Research On The Mechanism And Prevention Measures To Flue Gas With Water

Limestone-gypsum wet desulphurization technology is now a mainstream flue gas desulfurization technology.The system generally cancelled the flue gas heat exchanger,But in the operation process,often exists serious phenomenon of flue gas with water,caused severe impact and damage to the environment.flue gas with water after desulfurization is the main reason why produce "gypsum rain".For the problem of flue gas with water which after the absorption tower in the wet desulfurization process,based on the CFD numerical simulation technology,this paper around the generating mechanism and the prevention measures of flue gas with water,has carried on the theoretical analysis and simulation study,and mainly discussed the implementation plan of optimizing the demister structure to strengthen the mist elimination effect.For the technological process and working mechanism of wet desulphurization system,Have a system analysis in formation mechanism and influencing factors of flue gas with water.Put forward strengthen the mist elimination effect,higher net flue gas temperature and to optimize the design of the chimney can effectively solve the phenomenon of flue gas with water.Among them absorption tower lower demisting efficiency is the main influencing factors.So strengthen the demister mist effect is the most direct and effective measures of flue gas with water.Discusses the general method of the mist eliminator CFD simulation.Under the condition of demister internal working stability,the flow of the blade channel conditions are similar,so the corresponding simplified the demister.Select any two area between the mist eliminator blades.When to solve by the Fluent software,using second-order discrete format to match using triangular grid,meshing the mist eliminator two-dimensional model,establish a gas-liquid two phase flow model,continuous phase gas use RNG k-epsilon turbulence model,discrete phase droplets choose particle track model,Under the steady state condition,have the numerical simulation on the gas-liquid two phase flow In the mist eliminator.For a certain type of demister products,Under the determine flue gas running condition,under the certain pressure drop condition,inorderTo have higher demisting efficiency as the optimization goal,study the structural optimization.through simulate four different mist eliminator vane type to determine the streamlined two channel barbed plate as the best demister plate type;On the basis of the existing barbed plate,to simulate the demister plate spacing,Results showed that the plate spacing 30 mm,there are lower pressure drop and higher efficiency of mist.Under the condition of certain plate spacing,to simulate the structure and location parameters of the barb.Hook straight length 20 mm ?hook arc period of turning radius25 mm?hook arc period of turning angle 35°,and barb height location falling 10 mm.Under the same process parameters,the optimized barb demister compared with the existing mist eliminator,demisting efficiency can be increased by 12.5%.Studies have shown that optimize the demister structure parameters,can be improve the demister demisting efficiency,reducing humidity of flue gas after the desulfurization,reduce the produce of gypsum rain.