A Boiler Preventing Contamination and Coking

Abstract

The invention relates to a technology for preventing scorification and dust stratification of a boiler, in particular to a boiler capable of preventing contaminating and coking. The boiler comprises a hearth and a first flue communicated with the hearth, wherein a platen superheater is arranged at the top of the hearth; the first flue is internally provided with a high-temperature reheater and a low-temperature superheater; a horizontal flue is arranged behind the low-temperature superheater; a tail flue is connected behind the horizontal flue; and the boiler is characterized in that the flue wall between the platen superheater and the high-temperature reheater is provided with a nozzle for performing spray cooling on smoke gas. According to the boiler, the nozzle is arranged behind the platen superheater to perform spray cooling on high-temperature smoke gas, so that the heated surface in the flue is cooled to be lower than 700 DEG C, the corrosion to the heated surface of the boiler by alkali metal in the smoke gas is reduced, and safe and economical operation of the boiler is improved. The improved structure is capable of preventing scorification and dust stratification of both boils burning high-alkalinity coal and boilers burning pulverized coal.

Description

technical field [0001] The invention relates to a technology for preventing slagging and ash accumulation in pulverized coal boilers, in particular to a boiler for preventing contamination and coking. Background technique [0002] For coal combustion and utilization, the alkali metal in coal is a harmful component. It is usually related to the slagging and ash accumulation on the high-temperature heating surface of the boiler. Due to the volatilization of alkali metal elements during the combustion process, high-alkaline coal is easy to condense on the heating surface. Forms a layer of primer attachment. With the adsorption of the attachment to the fly ash, the heating surface will be contaminated to varying degrees, and if there is no hair, it will be removed with a soot blower, thereby increasing the heat transfer resistance and reducing the heat transfer efficiency of the heat transfer surface, making the The output of the furnace is greatly reduced, and in severe cases,...

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Problems solved by technology

[0004] In order to solve the serious contamination of high-alkaline coal used in the existing power station boilers, the present invention provides a boiler that prevents contamination and coking. The flue gas at the tail of the boiler is sprayed with water to reduce the temperature of the flue gas and to exchange heat on the heating surface. Directly across the temperature range of 700°C-900°C, which is prone to contamination, avoiding serious contamination of high-temperature superheaters

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