CN107326133B - Blast furnace hot air temperature monitoring method and device - Google Patents
Blast furnace hot air temperature monitoring method and device Download PDFInfo
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- CN107326133B CN107326133B CN201710684100.4A CN201710684100A CN107326133B CN 107326133 B CN107326133 B CN 107326133B CN 201710684100 A CN201710684100 A CN 201710684100A CN 107326133 B CN107326133 B CN 107326133B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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Abstract
The invention discloses a blast furnace hot air temperature monitoring method and a blast furnace hot air temperature monitoring device. The method comprises the following steps: acquiring the actual blast furnace hot air temperature at a preset frequency to obtain a preset number of acquisition points; obtaining actual values of the temperature parameters according to the actual wind temperatures acquired at the acquisition points of the preset number; comparing the actual value of each temperature reference with the corresponding threshold value, if the actual value is within the corresponding threshold value, obtaining a first comparison result value, and otherwise, obtaining a second comparison result value; and comprehensively judging the comparison result value of each temperature parameter to obtain a monitoring result. The device includes: the device comprises a temperature sensor, a temperature acquisition unit, a temperature parameter calculation unit, a threshold comparison unit and a comprehensive judgment unit. The invention provides accurate fine adjustment basis for production operation and macroscopic regulation basis for technical managers by analyzing and comprehensively judging the temperature period, the period temperature difference, the period mean value, the period median and the period deviation, and is an auxiliary technology for promoting the intelligent production of the blast furnace.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking production, in particular to a blast furnace hot air temperature monitoring method and a blast furnace hot air temperature monitoring device.
Background
The blast furnace production process comprises the following steps: iron ore, coke, and a flux for slag formation are charged from the top of the furnace, preheated air is blown from a tuyere at the lower part of the furnace, carbon in an auxiliary fuel such as coke at a high temperature is burned with oxygen in the blown air to produce carbon monoxide, and oxygen in the iron ore is removed during the ascent in the furnace, thereby obtaining iron by reduction. The blast furnace hot air temperature is the temperature at which preheated air is blown in from the tuyere, and is also called the blast temperature. At the current level, the actual wind temperature is uneven, and the constant temperature in an ideal state is not possible. The stable and accurate blast furnace hot air temperature is one of basic condition parameters for stabilizing the operation of the blast furnace.
Chinese application CN85104443A entitled "cross parallel air supply temperature control of blast furnace hot blast stove" filed in 6/13 1985 discloses a cross parallel air supply method for blast furnace hot blast stove, which divides the air supply of each hot blast stove into three stages for blast furnaces equipped with three or more hot blast stoves: early stage air supply, middle stage air supply and later stage air supply. The early-stage air supply of each hot blast stove is connected with the later-stage air supply of the preceding stove, the later-stage air supply is connected with the early-stage air supply of the following stove, the middle-stage air supply is the single-stove air supply of the stove, and the temperature control of the cross parallel air supply is completed by adjusting the gradual opening and gradual closing actions of the cold air flow regulating valves of the hot blast stoves with two parallel air supplies. In the parallel air supply stage, the air mixing butterfly valve is closed, cold air is not mixed into the hot air main pipe, in the single-furnace air supply stage, the cold air flow regulating valve of the hot blast stove is kept fully open, and the air mixing butterfly valve is opened to mix the cold air into the hot air main pipe.
The existing blast furnace hot blast stove temperature control method is an effective method for stabilizing the blast furnace hot blast stove temperature, but in the method, the constant temperature control of hot blast is realized by an oscillation method only through switch action, various parameters for representing the current hot blast temperature change are not detected in real time, the fluctuation degree cannot be judged when fluctuation occurs, prompt cannot be realized when the temperature threshold value is exceeded, and no parameter basis is available, so that the intelligent regulation and control of the blast furnace cannot be realized.
Disclosure of Invention
The invention provides a blast furnace hot air temperature monitoring method and a blast furnace hot air temperature monitoring device which can accurately judge the temperature parameter of the actual blast furnace hot air temperature and provide a basis for blast furnace regulation and control.
In order to solve the technical problem, the invention discloses the following technical scheme:
on the one hand, a blast furnace hot air temperature monitoring method is provided. The method comprises the following steps:
acquiring the actual blast furnace hot air temperature at a preset frequency to obtain a preset number of acquisition points;
obtaining actual values of various temperature parameters according to the actual blast furnace hot air temperatures collected at the preset number of collection points, wherein the various temperature parameters comprise a temperature period, a period temperature difference, a period mean value, a period median and a period deviation;
comparing the obtained actual values of the various temperature references with corresponding preset threshold values to obtain comparison result values, if the actual values are within the corresponding preset threshold values, obtaining first comparison result values representing corresponding comparison results, and if not, obtaining second comparison result values representing corresponding comparison results;
and comprehensively judging the obtained comparison result values of the temperature parameters to obtain a blast furnace hot air temperature monitoring result.
For the blast furnace hot air temperature monitoring method, obtaining the predetermined number of collection points further comprises: and outputting a corresponding relation curve of the temperature collected at each collection point and the collection time.
For the blast furnace hot air temperature monitoring method, obtaining the actual values of the temperature parameters further comprises: temperature cycle = interval time between adjacent collection points with substantially increased temperature, cycle temperature difference = highest temperature within temperature cycle-lowest temperature within temperature cycle, cycle mean = mean of all collected temperatures within temperature cycle, cycle median = median of all collected temperature values within temperature cycle, and cycle deviation = absolute value of difference of cycle mean and cycle median.
For the blast furnace hot air temperature monitoring method, the comprehensive judgment of the obtained comparison result values of the temperature parameters further comprises the following steps: and summing the obtained comparison result values of the temperature parameters, and obtaining a blast furnace hot air temperature monitoring result according to the numerical range of the summed values.
For the blast furnace hot air temperature monitoring method, the first comparison result value is 1, and the second comparison result value is 0.
For the above blast furnace hot air temperature monitoring method, the blast furnace hot air temperature monitoring result is normal and does not display data when the total value is 5, the blast furnace hot air temperature monitoring result is fluctuated and displays the actual value and the preset threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 4-3, the blast furnace hot air temperature monitoring result is abnormal and displays the actual value and the threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 2-1, and the blast furnace hot air temperature monitoring result is a fault and displays the actual value and the preset threshold value of each temperature parameter when the total value is 0 or the number of continuous abnormal preset times is predetermined.
For the blast furnace hot air temperature monitoring method, the blast furnace hot air temperature monitoring result includes normal, and also includes at least one of the following types: fluctuations, anomalies, and faults.
The blast furnace hot air temperature monitoring method also comprises the following steps: if the blast furnace hot air temperature monitoring result is normal, monitoring the temperature again according to the current preset threshold value; and if the blast furnace hot air temperature monitoring result is of the other types, searching the reason, and then performing corresponding operation adjustment according to the reason type.
On the other hand, a blast furnace hot air temperature monitoring device is provided. The device includes:
the temperature sensor is used for measuring the temperature of the hot blast air of the blast furnace;
the temperature acquisition unit is used for controlling the temperature sensor 171 to acquire the actual blast furnace hot air temperature at a preset frequency to obtain a preset number of acquisition points;
the parameter calculation unit is used for obtaining actual values of various temperature parameters according to the actual blast furnace hot air temperatures collected at the preset number of collection points, wherein the various temperature parameters comprise a temperature period, a period temperature difference, a period mean value, a period median and a period deviation;
the threshold comparison unit is used for comparing the obtained actual values of the various temperature parameters with corresponding preset thresholds respectively to obtain comparison result values, if the actual values are within the corresponding preset thresholds, a first comparison result value representing a corresponding comparison result is obtained, and if the actual values are not within the corresponding preset thresholds, a second comparison result value representing the corresponding comparison result is obtained;
and the comprehensive judgment unit is used for comprehensively judging the obtained comparison result values of the temperature parameters to obtain a blast furnace hot air temperature monitoring result.
For the blast furnace hot air temperature monitoring device, the temperature sensor is connected with an industrial control microcomputer of the blast furnace through a PLC interface, and the temperature acquisition unit, the parameter calculation unit, the threshold comparison unit and the comprehensive judgment unit are positioned on the industrial control microcomputer.
1) The invention analyzes the temperature parameters such as the temperature period, the period temperature difference, the period mean value, the period median, the period deviation and the like to form comprehensive judgment, provides accurate fine adjustment basis for production operation, provides macroscopic adjustment basis for technical managers and is an effective auxiliary technology for promoting the intelligent production of the blast furnace.
2) The blast furnace hot air temperature monitoring result is obtained through scientific formula calculation and threshold judgment of the temperature parameters, so that empirical operation is avoided, and the actual production efficiency is improved. The invention has simple design and reliable operation, and is suitable for the production, popularization and application of the blast furnace.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention by way of example only and are not to be construed as limiting the embodiments of the invention in any way. In the drawings:
FIG. 1 is a schematic structural diagram of a blast furnace system with a blast furnace hot air temperature monitoring device according to an embodiment of the present invention;
fig. 2 is a flowchart of a blast furnace hot air temperature monitoring method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to be exhaustive or exhaustive. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The terms "first," "second," and the like (if any) herein are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be implemented in other sequences than those illustrated.
In order to meet the requirement of blast furnace operation regulation and control, the invention can quickly form comprehensive judgment by analyzing five temperature parameters of temperature period, period temperature difference, period mean value, period median and period deviation, provides accurate fine adjustment basis for production operation and provides macroscopic regulation and control basis for technical managers.
Fig. 1 is a schematic structural diagram of a blast furnace system with a blast furnace hot blast air temperature monitoring device according to an embodiment of the present invention. The blast furnace system 1 includes: 3 hot-blast furnaces 11, respectively with 3 hot-blast furnace supply air duct 12 of the air outlet intercommunication of each hot-blast furnace, set up each hot-blast furnace supply air duct control valve 13 on each hot-blast furnace supply air duct 12 respectively, the blast furnace 14, connect the blast furnace hot-blast line 15 between 3 hot-blast furnace supply air duct 12 and blast furnace 14, set up the blast furnace hot-blast line control valve 16 on blast furnace hot-blast line 15, and blast furnace hot-blast wind temperature monitoring device 17.
The blast furnace hot air temperature monitoring device 17 includes a temperature sensor 171, a temperature acquisition unit 172, a temperature parameter calculation unit 173, a threshold value comparison unit 174, and a comprehensive judgment unit 175. The temperature sensor 171 is used to measure the temperature of hot blast air in the blast furnace, and the temperature sensor 171 is, for example, a hot blast thermometer. The temperature sensor 171 may be disposed in the blast furnace hot blast duct 15 between the blast furnace hot blast duct control valve 16 and the blast furnace 14. The temperature collecting unit 172 is configured to control the temperature sensor 171 to collect the actual blast furnace hot air temperature at a preset frequency to obtain a predetermined number of collecting points. The parameter calculating unit 173 is configured to obtain actual values of various temperature parameters according to the actual blast furnace hot air temperatures collected at the collection points of the predetermined number, where the various temperature parameters include a temperature period, a period temperature difference, a period mean value, a period median and a period deviation. The threshold comparison unit 174 is configured to compare the obtained actual values of the various temperature parameters with corresponding preset thresholds respectively to obtain comparison result values, obtain a first comparison result value indicating a corresponding comparison result if the actual values are within the corresponding preset thresholds, and obtain a second comparison result value indicating a corresponding comparison result if the actual values are not within the corresponding preset thresholds. The comprehensive judgment unit 175 is configured to comprehensively judge the comparison result values of the obtained temperature parameters to obtain a blast furnace hot air temperature monitoring result.
The temperature sensor 171 may be connected to the industrial microcomputer of the blast furnace 14 through a PLC interface. The temperature acquisition unit 172, the parameter calculation unit 173, the threshold comparison unit 174, and the comprehensive judgment unit 175 may be located on an industrial microcomputer of the blast furnace 14.
The temperature collecting unit 172 is further configured to output a corresponding relationship curve between the temperature collected at each collecting point and the collecting time.
The parameter calculating unit 173 is further configured to calculate actual values of the temperature parameters by the following formula: the temperature cycle = the interval time between adjacent collection points with large temperature rise, and the large temperature rise can be that the temperature difference between the front and the back of the adjacent collection points is more than or equal to 10 ℃; the temperature difference in the cycle = the highest temperature in the cycle-the lowest temperature in the cycle; the cycle mean = the average of all collected temperature values in the cycle; the median of the period = median of all the acquired temperature values within the period. Cycle deviation = absolute value of difference of the cycle mean and the cycle median.
The comprehensive judgment unit 175 is further configured to sum the comparison result values of the obtained temperature parameters, and obtain a blast furnace hot air temperature monitoring result according to a numerical range of the sum value. Assuming that the first comparison result value is 1, the second comparison result value is 0, the blast furnace hot air temperature monitoring result is normal and does not display data when the total value is 5, the blast furnace hot air temperature monitoring result is fluctuated and displays the actual value and the preset threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 4-3, the blast furnace hot air temperature monitoring result is abnormal and displays the actual value and the threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 2-1, and the blast furnace hot air temperature monitoring result is failed and displays the actual value and the preset threshold value of each temperature parameter when the total value is 0 or the predetermined number of continuous abnormalities are provided.
And if the monitoring result is found to be normal, repeatedly monitoring the temperature according to the current preset threshold value. And if the monitoring result is found to be fluctuation, timely searching the reason, and performing corresponding processing according to the reason type after the reason is searched. If the reason is accidental, the factor is eliminated, and if the reason is systematic, a reasonable preset threshold value is set according to the actual condition. If the monitoring result is found to be abnormal, the monitoring interface is closely concerned, for example, the original one-time check in 30 minutes is changed into one-time check in 5-10 minutes, the reason is searched as soon as possible, and corresponding operation adjustment is made. If the monitoring result is found to be 'failure', immediately searching the reason and making corresponding operation adjustment.
Fig. 2 is a flowchart of a blast furnace hot air temperature monitoring method according to an embodiment of the present invention. As shown in fig. 2, the blast furnace hot air temperature monitoring method includes the following steps:
and S101, acquiring the actual blast furnace hot air temperature at a preset frequency to obtain a preset number of acquisition points. The predetermined frequency may be at least 1-2 times per minute. The specific process of temperature acquisition is as follows: the temperature of the blast furnace hot air is acquired on line and input into an industrial control microcomputer, namely, the temperature sensor 171 is adopted, the actual temperature value of the blast furnace hot air is acquired according to the preset frequency through a PLC interface, the actual temperature value is connected into the blast furnace industrial control microcomputer, and a real-time recording curve is drawn, wherein the horizontal axis is time and the vertical axis is temperature. The corresponding relation curve of the temperature collected at each collection point and the collection time can be output on the industrial control microcomputer interface of the blast furnace 14.
Step S102, obtaining actual values of various temperature parameters according to the actual blast furnace hot air temperatures collected at the collection points with the preset number, wherein the various temperature parameters comprise a temperature period, a period temperature difference, a period mean value, a period median and a period deviation. The specific process is as follows: and calculating the actual temperature period, the period temperature difference, the period mean value, the period median and the period deviation according to the calculation formula of each temperature parameter. Wherein the actual value of the temperature cycle is calculated as: the time of the next acquisition time when the temperature of the next acquisition time after the adjacent acquisition point is greatly increased relative to the previous acquisition time is a cycle node, the difference between the acquisition times of the adjacent acquisition points is a temperature cycle value, and the temperature is greatly increased, for example, the temperature difference between the front and the back of the two adjacent temperature acquisition times is more than or equal to 10 ℃. The actual value of the periodic temperature difference is calculated as: and (4) subtracting the lowest temperature in the temperature period from the highest temperature in the temperature period to obtain a period temperature difference value. The actual value of the cycle mean is calculated as: and calculating the average value of all the collected temperature values in the temperature period, wherein the average value is the period average value. The actual value of the median in the cycle is calculated as: and taking the median of all collected temperature values in the temperature period, wherein if the number of the collection points in the temperature period is odd, the median is the temperature collected by the middle collection point, and if the number of the collection points in the temperature period is even, the median is the average value of the temperatures collected by the middle two collection points. The actual value of the period deviation is calculated as: and taking the absolute value of the difference value of the period mean value and the period median as period deviation.
The formula calculation of each temperature parameter can adopt common office software such as Excel or Foxpro and the like or other online monitoring software to edit a calculation formula, and the calculation of a temperature period, a period temperature difference, a period mean value, a period median and a period deviation can be completed through an industrial control microcomputer.
Step S103, comparing the obtained actual values of the various temperature parameters with corresponding preset threshold values respectively to obtain comparison result values, if the actual values are within the corresponding preset threshold values, obtaining first comparison result values representing corresponding comparison results, and if the actual values are outside the corresponding preset threshold values, obtaining second comparison result values representing corresponding comparison results.
The comparison step can be completed by an industrial personal computer, the calculated temperature period, period temperature difference, period mean value, period median and period deviation are logically judged by setting a reasonable preset threshold, and a first comparison result value or a second comparison result value is obtained according to the judgment result.
The method comprises the steps of setting reasonable preset threshold values in advance, wherein the reasonable preset threshold values comprise a preset threshold value of a temperature period, a preset threshold value of a period temperature difference, a preset threshold value of a period mean value, a preset threshold value of a period median and a preset threshold value of a period deviation, determining each preset threshold value according to actual production capacity and process configuration conditions, and adjusting the preset threshold values in time when any one or more of system reason changes, such as iron ore raw material changes, production limitation, production increase, hot blast stove faults and the like.
And editing a logic formula, and performing logic judgment on actual calculated values of the temperature period, the period temperature difference, the period mean value, the period median and the period deviation respectively. If any one of the five temperature parameters, such as the temperature period, is within the corresponding preset threshold, a first comparison result value indicating that the temperature parameter is within the corresponding preset threshold is obtained, and the first comparison result value is, for example, 1. If any one of the five temperature parameters, such as the temperature period, is within the corresponding preset threshold, a second comparison result value indicating that the temperature parameter is outside the corresponding preset threshold is obtained, and the second comparison result value is, for example, 0.
And S104, comprehensively judging the obtained comparison result values of the temperature parameters to obtain a blast furnace hot air temperature monitoring result. The specific process is as follows: and summing up comparison result values of the five parameters, and obtaining a blast furnace hot air temperature monitoring result according to a numerical range of the sum value of the comparison result values, wherein the monitoring result comprises four types of normal, fluctuation, abnormity and fault.
Assume that a first comparison result value indicating that the temperature parameter is within the corresponding preset threshold value is 1, and a second comparison result value indicating that the temperature parameter is outside the corresponding preset threshold value is 0. And summing comparison result values of the temperature period, the period temperature difference, the period mean value, the period median and the period deviation, and displaying a monitoring result and data on a monitoring interface of the blast furnace industrial control microcomputer. The temperature monitoring result is normal and does not display data when the total value is 5, the temperature monitoring result is fluctuation and displays the actual value and the preset threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 4-3, the temperature monitoring result is abnormal and displays the actual value and the preset threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 2-1, and the temperature monitoring result is a fault and displays the actual value and the preset threshold value of five parameters when the total value is 0 or 3-5 times continuously.
This embodiment may further comprise the steps of: and if the monitoring result is found to be normal, repeatedly monitoring the temperature according to the current preset threshold value. And if the monitoring result is found to be fluctuation, timely searching the reason, and performing corresponding processing according to the reason type after the reason is searched. The factors are eliminated if the cause is accidental, and a reasonable preset threshold is fixed according to the actual condition if the cause is systematic. If the monitoring result is found to be abnormal, the monitoring interface is closely concerned, for example, the original one-time check in 30 minutes is changed into one-time check in 5-10 minutes, the reason is searched as soon as possible, and corresponding operation adjustment is made. If the monitoring result is found to be 'failure', immediately searching the reason and making corresponding operation adjustment.
The whole operation process related to the blast furnace hot air temperature monitoring is as follows: opening an industrial control microcomputer related interface of the blast furnace, and setting or adjusting a reasonable preset threshold value according to the actual blast furnace production and process configuration conditions; operating a blast furnace hot air temperature monitoring method; and if the monitoring result is found to be normal, monitoring the blast furnace hot air temperature again according to the current threshold value. And if the monitoring result is found to be fluctuation, timely searching the reason, and performing corresponding processing according to the type of the reason after the reason is searched. If the reason is accidental, the factor is eliminated, and if the reason is systematic, a reasonable preset threshold value is set according to the actual condition. If the monitoring result is found to be abnormal, the monitoring interface is closely concerned, for example, the original one-time check in 30 minutes is changed into one-time check in 5-10 minutes, the reason is searched as soon as possible, and corresponding operation adjustment is made. If the monitoring result is found to be 'failure', immediately searching the reason and making corresponding operation adjustment.
The technical solution of the present invention is further illustrated by the following practical examples.
1080m of ledeburite steel 3 For example, the blast furnace system is provided with three Karu top burning hot blast stoves, which can meet the requirement of 1150-1250 deg.c wind temperature.
Firstly, parameter acquisition. A hot air thermometer is adopted, the actual temperature value of hot air of the blast furnace is collected according to the frequency of 1 time/minute through a PLC interface, the temperature value is accessed to an industrial control microcomputer of the blast furnace, a real-time recording curve is drawn, and the horizontal axis is time and the vertical axis is temperature. For example, table 1 below shows 76 temperature values at 76 collection points obtained by collecting the actual temperature values of the blast furnace hot air at a frequency of 1/min:
table 1 shows an example of data collected from a set of hot blast air temperatures of a blast furnace according to the present invention
And secondly, calculating a formula. The calculation of a temperature cycle, a cycle temperature difference, a cycle mean value, a cycle median and a cycle deviation is completed through an industrial control microcomputer, wherein the temperature cycle = the interval time of adjacent acquisition points with large heating, and the large heating can be that the temperature difference between the front and the back of the adjacent acquisition points is more than or equal to 10 ℃. The cycle temperature difference = highest temperature within the temperature cycle-lowest temperature within the temperature cycle. Cycle mean = average of all collected temperature values over the temperature cycle. Cycle median = median of all collected temperature values within the temperature cycle. Cycle deviation = absolute value of difference of the cycle mean and the cycle median. Of the 76 temperature acquisition points shown in Table 1, acquisition point 11 was the first adjacent substantially elevated temperature acquisition point and acquisition point 71 was the second adjacent substantially elevated temperature acquisition point. Temperature cycle = (71-11) × time interval between adjacent collection points =60 × 1 minute =60 minutes. The cycle mean is the mean of 1202.55 ℃ values for 60 temperature values collected from 60 collection points between collection point 11 and collection point 71. The periodic temperature difference is 49.2 ℃ of the difference between the highest temperature and the lowest temperature of 60 temperature values acquired from 60 acquisition points between the acquisition point 11 and the acquisition point 71. The median cycle number is the average 1202 deg.C of the temperature values for the middle two acquisition points 40 and 41 of the 60 temperature values acquired from 60 acquisition points between acquisition point 11 and acquisition point 71. The period deviation is the absolute value of the difference between the mean and median of the periods at 0.55 ℃.
And thirdly, judging a function. And setting a reasonable preset threshold value, logically judging the actual temperature period, the period temperature difference, the period mean value, the period median and the period deviation obtained by calculation, and outputting a comparison result value under an industrial control microcomputer hot air temperature curve interface. And comparing the actual calculated values of the temperature period, the period temperature difference, the period mean value, the period median and the period deviation with corresponding preset threshold values respectively, wherein the comparison result value is 1 if the actual calculated values are within the corresponding threshold values, and the comparison result value is 0 if the actual calculated values are outside the corresponding threshold values. Reasonable threshold values are preset according to actual production capacity and process configuration conditions, and include a temperature period threshold value, a period temperature difference threshold value, a period mean value threshold value, a period median threshold value and a period deviation threshold value. For example, for the example of Table 1, the threshold for the preset temperature cycle is 58-62 minutes, the threshold for the cycle mean is 1200-1205 ℃, the threshold for the cycle temperature difference is 45-55 ℃, the threshold for the cycle median is 1185-1215 ℃, and the threshold for the cycle deviation is 0-2 ℃. Since the actual value of the temperature cycle, 60 minutes, is within the threshold value of the temperature cycle, 58-62 minutes, the comparison result value of the temperature cycle is 1. Since the actual value 1202.55 deg.C of the cycle mean is within the threshold 1200 deg.C-1205 deg.C of the cycle mean, the comparison result value of the cycle mean is 1. Since the actual value of the cycle temperature difference, 49.2 deg.C, is within the threshold value of the cycle temperature difference, 45 deg.C-55 deg.C, the comparison result value of the cycle temperature difference is 1. Since the actual value 1202 ℃ of the cycle median is within the threshold 1185 ℃ to 1215 ℃ of the cycle median, the comparison result value of the cycle median is 1. Since the actual value of the period deviation, 0.55 deg.c, is within the threshold value of the period deviation, 0 deg.c-2 deg.c, the comparison result value of the period deviation is 1.
And fourthly, obtaining a temperature monitoring result. The comparison result values of the five temperature parameters are summed. When the total value is 5, the output is "normal" and no data is displayed, and the total value of the comparison result values of the five temperature parameters in the example of table 1 is 5. When the total value is 4-3, "fluctuation" is outputted and the actual value of the temperature parameter and the threshold value of which the comparison result value is 0 are displayed. When the total value is 2-1, "abnormal" is outputted and the actual value of the temperature parameter whose comparison result value is 0 and the threshold value are displayed. When "abnormality" occurs continuously, for example, 3 to 5 times or when the total value is 0, "failure" is output and the actual values and threshold values of the five temperature parameters are displayed.
Actually, the temperature of the hot blast air of the blast furnace changes from high to low in a certain temperature period, and the temperature also changes from high to low in the next period, and the circulation is repeated. If the temperature monitoring result is found to be fluctuation, abnormity or failure, the reason is found in time, and if the reason of the system is found to be changed, such as the change of iron ore raw materials, the yield limitation, the yield increase, the failure of a hot blast stove and the like, the threshold value of the temperature parameter is required to be adjusted in time. For example, the actual value of the temperature cycle is decreased due to the change of the iron ore raw material, if the actual value is smaller than the original preset temperature cycle threshold, the operator searches the reason of fluctuation of the temperature cycle according to the output temperature monitoring result and the displayed actual value and threshold of the temperature cycle, then finds that the iron ore raw material is changed, resets the threshold of the temperature cycle at this time, and then monitors the blast furnace hot air temperature.
The whole operation process related to the blast furnace hot air temperature monitoring is as follows: opening a related interface of a blast furnace industrial control microcomputer, and setting or adjusting a reasonable preset threshold value according to the actual blast furnace production and process configuration conditions; operating a blast furnace hot air temperature monitoring method; and if the monitoring result is found to be fluctuation, timely searching the reason, and performing corresponding processing according to the reason type after the reason is searched. Factors are eliminated if there are accidental causes, and reasonable thresholds are fixed according to reality if there are systematic causes. If the monitoring result is found to be abnormal, the monitoring interface is closely concerned, for example, the original one-time check in 30 minutes is changed into one-time check in 5-10 minutes, the reason is searched as soon as possible, and corresponding operation adjustment is made. If the monitoring result is found to be 'failure', immediately searching the reason and making corresponding operation adjustment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A blast furnace hot air temperature monitoring method is characterized by comprising the following steps:
acquiring the actual blast furnace hot air temperature at a preset frequency to obtain a preset number of acquisition points;
obtaining actual values of various temperature parameters according to the actual blast furnace hot air temperatures collected at the preset number of collection points, wherein the various temperature parameters comprise a temperature period, a period temperature difference, a period mean value, a period median and a period deviation;
comparing the obtained actual values of the various temperature references with corresponding preset threshold values to obtain comparison result values, if the actual values are within the corresponding preset threshold values, obtaining first comparison result values representing corresponding comparison results, and if not, obtaining second comparison result values representing corresponding comparison results;
comprehensively judging the obtained comparison result values of all temperature parameters to obtain a blast furnace hot air temperature monitoring result;
obtaining actual values for each temperature parameter further comprises: temperature cycle = interval time of adjacent collection points with large temperature rise, cycle temperature difference = highest temperature in temperature cycle-lowest temperature in temperature cycle, cycle mean = average of all collection temperatures in temperature cycle, cycle median = median of all collection temperature values in temperature cycle, and cycle deviation = absolute value of difference of cycle mean and cycle median;
the comprehensive judgment of the obtained comparison result values of the temperature parameters further comprises the following steps: summing the obtained comparison result values of the temperature parameters, and obtaining a blast furnace hot air temperature monitoring result according to the numerical range of the summed value;
the first comparison result value is 1, and the second comparison result value is 0;
and when the total value is 5, the blast furnace hot air temperature monitoring result is normal and does not display data, when the total value is 4-3, the blast furnace hot air temperature monitoring result is fluctuated and displays the actual value and the preset threshold value of the temperature parameter with the comparison result value of 0, when the total value is 2-1, the blast furnace hot air temperature monitoring result is abnormal and displays the actual value and the threshold value of the temperature parameter with the comparison result value of 0, and when the total value is 0, the blast furnace hot air temperature monitoring result is a fault and displays the actual value and the preset threshold value of each temperature parameter.
2. The blast furnace hot air temperature monitoring method according to claim 1, wherein obtaining a predetermined number of collection points further comprises: and outputting a corresponding relation curve of the temperature collected at each collection point and the collection time.
3. The blast furnace hot air temperature monitoring method according to claim 1, wherein the blast furnace hot air temperature monitoring result includes normal, and further includes at least one of the following types: fluctuations, anomalies, and failures.
4. The blast furnace hot air temperature monitoring method according to claim 3, further comprising the steps of: if the blast furnace hot air temperature monitoring result is normal, monitoring the temperature again according to the current preset threshold value; and if the blast furnace hot air temperature monitoring result is of the other types, searching the reason, and then performing corresponding operation adjustment according to the reason type.
5. The utility model provides a blast furnace hot-blast wind temperature monitoring device which characterized in that includes:
the temperature sensor is used for measuring the temperature of the blast furnace hot air;
the temperature acquisition unit is used for controlling the temperature sensor to acquire the actual blast furnace hot air temperature at a preset frequency to obtain a preset number of acquisition points;
the parameter calculation unit is used for obtaining actual values of various temperature parameters according to the actual blast furnace hot air temperatures acquired at the acquisition points with the preset number, wherein the various temperature parameters comprise a temperature period, a period temperature difference, a period mean value, a period median and a period deviation;
the threshold comparison unit is used for comparing the obtained actual values of the various temperature parameters with corresponding preset thresholds respectively to obtain comparison result values, if the actual values are within the corresponding preset thresholds, a first comparison result value representing a corresponding comparison result is obtained, and if the actual values are not within the corresponding preset thresholds, a second comparison result value representing the corresponding comparison result is obtained;
the comprehensive judgment unit is used for comprehensively judging the obtained comparison result values of the temperature parameters to obtain a blast furnace hot air temperature monitoring result;
the parameter calculation unit is further used for calculating the actual values of the temperature parameters by the following formula: the temperature cycle = the interval time of adjacent acquisition points with large temperature rise, wherein the large temperature rise is that the temperature difference between the front and the back of the adjacent acquisition points is more than or equal to 10 ℃; the temperature difference in the cycle = the highest temperature in the cycle-the lowest temperature in the cycle; the cycle mean = the average of all collected temperature values in the cycle; the median of the period = the median of all the collected temperature values in the period; cycle deviation = absolute value of difference of the cycle mean and the cycle median;
the comprehensive judgment unit is further used for summing the obtained comparison result values of the temperature parameters and obtaining a blast furnace hot air temperature monitoring result according to the numerical range of the summed value; assuming that the first comparison result value is 1, the second comparison result value is 0, the blast furnace hot air temperature monitoring result is normal and does not display data when the total value is 5, the blast furnace hot air temperature monitoring result is fluctuated and displays the actual value and the preset threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 4-3, the blast furnace hot air temperature monitoring result is abnormal and displays the actual value and the threshold value of the temperature parameter of which the comparison result value is 0 when the total value is 2-1, and the blast furnace hot air temperature monitoring result is failed and displays the actual value and the preset threshold value of each temperature parameter when the total value is 0 or the predetermined number of continuous abnormalities are provided.
6. The blast furnace hot-blast air temperature monitoring device according to claim 5, wherein the temperature sensor is connected with an industrial control microcomputer of the blast furnace through a PLC interface, and the temperature acquisition unit, the parameter calculation unit, the threshold comparison unit and the comprehensive judgment unit are positioned on the industrial control microcomputer.
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