Hazardous waste storage room air purification system and control method thereof

Abstract

The invention discloses a hazardous waste storage room air purification system and a control method thereof, and belongs to the technical field of hazardous waste treatment. According to the invention, the problems of safety and explosion prevention of the hazardous waste storage chamber, good air purification effect and low cost are solved. The system comprises a harmful component detection system which comprises a plurality of detection probes used for detecting various harmful components respectively; the air purification system comprises a suction mechanism and a gas purification mechanism, whether the suction mechanism is started or not and the starting power are jointly determined according to the detection result of the harmful component detection system, the maximum power of the suction mechanism and the purification effect of the gas purification mechanism, and the control system is used for achieving man-machine interaction and controlling cooperative operation of all the systems. The threshold values for starting and closing the air purification system are set for various harmful components in the hazardous waste storage chamber respectively, the air purification system is started when the content of a certain harmful component exceeds the threshold value, and compared with the prior art that the air purification system is kept to be started all the time, the cost is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of hazardous waste treatment, and in particular relates to an air purification system for a hazardous waste storage room and a control method thereof. Background Art

[0002] Hazardous wastes generated by Chinese herbal medicine companies mainly include waste activated carbon, waste reagent packaging bottles, experimental waste, etc. Specifically, waste activated carbon is used to adsorb organic waste gas, etc., and is generated in the waste gas treatment process; waste reagent packaging bottles are packaging bottles contaminated with reagents during the experimental inspection process; experimental waste is organic waste liquid generated during the experimental inspection process and items contaminated with organic waste liquid.

[0003] In the prior art, a storage room is set up specifically for stacking hazardous waste. A fan is installed in the storage room. The harmful gas volatilized from the storage room is pumped into the purification system for purification through the fan. However, in this process, the amount of hazardous waste stored in the storage room is different at different times. If the fan is turned on all the time, although a good purification effect can be achieved, it also causes a waste of resources, resulting in higher production costs for the enterprise. Summary of the invention

[0004] In view of the problem in the prior art of how to balance the safety and explosion-proof of a hazardous waste storage room, good air purification effect and low cost, the present invention provides an air purification system for a hazardous waste storage room and a control method thereof.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An air purification system for a hazardous waste storage room, comprising:

[0007] The harmful component detection system includes a plurality of detection probes respectively used to detect various harmful components, and the installation position of each detection probe is set according to the distribution of various harmful components in the hazardous waste storage room, the placement of the hazardous waste and the layout of the hazardous waste storage room;

[0008] The air purification system includes a suction mechanism and a gas purification mechanism connected to each other, and determines whether the suction mechanism is started and the starting power according to the detection result of the harmful component detection system, the maximum power of the suction mechanism and the purification effect of the gas purification mechanism;

[0009] Temperature detection system, used to detect the indoor temperature of the hazardous waste storage room;

[0010] The data storage and processing system is used to record the hazardous waste storage data, and to obtain the estimated content of harmful substances in the air in real time according to the type of hazardous waste, the amount of hazardous waste stored, the indoor temperature, and the size of the indoor space, and to compare the estimated content of various harmful substances in the air obtained by analysis with the actual content of various harmful components actually detected by the harmful component detection system;

[0011] An alarm system is used to generate an alarm when the difference between the estimated content and the actual content of the harmful component in the data storage and processing system exceeds a threshold;

[0012] Control system, used to realize human-computer interaction and control the coordinated operation of various systems.

[0013] After adopting this technical solution, the present invention sets the detection probes for detecting various harmful gases at different heights in the hazardous waste storage room according to the different distributions caused by the different densities of various hazardous wastes in the hazardous waste storage room, so as to achieve accurate detection of different harmful gases and effectively improve the accuracy of harmful gas detection. In addition, the present invention also obtains the estimated content of harmful substances in the air in real time according to the type of hazardous waste, the amount of hazardous waste stored, the indoor temperature, and the size of the indoor space, and compares the estimated content of various harmful substances in the air obtained by analysis with the actual content of various harmful components actually detected by the harmful component detection system. When the difference exceeds the threshold, it indicates that a leak may have occurred, and the staff is provided with timely processing to avoid the leakage of harmful components into the environment, thereby ensuring the effect of energy saving and emission reduction, and effectively avoiding environmental pollution.

[0014] Preferably, at least one air outlet is provided in the hazardous waste storage room near each detection probe, and each air outlet is provided with an electric valve, and the opening of the electric valve at each air outlet is determined according to the detection results of each detection probe.

[0015] After adopting this technical solution, when one of the detection probes detects that the content of harmful components exceeds the threshold, the air purification system is started. Since the power of the air purification system is constant, in order to achieve rapid discharge and purification of harmful components, the present invention determines the opening of each air outlet according to the detection results. For example, the opening of the air outlet near the detection probe that detects that the content exceeds the threshold can be maximum, while the opening of other air outlets is determined according to the gap with the threshold. For example, if the gap from the threshold exceeds 50%, it can be opened by only 10%-20% or even not opened. In this way, the suction force is mainly concentrated in the area where the harmful components exceed the standard, so as to achieve rapid discharge and purification of harmful components and reduce the purification cost.

[0016] Preferably, the gas purification mechanism comprises a first purifier and a second purifier connected in series.

[0017] Preferably, the detection probe comprises a methanol detection probe and an acetonitrile detection probe, the methanol detection probe is arranged at the upper part of the hazardous waste storage chamber, and the acetonitrile detection probe is arranged at the lower part of the hazardous waste storage chamber.

[0018] Preferably, the acetonitrile detection probe is arranged at a distance of 30-50 cm from the floor of the hazardous waste storage room, and the methanol detection probe is arranged at a distance of 50-200 cm from the hazardous waste storage room above the hazardous waste stacking location.

[0019] A control method for an air purification system in a hazardous waste storage room, comprising:

[0020] The start threshold and the shut-down threshold of the air purification system are determined according to the type of hazardous waste, the size of the hazardous waste storage room, the purification efficiency of the gas purification mechanism, and the suction power of the suction mechanism. When the content of harmful components detected by one of the detection probes exceeds the start threshold, the air purification system is started, and the air purification system is shut down after the content of harmful components is lower than the shut-down threshold.

[0021] The estimated content of harmful substances in the air in real time obtained from the hazardous waste storage volume, indoor temperature, and indoor space size is compared with the detection results of the harmful component detection system. When the difference exceeds the set value, a leakage alarm is issued.

[0022] Preferably, the method also includes deriving an estimated start time of the air purification system based on the type of hazardous waste, indoor temperature, hazardous waste storage volume and indoor space size, and determining whether the start time of the air purification system is during the night time period when electricity rates are lower; if it is during the night time period when electricity rates are lower, the air purification system is started according to the start threshold; if it is not during the night time period when electricity rates are lower, the air purification system is started the night before the estimated start time.

[0023] After adopting this technical solution, since the electricity charges at night in most areas are generally slightly lower than those during the day, in order to reduce the purification cost, the present invention derives the estimated start-up time of the air purification system according to the type of hazardous waste, organic waste gas concentration, indoor temperature, hazardous waste storage volume and indoor space size, and determines whether the start-up time is in the period when the night electricity charges are disclosed. If so, no adjustment is made; if not, the system can be started in advance, thereby minimizing the required electricity charges while ensuring the purification effect, thereby further reducing costs.

[0024] Preferably, when the harmful component content detected by one of the detection probes exceeds the starting threshold, the air purification system is started, and the electric valve opening at the air outlet near the detection probe is opened to the maximum, and the opening of the electric valves at the air outlets near the remaining detection probes is determined according to the difference between the harmful component content and the starting threshold at this time.

[0025] Preferably, the method further includes detecting the content of harmful components in the hazardous waste storage room through a harmful component detection system when the system is initially started or any parameter such as the type of hazardous waste, indoor temperature, or the amount of hazardous waste stored changes, and deriving an estimated start-up time of the air purification system based on the type of hazardous waste, indoor temperature, amount of hazardous waste stored, and the size of the indoor space, and then shutting down the harmful component detection system and starting the harmful component detection system again 10-30 minutes before the estimated time to detect the content of harmful components in the hazardous waste storage room, and starting the air purification system based on the test results.

[0026] After adopting this technical solution, the present invention intermittently starts the air purification system according to the expected start-up time of the air purification system. Therefore, not only does it not need to keep the air purification system turned on all the time, but it also does not need to keep the harmful component detection system turned on all the time. This not only ensures the purification effect, but also reduces the energy consumption required by the harmful component detection system, further reducing costs.

[0027] Preferably, when the harmful component detection system is intermittently turned on and off, the harmful components in the hazardous waste storage room are started every 30-60 minutes during the time period when the harmful component detection system should be turned off, and the expected content is compared with the actual content of various harmful components actually detected by the harmful component detection system. When the difference exceeds the threshold, the alarm system is activated.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. According to the characteristic that different hazardous wastes with different densities will be deposited at different positions in the hazardous waste storage room, the present invention sets corresponding detection probes at various positions in the hazardous waste storage room to achieve accurate detection of different hazardous wastes and ensure the purification effect.

[0030] 2. The present invention obtains the estimated content of harmful substances in the air in real time according to the storage capacity of hazardous waste, indoor temperature, and indoor space size, and compares the estimated content with the actual detection result in real time. If the difference exceeds the set value, it indicates that the harmful components may be leaked, thereby issuing an alarm to remind the operator to deal with it in time, which can effectively avoid environmental pollution caused by the leakage of harmful components.

[0031] 3. The present invention sets thresholds for starting and shutting down the air purification system for various harmful components in the hazardous waste storage room. The air purification system is started only when the content of a certain harmful component exceeds the threshold. Compared with keeping the air purification system turned on all the time, the cost is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Among them, 1-first purifier, 2-second purifier, 3-suction mechanism, 4-electric valve, 5-air outlet, 6-hazardous waste storage room. DETAILED DESCRIPTION

[0034] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0035] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] like Figure 1 As shown, an air purification system for a hazardous waste storage room comprises:

[0037] The harmful component detection system includes several detection probes for detecting various harmful components, and the installation position of each detection probe is set according to the distribution of various harmful components in the hazardous waste storage room 6, the placement of hazardous wastes, and the layout of the hazardous waste storage room 6; since the hazardous wastes generated in the production process of Chinese herbal medicine slices mainly come from hazardous wastes such as organic solvents used in quality inspection, and the types are relatively single, the detection probes in this embodiment only include methanol detection probes and acetonitrile detection probes. In other embodiments, the corresponding number and type of detection probes can be set according to the different harmful gases generated by different hazardous wastes. The methanol detection probe is set at the upper part of the hazardous waste storage room 6, 1m away from the highest point of the hazardous waste stacking, and the acetonitrile detection probe is set at the lower part of the hazardous waste storage room 6, 40cm away from the ground. It should be noted that the methanol detection probe and the acetonitrile detection probe should be kept at least 0.5m away from the placement position of the hazardous waste, so as to avoid misjudgment caused by the detection probe being too close to the hazardous waste.

[0038] The air purification system includes a suction mechanism 3 and a gas purification mechanism connected to each other, and determines whether the suction mechanism 3 is started and the starting power according to the detection results of the harmful component detection system, the maximum power of the suction mechanism 3 and the purification effect of the gas purification mechanism; in this embodiment, the gas purification mechanism includes a first purifier 1 and a second purifier 2 connected in series, the first purifier 1 and the second purifier 2 are both activated carbon purifiers, the first purifier 1 is connected to the air outlet 5 on the hazardous waste storage chamber 6, and the second purifier 2 is connected to the suction mechanism 3. In this embodiment, the suction mechanism 3 is an air pump, and the gas outlet of the suction mechanism 3 is connected to the emptying pipe. When receiving the start signal, the suction mechanism starts to generate suction, thereby sucking the air containing harmful components in the hazardous waste storage chamber 6 into the gas purification mechanism, and then passing through the first purifier 1 and the second purifier 2 in sequence and discharged into the emptying pipe for emptying, thereby achieving the purification of harmful gases. It should be noted that the purification performance of the first purifier 1 and the second purifier 2 is set according to the type of hazardous waste, the storage volume of hazardous waste, and the size of the indoor space. Therefore, the gas can meet the emission standards after being purified by the first purifier 1 and the second purifier 2.

[0039] The temperature detection system is used to detect the indoor temperature of the hazardous waste storage room; in this embodiment, the temperature detection system is a temperature sensor installed in the hazardous waste storage room 6. It should be noted that the number of temperature sensors is set according to the size of the hazardous waste storage room 6. If the hazardous waste storage room 6 is large, multiple temperature sensors can be installed, and multiple temperature sensors are installed in various parts of the hazardous waste storage room 6, and the average value detected by each temperature sensor is used as the detected temperature data; when the room is small, one temperature sensor can be installed. In this embodiment, the room size is about 160 square meters, so there are two temperature sensors installed in total, and the average value of the temperature detected by the two temperature sensors is used as the detected temperature data.

[0040] The data storage and processing system is used to store the hazardous waste inlet and outlet data. The data storage and processing system obtains the storage volume of various hazardous wastes in the hazardous waste storage chamber 6 based on the stored hazardous waste inlet and outlet data, and obtains the estimated content of various harmful substances in the air in real time based on the storage volume of hazardous waste, the temperature in the hazardous waste storage chamber 6, and the size of the indoor space; when the estimated content differs greatly from the actual content detected by the harmful component detection system, the alarm system is activated. In this embodiment, the alarm system is activated when the difference between the estimated content and the actual content detected by the harmful component detection system is greater than or equal to 10%.

[0041] The alarm system is used to sound an alarm. In this embodiment, the alarm system is an audible and visual alarm system, which can sound an alarm and flash a light to alert the operator. In other embodiments, the alarm system can also establish a connection with the enterprise's management system, so that when a leak is detected, the operator can be notified in time to prevent harmful gases from leaking into the surrounding environment.

[0042] The control system is used to realize human-computer interaction and control the coordinated operation of various systems. The control system includes an operation panel arranged on the outer wall of the hazardous waste storage chamber 6. Through the operation panel, each system can be regulated, the parameters of each system can be set, and the entire system can be closed or opened. At the same time, the entry of hazardous waste inlet and outlet data (including the type and quantity of hazardous waste) can also be completed.

[0043] In one embodiment, an air vent 5 is provided in the hazardous waste storage chamber 6 near each detection probe, that is, an air vent 5 is provided near the methanol detection probe and the acetonitrile detection probe. In other embodiments, a filter may also be provided at the air vent 5 to intercept solid impurities and prevent solid impurities in the room from entering the air purification system and affecting the purification effect. In this embodiment, the size of the air vent is about 15 cm, and an electric valve 4 is provided at each air vent 5. The opening of the electric valve 4 at each air vent 5 is determined according to the detection results of each detection probe. When one of the detection probes detects that the content of harmful components exceeds the threshold, the air purification system is started. Since the power of the air purification system is constant, in order to achieve rapid discharge and purification of harmful components, the present invention determines the opening of each air outlet 5 according to the detection results. In this embodiment, the air outlet 5 near the detection probe that detects that the content exceeds the threshold is opened to the maximum (if multiple detection probes detect that the threshold is exceeded, the air outlet 5 around each detection probe is opened to the maximum). For other detection probes that have not yet detected that the threshold is exceeded, their opening is determined according to the gap with the threshold. Specifically: if the gap from the threshold is more than 50%, it can be opened by 20%; if the gap from the threshold is 20-50%, it can be opened by 50%; if the gap from the threshold is 0-20%, it can be opened by 80%. In this way, the suction force is mainly concentrated in the area where the harmful components exceed the standard, and the harmful components can be quickly discharged and purified, which can also reduce the purification cost.

[0044] A control method for a hazardous waste storage room air purification system is implemented using the hazardous waste storage room air purification system, comprising:

[0045] The start threshold and the shut-down threshold of the air purification system are determined according to the type of hazardous waste, the size of the hazardous waste storage chamber 6, the purification efficiency of the gas purification mechanism, and the suction power of the suction mechanism 3. In this embodiment, the start threshold of methanol is 6ppm, and the shut-down threshold is 3ppm. The start threshold of acetonitrile is 9ppm, and the shut-down threshold is 4.5ppm. When the content of harmful components detected by one of the detection probes exceeds the start threshold, a signal is transmitted to the air purification system. When the air purification system receives the start signal, the first purifier 1, the second purifier 2, and the suction mechanism are started to generate suction, so that the air containing harmful components in the hazardous waste storage chamber 6 is sucked into the gas purification mechanism, and is discharged into the exhaust pipe after passing through the first purifier 1 and the second purifier 2 in sequence for emptying, thereby achieving purification of harmful gases until the content of harmful components is lower than the shut-down threshold and the air purification system is shut down;

[0046] At the same time, the data storage and processing system compares the estimated content of harmful substances in the air in real time based on the amount of hazardous waste stored, the indoor temperature, and the size of the indoor space with the test results of the harmful component detection system, and issues a leakage alarm when the difference exceeds 10%. The estimated content of harmful substances in the air in real time is obtained based on the amount of hazardous waste stored, the indoor temperature, and the size of the indoor space, and the estimated content is compared with the actual test results in real time. If the difference exceeds the set value, it means that the harmful components may be leaking, and an alarm is issued to remind the operator to deal with it in time, which can effectively avoid the pollution of the environment caused by the leakage of harmful components.

[0047] In one embodiment, for the situation where the air purification system is started only once every ten or twenty hours due to a large space and less hazardous waste, the data storage and processing system also includes deriving an estimated start-up time of the air purification system based on the type of hazardous waste, indoor temperature, hazardous waste storage volume, and indoor space size, and judging whether the start-up time of the air purification system is in the night time period with lower electricity costs (such as 10 pm to 8 am the next day). If it is in the night time period with lower electricity costs, the air purification system is started according to the start-up threshold. If it is not in the night time period with lower electricity costs, the air purification system is started the night before the expected start-up time. Starting the air purification system during the night time period with lower costs can effectively reduce the effective cost of the air purification system. Of course, it should be noted that if the hazardous waste storage room 6 has a small space and more hazardous waste, it is impossible to move the suction time to the night when it is necessary to suction once every few hours, then the air purification system can be started according to the start-up threshold.

[0048] In one of the embodiments, it also includes detecting the harmful component content in the hazardous waste storage room through the harmful component detection system when the system is initially started or any parameter of the hazardous waste type, indoor temperature, and hazardous waste storage capacity changes, and obtaining the estimated air purification system startup time according to the hazardous waste type, indoor temperature, hazardous waste storage capacity, and indoor space size through the data storage and processing system, and then shutting down the harmful component detection system, and continuously starting the harmful component detection system 30 minutes before the estimated time to perform real-time continuous detection of the harmful component content in the hazardous waste storage room, and starting the air purification system according to the detection results. The present invention starts the air purification system intermittently according to the estimated air purification system startup time, so not only does it not need to keep the air purification system turned on all the time, but it also does not need to keep the harmful component detection system turned on all the time, which not only ensures the purification effect, but also reduces the energy consumption required by the harmful component detection system, further reducing the cost. At the same time, in order to take into account the detection of whether there is any harmful gas leakage in the hazardous waste storage room 6, during the time period when the harmful component detection system should be closed, the harmful component detection system is started every 30-60 minutes to detect the harmful components in the environment, and it is determined whether the detected results are consistent with the expected results. If the deviation exceeds the threshold, the alarm system is activated. After this setting, leakage detection is taken into account and power consumption is reduced.

[0049] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. An air purification system for a hazardous waste storage room, characterized in that: include: A harmful component detection system comprises a plurality of detection probes respectively used to detect various harmful components, wherein the installation position of each detection probe is set according to the distribution of various harmful components in the hazardous waste storage room (6), the placement position of the hazardous waste and the layout of the hazardous waste storage room (6); The air purification system comprises a suction mechanism (3) and a gas purification mechanism connected to each other, and determines whether the suction mechanism (3) is started and the starting power according to the detection result of the harmful component detection system, the maximum power of the suction mechanism (3) and the purification effect of the gas purification mechanism; A temperature detection system, used to detect the indoor temperature of the hazardous waste storage room (6); The data storage and processing system is used to record the hazardous waste storage data, and to obtain the estimated content of harmful substances in the air in real time according to the type of hazardous waste, the amount of hazardous waste stored, the indoor temperature, and the size of the indoor space, and to compare the estimated content of various harmful substances in the air obtained by analysis with the actual content of various harmful components actually detected by the harmful component detection system; An alarm system is used to generate an alarm when the difference between the estimated content and the actual content of the harmful component in the data storage and processing system exceeds a threshold; Control system, used to realize human-computer interaction and control the coordinated operation of various systems.

2. The hazardous waste storage room air purification system according to claim 1, characterized in that: At least one air outlet (5) is arranged in the hazardous waste storage chamber (6) near each detection probe, and each air outlet (5) is provided with an electric valve (4). The opening of the electric valve (4) at each air outlet (5) is determined according to the detection results of each detection probe.

3. The hazardous waste storage room air purification system according to claim 1, characterized in that: The gas purification mechanism comprises a first purifier (1) and a second purifier (2) connected in series.

4. The hazardous waste storage room air purification system according to claim 1, characterized in that: The detection probe comprises a methanol detection probe and an acetonitrile detection probe, the methanol detection probe is arranged at the upper part of the hazardous waste storage chamber (6), and the acetonitrile detection probe is arranged at the lower part of the hazardous waste storage chamber (6).

5. The hazardous waste storage room air purification system according to claim 4, characterized in that: The acetonitrile detection probe is arranged at a distance of 30-50 cm from the ground of the hazardous waste storage room (6), and the methanol detection probe is arranged at a distance of 50-200 cm from the hazardous waste storage room (6) above the hazardous waste stacking location.

6. A control method for an air purification system for a hazardous waste storage room according to any one of claims 1 to 5, characterized in that: include: Determine a start threshold and a shut-down threshold of the air purification system according to the type of hazardous waste, the size of the hazardous waste storage room (6), the purification efficiency of the gas purification mechanism, and the suction power of the suction mechanism (3); when the content of harmful components detected by one of the detection probes exceeds the start threshold, the air purification system is started, and the air purification system is shut down until the content of harmful components falls below the shut-down threshold; The estimated content of harmful substances in the air in real time obtained from the hazardous waste storage volume, indoor temperature, and indoor space size is compared with the detection results of the harmful component detection system. When the difference exceeds the set value, a leakage alarm is issued.

7. The control method of the hazardous waste storage room air purification system according to claim 6, characterized in that: It also includes deriving an estimated start-up time for the air purification system based on the type of hazardous waste, indoor temperature, hazardous waste storage volume, and indoor space size, and determining whether the start-up time of the air purification system is during the night time period when electricity rates are lower. If it is during the night time period when electricity rates are lower, the air purification system is started according to the start-up threshold; if it is not during the night time period when electricity rates are lower, the air purification system is started the night before the estimated start-up time.

8. The control method of the hazardous waste storage room air purification system according to claim 6, characterized in that: When the harmful component content detected by one of the detection probes exceeds the start-up threshold, the air purification system is started, and the electric valve (4) at the air outlet (5) near the detection probe is opened to the maximum opening, and the opening of the electric valve (4) at the air outlet (5) near the other detection probes is determined according to the difference between the harmful component content at this time and the start-up threshold.

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