Multi-pass pneumatic dryer

Abstract

The utility model provides a kind of multi-channel airflow drying machine, including rack and the heating furnace, pressure balance cavity, gas valve and sample bin being installed relying on the rack;The airflow outlet of the heating furnace is communicated with the gas inlet of pressure balance cavity, for the heated airflow is introduced into pressure balance cavity;Several gas outlets are opened on the pressure balance cavity, and each gas outlet is communicated with a sample bin by gas valve. The multi-channel airflow drying machine has the advantages of being able to ensure that the temperature and flow consistency of drying airflow is strong, and the drying parameter control ability is excellent.

Description

Technical Field

[0001] This utility model relates to the field of tobacco experimental technology, specifically to a multi-channel airflow dryer. Background Technology

[0002] Near-infrared spectroscopy is a rapid, efficient, and non-destructive analytical technique widely used in the tobacco industry for chemical composition analysis of tobacco leaves, quality evaluation of tobacco leaves, blending of tobacco processing modules, control of the uniformity of re-dried tobacco quality, quality control of cigarette raw materials and auxiliary materials, and cigarette formulation maintenance and design. However, because near-infrared spectroscopy extracts useful spectral information from a complex spectral background, its analytical results are highly susceptible to influences from various factors such as sample condition and moisture content, leading to errors. Therefore, when performing near-infrared analysis on the chemical components of tobacco, it is crucial to minimize and control these influencing factors.

[0003] Because water molecules containing hydroxyl bonds exhibit strong spectral absorption in the near-infrared band, they alter the shape of the near-infrared spectrum of a sample. Therefore, uneven moisture content in tobacco samples can significantly affect near-infrared spectra. If the moisture content range in the tobacco sample being tested differs from that in the calibration set, it will greatly impact the prediction results. Furthermore, excessive moisture can also affect the grinding process of tobacco samples, causing uneven sample particles and agglomeration, which in turn affects near-infrared absorption. Therefore, controlling the moisture content of tobacco leaves is particularly important for near-infrared analysis.

[0004] To reduce the moisture content of tobacco leaves and improve grinding efficiency, the leaves are usually baked at low temperatures or air-dried naturally to achieve the required moisture content.

[0005] However, low-temperature baking can easily lead to the loss of low-boiling-point components in tobacco leaves, which may affect the results of near-infrared analysis. Natural sun-drying, on the other hand, is greatly affected by weather temperature and humidity, resulting in lower drying efficiency and poorer moisture control.

[0006] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-channel airflow dryer that can ensure strong consistency in temperature and flow rate of the drying airflow and excellent control over drying parameters.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a multi-channel airflow dryer, including a frame and a heating furnace, a pressure balancing chamber, an air valve, and a sample chamber, all mounted on the frame;

[0009] The gas outlet of the heating furnace is connected to the gas inlet of the pressure balance chamber, which is used to introduce the heated gas flow into the pressure balance chamber.

[0010] The pressure balancing chamber has several gas outlets, and each gas outlet is connected to a sample chamber via a gas valve.

[0011] Based on the above, the pressure balancing chamber is a box-type balancing chamber mounted on the frame, and the gas outlet array is distributed on the upper surface of the box-type balancing chamber.

[0012] Based on the above, the box-type balancing cavity is a flat cubic shape.

[0013] Based on the above, the air valve is a flow regulating valve, and the flow regulating valve is controlled manually or electromagnetically.

[0014] Based on the above, the sample chamber includes a base and a cylindrical body. The frame is provided with an installation groove corresponding to the base, the base sits in the installation groove, the cylindrical body is fitted on the base, and the base is provided with an interface for connecting a gas tube and a gas passage.

[0015] Based on the above, the inner wall of the pressure balancing chamber is made of heat-insulating material.

[0016] As described above, a pressure controller is installed on the pipeline between the heating furnace and the pressure balance chamber.

[0017] Based on the above, the gas inlet of the pressure balancing chamber is located at the center of the bottom of the pressure balancing chamber. A flow equalization plate is provided in the pressure balancing chamber to evenly distribute the gas flow entering through the gas inlet to different areas of the pressure balancing chamber, ensuring that the gas temperature and pressure remain consistent throughout the chamber.

[0018] Based on the above, the heating furnace is a furnace body equipped with a power pump.

[0019] Based on the above, the frame is equipped with an electrical control cabinet for controlling the gas valve, heating furnace and pressure controller.

[0020] The temperature in the pressure balancing chamber is 50-55°C, and the pressure is 0.2-0.5 MPa.

[0021] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model has the following advantages:

[0022] 1. The airflow is heated by a heating furnace, and the heated airflow is buffered in a large container using a pressure balancing chamber. After the airflow is dispersed and stabilized in the container, a relay air source with uniform temperature and stable air pressure is formed. Then, a multi-channel airflow drying path is formed through a multi-channel set of air valves and sample chambers. In this control mode, whether a single air valve is opened or multiple air valves are opened, the airflow pressure and flow rate in each sample chamber can be kept relatively constant, so that the final tobacco leaves or tobacco flakes are dried to a similar degree, which is beneficial to the accuracy of near-infrared spectroscopy detection and analysis.

[0023] 2. The gas valve is designed as a flow regulating valve. During the experiment, the flow rate can be controlled by adjusting the opening of the flow regulating valve to ensure that the temperature and flow rate of the gas flow introduced into different sample chambers are the same.

[0024] 3. A pressure controller is installed to dynamically replenish the pressure balance chamber with hot air, thereby keeping the pressure in the pressure balance chamber in a relatively stable state to ensure the consistency and stability of flow rate and temperature in each sample chamber. Attached Figure Description

[0025] Figure 1 This is one of the structural schematic diagrams of the multi-channel airflow dryer in this utility model.

[0026] Figure 2 This is the second schematic diagram of the multi-channel airflow dryer in this utility model.

[0027] Figure 3 This is a schematic diagram of the sample chamber structure in this utility model.

[0028] In the diagram: 1. Frame; 2. Heating furnace; 3. Pressure balance chamber; 4. Gas valve; 5. Sample chamber; 6. Electrical control cabinet; 7. Pressure controller; 51. Base; 52. Cylinder; 53. Interface. Detailed Implementation

[0029] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0030] Example 1

[0031] like Figures 1-3 As shown, a multi-channel airflow dryer includes a frame 1 and a heating furnace 2, a pressure balancing chamber 3, an air valve 4, a sample chamber 5, and an electrical control cabinet 6, all mounted on the frame 1.

[0032] The gas outlet of the heating furnace 2 is connected to the gas inlet of the pressure balance chamber 3 through a pipe, which is used to introduce the heated gas flow into the pressure balance chamber 3. In this embodiment, the heating furnace 2 is a vertical pipe heating furnace with a power of 3 kW, which can heat the incoming air at a relatively fast speed. The air pump can be integrated into the heating furnace 2, or it can be set at the upstream gas source or the downstream outlet side.

[0033] The pressure balance chamber 3 has several gas outlets, and each gas outlet is connected to a sample chamber 5 through a gas valve 4.

[0034] Specifically, in this embodiment, the pressure balancing chamber 3 is a box-type balancing chamber set on the frame 1, specifically in the shape of a flat cube. The gas outlet array is distributed on the upper surface of the box-type balancing chamber, and the gas inlet of the pressure balancing chamber 3 is set in the central area of ​​the bottom of the pressure balancing chamber 3. The purpose is to allow the incoming airflow to be evenly dispersed in the pressure balancing chamber 3, thereby achieving the purpose of collecting and distributing gas.

[0035] To meet the requirements of pressure and heat preservation, the pressure balancing chamber 3 is a closed chamber except for the gas inlet and gas outlet. The inner wall material of the chamber is all heat-insulating material to prevent heat loss.

[0036] In some embodiments, the gas valve is a simple two-way valve that only performs the open and close control options. In this mode, the gas flow rate of each sample chamber does not need to be adjusted.

[0037] In other embodiments, the gas valve is a flow regulating valve, which is controlled manually or electromagnetically. The accuracy of gas flow regulation in each sample chamber can be improved through flow control.

[0038] In this embodiment, the sample chamber 5 includes a base 51 and a cylindrical body 52. ​​The frame 1 is provided with an installation groove corresponding to the base 51. The base 51 sits in the installation groove. The cylindrical body 52 is fitted on the base 51. The base 51 is provided with an interface 53 for connecting an air pipe and an air passage. The air passage communicates with the interior of the cylindrical body 52.

[0039] During sample drying, the same weight of sample is added to different sample chambers 5 for drying. The specific number of sample chambers used can be determined according to the number of samples to be dried.

[0040] To facilitate pressure control, a pressure controller 7 is installed on the pipe between the heating furnace 2 and the pressure balance chamber 3 to control the pressure in the pressure balance chamber 3 to remain constant.

[0041] Brief description of the work process:

[0042] Before the experiment begins, preheating is performed with all valves open and the furnace activated. Compressed air is introduced to heat all parts of the dryer. After a period of time, all valves are closed, and the pressure balance chamber is maintained at the set pressure value. This creates a positive pressure relative to each sample chamber 5 and the outside environment, ensuring that the drying gas is evenly distributed and stabilized within the pressure balance chamber. This maintains a relatively consistent temperature at each location within the chamber. The presence of the pressure balance chamber acts as a relay for the heat source, transforming it into a larger, temporary, stable gas source. This ensures a balanced pressure distribution across all channels during multi-channel output, ultimately maintaining a consistent temperature and flow rate for the output drying gas.

[0043] According to the experimental requirements, select the required number of sample chambers, pre-adjust the opening of the flow control valve of each sample chamber to ensure that the airflow speed and temperature of multiple sample chambers are kept the same. After drying for a set time, take out the sample and perform various tests such as cutting, grinding, and near-infrared spectroscopy analysis.

[0044] During the drying process, as the gas source pressure in the pressure balance chamber is lost, a new hot gas flow is input through the pressure controller to replenish the gas in the pressure balance chamber and stabilize the pressure. The flow equalization plate can guide the newly input hot gas flow to various positions in the pressure balance chamber in a relatively dispersed manner, thereby controlling the pressure in the pressure balance chamber within a set range. This ensures the consistency and stability of gas flow and temperature in one or more sample chambers.

[0045] Example 2

[0046] A method of using a multi-channel airflow dryer:

[0047] Step 1) Start the heating furnace, open the gas valves of each sample chamber, control the heating parameters of the heating furnace, and preheat the entire multi-channel airflow dryer;

[0048] Step 2) Close all gas valves and increase the pressure balance chamber. The pressure balance chamber stores constant-pressure gas with temperature to form a stable gas source.

[0049] Step 3) Place the samples into different sample chambers in equal portions, and control the opening of the air valve in each sample chamber to be at the same opening.

[0050] Step 4) The airflow in the pressure balance chamber enters the sample chamber through the opened air valve to continuously dry the sample in the sample chamber at a constant temperature and flow rate.

[0051] The pressure controller installed on the pipeline between the heating furnace and the pressure balance chamber is used to monitor the pressure value of the pressure balance chamber and dynamically switch it on and off to allow the heating furnace to replenish the pressure balance chamber with gas to compensate for pressure loss.

[0052] The temperature in the pressure balancing chamber is 50-55°C, and the pressure is 0.2-0.5 MPa.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A multi-channel airflow dryer, characterized in that: It includes a frame and a heating furnace, a pressure balancing chamber, a gas valve, and a sample chamber, all mounted on the frame; The gas outlet of the heating furnace is connected to the gas inlet of the pressure balance chamber, which is used to introduce the heated gas flow into the pressure balance chamber. The pressure balancing chamber has several gas outlets, and each gas outlet is connected to a sample chamber via a gas valve.

2. The multi-channel airflow dryer according to claim 1, characterized in that: The pressure balancing chamber is a box-type balancing chamber mounted on the frame, and the gas outlet array is distributed on the upper surface of the box-type balancing chamber.

3. The multi-channel airflow dryer according to claim 2, characterized in that: The box-type balancing chamber is a flat cubic shape; the inner wall of the pressure balancing chamber is made of heat-insulating material.

4. The multi-channel airflow dryer according to claim 1 or 2, characterized in that: The air valve is a flow regulating valve, and the flow regulating valve can be controlled manually or electromagnetically.

5. The multi-channel airflow dryer according to claim 1, 2, or 3, characterized in that: The sample chamber includes a base and a cylindrical body. The frame is provided with a mounting groove corresponding to the base, and the base sits in the mounting groove. The cylindrical body is fitted onto the base. The base is provided with an interface for connecting a gas tube and a gas passage.

6. The multi-channel airflow dryer according to claim 1, characterized in that: The gas inlet of the pressure balance chamber is located at the center of the bottom of the pressure balance chamber.

7. The multi-channel airflow dryer according to claim 6, characterized in that: The pressure balancing chamber is equipped with a flow equalization plate, which is used to evenly distribute the gas flow entering from the gas inlet to different areas of the pressure balancing chamber, so that the gas temperature and pressure in all parts of the pressure balancing chamber remain consistent.

8. The multi-channel airflow dryer according to claim 1, 2, 3, or 6, characterized in that: A pressure controller is installed on the pipe between the heating furnace and the pressure balance chamber.

9. The multi-channel airflow dryer according to claim 1, 2, 3, or 6, characterized in that: The heating furnace is a furnace body equipped with a power pump.

10. The multi-channel airflow dryer according to claim 7, characterized in that: The frame is equipped with an electrical control cabinet for controlling the gas valve, heating furnace, and pressure controller.

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