CN108165690B - Blast furnace flow valve control method - Google Patents
Blast furnace flow valve control method Download PDFInfo
- Publication number
- CN108165690B CN108165690B CN201711460119.7A CN201711460119A CN108165690B CN 108165690 B CN108165690 B CN 108165690B CN 201711460119 A CN201711460119 A CN 201711460119A CN 108165690 B CN108165690 B CN 108165690B
- Authority
- CN
- China
- Prior art keywords
- blast furnace
- material flow
- pressure
- flow valve
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention provides a control method of a blast furnace material flow valve, wherein sensors are respectively arranged in a blast furnace and a weighing tank at the upper part of the blast furnace, a plurality of groups of material weight W, blast furnace internal top pressure P1, weighing tank internal pressure P2 and blast furnace top temperature T signals are collected and sent to a PLC control system for processing and calculation, and a material flow velocity V relation equation of the material flow valve is obtained according to an empirical data curve fitting method. Formally carrying out automatic control on the material flow valve, sending the collected material weight W, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the top temperature T of the blast furnace into the PLC control system by the PLC control system for processing and calculation, and solving a control set value of the material flow speed V according to a material flow valve speed equation. The top pressure in the blast furnace, the pressure in the weighing tank and the temperature value at the top of the blast furnace are introduced into the opening control of the material flow valve of the material distribution system, and a material flow velocity equation is obtained by a sample parameter model curve fitting method, so that the material flow velocity can be accurately controlled.
Description
Technical Field
The invention relates to the technical field of blast furnace multi-ring distribution material flow valve control, in particular to a blast furnace material flow valve control method.
Background
At present, the bell-less blast furnace burden distribution mainly adopts two modes: the material distribution method comprises the steps of time multi-ring material distribution and weight multi-ring material distribution, and aims to uniformly distribute raw materials in a furnace and have a stabilizing effect on the shape of the furnace. The material flow valve is a valve used in multi-ring material distribution of the blast furnace, and iron ore passes through the material flow valve in a weighing tank and a chute to enter the throat of the blast furnace. The opening of the material flow valve controls the material flow speed, further controls the distribution of the material level in the furnace, and further determines the production efficiency of the blast furnace, and the material flow valve is mainly manually controlled and set at the present stage, and mainly has the following defects:
under the condition of manual setting, when the distribution time has errors every time, the distribution time must be reset, and the distribution time is continuously observed and adjusted to a correct production state, so that the workload of personnel is increased.
The existing automatic setting mode only considers the weight factor, but the conditions in the furnace are complicated and changeable, the self-adaptive adjustment time is long, and the requirements of the production environment cannot be completely met.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a blast furnace material flow valve control method, wherein the top pressure in a blast furnace, the pressure in a weighing tank and the temperature value at the top of the blast furnace are introduced into the opening control of a material flow valve of a material distribution system, a material flow velocity equation is obtained by a sample parameter model curve fitting method, and the material flow velocity can be accurately controlled.
In order to achieve the purpose, the invention adopts the following technical scheme:
a blast furnace burden flow valve control method, said method comprising the steps of:
step one, sensors are respectively arranged in a blast furnace and a weighing tank at the upper part of the blast furnace, and are used for detecting the weight W of materials in the weighing tank, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T at the top of the blast furnace.
And secondly, firstly, collecting a plurality of groups of signals of the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T of the top of the blast furnace, sending the signals into a PLC control system for processing and calculation, and obtaining a relation equation between the material flow speed V of the material flow valve and the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T of the top of the blast furnace according to an empirical data curve fitting method.
And thirdly, formally automatically controlling the material flow valve, sending the collected weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the top temperature T of the blast furnace into the PLC control system by the PLC control system for processing and calculation, and solving a control set value of the material flow speed V according to the speed equation of the material flow valve obtained in the second step.
And step four, the PLC control system adjusts the opening of the material flow valve according to the control set value of the material flow speed V.
The second step specifically comprises the following steps:
step 201, firstly, collecting a plurality of groups of initial values, and enabling each group of initial values to correspond to a material flow velocity V experience value to form an initial parameter sample;
step 202, summing the variables affecting the flow velocity as: x1:
x2: Δ T/T0, X3: three variables, Δ P/P0, wherein: w is the weight of the material, CnIs given in parts, n is the ring position, t is the unitTime, wherein delta T is the difference value between the furnace top temperature and the normal temperature, T0 is the normal temperature, P0 is the standard atmospheric pressure, and delta P is the difference value between the pressure in the furnace and the pressure of the receiving tank P1-P2;
step 203, performing multivariate curve fitting on the initial parameter samples through software to obtain a material flow velocity equation:
wherein: k is a material coefficient, k1 is a temperature coefficient, and k2 is a pressure coefficient, and is obtained by curve fitting software;
namely a relational equation between the material flow velocity V of the material flow valve, the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T at the top of the blast furnace;
and step 204, gradually correcting the values of k, k1 and k2 according to the running condition in the actual running control to meet the requirement of control precision.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a blast furnace burden flow valve control method, which introduces the top pressure in a blast furnace, the pressure in a weighing tank and the temperature value at the top of the blast furnace into the opening control of a burden flow valve of a distribution system, obtains a material flow velocity equation by a sample parameter model curve fitting method, uses a software model for interference elimination, and has the characteristics of stable operation, high calculation speed and suitability for industrial field working environment; and the stable multi-ring weight of the blast furnace and the time distribution are realized after a blast furnace burden flow valve opening degree control system is adopted without introducing new detection equipment for upgrading, the yield can be improved, and the investment can be reduced. ,
drawings
FIG. 1 is a diagram of a sensor arrangement for a blast furnace burden flow valve control method of the present invention;
FIG. 2 is a PLC control system diagram of a blast furnace burden flow valve control method of the present invention.
In the figure: 1-blast furnace 2-material flow valve 3-weighing tank 4-blast furnace internal top pressure P1 sensor measuring point 5-blast furnace top temperature sensor T measuring point 6-material weight W sensor measuring point 7-weighing tank internal pressure P2 sensor measuring point.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
A blast furnace burden flow valve control method introduces the top pressure P1 in a blast furnace, the pressure P2 in a weighing tank and the temperature T value of the top of the blast furnace into the opening control of a burden flow valve of a material distribution system, and can accurately control the material flow speed.
The method comprises the following steps:
step one, sensors are respectively arranged in a blast furnace 1 and a weighing tank 3 at the upper part of the blast furnace 1 and are used for detecting the weight W of materials in the weighing tank 2, the top pressure P1 in the blast furnace 1, the pressure P2 in the weighing tank 2 and the top temperature T of the blast furnace 1.
As shown in FIG. 1, 1 is a blast furnace, 2 is a material flow valve, 3 is a weighing tank, 4 is a measuring point of a top pressure P1 sensor in the blast furnace, 5 is a measuring point of a temperature sensor T at the top of the blast furnace, 6 is a measuring point of a material weight W sensor in the weighing tank, and 7 is a measuring point of a pressure P2 sensor in the weighing tank.
And step two, as shown in figure 2, firstly, collecting a plurality of groups of signals of the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T of the top of the blast furnace, sending the signals into a PLC control system for processing and calculation, and obtaining a relation equation between the material flow speed V of the material flow valve and the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T of the top of the blast furnace according to an empirical data curve fitting method.
And thirdly, formally performing automatic control on the material flow valve as shown in figure 2, sending the collected weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T of the top of the blast furnace into the PLC control system by the PLC control system for processing and calculation, and calculating a control set value of the material flow speed V according to the speed equation of the material flow valve obtained in the second step.
Step four, as shown in fig. 2, the opening of the material flow valve is adjusted by the PLC control system according to the control set value of the material flow speed V. The opening degree of the material flow valve and the material flow speed are in one-to-one correspondence (see formula 2), and the PLC control system calculates the valve opening degree value according to the material flow speed V and controls the opening degree of the valve.
The second step specifically comprises the following steps:
step 201, firstly, collecting a plurality of groups of initial values, and enabling each group of initial values to correspond to a material flow velocity V experience value to form an initial parameter sample;
step 202, summing the variables affecting the flow velocity as: x1:
x2: Δ T/T0, X3: three variables, Δ P/P0, wherein: w is the weight of the material, CnThe method comprises the following steps of (1) counting, wherein n is a ring position, T is unit time, delta T is a difference value between the furnace top temperature and the normal temperature, T0 is the normal temperature, P0 is standard atmospheric pressure, and delta P is the difference value between the furnace pressure and the receiving tank pressure P1 is P2;
in the blast furnace annular material distribution, a plurality of rings are arranged from the center to the outside (blast furnace multi-ring material distribution mode), and Cn: the number of parts is the number of parts of the material W divided by the number of distribution rings n of the blast furnace, and t is the time for distributing one part of the material, and is set to be constant, usually in practice, 8 seconds for 6 seconds.
Step 203, performing multivariate curve fitting on the initial parameter samples through software to obtain a material flow velocity equation:
wherein: k is a material coefficient, k1 is a temperature coefficient, and k2 is a pressure coefficient, and is obtained by curve fitting software;
namely a relational equation between the material flow velocity V of the material flow valve, the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T at the top of the blast furnace;
the curve fitting software may employ MATLAB software. The method is completed in an upper computer (computer) of the PLC control system.
And step 204, gradually correcting the values of k, k1 and k2 according to the running condition in the actual running control to meet the requirement of control precision.
| Total parts of | Total weight W (Kg) | Degree of opening (degree) | Pressure Δ P (kPa) | Temperature Δ T (. degree. C.) |
| 17 | 90 | 44 | 122 | 14 |
| 16 | 88 | 42 | 120 | 13 |
| 16 | 86 | 40 | 121 | 13 |
| 15 | 86 | 40.5 | 120 | 14 |
| 14 | 86 | 39.5 | 120 | 13 |
TABLE 1
As shown in the above table, the initial parameter sample table is a table, where the opening degree is the opening degree of the material flow valve, and the opening degree of the material flow valve and the material flow rate are in a one-to-one correspondence relationship, that is, the opening degree can directly obtain the material flow rate V, for example: the material flow valve of PW company, which is mostly adopted in the blast furnace multi-ring material distribution equipment, is provided by a manufacturer with a corresponding relation formula of material flow speed and opening degree as follows:
in the formula, y is a flow velocity (i.e., V), x is an opening degree, S is an opening area, l is an opening circumference, λ is a flow coefficient, and g is a gravitational acceleration of 9.8.
As described above, the opening degree of the material flow valve and the material flow velocity are in a one-to-one correspondence relationship, so that the value of the material flow velocity V can be directly calculated from the opening degree value. The data in table 1 can be used as initial samples for curve fitting from which the flow rate relationship equation (1) is calculated.
In addition, the control of the opening degree of the material flow valve by the material flow speed V in the fourth step of the blast furnace material flow valve control method is also based on the one-to-one correspondence relationship between the opening degree of the material flow valve and the material flow speed, and the PLC control system calculates the valve opening degree value according to the material flow speed V and controls the valve opening degree.
As shown in fig. 2, the blast furnace burden flow valve control system using the blast furnace burden flow valve control method comprises a burden weighing system, a furnace top pressure instrument system, a PLC control system, a distribution control system, and a display recording system, wherein a weighing sensor in the burden weighing system collects a weight signal of a raw material of a measuring hopper, converts the weight signal into a standard signal of 4-20mA by a signal transmitter, and sends the standard signal into the PLC control system; meanwhile, a furnace top pressure instrument system sends a furnace top pressure signal and a furnace top temperature signal to the PLC control system according to a standard signal of 4-20mA from a pressure transmitter. The PLC control system receives the weight, pressure and temperature signals, interference is removed through calculation according to software design of the PLC control system, the material flow velocity is calculated, the opening degree of the material flow valve is obtained, and finally the opening degree of the material flow valve is output. And analyzing the feedback data for self-adaptive adjustment, wherein the display recording system is a man-machine interface consisting of a computer and application software, acquires various signals and data from the PLC system through network communication, displays the signals and the data on a screen, and simultaneously records the signals and the data into a historical database to form a historical record for analyzing the data.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (1)
1. A blast furnace burden flow valve control method, characterized in that said method comprises the steps of:
respectively arranging sensors in weighing tanks at the upper parts of a blast furnace and the blast furnace, wherein the sensors are used for detecting the weight W of materials in the weighing tanks, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tanks and the temperature T of the top of the blast furnace;
secondly, firstly, collecting signals of a plurality of groups of material weight W, blast furnace internal top pressure P1, weighing tank internal pressure P2 and blast furnace top temperature T, sending the signals into a PLC control system for processing and calculation, and obtaining a relation equation between material flow velocity V of a material flow valve and material weight W, blast furnace internal top pressure P1, weighing tank internal pressure P2 and blast furnace top temperature T according to an empirical data curve fitting method;
step 201, firstly, collecting a plurality of groups of initial values, and enabling each group of initial values to correspond to a material flow velocity V experience value to form an initial parameter sample;
step 202, summing the variables affecting the flow velocity as: x1:
X2：ΔT/T0、x3: three variables, Δ P/P0, wherein: w is the weight of the material, CnThe method comprises the following steps of (1) counting, wherein n is a ring position, T is unit time, delta T is a difference value between the furnace top temperature and the normal temperature, T0 is the normal temperature, P0 is standard atmospheric pressure, and delta P is a difference value between the furnace pressure and the receiving tank pressure P1-P2;
step 203, performing multivariate curve fitting on the initial parameter samples through software to obtain a material flow velocity equation:
wherein: k is a material coefficient, k1 is a temperature coefficient, and k2 is a pressure coefficient, and is obtained by curve fitting software;
namely a relational equation between the material flow velocity V of the material flow valve, the weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the temperature T at the top of the blast furnace;
step 204, in actual operation control, gradually correcting values of k, k1 and k2 according to the operation condition to meet the requirement of control precision;
thirdly, formally carrying out automatic control on the material flow valve, sending the collected weight W of the material, the top pressure P1 in the blast furnace, the pressure P2 in the weighing tank and the top temperature T of the blast furnace into the PLC control system by the PLC control system for processing and calculation, and solving a control set value of the material flow speed V according to the speed equation of the material flow valve obtained in the second step;
and step four, the PLC control system adjusts the opening of the material flow valve according to the control set value of the material flow speed V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711460119.7A CN108165690B (en) | 2017-12-28 | 2017-12-28 | Blast furnace flow valve control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711460119.7A CN108165690B (en) | 2017-12-28 | 2017-12-28 | Blast furnace flow valve control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108165690A CN108165690A (en) | 2018-06-15 |
| CN108165690B true CN108165690B (en) | 2020-06-02 |
Family
ID=62519095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711460119.7A Active CN108165690B (en) | 2017-12-28 | 2017-12-28 | Blast furnace flow valve control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108165690B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111235332B (en) * | 2020-01-15 | 2021-10-22 | 江苏省沙钢钢铁研究院有限公司 | Control method and control system for opening of blast furnace material flow valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224708A (en) * | 1984-04-21 | 1985-11-09 | Kawasaki Steel Corp | Method for charging starting material into blast furnace |
| CN102317478A (en) * | 2009-02-11 | 2012-01-11 | 保尔伍斯股份有限公司 | Method and system for adjusting the flow rate of charge material in a charging process of a shaft furnace |
| CN102982218A (en) * | 2012-12-24 | 2013-03-20 | 首钢总公司 | Method for acquiring material flow characteristic at throttling valve on furnace top of blast furnace |
| CN103436648A (en) * | 2013-08-30 | 2013-12-11 | 莱芜钢铁集团有限公司 | Method and device for regulating chute material flow opening during material distribution of blast furnace |
| CN104805242A (en) * | 2015-05-20 | 2015-07-29 | 中冶南方工程技术有限公司 | Self-learning control method of bell-less furnace top material flow regulating valve |
-
2017
- 2017-12-28 CN CN201711460119.7A patent/CN108165690B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224708A (en) * | 1984-04-21 | 1985-11-09 | Kawasaki Steel Corp | Method for charging starting material into blast furnace |
| CN102317478A (en) * | 2009-02-11 | 2012-01-11 | 保尔伍斯股份有限公司 | Method and system for adjusting the flow rate of charge material in a charging process of a shaft furnace |
| CN102982218A (en) * | 2012-12-24 | 2013-03-20 | 首钢总公司 | Method for acquiring material flow characteristic at throttling valve on furnace top of blast furnace |
| CN103436648A (en) * | 2013-08-30 | 2013-12-11 | 莱芜钢铁集团有限公司 | Method and device for regulating chute material flow opening during material distribution of blast furnace |
| CN104805242A (en) * | 2015-05-20 | 2015-07-29 | 中冶南方工程技术有限公司 | Self-learning control method of bell-less furnace top material flow regulating valve |
Non-Patent Citations (2)
| Title |
|---|
| PLC实现高炉料流阀自修正控制的研究与应用;陈明;《信息技术与信息化》;20151231(第3期);第154-155页 * |
| 数字RCV阀的研制及其在高炉料流调节阀上的应用;夏必忠等;《液压气动与密封》;19971231;第32-34页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108165690A (en) | 2018-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111593155B (en) | Blast furnace diagnosis system and method | |
| CN103173584A (en) | Blast furnace burden-distribution control system with self-learning control function | |
| CN108165690B (en) | Blast furnace flow valve control method | |
| CN105219899A (en) | A kind of method for early warning judging Blast Furnace Abnormal Conditions Judgement according to static pressure difference | |
| CN111083968B (en) | Precision seeding device and method for seeding quantity compensation | |
| CN102978311B (en) | Control method for blast furnace closed-loop distributing system | |
| CN101469355B (en) | Bellless furnace top pressure compensation weighing method for blast furnace | |
| CN102156486A (en) | Control method for adding water in mixture in sintering production | |
| CN205324387U (en) | High -pressure forming process on -line measuring system in three -way pipe | |
| CN218380534U (en) | System applied to intelligent combustion control of rotary hearth furnace | |
| JP2022509210A (en) | Methods and systems for controlling raceway depth in blast furnaces | |
| CN106893793A (en) | The monitoring method of real-time coal powder injection rate | |
| CN105467938A (en) | Beer fermentation tank monitoring method based on wireless network | |
| CN202351154U (en) | Air tightness detection device for sintering mixture | |
| CN109491421B (en) | Temperature control method of intelligent temperature control system based on metallurgical secondary resource recycling | |
| CN108453242B (en) | Self-learning-based low-pressure casting pressurization control method and device | |
| CN209210838U (en) | A kind of blast furnace top pressure stabilizing control system | |
| CN206975423U (en) | A kind of temperature control equipment | |
| CN206337294U (en) | A kind of pelletizing disk control system | |
| CN211497405U (en) | Industrial by-product ardealite constant temperature calcination controlling means | |
| CN205974569U (en) | Pressure compensation weighing system based on blast furnace top control process | |
| CN106508728A (en) | Control device for multi-channel temperature control incubator | |
| CN116467835B (en) | Beer fermentation tank monitoring system | |
| CN204824598U (en) | Glass fibre reinforced plastics furnace | |
| CN219434183U (en) | Air flowmeter detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |