The overall structure of the environmental protection boiler includes two parts: the boiler body and auxiliary equipment. The main components of the boiler, such as the furnace, the drum, the burner, the water wall superheater, the economizer, the air preheater, the frame and the furnace wall, constitute the core part of the steam production, which is called the boiler body. The two most important parts in the boiler body are the furnace and the drum.

The furnace is also called the combustion chamber, which is the space for fuel combustion. Put solid fuel on the grate, and the furnace where the fire bed is burned is called the stratified furnace, also known as the fire bed furnace; the furnace where the liquid, gas or solid fuel is ground into powder, is sprayed into the fire chamber and burned is called the chamber Burning furnace, also known as fire chamber furnace; the air lifts the coal particles to make them burn in a boiling state, and is suitable for burning inferior fuels. The furnace is called fluidized bed furnace, also known as fluidized bed furnace; it uses air flow to make coal particles rotate at a high speed. The cylindrical hearth that burns intensely is called a cyclone furnace.

Environmental protection boiler

The cross section of the furnace is generally square or rectangular. The fuel burns in the furnace to form flames and high-temperature flue gas, so the furnace wall around the furnace is composed of high-temperature resistant materials and thermal insulation materials. Water wall pipes are often laid on the inner surface of the furnace wall, which not only protects the furnace wall from burning, but also absorbs a large amount of radiant heat from flames and high-temperature flue gas.

Furnace design needs to fully consider the characteristics of the fuel used. Each boiler should try to burn the original designed fuel. The economy and reliability of boiler operation may be reduced when environmentally friendly boilers use fuels with large differences in characteristics.

The drum is a cylindrical container that receives feed water from the economizer, connects the circulation loop, and delivers saturated steam to the superheater in the natural circulation and multiple forced circulation boilers. The boiler drum is made of high-quality thick steel plate and is one of the heaviest parts in the boiler.

The main function of the drum is to store water, separate the steam and water, remove the salt water and sludge in the boiler water during operation, and avoid the boiler water with high concentration of salt and impurities from entering the superheater and steam turbine with the steam.

The internal devices of the drum include steam-water separation and steam cleaning devices, water distribution pipes, sewage and chemical dosing equipment, etc. The function of the steam-water separator is to separate the saturated steam and moisture from the water wall, and to minimize the small water droplets carried in the steam. Baffles and gap baffles are commonly used as coarse separation elements for medium and low pressure boilers; in addition to the extensive use of various types of cyclones for coarse separation in boilers above medium pressure, shutters, steel wire mesh or steam equalizing plates are also used for coarse separation. Further separation. The environmental protection boiler drum is also equipped with monitoring and protection facilities such as water level gauges and safety valves.