Regular Drainage Expansion VesselIt is a key equipment in the boiler system, primarily used for handling regular waste water排放, achieving heat recovery, and分流 of wastewater. The core points are as follows:

I. Definition and Functions

‌Definition: A pressure vessel that separates boiler blowdown into secondary steam and waste hot water through pressure reduction and expansion, classified as an energy-saving and environmentally friendly equipment.‌

Core Function: Reduces effluent pressure and separates secondary steam (reusable) and waste hot water (requires cooling before discharge) using flash vaporization evaporation principle.

II. Process Workflow

‌Input Stage: After reducing pressure through a throttle valve, the boiler's effluent enters the surge tank tangentially, forming a swirling flow._

‌Separation Stage: The effluent is insulated and expanded within the container, part of which evaporates into secondary steam. After being purified by the top louvre 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: The secondary steam can be introduced into a deaerator or other thermal system, and the waste hot water's residual heat can preheat softened water.

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

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

IV. Distinction from Continuous Discharge Expansion Vessels

‌Application Differences: Regular drainage focuses on removing bottom sediments, while continuous drainage 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 the above design, the regular effluent expansion tank reduces boiler heat loss and improves system efficiency while ensuring the long-term safe operation of the boiler.‌。