CN204779729U - Continuous annealing stove heating section stove temperature control system - Google Patents
Continuous annealing stove heating section stove temperature control system Download PDFInfo
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- CN204779729U CN204779729U CN201520560315.1U CN201520560315U CN204779729U CN 204779729 U CN204779729 U CN 204779729U CN 201520560315 U CN201520560315 U CN 201520560315U CN 204779729 U CN204779729 U CN 204779729U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 94
- 238000000137 annealing Methods 0.000 title claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 96
- 239000010959 steel Substances 0.000 claims abstract description 96
- 238000004519 manufacturing process Methods 0.000 claims abstract description 48
- 238000004886 process control Methods 0.000 claims abstract description 44
- 238000012545 processing Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000002436 steel type Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000007726 management method Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 13
- 238000002791 soaking Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 230000005855 radiation Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012821 model calculation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Abstract
The utility model provides a continuous annealing stove heating section stove temperature control system, the furnace temperature is adjusted in the control of basic automation equipment to last the first operating mode message of the operating mode information in the real -time annealing stove of gathering of field device of sending to process control equipment, production process execution management equipment is obtained belted steel and is added the production line state information in man -hour and generate second operating mode message according to this in the heating section to it sends this second operating mode message to process control equipment to last, process control equipment is received and analytic message, when the deviation that exists between the belted steel effective temperature that operating mode information and production line state information obtained in according to the stove at every turn and the belted steel target temperature of settlement surpasss the settlement scope, thereby all sets for heating section furnace temperature value again and forms the stove and control the message and send and control the furnace temperature for basic automation equipment. The utility model discloses when the belted steel specification varied, the furnace temperature was adjusted in control in time, and the various transform circumstances that can pass through more smoothly make belted steel productivity ratio, lumber recovery improve, save the cost.
Description
Technical Field
The utility model relates to a continuous annealing furnace technique especially relates to continuous annealing furnace heating section furnace temperature control technique.
Background
The heat treatment process of the continuous annealing furnace has high efficiency, and the continuous annealing furnace is used for producing the strip steel with high tensile strength and high plasticity. For the design and manufacture of a continuous annealing furnace unit, the continuous annealing furnace unit is basically imported in China, and according to the development trends of large-scale, product diversification, high quality and low cost of the modern strip steel continuous annealing machine unit, the modeling of the continuous annealing machine unit and the design of a computer automatic control system, particularly the modeling and optimization control of the continuous annealing furnace are technologies to be researched and developed urgently in China. The strip steel continuous annealing furnace has the following characteristics that the continuous annealing furnace is generally divided into a preheating section, a heating section, a soaking section and other sections, the sections are more, the heat transfer characteristics of the sections are almost completely different, and the effective length of the furnace is over long. In addition, the furnace condition is unstable due to frequent changes of the specification, the heat treatment period, the belt travelling speed and the like of the strip steel, and the thermal inertia time of the furnace is far longer than the residence time of the strip steel in the furnace. In summary, the continuous annealing furnace may have furnace temperature disturbance during operation, or the furnace temperature is not suitable for the strip steel when the strip steel is produced on the production line due to the variation of the type, size and the like of the strip steel, and the slight difference of the furnace temperature for the strip steel may cause the quality of the strip steel to be greatly different, so the deviation of the furnace temperature should be monitored and adjusted to produce the strip steel with high quality.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that a continuous annealing furnace heating section furnace temperature control system monitors the operating mode when continuous annealing furnace moves to control the operating mode of belted steel annealing process, when belted steel specification transform, in time control adjusts the furnace temperature, can more steadily pass through various transform circumstances, make belted steel productivity ratio, lumber recovery improve, save the cost.
In order to solve the above problems, the utility model provides a continuous annealing furnace heating section furnace temperature control system, include: basic automation equipment, process control equipment and production process execution management equipment; wherein,
the basic automation equipment is connected with a field device for controlling the working condition in the annealing furnace, receives a furnace control message sent by the process control equipment to control and adjust the furnace temperature, and continuously sends a first working condition message of the working condition information in the annealing furnace, which is acquired by the field device in real time, to the process control equipment;
the production process execution management equipment acquires production line state information of the strip steel during processing in the heating section, generates a second working condition message according to the production line state information, and continuously sends the second working condition message to the process control equipment;
and the process control equipment receives and analyzes the first working condition message and the second working condition message, and resets the furnace temperature value of the heating section and forms a furnace control message to be sent to the basic automation equipment so as to control the furnace temperature each time when the deviation between the actual temperature of the strip steel obtained according to the furnace working condition information and the production line state information and the set target temperature of the strip steel exceeds a set range.
According to the utility model discloses an embodiment, operating mode information includes furnace temperature, production line transfer rate in the stove, furnace pressure, belted steel temperature in the annealing stove.
According to an embodiment of the present invention, the production line status information includes an annealing curve, and a combination of any of the following: strip steel length, strip steel width, strip steel thickness, strip steel density and strip steel type.
According to the utility model discloses an embodiment, basic automation equipment, process control equipment and production process execution management equipment pass through field bus and connect to realize the communication with the ethernet.
According to an embodiment of the invention, the basic automation device controls the furnace temperature by controlling the release of chemical heat of the furnace burner.
After the technical scheme is adopted, the utility model discloses compare prior art and have following beneficial effect: the working condition in the annealing furnace is monitored in real time through basic automation equipment, the working condition information is continuously sent to process control equipment in a message form, production line state information when strip steel is produced on a production line is monitored through production process execution management equipment, the production line state information is continuously sent to the process control equipment in a message form, the process control equipment can monitor the working conditions of the annealing furnace in all working states on one hand, and the condition when the strip steel is produced on the other hand is specially monitored, when the conditions of steel strip, such as steel strip size and the like change, and the deviation between the actual temperature of the strip steel and the set target temperature of the strip steel exceeds a set range, the furnace temperature is controlled through repeated iteration (multiple information interaction between the process control equipment and the basic automation equipment and between production process execution management) so as to continuously reduce the deviation, thereby realizing the smooth transition of the furnace temperature when the strip steel is changed.
Drawings
FIG. 1 is a block diagram of a furnace temperature control system for a heating zone of a continuous annealing furnace according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for controlling the temperature of a heating zone of a continuous annealing furnace according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a heating section of a continuous annealing furnace according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be implemented in many different ways than those herein described and one skilled in the art can do so without departing from the spirit and scope of the present invention, which is not limited to the specific implementations disclosed below.
The continuous annealing furnace of the utility model comprises a preheating section, a heating section and a soaking section.
The preheating section heats the hydrogen-nitrogen mixed protective gas through a heat exchange device by using waste gas generated after combustion in the heating section to carry out heat conduction heating, the protective gas is fully contacted with the strip steel, floating impurities on the surface of the strip steel can be blown off, and the function of heating the strip steel is achieved. The temperature of the strip steel at the outlet of the preheating section can reach 120-150 ℃, and meanwhile, the temperature difference between the first guide roller of the heating section and the strip steel is greatly reduced, so that the deviation correction of the strip steel and the reutilization of energy are facilitated.
The heating section and the soaking section are both heated by radiant tubes, so that the strip steel is not oxidized in the continuous annealing process. The thermal engineering process in the heating section and the soaking section of the continuous annealing furnace includes burning, heat transfer and gas flow inside the furnace. The combustion process is mainly to release the chemical heat in the furnace for the fuel in the burner of the furnace; the heat transfer process is that the chemical heat of the fuel is transferred to the strip steel through radiation of the radiation pipe so as to reach the target temperature required by the strip steel, the heat transfer is mainly carried out in two modes of radiation heat exchange and convection heat exchange, the heat transfer of the heating section is mainly carried out by mainly using the radiation heat exchange and is carried out by secondarily using the convection heat exchange. The strip steel temperature of the soaking section is approximately consistent with the furnace zone temperature, which is also a determining factor for producing different types of strip steel, and the annealing curve issued by the production process execution management device 3 is also a set value for the strip steel temperature of the zone (also a set value for the furnace zone temperature).
The utility model discloses control to the heating zone furnace temperature of continuous annealing stove is to furnace temperature control under the normal annealing condition and furnace temperature control two kinds of circumstances when belted steel attribute changes control. The furnace temperature is controlled to continuously reduce the deviation, so that the furnace temperature can be stably transited when the strip steel is changed. The present invention will be described in detail below.
Referring to fig. 1, in the present embodiment, a continuous annealing furnace heating zone furnace temperature control system includes: a base automation device 1, a process control device 2, and a production process execution management device 3.
Wherein the basic automation device 1 is used as a lower computer to be directly connected with various field devices, such as a transmitter and an actuator, recording instrument, burner etc, basic automation equipment 1 receives stove control message D3 that process control equipment 3 sent and adjusts the annealing stove operating mode (including furnace temperature, belted steel speed, furnace internal pressure etc.) with control, the utility model discloses in especially control be the furnace temperature, basic automation equipment 1 sends field device's characteristic data and the real-time data of gathering to process control equipment 2, in other words, basic automation equipment 1 lasts to the first operating mode message D1 of the interior operating mode information of annealing stove that process control equipment sent field device real-time collection, has contained the interior operating mode information of annealing stove in first operating mode message D1, and the interior operating mode information of annealing stove can include furnace temperature for example, stove production line transfer speed in the stove, furnace pressure, belted steel temperature.
The production process execution management device 3 (which manages only in the production process) acquires the production line state information of the strip steel during processing in the heating section, which may be acquired from a stored database, or may be acquired in other manners, and accordingly generates the second operating condition message D2, and continuously sends the second operating condition message D2 to the process control device 2, where the second operating condition message D2 includes the production line state information, and the production line state information may include, for example, an annealing curve, and a combination of any of the following: strip steel length, strip steel width, strip steel thickness, strip steel density and strip steel type.
The process control device 2 is used as an upper computer, and can use an industrial computer and an HMI (human machine interface) to complete display operation, set calculation, control loop configuration and parameter modification, optimize process processing, and realize real-time monitoring of an annealing process. The process control device is used for receiving and analyzing the first working condition message D1 and the second working condition message D2, when the deviation between the actual temperature of the strip steel and the set target temperature of the strip steel, which are obtained according to the furnace working condition information and the production line state information, exceeds the set range, the furnace temperature value of the heating section is reset and the furnace control message is formed and sent to the basic automation device 1 so as to control the furnace temperature, moreover, the basic automation device 1 and the production process execution management device 3 send the first working condition message D1 and the second working condition message D2 to the process control device 2 continuously, the process control device 2 sends the furnace control message to the production process execution management device 3 continuously, the temperature control of the heating section is used for realizing the temperature, so that the temperature difference between the first working condition message and the expected value is minimum, because the furnace temperature is used for adjusting the temperature, the temperature change needs to be fed back to the process control device 2 to reset the furnace temperature, so that the basic automation device 1, the production process execution management device 3 and the process control device 2 interact for multiple times, and the temperature difference is converged through multiple iterations, so that the proper temperature is adjusted.
Fig. 2 shows a control method of the furnace temperature control system of the heating section of the continuous annealing furnace, and the control system shown in fig. 1 can be adopted to realize the method. The basic automation equipment 1 forms a first working condition message D1 according to the working condition information in the annealing furnace collected by the field device in real time and continuously sends the first working condition message D1 to the process control equipment 2; the production process execution management equipment 3 acquires the production line state information of the strip steel processed in the heating section to form a second working condition message D2 and continuously sends the second working condition message D2 to the process control equipment 2; the method comprises the following steps:
step S1: initializing by the process control equipment according to an annealing curve sent by the production process execution management equipment, giving initial values to furnace temperature values of all parts of the heating section, sending the furnace temperature values to the basic automation equipment by the process control equipment to control the furnace temperature, and entering the step S2;
step S2: the process control device is in a message receiving state, and if receiving the first working condition message and/or the second working condition message, the step S3 is executed;
step S3: the process control equipment carries out effective heat energy calculation according to the strip steel inlet temperature and the strip steel outlet temperature in the working condition information in the annealing furnace, compares an effective heat energy result value with a set target effective heat energy value, if the deviation between the effective heat energy result value and the target effective heat energy value exceeds a set range, the step S4 is carried out, otherwise, the step S2 is carried out;
step S4: and resetting the furnace temperature values of all the subsections of the heating section according to the effective heat energy result value, forming a furnace control message by the process control equipment according to the set furnace temperature value, sending the furnace control message to the basic automation equipment so as to control and adjust the furnace temperature, and returning to the step S2 to reduce the deviation between the effective heat energy result value and the target effective heat energy value in an iterative mode so as to adjust the furnace temperature.
The heating section may be divided into at least three pairs of heating zones, each pair of heating zones being divided into a number of subsections. Referring to fig. 3, in the present embodiment, the heating section is divided into 3 heating zones, wherein the first heating zone is further divided into 5 sections, the second heating zone is divided into 4 sections, and the third heating zone is divided into 3 sections.
The method for setting the furnace temperature value of each subsection of the heating section by the process control device 2 comprises the following steps:
setting the inlet value of the first subsection of the first heating zone to the assignment set by the process control device and the outlet value to its inlet value plus dt; setting an inlet value of a second subsection of the first heating zone to an outlet value of the first subsection of the first heating zone, the outlet value being set to the inlet value of the second subsection plus dt; the subsequent subsections of the first heating zone and so on;
setting the inlet value of the first subsection of the second heating zone as the inlet value of the first subsection of the first heating zone plus the step length of two heating intervals set in the annealing curve, and setting the outlet value as the inlet value plus dt; setting an inlet value of a second subsection of the second heating zone to an outlet value of the first subsection of the second heating zone, the outlet value being set to the inlet value of the second subsection plus dt; the subsequent subsections of the first heating zone and so on;
heating zones subsequent to the second heating zone, and so on;
wherein
to is the strip steel outlet temperature; ti is the strip steel inlet temperature; elements are the sum of the number of divisions of all heating zones.
Specifically, with continued reference to FIG. 2, in step S1, the inlet value of the first subsection of the first heating zone is set to be near room temperature and the outlet value is set to its inlet value plus dt; setting an inlet value of a second subsection of the first heating zone to an outlet value of the first subsection of the first heating zone, the outlet value being set to the inlet value of the second subsection plus dt; the subsequent subsections of the first heating zone and so on; setting the inlet value of the first subsection of the second heating zone as the inlet value of the first subsection of the first heating zone plus the step length of two heating intervals set in the annealing curve, and setting the outlet value as the inlet value plus dt; setting an inlet value of a second subsection of the second heating zone to an outlet value of the first subsection of the second heating zone, the outlet value being set to the inlet value of the second subsection plus dt; the subsequent subsections of the first heating zone and so on; the heating zones following the second heating zone and so on.
In step S2, the process control device 2 enters a message waiting mode, and receives the message as long as the basic automation device 1 and the production process execution management device 3 send the message, and when receiving the second working condition message D2, performs message parsing, determines the production sequence of the steel coil, calculates the expected welding time of the steel coil, and determines whether the production state changes, where the production state refers to whether the attribute of the steel coil changes, and if so, the steel coil target temperature in the steel coil sequence needs to be recalculated, the steel coil is arranged to enter the production line, so that the production according to the specification of the steel coil is facilitated, and the furnace temperature control mode is triggered after the process control device 2 receives any message.
In step S3, the process control device 2 calculates the effective heat energy from the strip inlet temperature and the strip outlet temperature in the annealing furnace condition information by the following formula
Wherein y is the effective heat energy result value, m _ flow is the strip steel flow, enh (to) is the enthalpy at the strip steel outlet temperature to, enh (ti) is the enthalpy at the strip steel inlet temperature ti, STEFAN is the Stefin-Bowman constant, fact is the radiation coefficient, and surf is the radiation area.
If the effective heat energy value can not make the temperature deviation between the actual temperature of the strip steel and the target temperature of the strip steel within a certain range, the furnace temperature value needs to be reset, so that the actual temperature of the strip steel is controlled to be further adjusted, and the deviation range can make the actual conditions definite.
In step S4, the method for resetting the furnace temperature values of the subsections of the heating section according to the effective heat energy result value is that if y<0, tr ═ to, otherwiseWhere tr is the assignment set by the process control device to set the entry value of the first subsection of the first heating zone. Setting the inlet value of the first subsection of the first heating zone to tr and the outlet value to its inlet value plus dt; setting an inlet value of a second subsection of the first heating zone to an outlet value of the first subsection of the first heating zone, the outlet value being set to the inlet value of the second subsection plus dt; the subsequent subsections of the first heating zone and so on; setting the inlet value of the first subsection of the second heating zone as the inlet value of the first subsection of the first heating zone plus the step length of two heating intervals set in the annealing curve, and setting the outlet value as the inlet value plus dt; setting an inlet value of a second subsection of the second heating zone to an outlet value of the first subsection of the second heating zone, the outlet value being set to the inlet value of the second subsection plus dt; the subsequent subsections of the first heating zone and so on; heating after the second heating zoneAnd so on for the zones.
The basic automation device 1 determines the strip steel outlet temperature according to the heat conduction formula of the heating section, the formula is as follows:
wherein TF is the furnace temperature of the heating section, TB is the strip steel temperature, sigma0The strip steel outlet temperature and the strip steel inlet temperature of heat conduction of a heating section are respectively represented by Stefin-Bourman constant, phi is an emissivity coefficient, S is a heat exchange area, v is a conveying speed of a production line in a furnace, t is a strip steel thickness, C is a heat capacity, rho is a strip steel density, and TBE and TBI are respectively represented by a strip steel outlet temperature and a strip steel inlet temperature of heat conduction of a heating section. The heat conduction of the heating section depends on the temperature difference between the strip and the furnace temperature, the thickness, the width, the density and the like, the strip inlet temperature of the heating section, the temperature level difference value in the message sent by the production process execution management device 3 and some speed information.
The heat conduction formula of the soaking section is a linear formula due to the particularity of the heat conduction, as follows:
TFS tbs + b + c lsd + d width, from which the furnace temperature of the soaking section is determined;
wherein: a. and b, c and d model calculation factors, tbs is the length of the strip steel, lsd is the width of the strip steel, and width is the thickness of the strip steel.
The utility model discloses a belted steel self data and the annealing curve requirement that management equipment 3 sent are carried out in production process can calculate corresponding furnace zone temperature setting value to send basic automation equipment 1 with the mode of message through 2 this setting values of process control equipment, carry out closed-loop control by the PID (proportionality differentiation) controller of basic automation equipment 1 again, reach required target. When the data of the steel coil changes, namely the states of the furnace areas before and after the welding seam have to be changed, the steel coil is in smooth transition.
Although the preferred embodiments of the present invention have been described above, it is not intended to limit the scope of the claims, and any person skilled in the art can make possible variations and modifications without departing from the spirit and scope of the present invention.
Claims (5)
1. A continuous annealing furnace heating section furnace temperature control system is characterized by comprising: basic automation equipment, process control equipment and production process execution management equipment; wherein,
the basic automation equipment is connected with a field device for controlling the working condition in the annealing furnace, receives a furnace control message sent by the process control equipment to control and adjust the furnace temperature, and continuously sends a first working condition message of the working condition information in the annealing furnace, which is acquired by the field device in real time, to the process control equipment;
the production process execution management equipment acquires production line state information of the strip steel during processing in the heating section, generates a second working condition message according to the production line state information, and continuously sends the second working condition message to the process control equipment;
and the process control equipment receives and analyzes the first working condition message and the second working condition message, and resets the furnace temperature value of the heating section and forms a furnace control message to be sent to the basic automation equipment so as to control the furnace temperature each time when the deviation between the actual temperature of the strip steel obtained according to the furnace working condition information and the production line state information and the set target temperature of the strip steel exceeds a set range.
2. The continuous annealing furnace heating zone furnace temperature control system of claim 1, wherein the annealing furnace internal condition information comprises furnace temperature, in-furnace line transport speed, furnace pressure, strip temperature.
3. The continuous annealing furnace heating zone furnace temperature control system of claim 1, wherein the line status information comprises an annealing curve, and any combination of: strip steel length, strip steel width, strip steel thickness, strip steel density and strip steel type.
4. The continuous annealing furnace heating zone furnace temperature control system of claim 1, wherein the base automation device, the process control device and the production process execution management device are connected by a field bus and communicate via ethernet.
5. The continuous annealing furnace heating zone furnace temperature control system of claim 1, wherein the basic automation device controls the furnace temperature by controlling the release of chemical heat from the furnace burners.
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| CN201520560315.1U CN204779729U (en) | 2015-07-29 | 2015-07-29 | Continuous annealing stove heating section stove temperature control system |
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| CN201520560315.1U CN204779729U (en) | 2015-07-29 | 2015-07-29 | Continuous annealing stove heating section stove temperature control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962727A (en) * | 2015-07-29 | 2015-10-07 | 上海宝钢节能环保技术有限公司 | Continuous annealing furnace heating section furnace-temperature control system and method |
| CN114480831A (en) * | 2022-02-15 | 2022-05-13 | 宝钢湛江钢铁有限公司 | Automatic control method for strip steel annealing speed |
-
2015
- 2015-07-29 CN CN201520560315.1U patent/CN204779729U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962727A (en) * | 2015-07-29 | 2015-10-07 | 上海宝钢节能环保技术有限公司 | Continuous annealing furnace heating section furnace-temperature control system and method |
| CN114480831A (en) * | 2022-02-15 | 2022-05-13 | 宝钢湛江钢铁有限公司 | Automatic control method for strip steel annealing speed |
| CN114480831B (en) * | 2022-02-15 | 2023-09-22 | 宝钢湛江钢铁有限公司 | Automatic control method for annealing speed of strip steel |
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