Field heat treatment high-velocity combustion systems consist of a Gas / Valve Train, High-Velocity Burner, high volume pressure Blower, and interconnecting control cabling, flexible gas hoses, and air ducts.
These field heat treatment high-velocity combustion systems are for a variety of Field Heat Treatment applications. From relatively low-temperature epoxy cures of large petrochemical storage tanks to high-temperature PWHT stress reliefs within small temporary furnaces and In-situ PWHT of large multi-story petrochemical towers to refractory dry-outs and molten metal foundry and glass furnace start-up applications.
These HV Combustion systems are dual-fuel for Natural Gas or Liquid Propane. Vaporizers are required when using propane to ensure the proper flow rate.
A Gas / Valvetrain is an assembly of piping, control and safety valves, and a flame safety system that is needed to safely control the pressure and flow rates of fuel to the High-Velocity Burner and monitor flame safety. Per the National Fire Protection Association (NFPA) and the American and Canadian Gas Association guidelines.
Safety-interlocked pressure, flow, and flame control components ensure that the system operates safely and feedback to the Combustion Technician during equipment start-up and operation.
Portable gas trains are in wheeled cabinets and available in various sizes and BTU capacities. An automatic gas train utilizes a closed-loop microprocessor temperature controller. In contrast, a manual gas train requires operator interaction. It is best suited for such thermal processes as refractory dry-outs and furnace stress reliefs, where an array of thermocouples is needed to affirm temperature uniformity.
All burners develop high-velocity, low-luminescent flames varying in length from 3- to 8-ft long and 6- to 15-inches in diameter, depending on burner size and thermal power capacity. Due to the 100% turndown ratio available on the gas trains, there are typically only four-burner sizes required for most applications, with thermal power capacities of 1, 3, 6, and 10 MBtu/hr—equipment with ultraviolet flame sensors and remote ignition transformers.
High-velocity burners utilize high-volume, pressure blowers for combustion air to enhance turbulence and convective heat transfer. Most applications are lean or excess-air operation instead of stoichiometric or fuel-rich operation. Consequently, the products of combustion are minimized and diluted.
Typically for a 10 MBtu/hr Burner, a 2,200-scfm (standard cubic feet/min) blower, capable of creating static pressure of 24 in. WC (inches of water column), powered by a 15-HP 3-phase electric motor is used. Each blower consists of a motor, starter, control panel, airflow control valve, and air pressure switch.
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