AVB Steam Drum Vane Bank

Designed for

The Steam Drum Internal Vane Bank is designed for boiler steam drums where dry, high-quality saturated steam is required to protect downstream equipment and improve boiler reliability. It helps reduce moisture carryover that can contribute to superheater scaling, turbine erosion, process contamination, corrosion, and inefficient steam system operation.

Key points of differentiation

• Purpose-built for steam drums. Designed specifically for internal boiler drum installation to improve steam-water separation.

• Exceptionally efficient vane design. Repeated directional changes force water droplets out of the steam path through centrifugal force and inertial impingement.

• Gravity drainage back to the drum. Captured water collects in shielded vane pockets and drains away from the steam flow to reduce re-entrainment.

• High steam quality. Supports dry saturated steam delivery to downstream equipment when properly sized and installed.

• No moving parts. Mechanical separation supports reliable operation with no routine maintenance components such as disposable filters or cartridges.

• Optional inlet coalescer. A mesh pad coalescer can be added ahead of the vane bundle to increase fine droplet size and improve removal of smaller particles.

Applications

The Steam Drum Internal Vane Bank is used in boiler steam drums to improve steam-water separation and reduce moisture carryover from saturated steam. It is applicable where steam dryness is critical to downstream system reliability, equipment protection, and process performance.

Principle of operation

The Steam Drum Internal Vane Bank separates condensate-laden steam through a series of controlled directional changes inside the vane bundle:

1. Steam/water mixture enters the vane bank. Condensate-laden saturated steam enters the internal vane bank as a two-phase mixture of low-density steam and higher-density water droplets.

2. Directional separation. The stream passes through Pocket Type vanes, where repeated flow-direction changes keep gas on the vane path while liquid droplets separate due to inertia.

3. Droplet impingement & coalescence. Separated droplets impact vane surfaces and merge into larger droplets, improving capture efficiency.

4. Liquid capture & drainage. Coalesced liquid is collected in shielded pockets to prevent re-entrainment, then drains by gravity to the collection area.

5. Dry steam discharge. Cleaned saturated steam exits the vane bank and moves toward the steam outlet with reduced entrained moisture and minimal re-entrainment.