Nozzle and manufacturing method thereof

Abstract

The invention discloses a nozzle and a manufacturing method thereof and belongs to the technical field of premixed gas burners. The nozzle comprises a primary air channel, secondary air channels and a natural gas channel which are located inside a nozzle body, the primary air channel comprises a uniform-section channel section and a gradually-wide channel section in sequence from a primary air inlet to a primary air outlet, three or more secondary air channels are distributed around the primary air channel, and a natural gas outlet of the natural gas channel is communicated with the gradually-wide channel section; the included angle delta between the natural gas channel and the central axis of the uniform-section channel section is greater than or equal to 30 degrees and less than or equal to 50 degrees; the included angle beta between two side edges on the axial cross section of the gradually-wide channel section is greater than or equal to 34 degrees and less than or equal to 60 degrees; the included angle gamma between each secondary air channel and the central axis of the uniform-section channel section is greater than or equal to 0 degree and less than or equal to 10 degrees. The nozzle is good in comprehensive combustion performance and used for gas combustion.

Description

technical field [0001] The invention belongs to the technical field of premixed gas burners, and more specifically relates to a burner and a manufacturing method thereof, especially suitable for regenerative burner systems. Background technique [0002] The regenerative high-temperature air combustion technology called HTAC (High Temperature Air Combustion) abroad is a new concept of combustion technology proposed by foreign countries in the last century. This technology organically combines flue gas waste heat recovery with high-efficiency combustion and low NOx technologies. It preheats the combustion-supporting air from room temperature to a high temperature of 800-1000°C through high-efficiency heat storage materials, thereby achieving extreme energy saving and extreme reduction of NOx Emissions serve a dual purpose. [0003] Although regenerative high-temperature combustion technology is an energy-saving, environmentally friendly high-tech. However, domestic natural g...

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Problems solved by technology

But, after actually using the burner of this application, it is found that the burner of this application also has the following defects that are difficult to overcome: (1) in this application, although the circumferential distribution structure of the natural gas channel is conducive to the mixing of natural gas and combustion-supporting air , but the burner in this application is a non-premixed gas burner, and the mixing of natural gas and combustion-supporting air is still unsatisfactory during combustion; Although the slender natural gas channel in the brick body disperses the natural gas and has the effect of refining and diverting the natural gas, it is found that the slender natural gas channel is prone to blockage during actual use, which seriously affects the smooth flow of production; (3) the When the burner of the application is in use, the shape of the flame cannot be effectively controlled, which often makes the temperature near the burner higher, resulting in a limited service life of the burner

However, the burner of this application still has the following disadvantages in actual use: the shape of the flame is difficult to keep stable during the combustion of natural gas, so that the temperature field in the furnace is difficult to stabilize, and cannot meet the occasions with high heating requirements.

The above-mentioned technical solutions are aimed at improving the structure of the burner, all of which are based on improving the mixing of fuel and air. The structure is relatively complicated, and it is inconvenient to maintain and manufacture. In addition, further improvement is still needed on the regulation of flame temperature, length, and combustion range.

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