Exhaust gas extraction system of medium speed coal mill

Abstract

The utility model relates to a medium-speed coal mill exhaust gas extraction system, which belongs to the medium-speed coal mill exhaust air extraction system. Five evenly distributed primary air pipes are fixedly connected to the outlet separator of the medium-speed coal mill, and one of the primary air pipes is connected to the bag filter, which is also connected to the induced draft fan, and the bottom of the bag filter is connected to the powder bin Connection, four powder feeders are respectively connected under the powder bin, and the other four of the five primary air ducts are respectively fixedly connected with continuous curve-type shrinkage cavity devices, and the powder feeder is respectively connected to the other four primary air pipes through the pipeline. The air duct is connected, and the other four primary air ducts are connected with the furnace. The advantage is that the structure is novel, the flexibility is high, and the exhaust gas extraction volume can be adjusted; the distribution is more accurate, combined with the online device of pulverized coal concentration, it can precisely control the speed of redistribution to the pulverizer, and redistribute coal pulverized to the pulverized pipes with different concentrations. Distribution, which is an effect that traditional distribution techniques cannot achieve.

Description

technical field [0001] The invention belongs to a medium-speed coal pulverizer exhaust gas extraction system. Background technique [0002] At present, a large number of new large-scale boilers in our province are equipped with medium-speed coal pulverizer direct blowing pulverization system, and one coal pulverizer supplies the pulverized coal required for combustion by 4 or 5 burners. After being put into production, the uneven distribution of pulverized coal to 4 or 5 burners supplied by the same coal mill often leads to abnormal combustion in the boiler furnace, which manifests as burner coking or burnout, and the serious deflection of the furnace flame leads to boiler coking reduction. Load operation, NOx at the furnace outlet cannot reach the design level, high content of fly ash and large slag combustibles, etc., which seriously affect the safe and economical operation of the boiler. Contents of the invention [0003] The invention provides a medium-speed coal pulv...

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Problems solved by technology

[0003] The invention provides a medium-speed pulverizer exhaust air extraction system to solve the problem of abnormal combustion in the boiler furnace due to uneven distribution of coal powder

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