CN105091631A - Coaxial tubular heat exchanger with function of monitoring leakage in real time - Google Patents
Coaxial tubular heat exchanger with function of monitoring leakage in real time Download PDFInfo
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- CN105091631A CN105091631A CN201510551734.3A CN201510551734A CN105091631A CN 105091631 A CN105091631 A CN 105091631A CN 201510551734 A CN201510551734 A CN 201510551734A CN 105091631 A CN105091631 A CN 105091631A
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Abstract
The invention provides a coaxial tubular heat exchanger with the function of monitoring leakage in real time. According to the heat exchanger, a lining spiral channel coaxial heat exchange tube bundle and a multi-tube plate are adopted to form a monitoring channel, the monitoring channel is filled with protective gas with higher pressure, the contact, caused by leakage of a traditional heat exchange tube, of two kinds of fluid can be avoided, and the equipment safety is high. When an inner tube or an outer tube leaks, due to the fact that the fluid with the higher pressure in the monitoring channel enters the fluid on one side of the leakage tube through the defect of the inner tube or the outer tube, the pressure of the fluid in the monitoring channel is decreased, and then leakage can be accurately known through signals fed back by a pressure detector. According to the heat exchanger, a middle loop traditionally used as a safety barrier for preventing internal medium leakage is omitted, one-time construction investment cost is lowered, and the economic performance is improved.
Description
Technical field
The present invention relates to field of heat exchange, particularly relate to a kind of coaxial pipe heat exchanger possessing Real-Time Monitoring leakage function.
Background technology
At present, the kind of heat exchanger has a variety of, shell-and-tube heat exchanger its heat exchange tube wall conventional at nuclear power reactor occurs that interior leakage may occur defect, causes the serious consequence such as medium pollution, blast, even nuclear leakage after the mixing of two media.
For existing sodium-cooled fast reactor, as shown in Figure 1, adopt three loop heat-transfer system of sodium-sodium-water/vapour, the heat of primary Ioops cooling system is passed to secondary circuit main cooling system through intermediate heat exchanger, through vapor heat exchanger, heat is passed to water/vapour system again, such structure can prevent radiosodium in primary Ioops system from contacting with the aqueous phase in steam generator, avoids occurrence of large-area sodium-water reaction in steam generator, ensures the reactor core safety of reactor.
But, the setting of secondary coolant circuit system, a large amount of tubing, sodium valves, extra heat transmission equipment-intermediate heat exchanger and secondary sodium pump and the purification of corresponding sodium must be needed, sodium fills row etc., its direct result causes reactor system complexity, disposable investment costly, affects the economic performance in sodium-cooled fast reactor power station.
In the nuclear energy field that security requirement is very high, can not Real-Time Monitoring when leaking in heat exchanger is occurred, when particularly small seepage defect appears in heat exchange tube wall, cannot monitor, of a specified duration produces very large potential safety hazard by system.
Therefore, a kind of coaxial pipe heat exchanger possessing Real-Time Monitoring leakage function is provided to be necessary.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide and a kind ofly possess Real-Time Monitoring and reveal the coaxial pipe heat exchanger of function, for solving the problem that heat exchanger in prior art can not leak in Real-Time Monitoring.
For achieving the above object and other relevant objects, the invention provides and a kind ofly possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, described coaxial pipe heat exchanger at least comprises: shell, the first tube sheet, the second tube sheet and coaxial-type heat-exchanging tube bundle;
Described first tube sheet and the second tube sheet are installed in the housing, and described shell comprises the first housing, the second housing and the 3rd housing;
Described first housing and the first tube sheet form the first cavity, and described second housing and the second tube sheet form the second cavity; Described 3rd housing and the first tube sheet and the second tube sheet form the 3rd cavity;
Described coaxial-type heat-exchanging tube bundle comprises some heat exchanger tubes, and every root heat exchanger tube comprises outer tube, is nested in the interior pipe of described outer tube, forms helical duct between described shell and interior pipe;
The mouth of pipe of described interior pipe to be fixed on described first tube sheet and with described first cavity connects; The mouth of pipe of described outer tube is fixed on described second tube sheet, makes described helical duct and described 3rd cavity connects.
Alternatively, described first housing is provided with first fluid entrance and first fluid outlet, first fluid enters the first cavity by first fluid entrance, then enters interior pipe and carry out flowing out from first fluid outlet after heat exchange.
Alternatively, described second housing is provided with second fluid entrance and second fluid outlet, second fluid enters the second cavity by second fluid entrance, from second fluid outlet flows out after carrying out heat exchange along the outer wall of described outer tube.
Alternatively, described 3rd housing is provided with the 3rd fluid intake, and the 3rd fluid enters the 3rd cavity by the 3rd fluid intake, then enters helical duct, keeps certain pressure not circulate.
Alternatively, the pressure of described 3rd fluid is greater than the pressure of described first fluid and second fluid.
Alternatively, described 3rd fluid intake place is provided with pressure detector.
Alternatively, described 3rd fluid is nitrogen or inert gas.
Alternatively, the helical structure be looped around on described outer wall of inner tube is provided with in described helical duct.
Alternatively, the material of described helical structure is fine copper or copper alloy.
Alternatively, described helical structure all contacts with described outer wall of inner tube and outer tube wall.
Alternatively, in described first cavity, a baffle plate is also set, for isolating the first fluid before and after heat exchange.
Alternatively, described outer tube and interior pipe are U-tube, and described outer tube is arranged in the second cavity.
Alternatively, described outer tube and interior pipe are straight tube, and described outer tube is arranged in the second cavity.
Alternatively, described first tube sheet comprises the first plate and the second plate, and a mouth of pipe of described interior pipe is fixed on described first plate, another mouth of pipe is fixed on described second plate; Described second tube sheet comprises the 3rd plate and the 4th plate, and a mouth of pipe of described outer tube is fixed on described 3rd plate, another mouth of pipe is fixed on described 4th plate.
As mentioned above, a kind of coaxial pipe heat exchanger possessing Real-Time Monitoring leakage function of the present invention, there is following beneficial effect: adopt the monitoring channel that liner helical duct coaxial-type heat-exchanging tube bundle and multitube plate are formed, the protective gas of elevated pressures is filled with in this monitoring channel, traditional heat exchanger tube can be avoided to leak the contact of the two kinds of fluids caused, and device security is high; Even if occur that heat exchanger tube leaks also not influential system safety, even can continue to run, this measure substantially increases the security reliability of system.Because the elevated pressures of gas-monitoring and working media is poor, even if there is heat exchanger tube minor leakage, also can be amplified by the pressure monitor of gas-monitoring in real time and feed back leakage signal, improve sensitivity and the capability of fast response of heat exchanger leakage monitoring.In traditional heat exchangers, be integrated with the third gas-monitoring defencive function, use intermediate loop to cancel as the loop of safety curtain for preventing from leaking in medium tradition, thus reduce disposable investment expense, improve economic performance.
Accompanying drawing explanation
Fig. 1 is certain sodium-cooled fast reactor steam generator system schematic diagram in prior art.
Fig. 2 is the sodium-cooled fast reactor steam generator system schematic diagram that the present invention cancels intermediate loop.
Fig. 3 is the coaxial pipe heat exchanger overall structure schematic diagram possessing Real-Time Monitoring leakage function in embodiment one.
Fig. 4 is the structural representation of single heat exchange tube in coaxial-type heat-exchanging tube bundle in embodiment one.
Fig. 5 is the coaxial pipe heat exchanger overall structure schematic diagram possessing Real-Time Monitoring leakage function in embodiment two.
Element numbers explanation
1 first housing
101 first fluid entrances
102 first fluid outlets
2 second housings
201 second fluid entrances
202 second fluid outlets
3 the 3rd housings
301 the 3rd fluid intakes
4 first tube sheets
41 first plates
42 second plates
5 second tube sheets
51 the 3rd plates
52 the 4th plates
6 outer tubes
Pipe in 7
8 helical ducts
9 helical structures
10 first cavitys
11 second cavitys
12 the 3rd cavitys
13 baffle plates
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this description can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by detailed description of the invention different in addition, and the every details in this description also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to accompanying drawing.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Embodiment one
As shown in Figure 3, the present embodiment provides a kind of coaxial pipe heat exchanger possessing Real-Time Monitoring leakage function, and described coaxial-type heat exchanger at least comprises shell, the first tube sheet 4, second tube sheet 5 and coaxial-type heat-exchanging tube bundle.
Described shell comprises the first housing 1, second housing 2 and the 3rd housing 3.Described first housing 1 is provided with first fluid entrance 101 and first fluid outlet 102, described second housing 2 is provided with second fluid entrance 201 and second fluid outlet 202, described 3rd housing 3 is provided with the 3rd fluid intake 301.
Described first tube sheet 4 and the second tube sheet 5 are installed in the housing.Particularly, described first tube sheet 4 is between described first housing 1 and the 3rd housing 3, described second tube sheet 5 is between described 3rd housing 3 and the second housing 2, and described first housing 1 and the first tube sheet 4 form the first cavity 10, and described second housing 2 and the second tube sheet 5 form the second cavity 11; Described 3rd housing 3 and the first tube sheet 4 and the second tube sheet 5 form the 3rd cavity 12.
Described coaxial-type heat-exchanging tube bundle comprises some heat exchanger tubes, and as shown in Figure 3 and Figure 4, every root heat exchanger tube comprises outer tube 6, is nested in the interior pipe 7 of described outer tube 6 inside the structure of described heat exchanger tube, forms helical duct 8 between described shell 6 and interior pipe 7.
The mouth of pipe of described interior pipe 7 to be fixed on described first tube sheet 4 and to be communicated with described first cavity 10; The mouth of pipe of described outer tube 6 is fixed on described second tube sheet 5, and described helical duct 8 is communicated with described 3rd cavity 12.
In the present embodiment, described outer tube 6 is U-tube, and is arranged in the second cavity 11.Now, two mouths of pipe of described outer tube 6 are positioned at same level, and two mouths of pipe of described interior pipe 7 are also positioned at same level.In this case, two mouths of pipe of described outer tube 6 can be fixed on same tube sheet simultaneously, namely on the second tube sheet 5; Two mouths of pipe of described interior pipe 7 also can be fixed on same tube sheet simultaneously, namely on the first tube sheet 4.
Consider heat exchanger tube inner fluid the reason such as temperature, pressure and corrosion impact, described interior pipe 7 and outer tube 6 can select identical or different materials, to reach cost-saving object.Such as, described interior pipe 7 can be Hastelloy, and described outer tube 6 is Hastelloy or stainless steel 304 etc., does not limit at this.In addition, described outer tube 6 and interior pipe 7 are not limited to light pipe, and that is, as required, the surface of described outer tube 6 and interior pipe 7 also can arrange relief pattern etc.
During the coaxial pipe heat exchanger work that the present embodiment provides, pass into the fluid accordingly with a fixed difference difference by first fluid entrance 101 and second fluid entrance 201 respectively and carry out heat exchange.Specific works process is:
First fluid enters the first cavity 10 by described first fluid entrance 101, then enters after interior pipe 7 carries out heat exchange and 102 flow out from first fluid outlet and circulate.That is, after described first fluid enters the first cavity 10, with the internal face contact heat-exchanging of described interior pipe 7.In order to make first fluid along the flowing of correct path, in described first cavity 10, be provided with baffle plate 13, the first fluid before and after isolation heat exchange.
Second fluid enters the second cavity 11 by described second fluid entrance 201, from second fluid outlet 202 flows out and circulates after carrying out heat exchange along the outer wall of described outer tube 6.Namely after described second fluid enters the second cavity 11, with the outside wall surface contact heat-exchanging of described outer tube 6.
3rd fluid enters the 3rd cavity 12 by described 3rd fluid intake 301, then enters helical duct 8, keeps certain pressure not circulate.The 3rd fluid passing into described 3rd cavity 12 and helical duct 8 has higher pressure, keeps pressure stability.3rd fluid can as the high pressure barrier between first fluid and second fluid.Specific requirement formula is: P3> (P1, P2) max, wherein, P1 represents first fluid pressure, P2 represents second fluid pressure, and P3 represents the 3rd fluid pressure, and namely the pressure of described 3rd fluid should be greater than the pressure of described first fluid and second fluid.
All there is not gas or the liquid of physics or chemical reaction in described 3rd fluid requirements and first fluid, second fluid, can select nitrogen or inert gas etc. according to real medium.
The 3rd described fluid intake 301 is provided with pressure detector (diagram).Described pressure detector can detect whether described interior pipe 7 or outer tube 6 leak.When interior pipe 7 or outer tube 6 occur to leak, because the 3rd fluid pressure is greater than the pressure of first fluid and second fluid, 3rd fluid can enter in the fluid revealing pipe side by the defect of interior pipe 7 or outer tube 6, the pressure of described 3rd fluid is caused to reduce, the signal fed back by pressure detector definitely can learn the generation of leakage, so that take emergency measures.
Further, in order to strengthen the heat exchange between described first fluid and second fluid, the helical structure 9 of liner can be set in described helical duct 8, described helical structure 9 is looped around on described interior pipe 7 outer wall, preferably, described helical structure 9 directly with interior pipe 7 outer wall and outer tube 6 contact internal walls.
Cross section, the pitch of described helical structure 9 are not limited to uiform section and uniform pitch, can change according to actual needs.The cross sectional shape of described helical structure 9 can be circular, square etc., does not limit at this.Described helical structure 9 can be overall layout continuously, or step-by-step arrangement etc., do not limit at this.The helical structure 9 of liner selects to have thermal conductivity is good, ductility is good, linear expansivity is high fine copper or copper alloy etc., but is not limited to this.
The coaxial tubular type heat transfer equipment that the present embodiment provides is for Real-Time Monitoring leakage function, and by arranging the 3rd fluid passage, the two kinds of fluid contacts avoiding leakage conductance in heat exchanger to cause, this heat exchanger is safe and reliable.Be illustrated in figure 2 present invention eliminates and prevent from leaking in medium and as the intermediate loop (secondary circuit) of safety curtain, disposable investment expense can be reduced like this, improve economic performance.The coaxial pipe heat exchanger that the present embodiment provides can be widely used in nuclear energy, Aero-Space, petrochemical industry, dynamic power machine, food, medicine and other fields.
Embodiment two
The difference of the present embodiment and embodiment one is, two mouths of pipe of the present embodiment middle external tube 6 and interior pipe 7, not in same level, in this case, then need the tube sheet of differentiated levels to carry out the fixing of the mouth of pipe.
Exemplarily, described outer tube 6 and interior pipe 7 are straight tube, and described outer tube 6 is arranged in the second cavity 11.As shown in Figure 5, the mouth of pipe of two boards to described outer tube 6 and interior pipe 7 is needed to be fixed respectively.
Particularly, described first tube sheet comprises the first plate 41 and the second plate 42.A mouth of pipe of described interior pipe 7 is fixed on described first plate 41, another mouth of pipe is fixed on described second plate 42; Described second tube sheet comprises the 3rd plate 51 and the 4th plate 52, and a mouth of pipe of described outer tube 6 is fixed on described 3rd plate 51, another mouth of pipe is fixed on described 4th plate 52.
Compared with embodiment one, the first housing 1 in the present embodiment is split up into two parts, forms two the first cavitys, 10, two the first cavitys 10 be communicated with by interior pipe 7 with the first plate 41 and the second plate 42.Described first fluid entrance 101 and first fluid outlet 102 are separately positioned on two the first housings 1.
Described 3rd housing 3 is also split up into two parts, forms two the 3rd cavitys, 12, two the 3rd cavitys 12 be communicated with by helical duct 8 with the 3rd plate 51 and the 4th plate 52.3rd fluid intake 301 can be arranged on any position of the 3rd housing 3.
Described second housing 2 is a part, forms the 3rd cavity 11 with the 3rd plate 51 and the 4th plate 52, and described second fluid entrance 201 and second fluid outlet 202 are arranged on the second housing 2.
Described first fluid, second fluid are identical with embodiment one with the operation principle of the 3rd fluid in heat exchanger, no longer repeat at this.
In sum; the invention provides a kind of coaxial pipe heat exchanger possessing Real-Time Monitoring leakage function; the monitoring channel that this heat exchanger adopts liner helical duct coaxial-type heat-exchanging tube bundle and multitube plate to be formed; the protective gas of elevated pressures is filled with in this monitoring channel; traditional heat exchanger tube can be avoided to leak the contact of the two kinds of fluids caused, and device security is high.In traditional heat exchangers, be integrated with the third gas-monitoring defencive function, use intermediate loop to cancel as the loop of safety curtain for preventing from leaking in medium tradition, thus reduce disposable investment expense, improve economic performance.
So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (14)
1. possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that, described coaxial pipe heat exchanger at least comprises: shell, the first tube sheet, the second tube sheet and coaxial-type heat-exchanging tube bundle;
Described first tube sheet and the second tube sheet are installed in the housing, and described shell comprises the first housing, the second housing and the 3rd housing;
Described first housing and the first tube sheet form the first cavity, and described second housing and the second tube sheet form the second cavity; Described 3rd housing and the first tube sheet and the second tube sheet form the 3rd cavity;
Described coaxial-type heat-exchanging tube bundle comprises some heat exchanger tubes, and every root heat exchanger tube comprises outer tube and is nested in the interior pipe of described outer tube, forms helical duct between described shell and interior pipe;
The mouth of pipe of described interior pipe to be fixed on described first tube sheet and with described first cavity connects; The mouth of pipe of described outer tube is fixed on described second tube sheet, makes described helical duct and described 3rd cavity connects.
2. according to claim 1 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: described first housing is provided with first fluid entrance and first fluid outlet, first fluid enters the first cavity by first fluid entrance, then enters interior pipe and carry out flowing out from first fluid outlet after heat exchange.
3. according to claim 2 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: described second housing is provided with second fluid entrance and second fluid outlet, second fluid enters the second cavity by second fluid entrance, from second fluid outlet flows out after carrying out heat exchange along the outer wall of described outer tube.
4. according to claim 3 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: described 3rd housing is provided with the 3rd fluid intake, 3rd fluid enters the 3rd cavity by the 3rd fluid intake, then enters helical duct, keeps certain pressure not circulate.
5. according to claim 4 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: the pressure of described 3rd fluid is greater than the pressure of described first fluid and second fluid.
6. according to claim 4 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: described 3rd fluid intake place is provided with pressure detector.
7. according to claim 4 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: described 3rd fluid is nitrogen or inert gas.
8. according to claim 1 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: be provided with the helical structure be looped around on described outer wall of inner tube in described helical duct.
9. according to claim 8 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: the material of described helical structure is fine copper or copper alloy.
10. according to claim 8 possess the coaxial pipe heat exchanger that Real-Time Monitoring reveals function, it is characterized in that: described helical structure all contacts with described outer wall of inner tube and outer tube wall.
The 11. coaxial pipe heat exchangers possessing Real-Time Monitoring leakage function according to claim 2, is characterized in that: also arrange a baffle plate in described first cavity, for isolating the first fluid before and after heat exchange.
12. Real-Time Monitorings that possess according to any one of claim 1 ~ 11 reveal the coaxial pipe heat exchanger of function, it is characterized in that: described outer tube and interior pipe are U-tube, and described outer tube is arranged in the second cavity.
13. want the coaxial pipe heat exchanger possessing Real-Time Monitoring leakage function described in 1 ~ 10 any one according to right, it is characterized in that: described outer tube and interior pipe are straight tube, and described outer tube is arranged in the second cavity.
The 14. coaxial pipe heat exchangers possessing Real-Time Monitoring leakage function according to claim 13, it is characterized in that: described first tube sheet comprises the first plate and the second plate, a mouth of pipe of described interior pipe is fixed on described first plate, another mouth of pipe is fixed on described second plate; Described second tube sheet comprises the 3rd plate and the 4th plate, and a mouth of pipe of described outer tube is fixed on described 3rd plate, another mouth of pipe is fixed on described 4th plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510551734.3A CN105091631A (en) | 2015-09-01 | 2015-09-01 | Coaxial tubular heat exchanger with function of monitoring leakage in real time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510551734.3A CN105091631A (en) | 2015-09-01 | 2015-09-01 | Coaxial tubular heat exchanger with function of monitoring leakage in real time |
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| CN105091631A true CN105091631A (en) | 2015-11-25 |
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| CN201510551734.3A Pending CN105091631A (en) | 2015-09-01 | 2015-09-01 | Coaxial tubular heat exchanger with function of monitoring leakage in real time |
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| CN108981420A (en) * | 2018-05-07 | 2018-12-11 | 上海海事大学 | A kind of bilayer sleeve heat-exchanger rig suitable for hazardous fluids medium |
| CN110461464A (en) * | 2017-03-31 | 2019-11-15 | 株式会社Ihi | Annealing device |
| CN111981892A (en) * | 2020-07-31 | 2020-11-24 | 山东电力研究院 | Method for judging leakage of surface type steam-water heat exchanger |
| CN114543556A (en) * | 2021-12-28 | 2022-05-27 | 核动力运行研究所 | U-shaped double-wall heat transfer pipe direct-current steam generator |
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