The expansion tank of the drain pipe is a boiler water treatment equipment that realizes the continuous drainage of the steam drum, separates the steam and water, and recovers heat. Common drainage methods mainly include steam-liquid two-phase flow traps,
Universal Valve traps, float traps, and drainage methods using small pipe diameters. When the quality and amount of sewage discharged from the power plant are not fixed, the purpose of reducing the amount of wastewater discharged and the amount of steam discharged from the expansion tank can be achieved by adding a Universal Valve for continuous drainage.
The continuous drainage of the drain pipe is controlled by a
Gate Valve. When the continuous drainage level rises to the specified height, the Gate Valve is opened to drain the water. This can extend the retention time of the continuous drainage in the expansion tank as much as possible, fully gasify it, and reduce the heat and clean water loss during sewage discharge.
If the drain pipe of the continuous expansion tank is replaced by a pipe with a very small diameter, the continuous discharge volume is unstable and the water level is difficult to control. When the discharge volume is less than the maximum flow rate of the pipe, the deaerator steam will flow back and cause the loss of working fluid. When a large amount of water suddenly enters the continuous expansion tank, the sewage cannot be discharged quickly, which may easily cause the continuous expansion tank to be filled with water.
