Double-internal-circulation low-nitrogen combustor

Abstract

The invention discloses a double-internal-circulation low-nitrogen combustor. The double-internal-circulation low-nitrogen combustor comprises an air cylinder, a first fuel supply pipe, a second fuelsupply pipe, an outer injection pipe, a fan and a flame stabilizing disc, wherein the first fuel supply pipe is arranged in the air cylinder, and a plurality of inner branch air pipes are arranged atthe front end of the first fuel supply pipe and used for supplying fuel to central flames; the second fuel supply pipe is arranged outside the air cylinder and used for injecting the fuel to form divided flames; the front end of the air cylinder is sleeved with a mixing cylinder, and a first smoke backflow opening is formed by a channel between the mixing cylinder and the air cylinder; the outer injection pipe is arranged in front of a nozzle and located outside the mixing cylinder, and a second smoke backflow opening is formed by an inlet of the outer injection pipe; and the first smoke backflow opening is located in front of the second smoke backflow opening. According to the double-internal-circulation low-nitrogen combustor, the central flame stabilizing technology and the FIR technology are comprehensively utilized, double-internal-circulation low-nitrogen combustion is achieved, emission of nitric oxide can be effectively reduced, and the heat efficiency, safety and stability ofcombustion are improved.

Description

technical field [0001] The invention relates to the technical field of gas burners, in particular to a double internal circulation low nitrogen burner. Background technique [0002] The national environmental protection policy is becoming more and more stringent, and the requirements for nitrogen oxide emissions from boilers are also getting higher and higher. Most of the low-nitrogen combustion burners currently on the market use nitrogen reduction methods including FGR (FlueGas Recirculation, flue gas recirculation) technology, premixed combustion technology, etc., which have unavoidable shortcomings while achieving the nitrogen reduction effect. For example, burners using FGR technology are prone to problems such as flue gas condensate corrosion and surge; premixed combustion technology is prone to problems such as low thermal efficiency caused by high oxygen content in flue gas, and the risk of backfire. Contents of the invention [0003] The object of the present inv...

AI Technical Summary

Problems solved by technology

At present, most of the low-nitrogen combustion burners on the market use nitrogen reduction methods including FGR (FlueGas Recirculation, flue gas recirculation) technology, premixed combustion technology, etc., while achieving the nitrogen reduction effect, there are unavoidable shortcomings.

For example, burners using FGR technology are prone to problems such as flue gas condensate corrosion and surge; using premixed combustion technology is prone to problems such as low thermal efficiency caused by high oxygen content in flue gas, and the risk of backfire

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