Intermediate storage bin type multifunctional powder feeding system for steel ball coal mill

Abstract

The steel ball coal mill intermediate storage warehouse type multifunctional powder feeding system of the present invention includes a primary fan, a blower fan, an air preheater, a coal feeder, a coal mill, a coarse powder separator, a fine powder separator, a powder bin, and a powder discharger. Fans, primary air boxes, exhaust air boxes, air-powder mixers, high-speed OFA nozzles, main burners and boilers, etc., which are based on the intermediate storage warehouse-type steel ball mill hot air powder feeding pulverization system. The exhaust gas is led to the vicinity of the primary air hot air through the exhaust air transfer pipeline and is paralleled with the primary air box to form an exhaust air bellows. The exhaust air is sent into the hot air pipeline through the exhaust air branch pipe, and the exhaust air and hot air are mixed and mixed with coal powder through the air powder mixer. Finally, the pulverized coal is transported, which can effectively adjust the temperature of the primary air-powder mixture. The multifunctional powder feeding system of the present invention can not only meet the fire stability requirements of anthracite and lean coal, but also meet the combustion and explosion protection requirements of bituminous coal transportation.

Description

Technical field: [0001] The invention belongs to the field of coal pulverized boiler pulverization system field of power station, and in particular relates to a steel ball coal mill intermediate storage bin-type multifunctional powder feeding system. Background technique: [0002] The pulverizing system is an important part of the combustion system of the pulverized coal boiler in the power station. Its main function is to prepare and transport pulverized coal to provide the boiler with a mixture of pulverized coal of qualified fineness and air powder at a suitable temperature. Pulverized coal boilers can be divided into lean coal anthracite boilers and bituminous coal boilers according to different fuel properties. The pulverization system is selected according to the design coal type. Usually, a pulverization system is only suitable for one type of coal. The conventional intermediate storage bin-type steel ball coal mill system is reliable in operation and has strong adapt...

AI Technical Summary

Problems solved by technology

The conventional intermediate storage bin-type steel ball coal mill system is reliable in operation and has strong adaptability to coal types. It can grind anthracite, lean coal, and bituminous coal. Lean coal anthracite boilers usually choose hot air with a higher temperature of the primary air powder mixture. Powder feeding method, bituminous coal boilers generally choose the exhaust air powder feeding method with a lower temperature of the primary air powder mixture; once the powder feeding method is selected, it will only be applicable to one type of coal, single lean coal anthracite or single bituminous coal, and cannot At the same time, the scope of application of coal types is greatly limited

[0003] Whether it is the hot air powder feeding method or the exhaust gas powder feeding method, it can only be adapted to the grinding and transportation of lean coal anthracite or bituminous coal, and cannot take into account both

In today's coal market with complex changes and frequent fluctuations in coal prices, there is often a large gap between the prices of bituminous coal and lean coal anthracite, and the fluctuations are relatively large. impact on coal procurement economics and fuel supply security for power plants

Images