Product quality control equipment for methanation device

Abstract

The embodiment of the invention discloses product quality control equipment for a methanation device. The equipment comprises a production system, a distributed control system and an advanced control system, a gasification device of the production system is used for conveying raw gas to a conversion furnace, the conversion furnace is used for converting the raw gas, obtained converted gas is conveyed to a purification device, the purification device is used for purifying the converted gas, obtained raw material gas is conveyed to a methanation device, and the methanation device is used for carrying out methanation reaction on the raw material gas to obtain finished product gas; the distributed control system is used for collecting the hydrogen-carbon ratio of the conversion gas output by the conversion furnace, the raw material gas specific gravity of the raw material gas output by the purification device and the hydrogen content of the finished product gas; and the advanced control system is used for determining the threshold value increment of the control valve according to the hydrogen-carbon ratio, the raw material gas specific gravity and the hydrogen content. By applying the scheme provided by the embodiment of the invention, the methanation production process can be accurately controlled, and the quality of the finished gas is ensured to meet the process requirements.

Description

Technical Field

[0001] The present application relates to the technical field of methane production, and in particular to a product quality control device for a methanation device. Background Art

[0002] In the actual production process of the methanation unit, due to the instability of the quality of the gasification raw materials and the degree of reaction, as well as the frequent occurrence of abnormal failures in the process and the lack and lag of online detection of raw coal gas, the operating performance parameters and product parameters of each unit are often in change accordingly.

[0003] In the known methanation production control process, the process control cannot be changed with the change of working conditions, or it is completely controlled manually, which will cause the control results to deviate greatly due to the deviation of the actual working conditions, and thus it is impossible to ensure that the quality of the finished gas meets the process requirements. Therefore, how to accurately control the methanation production process to ensure that the quality of the finished gas meets the process requirements has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present application provides a product quality control device for a methanation device to accurately control the methanation production process, thereby ensuring that the quality of the finished gas meets the process requirements. The specific technical solution is as follows.

[0005] The embodiment of the present application provides a product quality control device for a methanation device, the device comprising: a production system, a distributed control system and an advanced control system; the distributed control system is connected to both the production system and the advanced control system;

[0006] The production system at least comprises: a gasification device, a control valve, a shift furnace, a purification device and a methanation device; the gas outlet of the gasification device is connected to the gas inlet of the shift furnace through a gas pipeline, the gas outlet of the shift furnace is connected to the gas inlet of the purification device through a gas pipeline, the gas outlet of the purification device is connected to the gas inlet of the methanation device through a gas pipeline, the gas inlet of the control valve is connected to the gas inlet of the shift furnace through a gas pipeline, and the gas outlet of the control valve is connected to the gas outlet of the shift furnace through a gas pipeline;

[0007] The gasification device is used to transport the raw coal gas to the shift converter; the shift converter is used to shift the raw coal gas, and the resulting shifted gas is transported to the purification device; the purification device is used to purify the shifted gas, and the resulting raw gas is transported to the methanation device; the methanation device is used to perform a methanation reaction on the raw gas to obtain a finished gas; the control valve is used to control the amount of raw coal gas entering the shift converter;

[0008] The distributed control system is used to collect the hydrogen-carbon ratio of the conversion gas output by the conversion furnace, the raw gas specific gravity of the raw gas output by the purification device, and the hydrogen content of the finished gas; the hydrogen-carbon ratio is the ratio of the hydrogen content to carbon monoxide in the conversion gas, the raw gas specific gravity is the ratio of the raw gas to standard air density, and the hydrogen content is the hydrogen specific gravity in the finished gas;

[0009] The advanced control system is used to obtain the hydrogen-to-carbon ratio, the feed gas specific gravity and the hydrogen content, and determine the valve value increment of the control valve based on the hydrogen-to-carbon ratio, the feed gas specific gravity and the hydrogen content.

[0010] Optionally, the advanced control system includes: a hydrogen content controller, a specific gravity controller and a hydrogen-carbon ratio controller;

[0011] The hydrogen content controller is used to obtain the latest hydrogen content measurement value in the hydrogen content, and determine whether the hydrogen content measurement value is within the preset normal range of hydrogen content; when the hydrogen content measurement value is not within the normal range of hydrogen content, obtain the current raw gas specific gravity value in the raw gas specific gravity, and calculate the raw gas specific gravity target value according to the size relationship between the hydrogen content measurement value and the preset normal range of hydrogen content, the current raw gas specific gravity value, the hydrogen content measurement value and the boundary value of the preset normal range of hydrogen content;

[0012] The specific gravity controller is used to obtain a hydrogen-carbon ratio measurement value before a first time period in the hydrogen-carbon ratio, and calculate a target hydrogen-carbon ratio value according to the hydrogen-carbon ratio measurement value, the current raw gas specific gravity value and the raw gas specific gravity target value;

[0013] The hydrogen-carbon ratio controller is used to obtain a real-time hydrogen-carbon ratio measurement value in the hydrogen-carbon ratio, and input the real-time hydrogen-carbon ratio measurement value and the hydrogen-carbon ratio target value into an advanced control model to obtain a valve value increment of the control valve.

[0014] Optionally, the hydrogen content controller is specifically used for:

[0015] When the hydrogen content measurement value is greater than the upper boundary value of the preset hydrogen content normal range, the target value of the raw gas specific gravity is calculated according to the current raw gas specific gravity value, the hydrogen content measurement value and the upper boundary value of the preset hydrogen content normal range;

[0016] When the hydrogen content measurement value is less than the lower boundary value of the preset hydrogen content normal range, the raw gas specific gravity target value is calculated according to the current raw gas specific gravity value, the hydrogen content measurement value and the lower boundary value of the preset hydrogen content normal range.

[0017] Optionally, the hydrogen content controller is specifically used for:

[0018] Calculate a first difference between the hydrogen content measurement value and the upper boundary value of the preset hydrogen content normal range; calculate a first product of a preset first coefficient and the first difference; calculate the sum of the current raw gas specific gravity value and the first product as the raw gas specific gravity target value; or

[0019] Calculate the second difference between the hydrogen content measurement value and the lower boundary value of the preset hydrogen content normal range; calculate the second product of the preset first coefficient and the second difference; calculate the sum of the current raw gas specific gravity value and the second product as the raw gas specific gravity target value.

[0020] Optionally, the specific gravity controller is specifically used for:

[0021] Calculating a third difference between the current raw gas specific gravity value and the raw gas specific gravity target value;

[0022] Calculating a second product of a preset second coefficient and the third difference;

[0023] The sum of the hydrogen-to-carbon ratio measurement value and the second product is calculated as a hydrogen-to-carbon ratio target value.

[0024] Optionally, the first duration is a working cycle of the purification device.

[0025] Optionally, the advanced control system is further used to send the valve increment value to the distributed control system;

[0026] The distributed control system is also used to receive the valve increment value and control the opening and closing degree of the control valve based on the valve increment value.

[0027] Optionally, the distributed control system and the advanced control system perform data communication based on a real-time data interface OPC protocol.

[0028] In an embodiment of the present application, during the methane production process of the production system, multiple relevant parameters can be collected through a distributed control system. Specifically, the hydrogen-carbon ratio of the conversion gas output by the conversion furnace, the raw gas density of the raw gas output by the purification device, and the hydrogen content of the finished gas can be collected. It can be understood that in the methanation production process, the production conditions of each device will have a certain impact on the final quality of the finished gas, and the above parameters can reflect the quality of the finished gas. Therefore, in an embodiment of the present application, by collecting the above three parameters, the operating conditions of each device in the entire production system can be obtained. Furthermore, based on the advanced control system, the valve value increment of the control valve can be automatically determined according to the hydrogen-carbon ratio, the raw gas density and the hydrogen content. That is to say, the opening and closing degree of the control valve can be adjusted according to the acquired parameters, so that the corresponding parameters after adjustment meet the requirements, that is, the quality of the finished gas meets the process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of the structure of a product quality control device for a methanation device provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of the production system provided in the embodiment of the present application;

[0032] Figure 3 Another structural schematic diagram of a product quality control device for a methanation device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present application and the accompanying drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0035] The embodiment of the present application discloses a product quality control device for a methanation device to accurately control the methanation production process, thereby ensuring that the quality of the finished gas meets the process requirements. The embodiment of the present application is described in detail below.

[0036] Figure 1 A schematic diagram of the structure of a product quality control device for a methanogenization device provided in an embodiment of the present application is shown. Figure 1 As shown, the device includes: a production system, a distributed control system and an advanced control system; the distributed control system is connected to both the production system and the advanced control system. The distributed control system and the advanced control system can be connected by wire or wirelessly, which is possible.

[0037] Among them, Figure 2 As shown, the above-mentioned production system may at least include: a gasification device, a control valve, a conversion furnace, a purification device and a methanation device; the gas outlet of the gasification device is connected to the gas inlet of the conversion furnace through a gas pipeline, the gas outlet of the conversion furnace is connected to the gas inlet of the purification device through a gas pipeline, the gas outlet of the purification device is connected to the gas inlet of the methanation device through a gas pipeline, the gas inlet of the control valve is connected to the gas inlet of the conversion furnace through a gas pipeline, and the gas outlet of the control valve is connected to the gas outlet of the conversion furnace through a gas pipeline.

[0038] The gasification device is used to transport the raw coal gas to the conversion furnace; the conversion furnace is used to convert the raw coal gas, and the obtained converted gas is transported to the purification device; the purification device is used to purify the converted gas, and the obtained raw gas is transported to the methanation device; the methanation device is used to perform methanation reaction on the raw gas to obtain finished gas; the control valve is used to control the gas volume of the raw coal gas entering the conversion furnace.

[0039] The distributed control system (DCS) is used to collect the hydrogen-to-carbon ratio of the conversion gas output by the conversion furnace, the raw gas density of the raw gas output by the purification device, and the hydrogen content of the finished gas; the hydrogen-to-carbon ratio is the ratio of the hydrogen content to carbon monoxide in the conversion gas, the raw gas density is the ratio of the raw gas to the standard air density, and the hydrogen content is the hydrogen density in the finished gas.

[0040] The advanced control system (APC, Advanced Process Control) is used to obtain the hydrogen-carbon ratio, the specific gravity of the feed gas and the hydrogen content, and determine the valve value increment of the control valve based on the hydrogen-carbon ratio, the specific gravity of the feed gas and the hydrogen content.

[0041] It can be understood that in the production system, there is a mutual dependence between the various devices (conversion furnace, purification device, methanation device), and the output of the previous device will directly affect the output gas quality of the subsequent device. Therefore, in the embodiment of the present application, based on the advanced control system, the valve value increment of the control valve can be determined according to the hydrogen-carbon ratio, the specific gravity of the raw gas and the hydrogen content, that is, the amount of raw gas entering the conversion furnace can be controlled, and then the output gas situation of each subsequent device can be controlled.

[0042] For example, since there is a dependency relationship between the devices, the output of the previous device can be adjusted based on the output of the latter device according to the order of the devices. In the methanation production system, the hydrogen content in the finished gas needs to be controlled within a certain range. Therefore, the target value of the specific gravity can be determined first according to the hydrogen content, and then the target value of the hydrogen-carbon ratio can be determined according to the target value of the specific gravity, and finally the valve value increment of the control valve can be determined according to the target value of the hydrogen-carbon ratio. In other words, the hydrogen content of the finished gas, the specific gravity of the raw gas, and the hydrogen-carbon ratio can be transferred and controlled step by step between the three unit devices, and at the same time, problems such as large interference, large lag, discontinuous and unmeasurable variable measurement can be overcome, key variables can be stably controlled, valves can be adaptively adjusted, and zero manual intervention can be achieved under normal production conditions.

[0043] Figure 2 The control scheme of the system shown is as follows:

[0044] The raw coal gas from the gasification device enters the conversion section. Due to the uncertain quality of the raw coal used for the gasification reaction, the use of multiple gasifiers at the same time, the different operating methods of personnel, and the addition and subtraction of loads at any time, the content of each component of the raw coal gas produced by gasification is constantly changing. Because the temperature of the gasified raw coal gas is high, it is easy to precipitate oily or powdery impurities, resulting in the current lack of reliable instruments to detect gas components in real time, which brings considerable difficulties to the conversion furnace to control the ratio of hydrogen and carbon monoxide, the hydrogen-carbon ratio. When the conversion gas after the conversion reaction is sent to the methanation device after removing impurities such as carbon dioxide and water through the purification device, the methanation inlet valve needs to control the pressure of the preceding section, which leads to large fluctuations in the methanation reaction load, and it is difficult to accurately control the reaction to be complete. In this case, strictly controlling the hydrogen content in the finished gas produced by the methanation reaction to be between 2% and 3% cannot be completed by the methanation reaction alone. Therefore, the control focus of the embodiment of the present application is to control the hydrogen-carbon ratio.

[0045] According to production data, the content of each component of the gasified raw coal gas cannot be measured. It is necessary to wait until the conversion reaction is completed and then divide the results measured by the carbon monoxide real-time measuring instrument and the hydrogen real-time measuring instrument to obtain the hydrogen-carbon ratio to feedback and adjust the only control valve of the conversion reaction-the conversion furnace bypass valve. By adjusting the conversion furnace bypass valve, the amount of gas passing through the conversion furnace conversion reaction and the amount of gas bypassing the conversion reaction can be controlled. When the hydrogen-carbon ratio has an upward trend, the bypass valve is opened in time to reduce the amount of raw coal gas going to the conversion furnace to participate in the conversion reaction, so that the carbon monoxide consumed by the conversion reaction becomes less, the hydrogen generated becomes less, and the hydrogen-carbon ratio is maintained stable, and vice versa. The reaction time is about 5 minutes. Because the hydrogen content measurement instrument in the methanation export finished product is a chromatograph that takes samples every 5 minutes, the analysis results are obtained after 5 minutes, and the hydrogen obtained by the analysis result is a step-shaped curve, and the trend of hydrogen content is unpredictable due to the real-time changes in the methanation reaction, and the measurement results cannot reflect the specific trend of hydrogen changes. This, together with the lag of about 30 to 40 minutes from the conversion inlet to the methanation outlet, constitutes the biggest difficulty of the control system.

[0046] After analysis, it is found that there is a purified gas specific gravity measuring instrument at the methanation inlet, which is measured and displayed in real time. The specific gravity is the ratio of the purified gas to the standard air density. The real-time trend curve of the specific gravity is strongly correlated with the step trend curve of the hydrogen content at the outlet of the methanation reaction. The directions are roughly the same, but the specific gravity is greatly affected by the methane content in the purified gas. In the control scheme, the historical data of the methane content and the specific gravity meter are used to make an advanced control model of the influence of the methane content on the specific gravity. As the interference of methane on the specific gravity, when the methane content becomes low, the specific gravity is reduced according to the control advanced control model, and vice versa. Similarly, using historical data and step test data, a control model is made for the hydrogen content in the methanation product gas based on the specific gravity. When the hydrogen content changes, the appropriate specific gravity value is obtained. Then, after comparing the data, a range is taken with the appropriate specific gravity value as the center, so that the specific gravity fluctuates within the range, and the hydrogen content can be guaranteed to be an appropriate value. Therefore, the hydrogen control target is fixed at 2% to 3%, but the control range of the specific gravity is adjusted in real time according to the methanation reaction situation. After eliminating the interference of methane content in the purified gas, when the specific gravity is too low, it means that the hydrogen content in the purified gas becomes higher, which will cause the hydrogen content at the outlet of the methanation reaction to exceed the upper limit. When the specific gravity is too high, it means that the hydrogen content in the purified gas becomes lower and the carbon monoxide content is high, which will cause the hydrogen content at the outlet of the methanation reaction to exceed the lower limit. Both require timely adjustment of the hydrogen-carbon ratio.

[0047] Based on historical data and step tests, an advanced control model for the hydrogen-carbon ratio of the purified gas at the methanation inlet is made, and the gas volume entering the shift converter is used as a constraint to control the ratio to be stable within the floating control target range, so that the hydrogen content at the methanation outlet is qualified. This results in the actual control of the hydrogen-carbon ratio also being a floating range. Using the step test results, an advanced control model for the shift bypass valve and the hydrogen-carbon ratio is made, and the bypass valve is used to filter the fluctuations caused by the preceding gasification device, and the hydrogen-carbon ratio is stably controlled within the floating target range, indirectly controlling the hydrogen content to be qualified.

[0048] In one implementation, Figure 3 As shown, the advanced control system may include: a hydrogen content controller, a specific gravity controller and a hydrogen-carbon ratio controller. In addition, the distributed control system and the advanced control system may communicate data based on the real-time data interface OPC protocol.

[0049] The distributed control system collects production data from the device and sends it to the advanced control system through OPC. After receiving the production data, the advanced control system performs calculations according to the preset controller and transmits the results back to the DCS through OPC. The DCS system then transmits the command to the on-site device for execution. The construction of the advanced control system requires the construction of a host computer on the upper layer of the DCS system. The advanced control system server connects to the OPC server by accessing the relevant IP in the three-layer switching network. The DCS exchanges data with the advanced control system through the OPC protocol to ensure data security and network security.

[0050] The hydrogen content controller is used to obtain the latest hydrogen content measurement value in the hydrogen content and determine whether the hydrogen content measurement value is within the preset normal range of hydrogen content; when the hydrogen content measurement value is not within the normal range of hydrogen content, obtain the current raw gas specific gravity value in the raw gas specific gravity, and calculate the raw gas specific gravity target value based on the relationship between the hydrogen content measurement value and the preset normal range of hydrogen content, the current raw gas specific gravity value, the hydrogen content measurement value and the boundary value of the preset normal range of hydrogen content.

[0051] The specific gravity controller is used to obtain the hydrogen-carbon ratio measurement value before the first time length in the hydrogen-carbon ratio, and calculate the hydrogen-carbon ratio target value according to the hydrogen-carbon ratio measurement value, the current raw gas specific gravity value and the raw gas specific gravity target value. The above-mentioned first time length is the working cycle of the purification device. If determined according to actual conditions, the first time length can be 20 minutes, 22 minutes, etc.

[0052] The hydrogen-carbon ratio controller is used for obtaining a real-time hydrogen-carbon ratio measurement value in the hydrogen-carbon ratio, and inputting the real-time hydrogen-carbon ratio measurement value and the hydrogen-carbon ratio target value into an advanced control model to obtain a valve value increment of a control valve.

[0053] Among them, the hydrogen content controller is specifically used to: when the hydrogen content measurement value is greater than the upper boundary value of the preset hydrogen content normal range, calculate the raw gas specific gravity target value according to the current raw gas specific gravity value, the hydrogen content measurement value and the upper boundary value of the preset hydrogen content normal range; when the hydrogen content measurement value is less than the lower boundary value of the preset hydrogen content normal range, calculate the raw gas specific gravity target value according to the current raw gas specific gravity value, the hydrogen content measurement value and the lower boundary value of the preset hydrogen content normal range.

[0054] When the measured value of the hydrogen content is greater than the upper boundary value of the preset normal range of the hydrogen content, the hydrogen content controller is specifically used to: calculate the first difference between the measured value of the hydrogen content and the upper boundary value of the preset normal range of the hydrogen content; calculate the first product of the preset first coefficient and the first difference; calculate the sum of the current raw gas specific gravity value and the first product as the raw gas specific gravity target value.

[0055] When the measured value of the hydrogen content is less than the lower boundary value of the preset normal range of the hydrogen content, the hydrogen content controller is specifically used to: calculate the second difference between the measured value of the hydrogen content and the lower boundary value of the preset normal range of the hydrogen content; calculate the second product of the preset first coefficient and the second difference; calculate the sum of the current raw gas specific gravity value and the second product as the raw gas specific gravity target value.

[0056] The specific gravity controller is specifically used to: calculate the third difference between the current raw gas specific gravity value and the raw gas specific gravity target value; calculate the second product of the preset second coefficient and the third difference; calculate the sum of the hydrogen-carbon ratio measurement value and the second product as the hydrogen-carbon ratio target value.

[0057] The above-mentioned first system and second system can be set according to actual conditions, and this application does not limit their specific values.

[0058] The advanced control system can send the valve increment value to the distributed control system after calculating the valve increment value; the distributed control system can receive the valve increment value and control the opening and closing degree of the valve based on the valve increment value.

[0059] In an embodiment of the present application, during the methane production process of the production system, multiple relevant parameters can be collected through a distributed control system. Specifically, the hydrogen-carbon ratio of the conversion gas output by the conversion furnace, the raw gas density of the raw gas output by the purification device, and the hydrogen content of the finished gas can be collected. It can be understood that in the methanation production process, the production conditions of each device will have a certain impact on the final quality of the finished gas, and the above parameters can reflect the quality of the finished gas. Therefore, in an embodiment of the present application, by collecting the above three parameters, the operating conditions of each device in the entire production system can be obtained. Furthermore, based on the advanced control system, the valve value increment of the control valve can be automatically determined according to the hydrogen-carbon ratio, the raw gas density and the hydrogen content. That is to say, the opening and closing degree of the control valve can be adjusted according to the acquired parameters, so that the corresponding parameters after adjustment meet the requirements, that is, the quality of the finished gas meets the process requirements.

[0060] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of one embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present application.

[0061] Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description of the embodiment, or can be changed accordingly and located in one or more devices different from the embodiment. The modules in the above embodiment can be combined into one module, or can be further divided into multiple sub-modules.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A product quality control device for a methanation device, characterized in that: The equipment includes: a production system, a distributed control system and an advanced control system; the distributed control system is connected to both the production system and the advanced control system; The production system at least comprises: a gasification device, a control valve, a shift furnace, a purification device and a methanation device; the gas outlet of the gasification device is connected to the gas inlet of the shift furnace through a gas pipeline, the gas outlet of the shift furnace is connected to the gas inlet of the purification device through a gas pipeline, the gas outlet of the purification device is connected to the gas inlet of the methanation device through a gas pipeline, the gas inlet of the control valve is connected to the gas inlet of the shift furnace through a gas pipeline, and the gas outlet of the control valve is connected to the gas outlet of the shift furnace through a gas pipeline; The gasification device is used to transport the raw coal gas to the shift converter; the shift converter is used to shift the raw coal gas, and the resulting shifted gas is transported to the purification device; the purification device is used to purify the shifted gas, and the resulting raw gas is transported to the methanation device; the methanation device is used to perform a methanation reaction on the raw gas to obtain a finished gas; the control valve is used to control the amount of raw coal gas entering the shift converter; The distributed control system is used to collect the hydrogen-carbon ratio of the conversion gas output by the conversion furnace, the raw gas specific gravity of the raw gas output by the purification device, and the hydrogen content of the finished gas; the hydrogen-carbon ratio is the ratio of the hydrogen content to carbon monoxide in the conversion gas, the raw gas specific gravity is the ratio of the raw gas to standard air density, and the hydrogen content is the hydrogen specific gravity in the finished gas; The advanced control system is used to obtain the hydrogen-to-carbon ratio, the feed gas specific gravity and the hydrogen content, and determine the valve value increment of the control valve based on the hydrogen-to-carbon ratio, the feed gas specific gravity and the hydrogen content.

2. The device according to claim 1, characterized in that The advanced control system includes: a hydrogen content controller, a specific gravity controller and a hydrogen-carbon ratio controller; The hydrogen content controller is used to obtain the latest hydrogen content measurement value in the hydrogen content, and determine whether the hydrogen content measurement value is within the preset normal range of hydrogen content; when the hydrogen content measurement value is not within the normal range of hydrogen content, obtain the current raw gas specific gravity value in the raw gas specific gravity, and calculate the raw gas specific gravity target value according to the size relationship between the hydrogen content measurement value and the preset normal range of hydrogen content, the current raw gas specific gravity value, the hydrogen content measurement value and the boundary value of the preset normal range of hydrogen content; The specific gravity controller is used to obtain a hydrogen-carbon ratio measurement value before a first time period in the hydrogen-carbon ratio, and calculate a target hydrogen-carbon ratio value according to the hydrogen-carbon ratio measurement value, the current raw gas specific gravity value and the raw gas specific gravity target value; The hydrogen-carbon ratio controller is used to obtain a real-time hydrogen-carbon ratio measurement value in the hydrogen-carbon ratio, and input the real-time hydrogen-carbon ratio measurement value and the hydrogen-carbon ratio target value into an advanced control model to obtain a valve value increment of the control valve.

3. The device according to claim 2, characterized in that The hydrogen content controller is specifically used for: When the hydrogen content measurement value is greater than the upper boundary value of the preset hydrogen content normal range, the target value of the raw gas specific gravity is calculated according to the current raw gas specific gravity value, the hydrogen content measurement value and the upper boundary value of the preset hydrogen content normal range; When the hydrogen content measurement value is less than the lower boundary value of the preset hydrogen content normal range, the raw gas specific gravity target value is calculated according to the current raw gas specific gravity value, the hydrogen content measurement value and the lower boundary value of the preset hydrogen content normal range.

4. The device according to claim 3, characterized in that The hydrogen content controller is specifically used for: Calculating a first difference between the hydrogen content measurement value and the upper boundary value of the preset hydrogen content normal range; calculating a first product of a preset first coefficient and the first difference; Calculating the sum of the current raw gas specific gravity value and the first product as the raw gas specific gravity target value; or Calculating a second difference between the hydrogen content measurement value and a lower boundary value of the preset hydrogen content normal range; Calculating a second product of the preset first coefficient and the second difference; The sum of the current raw gas specific gravity value and the second product is calculated as the raw gas specific gravity target value.

5. The device according to claim 2, characterized in that The specific gravity controller is specifically used for: Calculating a third difference between the current raw gas specific gravity value and the raw gas specific gravity target value; Calculating a second product of a preset second coefficient and the third difference; The sum of the hydrogen-to-carbon ratio measurement value and the second product is calculated as a hydrogen-to-carbon ratio target value.

6. The device according to claim 2, characterized in that The first duration is the working cycle of the purification device.

7. The device according to any one of claims 1 to 6, characterized in that: The advanced control system is further used to send the valve increment value to the distributed control system; The distributed control system is also used to receive the valve increment value and control the opening and closing degree of the control valve based on the valve increment value.

8. The device according to any one of claims 1 to 6, characterized in that: The distributed control system and the advanced control system perform data communication based on the real-time data interface OPC protocol.

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