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Principle of once-through steam generator

Steam generator (boiler) - Wikipedia

The steam, from the steam generator, passes through the turbine, condenser, and is pumped back into the steam generator (SG) as feed water. There are two types of SG: the U-tube SG and the once through SG, as shown in Figures 2 and 3.

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An introduction to steam generation and distribution

Besides pool boiling, vapor is also generated by passing liquid through a tube heated either by firing fuel, as in a once-through boiler, or by condensing steam, as is commonly used in process industries. This method of generating vapor is known as forced-convection boiling. The nature of boiling in forced convection is similar to pool boiling in many ways like the regimes of nucleate or film boiling

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STEAM GENERATORS, NUCLEAR

The once-through steam generator was specifically developed for thermal recovery applications and features a single pass of water through the generator coil and no separating drum. The units are generally designed to produce approximately 80 per cent quality steam, so that the weight ratio of water to steam at the outlet of the generator is about 1:4, which is a much lower ratio than in conventional boiler designs. This water-steam …

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Steam generation fundamentals - EnggCyclopedia

Once Through Steam Generator (OTSG) Without the use of a steam drum, subcooled water also enters the heated tube and gets converted to steam along the flow path (length of tube). The point where water turns into steam depends on the water flow rate (boiler load) and heat input rate.

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Heat recovery steam generator - Wikipedia

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.

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Mathematical Modelling and Design of an Advanced Once-Through Heat Recovery Steam Generator

The once-through heat recovery steam generator design is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of boiler is structurally simpler than a conventional one, since no drum is required. In a

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Design of Once through Boiler | Steam Power Plants | Energy Management

The 800 MW units would be designed on supercritical steam pressure with a drumless boiler on "once through principle". ADVERTISEMENTS: As the steam pressure increases, the differential between the specific weight of saturated water in down-comers and specific weight of steam-water mixture in furnace wall tubes, which causes natural circulation in boiler, goes on decreasing.

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An introduction to steam generation and distribution

steam boilers 17 Coil steam generator (once through boiler) 19 Water-tube boiler 21 MTHS boilers (fire-tube or smoke-tube boilers) 24 Basic overview of boiler controls with reference to EN 12953 25 Water treatment 28 Level controls 29 Feedwater pump

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