Burners for infrared baking

Burners for Direct Gas Fired Ovens

DGF oven burners use a “zero pressure” gas system. The burners ignite and burn a gas/air mixture. The gas is supplied to the gas/air mixer unit at nominally zero pressure. The air is supplied at a positive, controlled pressure. An increase in air pressure increases the flame and the heat input to the baking chamber. The gas may be natural gas, town gas (manufactured from coal), or LPG (liquid petroleum gas).

Gas train

Mains gas is supplied from a factory system to the oven where it is regulated by a “gas train”. This consists of the following equipment:

Manual shut off valve
Two – automatic shut off valves for safety the system
Gas filter
Zero pressure gas governor
Gas pressure high/low detection
Gas pressure gauges (2) at gas inlet and outlet of gas train
Gas valve tightness proving facility (to check for a leakage of gas)
Main gas pipes and gas distribution system
The gas is fed to header pipes running along each zone of the oven at the top and bottom. The headers are connected to each burner by flexible hoses and via a solenoid valve and gas/air mixer.

Combustion air

In each zone the air is fed to the air header pipes from an air blower mounted on top of the oven. The air is drawn from the bakery and is filtered. The air pressure for the burner system is controlled by motorized valves which are regulated by the automatic temperature control system or by a variable speed inverter drive for the fan.

Moro Combustion air fan mounted on top of a DGF oven

Eratec MFB burners

MFB burners (metal-fiber burners)

Eratec high rate infra-red ribbon burners for Direct Gas Fired Ovens

Direct heat transfer by radiation (without contact and air movement)
High radiant power density 100 – 1000KW/m2
Precise control and power modulation
Energy consumption savings compared to conventional Direct Gas Fired Burners (up to 20% saving depending on the oven and number of burners)
Low pollution (up to 80% less CO and NOX)
Safe for people and equipment (no burn back)
Low maintenance

Baker Pacific Direct Gas Fired oven with Eratec burners

www.era-tec.fr

Flynn Burner Corporation

Flynn burner direct gas fired installation

Stainless steel corrugated ribbon

Flynn distributor burner for multi-lane flame control

Baker Pacific Direct Gas Fired oven with Flynn burners

www.flynnburner.com

Burners for indirect fired ovens

Each oven zone has one burner firing into a burner tube connected to a heat exchanger system. The hot air and burnt gas circulates in the heat exchanger and does not enter the baking chamber. Fuel may be gas or diesel oil. Burners may be specifies for either fuel or dual fuel.

MAX Weishaupt GmbH

Weishaupt natural gas burner installation on a Baker Pacific Indirect Radiant oven

Technical description

The Weishaupt WG burner is a forced draught gas burner. For biscuit oven applications, the burner should always be a fully modulating type. The burner comprises the following features:

Combustion manager

Microprocessor control and monitoring of all burner functions
LCD display
Keypad operation
Data bus connection
Integrated valve proving of the solenoid valves

Flame sensor

Monitors the flame during operation. If a problem occurs, a safety lockout will operate.

Double solenoid valve

Gas pressure governor. Controlled pressure is set by an adjusting screw
Air/gas ratio control provides optimization over control range
2 solenoid (Class A) valves
Gas filter

Low gas pressure switch

Gas pressure switch for automatic valve proving

Air pressure switch

Loss of combustion air pressure activates a safety shut down

Picture courtesy of Max Weishaupt GmbH

Weishaupt gas train

Specification: Weishaupt burner WG30N/1-C ZM LN

(for 1.25m wide Indirect Radiant Oven) Version: modulating via 3 term switching and Buyer’s PID controller

Fuel: natural gas
Gas pressure: 30mbar
Rating capacity: 40-350kW
Electro motor: 1ph, 0.42kW, 230V, 50Hz
Combustion manager: Siemens Type W-FM20
Flame monitor
Continuous running fan
Gas valve train size 1”
Double Magnetic Valve (DMV)
Gas pressure switch
Gas pressure regulator assembly with safety valve
Gas pressure inlet: (max.) 2.5 bar
Gas pressure outlet: 20 mbar
Gas filter
Gas ball valve
Fitting, reducing and sealing parts

Weishaupt burners- features:

The digital combustion management system ensures that only exactly the amount of energy is consumed that is needed at the time.
Weishaupt Low NOx technology (standard for gas burners, optional for oil burners) is exemplary in reducing emissions with special mixing assemblies for intensive flue gas recirculation
All W range burners work fully automatically. Powerful microprocessors continuously control and monitor the combustion process for maximum efficiency.
The transversely mounted fan draws air through a sound attenuated inlet.
The W range offers oil and gas burners in five ratings from 12 kW to 570 kW.
More than 50 years of experience and development work have gone into Weishaupt burner technology. Only the best materials are used.