JPS636602Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an in-furnace monitoring device for a boiler, a combustion furnace, etc.

Furnace monitoring televisions have conventionally been installed in boilers, but their purpose is to monitor the combustion status of the burners, and they cannot monitor the lower part of the furnace and the bottom of the furnace. That is, when the burner is lit, the flame obstructs the field of view, and when the burner is not lit, the inside of the furnace is dark and no image appears.

On the other hand, boiler ignition work is carried out in the dark conditions mentioned above, and in the case of oil-fired boilers, it is assumed that the ignition system could be operated incorrectly, and as the ignition system continues to malfunction and ignite, fuel oil leaks to the bottom of the furnace. If fuel oil accumulates and ignition is successful, as the furnace temperature rises, the fuel oil that has accumulated at the bottom of the furnace will evaporate and flammable gas will spread into the furnace, causing the boiler to explode in the worst case scenario. An accident is expected.

This invention was devised to solve these problems in the conventional technology, and it is possible to accurately monitor the bottom of the furnace and ensure safety even when the burner is not ignited. The purpose is to provide a new furnace monitoring device.

In order to achieve this purpose, the in-furnace monitoring device of the present invention includes a projection lens and an imaging lens covered with air-cooled or water-cooled flexible tubes in a wall box that is equipped with seal air piping and opens into the furnace. It is characterized by suspending optical fibers equipped with such lenses so that they can be freely driven so that their lens parts face vertically and horizontally within the furnace, and connecting the fibers to a light source for projecting light and a television camera for monitoring, respectively. .

Hereinafter, the present invention will be described with reference to illustrative embodiments.

Fig. 1 is a schematic system diagram of the embodiment, Fig. 2 is an enlarged sectional view of section A in Fig. 1, and Fig. 3 is a sectional view of the water-cooled double pipe of another embodiment of section B in Fig. 2. .

In FIG. 2, an optical fiber 2 for in-furnace imaging with a lens 1 for in-furnace imaging attached to its tip and an optical fiber 5 for light emission having a light emission lens 4 attached to its tip are housed in a flexible hose 7, and the tips thereof are It is fixed to the tilting case 8. The tilting case 8 is attached to the wall box 9 via a pivot pin 10, and the tilting case lug 11 that projects rearward from the tilting case 8 is
It is connected by a tilting rod 12 to a tilting drive 13 (using a burner drive). The pivot pin 10, tilting case lug 11, tilting rod 12, and tilting drive device 13 are installed in different positions and directions depending on whether they are driven vertically or horizontally, but the principles are the same. The optical fibers 2 and 5 and the flexible hose 7 in the wall box 9 are made flexible so that they can follow the movement of the tilting case 8. The flexible hose 7 is connected to the cooling air pipe 14 outside the wall box 9, and is connected to the optical fiber 2, 5.
And the lenses 1 and 4 are cooled.

When using water as a cooling medium, as shown in Fig. 3, the flexible hose 7 has a double pipe structure with a forward and return direction, and a cooling water return and return branch 15 is installed in the wall box 9, and each is connected to an external pipe. It's starting to connect.

Further, the wall box 9 is provided with a seal air pipe 16, as shown in FIG. 2, in order to supply seal air for the purpose of preventing gas from blowing into the furnace.

As shown in FIG. 1, the optical fiber 2 for in-furnace imaging is connected to a television camera 3 for in-furnace imaging installed at a location away from the furnace, and from there the image is sent to a monitor television 17 installed in the central control room. It is now possible to send The light projection optical fiber 5 is connected to a light projection light source 6 installed at a location away from the furnace, as also shown in FIG. The wall box 9 is generally installed below the burner 18, as shown in FIG.

Next, the operation of the in-core monitoring device configured as described above will be explained.

During ignition work of the boiler, a light source light 6 for projection is turned on, and illumination light is emitted from a projection lens 4 through an optical fiber 5 for illumination to brightly illuminate the inside of the furnace.

At the same time, turn on the monitor TV 17,
An image is made to appear on an in-furnace monitoring television camera 3 and a monitor television 17 through an in-furnace image optical fiber 2 from an in-furnace image lens 1 to an image location in the furnace. While looking at this image, the tilting drive device 13
is driven to move the tilting case 8 vertically or horizontally to illuminate and image a desired location.

At this time, air or water is circulated in advance through the cooling air pipe 14 or the cooling water return branch 15, and seal air is sent from the seal air pipe 16.

The projection light source light 6 is turned off when unnecessary.

As described above, in the furnace monitoring device of the present invention, a wall box with sealed air piping installed on the furnace wall below the burners is installed so as to open into the furnace, and inside the wall box there is no external Introduce optical fibers for projecting light and optical fibers for in-furnace imaging to be connected to the light source and surveillance television camera, respectively, cover these optical fibers with air-cooled or water-cooled flexible tubes, and connect the ends of each optical fiber to With the projection lens and imaging lens each attached and their tips fixed with a tilting case, the projection lens and imaging lens can be moved vertically or horizontally inside the furnace through the tilting case. Since it is configured to be driven so as to be oriented freely, the part of the in-furnace imaging device that is attached to the furnace wall can be made compact, and as a result, the installation location can be chosen more freely than before. Additionally, the tilting case can be swiveled up and down or left and right, allowing monitoring of a wide range. Furthermore, with the installation of floodlights,
The lower part of the furnace and each part can be monitored even when the burner is not lit, that is, when the inside of the furnace is dark. Therefore, when the boiler is started, personnel in the central control room can use actual images to check whether there are any abnormalities at the bottom of the furnace or whether heavy oil has accumulated and is dangerous.

[Brief explanation of drawings]

Figure 1 is a schematic system diagram of the in-core monitoring device of the present invention.
Figure 2 is an enlarged sectional view of section A in Figure 1, and Figure 3 is an enlarged cross-sectional view of section A in Figure 1.
It is a sectional view of the water-cooled double pipe which is another example of the part B in FIG. 1...Lens for in-furnace imaging, 2...Optical fiber for in-furnace imaging, 3...Television camera for monitoring, 4...Lens for light projection, 5...Optical fiber for light projection, 6...For light projection Light source light, 7...Flexible hose (flexible tube), 8...Tilting case, 9...Wall box, 16...Seal air piping.

Claims (1)

[Scope of utility model registration request] A wall box with sealed air piping installed on the furnace wall below the burners is installed so as to be open into the furnace, and inside the wall box there is a light source for connecting to an external light source for projecting light and a television camera for monitoring. Introducing optical fibers and optical fibers for in-furnace imaging, covering these optical fibers with air-cooled or water-cooled flexible tubes, and attaching a projection lens and an imaging lens to the tips of each optical fiber to close the tips of the fibers. An in-furnace monitoring device, characterized in that the light projecting lens and the imaging lens are driven to freely face vertically or horizontally inside the furnace through the case while being fixed in a case.