WO2011010935A1 - The present invention relates to a method and means for real time hot x-ray inspection of formation of coke on the interior surface (s) in a furnace tube, working at high temperatures - Google Patents

The present invention relates to a method and means for real time hot x-ray inspection of formation of coke on the interior surface (s) in a furnace tube, working at high temperatures Download PDF

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Publication number
WO2011010935A1
WO2011010935A1 PCT/NO2010/000287 NO2010000287W WO2011010935A1 WO 2011010935 A1 WO2011010935 A1 WO 2011010935A1 NO 2010000287 W NO2010000287 W NO 2010000287W WO 2011010935 A1 WO2011010935 A1 WO 2011010935A1
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WO
WIPO (PCT)
Prior art keywords
cassette
oven
coke
ray source
furnace
Prior art date
Application number
PCT/NO2010/000287
Other languages
French (fr)
Inventor
Jan Demuth Pedersen
Original Assignee
Statoil Asa
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Statoil Asa filed Critical Statoil Asa
Publication of WO2011010935A1 publication Critical patent/WO2011010935A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
    • G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
    • G03B42/04—Holders for X-ray films

Definitions

  • the present invention relates to a method and means for real time hot x-ray inspection of formation of coke on the interior surface (s) in a furnace tube, working at high temperatures .
  • furnace de-coke the furnace tubes There are several methods used to de-coke the furnace tubes. In some procedures, the furnace is taken out of service during de-cokmg procedure. In other procedures, only a part of the tube banks are removed from service. In all cases, production is either halted or reduced for a longer period during the furnace de-cokmg process.
  • JP 2000131247 describes a container packed with coal.
  • the container is positioned between temperature-controllable heating bodies, facing each other inside a carbonization furnace.
  • Soft X-rays are transmitted to a cross-section where the whole face parallel to the heating faces of the heating bodies has the substantially same temperature from an X-ray generating tube, arranged outside the furnace during
  • JP 2000141247 The problem to be solved by JP 2000141247 is to directly observe condition change in expansion and shrinkage in an inside of a coal-packed bed in a carbonization process, which is a key for revealing coke strength.
  • JP 9043169 relates to an X-ray measuring sample heating furnace comprises a sample mount and a heater, a base
  • the cover including a mount at an X-ray measuring unit, and a cover mounted at the base to cover the sample, wherein the cover is a glassy carbon cover integrally moulded by glassy carbon material.
  • the shape of the area used as the X-ray permeating partition wall of the cover is the part of a sphere having a predetermined thickness, a cylindrical shape having a
  • a sample heating furnace for heating experiment exceeding 500 0 C with the wide wall can easily be provided.
  • the X-ray permeating part can freely be provided at a furnace body, and further the sample using atmospheric gas containing oxygen can be heated and measured.
  • JP 63210185 relates to means enabling rapid and easy evaluation of the coking properties of coal by inserting a compression molded coal of rectangular parallelepiped form enclosed m a specimen holding section with a space therein into a soft X-ray generating apparatus.
  • the specimen is irradiated with X-rays from an X-ray source, passing through an X-ray transmitting window and a carbon sheet impregnated with plastic. Part of the X-rays are absorbed by the
  • An object of the present invention is to provide a reliable method for monitoring formation of coke in a furnace without having to stop the process, thereby obtaining a reliable, economical and optimal operation of a refinery.
  • Another object of the present invention is to provide means and a method enabling real time monitoring of the formation of coke on the interior wall(s) of a furnace, oven or a combustor.
  • Another object is to provide an on-line
  • monitoring system for detecting the increase in thickness of the coke layer inside the heater or oven.
  • the solution comprises use of an x-ray source, such as for example an isotope, inserted into a tube or the like in an oven, the inner end of the x-ray source projecting into the heater or oven. Further an air cooled x-ray detector, such as a film, is separately inserted into the coke tube at a distance from the x-ray source through a special designed furnace hatch.
  • the x-ray detector film is arranged inside a cassette, the cassette being provided with insulation
  • high pressure air is circulated around the film in order to ensure that the film is not over-heated.
  • the high pressure air is introduced into and vented out of the cassette through ducts in the handle, the pressurized air also flowing over the surface of the film.
  • the x-ray source is cooled by means of circulation of high pressure air.
  • the x-ray source is arranged below the cassette containing the film.
  • the x-ray photography system inside the heater or the hot oven operates in a high temperature environment, the temperature being in the order of 1000 0 C or more.
  • Such means may for example be suspension and/or locking means arranged on the exterior surface of the heater or oven.
  • the means for monitoring formation of coke on the interior surface in a heater or an oven comprises an x-ray source introduced into a pipe in the wall of the oven, and a cassette containing an imaging means, such as a film, such imaging means being affected by the x-ray source, thereby indicating the imaging means, such as a film, such imaging means being affected by the x-ray source, thereby indicating the imaging means, such as a film, such imaging means being affected by the x-ray source, thereby indicating the
  • the space surrounding the imaging means may be filled with insulating material, while the cassette and/or the x-ray source preferably may be provided with means for circulating a coolant past the imaging means, thus maintaining the temperature of the monitoring means at an optimal temperature for the monitoring and imaging process.
  • the coolant may for example be in the form of high pressure air circulating around the imaging means and/or the x-ray source .
  • the x-ray source may be arranged below the cassette.
  • the cassette may be provided with locking means, locking the cassette in a stable position inside the oven during imaging.
  • a method for teal time monitoring formation of coke on the interior surface in a heater or an oven wherein an x-ray source is introduced through an opening in a wall of an oven or a heater and that a cassette containing an imaging means is introduced into another opening in the wall of the heater or the oven.
  • the x-ray source and/or the cassette may preferably be cooled by a high pressure coolant during the imaging
  • the present invention it is possible to monitor the build up of coke on the interior of the furnace or oven on a more or less real time basis without stopping the process or having to cool down the furnace. Hence, the efficiency and economy of the process will be improved, since the operator at relevant times may monitor the coke built-up without having to reduce the temperature in the furnace or to make any other impact on the process during such monitoring phases .
  • Figure 1 shows schematically a vertical view of the front of a furnace, an oven or a combustion chamber
  • Figure 2 shows schematically a horizontal section through a typical tube in a furnace configuration
  • Figure 3 shows a horizontal section through the tube shown in Figure 2 with an X-ray source introduced through a corresponding opening in the tube wall;
  • Figure 4 shows a horizontal section through the tube shown in Figure 2 with a cassette containing imaging means introduced;
  • Figure 5 shows schematically a vertical side view of an embodiment of the X-ray source according to the present invention
  • Figure 6 shows schematically a side view of an
  • Figure 7 shows schematically a top view of the cassette shown in Figure 6;
  • Figure 8 shoes schematically a vertical section through the cassette shown in figure 6, seen along the line 8-8.
  • FIG 1 shows schematically a vertical view of the front of an embodiment of a furnace 10, oven or combustion chamber.
  • the furnace 10 comprises a front wall 11 provided with a furnace opening 12 configured to be closed by means of a closable door 13, pivotably supported on hinges 14.
  • the front wall 11 is also provided with at least one opening 15, closable by means of a lid configured to be screwed or locked on to the front wall 11.
  • the lid may be removed and substituted by an X-ray source 16, which will be described in further detail below in conjunction with figures 3 and 5.
  • the door 13 may be opened, allowing a cassette 17 to be inserted into the interior of the furnace 10.
  • the X-ray source 16 may be placed at a level below the cassette 17. It should be
  • FIG. 2 shows schematically a horizontal section through a typical tube 18 in a furnace 10. As seen the furnace tube 18 has a circular cross sectional area and the layer 19 of coke is indicated by the dotted line.
  • FIG. 3 shows a horizontal section through the tube 18 shown in Figure 2 with an X-ray source 16 introduced through a corresponding opening in the tube wall
  • Figure 4 shows a horizontal section through the tube 18 shown in Figure 2, where a cassette 17 containing imaging means is inserted into the interior of the tube 18.
  • Figure 5 shows schematically a vertical side view of an embodiment of the X-ray source 16 according to the present invention.
  • the X-ray source 16 may preferably have a
  • the source 16 has an internal cavity or room for receiving the source emitting the X-rays.
  • the cavity or hole in the X-ray source may be shielded in directions away from the corresponding cassette 17, avoiding emission of x-rays to be directed towards the cassette 17.
  • the X-ray source 16 comprises an cylindrical, hollow part 20 containing an X-ray submitted source (not shown) and being provided with internal cooling ducts (not shown) , configured to allow circulation of a coolant, such as for example compressed air at a high pressure.
  • a coolant such as for example compressed air at a high pressure.
  • the coolant may be of another type, such as a medium suitable to withstand the high
  • the X-ray source 16 comprises further a middle section 21 intended to be locked to the furnace wall, for example by means of threads or bayonet locking (not shown) , allowing a sealed closure. Further, the end of the X-ray source 16 configured to be outside of the furnace, is provided with fittings allowing communication between internal ducts (not shown) in the X-ray source, and lines 22 for supply of coolant, allowing circulation of the coolant.
  • Figure 6 shows schematically a side view of an
  • Figure 7 shows schematically a top view of the cassette shown in Figure 6.
  • Figure 8 shows schematically a vertical section through the cassette shown in figure 6, seen along the line 10-10.
  • the cooling system of the imaging means and the cassette 17 and/or X-ray source 16 may be provided with valves (not shown) so as to enable change of the flow rate of coolant passing through said means 17,17.
  • the cassette 17 has a square or rectangular shape, allowing flue gas or exhaust to pass through the spaces defined by the tube wall and the sides of the cassette 17, whereby imaging operations may be performed while the furnace process still is running.
  • the cassette 17 may instead or in addition be provided with a central
  • the cassette may circular shape, corresponding to the shape of the furnace tube, making it possible to mage images of more or less the entire tube wall.
  • the cassette 17 may be introduced through the diagonal of the opening 12, alternatively that the dimensions of the opening 12 being adjusted to the dimension of the cassette 17.
  • a circular cassette 17 may have a centrally arranged hole or opening extending through the cassette vertically, thereby allowing flue gas or exhaust to pass more or less unhindered.

Abstract

The present invention relates to a method and an apparatus for monitoring formation of coke on the interior surface in a heater or an oven. The apparatus comprises an x-ray source configured to be introduced into a pipe in the wall of the oven, and a cassette containing an imaging means, such as a film. The method comprises introducing an x-ray source through an opening in a wall of an oven or a heater and introducing a cassette containing an imaging means into another opening in the wall of the heater or the oven, taking images of the interior surface of the heater or the oven.

Description

X-Ray equipment for monitoring formation of coke in furnaces
Field of Invention
The present invention relates to a method and means for real time hot x-ray inspection of formation of coke on the interior surface (s) in a furnace tube, working at high temperatures .
Background of the Invention
During normal operations of the tube furnaces the furnace tube becomes fouled by coke deposits on the interior surface of the tube. As this fouling process progresses, the furnace efficiency drops, and progressively more severe furnace conditions are required to maintain the required temperature of the process. Such build-up of the coke layer will occur on a more or less continuous basis, representing a major problem form an operational and process point of view, reducing inter alia the efficiency of the furnace and/or the process and the cost and quality. As a result of this
internal furnace tube fouling, it is necessary to
periodically de-coke the furnace tubes.
As a result of the process and combustion of for example hydrocarbons in refinery plants, furnaces etc., a build-up of coke on the interior wall of the furnace will occur more or less on a continuous basis. Such build-up of coke formation in heaters or ovens in for example refinery plants represents a major problem from an operational point of view, reducing inter alia the efficiency of the furnace and/or the process.
The very high temperatures in such furnaces represent also a problem since the temperatures is in excess of 600 0C, making it difficult to detect the build-up of coke while the furnace still is hot. Hence, in order to detect the build-up of coke, the furnace has to be closed and cooled down to an acceptable temperature.
There are several methods used to de-coke the furnace tubes. In some procedures, the furnace is taken out of service during de-cokmg procedure. In other procedures, only a part of the tube banks are removed from service. In all cases, production is either halted or reduced for a longer period during the furnace de-cokmg process.
JP 2000131247 describes a container packed with coal.
The container is positioned between temperature-controllable heating bodies, facing each other inside a carbonization furnace. Soft X-rays are transmitted to a cross-section where the whole face parallel to the heating faces of the heating bodies has the substantially same temperature from an X-ray generating tube, arranged outside the furnace during
temperature elevation by heating a coal-packed bed inside the container by the heating bodies, they are detected by an X- ray detector, tommographic images of the coal-packed bed are consecutively provided, and expansion and shrinkage of the interior of the coal-packed bed is thereby observed. Plural tommographic images different in temperatures provided during the temperature elevation by heating the coal-packed bed are analyzed each other, a difference between picture elements in the same position is found, and an expansion region and a shrinkage region which are a key for revealing coke strength are specified based on a resultant differential image. The problem to be solved by JP 2000141247 is to directly observe condition change in expansion and shrinkage in an inside of a coal-packed bed in a carbonization process, which is a key for revealing coke strength.
JP 9043169 relates to an X-ray measuring sample heating furnace comprises a sample mount and a heater, a base
including a mount at an X-ray measuring unit, and a cover mounted at the base to cover the sample, wherein the cover is a glassy carbon cover integrally moulded by glassy carbon material. The shape of the area used as the X-ray permeating partition wall of the cover is the part of a sphere having a predetermined thickness, a cylindrical shape having a
predetermined thickness or the part of a cylinder having a predetermined thickness. A sample heating furnace for heating experiment exceeding 500 0C with the wide wall can easily be provided. The X-ray permeating part can freely be provided at a furnace body, and further the sample using atmospheric gas containing oxygen can be heated and measured.
JP 63210185 relates to means enabling rapid and easy evaluation of the coking properties of coal by inserting a compression molded coal of rectangular parallelepiped form enclosed m a specimen holding section with a space therein into a soft X-ray generating apparatus. The specimen is irradiated with X-rays from an X-ray source, passing through an X-ray transmitting window and a carbon sheet impregnated with plastic. Part of the X-rays are absorbed by the
specimen, and the transmitted X-rays pass through a carbon sheet impregnated with plastic and an X-ray transmitting window and detected by a detector.
Hence, there is a need for monitoring the build-up of the coke layer on the interior of the furnace tube without substantially making any impact on the ongoing process more or less in real time, so as to enable de-coking at an optimal point in time.
Summary of the invention
An object of the present invention is to provide a reliable method for monitoring formation of coke in a furnace without having to stop the process, thereby obtaining a reliable, economical and optimal operation of a refinery.
Another object of the present invention is to provide means and a method enabling real time monitoring of the formation of coke on the interior wall(s) of a furnace, oven or a combustor.
Further, another object is to provide an on-line
monitoring system for detecting the increase in thickness of the coke layer inside the heater or oven.
The solution comprises use of an x-ray source, such as for example an isotope, inserted into a tube or the like in an oven, the inner end of the x-ray source projecting into the heater or oven. Further an air cooled x-ray detector, such as a film, is separately inserted into the coke tube at a distance from the x-ray source through a special designed furnace hatch. The x-ray detector film is arranged inside a cassette, the cassette being provided with insulation
material, insulating the film.
In addition high pressure air is circulated around the film in order to ensure that the film is not over-heated. The high pressure air is introduced into and vented out of the cassette through ducts in the handle, the pressurized air also flowing over the surface of the film.
Further, also the x-ray source is cooled by means of circulation of high pressure air.
According to one embodiment of the invention, the x-ray source is arranged below the cassette containing the film.
The x-ray photography system inside the heater or the hot oven operates in a high temperature environment, the temperature being in the order of 1000 0C or more.
During operation and monitoring, it is important that the cassette is maintained in a stable position, thereby producing good images of the interior. In order to secure such stable position, guiding and locking means are employed. Such means may for example be suspension and/or locking means arranged on the exterior surface of the heater or oven.
The objects of the present invention are achieved by means of a method and a monitoring means as further defined in characterizing part of the independent claims.
Further embodiments of the invention are defined in the dependent claims.
According to an embodiment of the invention, the means for monitoring formation of coke on the interior surface in a heater or an oven, comprises an x-ray source introduced into a pipe in the wall of the oven, and a cassette containing an imaging means, such as a film, such imaging means being affected by the x-ray source, thereby indicating the
thickness of the coke layer on the internal furnace wall.
According to one embodiment, the space surrounding the imaging means may be filled with insulating material, while the cassette and/or the x-ray source preferably may be provided with means for circulating a coolant past the imaging means, thus maintaining the temperature of the monitoring means at an optimal temperature for the monitoring and imaging process.
The coolant may for example be in the form of high pressure air circulating around the imaging means and/or the x-ray source .
According to an embodiment of the invention, the x-ray source may be arranged below the cassette. Further, the cassette may be provided with locking means, locking the cassette in a stable position inside the oven during imaging.
According to the invention also a method for teal time monitoring formation of coke on the interior surface in a heater or an oven is provided, wherein an x-ray source is introduced through an opening in a wall of an oven or a heater and that a cassette containing an imaging means is introduced into another opening in the wall of the heater or the oven.
The x-ray source and/or the cassette may preferably be cooled by a high pressure coolant during the imaging
operations .
According to the present invention it is possible to monitor the build up of coke on the interior of the furnace or oven on a more or less real time basis without stopping the process or having to cool down the furnace. Hence, the efficiency and economy of the process will be improved, since the operator at relevant times may monitor the coke built-up without having to reduce the temperature in the furnace or to make any other impact on the process during such monitoring phases .
Further, according to the present invention, frequent inspections are made possible, enabling the operator to monitor the progress of build-up of coke on the inner wall surface, thus enabling the operator to choose the most optimal point in time for de-coking from a process and economy point of view.
According to the present invention, it is also possible to study the real time effect of the coke build-up by varying the various parameters of the furnace process, thereby making it possible to optimize the process and to reduce the
frequency of maintenance and de-cokmg.
Further, without affecting the furnace economy to ant substantial degree, it is also possible by frequent imaging to establish a database containing relevant information of the effects caused by varying the various parameters on the coke build-up, making it possible to control the furnace process, establishing the most optimal process.
As a consequence of the availability of the monitoring possibilities, the total furnace economy and performance is improved .
Short description of the Drawings
The invention will be described in further details below, referring to the drawings, wherein:
Figure 1 shows schematically a vertical view of the front of a furnace, an oven or a combustion chamber;
Figure 2 shows schematically a horizontal section through a typical tube in a furnace configuration;
Figure 3 shows a horizontal section through the tube shown in Figure 2 with an X-ray source introduced through a corresponding opening in the tube wall;
Figure 4 shows a horizontal section through the tube shown in Figure 2 with a cassette containing imaging means introduced; Figure 5 shows schematically a vertical side view of an embodiment of the X-ray source according to the present invention;
Figure 6 shows schematically a side view of an
embodiment of the cassette according to the present
invention;
Figure 7 shows schematically a top view of the cassette shown in Figure 6; and
Figure 8 shoes schematically a vertical section through the cassette shown in figure 6, seen along the line 8-8.
Figure 1 shows schematically a vertical view of the front of an embodiment of a furnace 10, oven or combustion chamber. The furnace 10 comprises a front wall 11 provided with a furnace opening 12 configured to be closed by means of a closable door 13, pivotably supported on hinges 14.
Further, the front wall 11 is also provided with at least one opening 15, closable by means of a lid configured to be screwed or locked on to the front wall 11. The lid may be removed and substituted by an X-ray source 16, which will be described in further detail below in conjunction with figures 3 and 5. Further the door 13 may be opened, allowing a cassette 17 to be inserted into the interior of the furnace 10. As indicated in Figure 1, the X-ray source 16 may be placed at a level below the cassette 17. It should be
appreciated, however, that the X-ray source 16 above the cassette 17.
Figure 2 shows schematically a horizontal section through a typical tube 18 in a furnace 10. As seen the furnace tube 18 has a circular cross sectional area and the layer 19 of coke is indicated by the dotted line. The
external surface of the furnace tube 18 may be covered by an insulating material 23. It should be noted however, that the furnace tube may have any suitable shape, such as a square cross sectional area, without deviating from the inventive idea. Figure 3 shows a horizontal section through the tube 18 shown in Figure 2 with an X-ray source 16 introduced through a corresponding opening in the tube wall, while Figure 4 shows a horizontal section through the tube 18 shown in Figure 2, where a cassette 17 containing imaging means is inserted into the interior of the tube 18.
Figure 5 shows schematically a vertical side view of an embodiment of the X-ray source 16 according to the present invention. The X-ray source 16 may preferably have a
cylindrical shape. Further, the source 16 has an internal cavity or room for receiving the source emitting the X-rays. The cavity or hole in the X-ray source may be shielded in directions away from the corresponding cassette 17, avoiding emission of x-rays to be directed towards the cassette 17. As shown the X-ray source 16 comprises an cylindrical, hollow part 20 containing an X-ray submitted source (not shown) and being provided with internal cooling ducts (not shown) , configured to allow circulation of a coolant, such as for example compressed air at a high pressure. It should be appreciated, however, that the coolant may be of another type, such as a medium suitable to withstand the high
temperatures and still being able to maintain the surface temperature of the imaging means at the required temperature. The X-ray source 16 comprises further a middle section 21 intended to be locked to the furnace wall, for example by means of threads or bayonet locking (not shown) , allowing a sealed closure. Further, the end of the X-ray source 16 configured to be outside of the furnace, is provided with fittings allowing communication between internal ducts (not shown) in the X-ray source, and lines 22 for supply of coolant, allowing circulation of the coolant.
Figure 6 shows schematically a side view of an
embodiment of the cassette 17 according to the present invention, while Figure 7 shows schematically a top view of the cassette shown in Figure 6. Figure 8 shows schematically a vertical section through the cassette shown in figure 6, seen along the line 10-10.
The cooling system of the imaging means and the cassette 17 and/or X-ray source 16 may be provided with valves (not shown) so as to enable change of the flow rate of coolant passing through said means 17,17.
As indicated in the Figures the cassette 17 has a square or rectangular shape, allowing flue gas or exhaust to pass through the spaces defined by the tube wall and the sides of the cassette 17, whereby imaging operations may be performed while the furnace process still is running. The cassette 17 may instead or in addition be provided with a central
opening, allowing flue gas or exhaust also to pass centrally through the cassette 17.
According to a further embodiment of the invention, the cassette may circular shape, corresponding to the shape of the furnace tube, making it possible to mage images of more or less the entire tube wall. In such case the cassette 17 may be introduced through the diagonal of the opening 12, alternatively that the dimensions of the opening 12 being adjusted to the dimension of the cassette 17. A circular cassette 17 may have a centrally arranged hole or opening extending through the cassette vertically, thereby allowing flue gas or exhaust to pass more or less unhindered.

Claims

C l a i m s
1. Means for monitoring formation of coke on the interior surface in a heater or an oven, comprising an x-ray source introduced into a pipe in the wall of the oven, and a cassette containing an imaging means, such as a film.
2. Means according to claim 1, wherein the space
surrounding the imaging means is filled with insulated material.
3. Means according to claim 1 or 2, wherein the cassette and/or the x-ray source is provided with means for
circulating coolant past the imaging means.
4. Means according to one of the claims 1-3, wherein the coolant is high pressure air circulating around the imaging means and/or the x-ray source. 5. Means according to one of the claims 1-4, wherein the x- ray source is arranged below the cassette. β. Means according to one of the claims 1-5, wherein the cassette is provided with locking means, locked the cassette in a stable position in the oven during imaging.
7. Method for monitoring formation of coke on the interior surface in a heater or an oven, wherein an x-ray source is introduced through an opening in a wall of an oven or a heater and that a cassette containing an imaging means is introduced into another opening in the wall of the heater or the oven.
8. Method according to claim 7, wherein the x-ray source and/or the cassette is cooled by a high pressure coolant during the imaging operations.
PCT/NO2010/000287 2009-07-20 2010-07-20 The present invention relates to a method and means for real time hot x-ray inspection of formation of coke on the interior surface (s) in a furnace tube, working at high temperatures WO2011010935A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20092734A NO329760B1 (en) 2009-07-20 2009-07-20 X-ray equipment for monitoring coke coating in ovens
NO20092734 2009-07-20

Publications (1)

Publication Number Publication Date
WO2011010935A1 true WO2011010935A1 (en) 2011-01-27

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