Boiler is a kind of energy conversion equipment, the energy input to the boiler are chemical energy in the fuel, electrical energy, boiler output has a certain thermal energy of steam, high temperature water or organic heat carriers.

The original meaning of the pot refers to the water container heated on the fire, the furnace refers to the place where the fuel is burned, the boiler includes two major parts of the pot and furnace. Boiler produced in the hot water or steam can be directly for industrial production and people's lives to provide the required thermal energy, can also be converted to mechanical energy through the steam power plant, or then through the generator will be converted to electrical energy mechanical energy. Provide hot water boiler is called hot water boiler, mainly used for life, industrial production also has a small number of applications. Boilers that produce steam are called steam boilers, often referred to as boilers, and are used in thermal power plants, ships, locomotives and industrial and mining enterprises.

Boiler is a kind of energy conversion equipment, to the boiler input energy in the form of chemical energy in the fuel, electrical energy, high-temperature flue gas heat, etc., and after the boiler conversion, the output of a certain amount of thermal energy to the outside of the steam, high-temperature water or organic heat carriers. Mostly used in thermal power plants, ships, locomotives and industrial and mining enterprises.

The main working principle of the boiler is a use of fuel combustion after the release of heat energy or industrial production in the waste heat transfer to the container of water, so that the water to reach the required temperature or a certain pressure steam thermal equipment. Boiler in the "pot" and "furnace" two parts at the same time, after the water into the boiler, the boiler heating surface in the vapor system will be absorbed in the heat transfer to the water, so that the water heated to a certain temperature and pressure of hot water or generate steam, be led out of the application. In the combustion equipment part, the fuel combustion continues to release heat, combustion of high-temperature flue gas produced by heat propagation, the heat will be transferred to the boiler heated surface, and its own temperature is gradually reduced, and finally discharged by the chimney.