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With the great changes in environmental supervision, how has the oil fume monitoring system been developed?

by:Rika Sensors     2021-12-02
With the great changes in environmental supervision, how has the oil fume monitoring system been developed?
Since the beginning of the 21st century, air pollution, water pollution, and soil desertification have become the three main aspects of environmental pollution. Among them, air pollution ranks first in China's top ten environmental problems. The so-called air pollution refers to the phenomenon that certain substances are produced in the process of human activities and enter the atmosphere, which endangers the human living environment.

In recent years, my country has implemented compulsory and targeted treatment of air pollution. For example, during the 12th Five-Year Plan period, Premier Li Keqiang proposed the 'Blue Sky Defense War

However, with the rapid development of the catering industry in cities, the problem of surrounding environmental pollution caused by the emission of fume from catering companies has become increasingly prominent, which has become an important environmental pollution problem affecting the health of residents. In recent years, the Environmental Protection Agency has received more reports of oil fume harassing citizens, accounting for more than half of the urban complaint reports. In order to protect the health of residents around the catering industry, it is necessary to strictly limit excessive emission of oil fume. Therefore, it has become a necessity to adopt regulatory measures.

Because oil fume monitoring was limited by the level of monitoring technology in the past, the results measured by the oil fume monitoring equipment were very inaccurate. Most professional monitoring agencies can only use laboratory analysis methods, that is, extract the fume from the pipes where the oil fume pollution is generated. A certain amount of oil fume gas is brought back to the laboratory for detection by chemical reagent dissolution method. This kind of oil fume monitoring method cannot accurately monitor the concentration of oil fume emission, and has certain limitations and hysteresis, and cannot be widely applied and promoted in society.

With the development of wireless communication technology, sensor technology, embedded technology and other technologies, today's oil fume monitoring system can already be portable and accurate without the laboratory. Today's oil fume monitoring system can realize remote real-time monitoring and over-limit alarm. During the monitoring process, the oil fume concentration of each monitoring point is monitored in real time through sensor technology, and the oil fume data of each oil fume monitoring remote monitoring terminal is transmitted to the wireless communication network through the wireless communication network. The company or the environmental cloud platform of environmental protection bureaus for oil fume detection.

There are three monitoring principles in the oil fume monitoring system: electrochemical monitoring principle, photometric monitoring principle, and light scattering detection principle. These three devices break through the limitation that oil fume concentration data can only be quantified in the laboratory. , Has the advantage of real-time monitoring of oil fume, which makes the country's automatic monitoring of pollution sources stronger and more comprehensive, which is conducive to my country's environmental protection work.

Principle classification of oil fume monitoring system:

1. Electrochemical monitoring principle

A sieve sensor with porous positions. When oil fume particles enter the sensor, the sensor’s holes will receive oil fume particles, thereby The resistance of the sieve increases, which will affect the change of the current intensity, because the current intensity and the oil smoke concentration have a linear relationship (proportional relationship), so that the oil smoke concentration can be calculated according to the electric field (current) intensity.

Second, the principle of optical monitoring

Adopt bilateral fixed installation, one end is the transmitting end, and the other is the receiving end. The transmitting end will continuously send out an infrared light wave to the receiving end. When the oil fume particles enter the sensor, astigmatism will be generated when the oil fume particles intersect with the laser beam, and the receiving end will receive such optical changes, so that the concentration of oil fume can be obtained. .

Compared with the electrochemical monitoring principle, its monitoring accuracy is high, the anti-vibration ability of bilateral installation is poor, the value is prone to be inaccurate after deviation, and the outlet vibration of the purifier is large.

3. Principle of light scattering monitoring

According to the measurement principle, the particle concentration measurement technology of light scattering method is divided into two types: static light scattering method and scattering focusing method. According to the size of the scattering angle, the static light scattering method can be divided into forward light scattering method and back light scattering method.

Forward light scattering: The optical lampblack monitor is based on the principle of forward light scattering. A laser beam with a wavelength of 635nm is irradiated into the flue to be measured. The soot particles in the flue cause the laser beam to scatter, and the intensity of the scattered light is proportional to the amount of soot particles. Therefore, the corresponding relationship between the concentration of oil fume and the intensity of the scattered light of the laser can be established. After being calibrated by the standard concentration in the factory, the accurate lampblack concentration can be obtained by measuring the intensity of scattered light. Single-sided installation, good anti-vibration ability; installed with a blowback system, maintenance-free, high precision.

Backscattering: The backscattering method uses the radiation conduction equation of the medium to describe the multi-scattering process, and then selects appropriate boundary conditions to solve the equation. The measuring device of the back light scattering method is also relatively simple, the laser and the photodetector are on the same side, and there is no need for angle calibration.

Concentrated light scattering method: In this method, the monochromatic light source (infrared) of the monitoring channel is in a straight line with the receiving end. When the sample enters the monitoring channel and converges with the red light to generate scattered light, the receiving end receives this optical The changes are converted into digital signals (electrical signals), which are amplified and transmitted to the detector for display. The accuracy is about 10 times higher than that of the forward light dispersion.



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