| As one of the key industrial pollution control industries in my country,the brick and tile industry has become more and more important to the treatment of air pollutants in the brick and tile industry with the increasingly stringent environmental protection standards and related requirements of industrial policies.This paper studies the flue gas purification system of a tunnel kiln with an annual output of 60 million bricks.The integrated dust removal and desulfurization purification equipment can ensure the compliance of flue gas emission,but in the actual operation process,the purification system has equipment fouling and defogging.The problem of clogging and wall corrosion has affected the stable operation of the purification equipment.This paper conducts an experimental analysis on fouling products,which are mainly from the flue gas and particulate matter in the desulfurization cycle system.Therefore,the flow state of the flue gas field in the integrated equipment is studied,how to improve the efficiency of dust removal and desulfurization,and solve the problem of the actual operation process of the equipment.The existing problems in the brick and tile flue gas purification efficiency are of great significance.The research uses computational fluid dynamics(CFD)method to carry out numerical simulation,and analyzes the gas-liquid two-phase flow in the streamlined mist eliminator in the tunnel kiln flue gas purification system with an annual output of 60 million bricks and the interior of the integrated dust removal and desulfurization equipment The flow field was simulated and analyzed.The flow state of the flue gas field was optimized by changing the inlet flue angle and arranging the air flow deflector at the flue gas inlet to ensure that the uniformity of the cross-sectional air flow velocity distribution satisfies the relative root mean square The index requirements of the purification equipment have improved the efficiency of dust removal and desulfurization of the purification equipment;at the same time,the relationship between each parameter and the efficiency of the streamlined mist eliminator is also explained.Analyze the flow field of the original design plan,and then propose a targeted improvement plan,and finally get the following results:(1)Analyze the gas-liquid two-phase flow process in the streamlined mist eliminator in the wet flue gas desulfurization system,study the movement trajectory of the particles,and discuss the effects of gas velocity,plate spacing and droplet diameter on the efficiency of the folded plate defogging The simulation of gas-liquid two-phase flow provides a reference for the research and design of an easy-to-clean,high-efficiency streamlined mist eliminator suitable for brick flue gas.(2)Perform experimental tests on equipment fouling and analyze the reasons,and use numerical simulation methods to analyze the flue gas flow field of the integrated dust removal and desulfurization equipment.The flow field has shifted,showing that the flue gas flow rate is faster in some areas.,The uneven flow field distribution of each spray section and wet power inlet section will reduce the efficiency of dust removal and desulfurization and affect the stable operation of purification equipment.(3)Through simulation,it is determined that changing the inlet flue angle and adding baffles can effectively change the flow field state of the flue gas.After optimization,the velocity of each section relative to the root mean square value is significantly reduced,and the gas-liquid mixing inside the equipment is more uniform,The dust removal efficiency of Tower 1 increased from 68.5% to 76.8%;the cross-sectional velocity of the electric field inlet of the wet electrostatic precipitator of Tower 2 was reduced to 0.22 relative to the root mean square,and the flue gas flow deviation exceeding ±15% was controlled to 12,which exceeded The ±20% is controlled at one to ensure the stable emission of atmospheric pollutants at the flue gas outlet. |
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