A sintering ignition furnace hearth temperature control method, device and medium

Abstract

The application discloses a sinter ignition furnace hearth temperature control method, system, equipment and medium. At least comprising the steps of calculating the final gas flow setting value F1; specifically: 1) determining the gas reference flow F0; 2) calculating the average value P of m sampling values of the gas pressure Avg ; 3) obtaining the difference between the average gas pressure and the gas pressure reference value; 4) obtaining the corrected gas flow reference coefficient K0; 5) determining the temperature output gas flow reference value; 6) correcting the temperature output gas flow reference value F0; 7) further obtaining the set gas flow deviation F T ; 8) obtaining the final gas flow setting value F1. By superimposing the gas flow deviation value on the predicted gas flow reference value, the gas pressure fluctuation caused by the hearth temperature oscillation is effectively avoided, the temperature control precision is improved, a stable combustion temperature is provided for sintering production, automatic control is realized, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] This invention relates to a method, equipment, and medium for controlling the furnace temperature of a sintering ignition furnace. Background Technology

[0002] The sintering system is a crucial link in the raw material production process for ironmaking, and the ignition furnace is a vital piece of equipment in the sintering process for producing sintered ore. The ignition furnace is primarily used to ignite the mixture on the sintering trolley and maintain it within the required combustion temperature range. The temperature control of the ignition furnace has a significant impact on the quality of the finished sintered ore. The ignition furnace typically uses recycled production gas from the steel plant, whose pressure fluctuates considerably, significantly affecting the gas flow rate and consequently the stability of the furnace temperature. Therefore, to ensure the quality of the sintered ore, it is essential to overcome the influence of gas pressure fluctuations and environmental factors, ensuring complete combustion of the ignition furnace gas and controlling the furnace temperature within the range required by the production process. Summary of the Invention

[0003] To overcome the above-mentioned defects, the purpose of this invention is to provide a method, equipment and medium for controlling the furnace temperature of a sintering ignition furnace.

[0004] To achieve the above objectives, the sintering furnace temperature control method of the present invention includes at least the step of calculating the final gas flow rate setpoint F1.

[0005] The specific steps for calculating the final gas flow rate setpoint F1 are as follows:

[0006] 1) Establish a furnace temperature model for the ignition furnace. First, determine the reference gas flow rate F0 based on the ignition furnace temperature setting T0. When the gas flow rate is near F0, the furnace temperature can be maintained within the set temperature range.

[0007] 2) To address the issue of fluctuating gas pressure, real-time gas pressure data is collected, and the average gas pressure P is calculated using the moving average method for m sampled values. Avg ;

[0008] 3) Set the gas pressure reference value P based on the normal operating pressure of the gas. B The difference between the average gas pressure and the reference gas pressure value is calculated as follows:

[0009] E P =P B -P Avg

[0010] 4) Preset the reference flow coefficient K based on the furnace temperature model. B When the absolute value of the difference is |E P |Greater than threshold E y At that time, the reference coefficient for gas flow rate is corrected to obtain the corrected reference coefficient for gas flow rate K0, as follows:

[0011] K0 = K B +K P ×E P

[0012] Among them, K P This is the proportionality coefficient for the pressure difference;

[0013] 5) Based on the furnace temperature setpoint SP_INT, determine the baseline value for the temperature output gas flow rate as follows:

[0014] F B =SP_INT×K0;

[0015] 6) Preset the reference flow rate deviation F based on the furnace temperature model. Bias The corrected temperature output gas flow rate reference value F0 is as follows:

[0016] F0 = F B +F Bias ;

[0017] 7) To address the temperature deviation at the reference gas flow rate, a PID temperature controller is used to obtain the temperature output T_out, and the set gas flow deviation F is further obtained. T ,as follows:

[0018] F T =K T ×T_out;

[0019] 8) The corrected temperature output gas flow rate reference value is superimposed with the set gas flow rate deviation to obtain the final gas flow rate setpoint F1, as follows:

[0020] F1 = F0 + F T

[0021] Furthermore, it also includes the following steps:

[0022] 9) The gas flow regulating valve is controlled by a PI controller to make the gas flow reach the set value.

[0023] Furthermore, it also includes the following steps:

[0024] 10) Calculate the air flow rate setting value based on the preset air-fuel ratio and gas flow rate setting value;

[0025] 11) The air flow regulating valve is controlled by a PI controller to make the air flow reach the set value.

[0026] Furthermore, it also includes the following steps:

[0027] 12) The average gas flow rate of m sampled values ​​is calculated using the moving average method.

[0028] 13) The air flow feedback value is calculated by the moving average method to obtain the average air flow value of n sampling values;

[0029] 14) The m sampling values are between 2 and 10;

[0030] 15) The n sampling values are between 2 and 20;

[0031] 16) The final gas flow set value is output to the gas flow regulating valve controller according to the set update period T M seconds;

[0032] 17) The air flow set value is output to the air flow regulating valve controller according to the air-fuel ratio and the gas flow set value, according to the set update period T M seconds;

[0033] 18) The update period of the gas pressure feedback value, the gas flow feedback value and the air flow feedback value is T N seconds, and the update frequency is significantly higher than the update period T of the gas flow set value M .

[0034] Furthermore, the air-fuel ratio is 0.68 - 0.8.

[0035] Furthermore, there are two thermocouples A and B in the ignition furnace hearth, distributed on both sides of the middle of the hearth; the temperature feedback value uses thermocouple A, uses thermocouple B, or uses the average value of thermocouple A and B;

[0036] Furthermore, the gas flow set value is updated after a period of T N seconds:

[0037] Take the difference between the original gas flow set value F0(k - 1) and the new gas flow set value F1, and compare it with the step size step: [[ID=ISI]]

[0038] When |F1 - F0(k - 1)| > step, adopt the stepping strategy as follows:

[0039] When F1 > F0(k - 1), F0(k) = F0(k - 1) + step;

[0040] When F1 < F0(k - 1), F0(k) = F0(k - 1) - step;

[0041] When |F1 - F0(k - 1)| ≤ step, F0(k) = F1.

[0042] To achieve the above objectives, the terminal device of the present invention includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor loads and executes the computer program, the above-mentioned method for controlling the furnace temperature of the sintering ignition furnace is adopted.

[0043] To achieve the above objectives, the present invention provides a computer-readable storage medium storing a computer program, wherein when the computer program is loaded and executed by a processor, the above-described method for controlling the furnace temperature of a sintering ignition furnace is employed.

[0044] This invention effectively avoids furnace temperature oscillations caused by gas pressure fluctuations by superimposing a predicted gas flow rate benchmark value with a gas flow rate deviation value, and improves temperature control accuracy. It provides a stable combustion temperature for sintering production, achieves automatic control, and reduces the labor intensity of workers. Attached Figure Description

[0045] Figure 1 This is a process diagram of the sintering ignition furnace of the present invention;

[0046] Figure 2 This is the control flowchart of the present invention;

[0047] Figure 3 This is a flowchart illustrating the calculation of the gas flow rate setpoint of the present invention;

[0048] Figure 4 This is a flowchart of the moving average method of the present invention;

[0049] Figure 5 This is a step strategy diagram for the gas flow rate setting value of the present invention. Detailed Implementation

[0050] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] Example 1:

[0055] Depend on Figure 1 As can be seen, the objects involved in the furnace temperature control of the ignition furnace in this example include: 1-Thermocouple A, 2-Thermocouple B, 3-Air flow regulating valve, 4-Gas flow regulating valve, 5-Air pipe, 6-Gas pipe, and 7-Gas pressure gauge. Thermocouples A and B are located on both sides of the middle of the furnace, serving as backups for each other and providing mutual reference to reflect the internal temperature distribution of the furnace. This example uses the furnace temperature measured by thermocouple A. To ensure that the furnace temperature is not too high or too low, the upper and lower limits for the gas flow rate are set at 20,000 m³ / h. 3 / h and 5000m 3 / h.

[0056] The steps in this embodiment are as follows:

[0057] 1) The furnace temperature T0 of the ignition furnace is set to 1200℃. A baseline flow coefficient K is preset in the furnace temperature model established based on historical furnace temperature and gas flow data. B =9.5, reference flow deviation F Bias =-500;

[0058] 2) Gas pressure reference value P B The pressure was set at 8.0 kPa, and P was obtained by moving average of 10 real-time gas pressure samples in this cycle. Avg =7.8 kPa, then the difference between the average gas pressure and the reference gas pressure is |8.0 - 7.8| = 0.2 kPa;

[0059] 3) Set the threshold value E for the pressure difference. y =0.1 kPa, since 0.2 > E y Then the gas flow rate reference coefficient needs to be adjusted, taking K as the reference value. P=1, so K0 = 9.5 + 1 × 0.2 = 9.7;

[0060] 4) Further, the reference value F for temperature output gas flow rate is obtained. B =1200 × 9.7 = 11640m 3 / h;

[0061] 5) Further, the baseline value of the temperature output gas flow rate is obtained as F0 = 11640 - 500 = 11140 m³. 3 / h;

[0062] 6) Set the temperature sampling and adjustment period T M =20s, sampling feedback period T for gas pressure, gas flow rate, and air flow rate N =0.5s;

[0063] 7) The temperature sampling value T(k) in this cycle deviates from the temperature setpoint T0. Therefore, the difference is input to the PID temperature controller to calculate the output T_out, and further obtain the set gas flow deviation F. T ;

[0064] 8) Further, the final gas flow rate setpoint F1 = 11140 + F T Assume F1 = 11100m 3 / h;

[0065] 9) Set the air-fuel ratio of airflow to gas flow to 0.7, thus obtaining the airflow setpoint value as 0.7 × (11140 + F). T );

[0066] 10) The difference between the gas flow rate setpoint F1 and the original gas flow rate setpoint F0(k-1) is calculated, with a set step size of step = 1000m. 3 / h, F0(k-1)=9000m 3 / h, thus obtaining the difference ΔF = 11100 - 9000 = 2100m 3 / h;

[0067] 11) Further, ΔF > step, thus a step strategy is adopted. Since F1 > F0(k), therefore, F0(k) = 9000 + 1000 = 10000m 3 / h;

[0068] 12) The gas flow setpoint obtained according to the step strategy is input into the PI controller of the gas flow regulating valve. The PI controller calculates the opening degree of the gas flow regulating valve by comparing the sliding average value of 20 gas flow data with the setpoint.

[0069] 13) Within the update cycle of 20 s, after 0.5 s for the gas flow rate, repeat steps 10) - 12) until ΔF = 100 m 3 / h and ΔF < step. Thus, according to the stepping strategy, since F1 < F0(k), then F0(k) = 11100 m 3 / h;

[0070] 14) Input the final set value of the gas flow rate into the PI controller of the gas flow regulating valve to obtain the opening of the gas flow regulating valve;

[0071] 14) The update method of the air flow rate set value is the same as steps 10), 11), and 13);

[0072] 15) The implementation method of the air flow regulating valve controller is the same as steps 12) and 14);

[0073] 16) After a 20 - s update cycle, repeat the above steps.

[0074] A method for controlling the furnace temperature of a sintering ignition furnace according to the present invention can predict the gas flow rate reference value superimposed with the gas flow rate deviation value, effectively avoid the oscillation of the furnace temperature caused by gas pressure fluctuations, improve the temperature control accuracy, provide a stable combustion temperature for sintering production, and reduce the labor intensity of workers while achieving automatic control.

[0075] The embodiment of the present application also discloses a terminal device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, the method for controlling the furnace temperature of the sintering ignition furnace in the above - mentioned embodiment is adopted.

[0076] Among them, the terminal device can be a computer device such as a desktop computer, a laptop computer, or a cloud server. And the terminal device includes but is not limited to a processor and a memory. For example, the terminal device may also include input - output devices, network access devices, and a bus, etc.

[0077] Among them, the processor can adopt a central processing unit (CPU). Of course, according to the actual usage situation, other general - purpose processors, digital signal processors (DSPs), application - specific integrated circuits (ASICs), field - programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. can also be adopted. The general - purpose processor can adopt a microprocessor or any conventional processor, etc. The present application does not make any restrictions on this. [[ID=,30]]

[0078] The memory can be an internal storage unit of the terminal device, such as a hard disk or RAM of the terminal device, or an external storage device of the terminal device, such as a plug-in hard disk, smart memory card (SMC), secure digital card (SD), or flash memory card (FC) equipped on the terminal device. Furthermore, the memory can be a combination of internal storage units and external storage devices of the terminal device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory can also be used to temporarily store data that has been output or will be output. This application does not limit this.

[0079] The sintering furnace temperature control method of the above embodiment is stored in the memory of the terminal device and loaded and executed on the processor of the terminal device for user convenience.

[0080] This application also discloses a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it employs the sintering ignition furnace temperature control method described above.

[0081] The computer program can be stored in a computer-readable medium. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or certain middleware. The computer-readable medium includes any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the computer-readable medium includes, but is not limited to, the above-mentioned components.

[0082] The sintering furnace temperature control method of the above embodiments is stored in the computer-readable storage medium and loaded and executed on the processor to facilitate the storage and application of the sintering furnace temperature control method.

[0083] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0084] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for controlling the furnace temperature of a sintering ignition furnace, characterized in that, including the step of calculating the final gas flow rate set value F1; the specific steps are as follows: 1) Establish a furnace temperature model for the ignition furnace. First, determine the gas reference flow rate F0 according to the ignition furnace temperature setting T0. When the gas flow rate is near F0, the furnace temperature can be maintained within the set temperature range; 2) To address the issue of fluctuating gas pressure, real-time gas pressure data is collected, and the average gas pressure P is calculated using the moving average method for m sampled values. Avg ; 3) Set the gas pressure reference value P based on the normal operating pressure of the gas. B The difference between the average gas pressure and the reference gas pressure value is calculated as follows: E P =P B -P Avg ; 4) Preset the reference flow coefficient K based on the furnace temperature model. B When the absolute value of the difference is |E P |Greater than threshold E y At that time, the reference coefficient for gas flow rate is corrected to obtain the corrected reference coefficient for gas flow rate K0, as follows: K0=K B +K P ×E P ; Among them, K P This is the proportionality coefficient for the pressure difference; 5) Determine the temperature output gas flow rate reference value according to the furnace temperature set value SP_INT as follows: F B =SP_INT×K0; 6) Preset the reference flow rate deviation F based on the furnace temperature model. Bias The corrected temperature output gas flow rate reference value F0 is as follows: F0=F B +F Bias ; 7) To address the temperature deviation at the reference gas flow rate, a PID temperature controller is used to obtain the temperature output T_out, and the set gas flow deviation F is further obtained. T ,as follows: F T =K T ×T_out; 8) Superimpose the corrected temperature output gas flow rate reference value and the set gas flow rate deviation to obtain the final gas flow rate set value F1, as follows: F1=F0+F T 。 2. The method for controlling the furnace temperature of a sintering ignition furnace as described in claim 1, characterized in that, It further includes the steps: 9) Control the gas flow regulating valve through a PI controller to make the gas flow rate reach the set value.

3. The method for controlling the furnace temperature of a sintering ignition furnace as described in claim 2, characterized in that, It further includes the steps: 10) Calculate the air flow rate set value according to the preset air-fuel ratio and the gas flow rate set value; 11) Control the air flow regulating valve through a PI controller to make the air flow rate reach the set value.

4. The method for controlling the furnace temperature of a sintering ignition furnace as described in claim 3, characterized in that, It further includes the steps: 12) The gas flow rate feedback value is calculated by using the moving average method to obtain the average value of the gas flow rate of n sampling values; 13) The air flow rate feedback value is calculated by using the moving average method to obtain the average value of the air flow rate of n sampling values; 14) The m sampling values are between 2 and 10; 15) The n sampling values are between 2 and 20; 16) The final gas flow rate setpoint is based on the set update cycle T. M The output is sent to the gas flow regulating valve controller in seconds; 17) The air flow rate setpoint is based on the air-fuel ratio and gas flow rate setpoints, and is updated according to the set update cycle T. M The output is sent to the air flow regulating valve controller in seconds; 18) The update cycle for the gas pressure feedback value, gas flow feedback value, and air flow feedback value is T. N The update frequency is significantly higher than the update cycle T of the gas flow rate setpoint. M .

5. The method for controlling the furnace temperature of a sintering ignition furnace as described in claim 3, characterized in that, The air-fuel ratio is 0.68 to 0.

8.

6. The method for controlling the furnace temperature of a sintering ignition furnace as described in claim 3, characterized in that, There are two thermocouples A and B in the ignition furnace hearth temperature, distributed on both sides of the middle of the hearth; the temperature feedback value uses thermocouple A, uses thermocouple B, or uses the average value of thermocouple A and B.

7. The sintering ignition furnace hearth temperature control method according to claim 3, wherein The gas flow rate setpoint after a period T N Updated in seconds: Take the difference between the original gas flow rate set value F0(k - 1) and the new gas flow rate set value F1, and compare it with the step size step: When |F1 - F0(k - 1)| > step, adopt the stepping strategy, as follows: When F1 > F0(k - 1), F0(k) = F0(k - 1) + step; When F1 < F0(k - 1), F0(k) = F0(k - 1) - step; When |F1 - F0(k - 1)| ≤ step, F0(k) = F1.

8. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that, When the processor loads and executes the computer program, it adopts the sintering ignition furnace hearth temperature control method described in claim 1.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is loaded and executed by the processor, it adopts the sintering ignition furnace hearth temperature control method described in claim 1.

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