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Baghouse Tips with Dr. Vent Goode

Are your system’s ventilation hoods effective?

Vent hoods are the point where gasses are suctioned into your ventilation system.  They are a very important component in the performance of your baghouse and discharge system, yet designers often pay little attention to their design and location.

To understand hooding design, first we need to understand the purpose of your ventilation system.  Or more precisely, what it’s not supposed to do.  With a few exceptions in process equipment, the ventilation system is NOT intended to suction dust.  Its purpose is just to keep your process equipment or your enclosure under negative pressure.  Some dust will inevitably end up in the baghouse, but it’s not intended to act like a vacuum cleaner.

Hoods have two basic functions:  They should minimize material carryover and they should minimize pressure losses at the pick-up points.  These two objectives can be accomplished with proper hooding design.

In a nutshell, the larger the hood, the lower the amount of dust suctioned.  And the more tapered, the lower resistance to flow.  There is obviously a physical and cost limitation, so rule-of-thumb guidelines are presented in design manuals to make them reasonably sized.  The typical recommendation is to form a square box as wide as the enclosure allows before tapering to the round ductwork.

hoodVent

Hooding position is also important to minimize material carryover.  Even a properly designed hood will end up suctioning excess material if it’s placed at the wrong location.  In general, hoods must be placed away from the source of dusting, as shown below.

hoodVent2

Properly designed and properly positioned hoods can make a big difference in your systems’ performance to reduce wear on filter bags and discharge system overload.

Call us to discuss your application with one of our engineers today!

Air Quality Workshop

WORKSHOP SCHEDULE

8:00 – Registration & Breakfast

8:30 – Keynote Speaker

9:00 – Block Andrews, Burns & McDonnell – “Compliance Strategies for the 21st Century”

9:45 – Jon Norman, UCC – “Case Study: Using Trona & SBC for High Level SO2 Removal”

10:30 – Break

10:45 – Steve Baloga, Novinda – “Amended Silicates™ for Hg Control”

11:30 – Mike Atwell, Solvair – “Trona: a viable solution for SO2, SO3, HCl, and HF”

12:15 – Lunch sponsored by Lhoist

1:00 – Rafic Minkara, Headwaters – “Flyash in a changing Air Emissions Market”

1:45 – Joe Wong, ADA Carbon Solutions – “Advanced Activated Carbons for MATS Compliance”

2:30 – Break

2:45 – Melissa Sewell, Lhoist – ““Dry Sorbent Injection with Enhanced Hydrated Lime”

3:30 – Art Dean, Pine – “To be Determined”

4:15 – Break

4:30 – Panel Discussion

5:00 – Cocktail Hour sponsored by United Conveyor Corporation.

There is no charge to attend this event. Please register online at http://airqualityworkshop.com/locations/houston-tx-nov-3rd/

View the testimonials from the 2014 Air Quality Workshop airqualityworkshop.com/testimonials

Air Quality Workshop

WORKSHOP SCHEDULE

8:00 – Registration & Breakfast

8:30 – Keynote Speaker

9:00 – Block Andrews, Burns & McDonnell – “Compliance Strategies for the 21st Century”

9:45 – Jon Norman, UCC – “Case Study: Using Trona & SBC for High Level SO2 Removal”

10:30 – Break

10:45 – Steve Baloga, Novinda – “Amended Silicates™ for Hg Control”

11:30 – Mike Atwell, Solvair – “Trona: a viable solution for SO2, SO3, HCl, and HF”

12:15 – Lunch sponsored by Lhoist

1:00 – Rafic Minkara, Headwaters – “Flyash in a changing Air Emissions Market”

1:45 – Joe Wong, ADA Carbon Solutions – “Advanced Activated Carbons for MATS Compliance”

2:30 – Break

2:45 -Melissa Sewell, Lhoist – ““Dry Sorbent Injection with Enhanced Hydrated Lime”

3:30 – Pramodh Nijhawan, IAC – “Novel Recirculation Scrubber”

4:15 – Break

4:30 – Panel Discussion

5:00 – Cocktail Hour sponsored by United Conveyor Corporation.

There is no charge to attend this event. Please register online at http://airqualityworkshop.com/locations/orlando-fl-october-7th/

View the testimonials from the 2014 Air Quality Workshop airqualityworkshop.com/testimonials

Air Quality Workshop

WORKSHOP SCHEDULE

8:00 – Registration & Breakfast

8:30 – Keynote Speaker

9:00 – Block Andrews, Burns & McDonnell – “Compliance Strategies for the 21st Century”

9:45 – Jon Norman, UCC – “Case Study: Using Trona & SBC for High Level SO2 Removal”

10:30 – Break

10:45 – Steve Baloga, Novinda – “Amended Silicates™ for Hg Control”

11:30 – Mike Atwell, Solvair – “Trona: a viable solution for SO2, SO3, HCl, and HF”

12:15 – Lunch sponsored by Lhoist

1:00 – Rafic Minkara, Headwaters – “Flyash in a changing Air Emissions Market”

1:45 – Joe Wong, ADA Carbon Solutions – “Advanced Activated Carbons for MATS Compliance”

2:30 – Break

2:45 – Melissa Sewell, Lhoist – ““Dry Sorbent Injection with Enhanced Hydrated Lime”

3:30 – Art Dean, Pine – “To be Determined”

4:15 – Break

4:30 – Panel Discussion

5:00 – Cocktail Hour sponsored by United Conveyor Corporation.

There is no charge to attend this event. Please register online at http://airqualityworkshop.com/locations/chicago-il-sept-9th/

View the testimonials from the 2014 Air Quality Workshop airqualityworkshop.com/testimonials