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Widnes, Cheshire, United Kingdom, 07/31/2008 – Delavan’s sector specialist, Andy Nixon explained, “Client spray nozzle requirements vary greatly depending on their plant set-up and environmental objectives. Nozzles for gas cooling, for example, need to deliver liquid in volumes proportional to flue gas flow, with even distribution and small droplet size. This ensures complete evaporation of the droplets for maximum cooling, but without residual excess fluid use or wetting that could harm the plant.”
Swirl Air two-fluid nozzles from Delavan ensure user processes can comply with stringent environmental standards, yield higher product quality and maintain process continuity to increase plant productivity. Swirl Air nozzles provide flow rates from one to 2,400 gallons per hour and spray angles from 50 to 100 degrees with precise control of droplet size.
Swirl Air nozzles provide the adaptability to meet variable process needs. There is a correlation between exhaust volume and temperature and the nozzles have the capability for flow adjustment so that output can be fine tuned to meet the prevailing requirement.
Applications arise in incinerators, cement production, metal production and other industries where there is a need for flue gas cooling or gas conditioning to remove harmful gasses or particles. Delavan engineers work closely with end users and the manufacturers of environmental control systems to select nozzles that optimise flow, distribution and droplet size to meet the environmental objective.
Swirl Air nozzles require just two inputs, the spray liquid and the propellant gas. This propellant is usually compressed air but could be an alternative gas or steam depending on the process or availability. As a nozzle specialist, rather than a provider of standardised off-the-shelf turnkey systems, Delavan are able to take into account fully, the client’s air and liquid delivery systems and recommend nozzles to optimise system performance.
Operational needs are important. Nozzles will therefore be selected that offer extended service life and minimise maintenance downtime. Compressed air is introduced tangentially into the spray chamber to swirl round at high velocity. Primary atomisation is achieved as the liquid passes through the swirling air. This stream then passes through a precisely engineered structure, comprising the orifice and pintle plate. The change in pressure and stream direction causes secondary atomisation and creates the precise distribution pattern and droplet size required. Compared to pressure driven nozzles, Swirl Air nozzles achieve comparable levels of atomisation at much lower pressures.
Delavan has invested heavily in tooling to ensure nozzles are manufactured to precise tolerances and with exceptional levels of surface finish. Nozzle bodies and caps are usually made in long-life 316L and 440 Stainless Steel. Various grades of Hastelloy, Titanium and Inconel are available for applications with high temperatures or acidity. Critical wear components can be easily changed without dismantling the nozzle. For extreme conditions with aggressive particulates, carbide lined nozzles are available. Engineered accessories include lances to ensure perfect nozzle position. These may be heated, cooled or insulated where this is necessary.
Delavan’s catalogue of over 30,000 pre-engineered nozzles and components are ideal for cleaning, coating, misting, dosing, or aeration as well as environmental control. Technical service is available via Delavan or authorised representatives throughout the world.
Michelle Rogers, F: +44 (0) 151 495 1043 E: michelle.rogers[.]goodrich.com.
Delavan Spray Technologies, Gorsey Lane, Widnes, Cheshire, WA8 0RJ, UK
Delavan is a company within the Goodrich Corporation. Trade names are protected and defended in all countries where the company operates.
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sales[.]delavan.co.uk 
