Airtorch™ Air and Process-Gas Heaters
The Airtorch™ is a highly scalable electric process air heater typically utilized as shown in the Airtorch Infographic (or click on any picture on the side bar). Airtorch™ process heating may also be used for augmenting or heating existing ovens and furnaces. They offer high flexibility and greater control of your process heaters (room temperature is assumed as 25°C for input). Several models available in each class. MHI provides double flanged, NPT and multi-flanged heaters to ASME specifications as required. Simple 5-step selection guide and flow as a function of temperature for various models.
Single Phase Power. When comparing, please ask for Airtorch power efficiency and the heat-up rate.
For example at 1100°C (2012°F) a better efficiency could be reflected in the KW for heating a amount of air or process gas (SCFM, liters/min, kg/hr, m3/hr). Please contact MHI.
Another measure of efficiency is the manufacturers warranty on the heater at the rated highest temperature.
- High Power MVTA or High Pressure GTA
LTA - Up to 900°C. LTA is a process heater for air which requires a compressed air input.
VTA - Up to 900°C. VTA is process gas heater with fan or blower capability. Please also see GVTA.
MTA - Up to 925°C. MTA925 is sealed process gas heater which can take compressed air or compressed gas input.
DPF - Up to 1150°C-1200°C/~2150°F. DPF models can take fan or blower input as well as a compressed air/gas input.
- High Power MVTA or High Pressure GTA
*Unit Life and Safety: MVTA units provide forgiveness for temperature exposures beyond their rated capacity even by an extra 100°C for many models.
Very High Temperature
Operating Temperatures to 1150°C-1200°C/~2150°F. DPF models can take fan or blower input as well as a compressed air/gas input.
MHI special technologies allow for:
Inlet temperatures can be high on specific models MVTA.
Pressure drop: Very Low. MHI offers DirectFlow™ Airtorch.
We take advantage of our combined thermal knowledge across diverse equipment offerings to optimize and provide low friction Airtorch systems.
Quick Selection Guide
If the flow is higher than 40 scfm, please choose from the highly energy efficient MVTA models
If the temperature required is above 1100°C please choose the DPF models
When comparing Airtorch heating to other methods please note that the MHI Airtorch systems do not produce any appreciable sound.
Quick Units-Conversionx: (800°C=1472°F) (925°C=1697°F) (1000°C=1832°F), (1100°C=2012°F) (5 Bar=0.5 Mpa)
Need higher temperatures? Please don't hesitate to give us a call or contact us. The kW required depends on the temperature of the exit gas from the Airtorch™ models and the flow volume required. Please use Easy Design Criterion or please use this formula to calculate approximate temperature vs. flow rate for a fixed power for an Airtorch™ model number. MHI also provides flow rate vs. temperature for TA and DPF models. Request Graphs.
Allowed Air/Gas Inputs: Air/Gas from compressor or blower or fan may be attached (varies by model). Some Airtorch models also accept high temperature feed gas as an input. Airtorch™ models are highly efficient electric process heaters (inline, cross line and independently standing models are offered). DPF models have very low pressure drop associated with them. Inputs such as Gas Cylinders, Compressors, Blowers and even fans may be used depending on the model.
Airtorch Operation: The flow rate and temperature are connected. The heater cannot go beyond its rated temperature or power. The thermocouple is integral to the heater.The principle of an air/gas heater is for flowing gas to heat within the residence time of heater/configuration. The flow temperatur ecurve is given on Power Vs Flow Calculator.
Flow Rate is Important: If using a blower or fan the air flow will be controlled by the characteristics of the fan or blower. Fans are employed when the drop in pressure of the system is no greater than approximately 50 in. w.c. (50 in. w.c./inches of H20 is approximately 1.8psi.) This condition remains true even when the fan output large CFM values. Blowers are considered in circumstances where larger pressure drops are present.
For LTA and MTA where the inlet flow is pressure driven, the flow rate is often set by an appropriate SCFM flow meter. Minimum flow rate should be maintained. MHI power controllers can be used to set power.
MVTA, GVTA type Airtorches™ and LTA's may be purchased with several exit configurations which are specific to the model. In addition further manifolding is possible.
Every MHI Airtorch has a maximum power rating, a maximum temperature and a pressure rating (if rated to higher than 1 atmospheric pressure). Please follow the curve on Easy Design Criterion while operating safely within the device ratings. The power should be fixed close to the rated power. Please observe limits with care. Please maintain a low flow cutoff sensor if used close to the highest rated temperature. MHI Airtorch models are provided with multiple control and safety thermocouples and other safety devices.
FAQ?. Whether to use Compressor or Blower?
Ans: The Air torch units accept all inputs. The most important issue is to not fall below the minimum SCFM rating or temperature for the maximum rated power. Fans are employed when the drop in pressure of the system is no greater than approximately 10-50 in. w.c.
|Temperature||Lower Power (1-12 kW)||High Power (36-400 kW)|
|600-900°C||LTA, VTA, MTA925||MVTA-900-(THN) Models|
|High Pressure Enclosures||Up to 900°C|