JPS583165B2 - Soot blower device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soot blower device that increases the removal rate of deposits.

BACKGROUND ART In industrial and commercial boilers, there is a noticeable problem in which particles in the exhaust gas adhere to heat transfer surfaces, reducing the heat transfer efficiency of the boiler, increasing draft pressure loss, and reducing operating efficiency.

Therefore, as a means to remove the flying debris adhering to the heat transfer surface, a soot blower device as shown in Figure 1 is generally installed near the heat transfer surface, and saturated steam or compressed air is periodically injected to eliminate the above-mentioned problem. The points had been resolved.

A nozzle 20 is formed at the tip of the tubular body 10a constituting the main body of the cyst blower, and an injection gas consisting of saturated steam or compressed air is injected from the nozzle 20 to remove deposits.

However, in recent years, as poor quality oil or coal fuel has been used, there has been an increase in dirt on heat transfer surfaces, and on heat transfer surfaces in high-temperature areas, particles in the exhaust gas are causing compositional changes and melting. , the adhesion force of deposits tends to increase.

Therefore, in the soot blower device described above, it is difficult to remove deposits attached to the heat transfer surface.

Furthermore, in order to improve the removal rate of deposits, it is necessary to increase the pressure of the injection medium, but this increases the consumption of injection gas, which is uneconomical and also shortens the life of the soot blower itself.

An object of the present invention is to provide a soot blower device that can eliminate the above-mentioned problems and increase the removal rate of deposits without increasing the pressure of the jet.

In short, this invention has a soot blower main body with a double-tube structure, and a jet gas containing powder particles with a high melting point, such as fine particles of sand, passes through the inner pipe, and the particles and the jet gas are injected from a nozzle part. This device effectively removes deposits using the particle erosion effect.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 2, inside the outer tube 10 constituting the soot blower body, there is an inner tube 30 that makes the central axis of the outer tube 10 substantially the same.
is placed.

A powder injection nozzle 40 is formed at the tip of the inner tube 30 so as to be substantially perpendicular to the inner tube 30, and this nozzle 40 opens approximately at the center of the outer nozzle 20 formed in the outer tube 10. ing.

Reference numeral 33 denotes a support rod attached to the tip of the nozzle 40 forming portion, and this support rod is further supported by the mounting seat 32, so that the inner tube 30 is indirectly supported by the outer tube 10.

31 is a ring that similarly supports the inner tube 30.

In this device, an injection gas 2 such as saturated steam or compressed air containing fine inorganic particles and powder having a melting point of at least 1200°C, such as silica sand, ceramics, and coal ash, is passed through the inner tube 30. .

On the other hand, the injection gas 1 that does not contain these particles is passed through the outer tube 10.

The injected gas 2 containing fine particles is injected from the nozzle 40, and the injected gas 1 is injected from the outer nozzle 20. Due to the high jetting force of these two injected gases, the fine particles violently hit the surface on which the deposits are attached, and the erosion effect causes the deposits to be removed. Remove effectively.

In addition, in this device, in order to prevent the powder from being ejected into the outer tube, when the soot blower device is operated, the injection gas 1 is injected and then the injection gas 2 is injected, and on the other hand, when the device is stopped, the injection gas 2 is stopped. After that, the injection of the injection gas 1 is stopped.

FIG. 3 shows another embodiment, in which the injection nozzle tip 40a is screwed into the injection nozzle base 40b connected to the inner pipe 30, and the nozzle tip, which is subject to severe wear, is replaceable. be.

FIG. 4 shows yet another structure of the tip of the inner tube, and shows a cross section of the tip nozzle fitting 41, which is constructed to facilitate the flow of particles.

By carrying out this invention, the efficiency of removing deposits can be increased, and the heat transfer efficiency of boilers and the like can be improved.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view of a conventional soot blower, Fig. 2 is a partial cross-sectional view of a soot blower according to the present invention, Fig. 3 is a detailed cross-sectional view of a powder injection nozzle, and Fig. 4 is a cross-sectional view of a tip nozzle fitting. It is a drawing. 10...Outer pipe, 20...Outer nozzle, 30...Inner pipe, 40...Powder injection nozzle, 40a...Powder Body injection nozzle tip, 4
0b...Powder injection nozzle base, 41...
・Tip nozzle fitting.

Claims (1)

[Scope of Claims] 1. A soot blower device characterized in that a pressure gas ejection nozzle provided on an outer tube and a nozzle for ejecting high melting point powder and granules are provided coaxially. 2. An outer tube, an inner tube arranged so that its central axes are approximately the same in the outer tube, a powder jetting nozzle provided at the tip of the inner tube, and an outer tube arranged so that the powder jetting nozzle is located almost coaxially. 2. The soot blower device according to claim 1, wherein the soot blower device comprises an outer nozzle formed in the inner tube so that the powder and granular material for removing high melting point deposits passes through the inner tube together with the injection gas. 3. The soot blower device according to claim 1 or 2, wherein the powder is an inorganic substance having a melting point of 1200° C. or higher. 4. Any one of claims 1 to 3, characterized in that the tip of the powder injection nozzle is configured to be replaceable by screwing the tip into the base of the powder injection nozzle. The soot blower device described.