Research On The Key Technologies Of Float Glass Tank Flue Gas Desulfrization System

With the worldwide rapid development of glass industry, environmental pollution is becoming increasingly serious. The total number of 300T/D float glass tank in China has exceeded 100, which uses heavy oil and coal as the main fuel, and lets out such contaminant as SO₂, NOx and CO₂. The waste gas from most glass factories is emitted from the chimney without being purified, which results in serious air pollution. According to the statistical data, the total amount of SO₂ emission has reached over 20 million tons in 2006,10% of which is caused by float glass tank, and thus the government attaches much importance to float glass tank flue gas desulfrization.Luoyang Glass Company initially introduces the desulphurization equipment for large-scale glass tank, which is different from its counterparts for boilers in the power plant. The desulphurization equipment should not only be up to the national emission standard, but also it should ensure the stability of temperature and pressure system. The desulphurization process must be performed when the glass tank is still working, which makes it more difficult for operation technology and management.In this paper, the research work concerns the following aspects:(1)The relationship between the technology of float glass tank and the desulphurization system for waste gas was explored. Based on the field tests, analyses were made to seek the best operation parameter and offer theoretical guidance for practical operation.(2)Aided by the mature commercial CFD software, the two-phase currents flow fields model in the spray drier tower of desulphurization for the glass tank is established. It was analyzed and Simulated through the following four aspects: firstly, the effect of flue gas velocity field and flow lines under the conditions of the empty tower (with flue gas and no spray); secondly, the effect of spray in aerosols (smokeless a gas spray)at different positions, such as high, low and the sprinkler spray mixed results; thirdly, the effect of parallel and vertical spray on the condition that aerosols at different angles; lastly, the spray droplet trajectory when aerosols are placed in different spray angles. These provide corresponding theoretical support for desulfurate system of debugging and operation.(3)It is established that a reasonable mathematical model about the sensitive parameters which affect desulfurization efficiency, such as the initial droplet size, flue gas temperature, flue gas velocity into the tower, the consistency of SO2 into the tower. The changes of these parameters in the reaction tower and the law of impact desulfurization efficiency are analyed. A reasonable parameter-control system is built.(4)Quantities of experiments were done for verification and improvement and accordingly a large amount of first-hand information was obtained, which was essential for our company and also important for other enterprises in terms of desulphurization equipment reconstruction.(5)Significant data was built regarding desulphurization technology in large-scale glass tank, which ensured the stability of temperature and pressure system in glass tank. Reliable operation technology and equipment maintenance would be guaranteed so that SDFGD could be successfully applied in the assembly of float glass, making it scientifically reasonable to promote and apply the desulphurization technology of float glass tank in China.(6)The imported desulphurization equipment in Luoyang Glass Company was partially reconstructed in accordance with theoretical analyses, experimental data and testing operation. Achieve excellent result.