发布时间：2020-12-16 热度：
化学高分论文代写_专业高分化学论文代写_硕博团队服务
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Types and Principles of Air Purifiers
In recent years, with the improvement of people's living water products and higher requirements for health, air purifier has become necessary electrical equipment in people's lives, especially in our families in China. The existence of formaldehyde is the most significant harm to the human body because there are not a few cases of formaldehyde leukemia in new house decoration, so this is a severe problem, so what type of air purifier is more effective in dealing with formaldehyde? What is its principle? The air purifier is an air purification equipment, which can effectively remove and control various pollutants in the air, including PM2.5, pollen, decoration formaldehyde and so on. I think the air purifier developed at present can effectively research and prepare for air pollutants, and can effectively and thoroughly remove harmful substances in the air - decoration formaldehyde. I will carry out experiments to prove this point.
The air purifier is mainly composed of air filter, driving motor and fan. From the point of view of physics, removal is mainly through filtration. Its working principle is to turn the air purifier into a vacuum state by driving the motor to rotate. At this time, due to the difference of atmospheric pressure between natural air and air purifier, the atmosphere is absorbed. Under the force of the fan driven by the driving motor, clean air passes through, and harmful substances containing formaldehyde are intercepted and collected by the screen. When the air purifier is opened and operated continuously, the ambient air will always enter, and the high-quality air will be continuously discharged to purify and purify the air.
Formaldehyde is ubiquitous in our home decoration. The main harm of formaldehyde is the irritation of skin and mucosa. When formaldehyde reaches a specific concentration indoors, people feel uncomfortable. Formaldehyde concentration greater than 0.08 mg/m can cause eye flushing, itching, sore throat, hoarseness, sneezing, chest tightness, asthma, dermatitis, etc. Formaldehyde content in newly decorated rooms is high, which is the leading cause of many diseases. In the air purifier for formaldehyde removal, the air purifier with warming and humidifying has the best effect for formaldehyde removal. The principle is that formaldehyde is easier to volatilize in high temperature and humidity. After the volatilization of formaldehyde, formaldehyde can be effectively removed by ventilation or air purifier cycle.
I bought a formaldehyde tester and an air purifier on the Internet for the experiment. The formaldehyde tester is Dienmern (China). It can test formaldehyde and the TVOC with a precision of 0.001 mg/m_and AQI with a single digit. The air purifier is Cnano (China). Its mechanical working principle is described above. Cnano claims that its core components (filter part) are carbon nanofibers, which can effectively absorb harmful substances such as formaldehyde. Is it effective? Experiments was done as below.
Cnano Dienmern
The experimental design is as follows:
First, I choose my small bedroom as the experimental object. My bedroom area is 6㎡. First, I am in a closed state. I use formaldehyde tester to test an index of the initial state. Then, open the formaldehyde tester, every half hour to test the various indicators in the bedroom, the number of experiments varies until the value changes little.
The results are as follows:
Serial number formaldehyde（mg/m³） TVOC（mg/m³） AQI Photograph pictures
0.0h 0.038 0.266 031
0.5h 0.024 0.168 019
1.0h 0.010 0.070 008
1.5h 0.006 0.042 004
2.0h 0.004 0.028 003
Based on the analysis of the experimental results, that the bedroom in the initial state of formaldehyde is 0.038 mg/m, the TVOC is 0.266 mg/m, AQI is 031, the main indicators are at a relatively healthy level, not exceeding the health standards; Open the Cnano air purifier, let it run in the maximum state for 0.5 hours, and then proceed. After 0.5 hours, formaldehyde was 0.024 mg/m³,the TVOC was 0.168 mg/ m³and AQI was 019. The overall index was significantly lower than that of the initial state. After 1.0 hours of operation of air purifier, the relevant standard treatment test was carried out at this time, and formaldehyde was 0.010 mg/m³, the TVOC was 0.070 mg/ m³and AQI was 008, the overall index was 0.010 mg/ m³and 0.07 mg/ m³respectively. Indicators have been significantly reduced; after 1.5 hours of operation of air purifier, relevant treatment criteria are tested again at this time, formaldehyde is 0.006 mg/m³, TVOC is 0.042 mg/m³and AQI is 004, and the overall indicators have been significantly reduced; after 2.0 hours of operation of air purifier, relevant treatment criteria are tested again at this time, formaldehyde is 0.004 mg/m³.The TVOC is 0.028 mg/ m³and AQI is 003. The overall indicators have been significantly reduced, but the trend is not significant. Make an analysis through drawing and see the changes of the three directly. At the end of the experiment was that the air quality in the bedroom was no longer significantly improved. From the data of formaldehyde, the decline of formaldehyde is faster at the beginning of 0-1 h, and slower at the next 1-2 h. The TVOC data show that the decrease of formaldehyde is more rapid at the beginning of 0-1 h, and slower at the latter 1-2 h. AQI also has the same rule. The air quality is getting better gradually, and the trend of improvement is more time-consuming. But it is not intuitive enough. I have made the following line chart to show this change.The physical principle of formaldehyde and TVOC removal is mainly the adsorption of formaldehyde into the pore size of activated carbon and other porous substances, so as to achieve the purpose of formaldehyde removal. AQI is a project to monitor the air index, mainly some small particles, such as dust. Their physical principle of removal is to intercept harmful particles in the air through the size of the filter core of the air purifier, so as to achieve the purpose of purifying the air.
As can be seen from the above figure, the formaldehyde index in the bedroom shows a downward trend after the purification of the Cnano air purifier. The change in the beginning time is very obvious. Especially in the first hour, the slope of the linear transformation is greater than 1-2 hours, which indicates that in the relatively high time of formaldehyde to go. The removal effect is noticeable. When the concentration reaches a lower level, the removal effect becomes worse. The changing trend of the TVOC index is the same as that of formaldehyde, and the change in the initial time is pronounced. Especially in the first hour, the slope of linear transformation is greater than 1-2 hours, which indicates that the time of the TVOC is relatively high. The internal removal effect is pronounced. When the concentration reaches a lower level, the removal effect becomes worse. The changing trend of AQI is the same as that of the former two, and the change trend is more obvious. The monitoring of these three indicators shows that Cnano can purify the air, and when the air quality reaches its maximum, the changes of the three signs are all the same. There has been a trend of change.
This experiment is carried out in a relatively small space, and the specifications of the air purifier used are relatively small. I think the conclusions drawn on this basis are also widely tested. As long as the working mechanism of this air purifier and our experimental data support, he can complete the air purification work in a small space, then in an ample area, on the one hand, can achieve the purpose of air purification by increasing the number of air purifiers, on the other hand, before our technology matures. Besides, a larger air purifier can be produced, to achieve the air purification effect of a larger area of space.
The experiments draw a clear conclusion that the existing air evolution equipment in the market can play an active role in purifying the air. It can remove several harmful substances, such as formaldehyde and the TVOC, which are the most harmful to human beings so that they can be reduced and AQI can be improved naturally.
