Function introduction of air purifier activated carbon filter
The activated carbon itself is pulverized and screened by carbonaceous materials, and then placed in a carbonization activation furnace for high-temperature catalysis or chemical catalysis, so that a large number of small pores colluded with each other are formed on the surface of the carbon, and a honeycomb structure is formed which is crisscrossed. It is made by pickling or washing with water and drying. Relying on the carbon honeycomb structure, activated carbon can adsorb some pollutants into its own pores, so the larger the surface, the more developed its pore structure and the stronger the adsorption capacity. In addition to strong adsorption capacity, activated carbon is also accompanied by a stable catalytic reaction, so that the activated carbon after adsorption of pollutants catalyzes toxic gases such as formaldehyde when it reaches saturation.
Activated carbon has a strong adsorption capacity, and has good adsorption and purification ability for indoor formaldehyde, benzene, toluene, xylene, TVOC, and other harmful gases. Activated carbon is usually used for the following purposes:
1. Water purification
2, anti-mite and mildew
3, indoor sterilization
4, indoor environmental protection detoxification
Activated carbon is able to remove harmful substances such as formaldehyde. Putting activated carbon inside the gas mask instead of placing other substances can already explain the problem.
If you want to buy a few kilograms of activated carbon, you want to completely remove the formaldehyde in the newly renovated house, then you are wrong because the amount of kilograms is not enough.
Because activated carbon is mainly static adsorption, the closer the harmful gas molecules are, the better the effect. That is to say, when the activated carbon is placed in a fixed place in the room, it only adsorbs the polluting toxic gas molecules that are free in the air near it. Ventilation of the window allows the air to flow so that harmful gases in the distance can be adsorbed. Because of this principle, the moisture, carbon dioxide and other substances around the activated carbon are also adsorbed, which reduces the ability of formaldehyde pollution.
Therefore, we add an activated carbon filter to the air purifier, and the centrifugal fan of the air purifier runs at high speed to accelerate air circulation. The air inlet of the purifier is completely passed through a layer of activated carbon and is subjected to the interception and sterilization of the subsequent filter to achieve the function of purifying indoor air pollution.
However, although activated carbon does not refuse to be toxic, it is easy to be saturated, especially in an indoor environment that is heavily polluted after renovation.
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The classroom should be equipped with an air purifier with disinfection and sterilization functions.
Not only did the parents choose to send their children to school in the fog, so the air quality in the classroom became the focal point of the family. Not only do the parents want to add air purifiers to the school.
But how do you choose an air purifier suitable for classroom installation?
/ Zhang Jian, chief physician of Pediatrics, Beijing Chinese Medicine Hospital:
At present, the air purifier is mainly for household use, and the home environment variable is small and relatively effective.
However, in school, especially in the classroom, it is a public space. The school classrooms are mostly 65 square meters of standardized buildings, and the factors affecting the environment are more complicated.
“Recently, some children have a fever and a dry cough, which is also related to viral infection.”
Therefore, an air purifier with disinfection and sterilization functions should be installed in the classroom.
/ Vice President of China Academy of Environmental Sciences Chai Fahe believes that:
Air purifiers need to be closed for doors and windows. There are many people in the classroom, but the environment is too closed for the body.
If you say that while purifying the air, it also has a bactericidal function, which invisibly creates an invisible protective wall for the classroom to isolate the bacteria and protect the health of the students.
If you want to add, you should choose an air purification device that can remove PM2.5 and sterilize.
/ A small school principal in Haidian District, Beijing said:
The air purifier should be used in a relatively closed environment. The carbon dioxide exhaled by dozens of students will make the air in the classroom very turbid. It will be boring in the classroom for a long time, which is not conducive to the health of the students, but also easy to cause flu, hand, foot, and mouth. Epidemic diseases such as diseases.
It is necessary for schools to purchase air purifiers with air disinfection.
/ Parent representative:
There are many students in the school classroom, the seats are very close, and the children’s resistance is insufficient. It is inevitable to be infected with some epidemic diseases. It is very hard for children to go to school. If the smog weather is still in class, it is a test for the child’s body.
I hope that the school can install air purification equipment with air disinfection function to ensure that children are not harmed by bacteria, viruses and air pollution in school.
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The descriptions of the three-car air purifiers used in the experiment clearly stated that “fine particles of 0.3 microns or more can be removed”. So, can they remove PM2.5?
On the day of the experiment, the concentration of outdoor PM2.5 was 328 μg/m3, which was serious pollution. The car used in the experiment was a home sedan. First, open the window, let the outdoor airflow into the car, then close the window, air conditioner, and the inside and outside of the car. At this time, the initial concentration of PM2.5 in the car is approximately 227 μg/m3.
Subsequently, three-car air purifiers took turns to appear. After 20 minutes of purification, the test results will follow. No. 1 purifier with a value of 880 yuan, the PM2.5 in the car is attenuated from the initial concentration of 276 μg/m3 to 42 μg/m3, and the air quality is good; the second value is 569 yuan purifier, the PM2 inside the car .5 from the initial concentration of 274 μg / m3 to 30 μg / m3, the air quality is excellent; the third value of 150 yuan purifier, the PM2.5 from the initial concentration of 269 μg / m3 to 98 Micrograms per cubic meter, the air quality is slightly polluted.
From the data point of view, the three purifiers can remove PM2.5, which one is better? Don’t worry, let’s look at a set of data. In the absence of a car air purifier, after 20 minutes, the PM2.5 in the car naturally decays from an initial concentration of 277 μg/m3 to 124 μg/m3, and the air quality is moderately polluted. This data is very close to the result of using a 150 yuan car air purifier.
Experiments have shown that a premium car air purifier can remove PM2.5. Experts from the Building Environment Testing Center of Tsinghua University said that to get a good effect of removing PM2.5, you should choose a car air purifier with a CADR value (Clean Air Delivery Rate) of 7 or higher. The little friends who have the car learned how to choose the in-car purifier, and then quickly forwarded to the circle of friends, let more people know.
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Control the PM2.5 in the car, is the smart car air purifier reliable?
Olansi’s purification principle is to release the negative ions and the positively charged pollutant particles in the air so that the dust particles such as PM2.5 in the air sink and collide by the positive and negative ions.
In addition, the negative ions can also reverse the polarity of the bacterial protein, so that the viability of the bacteria is reduced or killed, and the effect of purifying the air and eliminating odor is achieved. At the same time, it also emits the same positive and negative ions in the natural environment through a plasma discharge, inhibiting viruses and molds. Taken together, its nominal PM2.5 removal rate is 99%, and the sterilization rate is 98%.
Olansi car air purifies by releasing negative ions and plasma, so it does not need to replace the filter, eliminating the need for post-use maintenance.
Gesture control – easy to operate
How does Olansi with only one power interface implement functional control? Gesture control. When connected to the power supply, just swipe your hand on the top of Olansi, it will start up and work in weak wind mode, then swipe, switch to strong wind mode, repeat this action, shut down.
With such a design, when the vehicle is in an in-vehicle application, the user can blindly operate and judge by the fan sound to ensure driving safety.
In the audio-visual room with 37dB of ambient noise, the noise in the Olansi weak wind mode is 47dB, and the noise in the strong wind mode is 58dB. There is no noise problem. In the daily office environment, it is recommended to turn on the weak wind mode.
Have a car, rest assured
Olansi offers an absorbing car base that fits snugly into the water cup next to the driver’s handrail. However, if you install a driving recorder and take power through the cigarette lighter interface, it can only choose one with Olansi.
Test the purification effect of Olansi in the car. On the same day, Chongqing’s PM2.5 was 75. When it was just on the train, the PM2.5 of the air inside the car was 38, which was not big. A cigarette was placed inside the car, and after a while, the PM2.5 in the car rose to 115. At this time, the Smart strong wind mode is turned on, and when the window is closed for about 20 minutes, the air in the vehicle is restored to about 45, and the effect is obvious.
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For any piece of equipment, after a period of use, in order to ensure the normal operation of the equipment, it needs to be maintained and cleaned, in order to ensure its normal use and service life. Today we will introduce the maintenance methods of household air purifiers.
The household air purifier mainly allows the outside air to enter the interior, and then through the relevant filtering device, all the pollutants in the air are completely filtered out, and finally, the clean and clean air is released. The main maintenance method is mainly in the machine. After working for a period of time, take out the filter in the machine to clean and maintain it. The main methods are as follows:
1. HEPA: You can use a vacuum cleaner to absorb dust from the surface.
2, catalytic activated carbon: half a year to get sun exposure for more than 24 hours, you can restore the activity of activated carbon itself.
3. Ensure that the machine is placed in a stable position while the machine is running. Do not use the purifier near water or volatile flammable materials.
The filter in the air purifier is a very critical component. Its quality is directly related to the working efficiency and working life of the equipment. If it is cleaned regularly, it can ensure the smooth operation of the equipment and improve the purification efficiency of the equipment. Therefore, we must always keep the air purifier clean.
At present, household air purifiers have entered thousands of households. While bringing us fresh air, we must also regularly clean and maintain the air purifiers. Only in this way can we ensure the normal operation and extension of the equipment. Its service life.
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Do not dare to open the window in the fog! How to choose the right household air purifier?
Buy an air purifier 5 steps away~
first step
Look carefully at 5 indicators
According to national standards, a truly effective air purifier should have the energy efficiency indicator “three highs and one low”. Mainly look at these five indicators:
01
High clean air volume
The high clean air volume (CADR) is the purifying effect indicator of the purifier. The larger the CADR value, the stronger the purifying ability of the purifier, and the better the purifying effect;
02
High cumulative purification
The higher the cumulative purification (CCM) value of the high cumulative purification amount, the more the pollutants are purified, and the longer the filter life is;
03
Energy efficiency value
The higher the energy efficiency level of energy efficiency, the more power saving;
04
Low noise
The low noise instrument working noise is generally less than 50 decibels, which is relatively quiet. You can observe the prototype for intuitive experience when purchasing.
05
Environmental label
Environmental Labeling Air Purifiers have strict limits on the CADR values for different application areas for low noise operating conditions.
Second step
Choose according to your needs
To clearly define the purpose of use, select the appropriate product for your home based on your needs.
01
Newly renovated room
Newly renovated rooms, the main source of air pollution is formaldehyde, benzene, TVOC, etc. It is advisable to purchase products with large clean air and high purification efficiency.
02
Coping with PM2.5
Concerned indicators: particulate clean air volume and particulate matter purification energy efficiency.
03
There are patients, old people or children in the family.
If there are patients, elderly people or children in the family, consider the performance of the top 5 home air purifier to remove microorganisms when choosing a purifier, that is, the higher the sterilization rate, the better.
third step
Remember two formulas
1
CADR value ÷ (price × power);
The larger the value obtained, the higher the cost performance;
2
Applicable area = (0.07 ~ 0.12) * CADR;
If the applicable area is 16m2, the product with the CADR value of 150~120m3/h can be selected. The CADR value is too low to achieve the purification effect, and too many resources are consumed.
the fourth step
Check 1 standard
Pay attention to check whether the standard number on the product packaging or the manual is GB/T18801-2015, which indicates whether the purifier is produced according to the new national standard.
the fifth step
Avoid 1 misunderstanding
Carefully purchase a purifier that uses static electricity, negative ions, and other technologies.
Advantages: quiet, power saving.
Disadvantages: It is easy to produce secondary pollution such as ozone, which is unhealthy. The merchants issued reports that they meet the national standards and may only meet the short-term standards and will accumulate pollutants for a long time.
How is the air purifier most efficient?
The purchase of a suitable air purifier does not mean that once and for all, how to use and protect the air purifier is also essential.
Pay attention to the placement position
● Do not use the purifier too close to people. Try not to place it on walls or furniture, preferably in the center of the house, or more than one meter from the wall.
● In addition, when using activated carbon filter and high-efficiency filter, be careful to keep away from fire sources, and avoid falling cigarettes to prevent fire.
● In a house of 80 to 90 square meters or even larger, only a purifier is used, and the effect will be uneven. If you have the conditions, put one in each room is the best choice. Only one, remember one principle: “Where is the person, where is the purifier.”
Timely maintenance and replacement of purifier screens and filter elements
Long-term use and no replacement of the filter element will easily lead to a decrease in the efficiency of the purification of the machine; the continuous accumulation of pollutants may become a source of secondary pollution.
How to judge when to replace the filter?
● Some purifiers have a filter life indicator that can be used to determine when to replace. If there is no indicator light, you can turn on the machine to check the filter contamination. Once the filter is black, it needs to be replaced immediately.
● If you find that the purification effect is significantly reduced or there is odor after opening, you need to replace the filter material or clean the filter in time.
● If the smog is heavy and often turned on, consider replacing the filter element 3 to 6 months.
Proper ventilation
Long-term use of air purifiers, insufficient indoor fresh air, will cause a decrease in carbon dioxide concentration, which may lead to chest tightness, headache, fatigue, and other symptoms, causing respiratory and nervous system diseases.
Polluted weather, do you want to open the window for ventilation?
● Even if there is air pollution outside the window, it is not appropriate to close the doors and windows for a long time. It is still necessary to properly ventilate.
● The air quality can be viewed in real-time, and the window is opened during a relatively good period of time when the air is relatively good and the temperature and humidity are relatively suitable.
☛ So in non-severe smog weather, the window ventilation is still necessary. The principle of pollution weather compliance is “short-opening windows, long closing windows”, and ventilation can be done in a window for about half an hour.
Use a purifier according to the pollution situation
● Purify the PM2.5 air purifier, preferably in case of serious air pollution or indoor environment pollution. If the air quality is good, there is no need to turn on the purifier for a long time.
● Winter can be used in conjunction with a humidifier for better results. However, if you choose a purifier with a humidifying function, you should be careful not to use it in the summer rainy season, sauna day or high humidity, otherwise the purification effect will be greatly reduced.
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Is there a home quiet air purifier worth recommending?
If you have used an air purifier, you will find that the air purifier noise seems to be much larger than other household appliances, especially when the maximum gear is turned on, even exceeding the noise of the electric fan. Many people scream when they buy a home, even if they have a good purification effect, they feel like inferior products.
In fact, the noise has always been one of the most difficult problems in air purifiers. If we want to increase the purification efficiency, we can increase the filter area and increase the fan speed, but these will increase the wind resistance and increase the noise. How to choose an air purifier with performance and quiet? We uncover the source of noise and see who is the most “low-key”.
First, motor noise
Most home appliances have noise generated when the motor is running, and air purifiers are no exception. The noise of the motor is actually well solved, and it is ok to purchase a professional brand motor with more cost. However, there are many brands that lose quality in order to save costs, and put a lot of money on the more intuitive functions of the products, so that the actual experience of the products is extremely poor.
Second, resonance noise
The vibration brought by the operation of the fan, the quality of the bearing and the dynamic balance of the impeller directly lead to the level of vibration of the whole fan. Air purifiers with high performance are generally large in size. If the design mechanism is unreasonable and the quality details are not good, the noise will be increased in the later stage. When purchasing, be sure to look at the professional top-rated home air purifiers. The noise level is the key factor to check the quality of the product.
Third, the wind channel noise
Wind channel noise is the main source of noise for top room air purifiers, unlike direct air blows. The fan presses the unfiltered air into the filter element, filters through the multi-layer composite filter, and exits the air duct. Due to the strong wind resistance of the composite filter, the noise will increase significantly, and if the air duct design is unreasonable and the turbulence is more, the noise will be very large.
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When the air purifier is working, the micro-fan (also called the ventilator) in the machine enters the air to be filtered from the air inlet and flows through the filter screen. The formaldehyde in the air is filtered by the high-efficiency formaldehyde removal filter and HEPA filter in the filter. The net is decomposed so that the formaldehyde content in the circulating air will continue to decrease, and the air purifier with negative ion function can also release the high-energy negative ion micro fan to send out the negative ion gas stream and the formaldehyde in the air for a chemical reaction. The reaction decomposes the formaldehyde in the air.
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The advent of winter has caused the popularity of the empty net market, and consumers have begun to shop around. In general, the purchase of household air purifiers mainly needs to consider several performance parameters, including purification efficiency, noise effect, filter life, etc. At the same time, the empty net of these three points is rare, and often the price is more expensive. However, in early November this year, Hammer Technology’s Chang breathing air purifier not only achieved these three points but also the price of 3,499 yuan is more acceptable.
800 CADR=Quick Detachment
For empty net products, the higher the CADR value, the stronger the purification ability and the faster the purification rate. The product with a larger CADR value has an advantage in purifying the air.
The 800 CADR purifier purifies a baby room in just one and a half minutes and purifies a living room in just four and a half minutes. This is a purification speed that cannot be achieved with low CADR air. In addition, even with such a purification speed, the price of breathing is only 3,499 yuan, only about 1/3 of the big net empty.
This is also in line with the “double rolling” policy defined by Luo Yonghao, that is, the same price, the purification ability is stronger; the same purification ability, the price is lower.
Low noise = interference purification
Household appliances need to balance the two parameters of function and noise. For the empty net, it is to maintain the purification efficiency in the case of low noise and to ensure low noise at the extreme speed. For this balance, Luo Yonghao also defined the concept of “a clean area under acceptable noise” to explain. It’s just that the two breaths are done. In particular, it can still maintain a sleep mode (34dB), there is still 205 CADR purification speed.
High CCM filter = long life
The CCM value refers to the parameter of the cumulative purifying capacity of the air purifier for the target pollutants such as particulate matter and gaseous pollutants under the rated state and the specified test conditions. Simply put, the higher the CCM, the longer the time between filter changes. The smooth breathing ensures that the filter is replaced every six months to one year, reducing the cost of use. In addition, the multi-layer composite filter element that breathes itself can also be efficiently filtered to ensure that each layer of the filter screen performs its duties and maximizes the purification effect.
It is worth noting that the Breathing Air Purifier uses the H13 HEPA filter, which is currently the highest level of household net filter, which can effectively filter harmful substances such as PM2.5, pollen, allergens, bacteria, viruses and second-hand smoke. The single filtration efficiency of particles with a diameter of 0.3 microns or more also reached 99.97%.
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Air quality is a health topic that Chinese people have been paying close attention to in recent years. With the increase of national environmental governance, China’s air quality has been improving year by year. However, many people are still willing to add a top 10 home air purifier. So, how much can a domestic air purifier improve indoor air quality?
How much is the advertisement really true?
Atmospheric particulate matter is the primary pollutant in most cities in China, and it is also the main cause of the large-scale haze weather in China in recent years.
The increase of fuel combustion in the heating period in the northern part of the country, coupled with the meteorological conditions in some periods is not conducive to the spread of particulate matter, resulting in frequent foggy weather in the northern cities of China in the north and south of Beijing represented by the Beijing-Tianjin-Hebei region.
Studies have shown that urban residents (especially middle-aged or chronically ill patients) spend more than 80% of their time indoors, and indoor air quality has a significant impact on their health. In the short-term failure to reduce the concentration of atmospheric particulate matter, the use of artificial air purification devices to reduce indoor particulate matter concentration is one of the effective means to reduce the health risks caused by particulate exposure.
Materials and Methods
1. Measurement object and time
The study initially recruited 21 residents from Haidian District, Beijing to cooperate with the study. A total of 15 homes were included after excluding non-natural ventilation, near construction sites, indoor smokers or pet houses.
The monitoring of all dwellings was completed from November 2015 to January 2016.
2. Main equipment
The air purifier is a household HEPA purifier with a filter particulate matter and a clean air output ratio ranging from 200 to 299. It is declared to be 31 to 40 m2 by the manufacturer.
A dust monitor (hereinafter referred to as “dust meter”) is used to simultaneously monitor the indoor and outdoor PM2.5 and PM10 concentrations.
A multi-channel particle detector (hereinafter referred to as “multi-channel instrument”) is used to monitor the concentration of particles of different particle sizes in the chamber before and after the operation of the purifier.
3. Monitoring method
The purifiers are placed in the living room, and the gears are opened to the mid-range, which is more than 3 m away from the sampling head of the indoor monitoring instrument. Within 3 hours after the purifier starts running, inform the tenants not to perform indoor cleaning and reduce walking. Residents do not open windows during the monitoring period and try to reduce the number of indoor cleaning.
The monitoring instrument was installed in the residential living room of the research object in an open position 1 m above the ground. In each residential room, two sets of dust meters were used to monitor the mass concentration of PM2.5 and PM10 in real-time; a multi-channel instrument was used to monitor the concentration and mass concentration of particles with different particle sizes.
At the same time, each household uses two sets of dust meters to monitor the outdoor PM2.5 and PM10 simultaneously. The switch time is the same as that of the indoor dust meter.
The concentration of indoor and outdoor particulate matter before and after the operation of the purifier was continuously monitored for 24 h for 48 h. Informed consent was signed from the residents of the surveyed home.
The indoor and outdoor particulate matter concentration ratio (I/O value) was used as a parameter to analyze the indoor particulate matter pollution level before and after the operation of the same residential purifier.
I/O value = Cin/Cout. Cin is the concentration of certain particle sizes in the room, and Cout is the corresponding outdoor concentration.
When analyzing the short-time purification efficiency of the purifier on the particulate matter, the I/O value is not sensitive enough, and the particle removal rate η is used for analysis. η=[(C0-C1)/C0]. Among them, C0 and C1 are the indoor particulate matter concentrations after the purifier starts running and after 2 to 3 hours of operation.
result
1. The overall purification effect of the purifier on indoor particulate matter (see Table 1)
After the purifier is running, the I/O value of PM2.5 shows a significant downward trend: among them, the decline of 6 households is above 70%, the decline of 2 households is 55%~60%, and the decline of 5 households is 20%~45%. The I/O value of PM2.5 after the operation of the purifiers of 2 households (7th and 13th households) is slightly higher than before the operation.
After the purifier was operated, the I/O value of PM10 of 6 households decreased by more than 70%, and the decline of 7 households was 14%~46%. The I/O value of PM10 after the 13th household purifier is running is the same as before the operation.
Table 1 Daily average mass concentration I/O value of particulate matter before and after purifier operation
2. Abnormal situation analysis
After the 7th household and the 13th household, the purifier was operated, the I/O value of PM2.5 increased, and the I/O value of the seventh household PM2.5 decreased by less than 20%, and the 13th household did not change.
The monitoring data of indoor and outdoor particulate matter concentration of the two households are shown (see Table 2): the mass concentration of outdoor PM2.5 and PM10 is higher at 24 h before the operation of the seventh household purifier, and the outdoor PM2.5 and PM10 mass concentration after 24 h operation. Very low; the mass concentration of outdoor PM2.5 and PM10 before the operation of the 13th household purifier was lower, and the mass concentration of PM2.5 and PM10 outside the 24h after the operation was significantly higher.
Table 2 Indoor and outdoor particulate matter mass concentration of the 7th and 13th households
3. Purifier’s short-term purification efficiency of indoor particulate matter
The PM2.5 purification rate at different points after the start of purification is shown in Figure 1. The trend of the remaining particle size purification rate curve is similar to that of PM2.5. With the increase of time, the average purification rate of PM2.5 can reach 60%~70% after about 150 minutes after the start of purification.
Table 3 PM2.5 average purification rate in a short time (<3h) after starting the purifier
discuss
In this study, the daily average values of PM2.5 and PM10 in the residential room after the purifier operation were all lower than 100 μg/m3.
After running the purifier, the I/O values of PM2.5 and PM10 in the room decreased significantly, but the I/O values of the 7th and 13th PM2.5s were opposite to the overall trend, and the I/O value of PM10 decreased less. Not even changed.
Further analysis found that when the seventh household was operating in the purifier, the mass concentration of outdoor particulate matter decreased significantly from the previous day, and the mass concentration permeating into the room plummeted. At this low mass concentration, the purifier has a small decrease in the mass concentration of the indoor particulate matter, and its I/O value is even higher than the I/O value formed by closing the door and window to block the penetration of the particulate matter into the room when the outdoor particulate matter concentration is high. The day before the 13th household purifier was operated, the outdoor particulate matter concentration was already quite low. Under the mass concentration, if the door and window of the household are closed, the outdoor particulate matter penetrates into the room less, and the I/O value of the particulate matter is lower than the I/O value after the purifier is purified.
It is concluded that the purification efficiency of the HEPA purifier is low at low concentrations compared to the high particulate concentration.
In the winter heating period, the HEPA air purifier is used as an intervention method to effectively reduce the exposure level of PM10, PM2.5 and smaller particle size in Beijing residents.
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