Wall-attached wind nozzle, boiler and boiler system

Abstract

The invention discloses a wall-attached wind nozzle, a boiler and a boiler system. The wall-attached wind nozzle ejects over fire air, is arranged on a wall of the boiler, and comprises a wind inlet channel inserted in the wall of the boiler; the wind inlet channel is communicated with an over fire air source; the wall-attached wind nozzle further comprises an exhaust channel communicated with a wind inlet channel; and the exhaust channel ejects wall-attached wind operated along the wall of mounting the wall-attached wind nozzle. The over fire air ejected by the exhaust channel of the wall-attached wind nozzle can be operated along the wall to form the wall-attached wind so as to form an oxide protection layer on the surface of the wall to prevent a reductive environment from causing high-temperature corrosion to the wall. Moreover, the over fire air is operated along the wall without disturbing an airflow in a hearth and causing the influence on a daily operation mode of the boiler.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a wall-attached air nozzle, a boiler and a boiler system. Background technique [0002] Coal-fired boilers are equipment that use the heat energy released by coal combustion to heat working fluids to produce steam, hot water, etc. with rated parameters and quality. [0003] With the implementation of new national environmental protection regulations, the requirements for NOx emissions are more stringent. In order to comply with the specification, there are mainly two ways to reduce NOx emissions, mainly for wall-type contrasting coal-fired boilers. One way is through fuel classification; the other is air classification. [0004] Fuel grading is mainly through the separation of thick and thin coal powder, that is, the staged combustion of dense coal powder and light coal powder is formed in the burner; [0005] Air classification is divided into two types: air classification com...

AI Technical Summary

Problems solved by technology

Because this area is originally used to reduce NOx, the side wall 13 is completely exposed to the reducing flue gas, and the CO concentration is generally higher than 5000-10000ppm, which is very easy to cause 2 High temperature corrosion caused by S and reducing gases

Moreover, with the development of large-scale power plant boilers 1 towards large capacity and high parameters, the temperature of the water-cooled wall tube wall of the side wall 13 of the boiler 1 will increase accordingly, and the frequency of high-temperature corrosion of the water-cooled wall of the side wall 13 will increase greatly. have a greater impact on the safety and economy of

[0011] Although, in the main combustion zone C, after the primary air and the secondary air are mixed, the primary air is wrapped in the secondary air, and the front wall 11, the rear wall 12, and the water-cooled walls near the side wall 13 are generally in an oxidative atmosphere, High-temperature corrosion is not obvious, but due to the unevenness of the injection gas or the influence of unstable air flow, high-temperature corrosion may also occur in these positions, including burnout zone A, etc.

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