JPS6051601B2 - Fluidized bed furnace startup burner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a startup burner device for heating a fluidized medium during startup of a fluidized bed furnace such as a swirling spouted bed furnace.

Recently, in boilers used in various industries including power plants, unburned carbon and sulfur oxide ( Ammonium sulfate [(
N.H. ). S.O. ] have increased, and the amount of soot and dust in the exhaust gas has increased. Therefore, the amount of soot and dust collected by dust collectors has become enormous due to the increase in the size of plants. One of the methods for treating the collected soot and dust is to incinerate it in an incinerator from the viewpoint of the size of the soot and the effective use of the energy retained in unburned carbon and the like. In particular, a fluidized bed furnace, in which the soot and dust to be combusted is fed into a high-temperature fluidized medium such as sand, mixed and stirred for incineration, is suitable for incinerating soot and dust because it has high combustion efficiency and a uniform combustion reaction. However, if the fluidized medium is started at a low temperature, various problems will occur. For example, when the bed temperature is 270 to 380°C, ammonium sulfate in the dust becomes highly viscous acidic ammonium sulfate (Nll, HSO0) as shown in the formula below. Obstructs the flow of fluid media. (NH4)2SO4→NIIIHSO4+H2
Therefore, in order to sufficiently heat the fluidized medium when starting the fluidized bed furnace, a startup burner is installed that injects flame onto the surface of the fluidized medium.

However, soot and dust adheres to the inner wall surface of the flame passage of the startup burner, and when the burner is used, it forms a sintered lump due to heat, degrading the performance of the burner. In addition, when the fluidized medium in the furnace is completely heated and normal operation begins, vanadium pentoxide (V.q) contained in the soot melts and flies to and adheres to the inner wall of the flame passage of the starting burner. As with the baked ingot, it had the disadvantage of deteriorating the performance of the burner. An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a fluidized bed furnace startup burner device that does not cause the formation of baked ingots or the accumulation of V2q in the startup burner.

In short, the present invention provides air jet nozzles from multiple countries around the starting burner nozzle to form a film of air around the flame to prevent the formation of burnt lumps and the adhesion of V, 05, etc. The air can also be used as secondary air for the sky tower burner.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Arrow 1 indicates a swirling spouted bed furnace, in which the air passing through the small holes 4 of a funnel-shaped perforated plate 3 provided at the bottom of the furnace gives a swirling flow to the internal fluidizing medium 6, and the air is ejected from the central bottom of the perforated plate 3. The structure is such that a jet flow is generated by the upward flow of air. 5 is an empty column provided on the upper part of the perforated plate 3;
A burner cylinder 7 for a starting burner is provided at the lower part of the fluidizing medium 6 and at a position where a flame is injected into the fluidized medium 6. 8 is this burner tube 7
The burner nozzle 8 is a burner nozzle that injects flame through the burner nozzle 8, and an air injection port 10 is provided in an annular shape around the burner nozzle 8, as shown in FIG.

The air injection port 10 may have a circular cross section as shown in the figure, or may have an arcuate slit shape. 9 is an air chamber, 11 is an air pipe for supplying air to the air chamber 9, 12 is an auxiliary combustion burner, and 13 is a supply port for supplying materials to be incinerated such as soot and dust.

In the incinerator with the above configuration, at startup, the startup burner 8
The fluidized medium 6 is heated using the air injection port 1.
Air is injected from 0 to surround the flame to prevent the formation of baked ingots and the adhesion of V2O on the inner surface of the burner cylinder 7.

When the temperature of the fluidized medium 6 reaches approximately 500° C. by the starting burner 8, the supply of soot and dust from the incineration material supply port 13 is started.
The soot dust supplied to the fluidized medium 6 in a swirling jet state is mixed and agitated and combusted. However, depending on the type of soot dust, it may be difficult to do so naturally, and in this case, combustion is performed using the auxiliary combustion burner 12. Since the present invention is configured as described above, a fixed accumulation of dust is formed on the starting burner cylinder.

And (1) Since there is no adhesion of 205, the performance of the burner will not be degraded. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a swirling spouted bed furnace equipped with a starting burner according to the present invention, and FIG. 2 is an enlarged view of the sectional view taken along line A--A in FIG. 1. .

1... Rotating spouted bed furnace, 3... Perforated plate,
4...Small hole, 5...Sky tower, 6...
... Fluid medium, 7... Burner tube, 8...
・Burna nozzle, 9... Air chamber, 10...
...Air injection port, 11...Air pipe, 12...
...Auxiliary combustion burner, 13...Incineration material supply port.

Claims (1)

[Scope of Claims] 1. In a starting burner provided in the empty column of a fluidized bed furnace, a plurality of air injection ports are provided around the burner nozzle at intervals that allow an air layer to be formed between the inner wall of the burner cylinder and the starting burner flame. A fluidized bed furnace starting burner device characterized by being provided with. 2. The fluidized bed furnace starting burner device according to claim 1, wherein the air injection port has a circular cross section. 3. The fluidized bed furnace starting burner device according to claim 1, wherein the air injection port has a slit shape.