JPH055515A - Insertion type equipment for blowing away soot - Google Patents

Abstract

PURPOSE:To improve insertion type equipment for blowing away soot which has a construction wherein a lance tube is inserted into a combustion chamber and a high-pressure gas is blown off from a nozzle provided at the fore end against a deposit sticking on the inner surface of the chamber so that the deposit removed. CONSTITUTION:A rack 6 moving forward and backward with a lance tube 15 and a long shaft 9 rotating the lance tube 15 are connected to two output shafts of a differential gear device 34 and driven, while the rotation and the linear motion of the lance tube 15 are restricted in prescribed ranges respectively. According to this constitution, the lance tube is inserted first into a combustion chamber at a high speed without rotation and then it stops a forward motion and rotates at a high speed, jetting a gas. Accordingly, the time when the fore end of the lance tube is exposed to a high temperature is short, and therefore it is not overheated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a slip-on type soot blowing device.

[0002]

2. Description of the Related Art As shown in the right half of FIG. 6, a slip-on type sootblower device is inserted into a combustion chamber such as a heat exchanger to form a wall surface (22).
The high-pressure air or steam is blown onto the deposit (23) adhering to the heat absorption part (24) (water cooling chamber pipe, etc.) adjacent to the heat absorption part (24) to remove it, and the heat absorption part (24) absorbs heat. This is a device for promoting heat recovery and improving the efficiency of heat recovery.

An example of a conventional slip-on type sootblower is shown in FIG. In the figure, (013) is a head valve,
The head valve (013) supplies and shuts off the injection medium (air or steam). The jet medium is jetted from a nozzle provided at the tip of the lance pipe (015) via the supply pipe (014). Lance tube (015)
It moves in the axial direction and at the same time rotates to remove the deposit (23) deposited on the surface of the heat absorbing part (24).

The lance tube (015) is driven as follows. That is, the rotation of the power source (01) is reduced by the gear box (02), and the gears (03), (04), (0
Rotate the lead screw (06) via 5).
The lead screw (06) moves the gear box (08) in the axial direction. Further, in the gear box (08), the lance pipe (015) and the gear (012) are directly connected, and the lance pipe (015) moves in the axial direction in conjunction with the gear box (08). On the other hand, the rotation of the lance tube (015) is performed by a long key groove (not shown) provided over the entire length of the lead screw (06), a gear (011), and a gear (0).
This is done by rotating 12).

The supply and cutoff of the injection medium are performed by the head valve (013) as described above. The valve (013) is opened and closed when the gear box (08) moves in the axial direction. Dog (016) provided in (08)
The valve opening / closing cam (017) is operated by the valve lever (019), (020) via the connecting rod (018).
Is carried out. That is, when the dog (016) provided in the gear box (08) reaches the point P, injection is started, and further movement (forward movement) in the axial direction is continued to reach the point Q, the power source (01) The engine reverses and moves in the reverse direction, and when the point P is reached again, the injection ends (from point R to point S in FIG. 6).
Injection is performed within the range up to the point).

[0006]

The conventional slip-on type sootblower has the following drawbacks. 1) Since the lance pipe (15) moves forward and backward while ejecting and rotating in the axial direction, imbalance occurs in the soot removal force (momentum) within the range from the R point to the S point. That is, at the R point and the S point, the distance between the nozzle and the heat absorbing surface is different, and the peripheral speed at the arrival surface of the jet medium is also different. Therefore, imbalance occurs in the soot removing effect. 2) The lance tube (015) rotates several times while moving in the range from the R point to the S point. Therefore, since the injection angle cannot be limited, even if it is necessary to avoid injection in the burner, the combustion chamber corner portion, etc., it cannot be done. 3) It takes a long time for the lance tube (015) to reach the R point from the T point, and the lance tube (015) is exposed to high-temperature gas and is overheated before the R point reaches the R point. When the point R is reached, the injection medium flows in, so the lance pipe (01
The tip of 5) may be rapidly cooled (under a thermal shock) and the nozzle may be damaged. 4) Since the moving range of the lance pipe (015) (from point T to point S) is long, the entire apparatus becomes long and a wide installation space is required. 5) As described in the item 1), the soot removal performance is poor, and the injection time is long and the consumption of the injection medium is large. 6) As related to the item 2), since the high temperature injection medium is injected at a predetermined angle to the heat absorbing section (tube) after soot removal,
The heat absorbing part (tube) is easily damaged by heat.

[0007]

In order to solve the above-mentioned conventional problems, the present invention engages with a lance tube having an injection nozzle at its tip which is substantially vertical to the axis, and a pinion arranged parallel to the lance tube. And a support plate fixed to the rack for supporting the lance tube freely in rotation and restraining axial movement, and arranged in parallel with the lance tube, and freely rotatable and axial by the support plate. A long shaft movably supported, an input shaft connected to a rotary drive source, one of the outlet shafts connected to the pinion, the other to the long shaft, a differential gear unit connected to the pinion, and a long shaft of the long shaft. Means for transmitting rotation to the lance tube, means for restraining rotation of the long axis when the lance tube is behind the predetermined position, and prevention of movement of the lance tube forward of the predetermined position And the lance tube It proposes a tuning slide type Susu吹 apparatus characterized by comprising a means for feeding the injection medium to the lance tube when in position.

[0008]

Since the slip-on type soot blowing device of the present invention has the above-mentioned structure, the lance tube does not rotate with the advance of the rack and advances at a high speed to the vicinity of the wall surface of the combustion chamber and stops. The jet medium can be jetted in parallel to the heat absorbing portion (tube) while rotating with the rotation of the long axis at the position. Therefore, since the lance tube tip is exposed to high temperature gas for a short time, it is not overheated, and since it is a parallel injection, there is no risk of damaging the tube surface, and the soot removal force is averaged to achieve an efficient soot removal effect. can get.

[0009]

1 is a plan view showing an embodiment of the present invention, FIG.
Is also a side view, FIG. 3 is an enlarged perspective view of the link mechanism (25) in FIG. 2, FIG. 4 is a view taken along the line IV-IV in FIG. 1, and FIG.
FIG. 5 is a view taken along the line V-V in FIG. 1.

In these figures, (15) is a lance pipe, and (6) is a rack arranged in parallel with the lance pipe. A support plate (10) is fixed to the rack (6),
The lance tube is rotatably supported by the support plate (10). Open / close cam (16) and sprocket (20)
Are fixed to the lance tube (15) with both sides of the support plate (10) sandwiched therebetween. The rack (6) has a pinion (1
1) meshes with each other, and the pinion (6) is driven by the rotation of the gear motor (1), which is a drive source, to drive the pulley (2) and the V (V).
It rotates via the belt (2), pulley (3), worm (4), worm gear (5), and differential gear (32).
Then, the rack (6) and the lance tube (15) move linearly in the longitudinal direction.

In the lance pipe (15), there is a supply pipe (14).
Is loosely fitted, high-temperature and high-pressure injection medium (air, steam, etc.) is supplied through the head valve (13) and the steam pipe (31), and is perpendicular to the axis at the tip of the lance pipe (15). It is designed to be ejected from the opened nozzle (15a).

The other output shaft of the differential gear (32) is connected to the worm (7) and the worm gear (8), and a long shaft (square shaft) having one end fitted to the worm gear (8). It transmits the rotation to (9) and is used for rotation of the lance tube (15). The area surrounded by the chain double-dashed line in FIG. 1 constitutes the differential gear device (34). Square shaft (9)
The other end of is rotatably supported by the support plate (10) and has a sprocket (19) attached thereto.
This sprocket (19) and the sprocket (20)
A chain (17) is wound between and. Both the support plate (10) and the sprocket (19) are movable in the longitudinal direction with respect to the square shaft (9).
A moving plate (18) is also attached to the end of the square shaft (9) so that it can move integrally with the supporting plate (10). The tip of the moving plate (18) is shown in FIG. As shown, it is laterally movably engaged with the guide (21).

The opening / closing cam (16) fixed to the base of the lance tube (15) is provided with a notch (16a), while the head valve (13) is provided with a link mechanism (25). Then, the notch (16a) of the opening / closing cam (16) and the cam follower (25a) of the link mechanism (25) are engaged by the axial movement of the lance pipe (15), and then the lance pipe (15) rotates. Head valve (13)
Is opened and closed to supply and block the injection medium.

The stopper (29) regulates the forward position of the rack (6) (that is, the lance pipe (15)). When the lance pipe (15) advances by a predetermined stroke L, the tip of the rack (6) stops. Abutting against (29), the forward movement is blocked. And at this position, the opening / closing cam (16)
The notch (16a) and the cam follower (25a) of the link mechanism (25) are just engaged.

Operation of the soot blowing device as described above (soot blowing operation)
Will be described next. Lance tube (15) before the start
The nozzle (15a) is located at the position A outside the combustion chamber, and the head valve (13) is closed. In addition, the moving plate (1
8) is fitted with the guide (21) and is in a state where rotation is restricted.

When the gear motor (1) is driven by the start command, its rotation drives the pinion (11) via the worm (4), the worm gear (5) and the differential gear (32) as described above. In addition, the worm gear (8) is driven from the worm (7) through the differential gear (32) to rotate the square shaft (9). However, at this time, as shown in FIG. 4, the groove (18a) of the moving plate (18) fitted with the square shaft (9) is guided by the guide (21).
, The rotation of the square shaft (9) is restricted. Therefore, due to the characteristics of the differential gear (6), the rotation of the output shaft on the pinion (11) side is increased to a predetermined speed, and the lance pipe (15) moves forward at high speed with the rack (6). At this time, the square shaft (9) side (moving plate (18), sprocket (19)) moves in conjunction with the lance tube (15) via the supporting plate (10) without rotating.

When the lance pipe (15) advances by a predetermined stroke L and the nozzle (15a) reaches a predetermined position B in the combustion chamber, the tip of the rack (6) hits the stopper (29) to prevent the advance. .. Just then, the moving plate (18)
Is in a position where it disengages from the guide (21), as indicated by the dotted line in FIG. 1, thus allowing the angular shaft (9) to be unconstrained and rotated. However, the output shaft on the side of one pinion (11) has a stopper (2
Since the rotation is restricted by 9), the output shaft on the worm (7) side is increased in speed to a predetermined speed and the angular shaft (9) is rotated. The rotation of the square shaft (9) is transmitted to the lance pipe (15) via the chain drive mechanisms (19), (17) and (20) to rotate the lance pipe (15).

On the other hand, as described above, the lance tube (15)
When is moved forward by the stroke L, the notch (16a) of the opening / closing cam (16) engages with the cam follower (25a) of the link mechanism (25). And in that state the lance tube (1
When 5) rotates, the cam follower (25a) is pushed out of the notch (16a), the entire link mechanism (25) moves counterclockwise in FIG. 2, and the other cam follower (2)
As a result of 5b) operating to open the opening / closing mechanism of the head valve (13), the injection medium is supplied to the supply pipe (14) through the steam pipe (31). The jet medium supplied to the supply pipe (14) is supplied to the nozzle (1) while the lance pipe (15) makes one rotation.
The deposit (23) ejected from 5a) and adhering to the surface of the tube (24) is removed. Injection is performed by the lance pipe (1
During 5 revolutions of 5), it is performed almost parallel to the surface of the tube (24).

When the lance tube (15) completes one rotation, the dog (30) provided on the opening / closing cam (16) actuates the reverse rotation limit switch (27), and the gear motor (1).
Drive in reverse. At the same time, the engagement between the opening / closing cam (16) and the link mechanism is released, and the head valve (13) is released.
Is closed, the supply of the injection medium to the lance tube (15) is cut off, and the injection is stopped. At the same time, as a result of the groove (18a) of the moving plate (18) engaging with the guide (21) again, the rotation of the square shaft (9) is restricted and stopped, and the lance pipe (15) connected by the chain drive mechanism is stopped. ) Also stops rotating. After that, the lance pipe (15) moves backward by the rotation of the pinion (11) along with the rack (6) at a high speed, moves by L, and the position of the nozzle (15a) returns to the A position again.
It contacts the stop limit switch (26) and stops, and one cycle of the soot blowing operation is completed.

In the above, when the lance tube (15) makes one revolution and the injection is completed and the reverse rotation limit switch (27) is actuated, the gear motor (1) rotates in the reverse direction, but at this time, the moving plate (18). When the groove (18a) is not fitted to the guide (21), only the square shaft (9) rotates with the moving plate (18) (on the side of the pinion (11),
Due to the reaction force between the rack (6) and the stopper (29), the resistance is much larger than that on the worm gear unit side, and therefore the reverse drive cannot be performed), resulting in an accident. Therefore, in order to ensure the fitting of the moving plate (18) and the guide (21), an auxiliary mechanism as shown in FIG. 5 is used. Moving plate (1) fitted with guide (21)
When 8) moves from the position (a) to the position (b) by the stroke L, the fitting is released as shown by the solid line, and the movable piece (28) is placed. The movable piece (28) is given a rightward force in the figure by a spring (33). Now, when the fitting is released at the position (b) indicated by the solid line, the moving plate (18) is rotated forward by the square shaft (9) in conjunction with the lance tube (15), and the movable plate (18) is moved at the position (c). Two
8) and pushes the movable piece (28) to the position indicated by the dotted line. Then, when the movable plate (18) reaches the position (b), the movable piece (28) released from the contact is returned to the position indicated by the solid line by the spring (33). At the same time, the lance tube (15) is 1
The dog (30) rotates and the limit switch (2) for reverse rotation
Since the gear motor (1) is reversely rotated by operating 7), the movable plate (18) prevents the reverse rotation of the movable plate (18).
The groove (18a) can be securely fitted with the guide (21).

[0021]

According to the slip type soot blowing device of the present invention, the lance tube can be advanced at a high speed to a predetermined injection position, and can also be moved backward from the injection position to the start position at a high speed. Therefore, the soot blowing work time is shortened and the tip of the lance tube is exposed to the high temperature gas for a short time, so that there is no fear of overheating. Further, since the nozzle is stopped in the vicinity of the wall surface of the combustion chamber and the injection medium is injected almost parallel to the heat absorbing portion (tube), there is no risk of damaging the tube surface. Furthermore, since the injection is performed at a fixed position, the soot removal force is averaged, and an efficient soot removal effect is obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a slip-on type soot blowing device according to an embodiment of the present invention.

FIG. 2 is a side view showing the slip-on type soot blowing device.

FIG. 3 is an enlarged perspective view showing a link mechanism (25) in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG. 1 (a diagram showing engagement between a moving plate and a guide).

5 is a view taken in the direction of arrows VV in FIG. 1 (a diagram showing a fitting assist mechanism for a moving plate and a guide).

FIG. 6 is a side view showing an example of a conventional slip-on type sootblower.

[Explanation of symbols]

 (1) Gear motor (2), (3) Pulley (4), (7) Worm (5), (8) Worm gear (6) Rack (9) Square shaft (10) Support plate (11) Pinion (12) V-belt (13) Head valve (14) Supply pipe (15) Lance pipe (15a) Injection nozzle (16) Open / close cam (16a) Notch (17) Chain (18) Moving plate (18a) Groove (19), ( 20) Sprocket (21) Guide (22) Combustion chamber wall surface (23) Adhesion (24) Heat absorbing part (tube) (25) Link mechanism (25a), (25b) Cam follower (26), (27) Limit switch (29) Stopper (30) Dog (32) Differential gear (31) Steam pipe (34) Gear device

Claims (1)

Claim: What is claimed is: 1. A lance tube having an injection nozzle at its tip which is substantially perpendicular to the shaft, a rack arranged in parallel with the lance tube and engaging with a pinion, and fixed to the rack, the lance being provided. A support plate for supporting the tube in a freely rotatable and axially constrained manner, a long axis arranged in parallel with the lance tube and rotatably and axially supported by the support plate, and an input shaft. Is connected to a rotary drive source, one of the outlet shafts is connected to the pinion, the other is connected to the long shaft, respectively, a differential gear device, means for transmitting the rotation of the long shaft to the lance pipe, Means for restraining rotation of the long axis when the lance tube is behind the predetermined position, means for preventing the lance tube from moving forward of the predetermined position, and the lance tube at the predetermined position. At a certain time, the injection medium in the lance tube Tuning slide type Susu吹 apparatus characterized by comprising a feed Kyusuru means.