What Is a Feedwater Heater?
A steam-water heat exchange device that utilizes steam extraction from a steam turbine to heat boiler feedwater. Also called reheating heater.
Water heater
discuss
- Chinese name
- Water heater
- Alias
- Reheat heater
- Principle
- Extraction from the middle of a steam turbine
- Brief introduction
- Steam-water heat exchange device for feed water
- A steam-water heat exchange device that utilizes steam extraction from a steam turbine to heat boiler feedwater. Also called reheating heater.
- In the Rankine cycle, the heat that accounts for more than 50% of the total heat of the working medium is taken away by the cooling water in the condenser, causing losses. Using feed water heating is an effective way to reduce this loss. This cycle with feed water heating is called a regenerative cycle. In order to obtain the maximum effect of feedwater reheating, the feedwater heating stages of modern high-parameter large-capacity intermediate reheating units generally adopt 7 or 8 stages.
- Feed water heaters include high and low pressure heaters and deaerators. The low pressure water heater located between the condenser and the deaerator is the low pressure heater, and the high water pressure behind the feed pump is the high pressure heater. Feed water heater can be divided into surface type and hybrid type according to the steam and water heat transfer method. Low-pressure heaters are mostly surface-type, and high-pressure heaters are all surface-type. Surface heaters are divided into two types: pan incense tube type and U-tube type according to the structure. The U-tube type is divided into vertical and horizontal types according to the water inlet position and layout, and is divided into two types of vertical type and side vertical type according to the water inlet position. In order to increase the outlet temperature of the heater under the condition of constant extraction pressure, the heater of the large-capacity intermediate reheating unit is provided with a superheated steam cooling section and a hydrophobic cooling section.