Stirring feeding device suitable for spray dryer

Abstract

The utility model relates to the field of chemical production equipment, in particular to a stirring and feeding device suitable for a spray dryer, which comprises a stirring kettle and a transmission component, a circulating heating assembly is arranged outside the stirring kettle, a stirring shaft is arranged inside the stirring kettle, and the stirring shaft is connected with the transmission assembly; the stirring shaft is of a hollow structure, an opening is formed in the upper end of the stirring shaft, a plurality of holes with different sizes are formed in the lower end of the stirring shaft, and compressed air is introduced into the stirring shaft through the opening and is released through the holes; and the stirring shaft is connected with a stirring paddle. According to the utility model, the circulating heating assembly is arranged outside the stirring kettle, so that the temperature of the slurry can be maintained in a relatively high state and the viscosity of the slurry can be maintained, and a relatively good atomization effect is achieved in the spray drying process. Compressed air is introduced into the bottom of slurry from the stirring shaft, and the compressed air moves upwards to drive the slurry to move longitudinally, so that slurry precipitation can be effectively reduced, and the uniformity of the slurry is better guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of chemical production equipment, and particularly relates to a stirring feeding device applicable to a spray dryer. Background Art

[0002] The spray dryer uses high-temperature air flow to contact with atomized slurry droplets, and completes the evaporation and drying of water within a short time, thereby completing drying and powder making. Due to characteristics such as high efficiency, continuity, and easy control, the spray dryer is widely used in fields such as food, medicine, chemical industry, materials, metallurgy, and scientific research. However, the spray dryer has very high requirements for the uniformity of the slurry, especially in fields such as materials and scientific research, and the stirrer is a conventional device currently used for feeding in the spray dryer.

[0003] For the preparation of powder using a spray dryer, the better the stirring effect, the better the uniformity of the slurry, and the more stable and uniform the prepared powder. However, the current equipment cannot meet all application scenarios. Some slurries settle quickly and are extremely easy to precipitate or stratify. After precipitation or stratification, the uniformity of the slurry cannot be maintained, and the uniformity of the prepared powder will also be greatly reduced. At the same time, the precipitate is easy to block the pipeline, and dredging will cause waste of labor and cost. If it is some special solvents, there will also be a certain risk factor in dredging. Therefore, how to avoid slurry precipitation and maintain the stability and uniformity of the slurry is a problem that needs to be overcome.

[0004] At the same time, the viscosity of the slurry is also related to the atomization effect after the slurry enters the spray drying tower. Whether the spray dryer uses a physical and chemical disk atomization or a two-fluid spray gun for atomization, the atomization effect is also directly related to the uniformity and particle uniformity of the final finished powder.

[0005] Therefore, how to improve the uniformity and fluidity of the slurry in the stirring feeding system of the spray dryer according to different production requirements is a problem that needs to be explored. Summary of the Utility Model

[0006] The utility model provides a stirring feeding device applicable to a spray dryer, which is used to solve the problem that the existing stirring feeding device cannot meet the atomization requirements of the spray dryer in different scenarios.

[0007] In order to achieve the above purpose, the technical scheme adopted by the utility model is:

[0008] A stirring feeding device applicable to a spray dryer, comprising a stirring kettle and a transmission component; a circulating heating component is arranged outside the stirring kettle, and a stirring shaft is arranged inside. The stirring shaft is connected to the transmission component; the stirring shaft is of a hollow structure, with an opening at the upper end and a plurality of holes of different sizes at the lower end. Compressed air is introduced into the interior of the stirring shaft through the opening and released through the holes; stirring paddles are connected to the stirring shaft.

[0009] In some embodiments, the circulating heating component includes a heat preservation layer arranged outside the stirring kettle. A jacket structure is formed between the heat preservation layer and the stirring kettle, and upper openings and lower openings are respectively arranged on two opposite sides of the heat preservation layer. Circulating hot water is introduced into the jacket through the lower opening and flows out through the upper opening for circulating heating.

[0010] In some embodiments, a stainless steel pipe is movably arranged inside the stirring shaft, and the upper end of the stainless steel pipe extends out of the stirring shaft.

[0011] In some embodiments, a compressed air hose is connected to the upper end of the stainless steel pipe, and a solenoid valve is arranged on the compressed air hose. The solenoid valve controls the intermittent introduction of compressed air into the stirring shaft.

[0012] In some embodiments, a plurality of holes of different sizes are arranged at the bottom of the stainless steel pipe.

[0013] In some embodiments, the stirring paddles include an upper layer stirring paddle and a lower layer stirring paddle, and the lower layer stirring paddle is adapted to the shape of the bottom of the stirring kettle.

[0014] In some embodiments, two ball valves are arranged at the bottom outlet of the stirring kettle.

[0015] In some embodiments, the transmission component includes an electric pump, and the electric pump drives the stirring shaft to rotate for stirring.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] (1) The present utility model provides a stirring feeding device applicable to a spray dryer. By arranging a circulating heating component outside the stirring kettle, the temperature of the slurry can be maintained at a relatively high level and its viscosity can be maintained, so that the spray drying process has a better atomization effect. By arranging compressed air to enter the bottom of the slurry from the stirring shaft, the upward movement of the compressed air will drive the longitudinal movement of the slurry, thereby effectively reducing the precipitation of the slurry and better ensuring the uniformity of the slurry. By arranging a plurality of holes with different sizes at the bottom of the stirring shaft, when the compressed air enters the stirring kettle and contacts the slurry, it can be dispersed and form bubbles of different sizes, which is beneficial to the rapid upward movement of the bottom slurry and improves the mixing and stirring efficiency of the slurry in the longitudinal direction, thereby better preventing precipitation.

[0018] (2) The stirring feeding device applicable to a spray dryer of the present utility model is arranged in the form of a jacket outside the stirring kettle by arranging a circulating heating component, and circulating hot water is arranged in the jacket, which can heat the slurry in the stirring kettle in a water bath manner, and the heating process is mild and controllable; and during the water bath heating, heat is transferred through the side wall and the bottom wall at the same time, and the temperature uniformity of the upper and lower parts of the stirring kettle can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the stirring feeding device of the air pipe of the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the holes at the bottom of the stirring shaft of the present utility model;

[0022] Among them: 1 - stirring kettle, 2 - stirring shaft, 3 - hole, 4 - upper stirring paddle, 5 - lower stirring paddle, 6 - heat preservation layer, 7 - jacket, 8 - upper opening, 9 - lower opening, 10 - stainless steel pipe, 11 - compressed air hose, 12 - solenoid valve, 13 - first ball valve, 14 - second ball valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following will clearly and completely describe the technical solutions of the present utility model in combination with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the protection scope of the present utility model.

[0024] As shown Figure 1-2 in the figure, a stirring and feeding device applicable to a spray dryer according to the present utility model includes a stirring kettle 1 and a transmission assembly (not shown in the figure); a circulating heating assembly is arranged outside the stirring kettle 1, and a stirring shaft 2 is arranged inside. The stirring shaft 2 is connected to the transmission assembly; the stirring shaft 2 is of a hollow structure, with an opening at the upper end and a plurality of holes 3 of different sizes at the lower end. Compressed air is introduced into the interior of the stirring shaft 2 through the opening and released through the holes 3; a stirring paddle is connected to the stirring shaft 2.

[0025] By arranging a circulating heating assembly outside the stirring kettle 1, the slurry can be heated in a cycle, so as to maintain the temperature of the slurry at a relatively high level, enabling better atomization effect when the slurry is atomized and being beneficial to maintaining the viscosity of the slurry; at the same time, raising the temperature of the slurry can accelerate the heat exchange process between the high-temperature gas flow and the liquid inside the spray dryer, thereby accelerating the spraying speed, increasing the output while reducing energy consumption.

[0026] By setting the stirring shaft 2 to be of a hollow structure, compressed air is introduced into the bottom of the stirring kettle 1 through the holes 3 at the lower end of the hollow stirring shaft 2. The upward movement of the compressed air will drive the longitudinal movement of the slurry to perform longitudinal mixing of the slurry, thereby effectively reducing the precipitation of the slurry and better ensuring the uniformity of the slurry. By arranging a plurality of holes 3, the compressed air can be dispersed when entering the stirring kettle 1 and contacting the slurry, thus better preventing precipitation; and, since the compressed air moves upward in the form of bubbles in the slurry, by setting the holes 3 at the lower end of the stirring shaft 2 to be of different sizes and unevenly distributed, different-sized bubbles can be formed. The large bubbles have a larger surface area and can drive more slurry to move upward, and the small bubbles rise faster, which is beneficial to the rapid upward movement of the bottom slurry and improves the longitudinal slurry mixing and stirring efficiency.

[0027] Specifically, the circulating heating assembly includes a heat preservation layer 6 arranged outside the stirring kettle 1. A jacket 7 structure is formed between the heat preservation layer 6 and the stirring kettle 1, and upper openings 8 and lower openings 9 are respectively arranged on two opposite sides of the heat preservation layer 6. Circulating hot water is introduced into the jacket 7 through the lower opening 9 and flows out through the upper opening 8 for circulating heating.

[0028] By arranging the circulating heating assembly in the form of a jacket 7 outside the stirring kettle 1 and setting circulating hot water in the jacket 7, the slurry in the stirring kettle 1 can be heated in a water bath manner, and the heating process is mild and controllable; and during the water bath heating, heat is transferred through the side wall and the bottom wall at the same time, which can maintain the temperature uniformity of the upper and lower parts of the stirring kettle 1.

[0029] Specifically, a stainless steel pipe 10 is movably disposed in the stirring shaft 2, and the upper end of the stainless steel pipe 10 extends out of the stirring shaft 2. A compressed air hose 11 is connected to the upper end of the stainless steel pipe 10, and a solenoid valve 12 is disposed on the compressed air hose 11. The solenoid valve 12 controls the intermittent flow of compressed air into the stirring shaft 2. A plurality of holes 3 of different sizes are opened at the bottom of the stainless steel pipe 10.

[0030] By providing the stainless steel pipe 10 and directly providing the hole 3 at the bottom of the stainless steel pipe 10, it is possible to prevent the long-term introduction of compressed air from damaging the stirring shaft 2, thereby increasing the service life of the device; by providing the solenoid valve 12, the entry of compressed air can be controlled in a timely and quantitative manner. Specifically, the solenoid valve 12 is interlocked with the transmission component. When the stirring is turned on, the solenoid valve 12 is simultaneously opened and controls the entry of compressed air. More specifically, the pressure of the compressed air is 0.3MPa-0.5MPa, and the solenoid valve 12 controls the frequency of compressed air entry to exhaust air for 10s-18s per 1min.

[0031] Specifically, the stirring paddle includes an upper stirring paddle 4 and a lower stirring paddle 5, and the lower stirring paddle 5 is adapted to the shape of the bottom of the stirring tank 1. Two ball valves are provided at the bottom outlet of the stirring tank 1. The transmission assembly includes an electric pump, which drives the stirring shaft 2 to rotate for stirring. It should be noted that the transmission assembly and the stirring tank 1 are connected in a conventional manner. For example, the transmission assembly can be provided on the cover of the stirring tank 1 (not shown in the figure).

[0032] By setting the hole 3 at the bottom of the stirring shaft 2, the compressed air can only flow downward into the stirring tank 1, which can drive the slurry at the bottom of the stirring tank 1 to move, so that the slurry is mixed more completely; by setting the upper stirring paddle 4 and the lower stirring paddle 5, the upper slurry and the lower slurry can be stirred respectively, and the lower stirring paddle is adapted to the shape of the bottom of the stirring tank 1, so that the slurry is stirred more fully, and the hole 3 is set at the bottom of the stirring shaft 2 below the lower stirring paddle 5, which is conducive to better stirring and mixing of the lower slurry. By setting two ball valves at the bottom of the stirring tank 1, the first ball valve 13 is located at the upper part and keeps the normally open state, and the second ball valve 14 is located at the lower part, which is used to control the outflow of the stirring slurry. By adding the first ball valve 13, when the second ball valve 14 is damaged during use, the first ball valve 13 can be closed during use to repair the second ball valve 14, and the pipeline can also be cleared and repaired when the rear end of the slurry outlet pipeline is blocked, thereby improving the safety of operation.

[0033] The utility model is further described above with the help of specific embodiments, but it should be understood that the specific description here should not be construed as limiting the essence and scope of the utility model. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the utility model.

Claims

1. A stirring feeding device suitable for a spray dryer, characterized in that: It comprises a stirring kettle and a transmission component; a circulating heating component is arranged outside the stirring kettle, and a stirring shaft is arranged inside the stirring kettle, and the stirring shaft is connected to the transmission component; the stirring shaft is a hollow structure, with an opening at the upper end and a plurality of holes of different sizes at the lower end, and compressed air enters the stirring shaft through the opening and is released through the holes; a stirring paddle is connected to the stirring shaft.

2. The stirring feeding device suitable for a spray dryer according to claim 1, characterized in that: The circulating heating component includes an insulating layer arranged outside the stirring tank, a jacket structure is formed between the insulating layer and the stirring tank, and an upper opening and a lower opening are respectively provided on opposite sides of the insulating layer. Circulating hot water enters the jacket through the lower opening and flows out through the upper opening for circulating heating.

3. The stirring feeding device suitable for a spray dryer according to claim 1, characterized in that: A stainless steel pipe is movably arranged in the stirring shaft, and the upper end of the stainless steel pipe extends out of the stirring shaft.

4. The stirring feeding device suitable for a spray dryer according to claim 3, characterized in that: The upper end of the stainless steel pipeline is connected with a compressed air hose, and the compressed air hose is provided with a solenoid valve, and the solenoid valve controls the compressed air to intermittently pass into the stirring shaft.

5. The stirring feeding device suitable for a spray dryer according to claim 4, characterized in that: A plurality of holes of different sizes are arranged at the bottom of the stainless steel pipe.

6. The stirring feeding device suitable for a spray dryer according to claim 1, characterized in that: The stirring paddle comprises an upper stirring paddle and a lower stirring paddle, and the lower stirring paddle is adapted to the shape of the bottom of the stirring kettle.

7. The stirring feeding device suitable for a spray dryer according to claim 1, characterized in that: The bottom outlet of the stirring kettle is provided with two ball valves.

8. The stirring feeding device suitable for a spray dryer according to claim 1, characterized in that: The transmission assembly includes an electric pump, and the electric pump drives the stirring shaft to rotate for stirring.

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