In the mining process before coal washing, on the one hand, due to the needs of mining technology, the moisture of raw coal will be naturally evaporated; On the other hand, in order to improve the quality of coal, the external moisture on the surface of raw coal needs to be further controlled. When combined, the moisture content of raw coal will significantly decrease.

At the coal washing stage, on the one hand, due to the complex logistics process of the washing process, some fine particles on the surface of the raw coal cannot successfully adhere to coarse or rectangular particles, thus falling off and separating to form coal dust; On the other hand, coupled with the open and exposed space of the raw coal flow, the coal flow is affected by the gravity height difference, irregular flow direction, and flow speed of the flow. Some fine particles will gradually detach from the coal flow and scatter, forming coal dust.

High pressure spray dust suppression equipment technology is a system technology of source dust suppression. Its main working principle is to use the force of water supply system, gas supply system and high pressure micro fog system to transform the original liquid water into atomized water particles in the form of high pressure micro fog, so that under the effect of increasing the surface area of contact with dust particles and reducing its own surface tension, high-speed collision and adsorption with dust particles will occur, resulting in efficient sedimentation reaction.

The high-pressure micro mist dust reduction system uses a high-pressure system to pressurize water, and then collides with an atomizing needle at a speed of 90 meters per second to split the water into 1-5 micron water mist particles that are sprayed into the air. On the one hand, the direct descent of these particles is close to that of haze (PM2.5) and dust particles with a diameter of less than 10 microns that can be adsorbed. Therefore, they have a strong ability to adsorb and condense dust, which can quickly cause it to settle. On the other hand, water mist particles are small and white in color, and when they encounter air, they will evaporate and vaporize. When people and vehicles pass through them, they will feel cool instead of feeling drenched in rain.

Use environmental spray dust suppression equipment in cities, and use mobile apps for remote monitoring, management, and protection to achieve unmanned dust suppression and haze removal. In addition to dust suppression and haze removal, urban use can also adsorb exhaust particles emitted by cars, which has an effect on improving the environmental quality of urban air.