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Introduction of Atomizing Nozzle

(Summary description)According to the spray shape formed by the nozzles, the nozzles can be divided into cone-shaped solid nozzles and cone-shaped hollow nozzles. The solid nozzle is mainly used for dust suppression, and the hollow nozzle is mainly used for dust suppression.

Introduction of Atomizing Nozzle

(Summary description)According to the spray shape formed by the nozzles, the nozzles can be divided into cone-shaped solid nozzles and cone-shaped hollow nozzles. The solid nozzle is mainly used for dust suppression, and the hollow nozzle is mainly used for dust suppression.

Classified by fog flow shape

According to the spray shape formed by the nozzles, the nozzles can be divided into cone-shaped solid nozzles and cone-shaped hollow nozzles. The solid nozzle is mainly used for dust suppression, and the hollow nozzle is mainly used for dust suppression.

The cone-shaped solid mist column sprayed by the solid nozzle has a higher mist flow velocity, and the dust collided by the mist particles can generally fall down. However, because of the high velocity of the fog flow, the air drawn around it can easily blow away the respirable dust with a small particle size, which objectively affects the dust reduction effect. The cone-shaped fog screen sprayed by the hollow nozzle is mainly dust-blocking. In order to increase the area covered by the fog screen, there is generally a large cone angle of the fog screen, and the nozzle is relatively far away from the dust source. This also causes the fog particle velocity to be reduced to a very low level at the end of the fog screen with a larger diameter. In addition to not being able to capture dust particles, it also loses its dust-blocking effect.

From the analysis of the shape of the fog body, the density of the solid spray fog body is higher than the density of the hollow spray fog body in its full length area. In the effective range of the solid spray, it is generally difficult for coal dust to pass through the fog screen, so , The solid cone-shaped fog body is better than the hollow cone-shaped fog body.

Classified by atomization method

(1) Mechanical atomization

Mechanical atomization is mainly based on the high-speed jet produced by the liquid under the action of pressure difference to atomize itself, so the nozzles can be divided into direct nozzles, centrifugal nozzles and rotary nozzles. Direct atomization and centrifugal atomization can be collectively referred to as pressure atomization.

Direct jet nozzles mainly rely on water jets to achieve the purpose of atomization. The water pressure requirements are relatively high, and the larger the diameter of the nozzle hole, the thicker the atomization, so the diameter of the nozzle hole cannot be too large, and the flow rate adjustment range is relatively small. The centrifugal nozzle uses the centrifugal force generated by the high-pressure water through the swirl device to produce a liquid film, which is broken and atomized by the air. The effect of centrifugal atomization is better than direct atomization, but it also requires higher water supply pressure, so the application conditions are limited.

Rotary nozzles are roughly divided into two categories: rotating body type and rotating nozzle type. The rotating body type is divided into the rotating cup type and the rotating disc type. Rotary cup atomization is to spray water into the front end of a cone-shaped rotor, and use the high-speed rotating rotor to spread the water into a thin film. The liquid is atomized by the combined action of "centrifugal force spray" and "speed spray". In the same way, rotary-disk atomization relies on a high-speed rotating disk to atomize liquid.

(2) Medium atomization

According to the different atomization methods, it is divided into pneumatic atomization and bubble atomization. Pneumatic atomization nozzles are widely used, as shown in Figure 1. Pneumatic atomization nozzles rely on a certain pressure of gas (compressed air or steam) to form a high-speed airflow, which makes the air and water form a high relative velocity to achieve the purpose of atomization. The advantage is that a good atomization effect can be obtained under lower water pressure, and the working conditions can be adjusted in a larger range. But the power source is not single, and the system composition is complicated.

Special nozzles generally adopt the principles of ultrasonic, electromagnetic field, electrostatic effect and other principles for atomization. Although this type of nozzle has a good effect in some other industrial applications, it is rarely used due to the harsh underground environment of coal mines.

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