Low-nitrogen combustion device and method

Abstract

The invention relates to a low-nitrogen combustion device and an application method thereof. The device comprises an outer shell, a gas distribution chamber, a plurality of gas mixing pipes, an anti-backfire cavity, a combustion chamber, an ignition needle, a heat exchange tube bank, a first water inlet pipe, a first water outlet pipe, a second water inlet pipe and a second water outlet pipe, wherein the anti-backfire cavity is arranged on the rear side of the gas distribution chamber; the plurality of gas mixing pipes are transversely and uniformly distributed in the anti-backfire cavity; theignition needle is arranged in the combustion chamber and is closely attached to the wall of the anti-backfire cavity; the heat exchange tube bank is arranged on the rear side of the anti-backfire cavity, and the distance between the heat exchange tube bank and the anti-backfire cavity is 40-80 mm; and the anti-backfire cavity is connected with the first water inlet pipe and the first water outlet pipe, and the heat exchange tube bank is connected with the second water inlet pipe and the second water outlet pipe. The low-nitrogen combustion device comprehensively utilizes a water cooling technology, a premixing technology and an anti-backfire technology, effectively reduces the emission of nitrogen oxides by reducing the temperature of a flame surface, solves the problems of high emissionof nitrogen oxides and carbon monoxide or premixed backfire and the like of a full premixed condensing boiler in the current market, and can be widely suitable for a commercial or domestic distributed heating system.

Description

Technical field [0001] The invention relates to a combustion device, in particular to a low-nitrogen combustion device. Background technique [0002] The emission of nitrogen oxides is an important reason for the formation of atmospheric smog and acid rain. In order to strengthen environmental governance, the environmental protection department has increasingly tightened the emission standards of nitrogen oxides, requiring existing boilers to be upgraded with low nitrogen, and new boilers to adopt low nitrogen. Nitrogen combustion technology to ensure the emission of nitrogen oxides at 30mg / m 3 the following. [0003] According to the combustion mechanism, when the temperature of the combustion flame front is higher than 1500°C, nitrogen oxides begin to be generated, and every time the flame front temperature increases by 100°C, the synthesis rate of nitrogen oxides increases by 6-7 times. [0004] In order to reduce the emission of nitrogen oxides, it is necessary to lower the flam...

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Problems solved by technology

[0007] A slit-type flame combustion device disclosed in Chinese patent CN207394839U utilizes the fully premixed condensation technology, in which the premixed gas is ejected from the vertical strip-shaped gap, but the gap is too long to easily cause uneven gas distribution , the high-temperature flame is locally concentrated, which increases the emission of nitrogen oxides

In addition, in order to stabilize the flame, a row of flame-stabilizing tubes is set in the patented technology. The flame-stabilizing tubes are arranged in the flame. The water in the flame-stabilizing tubes will rapidly reduce the temperature of the flame, which will cause an increase in CO emissions.

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