Physical Models

The physical flow modeling group at NELS has over 30 years of experience working on hundreds of studies for domestic North American projects and around the world. Our list of clients is very extensive and includes OEM and end-users who have implemented successful solutions and designs developed through the NELS physical modeling process.

The physical flow modeling division of NELS has extensive experience in the areas of power generation, ferrous and non-ferrous metal production, cement and other industrial systems.

The following list is just some of the equipment that has been modeled by NELS:

  • Electrostatic precipitators
  • Fabric Filter (baghouse) Installations
  • Mechanical Collectors (multi-clones, cyclones)
  • HRSG (with a very large variety or turbine exhaust types)
  • PC Boilers
  • CFB Combustors/Boilers
  • Boiler back-pass (Economizers/air heaters (rotary/ tubular)
  • SCR systems (Coal fired/Gas fired)
  • Flue Gas Desulphurization (WFGD/SDA/CFB)
  • Wet and Dry Stacks
  • Mist eliminators
  • Combustion air systems (windboxes, supply air ductwork)
  • Coal/Oil/Gas fired burners including Low NOx
  • Coal Pipe and Riffler systems
  • Furnaces (power generation/metal production)
  • Heat Treatment Ovens
  • Various Manufacturing/Industrial systems
  • Ductwork systems including Fan inlets (centrifugal/ axial)

Typically, the cold flow three dimensional physical models range from 1/12 scale to full scale models of various systems. The models are constructed with attention to detail and include all necessary elements to properly simulate the system being studied. Models are constructed to maximize flow visualization and measurement of critical performance criteria in the areas of flow distribution, temperature and gas mixing. Some models are also used to evaluate two phase (water-gas or particulate-gas) to determine deposition zones, particulate distributions and erosion problems areas.

NELS constructs and assembles all of the physical flow models at our laboratory site for ease of modification and to improve quality control.

Our instrumentation used to measure flow (water/gas), temperature, gas concentration and particulate concentrations is extensive and state of the art. Equipment includes a variety of anemometers, manometers, temperature probes, combustion gas analyzers, vibration sensors, accelerometers, acoustic and high speed data acquisition systems. Additionally we have specialized high speed camera and photography equipment for detailed flow visualization.

NELS has been able to provide successful, cost effective and practical solutions for a wide range of flow related systems. Although there is a perception that physical models are costly and time consuming, quite often they are most timely and most effective tool to solve a flow related problem. There is a very extensive history of excellent correlation between physical models and full scale systems which have been verified through field testing and comparison to model results.