Regular Waste Water Expansion Vessel

Regular drainage expansion tankIt is a key equipment in the boiler system, primarily used for treating regular waste water, achieving heat recovery, and分流ing waste water. Below are its core points:

I. Definition and Function

‌Definition: A pressure vessel that separates boiler blowdown into secondary steam and waste heat water through减压扩容, classified as an energy-saving and environmentally friendly equipment.‌

Core Features: Reduces effluent pressure and utilizes flash vaporization to separate secondary steam (reusable) and waste hot water (requires cooling before discharge).

Section II: Process of Operation

‌Input Stage: Boiler effluent, after being减压 through a throttle valve, enters the surge tank tangentially, forming a rotating flow.

‌Separation Stage: The wastewater undergoes insulated expansion within the container, part of which evaporates into secondary steam. After being purified through the top louvered steam-water separator, it is discharged.‌

‌Emission Stage: The remaining waste hot water is discharged after being processed through the water level regulating valve or the effluent cooling pool.‌

Section 3: Design and Application Key Points

Heat Recovery: Secondary steam can be introduced into a deaerator or other thermal system, and waste hot water's residual heat can preheat softened water.

Emission Control: Regular effluent discharge primarily targets sediment at the bottom of boilers, with an emission rate of approximately the evaporation volume of the boiler.0.1%-0.5%‌。

Safety Design: Safety valves, operating platforms, and steel support structures must be configured to ensure the safe operation of pressure vessels.

IV. Distinction from Continuous Effluent Expansion Containers

‌Purpose Difference: Regular waste discharge focuses on removing bottom impurities, while continuous waste discharge is used for controlling the salt content in the boiler water.

‌Discharge Frequency: Regular waste discharge with intermittent operations as needed; continuous discharge requires stable control of discharge rate (about1%）。

Through this design, the regular effluent expansion tank reduces boiler heat loss, improves system efficiency, and ensures the long-term safe operation of the boiler.‌。