CN114471354B - Circulating fluidization granulation and drying process and device - Google Patents
Circulating fluidization granulation and drying process and device Download PDFInfo
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- CN114471354B CN114471354B CN202210125745.5A CN202210125745A CN114471354B CN 114471354 B CN114471354 B CN 114471354B CN 202210125745 A CN202210125745 A CN 202210125745A CN 114471354 B CN114471354 B CN 114471354B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/16—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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- 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
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
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Abstract
The invention belongs to the technical field of ceramic tile blanks and ceramic tile production, and particularly relates to a circulating fluidization granulation and drying process and device. The invention provides a circulating fluidized granulation and drying process and a device capable of homogenizing powder.
Description
Technical Field
The invention belongs to the technical field of ceramic tile blanks and ceramic tile production, and particularly relates to a circulating fluidized granulation and drying process and a circulating fluidized granulation and drying device.
Background
The prior art comprises the following steps:
the dry powder process is an advanced process which has wide development and is used for manufacturing dry-pressed ceramic tile powder. In the dry pulverizing process, the fine powder obtained by the grinding system and the impurity removing process is required to be prepared into granules in the granulating process, so that the granules are used by a pressing system, and the granules are pressed into corresponding ceramic tile blanks by a pressing machine to be used for the next process.
The granulation process of the fine powder obtained by dry powder preparation generally uses a suspended excessively wet granulation system, but the present inventors have found that the above-mentioned prior art has at least the following technical problems:
firstly, the produced pellets have a problem of non-uniformity. In the suspended water adding granulation process, fine powder and other granulation materials are easy to adhere to the cone body and the granulation disc of the granulation tower, the granularity of the materials after being adhered to form blocks is far larger than that of normal granules to be obtained, the materials stay in the vibrating fluidized bed for a long time due to the overlarge granularity, the surface moisture is further lower than that of the normal granules, and the moisture content in the materials is higher than that of the normal granules. After entering the vibrating fluidized bed, the outer surfaces of the materials are dried and disintegrated, and the granularity of the materials is similar to that of normal granules and cannot be removed by a subsequent screen. Because of their lower moisture content than normal powders and the resultant differences in plastic properties, this portion of the pellets cannot then be pressed from normal pellets into homogeneous green bodies in a downstream green body pressing process, thereby causing defects in the green bodies and thus affecting the quality of the tiles and the yield of finished tiles ultimately obtained by the production line, etc. Therefore, it is a continuing concern and problem to be solved by those skilled in the art to avoid as much as possible the sticking of fine powder to the mass during the granulation process.
Secondly, the sphericity deviation of the powder is low, the strength is low, the powder is easy to damage and pulverize during subsequent conveying and storage, and further the problems of the follow-up press blanking continuity, the cloth uniformity and the cloth grating sticking are affected.
Difficulty and meaning for solving the technical problems:
therefore, based on the problems, the circulating fluidization granulation and drying process and device capable of homogenizing powder are provided with important practical significance.
Disclosure of Invention
The utility model aims to solve the technical problems of non-uniformity of granules, sphericity deviation of powder, low strength and the like in the prior art and provide a circulating fluidization granulation and drying process and device capable of homogenizing powder.
The technical scheme adopted by the embodiment of the application for solving the technical problems in the prior art is as follows:
the utility model provides a circulating fluidization granulation and drying device, circulating fluidization granulation and drying device includes the prilling tower, the prilling tower includes the air current passageway, sets up the cyclone at the air current passageway top and sets up the granulation fluidization dish in the air current passageway bottom, the cyclone communicates with each other with the granulation fluidization dish bottom, be equipped with the throat in the air current passageway.
The embodiment can carry out air flow circulation fluidization, the gas which is discharged from the air flow channel with three necking cylinders is returned to the bottom of the granulation fluidization disc after being dedusted by the two cyclone dust collectors arranged at the top of the granulation tower, and the gas is blown into the granulation fluidization disc by the fan, so that air circulation fluidization is formed, the exhaust emission of a granulation system can be reduced, the humidity in the circulating gas is effectively improved, the wetting of dry powder in the gas is facilitated, and the granulation effect is further improved.
The following technical schemes can also be adopted in the embodiment of the application:
in the above circulating fluidized granulation and drying apparatus, further, the air flow channel is cylindrical, and the number of the necking is three.
The air flow running upwards from the granulating fluidized disc is accelerated at the necking positions, and accelerated spray dispersion is formed on the dry powder fed at the three necking positions, so that 3-level spray is formed, and the powder is favorably adhered and wetted with the adhesive sprayed by the spray gun above the necking positions.
In the above-mentioned circulating fluidized granulation and drying device, further, the cyclone is connected with a pipe for walking, and the pipe for walking extends to the necking position.
The dry powder which is collected by the two cyclone dust collectors and is partially wetted is respectively fed into three necking positions of the cylindrical airflow channel in three parts to form 3-level feeding, and the proportion of the feeding is regulated by a distributing valve arranged at a walking pipe.
In the above circulating fluidized granulation and drying device, further, an atomizing spray gun is arranged above the necking of the air flow channel and at the top, the atomizing spray gun is arranged on the side wall of the air flow channel, and the included angle between the atomizing spray gun and the horizontal is 10-15 degrees.
The number of the atomizing spray guns is 8 to form 4-level spray, and the atomizing spray guns spray the adhesive so as to realize radial and axial cross operation between the atomized adhesive and the dry powder driven by the air, and realize contact and wetting of the adhesive and the dry powder.
In the above-mentioned circulating fluidization granulation and drying device, further, the surface of the granulation fluidization plate is provided with a strip-shaped air charging hole for fluidization of the powder, and the strip-shaped air charging hole is inflated by a blower at the bottom of the granulation fluidization plate.
The granulating disc is rotated circumferentially, and meanwhile, the stirring is realized by the airflow, so that the rolling extrusion of powder in the disc in the axial direction and the radial direction can be realized, the bidirectional stirring granulation is realized, the rolling extrusion times are greatly increased compared with single radial rolling, the rolling is repeated in the drying process, the appearance of the particles in the granulating disc is more approximate to a circle, and the compactness can be improved to a certain extent.
The strip-shaped hot air inlet hole for fluidization of the powder is formed in the surface of the granulating and drying disc, the strip-shaped hot air inlet hole is inflated by the air blower at the bottom of the disc, and when the granulating disc rotates circumferentially, stirring and drying of the powder in the disc can be realized due to the fact that stirring and drying of hot air are realized, the powder is stirred for multiple times in the drying process, uniform heat exchange is realized, and the moisture of the dried powder is more uniform.
In a word, two-way stirring stoving, powder moisture is more even, and compactness and sphericity are better.
In the above-mentioned circulating fluidization granulation and drying device, further, the bar-shaped air charging hole is an arc curve type air channel, the air inlet is a flaring, then gradually shrinking, carrying out certain compression on the air and then accelerating the discharge at the air outlet, the air outlet is positioned at the tail end of the curve, and the air outlet is attached to the surface of the tray body, so that the discharged air flow obliquely passes through the material layer along the surface of the tray body.
The hot air obliquely passes through the material layer, so that the phenomenon that the hot air enters a dust collection system to be discharged without fully exchanging heat with powder due to the fact that the material layer is partially blown through is avoided, and the heat exchange effect is better; the air sticking disc surface which is bulged from the strip-shaped air charging holes moves to form a layer of air film between the disc surface and the wetted powder, so that the wetted powder and the disc surface can be effectively isolated, and the wetted powder can be effectively prevented from adhering to the disc surface.
In the circulating fluidized granulation and drying device, further, the inner wall of the granulation tower adopts a high molecular weight polyethylene material lining or PE spraying; the inlet of the cyclone separator, the inner walls of the spiral case and the inner cylinder are lined with alumina ceramic composite lining plates, the inner walls of the straight cylinder and the cone are lined with ultra-high molecular weight polyethylene, the granulating fluidization plate is made of light aluminum alloy, and the side wall material contact part of the granulating fluidization plate is a UHMW-PE plate.
High molecular weight polyethylene material, HDPE, bulk weight: 0.955g/m 3 Water absorption rate:<0.1%, coefficient of dynamic friction: 0.2 to 0.29, reduces the adhesion of powder on the inner wall of the prilling tower, greatly reduces the generation of adhesionThe occurrence frequency of large unqualified powder is favorable for improving the quality of the granulated powder.
The light aluminum alloy is adopted for manufacturing, so that the problem that the carbon steel material granulating disc rusts and further pollutes raw materials can be effectively avoided. Ultra high molecular weight polyethylene (UHMW-PE) has anti-sticking and anti-wear effects; the friction coefficient of the wall surface of the UHMW-PE is smaller, the adhesion of the powder on the material on the surface of the disc can be reduced, the occurrence frequency of large unqualified powder generated by adhesion is greatly reduced, and the quality of the granulated powder is improved.
In the above-mentioned circulating fluidized granulation and drying device, further, the granulation fluidization dish is connected with the granulation stoving dish, the granulation stoving dish is located the outside of granulation fluidization dish, the granulation stoving dish includes tertiary granulation stoving dish.
In the above-mentioned circulating fluidized granulation and drying device, further, the side wall of the granulation drying disc is lined with polytetrafluoroethylene sheet material, i.e. polytetrafluoroethylene is adhered to a shell of carbon steel or stainless steel, and the powder material only contacts with the polytetrafluoroethylene sheet material.
Can effectively avoid directly contacting the carbon steel or stainless steel shell and can effectively avoid the problem that iron impurities after the carbon steel or stainless steel is worn pollute the raw materials.
A circulating fluidized granulation and drying process employing the circulating fluidized granulation and drying apparatus of any one of the above.
The one or more technical solutions provided in the embodiments of the present application have at least the following beneficial effects:
1. the dry powder is circularly contacted with the atomized granulating tower for multiple times by adopting gas circulation fluidization, so that the wetting opportunity and effect of the dry powder are increased, the granulating efficiency is improved, and in addition, the waste gas emission of a system is reduced by the cyclic utilization of the wet gas; the 3-level spraying, 3-level feeding and four-level spraying enable the dry powder and the granulating agent in the feeding granulating tower to be more uniformly dispersed, so that local aggregation is avoided, and further, local 'over-wet' or 'over-dry' imagination is avoided, and further, the problem that local dry powder in the granulating tower is too much in moisture, and bonding and recycling are carried out after part of dry powder is not wetted is avoided; the rotary fluidization, bidirectional stirring granulation, air film anti-sticking and HDPE anti-sticking adopted in the granulation fluidization disc are used for preventing the wetted powder particles from adhering to the surface of the granulation disc, and gradually compacting and agglomerating in continuous rotation, so that the property difference between the agglomerated powder and non-agglomerated powder is large, the powder is inhomogeneous, the rolling of the powder in the granulation fluidization disc is enhanced, the powder with higher sphericity and compactness is easier to obtain, and the fluidity and storage resistance of the powder are improved.
2. The drying part adopts a 3-level rotary drying disc structure; compared with the existing granulating equipment, the granulating equipment has the advantages of more compact structure, smaller occupied area, lower dust collection air quantity, and better performance of produced powder.
3. After the granulation and drying are integrated, the total occupied area of the equipment is greatly reduced, the dust collection air quantity of the granulation equipment can be greatly reduced by circulating fluidization, the specification of the dust collection equipment is reduced, the system investment is reduced to a certain extent, the structure of the granulation tower is more compact than that of the existing suspended granulation tower, the occupied area is saved, and the investment is lower.
Drawings
The technical solutions of the embodiments of the present application will be described in further detail below with reference to the accompanying drawings, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting of the scope of the present application. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a plan view of a circulating fluidized granulation drying all-in-one machine provided by an embodiment of the invention;
FIG. 2 is a cross-sectional view taken along the direction A-A of FIG. 1 of the present description;
FIG. 3 is a cross-sectional view taken along the direction B-B of FIG. 1 of the present description;
FIG. 4 is a schematic view of a granulation fluid tray structure provided by an embodiment of the present invention;
FIG. 5 is a cross-sectional view taken along the direction C-C of FIG. 4 of the present description;
fig. 6 is a schematic structural diagram of a granulating and drying disc according to an embodiment of the present invention;
FIG. 7 is a D-D sectional view of FIG. 6 of the present description;
FIG. 8 is a schematic flow diagram of FIG. 2 of the present description;
fig. 9 is a flow schematic of fig. 3 of the present description.
In the figure:
1. a granulating fluidization plate; 2-1, a first-stage granulation drying disc; 2-2, a second-stage granulation drying disc; 2-3, a third-stage granulation drying disc; 3. a dual fluid spray gun; 4. UHMW-PE plate; 5. polytetrafluoroethylene plates; 6. a blower; 7. a prilling tower; 8. an air flow channel; 9. a cyclone separator; 10. walking the tube; 11. and a strip-shaped air filling hole.
Detailed Description
Aiming at the problems existing in the prior art, the embodiment provides a circulating fluidization granulation process and device, which uses water as a binder, utilizes a Roots blower to spray dry powder after impurity removal into a cylindrical airflow channel with three necking openings from the lower part of a granulation tower through a pipeline, airflow flowing from bottom to top is arranged in the channel, a double-fluid spray gun which is annularly arranged is arranged on the side wall of the cylindrical airflow channel, the binder is sprayed into the airflow channel through the spray gun, a part of dry powder flowing through a binder spraying area wets, adheres, agglomerates and forms granules under the action of the binder, and flows down to a granulation fluidization disc reversely, and is thrown out from the granulation fluidization disc to a first-stage granulation drying disc to exchange heat with hot air under the action of rotating granulation fluidization disc rotation centrifugation, so that first-stage drying is completed; then, under the action of rotary centrifugation of the rotary granulating and drying disc, the granules are thrown out from the first-stage granulating and drying disc to the second-stage granulating and drying disc to exchange heat with hot air, so that the second drying is completed; and then, throwing out the granules from the second-stage granulation to the third-stage granulation drying disc under the action of rotary centrifugation of the rotary granulation drying disc, performing heat exchange with hot air, finishing third drying, and then entering the next procedure.
Dry powder which flows through the binder spraying area and is not bonded with the binder into particles continuously rises to a cyclone separator arranged at the top of the cylindrical airflow channel along with airflow, gas-solid separation is realized under the action of the cyclone separator, and the separated dry powder is respectively fed above three necking openings in the cylindrical airflow channel through a material separating valve and a walking pipe to continuously contact with the binder for granulation; the separated gas is pressurized by a fan and then is blown into a granulating and fluidizing disc to fluidize the powder material granulated in the fluidizing disc, and the air force flowing out of the granulating disc enters the cylindrical air flow channel again, so that the dry powder is circularly fluidized and granulated.
The hot air of the granulating and drying disc comes from the waste heat of the kiln or the hot air furnace, is blown into the granulating and drying disc by a fan, and the hot air which completes heat exchange in the granulating and drying disc is sent into a bag type dust collector through a pipeline and is discharged after dust collection.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
The utility model provides a circulating fluidization granulation and drying device, circulating fluidization granulation and drying device includes the prilling tower, the prilling tower includes the air current passageway, sets up the cyclone at the air current passageway top and sets up the granulation fluidization dish in the air current passageway bottom, the cyclone communicates with each other with the granulation fluidization dish bottom, be equipped with the throat in the air current passageway.
The embodiment can carry out air flow circulation fluidization, the gas which is discharged from the air flow channel with three necking cylinders is returned to the bottom of the granulation fluidization disc after being dedusted by the two cyclone dust collectors arranged at the top of the granulation tower, and the gas is blown into the granulation fluidization disc by the fan, so that air circulation fluidization is formed, the exhaust emission of a granulation system can be reduced, the humidity in the circulating gas is effectively improved, the wetting of dry powder in the gas is facilitated, and the granulation effect is further improved.
The airflow channel is cylindrical, and the number of the necking is three.
The air flow running upwards from the granulating fluidized disc is accelerated at the necking positions, and accelerated spray dispersion is formed on the dry powder fed at the three necking positions, so that 3-level spray is formed, and the powder is favorably adhered and wetted with the adhesive sprayed by the spray gun above the necking positions.
The cyclone dust collector is connected with a walking pipe, and the walking pipe extends to the necking position.
The dry powder which is collected by the two cyclone dust collectors and is partially wetted is respectively fed into three necking positions of the cylindrical airflow channel in three parts to form 3-level feeding, and the proportion of the feeding is regulated by a distributing valve arranged at a walking pipe.
And an atomization spray gun is arranged above the necking of the air flow channel and at the top, the atomization spray gun is arranged on the side wall of the air flow channel, and the included angle between the atomization spray gun and the horizontal is 10-15 degrees.
The number of the atomizing spray guns is four to form 4-level spray, and the atomizing spray guns spray the adhesive so as to realize radial and axial cross operation between the atomized adhesive and the dry powder driven by the air, and realize contact and wetting of the adhesive and the dry powder.
The surface of the granulating and fluidizing disc is provided with a strip-shaped air charging hole for fluidizing powder, and the strip-shaped air charging hole is inflated by a blower at the bottom of the granulating and fluidizing disc.
The granulating disc is rotated circumferentially, and meanwhile, the stirring is realized by the airflow, so that the rolling extrusion of powder in the disc in the axial direction and the radial direction can be realized, the bidirectional stirring granulation is realized, the rolling extrusion times are greatly increased compared with single radial rolling, the rolling is repeated in the drying process, the appearance of the particles in the granulating disc is more approximate to a circle, and the compactness can be improved to a certain extent.
The strip-shaped hot air inlet hole for fluidization of the powder is formed in the surface of the granulating and drying disc, the strip-shaped hot air inlet hole is inflated by the air blower at the bottom of the disc, and when the granulating disc rotates circumferentially, stirring and drying of the powder in the disc can be realized due to the fact that stirring and drying of hot air are realized, the powder is stirred for multiple times in the drying process, uniform heat exchange is realized, and the moisture of the dried powder is more uniform.
In a word, two-way stirring stoving, powder moisture is more even, and compactness and sphericity are better.
The strip-shaped air charging holes are arc-shaped curve-shaped air channels, the air inlets are flaring and gradually shrinking, air is compressed to a certain extent and is discharged at the air outlets in an accelerating mode, the air outlets are located at the tail ends of curves, the air outlets are attached to the surface of the tray body, and discharged air flows obliquely penetrate through the material layers along the surface of the tray body.
The hot air obliquely passes through the material layer, so that the phenomenon that the hot air enters a dust collection system to be discharged without fully exchanging heat with powder due to the fact that the material layer is partially blown through is avoided, and the heat exchange effect is better; the air sticking disc surface which is bulged from the strip-shaped air charging holes moves to form a layer of air film between the disc surface and the wetted powder, so that the wetted powder and the disc surface can be effectively isolated, and the wetted powder can be effectively prevented from adhering to the disc surface.
The inner wall of the granulating tower is lined with a high molecular weight polyethylene material or sprayed with PE; the inlet of the cyclone separator, the inner walls of the spiral case and the inner cylinder are lined with alumina ceramic composite lining plates, the inner walls of the straight cylinder and the cone are lined with ultra-high molecular weight polyethylene, the granulating fluidization plate is made of light aluminum alloy, and the side wall material contact part of the granulating fluidization plate is a UHMW-PE plate.
High molecular weight polyethylene material, HDPE, bulk weight: 0.955g/m 3 Water absorption rate:<0.1%, coefficient of dynamic friction: 0.2 to 0.29, reduces the adhesion of powder on the inner wall of the granulation tower, greatly reduces the occurrence frequency of large unqualified powder generated by adhesion, and is beneficial to improving the quality of the granulated powder.
The light aluminum alloy is adopted for manufacturing, so that the problem that the carbon steel material granulating disc rusts and further pollutes raw materials can be effectively avoided. Ultra high molecular weight polyethylene (UHMW-PE) has anti-sticking and anti-wear effects; the friction coefficient of the wall surface of the UHMW-PE is smaller, the adhesion of the powder on the material on the surface of the disc can be reduced, the occurrence frequency of large unqualified powder generated by adhesion is greatly reduced, and the quality of the granulated powder is improved.
The granulation fluidization plate is connected with the granulation drying plate, the granulation drying plate is positioned at the outer side of the granulation fluidization plate, and the granulation drying plate comprises three-stage granulation drying plates.
And the side wall of the granulating and drying disc is lined with polytetrafluoroethylene plates, namely polytetrafluoroethylene is bonded on a shell of carbon steel or stainless steel, and powder only contacts with the polytetrafluoroethylene plates.
Can effectively avoid directly contacting the carbon steel or stainless steel shell and can effectively avoid the problem that iron impurities after the carbon steel or stainless steel is worn pollute the raw materials.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the gas circulation fluidization is adopted in the granulating tower to enable the dry powder to be in repeated circulation contact with the atomized granulating tower, so that the wetting opportunity and effect of the dry powder are increased, the granulating efficiency is improved, and in addition, the recycling of the wet gas also reduces the exhaust emission of the system; the 3-level spraying increases the dispersion of dry powder in the granulating tower, the multi-level feeding avoids the problem that single-point feeding dry powder cannot be uniformly dispersed, the 4-level spraying is distributed at different height positions of the granulating tower, the granulating agent existing in the single-point spraying cannot be uniformly dispersed in the granulating tower, the dry powder and the granulating agent fed into the granulating tower are more uniformly dispersed, the local aggregation existing in a single feeding point and a single spraying is avoided, the local 'over-wet' or 'over-dry' imagination is avoided, the problem that the local dry powder in the granulating tower is excessively wet and the bonding and recycling are carried out after the part of dry powder is not wetted is avoided, the granulating efficiency of the granulating tower is improved, and meanwhile, the 'over-wet' agglomeration problem in the granulating tower is avoided;
the rotary fluidization adopted in the granulating and fluidizing disc enables the gas adopted in the granulating and fluidizing disc to realize bidirectional stirring granulation by rotating the disc body, so that the problem that the granulation is close to ellipse due to the fact that the disc body is only rotated for granulation is avoided; the disc body surface adopts the anti-sticking of air film and the UHMW-PE dish of lateral wall lining to prevent that the disc body from getting rid of the powder to the problem that the disc lateral wall bonds into the piece, and then cause the powder of caking part and the powder property difference of not caking big, cause the inhomogeneous of powder, also strengthened the powder in addition and rolled in the granulation fluidization dish, obtained the powder that sphericity and compactness are higher more easily to improve the mobility and the storage property of powder.
And the granulating and drying disc also adopts gas and disc body rotation to realize bidirectional stirring and drying on powder falling into the granulating and drying disc in the drying stage, so that the problem that the stay time of large-particle powder is overlong in the fluidized bed dryer is avoided, and further, the property difference between the powder at the caking part and the non-caking powder is large, so that the powder is inhomogeneous, and in addition, the rolling of the powder in the granulating and fluidization disc in the drying stage is enhanced, so that the powder with higher sphericity and compactness is easier to obtain, and the fluidity and the storage property of the powder are improved.
In summary, the invention provides a circulating fluidized granulation and drying process and device capable of homogenizing powder.
The foregoing examples illustrate the invention in detail, but are merely preferred embodiments of the invention and are not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (5)
1. A circulating fluidized granulation and drying device, characterized in that: the circulating fluidization granulation and drying device comprises a granulation tower, the granulation tower comprises an airflow channel, a cyclone dust collector arranged at the top of the airflow channel and a granulation fluidization disc arranged at the bottom of the airflow channel, the cyclone dust collector is communicated with the bottom of the granulation fluidization disc, a necking is arranged in the airflow channel, the granulation fluidization disc is connected with a granulation drying disc, strip-shaped air charging holes for fluidization of powder are formed in the surface of the granulation fluidization disc, the strip-shaped air charging holes are inflated by a blower at the bottom of the granulation fluidization disc, the strip-shaped air charging holes are arc-shaped curve-shaped air channels, the air inlet is flared and gradually reduced, the air is compressed to a certain extent and then is discharged at the air outlet, the air outlet is positioned at the tail end of the curve, the air outlet is attached to the surface of the disc, the discharged air flow obliquely penetrates through a material layer along the surface of the disc, the airflow channel is cylindrical, the number of necking is three, the cyclone dust collector is connected with a walking tube, the necking is extended to the position of the necking of the airflow channel, a spray gun is arranged above the air flow channel and at the top position, the top of the air channel, the air charging holes form a four-level spray gun, the spray gun is arranged at an included angle of 10 DEG with the horizontal spray gun, and the spray gun is arranged at the side wall of the horizontal spray gun.
2. The circulating fluidized granulation and drying apparatus of claim 1, wherein: the inner wall of the granulating tower is lined with a high molecular weight polyethylene material or sprayed with PE; the inlet of the cyclone dust collector, the inner walls of the spiral case and the inner cylinder are lined with alumina ceramic composite lining plates, the inner walls of the straight cylinder and the cone are lined with ultra-high molecular weight polyethylene, the granulating fluidization plate is made of light aluminum alloy, and the side wall material contact part of the granulating fluidization plate is a UHMW-PE plate.
3. The circulating fluidized granulation and drying apparatus of claim 1, wherein: the granulation stoving dish is located the outside of granulation fluidization dish, the granulation stoving dish includes tertiary granulation stoving dish.
4. The circulating fluidized granulation and drying apparatus of claim 1, wherein: and the side wall of the granulating and drying disc is lined with polytetrafluoroethylene plates, namely polytetrafluoroethylene is bonded on a shell of carbon steel or stainless steel, and powder only contacts with the polytetrafluoroethylene plates.
5. A circulating fluidized granulation and drying process is characterized in that: the circulating fluidized granulation and drying process employs the circulating fluidized granulation and drying apparatus of any one of claims 1 to 4.
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| CN113828244A (en) * | 2021-10-21 | 2021-12-24 | 山东天力能源股份有限公司 | Magnesium chloride granulation and drying integrated system and method |
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| AU566889B2 (en) * | 1982-09-24 | 1987-11-05 | Freund Industrial Co. Ltd. | A granulating and coating machine |
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| JP2996809B2 (en) * | 1992-09-10 | 2000-01-11 | ホソカワミクロン株式会社 | Granulator using fluidized bed |
| JP3143309B2 (en) * | 1993-06-04 | 2001-03-07 | ホソカワミクロン株式会社 | Powder processing equipment |
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| CN113368779B (en) * | 2021-05-28 | 2023-04-14 | 天津水泥工业设计研究院有限公司 | Granulator for dry-pressing ceramic tile dry-method powder-making process |
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| CN103920418A (en) * | 2014-04-16 | 2014-07-16 | 陈林书 | Adjustable fluidized bed coating process and adjustable fluidized bed coating device |
| CN113828244A (en) * | 2021-10-21 | 2021-12-24 | 山东天力能源股份有限公司 | Magnesium chloride granulation and drying integrated system and method |
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| CN114471354A (en) | 2022-05-13 |
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