7000m³h dust removal induced draft fans

This article's table of contents introduction:

1. What is it?
2. Key Components & Considerations
3. Typical Applications
4. Example Order Specification
5. Typical Sizing (Rough Estimates)

This is a specification for a piece of industrial ventilation equipment. Here is a detailed breakdown of what a 7000 m³/h dust removal induced draft fan is, its typical applications, and key specifications to consider.

What is it?

• 7000 m³/h (Cubic Meters per Hour): This is the airflow capacity. It means the fan moves 7,000 cubic meters of air (containing dust, fumes, or particles) every hour. This is a moderate to high flow rate, suitable for a single large dust collection point or a small-to-medium central system.
• Dust Removal: The fan is designed to handle air that contains solid particulates (dust, wood chips, metal shavings, smoke). It is typically built with wear-resistant materials and a robust impeller.
• Induced Draft Fan (ID Fan): This means the fan is placed after the dust collector (e.g., baghouse, cyclone, or cartridge filter) or at the end of the system. It creates a negative pressure (vacuum) upstream, pulling dirty air from collection hoods, through ducts, and through the filter. The fan primarily handles clean or semi-clean air (post-filter), protecting it from the most abrasive dust.

Key Components & Considerations

When specifying or buying a 7000 m³/h dust removal ID fan, you need to check these parameters:

1. Static Pressure (Pressure Rise): This is critical. You need to know the resistance of your entire system (ductwork, filters, cyclones). Measured in Pascals (Pa) , mmH₂O, or inches W.g. .
   • Example: A system with long ductwork and a high-efficiency baghouse might require 2000-3000 Pa. A simple system with a cyclone might only need 1000-1500 Pa.
   • Motor Power (kW) is directly related to Flow x Pressure.
2. Fan Type (Impeller Design):
   • Backward Curved (BC): Best for high efficiency, low noise, and clean air (good for ID fan post-filter). Less prone to dust buildup.
   • Radial (Paddle Wheel): Rugged, handles high dust loads and sticky materials, but less efficient and noisier. Often used in the dirty side (before the filter).
   • Forward Curved (FC): High volume at low pressure, less suited for dust.
3. Material of Construction:
   • Impeller: Carbon steel is standard. Stainless steel (SS304/SS316) if handling corrosive fumes (chemicals, acid). Abrasion-resistant liners (e.g., AR400, ceramic tiles) for very abrasive dust (sand, metal grinding).
   • Housing: Carbon steel with wear-resistant patches.
4. Motor:
   • Typically a standard 3-phase induction motor (IEC or NEMA).
   • Power (kW): For 7000 m³/h, expect a range like 3 kW to 11 kW, depending on the required static pressure.
   • Speed: Direct drive (motor speed = fan speed) or belt drive (allows speed adjustment). Belt drive is common for flexibility.
5. Drive Type:
   • Direct Drive: Compact, higher efficiency, fixed speed.
   • Belt Drive: Allows speed changes via pulley adjustment, which changes flow and pressure. Cheaper motor replacement.

Typical Applications

• Industrial Workshop Ventilation: Removing welding fumes, grinding dust, or wood chips from a shop floor.
• Central Dust Collection Systems: Serving 2-5 machine tools (saws, sanders, grinders) or a single large source like a bagging station.
• Baghouse / Cartridge Filter Systems: The "ID" fan is the last component, pulling air through the filter media.
• Chemical & Pharmaceutical Plants: Handling fine powders or fumes (often with explosion-proof motor and housing).
• Woodworking & Furniture: Collecting sawdust, shavings, and sanding dust.

Example Order Specification

To order or quote a 7000 m³/h dust removal ID fan, you must provide these minimum details:

"We require an Induced Draft Fan for a Baghouse System. - Airflow: 7000 m³/h (at operating point) - Static Pressure: 2200 Pa (or 224 mmH₂O) - Fluid: Air with fine cement dust (post-filter) - Temperature: Ambient (25°C) up to 60°C - Impeller: Backward Curved, 1.5mm SS304 - Housing: Carbon steel with 4mm wear plate - Drive: Belt driven - Motor: 7.5 kW, 1450 rpm, 3-phase, 415V, IP55 - Accessories: Inlet box, manual damper, vibration isolators."

Typical Sizing (Rough Estimates)

In short: A 7000 m³/h dust removal ID fan is a workhorse for medium-scale filtration. The most common mistake is buying a fan with the right flow but too low a pressure rating, causing poor performance. Always calculate system resistance before purchasing.