U-shaped hybrid type radiation boiler

Abstract

The invention discloses a U-shaped hybrid type radiation boiler, comprising a coal-powder boiler and a heat recovery unit, wherein the heat recovery unit comprises a smoke inlet, a radiation heat transfer component, and a convection heat transfer component, the radiation heat transfer component is on the left side of the convection heat transfer component, and the radiation heat transfer component and the convection heat transfer component form a U shape; the radiation heat transfer component comprises a radiation water cooling wall and a radiation screen, the radiation water cooling wall has a cylindrical structure formed by splicing multiple vertical spindly pipes; the radiation screen is positioned in the cylindrical structure of the radiation water cooling wall, and comprises multiple radiation sub-screens which are arranged in a divergent manner by taking the central axis in a vertical direction of the radiation water cooling wall as the center of a circle; the U-shaped hybrid type radiation boiler carries out radiation heat transfer on the high temperature smoke through the radiation water cooling wall and the radiation screen, can make a radiation heat transfer segment cross an easily polluted smoke temperature zone and not condense and adhere on a convection heating surface, fundamentally solves the problems such as coking in a boiler and heating surface faced by a high alkalinity coal generator unit, and realizes pure combustion utilization of the coal with high sodium content.

Description

technical field [0001] The invention relates to the technical field of anti-pollution of high-alkaline coal, in particular to a U-shaped hybrid radiant boiler. Background technique [0002] my country's power generation industry is dominated by thermal power generation, with thermal power installed capacity exceeding 70%. Thermal power coal mostly uses low-quality and low-grade coal. Slagging of boiler furnace water wall and contamination of convective heating surface are one of the important problems that affect the normal operation of power plant boilers for a long time. Slagging and contamination will reduce the heat transfer efficiency of the boiler, affect the output of the boiler, and seriously reduce the operating safety of the equipment. Severe slagging may lead to major accidents such as boiler flameout, tube burst, and unplanned shutdown. [0003] For coal combustion and utilization, the alkali metal in coal is a harmful component. It is usually related to the...

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Problems solved by technology

[0008] The present invention aims at the defects and deficiencies of the high-alkaline coal-fired boiler system in the prior art, and provides a method and boiler device for solving the contamination of the convective heating surface of the boiler, thereby solving the technical problem that the boiler heating surface is not easy to clean, Realize large-scale utilization of domestic high-alkaline coal

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