Vacuum-Pressure Transfer Systems

Vacuum Pressure Transfer

Vacuum-Pressure Transfer System

For certain applications, UCC recommends a “combination” pressure / vacuum transfer systems. These systems combine the simplicity and lower headroom requirements of a vacuum system under the hoppers with the high capacity and long distance conveying capability of a positive pressure system.

In a combination system, a short vacuum transfer system conveys ash from the hoppers to a transfer bin. A longer pressure system conveys ash from the transfer bin to a remote storage bin for disposal.

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Transfer System Performance Specs

Possible Combination NUVEYOR Vacuum transfer System and NUVA FEEDER Pressure System:

NUVEYOR Vacuum System:

• Ability to stop and restart due to low ash-to-air ratios

• Low headroom requirements below the fly ash collection hoppers

• Capable of handling a wide range of ash types

• Full load/no load control allow system to achieve rated capacity more efficiently

• Wear sections follow each change in pipeline direction

• Low maintenance at precipitator and economizer areas

• Single pneumatic valve under each hopper

• Single air intake per row

• One I/O per hopper valve

• No plugging

• Proven temperature tolerant design for large particle economizer ash

• Max Distance: 1,500 ft (4,500 m)

• Maximum Capacity: 80 TPH

• Mass Ratio ash : air: 5-22

• Air Velocity: 3,000 – 5,200 ft/min (16-27 m/sec)

• Maximum Conveyor Line Pressure: 20 in Hg (530 mm Hg)

• Maximum Prime Over Pressure:22 in Hg (560 mm Hg)


NUVA FEEDER Dilute Phase Pressure System:

• Dilute to medium phase conveying

• Long distance conveying without the need for a transfer vessel

• Capable of high capacity conveying

• Control system keeps the conveying line filled for longer periods, resulting in high conveying efficiency and lower operating costs

• Low sensitivity to ash characteristics; capable of conveying larger and more dense particles

• Proven ability to handle economizer ash

• Ability to stop and restart system operation without plugging due to moderate ash-to-air ratios

• Full load control prevents line plugging

• The use of a bin vent filter reduces maintenance on silo roof

• Highly stable condition with no pressure surges

• Ideal for high altitude applications where vacuum transfer systems are not effective

• Max Distance: 8,000 ft (2,400 m)

• Maximum Capacity: 175 TPH

• Mass Ratio ash : air: 5-22

• Air Velocity: 2,400 – 4,800 ft/min (12-25 m/sec)

• Maximum Conveyor Line Pressure:40 psi (275 kPa)

• Maximum Prime Over Pressure:45 psi (300 kPa)