Steam system

Including the steam pressure and temperature of the boiler, it usually refers to the superheated steam pressure and temperature at the outlet of the superheater and reheater. If there is no superheater and reheater, it refers to the saturated steam pressure and temperature at the outlet of the boiler. The feed water temperature refers to the inlet water temperature of the economizer. When there is no economizer, it refers to the inlet water temperature of the drum. Boilers can be classified according to different methods. Boilers can be divided into industrial boilers, power station boilers, marine boilers and locomotive boilers according to their purpose; according to the outlet pressure of the boiler, they can be divided into low pressure, medium pressure, high pressure, ultra high pressure, subcritical pressure, supercritical pressure and other boilers; The flow path of flue gas can be divided into fire tube boilers, fire tube boilers and water tube boilers. The fire tube boilers and fire tube boilers are also called shell boilers. According to the circulation mode, they can be divided into natural circulation boilers and auxiliary circulation boilers (ie forced circulation). Boilers), once-through boilers and combined circulation boilers; according to the combustion method, boilers are divided into chamber-fired furnaces, layer-fired furnaces and boiling furnaces.

Water vapor system

In the water vapor system, after the feed water is heated to a certain temperature in the heater, it enters the economizer through the water supply pipeline, and is further heated and then sent to the drum, mixed with the boiler water, and then descends to the water wall inlet header. The water absorbs the radiant heat of the furnace in the water wall tube to form a steam-water mixture through the rising pipe to reach the drum, and the steam-water separation device separates the water and steam. The separated saturated steam flows from the upper part of the drum to the superheater, and continues to absorb heat to become superheated steam of a certain temperature (mostly 300MW and 600MW units steam temperature is about 540℃), and then sent to the steam turbine.

Smoke and wind system

In the combustion and flue gas system, the blower sends air into the air preheater to heat it to a certain temperature. The pulverized coal, which is ground to a certain fineness in the coal mill, is carried by a part of the hot air from the air preheater and injected into the furnace through the burner. The pulverized coal and air mixture sprayed by the burner is mixed and burned with the rest of the hot air in the furnace, releasing a lot of heat. After burning, the hot flue gas flows through the furnace, slag tube bundle, superheater, economizer and air preheater in sequence, and then passes through the dust removal device to remove the fly ash, and finally is sent to the chimney by the induced draft fan to be discharged to the atmosphere .