Silencer Baffles / Attenuators

Absorptive Noise Control for Ducted Gas and Ventilation Applications

Description
Technical Data

Silencer baffles and duct attenuators are absorptive noise control products designed to reduce noise traveling through ducted systems while allowing gas or airflow to pass through. They work by directing flow between a series of internal acoustic splitters or baffles containing absorptive materials, which absorb sound waves from the airstream. Two product configurations are available: flue gas silencer baffles for high-temperature gas turbine and HRSG exhaust applications, and industrial noise attenuators in rectangular and circular configurations for ventilation and process air systems.

Both product types are custom-engineered using detailed acoustic analysis to meet project-specific noise reduction requirements, pressure drop allowances and duct geometry constraints.

Flue Gas Silencer Baffles

Design temperature: Up to 730°C
Materials: SS409, SS321, SS304, SS316 and galvanised carbon steel. Supports in CS, SS321, SS321H or Alloy 800
Duct shape: Rectangular or round
Orientation: Vertical or horizontal
Maximum baffle span: 9.2m
Applications: Simple cycle power plants, combined cycle power plants and combined cycle power plants with carbon capture
Options: FEA, CFD analysis and retrofit/upgrade configurations

Rectangular and Circular Attenuators

Construction: Outer steel casing designed to withstand internal duct pressures, with internal acoustic splitters or baffles containing absorptive material
Circular attenuator design: Central acoustic pod surrounded by absorptive material within a circular casing
Corrosion protection: External casing designed to protect against corrosion appropriate to installation location
Applications: Industrial ventilation, specialist extraction systems and air input for small and large-scale applications

WHICH SOLUTION IS RIGHT FOR YOUR APPLICATION?

	FLUE GAS SILENCER BAFFLES	RECTANGULAR AND CIRCULAR ATTENUATORS
PRIMARY APPLICATION	Gas turbine and HRSG exhaust systems	Industrial ventilation, extraction and process air systems
DUCT SHAPE	Rectangular or circular	Rectangular or circular
ORIENTATION	Vertical or horizontal	Vertical or horizontal
DESIGN TEMPERATURE	Up to 730°C	Ambient and low-temperature applications
FLOW CONDITIONS	High velocity and turbulent exhaust gas	Fans, blowers and compressors
ACOUSTIC PRINCIPLE	Absorptive	Absorptive
TARGET FREQUENCIES	Medium to high frequency noise	Medium to high frequency noise
TYPICAL INSTALLATIONS	Simple cycle and combined cycle power plants	Industrial facilities, manufacturing plants and HVAC systems
PRESSURE CONSIDERATION	Allowable pressure drop specified at design stage	Back pressure on fan or blower must be accounted for in system design
RETROFIT AVAILABLE	Yes	Yes — care must be taken to minimize pressure loss in existing systems

High-Temperature Capability

Flue Gas Silencer Baffles are engineered for exhaust gas temperatures up to 730°C, making them suitable for the most demanding gas turbine and HRSG exhaust environments including both simple and combined cycle configurations.

Ventilation Noise Control

Rectangular and circular attenuators are optimised for industrial ventilation and process air applications, controlling noise from fans, blowers and compressors in both small and large-scale systems.

Custom Acoustic Design

Both product types are designed using detailed acoustic analysis to meet project-specific noise reduction targets, duct geometry requirements and pressure drop constraints.

Relevant Industries

Oil and gas refineries, natural gas processing plants and LNG facilities represent remarkably intensive and acoustically challenging industrial environments, generating intense noise levels from complex processing equipment, high-pressure systems and continuous operations. Hydrocarbon processing facilities require comprehensive noise control solutions to ensure worker safety, regulatory compliance, community relations and operational efficiency.

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Power plants generate both energy and significant acoustic energy. Excessive noise can endanger employees, affect equipment longevity and violate local and international regulations. Burgess-Manning custom-engineers silencers for turbines, compressors, blowers, generators and transformers.

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Industrial applications generate considerable noise as a result of high-capacity machinery, continuous operations and complex infrastructure. Without proper noise control, these environments can pose risks to employee health, disrupt surrounding communities and violate environmental and occupational noise regulations. Implementing tailored noise mitigation solutions of acoustic walls, noise barriers and silencers while utilizing acoustic modeling, CFD, FEA and noise measurements to design solutions not only supports safety, but also enhances operational efficiency and community relations.

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Silencer Baffles/Attenuators FAQ

A silencer baffle is an absorptive noise control product designed to reduce noise traveling through ducted gas or airflow systems. Each unit consists of an outer steel casing containing a series of vertically aligned acoustic splitters or baffles filled with absorptive materials. Airflow passes between the baffles while sound waves are absorbed into the acoustic media, reducing noise at air intakes, exhausts and through ductwork systems.

Silencer baffles and attenuators direct airflow between a series of internal acoustic splitters containing absorptive materials. Sound waves from the airstream enter the acoustic media and are absorbed, while airflow continues through the unit. Units are sized based on the required level of noise reduction and the airflow volume required to pass through the system.

Attenuators impose a back pressure on the fan or blower in the system, which must be accounted for as part of the overall system design. When attenuators are retrofitted into existing systems, care must be taken to ensure the unit offers minimal pressure loss so that airflow rates are not significantly reduced.

Silencer baffles are used in high-temperature gas turbine and HRSG exhaust systems where flue gas temperatures and flow velocities require a purpose-engineered solution. Rectangular and circular attenuators are used in industrial ventilation and exhaust systems and process air applications for both small and large-scale installations.

Rectangular attenuators use parallel baffle configurations and are suited to square and rectangular ductwork systems. Circular attenuators are designed to match round ductwork and feature a central acoustic pod surrounded by absorptive material within a circular casing. Both types reduce noise from industrial ventilation and air movement systems while allowing airflow to pass through.