Sintering ignition furnace hearth temperature control method, equipment and medium

Abstract

The invention discloses a sintering ignition furnace hearth temperature control method, system and equipment and a medium. The method at least comprises the following steps: calculating a final gas flow set value F1; the method specifically comprises the following steps: 1) determining a gas reference flow F0; 2) calculating a gas pressure average value PAvg of m sampling values; (3) the difference value between the average gas pressure and the gas pressure reference value is obtained; 4) obtaining a corrected gas flow reference coefficient K0; 5) determining a temperature output gas flow reference value; 6) correcting a temperature output gas flow reference value F0; 7) further obtaining a set gas flow deviation FT; and (8) obtaining a final gas flow set value F1. By predicting the gas flow reference value and superposing the gas flow deviation value, oscillation of hearth temperature caused by gas pressure fluctuation is effectively avoided, the temperature control precision is improved, stable combustion temperature is provided for sintering production, and the labor intensity of workers is reduced while automatic control is realized.

Description

Technical Field

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

[0002] The sintering system is an important part of the production of pre-iron raw materials, and the ignition furnace is an important equipment for the sintering process to produce sintered ore. The ignition furnace is mainly 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 great influence on the quality of the finished sintered ore. The ignition furnace generally uses the production gas recycled from the steel plant. Its pressure fluctuates greatly, which has a great impact on the gas flow rate, and thus affects the stability of the furnace temperature. Therefore, in order to ensure the quality of the sintered ore, it is necessary to overcome the influence of gas pressure fluctuations and the environment, so that the ignition furnace gas can be fully burned and the furnace temperature can be controlled within the range required by the production process. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the object of the present invention is to provide a method, device and medium for controlling the furnace temperature of a sintering ignition furnace.

[0004] To achieve the above object, the sintering ignition furnace temperature control method of the present invention at least includes calculating the final gas flow setting value F 1 Steps;

[0005] The final gas flow setting value F is calculated 1 The specific steps are:

[0006] 1) Establish a furnace temperature model for the ignition furnace. First, set T according to the ignition furnace temperature. 0 To determine the gas reference flow F 0 When the gas flow rate is F 0 When it is near, the furnace temperature can be maintained within the set temperature range;

[0007] 2) In view of the problem of gas pressure fluctuation, the real-time gas pressure is collected and the average gas pressure value P of m sampling values ​​is calculated by the sliding average method. Avg ;

[0008] 3) According to the normal working pressure of gas pressure, set the gas pressure reference value P B , the difference between the average gas pressure and the reference gas pressure is obtained as follows:

[0009] E P =P B -P Avg

[0010] 4) Preset the reference flow coefficient K according to the furnace temperature model B , when the absolute value of the difference |EP |Greater than the threshold E y When the gas flow rate reference coefficient is corrected, the corrected gas flow rate reference coefficient K is obtained. 0 ,as follows:

[0011] K 0 =K B +K P ×E P

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

[0013] 5) According to the furnace temperature setting value SP_INT, determine the temperature output gas flow reference value as follows:

[0014] F B =SP_INT×K 0 ;

[0015] 6) Preset the reference flow deviation F according to the furnace temperature model Bias , corrected temperature output gas flow reference value F 0 as follows:

[0016] F 0 =F B +F Bias ;

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

[0018] F T =K T ×T_out;

[0019] 8) Superimpose the corrected temperature output gas flow reference value and the set gas flow deviation to obtain the final gas flow set value F 1 ,as follows:

[0020] F 1 =F 0 +F T .

[0022] Furthermore, the method further comprises the steps of:

[0023] 9) Control the gas flow regulating valve through the PI controller to make the gas flow reach the set value.

[0024] Furthermore, the method further comprises the steps of:

[0025] 10) Calculate the air flow setting value according to the preset air-fuel ratio and the gas flow setting value;

[0026] 11) The air flow regulating valve is controlled by the PI controller to make the air flow reach the set value.

[0027] Furthermore, the method further comprises the steps of:

[0028] 12) The gas flow feedback value uses the sliding average method to calculate the gas flow average value of m sampling values;

[0029] 13) The air flow feedback value uses the sliding average method to calculate the air flow average value of n sampling values;

[0030] 14) The m sampling value is between 2 and 10;

[0031] 15) The number of n samples is between 2 and 20;

[0032] 16) The final gas flow setting value is updated according to the set update cycle T M Output to the gas flow regulating valve controller in seconds;

[0033] 17) The air flow setting value is based on the air-fuel ratio and the gas flow setting value, and is updated according to the set update cycle T M Output to the air flow control valve controller in seconds;

[0034] 18) The update cycle of gas pressure feedback value, gas flow feedback value and air flow feedback value is T N seconds, the update frequency is obviously higher than the update cycle T of the gas flow setting value M .

[0035] Furthermore, the air-fuel ratio is 0.68-0.8.

[0036] Furthermore, there are two thermocouples A and B in the furnace temperature of the ignition furnace, which are distributed on both sides of the middle of the furnace; the temperature feedback value adopts thermocouple A, thermocouple B or the average value of thermocouples A and B;

[0037] Furthermore, the gas flow setting value is set after a period T N Update after seconds:

[0038] Set the original gas flow rate to F 0 (k-1) and the new gas flow setting value F 1 Make the difference and compare it with the step size step:

[0039] When |F 1 -F 0 When (k-1)|>step, the step strategy is adopted as follows:

[0040] When F 1 >F0 (k-1), F 0 (k) = F 0 (k-1)+step;

[0041] When F 1 <F 0 (k-1), F 0 (k) = F 0 (k-1)-step;

[0042] When |F 1 -F 0 When (k-1)|≤step, F 0 (k) = F 1 .

[0043] 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 sintering ignition furnace furnace temperature control method is adopted.

[0044] To achieve the above object, the present invention provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium. When the computer program is loaded and executed by a processor, the above-mentioned method for controlling the furnace temperature of a sintering ignition furnace is adopted.

[0045] The present invention effectively avoids the oscillation of furnace temperature caused by gas pressure fluctuation by predicting the gas flow reference value and superimposing the gas flow deviation value, improves the temperature control accuracy, provides a stable combustion temperature for sintering production, realizes automatic control and reduces the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a process diagram of a sintering ignition furnace of the present invention;

[0047] Figure 2 is a control flow chart of the present invention;

[0048] Figure 3 is a calculation flow chart of the gas flow setting value of the present invention;

[0049] Figure 4 is a flow chart of the sliding average method of the present invention;

[0050] Figure 5 It is a step strategy diagram of the gas flow setting value of the present invention. DETAILED DESCRIPTION

[0051] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0052] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Embodiment 1:

[0056] Depend on Figure 1 It can be seen that the objects involved in the ignition furnace temperature control in this example include 1-thermocouple A 2-thermocouple B 3-air flow control valve 4-gas flow control valve 5-air pipe 6-gas pipe 7-gas pressure gauge. Among them, thermocouples A and B are distributed on both sides of the middle of the furnace, which can be used as backup for each other and as reference for each other, reflecting the temperature distribution inside the furnace. This example uses the furnace temperature measured by thermocouple A. In order to ensure that the temperature of the ignition furnace is not too high or too low, the upper and lower limits of the gas flow are set to 20000m 3 / h and 5000m 3 / h.

[0057] The steps of this embodiment are:

[0058] 1) Ignition furnace temperature T 0 Set to 1200°C. The furnace temperature model established based on the furnace temperature historical data and gas flow historical data presets the benchmark flow coefficient K B =9.5, reference flow deviation F Bias = -500;

[0059] 2) Gas pressure reference value PB Set to 8.0 kPa, the sliding average of 10 real-time gas pressure sampling values ​​in this cycle is used to obtain P Avg =7.8kPa, then the difference between the average gas pressure and the reference gas pressure is |8.0-7.8|=0.2kPa;

[0060] 3) Set the pressure difference threshold E y =0.1kPa, since 0.2>E y , then it is necessary to correct the gas flow rate reference coefficient, take K P =1, we get K 0 =9.5+1×0.2=9.7;

[0061] 4) Further, obtain the temperature output gas flow reference value F B =1200×9.7=11640m 3 / h;

[0062] 5) Further, obtain the temperature output gas flow reference value F 0 =11640-500=11140m 3 / h;

[0063] 6) Set the temperature sampling adjustment cycle T M = 20s, gas pressure, gas flow, air flow sampling feedback cycle T N =0.5s;

[0064] 7) The temperature sampling value T(k) of this period is related to the temperature setting value T 0 There is a deviation, so the difference is input into the PID temperature controller, the output T_out is calculated, and the set gas flow deviation F is further obtained. T ;

[0065] 8) Furthermore, the final gas flow setting value F 1 =11140+F T , assuming F 1 =11100m 3 / h;

[0066] 9) Set the air-fuel ratio of air flow to gas flow to 0.7, so that the air flow setting value is 0.7×(11140+F T );

[0067] 10) Gas flow setting value F 1 With the original gas flow setting value F 0 (k-1) is the difference, and the step length is set to 1000m 3 / h,F 0 (k-1)=9000m3 / h, so as to obtain the difference ΔF = 11100 - 9000 = 2100 m 3 / h;

[0068] 11) Further, ΔF > step, so the stepping strategy is adopted. Since F 1 > F 0 (k), therefore, F 0 (k) = 9000 + 1000 = 10000 m 3 / h;

[0069] 12) Input the gas flow rate set value obtained according to the stepping strategy into the PI controller of the gas flow regulating valve. The PI controller operates on the sliding average value of 20 gas flow rate data and the set value to obtain the opening degree of the gas flow regulating valve;

[0070] 13) Within the update period of 20 s for the temperature, after 0.5 s, the gas flow rate repeats steps 10) - 12) until ΔF = 100 m 3 / h, ΔF < step, so according to the stepping strategy, since F 1 < F 0 (k), therefore, F 0 (k) = 11100 m 3 / h;

[0071] 14) Input the final gas flow rate set value into the PI controller of the gas flow regulating valve to obtain the opening degree of the gas flow regulating valve;

[0072] 14) The update method of the air flow rate set value is the same as steps 10), 11), and 13);

[0073] 15) The implementation method of the air flow regulating valve controller is the same as steps 12) and 14);

[0074] 16) After 20 s of the update period, repeat the above steps.

[0075] A method for controlling the temperature of the hearth of a sintering ignition furnace according to the present invention can predict the gas flow rate reference value plus the gas flow rate deviation value, effectively avoid the oscillation of the hearth temperature caused by the gas pressure fluctuation, improve the temperature control accuracy, provide a stable combustion temperature for sintering production, reduce the labor intensity of workers while realizing automatic control.

[0076] This application embodiment 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. Among them, when the processor executes the computer program, the method for controlling the temperature of the hearth of the sintering ignition furnace in the above embodiment is adopted.

[0077] The terminal device may 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 and output devices, a network access device and a bus.

[0078] Among them, the processor can adopt a central processing unit (CPU). Of course, according to actual usage, other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) 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., and this application does not impose any restrictions on this.

[0079] Among them, the memory can be an internal storage unit of the terminal device, such as a hard disk or memory of the terminal device, or it can be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (SMC), a secure digital card (SD) or a flash memory card (FC) equipped on the terminal device, etc., and the memory can also be a combination of an internal storage unit and an external storage device 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 is to be output, and this application does not impose any restrictions on this.

[0080] Among them, through this terminal device, the sintering ignition furnace temperature control method of the above embodiment is stored in the memory of the terminal device, and is loaded and executed on the processor of the terminal device to facilitate user use.

[0081] The embodiment of the present application further discloses a computer-readable storage medium, and the computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, the sintering ignition furnace temperature control method of the above embodiment is adopted.

[0082] Among them, the computer program can be stored in a computer-readable medium, the computer program includes computer program code, the computer program code can be in the form of source code, object code, executable file or certain middleware, etc. The computer-readable medium includes any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the computer-readable medium includes but is not limited to the above-mentioned components.

[0083] Among them, through this computer-readable storage medium, the sintering ignition furnace hearth temperature control method of the above embodiment is stored in the computer-readable storage medium, and is loaded and executed on the processor to facilitate the storage and application of the sintering ignition furnace hearth temperature control method.

[0084] The present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. Many other changes and modifications that do not depart from the concept and scope of the present invention should be regarded as the protection scope of the present invention.

[0085] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0086] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for controlling the furnace temperature of a sintering ignition furnace, characterized in that: At least 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) In view of the problem of gas pressure fluctuation, the real-time gas pressure is collected and the average gas pressure value P of m sampling values ​​is calculated by the sliding average method. Avg ; 3) According to the normal working pressure of gas pressure, set the gas pressure reference value P B , the difference between the average gas pressure and the reference gas pressure is obtained as follows: E P =P B -P Avg ; 4) Preset the reference flow coefficient K according to the furnace temperature model B , when the absolute value of the difference |E P |Greater than the threshold E y When the gas flow rate reference coefficient is corrected, the corrected gas flow rate reference coefficient K0 is obtained as follows: K0=K B +K P ×E P ; Among them, K P is the proportionality coefficient of 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 deviation F according to the furnace temperature model Bias , the corrected temperature output gas flow reference value F0 is as follows: F0=F B +F Bias ; 7) For the temperature deviation under the gas reference flow rate, a PID temperature controller is used to obtain the temperature output T_out, and further obtain the set gas flow deviation F 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 according to claim 1, characterized in that: It also 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 according to claim 2, characterized in that: It also 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 according to claim 3, characterized in that: It also 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 setting value is updated according to the set update cycle T M Output to the gas flow regulating valve controller in seconds; 17) The air flow setting value is based on the air-fuel ratio and the gas flow setting value, and is updated according to the set update cycle T M Output to the air flow control valve controller in seconds; 18) The update cycle of gas pressure feedback value, gas flow feedback value and air flow feedback value is T N seconds, the update frequency is obviously higher than the update cycle T of the gas flow setting value M .

5. The method for controlling the furnace temperature of a sintering ignition furnace according to 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 according to 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, characterized in that The gas flow setting value is set after a period of T N Update after 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 having a computer program stored therein, 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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