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Influencing factors between atomizing nozzles

(Summary description)When using pressure atomizing nozzles (direct and centrifugal) to implement spray dust reduction, for certain use occasions, the dust reduction efficiency mainly depends on the water supply pressure. Different particle sizes of dust require different water pressures,

Influencing factors between atomizing nozzles

(Summary description)When using pressure atomizing nozzles (direct and centrifugal) to implement spray dust reduction, for certain use occasions, the dust reduction efficiency mainly depends on the water supply pressure. Different particle sizes of dust require different water pressures,

Pressure nozzle

When using pressure atomizing nozzles (direct and centrifugal) to implement spray dust reduction, for certain use occasions, the dust reduction efficiency mainly depends on the water supply pressure. Different particle sizes of dust require different water pressures, and the finer dust requires pressure Higher. The high water supply pressure can not only obtain fine water mist, but also make the water mist particles move at a high speed and have a large water content in the space. This is extremely beneficial for dust reduction methods based on collision mechanisms. According to the actual dust particle dispersion and dust reduction efficiency requirements, referring to the corresponding graph to select the appropriate water pressure can achieve good results and the best economic benefits. This conclusion is applicable to any workplace where pressure atomizing nozzles are used to spray and settle coal mine dust.

Two-phase nozzle

For two-phase nozzles, its atomization ability 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 can increase the relative velocity of the gas-liquid two-phase, which is beneficial to atomization, but it will affect the re-agglomeration of atomized particles. Because the mixing tube is too long and the gas energy is lost, it will make the liquid flow atomization worse; if the mixing tube is too short, the gas energy cannot be fully utilized, resulting in insufficient liquid flow atomization.

(2) The influence of the nozzle

Because reducing the nozzle outlet area will increase the outlet pressure drop, the acceleration of the gas-liquid mixture is obviously enhanced, and the relative velocity between the gas-liquid phases increases, which also promotes the liquid phase to be broken into finer particles. However, the increase in outlet pressure drop will inevitably increase the pressure in the mixing tube, which will result in a decrease in the relative velocity of the gas-liquid two-phase in the mixing tube, which will make the atomization worse.

(3) The relationship between gas-liquid ratio and atomized particle size

With the increase of the gas-liquid ratio, the atomized particle size tends to decrease. Therefore, increasing the gas-liquid ratio can increase the relative velocity of the gas-liquid two-phase and make the liquid film more finely broken. However, when the gas-liquid ratio increases to a certain extent, the change of particle size is not obvious.

(4) Change of droplet concentration with gas-liquid ratio

As the gas-liquid ratio increases, the particle concentration of water shows a decreasing trend, which is caused by the decrease of the mass fraction of water in the air.

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