JP2564176Y2 - Jet flushing device for hot side element in air preheater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for jet washing a high-temperature element in an air preheater.

[0002]

2. Description of the Related Art In a boiler plant, an air preheater is used in order to recover heat of boiler exhaust gas and reduce heat energy.

[0003] Such an air preheater is shown in FIG. 6, wherein 1 is an annular stator supported on a gantry 2, 3 is a high-temperature side element having a large number of through-holes disposed above and inside the stator 1, Is a low-temperature element having a large number of through-holes disposed below the inside of the stator 1; 5 is a rotatable main shaft extending vertically through a central portion of the stator 1; , An air inlet side hood having a butterfly shape in plan view, 7 is disposed above the high temperature side element 3 and fixed to the main shaft 5, an air outlet side hood having a butterfly shape in plan view, 8 is an air inlet Side hood 6, spindle 5,
A driving device for driving the air outlet side hood 7;
Inlet duct for sending air to the air inlet side hood 6, 11 is an air outlet duct for sending the preheated air 12 from the air outlet side hood 7 to the boiler, and 13 is a high temperature side element 3 for transferring the hot gas 14 discharged from the boiler. And a gas inlet duct 15 for supplying the low-temperature side element 4, and a gas outlet duct 15 for discharging the low-temperature gas 16 from the low-temperature side element 4.

When preheating the air, the drive unit 8 rotates the air inlet side hood 6 and the air outlet side hood 7, and the hot gas 14 passes from the gas inlet duct 13 to the outside of the air outlet side hood 7. The high-temperature side element 3 is heated to be introduced into the high-temperature side element 3 and is then introduced into the low-temperature side element 4.
To the gas outlet duct 15 as low-temperature gas 16
Is sent downstream.

On the other hand, the air 10 is introduced from the air inlet duct 9 through the air inlet side hood 6 to the low temperature side element 4, heated by the heat of the low temperature side element 4 and introduced into the high temperature side element 3, It is further heated by the heat of the side element 3 and sent out into the air outlet side hood 7,
The air passes through the air outlet side hood 7 and the air outlet duct 11 and is supplied to the boiler as preheated air 12.

Accordingly, the gas 14 introduced into the air preheater is
Since ash and dust generated by the combustion of fuel in the boiler are contained in the inside, when the gas 14 passes through the high-temperature side element 3 and the low-temperature side element 4, the ash and dust Adhering to the side element 4, the through holes of the high temperature side element 3 and the low temperature side element 4 are closed.

When the high-temperature side element 3 and the low-temperature side element 4 are closed, it is most effective to perform jet water washing with high-pressure water. Therefore, conventionally, as shown in FIG. A rail 18 fixed to the hood 6 and extending horizontally in the radial direction of the low-temperature side element 4, a nozzle truck 19 movable along the rail 18, and a nozzle truck 1
A jet water washing device 17 including a plurality of nozzle bodies 20 and the like, which are mounted upward on the nozzle 9, is used.

In such a jet water washing device 17, the nozzle carriage 19 rotates once with the air inlet side hood 6 in a state of stopping with respect to the rail 18, while the nozzle body 20
When high-pressure water is sprayed toward the low-temperature side element 4 and the low-temperature side element 4 and the high-temperature side element 3 are washed with water in the circumferential direction, and the nozzle bogie 19 makes one rotation, the nozzle bogie 19 is replaced with appropriate means. Is moved along the rail 18 by a small amount, and the low-temperature side element 4 and the high-temperature side element 3 are washed with water in the circumferential direction at the next position.

[0009]

However, in the above-described jet water washing apparatus, the element composed of the high-temperature side element 3 and the low-temperature side element 4 is vertically moved 3 times.
When the number of layers is more than the number of layers, it is difficult for high-pressure water to reach above the element, and there is a problem that the washing effect is reduced.

The present invention has been made in view of the above-mentioned circumstances, and has as its object to enable the element to be washed with water from above the high-temperature side element.

[0011]

According to the present invention, a rail extending in the radial direction of the high-temperature side element is mounted on an air outlet side hood which is rotatably mounted in a horizontal direction above the high-temperature side element. A carriage having a carriage body capable of moving along a rail and a nozzle carriage having a nozzle body mounted on the carriage body and capable of spraying high-pressure water toward a high-temperature-side element located below are suspended from the rail, A nut attached to the upper surface of the bogie main body is screwed to a screw shaft attached to the upper surface of the rail in parallel, and an engaging piece projected from the gas inlet duct side to the outer peripheral end of the high-temperature side element of the screw shaft. The wheel is provided with an impeller that is adapted to rotate.

[0012]

The nozzle truck rotates with the air outlet side hood and sprays high-pressure water from the nozzle body to the high-temperature side element located below. Therefore, the high-temperature side element can be jet-washed from above the high-temperature side element.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 5 show an embodiment of a jet water washing apparatus for a high-temperature side element in an air preheater according to the present invention. Behind the rotation direction D _{1 of} the air outlet side hood 7 provided above the high temperature side element 3, the stator extends from the main shaft 5 side in the radial direction of the high temperature side element 3 along the edge of the air outlet side hood 7. A rail 21 having an I-shaped cross section extending to one side is horizontally disposed, and the front and rear ends of the rail 21 have rail supports 22 and 23 projecting from the air outlet side hood 7.
It is connected to.

On the top surface of the front and rear ends of the rail 21, bearings 24,
A screw shaft 26 is horizontally and rotatably fitted to the bearings 24 and 25.

As shown in FIG. 3 and FIG. 4, a nozzle carriage 27 is mounted on the rail 21 so as to be freely movable. The nozzle carriage 27 includes side plates 28a arranged on both sides in the width direction of the rail 21 and a bottom plate 28 located below the rail 21 and arranged to connect the left and right side plates 28a.
b, and a bogie main body 28 formed of support plates 28c separately attached to upper ends of left and right side plates 28a, respectively.
Four guide rollers 30 that are rotatable via horizontal shafts 29 at required intervals in the front-rear direction are attached to the left and right side plates 28a of the bogie main body 28. It is capable of rolling. Bearings 31 are attached to the outer lower portions of the left and right side plates 28a at predetermined intervals in the front-rear direction, and the upper ends of the rails 21 are provided in the middle of a horizontal shaft 32 rotatably fitted to the left and right bearings 31. A support roller 33 is attached so as to be able to contact the lower surface of the lower flange 21a.

On the left and right support plates 28c of the bogie main body 28, there are provided left and right columns 34a and connection plates 34b for connecting the left and right columns 34a, and a nut holding frame having a substantially gate shape when viewed from the longitudinal direction of the rail 21. 34 is installed so as to straddle the screw shaft 26, and is provided on the lower surface of the connection plate 34 b of the nut holding frame 34 at predetermined intervals in the longitudinal direction of the screw shaft 26.
The nut holding plates 35 are fixed, and a nut 36 screwed to the screw shaft 26 is clamped between the nut holding plates 35. Further, a rotation preventing pin 37 is attached to the nut 36 so as not to rotate together with the screw shaft 26 when the screw shaft 26 rotates.

The bottom plate 28b of the bogie body 28 is connected to a nozzle header 40 having a high-pressure hose connection port 38 on the left and right and a plurality of nozzle bodies 39 on the lower part. A high-pressure hose 41 for supplying pressure is connected.

An impeller 42 is attached to the end of the screw shaft 26 on the stator 1 side. As shown in FIG. 5, the impeller 42 has a boss 4 fitted to the end of the screw shaft 26 on the stator 1 side.
3 and a plurality of rod-shaped blades 44 radially attached to the outer periphery of the boss 43. A plurality of rods that engage with the blades 44 of the impeller 42 and rotate the impeller 42 at predetermined intervals in the circumferential direction are provided on the inner peripheral portion of the gas inlet duct 13 immediately above the high-temperature side element 3. An engagement piece 45 is attached.

In the figure, 46 is a header support projecting from the roof of the air outlet side hood 7, 47 is a high pressure header attached to the header support 46 and connected to the high pressure hoses 41 and 48, 49 is an air outlet side hood. 7 is a hollow shaft provided at the center of rotation and connected to the upper end of the main shaft 5. A steam supply pipe 50 is inserted into the hollow shaft 49 from the lateral direction and through which the high-pressure hose 41 is inserted.
1 is a rotary joint attached to the upper end of the hollow shaft 49, 52 is a rotary joint 51 connected to the high-pressure hose 48 and is a high-pressure hose for sending high-pressure water supplied from outside, and 53 and 54 are hose support out of the air outlet side hood 7 Zhang, D ₂ is the rotational direction of the impeller 42.

When high-pressure water is blown from above the high-temperature side element 3 onto the high-temperature side element 3, the air outlet side hood 7 is rotated by the rotation of the main shaft 5, and the hollow shaft 49, the steam supply pipe 50, the rotary joint also rotate a portion of the 51, these rotation rotates the jet rinsing device 17 of the high-temperature side element in an air preheater of the present embodiment is also the rotational direction D ₁ of the Figure 1 with the air outlet hood 7, etc. I have.

The high-pressure water introduced from the outside into the high-pressure hose 52 passes through the rotary joint 51, the high-pressure hose 48, the high-pressure header 47, and the high-pressure hose 41, and passes through the nozzle header 40 attached to the nozzle carriage 27. Introduced and sprayed from the nozzle body 39 toward the high-temperature side element 3,
The high-temperature side element 3 is jet-washed.

[0023] During jet washing device 17 for substantially one rotation in the rotation direction D ₁ of the Figure 1 together with the air outlet hood 7, the position with respect to the rail 21 of the nozzle carriage 27 is constant position.
However, when the blades 44 of the impeller 42 attached to the screw shaft 26 rotate substantially one turn and engage with the engaging pieces 45 protruding from the inner periphery of the gas inlet duct 13, the impeller 42 rotates in the rotational direction of FIG. is pivoted in the D _2, threaded shaft 26 is also rotated in the same direction. Therefore, the nut 36 attached to the carriage body 28
Is sent in a fixed amount in the longitudinal direction of the screw shaft 26,
As a result, the nozzle header 40 and the nozzle body 39 are also fed by a fixed amount in the longitudinal direction of the screw shaft 26. Thus, during the next round, the nozzle carriage 27 is held at a fixed position with respect to the screw shaft 26 and the rail 21, and high-pressure water is sprayed from the nozzle body 39 onto the high-temperature side element 3.

As described above, in the jet flushing device for the high-temperature side element in the air preheater of the present embodiment, the position of the nozzle carriage 27 with respect to the rail 21 is constant while the air outlet side hood 7 makes one rotation. Since the nozzle carriage 27 is moved along the rail 21 by a small amount when it rotates, the nozzle carriage 27 is sequentially fed from the stator 1 side to the main shaft 5 side for each rotation of the air outlet side hood 7, thereby increasing the temperature. Jet water washing of the entire side element 3 can be performed.

When the nozzle carriage 27 moves along the rail 21, the guide roller 30 rolls on the upper surface of the lower flange 21a of the rail 21. Further, a reaction force generated when high-pressure water is blown from the nozzle body 39 causes the nozzle bogie 27 to move.
If the support roller 33 rises,
The nozzle carriage 27 does not come off the rail 21 because the nozzle carriage 27 comes into contact with the lower surface of the lower flange 21a.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0027]

According to the jet washing device for the high-temperature element in the air preheater of the present invention, the jet washing of the element of the air preheater can be performed from above the high-temperature element. Even when the number is large, there is an excellent effect that the blockage of the element can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a jet water washing device for a high-temperature side element in an air preheater of the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is an enlarged side view of a nozzle bogie in the jet flushing device for the high-temperature side element in the air preheater of the present invention.

4 is a view in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a view in the direction of arrows VV in FIG. 2;

FIG. 6 is a longitudinal sectional view showing an outline of an air preheater and an installation position of a conventional jet water washing device.

[Description of Signs] 3 High-temperature side element 7 Air outlet side hood 13 Gas inlet duct 21 Rail 26 Screw shaft 27 Nozzle bogie 28 Bogie main body 36 Nut 39 Nozzle main body 40 Nozzle header 42 Impeller 45 Engagement piece

Claims (1)

(57) [Scope of request for utility model registration] 1. A rail extending in a radial direction of a high-temperature side element is mounted on an air outlet side hood mounted rotatably in a horizontal direction above a high-temperature side element so that the rail can move along the rail. And a nozzle bogie equipped with a nozzle main body mounted on the bogie main body and capable of spraying high-pressure water toward a high-temperature-side element positioned below, was suspended, and mounted on the upper surface of the rail in parallel with the rail. A wing screwed with a nut attached to the upper surface of the bogie main body to the screw shaft, and rotated at the outer peripheral end of the high-temperature side element of the screw shaft by an engagement piece projected from the gas inlet duct side. A jet flushing device for a high-temperature side element in an air preheater to which a car is attached.