CN113048805A - Pipe bundle micro-inclination arrangement method capable of increasing heat exchange area of indirect air cooling tower - Google Patents
Pipe bundle micro-inclination arrangement method capable of increasing heat exchange area of indirect air cooling tower Download PDFInfo
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- CN113048805A CN113048805A CN202110513349.5A CN202110513349A CN113048805A CN 113048805 A CN113048805 A CN 113048805A CN 202110513349 A CN202110513349 A CN 202110513349A CN 113048805 A CN113048805 A CN 113048805A
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- 238000001816 cooling Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- PMGQWSIVQFOFOQ-YKVZVUFRSA-N clemastine fumarate Chemical group OC(=O)\C=C\C(O)=O.CN1CCC[C@@H]1CCO[C@@](C)(C=1C=CC(Cl)=CC=1)C1=CC=CC=C1 PMGQWSIVQFOFOQ-YKVZVUFRSA-N 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A method for arranging tube bundles in a slightly inclined manner is capable of increasing the heat exchange area of an indirect air cooling tower. The finned tube radiator is obliquely arranged according to a preset angle, so that the area of the finned tube radiator can be increased under the condition that the height of an air inlet of the indirect air cooling tower and the overall structure size of a tower body are not changed; or under the condition that the area of the total finned tube radiator is not changed, the height of the air inlet can be reduced, the tower height is reduced, and the manufacturing cost and the construction difficulty of the indirect air cooling tower are reduced. The micro-inclination angle of the finned tube radiator has a minimum value, the minimum value can be directly solved through a function, the calculation and programming are easy, and the micro-inclination angle of the finned tube radiator of the indirect air cooling tower is selected within the range of 90 degrees to the minimum value. The implementation of the method for arranging the tube bundles in a slightly inclined manner, which can increase the heat exchange area of the indirect air cooling tower, has important significance in optimizing the structural design of the indirect air cooling tower.
Description
Technical Field
The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a method for arranging a pipe bundle in a slightly inclined manner, wherein the pipe bundle can increase the heat exchange area of an indirect air cooling tower.
Background
The advent and development of air cooling technology has helped solve the problem of water shortage and environmental protection. The air cooling system is widely applied to a plurality of power plants and chemical plants by virtue of the obvious advantages of water saving and emission reduction, particularly in arid areas with rich coal resources. According to different cooling modes, the system can be divided into a direct air cooling system and an indirect air cooling system. The indirect air cooling system adopts a natural ventilation mode, utilizes the draft force generated by the density difference of the air inside and outside the indirect cooling tower to drive the ambient air to flow through the air cooling radiator to realize heat exchange, and has the characteristics of low running back pressure, low service power consumption, good running economy of a power plant and the like.
The finned tube radiator is a main heat transfer element of the indirect air cooling tower, and the heat transfer performance of the finned tube radiator directly influences the heat exchange effect of an air cooling system. Another key point in the design of indirect air cooling systems is cost reduction. The cost of the indirect air cooling tower is closely related to the geometric dimension, such as the ratio of the height of the tower to the diameter of the bottom of the tower, the distance between the towers and the diameter of the tower, the hyperbolic cooling tower type, the throat radius and the like. In summary, the size of the tower body is reduced as much as possible and the construction cost is reduced under the condition that the heat exchange effect of the finned tube radiator is not influenced and the cooling requirement of the unit is met. The tube distribution mode of the finned tube radiator of the indirect air cooling tower is very critical to the heat exchange performance and the construction cost of the indirect air cooling tower, and has important significance for optimizing the structural design of the indirect air cooling tower.
Disclosure of Invention
The invention aims to provide a method for arranging tube bundles in a slightly inclined manner, which can increase the heat exchange area of an indirect air cooling tower.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a method for arranging a pipe bundle with a slight inclination capable of increasing the heat exchange area of an indirect air cooling tower is characterized in that a finned pipe radiator of the indirect air cooling tower is arranged in an inclined mode according to a preset angle, and the area of the finned pipe radiator is increased under the condition that the height of an air inlet of the indirect air cooling tower and the overall structure size of the indirect air cooling tower are not changed.
The invention is further improved in that the area of the original vertically arranged finned tube radiator is set as S, and the area of the finned tube radiator which can be arranged when the finned tube radiator is arranged at an inclined angle alpha is set as S1The calculation formula is shown in formula (1):
the invention is further improved in that the inclination angle alpha of the finned tube radiator of the indirect air cooling tower has a minimum value alphaminThe calculation formula is shown as formula (2):
wherein:
h: the height of an air inlet of the indirect air cooling tower;
c: the perimeter of the air inlet.
The invention is further improved in that the value of the inclination angle alpha of the finned tube radiator of the indirect air cooling tower is alphamin～90°。
The invention is further improved in that the air inlet is arranged at the height of the air inletUnder the condition of unchanged arrangement, the area of the finned tube radiator arranged at the inclined angle alpha can be increased
The further improvement of the invention is that under the condition that the area S of the finned tube radiator is not changed, the height of the air inlet is h when the radiator is vertically arranged, and the height of the air inlet is h sin alpha when the inclination angle alpha of the finned tube radiator of the indirect air cooling tower is arranged, wherein sin alpha is more than 0 and less than or equal to 1, and h sin alpha is less than or equal to h.
The invention has the further improvement that under the condition that the area of the finned tube radiator is not changed, the height of the air inlet can be reduced through the inclined arrangement, the overall height of the tower is reduced, and the manufacturing cost and the construction difficulty are reduced.
The invention has the further improvement that under the condition that the area of the finned tube radiator is not changed, the height of the air inlet can be reduced by h (1-sin alpha) when the finned tube radiator is arranged by inclining an alpha angle.
The invention has at least the following beneficial technical effects:
the finned tube radiator is obliquely arranged according to a preset angle, so that the area of the finned tube radiator can be increased under the condition that the height of an air inlet of the indirect air cooling tower and the overall structure size of a tower body are not changed; or under the condition that the area of the total finned tube radiator is not changed, the height of the air inlet can be reduced, the tower height is reduced, and the manufacturing cost and the construction difficulty of the indirect air cooling tower are reduced. The micro-inclination angle of the finned tube radiator has a minimum value, the minimum value can be directly solved through a function, the calculation and programming are easy, and the micro-inclination angle of the finned tube radiator of the indirect air cooling tower is selected within the range of 90 degrees to the minimum value. The implementation of the method for arranging the tube bundles in a slightly inclined manner, which can increase the heat exchange area of the indirect air cooling tower, has important significance in optimizing the structural design of the indirect air cooling tower.
Drawings
FIG. 1 is a schematic diagram of a system for increasing the heat exchange area of an indirect air cooling tower by using a method of arranging tube bundles in a slightly inclined manner.
Fig. 2 is a plan view of the air inlet.
Description of reference numerals:
1. the system comprises a condenser, 2, a circulating water pump inlet valve, 3, a circulating water pump, 4, a circulating water pump outlet valve, 5, an indirect air cooling tower ventilating duct and 6, and an indirect air cooling tower finned tube radiator.
Detailed Description
The following description is of the preferred embodiments of the present invention, and it is to be understood that the preferred embodiments described herein are merely illustrative and explanatory of the invention, and are not restrictive thereof.
As shown in fig. 1 and 2, the system applied in the method for arranging the tube bundles in a slight inclination manner capable of increasing the heat exchange area of the indirect air cooling tower provided by the invention comprises an indirect air cooling tower ventilating duct 5 and an indirect air cooling tower finned tube radiator 6 arranged at the bottom of the indirect air cooling tower ventilating duct 5, wherein a circulating water outlet of the indirect air cooling tower finned tube radiator 6 is connected to a circulating water inlet of a condenser 1, and a circulating water outlet of the condenser 1 is connected to the circulating water inlet of the indirect air cooling tower finned tube radiator 6 sequentially through a circulating water pump inlet valve 2, a circulating water pump 3 and a circulating water pump outlet valve 4.
According to the method for arranging the tube bundles in the slightly inclined mode, which is capable of increasing the heat exchange area of the indirect air cooling tower, the finned tube radiators of the indirect air cooling tower are arranged in the inclined mode according to the preset angle, and the area of the finned tube radiators can be increased under the condition that the height of the air inlet of the indirect air cooling tower and the overall structure size of the indirect air cooling tower are not changed. As shown in FIG. 1, assuming that the area of the original vertically arranged finned tube radiator is S, the area of the finned tube radiator that can be arranged when arranged at an oblique angle α is S1. The calculation formula is shown in formula (1).
Wherein, the inclination angle alpha of the finned tube radiator of the indirect air cooling tower has a minimum value alphaminThe calculation formula is shown in formula (2).
Wherein:
h: the height of an air inlet of the indirect air cooling tower;
c: the perimeter of the air inlet.
The value of the inclination angle alpha of the finned tube radiator of the indirect air cooling tower is alphamin～90°。
Under the condition that the area S of the finned tube radiator is unchanged, the height of an air inlet is h when the radiator is vertically arranged, and when the inclination angle alpha of the finned tube radiator of the indirect air cooling tower is arranged, the height of the air inlet is h sin alpha, 0< sin alpha is less than or equal to 1, so that h sin alpha is less than or equal to h.
Working example 1
The total area of a finned tube radiator of a steel structure indirect air cooling tower configured for a certain 600MW unit is 1567437m2The total number of the finned tube radiators is 1196, the height of the air inlet is 27.192m, and the diameter of the air inlet is 139.2 m.
The method for arranging the tube bundles in a slightly inclined mode is implemented, and the heat exchange area of the indirect air cooling tower can be increased. According to the basic size of the indirect air cooling tower, the circumference length C of the air inlet is 3.14 multiplied by 139.2 multiplied by 437.09 m. The minimum value of the angle of inclination alpha is
At most 90.
The inclination angle of the finned tube radiator of the existing indirect air cooling tower is 75 degrees.
Area of original indirect air cooling tower single fin tube radiator
When the finned tube radiator is slightly inclined by 75 degrees, the area of the single finned tube radiator is as follows
When the finned tube radiator is arranged by slightly inclining 75 degrees, the area for arranging the single finned tube radiator can be increased
The total area increase value of the indirect air cooling tower radiator is 46.23 × 1196 ═ 55293.36m2。
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A method for arranging a pipe bundle with a slight inclination capable of increasing the heat exchange area of an indirect air cooling tower is characterized in that a finned pipe radiator of the indirect air cooling tower is arranged in an inclined mode according to a preset angle, and the area of the finned pipe radiator is increased under the condition that the height of an air inlet of the indirect air cooling tower and the overall structure size of the indirect air cooling tower are not changed.
2. The method for arranging the tube bundles with slight inclination capable of increasing the heat exchange area of the indirect air cooling tower as claimed in claim 1, wherein the area of the original vertically arranged finned tube radiator is set as S, and the area of the finned tube radiator capable of being arranged when the finned tube radiator is arranged at the inclination angle alpha is set as S1The calculation formula is shown in formula (1):
3. the method for arranging the tube bundles with slight inclination capable of increasing the heat exchange area of the indirect air cooling tower as claimed in claim 2, wherein the inclination angle alpha of the finned tube radiator of the indirect air cooling tower has a minimum value alphaminThe calculation formula is shown as formula (2):
wherein:
h: the height of an air inlet of the indirect air cooling tower;
c: the perimeter of the air inlet.
4. The method for arranging the tube bundles with slight inclination capable of increasing the heat exchange area of the indirect air cooling tower as claimed in claim 1, wherein the inclination angle alpha of the finned tube radiator of the indirect air cooling tower is alphamin～90°。
5. The method for arranging the tube bundles with slight inclination capable of increasing the heat exchange area of the indirect air cooling tower as claimed in claims 1 and 2, wherein under the condition that the height of the air inlet is unchanged, the area for arranging the finned tube radiators can be increased when the finned tube radiators are arranged at the inclination angle of alpha
6. The method for arranging the tube bundles with the slightly inclined angle capable of increasing the heat exchange area of the indirect air cooling tower according to claim 1 is characterized in that under the condition that the area S of the finned tube radiator is not changed, the height of an air inlet is h when the radiator is vertically arranged, and when the inclination angle alpha of the finned tube radiator of the indirect air cooling tower is arranged, the height of the air inlet is h sin alpha, 0< sin alpha is less than or equal to 1, and h sin alpha is less than or equal to h.
7. The method for arranging the tube bundles with slight inclination capable of increasing the heat exchange area of the indirect air cooling tower as claimed in claim 5 is characterized in that under the condition that the area of the finned tube radiator is not changed, the height of the air inlet can be reduced through the inclined arrangement, the overall height of the tower is reduced, and the manufacturing cost and the construction difficulty are reduced.
8. The method for arranging the tube bundles with the slight inclination capable of increasing the heat exchange area of the indirect air cooling tower according to claim 5, wherein the height of the air inlet can be reduced by h (1-sin α) when the finned tube radiator is arranged at the inclination angle α under the condition that the area of the finned tube radiator is not changed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110513349.5A CN113048805A (en) | 2021-05-11 | 2021-05-11 | Pipe bundle micro-inclination arrangement method capable of increasing heat exchange area of indirect air cooling tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110513349.5A CN113048805A (en) | 2021-05-11 | 2021-05-11 | Pipe bundle micro-inclination arrangement method capable of increasing heat exchange area of indirect air cooling tower |
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| CN113048805A true CN113048805A (en) | 2021-06-29 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5927097A (en) * | 1995-02-20 | 1999-07-27 | F F Seeley Nominees Pty Ltd | Evaporative cooler with improved contra flow heat exchanger |
| CN102353277A (en) * | 2011-08-01 | 2012-02-15 | 山西省电力勘测设计院 | Indirect air cooling tower with radiators in horizontal and vertical arrangement and parameter determination method thereof |
| CN104697356A (en) * | 2015-03-31 | 2015-06-10 | 山东大学 | Indirect cooling tower with cooling triangles arranged obliquely |
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2021
- 2021-05-11 CN CN202110513349.5A patent/CN113048805A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5927097A (en) * | 1995-02-20 | 1999-07-27 | F F Seeley Nominees Pty Ltd | Evaporative cooler with improved contra flow heat exchanger |
| CN102353277A (en) * | 2011-08-01 | 2012-02-15 | 山西省电力勘测设计院 | Indirect air cooling tower with radiators in horizontal and vertical arrangement and parameter determination method thereof |
| CN104697356A (en) * | 2015-03-31 | 2015-06-10 | 山东大学 | Indirect cooling tower with cooling triangles arranged obliquely |
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Application publication date: 20210629 |