Rotating nozzle structure of RP coal mill

Abstract

The invention relates to a rotating nozzle structure of a RP coal mill. The rotating nozzle structure comprises a coal mill side mill body, a grinding bowl and a separator liner plate, wherein a gap formed between the grinding bowl and the separator liner plate can form a ventilating nozzle; an impeller which is fixed on the coal mill side mill body in a screwing manner is arranged between the grinding bowl and the separator liner plate, one side, which is close to impeller, of the grinding bowl is fixedly provided with a coal blocking ring in the screwing manner, and a first throttling ring is arranged above the impeller and is positioned on one side of the separator liner plate; an adjusting cover is arranged below the separator liner plate by an interval, and the adjusting cover and an outer ring of the impeller are welded and fixed. The rotating nozzle structure provided by the invention has the advantages of being capable of being used in an industry coal pulverizing system, an air power filed of primary hot air flowing the nozzle is changed, the flowing speed of the nozzle is increased, the abrasion of an air outlet edge of a blade, the primary wind resistance and the deslagging amount of pebble coal are reduced, the powder producing effect is improved, the unit energy consumption for powder production is reduced, the structure is simple, the installation is easy, and the overhaul is convenient.

Description

technical field [0001] The invention relates to the technical field of RP coal mills, in particular to a rotary nozzle structure of RP coal mills. Background technique [0002] In the known technical field, the RP coal mill is developed on the basis of the traditional bowl coal mill and is a shallow bowl mill. It adopts conical grinding rollers and needs air sealing to prevent hot air and coal powder from escaping and polluting the gearbox and grinding roller bearings, but it does not require a powder discharger. For negative pressure powder system. Small RP type coal mills use springs to pressurize the grinding rollers, and large RP type coal mills use hydraulic-pneumatic loading devices. The grinding roller is independently installed on the top of the grinding disc. There is a certain gap between the grinding roller and the grinding disc, and there is no direct contact. It adjusts the final fineness of the pulverized coal by adjusting the angle of the pulverized coal sep...

AI Technical Summary

Problems solved by technology

When the power plant uses static nozzles, the airflow conditions of the primary wind at the static nozzles are not consistent with the airflow conditions in the coal mill, resulting in abnormal wear of the nozzles and reducing the life of the nozzles; The wind speed is low, the pulverization efficiency is low, the unit consumption of pulverization is high, and the amount of pebble coal is large, which directly affects the normal operation of the coal grinding system, making the coal pulverizer economical and energy-saving.

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