Function of nitrogen dioxide industrial gas sensor in exhaust gas detection

2023-03-31 09:39:16

        With the rapid development of industrial production and enterprises, industrial exhaust emission pollution has become a very prominent environmental problem in China. At present, exhaust gas is an important source of air pollutants. A large amount of industrial waste gas is discharged into the air, reducing the quality of the atmospheric environment, causing serious harm to people’s health and causing huge losses to the national economy.

      In recent years, the monitoring of toxic gases in the production process of chemical industry has attracted more and more attention from factories. Nitrogen dioxide (NO2) is an important industrial gas, which can be used for industrial water treatment as a disinfectant, pulp and fiber bleaching, flour, oil, sugar refining, leather hair removal, etc. At the same time, nitrogen dioxide is one of the toxic gases, its color is reddish-brown and pungent, and it is easily soluble in water. Low concentration (4ppm) of nitrogen dioxide will paralyze the nose and may lead to excessive absorption. Long-term exposure to the environment with NO2 concentration of 40 to 100 mg/m3 will seriously affect health. Therefore, in order to prevent nitrogen dioxide gas from harming the health of workers and affecting production safety, it is necessary to monitor nitrogen dioxide gas in real time.

     The instruments used for NO2 monitoring mainly include analytical instruments based on optical methods such as Sarzmann method and chemiluminescence method. Although these instruments can give analysis data, most of them are large analytical instruments, which require high operating costs and routine maintenance, and are not suitable for indoor monitoring such as factories. Now the more common method is to use electrochemical NO2 gas sensor. The nitrogen dioxide sensor has the characteristics of small size, low cost, etc. It can monitor the concentration of nitrogen dioxide in the environment simply and quickly, and successfully realize the automation and miniaturization of the monitoring instrument.

      The industrialized society has brought about the rapid development of science and technology, but also brought serious environmental problems, such as air pollution. We breathe air every minute, and air quality has a profound impact on our health. However, due to the emission of automobile exhaust gas and industrial exhaust gas, the generated exhaust gas is directly discharged into the air, causing air pollution, leading to various health problems. This makes it particularly urgent to develop low-cost, high-efficiency and high-sensitivity sensors to detect the polluting gases in the air.

      Industrial waste gas refers to the general term of various pollutant-containing gases discharged into the air during fuel combustion and production in the plant area of the enterprise. These waste gases include carbides, sulfides, fluorides, nitrogen oxides and smoke. These harmful substances and gases enter the human body in different ways through the respiratory tract. Some of them directly cause harm to human body, and some have cumulative effects, which will more seriously harm human health. Different substances have different effects.

      Industrial waste gas purification refers to the work that specially pretreates the waste gas generated in factories, workshops and other industrial sites, and then discharges it to meet the national waste gas emission standards. The purified exhaust gas usually needs to be tested to ensure that the exhaust gas meets the emission standards.

      At present, most industrial exhaust gas online monitoring systems on the market use one-to-one measurement methods to simultaneously measure industrial exhaust gas containing various gas components. However, industrial waste gas contains a large number of gas components, and industrial waste gas online monitoring system can only monitor one gas with one instrument. When monitoring various gases in complex gases, it is necessary to install various types of instruments for simultaneous monitoring. The one-to-one instrument monitoring mode not only wastes cost and space, but also increases the workload of monitoring personnel to maintain each instrument.

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