According to its working principle, a burner can be defined as a device that converts substances into heat through the chemical reaction of combustion - that is, air and fuel are mixed in an appropriate proportion through a premixing device to make it fully burned. The burner is a thermal energy device that feeds fuel and air into the furnace according to the required concentration, velocity, turbulence and mixing mode, and enables the fuel to stably ignite and burn in the furnace. The fuel is mainly fuel oil and gas. Generally used in small and medium oil or gas boilers. Gas burners are divided into natural gas burners, city gas burners, etc.
According to the combustion control mode of the burner, it is divided into: single-stage fire burner, double-stage fire burner, proportional adjustment burner.
According to the fuel atomization method, it is divided into: mechanical atomizing burner, medium atomizing burner;
According to the structure, it is divided into: integral burner and split burner. Among them, the split burner is mainly used in industrial production, and its main feature is that the combustion system, air supply system, control system, etc. are all disassembled and installed. This kind of machine is mainly suitable for large equipment or special working environments such as high temperature.
Relatively speaking, commercial burners are relatively inexpensive due to mass production and low specialization requirements in the market supply chain, while split burners have relatively high specialization requirements, and Most require a professional installation team, and the market sales price is relatively much higher than the same period last year.
The gas burner construction consists of the following 5 systems:
1. Air supply system The function of the air supply system is to send air with a certain wind speed and air volume into the combustion chamber. Its main components are: shell, fan motor, fan impeller, air gun fire pipe, damper controller, damper baffle , Cam adjustment mechanism, diffuser plate.
2. Ignition system
The function of the ignition system is to ignite the mixture of air and fuel, and its main components are: ignition transformer, ignition electrode, electric fire high-voltage cable.
3. Monitoring system
The function of the monitoring system is to ensure the safe and stable operation of the burner, and its main components include a flame monitor, a pressure monitor, and a temperature monitor.
4. Fuel system
The function of the fuel system is to ensure that the burner burns the required fuel. The fuel system of the oil burner mainly includes: oil pipe and joint, oil pump, solenoid valve, nozzle, heavy oil preheater. Gas burners mainly include filters, pressure regulators, solenoid valve groups, ignition solenoid valve groups, and fuel butterfly valves.
5. Electronic control system
The electronic control system is the command center and contact center of the above systems. The main control element is the program controller. Different burners are equipped with different program controllers. The common program controllers are: LFL series, LAL series, LOA series, LGB series , the main difference is that the time of each program step is different.
When the combustible gas (city gas, natural gas, liquefied petroleum gas) is controlled by the microcomputer control system to enter the combustion head of the burner according to the program, the primary air is mixed with the combustible gas, ignited and burned, and the secondary air supports combustion to achieve full combustion. The combustion state is detected and controlled by the flame automatic tracking system. When the combustion fails (oxygen deficiency in the combustion chamber, underpressure of combustible gas, cut-off of combustible gas, insufficient gas volume, etc.), the control system issues an instruction, and the solenoid valve of the gas supply system is quickly closed. , cut off the gas power supply, the burner will automatically shut down after purging, indicating a fault. 1) High thermal efficiency: It can adapt to pressure fluctuations and adjust the primary air distribution by itself (that is, if the gas pressure is large, the primary air is more inhaled; the gas pressure is small, the primary air is inhaled), the combustion is sufficient, and the thermal efficiency is high;
(2) High safety: The burner is equipped with a small fire. When the boiler starts, light a small fire first. When the small fire burns normally and stably, the automatic control system opens the main gas valve, and the fuel can enter the boiler for normal combustion without deflagration;
( 3 ) Strong fuel adaptability: This burner can be used for natural gas, liquefied petroleum gas, coal gas, liquefied petroleum gas mixture and other types of gas only by replacing a few parts
Because the main fuels of gas burners are natural gas, liquefied petroleum gas, city gas and other combustible gases, these fuels are flammable and explosive