boiler effects on steam turbine response

boiler effects on steam turbine response

  • Carryover of impurities with steam is a major concern in boilers having superheaters and also if steam is used in a steam turbine. Impurities in steam lead to both corrosion and deposit formation

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  • 2.3 Effects of dissolved solids and gases. To minimize corrosion, erosion, and scaling in the boiler pressure parts and the steam turbine, it is important to keep dissolved solids and dissolved gases in the steam to a minimum. In a subcritical plant, dissolved solids are controlled via the boiler drum blowdown.

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  • Steam Pressure Reduction: Opportunities and Issues varies directly in proportion to the boiler’s net stack temperature (the difference between the flue gas tem-perature and combustion air temperature). When boiler pressure is lowered, a lower stack temperature results. This, in turn, causes slightly improved combustion efficiency.

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  • A typical governor model for steam turbines has two main sections, the governor and steam control valve, whose output is effective control valve area in response to speed deviation of the machine, and a section modelling the turbine, whose input is steam flow and output is mechanical power applied to the rotor (Fig. 1) [4,5,7,9,11].

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  • The Rankine cycle is a model used to predict the performance of steam turbine systems. It was also used to study the performance of reciprocating steam engines. The Rankine cycle is an idealized thermodynamic cycle of a heat engine that converts heat into mechanical work while undergoing phase change. It is an idealized cycle in which friction losses in each of the four components are neglected.

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  • Steam superheat temperature control is critical to the to correctly model and control the unusual transient efficient operation of utility boiler steam turbines. responses on the steam temperature that occur during Traditional Proportional-Integral-Derivative (PID) changes in boiler load as the turbine MW load varies.

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  • In general usage, the term steam engine can refer to either complete steam plants (including boilers etc.) such as railway steam locomotives and portable engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine. Steam-driven devices were known as early as the aeolipile in the first

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  • Steam generated by boiler with pressure and temperature is guided to do work on the turbine to provide mechanical power in the order of rotation. The former steam out of the turbine and then moved into the condenser to be frozen with cooling water that converted to water. Condensate water is then utilized again as boiler feed water.

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  • Steam Plant Characteristics er - Boiler control must respect dozens of rate limits mperature stresses, drum level, coal mills, feedwater heating al - Boiler Follow - Older plants - Primary response is steam turbine response - Steam turbine response can be very fast - 5% in 5 seconds - Useable Primary response is limited by boiler response

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  • With the turbine speed regulation already decided to be 5 percent with a DB of 1 rpm, the next step is to calculate the boiler calibration that will match the turbine response to frequency upsets.

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