Boiler system for relieving coking slagging and high-temperature corrosion of water wall

Abstract

The invention discloses a boiler system for relieving coking slagging and high-temperature corrosion of a water wall. The boiler system comprises a hearth and a flue, wherein a cooling wall is arranged in the hearth, the cooling wall is composed of a plurality of water-cooled pipes which are distributed in parallel and fins welded between the two adjacent water-cooledpipes, one end of the flue communicates with the upper end of the hearth, an air preheater, an electrostatic dust remover and a desulfurization device are sequentially arranged from theend, close to the hearth, of the flue to theother end of the hearth, a plurality of air holes penetrating through the fins are formed in the fins, one end of apipeline communicateswith the interior of the flue, and the other end of the pipelinecommunicateswith the plurality of air holes through a flue gas fan. The flue gas fan is started, flue gas in the flue passes through theplurality of air holes through thepipeline and then is fed intothe hearth, the flue gas flowing into the flue forms a wall-mounted air curtain on the near wall surface of the cooling wall, so that coking slagging and high-temperature corrosion of the nearwall surface of the cooling wall are relieved.

Description

technical field [0001] The invention relates to the technical field of combustion equipment, in particular to a boiler system for alleviating coking and slagging and high-temperature corrosion of water walls, which is suitable for steam boilers, supercritical carbon dioxide power cycle boilers, other boilers and industrial furnaces. Background technique [0002] As the main equipment for energy efficiency conversion, the boiler plays an indispensable role in the power generation system. However, because most of the fuels used are low-quality fuels, the problems of ash accumulation, corrosion and coking and slagging will inevitably occur during the operation of the boiler. Especially after the country put forward the ultra-low emission standard, most power plant burners underwent low-nitrogen transformation, and there were obvious and serious coking, slagging and corrosion phenomena on the local fins of the boiler furnace cooling wall, which greatly increased the boiler cooli...

AI Technical Summary

Problems solved by technology

However, due to the fact that most of the fuels used are low-quality fuels, the problems of ash accumulation, corrosion and coking and slagging will inevitably occur during the operation of the boiler.

Especially after the country put forward the ultra-low emission standard, most power plant burners underwent low-nitrogen transformation, and there were obvious and serious coking, slagging and corrosion phenomena on the local fins of the boiler furnace cooling wall, which greatly increased the boiler cooling wall. The risk of tube explosion due to over-temperature, so solving the coking and corrosion problems of staves has become one of the technical difficulties

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