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AIR-HANDLING BLOWERS

Industrial aeration involves moving air through either a solid or fluid medium bed and is used for various purposes. Depending on specific material being aerated, our fans are utilized for moisture control in applications such as grain bin storage, and also provide oxygen and control moisture/temperature in composting applications. Due to varying environmental conditions, fans used in aeration systems often require special construction such as fiberglass, alloys and specialty coatings. The control and containment of air containing a biological hazard is crucial for maintaining a safe environment. An air handling system designed to move such material must be designed to ensure contaminated air does not escape. This can be accomplished with an induced draft fan that will maintain a negative pressure, so that any leaks in a system draw outside atmosphere in, as opposed to allowing the contaminated air out. Biomass and Incineration are two new methods of generating power that utilize renewable biological fuels and refuse as their main fuel source. The process of converting these fuels into an energy source requires the use of specialized boiler system. Issues such as dust loading and corrosion can become major concerns if your system does not utilize the proper fan for exhausting particulate and gas emissions. That is why selecting the right fan is crucial for optimizing the performance and longevity of your overall system. We offer a wide range of underfire combustion air fans, overfire air fans and induced draft fans needed to stand up to the harsh operating environments.

In the textile industry, humidity of the air is crucial for air quality and fabric production. The fibrous material manufactured in plants needs to maintain a specific humidity and temperature to be processed effectively. Textile manufacturers use air washers to cool, humidify, dehumidify and clean the air to prevent damage during production. Drum filters are typically used in the nonwoven industry for manufacturing products such as diapers, sanitary napkins, and surgical pads. Drum filters have become the standard in the nonwoven industry and are known for their efficiency and compact designs with relatively large air flows. Twin City Fan is a leading supplier of the main system fans located on the clean side of the process. Buffalo Blower fans are often selected for this particular application because of their ability to cover a wide performance range and various operating conditions. Forming fans play an integral role for forming products in the nonwoven industry, such as diapers. These fans create the negative pressure in the forming chamber, giving the product its shape. We typically provide our model RBW radial bladed fan with a backplate for this application. The RBW is capable of producing high static pressures at medium to low airflows.

Air washers balance the required humidity of the plant air by humidifying the air during the dry seasons and dehumidifying the air when conditions are more humid. This is accomplished by using re-circulated heated or chilled water that is sprayed into the air. Buffalo Blower fans are used to draw air through these air washer systems and typically provide adjustable pitch axial fans in the range of 2.5″ to 4″ static pressure. Regardless of the size of your operation and system requirements, Buffalo Blower is capable of manufacturing virtually any size fan or blower to meet your exact specifications. Air strippers are used on drum filters for removing material build up on the filter. The vacuum nozzles on the filter remove the fiber/particulate which are then disposed of or used for reclaiming the material. The fans used in this particular application require higher pressure at a relatively low airflow along with a radial blade design for handling the material. Because of these factors Buffalo Blower model ORB incorporates radial blades with a backplate to prevent long stingy material from collecting around the shaft.

Flue gas recirculation is a highly effective technique used for lowering Nitrogen Oxide (NOx) emissions from burners. This is particularly crucial, as NOx is a significant pervasive pollutant that produces a negative array of health and environmental by-products. NOx emission levels can be greatly reduced in industrial boilers by reticulating used flue gases back into the system. This process lowers the peak combustion temperature and drops the percentage of oxygen in the combustion air/flue gas mixture, delaying the formation of NOx caused by high flame temperatures. TCF offers a wide range of centrifugal blowers specifically designed to be used with FGR systems.

Forced Draft fans purpose is to provide a positive pressure to a system. This basic concept is used in a wide variety of industries but the term FD Fans is most often found in the boiler industry. Fans for boilers force ambient air into the boiler, typically through a preheater to increase overall boiler efficiency. Inlet or outlet dampers are used to control and maintain the system pressure. Typical fan arrangements are 3SI or 3DI which utilize a wheel center hung on the shaft with integral inlet boxes.

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PLENUM FANS

Plenum Fans are designed specifically for application in pressurized plenums found in industrial and commercial air-handling systems. The unhoused, compact design combined with the choice of two AcoustaFoil® wheels provides the utmost in quiet and efficient operation.

DESIGN FEATURES

• Two wheel choices: High-efficiency AcoustaFoil wheels, Sizes 12” – 73”. Ultra-quiet AcoustaFoil-Q wheels for sound-sensitive applications, Sizes 18” – 66”.
• Capacities to 160,000 CFM.
• Pressures to 12” WG.
• Aerodynamic, spun inlet cone.
• Choice of four horizontal arrangements:
Arrangement 1 —Sizes 12” to 15”
Arrangement 3 —Sizes 16” to 73”
Arrangement 3-P—Sizes 16” to 40”
Arrangement 4 —Sizes 12” to 60”
• Arrangement 3-V for vertical mounting in Sizes 16” to 73”.
• Designed and tested to eliminate all natural frequencies in the operating range.
• Temperatures to 120°F.

CONSTRUCTION FEATURES

• Formed structures for rigidity and improved fit.
• Bearings selected for average L10 life of 40,000 hours at maximum speeds.
• Lifting eyes are standard.
• Wheels are dynamically balanced and fans are checked at the specified operating speed.

Unhoused Plenum Fans were developed in response to the continuing push for greater system value and application flexibility in air-handler systems. For systems utilizing pressurized plenums, these fans provide the airflows and pressures of conventional housed fan designs but in compact, more economical configurations. The result is reduced size and weight of air-handler cabinetry with maximum application flexibility. System air is supplied or returned to the air handler from virtually any direction with a minimum of ductwork. Plenum Fans offer system manufacturers the utmost in choice of sizes and configurations.

A traditional airfoli plenum fan wheel ensures:

STABLE PERFORMANCE

Completely stable pressure curve from wide open to closed-off…ideal for variable air volume systems.

NON-OVERLOADING

Horsepower reaches a peak and then decreases as flow increases… allows calculation of the maximum brake horsepower at a given fan speed so a motor can be selected that will not overload if system pressure changes.

CHOICE OF TWO ACOUSTAFOIL WHEEL DESIGNS:

TRADIDIONAL AIRFOIL FAN WHEEL

EFFICIENCY: The mechanical efficiency curve offers a broad selection range with little horsepower variation.
SOUND: The superior efficiency of the AcoustaFoil wheel provides a low sound level over a wide performance range.

ULTRA-QUIET ACOUSTAFOIL-Q WHEEL

For sound-sensitive applications. After years of acoustical research and testing in two accredited sound testing laboratories, our time-tested AcoustaFoil Fan Wheel technology is quietly taken to the next level.

STABLE AND EFFICIENT PERFORMANCE: Same efficiency and horsepower characteristics as the traditional AcoustaFoil wheel.
NEW SELECTIONS: Unique performance offers alternative selections to the traditional AcoustaFoil wheel.
SOUND: Acoustically tuned wheel and cone reduces sound power levels in the lower octave bands, flattens overall sound profile, and also minimizes fan blade pass frequency turbulence.

Both airfoil Plenum Fan wheels are designed to operate efficiently at less than maximum design airflow. The high efficiency and inherent stability of the AcoustaFoil wheel is particularly well-suited to variable airflow systems. The AcoustaFoil wheel design ensures not only maximum operating efficiency at design CFM but also at reduced airflow regardless of the control method applied. This higher efficiency allows quieter operation throughout the modulation range.

INLET-VANE DAMPER CONTROL

Inlet-vane dampers affect the fan’s output by spinning the air in the direction of wheel rotation. With this prespin, the wheel cannot develop its full output, yielding a reduced CFM at reduced horsepower. Each damper setting creates new pressure and horsepower curves. With inlet-vane dampers, reduced airflow always results in reduced horsepower.

VARIABLE FREQUENCY MOTOR SPEED CONTROL

Variable frequency motor speed controllers provide energy savings by directly controlling fan speed. From the fan laws, CFM varies directly with the change in fan speed and horsepower varies by the change in fan speed 20% reduction in fan speed yields a 20% reduction in airflow and a 50% reduction in BHP. Controllers must have lockouts to prevent operation beyond the maximum safe speed of the fan.