Misting systems for dust reduction
We are engaged in studies and consulting focused on technologies for reducing dust using a high-pressure misting system. The purpose of “Misting” is to reduce dust during transport and storage of fuel (eg. coal or biomass) and other bulk materials. The use of high-pressure misting systems is usually designed in belt conveyors where industrial extraction is not possible for economic or technical reasons.
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The misting sites, which are mostly closed overflows, can be equipped with high-pressure special nozzles that spray water into a fine nebula. This binds the whirling dust to itself and sits back into the transported material. The water pressure used for fogging purposes is approx. 20 - 40 bar. This pressure is sufficient for the atomization of water droplets - the development of nebulae, using special nozzles. No chemical additives are added to the water in the high-pressure system and no waste is generated during operation. A small or almost no amount of water is added to the transported fuel - this does not increase the proportion of moisture in the transported material. The high-pressure misting unit is usually connected to the distribution of filtered, chlorine-treated water. From the pressure unit, the main distribution of pressurized water is led to the individual solenoid boxes (SB) by a pipe made of stainless material. From the solenoid boxes, pressurized water will be led to the individual misting points via precision stainless steel pipes. Pipelines are usually underheated in non-tempered parts and insulated for operation during the winter months. The limit for operation is approx. -15 °C, during this extreme frost the water is drained from the pipes and the pipes, must be blown through with air. Underheating will remain in operation. The nozzles located on the overflows are connected to the high-pressure distribution using hoses, shut-off ball valves and will be attached to the holders. It is also possible to use high-pressure misting devices to suppress airborne dust. These cannons are usually installed in landfills for bulk and dusty materials or in places of large overflows of materials. Fog guns atomize water using installed nozzles into small droplets of size (7 - 15 μm) with relatively low water consumption and pressure up to 40 bar. Misting cannons can be installed with great advantage on various dump, pick-up and dredging machines.