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Reactor stirrer power by what factors
Dec 07, 2017

As the built-in equipment of the reaction kettle, the agitator is an important device to ensure the full mixing of the material. The stirring power of agitator is related to the state of material flow in the reactor. Therefore, the factors that affect the flow state are also important factors that affect the agitation speed of agitator.


The geometric parameters and operating parameters of the reactor agitator: the pulp diameter, the pulp width, the blade angle, the speed, the number of blades, the height of the blade to the bottom of the tank and so on. The geometric parameters of the stirred tank of the reactor: the inner diameter of the tank, the depth of the liquid, the width of the baffle, the number of baffles, the size of the guide tube and so on. The physical parameters of the stirring medium: the viscosity of the liquid phase and the acceleration of gravity and so on.


Because the power of the agitator in the reactor is to study its power consumption from the operating conditions of the geometric parameters of the agitator itself, so we cannot see the different influence of the stirring purpose in the influencing factors. In other words, as long as the above parameters are the same, it does not ask what stirring process is carried out, and the power of the agitator of the reactor is the same.  These factors can be summed up as the geometric variables of the slurry, the groove, the operating variable of the pulp and the physical variables that affect the power. Trying to find the relationship between these variables and power, that is, to solve the problem of the power calculation of the agitator.


We know that the law of conservation of mass and momentum should be observed in the flow of stirred medium. For a Newtonian fluid density, said local pressure and the local velocity relationship is a dimensionless form of the Navier Stokes equation can be obtained by a Navier Stokes equations. Therefore we can paste diameter as a characteristic length, the speed of agitator reciprocal characteristics as the amount of time, the liquid density and the diameter of the product characteristics as cubic pulp quality, blade diameter and stirring speed of the product characteristics as a metric, and then export the dimensionless velocity and dimensionless pressure, into a Stokes is the Neville dimensional form. The dimensionless equations can be seen in the dimensionless pressure, into a Neville Stokes equation is the dimensionless form. From this dimensionless equation can be seen, the dimensionless velocity and dimensionless pressure are two dimensionless groups, Ruozhun number and function. The ratio of the fluid inertia force to the viscous force is expressed in Europe, and the ratio of the fluid inertia force to the gravity is expressed.


Power is the rotation speed and the distance of the product, and can torque from the local pressure distribution of the blade surface, so we can calculate the relationship between dimensionless. The baffle is a kind of agitating tank accessory which changes the flow state of the tank. Through the study of the vertical baffle on the side wall, it is proved that the width, the number and the installation method of the baffle will have certain influence on the flow and the power of the mixer will also be affected. Under the condition of full baffle, the power of the agitator is the largest. When the baffle plate meets all baffle conditions, the power of the agitator will not increase even if the attachment is added. Under normal circumstances, four baffles can be close to the full baffle condition. In addition, the factors that affect the power of the agitator in the reactor also include the properties of the material and the production process.


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