CN115710625A - Pulse circulation temperature control method for burner of annealing furnace of hot-rolled stainless steel annealing and pickling unit - Google Patents
Pulse circulation temperature control method for burner of annealing furnace of hot-rolled stainless steel annealing and pickling unit Download PDFInfo
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- CN115710625A CN115710625A CN202211587071.7A CN202211587071A CN115710625A CN 115710625 A CN115710625 A CN 115710625A CN 202211587071 A CN202211587071 A CN 202211587071A CN 115710625 A CN115710625 A CN 115710625A
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Abstract
The invention discloses a pulse circulating temperature control method for a burner of an annealing furnace of a hot-rolled stainless steel annealing and pickling unit, which comprises the following steps of 1, initializing starting commands and actual burning time of each burner, wherein n is the number of the burners, k is the target number of the started burners, and n =0 and k =0 during initialization; step 2, sequentially carrying out single burner circulation control on the nth to nth + k-1 burners, and sequentially carrying out single burner circulation control on the nth to mth burners and the 1 st to nth + k-1-m burners when n + k-1>, wherein each burner is independently timed, the single burner starts circulation logic, and the step 2 is skipped to enter the step 3 when n =0 and k =0; and 3, calculating the number of the burners needing to be started according to the set value of the load factor to be used as a target number k, if the nth burner stops, updating n to be n +1, and obtaining a circulation result that the feedback temperature is close to the set temperature and the actual load factor is stabilized at the set value of the load factor. The method enables the temperature distribution in the area to be more uniform and saves more energy consumption.
Description
Technical Field
The invention relates to the technical field of annealing furnaces of hot-rolled stainless steel processing lines, in particular to a pulse circulating temperature control system method for a burner of an annealing furnace of a hot-rolled stainless steel annealing pickling line.
Background
The annealing furnace has a very important position in the steel industry, the hot-rolled stainless steel annealing and pickling line is widely applied in China, and the annealing furnace is an important link of the hot-rolled stainless steel annealing and pickling line. At present, the annealing furnace temperature control system of the hot-rolled stainless steel annealing and pickling line mainly adopts a double-cross amplitude limiting control mode.
The mode of double-crossing amplitude limiting temperature control is stable under the condition of high temperature, but the burners in the same area are not in a full-open state under the condition of low temperature, so that the temperature is difficult to control. In addition, the temperature of the single-point burner is manually increased during the furnace baking period, so that the uniform heating in the hearth is difficult to ensure.
Disclosure of Invention
The invention aims to provide a pulse circulation temperature control method for a burner of an annealing furnace of a hot-rolled stainless steel annealing and pickling unit, aiming at the technical defect that the start and stop of the burner are basically manually controlled at the furnace baking or low-temperature stage of the annealing furnace in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a pulse circulation temperature control method for burners of an annealing furnace of a hot-rolled stainless steel annealing and pickling line is characterized in that the pulse circulation temperature control method controls m burners in an area in a heating section of the annealing furnace, the burners in the area are uniformly distributed from the 1 st to the m th, and the pulse circulation temperature control method comprises the following steps:
step 1, initializing a starting command and actual combustion time of each burner, wherein n is the number of the burners, k is the target number of the started burners, and n =0 and k =0 during initialization;
step 2, sequentially carrying out the following single burner circulation control on the No. 1 to No. m burners, independently timing each burner, starting circulation logic on each single burner, and skipping the step 2 to the step 3 when n =0 and k = 0:
the single burner start-up cycle logic is as follows:
step s1, firstly, judging whether the actual combustion time of the current burner is 0, if so, jumping to step s2, and if not, comparing the actual combustion time of the current burner with the opening time of the burner, wherein the specific comparison criteria are as follows:
when the set load rate is smaller than the load rates of all the burners, comparing the actual combustion time of the burners with the opening time of the burners; if the comparison result is greater than or equal to the preset threshold value, resetting the actual combustion time of the burner and closing the burner, and if the comparison result is smaller than the preset threshold value, increasing the actual combustion time of the burner and continuously opening the burner;
step s2, judging whether the cycle number of the starting cycle of a single burner exceeds m, if not, circulating to the step s1 to start judging the next burner, and if so, jumping out of the cycle, and performing the step 3;
step 3, calculating the number of burners needing to be started according to the load factor set value to serve as a target number k, if the nth burner stops, updating n to be n +1, when n exceeds the maximum number m of burners in the area, n =1, then performing step 4, and if the nth burner does not stop, circulating to the step 2;
step 4, taking the burners from the nth to the nth + k-1 of the area as target burners, and taking the burners from the nth to the mth and the burners from the 1 to the nth + k-1-m as target burners when n + k-1 >; setting the actual combustion time of the target burner to be 1, setting the actual combustion time of other burners to be 0, and circulating to the step 2;
the result of the cycle is that the feedback temperature approaches the set temperature and the actual load factor stabilizes at the load factor set value.
In the technical scheme, the opening load rate of all the burners is 92-97%, and the optimal load rate is 95%.
In the technical scheme, if the load rate set value is less than 1-the load rates of all the burners, the burners are all closed, and if the load rate set value is greater than the load rates of all the burners, the burners are all opened.
In the above technical scheme, the control system based on the method comprises a main controller, a remote IO controller and an upper computer, wherein: the upper computer is in communication connection with the main controller, the main controller is connected with the burner controller through a remote IO controller, and the burner controller controls starting and stopping of the burner.
In the technical scheme, the thermocouple collects the temperature of the area as the feedback temperature, the thermocouple transmits data to the temperature regulator in the main controller, the temperature of the area is set as the set temperature on the upper computer, and the set value of the load factor is determined by the feedback temperature and the set temperature.
In the technical scheme, the load rate set value and the load rates of all the burners are manually input on an upper computer, or the load rate set value is output by the temperature regulator.
In the technical scheme, the main controller selects an S7-1500 series CPU, a TIA Portal V17 development program is used, the remote IO controller selects an ET200SP series remote module, the remote IO controller is connected with N burner controller signals, and each burner controller controls the start and stop of one burner.
In the technical scheme, profinet communication is adopted between the S7-1500 series CPU and the remote IO controller, the remote IO controller is connected with the burner controller through a hard wire, and the upper computer is communicated with the main controller through Ethernet.
In the technical scheme, the shortest combustion period = the shortest combustion time + the combustion overtime time, wherein the shortest combustion time and the combustion overtime time are both set manually;
pulse switch point load rate = minimum burn time maximum load rate/minimum burn period;
the burner closing time = minimum combustion time + maximum load rate/set value of load rate-minimum combustion time;
when the set load rate value is less than 1-the load rates of all burners on, the burner off time = the minimum combustion time;
the burner opening time = combustion overtime load rate set value/(maximum load rate-load rate set value);
when the load rate set value is larger than the load rate of the pulse switching point, the opening time of the burner = the minimum combustion time;
in the above-described embodiment, the maximum load factor is set to 99 to 101%, preferably 100%.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the pulse cycle starting control of the annealing furnace burner of the continuous annealing and pickling line and greatly improves the electric control automation degree of the annealing furnace.
2. The burner pulse circulation temperature control system has the advantages of greatly reducing energy consumption, enabling the interior of a hearth to be heated uniformly, reducing the generation of NOx and the like, and provides powerful technical support for the construction of an annealing furnace of a continuous annealing and pickling unit.
3. The invention is based on the PLC technology, adopts the Profinet communication protocol and ensures the stability of the annealing furnace system.
Drawings
Fig. 1 is a schematic structural diagram of a control system according to the present invention.
FIG. 2 is a schematic temperature PID diagram.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A pulse circulation temperature control method for a burner of an annealing furnace of a hot-rolled stainless steel annealing and pickling line is based on a control system which comprises a main controller, a remote IO controller and an upper computer, wherein:
in the embodiment, a Siemens S7-1500 series CPU is selected as a main controller, a TIA Portal V17 development program is used, a Siemens ET200SP series remote module is selected as a remote IO controller, the remote IO controller is connected with N burner controller signals, each burner controller controls the start and stop of one burner, profinet communication is adopted between the Siemens S7-1500 series CPU and the remote IO controller, the remote IO controller is connected with the burner controller through a hard wire, an upper computer uses WINCC7.5 software to develop an upper computer HMI system, and the upper computer and the main controller are communicated through Ethernet.
The circulating temperature control method is characterized in that m burners in one area in a heating section of the annealing furnace are controlled, the burners in the area are uniformly distributed from the first to the mth, a thermocouple collects the temperature of the area as feedback temperature, the thermocouple transmits data to a temperature regulator in the main controller, the temperature of the area is set on the upper computer as set temperature, and the set load rate value is determined by the feedback temperature and the set temperature. The set load rate value and the load rates of all the burners are manually input on an upper computer, or the set load rate value is output by the temperature regulator.
Calculating the opening time of the burner, the closing time of the burner and the period time of the burner according to the set value of the load factor, wherein the specific calculation method comprises the following steps:
the shortest combustion period = the shortest combustion time + the combustion overtime time, wherein the shortest combustion time and the combustion overtime time are both set manually;
the load rate of the pulse switching point = minimum combustion time × maximum load rate/minimum combustion cycle, and the maximum load rate is generally set to 100% and may be set according to an actual situation;
burner off time = minimum burning time max load rate/load rate set value-minimum burning time;
when the load factor set value is less than 5%, the burner closing time = the minimum combustion time;
the burner opening time = combustion overtime load rate set value/(maximum load rate-load rate set value);
when the load rate set value is larger than the load rate of the pulse switching point, the opening time of the burner = the minimum combustion time;
the pulse circulation temperature control method comprises the following steps:
step 1, initializing a starting command and actual combustion time of each burner, wherein n is the number of the burners, k is the target number of the started burners, and n =0 and k =0 during initialization;
step 2, sequentially carrying out the following single burner circulation control on the No. 1 to No. m burners, independently timing each burner, starting circulation logic on each single burner, and skipping the step 2 to the step 3 when n =0 and k = 0:
the single burner start-up cycle logic is as follows:
step s1, firstly, judging whether the actual combustion time of the current burner is 0, if so, jumping to step s2, and if not, comparing the actual combustion time of the current burner with the opening time of the burner, wherein the specific comparison criteria are as follows:
when the set load rate is smaller than the load rates of all the burners, comparing the actual combustion time of the burners with the opening time of the burners; if the comparison result is greater than or equal to the preset threshold value, resetting the actual combustion time of the burner and closing the burner, and if the comparison result is smaller than the preset threshold value, increasing the actual combustion time of the burner and continuously opening the burner;
step s2, judging whether the cycle number of the starting cycle of a single burner exceeds m, if not, circulating to the step s1 to start judging the next burner, if so, jumping out of the cycle, and performing the step 3;
step 3, calculating the number of burners needing to be started according to the set value of the load factor to be used as a target number k, if the nth burner stops, updating n to be n +1, when n exceeds the maximum number m of burners in the region, n =1, then performing step 4, and if the nth burner does not stop, circulating to the step 2;
step 4, taking the burners from the nth to the nth + k-1 of the area as target burners, and taking the burners from the nth to the mth and the burners from the 1 to the nth + k-1-m as target burners when n + k-1 >; setting the actual combustion time of the target burner to be 1, setting the actual combustion time of other burners to be 0, and circulating to the step 2;
the result of the cycle is that the feedback temperature is close to the set temperature and the actual load factor is stabilized at the set load factor value.
In the above steps, if the set load factor is less than 1-the load factors (95%) of all burners are opened, the burners are all closed, and if the set load factor is greater than the load factors (95%) of all burners are opened, the burners are all opened.
Example 2
And 10 burners, namely m =10, are arranged in one area of the heating section of the annealing furnace, and are uniformly distributed in the area and are No. 1-No. 10 burners respectively.
Step 1, in initialization, n =0, k =0;
entering step 3, calculating the number of burners to be started according to the set load factor value, and calculating the obtained target number k =3;
step 4, taking No. 1 to No. 3 burners in the area as target burners, setting the actual combustion time of the target burners to be 1, setting the actual combustion time of other burners to be 0, and circulating to the step 2;
step 2, sequentially carrying out the following single burner circulation control on the No. 1 to No. 10 burners, independently timing each burner, and starting circulation logic of each single burner:
step s1, firstly, judging whether the actual combustion time of the No. 1 burner is 0, if not, comparing the actual combustion time of the burner with the opening time of the burner, wherein the specific comparison criterion is as follows: when the set load rate is less than the load rates (95%) of all the burners, comparing the actual combustion time of the burners with the opening time of the burners; if the comparison result is greater than or equal to the preset threshold value, resetting the actual combustion time of the burner and closing the burner, and if the comparison result is smaller than the preset threshold value, increasing the actual combustion time of the burner and continuously opening the burner;
step s2, if the cycle number is 1 and does not exceed 10, continuing the step s1 by the No. 2 burner, if the cycle number is 2 and does not exceed 10, continuing the step s1 by the No. 3 burner, if the cycle number is 3, then continuing the step s1 by the No. 4 burner, if the actual combustion time of the No. 4 burner is 0, not executing the starting cycle logic of a single burner, sequentially circulating the cycle number +1 until the cycle number is 10, and jumping out to perform the step 3;
and 3, if k is still 3 in the calculation, if the No. 1 burner stops, updating n to be 2, taking the No. 2 to No. 4 burners as target burners, and sequentially carrying out single burner circulation control on the No. 2 to No. 4 burners: if the No. 2 burner stops, continuing to update n to be 3, taking the No. 3 to No. 5 burners as target burners, sequentially updating and sequentially performing single burner circulation control until the No. 9 to No. 10 burners and the No. 1 burner are target burners when n = 9;
all the processes are the condition that k is not changed, and if the value of k calculated here is 4, the No. 10, no. 1, no. 2 and No. 3 burners are target burners.
Until the feedback temperature approaches the set temperature and the actual load rate is stabilized at the set value.
The method enables the temperature distribution in the area to be more uniform and saves more energy consumption.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The pulse circulation temperature control method for the burners of the annealing furnace of the hot-rolled stainless steel annealing and pickling line is characterized by comprising the following steps of:
step 1, initializing a starting command and actual combustion time of each burner, wherein n is the number of the burners, k is the target number of the started burners, and n =0 and k =0 during initialization;
step 2, sequentially carrying out the following single burner circulation control on the No. 1 to No. m burners, independently timing each burner, starting circulation logic on each single burner, and skipping the step 2 to the step 3 when n =0 and k = 0:
the single burner start-up cycle logic is as follows:
step s1, firstly, judging whether the actual combustion time of the current burner is 0, if so, jumping to step s2, and if not, comparing the actual combustion time of the current burner with the opening time of the burner, wherein the specific comparison criteria are as follows:
when the set load rate value is smaller than the load rates of all the burners, comparing the actual combustion time of the burners with the opening time of the burners; if the comparison result is greater than or equal to the preset threshold value, resetting the actual combustion time of the burner and closing the burner, and if the comparison result is smaller than the preset threshold value, increasing the actual combustion time of the burner and continuously opening the burner;
step s2, judging whether the cycle number of the starting cycle of a single burner reaches m, if not, circulating to the step s1 to start judging the next burner, if so, jumping out of the cycle, and performing the step 3;
step 3, calculating the number of burners needing to be started according to the load factor set value to serve as a target number k, if the nth burner stops, updating n to be n +1, when n exceeds the maximum number m of burners in the area, n =1, then performing step 4, and if the nth burner does not stop, circulating to the step 2;
step 4, taking the burners from the nth to the nth + k-1 of the area as target burners, and taking the burners from the nth to the mth and the burners from the 1 to the nth + k-1-m as target burners when n + k-1 >; setting the actual combustion time of the target burner to be 1, setting the actual combustion time of other burners to be 0, and circulating to the step 2;
the result of the cycle is that the feedback temperature is close to the set temperature and the actual load factor is stabilized at the set load factor value.
2. The pulse circulation temperature control method for the burners of the annealing lehr of the hot-rolled stainless steel annealing and pickling line according to claim 1, wherein the load rate of opening all the burners is 92 to 97%, preferably 95%.
3. The hot-rolled stainless steel annealing and pickling line annealing furnace burner pulse cycle temperature control method as claimed in claim 1, wherein if the load rate set value is < 1-the load rate at which all burners are opened, the burners are all closed, and if the load rate set value > the load rate at which all burners are opened, the burners are all opened.
4. The hot-rolled stainless steel annealing and pickling line annealing furnace burner pulse circulation temperature control method according to claim 1, wherein a control system based on the method comprises a main controller, a remote IO controller and an upper computer, wherein: the upper computer is in communication connection with the main controller, the main controller is connected with the burner controller through a remote IO controller, and the burner controller controls starting and stopping of the burner.
5. The hot rolled stainless steel annealing and pickling line annealing furnace burner pulse cycle temperature control method according to claim 4, wherein a thermocouple collects the temperature of the local area as a feedback temperature, the thermocouple transmits data to a temperature regulator in the main controller, the temperature of the local area is set on the upper computer as a set temperature, and the set load factor value is determined by the feedback temperature and the set temperature.
6. The hot-rolled stainless steel annealing and pickling line annealing furnace burner pulse cycle temperature control method according to claim 5, wherein the load rate set value and the load rates of all burners on are manually input on an upper computer, or the load rate set value is output by the temperature regulator.
7. The hot-rolled stainless steel annealing and pickling line annealing furnace burner pulse cycle temperature control method as claimed in claim 4, wherein an S7-1500 series CPU is selected as the main controller, a TIA Portal V17 development program is used, an ET200SP series remote module is selected as the remote IO controller, the remote IO controller is connected with N burner controller signals, and each burner controller controls the start and stop of one burner.
8. The hot-rolled stainless steel annealing and pickling line annealing furnace burner pulse cycle temperature control method according to claim 4, wherein Profinet communication is adopted between an S7-1500 series CPU and the remote IO controller, the remote IO controller is connected with the burner controller through a hard wire, and the upper computer is communicated with the main controller through Ethernet.
9. The hot-rolled stainless steel annealing and pickling line annealing furnace burner pulse cycle temperature control method as claimed in claim 1, wherein the shortest combustion period = the shortest combustion time + the combustion timeout time, wherein the shortest combustion time and the combustion timeout time are both set manually;
pulse switch point load rate = minimum burn time max load rate/minimum burn period;
burner off time = minimum burning time max load rate/load rate set value-minimum burning time;
when the set load rate value is less than 1-the load rates of all burners, the burner closing time = the minimum combustion time;
the burner opening time = combustion overtime load rate set value/(maximum load rate-load rate set value);
when the load rate set value is larger than the load rate of the pulse switching point, the opening time of the burner = the minimum combustion time;
10. the pulse-cycle temperature control method for the burners of the annealing lehr of the hot rolled stainless steel annealing pickling line according to claim 9, wherein the maximum load factor is set to 99 to 101%, preferably 100%.
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| CN202211587071.7A CN115710625A (en) | 2022-12-11 | 2022-12-11 | Pulse circulation temperature control method for burner of annealing furnace of hot-rolled stainless steel annealing and pickling unit |
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| CN202211587071.7A CN115710625A (en) | 2022-12-11 | 2022-12-11 | Pulse circulation temperature control method for burner of annealing furnace of hot-rolled stainless steel annealing and pickling unit |
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