TWI647019B - Unplanned delay instant cooling down method for automated heating equipment - Google Patents

Abstract

An immediate non-planar shutdown cooling method for an automated heating device, the method comprising the steps of: a monitoring step, wherein a monitoring system determines whether any of the following conditions is true: the monitoring system receives at least one abnormality from an automated heating device Signal, or the monitoring system receives an immediate cooling signal from a human-machine interface, or the monitoring system monitors that the automated heating device delivers the product for more than one time limit, and if any of the above conditions are met, the monitoring system immediately The automated heating device performs an unplanned shutdown cooling program to cool the preheating zone and a heating zone, and causes the automated heating device to insulate a soaking zone until the monitoring system monitors the automated heating The device is delivered until the product is delivered.

Description

Immediate non-planned shutdown cooling method for automated heating equipment

The present invention relates to a method for equipment shutdown and cooling, and more particularly to an immediate unplanned shutdown and cooling method for an automated heating device.

Referring to FIG. 1 , before the production, the hot-rolled steel mill first heats the production steel embryos into at least one heating furnace in the furnace zone Z1, and the steel embryos sequentially pass through the heating furnace. The preheating zone F1, the heating zone F2 and the soaking zone F3 are heated to different temperatures in a different stage to perform a tapping operation, and the steel manure is extracted from the soaking zone F3 and entered into a hot rolling line for production. For example, it passes through a rough rolling zone Z2, a finishing zone Z3, and a coil zone Z4.

However, the hot rolling line will have irregular production suspensions, such as abnormal production and crushing, product defect equipment inspection, electronic control abnormality or mechanical equipment failure treatment, etc., all of which are unpredictable, or may be It is predicted that one of the unplanned temporary shutdowns within 30 minutes of the shutdown. Wherein, an automatic heating device can automatically detect how long the heating furnace has not performed the tapping operation, and generate an automatic non-planning shutdown state, and the conventional automatic non-planning shutdown state is estimated according to the number of the heating furnaces. After the waiting time has elapsed, the execution begins. For example, according to the number of production furnaces, it is 2 furnaces waiting for 12 minutes, 3 furnaces waiting for 18 minutes, and 4 furnaces waiting for 24 minutes, and then performing the cooling and energy saving function of the furnace.

For example, in the process of entering the furnace into the heating furnace, the movement and the state of the steel in each heating furnace are usually automatically monitored by a program-controlled computer. Because in the normal production process, the timing of the automatic occurrence of the unplanned shutdown state is related to the number of operating furnaces. For example, there are 4 heating furnaces in 1HSM. The normal production rate of general products is about 120 seconds (or less than 120 seconds). The heating furnace extracts a semi-finished product and rolls it into the production plant. In the production of some thin plates (such as the thickness of 1.21 mm), and some high-carbon and other difficult-to-roll products, the production speed is relatively easy to be rolled. (pacing) may slow down to 300 seconds (5 minutes) to produce a piece.

For example, when operating in 4 furnaces, it takes an average of 20 minutes to extract a semi-finished product from the same furnace into the factory. Therefore, the automatic non-planned shutdown state detection time should not be too short, and the time is too short. It has been in an unplanned shutdown state, resulting in insufficient heating temperature of the steel in the heating zone and the preheating zone. Therefore, in the operation of the 4 furnaces, if the same heating furnace is not more than 24 minutes, the unplanned shutdown state is automatically started, and the 3 furnace operation is more than 18 minutes before the unplanned shutdown state is automatically started.

However, in order to maintain normal operation before the time when the unplanned shutdown state is started, the furnace still needs to consume fuel to maintain the heating state in the production process, but the heating amount at this stage is not directly used for production, so A waste of fuel (energy) costs.

In view of this, it is necessary to provide an immediate non-planned shutdown cooling method of the prior automatic heating equipment to solve the problems of the conventional technology.

The main object of the present invention is to provide an immediate non-planned shutdown cooling method for an automated heating device that can immediately perform a cooling program at the beginning of an unplanned shutdown, which does not have to wait until the waiting time for an unplanned shutdown arrives. Execution to reduce energy losses during downtime, thereby reducing energy costs when not used for production.

In order to achieve the above object, the present invention provides an immediate non-planar shutdown cooling method for an automated heating device, which can be applied to an automated heating device for providing heat to at least one heating furnace. Having a preheating zone, a heating zone and a soaking zone in sequence, the method comprises the steps of: a monitoring step, wherein a monitoring system determines whether any of the following conditions is true: the monitoring system receives at least one computer from a program-controlled computer An abnormal signal, or the monitoring system receives an immediate cooling signal from a human-machine interface, or the monitoring system monitors that the automated heating device delivers the product for more than one time limit, and if any of the above conditions are met, the monitoring system immediately Performing an unplanned shutdown cooling program on the automated heating device, causing the automated heating device to cool the preheating zone and the heating zone, and causing the automated heating device to insulate the soaking zone until the monitoring system monitors the The automatic heating device sends the product until the above conditions are not met, the monitoring system continues to carry out the The determination of the determining step.

In an embodiment of the present invention, the non-planned shutdown cooling program can be performed by the supervisor The control system controls a heating amount of the automatic heating device to decrease, so that the automatic heating device lowers a position target temperature of all the steel preforms existing in a preheating zone and a working range in the heating zone, so that the target target temperature is lowered Below an actual calculated temperature. Thereby, the effect of reducing the amount of heating can be achieved.

In an embodiment of the invention, the actual calculated temperature corresponds to a predetermined temperature of the position target, and the monitoring system lowers the predetermined target temperature of the position to control a heating temperature decrease of the automatic heating device until the actual calculation The temperature is lower than the target predetermined temperature of the position.

In an embodiment of the invention, the automated heating device can be a heating furnace automated heating device.

1‧‧‧Monitoring system

2‧‧‧Automatic heating equipment

3‧‧‧Human Machine Interface

4‧‧‧Programming computer

P1~P4‧‧‧ Temperature

P2’‧‧‧ Temperature

P4’‧‧‧ Temperature

F1‧‧‧Preheating zone

F2‧‧‧heating area

F3‧‧‧Hot zone

W‧‧‧ Downtime

W1‧‧‧ Downtime

W2‧‧‧ Downtime

Z1‧‧‧ furnace area

Z2‧‧‧ rough rolling zone

Z3‧‧‧ finishing zone

Z4‧‧‧ coil area

Fig. 1 is a schematic view showing the arrangement of a hot rolling line and a heating furnace control zone of a production plant to which the embodiment of the present invention is applied.

2 is a system block diagram of a non-planned shutdown cooling method of an automated heating device in accordance with an embodiment of the present invention.

Fig. 3a is a schematic view showing the effect of cooling the preheating zone in the embodiment of the present invention.

Figure 3b is a schematic view showing the effect of cooling the heating zone in the embodiment of the present invention.

Figure 3c: Schematic diagram of the effect of heat preservation in the soaking zone in the embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt; Furthermore, the directional terms mentioned in the present invention, such as upper, lower, top, bottom, front, rear, left, right, inner, outer, side, surrounding, central, horizontal, horizontal, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., only refer to the direction of the additional schema. Therefore, the directional terminology used is for the purpose of illustration and understanding of the invention.

Please refer to FIGS. 1 and 2, which are system block diagrams of an immediate non-planar shutdown and cooling method of an automated heating device according to an embodiment of the present invention. The system architecture mainly includes a monitoring system 1 and an automatic heating device 2 (such as a heating furnace automatic heating device) coupled to each other. Moreover, the monitoring system 1 can also be coupled to at least one human-machine interface (HMI) for inputting/outputting data, for example, transmitting an immediate cooling signal, etc., and setting manner thereof belongs to the technical field. Those who have the usual knowledge can understand it, and I won't go into details here. For example, the monitoring system 1 can be used to monitor the working state of the automatic heating device 2, for example, the monitoring system 1 can receive the time when the automatic heating device 2 sends the product, and the monitoring system 1 can also receive Information related to performing a monitoring operation, such as one or more areas generated by a program control computer 4 coupled to the monitoring system 1 (such as the furnace zone Z1, the rough rolling zone Z2, and the finishing zone shown in FIG. 1) Abnormal shutdown conditions of Z3, coil zone Z4, etc., such as: production abnormal rolling treatment, product defect equipment inspection, electronic control abnormality or mechanical equipment failure processing, etc., wherein the program control computer 4 and the automatic heating equipment 2 It can be further integrated, and the setting manner thereof can be understood by those having ordinary knowledge in the technical field, and details are not described herein.

Referring again to FIGS. 1 and 2, the operational flow of the immediate non-planned shutdown and cooling method of the automated heating apparatus of the embodiment of the present invention will be described below. The method can be applied to an automatic heating device 2 for supplying heat to at least one heating furnace. The heating furnace sequentially has a preheating zone F1, a heating zone F2 and a soaking heat. In the area F3, the process of the method may include a monitoring step, which is explained below.

The monitoring step can be judged by a monitoring system 1 as to whether any of the following conditions is met: the monitoring system 1 receives at least one abnormal signal from the programmed computer 4, or the monitoring system 1 receives an immediate cooling signal from a human-machine interface 3. Or the monitoring system 1 monitors that the automatic heating device 2 sends the product for more than one time limit, and if any of the above conditions are met, the monitoring system 1 immediately performs an unplanned shutdown cooling program on the automated heating device 2, The automatic heating device 2 is cooled to the preheating zone F1 and the heating zone F2, and the automatic heating device is insulated from the soaking zone F3 until the monitoring system 1 monitors the automatic heating device 2 to send the product, if the above The conditions are not established, and the monitoring system 1 continues the above determination of the monitoring step.

In an embodiment, the non-planar shutdown cooling program can be controlled by the monitoring system 1 to reduce a heating amount of the automatic heating device 2, so that the automatic heating device 2 has one of the preheating zone F1 and the heating zone F2. The target temperature of all the steel embryos (such as flat steel embryos) present in the working range is lowered, so that the target temperature of the position (such as the position target temperature of a control zone, etc.) is lower than An actual calculated temperature (such as the actual calculated temperature of the control zone, etc.). Thereby, the set temperature of the preheating zone F1 and the heating zone F2 can be lowered, and the fuel consumption of the two zones can be reduced.

In one embodiment, the actual calculated temperature corresponds to a predetermined temperature of the position target, and the monitoring system 1 controls a heating temperature of the automated heating device 2 to decrease until the actual calculated temperature is lower than the predetermined temperature of the position target. The following is an example to illustrate the implementation of the above embodiment in the temperature control operation of the heating furnace, but not limited thereto.

For example, as shown in FIG. 1 , taking four heating operation states as an example, each of the heating states may accommodate up to 50 flat steel embryos of different specifications. During the heating process, the flat steel embryos may be sequentially ordered. Through the preheating zone F1, the heating zone F2 and the soaking zone F3, the flat steel embryos can be gradually heated by the appropriate temperature curve control, and in the heating process, the flat steel embryos can be set at different heating positions. A target temperature is set so that each of the flat steel blanks is at a desired target temperature for each of the flat steel embryos when they reach an exit.

Taking a preheating zone of one of the furnace temperature control operations as an example, since the heating set temperature is automatically controlled by the automatic heating device 2 during the heating process, for example, whether the heating temperature of all the flat steel embryos in the preheating reaches is required The position of the target temperature is determined, and the temperature of the control zone is determined to rise or decrease. The amount of fuel required for the heating amount is higher as the set temperature is higher, and the actual change is automatically increased or decreased according to the measured temperature and the set temperature. This is an automatic heating device for automatic control, which can be arbitrarily changed by human power. In the event of an unplanned downtime (eg, a red signal is illuminated by an error signal transmitted by a programmable computer 4), the monitoring system 1 will automatically heat the automation without hesitation when the abnormal signal is generated. The device 2 immediately executes an unplanned shutdown cooling program, for example, the automatic heating device 2 is controlled by the monitoring system 1 to set a heating temperature decrease for the preheating zone F1 and the heating zone F2 to lower the set temperature, such as: steel The actual calculated temperature of the embryo corresponds to a predetermined temperature of a position target, and the monitoring system 1 can lower the predetermined target temperature of the position (for example, from 230 ° C to 150 ° C), since the heating rate is reduced from 1.0 to 0.5, thus making all The actual calculation temperature of the steel embryo position is higher than the predetermined temperature of the position target, so that the temperature error (Temp error) is a negative value and the set temperature is lowered. When the unplanned shutdown condition is released (if the monitoring system 1 monitors the automatic heating device 2 to deliver the product), the monitoring system 1 can further increase the target target predetermined temperature (eg, the heating rate is increased from 0.5 to 1, the position target) The predetermined temperature is restored to 230 ° C), and the position of the steel blank is compared to actually calculate the temperature and a predetermined temperature of a position target.

Please refer to the figures 3a, 3b and 3c together, which respectively indicate the different temperatures measured in the preheating zone, the heating zone and the soaking zone of a steel state in a non-planned shutdown cooling program. curve. In Figure 3a (that is, the preheating zone), in a shutdown time W, the L2SV preheating zone and the L1SV preheating zone are cooled down to approximately 940 degrees by an immediate unplanned shutdown of 1099 degrees (as indicated by P1). As shown in P2), the temperature of the L1PV preheating zone can be measured to be about 1096.2 degrees (as indicated by P2'), which can be the temperature from the heating zone and the preheating zone to the hot gas recovery zone in the soaking zone. The temperature of the preheating zone is 1096.2 greater than the set temperature 940, and the fuel of the preheating zone can be kept to a minimum; in the 3bth diagram (ie, the heating zone), the time W1 plus W2 is equal to the total downtime W. , W1 is equal to 24 minutes (that is, the immediate non-planned shutdown of this case is compared with the conventional automatic non-planned shutdown to start the non-planned shutdown time), while the L2SV heating zone and the L1SV heating zone are immediately shut down by the planned 1272.7. Degree (as indicated by P3) is cooled to a measurable temperature of 1120 degrees (as indicated by P4), and the temperature measured by the L1PV heating zone is 1250.6 degrees (as indicated by P4'); in Figure 3c (ie, In the soaking zone), in the downtime W, the measurable temperature of the L2SV soaking zone and the L1SV soaking zone begins to slowly cool down and then slowly warms up to maintain Degrees, so that a non-stop program end, billets can be immediately withdrawn from the heating furnace, so that a subsequent production of the materials. Among them, after the end of all the shutdown time W, the preheating zone and the heating zone can indeed start to gradually increase temperature (as shown in Figures 3a and 3b).

Thereby, in the shutdown time W, if the abnormality immediately starts the non-planning shutdown program due to the abnormality, the W1 time can be started earlier, so that the preheating zone and the heating zone can be slowly cooled slowly by lowering the heating set temperature, so as to reduce The required energy (amount of fuel) is heated during the downtime W, and after the downtime W, the original heating rate is used to start the temperature rise to the desired temperature.

In addition, if the operator stops normally at the factory (such as a green indicator light from the abnormal signal), the above-mentioned non-planned shutdown cooling program can be immediately started via the human machine interface 3, for example, the human machine interface 3 can transmit the The cooling signal is immediately cooled to the monitoring system 1 to cause the automatic heating device 2 to immediately cool down.

The non-planar shutdown cooling method of the automatic heating device of the above embodiment of the present invention can directly cool the preheating zone and the heating zone in the heating furnace without changing the hardware of the original automatic heating device, thereby saving the number Ten minutes of fuel consumption can save energy.

In addition, the above-mentioned embodiments of the present invention can automatically execute the above-mentioned non-planar shutdown and cooling program, and can also be on standby for the relevant personnel to perform the above-mentioned non-planar shutdown and cooling program at any time, and can realize the above-mentioned non-operation according to the requirements of the on-site operation. The effectiveness of the planned shutdown and cooling program.

The present invention has been disclosed in its preferred embodiments, and is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

Claims (3)

An immediate non-planar shutdown cooling method for an automatic heating device is applied to an automatic heating device for supplying heat to at least one heating furnace, the heating furnace sequentially having a preheating zone, a heating zone and a soaking zone, the method comprising the steps of: a monitoring step, determining, by a monitoring system, whether any of the following conditions is met: the monitoring system receives at least one abnormal signal from a program-controlled computer, or the monitoring system receives An immediate cooling signal from a human-machine interface, or the monitoring system monitors that the automated heating device delivers the product for more than one time limit, and if any of the above conditions are met, the monitoring system immediately performs an operation on the automated heating device. An exemplary shutdown cooling program, the automatic heating device is cooled to the preheating zone and the heating zone, and the automated heating device is insulated from the soaking zone until the monitoring system monitors the automatic heating device to deliver the product, if the above The conditions are not established, and the monitoring system continues the above judgment of the monitoring step; The planned shutdown and cooling program is controlled by the monitoring system to reduce a heating amount of the automatic heating device, so that the automatic heating device has a position of all the steel embryos existing in the preheating zone and a working range in the heating zone. The target temperature is lowered such that the target temperature at the location is below an actual calculated temperature. An immediate non-planar shutdown cooling method for an automatic heating device according to claim 1, wherein the actual calculated temperature corresponds to a predetermined temperature of a position target, and the monitoring system lowers the target target predetermined temperature to A heating temperature of the automated heating device is controlled to decrease until the actual calculated temperature is below the target target predetermined temperature. An immediate non-planar shutdown cooling method for an automated heating device as described in claim 1, wherein the automated heating device is a heating furnace automatic heating device.