CN103041888A - Visualized three-section natural circulation working segment - Google Patents
Visualized three-section natural circulation working segment Download PDFInfo
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- CN103041888A CN103041888A CN2012105449183A CN201210544918A CN103041888A CN 103041888 A CN103041888 A CN 103041888A CN 2012105449183 A CN2012105449183 A CN 2012105449183A CN 201210544918 A CN201210544918 A CN 201210544918A CN 103041888 A CN103041888 A CN 103041888A
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Abstract
The invention discloses a visualized three-section natural circulation working segment, which belongs to the technical fields of mechanical equipment and nuclear electric power generation. The visualized part of the working segment is divided into three sections; and one surface in the passageway of the three-section natural circulation working segment is a stainless steel heating backplane, while the other three surfaces are all heat resisting transparent quartz glass. The visualized three-section natural circulation working segment provided by the invention has the advantages that the working segment is easy to machine and assemble; the range of application is wide; a three-section visual window is adopted, so that the range of observation is wide, and sealing is easier to realize, while the sealing performance is better; in addition, the sealing requirements are lowered, and the sealing performance is improved, so that the working segment can be machined into various passageways more conveniently.
Description
Technical field
The invention belongs to plant equipment and nuclear energy power generation field, be specifically related to a kind of visual syllogic Natural Circulation active section, can carry out observed and recorded to the phenomenon in the passage in the running by transparent active section, thereby grasp intuitively the flow condition in the passage.Can long-time running under certain condition of work, be conducive to research and the application of plant equipment manufacturing, thermal-hydraulic aspect.
Background technology
Natural Circulation refers to by the circulating of the caused fluid of internal fluid density gradient, and density gradient is normally caused by the temperature field of fluid itself, thereby its exercise intensity also depends on the thermograde size.
Natural Circulation is very extensive in industrial application, in the boiler of thermal power plant, in the second generation nuclear reactor, among the third generation advanced nuclear reactor AP1000 with regard to more utilization the principle of Natural Circulation.
Boiler is the important component part of fired power generating unit, and its dynamic characteristic directly affects the even running of whole unit.The circulatory system in the boiler is exactly natural cycle system, generally boiler steam and water circuit is divided into down-comer, water-cooling wall, drum three parts, and this three part is descending branch, condenser and preheating section and the active section of corresponding natural cycle system respectively.And in the boiler running process, forming easily the large situation of drum wall temperature difference, the larger temperature difference can make the phenomenons such as drum occurs bending and deformation, and has a strong impact on the safe operation of drum.Therefore, in the drum running, if can see intuitively the variation that occurs in the drum, be conducive to analyze these and change the reason that produces, find out the method for removing or reducing these adverse effect factors.
Among the non-passive safety advanced nuclear plant AP1000, when non-LOCA event, the passive residual heat removal heat exchanger discharge residual heat of nuclear core of will meeting an urgent need.The end socket that top (entrance) and bottom (outlet) were restrained and be arranged in to this heat exchanger by one group of C type that is connected on the tube sheet forms.The suction line of heat exchanger is connected with RCS heat pipe section, and outlet line is connected with the cold chamber of the low head of steam generator, and they have formed the natural convection loop of a passive residual heat removal with RCS heat pipe section and cold leg.In this natural convection loop, residual heat removal exchanger is equivalent to the condenser in the natural cycle system, and reactor core then is equivalent to preheating section and active section, and the phenomenon that occurs in the reactor core affects the safety of whole reactor.Therefore, in the reactor core running, can be by the associated electronic device visual derivation that the phenomenon that occurs in the reactor core is real-time, and utilize the conversion equipment conversion to be presented on the control screen of master-control room, to help to analyze the reason that these phenomenons produce, and timely for these unfavorable factors, related measure is proposed, guarantee reactor safety stable operation.
But some of Natural Circulation form mechanism also not to be familiar with at present fully, therefore, need to be by setting up the Natural Circulation experimental stand, mode is by experiment explored the formation mechanism of more Natural Circulation.But, the active section major part of present experimental stand is not visual, the phenomenon in the observation experiment process intuitively, the visual active section of small part all is unistage type, and major part wherein can only be observed the phenomenon that occurs in the active section by the aperture on the active section, cause the experimental phenomena that to observe seldom, be not enough to prove absolutely some mechanism in the Natural Circulation process.
Most of Natural Circulation active section is through repeatedly repeatedly experiment, or the long operating pressure that all can occur of Applicative time descends gradually in engineering, and the phenomenon that sealing property reduces gradually can cause unpredictable impact to test result and staff's safety.Therefore, be necessary to design a kind of safer, better visual Natural Circulation active section of sealing property.
Summary of the invention
The invention provides a kind of visual syllogic Natural Circulation active section, the visual part of active section is divided into three sections, and in the described syllogic Natural Circulation working section channel, it is stainless steel heating backboard that a face is arranged, and its excess-three face is the thermostable transparent quartz glass.
Active section is vertically placed in system, and the active section lower end links to each other with preheating section, and the active section upper end links to each other with condenser, after working-medium water enters bringing-up section from lower end entrance, by flowing out bringing-up section by upper port after the observation of bringing-up section.
Various passages can be processed in active section inside; It is stainless steel heating backboard that passage has a face, and its excess-three face is transparency silica glass, records flow phenomenon in the visual active section by the high-speed camera instrument in the course of the work.
The whole active section length of described visual syllogic Natural Circulation active section is 120mm-1500mm, adopts three sections visual glass to seal installation, and the middle transition section adopts lower mode of burying passage to connect.Three sections every segment length scopes of glass are 50mm-500mm, and effectively observation window is 30mm-480mm, and then whole visible segments length range is 90mm-1440mm, and the thermostable transparent quartz glass is middle trough of belt structure.
Described visual syllogic Natural Circulation active section heating power can be set according to the actual requirements, and active section adopts the low voltage and high current heating plate to heat.The installation thermocouple that spiles on the steel plate overleaf, totally two rows, 10 of every rows are in order to record the variations in temperature of difference on the heating plate wall.
Visual active section is provided with attemperating unit, and when the temperature rise of heating plate wall surpassed 15 ℃/s, system will automatic cut-off power, and stopped heating is with the protection bringing-up section.
Described visual syllogic Natural Circulation active section working pressure range is 0.1MPa-4.4MPa, and temperature range is 0 ℃-350 ℃.Whole active section parcel is used for being incubated with the perlite material.Visual active section is by the electric insulation of the realization of wrap insulate material on bolt with other pipelines.
Beneficial effect of the present invention is:
Visual syllogic Natural Circulation active section provided by the invention, active section is easy to process and assemble, and is applied widely, adopts three sections visual windows, range of observation is large, easier realization sealing, and sealing property is better, seal request reduces, and sealing property is strengthened, and more conveniently is processed into various passages.
Active section can operation steady in a long-term under certain pressure and higher temperature, and it is large to have a visual range, and good seal performance is easy to be processed into the advantages such as various forms of passages.
Description of drawings
Fig. 1 is natural cycle system essential structure figure;
Fig. 2 is visual syllogic Natural Circulation active section top view;
Fig. 3 is visual syllogic active section A-A view among Fig. 2.
Number in the figure:
The 1-condenser; The 2-turbine flowmeter; The 3-preheating section; The 4-active section; The high temperature resistant quartz glass of 5-; The 6-steel plate; 7-heating tube patchhole.
The specific embodiment
The invention provides a kind of visual syllogic Natural Circulation active section, the invention will be further described below in conjunction with accompanying drawing.
Embodiment 1
A kind of visual syllogic Natural Circulation active section, the visual part of active section is divided into three sections, and in the described syllogic Natural Circulation working section channel, it is stainless steel heating backboard that a face is arranged, and its excess-three face is the thermostable transparent quartz glass.
Active section is vertically placed in system, and the active section lower end links to each other with preheating section, and the active section upper end links to each other with condenser, after working-medium water enters bringing-up section from lower end entrance, by flowing out bringing-up section by upper port after the observation of bringing-up section.
Various passages can be processed in active section inside; Record flow phenomenon in the visual active section by the high-speed camera instrument in the course of the work.
The whole active section length of described visual syllogic Natural Circulation active section is 120mm-1500mm, adopts three sections visual glass to seal installation, and the middle transition section adopts lower mode of burying passage to connect.Three sections every segment length scopes of glass are 50mm-500mm, and effectively observation window is 30mm-480mm, and then whole visible segments length range is 90mm-1440mm, and the thermostable transparent quartz glass is middle trough of belt structure.
Described visual syllogic Natural Circulation active section heating power can be set according to the actual requirements, and active section adopts the low voltage and high current heating plate to heat.The installation thermocouple that spiles on the steel plate overleaf, totally two rows, 10 of every rows are in order to record the variations in temperature of difference on the heating plate wall.
Visual active section is provided with attemperating unit, and when the temperature rise of heating plate wall surpassed 15 ℃/s, system will automatic cut-off power, and stopped heating is with the protection bringing-up section.
Described visual syllogic Natural Circulation active section working pressure range is 0.1MPa-4.4MPa, and temperature range is 0 ℃-350 ℃.Whole active section parcel is used for being incubated with the perlite material.Visual active section is by the electric insulation of the realization of wrap insulate material on bolt with other pipelines.
The workflow of this natural cycle system is: natural cycle system relies on the working-medium water in preheating section 3 and 4 pairs of circulatory systems of active section to heat, it is seethed with excitement in passage, the density contrast drive fluid of consequent active section and descending branch fluid is after process active section 4, rise in the condenser 1, and then through descending branch, get back in the preheater 3 by turbine flowmeter 2, form Natural Circulation.
In the related visual syllogic Natural Circulation active section 4, working-medium water is through after the heating of preheating section 3, enter the heat tunnel of active section 4 from the active section bottom, utilize electric heating tube to continue heating from preheater working-medium water out, make it in working section channel, produce various different flow patterns.
In the related visual syllogic Natural Circulation active section 4, in the active section running, utilize the high-speed camera instrument to record required flow phenomenon, utilize thermocouple measuring temperature, the temperature that records is through electric conversion equipment, and reflection output is on computer screen.
On the related visual active section 4 attemperating unit is arranged, when the temperature rise of heating plate wall surpassed 15 ℃/s, system will automatic cut-off power, and stopped heating is with the protection bringing-up section.
Related syllogic active section working pressure range is 0.1MPa-4.4MPa, and temperature range is 0 ℃-350 ℃.
The above; only for the better specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (9)
1. visual syllogic Natural Circulation active section, it is characterized in that: the visual part of active section is divided into three sections, and in the described syllogic Natural Circulation working section channel, it is stainless steel heating backboard that a face is arranged, and its excess-three face is the thermostable transparent quartz glass.
2. active section according to claim 1 is characterized in that: active section is vertically placed in system, and the active section lower end links to each other with preheating section, links to each other with condenser on the active section.
3. active section according to claim 1 is characterized in that: adopt three sections visual glass to seal installation, the middle transition section adopts lower mode of burying passage to connect.
4. active section according to claim 1, it is characterized in that: the whole active section length of described visual syllogic Natural Circulation active section is 120mm-1500mm, three sections every segment length scopes of glass are 50mm-500mm, effectively observation window is 30mm-480mm, and whole visible segments length range is 90mm-1440mm.
5. active section according to claim 1, it is characterized in that: the thermostable transparent quartz glass is middle trough of belt structure.
6. active section according to claim 1, it is characterized in that: installation thermocouple overleaf spiles on the steel plate.
7. active section according to claim 1, it is characterized in that: visual active section is provided with attemperating unit.
8. active section according to claim 1 is characterized in that: whole active section parcel is with the perlite material, is used for insulation.
9. active section according to claim 1 is characterized in that: visual active section is realized electric insulation with other pipelines by wrap insulate material on bolt.
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| CN2012105449183A CN103041888A (en) | 2012-12-14 | 2012-12-14 | Visualized three-section natural circulation working segment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347125A (en) * | 2013-07-31 | 2015-02-11 | 华北电力大学 | Double-channel natural circulation system device |
| CN108414406A (en) * | 2018-04-27 | 2018-08-17 | 华北电力大学 | A kind of overcritical form experimental system |
| CN115031922A (en) * | 2022-06-06 | 2022-09-09 | 四川大学 | Pressure-bearing three-side visual thermotechnical fluid experimental section with heating assembly |
Citations (5)
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| WO1999019706A1 (en) * | 1997-10-10 | 1999-04-22 | Apv North America, Inc. | A method of leak testing an assembled plate type heat exchanger |
| US20100242352A1 (en) * | 2009-06-09 | 2010-09-30 | Sundrop Fuels, Inc. | Systems and methods for reactor and receiver control of flux profile |
| CN102661845A (en) * | 2012-05-10 | 2012-09-12 | 华北电力大学 | Visualized narrow rectangular natural circulation system |
| CN202599639U (en) * | 2012-05-10 | 2012-12-12 | 华北电力大学 | Visual natural circulation system with narrow rectangular channel |
| CN202942897U (en) * | 2012-12-14 | 2013-05-22 | 华北电力大学 | Visual three-sectional natural circulating working section |
-
2012
- 2012-12-14 CN CN2012105449183A patent/CN103041888A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999019706A1 (en) * | 1997-10-10 | 1999-04-22 | Apv North America, Inc. | A method of leak testing an assembled plate type heat exchanger |
| US20100242352A1 (en) * | 2009-06-09 | 2010-09-30 | Sundrop Fuels, Inc. | Systems and methods for reactor and receiver control of flux profile |
| CN102661845A (en) * | 2012-05-10 | 2012-09-12 | 华北电力大学 | Visualized narrow rectangular natural circulation system |
| CN202599639U (en) * | 2012-05-10 | 2012-12-12 | 华北电力大学 | Visual natural circulation system with narrow rectangular channel |
| CN202942897U (en) * | 2012-12-14 | 2013-05-22 | 华北电力大学 | Visual three-sectional natural circulating working section |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104347125A (en) * | 2013-07-31 | 2015-02-11 | 华北电力大学 | Double-channel natural circulation system device |
| CN108414406A (en) * | 2018-04-27 | 2018-08-17 | 华北电力大学 | A kind of overcritical form experimental system |
| CN108414406B (en) * | 2018-04-27 | 2024-04-12 | 华北电力大学 | Supercritical window experiment system |
| CN115031922A (en) * | 2022-06-06 | 2022-09-09 | 四川大学 | Pressure-bearing three-side visual thermotechnical fluid experimental section with heating assembly |
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Application publication date: 20130417 |