CN103836774A - Plasma purifier optimization control method - Google Patents

Abstract

The invention discloses a plasma purifier optimization control method. Various gas and particle sensors, a controller and external execution units form a closed-loop control circuit. A current air sampled value is compared with the national standard to judge air pollution index, and a corresponding air purification method is optionally selected; output power of a digital direct-current power source is changed according to measured ozone concentration, and the ozone concentration is dynamically controlled to maintain in the optimal range of the national standard.

Description

A control method for an optimal plasma purification device

technical field

The invention relates to the field of gas purification, in particular to a control method for a preferred plasma purification device.

Background technique

With the development of society and the enhancement of environmental awareness, people have higher and higher requirements for the air quality of their living environment. However, with the development of urban industrialization, the acceleration of urbanization and the construction of infrastructure, air pollution has become more and more serious. Volatile organic substances (VOC, such as formaldehyde, toluene, xylene, etc.), inhalable particulate matter (PM2.5, PM10), ozone content, and the total number of air bacterial colonies have become important indicators for evaluating indoor air quality.

In such an environment, even if the windows are closed to reduce ventilation, the gaseous substances such as bacteria, viruses, odor molecules, VOCs, and inhalable particles such as dust accumulated in the air not only produce unpleasant odors, but also make the air dirty, which is easy to cause respiratory problems. Diseases, infections and other ailments can have a serious impact on people's health.

The central air-conditioning system belongs to internal circulation. Although it is equipped with a filter, it can only filter dust with a large particle size, and does not have the function of air purification. The indoor ventilation system takes ventilation when the air pollution is serious, which will reduce the indoor air quality and increase energy consumption.

At present, there are many types of gas purifiers on the market. In terms of its basic working principle, it mainly includes conventional filter adsorption type, electrostatic precipitator type, negative ion and plasma purification, ultraviolet light and nano photocatalyst combination type, etc. In today's diverse and complex pollution sources, a single technology is often difficult to meet the requirements of air purification. Usually electrostatic dust removal, negative ion (plasma), ultraviolet and photocatalyst technologies are combined to enhance the effect of synergistic governance. The various components of the air purifier are usually in a continuous working state, and some components such as negative ion (plasma) generators, ultraviolet and photocatalyst components have a certain service life, and continuous operation will increase the cost of operation and maintenance. Although the air quality is also monitored through sensors, it is only through monitoring that the various components of the air purifier are simply controlled to work or stop at the same time. In practical applications, the air quality changes dynamically. For example, the purifier can be turned off when the air quality is good; and when a certain index of the air quality exceeds the standard, some targeted components can be dynamically selected to obtain the best purification effect. . In addition, when the plasma (negative ions) and photocatalyst components are working, ozone will be generated, and the ozone concentration is also a parameter strictly controlled by the national standard. Therefore, it is necessary to dynamically control the ozone concentration according to the selected components to make the air quality meet the national standard.

Therefore, there is a need for a control method for optimizing the plasma purification device, which can dynamically monitor the various indicators of air quality, and according to the real-time air quality situation, optimize the corresponding air purification components for processing, and control the ozone concentration at the same time, so as to meet people's need for air quality. Purify the needs of green environmental protection, energy saving, high efficiency and convenience.

Contents of the invention

The object of the present invention is to provide a control method of a preferred plasma purification device to achieve the purpose of air purification.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A control method for a preferred plasma purification device, characterized in that: a controller is used to control multiple gases and particle sensors to collect various gas content data in the air, and send them to the controller, and the controller converts the various gas content data Compare with the national standard to judge the air pollution index; then the controller corresponds to different gas and particle pollution, and controls the digital DC controllable power supply and high-voltage power supply to drive one or more of the air disinfection module and the plasma generator. Purification treatment, and air purification treatment by directly controlling one or more of the nano-light hydrogen ion air purifiers.

The control method of a preferred plasma purification device is characterized in that: the controller controls the digital DC controllable power supply to supply power to the high-voltage power supply, and the high-voltage power supply supplies power to the air disinfection module and the plasma generator respectively, and the high-voltage power supply uses different The high-voltage signal excites the air disinfection module and the plasma generator, and the nano-photonic hydrogen ion air purifier is connected to the controller and controlled by the controller.

The control method of a preferred plasma purification device is characterized in that: the air disinfection module is composed of a wire mesh with a structure similar to a sponge, the surface of the mesh has small pointed protrusions, and the interior of the mesh has micropores , the micropore itself can filter particles with large particle size, and the DC high voltage output by the high-voltage power supply is connected to the wire mesh. Under the action of the electrostatic field, it can absorb solid particles with smaller particles, and kill germs in the air and remove odors. .

The control method of a preferred plasma purification device is characterized in that: the electrodes of the plasma generator are connected to the output of a high-voltage power supply, and the digital DC power supply can control the output voltage of the high-voltage power supply. Under the excitation of high-voltage electric field, high-energy particles and various active ingredients can be produced, and the purification effect can be enhanced when the air pollution is heavy.

The control method of a preferred plasma purification device is characterized in that: the nano photohydrogen ion air purifier uses ultraviolet light to irradiate on the nano photocatalyst material to generate free radicals and active particles, which are ionized by advanced oxide particles, Decompose chemical harmful gases and odors, remove particulate matter, kill bacterial and microbial pollutants, so as to achieve the effect of air purification.

The control method of a preferred plasma purification device is characterized in that: the digital DC controllable power supply is connected to the high-voltage power supply through a thyristor, and the thyristor is connected to the controller, and the working state of the thyristor is determined by The controller performs control; the nano-photonic hydrogen ion air purifier is connected to the controller through a thyristor, and the working state of the thyristor is also controlled by the controller.

The present invention adopts various gas and particle sensors, controllers and external execution components to form a closed-loop control circuit. According to the comparison between the current air sampling value and the national standard, the air pollution index is judged, and the corresponding air purification method is selected. Then according to the measured ozone concentration, change the output power of the digital DC power supply to dynamically control the ozone concentration to maintain it within the best range of the national standard. In this way, the effect of air purification can be achieved without secondary pollution. the

Description of drawings

Fig. 1 is a structural principle block diagram of the present invention.

Fig. 2 is a structural layout diagram of the present invention.

Detailed ways

As shown in Figure 1. A control method for a preferred plasma purification device, characterized in that: a controller is used to control multiple gases and particle sensors to collect various gas content data in the air, and send them to the controller, and the controller converts the various gas content data Compare with the national standard to judge the air pollution index; then the controller corresponds to different gas and particle pollution, and controls the digital DC controllable power supply and high-voltage power supply to drive one or more of the air disinfection module and the plasma generator. Purification treatment, and air purification treatment by directly controlling one or more of the nano-light hydrogen ion air purifiers.

The controller controls the digital DC controllable power supply to the high-voltage power supply, and the high-voltage power supply supplies power to the air disinfection module and the plasma generator respectively, and the air disinfection module and the plasma generator are excited by different high-voltage signals through the high-voltage power supply, and nano-photonic hydrogen ion air purification The device access controller is controlled by the controller.

Gas and particle sensors include _O3 sensors, respirable particle sensors, VOC and _NH3 sensors, _SO2 and _NO2 sensors.

The air disinfection module is composed of a sponge-like wire mesh, with small pointed protrusions on the surface of the mesh, and micropores inside the mesh, which can filter large particles. Under the action of an electrostatic field, the wire mesh can absorb smaller solid particles, kill germs in the air and remove odors.

The electrodes of the plasma generator are connected to the output of the high-voltage power supply. Under the excitation of the high-voltage electric field, high-energy particles and various active components can be generated, and the purification effect can be enhanced when the air pollution is heavy.

The nano-photonic hydrogen ion air purifier uses ultraviolet rays to irradiate nano-photocatalyst materials to generate free radicals and active particles, ionize through advanced oxidized particles, decompose chemical harmful gases and odors, remove particulate matter, kill bacterial and microbial pollutants, and reach the air Purifying effect.

The digital DC controllable power supply is connected to the high-voltage power supply through the thyristor, and the thyristor is connected to the controller, and the working state of the thyristor is controlled by the controller; the nano-photonic hydrogen ion air purifier is connected through the thyristor The controller, the working state of the thyristor is also controlled by the controller.

The invention is composed of an air disinfection module, a plasma generator and a nano-photonic hydrogen ion air purifier, and each module can work independently or in parallel under the control of a controller. According to the comparison between the current air sampling value and the national standard, the air pollution index is judged, and the corresponding air purification module is selected for processing. Since each module can generate ozone when it is working, according to the measured ozone concentration, the output voltage of the digital DC power supply is changed, and the ozone concentration is dynamically controlled to maintain it within the best range of the national standard.

Its mode of work of the present invention comprises the following steps:

1. Turn on the computer and the system will run in the default mode.

2. According to the comparison between the measured value of the sensor and the national standard, determine the degree of air pollution, and optimize the corresponding plasma purification method.

2.1 The air quality is excellent, only the air disinfection module is turned on

2.2 If sulfur dioxide or nitrogen dioxide exceeds the standard, activate the warning (sound alarm or flashing warning light) or open the fresh air system.

2.3 PM10, PM2.5 exceed the standard: start air disinfection and plasma generator

2.4 Exceeding the VOC standard: start the plasma generator and nano-photonic hydrogen ion air purifier

2.5 A number of indicators exceeded the standard, and the air disinfection module, plasma generator, and nano-photonic hydrogen ion air purifier were activated

3. After optimizing different plasma purification methods, according to the measured ozone concentration value, the controller makes a judgment and adjusts the output of the digital DC power supply, thereby changing the output of the high-voltage power supply, so that the ozone concentration is in the optimal range.

3.1 N ₁ <Ns and N ₁ >= Ns-ΔN, maintain the current working state (ozone concentration is the best)

3.2 N ₁ <Ns and N ₁ <Ns-ΔN (low ozone concentration), increase the working voltage of the digital DC controllable power supply to increase the power,

3.3 N1>Ns (high ozone concentration), then reduce the working voltage of the digital DC controllable power supply to further reduce the power.

4. The controller executes cyclically from the second step

The air disinfection module is composed of a sponge-like wire mesh, with small pointed protrusions on the surface of the mesh, and micropores inside the mesh, which can filter large particles. Parallel wire mesh. Under the action of the electrostatic field, it can adsorb smaller solid particles, kill germs in the air and remove odors.

The electrodes of the plasma generator are connected with the output of the high-voltage DC power supply, and high-energy particles and various active components can be generated under the excitation of the high-voltage electric field. When the air pollution is heavy, its purification effect can be enhanced.

Nano photohydrogen ion air purifier is a kind of photocatalyst catalytic air purification technology. It uses special band ultraviolet rays to irradiate nano photocatalyst materials to generate free radicals and active particles. These advanced oxidized particles are ionized and decompose chemical harmful gases and odors. Remove particulate matter, kill bacteria and other microbial pollutants, so as to achieve the effect of air purification.

The air disinfection module and the plasma generator are excited by different high-voltage power supplies, and the high-voltage power supply is powered by a digital DC controllable power supply. The controllable power supply is provided with a digital interface connected to the controller, and the output DC voltage can be adjusted through the controller, thereby changing the output power of the high-voltage power supply.

The output of the digital DC controllable power supply and the high voltage power supply are connected by thyristors, and the working state of the thyristors is controlled by the output of the controller. Similarly, the power supply of the nano-photonic hydrogen ion source is also connected by a thyristor, and the working state of the thyristor is controlled by the output of the controller.

As shown in Figure 2, the preferred plasma purification device of the present invention includes an air inlet 7 and an air outlet 8, and an air disinfection module 2, a plasma generator 3, and a nano-light hydrogen ion air cleaner are sequentially arranged between the air inlet and the air outlet 4 and fan 5. The air inlet and the air outlet are provided with interfaces 1 and 6, which can be conveniently connected with the central air-conditioning system and the fresh air system. The device can also be combined with the control system to become an independent air purifier, which is very convenient to use.

Each module of the present invention can work independently or in combination under the control of the controller. By comparing the sampling values of various gas and particle sensors with the national standard, the air pollution index is judged, and different air purification modules are selected for processing. Since each module can generate ozone when it is working, according to the collected ozone concentration, the output voltage of the digital DC power supply is changed, and the ozone concentration is dynamically controlled to maintain it within the best range of the national standard.

For occasions where a central air conditioner has been installed, the device can be installed at the air outlet of the central air conditioner through interfaces 1 and 6. If there is a ventilation system installed indoors, the system can be installed at the outlet of the ventilation system through interfaces 1 and 6, and when the relevant indoor air indicators exceed the standard, the control signal will be output to start the ventilation system to purify the fresh air outside. When entering the room, when the outdoor air passes through the working module of the present invention, the corresponding module can be selected to purify the air under the control of the controller. In addition, the system can be connected to the air outlet of the air conditioner (wall-mounted or cabinet) through interfaces 1 and 6. Each module of the present invention can also be combined with the control system, and the shell can be installed to become an independent stand-alone air cleaner,

Example 1: Treatment of inhalable particulate matter (standard for inhalable particulate matter in indoor air GB/T17095)

In the simulation laboratory, quantitative printer toner is distributed in the test space to simulate the situation of exceeding the standard of inhalable particulate matter, and the initial concentration of the space is obtained by the impact weighing method.

Using the control method of the preferred plasma purification device of the present invention, the sensor detects that the particulate matter exceeds the standard, and it is preferred that the air disinfection module 2 and the plasma generator 3 work in parallel. Use this method to work for 24 hours to re-sample the content of particulate matter in the air. Its content dropped from the initial 1.00 mg/L to 0.04 mg/L, and the decomposition rate reached 96%. During the test, the sensor dynamically monitors the air quality. When the particle content is lower than the national standard of 0.15 mg/L, the controller switches the working module, and only the air disinfection module 2 is selected to work. At the same time, according to the detected ozone concentration, the output power of the high-voltage power supply is dynamically adjusted to control the ozone concentration within the national standard. Therefore, the method can optimize the corresponding processing module according to the dynamic change of the air quality, and at the same time achieve the best processing effect. It has the characteristics of high efficiency, energy saving, environmental protection and easy maintenance.

the

Embodiment 2: Treatment of VOC and odor gas

In the simulated laboratory, formaldehyde solution, benzene, methyl mercaptan solution (the solutions used are all analytically pure solutions), and ammonia solution were placed in a watch glass, and volatilized in the space for 12 hours, and then the initial concentration was sampled. Relevant standards are based on GB/18883-2002, GB/T 18204.25-2000, GB/T 18204. 26 - 2000, GB 11737-89.

Using the control method of the preferred plasma purification device of the present invention, the sensor detects that ammonia and VOC exceed the standard, and the plasma generator 3 and the nano-light hydrogen ion air cleaner 4 are preferably operated in parallel. Use this method to work for 24 hours to sample the corresponding pollutant content in the air again, and obtain its degradation rate. The 24-hour degradation rate reached above 91.5%. During the test, the sensor dynamically monitors the air quality. When the pollutant content is lower than the national standard, the controller switches the working modules, and only the air disinfection module 2 is selected to work. At the same time, according to the detected ozone concentration during the test, the output power of the high-voltage power supply is dynamically adjusted to control the ozone concentration within the national standard.

the

Embodiment three: sterilization test

Firstly, in the simulation laboratory, the device is used to detect the air quality, and all the indicators have reached the national standard. Use the impact method GB/T 18204.1-2000 to obtain the initial number of colonies in the air.

By adopting the control method of the preferred plasma purification device of the present invention, the air quality detected by the sensor all reaches the national standard. Preferably, the air disinfection module 2 works for 24 hours, then measures the total number of bacteria in the air, and obtains the sterilization rate. The 24-hour sterilization rate reaches more than 99%. During the test, the sensors dynamically monitor the air quality, and the corresponding modules are optimized to work in parallel or individually. At the same time, according to the detected ozone concentration during the test, the output power of the high-voltage power supply is dynamically adjusted to control the ozone concentration within the national standard.

The above-mentioned embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (6)

1. A control method for an optimal plasma purification device, characterized in that: a controller is used to control multiple gases and particle sensors to collect various gas content data in the air, and send it to the controller, and the controller controls various gases The content data is compared with the national standard to judge the air pollution index; then the controller corresponds to different gas and particle pollution, and controls one or more of the air disinfection module and the plasma generator by controlling the digital DC controllable power supply and high-voltage power supply Perform air purification treatment, and perform air purification treatment by directly controlling one or more of the nano-photonic hydrogen ion air purifiers. 2. The control method of a preferred plasma purification device according to claim 1, characterized in that: the controller controls the digital DC controllable power supply to supply power to the high-voltage power supply, and the high-voltage power supply supplies power to the air disinfection module and the plasma generator respectively , the air disinfection module and the plasma generator are excited with different high-voltage signals through the high-voltage power supply, and the nano-photonic hydrogen ion air purifier is connected to the controller and controlled by the controller. 3. The control method of a preferred plasma purification device according to claim 1, characterized in that: the air disinfection module is composed of a wire mesh with a structure similar to a sponge, the surface of the wire mesh has small pointed protrusions, and the wire mesh There are micropores inside the net, and the micropores themselves can filter large particles. The DC high voltage output by the high-voltage power supply is connected to the wire mesh. Under the action of the electrostatic field, it can absorb solid particles with smaller particles and kill the air. germs and removes odors. 4. A control method of a preferred plasma purification device according to claim 1, characterized in that: the electrodes of the plasma generator are connected to the output of the high-voltage power supply, and the digital DC power supply can control the output voltage of the high-voltage power supply; High-energy particles and various active ingredients can be produced under the excitation of a high-voltage electric field, and its purification effect can be enhanced when the air pollution is heavy. 5. The control method of a preferred plasma purification device according to claim 1, characterized in that: the nano-photonic hydrogen ion air purifier utilizes ultraviolet rays to irradiate on the nano-photocatalyst material to generate free radicals and active particles, Through the ionization of advanced oxidation particles, the decomposition of chemical harmful gases and odors, the removal of particulate matter, and the killing of bacterial and microbial pollutants, so as to achieve the effect of air purification. 6. The control method of a preferred plasma purification device according to claim 1, characterized in that: the digital DC controllable power supply is connected to the high-voltage power supply through a thyristor, and the thyristor is connected to the controller, which can The working state of the thyristor is controlled by the controller; the nano-photonic hydrogen ion air purifier is connected to the controller through the thyristor, and the working state of the thyristor is also controlled by the controller.

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