Expansion joint device of cold air drying system

Abstract

The utility model relates to the technical field of drying devices, and discloses an expansion joint device of a cold air drying system, expansion joints are arranged above the drying device, a plurality of expansion joints are sequentially connected, a motor is fixed on the outer wall of each expansion joint, and a steerable baffle, a partition plate and a fixed baffle are arranged in each expansion joint. The two ends of the partition plate and the two ends of the fixed baffles are fixed to the inner wall of the expansion joint, the roots of the fixed baffles are fixed to the inner wall of the expansion joint or the partition plate at the interval of 30-70 cm, the fixed baffles are installed in a downwards-inclined mode with the inclination angle ranging from 30 degrees to 60 degrees, and it is guaranteed that the fixed baffles do not make contact with one another; the steerable baffle is connected with the partition plate and the motor through the shaft, the motor drives the shaft to rotate, the angle of the steerable baffle is adjusted, gas is guided to enter the expansion joint, accordingly, the gas flow speed is controlled, turbulent flow is formed through the partition plate and the fixed baffle, and dust particles carried in gas flow are further blocked. The drying effect in the traditional process, the recovery problem caused by dissipation of a large amount of dust and the environmental problem caused by the recovery problem are improved.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, particularly to the field of drying equipment technology for high moisture content dust materials, and relates to an expansion joint device for a cold air drying system. Background Technology

[0002] Generally, material drying methods are divided into two types: hot material with cold air and hot air with cold material. The advantage of hot material with cold air is that the material can have a relatively high specific heat capacity; the disadvantage is that it is limited by the heating method and the uniformity of heating. The advantage of cold material with hot air is that the heat contained in the gas is relatively uniform, and the gas can slowly penetrate the heat into the material for drying or heating; however, the disadvantage is that the specific heat capacity of the gas is low, and gas is a poor heat transfer medium, with a limited heat-carrying capacity per unit volume or unit mass. Increasing the gas flow rate is necessary to improve heat exchange efficiency, but increasing the gas flow rate makes it easier for powder to fly around and become difficult to collect.

[0003] In the production processes of industries such as chemical, pharmaceutical, and electronics, there is a need to dry solid powder materials, and one of the most commonly used drying devices is the fluidized bed dryer.

[0004] The existing technical problems with fluidized bed drying are:

[0005] 1) When using hot air to dry, uneven air distribution may cause material to accumulate, resulting in uneven drying and short-circuiting of hot air flow, thus leading to poor drying effect and low thermal efficiency.

[0006] 2) Solid powdery materials are easy to disperse, which will not only cause air vent blockage and affect the drying effect, but also waste materials;

[0007] 3) During operation, the vibrating fluidized bed dryer continuously vibrates up and down, throwing the material forward in a horizontal direction. Air entering through the inlet duct passes through the material layer multiple times, eventually completing dust removal before being discharged through the outlet duct. However, since the air discharged through the outlet duct is often not completely dry, a certain amount of material will be adsorbed at the inlet end of the outlet duct. With prolonged use, the adsorbed material accumulates, reducing the exhaust area of ​​the outlet duct and consequently decreasing the operating efficiency of the device.

[0008] Therefore, this utility model provides an expansion joint device for a cold air drying system to solve the problems mentioned in the background art. Utility Model Content

[0009] The purpose of this invention is to provide an expansion joint device for a cold air drying system. The direction of the drying airflow and the direction of the airflow in the expansion joint are opposite to the direction of material movement. On the one hand, this creates a convection effect, resulting in higher drying efficiency. On the other hand, the dust in the expansion joint is blocked by the baffle and slowly falls onto the drying device with the airflow, achieving a dust removal effect.

[0010] The technical problem solved by this utility model is to avoid the generation of a large amount of dust during the drying process of materials, and to improve the environmental problems and recycling problems caused by the large amount of dust emission in the traditional drying process.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] This utility model provides an expansion joint device for a cold air drying system. The expansion joint is located above the drying device, and multiple expansion joints are connected in sequence. A motor is fixed to the outer wall of the expansion joint. Inside the expansion joint, there are steerable baffles, partitions, and fixed baffles. The two ends of the partitions and fixed baffles are fixed to the inner wall of the expansion joint, and the root of the fixed baffles is fixed to the inner wall of the expansion joint. A fixed baffle is installed every 30-70 cm, with its root fixed to the partition. The fixed baffles are installed at an angle of 30°-60° downwards to ensure that each fixed baffle does not contact the other. The steerable baffles are connected to the partitions and the motor via a shaft. The motor drives the shaft to rotate, adjusting the angle of the steerable baffles to guide gas into the expansion joint, thereby controlling the gas flow rate. The partitions and fixed baffles create turbulence, further blocking dust particles carried in the airflow, improving the drying effect in traditional processes and reducing the recycling problems and environmental issues caused by the large amount of dust escaping.

[0013] Preferably, the number of expansion joints can be determined according to the length of the drying device, with an installation spacing of 2-10 joints every 4-10 meters, used to compensate for gas expansion and control gas flow rate.

[0014] Preferably, the working angle of the steerable baffle is between 0° and 90°.

[0015] Preferably, there can be several fixed baffles.

[0016] Preferably, each expansion joint is provided with a temperature monitoring device and a pressure monitoring device at its front end, and a temperature monitoring control device and a pressure monitoring control device at its rear end, and the temperature monitoring device, pressure monitoring device, temperature monitoring control device, and pressure monitoring control device are connected to the motor.

[0017] Preferably, the angle of the steerable baffle is adjusted based on the temperature and pressure differences monitored between the expansion joints to regulate the gas flow rate and volume, thereby controlling the amount of dust in the gas.

[0018] Preferably, each expansion joint is covered with an insulation layer between and on the outside of the expansion joints.

[0019] Preferably, the direction of material movement in the cold air drying system is opposite to the direction of the drying airflow or the direction of airflow in the expansion joint.

[0020] Preferably, the drying device consists of rollers, a conveyor belt drive motor, and a conveyor belt.

[0021] Preferably, the cold air outlet of the drying device is under a slight negative pressure.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] Several expansion joints were added above the drying unit. When a small amount of dust enters the expansion joint with the gas flow, the sudden increase in the diameter slows down the gas flow rate and alleviates the gas expansion. After the flow rate decreases, the dust accumulates on the baffles due to gravity and falls onto the drying unit, reducing the difficulty of dust collection and lowering the operating load of the post-treatment unit.

[0024] The expansion joint device provided by this utility model has a simple structure, low cost, and achieves good technical results. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the expansion joint device of the cold air drying system of this utility model;

[0026] Figure 2 The flowchart shows the expansion joint device of the cold air drying system of this utility model.

[0027] Figure 3 This is a perspective view of the expansion joint device of the cold air drying system of this utility model.

[0028] Figure labels: 1. Expansion joint; 2. Drying device; 3. Rotatable baffle; M. Motor; TI. Temperature monitoring device; TIC. Temperature monitoring and control device; PI. Pressure monitoring device; PIC. Pressure monitoring and control device; 4. Baffle; 5. Shaft; 6. Gas flow direction; 7. Fixed baffle; 8. Roller; 9. Conveyor belt drive motor; 10. Conveyor belt; 11. Material forward direction; 12. Material layer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Please see Figure 1 and 2 This utility model provides a technical solution: an expansion joint device for a cold air drying system. An expansion joint 1 is positioned above a drying device 2, and multiple expansion joints are connected sequentially. A motor M is fixed to the outer wall of the expansion joint 1. Inside the expansion joint 1, there is a steerable baffle 3, a partition 4, and a fixed baffle 7. The two ends of the partition 4 and the fixed baffle 7 are fixed to the inner wall of the expansion joint, and the root of the fixed baffle 7 is fixed to the inner wall of the expansion joint. A fixed baffle is installed every 30-70 cm, with the root of the fixed baffle 7 fixed to the partition 4. A fixed baffle 7 is installed at an angle of 30°~60° downwards to ensure that each fixed baffle 7 does not contact each other. The steerable baffle 3 is connected to the shaft 5, the partition 4, and the motor M through the shaft 5. The motor M drives the shaft 5 to rotate, and the angle of the steerable baffle 3 is adjusted to guide the gas into the expansion joint, thereby controlling the gas flow rate. The baffle 4 and the fixed baffle 7 form turbulence, which further blocks the dust particles carried in the airflow, improving the drying effect in the traditional process and the recycling problems and environmental problems caused by the large amount of dust escaping.

[0032] The number of expansion joints 1 can be determined based on the length of the drying device 2, with an installation spacing of 4-10 meters and 2-10 joints installed, used to compensate for gas expansion and control gas flow rate. The working angle of the steerable baffle 3 is between 0° and 90°. Several fixed baffles 7 can be installed.

[0033] Each expansion joint is equipped with a temperature monitoring device TI and a pressure monitoring device PI at its front end, and a temperature monitoring and control device TIC and a pressure monitoring and control device PIC at its rear end. The temperature monitoring device TI, pressure monitoring device PI, temperature monitoring and control device TIC, and pressure monitoring and control device PIC are connected to the motor M. Based on the temperature and pressure differences monitored between each expansion joint 1, the angle of the steerable baffle 3 is adjusted to regulate the gas flow rate and volume, thereby controlling the amount of dust in the gas.

[0034] Each expansion joint 1 is covered with an insulation layer between and on the outside of the expansion joints. The material's forward direction 11 in the cold air drying system is opposite to the blowing direction of the drying airflow or the airflow direction 6 in the expansion joints.

[0035] The drying device 2 consists of rollers 8, a conveyor belt drive motor 9, and a conveyor belt 10. The cold air outlet of the drying device 2 is under a slight negative pressure.

[0036] Example

[0037] Taking organosilicon micro powder as an example, the initial moisture content of the material is 10-50 wt%. The material is heated by a converter or kiln structure to evaporate the moisture and solvents and other volatile components in the material. The volatile components are then carried away by the opposing airflow to achieve the drying effect.

[0038] The upper part of the drying device is equipped with 5 expansion joints. During the drying process, when a small amount of dust enters the expansion joint along with the water vapor under the action of the drying airflow, the air pressure drops as the passage diameter suddenly increases. Then, the gas flow rate is slowed down by the obstruction of the baffle and fixed baffle. Due to the action of gravity, the dust will slowly fall down and return to the drying device. This not only avoids the waste of materials, but also prevents dust from causing pollution or safety hazards.

[0039] The direction of the powder material's movement is opposite to the direction of the purging airflow or the airflow in the expansion joint, forming a cross-flow effect. The evaporated moisture is discharged from the system under the drive of the cold airflow, and the dust carried in the airflow falls after being buffered by the expansion joint, resulting in a higher yield and greatly reducing the difficulty of post-processing collection.

[0040] Based on the material forward direction 11, each expansion joint 1 is equipped with a temperature monitoring device TI and a pressure monitoring device PI at its front end. A temperature difference limit is set according to the temperature difference data between the rear expansion joint and the front expansion joint along the material forward direction. When the temperature difference exceeds the limit, the direction of the baffle can be adjusted to tilt downward to slow down the airflow speed and the material forward speed. The function of the expansion joint is to alleviate the expansion of the airflow and balance the temperature, so that the dust carried by the airflow will slowly settle. Conversely, the corresponding adjustment is made.

[0041] Based on the material forward direction 11, each expansion joint 1 is equipped with a temperature monitoring and control device (TIC) and a pressure monitoring and control device (PIC) at its end. A pressure limit is set based on the pressure difference between the rear expansion joint and the front expansion joint along the material forward direction. When the pressure difference exceeds the limit, the direction of the baffle can be adjusted to tilt downwards to slow down the airflow speed and the material forward speed. The function of the expansion joint is to alleviate the expansion of the airflow and balance the air pressure, so that the dust carried by the airflow will slowly settle. Conversely, the corresponding adjustment is made.

[0042] To ensure a good drying effect, insulation layers are wrapped around each expansion joint and on the outside of each expansion joint.

[0043] Taking one batch of organosilicon micro powder as an example, the existing drying device is a tunnel furnace. The wet powder material with a moisture content of 36wt% is spread on the transmission belt. A total of 5 tons of wet powder material is fed in for heating and drying. The entire drying device is 50 meters long and has 10 expansion joint devices installed. The drying time is 12 hours, and 4990 kg of dried material is obtained. The moisture content is tested to be 0.4wt%.

[0044] Under the same process conditions, as a comparison, no expansion joint device was installed above the drying device, and the final dried material was 4950 kg with a moisture content of 4.8 wt%.

[0045] Analysis shows that the lost weight is organosilicon powder, which, through dispersion, causes environmental pollution and dust pollution. Dust collection is necessary. Installing an expansion joint device significantly reduces the moisture content of the material, minimizing material loss and ultimately yielding organosilicon powder with low moisture content, thus solving the dust dispersion problem.

[0046] In summary, the expansion joint device of the cold air drying system disclosed in this utility model, by setting several expansion joint devices above the drying device, allows a small amount of dust to enter the expansion joint along with water vapor under the action of the blowing airflow or vibration. As the diameter suddenly increases, the gas flow rate is slowed down, and the gas expansion is relieved. Due to the effect of gravity, the dust will slowly fall down and land on the drying device, reducing the difficulty of dust collection and reducing the operating load of the post-processing device.

[0047] The specific embodiments of this utility model are merely explanations of this patent and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but as long as they are within the scope of the claims of this patent, they are protected by patent law.

Claims

1. An expansion joint device for a cold air drying system, characterized by: An expansion joint (1) is positioned above the drying device (2). Multiple expansion joints are connected in sequence. A motor (M) is fixed to the outer wall of the expansion joint (1). Inside the expansion joint (1) are a steerable baffle (3), a partition (4), and a fixed baffle (7). The two ends of the partition (4) and the fixed baffle (7) are fixed to the inner wall of the expansion joint. The root of the fixed baffle (7) is fixed to the inner wall of the expansion joint. A fixed baffle is installed every 30-70 cm. The root of the fixed baffle (7) is fixed to the partition (4). A fixed baffle (7) is installed at intervals of 30~70cm, with an inclination angle of 30°~60° downwards to ensure that each fixed baffle (7) does not come into contact; the steerable baffle (3) is connected to the partition (4) and the motor (M) through the shaft (5), and the shaft (5) is driven to rotate by the motor (M) to adjust the angle of the steerable baffle (3) so as to guide the gas into the expansion joint, thereby controlling the gas flow rate, and forming turbulence through the partition (4) and the fixed baffle (7) to further block the dust particles carried in the airflow.

2. An expansion joint device for a cold air drying system as claimed in claim 1, characterized in that: The working angle of the steerable baffle (3) is between 0° and 90°; the fixed baffle (7) can be set in several units.

3. An expansion joint device for a cold air drying system as defined in claim 1, wherein: The number of expansion joints (1) can be determined according to the length of the drying device (2). The installation spacing is set at 4-10 meters, and 2-10 joints are set to compensate for gas expansion and control gas flow rate.

4. An expansion joint device for a cold flash drying system as claimed in claim 3, wherein: Each expansion joint (1) is provided with a temperature monitoring device (TI) and a pressure monitoring device (PI) at its front end and a temperature monitoring control device (TIC) and a pressure monitoring control device (PIC) at its end. The temperature monitoring device (TI), pressure monitoring device (PI), temperature monitoring control device (TIC), and pressure monitoring control device (PIC) are connected to the motor (M).

5. An expansion joint device for a cold flash drying system as claimed in claim 4, wherein: Based on the temperature and pressure difference data monitored between each expansion joint (1), the angle of the steerable baffle (3) is adjusted to regulate the gas flow rate and the gas flow rate entering the expansion joint, thereby controlling the amount of dust in the gas.

6. An expansion joint device for a cold flash drying system as defined in claim 3, wherein: Each expansion joint (1) is covered with an insulation layer between and on the outside of the expansion joint (1).

7. An expansion joint device for a cold flash drying system as defined in claim 1, wherein: The material's forward direction (11) in the cold air drying system is opposite to the blowing direction of the drying airflow or the airflow direction (6) in the expansion joint.

8. The expansion joint apparatus of claim 1, wherein: The drying device (2) consists of rollers (8), a conveyor belt drive motor (9), and a conveyor belt (10).

9. The expansion joint device for a cold air drying system according to claim 8, characterized in that: The cold air outlet of the drying device (2) is under slight negative pressure.

Images