Working medium optimization method, system, medium and equipment for offshore high-temperature waste heat organic Rankine cycle power generation system

Abstract

The invention relates to the field of industrial waste heat utilization, and discloses a working medium optimal selection method, system, medium and equipment for an offshore high-temperature waste heat organic Rankine cycle power generation system, and the method comprises the steps: preliminarily screening out an organic working medium adapting to an offshore high-temperature waste heat working condition according to a project heat source condition by taking an organic working medium preliminary screening technical index as a criterion; index weight calculation is carried out through an organic working medium comprehensive evaluation method, and scoring and decision making are carried out on each working medium; the comprehensive evaluation method comprises the steps of establishing a hierarchical structure model, constructing a judgment matrix, checking the consistency of the judgment matrix, calculating an index weight, comprehensively scoring and making a decision. And carrying out environmental health analysis on the organic working medium, carrying out safety and stability evaluation on the organic working medium, and screening out the ORC system organic working medium adapting to the special working condition of the offshore platform. Selection of the organic working medium of the offshore high-temperature waste heat organic Rankine cycle power generation system is achieved, and the economic benefits, safety and stability of the power generation system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial waste heat utilization, and in particular to a working fluid optimization method, system, medium and equipment for an offshore high-temperature waste heat organic Rankine cycle power generation system. Background Art

[0002] At present, the difficulties faced by the screening of organic working fluids for organic Rankine cycle technology on offshore platforms are as follows: (1) There are many evaluation indicators for organic working fluids. Comparing several indicators separately is not comprehensive and objective, and it is difficult to conduct a comprehensive evaluation of all indicators at the same time. (2) There is a lack of organic working fluid screening methods tailored to the characteristics of offshore platforms. The offshore platform environment is harsh, the space is limited, and the equipment is installed on a skid. It is affected by factors such as corrosion and oxidation, which places higher requirements on the selection of working fluids. (3) Traditional organic working fluid screening methods mainly rely on manual experience summary when allocating indicator weights, and cannot verify the rationality of weight allocation, resulting in the screening results being not objective enough. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a method, system, medium and equipment for optimizing the working fluid of an offshore high-temperature waste heat organic Rankine cycle power generation system, which realizes the selection of organic working fluids for the offshore high-temperature waste heat organic Rankine cycle power generation system and improves the economic benefits and safety and stability of the power generation system.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a method for optimizing working fluid for an offshore high-temperature waste heat organic Rankine cycle power generation system, comprising: according to the heat source conditions of the project, based on the preliminary screening technical indicators of organic working fluids, preliminarily screening out organic working fluids that are suitable for offshore high-temperature waste heat conditions; the preliminary screening technical indicators of organic working fluids include heat source conditions and physical properties of organic working fluids, the heat source conditions include flue gas temperature and heat transfer oil inlet and outlet temperatures, and the physical properties of organic working fluids include critical temperature, critical pressure and spontaneous combustion and / or ignition temperature; the weight of indicators is calculated by a comprehensive evaluation method for organic working fluids, and each working fluid is scored and decided; the comprehensive evaluation method includes establishing a hierarchical model, constructing a judgment matrix, checking the consistency of the judgment matrix and calculating the weight of indicators, comprehensively scoring and making decisions; conducting an environmental health analysis on the organic working fluid, and conducting a safety and stability performance evaluation on the organic working fluid, and screening out the organic working fluid of the ORC system that is suitable for the special working conditions of the offshore platform.

[0005] Furthermore, organic working fluids suitable for offshore high-temperature waste heat conditions were preliminarily selected, including: Cyclopentane, 1,1,1,3,3-pentafluoropropane, toluene, hexamethyldisiloxane, n-pentane, n-butane, isobutane, 1-fluoro-1,1-dichloroethane, cyclohexane, acetone, dichloromethane and 3-chloropropylene.

[0006] Furthermore, the hierarchical model includes the goal layer, criterion layer, indicator layer, and scheme layer; For the offshore high-temperature waste heat organic Rankine cycle power generation system, the target layer is the working fluid selection of the offshore high-temperature waste heat organic Rankine cycle power generation system; The criteria layer includes power generation benefits, offshore platform adaptability and economic assessment; The indicator layer includes net power generation, expander inlet volume flow, expander outlet volume flow and market price.

[0007] Further, construct a judgment matrix, including: Construct the criterion layer judgment matrix and calculate the weights of different criteria relative to the target layer; The rationality of the criterion layer judgment matrix is ​​determined through consistency testing; After determining the criterion layer judgment matrix, construct the indicator layer judgment matrix, calculate the weights of different indicators relative to the corresponding criteria, and perform consistency test on the indicator layer judgment matrix.

[0008] Furthermore, the consistency test includes: calculating the maximum eigenvalue of the judgment matrix, the consistency index, the random consistency index, and testing the consistency ratio.

[0009] Furthermore, the indicator weights are calculated by normalizing the column vectors of the judgment matrix and taking the arithmetic mean to calculate the weights of each indicator.

[0010] Furthermore, each working fluid is scored and decided, including: Compare various preliminarily selected organic working fluids horizontally, and set the optimal value of all working fluid parameters of a certain indicator as the full score; If the larger the index is, the more favorable it is, then the remaining working fluids will be scored according to the percentage relative to this value; If the smaller the index is, the more favorable it is, then the index is scored as a percentage relative to the rest of the working fluid values; Among them, the total score is 100 points.

[0011] A working fluid optimization system for an offshore high-temperature waste heat organic Rankine cycle power generation system comprises: a preliminary screening module, which preliminarily screens out organic working fluids suitable for offshore high-temperature waste heat working conditions based on project heat source conditions and organic working fluid preliminary screening technical indicators; the organic working fluid preliminary screening technical indicators include heat source conditions and organic working fluid physical property parameters, the heat source conditions include flue gas temperature and heat transfer oil inlet and outlet temperatures, and the organic working fluid physical property parameters include critical temperature, critical pressure and spontaneous combustion and / or ignition temperature; a scoring and decision-making module, which calculates index weights and scores and makes decisions on each working fluid through an organic working fluid comprehensive evaluation method; the comprehensive evaluation method comprises establishing a hierarchical model, constructing a judgment matrix, checking the consistency of the judgment matrix and calculating the index weights, comprehensively scoring and making decisions; a safety assessment module, which performs environmental health analysis on the organic working fluid, performs safety and stability performance assessment on the organic working fluid, and screens out organic working fluids for an ORC system suitable for special working conditions of an offshore platform.

[0012] A computer-readable storage medium storing one or more programs, wherein the one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform any of the above methods.

[0013] A computing device comprises: one or more processors, a memory and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any of the above methods.

[0014] The present invention adopts the above technical solution, which has the following advantages: 1. In view of the problem that there are many evaluation indicators for organic working fluids and it is difficult to comprehensively evaluate all the indicators at the same time, the present invention introduces the idea of ​​hierarchical analysis, establishes a hierarchical structure model, and constructs a judgment matrix. The weight of each indicator is calculated through the judgment matrix to achieve a comprehensive evaluation of each indicator of organic working fluids at the same time. The error caused by comparing individual indicators is reduced, and the objective accuracy of the screening results is improved.

[0015] 2. In view of the limited space on offshore platforms, the present invention takes into account the volume flow rate of the working fluid at the inlet and outlet of the expander during the comprehensive evaluation of the organic working fluid, so that the selected organic working fluid is more suitable for offshore application scenarios.

[0016] 3. In view of the problem that it is difficult to verify the rationality of weight allocation in traditional organic working fluid screening methods, the comprehensive evaluation method of the present invention performs a consistency check on the judgment matrix, which can effectively check the rationality of weight allocation and reduce the subjective influence caused by human experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a flow chart of a method for optimizing working fluids in an offshore high-temperature waste heat organic Rankine cycle power generation system according to an embodiment of the present invention; Figure 2 It is a hierarchical structure model for optimizing working fluids in an offshore high-temperature waste heat organic Rankine cycle power generation system in an embodiment of the present invention; Figure 3 It is a hierarchical structure model for selecting organic working fluids for offshore platforms in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] As the main energy-consuming equipment of the offshore platform, the main power station has considerable waste heat resources that can be recovered. Its energy efficiency improvement can not only reduce the consumption of energy such as crude oil and natural gas, achieve cost reduction and efficiency improvement, but also reduce carbon dioxide emissions, which is of great significance to the green and low-carbon development of offshore oil and gas fields under the "dual carbon" goal. The organic Rankine cycle system has the advantages of high power generation efficiency, low operation and maintenance costs, and high reliability. This technology requires the use of organic working fluids for heat exchange and expansion work. Selecting a suitable organic working fluid is one of the keys to the successful operation of the organic Rankine cycle system. Traditional screening methods for organic working fluids mainly include manual experience summary, experimental comparison, thermodynamic simulation analysis, etc. These methods are generally difficult to ensure the highest power generation efficiency and economic benefits, and are not oriented to special working conditions of offshore platforms. The newly born algorithm framework method for selecting working fluids remains in the theoretical stage, lacks practical application, and has low reliability. Overall, the organic Rankine cycle technology lacks a screening method for organic working fluids suitable for offshore platforms.

[0019] In order to solve the problems existing in the existing working fluid screening, the present invention provides a method, system, medium and equipment for optimizing the working fluid of an offshore high-temperature waste heat organic Rankine cycle power generation system, including: preliminary screening of working fluids based on the heat source conditions of the project, with critical temperature, critical pressure, spontaneous combustion or ignition temperature as the standard; by establishing a hierarchical model, constructing a judgment matrix and performing consistency tests, calculating index weights, and conducting a comprehensive evaluation of the preliminarily screened organic working fluids. The present invention can evaluate the environmental friendliness, safety and stability of organic working fluids, and ultimately screen out organic working fluids for the ORC system that are suitable for the special working conditions of offshore platforms. The selection of organic working fluids for offshore high-temperature waste heat organic Rankine cycle power generation systems is achieved, and the economic benefits and safety and stability of the power generation system are improved.

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] In one embodiment of the present invention, a method for selecting working fluids for an offshore high-temperature waste heat organic Rankine cycle power generation system is provided. Figure 1 As shown, the method comprises the following steps: 1) Based on the heat source conditions of the project and the technical indicators for preliminary screening of organic working fluids, preliminarily screen out organic working fluids that are suitable for offshore high-temperature waste heat conditions; Among them, the preliminary screening technical indicators of organic working fluids include heat source conditions and physical properties of organic working fluids. The heat source conditions include flue gas temperature and heat transfer oil inlet and outlet temperatures. The physical properties of organic working fluids include critical temperature, critical pressure and auto-ignition and / or ignition temperature.

[0023] 2) Calculate the index weights through the comprehensive evaluation method of organic working fluids and make scores and decisions on each working fluid; Among them, the comprehensive evaluation method includes establishing a hierarchical model, constructing a judgment matrix, checking the consistency of the judgment matrix and calculating the indicator weights, comprehensively scoring and making decisions.

[0024] 3) Conduct environmental health analysis on organic working fluids, and evaluate their safety and stability performance, and select organic working fluids for the ORC system that are suitable for the special working conditions of offshore platforms.

[0025] In the above step 1), organic working fluids suitable for offshore high-temperature waste heat conditions are preliminarily screened out, specifically: cyclopentane, 1,1,1,3,3-pentafluoropropane, toluene, hexamethyldisiloxane, n-pentane, n-butane, isobutane, 1-fluoro-1,1-dichloroethane, cyclohexane, acetone, dichloromethane and 3-chloropropylene.

[0026] Specifically, the technical indicators for the preliminary screening of organic working fluids include heat source conditions, with critical temperature and spontaneous combustion / ignition temperature as standards. In this embodiment, the heat source condition is a flue gas temperature of 451°C. Considering the inlet and outlet temperatures of the heat transfer oil, the critical temperature is higher than 130°C and the spontaneous combustion or ignition temperature is higher than 310°C as standards. Cyclopentane, 1,1,1,3,3-pentafluoropropane, toluene, hexamethyldisiloxane, n-pentane, n-butane, isobutane, 1-fluoro-1,1-dichloroethane, cyclohexane, acetone, dichloromethane and 3-chloropropylene are initially selected. The above-mentioned working fluids belong to Freon, alkane, aromatic hydrocarbons, siloxane and ketone respectively.

[0027] In the above step 2), if Figure 2 As shown, the hierarchical model includes the target layer, the criterion layer, the indicator layer and the solution layer. The target layer is the purpose of decision-making and the problem to be solved. The criterion layer is the factors to be considered when making decisions and the criteria for decision-making. The indicator layer is the indicators used in decision-making calculations. The solution layer is the various alternative solutions for making decisions. According to different conditions in different projects, the various conditions considered when optimizing the working fluid can be adjusted. Among them: For the offshore high-temperature waste heat organic Rankine cycle power generation system, the target layer is the working fluid selection of the offshore high-temperature waste heat organic Rankine cycle power generation system; The criteria layer includes power generation benefits, offshore platform adaptability and economic assessment; The indicator layer includes net power generation, expander inlet volume flow, expander outlet volume flow and market price.

[0028] Specifically, a hierarchical model for selecting organic working fluids for offshore platforms is established, such as Figure 3 As shown, the decision-making purpose of this embodiment is to select an organic working fluid that is suitable for the offshore high-temperature waste heat organic Rankine cycle power generation system, so the target layer is the selection of organic working fluids for offshore platforms; when selecting organic working fluids, factors to be considered include power generation capacity, offshore platform adaptability and economy. Therefore, the criterion layer includes power generation efficiency, offshore platform adaptability and economic evaluation; the indicator for considering power generation efficiency is net power generation. The adaptability of offshore platforms is mainly reflected in the scarcity of space on offshore platforms. The smaller the volume of the expander inlet and outlet, the more it can reduce the piping volume, and reduce the space and weight of the ORC system. Therefore, the indicator layer of offshore platform adaptability is the expander inlet volume flow rate and outlet volume flow rate. The economic evaluation indicator is the market price of each working fluid.

[0029] In the above step 2), first construct the criterion layer judgment matrix, and calculate the weights of different criteria relative to the target layer. And judge the rationality of the criterion layer judgment matrix through consistency test. After determining the criterion layer judgment matrix, construct the indicator layer judgment matrix, calculate the weights of different indicators relative to the corresponding criteria, and perform consistency test on the indicator layer judgment matrix.

[0030] In this embodiment, when determining the weight of each criterion, the criteria are compared in pairs, and based on the expert's advice, the relative importance of each criterion in the criterion layer is determined using scales 1 to 9. Scale 1 indicates that two factors are equally important. Scale 3 indicates that one factor is slightly more important than another factor. Scale 5 indicates that one factor is significantly more important than another factor. Scale 7 indicates that one factor is strongly more important than another factor. Scale 9 indicates that one factor is extremely more important than another factor. The remaining values ​​are between the medians of the above adjacent judgments.

[0031] factor and The comparative judgment is ,factor and Comparative judgment . From this, we can construct the judgment matrix :

[0032] For the offshore high-temperature waste heat organic Rankine cycle power generation system, the scale of power generation efficiency compared with the adaptability of the offshore platform is selected as 6, the scale compared with the economic assessment is selected as 9, and the scale of offshore platform adaptability compared with the economic assessment is selected as 4.

[0033] Specifically, in this example, the power generation benefit, offshore platform adaptability, and economic evaluation are set as , , According to the expert's suggestion, power generation benefit is the most important indicator of the offshore platform ORC system. Compared with the adaptability of the offshore platform, the scale is selected as 6, compared with the economic evaluation, the scale is selected as 9, and the scale of the adaptability of the offshore platform compared with the economic evaluation is selected as 4. Therefore, the judgment matrix can be constructed :

[0034] In the above step 2), the consistency test includes: calculating the maximum eigenvalue of the judgment matrix, the consistency index, the random consistency index, and testing the consistency ratio.

[0035] Specifically, in order to verify the rationality of the judgment matrix, it is necessary to perform a consistency test on it. The consistency index is :

[0036] in is the maximum eigenvalue of the judgment matrix, is the order of the judgment matrix. , it is believed that the judgment matrix has complete consistency. Close to 0, with satisfactory consistency. The larger it is, the more serious the inconsistency.

[0037] The consistency ratio is :

[0038] in is a random consistency indicator, which can be obtained by looking up a table. When , the inconsistency of the judgment matrix is ​​within the allowable range and passes the consistency test. , , , . Therefore, the judgment matrix passes the consistency test.

[0039] In the above step 2), the indicator weights are calculated by normalizing the column vectors of the judgment matrix and calculating the weights of each indicator by taking the arithmetic mean.

[0040] Specifically, in order to simplify the calculation, the column vector is normalized and the arithmetic average is taken to calculate the weight of each indicator.

[0041]

[0042] Take the arithmetic mean to calculate the indicator weight:

[0043] The product of the criterion layer weight and the indicator layer weight is the weight of a certain indicator relative to the target layer, that is, the weight of the indicator when it is comprehensively scored.

[0044] In this embodiment , , They are the weights of power generation efficiency, offshore platform adaptability, and economic evaluation in the criterion layer: Column vector normalization:

[0045] Take the arithmetic mean to calculate the indicator weight:

[0046] After calculation, the weight of power generation benefit in the criterion layer is 0.751, the weight of offshore platform adaptability is 0.184, and the weight of economic evaluation is 0.065. In this example, due to the small number of indicators, it is not necessary to construct a judgment matrix of the indicator layer relative to the criterion layer. , , , They are the weights of net power generation, expander inlet volume flow, expander outlet volume flow, and market price in the indicator layer. Net power generation is the only indicator of power generation efficiency, and its weight is equal to the weight of power generation efficiency, which is 0.751. Considering that the expander inlet volume flow and outlet volume flow are equally important, their weights are both 0.092. Market price is the only indicator in economic evaluation, and its weight is equal to the economic evaluation weight, which is 0.065.

[0047] In the above step 2), scoring and decision making for each working fluid include the following steps: 2.1) Compare various pre-selected organic working fluids horizontally, and set the optimal value of all working fluid parameters of a certain indicator as the full score; 2.2) If the larger the index is, the more favorable it is, then the remaining working fluids will be scored according to the percentage relative to this value; 2.3) If the smaller the index is, the more favorable it is, then the index will be scored as a percentage of the remaining working fluid values; the total score is 100 points.

[0048] Specifically, for example, assuming the net power generation is ; The volume flow rate at the expander inlet is ; The volume flow rate at the expander outlet is ; The market price is The overall score is , the full score is 100 points; , , , These are the scores obtained by each organic working fluid in four aspects: net power generation power, expander inlet volume flow rate, expander outlet volume flow rate, and market price.

[0049] If this indicator (net power generation P ) is larger, the more beneficial it is to improve power generation efficiency, then the net power generation score is:

[0050] If the expander volume flow The smaller the index is, the more conducive it is to reducing the volume of equipment such as offshore platform expanders, piping, and heat exchangers, and improving the adaptability of offshore platforms. The expander inlet volume flow rate score is:

[0051] Expander outlet volume flow rating:

[0052] Market Price Rating:

[0053] Overall rating:

[0054] Finally, the sum of all the index scores of a working fluid is the comprehensive evaluation score of the working fluid, and the organic working fluid with the highest score is the optimal working fluid.

[0055] The calculated scores of each organic working fluid are shown in Table 1.

[0056] Table 1 Comprehensive evaluation results of organic working fluids

[0057] According to the above results, through comprehensive evaluation, cyclopentane has a total score of 89.841, the highest score. In this example, cyclopentane should be selected as the organic working fluid for ORC system power generation.

[0058] In the above step 3), an environmental health analysis is conducted to determine the impact on the ecosystem, workers, and production equipment through ODP, GWP, etc. If there are strong safety and ecological risks, the subsequent organic working fluids should be selected based on the comprehensive score ranking.

[0059] Specifically, cyclopentane is a new foaming agent for rigid polyurethane foam, used to replace chlorofluorocarbons (CFCs) that damage the atmospheric ozone layer. It is now widely used in the production of fluorine-free refrigerators, freezers, cold storage, and pipeline insulation. It is easy to obtain, basically harmless to workers, and highly safe. Cyclopentane has an ODP of 0 and a GWP of 11. It will not damage the ozone layer and has little impact on the greenhouse effect. At the same time, cyclopentane is a dry working fluid. When it expands and does work in the expander, it will not produce droplets and has little corrosive effect on the expander. Therefore, cyclopentane has no negative impact on the ecological environment, workers, and production equipment.

[0060] In summary, through preliminary screening of organic working fluids, comprehensive evaluation and environmental health analysis, this embodiment selects cyclopentane as the working fluid for circulation.

[0061] In one embodiment of the present invention, a working fluid optimization system for an offshore high-temperature waste heat organic Rankine cycle power generation system is provided, comprising: The preliminary screening module, based on the heat source conditions of the project and the technical indicators for preliminary screening of organic working fluids, preliminarily screens out organic working fluids that are suitable for offshore high-temperature waste heat conditions; the technical indicators for preliminary screening of organic working fluids include heat source conditions and physical properties of organic working fluids. The heat source conditions include flue gas temperature and heat transfer oil inlet and outlet temperatures, and the physical properties of organic working fluids include critical temperature, critical pressure, and spontaneous combustion and / or ignition temperature; The scoring and decision-making module calculates the index weights and scores and makes decisions on each working fluid through the comprehensive evaluation method of organic working fluids; the comprehensive evaluation method includes establishing a hierarchical model, constructing a judgment matrix, checking the consistency of the judgment matrix and calculating the index weights, comprehensively scoring and making decisions; The safety assessment module conducts environmental health analysis on organic working fluids, and performs safety and stability performance assessment on organic working fluids, and selects organic working fluids for the ORC system that are suitable for the special working conditions of offshore platforms.

[0062] In the above embodiments, organic working fluids suitable for high-temperature waste heat conditions at sea are preliminarily screened out, including: cyclopentane, 1,1,1,3,3-pentafluoropropane, toluene, hexamethyldisiloxane, n-pentane, n-butane, isobutane, 1-fluoro-1,1-dichloroethane, cyclohexane, acetone, dichloromethane and 3-chloropropylene.

[0063] In the above embodiment, the hierarchical structure model includes a target layer, a criterion layer, an indicator layer, and a solution layer; For the offshore high-temperature waste heat organic Rankine cycle power generation system, the target layer is the working fluid selection of the offshore high-temperature waste heat organic Rankine cycle power generation system; The criteria layer includes power generation benefits, offshore platform adaptability and economic assessment; The indicator layer includes net power generation, expander inlet volume flow, expander outlet volume flow and market price.

[0064] In the above embodiment, constructing a judgment matrix includes: Construct the criterion layer judgment matrix and calculate the weights of different criteria relative to the target layer; The rationality of the criterion layer judgment matrix is ​​determined through consistency testing; After determining the criterion layer judgment matrix, construct the indicator layer judgment matrix, calculate the weights of different indicators relative to the corresponding criteria, and perform consistency test on the indicator layer judgment matrix.

[0065] In the above embodiment, the consistency check includes: calculating the maximum eigenvalue of the judgment matrix, the consistency index, the random consistency index, and checking the consistency ratio.

[0066] In the above embodiment, the weight of the indicator is calculated by normalizing the column vector of the judgment matrix and calculating the weight of each indicator by taking the arithmetic mean.

[0067] In the above embodiment, scoring and decision making for each working fluid include: Compare various preliminarily selected organic working fluids horizontally, and set the optimal value of all working fluid parameters of a certain indicator as the full score; If the larger the index is, the more favorable it is, then the remaining working fluids will be scored according to the percentage relative to this value; If the smaller the index is, the more favorable it is, then the index is scored as a percentage relative to the rest of the working fluid values; Among them, the total score is 100 points.

[0068] The system provided in this embodiment is used to execute the above-mentioned method embodiments. Please refer to the above-mentioned embodiments for specific processes and detailed contents, which will not be repeated here.

[0069] In one embodiment of the present invention, a computing device is provided, which may be a terminal, and may include: a processor, a communication interface, a memory, a display screen, and an input device. Among them, the processor, the communication interface, and the memory communicate with each other through a communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium and an internal memory, and the non-volatile storage medium stores an operating system and a computer program. When the computer program is executed by the processor, the method in each of the above embodiments is implemented; the internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a management network, NFC (near field communication) or other technologies. The display screen may be a liquid crystal display screen or an electronic ink display screen, and the input device may be a touch layer covered on the display screen, or a key, trackball or touchpad provided on the housing of the computing device, or an external keyboard, touchpad or mouse, etc. The processor may call the logic instructions in the memory.

[0070] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0071] In one embodiment of the present invention, a computer program product is provided, wherein the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments.

[0072] In one embodiment of the present invention, a non-transitory computer-readable storage medium is provided, wherein the non-transitory computer-readable storage medium stores server instructions, and the computer instructions enable a computer to execute the methods provided in the above embodiments.

[0073] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0074] 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.

[0075] 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.

[0076] 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 The steps for the functions specified in one or more boxes.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 invention.

Claims

1. A method for optimizing working fluid for an offshore high-temperature waste heat organic Rankine cycle power generation system, characterized in that: include: According to the heat source conditions of the project, the organic working fluids suitable for offshore high-temperature waste heat conditions are preliminarily screened based on the preliminary screening technical indicators of organic working fluids. The preliminary screening technical indicators of organic working fluids include heat source conditions and physical property parameters of organic working fluids. The heat source conditions include flue gas temperature and heat transfer oil inlet and outlet temperatures. The physical property parameters of organic working fluids include critical temperature, critical pressure and spontaneous combustion and / or ignition temperature. The weight of indicators is calculated through the comprehensive evaluation method of organic working fluids, and each working fluid is scored and decided; the comprehensive evaluation method includes establishing a hierarchical model, constructing a judgment matrix, checking the consistency of the judgment matrix and calculating the weight of indicators, scoring comprehensively and making decisions; Conduct environmental health analysis on organic working fluids, and evaluate their safety and stability performance to select organic working fluids for the ORC system that are suitable for the special working conditions of offshore platforms.

2. The method for selecting working fluid for an offshore high temperature waste heat organic Rankine cycle power generation system according to claim 1, characterized in that: The organic working fluids suitable for offshore high-temperature waste heat conditions were initially selected, including: Cyclopentane, 1,1,1,3,3-pentafluoropropane, toluene, hexamethyldisiloxane, n-pentane, n-butane, isobutane, 1-fluoro-1,1-dichloroethane, cyclohexane, acetone, dichloromethane and 3-chloropropylene.

3. The method for optimizing working fluid for offshore high temperature waste heat organic Rankine cycle power generation system according to claim 1, characterized in that: The hierarchical model includes the goal layer, the criterion layer, the indicator layer, and the program layer; For the offshore high-temperature waste heat organic Rankine cycle power generation system, the target layer is the working fluid selection of the offshore high-temperature waste heat organic Rankine cycle power generation system; The criteria layer includes power generation benefits, offshore platform adaptability and economic assessment; The indicator layer includes net power generation, expander inlet volume flow, expander outlet volume flow and market price.

4. The method for selecting working fluid for an offshore high temperature waste heat organic Rankine cycle power generation system according to claim 3, characterized in that: Construct a judgment matrix, including: Construct the criterion layer judgment matrix and calculate the weights of different criteria relative to the target layer; The rationality of the criterion layer judgment matrix is ​​determined through consistency testing; After determining the criterion layer judgment matrix, construct the indicator layer judgment matrix, calculate the weights of different indicators relative to the corresponding criteria, and perform consistency test on the indicator layer judgment matrix.

5. The method for selecting working fluid for an offshore high temperature waste heat organic Rankine cycle power generation system according to claim 1, characterized in that: The consistency test includes: calculating the maximum eigenvalue of the judgment matrix, the consistency index, the random consistency index, and testing the consistency ratio.

6. The method for selecting working fluid for an offshore high-temperature waste heat organic Rankine cycle power generation system according to claim 1, characterized in that: The indicator weights are calculated by normalizing the column vectors of the judgment matrix and taking the arithmetic mean to calculate the weights of each indicator.

7. The method for selecting working fluid for an offshore high temperature waste heat organic Rankine cycle power generation system according to claim 1, characterized in that: Score and make decisions on each working fluid, including: Compare various preliminarily selected organic working fluids horizontally, and set the optimal value of all working fluid parameters of a certain indicator as the full score; If the larger the index is, the more favorable it is, then the remaining working fluids will be scored according to the percentage relative to this value; If the smaller the index is, the more favorable it is, then the index is scored as a percentage relative to the rest of the working fluid values; Among them, the total score is 100 points.

8. A working fluid optimization system for an offshore high-temperature waste heat organic Rankine cycle power generation system, characterized in that: include: The preliminary screening module, based on the heat source conditions of the project and the technical indicators for preliminary screening of organic working fluids, preliminarily screens out organic working fluids that are suitable for offshore high-temperature waste heat conditions; the technical indicators for preliminary screening of organic working fluids include heat source conditions and physical properties of organic working fluids. The heat source conditions include flue gas temperature and heat transfer oil inlet and outlet temperatures, and the physical properties of organic working fluids include critical temperature, critical pressure, and spontaneous combustion and / or ignition temperature; The scoring and decision-making module calculates the index weights and scores and makes decisions on each working fluid through the comprehensive evaluation method of organic working fluids; the comprehensive evaluation method includes establishing a hierarchical model, constructing a judgment matrix, checking the consistency of the judgment matrix and calculating the index weights, comprehensively scoring and making decisions; The safety assessment module conducts environmental health analysis on organic working fluids, and performs safety and stability performance assessment on organic working fluids, and selects organic working fluids for the ORC system that are suitable for the special working conditions of offshore platforms.

9. A computer-readable storage medium storing one or more programs, characterized in that: The one or more programs include instructions, which, when executed by a computing device, cause the computing device to perform any one of the methods of claims 1 to 7.

10. A computing device, characterized in that include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs include instructions for executing any one of the methods described in claims 1 to 7.

Images