High-temperature pipeline variable working condition performance evaluation method and related device
By acquiring and calculating the design and current operating parameters of high-temperature pipelines, and setting target values for pressure loss and enthalpy drop, the problem of difficult monitoring of performance degradation of high-temperature pipelines in thermal power generation systems is solved, enabling rapid and accurate assessment and diagnosis under varying operating conditions.
Patent Information
- Application Number
- CN202510973550.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2025-11-07
AI Technical Summary
In thermal power generation systems, the hydraulic and thermal performance of high-temperature pipelines deteriorates due to factors such as scaling, corrosion, internal leakage of valves, and aging of insulation materials. It is impossible to judge this by directly comparing the pressure loss and enthalpy drop under the current operating conditions with those under new operating conditions, especially under changing operating conditions where performance changes are difficult to monitor.
By acquiring pipeline information under design and current operating conditions, parameters such as pressure loss, enthalpy drop, and average specific volume are calculated. Target values for pressure loss and enthalpy drop are set, and deviations are used to determine whether the hydraulic and thermal performance of the pipeline has deteriorated. Evaluation is conducted using calculation modules and devices.
It enables rapid and accurate assessment of performance changes in high-temperature pipelines under varying operating conditions, simplifies the calculation process, and improves the accuracy of monitoring and diagnosis. It is applicable to performance monitoring of high-temperature pipelines and variable operating condition calculations of thermal systems.
Smart Images
Figure CN120911076A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of monitoring and diagnosing components of thermal power generation systems, and relates to a high-temperature pipeline variable working condition performance evaluation method and related device. BACKGROUND
[0002] In a thermal power generation system, the heat energy transmission between core devices (such as boilers, steam turbines, etc.) is realized through high-temperature pipelines. Due to the influence of factors such as pipeline fouling and corrosion, valve internal leakage, aging and damage of thermal insulation materials, etc., after long-term operation, the hydraulic and thermal performance of the high-temperature pipeline may be deteriorated compared with a brand-new pipeline, which is specifically manifested as abnormal pressure loss and enthalpy drop of the pipeline. This not only directly leads to the decline of the efficiency of the entire thermal system, resulting in additional economic losses, but also may cause certain safety hazards. Therefore, it is crucial to monitor and diagnose the performance change of the high-temperature pipeline in real time. However, due to the scheduling requirements and operating boundary differences of the power grid, the thermal power generation system is often in a variable working condition, and the boundary parameters (flow rate, temperature and pressure) of the high-temperature pipeline and the environmental temperature also change constantly. Therefore, it is impossible to judge whether the hydraulic and thermal performance of the high-temperature pipeline is deteriorated by directly comparing the pressure loss and enthalpy drop of the high-temperature pipeline under the current working condition with those under the brand-new working condition. SUMMARY
[0003] The purpose of the present application is to overcome the above-mentioned shortcomings of the prior art, and to provide a high-temperature pipeline variable working condition performance evaluation method and related device, which can evaluate whether the hydraulic performance and thermal performance of the high-temperature pipeline are deteriorated.
[0004] To achieve the above-mentioned purpose, the present application discloses a high-temperature pipeline variable working condition performance evaluation method, comprising:
[0005] obtaining pipeline information under a design working condition and pipeline information under a current working condition;
[0006] calculating the pressure loss and enthalpy drop of the pipeline under the design working condition and the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition;
[0007] calculating the average specific volume of the pipeline under the design working condition and the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition;
[0008] calculating a pressure loss target value of the pipeline under the current working condition according to the pressure loss under the design working condition, the mass flow rate and the average specific volume of the pipeline under the design working condition and the current working condition;
[0009] calculating an enthalpy drop target value of the pipeline under the current working condition according to the inlet and outlet temperatures of the pipeline under the design working condition and the current working condition, the environmental temperature and the mass flow rate, and the calculated enthalpy drop of the pipeline under the design working condition;
[0010] Compare the pressure loss of the pipeline under the current working condition with the pressure loss target value of the pipeline under the current working condition, and judge whether the hydraulic performance of the pipeline is deteriorated according to the comparison result;
[0011] Compare the enthalpy drop of the pipeline under the current working condition with the enthalpy drop target value of the pipeline under the current working condition, and judge whether the thermal performance of the pipeline is deteriorated according to the comparison result.
[0012] The high-temperature pipeline variable working condition performance evaluation method further improves in that:
[0013] Further, the pipeline information under the design working condition includes the ambient temperature under the design working condition The inlet pressure of the pipeline Temperature And flow And the outlet pressure of the pipeline Temperature And flow
[0014] The pipeline information under the current working condition includes the ambient temperature under the current working condition The inlet pressure of the pipeline Temperature And flow And the outlet pressure of the pipeline Temperature And flow
[0015] Further, the pressure loss of the pipeline under the design working condition is:
[0016]
[0017] The enthalpy drop of the pipeline under the design working condition is:
[0018]
[0019] Further, the pressure loss of the pipeline under the current working condition is:
[0020]
[0021] The enthalpy drop of the pipeline under the current working condition is:
[0022]
[0023] Further, the pressure loss target value of the pipeline under the current working condition is:
[0024]
[0025] Wherein, And respectively, are the average specific volumes of the pipeline at the current working condition and the design working condition;
[0026]
[0027] Further, the enthalpy drop target value of the pipeline at the current working condition is:
[0028]
[0029] Further, the process of comparing the pressure loss of the pipeline at the current working condition with the pressure loss target value of the pipeline at the current working condition, and judging whether the hydraulic performance of the pipeline is deteriorated according to the comparison result is:
[0030] Calculate the deviation err of the pressure loss of the pipeline at the current working condition and the target value DP :
[0031]
[0032] When err DP is less than 3%, it is considered that the flow resistance of the pipeline is normal, otherwise, it is considered that the flow resistance of the pipeline is abnormal, and the hydraulic performance of the pipeline is deteriorated.
[0033] Further, the process of comparing the enthalpy drop of the pipeline at the current working condition with the enthalpy drop target value of the pipeline at the current working condition, and judging whether the thermal performance of the pipeline is deteriorated according to the comparison result is:
[0034] Calculate the deviation err of the enthalpy drop of the pipeline at the current working condition and the target value DH :
[0035]
[0036] When err DH is less than 3%, it is considered that the thermal insulation material of the pipeline is normal, otherwise, it is considered that the thermal insulation material of the pipeline is abnormal, and the thermal performance of the pipeline is deteriorated.
[0037] The application discloses a high-temperature pipeline variable working condition performance evaluation system, comprising:
[0038] An acquisition module is configured to acquire pipeline information at a design working condition and pipeline information at a current working condition;
[0039] A first calculation module is configured to calculate pressure loss and enthalpy drop of the pipeline at the design working condition and the current working condition according to the pipeline information at the design working condition and the pipeline information at the current working condition;
[0040] A second calculation module is configured to calculate average specific volumes of the pipeline at the design working condition and the current working condition according to the pipeline information at the design working condition and the pipeline information at the current working condition;
[0041] The third calculation module is configured to calculate a pressure loss target value of the pipeline under the current working condition according to the pressure loss under the design working condition, the mass flow and the average specific volume of the pipeline under the design working condition and the current working condition;
[0042] The fourth calculation module is configured to calculate an enthalpy drop target value of the pipeline under the current working condition according to the inlet and outlet temperatures, the ambient temperature and the mass flow of the pipeline under the design working condition and the current working condition.
[0043] The first comparison module is configured to compare the pressure loss of the pipeline under the current working condition with the pressure loss target value of the pipeline under the current working condition, and determine whether the hydraulic performance of the pipeline is deteriorated according to a comparison result.
[0044] The second comparison module is configured to compare the enthalpy drop of the pipeline under the current working condition with the enthalpy drop target value of the pipeline under the current working condition, and determine whether the thermal performance of the pipeline is deteriorated according to a comparison result.
[0045] The application discloses a computer device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the high-temperature pipeline variable working condition performance evaluation method when executing the computer program.
[0046] The application discloses a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the high-temperature pipeline variable working condition performance evaluation method when executed by a processor.
[0047] The application has the following beneficial effects:
[0048] The high-temperature pipeline variable working condition performance evaluation method and the related device have the following advantages: the hydraulic performance of the pipeline is determined according to the comparison result of the pressure loss of the pipeline under the current working condition and the pressure loss target value of the pipeline under the current working condition, the thermal performance of the pipeline is determined according to the comparison result of the enthalpy drop of the pipeline under the current working condition and the enthalpy drop target value of the pipeline under the current working condition, the calculation process is simple, iteration is not needed, the calculation rate is fast, the accuracy is high, and the method can be used in the fields of performance monitoring, diagnosis and prediction of high-temperature pipelines and variable working condition calculation of thermal systems. BRIEF DESCRIPTION OF DRAWINGS
[0049] The drawings accompanying the specification of the application serve to provide a further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application, and do not constitute an improper limitation on the application. In the drawings:
[0050] Figure 1 FIG. 1 is a schematic diagram of ambient temperatures and pipeline boundary parameters under a design working condition and a current working condition; and
[0051] Figure 2 The method flowchart of the present application. DETAILED DESCRIPTION
[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0053] In the description of the present application, it should be understood that the terms "comprising" and "including" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or sets thereof.
[0054] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, unless otherwise clearly indicated by the context, the singular forms "a", "an" and "the" are intended to include the plural forms as well.
[0055] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.
[0056] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present application to describe the preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, the first preset range can also be referred to as the second preset range, and similarly, the second preset range can also be referred to as the first preset range without departing from the scope of the embodiments of the present application.
[0057] Depending on the context, the word "if" as used herein can be interpreted as meaning "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (a stated condition or event)" can be interpreted as meaning "when determined" or "in response to determining" or "when detecting (a stated condition or event)" or "in response to detecting (a stated condition or event)".
[0058] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0059] Various structural schematic diagrams according to the disclosed embodiments of the present application are shown in the drawings. These diagrams are not drawn to scale, in which some details are enlarged for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and their relative size and positional relationship shown in the drawings are only exemplary, and in actuality, there can be deviations due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.
[0060] Embodiment one
[0061] Reference Figure 1 And Figure 2 The high-temperature pipeline variable working condition performance evaluation method of the present application comprises the following steps:
[0062] 1) Obtain pipeline information under a design working condition and pipeline information under a current working condition, wherein the pipeline information under the design working condition comprises an environmental temperature Inlet pressure of the pipeline Temperature And flow rate And outlet pressure of the pipeline Temperature And flow rate
[0063] The pipeline information under the current working condition comprises an environmental temperature Inlet pressure of the pipeline Temperature And flow rate And outlet pressure of the pipeline Temperature And flow rate
[0064] 2) Calculate pressure loss and enthalpy drop of the pipeline under the design working condition and the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition;
[0065] 3) According to the pipeline information under the design working condition and the pipeline information under the current working condition, the average specific volume of the pipeline under the design working condition and the current working condition is calculated;
[0066] 4) According to the pressure loss of the pipeline under the design working condition calculated in step 2), the average specific volume of the pipeline under the design working condition and the current working condition calculated in step 3), and the mass flow of the pipeline under the design working condition and the current working condition, the target value of the pressure loss of the pipeline under the current working condition is calculated;
[0067] 5) According to the inlet and outlet temperature, ambient temperature and mass flow of the pipeline under the design working condition and the current working condition, and the enthalpy drop of the pipeline under the design working condition calculated in step 2), the target value of the enthalpy drop of the pipeline under the current working condition is calculated;
[0068] 6) The pressure loss of the pipeline under the current working condition calculated in step 2) is compared with the target value of the pressure loss of the pipeline under the current working condition calculated in step 4), and when the relative deviation between the two is not more than 3%, it is considered that the flow resistance of the pipeline is normal, otherwise, it is considered that the flow resistance of the pipeline is abnormal, and the hydraulic performance is deteriorated;
[0069] 7) The enthalpy drop of the pipeline under the current working condition calculated in step 2) is compared with the target value of the enthalpy drop of the pipeline under the current working condition calculated in step 5), and when the relative deviation between the two is not more than 3%, it is considered that the thermal insulation material of the pipeline is normal, otherwise, it is considered that the thermal insulation material of the pipeline is abnormal, and the thermal performance is deteriorated.
[0070] The pressure loss of the pipeline under the design working condition is:
[0071]
[0072] The enthalpy drop of the pipeline under the design working condition is:
[0073]
[0074] The pressure loss of the pipeline under the current working condition is:
[0075]
[0076] The enthalpy drop of the pipeline under the current working condition is:
[0077]
[0078] The target value of the pressure loss of the pipeline under the current working condition is:
[0079]
[0080] wherein, and The average inlet and outlet volumes of the pipeline under current operating conditions and design operating conditions are respectively:
[0081]
[0082] The target value for enthalpy drop in the pipeline under current operating conditions is:
[0083]
[0084] Determine the deviation (err) between the pipeline pressure loss and the target value under the current operating conditions. DP :
[0085]
[0086] When err DP If the flow resistance is less than 3%, the flow resistance of the pipeline is considered normal; otherwise, the flow resistance of the pipeline is considered abnormal, and the hydraulic performance has deteriorated.
[0087] Determine the deviation (err) between the enthalpy drop of the pipeline under current operating conditions and the target enthalpy drop value. DH :
[0088]
[0089] When err DH If the percentage is less than 3%, the insulation material of the pipeline is considered to be normal; otherwise, the insulation material of the pipeline is considered to be abnormal and its thermal performance has deteriorated.
[0090] Example 2
[0091] This embodiment uses the main steam pipeline of a gas-steam combined cycle unit as the diagnostic object. The performance evaluation test condition (new condition) is used as the design condition, and a set of recent operating conditions is used as the current condition. The present invention is used for diagnosis, and the results are shown in Table 1. Table 1 shows that the pressure loss of the main steam pipeline is slightly greater than its target value, indicating that scaling and corrosion, valve leakage, or other factors may have caused changes in its hydraulic performance. The enthalpy drop of the main steam pipeline is much greater than its target value, which may be due to changes in its thermal performance caused by aging and damage to the pipeline insulation material.
[0092] Table 1
[0093]
[0094] Example 3
[0095] The high-temperature pipeline variable operating condition performance evaluation system of the present invention includes:
[0096] The acquisition module is used to acquire pipeline information under design conditions and pipeline information under current conditions.
[0097] The first calculation module is configured to calculate pressure loss and enthalpy drop of the pipeline under the design working condition and the current working condition according to pipeline information under the design working condition and pipeline information under the current working condition.
[0098] The second calculation module is configured to calculate average specific volume of the pipeline under the design working condition and the current working condition according to pipeline information under the design working condition and pipeline information under the current working condition.
[0099] The third calculation module is configured to calculate a pressure loss target value of the pipeline under the current working condition according to the pressure loss under the design working condition, mass flow and average specific volume of the pipeline under the design working condition and the current working condition.
[0100] The fourth calculation module is configured to calculate an enthalpy drop target value of the pipeline under the current working condition according to inlet and outlet temperatures, ambient temperature and mass flow of the pipeline under the design working condition and the current working condition.
[0101] The first comparison module is configured to compare the pressure loss of the pipeline under the current working condition with the pressure loss target value of the pipeline under the current working condition, and determine whether the hydraulic performance of the pipeline is deteriorated according to a comparison result.
[0102] The second comparison module is configured to compare the enthalpy drop of the pipeline under the current working condition with the enthalpy drop target value of the pipeline under the current working condition, and determine whether the thermal performance of the pipeline is deteriorated according to a comparison result.
[0103] The division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, another division mode can be used. In addition, the function modules in each embodiment of the present application can be integrated in one processor, or can be physically separated, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module.
[0104] Embodiment four
[0105] The computer device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the high-temperature pipeline variable working condition performance evaluation method when executing the computer program, for example, comprising: obtaining pipeline information under a design working condition and pipeline information under a current working condition; calculating pressure loss and enthalpy drop of the pipeline under the design working condition and the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition; calculating average specific volume of the pipeline under the design working condition and the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition; calculating a pressure loss target value of the pipeline under the current working condition according to the pressure loss under the design working condition, mass flow and average specific volume of the pipeline under the design working condition and the current working condition; calculating an enthalpy drop target value of the pipeline under the current working condition according to the inlet and outlet temperatures of the pipeline under the design working condition and the current working condition, the ambient temperature, and the mass flow; comparing the pressure loss of the pipeline under the current working condition with the pressure loss target value of the pipeline under the current working condition, and judging whether the hydraulic performance of the pipeline deteriorates according to the comparison result; comparing the enthalpy drop of the pipeline under the current working condition with the enthalpy drop target value of the pipeline under the current working condition, and judging whether the thermal performance of the pipeline deteriorates according to the comparison result. The memory can include a memory, for example, a high-speed random memory, and can also include a non-volatile memory, for example, at least one disk memory; the processor, the network interface, and the memory are connected to each other through an internal bus, which can be an industry standard architecture bus, a peripheral component interconnect standard bus, an extended industry standard structure bus, etc., and the bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs, specifically, the programs can include program codes, and the program codes include computer operation instructions. The memory can include a memory and a non-volatile memory, and provide instructions and data to the processor.
[0106] Embodiment five
[0107] A computer readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the high-temperature pipeline variable working condition performance evaluation method, for example, including: obtaining pipeline information under a design working condition and pipeline information under a current working condition; calculating pressure loss and enthalpy drop of the pipeline under the design working condition and under the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition; calculating average specific volume of the pipeline under the design working condition and under the current working condition according to the pipeline information under the design working condition and the pipeline information under the current working condition; calculating a pressure loss target value of the pipeline under the current working condition according to the pressure loss under the design working condition, mass flow rate of the pipeline under the design working condition and under the current working condition, and average specific volume of the pipeline under the design working condition and under the current working condition; calculating an enthalpy drop target value of the pipeline under the current working condition according to the inlet and outlet temperatures of the pipeline under the design working condition and under the current working condition, an ambient temperature, and mass flow rate; comparing the pressure loss of the pipeline under the current working condition with the pressure loss target value of the pipeline under the current working condition, and judging whether the hydraulic performance of the pipeline deteriorates according to a comparison result; and comparing the enthalpy drop of the pipeline under the current working condition with the enthalpy drop target value of the pipeline under the current working condition, and judging whether the thermal performance of the pipeline deteriorates according to a comparison result. Specifically, the computer readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory can include a random access memory (RAM) and / or a cache, etc. The non-volatile memory can include a read-only memory (ROM), a hard disk, a flash memory, an optical disc, a magnetic disc, etc.
[0108] Those skilled in the art will appreciate that embodiments of the application can be supplied as a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) having computer usable program code embodied thereon.
[0109] The application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, 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 apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus create a means for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in a flow or multiple flows and / or blocks Figure 1 The functions specified in a flow or multiple flows and / or blocks
[0110] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 one or more flow or block Figure 1 one or more blocks or steps of the flow.
[0111] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that are executed on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 one or more flow or block Figure 1 one or more blocks or steps of the flow.
[0112] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application be considered as including any variations, uses, or adaptations of this application following, in general, the principles of the application and including such steps and
[0113] It is to be understood that the application is not limited to the precise construction described and as shown in the attached drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present application. The scope of the application is limited only by the claims that follow.
[0114] The above description is only preferred embodiments of the present application, not any limitation thereto, any simple modification, change and equivalent structural change made according to the technical essence of the present application to the above embodiments shall still fall within the protection scope of the technical scheme of the present application.
Claims
1. A method for evaluating the performance of a high-temperature piping under off-design conditions, characterized by, The method comprises the following steps: obtaining pipeline information under a design condition and pipeline information under a current condition; calculating pressure loss and enthalpy drop of the pipeline under the design condition and the current condition according to the pipeline information under the design condition and the pipeline information under the current condition; calculating average specific volume of the pipeline under the design condition and the current condition according to the pipeline information under the design condition and the pipeline information under the current condition; calculating a target value of the pressure loss of the pipeline under the current condition according to the pressure loss under the design condition, mass flow rate and average specific volume of the pipeline under the design condition and the current condition; calculating a target value of the enthalpy drop of the pipeline under the current condition according to inlet and outlet temperatures, ambient temperature and mass flow rate of the pipeline under the design condition and the current condition, and the calculated enthalpy drop of the pipeline under the design condition; comparing the pressure loss of the pipeline under the current condition with the target value of the pressure loss of the pipeline under the current condition, and judging whether the hydraulic performance of the pipeline is deteriorated according to the comparison result; comparing the enthalpy drop of the pipeline under the current condition with the target value of the enthalpy drop of the pipeline under the current condition, and judging whether the thermal performance of the pipeline is deteriorated according to the comparison result.
2. The high-temperature piping variable operating condition performance evaluation method according to claim 1, characterized by, The pipeline information under the design working condition includes ambient temperature under the design working condition Inlet pressure of the pipeline Temperature And flow rate And outlet pressure of the pipeline Temperature And flow rate Pipe information at the current operating condition includes ambient temperature at the current operating condition Inlet pressure of the pipe Temperature And flow rate And outlet pressure of the pipe Temperature And flow rate 3. The high-temperature piping variable operating condition performance evaluation method according to claim 2, characterized by, The pressure loss of the pipeline under the design condition is: The enthalpy drop of the pipeline under the design condition is:
4. The high-temperature piping variable operating condition performance evaluation method according to claim 3, characterized by, The pressure loss of the pipeline under the current condition is: The enthalpy drop of the pipeline under the current condition is:
5. The high-temperature piping variable operating condition performance evaluation method according to claim 4, characterized by, The target value of the pressure loss of the pipeline under the current condition is: wherein, and are the average specific volumes of the inlet and outlet of the pipe under the current and design conditions, respectively: The target value of the enthalpy drop of the pipeline under the current condition is:
6. The high-temperature piping variable operating condition performance evaluation method according to claim 5, characterized by, The process of comparing the pressure loss of the pipeline under the current condition with the target value of the pressure loss of the pipeline under the current condition, and judging whether the hydraulic performance of the pipeline is deteriorated according to the comparison result is: calculating a deviation err of the pressure loss of the pipeline under the current working condition from a target value DP : When err DP If the value of err is less than 3%, it is considered that the flow resistance of the pipeline is normal, otherwise, it is considered that the flow resistance of the pipeline is abnormal, and the hydraulic performance of the pipeline deteriorates.
7. The high-temperature piping variable operating condition performance evaluation method according to claim 5, characterized by, The process of comparing the enthalpy drop of the pipeline under the current condition with the target value of the enthalpy drop of the pipeline under the current condition, and judging whether the thermal performance of the pipeline is deteriorated according to the comparison result is: calculating a deviation err of the enthalpy drop of the pipeline under the current working condition from an enthalpy drop target value DH : When err DH If the value is less than 3%, it is considered that the heat preservation material of the pipeline is normal, otherwise, it is considered that the heat preservation material of the pipeline is abnormal, and the heat performance of the pipeline deteriorates.
8. A high temperature piping off-design performance evaluation system characterized by, The method comprises the following steps: an obtaining module, configured to obtain pipeline information under a design condition and pipeline information under a current condition; a first calculating module, configured to calculate pressure loss and enthalpy drop of the pipeline under the design condition and the current condition according to the pipeline information under the design condition and the pipeline information under the current condition; a second calculating module, configured to calculate average specific volume of the pipeline under the design condition and the current condition according to the pipeline information under the design condition and the pipeline information under the current condition; a third calculating module, configured to calculate a target value of the pressure loss of the pipeline under the current condition according to the pressure loss under the design condition, mass flow rate and average specific volume of the pipeline under the design condition and the current condition; a fourth calculating module, configured to calculate a target value of the enthalpy drop of the pipeline under the current condition according to inlet and outlet temperatures, ambient temperature and mass flow rate of the pipeline under the design condition and the current condition, and the calculated enthalpy drop of the pipeline under the design condition; a first comparing module, configured to compare the pressure loss of the pipeline under the current condition with the target value of the pressure loss of the pipeline under the current condition, and judge whether the hydraulic performance of the pipeline is deteriorated according to the comparison result; a second comparing module, configured to compare the enthalpy drop of the pipeline under the current condition with the target value of the enthalpy drop of the pipeline under the current condition, and judge whether the thermal performance of the pipeline is deteriorated according to the comparison result.
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, The processor executes the computer program to realize the steps of the high-temperature pipeline variable-condition performance evaluation method in any one of claims 1-8.
10. A computer-readable storage medium storing a computer program, the computer-readable storage medium comprising: The computer program, when executed by a processor, implements the steps of the high-temperature pipeline variable operating condition performance evaluation method according to any one of claims 1-7.