CN110414081B - Thermal power plant pipeline stress coupling analysis system and analysis method - Google Patents
Thermal power plant pipeline stress coupling analysis system and analysis method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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Abstract
The invention relates to a thermal power plant pipeline stress coupling analysis system and an analysis method. The front end boom force sensor is arranged on the front end fixed hanging frame, the rear end boom force sensor is arranged on the rear end fixed hanging frame, the left side force sensor of the spring hanging frame and the right side force sensor of the spring hanging frame are respectively arranged on two sides of the spring hanging frame, the front end pipeline wall temperature sensor, the front end pipeline pressure sensor, the flow sensor, the rear end pipeline wall temperature sensor and the rear end pipeline pressure sensor are all arranged on the pipeline, and the front end pipeline wall temperature sensor, the front end boom force sensor, the front end pipeline pressure sensor, the flow sensor, the rear end pipeline wall temperature sensor, the rear end pipeline pressure sensor, the rear end boom force sensor and the right side force sensor of the spring hanging frame are all connected with a computer. The thermal power plant pipeline stress coupling analysis system and the analysis method have the advantages of high technical content, strong innovation, high safety value, practical compliance and good operability.
Description
Technical Field
The invention relates to a thermal power plant pipeline stress coupling analysis system and an analysis method.
Background
At present, more software is used for calculating pipeline stress in the market, and the technology is mature. The stress analysis software builds a model in advance, and then calculates the stress under various loads to obtain the stress under various working conditions. ANSYS software is large-scale general-purpose Finite Element Analysis (FEA) software developed by ANSYS corporation, usa, and can perform structural static analysis, structural dynamic analysis, structural nonlinear analysis, dynamic analysis, thermal analysis. The CAESARII pipeline stress analysis software is pressure pipeline stress analysis professional software developed by COADE company in the United states, and can analyze and calculate static analysis and also can dynamically analyze. Bentley autoppe is a set of pipeline analysis software with a full Windows interface, and is mainly used for calculating the legal stress (Code Stresses), loading force and deflection (reflections) of a pipeline system when the pipeline system is subjected to Static (Static) and Dynamic (Dynamic) loads. The excellent pipeline stress calculation software is excellent domestic pipeline stress calculation software, english is called AutoPSA for short, and finite element emission analysis is adopted to analyze pipeline system stress. The software is subjected to off-line simulation analysis, and the change condition of the pipe system stress cannot be analyzed in real time, and can only be used as a design instruction and cannot be used as an operation instruction, so that most of users of the software are design houses or scientific research institutions at present, and the software is not applied to pipeline operation units. In this context, it is significant to develop a new type of on-line pipeline stress coupling analysis system.
With the continuous discharge of various policies of safe production and intelligent technology development, the safety of pipeline systems in the industrial industries such as chemical industry, electric power and the like is more and more emphasized, the running digitization and intelligent requirements of the pipeline systems are more and more urgent, a coupling analysis system for stress of each part of the pipeline systems is established, and the online stress analysis is realized, so that the method has social value.
The existing industrial pipeline system has the following problems:
(1) Stress state deviation. Because of the deviation of the conditions such as materials, construction, operation environment and the like and the design, the actual stress condition of the pipe system has larger difference from the design, and the normal or abnormal state of the pipe system is judged according to the design condition, so that the risk is larger. At present, the problems of main steam pipeline weld cracking, pipeline sinking, pipe clamp deformation, support and hanger overload or void and the like in many power plants are all related to serious deviation of the pipe system stress condition from the design working condition.
(2) The stress state is not known. At present, for the running pipe system, equipment with no on-line monitoring of the stress state can only find problems through regular overhauling, then perform simulation calculation and timely adjust or replace a failed component. Or, during service, some mechanical detection devices are utilized to sample stress conditions of a part of the piping or critical non-part. Short-term measures are equivalent to static measures, and the change of stress is not tracked in the long-term operation of the system, so that the problems are not found.
(3) No coupling relationship between the parameters is established. According to the mechanics principle, the load and displacement of each suspension point are calculated according to the actual load, and are all theoretically carried out according to a formula. The formula has a theoretical formula and an empirical formula, and meanwhile, the calculation amount is increased by utilizing a finite element analysis method, and a large number of boundary conditions are required to be artificially input, so that the calculation of the capacity can be realized. All the input parameters have a certain corresponding relation, and once the coupling formula is found, the on-line stress calculation can be performed. However, no one establishes the coupling relation for on-line stress analysis, and the stress relation between the nodes cannot be analyzed at any time.
Therefore, the research significance of the thermal power plant pipeline stress coupling analysis system is great and necessary.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a thermal power plant pipeline stress coupling analysis system and a thermal power plant pipeline stress coupling analysis method which are reasonable in structural design, can solve the problem of how to calculate the pipeline stress quickly, and can perform stress analysis and risk early warning on line according to the change of the pipeline operation parameters.
The invention solves the problems by adopting the following technical scheme: the thermal power plant pipeline stress coupling analysis system is characterized in that: the device comprises a pipeline, a front pipeline wall temperature sensor, a front fixed hanging bracket, a front hanging rod force sensor, a front pipeline pressure sensor, a spring hanging bracket, a flow sensor, a rear fixed hanging bracket, a rear pipeline wall temperature sensor, a rear pipeline pressure sensor, a rear hanging rod force sensor, a spring hanging bracket left side force sensor, a computer and a spring hanging bracket right side force sensor; the front end boom force sensor is installed on the front end fixed gallows, the rear end boom force sensor is installed on the rear end fixed gallows, spring gallows left side force sensor and spring gallows right side force sensor are installed in the both sides of spring gallows respectively, front end pipeline wall temperature sensor, front end pipeline pressure sensor, flow sensor, rear end pipeline wall temperature sensor and rear end pipeline pressure sensor all install on the pipeline, front end pipeline wall temperature sensor, front end boom force sensor, front end pipeline pressure sensor, flow sensor, rear end pipeline wall temperature sensor, rear end pipeline pressure sensor, rear end boom force sensor and spring gallows right side force sensor all are connected with the computer.
Further, the front end fixed hanging bracket, the rear end fixed hanging bracket and the spring hanging bracket are all connected with the pipeline.
Further, the front end pipeline wall temperature sensor and the rear end pipeline wall temperature sensor are both installed on the outer side metal wall of the pipeline.
Further, the device also comprises a fixed hanging bracket upper hanging rod and a fixed hanging bracket lower hanging rod; one end of the fixed hanging frame lower hanging rod is connected with a pipeline, the other end of the fixed hanging frame lower hanging rod is connected with a front hanging rod force sensor, the front hanging rod force sensor is connected with one end of the fixed hanging frame upper hanging rod, and the other end of the fixed hanging frame upper hanging rod is connected with a structure fixed steel frame.
Further, the device also comprises a fixed hanging bracket upper hanging rod and a fixed hanging bracket lower hanging rod; one end of the hanging rod under the fixed hanging frame is connected with a pipeline, the other end of the hanging rod under the fixed hanging frame is connected with a rear hanging rod force sensor, the rear hanging rod force sensor is connected with one end of the hanging rod on the fixed hanging frame, and the other end of the hanging rod on the fixed hanging frame is connected with a structure fixed steel frame.
Further, the device also comprises a left pull rod of the spring hanger, a right pull rod of the spring hanger, a left pressing plate, a right pressing plate, a left locking nut and a right locking nut; one end of the left pull rod of the spring hanger and one end of the right pull rod of the spring hanger are connected with the pipeline, the other ends of the left pull rod of the spring hanger and the right pull rod of the spring hanger are all penetrated with the structure fixing steel frame, the left force sensor of the spring hanger is arranged on the left pull rod of the spring hanger through a left pressing plate and a left locking nut, the left pressing plate and the left locking nut are all arranged above the structure fixing steel frame, and the right force sensor of the spring hanger is arranged on the right pull rod of the spring hanger through a right pressing plate and a right locking nut, and the right pressing plate and the right locking nut are all arranged above the structure fixing steel frame.
Further, another technical object of the present invention is to provide an analysis method of a thermal power plant pipeline stress coupling analysis system.
The technical purpose of the invention is achieved by the following technical scheme.
An analysis method of a thermal power plant pipeline stress coupling analysis system is characterized by comprising the following steps: the analysis method is as follows: step one: performing field investigation, collecting data such as a pipeline, a support hanger and a heat preservation layer, and calculating the loads of the front end fixed hanger, the spring hanger and the rear end fixed hanger under working conditions offline by utilizing the existing material mechanics formula according to the weight of the pipeline, the temperature, the pressure and the flow of a working medium;
step two: analyzing and sorting load data of the front end fixed hanging frame, the spring hanging frame and the rear end fixed hanging frame under different working conditions, and analyzing;
step three: firstly, the calculation results of the front-end fixed hanging frame are arranged as follows:
when other parameters are unchanged and the flow of the medium is changed, the stress condition of the front end fixing hanging bracket is as shown in table 1:
TABLE 1 stress parameter table during flow rate variation
| Flow Q (t/h) | Temperature T (. Degree. C.) | Pressure P (MPa) | Load F (kN) |
| 600 | 550 | 21 | 65 |
| 650 | 550 | 21 | 66 |
| 700 | 550 | 21 | 68 |
| 750 | 550 | 21 | 69 |
| 800 | 550 | 21 | 71 |
| 850 | 550 | 21 | 75 |
| 900 | 550 | 21 | 78 |
| 950 | 550 | 21 | 79 |
| 1000 | 550 | 21 | 83 |
When other parameters are unchanged and the temperature of the medium is changed, the stress condition of the front end fixing hanging bracket is as shown in table 2:
TABLE 2 stress parameter Table at temperature change
When other parameters are unchanged and the pressure of the medium is changed, the stress condition of the front end fixing hanging bracket is as shown in table 3:
TABLE 3 stress parameter table at pressure change
| Flow Q (t/h) | Temperature T (. Degree. C.) | Pressure P (MPa) | Load F (kN) |
| 900 | 550 | 10 | 74 |
| 900 | 550 | 11 | 75 |
| 900 | 550 | 12 | 75 |
| 900 | 550 | 13 | 76 |
| 900 | 550 | 14 | 76 |
| 900 | 550 | 16 | 77 |
| 900 | 550 | 18 | 77 |
| 900 | 550 | 20 | 78 |
| 900 | 550 | 21 | 78 |
Step four: according to the data of the calculation result, analyzing the load relation between each parameter and the front-end fixed hanging frame:
according to table 1, the curve of the relationship between the fitting flow and the front end fixed hanger load is shown in fig. 5, and the fitting stress calculation formula (a) is:
F＝f 1 (q)＝5E-05x 2 -0.0395x+69.324(A)
according to table 2, the curve of the relationship between the fitting temperature and the front end fixed hanger load is shown in fig. 6, and the fitting stress calculation formula (B) is:
F＝f 2 (t)＝0.0026x 2 -2.3025x+545.87(B)
according to table 3, the curve of the relationship between the fitting pressure and the front end fixed hanger load is shown in fig. 7, and the fitting force calculation formula (C) is:
F＝f 3 (p)＝-0.0191x 2 +0.9368x+66.741(C)
step five: step four, analyzing the relation of flow, temperature, pressure and load according to the single parameter corresponding relation, and obtaining a load calculation formula through mathematical iterative coupling calculation:
coupling calculation according to pressure to obtain formula (D)
F(Q,T,P)＝f 1 '(0)(Q-900)+f 2 '(0)(T-550)+f 3 (P)(D)
Coupling calculation according to temperature to obtain formula (E)
F(Q,T,P)＝f 1 '(0)(Q-900)+f 3 '(0)(P-21)+f 2 (T)(E)
Coupling calculation according to the flow to obtain a formula (F)
F(Q,T,P)＝f 2 '(0)(T-550)+f 3 '(0)(P-21)+f 1 (Q)(F)
Step six: performing coupling analysis on the simulation calculation results of the formulas (D), (E) and (F) in the step five and the data actually detected by the front-end boom force sensor, the rear-end boom force sensor, the left-side force sensor of the spring hanger and the right-side force sensor of the spring hanger, and finally obtaining a load coupling calculation formula of the front-end fixed hanger;
step seven: and repeating the steps three to six to obtain the load coupling function relation of the spring hanger and the rear end fixed hanger.
Further, the front end pipeline wall temperature sensor, the front end boom force sensor, the front end pipeline pressure sensor, the flow sensor, the rear end pipeline wall temperature sensor, the rear end pipeline pressure sensor, the rear end boom force sensor, the left side force sensor of the spring boom and the right side force sensor of the spring boom send signals to a computer; according to the boundary conditions, simulating and calculating stress change, fitting a single relation curve of parameters and loads, and according to a multi-parameter relation and a real-time stress detection signal, coupling calculation to obtain a final calculation formula; finally, the system completes the pipeline stress coupling analysis.
Further, after the coupling analysis is finished, a coupling function is obtained, and by using the function, all other supporting and hanging frames without stress measuring points can be dynamically analyzed to obtain stress; when the parameter change is detected, the analysis system automatically completes stress calculation of each suspension point, displays the stress calculation in real time, compares the stress calculation with a design value and a simulation calculation value, and realizes overrun alarm.
Further, analyzing a fitting curve relationship by utilizing a large amount of data of the temperature, the pressure and the flow of the pipeline medium, and performing associated coupling on each single curve; and correcting each coupling function by using the actual stress measurement result of each support and hanger, and finally dynamically analyzing the stress of other support and hangers without mounting measuring points by using the coupling function to realize risk early warning.
Compared with the prior art, the invention has the following advantages:
the system and the method for analyzing the pipeline stress coupling of the thermal power plant can consider a complex stack of data and a series of parameters which are seemingly irrelevant as a whole with correlation, and analyze the functional relation in the data by utilizing the big data, so as to couple the data into a formula capable of being calculated; meanwhile, the parameters are not seen in isolation, so that the problems can be seen in a connected way, and the problems can be found and solved more easily; meanwhile, the automatic analysis and the on-line monitoring of the stress of the pipe system are realized, and the state monitoring of the metal pipeline is realized; through design parameters and offline analysis of data, whether the data calculated in real time are normal or not can be analyzed, so that risk assessment of pipeline states is realized.
Therefore, the convenient pipeline stress state monitoring is realized, so that the pipeline overhaul work is more targeted, and the overhaul is scientifically and reasonably guided; meanwhile, a basis is provided for the effect evaluation of maintenance work, a pair of eyes is provided for operators, the state of the pipeline can be observed in real time, and the running risk is avoided; therefore, the thermal power plant pipeline stress coupling analysis system and the analysis method have the advantages of high technical content, strong innovation, high safety value, practical compliance and good operability.
Drawings
FIG. 1 is a schematic diagram of the connection relationship of a thermal power plant pipeline stress coupling analysis system according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a front end fixed hanger according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a rear end fixed hanger according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a spring hanger according to an embodiment of the present invention.
FIG. 5 is a graph showing the flow rate as a function of the front end fixed hanger load as fitted according to Table 1 in an embodiment of the present invention.
FIG. 6 is a graph showing a temperature dependence of a nose-mounted fixed hanger load as may be fitted according to Table 2 in accordance with an embodiment of the present invention.
FIG. 7 is a graphical representation of the fit pressure versus front end fixed hanger load according to Table 3 for an embodiment of the present invention.
In the figure: pipe 1, front end pipe wall temperature sensor 2, front end fixed hanger 3, front end hanger bar force sensor 4, front end pipe pressure sensor 5, spring hanger bar 6, flow sensor 7, rear end fixed hanger bar 8, rear end pipe wall temperature sensor 9, rear end pipe pressure sensor 10, rear end hanger bar force sensor 11, spring hanger bar left force sensor 12, computer 13, spring hanger bar right force sensor 14, structure fixed steel frame 15, fixed hanger bar upper hanger bar 16, fixed hanger bar lower hanger bar 17, spring hanger bar left pull bar 18, spring hanger bar right pull bar 19, left pressure plate 20, right pressure plate 21, left lock nut 22, right lock nut 23.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1 to 7, it should be understood that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are shown only for the purpose of understanding and reading by those skilled in the art, and are not intended to limit the applicable limitations of the present invention, so that any structural modification, change in proportion, or adjustment of size does not have any technical significance, and all fall within the scope of the technical content of the present invention without affecting the efficacy and achievement of the present invention. In the meantime, if the terms such as "upper", "lower", "left", "right", "middle" and "a" are used in the present specification, they are merely for convenience of description, but are not intended to limit the scope of the present invention, and the relative relation changes or modifications are considered to be within the scope of the present invention without substantial modification of the technical content.
The thermal power plant pipeline stress coupling analysis system in the embodiment comprises a pipeline 1, a front pipeline wall temperature sensor 2, a front end fixed hanging frame 3, a front end hanging rod force sensor 4, a front end pipeline pressure sensor 5, a spring hanging frame 6, a flow sensor 7, a rear end fixed hanging frame 8, a rear end pipeline wall temperature sensor 9, a rear end pipeline pressure sensor 10, a rear end hanging rod force sensor 11, a spring hanging frame left side force sensor 12, a computer 13, a spring hanging frame right side force sensor 14, a fixed hanging frame upper hanging rod 16, a fixed hanging frame lower hanging rod 17, a spring hanging frame left pull rod 18, a spring hanging frame right pull rod 19, a left pressing plate 20, a right pressing plate 21, a left side locking nut 22 and a right side locking nut 23.
The front end boom force sensor 4 in this embodiment is mounted on the front end fixed boom 3, the rear end boom force sensor 11 is mounted on the rear end fixed boom 8, the spring boom left side force sensor 12 and the spring boom right side force sensor 14 are mounted on both sides of the spring boom 6, respectively, and the front end pipe wall temperature sensor 2, the front end pipe pressure sensor 5, the flow sensor 7, the rear end pipe wall temperature sensor 9 and the rear end pipe pressure sensor 10 are all mounted on the pipe 1.
In this embodiment, the front end pipe wall temperature sensor 2 and the rear end pipe wall temperature sensor 9 are both installed on the outer side metal wall of the pipe 1 in a normal case, the front end fixing hanger 3, the rear end fixing hanger 8 and the spring hanger 6 are all connected with the pipe 1, and the front end pipe wall temperature sensor 2, the front end boom sensor 4, the front end pipe pressure sensor 5, the flow sensor 7, the rear end pipe wall temperature sensor 9, the rear end pipe pressure sensor 10, the rear end boom sensor 11 and the spring hanger right side sensor 14 are all connected with the computer 13.
In the embodiment, one end of a fixed hanger lower boom 17 in a front end fixed hanger 3 is connected with a pipeline 1, the other end of the fixed hanger lower boom 17 is connected with a front end boom force sensor 4, the front end boom force sensor 4 is connected with one end of a fixed hanger upper boom 16, and the other end of the fixed hanger upper boom 16 is connected with a structure fixed steel frame 15.
In this embodiment, one end of a fixed hanger lower boom 17 in a rear end fixed hanger 8 is connected to a pipeline 1, the other end of the fixed hanger lower boom 17 is connected to a rear end boom force sensor 11, the rear end boom force sensor 11 is connected to one end of a fixed hanger upper boom 16, and the other end of the fixed hanger upper boom 16 is connected to a structure fixed steel frame 15.
In the spring hanger 6 of this embodiment, one ends of a left pull rod 18 and a right pull rod 19 of the spring hanger are connected with the pipeline 1, the other ends of the left pull rod 18 and the right pull rod 19 of the spring hanger are penetrated through the structure fixing steel frame 15, a left force sensor 12 of the spring hanger is installed on the left pull rod 18 of the spring hanger through a left pressing plate 20 and a left locking nut 22, the left pressing plate 20 and the left locking nut 22 are all located above the structure fixing steel frame 15, a right force sensor 14 of the spring hanger is installed on the right pull rod 19 of the spring hanger through a right pressing plate 21 and a right locking nut 23, and the right pressing plate 21 and the right locking nut 23 are all located above the structure fixing steel frame 15.
The analysis method of the thermal power plant pipeline stress coupling analysis system in the embodiment is as follows:
step one: performing field investigation, collecting data such as a pipeline, a support hanger and a heat preservation layer, and calculating the loads of the front end fixed hanger 3, the spring hanger 6 and the rear end fixed hanger 8 under working conditions offline by utilizing the existing material mechanics formula according to the weight of the pipeline, the temperature, the pressure and the flow of a working medium;
step two: analyzing and sorting load data of the front end fixed hanging frame 3, the spring hanging frame 6 and the rear end fixed hanging frame 8 under different working conditions, and analyzing;
step three: the calculation results of the front-end fixed hanger 3 are first sorted as follows:
when other parameters are unchanged and the flow of the medium is changed, the stress condition of the front end fixing hanging bracket 3 is as shown in table 1:
TABLE 1 stress parameter table during flow rate variation
| Flow Q (t/h) | Temperature T (. Degree. C.) | Pressure P (MPa) | Load F (kN) |
| 600 | 550 | 21 | 65 |
| 650 | 550 | 21 | 66 |
| 700 | 550 | 21 | 68 |
| 750 | 550 | 21 | 69 |
| 800 | 550 | 21 | 71 |
| 850 | 550 | 21 | 75 |
| 900 | 550 | 21 | 78 |
| 950 | 550 | 21 | 79 |
| 1000 | 550 | 21 | 83 |
When other parameters are unchanged and the temperature of the medium is changed, the stress condition of the front end fixing hanging bracket 3 is as shown in table 2:
TABLE 2 stress parameter Table at temperature change
| Flow Q (t/h) | Temperature T (. Degree. C.) | Pressure P (MPa) | Load F (kN) |
| 900 | 510 | 21 | 59 |
| 900 | 515 | 21 | 60 |
| 900 | 520 | 21 | 62 |
| 900 | 525 | 21 | 65 |
| 900 | 530 | 21 | 68 |
| 900 | 535 | 21 | 70 |
| 900 | 540 | 21 | 72 |
| 900 | 545 | 21 | 76 |
| 900 | 550 | 21 | 78 |
When other parameters are unchanged and the pressure of the medium is changed, the stress condition of the front end fixing hanging bracket 3 is as shown in table 3:
TABLE 3 stress parameter table at pressure change
| Flow Q (t/h) | Temperature T (. Degree. C.) | Pressure P (MPa) | Load F (kN) |
| 900 | 550 | 10 | 74 |
| 900 | 550 | 11 | 75 |
| 900 | 550 | 12 | 75 |
| 900 | 550 | 13 | 76 |
| 900 | 550 | 14 | 76 |
| 900 | 550 | 16 | 77 |
| 900 | 550 | 18 | 77 |
| 900 | 550 | 20 | 78 |
| 900 | 550 | 21 | 78 |
Step four: according to the data of the calculation result, the load relation between each parameter and the front-end fixed hanging frame 3 is analyzed:
according to table 1, the curve of the relationship between the fitting flow and the load of the front-end fixed hanger 3 is shown in fig. 5, and the fitting stress calculation formula (a) is:
F＝f 1 (q)＝5E-05x 2 -0.0395x+69.324(A)
according to table 2, the curve of the relationship between the fitting temperature and the load of the front end fixed hanger 3 is shown in fig. 6, and the fitting stress calculation formula (B) is:
F＝f 2 (t)＝0.0026x 2 -2.3025x+545.87(B)
according to table 3, the curve of the relationship between the fitting pressure and the load of the front end fixed hanger 3 is shown in fig. 7, and the fitting force calculation formula (C) is:
F＝f 3 (p)＝-0.0191x 2 +0.9368x+66.741(C)
step five: step four, analyzing the relation of flow, temperature, pressure and load according to the single parameter corresponding relation, and obtaining a load calculation formula through mathematical iterative coupling calculation:
coupling calculation according to pressure to obtain formula (D)
F(Q,T,P)＝f 1 '(0)(Q-900)+f 2 '(0)(T-550)+f 3 (P)(D)
Coupling calculation according to temperature to obtain formula (E)
F(Q,T,P)＝f 1 '(0)(Q-900)+f 3 '(0)(P-21)+f 2 (T)(E)
Coupling calculation according to the flow to obtain a formula (F)
F(Q,T,P)＝f 2 '(0)(T-550)+f 3 '(0)(P-21)+f 1 (Q)(F)
Step six: performing coupling analysis on the simulation calculation results of the formulas (D), (E) and (F) in the step five and the data actually detected by the front-end boom force sensor 4, the rear-end boom force sensor 11, the left-side spring hanger force sensor 12 and the right-side spring hanger force sensor 14, and finally obtaining a load coupling calculation formula of the front-end fixed hanger 3;
step seven: and repeating the steps three to six to obtain the load coupling function relation of the spring hanger 6 and the rear end fixed hanger 8.
In the embodiment, a front end pipeline wall temperature sensor 2, a front end boom sensor 4, a front end pipeline pressure sensor 5, a flow sensor 7, a rear end pipeline wall temperature sensor 9, a rear end pipeline pressure sensor 10, a rear end boom sensor 11, a spring hanger left side sensor 12 and a spring hanger right side sensor 14 send signals to a computer 13; according to the boundary conditions, simulating and calculating stress change, fitting a single relation curve of parameters and loads, and according to a multi-parameter relation and a real-time stress detection signal, coupling calculation to obtain a final calculation formula; finally, the system completes the pipeline stress coupling analysis.
In the embodiment, the coupling analysis is finished to obtain a coupling function, and all other support and hanger frames without stress measuring points can be dynamically analyzed by using the coupling function to obtain stress; when the parameter change is detected, the analysis system automatically completes stress calculation of each suspension point, displays the stress calculation in real time, compares the stress calculation with a design value and a simulation calculation value, and realizes overrun alarm.
In the embodiment, a large amount of data of the temperature, the pressure and the flow of the pipeline medium are utilized to analyze the fitting curve relationship, and then each single curve is subjected to association coupling; and correcting each coupling function by using the actual stress measurement result of each support and hanger, and finally dynamically analyzing the stress of other support and hangers without mounting measuring points by using the coupling function to realize risk early warning.
In addition, it should be noted that the specific embodiments described in the present specification may vary from part to part, from name to name, etc., and the above description in the present specification is merely illustrative of the structure of the present invention. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present patent. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A thermal power factory pipeline stress coupling analysis system, its characterized in that: the device comprises a pipeline (1), a front pipeline wall temperature sensor (2), a front fixed hanging bracket (3), a front hanging rod force sensor (4), a front pipeline pressure sensor (5), a spring hanging bracket (6), a flow sensor (7), a rear fixed hanging bracket (8), a rear pipeline wall temperature sensor (9), a rear pipeline pressure sensor (10), a rear hanging rod force sensor (11), a spring hanging bracket left side force sensor (12), a computer (13), a spring hanging bracket right side force sensor (14), a spring hanging bracket left pull rod (18), a spring hanging bracket right pull rod (19), a left pressing plate (20), a right pressing plate (21), a left locking nut (22) and a right locking nut (23); the front end boom force sensor (4) is arranged on the front end fixed hanging bracket (3), the rear end boom force sensor (11) is arranged on the rear end fixed hanging bracket (8), the left side force sensor (12) of the spring hanging bracket and the right side force sensor (14) of the spring hanging bracket are respectively arranged on two sides of the spring hanging bracket (6), the front end pipeline wall temperature sensor (2), the front end pipeline pressure sensor (5), the flow sensor (7), the rear end pipeline wall temperature sensor (9) and the rear end pipeline pressure sensor (10) are all arranged on the pipeline (1), the front end pipeline wall temperature sensor (2), the front end boom force sensor (4), the front end pipeline pressure sensor (5), the flow sensor (7), the rear end pipeline wall temperature sensor (9), the rear end pipeline pressure sensor (10), the rear end boom force sensor (11) and the right side force sensor (14) are all connected with the computer (13), the front end hanging bracket (3), the rear end boom force sensor (8) and the spring hanging bracket (6) are all connected with the pipeline (1) and the pipeline wall temperature sensor (9) are all arranged on the outer side of the pipeline (1), one end of a left pull rod (18) of a spring hanger and one end of a right pull rod (19) of the spring hanger are connected with a pipeline (1), the other ends of the left pull rod (18) of the spring hanger and the right pull rod (19) of the spring hanger are all penetrated with a structure fixing steel frame (15), a left force sensor (12) of the spring hanger is installed on the left pull rod (18) of the spring hanger through a left pressing plate (20) and a left locking nut (22), the left pressing plate (20) and the left locking nut (22) are all located above the structure fixing steel frame (15), and a right force sensor (14) of the spring hanger is installed on the right pull rod (19) of the spring hanger through a right pressing plate (21) and a right locking nut (23), and the right pressing plate (21) and the right locking nut (23) are all located above the structure fixing steel frame (15).
2. The thermal power plant pipeline stress coupling analysis system according to claim 1, wherein: the device also comprises a fixed hanger upper suspender (16) and a fixed hanger lower suspender (17); one end of a fixed hanger lower hanger rod (17) is connected with the pipeline (1), the other end of the fixed hanger lower hanger rod (17) is connected with a front end hanger rod force sensor (4), the front end hanger rod force sensor (4) is connected with one end of a fixed hanger upper hanger rod (16), and the other end of the fixed hanger upper hanger rod (16) is connected with a structure fixed steel frame (15).
3. The thermal power plant pipeline stress coupling analysis system according to claim 1, wherein: the device also comprises a fixed hanger upper suspender (16) and a fixed hanger lower suspender (17); one end of a fixed hanger lower boom (17) is connected with a pipeline (1), the other end of the fixed hanger lower boom (17) is connected with a rear boom force sensor (11), the rear boom force sensor (11) is connected with one end of a fixed hanger upper boom (16), and the other end of the fixed hanger upper boom (16) is connected with a structure fixed steel frame (15).
4. An analysis method of a thermal power plant pipeline stress coupling analysis system according to any one of claims 1 to 3, characterized in that: the analysis method is as follows:
step one: performing field investigation, collecting related data of a pipeline, a support hanging bracket and a heat preservation layer, and calculating the load of the front end fixing hanging bracket (3), the spring hanging bracket (6) and the rear end hanging bracket (8) under all working conditions offline by utilizing the existing material mechanics formula according to the weight of the pipeline, the temperature, the pressure and the flow of a working medium;
step two: analyzing and sorting load data of the front end fixed hanging frame (3), the spring hanging frame (6) and the rear end fixed hanging frame (8) under different working conditions, and analyzing;
step three: firstly, the calculation results of the front end fixing hanging frame (3) are arranged as follows:
when other parameters are unchanged and the flow of the medium is changed, the stress condition of the front end fixing hanging bracket (3) is as shown in table 1:
TABLE 1 stress parameter table during flow rate variation
When other parameters are unchanged and the temperature of the medium is changed, the stress condition of the front end fixing hanging bracket (3) is as shown in table 2:
TABLE 2 stress parameter Table at temperature change
When other parameters are unchanged and the pressure of the medium is changed, the stress condition of the front end fixing hanging bracket (3) is as shown in table 3:
TABLE 3 stress parameter table at pressure change
Step four: according to the data of the calculation result, analyzing the load relation between each parameter and the front end fixed hanging frame (3):
according to table 1, the fit force calculation formula (a) is:
F＝f 1 (q)＝5E-05x 2 -0.0395x+69.324(A)
according to table 2, the fit force calculation formula (B) is:
F＝f 2 (t)＝0.0026x 2 -2.3025x+545.87(B)
according to table 3, the fit force calculation formula (C) is:
F＝f 3 (p)＝-0.0191x 2 +0.9368x+66.741(C)
step five: step four, analyzing the relation of flow, temperature, pressure and load according to the single parameter corresponding relation, and obtaining a load calculation formula through mathematical iterative coupling calculation:
coupling calculation according to pressure to obtain formula (D)
F(Q,T,P)＝f 1 '(0)(Q-900)+f 2 '(0)(T-550)+f 3 (P)(D)
Coupling calculation according to temperature to obtain formula (E)
F(Q,T,P)＝f 1 '(0)(Q-900)+f 3 '(0)(P-21)+f 2 (T)(E)
Coupling calculation according to the flow to obtain a formula (F)
F(Q,T,P)＝f 2 '(0)(T-550)+f 3 '(0)(P-21)+f 1 (Q)(F)
Step six: carrying out coupling analysis on the simulation calculation results of the formulas (D), (E) and (F) in the step five and the data actually detected by the front-end boom force sensor (4), the rear-end boom force sensor (11), the left-side spring hanger force sensor (12) and the right-side spring hanger force sensor (14), and finally obtaining a load coupling calculation formula of the front-end fixed hanger (3);
step seven: and repeating the steps three to six to obtain the load coupling function relation of the spring hanger (6) and the rear end fixed hanger (8).
5. The analysis method of the thermal power plant pipeline stress coupling analysis system according to claim 4, wherein: the front end pipeline wall temperature sensor (2), the front end boom force sensor (4), the front end pipeline pressure sensor (5), the flow sensor (7), the rear end pipeline wall temperature sensor (9), the rear end pipeline pressure sensor (10), the rear end boom force sensor (11), the left side force sensor (12) of the spring hanger and the right side force sensor (14) of the spring hanger send signals to the computer (13); according to the boundary conditions, simulating and calculating stress change, fitting a single relation curve of parameters and loads, and according to a multi-parameter relation and a real-time stress detection signal, coupling calculation to obtain a final calculation formula; finally, the system completes the pipeline stress coupling analysis.
6. The analysis method of the thermal power plant pipeline stress coupling analysis system according to claim 4, wherein: the coupling analysis is finished to obtain a coupling function, and all other supporting and hanging frames without stress measuring points are dynamically analyzed by using the coupling function to obtain stress; when the parameter change is detected, the analysis system automatically completes stress calculation of each suspension point, displays the stress calculation in real time, compares the stress calculation with a design value and a simulation calculation value, and realizes overrun alarm.
7. The analysis method of the thermal power plant pipeline stress coupling analysis system according to claim 4, wherein: analyzing a fitted curve relationship by utilizing a large amount of data of the temperature, the pressure and the flow of the pipeline medium, and performing associated coupling on each single curve; and correcting each coupling function by using the actual stress measurement result of each support and hanger, and finally dynamically analyzing the stress of other support and hangers without mounting measuring points by using the coupling function to realize risk early warning.
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