CN112322811A - Method and device for judging falling of material distribution chute at top of blast furnace - Google Patents
Method and device for judging falling of material distribution chute at top of blast furnace Download PDFInfo
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- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
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Abstract
The invention provides a method for judging falling of a material distribution chute at the top of a blast furnace, which comprises the following steps: before and after the blast furnace is fed through the distribution chute, furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute are respectively obtained; judging the furnace top temperature change condition of the blast furnace according to the furnace top temperature form data, judging the state change condition of the mechanical trial rod according to the mechanical trial rod data, judging the gas flow change condition in the blast furnace according to the infrared imaging data, judging the temperature change condition of the edge and the center of the blast furnace according to the furnace temperature distribution data, judging the load change condition of the motor according to the current data of the motor, and judging whether the material distribution chute on the furnace top of the blast furnace falls off or not. The invention can quickly and accurately judge whether the distribution chute falls off.
Description
Technical Field
The invention belongs to the technical field of blast furnace top distribution, and particularly relates to a method and a device for judging falling of a distribution chute at the top of a blast furnace.
Background
Since the 21 st century, with the continuous development and progress of blast furnace iron-making technology and smelting efficiency, blast furnaces tend to be large-sized continuously, and bell-less furnace top distribution chute technology is rapidly and widely popularized due to the advantages of accurate, flexible and reliable distribution since the birth date of the bell-less furnace top distribution chute technology. In the blast furnace smelting process, a high-temperature, high-pressure and closed black box which can simultaneously have solid, liquid and gas three-state reactions is arranged in the black box. The distribution chute is arranged on the top of the blast furnace and connected with the airtight box, the schematic diagram of the distribution chute can refer to fig. 1 and fig. 2, the upper end of the throat is connected with the charging bucket, the lower end of the throat sends coke and mineral aggregate into the distribution chute, and the hanging shaft passes through the distribution chute and the throat to fix the distribution chute. The working environment of the distribution chute is extremely severe, on one hand, the distribution chute is washed by a large amount of coal gas and a large amount of dust which are generated in the smelting process of the blast furnace and have high temperature (the average temperature is below 250 ℃, and the local highest temperature can reach 1000 ℃), high pressure (200-300 kPa), and on the other hand, the distribution chute is continuously placed into the furnace from a top material tank of the furnace to smash the coke and the mineral aggregate to the distribution chute. In addition, when the blast furnace is in an abnormal furnace condition, accidents such as pipelines, material collapse, material hanging, deep footage and the like are often generated, the top temperature is abnormally increased in a short time, and a large amount of water needs to be injected into the furnace in a short time for cooling in order to protect relevant equipment, so that the distribution chute bears huge temperature change.
As shown in the document "zhangweiwei" and the research on the life of large-sized blast furnace distribution chutes (university of yanshan university, university of masters academic thesis, 5 months 2018, P13), the distribution chutes have various failure modes in long-term use, mainly impact wear failure, high-temperature deformation failure, liner plate or fixed platen falling failure, and most serious distribution chute falling into the blast furnace inner cavity.
In the blast furnace smelting process, the falling of the distribution chute (the falling caused by serious burning deformation and cracking of a chute suspension arm and a hanging shaft as shown in fig. 3) can not be judged in time, which often brings huge loss to the blast furnace production, and not only can the distribution chute be in a low-yield state for a long time, but also can serious accidents such as gas abnormality, furnace cooling and the like can be caused. Although only a few small and medium-sized blast furnaces are provided with a blast furnace scanning radar charge level measuring device at present, the working state of a distribution chute can be judged by discontinuously scanning the shape of the charge level of the furnace top when the distribution is stopped, the equipment is damaged after the equipment is used for a period of time (particularly, the blast furnace is overhauled), and the long-time stable operation cannot be realized.
Therefore, a method for rapidly judging the falling off of the distribution chute at the top of the blast furnace is needed, so that the judgment can be rapidly, accurately and simply carried out in a very short time after the falling off of the distribution chute, and the distribution chute is replaced by stopping wind.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for judging the falling of a distribution chute at the top of a blast furnace, which can quickly and accurately judge whether the distribution chute falls off.
The invention provides a method for judging falling of a material distribution chute at the top of a blast furnace, which comprises the following steps:
before and after the blast furnace is charged through a distribution chute, furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute are respectively obtained;
judging the furnace top temperature change condition of the blast furnace before and after charging the blast furnace according to the furnace top temperature form data, and judging the state change condition of the mechanical trial rod before and after charging the blast furnace according to the mechanical trial rod data, and also judges the gas flow change condition in the blast furnace before and after the blast furnace is charged according to the infrared imaging data, and judging the temperature change conditions of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace, and judging the temperature change conditions of the edge and the center of the blast furnace before and after charging the blast furnace according to the current data of the motor, and judging whether the blast furnace top distribution chute falls off or not according to the change condition of the furnace top temperature, the change condition of the state of the mechanical stock rod, the change condition of the gas flow, the change conditions of the temperature of the edge and the center of the blast furnace and the change condition of the load of the motor.
Preferably, the determining, according to the furnace top temperature form data, a change of the furnace top temperature of the blast furnace before and after charging the blast furnace, includes:
and judging whether the temperature fluctuation amplitude value of the furnace top is smaller than a first preset value before and after the blast furnace is charged according to the furnace top temperature form data, judging whether the reduction amplitude value of the furnace top temperature after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is continuously larger than a second preset value in a preset time period, judging whether the temperature deviation among the positions of a plurality of gas pipes in the furnace top is larger after the blast furnace is charged relative to the blast furnace before the blast furnace is charged, and determining that the first state that the distribution chute falls off exists if the temperature deviation is larger.
Preferably, the determining, according to the mechanical stock rod data, a state change of the mechanical stock rod before and after charging the blast furnace includes:
and judging whether the mechanical stock rod of the blast furnace has a continuous sliding rule phenomenon or not according to the mechanical stock rod data, and if so, determining that a second state that the distribution chute falls off exists.
Preferably, the determining, according to the infrared imaging data, a change of gas flow in the blast furnace before and after charging the blast furnace includes:
and judging whether the furnace top infrared imaging has a central fire or not after the blast furnace is charged and whether the brightness enhancement value of the blast furnace edge infrared imaging after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is larger than a third preset value or not according to the infrared imaging data, and determining that the gas is diffused from the center of the blast furnace to the edge and the third state that the distribution chute falls off exists when the furnace top infrared imaging has no central fire and the brightness enhancement value is larger than the third preset value.
Preferably, the determining, according to the furnace temperature distribution data, the temperature change of the edge and the center of the blast furnace before and after charging the blast furnace includes:
and judging whether the amplitude value of the edge temperature of the blast furnace after the blast furnace is charged relative to the amplitude value of the edge temperature of the blast furnace before the blast furnace is charged is larger than a fourth preset value or not and whether the amplitude value of the center temperature of the blast furnace after the blast furnace is charged relative to the amplitude value of the edge temperature of the blast furnace before the blast furnace is charged is larger than a fifth preset value or not according to the temperature distribution data in the blast furnace, and if so, determining that a fourth state that the material distribution chute falls off exists.
Preferably, the acquiring furnace temperature distribution data of the blast furnace top includes:
and measuring the temperature data of the center and the edge in the blast furnace by using a cross thermometry method.
Preferably, the determining, according to the motor current data, a load change condition of the motor before and after charging the blast furnace includes:
and judging whether the reduction amplitude value of the motor current after the charging of the blast furnace relative to the motor current before the charging of the blast furnace is larger than a sixth preset value or not according to the motor current data, if so, changing the motor current value from a floating value to a fixed value, and determining that a fifth state that the distribution chute falls off exists.
The invention also provides a device for judging the falling of the material distribution chute at the top of the blast furnace, which comprises the following components:
the data acquisition module is used for respectively acquiring furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute before and after the blast furnace is fed through the distribution chute;
a calculation and judgment module for judging the change of the furnace top temperature of the blast furnace before and after charging the blast furnace according to the shape data of the furnace top temperature, judging the change of the mechanical trial rod state before and after charging the blast furnace according to the data of the mechanical trial rod, judging the change of the gas flow in the blast furnace before and after charging the blast furnace according to the infrared imaging data, judging the change of the temperature of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace, judging the change of the load of the motor before and after charging the blast furnace according to the current data of the motor, and judging the change of the load of the top distribution chute of the blast furnace according to the change of the furnace top temperature, the change of the mechanical trial rod state, the change of the gas flow, the change of the temperature of the edge and the center of the blast furnace and the change of the load of the motor Whether or not to fall off.
Preferably, the calculation and judgment module is configured to judge, according to the furnace top temperature form data, whether a temperature fluctuation amplitude value of the furnace top is smaller than a first preset value before and after charging of the blast furnace, whether a reduction amplitude value of the furnace top temperature after charging of the blast furnace relative to the furnace top before charging is continuously larger than a second preset value within a preset time period, and whether a temperature deviation between positions of a plurality of gas pipes in the furnace top is larger after charging of the blast furnace relative to the blast furnace before charging, and if both of the values are larger, determine that the first state in which the distribution chute falls off exists.
Preferably, the calculation and judgment module is configured to judge whether a continuous sliding ruler phenomenon occurs on the mechanical trial rod of the blast furnace according to the mechanical trial rod data, and if yes, determine that a second state in which the distribution chute falls off exists.
The implementation of the invention has the following beneficial effects: the method provided by the invention obtains corresponding furnace top temperature form data of the blast furnace, mechanical trial rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute before and after charging the blast furnace on the basis of fully analyzing the change of five aspects of furnace top temperature form, working state of a mechanical trial rod, gas flow state, furnace temperature distribution form, motor current and the like caused by the falling of the distribution chute, judges whether the distribution chute of the blast furnace falls or not according to the data, the temperature change condition of the furnace top of the blast furnace, the change condition of the mechanical trial rod state, the gas flow change condition, the temperature change condition of the edge and the center of the blast furnace and the load change condition of a motor, and can prepare for judging whether the distribution chute falls or not after adding a first batch material after the distribution chute, the judgment is carried out through the five-dimensional data, the speed is high, the accuracy is high, and the vicious accidents of blast furnace gas abnormality, furnace cooling and the like caused by the fact that the judgment cannot be carried out in time after the distribution chute falls off are avoided.
Drawings
FIG. 1 is a side view of a distribution chute mounting structure in a prior art arrangement;
FIG. 2 is a top view of a prior art distribution chute mounting structure;
FIG. 3 is a schematic view showing the falling of the distribution chute caused by burning, cracking and deformation of the suspension arms and the suspension periphery;
FIG. 4 is a flowchart of a method for determining the falling-off of a material distribution chute at the top of a blast furnace, which is provided by the embodiment of the invention;
FIG. 5 is a graph of temperature at a detection point of a furnace top gas pipe and a graph of data detected by a mechanical probe according to an embodiment of the present invention;
FIG. 6 is a cross temperature measurement distribution comparison graph after a distribution chute has been dropped in accordance with an embodiment of the present invention;
fig. 7 is a comparison diagram of the current of the motor after the distribution chute provided by the embodiment of the invention falls off.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
The invention provides a method for judging falling of a material distribution chute at the top of a blast furnace, which comprises the following steps of:
before and after the blast furnace is fed through the distribution chute, furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute are respectively obtained;
judging the furnace top temperature change condition of the blast furnace before and after charging the blast furnace according to the furnace top temperature form data, and the state change condition of the mechanical stock rod before and after charging the blast furnace is judged according to the data of the mechanical stock rod (or called as a mechanical stock rod for detecting the depth of the material in the furnace), and also judges the gas flow change condition in the blast furnace before and after charging the blast furnace according to the infrared imaging data, and judging the temperature change conditions of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace, and judging the load change condition of the motor before and after charging the blast furnace according to the current data of the motor, and judging whether the blast furnace top distribution chute falls off or not according to the temperature change condition of the top, the state change condition of the mechanical stock rod, the gas flow change condition, the temperature change condition of the edge and the center of the blast furnace and the load change condition of the motor.
In one embodiment, the determining the change of the top temperature of the blast furnace before and after charging the blast furnace according to the top temperature profile data comprises:
according to the furnace top temperature form data, whether the temperature fluctuation amplitude value of the furnace top is smaller than a first preset value before and after the blast furnace is charged is judged, whether the reduction amplitude value of the furnace top temperature after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is continuously larger than a second preset value in a preset time period, whether the temperature deviation among a plurality of gas pipe positions in the furnace top becomes larger after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is judged, and if the temperature fluctuation amplitude value is larger than the second preset value, the first state that the distribution chute falls off exists is determined.
The fluctuation range of the temperature of the furnace top is reduced before and after charging, the temperature of the furnace top is greatly reduced in a short time, the temperature of the furnace top is continuously lower than the normal temperature level of the furnace top, the temperature deviation of temperature measuring points of a plurality of gas pipes in the follow-up furnace top is gradually increased, and the temperature form of the furnace top is diverged, so that the first state that the distribution chute falls off can be determined.
As shown in figure 5, when the chute falls off, the temperature fluctuation range of the temperature curve at the detection point of the furnace top gas pipe is obviously reduced, and the temperature is greatly reduced.
According to mechanical trial rod data, judge for the blast furnace before and after reinforced, the mechanical trial rod state change condition includes:
and judging whether the mechanical stock rod of the blast furnace has the continuous sliding rule phenomenon or not according to the mechanical stock rod data, and if so, determining that a second state that the distribution chute falls off exists.
Referring to fig. 5, the two mechanical trial rod curves in the blast furnace both change obviously when the chute falls off, indicating that the sliding ruler phenomenon occurs.
According to infrared imaging data, judge the gas air current situation of changing in the blast furnace before and after giving the blast furnace reinforced, include:
and judging whether the furnace top infrared imaging has a central fire or not after the blast furnace is charged and whether the brightness enhancement value of the blast furnace edge infrared imaging after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is larger than a third preset value or not according to the infrared imaging data, and determining that the gas is diffused from the center of the blast furnace to the edge and has a third state that the distribution chute falls off when the furnace top infrared imaging does not have the central fire (namely the temperature of the furnace top is lower and the gas flow is very small) and the brightness enhancement value is larger than the third preset value (namely the gas at the edge of the blast furnace is obviously enhanced and appears bright).
After the distribution chute falls off, the blast furnace is fed through the chute, so that the central coal gas of the blast furnace is aggravated and develops towards the edge of the blast furnace, the peripheral coal gas of the edge of the blast furnace is obviously strengthened and becomes bright under infrared imaging, and the infrared imaging of the furnace top has no central fire and the distribution chute cannot be seen.
According to the temperature distribution data in the furnace, the temperature change conditions of the edge and the center of the blast furnace before and after charging the blast furnace are judged, and the method comprises the following steps:
and judging whether the amplitude value of the edge temperature of the blast furnace after the blast furnace is charged is larger than a fourth preset value relative to the amplitude value of the edge temperature of the blast furnace before the blast furnace is charged and whether the amplitude value of the center temperature of the blast furnace after the blast furnace is charged is larger than a fifth preset value relative to the amplitude value of the center temperature of the blast furnace before the blast furnace is charged according to the temperature distribution data in the blast furnace, and if so, determining that a fourth state that the distribution chute falls off exists.
Further, acquiring furnace temperature distribution data of the blast furnace top, comprising:
and measuring the temperature data of the center and the edge in the blast furnace by using a cross thermometry method.
As shown in fig. 6, 1-8 in fig. 6 are eight temperature measurement points adopted by the cross temperature measurement method, where the temperature measurement point No. 1 is a blast furnace edge temperature measurement point, the temperature measurement point No. 8 is a blast furnace center temperature measurement point, and the larger the temperature measurement point number is, the closer to the center of the blast furnace is indicated. As can be seen from fig. 6, when the chute is normal, the temperature of the edge temperature measurement point is lower than that of the central temperature measurement point, and after the chute falls off, the temperature of the edge temperature measurement point is significantly higher than that of the central temperature measurement point.
When the cross thermometry method is adopted, the temperature of the first and second thermometry points at the edge of the blast furnace is obviously increased, and the temperature of the seventh thermometry point close to the center of the blast furnace and the temperature of the central thermometry point are sharply reduced.
According to the motor current data, the load change condition of the motor is judged before and after the charging of the blast furnace, and the load change condition comprises the following steps:
and judging whether the reduction amplitude value of the motor current after the charging of the blast furnace relative to the motor current before the charging of the blast furnace is larger than a sixth preset value or not according to the motor current data, if so, changing the motor current value from a floating value to a fixed value, and determining that a fifth state that the distribution chute falls off exists.
And (4) judging whether the chute falls off or not by combining the first state, the second state, the third state, the fourth state and the fifth state.
Generally, as shown in fig. 7, when the motor current is reduced by 1 to 2A (the daily operating current is 17 to 20A) compared with the normal value and the current curve is a straight line, it can be determined that the material distribution chute is in the fourth state of falling.
Within 1 batch (12 minutes) after the distribution chute falls off, a first state, a second state, a third state and a fourth state exist in the blast furnace, and the falling off of the distribution chute can be judged by combining the four states.
In one embodiment, a blast furnace with the volume of 5500m3 is selected, the circumferential radius of the top of the blast furnace is 5.6 meters, the length of a chute is 4.5 meters, circular chutes are adopted for distributing materials, the tilting angle working range of the distribution chute is 9-48 degrees, and a platform funnel type central coking distribution mode is adopted.
A typical cloth matrix is shown in table 1 below. A complete batch comprises a tank of coke and a tank of ore, and the coke and ore placed into the blast furnace in each tank need to be distributed by the distribution chute at set weight, material line, angle and number of turns.
TABLE 1
Note: the distribution alpha angle is a tilting angle of the distribution chute, wherein 12 is a maximum angle, and the angles are sequentially from 1 to the minimum angle.
In this example, the weight of the ore is 90-180 tons, the weight of the coke is 28-50 tons, the material line is 1.3-1.8 m, and the material distribution adopts a continuous and alternate material distribution mode of one coke tank and one ore tank.
Under the normal operating condition of the distribution chute: the furnace top four-point temperature (the temperature of the lower parts of four gas ascending pipes distributed on the furnace top) shows regular fluctuation after charging and scaling (mechanical measuring rod), and the wave amplitude is between 100 and 250 ℃; the mechanical stock rod works well, and the stock rod slowly descends at a certain speed after the stock rod is extended, so that the phenomenon of continuous sliding or material collapse is avoided; the top gas is distributed in a stable central open mode, namely the temperature of a cross temperature measuring central point of a furnace throat is high (400-850 ℃) and the temperature of an edge point is low (50-180 ℃); the rated power of a beta-angle motor of the airtight box is 22KW, the rated current is 43A, the daily working current is stabilized between 17-20A, and a beta-angle motor current operation monitoring curve is established; wherein, the beta angle motor is used for providing transportation power for the distribution chute. The infrared imaging of the furnace throat shows that the central fire of the furnace throat is strong, bright and stable except for the coke in the center of the cloth.
If the distribution chute falls off, the furnace burden is completely added to the central area, the charge level form is immediately changed, the temperature distribution in the furnace is further changed, and the mechanical stock rod has an obvious continuous sliding rod phenomenon, so that the judgment can be carried out by the method provided by the invention.
By adopting the method, the rapid and accurate judgment can be carried out in a very short time after the distribution chute falls off, and the vicious accidents of blast furnace gas abnormality, furnace cooling and the like caused by the fact that the judgment cannot be carried out in time after the distribution chute falls off are avoided.
The invention also provides a device for judging the falling of the material distribution chute at the top of the blast furnace, which comprises: the device comprises a data acquisition module and a calculation judgment module.
The data acquisition module is used for respectively acquiring furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute before and after the blast furnace is fed through the distribution chute.
The calculation and judgment module is used for judging the change condition of the furnace top temperature of the blast furnace before and after charging the blast furnace according to the data of the furnace top temperature form, judging the change condition of the state of the mechanical trial rod before and after charging the blast furnace according to the data of the mechanical trial rod, judging the change condition of the gas flow in the blast furnace before and after charging the blast furnace according to the infrared imaging data, judging the change condition of the temperature of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace, judging the change condition of the load of the motor before and after charging the blast furnace according to the current data of the motor, and judging whether the material distribution chute of the blast furnace falls off or not according to the change condition of the furnace top temperature, the change condition of the state of the mechanical trial rod, the change condition of the gas flow, the change condition of the temperature of the edge and the center of.
In one embodiment, the calculation and judgment module is used for judging whether the temperature fluctuation amplitude value of the furnace top is smaller than a first preset value before and after the blast furnace is charged according to the furnace top temperature form data, whether the reduction amplitude value of the furnace top temperature after the blast furnace is charged relative to the blast furnace before the charging is continuously larger than a second preset value in a preset time period, and whether the temperature deviation among the positions of a plurality of gas pipes in the furnace top is larger after the blast furnace is charged relative to the blast furnace before the charging, and if so, determining that a first state that the distribution chute falls off exists.
The calculation and judgment module can also be used for judging whether the mechanical stock rod of the blast furnace has the continuous sliding rule phenomenon or not according to the mechanical stock rod data, and if so, determining that the second state that the distribution chute falls off exists.
The calculation and judgment module can also be used for judging whether the furnace top infrared imaging has a central fire or not after the blast furnace is charged and whether the brightness enhancement value of the blast furnace edge infrared imaging after the blast furnace is charged relative to the blast furnace before the charging is larger than a third preset value or not according to the infrared imaging data, and when the furnace top infrared imaging does not have the central fire (namely the temperature of the furnace top is lower and the gas flow is very small) and the brightness enhancement value is larger than the third preset value (namely the gas at the edge of the blast furnace is obviously enhanced and appears bright), determining that the gas diffuses from the center of the blast furnace to the edge and a third state that the distribution chute falls off exists.
In summary, the method and the device for judging the falling of the blast furnace top distribution chute provided by the invention obtain corresponding furnace top temperature form data of the blast furnace, mechanical trial rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute before and after charging the blast furnace on the basis of fully analyzing five changes of furnace top temperature form, mechanical trial rod working state, gas flow state, furnace temperature distribution form and motor current caused by the falling of the distribution chute, judge whether the blast furnace top distribution chute falls or not according to the data, temperature change condition of the blast furnace top, mechanical trial rod state change condition, gas flow change condition, temperature change condition of the edge and the center of the blast furnace and load change condition of the motor, the judging method can be used for preparing to judge whether the distribution chute falls off or not after the first batch is added after the distribution chute falls off, and the judgment is carried out through five dimensional data, so that the method is quick and accurate, and avoids vicious accidents such as blast furnace gas abnormality, furnace cooling and the like caused by the fact that the judgment cannot be carried out in time after the distribution chute falls off.
The judging method of the invention comprehensively considers the falling of the distribution chute, when the blast furnace is charged, the middle of the blast furnace can be quickly filled with materials, which causes great change of the temperature form of the furnace top, because the materials are suddenly accumulated, the working state of the mechanical stock rod can also be changed, when the blast furnace is subjected to infrared imaging, because of the large accumulation of the materials, the imaging center corresponding to the furnace top of the blast furnace can not see gas fire, the gas can diffuse to the edge of the blast furnace, which causes the edge temperature to rise, and the load of the motor stops working, and the current of the motor is maintained at a constant value after being reduced, therefore, the detected data is combined, and whether the distribution chute falls or not can be comprehensively judged.
The above description is only exemplary of the present invention and should not be construed as limiting the scope of the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for judging falling of a material distribution chute at the top of a blast furnace is characterized by comprising the following steps:
before and after the blast furnace is charged through a distribution chute, furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute are respectively obtained;
judging the furnace top temperature change condition of the blast furnace before and after charging the blast furnace according to the furnace top temperature form data, and judging the state change condition of the mechanical trial rod before and after charging the blast furnace according to the mechanical trial rod data, and also judges the gas flow change condition in the blast furnace before and after the blast furnace is charged according to the infrared imaging data, and judging the temperature change conditions of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace, and judging the temperature change conditions of the edge and the center of the blast furnace before and after charging the blast furnace according to the current data of the motor, and judging whether the blast furnace top distribution chute falls off or not according to the change condition of the furnace top temperature, the change condition of the state of the mechanical stock rod, the change condition of the gas flow, the change conditions of the temperature of the edge and the center of the blast furnace and the change condition of the load of the motor.
2. The method for judging the falling of the blast furnace top distribution chute according to claim 1, wherein the step of judging the change condition of the top temperature of the blast furnace before and after charging the blast furnace according to the top temperature form data comprises the following steps:
and judging whether the temperature fluctuation amplitude value of the furnace top is smaller than a first preset value before and after the blast furnace is charged according to the furnace top temperature form data, judging whether the reduction amplitude value of the furnace top temperature after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is continuously larger than a second preset value in a preset time period, judging whether the temperature deviation among the positions of a plurality of gas pipes in the furnace top is larger after the blast furnace is charged relative to the blast furnace before the blast furnace is charged, and determining that the first state that the distribution chute falls off exists if the temperature deviation is larger.
3. The method for judging the falling of the blast furnace top distribution chute according to claim 1, wherein the step of judging the state change of the mechanical measuring rod before and after the charging of the blast furnace according to the data of the mechanical measuring rod comprises the following steps:
and judging whether the mechanical stock rod of the blast furnace has a continuous sliding rule phenomenon or not according to the mechanical stock rod data, and if so, determining that a second state that the distribution chute falls off exists.
4. The method for determining the falling of the blast furnace top distribution chute according to claim 1, wherein the determining the change of the gas flow in the blast furnace before and after the charging of the blast furnace according to the infrared imaging data comprises:
and judging whether the furnace top infrared imaging has a central fire or not after the blast furnace is charged and whether the brightness enhancement value of the blast furnace edge infrared imaging after the blast furnace is charged relative to the blast furnace before the blast furnace is charged is larger than a third preset value or not according to the infrared imaging data, and determining that the gas is diffused from the center of the blast furnace to the edge and the third state that the distribution chute falls off exists when the furnace top infrared imaging has no central fire and the brightness enhancement value is larger than the third preset value.
5. The method for judging the falling of the blast furnace top distribution chute according to claim 1, wherein the judging the temperature change of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace comprises:
and judging whether the amplitude value of the edge temperature of the blast furnace after the blast furnace is charged relative to the amplitude value of the edge temperature of the blast furnace before the blast furnace is charged is larger than a fourth preset value or not and whether the amplitude value of the center temperature of the blast furnace after the blast furnace is charged relative to the amplitude value of the edge temperature of the blast furnace before the blast furnace is charged is larger than a fifth preset value or not according to the temperature distribution data in the blast furnace, and if so, determining that a fourth state that the material distribution chute falls off exists.
6. The method for judging the falling of the blast furnace top distribution chute according to claim 5, wherein the step of acquiring furnace temperature distribution data of the blast furnace top comprises the following steps:
and measuring the temperature data of the center and the edge in the blast furnace by using a cross thermometry method.
7. The method for judging the falling of the blast furnace top distribution chute according to claim 1, wherein the judging the load change condition of the motor before and after the charging of the blast furnace according to the motor current data comprises:
and judging whether the reduction amplitude value of the motor current after the charging of the blast furnace relative to the motor current before the charging of the blast furnace is larger than a sixth preset value or not according to the motor current data, if so, changing the motor current value from a floating value to a fixed value, and determining that a fifth state that the distribution chute falls off exists.
8. The utility model provides a judge device that blast furnace roof distribution chute drops which characterized in that includes:
the data acquisition module is used for respectively acquiring furnace top temperature form data of the blast furnace, mechanical stock rod data of the blast furnace, infrared imaging data of the blast furnace, furnace temperature distribution data of the blast furnace and motor current data for providing transportation power for the distribution chute before and after the blast furnace is fed through the distribution chute;
a calculation and judgment module for judging the change of the furnace top temperature of the blast furnace before and after charging the blast furnace according to the shape data of the furnace top temperature, judging the change of the mechanical trial rod state before and after charging the blast furnace according to the data of the mechanical trial rod, judging the change of the gas flow in the blast furnace before and after charging the blast furnace according to the infrared imaging data, judging the change of the temperature of the edge and the center of the blast furnace before and after charging the blast furnace according to the temperature distribution data in the furnace, judging the change of the load of the motor before and after charging the blast furnace according to the current data of the motor, and judging the change of the load of the top distribution chute of the blast furnace according to the change of the furnace top temperature, the change of the mechanical trial rod state, the change of the gas flow, the change of the temperature of the edge and the center of the blast furnace and the change of the load of the motor Whether or not to fall off.
9. The device for judging the falling of the blast furnace top distribution chute according to claim 8, wherein the calculation and judgment module is configured to judge whether a temperature fluctuation amplitude value of the furnace top is smaller than a first preset value before and after the blast furnace is charged according to the furnace top temperature form data, whether a reduction amplitude value of the furnace top temperature after the blast furnace is charged relative to the blast furnace before the charging is continuously larger than a second preset value within a preset time period, and whether a temperature deviation between a plurality of gas pipe positions in the furnace top is larger after the blast furnace is charged relative to the blast furnace before the charging is larger, and if both are larger, determine that the first state of the falling of the distribution chute exists.
10. The device for judging the falling of the distribution chute at the top of the blast furnace as claimed in claim 8, wherein the calculation and judgment module is configured to judge whether the mechanical dipstick of the blast furnace has a continuous sliding rule phenomenon according to the data of the mechanical dipstick, and if so, determine that the second state of the falling of the distribution chute exists.
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| CN113031103A (en) * | 2021-02-09 | 2021-06-25 | 鞍钢股份有限公司 | Method for rapidly judging falling-off of furnace top chute of blast furnace |
| CN114058757A (en) * | 2021-11-11 | 2022-02-18 | 武汉钢铁有限公司 | Method for judging abnormal work of distributing device in airtight and invisible environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113031103A (en) * | 2021-02-09 | 2021-06-25 | 鞍钢股份有限公司 | Method for rapidly judging falling-off of furnace top chute of blast furnace |
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