JPH08178260A - Combustion monitor for boiler - Google Patents

Abstract

PURPOSE: To monitor combustion at all times in the vicinity of a combustor by providing a device for removing ash with mechanical operation in a monitor for monitoring the combustion state in a furnace of a coal firing thermal power plant boiler. CONSTITUTION: There are connected to a furnace monitoring ITV camera a removal frame 13, a cylinder 12, air pipings 11-1, 11-2, 11-3, and a solenoid valve 10. A device includes a timer circuit 9 for receiving a monitor start signal from a camera controller 2 to operate the removal system. Hereby, there is ensured normal monitor and furnace monitor in the vicinity of the combustor, and hence a monitoring technique of plant combustion is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal power generation boiler, and more particularly to a monitoring device equipped with a monitoring ITV camera for monitoring the combustion state of a burner of a coal burning boiler and an optical fiber cable, and more particularly to monitoring in a furnace. The present invention relates to a boiler combustion state monitoring device having an operation mechanism that prevents clogging of a monitoring window due to ash generated during coal combustion, removes ash, and suppresses ash adhesion.

[0002]

2. Description of the Related Art Combustion monitoring in a boiler for a coal-fired thermal power plant is performed by forming a monitoring hole (window) in the furnace wall of the boiler, and using an ITV camera for monitoring the furnace or an optical fiber cable in the monitoring window. The inside of the furnace is monitored by means to monitor the combustion state, but in the boiler in the coal-fired power plant, there is a phenomenon that the monitoring window is closed due to the adhesion of ash generated when coal is burned. is there. Conventionally, the ITV camera for monitoring the inside of the furnace is removed and the ash is manually removed with a stick or the like.

Further, the boiler for coal-fired power generation is equipped with a soot blower (a device for spraying steam to remove soot and ash), and a monitoring window is provided near this device to monitor the inside of the furnace I.
A monitoring device such as a TV camera is installed. In this case, there is a restriction on the installation location of the ITV camera for monitoring the inside of the furnace, and the combustion state inside the furnace cannot be sufficiently monitored.

As the number of coal-fired power generation plants has increased, the types of coal used as fuel have also diversified, and it is becoming important to understand the combustion state in the furnace.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned prior art, the in-furnace monitoring is temporarily interrupted by manually removing the ash, and the combustion state can be monitored when performing the ash removal operation. Disappear.

Further, the soot blower and other devices are originally devices for removing dirt on the steam superheater and the furnace wall in the boiler. It is not installed near the combustion device because it deteriorates the internal combustion state and affects control. For this reason, the installation place of the in-core monitoring device is restricted, and sufficient monitoring cannot be performed.

It is an object of the present invention to provide a boiler combustion state monitoring device capable of constantly monitoring the combustion state of a boiler by removing the attached ash and suppressing the attachment.

[0008]

In order to achieve the above object, a boiler combustion monitoring apparatus according to the present invention images a flame in a boiler by an imaging means inserted in a monitoring hole formed in a boiler furnace wall. In the boiler combustion state monitoring device for monitoring the combustion state by means of ash for removing the combustion ash accumulated in the monitoring hole by moving back and forth in the gap between the monitoring hole and the imaging means in the axial direction of the monitoring hole. It is characterized in that a removing means is provided. The ash removing means may include an annular plate and means for moving the annular plate forward and backward in a gap between the monitoring window and the imaging means in the axial direction of the monitoring hole.

Further, the means may be piston means for moving the annular plate in the advancing / retreating direction of the monitoring hole by using air as a power source.

Further, the means may include means for periodically moving the annular plate forward and backward.

[0011]

[Function] The image pickup means and the main ash removing device are the same monitoring hole (window)
To remove the ash produced by coal combustion,
Further, by suppressing the adhesion of ash, it becomes possible to constantly monitor the inside of the furnace through the monitoring window.

Further, unlike the soot blower (a soot removing device by steam spraying), no steam is sprayed, so there is no effect on the combustion flame in the combustion device. Therefore, the combustion state near the combustion device is monitored. Can be done.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an outline of a boiler combustion state in-core monitoring device to which the present invention is applied. The apparatus shown in FIG. 1 includes an ITV camera 1 for in-reactor monitoring and an IT for in-reactor monitoring.
It is composed of a camera control device 2 connected to the V camera 1 and a motor 3 connected to the camera control device 2. The in-furnace monitoring ITV camera 1 is installed in a monitoring window 4 formed in a boiler furnace wall 7, and monitors a burner flame 6 of a combustion device (hereinafter referred to as a burner) 5 in the boiler.

The monitoring video is transmitted from the ITV camera 1 for monitoring inside the furnace to the camera control device 2 and displayed on the monitor 3.

FIG. 2 is a diagram for explaining an embodiment of the boiler combustion state monitoring device according to the present invention. It is configured by incorporating an ash removal system 8 into the in-core monitoring system shown in FIG. The ash removal system 8 is for monitoring inside the furnace I
It is installed in the same place as the monitoring window 4 in which the TV camera 1 is installed. The ash removal system 8 receives the in-furnace monitoring start signal from the camera control device 2 and operates the timer circuit 9. The removal circuit drive signal is transmitted by the timer circuit 9 in constant cycle units to operate the removal system 8. By this operation, the ash attached to the monitoring window 4 is removed, and the ash attachment is suppressed.

Next, the system configuration and operation of the removal system 8 will be described with reference to FIG. The ash removal system 8 includes a removal frame 13 for removing ash, a cylinder 12 connected to the removal frame 13, a speed controller 14 for controlling the operation of the cylinder 12, and a cylinder 12.
Solenoid valve 10 and air piping 11-1.1 for operating
1-2.11-3, and a timer circuit 9 for operating the solenoid valve 10.

In the above structure, the timer circuit 9 is operated by the in-furnace monitoring start signal from the camera control device 2. ON / O from the timer circuit 9 to the solenoid valve 10 in fixed cycle units
An FF signal (opening operation signal of the solenoid valve 10 = ON signal, closing operation signal of the solenoid valve 10 = OFF signal) is sent to open and close the solenoid valve 10. By opening / closing the solenoid valve 10, the flow direction of the air flowing through the air pipes 11-1, 11-2, 11-3 is changed, the direction of the air flowing into the cylinder 12 is changed, and the cylinder 12 is pushed or pulled. Convert. By the pushing / pulling operation of the cylinder 12, the removing frame 13 connected to the tip of the cylinder 12 is pushed / pulling operation to remove the ash. Also, the removal frame 13
The pushing and pulling strength of the cylinder 12 and the air pipe 11-
This can be performed by adjusting the flow rate of air by the speed controller 14 installed at the joint between 2 and 11-3.

Next, the method of removing ash will be described in detail with reference to FIGS. FIG. 4 shows the operating principle. The cylinder 12 is connected to the speed controller 14 and the air pipes 11-1, 11-2, 11-3. Air flows in by the opening / closing operation of the solenoid valve 10 and pushes and pulls the piston 15 inscribed in the cylinder 12.
When the solenoid valve 10 is in the opening operation, the air flow is the air pipe 11
2-1 pushes the piston 15 through the speed controller 14-1, passes through the speed controller 14-2, passes through the air pipe 11-2-2, and reaches the solenoid valve 10. vice versa,
When the solenoid valve 10 is closed, the air flow is reversed, and the air pipe 11-2-2 to the speed controller 14-2
, The piston 15 is pushed back, passes through the speed controller 14-1, passes through the air pipe 11-2-1 and reaches the solenoid valve 10. In this way, the opening / closing operation of the solenoid valve 10 converts the piston 15 inscribed in the cylinder 12 into pushing / pushing back (pulling) operation, and pushes / pulls the removal frame 13 connected to the piston 15.

FIG. 5 shows the ash removal principle by the removal frame 13. The removal frame 13 operates by pushing and pulling the cylinder 12 in the monitoring window 4 opened in the furnace wall 7. In case of pushing operation of the cylinder 12, the removing frame 1
No. 3 projects into the furnace by about half. Then, the cylinder 12 is pulled to return to the inside of the monitoring window. This push-pull operation is
It is not done continuously. This operation pushes and pulls at regular intervals. As the ash cannot be removed if the push-pull operation is continued continuously, the push-pull operation is performed when the ash is attached to some extent. As a result, the ash can be removed as lumps to some extent.

FIG. 6 shows the structure of the removal frame 13. The removal frame 13 is a circular frame having almost the same diameter as the monitoring window, and a larger circle than the in-core monitoring ITV camera 1 so that the in-core monitoring ITV camera 1 can be installed in the center of the frame. Shaped holes are provided. As a result, the removal frame 13 can be pushed and pulled without affecting the ITV camera 1 for monitoring inside the furnace. Further, it is possible to monitor and remove ash at the same position by using the in-furnace monitoring window 4.

[0022]

As described above, according to the present invention, in the in-core monitoring device for monitoring combustion in the furnace of the coal-fired power plant, the monitoring window in which the ITV camera for monitoring in-core is installed. By installing a removing device that removes ash due to mechanical operation, since it does not affect the combustion flame of a combustion device such as a burner, it can be installed near the combustion device.

As a result, the degree of freedom is given to the installation location of the in-core monitoring device, and continuous monitoring can be performed, so that stable operation management of the plant is also improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a reactor monitoring system to which the present invention is applied.

FIG. 2 is a diagram showing a configuration in which an ash removal system is incorporated in a furnace monitoring system, which is an embodiment of the present invention.

FIG. 3 is a diagram showing a detailed configuration of an ash removal system according to the present invention.

FIG. 4 is a view showing an operating mechanism of the ash removing system according to the present invention.

FIG. 5 is a diagram showing an ash removal operation according to the present invention.

FIG. 6 is a diagram showing a structure of a removal frame according to the present invention.

[Explanation of symbols]

1 ... ITV camera for monitoring inside the furnace, 2 ... Camera side control device,
3 ... Monitor, 4 ... Monitoring window, 5 ... Combustion device (burner),
6 ... Combustion flame, 7 ... Furnace wall, 8 ... Ash removal system, 9 ... Timer circuit, 10 ... Solenoid valve, 11-1, 11-2, 11
-3 (11-2-1, 11-2-2) ... Air piping, 12
... Cylinder, 13 ... Removal frame, 13-1 ... Frame tip, 13-2, 13-3 ... Frame cylinder connecting rod, 14, 14-1, 14-2 ... Speed controller, 15 ... Piston, 16 ... Ash, 17 -A camera opening.

Claims (4)

[Claims] Claim: What is claimed is: 1. A boiler combustion state monitoring device for monitoring a combustion state by capturing an image of a flame in a boiler by an image capturing means inserted in a monitoring hole formed in a boiler furnace wall, the monitoring hole and the image capturing means. The boiler combustion state monitoring device is provided with an ash removing unit that moves forward and backward in the axial direction of the monitoring hole to remove the combustion ash accumulated in the monitoring hole. 2. A boiler combustion state monitoring device for monitoring a combustion state by capturing an image of a flame in a boiler by an image pickup means inserted in a monitoring hole formed in a boiler furnace wall. And a means for moving the plate in the axial direction of the monitoring hole in a gap between the monitoring window and the imaging means. 3. The boiler combustion state monitoring device according to claim 2, wherein the means is piston means for moving the annular plate in the advancing and retracting direction of the monitoring hole by using air as a power source. Boiler combustion condition monitoring device. 4. The boiler combustion state monitoring apparatus according to claim 2, wherein the means includes means for periodically moving the annular plate forward and backward.