Air-Oil Ratio Regulator for Furnace Burners

Therm process Engineering Pvt. Ltd. manufactures air-oil ratio regulators for oil-fired industrial furnaces. The regulator controls furnace temperature by controlling the oil flow through the burners in step with combustion air. When the temperature controller calls for more or less heat, air and oil change together, keeping the air-fuel ratio correct across the firing range. Therm process ratio regulators suit LDO, HSD, LSHS and furnace oil, at up to 120°C oil temperature and 1.75-2 kg/cm oil inlet pressure.

What Is an Air-Oil Ratio Regulator?

Furnace temperature is controlled by changing the burner firing rate. Changing only the air or only the oil upsets combustion:

• Too much oil for the air: incomplete combustion, smoke, soot and wasted fuel.
• Too much air for the oil: excess air carries heat up the chimney and lowers efficiency.

An air-oil ratio regulator links the two. Combustion air flow, usually set by an air control valve responding to the temperature controller, is sensed by the regulator. The regulator then adjusts oil flow in proportion. Increase air and oil follows; reduce air and oil reduces. Because ratio is held automatically across the range, the burner can modulate between low and high fire while combustion stays correct.

Therm process Ratio Regulator

The Therm process air-oil ratio regulator is used to control furnace temperature by controlling oil flow through the burners. It works with Therm process oil burners, oil micro valves, heating and pumping units, and combustion blowers as part of a complete oil firing system.

It is rated for light and heavy oils. For LSHS and FO, which must be heated to flow, it accepts oil at up to 120°C.

Technical Specifications

Key Features

• Automatic air-oil proportioning.
• Enables modulating temperature control.
• Suitable for LDO, HSD, LSHS and FO.
• Rated for heated heavy oil up to 120 °C.
• Integrates with Therm process oil firing equipment.

Where It Fits in the Oil Firing System

• Temperature controller. Senses furnace temperature and signals a heat demand.
• Air control valve. Adjusts combustion air to the burners.
• Air-oil ratio regulator. Senses the air change and adjusts oil flow in proportion.
• Oil micro valve. Sets the base flow at each burner.
• Burner. Fires at the new rate with the correct ratio.

Applications

• Oil-fired reheating furnaces
• Forging furnaces
• Heat treatment and annealing furnaces on oil
• Dual-fuel systems in oil mode
• Conversion of manual oil firing to automatic temperature control

Benefits

• Stable furnace temperature.
• Correct combustion across the firing range.
• Reduced fuel waste from rich or lean firing.
• Less smoke and soot.
• Reduced dependence on manual adjustment.

Why Choose Thermprocess?

• Combustion system specialists since 1997.
• Complete oil firing train available from one supplier.
• ISO 9001 & ISO 14001 certified, as stated by the company.

Related Therm process Products

• Oil Micro Valve
• Oil and Air Nozzles
• Industrial Burners
• Combustion Blower
• Accessories

Frequently Asked Questions