CN111792855B - Straight barrel type light-burned magnesia suspension roasting device - Google Patents
Straight barrel type light-burned magnesia suspension roasting device Download PDFInfo
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- CN111792855B CN111792855B CN202010841286.1A CN202010841286A CN111792855B CN 111792855 B CN111792855 B CN 111792855B CN 202010841286 A CN202010841286 A CN 202010841286A CN 111792855 B CN111792855 B CN 111792855B
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- preheating
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000000725 suspension Substances 0.000 title claims abstract description 53
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 105
- 239000007789 gas Substances 0.000 claims abstract description 64
- 238000004321 preservation Methods 0.000 claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003546 flue gas Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 19
- 230000000149 penetrating effect Effects 0.000 claims 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 abstract description 18
- 239000001095 magnesium carbonate Substances 0.000 abstract description 18
- 235000014380 magnesium carbonate Nutrition 0.000 abstract description 18
- 229910000021 magnesium carbonate Inorganic materials 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005245 sintering Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 19
- 239000000047 product Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 15
- 239000000843 powder Substances 0.000 description 11
- 239000004744 fabric Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000000354 decomposition reaction Methods 0.000 description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
-
- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Furnace Details (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a straight barrel type light-burned magnesia suspension roasting device, wherein the upper part of a kiln body of the device is a straight barrel type suspension roasting section, and the lower part of the kiln body is a heat preservation section; the top of the suspension roasting section is provided with an inlet device, the side wall of the upper part of the suspension roasting section is provided with a high-temperature flue gas inlet, a gas material outlet pipe is arranged between the suspension roasting section and the heat preservation section, and the gas material outlet pipe is connected with a gas material separation device. The invention overcomes the limitation of the existing suspension roasting magnesite production light-burned magnesia equipment on high gas flow rate, can carry out suspension roasting at lower gas flow rate, shortens the gas material stroke, and has simple structure, convenient operation and flexible control; and part of materials are subjected to suspension roasting and then are subjected to heat preservation in a furnace body, so that the sintering is uniform, the product activity is high, the quality is stable, the heat loss of the device is small, and the efficiency is high.
Description
Technical Field
The invention relates to the technical field of light-burned magnesia roasting kilns, in particular to a straight-barrel light-burned magnesia suspension roasting device.
Background
The method has the advantages that the method has rich magnesite resources in China, the resource amount is proved to be 36.42 hundred million t, and the method accounts for 28.85 percent of the total world, and has the characteristic of centralized resource distribution. Although China is a large country of magnesite resources, high-grade ores are gradually deficient due to years of blind exploitation and rough production modes, the quality of products is unstable, the production efficiency is low, and the added value of the products is low. The light burned magnesia is one of main products of roasting magnesite, is also a raw material of many subsequent products such as dead burned magnesia and magnesia cementing material, and has great practical significance for comprehensive utilization of magnesite resources. The improvement of the light burned magnesia production equipment is an effective way for breaking through the technical bottleneck of the development of the light burned magnesia in China.
The production mode of light burned magnesia in China is original, the traditional reflective kiln is used for production all the time, the production material is small, the energy consumption is large, the pollution is serious, and the degree of automation is low; in addition, the kiln raw material is a blocky material, the specific surface area is small, the decomposition reaction speed is low, the product can be subjected to external overburning to lose activity, the raw material decomposition is incomplete due to internal underfiring, the product activity is low, and the quality is poor. In recent years, a suspension roasting furnace starts to become production equipment for light-burned magnesia, a suspension roasting method takes powdery raw ore or floating ore as a raw material, roasting is completed in a pneumatic conveying process of taking high-temperature flue gas as a gas phase working medium, a roasting product is obtained through a gas-material separation device, and the raw ore or floating ore enters a storage bin after heat preservation for a period of time, so that the production process is completed. Because of the adoption of powdery raw materials, the particle size is small, the specific surface area is large, the roasting time is short, the roasting is more uniform, and the product quality is stable.
The roasting of magnesite to produce magnesium oxide has chemical reaction process, and the chemical reaction products are magnesium oxide and carbon dioxide. Light burned magnesia is used as a product, and the purity and the activity of the product are both corresponding indexes, and the activity of the magnesia is reduced due to over-burning or under-burning. At present, the equipment for producing magnesium oxide by suspension roasting magnesite generally requires higher gas flow rate during production so as to meet the requirement of pneumatic conveying. Considering that magnesite powder may have a mutual adhesion in the roasting process, which leads to a larger particle size, the gas flow rate is generally between 15 and 20m/s in order to ensure normal production, so that the roasting furnace also needs a sufficient stroke to meet the requirement of roasting time, which is generally above 30 m. The structure of the current suspended roasting furnace hearth is complex, the adjusting capability is poor, the over-burning and under-burning conditions are easy to cause, and the product quality is influenced.
The Chinese patent document with publication number CN205133417U discloses a kiln for continuously roasting light burned magnesia of magnesite pellets, which is vertically arranged, wherein the interior of the kiln is provided with a feeding heating zone, a combustion zone, a cooling zone and a discharging zone from top to bottom, the feeding heating zone consists of an expansion section, a middle section and a contraction section, the cooling zone is provided with an air supply device, the discharging zone is provided with a discharging device, the continuous roasting light burned powder of magnesite pellets can be realized, the structure is simple, the construction cost is low, and the service life is long; but the pellet has larger particle size relative to powder, long roasting time and long production period, and the surface overburning condition can occur, and on the other hand, the blocking condition caused by material sintering can occur.
The Chinese patent document with publication number CN206069711U discloses a suspension roasting device for a light-burned magnesia roasting furnace, which takes magnesite powder as a raw material, gas enters the device from the lower part of the device, suspension and hot gas rise simultaneously, and are discharged from the upper part of the device after roasting is completed, so that the device has the advantages of rapid reaction, uniform sintering, high product activity and good quality, and realizes large-scale, continuous and rapid production of the light-burned magnesia; however, in the device, a gas material ascending mode is adopted, and in consideration of the condition that the particle size is increased due to agglomeration in the roasting process of light-burned magnesium oxide, a higher gas flow rate and enough roasting time are required for ensuring normal production, so that the gas material stroke is longer, and problems exist in practical construction.
The Chinese patent document with publication No. CN106186742A discloses a light-burned magnesia gradually-expanding suspension roasting device, which considers the condition that carbon dioxide is generated by decomposing magnesium carbonate to increase the gas quantity, divides a kiln body into a lower gradually-expanding reaction section and an upper stable crystallization section, fully decomposes magnesite powder in the gradually-expanding reaction section, and completes crystallization in the stable crystallization section, wherein the section of the gradually-expanding reaction section to be mentioned gradually expands along with the increase of the gas, the flow field is uniform, the gas material rises uniformly, the sintering is uniform, and the product activity is high and the quality is good; however, the device still adopts the design of gas material ascending, is limited by high gas flow rate, and the gas material stroke is long, adopts the design of fuel in the kiln simultaneously, and the kiln body cross section of corresponding region is narrower, more easily causes the overburning.
In addition, in the existing process of producing magnesium oxide by suspension roasting magnesite, light burned magnesium oxide needs to be discharged out of a kiln for gas-material separation, and during the process, heat loss is large through a plurality of devices, so that poor heat preservation effect can be caused or longer heat preservation time is required, and the product quality and the production efficiency are affected.
Disclosure of Invention
The invention aims to: the invention provides a straight barrel type light-burned magnesia suspension roasting device, which aims to overcome the limitation of the existing device for preparing light-burned magnesia by suspension roasting magnesite on high gas flow rate, shorten the gas material stroke and reduce the heat loss.
The technical scheme is as follows:
a suspension roasting device of straight tube type light burned magnesia is characterized in that the upper part of a kiln body of the device is a suspension roasting section in a straight tube type shape, and the lower part is a heat preservation section; the top of the suspension roasting section is provided with an inlet device, the side wall of the upper part of the suspension roasting section is provided with a high-temperature flue gas inlet, a gas material outlet pipe is arranged between the suspension roasting section and the heat preservation section, and the gas material outlet pipe is connected with a gas material separation device.
The high-temperature flue gas inlet is arranged along the tangential direction of the circumferential direction of the kiln body.
The upper part of the heat preservation section is a straight cylinder, and the lower part of the heat preservation section is a funnel shape with gradually smaller sectional area.
The inlet device comprises a preheating material inlet pipe, a preheating air inlet pipe, a distribution cone vibrating device and a mixing area, wherein the preheating material inlet pipe is arranged inside the preheating air inlet pipe, the distribution cone is further arranged in the preheating material inlet pipe, one end of the distribution cone, which penetrates out of the preheating material inlet pipe, is connected with the distribution cone vibrating device, the distribution cone vibrating device is fixed on the top of the kiln body or the inlet device, the mixing area at the bottom of the inlet device is a tubular structure with a wide inner cavity and a narrow outlet.
The inlet of the preheating material inlet pipe is positioned above the preheating air inlet pipe, and the included angle alpha between the axis of the preheating material inlet pipe and the vertical direction is 40-50 degrees; the axis of the middle part of the preheating material inlet pipe coincides with the vertical direction, and the outlet of the preheating material inlet pipe is positioned above the mixing area.
The part of the distribution cone extending out from the lower part of the preheating material inlet pipe is gradually increased from top to bottom, and is in a horn-shaped structure, and one side of the horn-shaped part facing the material is a smooth curved surface.
The kiln body height is 12-17m.
The invention has the advantages that the limitation of the existing equipment for producing light burned magnesia by suspending and roasting magnesite on high gas flow rate is overcome, suspension roasting can be carried out under lower gas flow rate, the gas material stroke is shortened, the structure of the device is simple, the operation is convenient, and the control is flexible; and part of materials are subjected to suspension roasting and then are subjected to heat preservation in a furnace body, so that the sintering is uniform, the product activity is high, the quality is stable, the heat loss of the device is small, and the efficiency is high.
Drawings
FIG. 1 is a schematic diagram of a straight cylinder type suspension roasting light burned magnesia apparatus;
FIG. 2 is a schematic cross-sectional view of a high temperature flue gas inlet;
FIG. 3 is a schematic illustration of the inlet device configuration;
the reference numerals are: the device comprises a kiln body 1, a suspension roasting section 11, a heat preservation section 12, a 2-inlet device, a 21-preheating material inlet pipe, a 22-preheating air inlet pipe, a 3-high-temperature flue gas inlet, a 4-gas outlet pipe, a 5-gas separation device, a 51-hot gas outlet pipe, a 52-hot material outlet pipe, a 6-material outlet pipe, a 61-valve, a 7-material distribution cone, an 8-material distribution cone vibrating device and a 9-mixing area.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The upper part of the kiln body is a suspension roasting section, the lower part of the kiln body is a heat preservation section, a gas outlet pipe is arranged between the suspension roasting section and the heat preservation section, the gas outlet pipe is communicated with a gas separation device, and the gas stroke is short; the heat preservation area is arranged in the hearth, materials can be preserved in the hearth, and heat loss is small; the high-temperature flue gas carries the rotational flow of materials, so that the reaction is sufficient, and the product collection rate is high; the inlet device blows off and uniformly mixes the materials, and then the materials enter the kiln body, so that the reaction is sufficient, and the product collection rate is high; the device overcomes the limitation of high gas flow rate in the production of the existing suspension roasting furnace, shortens the gas material stroke and simplifies the furnace structure while guaranteeing the roasting time; the final product has the characteristics of good quality and high activity.
As shown in figure 1, a straight barrel type light burned magnesia suspension roasting device is characterized in that the upper part of a kiln body 1 is provided with a straight barrel type suspension roasting section 11, and the lower part is provided with a heat preservation section 12; the top of the suspension roasting section 11 is provided with an inlet device 2, the side wall of the upper part of the suspension roasting section 11 is provided with a high-temperature flue gas inlet 3, high-temperature flue gas enters the suspension roasting section 11 from the high-temperature flue gas inlet 3 to supply heat for the roasting process, a gas material outlet pipe 4 is arranged between the suspension roasting section 11 and the heat preservation section 12, and a gas material downward movement mode is adopted, so that the limitation of high gas flow rate in the gas material upward process is avoided, and the complexity of equipment is avoided; the gas material outlet pipe 4 is connected with a gas material separation device 5 for further separating gas materials, a hot gas outlet pipe 51 is arranged at the upper part of the gas material separation device 5, a hot material outlet pipe 52 is arranged at the bottom of the gas material separation device 5, and the hot material outlet pipe 52 is connected with a valve; the bottom of the heat preservation section 12 is provided with a material outlet pipe 6, and the material outlet pipe 6 is connected with a valve 61.
As shown in fig. 2, the high-temperature flue gas inlet 3 is arranged along the tangential direction of the circumferential direction of the kiln body 1. The gas entering the kiln body 1 through the high-temperature flue gas inlet 3 enters the suspension roasting section 11 along the tangential direction of the circumferential direction of the kiln body 1 to form a rotational flow carrying materials, so that the materials complete decomposition reaction in the rotational flow movement process, the decomposition reaction speed is improved, and the reaction is more sufficient; thereby effectively avoiding the situation that the product is subjected to external overburning to lose activity and the raw materials are decomposed incompletely due to internal underfiring.
The upper part of the heat preservation section 12 is a straight cylinder, and the lower part of the heat preservation section 12 is a funnel shape with gradually smaller sectional area. As the materials in the suspension roasting section 11 complete the decomposition reaction in the rotational flow movement process, the lower part of the heat preservation section 12 is funnel-shaped, which is more beneficial to the sedimentation of the materials, so that the settled materials are preserved.
As shown in fig. 3, the inlet device 2 comprises a preheating material inlet pipe 21, a preheating air inlet pipe 22, a distribution cone 7, a distribution cone vibrating device 8 and a mixing zone 9, the inlet device 2 is respectively communicated with the preheating material inlet pipe 21 and the preheating air inlet pipe 22, namely, the inlet device 2 is a common inlet of the preheating material and the preheating air overgrate, the preheating material inlet pipe 21 is arranged in the preheating air inlet pipe 22, the inlet is positioned above the preheating air inlet pipe 22, the included angle alpha between the axis of the inlet and the vertical direction is 40-50 degrees, the reason for the arrangement is that the powder has better fluidity after drying, the continuous movement of the powder can be ensured by the inclined angle of 40-50 degrees, the inclined inlet pipe is designed to provide a space for the fixed installation of the distribution cone, the axis of the middle part is coincident with the vertical direction, the outlet is positioned above the mixing zone 9, the distribution cone 7 is further arranged in the preheating material inlet pipe 21, one end with a curved surface of the distribution cone 7 downwards extends out of the preheating material inlet pipe 21, the other end upwards penetrates through the pipe wall of the inclined section of the preheating material inlet pipe 21 and is connected with the distribution cone device 8, the distribution cone 8 is fixed on the top of the distribution cone 8 or the distribution cone device 1 or the distribution cone 7 is fixed on the top of the mixing zone 2, and the distribution cone is in a narrow-shaped channel is formed on the bottom of the mixing zone 9, and the mixing zone is the bottom of the mixing zone 9, and the mixing zone is the inlet channel is the inlet-shaped with the inlet channel 9 is the inlet channel of the material inlet 9. The convergent channel makes the secondary air revolve in the mixing area 9 of the inlet device 2, the secondary air blows away and mixes the materials evenly, and then the materials enter the suspension roasting section 11 for roasting, thereby being beneficial to the materials to be fully contacted with combustion air in the suspension roasting section 11 for full roasting.
The part of the material distribution cone 7, which extends downwards to form the preheating material inlet pipe 21, is gradually increased from top to bottom, the overall appearance is similar to a horn-shaped structure, and one side of the horn-shaped structure facing the material is a smooth curved surface. When the material moves to the position right above the inlet device 2, the material falls under the action of gravity, and after passing through the curved surface of the distribution cone, the movement direction is changed from vertical downward into annular downward movement, so that the dispersity of the material is improved, and the mixing of the gas material in the mixing zone 9 is promoted.
The cloth cone vibrating device 8 can adopt a CZ series vibrator of Jiangsu vibration strong mechanical science and technology Co., ltd, and can periodically vibrate the cloth cone, one end of the cloth cone vibrating device 8 is connected with a motor, and the other end is connected with the upper end of the cloth cone 7. The cloth cone vibrating device 8 is used for fixing the cloth cone on one hand, on the other hand, the cloth cone vibrating device 8 is used for providing power for the motor, the hammer head is driven by the transmission device to periodically vibrate the cloth cone 7, the period can be shortened according to the increase of the feeding amount, powder adhered to the surface of the cloth cone 7 falls off to the mixing area 9 through vibration, and the phenomenon that the powder is deposited on the cloth cone 7 and blocks the preheating material inlet pipe 21 is avoided.
The preheated material and the secondary air are mixed in a mixing zone 9 and enter the kiln body 1 through a tapered channel.
At present, the flue gas and the material inlet of the suspension roasting furnace are arranged at the bottom of the furnace body, the material moves upwards along with the flue gas, a higher gas flow rate is generally required to meet the requirement of pneumatic conveying, the gas flow rate is generally set between 15 and 20m/s in consideration of the condition that the mutual bonding particle size of magnesite powder is increased in the roasting process, and the roasting process requires more than 2s, so that the travel of the gas in the roasting furnace is longer, and is generally more than 30m, and the overall height of the device is higher; the device is characterized in that the gas inlet is arranged above the furnace body, the gas moves downwards, the gas flow speed is reduced and can be reduced to below 5m/s, the gas stroke is obviously shortened, and the height of the kiln body 1 is controlled to be 12-17m.
The preheated magnesite powder enters the inlet device 2 through a preheated material inlet pipe 21, the secondary air enters the inlet device 2 through a preheated air inlet pipe 22 and is mixed, and the mixed material is brought into the suspension roasting section 11 by the secondary air; the high-temperature flue gas with preset temperature and flow rate enters the suspension roasting section 11 from the high-temperature flue gas inlet 3 to supply heat for the roasting process, so that a rotational flow carrying materials is formed; the materials, the secondary air and the high-temperature flue gas are mixed and then move downwards along the kiln body 1 in a cyclone mode, and decomposition reaction is completed in the moving process; after the roasting process is finished, partial gas materials are separated in the kiln body 1, the materials enter the heat preservation section 12, and the high-temperature gas is wrapped with a small amount of materials and enters the gas-material separation device 5 through the gas-material outlet pipe 4; the high-temperature gas after gas-material separation enters a subsequent flow path from a hot gas outlet pipe 51, and the separated material is discharged from a hot material outlet pipe 52, is subjected to heat preservation outside the furnace and then enters the subsequent flow path; the material entering the heat preservation section 12 enters a subsequent flow path from the material outlet pipe 6 after being preserved for 0.5-2 hours according to the process requirements, and the discharging speed can be controlled by a valve 61.
The device is used for actually producing light burned magnesia: the technological conditions are that the grain size of the raw materials is less than 200 meshes, the temperature of the flue gas is 1000-1300 ℃, the flow rate of the gas is 3-5 m/s, the whole height of the device is 15m, and the annual output can reach 50000 t/year.
Claims (4)
1. A straight barrel type light burned magnesia suspension roasting device is characterized in that: the upper part of the kiln body (1) is a straight cylinder type suspension roasting section (11), and the lower part is a heat preservation section (12); an inlet device (2) is arranged at the top of the suspension roasting section (11), a high-temperature flue gas inlet (3) is arranged on the side wall of the upper part of the suspension roasting section (11), a gas outlet pipe (4) is arranged between the suspension roasting section (11) and the heat preservation section (12), and the gas outlet pipe (4) is communicated with a gas separation device (5);
the inlet device (2) comprises a preheating material inlet pipe (21), a preheating air inlet pipe (22), a distribution cone (7), a distribution cone vibrating device (8) and a mixing area (9), wherein the preheating material inlet pipe (21) is arranged inside the preheating air inlet pipe (22), the distribution cone (7) is further arranged in the preheating material inlet pipe (21), one end of the distribution cone (7) penetrating out of the preheating material inlet pipe (21) is connected with the distribution cone vibrating device (8), the distribution cone vibrating device (8) is fixed on the top of the kiln body (1) or the inlet device (2), and the mixing area (9) at the bottom of the inlet device (2) is of a tubular structure with a wide inner cavity and a narrow outlet;
the inlet of the preheating material inlet pipe (21) is positioned above the preheating air inlet pipe (22), and the included angle alpha between the axis of the preheating material inlet pipe (21) and the vertical direction is 40-50 degrees; the axis of the middle part of the preheating material inlet pipe (21) coincides with the vertical direction, and the outlet of the preheating material inlet pipe (21) is positioned above the mixing zone (9);
the part of the distribution cone (7) extending out from the lower part of the preheating material inlet pipe (21) is gradually increased from top to bottom in diameter and is in a horn-shaped structure, and one side of the horn-shaped part facing the material is a smooth curved surface.
2. The straight tube type light burned magnesia suspension roasting device according to claim 1, which is characterized in that: the high-temperature flue gas inlet (3) is arranged along the tangential direction of the circumferential direction of the kiln body (1).
3. The straight tube type light burned magnesia suspension roasting device according to claim 1, which is characterized in that: the upper part of the heat preservation section (12) is a straight cylinder, and the lower part of the heat preservation section (12) is a funnel shape with gradually smaller sectional area.
4. The straight tube type light burned magnesia suspension roasting device according to claim 1, which is characterized in that: the height of the kiln body (1) is 12-17m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010841286.1A CN111792855B (en) | 2020-08-20 | 2020-08-20 | Straight barrel type light-burned magnesia suspension roasting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010841286.1A CN111792855B (en) | 2020-08-20 | 2020-08-20 | Straight barrel type light-burned magnesia suspension roasting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111792855A CN111792855A (en) | 2020-10-20 |
| CN111792855B true CN111792855B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010841286.1A Active CN111792855B (en) | 2020-08-20 | 2020-08-20 | Straight barrel type light-burned magnesia suspension roasting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01278438A (en) * | 1988-04-30 | 1989-11-08 | Ube Chem Ind Co Ltd | Magnesia-calcia clinker |
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| JP2000256058A (en) * | 1999-03-09 | 2000-09-19 | Yotai Refractories Co Ltd | Firebrick |
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