Platen superheater system

Abstract

The invention discloses a platen superheater system. The system involves an inlet header, a plurality of U-shaped tube platens and an outlet header; each of the inlet header and the outlet header comprises a large header body and a plurality of small header body arranged on the large header body; the plurality of U-shaped tube platens are arranged in the boiler width direction of a boiler, each U-shaped tube platen comprises a front-row tube platen body and a rear-row tube platen body which are arranged in parallel in the boiler depth direction of the boiler, and the front-row tube platen bodyand the rear-row tube platen body of each U-shaped tube platen are connected with the same inlet small header body and the same outlet small header body respectively; and the inlet header and the outlet header are arranged up and down in the height direction, and the inlet large header bodies and the outlet large header bodies are arranged on the same side of the U-shaped tube platens. Accordingto the system, by optimizing the arrangement positions of large header bodies of an existing platen superheater and optimizing the flowing directions of working media in inlet small header bodies andoutlet small header bodies, the differential pressure deviation of all pipes of the front-row pipe platen bodies and the rear-row pipe platen bodies in the inlet small header bodies and the outlet small header bodies is smaller, the working medium flow is more uniform, and the purpose of reducing large systematic deviation existing in working medium side outlet wall temperature is achieved.

Description

technical field [0001] The invention relates to the technical field of boiler design, more specifically, relates to a panel superheater system capable of reducing wall temperature deviation and preventing wall temperature overheating. Background technique [0002] The thermal deviation of the heating surface of the boiler mainly depends on the non-uniform coefficient of heat load on the heating surface, the coefficient of structural non-uniformity and the coefficient of flow non-uniformity. The panel superheaters of the existing supercritical pulverized coal boilers are arranged above the furnace, and the number along the width of the furnace is mostly Panel, a panel is arranged along the depth direction of the furnace, including the front and rear row of tube panels. The headers are parallel to the front and rear walls of the boiler, the small headers are vertically installed on the large headers, and the inlet and outlet headers are arranged up and down along the height di...

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Problems solved by technology

[0004] After analysis, the main reason is: affected by the flow direction and flow rate of the working fluid in the small header, the static pressure distribution in the inlet and outlet headers is different, so that the front and rear tube panels correspond to the pressure difference deviation of the inlet and outlet headers Larger, the pressure difference between the inlet and outlet small headers of the front row of tube panels is large, and the pressure difference between the inlet and outlet of the rear tube panels is small, resulting in low flow of working fluid in the rear row of tube panels and a large coefficient of flow non-uniformity, resulting in wall temperature large deviation

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