CN117051190A - System and method for monitoring slag iron storage quantity of blast furnace hearth - Google Patents
System and method for monitoring slag iron storage quantity of blast furnace hearth Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 377
- 239000002893 slag Substances 0.000 title claims abstract description 195
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 184
- 238000003860 storage Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000010079 rubber tapping Methods 0.000 claims abstract description 72
- 239000002994 raw material Substances 0.000 claims abstract description 42
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 16
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 41
- 239000007788 liquid Substances 0.000 claims description 21
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical compound [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 239000000571 coke Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 230000003578 releasing effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000003628 erosive effect Effects 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000013079 data visualisation Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention discloses a system and a method for monitoring slag iron storage quantity of a blast furnace hearth. The method includes determining chemical components in the feedstock; making a distribution system in the blast furnace feeding process, and recording the action time and the batch weight of each time of the stock rod; determining tapping speed and tapping weight related data; determining related data of slag discharging speed and slag discharging weight; carrying out chemical detection on molten iron and slag; screening the data fed back by the raw material system and the slag iron system; and carrying out grading early warning on the data in the processing system, giving early warning to foreground operators, and giving a pre-furnace operation signal and a raw material early warning signal. The invention calculates the theoretical pig iron amount and the theoretical slag generation amount of the blast furnace; and early warning is carried out on the blast furnace raw material system and the slag iron system. The invention can effectively reflect the slag iron storage quantity of the hearth and has important significance for guiding stokehole operation.
Description
Technical Field
The invention relates to a system and a method for monitoring slag iron storage quantity of a blast furnace hearth, belonging to the technical field of iron making.
Background
The blast furnace essentially serves as a huge countercurrent heat exchanger and a chemical reactor, iron ore, coke and solvent added into the upper part of the blast furnace are used as raw materials, a series of reactions are carried out at a hot air port at the lower part to generate slag iron, the generated slag iron is converged to a hearth along a coke gap from a dripping zone for short-term storage, and the slag iron is discharged out of the blast furnace through a periodical iron opening. Under ideal conditions, the generation and collection speed of the blast furnace smelting slag iron is the same as the discharge speed of the slag iron at the iron outlet, so that the liquid level of the slag iron in the hearth of the blast furnace is relatively stable, the residence time of the slag iron in the hearth can be reduced, and the chemical erosion and thermal shock effects of the slag iron on hearth refractory materials and linings are effectively relieved. However, in the actual production process, under severe working environments such as high temperature and pressure in the hearth, real-time measurement of the slag-iron liquid level in the hearth is difficult to realize, and on the premise of lacking reliable safety basis, the control of key working procedure moments such as tapping, iron blocking and the like is often judged according to the front experience of operators. In the influence of serial factors such as slag iron fluidity, stokehole equipment and raw materials, the subjective consciousness of operators is judged and is likely to lead to the wide fluctuation of slag iron liquid level in the blast furnace, and then lead to the series problems such as wind hold-down in the furnace and burn out wind gap, difficult maintenance of a tap hole, aggravation of erosion of the inner wall of a hearth and the like, and especially, the influence on the large-scale and oversized blast furnace in the later stage of the furnace service is more remarkable.
The patent 201721538768.X is a slag iron liquid level monitoring device in a blast furnace hearth, which is installed in the blast furnace hearth by adopting a channel steel bracket, a plurality of armoured thermocouples are respectively arranged at different heights of the channel steel bracket, a temperature measuring head of each armoured thermocouple faces downwards, and a display instrument is connected with each armoured thermocouple through a thermocouple junction box and a compensating wire and is used for displaying the temperature in the blast furnace hearth in real time. The monitoring equipment is arranged in the blast furnace hearth, the monitoring equipment is required to be arranged before stopping production and opening the furnace, and the equipment in the hearth is in high-temperature molten iron with pressure for a long time and is extruded by the furnace burden at the upper part, so that the equipment is easy to damage and lose efficacy and is difficult to maintain and replace.
The device and the method for estimating the blast furnace tapping amount of the patent 201610088993.1 comprise a correlation determining module and a calculating module. The correlation determination module comprises a liquid level unit and a determination unit, wherein the liquid level unit reads the liquid level of the blast furnace side, the determination unit reads the determination amount of each ladle of molten iron of the steelmaking side, and the correlation determination module calculates the corresponding relation between the liquid level of the molten iron and the determination amount of the molten iron according to the data of the liquid level unit and the determination unit. The calculation module includes a tapping amount estimation unit and a tapping amount correction unit. The tapping unit reads the actual liquid level in the iron mixing vehicle, and substitutes the actual liquid level into the corresponding relation between the liquid level of the molten iron and the determined amount of the molten iron to obtain the actual determined amount of the molten iron in the iron mixing vehicle. The tapping amount correction unit corrects the correspondence relationship between the molten iron level height and the molten iron determination amount according to the actual molten iron determination amount. The patent does not give a calculation method of key parameters such as theoretical pig iron amount, theoretical slag generation amount and the like, and ignores the effect of slag in the blast furnace smelting process, and iron in the blast furnace raw material not only enters molten iron, but also enters part of slag, so that the calculation method of the patent is difficult to reflect actual conditions.
The 201610880421.7 method and device for online measuring the slag and iron liquid level information of a blast furnace hearth uses high-precision electromotive force signals generated by electromotive force measuring points as measuring parameters, and a computer system performs program code analysis on data of different air ports and different iron outlets to obtain the liquid level and dead column information of the hearth. The measurement is based on the change of heat transfer between the refractory material and the furnace shell of the hearth caused by different heat storage capacities of the slag iron, and the measured value is the heat transferred by the refractory material and the furnace shell. The computer system responsible for code processing is used as a data visualization system, and the interior of the electromotive force measuring points consists of resistors, measuring probes and circuits, so that electromotive force generated by each electromotive force measuring point is directly analyzed and calculated. The patent does not consider the deviation of electromotive force caused by uneven change of the hearth due to erosion of the hearth. With the production of blast furnaces, irregular erosion deformation, such as 'foot shape', occurs in the hearth, and the phenomenon is more remarkable particularly in the later stage of the furnace, so that the actual feedback of the change condition of the hearth liquid level is difficult by adopting an electromotive force signal.
In the production of the blast furnace at the present stage, the measurement and visualization of the hearth slag iron liquid level are still blank in China, and although research and application in this aspect exist abroad, the measurement and visualization of the hearth slag iron liquid level is still only remained on the initial research and development and the reading and decoding of abnormal signals, and particularly under the high-temperature iron water environment with pressure in the hearth, the existing hearth liquid level detection equipment is difficult to play a role. At present, the control of key working procedure moments such as a tap hole and a tap hole of a blast furnace is often judged according to the experience in front of the furnace by a blast furnace operator, if the tap hole is opened too late, a large amount of slag irons are easy to stay in a hearth to restrict the blast furnace air supply production process, if the tap hole is opened too early, the temperature of the slag irons is easy to be low, the flow rate is low, so that a slag iron ditch is silted and blocked, and the production organization outside the furnace is influenced. The operation time in front of the furnace can be reasonably determined according to the storage amount of slag iron in the hearth, and the method has important significance for safe and stable production of the blast furnace. .
Disclosure of Invention
In order to solve the problems, the invention discloses a monitoring system and a method for slag iron storage quantity of a blast furnace hearth, which are used for determining the slag iron storage quantity in the hearth according to a blast furnace material balance relation, guiding a blast furnace operator to reasonably determine key occasions such as a tapping hole, a iron blocking hole and the like, effectively solving the problems of forced wind reduction, long-time waiting for packaging and the like of the blast furnace caused by untimely tapping, and having important significance for safe and smooth operation and efficient production of the blast furnace, and the specific technical scheme is as follows:
a monitoring system for slag iron storage quantity of a blast furnace hearth comprises a raw material system (Z1), a slag iron system (Z2), a processing system (Z3) and an early warning system (Z4);
the raw material system (Z1) is used for feeding the blast furnace according to a material distribution system in the blast furnace feeding process; the method comprises the steps that a stock rod is arranged in a blast furnace, a lifting motion is carried out before the blast furnace is used for distributing materials, a discharging motion is carried out after the material distribution is completed, and the time and the batch weight of each motion of the stock rod are recorded;
the slag iron system (Z2) comprises an iron tapping system and a slag tapping system, wherein the iron tapping system is used for determining relevant data of iron tapping speed and iron tapping weight, and the slag tapping system is used for determining relevant data of slag tapping speed and slag tapping weight;
the processing system (Z3) is used for screening the data fed back by the raw material system (Z1) and the iron slag system (Z2);
the early warning system (Z4) is used for carrying out grading early warning on related data of tapping speed, slag discharging speed, pig iron speed, slag generating speed, molten iron storage quantity and slag iron storage quantity in the processing system (Z3), giving early warning to foreground operators, and giving a stokehold operation signal and a raw material early warning signal.
Further, the system also comprises a material detection system for detecting the raw material components in the raw material system (Z1) and the molten iron and slag components in the slag iron system (Z2).
A method for monitoring the slag iron storage quantity of a blast furnace hearth comprises the following steps:
step 1: carrying out chemical detection on materials in a raw material system (Z1) to determine chemical components in the raw materials;
step 2: setting a distribution system in the feeding process of the blast furnace, arranging a stock rod in the blast furnace, carrying out a rod lifting action before the blast furnace distributes materials, carrying out a rod discharging action after the materials are distributed, and recording the time of each action of the stock rod and the batch weight of the materials;
step 3: weighing the ladle, the hot metal ladle and the hot metal ladle car, and determining relevant data of tapping speed and tapping weight;
step 4: determining related data of slag discharging speed and slag discharging weight;
step 5: carrying out chemical detection on molten iron and slag;
step 6: screening the data fed back by the raw material system (Z1) and the iron slag system (Z2);
step 7: and carrying out grading early warning on related data of tapping speed, slag discharging speed, pig iron speed, slag generating speed, molten iron storage quantity and slag iron storage quantity in the processing system (Z3), giving early warning to foreground operation staff, and giving pre-tapping operation signals and raw material early warning signals.
Further, the materials in the step 1 include ore, coke and other related materials.
Further, the chemical components in the step 1 comprise iron and CaO in the raw materials.
Further, the distribution system in the step 2 may be a distribution system of "coke-ore-coke-ore".
Further, in the step 3, the ladle and the ladle car are weighed by an electronic scale.
Further, in the step 4, related data of the slag tapping speed and the slag tapping weight are determined through a dehydration drum of the slag and a transmission system.
Further, in the step 5, iron element in molten iron is detected, and iron element and CaO in slag are detected.
Further, the step 6 specifically includes: calculating theoretical pig iron speed and theoretical slag generation speed of each slide rod under the actions of lifting and releasing the slide rod:
wherein: v (v) Raw slag, x# -A -x# -a theoretical slag generation speed;
the total amount of CaO in the material;
t x#-A -a time corresponding to x# -A;
ω slag, caO -the CaO content of the slag at the present time;
slag quantity;
the tapping speed and the tapping speed are transmitted to a processing system (Z3) in real time through a tapping system and a tapping system in a slag iron system (Z2), integration is carried out according to the difference value between the slag iron generating speed and the slag iron discharging speed, the slag iron storage quantity in a hearth is calculated,
molten iron storage amount:slag iron storage amount:
wherein: p is p Iron (Fe) -molten iron density;
p slag of -slag density;
in order to ensure the accuracy of the slag iron storage quantity in the hearth in the calculation process, the time t-1 is the time when the slag iron liquid level in the hearth reaches the tapping hole position after tapping is completed.
Further, the stokehold operation signal and the raw material early warning signal in the step 7 include:
early warning value one: the slag iron storage amount is lower than a% of the hearth volume of the blast furnace, the slag iron generation speed is lower than the slag iron discharge speed, the system gives an automatic alarm and gives a stokehole operation signal, at the moment, the stokehole must be plugged, and an operation signal that only one iron hole is reserved for plugging one iron hole can be given for large and extra-large blast furnaces;
and the early warning value II: the slag iron storage amount is lower than b percent and higher than a percent of the hearth volume of the blast furnace, a system gives a prompt to a foreground operator and gives a stokehole operation signal, and the stokehole should have operation conditions for plugging the taphole at any time;
and (3) early warning value III: the slag iron storage amount exceeds c% of the hearth volume of the blast furnace and is not higher than d%, a system gives a prompt to a foreground operator and gives a stokehole operation signal, and the stokehole should have tapping operation conditions at any time;
and the early warning value is four: the slag iron storage amount exceeds d% of the hearth volume of the blast furnace, the system gives an automatic alarm and gives a stokehole operation signal, the stokehole must be tapped at the moment, and an operation signal for opening another tap hole can be given for large and extra-large blast furnaces;
early warning value five: the iron slag storage quantity exceeds d% of the hearth volume of the blast furnace, the iron slag generation speed is higher than the iron slag discharge speed, the system gives an automatic alarm, a stokehole operation signal is given, the stokehole operation signal is needed to be discharged, an operation signal for opening another iron notch can be given for a large-scale and extra-large-scale blast furnace, and a raw material early warning signal is given, so that the material speed, the blast furnace air quantity and the oxygen quantity are required to be controlled;
when the blast furnaces are 2500-level blast furnaces and 3000-level blast furnaces, a is 0.5, b is 0.8, c is 1.5, d is 2,
when the blast furnace is 5800 grade blast furnace, a is 0.4, b is 0.6, c is 1.2, d is 1.6.
The beneficial effects of the invention are as follows:
(1) The invention determines the slag iron generation speed in the hearth according to the blast furnace distribution speed, can effectively monitor the working condition of the hearth, determines the slag iron storage condition in the hearth, and has important reference significance for guiding blast furnace operators to operate the blast furnace.
(2) The invention combines slag iron generation and discharge together, can effectively guide operators to react in advance to perform stokehole operation, accurately determine key operation opportunities of stokeholes, iron blockage and the like, and avoid blast furnace operation deviation caused by subjective intention judgment of blast furnace operators.
(3) The invention can grasp the storage quantity of slag iron in the hearth in real time, and can effectively avoid the air-holding in the furnace caused by untimely tapping of iron, thereby forcing the blast furnace to reduce the air and oxygen to influence the safe and smooth operation of the blast furnace.
(4) The invention can grasp the storage quantity of slag iron in the hearth in real time, can effectively guide the dispatch of the molten iron transport vehicle, can timely dispatch the molten iron vehicle in advance before tapping operation, and effectively reduces the phenomenon of waiting for ladle in the tapping process.
(5) The invention can grasp the storage quantity of the slag iron in the hearth in real time, reduces the storage time of the slag iron in the hearth, effectively relieves the chemical erosion and thermal shock effect of the slag iron on hearth refractory materials and linings, and has important significance for guiding the safe production of the blast furnace especially under the conditions of higher temperature and thinner inner wall of the hearth in the later stage of the furnace.
Drawings
FIG. 1 is a schematic diagram of a computational model in the present invention.
FIG. 2 is a schematic diagram of the motion signal of the inner trial rod of the blast furnace according to the present invention.
Detailed Description
The invention is further elucidated below in connection with the drawings and the detailed description. It should be understood that the following detailed description is merely illustrative of the invention and is not intended to limit the scope of the invention.
As can be seen by referring to FIG. 1, the invention mainly comprises a raw material system Z1, a slag iron system Z2, a treatment system Z3 and an early warning system Z4.
The feed system Z1 mainly comprises ore, coke and other related materials.
And carrying out chemical detection on the materials in the raw material system Z1 to determine the chemical components in the raw materials. In particular to the detection of iron element and CaO in the raw materials.
The material distribution system of 'coke-ore-coke-ore' is often adopted in the blast furnace material loading process, a stock rod is arranged in the blast furnace, the stock rod is often subjected to the rod lifting action before the blast furnace material distribution, the rod discharging action is performed after the material distribution is finished, and the time and the batch weight of each action of the stock rod are recorded.
The slag iron system Z2 mainly comprises a tapping system and a slag discharging system.
The ladle, the hot metal ladle and the hot metal ladle car are weighed by the electronic scale, so that relevant data such as tapping speed, tapping weight and the like can be determined.
The related data such as slag tapping speed, slag tapping weight and the like can be determined through the dewatering drum of slag, a transmission system and the like.
Chemical detection of molten iron and slag is also required. In particular to the detection of iron element in molten iron, and the detection of iron element and CaO in slag.
The processing system Z3 mainly performs screening processing on the data fed back by the raw material system Z1 and the slag iron system Z2.
From the balance of the materials in the blast furnace, the amount of iron carried in all the materials for the blast furnace should be equal to the sum of the amount of iron in the smelting pig iron and the amount of iron in the slag, and the amount of CaO carried in all the materials for the blast furnace should be equal to the sum of CaO in the slag. Fig. 2 shows a stock rod data signal, wherein a is a stock rod releasing action after cloth is completed, B is a stock rod lifting action before cloth is completed, and a slow down curve between a and B is a stock rod descending action curve along with a material surface. In FIG. 2, 1#, 3#, 5#, 7#, 9#, 11# are cokes, 2#, 4#, 6#, 8#, 10#, 12# are ores.
From the balance of the materials in the blast furnace, the amount of iron carried in all the materials for the blast furnace should be equal to the sum of the amount of iron in the smelting pig iron and the amount of iron in the slag, and the amount of CaO carried in all the materials for the blast furnace is equal to the amount of CaO in the slag.
Calculating theoretical pig iron speed and theoretical slag generation speed of each slide rod under the actions of lifting and releasing the slide rod:
wherein: v (v) Raw slag, x# -A -x# -a theoretical slag generation speed;
the total amount of CaO in the material;
t x#-A -a time corresponding to x# -A;
ω slag, caO -the CaO content of the slag at the present time;
slag quantity;
for example:
the tapping speed and the tapping speed are transmitted to the processing system Z3 in real time through the tapping system and the tapping system in the tapping system Z2. And integrating according to the difference value of the slag iron generation speed and the slag iron discharge speed, so as to calculate the slag iron storage quantity in the hearth.
Molten iron storage amount:
slag iron storage amount:
wherein: p is p Iron (Fe) -molten iron density;
p slag of -slag density;
note that: in order to ensure the accuracy of the slag iron storage quantity in the hearth in the calculation process, the time t-1 is the time when the slag iron liquid level in the hearth reaches the tapping hole position after tapping is completed.
The early warning system Z4 mainly carries out grading early warning on related data of tapping speed, slag discharging speed, pig iron speed, slag generating speed, molten iron storage quantity and slag iron storage quantity in the processing system Z3, gives early warning to foreground operation staff, and gives a pre-furnace operation signal and a raw material early warning signal.
Early warning value one: the slag iron storage amount is lower than a% of the hearth volume of the blast furnace, the slag iron generation speed is lower than the slag iron discharge speed, the system gives an automatic alarm and gives a stokehole operation signal, at the moment, the stokehole must be plugged, and an operation signal that only one iron hole is reserved for plugging one iron hole can be given for large and extra-large blast furnaces;
and the early warning value II: the slag iron storage amount is lower than b percent and higher than a percent of the hearth volume of the blast furnace, a system gives a prompt to a foreground operator and gives a stokehole operation signal, and the stokehole should have operation conditions for plugging the taphole at any time;
and (3) early warning value III: the slag iron storage amount exceeds c% of the hearth volume of the blast furnace and is not higher than d%, a system gives a prompt to a foreground operator and gives a stokehole operation signal, and the stokehole should have tapping operation conditions at any time;
and the early warning value is four: the slag iron storage amount exceeds d% of the hearth volume of the blast furnace, the system gives an automatic alarm and gives a stokehole operation signal, the stokehole must be tapped at the moment, and an operation signal for opening another tap hole can be given for large and extra-large blast furnaces;
early warning value five: the iron slag storage quantity exceeds d% of the hearth volume of the blast furnace, the iron slag generation speed is higher than the iron slag discharge speed, the system gives an automatic alarm, a stokehole operation signal is given, the stokehole operation signal is needed to be discharged, an operation signal for opening another iron notch can be given for a large-scale and extra-large-scale blast furnace, and a raw material early warning signal is given, so that the material speed, the blast furnace air quantity and the oxygen quantity are required to be controlled;
when the blast furnaces are 2500-level blast furnaces and 3000-level blast furnaces, a is 0.5, b is 0.8, c is 1.5, d is 2,
when the blast furnace is 5800 grade blast furnace, a is 0.4, b is 0.6, c is 1.2, d is 1.6.
a. b, c and d, and in the actual working condition, the furnace condition and the size of the blast furnace can be combined to define specific definition.
According to the invention, a raw material system and a slag iron system are corresponding according to a blast furnace material balance relation, and the raw material system takes a stock rod action signal in the blast furnace as a reference to calculate the theoretical pig iron amount and the theoretical slag generation amount of the blast furnace; the slag iron system adopts methods of molten iron weighing, dewatering drum and the like to determine slag speed and tapping speed. The feedback data are analyzed and calculated through the processing system, the slag iron storage quantity in the hearth is determined, and the blast furnace raw material system and the slag iron system are pre-warned. The invention can effectively reflect the slag iron storage quantity of the hearth and has important significance for guiding stokehole operation.
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the technical means, and also comprises the technical scheme formed by any combination of the technical features.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (11)
1. The monitoring system for the slag iron storage quantity of the blast furnace hearth is characterized by comprising a raw material system (Z1), a slag iron system (Z2), a processing system (Z3) and an early warning system (Z4);
the raw material system (Z1) is used for feeding the blast furnace according to a material distribution system in the blast furnace feeding process; the method comprises the steps that a stock rod is arranged in a blast furnace, a lifting motion is carried out before the blast furnace is used for distributing materials, a discharging motion is carried out after the material distribution is completed, and the time and the batch weight of each motion of the stock rod are recorded;
the slag iron system (Z2) comprises an iron tapping system and a slag tapping system, wherein the iron tapping system is used for determining relevant data of iron tapping speed and iron tapping weight, and the slag tapping system is used for determining relevant data of slag tapping speed and slag tapping weight;
the processing system (Z3) is used for screening the data fed back by the raw material system (Z1) and the iron slag system (Z2);
the early warning system (Z4) is used for carrying out grading early warning on related data of tapping speed, slag discharging speed, pig iron speed, slag generating speed, molten iron storage quantity and slag iron storage quantity in the processing system (Z3), giving early warning to foreground operators, and giving a stokehold operation signal and a raw material early warning signal.
2. The blast furnace hearth iron storage monitoring system according to claim 1, further comprising a material detection system for detecting a raw material component in the raw material system (Z1) and a molten iron and slag component in the iron slag system (Z2).
3. The method for monitoring the slag iron storage quantity of the blast furnace hearth is characterized by comprising the following steps of:
step 1: carrying out chemical detection on materials in a raw material system (Z1) to determine chemical components in the raw materials;
step 2: setting a distribution system in the feeding process of the blast furnace, arranging a stock rod in the blast furnace, carrying out a rod lifting action before the blast furnace distributes materials, carrying out a rod discharging action after the materials are distributed, and recording the time of each action of the stock rod and the batch weight of the materials;
step 3: weighing the ladle, the hot metal ladle and the hot metal ladle car, and determining relevant data of tapping speed and tapping weight;
step 4: determining related data of slag discharging speed and slag discharging weight;
step 5: carrying out chemical detection on molten iron and slag;
step 6: screening the data fed back by the raw material system (Z1) and the iron slag system (Z2);
step 7: and carrying out grading early warning on related data of tapping speed, slag discharging speed, pig iron speed, slag generating speed, molten iron storage quantity and slag iron storage quantity in the processing system (Z3), giving early warning to foreground operation staff, and giving pre-tapping operation signals and raw material early warning signals.
4. A method for monitoring the amount of iron slag stored in a blast furnace hearth according to claim 3, wherein the material in step 1 comprises ore, coke and other related materials.
5. A method for monitoring the iron slag storage capacity of a blast furnace hearth according to claim 3, wherein the chemical components in the step 1 include iron and CaO in the raw materials.
6. The method for monitoring the iron slag storage capacity of the blast furnace hearth according to claim 3, wherein the distribution system in the step 2 is selected from the group consisting of coke-ore-coke-ore.
7. The method for monitoring the slag and iron storage capacity of the blast furnace hearth according to claim 3, wherein the step 3 is characterized in that the ladle, the ladle and the ladle car are weighed by an electronic scale.
8. A method for monitoring the iron slag storage capacity of a blast furnace hearth according to claim 3, wherein in the step 4, the related data of the slag tapping speed and the slag tapping weight are determined through a dehydration drum of the slag and a transmission system.
9. The method for monitoring the iron storage amount of the blast furnace hearth slag in accordance with claim 3, wherein in the step 5, iron element in the molten iron and iron element and CaO in the slag are detected.
10. The method for monitoring the slag iron storage capacity of the blast furnace hearth according to claim 3, wherein the step 6 is specifically: calculating theoretical pig iron speed and theoretical slag generation speed of each slide rod under the actions of lifting and releasing the slide rod:
wherein: v (v) Raw slag, x# -A -x# -a theoretical slag generation speed;
the total amount of CaO in the material;
t x#-A -a time corresponding to x# -A;
ω slag, caO -the CaO content of the slag at the present time;
slag quantity;
the tapping speed and the tapping speed are transmitted to a processing system (Z3) in real time through a tapping system and a tapping system in a slag iron system (Z2), integration is carried out according to the difference value between the slag iron generating speed and the slag iron discharging speed, the slag iron storage quantity in a hearth is calculated,
molten iron storage amount:
slag iron storage amount:
wherein: p is p Iron (Fe) -molten iron density;
p slag of -slag density;
in order to ensure the accuracy of the slag iron storage quantity in the hearth in the calculation process, the time t-1 is the time when the slag iron liquid level in the hearth reaches the tapping hole position after tapping is completed.
11. The method for monitoring the slag iron storage amount of the blast furnace hearth according to claim 3, wherein the stokehold operation signal and the raw material early warning signal in the step 7 include:
early warning value one: the slag iron storage amount is lower than a% of the hearth volume of the blast furnace, the slag iron generation speed is lower than the slag iron discharge speed, the system gives an automatic alarm and gives a stokehole operation signal, at the moment, the stokehole must be plugged, and an operation signal that only one iron hole is reserved for plugging one iron hole can be given for large and extra-large blast furnaces;
and the early warning value II: the slag iron storage amount is lower than b percent and higher than a percent of the hearth volume of the blast furnace, a system gives a prompt to a foreground operator and gives a stokehole operation signal, and the stokehole should have operation conditions for plugging the taphole at any time;
and (3) early warning value III: the slag iron storage amount exceeds c% of the hearth volume of the blast furnace and is not higher than d%, a system gives a prompt to a foreground operator and gives a stokehole operation signal, and the stokehole should have tapping operation conditions at any time;
and the early warning value is four: the slag iron storage amount exceeds d% of the hearth volume of the blast furnace, the system gives an automatic alarm and gives a stokehole operation signal, the stokehole must be tapped at the moment, and an operation signal for opening another tap hole can be given for large and extra-large blast furnaces;
early warning value five: the iron slag storage quantity exceeds d% of the hearth volume of the blast furnace, the iron slag generation speed is higher than the iron slag discharge speed, the system gives an automatic alarm, a stokehole operation signal is given, the stokehole operation signal is needed to be discharged, an operation signal for opening another iron notch can be given for a large-scale and extra-large-scale blast furnace, and a raw material early warning signal is given, so that the material speed, the blast furnace air quantity and the oxygen quantity are required to be controlled;
when the blast furnaces are 2500-level blast furnaces and 3000-level blast furnaces, a is 0.5, b is 0.8, c is 1.5, d is 2,
when the blast furnace is 5800 grade blast furnace, a is 0.4, b is 0.6, c is 1.2, d is 1.6.
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