A high-temperature flue gas recirculation pre-combustion low NOx burner equipped with sofa

Abstract

The invention discloses a high temperature flue gas recirculation precombustion type low NOx combustor provided with SOFA. The combustor comprises a precombustion chamber, wherein a middle core tube is arranged at one side of the inlet of the precombustion chamber, an external secondary air and SOFA air sleeve is arranged on the precombustion chamber, a plurality of external secondary air spray holes are formed in the side wall of the precombustion chamber, and a plurality of SOFA air direct flow spray holes are formed in the outer side of the shell of the precombustion chamber; the inlet of a cyclone internal secondary air sleeve is communicated with a cyclone internal secondary air passage, and the outlet is communicated with the precombustion chamber. According to the invention, the coal dust low temperature precombustion technology is adopted, coal dust is carried by primary air to enter the precombustion chamber, and pre-combusts under the reducing atmosphere of the precombusiton chamber. Internal secondary air is divided into two paths by a flap valve and mainly functions in disturbing and mixing, and different internal secondary air cyclone strengths can be formed by adjusting the opening of a cyclone internal secondary air regulating valve and a direct flow internal secondary air regulating valve. The combustor disclosed by the invention can effectively reduce emission of NOx, is good in flame stability and contributes to the reduction of NOx pollutant emission of thermal power enterprises.

Description

【Technical field】 [0001] The invention belongs to the technical field of thermal energy and power engineering, and relates to a high-temperature flue gas recirculation pre-combustion type low NOx burner equipped with SOFA. 【Background technique】 [0002] NO x It is one of the culprits that caused large-scale smog in recent years. In addition, NO x It will also induce a series of environmental problems such as photochemical smog and acid rain, and coal-fired boilers are my country's NO x One of the most important sources of emissions, dust and SOx pollution control has achieved great results after years of efforts, but NO x Emissions controls are still relatively backward. According to the latest data from the Ministry of Environmental Protection, the total national nitrogen oxide emissions in 2012 were 23.378 million tons, and thermal power emissions accounted for about 35% to 40%, posing a serious threat to our environment. Therefore, the country has formulated more and...

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Problems solved by technology

[0002] NO x It is one of the culprits that caused large-scale smog in recent years. In addition, NO x It will also induce a series of environmental problems such as photochemical smog and acid rain, and coal-fired boilers are my country's NO x One of the most important sources of emissions, dust and SOx pollution control has achieved great results after years of efforts, but NO x Emission control is still relatively backward

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