High & Low Pressure Boiler Applications
Our Power Solutions division can draw upon years of experience of working with a wide variety of different types of boilers with both high and low pressure capabilities. Boiler types include land based coal, gas and energy from waste applications with the addition of main and auxiliary type marine boilers used onboard merchant vessels and offshore. Our team has fostered years of close working relations with manufactures meaning we have full knowledge and ability to work with their systems giving great flexibility to clients who may operate a range of boilers from different manufactures.
Our portfolio of boiler maintenance services includes:
Marine boilers are designed to be compact, with high efficiency and reliability.
Main boilers produce superheated steam at high pressure suitable for use within turbines – typically 60barg and 515DegC. Today, main boilers are most commonly found on LNG carriers where the boil off gas from the cargo is used as the primary fuel.
The ‘D’ type main boiler is the most prevalent type.
In brief, this construction has two drums, one water and one steam, with fully flooded water walls enveloping the furnace space, the tubes are welded together to form a gas tight space – it is this overall shape that gives there boilers a ‘D’ shape. Between the drums the main generating bank of tubes are installed and in the space between the generating bank and furnace, the superheater is installed with a screen wall of flooded tubes at the junction with the furnace. Large bore tubes, called downcomers are installed between the drums and headers to ensure proper natural circulation of the water. In the roof of the furnace burners are installed in a down fired configuration, where the flame path from the water-cooled furnace is through the screen tubes, the superheater assembly and the main generating bank, then finally through an economiser used to pre-heat the boiler feedwater, and finally through an air heater to preheat the combustion air fed to the burners and then to atmosphere at the funnel top. A typical arrangement can be seen in the following image.