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It is the main indicator of boiler performance, including boiler capacity, steam pressure, steam temperature, feed water temperature, etc. The boiler capacity can be expressed by the rated evaporation or the maximum continuous evaporation. Rated evaporation is the amount of steam continuously produced per unit time at a specified outlet pressure, temperature and efficiency. The maximum continuous evaporation is the maximum amount of steam that can be continuously produced per unit time at a specified outlet pressure and temperature.
Steam parameter
Including the steam pressure and temperature of the boiler, usually refers to the superheated steam pressure and temperature at the superheater, reheater outlet, such as without superheater and reheater, that is, the saturated steam pressure and temperature at the boiler outlet. 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.
Natural circulation boiler 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 use; according to the boiler outlet pressure, they can be divided into low-pressure, medium-pressure, high-pressure, ultra-high pressure, subcritical pressure, supercritical pressure boilers, etc. The flow path of flue gas can be divided into fire tube boiler, fire tube boiler and water tube boiler, wherein fire tube boiler and fire tube boiler are collectively referred to as shell boiler; according to circulation mode, it can be divided into natural circulation boiler and auxiliary circulation boiler (ie forced circulation) Boiler), DC boiler and compound circulating boiler; according to the combustion mode, the boiler is divided into chamber burning furnace, layer burning furnace and boiling furnace.
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 pipe, and is further heated and sent to the drum, mixed with the pot water, and then descends along the down pipe 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, and reaches the drum through the riser tube, and the water and steam are separated by the steam-water separation device. The separated saturated steam flows from the upper part of the drum to the superheater, and continues to absorb heat to become a superheated steam of a certain temperature (currently, the steam temperature of most 300MW and 600MW units is about 540 °C), and then sent to the steam turbine.
Combustion and flue gas system
In terms of combustion and flue gas systems, the blower sends air to the air preheater to a certain temperature. The pulverized coal that has been ground to a certain degree in the coal mill is carried by the hot air from the air preheater through the burner into the furnace. The mixture of pulverized coal and air ejected from the burner is mixed with the rest of the hot air in the furnace to burn a large amount of heat. The hot flue gas after combustion flows through the furnace, the condensate tube bundle, the superheater, the economizer and the air preheater, and then passes through the dust removing device to remove the fly ash, and finally is sent to the chimney by the induced draft fan to discharge to the atmosphere.
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