore suspension calcination system of claim 5, wherein: the primary preheating cyclone (1) and the cooling secondary cyclone (7) are both high-efficiency dust collection double-cyclone cylinders.
7. The clay-ore suspension calcination system of claim 6, wherein: and the system fan (10) and the cooling fan (11) are both connected with a motor (M).
8. The system for suspension calcination of clayey ore according to claim 7, wherein: the feeding granularity of the clay mineral raw material in the conveying pipeline is less than 200um.
9. A process flow for a clayey ore suspension calcination system according to claim 8, comprising the steps of:
the method comprises the following steps: the pulverized and dried clay mineral materials are fed into a flue gas ascending pipeline between a primary preheating cyclone cylinder (1) and a secondary preheating cyclone cylinder (2) through a conveying pipeline;
step two: clay mineral materials fed into the primary preheating cyclone (1) and the secondary preheating cyclone (2) enter the primary preheating cyclone (1) along with the smoke ascending pipeline and smoke, in the process, the materials and the smoke exchange heat, the temperature of high-temperature smoke from the secondary preheating cyclone (2) is reduced, the temperature of the materials is heated and increased, the materials are collected in the primary preheating cyclone (1), and the materials are fed into the secondary preheating cyclone (2) through a discharging pipeline; meanwhile, a smoke ascending pipeline is connected with the secondary preheating cyclone (2) and the tertiary preheating cyclone (3), the materials exchange heat with the smoke again, and the hot materials are collected by the secondary preheating cyclone (2) and fed into a decomposing furnace (4) for calcination;
step three: the lower part of the decomposing furnace (4) is connected with the cooling cyclone cylinder, and cooling air for cooling the burnt material is changed into high-temperature gas for combustion air of the decomposing furnace through heat exchange; an outlet at the top of the decomposing furnace (4) is connected with the three-stage preheating cyclone (3) and is used for collecting calcined materials in the decomposing furnace (4), feeding the calcined materials into a cooling fan (11) through a feeding pipeline and cooling the calcined materials in a cooling first-stage cyclone (6);
step four: high-temperature materials are fed into a cooling primary cyclone (6) to start cooling and collection, the process is just opposite to the whole preheating process, the materials exchange heat with cold air among the cooling primary cyclone (6), a cooling secondary cyclone (7) and a cooling tertiary cyclone (8), the cooling primary cyclone (6) is used for rapidly cooling and calcining clay, the air volume is small, the forming of reducing atmosphere in a decomposing furnace (4) is facilitated, and the color of a finished product is controlled; excessive cooling air is adopted in the cooling secondary cyclone (7) and the cooling tertiary cyclone (8) to cool clay, so that the temperature of a finished product can be ensured, and redundant cooling hot air bypasses a waste gas pipeline and is converged with waste gas of a preheating and calcining system to be used for drying clay mineral materials;
step five: the cooled calcined clay collected by the cooling three-stage cyclone (8) is connected with a conveying reamer (9) through a blanking pipeline and conveyed into a storage by a series of conveying devices.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Application publication date: 20221118 |