Detailed Explanation of The Working Principle And Process of The Burner

As a highly automated mechatronic equipment, the burner/burner can be divided into five major systems based on its functions: air supply system, ignition system, monitoring system, fuel system, and electronic control system. These five major systems will not be covered here, but will mainly explain the detailed working process of the burner. Only by understanding the working engineering of the burner can maintenance and troubleshooting be carried out when the burner malfunctions.

Gas burner

Introduction to the working process of the burner/burner

Taking the most complex proportional gas burner as an example, we will explain that its working process has four stages: preparation stage, pre blowing stage, ignition stage, and normal combustion stage.

Gas burner

Preparation stage: After the program controller is powered on, internal program self check begins. At the same time, the servo motor drives the air door to the closed state. After the program self check is completed, it is in standby mode. When the limit switches such as the thermostat, the high/low gas pressure switch, and the steam boiler steam pressure switch allow it, the program controller starts to start and enters the pre purge stage. If the solenoid valve group is equipped with a leak detection system, the system will first perform valve leak detection when allowed by the above limit switch, and only after passing the detection can it enter the pre purge stage.

Pre blowing stage: The servo motor drives the air door to the high fire opening state, and at the same time, the fan motor starts to supply air for 13 seconds to blow in air for pre blowing. Depending on the program controller, after about 20-40 seconds of blowing, the servo motor drives the air door to the ignition opening state, preparing for ignition. Throughout the pre blowing stage, the air pressure switch measures the air pressure. Only when the air pressure is maintained at a sufficiently high level can the pre blowing process continue.

Ignition stage: After the servo motor drives the damper to the ignition open state, the ignition transformer operates and outputs high voltage to the ignition electrode to generate ignition spark. After about 3 seconds, the program controller sends power to the safety solenoid valve and proportional solenoid valve. After the valve is opened, the gas reaches the combustion head, mixes with the air provided by the fan, and is then ignited. Within 2 seconds after the valve is opened, the ionization electrode should detect the presence of flames. Only then can the program controller continue with the subsequent program. Otherwise, the program controller will lock and disconnect the solenoid valve to stop gas supply, and an alarm will sound. (Ignite during motor start time)

Gas burner

Normal combustion stage: After a few seconds of normal ignition and stable combustion, the servo motor drives the air valve to the high fire opening state (the oil pump of the fuel engine starts to spray). At the same time, the servo motor of the proportional gas control valve cuts in and adjusts the gas pressure behind the gas valve based on air pressure and furnace back pressure to adjust the gas volume, achieving stable and efficient combustion. Afterwards, the burner automatically switches between high and low fire and shuts down according to the requirements of each limit switch.

In addition, the ionization electrode and air pressure switch monitor the burner throughout the entire combustion process.