WO2022007457A1

WO2022007457A1 - Multi-stage fluidization tower

Info

Publication number: WO2022007457A1
Application number: PCT/CN2021/087329
Authority: WO
Inventors: 徐静; 黄文攀; 卢超; 张桢琦; 常寨成; 袁媛
Original assignee: 迈安德集团有限公司
Priority date: 2020-07-06
Filing date: 2021-04-15
Publication date: 2022-01-13
Also published as: CN111637687A

Abstract

A multi-stage fluidization tower, comprising a pre-drying tower (A) and a horizontal multi-stage fluidized bed (B). A main shaft (6) is arranged along the axis of the pre-drying tower (A). A first pre-drying layer (1), a first interlayer air chamber (2), a second pre-drying layer (3) and a second interlayer air chamber (4) are sequentially arranged in an inner cavity of a cylindrical body of the pre-drying tower from top to bottom, wherein circular sieve plates (5) are respectively arranged at the tops of the first and second interlayer air chambers (2, 4), material-rake-type stirring fins (6a) are respectively arranged above the circular sieve plates (5), the side walls of the first and second interlayer air chambers (2, 4) are respectively provided with pre-drying air inlets (2a, 4a), and the centers of the tops of the first and second pre-drying layers (1, 3) are respectively provided with pre-drying layer air outlets (1a, 3a); the side wall of the first pre-drying layer (1) is connected to a feeding chute (1b) and a first pre-drying overflow port (1d), an outlet of the feeding chute (1b) is provided with a scattering device (1c), and the first pre-drying overflow port (1d) is connected to a feeding port in the cylinder wall of the second pre-drying layer (3) by means of a pre-drying chute (1e); and the cylinder wall of the second pre-drying layer (3) is also provided with a second pre-drying overflow port (3b) which is in butt joint with a feeding port of the horizontal multi-stage fluidized bed (B). The fluidization tower does not require materials to be returned, and can adopt a first-in first-out approach for materials, and the discharging quality is high.

Description

A multi-stage fluidization tower

technical field

The invention relates to a dryer, in particular to a multi-stage fluidization tower, which can be used for dewatering and drying of fermented feed, and belongs to the technical field of feed processing equipment.

Background technique

With the rapid development of the feed industry, agriculture, animal husbandry or animal husbandry have higher and higher quality requirements for animal feed. The fermented feed contains about 40% water after fermentation, and the product has high humidity and high viscosity. Since a large amount of active substances such as biological enzymes will be produced after the feed is fermented, if the temperature of the material is too high during the drying process, the fermented feed will easily lose its activity. Therefore, the fermented feed is a heat-sensitive material.

In the prior art, the drying of fermented feed often adopts fluidized bed dryer, active drying tower, tubular dryer, combined dryer, etc. The existing drying equipment usually has the following deficiencies:

1. Since the fresh fermented feed, such as fermented soybean meal, is relatively moist and sticky, the existing vertical dryer needs to mix part of the dry material into the fermented soybean meal before entering the dryer for drying, otherwise the fermented soybean meal will be stirred in the dryer. It is easy to agglomerate and stick materials in the process of drying, which causes the mixed finished dry material to repeatedly enter the dryer for drying. Due to repeated high-temperature baking, the color and quality of soybean meal are seriously affected, and its original nutrients are destroyed, causing users to be very uncomfortable. big loss.

2. The existing vertical dryer uses a rotary valve to discharge the material, and it is difficult to ensure that the material is first in, first out, so the drying time of the material is long or short, resulting in uneven moisture content and quality.

3. The ventilation holes of the existing vertical dryer or horizontal dryer are straight holes, the material is boiled upward, and the dry material and the wet material are continuously mixed, which also causes part of the dry material to be repeatedly heated, and it is difficult to ensure the material First in, first out, so the drying time of the material is also long or short, and the quality is not uniform. In addition, due to the small particle size of the material, it is easy to leak into the interlayer through the ventilation holes during the stirring process, and it is difficult to clean up.

4. Most of the horizontal fluidized beds with pre-stirring use horizontal agitation, which results in a large area of agitation, an increase in the number of drives, and an increase in failure points. The use of a single horizontal fluidized bed or a fluidized bed with horizontal agitation can no longer meet the demand for drying quality and yield of fermented feed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the problems existing in the prior art, and provide a multi-stage fluidization tower, which does not need to return materials, avoids repeated drying, and ensures that materials have the same drying time and high and uniform discharge quality. .

In order to solve the above technical problems, a multi-stage fluidization tower of the present invention includes a pre-drying tower, a main shaft is provided along the axis of the pre-drying tower, and the inner cavity of the pre-drying tower cylinder is sequentially provided with a first pre-drying tower from top to bottom. The drying layer, the first interlayer air chamber, the second pre-drying layer and the second interlayer air chamber, the tops of the first interlayer air chamber and the second interlayer air chamber are respectively provided with circular sieve plates, the first and second pre-drying layers A rake-type stirring fin is respectively provided above the circular sieve plate, and the material-rake-type stirring fin is fixed on the main shaft; the side wall of the first interlayer air chamber is provided with a first pre-drying air inlet, and the The top center of a pre-drying layer is provided with a first pre-drying layer air outlet; the side wall of the second interlayer air chamber is provided with a second pre-drying air inlet, and the upper cylinder wall of the second pre-drying layer is provided with a second pre-drying air inlet. Two air outlets of the pre-drying layer; the side wall of the first pre-drying layer is connected with a feeding chute and a first pre-drying overflow port, the outlet of the feeding chute is provided with a dispersing device, and the first pre-drying The overflow port is connected with the feed port on the cylinder wall of the second pre-drying layer through the pre-drying chute; the cylinder wall of the second pre-drying layer is also provided with a second pre-drying overflow port, the second pre-drying overflow The port is connected to the feed port of the horizontal multi-stage fluidized bed.

Compared with the prior art, the present invention achieves the following beneficial effects: the fresh and moist fermented feed falls along the feeding chute, and is first broken up by the breaking device, and the agglomeration of the material is broken and then falls into the circle of the first pre-drying layer. Shaped sieve plate, and then rotated and spread by the rake stirring fins, which is beneficial to evenly spread the wet material on the sieve plate for pre-drying. The main shaft drives the rake-type stirring fin to rotate, and the material-rake-type stirring fin spreads the material on the first layer of circular sieve plate. The air holes on the sieve plate are blown upward, and the material is in direct contact with the material for sufficient heat exchange, and the material is pre-dried in the first stage. air outlet. Due to the large proportion of wet materials and the small proportion of dry materials, under the action of stirring and wind, the lighter dry materials slowly float on the upper layer. When the height of the material layer exceeds the height of the overflow port, it flows out from the first pre-drying overflow port. , enter the second pre-drying layer through the pre-drying chute and land on the circular sieve plate of the second pre-drying layer. The wind enters the second interlayer air chamber from the second pre-drying air inlet, and is blown upward from the air holes on the circular sieve plate for secondary pre-drying. The materials after the secondary pre-drying are discharged from the second pre-drying overflow and enter the horizontal multi-stage fluidized bed for further drying and cooling. Set the number of pre-drying layers according to the actual situation of the material. For materials with high moisture content, you can set up multiple pre-drying layers to ensure that the first dried material overflows into the next layer for re-drying, and there is no need to add dry materials to the raw materials. . And the wet material that has just entered falls on the material that has been initially dried, reducing the chance of sticking to the circular sieve plate. The multi-stage fluidized tower adopts the combination of multi-layer pre-drying tower and horizontal multi-stage fluidized bed, which can effectively solve the problem of difficult drying of viscous materials. After pre-drying, the horizontal multi-stage fluidized bed is used for further drying and cooling after pre-drying, which is beneficial for the material to flow to the discharge end step by step under the impetus of airflow and avoid sticking. When pre-drying in the pre-drying tower, there is no need to mix the finished dry material with the fresh wet material, no need to return the dry material, and at the same time, there is no need to increase the transfer conveying equipment, which reduces the material pollution and energy consumption; also avoids the dry material. During pre-drying, the dry material overflows first, realizing the first-in, first-out of the material, ensuring that the drying time of the material is the same, and the quality of the material is high and uniform. The pre-drying tower adopts at least two layers of structure and shares a set of stirring device, which runs through each layer from bottom to top to form multi-level pre-drying with different gradients. The pre-drying is sufficient and reduces the floor space and maintenance failure points. Each pre-drying layer is respectively equipped with a temperature gauge, a temperature sensor and a pressure gauge, so that each pre-drying layer can adopt different drying temperatures. The temperature sensor can remotely transmit the actual temperature of the material to the control room, and can realize automatic control after interlocking with the inlet air temperature. At the same time, the operator in the control room can intuitively understand the actual temperature on site and can also adjust manually; the temperature gauge and pressure gauge can be It is convenient for field operators to understand the actual temperature and wind pressure on site, and it is convenient for production situation and index control.

As an improvement of the present invention, the circular sieve plates of the first pre-drying layer and the second pre-drying layer are respectively uniformly distributed with laterally open sieve plate fish scale holes, and the direction of the fish scale holes of each sieve plate is the same as that of the material rake. The rotation direction of the stirring fins is the same. Once the wet and sticky fine materials fall into the sieve holes, it is easy to block the sieve holes, and it is difficult to clean up, affecting the air outlet and causing material leakage. The pre-drying layer adopts fish scale hole sieve plate instead of the traditional straight hole sieve plate. The rake type stirring fin drives the material to pass from the top of the fish scale hole of each sieve plate, and the preheated air is blown out along the direction of the material, which can effectively prevent the material from leaking in. The interlayer air chamber of the pre-drying layer; the leakage prevention effect is especially obvious for powdery materials with small particle size.

As a further improvement of the present invention, the bottom walls of the first interlayer air chamber and the second interlayer air chamber are respectively provided with interlayer discharge ports, and below each interlayer discharge port are respectively provided with discharge air shutoff devices; Above the bottom walls of the first interlayer air chamber and the second interlayer air chamber are respectively provided with cleaning and scraping fins, and the cleaning and scraping fins are respectively fixed on the main shafts. A small amount of material leaking into the first interlayer air chamber and the second interlayer air chamber is scraped into the interlayer discharge port by the cleaning scraping fin, and then discharged into the next layer or discharged through the discharge air shutoff device, so that each interlayer air chamber has a self-contained capacity. Cleaning function.

As a further improvement of the present invention, the first pre-drying air inlet and the second pre-drying air inlet are respectively provided with air inlet louvers, and each louver of the air inlet louver is inclined toward the forward direction of the cleaning and scraping fins. When the cleaning and scraping fins rotate, the material is easy to splash upward under the action of centrifugal force. Once it enters the pre-drying air duct, it is difficult to remove. Long-term operation will easily lead to the reduction of the ventilation section. When parking for a long time, the accumulated material is prone to mildew. , causing pollution to the system; setting air inlet shutters can prevent materials from entering the pre-drying air inlet duct.

As a further improvement of the present invention, the first pre-drying overflow port and the second pre-drying overflow port are respectively equipped with adjustable insert plates, and both sides of the adjustable insert plates are respectively embedded in the corresponding vertical slots The upper ends of the adjustable plug-in boards are respectively welded with plug-in lugs, the plug-in lugs are fixed on the lower end of the adjustment screw, the upper part of the adjustment screw passes through the light hole of the screw seat, and the screw The seat is welded on the inner wall of the pre-drying tower cylinder, the adjusting screw is screwed with an adjusting nut and a locking nut, the adjusting nut is pressed on the upper end face of the screw seat, and the locking nut is pressed on the The lower end face of the screw base. Loosen the locking nut and turn the adjusting nut to the right, then the adjusting screw will rise, and the lower end of the adjusting screw will drive the adjustable inserting plate to rise along the vertical slot through the inserting plate lug, and increase the height of the pre-drying overflow port. , tighten the lock nut to fix the height of the adjustable board. Conversely, turn the adjusting nut to the left, and the adjustable board will descend along the vertical slot. The pre-drying overflow port is equipped with an adjustable insert, which can adjust the pre-drying time of each layer according to the difference in output and material moisture, adapt to the needs of production in a wider range, reduce the difficulty of adjustment of indicators, and has strong adaptability.

As a further improvement of the present invention, the upper outer side wall of the pre-drying chute is provided with a sampling inspection door, and the middle section of the pre-drying chute is provided with a wind rotary valve. Through the sampling inspection door, it is very convenient to sample and analyze the discharge material, and check and observe the pre-drying condition of each layer and the fluidity of the material at any time. , and effectively cut off the airflow between the upper and lower layers to form an independent and stable drying space.

As a further improvement of the present invention, a flange connection seat is fixed at the center of the lower end face of the bottom wall of the pre-drying tower, a reducer is connected to the lower end of the flange connection seat, and the lower end of the main shaft is connected to the lower end of the pre-drying tower. The center of the bottom wall protrudes out, extends downward along the axis of the flange connection seat, and is connected with the output end of the reducer, and the input shaft of the reducer is driven by a spindle motor. The spindle motor drives the main shaft to rotate through the reducer. The multi-layer pre-drying tower adopts a shaft-mounted reducer. The reducer is directly installed on the bottom plate of the pre-drying tower through the flange connection seat. The installation structure is compact, which reduces civil construction and saves costs. .

As a further improvement of the present invention, a plurality of infrared radiation drying lamps are evenly installed on the top of the first pre-drying layer. The infrared radiation drying lamp can cooperate with hot air to pre-dry the material to form double drying and reduce the subsequent drying intensity.

As a further improvement of the present invention, the horizontal multi-stage fluidized bed includes a rectangular shell, the lower part of the tail end of the rectangular shell is provided with a fluidized bed outlet, and the lower part of the inner cavity of the rectangular shell is provided with A rectangular sieve plate extending from the feeding end to the discharging end, the rectangular sieve plate is evenly distributed with multiple louver helical grooves, and the air outlet direction of the louver helical groove is consistent with the direction of the material. The rectangular sieve plate of the horizontal multi-stage fluidized bed is evenly distributed with multiple louver helical grooves, and the air flow is blown out from each louver helical groove. Since the direction of the air flow is consistent with the direction of the material, it drives the material to move toward the discharge port, and realizes the flow of the material. First in, first out, so that the drying time of the material is uniform, and the quality is uniform and guaranteed.

As a further improvement of the present invention, the rectangular sieve plate is at least divided into a fluidized bed drying section and a fluidized bed cooling section along the advancing direction of the material, and the lower cavity space of the fluidized bed drying section is connected with the hot air net, so The lower cavity space of the cooling section of the fluidized bed is connected with a cooling air network, and the hot air network and the cooling air network are distributed on one side or both sides of the rectangular shell. The hot air network includes a hot air main pipe and a plurality of hot air branch pipes. The hot air enters each hot air branch pipe from the hot air main pipe, and is blown out from the bottom of the rectangular sieve plate from each hot air branch pipe. The front part of the horizontal multi-stage fluidized bed can use multiple groups of hot air For the air net, different groups of hot air net adopt different drying temperatures; as the drying time of the material is different, the viscosity and moisture decrease to form different drying strengths. The rear of the horizontal multi-stage fluidized bed can use multiple sets of cooling air nets, and different groups of cold air nets use different cooling temperatures to form different cooling intensities. The wind net is arranged on one side or on both sides, which can be flexibly adapted to the space on site.

As a further improvement of the present invention, the top of the rectangular shell is provided with at least a drying section air outlet hood and a cooling section air outlet hood, and the drying section air outlet hood and the cooling section air outlet hood are respectively inclined toward the discharge end. The air outlet hood of the drying section and the air outlet hood of the cooling section are inclined towards the discharge end, so that the air flow is directed to the direction of the discharge port of the fluidized bed, and the air flow carries the material to the direction of the discharge port to reduce the disturbance of the air flow and the air flow. At the same time, the air outlets with different moisture contents can be connected to different air network systems, so that the air network system can be processed in a targeted manner, recover heat, reduce energy consumption, and reduce processing difficulty.

Description of drawings

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings are only for reference and illustration purposes, and are not intended to limit the present invention.

FIG. 1 is a front view of the first embodiment of the multi-stage fluidization tower of the present invention.

FIG. 2 is a perspective view of FIG. 1 .

Fig. 3 is the front view of the pre-drying tower in the second embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along C-C in FIG. 3 .

FIG. 5 is a perspective view of the middle-material rake-type stirring fin of the present invention.

6 is a front view of the circular sieve plate of the pre-drying tower in the present invention.

7 is a top view of the circular sieve plate of the pre-drying tower in the present invention.

FIG. 8 is a partial enlarged view of the position of the adjustable insert plate in FIG. 3 .

FIG. 9 is a front view of the rectangular screen plate of the horizontal multi-stage fluidized bed in the present invention.

FIG. 10 is a plan view of FIG. 9 .

In the figure: A. Pre-drying tower; 1. The first pre-drying layer; 1a. The air outlet of the first pre-drying layer; 1b. The feeding chute; 1c. 1e. Pre-drying chute; 1f. Sampling inspection door; 1g. Air shut-off rotary valve; 2. The first interlayer air chamber; 2a. The first pre-drying air inlet; 2b. 3a. The second pre-drying layer air outlet; 3b. The second pre-drying overflow port; 4. The second interlayer air chamber; 4a. The second pre-drying air inlet; 4b. Sieve plate; 5a. Fish scale hole in sieve plate; 6. Spindle; 6a. Rake stirring fin; 6b. Cleaning scraping fin; 7. Reducer; 7a. Spindle motor; 9. Adjusting screw; 9a. Adjusting nut; 9b. Locking nut; 9c. Screw seat; 10. Interlayer discharge port; 11. Infrared radiation drying lamp.

B. Horizontal multi-stage fluidized bed; 12. Rectangular shell; 13. Fluidized bed outlet; 14. Rectangular sieve plate; 14a. 17. Air outlet hood for drying section; 18. Air outlet hood for cooling section. 19. Pressure gauge measuring point; 20. Temperature sensor measuring point; 21. Thermometer measuring point; 22. Scraper sight glass.

detailed description

As shown in Fig. 1 to Fig. 5, the multi-stage fluidized tower of the present invention includes a pre-drying tower A and a horizontal multi-stage fluidized bed B. A main shaft 6 is provided along the axis of the pre-drying tower A. The inner cavity is sequentially provided with a first pre-drying layer 1, a first interlayer air chamber 2, a second pre-drying layer 3 and a second interlayer air chamber 4, and the first interlayer air chamber 2 and the second interlayer air chamber 4 Circular sieve plates 5 are respectively provided on the top of the first pre-drying layer 1 and the circular sieve plates of the second pre-drying layer 3 are respectively provided with rake type stirring fins 6a, and the material rake type stirring fins 6a are fixed on the main shaft 6 The side wall of the first interlayer air chamber 2 is provided with the first pre-drying air inlet 2a, and the top center of the first pre-drying layer 1 is provided with the first pre-drying layer air outlet 1a; There is a second pre-drying air inlet 4a, the upper cylinder wall of the second pre-drying layer 3 is provided with a second pre-drying layer air outlet 3a; the side wall of the first pre-drying layer 1 is connected with a feeding chute 1b and a first pre-drying layer. The drying overflow port 1d, the outlet of the feeding chute 1b is provided with a dispersing device 1c, and the first pre-drying overflow port 1d is connected to the feeding port on the cylinder wall of the second pre-drying layer 3 through the pre-drying chute 1e; The cylinder wall of the second pre-drying layer 3 is further provided with a second pre-drying overflow port 3b, and the second pre-drying overflow port 3b is opposite to the feed port of the horizontal multi-stage fluidized bed B.

The fresh and moist fermented feed falls along the feeding chute 1b, and is first dispersed by the dispersing device 1c. The agglomeration of the material is broken and then falls on the circular sieve plate of the first pre-drying layer 1, and then is stirred by the material rake. The fins 6a are rotated and spread, which is beneficial for the wet material to be evenly spread on the sieve plate for pre-drying. The main shaft 6 drives the rake-type stirring fin 6a to rotate, and the material-rake-type stirring fin 6a spreads the material on the first layer of circular sieve plate, and the first-stage preheating air enters the first interlayer air chamber from the first pre-drying air inlet 2a In 2, the air is blown upward from the air holes on the circular sieve plate 5, and the material is in direct contact with the material for sufficient heat exchange, and the material is pre-dried in the first stage. The air outlet 1a of the first pre-drying layer is discharged. Due to the large proportion of wet materials and the small proportion of dry materials, under the action of stirring and wind, the lighter dry materials slowly float on the upper layer. It flows out, enters the second pre-drying layer 3 through the pre-drying chute 1e and falls on the circular sieve plate of the second pre-drying layer 3, and the rake-type stirring fins 6a spread the material on the second layer of the circular sieve plate , the secondary preheated air enters the second interlayer air chamber 4 from the second pre-drying air inlet 4a, and is blown upward from the air holes on the circular sieve plate to perform secondary pre-drying. The material after the secondary pre-drying is discharged from the second pre-drying overflow port 3b, and enters the horizontal multi-stage fluidized bed B for further drying and cooling.

Set the number of pre-drying layers according to the actual situation of the material. For materials with high moisture content, you can set up multiple pre-drying layers to ensure that the first dried material overflows into the next layer for re-drying, and there is no need to add dry materials to the raw materials. . And the wet material that has just entered falls on the material that has been initially dried, reducing the chance of sticking to the circular sieve plate. The multi-stage fluidized tower adopts the combination of multi-layer pre-drying tower A and horizontal multi-stage fluidized bed B, which can effectively solve the problem of difficult drying of viscous materials. The sticky material is pre-dried, and after pre-drying, the horizontal multi-stage fluidized bed B is used for further drying and cooling, which is beneficial for the material to flow to the discharge end step by step under the impetus of air flow, so as to avoid sticky material.

When pre-drying in the pre-drying tower A, there is no need to mix the finished dry material with the fresh wet material, no need to return the dry material, and at the same time, there is no need to increase the conveying equipment for transfer, which reduces material pollution and energy consumption; Repeated drying of the material, the dry material overflows first during pre-drying, realizes the first-in, first-out of the material, and ensures the drying time of the material is the same, and the quality of the material is high and uniform.

The pre-drying tower A adopts at least two layers of structure, sharing a set of stirring devices, and stirring through each layer from bottom to top to form multi-level pre-drying with different gradients. The pre-drying is sufficient and reduces the floor space and maintenance failure points. A pressure gauge measuring point 19 , a temperature sensor measuring point 20 , and a thermometer measuring point 21 are respectively provided on the cylinder wall of each pre-drying layer for installing the pressure gauge, the temperature sensor and the temperature gauge. The pressure gauge measuring point 19 is located above the material layer near the air outlet, and the temperature sensor measuring point 20 and the temperature gauge measuring point 21 are both in contact with the material, so that different drying temperatures can be used for each pre-drying layer. The temperature sensor can remotely transmit the actual temperature of the material to the control room, and can realize automatic control after interlocking with the inlet air temperature. At the same time, the operator in the control room can intuitively understand the actual temperature on site and can also adjust manually; the temperature gauge and pressure gauge can be It is convenient for field operators to understand the actual temperature and wind pressure on site, and it is convenient for production situation and index control.

As shown in FIG. 3 , the upper outer side wall of the pre-drying chute 1e is provided with a sampling inspection door 1f, and the middle section of the pre-drying chute 1e is provided with a wind rotary valve 1g. Through the sampling inspection door 1f, it is very convenient to sample and analyze the discharged material, and check and observe the pre-drying status of each layer and the fluidity of the material at any time; It can effectively cut off the airflow between the upper and lower layers to form an independent and stable drying space.

As shown in FIGS. 3 and 4 , the bottom walls of the first interlayer air chamber 2 and the second interlayer air chamber 4 are respectively provided with interlayer discharge ports 10 , and below each interlayer discharge port 10 are respectively provided with a discharge shut-off air The top of the bottom wall of the first interlayer air chamber 2 and the second interlayer air chamber 4 are respectively provided with cleaning scraping fins 6b, and the cleaning scraping fins 6b are respectively fixed on the main shaft 6. A small amount of material leaking into the first interlayer air chamber 2 and the second interlayer air chamber 4 is scraped into the interlayer discharge port 10 by the cleaning scraping fins 6b, and is discharged into the next layer or discharged through the discharge air shutoff device, so that each interlayer is discharged. The air chamber has a self-cleaning function.

The first pre-drying air inlet 2a and the second pre-drying air inlet 4a respectively take in the air along the tangential direction, the first pre-drying air inlet 2a is provided with an air inlet louver 1 2b, and the second pre-drying air inlet 4a is provided with air intake The second louver 4b, the first air inlet louver 2b and the second air inlet louver 4b are inclined toward the advancing direction of the cleaning and scraping fins 6b. When the cleaning scraping fin 6b rotates, the material is easy to splash upward under the action of centrifugal force. Once it enters the pre-drying air duct, it is difficult to remove. Long-term operation will easily lead to the reduction of the ventilation section. When the accumulated material is stopped for a long time, it is easy to produce mildew. change, causing pollution to the system; setting air inlet shutters can prevent materials from entering the pre-drying air inlet duct.

As shown in Figures 6 and 7, the circular sieve plates 5 of the first pre-drying layer 1 and the second pre-drying layer 3 are respectively evenly distributed with laterally open sieve plate fish scale holes 5a, and the sieve plate fish scale holes 5a of each sieve plate The orientation is consistent with the rotation direction of the rake-type stirring fins 6a. Once the wet and sticky fine materials fall into the sieve holes, it is easy to block the sieve holes, and it is difficult to clean up, affecting the air outlet and causing material leakage. The pre-drying layer adopts fish scale hole sieve plate instead of the traditional straight hole sieve plate. The rake type stirring fin 6a drives the material to pass over the top of the fish scale hole 5a of each sieve plate, and the preheating air is blown out in the direction of the material advance, which can effectively prevent the material It leaks into the interlayer air chamber of the pre-drying layer; the leakage prevention effect is especially obvious for powdery materials with small particle size.

As shown in Fig. 3 and Fig. 8, the first pre-drying overflow port 1d and the second pre-drying overflow port 3b are respectively equipped with adjustable plug boards 8, and the two sides of the adjustable plug boards 8 are respectively embedded in the corresponding vertical In the slot, the upper ends of the adjustable plug-in board 8 are respectively welded with plug-in board support lugs 8a, the plug-in board support lugs 8a are fixed on the lower end of the adjustment screw 9, the upper part of the adjustment screw 9 passes through the light hole of the screw base 9c, and the screw The seat 9c is welded on the inner wall of the pre-drying tower body, the adjusting screw 9 is screwed with an adjusting nut 9a and a locking nut 9b, the adjusting nut 9a is pressed on the upper end face of the screw seat 9c, and the locking nut 9b is pressed on the screw seat 9c. lower end face. Loosen the locking nut 9b and turn the adjusting nut 9a to the right, then the adjusting screw 9 rises, and the lower end of the adjusting screw 9 drives the adjustable plug 8 to rise along the vertical slot through the plug lug 8a, and the pre-drying overflow port is moved upward. After the height is raised and adjusted properly, tighten the locking nut 9b to fix the height of the adjustable plug board 8 . Conversely, if the adjusting nut 9a is turned leftward, the adjustable plug-in board 8 will descend along the vertical slot. The pre-drying overflow port is equipped with an adjustable board 8, which can adjust the pre-drying time of each layer according to the difference in output and material moisture, adapt to the needs of production in a wider range, reduce the difficulty of index adjustment, and has strong adaptability .

As shown in FIG. 3 , the center of the lower end surface of the bottom wall of the pre-drying tower A is fixed with a flange connection seat 7b, the lower end of the flange connection seat 7b is connected with a reducer 7, and the lower end of the main shaft 6 is from the center of the bottom wall of the pre-drying tower A. Passing out, extending downward along the axis of the flange connection seat 7b and connected with the output end of the reducer 7, the input shaft of the reducer 7 is driven by the spindle motor 7a. The main shaft motor 7a drives the main shaft 6 to rotate through the reducer 7. The multi-layer pre-drying tower adopts the shaft-mounted reducer 7, and the reducer 7 is directly installed on the bottom plate of the pre-drying tower through the flange connection seat 7b. Civil construction, saving costs.

A plurality of infrared radiation drying lamps 11 are evenly installed on the top of the first pre-drying layer 1 . The infrared radiation drying lamp 11 can cooperate with hot air to pre-dry the material to form double drying and reduce the subsequent drying intensity.

As shown in FIG. 1 and FIG. 2 , the horizontal multi-stage fluidized bed B includes a rectangular shell 12 . The lower part of the rear end of the rectangular shell 12 is provided with a fluidized bed outlet 13 , and the lower part of the inner cavity of the rectangular shell 12 is provided with a fluidized bed outlet 13 . There is a rectangular screen plate 14 extending from the feed end to the discharge end. The rectangular screen plate 14 is at least divided into a fluidized bed drying section and a fluidized bed cooling section along the advancing direction of the material. The lower cavity space of the fluidized bed drying section is connected to the hot air net 15, and the lower cavity space of the fluidized bed cooling section is connected to The cooling air nets 16 are connected, and the hot air nets 15 and the cooling air nets 16 are distributed on one side or both sides of the rectangular housing 12 .

Each stage of drying in the horizontal multi-stage fluidized bed B is equipped with a temperature sensor and a thermometer, and both the temperature sensor and the thermometer are in contact with the material.

The hot air network 15 includes a hot air main pipe and a plurality of hot air branch pipes. The hot air enters each hot air branch pipe from the hot air main pipe, and is blown out from the bottom of the rectangular sieve plate 14 from each hot air branch pipe; There are multiple groups of hot air nets 15, and different groups of hot air nets 15 use different drying temperatures; as the drying time of the material is different, the viscosity and moisture decrease to form different drying strengths. The rear part of the horizontal multi-stage fluidized bed B can adopt multiple sets of cooling air nets 16, and different groups of cold air nets can adopt different cooling temperatures to form different cooling intensities. The wind net is arranged on one side or on both sides, which can be flexibly adapted to the space on site.

The top of the fluidized bed drying section can also be provided with an infrared radiation drying lamp 11 to double-dry the material and improve the drying intensity.

The top of the rectangular shell 12 is provided with at least a drying section air outlet hood 17 and a cooling section air outlet hood 18, and the drying section air outlet hood 17 and the cooling section air outlet hood 18 are respectively inclined toward the discharge end. The air outlet hood 17 of the drying section and the air outlet hood 18 of the cooling section are inclined towards the discharge end, so that the air flow is directed towards the direction of the discharge port 13 of the fluidized bed. At the same time, the air outlets with different moisture contents can be connected to different air network systems, so that the air network system can be processed in a targeted manner, recover heat, reduce energy consumption, and reduce the difficulty of processing.

The air outlet hood 17 of the drying section and the air outlet hood 18 of the cooling section can be oblique triangles, and the side near the discharge is a vertical plane, and the top wall is an inclined surface; Such a structure makes the air flow only advance toward the discharge end in the inner cavity of the shell, without the interference of the reverse air flow. The closer to the discharge end, the drier the material, the easier it is for small particles to be taken away by the air flow, and the slope of the top of the air outlet hood is lowered, which is conducive to throwing the small particles back to the sieve plate before the air flow out of the air outlet hood, reducing the loss of materials and dust emissions.

As shown in FIGS. 9 and 10 , there are multiple louver helical grooves 14a evenly distributed on the rectangular screen plate 14, and the air outlet direction of the louver helical grooves 14a is consistent with the direction of the material. The rectangular sieve plate 14 of the horizontal multi-stage fluidized bed B is evenly distributed with multiple louver helical grooves 14a, and the airflow is blown out from each louver helical groove 14a. Since the direction of the airflow is consistent with the direction of the material, it drives the material to move toward the discharge port , to realize the first-in first-out of the material, so that the drying time of the material is uniform and the quality is uniform and guaranteed.

A scraper sight glass 22 is respectively arranged above the material layer of each pre-dried layer, and a plurality of scraper sight glasses 22 are also distributed above the material layer of the rectangular sieve plate 14 to observe the condition of the material layer.

The above descriptions are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the patent protection of the present invention. In addition to the above-described embodiments, the present invention may also have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not repeated here.

Claims

A multi-stage fluidization tower, including a pre-drying tower, is characterized in that: a main shaft is arranged along the axis of the pre-drying tower, and a first pre-drying layer, a first pre-drying layer, a first pre-drying layer, a first The interlayer air chamber, the second pre-drying layer and the second interlayer air chamber, the tops of the first interlayer air chamber and the second interlayer air chamber are respectively provided with circular sieve plates, and the circular sieve plates of the first and second pre-drying layers A rake-type stirring fin is respectively provided above, and the material-rake-type stirring fin is fixed on the main shaft; the side wall of the first interlayer air chamber is provided with a first pre-drying air inlet, and the first pre-drying layer is provided with a first pre-drying air inlet. The top center is provided with a first pre-drying layer air outlet; the side wall of the second interlayer air chamber is provided with a second pre-drying air inlet, and the upper cylinder wall of the second pre-drying layer is provided with a second pre-drying layer outlet. A tuyere; the side wall of the first pre-drying layer is connected with a feeding chute and a first pre-drying overflow port, the outlet of the feeding chute is provided with a dispersing device, and the first pre-drying overflow port passes through the pre-drying overflow port. The drying chute is connected with the feeding port on the cylinder wall of the second pre-drying layer; the cylinder wall of the second pre-drying layer is also provided with a second pre-drying overflow port.
The multi-stage fluidization tower according to claim 1, wherein the circular sieve plates of the first pre-drying layer and the second pre-drying layer are respectively uniformly distributed with laterally open sieve plate fish scale holes, and each The orientation of the fish scale holes of the sieve plate is consistent with the rotation direction of the rake-type stirring fins.
The multi-stage fluidization tower according to claim 1, wherein the bottom walls of the first interlayer air chamber and the second interlayer air chamber are respectively provided with interlayer discharge ports, and the bottom of each interlayer discharge port is respectively A discharge air shutoff device is provided; cleaning scraping fins are respectively provided above the bottom walls of the first interlayer air chamber and the second interlayer air chamber, and the cleaning and scraping fins are respectively fixed on the main shaft.
The multi-stage fluidization tower according to claim 3, wherein the first pre-drying air inlet and the second pre-drying air inlet are respectively provided with air inlet louvers, and each window blade of the air inlet louver is directed toward The advancing direction of the cleaning scraper fins is inclined.
The multi-stage fluidization tower according to claim 1, wherein the first pre-drying overflow port and the second pre-drying overflow port are respectively equipped with adjustable plugs, and two of the adjustable plugs The sides are respectively embedded in the corresponding vertical slots, the upper ends of the adjustable plug-in boards are respectively welded with plug-in lugs, the plug-in lugs are fixed on the lower ends of the adjustment screws, and the upper parts of the adjustment screws extend from the screw seat. The screw seat is welded on the inner wall of the pre-drying tower body, the adjusting screw is screwed with an adjusting nut and a locking nut, and the adjusting nut is pressed on the screw seat The end face, the locking nut is pressed against the lower end face of the screw base.
The multi-stage fluidization tower according to claim 1 is characterized in that: the upper outer side wall of the pre-drying chute is provided with a sampling inspection door, and the middle section of the pre-drying chute is provided with a relevant air rotary valve.
The multi-stage fluidization tower according to claim 1, characterized in that: a flange connection seat is fixed in the center of the lower end face of the bottom wall of the pre-drying tower, and a reducer is connected to the lower end of the flange connection seat, and the The lower end of the main shaft passes through the center of the bottom wall of the pre-drying tower, extends downward along the axis of the flange connection seat and is connected to the output end of the reducer, the input shaft of which is driven by the main shaft motor .
The multi-stage fluidization tower according to claim 1, wherein a plurality of infrared radiation drying lamps are evenly installed on the top of the first pre-drying layer.
The multi-stage fluidized tower according to any one of claims 1 to 8, wherein the horizontal multi-stage fluidized bed comprises a rectangular shell, and the lower part of the tail end of the rectangular shell is provided with a fluidized The discharge port of the bed, the lower part of the inner cavity of the rectangular shell is provided with a rectangular sieve plate extending from the feeding end to the discharging end. The outlet direction of the tooth slot is consistent with the direction of the material.
The multi-stage fluidization tower according to claim 9, wherein the rectangular sieve plate is at least divided into a fluidized bed drying section and a fluidized bed cooling section along the advancing direction of the material, and the fluidized bed drying section has The lower cavity space is connected with the hot air net, the lower cavity space of the fluidized bed cooling section is connected with the cooling air net, and the hot air net and the cooling air net are distributed on one side or both sides of the rectangular shell.
The multi-stage fluidization tower according to claim 10, wherein the top of the rectangular shell is provided with at least a drying section air outlet cover and a cooling section air outlet cover, and the drying section air outlet cover and the cooling section air outlet cover The hoods are respectively inclined towards the discharge end.