Fully premixed metal fiber burner and boiler using the burner

Abstract

The invention belongs to the technical field of combustion equipment, and relates to a full-premix type metal fiber combustor and a boiler adopting the combustor. The full-premix type metal fiber combustor comprises a draught fan, an air mixing unit and a combustion head. The draught fan is connected with the air mixing unit and used for providing air needed for combustion. The air mixing unit is connected with the combustion head and used for conducting mixing and conveying needed air and fuel gas mixed gas to the combustion head. The air mixing unit comprises an air mixing pipe and air mixing discs. A plurality of sets of through holes are formed in the side wall of the air mixing pipe in the circumferential direction. The first air mixing disc and the second air mixing disc are sequentially arranged in the gas flow direction. The air mixing pipe is arranged between the first air mixing disc and the second air mixing disc, and the first air mixing disc abuts against the air mixing pipe. According to the combustor, air and fuel gas are fully mixed, combustion is sufficient, nitrogen oxide emission is low, and high efficiency and energy saving are achieved. Meanwhile, the size of a boiler furnace of the boiler is greatly reduced, and the interior of the boiler furnace is heated evenly.

Description

technical field [0001] The invention relates to the technical field of combustion equipment, in particular to a fully premixed metal fiber burner and a boiler using the burner. Background technique [0002] With the improvement of living standards and awareness of environmental protection, people pay more and more attention to the emission of harmful gases produced by burners during the combustion process, especially the emission of nitrogen oxides in gas water heaters or gas boilers. At present, controlling boiler nitrogen emissions is one of the key tasks of the country to control smog. Beijing has issued a revised new "Boiler Air Pollutant Emission Standard", which stipulates that from July 1, 2015, the emission limit of new boilers will be tightened from the current 150 mg / m3 to 80 mg / m3; 2017 From April 1, 2010, the nitrogen oxides of newly built boilers will be further tightened to 30 mg / m3. Seeking a technical path to control nitrogen emissions from boilers has beco...

AI Technical Summary

Problems solved by technology

[0003] At present, in the domestic market, there are two main technologies adopted to control nitrogen emissions: one is to control nitrogen emissions at 50-80 mg / m3 by installing a flue gas circulation device, but this technology still cannot reach 30 mg / m3 The most stringent standard, and its cost is too high, not suitable for popularization and application

The second is to reduce nitrogen emissions by chemically treating the flue gas. This method is complex, the treatment effect is not ideal, and the post-treatment cost is also very high.

There are many types of air mixing units in some metal fiber burners in the prior art, but they still have insufficient combustion caused by uneven mixing of gas and air and inability to effectively adjust the ratio of air and gas

At the same time, the influence of impurities such as particles in the air intake process is not considered, so that the metal fiber combustion head is blocked due to the presence of impurities in the air during the combustion process, thereby affecting the service life of the combustion head, and affecting the combustion and emission quality

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