Designing a high pressure feed water heater

June 13th, 2014, Published in Articles: Energize

 

In a power generation process, the heat generated in the boiler can be used for heating purposes in other parts of the power plant in order to improve overall efficiency. A wide range of heat exchangers are used in power stations, some of which are feed water heaters, which are used to raise the temperature of the feed water before it enters the boiler economiser. This article describes the design of an efficient feed water heater.

bilfinger_designing-high-pressure-feed

High pressure (HP) feed water heaters are used to heat up the boiler’s feed water at high pressure and temperature before it passes back to the boiler. Fig. 1 shows an example of a shell and tube type heat exchanger which would be fitted between the feed pump and boiler. Fig. 2 shows an example of three HP heaters connected in series. To ensure the reliability of HP heaters, the quality and tightness of tube to tube plate connections are important. Depending on the design, heaters can be installed vertically, head down or head up and horizontally. This normally depends on the space available at the operational site.

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