JPS6057117A - Ash dispersing nozzle structure - Google Patents

Abstract

PURPOSE:To prevent accumulation of ash, by a method wherein ash dispersing nozzles are mounted to a spot where stagnation is apt to be created in a flow within a flue duct and a spot where a velocity of flow is low and ash is apt to be accumulated, and the air is injected in a way to vary the direction of injection. CONSTITUTION:Valves 14 are attached to air pipings 13 branched from an air main pipe 15, and a flexible hose 12 is connected to a nozzle 3 by means of a coupling 11. Therefore, with the valves 14 opened, the air is injected through an injection hole 5 in a nozzle 3, and ash 2 is dispersed to the wake flow side. The injection holes in the nozzle 3 are about 1-4 in number to increase an injection speed and therefore, the air may be injected over the range of 360 deg. in order to fly the ash effectively. A handle 7 is attached to the nozzle 3 which is connected to a piping 13 by means of the flexible hose 12, and this enables rotation of the nozzle 3 by means of the handle 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ash scattering nozzle structure that can be applied to coal combustion boilers, cement kiln exhaust gas boilers, and the like.

As an ash scattering nozzle structure that scatters ash to the wake, soot blowers are conventionally used for boiler bodies and denitrification equipment.
has been proposed, but there has been no proposal for installing a flue through a location where ash is likely to accumulate as in the present invention.

The present invention is applied to a flue duct of a coal-fired boiler, and when coal combustion ash accumulates in spots where the gas flow rate is slow,
The present invention aims to provide a simple ash scattering nozzle structure for scattering the ash and transporting it to the downstream stream.

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

Figure 1 shows an example of the flue 1 of a typical coal-fired boiler.
This shows a state in which combustion ash 2 tends to accumulate.

FIG. 2 shows an example in which an ash scattering nozzle 3 according to an embodiment of the present invention is attached to a part where ash tends to accumulate. Further, FIG. 4 shows the structure of the ash scattering nozzle 3. In Fig. 4, 4 is a blind plate, 5 is an injection hole provided on the upper side of the nozzle 3, 6 is a collar attached to the nozzle 3, 7 is a handle attached to the nozzle 3, 8 is a flue duct, and 9 is a duct. 8 is a supporting/sealing ring for the nozzle 3 attached to the nozzle 3, 10 is a sealing gasket, 11 is a threaded coupling, and 12 is a flexible hose. When the handle 7 is held and rotated, the collar 6 connects the duct 8 and the seal ring 9. Since it is sandwiched between the two, the duct 3 can be rotated.

Next, to explain the operation, FIG. 8 shows a situation in which the ash scattering nozzle 3 according to the present invention is attached to a part of the flue 1 where ash 2 is likely to accumulate, and air is blown.

That is, as shown in the figure, the air pipe I3 branches from the air main pipe 15.
Since the flexible hose 12 and the nozzle 3 are connected by the coupling 11 as shown in FIG. is scattered to the downstream side.

Note that the number of injection holes in the nozzle 3 is approximately 1 to 4 (3 in Fig. 5) in order to increase the injection speed.
In order to blow away the ash more effectively, it is best to spray air over a 360° range. Therefore, the nozzle 3 is provided with a handle 7, and the connection to the piping 13 is made with a flexible hose 2.
The nozzle 3 can be rotated by a handle 7.

Figures 9(a), 9(b), and 9(c) show the relationship between the rotation of the nozzle 3 and the air injection situation, making it possible to scatter ash over almost the entire circumference. In addition,
The number of installed nozzles can be set to one or more, taking into consideration the blowing speed, effective radius, duct area, etc.

As for the operation method of this nozzle 3, in the above case, manual operation was mainly explained in the field, but as shown in Fig. 10, the large mouth valve is replaced with a solenoid valve 18, and the opening and closing is controlled by remote control from the central control room or by blowing. You can set the time and fully automate it.

Further, the nozzle can be rotated automatically in conjunction with the opening/closing operation of the valve by employing a known method (for example, the rank and pinion method shown in FIG. 10). Note that 16 is a rack, and 17 is a rank drive device (pinion).

Since the present invention is configured as explained in detail above,
By jetting air from the scattering nozzle of the present invention by changing the jetting direction, it is possible to scatter the ash accumulated in the slow-flowing parts of the flue and carry it to the downstream side along with the gas flow. This prevents ash from accumulating in areas where stagnation is likely to occur in the flue flow.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view, not showing an example, of a flue of a general coal-fired boiler; Fig. 2 is a cross-sectional view showing an ash scattering nozzle according to an embodiment of the present invention installed in the flue; The figure is D- in Figure 2.
D sectional view, FIG. 4 is a partial side view of the same nozzle, FIG. 5 is a sectional view taken along line AA in FIG. 4, and FIG. 6 is taken along B-Blf in FIG.
r side view, Figure 7 is a CC sectional view of Figure 4, Figure 8 is a sectional view showing the installation state of the same nozzle, and Figures 9 (A), (B), and (C) are the rotational states of the same nozzle. Fig. 10 is a side view showing a nozzle rotation mechanism different from Fig. 4;
The figure is a sectional view taken along the line EE in FIG. 10. Explanation of the main parts of the figure 1 - Flue 2 - Ash 3 - Nozzle 5 - = Injection hole 7 - Handle 8 - Flue duct 13 - Air piping etc. JP-A-Sho GO-57117 (3) Fan 9 (A) (/,). d31σ ＼ 5 / lachrymal

Claims (1)

[Claims] In boilers that contain a large amount of ash in the exhaust gas, such as coal-fired boilers or cement kiln exhaust gas boilers, this product can be used in areas where stagnation tends to occur in the flue flow from the boiler outlet to the chimney, or where ash is likely to accumulate in areas where the flow rate is slow. , an ash scattering nozzle characterized in that an ash scattering nozzle is attached through a flue, and a mechanism is provided to rotate the nozzle manually or automatically to change the direction of air injection, thereby scattering ash. structure.