There are two aspects of the electric mixer that are particularly worth noting when choosing:

First, the internal structure of the electric mixer must be reasonable;

Second, the stirrer of the electric mixer must normally drive the entire internal system of the electric mixer to work together. Generally speaking, if it is necessary to meet these two points, it is relatively difficult for the electric mixer itself.

Because the stirrer in the stirrer has a great influence on the stirring state of the liquid viscosity when the electric stirrer is working, so in terms of the internal stirring medium of the electric stirrer, the choice of stirrer is a kind of A relatively effective method.

Several typical agitators have different application ranges according to the viscosity. The order of use of various agitators with increasing viscosity is propulsion, turbine, paddle, anchor and ribbon, etc., where the propulsion is divided finely, and low speed and small capacity are proposed for large-capacity liquids. Use high speed for liquids. This selection chart does not absolutely stipulate the restrictions on the use of the slurry type. In fact, the range of use of the various slurry types overlaps. For example, the slurry type has a simple structure and the baffle can improve the flow pattern. Therefore, when the viscosity is low It is also more commonly used. The turbo type is almost the most widely used slurry type due to its strong convection circulation ability, turbulent diffusion and shear force.

1. The selection table proposed by the electric agitator is also selected according to the purpose of the agitation and the flow state when the electric agitator is agitated. Its advantage is that the use range of the slurry type is divided according to the characteristics of different agitation processes, making the selection Be more specific. Comparing the above table, we can see that the selection basis and results of the electric agitator are relatively consistent. In the following, some of the main processes will be explained.

2. The crystallizing process with electric stirring is very difficult, especially when strict control of the crystal size is required. Generally, small-diameter rapid agitation, such as the turbo type, is suitable for particle crystallization, while the large-diameter electric agitator is actually used and working. Compared with the above, slow agitation, such as the slurry type, can be used for large crystals. crystallization.

3. For the decentralized operation process, the electric agitator is the most suitable because of its high shear force and large circulation capacity, especially the shear force effect of the straight blade turbine is greater than that of the folded and curved leaves. As appropriate. Pusher type and paddle type have less shear force than the straight blade turbine type, so they can only be used when the amount of liquid dispersion is small, and the paddle type is rarely used for dispersion operations. The decentralized operation has baffles to enhance the shearing effect.

4. According to the purpose of the electric stirring process and the flow state caused by the electric mixer, it is a more practical method to judge the suitable slurry type for the process. Because the Soviet Union's choice of pulp type has its own habits, it is not the same as the commonly used pulp type in China.

5. Turbine type has the largest range of solid suspension operation, of which the turbine type is the best. It does not have a disc in the middle, which does not hinder the mixing of the liquid phase above and below the blade, and the advantages of the curved blade to open the turbine are more prominent. Its good discharge and the blade are not easy to wear, so it is more suitable for solid suspension operation. The use range of the propulsion type is narrow, and it is not applicable when the solid-liquid specific gravity difference is large or the solid-liquid ratio is more than 50%. When using the baffle, pay attention to prevent the accumulation of solid particles on the corner of the baffle. Generally, the baffle is used only when the solid-liquid is relatively low, and the hinged turbine and the propeller type have axial flow, so the baffle can also be used.

6. The operating conditions of the electric agitator are more specific, not only the slurry type and stirring purpose of the electric agitator, but also the recommended medium viscosity range of the electric agitator, the stirring speed range of the electric agitator and the capacity range of the tank.

7. The low-viscosity homogeneous liquid mixing of the electric agitator is the least difficult agitation process. It is more difficult only when the volume is large and the mixing time is very short.

The propulsion type is the most suitable because of its strong circulation ability and low power consumption. The turbo type has a high shearing capacity due to its high power consumption, but it is not necessary for this mixing process. Therefore, if it is used for large-volume liquid mixing, its electric stirrer will have insufficient circulation capacity. .

8. The recommended electric mixer of the slurry type is to divide the slurry type into two types: fast type and slow type. The former operates in the turbulent state and the latter operates in the laminar state. When selecting, the slurry type and baffle conditions are determined according to the mixing purpose and flow state of the electric mixer. The determination of the flow state is affected by the viscosity of the stirring medium.

9. The gas absorption process of the electric agitator is most suitable for the disk turbine. Its shear force is strong, and some gas can be stored under the disk to make the gas distribution more stable. When the turbine is turned on, There is no such advantage. The paddle type and propulsion type in the internal stirring system of the electric agitator are basically unsuitable for the gas absorption process, and can only be applied when a small amount of gas absorbed in the electric agitator requires a low degree of dispersion.

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