Sigma Thermal, Inc.
Sigma Thermal - Convection Heater
A convection style heater offers the benefits of a direct-fired heater while eliminating some of the drawbacks associated with radiant heat transfer. Radiant heat transfer can be undesirable in certain temperature-sensitive applications as radiant heat transfer tends to be more intense and unevenly distributed around the coil surface. Sigma Thermal’s convection style direct fired heater utilizes a separate combustion chamber and flue gas recirculation to reduce combustion chamber temperatures to 1,400F, thereby minimizing the impact of radiant heat transfer to the process coil.
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- Row by Row Sizing Method: This detailed sizing method allows for accurate prediction and precise control of heat flux and film temperatures on each individual tube row.
- Coil Configuration Flexibility: Coil flow path and metallurgy are engineered for each customer’s process requirements. Sigma Thermal has extensive experience in process coil design for multi-phase fluids, viscous hydrocarbons, suspended solids, and various gaseous mixtures.
- Fuel Source and Burner Flexibility: Standard or engineered burner configurations are available for use with both traditional and alternative fuel sources. Low emissions burners can be supplied to meet all emission requirements (e.g., Low NOx, Best Available Control Technology).
- Efficiency: Base efficiencies can exceed 90% (LHV Basis) depending on process inlet temperature, and with an optional economizer can exceed 93% (LHV basis).
- Advanced Control Systems: Complete control systems are engineered to optimize system safety and performance. Sigma thermal can supply simple and cost effective standard panels, as well as full process automation and PLC based combustion control / BMS.