2011/2/2 · ONCE-THROUGH BOILERS. These boilers, in contrast to recirculation or natural circulation units, are characterized by continuous flow paths from the evaporator inlet to the superheater outlet without a separation drum in the circuit. They are almost exclusively used for steam production in connection with utility electricity generation, and have
The once-through generator was specifically developed for thermal flooding applications and provides features not available in conventional steam boilers. Among the important advantages are the following:1. It will handle feedwater with a relatively high percentage of solids, provided the solids have been converted to soluble form.2.
About OTSG. Once Through Heat Recovery Steam Generators (OTSGs) are the most significant advancement in steam generation in over a century. Until the 1980s, conventional drum boilers were used to produce steam. At about this time, the US Navy investigated the use of combined gas turbine and steam turbine plants for additional ship propulsion power.
The steam temperature drops as the steam flow rate to the SH increases. Since the drum boiler has a large heat capacity and a slow pressure fluctuation as compared with the once-through boiler, changes in the generator output and main steam flow are large
in a once-through boiler, or by condensing steam, as is commonly used in process industries. This method of generating economizer, water-wall, superheaters/ reheaters, etc., are located in the steam generator in the flow path of products of heat