CN202024625U - Indirect air cooling system capable of changing flow direction of cooling water - Google Patents
Indirect air cooling system capable of changing flow direction of cooling water Download PDFInfo
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- CN202024625U CN202024625U CN201120079559XU CN201120079559U CN202024625U CN 202024625 U CN202024625 U CN 202024625U CN 201120079559X U CN201120079559X U CN 201120079559XU CN 201120079559 U CN201120079559 U CN 201120079559U CN 202024625 U CN202024625 U CN 202024625U
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Abstract
The utility model relates to an indirect air cooling system capable of changing a flow direction of cooling water, which comprises a radiator (1) and an air cooling tower (2). The radiator (1) is a double flow path or multi-flow path radiator, and a first valve (4) and a second valve (5) which are used for changing the water flow direction are arranged on a water inlet and outlet pipeline (3). The indirect air cooling system capable of changing the flow direction of the cooling water has the advantages of being high in heat exchanging efficiency by utilizing a reversed cross flow in seasons needing no anti-freezing controls, and improving anti-freezing performance of the air cooling system by changing the radiator into a forward cross flow type radiator in winter.
Description
Technical field
The utility model relates to a kind of indirect air cooling system, is mainly used in the cooling of thermal power plant's condenser cooling water or subsidiary engine cooling water, also can be used as to be the air cooling system of cooling water in the pipe of industries such as chemical industry and iron and steel.
Background technology
Compare with traditional water-cooling system, the air cooling system water-saving result is remarkable, adopts the thermal power plant of air cooling technique to economize on water more than 85%.The main frame air cooling system of thermal power plant has two kinds, direct air cooling system and indirect air cooling system.The function of indirect air cooling system mainly is, by cooling water the heat in the exhaust steam in steam turbine condensation process in the condenser is taken away, cooling water enters radiator and air carries out heat exchange, by air heat is discharged from cooling tower again, and the temperature of cooling water is reduced.Compare with Direct Air-Cooled, indirect air cooling system have operating cost lowly, coal-fired consume less, to advantages such as ambient wind are insensitive, use more and morely at home at present.For improving heat exchange efficiency, technical development at present has a kind of trend, the radiator of indirect air cooling system is changed into the pattern of the reverse cross-current of double-current journey by the cross-current pattern of single process.The heat exchange efficiency of the reverse cross-current heat exchanger of this double-current journey improves 20 percent approximately than the efficient of original single process cross-current.After the radiator of indirect air cooling system changes the pattern raising heat exchange efficiency of the reverse cross-current of double-current journey into, not only reduced the heat exchange area of radiator, the cost of radiator is reduced, and reduced the appearance and size of air cooling tower, can reduce the cost of air cooling tower and some corollary apparatus, the gross investment of whole indirect air cooling system also can be reduced significantly.But,,, have the very big risk of freezing in the radiator tube behind the cooling water temperature because of winter environment temperature is low for the indirect air cooling system that uses in the northern area of China.In the winter time, the heat transfer temperature difference of cooling water and environment temperature increases, the exchange capability of heat of radiator increases, but at this moment domestic power load is on the low side, many electricity power enterprises may not be oeprations at full load, the thermic load of indirect air cooling system is less, reduces to reduce antifreezing measures such as heat exchange area by the air quantity and the cut-out radiator of radiator so must take to close shutter.When environment temperature was lower than 0 ℃, not only there is not advantage in the characteristic that the heat exchange efficiency of reverse cross-current radiator is high, and was unfavorable to antifreeze control on the contrary; If at this moment can reduce the heat transfer efficiency of radiator, can make antifreeze easier control.In practical engineering application, the cooling water temperature of second flow process in the double-current journey of reverse cross-current reduces, and the cold air with the radiator import carries out heat exchange again, and the low and skewness of temperature of water is unfavorable to the antifreeze control of indirect air cooling system in the pipe.
Summary of the invention
The purpose of this utility model is to overcome the reverse cross-current radiator of the above-mentioned double-current journey deficiency of antifreeze aspect in the winter time, a kind of indirect air cooling system that changes radiator cooling water flow direction is provided, can utilize the high characteristics of reverse cross-current heat exchange efficiency in the season that does not need antifreeze control, can in the winter time radiator be become forward cross-current pattern again, improve the resistance to frost of air cooling system.
The purpose of this utility model be achieved in that a kind of switch cooling water flow to indirect air cooling system, comprise radiator and air cooling tower, radiator is double-current journey or multipaths radiator, and first valve and second valve that switches water (flow) direction is set on the pipeline of the Inlet and outlet water of radiator.
The utility model switch cooling water flow to indirect air cooling system, more described radiator is divided into organizes or is divided into a plurality of cooling units, link to each other with the Inlet and outlet water house steward of the radiator pipeline of the Inlet and outlet water that forms radiator of the Inlet and outlet water arm of forming each radiator group of radiator or each cooling unit, the position of described first valve and second valve is arranged on the Inlet and outlet water house steward of pipeline, or is arranged on the Inlet and outlet water arm of pipeline.
The utility model switch cooling water flow to indirect air cooling system, described radiator is arranged vertically around the air cooling tower bottom, or horizontally disposed in air cooling tower.
The utility model switch cooling water flow to indirect air cooling system, described air cooling tower is the form of gravity-flow ventilation, or the form of mechanical draft.
The utility model is to use like this: the current journey of radiator is designed to double-current journey or multipaths, when needing antifreeze control in the winter time, the radiator water flow path direction is switched to the forward pattern of cross-current, to improve the resistance to frost of radiator; Do not need antifreeze in, the direction of conversion current again makes the pattern operation of radiator with reverse cross-current, with the heat exchange efficiency that improves radiator with increase exchange capability of heat.
About the reverse cross-current and the heat transfer characteristic of cross-current forward, we had once done test of many times to the radiator of double-current journey.Result of the test shows:
(1) under the identical condition of conditions such as heat exchange area, face velocity, heat transfer temperature difference, the exchange capability of heat of reverse cross-current is than forward cross-current is big more than 10;
(2) second flow process of reverse cross-current (flow process that refers to water) water at low temperature, with the radiator air inlet do not carry out heat exchange through the cold air that heats up, the distribution of coolant-temperature gage presents more inhomogeneous;
(3) forward the first pass high-temperature water of cross-current and cold air carry out heat exchange, and the Temperature Distribution of radiator is even relatively.
From these result of the tests, reverse cross-current heat exchange efficiency height, using when environment temperature is more than 0 ℃ to increase exchange capability of heat, but forward the cross-current resistance to frost is good, realizes antifreeze control easily, more is applicable to the cold winter of the northern area of China.
Description of drawings
Fig. 1 is for implementing embodiment 1 schematic diagram of the present utility model (switching the gravity-flow ventilation tower on the Inlet and outlet water house steward).
Fig. 2 is for implementing embodiment 2 schematic diagrames of the present utility model (switching the mechanical draft tower on the Inlet and outlet water house steward).
Fig. 3 is for implementing embodiment 3 schematic diagrames of the present utility model (switching the gravity-flow ventilation tower at the cooling unit arm).
Fig. 4 is for implementing embodiment 4 schematic diagrames of the present utility model (switching the mechanical draft tower at the cooling unit arm).
Fig. 5 is for implementing embodiment 5 schematic diagrames of the present utility model (radiator is horizontally disposed, and house steward is switched).
Fig. 6 is for implementing embodiment 6 schematic diagrames of the present utility model (radiator is horizontally disposed, and arm switches).
Among the figure:
Air intake A1, air-out A2
Water inlet B1, water outlet B2.
The specific embodiment
Referring to Fig. 1, the utility model switch cooling water flow to indirect air cooling system, form by radiator 1, air cooling tower 2, pipeline 3, first valve 4 and second valve 5.When there is not frozen risk in environment temperature greater than cooling water in 0 ℃, radiator 1, two first valves 4 are opened, close two second valves 5 simultaneously, make the flow direction of cooling water in radiator become the pattern of reverse cross-current, improve heat exchange efficiency, reduce the leaving water temperature of cooling water, the steam discharge back pressure of steam turbine is reduced as much as possible, to improve the economic benefit of electricity power enterprise.When environment temperature is equal to or less than 0 ℃, can close two first valves 4, open two second valves 5, make the current direction that enters radiator opposite with the front, become the forward pattern of cross-current, heat transfer efficiency reduces in this case, and the radiator water temperature distributes more even, be convenient to antifreeze control, help the indirect air cooling system security of operation in winter.
Embodiment 1:
Fig. 1 is for implementing embodiment 1 schematic diagram of the present utility model (switching the gravity-flow ventilation tower on the Inlet and outlet water house steward).Its air cooling tower 2 is forms of gravity-flow ventilation, radiator 1 is arranged vertically around air cooling tower 2 bottoms, air and the interior cooling water heat exchange of heat-transfer pipe back temperature through radiator 1 raise, atmosphere temperature rising enters air cooling tower 2, the density contrast of tower inner air and outer air and tower height degree will form draft in air cooling tower 2 bottoms, make air form convection current outside radiator 1 pipe.The radiator 1 of indirect air cooling system, because several cooling units of the more branch of quantity (or radiator group), each cooling unit Inlet and outlet water arm links to each other with house steward and forms pipeline 3.Embodiment 1 is provided with first valve 4 and second valve 5 that switches water (flow) direction on the house steward of the Inlet and outlet water of radiator 1, open when closing with second valve 5 when first valve 4, and radiator becomes reverse cross-current pattern, is applicable to that environment temperature is greater than 0 ℃ of condition; On the contrary, close first valve 4 and open second valve 5, radiator is changed into forward cross-current pattern, can be used for improving the performance of preventing freeze in winter.Embodiment 1 is provided with first valve 4 and second valve 5 on cooling water Inlet and outlet water house steward, the quantity of needed first valve 4 and second valve 5 is few, characteristics are that pipeline 3 is simple, but the current direction of all cooling units is all identical with the radiator pattern in the system, the control underaction.
Embodiment 2: embodiment 2 shown in Figure 2 is different with the air cooling tower of the above embodiments 1, and other parts are the same.The air cooling tower 2 of present embodiment 2 belongs to the form of mechanical draft, and air cooling tower 2 is made up of tower structure and blower fan two parts.Rely on the running of blower fan to form draft, make air pass through the radiator heat convection.Be used to switch first valve 4 of flow of cooling water direction and the Inlet and outlet water house steward that second valve 5 also is arranged on radiator 1, the switching mode of reverse cross-current and cross-current forward is identical with embodiment 1 with applicable elements.
Embodiment 3: Fig. 3 is arranged on first valve 4 and second valve 5 on the Inlet and outlet water arm of each radiator group of radiator 1 or each cooling unit, and air cooling tower 2 is forms of gravity-flow ventilation.Though first valve 4 and second valve 5 that the position is set is different with the position of embodiment 2 on pipeline 3 with the foregoing description 1, using method the same with purpose.The characteristics of this embodiment 3 are that control is flexible, but first valve 4 and second valve, 5 quantity are many, system is complicated.
Embodiment 4:
Among the embodiment 4 shown in Figure 4, what air cooling tower 2 adopted is the form of mechanical draft, and first valve 4 and second valve 5 are arranged on the Inlet and outlet water arm of each radiator group of radiator 1 or each cooling unit.Except that the pattern of the air cooling tower 2 of selecting mechanical draft for use, other is identical with embodiment 3.
Embodiment 5:
Fig. 5 and Fig. 6 are that radiator 1 adopts horizontally disposed situation.Radiator 1 is horizontally disposed in air cooling tower 2, and this and above-mentioned all embodiment are inequality.Present embodiment 5 is except that the horizontally disposed form of radiator 1, and other identical with embodiment 1 or embodiment 3 comprises the air cooling tower 2 that all adopts gravity-flow ventilation.
Claims (5)
- One kind switch cooling water flow to indirect air cooling system, comprise radiator (1) and air cooling tower (2), radiator (1) is double-current journey or multipaths radiator, it is characterized in that: first valve (4) and second valve (5) that switches water (flow) direction is set on the pipeline (3) of the Inlet and outlet water of radiator.
- 2. according to claim 1 a kind of switch cooling water flow to indirect air cooling system, it is characterized in that: more described radiator (1) is divided into organizes or is divided into a plurality of cooling units, link to each other with the Inlet and outlet water house steward of radiator (1) pipeline (3) of the Inlet and outlet water that forms radiator of the Inlet and outlet water arm of forming each radiator group of radiator (1) or each cooling unit, the position of described first valve (4) and second valve (5) are arranged on the Inlet and outlet water house steward of pipeline (3) or are arranged on the Inlet and outlet water arm of pipeline (3).
- 3. according to claim 1 and 2 a kind of switch cooling water flow to indirect air cooling system, it is characterized in that: described radiator (1) is arranged vertically around air cooling tower (2) bottom, or horizontally disposed in air cooling tower (2).
- 4. according to claim 1 and 2 a kind of switch cooling water flow to indirect air cooling system, it is characterized in that: described air cooling tower (2) is the form of gravity-flow ventilation, or the form of mechanical draft.
- 5. according to claim 3 a kind of switch cooling water flow to indirect air cooling system, it is characterized in that: described air cooling tower (2) is the form of gravity-flow ventilation, or the form of mechanical draft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120079559XU CN202024625U (en) | 2011-03-24 | 2011-03-24 | Indirect air cooling system capable of changing flow direction of cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120079559XU CN202024625U (en) | 2011-03-24 | 2011-03-24 | Indirect air cooling system capable of changing flow direction of cooling water |
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| CN202024625U true CN202024625U (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120079559XU Expired - Fee Related CN202024625U (en) | 2011-03-24 | 2011-03-24 | Indirect air cooling system capable of changing flow direction of cooling water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937312A (en) * | 2012-11-10 | 2013-02-20 | 清华大学 | Anti-freezing method for indirect evaporative water chilling unit capable of operating all year round and unit |
| CN103884200A (en) * | 2014-04-16 | 2014-06-25 | 山西科工龙盛科技有限公司 | Light-duty steel frame structure indirect air cooling tower capable of achieving water conservation and freeze protection |
| CN104613790A (en) * | 2014-12-19 | 2015-05-13 | 北京龙源冷却技术有限公司 | Sector anti-freezing method for indirect air cooling system |
| CN111272809A (en) * | 2020-03-04 | 2020-06-12 | 中国水利水电科学研究院 | Thermal performance test device for double-flow air cooling radiator |
| CN112283937A (en) * | 2020-11-21 | 2021-01-29 | 西安热工研究院有限公司 | Frost prevention system for water medium air heater and control method |
-
2011
- 2011-03-24 CN CN201120079559XU patent/CN202024625U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937312A (en) * | 2012-11-10 | 2013-02-20 | 清华大学 | Anti-freezing method for indirect evaporative water chilling unit capable of operating all year round and unit |
| CN102937312B (en) * | 2012-11-10 | 2015-02-18 | 清华大学 | Anti-freezing method for indirect evaporative water chilling unit capable of operating all year round and unit |
| CN103884200A (en) * | 2014-04-16 | 2014-06-25 | 山西科工龙盛科技有限公司 | Light-duty steel frame structure indirect air cooling tower capable of achieving water conservation and freeze protection |
| CN103884200B (en) * | 2014-04-16 | 2016-01-20 | 山西科工龙盛科技有限公司 | The indirect air cooling light-weight steel cage structure tower of anti-freezing economical can be realized |
| CN104613790A (en) * | 2014-12-19 | 2015-05-13 | 北京龙源冷却技术有限公司 | Sector anti-freezing method for indirect air cooling system |
| CN111272809A (en) * | 2020-03-04 | 2020-06-12 | 中国水利水电科学研究院 | Thermal performance test device for double-flow air cooling radiator |
| CN111272809B (en) * | 2020-03-04 | 2020-09-04 | 中国水利水电科学研究院 | Thermal performance test device for double-flow air cooling radiator |
| CN112283937A (en) * | 2020-11-21 | 2021-01-29 | 西安热工研究院有限公司 | Frost prevention system for water medium air heater and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20190324 |
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| CF01 | Termination of patent right due to non-payment of annual fee |