Steam boiler Prism

hot waterheat-recovery

Thermal energy captured in waste-to-energy (WTE) facilities can be beneficially used to provide district heating for households and businesses as well as process heating for industrial heat consumers. Keppel Seghers' energy recovery systems and process equipment are designed to maximise WTE efficiency with prolonged lifespan. Keppel Seghers Boiler A key component in the energy recovery system, the Keppel Seghers Boiler transfers heat present in the flue gas to the water/steam circuit. It consists of two sections which optimise heat recovery efficiency while minimising thermal corrosion: - Radiation section (also known as empty passes) - Heat transfer by radiation in the high temperature range (1200 - 650°C) - Water-cooled walls with no tubes installed in the flue gas flow - Convection section - Heat transfer by convection in the lower temperature range (650 - 200°C). - Water-cooled walls with tubes hung in the flue gas flow. The tubes are arranged into different blocs, each with its own function. The segregation of the two sections mitigates the corrosive impact of the flue gases. In the convection section the boiler tubes are directly into contact with the flue gases. The combination of some pollutants and the temperature results in a high risk for corrosion of the boiler tubes. Therefore the flue gas temperature is reduced to about 650°C in the radiation section before coming into contact with the tubes of the convection section.