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Vertical steam boiler with high efficiencies and ultra-low NOx emissions

05 February 2018

The all-new gas-fired, vertical spiral-rib tubeless steam boiler from Fulton – the VSRT – is the first product in the company’s ‘PURE Technology’ approach, an initiative that has resulted in a design that has high efficiencies and ultra-low NOx emissions as standard. 

Fulton’s VSRT challenges the heat transfer and mechanical design principles of traditional steam boilers. Leigh Bryan, sales and marketing manager for Fulton, said: “To meet ever-more stringent industry and environmental standards, our PURE Technology approach looks to enhance heat transfer, provide class-leading efficiencies, improve steam quality and reduce NOx emissions. Rather than improve existing products to achieve these goals, PURE Technology challenges conventional boiler design by engineering solutions that are fit-for-purpose and applications.”

A unique spiral design achieves low stack temperatures by passing the flue gases through a spiral-wound heat exchanger that is fully immersed in water. In addition to improving boiler efficiency this design also offers durability. It features a fully water-backed pressure vessel, which is wrapped in insulation to achieve minimal thermal losses and low outer surface temperatures. The tubeless design has also enabled Fulton to create a compact boiler with minimal footprint. No refractory also means significantly lower weight (compared to traditional vertical steam boilers) for ease of installation. ? ?

Ultra-low NOx emissions of less than 20ppm are achieved due to the VSRT’s combustion technology, which features a modulating burner and furnace that have been designed as a single component and fully-matched with the VSRT. This has helped achieve up to 10:1 turndown capabilities and performance of >82.5% gross thermal efficiency and 99.75% steam quality at 8 bar. When correctly sized for applications, the high turndown will result in savings above and beyond those gained from the stated efficiencies.

The VSRT is currently available with outputs from 160 to 960 kg/h, complies with the City of London Air Quality Strategy and anticipated MCPD regulations, is constructed to BS EN 12953 and CE marked to PED. Its pressure vessel and burner are backed by a five-year guarantee as standard.

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