By A. Sherry, J. S. Beck, A. E. Cruddace
Sleek energy Station perform, quantity three: Mechanical (Turbines and Auxiliary gear) specializes in the advance of generators and auxiliary gear utilized in strength stations in nice Britain. subject matters lined comprise thermodynamics and steam turbine idea; turbine auxiliary structures equivalent to lubrication platforms, feed water heating platforms, and the condenser and cooling water crops. Miscellaneous station providers, and pipework in strength vegetation also are defined.
This e-book is made from 5 chapters and starts with an outline of thermodynamics and steam turbine concept, paying specific recognition to forms of generators, building of steam turbine cylinders and rotors, and gasoline and hydraulic generators. the subsequent chapters examine turbine auxiliary platforms akin to glands and sealing structures, lubrication structures, governors and governing equipment; feed water heating platforms, feed heater association, and regenerative cycle calculations; and layout and development of condensers. the ultimate bankruptcy is dedicated to miscellaneous station providers and pipework in energy vegetation and discusses water providers, compressed air prone, heating and air flow, and miscellaneous cranes and lifting take on.
This quantity should be of curiosity to strength station engineers.
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Extra info for Mechanical (Turbines and Auxiliary Equipment). Second Revised and Enlarged Edition
Sample text
Spring supports under the condenser ensure that the weight of the condenser is not carried by the turbine casing (see Chapter 4). p. cylinders new condenser arrangements have been adopted in order to provide adequate rigidity of support for the turbine bearings. p. turbines to be supported on two parallel concrete walls. Space has to be allowed beneath the generator for tube withdrawal, and the generator also rests on an extension of these two walls. p. turbine block and the generator. p. turbine support.
Stage of a turbine where it is desired to give a large pressure drop to the first row of nozzles. This is sometimes done to protect the casing and rotor from higher pressure and temperature conditions. As a velocity-compounded stage uses approximately the same heat drop as four impulse stages, it is used to provide a shorter and cheaper turbine, although with some sacrifice in efficiency. It is no longer used in large base-load turbines. 1(a) shows the arrangement of such stage. The nozzles, of the convergentdivergent type, produce a very high steam kinetic energy, some of which is absorbed by the first row of blades, the remainder being deflected back by the stationary guide blades and utilised in the second row.
Nevertheless a very small out-of-balance force always remains. Rotors are normally balanced at low speed (say 400 rev/min) and weight adjustment is made in two convenient planes, one at each end of the rotor. This adjustment may be by varying screwed plugs in tapped holes, or by removing metal from portions of a rim added for this purpose, or by fixing weights in a groove by means of screws. In general subtraction is preferable to addition of weights, since it precludes the possibility of loose weights coming adrift.
