Magnesium sulfate heptahydrate dehydration device

Abstract

The utility model provides a magnesium sulfate heptahydrate dehydration device, which relates to the technical field of magnesium sulfate heptahydrate preparation, and comprises a kiln body, a first heating mechanism and an air exhauster, two ends of the kiln body are respectively provided with a feed port and a discharge port, and a spiral shoveling plate capable of turning and pushing materials is arranged in the kiln body; the first heating mechanism is used for heating the side wall of the kiln body; an air inlet of the air extractor communicates with the tail end of the kiln body, and the air extractor is used for extracting water vapor in the kiln body; the spiral material lifting plate is arranged in the kiln body, materials can be turned over and pushed, the materials can be heated more evenly in the kiln body, and the dehydration quality of the materials can be better guaranteed; and after crystal water in the material is evaporated, water vapor can be pumped out in time by using an air pump, so that the problem of material hardening caused by re-condensation and dissolution of the material by the water vapor can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of magnesium sulfate heptahydrate preparation, in particular to a magnesium sulfate heptahydrate dehydration device. Background Art

[0002] At present, the dehydration of magnesium sulfate heptahydrate mostly adopts a rotary kiln as a dehydration equipment. The kiln body of the rotary kiln is usually tilted and horizontal, and the kiln body is driven to rotate by a transmission device. Utilizing the rotary kiln to carry out the dehydration method is to introduce the magnesium sulfate heptahydrate raw material into the kiln body of the rotary kiln, and then pass a large amount of hot air into the kiln body to dehydrate the magnesium sulfate heptahydrate. However, in the process of heating the magnesium sulfate heptahydrate with the hot air generated by the combustion chamber, the temperature distribution in the kiln body is uneven, the dehydration degree of the magnesium sulfate heptahydrate is different, and the magnesium sulfate heptahydrate can produce a large amount of crystal water in the dehydration process. A large amount of crystal water can dissolve magnesium sulfate and cause the raw material to become compacted, which has a serious impact on the subsequent dehydration efficiency.

[0003] Therefore, it is necessary to develop a new dehydration technology of magnesium sulfate heptahydrate to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a magnesium sulfate heptahydrate dehydration device to solve the problems existing in the prior art. By arranging a spiral shoveling plate inside the kiln body, the material is heated more evenly inside the kiln body, and the dehydration quality of the material can be better guaranteed. Moreover, after the crystal water in the material evaporates, the water vapor can be extracted in time by using an exhaust fan, which can prevent the water vapor from re-condensing and dissolving the material, causing the problem of material compaction.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] A magnesium sulfate heptahydrate dehydration device comprises a kiln body, a first heating mechanism, and an exhaust fan. A feed port and a discharge port are respectively provided at both ends of the kiln body. A spiral shovel capable of turning and pushing materials is provided inside the kiln body. The first heating mechanism is used to heat the side walls of the kiln body. The air inlet of the exhaust fan is connected to the rear end of the kiln body, and the exhaust fan is used to extract water vapor from the kiln body.

[0007] As an embodiment, along the conveying direction of the material in the kiln body, the first heating mechanism includes a front heating section, a middle heating section and a rear heating section which are arranged in sequence.

[0008] As an embodiment, the first heating mechanism includes an electric heating wire, and the electric heating wire is arranged in the side wall of the kiln body or on the outside of the side wall of the kiln body.

[0009] As one embodiment, the kiln body is connected to a rotation driving mechanism for driving the kiln body to rotate.

[0010] As an embodiment, the rotation drive mechanism includes a drive motor, a gear is fixed to the output end of the drive motor, and a gear ring meshing with the gear is fixed to the kiln body.

[0011] As one embodiment, a first finished product storage box is provided at the discharge port of the kiln body.

[0012] As an embodiment, a first valve is provided between the first finished product storage box and the discharge port of the kiln body.

[0013] As one embodiment, the exhaust port of the vacuum pump is connected to a gas-solid separator, the gas outlet of the gas-solid separator is connected to a condensate recovery tank, and the solid outlet of the gas-solid separator is connected to a second finished product storage box.

[0014] As one embodiment, a second valve is provided between the solid outlet of the gas-solid separator and the second finished product storage box.

[0015] As an embodiment, a second heating mechanism is provided on the pipeline between the discharge port of the kiln body and the air inlet of the air pump, and on the pipeline between the exhaust port of the air pump and the gas-solid separator.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] The utility model arranges a spiral material-scraping plate inside the kiln body, which can turn and push the material, so that the material is heated more evenly inside the kiln body, and the dehydration quality of the material is better guaranteed; and after the crystallization water in the material evaporates, the water vapor can be extracted in time by using an exhaust fan, which can prevent the water vapor from condensing again to dissolve the material and causing the problem of material compaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of a magnesium sulfate heptahydrate dehydration device in one embodiment of the present invention;

[0020] Description of reference numerals:

[0021] 1. Kiln body; 2. First heating mechanism; 3. Vacuum pump; 4. Raw material bin; 5. Screw feeder; 6. Discharge valve; 7. Screw shovel; 8. Drive motor; 9. Ring gear; 10. First finished product storage box; 11. First valve; 12. Gas-solid separator; 13. Condensate recovery tank; 14. Second finished product storage box; 15. Second valve; 16. Second heating mechanism; 17. Third heating mechanism. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] The purpose of the utility model is to provide a magnesium sulfate heptahydrate dehydration device to solve the problems existing in the prior art. By arranging a spiral shoveling plate inside the kiln body, the material is heated more evenly inside the kiln body, and the dehydration quality of the material can be better guaranteed. Moreover, after the crystal water in the material evaporates, the water vapor can be extracted in time by using an exhaust fan, which can prevent the water vapor from re-condensing and dissolving the material, causing the problem of material compaction.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown, a magnesium sulfate heptahydrate dehydration device disclosed in this embodiment includes a kiln body 1, a first heating mechanism 2 and an exhaust fan 3. A feed port and a discharge port are respectively provided at both ends of the kiln body 1. The feed port is connected to a raw material bin 4 for storing magnesium sulfate heptahydrate. Figure 1 The graphics at both ends of the middle kiln body 1 represent only the kiln head and tail, and do not represent the increased volume of the cavity. To control the feeding of materials, a screw feeder 5 is installed between the feed port and the raw material bin 4, and a discharge valve 6 is installed between the screw feeder 5 and the raw material bin 4. A spiral shovel 7 is installed inside the kiln body 1 to turn and push the materials. The spiral shovel 7 adopts an auger structure. The angle between the spiral trajectory of the spiral shovel 7 and the central axis of the kiln body 1 can be 15° to 30°, which makes the spiral shovel 7 have a strong turning effect on the materials. The first heating mechanism 2 is used to heat the side walls of the kiln body 1, thereby heating the materials within the kiln body 1. The air inlet of the exhaust fan 3 is connected to the tail end of the kiln body 1, and the exhaust fan 3 is used to extract water vapor from the kiln body 1.

[0026] During the dehydration process, the kiln body 1 rotates. At the same time, the temperature of the kiln body 1 increases under the heating action of the first heating mechanism 2, and the magnesium sulfate heptahydrate material inside the kiln body 1 is heated. The crystal water in the magnesium sulfate heptahydrate is dispersed in the kiln body 1 in the form of water vapor; the exhaust fan 3 exhausts the kiln body 1, and the water vapor in the air in the kiln body 1 is also extracted; the dehydrated magnesium sulfate heptahydrate is finally discharged from the discharge port of the kiln body 1 under the pushing action of the spiral shovel 7.

[0027] Therefore, this embodiment provides a spiral shoveling plate 7 inside the kiln body 1, which can turn and push the material, so that the material is heated more evenly inside the kiln body 1, and the dehydration quality of the material can be better guaranteed; and after the crystallization water in the material evaporates, the water vapor can be extracted in time by the vacuum pump 3, which can prevent the water vapor from re-condensing and dissolving the material, causing the problem of material compaction.

[0028] In this embodiment, after the spiral scooping plate 7 is installed, the material in the kiln body 1 is moved toward the discharge port under the feeding action of the spiral scooping plate 7. Therefore, it is not necessary to tilt the kiln body 1. The kiln body 1 can be set horizontally, which can further avoid the problem of uneven distribution and uneven heating of the material in the kiln body 1. As an example, the spiral scooping plate 7 can be directly fixed to the inner wall of the kiln body 1, or it can be fixed to a rotating shaft that is coaxially arranged inside the kiln body 1 and rotated by a rotating shaft driven by a rotary drive mechanism. To further simplify the structure, the spiral scooping plate 7 in this embodiment is fixed to the inner wall of the kiln body 1. When the kiln body 1 rotates, it can drive the spiral scooping plate 7 to rotate.

[0029] Along the conveying direction of the material in the kiln body 1, the first heating mechanism 2 in this embodiment includes a front heating section, a middle heating section and a rear heating section arranged in sequence. Different products can be obtained by removing different amounts of crystal water of magnesium sulfate heptahydrate. In this embodiment, the front heating section, the middle heating section and the rear heating section can be individually temperature-regulated to control the dehydration speed to obtain the desired material. The temperature adjustment process is usually carried out in the debugging stage after startup. After the temperature adjustment is completed to obtain the desired material, normal production can be carried out. The first heating mechanism 2 includes an electric heating wire, which is arranged on the outside of the side wall of the kiln body 1, or the electric heating wire can be integrated into the side wall of the kiln body 1.

[0030] In this embodiment, the kiln body 1 is connected to a rotation drive mechanism for driving its rotation. The rotation drive mechanism and the kiln body 1 can be driven by a belt, gear, or chain. As a specific example, the rotation drive mechanism in this embodiment includes a drive motor 8, a gear fixed to the output end of the drive motor 8, and a ring gear 9 fixed to the kiln body 1 that meshes with the gear. In this embodiment, two identical ring gears 9 are provided on the kiln body 1 and equipped with two identical drive motors 8. The two ring gears 9 are respectively located near the two ends of the kiln body 1.

[0031] In one embodiment, a first finished product storage bin 10 is provided at the discharge port of the kiln body 1 for collecting dehydrated material. A first valve 11 is provided between the first finished product storage bin 10 and the discharge port of the kiln body 1. Closing the first valve 11 blocks material from falling out of the discharge port, facilitating replacement of the first finished product storage bin 10 or other operations. The first valve 11 can be manually inserted or pulled.

[0032] The vacuum pump 3 may suck out the materials in the turning process during the vacuuming process. In order to avoid material waste, the exhaust port of the vacuum pump 3 in this embodiment is connected to the gas-solid separator 12, and the gas outlet of the gas-solid separator 12 is connected to the condensate recovery box 13, and the solid outlet of the gas-solid separator 12 is connected to the second finished product storage box 14. After the gas-solid separator 12 extracts the water vapor, the water vapor enters the condensate recovery box 13 for condensation, completing the collection of water vapor for other uses, and the material enters the second finished product storage box 14 to be collected. The dehydration effect of the material entering the second finished product storage box 14 may not reach the expected dehydration level, and it can be selected to be dehydrated again or used for other purposes. The gas-solid separator 12 can use a cyclone separator. The structure and principle of the cyclone separator are well known to those skilled in the art. This embodiment does not elaborate on the separation process of the cyclone separator.

[0033] As one embodiment, a second valve 15 is provided between the solids outlet of the gas-solid separator 12 and the second finished product storage box 14. Closing the second valve 15 allows the solids outlet of the gas-solid separator to be discharged, facilitating replacement of the second finished product storage box 14 or other operations. Specifically, the second valve 15 can be a manually inserted pull plate.

[0034] As one embodiment, a second heating mechanism 16 is provided on the pipeline between the discharge port of the kiln body 1 and the air inlet of the air extractor 3, and on the pipeline between the exhaust port of the air extractor 3 and the gas-solid separator 12. The second heating mechanism 16 is used to heat the extracted water vapor that has not yet been separated by the gas-solid separator 12 to prevent the water vapor from condensing and falling back into the material, causing the material to become compacted.

[0035] In one embodiment, a temporary material storage area is provided at the discharge port of the kiln body 1. This area is connected to the first finished product storage bin 10 via a first valve 11. A third heating mechanism 17 is installed on the wall of the temporary material storage area to prevent condensation of water vapor in the temporary material storage area. This third heating mechanism 17 is an electric heating wire. The installation of this third heating mechanism 17 may cause changes in the dehydration of the material. Therefore, during the trial processing stage, the heating temperatures of the first heating mechanism 2 and the third heating mechanism 17 should be adjusted to ensure dehydration quality.

[0036] Adaptive changes based on actual needs are all within the scope of protection of this utility model.

[0037] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A magnesium sulfate heptahydrate dehydration device, characterized in that, include: The kiln body is provided with a feed port and a discharge port at both ends of the kiln body, and a spiral shovel capable of turning and pushing the material is provided inside the kiln body; a first heating mechanism, the first heating mechanism being used to heat the side wall of the kiln body; and an air pump, wherein the air inlet of the air pump is connected to the rear end of the kiln body, and the air pump is used to extract water vapor in the kiln body.

2. The magnesium sulfate heptahydrate dehydration device according to claim 1, wherein Along the conveying direction of the material in the kiln body, the first heating mechanism includes a front heating section, a middle heating section and a rear heating section which are arranged in sequence.

3. The magnesium sulfate heptahydrate dehydration device according to claim 1 or 2, wherein The first heating mechanism includes an electric heating wire, and the electric heating wire is arranged in the side wall of the kiln body or outside the side wall of the kiln body.

4. The magnesium sulfate heptahydrate dehydration device according to claim 1, wherein The kiln body is connected to a rotation driving mechanism for driving the kiln body to rotate.

5. The magnesium sulfate heptahydrate dehydration device according to claim 4, wherein The rotation driving mechanism includes a driving motor, a gear is fixed to the output end of the driving motor, and a gear ring meshing with the gear is fixed to the kiln body.

6. The magnesium sulfate heptahydrate dehydration device according to claim 1, wherein A first finished product storage box is provided at the discharge port of the kiln body.

7. The magnesium sulfate heptahydrate dehydration device according to claim 6, wherein A first valve is provided between the first finished product storage box and the discharge port of the kiln body.

8. The magnesium sulfate heptahydrate dehydration device according to claim 1, wherein The exhaust port of the vacuum pump is connected to a gas-solid separator, the gas outlet of the gas-solid separator is connected to a condensate recovery tank, and the solid outlet of the gas-solid separator is connected to a second finished product storage box.

9. The magnesium sulfate heptahydrate dehydration device according to claim 8, characterized in that A second valve is provided between the solid outlet of the gas-solid separator and the second finished product storage box.

10. The magnesium sulfate heptahydrate dehydration device according to claim 8, characterized in that: A second heating mechanism is provided on the pipeline between the discharge port of the kiln body and the air inlet of the air pump, and on the pipeline between the exhaust port of the air pump and the gas-solid separator.

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