Primary air opposite-flushing device for preventing boiler rear wall water cooling wall from slagging and corroding

Abstract

The invention discloses a primary air opposite-flushing device for preventing a boiler rear wall water cooling wall from slagging and corroding. The device comprises primary air opposite-flushing nozzles arranged on a rear wall of a boiler in a layered manner, and the primary air opposite-flushing nozzles and turbulent combustors arranged on a front wall of the boiler in a layered manner are arranged in a one-to-one opposite manner. The primary air opposite-flushing nozzles and primary air pipes of the turbulent combustors are positioned on the same central axis; and the primary air opposite-flushing nozzles are connected with an opposite-flushing air mother pipe through pipelines with valves. On one hand, the rear wall water cooling wall can be prevented from being scoured by pulverized coal, the problems of slagging and high-temperature corrosion are solved, the primary air speed and the secondary air rotational flow strength of the turbulent combustors on the front wall can be flexibly adjusted by combining the unit load and the fire coal quality, and the adherence atmosphere of the rear wall water cooling wall does not need to be considered; and on the other hand, under the condition that the amount of air entering a hearth is certain, part of air enters the hearth through the primary air opposite-flushing nozzles of the rear wall, the air staged combustion effect can be achieved, and NOx generated by combustion is reduced.

Description

Technical field[0001]The present invention belongs to the field of boiler, and in particular to one wind delay device for preventing wall water cold walls of the boiler and corrosion.Background technique[0002]High temperature corrosion is the main problem in the boiler water wall of the boiler of the coal-fired power plant, which seriously affects the safe and stable operation of the boiler. The high temperature corrosion problem of boiler water and cold wall is mainly related to factors such as a reducing atmosphere, flue gas and pulverized coal flow in the vicinity of water-cooled walls. The coal-fired sulfur is blended under an oxygen in the furnace, and the combustion produces a certain amount of H.2S, h2S can be directly reacted with a pure metal in the water-centrifugal wall to form FES. Hide2S can also be with water-cooled wall surface3O4FEO in the oxide layer (Fe "3O4= Fe2O3· Feo) Reaction Generate FES. When the gray layer temperature is high, the FES will once again with th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a primary air hedging device for preventing slagging and corrosion of the water-cooled wall of the boiler's rear wall, which is stab

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