Intelligent control methods and related equipment for carbon dioxide capture in coal gas

Abstract

This application discloses an intelligent control method and related equipment for coal gas carbon dioxide capture, relating to the field of steel production technology. The method includes: acquiring detection data from a coal gas carbon dioxide capture device; determining the balance state and operating efficiency of the coal gas carbon dioxide capture device based on the detection data; and adjusting the parameter settings of the coal gas carbon dioxide capture device based on the balance state and operating efficiency. This application ensures efficient and stable operation, improves the capture rate, optimizes energy consumption distribution, and enhances equipment reliability and service life by real-time monitoring and intelligent control of the operating parameters of the coal gas carbon dioxide capture device.

Description

Technical Field

[0001] This application relates to the field of steel production technology, and more specifically, to a method and related equipment for intelligent control of carbon dioxide capture in coal gas. Background Technology

[0002] With increasingly stringent requirements for industrial production and environmental protection, coal gas carbon dioxide capture technology has been widely applied in industries such as steel, chemicals, and power to reduce greenhouse gas emissions and improve the efficiency of carbon resource recovery and utilization. However, the complex operating conditions of coal gas carbon dioxide capture equipment make precise monitoring and control of its operating status particularly crucial. Therefore, optimizing the operating parameters of coal gas carbon dioxide capture equipment to ensure efficient and stable system operation has become an important direction for technological research and development.

[0003] In existing technologies, intelligent control methods for coal gas carbon dioxide capture mostly rely on fixed parameter settings or manual experience adjustments, lacking a closed-loop feedback mechanism for the dynamic absorption-desorption process. For example, when coal gas composition fluctuates or equipment load changes, traditional methods cannot build a control model based on real-time monitoring data, resulting in delayed parameter adjustments and a lack of systematic optimization logic, making it difficult to achieve coordinated control of absorption efficiency and desorption energy consumption. This traditional approach cannot fully consider the impact of factors such as the state of the absorption solution, temperature changes, and fluctuations in coal gas composition on capture efficiency, making it difficult to maintain optimal equipment operation over long periods, leading to high energy consumption and potential system instability due to unreasonable parameter settings. Furthermore, insufficient energy consumption optimization during the desorption process affects the efficient separation and recovery of carbon dioxide. In other words, related technologies suffer from insufficient monitoring of the operating status of coal gas carbon dioxide capture equipment and inaccurate parameter adjustments, resulting in difficulties in ensuring system stability and efficiency. Summary of the Invention

[0004] The summary section of this application introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The intelligent control method and related equipment for capturing carbon dioxide from coal gas provided in this application can ensure efficient and stable operation, improve the capture rate, optimize energy consumption distribution, and enhance equipment reliability and service life by real-time monitoring and intelligent control of the operating parameters of the coal gas carbon dioxide capture equipment.

[0006] In a first aspect, this application provides an intelligent control method for capturing carbon dioxide from coal gas, comprising: acquiring detection data of a coal gas carbon dioxide capture device, wherein the detection data includes the state of the absorption solution, the temperature of the absorption tower, the concentration of carbon dioxide in the coal gas before absorption, the concentration of carbon dioxide in the coal gas after absorption, the state of the buffer solution, the state of the desorption solution, the temperature of the desorption tower, and the purity of carbon dioxide after desorption; determining the balance state and working efficiency of the coal gas carbon dioxide capture device based on the detection data; and adjusting the parameter settings of the coal gas carbon dioxide capture device based on the balance state and the working efficiency.

[0007] In some embodiments, the process of determining the equilibrium state includes: predicting the equilibrium state using real-time data trends of the state of the absorption solution, the temperature of the absorption tower, the state of the desorption solution, and the temperature of the desorption tower.

[0008] In some embodiments, the process of determining the equilibrium state includes: when the detected difference between the carbon dioxide concentration of the absorbed gas and the preset target concentration is greater than the preset difference for a first preset time, or when the purity of the carbon dioxide after analysis is less than the preset purity for a second preset time, the equilibrium state is determined to be unbalanced.

[0009] In some embodiments, the process of determining the working efficiency includes: determining the absorption efficiency of the gas carbon dioxide capture device based on a first difference between the temperature of the absorption tower and the temperature of the desorption tower, and a second difference between the carbon dioxide concentration of the gas before absorption and the carbon dioxide concentration of the gas after absorption; determining the desorption efficiency of the gas carbon dioxide capture device based on the purity of the carbon dioxide after desorption and the temperature of the desorption tower; and determining the working efficiency based on the absorption efficiency and the desorption efficiency.

[0010] In some embodiments, the parameter settings include the desorption heating temperature setting, the absorption module outlet flow rate setting, and the desorption module inlet flow rate setting; adjusting the parameter settings of the gas carbon dioxide capture device according to the balance state and the working efficiency includes: when the balance state is unbalanced and the working efficiency is greater than or equal to a preset efficiency, performing a state correction operation, wherein the state correction operation includes at least one of increasing the absorption module outlet flow rate setting, decreasing the desorption module inlet flow rate setting, and increasing the desorption module heating temperature setting.

[0011] In some embodiments, the parameter settings include the absorption solution circulation pump speed setting, the desorption tower pressure setting, and the solution pH setting; adjusting the parameter settings of the gas carbon dioxide capture device according to the equilibrium state and the working efficiency includes: when the equilibrium state is balanced and the working efficiency is less than the preset efficiency, performing an efficiency correction operation, wherein the efficiency correction operation includes at least one of increasing the absorption solution circulation pump speed setting, increasing the desorption tower pressure setting, and adjusting the solution pH setting.

[0012] In some embodiments, adjusting the parameter settings of the gas carbon dioxide capture device based on the balance state and the operating efficiency includes: generating an execution request to adjust the parameter settings of the gas carbon dioxide capture device based on the balance state and the operating efficiency; and adjusting the parameter settings of the gas carbon dioxide capture device when the execution request is confirmed.

[0013] Secondly, this application also provides an intelligent control device for capturing carbon dioxide from coal gas, comprising: a detection data acquisition unit for acquiring detection data from a coal gas carbon dioxide capture device, wherein the detection data includes the state of the absorption solution, the temperature of the absorption tower, the concentration of carbon dioxide in the coal gas before absorption, the concentration of carbon dioxide in the coal gas after absorption, the state of the buffer solution, the state of the desorption solution, the temperature of the desorption tower, and the purity of carbon dioxide after desorption; an equipment state determination unit for determining the balance state and working efficiency of the coal gas carbon dioxide capture device based on the detection data; and an equipment parameter adjustment unit for adjusting the parameter settings of the coal gas carbon dioxide capture device based on the balance state and the working efficiency.

[0014] Thirdly, this application also provides an electronic device, including: a memory and a processor, wherein the processor is configured to execute a computer program stored in the memory to implement the steps of the intelligent control method for capturing carbon dioxide in coal gas as described in the first aspect.

[0015] Fourthly, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the intelligent control method for capturing carbon dioxide in coal gas as described in the first aspect.

[0016] Fifthly, this application also provides a computer program product, including a computer program or computer-executable instructions, which, when executed by a processor, implement the intelligent control method for capturing carbon dioxide in coal gas provided in the embodiments of this application.

[0017] In summary, this application, by acquiring key parameters such as the states of the absorption solution, buffer solution, and desorption solution, as well as the temperatures of the absorption tower and desorption tower, can accurately determine the operating status of the coal gas carbon dioxide capture equipment. Through dynamic evaluation of the equilibrium state and operating efficiency, it can promptly identify and adjust system operating parameters, such as the flow rate and desorption temperature of the absorption and desorption modules, ensuring the coal gas carbon dioxide capture equipment operates at high efficiency. This not only improves the carbon dioxide capture rate but also optimizes energy consumption distribution and reduces unnecessary energy consumption. Employing an intelligent control method based on detection data, it can adaptively adjust the parameters of the coal gas carbon dioxide capture equipment, ensuring stable operation under different working conditions and reducing operational instability caused by changes in the external environment (such as fluctuations in coal gas composition or equipment aging), thereby improving equipment reliability and service life. In conclusion, the intelligent control method for coal gas carbon dioxide capture provided in this application ensures efficient and stable operation, improves the capture rate, optimizes energy consumption distribution, and enhances equipment reliability and service life by real-time monitoring and intelligent control of the operating parameters of the coal gas carbon dioxide capture equipment. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 A schematic flowchart of a smart control method for capturing carbon dioxide from coal gas provided in an embodiment of this application;

[0020] Figure 2 A schematic diagram of the composition structure of a coal gas carbon dioxide capture and control device provided in this application embodiment;

[0021] Figure 3 This is a schematic diagram of the composition structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0022] The terms used in the specification, claims, and drawings of this application, such as "first," "second," "third," "fourth," etc. (if any), are used to distinguish similar objects and not to describe a specific order or sequence. Therefore, it is to be understood that these terms can be used interchangeably where appropriate, allowing the described embodiments to be used in different orders, unless specifically required by the illustrations or description. Furthermore, the terms "is" and "has," and any variations thereof, are intended to cover, non-exclusively, all possible constituent elements. For example, a process, method, system, product, or apparatus comprising several steps or units is not necessarily limited to the steps or units explicitly listed, but may also include other steps or units not explicitly listed, or steps or units inherent to the process, method, product, or apparatus.

[0023] In this application, a "module" or "unit" refers to a computer program or part of a computer program that has a specific function and works in conjunction with other related parts to achieve a predetermined goal. These modules or units can be implemented by software, hardware (e.g., processing circuitry or memory), or a combination of both. One or more processors or memories can implement one or more modules or units. Furthermore, each module or unit can also be part of a larger module or unit.

[0024] The technical solutions of this application will be described in detail below with reference to the accompanying drawings of the embodiments. It should be noted that the described embodiments are only a part of this application, and not all embodiments. In the following description, the "some embodiments" mentioned are only a subset of all possible embodiments, which may be the same or different subsets, and different embodiments can be combined with each other without conflict.

[0025] Figure 1 This is a schematic flowchart of a smart control method for capturing carbon dioxide in coal gas provided in an embodiment of this application. For example, see [link to example]. Figure 1 The intelligent control method for capturing carbon dioxide from coal gas provided in this application embodiment may include the following steps 101 to 103:

[0026] Step 101: Obtain the detection data of the coal gas carbon dioxide capture equipment. The detection data may include the state of the absorption solution, the temperature of the absorption tower, the concentration of coal gas carbon dioxide before absorption, the concentration of coal gas carbon dioxide after absorption, the state of the buffer solution, the state of the desorption solution, the temperature of the desorption tower, and the purity of carbon dioxide after desorption.

[0027] In some examples, coal gas carbon dioxide capture equipment is an industrial device used to separate and recover carbon dioxide from coal gas. It typically includes core components such as an absorption tower, a stripping tower, a buffer module, and a circulating pump. The absorption tower absorbs and removes carbon dioxide from the coal gas using an absorbent solution. Through gas-liquid contact, a gas-liquid interface is formed within the absorption tower, allowing for effective absorption of carbon dioxide. The stripping tower releases the absorbed carbon dioxide from the absorbent solution. The stripping process typically involves heating the absorbent solution to increase its temperature, causing the carbon dioxide to desorb and concentrate within the stripping tower before being discharged. The buffer module regulates and controls the dynamic stability of the system, ensuring effective absorption and stripping of carbon dioxide. The circulating pump circulates the absorbent or stripping solution from one module to another, ensuring continuous flow and maintaining optimal reaction conditions. The equipment's operating status can be monitored using plant operating systems or sensors to obtain data. Coal gas includes not only blast furnace gas, converter gas, coke oven gas, direct reduction shaft furnace top gas, and gas produced by fluidized bed reduction technology in steel enterprises, but also carbon dioxide-containing gases from the power generation and coal industries. The state of the absorption solution refers to the status information of the chemical solution used to capture carbon dioxide (such as MEA, MDEA, PZ, etc.), including its level, volume, pH value, and temperature. The absorption tower temperature is the operating temperature inside the absorption tower, affecting the carbon dioxide absorption efficiency; it is usually controlled between 40℃ and 60℃ and can be obtained using temperature sensors such as thermocouples and thermistors. The carbon dioxide concentration in the gas before absorption is the amount of carbon dioxide in the gas before entering the absorption tower, usually expressed as a volume fraction (vol%), and is an important reference value for calculating the capture efficiency. It can be obtained using online gas analyzers, chromatographs, and online monitoring systems. The carbon dioxide concentration in the gas after absorption is the residual carbon dioxide content in the gas exiting the absorption tower, determining the capture rate. It can also be obtained using gas analyzers, chromatographs, and online monitoring systems. The state of the buffer solution is the state of the solution used to adjust the pH value of the absorption solution and balance the acidity and alkalinity of the system, including information such as the solution's level, volume, pH value, and temperature. The state of the desorption solution is the state of the chemical solution used to release carbon dioxide, including information such as its level, volume, pH value, and temperature, affecting the carbon dioxide desorption efficiency. The temperature of the stripping column refers to the operating temperature inside the column, typically maintained between 100℃ and 140℃, which affects the CO2 release efficiency from the solution. The purity of the carbon dioxide after stripping refers to the purity of the carbon dioxide at the stripping column outlet, which can be obtained using a gas chromatograph or an infrared carbon dioxide analyzer.

[0028] By implementing step 101, the state information of the absorption solution, buffer solution, and desorption solution, as well as key data such as the temperature of the absorption tower, the temperature of the desorption tower, and the carbon dioxide concentration of the coal gas are comprehensively collected. This can accurately reflect the operating status of the equipment and provide a reliable basis for subsequent judgment of the equipment's balance status and working efficiency, avoiding misjudgments caused by missing or incomplete data.

[0029] Step 102: Based on the detection data, determine the balance status and working efficiency of the gas carbon dioxide capture equipment;

[0030] In some examples, equilibrium state characterizes whether the absorption and desorption systems of a coal gas carbon dioxide capture device are in a stable working state during operation. This means whether the mass transfer between the absorption tower and the desorption tower is balanced, and whether the input, absorption, desorption, and emission of carbon dioxide remain within reasonable ranges. The equilibrium state can be "balanced" or "unbalanced." "Balanced" indicates stable equipment operation, with carbon dioxide capture and release efficiencies within the expected range. "Unbalanced" indicates equipment abnormalities, such as a lower-than-expected carbon dioxide capture rate or insufficient desorption efficiency, which may lead to reduced capture efficiency or increased energy consumption. For example, if the carbon dioxide concentration in the coal gas before absorption is 20%, and the concentration stabilizes at 2% after absorption, with a carbon dioxide purity of 99% after desorption, the coal gas carbon dioxide capture device is in equilibrium. If the carbon dioxide purity after desorption remains below 95% for a long period, and the absorption tower temperature fluctuates significantly, it may indicate solvent saturation or decreased desorption efficiency, indicating that the coal gas carbon dioxide capture device is in an unbalanced state. Operating efficiency is the ability of a coal gas carbon dioxide capture and desorption equipment to capture and desorb carbon dioxide per unit time during operation. It measures the performance and energy consumption of the equipment and can be calculated based on absorption efficiency (CO2 removal rate of the absorption tower) and desorption efficiency (CO2 release rate of the desorption tower).

[0031] By implementing step 102, comparing data such as the carbon dioxide concentration of the gas before and after absorption, the purity of carbon dioxide after desorption, as well as temperature and solution state, it is possible to accurately determine whether the equipment is in a balanced state. Furthermore, by combining the calculation of absorption efficiency and desorption efficiency, the working efficiency of the equipment can be quantified, avoiding adjustments based solely on experience or a single parameter. This provides a basis for subsequent parameter optimization, thereby improving the stability and reliability of the equipment.

[0032] Step 103: Adjust the parameter settings of the gas carbon dioxide capture equipment according to the balance status and working efficiency;

[0033] In some examples, parameter settings are key adjustable operating parameters during the operation of the coal gas carbon dioxide capture equipment. These parameters determine the efficiency and stability of processes such as absorption, desorption, and circulation. These parameters may include desorption heating temperature (affecting the carbon dioxide desorption rate), absorption module outlet flow rate (affecting solvent absorption capacity), desorption module inlet flow rate (affecting the carbon dioxide release efficiency of the desorption tower), absorption solution circulation pump speed (affecting the solvent circulation rate), desorption tower pressure (affecting the carbon dioxide separation effect), and solution pH value (affecting solvent activity and carbon dioxide capture capacity). Parameter settings can be intelligently adjusted based on the detected equipment operating status to ensure efficient and stable operation of the equipment.

[0034] In some examples, the intelligent control system of the gas carbon dioxide capture equipment consists of a three-layer architecture:

[0035] Sensing layer: Real-time data collection of parameters such as absorption tower temperature (±0.5℃ accuracy), desorption tower pressure (0-200kPa range), and solution pH value (0.1 resolution) is achieved through a distributed sensor network, with a data sampling frequency of 1 time / second;

[0036] Decision-making level: The embedded controller runs a dynamic control algorithm. When it detects that the CO2 concentration after absorption is >1.0%, it triggers a multivariate optimization model to calculate the absorption flow rate adjustment ΔQ=K_p*(C_actual-C_target)+K_i*∫(C_deviation)dt, where K_p=0.8 and Ki=0.2 are PID parameters;

[0037] Execution layer: The outlet flow rate of the absorption module is increased from 50m³ / h via an electric regulating valve (opening accuracy ±1%) and a frequency converter (speed control ±2rpm). 3 / h to 65m 3 The step response time of / h is <15 seconds.

[0038] For example, when fluctuations in blast furnace gas pressure cause a sudden increase in inlet flow, the system completes closed-loop control of data acquisition, model calculation, and valve adjustment within 5 seconds to maintain an absorption efficiency of >90%.

[0039] By implementing step 103, parameters are adjusted according to the real-time status of the equipment, ensuring that the equipment always operates within a high-efficiency range, thereby improving the carbon dioxide capture rate and reducing energy waste.

[0040] In summary, the embodiments of this application can accurately determine the operating status of the coal gas carbon dioxide capture equipment by acquiring key parameters such as the states of the absorption solution, buffer solution, and desorption solution, as well as the temperatures of the absorption tower and desorption tower. Through dynamic evaluation of the balance state and working efficiency, system operating parameters, such as the flow rate and desorption temperature of the absorption and desorption modules, can be promptly identified and adjusted, ensuring the coal gas carbon dioxide capture equipment remains in a highly efficient operating state. This not only improves the carbon dioxide capture rate but also optimizes energy consumption distribution and reduces unnecessary energy consumption. Employing an intelligent control method based on detection data, the parameters of the coal gas carbon dioxide capture equipment can be adaptively adjusted to ensure stable operation under different working conditions, reducing operational instability caused by changes in the external environment (such as fluctuations in coal gas composition or equipment aging), thereby improving equipment reliability and service life. In conclusion, the intelligent control method for coal gas carbon dioxide capture provided in the embodiments of this application ensures efficient and stable operation, improves the capture rate, optimizes energy consumption distribution, and enhances equipment reliability and service life by real-time monitoring and intelligent control of the operating parameters of the coal gas carbon dioxide capture equipment.

[0041] In some embodiments, the process of determining the aforementioned equilibrium state may include: predicting the equilibrium state using real-time data trends of the state of the absorption solution, the temperature of the absorption tower, the state of the desorption solution, and the temperature of the desorption tower.

[0042] In some examples, the real-time data trend of the absorption solution state refers to the change in parameters such as the liquid level, volume, pH value, and temperature of the chemical solution inside the absorption tower over time. For example, if the pH value of the absorption solution shows a continuous downward trend, it may mean that the carbon dioxide absorption is too large, which will soon lead to solvent deactivation. The real-time data trend of the absorption tower temperature refers to the change in temperature inside the absorption tower over time. The absorption process is an exothermic reaction; excessively high temperatures may reduce the absorption efficiency of carbon dioxide, while excessively low temperatures may lead to a decrease in absorption capacity. The real-time data trend of the desorption solution state refers to the change in parameters such as the liquid level, volume, pH value, and temperature of the chemical solution inside the desorption tower over time. The real-time data trend of the desorption tower temperature refers to the change in temperature inside the desorption tower over time. Time series analysis, pre-trained predictive models, and trend line fitting can be used to calculate the rate of change of parameters and their impact on the equilibrium state to determine whether the equipment is in equilibrium. For example, if the absorption tower temperature has been rising continuously and the solution pH value has been falling over the past 30 minutes, it can be predicted that the equipment is about to enter an unbalanced state, thus confirming the current equilibrium state as unbalanced.

[0043] By implementing the above embodiments, analyzing the real-time data trends of the absorption solution, the desorption solution, and the temperatures of the absorption tower and the desorption tower, the equilibrium state of the equipment can be predicted in advance, allowing the equipment to be adjusted before it deviates from the equilibrium, avoiding efficiency loss or energy waste due to delayed response, thereby improving the operational stability and intelligence level of the equipment.

[0044] In some embodiments, the process of determining the aforementioned equilibrium state may include: when the detected difference between the carbon dioxide concentration of the absorbed gas and the preset target concentration is greater than the preset difference for a first preset time, or when the purity of the carbon dioxide after analysis is less than the preset purity for a second preset time, the equilibrium state is determined to be unbalanced.

[0045] In some examples, the preset target concentration refers to the ideal value that the carbon dioxide concentration of the gas after absorption should reach under normal operating conditions. This value can be set based on process requirements or historical operating data. For example, if the target capture rate is 90%, and the carbon dioxide concentration of the gas before absorption is 20 vol%, then the carbon dioxide concentration of the gas after absorption should be set to 2 vol%. The detection difference refers to the numerical difference between the actual detected carbon dioxide concentration of the gas after absorption and the preset target concentration, reflecting whether the equipment deviates from the ideal state. For example, if the target concentration is 2 vol%, and the actual detected carbon dioxide concentration of the gas after absorption is 3.5 vol%, then the detection difference is 1.5 vol%. The preset difference is the maximum acceptable concentration deviation range. Exceeding this range indicates that the equipment may have entered an unbalanced state. The preset difference can be set by process engineers based on equipment characteristics, operating experience, or through historical data analysis. The first preset duration is the time threshold for when the detection difference continuously exceeds a preset value. If this time is exceeded, the equilibrium state is determined to be unbalanced to avoid misjudgment due to short-term fluctuations. The first preset duration can be set by the process engineer based on the equipment response speed, such as 5 minutes, 10 minutes, etc. For example, if the first preset duration is set to 10 minutes, and the detection difference (e.g., 1 vol%) is continuously greater than 0.5 vol% for 10 minutes, the equilibrium state is determined to be unbalanced. The preset purity is the minimum acceptable purity value of carbon dioxide after desorption. Below this value, it indicates a decrease in desorption efficiency, which may affect downstream carbon dioxide utilization or storage. The preset purity can be set with reference to industrial requirements or experimental data. The second preset duration is the duration for which the purity of carbon dioxide after desorption is lower than the preset purity. If this time is exceeded, the equilibrium state is determined to be unbalanced. This can be set by the process engineer based on the dynamic characteristics of the desorption tower, such as 5 minutes, 15 minutes, etc.

[0046] By implementing the above embodiments and adopting a clear threshold judgment method, the deviation between the carbon dioxide concentration of the absorbed gas and the target value, and the changing trend of the carbon dioxide purity after analysis, can accurately determine whether the equipment is in a balanced state. This avoids the drawbacks of relying solely on experience for adjustment, making the equipment status monitoring more quantitative and reliable. It also helps the equipment to respond quickly and make adjustments in abnormal conditions, thereby improving operational stability.

[0047] In some embodiments, the process of determining the aforementioned working efficiency may include: determining the absorption efficiency of the gas carbon dioxide capture device based on a first difference between the temperature of the absorption tower and the temperature of the desorption tower, and a second difference between the carbon dioxide concentration of the gas before absorption and the carbon dioxide concentration of the gas after absorption; determining the desorption efficiency of the gas carbon dioxide capture device based on the purity of the carbon dioxide after desorption and the temperature of the desorption tower; and determining the working efficiency based on the absorption efficiency and the desorption efficiency.

[0048] In some examples, the first difference refers to the temperature difference between the operating temperatures of the absorption tower and the desorption tower. This difference reflects the level of heat exchange and energy consumption, affecting the absorption and desorption of carbon dioxide. For example, if the absorption tower temperature is 50℃ and the desorption tower temperature is 120℃, then the first difference = 120℃ - 50℃ = 70℃. The second difference refers to the difference in carbon dioxide concentration of the gas before and after entering the absorption tower. This reflects the degree of carbon dioxide removal during the absorption process and is an important parameter for measuring absorption efficiency. For example, if the carbon dioxide concentration of the gas before absorption is 20 vol%, and the carbon dioxide concentration after absorption is 2 vol%, then the second difference is 18 vol%. Absorption efficiency refers to the ability of the absorption tower to remove carbon dioxide, which can be expressed by the formula η1 = [C 前 / (C 前 -C 后 )]×[1-α1×(ΔT-ΔT 最佳 ) 2 ]×100%, calculated as follows, where η1 is the absorption efficiency; C 前 It is the carbon dioxide concentration of the coal gas before absorption; C 后 It represents the carbon dioxide concentration in the coal gas after absorption; ΔT is the first difference; ΔT 最佳 To design the optimal temperature difference, such as -50℃, the temperature difference between the analytical and absorption towers should be 50℃ higher; α1 is the temperature influence coefficient, such as 0.0001 / ℃. 2 Desorption efficiency refers to the ability of a desorption column to release carbon dioxide from the absorption solution, which can be expressed by the formula η² = P. CO2 ×[1-α2×max(Tmin-Tactual,0)-β×max(Tactual-Tmax,0)], calculated as follows, where η2 is the analytical efficiency; P CO2T represents the purity of carbon dioxide after desorption; T is the actual operating temperature of the desorption tower; Tmin and Tmax are the lower and upper limits of the optimal temperature range (e.g., 105℃ and 115℃), respectively; α is the low-temperature penalty coefficient, such as 0.003 / ℃; β is the high-temperature penalty coefficient, such as 0.002 / ℃. Operating efficiency is a comprehensive representation of absorption efficiency and desorption efficiency. For example, operating efficiency can be calculated using a weighted average or comprehensive evaluation index, such as: Operating efficiency = w1 × absorption efficiency + w2 × desorption efficiency, where w1 and w2 are weighting coefficients, which can be set according to process requirements, such as both being 0.5; for example, if the absorption efficiency is 90% and the desorption efficiency is 95%, using weighting coefficients of 0.5 and 0.5, then the operating efficiency = (0.5 × 90%) + (0.5 × 95%) = 92.5%.

[0049] By implementing the above embodiments, the absorption and desorption efficiencies are calculated using indicators such as the temperature difference between the absorption tower and the desorption tower and the change in gas carbon dioxide concentration, thereby accurately assessing the overall working efficiency. This multi-parameter-based efficiency assessment method can provide more accurate data support, enabling the equipment to operate optimally under different working conditions, improving the carbon dioxide capture effect and reducing energy waste.

[0050] In some embodiments, the aforementioned parameter settings may include the analytical heating temperature setting, the absorption module outlet flow rate setting, and the analytical module inlet flow rate setting; the aforementioned step 103 may include: when the aforementioned balance state is unbalanced and the working efficiency is greater than or equal to a preset efficiency, performing a state correction operation, wherein the state correction operation may include at least one of increasing the absorption module outlet flow rate setting, decreasing the analytical module inlet flow rate setting, and increasing the analytical module heating temperature setting.

[0051] In some examples, the preset efficiency is a target operating efficiency threshold set during equipment operation, i.e., the minimum operating efficiency that the coal gas carbon dioxide capture equipment is expected to achieve during normal operation. The preset efficiency can be set by engineers or the equipment management system based on historical data, process requirements, energy consumption optimization strategies, etc. For example, by analyzing past production data, it may be found that when the equipment operating efficiency is ≥85%, the capture effect is better and the energy consumption is reasonable; therefore, 85% is set as the preset efficiency. State correction operation is an operation that, when the coal gas carbon dioxide capture equipment is in an "unbalanced" state but the operating efficiency is ≥ the preset efficiency, allows for minor parameter adjustments to restore the equipment to balance without affecting the overall operating efficiency. The outlet flow rate of the absorption module refers to the gas or liquid flow rate after passing through the absorption tower and heading to subsequent processing units, such as buffer tanks and desorption towers. Increasing the outlet flow rate can improve the system's gas handling capacity and promote efficient carbon dioxide transmission and absorption balance. The inlet flow rate of the desorption module refers to the flow rate of the absorbent solution entering the desorption tower. Reducing the inlet flow rate can reduce the load on the desorption tower, making the desorption process more stable and avoiding a decrease in desorption efficiency or excessive energy consumption. The heating temperature of the desorption tower directly affects the carbon dioxide desorption rate. Increasing the heating temperature can enhance the release of carbon dioxide, improve the desorption efficiency, and thus stabilize the working state of the entire device.

[0052] Through the implementation of the above embodiments, when the equipment is in an unbalanced state but its working efficiency is still high, the flow rate and desorption heating temperature of the absorption module and the desorption module are automatically adjusted to restore the equipment to a balanced state. This can prevent process deviations caused by long-term operation, ensure that the equipment always operates in a high-efficiency state, improve carbon dioxide capture efficiency, and reduce energy waste caused by fluctuations.

[0053] In some embodiments, the aforementioned parameter settings may include setting the speed of the absorption solution circulation pump, setting the pressure value of the desorption tower, and setting the pH value of the solution; the aforementioned step 103 may include: when the aforementioned equilibrium state is balanced and the working efficiency is less than the preset efficiency, performing an efficiency correction operation, wherein the efficiency correction operation may include increasing the speed setting of the absorption solution circulation pump, increasing the pressure value setting of the desorption tower, and adjusting the pH value setting of the solution.

[0054] In some examples, efficiency correction refers to the operation of optimizing key parameters to improve the overall efficiency of an equipment when its equilibrium state is normal (i.e., stable operation) but its operating efficiency is lower than the preset efficiency. The rotational speed of the absorbent solution circulation pump determines the flow rate of the absorbent solution; increasing the speed accelerates the solution circulation, allowing for more complete carbon dioxide absorption and improving absorption efficiency. The pressure of the stripping column directly affects the carbon dioxide stripping rate; appropriately increasing the stripping column pressure can enhance carbon dioxide release and improve stripping efficiency. The pH value of the absorbent solution affects the solubility and absorption efficiency of carbon dioxide. Adjusting the solution pH value can optimize the absorption process and improve collection efficiency; for example, if the absorbent solution pH value is too low (e.g., drops to 6.0), it may lead to a decrease in carbon dioxide absorption capacity. Adding an appropriate amount of NaOH to adjust the pH value to 7.5 can improve absorption efficiency.

[0055] By implementing the above embodiments, when the equipment is in a balanced state but the overall working efficiency is low, by optimizing parameters such as the speed of the absorption solution circulation pump, the pressure of the desorption tower, and the pH value of the solution, the overall performance of the capture system can be improved, so that the equipment not only remains stable, but also further improves the carbon dioxide capture efficiency, achieves more precise energy consumption management, and improves the economy and sustainability of the equipment.

[0056] In some embodiments, step 103 may include: generating an execution request to adjust the parameter settings of the gas carbon dioxide capture device based on the balance state and working efficiency; and adjusting the parameter settings of the gas carbon dioxide capture device when the execution request is confirmed.

[0057] In some examples, an execution request refers to a request generated based on the equipment's balance status and operating efficiency analysis results, used to adjust the parameter settings of the coal gas carbon dioxide capture equipment. Confirmation of an execution request means that the generated request has been reviewed and approved by the system or operator, and the execution operation begins to take effect, ensuring that equipment adjustments are performed at the appropriate time. For example, when a temperature deviation of >5℃ is detected in the stripping tower and continues for more than 3 minutes, an execution request containing "stripping tower heating power +8%" is automatically generated. If the built-in safety verification module verifies that the limit is not exceeded (current power 75%→83%, lower than the maximum allowable value of 90%), the execution request is considered confirmed, and the adjustment is immediately executed. Or, when the absorption efficiency decreases and pH needs to be adjusted, the operation interface pops up a request: "It is recommended to inject NaOH solution 2L / min, the pH is expected to rise from 7.2 to 7.8, and the efficiency will recover by 3.5%. Please confirm execution: [Approve] / [Reject] / [Modify Parameters]". If the operator does not respond within a preset time or receives a signal that the operator clicks the "[Approve]" button, the execution request is considered confirmed, and the adjustment is immediately executed.

[0058] By implementing the above embodiments, an execution request for adjusting parameters is generated, and the adjustment is only implemented after confirmation. This avoids the impact of misoperation or unnecessary adjustments on the equipment. This mechanism improves the controllability and security of parameter adjustment, makes the adjustment process more stable and reliable, and further enhances the intelligence and adaptability of the method.

[0059] Furthermore, as an implementation of the aforementioned method embodiments, this application also provides an intelligent control device for capturing carbon dioxide from coal gas, used to implement the aforementioned method embodiments. This device embodiment corresponds to the aforementioned method embodiments. For ease of reading, this coal gas carbon dioxide capture device embodiment will not repeat the details of the aforementioned method embodiments one by one, but it should be clear that the device in this application embodiment can correspondingly implement all the contents of the aforementioned method embodiments. For example... Figure 2 As shown, the gas carbon dioxide capture device 20 includes: a detection data acquisition unit 201, an equipment status determination unit 202, and an equipment parameter adjustment unit 203. The detection data acquisition unit 201 is used to acquire detection data from the gas carbon dioxide capture device. This detection data may include the state of the absorption solution, the temperature of the absorption tower, the concentration of carbon dioxide in the gas before absorption, the concentration of carbon dioxide in the gas after absorption, the state of the buffer solution, the state of the desorption solution, the temperature of the desorption tower, and the purity of the carbon dioxide after desorption. The equipment status determination unit 202 is used to determine the balance state and working efficiency of the gas carbon dioxide capture device based on the detection data. The equipment parameter adjustment unit 203 is used to adjust the parameter settings of the gas carbon dioxide capture device based on the balance state and working efficiency.

[0060] In some embodiments, the device state determination unit 202 is further configured to predict the equilibrium state by real-time data trends of the state of the absorption solution, the temperature of the absorption tower, the state of the desorption solution, and the temperature of the desorption tower.

[0061] In some embodiments, the device state determination unit 202 is further configured to determine that the equilibrium state is unbalanced when the detection difference between the carbon dioxide concentration of the absorbed coal gas and the preset target concentration is greater than the preset difference for a first preset time, or the purity of the carbon dioxide after analysis is less than the preset purity for a second preset time.

[0062] In some embodiments, the equipment status determination unit 202 is further configured to determine the absorption efficiency of the gas carbon dioxide capture device based on a first difference between the temperature of the absorption tower and the temperature of the desorption tower, and a second difference between the carbon dioxide concentration of the gas before absorption and the carbon dioxide concentration of the gas after absorption; determine the desorption efficiency of the gas carbon dioxide capture device based on the purity of the carbon dioxide after desorption and the temperature of the desorption tower; and determine the operating efficiency based on the absorption efficiency and the desorption efficiency.

[0063] In some embodiments, the parameter settings include the analytical heating temperature setting, the absorption module outlet flow setting, and the analytical module inlet flow setting; the equipment parameter adjustment unit 203 is also used to perform a state correction operation when the balance state is unbalanced and the working efficiency is greater than or equal to the preset efficiency, wherein the state correction operation includes at least one of increasing the absorption module outlet flow setting, decreasing the analytical module inlet flow setting, and increasing the analytical module heating temperature setting.

[0064] In some embodiments, the parameter settings include the absorption solution circulation pump speed setting, the desorption tower pressure setting, and the solution pH setting; the equipment parameter adjustment unit 203 is also used to perform an efficiency correction operation when the equilibrium state is balanced and the working efficiency is less than the preset efficiency, wherein the efficiency correction operation includes at least one of increasing the absorption solution circulation pump speed setting, increasing the desorption tower pressure setting, and adjusting the solution pH setting.

[0065] In some embodiments, the equipment parameter adjustment unit 203 is further configured to generate an execution request to adjust the parameter settings of the gas carbon dioxide capture device based on the balance state and working efficiency; when the execution request is confirmed, the parameter settings of the gas carbon dioxide capture device are adjusted.

[0066] This application also provides a computer-readable storage medium storing computer-executable instructions or computer programs, which, when executed by a processor, will cause the processor to perform any step of the intelligent control method for capturing carbon dioxide in coal gas provided in this application.

[0067] In some embodiments, the computer-readable storage medium may be a random access memory (RAM), a read-only memory (ROM), flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); or it may be a variety of devices that include one or any combination of the above-mentioned memories.

[0068] In some embodiments, computer-executable instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0069] In some embodiments, computer-executable instructions may, but do not necessarily, correspond to files in a file system, and may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple co-located files (e.g., files that store one or more modules, subroutines, or code sections).

[0070] In some embodiments, computer-executable instructions may be deployed to execute on an electronic device, or on multiple electronic devices located at one location, or on multiple electronic devices distributed across multiple locations and interconnected via a communication network.

[0071] like Figure 3 As shown, this application also provides an electronic device 30, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor. When the processor 320 executes the computer program 311, it implements any step of the above-mentioned intelligent control method for capturing carbon dioxide in coal gas.

[0072] This application also provides a computer program product comprising a computer program or computer-executable instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer program or computer-executable instructions from the computer-readable storage medium and executes the computer program or computer-executable instructions, causing the electronic device to perform any step of the intelligent control method for capturing carbon dioxide in coal gas described above.

[0073] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for intelligent control of carbon dioxide capture in coal gas, characterized in that, include: Acquire detection data from a coal gas carbon dioxide capture device, wherein the detection data includes the state of the absorption solution, the temperature of the absorption tower, the concentration of carbon dioxide in the coal gas before absorption, the concentration of carbon dioxide in the coal gas after absorption, the state of the buffer solution, the state of the desorption solution, the temperature of the desorption tower, and the purity of carbon dioxide after desorption. Based on the detection data, the balance status and working efficiency of the gas carbon dioxide capture equipment are determined; Adjust the parameter settings of the gas carbon dioxide capture equipment according to the balance state and the working efficiency; The process of determining the equilibrium state includes: When the difference between the detected concentration of carbon dioxide in the absorbed gas and the preset target concentration is greater than the preset difference for a first preset time, or when the purity of the carbon dioxide after analysis is less than the preset purity for a second preset time, the equilibrium state is determined to be unbalanced. The process of determining the work efficiency includes: The absorption efficiency of the gas carbon dioxide capture device is determined based on the first difference between the temperature of the absorption tower and the temperature of the desorption tower, and the second difference between the carbon dioxide concentration of the gas before absorption and the carbon dioxide concentration of the gas after absorption. The desorption efficiency of the gas carbon dioxide capture device is determined based on the purity of the desorbed carbon dioxide and the temperature of the desorption tower. The working efficiency is determined based on the absorption efficiency and the analysis efficiency.

2. The intelligent control method for carbon dioxide capture in coal gas according to claim 1, characterized in that, The process of determining the equilibrium state includes: The equilibrium state is predicted by using real-time data trends of the state of the absorption solution, the temperature of the absorption tower, the state of the desorption solution, and the temperature of the desorption tower.

3. The intelligent control method for carbon dioxide capture in coal gas according to claim 1, characterized in that, The parameter settings include the analytical heating temperature setting, the absorption module outlet flow rate setting, and the analytical module inlet flow rate setting. The step of adjusting the parameter settings of the gas carbon dioxide capture equipment according to the balance state and the working efficiency includes: When the balance state is unbalanced and the working efficiency is greater than or equal to the preset efficiency, a state correction operation is performed, wherein the state correction operation includes at least one of increasing the outlet flow rate setting of the absorption module, decreasing the inlet flow rate setting of the analysis module, and increasing the heating temperature setting of the analysis module.

4. The intelligent control method for carbon dioxide capture in coal gas according to claim 3, characterized in that, The parameter settings include the absorption solution circulation pump speed setting, the desorption tower pressure setting, and the solution pH setting; The step of adjusting the parameter settings of the gas carbon dioxide capture equipment according to the balance state and the working efficiency includes: When the equilibrium state is balanced and the working efficiency is less than the preset efficiency, an efficiency correction operation is performed, wherein the efficiency correction operation includes at least one of increasing the speed setting of the absorption solution circulation pump, increasing the pressure setting of the desorption tower, and adjusting the pH setting of the solution.

5. The intelligent control method for carbon dioxide capture in coal gas according to claim 1, characterized in that, The step of adjusting the parameter settings of the gas carbon dioxide capture equipment according to the balance state and the working efficiency includes: Based on the balance state and the working efficiency, an execution request is generated to adjust the parameter settings of the gas carbon dioxide capture equipment. When the execution request is confirmed, the parameter settings of the gas carbon dioxide capture device are adjusted.

6. A smart control device for capturing and regulating carbon dioxide from coal gas, characterized in that, include: The detection data acquisition unit is used to acquire the detection data of the coal gas carbon dioxide capture equipment. The detection data includes the state of the absorption solution, the temperature of the absorption tower, the concentration of coal gas carbon dioxide before absorption, the concentration of coal gas carbon dioxide after absorption, the state of the buffer solution, the state of the desorption solution, the temperature of the desorption tower, and the purity of carbon dioxide after desorption. The equipment status determination unit is used to determine the balance status and working efficiency of the gas carbon dioxide capture equipment based on the detection data. The equipment parameter adjustment unit is used to adjust the parameter settings of the gas carbon dioxide capture equipment according to the balance state and the working efficiency. The equipment status determination unit is further configured to determine that the equilibrium state is unbalanced when the detection difference between the carbon dioxide concentration of the absorbed coal gas and the preset target concentration is greater than the preset difference for a first preset time, or when the purity of the carbon dioxide after analysis is less than the preset purity for a second preset time. The equipment status determination unit is further configured to determine the absorption efficiency of the gas carbon dioxide capture device based on a first difference between the temperature of the absorption tower and the temperature of the desorption tower, and a second difference between the carbon dioxide concentration of the gas before absorption and the carbon dioxide concentration of the gas after absorption; determine the desorption efficiency of the gas carbon dioxide capture device based on the purity of the carbon dioxide after desorption and the temperature of the desorption tower; and determine the operating efficiency based on the absorption efficiency and the desorption efficiency.

7. An electronic device, comprising: The memory and processor are characterized in that the processor is used to execute the computer program stored in the memory to implement the steps of the intelligent control method for capturing carbon dioxide from coal gas as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the intelligent control method for capturing carbon dioxide from coal gas as described in any one of claims 1-5.

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