Graduate qualifying work Theme: Selection and calculating of zinc sulfate production technology

The fluidized bed is characterized by a constant temperature at all points and intense heat transfer (t = 940-980 ° C). It should also be noted that the fluidized bed is characterized by high values ​​of thermal conductivity of the layer itself, which reaches 2500 W / m2 0С and more. Consequently, temperature leveling across the layer occurs at high speeds. When blowing from below through a layer of granular gas material, this layer, under certain blowing parameters (the air flow in front of the furnace is divided into two, one enters the prechamber.

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  The fluidized bed is characterized by a constant temperature at all points and intense heat transfer (t = 940-980 ° C). It should also be noted that the fluidized bed is characterized by high values ​​of thermal conductivity of the layer itself, which reaches 2500 W / m2 0С and more. Consequently, temperature leveling across the layer occurs at high speeds. When blowing from below through a layer of granular gas material, this layer, under certain blowing parameters (the air flow in front of the furnace is divided into two, one enters the prechamber.
  
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  The advantage of oxidative roasting is a consequence of the burning of a concentrate brought into a special state of fluidization. The concentrate is continuously loaded into the working zone of the furnace, and the firing product is gravity-removed from the furnace. The fluidized bed is characterized by a constant temperature at all points and intense heat transfer (t = 940-980 ° C). It should also be noted that the fluidized bed is characterized by high values ​​of thermal conductivity of the layer itself, which reaches 2500 W / m2 0С and more. Consequently, temperature leveling across the layer occurs at high speeds. When blowing from below through a layer of granular gas material, this layer, under certain blowing parameters (the air flow in front of the furnace is divided into two, one enters the prechamber, the other into the main part of the furnace) to such a state that it acquires the properties of a liquid. The fluidized state occurs at the speed of the gas stream, when its lifting force will be balanced by the mass of bulk material. With minimal critical velocity, the layer of bulk material goes into a pseudo-liquid state, and at maximum into a suspended state with free flow of particles. In the working space of the furnace above the level of the fluidized bed, some of the smaller grains are suspended in suspension. To activate the firing of this component of the charge in the zone of suspended state serves a secondary blast.