Hollow blade drying device

Abstract

The utility model provides an efficient hollow blade drying device for drying materials. The hollow shaft is arranged in the shell, the hollow blades are arranged on the hollow shaft and communicated with the hollow shaft, an in-shaft steam inlet is formed in one end of the hollow shaft, and an in-shaft steam outlet is formed in the other end of the hollow shaft. The hot air outlet is connected with a vacuumizing device, and the hot air inlet is connected with an air feeder. A new thought of supplementing hot air and jointly using positive pressure and negative pressure is formed, hot air is introduced into the hot air inlet, and the air feeder is additionally arranged in front of the hot air inlet, so that various defects caused by pure negative pressure dehumidification are overcome; and through the two modes of heating in the hollow shaft and introducing hot air into the shell, the material drying efficiency is improved, the moisture removal effect is good, and the drying effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of material drying, in particular to a hollow blade drying device. Background Art

[0002] Hollow paddle dryer is a horizontal stirring type continuous drying equipment mainly based on heat conduction. Because the stirring blades are shaped like paddles, it is called paddle dryer. It is also called trough dryer or stirring dryer abroad.

[0003] Because the heat required for drying by this equipment is indirectly heated by heat conduction, the drying process does not require or only requires a small amount of gas to take away the moisture. This greatly reduces the heat loss carried away by the airflow, improves the heat utilization rate, and is an energy-saving drying equipment. Paddle dryers are widely used in the drying of powdered, granular, filter cake, and slurry materials in the petrochemical, chemical, metallurgical, food, pharmaceutical, pesticide and other industries.

[0004] The patent document with the publication number CN218238193U discloses a hollow blade dryer with high drying efficiency. The top of the hollow blade dryer body is provided with a feeding port and an exhaust port, and the exhaust port is located on the right side of the feeding port. The top of the hollow blade dryer body is provided with a feeding pipe at the feeding port. The setting of the heating pipe facilitates the temperature of the outer wall of the hollow blade dryer body, thereby facilitating the further improvement of the drying efficiency of the material. Compared with the traditional blade dryer which can only be heated by the single heating method of the hollow blade shaft, the present structure has multiple heating methods, which improves the drying effect of the material. The patent lays a heating pipe on the outer wall of the body, and the heat medium enters the heating pipe, thereby increasing the temperature of the outer wall of the dryer body, thereby improving the drying efficiency of the material. However, the structure needs to lay a heating pipe, which is complex in structure and high in cost. Moreover, the heating pipe realizes heating from the outside to the inside, and the heat transfer efficiency is low. In addition, most of the existing paddle drying equipment uses negative pressure dehumidification. During the use of pure negative pressure dehumidification, the entire sealing requirements of the equipment are very high, which is obviously contrary to the setting of the feeding port, air inlet and maintenance port of the paddle drying. In actual use, it will bring a large loss of air volume, thereby weakening the dehumidification effect, and causing material accumulation in the dehumidification pipe, etc., and even condensation water and color spots will drip on the top wall and air outlet of the equipment due to the reduction of the dehumidification effect. Utility Model Content

[0005] The utility model provides a highly efficient hollow blade drying device to solve the problems of complex heat transfer structure, low heat transfer efficiency, poor dehumidification effect, etc. of the existing hollow blade drying device.

[0006] The technical solution of the utility model is:

[0007] The hollow blade drying device comprises an outer shell 5, a hollow shaft 2 arranged in the outer shell 5, and a plurality of groups of hollow blades 3 arranged on the hollow shaft 2 and connected to the hollow shaft 2, an inner shaft steam inlet 12 is arranged at one end of the hollow shaft 2, and an inner shaft steam outlet 11 is arranged at the other end of the hollow shaft 2. The device is characterized in that at least one hot air inlet 4 and a hot air outlet 10 are arranged on the side wall of the outer shell, the hot air outlet 10 is connected to the vacuum device, and the hot air inlet 4 is connected to the blower.

[0008] Preferably, each group of hollow blades includes two hollow fan-shaped blades, which are not connected to each other. The fan-shaped blades are welded by two fan-shaped panels 31, an arc-shaped side panel 32, and one or two side panels 33. Along the spiral direction, the spacing between the two fan-shaped panels becomes wider and wider.

[0009] Preferably, the point where the distance between the two fan-shaped panels is the largest is used as the end point of each group of hollow blades 3, and from the feeding end to the discharging end of the hollow shaft 2, the angle of the end position of the hollow blades 3 differs by 90°.

[0010] Preferably, a scraper 13 is detachably connected to the end point of each group of hollow blades 3 to scrape up the materials deposited on the bottom of the shell to prevent dead corners.

[0011] Preferably, the hot air outlet 10 is arranged near the discharge port 8, and the hot air inlet 4 is arranged near the feed port 6. Such a design can make the hot air flow direction in the shell 5 opposite to the material discharge direction, so that the hot air is in full contact with the material.

[0012] Preferably, a heightened cover plate is provided on the top of the housing 5, and the hot air outlet 10 is provided on the heightened cover plate.

[0013] Preferably, an air filter device is provided at the hot air inlet 4 .

[0014] Preferably, there are two or four hollow shafts 2 , and each hollow shaft 2 is provided with a hollow blade 3 .

[0015] Preferably, a drain port 7 is provided at the bottom of the housing 5 .

[0016] Preferably, the hot air outlet 10 is connected to a dust removal device.

[0017] The advantages of the utility model are:

[0018] 1. The utility model forms a new idea of ​​using supplementary hot air and positive and negative pressure together. The hot air inlet has 4 hot air passages, and a blower is installed in front of the hot air inlet, etc., which overcomes the various defects brought about by simple negative pressure dehumidification.

[0019] The utility model improves the drying efficiency of materials by heating the hollow shaft and passing hot air through the outer shell, and has high thermal efficiency, strong dehumidification effect and good drying effect.

[0020] The equipment has a compact structure, a large heat transfer area per unit volume, and occupies a small area.

[0021] 4. The height of the shell is increased to reduce the amount of dry powder brought out by the hot air outlet and reduce material loss.

[0022] 5. When two hollow shafts with hollow blades are selected, the mixing is uniform, and the hollow blades can mesh with each other, which has a self-cleaning effect and can prevent the material from sticking to the wall.

[0023] 6. Low energy consumption and low operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 A schematic diagram of the structure of a hollow blade;

[0026] Figure 3 This is a schematic diagram of the structure of one of the fan-shaped blades.

[0027] Among them: 1. driving device; 2. hollow shaft; 3. hollow blade; 31. fan-shaped panel; 32. arc-shaped side panel; 33. side panel; 4. hot air inlet; 5. outer shell; 6. feed port; 7. drain port; 8. discharge port; 9. observation port; 10. hot air outlet; 11. steam outlet in the shaft; 12. steam inlet in the shaft; 13. scraper. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, the hollow blade drying device comprises a housing 5, two hollow shafts 2 arranged in the housing 5, a plurality of groups of hollow blades 3 arranged on the hollow shaft 2 and connected to the hollow shaft 2, a steam inlet 12 in the shaft is arranged at one end of the hollow shaft 2, and a steam outlet 11 in the shaft is arranged at the other end of the hollow shaft 2, characterized in that: at least one hot air inlet 4 and a hot air outlet 10 are arranged on the side wall of the housing, the hot air outlet 10 is connected to the vacuum device, and the hot air inlet 4 is connected to the blower. The hollow shaft 2 is driven to rotate by the driving device 1. The two hollow shafts 2 are provided with hollow blades that cooperate with each other, which have high heat transfer efficiency and self-cleaning function of the heat transfer surface, and can prevent the material from sticking to the wall. Steam passes through the steam inlet 12 in the shaft through a rotary joint. The housing 5 is also provided with a feed port 6, a discharge port 8, and an observation port 9. A plurality of hot air inlets 4 are arranged on the housing 5 so that the hot air can be evenly passed into the housing, and the material can be fully contacted with the hot air during the stirring process, thereby improving the drying efficiency.

[0029] The hollow blade 3 is connected to the hollow shaft 2, and heating steam can be introduced. In addition to the stirring function, the hollow blade is also the main heat transfer body of the equipment. Figure 2 Each set of hollow blades includes two hollow fan-shaped blades, and the two fan-shaped blades are not connected. Figure 3 The fan-shaped blade is welded by two fan-shaped panels 31, an arc-shaped side panel 32, and one or two side panels 33. Along the spiral direction, the distance between the two fan-shaped panels becomes wider and wider. The fan-shaped panel 31 is used as the main heat transfer surface and is set as an inclined surface, so that the whole is formed in a spiral distribution. Therefore, when the material contacts the fan-shaped panel 31, as the blade rotates, the particles quickly slide away from the inclined surface, so that the heat transfer surface is constantly updated, thereby strengthening the heat transfer.

[0030] In production and use, the hollow blades directly exert force on the material, and the resistance it encounters is much greater than other resistances. Therefore, the reasonable layout of the blades is crucial. Therefore, we adopted a method of reasonably distributing the blades and increasing the resistance in sequence to achieve this goal. The maximum spacing between the two fan-shaped panels is set as the end point of each group of hollow blades 3. From the feeding end to the discharging end of the hollow shaft 2, the end position angle of the hollow blades 3 gradually differs to 90°, and the hollow blades are evenly distributed to form a uniform spiral, so that the material moves at a relatively uniform speed with less resistance.

[0031] Preferably, a scraper 13 is detachably connected to the end point of each group of hollow blades 3, and as the hollow shaft 2 rotates, the material deposited on the bottom of the housing 5 is scraped up to prevent dead corners.

[0032] Preferably, the hot air outlet 10 is arranged near the discharge port 8, and the hot air inlet 4 is arranged near the feed port 6. Such a design can make the hot air flow direction in the hollow shaft 2 opposite to the material discharge direction, so that the hot air is in full contact with the material.

[0033] Preferably, a heightened cover plate is provided on the top of the housing 5, and the hot air outlet 10 is provided on the heightened cover plate, so as to reduce the amount of dry powder brought out by the hot air outlet 10 and reduce material loss.

[0034] The utility model is particularly suitable for drying nano-scale molecular sieve adsorbents. In order to prevent the material in the shell from being contaminated, an air filter is installed at the hot air inlet 4, which is mainly used to filter dust particles with a particle size of 5μm and above. The air outlet surface of the non-woven filter material is polished to prevent the breakage and scattering of non-woven fibers from causing secondary pollution.

[0035] Preferably, a drain port 7 is provided at the bottom of the housing 5 .

[0036] Preferably, the hot air outlet 10 is connected to a dust removal device, preferably a bag dust collector.

[0037] The principle of the utility model is as follows: the molecular sieve adsorbent to be dried is put into the feed port 6, and the hot steam is introduced into the steam inlet 12 in the shaft to heat the hollow blade 3; the blower is started, and hot air is introduced into the shell 5 through the hot air inlet 4; the driving device is started, and the starting end (pointed end) of the hollow blade 3 is inserted into the material. Since the fan-shaped panel 31 is an inclined surface constituting a spiral, the impact force generated when contacting with the material particles or powder is dispersed, so that the powder attached to the heating surface can be automatically removed, the heating surface is kept smooth, and the efficient heat conduction performance is maintained. The hollow blades alternately compress (at the inclined surface of the fan-shaped panel 31) and loosen (at the gap between the hollow blades) the material, so the particles or fine powder near the heat transfer surface are stirred very violently, and the heat transfer coefficient is very high. The material dried by the hot air and the hollow blade 3 is discharged from the discharge port 8. The vacuum device extracts the hot air containing moisture in the shell 5.

[0038] The heat transfer area of ​​the hollow blades of the utility model occupies a large part, and in addition, the stirring and mixing make the materials violently turn over, so as to obtain a high heat transfer coefficient, so the floor area and space are very small, saving the capital construction cost of the plant. The gas consumption in the drying process is small, the flow rate is low, and the amount of dust carried away by the gas is small, so the gas dust recovery after drying is convenient, the recovery equipment is small in size, and the equipment investment can be saved. For the drying process that needs to recover the solvent, the solvent concentration can be greatly improved. Due to the special structure of the blades, the materials are alternately squeezed and relaxed during the drying process, which strengthens the drying. The filling rate of the material in the drying chamber is very high, which can reach 80%-90%, and the residence time of the material can be adjusted by adjusting the parameters such as the feeding speed, the rotation speed of the stirring shaft, and the material filling degree, and can be adjusted arbitrarily from a few minutes to a few hours. In addition, the movement of the material from the feed port 6 to the discharge port 8 in the dryer is basically a piston movement, and the residence time distribution is narrow, so the moisture content of the product is uniform. The blades have a certain axial angle on the stirring shaft, so the material can be dried continuously. The utility model can indirectly heat paste, granular, powdery, and slurry materials.

Claims

1. A hollow blade drying device, comprising a housing (5), a hollow shaft (2) disposed in the housing (5), and a plurality of groups of hollow blades (3) disposed on the hollow shaft (2) and connected to the hollow shaft (2), wherein one end of the hollow shaft (2) is provided with an in-shaft steam inlet (12), and the other end of the hollow shaft (2) is provided with an in-shaft steam outlet (11), characterized in that: At least one hot air inlet (4) and a hot air outlet (10) are provided on the side wall of the housing (5); the hot air outlet (10) is connected to the vacuum extraction device, and the hot air inlet (4) is connected to the blower.

2. The hollow blade drying device according to claim 1, characterized in that: Each set of hollow blades includes two hollow fan-shaped blades, which are not connected to each other. The fan-shaped blades are welded together by two fan-shaped panels (31), an arc-shaped side panel (32), and one or two side panels (33). Along the spiral direction, the distance between the two fan-shaped panels becomes wider and wider.

3. The hollow blade drying device according to claim 2, characterized in that: The point where the distance between the two fan-shaped panels is the largest is used as the end point of each group of hollow blades (3). From the feeding end to the discharging end of the hollow shaft (2), the angle of the end point position of the hollow blades (3) differs by 90°.

4. The hollow blade drying device according to claim 3, characterized in that: A scraper (13) is detachably connected to the end point of each group of hollow blades (3).

5. The hollow blade drying device according to any one of claims 1 to 4, characterized in that: The hot air outlet (10) is arranged near the discharge port (8), and the hot air inlet (4) is arranged near the feed port (6).

6. The hollow blade drying device according to any one of claims 1 to 4, characterized in that: A raised cover plate is arranged on the top of the housing (5), and a hot air outlet (10) is arranged on the raised cover plate.

7. The hollow blade drying device according to any one of claims 1 to 4, characterized in that: An air filter device is provided at the hot air inlet (4).

8. The hollow blade drying device according to any one of claims 1 to 4, characterized in that: There are two or four hollow shafts (2), and each hollow shaft (2) is provided with a hollow blade (3).

9. The hollow blade drying device according to any one of claims 1 to 4, characterized in that: The bottom of the housing (5) is provided with a drain outlet (7).

10. The hollow blade drying device according to any one of claims 1 to 4, characterized in that: The hot air outlet (10) is connected to a dust removal device.

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