By Tadashi Tanuma
Advances in Steam generators for contemporary strength Plants presents an authoritative overview of steam turbine layout optimization, research and size, the improvement of steam turbine blades, and different serious elements, together with turbine retrofitting and steam generators for renewable strength plants.
As a really huge share of the world’s electrical energy is at the moment generated in platforms pushed via steam generators, (and will probably stay the case sooner or later) with steam generators working in fossil-fuel, cogeneration, mixed cycle, built-in gasification mixed cycle, geothermal, sun thermal, and nuclear crops internationally, this ebook presents a finished overview of the examine and paintings that has been accomplished over the last decades.
- Presents an in-depth evaluation on steam turbine layout optimization, research, and measurement
- Written by way of more than a few specialists within the area
- Provides an outline of turbine retrofitting and complex purposes in strength generation
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Additional info for Advances in steam turbines for modern power plants
Fig. 7 also shows thermal efficiency improvement due to lower exhaust pressure. Because the exhaust steam of the condensing turbine is wet saturated, the exhaust pressure depends upon the cooling temperature of the condenser. In fact, the exhaust pressure is decided by taking the following items into consideration. ● ● ● Condenser cooling water temperature and equipment cost of condenser, circulating water pipes, related pumps, and others. Wetness fraction of the last stage of the LP turbine. Steam volume flow and LP last-stage blade length.
When there is an imbalance between process steam demand and electricity demand, the back pressure turbine cannot respond to this imbalance by itself, and this imbalance is adjusted by power supply increase or decrease from the network or by reduced pressure and temperature steam from the HP steam source. Saved heat (E) by the back pressure turbine is shown in the following formula if the total heat of the steam is used effectively. 14) where G: steam flow (kg/h), ηi : internal efficiency of back pressure turbine, ηit: internal efficiency of condensing turbine, Ht: adiabatic heat drop of back pressure turbine (kJ/kg), 0 Ht : adiabatic heat drop of condensing turbine (kJ/kg), hc: potential heat of steam in condenser (kJ/kg), Saved heat E is shown in Fig.
6 . The HP and IP turbines are combined in one casing. The cooling structure has been studied for the VHP, HP, and IP turbines. In the figure, two cooling piping lines are found at the VHP turbine and between the HP and IP turbines. In addition to the USC experience of cooling steam path that is grooved 48 Advances in Steam Turbines for Modern Power Plants under the serration of the blade fixations, cooling design for the welded joints on the rotor is applied to the VHP, HP, and IP turbines.