High-temperature corrosion-resistant nozzle for coal-fired power station

Abstract

The invention relates to a high-temperature corrosion-resistant nozzle for a coal-fired power station. The high-temperature corrosion-resistant nozzle comprises a high-temperature-resistant stainlesssteel barrel, and the barrel is provided with a water-cooled wall. An air distributing cone used for blowing air diversion and distribution is arranged in the barrel, and the air distributing cone isperforated into the barrel from an rear-end opening of the barrel. Four metal division plates used for guiding airflow are arranged around the air distributing cone in the barrel, and blowing air flowchannel in the barrel is divided into an upper part, a lower part, a left part and a right part. A regulating valve is arranged at the front end in the barrel. Under the division action of the division plates, an upper air chamber, a lower air chamber, a left air chamber and a right air chamber which are independent are formed after blowing air enters the regulating valve. The blowing air is distributed into the upper air chamber, the lower air chamber, the left air chamber and the right air chamber which are mutually independent through the division plates in the barrel. The angle of a valvebaffle plate is controlled, so that the downward blowing air is strengthened to achieve the best high-temperature corrosion-resistant effect.

Description

technical field [0001] The invention relates to the technical field of ash deposition and high-temperature corrosion control in coal-fired power stations, in particular to a high-temperature corrosion-resistant nozzle for coal-fired power stations Background technique [0002] At this stage, my country's coal-fired units have generally carried out low-nitrogen burner transformation, which can easily cause anoxic combustion at the water wall of the furnace, and the formation of a strong reducing atmosphere greatly accelerates the process of high-temperature corrosion. The water-cooled wall pipes will continue to thin due to high-temperature corrosion, and when the thickness reaches a certain level, it will cause a "pipe burst" accident, which will seriously affect the safe operation and economic benefits of the power plant. . [0003] The use of wall-attached air can improve the problem of high-temperature corrosion. According to the position of wall-attached air sprayed int...

AI Technical Summary

Problems solved by technology

Due to the small secondary air pressure, a relatively large air volume (accounting for about 5% of the total air volume) is required to protect the water-cooled wall at the most severely corroded part in the middle of the side wall, so that the secondary wind pressure is very small. Secondary air pressure becomes smaller, thus adversely affecting furnace combustion and airflow organization

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