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    Present Situation and Progress of Flue Gas Denitrification Technology in Glass Furnace

    From:CHANGZHOU ZHONGBO GLASS MACHINE AND EQUIPMENT CO.,LTD  Date:2019-3-25 14:09:01

    According to relevant regulations, the concentration of NOX in flue gas of glass furnace in China should not exceed 700 mg/m3. However, the concentration of NOX in the flue gas of glass melting furnace in most glass manufacturing enterprises does not meet the relevant standards, and the pollution to the environment is relatively large. In view of this, in order to reduce industrial pollution, the application process and research progress of flue gas denitrification technology in glass furnace are studied in this paper.

    1. Analyzing the Importance of Flue Gas Denitrification Technology in Glass Furnace

    In the glass production enterprises, through the rational use of glass furnace flue gas denitrification technology, can ensure the effective removal of harmful substances inside the glass, reduce environmental pollution, and provide a more stable living environment for people. Through detailed analysis of glass furnace flue gas denitrification technology, can effectively enhance the economic benefits of glass production enterprises, and promote better development of enterprises. In recent years, due to the continuous reform of relevant national policies, glass manufacturers have realized the importance of using glass furnace flue gas denitrification technology to reduce industrial pollution.

    2. Application Status of Flue Gas Denitrification Technology in Glass Furnace

    2.1 High Temperature SCR Flue Gas Denitrification Technology

    Because the concentration of flue gas in glass furnace is relatively high, it can reach 265 mg/m3. If the reasonable denitrification technology is not adopted, the ecological environment will be harmed. In glass production enterprises, in order to ensure the quality of glass production, relevant staff need to add appropriate amount of NaSO4 in glass furnace. NaSO4 occupies about 6% of the glass ingredients, which makes the dust particles of glass furnace flue gas bigger and contains a certain amount of NaSO4 particles. Because NaSO4 particles in glass furnace can dissolve in water, a large number of sodium ions will be produced when combined with water. Initiate catalyst poisoning. Reasonable application of SCR flue gas denitrification technology at medium and high temperatures can ensure that the flue gas concentration of glass furnace keeps decreasing, and effectively reduce the production of NaSO4 particles.

    In order to ensure the better application of SCR flue gas denitrification technology, the relevant staff in glass production enterprises should choose reasonable catalysts in practical work. At present, the denitrification catalysts commonly used in glass enterprises are mainly divided into honeycomb catalysts, plate catalysts and corrugated catalysts. Among them, honeycomb catalysts are widely used. Compared with plate catalysts and corrugated catalysts, honeycomb catalysts have larger specific surface area and good heat resistance. When the temperature in glass furnace is too high, they can still be used. Enough to maintain good activity.

    2.2 Low Temperature SCR Flue Gas Denitrification Technology

    Compared with medium and high temperature SCR flue gas denitrification technology, the reaction temperature of low temperature SCR flue gas denitrification technology is lower, mainly at about 200 C. In order to ensure the activity of catalyst in glass production enterprises, a reasonable waste heat furnace should be set around the glass furnace, so as to ensure that the temperature inside the glass furnace meets the relevant regulations and improve the utilization rate of low temperature SCR flue gas denitrification technology. For glass manufacturers, in the process of using low-temperature SCR flue gas denitrification technology, it is unnecessary to reform glass furnace to effectively reduce the operation cost of enterprises.

    In order to ensure the better application of low temperature SCR flue gas denitrification technology, the relevant staff in glass production enterprises need to use low temperature SCR catalyst scientifically in their actual work. The commonly used low temperature catalyst is Co-Ce-Mn/TiO2 metal oxide catalyst. By using low temperature SCR flue gas denitrification technology reasonably, the denitrification efficiency in glass can be guaranteed and the generation of dust can be reduced. However, in the process of using low temperature SCR flue gas denitrification technology, there are also some defects, such as waste heat in glass furnace has not been rationally utilized, resulting in waste of resources.

    3. Research Progress of Flue Gas Denitrification Technology in Glass Furnace

    3.1 Denitrification Technology of Flue Gas Circulating Fluidized Bed

    Flue gas circulating fluidized bed denitrification technology mainly refers to the effective removal of flue gas and sulfide in glass furnace, and further improve the quality of glass production. Due to the continuous progress of glass production technology, flue gas circulating fluidized bed denitrification technology is also constantly improving. In glass production enterprises, through the rational use of flue gas fluidized bed desulfurization equipment, it can ensure the effective removal of harmful substances in glass melting furnace. The relevant staff in glass production enterprises can add appropriate amount of KMnO4 in glass melting cellar, and add appropriate additives, which is effective. Improve the denitrification rate of glass furnace.

    In the process of applying flue gas circulating fluidized bed denitrification technology, the relevant staff in glass manufacturing enterprises can use the original flue gas fluidized bed equipment, effectively reduce the equipment procurement cost of enterprises, and improve the reaction rate inside the glass furnace. However, there are some shortcomings in flue gas circulating fluidized bed denitrification technology. Because the application scope of fluidized bed denitrification technology is relatively small, the effect of glass furnace denitrification is reduced.

    3.2 NaClO oxidation denitrification technology

    The application process of NaClO oxidation denitrification technology is as follows: Firstly, relevant workers in glass manufacturing enterprises need to add appropriate NaClO solution in glass melting cellar, NaClO can directly oxidize NO in glass flue gas; Secondly, adding appropriate desulfurizer in glass melting furnace to ensure the effective removal of SO2 and NOX in glass; Detecting the concentration of flue gas in glass melting furnace, if so. Excessive solubility of flue gas indicates that NaClO solution is less added.

    At present, the application of NaClO oxidation method is relatively small, and it is still in the preliminary stage of research. According to the related research, the concentration of flue gas in glass furnace can be reduced and the quality of glass production can be improved by using NaClO oxidation method reasonably. In order to ensure the better application of NaClO oxidation method, relevant researchers should properly intensify their research efforts and carry out scientific popularization to continuously improve the denitrification rate of NaClO oxidation method.

    3.3 Ozone Desulfurization and Denitrification Technology

    Ozone desulfurization and denitrification technology mainly refers to adding appropriate amount of O 3 in glass melting cellar on the basis of desulfurization and denitrification technology. O3 has good oxidation ability, which can ensure better oxidation of NO in flue gas of glass melting furnace, oxidize NO to NOX, and improve the denitrification and desulfurization rate of glass melting furnace. Ozone desulfurization and denitrification technology has been widely used in boilers, minerals and other enterprises. However, the application of ozonation desulfurization and denitrification technology is less in glass production enterprises. According to the relevant statistical data, it can be shown that the combination of ozonation desulfurization and denitrification technology and wet denitrification and desulfurization technology can effectively ensure that the denitrification rate in glass furnace reaches about 69%.

    By reasonably using ozonation desulfurization and denitrification technology, the production investment of glass production enterprises can be effectively reduced and the quality of glass production can be further improved. However, because of the high preparation cost of O3, the application of ozonation desulfurization and denitrification technology is affected to a certain extent. In order to ensure the effective application of ozonation desulfurization and denitrification technology, relevant researchers need to reduce the preparation cost of O3 appropriately and ensure the flue gas concentration in glass furnace within the prescribed range.

    4. Concluding remarks

    The research progress of flue gas circulating fluidized bed denitrification technology, NaClO oxidation denitrification technology and ozonation denitrification technology are introduced in detail, which can ensure better control of flue gas concentration in glass furnace and improve the economic benefits of glass production enterprises. Relevant researchers should strengthen the research of denitrification technology in glass melting cellar, reduce smoke pollution, ensure the effective utilization of waste heat in glass melting furnace, and promote the rapid development of glass manufacturing enterprises in China.

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