Radiation drying device based on absorption spectrum of drying target and design method thereof

Abstract

The invention discloses a radiation drying device based on a drying target absorption spectrum and a design method thereof. The device comprises a radiation source, a box body and a power supply, the radiation source is used for generating radiation, the box body comprises a back plate, side plates and a support, and the side plates are provided with air guide holes; the support is used for fixing the radiation source. The power supply is used for supplying power to the radiation sources and controlling on-off of the single radiation source. The design method comprises the following steps: selecting a proper radiation source according to an absorption spectrum of a drying target; calculating the required radiation source power and quantity according to the required radiation power density, the required radiation area and the reflectivity of the existing reflecting plate; designing a box body according to the radiation area and the side length of the radiation target surface; a radiation source arrangement mode is designed, and the radiation intensity is changed by controlling on-off of radiation sources through a power supply. According to the invention, accurate drying of a drying target and radiation distribution with the uniformity greater than 90% and the radiation power density greater than 20W / cm < 2 > under a large-size target can be realized, the energy consumption is reduced, and the drying efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of drying equipment technology, and in particular to a radiation drying device based on the absorption spectrum of the drying target and its design method. Background Technology

[0002] A drying device is a piece of equipment used for drying operations. It uses heat to vaporize and remove moisture (generally water or other volatile liquid components) from materials, thereby obtaining solid materials with a specified moisture content. The purpose of drying is to meet the needs of material use or further processing. Because natural drying is far from meeting the needs of production development, various mechanized dryers are being used more and more widely.

[0003] Patent CN102889764A discloses an infrared dryer. The dryer's outer shell has an air inlet / outlet, a wet material inlet, and a dry material outlet. A conveyor is installed inside the shell, and a radiator is located at the top of the shell. This dryer uses a belt conveyor to transport materials, which are dried by the top-mounted infrared radiator during transport. However, precise temperature control is not possible, and the drying process suffers from uneven heating and inconsistent drying levels.

[0004] Patent CN109959232A discloses an infrared rapid drying oven. The oven's outer casing contains a heating chamber separated by an integrally installed partition. The partition and the outer casing are spaced apart. Multiple infrared light tubes are installed parallel to each other on the inner side of the partition within the heating chamber. Multiple air ducts are evenly spaced within the partition above and below the infrared light tubes. An exhaust fan is installed at a position corresponding to each air duct at the lower end of the outer casing. The exhaust fan is integrally connected to an air duct, the other end of which extends to the outside of the outer casing. This invention uses infrared light tubes within the heating chamber for drying and exhaust fans and exhaust fans for temperature control. However, the temperature within the heating chamber is difficult to control precisely, and energy efficiency is low. Summary of the Invention

[0005] The purpose of this invention is to provide a drying device and its design method that features precise temperature control, uniform drying, energy efficiency, and high performance.

[0006] The technical solution to achieve the purpose of this invention is: a radiation drying device based on the absorption spectrum of the drying target, comprising a radiation source, a housing, and a power supply;

[0007] The radiation source is used to generate radiation; the type, number, and arrangement of the radiation sources are determined based on the absorption spectrum of the drying target, the required radiation power density, and the radiation area.

[0008] The enclosure includes a back panel, side panels, and a support frame. The back panel and side panels are used to reflect radiation. The side panels are provided with air vents to discharge the dried steam. The support frame is used to fix the radiation source. The dimensions of the enclosure are determined based on the radiation area and the side length of the radiation target surface.

[0009] The power supply is used to provide the required voltage and current to the radiation sources and to control the switching of individual radiation sources.

[0010] A design method for a radiation drying apparatus based on the absorption spectrum of the drying target, as described above, includes the following steps:

[0011] Step 1: Select a radiation source based on the absorption spectrum of the target to be dried;

[0012] Step 2: Calculate the power and number of radiation sources based on the required radiation power density, target area, and reflectivity of existing reflectors;

[0013] Step 3: Design the dimensions of the housing based on the side length of the radiation target surface;

[0014] Step 4: Determine the arrangement of the radiation sources and change the radiation intensity by controlling the switching of the radiation sources with the power supply.

[0015] Compared with the prior art, the present invention has the following significant advantages: (1) According to the absorption spectrum of the drying target, the required radiation power density and radiation area, the radiation source type, arrangement and box index are designed to achieve precise drying of the drying target; (2) The radiation source adopts a uniform light design, which can achieve uniform radiation distribution; (3) The radiation drying method is adopted, the radiation can penetrate the object to be dried, and each layer is heated simultaneously, which improves the evaporation efficiency; (4) The radiation source has high radiation energy conversion efficiency, which reduces energy consumption and improves drying efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the radiation drying device based on the absorption spectrum of the drying target according to the present invention.

[0017] Figure 2 This is a schematic flowchart illustrating the design method of the radiation drying device based on the absorption spectrum of the drying target according to the present invention.

[0018] Figure 3 For a large target size of 10cm×25cm, the uniformity is greater than 90% and the power density is greater than 20W / cm². 2 Radiation distribution map.

[0019] Figure 4 For a reflectivity of 70%, the target surface uniformity should be greater than 90%, and the power density should be greater than 17 W / cm². 2 Radiation distribution map.

[0020] Figure 5 For a reflectivity of 70%, the target surface uniformity should be greater than 90%, and the power density should be greater than 15 W / cm². 2 Radiation distribution map. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this invention, those skilled in the art can conceive of various embodiments of this invention without altering its essential spirit. Therefore, the following specific embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of this invention or as limitations or restrictions on its technical solution.

[0022] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0023] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0024] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0025] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0026] The present invention provides a radiation drying device based on the absorption spectrum of the drying target, characterized in that it includes a radiation source 11, a housing 12 and a power supply 13;

[0027] The radiation source 11 is used to generate radiation; the type, number and arrangement of the radiation sources 11 are determined according to the absorption spectrum of the drying target, the required radiation power density and the radiation area.

[0028] The housing 12 includes a back plate 121, a side plate 123, and a support 122. The back plate 121 and the side plate 123 are used to reflect radiation. The side plate 123 is provided with a vent 141 for discharging the dried steam. The support 122 is used to fix the radiation source 11. The dimensions of the housing 12 are determined based on the radiation area and the side length of the radiation target surface.

[0029] The power supply is used to provide the required voltage and current to the radiation sources and to control the switching of individual radiation sources.

[0030] As a specific example, the radiation source 11 is used to generate infrared radiation.

[0031] As a specific example, an air duct is provided on the outside of the air guide hole 141. The dried steam leaves the box 12 along the air duct. An exhaust fan is installed in the air duct to provide power for exhaust.

[0032] As a specific example, the housing 12 includes an inner housing and an outer housing, which are connected by a heat insulation board for heat insulation between the inner and outer housings.

[0033] As a specific example, the outer casing is provided with a heat dissipation and cooling device for dissipating heat from the casing 12; the heat dissipation and cooling device is a finned heat sink, a cooling fan, or a water-cooled heat dissipation device.

[0034] The present invention also provides a design method for a radiation drying apparatus based on the absorption spectrum of the drying target as described above, characterized by comprising the following steps:

[0035] Step 1: Select radiation source 11 for radiation based on the absorption spectrum of the drying target;

[0036] Step 2: Calculate the power and number of radiation sources 11 based on the required radiation power density, target area, and reflectivity of the existing reflector.

[0037] Step 3: Design the dimensions of box 12 according to the side length of the radiation target surface;

[0038] Step 4: Determine the arrangement of radiation sources 11, and change the radiation intensity by controlling the switch of radiation sources 11 through power supply 13.

[0039] As a specific example, step 1, which involves selecting radiation source 11 based on the absorption spectrum of the drying target, is detailed as follows:

[0040] Based on the absorption spectrum of the drying target, select the type of radiation source 11 for radiation;

[0041] If a radiation source 11 with multiple emission peaks is used, the voltage or current of the radiation source 11 can be adjusted by the power supply 13 to change the working state of the radiation source 11, thereby changing the emission peaks of the radiation source 11.

[0042] As a specific example, step 2, which involves calculating the power and number of radiation sources 11 based on the required radiation power density and target area, is as follows:

[0043] According to the required radiation power density Radiation area Given the reflectivity r of the existing reflector, calculate the required power and number of radiation sources 11 using the following formula:

[0044]

[0045]

[0046] in, Indicates radiation energy density, Indicates radiation time. This represents the power of a single radiation source 11. This indicates the number of radiation sources 11.

[0047] As a specific example, the design of the dimensions of the box 12 based on the side length of the radiation target surface in step 3 is as follows:

[0048] The outlet area of ​​the housing 12 is designed to be more than 1.5 times the target area, or, when the target is square, the housing 12 is a cuboid with an outlet side length more than 1.2 times the side length of the radiation target; when the target is circular, the housing 12 is a cylinder with an outlet radius more than 1.2 times the radius of the radiation target.

[0049] The height of the box (12) is 0.5-2 times the length or diameter of the outlet side.

[0050] For example, taking a square shape as an example, if the target surface to be irradiated is 10cm×10cm, the box should be designed as a cuboid. The exit area should be more than 1.5 times the target surface or more than 1.2 times the side length, that is, it should be more than 12.5cm×12.5cm. The height of the box should be 0.5-2 times the length or diameter of the exit, that is, it should be 6.25-25cm.

[0051] As a specific example, step 4, which involves determining the arrangement of radiation sources 11, uses power supply 13 to control the switching of radiation sources 11 to change the radiation intensity, as follows:

[0052] Based on the uniform light design requirements of the drying device, the radiation source 11 is designed to be arranged in a centrally symmetrical manner.

[0053] The radiation intensity is changed by controlling the switch of the radiation source 11 through the power supply 13. The requirements for controlling the radiation source 11 are symmetrical control and interval control. Symmetrical control means that the switch controls two radiation sources 11 that are symmetrically located inside the box 12 at the same time. Interval control means that the switch controls the radiation source in a way that is spaced apart from the radiation source 11 that was previously controlled, and always retains the central radiation source.

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Example 1

[0056] Combination Figure 1This embodiment provides a radiation drying device based on the absorption spectrum of the drying target, including a radiation source 11, a housing 12 and a power supply 13;

[0057] The radiation source 11 is used to generate infrared radiation;

[0058] The housing 12 includes a back plate 121, a side plate 123, and a bracket 122. The back plate 121 and the side plate 123 are polished or coated to enhance reflection, which is used to reflect radiation, improve drying efficiency, and save energy. The side plate 123 is provided with a vent 141 to discharge the dried steam. The bracket 122 is used to fix the radiation source.

[0059] The power supply 13 is used to provide the required voltage and current to the radiation source 11 and to control the switching of the individual radiation source 11.

[0060] Furthermore, the drying device designs the type and arrangement of the radiation source 11 and the specifications of the housing 12 based on the absorption spectrum of the drying target, the required radiation power density and radiation area, so as to achieve precise drying of the drying target.

[0061] Furthermore, an air duct is provided on the outside of the air guide hole 141, and the dried steam leaves the box 12 along the air duct. An exhaust fan is installed in the air duct to provide power for exhaust.

[0062] Furthermore, the enclosure 12 includes an inner enclosure and an outer enclosure, which are connected by a heat insulation plate or air, for heat insulation and cooling between the inner and outer enclosures, so that the temperature of the outer enclosure is within the required range.

[0063] Furthermore, the outer casing is equipped with a heat dissipation and cooling device for dissipating heat from the casing; the heat dissipation and cooling device is a finned heat sink, a cooling fan, or a water-cooled heat dissipation device.

[0064] Example 2

[0065] Combination Figure 2 This embodiment provides a design method for a radiation drying device based on the absorption spectrum of the drying target. Using an existing 2KW infrared lamp radiation source and a reflector with 90% reflectivity, a device with uniformity >90% and a maximum power density >20W / cm² can be designed. 2 A drying apparatus that meets strength control requirements includes the following steps:

[0066] Step 1: Based on the absorption spectrum of the drying target, select a suitable radiation source 11, as follows:

[0067] Based on the absorption spectrum of the drying target, a suitable lamp radiation source 11 is selected. When the drying target is water, a near-infrared radiation source of 1180nm or 1400nm is selected. If a lamp radiation source with multiple emission peaks is used, the working state of the radiation source 11 can be changed by adjusting the voltage or current of the radiation source 11 through the power supply 13, thereby changing the emission peak of the lamp radiation source 11. The principle used is Planck's law and Wayne's displacement law.

[0068] Step 2: Based on the required radiation power density, target area, and reflectivity of the existing reflector, calculate the required radiation source power and quantity, as follows:

[0069] According to the required radiation power density Target area Given the reflectivity r of the existing reflector, calculate the required power and number of radiation sources 11 using the following formula:

[0070]

[0071]

[0072] in, Indicates radiation energy density, Indicates radiation time. This represents the power of a single radiation source 11. This indicates the number of radiation sources 11.

[0073] Step 3: Design box 12 according to the side length of the radiation target surface, as follows:

[0074] The outlet area of ​​the housing 12 is designed to be more than 1.5 times the target area, or the side length of the outlet of the housing 12 is more than 1.2 times the side length of the radiation target, and the height of the housing is 0.5-2 times the side length of the outlet.

[0075] Step 4: Design the arrangement of radiation sources 11, and control the switching of radiation sources 11 through power supply 13 to change the radiation intensity, as follows:

[0076] According to the uniform light design requirements of the drying device, the radiation source 11 is arranged in a "centrally symmetrical" manner, and the height of the box 12 is not less than 10 times the diameter of the radiation source 11.

[0077] The radiation intensity is changed by controlling the switch of the radiation source 11 through the power supply 13. The requirements for controlling the radiation source 11 are "symmetrical control" and "interval control". "Symmetrical control" means that the switch controls the two radiation sources 11 that are symmetrically located in the center of the box at the same time. "Interval control" means that the switch controls the radiation source in a way that is spaced apart from the radiation source 11 that was previously controlled, and always retains the central radiation source 11.

[0078] In summary, the drying device provided by this invention can achieve the combined use of multiple drying devices, with the following effects:

[0079] First, using a simple box (12cm×30cm×15cm) consisting of seven 2KW near-infrared radiation sources and a light-diffusing plate with 90% reflectivity, a uniformity greater than 90% and a power density greater than 20W / cm² can be achieved for a large target of 10cm×25cm. 2 The radiation distribution, such as Figure 3 The efficiency can reach 55%; when the reflectivity is 70%, the target surface uniformity is greater than 90%, and the power density is greater than 17W / cm². 2 The radiation distribution, such as Figure 4 The efficiency can reach 47%; when the reflectivity is 70%, the target surface uniformity is greater than 90%, and the power density is greater than 15W / cm². 2 The radiation distribution, such as Figure 5 The efficiency can reach 42%.

[0080] Secondly, the output power of the heating radiation source cannot be controlled by a non-linear connection, as this would alter the radiation spectrum. Drying ovens are typically designed using a custom method, and once fixed, cannot be altered. The intensity control method employed in this invention addresses this issue by controlling the output intensity.

[0081] Furthermore, radiation drying has a higher drying efficiency than the currently used hot air drying mode. Radiation can penetrate the material to be dried, and each layer is heated simultaneously, which improves the evaporation efficiency.

[0082] Finally, radiation sources have high energy conversion efficiency, reducing energy consumption. Radiation sources are cheaper than semiconductor light sources and have higher drying efficiency than hot air, which can reduce costs.

[0083] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A radiation drying apparatus based on the absorption spectrum of the drying target, characterized in that, Includes a radiation source (11), a housing (12), and a power supply (13); The radiation source (11) is used to generate radiation; the type, number and arrangement of the radiation source (11) are determined according to the absorption spectrum of the drying target, the required radiation power density and the radiation area. The housing (12) includes a back plate (121), a side plate (123), and a bracket (122). The back plate (121) and the side plate (123) are used to reflect radiation. The side plate (123) is provided with a vent (141) for discharging the dried steam. The bracket (122) is used to fix the radiation source (11). The dimensions of the housing (12) are determined according to the radiation area and the side length of the radiation target surface. The power supply (13) is used to provide the voltage and current required for the radiation source (11) and to control the switching of the individual radiation source (11).

2. The radiation drying apparatus based on the absorption spectrum of the drying target according to claim 1, characterized in that, The radiation source (11) is used to generate infrared radiation.

3. The radiation drying apparatus based on the absorption spectrum of the drying target according to claim 1, characterized in that, An air duct is provided on the outside of the air guide hole (141). The dried steam leaves the box (12) along the air duct. An exhaust fan is installed in the air duct to provide power for exhaust.

4. The radiation drying apparatus based on the absorption spectrum of the drying target according to claim 1, characterized in that, The enclosure (12) includes an inner enclosure and an outer enclosure, which are connected by a heat insulation board for heat insulation between the inner and outer enclosures.

5. The radiation drying apparatus based on the absorption spectrum of the drying target according to claim 4, characterized in that, The outer casing is equipped with a heat dissipation and cooling device for dissipating heat from the casing (12); the heat dissipation and cooling device is a finned heat sink, a cooling fan or a water-cooled heat dissipation device.

6. A design method for a radiation drying apparatus based on the absorption spectrum of a drying target as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step 1: Select a radiation source (11) for radiation based on the absorption spectrum of the drying target. Step 2: Calculate the power and number of radiation sources (11) based on the required radiation power density, target area and reflectivity of existing reflectors; Step 3: Design the dimensions of the box (12) according to the side length of the radiation target surface; Step 4: Determine the arrangement of the radiation source (11) and change the radiation intensity by controlling the switch of the radiation source (11) through the power supply (13).

7. The design method of the radiation drying device based on the absorption spectrum of the drying target according to claim 6, characterized in that, Step 1 involves selecting a radiation source (11) based on the absorption spectrum of the drying target, as detailed below: Select the type of radiation source (11) for radiation based on the absorption spectrum of the drying target; If a radiation source (11) with multiple emission peaks is used, the voltage or current of the radiation source (11) can be adjusted by the power supply (13) to change the working state of the radiation source (11) and thus change the emission peak of the radiation source (11).

8. The design method of the radiation drying device based on the absorption spectrum of the drying target according to claim 6, characterized in that, Step 2 involves calculating the power and quantity of the radiation source (11) based on the required radiation power density, target area, and reflectivity of the existing reflector, as detailed below: According to the required radiation power density Target area Based on the reflectivity r of the existing reflector, calculate the required power and quantity of the radiation source (11), using the following formula: ； ； in, Indicates radiation energy density, Indicates radiation time. This represents the power of a single radiation source (11). This indicates the number of radiation sources (11).

9. The design method of the radiation drying device based on the absorption spectrum of the drying target according to claim 6, characterized in that, The dimensions of the box (12) designed according to the side length of the radiation target surface in step 3 are as follows: The outlet area of ​​the box (12) is more than 1.5 times the target area, or, when the target is square, the box (12) is a cuboid and the outlet side length is more than 1.2 times the side length of the radiation target; when the target is circular, the box (12) is a cylinder and the outlet radius is more than 1.2 times the radius of the radiation target. The height of the box (12) is 0.5-2 times the length or diameter of the outlet side.

10. The design method of the radiation drying device based on the absorption spectrum of the drying target according to claim 6, characterized in that, Step 4 describes determining the arrangement of the radiation sources (11). The radiation intensity is changed by controlling the switching of the radiation sources (11) through the power supply (13), as follows: According to the uniform light design requirements of the drying device, the radiation source (11) is designed to be arranged in a centrally symmetrical manner. The radiation intensity is changed by controlling the switch of the radiation source (11) through the power supply (13). The requirements for controlling the radiation source (11) are symmetrical control and interval control. Symmetrical control means that the switch controls two radiation sources (11) that are symmetrically located in the box (12) at the same time. Interval control means that the switch controls the radiation source according to the radiation source (11) that is separated from the radiation source (11) that was controlled last time, and always retains the central radiation source.

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