Selection of an Airtorch®
Energy Savings with an MHI Airtorch®.
Steps to determine the temperature and power.
Best way. Please Contact MHI.
Step 1: Determine the temperature required for your part.
This will help estimate the corresponding Airtorch® exit temperature. Note that manufacturers report the Airtorch® temperature with the t/c located inside the end of the exit tubing of any model (so that external exit conditions do not alter it). This is common to all devices so that discharge conditions do not unduly influence this rating temperature. The TA models (LTA, MTA925, GTA925, VTA) offer an exit temperature of about 925°C. The higher-temperature MVTA, GVTA, and DPF models are rated to 1000°C/1300°C. If you plan to extend the Airtorch® exit piping, please note that well-insulated pipes will drop the temperature very little, as the exit velocity is in m/s. Please contact MHI when required. A helpful but rough rule of thumb may be about 50°C-100°C per meter drop for good internal pipe insulation. Good pipe insulation depends on the insulation type and whether the pipe is internally or externally insulated. The industry standard is about 1-2″ thick insulation—Energy Savings with MHI Airtorch®. Savings with MHI Airtorch®.
Save with MHI. MHI Airtorch® models offer very low-pressure drops. For example, saving a 5psi pressure drop for 2000 SCFM flow amounts to a savings of close to 30 kW power. Call MHI and compare.
Step 2: Power and Flow Rate.
(a) Is the application schematically described as Direct Impingement, Inline, or Process Air/Gas Preheating, as shown in the schematics on this page? For applications with a desired flow rate at a particular temperature, please refer to the diagrams provided or the easy calculators to calculate power. A good rule for such applications is to choose the highest-temperature model available and a power that will quickly heat the impingement area to the required temperature. For extensive flow Airtorch® use, please get in touch with MHI.
(b) Is the application schematically described as an augmentation/uniformity enhancer or retrofit/upgrade (typical schematics also shown in Choosing Airtorch®)? In such applications, one will add the Airtorch® to a furnace, vat, or chemical reaction chamber of known power and temperature or perhaps contemplate a completely new furnace. For a new furnace, the power is calculated by knowing the thermal properties of the chamber and its contents and then calculating how fast a temperature rise is required. If you are building a furnace from scratch, a simple-to-use calculator for the energy and power needed to maintain a steady state in a chamber with no load could be helpful as the first step in furnace design. For the augmentation, because Air or gas has to be exhausted to maintain a steady mass flow rate, the Airtorch® augmentation power is calculated from the Energy from Airtorch(R) at the high temperature into the furnace chamber minus the energy out from the furnace to the ambient. As an approximation, one could think of this augmentation power as equal to the [Mass flow rate x specific heat x {[(T(Airtorch®)- T(Furnace))- (T(Furnace)- T0 (Ambient))]}. Temperatures are in Kelvin or Centigrade. The flow rate/kW for a given Airtorch® is provided in the graphs. This means that for any DPF or TA model with a rated temperature and power, it is relatively easy to calculate the augmentation power at a steady state inside the furnace that is being augmented. A good rule of thumb for furnace augmentation applications is to choose the Model with at least a 300°C rated exit temperature, at least 300°C higher than the furnace temperature. Choose an Airtorch® power that exceeds about a third of the original furnace power.
(c) When employed as a waste-gas cleaner, please follow SCFM vs. temperature calculators
(d) For high flow and/or for a high-pressure enclosure for significant industrial chemical reactions, please click to
- Large Flow MVTA. For 1000-1200°C. These are sealed process gas heaters (THN or DNA class) with a blower or inline capability. High KW – High Flow. 200 KW to 4 MW. Voltages 380V, 400V, 440V, 480V, 600V.
- Large Flow GTA – For high-pressure vessel Airtorch® use. Custom engineering. Please contact us directly for assistance.
New: Inline-Airtorch® models. The output is up to 1200°C.
