Experimental Studies on the Spraying Pattern of a Swirl Nozzle for Coal Dust Control

Guijun Gao,Changjiang Wang,Ziming Kou

doi:10.3390/app8101770

Guijun Gao, Changjiang Wang + Show 1 more

Open Access

https://doi.org/10.3390/app8101770

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Abstract

The experimental and numerical studies were performed to understand the atomization mechanism of pressure spray of a swirl nozzle. The design and performance parameters such as spray cone angle, velocity of particles, spray pressure, and Sauter Mean Diameter (SMD) of the droplets were studied using a laser particle size analyzer and high-speed camera. The results show that the SMD increases at first, then decreases as the spray distance increases, and finally tends to be stable after 1 m. The SMD is largest in the center of the spray field and decreases gradually along the radial direction. The SMD distribution is more concentrated near the nozzle. Increasing spray pressure and deceasing nozzle diameter both can make the SMD distribution more concentrated and uniform. The swirl nozzle has been used in a coal mine and was shown to be very effective in suppressing coal dust compared to other traditional nozzles.

Highlights

Coal dust of the mining industry causes the number one health problem in coal miners: pneumoconiosis
Water spraying is one of the most efficient and cost-effective measures to reduce dust concentration in coal mines [3]. This method uses small water particles sprayed by a nozzle to capture the coal dust in the air
The method to produce tiny water particles and the diameter of the water particles are important for reducing coal dust

Summary

Introduction

Coal dust of the mining industry causes the number one health problem in coal miners: pneumoconiosis (black lung). Excessive coal dust in underground coal mines can cause disastrous explosions [1,2]. Water spraying is one of the most efficient and cost-effective measures to reduce dust concentration in coal mines [3]. This method uses small water particles sprayed by a nozzle to capture the coal dust in the air. The method to produce tiny water particles and the diameter of the water particles are important for reducing coal dust. Pang Jiewen et al [5]

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Discussion

Conclusion