BOILERS DEIONIZATION ION EXCHANGE MONITORING POWER REVERSE OSMOSIS

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Abstract

Fossil fueled power plants have a variety of configurations for producing high-pressure steam to drive a steam turbine coupled to a generator for power production. For coal-and oil-fired power production units, the standard configuration is either a drum boiler cycle, or a once-through boiler cycle. Figure 1 provides a typical schematic of a drum-boiler cycle. The cycle is a ﾓclosed systemﾔ, typically with minor water/steam losses such that the rate of makeup is in the range of 1% to 2% the flow of feedwater to the boiler. Makeup water is introduced into the condenser where the steam exhausting from the low-pressure section of the turbine is condensed (typically at a temperature of 30 to 45oC). From there, the water is forwarded through a number of low-pressure shell, and tube heat exchangers, where extraction steam from the turbine is directed to the shell side of the heat exchangers to preheat the water prior to introduction to the boiler. A contact heater (deaerator) may also be included in this train where steam is contacted directly with the boiler feedwater for the purposes of dearation.

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