Blast furnace blast humidification humidity control method, system, equipment and medium

Abstract

The invention discloses a blast furnace blast humidification humidity control method which comprises the following steps: acquiring a steam flow theoretical set value according to a cold air flow measured value, a cold air humidity set value and an ambient atmospheric humidity measured value; based on the deviation between the cold air humidity measurement value and the cold air humidity set value, a steam flow correction value is obtained; the steam flow correction value is used for correcting a steam flow theoretical set value, and a steam flow corrected set value is obtained; and according to the steam flow corrected set value and the steam flow measurement value, a steam flow control output value is obtained to adjust the steam flow. According to the method, the flow of the steam needing to be added is calculated according to the humidification humidity target value, the actual atmospheric humidity value and the actual cold air flow value, the flow of the steam needing to be added is corrected in real time according to the actual humidity detection value of the cold air pipeline, and finally accurate and stable control over the blast humidification humidity of the blast furnace can be achieved.

Description

Technical Field

[0001] The present application relates to the field of metallurgical automation control technology, and more specifically, to a blast furnace humidification humidity control method, system, equipment and medium. Background Art

[0002] Blast furnace humidification is to add an appropriate amount of steam to the blast furnace cold air, send it into the blast furnace through the hot blast stove, and decompose the steam through heat absorption to achieve the purpose of adjusting the blast furnace hearth temperature, promoting smooth furnace conditions, and increasing blast furnace output.

[0003] Production practice shows that: too high theoretical combustion temperature will cause too much peroxide to precipitate in the charge, thus causing the charge to have poor air permeability and affecting smooth operation; while too low theoretical combustion temperature will lead to deterioration of heat exchange in the lower part of the blast furnace, insufficient physical heat of slag iron, poor desulfurization effect, and increase of unburned coal powder, deteriorating the air permeability of the charge column and causing furnace conditions to be unsmooth. Therefore, the blast furnace should determine the reasonable range of the theoretical combustion temperature in combination with its own smelting conditions. It is crucial to keep the theoretical combustion temperature within a reasonable range through various adjustment methods for the smooth operation and stability of the furnace condition.

[0004] However, the effect of blast humidity on blast furnace is significant. 3 The actual theoretical combustion temperature will drop by about 4.58℃. If the blast humidity is unstable and uncontrollable, it will have many adverse effects on the blast furnace. For example, too high humidity at the tuyere will have adverse effects on the blast furnace, which is mainly reflected in the following aspects:

[0005] 1. Furnace condition stability: High humidity will increase the fluctuation of the flame temperature in front of the blast furnace tuyere, thus affecting the stability of the blast furnace condition. This instability may lead to a decrease in the output and quality of the blast furnace.

[0006] 2. Increased coke ratio: High humidity will increase the decomposition heat of moisture in the blast furnace tuyere, thus requiring more coke to maintain the normal operation of the blast furnace, resulting in an increase in the coke ratio and an increase in production costs.

[0007] 3. Limited coal injection: High humidity will reduce the amount of coal injection in the blast furnace, because high humidity will cause coal powder to agglomerate, affecting the injection and combustion of coal powder. This will further affect the output and quality of the blast furnace.

[0008] However, there is no technical means in the prior art that can achieve accurate and stable control of the humidity of blast furnace humidification. Summary of the invention

[0009] In response to at least one defect or improvement need of the prior art, the present application provides a blast furnace blast humidification humidity control method, system, equipment and medium for achieving accurate and stable control of blast furnace blast humidification humidity.

[0010] To achieve the above objectives, in a first aspect, the present application provides a blast furnace humidification humidity control method, comprising:

[0011] Obtain a theoretical set value of steam flow rate according to the measured value of cold air flow rate, the set value of cold air humidity and the measured value of ambient atmospheric humidity;

[0012] Based on the deviation between the cold air humidity measurement value and the cold air humidity setting value, obtaining a steam flow correction value;

[0013] The steam flow rate correction value is used to correct the steam flow rate theoretical setting value to obtain a steam flow rate correction setting value;

[0014] According to the steam flow corrected set value and the steam flow measurement value, a steam flow control output value is obtained for adjusting the steam flow.

[0015] Furthermore, the formula for obtaining the theoretical set value of steam flow rate includes:

[0016] F Steam_Cal_SP =(D Cair_SP -D Air_PV )*F Air_PV / 1000;

[0017] Among them, D Cair_SP Indicates the cold air humidity setting value; D Air_PV Represents the measured value of the ambient atmospheric humidity; F Air_PV Indicates the measured value of the cold air flow rate; F Steam_Cal_SP Indicates the theoretical set value of the steam flow rate.

[0018] Furthermore, the method for obtaining the steam flow correction value includes:

[0019] Adopting PID control algorithm, inputting the cold air humidity measurement value and the cold air humidity setting value, and outputting the cold air humidity control output value;

[0020] The steam flow correction value is obtained based on the cold air humidity control output value.

[0021] Furthermore, the formula for obtaining the steam flow correction value based on the cold air humidity control output value includes:

[0022] F Steam_Mod =(2*CV1-1)*δ;

[0023] Wherein, CV1 represents the cold air humidity control output value; δ represents the flow correction threshold; F Steam_Mod Indicates the steam flow correction value.

[0024] Furthermore, the formula for obtaining the corrected set value of the steam flow rate includes:

[0025] F Steam_SP =F Steam_Cal_SP +F Steam_Mod ;

[0026] Among them, F Steam_SP Indicates the corrected set value of the steam flow rate.

[0027] Furthermore, the method for obtaining the steam flow control output value includes:

[0028] A PID control algorithm is adopted, the steam flow rate correction set value and the steam flow rate measurement value are input, and the steam flow rate control output value is output.

[0029] Furthermore, the specific control method of obtaining the steam flow control output value for adjusting the steam flow includes:

[0030] The steam flow rate is regulated by controlling the steam regulating valve opening based on the obtained steam flow control output value.

[0031] In a second aspect, the present application provides a blast furnace humidification humidity control system, comprising:

[0032] A flow calculator is used to obtain a theoretical steam flow setting value according to a cold air flow measurement value, a cold air humidity setting value and an ambient atmospheric humidity measurement value;

[0033] A flow corrector, used to obtain a steam flow correction value based on a deviation between a cold air humidity measurement value and the cold air humidity setting value; and also used to correct the steam flow theoretical setting value using the steam flow correction value to obtain a steam flow corrected setting value;

[0034] The steam flow regulator is used to obtain a steam flow control output value for regulating the steam flow according to the corrected set value of the steam flow and the measured value of the steam flow.

[0035] In a third aspect, the present application provides an electronic device comprising at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit is enabled to perform the steps of any of the aforementioned humidity control methods.

[0036] In a fourth aspect, the present application provides a storage medium storing a computer program executable by an access authentication device, wherein when the computer program runs on the access authentication device, the access authentication device is enabled to execute the steps of any of the aforementioned humidity control methods.

[0037] In general, the above technical solutions conceived by the present application can achieve the following beneficial effects compared with the prior art:

[0038] The present application calculates the required steam flow rate based on the humidification humidity target value, the actual atmospheric humidity value and the actual cold air flow rate, and makes real-time corrections to the required steam flow rate based on the actual humidity detection value of the cold air duct, ultimately achieving accurate and stable control of the blast furnace humidification humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A core flow chart of a blast furnace humidification humidity control method provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of the air humidification system provided in the embodiment of the present application;

[0042] Figure 3 A schematic diagram of a blast furnace humidification control system provided in an embodiment of the present application;

[0043] Figure 4 A block diagram of an electronic device provided in an embodiment of the present application that is suitable for implementing the humidity control method described above. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] The terms "first", "second" or "nth" in the specification, claims or drawings of the present application are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0046] Definition of terms

[0047] PID is the abbreviation of Proportional, Integral, and Differential. As the name implies, the PID control algorithm is a control algorithm that combines the three links of proportional, integral, and differential. It is the most mature and widely used control algorithm in continuous systems. This control algorithm appeared in the 1930s and 1940s and is suitable for occasions where the model of the controlled object is not clearly understood. Both the actual operation experience and theoretical analysis have shown that when this control law is used to control many industrial processes, relatively satisfactory results can be obtained. The essence of PID control is to perform calculations based on the input deviation value according to the functional relationship of proportional, integral, and differential, and the calculation results are used to control the output.

[0048] The measured value (controlled quantity) of the controlled object - PV, also known as the process value, usually comes from the measuring unit. The set value of the controlled object - SP or SV, also known as the set value, usually comes from the operating unit. The output value of the PID controller - CO or CV or MV, also known as the PID output value, is usually output to the handheld operator or output card.

[0049] As described in the background technology section of the specification, the influence of blast humidity on the blast furnace is significant. However, there is no technical means in the prior art that can achieve accurate and stable control of blast furnace blast humidification humidity. In view of this, the present application proposes a blast furnace blast humidification humidity control method, system, equipment and medium for achieving accurate and stable control of blast furnace blast humidification humidity.

[0050] refer to Figure 1 An embodiment of the present application provides a blast furnace humidification humidity control method, which mainly includes the following steps.

[0051] Step 1: Obtain a theoretical steam flow rate setting value based on a cold air flow rate measurement value, a cold air humidity setting value, and an ambient atmospheric humidity measurement value.

[0052] In some embodiments, specifically, according to the current actual value of the cold air flow rate (the cold air flow rate measurement value) F Air_PV , Cold air humidity setting value D Cair_SP and ambient atmospheric humidity measurement value D Air_PV , calculate the theoretical set value of steam flow (theoretical steam demand) F Steam_Cal_SP The specific formula includes:

[0053] F Steam_Cal_SP =(D Cair_SP -D Air_PV )*FAir_PV / 1000.

[0054] Among them, the cold air flow measurement value F Air_PV The unit is Nm 3 / h. Nm 3 / h is the unit of standard cubic meter per hour, which indicates the gas flow rate per hour under standard conditions.

[0055] Cold air humidity setting value D Cair_SP The unit is g / m 3 , which can be set by the operator.

[0056] Ambient atmospheric humidity measurement value D Air_PV The unit is g / m 3 This quantity can be measured by using a hygrometer to detect the ambient temperature, or the value can be manually entered by the operator.

[0057] Theoretical steam flow setting value F Steam_Cal_SP The unit is t / h.

[0058] Step 2: Based on the deviation between the cold air humidity measurement value and the cold air humidity setting value, obtain the steam flow correction value.

[0059] In some embodiments, specifically, the flow correction range is set to (-δ, +δ), where δ represents the flow correction threshold and the steam flow correction value F Steam_Mod The PID control algorithm is used for calculation, and the input parameter is the cold air humidity set value D Cair_SP , cold air humidity measurement value D Cair_PV , the PID output value is CV1 (0~100%), that is, the output cold air humidity control output value CV1.

[0060] Then, based on the cold air humidity control output value CV1, the steam flow correction value F is obtained. Steam_Mod , the specific formula includes:

[0061] F Steam_Mod =(2*CV1-1)*δ.

[0062] Cold air humidity measurement value D Cair_PV The unit is g / m 3 , which can be detected by a cold wind hygrometer.

[0063] Steam flow correction value F Steam_Mod The unit is t / h.

[0064] Step 3: Use the steam flow correction value to correct the theoretical set value of the steam flow to obtain the corrected set value of the steam flow.

[0065] In some embodiments, specifically, the steam flow rate correction set value F is obtained.Steam_SP The formulas include:

[0066] F Steam_SP =F Steam_Cal_SP +F Steam_Mod .

[0067] Step 4: According to the corrected set value of the steam flow and the measured value of the steam flow, a steam flow control output value is obtained to adjust the steam flow.

[0068] In some embodiments, the steam flow control is specifically calculated using a PID control algorithm, and the input parameter is the steam flow corrected set value F Steam_SP , Steam flow measurement value F Steam_PV , the PID output value is CV2 (0~100%), that is, the steam flow control output value CV2 is output. The steam flow control output value CV2 can be used to control the opening of the steam regulating valve to achieve the regulation of the steam flow.

[0069] Steam flow measurement value F Steam_PV The unit is t / h.

[0070] Steam flow rate correction set value F Steam_SP The unit is t / h.

[0071] The present application calculates the required steam flow rate based on the humidification humidity target value, the actual atmospheric humidity value and the actual cold air flow rate, and makes real-time corrections to the required steam flow rate based on the actual humidity detection value of the cold air duct, ultimately achieving accurate and stable control of the blast furnace humidification humidity.

[0072] refer to Figure 2 and Figure 3 An embodiment of the present application also proposes a blast furnace humidification humidity control system, which mainly includes a flow calculator, a flow corrector and a steam flow regulator.

[0073] The flow calculator is used to obtain the theoretical set value of steam flow according to the measured value of cold air flow, the set value of cold air humidity and the measured value of ambient atmospheric humidity. The cold air main pipe is equipped with a flow detection device with temperature and pressure compensation, which is used to detect and obtain the measured value of cold air flow.

[0074] The flow corrector is used to obtain the steam flow correction value based on the deviation between the cold air humidity measurement value and the cold air humidity setting value; it is also used to correct the steam flow theoretical setting value using the steam flow correction value to obtain the steam flow correction setting value. After humidification, the cold air main pipe is equipped with a humidity detection device to detect the actual humidity of the cold air, and then, according to the actual humidity detection value of the cold air pipe, the required steam flow is corrected in real time.

[0075] The steam flow regulator is used to obtain the steam flow control output value for regulating the steam flow according to the corrected set value of the steam flow and the measured value of the steam flow. A flow detection device is set on the steam pipeline with temperature and pressure compensation to accurately detect the actual flow of steam; in addition, a regulating valve can be set to adjust the steam flow by adjusting the opening of the valve.

[0076] The specific technical details of the blast furnace humidification humidity control system can be referred to the aforementioned embodiment of the blast furnace humidification humidity control method, which will not be repeated here.

[0077] Figure 4 A block diagram of an electronic device suitable for implementing the humidity control method described above according to an embodiment of the present application is schematically shown. Figure 4 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0078] like Figure 4 As shown, the electronic device 1000 described in this embodiment includes: a processor 1001, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage part 1008 to a random access memory (RAM) 1003. The processor 1001 may include, for example, a general-purpose microprocessor (such as a CPU), an instruction set processor and / or a related chipset and / or a dedicated microprocessor (for example, an application-specific integrated circuit (ASIC)), etc. The processor 1001 may also include an onboard memory for caching purposes. The processor 1001 may include a single processing unit or multiple processing units for executing different actions of the humidity control method process according to an embodiment of the present application.

[0079] In RAM 1003, various programs and data required for the operation of electronic device 1000 are stored. Processor 1001, ROM 1002 and RAM 1003 are connected to each other through bus 1004. Processor 1001 performs various operations of the humidity control method flow according to the embodiment of the present application by executing the program in ROM 1002 and / or RAM 1003. It should be noted that the program can also be stored in one or more memories other than ROM 1002 and RAM 1003. Processor 1001 can also perform various operations of the humidity control method flow according to the embodiment of the present application by executing the program stored in the one or more memories.

[0080] According to an embodiment of the present application, the electronic device 1000 may further include an input / output (I / O) interface 1005, which is also connected to the bus 1004. The electronic device 1000 may further include one or more of the following components connected to the I / O interface 1005: an input portion 1006 including a keyboard, a mouse, etc.; an output portion 1007 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage portion 1008 including a hard disk, etc.; and a communication portion 1009 including a network interface card such as a LAN card, a modem, etc. The communication portion 1009 performs communication processing via a network such as the Internet. A drive 1010 is also connected to the I / O interface 1005 as needed. A removable medium 1011, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1010 as needed, so that a computer program read therefrom is installed into the storage portion 1008 as needed.

[0081] According to the humidity control method process of the embodiment of the present application, it can be implemented as a computer software program. For example, the embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program contains a program code for executing the humidity control method shown in the flow chart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 1009, and / or installed from the removable medium 1011. When the computer program is executed by the processor 1001, the above-mentioned functions defined in the system of the embodiment of the present application are executed. According to the embodiment of the present application, the system, equipment, device, module and / or unit described above can be implemented by a computer program module.

[0082] The embodiments of the present application also provide a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments, or may exist independently without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the steps of the humidity control method according to the embodiments of the present application can be implemented.

[0083] According to an embodiment of the present application, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In an embodiment of the present application, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, an apparatus, or a device. For example, according to an embodiment of the present application, the computer-readable storage medium may include one or more memories other than the ROM 1002 and / or RAM 1003 described above.

[0084] It should be noted that the functional modules in the various embodiments of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product.

[0085] The flowchart and / or block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flowchart and / or block diagram can represent a part of a module, program segment or code, and a part of the above-mentioned module, program segment or code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. It should also be noted that each box in the block diagram or flowchart, and the combination of the boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0086] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present application. In particular, without departing from the spirit and teachings of the present application, the technical features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways, and all of these combinations and / or combinations fall within the scope of the present application.

[0087] Although the present application has been shown and described with reference to specific exemplary embodiments of the present application, it should be understood by those skilled in the art that various changes in form and details may be made to the present application without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents. Therefore, the scope of the present application should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A blast furnace humidification humidity control method, characterized in that: include: Obtain a theoretical set value of steam flow rate according to the measured value of cold air flow rate, the set value of cold air humidity and the measured value of ambient atmospheric humidity; Based on the deviation between the cold air humidity measurement value and the cold air humidity setting value, obtaining a steam flow correction value; The steam flow rate correction value is used to correct the steam flow rate theoretical setting value to obtain a steam flow rate correction setting value; According to the steam flow corrected set value and the steam flow measurement value, a steam flow control output value is obtained for adjusting the steam flow.

2. The humidity control method according to claim 1, characterized in that: The formula for obtaining the theoretical set value of steam flow rate includes: F Steam_Cal_SP =(D Cair_SP -D Air_PV )*F Air_PV / 1000; Among them, D Cair_SP Indicates the cold air humidity setting value; D Air_PV Represents the measured value of the ambient atmospheric humidity; F Air_PV Indicates the measured value of the cold air flow rate; F Steam_Cal_SP Indicates the theoretical set value of the steam flow rate.

3. The humidity control method according to claim 2, characterized in that: The methods for obtaining the steam flow correction value include: Adopting PID control algorithm, inputting the cold air humidity measurement value and the cold air humidity setting value, and outputting the cold air humidity control output value; The steam flow correction value is obtained based on the cold air humidity control output value.

4. The humidity control method according to claim 3, characterized in that: The formula for obtaining the steam flow correction value based on the cold air humidity control output value includes: F Steam_Mod =(2*CV1-1)*δ; Wherein, CV1 represents the cold air humidity control output value; δ represents the flow correction threshold; F Steam_Mod Indicates the steam flow correction value.

5. The humidity control method according to claim 4, characterized in that: The formula for obtaining the corrected setpoint of steam flow is: F Steam_SP =F Steam_Cal_SP +F Steam_Mod ; Among them, F Steam_SP Indicates the corrected set value of the steam flow.

6. The humidity control method according to claim 5, characterized in that: The methods for obtaining the steam flow control output value include: A PID control algorithm is adopted, the steam flow rate correction set value and the steam flow rate measurement value are input, and the steam flow rate control output value is output.

7. The humidity control method according to any one of claims 1 to 6, characterized in that: The specific control methods for obtaining the steam flow control output value for adjusting the steam flow include: The steam flow rate is regulated by controlling the steam regulating valve opening based on the obtained steam flow control output value.

8. A blast furnace humidification control system, characterized in that: include: A flow calculator is used to obtain a theoretical steam flow setting value according to a cold air flow measurement value, a cold air humidity setting value and an ambient atmospheric humidity measurement value; A flow corrector, used to obtain a steam flow correction value based on a deviation between a cold air humidity measurement value and the cold air humidity setting value; and also used to correct the steam flow theoretical setting value using the steam flow correction value to obtain a steam flow corrected setting value; The steam flow regulator is used to obtain a steam flow control output value for regulating the steam flow according to the corrected set value of the steam flow and the measured value of the steam flow.

9. An electronic device, characterized in that: The method comprises at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit is enabled to perform the steps of the humidity control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that: It stores a computer program executable by an access authentication device. When the computer program runs on the access authentication device, the access authentication device can execute the steps of the humidity control method according to any one of claims 1 to 7.

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