Experimental Study On Efficient Curved-plate Dehydration Equipment Of Blast-furnace Gas

With the developing demand of energy-saving and emission reduction, the reuse ofblast furnace gas is attracting more and more attention. The gas of high quality is theimportant condition on which the turbine can be able to operate safely and the economicbenefit can be improved. The mechanical water in gas not only causes equipmentcorrosion, but also decreases the calorific value of gas, so that the mechanical watercontent is required to be removed less than5mg/m3in industrial application.Recently, there are many ways of depriving mechanical water from gas, amongwhich refrigeration and absorption methods have many disadvantages, such as highoperation cost, complicated device and larger occupied space. Mechanical water contentonly can be dropped to5000mg/m3by swirl plate dewatering device and silken screendewatering device, both of which belong to mechanical process. Therefore, a sort ofeffective equipment to remove water from gas is required to solve the problem of highmechanical water content of blast furnace gas.This paper emphasizes the theoretical study on the curved-plate dehydrationequipment’s property. Firstly, a mathematical model on gas-liquid phase separation withinthe curved-plate dehydration equipment was established; the second step is to illustratemotion of droplets and liquid-sheet disintegration’s mechanism as the theoretic foundationfor the research. Through the experiment on the curved-plate dehydration equipment’sfunction and analysis of dewatering efficiency and pressure loss under different influentialfactors, the optimal curve-plate structure parameter and operational parameter to improvethe dehydration efficiency and reduce the pressure loss have been obtained. Thoseparameters of the curve-plate are shown as follows: the optimum gas velocity is1.75~2.25m/s; the space between the curved-plates is5~7.5mm, and the length of the inclined plateis200~250mm. Moreover, the best ratio of liquid and gas is0.2~0.25L/m~3, and theoptimized particle size of water spray is100~500μm. Based on all those factors above,highest dewatering efficiency and least resistance can be obtained to make thecurved-plate dehydration equipment’s performance work best. Finally, the experientialformula among curved-plate dehydration efficiency、pressure loss and their parameters was set up by the application of regression analysis.New equipment devised has such advantages as higher dewatering efficiency, lesspressure loss, easy manufacture, etc. In addition, this device is able to remove mechanicalwater of which diameter is below6μm so effectively that the mechanical water in the gascan reduce to lower than5mg/m~3, which has great influence on widespread use andoptimal design of curved-plate dehydration equipment both in theory and practice.