The main working principle of the oil-gas boiler is a thermal equipment that uses the heat released after the combustion of fuel or the waste heat from industrial production to transfer to the water in the container, so that the water reaches the required temperature or a certain pressure of steam. The boiler is carried out in two parts of the "boiler" and "furnace" at the same time. After the water enters the boiler, the heating surface of the boiler in the steam-water system transfers the absorbed heat to the water, so that the water is heated to a certain temperature and pressure of hot water or steam, which is led out application. In the combustion equipment part, the combustion of fuel continuously releases heat, and the high-temperature flue gas produced by combustion transfers the heat to the heating surface of the boiler through heat transmission, and the temperature of itself gradually decreases, and then it is discharged from the chimney.