L-shaped radiation boiler capable of reducing high-alkalinity coal combustion contamination

Abstract

The invention discloses an L-shaped radiation boiler capable of reducing high-alkalinity coal combustion contamination. The L-shaped radiation boiler capable of reducing the high-alkalinity coal combustion contamination comprises a combustion hearth and a radiation hearth, and the combustion hearth is connected with the radiation hearth through a horizontal flue; a film type radiation re-heater and a beam-shaped radiation screen are arranged in the radiation boiler; the film type radiation re-heater is barrel-shaped and composed of a plurality of vertical elongated pipes in a splicing mode, and the inside of the barrel is a cavity; the beam-shaped radiation screen is located in the cavity of the film type radiation re-heater, the beam-shaped radiation screen comprises a plurality of vertical plane radiation sub-screens, each radiation sub-screen is composed of a plurality of vertical elongated pipes in a splicing mode, and the radiation sub-screens are distributed in a diverging mode through using the central axial line of the film type radiation re-heater in the vertical direction as the circle center. According to the L-shaped radiation boiler capable of reducing the high-alkalinity coal combustion contamination, by means of the radiation heat exchange of the film type radiation re-heater and beam-shaped radiation screen for the high-temperature flue gas, the radiation heat exchange section can cross the easily contaminated flue temperature zone, the flue gas would not condense on and adhere to the convection heating surface, and the problems of coking in furnace, heating surface contamination and the like of a high-alkalinity coal generator set are radically solved.

Description

technical field [0001] The invention relates to the technical field of anti-pollution of high-alkaline coal, in particular to an L-shaped radiant boiler for reducing the pollution of high-alkaline coal combustion. 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 and contamination may lead to major accidents such as boiler flameout, tube burst, and unplanned shutdown. [0003] In order to prevent various problems caused by...

AI Technical Summary

Problems solved by technology

The proportion of high-alkaline coal fired in the boiler should not exceed 30%. When the proportion of mixed fired coal increases, the convective heating surface will be seriously contaminated and ash will form a flue gas corridor, and the flue gas will cause leakage of the high-temperature reheater and high-temperature superheater.

Since high-alkaline coal is mostly used in pithead power stations in Xinjiang, the demand for coal blended with foreign coal is large. This method is often limited by transportation conditions, which greatly increases operating costs.

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