CN108929945B - Energy-saving method for heat treatment furnace - Google Patents
Energy-saving method for heat treatment furnace Download PDFInfo
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- CN108929945B CN108929945B CN201710386776.5A CN201710386776A CN108929945B CN 108929945 B CN108929945 B CN 108929945B CN 201710386776 A CN201710386776 A CN 201710386776A CN 108929945 B CN108929945 B CN 108929945B
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- C21—METALLURGY OF IRON
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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Abstract
The invention discloses an energy-saving method for a heat treatment furnace, which comprises the following steps: uniformly dividing the heat treatment furnace into a plurality of sub-furnace zones along the length direction of the heat treatment furnace; determining whether each sub-furnace zone is a vacant zone or not according to the number and the positions of the steel plates to be processed in the heat treatment furnace; and acquiring the maximum furnace area energy-saving temperature of the heat treatment furnace, and determining the cooling temperature of each empty area according to the maximum furnace area energy-saving temperature. The energy-saving method of the heat treatment furnace can predict the empty zone condition in the heat treatment furnace according to the real-time position of the steel plate, thereby realizing the dynamic adjustment of the furnace temperature, reducing the consumption of gas media and playing the roles of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to an energy-saving method for a heat treatment furnace.
Background
The heat treatment is a necessary means for producing high value-added steel plates with important applications such as low-temperature pressure vessel plates, power plant boiler plates, wear-resistant steel plates and the like. The computer system of the heat treatment furnace can be generally divided into a production management computer, a process control computer and a lower computer from top to bottom, and the production management computer, the process control computer and the lower computer are respectively responsible for production planning, production process control and basic automation. The heat treatment furnace is used for heating steel plates, the furnace temperature is automatically controlled by adopting a process computer system comprising a mathematical model, and meanwhile, the running speed of a roller way is controlled by adopting a PLC (programmable logic controller) to meet the time required by heating, so that the heat treatment furnace is a core device for heat treatment and has higher requirements on temperature and time control accuracy.
In actual production, the furnace temperature is usually set by the computer system based on a reference furnace temperature curve regardless of whether or not there is a steel sheet in the furnace or whether or not there is a steel sheet in a certain region in the furnace. Since the furnace temperature is not set according to actual conditions, the heat treatment furnace is prone to cause energy waste and equipment loss.
Currently, a series of improvements have been made in the prior art to the energy saving problem of heat treatment furnaces, including:
an energy-saving optimization control system for an industrial heat treatment furnace disclosed in Chinese patent CN201120137566.0 comprises: and sensing signals of the parameter detection and data acquisition module are transmitted to the real-time intelligent controller through the A/D data conversion module, and the real-time intelligent controller and the upper computer exchange data through the RS485 communication module and the RS 485-to-RS 232 converter. The upper computer analyzes and processes the collected various state data of the industrial heat treatment furnace, realizes the early warning and diagnosis of various faults of the industrial heat treatment furnace and the real-time display of the running state, and has the function of statistical analysis of various data. The patent realizes the perception and control of the state in the furnace through a data acquisition module, and belongs to the optimization of control hardware.
A temperature-controlled energy-saving continuous heating furnace for heat treatment disclosed in chinese patent CN201220535394.7, comprising: two burners in each pair of burners are arranged in a hearth in a vertically staggered manner with the roller rods and are respectively installed on two side walls of the hearth, and the connecting end of each burner, which extends out of the outer wall of the hearth, is communicated with a combustion-supporting gas pipe and a natural gas pipe which are installed on the furnace body. The heat exchanger is respectively provided with a hot air pipe and a smoke exhaust pipe, the hot air pipe on the heat exchanger is arranged in the preheating section of the hearth, and the smoke exhaust pipe on the heat exchanger is arranged in the heat preservation section of the hearth. The heat exchanger, the combustor, the pressure sensor, the temperature sensor and the speed reducing motor in the roller conveyor are communicated with the controller through connecting wires. The patent realizes the purpose of energy conservation by improving the furnace body.
A novel energy-saving continuous normalizing heat treatment furnace disclosed in Chinese patent CN201210205866.7 relates to a novel energy-saving continuous normalizing heat treatment furnace, which comprises a preheating zone, a heating zone, a heat preservation zone, an isothermal zone and a slow cooling zone, wherein the tail end of the preheating zone, the head end and the tail end of the heating zone and the head end of the heat preservation zone are sequentially connected to form a first heat treatment section with the preheating zone, the heating zone and the heat preservation zone, the tail end of the isothermal zone is connected with the head end of the slow cooling zone to form a second heat treatment section with the isothermal zone and the slow cooling zone, the second heat treatment section is arranged side by side with the first heat treatment section, the preheating zone is communicated with the slow cooling zone, the tail end of the slow cooling zone is connected with a recovery device for accommodating air at the tail end of the slow cooling zone, the recovery device is provided with an air leading-in device for injecting air in the recovery device into the isothermal zone, the tail end of the heat preservation zone is connected with, thereby effectively utilizing the temperature in the furnace and realizing the purpose of high efficiency and energy saving.
However, in the above-mentioned conventional techniques, the energy saving control of the heat treatment furnace in the empty space state is not performed depending on the actual state of the inside of the heat treatment furnace, that is, whether or not there is a steel sheet in the furnace or whether or not there is a steel sheet in a certain region inside the furnace.
Aiming at the problem that the prior art does not perform energy-saving control on the heat treatment furnace in the empty area state, the invention provides an energy-saving method of the heat treatment furnace, which can predict the empty area condition in the heat treatment furnace and adjust the temperature according to the empty area condition.
Disclosure of Invention
In order to solve the problems, the invention provides an energy-saving method for a heat treatment furnace, which can predict the empty zone condition in the heat treatment furnace according to the real-time position of a steel plate, thereby realizing the dynamic adjustment of the furnace temperature, reducing the consumption of a fuel gas medium and playing the roles of energy conservation and emission reduction.
In order to achieve the aim, the invention provides an energy-saving method of a heat treatment furnace, which comprises the following steps:
s1, uniformly dividing the heat treatment furnace into a plurality of sub-furnace zones along the length direction of the heat treatment furnace;
s2, determining whether each sub-furnace zone is a vacant zone or not according to the number and the positions of the steel plates to be processed in the heat treatment furnace;
and S3, acquiring the maximum furnace area energy-saving temperature of the heat treatment furnace, and determining the cooling temperature of each empty area according to the maximum furnace area energy-saving temperature.
Further, the heat treatment furnace includes a furnace charging zone, an energy saving zone, and a heat retaining zone, and in step S2, a plurality of sub-furnace zones located in the energy saving zone of the heat treatment furnace are selected, and it is determined whether the plurality of sub-furnace zones are vacant zones.
Further, in step S2, when there is no steel plate to be processed in any two or more consecutive sub-furnace zones outside the sub-furnace zone adjacent to any steel plate to be processed in the energy-saving zone, the consecutive sub-furnace zones are determined to be empty zones respectively.
Further, the specific method for determining the cooling temperature of each empty zone comprises the following steps:
s3.1, determining the maximum temperature reduction of the empty area according to the temperature rising slope of the heat treatment furnace and the moving speed of the steel plate to be treated in the heat treatment furnace;
and S3.2, acquiring the maximum furnace area energy-saving temperature of the heat treatment furnace, and taking the smaller value of the maximum degradable temperature and the maximum furnace area energy-saving temperature as the temperature reduction temperature of the vacant area.
Further, the moving speed of the steel plate to be processed in the heat treatment furnace is determined according to the temperature rising slope of the heat treatment furnace and the target heat preservation temperature of the steel plate to be processed.
Further, according to the position of the steel plate to be processed which is about to reach the vacant area and the moving speed of the steel plate in the heat treatment furnace, the time interval of the steel plate to be processed reaching the vacant area is determined, and according to the time interval and the temperature rising slope of the heat treatment furnace, the maximum temperature which can be reduced in the vacant area is determined.
Further, the method also comprises the step of updating the temperature of the empty areas in real time according to the original temperature of each empty area and the cooling temperature of the empty area.
Further, when no steel plate to be processed exists in all the sub-furnace areas, the heat treatment furnace is in a full-empty-area state, and all furnace areas of the heat treatment furnace are cooled according to the maximum furnace area energy-saving temperature.
Further, when the processing task is obtained, determining the temperature rise temperature of the heat treatment furnace according to the temperature drop temperature of the heat treatment furnace, the steel plate heating curve, the temperature rise slope of the heat treatment furnace and the furnace entering time of the steel plate to be processed.
The energy-saving method for the heat treatment furnace can predict the empty area condition in the heat treatment furnace under the conditions of production change rule, heat treatment mode switching, failure of a previous process and the like according to the real-time position of the steel plate on the premise of not changing the existing equipment and not influencing the production quality and the production progress, thereby carrying out temperature rise and fall control on the empty area, realizing dynamic adjustment on the furnace temperature, reducing the consumption of a gas medium and playing a role in energy conservation and emission reduction with good effect. The energy-saving method of the heat treatment furnace can reduce the production cost because the existing equipment is not changed.
Drawings
FIG. 1 is a sectional view of a sub-furnace section of a heat treatment furnace;
FIG. 2 is a temperature rise profile of the heat treatment furnace shown in FIG. 1;
FIG. 3 is a flow chart of an energy-saving method of a heat treatment furnace according to the present invention;
FIG. 4 is a schematic view showing a state in which a partially empty area is present in the heat treatment furnace shown in FIG. 1;
FIG. 5 is a schematic view showing a fully empty state of the heat treatment furnace shown in FIG. 1;
FIG. 6 is a flowchart of a gob prediction in the energy saving method of the heat treatment furnace of the present invention;
FIG. 7 is a temperature drop profile of the furnace of FIG. 1 with partial empty zones;
FIG. 8 is a temperature drop profile of the heat treatment furnace shown in FIG. 1 with empty space;
FIG. 9 is a schematic diagram illustrating the temperature of the cooled down portion of one embodiment of the present invention in comparison with the prior art;
FIG. 10 is a schematic diagram showing a comparison of the temperature after cooling according to another embodiment of the present invention with that of the prior art;
FIG. 11 is a comparison of the temperature after cooling according to another embodiment of the present invention and the prior art.
Detailed Description
The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, according to the heat treatment production experience, the heat treatment furnace 10 can be divided into a furnace charging area a, an energy-saving area b and a heat preservation area c, due to the requirement of the rapid furnace charging process, when the steel plate 20 to be treated enters the furnace, several furnace areas related to the length range of the steel plate 20 to be treated are called as the furnace charging area a, and when the rapid furnace charging operation is performed on the steel plate 20 to be treated, the furnace temperature of the area is rapidly changed, so that the energy-saving control is not suitable to be performed on the steel plate 20 to be treated; the last part of the smooth furnace temperature belongs to a heat preservation area c, which is used for ensuring the consistency of the plate temperature of the steel plate 20 to be processed and the stability of material components, and for the part, the furnace temperature of the area is generally not suitable to be interfered; in summary, the region where the energy saving control is suitably performed is the energy saving region b in the middle portion of the heat treatment furnace. The temperature rise curve of the heat treatment furnace 10 shown in FIG. 1 is shown in FIG. 2. Wherein the abscissa represents the position from the inlet to the outlet of the heat treatment furnace 10, the ordinate represents the temperature, curve a is a conventional set furnace temperature curve which is originally set optimally and represents the operating temperature of the corresponding position in the heat treatment furnace 1, and curve B is a sheet temperature curve and represents the temperature of the steel sheet 20 to be processed when the steel sheet moves to the corresponding position in the heat treatment furnace 10.
As shown in fig. 3, the present invention provides an energy saving method for a heat treatment furnace, comprising the steps of:
the first step is to divide the heat treatment furnace 10 into a plurality of sub-furnace sections uniformly along the length direction of the heat treatment furnace 10.
There are various methods for dividing the sub-furnace sections, and the heat treatment furnace 10 may be divided into a fixed number of sub-furnace sections according to the length of the heat treatment furnace 10, or may be divided into sub-furnace sections according to the length of the steel sheet 20 to be treated, etc., and the heat treatment furnace 10 is generally divided into 10-12 sub-furnace sections with equal length. The division of the molecular furnace zone may be performed in various ways, and the molecular furnace zone may be divided only along the length direction of the heat treatment furnace 10, or may be divided up and down after being divided along the length direction of the heat treatment furnace 10, and finally each small unit is a sub-furnace zone.
In the embodiment of the present invention, the sub-furnace zone is divided along the length direction of the heat treatment furnace 10, and the sub-furnace zone divides the heat treatment furnace 10 into 12 sub-furnace zones, namely, sub-furnace zone 1 and sub-furnace zone 2 … … sub-furnace zone 12, according to the length of the steel sheet 20 to be treated.
And a second step of determining whether each sub-furnace zone is a vacant zone according to the number and position of the steel plates 20 to be processed in the heat treatment furnace 10.
In actual production, as the furnace temperature needs to rise and fall for a period of time, aiming at the change of different steel types and specifications in a plan, the continuous furnace entering operation of the steel plates 20 to be treated is artificially suspended, and a dead zone phenomenon is generated in the heat treatment furnace 10; the operation of the whole empty area is necessary when the heat treatment process mode is switched, and the operation is used for adjusting the furnace temperature, so that the furnace temperature caused by the simultaneous feeding of the steel plates 3 to be treated with different requirements is prevented from meeting the process target; production fluctuations, such as malfunctions in previous processes, production stock, etc., also cause dead space.
In the embodiment of the invention, two forms of empty zone conditions are provided. In order to perform energy saving control only on the sub-furnace zone in the energy saving zone b, a plurality of sub-furnace zones, such as sub-furnace zones 4-9, located in the energy saving zone b of the heat treatment furnace 10 are selected, and it is determined whether the plurality of sub-furnace zones are empty zones, where the empty zones may also be referred to as partial empty zone states, as shown in fig. 4, the specific method is as follows: when no steel plate 20 to be processed exists in any more than two continuous sub-furnace areas except the sub-furnace area 7 adjacent to any steel plate 20 to be processed in the energy-saving area b, the continuous sub-furnace areas 4-6 are determined to be empty areas respectively, and temperature control is performed on the empty areas, so that energy saving of the heat treatment furnace 10 is realized. Another is to perform energy-saving control on the whole heat treatment furnace 10, when there is no steel plate to be treated in all the sub-furnace sections 1 to 12, the heat treatment furnace 10 is in a full-empty-zone state, as shown in fig. 5, the temperature of the whole heat treatment furnace 10 is controlled, thereby realizing energy saving of the heat treatment furnace 10.
According to the embodiment of the present invention, as shown in fig. 6, the method for determining the empty area condition may specifically be:
determining the information of the steel plate in the heat treatment furnace 10 according to the tracking information of the steel plate 20 to be treated;
if the number of the steel plates 20 to be processed is equal to 0, setting the zone bit of the empty zone of the whole furnace zone to be 1;
if the number of the steel plates 20 to be processed is not 0, determining the number and the positions of the steel plates 20 to be processed in the energy-saving area b according to the length and the position information of the steel plates 20 to be processed, and judging whether empty areas exist outside two adjacent areas of the front and the back of the steel plates 20 to be processed; and setting the corresponding empty zone flag position as 1 for cooling control.
And a third step of obtaining the maximum furnace area energy-saving temperature of the heat treatment furnace 10 and determining the cooling temperature of each empty area according to the maximum furnace area energy-saving temperature.
In an embodiment of the present invention, a specific method for determining a cooling temperature of each empty zone of the heat treatment furnace 10 in a partially empty zone state includes:
1. the maximum temperature reduction of the empty zone is determined according to the temperature rising slope of the heat treatment furnace 10 and the moving speed of the steel plate 20 to be treated in the heat treatment furnace 10.
In the embodiment of the present invention, the moving speed of the steel sheet to be processed 20 in the heat treatment furnace 10 may be determined according to the temperature rising slope of the heat treatment furnace 10 and the target holding temperature of the steel sheet to be processed 3. Further, the time interval for the steel plate 20 to be processed to reach the empty zone is determined according to the position of the steel plate 20 to be processed which is about to reach the empty zone and the moving speed thereof in the heat treatment furnace 10, and the maximum drawable temperature of the empty zone is determined according to the time interval and the temperature rising slope of the heat treatment furnace 10.
The calculation formula of the moving speed of the steel plate is as follows:
tactual performance heating＝tTheoretical heating*dSteel plate+tHeat preservation；
VSteel plate＝(LFurnace with a heat exchanger–LSteel plate)*60/(1000*tActual performance heating)；
In the formula, tActual performance heatingHeating time(s), t) of the steel plate in the furnaceTheoretical heatingIs the theoretical unit heating time(s), d of the steel plateSteel plateIs the thickness (mm) of the steel plate, tHeat preservationTarget holding time(s), V for the steel plateSteel plateThe moving speed (m/min) of the steel plate in the furnace, LFurnace with a heat exchangerIs furnace length (mm), LSteel plateIs the length (mm) of the steel plate.
Specifically, when the empty zone in the heat treatment furnace 10 is determined, the serial number corresponding to the empty zone is already determined, so that the position of the empty zone can be determined according to the serial number, the remaining time of the steel plate 20 to be treated reaching the empty zone can be calculated according to the speed of the steel plate 20 to be treated, and the maximum temperature drop can be calculated according to the temperature rise slope.
Further, the method for calculating the remaining time of the empty zone comprises the following steps: and calculating the remaining time of the vacant area according to the moving speed of the steel plate 20 to be processed, and predicting the time for the steel plate 20 to be processed to enter and leave a certain furnace area. When the target steel plate to be processed 20 does not have a steel plate to be processed 20 entering the furnace, a production plan or a feeding event, the calculated empty area remaining time is a negative value, and an absolute value is taken as the empty area remaining time.
Wherein, the calculation formula of the residual time of the empty zone is as follows: t is tRemainder of＝DFurnace tail/VPractice ofIn the formula, tRemainder ofFor the remaining time(s), D of the empty zoneFurnace tailIs the distance V between the steel plate and the tail part of the furnace zonePractice ofIs the actual speed of the steel plate. The maximum drawdown temperature is calculated by the formula: t isCan be maximally reduced＝K*ABS(tRemainder of) In the formula, TCan be maximally reducedTo maximum drawdown temperature, K: the temperature-rise gradient constant of the heat treatment furnace in the present embodiment can be set to 100 ℃/h.
The temperature-increasing slope is determined according to the distribution number and power of the radiant tubes in each sub-furnace zone of the heat treatment furnace 10, the number can also be referred to as the maximum temperature-increasing capacity of the heat treatment furnace 10, the unit is ℃/h, the maximum temperature-increasing capacity of the radiant tubes is generally 100 ℃/h, the temperature-increasing slope can be adjusted according to specific furnace types, and the temperature-increasing slope of the heat treatment furnace 10 can be changed according to different types and numbers of the radiant tubes adopted by different furnace types.
2. The maximum furnace zone energy-saving temperature of the heat treatment furnace 10 is obtained, and the smaller value of the maximum degradable temperature and the maximum furnace zone energy-saving temperature is taken as the temperature reduction temperature of the vacant zone.
In the embodiment of the invention, the maximum furnace area energy-saving temperature can be set as a constant according to the empirical value of actual heat treatment production, and the value range is 22-27 ℃. Of course, the adjustment can be carried out according to different furnace types according to different situations. When the maximum temperature-reducible temperature is not more than the maximum furnace zone energy-saving temperature, enough time is provided for raising the furnace temperature back to the original set furnace temperature before the steel plate 20 to be processed reaches the target furnace zone. Then, the temperature of the empty area can be updated in real time according to the original temperature of each empty area and the cooling temperature of the empty area.
In this embodiment, after the maximum temperature drop is calculated, the maximum furnace area energy saving temperature and the maximum temperature drop in the parameter table are compared by the minimum function, and a smaller value is taken as the temperature drop of the empty area.
Wherein the minimum function is TCan actually decrease＝min(TCan be maximally reduced，TFurnace zone energy saving) In the formula, TCan actually decreaseIs the temperature drop of the dead zone, TFurnace zone energy savingThe energy-saving temperature of the maximum furnace area is obtained.
And finally, transmitting the temperature reduction temperature of the empty area to a controller, subtracting the temperature reduction temperature of the empty area on the basis of the conventional set temperature which is set in an optimized mode, and then resetting the furnace temperature. The calculation formula is as follows: t isSetting up＝TGeneral of-TCan actually decreaseIn the formula, TSetting upSetting furnace temperature, T, for reset energy savingsGeneral ofThe furnace temperature is set conventionally.
In the embodiment of the present invention, when the heat treatment furnace 10 is in the partially empty zone state, since the empty zone remaining time t has been calculatedRemainder ofTherefore, as the steel sheet 20 to be processed is closer to the empty space in energy saving, TCan actually decreaseThe cooling range of (2) is smoothly reduced, and when the steel plate 20 to be processed reaches the empty area, the furnace temperature already meets the requirement of heating the steel plate 20 to be processed, and extra heating is not needed. Thus, the heat treatment temperature curve after the temperature of the empty zone of the heat treatment furnace 10 is reduced is shown in fig. 7, in which the abscissa indicates the position in the direction from the inlet to the outlet of the heat treatment furnace 10, the ordinate indicates the temperature, curve a is a conventionally set furnace temperature curve that has been optimally set as it is, curve a' is a furnace temperature that has been reset after energy saving, and curve B is a plate temperature curve representing the temperature of the steel plate 20 to be treated when it has moved to the position corresponding to the heat treatment furnace 10. It can be seen that there is a significant drop in temperature at the location of fig. 7 corresponding to the vacant section of fig. 4.
In another embodiment of the present invention, for the heat treatment furnace 10 in the partially empty zone state, the entire furnace zone of the heat treatment furnace 10 is cooled according to the maximum furnace zone energy saving temperature.
At this time, whether the adjustment of the temperature increasing process is performed or not can be judged according to the history plan and the unfinished plan of the heat treatment of the steel plate to be treated, if so, the adjustment is finished, if not, whether the steel plate to be treated is fed is judged, and if not, the whole heat treatment furnace is excited to perform the temperature reduction control. And setting an additional cooling value of each furnace zone according to the determined maximum furnace zone energy-saving temperature, sending the additional cooling value to the controller, correcting the furnace temperature setting curve, and reducing the original optimally set furnace temperature of the whole heat treatment furnace 10. The calculation formula is as follows: t isSetting up＝TGeneral of-TFurnace zone energy savingIn the formula, TSetting upSetting furnace temperature, T, for reset energy savingsGeneral ofThe furnace temperature is set conventionally. Thus, the heat treatment temperature curve after the entire heat treatment furnace 10 is cooled is shown in fig. 8, in which the abscissa indicates the position in the direction from the inlet to the outlet of the heat treatment furnace 10, the ordinate indicates the temperature, curve a is the furnace temperature curve that was originally optimally set, and a' is the energy-saving set furnace temperature curve that was reset after energy saving. It can be seen that the overall temperature of the heat treatment furnace 10 is decreased.
In another embodiment of the present invention, when a processing task is obtained, that is, when there is a steel sheet 20 to be processed about to be loaded, the temperature of the heat treatment furnace 10 may be determined according to the temperature of the heat treatment furnace 10, the heating curve of the steel sheet, the temperature increase slope of the heat treatment furnace 10, and the time of loading the steel sheet 20 to be processed.
The method is mainly used for monitoring the production recovery condition after cooling and energy saving when the heat treatment furnace is in a full-empty-zone state, and ensures that the furnace temperature can be timely recovered to the original target value when the production is started. In the embodiment of the invention, because there may or may not be the remaining steel plate treatment plan in the full-empty area, if there is no remaining steel plate treatment plan, the operation needs to issue a new steel plate treatment plan on the production management computer terminal first when resuming production; and if so, producing the rest steel plate treatment plan, and directly commanding the traveling crane to lift the relevant steel plate to be treated to the feeding roller way. According to the normal production operation flow, when there is no steel plate processing plan left, the furnace entry time + plan confirmation time + generation of a crane command + steel plate hanging to the entry roller time + furnace front confirmation time + furnace entry operation time ≧ 10 minutes, generally, 10 minutes. If the steel plate loading event sent by the lower computer is received, the furnace entering time is the confirmation time before the furnace plus the furnace entering operation time is more than or equal to 5 minutes, as shown in table 1.
TABLE 1 comparison table of the charging time of steel plates to be treated
| Steel plate processing information in full empty area | Plan validation | Time of entering furnace |
| There is a surplus steel plate treatment plan | Does not need to use | 5 minutes |
| No steel plate treatment plan | Need to make sure that | 10 minutes |
According to the furnace entering time, a calculation formula for obtaining the residual time of the empty zone is as follows: t is tArrive at＝tInto the furnace+VCharging furnace/LInto the furnace+VSteel plate/DInto the furnace，tArrive atThe moment when the steel plate reaches the current furnace zone, tInto the furnaceFor the time of charging, VCharging furnaceCharging speed L of steel plate to be processed uploaded by PLCInto the furnaceFor length of furnace zone, VSteel plateFor the speed of movement of the steel sheet to be treated, DInto the furnaceThe distance between the current furnace zone and the furnace entering zone.
The PLC raises the temperature of the heat treatment furnace in advance according to the remaining time of the dead zone, the current cooling temperature, the steel plate heating curve and the heating capacity of the radiant tube, so that the furnace temperature setting curve is corrected, and the furnace temperature of the steel plate when entering the furnace is ensured to meet the requirements.
Specifically, the maximum upgradeable temperature T is first calculatedMaximum upgradeable＝K*tArrive atIn the formula, TMaximum upgradeableIs the maximum temperature that can be raised. Then according to the formula TTemperature rise setting＝min((TTarget furnace temperature-TActual furnace temperature)，TMaximum upgradeable) ComputingOut of the actual temperature rise, wherein TTemperature rise settingTo the actual temperature rise, TTarget furnace temperatureFor the target temperature, T, of the furnace zone calculated from a reference heating curveActual furnace temperatureIs the current actual furnace temperature of the furnace zone.
According to an embodiment of the present invention, when the heat treatment furnace is in the empty zone state, the energy saving temperature curve is shown in fig. 9, wherein the abscissa represents the position from the inlet to the outlet of the heat treatment furnace, the ordinate represents the temperature, curve a is the conventional set furnace temperature curve that was originally set optimally, and a' is the energy saving set furnace temperature curve that was reset after energy saving, and the results shown in table 2 can be obtained by using the energy saving method of the present invention. It can be seen that the energy-saving set furnace temperature is 24 ℃ lower than the conventional set furnace temperature, and the good energy-saving and temperature-reducing effects are achieved.
TABLE 2 COMPARATIVE TABLE FOR FULL-ASPECT STATUS ENERGY-SAVING STOVE temp
According to another embodiment of the present invention, when the heat treatment furnace is in a partially empty zone state and a single steel plate to be treated is located at the front of the heat treatment furnace, at this time, the thickness of the steel plate to be treated is 10mm, the length is 3m, the target holding temperature is 930 ℃, and the steel plate travels up to 26.1 meters (travels to the sub-furnace zone 4). The results shown in Table 3 were obtained by the energy-saving method of the heat treatment furnace of the present invention.
TABLE 3 temperature comparison table for energy-saving furnace in partial empty zone state of only one steel plate in furnace
Taking the sub-furnace zone 6 shown in table 3 as an example, the calculation process is as follows:
the distance between the target sub-furnace zone and the target sub-furnace zone is equal to the end coordinate of the sub-furnace zone, and the current steel plate position is equal to 42-26.1 and equal to 15.9 m;
the remaining time to reach each sub-furnace zone is 15.9/5.5 × 60 ═ 173.45 sec;
the maximum temperature drop (radiant tube maximum heating capacity/3600) and the remaining time to reach each sub-furnace zone (100/3600) 173.45-4.82 ℃, wherein the division by 3600 is used for the unit conversion of hours and seconds;
the temperature reduction temperature is min (the maximum temperature can be reduced, and the energy-saving temperature of the maximum furnace area) is min (4.82,24) is 4.82 ℃;
the energy-saving set furnace temperature is 906.98-4.82-902.16 ℃ as the conventional set furnace temperature-cooling temperature.
As described above, the steel sheet to be processed is located in the sub-furnace zone 4, no steel sheet to be processed exists in front of and behind the sub-furnace zone, the sub-furnace zone 1-2 starts the energy saving control of the whole furnace zone, the sub-furnace zone 6-9 starts the energy saving control of a part of furnace zones, and the energy saving temperature curve is shown in fig. 10, wherein the abscissa represents the position from the inlet to the outlet of the heat treatment furnace, the ordinate represents the temperature, the curve a is the conventional set furnace temperature curve which is originally set in an optimized manner, and a' is the energy saving set furnace temperature curve which is reset after energy saving. It can be seen that the temperatures of the sub-furnace areas 5-10 are all reduced, and a good energy-saving and cooling effect is achieved.
According to another embodiment of the invention, when the heat treatment furnace is in a partial empty area state and a plurality of steel plates to be treated are positioned at the front part of the heat treatment furnace, at this time, the thickness of the first steel plate to be treated is 15mm and the length thereof is 23m, the target holding temperature is 930 ℃, the steel plate travels to 5.5 meters (travels to the sub-furnace area 1), the thickness of the second steel plate to be treated is 10mm and the length thereof is 3m, the target holding temperature is 930 ℃, and the steel plate is positioned in the holding area. The results shown in Table 4 were obtained by the energy-saving method of the heat treatment furnace of the present invention.
TABLE 4 ENERGY-SAVING STOVE temp. COMPARATIVE TABLE FOR PARTIAL STATE OF BUILT-IN MULTI-STEEL PLATE
Taking the sub-furnace zone 6 shown in table 3 as an example, the calculation process is as follows:
the distance between the target sub-furnace area and the target sub-furnace area is equal to the end coordinate of the sub-furnace area, and the current steel plate position is equal to 42-5.5-36.50 m;
the remaining time to reach each sub-furnace zone is 36.50/4.9 × 60 ═ 446.94 sec;
the maximum temperature drop (radiant tube maximum heating capacity/3600) and the remaining time to reach each sub-furnace zone (100/3600) 446.94-12.41 ℃, wherein the division by 3600 is used for the unit conversion of hours and seconds;
the temperature reduction temperature is min (the maximum temperature can be reduced, and the energy-saving temperature of the maximum furnace area) is min (12.41,24) is 12.41 ℃;
the energy-saving set furnace temperature is 906.98-12.41-894.57 ℃ as the conventional set furnace temperature-cooling temperature.
As shown in the above table, the steel plates to be processed are respectively located in the sub-furnace zone 1 and the sub-furnace zone 10, no steel plate to be processed exists in front of and behind the sub-furnace zone, the sub-furnace zone 3 belongs to the furnace entering zone, the energy-saving control of part of the furnace zone is started in the sub-furnace zones 4-8, and the energy-saving temperature curve is shown in FIG. 11, wherein the abscissa represents the position from the inlet to the outlet of the heat treatment furnace, the ordinate represents the temperature, the curve A is the conventional set furnace temperature curve which is originally optimized and set, and A' is the energy-saving set furnace temperature curve which is reset after energy. It can be seen that the temperatures of the sub-furnace areas 5-7 are all reduced, and a good energy-saving and temperature-reducing effect is achieved.
In conclusion, the energy-saving method of the heat treatment furnace can predict the empty area condition in the heat treatment furnace according to the real-time position of the steel plate, thereby realizing the dynamic adjustment of the furnace temperature, reducing the consumption of gas media and playing the roles of energy conservation and emission reduction.
The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.
Claims (7)
1. An energy-saving method for a heat treatment furnace is characterized by comprising the following steps:
s1, uniformly dividing the heat treatment furnace into a plurality of sub-furnace zones along the length direction of the heat treatment furnace;
s2, determining whether each sub-furnace zone is a vacant zone according to the number and the positions of the steel plates to be processed in the heat treatment furnace;
s3, obtaining the maximum furnace area energy-saving temperature of the heat treatment furnace, and determining the cooling temperature of each empty area according to the maximum furnace area energy-saving temperature;
the heat treatment furnace comprises a furnace charging area, an energy-saving area and a heat preservation area, and in the step S2, a plurality of sub-furnace areas located in the energy-saving area of the heat treatment furnace are selected and whether the sub-furnace areas are empty areas or not is determined;
the specific method for determining the cooling temperature of each empty zone comprises the following steps:
s3.1, determining the maximum temperature reduction of the empty area according to the temperature rise slope of the heat treatment furnace and the moving speed of the steel plate to be treated in the heat treatment furnace;
s3.2, obtaining the maximum furnace area energy-saving temperature of the heat treatment furnace, and taking the smaller value of the maximum degradable temperature and the maximum furnace area energy-saving temperature as the temperature reduction temperature of the empty area.
2. The energy saving method of heat treatment furnace according to claim 1, wherein in step S2, when there is no steel sheet to be treated in any two or more consecutive sub-furnace sections other than the sub-furnace section adjacent to any steel sheet to be treated in the energy saving section, the consecutive sub-furnace sections are determined to be empty sections, respectively.
3. The energy-saving method for a heat treatment furnace according to claim 1, wherein the moving speed of the steel sheet to be treated in the heat treatment furnace is determined based on the temperature rising slope of the heat treatment furnace and the target holding temperature of the steel sheet to be treated.
4. The energy-saving method for a heat treatment furnace according to claim 3, wherein a time interval for the steel sheet to be treated to reach the vacant area is determined based on a position of the steel sheet to be treated which is about to reach the vacant area and a moving speed thereof in the heat treatment furnace, and the maximum drawable temperature of the vacant area is determined based on the time interval and a temperature rising slope of the heat treatment furnace.
5. The energy saving method of the heat treatment furnace according to claim 1, further comprising updating the temperature of each of the empty zones in real time according to the original temperature of the empty zone and the drop temperature of the empty zone.
6. The energy-saving method for the heat treatment furnace according to claim 1, wherein when the steel plates to be treated are not present in all the sub-furnace sections, the heat treatment furnace is in a full-empty-zone state, and all the furnace sections of the heat treatment furnace are cooled according to the maximum furnace section energy-saving temperature.
7. The energy-saving method for a heat treatment furnace according to claim 6, further comprising determining the temperature of temperature rise of the heat treatment furnace based on the temperature of temperature decrease of the heat treatment furnace, a steel plate heating curve, a temperature rise slope of the heat treatment furnace, and a time of furnace entry of the steel plate to be treated when the treatment task is obtained.
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