Vertical type coal dust corner tube boiler

Abstract

The invention discloses a vertical type coal dust corner tube boiler which comprises a burner, a boiler furnace, a high temperature air preheater, a coal economizer, a low temperature air preheater convection tube bundle, an upper collecting box, a top collecting box, a boiler barrel and a lower collecting box. The lower collecting box is arranged at the bottom of a boiler body, and the upper collecting box and the top collecting box are arranged at the top of the boiler body and are communicated through a vapor communicating pipe. The vertical type coal dust corner tube boiler is characterized in that the burner is arranged at the top of the boiler body, the boiler body is of a vertical type tubular membrane type water-cooled wall structure, four down pipes are arranged at four corners, and the down pipes and two ends of the membrane type water-cooled wall are communicated with the upper collecting box and the lower collecting box respectively. The convection tube bundle is arranged on the outer side of the membrane type water-cooled wall, the bottom of the convection tube bundle is communicated with a hearth smoke outlet, and the top of the convection tube bundle is communicated with the high temperature air preheater. The vertical type coal dust corner tube boiler has the advantages that an integral structure is compact, the appearance is arranged simply, an occupied area is small, steel consumption is small, water circulating differential pressure of the boiler is large, and water circulation is safe and reliable, and the like.

Description

technical field [0001] The invention belongs to the field of coal-fired industrial boilers, and in particular relates to a vertical pulverized coal corner tube boiler which uses coal powder, urban sludge, and biomass as fuel for generating steam. Background technique [0002] my country's energy structure is dominated by coal. For a long time in the future, coal-fired industrial boilers will still be the leading product of industrial boilers. [0003] The traditional industrial coal-fired boilers are mainly layer-fired boilers. The disadvantages are low combustion efficiency and serious pollution, which makes it difficult to meet the requirements of energy saving, emission reduction and pollutant discharge. [0004] Pulverized coal combustion is one of the efficient and clean combustion methods of coal, and its combustion efficiency can reach more than 96%. It is a mature combustion technology and is widely used in large-scale power plant boilers. In recent years, pulverize...

AI Technical Summary

Problems solved by technology

[0005] 1) The combustion is not uniform enough, and the temperature difference between front and back is relatively large, which is not conducive to reducing NO X Content

[0006] 2) The load adjustment range is small, only a single fuel - pulverized coal can be used

[0007] 3) Boiler ash and slag cleaning is inconvenient

[0008] 4) The boiler room occupies a large area

[0009] 5) The bottom of the furnace is easy to coke

[0010] 6) It is difficult to overhaul the burner

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