The furnace of pulverized coal boiler is the place where fuel burns. It is surrounded by an evaporative heating surface (water wall), and sometimes there is an array of wall heaters. Furnace is also a place for heat exchange and one of the most important parts of boiler.
The furnace of pulverized coal boiler should not only ensure the complete combustion of fuel, but also reasonably organize the heat exchange in the furnace and arrange appropriate heating surfaces to meet the requirements of boiler capacity, so that when the flue gas reaches the outlet of the furnace, it is cooled to a temperature that allows the subsequent convection heating surfaces to work safely without slagging.
Burner is the main combustion equipment of pulverized coal boiler. Its function is to ensure that fuel and combustion-supporting air can be fully mixed when entering the furnace. Timely ignition and stable combustion.
The air sent into the boiler through the burner is reasonably organized and sent out separately according to the principle of being conducive to ignition and combustion. According to the different functions of air, air can be divided into primary air, secondary air and tertiary air. The primary air is the air that carries the pulverized coal into the burner, the secondary air is the air sent after the pulverized coal is ignited, and the tertiary air is the waste gas of the pulverizing system when the pulverized coal is sent by hot air.
Extended data
Technical features:
(1) Centralized supply of pulverized coal: The pulverized coal is supplied by centralized grinding in the milling plant, and the quality of pulverized coal is stable.
(2) Friendly working environment: the whole system operates in a closed way, with automatic pneumatic conveying for coal supply, centralized ash discharge and no dust escaping.
(3) Simple boiler operation: the system can be started and stopped immediately, and the ignition source is cut off for 30 seconds to enter normal operation; Shutdown can be achieved by cutting off the supply of pulverized coal. The system automatically monitors and adjusts the operation parameters to make the system in the best operation state; At the same time, the interference of labor intensity and human factors on boiler operation is reduced.
(4) High efficiency and energy saving: the pulverized coal is fully burned, and the special pulverized coal boiler has high operating efficiency, saving 30%-50% coal compared with the traditional coal-fired boiler; Equipped with frequency converter for high-power electrical equipment, the power saving effect is obvious.
(5) Clean emission: the pulverized coal burner is designed with air classification and low temperature combustion, and the temperature field is uniform to avoid a large number of nitrogen oxides; Produced by local high-temperature combustion; Flue gas adopts lime desulfurization and bag dust removal, and the pollutant emission concentration is low; Fly ash is discharged through a closed system without secondary pollution.
(6) Land saving: there is no coal yard and slag yard in the boiler room, which covers a small area.
(7) High cost performance: low operating cost, saving coal, and recovering equipment investment in a short time.
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