Direct blowing type coal pulverizing system with anti-slagging function

Abstract

The direct blowing type coal pulverizing system with the anti-slagging function comprises a coal feeder, a coal mill, a powder pipe, an additive unit and a control unit, a stock bin of the additive unit and the feeder are used for conveying an additive for increasing the melting point to the coal mill, and therefore the additive and raw coal are ground, dried and mixed together in the coal mill; mixing is more sufficient, uniformity is better, and the prepared air-coal mixture is higher in melting point and not prone to slag bonding due to the fact that the additive is doped; a coal quantity sensor and a coal quality sensor of the control unit are used for detecting coal quantity and coal quality data entering the coal mill, and a controller of the control unit adjusts the rotating speed of the feeder according to the data, so that an additive entering the coal mill can be matched with raw coal, the addition amount is controlled to be an optimal value, the influence on boiler combustion is reduced, and the operation energy consumption of the system is reduced; the system is simple in structure, short in transformation construction period and stable and reliable in use, the system can be cut off at any time when additives are not needed, and normal operation of the boiler is not affected.

Description

technical field [0001] The invention belongs to the technical field of pulverization by a pulverized coal boiler, in particular to a direct-blown pulverization system with the function of preventing slagging. Background technique [0002] The direct-blown pulverization system is an important part of the pulverized coal boiler combustion system. It is mainly used to prepare pulverized coal with a fineness that meets the requirements and provide air with a suitable temperature for transportation so as to form the air-powder mixture required by the boiler. Direct blowing Due to the characteristics of simple structure, quick start, flexible adjustment, low unit consumption of pulverization, compact structure, small footprint, and small unit investment, the conventional pulverizing system is widely used in the pulverized coal boiler combustion system of large thermal power units. [0003] Slagging refers to the process in which the high-temperature flue gas in the boiler carries ...

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Problems solved by technology

[0005] At present, due to the large deviation between the type of coal used and the designed type of coal, defects in the boiler structure design, and improper operation of large-scale power station coal-fired boilers, serious slagging of the water-cooled wall of the furnace and the high-temperature heated wall surface has resulted in serious slagging of the boiler thermal efficiency and coal consumption. When the slagging is particularly serious, the falling of large slagging blocks will also cause violent fluctuations in the negative pressure in the furnace, causing fire extinguishing accidents in the furnace, affecting the safe operation of the unit, and slagging will also change direction and promote high temperature. Corrosion will greatly reduce the service life of the boiler

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