CN114528704A - Reconstruction method and system of thermodynamic system - Google Patents
Reconstruction method and system of thermodynamic system Download PDFInfo
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Abstract
The invention discloses a reconstruction method and a reconstruction system of a thermodynamic system, which are based on a function and structure mapping fusion criterion. The reconstruction method of the thermodynamic system comprises the following steps: and step S1, obtaining a thermodynamic system scheme meeting the functional requirements of the user through a functional structure mapping method, wherein the thermodynamic system scheme comprises subsystems, equipment and environmental interface elements. Step S2, according to the thermodynamic system scheme, the subsystems are described according to the device composition, medium, pressure, temperature and material, and the devices are described according to the structural form, medium, pressure, temperature and material. And step S3, screening the subsystem combination capable of fusing the reconstruction alternatives according to the medium consistency and structure similarity fusion criterion. And step S4, evaluating the feasibility of the fusion reconstruction design for the alternative subsystem combination, and providing a fusion reconstruction design scheme. The reconstruction method of the thermodynamic system greatly reduces the dependence on the experience of designers, has better operability and can greatly shorten the design period.
Description
Technical Field
The present invention relates to the field of thermodynamic system design technologies, and in particular, to a method and a system for reconstructing a thermodynamic system.
Background
The thermodynamic system converts thermal energy generated by a boiler, a nuclear reactor, solar energy, etc. into mechanical energy, and further into electrical energy. In order to ensure the long-term operation of the thermodynamic system, besides designing corresponding equipment to realize thermodynamic cycle, an auxiliary support subsystem or equipment is also needed to realize the functions of working medium supplement, working medium and equipment cooling and the like. Taking a steam thermodynamic system as an example, main devices are a boiler, a steam turbine, a condenser and a feed pump, in order to enable the condenser to operate in a designed interval, a cooling water system needs to be designed for heat exchange, and an air extraction system is designed to enable the pressure of the condenser to be kept in a vacuum state, so that devices such as a circulating water pump and a vacuum pump need to be added. Thus, a practical thermodynamic system has a large number of devices and pipes. From the viewpoint of optimal design, the reduction of the number of equipment and pipelines is beneficial to simplifying the system so as to reduce the cost; for application objects such as ships, the reduction of equipment and piping is beneficial to saving valuable cabin space.
In the thermodynamic system design process, the design scheme meets the functional requirements and performance requirements of users through iteration. But the simplified design of the thermodynamic system lacks quantifiable indexes and mainly depends on the design experience of a designer to carry out repeated trial and error and check. The process lacks guidance of a theoretical method, so that a series of problems of more design repetition, long design period, large workload of designers and the like are caused.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a reconstruction method and a reconstruction system of a thermodynamic system, which not only greatly reduce the dependence on the experience of designers, but also have better operability and can greatly shorten the design period.
In order to achieve the above object, in a first aspect, the present invention provides a method for reconstructing a thermodynamic system, which is based on a fusion criterion of function and structure mapping. The reconstruction method of the thermodynamic system comprises the following steps: and step S1, obtaining a thermodynamic system scheme meeting the functional requirements of the user through a functional structure mapping method, wherein the thermodynamic system scheme comprises subsystems, equipment and environment interface elements. Step S2, describing the subsystems according to device composition, medium, pressure, temperature and material, and describing the devices according to structural form, medium, pressure, temperature and material, according to the thermodynamic system scheme. And step S3, screening alternative subsystem combinations capable of fusing and reconstructing according to the medium consistency and structural similarity fusion criteria. And step S4, evaluating the feasibility of the fusion reconstruction design for the alternative subsystem combination, and providing a fusion reconstruction design scheme. The subsystems of step S1 are divided according to the capability of implementing complete independent functions.
In an embodiment of the present invention, the step S2 further includes creating a system design database, and the system design database includes: a subsystem design database, an equipment design database, and a media database. The subsystem design database is used for storing equipment composition, medium, pressure, temperature and material information of the subsystem. The device design database is used for storing the structural form, medium, pressure, temperature and material information of the device. And a media database for storing names, primary properties, and matching materials of media associated with the thermodynamic system.
In an embodiment of the present invention, step S3 specifically includes: step S301, judging whether the media of the two subsystems are the same. Step S302, calculating the temperature interval eta of the two subsystem mediatAnd pressure interval ηpThe proximity of (a). Step S303, calculating the similarity degree eta of the composition structure of the two subsystemss. And step S304, calculating the fusion reconstruction index eta of the two subsystems. And if the media of the two subsystems are different, fusion reconstruction cannot be carried out. If the media of the two subsystems are the same, the process proceeds to step S302. Wherein,η for medium identitymMarking is carried out with the same medium etamWhen the media are different eta 1m＝0。
In one embodiment of the invention, the temperature interval η of the two subsystem media is calculatedtAnd pressure interval ηpThe approach of (2) is as follows: temperature interval η of the first subsystemtAnd pressure interval ηpAre each [ t11,t12]And [ p ]11,p12]Temperature interval η of the second subsystem 2tAnd pressure interval etapAre each [ t21,t22]And [ p ]21,p22]Then temperature interval ηtThe closeness of (c) is:
wherein eta istWhen the temperature interval is less than or equal to 0, the temperature interval is not close to the temperature interval, and the fusion reconstruction possibility of the two subsystems is low;
wherein eta istWhen the temperature is equal to 1, the temperature interval is completely close, and the fusion reconstruction possibility of the two subsystems is high;
wherein, 0<ηt<1, the two subsystems have certain fusion reconstruction possibility.
The proximity of the pressure intervals is:
wherein etapWhen the temperature is less than or equal to 0, the temperature interval is not close to the temperature interval, and the fusion reconstruction possibility of the two subsystems is low;
wherein eta ispWhen the temperature is equal to 1, the temperature interval is completely close, and the fusion reconstruction possibility of the two subsystems is high;
wherein, 0<ηp<1, the two subsystems have certain fusion reconstruction possibility.
In one embodiment of the invention, the two subsystems are each driven by a steam turbineThe system comprises a pump, a valve, a heat exchanger and a pipeline, the structure of the subsystems is described in sequence according to the connection sequence, and the similarity degree eta of the structure of the two subsystems is calculated by an edit distance methodsThe specific calculation method comprises the following steps:
wherein s is1Is the sequence of the first subsystem, s2Sequence of the second subsystem,/1And l2Respectively, the sequence length, D(s)1,s2) Is a sequence s1And s2I.e. the sequence s can be inserted, deleted and replaced at least D times1Into a sequence s2。
In an embodiment of the present invention, the method for calculating the fusion reconstruction index η of the two subsystems comprises:
wherein the integratable design degrees of two subsystems with the same medium are sorted according to the index, and a threshold eta can be set0When eta is greater than or equal to eta0Then, these two subsystems become the alternative subsystems adopting the fusion reconstruction design, and the process proceeds to step S4.
In an embodiment of the present invention, step S4 specifically includes: step S401, calculating the degree of identity eta of the media of the two devicesm. Step S402, calculating the temperature interval eta of the medium in the two devicestAnd pressure interval ηpThe proximity of (a). Step S403, calculating the similarity degree eta of the two devices in structures. And step S404, calculating a fusion reconstruction index eta of the two devices. The calculation method of step S402 is the same as that of step S302. The calculation method of step S403 is the same as that of step S303. The calculation method of step S404 is the same as that of step S304, and a threshold η is set0When eta is greater than or equal to eta0And if not, the two devices cannot be subjected to fusion reconstruction. And continuing to execute the steps S401 to S404, and completing the fusion reconstruction scheme of all the equipment combinations, thereby completing the fusion reconstruction scheme of the subsystem.
In an embodiment of the present invention, the calculation method in step S401 is: for single medium devices, the media are the same to the same degree ηmValue 1, the same degree eta when differentmThe value is 0. For equipment with heat exchangers containing different media, the same degree eta is obtained when the cold side and the hot side are the same mediummA value of 1, the same degree eta with one side being the samemA value of 0.5, all of the same degree etamThe value is 0.
In a second aspect, the present invention provides a reconfiguration system for a thermodynamic system based on a functional and structural mapping fusion criterion. The reconfiguration system of thermodynamic system includes: the device comprises a preprocessing module, a screening module, a fusion reconstruction design module and an evaluation module. The preprocessing module is used for describing the design scheme of the thermodynamic system and comprises subsystem, equipment and interface element information. The screening module is used for screening the potential subsystem and equipment fusion reconstruction design object so as to obtain an alternative subsystem. And the fusion reconstruction design module is used for describing a feasible fusion reconstruction design scheme of the alternative subsystem. And the evaluation module is used for comparing and evaluating advantages and disadvantages of different design schemes and providing a better fusion reconstruction design scheme.
In an embodiment of the present invention, the preprocessing module further includes creating a system design database, and the system design database stores subsystem design schemes, device design schemes, and working medium information.
Compared with the prior art, according to the reconstruction method and the reconstruction system of the thermodynamic system, the thermodynamic system is integrated and simplified by the provided fusion criterion and the programming design process, so that the dependence on the experience of designers is greatly reduced, the operability is better, and the design period can be greatly shortened.
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FIG. 1 is a schematic flow diagram of a method of reconfiguring a thermodynamic system in accordance with an embodiment of the invention;
FIG. 2 is a schematic flow diagram illustrating a combined screening of fused reconstruction candidate subsystems of a reconstruction method of a thermodynamic system according to an embodiment of the invention;
FIG. 3 is a flow chart of a device combination for performing a fused reconstruction design according to a reconstruction method of a thermodynamic system in an embodiment of the invention;
fig. 4 is a schematic diagram of a subsystem fusion reconstruction of a reconstruction method of a thermodynamic system according to an embodiment of the present invention.
Description of the main reference numbers:
1-a first water pump, 2-a vacuum pump, 3-a second water pump, 4-a frequency converter and 5-a third water pump.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 is a schematic flow diagram of a method of reconfiguring a thermodynamic system in accordance with an embodiment of the invention. Fig. 2 is a schematic flow chart of a fusion reconstruction alternative subsystem combination screening of a reconstruction method of a thermodynamic system according to an embodiment of the present invention. Fig. 3 is a flow chart of a device combination for performing fusion reconstruction design of a reconstruction method of a thermodynamic system according to an embodiment of the present invention. Fig. 4 is a schematic diagram of subsystem fusion reconstruction of a reconstruction method of a thermodynamic system according to an embodiment of the present invention.
As shown in fig. 1, in a first aspect, a reconstruction method for a thermodynamic system according to a preferred embodiment of the present invention is based on a functional and structural mapping fusion criterion. The reconstruction method of the thermodynamic system comprises the following steps: and step S1, obtaining a thermodynamic system scheme meeting the functional requirements of the user through a functional structure mapping method, wherein the thermodynamic system scheme comprises subsystems, equipment and environment interface elements. Step S2, describing the subsystems according to device composition, medium, pressure, temperature and material, and describing the devices according to structural form, medium, pressure, temperature and material, according to the thermodynamic system scheme. And step S3, screening alternative subsystem combinations capable of fusing and reconstructing according to the medium consistency and structural similarity fusion criteria. And step S4, evaluating the feasibility of the fusion reconstruction design for the alternative subsystem combination, and providing a fusion reconstruction design scheme. The subsystems of step S1 are divided according to the capability of implementing complete independent functions.
In an embodiment of the present invention, step S2 further includes creating a system design database, and the system design database includes: a subsystem design database, an equipment design database, and a media database. The subsystem design database is used for storing equipment composition, medium, pressure, temperature and material information of the subsystem. The device design database is used for storing the structural form, medium, pressure, temperature and material information of the device. And a media database for storing names, primary properties, and matching materials of media associated with the thermodynamic system.
In an embodiment of the present invention, as shown in fig. 2, step S3 specifically includes:
step S301, determining whether the media of the two subsystems are the same.
Step S302, calculating the temperature interval eta of the two subsystem mediatAnd pressure interval ηpThe proximity of (a).
Step S303, calculating the similarity degree eta of the composition structure of the two subsystemss。
And step S304, calculating a fusion reconstruction index eta of the two subsystems.
And if the media of the two subsystems are different, fusion reconstruction cannot be carried out. If the media of the two subsystems are the same, the process proceeds to step S302. Wherein the media are of the same degree using etamMarking is carried out with the same medium etamWhen the media are different eta 1m＝0。
In one embodiment of the invention, the temperature interval η of the two subsystem media is calculatedtAnd pressure interval ηpThe approach of (2) is as follows: temperature interval η of the first subsystemtAnd pressure interval ηpAre each [ t11,t12]And [ p ]11,p12]Temperature interval η of the second subsystem 2tAnd pressure interval ηpAre each [ t21,t22]And [ p ]21,p22]Then temperature interval ηtThe closeness of (c) is:
wherein eta istWhen the temperature interval is less than or equal to 0, the temperature interval is not close to the temperature interval, and the fusion reconstruction possibility of the two subsystems is low;
wherein eta istWhen the temperature is equal to 1, the temperature interval is completely close, and the fusion reconstruction possibility of the two subsystems is high;
wherein, 0<ηt<1, the two subsystems have certain fusion reconstruction possibility.
The proximity of the pressure intervals is:
wherein eta ispWhen the temperature is less than or equal to 0, the temperature interval is not close to the temperature interval, and the fusion reconstruction possibility of the two subsystems is low;
wherein eta ispWhen the temperature is equal to 1, the temperature interval is completely close, and the fusion reconstruction possibility of the two subsystems is high;
wherein 0<ηp<1, the two subsystems have certain fusion reconstruction possibility.
In one embodiment of the invention, the two subsystems are respectively composed of a steam turbine, a pump, a valve, a heat exchanger and a pipeline, the subsystem structure is described in sequence according to the connection sequence, and the two subsystem groups are calculated by an edit distance methodDegree of structural similarity ηsThe specific calculation method comprises the following steps:
wherein s is1Is the sequence of the first subsystem, s2Sequence of the second subsystem,/1And l2Respectively, the sequence length, D(s)1，s2) Is a sequence s1And s2I.e. the sequence s can be inserted, deleted and replaced at least D times1Into a sequence s2。
In an embodiment of the present invention, the method for calculating the fusion reconstruction index η of the two subsystems comprises:
wherein the integratable design degrees of two subsystems with the same medium are sorted according to the index, and a threshold eta can be set0When eta is more than or equal to eta0Then, these two subsystems become the alternative subsystems adopting the fusion reconstruction design, and the process proceeds to step S4.
In an embodiment of the present invention, as shown in fig. 3, step S4 specifically includes:
step S401, calculating the degree of identity eta of the media of the two devicesm。
Step S402, calculating the temperature interval eta of the medium in the two devicestAnd pressure interval ηpThe proximity of (a).
Step S403, calculating the similarity degree eta of the two devices in structures。
And step S404, calculating a fusion reconstruction index eta of the two devices.
The calculation method of step S402 is the same as that of step S302. The calculation method in step S403 is the same as that in step S303. The calculation method of step S404 is the same as that of step S304, and a threshold η is set0When eta is not less thanη0And if not, the two devices cannot be subjected to fusion reconstruction. And continuing to execute the steps S401 to S404, and completing the fusion reconstruction scheme of all the equipment combinations, thereby completing the fusion reconstruction scheme of the subsystem.
In an embodiment of the present invention, the calculation method in step S401 is: for single medium devices, the media are the same to the same degree ηmValue 1, the same degree eta when differentmThe value is 0. For equipment with heat exchangers containing different media, the same degree eta is obtained when the cold side and the hot side are the same mediummA value of 1, the same degree eta with one side being the samemA value of 0.5, all of the same degree etamThe value is 0.
In a second aspect, a reconstruction system for a thermodynamic system in accordance with a preferred embodiment of the present invention is based on a functional and structural map fusion criterion. A reconfiguration system for a thermodynamic system comprising: the device comprises a preprocessing module, a screening module, a fusion reconstruction design module and an evaluation module. The preprocessing module is used for describing the design scheme of the thermodynamic system and comprises subsystem, equipment and interface element information. The screening module is used for screening potential subsystem and equipment fusion reconstruction design objects so as to obtain alternative subsystems. And the fusion reconstruction design module is used for describing a feasible fusion reconstruction design scheme of the alternative subsystem. And the evaluation module is used for comparing and evaluating advantages and disadvantages of different design schemes and providing a better fusion reconstruction design scheme.
In an embodiment of the present invention, the preprocessing module further includes creating a system design database, and the system design database stores subsystem design schemes, device design schemes, and working medium information.
In one embodiment of the present invention, a system design database includes: a subsystem design database, an equipment design database, and a media database. The subsystem design database stores information such as device composition, media, pressure, temperature, and materials of the subsystem. The device design database stores information about the structural form, media, pressure, temperature, and materials of the device. The media database stores the names, primary properties, and matching materials of the media associated with the thermodynamic system.
In one embodiment of the present invention, the screening module includes a medium consistency calculation unit, a medium temperature and pressure interval proximity calculation unit, a structural similarity calculation unit, a sorting unit, and a determination unit. The medium consistency calculation unit is used for calculating the same degree of the mediums of the two subsystems or the two devices. The medium temperature and pressure interval proximity degree calculation unit is used for calculating the proximity degree of the temperature interval and the pressure interval of the medium of the two subsystems or equipment. The result similarity calculation unit is used for calculating the structural similarity degree of the two subsystems or equipment. And the sequencing unit sequences the alternative subsystems in pairwise combination according to the total fusion reconstruction index so as to further design a fusion reconstruction scheme. The judging unit is used for judging whether the current design scheme meets the termination condition of the fusion reconstruction design, and when the fusion reconstruction indexes of the pairwise combination of all the subsystems are smaller than a set threshold value, the current design scheme is a final scheme; otherwise, starting the next round of fusion reconstruction design.
In an embodiment of the present invention, the reconfiguration system of the thermodynamic system further includes a design solution management module, and the design solution management module is configured to store different iteration solutions for gradually performing the fused reconfiguration design from the initial solution, so as to clearly show the iterative process of the thermodynamic system solution design.
In practical application, the technical problem to be solved by the reconstruction method and the reconstruction system of the thermodynamic system is to overcome the defects of more design repetition, long design period, large workload of designers and the like existing in the simplified design of the thermodynamic system depending on the experience of the designers. Specifically, a reconstruction method of a thermodynamic system is provided, which comprises the following steps:
step S1, obtaining a thermodynamic system scheme meeting the functional requirements of users by a functional structure mapping method, wherein the scheme comprises a subsystem, equipment, an environmental interface element and the like;
step S2, according to the scheme of the thermodynamic system, describing the subsystems according to the equipment composition, medium, pressure, temperature, materials and the like, and describing the equipment according to the structural form, the medium, the pressure, the temperature, the materials and the like;
step S3, screening subsystem combinations capable of being fused and reconstructed according to fusion criteria such as medium consistency, structural similarity and the like;
and step S4, evaluating the feasibility of the fusion reconstruction design for the alternative subsystem combination, and proposing a fusion reconstruction design scheme.
The subsystems of step S1 are divided according to the function of realizing complete independence.
Step S2 further includes creating a system design database, where the system design database includes a subsystem design database, an apparatus design database, and a medium database, the subsystem design database stores information such as apparatus composition, medium, pressure, temperature, and material of the subsystem, the apparatus design database stores information such as structural form, medium, pressure, temperature, and material of the apparatus, and the medium database stores names, main properties, and matching materials of the media related to the thermal system.
In a steam thermodynamic system, the media types are mainly steam (live steam and dead steam), hydrophobic, fresh water, gas-containing fresh water, salt-containing fresh water, fresh water containing other impurities, steam-air mixture, air, seawater (or river water), lubricating oil, gas-containing lubricating oil, lubricating oil containing other impurities, and the like.
Referring to fig. 2, the specific steps of screening the potentially fusible reconfiguration sub-system combinations in step S3 include:
step S301, judging whether the media of the two subsystems are the same.
And step S302, calculating the closeness of the temperature interval and the pressure interval of the two subsystem media.
Step S303, calculating the structural similarity between the two subsystems.
And step S304, calculating the fusion reconstruction index of the two subsystems, and taking the subsystem as an alternative subsystem combination when the fusion reconstruction index is larger than a set threshold value.
Performing fusion reconstruction design on the corresponding equipment of the alternative subsystem combination in the step S3, wherein the step S4 specifically includes
In step S401, the degree of identity of the media of the two devices is calculated.
Step S402, calculating the closeness of the temperature interval and the pressure interval of the medium in the two devices.
In step S403, the similarity degree of the two devices in structure is calculated.
And S404, calculating the fusion reconstruction indexes of the two devices, wherein the fusion reconstruction indexes have fusion reconstruction possibility when the fusion reconstruction indexes are larger than a set threshold value, and giving a fusion reconstruction scheme.
Fig. 4 shows a case schematic of the design by using the method for designing the thermodynamic system fusion reconstruction based on the fusion criterion provided by the invention. According to the functional structure mapping method of step S1 in fig. 1, the vacuum pump cooling subsystem is configured to cool the vacuum pump to ensure normal operation of the vacuum pump, and the frequency converter cooling subsystem is configured to cool the frequency converter of the frequency conversion pump to ensure normal operation of the frequency converter. The vacuum pump cooling subsystem comprises a river water intake, a first water pump 1, a vacuum pump 2 and a river water outlet, and the frequency converter cooling subsystem comprises a river water intake, a second water pump 3, a frequency converter 4 and a river water outlet.
According to step S2 in fig. 1, the equipment of the vacuum pump cooling subsystem is composed of [ river water, water pump, vacuum pump, river water ], medium is river water, temperature interval [10 ℃,18 ℃), pressure interval [0.2MPa,0.25MPa ], and pipeline material is 304 stainless steel; the equipment composition sequence of the frequency converter cooling subsystem is [ river water, water pump, frequency converter, river water ], the medium is river water, the temperature interval [10 ℃,20 ℃) and the pressure interval [0.2MPa,0.28MPa ], and the pipeline material is 304 stainless steel.
According to step S301 in fig. 2, the medium of the vacuum pump cooling subsystem and the frequency converter cooling subsystem is river water, and the process proceeds to step S302.
According to step S302 in fig. 2, the temperature interval proximity of the vacuum pump cooling subsystem and the inverter cooling subsystem is 0.8, and the pressure interval proximity is 0.625.
According to step S303 in fig. 2, the edit distance of the sequence of the vacuum pump cooling subsystem and the inverter cooling subsystem is 1, that is, the "vacuum pump" is replaced by the "inverter", and the structural similarity between the two subsystems is 1-1/4, which is 0.75.
According to step S304 in fig. 2, the fusion reconstruction index of the two subsystems is 0.53. And if the fusion reconstruction index threshold value is 0.2, the vacuum pump cooling subsystem and the frequency converter cooling subsystem are the alternative subsystem combination.
In order to perform fusion reconstruction on the two subsystems, the fusion reconstruction design of the device level is considered according to the steps S401 to S404. The river water intake and the water outlet can be directly combined. The first water pump 1 and the second water pump 3 have the same medium, temperature and structure, only the outlet pressure is different, the fusion reconstruction index can be calculated to be 0.81, and the fusion reconstruction index is further calculated to be the third water pump 5. The vacuum pump 2 and the frequency converter 4 have a structural similarity of 0, and thus do not have the possibility of fusion reconstruction.
Through the operation steps, the vacuum pump cooling subsystem and the frequency converter cooling subsystem can be designed into a fusion reconstruction cooling subsystem, the subsystem is connected with a river serving as a hot well through a main pipe, river water is extracted through the third water pump 5 to be cooling water, then the vacuum pump and the frequency converter are respectively cooled through branch pipes, the river water after heat absorption is converged firstly, and then the river water is discharged into the river through the main pipe. By the fusion reconstruction design method provided by the invention, the number of subsystems and equipment of the thermodynamic system is reduced, and the simplification of the system design is realized.
In summary, the method and system for reconstructing a thermodynamic system of the present invention integrates and simplifies the design of the thermodynamic system through the proposed convergence criterion and the programming design process, thereby greatly reducing the dependence on the experience of the designer, having better operability, and greatly shortening the design cycle.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may 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 instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may 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 which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. A reconstruction method of a thermodynamic system is based on a fusion criterion of function and structure mapping, and is characterized by comprising the following steps:
step S1, obtaining a thermodynamic system scheme meeting the functional requirements of users by a functional structure mapping method, wherein the thermodynamic system scheme comprises subsystems, equipment and environment interface elements;
step S2, according to the scheme of the thermodynamic system, describing the subsystems according to equipment composition, media, pressure, temperature and materials, and describing the equipment according to structural form, media, pressure, temperature and materials;
step S3, screening alternative subsystem combinations capable of being fused and reconstructed according to the medium consistency and structural similarity fusion criterion;
step S4, evaluating the feasibility of the fusion reconstruction design for the alternative subsystem combination, and proposing a fusion reconstruction design scheme;
wherein, the subsystems of the step S1 are divided according to the capability of realizing complete independent functions.
2. The method for reconstructing a thermodynamic system as claimed in claim 1, wherein the step S2 further comprises creating a system design database, and the system design database comprises:
the subsystem design database is used for storing equipment composition, medium, pressure, temperature and material information of the subsystem;
the equipment design database is used for storing the structural form, medium, pressure, temperature and material information of the equipment; and
a media database for storing names, main properties and matching materials of media related to the thermodynamic system.
3. The method for reconstructing a thermodynamic system as claimed in claim 1, wherein the step S3 specifically includes:
step S301, judging whether the media of the two subsystems are the same;
step S302, calculating the temperature interval eta of the two subsystem mediatAnd pressure interval ηpThe proximity of (a);
step S303, calculating the similarity degree eta of the composition structure of the two subsystemss(ii) a And
step S304, calculating a fusion reconstruction index eta of the two subsystems;
if the media of the two subsystems are different, fusion reconstruction cannot be performed;
if the media of the two subsystems are the same, the step S302 is carried out;
wherein the media are of the same degree using etamMarking is carried out with the same medium etamWhen the media are different eta 1m＝0。
4. A method for reconstructing a thermodynamic system according to claim 3, wherein the temperature interval η between the two subsystem media is calculatedtAnd pressure interval ηpThe approach of (2) is as follows:
temperature interval η of the first subsystemtAnd pressure interval ηpAre each [ t11,t12]And [ p ]11,p12]Temperature interval η of the second subsystem 2tAnd pressure interval ηpAre each [ t21,t22]And [ p ]21,p22]Then temperature interval ηtThe closeness of (c) is:
wherein eta istWhen the temperature interval is less than or equal to 0, the temperature interval is not close to the temperature interval, and the fusion reconstruction possibility of the two subsystems is low;
wherein eta istWhen the temperature is equal to 1, the temperature interval is completely close, and the fusion reconstruction possibility of the two subsystems is high;
wherein, 0<ηt<1, the two subsystems have certain fusion reconstruction possibility.
The closeness of the pressure intervals is:
wherein eta ispWhen the temperature is less than or equal to 0, the temperature interval is not close to each other completely, and the fusion reconstruction possibility of the two subsystems is low;
wherein eta ispWhen the temperature is equal to 1, the temperature interval is completely close, and the fusion reconstruction possibility of the two subsystems is high;
wherein, 0<ηp<1, the two subsystems have certain fusion reconstruction possibility.
5. A reconstruction method of thermodynamic system as claimed in claim 4, wherein the two subsystems are composed of a steam engine, a pump, a valve, a heat exchanger and a pipeline, respectively, the subsystem structures are described in sequence according to the connection order, and the similarity degree η on the component structures of the two subsystems is calculated by the edit distance methodsThe specific calculation method comprises the following steps:
wherein s is1Is the sequence of the first subsystem, s2Sequence of the second subsystem,/1And l2Respectively, the sequence length, D(s)1,s2) Is a sequence s1And s2I.e. the sequence s can be inserted, deleted and replaced at least D times1Into a sequence s2。
6. A method of reconstructing a thermodynamic system as claimed in claim 5, wherein the method of calculating the fusion reconstruction index η for the two subsystems is:
wherein the integratable design degrees of two subsystems with the same medium are sorted according to the index, and a threshold eta can be set0When eta is greater than or equal to eta0Then, these two subsystems become the alternative subsystems adopting the fusion reconstruction design, and the process proceeds to step S4.
7. The method for reconstructing a thermodynamic system as claimed in claim 6, wherein the step S4 specifically includes:
step S401, calculating the degree of identity eta of the media of the two devicesm；
Step S402, calculating the temperature interval eta of the medium in the two devicestAnd pressure interval ηpThe proximity of (a);
step S403, calculating the similarity degree eta of the two devices in structures；
Step S404, calculating a fusion reconstruction index eta of the two devices;
wherein, the calculation method of the step S402 is the same as that of the step S302;
wherein, the calculation method of the step S403 is the same as that of the step S303;
wherein the calculation method of the step S404 is the same as that of the step S304, and a threshold eta is set0When eta is greater than or equal to eta0When the two devices have the possibility of fusion reconstruction, a fusion reconstruction scheme is given, otherwise, the two devices cannot perform fusion reconstruction;
and continuing to execute the steps S401 to S404, and completing the fusion reconstruction scheme of all the equipment combinations, thereby completing the fusion reconstruction scheme of the subsystem.
8. The method for reconstructing a thermodynamic system according to claim 7, wherein the calculation method of step S401 is:
for single medium devices, the media are the same to the same degree ηmValue of 1, not identicalDegree etamA value of 0;
for equipment with heat exchangers containing different media, the same degree eta is obtained when the cold side and the hot side are the same mediummA value of 1, the same degree eta with one side being the samemA value of 0.5, all of the same degree etamThe value is 0.
9. A reconfiguration system for a thermodynamic system based on a functional and structural mapping convergence criterion, the reconfiguration system comprising:
the system comprises a preprocessing module, a data processing module and a data processing module, wherein the preprocessing module is used for describing a design scheme of a thermodynamic system and comprises subsystems, equipment and interface element information;
the screening module is used for screening the potential subsystem and equipment fusion reconstruction design object so as to obtain an alternative subsystem;
the fusion reconstruction design module is used for describing a feasible fusion reconstruction design scheme of the alternative subsystem; and
and the evaluation module is used for comparing and evaluating advantages and disadvantages of different design schemes and providing a better fusion reconstruction design scheme.
10. The method of claim 9, wherein the preprocessing module further comprises creating a system design database, and the system design database stores subsystem design solutions, equipment design solutions and working medium information.
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