In this scientific article,fluidized bad and its hydrodynamic characteristics were examined in the industry.When stays, the solid particles are dependent. These dependent forms are dynamic fluid properties..sols have a dynamic fluid properties,and the flow of particles in different directions and reminds the whole layer of boiling bed. Fluidized beds are currently used in many commercial processes. There are a number of advantages for particular applications. For example, fluidized beds provide uniform heat distribution avoiding hot spots and hence providing better control over reactions. This attribute is of great importance when a reaction has a narrow operating temperature. Fluidized beds also find applications in heat exchangers because of the high rate of heat transfer between particles, gas and immersed surfaces. Fluidized beds also have a large surface area between particle and gas,and unlike a packed bed, may be relatively well mixed. Fluidized beds also offer better interaction between the solid and fluid phases. In fluidized beds, the particulate phase is able to move which adds into the mixing of phases and hence fluidized beds can sometimes be regarded as well mixed. This mixing coupled with the large thermal capacity of the particle phase enhances thermal transport inside the system and gives good heat transfer between the bed and its container. These aspects also help to maintain a homogeneous temperature field inside a fluidized bed. In addition, the pressure drop across the bed cannot exceed the weight of particles per unit bed area, which can reduce pumping costs.I can say from my personal scientific research experience that a hot layer is used in the only sulfuric acid production plant in Azerbaijan, in the production of acid. In modern contact method,applied to hot layer reactors working with V2O5 catalysts. It is possible to get a stable temperature and high contact surface to transform with oxygen.İs possible to get this with a fluidized beds(hot layer) regime.Catalyst particles is located in this layer.Catalyst particles are kept in boilling in the gas flow,inrease the response surface.The flow regimes describe the action of the substance within the reactor.Why is fluidized beds selected because of the heat is equally distributed it becomes good mix between gas and solis phase.Fluidized bed it is known that many industrial processes are used.