CN114166148A - Detection control method and system for continuous charging of metallurgical furnace - Google Patents
Detection control method and system for continuous charging of metallurgical furnace Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 31
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- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
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- 238000009845 electric arc furnace steelmaking Methods 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0691—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of objects while moving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/28—Measuring arrangements characterised by the use of optical techniques for measuring areas
- G01B11/285—Measuring arrangements characterised by the use of optical techniques for measuring areas using photoelectric detection means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/50—Systems of measurement based on relative movement of target
- G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0001—Positioning the charge
- F27D2003/0004—Positioning the charge involving devices for measuring the article, the stack of articles or the height of the furnace passage or for adjusting the height of the passage to the charge or for putting the articles in the same position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Power Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
The invention relates to a detection control method and a system for continuous charging of a metallurgical furnace, belonging to the technical field of solid furnace charge conveying, comprising the steps of obtaining the size information and the position information of each furnace charge infinitesimal Di between a position P1 and a position P2, and the conveying speed Vc of the furnace charge, wherein the position P1 is positioned in an open area close to a preheating area, and the position P2 is positioned at an outlet of the preheating area; predicting the flow rate of the furnace burden which passes through the position P2 according to the size information and the position information of each furnace burden infinitesimal Di between the position P1 and the position P2 and the conveying speed Vc; and adjusting the working frequency of the conveyor according to the requirements of the metallurgical furnace to control the conveying speed Vc, so as to realize the control of the flow of the burden passing through the position P2, and further realize the accurate detection and control of the flow of the burden.
Description
Technical Field
The invention belongs to the technical field of solid furnace charge conveying, and relates to a detection control method and a detection control system for continuous charging of a metallurgical furnace.
Background
The main raw materials for electric arc furnace steel making are scrap steel and other furnace materials, and the feeding mode comprises a batch feeding mode and a continuous feeding mode. When the electric arc furnace continuously feeds materials, the control of the feeding speed is very important, the insufficient feeding speed influences the production efficiency, the too high feeding speed leads furnace materials to be accumulated in a blanking area to form a cold area which is difficult to melt, and the electrode directly discharges metals such as scrap steel and the like exposed out of the surface of a molten pool, so that the electric arc cannot be buried by foam slag all the time, energy loss is caused, and a furnace lining and equipment are corroded.
The weight of the furnace burden added into the furnace can be measured by a furnace body weighing mode, and the weight information of the sensor can not accurately reflect the weight of the furnace burden added into the furnace because the molten pool continuously discharges slag outwards during smelting. This method has hysteresis, and since the thickness of the charge in the conveyor is not constant, the rate of charge addition always fluctuates between excess and deficiency. In addition, the weighing sensor is in a severe working environment with high temperature and high dust area, and the sensor itself and power supply and signal cables thereof are easy to damage.
The patent application No. 201180039801.3 proposes the control and tracking of the material being transported by a continuous feed conveyor by identifying and obtaining the overall dimensions of each portion of charge by means of an electromagnetic radiation emitter or the like. In fact, at the instant of loading of the charge into the conveyor and during the subsequent conveying process, the charge collapses inside the conveyor and each time the charge is loaded mixes with each other, the bed of material reaches a stable condition only after a certain conveying distance, which technique detects the overall dimensions of each portion of the charge loaded, which is difficult to achieve.
The material transport speed is typically the distance the material has traveled over a certain period of time, and the average speed is calculated accordingly. The vibration conveying of the electric arc furnace is different from the chain conveying and the belt conveying, the acceleration, the speed and the displacement of the material have larger fluctuation in each vibration period, and the average speed calculated by the conventional method has larger error.
Disclosure of Invention
In view of this, the present invention provides a method and a system for detecting and controlling continuous charging of a metallurgical furnace, so as to accurately detect and control the flow rate of a charging material.
In order to achieve the purpose, the invention provides the following technical scheme:
a detection control method for continuous charging of a metallurgical furnace comprises the following steps: acquiring the size information and the position information of each furnace burden infinitesimal Di between a position P1 and a position P2, and the conveying speed Vc of the furnace burden, wherein the position P1 is positioned in an open area close to a preheating area, and the position P2 is positioned at an outlet of the preheating area; predicting the flow rate of the furnace burden which passes through the position P2 according to the size information and the position information of each furnace burden infinitesimal Di between the position P1 and the position P2 and the conveying speed Vc; the working frequency of the conveyor is adjusted according to the requirements of the metallurgical furnace to control the conveying speed Vc, and the control of the flow rate of the burden passing through the position P2 is realized.
Optionally, firstly, acquiring and recording the size information of the furnace burden infinitesimal Di passing through the position P1 at the frequency f1, then acquiring the conveying speed Vc of the furnace burden, and then simulating the position Li of the furnace burden infinitesimal Di in the conveyor; then, the flow passing through a position P2 is calculated by using a formula V-Ai-Vc, Ai is the section area of a furnace material infinitesimal Di, whether the instantaneous flow meets the requirements of the metallurgical furnace is judged according to the flow at the position P2, and the flow in a future period of time is predicted according to the simulation result of the simulated furnace material infinitesimal Di, so that the adjustment has lead.
Optionally, the charge infinitesimal Di is the charge passing through position P1 between scans.
Optionally, the size information of the burden infinitesimal Di includes a cross-sectional profile, a cross-sectional area and an equivalent thickness of the material layer.
Optionally, the surface profile information of the cross-sectional profile is a plurality of points after the cross-sectional burden is scanned.
Optionally, the simulation method for the position Li of the burden infinitesimal Di comprises the following steps:
a. acquiring the conveying speed Vci of furnace burden;
b. acquiring the conveying time ti of the furnace burden infinitesimal Di when the conveying speed is Vci;
c. the position Li is modeled by the formula Li ═ Σ Vci ═ ti.
Optionally, the method for obtaining the conveying speed Vc of the burden comprises the following steps:
a. acquiring the vibration working frequency f2 of the conveyor;
b. acquiring position information of a furnace burden infinitesimal Di at the frequency of f2/n, wherein n is a positive integer;
c. obtaining the passing distance L of the furnace burden within delta t time;
d. the conveyance speed Vc is calculated by the equation Vc ═ L/Δ t.
Optionally, size information of the burden infinitesimal Di at the passing position P1 is obtained at the same frequency as the working frequency of the conveyor, and the burden infinitesimal Di position information is position information of a characteristic area of the burden, and the characteristic area comprises characteristic points, characteristic blocks and characteristic outlines.
A detection control system for continuous charging of a metallurgical furnace comprises a size detection unit: the device is positioned in the open area and used for acquiring the size information of the furnace material infinitesimal Di and the time when the furnace material infinitesimal Di passes through the open area at the frequency f 1; a speed detection unit: the device is positioned in the open area and used for obtaining the conveying speed Vc of the burden; a processing unit: the device is used for recording the size information, the speed information and the time information of the furnace burden infinitesimal Di, simulating the position Li of the furnace burden infinitesimal Di, and calculating the flow rate of the furnace burden passing through the position P2 and the total amount of the furnace burden accumulated in each furnace.
Optionally, the size detection unit and the speed detection unit share the same device, the size detection unit and the speed detection unit are laser radar or laser scanner, and the size detection unit and the speed detection unit are located above the burden in the open area and are in non-contact with the burden.
The invention has the beneficial effects that: the detection unit is not in contact with furnace burden and is positioned in a low-temperature open area, so that the working environment is friendly, and the service life is long; the hardware investment is saved, and the detection unit only uses one set of laser radar or laser scanner; the detection precision is high, and the influence of ambient light interference is avoided; the feeding speed detection control is more timely and accurate; the distribution state and the quantity of the furnace burden in the conveying groove can be counted and displayed in real time, and more decision information is provided for a control system and an operator.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is an elevation view of a schematic of a test control system;
FIG. 2 is a plan view of a schematic of the inspection control system;
FIG. 3 is a cross-sectional view at position P1 in FIG. 1;
FIG. 4 is a schematic flow chart;
FIG. 5 is a schematic view of a charge infinitesimal;
FIG. 6 is a schematic view of a simulation of the position of a infinitesimal charge;
FIG. 7 is a schematic view of the instantaneous velocity of the vibratory conveying of charge material.
Reference numerals: electric furnace 1, conveyor 2, charge 3, open area 21, preheating area 22, transition area 23, size detection unit 24, speed detection unit 25, processing unit 26, surface profile 31, conveyor trough profile 211.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 7, a method for detecting and controlling continuous charging of a metallurgical furnace, a charge 3 is transported by a conveyor 2, the conveyor 2 has an open area 21 for charging and a preheating area 22 covered by a cover plate, comprising the following steps: acquiring the size information and the position information of each furnace burden infinitesimal Di between a position P1 and a position P2, and the conveying speed Vc of the furnace burden 3, wherein the position P1 is positioned in the open zone 21 close to the preheating zone 22, and the position P2 is positioned at the outlet of the preheating zone 22; predicting the flow rate of the furnace burden which passes through the position P2 according to the size information and the position information of each furnace burden infinitesimal Di between the position P1 and the position P2 and the conveying speed Vc; the control of the flow of charge material through position P2 is achieved by adjusting the operating frequency of the conveyor 2 to control the conveying speed Vc in accordance with the metallurgical requirements.
Specifically, the method comprises the following steps: a. acquiring and recording the size information of the furnace burden infinitesimal Di at a passing position P1 at a frequency f 1; b. acquiring the conveying speed Vc of the furnace burden 3; c. simulating the position Li of a furnace burden infinitesimal Di in the conveyor 2; d. calculating the flow passing through the position P2 by using the formula V-Ai-Vc, wherein Ai is the section area of the furnace burden infinitesimal Di; e. judging whether the instantaneous flow meets the requirements of the metallurgical furnace or not according to the flow at the position P2, and predicting the flow in a future period of time according to the simulation result of the simulation furnace burden infinitesimal Di so as to lead the adjustment to have lead; f. if the requirements of the metallurgical furnace are not met, the working frequency of the conveyor 2 is adjusted to control the conveying speed Vc, so as to control the flow rate of the burden passing through the position P2.
The burden infinitesimal Di is the burden 3 passing through the position P1 between two scans, and the size information of the burden infinitesimal Di can be the cross-sectional profile (surface profile and the profile enclosed by the trough), the cross-sectional area and the equivalent thickness of the material layer. The surface profile information of the surface profile is a plurality of points after the section of the furnace burden is scanned.
In a possible embodiment, step b comprises: acquiring the vibration working frequency f2 of the conveyor 2; acquiring the position information of the furnace charge 3 at the frequency of f2/n, wherein n is a positive integer; acquiring the passing distance L of the furnace burden 3 within delta t time; the conveyance speed Vc is calculated by the equation Vc ═ L/Δ t. The position information of the charge 3 is preferably the position of a characteristic region (characteristic point, characteristic block, characteristic profile, etc.) of the charge 3.
In a possible embodiment, step c comprises: and acquiring the conveying speed Vci of the furnace burden 3, acquiring the conveying time ti of the furnace burden infinitesimal Di when the conveying speed is Vci, and calculating the simulation position Li by using the formula Li ═ Sigma Vci × ti.
A detection control system for continuous charging of a metallurgical furnace comprises a size detection unit 24: the device is positioned in the open area 21 and used for acquiring the size information of the furnace burden infinitesimal Di and the time when the furnace burden infinitesimal Di passes through the open area at the frequency f 1; speed detection unit 25: located in open area 21 for obtaining a conveying speed Vc of charge 3; the processing unit 26: the device is used for recording the size information, the speed information and the time information of the furnace burden infinitesimal Di, simulating the position Li of the furnace burden infinitesimal Di, and calculating the flow rate of the furnace burden passing through the position P2 and the total amount of the furnace burden 3 accumulated in each furnace.
In a possible implementation, the size detection unit 24 and the speed detection unit 25 share the same device, the size detection unit 24 and the speed detection unit 25 are laser radar or laser scanner, and the size detection unit 24 and the speed detection unit 25 are located above the burden 3 in the open area 21 and are not in contact with the burden 3.
Example 1
A system for detecting and controlling the continuous charging of a metallurgical furnace, a charge material is supplied to the metallurgical furnace 1, and a charge material 3 is continuously conveyed by a conveyor 2. The metallurgical furnace is preferably a steelmaking arc furnace, and may be of a converter type such as a converter or an induction furnace. The conveyor is preferably a vibrating conveyor. The conveyor 2 is provided with an open area 21, a preheating area 22 covered by a cover plate, and a transition area 23 between the preheating area and the metallurgical furnace. The burden enters the electric furnace 1 from the open area 21 through the preheating area 22 and the transition area 23.
For ease of description, 3 locations are defined on the conveyor, with location P1 located near the preheat zone, location P2 located at the preheat zone exit, and location P3 located at the transition zone exit.
In this embodiment, the open zone also has a charging function, and the furnace charge has the same speed in the open zone and the preheating zone. Of course, another conveyor may be used for loading. Usually, the transition area adopts an independent conveyor, and also can preheat the furnace charge, so the top is shielded by a cover plate, the transition section is shorter, the conveying speed is generally kept unchanged, and a real-time detection mode is not needed.
A size detection unit 24 is provided at a position (P1) of the open zone 21 close to the preheating zone 22, and detects the surface profile 31 of the charge to obtain the size information of the infinitesimal Di of the charge, and the size detection unit 24 is specifically a device such as a laser scanner, a radar, a camera, and the like. The dimension detection device 24 in this embodiment is a laser scanner, and preferably obtains the charge profile information of the cross section perpendicular to the conveying direction at the same frequency as the working frequency of the conveyor. The frequency of the conveyor is generally 3-5 Hz, and the same frequency has the advantages that the furnace burden profile information cannot be repeatedly detected, and the processing algorithm is simple. Certainly, the frequency of the laser scanner can also be improved, and if the scanning is carried out at 25Hz, the moving distance of the furnace burden between two times of scanning is 4-5 mm.
As shown in fig. 3, the information of the surface profile 31 of the charge material can be combined with the profile 211 of the conveying trough to calculate the sectional area of the charge material infinitesimal, and also obtain the equivalent thickness of the sectional area. In the embodiment, the volume of the furnace burden infinitesimal Di passing through the position in each scanning is approximately represented by the product of the furnace burden infinitesimal sectional area and the furnace burden moving distance dx between two times of scanning, and the result of calculating the volume of the furnace burden infinitesimal can be more accurate by taking the average value of the sectional areas of the two times of scanning.
The burden conveying speed detection unit 25 is located above the conveyor. And acquiring the vibration operating frequency f2 of the conveyor, and acquiring the position information of the furnace burden infinitesimal Di at the frequency of f2/n, wherein n is a positive integer. The position information detection device for acquiring the furnace burden infinitesimal Di is preferably a laser scanner and can also be an industrial camera. In order to reduce the system computation amount and improve the response speed, the furnace charge position information is preferably position information of a furnace charge characteristic area, and the characteristic area refers to a characteristic point, a characteristic block, a characteristic outline and the like. And acquiring the distance L of the charge passing through the time delta t, and calculating the conveying speed Vc by using the formula Vc-L/delta t, wherein the delta t-n/f 2. The size detection unit 24 and the speed detection unit 25 may be the same device for acquiring the furnace material profile information. When the vibration frequency of the conveyor is f2, the frequency of the furnace burden moving every time one period is f2, and the speed of the furnace burden moving in each period has large fluctuation, which is usually 0 to 0.3m/s shown in fig. 7. The position information of the furnace burden infinitesimal Di is detected at the frequency of f2/n, namely the furnace burden just finishes n periods of movement during each detection, and the average conveying speed Vc obtained by detection and calculation is more accurate. When the detection frequency can not meet the requirement, the selection of the delta t determines the detection result error, and if the delta t is larger than 100/f2, the result error is smaller than 1%.
The system also comprises a processing unit 26 which receives information such as the size detection unit 24, the speed detection unit 25, the bulk density of the furnace material, the requirement of the furnace material of the electric furnace, the working frequency of the conveyor and the like, analyzes and calculates the information and outputs the working frequency of the conveyor.
The system of the embodiment has the advantages that: the detection device is not in contact with furnace burden and is positioned in a low-temperature open area, so that the working environment is friendly, and the service life is long; the hardware investment of the detection device is saved, and only one set of laser radar or laser scanner is used; the detection precision is high, and the influence of ambient light interference is avoided; the conveying speed detection is more accurate.
Example 2
A detection control method for continuous charging of a metallurgical furnace can be implemented by the system, and particularly to each heat, with reference to figures 4, 5 and 6, the specific implementation method is as follows:
s101, setting the working frequency of a conveyor;
s102, operating a conveyor;
s103, preferably acquiring and recording the size information of a furnace burden infinitesimal Di at a passing position P1 at a frequency of 25Hz, specifically, a surface profile Si, and calculating the section area Ai of the furnace burden infinitesimal Di, wherein the Ai is an area enclosed between the surface profile 31 of the furnace burden and the trough profile 211; in practical implementation, for convenience of display and statistics, the equivalent thickness h of a material layer is obtained by dividing the available area Ai by the width of a material groove and is used as the characteristic size of the furnace material infinitesimal Di;
s104, acquiring the furnace charge conveying speed, wherein the specific method comprises the following steps: and acquiring the vibration operating frequency f2 of the conveyor, and acquiring the position information of the furnace burden infinitesimal Di at the frequency of f2/n, wherein n is a positive integer. Acquiring the passing distance L of the furnace burden within the time delta t, and calculating the conveying speed Vc by using the formula Vc ═ L/delta t;
s105, simulating the position Li of the furnace burden infinitesimal Di in the conveyor, wherein the specific method comprises the following steps: acquiring the conveying speed Vci of the furnace charge, acquiring the conveying time ti of the furnace charge infinitesimal Di when the conveying speed is Vci, and calculating the simulation position Li by using the formula Li ═ Vci × ti;
s106, calculating the instantaneous flow of the furnace burden passing through the position P2, and calculating a formula V-Ai-Vc;
s107, judging whether the instantaneous flow meets the requirements of the metallurgical furnace; the flow can be judged, and the flow in a future period of time can be predicted according to the simulation result at the S105, so that the adjustment has an advance;
s108, if the flow is too large or too small, adjusting the working frequency of the conveyor;
s109, if the flow rate meets the requirement, keeping the current furnace charge conveying speed;
s110, calculating the cumulative charge addition of the current heat;
s111, judging whether the charge amount of the furnace burden reaches a set value of the furnace number;
and S112, if the set value is reached, stopping the operation of the conveyor or reducing the frequency to a non-operation frequency, and the burden is not conveyed forwards any more.
The process of the invention describes the flow detection and control of the charge material passing through the preheating zone position P2, the transition zone using a separate conveyor, the conveying distance of which is only a fraction of that of the preheating zone and the conveying speed is generally constant, and the charge material passing through the position P2 and then reaching the transition zone outlet P3, i.e. reaching the furnace, after a certain substantially fixed time.
The method of the invention can also display the distribution state of the furnace burden in the preheating zone in real time, the control of the charging speed is more timely and accurate, and the material conveying flow in a future period of time can be predicted.
The flow rates are volume flow rates, the bulk density of the furnace burden is obtained, and the mass flow rate and the total weight of each charging process can be obtained.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A detection control method for continuous charging of a metallurgical furnace is characterized by comprising the following steps: the method comprises the following steps: acquiring the size information and the position information of each furnace burden infinitesimal Di between a position P1 and a position P2, and the conveying speed Vc of the furnace burden, wherein the position P1 is positioned in an open area close to a preheating area, and the position P2 is positioned at an outlet of the preheating area; predicting the flow rate of the furnace burden which passes through the position P2 according to the size information and the position information of each furnace burden infinitesimal Di between the position P1 and the position P2 and the conveying speed Vc; the working frequency of the conveyor is adjusted according to the requirements of the metallurgical furnace to control the conveying speed Vc, and the control of the flow rate of the burden passing through the position P2 is realized.
2. The method for detecting and controlling the continuous charging of a metallurgical furnace according to claim 1, wherein: firstly, acquiring and recording the size information of a furnace burden infinitesimal Di passing through a position P1 at a frequency f1, then acquiring the conveying speed Vc of the furnace burden, and simulating the position Li of the furnace burden infinitesimal Di in a conveyor; then, the flow passing through a position P2 is calculated by using a formula V-Ai-Vc, Ai is the section area of a furnace material infinitesimal Di, whether the instantaneous flow meets the requirements of the metallurgical furnace is judged according to the flow at the position P2, and the flow in a future period of time is predicted according to the simulation result of the simulated furnace material infinitesimal Di, so that the adjustment has lead.
3. The method for detecting and controlling the continuous charging of a metallurgical furnace according to claim 1, wherein: the charge infinitesimal Di is the charge passing through position P1 between scans.
4. The method for detecting and controlling the continuous charging of a metallurgical furnace according to claim 1, wherein: the size information of the furnace burden infinitesimal Di comprises a cross-sectional profile, a cross-sectional area and the equivalent thickness of a material layer.
5. A method for the detection and control of the continuous charging of a metallurgical furnace according to claim 4, characterized in that: and the surface profile information of the cross section profile is a plurality of points after the cross section furnace burden is scanned.
6. The method for detecting and controlling the continuous charging of a metallurgical furnace according to claim 2, wherein: the simulation method of the position Li of the furnace burden infinitesimal Di comprises the following steps:
a. acquiring the conveying speed Vci of furnace burden;
b. acquiring the conveying time ti of the furnace burden infinitesimal Di when the conveying speed is Vci;
c. the position Li is modeled by the formula Li ═ Σ Vci ═ ti.
7. The method for detecting and controlling the continuous charging of a metallurgical furnace according to claim 1, wherein: the method for acquiring the conveying speed Vc of the furnace burden comprises the following steps:
a. acquiring the vibration working frequency f2 of the conveyor;
b. acquiring position information of a furnace burden infinitesimal Di at the frequency of f2/n, wherein n is a positive integer;
c. obtaining the passing distance L of the furnace burden within delta t time;
d. the conveyance speed Vc is calculated by the equation Vc ═ L/Δ t.
8. The method for detecting and controlling the continuous charging of a metallurgical furnace according to claim 2, wherein: and acquiring the size information of the furnace burden infinitesimal Di at the position P1 at the same frequency as the working frequency of the conveyor, wherein the position information of the furnace burden infinitesimal Di is the position information of a furnace burden characteristic area, and the furnace burden characteristic area comprises characteristic points, characteristic blocks and characteristic profiles.
9. A detection control system for continuous charging of a metallurgical furnace is characterized in that: comprises that
A size detection unit: the device is positioned in the open area and used for acquiring the size information of the furnace material infinitesimal Di and the time when the furnace material infinitesimal Di passes through the open area at the frequency f 1;
a speed detection unit: the device is positioned in the open area and used for obtaining the conveying speed Vc of the burden;
a processing unit: the device is used for recording the size information, the speed information and the time information of the furnace burden infinitesimal Di, simulating the position Li of the furnace burden infinitesimal Di, and calculating the flow rate of the furnace burden passing through the position P2 and the total amount of the furnace burden accumulated in each furnace.
10. The system of claim 9, wherein the system comprises: the size detection unit and the speed detection unit share the same device, the size detection unit and the speed detection unit are laser radars or laser scanners, and the size detection unit and the speed detection unit are located above the furnace burden in the open area and are in non-contact with the furnace burden.
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