JP3363692B2 - Spray nozzle device in combustion furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a spray nozzle device in a combustion furnace such as a refuse incinerator or a coal burning boiler.

[0002]

2. Description of the Related Art Conventionally, as a spray nozzle device provided in a refuse incinerator which is an example of a combustion furnace, there is a spray nozzle device 60 of a non-catalytic denitration device as shown in FIG. The spray nozzle device 60 sprays a liquid agent 61, which is a mixture of urea water and compressed air, into a refuse incinerator 62, and is inserted into a mounting hole 64 formed in a furnace wall 63. The spray nozzle device 60, a spray pipe 65 for supplying the liquid agent 61,
The nozzle tip 66 is detachably attached to the tip of the spray pipe 65. A urea water supply line 67 for supplying urea water to the spray pipe 65 is provided at the rear of the spray pipe 65.
And a compressed air supply line that supplies compressed air to the spray pipe 65.
68 and are connected.

According to this, when the nozzle tip 66 is clogged due to dust clogging, or the nozzle tip 66 is corroded or thermally damaged, the nozzle tip 66 is replaced.

[0004]

However, when the refuse incinerator 62 is in operation, the temperature of the spray pipe 65 in the portion A immediately behind the nozzle tip 66 becomes lower than that of the nozzle tip 66, and therefore, The acidic water contained in the combustion gas that has entered the mounting hole 64 condenses on the surface of the spray pipe 65 in the portion A immediately behind the nozzle tip 66, and as a result, the spray pipe in this portion A is condensed.
There was a problem that 65 caused dew point corrosion and had to be replaced frequently in a short period of time.

Therefore, the first aspect of the present invention is to prevent the dew point corrosion of the spray pipe immediately behind the nozzle tip.

[0006]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is a spray nozzle device for spraying a liquid agent into a combustion furnace.
Spray tube for supplying the liquid is provided, the tip of the spray pipe, the nozzle tip having a spray port is provided, at the rear of the nozzle tip, attached to the protective tube for protecting the spray tube detachably, nozzle
And the protruding position where the tip of the chip protrudes from the inner surface of the furnace wall into the furnace.
The spray pipe is inserted between the slip tip and the retracted position where it enters the cylinder.
A device for entering and leaving the
The cylinder device is installed behind the spray tube and the cylinder device
The tip of the stone rod and the rear end of the spray tube can be separated
The above cylinder device is mounted on a movable frame.
The movable frame is attached to the fixed frame via a hinge.
Rotatably connected to the arm to rotate the movable frame.
This allows the cylinder device to move from the rear of the spray pipe to one side.
It is characterized by retreating to .

According to this, by attaching the protective tube, an air layer is formed between the spray tube and the protective tube, and the heat insulating effect of this air layer prevents the protective tube from being cooled to the dew point temperature or lower. Therefore, it is possible to prevent dew point corrosion of the spray pipe immediately behind the nozzle tip. Further, when the protective tube is corroded, the protective tube may be removed and replaced, so that the service life of the spray tube can be extended.

When the combustion furnace is in operation,
The nozzle tip causes the nozzle tip to project from the inner surface of the furnace wall into the furnace.
By protruding the spray tube to the protruding position
Liquid that has dripped from the nozzle tip's nozzle hole inside the furnace wall.
It can be prevented from adhering to the surface. Therefore, the nozzle tip
The liquid dripping from the pump may adversely affect the inner surface of the furnace wall.
And can be prevented.

When the combustion furnace is at rest,
With the da device, the nozzle tip is retracted into the cylinder.
Repair the inside of the furnace by leaving the spray tube
It does not get in the way of cleaning and cleaning.

Further, at the joint part, the piston of the cylinder device is
Separate the ton rod from the spray tube and then move the movable frame.
Rotate the cylinder to move the cylinder device from the rear of the spray pipe to one side.
By retracting the spray tube toward
Can be extruded, and therefore spray pipe and nozzle tip
It is easy to inspect, clean and replace the protection tube.

Furthermore, the invention according to claim 2 is the nozzle nozzle.
Cap is detachably screwed onto the tip of the spray tube.
The protective tube is externally fitted to the spray tube and the screw
It is characterized in that it is detachably attached to the rear part of the chip .

According to this, when the protective tube is corroded , the protective tube is protected.
Turn the protective tube to remove it from the nozzle tip, and
After turning it to remove it from the tip of the spray tube, attach the protective tube to the spray tube.
Remove from the tip, and install a new protective tube at the tip of the spray tube.
The nozzle tip onto the tip of the spray tube.
After that, the protective tube may be screwed into the rear part of the nozzle tip. This
Since the protection tube can be easily replaced, as in
The service life can be extended. In addition, the nozzle tip
Strokes clogged and clogged, nozzle tip corroded
If you receive heat damage, do the same as above
It is also possible to replace only the pump.

Further, in the invention according to claim 3, the spray pipe is provided.
It is provided in the cylinder attached to the furnace wall, and the gas for purging is
The inside of the combustion furnace as a lower
It is characterized by being inclined .

According to this, the purging gas is made to flow in the cylinder.
The spray tube and protection tube and the nozzle tip
The surface is flushed with a purging gas, so the spray tube and protection tube
And can prevent the stall corrosion of the nozzle tip
It

In addition, the liquid agent sprayed from the nozzle tip
Even if the drain due to blowback enters the inside of the cylinder,
Along the inside of the tube, flowing out from the tip opening of the tube to the inside of the furnace.
It is possible to prevent the drain from accumulating in the part.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
~ It demonstrates based on FIG. Reference numeral 1 denotes a refuse incinerator which is an example of a combustion furnace, and a furnace wall 2 formed by casting is provided with a spray nozzle device 3 of a noncatalytic denitration device. The spray nozzle device 3 sprays the liquid agent 4 in which urea is mixed with compressed air into the inside of the refuse incinerator 1, and the spray pipe 7 inserted into the inside of the cylinder 6 and the spray pipe 7
It is composed of a nozzle tip 8 provided at the tip of, a cylinder device 9 provided behind the spray pipe 7, and a support frame body 10 supporting the cylinder device 9.

As shown in FIG. 3, the nozzle tip 8 is
Has a nozzle 12 and is detachably screwed and attached to the tip of the spray pipe 7. At the rear part of the nozzle tip 8, a protection tube 13 for protecting the spray tube 7 is provided. The protection tube 13 is fitted onto the spray tube 7, and the male threaded portion 15 formed at the tip of the protection tube 13 is screwed into the male threaded portion 14 formed at the rear portion of the nozzle tip 8. It is freely connected and fixed to the nozzle tip 8.

As shown in FIGS. 1 and 2, the cylinder 6 is divided into a first cylinder 6a and a second cylinder 6b in the axial direction, and the tip of the first cylinder 6a is a furnace. Mounting hole formed in wall 2
The second cylinder 6b is fitted into the flange 16 and attached, and the second cylinder 6b has a flange 17
It is attached to the rear end of the first tubular body 6a via a bolt and a nut 18. A hinge bolt 20 is attached to the rear end of the second tubular body 6b.
The lid plate 22 is attached via the and nuts 21 with handle,
The rear portion of the spray pipe 7 projects rearward from a through hole 23 formed in the cover plate 22. A receiving plate 24 for receiving the spray pipe 7 from below is provided at the inner rear end of the first tubular body 6a. Further, a purging air supply pipe 26 for supplying purging air 25 into the inside of the cylinder 6 is connected to the first cylindrical body 6a.

A urea water supply pipe 27 for supplying urea water into the spray pipe 7 and a compressed air supply pipe 28 for supplying compressed air are provided at the rear end of the spray pipe 7 protruding rearward from the cover plate 22. Are connected.

Further, the cylinder device 9 has a projecting position X at which the nozzle tip 8 projects from the inner surface of the furnace wall 2 into the furnace 1, and a retracted position Y at which the nozzle chip 8 retracts into the tube 6. Is an example of a retracting device for retracting the spray pipe 7, and the tip end of the piston rod 9a and the rear end of the spray pipe 7 are connected by a separable joint 30. That is, the joint 30 includes a U-shaped first joint member 32 provided at the tip of the piston rod 9a and having a pair of joint arms 31.
A second joint member 33 provided at the rear end of the spray pipe 7 and detachably inserted between both joint arms 31 of the first joint member 32.
And a connecting pin 34 that is detachably fitted into the first joint member 32 and the second joint member 33.

The support frame body 10 includes a fixed frame 35 provided on the outer peripheral surface of the second cylindrical body 6b and extending rearward, and an L-shaped movable frame mounted on the upper surface of the rear portion of the fixed frame 35. It consists of 36 and. The tip of the main body 9b of the cylinder device 9 is attached to the vertical plate portion 36a of the movable frame 36. Also a movable frame
One end of the horizontal plate portion 36b of 36 is connected to one end of the rear portion of the fixed frame 35 by a pair of front and rear hinges 37 (an example of a retracting means), whereby the movable frame 36 is connected to the cylinder device 9 by the cylinder device 9. At the same time, the hinge 37 is rotatable around the longitudinal axis 38 of the hinge 37, and the movable frame 36 is pivoted to one side and downward from the upper surface of the rear portion of the fixed frame 35 as shown by the phantom line in FIG. As a result, the cylinder device 9 can be retracted from the rear of the spray pipe 7 as shown by the phantom line in FIG. Further, the other end of the horizontal plate portion 36b of the movable frame 36 and the other end of the rear portion of the fixed frame 35 are detachable butterfly bolts.
It is connected and fixed by 39 and a nut 40.

Further, as shown in FIG. 1, the spray pipe 7 and the cylinder 6 are attached so that the inside of the incinerator 1 is inclined downward, and accordingly, the cylinder device 9 also supports the support frame body. It is tilted at 10.

The middle of the urea water supply pipe 27 and the middle of the compressed air supply pipe 28 are connected by a purge pipe 41. The purging pipe 41 is opened and closed by a purging valve 42. Further, a urea water supply valve 43 is provided in the urea water supply pipe 27 upstream of the connection position of the purging pipe 41, and the purging pipe 41 is connected. Compressed air supply pipe 28 upstream of the position
A compressed air supply valve 44 is provided in the.

The operation of the above structure will be described below.
When the refuse incinerator 1 is in operation, the urea water supplied from the urea water supply pipe 27 and the compressed air supplied from the compressed air supply pipe 28 are supplied to the spray pipe 7, and the urea water is compressed with compressed air. The mixed liquid 4 is sprayed from the nozzle 12 of the nozzle tip 8 toward the inside of the furnace 1. At this time, as shown by the solid line in FIG. 1, since the spray pipe 7 projects to the projecting position X, the nozzle tip 8 projects from the inner surface of the furnace wall 2 into the furnace 1 and drips from the injection port 12. The liquid agent 4 can be prevented from adhering to the inner surface of the furnace wall 2. Therefore, the nozzle tip 8
It is possible to prevent the liquid agent 4 dripping from the negative influence on the inner surface of the furnace wall 2.

Further, since the protective tube 13 is attached, an air layer is formed between the spray tube 7 and the protective tube 13, and the thermal insulation effect of this air layer cools the protective tube 13 to a temperature below the dew point temperature. Since it is eliminated, the dew point corrosion of the spray pipe 7 immediately behind the nozzle tip 8 can be prevented. Further, when the protective tube 13 is corroded, as shown by the phantom line in FIG.
After removing the protective tube 13 from the tip of the spray tube 7, and fitting the new protective tube 13 onto the tip of the spray tube 7 and screwing the nozzle tip 8 into the tip of the spray tube 7, Female thread 15
Is screwed into the male screw portion 14 of the nozzle tip 8. In this way, since the protective tube 13 can be easily replaced, the service life of the spray tube 7 can be extended.

If the nozzle hole 8 of the nozzle tip 8 is clogged with dust and is clogged, or the nozzle tip 8 is corroded or damaged by heat, it is possible to replace only the nozzle tip 8 in the same manner. is there.

Further, the air 25 supplied from the purging air supply pipe 26 to the rear portion of the cylinder 6 flows inside the cylinder 6 and is discharged into the furnace 1 through the tip opening 45. The outer surfaces of the tube 13 and the nozzle tip 8 are washed with air 25,
It is possible to prevent the corrosion of the spray pipe 7, the protection pipe 13 and the nozzle tip 8 from the outside.

Further, since the spray pipe 7 and the cylinder 6 are mounted so as to be inclined with the inner side of the refuse incinerator 1 facing downward, the drain due to the blowback of the liquid agent 4 sprayed from the nozzle tip 8 is inside the cylinder 6. Even if it invades, the drainage can be prevented from flowing out of the front end opening 45 of the cylinder 6 into the inside of the furnace 1 along the inclination and collecting inside the cylinder 6.

Further, the compressed air is purged from the compressed air supply pipe 28 by temporarily closing the urea water supply valve 43 and opening the purge valve 42 with the compressed air supply valve 44 left open. Since the urea water is supplied to the urea water supply pipe 27 through the working pipe 41, the inside of the urea water supply pipe 27 on the downstream side of the urea water supply valve 43 can be purged.

When the refuse incinerator 1 is stopped for abnormalities or cleaning, as shown by the phantom line in FIG. By retracting the spray tube 7, the nozzle tip 8 and the tip of the spray tube 7 do not get in the way when repairing or cleaning the inside of the furnace.

Furthermore, when the refuse incinerator 1 is stopped,
As shown by the phantom line in FIG. 2, the connecting pin 34 of the joint 30 is pulled out, the piston rod 9a of the cylinder device 9 is slightly retracted, and the second joint member 32 is removed from both joint arms 31 of the first joint member 32. By removing 33, the piston rod 9a and the spray pipe 7 are separated. Then, the butterfly bolt 39 and the nut 40 are removed, the movable frame 36 is rotated together with the cylinder device 9 around the longitudinal axis 38 of the hinge 37, and the movable frame 36 is fixed as shown by the phantom line in FIG. flame
35 Rotate one side and downward from the rear upper surface. Thereby, as shown by the phantom line in FIG. 2, the cylinder device 9 can be retracted from the rear of the spray pipe 7. After that, loosen the nut 21 with handle and remove the hinge bolt 20 from the lid plate 22,
By removing the cover plate 22 from the second cylindrical body 6b, the spray pipe 7
Can be easily pulled out from the inside of the cylinder 6 to the rear.
Therefore, it is possible to easily inspect and clean the spray pipe 7 and the nozzle tip 8 and replace the protection pipe 13.

In the above embodiment, the spray nozzle device 3 of the non-catalytic denitration device provided in the waste incinerator 1 is described as an example of the spray nozzle device in the combustion furnace. Therefore, a spray nozzle device that sprays water may be used, and further, a spray nozzle device that is provided in a coal-fired boiler and sprays urea water to perform desulfurization / denitration may be used. Further, not only urea water but also other reducing agents may be used.

[0033]

As described above, according to the invention of claim 1 of the present invention, an air layer is formed between the spray tube and the protection tube by attaching the protection tube, and the air layer is formed. Since the protection tube is not cooled below the dew point temperature due to the heat insulating effect of 1, the dew point corrosion of the spray tube immediately behind the nozzle tip can be prevented. Therefore, never adversely affect removal capability of NO _X, it is possible to long-term continuous stable operation. Further, when the protective tube is corroded, the protective tube may be removed and replaced, so that the service life of the spray tube can be extended.

When the combustion furnace is in operation,
The nozzle tip causes the nozzle tip to project from the inner surface of the furnace wall into the furnace.
By protruding the spray tube to the protruding position
Liquid that has dripped from the nozzle tip's nozzle hole inside the furnace wall.
It can be prevented from adhering to the surface. Therefore, the nozzle tip
The liquid dripping from the pump may adversely affect the inner surface of the furnace wall.
And can be prevented.

When the combustion furnace is at rest,
With the da device, the nozzle tip is retracted into the cylinder.
Repair the inside of the furnace by leaving the spray tube
It does not get in the way of cleaning and cleaning.

Further, at the joint portion, the piston of the cylinder device is
Separate the ton rod from the spray tube and then move the movable frame.
Rotate the cylinder to move the cylinder device from the rear of the spray pipe to one side.
By retracting the spray tube toward
Can be extruded, and therefore spray pipe and nozzle tip
It is easy to inspect, clean and replace the protection tube.

Furthermore, according to the second aspect of the invention, the coercive
If the protective pipe corrodes, turn the protective pipe from the nozzle tip.
Remove, turn the nozzle tip and remove from the tip of the spray tube.
After removing the protective tube from the tip of the spray tube,
Protective tube is externally fitted to the tip of the spray tube and the nozzle tip is sprayed.
After screwing on the tip of the tube, attach the protective tube to the rear of the nozzle tip.
Just screw it in. This way, you can easily replace the protection tube
Therefore, the service life of the spray pipe can be extended. Well
Also, if the nozzle tip is clogged with dust
If the tips are corroded or damaged by heat,
In this way, it is possible to replace only the nozzle tip.
It

Further, according to the invention of claim 3, the cylinder
By flowing the gas for purging inside, spray pipe and protection pipe
And the outer surface of the nozzle tip is flushed with purge gas.
Because of this, street corrosion of spray pipes and protection pipes and nozzle tips
Can be prevented.

In addition, the liquid agent sprayed from the nozzle tip
Even if the drain due to blowback enters the inside of the cylinder,
Along the inside of the tube, flowing out from the tip opening of the tube to the inside of the furnace.
It is possible to prevent the drain from accumulating in the part.

[Brief description of drawings]

FIG. 1 is a side view of a spray nozzle device according to an embodiment of the present invention.

FIG. 2 is a plan view of the spray nozzle device.

FIG. 3 is a cross-sectional view of a nozzle tip attached to a spray tube and a protection tube.

FIG. 4 is a front view of a retracting unit.

FIG. 5 is a schematic side view of a conventional spray nozzle device.

[Explanation of symbols]

1 garbage incinerator (combustion furnace) 2 furnace wall 3 Spray nozzle device 4 liquid agents 6 cylinders 7 Spray tube 8 nozzle tips 9 Cylinder device (leaving device) 9a Piston rod 12 nozzle 13 Protection tube 25 Purge air 30 fittings 37 Hinge (withdrawal means) X protruding position Y Entry position

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-10555 (JP, A) Registered utility model 3011416 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B05B 1 / 00-1/36 F22B 37/00 F23G 5/48 ZAB

Claims (3)

(57) [Claims] 1. A spray nozzle device for spraying a liquid agent in a combustion furnace, wherein a furnace wall is provided with a spray tube for supplying the liquid agent, and a tip of the spray tube is provided with a nozzle tip having an injection port,
A protective tube that protects the spray tube is detachably attached to the rear of the nozzle tip , and the nozzle tip protrudes from the inner wall of the furnace into the furnace.
And the retracted position where the nozzle tip retracts into the cylinder,
A device for moving the spray pipe back and forth was installed, and a cylinder device was installed behind the spray pipe as the above-mentioned device.
The spray of the tip of the piston rod of this cylinder device
The rear end of the pipe is connected with a separable joint, the cylinder device is attached to a movable frame , and the movable frame is rotated to a fixed frame via a hinge.
Cylinder device that is freely connected and rotates the movable frame.
The spray nozzle device in a combustion furnace is characterized in that it retreats from the rear of the spray pipe to one side . 2. The nozzle tip can be attached to and detached from the tip of the spray pipe.
The protective tube is fitted onto the spray tube and screwed into the nozzle nozzle.
The spray nozzle device in a combustion furnace according to claim 1, wherein the spray nozzle device is detachably attached to a rear portion of the cup . 3. A spray pipe is provided in a cylinder attached to a furnace wall,
A purging gas is caused to flow in the cylinder, and the spray tube and the cylinder are inclined with the inside of the combustion furnace facing downward.
The spray nozzle device in a combustion furnace according to claim 1 or 2, wherein