What are the ways to improve nozzle atomization

Time:

2022-11-23 14:39

According to the atomization mechanism and experimental research, and in combination with the on-site use experience in coal mines, the main ways to improve the atomization of nozzles are as follows

(1) The relative velocity difference between gas and liquid phases is increased to increase the aerodynamic force, so that the droplets are broken more finely under the action of atmospheric force.

(2) Increase the outlet velocity of the liquid phase nozzle to enhance the collision, so that the relatively ejected droplets can be further broken in the collision. It is found that if the outlet velocity of the droplets is small, they will converge into large droplets. If the outlet velocity of the droplets is large, the degree of atomization can be improved. However, this will reduce the relative velocity of gas and liquid, and make the aerodynamic atomization droplets worse.

(3) The experimental results show that the geometry and size of the nozzle and mixing tube have a great influence on the atomization performance. Therefore, in the design of the model, in addition to their respective effects on the atomization, the overall performance changes after they are combined should also be considered.

(4) Study the relationship between the flow rate and pressure of the spray water supply system and the geometric size and structural shape of the nozzle to improve the atomization effect. In particular, the water pressure of the water supply system has a greater impact on the atomization effect. The higher the water pressure, the finer the water mist particles. However, the problems caused by high water pressure are: ① large energy consumption; ② All parts in the water supply system are subject to high pressure, easy to fail, and short life, especially the internal spray system on the mining equipment. This puts forward another research topic for us: how to improve the structure of pressure atomizing nozzle to obtain fine water mist particles under limited water supply pressure.