A method and system for controlling the mixing and introduction of nitrogen and air in a dry quenching system

Abstract

This application relates to the field of dry quenching coke system control technology, specifically to a method and system for controlling the mixing and introduction of nitrogen and air in a dry quenching coke system. The dry quenching coke system includes a dry quenching coke oven, which is connected to a waste heat boiler and a circulating fan in sequence through a circulating gas pipeline to form a circulation loop. The annular flue of the dry quenching coke oven is connected to an inlet pipeline equipped with a nitrogen regulating valve and an air regulating valve. The method includes: continuously monitoring the CO volume concentration of the circulating gas at the inlet of the waste heat boiler, the inlet temperature of the waste heat boiler, and the speed of the circulating fan; inputting a dynamic control model, executing a split-range control strategy according to the temperature range, and calculating the recommended nitrogen and air inlet flow rates; and controlling the opening of the nitrogen regulating valve and the air regulating valve respectively to introduce nitrogen and air at the corresponding flow rates. This application can reduce the coke burn-off rate while ensuring that the CO concentration does not exceed the safety threshold, and at the same time avoid the high costs caused by excessive nitrogen consumption.

Description

Technical Field

[0001] This application relates to the field of dry quenching system control technology, specifically to a method and system for controlling the mixing and introduction of nitrogen and air in a dry quenching system. Background Technology

[0002] Dry quenching (CDQ) technology is a widely adopted energy-saving and environmentally friendly technology in the coking industry. Its principle involves using an inert circulating gas (mainly composed of N2) to exchange heat with red-hot coke in a closed system, thereby cooling the coke and recovering the high-temperature sensible heat for power generation. In the CDQ circulating gas, the volatilization of coke produces combustible components CO and H2. To ensure the safe operation of the CDQ system, the concentration of these combustible gases must be strictly controlled.

[0003] In existing technologies, the "air-introduction combustion method," which involves introducing air into the annular flue of the dry quenching furnace, is mainly used to control the concentration of combustible components CO and H2 in the circulating gas of the dry quenching coke system. This method introduces air into the annular flue of the dry quenching furnace, utilizing the oxygen in the air to burn off CO and H2. To improve the adjustment effect of the air introduction rate, existing technologies have added thermal gas mass flow meter measuring points to the air introduction pipeline and developed a real-time monitoring system for the burn-off rate visualization, which uses real-time calculation of burn-off rate parameters to assist in controlling the air introduction rate. In addition, some technologies have attempted to control the concentration of combustible gases by using nitrogen to dilute the gases.

[0004] However, the aforementioned existing technologies still have the following shortcomings: When using the air-introduced combustion method, if the amount of air introduced is too large, the excess oxygen after the combustible gas is burned off will directly react with the high-temperature coke in an oxidation reaction (2C + O2 = 2CO2), leading to direct coke burn-off. Simultaneously, the CO2 generated during combustion will react with the coke in a carbonization reaction (CO2 + C = 2CO) at temperatures above 730℃, further exacerbating burn-off. If the amount of air introduced is reduced, oxygen will preferentially react with the combustible gas, but existing technologies lack an effective method to precisely control the amount of air introduced to ensure effective combustion of the combustible gas without causing excessive oxidation. When using the pure nitrogen dilution method, a large amount of nitrogen is required to control the CO concentration below the safe threshold, resulting in high operating costs and poor economic efficiency. Furthermore, the adjustment of the air introduction amount in existing technologies mainly relies on manual experience, making it difficult to accurately match changes in production load, leading to large fluctuations in the CO content in the circulating gas and a persistently high coke burn-off rate, typically 1.2%-1.5%. Summary of the Invention

[0005] To address the technical problems of existing technologies using air-introduction combustion to control the concentration of combustible components in the circulating gas of dry quenching systems, where the air introduction rate relies on manual experience and is difficult to precisely match changes in production load, resulting in large fluctuations in CO content and persistently high coke burn-off rates across different temperature ranges, and the high operating costs associated with using pure nitrogen dilution methods, this application provides a nitrogen and air mixing and introduction control method and system for dry quenching systems. By continuously monitoring CO volume concentration, waste heat boiler inlet temperature, and circulating fan speed, a dynamic control model calculates the recommended introduction flow rates of nitrogen and air according to different control logics for each temperature range, and controls the opening of the nitrogen regulating valve and air regulating valve accordingly. This achieves automated dynamic coordinated control of the nitrogen and air introduction rates, reducing coke burn-off rates while ensuring that the CO concentration does not exceed the safety threshold, and avoiding the high costs associated with excessive nitrogen consumption.

[0006] In a first aspect, this application provides a method for controlling the mixing and introduction of nitrogen and air in a dry quenching coke system. The dry quenching coke system includes a dry quenching coke oven, which is connected in sequence to a waste heat boiler and a circulating fan via a circulating gas pipeline. The outlet of the circulating fan is connected to the return gas port of the dry quenching coke oven via a circulating gas pipeline. An annular flue is provided inside the dry quenching coke oven, which is connected to a nitrogen introduction pipeline and an air introduction pipeline respectively. A nitrogen regulating valve is provided on the nitrogen introduction pipeline, and an air regulating valve is provided on the air introduction pipeline. The method includes the following steps: S1. Continuously monitor the CO volume concentration in the dry quenching circulating gas at the boiler inlet of the dry quenching system. Waste heat boiler inlet temperature and circulating fan speed ; Among them, the boiler inlet dry quenching circulating gas is the circulating gas at the waste heat boiler inlet of the dry quenching system. S2. Real-time data collection , and Input a dynamic control model, output a recommended nitrogen import flow rate. Recommended airflow ; Among them, the dynamic control model is based on The temperature range in which it operates is subject to a split-range control strategy. Different control logic calculations are used for different temperature ranges. and ; S3. Execute mixed import control, according to and Control the opening of the nitrogen regulating valve and air regulating valve in the dry quenching system to introduce nitrogen and air of corresponding flow rates into the annular flue of the dry quenching oven.

[0007] In step S1, by continuously acquiring three parameters online—CO volume concentration, waste heat boiler inlet temperature, and circulating fan speed—the dynamic control model makes trend judgment and rate calculation based on continuous time series rather than isolated point values, ensuring that the frequency of control command updates matches the response requirements of changes in operating conditions. Step S2 involves inputting the real-time collected CO volume concentration, waste heat boiler inlet temperature, and circulating fan speed into the dynamic control model. The model then divides the operating conditions into independent control intervals based on the temperature. Within each temperature interval, the calculation parameters and algorithm structure for nitrogen and air are independently configured, so that the control gain and response characteristics of each interval are individually tuned for the physicochemical characteristics of that interval, achieving fine coverage of each temperature range. Step S3 sends independent opening control signals to the two regulating valves respectively by calculating the recommended flow rates of nitrogen and air based on the dynamic control model. This allows nitrogen to be precisely controlled according to dilution compensation requirements and air to be precisely controlled according to combustion consumption requirements. The two gases are independently regulated before entering the annular flue, but after mixing, they work together to regulate the composition of the circulating gas, thus achieving a precise conversion from theoretical calculation values ​​to actual physical flow rates.

[0008] It should be further explained that in step S2, the dynamic control model is in ≤600℃, 600℃< <800℃ and The three temperature ranges ≥800℃ each use different and Computational logic.

[0009] By dividing the temperature range into three zones—≤600℃, 600℃-800℃, and ≥800℃—corresponding to the low-temperature zone where oxidation reactions are kinetically limited, the medium-temperature transition zone with moderate reaction rates, and the high-temperature zone where carbon dissolution reactions are intense, the different gains of CO generation on the amount of air added in the three zones are matched separately, ensuring the stability and response speed of the control system across the entire temperature range.

[0010] It should be further explained that when At ≤600℃, and The calculation logic is as follows:

[0011]

[0012] in, This is the preset basic air intake volume for the low-temperature zone; The production load factor is calculated using the following formula:

[0013] This refers to the rated speed of the circulating fan; This is the preset low-temperature zone ratio coefficient; This is the preset minimum nitrogen introduction amount for the low-temperature zone; The formula for calculating CO concentration deviation is:

[0014] This is the preset safe threshold for CO concentration.

[0015] It should be further explained that, The value range is 5.5% to 6.5%; The value range is 4000~6000 m 3 / h; The value range is 150000~250000 m 3 / h; The value range is 300~700 m 3 / h.

[0016] By limiting the amount of air introduced into the low-temperature zone to a preset baseline value multiplied by the production load factor, and by using the CO concentration deviation only to drive the proportional adjustment of nitrogen flow rate rather than the adjustment of air flow rate, the system prioritizes increasing nitrogen dilution rather than increasing air introduction when CO exceeds the standard. This avoids ineffective burn-off caused by excessive air directly contacting coke in the low-temperature zone, thus achieving a safety control strategy of "dilution as the main method and combustion as the auxiliary method" in the low-temperature zone.

[0017] It should be further noted that when 600℃ < At temperatures below 800℃, a PID controller is used to calculate the control output value. and based on calculate and ,in: PID controller The input is set to 0, and the output controls the output value. , Dimensionless; The output equation of the PID controller is:

[0018] in, and All values ​​are used in the calculation, retaining their original positive or negative signs, while ignoring their physical units; This is the preset proportional coefficient for the medium temperature range; This is the preset integral coefficient for the mid-temperature range; The integral term is approximated using the trapezoidal integral method, and the initial value of the integral is 0. These are the preset differential coefficients for the mid-temperature range; and The calculation logic is as follows: like ,but:

[0019]

[0020] in This is the preset basic nitrogen input amount for the medium temperature zone; This is the preset nitrogen flow rate scaling factor; This is the preset basic air intake volume for the medium temperature zone; like ,but:

[0021]

[0022] in, This is the preset minimum nitrogen introduction amount for the medium temperature zone.

[0023] It should be further explained that, The value range is 30~70; The value range is 0.05 to 0.15; The value range is 5 to 15; The value range is 1500~2500 m 3 / h; The value range is 3000~7000 m 3 / h; The value range is 5000~7000 m 3 / h; The value range is 300~700 m 3 / h.

[0024] By employing a PID controller in the mid-temperature zone with CO concentration deviation as input and a setpoint of 0, the controller utilizes a proportional term to provide an immediate response to the current deviation, an integral term to eliminate static errors and allow the CO concentration to steadily return to the setpoint, and a derivative term to predict trends based on the rate of deviation change and output an advance correction to suppress sudden increases. Furthermore, the controller determines whether to prioritize increasing or decreasing nitrogen gas based on the sign of the output value. This achieves a balance between rapid response and precise convergence of CO concentration in the mid-temperature zone.

[0025] It should be further explained that, At ≥800℃, and The calculation logic is as follows:

[0026]

[0027] in, This is the preset base air intake for the high-temperature zone; The formula for calculating the air compensation amount is:

[0028] This is the preset compensation coefficient; The rate of increase in CO concentration is calculated using the following formula:

[0029] The sampling period; This is the preset high-temperature zone ratio coefficient; This is the preset minimum nitrogen introduction amount for the high-temperature zone.

[0030] By introducing an air compensation amount proportional to the rate of increase in CO concentration into the calculation of air introduction in the high-temperature zone, and using the derivative information of CO concentration with respect to time to predict future trends, the air introduction amount can be increased in advance when CO rises rapidly, so as to add oxygen for combustion in advance instead of waiting for the CO concentration to accumulate and exceed the standard before taking action. The control action is changed from a reactive response to a trend prediction, which realizes a rapid response and effective suppression of the sudden rise in CO concentration in the high-temperature zone.

[0031] It should be further explained that, The value range is 7000~9000 m 3 / h; The value range is 300,000 to 700,000 m. 3·s / h; The value range is 5-10s; The value range is 100000~200000 m 3 / h; The value range is 700~1300 m 3 / h.

[0032] It should be further noted that step S3 also includes, after the mixed import control, according to The feedback value is used to perform closed-loop optimization, specifically including: like Then, execute steps S2-S3 again; like and If the percentage is %, then the current nitrogen and air input rates will remain unchanged; like and If the percentage is %, then gradually reduce the air intake, decreasing by 100 m each time. 3 / h, until The air intake volume will be reduced to 80% of the baseline value for the air intake volume corresponding to the current temperature range. in, The preset CO concentration safety threshold; The baseline air intake value for temperatures ≤600℃ is the preset baseline air intake value for the low-temperature zone. ; 600℃ < The baseline value for air intake at temperatures below 800℃ is the preset baseline air intake for the mid-temperature zone. ; The baseline value for air intake at ≥800℃ is the preset baseline air intake for the high-temperature zone. .

[0033] After the mixed-introduction control is completed, three response branches are set based on the measured CO concentration: when the concentration exceeds the safety threshold, the entire calculation process is re-executed to ensure that the control strategy is reconstructed as a whole rather than patched when the concentration exceeds the limit significantly; when the concentration is between 5.5% and the safety threshold, the valve opening is maintained to avoid frequent adjustments that introduce system oscillations; and when the concentration is below 5.5%, the valve opening is adjusted in increments of 100 m. 3 The system actively reduces the amount of air introduced in small increments of / h until the concentration rises back to or drops to 80% of the baseline value, achieving dynamic minimization of the amount of air introduced while ensuring safety.

[0034] Secondly, this application provides a nitrogen and air mixing and introduction control system for a dry quenching system, used to implement the above-mentioned nitrogen and air mixing and introduction control method, including: The data acquisition module is used to continuously monitor the CO volume concentration in the dry quenching circulating gas at the boiler inlet of the dry quenching system. Waste heat boiler inlet temperature and circulating fan speed ; We recommend importing the traffic generation module to generate real-time traffic data. , and Input a dynamic control model, output a recommended nitrogen import flow rate. Recommended airflow ; The mixed import control module is used to execute mixed import control, based on... and Control the opening of the nitrogen regulating valve and air regulating valve in the dry quenching system to introduce nitrogen and air of corresponding flow rates into the annular flue of the dry quenching oven.

[0035] Thirdly, this application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described nitrogen and air mixing and introduction control method.

[0036] Fourthly, this application provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the above-described nitrogen and air mixing and introduction control method.

[0037] As can be seen from the above technical solutions, this application has the following advantages: 1. This application establishes a circulating loop by connecting a dry quenching coke oven to a waste heat boiler and a circulating fan via a circulating gas pipeline. The annular flue is connected to inlet pipelines equipped with nitrogen and air regulating valves. The CO volume concentration at the waste heat boiler inlet, the waste heat boiler inlet temperature, and the circulating fan speed are continuously monitored. The opening of the two regulating valves is calculated and controlled separately, enabling automated dynamic coordinated control of nitrogen and air inlet amounts. This eliminates reliance on manual experience and allows the inlet amount to be adjusted synchronously in real time according to changes in production load, significantly narrowing the fluctuation range of CO content in the circulating gas.

[0038] 2. This application uses a dynamic control model to calculate and output recommended nitrogen and air flow rates based on real-time monitoring of CO volume concentration, waste heat boiler inlet temperature, and circulating fan speed. Simultaneously, it implements a split-range control strategy based on the temperature range of the waste heat boiler inlet temperature, employing different control logics to calculate the recommended nitrogen and air flow rates for different temperature ranges. This significantly reduces coke burn-off rate while ensuring CO concentration does not exceed the safety threshold, avoiding high operating costs caused by excessive nitrogen consumption. Furthermore, it allows the control methods for each temperature range to match actual operating conditions, achieving fine adjustment across the entire temperature range. Detailed Implementation

[0039] To make the purpose, features, and advantages of this application more apparent and understandable, specific embodiments will be used below to clearly and completely describe the technical solution protected by this application. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] The nitrogen and air mixing and introduction control method of this application will be described in detail below. Specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details.

[0041] In the nitrogen and air mixing control method disclosed in this application, the term "comprising" indicates the presence of the described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0042] To facilitate a clear description of the technical solutions of this application, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" do not necessarily imply that they are different.

[0043] The terms "one embodiment" or "some embodiments" used in this application mean that one or more embodiments of this application include the specific features, structures, or characteristics described in that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this application do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0044] The technical solutions in the embodiments of this application will be clearly and completely described below.

[0045] The nitrogen and air mixing and introduction control method provided in this application embodiment is executed by a computer device. Correspondingly, the nitrogen and air mixing and introduction control system of the dry quenching system operates in the computer device.

[0046] Example 1 A method for controlling the mixing and introduction of nitrogen and air in a dry quenching coke system is disclosed. The dry quenching coke system includes a dry quenching coke oven, which is connected in sequence to a waste heat boiler and a circulating fan via a circulating gas pipeline. The outlet of the circulating fan is connected to the return gas port of the dry quenching coke oven via the circulating gas pipeline. An annular flue is provided inside the dry quenching coke oven, which is connected to a nitrogen introduction pipeline and an air introduction pipeline respectively. A nitrogen regulating valve is provided on the nitrogen introduction pipeline, and an air regulating valve is provided on the air introduction pipeline. The method includes the following steps: S1. Continuously monitor the CO volume concentration in the dry quenching circulating gas at the boiler inlet of the dry quenching system. Waste heat boiler inlet temperature and circulating fan speed ; Among them, the boiler inlet dry quenching circulating gas is the circulating gas at the waste heat boiler inlet of the dry quenching system. , and All based on sampling period Synchronous data is collected at a frequency of 10 seconds. S2. Real-time data collection , and Input a dynamic control model, output a recommended nitrogen import flow rate. Recommended airflow ; Among them, the dynamic control model is based on The temperature range in which it operates is subject to a split-range control strategy. Different control logic calculations are used for different temperature ranges. and ; when At ≤600℃, and The calculation logic is as follows:

[0047]

[0048] in, This is the preset basic air intake volume for the low-temperature zone. =5000m 3 / h; The production load factor is calculated using the following formula:

[0049] This refers to the rated speed of the circulating fan. =1000rpm; This is the preset low-temperature zone ratio coefficient. =200000m 3 / h; This is the preset minimum nitrogen introduction amount for the low-temperature zone. =500m 3 / h; The formula for calculating CO concentration deviation is:

[0050] The preset safe threshold for CO concentration, =6.0%; When 600℃ < At temperatures below 800℃, a PID controller is used to calculate the control output value. and based on calculate and ,in: PID controller The input is set to 0, and the output controls the output value. , Dimensionless; The output equation of the PID controller is:

[0051] in, and All values ​​are used in the calculation, retaining their original positive or negative signs, while ignoring their physical units; This is the preset medium temperature range proportional coefficient. =50; This is the preset integral coefficient for the mid-temperature range. =0.1; The integral term is approximated using the trapezoidal integral method, and the initial value of the integral is 0. The preset differential coefficients for the mid-temperature range. =10; and The calculation logic is as follows: like ,but:

[0052]

[0053] in This is the preset basic nitrogen input amount for the intermediate temperature zone. =2000m 3 / h; This is the preset nitrogen flow rate scaling factor. =5000m 3 / h; The preset basic air intake volume for the medium temperature zone =6000m 3 / h; like ,but:

[0054]

[0055] in, This is the preset minimum nitrogen introduction amount for the intermediate temperature zone. =500 m 3 / h; At ≥800℃, and The calculation logic is as follows:

[0056]

[0057] in, This is the preset basic air intake volume for the high-temperature zone. =8000 m3 / h; The formula for calculating the air compensation amount is:

[0058] The preset compensation coefficient, =500000 m 3 ·s / h; The rate of increase in CO concentration is calculated using the following formula:

[0059] The sampling period is =10s; This is the preset high-temperature zone ratio coefficient. =150000m 3 / h; This is the preset minimum nitrogen introduction amount for the high-temperature zone. =1000 m 3 / h; S3. Execute mixed import control, according to and Control the opening of the nitrogen regulating valve and air regulating valve in the dry quenching system to introduce nitrogen and air of corresponding flow rates into the annular flue of the dry quenching oven. After the mixed import control, according to The feedback value is used to perform closed-loop optimization, specifically including: like Then, execute steps S2-S3 again; like and If the percentage is %, then the current nitrogen and air input rates will remain unchanged; like and If the percentage is %, then gradually reduce the air intake, decreasing by 100 m each time. 3 / h, until The air intake volume will be reduced to 80% of the baseline value for the air intake volume corresponding to the current temperature range. in, The preset CO concentration safety threshold; The baseline air intake value for temperatures ≤600℃ is the preset baseline air intake value for the low-temperature zone. ; 600℃ < The baseline value for air intake at temperatures below 800℃ is the preset baseline air intake for the mid-temperature zone. ; The baseline value for air intake at ≥800℃ is the preset baseline air intake for the high-temperature zone. .

[0060] Comparative Example 1 A gas introduction control method for a dry quenching system, using the same dry quenching system as in Example 1, with the nitrogen introduction valve closed, only air introduction combustion is used for control, and the operator manually adjusts the opening of the air introduction valve based on experience to control the CO concentration to not exceed the safe threshold.

[0061] Comparative Example 2 A gas introduction control method for a dry quenching system, using the same dry quenching system as in Example 1, closes the air introduction valve and only introduces nitrogen for dilution control. The operator manually adjusts the opening of the nitrogen introduction valve based on experience to control the CO concentration to not exceed the safe threshold.

[0062] The average data from Example 1 and Comparative Examples 1-2 after one month of stable operation are as follows: In Example 1, the average coke burn-off rate was 0.96%, the CO content fluctuated within ±0.4%, no alarm was triggered for CO concentration exceeding the safety threshold, and the average nitrogen consumption was 2500 m3 / h. The average coke burn-off rate of Comparative Example 1 was 1.43%, and the CO content fluctuated within ±1.5%. The average coke burn-off rate of Comparative Example 2 was 0.85%, and the CO content fluctuated within a range of ±0.3%, but the average nitrogen consumption was as high as 7000 m3 / h, and the annual nitrogen cost increased by about 3 million yuan compared with the Example.

[0063] It can be seen that the burn loss rate of Example 1 was reduced by 0.47% compared with Comparative Example 1. Based on an annual coke production of 600,000 tons, this is equivalent to a reduction of approximately 2,820 tons of coke burn loss per year. At the same time, the CO content fluctuation range of Example 1 was significantly narrowed compared with Comparative Example 1, indicating that its control precision was significantly better than that of Comparative Example 1, which relied on human experience. Although the burn-off rate of the embodiment was slightly higher than that of Comparative Example 2 (about 0.11% higher), the nitrogen consumption was only about 35.7% of that of Comparative Example 2, saving about RMB3 million in nitrogen costs per year, which has a significant economic advantage.

[0064] The following are embodiments of the nitrogen and air mixing and introduction control system for the dry quenching system provided in this application. The nitrogen and air mixing and introduction control system of the dry quenching system belongs to the same inventive concept as the nitrogen and air mixing and introduction control method of Embodiment 1. For details not described in detail in the embodiments of the nitrogen and air mixing and introduction control system, please refer to the embodiments of the nitrogen and air mixing and introduction control method of the dry quenching system described above.

[0065] In this embodiment, the nitrogen and air mixing and introduction control system of the dry quenching system includes: The data acquisition module is used to continuously monitor the CO volume concentration in the dry quenching circulating gas at the boiler inlet of the dry quenching system. Waste heat boiler inlet temperature and circulating fan speed ; We recommend importing the traffic generation module to generate real-time traffic data. , and Input a dynamic control model, output a recommended nitrogen import flow rate. Recommended airflow ; The mixed import control module is used to execute mixed import control, based on... and Control the opening of the nitrogen regulating valve and air regulating valve in the dry quenching system to introduce nitrogen and air of corresponding flow rates into the annular flue of the dry quenching oven.

[0066] The nitrogen and air mixing and introduction control system of this embodiment is used to realize the nitrogen and air mixing and introduction control method of dry quenching system.

[0067] This application also provides an electronic device for implementing various embodiments of this application, the electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor.

[0068] Those skilled in the art will understand that the electronic device structure involved in the embodiments of this application does not constitute a limitation on the electronic device. The electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0069] In embodiments of this application, electronic devices include, but are not limited to, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices may also represent various forms of mobile devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of this application described and / or claimed herein.

[0070] In this application embodiment, the processor can be implemented using at least one of an Application-Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a processor, a controller, a microcontroller, a microprocessor, or an electronic unit designed to perform the functions described herein. In some cases, such implementations can be implemented within a controller. For software implementations, implementations such as processes or functions can be implemented with separate software modules that allow the performance of at least one function or operation. The software code can be implemented by a software application (or program) written in any suitable programming language, and the software code can be stored in memory and executed by the controller.

[0071] In addition, the electronic device includes some functional modules not shown, which will not be described in detail here.

[0072] Those skilled in the art will understand that the various aspects of the electronic device provided in this application can be implemented as a system, method, or program product. Therefore, the various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software aspects, collectively referred to herein as a "circuit," "module," or "system."

[0073] This application also provides a storage medium storing a program product capable of implementing a nitrogen and air mixing control method for a dry quenching system. In some possible embodiments, various aspects of this application can also be implemented as a program product comprising program code that, when run on a terminal device, causes the terminal device to perform the steps described in the "Exemplary Methods" section of this specification according to various exemplary embodiments of this application.

[0074] The storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example,, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the mixing and introduction of nitrogen and air in a dry quenching system, characterized in that, The dry quenching system includes a dry quenching oven, which is connected to a waste heat boiler and a circulating fan in sequence through a circulating gas pipeline. The outlet of the circulating fan is connected to the return gas port of the dry quenching oven through a circulating gas pipeline. An annular flue is installed inside the dry quenching oven, which is connected to a nitrogen inlet pipeline and an air inlet pipeline respectively. A nitrogen regulating valve is installed on the nitrogen inlet pipeline, and an air regulating valve is installed on the air inlet pipeline. The method includes the following steps: S1. Continuously monitor the CO volume concentration in the dry quenching circulating gas at the boiler inlet of the dry quenching system. Waste heat boiler inlet temperature and circulating fan speed ; Among them, the boiler inlet dry quenching circulating gas is the circulating gas at the waste heat boiler inlet of the dry quenching system. S2. Real-time data collection , and Input a dynamic control model, output a recommended nitrogen import flow rate. Recommended airflow ; Among them, the dynamic control model is based on The temperature range in which it operates is subject to a split-range control strategy. Different control logic calculations are used for different temperature ranges. and ; S3. Execute mixed import control, according to and Control the opening of the nitrogen regulating valve and air regulating valve in the dry quenching system to introduce nitrogen and air of corresponding flow rates into the annular flue of the dry quenching oven.

2. The method as described in claim 1, characterized in that, In step S2, the dynamic control model is in ≤600℃, 600℃< <800℃ and The three temperature ranges ≥800℃ each use different and Computational logic.

3. The method as described in claim 2, characterized in that, when At ≤600℃, and The calculation logic is as follows: in, This is the preset basic air intake volume for the low-temperature zone; The production load factor is calculated using the following formula: This refers to the rated speed of the circulating fan; This is the preset low-temperature zone ratio coefficient; This is the preset minimum nitrogen introduction amount for the low-temperature zone; The formula for calculating CO concentration deviation is: This is the preset safe threshold for CO concentration.

4. The method as described in claim 3, characterized in that, The value range is 5.5% to 6.5%; The value range is 4000~6000 m 3 / h; The value range is 150000~250000 m 3 / h; The value range is 300~700 m 3 / h.

5. The method as described in claim 2, characterized in that, When 600℃ < At temperatures below 800℃, a PID controller is used to calculate the control output value. and based on calculate and ,in: PID controller The input is set to 0, and the output controls the output value. , Dimensionless; The output equation of the PID controller is: in, and All values ​​are used in the calculation, retaining their original positive or negative signs, while ignoring their physical units; This is the preset proportional coefficient for the medium temperature range; This is the preset integral coefficient for the mid-temperature range; The integral term is approximated using the trapezoidal integral method, and the initial value of the integral is 0. These are the preset differential coefficients for the mid-temperature range; and The calculation logic is as follows: like ,but: in This is the preset basic nitrogen input amount for the medium temperature zone; This is the preset nitrogen flow rate scaling factor; This is the preset basic air intake volume for the medium temperature zone; like ,but: in, This is the preset minimum nitrogen introduction amount for the medium temperature zone.

6. The method as described in claim 5, characterized in that, The value range is 30~70; The value range is 0.05 to 0.15; The value range is 5 to 15; The value range is 1500~2500 m 3 / h; The value range is 3000~7000 m 3 / h; The value range is 5000~7000 m 3 / h; The value range is 300~700 m 3 / h.

7. The method as described in claim 2, characterized in that, when At ≥800℃, and The calculation logic is as follows: in, This is the preset base air intake for the high-temperature zone; The formula for calculating the air compensation amount is: This is the preset compensation coefficient; The rate of increase in CO concentration is calculated using the following formula: The sampling period; This is the preset high-temperature zone ratio coefficient; This is the preset minimum nitrogen introduction amount for the high-temperature zone.

8. The method as described in claim 7, characterized in that, The value range is 7000~9000 m 3 / h; The value range is 300,000 to 700,000 m. 3 ·s / h; The value range is 5-10s; The value range is 100000~200000 m 3 / h; The value range is 700~1300 m 3 / h.

9. The method as described in claim 1, characterized in that, Step S3 also includes, after the mixed import control, according to The feedback value is used to perform closed-loop optimization, specifically including: like Then, execute steps S2-S3 again; like and If the percentage is %, then the current nitrogen and air input rates will remain unchanged; like and If the percentage is %, then gradually reduce the air intake, decreasing by 100 m each time. 3 / h, until The air intake volume will be reduced to 80% of the baseline value for the air intake volume corresponding to the current temperature range. in, The preset CO concentration safety threshold; The baseline air intake value for temperatures ≤600℃ is the preset baseline air intake value for the low-temperature zone. ; 600℃ < The baseline value for air intake at temperatures below 800℃ is the preset baseline air intake for the mid-temperature zone. ; The baseline value for air intake at ≥800℃ is the preset baseline air intake for the high-temperature zone. .

10. A nitrogen and air mixing and introduction control system for a dry quenching system, characterized in that, A method for controlling the introduction of nitrogen and air mixture as described in any one of claims 1-9, comprising: The data acquisition module is used to continuously monitor the CO volume concentration in the dry quenching circulating gas at the boiler inlet of the dry quenching system. Waste heat boiler inlet temperature and circulating fan speed ; We recommend importing the traffic generation module to generate real-time traffic data. , and Input a dynamic control model, output a recommended nitrogen import flow rate. Recommended airflow ; The mixed import control module is used to execute mixed import control, based on... and Control the opening of the nitrogen regulating valve and air regulating valve in the dry quenching system to introduce nitrogen and air of corresponding flow rates into the annular flue of the dry quenching oven.

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