This section provides an overview for stirring tanks as well as their applications and principles. Also, please take a look at the list of 10 stirring tank manufacturers and their company rankings.
Table of Contents
Stirring tanks represent tanks used for stirring. They are used to mix dissimilar solids, liquids, and gases.
The structure consists of a motor, reduction gear, shaft seal, shaft, agitator blades, baffles, and the tank.
The shape of a stirring tank is indicated by the ratio of the liquid surface height to the tank's inner diameter. Generally, a ratio of 1.0 to 1.5 is considered efficient. If the tank is too thin, the top and bottom agitation will not work well and a concentration gradient will easily occur, while if the tank is too thick, the tank diameter will become too large and the tank will need to be thicker.
Depending on the use of the stirring tank, related components such as coils, jackets, baffles, and nozzles are installed. When installing these parts, they must not interfere with the flow in the tank and must be structurally strong.
Coils and jackets are used for heating and cooling. Cooling water or steam is passed through them. Baffles are used to add flow in the vertical direction as well as in the horizontal direction to the axis. They are also called "obstruction plates." The effect is achieved by installing 2 to 8 baffles per tank. Nozzles are often used to fill and empty the tank. Gas can also be added through nozzles at the bottom of the tank for bubbling.
A motor rotates to transmit power to the shaft. If a speed reducer is attached, the motor will decelerate and increase torque accordingly. The inside of the tank can be sealed without interfering with the rotation, thanks to the shaft seal. Generally, gland packing or mechanical seal is used for the shaft seal.
When the shaft rotates, the agitator blades rotate simultaneously. Thrust and radial forces, depending on the shape of the stirring tanks' blades, cause the liquid in the stirring tank to be agitated. The agitated liquid is further dispersed by baffles attached to the tank. The baffles are used to change the flow from laminar to turbulent. Baffles are usually used for laminar flow, especially in the agitation of low viscosity areas.
The tank shape affects how well the liquid is dispersed. The shape of the tank bottom has a particularly large effect on liquid accumulation. A 2:1 semi-elliptical or 10% dish shape is commonly used. If the ratio of the liquid surface height to the tank's inner diameter is 1.2, the tank inner diameter can be calculated by multiplying the liquid volume by 1.14 and then multiplying by 1/3.
Agitation blades are the part of a stirring tank that transmits the rotation of the motor to the tanks and agitates the raw materials. The role of the agitator blades can be broadly divided into two: "shearing action," which provides shearing force to various parts of the Stirring tanks, and "circulating action," which provides the formation of a circulating flow. Shear force is a force like cutting something with scissors.
When selecting an agitating blade, it is necessary to select one with the optimum balance to achieve the objective based on the viscosity of the material to be agitated.
The following is a list of typical agitation blades used in stirring tanks.
There are several types of agitation methods for stirring tanks.
*Including some distributors, etc.
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