Compound furnace profile circulating fluidized bed boiler

Abstract

The invention relates to a compound furnace profile circulating fluidized bed boiler, which comprises a screen-type heating surface, wherein the screen-type heating surface is arranged in a hearth, the upper end of the hearth is connected with an inlet of a separator, the lower end of the separator is connected with a heat exchanger via a stand pipe, the heat exchanger is connected with the hearth via a material return port, a heat exchanger heating surface is arranged in the heat exchanger, a pipe of the heat exchanger heating surface is connected on a header of the heat exchanger heating surface, the end part of the header of the heat exchanger heating surface is connected with one end of a pipeline, the other end of the pipeline is connected with the end part of the lower header of the screen-type heating surface, and the lower header of the screen-type heating surface is connected with the upper header of the screen-type heating surface via the screen-type heating surface. The compound furnace profile circulating fluidized bed boiler fully utilizes the radiation space in the furnace, realizes the optimal distribution of the heat of a circulating loop, the steam temperature and bed temperature adjustment range is wide, which is convenient for the large scale of the circulating fluidized bed boiler, and the invention has the characteristics of durability, easy maintenance and small power consumption.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a composite furnace type circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boiler is a clean coal power generation technology with wide fuel adaptability, large load regulation ratio, and low pollutant emission. At present, the maximum capacity has reached 460MW. With the increase of circulating fluidized bed boiler capacity, widespread There are problems such as limited space in the furnace, insufficient layout of the heating surface and wear of the heating surface in the furnace. According to different furnace types, the currently adopted technical solutions are different. For circulating fluidized bed boilers without external heat exchangers, a large number of overheating panels, reheating panels and water cooling panels are arranged in the furnace to absorb the energy generated by fuel combustion. The released heat; for circulating...

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Problems solved by technology

[0003] Although the method of arranging a large number of superheating panels, reheating panels and water cooling panels in the furnace can solve the problem of heating surface layout, at low load, the steam in the reheating panel does not cool the tube wall enough to easily cause overtemperature phenomenon

However, if a large number of overheating heating surfaces and reheating heating surfaces are arranged in the external heat exchanger, the space is limited, and the tube bundles on the heating surface are relatively dense, and problems such as vibration and local wear are prone to occur during operation, and maintenance is difficult.

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