A system for alleviating slagging on convection heating surface of boiler

Abstract

The invention relates to a technology for relieving scorification of a convection heated surface of a boiler, in particular to a system for relieving scorification of the convection heated surface of a boiler. The system comprises a crust block machine arranged in a flue of a boiler, wherein the crust block machine is positioned at the front end of the windward side of a convection superheater at the top of the flue; the crust block machine comprises two symmetrically arranged disks and a straight pipe fixedly arranged between the two disks; and the crust block machine can roll in the axial direction of the flue. The crust block machine is applicable to various boilers using high-alkali metal content coal; scorification can be made in advance; safe operation of the convection heated surface is ensured; the operation time of the boiler is increased; offset of smoke temperature at a hearth outlet and uneven flow field caused by combustion of a quadrangle tangent circle boiler are reduced by the arrangement of the crust block machine; frequent explosion of the convection superheater and the reheater is avoided; normal operation of the boiler is not affected in the process of slag removal and scorification cleaning; the operation time of the boiler is prolonged; and the economical efficiency of a power plant is improved.

Description

technical field [0001] The invention relates to a technology for reducing slagging on the convective heating surface of a boiler, in particular to a π-type boiler capable of preventing slagging on the convective heating surface. 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. The slagging of the boiler furnace water wall, slagging and contamination of the 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 furnace flameout, tube burst, and unplanned shutdown. [0003] In order to prevent va...

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Problems solved by technology

[0006] In order to solve the slagging problem existing on the convective heating surface of the existing power station boiler, the present invention provides a system for alleviating the slagging on the convective heating surface of the boiler, which can greatly reduce the slagging and contamination phenomenon on the convective heating surface of the existing power station boiler, and stabilize the output of the boiler , reduce the corrosion and wear of the convection heating surface, and can also solve the problem of cleaning the slagging on the convection heating surface of the existing power plant boiler. Flue temperature deviation produced by the boiler

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