Four-corner tangential boiler and hearth thereof

Abstract

The invention relates to a hearth of a four-corner tangential boiler. Four groups of combustors are arranged in the hearth and are respectively arranged at four corners of the hearth; each group of the combustor comprises four groups of primary air nozzles, five groups of secondary air nozzles, a compact overfire air nozzle and a separation overfire nozzle along the height direction of the hearth; the four groups of primary air nozzles and the five groups of secondary air nozzles are arranged at intervals. The uppermost layer of the hearth of the four-corner tangential boiler adopts separation overfire air, and a deflection secondary air technology is adopted for part of the secondary air nozzles, so that the NOx emission content can be reduced, and the combustion efficiency can be improved; a main combustion region on the lower part can enable deflection secondary air to form a layer of air film near a water-cooling wall surface under an oxygen deficient condition, so that the phenomena of slagging and high-temperature corrosion of a water-cooling wall can be prevented; meanwhile, overtemperature pipe explosion of a water-cooling wall pipe is prevented favorably. Furthermore, the invention also relates to the four-corner tangential boiler with the hearth.

Description

technical field [0001] The invention relates to a pulverized coal combustion boiler, in particular to a four-corner tangential circle boiler and its furnace. Background technique [0002] With the increasing emphasis on environmental governance, countries are currently paying attention to nitrogen oxides (NO x ) emission control is becoming more and more stringent. my country's Ministry of Environmental Protection has also promulgated the "Technical Policy on Nitrogen Oxide Prevention and Control in Thermal Power Plants", which clearly states that during the "Twelfth Five-Year Plan" period, my country will fully promote NO x prevention work. At present, domestic and foreign power plant boilers control NO x There are two main technologies: one is to control the generation, mainly to change the combustion conditions of coal through various technical means in the combustion process, so as to reduce NO x The amount of production, that is, various low NO x technology; the se...

AI Technical Summary

Problems solved by technology

[0003] NO x Disadvantages of high emissions, and the combustion efficiency of coal needs to be improved

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