Waste heat boilers for London Hospital
King’s College Hospital NHS Foundation Trust, London’s major teaching hospital, has invested in three new highly efficient steam boilers manufactured in Yorkshire by
Byworth Boilers, the UK leading independent producers of industrial steam and hot
water boilers.
The hospital, in developing its new Combined Heat and Power (CHP) installation, has replaced five 40-year-old boilers with three Yorkshireman packaged steam, three pass boilers. The emphasis of the whole project focuses on energy efficiency and low carbon emissions.
Two of the boilers are a combination of a fired boiler with a waste heat recovery boiler, utilizing heat from the CHP engine exhaust gases topping up the 10,000 Kg/hr of steam produced by the fired side. These two boilers were specifically designed for this application by Byworth’s Chief Design Engineer John Fox, and are just two of an ever-increasing number of waste heat and combination boilers being manufactured by Byworth Boilers.
The third, slightly larger 11,250 Kg/hr Yorkshireman boiler commissioned by the hospital is a standard fired Yorkshireman boiler with dual fuel burner.
In order to maximise energy efficiency, all three boilers are fitted with flue gas economisers which extract heat from the flue gases to pre-heat the feed water. The combination boilers in fact each have two integral economisers, one specially configured for the waste heat section and one for the fired section.
The contract to provide the hospital with the new energy centre was awarded to Dalkia plc, providers of Technical Facilities Services and Energy Management. Phil Barnes, Dalkia’s Operations Manager said: “Having carefully assessed all the energy requirements at King’s College Hospital it was clear the efficiency and flexibility of the Yorkshireman boiler range were ideal. We have worked closely with Byworth’s technical staff to ensure maximum efficiency and we’re confident the running costs alone of the new boilers will lead to massive savings for the hospital. There is also no doubt the specialist knowledge and experience of Byworth’s in-house design team in creating these bespoke boilers was absolutely vital to the success of this project.”
Another element of the contract that proved particularly difficult was the actual offloading and positioning of the boilers. The boilers had to be positioned at first floor level, in a very tight space, so each of the large boilers had to be lowered in by crane on to a specially made steel frame, which was then slowly ‘skated’ into position. The installation was carried out by Donland Engineering, Staines.