A continuous drying apparatus for a pulverous material

Abstract

The utility model discloses a kind of continuous drying device of powdery material, it is related to powder drying technical field;Including shell, drying cylinder, filter screen plate and baffle;Drying cylinder is rotatably connected with shell, filter screen plate is fixedly connected with shell;Filter screen plate inside is sequentially divided into a, b, c, d four parts, a, d part is closed structure, b, c part is filter screen structure;B, c part is connected with drying gas inlet pipe;Drying cylinder is provided with cross baffle of cross in axial direction inside;Baffle sequentially divides the inside of drying cylinder into A, B, C, D four regions;Drying cylinder is set on the middle of A, B, C, D four regions with inlet and outlet pipe;The inlet and outlet pipe is all set with solenoid valve;Shell middle upper portion is provided with feed inlet, shell middle lower portion is provided with discharge port;The present application can realize the continuous drying operation, improve drying efficiency while also improving drying quality.

Description

Technical Field

[0001] This utility model relates to the field of powder drying technology, specifically a continuous drying device for powdery materials. Background Technology

[0002] Unreacted fine coal powder (particle size 5-90 μm or more, accounting for over 95%) produced by coal gasification is collected by n-hexane and exists as a fine powder. The resulting mixture of n-hexane and coal powder needs to be dried.

[0003] For these types of powdery materials, airflow dryers are typically used for drying. However, airflow dryers operate within a fixed drying drum. After one batch of powder is fed in, it needs to be completely dried and discharged before the next batch can be fed in for drying. This results in low drying efficiency and prevents continuous operation. Secondly, due to the high density of these fine powders, airflow has difficulty penetrating the interior, leading to incomplete drying. Utility Model Content

[0004] This invention overcomes the shortcomings of the prior art and proposes a continuous drying device for powdery materials, solving the problems of insufficient drying and low efficiency of fine coal powder.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A continuous drying device for powdered materials includes a shell, a drying cylinder, a filter plate, and partitions. Both the shell and the drying cylinder are horizontal cylindrical structures with a higher center and lower sides. The drying cylinder is coaxially arranged with the shell and located inside the shell. The drying cylinder is rotatably connected to the shell. The drying cylinder rotates within the shell via a drive structure. A filter plate is rotatably connected to the front end of the drying cylinder. The filter plate is fixedly connected to the shell. A cross-shaped partition is provided on the inner side of the filter plate, dividing it into four parts: a, b, c, and d. Part a is located at the top, and part d is located at the bottom. Parts a and d are closed structures, while parts b and c are filter structures. Parts b and c are both connected to drying air inlet pipes.

[0007] A cross-shaped partition is arranged axially inside the drying cylinder, dividing the interior of the drying cylinder into four regions: A, B, C, and D. Inlet and outlet pipes are installed in the middle of each of the four regions A, B, C, and D. Each inlet and outlet pipe is equipped with a solenoid valve. An inlet is located at the upper middle of the outer shell, and an outlet is located at the lower middle of the outer shell. The inlet is located on one side of section a, and the outlet is located on one side of section d. All four inlet and outlet pipes, as well as the inlet and outlet, are located on the same vertical cross-section. A first contact switch is fixedly installed on the outer wall of the inlet, and a second contact switch is fixedly installed on the outer wall of the outlet.

[0008] Furthermore, the drive structure includes a motor and a main shaft; the motor is fixedly installed at the front end of the housing, the drive end of the motor penetrates into the inside of the housing and is fixedly connected to one end of the main shaft, the main shaft penetrates through the drying cylinder and is rotatably connected to the housing, the main shaft is fixedly connected to the drying cylinder, and the other end of the main shaft is fixed at the center of the rear end face of the drying cylinder.

[0009] Furthermore, a blocking plate is fixedly connected to the side of the filter screen away from the drying cylinder, and the blocking plate is fixedly connected to the outer shell.

[0010] Furthermore, two partitions are provided on the inner side of the filter plate through the center. The two partitions are arranged in a cross shape, and the ends of the partitions are fixedly connected to the inner edge of the filter plate. The two partitions divide the filter plate into four parts, a, b, c, and d, clockwise.

[0011] Furthermore, two baffles are arranged axially inside the drying cylinder; the two baffles pass through the center of the drying cylinder and are arranged in a cross shape.

[0012] Furthermore, the cross-sectional area of ​​the inlet and outlet pipes is larger than the cross-sectional area of ​​the inlet and outlet.

[0013] Furthermore, an exhaust port is provided on the outer casing.

[0014] Furthermore, the exhaust port is connected to an exhaust gas recovery device.

[0015] Furthermore, the exhaust gas recovery device includes a heat exchanger for waste gas and dry gas, a cooler, a gas-liquid separator, and a heater. The exhaust port is connected to the high-temperature inlet of the heat exchanger, the low-temperature outlet of the heat exchanger is connected to the cooler, the cooler is connected to the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to a storage tank, the gas outlet of the gas-liquid separator is connected to the low-temperature inlet of the heat exchanger, the high-temperature outlet of the heat exchanger is connected to the heater, and the heater is connected to the drying cylinder.

[0016] The beneficial effects of this utility model compared to the prior art are as follows:

[0017] This invention enables continuous drying operations through the rotation of the drying drum. The drying drum is divided into zones by partitions, which are used for loading, drying, and unloading in sequence. These three operations can be carried out continuously and synchronously. At the same time, hot drying air is used as the air source for drying, which further improves the drying efficiency.

[0018] Meanwhile, the entire drying process is carried out in a dynamic state. The powder inside the drying drum is in a rolling state, and the hot drying gas comes into contact with the material intermittently. Before the material comes into contact with the hot drying gas again, the material has already been rolled and turned inside the drying drum, and the water vapor generated in this process has also been discharged. When the material comes into contact with the hot drying gas again, it will be in more complete contact with the material, and the concentration of the hot drying gas will not be affected by the water vapor, resulting in higher drying efficiency.

[0019] This invention can also be applied to the drying of powdered materials produced using volatile organic compounds, water, and other components as raw materials or solvents, to achieve rapid drying of the products. Attached Figure Description

[0020] Figure 1 This is a side cross-sectional view of the continuous drying device for powdered materials described in this utility model;

[0021] Figure 2 This is a schematic diagram of the filter screen.

[0022] Figure 3 This is a structural diagram of the drying cylinder and its internal partitions;

[0023] Figure 4 This is a cross-sectional view of the drying drum;

[0024] Figure 5 This is a connection diagram of the exhaust gas recovery device.

[0025] Figure label:

[0026] 1-Outer shell, 2-Drying cylinder, 3-Filter plate, 4-Motor, 5-Main shaft, 6-Baffle plate, 7-Blocking plate, 8-Separator strip, 9-Drying gas inlet pipe, 10-Exhaust port, 11-Inlet and outlet pipes, 12-Solenoid valve, 13-Inlet, 14-Outlet. Detailed Implementation

[0027] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto. Example

[0028] See Figures 1 to 4This embodiment proposes a continuous drying device for powdered materials, including a shell 1, a drying cylinder 2, a filter plate 3, a motor 4, a main shaft 5, and a partition plate 6. Both the shell 1 and the drying cylinder 2 are horizontal cylindrical structures with a higher center and lower sides. The drying cylinder 2 is coaxially arranged with the shell 1 and is located inside the shell 1. The motor 4 is fixedly installed at the front end of the shell 1. The driving end of the motor 4 penetrates into the inner side of the shell 1 and is fixedly connected to one end of the main shaft 5. The main shaft 5 penetrates the drying cylinder 2 and is rotatably connected to the shell 1. The main shaft 5 is fixedly connected to the drying cylinder 2, and the other end of the main shaft 5 is fixed at the center of the rear end face of the drying cylinder 2. Under the drive of the motor 4, the main shaft 5 drives the drying cylinder 2 to rotate around the main shaft 5.

[0029] A filter plate 3 is rotatably connected to the front end face of the drying cylinder 2; a blocking plate 7 is fixedly connected to the side of the filter plate 3 away from the drying cylinder 2, and the blocking plate 7 is fixedly connected to the outer shell 1.

[0030] The filter plate 3 is circular, and its cross-sectional size is the same as that of the drying cylinder 2. Two partitions 8 are arranged at the center of the inner side of the filter plate 3, forming a cross shape. The ends of the partitions 8 are fixedly connected to the inner edge of the filter plate 3. The two partitions 8 divide the filter plate 3 into four equal parts (a, b, c, and d) clockwise. Part a is located at the top, and part d is located at the bottom. Parts a and d are closed structures, while parts b and c are filter structures. Parts b and c are both connected to a drying gas inlet pipe 9. The end of the drying gas inlet pipe 9 away from the filter plate 3 extends to the front of the outer casing 1 and connects to the drying gas supply device. Drying gas can be introduced into parts b and c through the drying gas inlet pipe 9. An exhaust port 10 is provided on the outer casing 1.

[0031] Two partitions 6 are axially arranged inside the drying cylinder 2; the two partitions 6 pass through the center of the drying cylinder 2 and intersect in a cross shape; the two partitions 6 divide the interior of the drying cylinder 2 into four regions: A, B, C, and D. Inlet and outlet pipes 11 are arranged in the middle of each of the four regions A, B, C, and D on the drying cylinder 2; each inlet and outlet pipe 11 is equipped with a solenoid valve 12; an inlet 13 is located at the upper middle of the outer shell 1, and an outlet 14 is located at the lower middle of the outer shell 1; the inlet 13 is located on one side of section a, and the outlet 14 is located on one side of section d; all four inlet and outlet pipes 11, as well as the inlet 13 and outlet 14, are located on the same vertical cross-section; a first contact switch is fixedly installed on the outer wall of the inlet 13, and a second contact switch is fixedly installed on the outer wall of the outlet 14. The cross-sectional area of ​​the inlet and outlet pipes 11 is larger than the cross-sectional area of ​​the inlet 13 and the outlet 14.

[0032] When the inlet / outlet pipe 11 of any of the zones A, B, C, and D rotates to directly below the inlet 13, the first contact switch triggers the corresponding solenoid valve 12 to open, allowing material to be fed into that zone. During feeding, the motor 4 does not operate, and the drying drum 2 remains stationary. After feeding is complete, the motor 4 resumes operation, the inlet / outlet pipe 11 of that zone leaves the inlet 13, and the first contact switch triggers the corresponding solenoid valve 12 to close, completing the feeding of that zone. When that zone rotates to the bottom, and the inlet / outlet pipe 11 of that zone rotates to directly below the outlet 14, the second contact switch triggers the corresponding solenoid valve 12 of that zone to open, allowing material to be discharged from that zone. During discharge, the motor 4 does not operate, and the drying drum 2 remains stationary. After discharge is complete, the motor 4 resumes operation, the inlet / outlet pipe 11 of that zone leaves the outlet 14, and the second contact switch triggers the corresponding solenoid valve 12 to close, completing the discharge of that zone.

[0033] Taking the drying of a mixture of n-hexane and coal powder as an example, the working process of a continuous drying device for powdered materials proposed in this embodiment is as follows:

[0034] Initially, the inlet / outlet pipe 11 of area A of the drying cylinder 2 is opposite to the inlet 13 on the top of the outer shell 1. The first contact switch triggers the solenoid valve 12 on the inlet / outlet pipe 11 of area A to open, allowing material to be fed into area A. During the feeding process, the motor 4 does not work, and the drying cylinder 2 remains stationary. After feeding is completed, the motor 4 starts working, driving the drying cylinder 2 to rotate via the main shaft 5, and the solenoid valve 12 on the inlet / outlet pipe 11 of area A closes. At this time, the drying gas inlet pipe 9 is opened to introduce hot drying gas into sections b and c. Area A rotates sequentially to sections b and c. Since sections b and c have a filter structure, the hot drying gas will enter area A to dry the material therein. During the process of moving to sections b and c, the feeding process is the same as that of section A. Sections B and C are also fed in sequence. The feeding process of sections B and C is also the drying process of the material in section A. After section C finishes feeding, the material in section A is dried. Section A rotates to the bottom. When the inlet and outlet pipe 11 of section A rotates to directly below the outlet 14, the second contact switch triggers the solenoid valve 12 of the inlet and outlet pipe 11 of section A to open, and the material is discharged from section A. During the discharge process of section A, the material in sections B and C is dried at the same time as the feeding process of section D. The feeding method of section D is the same as that of section A. During the feeding process of section D, the drying cylinder 2 remains stationary.

[0035] After the feeding in area D is finished, the drying cylinder 2 continues to rotate through the motor 4 and the main shaft 5, and the solenoid valve 12 on the feed pipe 11 in area A is closed.

[0036] Then feed material into area A again and repeat the above steps to complete the continuous drying of the material.

[0037] The rotation cycle setting of drying cylinder 2 depends on the drying effect of the material, and the time for one rotation is usually 40-80 minutes.

[0038] The ratio of the length to the inner diameter of the drying cylinder 2: This ratio determines the disturbance of the material by the gas inside the drying cylinder 2. The greater the disturbance, the better the drying effect. This range is set between 1.5 and 0.5.

[0039] The ratio of feed volume to the volume of drying cylinder 2: This ratio determines the space in which the material moves within drying cylinder 2, affecting the drying speed and drying effect, and is set between 1 / 10 and 1 / 3.

[0040] Specifically, in this embodiment, the volatile components (n-hexane and water) in the mixture comprise approximately 50%. Hexane has a boiling point of 68.7°C and is a relatively easy-to-dry medium. The drying cylinder 2 is configured with a length-to-inner-diameter ratio of 0.5, a rotation cycle of 1 hour, and a feed rate of 1 / 5 of the drying cylinder 2's volume. Specific parameters are: drying cylinder 2 is 0.5m long, has an inner diameter of 1m, and a feed rate of 160kg (40kg per individual area within the drying cylinder 2). The heat source for drying is an inert gas at 0.3MPa and 115°C.

[0041] Through one cycle of operation, the volatile components in 160 kg of material are reduced to below 3%. During this cycle, the actual drying time in each zone of drying drum 2 is 0.5 hours. Example

[0042] This embodiment further adds a tail gas recovery device to the existing embodiment 1. See [link to embodiment 1]. Figure 5 The exhaust gas recovery device includes a heat exchanger for waste gas and dry gas, a cooler, a gas-liquid separator, and a heater; the exhaust port 10 is connected to the high-temperature inlet of the heat exchanger, the low-temperature outlet of the heat exchanger is connected to the cooler, the cooler is connected to the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to a storage tank, the gas outlet of the gas-liquid separator is connected to the low-temperature inlet of the heat exchanger via a booster fan, the high-temperature outlet of the heat exchanger is connected to the heater, and the heater is connected to the drying cylinder 2.

[0043] The exhaust gas discharged from the outer shell 1 exchanges heat with the drying gas through the heat exchanger. The heated drying gas enters the drying cylinder 2 through the drying gas inlet pipe 9 and is utilized. After cooling, the non-exhaust gas enters the cooler for further cooling and then enters the gas-liquid separator for separation into drying gas and liquid phase substances. The liquid phase substances enter the storage tank for storage and use as solvents. The drying gas is sent to the heat exchanger, heated by the heater, and recycled as hot drying gas.

[0044] The above description is a further detailed explanation of the present invention in conjunction with specific preferred embodiments. It should not be considered that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the present invention, and all such deductions or substitutions should be considered to fall within the scope of patent protection determined by the submitted claims.

Claims

1. A continuous drying apparatus for powdered materials, characterized in that, The device includes an outer shell (1), a drying cylinder (2), a filter plate (3), and a partition plate (6). The outer shell (1) and the drying cylinder (2) are both horizontal cylindrical structures with a high center and low sides. The drying cylinder (2) is coaxially arranged with the outer shell (1) and is located inside the outer shell (1). The drying cylinder (2) is rotatably connected to the outer shell (1). The drying cylinder (2) rotates inside the outer shell (1) through a driving structure. The front end face of the drying cylinder (2) is rotatably connected to the filter plate (3). The filter plate (3) is fixedly connected to the outer shell (1). The inner side of the filter plate (3) is provided with cross-shaped partitions (8). The partitions (8) divide the filter plate (3) into four parts: a, b, c, and d. Part a is located at the top, and part d is located at the bottom. Parts a and d are closed structures, while parts b and c are filter structures. Parts b and c are both connected to a drying air inlet pipe (9). A cross-shaped partition (6) is provided inside the drying cylinder (2) along the axial direction; the partition (6) divides the interior of the drying cylinder (2) into four regions: A, B, C, and D; a feed pipe (11) is provided in the middle of each of the four regions A, B, C, and D on the drying cylinder (2); a solenoid valve (12) is provided on each of the feed pipes (11); a feed inlet (13) is provided in the upper middle of the outer shell (1), and a discharge outlet (14) is provided in the lower middle of the outer shell (1); the feed inlet (13) is located on one side of part a, and the discharge outlet (14) is located on one side of part d; the four feed pipes (11), as well as the feed inlet (13) and the discharge outlet (14), are all located on the same vertical section; a first contact switch is fixedly installed on the outer wall of the feed inlet (13), and a second contact switch is fixedly installed on the outer wall of the discharge outlet (14).

2. The continuous drying apparatus for powdered materials according to claim 1, characterized in that, The drive structure includes a motor (4) and a main shaft (5); a motor (4) is fixedly installed at the front end of the outer shell (1), the drive end of the motor (4) penetrates into the inner side of the outer shell (1) and is fixedly connected to one end of the main shaft (5), the main shaft (5) penetrates through the drying cylinder (2), and the main shaft (5) is rotatably connected to the outer shell (1), the main shaft (5) is fixedly connected to the drying cylinder (2), and the other end of the main shaft (5) is fixed at the center of the rear end face of the drying cylinder (2).

3. The continuous drying apparatus for powdered materials according to claim 1, characterized in that, A blocking plate (7) is fixedly connected to the side of the filter plate (3) away from the drying cylinder (2), and the blocking plate (7) is fixedly connected to the outer shell (1).

4. The continuous drying apparatus for powdered materials according to claim 1, characterized in that, Two partitions (8) are provided on the inner side of the filter plate (3) through the center. The two partitions (8) are cross-shaped and the ends of the partitions (8) are fixedly connected to the inner edge of the filter plate (3). The two partitions (8) divide the filter plate (3) into four parts, a, b, c and d, clockwise.

5. The continuous drying apparatus for powdered materials according to claim 1, characterized in that, Two baffles (6) are arranged axially inside the drying cylinder (2); the two baffles (6) pass through the center of the drying cylinder (2) and are arranged in a cross shape.

6. The continuous drying apparatus for powdered materials according to claim 1, characterized in that, The cross-sectional area of ​​the inlet and outlet pipes (11) is greater than the cross-sectional area of ​​the inlet (13) and the outlet (14).

7. The continuous drying apparatus for powdered materials according to claim 1, characterized in that, An exhaust port (10) is provided on the outer casing (1).

8. A continuous drying apparatus for powdered materials according to claim 7, characterized in that, The exhaust port (10) is connected to an exhaust gas recovery device.

9. A continuous drying apparatus for powdered materials according to claim 8, characterized in that, The exhaust gas recovery device includes a heat exchanger for waste gas and dry gas, a cooler, a gas-liquid separator, and a heater. The exhaust port (10) is connected to the high-temperature inlet of the heat exchanger, the low-temperature outlet of the heat exchanger is connected to the cooler, the cooler is connected to the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to the storage tank, the gas outlet of the gas-liquid separator is connected to the low-temperature inlet of the heat exchanger, the high-temperature outlet of the heat exchanger is connected to the heater, and the heater is connected to the drying cylinder (2).

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