By Heinz P. Bloch
The newest layout and production info in mechanical force steam turbines
Steam Turbines indicates the best way to opt for, increase, function, and continue high quality mechanical force steam turbines-with greatest potency and minimal downtime. This new moment variation bargains authoritative info at the working features, layout beneficial properties, reliability, and upkeep of all steam generators. an entire sourcebook, Steam Turbines provides the services required to capitalize at the most modern steam turbine and intermediate transmission unit innovations--and enhance a plant's potency, availability, and profitability.
Steam generators, moment Edition covers:
- Variable velocity drives and intermediate gearing used for significant procedure equipment and cogeneration drives-- with thoroughly up-to-date content
- association, fabric composition, and simple actual legislation governing layout of steam turbines
- the best way to decide upon optimal configurations, controls, and components
- thoughts and how one can improve current steam turbines
Read Online or Download Steam Turbines Design Application and Re-Rating PDF
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Extra resources for Steam Turbines Design Application and Re-Rating
Example text
Its size permits mounting both the turbine and its combined lube/hydraulic system on a common base. The turbine base has been set in the photograph, while the base-mounted generator is being lowered into place. Installation of the modules in the field consists of mounting each module on its foundation, shimming and grouting the turbine-generator bases, connecting the couplings, checking the final alignment, and flushing the oil system. Once the electrical connections are complete and the steam, service water, and other miscellaneous connections are made, the package is ready to produce power or to impart energy to fluid streams.
This double-shell design limits the steam pressure and temperature to which the outer casing is exposed. 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.
15c represents a single automatic extraction unit. The speed governor responds to speed/load changes. The pressure governor regulates extraction pressure as process needs change. Simply changing the position of the extraction valve at a constant inlet valve position would also change the speed/load as well. Therefore, the two systems interact to maintain constant load. For example, a reduction in process steam requirements leads to an extraction reduction and an extraction pressure rise. The pressure governor opens the extraction valve, increasing low-pressure section flow and power.
