CN100456020C - Online method for testing burn through index - Google Patents

Abstract

The present invention relates to an online method for testing a burn through index, which comprises the following steps: an infrared imaging system carries out scan for an image of a sintering mineral deposit cross section of a sintering afterbody to obtain an array of the point gray scale value of a digital image; a point gray scale value array of the image is converted into a temperature value array; top and bottom edges of a sintering mineral deposit region are judged and calculated to obtain a whole mineral layer mean height h; an edge of a sintering mineral deposit burning reaction region is judged and calculated to obtain material layer mean height h of the edge of the burning reaction region and the position above an upper edge; the burn through index Inde which is obtained by calculation is h/H*100%. The online method for testing a burn through index realizes the quantization processing of the burn through degree, the present invention provides the online method for testing the burn through index, the present invention has a positive action for sintering control adjustment in the practical performance, and the present invention improves the requirement of sintering production automation level development.

Description

Online method for testing burn through index

Technical field

The present invention relates to a kind of online method for testing burn through index, specifically, relate to a kind of destination node of judging sintering process, promptly the sintering machine tail grill thoroughly degree methods, and carry out the method for quantification treatment to grilling thoroughly degree.

Background technology

The tail of sintering machine is the destination node of sintering process, the machine run speed that the degree of grilling thoroughly in tail sintering mineral deposit has directly reflected sintering machine whether rationally, the quality of bed permeability and the height of fuel ratio, be to be used to one of important qualitative index of producing adjusting.For a long time, in order to realize the continual and steady and high-quality production of SINTERING PRODUCTION, mainly be the method for taking artificial Direct observation and observing by sintering machine tail visible light closed-circuit TV system, the on-line monitoring of sinter quality generally adopts the method for the section infrared image of analyzing tail.The infrared image of sintering machine tail discharge zone sinter cake section can directly reflect the information of bed of material state, is the combined reaction of sintering production process, can be used as the main foundation of heat levels in the control sinter bed.Operating personnel utilized plant-tail section in the past, observe light and shade, color, size, distribution and the position of red heat band in adjacent several tail cross section of sintering machine, the integrality of sinter cake discharging and the size of dust etc., comprehensively the experimental knowledge of self is judged the quality index of sintering and the reasonable value of various operating parameters.But because this method exists problems such as the interference of human factor and imperfection, so people seek to develop some work of simulated operation worker in various degree, utilize the obtaining continuously and the judgement system of image of tail cross section of sintering machine, overcome the deficiency of manual method.Below concluded the main research and development in this field both at home and abroad at present:

1. industrial tv monitoring system

The sintering machine tail industrial tv monitoring system is the sintering machine tail routine monitoring means that generally adopt both at home and abroad, it is to utilize the industrial camera picked-up tail cross section of sintering machine be installed in sintering machine tail dust cover place, and shows on the colour of central control room (CCR) or operation room or black-and-white television.Alleviate sintering operation worker's labour intensity, helped stable and the improvement operation, avoided equipment breakdown.But it is not for further processing to obtain more valuable information to cross-section image.

2. infrared point temperature instrument formation method

Adopt the infrared point temperature instrument, use the timesharing imaging method, the infrared image of picked-up tail cross section of sintering machine, promptly by machinery or manual scanning, one width of cloth cross-section image is measured discrete several row, every row is measured discrete several points, and all measurement points complete cross-section image that is put together is for further processing and obtains the interval of corresponding sintering deposit ferrous oxide content this image.Because the defective of device hardware itself causes influencing its practical application.But this research has been carried out good try to the extraction of characteristics of image.

3. Near Infrared CCD image capture method

" the sintering machine tail infrared thermal imaging computer vision and the information handling system " of University of Science ﹠ Technology, Beijing and Jinan iron and steel group company joint research and development adopted the Near Infrared CCD image capture method.This system is the system of present domestic first successful on-line operation, provides useful experience for further developing and improve the sintering machine tail on-line monitoring system.But this system is owing to be subjected to the wavelength restriction, and saturated phenomenon appears in high temperature section, has hindered diagnostic analysis.

4. visible light CCD image capture method

Northeast China university adopts visible light CCD image capture method picked-up tail cross section of sintering machine image, image some simple processing have been carried out, as extract the area of burning band and sintering belt, in conjunction with sintering operation worker's experience, developed an expert system that the certain guidance effect is simply arranged.But this method is not seen practice on sintering machine.

5. SECOS (Sintering Energy Control System) system

Kawasaki, Japan system iron Chiba factory has developed sintering energy management system SECOS in 1986.The SECOS system mainly by to waste gas (as CO, CO ₂Deng) analysis determine real carbon amount (RC), obtain the ratio HZR (Hot Zone Ratio) of red heat band in the sintering machine afterbody sintering deposit section by the monitor that is installed in the sintering machine afterbody, and technological process controlled according to these two variablees.HZR refers to that the red heat band is in shared ratio of time more than 600 ℃ in the sintering machine afterbody sintering deposit sectional area.But owing to the measured value of HZR often is subjected to the sinter cake be full of cracks, the influences such as interference of unloading the ore deposit state alter a great deal, so after the SECOS system will carry out smoothing processing to measured value, be used further to production control.In addition, RC is about 85 minutes to the change response time of mixed carbon comtent, and is subjected to mixed carbon comtent bigger with the influence of other factor, therefore can not grasp the variation of mixed carbon comtent in the short time.

6. sintering machine tail thermal imaging system

The light Yang Chang of Korea S Pohang Iron and Steel Corporation has installed high resolving power (512 * 512 pixel), a low noise charge-coupled device (CCD) video camera that is used for thermal imaging at the sintering machine tail discharge zone, the high temperature image is absorbed from plant-tail section is positive by this video camera, between sinter cake section and video camera, laid a narrow bandpass filter plate (centre wavelength 650mm, wide 3nm), characterize the feature of agglomerate surface with 0.25 hundred ten thousand discrete temperature spot array, the separation of red heat band is decided to be 1000 ℃, and each shunting flashboard is partly calculated red heat band ratio by following equation:

In addition, 70 cover thermopairs also have been installed in the several typical bellows under grid section, every cover thermopair is over against the shunting flashboard that is used to control cloth density along 5 on the chassis Width, the output one of the distribution of the certain heat levels of Width and thermopair is used from the openness of control shunting flashboard in the thermal imagery information, and the integral area of certain heat levels is used for control and joins C amount and chassis speed.

Six kinds of above-mentioned methods are subjected to the influence of the experienced degree of observer, tail dust bigger, and labour intensity is also bigger, nor meet the needs that improve the development of SINTERING PRODUCTION automatization level.

Summary of the invention

The present invention proposes a kind of online method for testing burn through index, it utilizes array focal plane infrared imagery technique, the image of picked-up tail sintering mineral deposit section, on the basis of carrying out Digital Image Processing, the ONLINE RECOGNITION method of degree is grilled thoroughly in enforcement, and defined the notion of burn through index, realized the quantification treatment of the degree of grilling thoroughly.

For achieving the above object, a kind of online method for testing burn through index provided by the invention comprises following steps:

1, infrared imaging system scans the image of sintering machine tail sintering mineral deposit section, the data image signal of the sintering machine tail sintering mineral deposit section that collects is transferred to main frame, (this image resolution ratio is m * n to obtain the data image signal of this sintering machine tail sintering mineral deposit section simultaneously, promptly the point of a frame of this image, n capable by m row constitutes) the array of some gray-scale value, following listed:

$X_{m\×n}=\left\{\begin{array}{cccccc}{x}_{\mathrm{1,1}}& x_{\mathrm{1,2}}& \·& \·& \·& x_{1,n}\\ x_{\mathrm{2,1}}& x_{\mathrm{2,2}}& \·& \·& \·& x_{2,n}\\ \·& \·& \·& & & \·\\ \·& \·& & \·& & \·\\ \·& \·& & & \·& \·\\ x_{m,1}& x_{m,2}& \·& \·& \·& x_{m,n}\end{array}\right\}.$

2, in computing machine, the gray-scale value of each point on the data image signal of sintering machine tail sintering mineral deposit section is converted into temperature value, thereby with the array X of the some gray-scale value of the image of above-mentioned sintering machine tail sintering mineral deposit section _{M * n}Be converted into the array of image temperature value, that is:

$T_{m\×n}=\left\{\begin{array}{cccccc}{t}_{\mathrm{1,1}}& t_{\mathrm{1,2}}& \·& \·& \·& t_{1,n}\\ t_{\mathrm{2,1}}& t_{\mathrm{2,2}}& \·& \·& \·& t_{2,n}\\ \·& \·& \·& & & \·\\ \·& \·& & \·& & \·\\ \·& \·& & & \·& \·\\ t_{m,1}& t_{m,2}& \·& \·& \·& t_{m,n}\end{array}\right\}.$

3, because sintering machine tail sintering mineral deposit area just accounts for wherein a part of zone of whole sintering machine tail sintering mineral deposit section, so want earlier with the temperature information of sintering machine tail sintering mineral deposit area array T from the temperature value of whole sintering machine tail sintering mineral deposit section _{M * n}In extract.

Because the sintering deposit process carries out from top to bottom gradually, so the temperature of sintering mineral deposit section gradually changes from top to bottom, the last lower limb of sintering mineral deposit area and environment temperature exist the temperature rank to get over, and that environment temperature changes comparatively speaking is smaller.So, determine the last lower limb in sintering mineral deposit with following mode:

With vectorial a=[1,1,1] ^TAs template, from left to right, from top to bottom to the array T of the temperature value of sintering mineral deposit section _{M * n}Carry out branch's computing, variable gradient to the temperature value between the consecutive point of the first every adjacent triplex row that is listed as is handled judgement, when calculating the somewhere temperature control when once occurring rising more, the point that can obtain the middle row of adjacent triplex row at this moment is the coboundary point of the first sintering mineral deposit area that lists, and is labeled as y ₁Continue then downwards, the variable gradient to temperature value of every adjacent triplex row is handled judgement, when calculating somewhere temperature control secondary when occurring rising more, the point that can obtain the middle row of adjacent triplex row at this moment is the lower limb point of the first sintering mineral deposit area that lists, and is labeled as y ' ₁

With same method the temperature value of all the other each row is handled judgement, calculates the marginal point up and down of each sintering mineral deposit area that lists, obtain thus, the coboundary point of all sintering mineral deposit sections for y ' ₁y ₂Y _n, the lower limb point of all sintering mineral deposit sections for y ' ₁Y ' ₂Y ' _n.

So 4, can obtain whole ore bed average height and be:

$\stackrel{\‾}{H}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(y_i^{\′}-y_i+1)}{n}.$

5, since the sintering deposit process carry out gradually from top to bottom, so the above zone of combustion reaction band for burning till the ore deposit, and the sintering reaction of key is not finished even is taken place as yet in the following zone sintering reaction of combustion reaction band as yet.Therefore, when sintering arrived sintering machine tail, the combustion reaction band will be most of as returning mine with the compound of lower area, reenters the preceding burden process of sintering.So will be with the temperature information in the zone more than the combustion reaction band array T from the temperature value of whole sintering machine tail sintering mineral deposit section _{M * n}In extract.

Because in sintering process, combustion reaction takes place in the fuel in the compound about A ℃, and desire to make compound fixed is the sintering deposit with certain intensity, bed of material local temperature should reach more than B ℃ (A ℃＜B ℃), the liquid phase that is fixed bulk cargo particle mainly be higher than B ℃ the zone in the generation, and should must under higher temperature, keep the regular hour in the zone, to guarantee to produce the liquid phase of sufficient amount.Therefore, define B ℃ and be the temperature separatrix of combustion reaction band, the zone that is higher than B ℃ is a zone of combustion, is clinkering zone in this zone more than separatrix on the position, and following zone is clinkering zone not.

To the bed of material reach from the top down B ℃ each row in point be labeled as y " ₁Y " ₂Y " _n, those points are the marginal point of combustion reaction band.

So 6, the bed of material average height that can obtain between combustion reaction belt edge and the upper marginal position is:

$\stackrel{\‾}{h}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(y_i^{\′\′}-y_i+1)}{n}.$

7, thus, defining relative burn through index is:

$\mathrm{Inde}=\frac{\stackrel{\‾}{h}}{\stackrel{\‾}{H}}\×100\%.$

8, last, the result that detection computations is obtained is presented on the display, the site operation personnel can control and regulate sintering in conjunction with this burn through index that utilizes Computer Processing to calculate according to the actual sintered image that shows from the industry monitoring device simultaneously timely.

The online method for testing burn through index that the present invention proposes on the basis of carrying out Digital Image Processing, is implemented to grill thoroughly the ONLINE RECOGNITION method of degree, and has been defined burn through index, has realized the quantification treatment of the degree of grilling thoroughly.In practical operation, sintering control adjustment is had positive effect, improve the needs of SINTERING PRODUCTION automatization level development.

Description of drawings

Fig. 1 utilizes method of the present invention, the structural representation that carries out the online detection of burn through index.

Embodiment

Following according to Fig. 1, preferred forms of the present invention is described.

As shown in Figure 1, be to utilize method of the present invention, the structural representation that carries out the online detection of burn through index; Comprise: infrared imaging system 101, industry monitoring device 102, main frame 103 and display 104; Infrared imaging system 101 provides two paths of signals simultaneously, and one the tunnel provides vision signal, and the real image of sintering machine tail sintering mineral deposit section is transferred to industry monitoring device 102, for site operation personnel's Direct observation; Another road provides digital signal, with the Digital Image Transmission of sintering machine tail sintering mineral deposit section to main frame 103.

Online method for testing burn through index provided by the invention comprises following steps:

1, the image of 101 pairs of sintering machine tail sintering of infrared imaging system mineral deposit section scans, the data image signal of the sintering machine tail sintering mineral deposit section that collects is transferred to main frame 103, (this image resolution ratio is 240 * 320 to obtain the data image signal of this sintering machine tail sintering mineral deposit section simultaneously, promptly a frame of this image is made of the points of 240 row, 320 row) the array of some gray-scale value, following listed:

$X_{240\×320}=\left\{\begin{array}{cccccc}{x}_{\mathrm{1,1}}& x_{\mathrm{1,2}}& \·& \·& \·& x_{1,320}\\ x_{\mathrm{2,1}}& x_{\mathrm{2,2}}& \·& \·& \·& x_{2,320}\\ \·& \·& \·& & & \·\\ \·& \·& & \·& & \·\\ \·& \·& & & \·& \·\\ x_{240,1}& x_{240,2}& \·& \·& \·& x_{240,320}\end{array}\right\}.$

2, in computing machine, the gray-scale value of each point on the data image signal of sintering machine tail sintering mineral deposit section is converted into temperature value, thereby with the array X of the some gray-scale value of the image of above-mentioned sintering machine tail sintering mineral deposit section _{240 * 320}Be converted into the array of image temperature value, that is:

$T_{240\×320}=\left\{\begin{array}{cccccc}{t}_{\mathrm{1,1}}& t_{\mathrm{1,2}}& \·& \·& \·& t_{1,320}\\ t_{\mathrm{2,1}}& t_{\mathrm{2,2}}& \·& \·& \·& t_{2,320}\\ \·& \·& \·& & & \·\\ \·& \·& & \·& & \·\\ \·& \·& & & \·& \·\\ t_{240,1}& t_{240,2}& \·& \·& \·& t_{240,320}\end{array}\right\}.$

3, because sintering machine tail sintering mineral deposit area just accounts for wherein a part of zone of whole sintering machine tail sintering mineral deposit section, so want earlier with the temperature information of sintering machine tail sintering mineral deposit area array T from the temperature value of whole sintering machine tail sintering mineral deposit section _{240 * 320}In extract.

Because the sintering deposit process carries out from top to bottom gradually, so the temperature of sintering mineral deposit section gradually changes from top to bottom, the last lower limb of sintering mineral deposit area and environment temperature exist the temperature rank to get over, and that environment temperature changes comparatively speaking is smaller.So, determine the last lower limb in sintering mineral deposit with following mode:

With vectorial a=[1,1,1] ^TAs template, from left to right, from top to bottom to the array T of the temperature value of sintering mineral deposit section _{240 * 320}Carry out branch's computing, variable gradient to the temperature value between the consecutive point of the first every adjacent triplex row that is listed as is handled judgement, when calculating the somewhere temperature control when once occurring rising more, the point that can obtain the middle row of adjacent triplex row at this moment is the coboundary point of the first sintering mineral deposit area that lists, and is labeled as y1; Continue then downwards, the variable gradient to temperature value of every adjacent triplex row is handled judgement, when calculating somewhere temperature control secondary when occurring rising more, the point that can obtain the middle row of adjacent triplex row at this moment is the lower limb point of the first sintering mineral deposit area that lists, and is labeled as y ' ₁

With same method the temperature value of all the other each row is handled judgement, calculate the marginal point up and down of each sintering mineral deposit area that lists, obtain thus, the coboundary point of all sintering mineral deposit sections is { y ₁y ₂Y ₃₂₀, the lower limb point of all sintering mineral deposit sections for y ' ₁Y ' ₂Y ' ₃₂₀.

So 4, can obtain whole ore bed average height and be:

$\stackrel{\‾}{H}=\frac{\underset{i=1}{\overset{320}{\mathrm{\Σ}}}(y_i^{\′}-y_i+1)}{320}.$

5, since the sintering deposit process carry out gradually from top to bottom, so the above zone of combustion reaction band for burning till the ore deposit, and the sintering reaction of key is not finished even is taken place as yet in the following zone sintering reaction of combustion reaction band as yet.Therefore, when sintering arrived sintering machine tail, the combustion reaction band will be most of as returning mine with the compound of lower area, reenters the preceding burden process of sintering.So will be with the temperature information in the zone more than the combustion reaction band array T from the temperature value of whole sintering machine tail sintering mineral deposit section _{240 * 320}In extract.

Because in sintering process, combustion reaction takes place in the fuel in the compound about 700 ℃, and desire to make compound fixed is the sintering deposit with certain intensity, bed of material local temperature should reach more than 1000 ℃, the liquid phase that is fixed bulk cargo particle mainly be higher than 1000 ℃ the zone in the generation, and should must under higher temperature, keep the regular hour in the zone, to guarantee to produce the liquid phase of sufficient amount.When the compound bed arrived at sintering machine tail, sintering process finished, and the condition of high temperature time of the high-temperature area of this moment is too short, even the amount of liquid phase in it is not enough, can't make the sintering deposit in this zone have the intensity of requirement.Therefore, define 1000 ℃ and be the temperature separatrix of combustion reaction band, the zone that is higher than 1000 ℃ is a zone of combustion, is clinkering zone in this zone more than separatrix on the position, and following zone is clinkering zone not.

To the bed of material reach from the top down 1000 ℃ each row in point be labeled as y " ₁Y " ₂Y " ₃₂₀, those points are the marginal point of combustion reaction band.

So 6, the bed of material average height that can obtain between combustion reaction belt edge and the upper marginal position is:

$\stackrel{\‾}{h}=\frac{\underset{i=1}{\overset{320}{\mathrm{\Σ}}}(y_i^{\′\′}-y_i+1)}{320}.$

7, thus, defining relative burn through index is:

$\mathrm{Inde}=\frac{\stackrel{\‾}{h}}{\stackrel{\‾}{H}}\×100\%.$

8, last, the result that computing is obtained is presented on the display 104, the site operation personnel can control and regulate sintering in conjunction with this burn through index that utilizes Computer Processing to calculate according to the actual sintered image that shows from industry monitoring device 102 simultaneously timely.

The online method for testing burn through index that the present invention proposes on the basis of carrying out Digital Image Processing, is implemented to grill thoroughly the ONLINE RECOGNITION method of degree, and has been defined burn through index, has realized the quantification treatment of the degree of grilling thoroughly.In practical operation, sintering control adjustment is had positive effect, improve the needs of SINTERING PRODUCTION automatization level development.

Claims (3)

1, a kind of online method for testing burn through index comprises following steps:

A, infrared imaging system scan the image of sintering machine tail sintering mineral deposit section, the data image signal of the sintering machine tail sintering mineral deposit section that collects is transferred to main frame, obtains the array X of some gray-scale value of the data image signal of this sintering machine tail sintering mineral deposit section simultaneously _{M * n}, this image resolution ratio is m * n, promptly a frame of this image point capable by m, the n row constitutes;

B, by computing machine the array of the some gray-scale value of the image of sintering machine tail sintering mineral deposit section is converted into the array T of image temperature value _{M * n}

C, use one detect vector, variable gradient to the temperature value between the consecutive point of every adjacent triplex row of first row of the array of the temperature value of sintering machine tail sintering mineral deposit section is handled judgement, when calculating the somewhere temperature control when once occurring rising more, the point that can obtain the middle row of adjacent triplex row at this moment is the coboundary point of the first sintering mineral deposit area that lists, and y makes marks ₁Continue then downwards, the variable gradient to temperature value of every adjacent triplex row is handled judgement, when calculating somewhere temperature control secondary when occurring rising more, the point that can obtain the middle row of adjacent triplex row at this moment is the lower limb point of the first sintering mineral deposit area that lists, and y ' makes marks ₁With same method the temperature value of all the other each row is handled judgement, calculate the marginal point up and down of each sintering mineral deposit area that lists, obtain thus, the coboundary point { y of all sintering mineral deposit sections ₁y ₂Y _nAnd the lower limb point y ' ₁Y ' ₂Y ' _n;

D, calculate whole ore bed average height and be: $\stackrel{\‾}{H}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(y_i^{\′}-y_i+1)}{n};$

The sintering combustion reaction zone marginal point of E, mark sintering machine tail sintering mineral deposit section y " ₁Y " ₂Y " _n;

F, the bed of material average height that calculates between combustion reaction belt edge and the upper marginal position are:

$\stackrel{\‾}{h}=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(y_i^{\′\′}-y_i+1)}{n};$

G, calculate relative burn through index and be: $\mathrm{Inde}=\frac{\stackrel{\‾}{h}}{\stackrel{\‾}{H}}\×100\%;$

H, the burn through index that the demonstration detection obtains on display.

2, online method for testing burn through index as claimed in claim 1 is characterized in that, described detection vector is a=[1,1,1] ^T

3, online method for testing burn through index as claimed in claim 1 or 2, it is characterized in that, in the described step e, judge the marginal point of combustion reaction band by the following method: in sintering process, combustion reaction takes place in the fuel in the compound about A ℃, and desires to make the fixed sintering deposit for having certain intensity of compound, and bed of material local temperature should reach more than B ℃, A ℃＜B ℃, the liquid phase of promptly fixed bulk cargo particle mainly is generation in being higher than B ℃ zone; B ℃ is the temperature separatrix of combustion reaction band, judges that the point that the bed of material reaches in B ℃ respectively being listed as from the top down is the marginal point of combustion reaction band.

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