A volatile organic matter purification system for restaurant fume

Abstract

The present invention provides a volatile organic matter purification system for cooking fume for a stove head, comprising a fume collecting hood, a fume separator, a first circulation fan, a second circulation fan, and a VOC purifier. The fume collecting hood has a built-in fume separator for collecting and separating fume, purifying fume and particulate matter to obtain fume waste gas. The VOC purifier comprises an activated carbon adsorption column for adsorbing VOC in the fume, switching to desorption after adsorption saturation, cooling and regeneration for recycling, and the desorbed VOC-rich waste gas is guided into the stove by the second fan for combustion treatment. The system can efficiently treat volatile organic components in fume, and fully utilize the stove gas combustion to treat 100% of the VOC waste gas in the gas, without the need for additional auxiliary gas, and is economical and practical.

Description

Technical Field

[0001] The invention relates to the technical field of restaurant fume air pollutant control and energy saving and emission reduction, and in particular to a restaurant fume volatile organic matter purification system. Background Art

[0002] Restaurant fumes are one of the important sources of air pollution. Restaurant fumes refer to the oil smoke produced by chemical reactions of edible oil during the cooking process. It contains a variety of toxic chemical components. Restaurant fumes are one of the important sources of PM in the atmospheric environment. Its emissions are large in quantity, wide in scope, and highly dispersed. It not only increases the generation of haze, but also endangers human health. Recently, many provinces and cities, including Beijing, have issued VOC emission standards for restaurant fumes. It is of great significance to control its emissions.

[0003] At present, the main oil fume treatment technologies include electrostatic adsorption, UV photolysis, alkali solution spraying, activated carbon adsorption, and combustion. Among them, electrostatic adsorption, UV photolysis, and alkali solution spraying technologies have low purification efficiency for oil fume VOC and cannot meet VOC emission standards; activated carbon adsorption technology has the problem of adsorption saturation and high operation and maintenance costs; combustion technology has a better purification effect on oil fume VOC, but there are still some problems. For example, in patent CN200710061664.9, part of the oil fume enters the gas hood for direct combustion, and part of the oil fume is diverted and refluxed before entering the gas hood for combustion. Since the oil fume entering the gas hood has a certain proportion limit, the following contradictions cannot be solved: the contradiction between the increase in air volume required to collect all the fume and the insufficient speed of combustion to remove the collected oil fume; and Patent CN201910331750.X adopts the method of allowing part of the oil fume to enter the gas hood for direct combustion, and part of the oil fume to undergo catalytic combustion. The problem with this patent is that on the one hand, the operating and maintenance cost of the catalyst is too high, and on the other hand, the catalytic combustion chamber must be large enough due to the certain residence time required for catalytic combustion, which leads to an increase in the cost of the system. For example, patent CN201711310721.2 adopts honeycomb porous materials for combustion, which has the same problem, that is, sufficient combustion time is required to ensure the combustion efficiency of the oil fume, and the contradiction between the smoke collection speed (the air volume determines the speed, and the speed determines the residence time) and the combustion time cannot be resolved. Summary of the invention

[0004] The present invention provides a volatile organic matter purification system for restaurant fume, which is used to solve the contradiction between the increased air volume required for collecting all the fume and the insufficient speed of burning and removing the collected fume, the high maintenance cost, and the inability to solve the contradiction between the fume collection speed and the combustion time.

[0005] A volatile organic matter purification system for restaurant fume, used for a stove, characterized by comprising:

[0006] Oil fume collecting hood: used to collect oil fume from indoor stoves, with a built-in oil fume separator to separate and filter the oil fume;

[0007] The first circulation fan is used to transport oil smoke, and its air inlet is connected to the output end of the oil smoke collecting hood;

[0008] VOC purifier: including activated carbon adsorption column and heater, among which,

[0009] There are at least three activated carbon adsorption columns, which can have adsorption, desorption and cooling functions in the same cycle respectively. The activated carbon adsorption column with adsorption and cooling functions is connected to the air outlet of the first circulation fan, wherein the activated carbon adsorption column with adsorption and cooling functions is connected to the air outlet of the first circulation fan and is also provided with a flow control valve for controlling the flow of oil smoke entering;

[0010] The second circulating fan: its air inlet is connected to the activated carbon adsorption column with desorption function, and its air outlet is connected to the air inlet of the stove head, so as to burn the oil fume waste gas purified by the VOC purifier;

[0011] Intelligent controller: used to control the oil fume hood, the first circulation fan, the VOC purifier and the second circulation fan, and electrically connected to the oil fume hood, the first circulation fan, the VOC purifier and the second circulation fan.

[0012] Further: the oil fume separator separates the filter screen and the oil fume filter assembly, wherein,

[0013] The separation filter is used to filter particulate matter in the oil smoke;

[0014] The filter assembly is used for purifying oil smoke and extracting volatile organic matter from the oil smoke.

[0015] Further: the number of the activated carbon adsorption columns is at least three, including: a first activated carbon adsorption column, a second activated carbon adsorption column and a third activated carbon adsorption column, and the initial functions of the first activated carbon adsorption column, the second activated carbon adsorption column and the third activated carbon adsorption column are different in the same cycle, wherein:

[0016] The initial functions include: adsorption function, desorption function and cooling function;

[0017] In the same cycle:

[0018] After the first activated carbon adsorption column is saturated with oil fume adsorption, the first activated carbon adsorption column performs thermal desorption on the oil fume; after the desorption is completed, the first activated carbon adsorption column is cooled; after the cooling is completed, the first activated carbon adsorption column starts to adsorb oil fume again;

[0019] The second activated carbon adsorption column thermally desorbs the oil fume; when the desorption is completed, the second activated carbon adsorption column is cooled; when the cooling is completed, the second activated carbon adsorption column starts to adsorb the oil fume; when the adsorption is saturated, the second activated carbon adsorption column starts to thermally desorb the oil fume again;

[0020] The third activated carbon adsorption column cools the oil fume. After the cooling is completed, the third activated carbon adsorption column starts to adsorb the oil fume. When the adsorption is saturated, the third activated carbon adsorption column performs thermal desorption on the oil fume. After the thermal desorption is completed, the third activated carbon adsorption column starts to cool again.

[0021] Further: the activated carbon adsorption column is switched to perform the following steps:

[0022] Dividing the surface area of ​​the activated carbon adsorption column into N sub-areas, and obtaining data related to the oil fume input rate in the sub-areas to determine the saturation conversion coefficient of the activated carbon adsorption column;

[0023]

[0024] Wherein, λ is the saturation conversion coefficient of the activated carbon adsorption column, S is the sum of the total sub-areas, P i is the oil smoke input rate of the ith sub-area, F i is the oil smoke volume of the i-th sub-area, i=1, 2, 3...N;

[0025] The activated carbon adsorption column saturation conversion coefficient is used to obtain the input rate of the activated carbon adsorption column input port in real time, thereby obtaining the real-time oil fume adsorption saturation;

[0026]

[0027] Among them, Pf t is the oil fume adsorption saturation on the activated carbon adsorption column at the t moment, Sf is the available area of ​​the activated carbon adsorption column, and Int is the oil fume input rate of the activated carbon adsorption column at the t moment;

[0028] Get Pf t Real-time data, when Pf t When it is 1, the saturation of the activated carbon adsorption column reaches 100%, and the switching step is performed.

[0029] Further: the heater is used to perform a thermal desorption function, wherein,

[0030] The air inlet of the heater is connected to the activated carbon adsorption column which is used for cooling at that time, and the air outlet is connected to the activated carbon adsorption column which is used for desorption at that time, so as to realize the thermal desorption function.

[0031] Further: the intelligent controller includes: a CPU processor, a power supply control module, a fume hood control module, a first fan control module, a VOC control module, and a second fan control module, wherein the CPU processor is electrically connected to the source control module, the flow control valve, the fume hood control module, the first fan control module, the VOC control module, and the second fan control module, wherein:

[0032] The power management and control module is used to control the power supply and is electrically connected to the power bus;

[0033] The oil fume hood control module is used to control the operation of the oil fume hood, and to control the air collection rate and the volatile organic matter extraction rate;

[0034] The first fan control module and the second fan control module are used to control the operation speed and operation time of the first circulation fan and the second circulation fan;

[0035] The VOC control module includes an activated carbon adsorption column control unit and a heater control unit, wherein:

[0036] The activated carbon adsorption column control unit is used to control the switching, transmission and introduction rate of the activated carbon adsorption column;

[0037] The heater control unit is used to control the efficiency of heat flow introduction into the activated carbon adsorption column with degreasing function, thereby controlling the degreasing efficiency;

[0038] The CPU processor is also electrically connected to the flow control valve to control the rate at which oil smoke is introduced into the VOC purifier.

[0039] Further: the oil fume collecting hood is electrically connected to a power bus through the first circulating fan, the VOC purifier and the second circulating fan, wherein:

[0040] The oil fume collecting hood is equipped with a first motor, the first circulating fan is equipped with a second motor, the second circulating fan is equipped with a third motor, the heater is equipped with a heating element, the first motor, the second motor and the third motor are respectively equipped with a first switch group, a second switch group and a third switch group, wherein,

[0041] The first motor is directly connected to the power supply, wherein a first fuse is provided at the connection between the first motor and the live wire;

[0042] The second motor, the third motor and the heating element are connected in parallel to a power source, wherein:

[0043] A second fuse is provided at the connection between the second motor, the third motor and the heating element and the live wire;

[0044] A time relay is connected between the third motor and the second fuse;

[0045] A first control switch and a third fuse are provided between the heating element input end and the second fuse output end, the heating element output end is connected to a digital rheostat, the digital rheostat output end is connected to a control relay, and the control relay output end is connected to a second control switch.

[0046] Further: the air collecting hood control module is electrically connected to the first switch group;

[0047] The first fan control module is electrically connected to the second switch group, and the second fan control module is electrically connected to the third switch group and the time relay;

[0048] The heater control unit is electrically connected to the first control switch, the digital rheostat, the control relay, and the second control switch.

[0049] The beneficial effect is that the harmful VOCs in the oil fume can be adsorbed-desorbed-re-adsorbed online by cheap activated carbon, so that the activated carbon can be reused, which can fully ensure the removal of harmful VOCs in the oil fume and reduce the operation and maintenance costs of the system;

[0050] The harmful VOC in the oil fume is burned in the stove, so there is no need to set up a combustion chamber and combustion-aiding gas, saving equipment space and operating costs;

[0051] The thermal desorption flow rate of the invented system is controllable, and the harmful VOCs in the oil fume concentrated by the activated carbon adsorption column can be desorbed and introduced into the stove head for combustion at a suitable air supply speed, so that 100% of the VOCs in the oil fume exhaust gas can be safely and efficiently treated;

[0052] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0053] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0055] In the attached picture:

[0056] Figure 1A system schematic diagram of the overall processing flow of an embodiment of the present invention;

[0057] Figure 2 A structural diagram of an implementation of an embodiment of the present invention;

[0058] Figure 3 A motor control principle diagram of an embodiment of the present invention;

[0059] Figure 4 A system control principle diagram of an embodiment of the present invention;

[0060] Description of reference numerals:

[0061] 1 is a stove head, 2 is a fume collecting hood, 21 is a separation filter, 22 is a filter assembly, 3 is a first circulation fan, 4 is a VOC purifier, 41 is a first activated carbon adsorption column, 42 is a second activated carbon adsorption column, 43 is a third activated carbon adsorption column, 5 is a heater, 6 is a second circulation fan, and 7 is a flow control valve. DETAILED DESCRIPTION

[0062] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0063] As an embodiment of the present invention, Figure 1 System schematic diagram and attached diagram of the overall processing flow Figure 2 As shown in the implementation structure diagram: a volatile organic compound purification system for restaurant oil fume, used for a stove head 1, characterized in that it includes: an oil fume collecting hood 2, used to collect oil fume on the indoor stove, which has a built-in oil fume separator for oil fume separation and filtration. A first circulating fan 3, used to transport oil fume, and its air inlet is connected to the output end of the oil fume collecting hood 2; a VOC purifier 4, including an activated carbon adsorption column and a heater 5, wherein the activated carbon adsorption columns are at least 3, which can have adsorption, desorption and cooling functions in the same cycle, respectively, and the activated carbon adsorption column with adsorption and cooling functions is connected to the air outlet of the first circulating fan 2, wherein the activated carbon adsorption column with adsorption and cooling functions is connected to the air outlet of the first circulating fan 2, and a flow control valve 7 is also provided to control the flow of incoming oil fume;

[0064] The second circulation fan 6, whose air inlet is connected to the activated carbon adsorption column with a desorption function, and whose air outlet is connected to the air inlet of the stove head 1, burns the oil fume waste gas purified by the VOC purifier 4;

[0065] The intelligent controller is used to control the oil fume hood 2, the first circulation fan 3, the VOC purifier 4 and the second circulation fan 6, and is electrically connected to the oil fume hood 2, the first circulation fan 3, the VOC purifier 4 and the second circulation fan 6.

[0066] The present invention absorbs the oil smoke on the stove head 1 through the range hood 2, separates it, removes particulate matter, and desorbs the VOC in the oil smoke enriched after adsorption through the first circulation fan 3 after separation and adsorption of the collected oil smoke. Specifically, the rate at which the oil smoke enters the VOC purifier is controlled by the flow control valve 5, and then the VOC-rich gas is desorbed by the heater as the gas stove mixed air and enters the gas stove for combustion treatment. The VOC components in the oil smoke are decomposed into water and carbon dioxide through combustion, and the oil smoke exhaust gas is purified and discharged.

[0067] The beneficial effects of the present invention are:

[0068] The harmful VOCs in the oil fume can be subjected to online adsorption-desorption-re-adsorption cycles with cheap activated carbon, so that the activated carbon can be reused, which can fully ensure that the harmful VOCs in the oil fume are removed while reducing the operation and maintenance costs of the system;

[0069] The harmful VOC in the oil fume is burned in the stove, so there is no need to set up a combustion chamber and combustion-aiding gas, saving equipment space and operating costs;

[0070] The thermal desorption flow rate of the invented system is controllable. It can desorb harmful VOCs in the oil fume concentrated by the activated carbon adsorption column and then introduce them into the stove for combustion at a suitable air supply speed, thereby achieving 100% safe and efficient treatment of VOCs in the oil fume exhaust gas.

[0071] As an embodiment of the present invention: the oil fume separator separates the filter screen 21 and the oil fume filter assembly 22, wherein:

[0072] The separation filter 21 is used to filter particulate matter in the oil smoke;

[0073] The filter assembly 22 is used for purifying oil smoke and removing volatile organic matter from the oil smoke.

[0074] The principle of the present invention is to purify the oil fume through the filter 21 to discharge the particulate matter, and then discharge the particulate matter through the filter component 22 and transport the volatile organic matter in the oil fume to the VOC purifier 4 through the first circulation fan 3.

[0075] The beneficial effect of this embodiment is that the present invention discharges the particulate matter in the oil smoke through the early filtering process, preventing the particulate matter from affecting the later adsorption, desorption and cooling process. By filtering out other impurities, volatile organic matter can be better processed.

[0076] As an embodiment of the present invention: the number of the activated carbon adsorption columns is at least three, including: a first activated carbon adsorption column 41, a second activated carbon adsorption column 42 and a third activated carbon adsorption column 43. In the same cycle, the initial functions of the first activated carbon adsorption column 41, the second activated carbon adsorption column 42 and the third activated carbon adsorption column 43 are different, wherein:

[0077] The initial functions include: adsorption function, desorption function and cooling function;

[0078] In the same cycle:

[0079] After the first activated carbon adsorption column 41 is saturated with oil fume adsorption, the first activated carbon adsorption column 41 performs thermal desorption of the oil fume; after the desorption is completed, the first activated carbon adsorption column 41 is cooled; after the cooling is completed, the first activated carbon adsorption column 41 starts to adsorb the oil fume again;

[0080] The second activated carbon adsorption column 42 thermally desorbs the oil fume; when the desorption is completed, the second activated carbon adsorption column 42 is cooled; when the cooling is completed, the second activated carbon adsorption column 42 starts to adsorb the oil fume; when the adsorption is saturated, the second activated carbon adsorption column 42 starts to thermally desorb the oil fume again;

[0081] The third activated carbon adsorption column 43 cools the oil fume. After the cooling is completed, the third activated carbon adsorption column 43 starts to adsorb the oil fume. When the adsorption is saturated, the third activated carbon adsorption column 41 performs thermal desorption on the oil fume. After the thermal desorption is completed, the third activated carbon adsorption column 41 starts to cool again.

[0082] As an embodiment of the present invention: the activated carbon adsorption column is switched to perform the following steps: dividing the surface area of ​​the activated carbon adsorption column into N sub-areas, and obtaining the oil fume input rate related data in the sub-areas to determine the saturation conversion coefficient of the activated carbon adsorption column;

[0083]

[0084] Wherein, λ is the saturation conversion coefficient of the activated carbon adsorption column, S is the sum of the total sub-areas, P i is the oil smoke input rate of the ith sub-area, F i is the oil smoke volume of the i-th sub-area, i=1, 2, 3...N;

[0085] The activated carbon adsorption column saturation conversion coefficient is used to obtain the input rate of the activated carbon adsorption column input port in real time, thereby obtaining the real-time oil fume adsorption saturation;

[0086]

[0087] Among them, Pf t is the oil fume adsorption saturation on the activated carbon adsorption column at the t moment, Sf is the available area of ​​the activated carbon adsorption column, and Int is the oil fume input rate of the activated carbon adsorption column at the t moment;

[0088] Get Pf t Real-time data, when Pf t When it is 1, the saturation of the activated carbon adsorption column reaches 100%, and the switching step is performed.

[0089] The beneficial effect of the present invention is that the above technology can automatically execute the step of switching to another functional activated carbon adsorption column according to the saturation of the activated carbon adsorption column, and the saturation of activated carbon adsorption can be monitored in real time.

[0090] This embodiment follows a cyclic desorption, adsorption and cooling process, and the three activated carbon adsorption columns, namely the first activated carbon adsorption column 41, the second activated carbon adsorption column 42 and the third activated carbon adsorption column 43, are continuously circulated, so that the volatile organic compounds can be effectively removed from the harmful volatile organic compounds during the adsorption, cooling and desorption process.

[0091] The beneficial effects of this embodiment are: volatile organic compounds can be removed during the circulation process, the entire circulation process can effectively reduce the maintenance cost of system operation, and the entire circulation process can also increase the efficiency of removing harmful volatile organic compounds.

[0092] As an embodiment of the present invention: the heater 5 is used to perform a thermal desorption function, wherein:

[0093] The air inlet of the heater 5 is connected to the activated carbon adsorption column used for cooling at the time, and the air outlet is connected to the activated carbon adsorption column used for desorption at the time, so as to realize the thermal desorption function.

[0094] The heater 5 uses the principle of heating desorption to control the rate at which the heat flow enters the desorption activated carbon adsorption column to perform desorption treatment of volatile organic compounds.

[0095] The beneficial effect of this embodiment is that the efficiency of heat flow is adjusted by the heater 5, so as to achieve efficiency control and time control during the desorption process.

[0096] As an embodiment of the present invention, Figure 4A module control diagram of the present invention is shown: the intelligent controller includes a CPU processor, a power supply control module, a fume hood control module, a first fan control module, a VOC control module, and a second fan control module, the CPU processor is electrically connected to the source control module, the flow control valve (7), the fume hood control module, the first fan control module, the VOC control module, and the second fan control module, wherein:

[0097] The power management and control module is used to control the power supply and is electrically connected to the power bus;

[0098] The oil fume hood control module is used to control the operation of the oil fume hood 2, and control the air collection rate and the volatile organic matter extraction rate;

[0099] The first fan control module and the second fan control module are used to control the operation speed and operation time of the first circulation fan 3 and the second circulation fan 6;

[0100] The VOC control module includes an activated carbon adsorption column control unit and a heater control unit, wherein:

[0101] The activated carbon adsorption column control unit is used to control the switching, transmission and introduction rate of the activated carbon adsorption column;

[0102] The heater control unit is used to control the efficiency of heat flow introduction into the activated carbon adsorption column with degreasing function, thereby controlling the degreasing efficiency;

[0103] The CPU processor is also electrically connected to the flow control valve to control the rate at which the oil smoke is introduced into the VOC purifier 4 .

[0104] The present invention uses an intelligent controller to globally process the entire purification process. The power output is controlled by the power bus. The control module controls the operating speed of the motor and the desorption purification rate of the heater for each module during the operation process. The CPU handles the start-up and rate control of the motor, heat flow control and introduction rate during the entire purification process, and finally introduces it into the stove head.

[0105] The beneficial effects of this embodiment are as follows: the present invention uses the CPU to perform module control, data processing and the operating speed of the motors in each part, the conversion rate of the activated carbon adsorption column and the introduction rate of oil smoke, which can ensure the accuracy of the operating speed and conversion rate of each part.

[0106] As an embodiment of the present invention, Figure 3 A motor principle control diagram shown: the fume collecting hood 2, the first circulating fan 3, the VOC purifier 4 and the second circulating fan 6 are electrically connected to the power bus, wherein,

[0107] The oil fume collecting hood is equipped with a first motor M1, the first circulating fan is equipped with a second motor M2, the second circulating fan is equipped with a third motor M3, and the heater is equipped with a heating element A, wherein:

[0108] The first motor M1 is directly connected to the power supply, wherein a first fuse FU1 is provided at the connection between the first motor M1 and the live wire;

[0109] The second motor M2, the third motor M3 and the heating element A are connected in parallel to a power supply, wherein:

[0110] A second fuse FU2 is provided at the connection between the second motor M2, the third motor M3 and the heating element A and the live wire;

[0111] A time relay KM1 is connected between the third motor M3 and the second fuse FU2;

[0112] A first control switch K1 and a third fuse FU3 are provided between the input end of the heating element A and the output end of the second fuse FU2. The output end of the heating element A is connected to a digital rheostat RS. The output end of the digital rheostat RS is connected to a control relay KM2. The output end of the control relay KM2 is connected to a second control switch K2.

[0113] This embodiment realizes the rational operation of each part of the present invention through the control of motors, relays, and switches. The first motor M1 controls the oil fume intake rate of the range hood 2, the second motor M2 controls the suction and removal rate of volatile organic matter in the first circulation wind, and the third motor M3 controls the suction and removal rate of volatile organic matter after desorption by the third circulation fan. The heating element A and the digital rheostat RS control the heat flow rate during the thermal desorption process, thereby controlling the desorption rate.

[0114] The beneficial effect of this embodiment is that the present invention realizes standard control of motor start and stop and speed through motor control, complies with the safety control process, and the control of the motor complies with the motor control standard.

[0115] As an embodiment of the present invention:

[0116] The first motor (M1), the second motor (M2) and the third motor (M3) are respectively equipped with a first switch group (KS1), a second switch group (KS2) and a third switch group (KS3);

[0117] The gas collecting hood control module is electrically connected to the first switch group KS1;

[0118] The first fan control module is electrically connected to the second switch group KS2, and the second fan control module is electrically connected to the third switch group KS3 and the time relay KM1;

[0119] The heater control unit is electrically connected to the first control switch K1 , the digital rheostat RS, the control relay KM2 , and the second control switch K2 .

[0120] The control principle of this embodiment is to realize the precise control of the start and stop of each component, realize the precise control of cost, and reduce investment by controlling the on and off of each relay and switch in the circuit of the intelligent processing controller and the change of the parameters of the control relay KM2 and the digital rheostat RS.

[0121] The beneficial effects of this embodiment are: the time parameters can be set by the time relay KM1 in the present invention to control the second circulation fan 6 to start after the first circulation fan 3 is started to save energy; the digital rheostat RS and the control relay KM2 can control the change of heat flow through the change of resistance, thereby controlling the desorption efficiency and saving energy.

[0122] The beneficial effect of this embodiment is that this embodiment realizes precise cost control and reduces cost investment through intelligent control of relays, digital rheostats RS and switches, so that in the whole process, in addition to the desorption of harmful VOCs in the oil fume concentrated by the activated carbon adsorption column, it is introduced into the stove head for combustion at a suitable air supply speed, so that 100% of the VOCs in the oil fume exhaust gas can be safely and efficiently treated.

[0123] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A volatile organic matter purification system for restaurant fume, used for a stove (1), characterized in that: include: Oil fume collecting hood (2): used to collect oil fume from the indoor stove, and having a built-in oil fume separator, which is used to separate and filter the oil fume; A first circulation fan (3): used for conveying oil smoke, with its air inlet connected to the output end of the oil smoke collecting hood; VOC purifier (4): comprising an activated carbon adsorption column and a heater (5), wherein: There are at least three activated carbon adsorption columns, which respectively have adsorption, desorption and cooling functions in the same cycle, and the activated carbon adsorption column with adsorption and cooling functions is connected to the air outlet of the first circulation fan (3), wherein the activated carbon adsorption column with adsorption and cooling functions is connected to the air outlet of the first circulation fan (3), and the air outlet of the first circulation fan (3) is also provided with a flow control valve (7) for controlling the flow of oil smoke entering; The heater (5) is connected to the activated carbon adsorption column for performing a thermal desorption function; A second circulating fan (6), whose air inlet is connected to the activated carbon adsorption column having a desorption function, and whose air outlet is connected to the air inlet of the stove head (1), for burning the oil fume waste gas purified by the activated carbon adsorption column; An intelligent controller: used for controlling the oil fume hood (2), the first circulating fan (3), the VOC purifier (4) and the second circulating fan (6), and electrically connected to the oil fume hood (2), the first circulating fan (3), the VOC purifier (4) and the second circulating fan (6); The intelligent controller comprises: a CPU processor, a power management and control module, a fume hood control module, a first fan control module, a VOC control module, and a second fan control module, wherein the CPU processor is electrically connected to the power management and control module, the flow control valve (7), the fume hood control module, the first fan control module, the VOC control module, and the second fan control module, wherein: The power management and control module is used to control the power supply and is electrically connected to the power bus; The oil fume hood control module is used to control the operation of the oil fume hood (2), and to control the air collection rate and the volatile organic matter extraction rate; The first fan control module is used to control the operating speed and operating time of the first circulation fan (3); The second fan control module is used to control the operating speed and operating time of the second circulation fan (6); The VOC control module includes an activated carbon adsorption column control unit and a heater control unit, wherein: The activated carbon adsorption column control unit is used to control the switching, transmission and introduction rate of the activated carbon adsorption column; The heater control unit is used to control the efficiency of heat flow introduction into the activated carbon adsorption column with desorption function, thereby controlling the desorption efficiency; The CPU processor is also electrically connected to the flow control valve to control the rate at which the oil smoke is introduced into the VOC purifier (4); The oil fume collecting hood (2), the first circulating fan (3), the VOC purifier (4) and the second circulating fan (6) are electrically connected to a power bus, wherein: The oil fume collecting hood (2) is equipped with a first motor (M1), the first circulating fan (3) is equipped with a second motor (M2), the second circulating fan (6) is equipped with a third motor (M3), and the heater (5) is equipped with a heating element (A), wherein: The first motor (M1) is directly connected to a power source, wherein a first fuse (FU1) is provided at a connection between the first motor (M1) and the live wire; The second motor (M2), the third motor (M3) and the heating element (A) are connected in parallel to a power supply, wherein: A second fuse (FU2) is provided at the connection point between the second motor (M2), the third motor (M3) and the heating element (A) and the live wire; A time relay (KM1) is connected between the third motor (M3) and the second fuse (FU2); A first control switch (K1) and a third fuse (FU3) are provided between the input end of the heating element (A) and the output end of the second fuse (FU2); the output end of the heating element (A) is connected to a digital rheostat (RS); the output end of the digital rheostat (RS) is connected to a control relay (KM2); and the output end of the control relay (KM2) is connected to a second control switch (K2).

2. A restaurant fume volatile organic matter purification system as claimed in claim 1, characterized in that: The oil fume separator comprises: a separation filter (21) and an oil fume filter assembly (22), wherein: The separation filter (21) is used to filter particulate matter in the oil smoke; The filter assembly (22) is used for purifying oil smoke and removing volatile organic matter from the oil smoke.

3. A restaurant fume volatile organic matter purification system as claimed in claim 1, characterized in that: The number of the activated carbon adsorption columns is at least three, including: a first activated carbon adsorption column (41), a second activated carbon adsorption column (42) and a third activated carbon adsorption column (43). In the same cycle, the initial functions of the first activated carbon adsorption column (41), the second activated carbon adsorption column (42) and the third activated carbon adsorption column (43) are different, wherein: The initial functions include: adsorption function, desorption function and cooling function; In the same cycle: The first activated carbon adsorption column (41) starts to adsorb oil smoke, and when the adsorption is saturated, the first activated carbon adsorption column (41) performs thermal desorption on the oil smoke; when the desorption is completed, the first activated carbon adsorption column (41) starts to cool; when the cooling is completed, the first activated carbon adsorption column (41) starts to adsorb oil smoke again; The second activated carbon adsorption column (42) performs thermal desorption on the oil smoke; when desorption is completed, the second activated carbon adsorption column (42) starts to cool; when cooling is completed, the second activated carbon adsorption column (42) starts to adsorb the oil smoke; when adsorption is saturated, the second activated carbon adsorption column (42) starts to thermally desorb the oil smoke again; The third activated carbon adsorption column (43) starts to cool down. After the cooling is completed, the third activated carbon adsorption column (43) starts to adsorb the oil smoke. When the adsorption is saturated, the third activated carbon adsorption column (43) performs thermal desorption on the oil smoke. After the thermal desorption is completed, the third activated carbon adsorption column (43) starts to cool down again.

4. A restaurant fume volatile organic matter purification system as claimed in claim 3, characterized in that: The activated carbon adsorption column switching performs the following steps: The surface area of ​​the activated carbon adsorption column is divided into sub-regions, and obtaining relevant data on the oil smoke input rate in the sub-regions to determine the saturation conversion coefficient of the activated carbon adsorption column; in, is the activated carbon adsorption column saturation conversion coefficient, is the sum of the sub-regions, For the The oil smoke input rate of each sub-area, For the The oil smoke volume of the sub-area, ; The activated carbon adsorption column saturation conversion coefficient is used to obtain the input rate of the activated carbon adsorption column input port in real time, thereby obtaining the real-time oil fume adsorption saturation; in, For the The saturation of oil smoke adsorption on the activated carbon adsorption column at the moment, sf is the available area of ​​the activated carbon adsorption column, For the The oil fume input rate of the activated carbon adsorption column at each moment; Get Real-time data, when When it is 1, the saturation of the activated carbon adsorption column reaches 100%, and the switching step is performed.

5. A restaurant fume volatile organic matter purification system as claimed in claim 1, characterized in that: The heater (5) is used to perform a thermal desorption function, wherein: The air inlet of the heater (5) is connected to an activated carbon adsorption column having a cooling function, and the air outlet is connected to an activated carbon adsorption column having a desorption function, so as to realize a thermal desorption function.

6. A restaurant fume volatile organic matter purification system as claimed in claim 1, characterized in that: The first motor (M1), the second motor (M2) and the third motor (M3) are respectively equipped with a first switch group (KS1), a second switch group (KS2) and a third switch group (KS3); The air collecting hood control module is electrically connected to the first switch group (KS1); The first fan control module is electrically connected to the second switch group (KS2), and the second fan control module is electrically connected to the third switch group (KS3) and the time relay (KM1); The heater control unit is electrically connected to the first control switch (K1), the digital rheostat (RS), the control relay (KM2) and the second control switch (K2).

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