CA1066535A - Radiation viewer for inspecting an enclosure - Google Patents
Radiation viewer for inspecting an enclosureInfo
- Publication number
- CA1066535A CA1066535A CA256,204A CA256204A CA1066535A CA 1066535 A CA1066535 A CA 1066535A CA 256204 A CA256204 A CA 256204A CA 1066535 A CA1066535 A CA 1066535A
- Authority
- CA
- Canada
- Prior art keywords
- instrument
- screen
- opening
- enclosure
- orifice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
- F27D25/001—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag comprising breaking tools, e.g. hammers, drills, scrapers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for inspecting the interior of an enclosure comprises an instrument which receives radiation from the inter-ior of the enclosure through an orifice at one end of the instru-ment. A screen located immediately in front of the instrument has an opening in register with the orifice. Compressed gas is passed between the instrument and the screen and escapes through the opening. The surface of the screen remote from the instrument is cleaned periodically or continuously, e.g. by scraping, at least around the opening.
A device for inspecting the interior of an enclosure comprises an instrument which receives radiation from the inter-ior of the enclosure through an orifice at one end of the instru-ment. A screen located immediately in front of the instrument has an opening in register with the orifice. Compressed gas is passed between the instrument and the screen and escapes through the opening. The surface of the screen remote from the instrument is cleaned periodically or continuously, e.g. by scraping, at least around the opening.
Description
~66535 The present inyention relates to a device for inspecting the interior o~ an enclosure, es~ecially (but not solely) for inspecting material contained in the enclosure.
The following description illustrates an application of the device to the inspection of the upper surface of the burden in a blast furnace. This is done, however, by way of example and without implying any limitation of the applicability of the device. A de~ice according to the invention can be used for observing the interior of any enclosure.
There is a well-recognized interest in observing what goes on in a blast furnace at the upper surface of the charge or burden, e.g. the evolution of the shape of this surface, the distribution of surface temperatures from its centre to its periphery, and the appearance of hot spots or cold zones. -These indications allow the operation of the blast furnace to be improved, this depending on appropriate addition of coke, or~ ,~
and fluxes as well as on accurate distribution of these materials across the whole of the upper surface of the burden.
The value of all data is of course subordinate to the fact of being able to correctly observe the burden by means of a device which is as reliable as possible. This condition cannot : . .
easily be met, because the space above the burden in the blast furnace may contain a compressed gas (for example, at a pressure of 2 kg) and is practically always very dusty.
~ .
~066535 In order to Qbserve the charge inside a blast furnace, various devices ha~e already ~een su~gested which are generally of the type in which scanning occurs inside a practically fixed device, or of telemetric type. In most cases, these devices permit observa~ion o~ the burden in a blast furnace through an inspection window of transparent material permanently cleaned from inside. The increase in back pressure inside blast furnaces has made the use of such inspection windows more risky. The inspection windows are difficult to clean satisfactorily by scraping. Moreover, it is difficult to ensure a jet of gas on the inner face of the inspection hole in order to clean it.
The present invention provides a device for inspecting the interior of an enclosure, comprising: (a) an observation or measuring instrument which terminates at its observation end with a very small orifice (preferably smaller than 10 mm) having a large angular aperture (preferably greater than 60);
(b) a screen located before and next to the instrument referred at (a) and formed with a very small opening (preferably smaller than 10 mm) facing the end opening of the instrument; (c) means for circulating a compressed gas in the space between the instrument and the screen and then through the opening formed in the screen; (d) means for periodically or ~ontinuously clean-ing the surface of the screen remote from the instrument, at least at the part of the screen comprising the opening.
;S535 rrhe above device accordin~ to the invention is applic-able, for example, in the observatlon of what is cJoing on in an enclosure, or in measuring the surface temperature of m~terial contained in the enclosure. It is sufficient to sealingly fix the device to any aperture of suitable dimensions formed in the wall of the enclosure. The enclosure could be a blast furnace or any other kind of furnace. So far as the instrument is concerned, it could be a simple sighting instrument, or a television camera sensitive to visible radiation or infra-red radiation, or any other radiation-receiving instrument (e.g. a ~; ;
- telemeter or a pyrometer) either scanning or not.
The device may further comprise means arranged to rotate the device about a point located close to the outlet orifice of the instrument. This variant allows the sighting axis of the instrument to be oriented at will in any directions, the whole device being, in this case, located in a sealed case. In particular, the screen may form part of a closed case containing the instrument, means being provided for turning the case in order to vary the direction from which radiation is rec~ived by the instrument.
The invention will be described further, by way of example only, with reference to the accompanying drawing, whose sole figure shows a longitudinal cross-section through the end Of an obsexvation device for inspecting the upper surface of ; the burden in a blast furnace~
In the drawing, the end of an objective is referenced 1 and is cylindrical in shape. Also visible are the side ~30 ' ... . . .
~6653C;
wall 2 of the blast fu~nace and the interior 3 of the furnace, The ob~ective 1 is surrounded by two coaxial cylindri-cal ~ackets 4 and S whose ends are welded at 6 and 7 to a ring plate 8. The end o~ the objective 1 has an orifice or pupil 9 (less than 10 mm in diameter) in register with a small opening 10 in a screen 11 fixed (by screwing) to the plate 8. The pupil 9 permits sighting within an angle of at least 40 (prefer-ably at least 60), which is also permitted by openinq 10 (less than 10 mm in diameter).
The assembly is sealingly fixed to the side wall 2 by means of a conventional system including clamps 18 and bolts 9, around an aperture or bore 20 ~ormed in the side wall 2.
A compressed-air supply (not shown) ensures that dry, oil-free air flows between the objective 1 and the jacket 4 in the direction of the arrow 12 and then flows in the direction of the arrow 13 in the restricted space between the objective 1 and the screen 11, before escaping through the open.ing 10, thereby sweeping out the opening 10 towards the interior of the furnace.
The inner faces of the ring 8 and the screen 11 are located in the same plane 14. A scraper 15, which is reciprocated by a rod 16 along the axis 17 of the rod, ensures cleaning of the surface of the screen 11 remote from the objective 1 about the opening 10. Thus the opening 10 and the area around it are regularly cleaned of undesirable material which tends to collect there.
. . .
The following description illustrates an application of the device to the inspection of the upper surface of the burden in a blast furnace. This is done, however, by way of example and without implying any limitation of the applicability of the device. A de~ice according to the invention can be used for observing the interior of any enclosure.
There is a well-recognized interest in observing what goes on in a blast furnace at the upper surface of the charge or burden, e.g. the evolution of the shape of this surface, the distribution of surface temperatures from its centre to its periphery, and the appearance of hot spots or cold zones. -These indications allow the operation of the blast furnace to be improved, this depending on appropriate addition of coke, or~ ,~
and fluxes as well as on accurate distribution of these materials across the whole of the upper surface of the burden.
The value of all data is of course subordinate to the fact of being able to correctly observe the burden by means of a device which is as reliable as possible. This condition cannot : . .
easily be met, because the space above the burden in the blast furnace may contain a compressed gas (for example, at a pressure of 2 kg) and is practically always very dusty.
~ .
~066535 In order to Qbserve the charge inside a blast furnace, various devices ha~e already ~een su~gested which are generally of the type in which scanning occurs inside a practically fixed device, or of telemetric type. In most cases, these devices permit observa~ion o~ the burden in a blast furnace through an inspection window of transparent material permanently cleaned from inside. The increase in back pressure inside blast furnaces has made the use of such inspection windows more risky. The inspection windows are difficult to clean satisfactorily by scraping. Moreover, it is difficult to ensure a jet of gas on the inner face of the inspection hole in order to clean it.
The present invention provides a device for inspecting the interior of an enclosure, comprising: (a) an observation or measuring instrument which terminates at its observation end with a very small orifice (preferably smaller than 10 mm) having a large angular aperture (preferably greater than 60);
(b) a screen located before and next to the instrument referred at (a) and formed with a very small opening (preferably smaller than 10 mm) facing the end opening of the instrument; (c) means for circulating a compressed gas in the space between the instrument and the screen and then through the opening formed in the screen; (d) means for periodically or ~ontinuously clean-ing the surface of the screen remote from the instrument, at least at the part of the screen comprising the opening.
;S535 rrhe above device accordin~ to the invention is applic-able, for example, in the observatlon of what is cJoing on in an enclosure, or in measuring the surface temperature of m~terial contained in the enclosure. It is sufficient to sealingly fix the device to any aperture of suitable dimensions formed in the wall of the enclosure. The enclosure could be a blast furnace or any other kind of furnace. So far as the instrument is concerned, it could be a simple sighting instrument, or a television camera sensitive to visible radiation or infra-red radiation, or any other radiation-receiving instrument (e.g. a ~; ;
- telemeter or a pyrometer) either scanning or not.
The device may further comprise means arranged to rotate the device about a point located close to the outlet orifice of the instrument. This variant allows the sighting axis of the instrument to be oriented at will in any directions, the whole device being, in this case, located in a sealed case. In particular, the screen may form part of a closed case containing the instrument, means being provided for turning the case in order to vary the direction from which radiation is rec~ived by the instrument.
The invention will be described further, by way of example only, with reference to the accompanying drawing, whose sole figure shows a longitudinal cross-section through the end Of an obsexvation device for inspecting the upper surface of ; the burden in a blast furnace~
In the drawing, the end of an objective is referenced 1 and is cylindrical in shape. Also visible are the side ~30 ' ... . . .
~6653C;
wall 2 of the blast fu~nace and the interior 3 of the furnace, The ob~ective 1 is surrounded by two coaxial cylindri-cal ~ackets 4 and S whose ends are welded at 6 and 7 to a ring plate 8. The end o~ the objective 1 has an orifice or pupil 9 (less than 10 mm in diameter) in register with a small opening 10 in a screen 11 fixed (by screwing) to the plate 8. The pupil 9 permits sighting within an angle of at least 40 (prefer-ably at least 60), which is also permitted by openinq 10 (less than 10 mm in diameter).
The assembly is sealingly fixed to the side wall 2 by means of a conventional system including clamps 18 and bolts 9, around an aperture or bore 20 ~ormed in the side wall 2.
A compressed-air supply (not shown) ensures that dry, oil-free air flows between the objective 1 and the jacket 4 in the direction of the arrow 12 and then flows in the direction of the arrow 13 in the restricted space between the objective 1 and the screen 11, before escaping through the open.ing 10, thereby sweeping out the opening 10 towards the interior of the furnace.
The inner faces of the ring 8 and the screen 11 are located in the same plane 14. A scraper 15, which is reciprocated by a rod 16 along the axis 17 of the rod, ensures cleaning of the surface of the screen 11 remote from the objective 1 about the opening 10. Thus the opening 10 and the area around it are regularly cleaned of undesirable material which tends to collect there.
. . .
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for inspecting the interior of an enclosure, comprising: (a) an instrument for receiving radiation from the interior of the enclosure, the radiation being received through an orifice at one end of the instrument; (b) a screen located immediately in front of the instrument and spaced therefrom, the screen having an opening in register with the said orifice, of the instrument; (c) means for passing a compressed gas through the space between the instrument and the screen and then through the opening in the screen; and (d) means for cleaning at least that part of the surface of the screen remote from the instrument which part contains the said opening.
2. A device as claimed in claim 1, in which the screen forms part of a closed case containing the instrument, means being provided for turning the case in order to vary the direction from which radiation is received by the instrument.
3. A device as claimed in claim 1, in which the trans-verse dimensions the said orifice and the said opening are smaller than 10 mm.
4. A device as claimed in claim 1, in which the angular aperture of the said orifice for the reception of radia-tion is at least 40°.
5. A device as claimed in claim 4, in which the said angular aperture is at least 60°.
6. A device as claimed in claim 1, in which the said cleaning means comprises a scraper.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE6045075A BE830895A (en) | 1975-07-01 | 1975-07-01 | DEVICE FOR MONITORING THE INTERIOR OF A SPEAKER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1066535A true CA1066535A (en) | 1979-11-20 |
Family
ID=3874638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA256,204A Expired CA1066535A (en) | 1975-07-01 | 1976-07-02 | Radiation viewer for inspecting an enclosure |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1066535A (en) |
| DE (1) | DE2628781C2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE872578A (en) * | 1978-12-06 | 1979-03-30 | Centre Rech Metallurgique | DEVICE TO CONTROL THE SURFACE OF THE LOAD OF A TANK OVEN |
| JPS5682377A (en) * | 1979-10-25 | 1981-07-06 | Centre Rech Metallurgique | Improvement of device for monitoring inside of shroud |
| DE102007058446A1 (en) * | 2007-12-05 | 2009-06-10 | Siemens Ag | Oven and cleaning device for a stove |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2926658A (en) * | 1957-07-19 | 1960-03-01 | Ligon Cleon | Shutter type furnace observation port |
| LU52435A1 (en) * | 1966-11-24 | 1968-06-25 |
-
1976
- 1976-06-26 DE DE19762628781 patent/DE2628781C2/en not_active Expired
- 1976-07-02 CA CA256,204A patent/CA1066535A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2628781C2 (en) | 1983-10-20 |
| DE2628781A1 (en) | 1977-01-27 |
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