CN113267033A

CN113267033A - Drying device is used in magnesium sulfate production

Info

Publication number: CN113267033A
Application number: CN202110520901.3A
Authority: CN
Inventors: 朱小建
Original assignee: Lianyungang Longtaiwei Food Ingredients Co ltd
Current assignee: Lianyungang Longtaiwei Food Ingredients Co ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2021-08-17

Abstract

The invention discloses a drying device for magnesium sulfate production, which belongs to the technical field of drying equipment and comprises a base and a drying device, wherein the drying device respectively comprises a shell, a stirring device, a scraper device, an air injection device and an electric control box, the upper part of the shell is provided with a feed port and an exhaust port, the lower part of the shell is provided with a discharge port, the feed port and the exhaust port are communicated with the shell, the feed port is used for feeding, the exhaust port is used for discharging heat-exchanged gas, at least one inverted cone-shaped heat exchange plate and a heating device are arranged in the shell from top to bottom, the heating device is fixed on the inner wall of the shell, the inverted cone-shaped heat exchange plate is fixedly connected with the interior of the shell, the shell is connected with a, when more than two inverted cone-shaped heat exchange plates are provided, the diameter of the through-hole on the lower heat exchange plate is smaller than the diameter of the through-hole on the upper heat exchange plate. The technical problems of poor drying effect, low heat exchange rate and high production cost of the existing equipment are solved, and the equipment is mainly applied to the aspect of drying magnesium sulfate production.

Description

Drying device is used in magnesium sulfate production

Technical Field

The invention belongs to the technical field of magnesium sulfate drying equipment, and particularly relates to a drying device for magnesium sulfate production.

Background

Generally, magnesium sulfate is an inorganic chemical product, has wide application, and can be applied to the fields of fertilizers, feeds, medicines, foods, leather making, paper making and the like. Common magnesium sulfate mainly comprises magnesium sulfate heptahydrate, magnesium sulfate monohydrate and anhydrous magnesium sulfate, the magnesium sulfate heptahydrate has the defects of lower sulfur-containing magnesium component, long-term storage and easy caking of products, high mixing difficulty with other materials, low selling price, limited market and the like compared with the magnesium sulfate monohydrate and the anhydrous magnesium sulfate, and the additional value of the magnesium sulfate product can be further increased by drying/calcining the magnesium sulfate heptahydrate to prepare the magnesium sulfate monohydrate and the anhydrous magnesium sulfate. Therefore, how to prepare the magnesium sulfate monohydrate and the anhydrous magnesium sulfate with high added values by utilizing the existing magnesium sulfate heptahydrate has important significance. The existing processes for preparing magnesium sulfate monohydrate and anhydrous magnesium sulfate by drying/calcining magnesium sulfate heptahydrate are mainly divided into a rotary drum drying method, a single-stage rotary flash drying method and a fluidized bed drying method, wherein the fluidized bed drying method has high requirements on the water content and the fluidity of materials, so that the phenomenon of 'press bed' caused by material agglomeration is easy to occur, and the dehydration efficiency in the fluidization process is influenced.

Patent application No.: 202010226855.1 discloses a petrochemical environmental protection drying equipment, belong to drying equipment technical field, including drive arrangement and drying device, drying device installs on the supporting leg, drying device includes a jar body, top cap and discharge gate, drive arrangement is connected with the major axis, the major axis passes in the middle of the top cap, be equipped with inlet pipe and outlet duct on the top cap, weld at the bottom of the last pot at the jar body, weld at the bottom of the lower pot at the jar internally, be equipped with the toper end in the middle of the bottom of the last pot and the bottom of the lower pot, go up the bottom of the pot and the bottom of the lower pot structure is the same, it installs scraper I and last scraper II respectively to go up bottom of the pot and bottom of the lower pot inside surface, the lower part of the jar body is equipped with whirlwind generating device, whirlwind drive arrangement installs between jar body, vice drive whirlwind generating device is rotatory, the toper end is in the same place through brace rod and jar body welding, still be equipped with the intake pipe on the jar body. The problems of high production cost, low drying efficiency and the like in the prior art are solved, and the drying device is mainly applied to the fields of petrochemical industry and the like for drying, but the defects of the patent are as follows: the heat exchange rate is low, so that more input energy is generated, and the upward hot air is blown again to drive the blades to rotate by the motor, so that the production cost is increased; when hot air is blown upwards, the middle wind power is large, the two sides wind power is small, and uniform heat exchange cannot be guaranteed, so that the heat exchange rate is improved.

Disclosure of Invention

The invention aims to provide a drying device for magnesium sulfate production, which aims to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a drying device is used in magnesium sulfate production, includes base and drying device, the base include bottom plate and baffle, fixed connection between baffle and the bottom plate, the base is used for supporting whole device, installs drying device between two baffles, drying device is the core part of whole patent.

The drying device comprises a shell, a stirring device, a scraper device, an air injection device and an electric control box respectively, wherein a feeding hole and an exhaust hole are formed in the upper portion of the shell, a discharge hole is formed in the lower portion of the shell, the feeding hole and the exhaust hole are communicated with the shell, the feeding hole is used for feeding, the exhaust hole is used for exhausting gas subjected to heat exchange, the exhaust hole can be connected with a gas filtering device, the energy of the filtered gas is recycled again, and the reduction of energy loss is facilitated. The casing is inside from last to being equipped with an inverted cone shape heat exchange plate and heating device down at least, heating device is fixed in the inner wall of casing, inverted cone shape heat exchange plate and the inside fixed connection of casing, the casing is connected with the bottom plate through strutting arrangement, the equal proportion on the inverted cone shape heat exchange plate has evenly seted up the through-hole, when being equipped with two or more inverted cone shape heat exchange plates, the diameter of the through-hole on the heat exchange plate of lower part is less than the diameter of through-hole on the heat exchange plate of upper portion.

Agitating unit is the core component of this patent, and agitating unit includes agitator motor, rotation axis and agitator, is equipped with one row of stirring board on the agitator, agitator and rotation axis fixed connection, and agitator motor passes through motor support fixed mounting in the intermediate position on casing upper portion, agitator motor's output shaft and rotation axis fixed connection, the rotation axis run through the central point of the heat exchange board of the shape of falling cone put, the rotation axis is put through the bearing with the central point of the heat exchange board of the shape of falling cone and is connected, the agitator be located the heat exchange board of the shape of falling cone.

The air injection device comprises a blade and a hot air pipeline, the lower part of the rotating shaft is fixedly connected with the middle position of the blade, an air inlet pipe is arranged in the blade, an exhaust outlet is arranged at the upper part of the air inlet pipe, the air inlet pipe is communicated with an air inlet, the lower part of the air inlet is connected with the hot air pipeline through a bearing, a sealing ring is further arranged at the lower part of the bearing, the hot air pipeline is connected with a hot air inlet, and the hot air inlet is communicated with the lower part of the shell.

Preferably: in order to improve heat exchange rate and drying effect, the lower part of intake pipe be equipped with a row of gas delivery outlet I, gas delivery outlet I and gas delivery outlet be upper and lower symmetrical structure, the gas delivery outlet is linked together with the intake pipe, so the design can let hot-blast formation convection current in the casing to improve the drying effect of heat exchange rate and material, heat exchange rate is best when gas delivery outlet I is located the lower part intermediate position of every two gas delivery outlets, the effect is best.

Preferably: in order to prevent the material from being stained with on the inverted cone heat exchange plate, the inverted cone heat exchange plate on be equipped with and scrape the flitch, scrape flitch and rotation axis fixed connection, scrape the flitch and follow the rotation of rotation axis and scrape the material on the inverted cone heat exchange plate, be favorable to improving the heat exchange rate.

Preferably: in order to prevent that the material from being stained with on the casing, still be equipped with scraper means on the rotation axis, scraper means include the elastic rod, the elastic rod is connected with the scraper blade, the scraper blade laminating on the inner wall of casing, wherein elastic rod and rotation axis fixed connection.

Preferably: the supporting device comprises a fixed plate and an elastic mechanism, the fixed plate is connected with the shell, the upper part of the elastic mechanism is connected with the lower part of the fixed plate, the lower part of the elastic mechanism is connected with the bottom plate, and the elastic mechanism can be a spring or other elastic devices.

Preferably: the casing in still be equipped with temperature sensor, temperature sensor's quantity more than or equal to 1, temperature sensor is connected with the PLC board through the circuit, the PLC board is connected with the controller.

Preferably: the casing in still be equipped with on the filter, the filter on set up the through-hole of equal proportion range, the through-hole is used for the passing through of material, the filter is used for assisting the final drying of material, the effect preferred when the filter locates the below of blade, the filter reduces the falling speed of material on the one hand, on the other hand makes the material dried once more through air jet system to improve the drying rate of material, make the material after the drying reach 99% and accord with the production needs.

Preferably: the casing on still be equipped with the electromagnetic shaker, the electromagnetic shaker is used for assisting the drying of whole equipment, when the electromagnetic shaker cooperation strutting arrangement uses together, the effect is better, especially when strutting arrangement is elastic mechanism, the effect is best, because itself along with the rotation of machine, just can produce the vibrational force, the elastic mechanism of lower part is given in the vibration power transmission, thereby make whole equipment produce the shock excitation, so not only can make the material more fast more evenly the unloading, can also make the material obtain abundant upset, make carry out more abundant heat exchange between material and the hot-blast, reach the effect that improves the heat exchange rate.

Compared with the prior art, the invention has the beneficial effects that:

the drying device has good dehydration effect on the magnesium sulfate heptahydrate, the hot air blown upwards by the air injection device has cyclone effect, the heat exchange between the materials and the hot air is more facilitated, the overall heat exchange rate is improved by more than 30 percent, the energy consumption is reduced by more than 30 percent, the energy source is very nervous in modern society, the design is in line with the requirement of industrial development, and the design of the drying device does not need an additional motor to increase the wind power, so the production cost is reduced by more than 10 percent, the scraping plate device can reduce the materials attached to the inner wall of the shell, the cleaning difficulty is reduced, the whole equipment is designed compactly, the occupied space is saved by more than 30 percent, the material drying speed is improved by more than 15 percent due to the addition of the air injection device, and the drying device has a double-layer heat exchange plate structure, the invention thoroughly solves the technical problem of caking in the falling process of the material, thereby having the advantages of low cost, caking prevention, small occupied space, high drying efficiency and low energy consumption, and being suitable for comprehensive popularization and application.

Drawings

FIG. 1 is an internal structure view of a drying apparatus for magnesium sulfate production according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

FIG. 4 is a material feeding and air heat exchange process of a drying device for magnesium sulfate production according to the present invention;

FIG. 5 is a front view of a drying apparatus for magnesium sulfate production according to the present invention;

FIG. 6 is a top view of a drying apparatus for magnesium sulfate production in accordance with the present invention;

FIG. 7 is a structural view of an inverted conical heat exchange plate of a drying apparatus for magnesium sulfate production according to the present invention;

FIG. 8 is a structural diagram of a scraper plate of the drying device for magnesium sulfate production;

FIG. 9 is a top view of a blade portion of a drying apparatus for magnesium sulfate production in accordance with the present invention;

FIG. 10 is a view showing the internal structure of a blade part of a drying apparatus for magnesium sulfate production according to the present invention;

FIG. 11 is a view showing the structure II of the inner part of the blade part of the drying apparatus for magnesium sulfate production according to the present invention.

In the figure: 1 electric control box, 1-1 heat dissipation hole, 1-2 controller, 1-3 alarm device, 2 baffle, 3 bottom plate, 4 stirring motor, 4-1 motor support, 5 shell, 5-1 feed inlet, 5-2 exhaust hole, 5-3 discharge hole, 5-4 filter plate, 5-5 inverted cone heat exchange plate, 5-5-1 through hole, 5-5-2 scraping plate, 5-6 stirrer, 5-6-1 stirring plate, 5-7 rotating shaft, 6 hot air inlet, 6-1 hot air pipeline, 7 fixing plate, 7-1 elastic mechanism, 8 temperature sensor, 9 elastic rod, 9-1 scraping plate, 10 blade, 10-1 gas outlet, 10-2 gas inlet pipe, 10-3 gas inlet, 10-4 gas outlet I, 10-5 sealing rings, 10-6 bearings, 11 vibrators and 12 manholes.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1-11:

a drying device for magnesium sulfate production comprises a base and a drying device, wherein the base comprises a bottom plate 3 and baffle plates 2, the baffle plates 2 are fixedly connected with the bottom plate 3, the drying device is arranged between the two baffle plates 2 and comprises a shell 5, a stirring device, a scraper plate device, an air injection device and an electric control box 1, a PLC (programmable logic controller) plate is arranged in the electric control box 1 and is connected with a controller 1-2, the PLC plate is respectively connected with each electronic component in the device through a circuit, a feed hole 5-1 and an exhaust hole 5-2 are arranged at the upper part of the shell 5, a discharge hole 5-3 is arranged at the lower part of the shell 5, the feed hole 5-1 and the exhaust hole 5-2 are communicated with the shell 5, an inverted conical heat exchange plate 5-5 and a heating device 5-8 are arranged in the shell 5, and the heating device 5-8 is fixed on the inner wall of the shell 5, the inverted cone-shaped heat exchange plate 5-5 is fixedly connected with the inside of a shell 5, the shell 5 is connected with a bottom plate 3 through a supporting device, through holes 5-5-1 are uniformly formed in the inverted cone-shaped heat exchange plate 5-5 in an equal proportion, the stirring device comprises a stirring motor 4, a rotating shaft 5-7 and a stirrer 5-6, the stirrer 5-6 is fixedly connected with the rotating shaft 5-7, a row of stirring plates 5-6-1 is further arranged on the stirrer 5-6, the stirring motor 4 is fixedly arranged at the middle position of the upper part of the shell 5 through a motor support 4-1, an output shaft of the stirring motor 4 is fixedly connected with the rotating shaft 5-7, the rotating shaft 5-7 penetrates through the central position of the inverted cone-shaped heat exchange plate 5-5, and the rotating shaft 5-7 is connected with the central position of the inverted cone-shaped heat exchange plate 5-5 through a bearing, the stirrer 5-6 is positioned in the inverted cone-shaped heat exchange plate 5-5, the air injection device comprises a blade 10 and a hot air pipeline 6-1, the lower part of a rotating shaft 5-7 is fixedly connected with the middle position of the blade 10, the shell 5 is also internally provided with a temperature sensor 8, the number of the temperature sensors 8 is 1, the blade 10 is internally provided with an air inlet pipe 10-2, the upper part of the air inlet pipe 10-2 is provided with an exhaust outlet 20-1, the air inlet pipe 10-2 is communicated with an air inlet 10-3, the lower part of the air inlet 10-3 is connected with the hot air pipeline 6-1 through a bearing 10-6, the lower part of the bearing 10-6 is also provided with a sealing ring 10-5, the hot air pipeline 6-1 is connected with the hot air inlet 6, and the hot air inlet 6 is communicated with the lower part of the shell 5, the PLC board is respectively connected with the heating devices 5-8, the stirring motor 4 and the temperature sensor 8 through lines, and people can regulate and control the temperature and control the rotation of the stirring motor 4 in the controller 1-2.

The working principle of the invention is as follows: firstly, preheating the equipment, controlling a heating device 5-8 and blowing hot air by a controller to keep the temperature in a shell 5 at about 250 ℃, conveying magnesium sulfate heptahydrate from a feed inlet 5-1 to the shell 5 by a conveying device, contacting the magnesium sulfate heptahydrate with an inverted cone-shaped heat exchange plate 5 in the first step to carry out primary heat exchange dehydration, leaking the magnesium sulfate heptahydrate from through holes on the inverted cone-shaped heat exchange plate 5 under the combined action of a stirrer 5-6 and a 5-5-2 scraper plate, carrying out dehydration and heat exchange again when encountering upward hot air flow in the process of downward leakage of the magnesium sulfate heptahydrate, generating the upward hot air flow by a 10-1 gas output port of a gas spraying device, generating the upward air flow due to the rotation of the whole blade 10 along with the rotation shaft 5-7, and rotating the whole gas output port 10-1 along with the rotation shaft 5-7, therefore, the gas outlet 10-1 generates hot cyclone under the action of upward airflow, magnesium sulfate heptahydrate reduces the falling speed under the action of the hot cyclone on the one hand, heat exchange between the hot cyclone and the magnesium sulfate heptahydrate is accelerated on the other hand, the rapid dehydration process is achieved, the dehydrated magnesium sulfate is discharged from the discharge port 5-3, in order to achieve the effect of energy recovery, the energy recovery processing system is connected to the exhaust port 5-2, and hot air generated after water vapor with heat energy is filtered and absorbed by the energy recovery system enters the hot air inlet 6 again to form circulation.

Example 2

As shown in fig. 1-11:

a drying device for magnesium sulfate production comprises a base and a drying device, wherein the base comprises a bottom plate 3 and baffle plates 2, the baffle plates 2 are fixedly connected with the bottom plate 3, the drying device is arranged between the two baffle plates 2 and comprises a shell 5, a stirring device, a scraper plate device, an air injection device and an electric control box 1, a PLC (programmable logic controller) plate is arranged in the electric control box 1 and is connected with a controller 1-2, the PLC plate is respectively connected with each electronic component in the device through a circuit, a feed hole 5-1 and an exhaust hole 5-2 are arranged at the upper part of the shell 5, a discharge hole 5-3 is arranged at the lower part of the shell 5, the feed hole 5-1 and the exhaust hole 5-2 are communicated with the shell 5, two inverted cone-shaped heat exchange plates 5-5 and a heating device 5-8 are arranged in the shell 5 from top to bottom, the heating device 5-8 is fixed on the inner wall of the shell 5, the inverted cone-shaped heat exchange plate 5-5 is fixedly connected with the interior of the shell 5, the shell 5 is connected with the bottom plate 3 through the supporting device, the inverted cone-shaped heat exchange plate 5-5 is uniformly provided with through holes 5-5-1 in equal proportion, the through hole on the inverted cone-shaped heat exchange plate 5-5 on the middle upper part of the shell is larger than the through hole on the inverted cone-shaped heat exchange plate 5-5 on the lower part, the stirring device comprises a stirring motor 4, a rotating shaft 5-7 and a stirrer 5-6, the stirrer 5-6 is fixedly connected with the rotating shaft 5-7, the stirrer 5-6 is also provided with a row of stirring plates 5-6-1, the stirring motor 4 is fixedly arranged at the middle position of the upper part of the shell 5 through a motor bracket 4-1, and the output shaft of the stirring motor 4 is fixedly connected with the rotating shaft 5-7, the rotating shaft 5-7 penetrates through the center of the inverted-cone-shaped heat exchange plate 5-5, the rotating shaft 5-7 is connected with the center of the inverted-cone-shaped heat exchange plate 5-5 through a bearing, the stirrer 5-6 is positioned in the inverted-cone-shaped heat exchange plate 5-5, the air injection device comprises a blade 10 and a hot air pipeline 6-1, the lower part of the rotating shaft 5-7 is fixedly connected with the middle of the blade 10, an air inlet pipe 10-2 is arranged inside the blade 10, an air outlet 20-1 is arranged at the upper part of the air inlet pipe 10-2, the air inlet pipe 10-2 is communicated with an air inlet 10-3, the lower part of the air inlet 10-3 is connected with the hot air pipeline 6-1 through the bearing 10-6, and a sealing ring 10-5 is further arranged at the lower part of the bearing 10-6, the hot air pipeline 6-1 is connected with a hot air inlet 6, the hot air inlet 6 is communicated with the lower part of the shell 5, the supporting device comprises a fixed plate 7 and an elastic mechanism 7-1, the fixed plate is connected with the shell 5, the upper part of the elastic mechanism 7-1 is connected with the lower part of the fixed plate 7, the lower part of the elastic mechanism 7-1 is connected with the bottom plate 3, the shell 5 is also internally provided with 2 temperature sensors 8, the shell 5 is also provided with a vibrator 11, the lower part of the air inlet pipe 10-2 is provided with a row of air outlet I10-4, the air outlet hole 10-1 is communicated with the air inlet pipe 10-2, and the heat exchange effect generated when the air outlet I10-4 is positioned in the middle of the lower part of every two air outlets 10-1 is optimal. The gas output hole 10-1 is communicated with the gas inlet pipe 10-2, a filter plate 5-4 is further arranged in the shell 5, through holes which are arranged in equal proportion are formed in the filter plate 5-4, the filter plate 5-4 is arranged below the blade 10, the PLC board is respectively connected with the heating device 5-8, the stirring motor 4, the temperature sensor 8 and the vibrator 11 through lines, and people can regulate and control the temperature, control the rotation of the stirring motor 4 and control the start and stop of the vibrator 11 in the controller 1-2.

The working principle of the invention is as follows: firstly, preheating equipment, controlling a heating device 5-8 and blowing hot air through a controller to keep the temperature in a shell 5 at about 260 ℃, conveying magnesium sulfate heptahydrate from a feed inlet 5-1 to the shell 5 through a conveying device, contacting the magnesium sulfate heptahydrate with an inverted cone-shaped heat exchange plate 5 in the first step to carry out primary heat exchange and dehydration, leaking the magnesium sulfate heptahydrate from through holes on the inverted cone-shaped heat exchange plate 5 under the combined action of a stirrer 5-6 and a scraper 5-5-2, when the magnesium sulfate heptahydrate leaks to meet the next inverted cone-shaped heat exchange plate, because the through holes of the next inverted cone-shaped heat exchange plate are smaller, the material flows downwards step by step to prevent caking, the whole process is gradual, when the magnesium sulfate heptahydrate falls down from the inverted cone-shaped heat exchange plate again, the dehydration and the heat exchange are carried out again when meeting the upward hot air flow, the upward hot air flow is generated by a 10-1 gas output port of the air injection device, the whole blade 10 rotates along with the rotating shaft 5-7 to generate upward air flow, the whole gas output port 10-1 also rotates along with the rotating shaft 5-7, so that the gas output port 10-1 generates hot cyclone under the action of the upward air flow, and magnesium sulfate heptahydrate reduces the falling speed on the one hand and accelerates the heat exchange between the hot cyclone and the magnesium sulfate heptahydrate on the other hand to achieve the rapid dehydration process.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a drying device is used in magnesium sulfate production, includes base and drying device, the base include bottom plate (3) and baffle (2), fixed connection between baffle (2) and bottom plate (3), install drying device, its characterized in that between two baffle (2): the drying device comprises a shell (5), a stirring device, a scraper device, an air injection device and an electric control box (1), wherein a feeding hole (5-1) and an exhaust hole (5-2) are formed in the upper portion of the shell (5), a discharge hole (5-3) is formed in the lower portion of the shell (5), the feeding hole (5-1) and the exhaust hole (5-2) are communicated with the shell (5), at least one inverted cone-shaped heat exchange plate (5-5) and a heating device (5-8) are arranged in the shell (5) from top to bottom, the heating device (5-8) is fixed on the inner wall of the shell (5), the inverted cone-shaped heat exchange plate (5-5) is fixedly connected with the inside of the shell (5), the shell (5) is connected with a bottom plate (3) through a supporting device, uniform through holes (5-5-1) are formed in the inverted cone-shaped heat exchange plate (5-5) in an equal proportion, the stirring device comprises a stirring motor (4), a rotating shaft (5-7) and a stirrer (5-6), wherein the stirrer (5-6) is fixedly connected with the rotating shaft (5-7), the stirrer (5-6) is also provided with a row of stirring plates (5-6-1), the stirring motor (4) is fixedly arranged at the middle position of the upper part of the shell (5) through a motor support (4-1), an output shaft of the stirring motor (4) is fixedly connected with the rotating shaft (5-7), the rotating shaft (5-7) penetrates through the central position of the inverted cone-shaped heat exchange plate (5-5), the rotating shaft (5-7) is connected with the central position of the inverted cone-shaped heat exchange plate (5-5) through a bearing, and the stirrer (5-6) is positioned in the inverted cone-shaped heat exchange plate (5-5), the air injection device comprises a blade (10) and a hot air pipeline (6-1), the lower part of the rotating shaft (5-7) is fixedly connected with the middle position of the blade (10), an air inlet pipe (10-2) is arranged inside the blade (10), an exhaust outlet (10-1) is arranged at the upper part of the air inlet pipe (10-2), the air inlet pipe (10-2) is communicated with the air inlet (10-3), the lower part of the air inlet (10-3) is connected with the hot air pipeline (6-1) through a bearing (10-6), a sealing ring (10-5) is also arranged at the lower part of the bearing (10-6), the hot air pipeline (6-1) is connected with a hot air inlet (6), and the hot air inlet (6) is communicated with the lower part of the shell (5).

2. The drying device for magnesium sulfate production according to claim 1, wherein a row of gas outlets I (10-4) are arranged at the lower part of the gas inlet pipe (10-2), the gas outlets I (10-4) and the gas outlets (10-1) are in a vertically symmetrical structure, and the gas outlets (10-1) are communicated with the gas inlet pipe (10-2).

3. The drying device for magnesium sulfate production as set forth in claim 1, wherein a row of gas outlets I (10-4) are provided at the lower part of the gas inlet pipe (10-2), the gas outlets I (10-4) are located at the middle position of the lower part of each two gas outlets (10-1), and the gas outlets (10-1) are communicated with the gas inlet pipe (10-2).

4. The drying device for magnesium sulfate production as set forth in claim 1, wherein the inverted conical heat exchange plate (5-5) is provided with a scraper plate (5-5-2), the scraper plate (5-5-2) is fixedly connected with the rotating shaft (5-7), and the scraper plate (5-5-2) rotates along with the rotating shaft (5-7).

5. The drying device for magnesium sulfate production as claimed in claim 1, wherein a scraper device is further arranged on the rotating shaft (5-7), the scraper device comprises an elastic rod (9), the elastic rod (9) is connected with the scraper (9-1), the scraper (9-1) is attached to the inner wall of the shell (5), and the elastic rod (9) is fixedly connected with the rotating shaft (5-7).

6. The drying device for magnesium sulfate production as claimed in claim 1, wherein the supporting device comprises a fixing plate (7) and an elastic mechanism (7-1), the fixing plate is connected with the shell (5), the upper part of the elastic mechanism (7-1) is connected with the lower part of the fixing plate (7), and the lower part of the elastic mechanism (7-1) is connected with the bottom plate (3).

7. The drying device for magnesium sulfate production as claimed in claim 1, characterized in that a temperature sensor (8) is further arranged in the housing (5), and the number of the temperature sensors (8) is more than or equal to 1.

8. The drying device for magnesium sulfate production as set forth in claim 1, wherein the casing (5) is further provided with a filter plate (5-4), and the filter plate (5-4) is provided with through holes arranged in equal proportion.

9. The drying apparatus for magnesium sulfate production as set forth in claim 8, wherein the filter plate (5-4) is provided below the blade (10).

10. The drying device for magnesium sulfate production as claimed in claim 9, wherein the housing (5) is further provided with a vibrator (11) and a manhole (12), and the electrical control box (1) is provided with a row of heat dissipation holes (1-1) and an alarm device (1-3).