CN116086147A - Device and method for preventing titanium concentrate from hardening of low-temperature drying rotary kiln - Google Patents
Device and method for preventing titanium concentrate from hardening of low-temperature drying rotary kiln Download PDFInfo
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- CN116086147A CN116086147A CN202211635833.6A CN202211635833A CN116086147A CN 116086147 A CN116086147 A CN 116086147A CN 202211635833 A CN202211635833 A CN 202211635833A CN 116086147 A CN116086147 A CN 116086147A
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- rotary kiln
- flue gas
- pipe
- air
- titanium concentrate
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- 239000012141 concentrate Substances 0.000 title claims abstract description 62
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000010936 titanium Substances 0.000 title claims abstract description 59
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 59
- 238000001035 drying Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 75
- 239000003546 flue gas Substances 0.000 claims abstract description 75
- 239000007789 gas Substances 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 239000003034 coal gas Substances 0.000 claims description 12
- 239000000779 smoke Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000004429 Calibre Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000001599 direct drying Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N hydrochloric acid Substances Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000007363 ring formation reaction Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The invention provides a device and a method for preventing a titanium concentrate from hardening at a low temperature drying rotary kiln, which relate to the technical field of indirect drying rotary kiln production processes, wherein the device comprises a hot blast stove, an air mixing chamber, a main flue gas pipe and a rotary kiln; the hot blast stove is characterized in that a primary air pipe, a secondary air pipe and a gas pipe are respectively connected to the hot blast stove, the gas pipe is connected with the hot blast stove through a burner, one side of the hot blast stove is connected with a large caliber end of a funnel-shaped air mixing chamber, a steel plate spiral is wrapped outside the air mixing chamber, a spiral channel between the air mixing chamber and the steel plate spiral is a tertiary air preheating channel, the tertiary air pipe is connected with an inlet of the tertiary air preheating channel, an outer steel shell is connected with a main flue gas pipe, a rotary kiln is arranged outside the main flue gas pipe, water-containing titanium concentrate is arranged in the rotary kiln, and a furnace gas pipeline is arranged on the rotary kiln. The invention can solve the problem of adhesion between the muffler and the inner wall of the rotary kiln, improve the production efficiency and reduce the labor intensity.
Description
Technical Field
The invention relates to the technical field of indirect drying rotary kiln production processes, in particular to a device and a method for preventing a titanium concentrate from hardening at a low temperature.
Background
The production of the titanium concentrate is to take tailings of iron-containing composite iron ore after iron separation as raw materials, and the tailings are obtained through enrichment after mineral separation, and the enrichment treatment method of the titanium concentrate is mainly divided into two main types, namely a dry method and a wet method. Dry processes include electric furnace smelting, plasma smelting, selective chlorination and other thermal reduction processes; wet methods include a partial reduction-hydrochloric acid leaching method, a partial reduction-sulfuric acid leaching method, a reduction rust method, a full reduction-hydrochloric acid leaching method, and the like. The titanium concentrate is subjected to a high temperature process, whether it is a dry or wet enrichment process. However, the titanium concentrate after flotation generally contains 8-12% of moisture, and if the aqueous titanium concentrate is directly used in a high-temperature process, the oxidation-reduction roasting effect and energy consumption of the aqueous titanium concentrate are affected, so that the aqueous titanium concentrate is very necessary to be dried and dehydrated before being fed into a furnace.
The drying process of the titanium concentrate comprises two methods of direct drying and indirect drying. Because the titanium concentrate has the characteristics of fine granularity, wide granularity distribution range, more than 75 percent of particles with the granularity of less than 200 meshes (0.074 mm), large water content of materials, easy caking, large specific gravity, true specific gravity of 4.30t/m < 3 >, poor fluidity and the like, the direct drying titanium concentrate has large loss and poor production environment, and the flotation reagent is easy to decompose or volatilize to discharge the pungent odor due to high initial temperature in the drying process, thereby causing environmental pollution and seriously affecting the life of people. In the indirect drying mode, because the titanium concentrate has high specific gravity, slides along the inner wall after entering the drying rotary kiln, has fine granularity and high moisture content, the indirect drying is easy to be hardened on a flue gas return pipe and the inner wall of the drying rotary kiln at a feeding end, the equipment load is increased, and the production efficiency is reduced; because the inner pipelines of the indirect drying rotary kiln are arranged more, the space is narrow, and the manual operation intensity is increased.
In the existing hardening prevention method, CN202853264U discloses a ilmenite concentrate drying system device, diesel oil or gas is combusted to generate high-temperature flue gas to dry ilmenite concentrate, and the high-temperature flue gas decomposes ilmenite concentrate flotation agent to generate toxic substances such as CS2 and the like, so that environmental pollution is caused and human health is endangered. CN103234339B discloses a device for microwave drying of titanium concentrate and application, however, the scheme requires three-stage drying, the process route is long, the thickness of the titanium concentrate cloth is 1cm, the yield is low, and mass production is difficult. The CN202547427U and the CN207317552U use external mobile equipment to clean the ring formation of the rotary kiln, on one hand, the rotary kiln is relatively long, the two modes are difficult to clean middle bonding, on the other hand, the two modes belong to no measures after the ring formation, the bonding problem is difficult to solve from the source, and meanwhile, the production efficiency is influenced when the rotary kiln stops producing; and for the indirect drying rotary kiln with more pipelines such as a flue gas pipe, a return gas pipe and the like arranged in the interior, the space is small, and the cleaning rod of the two devices is difficult to operate.
Disclosure of Invention
According to the technical problems, a device and a method for preventing the hardening of the titanium concentrate low-temperature drying rotary kiln are provided. The invention uses the dust to wrap the titanium concentrate to form tiny titanium concentrate pellets, solves the problem of adhesion of the rotary kiln, and simultaneously effectively utilizes the dust produced by smelting the titanium concentrate by the electric furnace.
The invention adopts the following technical means:
an apparatus for preventing hardening of a titanium concentrate low-temperature drying rotary kiln, comprising: the device comprises a hot blast stove, an air mixing chamber, a main flue gas pipe and a rotary kiln;
the hot blast stove is characterized in that a primary air pipe, a secondary air pipe and a gas pipe are respectively connected to the hot blast stove, the gas pipe is connected with the hot blast stove through a burner, one side of the hot blast stove is connected with a large-caliber end of a funnel-shaped air mixing chamber, a steel plate spiral is wrapped outside the air mixing chamber, a spiral passage between the air mixing chamber and the steel plate spiral is a tertiary air preheating passage, the tertiary air pipe is connected with an inlet of the tertiary air preheating passage, a small-caliber end of the air mixing chamber is provided with an inner steel shell, a small-caliber end of the steel plate spiral is provided with an outer steel shell, the outer steel shell is connected with a main flue gas pipe, a flue gas pipeline is arranged on the main flue gas pipe, a rotary kiln is arranged outside the main flue gas pipe, water-containing titanium concentrate is arranged in the rotary kiln, and a furnace gas pipeline is arranged on the rotary kiln.
Further, the screw pitch range of the steel plate screw is 200-500 mm, and the height range of the steel plate screw is 100-300 mm.
Further, the length of the outer layer steel shell is 200-300 mm longer than that of the inner layer steel shell.
Further, the pressure range of the flue gas pipeline after heat exchange through the main flue gas pipe and the return gas pipe is-150 Pa to-80 Pa, and the temperature range of the flue gas after heat exchange is 100-120 ℃.
Further, the pressure range of the furnace gas pipeline is-120 Pa to-200 Pa, and the temperature range of the furnace gas pipeline is 70 ℃ to 90 ℃.
Further, a wireless thermocouple is arranged at the position of 1/4-1/3 of the feeding end of the rotary kiln, the rotating speed range of the rotary kiln is 2.3-3.1 revolutions/min, and the temperature range measured by the wireless thermocouple is 99+/-1 ℃.
The invention also provides a method for preventing the hardening of the titanium concentrate low-temperature drying rotary kiln, which is realized based on the device for preventing the hardening of the titanium concentrate low-temperature drying rotary kiln, and comprises the following steps:
introducing air into the hot blast stove through a primary air pipe and a secondary air pipe, introducing coal gas into the hot blast stove through a coal gas pipe to enable the coal gas to be combusted once, wherein the primary combustion is incomplete combustion, the flow ratio of the air to the coal gas is in the range of 0.9-1.0, and the temperature range of flue gas in the hot blast stove is 1000-1100 ℃;
the flue gas in the hot blast stove flows into the air mixing chamber, and is introduced into the tertiary air pipe and preheated in the spiral tertiary air preheating channel;
the flue gas in the air mixing chamber is mixed with the air preheated in the tertiary air preheating channel in the outer steel shell, and the mixture is combusted for the second time and then enters the main flue gas pipe;
the flue gas enters a main flue gas pipe and a return gas pipe which are connected, and emits high temperature, and the flue gas exchanges heat with the hydrous titanium concentrate and is discharged from a flue gas pipeline of the main flue gas pipe;
the water-containing titanium concentrate is paved at the bottom of the rotary kiln, the rotary kiln rotates to enable the water-containing titanium concentrate entering from the discharging pipe to exchange heat with smoke in the main smoke pipe, and water vapor generated by the heat exchange of the water-containing titanium concentrate is discharged through a furnace gas pipeline of the rotary kiln, so that dry titanium concentrate is obtained.
Compared with the prior art, the invention has the following advantages:
1. the invention reduces the combustion air quantity of the original primary air pipe and secondary air pipe, and increases the tertiary air pipe, so that the smoke is secondarily combusted, the flame length is prolonged, and the heat exchange efficiency is increased.
2. According to the invention, the flue gas and the hydrous titanium concentrate are subjected to heat exchange by the setting device, so that the titanium concentrate is dried, and the titanium concentrate is not hardened due to the moisture.
3. According to the invention, the steel plate spiral with the spiral channel is arranged, so that the tertiary air preheating channel is prolonged, the heat of air introduced by the tertiary air is higher, and the combustion is more facilitated.
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 the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic view of the structure of the device of the present invention.
In the figure: 1. a primary air duct; 2. a secondary air duct; 3. a gas pipe; 4. a burner; 5. hot blast stove; 6. a tertiary air duct; 7. an air mixing chamber; 8. the steel plate is spiral; 9. a tertiary air preheating channel; 10. a furnace gas duct; 11. a flue gas duct; 12. an inner steel shell; 13. an outer steel shell; 14. a thermocouple; 15. a rotary kiln; 16. a main flue pipe; 17. an air return pipe; 18. and (5) blanking pipes.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
As shown in fig. 1, the present invention provides an apparatus for preventing a titanium concentrate from hardening in a low-temperature drying rotary kiln, comprising: the hot blast stove 5, the air mixing chamber 7, the main flue gas pipe 16 and the rotary kiln 15;
the hot blast stove 5 is respectively connected with a primary air pipe 1, a secondary air pipe 2 and a gas pipe 3, the gas pipe 3 is connected with the hot blast stove 5 through a burner 4, one side of the hot blast stove 5 is connected with a large-caliber end of a funnel-shaped air mixing chamber 7, a steel plate spiral 8 is wrapped outside the air mixing chamber 7, a spiral channel between the air mixing chamber 7 and the steel plate spiral 8 is a tertiary air preheating channel 9, the tertiary air pipe 6 is connected with an inlet of the tertiary air preheating channel 9, a small-caliber end of the air mixing chamber 7 is provided with an inner steel shell 12, a small-caliber end of the steel plate spiral 8 is provided with an outer steel shell 13, the outer steel shell 13 is connected with a main flue gas pipe 16, a flue gas pipeline 11 is arranged on the main flue gas pipe 16, a rotary kiln 15 is arranged outside the main flue gas pipe 16, water-containing titanium concentrate is arranged in the rotary kiln 15, and a furnace gas pipeline 10 is arranged on the rotary kiln 15.
The invention also provides a method for preventing the hardening of the titanium concentrate low-temperature drying rotary kiln, which is realized based on a device for preventing the hardening of the titanium concentrate low-temperature drying rotary kiln and comprises the following steps:
air is introduced into the hot blast stove 5 through the primary air pipe 1 and the secondary air pipe 2, coal gas is introduced into the hot blast stove 5 through the coal gas pipe 3 to enable the coal gas to be combusted once, the primary combustion is incomplete combustion, the flow ratio of the air to the coal gas is in the range of 0.9-1.0, and the temperature range of flue gas in the hot blast stove 5 is 1000-1100 ℃;
the flue gas in the hot blast stove 5 flows into the air mixing chamber 7, and the flue gas is introduced into the tertiary air pipe 6 and preheated in the spiral tertiary air preheating channel 9;
the flue gas in the air mixing chamber 7 is mixed with the air preheated in the tertiary air preheating channel 9 in the outer steel shell 13, and the mixture enters the main flue gas pipe 16 after secondary combustion;
the flue gas enters a main flue gas pipe 16 and a return gas pipe 17 which are connected and emits high temperature, and the flue gas exchanges heat with the hydrous titanium concentrate and is discharged from a flue gas pipeline 11 of the main flue gas pipe 16;
the bottom of the rotary kiln 15 is paved with hydrous titanium concentrate, the rotary kiln 15 rotates to enable the hydrous titanium concentrate entering from the discharging pipe 18 to exchange heat with smoke in the main smoke pipe 16, and water vapor generated by the heat exchange of the hydrous titanium concentrate is discharged through a furnace gas pipeline 10 of the rotary kiln 15, so that dry titanium concentrate is obtained.
The principle of the invention is as follows:
the invention reduces the combustion air flow rate in the primary air pipe 1 and the secondary air pipe 2 of the hot blast stove, controls the flow rate ratio of the air and the gas entering the hot blast stove 5 to be between 0.9 and 1.0, thereby leading the gas entering the hot blast stove 5 through the gas pipe 3 to be in an incomplete combustion state, and controlling the temperature of the flue gas to be between 1000 and 1100 ℃.
The steel shell interlayer of the mixing chamber is welded by adopting a steel plate spiral 8 and is used as a tertiary air preheating channel 9, the spiral distance is 200-500 mm, and the height is 100-300 mm. The length of the outer steel shell 13 of the outlet of the air mixing chamber 7 is 200-300 mm longer than that of the inner steel shell 12.
The pressure of the flue gas pipeline 11 is between-150 Pa and-80 Pa after heat exchange through the main flue gas pipe 16 and the air return pipe 17, and the temperature of the flue gas after heat exchange is between 100 and 120 ℃, so that the incompletely combusted flue gas before heat exchange is subjected to secondary combustion with air preheated by the tertiary air preheating channel 9 through the tertiary air pipe 6 when entering the main flue gas pipe 16 through the air mixing chamber 7, the flame length is prolonged, and the heat exchange efficiency is increased.
After the heat exchange between the aqueous titanium concentrate and the main flue gas pipe 16, water vapor formed in the titanium concentrate enters furnace gas, the water vapor is discharged out of the rotary kiln through a furnace gas pipeline 10, the pressure of the furnace gas pipeline 10 is controlled between-120 Pa and-200 Pa, and the temperature of the furnace gas is controlled between 70 ℃ and 90 ℃.
A wireless thermocouple 14 is arranged at a position 1/4-1/3 away from the feeding end of the rotary kiln, the rotating speed of the rotary kiln is adjusted at 2.3-3.1 revolutions/min, and the temperature of the wireless thermocouple is controlled at 99+/-1 ℃.
Example 1
In a laboratory 500kg/h rotary kiln experiment, fixing gas flow, adjusting combustion-supporting air quantity to control air-coal ratio to 1.0, and controlling flue gas temperature to 1055-1100 ℃, spiral spacing to 200mm and height to 150mm; the pressure of the flue gas pipeline is controlled between-100 Pa and-80 Pa, and the temperature of the outlet flue gas is 100-110 ℃; the outlet pressure of the furnace gas is controlled between minus 130Pa and minus 120Pa, and the temperature of the furnace gas is 85 ℃ to 90 ℃; the average temperature of the wireless thermocouple is 99.9 ℃ at 1/4 distance from the feeding end of the rotary kiln; the rotary kiln rotates at 2.3 rpm, and the air return pipe is smooth after 96 hours of operation.
Example 2
In a 30 ten thousand ton/year drying line test, the gas flow is fixed, the primary air quantity and the secondary air quantity of the hot blast stove are adjusted, the air-coal ratio of the hot blast stove is 0.93, the flue gas temperature is 1020-1035 ℃, the spiral pitch is 400mm, and the height is 200mm; the pressure of a flue gas pipeline is controlled between minus 130Pa and minus 100Pa, and the temperature of flue gas in the flue gas pipeline is 115-120 ℃; the pressure of a furnace gas pipeline is controlled between-200 Pa and-170 Pa, and the temperature of furnace gas is 85 ℃ to 90 ℃; the average temperature of the wireless thermocouple is 99.7 ℃ at 1/4 distance from the feeding end of the rotary kiln; the rotary kiln rotates at 2.7 r/min, the return air pipe is smooth after 4 months of operation, and the gas consumption per ton of ore is reduced by 1.73%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The utility model provides a prevent device of titanium concentrate low temperature drying rotary kiln hardening which characterized in that includes: a hot blast stove (5), an air mixing chamber (7), a main flue gas pipe (16) and a rotary kiln (15);
the utility model discloses a hot-blast furnace, including hot-blast furnace (5), including main flue gas pipe (16), main flue gas pipe (16) and main flue gas pipe (16), be connected with tuber pipe (1), secondary air pipe (2) and gas pipe (3) on hot-blast furnace (5) respectively, gas pipe (3) link to each other with hot-blast furnace (5) through nozzle (4), one side of hot-blast furnace (5) links to each other with the heavy-calibre end of hopper-shaped air mixing chamber (7), the outside parcel of air mixing chamber (7) has steel sheet spiral (8), spiral passageway between air mixing chamber (7) and steel sheet spiral (8) is tertiary air preheating channel (9), tertiary air pipe (6) with the entry of tertiary air preheating channel (9) links to each other, the small-bore end of air mixing chamber (7) is provided with inlayer steel casing (12), the small-bore end of steel sheet spiral (8) is provided with outer steel casing (13), be provided with flue gas pipe (16) on main flue gas pipe (16), main flue gas pipe (16) outside is provided with rotary kiln (15), be provided with moisture titanium concentrate in rotary kiln (15), be provided with on rotary kiln (15).
2. The apparatus for preventing hardening of a titanium concentrate low-temperature drying rotary kiln according to claim 1, wherein: the screw pitch range of the steel plate screw (8) is 200-500 mm, and the height range of the steel plate screw (8) is 100-300 mm.
3. The apparatus for preventing hardening of a titanium concentrate low-temperature drying rotary kiln according to claim 1, wherein: the length of the outer steel shell (13) is 200-300 mm longer than that of the inner steel shell (12).
4. The apparatus for preventing hardening of a titanium concentrate low-temperature drying rotary kiln according to claim 1, wherein: the pressure range of the flue gas pipeline (11) is-150 Pa to-80 Pa after heat exchange through the main flue gas pipe (16) and the air return pipe (17), and the temperature range of the flue gas after heat exchange is 100-120 ℃.
5. The apparatus for preventing hardening of a titanium concentrate low-temperature drying rotary kiln according to claim 1, wherein: the pressure range of the furnace gas pipeline (10) is-120 Pa to-200 Pa, and the furnace gas temperature range of the furnace gas pipeline (10) is 70-90 ℃.
6. The apparatus for preventing hardening of a titanium concentrate low-temperature drying rotary kiln according to claim 1, wherein: a wireless thermocouple (14) is arranged at the position 1/4-1/3 of the feeding end of the rotary kiln (15), the rotating speed range of the rotary kiln (15) is 2.3-3.1 revolutions/min, and the temperature range measured by the wireless thermocouple (14) is 99+/-1 ℃.
7. A method for preventing the hardening of a titanium concentrate low-temperature drying rotary kiln, which is realized based on the device for preventing the hardening of the titanium concentrate low-temperature drying rotary kiln according to the claims 1-6, and comprises the following steps:
air is introduced into the hot blast stove (5) through the primary air pipe (1) and the secondary air pipe (2), coal gas is introduced into the hot blast stove (5) through the coal gas pipe (3) to enable the coal gas to be combusted once, the primary combustion is incomplete combustion, the flow ratio of the air to the coal gas is in the range of 0.9-1.0, and the temperature range of flue gas in the hot blast stove (5) is 1000-1100 ℃;
the flue gas in the hot blast stove (5) flows into the air mixing chamber (7), and the flue gas is introduced into the tertiary air pipe (6) and preheated in the spiral tertiary air preheating channel (9);
the flue gas in the air mixing chamber (7) is mixed with the air preheated in the tertiary air preheating channel (9) in the outer steel shell (13), and the mixture enters the main flue gas pipe (16) after secondary combustion;
the flue gas enters a main flue gas pipe (16) and a return gas pipe (17) which are connected with each other and emits high temperature, and the flue gas exchanges heat with the aqueous titanium concentrate and is discharged from a flue gas pipeline (11) of the main flue gas pipe (16);
the water-containing titanium concentrate is paved at the bottom of the rotary kiln (15), the rotary kiln (15) rotates to enable the water-containing titanium concentrate entering from the discharging pipe (18) to exchange heat with smoke in the main smoke pipe (16), and water vapor generated by the heat exchange of the water-containing titanium concentrate is discharged through a furnace gas pipeline (10) of the rotary kiln (15) to obtain dry titanium concentrate.
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