Circulating fluidized bed boiler having water cooling reinforcement structure

Abstract

The invention provides a circulating fluidized bed boiler. The circulating fluidized bed boiler comprises a hearth and a water cooling column, wherein the water cooling column is arranged in the hearth and is formed through enclosing a plurality of column membrane water cooling walls, an angle is formed between adjacent column membrane water cooling walls, the outside of the water cooling column at the corner of the adjacent column membrane water cooling walls of the plurality of column membrane water cooling walls is provided with at least one reinforcement wall formed by water cooling tubes and extending out of the whole height of the water cooling column, and the reinforcement wall protrudes toward the inside of the hearth from the water cooling column. A structure for increasing the strength of the circulating fluidized bed water cooling column is provided through utilizing the above technical scheme of the invention. The structure has the advantages of no occupying of the space in the column, increase of the strength of the hearth water cooling column, guarantee of the safe running of the water cooling column, and reduction of unfavorable influences to the combustion of a hearth fuel as possible.

Description

technical field [0001] The invention relates to the technical field of large-scale circulating fluidized bed boilers, in particular to a strengthening structure of a furnace water cooling column of a circulating fluidized bed boiler. Background technique [0002] Large-scale is an inevitable trend in the development of circulating fluidized bed boilers. As the capacity of circulating fluidized bed boilers increases, the heat release volume of the furnace increases faster than the evaporation heating surface in the furnace, and the unbalanced growth of heat release and heat absorption Lead to layout problems of the heating surface. At the same time, as the depth of the furnace increases, it is difficult to increase the penetration depth of the secondary air simultaneously, which is also a major problem in the large-scale process. [0003] In order to simultaneously solve the problem of the layout of the heating surface and the penetration of the secondary air in the process ...

AI Technical Summary

Problems solved by technology

However, because the temperature of the water-cooled tube wall is much lower than the average temperature of the furnace, before adding these water-cooled tubes, the temperature in a thin layer close to the water-cooled wall is relatively low; after adding these water-cooled tubes, the cooling wall is too concentrated, and the temperature is low Greatly expanded, after the fuel enters these areas, it is easy to continue to burn due to a sudden drop in temperature, which will lead to a reduction in the combustion efficiency of the boiler

Images