Water-cooled wall of boiler with double collecting boxes at middle part

Abstract

The invention relates to a water-cooled wall of a boiler with double collecting boxes at the middle part, relating to a water-cooled wall of the boiler. The water-cooled wall is vertically arranged, and the double collecting boxes are arranged at the middle part of the boiler and consist of a distribution collecting box and a mixing collecting box. A working medium enters the mixing collecting box of the lower part of the boiler after flowing out of a water-cooled wall pipe of a lower hearth and then enters the distribution collecting box of the upper part of the boiler through a connection main pipe, the distribution collecting tank is used for distributing the working medium to a water-cooled wall of an upper hearth, and the mixing collecting box and the distribution collecting box are connected through the connection main pipe in a crossing manner. According to the water-cooled wall of the boiler, disclosed by the invention, the working medium absorbing much heat from the lower hearth is distributed to the wall-cooled wall pipe with lower thermal load in the upper hearth, thus the temperature deviation of the working mediums at outlets of water-cooled walls in width and depth directions of a hearth is effectively reduced, and the safety of boiler hydrodynamics is ensured.

Description

technical field [0001] The invention relates to a boiler water wall, which belongs to the technical field of combustion equipment. Background technique [0002] In pulverized coal boilers, no matter whether four-corner tangential combustion, double tangential combustion, front and rear walls are opposed to combustion or "W" flame combustion, there is always an uneven heat load inside the furnace. For subcritical boilers, even if the heat load is unevenly distributed, the working medium in the water wall is saturated, so there is no temperature deviation at the outlet of the water wall. However, for supercritical pulverized coal boilers, the temperature of the working fluid in the water-cooled wall gradually increases along the furnace height, and at the same time, the larger furnace width and depth of the large-capacity supercritical boiler also lead to more serious heat load inhomogeneity, so the outlet of the water-cooled wall Larger temperature deviations are prone to oc...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a water-cooled wall with double headers in the middle of the boiler to solve the problem of uneven temperature distribution in the riser pipe of the vertical water-cooled wall

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