CN113897473B - Control device and method for alloy adding speed of electric furnace EBT steel tapping feeding pipe - Google Patents
Control device and method for alloy adding speed of electric furnace EBT steel tapping feeding pipe Download PDFInfo
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- CN113897473B CN113897473B CN202110959476.8A CN202110959476A CN113897473B CN 113897473 B CN113897473 B CN 113897473B CN 202110959476 A CN202110959476 A CN 202110959476A CN 113897473 B CN113897473 B CN 113897473B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a device and a method for controlling alloy adding speed of an electric furnace EBT steel tapping feeding pipe, belonging to the technical field of electric furnace production. The device comprises a horizontal bracket, wherein one end of the horizontal bracket is hinged with a supporting frame; a feeding pipe is arranged above the supporting frame in parallel and is fixedly connected with the supporting frame; the angle instrument is arranged between the support frame and the horizontal support and is fixedly connected with the support frame, and the angle instrument is used for detecting an included angle between the support frame and the horizontal support and further detecting an included angle between the feeding pipe and a horizontal plane. The angle gauge is characterized in that a plurality of fixing teeth are arranged on the circumference of the angle gauge and are uniformly arranged at intervals, and a rack which is vertically arranged is arranged on the horizontal support and is meshed with the fixing teeth. According to the method, the required speed of the alloy in the feeding pipe is calculated according to the service life of the EBT steel tapping hole and the amount of the alloy to be added, the included angle between the feeding pipe and the horizontal plane is adjusted in advance, the alloying process is ensured to be in the best opportunity, and the expected production requirement is met.
Description
Technical Field
The invention relates to a device and a method for controlling alloy adding speed of an electric furnace EBT steel tapping feeding pipe, belonging to the technical field of electric furnace production.
Background
At present, in the EBT tapping process of the electric furnace, the molten steel is continuously added with alloy through a charging pipe to carry out the primary alloying process. In the alloying process of the EBT tapping of the electric furnace, if the alloy adding speed is too fast and the time is too early, the heat provided by the electric furnace is insufficient to melt the alloy due to too little molten steel, cold steel is generated at the bottom of a ladle, and the subsequent production is influenced; if the alloy adding speed is too slow and the time is too late, the phenomenon that the alloy is not added after tapping is finished can occur, and the molten steel components can not meet the technological requirements. In order to avoid the phenomenon, the moment of alloying the EBT steel tapping of the electric furnace is best from one third of the steel tapping amount to two thirds of the steel tapping amount. In the EBT tapping process of the existing electric furnace, alloy enters molten steel after the alloy forms a certain angle with the horizontal plane through a charging pipe and the alloy obtains the speed from a static state by utilizing gravity. However, the tapping time of the electric furnace EBT is short, only lasts for tens of seconds to more than one hundred seconds, and the tapping time changes due to the increase of the using times of the tapping hole of the electric furnace EBT, and the tapping time is about 40 percent different from that in the early use stage and the later use stage of the EBT; for commonly used structural alloy steels, the alloy additions vary between 1% and 3% of the total molten steel. The variation in the time of the best tapping and the total amount of alloy addition often results in alloying that does not meet the production expectations.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for controlling the alloy adding speed of an electric furnace EBT steel tapping feeding pipe, which aim to solve the technical problem in the prior art.
The technical scheme adopted by the invention for solving the problems is as follows: a control device for alloy adding speed of an electric furnace EBT steel tapping feed pipe comprises a horizontal bracket, wherein one end of the horizontal bracket is hinged with a support frame; a feeding pipe is arranged above the supporting frame in parallel and is fixedly connected with the supporting frame; the angle instrument is arranged between the support frame and the horizontal support and is fixedly connected with the support frame, and the angle instrument is used for detecting an included angle between the support frame and the horizontal support and further detecting an included angle between the feeding pipe and a horizontal plane.
The angle gauge is characterized in that a plurality of fixed teeth are arranged on the circumference of the angle gauge and are uniformly arranged at intervals, and a rack which is vertically arranged is arranged on the horizontal support and is meshed with the fixed teeth.
The connecting side of the angle gauge and the support frame is provided with a 0-degree marking line, and the 0-degree marking line corresponds to the superposition position of the support frame and the horizontal support.
A method for controlling the alloy adding speed of an electric furnace EBT tapping feed pipe comprises the following steps:
step one, determining the addition W of the alloy A element A ：
According to the requirements of a smelting steel seed guide card on the content of the element A in molten steel after tapping is X1%, the content of the element A in the alloy is a%, the total amount of electric furnace tapping is W tons, and the weight of the element A to be added is W A ＝W×X1％÷a％；
Step two, predicting the time T required by tapping n ：
The tapping time of the first time of the use of the EBT tapping hole of the electric furnace is recorded as T Beginning of the design The tapping time of the steel is recorded as T when the steel is used for the last time before the EBT tapping hole is replaced, namely N Terminal Then use the time T of the nth time n ＝T First stage -N x (tbinit-tterminal)/N;
step three, obtaining the speed V required by adding alloy into molten steel A goes out ：
The average feeding speed required by the alloy is V A Initial velocity of alloy V A is first If the value is 0, the outlet speed of the alloy A element in the feeding pipe is V A ＝(V A is first +V A goes out ) /2, obtaining V A goes out ＝2V A ；
Step four, calculating an included angle alpha between the feeding pipe and the horizontal plane: according to the calculation formula: v A goes out 2 ＝L×g×(sinα-fa×cosα)/2，
Wherein: l is the length of the charging tube, g is the gravity acceleration, and the constant is 9.8; fa is the friction coefficient between the alloy A element and the charging pipe;
step five, determining an included angle alpha 'between the feeding pipe and the horizontal plane, and taking the whole after the alpha' is alpha +5 degrees;
and step six, rotating the support frame to enable an included angle between the support frame and the horizontal support frame to be alpha'.
The average feeding speed V in the third step A ＝W A /[(2/3T n -1/3T n )×S A ]Wherein S is A The unit weight of the element A in the feeding tube is shown.
Said S A ＝1/5×S Cutting block X V, wherein, S Cutting block ＝πr 2 R is the diameter of the feed tube and V is the weight of the element A in each cubic meter.
Compared with the prior art, the invention has the advantages that: the alloy adding speed control device and method for the EBT steel tapping feed pipe of the electric furnace calculate the required speed of the alloy in the feed pipe according to the service life of an EBT steel tapping hole and the amount of the alloy to be added, adjust the included angle between the feed pipe and the horizontal plane in advance, ensure the optimal time of the alloying process and meet the expected production requirements.
Drawings
FIG. 1 is a schematic diagram of a control device for alloy adding speed of an electric furnace EBT steel tapping feeding pipe according to an embodiment of the invention;
in the figure, a charging pipe 1, a foot rest 2, a supporting frame 3, a horizontal support 4, a hinge 5 and an angle instrument 6 are arranged.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the device for controlling the alloy adding speed of the electric furnace EBT tapping feed pipe in the embodiment includes a horizontal bracket 4, wherein one end of the horizontal bracket 4 is hinged to a support frame 3 through a hinge 5, so that one end of the support frame 3 can rotate around the hinge point, and further an included angle between the support frame 3 and the horizontal bracket 4 is adjusted. The parallel filling tube 1 that is equipped with in support frame 3 top, the symmetry is equipped with a plurality of foot rests 2 in filling tube 1 bottom for filling tube 1 is fixed in on support frame 3, when support frame 3 rotates, drives filling tube 1 and rotates in step. Be equipped with angle appearance 6 between support frame 3 and the horizontal stand 4, angle appearance 6 and support frame 3 fixed connection, and angle appearance 6 and support frame 3 connected side have 0 mark line, and 0 mark line is the support frame 3 and the corresponding of horizontal stand 4 coincidence. The angle meter 6 is used for detecting an included angle between the support frame 3 and the horizontal support 4, and further detecting an included angle between the feeding pipe 1 and a horizontal plane.
A plurality of fixed teeth are arranged on the circumference of the angle instrument 6, the fixed teeth are uniformly arranged at intervals, and an included angle between every two adjacent fixed teeth is 5 degrees. The horizontal bracket is provided with a vertically arranged rack, and the fixed teeth are meshed with the rack. When the supporting frame is rotated, the angle instrument and the feeding pipe are driven to synchronously rotate, and after the supporting frame is rotated in place, the supporting frame and the horizontal support keep a certain included angle through meshing of the fixed teeth on the angle instrument and the rack.
A method for controlling the alloy adding speed of an electric furnace EBT steel tapping feeding pipe comprises the following steps:
step one, determining the addition W of the alloy A element A ：
According to the requirements of a smelting steel seed guide card on the content of the element A in molten steel after tapping being X1%, the content of the element A in the alloy being a%, and the total tapping amount of the electric furnace being W tons, obtaining that the weight of the element A to be added is W A ＝W×X1％÷a％。
Step two, predicting the time T required by tapping n ：
The tapping time of the first time of the use of the EBT tapping hole of the electric furnace is recorded as T Beginning of the design The tapping time of the steel is recorded as T when the steel is used for the last time before the EBT tapping hole is replaced, namely N Terminal Then the nth time T is used n ＝T Beginning of the design -n×(T Beginning of the design -T Final (a Chinese character of 'gan') )/N。
Step three, obtaining the speed V required by adding alloy into molten steel A goes out ：
The average feeding speed required by the alloy is V A Initial velocity of alloy V A Initially 0, the outlet velocity of the alloy A element in the charging tube is V A ＝(V A is just +V A goes out ) /2, obtaining V A is out ＝2V A ；
Wherein the average feeding speed V A ＝W A /[(2/3T n -1/3T n )×S A ]，S A Is the unit weight of the element A in the feed tube, S A ＝1/5×S Cutting block ×V，S Section bar ＝πr 2 R is the diameter of the feeding tube and V is the sum of volume per cubic meterWeight of gold.
Step four, calculating an included angle alpha between the feeding pipe and the horizontal plane: according to the calculation formula: v A is out 2＝L×g×(sinα-fa×cosα)/2，
Wherein: l is the length of the charging tube, g is the gravity acceleration, and the constant is 9.8; fa is the friction coefficient between alloy A element and charging tube, and V calculated in step three A is out Substituting the formula into the formula to obtain the alpha value.
And step five, determining an included angle alpha 'between the feeding pipe and the horizontal plane, and rounding after alpha' is alpha plus 5 degrees.
And sixthly, rotating the support frame upwards, and observing the number of the fixed teeth rotated on the angle instrument to ensure that the included angle between the support frame and the horizontal support is alpha ', namely the included angle between the feeding pipe and the horizontal plane is alpha'.
Detailed description of the preferred embodiment
A method for controlling the alloy adding speed of an electric furnace EBT steel tapping feeding pipe comprises the following steps:
the method comprises the following steps: when the content of the element A required by smelting of steel before tapping of an electric furnace is 1.5 percent, the content of the element A in the iron alloy is 60 percent, and the total tapping amount is 100 tons, the weight of the alloy containing the element A needs to be added, namely 100 tons multiplied by 1.5 percent divided by 60 percent, and 2.5 tons;
step two: combining the service condition of the electric furnace, the time of tapping 100 tons of molten steel by the new EBT is 120 seconds, the service frequency of an EBT tapping hole of the electric furnace is inquired, if the EBT tapping hole is in the middle stage, the tapping time is 100 seconds, the optimal alloying time is 40 seconds to 70 seconds after tapping, namely 2.5 tons of alloy containing the A element is added within 30 seconds;
step three: assuming that the amount of alloy A element per cubic meter is 7 tons, the diameter of the feed tube is 0.3 meters, the height of the alloy A element in the feed tube is about one-quarter of the diameter, and the weight per unit of 1 meter is S A ＝1/5×S Cutting block X 7 ton/cubic meter to obtain S A Is 98 kg/m. V A The speed V required by adding alloy A element into molten steel is further obtained by that =2.5 ton/div (30 seconds multiplied by 98 kg/m) ≈ 0.85 m/s A goes out =1.7 m/s.
Step four:
calculating the feeding speed required by adding the alloy A element into the molten steel, and obtaining the included angle alpha between the feeding pipe and the horizontal plane according to the following calculation formula:
V a goes out 2 ＝L×g×(sinα-f a ×cosα)/2
Wherein: l is the length of the feed tube, known; g is gravity acceleration, and a constant is 9.8; f. of a The friction coefficient between the alloy A and the charging pipe is 0.2, the length of the charging hopper is 3.5 meters, and the alpha angle value is 20.7 degrees by substituting the formula.
Step five: the angle α' between the filling tube and the horizontal is determined to have a value of 25 °.
Step six: the support frame upwards rotates along the horizontal stand, turns to 25 of sign on the angle gauge, through fixed tooth and rack interlock, and then fixed support frame for it is fixed between support frame and the horizontal stand, and alloy A element in the feed pipe begins to add in the molten steel.
In the production process, the required speed of the alloy in the feeding pipe is calculated according to the service life of the EBT steel tapping hole and the amount of the alloy to be added, the included angle between the feeding pipe and the horizontal plane is adjusted in advance, and the optimal time for adding the alloy elements into the molten steel is ensured, so that a better preliminary alloying effect of the electric furnace is obtained, and the expected production requirement is met.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (3)
1. A method for controlling the alloy adding speed of an electric furnace EBT steel tapping feed pipe is characterized by comprising the following steps: the control method is realized based on a control device, the control device comprises a horizontal bracket (4), and one end of the horizontal bracket (4) is hinged with a support frame (3); a feeding pipe (1) is arranged above the supporting frame (3) in parallel and is fixedly connected with the supporting frame; an angle instrument (6) is arranged between the support frame (3) and the horizontal support frame (4), the angle instrument (6) is fixedly connected with the support frame (3), and the angle instrument (6) is used for detecting an included angle between the support frame (3) and the horizontal support frame (4) and further detecting an included angle between the feeding pipe (1) and a horizontal plane;
the control method comprises the following steps:
step one, determining the addition W of the alloy A element A ：
According to the requirements of a smelting steel seed guide card on the content of the element A in molten steel after tapping being X1%, the content of the element A in the alloy being a%, and the total tapping amount of the electric furnace being W tons, obtaining that the weight of the element A to be added is W A =W×X1%÷a%；
Step two, predicting the time T required by tapping n ：
The tapping time of the first time of the use of the EBT tapping hole of the electric furnace is recorded as T First stage The tapping time of the steel is recorded as T when the steel is used for the last time before the EBT tapping hole is replaced, namely N Terminal Then use the time T of the nth time n =T First stage -n×（T First stage -T Final (a Chinese character of 'gan') ）/N；
Step three, obtaining the speed V required by adding alloy into molten steel A goes out ：
The average feeding speed required by the alloy is V A The initial velocity of the alloy is V A is first 0, the outlet velocity of the alloy A element in the feeding pipe is V A =（V A is first + V A goes out ) /2, obtaining V A goes out =2V A ；
Average feed rate V A ＝W A /[（2/3T n -1/3T n ）×S A ]Wherein S is A The weight of the element A in the feeding pipe is shown; said S A =1/5×S Section bar X V, wherein, S Cutting block =πr 2 R is the diameter of the feeding pipe, and V is the weight of the alloy A element in each cubic meter;
step four, calculating an included angle alpha between the feeding pipe and the horizontal plane: according to the calculation formula: v A is out 2 =L×g×（sinα-fa×cosα）/2，
Wherein: l is the length of the charging tube, g is the gravity acceleration, and the constant is 9.8; fa is the friction coefficient between the alloy A element and the charging pipe;
step five, determining an included angle alpha 'between the feeding pipe and the horizontal plane, and taking the whole after the alpha' is alpha +5 degrees;
and step six, rotating the support frame to enable an included angle between the support frame and the horizontal support frame to be alpha'.
2. The method for controlling the alloy adding speed of the electric furnace EBT tapping feeding pipe according to claim 1, is characterized in that: the angle gauge is characterized in that a plurality of fixed teeth are arranged on the circumference of the angle gauge (6), the fixed teeth are evenly arranged at intervals, and a rack which is vertically arranged is arranged on the horizontal support and is meshed with the fixed teeth.
3. The method for controlling the alloy adding speed of the electric furnace EBT tapping feeding pipe according to claim 2, characterized by comprising the following steps: and a 0-degree marking line is marked at the connecting side of the angle instrument and the support frame, and the 0-degree marking line corresponds to the superposition position of the support frame and the horizontal support.
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