CN105651486A - Flow-induced heat exchanger tube bundle vibration testing system - Google Patents
Flow-induced heat exchanger tube bundle vibration testing system Download PDFInfo
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- CN105651486A CN105651486A CN201610157043.XA CN201610157043A CN105651486A CN 105651486 A CN105651486 A CN 105651486A CN 201610157043 A CN201610157043 A CN 201610157043A CN 105651486 A CN105651486 A CN 105651486A
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- heat exchanger
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
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Abstract
The invention discloses a flow-induced heat exchanger tube bundle vibration testing system. The system is mainly formed by connection of an inlet component, an experimental component and an outlet component. Two inlets of the inlet component are connected with a compressor for supplying gas and a centrifugal pump for supplying liquid respectively, a gas-liquid mixer is arranged on the upper portion of the inlet component, and a diffusion cavity is formed in the lower portion of the inlet component; fluid or a gas-liquid mixture flowing out of the outlet component enters a storage tank, and an outlet of the storage tank is connected with an inlet of the centrifugal pump; the experimental component is provided with a replaceable tube plate and a replaceable tube bundle so as to achieve testing of various tube bundles, a pressure gauge is installed at an access port of the experimental component, the inlet ends of a double-conducting probe and a dynamic strain measurement device are arranged on the wall surface, and the output ends of the double-conducting probe and the dynamic strain measurement device are connected with a computer. By the adoption of the system, single-phase and two-phase flow-induced heat exchanger tube bundle vibration testing can be conducted on tube bundles with different arrangement modes, lay ratios and tube materials under different operation parameters, parameters including critical flow velocity, amplitude and damping are obtained, and vibration performance under various working conditions is evaluated.
Description
Technical field
The present invention relates to heat exchanger tube vibration test test system, particularly relate to a kind of fluid induced heat exchanger tube vibration test test system.
Background technology
In process industrial, most of technical process all with heating, cool down and be incubated relevant, in order to realize the heat transmission between process stream, people are frequently with various types of heat exchangers, and it is wide variety of process equipment in chemical industry, oil, food, power, metallurgy, pharmacy and nuclear power industry. Wherein, the application of shell-and-tube heat exchanger is particularly extensive, in shell-and-tube heat exchanger, due to the setting of deflection plate so that the tube bank moment in heat exchanger is subject to washing away of horizontal stream, it is easy to damage inactivation occurs due to fluid-induced vibration. In the last few years, along with the maximization development of the raising and equipment that operate flow velocity in heat exchanger, thing followed heat exchanger flutter failure and failure accidents also increased year by year so that this kind of phenomenon causes the common concern of domestic and international project circle and correlational study person. Heat exchanger conventional in industry, such as: all there is two-phase fluid induced vibration in nuclear boiler, condenser and boiler, compares monophasic fluid induced vibration, and two-phase fluid induced vibration is increasingly complex.
Up to now, the vibration that tube bank is brought out, the checking method of existing comparative maturity and practical experience are flowed transversely through for one-way fluid. And bundle vibration is brought out for two phase flow, still there are some problems demand to probe into. Although having there are some for studying the single-phase experimental provision bringing out tube bundle vibration with two phase flow, but major part experimental provision can only carry out single-phase flow experiment, only least a portion of experimental provision may be used for two phase flow experiment, and have complicated operation and can the single shortcoming of research contents, the experimental provision bringing out tube bundle vibration about two phase flow easy and simple to handle urgently designs.
Summary of the invention
It is an object of the invention to provide a kind of fluid induced heat exchanger tube vibration test test system, be mainly used in recording void fraction, pipe flow speed and heat exchanger tube oscillating curve.This experimental system is possible not only to research tube bank when horizontal stream, the impact on tube bundle vibration of void fraction, arrangement mode, lay ratio and tubing, the vibration characteristics and critical flow velocity restrained at cross can also be studied, and then provide reference for the revision of relevant criterion and the vibration safety design of heat exchanger.
The technical solution adopted in the present invention is:
System of the present invention is mainly connected in sequence by inlet part, experimental part and spout member; Wherein:
The bottom of inlet part is diffusion chamber, and top is air and liquid mixer; Lower end, diffusion chamber is connected with gas distributor, and diffusion is provided with liquid inlet duct in the middle of chamber; Gas distributor is connected with compressor outlet with compressor outlet valve through tee ball valve, gas flowmeter successively; Liquid inlet duct is connected with spout member upper end through fluid flowmeter, outlet valve, centrifugal pump, inlet valve and storage tank successively;
The middle cylinder of experimental part is square-section, many rigid pipes and multiple flexible unit it is sequentially arranged with from bottom to up in middle cylinder along its length, left and right tube sheet is separately mounted to middle cylinder both sides, and many rigid pipe two ends are separately mounted in left and right tube sheet each hole;
Every rigidity heat exchanger tube two ends in multiple flexible units are connected with respective fixed mechanism and respective tensioning mechanism respectively through left qin steel wire and right qin steel wire;
The right qin steel wire of every rigidity heat exchanger tube in all measured flexible units is all pasted foil gauge and is connected with dynamic strain measurement instrument through test interface end cap by line; Experimental part lower inlet place is provided with the outfan of double; two conducting probe, dynamic strain measurement instrument and double; two conducting probes and is connected with computer; The import and export of experimental part are respectively provided with inlet pressure gauge and delivery gauge.
Described respective fixed mechanism structure is identical, and each fixed mechanism all includes bolt of cover, packing ring and left-hand thread insert; Left-hand thread insert is connected with the rigidity heat exchanger tube left end of flexible unit, bolt of cover is affixed by packing ring left tubesheet holes corresponding thereto, left qin steel wire one end is connected with left-hand thread insert, and the left qin steel wire other end passes the bolt of cover of left end and affixed with bolt of cover.
Described respective tensioning mechanism structure is identical, and each tensioning mechanism all includes left-hand thread insert, female thread insert and adjusting nut; Left-hand thread insert is connected with the rigidity heat exchanger tube right-hand member of flexible unit, tension baffle plate and support brace it is sequentially arranged with outside right tube plate, female thread insert one end is connected with tension plate hole, another stomidium of female thread insert is built with adjusting nut, right qin steel wire one end is connected with right-hand thread insert, the right qin steel wire other end embeds piece bores and affixed through adjusting nut centre bore and adjusting nut through female thread, and female thread insert is outer equipped with test interface port lid.
The lower inner wall of described middle cylinder is provided with positioning baffle, and positioning baffle contacts with tube sheet bottom surface, left and right, it is determined that left and right tube sheet vertical position in middle cylinder.
Described air and liquid mixer, the ripple packing being easy to air-liquid mixing is filled in inside.
Described measured flexible unit refers to the flexible unit being distributed in the middle of support brace.
The invention have the advantages that:
(1) this experimental system restrained and between tube sheet and middle cylinder, be removable connection, it is possible not only to obtain tested tube bank vibration characteristics at cross and critical flow velocity, and the arrangement mode of tube bank, lay ratio and tubing convection cell can be studied and bring out the impact of heat exchanger tube vibration.
(2) the flexible tube bank in this experimental system realizes the adjustment to tube bank natural frequency by screw-driven, and this control method is more stable, simple to operate, it is easy to accomplish.
(3) this experimental system can realize single-phase and two phase flow experiment, it is easy to contrast between the two.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of the present invention.
Fig. 2 is the structural principle schematic diagram of single flexible assembly.
In figure: 1, inlet part, 1.1, gas distributor, 1.2, diffusion chamber, 1.3, air and liquid mixer, 1.4, liquid inlet duct, 2, experimental part, 2.1, positioning baffle, 2.2, left and right tube sheet, 2.3, rigid pipe, 2.4, flexible unit, 2.4.1, bolt of cover, 2.4.2, left and right qin steel wire, 2.4.3, packing ring, 2.4.4, left and right threaded insert, 2.4.5, rigidity heat exchanger tube, 2.4.6, female thread insert, 2.4.7, adjusting nut, 2.5, middle cylinder, 2.6, test interface end cap, 2.7, foil gauge, 2.8, tension baffle plate, 2.9, support brace, 3, spout member, 4, storage tank, 5, inlet valve, 6, centrifugal pump, 7, outlet valve, 8, fluid flowmeter, 9, tee ball valve, 10, gas flowmeter, 11, compressor outlet valve, 12, compressor, 13, inlet pressure gauge, 14, delivery gauge, 15, double, two conducting probes, 16, computer, 17, dynamic strain measurement instrument.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
As it is shown in figure 1, system of the present invention is mainly connected in sequence by inlet part 1, experimental part 2 and spout member 3; Wherein:
Inlet part 1 entirety cross section from top to bottom is the square-section tapered into, and its underpart is diffusion chamber 1.2, and top is air and liquid mixer 1.3; Lower end, diffusion chamber 1.2 is connected with gas distributor 1.1, is provided with liquid inlet duct 1.4 in the middle of diffusion chamber 1.2; Gas distributor 1.1 is connected with compressor 12 outlet through tee ball valve 9, gas flowmeter 10 and compressor outlet valve 11 successively; Liquid inlet duct 1.4 is connected with spout member 3 upper end through fluid flowmeter 8, outlet valve 7, centrifugal pump 6, inlet valve 5 and storage tank 4 successively, and spout member 3 is overall cross section from top to bottom is the square-section tapered into.
The middle cylinder 2.5 of experimental part 2 is square-section, it is sequentially arranged with according to certain arrangement mode (such as square or triangle) and the many rigid pipes 2.3 arranged of lay ratio (such as 19/25 or 25/32) and multiple flexible unit 2.4 in middle cylinder 2.5 along its length from bottom to up, left and right tube sheet 2.2 is separately mounted to middle cylinder 2.5 both sides, and many rigid pipe 2.3 two ends are separately mounted in the respective hole of left and right tube sheet 2.2.
As shown in Figure 1 and Figure 2, every rigidity heat exchanger tube 2.4.5 two ends in multiple flexible units 2.4 are connected with respective fixed mechanism and respective tensioning mechanism respectively through left qin steel wire 2.4.2 and right qin steel wire 2.4.2.
The right qin steel wire 2.4.2 of every rigidity heat exchanger tube 2.4.5 in all measured flexible units 2.4 all pastes foil gauge 2.7 and is connected with dynamic strain measurement instrument 17 through test interface end cap 2.6 by line; Experimental part 2 lower inlet place is provided with the outfan of double; two conducting probe 15, dynamic strain measurement instrument 17 and double; two conducting probes 15 and is connected with computer 16; The import and export of experimental part 2 are respectively provided with inlet pressure gauge 13 and delivery gauge 14.
Described respective fixed mechanism structure is identical, and for a fixed mechanism, it includes bolt of cover 2.4.1, packing ring 2.4.3 and left-hand thread insert 2.4.4;Left-hand thread insert 2.4.4 is connected with the rigidity heat exchanger tube 2.4.5 left end of flexible unit, bolt of cover 2.4.1 is affixed by packing ring 2.4.3 left tube sheet 2.2 hole corresponding thereto, left qin steel wire 2.4.2 one end is connected with left-hand thread insert 2.4.4, and the left qin steel wire 2.4.2 other end passes the bolt of cover 2.4.1 of left end and affixed with bolt of cover 2.4.1.
Described respective tensioning mechanism structure is identical, and for a tensioning mechanism, it includes left-hand thread insert 2.4.4, female thread insert 2.4.6 and adjusting nut 2.4.7, left-hand thread insert 2.4.4 is connected with the rigidity heat exchanger tube 2.4.5 right-hand member of flexible unit, tension baffle plate 2.8 and support brace 2.9 it is sequentially arranged with outside right tube plate, female thread insert 2.4.6 one end is connected with support brace 2.9 hole, female thread another stomidium of insert 2.4.6 is built with adjusting nut 2.4.7, right qin steel wire 2.4.2 one end is connected with right-hand thread insert 2.4.4, the right qin steel wire 2.4.2 other end is affixed with adjusting nut 2.4.7 through female thread insert 2.4.6 hole traverse adjusting nut 2.4.7 centre bore, female thread insert 2.4.6 is outer equipped with test interface port lid 2.6.
The lower inner wall of described middle cylinder 2.5 is provided with positioning baffle 2.1, and positioning baffle 2.1 contacts with left and right tube sheet 2.2 bottom surface, it is determined that the left and right tube sheet 2.2 vertical position in middle cylinder 2.5.
Described air and liquid mixer 1.3, the regular plastic ripple filler being easy to air-liquid mixing according to the cutting of air and liquid mixer 1.3 inner wall size is filled in inside.
Described measured flexible unit refers to the flexible unit being distributed in the middle of support brace 2.9.
The operation principle of the present invention is as follows:
(1) single-phase flow experiment
With water for medium, the rigidity heat exchanger tube 2.4.5 that lay ratio is the stainless steel tube of the square arrangement of 19/25 carries out testing experiment. Utilize external source to inject enough water in storage tank 4, open the inlet valve 5 of centrifugal pump 6, and slowly open the outlet valve 7 of centrifugal pump 6, water is full of whole experimental provision. Then the outlet valve 7 of adjustment centrifugal pump 6 makes the reading of fluid flowmeter 8 be 8m3/ h, and observe the signal curve measured by dynamic strain measurement instrument 17, according to obtained natural frequency, the adjusting nut 2.4.7 of turn rigidity heat exchanger tube 2.4.5 right-hand member, by left and right qin steel wire, the natural frequency of all measured heat exchanger tubes (namely measured flexible pipe) is finely tuned so that it is identical. Afterwards, regulate the outlet valve 7 of centrifugal pump 6, change flow gradually, after the stable reading of fluid flowmeter 8 and inlet pressure gauge 13 and delivery gauge 14, preserve the signal curve measured by dynamic strain measurement instrument 17 under 15 different flows and according to its amplitude obtaining the vibration of measured flexible pipe and damping, and according to obtained as above to amplitude and flow velocity obtain critical flow velocity by mapping. Finally, close outlet valve 5 and inlet valve 7, and tee ball valve 9 is opened, discharge the water of residual in experimental provision.
(2) two phase flow experiment
With water and air for medium, the flow of water is 8m3/ h, the rigidity heat exchanger tube 2.4.5 that lay ratio is the stainless steel tube of the square arrangement of 19/25 carries out testing experiment. Utilize external source to inject enough water in storage tank 4, open the inlet valve 5 of centrifugal pump 6, and slowly open the outlet valve 7 of centrifugal pump 6, with relatively low flow, water is full of whole experimental provision. Then outlet valve 7 and compressor outlet valve 11 are regulated so that the reading of fluid flowmeter 8 and gas flowmeter 10 respectively 8m3/ h and 4m3/ h, and observe the signal curve measured by dynamic strain measurement instrument 17, according to obtained natural frequency, the adjusting nut 2.4.7 of turn rigidity heat exchanger tube 2.4.5 right-hand member, by left and right qin steel wire, the natural frequency of all measured heat exchanger tubes (namely measured flexible pipe) is finely tuned so that it is identical.Afterwards, the flow keeping water is constant, change the flow of air gradually, after the stable reading of gas flowmeter 10 and inlet pressure gauge 13 and delivery gauge 14, the reading of the gas flowmeter 10 under 10 different void fractions of record, inlet pressure gauge 13 and delivery gauge 14 respectively, preserve signal curve measured by dynamic strain measurement instrument 17 and according to its amplitude obtaining measured flexible pipe vibration and damping, and according to obtained as above to amplitude and flow velocity obtain critical flow velocity by mapping. Finally, close inlet valve 5 and outlet valve 7 and compressor outlet valve 11, and tee ball valve 9 is opened, discharge the water of residual in experimental provision.
Claims (6)
1. a fluid induced heat exchanger tube vibration test test system, it is characterised in that: this system is mainly connected in sequence by inlet part (1), experimental part (2) and spout member (3); Wherein:
The bottom of inlet part (1) is diffusion chamber (1.2), and top is air and liquid mixer (1.3); Diffusion chamber (1.2) lower end is connected with gas distributor (1.1), is provided with liquid inlet duct (1.4) in the middle of diffusion chamber (1.2); Gas distributor (1.1) is connected with compressor (12) outlet through tee ball valve (9), gas flowmeter (10) and compressor outlet valve (11) successively; Liquid inlet duct (1.4) is connected with spout member (3) upper end with storage tank (4) through fluid flowmeter (8), outlet valve (7), centrifugal pump (6), inlet valve (5) successively;
The middle cylinder (2.5) of experimental part (2) is square-section, many rigid pipes (2.3) and multiple flexible unit it is sequentially arranged with from bottom to up in middle cylinder (2.5) along its length, left and right tube sheet is separately mounted to middle cylinder (2.5) both sides, and many rigid pipe (2.3) two ends are separately mounted in left and right tube sheet each hole;
Every rigidity heat exchanger tube two ends in multiple flexible units are connected with respective fixed mechanism and respective tensioning mechanism respectively through left qin steel wire and right qin steel wire;
The right qin steel wire of every rigidity heat exchanger tube in all measured flexible units is all pasted foil gauge and is connected with dynamic strain measurement instrument (17) through test interface end cap (2.6) by line; Experimental part (2) lower inlet place is provided with the outfan of double; two conducting probe (15), dynamic strain measurement instrument (17) and double; two conducting probes (15) and is connected with computer (16); The import and export of experimental part (2) are respectively provided with inlet pressure gauge (13) and delivery gauge (14).
2. a kind of fluid induced heat exchanger tube vibration test test system according to claim 1, it is characterized in that: described respective fixed mechanism structure is identical, each fixed mechanism, all includes bolt of cover (2.4.1), packing ring (2.4.3) and left-hand thread insert; Left-hand thread insert is connected with the rigidity heat exchanger tube left end of flexible unit, bolt of cover (2.4.1) is affixed by packing ring (2.4.3) left tubesheet holes corresponding thereto, left qin steel wire one end is connected with left-hand thread insert (2.4.4), and the left qin steel wire other end passes the bolt of cover (2.4.1) of left end and affixed with bolt of cover (2.4.1).
3. a kind of fluid induced heat exchanger tube vibration test test system according to claim 1, it is characterized in that: described respective tensioning mechanism structure is identical, each tensioning mechanism, all includes left-hand thread insert, female thread insert (2.4.6) and adjusting nut (2.4.7), left-hand thread insert is connected with the rigidity heat exchanger tube right-hand member of flexible unit, tension baffle plate (2.8) and support brace (2.9) it is sequentially arranged with outside right tube plate, female thread insert (2.4.6) one end is connected with support brace (2.9) hole, female thread insert (2.4.6) another stomidium is built with adjusting nut (2.4.7), right qin steel wire one end is connected with right-hand thread insert, the right qin steel wire other end is affixed with adjusting nut (2.4.7) through female thread insert (2.4.6) hole traverse adjusting nut (2.4.7) centre bore, female thread insert (2.4.6) is outward equipped with test interface port lid (2.6).
4. a kind of fluid induced heat exchanger tube vibration test test system according to claim 1, it is characterized in that: the lower inner wall of described middle cylinder (2.5) is provided with positioning baffle (2.1), positioning baffle (2.1) contacts with left and right tube sheet (2.2) bottom surface, it is determined that the left and right tube sheet (2.2) vertical position in middle cylinder (2.5).
5. a kind of fluid induced heat exchanger tube vibration test test system according to claim 1, it is characterised in that: described air and liquid mixer (1.3), the ripple packing being easy to air-liquid mixing is filled in inside.
6. a kind of fluid induced heat exchanger tube vibration test test system according to claim 1, it is characterised in that: described measured flexible unit refers to the flexible unit being distributed in the middle of support brace (2.9).
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| CN201610157043.XA CN105651486B (en) | 2016-03-18 | 2016-03-18 | Fluid induced heat exchanger tube vibration test test system |
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| CN201610157043.XA CN105651486B (en) | 2016-03-18 | 2016-03-18 | Fluid induced heat exchanger tube vibration test test system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106769126A (en) * | 2016-11-28 | 2017-05-31 | 华南理工大学 | A kind of controllable pressure herringbone corrugated lamella heat exchanger stress-strain test system |
| CN107941457A (en) * | 2017-11-24 | 2018-04-20 | 西南石油大学 | A kind of tube bundle flow consolidates Coupled Dynamics vibration testing device and method |
| CN110196145A (en) * | 2019-06-27 | 2019-09-03 | 中广核研究院有限公司 | A kind of experimental rig and its application method causing vibration principle for verifying tube bundle flow |
| CN111665073A (en) * | 2020-07-20 | 2020-09-15 | 山东博然电力科技有限公司 | Test equipment with multi-direction observation gas-water heat exchanger |
| CN113375899A (en) * | 2021-05-14 | 2021-09-10 | 东方电气集团科学技术研究院有限公司 | Stress-strain testing method for flow-induced vibration of tube bundle structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107941457B (en) * | 2017-11-24 | 2019-05-10 | 西南石油大学 | A kind of tube bundle flow consolidates Coupled Dynamics vibration testing device and method |
| CN110196145A (en) * | 2019-06-27 | 2019-09-03 | 中广核研究院有限公司 | A kind of experimental rig and its application method causing vibration principle for verifying tube bundle flow |
| CN111665073A (en) * | 2020-07-20 | 2020-09-15 | 山东博然电力科技有限公司 | Test equipment with multi-direction observation gas-water heat exchanger |
| CN113375899A (en) * | 2021-05-14 | 2021-09-10 | 东方电气集团科学技术研究院有限公司 | Stress-strain testing method for flow-induced vibration of tube bundle structure |
| CN113375899B (en) * | 2021-05-14 | 2023-05-12 | 东方电气集团科学技术研究院有限公司 | Stress strain testing method for flow-induced vibration of tube bundle structure |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171117 |