| With the increased requirements of environmental protection, the implementation of power plant desulfurization wastewater treatment requires the "zero emissions" of the desulfurization wastewater treatment. In view of the complex process of conventional desulfurization waste water treatment, the use of flue gas treatment technology is used to desulfurization waste water treatment reducing the pollution and impact on the environment that the initial investment and operating expenses is only 20% of conventional process, and greatly reduce the manual operation and maintenance of the system, besides, improving the desulfurization wastewater treatment efficiency. According to the operation experience of the current related power plant, the spray droplets are easy to move to the wall of the flue wall, leading to scaling and fouling in the flue wall, which is required to be carried out regularly, besides, the acid of the flue gas from the waste water of the wastewater is corroded by the acid.This paper intends to install the gas distribution plate near the wall of the tail flue aim to improve the air velocity in the near wall to form the protective effect on the movement of the desulfurization waste water to the wall which is beneficial to droplets corrosion.Through the numerical study of two phase flow characteristics and atomization characteristics of the spray nozzle, the best performance parameters of the spray nozzle is applied to the follow-up flue simulation. The results show that the numerical simulation results can reflect the working performance of the nozzle in a good way. The spray nozzle can meet the requirements of the large change of the amount of the desulfurization wastewater, and at the same time ensure the stability of the nozzle outlet atomization requirements. the proposed desulfurization waste water inlet rate was 6m/s if the wind speed is in the best combination state of wind speed.Through simulation comparison of the corrosion protection effect of the flue wall and the effect of the droplets evaporation and Mechanism of the effect of the flue gas distribution plate in the two cases of the installation and the non-installation of the gas distribution plate, It is concluded that the installation of the flue gas redistribution plate increases the evaporation effect and the corrosion protection effect of the spray droplets at the same nozzle installation distance, and the optimal distance is d=1.4m when the nozzle is installed; The key areas of the flue wall corrosion is at the front of the flue Z=4m installed the flue gas redistribution plate; the installation of the flue gas distribution plate can effectively regulate the regional gas flow near the wall of the flue gas, and form a steady flow of protection on the wall of the flue gas, which can effectively separate the direct contact between the liquid drop and the wall; the effect of the installation of the first group of the first set of gas and the mixture of the initial area of the mixed initial area of the flue gas and the desulphurization wastewater is the most significant; the flue gas temperature field caused by atomization evaporation is very small, and the change of gas temperature is little; the complete atomization area of the atomization droplets is longer in the direction of the Z axis with the increase of the value of the nozzle installation distance; when the gas redistribution plate is installed after Z=6..0m, it can improve the temperature distribution of the flue wall and play a role in the wall corrosion, while the spray droplets and gas can further improve heat and mass transfer effect of the spray droplets in the complete atomization area.Through the numerical comparison study of the effects of the influence of the flue gas redistribution plate on the corrosion protection to flue wall and the improvement of the atomization evaporation, the results show that optimal installation parameters of the flue gas redistribution board is θ=15°、H=0.1m、L=1.4m、n=8. |
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