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Articles from SCREENING PLANT & EQUIPMENT (610 Articles), RECYCLING (234 Articles), DUST CONTROL SYSTEMS (87 Articles)

Midget nozzles suppress dust, save water

A leading supplier in dust suppression technology has introduced a new nozzle design for its atomised misting equipment, engineered specifically for applications requiring smaller droplet sizes or reduced water volumes to minimise surface wetting.
The new Midget nozzles from Dust Control Technology are well suited to mining, transfer stations and recycling, in which the water volumes from standard nozzle configurations could be undesirable. Users report benefits such as improved worker safety and comfort, reduced moisture in end products, and enhanced odour control.

“Some dust management applications are sensitive to excess water,” explained technical sales specialist Carl Harr. “It could be that there are people and/or machinery working continuously in the immediate vicinity, or because the end product could be damaged by too much moisture. The Midget nozzles give us an option that can still deliver very good particle control, while reducing the total water applied by about 65 per cent.”

Carl used the example of the company’s smallest fan-driven atomiser, the Dust Boss DB-30, which has a flow rate of 9.6 litres per minute at 60 psi (4.14 bar), with a standard nozzle configuration. When equipped with the new Midget nozzles, the unit cuts that flow to just three quarts per minute.

“The Midgets deliver a consistently smaller droplet size, which can be an advantage with very fine particulates,” said Carl. “While the overall size range is still 50 to 200 microns, the water is atomised to a consistently smaller droplet, producing greater numbers in the lower size range.

“Since the best chance to create a collision between water droplets and dust particles occurs when they are roughly the same size, the smaller droplets are effective on fine dust.

“The smaller size also means that the dust-trapping droplets are lighter in weight, so they hang in the air longer, giving them greater exposure time to airborne particles.”

In a typical application for the Midget nozzles, a customer ordered a DB-30 and mounted it in an elevated location at a mining site. The dust suppression was very effective, but after running the machine, the customer found that walkways and handrails were wet, creating the potential for a fall hazard. With crushers operating below, the consequences could have been disastrous.

When Carl visited the site, he brought a set of the new Midget nozzles along. “As soon as they were installed, the customer stopped talking about returning the machine,” he recalled. “There is a performance trade-off in overall suppression because with smaller droplets it can take more than one collision with a particle before it’s heavy enough to fall to the ground. But in many applications, the suppression performance is adequate, and any compromise is outweighed by the benefit of reduced water being applied.”

The new line of Midget nozzles is an extension of DCT’s commitment to custom tailoring dust management solutions to fit specific applications. Unlike dust suppression equipment OEMs who offer a limited selection of nozzle sizes, manifolds and configurations, DCT engineers can mix and match sizes, spray patterns, misting rings and other components to most efficiently address the individual service environment.

“No two dust management applications are the same,” Carl Harr concluded. “One size truly does not fit all.”

Midget nozzles from DCT are made from solid brass construction with an 80º spray angle, sized for a standard one-eighth inch NPT pipe connection.

Source: Dust Control Technology

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Tuesday, 23 October, 2018 08:46pm
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