In fact, the atomization effect of atomizing nozzle is related to many aspects, and different forms of atomizing nozzle affect him differently, such as:
1. Pressure atomizer
When using pressure atomizing nozzle (direct and centrifugal) to carry out spray dustfall, the dust removal efficiency depends mainly on the water supply pressure, and the water pressure of different particle sizes is different for the definite use occasions. The higher the pressure of the finer dust is, the higher the pressure is. The high water supply pressure can not only obtain the fine water mist of particles, but also make the water mist particles have high movement speed and large space water content, which is very beneficial to the dust reduction method based on collision mechanism. According to the actual dust particle dispersion and dust reduction efficiency requirements, referring to the corresponding curve to select the appropriate water pressure can achieve good results and the best economic benefits. The conclusion is applicable to any workplace where pressure atomizing spray nozzle is used to spray and settle coal dust.
2. Two phase atomizer
① Influence of mixing tube diameter and length: the smaller inner diameter of mixing tube can increase the relative velocity of gas-liquid two phases, which is conducive to atomization, but it will affect the re aggregation of atomized particles. Because the mixing tube is too long and the gas energy loss is too much, the atomization of liquid flow will become worse; If the mixing tube is too short, the gas energy can not be fully utilized, resulting in insufficient atomization of liquid flow.
② Effect of nozzle: because reducing the outlet area will increase the outlet pressure drop, the acceleration of gas-liquid mixture is significantly enhanced, and the relative velocity of gas-liquid phase increases, which also makes the liquid phase break finer. However, the increase of outlet pressure drop will inevitably increase the pressure in the mixing pipe, resulting in the decrease of the relative velocity of gas-liquid two phases in the mixing pipe, which will make the atomization worse.
③ Relationship between gas-liquid ratio and atomized particle size: with the increase of gas-liquid ratio, the atomized particle size decreases. Therefore, increasing the gas-liquid ratio can increase the relative velocity of gas-liquid two phases and make the liquid film break finer. 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: with the increase of gas-liquid ratio, the particle concentration of water decreases, which is caused by the decrease of water mass fraction in air
