Research and application of dust reduction technology for supersonic spiral an atomizers

Abstract

To solve the problem of dust pollution, a new type of ultrafine spiral atomization nozzle with a small droplet size and strong dust reduction ability was developed according to the principle of air-water spray and the generation law of vortex airflow. Numerical simulation software is used to simulate the velocity and streamline distribution of the air flow field inside the air flow director under different parameters, and the best spiral effect parameters of the air flow director for the directional air flow are obtained. Set up an experimental platform to determine the performance parameters of the ultrafine spiral atomization nozzle and compare the dust suppression performance of the ultrasonic dry mist to study its dust suppression performance. The results show that when the angle between the spiral trough and the tapered wall is α = 30° and the ratio of the diameter of the top surface of the air flow director to the height d = 1.25, the air flow director has the best directional air flow spiral effect. When the air supply pressure of the supersonic nozzle and spiral groove is 0.4 MPa, the atomization angle of the supersonic spiral atomizer is the largest, the D90 of the droplet group is 19.7 μm, and the comprehensive atomization performance is the best. At this time, the total dust reduction efficiency is 92.18%, which is better than the ultrasonic dry mist for dust suppression and dust reduction. The efficiency is 81.97%. When the full-section spiral pneumatic dust control system with an ultrafine spiral atomization nozzle as the core is applied to the 06 return airway of the Mindong No. 1 Mine, the dust reduction efficiency of the respirable dust is 88.8% ~ 91.58%.