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Factors Affecting The Atomization Capacity Of The Nozzle
Dec 24, 2017

                                   Pressure nozzle

When using pressure atomization nozzle (direct and centrifugal) to carry out spray and dusting, the dust removal efficiency depends mainly on the water supply pressure, and the water pressure of different particle size is different. The more delicate dust needs, the higher the pressure is. The high pressure of water supply can not only get fine particles of water mist, but also make the water particles move faster and larger in space, which is very favorable for dust reduction method based on collision mechanism. According to the requirement of dispersing and dusting efficiency of the actual dust particles, the appropriate water pressure can be achieved by referring to the corresponding graph to achieve the best results and the best economic benefits. This conclusion is suitable for any work place where the atomizing nozzle of the pressure type atomization is used to settle the dust in the coal mine.

Two phase nozzle
For two phase nozzles, the atomizing capacity of the nozzle is affected by the following factors:

(1) the influence of the diameter and length of the mixing tube
The smaller the inner diameter of the mixing tube, it can increase the relative velocity of the gas-liquid two phase, which is beneficial to the atomization, but this will affect the repolymerization of the atomized particles. Because the mixing pipe is too long and the energy loss of gas is also large, it will make the atomization of liquid flow worse. If the mixing pipe is too short, the energy of gas can not be fully utilized, resulting in insufficient atomization of liquid flow.

(2) the effect of the nozzle
The nozzle exit area will increase because reducing pressure drop, resulting in accelerated phase and gas-liquid two is significantly enhanced, and the relative velocity of gas-liquid two phase to liquid phase increases, more fine crushing. However, the increase of outlet pressure will inevitably increase the pressure inside the mixing pipe, resulting in the relative velocity of gas-liquid two phase in the mixing pipe decreases, which will make the atomization worse.

(3) the relationship between the ratio of gas to liquid and the particle size of atomization
With the increase of the gas - liquid ratio, the atomization particle size decreases. Therefore, increasing the relative velocity of gas-liquid two-phase gas-liquid ratio increase, make the film more fine crushing. However, when the gas and liquid ratio increases to a certain extent, the change of particle size is not obvious.

(4) the change of droplet concentration with the ratio of gas to liquid
With the increase of the gas and liquid ratio, the concentration of water decreases, which is caused by the decrease of water mass fraction in the air.




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