CN110260656B - Zone control multistage turbulent fluidization reaction furnace - Google Patents
Zone control multistage turbulent fluidization reaction furnace Download PDFInfo
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- CN110260656B CN110260656B CN201910525639.4A CN201910525639A CN110260656B CN 110260656 B CN110260656 B CN 110260656B CN 201910525639 A CN201910525639 A CN 201910525639A CN 110260656 B CN110260656 B CN 110260656B
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- 238000005243 fluidization Methods 0.000 title claims abstract description 46
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- 238000009826 distribution Methods 0.000 claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 36
- 238000002485 combustion reaction Methods 0.000 claims abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003546 flue gas Substances 0.000 claims abstract description 25
- 239000012495 reaction gas Substances 0.000 claims abstract description 19
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- 239000000779 smoke Substances 0.000 claims description 21
- 238000009423 ventilation Methods 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 8
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Classifications
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- 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
- 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
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
-
- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- 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
-
- 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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
-
- 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
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
-
- 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
- F27D2017/009—Cyclone for separating fines from gas
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
The invention discloses a zone control multistage turbulent fluidization reaction furnace, which comprises a furnace body and a main combustion furnace, wherein the furnace body comprises a reaction zone and at least one preheating zone, the preheating zone is arranged at the upper part of the reaction zone, gas distribution plates are arranged in the reaction zone and the preheating zone, the preheating zone and the reaction zone are separated into mutually independent cavities through a partition plate, and the preheating zone is communicated with the reaction zone through a reaction zone sealing valve; the hot flue gas exhausted by the main combustion furnace is connected with the bottom cavity of the gas distribution plate of the preheating zone through a first hot flue gas pipeline, and the bottom cavity of the gas distribution plate of the reaction zone is connected with a reaction gas inlet pipe. The zoned control multistage turbulent fluidization reaction furnace has the advantages that the material preheating zone and the reaction zone are completed in the same device, the structure is simple, the equipment configuration is compact, the occupied area is small, and the capital investment is saved.
Description
Technical Field
The invention belongs to the technical field of metallurgical and mineral separation equipment, and particularly relates to a fluidization reaction furnace.
Background
According to the relative movement of the material in the reaction furnace and the furnace wall, the gas-solid reaction can be divided into two reaction forms of stacking reaction and fluidization reaction. Compared with the stacking reaction mode, the fluidization reaction process has fast gas-solid heat transfer, mass transfer and chemical reaction speed and high heat transfer and mass transfer efficiency, so that compared with the stacking reaction process, the time required by fluidization reaction is greatly shortened, the comprehensive energy consumption of reaction is greatly reduced, and the quality of reaction products is greatly improved.
With the gradual increase of the operation gas velocity, the gas-solid fluidization is subjected to the transition of bubbling fluidization, turbulent fluidization and rapid fluidization in sequence. Rapid fluidization has the following advantages: 1. high gas velocity, high solids throughput and high solids concentration operation can improve the efficiency and capacity of the reactor; 2. the low gas axial back mixing is beneficial to improving the uniformity of chemical reaction; 3. the rapid mixing of the solids and the uniform temperature distribution of the whole bed layer can realize the optimal operation of chemical reaction. Based on these advantages of rapid fluidization, researchers at home and abroad have proposed various rapid fluidization reaction apparatuses of different structures in recent decades. However, the rapid fluidization reaction furnace has the defects of incapability of rapidly separating materials with complete reaction and unreacted materials, huge structure of circulating equipment, short residence time of the materials in the roasting furnace and the like.
Turbulent fluidization is a fluidization state between bubbling fluidization and fast fluidization, which has smaller bubble size and correspondingly lower pressure pulsation amplitude than bubbling fluidization; compared with rapid fluidization, the method has the advantages that the flow rate of the gas required by turbulent fluidization is low, the difficulty of gas-solid separation after the reaction is finished is low, and the abrasion of equipment is low.
Therefore, by combining the advantages of turbulent fluidization, a brand new turbulent fluidization reaction furnace is developed, and the method has important practical significance on the improvement of fluidized roasting equipment and technology.
Disclosure of Invention
The invention aims to overcome the defects and the shortcomings in the background art, and provides the zoned control multistage turbulent fluidization reaction furnace which has the advantages of low capital investment, good energy-saving and environment-friendly effects, independent control of preheating and reaction zoned atmosphere, reasonable regulation and control of the residence time of coarse and fine particle fractions in the reaction furnace according to granularity, relatively controllable reaction process and the like. In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the multi-stage turbulent fluidization reaction furnace comprises a furnace body and a main combustion furnace, wherein the furnace body comprises a reaction zone and at least one preheating zone, the preheating zone is arranged at the upper part of the reaction zone, gas distribution plates (which can permeate gas and can support materials) with holes and inclined arrangement are arranged in the reaction zone and the preheating zone, the preheating zone and the reaction zone are separated into mutually independent cavities through a partition plate, and the preheating zone and the reaction zone are communicated through a reaction zone sealing valve; the hot flue gas exhausted by the main combustion furnace is connected with the bottom cavity of the gas distribution plate of the preheating zone through a first hot flue gas pipeline, and the bottom cavity of the gas distribution plate of the reaction zone is connected with a reaction gas inlet pipe. The main combustion furnace provides hot flue gas for the preheating zone for preheating materials, and is connected with a fuel pipeline and a fuel gas pipeline. The partition plate can be made of refractory materials or high-temperature-resistant steel plates, and the existence of the partition plate can ensure that the flue gas generated in the reaction zone does not enter the preheating zone, but all the flue gas enters the flue gas purifier through the smoke exhaust pipe.
In the above-mentioned zone-controlled multistage turbulent fluidization reaction furnace, preferably, the reaction zone sealing valve includes a first material inlet and a first material outlet, a material outlet end of a gas distribution plate at the bottommost part of the preheating zone is disposed at the first material inlet, and a material inlet end of a gas distribution plate of the reaction zone is disposed at the first material outlet. More preferably, the first material inlet and the first material outlet are flush with the inner wall of the furnace body. The above arrangement can ensure that the materials on the gas distribution plate directly roll into the reaction zone sealing valve and roll onto the gas distribution plate of the reaction zone from the first material outlet, so that the materials roll more smoothly. Meanwhile, the arrangement mode is favorable for processing the sealing valve of the reaction zone, and can reduce the formation of accumulation dead angles of materials in the furnace body.
In the above-mentioned zone control multistage turbulent fluidization reaction furnace, preferably, the bottom of the reaction zone sealing valve is provided with a first air inlet and a first ventilation plate, the first air inlet is located at the lower part of the first ventilation plate, the first air inlet is communicated with the reaction gas inlet pipe, and the position of the first ventilation plate is lower than the first material outlet. After the reaction gas enters the reaction zone sealing valve from the first air inlet, local fluidization (the reaction between the material and the reaction gas) is formed on the first ventilation plate of the reaction zone sealing valve, so that the material can smoothly flow into the reaction zone, and the blockage of the sealing valve is avoided. Meanwhile, the top of the reaction zone sealing valve isolates the reaction zone from the preheating zone due to static pressure of the material layer, so that short circuit of flue gas in each zone in the reaction furnace is avoided. In addition, through the inlet air flow of the first air inlet, the influence of material fluctuation on the reaction process can be reduced, and the whole reaction process cannot be influenced due to the material fluctuation.
In the above-mentioned zone-controlled multistage turbulent fluidization reaction furnace, preferably, the preheating zone is provided with a plurality of preheating zones, the plurality of preheating zones are mutually independent, and two adjacent preheating zones are communicated through a preheating zone sealing valve.
In the above-mentioned zone-controlled multistage turbulent fluidization reaction furnace, preferably, the preheating zone sealing valve includes a second material inlet and a second material outlet, and the positions of the second material inlet and the second material outlet are flush with the inner wall of the furnace body.
In the above-mentioned zone-controlled multistage turbulent fluidization reaction furnace, preferably, the reaction furnace further comprises a secondary combustion furnace, the bottom of the preheating zone sealing valve is provided with a second air inlet and a second ventilation plate, the second air inlet is positioned at the lower part of the second ventilation plate, and the position of the second ventilation plate is lower than that of the second material outlet; and the hot smoke exhausted by the auxiliary combustion furnace is communicated with a second air inlet through a second hot smoke pipeline. The secondary combustion furnace is connected with a fuel pipeline and a fuel gas pipeline.
The structure of the preheating zone sealing valve is similar to that of the reaction zone sealing valve, the connection mode of the gas distribution plate and the preheating zone sealing valve is the same, but the second gas inlet of the preheating zone sealing valve is connected with hot flue gas discharged by the auxiliary combustion furnace. The auxiliary combustion furnace is used for supplementing sufficient heat for the reaction furnace on one hand and providing clean hot smoke for the sealing valves of the preheating areas on the other hand, so that the blocking of the sealing valves and the short circuit of the smoke in each area are avoided. The second hot smoke pipeline can be selectively connected into the preheating zone according to actual needs to supplement heat.
In the above-mentioned zone-controlled multistage turbulent fluidization reaction furnace, preferably, the aperture ratio of the gas distribution plate is 3% -20%, the aperture is 0.5mm-3mm, and the included angle between the gas distribution plate and the horizontal plane is 20 ° -60 °. The preferable aperture ratio, aperture and inclination angle of the gas distribution plate can ensure that the fine particle materials are basically fluidized and have relatively high movement height and relatively short residence time in the downward movement process of the materials under the action of turbulent fluidization air flow; the coarse grain materials roll downwards against the surface of the distribution plate under the action of the resultant force of gravity and the supporting force of the gas distribution plate, and the residence time is relatively long; the operation air speed is reduced while the whole material layer is in a high turbulence state, the scientific assumption that the retention time of fine-grain materials is relatively short and the retention time of coarse-grain materials is relatively long is realized, the requirements of reaction kinetics of materials with different granularity on the time required by the reaction are met, and the quality of the obtained product is good.
In the above-mentioned zone-control multistage turbulent fluidization reaction furnace, preferably, the upper cavity of the gas distribution plate of the reaction zone is equipped with a smoke exhaust pipe, the smoke exhaust pipe is connected with the inlet of a smoke purifier, and the outlet of the smoke purifier is connected with the main combustion furnace; the top of the reaction furnace is provided with a tail gas outlet which is communicated with a tail gas dust remover. The flue gas purifier can be composed of one or more cyclone separators, and the existence of the flue gas purifier can ensure that the flue gas generated in a reaction zone in the main combustion furnace is cleaner and can not cause the ring formation of the main combustion furnace. The flue gas generated in the reaction zone is sent into a main combustion furnace for combustion, and the pollution of harmful gases such as CO, NO and the like generated by incomplete combustion of the reaction gas to the environment can be eliminated while a heat source is provided for the reaction furnace. The tail gas can be directly discharged after passing through the tail gas dust remover, and the tail gas dust remover can be a cyclone dust remover.
In the above-mentioned zone control multistage turbulent fluidization reaction furnace, preferably, the bottom of the reaction furnace is provided with a material cooler, the material outlet of the reaction zone is connected with the material inlet of the material cooler, a cooling water inlet and a stirring and pushing device are arranged in the material cooler, and the cooling water inlet is connected with a water tank. The stirring pushing device pushes the completely reacted material to the outlet of the material cooler, and the material is cooled by the rapidly sprayed cooling water and then enters into the subsequent treatment to complete the mineral phase conversion process.
In the invention, the reaction zone sealing valve and the preheating zone sealing valve are single flap valve, double flap valve, V-shaped valve or L-shaped valve. The gas distribution plate is provided with a hood or is directly perforated. The top of the furnace body is directly connected with a raw material bin through a feeding device. The inner wall of the furnace body is provided with a lining poured by high-temperature refractory materials.
Compared with the prior art, the invention has the advantages that:
1. the zoned control multistage turbulent fluidization reaction furnace has the advantages that the material preheating zone and the reaction zone are completed in the same device, the structure is simple, the equipment configuration is compact, the occupied area is small, and the capital investment is saved.
2. The zoned control multistage turbulent fluidization reaction furnace has the advantages that the material preheating zone and the reaction zone are mutually independent cavities, and the temperature and atmosphere in the reaction zone and the preheating zone are mutually independent, so that the reaction furnace can flexibly control the thermal reaction environment, the reaction process is relatively controllable, the production index is stable, the production energy consumption is low, and the tail gas of the reaction furnace is ensured to be free of harmful gases such as CO, NO and the like which pollute the environment, thereby being more environment-friendly.
3. The residence time of the coarse and fine fraction materials in the reaction furnace can be reasonably regulated and controlled according to the granularity, the requirements of reaction kinetics of the materials with different granularity on the time required by the reaction are met, and the quality of the obtained products is good.
4. The invention adopts the cold reaction gas to cool the roasting product, and finishes the preheating of the reaction gas while cooling the roasting product, so that a large amount of sensible heat carried by the roasting product is fully recovered, and the comprehensive energy consumption of the roasting operation is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a zone-controlled multistage turbulent fluidized reaction furnace of the present invention.
FIG. 2 is a schematic diagram of the motion trajectories of the gas streams and materials during operation of the zone-controlled multistage turbulent fluidized reaction furnace of the present invention.
Legend description:
1. a furnace body; 101. a reaction zone; 102. a preheating zone; 2. a main combustion furnace; 3. a gas distribution plate; 4. a reaction zone sealing valve; 401. a first air inlet; 402. a first ventilation plate; 403. a first material inlet; 404. a first material outlet; 5. a first hot smoke duct; 6. a reaction gas inlet pipe; 7. a partition plate; 8. a smoke exhaust pipe; 9. a flue gas purifier; 10. a preheating zone sealing valve; 1001. a second air inlet; 1002. a second ventilation plate; 1003. a second material inlet; 1004. a second material outlet; 11. an auxiliary combustion furnace; 12. a second hot smoke duct; 13. a material cooler; 14. a cooling water inlet; 15. a stirring and pushing device; 16. a tail gas outlet; 17. a tail gas dust remover; 18. a fuel pipe; 19. a fuel gas pipe; 20. a water tank; 21. raw material bin.
Detailed Description
The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown, for the purpose of illustrating the invention, but the scope of the invention is not limited to the specific embodiments shown.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
Examples:
as shown in fig. 1 and 2, the zone-controlled multistage turbulent fluidized reaction furnace of the present embodiment comprises a furnace body 1 and a main combustion furnace 2. The furnace body 1 comprises a reaction zone 101 and at least one preheating zone 102 (4 preheating zones 102 are shown in fig. 1 and 2, namely an I zone, an II zone, an III zone and an IV zone respectively, the four preheating zones 102 are mutually independent), the preheating zone 102 is arranged at the upper part of the reaction zone 101, gas distribution plates 3 with holes and obliquely arranged are arranged in the reaction zone 101 and the preheating zone 102, the preheating zone 102 and the reaction zone 101 are separated into mutually independent cavities through a partition plate 7, a material outlet of the preheating zone 102 is communicated with a material inlet of the reaction zone 101 through a reaction zone sealing valve 4 (L-shaped valve), and a material outlet and a material inlet of two adjacent preheating zones 102 are communicated through a preheating zone sealing valve 10 (L-shaped valve). The hot flue gas exhausted by the main combustion furnace 2 is connected with the bottom cavity of the gas distribution plate 3 of the preheating zone 102 through a first hot flue pipe 5, and the bottom cavity of the gas distribution plate 3 of the reaction zone 101 is connected with a reaction gas inlet pipe 6. The main combustion furnace 2 is connected with a fuel pipeline 18 and a combustion-supporting gas pipeline 19. The top of the furnace body 1 is directly connected with a raw material bin 21 through a feeding device.
In this embodiment, the reaction zone sealing valve 4 includes a first material inlet 403 and a first material outlet 404, and the material outlet end of the gas distribution plate 3 at the bottom of the preheating zone 102 is disposed at the first material inlet 403, and the material inlet end of the gas distribution plate 3 of the reaction zone 101 is disposed at the first material outlet 404.
In this embodiment, a first air inlet 401 and a first ventilation plate 402 are disposed at the bottom of the reaction zone sealing valve 4, the first air inlet 401 is located at the lower part of the first ventilation plate 402, the first air inlet 401 is communicated with the reaction gas inlet pipe 6, and the position of the first ventilation plate 402 is lower than the first material outlet 404.
In this embodiment, the first material inlet 403 and the first material outlet 404 are flush with the inner wall of the furnace body 1.
In this embodiment, the preheating zone sealing valve 10 includes a second material inlet 1003 and a second material outlet 1004, and the positions of the second material inlet 1003 and the second material outlet 1004 are flush with the inner wall of the furnace body 1. The connection between the gas distribution plate 3 and the second material inlet 1003 and the second material outlet 1004 in the preheating zone is the same as that of the reaction zone sealing valve 4 described above, and specific reference is made to fig. 1.
In this embodiment, the reaction furnace further includes a secondary combustion furnace 11, the bottom of the preheating zone sealing valve 10 is provided with a second air inlet 1001 and a second air permeable plate 1002, the second air inlet 1001 is located at the lower part of the second air permeable plate 1002, and the position of the second air permeable plate 1002 is lower than the second material outlet 1004; the hot flue gas discharged from the secondary combustion furnace 11 is communicated with the second air inlet 1001 through the second hot flue pipe 12. The secondary combustion furnace 11 is connected with a fuel pipe 18 and a combustion-supporting gas pipe 19.
In this embodiment, the gas distribution plate 3 is formed by processing a high temperature resistant steel plate, the aperture ratio of the gas distribution plate 3 is 3% -20% (all ranges can be mentioned above), the aperture is 0.5mm-3mm (all ranges can be mentioned above), and the included angle between the gas distribution plate 3 and the horizontal plane is 20 ° -60 ° (all ranges can be mentioned above).
In the embodiment, a smoke exhaust pipe 8 is arranged in the upper cavity of the gas distribution plate 3 of the reaction zone 101, the smoke exhaust pipe 8 is connected with the inlet of a smoke purifier 9, and the outlet of the smoke purifier 9 is connected with the main combustion furnace 2; the top of the reaction furnace is provided with a tail gas outlet 16, and the tail gas outlet 16 is communicated with a tail gas dust remover 17 (such as a cyclone dust remover). In this embodiment, the flue gas cleaner 9 is composed of 2 cyclone separators.
In this embodiment, a material cooler 13 is disposed at the bottom of the reaction furnace, a material outlet of the reaction zone 101 is connected to a material inlet of the material cooler 13, a cooling water inlet 14 and a stirring and pushing device 15 are disposed in the material cooler 13, and the cooling water inlet 14 is connected to a water tank 20.
In this embodiment, the feed inlet of the reaction furnace body 1 is connected with the discharge outlet of the raw material bin 21 through a metering device and a pipeline.
Application example 1:
the test of fluidized magnetizing roasting of siderite by using the zone-controlled multistage turbulent fluidized reaction furnace in the above embodiment, the particle size composition of the raw materials used in the test and the analysis results of the main chemical components of the ore sample are shown in table 1 and table 2, respectively.
Table 1: the result of screening the particle size of the sintered ore/%
Table 2: chemical multielement analysis of the fired ore/%
| Component (A) | TFe | FeO | Fe 2 O 3 | SiO 2 | TiO 2 | Al 2 O 3 | CaO | MgO |
| Content of | 34.12 | 38.41 | 6.09 | 15.01 | 0.17 | 2.11 | 1.10 | 3.72 |
| Component (A) | MnO | Na 2 O | K 2 O | P | S | Loss of burning | TFe/FeO | Coefficient of alkalinity |
| Content of | 1.92 | 0.21 | 0.72 | 0.02 | 0.03 | 29.24 | 0.89 | 0.28 |
The ore used in the embodiment has simpler mineral types, the iron ore is mainly siderite and a small amount of limonite, and the gangue minerals are mainly quartz and muscovite; the siderite is produced in a compact aggregate, a small amount of impurity minerals such as fine quartz, muscovite and the like are often distributed among grains, and part of siderite is mineralized with brown iron in different degrees due to the influence of oxidization.
The preheating zone of the reaction furnace used in this example is 3 layers, the aperture ratio of the gas distribution plate 3 is 8%, the aperture is 1mm, and the included angle between the gas distribution plate 3 and the horizontal plane is 30 °. The reaction gas is CO and N 2 According to the following steps: 95, and controlling the temperature of the reaction zone to 650 ℃ by adjusting the flow rate of the reaction gasThe temperature at the flue gas outlet at the top of the reaction furnace is 180 ℃. The relevant limitation of the gas distribution plate 3 and the limitation of the flow rate of the reaction gas can ensure that the residence time of the coarse and fine particle grade materials in the reaction furnace is reasonably regulated and controlled according to the granularity, and meets the requirements of the reaction kinetics of the materials with different granularity on the time required by the reaction.
In the embodiment, after the magnetized roasting ore is subjected to stage grinding-stage weak magnetic separation, the sorting indexes of 47.64% of iron concentrate yield, 64.21% of grade TFe and 89.70% of iron recovery rate can be finally obtained.
Application example 2:
a test of limonite fluidization magnetization roasting was performed by using the zone-controlled multistage turbulent fluidization reaction furnace described in the above examples, and the analysis results of the main chemical components of the raw materials used in the test are shown in Table 3.
Table 3: chemical multielement analysis of the fired ore/%
The chemical components of the burnt ore used in the embodiment are simpler, iron is a main useful element for mineral separation and recovery, and the content of harmful element phosphorus is lower, but the content of sulfur is slightly higher. To achieve the aim of enriching iron minerals, the gangue components which are required to be removed or reduced by ore dressing are mainly SiO 2 Next, al 2 O 3 。
The preheating zone of the reaction furnace used in this example is 3 layers, the aperture ratio of the gas distribution plate 3 is 8%, the aperture is 1mm, and the included angle between the gas distribution plate 3 and the horizontal plane is 30 °. The reaction gas is CO and N 2 According to the following steps of 1:4, controlling the temperature of the reaction zone to 700 ℃ and the temperature of a flue gas outlet at the top of the reaction furnace to 200 ℃ by adjusting the flow rate of the reaction gas, and finally obtaining the iron concentrate after the roasting ore subjected to magnetizing roasting is subjected to stage grinding-stage weak magnetic separationA sorting index of 49.42% of ore yield, 65.23% of grade TFe and 91.15% of iron recovery rate.
Application example 3:
a test for extracting titanium and reducing chromium by fluidized magnetization roasting of ilmenite by using the zonal control multistage turbulent fluidization reaction furnace in the embodiment is shown in Table 4.
Table 4: chemical multielement analysis of the fired ore/%
| Component (A) | TiO 2 | TFe | FeO | Fe 2 O 3 | V 2 O 5 | Cr 2 O 3 | ZrO 2 | Co | SiO 2 | Al 2 O 3 |
| Content of | 38.91 | 35.88 | 25.52 | 22.93 | 0.18 | 3.89 | 0.18 | 0.0083 | 3.82 | 2.31 |
| Component (A) | CaO | MgO | MnO | Na 2 O | K 2 O | P | S | C | Ig | |
| Content of | 0.062 | 0.48 | 1.05 | 0.023 | 0.040 | 0.022 | 0.0080 | 0.057 | 0.42 |
The preheating zone of the reaction furnace used in this example is 4 layers, the aperture ratio of the gas distribution plate 3 is 10%, the aperture is 1mm, and the included angle between the gas distribution plate 3 and the horizontal plane is 35 °. The reaction gas is O 2 Mixing with air according to the proportion of 1:9, controlling the temperature of the reaction zone to 800 ℃ and the temperature of the flue gas outlet at the top of the reaction furnace to 220 ℃ by adjusting the flow rate of the reaction gas, and finally obtaining 73.29% of titanium concentrate yield and grade TiO after dry magnetic separation of the roasted ore after magnetized roasting 2 47.23％、TiO 2 Recovery rate is 87.67%, cr 2 O 3 The removal rate is a sorting index of 95.56%.
Claims (4)
1. The multi-stage turbulent fluidization reaction furnace is characterized by comprising a furnace body (1) and a main combustion furnace (2), wherein the furnace body (1) comprises a reaction zone (101) and at least one preheating zone (102), the preheating zone (102) is arranged at the upper part of the reaction zone (101), gas distribution plates (3) with holes and inclined arrangement are arranged in the reaction zone (101) and the preheating zone (102), the preheating zone (102) and the reaction zone (101) are separated into mutually independent cavities through a partition plate (7), and the preheating zone (102) and the reaction zone (101) are communicated through a reaction zone sealing valve (4); the hot flue gas exhausted by the main combustion furnace (2) is connected with the bottom cavity of the gas distribution plate (3) of the preheating zone (102) through a first hot flue gas pipeline (5), and the bottom cavity of the gas distribution plate (3) of the reaction zone (101) is connected with a reaction gas inlet pipe (6);
the reaction zone sealing valve (4) comprises a first material inlet (403) and a first material outlet (404), the material outlet end of the gas distribution plate (3) at the bottommost part of the preheating zone (102) is arranged at the first material inlet (403), and the material inlet end of the gas distribution plate (3) of the reaction zone (101) is arranged at the first material outlet (404);
the bottom of the reaction zone sealing valve (4) is provided with a first air inlet (401) and a first ventilation plate (402), the first air inlet (401) is positioned at the lower part of the first ventilation plate (402), the first air inlet (401) is communicated with the reaction gas inlet pipe (6), and the position of the first ventilation plate (402) is lower than that of the first material outlet (404);
the positions of the first material inlet (403) and the first material outlet (404) are flush with the inner wall of the furnace body (1);
the preheating areas (102) are provided with a plurality of mutually independent, and two adjacent preheating areas (102) are communicated through a preheating area sealing valve (10);
the preheating zone sealing valve (10) comprises a second material inlet (1003) and a second material outlet (1004), and the positions of the second material inlet (1003) and the second material outlet (1004) are flush with the inner wall of the furnace body (1);
the aperture ratio of the gas distribution plate (3) is 3-20%, the aperture is 0.5-3 mm, and the included angle between the gas distribution plate (3) and the horizontal plane is 20-60 degrees.
2. The zone control multistage turbulent fluidization reaction furnace according to claim 1, further comprising a secondary combustion furnace (11), wherein a second air inlet (1001) and a second air permeable plate (1002) are arranged at the bottom of the preheating zone sealing valve (10), the second air inlet (1001) is positioned at the lower part of the second air permeable plate (1002), and the position of the second air permeable plate (1002) is lower than that of the second material outlet (1004); and hot flue gas exhausted by the secondary combustion furnace (11) is communicated with a second air inlet (1001) through a second hot flue gas pipeline (12).
3. The zone control multistage turbulent fluidization reaction furnace according to claim 1 or 2, characterized in that the upper cavity of the gas distribution plate (3) of the reaction zone (101) is provided with a smoke exhaust pipe (8), the smoke exhaust pipe (8) is connected with the inlet of a smoke purifier (9), and the outlet of the smoke purifier (9) is connected with the main combustion furnace (2); the top of the reaction furnace is provided with a tail gas outlet (16), and the tail gas outlet (16) is communicated with a tail gas dust remover (17).
4. The zone control multistage turbulent fluidization reaction furnace according to claim 1 or 2, wherein the bottom of the reaction furnace is provided with a material cooler (13), the material outlet of the reaction zone (101) is connected with the material inlet of the material cooler (13), and a cooling water inlet (14) and a stirring pushing device (15) are arranged in the material cooler (13).
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