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In extraction condensing steam turbines, it is possible to extract steam from the turbine at one or more pressure stages to feed it into a heating condenser of the district heating system.
For maximum boiler load the thermal energy transferred in the preheaters, which extract steam from the LP turbine, decreases from 147 to 18 MW, compared to the operation without heat extraction.
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The quantity of the extracted steam used for the city-wide heating system is additionally controlled by the throttles regulating the extracted steam into the basic or peak heater.
In bleeder turbines no effort is made to control the pressure of the extracted steam, which varies in almost direct proportion to the load carried by the turbine.
In the solar aided coal-fired power plant, solar heat at <300 °C is used to replace the extracted steam from the steam turbine to heat the feed water.
Finally, the match between the extracted steam and the heat demand of the reboiler is significantly increased, which solves the steam parameter mismatch problem.
The following cogeneration systems are considered: conventional cogeneration system (CCS), cogeneration system with AHP driven by extracted steam (CSAES) and cogeneration system with AHP driven by solar (CSAS).
It shows how limits on extracted steam flows truncate a significant part of the theoretical possibility set in an extraction-condensing turbine.
In addition, under the current feed-in tariff (FiT) and water prices in Cyprus, extracting steam for MED is not recommended.
This results in a double throttling of the extracted steam of the turbine, double generated entropy and a double loss of work.
At the baffle point, the extracted steam from the turbine exists as a two-phase fluid at high temperature, high pressure, and high velocity.
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