CN100510595C - Full natural-circulating air cooling tower - Google Patents
Full natural-circulating air cooling tower Download PDFInfo
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- CN100510595C CN100510595C CNB2005100049907A CN200510004990A CN100510595C CN 100510595 C CN100510595 C CN 100510595C CN B2005100049907 A CNB2005100049907 A CN B2005100049907A CN 200510004990 A CN200510004990 A CN 200510004990A CN 100510595 C CN100510595 C CN 100510595C
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Abstract
Present invention relates to a heat exchanging apparatus, especially an all natural circulation atmospheric cooling tower used for normal pressure nuclear heat supply pile. Said all natural circulation atmospheric cooling tower includes tower body, heat transfer pipe, chimney, normal pressure pile secondary loop heat tube, rising pipe, expansion box, water tank, thermal insulation blanket and fins. Said structure characteristics effectively enlarge waterside natural circulation ability and air side reasonable natural circulation ability for ensuring transferring heat quantity to atmosphere for long time.
Description
Technical field
The present invention relates to a kind of heat-exchange apparatus, be specially the used full natural-circulating air cooling tower of a kind of normal pressure nuclear heat supplying pile.
Background technology
Along with the fast development of World Economics, the shortage of water resource has caused common people's extensive concern, and utilizing inexhaustible seawater resources is a desirable approach as the additional of human water resource that depends on for existence.For this reason, countries in the world have just begun the research and the exploration that utilize nuclear energy to carry out desalinization for many years, but still fail to realize the wide range of commercial application so far, its main cause is to build the safety issue and the desalinization facility for guaranteeing must pay high construction and operating cost and adopt the costliness of special material safely of the reactor of densely inhabited district in, make the fresh water production price can not with market competition, restricted its development.At present, adopt aluminium alloy to replace the expensive copper pipe or the low temperature multiple-effect distillation sea water desalting device of certain scale of titanium pipe to succeed in developing, if the nuclear heat supplying pile of supporting with it safe and reliable low cost energy successful Application, with making the production cost of nuclear heat supply desalinization have the bigger market competitiveness, use thereby obtain wide range of commercial.
Normal pressure heap is to use the fuel assembly of mature technology design, disintegration energy is converted to the reactor of heat energy at low temperatures.The reactor of this kind form adopts the pond shell-type to arrange, under low temperature, normal pressure, move, simplified equipment, simple, the operation convenience of system, have good inherent safety, the major accident of core meltdown can take place in no instance, the requirement of intervening outside the satisfied not needs factory, expenditure of construction and operating cost are low, floor space is little, can build near coastal area, the city, as the thermal source of desalinization, district heating.Owing to all adopt the mature technology in the nuclear power field, do not need to study in advance and technological development, therefore, can be directly used in commercial the application.
An outstanding feature of nuclear reactor is can not reduce to zero immediately at shutdown afterreaction heap power, still has long-time decay waste heat to discharge.If waste heat can not in time be derived after the shutdown, can have a strong impact on the safety of heap.Simultaneously,, need the waste heat cooling system of design full natural-circulating air cooling tower,, thereby guarantee the reactor safety shutdown so that under accident and shutdown condition, derive residual heat of nuclear core as the normal pressure heap based on the characteristics of normal pressure heap.
At present, cooling tower all has application comparatively widely at heat power station and nuclear power station.The tradition cooling tower is used for cooling off the water or the steam of higher temperature more, and adopts forced circulation and add spray equipment, its equipment complexity, and cost height.And, adopt conventional cooling tower design can not satisfy industrial application request for the water (as normal pressure heap, Industrial Boiler etc.) of chilling temperature about 100 ℃.Its reason mainly shows two aspects: the one, and the heat-transfer pipe of conventional air cooling tower is arranged in the bottom of tower body more, the air side circulation power is to improve wind speed by power-equipments such as blower fans, increase air humidity by spray and strengthen heat exchange, the circulation of water side can only provide dynamic head by pump, thereby the shortcoming of this project organization is both to have increased equipment to have increased cost, can not satisfy normal pressure and pile the requirement of desired non-energy dynamic characteristic; The 2nd, pile for normal temperature and pressure, because the temperature of water is lower, it is excessive to adopt traditional cooling tower project organization can cause the interior heat transfer area of cooling tower to reach the cooling tower volume too greatly, thereby causes required expense too high, can't reach the cost requirement of commercial operation.
Summary of the invention
The object of the present invention is to provide a kind of applicable to the low-temperature atmosphere-pressure reactor, full natural-circulating air cooling tower simple in structure, that cost is low.The architectural feature of this air cooling compressor has increased the natural-circulation capacity of water side effectively, guarantees to take a loop decay heat out of with enough fast speed, has improved the rational natural-circulation capacity of air side simultaneously and for a long time heat has been taken in the atmosphere with assurance.Full Natural Circulation mainly comprises the implication of two aspects: the one, and full natural circulation mode is adopted in the circulation of water side; The 2nd, full natural circulation mode (being free convection) is also adopted in the circulation of air side.
Technical scheme of the present invention is as follows: full natural-circulating air cooling tower, comprise tower body and be arranged on the interior heat-transfer pipe of tower body, tower body top is provided with chimney, also be provided with the tedge that is connected with normal pressure heap secondary circuit heat pipe section in the tower body, the top of tedge is provided with expansion tank, and expansion tank connects heat-transfer pipe, the heat-transfer pipe bottom connects a water tank, the water tank bottom is connected with normal pressure heap secondary circuit cold leg, and the tedge outside is surrounded by heat-insulation layer, and the heat-transfer pipe outside is provided with fin.
Be surrounded by heat-insulation layer in the tedge outside among the present invention, in order to reduce the transmission of heat; The heat-transfer pipe outside is provided with fin, in order to augmentation of heat transfer.Utilize the high density difference that the temperature difference caused higher between tedge and heat-transfer pipe, thereby increase lifting force, help increasing the natural-circulation capacity of secondary circuit.
Between heat-transfer pipe and normal pressure heap secondary circuit cold leg a water tank is set among the present invention, it mainly contains the effect of three aspects: the thermal capacity of secondary circuit when (1) can the increase accident; (2) increased water side Natural Circulation drive ram; (3) improved the economy that normal pressure is piled.When transient process begins, after the heat-transfer pipe of higher temperature goes out saliva and enters water tank, because the water tank water capacity is big and temperature is lower, lower through the temperature that can guarantee to enter the secondary circuit cold leg after mixing, increased the ability of accident starting stage afterheat cooling, the bigger temperature difference makes natural-circulation capacity be strengthened effectively simultaneously.In addition, the existence of water tank has reduced to enter the fluctuating temperature of secondary circuit cold leg effectively, therefore, has also more effectively guaranteed the Natural Circulation that secondary circuit water side keeps relative stability.
Among the present invention, make full use of the Changing Pattern that decay heat and water side natural circulation flow were passed along with cool time, can adopt less relatively heat transfer area by design, promptly less heat-transfer pipe radical has reduced cost, has improved the economy of normal pressure heap.
Among the present invention, less heat transfer area (being less heat-transfer pipe radical) will make that heat-transfer pipe inner outlet water temperature is higher, and the outside temperature difference increases in the heat exchanger tube, thereby heat exchange is strengthened.In addition, the heat-transfer pipe outside is provided with fin, guaranteeing that air side has under the situation of big flow, can strengthen heat exchange, has increased the heat that air is taken out of.
Description of drawings
Fig. 1 is the structural representation of full natural-circulating air cooling tower.
1. chimneys, 2. expansion tanks, 3. tedges, 4. heat-transfer pipes, 5. water tanks 6,7 among the figure, 8. isolating valve 9. heat-insulation layers 10. heat pipe sections 11. control valves 12. cold legs
The specific embodiment
As shown in Figure 1, a kind of full natural-circulating air cooling tower comprises tower body and is arranged on the tedge 3 that is connected with normal pressure heap secondary circuit heat pipe section 10 in the tower body, and tedge 3 vertically arranges, and the outside is surrounded by heat-insulation layer 9, and this heat-insulation layer 9 generally can use heat-preservation cotton.The top of tedge 3 is provided with expansion tank 2, and expansion tank 2 connects the heat-transfer pipe of vertically arranging 4.The main effect of expansion tank 2 is to be assigned in the heat-transfer pipe 4 water is more uniform, in addition, leave the nitrogen stabilization pressure space on the top of expansion tank 2, guarantee that secondary circuit pressure is all above a circuit pressure under any operating mode, can regulate pressure by the method that charges and discharge nitrogen according to specific requirement, to eliminate pressure oscillation, make the stable operation of device energy, the transition of also can in time releasing the pressure simultaneously.Also be provided with the general level measurement device in this area on the expansion tank 2, measure water level, detect and leak, interrupt to prevent Natural Circulation.Level measurement device can adopt the electric contact point fluviograph with intelligent decision, analytic function, and this type water level meter is usually used in the measurement of all kinds of water receptacle water levels; Perhaps adopt certainty of measurement height, good stability and Installation and Debugging liquid level gauge easily, it measures liquid level by the method for measuring fluid pressure.Heat-transfer pipe 4 bottoms connect a water tank 5, and water tank 5 bottoms are connected with normal pressure heap secondary circuit cold leg 12 again, water tank 5 the thermal capacity that can increase secondary circuit is set, and increase drive ram.Heat-transfer pipe 4 outsides are provided with fin, with augmentation of heat transfer.Tower body top is provided with chimney 1, is used for increasing the hot driving force of air side, to increase air mass flow.
On the tube connector of tedge 3 and normal pressure heap secondary circuit heat pipe section 10, be provided with pneumatic control valve 11, pneumatic control valve 11 is to come controlling opening of valve by regulating the gas signal, thereby adjusting natural circulation flow, this valve (accident conditions) when losing source of the gas is in normally open, be a non-active device, have the fail safe characteristic.In addition, on the tube connector of water tank 5 and normal pressure heap secondary circuit cold leg 12, be provided with isolating valve 7, thereby guaranteed under accident conditions, still can set up Natural Circulation effectively.
Claims (6)
1. full natural-circulating air cooling tower, comprise tower body and be arranged on the interior heat-transfer pipe (4) of tower body, tower body top is provided with chimney (1), it is characterized in that: be provided with the tedge (3) that is connected with normal pressure heap secondary circuit heat pipe section (10) in the tower body, the top of tedge (3) is provided with expansion tank (2), expansion tank (2) connects heat-transfer pipe (4), heat-transfer pipe (4) bottom connects a water tank (5), water tank (5) bottom is connected with normal pressure heap secondary circuit cold leg (12), tedge (3) outside is surrounded by heat-insulation layer (9), heat-transfer pipe (4) outside is provided with fin, and described full Natural Circulation is meant that water side and air side are the natural circulation mode heat exchange.
2. a kind of full natural-circulating air cooling tower as claimed in claim 1 is characterized in that: the nitrogen stabilization pressure space is left on the top of said expansion tank (2).
3. a kind of full natural-circulating air cooling tower as claimed in claim 2 is characterized in that: said expansion tank (2) is provided with level measurement device.
4. a kind of full natural-circulating air cooling tower as claimed in claim 1 is characterized in that: tedge (3) is all vertically arranged with heat-transfer pipe (4).
5. as claim 1 or 4 described a kind of full natural-circulating air cooling towers, it is characterized in that: on the tube connector of tedge (3) and normal pressure heap secondary circuit heat pipe section (10), be provided with pneumatic control valve (11).
6. as claim 1 or 4 described a kind of full natural-circulating air cooling towers, it is characterized in that: on the tube connector of water tank (5) and normal pressure heap secondary circuit cold leg (12), be provided with isolating valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100049907A CN100510595C (en) | 2005-02-01 | 2005-02-01 | Full natural-circulating air cooling tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100049907A CN100510595C (en) | 2005-02-01 | 2005-02-01 | Full natural-circulating air cooling tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1815121A CN1815121A (en) | 2006-08-09 |
| CN100510595C true CN100510595C (en) | 2009-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100049907A Expired - Fee Related CN100510595C (en) | 2005-02-01 | 2005-02-01 | Full natural-circulating air cooling tower |
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| Country | Link |
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| CN (1) | CN100510595C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102667952A (en) * | 2009-11-12 | 2012-09-12 | 三菱重工业株式会社 | Emergency reactor core cooling device and nuclear reactor facility |
| CN101846460B (en) * | 2010-06-21 | 2012-07-04 | 中广核工程有限公司 | Nuclear grade cooling tower |
| CN103196945B (en) * | 2013-03-18 | 2014-12-17 | 哈尔滨工程大学 | Condensation heat-transfer experiment device capable of realizing coupling of natural circulation and forced circulation |
| CN104261499B (en) * | 2014-10-09 | 2016-02-24 | 中国科学院广州能源研究所 | A kind of thermal gradient energy of sea water natural circulation sea water desalinating plant and desalination method |
| CN112551623B (en) * | 2020-11-26 | 2022-10-04 | 中国核电工程有限公司 | Nuclear energy small-sized reactor seawater desalination system |
-
2005
- 2005-02-01 CN CNB2005100049907A patent/CN100510595C/en not_active Expired - Fee Related
Non-Patent Citations (9)
| Title |
|---|
| 200MW核供热堆余热排出系统排热能力及其影响因素分析. 廖义香，秋穗正等.原子能科学技术，第35卷第5期. 2001 |
| 200MW核供热堆余热排出系统排热能力及其影响因素分析. 廖义香，秋穗正等.原子能科学技术，第35卷第5期. 2001 * |
| 5MW低温核供热堆的研制和运行特性. 王大中，董铎等.清华大学学报，第31卷第3期. 1991 |
| 5MW低温核供热堆的研制和运行特性. 王大中，董铎等.清华大学学报，第31卷第3期. 1991 * |
| 油媒式余热回收装置在热风炉上的应用. 刘元意，顾延春.冶金能源，第15卷第5期. 1996 |
| 油媒式余热回收装置在热风炉上的应用. 刘元意，顾延春.冶金能源，第15卷第5期. 1996 * |
| 自然循环的余热排出系统的分析. 彭木彰，万渡江，高勇.清华大学学报，第36卷第12期. 1996 |
| 非能动安全系统在200MW核供热堆中的应用. 厉日竹，王金海等.核动力工程，第22卷第4期. 2001 |
| 非能动安全系统在200MW核供热堆中的应用. 厉日竹，王金海等.核动力工程，第22卷第4期. 2001 * |
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| CN1815121A (en) | 2006-08-09 |
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