CN109323599B - Direct air cooling unit with internal flow guide device - Google Patents
Direct air cooling unit with internal flow guide device Download PDFInfo
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- CN109323599B CN109323599B CN201811222276.9A CN201811222276A CN109323599B CN 109323599 B CN109323599 B CN 109323599B CN 201811222276 A CN201811222276 A CN 201811222276A CN 109323599 B CN109323599 B CN 109323599B
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- Prior art keywords
- cooling unit
- air cooling
- air
- flow guide
- guide
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
Abstract
A direct air cooling unit with an internal flow guide device is characterized in that the internal flow guide device is arranged in an △ -shaped channel space between fin tube bundles on the left side and fin tube bundles on the right side of the air cooling unit, the internal flow guide device is divided into two independent parts, namely a left flow guide assembly and a right flow guide assembly, and the two independent parts are arranged on two sides of the longitudinal axis of the air cooling unit, the flow guide plates of the internal flow guide device are parallel to the longitudinal axis of the air cooling unit and form a certain inclined included angle with the horizontal direction, and air entering below is guided to flow towards the air cooling fin tube bundles on the two sides, so that the speed distribution of the fin tube bundles of a condenser is more uniform, the heat transfer area of the tube bundles.
Description
Technical Field
The invention belongs to the technical field of air cooling of power stations. And more particularly to a direct air cooling unit having an internal deflector.
Background
Because of the great water-saving advantage, the direct air cooling technology is widely applied to the cold ends of power stations in coal-rich and water-deficient areas in the north of China. The direct air cooling system mainly comprises dozens of A-type air cooling units. The air cooling finned tube bundles are arranged on two sides of the air cooling unit, and an axial flow fan is installed at the bottom of the air cooling unit for forced ventilation, so that exhaust steam of a finned tube indoor turbine of the air cooling unit is cooled. Research shows that due to the rotation of the axial flow fan, the outlet flow field of the axial flow fan tends to rotate and rise, so that the surface temperature and the speed of the tube bundle of the condenser are not uniformly distributed, the surface air flow and the heat exchange quantity of the tube bundle of the condenser are not uniformly distributed, and the overall heat dissipation performance of the air cooling condenser is reduced, thereby influencing the safe and efficient operation of a direct air cooling unit.
By utilizing the large space between the air cooling tube bundle of the direct air cooling unit and the axial flow fan, the reorganization of a cooling air flow field can be realized by arranging the flow guide device with a certain structural shape, so that the defects of irregular outlet speed and disordered flow field of the axial flow fan are overcome, the uniform distribution of the head-on wind speed of the air cooling tube bundle is realized, the heat transfer area of the tube bundle is fully utilized, the heat transfer performance of the air cooling unit is improved, and the backpressure of a unit is reduced.
Disclosure of Invention
The invention aims to provide a direct air cooling unit with a built-in flow guide device, aiming at the defect that the heat transfer performance of an air cooling unit cannot be fully exerted due to flow field disorder and irregularity between an outlet of an air cooling fan and an air cooling finned tube bundle.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a direct air cooling unit with an internal flow guide device comprises an air cooling finned tube bundle, an axial flow fan and the internal flow guide device, wherein the air cooling finned tube bundle is obliquely arranged on the left side and the right side of the air cooling unit to form an A-shaped frame, and the axial flow fan is arranged at the bottom of the air cooling unit.
Furthermore, the A-shaped frame of the direct air cooling unit is formed by welding an upper steam distribution pipe and two rows of lower air cooling finned tube bundles; the footpath is arranged right above the fan and is parallel to the steam distribution pipe; the left side water conservancy diversion subassembly and the right side water conservancy diversion subassembly pass through bearing structure and install in the both sides of pavement.
Furthermore, the left side flow guide assembly and the right side flow guide assembly are composed of a plurality of flow guide plates; the guide plates form a multi-layer and multi-column structural form.
Furthermore, the number of the layers of the guide plate is 1-5; the upper and lower intervals of the adjacent guide plates are 0.5-1.5 m; each layer of guide plate group comprises 1-5 guide plates, and the left-right interval of each layer of adjacent guide plates is 0.5-1.5 m.
Furthermore, the inclined angles of the guide plates on all layers and the horizontal plane are different, and the inclined angle of the guide plate on the lower layer is larger than that of the guide plate on the upper layer.
Furthermore, the inclined included angle between the guide plate and the horizontal plane is 10-270 degrees.
Furthermore, the guide plate is rectangular, triangular or parallelogram.
Furthermore, the cross section of the guide plate adopts a certain wing-shaped structure.
Further, the left flow guide assembly and the right flow guide assembly are distributed around the axial line of the axial flow fan in a centrosymmetric manner; when the axial flow fan rotates clockwise, the left flow guide assembly is positioned at the lower end of the left side of the footpath, and the right flow guide assembly is positioned at the upper end of the right side of the footpath; or when the axial flow fan rotates anticlockwise, the left diversion assembly is positioned at the upper end of the left side of the footpath, and the right diversion assembly is positioned at the lower end of the right side of the footpath.
Furthermore, an adjusting unit is arranged between the guide plate and the supporting structure to adjust the position and the angle of the guide plate.
The invention has the beneficial effects that: the defect that the performance of a condenser tube bundle is not fully utilized due to the spirally rising flow field of the outlet of the air cooling fan and the special A-shaped frame body of the air cooling unit is relieved or even overcome, so that the overall heat exchange performance of the condenser of the air cooling unit can be effectively improved, and the running backpressure of a unit is reduced.
Drawings
FIG. 1 is a side view of an embodiment of the present invention;
FIG. 2 is a partial perspective view of an embodiment of the present invention
In the figure: the system comprises a steam distribution pipe 1, an air cooling finned tube bundle 2, a footpath 3, a flow guide device 4, a flow guide plate 5 and an axial flow fan 6.
Detailed Description
The present invention will be further described with reference to the accompanying fig. 1 and 2, it being understood that the description herein is only for the purpose of illustration and explanation and is not intended to limit the present invention.
As shown in fig. 1 and 2, the internal flow guiding device of the direct air cooling unit comprises: the system comprises a steam distribution pipe 1, an air-cooling finned tube bundle 2, a footpath 3, a support structure 4 and a guide plate 5; the direct air cooling unit A-shaped framework is formed by welding an upper steam distribution pipe 1 and two rows of lower air cooling finned tube bundles 2, the top ends of the two rows of air cooling finned tube bundles 2 are connected with the steam distribution pipe 1, and the air cooling finned tube bundles in the air cooling finned tube bundles 2 are arranged in parallel when each row of air cooling finned tube bundles is emptied; the axial flow fan 6 is arranged below the A-shaped frame body; the walkway 3 is provided directly above the fan 6 and parallel to the steam distribution pipes 1, and the fan 6 rotates to feed air into the air cooling unit.
The internal flow guide device is arranged in an △ -shaped passage space between the left fin tube bundle and the right fin tube bundle of the air cooling unit, the internal flow guide device is divided into a left flow guide assembly and a right flow guide assembly which are independent parts, the left flow guide assembly and the right flow guide assembly are composed of a plurality of flow guide plates, the flow guide plates form a multi-layer and multi-row structural form, are arranged on two sides of a longitudinal axis of the air cooling unit and are respectively positioned below the left air cooling fin tube bundle and the right air cooling fin tube bundle, and the flow guide plates of the internal flow guide device are parallel to the longitudinal axis of the air cooling unit and have certain inclined included angles with the horizontal direction to guide air entering from.
The number of the layers of the guide plates is 1-5; the upper and lower intervals of the adjacent guide plates are 0.5-1.5 m; each layer of guide plate group comprises 1-5 guide plates, and the left-right interval of each layer of adjacent guide plates is 0.5-1.5 m.
Preferably, the guide plate 5 is a rectangular steel plate with the thickness of 0.5mm, the width of the rectangular steel plate is 0.5m, the length-width ratio of the rectangular steel plate is 1, the rectangular steel plate is square, and anti-corrosion treatment is needed.
The guide plate group consists of an upper guide plate and a lower guide plate 5 which are parallel, the guide plate group is arranged at any position of two sides of the footpath 3 through a supporting structure 4, and the interval between the two guide plates 5 is 0.5 m; each guide plate group comprises two guide plates, the interval between the two guide plates is 0.5m, the two guide plates are laterally inclined towards the outer air-cooling fin tube bundle, the included angles between the two guide plates and the horizontal plane are the same, and the included angles are both 60 degrees; the guide plate group guides the air entering from the lower part to flow towards the oblique outer upper part of the direct air cooling unit (namely towards the direction of the air cooling finned tube bundle 2), so that the air velocity distribution flowing to each air cooling finned tube bundle is more uniform.
The inclined angles of the guide plates on all layers and the horizontal plane can be different, and the inclined angle of the guide plate on the lower layer is larger than that of the guide plate on the upper layer.
The inclined angle between the guide plate and the horizontal plane ranges from 10 degrees to 270 degrees.
The left flow guide assembly and the right flow guide assembly are distributed in a centrosymmetric manner around the axial line of the axial flow fan; when the axial flow fan rotates clockwise, the left flow guide assembly is positioned at the lower end of the left side of the footpath, and the right flow guide assembly is positioned at the upper end of the right side of the footpath; or when the axial flow fan rotates anticlockwise, the left diversion assembly is positioned at the upper end of the left side of the footpath, and the right diversion assembly is positioned at the lower end of the right side of the footpath.
In order to realize better guiding effect on the airflow, the guide plate can also adopt other plane shapes such as a triangle, a parallelogram, a rhombus and the like, and the cross section of the guide plate can also adopt a certain wing-shaped structure such as an air guide plate with an arc-shaped or V-shaped cross section.
The guide plate can set up the multilayer as required, and every layer can set up the polylith guide plate, and the adjustable change in the upper and lower interval of guide plate and left and right sides interval.
The supporting structure 4 is used for connecting and fixing the guide plate, one end of the supporting structure is connected to two sides of the footpath 3, and the other end of the supporting structure is used for connecting the guide plate.
The support structure 4 is a truss structure. An adjusting unit can be arranged between the guide plate and the supporting structure to adjust the position and the angle of the guide plate.
The guide plate 5 guides air to flow upwards in the implementation, so that the internal cooling air flow field of the air cooling unit is optimized, the uniform distribution of the flow rate of the finned tube bundle cooling air is realized, the heat exchange area of the tube bundle is fully utilized, the heat dissipation capacity of the air cooling condenser is improved, and the running backpressure of a direct air cooling unit is reduced.
Finally, it should be noted that: although the present invention has been described in detail, it will be apparent to those skilled in the art that changes may be made in the above embodiments, and equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A direct air cooling unit with an internal flow guide device comprises an air cooling finned tube bundle, an axial flow fan and the internal flow guide device, wherein the air cooling finned tube bundle is obliquely arranged at the left side and the right side of the air cooling unit to form an A-shaped frame, and the axial flow fan is arranged at the bottom of the air cooling unit;
the left guide assembly and the right guide assembly are composed of a plurality of guide plates; the guide plates form a multi-layer and multi-row structural form;
the inclined angles of the guide plates on all layers and the horizontal plane are different, and the inclined angle of the guide plate on the lower layer is larger than that of the guide plate on the upper layer;
the cross section of the guide plate adopts a certain wing-shaped structure, and an air guide plate with an arc-shaped or V-shaped cross section is adopted;
the left flow guide assembly and the right flow guide assembly are distributed around the axial line of the axial flow fan in a centrosymmetric manner; when the axial flow fan rotates clockwise, the left flow guide assembly is positioned at the lower end of the left side of the footpath, and the right flow guide assembly is positioned at the upper end of the right side of the footpath; or when the axial flow fan rotates anticlockwise, the left diversion assembly is positioned at the upper end of the left side of the footpath, and the right diversion assembly is positioned at the lower end of the right side of the footpath.
2. The direct air-cooling unit with internal baffles of claim 1, wherein the frame of the "a" shape of the direct air-cooling unit is formed by welding an upper steam distribution pipe and a lower two rows of air-cooling finned tube bundles; the footpath is arranged right above the fan and is parallel to the steam distribution pipe; the left side water conservancy diversion subassembly and the right side water conservancy diversion subassembly pass through bearing structure and install in the both sides of pavement.
3. The direct air-cooling unit with the internal flow guide device according to claim 1, wherein the number of the flow guide plates is 1-5; the upper and lower intervals of the adjacent guide plates are 0.5-1.5 m; each layer of guide plate group comprises 1-5 guide plates, and the left-right interval of each layer of adjacent guide plates is 0.5-1.5 m.
4. The direct air-cooling unit with internal baffles of claim 1, wherein the angle between the baffles and the horizontal plane is 10 ° to 270 °.
5. The direct air-cooling unit with internal baffles of claim 1, wherein the baffles are triangular or parallelogram shaped.
6. The direct air-cooling unit with internal air-guide device as claimed in claim 1, wherein an adjusting unit is provided between the air-guide plate and the supporting structure for adjusting the position and angle of the air-guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811222276.9A CN109323599B (en) | 2018-10-19 | 2018-10-19 | Direct air cooling unit with internal flow guide device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811222276.9A CN109323599B (en) | 2018-10-19 | 2018-10-19 | Direct air cooling unit with internal flow guide device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109323599A CN109323599A (en) | 2019-02-12 |
| CN109323599B true CN109323599B (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811222276.9A Expired - Fee Related CN109323599B (en) | 2018-10-19 | 2018-10-19 | Direct air cooling unit with internal flow guide device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883217A (en) * | 2019-03-28 | 2019-06-14 | 上海电力学院 | The condenser throat guiding device of uniform exit flow field |
Citations (5)
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|---|---|---|---|---|
| CN101403573A (en) * | 2008-11-20 | 2009-04-08 | 华北电力大学 | Cooling air flow guiding device of direct air cooling unit |
| CN101476823A (en) * | 2009-01-19 | 2009-07-08 | 北京交通大学 | Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system |
| CN201954977U (en) * | 2011-03-28 | 2011-08-31 | 华北电力大学（保定） | Radiating unit device for air cooling island of direct air cooling unit |
| CN204574851U (en) * | 2014-12-30 | 2015-08-19 | 宝志坚 | A kind of air cooling tubes condenser |
| CN105928378A (en) * | 2016-06-22 | 2016-09-07 | 国网山西省电力公司电力科学研究院 | Air cooling element, provided with horizontal wind preventing flow-guiding device, of direct air cooling unit |
-
2018
- 2018-10-19 CN CN201811222276.9A patent/CN109323599B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403573A (en) * | 2008-11-20 | 2009-04-08 | 华北电力大学 | Cooling air flow guiding device of direct air cooling unit |
| CN101476823A (en) * | 2009-01-19 | 2009-07-08 | 北京交通大学 | Internal steam conduction apparatus of direct air cooling branch-shaped exhaustion duct system |
| CN201954977U (en) * | 2011-03-28 | 2011-08-31 | 华北电力大学（保定） | Radiating unit device for air cooling island of direct air cooling unit |
| CN204574851U (en) * | 2014-12-30 | 2015-08-19 | 宝志坚 | A kind of air cooling tubes condenser |
| CN105928378A (en) * | 2016-06-22 | 2016-09-07 | 国网山西省电力公司电力科学研究院 | Air cooling element, provided with horizontal wind preventing flow-guiding device, of direct air cooling unit |
Non-Patent Citations (1)
| Title |
|---|
| 直接空冷机组空冷凝汽器性能优化研究;王江湖;《中国优秀硕士学位论文全文数据库》;20180330;第9-15页 * |
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Granted publication date: 20200410 Termination date: 20211019 |