The role of nitrogen dioxide industrial gas sensors in exhaust gas detection.

2023-03-17 16:32:13

With the rapid development of industrial production and enterprises, industrial waste gas emission pollution has become a prominent environmental issue in China. At present, waste gas is an important source of air pollutants. The large amount of industrial waste gas that is discharged into the air lowers the quality of the atmospheric environment, poses serious health risks to people, and causes enormous losses to the national economy.

In recent years, the monitoring of toxic gases in the chemical industry production process has received increasing attention from factories. Nitrogen dioxide (NO2) is an important industrial gas that can be used as a disinfectant for industrial water treatment. It can also bleach pulp and fibers, and refine flour, fats and sugars, and remove hair from leather, among other things. At the same time, nitrogen dioxide is one of the toxic gases. It has a reddish-brown color, a pungent odor, and is soluble in water. Exposure to low concentrations (4ppm) of nitrogen dioxide can cause numbness in the nose, and excessive absorption can lead to serious health problems when exposed to NO2 concentration in the environment ranging from 40 to 100 milligrams/cubic meter for long-term exposure. Therefore, to avoid the harm of nitrogen dioxide gas to the health of workers and to ensure production safety, it is necessary to monitor the concentration of nitrogen dioxide gas in real-time.

The instruments mainly used for NO2 monitoring include analytical instruments based on optical methods such as the Sazhman method and chemiluminescent methods. Although these instruments can provide analysis data, they are generally large analytical instruments with high operating costs and require regular maintenance. They are not suitable for indoor monitoring in factories and other environments. The most commonly used method is to use electrochemical NO2 gas sensors. Nitrogen dioxide sensors are small in size, inexpensive, and can easily and quickly monitor the concentration of nitrogen dioxide in the environment. They have successfully realized the automation and miniaturization of monitoring instruments.

The industrialization of society has brought about rapid technological development, but it has also led to serious environmental problems, such as air pollution. We breathe air every second, and the quality of air has a profound impact on our health. However, the direct discharge of waste gas into the air from car exhaust and industrial emissions causes air pollution and leads to various health problems. This makes it urgent to develop low-cost, high-efficiency, and high-sensitivity sensors to detect air pollutants.

Industrial waste gas refers to the general term for various pollutant-containing gases emitted into the air during fuel combustion and production processes in factory areas. These gases include carbides, sulfides, fluorides, nitrogen oxides, smoke, and so on. These harmful substances enter the human body through the respiratory tract in different ways. Some directly harm the body, while others have cumulative effects. This will more seriously harm human health, and different substances have different effects.

Industrial waste gas purification refers to the process of pre-treating the waste gas generated by industrial sites such as factories and workshops, and discharging it to meet the national waste gas emission standards. The purified waste gas usually requires testing to ensure that it meets the emission standards.

Currently, most of the industrial waste gas online monitoring systems on the market use a one-to-one measurement method to simultaneously measure industrial waste gas containing various gas components. However, industrial waste gas contains a large amount of gas components, and one instrument of the industrial waste gas online monitoring system can only monitor one gas. When monitoring various gases in complex gases, various types of instruments need to be installed for simultaneous monitoring. The one-to-one instrument monitoring method not only wastes cost and space, but also increases the workload of monitoring personnel to maintain each instrument.

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