Electromagnetic induction rotating wheel device for continuously purifying VOCs in industrial waste gas

Abstract

The invention belongs to the field of engineering technology application, and particularly relates to an electromagnetic induction rotating wheel device for continuously purifying industrial waste gas VOCs (volatile organic compounds), the rotating wheel device comprises an electromagnetic rotating wheel, an electromagnetic induction heating mechanism and a gas inlet mechanism, the area, corresponding to the electromagnetic induction heating mechanism, of the electromagnetic rotating wheel is an electromagnetic regeneration area, a plurality of grid nets are arranged on the electromagnetic rotating wheel, filler is arranged in the grid nets and comprises magnetocaloric materials and molecular sieve adsorption materials, and the molecular sieve adsorption materials and the magnetocaloric materials in the grid nets are alternately stacked. When the electromagnetic rotating wheel rotates, the grid meshes on the electromagnetic rotating wheel alternately pass through the adsorption area and the electromagnetic regeneration area to alternately realize adsorption and desorption. According to the invention, integrated dynamic continuous purification of VOCs in large-air-volume industrial tail gas is realized.

Description

Technical Field

[0001] This invention belongs to the field of engineering technology application, and in particular relates to an electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas. Specifically, it relates to an electromagnetic induction rotor device that integrates dynamic rotational purification and electromagnetic induction drive to complete "desorption-catalytic oxidation", which is suitable for continuous purification of medium and low concentration VOCs in large volume industrial waste gas. Background Technology

[0002] With the development of the national economy and the improvement of people's living standards, air pollution has attracted increasing attention. Industrial waste gas, characterized by its strong dispersion, wide pollution range, and difficulty in centralized treatment, is a key focus of air pollution prevention and control. Industrial waste gas contains a complex variety of pollutants, among which volatile organic compounds (VOCs) are the most representative, mainly originating from industries such as petrochemicals, printing, and coating. VOCs are diverse, including aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, alcohols, esters, and aldehydes. Under natural conditions, VOCs react with nitrogen oxides (NOx). x VOCs generate secondary pollutants such as ozone and PM2.5 through photochemical reactions, which directly harm the environment and human health. Furthermore, some VOCs have teratogenic, carcinogenic, and mutagenic effects on the human body. Therefore, reducing VOC emissions from industrial sources has become an urgent and important issue that needs to be addressed.

[0003] Currently, VOCs emission reduction from industrial sources mainly relies on the application of end-of-pipe treatment technologies. Based on different purification principles, end-of-pipe treatment technologies can be categorized as: physical adsorption, solvent absorption, low-temperature condensation, high-temperature thermal incineration, low-temperature plasma, catalytic oxidation, biodegradation, and photocatalytic degradation. Each of these methods has its own applicable scope, with physical adsorption, high-temperature thermal incineration, and catalytic oxidation being the most widely used. Physical adsorption, limited by the adsorbent's purification capacity, is primarily used as a pre-treatment technology for industrial waste gas in practice, aiming to achieve both waste gas reduction and VOCs concentration improvement. Currently, the most popular industrial waste gas treatment methods are the combined technologies of "physical adsorption-high-temperature thermal incineration" and "physical adsorption-catalytic oxidation." In these combined technologies, physical adsorption serves as a single module for VOCs pretreatment, also known as the "adsorption pre-concentration" unit, while high-temperature thermal incineration and catalytic oxidation act as destruction modules, completely oxidizing the concentrated VOCs into CO2 and water, respectively. Compared to high-temperature thermal incineration, catalytic oxidation has advantages such as lower reaction temperature and less secondary pollution, and is considered to have greater application and promotion prospects. However, existing "adsorption pre-concentration-catalytic oxidation" technology relies on traditional heat exchange to heat the catalytic bed and regenerate the adsorption rotor, which suffers from slow start / stop speeds, high energy consumption, and large equipment footprint. Therefore, developing a new "adsorption pre-concentration-catalytic oxidation" purification technology under a new heating mode has become a key issue that needs to be addressed to improve VOCs purification efficiency and reduce carbon emissions during waste gas purification.

[0004] Electromagnetic induction is a novel heating technology. Its working principle is based on the generation of eddy currents within a ferromagnetic conductor using a high-frequency alternating electromagnetic field, thereby causing the material to heat up as a whole. Compared to traditional heat transfer heating methods, electromagnetic induction technology offers higher energy efficiency and a faster heating rate. Based on this, research using electromagnetic induction heating technology to drive catalytic reactions has attracted increasing attention in recent years. Some studies have also applied it to the catalytic oxidation of VOCs, achieving higher reactivity than traditional heating methods. Notably, some studies have shown that electromagnetic induction can drive VOCs adsorption, enrichment, and catalytic oxidation within the same purification module. However, current technologies can only achieve cyclic purification of VOCs using a multi-path intermittent mode, making them unsuitable for continuous purification of VOCs in large-volume industrial exhaust gases. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides an electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas. This device can achieve integrated dynamic continuous purification of VOCs in large-volume industrial exhaust gas.

[0006] As mentioned above, the present invention provides an electromagnetic induction rotor device for continuous purification of industrial waste gas VOCs, including an electromagnetic rotor, an electromagnetic induction heating mechanism, and an air intake mechanism. The area on the electromagnetic rotor corresponding to the air intake mechanism is an adsorption area, and the area on the electromagnetic rotor corresponding to the electromagnetic induction heating mechanism is an electromagnetic regeneration area. The electromagnetic rotor is provided with a plurality of grids, and the grids are filled with packing material, which includes magnetocaloric material and molecular sieve adsorption material. The molecular sieve adsorption material and magnetocaloric material in the grids are stacked alternately. When the electromagnetic rotor rotates, the grids on the electromagnetic rotor alternately pass through the adsorption area and the electromagnetic regeneration area, thereby alternately achieving adsorption and desorption.

[0007] According to an embodiment of the present invention, the alternating stacking of the molecular sieve adsorbent and the magnetocaloric material helps the magnetocaloric material transfer heat energy to the molecular sieve adsorbent, forcing VOCs to be released back into the gaps between the stacked materials, and utilizing the catalytic active sites of the magnetocaloric material to completely catalytically oxidize and degrade the concentrated VOCs.

[0008] According to an embodiment of the present invention, the fan-shaped structure corresponding to the adsorption area on the surface of the electromagnetic wheel is an adsorption fan-shaped structure, and the fan-shaped structure corresponding to the electromagnetic regeneration area on the surface of the electromagnetic wheel is an electromagnetic regeneration fan-shaped structure.

[0009] According to an embodiment of the present invention, the molecular sieve adsorption material in the grid of the adsorption fan-shaped region can absorb VOCs in the industrial waste gas introduced by the air intake mechanism; the electromagnetic induction heating mechanism is used to provide an alternating magnetic field for the grid of the electromagnetic regeneration fan-shaped region, and to excite the magnetocaloric material in the grid corresponding to the electromagnetic regeneration fan-shaped region to generate high heat under the alternating magnetic field. When the grid with adsorbed VOCs is located in the electromagnetic regeneration region, it can oxidize and degrade the adsorbed VOCs.

[0010] According to an embodiment of the present invention, the air intake mechanism includes a booster fan and an exhaust fan mechanism. The booster fan is disposed at the front end of the electromagnetic rotor, and the exhaust fan mechanism is disposed at the rear end of the electromagnetic rotor, with the booster fan and the exhaust fan mechanism arranged opposite to each other.

[0011] According to an embodiment of the present invention, the angle of the adsorption fan corresponding to the adsorption region is 20-90°, preferably 30-70°, and more preferably 45-60°.

[0012] According to an embodiment of the present invention, the angle of the electromagnetic adsorption fan corresponding to the electromagnetic regeneration area is 45-90°, and preferably the angle of the electromagnetic regeneration fan is 20-60°.

[0013] According to an embodiment of the present invention, the electromagnetic wheel is a circular ring structure, wherein the outer ring radius (R) of the circular ring structure is 1.5 to 3 m, and the inner ring radius (r) is 0.25 to 1 m.

[0014] According to an embodiment of the present invention, the thickness (W) of the electromagnetic rotor is 0.1–0.5 μm to avoid excessive thickness causing large wind resistance and pressure drop. According to an embodiment of the present invention, the airflow rate in the adsorption zone is 0.1%–1% of the total airflow rate of the electromagnetic rotor. Based on the principle of conservation of mass, the VOCs concentration in the exhaust gas after the airflow rate is reduced is significantly increased. Therefore, it is estimated that the VOCs concentration ratio in the adsorption-redesorption exhaust gas is 100–1000 times compared to the exhaust gas before adsorption treatment.

[0015] According to an embodiment of the present invention, the electromagnetic induction heating mechanism includes an AC power supply, a power battery, and an induction coil. The induction coil is connected to the cross-linked power supply through the power battery. The induction coil is disposed in the electromagnetic regeneration region and is sleeved in the corresponding electromagnetic regeneration region. The electromagnetic heating range is precisely controlled within the winding by using an electromagnetic induction coil loop. The electromagnetic induction coil includes several windings, and the areas covered by different windings may be the same or different. For example, multiple interlocking windings can cover the same area.

[0016] According to an embodiment of the present invention, the high-frequency magnetic field strength generated by the electromagnetic induction heating mechanism is between 8mT and 100mT, and the alternating frequency is between 2000Hz and 100,000Hz.

[0017] According to an embodiment of the present invention, the working power of the electromagnetic induction heating mechanism is between 10kW and 100kW, and a vehicle power battery is used as the regenerative power supply for the rotor to avoid the impact of the instantaneous high-intensity power supply of the induction coil on the surrounding power grid.

[0018] According to an embodiment of the present invention, the booster fan is connected to the industrial waste gas outlet and is used to boost the industrial waste gas and, with the cooperation of the initiation mechanism, deliver the industrial waste gas to the grid of the electromagnetic rotor in the adsorption area, where VOCs in the waste gas are adsorbed and enriched at room temperature.

[0019] According to an embodiment of the present invention, the device further includes a housing, the electromagnetic wheel is located inside the housing, the air intake mechanism is disposed on the housing, the induction coil is located inside the housing, and the AC power supply and power battery are located outside the housing.

[0020] According to an embodiment of the present invention, the outer casing is further provided with an air outlet mechanism.

[0021] According to an embodiment of the present invention, the device further includes a drive mechanism for driving the electromagnetic wheel to rotate.

[0022] According to an embodiment of the present invention, the grid is made of one or more of the following: 316 stainless steel sound insulation mesh, 304 stainless steel sound insulation mesh, aluminum alloy sound insulation mesh sheet, heat-resistant fiberglass grid plate, high-temperature resistant carbon fiber grid plate, ceramic composite grid plate, etc.

[0023] According to an embodiment of the present invention, the molecular sieve adsorbent material is selected from one or more of Y-type and ZSM-type molecular sieves, such as strips, hollow tubes, and spherical particles.

[0024] According to an embodiment of the present invention, the molecular sieve adsorbent material is loaded with highly dispersed noble metal nano-active centers such as Pt, Ru, and Pd on its surface.

[0025] According to an embodiment of the present invention, the magnetocaloric catalytic material is one or more of magnetocaloric materials such as iron fiber and 430 stainless steel fiber.

[0026] Secondly, the present invention provides an application of the above-mentioned electromagnetic induction rotor device in purifying industrial waste gas VOCs.

[0027] Thirdly, the present invention also provides a method for purifying industrial waste gas VOCs using the above-mentioned electromagnetic induction rotor device, comprising the following steps:

[0028] S1. Turn on the booster fan and the exhaust mechanism so that the zeolite molecular sieve in the grid of the electromagnetic wheel in the adsorption area adsorbs VOCs in the large volume of industrial waste gas.

[0029] S2. Rotating the electromagnetic induction wheel causes the grid mesh with adsorbed VOCs to rotate to the regeneration area. A high-frequency, high-current is applied to the induction coil, causing the temperature of the magnetocaloric material to rapidly rise to T1. Electromagnetic induction heating is then quickly stopped, causing the temperature to drop to T2. The lost heat is absorbed by the molecular sieve, which promotes the release of VOCs in the pores.

[0030] S3. Electromagnetic induction is activated again, and the temperature of the magnetocaloric catalytic material jumps to T1 again, and is maintained at this temperature for a short period of time to ensure that the VOCs in the grid gaps are completely oxidized and degraded.

[0031] According to an embodiment of the present invention, the waste gas adsorption treatment time in step S1 is the thickness of the electromagnetic induction wheel / the waste gas flow rate, and the working time of the adsorption fan is the fan angle / the angular velocity of the wheel.

[0032] According to an embodiment of the present invention, T1 is above the boiling point temperature of the highest boiling point species in the mixed VOCs. Preferably, the difference between T1 and the boiling point of the highest boiling point species in the mixed VOCs is greater than or equal to 50°. It is usually necessary to be 50° higher than the highest boiling point temperature to ensure that the VOCs can be desorbed quickly. Since the boiling point of most organic solvents is below 150°C, the temperature of T1 is set to 200°C or above.

[0033] According to an embodiment of the present invention, T2 is the temperature at which the heat of the magnetocaloric material is transferred to the bed of the molecular sieve, which is usually 50°C lower than T1, and is therefore set to 150°C.

[0034] According to an embodiment of the present invention, in step S3, the holding time under T1 is 5 to 10 minutes. The specific time is determined by the difficulty of VOCs desorption. Generally, a longer time is required for high molecular weight, high boiling point, and highly polar VOCs molecules to achieve sufficient desorption.

[0035] The solution of the present invention achieves the following beneficial effects:

[0036] 1) The electromagnetic induction driven rotary adsorption enrichment-catalytic oxidation integrated VOCs purification technology of this invention is suitable for continuous purification of large-volume industrial waste gas. It is small in size and uses electromagnetic induction for temperature control, which makes the temperature control more accurate and the equipment has lower operating costs. It solves the problems of large equipment footprint and high maintenance costs caused by the separate operation of traditional rotary adsorption and catalytic oxidation modules. It provides a new equipment design idea for efficient VOCs purification and has high practicality and promotion value.

[0037] 2) The volumetric flow rate of the waste gas after concentration by the electromagnetic induction zeolite rotor of this invention is only 5-10% of that of the traditional rotor adsorption technology, and it directly converts VOCs in one step. Therefore, compared with the existing zeolite rotor + catalytic oxidation equipment, this invention can save more than 90% of heating energy consumption. In this invention, the VOCs concentration ratio is controlled between 100 and 1000 times. The concentration ratio is the most important parameter for evaluating the adsorption pre-concentration efficiency. The VOCs concentration ratio in the existing rotor technology is between 10 and 20 times, which is much lower than that of this invention. Attached Figure Description

[0038] Figure 1 This is a simplified structural diagram of the electromagnetic induction rotary device of the present invention.

[0039] Figure 2 This is a schematic diagram of the operation of the electromagnetic induction rotary device of the present invention.

[0040] Figure 3 This is a simplified diagram of the wheel structure design in the electromagnetic induction rotary device of the present invention.

[0041] Figure 4 This is a schematic diagram of the grid structure in the electromagnetic induction rotary device of the present invention.

[0042] Figure 5 This is a schematic diagram showing the pulse temperature rise of the electromagnetic regeneration sector under the action of the induction coil during the operation of the electromagnetic induction rotary device of the present invention.

[0043] Figure 6 This is a schematic diagram of VOCs migration and conversion during the operation of the electromagnetic induction rotary device of the present invention.

[0044] Figure label:

[0045] 1-Electromagnetic rotor 1, 2-Electromagnetic induction heating mechanism, 3-Booster fan, 4-Air extraction mechanism, 5-Adsorption fan surface, 6-Electromagnetic regeneration fan surface, 7-Grid mesh. Detailed Implementation

[0046] The electromagnetic induction rotary device of the present invention and its applications will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0047] Example 1

[0048] An electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas, see [link to relevant documentation]. Figure 1 and Figure 2 As shown, it includes an electromagnetic rotor 1, an electromagnetic induction heating mechanism 2, a booster fan 3, and an exhaust mechanism 4. The electromagnetic induction heating mechanism 2 is connected to the electromagnetic rotor 1 and is used to provide an alternating magnetic field to the electromagnetic rotor 1, stimulating the corresponding parts in the electromagnetic rotor 1 to generate high heat under the alternating magnetic field. The booster fan 3 is located at the front end of the electromagnetic rotor 1, and the exhaust mechanism 4 is located at the rear end of the electromagnetic rotor 1. The booster fan 3 and the exhaust mechanism 4 are arranged opposite to each other. The booster fan 3 is connected to the industrial waste gas outlet and is used to boost the industrial waste gas and, with the cooperation of the booster fan 4, transfer the industrial waste gas to the electromagnetic rotor 1.

[0049] The electromagnetic induction rotating wheel device also includes a housing and a drive mechanism. The electromagnetic rotating wheel 1 is located inside the housing, the air intake mechanism is set on the housing, the induction coil is located inside the housing, the AC power supply and the power battery are located outside the housing, and the housing is also provided with an air outlet mechanism. The drive mechanism is used to drive the electromagnetic rotating wheel 1 to rotate.

[0050] The area on the electromagnetic rotor 1 corresponding to the air intake mechanism is the adsorption area, and the area on the electromagnetic rotor 1 corresponding to the electromagnetic induction heating mechanism 2 is the electromagnetic regeneration area. Several grids 7 are provided on the electromagnetic rotor 1, and fillers 8 are provided in the grids 7. The fillers 8 include magnetocaloric materials and molecular sieve adsorption materials. The molecular sieve adsorption materials and magnetocaloric materials in the grids 7 are stacked alternately. When the electromagnetic rotor 1 rotates, the grids 7 on the electromagnetic rotor 1 alternately pass through the adsorption area and the electromagnetic regeneration area, and alternately realize adsorption and desorption.

[0051] See Figure 4As shown, each grid 7 has a side length of 5–15 cm. The grid 7 is made of non-magnetic-thermal metal components or composite ceramic materials. The main function of the grid 7 is to provide support for the molecular sieve adsorbent material and the magnetocaloric material. The alternating stacking of the molecular sieve adsorbent material and the magnetocaloric material helps the magnetocaloric material transfer heat energy to the molecular sieve adsorbent material, forcing VOCs to be released back into the gaps between the stacked materials, and utilizing the catalytic properties of the magnetocaloric material to completely oxidize and degrade the concentrated VOCs.

[0052] See Figure 2 As shown, the electromagnetic induction heating mechanism 2 includes an AC power supply, a power battery, and an induction coil. The end of the induction coil is connected to the electromagnetic rotor 1, and the induction coil is connected to the cross-linked power supply through the power battery. The electromagnetic heating range is precisely controlled within the winding by using an electromagnetic induction coil loop. The electromagnetic induction coil is connected to the electromagnetic induction excitation device, and the generated high-frequency magnetic field strength is between 8mT and 100mT, with an alternating frequency between 2000Hz and 100,000Hz. The working power of the electromagnetic induction excitation device is between 10kW and 100kW, and a vehicle power battery is used as the regenerative power supply for the rotor to avoid the impact of the instantaneous high-intensity power supply of the electromagnetic induction coil on the surrounding power grid.

[0053] See Figure 3 As shown, the electromagnetic rotor 1 has a circular ring structure with an outer ring radius (R) of 1.5–3 m and an inner ring radius (r) of 0.25–1 m. The thickness (W) of the electromagnetic rotor 1 is 0.1–0.5 m to avoid excessive thickness that would cause a large wind resistance pressure drop. The fan-shaped structure on the surface of the electromagnetic rotor 1 corresponding to the adsorption area is the adsorption fan 5, and the fan-shaped structure on the surface of the electromagnetic rotor 1 corresponding to the electromagnetic regeneration area is the electromagnetic regeneration fan 6 (adsorption fan 5 and electromagnetic regeneration fan 6 are the fan-shaped structures currently corresponding to the corresponding areas). The angle of the adsorption fan 5 is 45–90°, the angle of the electromagnetic regeneration fan 6 is 20–60°, the airflow of the electromagnetic regeneration fan 6 is 0.1%–1% of the total airflow of the adsorption fan 5, and the VOCs concentration ratio is 100–1000 times.

[0054] The grid 7 is made of one or more of the following: 316 stainless steel sound insulation mesh, 304 stainless steel sound insulation mesh, aluminum alloy sound insulation mesh sheet, heat-resistant fiberglass grid plate, high-temperature resistant carbon fiber grid plate, ceramic composite grid plate, etc.; the molecular sieve adsorption material is preferably Y-type and ZSM type molecular sieve strips, hollow tubes, spherical particles, etc.; the magnetothermal catalytic material is one or more of the following: iron fiber, 430 stainless steel fiber, etc.; the surface of the molecular sieve adsorption material is loaded with highly dispersed noble metal nano-active centers such as Pt, Ru, Pd, etc.

[0055] See Figure 5As shown, the electromagnetic induction pulse heating method is as follows: The working sector, which adsorbs and enriches VOCs at room temperature, rotates into the regeneration sector. A high-frequency, high-current is applied to the induction coil, causing the temperature of the magnetocaloric material to rapidly rise to T1. Electromagnetic induction heating is then quickly stopped, allowing the temperature to drop to T2. The lost heat is absorbed by the molecular sieve adsorption material, causing the VOCs within the channels of the grid 7 to be released. Immediately afterwards, electromagnetic induction is restarted, and the temperature of the magnetocaloric material rises back to T1. This temperature is maintained for a short period to ensure that the VOCs within the channels of the grid 7 are completely oxidized and degraded. The distribution of VOCs in the grid 7 during the entire temperature change process is shown in the figure. Figure 6 As shown.

[0056] Example 2

[0057] An application method for removing toluene using the electromagnetic induction rotary device in Embodiment 1.

[0058] With an air volume of 10,000 Nm 3 Taking the purification of industrial waste gas with a toluene concentration of 100 ppm per hour as an example, supplemented by Figure 3 The design structure of the equipment is described. The proposed rotor has an outer radius (R) of 1.5m and an inner radius (r) of 0.25m, with an overall windward area of ​​6.87m². 2 The adsorption fan angle of the rotating wheel is 60°, meaning the area of ​​the adsorption fan is 1.14m². 2 To ensure a contact time of 100ms between the industrial waste gas and the rotor, the rotor thickness needs to reach 0.24m, and the total volume of the zeolite rotor is approximately 1.65m³. 3 After deducting the volume redundancy of the wheel frame, the actual effective load capacity accounts for approximately 85%, which is about 1.40m³. 3 Of this, approximately half of the load capacity is occupied by the molecular sieve, meaning the molecular sieve requires 0.70m³. 3 Based on the adsorption-desorption properties of toluene, strip-shaped NaY molecular sieves with a bulk density of approximately 800 kg / m³ are preferred. 3 This means that approximately 560 kg of molecular sieve is required.

[0059] Under ideal conditions, the toluene adsorption capacity of the molecular sieve is about 0.1 g / g, which means that the total amount of toluene adsorbed by the rotor in one go is about 56 kg. Therefore, under the premise of ensuring that the toluene removal rate is greater than 95%, for exhaust gas containing about 4.2 kg of toluene per hour, the rotor can meet the purification requirements by rotating once every 14 hours, that is, the minimum rotor speed is not less than 0.07 rpm.

[0060] Based on the characteristics of toluene catalytic oxidation, Fe fiber-supported noble metal Pt is the preferred catalyst, with a complete oxidation temperature of approximately 200℃. This is based on the fiber material's bulk density of 100 kg / m³. 3It requires approximately 70 kg of metal fiber material, with the precious metal load controlled at 0.3%, which means about 210 g of precious metal raw materials are needed. The electromagnetic induction heating power is about 30 kW, using intermittent pulse heating. Its actual heating time is about 1 / 3 of the total purification time, meaning the electromagnetic energy consumption of the rotor regeneration is about 10 kWh.

[0061] Example 2

[0062] With an air volume of 100,000 Nm 3 Taking the purification of industrial waste gas with a toluene concentration of 100 ppm per hour as an example, supplemented by Figure 3 The design structure of the equipment is described. The proposed rotor has an outer radius (R) of 3m and an inner radius (r) of 0.25m, with an overall windward area of ​​28.1m². 2 The adsorption fan angle of the rotating wheel is 90°, meaning the area of ​​the adsorption fan is 7.0 m². 2 To ensure a contact time of 100ms between the industrial waste gas and the rotor, the rotor thickness needs to reach 0.40m, and the total volume of the zeolite rotor is approximately 11.24m³. 3 After deducting the volume redundancy of the wheel frame, the actual effective load capacity accounts for approximately 85%, which translates to a volume of approximately 9.55m³. 3 Of this, approximately half of the load capacity is occupied by the molecular sieve, meaning the molecular sieve requires 4.78m³. 3 Based on the adsorption-desorption properties of toluene, strip-shaped NaY molecular sieves with a bulk density of approximately 800 kg / m³ are preferred. 3 This requires approximately 3822 kg of molecular sieve packing. Under ideal conditions, the toluene adsorption capacity of the molecular sieve is approximately 0.1 g / g, meaning the rotor can adsorb approximately 382.2 kg of toluene in a single pass. Therefore, to ensure a toluene removal rate greater than 95%, for waste gas containing approximately 42 kg of toluene per hour, the rotor only needs to rotate once every 9.1 hours to meet the purification requirements, meaning the minimum rotor speed should not be less than 0.11 rpm. Based on the characteristics of toluene catalytic oxidation, Fe fiber-supported Pt is the preferred catalyst. The complete oxidation temperature of toluene in Pt is approximately 200℃, and based on the fiber material's bulk density of 100 kg / m³... 3 It requires approximately 477.8 kg of metal fiber material, with the precious metal load controlled at 0.3%, which means about 1433 g of precious metal raw materials are needed. The electromagnetic induction heating power is about 90 kW, using intermittent pulse heating, and its actual heating time is about 1 / 3 of the total purification time, meaning that the electromagnetic energy consumption of the rotor regeneration is about 30 kWh.

[0063] The specific embodiments of the present invention have been described above by way of example. However, the scope of protection of the present invention is not limited to the above exemplary embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas, characterized in that, The device includes an electromagnetic rotor, an electromagnetic induction heating mechanism, and an air intake mechanism. The area on the electromagnetic rotor corresponding to the air intake mechanism is an adsorption area, and the area on the electromagnetic rotor corresponding to the electromagnetic induction heating mechanism is an electromagnetic regeneration area. The electromagnetic rotor is provided with several grids, and the grids are filled with filler, which includes magnetocaloric material and molecular sieve adsorption material. The molecular sieve adsorption material and magnetocaloric material in the grids are stacked alternately. When the electromagnetic rotor rotates, the grids on the electromagnetic rotor alternately pass through the adsorption area and the electromagnetic regeneration area, alternately realizing adsorption and desorption.

2. The electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas according to claim 1, characterized in that, The fan-shaped structure on the surface of the electromagnetic rotor corresponding to the adsorption area is an adsorption fan, and the fan-shaped structure on the surface of the electromagnetic rotor corresponding to the electromagnetic regeneration area is an electromagnetic regeneration fan. The molecular sieve adsorption material in the grid of the adsorption fan area can absorb VOCs in the industrial waste gas introduced by the air intake mechanism. The electromagnetic induction heating mechanism is used to provide an alternating magnetic field for the grid of the electromagnetic regeneration fan area, which excites the magnetocaloric material in the grid corresponding to the electromagnetic regeneration fan to generate high heat under the alternating magnetic field. When the grid with adsorbed VOCs is located in the electromagnetic regeneration area, it can oxidize and degrade the adsorbed VOCs.

3. The electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas according to claim 1 or 2, characterized in that, The angle of the adsorption fan corresponding to the adsorption region is 20-90°, preferably 30-70°. Preferably, the angle of the electromagnetic adsorption fan corresponding to the electromagnetic regeneration area is 45-90°, and more preferably the angle of the electromagnetic regeneration fan is 20-60°.

4. The electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas according to claim 1 or 2, characterized in that, The electromagnetic wheel has a circular ring structure, with an outer ring radius (R) of 1.5–3 m and an inner ring radius (r) of 0.25–1 m. Preferably, the thickness (W) of the electromagnetic wheel is between 0.1 and 0.5 m.

5. The electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas according to claim 1 or 2, characterized in that, The electromagnetic induction heating mechanism includes an AC power supply, a power battery, and an induction coil. The induction coil is connected to the cross-linked power supply through the power battery. The induction coil is disposed in the electromagnetic regeneration area and is sleeved in the corresponding electromagnetic regeneration area.

6. The electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas according to claim 1 or 2, characterized in that, The grid is made of one or more of the following: 316 stainless steel sound insulation mesh, 304 stainless steel sound insulation mesh, aluminum alloy sound insulation mesh sheet, heat-resistant fiberglass grid plate, high-temperature resistant carbon fiber grid plate, and ceramic composite grid plate.

7. The electromagnetic induction rotor device for continuous purification of VOCs in industrial waste gas according to claim 1 or 2, characterized in that, The molecular sieve adsorbent material is selected from one or more of the following: Y-type and ZSM-type molecular sieves in the form of strips, hollow tubes, or spherical particles. Preferably, the surface of the molecular sieve adsorbent material is loaded with highly dispersed noble metal nano-active centers such as Pt, Ru, and Pd. Preferably, the magnetocaloric catalytic material is one or more of magnetocaloric materials such as iron fiber and 430 stainless steel fiber.

8. The application of the electromagnetic induction rotor device according to any one of claims 1-7 in the purification of industrial waste gas VOCs.

9. A method for purifying VOCs in industrial waste gas using the electromagnetic induction rotor device according to any one of claims 1-7, comprising the following steps: S1. Turn on the booster fan and the exhaust mechanism so that the zeolite molecular sieve in the grid of the electromagnetic wheel in the adsorption area adsorbs VOCs in the large volume of industrial waste gas. S2. Rotating the electromagnetic induction wheel causes the grid mesh with adsorbed VOCs to rotate to the regeneration area. A high-frequency, high-current is applied to the induction coil, causing the temperature of the magnetocaloric material to rapidly rise to T1. Electromagnetic induction heating is then quickly stopped, causing the temperature to drop to T2. The lost heat is absorbed by the molecular sieve, which promotes the release of VOCs in the pores. S3. Electromagnetic induction is activated again, and the temperature of the magnetocaloric catalytic material jumps to T1 again, and is maintained at this temperature for a short period of time to ensure that the VOCs in the grid gaps are completely oxidized and degraded.

10. The method for purifying VOCs in industrial waste gas according to claim 9, characterized in that, T1 is the temperature above the boiling point of the species with the highest boiling point in the mixed VOCs. Preferably, T2 is the temperature of the bed after the heat of the magnetocaloric material is transferred to the molecular sieve.

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