By Heinz Bloch;etal
The newest layout and production information in mechanical force steam generators Steam generators indicates how one can pick out, increase, function, and continue fine quality mechanical force steam turbines-with greatest potency and minimal downtime. This new moment version deals authoritative details at the working features, layout positive factors, reliability, and upkeep of all steam generators. an entire sourcebook, Steam generators gives you the services required to capitalize at the most recent steam turbine and intermediate transmission unit innovations--and increase a plant's potency, availability, and profitability. Steam generators, moment version covers: Variable pace drives and intermediate gearing used for significant approach equipment and cogeneration drives-- with thoroughly up-to-date content material association, fabric composition, and simple actual legislation governing layout of steam generators tips to decide upon optimal configurations, controls, and elements suggestions and how you can improve present steam generators
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Extra resources for Steam Turbines: Design, Application, and Re-Rating, Second Edition
Example text
This design provides the greater flexibility in the turbine casing required by machines that must be tolerant to process variations. The extraction valve gear configuration in Fig. 14b is also a poppet valve design with a bar lift mechanism. The chest is a fabricated design that is partitioned to pass flow from each valve to a specified number of nozzles in the extraction diaphragm. The control range for these valves is ±10 percent of the normal pressure at that stage. The major benefit of the internal extraction valve gear is its ability to control the flow from wide open to only a small amount to the condensing section as required to keep that section cool.
Thus, available steam turbine control systems provide a wide variety of system control functions to simplify plant operation and increase plant energy system reliability. 6 Geared and direct-drive types Geared and direct-drive turbine-generator sets are a cost-effective and flexible means of generating power. With today’s competitive economic climate, geared sets, with their lower first cost and competitive efficiency levels, are finding extensive application in the 15,000- to 20,000-kW range. A packaged gear-drive turbine is shown in Fig.
The nozzles preceding the governing stage are usually replaceable although they are often welded in place and not bolted. The governing stage of either a reaction or impulse turbine is designed as an impulse wheel. A stage in a multistage turbine consists of both rotating and stationary blades. The stationary blades can be part of a nozzle ring, Fig. 10, top, or a diaphragm, Fig. 10, bottom. In either case their function is to direct steam onto the rotating blades, turning the rotor, and producing mechanical work.