JPS63194117A - Soot blower - Google Patents

Abstract

PURPOSE:To prevent water-wall tubes from being injured by drain in a steam pipe at the starting time and by steam and dust at the time of soot blowing, by weakening the injection flows from injection ports of small diameter and of large diameter which hit against the water-wall tubes, by parting the ports from the water-wall tubes and by discharging drain from a piping by slightly opening a main valve. CONSTITUTION:A nozzle 5 has a small injection port 16 and a large injection port 17, and they start injecting at positions 16a, 17a, rotating and advancing till they come to positions 16a, 17b, while injecting, stop injecting at the backwarding positions 16a, 17b, going back to the positions 16, 17, and waiting. The small injection port 16 is provided in the neighborhood of the water-wall tubes 2 of a furnace, but it is set toward the inside of a furnace and the impact of an injection flow to the water-wall tubes 2 of a furnace is suppressed low in order to prevent the water-wall tubes from being injured. The large injection port 17 is provided slantly to the side of the water-wall tubes 2 of a furnace, so that the injection flow hits against the tubes 2 swirlingly, and the cleaning effect and the area to be cleaned are increased. The roller 15 of a gear box 18 contacts the bottom side 19a of a cam 19 at the time point 16a of a small injection port 16, and a main valve 12 is slightly opened by a rod 20 and an arm 21 to discharge drain from a piping. Then the nozzle 5 projects to the inside of a furnace, the main valve 12 opens fully, the nozzle 5 stops advancing at the position 17a of a large injection port 17, rotating, and blowing soot adhering on the wall of a furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The object of the present invention is to provide a soot blower suitable for preventing erosion of a furnace ice wall tube and improving the cleaning effect in a coal-fired boiler or the like.

<Conventional technology and its problems> Conventional short-slip type soot blowers have one injection hole in the nozzle to improve cleaning power, but in recent years, depending on the type of coal, it has been found that the ice wall tubes of the furnace can be seriously damaged. has increased.

When the nozzle is inserted into the furnace and the nozzle hole is slightly inside the furnace than the ice wall tube, the nozzle stops advancing and rotates while spouting the injection medium to clean the ice wall tube. Because the ice wall tube is vertically arranged to be hit by the injection medium, and due to dust and drainage in the injection medium, erosion occurs on the water wall tube surface in a fan-like manner.

As described above, in the prior art, insufficient consideration was given to preventing damage to the ice wall tube, and depending on the type of coal, the furnace ice wall tube may be seriously damaged, and an improvement in this problem has been desired.

In order to solve the above-mentioned problems, when the nozzle is inserted into the furnace and injection starts, a small-diameter nozzle hole is installed on the side near the furnace ice wall tube, and the nozzle hole is installed in the direction in which the nozzle is installed. Install it in a direction slightly away from the ice wall tube from the horizontal direction. The other nozzle hole has a larger diameter than the above-mentioned nozzle hole, and the nozzle hole position is arranged inside the furnace side by side with the above-mentioned small-diameter nozzle hole.

The small diameter nozzle serves the purpose of cleaning the vicinity of the soot blower and directing the jet from the convex diameter nozzle away from the ice wall tube near the soot blower so as not to apply a strong jet to the ice wall tube.

The jet from the large-diameter nozzle is responsible for cleaning the ice wall tube, which is farther away than the soot blower, due to the influence of the small-diameter jet and because it is located inside the furnace.

Furthermore, by moving the nozzle forward and backward while rotating during spraying, the jet stream hits the ice wall tube in a spiral manner, making it possible to effectively clean a wide range.

By arranging the large and small nozzle holes and the nozzle holes and moving them forward and backward during injection, it is possible to solve the problems of the prior art and provide a short-slip type soot blower with an expanded cleaning range.

<Objective of the Invention> The object of the present invention is to provide a soot blower that does not cause damage to the ice wall tube due to the drain in the steam pipe during startup and the steam and dust during soot blowing.

<Embodiment> Figs. 5 and 6 show installation diagrams of a conventional short-slip type soot blower. The nozzle 5' is located inside the wall sleeve 4' attached to the outside of the furnace water wall tube 2', and is waiting in a position pulled out to the outside of the furnace (indicated by the solid line in the figure) to protect it from the furnace heat. .

Feed screw 8' rotates through gear transmission due to the rotation of %-ta 7', and screw nut 9' screwed into feed screw 8 moves in the direction of valve body f-12' because its rotation is restrained by guide bar 14. Then, the shift lever 10' enters the notch and is reversed. The lower end of the shift lever 10' is fitted into the rear end flange of the outer tube 11', and the shift lever 10' has a swivel 7.
The outer tube 11' advances toward the inside of the furnace from the VC.

At a position where the nozzle hole 6 enters the furnace a little further than the wall surface of the furnace water wall tube 2, the screw nut 9' is removed from the notch of the shift lever 10', so that the nozzle 5' stops moving forward and only rotates. Pulp Pode 12' according to the timing of this time.
Since the valve is opened, the nozzle hole 6' is connected to the furnace water wall 2.
Rotate and clean while maintaining a constant distance from the machine.

FIG. 1 shows an installation diagram of a soot blower according to the present invention. The nozzle 5 has a small nozzle hole 16 and a large nozzle hole 17 (inside the furnace), and starts injection at positions 16α and 17α, 16b and 17b.
Rotate and move forward while injecting up to the position of
．． Move back to position 17 and wait.

The illustrated small nozzle hole 16α is arranged close to the furnace water wall tube 2 and directed slightly toward the inside of the furnace, so that the impact of the jet flow on the furnace ice wall tube 2 can be suppressed to a small level, thereby preventing damage to the ice wall tube.

Moreover, by installing the large nozzle hole 17 with a slight inclination toward the furnace water wall tube 2 side, the jet stream hits in a spiral shape, thereby making it possible to achieve a cleaning effect and expand the cleaning range.

FIG. 4 shows a link mechanism for opening the main valve, and the roller 15 attached to the gear box 18 moves the cam 19 at the point where the small nozzle hole 16 protrudes from the wall surface of the ice wall tube 2 into the furnace at 16 cL. The rod 20. is in contact with the bottom side 19cL of the rod 20. The main valve 12 is slightly opened by the arm 21, and the drain in the pipe connected to the main valve 12 is discharged.

The nozzle 5 then protrudes into the furnace, and the main valve 12 is fully opened at the position where the cam is indicated by the solid line in FIG. 4, stops advancing at the large nozzle hole 17b, and rotates to soot-plow the furnace wall.

Effect) The jet from the small diameter nozzle can prevent damage to the ice wall tube by weakening the jet from the large diameter nozzle that hits the water wall tube near the soot blower by moving it away from the ice wall tube.

Furthermore, the large-diameter nozzle hole arranged in the furnace away from the ice wall tube makes it possible to clean an area farther away than the soot blower.

Furthermore, by ejecting while inserting and removing the nozzle, the jet stream spreads in a spiral shape on the ice wall tube, making it possible to expand the cleaning range.

In addition, the drain in the pipe is located at the small nozzle hole 16α (large nozzle hole 1
7α), so it does not damage the ice wall tube.

Effect> When the nozzle is inserted into the furnace and injection begins, the small-diameter nozzle hole provided on the side closer to the ice wall tube of the furnace works to separate the jet from the large-diameter nozzle hole toward the inside of the furnace from the ice wall tube near the soot blower. Therefore, damage to the ice wall tube can be prevented. Furthermore, the large-diameter nozzle hole located inside the furnace allows cleaning of areas far from the soot blower.

In addition, since the soot blower moves forward while spraying, the jet stream hits the ice wall tube in a spiral direction away from the center of the soot blower, thereby preventing water wall tubes and expanding the cleaning range.

Furthermore, the discharge of piping drain by slightly opening the main valve is extremely effective in preventing damage to the water wall pipes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a device according to an embodiment of the present invention;
Fig. 2 is a longitudinal cross-sectional view of the gear box 18, Fig. 3 is a perspective view schematically showing the operation of the soot blower of the present invention, Fig. 4 is a link mechanism for the main valve, and Fig. 5 is a longitudinal cross-section of an example of a conventional soot blower. 6 is a perspective view schematically showing the operation of the soot blower shown in FIG. 5. 5... Nozzle 7... Motor 8... Feed screw 11... Acta tube 12... Main valve 13... Inner tube 16 (16 cL, 16&)... Small nozzle hole 17
(17α, 176)...Large nozzle hole 19...Cam
20・°°rod 21...Arm figure 3

Claims (1)

[Scope of Claims] 1. A gearbox is provided in which the parallel helical shaft and the outer tube are geared together, and the gearbox is inserted coaxially with the outer tube and is positioned in an airtight manner with the outer tube. A main valve is provided at the rear end of the inner tube, a nozzle at the tip of the outer tube is provided with a large nozzle hole and a small nozzle hole spaced apart from the tip side, and the outer tube is rotated and advanced by a motor drive, When the roller connected to the gearbox contacts the cam and the small injection hole enters the inside of the furnace from the boiler wall, the main valve for the injection steam is slightly opened, and then the outer valve is opened at the position where the nozzle most protrudes into the furnace. A soot blower characterized in that a link mechanism is provided that stops the forward movement of the tube and fully opens the main valve. 2. Claim 1, characterized in that a link mechanism is constituted by a cam (19), a rod (20), and an arm (21).
Soot blower as described in section.