CN1064120C - Hearth's combustion temp field measuring method - Google Patents
Hearth's combustion temp field measuring method Download PDFInfo
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- CN1064120C CN1064120C CN 95114823 CN95114823A CN1064120C CN 1064120 C CN1064120 C CN 1064120C CN 95114823 CN95114823 CN 95114823 CN 95114823 A CN95114823 A CN 95114823A CN 1064120 C CN1064120 C CN 1064120C
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- hearth
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005855 radiation Effects 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000004616 Pyrometry Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Radiation Pyrometers (AREA)
Abstract
本发明涉及一种锅炉炉膛燃烧温度监测方法。该方法在炉膛燃烧二维温度场检测的基础上，通过在被测对象不同角度摄取多幅燃烧二维辐射图象，建立已知二维温度场与未知三维温度场的相应关系，从而得到炉内三维燃烧温度场的分布。The invention relates to a method for monitoring the combustion temperature of a boiler furnace. Based on the detection of the two-dimensional temperature field of furnace combustion, the method takes multiple two-dimensional radiation images of combustion at different angles of the measured object, and establishes the corresponding relationship between the known two-dimensional temperature field and the unknown three-dimensional temperature field. The distribution of the internal three-dimensional combustion temperature field.
Description
The present invention relates to a kind of boiler furnace ignition temperature field monitoring method.Be specially adapted to burner hearth burning three-dimensional temperature fields such as station boiler, Industrial Boiler, industrial furnace and detect occasion.
" adopting coal burning boiler of power station uncompleted burned carbon prediction Jie method of combustion flame image processing technique " M.Shimoda, et al, Prediction method of unburnt carbon forcoal fired utility boiler using image processing technigue of combus-tion flame, IEEE Transaetion on Energy Conversion, Vol.5, No:4, December, 1990.M.Shimoda etc., this is a kind of based on two-dimentional flame radiation image detection in the stove, according to radiation law duochrome method instrumentation two-dimension temperature field distribution, with the method for diagnosing combustion operating mode.Application number is in the patent application case of 94111569.0 " furnace of power-plant boilers ignition temperature distribution detection method and devices thereof ", said method is improved, a kind of detection method that is easy to the stove internal combustion two-dimension temperature field distribution that realizes in the furnace of power-plant boilers combustion monitoring is provided.But still fail to solve the monitoring problem of three-dimensional temperature field.Though proposed the method for several measurement burning three-dimensional temperature fields at present, as adopt laser hologram tomography (Xiao Xudong etc., " application of cyclic algebra iteration method of relaxation in holographic tomography measurement three-dimensional temperature field ", " Proceedings of the CSEE ", the 14th the 2nd phase of volume, 1994), this method is owing to industrial size of burner hearth is huge, environment abominable, the reasons such as complexity of the characteristic of furnace wall, the restriction of laser power and debugging are difficult to promote the use of.Also just like L.J.Muzio etc., " sound wave pyrometry: a kind of new boiler diagnostic tool ", power engineering (U.S.) in November, 1989 (L.J.Muzio, et al., A-coustic pyrometry:a new boiler diagnostie tool, Power Engineer-ing, November, 1989), this Technology Need is offered a lot of holes on every side acoustic emission (loudspeaker) and sound reception (microphone) device is installed in the furnace wall, by measuring the variation of sound wave spread speed in the medium of different temperatures, adopt CT commercial measurement temperature field.Because the density height of temperature field measurement point just need offer a lot of holes, and in fact this is unallowed, Kong Yue is many, and the input of whole device is also huge more, and therefore, this technology also is difficult to promote the use of.
At the shortcoming that above-mentioned prior art exists, task of the present invention provides a kind of measuring method that adopts the burner hearth burning three-dimensional temperature field of radiation image processing.
Technical measures and basic principle that the present invention taked are as follows: absorb several combustion flame two-dimensional radiation images from the several different angles of burner hearth and can calculate corresponding two-dimension temperature field distribution (wherein the reference point temperature adopts colorimetric method directly to measure from burner hearth), the picked-up flame picture generally adopts CCD (Charge-Coupled Device, the electric charge coupling apparatus) camera, for on the taking the photograph image a bit, all imaging of furnace inner space have just constituted from the straight line of CCD camera lens in the point of this point, it is defined as " projection line ", so image is gone up every bit its different " projection line " is arranged all, like this, " projection line " of being had a few on the images becomes " radial " to distribute naturally.One of important evidence of the present invention is, except being absorbed by the way medium, the summation of remaining part was exactly the radiant energy that corresponding points are accepted on the CCD target surface when radiation that " projection line " goes up each point arrived the CCD target surface through different distances.If certain bar " projection line " go up each point be i (i=1 ..., n), temperature is respectively T
i(i=1 ..., n), i is the point on the three dimensions.The j point is corresponding with it in the two-dimensional temperature field image, and the j point is the point on the two dimensional surface.Can set up the known temperature T that j is ordered on the two-dimensional temperature field image
iThe unknown temperatures T of ordering with i on the three-dimensional furnace inner space
iThe corresponding relation of (the i point all is positioned on " projection line " that j orders) is:
R wherein
iBe l
iFunction, f (l
i) be absorptivity.If use conversion a
j=exp (C
2/ λ T
i), X
f=exp (C
2/ T
i) then following formula become:
Be a linear algebraic equation.In case obtain x
i, can therefrom obtain T
iTherefore, following formula has promptly been set up directly and has been handled the Temperature Distribution T that obtains by the two-dimensional radiation image
jWith the temperature T that is positioned at " projection line " last each point i on the three dimensions in the stove
fCorresponding relation.From a width of cloth two-dimension temperature distribution image, can set up a lot of such corresponding equations, it is equation group, from the different two-dimensional image of several different angles picked-ups, can set up the more equation group of equation number, on physical significance, can contradiction between these different equations.The analysis showed that, as long as guarantee that any point in the stove is (according to the density measurement difference of the three-dimensional temperature field that requires, furnace inner space is split into the small three-dimensional zone that number does not wait, temperature field measurement density is high more, grid is close more, temperature to be asked is counted the more) in two or more images, projection is arranged, then can obtain the enough information of finding the solution three-dimensional temperature field.For a regular cube combustion zone, the analysis showed that as long as CCD camera gun visual angle is suitably big, four CCD cameras were arranged at the center of four faces respectively about then only need descended, and then can achieve the goal thereon.For complex-shaped object, the number that always can increase the CCD camera satisfies this condition, and the CCD camera does not need too much yet.After obtaining this equation group, can find the solution three-dimensional temperature field.
Advantage of the present invention is: (one) image processing method of the present invention is compared with adopting laser technology, and system's simple structure is easy to realize, and adopts laser technology to be difficult to also realize that size is big at present, the burn measurement of three-dimensional temperature of the abominable burner hearth of environment.(2) the present invention compares with sonic method, need not open too many hole thereby be easier to on-the-spot test around burner hearth and accept, and is convenient to promote the use of.(3) the present invention detects applicable technology with combustion temperature in hearth and brings up to three-dimensional level from the level of two dimension.
Claims (1)
1. hearth's combustion temp field measuring method, arrange that in tested burner hearth the CCD camera is with picked-up stove internal combustion two-dimensional radiation image, it is characterized by based on two-dimentional flame radiation image in the stove and detect, adopt the radiation image treatment technology to obtain the distribution of burner hearth burning three-dimensional temperature field, promptly different angles are arranged the CCD camera with picked-up stove internal combustion two-dimensional radiation image around tested burner hearth, and the pairing radiant energy of accepting in stove of each point obtains three-dimensional ignition temperature distribution with the corresponding relation of reference point radiant energy the three dimensions in the stove from image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95114823 CN1064120C (en) | 1995-03-27 | 1995-03-27 | Hearth's combustion temp field measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95114823 CN1064120C (en) | 1995-03-27 | 1995-03-27 | Hearth's combustion temp field measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1112216A CN1112216A (en) | 1995-11-22 |
| CN1064120C true CN1064120C (en) | 2001-04-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95114823 Expired - Lifetime CN1064120C (en) | 1995-03-27 | 1995-03-27 | Hearth's combustion temp field measuring method |
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| CN (1) | CN1064120C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660947A (en) * | 2009-09-30 | 2010-03-03 | 卢家金 | Three-dimensional temperature measuring imaging system and measuring method thereof |
| CN101725997B (en) * | 2009-12-15 | 2011-09-07 | 攀钢集团钢铁钒钛股份有限公司 | Hearth safety monitoring method |
| SE535798C2 (en) * | 2011-03-08 | 2012-12-27 | Vattenfall Ab | Method and system for gas measurement in combustion chambers |
| CN103791515B (en) * | 2014-02-19 | 2016-05-04 | 上海交通大学 | Coal-burning boiler burner hearth exit gas temperature online soft sensor system |
| CN104101432B (en) * | 2014-07-17 | 2017-03-22 | 中国华能集团公司 | Method for measuring temperature distribution of inner walls of sealed cavity metalware |
| CN104299268B (en) * | 2014-11-02 | 2017-04-05 | 北京航空航天大学 | A kind of flame three dimensional displacement fields method of high dynamic range imaging |
| CN118817085B (en) * | 2024-08-13 | 2025-04-01 | 华中科技大学 | A CT detection system for boiler combustion temperature field based on thermal radiation imaging |
-
1995
- 1995-03-27 CN CN 95114823 patent/CN1064120C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1112216A (en) | 1995-11-22 |
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Expiration termination date: 20150327 Granted publication date: 20010404 |