DC and swirl combined burner

Abstract

The direct-flow and swirl-flow combustible burner relates to a burner that combusts liquid fuel and powder fuel at the same time. The characteristic is that the axial flow air channel is composed of axial flow air duct and radial air duct, the radial air channel is composed of radial air duct and pulverized coal air duct, and the axial flow air channel and radial air channel are connected together to form a mixed air channel. A nozzle ring is provided at the opening of the mixing air channel; the pulverized coal air pipe and the central mixing air pipe form the pulverized coal air channel; on the coal pipe. The advantages are: novel and compact structure, easy to manufacture, and reliable use; it solves the problem of mutual interference between direct air and swirling air, increases the degree of separation, quickly disperses coal powder, shortens the length of the black fire head, and reduces the amount of primary air and NOx emissions ; The pulverized coal is evenly distributed, and the combustion is sufficient, which improves the combustion efficiency, saves energy and reduces consumption; reduces pipeline wear, prolongs service life, and reduces spare parts consumption, which is beneficial to production.

Description

technical field [0001] The invention belongs to a burner, in particular to a burner which burns liquid fuel and powder fuel simultaneously. Background technique [0002] At present, industrial kilns mostly use four-channel or multi-channel burners. A "secondary enhanced swirl cement burner" (CN201434389Y) disclosed by the China Intellectual Property Office. The center of the burner is a fuel pipe, and the fuel pipe has layers of pipes that are coaxially sleeved from the inside to the outside: DC cooling air channel, secondary swirling air channel, coal conveying air channel, main swirling air channel, and jetting air channel; there are multiple points of support between the pipe layers, the direct current cooling air channel has an orifice plate, and the secondary swirling air channel has a swirling oblique orifice plate. Its defect is: the area of ​​the nozzle is small, the inner swirl wind and the outer dc wind are very close, and there is no separation, the inner swirl ...

AI Technical Summary

Problems solved by technology

Its defect is: the area of ​​the nozzle is small, the inner swirl wind and the outer dc wind are very close, and there is no separation, the inner swirl wind interferes with the movement direction of the outer dc wind, making the dc wind move closer to the swirl wind, resulting in a The consumption is large and the waste is high; the separation between the swirling air and the direct air is not good, the pulverized coal disperses slowly and the effect is poor, the black fire head is long, the combustion is insufficient, and the pulverized coal and fuel consumption are high; In the center line of the coal pipe, the coal powder directly collides with the central air duct in the middle and wears the pipe; the middle pipe will split the coal powder flow into two, and then rejoin at the back, which will easily cause the pipe at the confluence to wear through; due to the two streams of coal The reason why the pulverized coal flows into water ripples and the pulverized coal sinks due to its own weight causes the distribution of pulverized coal in the pulverized coal air channel to be extremely uneven, which also leads to insufficient combustion

In addition, the structure of the burner is complicated, and the nozzle ring is separately arranged on two pipes, which is easily deformed during high-temperature combustion, which brings difficulties to maintenance or is scrapped.

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