| In industrial backpressure power plants backpressure in normally kept constant in full and partial loads due to process requirements. As shown in the following figure, steam can also be extracted from the turbine at higher pressure levels and used either in industrial processes or for the power plant's own use such as heating of feed water in a feed water tank. However, internal steam consumption of the power plant cannot be considered as CHP Heat | ||
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The higher the backpressure or the higher the pressure of extractions, the less electricity can be generated in the steam turbine. In other words, the expansion of steam is shorter in a backpressure turbine than in a condensing turbine, and therefore the heat energy contained in backpressure steam could still be used in a condensing turbine to generate more electricity. Depending on the industry, one part or in some cases almost all of the process steam can be recovered back to the power plant process as a form of condensate. This also has an effect on the heat consumption, since the temperature of the condensate is normally almost 100 oC and the recovery of condensate also means the recovery of remaining heat. |
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