Hot air auxiliary powder drying device

Abstract

The utility model discloses a hot air assisted powder drying device which comprises a nitrogen source, a pipeline heater, a heat preservation gas storage tank and a powder drying kettle, an exhaust filter is arranged on the powder drying kettle, an annular nitrogen charging device is arranged at the bottom of the powder drying kettle, the nitrogen source is connected with the pipeline heater, the pipeline heater is connected with the heat preservation gas storage tank, and the heat preservation gas storage tank is connected with the annular nitrogen charging device. The heat preservation gas storage tank is connected with the annular nitrogen charging device and a reverse blowing opening of the exhaust filter, an electromagnetic pneumatic valve set is installed at the nitrogen charging opening of the annular nitrogen charging device, and a pulse electromagnetic valve is installed at the reverse blowing opening of the exhaust filter. According to the powder drying kettle, the temperature in the kettle body can be prevented from being reduced due to a nitrogen replacement step in the powder drying process, so that the drying efficiency is improved, and the supply of qualified dehydrated powder is ensured.

Description

Technical Field

[0001] This application relates to the field of powder drying equipment technology, and in particular to a hot air-assisted powder drying equipment. Background Technology

[0002] Currently, most raw material powders used in the production of traditional two-component polyurethane adhesives in China require pre-treatment for drying and dehydration to achieve the required moisture content. However, the drying efficiency cannot keep up with the efficiency of the subsequent adhesive production, mainly due to the characteristics of the powder and the drying process. Existing powder drying and dehydration processes generally involve heating the powder in a drying mixing vessel until the target temperature is reached, then vacuuming to remove evaporated water vapor and supplementing with a small amount of low-temperature nitrogen to assist in the separation of powder and moisture. However, supplementing with low-temperature drying nitrogen lowers the powder temperature, thus affecting the drying efficiency. Therefore, this invention proposes a hot air-assisted powder drying device. Utility Model Content

[0003] This application provides a hot air-assisted powder drying device, which prevents the temperature inside the reactor from dropping due to the nitrogen replacement step during the powder drying process, thereby improving drying efficiency and ensuring the supply of qualified dehydrated powder.

[0004] In view of this, this application provides a hot air-assisted powder drying device, including: a nitrogen source, a pipeline heater, an insulated gas storage tank, and a powder drying kettle;

[0005] The powder drying kettle is equipped with an exhaust filter;

[0006] The bottom of the powder drying kettle is equipped with an annular nitrogen filling device;

[0007] The nitrogen source is connected to the pipeline heater;

[0008] The pipeline heater is connected to the insulated gas storage tank;

[0009] The insulated gas storage tank is connected to the annular nitrogen filling device;

[0010] An electromagnetic pneumatic valve assembly is installed at the nitrogen filling port of the annular nitrogen filling device.

[0011] Optionally, the nitrogen source is connected to the pipeline heater via a lead pipe.

[0012] Optionally, the pipe heater is connected to the insulated gas storage tank via a first pipe;

[0013] The insulated gas storage tank is connected to the annular nitrogen filling device via a second pipe.

[0014] Optionally, the outer surfaces of the first pipe, the second pipe, and the insulated gas storage tank are all provided with an insulation layer.

[0015] Optionally, the insulated gas storage tank is connected to the backflush port of the exhaust filter via a third pipe;

[0016] The exhaust filter is equipped with a pulse solenoid valve at its backflush port for performing timed nitrogen pulse backflush into the powder drying kettle.

[0017] Optionally, the outer surface of the third pipe is provided with a heat insulation layer.

[0018] Optionally, the insulation layer is made of rock wool.

[0019] Optionally, it may also include: a control device;

[0020] The control device is electrically connected to the pulse solenoid valve and the electromagnetic pneumatic valve group, respectively.

[0021] Optionally, the control device is a PLC.

[0022] Optionally, the electromagnetic pneumatic valve assembly consists of a solenoid valve and a pneumatic valve.

[0023] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This hot air-assisted powder drying device pre-treats the nitrogen gas to be replaced in the powder drying kettle by heating it, and at the same time adds an insulated gas storage tank placed after the pipeline heater to store the heated nitrogen gas. Then, the nitrogen gas is replenished in a pulse form through the electromagnetic pneumatic valve group installed at the nitrogen filling port of the annular nitrogen filling device. By replenishing the heated nitrogen gas, the temperature inside the kettle can be kept from decreasing due to the nitrogen replacement step in the powder drying process, thereby improving the drying efficiency and ensuring the supply of qualified dehydrated powder. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the hot air-assisted powder drying device in the embodiments of this application;

[0025] The attached figures are labeled as follows:

[0026] 1-Powder drying kettle, 2-Pipeline heater, 3-Insulated gas storage tank, 4-Annular nitrogen filling device, 5-Exhaust filter, 6-Electromagnetic pneumatic valve group, 7-Inlet pipe, 8-First pipeline, 9-Second pipeline, 10-Third pipeline. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] This application provides an embodiment of a hot air-assisted powder drying device. Please refer to the following for details. Figure 1 .

[0031] The hot air-assisted powder drying device in this embodiment includes: a nitrogen source, a pipeline heater 2, an insulated gas storage tank 3, and a powder drying kettle 1. An exhaust filter 5 is installed on the powder drying kettle 1, and an annular nitrogen filling device 4 is installed at the bottom of the powder drying kettle 1. The nitrogen source is connected to the pipeline heater 2, the pipeline heater 2 is connected to the insulated gas storage tank 3, the insulated gas storage tank 3 is connected to the annular nitrogen filling device 4, and an electromagnetic pneumatic valve group 6 is installed at the nitrogen filling port of the annular nitrogen filling device 4.

[0032] It should be noted that this hot air-assisted powder drying device pre-treats the nitrogen gas to be filled into the powder drying kettle 1 by heating it. At the same time, an insulated gas storage tank 3 is placed after the pipeline heater 2 to store the heated nitrogen gas. Then, the nitrogen gas is replenished in a pulse manner through the electromagnetic pneumatic valve group 6 installed at the nitrogen filling port of the annular nitrogen filling device 4. By replenishing the heated nitrogen gas, the temperature inside the kettle can be maintained so that it does not drop due to the nitrogen replacement step in the powder drying process, thereby improving the drying efficiency and ensuring the supply of qualified dehydrated powder.

[0033] The above is Embodiment 1 of a hot air-assisted powder drying device provided in this application. The following is Embodiment 2 of a hot air-assisted powder drying device provided in this application. Please refer to the following for details. Figure 1 .

[0034] The hot air-assisted powder drying device in this embodiment includes: a nitrogen source, a pipeline heater 2, an insulated gas storage tank 3, and a powder drying kettle 1. An exhaust filter 5 is installed on the powder drying kettle 1, and an annular nitrogen filling device 4 is installed at the bottom of the powder drying kettle 1. The nitrogen source is connected to the pipeline heater 2, the pipeline heater 2 is connected to the insulated gas storage tank 3, and the insulated gas storage tank 3 is connected to the annular nitrogen filling device 4. An electromagnetic pneumatic valve assembly 6 is installed at the nitrogen filling port of the annular nitrogen filling device 4. Specifically, the volume of the insulated gas storage tank 3 can be 1 m³, and a certain amount of hot nitrogen can be stored in the 1 m³ insulated gas storage tank 3.

[0035] Understandably, this device uses pulsed nitrogen replenishment, which has the following advantages compared to the traditional continuous, weak nitrogen replenishment method: 1. In terms of improving nitrogen filling efficiency, pulsed nitrogen replenishment can release a large flow of nitrogen in a short time, quickly increasing the nitrogen concentration in the drying kettle, while continuous, weak replenishment takes longer to achieve the same concentration; 2. From the perspective of uniformity, pulsed nitrogen filling utilizes instantaneous airflow impact to make nitrogen diffuse more evenly in the drying kettle, while continuous, weak replenishment is prone to causing local concentration differences; 3. In terms of energy saving and consumption reduction, pulsed nitrogen filling can precisely control the filling time and amount according to process requirements, avoiding energy waste caused by continuous nitrogen filling; 4. Pulsed nitrogen filling can flexibly adjust parameters according to different powder characteristics and drying stages, while continuous nitrogen filling lacks flexibility.

[0036] The nitrogen source is connected to the pipeline heater 2 via pipe 7. Specifically, the nitrogen source is the existing nitrogen main pipe in the workshop; the pipeline heater 2 can be set with upper and lower limits for the heating temperature range.

[0037] The pipeline heater 2 is connected to the insulated gas storage tank 3 through the first pipeline 8, and the insulated gas storage tank 3 is connected to the annular nitrogen filling device 4 through the second pipeline 9.

[0038] The outer surfaces of the first pipe 8, the second pipe 9, and the insulated gas storage tank 3 are all provided with an insulation layer.

[0039] The insulated gas storage tank 3 is connected to the backflush port of the exhaust filter 5 through the third pipe 10; the backflush port of the exhaust filter 5 is equipped with a pulse solenoid valve for performing timed nitrogen pulse backflush into the powder drying kettle 1.

[0040] It should be noted that during the vacuum dehydration process, the exhaust filter 5 can be backflushed at regular intervals via a pulse solenoid valve to prevent powder from clinging to the filter element and affecting the air permeability.

[0041] The outer surface of the third pipe 10 is provided with an insulation layer. Specifically, the insulation layer can be made of rock wool, and the thickness of the insulation layer can be 30mm.

[0042] It should be noted that by insulating all equipment pipelines after nitrogen heating, excessive heat loss can be effectively prevented.

[0043] It also includes a control device, which is electrically connected to the pulse solenoid valve and the solenoid pneumatic valve group 6 respectively. Specifically, the control device can be a PLC, which uses a PLC program to interlock the timed start of the high vacuum dehydration process and the number of start-stop cycles for each start.

[0044] The electromagnetic pneumatic valve assembly 6 consists of a solenoid valve and a pneumatic valve. Specifically, the solenoid valve can be tightly connected to the pneumatic actuator of the pneumatic valve via a flange connection or a threaded connection to ensure efficient signal transmission and action execution. When the electromagnetic control part of the solenoid valve receives an external signal, it drives the pneumatic actuator of the pneumatic valve to achieve precise control of the nitrogen filling port.

[0045] In practice, nitrogen from the nitrogen source enters the pipeline heater 2 through the inlet pipe 7 for heating, and then enters the insulated gas storage tank 3 through the first pipeline 8 for temporary storage and buffering. The entire high-temperature dehydration process requires the use of the annular nitrogen filling device 4 at the bottom of the powder drying kettle 1 to assist in heating the kettle body. The water vapor evaporated is drawn away by the vacuum source through the exhaust filter 5. By supplementing the heated nitrogen, the temperature inside the kettle body can be kept from decreasing due to the nitrogen replacement step in the powder drying process, thereby improving the drying efficiency and ensuring the supply of qualified dehydrated powder. In addition, the long-term vacuum negative pressure will carry a small amount of powder to adhere to the filter element of the exhaust filter 5. Therefore, it is necessary to close the vacuum pneumatic valve at regular intervals and then use the pulse solenoid valve to backflush several times to clean the powder adhering to the filter element.

[0046] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A hot air assisted powder drying apparatus, characterized by, The application relates to a nitrogen source, a pipeline heater, a heat-insulating gas storage tank and a powder drying kettle. An exhaust filter is arranged on the powder drying kettle. An annular nitrogen charging device is arranged at the bottom of the powder drying kettle. The nitrogen source is connected with the pipeline heater. The pipeline heater is connected with the heat-insulating gas storage tank. The heat-insulating gas storage tank is connected with the annular nitrogen charging device. An electromagnetic pneumatic valve group is arranged at a nitrogen charging port of the annular nitrogen charging device. The nitrogen source is connected with the pipeline heater through a lead pipe.

2. The hot air auxiliary powder drying apparatus according to claim 1, wherein The pipeline heater is connected with the heat-insulating gas storage tank through a first pipeline.

3. The hot air auxiliary powder drying apparatus according to claim 1, wherein The heat-insulating gas storage tank is connected with the annular nitrogen charging device through a second pipeline. The first pipeline, the second pipeline and the heat-insulating gas storage tank are all provided with heat-insulating layers.

4. The hot-air auxiliary powder drying apparatus according to claim 3, wherein The heat-insulating gas storage tank is connected with a back-blowing port of the exhaust filter through a third pipeline.

5. The hot-air auxiliary powder drying apparatus according to claim 1, wherein A pulse electromagnetic valve for realizing nitrogen pulse back-blowing into the powder drying kettle is arranged at the back-blowing port of the exhaust filter. The third pipeline is provided with a heat-insulating layer.

6. The hot-air auxiliary powder drying apparatus according to claim 5, wherein The heat-insulating layer is made of rock wool.

7. The hot air assisted powder drying apparatus according to claim 4 or 6, wherein The application further relates to a control device.

8. The hot air auxiliary powder drying apparatus according to claim 5, wherein The control device is electrically connected with the pulse electromagnetic valve and the electromagnetic pneumatic valve group. The control device is a PLC. The electromagnetic pneumatic valve group is composed of an electromagnetic valve and a pneumatic valve.

9. The hot-air auxiliary powder drying apparatus according to claim 8, wherein ​ 10. The hot-air auxiliary powder drying apparatus according to claim 1, wherein ​

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