We offer a variety of technical and engineering services to meet your needs

Using a combination of physical and CFD models, as well as pilot systems and in-field testing/troubleshooting; we are uniquely positioned to provide cost effective solutions for our clients

Physical Flow Modeling

Our physical flow modeling team has developed and implemented hundreds of successful designs for North American and International projects, ranging from OEM to end user clients

To complement our physical model building capabilities, our team has access to an extensive range of state of the art instrumentation to effectively conduct any flow model study required.

  • Anemometers
  • Manometers
  • Temperature Probes
  • Acoustic & High Speed Data Acquisition Systems
  • Vibration Sensors
  • Accelerometers
  • Combustion Gas Analyzers
  • High Speed Cameras

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Computational Fluid Dynamics Modeling

The CFD modeling division at Nels has over a decade of experience providing practical solutions for both power generation and industrial systems

The following are samples of equipment we have modeled utilizing CFD;

  • Electrostatic Precipitators
  • Fabric Filter Baghouses
  • HRSG
  • PC Boilers
  • SCR Systems
  • Ammonia Injection Grids
  • Ductwork Systems
  • Activated Carbon Injection Systems
  • Large Particle Ash Collection Systems
  • Flue Gas Desulphurization
  • Wet & Dry Stack Liners
  • Stack Exhaust Downwash

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Field Testing Services

Our field testing services division has extensive experience testing full scale systems on-site in all industries to meet our clients needs

In addition to the testing services described above, we also have demonstrated experience in the following;

  • ESP Performance Testing
  • Fabric Filter Testing
  • SCR Performance Testing
  • Scrubber Performance Testing
  • Air Heater Performance Testing
  • Boiler Performance & Set-up
  • High Temperature Boiler Camera Inspection
  • Water Cooled Probes for Measuring in Convective  Sections of Boilers
  • Burner Optimization
  • Coal Pipe Air/Fuel Balancing
  • Combustion Air/Window Flow Measurement & Meter Calibration
  • Over Fire/Secondary Set-up & Balancing

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Specialized Fabrication & Equipment

We have the facilities to fabricate custom components and test equipment/rigs to keep our clients operating efficiently and safely

Fabrication Capability


  • Woodworking, Plastic Forming
  • Sheet Metal
  • Welding

Specialized Test Rigs On-site


  • Mist Eliminator
  • Full Size Gas Fired Burners
  • Nozzles (Hydraulic & Air Atomized)
  • Two Phase Burner/Coal Pipe
  • Stack Exit/Downwash
  • Particulate Fluidization
  • Erosion Testing

Equipment for Client Purchase


  • Custom Flow Probe Assemblies

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At Nels we build, assemble and store all physical models on-site for ease of modification and to ensure quality control for our clients.


Our Cold flow 3D models range from 1/12 to full scale, and are fabricated with the utmost attention to detail to ensure that all necessary elements to properly simulate the system are included.


Additionally, we construct our flow models to maximize flow visualization and ease of measurement for critical performance criteria. We have the capacity to simulate flow distribution, temperature and gas mixing. As well as, two phase  (water-gas or particulate-gas) conditions to determine to deposition zones, particulate distributions and erosion problem areas.

Below are a few examples of equipment we have modeled for our clients;

  • Electrostatic Precipitators
  • Fabric Filter Baghouses
  • Mechanical Collectors (Multi-clones, Cyclones)
  • HRSG
  • PC Boilers
  • CFB Combustors &Boilers
  • Economizers & Air Heaters (Rotary, Tubular)
  • Flue Gas Desulphurization
  • Wet and Dry Stacks
  • Mist Eliminators
  • Combustion Air Systems
  • Coal/Oil/Gas Fired Burners
  • Coal Pipe and Riffler Systems
  • Furnaces (Power Generation, Metal Production)
  • Heat Treatment Ovens
  • Ductwork Systems
  • Various Manufacturing & Industrial Systems

Typical projects our CFD modeling team undertake include pollution control, combustion and species injection optimization.


We are also capable of optimizing system pressure losses, velocity distributions, temperature mixing, species mixing and concentrations.


Furthermore, we can also provide particulate tracking/concentration, droplet  trajectories and evaporation, acoustical characteristics and heat transfer study services.

In our experience utilizing detailed CFD models coupled with our physical modeling process, has proven to be successful at obtaining cost effective and practical solutions for a wide range of flow related problems. By combining the best elements of each modeling technique an optimized solution is rapidly developed, effectively reducing project turn-over time for our clients.

Our technicians are ready to travel anywhere to support our clients in key areas of the operational capacity;


  • Mechanical inspection of flow related equipment, including verification of flow distribution and liquid collection devices
  • Inspection and troubleshooting on all types of pollution control equipment
  • Cold air velocity tests for electrostatic precipitators
  • Velocity, temperature, pressure and gas constituents for supply air and exhaust system ductwork
  • US-EPA protocol stack testing

Although we can perform standard testing for RATA/EPA compliance; it's our diagnostic skills and innovative approach which includes design and implementation of custom instrumentation/test methodologies that sets us apart from standard testing groups. Using our experience in solving flow related issues, our technicians can provide preliminary diagnosis and solution development to performance problems on a large variety of pollution control and combustion related equipment

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