Abstract
Experimental studies have been carried out to study the effect of the location of the blade vortex from the end of the flue (the flow outflow from the flue to the separation chamber) by the value Vjmax and the determination of the optimum cross section where Vjmax is reached, and also the study of the influence of structural changes on the purification efficiency. The dependence of this swirler on the value of the tangential velocity of the gas flow at its exit from the separator is established. The cross-sections of the flue duct in which, after the swirler, the maximum values Vj, Vr are reached, the features of the dust-gas flow in the studied sections are considered. Based on the studies of the hydrodynamic situation during the flow of a rotating flow in the flue after the swirler, the possibilities of agglomeration of dust particles in the investigated zones, as well as the destruction of NOx gas impurities, are analyzed. During the operation of the reconstructed vortex dust collector, qualitative indices are attained, which confirm the expediency of the conducted studies and the expediency of reconstructing the vortex apparatus. It is proved that the installation of the blade vortex enhances the purification efficiency of the dust-gas flow in a vortex dust collector and will allow for a comprehensive purification of the exhaust gases.
Highlights
Many branches of the processing industry in the technological cycle include redistribution of lime production by roasting carbonate raw materials in shaft furnaces using gaseous fuels
At one of the alumina refineries in Ukraine, the basic layout solutions, compulsory heating scheme and technical proposals for the modernization of the existing shaft furnace were adopted in accordance with recommendations [1,2,3,4]
The design of the cyclone furnace includes the supply of a gas-air mixture from the burner and secondary air tangentially to the wall of the combustion chamber
Summary
Many branches of the processing industry in the technological cycle include redistribution of lime production by roasting carbonate raw materials in shaft furnaces using gaseous fuels. The coolant is transferred to the layer of the material to be burned through a hole located in the center of the end wall of the furnace With this design, intensive mixing of the gas-air flow and obtaining a coolant of the same temperature throughout the entire volume is carried out. Secondary air is supplied through three nozzles, which are located every 120о and provide tangential input of secondary air In this case, the secondary air intake is made from the gas recirculation manifold in which the main mass is the gas withdrawn from the shaft furnace into the flue and previously purified from dust to a content of less than 70 mg/m3 and having a temperature of not less than 180–200 °C.
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