Method and device for online optimization of hydrogen system by coupling process simulation and hydrogen pinch point

Abstract

The present invention discloses a method and device for online optimization of a hydrogen system that couples process simulation and hydrogen pinch points. The method may include: online monitoring and data analysis of operating parameters of hydrogen production and consumption devices of the hydrogen system to obtain key parameter values ​​of the online optimization model of the hydrogen system, and adjusting the mathematical model of the hydrogen production and consumption devices of the hydrogen system based on the key parameter values ​​and actual production values; constructing an objective function based on the online optimization model of the hydrogen system, and optimizing the hydrogen system with the optimized solution constraint values ​​set by the mathematical model of the hydrogen production and consumption devices of the hydrogen system. The method couples hydrogen pinch optimization technology and process simulation technology, and the online optimization method of the hydrogen system that integrates the hydrogen network unit topology model, the hydrogen production and consumption device model, and the separation process model can realize the online quantitative calculation of the hydrogen saving potential during the actual operation of the enterprise's hydrogen network, as well as the online optimization calculation of the key operating parameters of the hydrogen production and consumption devices that meet the production constraints.

Description

Technical Field

[0001] The invention relates to the technical field of oil refining and chemical engineering, and in particular to an online optimization method and device for a hydrogen system with coupled process simulation and hydrogen pinch point. Background Art

[0002] As an important public engineering resource for current refining and chemical companies, hydrogen is becoming increasingly important in production. On the one hand, as the quality of crude oil processed by refining and chemical companies becomes increasingly deteriorating, the API value gradually decreases, and the refining industry's increasingly stringent product environmental requirements, especially the further increase in sulfur content requirements for automobile emission standards, the demand for hydrogen has increased; on the other hand, the cost of hydrogen has increased year by year, and the company's need to reduce costs and increase efficiency has become increasingly urgent for optimization requirements such as reducing new hydrogen consumption and reducing hydrogen emissions. However, since the company's hydrogen network is very complex and needs to be adjusted in a timely and reasonable manner with changes in raw materials, production plans, etc., the technical difficulty of predicting and optimizing the hydrogen system of refining and chemical companies is relatively high.

[0003] Existing technical methods have the following shortcomings: most of the reactors of single devices or hydrogen network models in hydrogen optimization systems adopt offline optimization, and cannot provide timely feedback on the properties of raw materials and changes in production plans in different operating production cycles; and most of the models are static models, assuming that the circulating hydrogen concentration is fixed and not considering the feed amount of the hydrogen-using device, resulting in a large deviation in the later calculation of the system operation compared with the actual production. At the same time, the hydrogen-using device in the system does not consider the gas-liquid phase equilibrium at the separator outlet, and assumes the circulating hydrogen concentration to be a fixed value, etc., resulting in insufficient optimization space, and ultimately limiting the optimization results to theory, and unable to provide scientific and effective hydrogen system operation and scheduling optimization suggestions. Summary of the invention

[0004] In order to achieve joint optimization of the hydrogen system of the refinery and petrochemical enterprise, thereby enriching the technical routes and increasing the selection space, an embodiment of the present invention provides a method and device for online optimization of the hydrogen system by coupling process simulation and hydrogen pinch point.

[0005] In a first aspect, an embodiment of the present invention provides a method for online optimization of a hydrogen system with coupled process simulation and hydrogen pinch point, which may include:

[0006] Pre-build the mathematical model of hydrogen production and consumption devices, hydrogen network node model and cost accounting model of the hydrogen system;

[0007] Based on the hydrogen source and hydrogen sink flow rates and hydrogen purity of the hydrogen system, a hydrogen network pinch point analysis and calculation model is constructed;

[0008] Performing online monitoring and data analysis on the operating parameters of the hydrogen production and consumption device of the hydrogen system to obtain key parameter values ​​of the online optimization model of the hydrogen system, and adjusting the mathematical model of the hydrogen production and consumption device of the hydrogen system based on the key parameter values ​​and actual production values;

[0009] Associating the hydrogen production and consumption device mathematical model, the cost accounting model and the hydrogen network pinch point analysis and calculation model to construct an online optimization model of the hydrogen system;

[0010] An objective function is constructed based on the online optimization model of the hydrogen system, and the hydrogen system is optimized by using the optimization solution constraint values ​​set in the mathematical model of the hydrogen production and consumption device of the hydrogen system.

[0011] Optionally, the method may further include: acquiring real-time data from the oil refining and chemical operation system and the laboratory information management system, and providing the acquired real-time data to the online optimization model of the hydrogen system.

[0012] Optionally, after constructing the hydrogen network pinch point analysis and calculation model, the following steps may also be included:

[0013] By adopting iterative calculation method, the difference between the upper and lower areas of the hydrocarbon source and hydrocarbon sink combination diagram is made zero by reducing the highest concentration hydrocarbon source flow rate, so as to obtain the minimum utility hydrogen consumption and hydrogen pinch concentration.

[0014] Optionally, a mathematical model of hydrogen production and consumption devices of the hydrogen system is pre-built, which may include:

[0015] Based on the parameters required for modeling the hydrogen production and consumption device, simulation is performed using process simulation software to construct a mathematical model of the hydrogen production device and a mathematical model of the hydrogen consumption device of the hydrogen system;

[0016] The parameters required for modeling the hydrogen production device of the hydrogen system include at least one of the following: the composition and flow rate of the raw materials in the reactor of the hydrogen production device, the hydrogen concentration at the reactor outlet, the product gas yield and the utility consumption;

[0017] The parameters required for modeling the hydrogen-using device of the hydrogen system include at least one of the following: raw material properties and flow rate of the hydrogen-using device reactor, product properties and flow rate, circulating hydrogen composition and flow rate, new hydrogen composition and flow rate, circulating hydrogen flow rate, raw material properties, hydrogen-to-oil ratio, separator pressure and temperature.

[0018] Optionally, adjusting the mathematical model of the hydrogen production and consumption device of the hydrogen system may include:

[0019] Based on the comparison result between the key parameter value and the actual production value, a comparison is made with a preset deviation threshold; if the comparison result is greater than the preset deviation threshold, the process simulation software simulates and calculates the component conversion rate of the hydrogen-using device to adjust the mathematical model of the hydrogen-producing and consuming device of the hydrogen system;

[0020] Among them, the key parameter values ​​include: new hydrogen usage, circulating hydrogen usage, and exhaust hydrogen usage.

[0021] Optionally, optimizing the hydrogen system may include:

[0022] According to the preset hydrogen-to-oil ratio and hydrogen partial pressure range of the hydrogenation reactor and the hydrogen production capacity range of the hydrogen production device as constraint conditions, and the hydrogen production cost and hydrogen use cost calculated online, the optimized operating parameters of the hydrogen system are obtained with the total minimum hydrogen production cost and hydrogen use cost as the objective function;

[0023] Among them, the optimized operating parameters include: the hydrogen production capacity of the hydrogen production device, the raw material feed quantity and ratio, the hydrogen-to-oil ratio and hydrogen partial pressure of the hydrogen-using device, the new hydrogen quantity and composition, the circulating hydrogen quantity and composition, the separator hydrogen discharge quantity and composition, the quantity of high-pressure and low-pressure hydrogen pipelines, and the fuel gas quantity delivered by the low-pressure hydrogen pipeline.

[0024] In a second aspect, an embodiment of the present invention provides a hydrogen system online optimization device coupled with process simulation and hydrogen pinch point, which may include:

[0025] A construction module for pre-constructing a mathematical model of hydrogen production and consumption devices, a cost accounting model and a hydrogen network node model of a hydrogen system; and for constructing a hydrogen network pinch point analysis and calculation model based on the hydrogen source and hydrogen sink flow rates and hydrogen purity of the hydrogen system;

[0026] An association module, used to associate the mathematical model of the hydrogen production and consumption device, the cost accounting model and the hydrogen network pinch point analysis and calculation model to construct an online optimization model of the hydrogen system;

[0027] An online monitoring module, used for online monitoring and data analysis of operating parameters of the hydrogen production and consumption device of the hydrogen system, so as to obtain key parameter values ​​of the online optimization model of the hydrogen system, and adjust the mathematical model of the hydrogen production and consumption device of the hydrogen system based on the key parameter values ​​and actual production values;

[0028] The optimization module is used to construct an objective function based on the online optimization model of the hydrogen system, and optimize the hydrogen system according to the optimization solution constraint values ​​set in the mathematical model of the hydrogen production and consumption device of the hydrogen system.

[0029] Optionally, the device may further include: an acquisition module, a hydrogen pinch point online analysis module and a cost accounting module;

[0030] The acquisition module is used to acquire real-time data from the oil refining and chemical operation system and the laboratory information management system, and provide the acquired real-time data to the online optimization model of the hydrogen system;

[0031] The hydrogen pinch point online analysis module is used to adopt an iterative calculation method to reduce the highest concentration hydrocarbon source flow rate so that the difference between the upper and lower areas of the hydrocarbon source and hydrocarbon sink combination diagram is zero, so as to obtain the minimum utility hydrogen consumption and hydrogen pinch point concentration;

[0032] The cost accounting module is used to calculate the hydrogen production cost and hydrogen usage cost online.

[0033] Optionally, the device may further include: a scheduling module and a model management module;

[0034] A scheduling module, used for starting and stopping the hydrogen system in the hydrogen network and processing load operations based on the optimized operating parameters of the hydrogen system obtained by the coupled process simulation and the hydrogen system online optimization device of the hydrogen pinch point;

[0035] The model management module is used to manage and call the pre-established mathematical model of hydrogen production and consumption equipment, the hydrogen network node model and the online optimization model of the hydrogen system.

[0036] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for online optimization of a hydrogen system with coupled process simulation and hydrogen pinch point as described in the first aspect.

[0037] In a fourth aspect, an embodiment of the present invention provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for online optimization of a hydrogen system of coupled process simulation and hydrogen pinch point as described in the first aspect is implemented.

[0038] In a fifth aspect, an embodiment of the present invention provides a hydrogen system online optimization system coupled with process simulation and hydrogen pinch point, which may include: a hydrogen network of a hydrogen system, a system for obtaining oil refining and chemical operation, a laboratory information management system, and a hydrogen system online optimization device coupled with process simulation and hydrogen pinch point as described in the second aspect;

[0039] Among them, the acquisition module of the hydrogen system online optimization device of the coupled process simulation and hydrogen pinch point is used to acquire real-time data of the refining and chemical operation system and the laboratory information management system in real time, and provide the acquired real-time data to the online optimization model of the hydrogen system.

[0040] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0041] An embodiment of the present invention provides a method and device for online optimization of a hydrogen system by coupling process simulation and hydrogen pinch point. The method couples hydrogen pinch point optimization technology and process simulation technology, responds to cost changes in feed, responds to hydrogen consumption in response to changes in operating conditions, and responds to gas-liquid phase equilibrium in response to changes in separation conditions. The method and device for online optimization of a hydrogen system integrate a hydrogen network unit topology model, a hydrogen production and consumption device model, and a separation process model. The method and device can realize online quantitative calculation of the hydrogen saving potential during the actual operation of the enterprise's hydrogen network, and online optimization calculation of key operating parameters of hydrogen production and consumption devices that meet production constraints.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0043] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0045] Figure 1 A flow chart of a method for online optimization of a hydrogen system with coupled process simulation and hydrogen pinch point provided in an embodiment of the present invention;

[0046] Figure 2 It is a schematic diagram of the structure of the hydrogen system online optimization device for coupling process simulation and hydrogen pinch point provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0048] In an embodiment of the present invention, a method for online optimization of a hydrogen system with coupled process simulation and hydrogen pinch point is provided, referring to Figure 1 As shown, the method may include the following steps:

[0049] Step S11, pre-constructing a mathematical model of hydrogen production and consumption devices of the hydrogen system and a hydrogen network node model.

[0050] The hydrogen production and consumption device of the hydrogen system in the embodiment of the present invention at least includes: a hydrogen production device, a hydrogen by-production device, a hydrogen purification device, a hydrogen compressor and a hydrogen use device.

[0051] In the embodiment of the present invention, the above-mentioned mathematical model of the hydrogen production device and the mathematical model of the hydrogen use device are constructed based on the process simulation mechanism. The mathematical model of the hydrogen production device includes linear correlation equations such as the composition of hydrogen production raw materials and the product gas yield, public engineering consumption, etc., which are obtained through regression of the process simulation mechanism model. In the embodiment of the present invention, a more accurate hydrogen production cost optimization and raw material optimization are achieved through the mathematical model of the hydrogen production device based on strict mechanism process simulation.

[0052] The embodiment of the present invention establishes a strict mathematical simulation model of the hydrogen production and consumption device based on the process simulation software. In the specific implementation, based on the parameters required for modeling the hydrogen production and consumption device, the process simulation software is used for simulation to construct the mathematical model of the hydrogen production device and the mathematical model of the hydrogen consumption device of the hydrogen system; wherein, the parameters required for modeling the hydrogen production device of the hydrogen system include: the raw material composition and flow rate of the hydrogen production device reactor, the hydrogen concentration at the reactor outlet, the product gas yield and the public works consumption, etc.; the parameters required for modeling the hydrogen consumption device of the hydrogen system include: the raw material properties and flow rate of the hydrogen consumption device reactor, the product properties and flow rate, the circulating hydrogen composition and flow rate, the new hydrogen composition and flow rate, the circulating hydrogen flow rate, the raw material properties, the hydrogen-oil ratio, the separator pressure and temperature. In this step, a mathematical model of the hydrogen consumption device that couples the simulation model of the hydrogen consumption device reactor and the separator is constructed. The model takes into account the gas-liquid phase separation at the inlet and outlet of the reactor, so that the method can provide more accurate reactor hydrogen consumption and variable circulating hydrogen concentration and flow rate, providing more potential and space for the model to optimize operation.

[0053] The mathematical models of the hydrogen by-product device, hydrogen purification device and hydrogen compressor in the embodiment of the present invention do not need to use process simulation software when constructing, and can be directly constructed through mathematical relationships, which are described in detail as follows:

[0054] The mathematical model of the above hydrogen by-product device is composed of the by-product hydrogen flow rate and composition relationship, which is as follows:

[0055]

[0056] f PG,S,c =x PG,S,c F PG,S

[0057]

[0058] The subscript PG refers to the process device that can produce hydrogen as a by-product, and F PG,S is the total molar flow rate of hydrogen produced as a byproduct of the PG process, f PG,S,cis the molar flow rate of component c in the by-product hydrogen of the PG unit process, x PG,S,c Molar composition of component c in the by-product hydrogen of the PG unit process.

[0059] The by-product hydrogen and various tail gases, purge gases, etc. in the refinery contain different amounts of hydrogen. Purifying these gases with a purification device can significantly reduce the cost of hydrogen and improve the utilization efficiency of hydrogen resources. The mathematical model of the above-mentioned hydrogen purification device is the mathematical relationship between the purity of the feed hydrogen and the recovery rate of the purification device, which is obtained by regressing its operating parameters. The mathematical model of the above-mentioned hydrogen compressor includes the power consumption calculation relationship of the reciprocating compressor and the centrifugal compressor, wherein the power consumption of the reciprocating compressor is calculated based on the isentropic efficiency, and the power consumption of the centrifugal compressor is calculated based on the polytropic efficiency. The mathematical model of the above-mentioned hydrogen device includes the mathematical relationship of the reaction unit and the separation unit, wherein the reaction unit model is the equilibrium relationship between the gas-liquid phase feed and the product of the reactor, and the conversion rate of each component is calculated by its detailed process simulation model; the separation unit model is the gas-liquid phase equilibrium relationship between the high-pressure separator and the low-pressure separator, and the gas-liquid phase separation coefficient is calculated by the Grayson Streed method.

[0060] Among them, the mathematical relationship of the separation unit is as follows:

[0061]

[0062] F Flash,In =F Flash,Vap +F Flash,Liq

[0063] z flash,In,C *F Flash,In =y flash,Vap,C *F Flash,Vap +x flash,Liq,C *F Flash,Liq

[0064] In the formula, F Flash,In 、F Flash,Vap and F Flash,Liq Refers to the molar flow rate of separator feed, gas phase product and liquid phase product respectively; flash,In,C ,y flash,Vap,C and x flash,Liq,C Refers to the molar composition of component C in the separator feed, gas product and liquid product respectively.

[0065] In this step, it is also necessary to establish a hydrogen network node model, which includes a mixed node model and a branch node model. Among them, a node is a point in the hydrogen network that involves hydrogen separation or mixing on the pipeline network. After the hydrogen production device comes out, there is a pipeline for transportation. When it is transported to the place where hydrogen is needed, one will be separated, which is a node. The model of the branch node in this embodiment is as follows:

[0066]

[0067]

[0068]

[0069] in, refers to the molar flow rate of component c of stream S entering the branch node, and They refer to the streams S that go out from the branch nodes. out1 and S out2 The molar flow rate of component c. Refers to the flow stock S out1 The branching ratio.

[0070] Step S12: construct a hydrogen network pinch point analysis and calculation model based on the hydrogen source and hydrogen sink flow rates, hydrogen purity, and hydrogen network node model of the hydrogen system.

[0071] After constructing the hydrogen network pinch analysis calculation model, it can also include: using an iterative calculation method to reduce the highest concentration hydrocarbon source flow so that the difference between the upper and lower areas of the hydrocarbon source and hydrocarbon sink combination diagram is zero, so as to obtain the minimum utility hydrogen consumption and hydrogen pinch concentration.

[0072] Step S13: Associating the mathematical model of the hydrogen production and consumption device, the cost accounting model and the hydrogen network pinch point analysis and calculation model to construct an online optimization model of the hydrogen system.

[0073] In this step, the mathematical model of the hydrogen production and consumption devices of the hydrogen system based on the process simulation mechanism model, the cost accounting model, the hydrogen network pinch analysis calculation model and the interface of the external data can automatically introduce the input parameters required for the model calculation through the user interface of the BS structure, such as: the raw material quantity and composition of the hydrogen production device, the hydrogen production quantity and composition of the hydrogen by-product device, the feed quantity and composition of the hydrogen purification device, the new hydrogen quantity and composition of the hydrogen use device, the circulating hydrogen quantity and composition, the separator temperature and pressure, and the relaxation gas quantity and composition, etc.

[0074] Step S14: Online monitoring and data analysis are performed on the operating parameters of the hydrogen production and consumption device of the hydrogen system to obtain key parameter values ​​of the online optimization model of the hydrogen system, and the mathematical model of the hydrogen production and consumption device of the hydrogen system is adjusted based on the key parameter values ​​and actual production values.

[0075] This step uses the online monitoring module to realize parameter monitoring and updating of the hydrogen system data model to ensure accurate simulation of the hydrogen system in the actual production process. This step specifically adjusts the mathematical model of the hydrogen production and consumption device of the hydrogen system, which can include: comparing the comparison result of the key parameter value and the actual production value with the preset deviation threshold; if the comparison result is greater than the preset deviation threshold, the process simulation software simulates the component conversion rate of the hydrogen device to adjust the mathematical model of the hydrogen production and consumption device of the hydrogen system; wherein the key parameter values ​​include: new hydrogen consumption, circulating hydrogen consumption, and exhaust hydrogen consumption.

[0076] Step S15: construct an objective function based on the online optimization model of the hydrogen system, and optimize the hydrogen system by solving the optimization constraint values ​​set in the mathematical model of the hydrogen production and consumption device of the hydrogen system.

[0077] The objective function in this step is:

[0078] Total operating cost = cost of hydrogen production raw materials + cost of hydrogen production fuel - value of hydrogen production byproduct steam + total operating cost - value of fuel delivered by hydrogen network fuel gas pipeline network

[0079] In this step, based on the preset hydrogenation reactor hydrogen-to-oil ratio and hydrogen partial pressure range, the hydrogen production capacity range of the hydrogen production unit as constraints, and the hydrogen production cost and hydrogen use cost calculated online, the total minimum hydrogen production cost and hydrogen use cost are taken as the objective function to obtain the optimized operating parameters of the hydrogen system; wherein the optimized operating parameters may include: the hydrogen production of the hydrogen production unit, the feed amount and ratio of raw materials, the hydrogen-to-oil ratio and hydrogen partial pressure of the hydrogen use unit, the amount and composition of new hydrogen, the amount and composition of circulating hydrogen, the amount and composition of hydrogen discharged from the separator, the amount and composition of inlet and outlet streams of the hydrogen production (PSA) unit, the amount of high-pressure series low-pressure hydrogen pipelines, and the amount of fuel gas delivered by the low-pressure hydrogen pipeline.

[0080] In an alternative embodiment, referring to Figure 1 As shown, the method may further include step S10, namely:

[0081] Step S10: Real-time data of the oil refining and chemical operation system and the laboratory information management system are obtained, and the obtained real-time data is provided to the online optimization model of the hydrogen system. This step is used to automatically collect real-time data of the MES system (oil refining and chemical operation system), LIMS system (laboratory information management system) and other systems, and automatically access the user interface of the web browser and store it in the real-time database module.

[0082] The above method provided in the embodiment of the present invention couples the hydrogen pinch point optimization technology and the process simulation technology, responds to the cost of feed changes, responds to the hydrogen consumption of operating conditions, and responds to the gas-liquid phase equilibrium of separation conditions. It integrates the hydrogen network unit topology model, hydrogen production and consumption device model and separation process model of the hydrogen system online optimization method and equipment, which can realize the online quantitative calculation of the hydrogen saving potential in the actual operation of the enterprise's hydrogen network, and the online optimization calculation of the key operating parameters of the hydrogen production and consumption device under the production constraints.

[0083] The following is a specific example of applying this method to optimize the operating parameters of the hydrogen system, as shown in Table 1:

[0084] Table 1 Specific examples of optimization of hydrogen system operating parameters

[0085]

[0086] As shown in Table 1, from the above simulation results and optimization results, it can be seen that this method has built a mathematical model of a hydrogen production device based on strict mechanism process simulation to achieve more accurate hydrogen production cost optimization and raw material optimization; at the same time, a mathematical model of a hydrogen device that couples the simulation model of the hydrogen device reactor and separator has been built. The model takes into account the gas-liquid phase separation at the reactor inlet and outlet, so that this method can provide more accurate reactor hydrogen consumption, dissolved hydrogen, and variable circulating hydrogen concentration and flow rate, providing more potential and space for the model to optimize operation. Furthermore, this method uses an online monitoring module to realize parameter monitoring and updating of the hydrogen system data model to ensure accurate simulation of the hydrogen system in the actual production process.

[0087] Based on the same inventive concept, an embodiment of the present invention further provides a hydrogen system online optimization device for coupling process simulation and hydrogen pinch point, referring to Figure 2 As shown, the device may include:

[0088] The construction module 21 is used to pre-construct a mathematical model of a hydrogen production and consumption device and a hydrogen network node model of a hydrogen system; and to construct a cost accounting model of a hydrogen production and consumption device; and to construct a hydrogen network pinch point analysis and calculation model based on the hydrogen source and hydrogen sink flow and hydrogen purity of the hydrogen system;

[0089] The association module 22 is used to associate the mathematical model of the hydrogen production and consumption device, the cost accounting model and the hydrogen network pinch point analysis and calculation model to construct an online optimization model of the hydrogen system;

[0090] The online monitoring module 23 is used to perform online monitoring and data analysis on the operating parameters of the hydrogen production and consumption device of the hydrogen system to obtain the key parameter values ​​of the online optimization model of the hydrogen system, and adjust the mathematical model of the hydrogen production and consumption device of the hydrogen system based on the key parameter values ​​and the actual production values;

[0091] The optimization module 24 is used to construct an objective function based on the online optimization model of the hydrogen system, and optimize the hydrogen system by solving the optimization constraint values ​​set in the mathematical model of the hydrogen production and consumption device of the hydrogen system.

[0092] In an alternative embodiment, referring to Figure 2 As shown, the device may further include: an acquisition module 25, a hydrogen pinch point online analysis module 26 and a cost accounting module 27;

[0093] The acquisition module 25 is used to acquire real-time data from the oil refining and chemical operation system and the laboratory information management system, and provide the acquired real-time data to the online optimization model of the hydrogen system;

[0094] The hydrogen pinch point online analysis module 26 is used to adopt an iterative calculation method to reduce the maximum concentration hydrocarbon source flow rate so that the difference between the upper and lower areas of the hydrocarbon source and hydrocarbon sink combination diagram is zero, so as to obtain the minimum utility hydrogen consumption and hydrogen pinch point concentration;

[0095] The cost accounting module 27 is used to calculate the hydrogen production cost and hydrogen usage cost online.

[0096] In an alternative embodiment, referring to Figure 2 As shown, the device may further include: a scheduling module 28 and a model management module 29;

[0097] The scheduling module 28 is used to start and stop the hydrogen system in the hydrogen network and process load operations based on the optimized operating parameters of the hydrogen system obtained by the coupled process simulation and the hydrogen system online optimization device of the hydrogen pinch point;

[0098] The model management module 29 is used to manage and call the pre-established mathematical model of hydrogen production and consumption equipment, hydrogen network node model and online optimization model of the hydrogen system.

[0099] In an optional embodiment, the construction module 21 is specifically used to: simulate with process simulation software based on the parameters required for modeling the hydrogen production and consumption device to construct a mathematical model of the hydrogen production device and a mathematical model of the hydrogen consumption device of the hydrogen system;

[0100] The parameters required for modeling the hydrogen production device of the hydrogen system include at least one of the following: the composition and flow rate of the raw materials in the reactor of the hydrogen production device, the hydrogen concentration at the reactor outlet, the product gas yield and the utility consumption;

[0101] The parameters required for modeling the hydrogen-using device of the hydrogen system include at least one of the following: raw material properties and flow rate of the hydrogen-using device reactor, product properties and flow rate, circulating hydrogen composition and flow rate, new hydrogen composition and flow rate, circulating hydrogen flow rate, raw material properties, hydrogen-to-oil ratio, separator pressure and temperature.

[0102] In another optional embodiment, the model management module 29 is also used to: compare the comparison result between the key parameter value and the actual production value with a preset deviation threshold; if the comparison result is greater than the preset deviation threshold, the process simulation software simulates the component conversion rate of the hydrogen-using device to adjust the mathematical model of the hydrogen production and consumption device of the hydrogen system; wherein the key parameter values ​​include: new hydrogen usage, circulating hydrogen usage, and emission hydrogen usage.

[0103] In another optional embodiment, the optimization module 24 is specifically used to: obtain the optimized operating parameters of the hydrogen system based on the preset hydrogenation reactor hydrogen-to-oil ratio and hydrogen partial pressure range, the hydrogen production capacity range of the hydrogen production device as constraints, and the hydrogen production cost and hydrogen use cost calculated online, with the total minimum hydrogen production cost and hydrogen use cost as the objective function;

[0104] Among them, the optimized operating parameters include: the hydrogen production capacity of the hydrogen production unit, the feed quantity and ratio of raw materials, the hydrogen-to-oil ratio and hydrogen partial pressure of the hydrogen user, the amount and composition of new hydrogen, the amount and composition of circulating hydrogen, the amount and composition of hydrogen discharged from the separator, the amount and composition of inlet and outlet streams of the hydrogen production unit, the amount of high-pressure and low-pressure hydrogen pipelines, and the amount of fuel gas delivered by the low-pressure hydrogen pipeline.

[0105] Based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the above-mentioned coupled process simulation and hydrogen pinch point hydrogen system online optimization method is implemented.

[0106] Based on the same inventive concept, a computer device is also provided in an embodiment of the present invention, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the above-mentioned coupled process simulation and hydrogen pinch point hydrogen system online optimization method is implemented.

[0107] Based on the same inventive concept, an embodiment of the present invention also provides an online optimization system for a hydrogen system that couples process simulation and hydrogen pinch points. The system may include: a hydrogen network of the hydrogen system, a refinery and chemical operation system, a laboratory information management system, and the above-mentioned online optimization device for the hydrogen system that couples process simulation and hydrogen pinch points; wherein the acquisition module of the online optimization device for the hydrogen system that couples process simulation and hydrogen pinch points is used to acquire real-time data of the refinery and chemical operation system and the laboratory information management system in real time, and provide the acquired real-time data to the online optimization model of the hydrogen system.

[0108] The principles of the problems solved by the above-mentioned devices, media, related equipment and systems in the embodiments of the present invention are similar to those of the above-mentioned methods, so their implementation can refer to the implementation of the above-mentioned methods, and the repeated parts will not be repeated.

[0109] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0110] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0113] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for online optimization of a hydrogen system by coupling process simulation and hydrogen pinch, characterized in that: include: Based on the parameters required for modeling the hydrogen production and consumption devices in the hydrogen system, a mathematical model of the hydrogen production and consumption devices of the hydrogen system is pre-built by simulation using process simulation software; a hydrogen network node model of the hydrogen system is pre-built; wherein, the mathematical model of the hydrogen production and consumption devices includes a mathematical model of a hydrogen production device and a mathematical model of a hydrogen consumption device; the parameters required for modeling the hydrogen production device of the hydrogen system include at least one of the following: raw material composition and flow rate of the hydrogen production device, hydrogen concentration at the reactor outlet, product gas yield and utility consumption; the parameters required for modeling the hydrogen consumption device of the hydrogen system include at least one of the following: raw material properties and flow rate of the hydrogen consumption device reactor, product properties and flow rate, circulating hydrogen composition and flow rate, new hydrogen composition and flow rate, hydrogen-to-oil ratio, separator pressure and temperature; Constructing a hydrogen network pinch point analysis and calculation model based on the hydrogen source and hydrogen sink flow rates, hydrogen purity, and the hydrogen network node model of the hydrogen system; Associating the mathematical model of the hydrogen production and consumption device with the hydrogen network pinch point analysis and calculation model to construct an online optimization model of the hydrogen system; Performing online monitoring and data analysis on the operating parameters of the hydrogen production and consumption device of the hydrogen system to obtain key parameter values ​​of the online optimization model of the hydrogen system, and adjusting the mathematical model of the hydrogen production and consumption device of the hydrogen system based on the key parameter values ​​and actual production values; According to the preset hydrogenation reactor hydrogen-to-oil ratio and hydrogen partial pressure range, and the hydrogen production capacity range of the hydrogen production device as constraint conditions, the hydrogen production cost and hydrogen use cost are calculated online based on the online optimization model of the hydrogen system, and the objective function is constructed with the total minimum hydrogen production cost and hydrogen use cost. The optimized operating parameters of the hydrogen system are obtained by solving the optimization constraint values ​​set by the mathematical model of the hydrogen production and consumption device of the hydrogen system, and the hydrogen system is optimized with the optimized operating parameters; wherein the optimized operating parameters include: hydrogen production of the hydrogen production device, feed amount and ratio of raw materials, hydrogen-to-oil ratio and hydrogen partial pressure of the hydrogen use device, new hydrogen amount and composition, circulating hydrogen amount and composition, separator hydrogen discharge amount and composition, the amount of high-pressure series low-pressure hydrogen pipeline network, and the amount of fuel gas delivered by the low-pressure hydrogen pipeline network; The mathematical model of the hydrogen by-product device in the hydrogen network node model is composed of the by-product hydrogen flow rate and the composition relationship as follows: Among them, the subscript Refers to a process unit that can produce hydrogen as a by-product. yes The total molar flow rate of hydrogen produced as a byproduct of the device process, yes The molar flow rate of component c in the by-product hydrogen of the device process, The molar composition of component c in the by-product hydrogen of the device process; The data relationship between the separation unit of the hydrogen purification device and the hydrogen compressor in the hydrogen network node model is: In the formula, , and Refers to the molar flow rates of separator feed, gas phase product and liquid phase product respectively; , and Refers to the molar composition of component C in the separator feed, gas phase product and liquid phase product respectively; The branch node model in the hydrogen network node model is: in, refers to the molar flow rate of component c of stream S entering the branch node, and Refers to the streams coming out of the branch node respectively and The molar flow rate of component c; Refers to the flow of stocks The branching ratio.

2. The method according to claim 1, characterized in that Also includes: Real-time data of the oil refining and chemical operation system and the laboratory information management system are acquired in real time, and the acquired real-time data is provided to the online optimization model of the hydrogen system.

3. The method according to claim 1, characterized in that: After constructing the hydrogen network pinch point analysis and calculation model, it also includes: By adopting iterative calculation method, the difference between the upper and lower areas of the hydrocarbon source and hydrocarbon sink combination diagram is made zero by reducing the highest concentration hydrocarbon source flow rate, so as to obtain the minimum utility hydrogen consumption and hydrogen pinch concentration.

4. The method according to claim 1, characterized in that Adjusting the mathematical model of the hydrogen production and consumption device of the hydrogen system includes: Based on the comparison result between the key parameter value and the actual production value, a comparison is made with a preset deviation threshold; if the comparison result is greater than the preset deviation threshold, the process simulation software simulates and calculates the component conversion rate of the hydrogen-using device to adjust the mathematical model of the hydrogen-producing and consuming device of the hydrogen system; Among them, the key parameter values ​​include: new hydrogen usage, circulating hydrogen usage, and exhaust hydrogen usage.

5. A hydrogen system online optimization device for coupling process simulation and hydrogen pinch point, characterized in that: include: A construction module is used to pre-build a mathematical model of the hydrogen production and consumption device of the hydrogen system based on the parameters required for modeling the hydrogen production and consumption device in the hydrogen system by using process simulation software; and to pre-build a hydrogen network node model of the hydrogen system; and, for constructing a cost accounting model for hydrogen production and consumption devices; and, for constructing a hydrogen network pinch point analysis and calculation model based on the hydrogen source and hydrogen sink flow rates and hydrogen purity of the hydrogen system; wherein, the mathematical model of the hydrogen production and consumption device includes a mathematical model of a hydrogen production device and a mathematical model of a hydrogen consumption device; the parameters required for modeling the hydrogen production device of the hydrogen system include at least one of the following: the composition and flow rate of the raw materials of the hydrogen production device, the hydrogen concentration at the reactor outlet, the product gas yield and the consumption of public works; the parameters required for modeling the hydrogen consumption device of the hydrogen system include at least one of the following: the properties and flow rate of the raw materials of the hydrogen consumption device reactor, the properties and flow rate of the products, the composition and flow rate of the circulating hydrogen, the composition and flow rate of the new hydrogen, the hydrogen-to-oil ratio, the separator pressure and temperature; An association module, used to associate the mathematical model of the hydrogen production and consumption device, the cost accounting model and the hydrogen network pinch point analysis and calculation model to construct an online optimization model of the hydrogen system; An online monitoring module, used for online monitoring and data analysis of operating parameters of the hydrogen production and consumption device of the hydrogen system, so as to obtain key parameter values ​​of the online optimization model of the hydrogen system, and adjust the mathematical model of the hydrogen production and consumption device of the hydrogen system based on the key parameter values ​​and actual production values; The optimization module is used to construct an objective function with the total minimum hydrogen production cost and hydrogen use cost based on the hydrogen production cost and hydrogen use cost calculated online based on the preset hydrogenation reactor hydrogen-to-oil ratio and hydrogen partial pressure range and the hydrogen production capacity range of the hydrogen production device as constraint conditions, and to obtain the optimized operating parameters of the hydrogen system by solving the constraint values ​​set by the mathematical model of the hydrogen production and consumption device of the hydrogen system according to the optimization, and optimize the hydrogen system with the optimized operating parameters; wherein the optimized operating parameters include: hydrogen production of the hydrogen production device, feed amount and ratio of raw materials, hydrogen-to-oil ratio and hydrogen partial pressure of the hydrogen use device, new hydrogen amount and composition, circulating hydrogen amount and composition, separator hydrogen discharge amount and composition, amount of high-pressure series low-pressure hydrogen pipeline network, and amount of fuel gas delivered by the low-pressure hydrogen pipeline network; The mathematical model of the hydrogen by-product device in the hydrogen network node model is composed of the by-product hydrogen flow rate and the composition relationship as follows: Among them, the subscript Refers to a process unit that can produce hydrogen as a by-product. yes The total molar flow rate of hydrogen produced as a byproduct of the device process, yes The molar flow rate of component c in the by-product hydrogen of the device process, The molar composition of component c in the by-product hydrogen of the device process; The data relationship between the separation unit of the hydrogen purification device and the hydrogen compressor in the hydrogen network node model is: In the formula, , and Refers to the molar flow rates of separator feed, gas phase product and liquid phase product respectively; , and Refers to the molar composition of component C in the separator feed, gas phase product and liquid phase product respectively; The branch node model in the hydrogen network node model is: in, refers to the molar flow rate of component c of stream S entering the branch node, and Refers to the flow streams coming out of the branch node respectively and The molar flow rate of component c; Refers to the flow of stocks The branching ratio.

6. The device according to claim 5, characterized in that Also includes: acquisition module, hydrogen pinch online analysis module and cost accounting module; The acquisition module is used to acquire real-time data from the oil refining and chemical operation system and the laboratory information management system, and provide the acquired real-time data to the online optimization model of the hydrogen system; The hydrogen pinch point online analysis module is used to adopt an iterative calculation method to reduce the highest concentration hydrocarbon source flow rate so that the difference between the upper and lower areas of the hydrocarbon source and hydrocarbon sink combination diagram is zero, so as to obtain the minimum utility hydrogen consumption and hydrogen pinch point concentration; The cost accounting module is used to calculate the hydrogen production cost and hydrogen usage cost online.

7. The device according to claim 6, characterized in that Also includes: Scheduling module and model management module; A scheduling module, used for starting and stopping the hydrogen system in the hydrogen network and processing load operations based on the optimized operating parameters of the hydrogen system obtained by the coupled process simulation and the hydrogen system online optimization device of the hydrogen pinch point; The model management module is used to manage and call the pre-established mathematical model of hydrogen production and consumption equipment, the hydrogen network node model and the online optimization model of the hydrogen system.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for online optimization of a hydrogen system with coupled process simulation and hydrogen pinch point as described in any one of claims 1 to 4 is implemented.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for online optimization of a hydrogen system with coupled process simulation and hydrogen pinch point according to any one of claims 1 to 4 is implemented.

10. A hydrogen system online optimization system for coupling process simulation and hydrogen pinch point, characterized in that: include: A hydrogen network for a hydrogen system, a system for obtaining refining and chemical operations, a laboratory information management system, and an online optimization device for a hydrogen system for coupling process simulation and hydrogen pinch points as described in any one of claims 5 to 7; Among them, the acquisition module of the hydrogen system online optimization device of the coupled process simulation and hydrogen pinch point is used to acquire real-time data of the refining and chemical operation system and the laboratory information management system in real time, and provide the acquired real-time data to the online optimization model of the hydrogen system.

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