INTEGRATED WATER SERPENTINE ECONOMIZER AND AIR HEATER ARRANGEMENT AND METHOD FOR IMPROVING THE AVERAGE RECORDING TEMPERATURE DIFFERENCE FOR A BOILER ECONOMIZER

摘要

integrated water coil air heater and economizer. an integrated water coil air heater and economizer arrangement for a boiler has a feed water inlet to supply feed water to the boiler, and ducts and a valve to divide the inlet feed water into a first stream lower mass flow, partial lower temperature, and a second upper flow current, partial higher temperature. a water coil air heater for passage of air to be heated to the boiler contains at least one heat transfer circuit in relation to heat transfer with air, the heat transfer circuit of the coil air heater of air being connected to receive the first partial current. an economizer for flue gas passage to be cooled to the boiler contains at least one heat transfer circuit in relation to heat transfer with the flue gas, the economizer heat transfer circuit being connected to the heat transfer circuit heat from the water coil air heater to receive the first partial current from the water coil air heater. a mixing site downstream of the economizer receives and gathers the first and second partial streams and a conduit carries the second partial stream from the feed water inlet to the mixing site.