JP3073356B2 - Sootblower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soot blower, and more particularly to an improvement of a stationary rotary soot blower provided in a denitration apparatus.

[0002]

2. Description of the Related Art FIG. 7 is a diagram illustrating a soot blowing state by a conventional stationary rotary soot blowing device. Outer walls of denitration equipment (2)
An injection pipe (5) having a plurality of nozzle holes (5a) on its side face is inserted in advance, and is supported by a support (6). While rotating the injection pipe (5) via a rotation mechanism, an injection medium such as steam supplied through the head valve (7) is injected from the nozzle hole (5a) and adheres to the denitration catalyst (3). Alternatively, the deposited soot is removed.

As shown in the drawing, the rotation mechanism of the injection pipe (5) transmits the rotation of a motor (not shown) to the gears (10) and (11) via a rotation shaft (9). 5) is rotated. A valve opening / closing cam (12) is fitted to the injection pipe (5).
The cam follower (13) is in contact with 2). Then, the valve opening / closing cam (12) rotates together with the injection pipe (5) to operate the cam follower (13) at a predetermined rotation angle, and the valve stem (7) via the interlock (14).
By moving a), the head valve (7) is opened and closed, and the jet medium fed from the feed pipe (8) is appropriately supplied to the jet pipe (5). In addition, the limit switch (16) is operated by an interlock (15) attached to the injection pipe (5), and the rotation of the injection pipe (5) can be stopped at an arbitrary angle position.

[0004]

The high-temperature gas G flowing in the outer wall (2) gradually decreases in temperature while performing a heat exchange operation in a heat exchanger (not shown) provided upstream, and flows downstream. . Therefore, the injection pipe (5), which is installed on the downstream side and is not being injected, is maintained at a low temperature under the influence of the low-temperature gas. When the high-temperature and high-pressure injection medium is supplied into the low-temperature injection pipe (5) , the injection medium is cooled,
Part of it condenses to drain. The drain is mixed with the gas phase injection medium and injected into the denitration catalyst, and reacts with soot attached or deposited on the inner surface of the denitration catalyst to solidify the soot. As a result, there has been a problem that the gas passage is blocked, the gas flow is deteriorated, and the denitration effect is reduced.

[0005]

According to the present invention, in order to solve the above-mentioned conventional problems, an injection pipe arranged in a denitration apparatus is provided on a side surface of the injection pipe while rotating the injection pipe about an axis. In a soot blowing device that injects an injection medium from a plurality of nozzle holes to remove dust adhering in the denitration catalyst of the denitration device, in a direction without the denitration catalyst when viewed from the axis of the injection pipe, and in the same injection Injected from the nozzle hole near the pipe
A position the injection medium which is blown, the drain cut plate is provided along the axial direction of the injection pipes Rutotomoni, the nozzle
At the position where the hole faces the drain cut plate,
Limit switch for controlling temporary stop, and
The present invention proposes a soot-blowing apparatus characterized in that a cam mechanism for controlling the ejection of the ejection medium from the nozzle hole is provided .

[0006]

In the present invention, when the soot blowing device is started to start the soot blowing operation, the noise is controlled by a limit switch.
The rotation of the injection pipe is temporarily stopped at a position where the drain hole faces the drain plate, and the injection medium containing the drain is injected toward the drain plate to perform drain cutting. After that, the injection pipe is rotated, and a cam mechanism consisting of a cam and a cam follower is used.
By controlling , the injection medium is injected from the nozzle hole to the denitration catalyst to perform soot blowing. Therefore, it is possible to prevent the drain from being injected into the denitration device.

[0007]

1 is a plan view showing a first embodiment of the present invention, and FIG. 2 is a side view thereof. FIG. 3 is an enlarged view showing a main part of FIG. In these figures, the same parts as those of the related art described with reference to FIG. 7 are denoted by the same reference numerals to avoid redundancy, and detailed description thereof will be omitted.

In this embodiment, a plurality of vertical injection pipes (5) of a soot blowing device (4) are provided in the vicinity of a denitration catalyst (3) installed in two stages in the outer wall of the denitration device (1). It is arranged in the lateral direction, in a direction without the denitration catalyst (3) to be blown when viewed from the rotation axis of each of the injection pipes (5) (direction deviated by 90 ° in the figure), and near the injection pipe (5). In each position, a vertical drain plate (17) is provided over substantially the entire length of the injection pipe (5). Both ends (17a) of the drain cut plate (17) are bent toward the injection pipe (5) to form a groove.

Next, FIG. 4 shows a valve opening / closing cam (1) used when opening and closing the head valve of the soot blowing apparatus of this embodiment.
2) shows an example of the shape of FIG.
A closed cam portion (12b) having a rotation angle of 180 ° is formed similarly to the open cam portion (12a) of 0 °, and the cam follower (13)
Is contacted and installed.

The valve opening / closing cam (12) is fitted to the injection pipe (5) and rotates integrally. The head valve is opened to supply the ejection medium while the open cam portion (12a) is in contact with the cam follower (13), and the head valve is closed and the supply of the ejection medium is stopped while the closed cam portion (12b) is in contact. Works as follows. By turning off the limit switch (16) with the engaging member (15), the rotation of the injection pipe (5) can be stopped as in the conventional one described with reference to FIG.

In such an apparatus, FIG. 3 and FIG.
As shown in Fig. 7, when the apparatus is started, the injection pipe (5) and the valve opening / closing cam (12) rotate and the open cam portion (12a) starts to contact the cam follower (13), the head valve opens and the injection medium is discharged. It is supplied to the injection pipe (5), but when the nozzle hole (5a) faces the direction of the drain plate (17),
That is, when the point reaches, for example, the point A in the range of the angle β, the limit switch is turned off to temporarily stop the injection pipe (5). Then, the injection medium containing the drain is sprayed on the drain cutting plate (17), and only the drain is drained from the drain cutting plate (1).
7) Fall along the inner peripheral wall. When draining is completed in this manner, the limit switch is turned on to rotate the injection pipe (5) again, whereby the injection medium containing no drain is injected toward the denitration catalyst (3) over the range of the angle α. Thus, appropriate soot blowing is performed.

Next, FIG. 5 shows a second embodiment of the present invention.
It is a side view which shows the installation condition of the soot blowing apparatus when gas G flows from the lower part to the upper part in the outer wall (2) of a denitration apparatus. In this case, the horizontal injection pipe (5) is provided below the denitration catalyst (3) (upstream of the gas flow G), and the drain cut plate (27) is provided further below the injection pipe (5). . In the same manner as described above, first, the injection medium containing drain is injected toward the drain cutting plate (27) to perform drain cutting, and then the injection pipe (5) is rotated to perform soot blowing on the denitration catalyst (3).

FIG. 6 is a side view showing a third embodiment of the present invention, in which a soot-blowing device is installed when gas G flows from above to below in the outer wall (2) of the denitration device. In this embodiment, a drain plate (37) is provided on the side of the horizontal injection pipe (5) disposed above the denitration catalyst (3) (upstream of the gas flow G). In the same manner as described above, first, the injection medium containing drain is injected toward the drain cutting plate (37) to perform drain cutting, and then the injection pipe (5) is rotated to perform soot blowing on the denitration catalyst (3).

The drain cutting plates (27) and (37) of the second and third embodiments are provided with a slight inclination with respect to the horizontal, and the drain is drained by the drain cutting plates (27) and (3).
7) It flows inside and flows down along the inner surface of the outer wall (2).

[0015]

As described above in detail, in the soot blowing apparatus of the present invention, before starting the apparatus and starting the soot blowing operation, the rotation of the injection pipe is temporarily stopped, and the injection medium containing the drain is discharged. After injecting toward the drain cutting plate to perform drain cutting, the injection pipe was rotated to inject the injection medium of only the gas phase without drain to the denitration catalyst which is the soot blowing object, As in the conventional case, soot is not solidified by drain in the denitration catalyst, and good and appropriate soot blowing can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is an enlarged view showing a main part of FIG. 1;

FIG. 4 is a diagram showing an example of a shape of a cam for opening and closing the head valve of the embodiment.

FIG. 5 is a side view showing a second embodiment of the present invention.

FIG. 6 is a side view showing a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a soot blowing state by a conventional stationary rotary soot blowing device.

[Explanation of symbols]

 (1) Denitration equipment (2) Outer wall (3) Denitration catalyst (4) Soot blowing equipment (5) Injection pipe (5a) Nozzle hole (6) Support (7) Head valve (7a) Valve stem (8) Feed pipe (9) Rotary shaft (10), (11) Gear (12) Valve opening / closing cam (13) Cam follower (14), (15) Interlock (16) Limit switch (17), (27), (37) Drain Cutting plate G Gas flow

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23J 3/00 F28G 1/16 F28G 3/16

Claims (1)

(57) [Claims] 1. A denitration catalyst for a denitration apparatus, wherein an injection medium is jetted from a plurality of nozzle holes provided on a side surface of the injection pipe while rotating an injection pipe disposed in the denitration apparatus around an axis. In a soot blowing device for removing dust adhering to the inside, a jet injected from the nozzle hole in a direction where the denitration catalyst does not exist when viewed from an axis of the injection pipe and in the vicinity of the injection pipe.
On the position to be attached morphism medium blows, Rutotomoni provided drain cutting plate in the axial direction of the injection pipe, the nozzle hole
Stop the rotation of the injection pipe at the position facing the drain cut plate.
Limit switch to control the stop
A soot blowing device comprising a cam mechanism for controlling the ejection of the ejection medium from the ejection device.