CN215113537U - Fluidized bed based on novel control mode - Google Patents

Abstract

The utility model relates to a fluidized bed based on a novel control mode, which comprises a fluidized bed body, a main air duct, an air duct, a valve, a driving piece and an air hopper, wherein the middle part of the fluidized bed body is provided with a bed board, the bed board is provided with a plurality of through holes, through-hole axis slope and incline direction partial discharge gate, total wind channel erect in fluidized bed body bottom and follow supreme communicating with each other with dryer, valve and hopper in proper order down, total wind channel is equipped with the air inlet machine outward, the fluidized bed is equipped with the exhaust fan outward, the exhaust fan communicates with each other with fluidized bed upper portion, and the wind speed carries out the frequency conversion through controller and converter and adjusts in total wind channel, and the driving piece links to each other with the valve in order to control the wind-force size that passes through the wind hopper, the utility model has the advantages of can prevent the material to see through in the hole on the bed board falls into the hopper or the total wind channel of bed board below, can solve through the switch of automatic control orifice plate valve again and run the powder, collapse the bed problem.

Description

Fluidized bed based on novel control mode

Technical Field

The utility model relates to a fluidized bed technical field especially relates to a fluidized bed based on novel control mode.

Background

The fluidized bed is a drying device which is common in the pharmaceutical industry at present, and the fluidized bed mainly has the function of drying wet granules mixed in a wet granulation machine or a continuous granulator. Wet particles enter the bed body from a feed port of the fluidized bed and are flatly laid on a bed plate of the fluidized bed, hot air is introduced into an air hopper or a main air duct below the bed plate, the hot air is blown in from the lower part of the bed plate, the materials are blown to enable the materials to be in a boiling state and to exchange heat with the materials, the materials are dried, meanwhile, the hot air in the bed body is continuously discharged from the top of the fluidized bed, and the hot air is ensured to be continuously blown in the bed plate to completely dry the materials. The bed board mostly uses the form of straight holes, inclined holes or full inclined holes, so that the hot air can push the materials to move towards the direction of the discharge hole while blowing the materials to boil.

In the material drying process, a large amount of hot air is needed to flow through the bed plate to exchange heat with the material, so that the area of the opening of the bed plate is needed to be large enough to ensure the ventilation quantity. There are two ways to increase the open area: firstly, the diameter of a single hole is increased, and secondly, the number of holes is increased. At present, holes of 1-4mm are mostly formed in the bed plate, and materials to be dried have small diameters and easily enter an air hopper below the bed plate through the holes, so that the problem of material leakage can occur.

And in order to make the material reach the boiling state, a large amount of hot air is needed to enter the boiling drying cavity through the bed plate to blow the material, and meanwhile, the exhaust fan continuously sucks out the hot air from the boiling drying cavity, so that if the air intake and exhaust are too large, fine powder is easily sucked out, and the problem of powder leakage can occur. And if the air intake and the air exhaust are too small, the problem that the materials cannot be boiled and collapse bed occurs.

Therefore, in response to the above deficiencies, it would be desirable to provide a fluidized bed based on a novel control scheme.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The to-be-solved technical problem of the utility model is to solve the problem that current fluidized bed can not solve simultaneously and leak the material, run powder and bed collapse.

(II) technical scheme

In order to solve the technical problem, the utility model provides a fluidized bed based on novel control mode, the material boiling of fluidized bed sets up three kinds of modes altogether, specifically is:

suspension mode: the upper plane of the material is locally fluctuated, and the material does not flow into the wind scoop;

micro-boiling mode: the upper plane of the material is in an undulating state;

strong boiling mode: the upper plane of the material is locally fluctuated, and the fluctuation height of the material is greater than that of the material in a suspension mode and a micro-boiling mode, so that the material is not adhered.

As a further explanation of the present invention, preferably, the bed plate is divided into a plurality of regions by a plurality of wind scoops, and each region can realize a suspension mode, a micro-boiling mode and a strong boiling mode.

As a further explanation of the present invention, preferably, a valve is provided under the wind scoop, and when the valve is closed, gas still flows into the wind scoop; under the condition that the air volume in the main air duct is not changed,

when the number of the opened valves accounts for 1-30% of the total number, the material right above the closed valves is in a suspension mode, and the material right above the opened valves is in a strong boiling mode;

when the valves with the odd numbers are all opened, the valves with the even numbers are all closed, the material right above the valve in the opening state is in a micro boiling mode, and the material right above the valve in the closing state is in a suspension mode.

As right the utility model discloses a further explanation, preferably, every wind scoop bottom all is equipped with the fan, and the amount of wind in the fan passes through frequency conversion control inflow wind scoop.

As a further explanation of the invention, the number and duration of the opening of the valves are preferably controlled by a program; or adjusting the on-power and duration of the fan.

(III) advantageous effects

The above technical scheme of the utility model has following advantage:

1. the utility model discloses a design simple and easy control system and solve leak whitewashed, run whitewashed, the bed problem of collapsing:

a) when the valve is closed, a small amount of hot air is blown into the fluidized drying cavity through the air hopper and the bed plate to blow materials, so that the materials are in a suspension state, the materials are prevented from falling into the air hopper and the air duct through holes of the bed plate, and the powder leakage problem is solved;

b) when half of the valves are opened, the materials are in a micro-boiling state, so that a large amount of fine powder is prevented from floating to the top of the cavity of the boiling bed, and the problem of powder leakage is solved, so that various filters arranged in the boiling bed can be omitted, the amount of fine powder discharged from the boiling drying cavity is reduced, the structure is simplified, and the cost is reduced;

c) when the valves with small quantity are opened from a closed state, a large amount of hot air is blown into the boiling drying cavity through the air hopper and the bed plate in a short time, so that the materials enter a strong boiling mode to impact the materials above the bed plate, the materials stuck together can be effectively dispersed, the problem of material hardening is solved, large particles are reduced, and the qualification rate of the dried materials is improved; meanwhile, the hardened materials are dispersed by strong air flow, and the problem of bed collapse is solved.

2. The workload of manual assistance during the operation of the system is reduced in the control mode, and the system can automatically operate and adjust.

Drawings

FIG. 1 is a view showing the structure of a first embodiment of the present invention;

FIG. 2 is a structural view of a second embodiment of the present invention;

FIG. 3 is a view showing the structure of a third embodiment of the present invention;

fig. 4 is a material state diagram under three modes of the present invention.

In the figure: 1. a fluidized bed body; 11. a wind pressure sensor; 12. a fluidized drying chamber; 13. a bed board; 14. a network channel; 15. a pressure sensor; 2. a main air duct; 3. an air duct; 4. a valve; 5. a drive member; 6. an air scoop.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

A fluidized bed based on a novel control mode is provided with three modes, specifically:

1. when the upper plane of the material is locally fluctuated, the fluidized bed is in a suspension mode, and the material does not flow into the wind scoop 6;

2. when the upper plane of the material is in a fluctuating state, the fluidized bed is in a micro-boiling mode, and the material is attached to the bed plate 13 and does not flow into the air hopper 6;

3. when the upper plane of the material is locally fluctuated and the fluctuation height of the material is larger than the fluctuation height of the material in the suspension mode and the micro-boiling mode, the fluidized bed is in the strong boiling mode, and the surrounding materials are not adhered.

As shown in fig. 4, hot air flows in the air scoop 6, and blows up the material through the holes on the bed plate 13 to undulate relative to the plane of the paving material, and simultaneously, according to various physical properties of the material in the fluidized bed, the air volume in the air scoop 6 is controlled to realize different undulation heights of the material. Meanwhile, according to various physical properties of the materials, the duration and the switching time of various modes are controlled by a program so as to better dry the materials.

The utility model provides a three kinds of embodiments are in order to realize above-mentioned three kinds of modes and verify its effect.

The first method comprises the following steps: as shown in fig. 1, the air-flow-type fluidized bed comprises a fluidized bed body 1, a main air duct 2, an air duct 3, a valve 4, a driving member 5 and an air hopper 6, wherein the main air duct 2 is erected at the bottom of the fluidized bed body 1 and is sequentially communicated with the air duct 3, the valve 4 and the air hopper 6 from bottom to top, an air inlet fan is arranged outside the main air duct 2, an exhaust fan is arranged outside the fluidized bed body 1 and is communicated with the upper part of the fluidized bed, and the air speed in the main air duct 2 is controlled by the air inlet fan or by the air inlet fan and the exhaust fan together. The wind speed in the main wind channel 2 is adjusted by frequency conversion through a controller and a frequency converter, a driving part 5 is connected with the valve 4, in this embodiment, the driving part 5 is a rotary cylinder or a motor.

As shown in fig. 1, a bed plate 13 is arranged in the middle of a fluidized bed body 1, a plurality of through holes are formed in the bed plate 13, and the axes of the through holes are inclined and the inclined direction of the through holes is deviated to a discharge hole; the probability that the material enters the air hopper is reduced, and the material can be blown to move towards the discharge hole. The wind scoop 6 is connected with the bed board 13, and the inner cavity of the wind scoop 6 is communicated with the through hole on the bed board 13. The space between the bed plate 13 and the feed inlet is a boiling drying chamber 12, materials can pass through the boiling drying chamber 12 from the feed inlet and fall on the bed plate 13, the upper part of the boiling drying chamber 12 is provided with a plurality of wind pressure sensors 11 for measuring the air pressure passing through the materials, and the wind speed of the air passing through the materials can be calculated through the measured wind pressure by a Bernoulli equation. The main air duct 2 is a straight tube pipeline, the length direction of the main air duct 2 is the same as the length direction of the bed board 13, a plurality of air ducts 3 are distributed on the main air duct 2 at intervals along the length direction of the main air duct 2, and the air ducts 3 are communicated with the main air duct 2. The valve 4 is in a circular tube shape, the valve 4 is inserted at the top of the air duct 3, the fixed end of the driving piece 5 is fixed on the side wall of the fluidized bed body 1, the output end of the driving piece 5 is fixedly connected with a rotating shaft through a connecting rod, a valve plate is fixedly connected on the rotating shaft, the valve plate is in a disc shape, air holes can be opened on the valve plate, and the distribution range of the air holes is in direct proportion to the area of the air hopper 6 connected with the valve 4 covering the bed plate 13; the shape of the air holes can be round or polygonal, the distribution form of the air holes can be annular, in-line or in a divergent form, and the shape, the caliber and the distribution form of the air holes are adaptively designed according to the material characteristics and the scale of the bed plate 13, so that the fluidized bed can achieve the highest drying efficiency by using the least energy.

And the second method comprises the following steps: as shown in fig. 2, the air-flow-type fluidized bed comprises a fluidized bed body 1, a main air duct 2, an air duct 3, a valve 4, a driving member 5 and an air hopper 6, wherein the main air duct 2 is erected at the bottom of the fluidized bed body 1 and is sequentially communicated with the air duct 3, the valve 4 and the air hopper 6 from bottom to top, an air inlet fan is arranged outside the main air duct 2, an air exhaust fan is arranged outside the fluidized bed body 1 and is communicated with the upper part of the fluidized bed, and the air speed in the main air duct 2 is controlled by the air inlet fan or by the air inlet fan and the air exhaust fan together. The wind speed in the main wind channel 2 is adjusted by frequency conversion through a controller and a frequency converter, a driving part 5 is connected with the valve 4, and in the embodiment, the driving part 5 adopts a motor.

As shown in fig. 2, a bed plate 13 is arranged in the middle of the fluidized bed body 1, a plurality of through holes are formed in the bed plate 13, and the axes of the through holes are inclined and the inclined direction of the through holes is deviated to a discharge hole; the wind scoop 6 is connected with the bed board 13, and the inner cavity of the wind scoop 6 is communicated with the through hole on the bed board 13. The space between the bed plate 13 and the feed inlet is a boiling drying chamber 12, materials can pass through the boiling drying chamber 12 from the feed inlet and fall on the bed plate 13, and the upper part of the boiling drying chamber 12 is provided with a plurality of wind pressure sensors 11. General wind channel 2 is straight section of thick bamboo pipeline, 2 length direction in general wind channel is the same with 13 length direction in bed board, 2 length direction interval distribution in general wind channel 2 are followed to a plurality of dryer 3, dryer 3 communicates with each other with general wind channel 2, valve 4 is the pipe form, the valve plate appearance is the square slice shape, be equipped with the clearance between valve plate and the 4 inner walls of valve, can also both set up the gas pocket on the valve plate and be equipped with the clearance between the 4 inner walls of valve, the diversified design of valve plate helps the fluidized bed can carry out different leak protection material to the material of different particle diameters and handle, compare current flow valve 4 low in manufacturing cost, it is more convenient to change the maintenance. The square valve plate is arranged, the design size can be similar to that of an inscribed quadrangle of the inner cavity of the valve 4, through reasonable side length design, hot air can flow through the bed plate 13 and enter the boiling drying cavity 12 without punching on the valve plate, and processing cost is saved.

And the third is that: as shown in fig. 3, the fluidized bed comprises a fluidized bed body 1, an air duct 3, a fan and an air hopper 6, wherein the fan, the air duct 3 and the air hopper 6 are sequentially connected with the bottom of the fluidized bed body 1 from bottom to top, an exhaust fan is arranged outside the fluidized bed body 1 and communicated with the upper part of the fluidized bed, and the air speed in the air duct 3 is controlled by the fan or by the fan and the exhaust fan together. The power of the fan is adjusted by frequency conversion through the controller and the frequency converter, so that the effect of controlling the air volume in the air duct 3 and the air hopper 6 is realized.

As shown in fig. 3, a bed plate 13 is arranged in the middle of the fluidized bed body 1, a plurality of through holes are formed in the bed plate 13, the outer diameters of the through holes are larger than those of the through holes of the bed plate 13 of the first fluidized bed and the second fluidized bed, and the axes of the through holes are inclined and the inclined direction of the through holes is deviated to a discharge hole; the wind scoop 6 is connected with the bed board 13, and the inner cavity of the wind scoop 6 is communicated with the through hole on the bed board 13. The space between the bed plate 13 and the feed inlet is a boiling drying chamber 12, materials can pass through the boiling drying chamber 12 from the feed inlet and fall on the bed plate 13, and the upper part of the boiling drying chamber 12 is provided with a plurality of wind pressure sensors 11. A plurality of wind cylinders 3 are distributed at intervals at the lower part of the wind scoop 6 along the length direction of the bed plate 13, and the wind cylinders 3 are communicated with the wind scoop 6. The fan is installed on the dryer 3 outside the fluidized bed body 1, and is external, can be convenient for change the maintenance at any time to need not to consider the complicated dismantlement environment in the fluidized bed body 1 below when the dismouting, the staff of being convenient for operates.

As shown in fig. 3, a mesh duct 14 is fixedly connected to the fluidized bed body 1 below the bed plate 13 through bolts, the mesh duct 14 is a multi-layer metal mesh, the mesh duct 14 is distributed along the length direction of the bed plate 13, and the mesh duct 14 is inclined toward the discharge port, so that the material leaked from the bed plate 13 can flow toward the slag outlet below the discharge port. The bottom of the network channel 14 is fixedly connected with a pressure sensor 15 for sensing the amount of the material leaking down the bed board 13.

With reference to fig. 1 to 4, in any structure, the material is blown up and down by controlling the air volume entering the bed plate 13, and in addition, the switching of different position modes is realized by controlling the valves 4 or fans at different positions. The bed plate 13 is divided into a plurality of areas by the plurality of wind scoops 6, and each area comprises more than or equal to three wind scoops 6, so that each area can realize a suspension mode, a micro-boiling mode and a strong boiling mode. And the wind pressure sensors 11 are distributed above each wind scoop 6, so that the running state of each wind scoop 6 can be observed, and meanwhile, the position of the material in the flowing process can be judged to have a problem. Through theoretical estimation, an original single mode of introducing hot air into the materials is changed into a mode of flexibly blowing the materials by adopting three modes, the materials can be uniformly heated under the same air pressure and flow rate, and compared with the air pressure and flow rate required by the existing drying mode, the mode can save heat energy and electric energy; meanwhile, different working modes are switched in the drying process, so that the problem of bed collapse is reduced, the material drying time is shortened, and the drying efficiency is improved.

The utility model discloses still provide the concrete operation flow who realizes three kinds of modes according to above-mentioned structure, including following step:

i, continuously blowing hot air into the air hopper 6, and preheating the bed plate 13 by the hot air. The fluidized bed body 1 is provided with the PLC controller outward, solenoid valve or fan on PLC controller and the 5 pipelines of driving piece pass through electric wire electric connection, the time node of each driving piece 5 of material characteristic control or fan work of PLC controller memory according to the difference and the duration's of during operation procedure, the setting utilizes the built-in procedure of PLC controller to carry out the control of opening and close of normal drying work to driving piece 5 or fan, need not artificial operation, uses manpower sparingly.

And II, the material flows in from a feed inlet on one side of the fluidized bed body 1 and falls on one side of the bed plate 13, the material flows to a discharge outlet along the length direction of the bed plate 13 under the blowing of air, each valve 4 is closed, and at the moment, a small amount of hot air still flows out of the bed plate 13, so that the material has small fluctuation visible to the naked eye, but fluctuation motion of all the material cannot be caused, therefore, the surface of the material is only local fluctuation in a large range through an observation window of the fluidized bed, and the material is in a suspension mode at the moment. When the fan is used, the material can be slightly blown up by starting about 20 percent of the rated power of the fan, and the suspension mode is realized.

The time for switching the working state and the original state of the driving piece 5 and the fan is between 3 and 10 seconds, and the specific time is determined according to the actual condition. Taking 30 valves 4 or fans arranged in a fluidized bed, taking the material to be dried as vitamin C wet particles as an example, sequentially numbering the valves 4 or fans from a feed inlet to a discharge outlet of the fluidized bed by 1-30, starting drying, wherein the odd valves 4 are all opened or the odd fans are started to about 60% of rated power, the even valves 4 are all closed or the even fans are started to about 20% of rated power, the duration time of the odd valves 4 or fans is 3s, then the odd valves 4 are closed or the odd fans are turned down to carry out frequency conversion, the even valves 4 are opened or the even fans are turned up to carry out frequency conversion, the duration time of the even valves 4 or fans is 3s, 6 s form an initial boiling drying period, and the opening and closing actions of all pore plate valves 4 and fans are completed in the period, at the moment, the valve 4 in an opening state and materials right above the fan which is variable-frequency to high power are in a micro-boiling mode; and the valve 4 in the closed state and the material right above the fan with the frequency conversion to the smaller power are in a suspension mode.

When the values of some wind pressure sensors 11 are reduced, the materials are stuck and retained, and then the stage of entering a strong boiling mode is carried out, and the specific rule is as follows: the valves 4 right below the wind pressure sensor 11 are opened two by two, that is, only two adjacent valves 4 are opened each time, if the wind scoops 6 and the corresponding valves 4 are more, the number of the opened valves each time is 1% -30% of the total number, and the rest valves 4 are all closed. Or the starting power of two adjacent fans is up to 100% each time, the power of the rest fans is up to about 20%, the fluctuation height of the materials is obviously higher than that of the materials in the suspension mode and the micro-boiling mode, the materials with the high fluctuation height are in the strong boiling mode, and the materials with the low fluctuation height are in the suspension mode.

After the first two valves 4 or fans finish working, the second two valves 4 or fans start to start or work in a frequency conversion mode, and the opening time lasts for 3-5 s each time; at this moment, the air volume in the air hopper 6 is increased, the air pressure is enhanced, the adhered materials are dispersed, and the numerical value of the air pressure sensor 11 begins to be enlarged. Even the material does not harden and also can regularly open strong boiling mode through the controller and strike, intervene in advance and avoid the material to harden, effectively reduce the later stage and handle the operating time of stepping on the bed specially, improve drying efficiency.

The specific time for opening the valve 4 and the fan is also judged according to the humidity of the material, the steps are repeated when the humidity is high, the closing time of the valve 4 and the fan is prolonged when the humidity is low (the humidity of the material used in the experiment is 13%), the valve 4 is completely closed as long as the numerical value of the wind pressure sensor is within a preset range, the fan is started at low power, and wind can still pass through the bed plate 13 at the moment, so that the material is completely dried in a suspension state, power output is not needed at the moment, energy can be greatly saved, and the cost is saved. And the total opening time of the valve 4 or the fan close to one side of the discharge port of the fluidized bed body 1 is shorter than that of other valves 4 or fans, and because the materials are basically dried completely when flowing to one side of the discharge port, the reduction of the opening time of the valve 4 or the fan close to the discharge port can also play a role in further saving energy, and is beneficial to reducing the energy consumption of the dried materials.

When the mode conversion is performed through the controller, the following requirements are met:

when a is more than 0.01 and less than 0.2, two adjacent valves 4 in the area are opened or two adjacent fans are opened at full power, so that the material is in a strong boiling mode;

when a is more than 0.2 and less than 0.5, the valve 4 in the area is alternatively opened or the fan is alternatively frequency-converted, so that the material is in a micro-boiling mode;

when a is more than 0.5 and less than 0.8, closing a valve 4 in the area or controlling the starting power of a fan to be about 20 percent of the rated power, so that the material is in a suspension mode;

a is only a ratio obtained by an empirical formula, and has no practical significance, wherein the empirical formula is as follows:

wherein:

f is a numerical value measured by the wind pressure sensor and the unit is P;

omega is the specific gravity of material particles, g/cm³；

h is the material laying thickness, and the unit is cm;

k is a constant of 1.3;

v is the wind speed in the wind scoop 6, and the unit is m/s;

gamma is the water content of the material, and the unit is%.

V. in carrying out the drying process, still can switch through the mode control mode of range estimation material, when the material of certain department is completely laminated with bed board 13, can manually open PLC controller and get into operating condition with the valve 4 or the fan of controlling this region, all the other valves 4 or fans are closed, a large amount of hot-air insufflates fluidized drying chamber 12 through wind scoop 6 and bed board 13 in the short time this moment, form the impact to the material of bed board 13 top, can effectually break away the material that glues together, solve the problem that the material hardens, reduce the large granule, improve the qualification rate of material after the drying.

Through the mode, the mode that the valve 4 or the fan enters the working state at intervals is utilized, so that the temperature of each position in the fluidized bed is the same, the problem that the drying of materials is influenced due to the fact that the local temperature is higher and hot air exchanges heat with a region with lower temperature is avoided, the materials can be uniformly heated under the same air pressure and flow rate, and compared with the air pressure and flow rate required by the complete opening of the valve 4 and the fan, the mode can save heat energy and electric energy; simultaneously, different valves 4 and fan working modes are automatically switched in the drying process, so that the problem of bed collapse is reduced, the material drying time is shortened, and the drying efficiency is improved.

As shown in the following table, through the control method of above-mentioned fluidized bed structure combination valve 4 and fan, under the circumstances that feeding volume, material temperature, wind speed and wind volume are the same, no matter from the business turn over material difference (be the material because of the total loss of various reasons), the material of wind channel deposit (the material of bed collapse), inside and the filter sizing (the material of gluing), still from the final moisture content of material and qualified material to see, the utility model discloses a device and mode are all definitely superior to prior art to the difference of each item index is great, explains the utility model discloses have higher superiority. And whatever kind of material, adopt the utility model discloses a device and operation mode, total qualified granule yield all reaches more than 95%. In addition, by adopting the control mode, the amount of fine powder at the cyclone separator/secondary dust removal device arranged outside the fluidized bed is also greatly reduced, which shows that the amount of the material flowing out of the fluidized bed along with air is also greatly reduced, the loss of the material is greatly reduced, and an unexpected excellent technical effect is generated.

To sum up, compare current other equipment, the utility model discloses have high economic value, not only can reduce purchase and manufacturing cost because of simple structure, material loss volume significantly reduces moreover, and qualification rate greatly increased carries out drying work back in batches, can obtain bigger commercial interests for the enterprise in batches, and then can reach the purpose that obtains huge commercial success.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (8)

1. A fluidized bed based on novel control mode is characterized in that: including the fluidized bed body (1), total wind channel (2), dryer (3), valve (4), driving piece (5) and wind fill (6), fluidized bed body (1) middle part is equipped with bed board (13), a plurality of through-hole has been seted up on bed board (13), total wind channel (2) erect in fluidized bed body (1) bottom and from supreme down with dryer (3) in proper order, valve (4) and wind fill (6) communicate with each other, be equipped with the air inlet machine outside total wind channel (2), the fluidized bed body (1) is equipped with the exhaust fan outward, the exhaust fan communicates with each other with fluidized bed upper portion, the wind speed carries out frequency conversion through controller and converter and adjusts in total wind channel (2), driving piece (5) link to each other with valve (4) in order to control the wind-force size through wind fill (6).

2. The fluidized bed based on the novel control mode as claimed in claim 1, wherein: the driving piece (5) is a rotary cylinder or a motor.

3. The fluidized bed based on the novel control mode as claimed in claim 1, wherein: the space between the bed board (13) and the feed inlet is a boiling drying chamber (12), and the upper part of the boiling drying chamber (12) is provided with a plurality of wind pressure sensors (11).

4. The fluidized bed based on the novel control mode as claimed in claim 1, wherein: the output end of the driving piece (5) is fixedly connected with a rotating shaft through a connecting rod, a valve plate is fixedly connected on the rotating shaft, air holes are formed in the valve plate, and the distribution range of the air holes is in direct proportion to the area of a wind hopper (6) connected with the valve (4) covering the bed plate (13).

5. The fluidized bed based on the novel control mode as claimed in claim 4, wherein: the valve plate is disc-shaped or square, and a gap is arranged between the valve plate and the inner wall of the valve (4).

6. The fluidized bed based on the novel control mode as claimed in claim 5, wherein: the shape of the air holes is circular or polygonal, and the distribution form of the air holes is annular, in a row or in a divergence form.

7. The fluidized bed based on the novel control mode as claimed in claim 1, wherein: the axis of the through hole is inclined and the inclined direction is deviated to the discharge hole.

8. The fluidized bed based on the novel control mode as claimed in claim 1, wherein: a mesh channel (14) is fixedly connected to the fluidized bed body (1) below the bed plate (13), the mesh channel (14) is a multi-layer overlapped metal mesh, the mesh channel (14) is distributed along the length direction of the bed plate (13), and the mesh channel (14) is inclined towards the discharge hole.

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