Processes and systems for analyzing images of a flare burner

Patent metadata

Field	Value
Publication number	US-11519602-B2
Application number	US-202016892769-A
Country	US
Kind code	B2
Filing date	Jun 4, 2020
Priority date	Jun 7, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

Methods and systems for monitoring a flare burner with a camera. The methods and systems which may indicate to operators the presence or absence of one or more of smoke, flare flame, and steam plume and record those indications or measurements. Additionally, the methods and systems may confirm whether compliance with local regulations on visual emissions, smoke plume is achieved. The methods and systems automatically adjust the delivery rate of key inputs including measures assist fuel gas, purge gas, steam and/or air simultaneously to maintain or attain compliance with said local regulatory requirements. Also, methods for a machine learning process for using controller inputs to identify normal and abnormal flare states and provide visual indications and flare operation recommendations.

First claim

The invention claimed is:

1. A process for determining an apparent presence or absence of smoke from a flare burner associated with a processing plant, the process comprising:
a) obtaining a visual image of the flare burner and an area surrounding the flare burner;
b) analyzing the visual image by:
segmenting the visual image into a plurality of regions of interest; and
calculating a smoke index for each of the regions of interest based on a historical intensity of a plurality of pixels within each of the regions of interest; and

c) determining the apparent presence of smoke based on the smoke index for the regions of interest by comparing the smoke index to a threshold smoke index level;
d) indicating the apparent presence of smoke for the regions of interest when the smoke index is at or above the threshold smoke index level,
e) adjusting at least one process condition of the processing plant based on a difference between the smoke index at or above the threshold smoke index level; and
f) repeating steps a)-c).

2. The process of claim 1 , wherein the smoke index is calculated by:
determining an intensity value for one or more of the plurality of pixels in a particular region of interest by subtracting a background intensity value,
wherein the background intensity value of each of the plurality of pixels comprises a maximum intensity value for that pixel determined from a series of visual images.

3. The process of claim 1 , wherein the smoke index is based on an opacity determination.

4. The process of claim 3 , wherein the smoke index of each region of interest is calculated using an equation comprising:
100%*(1−INTnow/INTbackground),

wherein INTnow represents an average intensity value of one or more pixels in a particular region of interest, and wherein INTbackground represents a maximum intensity value for the one or more pixels in the particular region of interest determined from a series of visual images.

5. The process of claim 4 , wherein the series of visual images comprises between 20 to 70 frames preceding the visual image.

6. The process of claim 2 , wherein the intensity value is a color intensity value.

7. The process of claim 1 , wherein the plurality of regions of interest are moving in relation to the flare burner.

8. The process of claim 1 , wherein the plurality of regions of interest are static in relation to the flare burner.

9. The process of claim 1 , wherein the at least one process condition is adjusted to maintain the smoke index at a predetermined set point.

10. The process of claim 1 , wherein steps a)-c) are repeated until the smoke index reaches a predetermined level.

11. The process of claim 1 , further comprising:
calculating a reliability value for each smoke index calculated.

12. The process of claim 11 , wherein the step of indicating the apparent presence of smoke for the regions of interest utilizes at least one non-camera based value, and wherein in the process further comprises:
increasing a weighting to the non-camera based value used for indicating the apparent presence of smoke based on the reliability values.

13. The process of claim 12 , wherein the non-camera based value comprises a
current process condition information of the processing plant.

14. The process of claim 12 , wherein the non-camera based value comprises a current atmospheric condition information at the flare burner.

15. The process of claim 1 , further comprising:
obtaining an audio signature of the flare burner corresponding to the visual image, and wherein the smoke index for each regions of interest is calculated based on the audio signature.

16. The process of claim 1 , further comprising:
obtaining an UV image of the flare burner corresponding to the visual image, and wherein the smoke index for each regions of interest is calculated based on the UV image.

17. The process of claim 1 , further comprising:
obtaining a temperature at a predetermined position spaced from the flare burner corresponding to the visual image;
comparing the temperature to a threshold temperature; and
performing an action when the temperature meets or passes the threshold temperature.

18. A process for determining an apparent presence or absence of smoke from a flare burner associated with a processing plant, the process comprising:
obtaining a plurality of visual images of the flare burner and an area surrounding the flare burner, wherein the plurality includes an image with no smoke and an image with smoke, and wherein the presence or absence of smoke has been predetermined;
analyzing each visual image by:
segmenting the visual image into a plurality of regions of interest, wherein the plurality of regions of interest are static in relation to the flare burner; and
calculating a smoke index for each of the regions of interest based on a historical intensity of a plurality of pixels within each of the regions of interest; and

determining the apparent presence of smoke based on the smoke index for the regions of interest by comparing the smoke index to a threshold smoke index level which comprises a minimum index for the images herein the presence of smoke has been predetermined; and
comparing the determination with the predetermined presence or absence of smoke with the visual image.

19. A system for process for monitoring a flare burner associated with a processing plant and configured to receive a gas to be combusted, the system configured to determine an apparent presence or absence of smoke from the flare burner, the system comprising:
at least one camera configured to obtain visual images of the flare burner and an area surrounding the flare burner; and
a controller in communication with the camera and configured to:
receive the visual images of the flare burner; and
analyze each visual image by:
segmenting the visual image into a plurality of regions of interest; and,
calculating a smoke index for each of the regions of interest based on a historical intensity of a plurality of pixels within each of the regions of interest by determining an intensity value for one or more of the plurality of pixels in a particular region of interest by subtracting a background intensity value, wherein the intensity value is a color intensity value, and wherein the background intensity value of each of the plurality of pixels comprises a maximum intensity value for that pixel determined from a series of visual images; and

determine the apparent presence of smoke based on the smoke index for the regions of interest by comparing the smoke index to a threshold smoke index level; and
indicate the apparent presence of smoke for the regions of interest when the smoke index is at or above the threshold smoke index level.

Assignees

• Honeywell Int Inc

Inventors

• Kraus Kurt Edward
• Martin Matthew
• Nebel Tobias
• Hughes Michael Kon Yew
• Haran Frank M
• Tixier Sebastien
• Harris James W

Classifications

• F23N5/003 Primary

  using detectors sensitive to combustion gas properties (F23N5/02, F23N5/18 - F23N5/26 take precedence) · CPC title

• F23G7/085 Primary

  in stacks · CPC title

• G06V20/52

  Surveillance or monitoring of activities, e.g. for recognising suspicious objects (recognising microscopic objects G06V20/69) · CPC title

• G06V10/25

  Determination of region of interest [ROI] or a volume of interest [VOI] · CPC title

• F23N2225/10

  stack temperature · CPC title