CN114752717B - Method for analyzing tuyere raceway width by means of hearth sampling - Google Patents
Method for analyzing tuyere raceway width by means of hearth sampling Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
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- C21B7/16—Tuyéres
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention relates to a method for analyzing the width of a tuyere raceway by using a hearth sampling means, which comprises the following steps: 1) Sampling blast furnaces with different effective furnace volumes within the damping down time of the blast furnaces; 2) Picking out coke and iron slag in different samples by adopting a magnetic suction mode, and distinguishing the detention quantity of the coke and the iron slag at different sampling positions in the furnace; screening the coke to obtain the particle size fraction and the quality of the coke at different sampling positions and obtain the average particle size of the coke at corresponding positions; the length of a convolution area and the length of a dead charge column below the radius of the hearth; the retention quantity of coke and iron slag in the rotary area and the dead material column area is calculated to obtain the retention ratio of coke and iron slag in the rotary area and the dead material column; counting coke particle sizes at different sampling positions in a convolution area and a dead material column area; 3) And calculating the height of the convolution area. The advantages are that: the physical properties of the materials in the furnace can be analyzed to obtain partial parameters of the materials, and the width of the convolution area is analyzed by combining with the operation data of the blast furnace.
Description
Technical Field
The invention belongs to the technical field of iron making, and particularly relates to a method for analyzing the width of a tuyere raceway by using a hearth sampling means after a blast furnace is stopped.
Background
More than 90% of finished molten iron is still supplied by blast furnace production, and because of the continuous progress of large furnace volume, automatic control and equipment means in the blast furnace ironmaking production process, the smelting efficiency of a blast furnace is greatly improved compared with the past, the utilization coefficient and the fuel consumption quantity of the blast furnace are improved to a great extent compared with the past, and the economy of blast furnace smelting is further enhanced compared with the past. If a good smelting effect is to be realized, the lower part of the smelting furnace is based on the operation activity degree, and the reasonable formation of the convolution region is the key point, namely the good operation state, and a reasonable convolution region form needs to be obtained under the condition of maintaining a proper operation system so as to maintain a good smelting effect. Under the modern smelting process, a rotary area at the lower part of a furnace body is an area formed by initial coal gas, and the existing form of the rotary area can play a decisive role in the reasonable distribution of coal gas flow in the furnace and further the smelting process. In the production process of the blast furnace, along with the blowing of hot air with pressure, a spindle-shaped combustion space is formed at the front end of each tuyere, and the injected pulverized coal and the coke entering the furnace are combusted inside to generate reducing gas and necessary heat required by chemical reaction; at the same time, the presence of coke, etc., which burns at its edges, also brings the necessary space for the charge to descend, so that it can be used to complete the smelting of pig iron. It can therefore be said that the form of existence of the raceway (note: length, width, height, volume, etc.) has a decisive influence on how active the blast furnace is in and on the smelting process.
The blast furnace is used as a closed high-temperature high-pressure black box operation body, the solid, liquid and gas phases in the blast furnace coexist, and in addition, the complicated physical and chemical reaction process is also accompanied, so that the environment in the blast furnace is not more complicated, and the understanding of the environment is also difficult. The modern blast furnace is planed and sampled and the like, and research results show that: the formation of the convolution zone, or the form of the convolution zone, is influenced by a plurality of factors, wherein the external factors are related to the air volume, the hot air pressure, the oxygen enrichment, the quantity of the injected coal powder and the like, and the internal factors are related to the material existence properties in the hearth, such as the coke granularity in the convolution zone, the retained quantity of the iron slag and the like. Therefore, under the influence of such complicated and variable factors, it is still difficult to obtain the tuyere raceway form information of different blast furnaces and different operation states. The in-furnace sampling technology of modern large-scale blast furnaces is a method for obtaining materials in the furnaces by utilizing a sampling tube matched with an air port sampling machine and deeply penetrating the sampling tube into the furnaces after different blast furnaces stop blowing down, and is also one of mature technologies. And the data such as coke granularity, slag iron retention ratio, convolution zone length and the like can be obtained after necessary detection and analysis are carried out on the taken materials in the furnace, so that the material state in the convolution zone can be accurately known. Since the convolution structure is complex and related to many parameters, it is necessary to find a suitable method for analyzing the convolution shape, such as length, width, height, volume, etc. The method is feasible at present, and is characterized in that material information in the blast furnace is acquired by utilizing a tuyere sampling technology, and a necessary mathematical relation between a convolution area and the parameters is established by combining operation parameters of the blast furnace at the stage, so that the convolution area form analysis is obtained.
Most of the research on the tuyere raceway exists in the analytical research on the tuyere raceway length, the internal combustion form, the temperature field and the like. The research method for the technology adopts the following research means: the method is characterized in that the existing theory is adopted, a computer mathematical modeling method is utilized, the data which can be collected are utilized, the existing related theories such as thermodynamics are combined, theoretical calculation is carried out, and therefore key parameters such as a temperature field in the cyclotron region are analyzed; the method adopts a laboratory simulation method, obtains partial parameters through the experiment of laboratory equipment, and expresses the existence state of the convolution region; furthermore, the method is similar to the method of manually determining the length, the activity degree and the like of the convolution area by means of traditional experience and matching with part of simple measured data according to the production surface condition of the blast furnace. Although the existing technologies have certain reference values and certain applications in practice, it is pointed out that the technologies either lack accurate calculation parameters and have larger analysis result errors; or it is of no reference value for the convolution analysis, and the core parameters of the composition forms important for the tuyere convolution, such as width, height and volume, are still less mentioned, and the accuracy of the analysis remains to be questioned, but more for the length. Therefore, it is further desired to find a reliable and practical method for accurately understanding the frame structure of the tuyere raceway in the blast furnace so as to provide a technical reference for improving the operation state of the blast furnace.
And as the black box operation body, under the condition that the internal condition is more complicated, for the clear grasp blast furnace running state to for rationally operating provide necessary technical reference, still need expand and carry out the analysis to wind gap convolution area form. The study aiming at the tuyere raceway is mostly carried out on the length of the tuyere raceway by utilizing a tuyere sampling technology, such as: patent CN106767611A discloses a method for measuring the length of a tuyere raceway of a COREX melter-gasifier; patent CN101121949A, discloses a method for measuring the length of a blast furnace convolution zone; patent CN204022856U discloses a length measuring device for a tuyere raceway of a blast furnace, in which the length of the raceway is determined by finding out the points of the coke mutations (note: the variation positions of the coke particle size, the coke porosity, etc.) at the hearth part through the methods of actual measurement and theoretical analysis in such documents, which has strong practical significance and is relatively accurate, and is applied to many metallurgical enterprises, and the result thereof can also be used as a basis for determining the length of the raceway. Furthermore, the internal form of the convolution region is obtained by a theoretical calculation method and a numerical modeling method by using a computer, such as: patent CN113343440A discloses a method for constructing a three-dimensional temperature field of a blast furnace tuyere raceway based on image data; the patent CN113283079A discloses a method for calculating and monitoring the boundary of a tuyere raceway of a blast furnace in real time; patent CN106815405A, discloses a method and a system for calculating the depth of a blast furnace tuyere raceway; patent CN113177364A discloses a modeling method for soft measurement of temperature in a tuyere raceway of a blast furnace; the patent CN104457606A discloses a blast furnace convolution area imaging system and imaging method, these inventions create, establish a three-dimensional temperature field model of a tuyere convolution area through image data, firstly obtain method technologies such as image information in the blast furnace tuyere convolution area, or establish a depth calculation model of the convolution area according to the formation principle of the blast furnace tuyere convolution area, and then establish a boundary model of the blast furnace tuyere convolution area through the depth model of the blast furnace tuyere convolution area, thereby realizing the judgment on convolution area form. Some other methods and technologies are technologies for analyzing materials in a hearth by using some auxiliary means to further obtain information of a raceway, such as: patent CN107860680A discloses a method for analyzing the grain size composition and slag retention of blast furnace tuyere coke; patent CN108676944A discloses a method for evaluating the degree of coke deterioration in a blast furnace; patent CN205761751U discloses an automatic screening device for tuyere sampling samples, which is a method for analyzing materials in a cyclone region aiming at the materials taken in a furnace by a furnace sampling technology, can obtain information such as tuyere coke particle size distribution, slag retention and the like, and can further adjust a raw material blending scheme such as coking coal and ore according to an analysis result, thereby realizing stable and smooth operation of a blast furnace. In addition, CN109487023A discloses a method for judging the working state of a furnace hearth; patent CN110343795A discloses a quantitative characterization method for blast furnace hearth activity; patent CN106834572A discloses a hearth activity quantification method for monitoring the activity of a blast furnace hearth; patent CN112111617A discloses a method for quantitatively evaluating activity index of blast furnace hearth, which adopts means such as calculation, and provides more judgment basis for realizing multi-angle and all-around monitoring of hearth activity state by integrating new furnace temperature forecasting model, physical thermal index model, theoretical combustion temperature calculation optimization model, hearth working tapping index model, copper cooling wall hot surface condition calculation model, rist operating line calculation model, etc., thereby reflecting hearth region activity degree and state, and improving important judgment basis and technical basis for guiding lower regulation of blast furnace. However, although it can be said that such techniques are in a rare connection with the lower convolution of the furnace body, there is still no specific analysis method for the convolution.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for analyzing the width of a tuyere raceway by using a hearth sampling means, a large tuyere sampler is adopted for sampling, physical properties of materials in a furnace are analyzed to obtain partial parameters of the materials, the width of the tuyere raceway is analyzed by combining blast furnace operation data, and the width of the tuyere raceway of different effective furnace capacities is accurately analyzed, so that necessary technical reference is provided for evaluating the activity of the blast furnace, and the aim of improving the operation state of the blast furnace is fulfilled.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for analyzing the width of a tuyere raceway by utilizing a hearth sampling means comprises the following steps:
1) Sampling blast furnaces with different effective furnace volumes within the damping-down time of the blast furnaces
Feeding the sampling pipe into the furnace hearth along the radial direction of the tuyere, and sampling in a tuyere convolution area and a dead material column at the position of the furnace hearth; wherein the material taken by the sampling tube is divided equidistantly from the side of the dead material column; then numbering according to different sampling positions;
2) The sample in the step 1) is magnetically attracted to sort out coke and iron slag in different samples, and the retention quantity of the coke and the iron slag in different sampling positions in the furnace is distinguished; screening the coke to obtain the particle size fraction and the quality of the coke at different sampling positions and obtain the average particle size of the coke at corresponding positions;
3) Drawing a coke grain size change trend line from the side of a furnace wall to the radial depth of a furnace core part by taking an abscissa as a sampling position and an ordinate as an average particle size of coke in the furnace as a coordinate axis, taking the position with the maximum slope of the coke grain size change trend line in the furnace as a boundary basis for judging a convolution area and a dead charge column, distinguishing an air outlet convolution area and a dead charge column area, and recording the convolution area length and the dead charge column length under the radius of a furnace cylinder;
4) The retention quantity of coke and iron slag in the rotary area and the dead material column area is calculated to obtain the retention ratio P of coke and iron slag in the rotary area and the dead material column 1 、P 2 ；
5) The coke particle size statistics of different sampling positions in the convolution area and the dead material column area are carried out, and the average particle size K of the coke in the convolution area and the dead material column is calculated by utilizing a mathematical weighting mode 1 、K 2 ；
6) The convolution width is obtained using the following calculation method:
in the formula (1), W is the width of a tuyere raceway and is mm; k 1 Is the average particle size of coke in the cyclone zone, mm；P 1 Is the retention proportion of the slag iron in the convolution area; k 2 The average particle size of coke in the dead material column is mm; p 2 Is the retention proportion of the slag iron in the dead material column,%; d is the diameter of the air port, mm; HW is the flow of hot air blown in, m 3 Min; WP is the pressure of hot blast, kPa; OER is oxygen enrichment rate of blown hot air,%; PCI is the coal injection ratio per ton of iron, kg/t; a. The 1 Is a constant, the value is 1.03,mm; b 1 Is constant and takes a value of 1.45,mm;
alpha is a dimensional correction coefficient, the value is 0.81 mm -1 (ii) a Beta is a dimensional correction coefficient, the value is 0.45 mm -1 (ii) a Chi is a dimensional correction coefficient and takes the value of 0.57,
delta is a dimensional correction coefficient, and the value of delta is 2.13 t/kg.
D in the step 6) is the average tuyere diameter in the blast furnace production process within one month; HW is the hot air flow in the production process of the blast furnace within one month; WP is the hot air pressure in the blast furnace production process within one month; OER is the oxygen enrichment rate in the production process of the blast furnace within one month; PCI is the coal injection ratio in the production process of the blast furnace within one month.
The effective furnace volume is 1200m 3 ～6000m 3 。
Sampling operation of the blast furnace, and controlling the damping down time of the blast furnace to be not less than 10h.
The diameter of the sampling tube is 100 mm-150 mm, and the length of the sampling tube is 5 m-10 m.
The distance between the sampling positions is 20 cm-50 cm.
The average particle size of the coke in the convolution area and the dead material column is calculated by adopting the average particle size control range of the coke in the convolution area to be more than or equal to 10mm, and the average particle size control range of the coke in the dead material column to be more than or equal to 3mm.
Compared with the prior art, the invention has the beneficial effects that:
the method can analyze the physical properties of the materials in the blast furnace to obtain partial parameters of the materials, and analyze the width of the convolution area by combining with the blast furnace operation data.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the invention is not limited to the following embodiments.
A method for analyzing the height of a tuyere raceway by using a hearth sampling means is characterized in that a tuyere sampler is used for sampling coke and iron slag in a blast furnace, and the blast furnace can be accurately judged by analyzing the height of the tuyere raceway and combining with technical and economic indexes of the blast furnace on the condition and the smelting system of the blast furnace, so that the adjustment of the coke load and the smelting system of the blast furnace is guided.
And (4) obtaining the average tuyere diameter, the hot air flow, the hot air pressure, the oxygen enrichment rate and the coal injection ratio of the blast furnace within one month before the statistical sampling work. The convolution width is obtained by using the following calculation formula:
in the formula (1), W is the width of a tuyere raceway and is mm; k 1 The average particle size of coke in the convolution area is mm; p 1 Is the retention proportion of the slag iron in the convolution area; k 2 The average particle size of coke in a dead material column is mm; p 2 Is the retention proportion of the slag iron in the dead material column,%; d is the diameter of the air port, mm; HW is the flow of hot air blown in, m 3 Min; WP is the hot air blowing pressure, kPa; OER is oxygen enrichment rate of blown hot air,%; PCI is the coal ratio of iron injection per ton, kg/t; a. The 1 Is constant and takes the value of 1.03 mm; b 1 Is constant and takes a value of 1.45,mm;
alpha is dimension correction coefficient, the value is 0.81 mm -1 (ii) a Beta is a dimensional correction coefficient, the value is 0.45 mm -1 (ii) a Chi is a dimensional correction coefficient and takes the value of 0.57,
delta is a dimensional correction coefficient, and the value of delta is 2.13 t/kg.
Example 1 (effective furnace volume 1800m in certain iron and steel works) 3 Blast furnace)
1.1 blast furnace operating parameters
Before sampling, the operation parameters of the average tuyere diameter, the hot air flow, the hot air pressure, the oxygen enrichment rate and the coal injection ratio in the blast furnace production process within one month are counted, and the operation parameters are detailed in table 1.
TABLE 1 blast furnace operating parameters
1.2 blast furnace hearth tuyere sampling
1800m for effective furnace volume of a certain steel plant 3 The blast furnace utilizes a special tuyere sampler and is provided with a detachable special sampling tube, a sampling tube cover plate, a sampling tube support trolley and a special sample storage barrel within 14 hours of damping down time of the blast furnace. The air port sampling machine is hoisted by a crane or automatically driven to reach the air port platform, then is placed in a place in front of the position of the corresponding air port, is externally connected with cooling water by a special air port sampling tube, and meanwhile, is placed in a special storage barrel for samples in the empty place.
Meanwhile, after the tuyere sampler is assembled, a belly pipe and a tuyere of the blast furnace at the position of the sample are removed. Firstly, adopting a track self-propelled mode of the tuyere sampler, feeding the sampling tube into a tuyere convolution area, then placing a sampling tube support trolley below the sampling tube until the sampling tube cannot enter in the track self-propelled mode, fixing the tuyere sampler, and connecting the tuyere sampler with a blast furnace body through a steel rope and a hook. Starting an air port sampler with a motor, forcibly feeding a sampling tube into a dead material column of a furnace cylinder by using a cylinder pressurization mode, enabling the front end of the sampling tube to reach the central position of the dead material column, then extracting a movable sliding plate above the sampling tube, adopting a self-carrying vibration mode, vibrating for 3-5 minutes, extracting the sampling tube inserted into the furnace by using a crawler bicycle in a reverse mode after the dead material column and materials in a convolution area in the furnace fall into the sampling tube, and covering a special sampling tube cover plate on the upper part of the sampling tube extracted out of the furnace body in the process of extracting the sampling tube out of the furnace body so as to prevent coke in the furnace from being exposed in the atmosphere to burn and influence the accuracy of an analysis result.
After the sampling operation in the furnace is completed, the sampling tube connected with the air port sampling machine is detached and placed in the empty position of the air port platform, the material taken out of the sampling tube is divided into intervals according to 30cm, the sampling position is compiled, the material is picked out by using the special sample picking spoon, the material is put into the special storage barrel for the sample, and after the material is cooled for 45 minutes, the material is put into the special sample bag for sealing storage and is numbered for the sample.
1.3 analysis of coke particle size and slag iron ratio
Then, coke and iron slag samples in different samples are manually sorted out by utilizing the magnetic attraction principle of pig iron for materials at different sampling positions in the furnace, and the coke and iron slag samples are respectively subjected to mass weighing and recording, so that the detention quantity of the coke and the iron slag at different sampling positions in the furnace is distinguished. And screening the coke samples at different positions by using combined screens with different grain sizes under the mesh sizes of 30mm, 25mm, 20mm, 15mm, 10mm, 6.5mm, 5mm and 3mm of the screen meshes, sequentially carrying out grain size screening on the coke samples in the furnace, weighing and recording the grain sizes and the masses of the cokes at different sampling positions, and counting the average grain size of the cokes at the positions on the basis.
And aiming at the screening results of the average particle size of the coke at different positions, drawing a trend line of the change of the particle size of the coke in the furnace from the side of the furnace wall to the radial depth of the furnace core part by taking the abscissa as a sampling position and the ordinate as an axis, and taking the maximum slope of the trend line of the change of the particle size of the coke in the furnace as a boundary basis for judging a convolution area and a dead charge column, thereby distinguishing an air outlet convolution area and a dead charge column area. On the basis, the coke and iron slag retention quantity in the convolution area and the dead material column area is counted, and the coke and iron slag retention proportion in the convolution area and the dead material column area is calculated respectively on the basis. The coke particle size and the slag iron retention ratio in the hearth are shown in Table 2.
TABLE 2 Coke particle size and iron slag holdup ratio
1.4 analysis results of the front-end convolution region of the tuyere
After applying the above calculation scheme (formula (1)), the width of the single tuyere raceway can be analyzed, and the results of the raceway width analysis are shown in Table 3.
TABLE 3 tuyere front-end convolution region Width
From the analysis results, the effective furnace volume 1800m is aimed at 3 The calculation result of the width of the convolution area at the front end of the blast furnace tuyere is 83.37mm, which indicates that the width of the convolution area is narrower, namely, the improvement of the running state of the blast furnace can be realized by improving the raw fuel condition and adopting different strengthening smelting measures under the existing running state at the present stage if a better smelting effect is to be obtained.
Example 2 (effective furnace volume 2580m for certain iron and steel works) 3 Blast furnace)
2.1 blast furnace operating parameters
And (4) counting the operation parameters of the average tuyere diameter, the hot air flow, the hot air pressure, the oxygen enrichment rate and the coal injection ratio in the blast furnace production process within one month before sampling operation, wherein the operation parameters are detailed in a table 4.
TABLE 4 blast furnace operating parameters
2.2 blast furnace hearth tuyere sampling
2580m effective furnace volume for certain iron and steel plant 3 Blast furnace, adopting and implementing within 15 hours of damping down time of the blast furnaceSampling was carried out in the same manner as in example 1.
After the sampling operation in the furnace is completed, the sampling tube connected with the air port sampling machine is detached and placed in the empty position of the air port platform, the material taken out of the sampling tube is divided into 25cm intervals, the sampling position is compiled, the material is picked out by using the special sample picking spoon, the material is put into the special storage barrel for the sample, and after the material is cooled for 50 minutes, the material is put into the special sample bag for sealing storage and the sample is numbered.
2.3 analysis of coke particle size and slag iron ratio
The average particle size fraction of the coke at the corresponding position was counted by the same method as in example 1, and the retention ratio of the coke and the iron slag in the swirling area and the dead column was calculated. The coke particle size and the slag iron retention ratio in the hearth are shown in Table 5.
Surface coke 5 carbon particle size and slag iron retention ratio
2.4 analysis results of the front-end convolution region of the tuyere
After applying the above calculation scheme (formula (1)), the width of the single tuyere raceway can be analyzed, and the analysis results of the raceway width are shown in Table 6.
Watch 6 tuyere front-end convolution region width
From the analysis results, the effective furnace volume is 2580m 3 The calculation result of the width of the convolute region at the front end of the blast furnace tuyere is 98.25mm, which indicates that the width of the convolute region is slightly narrow, namely that better smelting effect is required to be obtained, and the improvement of the running state of the blast furnace can be realized by improving the raw fuel condition and adopting different strengthening smelting measures under the existing running state at the present stage.
Example 3 (effective furnace volume 3200m in certain iron and steel works) 3 Blast furnace)
3.1 blast furnace operating parameters
Before sampling, the average tuyere diameter, hot air flow, hot air pressure, oxygen enrichment rate and the operation parameters of the injection coal ratio in the production process of the blast furnace within one month are counted, and the operation parameters are detailed in a table 7.
TABLE 7 blast furnace operating parameters
3.2 blast furnace hearth tuyere sampling
3200m effective furnace volume for certain steel plant 3 The blast furnace was sampled in the same manner as in example 1 during the 15-hour blast time.
After sampling operation in the furnace is completed, the sampling tube connected with the air port sampling machine is dismounted and placed in the empty position of the air port platform, the distance of the materials taken out of the sampling tube is divided according to 35cm, the sampling position is compiled, the materials are picked out by using the special sample picking spoon, then the materials are put into a special sample storage barrel, after the materials are cooled for 40 minutes, the materials are placed into special sample bags for sealing storage, and the samples are numbered.
3.3 analysis of coke particle size and slag iron ratio
The average particle size fraction of the coke at the corresponding position was counted by the same method as in example 1, and the retention ratio of the coke and the iron slag in the raceway and the dead column was calculated. The coke particle size and the slag iron retention ratio in the hearth are shown in Table 8.
TABLE 8 Coke particle size and iron slag holdup ratio
3.4 analysis results of the front-end convolution region of the tuyere
After applying the above calculation scheme (formula (1)), the width of the single tuyere raceway can be analyzed, and the analysis results of the raceway width are shown in Table 9.
Gauge 9 tuyere front end convolution region width
From the analysis results, the effective furnace volume is 3200m 3 The calculation result of the width of the convolution area at the front end of the blast furnace tuyere is 103.48mm, which indicates that the width of the convolution area is slightly narrow, namely that a better smelting effect is required to be obtained, and the improvement of the running state of the blast furnace can be realized by improving the raw fuel condition and adopting different strengthening smelting measures under the existing running state at the present stage.
Example 4 (effective furnace volume 4038m of certain iron and steel works) 3 Blast furnace)
4.1 blast furnace operating parameters
Before sampling, the average tuyere diameter, hot air flow, hot air pressure, oxygen enrichment rate and the operation parameters of the coal injection ratio in the blast furnace production process within one month are counted, and the operation parameters are detailed in a table 10.
TABLE 10 blast furnace operating parameters
4.2 blast furnace hearth tuyere sampling
4038m for effective furnace volume of certain steel plant 3 The blast furnace was sampled in the same manner as in example 1 during a 16-hour blast time.
After sampling operation in the furnace is completed, the sampling tube connected with the air port sampling machine is dismounted and placed in the empty position of the air port platform, the distance of the materials taken out of the sampling tube is divided according to 40cm, the sampling position is compiled, the materials are picked out by using the special sample picking spoon, then the materials are put into a special sample storage barrel, after the materials are cooled for 60 minutes, the materials are placed into special sample bags for sealing storage, and the samples are numbered.
4.3 analysis of coke particle size and slag iron ratio
The average particle size fraction of the coke at the corresponding position was counted by the same method as in example 1, and the retention ratio of the coke and the iron slag in the raceway and the dead column was calculated. The coke particle size and the slag iron retention ratio in the hearth are shown in Table 11.
TABLE 11 Coke particle size and slag iron retention ratio
4.4 analysis results of the front-end convolution region of the tuyere
After applying the above calculation scheme (formula (1)), the width of the single tuyere raceway can be analyzed, and the analysis results of the raceway width are shown in Table 12.
Width of front convolution zone of tuyere of watch 12
From the analysis result, the calculation result of the width of the convolution region at the front end of the tuyere of the blast furnace with the effective furnace volume 4038m3 is 124.34mm, which indicates that the convolution region has a sufficient width and the raw fuel has good quality, and indicates that a good smelting effect is required to be obtained and the corresponding smelting system and the quality level of the raw fuel at the current stage are maintained.
Example 5 (effective furnace volume 5500m in certain iron and steel works) 3 Blast furnace)
5.1 blast furnace operating parameters
Before sampling, the average tuyere diameter, hot air flow, hot air pressure, oxygen enrichment rate and the operation parameters of the injection coal ratio in the production process of the blast furnace within one month are counted, and the operation parameters are detailed in table 13.
TABLE 13 blast furnace operating parameters
5.2 blast furnace hearth tuyere sampling
5500m aiming at effective furnace volume of a certain steel plant 3 Blast furnace, adopting and implementing within 18 hours of damping down time of the blast furnaceSampling was carried out in the same manner as in example 1.
After sampling operation in the furnace is completed, the sampling tube connected with the air port sampling machine is dismounted and placed in the empty position of the air port platform, the distance of the materials taken out of the sampling tube is divided according to 30cm, the sampling position is compiled, the materials are picked out by using the special sample picking spoon, then the materials are put into a special sample storage barrel, after the materials are cooled for 60 minutes, the materials are placed into special sample bags for sealing storage, and the samples are numbered.
5.3 analysis of coke particle size and slag iron ratio
The average particle size fraction of the coke at the corresponding position was counted by the same method as in example 1, and the retention ratio of the coke and the iron slag in the raceway and the dead column was calculated. The coke particle size and the slag iron retention ratio in the hearth are shown in Table 14.
TABLE 14 Coke particle size and slag iron retention ratio
5.4 analysis results of the front-end convolution region of the tuyere
After applying the above calculation scheme (formula (1)), the width of the single tuyere raceway can be analyzed, and the analysis results of the raceway width are shown in Table 15.
Watch 15 tuyere front-end convolution region width
From the analysis results, the effective furnace volume is 5500m 3 The calculation result of the width of the convolution area at the front end of the blast furnace tuyere is 131.83mm, which indicates that the width of the convolution area is still enough and the quality of the raw fuel is better, and indicates that a better smelting effect is to be obtained and the corresponding smelting system and the quality level of the raw fuel at the current stage are maintained.
Claims (7)
1. A method for analyzing the width of a tuyere raceway by utilizing a hearth sampling means is characterized by comprising the following steps of:
1) Sampling blast furnaces with different effective furnace volumes within the damping down time of the blast furnaces
Feeding the sampling pipe into the furnace hearth along the radial direction of the tuyere, and sampling in a tuyere convolution area and a dead material column at the position of the furnace hearth; wherein the material taken by the sampling tube is divided equidistantly from the side of the dead material column; then numbering according to different sampling positions in sequence;
2) The sample in the step 1) is magnetically attracted to sort out coke and iron slag in different samples, and the retention quantity of the coke and the iron slag in different sampling positions in the furnace is distinguished; screening the coke to obtain the particle size and the quality of the coke at different sampling positions and obtain the average particle size of the coke at the corresponding position;
3) Drawing a coke grain size change trend line from the side of a furnace wall to the radial depth of a furnace core part by taking an abscissa as a sampling position and an ordinate as an average particle size of coke in the furnace as a coordinate axis, taking the position with the maximum slope of the coke grain size change trend line in the furnace as a boundary basis for judging a convolution area and a dead charge column, distinguishing an air outlet convolution area and a dead charge column area, and recording the convolution area length and the dead charge column length under the radius of a furnace cylinder;
4) The retention quantity of coke and iron slag in the rotary area and the dead material column area is calculated to obtain the retention ratio P of coke and iron slag in the rotary area and the dead material column 1 、P 2 ；
5) The coke particle size statistics of different sampling positions in the convolution area and the dead material column area are carried out, and the average particle size K of the coke in the convolution area and the dead material column is calculated by utilizing a mathematical weighting mode 1 、K 2 ；
6) The convolution width is obtained using the following calculation method:
in the formula (1), W is the width of a tuyere raceway and is mm; k is 1 The average particle size of the coke in the convolution area is mm; p 1 The retention ratio of the slag iron in the convolution area is percent; k 2 The average particle size of coke in a dead material column is mm; p 2 To death ofThe retention ratio of slag iron in the material column is percent; d is the diameter of the tuyere and mm; HW is the flow of hot air blown in, m 3 Min; WP is the pressure of hot blast, kPa; OER is oxygen enrichment rate of blown hot air,%; PCI is the coal injection ratio per ton of iron, kg/t; a. The 1 Is constant and takes the value of 1.03 mm; b is 1 Is constant and takes a value of 1.45,mm;
alpha is dimension correction coefficient, the value is 0.81 mm -1 (ii) a Beta is a dimensional correction coefficient, the value is 0.45 mm -1 (ii) a Chi is a dimensional correction coefficient and takes the value of 0.57,
delta is a dimensional correction coefficient, and the value of delta is 2.13 t/kg.
2. The method for analyzing the width of the tuyere raceway by means of hearth sampling according to claim 1, wherein D in the step 6) is an average tuyere diameter in a blast furnace production process within one month; HW is the average hot air flow in the production process of the blast furnace within one month; WP is the average hot air pressure in the blast furnace production process within one month; OER is the average oxygen enrichment rate in the production process of the blast furnace within one month; PCI is the average injected coal ratio in the production process of the blast furnace within one month.
3. The method of claim 1, wherein the effective furnace volume is 1200m 3 ～6000m 3 。
4. The method of claim 1, wherein the sampling operation of the blast furnace is performed by controlling the damping down time of the blast furnace to be not less than 10 hours.
5. The method for analyzing the width of the tuyere raceway by means of hearth sampling according to claim 1, wherein said sampling tube has a diameter of 100mm to 150mm and a length of 5m to 10m.
6. The method for analyzing the width of the tuyere raceway by means of the hearth sampling as set forth in claim 1, wherein the sampling positions are spaced apart by a distance of 20cm to 50cm.
7. The method for analyzing the width of the tuyere raceway by means of sampling from a hearth according to claim 1, wherein the average particle size of the coke in the raceway and in the dead leg is calculated by controlling the average particle size of the coke in the raceway to be not less than 10mm and controlling the average particle size of the coke in the dead leg to be not less than 3mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008240028A (en) * | 2007-03-26 | 2008-10-09 | Jfe Steel Kk | Method for operating blast furnace |
| CN106248518A (en) * | 2016-08-10 | 2016-12-21 | 武汉钢铁股份有限公司 | Coke is the evaluation methodology of degradation in blast furnace |
| CN108676944A (en) * | 2018-05-11 | 2018-10-19 | 武汉钢铁有限公司 | A kind of coke degradation degree evaluation method in blast furnace |
| CN113283079A (en) * | 2021-05-24 | 2021-08-20 | 东北大学 | Method for calculating and monitoring boundary of blast furnace tuyere raceway in real time |
-
2022
- 2022-03-31 CN CN202210329206.3A patent/CN114752717B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008240028A (en) * | 2007-03-26 | 2008-10-09 | Jfe Steel Kk | Method for operating blast furnace |
| CN106248518A (en) * | 2016-08-10 | 2016-12-21 | 武汉钢铁股份有限公司 | Coke is the evaluation methodology of degradation in blast furnace |
| CN108676944A (en) * | 2018-05-11 | 2018-10-19 | 武汉钢铁有限公司 | A kind of coke degradation degree evaluation method in blast furnace |
| CN113283079A (en) * | 2021-05-24 | 2021-08-20 | 东北大学 | Method for calculating and monitoring boundary of blast furnace tuyere raceway in real time |
Non-Patent Citations (3)
| Title |
|---|
| 张立国 ; 刘德军 ; 张磊 ; 张海明 ; 范振夫 ; 刘宝奎 ; .高炉风口直径和风口焦炭粒度对高炉影响规律的研究.2006,(第01期),第7-10页. * |
| 郭同来 ; 柳政根 ; 储满生 ; .高炉喷吹焦炉煤气风口回旋区的数学模拟.2012,第33卷(第07期),第987-991页. * |
| 郭术义 ; 孙志强 ; .利用CFX对高炉回旋区的模拟研究.2008,第33卷(第04期),第301-304页. * |
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