Electrothermal catalytic purification kitchen smoke treatment device

Abstract

The utility model relates to the technical field of cooking fume purification, and particularly discloses an electrothermal catalytic purification kitchen fume treatment device which comprises a catalytic reaction module and a control function module, the catalytic reaction module comprises a shell and a plurality of electrothermal coupling catalytic layers arranged in the shell, a fan is arranged at the air outlet end of the shell, and the two ends of each electrothermal coupling catalytic layer are connected with end electrodes respectively; the control function module comprises an oil smoke concentration detection unit and a main controller, and the main controller is used for adjusting the rotating speed of the fan and the magnitude of current input into the electrothermal coupling catalyst layer according to the oil smoke concentration of the air inlet end. Current is applied to the electric heating coupling catalyst layer to generate an in-situ Joule heating effect, a catalyst is rapidly heated, the temperature is uniformly distributed, electric heating concerted catalysis is realized, oil smoke mixed gas is decomposed into CO2 and H2O, and rapid, stable and efficient kitchen smoke catalytic purification is realized; and the device is small in size, simple in structure and suitable for range hoods, ventilators, (steaming) ovens, microwave ovens and the like.

Description

Technical Field

[0001] The present application relates to the technical field of oil fume purification, and in particular to an electrothermal catalytic purification kitchen fume treatment device. Background Art

[0002] Studies have shown that kitchen fumes contain more than 300 harmful substances, such as inhalable particulate matter, volatile organic compounds, etc. Long-term exposure to the fume environment may lead to respiratory diseases, cardiovascular diseases, cancer and other problems.

[0003] At present, the kitchen fume treatment method has gone through three generations: the first generation, the fume suction and emptying method, this method is simple and economical, but the fume is directly discharged to pollute the air environment; the second generation, the fume filtration and separation method, the waste oil formed by condensation causes secondary pollution, the sludge adheres to the impeller and the air duct to increase the running resistance, and the accumulation of oil droplets in the box increases the risk of fire. The third generation, the fume is decomposed and purified into CO2 and H2O, which fundamentally removes the fume and eliminates secondary pollution. However, the third generation of fume decomposition and purification currently has problems such as short reaction time when the amount of fume is large and low fume removal rate. Utility Model Content

[0004] In view of the shortcomings of the third-generation oil fume decomposition and purification technology, the present application provides an electrothermal catalytic purification kitchen fume treatment device.

[0005] The present application provides an electrothermal catalytic purification kitchen smoke treatment device that adopts the following technical solution:

[0006] An electrothermal catalytic purification kitchen smoke treatment device comprises a catalytic reaction module and a control function module;

[0007] Wherein, the catalytic reaction module comprises:

[0008] A housing, wherein an air inlet and an air outlet are provided on the housing, and a fan is provided on the air outlet;

[0009] A plurality of electrothermal coupling catalytic layers are arranged in sequence in the shell along the gas flow direction, wherein the electrothermal coupling catalytic layers are porous conductive layers loaded with three-dimensional metal skeleton catalysts;

[0010] A current regulating unit, used for inputting current into the electrothermal coupling catalytic layer;

[0011] The control function module includes:

[0012] An oil fume concentration detection unit, used to detect the oil fume concentration at the air inlet and the air outlet;

[0013] The main controller is electrically connected to the oil fume concentration detection unit and is used to adjust the rotation speed of the fan and the current input to the electrothermal coupling catalytic layer according to the oil fume concentration at the air inlet end.

[0014] Furthermore, the current regulating unit includes terminal electrodes connected to both ends of the electrothermal coupling catalytic layer.

[0015] When the fan is started, the oil fume mixture enters the shell from the air inlet end, and is discharged from the air outlet end after catalytic decomposition by the electrothermal coupling catalyst layer. In this process, the end electrode inputs current into the electrothermal coupling catalyst layer, causing the electrothermal coupling catalyst layer to produce an in-situ Joule heating effect, and self-heating reaches the thermal catalytic reaction temperature. At the same time, the current also forms an electric field to cause the active sites of the electrothermal coupling catalyst layer to produce an electrocatalytic effect, realizing electrothermal synergistic catalysis, and decomposing the oil fume mixture into CO2 and H2O. The catalyst layer is heated in situ by electricity, without the need for an external heat source, reducing energy loss and energy consumption. Multiple catalytic layers increase the contact area and contact time between the oil fume mixture and the catalyst, thereby improving the oil fume removal efficiency and reducing the oil fume escape rate.

[0016] The oil fume concentration detection unit detects the oil fume concentration at the air inlet and outlet ends. The main controller adjusts the speed of the fan and the current input to the electrothermal coupling catalytic layer according to the oil fume concentration at the air inlet end, thereby adjusting the heating temperature of the electrothermal coupling catalytic layer and the electric field strength on the active sites of the built-in catalyst, thereby achieving the adjustment of the kitchen fume purification power, which is beneficial to reducing energy consumption while ensuring the purification effect.

[0017] Furthermore, an air intake screen is provided on one side of the shell body close to the air intake end.

[0018] The air intake screen allows the oil smoke mixture to enter the catalyst layer evenly.

[0019] Furthermore, an air outlet screen is provided on one side of the shell body close to the air outlet end.

[0020] The gas outlet screen helps to slow down the gas flow rate so that the gas can fully contact with the electrothermal coupling catalytic layer for decomposition.

[0021] Furthermore, the fan is a variable frequency fan.

[0022] Furthermore, the oil fume concentration detection unit includes two oil fume concentration sensors, which are respectively arranged at the air inlet end and the air outlet end of the shell, and the oil fume concentration sensors are electrically connected to the main controller.

[0023] Furthermore, the fan is electrically connected to the main controller.

[0024] Furthermore, the terminal electrode is electrically connected to the main controller.

[0025] The oil fume concentration sensor detects the oil fume concentration at the air inlet and outlet ends. The main controller obtains the oil fume concentration and compares it with the threshold value to determine whether the fan is turned on and whether the electrothermal coupling catalytic layer is working. Different gears are set according to different preset values ​​of the oil fume concentration, and the speed of the fan and the current input to the electrothermal coupling catalytic layer are adjusted.

[0026] Furthermore, the end electrode is connected to an adjustment knob for adjusting the magnitude of the current input into the electrothermal coupling catalytic layer.

[0027] In manual mode, the current input to the electrothermal coupling catalytic layer can be adjusted by adjusting the knob, thereby adjusting the heating temperature of the electrothermal coupling catalytic layer and the electric field strength on the active sites of the built-in catalyst, thereby achieving the adjustment of the kitchen smoke purification power.

[0028] Furthermore, a temperature sensor is arranged in the shell.

[0029] The temperature sensor can detect the gas temperature in the shell.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The present application generates an in-situ Joule heating effect by applying an electric current to the electrothermal coupling catalytic layer. The electrothermal coupling catalytic layer self-heats to reach the thermal catalytic reaction temperature. At the same time, the current also forms an electric field to cause the active sites of the electrothermal coupling catalytic layer to produce an electrocatalytic effect, thereby achieving electrothermal synergistic catalysis and decomposing the oil fume mixture into CO2 and H2O. Multiple catalytic layers increase the contact area between the oil fume mixture and the catalyst, thereby improving the oil fume removal efficiency and reducing the oil fume escape rate.

[0032] 2. By setting up the oil fume concentration detection unit and the main controller, the speed of the fan and the current input to the electrothermal coupling catalytic layer are adjusted in real time according to the oil fume concentration, so as to adjust the kitchen fume purification power, which is conducive to reducing energy consumption while ensuring the purification effect;

[0033] 3. This application adopts a modular design with small size and simple structure, and is suitable for a variety of equipment such as range hoods, ventilation fans, (steam) ovens and microwave ovens. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the process of the catalytic reaction module in the embodiment of the present application;

[0035] Figure 2 It is a schematic diagram of the assembly of the catalytic reaction module in the embodiment of the present application.

[0036] Figure numerals: 1. Shell; 2. Air inlet flange and flow channel; 3. Air inlet screen; 4. Electrothermal coupling catalytic layer; 5. Air outlet screen; 6. End electrode; 7. Adjustment knob; 8. Air outlet flange and flow channel; 9. Fan; 10. Oil fume concentration sensor; 11. Temperature sensor. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-2 This application is described in further detail.

[0038] The present application discloses an electrothermal catalytic purification kitchen smoke treatment device. Figure 1 and Figure 2 The electrothermal catalytic purification kitchen smoke treatment device includes a catalytic reaction module and a control function module. The catalytic reaction module includes a shell 1 and a plurality of electrothermal coupled catalytic layers 4 arranged in the shell 1. The shell 1 is provided with an air inlet end and an air outlet end. The air inlet end is connected with an air inlet flange and a flow channel 2. The air outlet end is connected with an air outlet flange and a flow channel 8. The air outlet end of the air outlet flange and the flow channel 8 is equipped with a variable frequency fan 9.

[0039] Reference Figure 1 and Figure 2 In this embodiment, three electrothermal coupling catalytic layers 4 are provided, and the three electrothermal coupling catalytic layers 4 are arranged in sequence along the gas flow direction in the shell 1. The electrothermal coupling catalytic layer 4 is a porous conductive layer loaded with a three-dimensional metal skeleton catalyst; the three-dimensional metal skeleton catalyst is a nickel-iron-based three-dimensional metal skeleton catalyst with electrothermal catalysis. The catalytic reaction module also includes a current regulating unit. Specifically, the current regulating unit includes an end electrode 6 connected to both ends of the electrothermal coupling catalytic layer 4, and the end electrode 6 is used to input current into the electrothermal coupling catalytic layer 4.

[0040] The control function module includes an oil fume concentration detection unit and a main controller. The oil fume concentration detection unit is used to detect the oil fume concentration at the air inlet and the air outlet; the main controller is electrically connected to the oil fume concentration detection unit and is used to adjust the speed of the fan 9 and the current input to the electrothermal coupling catalytic layer 4 according to the oil fume concentration at the air inlet.

[0041] When the fan 9 is started, the oil fume mixture enters the housing 1 through the air inlet flange and the flow channel 2. After being catalytically decomposed by the electrothermal coupling catalyst layer 4, the oil fume mixture is converted into oil fume-free gas and discharged through the fan 9. In this process, the terminal electrode 6 inputs current into the electrothermal coupling catalyst layer 4, and the electrothermal coupling catalyst layer 4 self-heats to reach the thermal catalytic reaction temperature; at the same time, the current also forms an electric field to promote the active sites of the electrothermal coupling catalyst layer 4 to produce an electrocatalytic effect, realizing electrothermal synergistic catalysis, and decomposing the oil fume mixture into CO2 and H2O. In addition, the electrocatalytic effect can also enhance the inhibition of carbon deposition, thereby helping to improve the stability of kitchen smoke purification and extend the life of the catalyst.

[0042] The nickel-iron-based three-dimensional metal skeleton catalyst has a large catalytic reaction area and high activity. The catalyst heats up quickly, with a heating rate of up to 100°C / s, and the temperature distribution is uniform, which can effectively avoid the problem of catalyst deactivation caused by local "hot spots". The catalytic layer is heated in situ by electricity, without the need for an external heat source, which reduces energy loss and energy consumption. Multiple catalytic layers increase the contact area and contact time between the oil fume mixture and the catalyst, thereby improving the oil fume removal efficiency and reducing the oil fume escape rate.

[0043] The oil fume concentration detection unit detects the oil fume concentration at the air inlet and outlet ends. The main controller adjusts the rotation speed of the fan 9 and the current input to the electrothermal coupling catalytic layer 4 according to the oil fume concentration at the air inlet, thereby adjusting the heating temperature of the electrothermal coupling catalytic layer 4 and the electric field strength on the active sites of the built-in catalyst, thereby realizing the adjustment of the kitchen fume purification power, which is beneficial to reducing energy consumption while ensuring the purification effect.

[0044] Reference Figure 1 and Figure 2 An air inlet screen 3 is provided on one side of the housing 1 near the air inlet end, and the air inlet screen 3 is conducive to the oil smoke mixed gas entering the catalyst layer evenly. An air outlet screen 5 is provided on one side of the housing 1 near the air outlet end, and the air outlet screen 5 helps to slow down the gas flow rate, so that the smoke can fully contact the electric and thermal coupling catalyst layer 4, thereby improving the oil smoke removal efficiency.

[0045] Further, refer to Figure 2 The air inlet flange and flow channel 2 and the air outlet flange and flow channel 8 are diagonally distributed on both sides of the shell 1, which can extend the flow path of the flue gas in the shell 1, so that the flue gas can fully contact with the electrothermal coupling catalytic layer 4, thereby further improving the oil fume removal efficiency.

[0046] Reference Figure 1 The oil fume concentration detection unit includes two oil fume concentration sensors 10, one of which is disposed at the air inlet flange and the air inlet end of the flow channel 2, and the other oil fume concentration sensor 10 is disposed between the housing 1 and the air outlet flange and the flow channel 8. Both oil fume concentration sensors 10 are electrically connected to the main controller. Further, the fan 9 is electrically connected to the main controller, and the terminal electrode 6 is electrically connected to the main controller.

[0047] In a feasible embodiment, two end electrodes 6 are respectively connected to each electrothermal coupling catalytic layer 4, so that the current in each electrothermal coupling catalytic layer 4 can be individually controlled; when the current in the electrothermal coupling catalytic layer 4 is zero, the electrothermal coupling catalytic layer 4 does not work, thereby enabling the adjustment of the number of working layers of the catalytic layer and the independent adjustment of the working temperature of each catalytic layer.

[0048] The present application can adopt automatic or manual mode. In automatic mode, the oil fume concentration sensor 10 detects the oil fume concentration at the air inlet and outlet at regular intervals, for example, once every 5 seconds or 10 seconds. The oil fume concentration sensor 10 converts the oil fume concentration at the air inlet into an electrical signal and sends it to the main controller. The main controller obtains the oil fume concentration and compares it with the set start threshold. When the oil fume concentration at the air inlet is greater than the start threshold, the main controller sends a signal to the fan 9 and the end electrode 6, and the fan 9 and the electrothermal coupling catalytic layer 4 start working.

[0049] According to the different oil smoke concentrations at the air intake end, the speed of the fan 9 and the different gears of the current of the electrothermal coupling catalytic layer 4, as well as the number of layers of the electrothermal coupling catalytic layer 4 involved in the work, are set. Specifically, in a feasible implementation, three different gears of high, medium and low can be set, corresponding to the high concentration, medium concentration and low concentration of oil smoke at the air intake end, respectively. In the high gear, the fan 9 runs at a high speed, the number of working layers of the electrothermal coupling catalytic layer 4 is three layers, and the current value in the electrothermal coupling catalytic layer 4 is a large current; in the medium gear, the fan 9 runs at a medium speed, the number of working layers of the electrothermal coupling catalytic layer 4 is two layers, and the current value in the electrothermal coupling catalytic layer 4 is a medium current; in the low gear, the fan 9 runs at a low speed, the number of working layers of the electrothermal coupling catalytic layer 4 is one layer, and the current value in the electrothermal coupling catalytic layer 4 is a small current.

[0050] The oil fume concentration sensor 10 detects the oil fume concentration at the air inlet and the air outlet at regular intervals. The oil fume concentration sensor 10 converts the oil fume concentration at the air inlet into an electrical signal and sends it to the main controller. The main controller obtains the oil fume concentration and compares it with the oil fume concentration setting value of each gear. When the oil fume concentration at the air inlet reaches the setting value of a certain gear, the main controller sends a signal to the fan 9 and the terminal electrode 6, and the fan 9 and the electrothermal coupling catalytic layer 4 work according to the corresponding setting gear. In this way, the speed of the fan 9, the catalytic layer current, and the number of working catalytic layers are automatically adjusted to maintain the catalytic temperature and ensure the purification effect.

[0051] When the oil smoke concentration at the air intake end is lower than the startup threshold, the system will shut down after a delay of 5 minutes.

[0052] Reference Figure 1 and Figure 2 The end electrode 6 is connected to an adjusting knob 7 for adjusting the current input into the electrothermal coupling catalytic layer 4 .

[0053] In manual mode, the current input to the electrothermal coupling catalytic layer 4 can be adjusted by adjusting the knob 7, thereby adjusting the heating temperature of the electrothermal coupling catalytic layer 4 and the electric field strength on the active site of the built-in catalyst, thereby adjusting the kitchen smoke purification power; in manual mode, the speed of the fan 9 can also be manually adjusted.

[0054] Reference Figure 1 and Figure 2 A temperature sensor 11 is provided in the housing 1, and the temperature sensor 11 can monitor the temperature in the housing 1 to ensure that the temperature in the housing 1 reaches the thermal catalytic reaction temperature. In another embodiment, a temperature sensor 11 can also be provided beside each electrothermal coupling catalyst layer 4, so as to monitor the temperature of the electrothermal coupling catalyst layer 4 in real time to ensure that the temperature of the working electrothermal coupling catalyst layer 4 reaches the thermal catalytic reaction temperature.

[0055] The device provided by the present application is small in size and simple in structure, and is suitable for a variety of appliances such as range hoods, ventilation fans, (steam) ovens and microwave ovens.

[0056] The implementation principle of the electrothermal catalytic purification kitchen fume treatment device of the present application embodiment is as follows: when the fan 9 is started, the oil fume mixture enters the housing 1 from the air inlet end, and is discharged from the air outlet end after being catalytically decomposed by multiple electrothermal coupling catalytic layers 4. In this process, the terminal electrode 6 inputs current into the electrothermal coupling catalytic layer 4, and the electrothermal coupling catalytic layer 4 self-heats to reach the thermal catalytic reaction temperature; at the same time, the current also forms an electric field to prompt the active sites of the electrothermal coupling catalytic layer 4 to produce an electrocatalytic effect, thereby realizing electrothermal synergistic catalysis and decomposing the oil fume mixture into CO2 and H2O.

[0057] The oil fume concentration sensor 10 detects the oil fume concentration at the air inlet and air outlet. The main controller adjusts the speed of the fan 9, the current input to the electrothermal coupling catalytic layer 4, and the number of layers of the electrothermal coupling catalytic layer 4 involved in the work according to the oil fume concentration at the air inlet, thereby realizing the adjustment of the kitchen fume purification power, which is beneficial to reducing energy consumption while ensuring the purification effect.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electrothermal catalytic purification kitchen smoke treatment device, characterized in that: It includes a catalytic reaction module and a control function module; Wherein, the catalytic reaction module comprises: A housing, wherein an air inlet and an air outlet are provided on the housing, and a fan is provided on the air outlet; A plurality of electrothermal coupling catalytic layers are arranged in sequence in the shell along the gas flow direction, wherein the electrothermal coupling catalytic layers are porous conductive layers loaded with three-dimensional metal skeleton catalysts; A current regulating unit, used for inputting current into the electrothermal coupling catalytic layer; The control function module includes: An oil fume concentration detection unit, used to detect the oil fume concentration at the air inlet and the air outlet; The main controller is electrically connected to the oil fume concentration detection unit and is used to adjust the rotation speed of the fan and the current input to the electrothermal coupling catalytic layer according to the oil fume concentration at the air inlet end.

2. The electrothermal catalytic purification kitchen smoke treatment device according to claim 1, characterized in that: The current regulating unit includes terminal electrodes connected to both ends of the electrothermal coupling catalytic layer.

3. The electrothermal catalytic purification kitchen smoke treatment device according to claim 1, characterized in that: An air intake screen is arranged on one side of the shell body close to the air intake end.

4. The electrothermal catalytic purification kitchen smoke treatment device according to claim 1, characterized in that: An air outlet screen is arranged on one side of the shell body close to the air outlet end.

5. The electrothermal catalytic purification kitchen smoke treatment device according to claim 2, characterized in that: The fan is a variable frequency fan.

6. The electrothermal catalytic purification kitchen smoke treatment device according to claim 5, characterized in that: The oil fume concentration detection unit includes two oil fume concentration sensors, which are respectively arranged at the air inlet end and the air outlet end of the shell, and the oil fume concentration sensors are electrically connected to the main controller.

7. The electrothermal catalytic purification kitchen smoke treatment device according to claim 6, characterized in that: The fan is electrically connected to the main controller.

8. The electrothermal catalytic purification kitchen smoke treatment device according to claim 7, characterized in that: The terminal electrode is electrically connected to the main controller.

9. The electrothermal catalytic purification kitchen smoke treatment device according to claim 2, characterized in that: The end electrode is connected with an adjustment knob for adjusting the current input into the electrothermal coupling catalytic layer.

10. The electrothermal catalytic purification kitchen smoke treatment device according to claim 1, characterized in that: A temperature sensor is arranged in the shell.

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