Apparatus for adjusting secondary wind direction under W type flame oven arch

Abstract

The invention discloses a device for adjusting the direction of under-arch secondary air of a W-shaped flame furnace. More than two guide blades (1) are connected with each other through a connection hinge (2), a rotation shaft (3) is arranged on each guide blade (1), the guide blades (1) are arranged between an orifice plate (5) and a water-cooling wall pipe (6) of an under-arch secondary air chamber (4) of the W-shaped flame furnace, an adjusting arm (7) is arranged on one of the guide blades (1), and a pull rod (8) is connected with the adjusting arm (7). The device can set different under-arch secondary air inclination angle according to different conditions of each burner and can adjust the under-arch secondary air inclination angle to adapt to different areas (altitudes) and different coal qualities. Under proper lower inclination angle of the under-arch secondary air, the undershoot stroke of the flame and the coal retention time are increased remarkably, and the flame filling degree and uniformity in the lower furnace are improved remarkably, thus effectively improving the burn-out rate of pulverized coal and saving energy resource by about 30 to 50%.

Description

technical field [0001] The invention relates to a W-shaped flame furnace, in particular to a device for adjusting the secondary air direction under the W-shaped flame furnace arch. Background technique [0002] The w-shaped flame combustion furnace is a kind of combustion furnace that promotes the combustion rate of pulverized coal by increasing the flame stroke. This technology has been adopted by the boilers of some domestic power plants. This kind of combustion furnace arranges the pulverized coal airflow nozzle on the arch, and sets the secondary air inlet on the side wall of the combustion furnace, from which the secondary air intake is horizontally injected into the furnace. The downward direction of the furnace is blocked by the secondary air intake, and it is turned upward in advance, so that the residence time of the pulverized coal particles in the furnace is shortened, which is unfavorable for the burnout of the pulverized coal. The invention patent application w...

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Problems solved by technology

However, in the actual operation, it was found that the effect was not very satisfactory. The reasons are: firstly, due to the different altitudes and coal quality changes in various regions, the horizontal deflector in the W-shaped flame furnace is inconvenient to adjust, so it cannot be suitable for various furnaces. Regardless of the region and coal quality, there are still problems such as high-load unstable combustion, difficulty in adding air, and extremely poor combustion economy. At the same time, there is also the problem of high NOx emissions that are common in W flame boilers.

The second fixed horizontal deflector is easy to collect dust on the reverse flow plate and the bottom of the secondary air intake chamber (F air chamber), which affects the air intake effect

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