CN113375498B - Wet cooling tower core component arrangement method in wind direction stable area - Google Patents
Wet cooling tower core component arrangement method in wind direction stable area Download PDFInfo
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- CN113375498B CN113375498B CN202110790646.4A CN202110790646A CN113375498B CN 113375498 B CN113375498 B CN 113375498B CN 202110790646 A CN202110790646 A CN 202110790646A CN 113375498 B CN113375498 B CN 113375498B
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- cooling tower
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/10—Component parts of trickle coolers for feeding gas or vapour
Abstract
The invention discloses a method for arranging tower core components of a wet cooling tower in a wind direction stable area, which comprises the steps of dividing the cooling tower into a wind direction stable area and a wind-free area according to the local wind direction condition, carrying out grid encryption treatment on the wind direction stable area so as to more accurately simulate the process of a key cooling area, carrying out numerical simulation on a plurality of groups of parameters, and determining the parameters of an optimal solution to arrange the cooling tower.
Description
Technical Field
The invention belongs to the field of energy conservation and consumption reduction of coal-fired units, and particularly relates to a method for arranging tower core components of a wet cooling tower in a region with stable wind direction.
Background
The cooling tower is used as important equipment of a power plant and is mainly used for cooling circulating water, and the cooling effect directly influences the vacuum of a unit so as to influence the economy of the whole power plant. Most of the arrangement of the tower core components of the cooling tower is designed according to standardization, the customized design is difficult to adopt the appropriate local climatic conditions and geographical environment, the design is not reasonable enough, and the structural construction of the cooling tower and the initial investment of the tower core component materials are increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for arranging wet cooling tower core components in a region with stable wind direction, so as to solve the problem that the arrangement of components in a cooling tower in the cooling tower is difficult to customize in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method for arranging tower core components of a wet cooling tower in a wind direction stable area, which comprises the steps of dividing the cooling tower into a wind direction stable area and a wind-free area according to the local wind direction condition, carrying out grid encryption treatment on the wind direction stable area so as to more accurately simulate the process of a key cooling area, carrying out numerical simulation on a plurality of groups of parameters, and determining the parameters of an optimal solution to arrange the cooling tower. The method of the invention can be customized and designed according to local climatic conditions, the design is more reasonable, and the structural construction of the cooling tower and the initial investment of the tower core component material are reduced. The heat exchange volume of the filler is increased on the windward side, water distribution is enhanced, and the cooling effect of the windward side is enhanced. Arranging small-distance fillers on the periphery of the windward side, and increasing the filler height of the peripheral area; the density of the spraying device is increased on the windward side as a whole, and the water distribution effect of the windward side is strengthened. Meanwhile, for the area easy to freeze, the peripheral water curtain flow is increased on the windward side, and the risk of freezing is reduced. The design mode of 'one tower and one strategy' is adopted, so that the investment cost is reduced, and the cooling effect of the cooling tower is improved.
Furthermore, small-distance fillers are arranged on the periphery of the windward side, and the filler height of the peripheral area is increased; the density of the spraying device is increased on the windward side as a whole, and the water distribution effect of the windward side is strengthened.
Drawings
FIG. 1 is a diagram of a cooling tower system of the present invention;
FIG. 2 is a view of a cooling tower fill area A-A of the present invention;
FIG. 3 is a view of the spray area B-B of the cooling tower of the present invention;
wherein: 1. an inlet butterfly valve of the circulating water pump; 2. a water circulating pump; 3. a filler region; 4. a spraying area; 5. a wet cooling tower; 6. stabilizing the wind direction area; 7. and a windless area.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention aims to provide a method for arranging tower core parts of a wet cooling tower in a region with stable wind direction, which adopts a design mode of 'one tower and one strategy' to reduce investment cost and improve the cooling effect of the cooling tower.
In partial regions, the wind direction is relatively fixed all the year round, the arrangement mode and the quantity of the tower core parts are guided to be selected through the numerical simulation and the calculation result in the early stage, the heat exchange volume of the filler is mainly considered to be increased on the windward side, the water distribution is strengthened, and the cooling effect of the windward side is enhanced.
Specifically, as shown in fig. 1, the wet cooling tower is configured such that the circulating cooling water in the wet cooling tower 5 enters the circulating water pump 2 via the inlet butterfly valve 1 of the circulating water pump, is pressurized and then enters the circulating water main pipe, and enters the wet cooling tower 5 via the circulating water upper tower water pipe. The wet cooling tower 5 is provided with a packing region 3, and a spray region 4 is provided above the packing region 3. After entering the vertical shaft of the wet cooling tower 5, the circulating cooling water is distributed into the spraying area 4 of each wet cooling tower through a water distribution pipe and then splashed into the filling area 3 of the wet cooling tower for cooling, and the lower part of the filling area 3 of the wet cooling tower is a rain area.
Referring to fig. 2 and 3, the whole embodied cooling tower 5 is divided into a stable wind direction area 6 and a no-wind area 7 by two vertical planes according to local wind directions; both vertical planes pass through the vertical centerline of the cooling tower 5, as shown by the dashed lines in fig. 2 and 3. Based on the above, the establishment of the mathematical model is started, and the method specifically comprises the following steps:
step 1, establishing a three-dimensional model of a wet cooling tower (5) by using three-dimensional model software;
and 2, carrying out gridding treatment on the three-dimensional model, namely carrying out cooper type local encryption treatment on a filler region, a spraying region 4 and a rain region which transfer heat most in a stable wind direction region (6), wherein the requirement on the accuracy of the grid is low due to no heat and mass transfer calculation in an inlet extension region, the influence on the calculation of the tower outlet water temperature of the wet cooling tower 5 is small, and the condition and the method for actually drawing the grid are synthesized, so that a mixed grid with the grid type of Tet/Hybrid is adopted, the calculation condition and the economy are considered, the grid number of the whole region is finally determined to be 80 thousands, and the numerical verification is carried out on the grid.
And 3, selecting different filler intervals, different filler heights and different spray device densities for the wind direction stabilizing area 6, selecting conventional and unchanged filler intervals, filler heights and spray device densities for the windless area 7, performing simulation on a wind field and a temperature field on the whole wet cooling tower 5, and selecting the group with the lowest tower water temperature and the smallest cooling area of the wet cooling tower 5 as the optimal selection according to a simulation result.
And 4, selecting a group with the lowest tower outlet water temperature and the smallest cooling tower area after numerical simulation as an optimal solution, inputting the optimal solution into analog simulation software for simulation to obtain the tower outlet water temperature, simultaneously bringing parameters of the group into the numerical simulation software Matlab for iterative calculation verification, and when the difference between the tower outlet water temperature calculated by the numerical simulation and the tower outlet water temperature of the simulation software is more than 5%, continuously modifying the model for numerical simulation until the deviation is less than 5%, and determining the optimal arrangement mode. And arranging the filler spacing, the filler height and the density of the spraying device in the wind direction stabilizing area 6 according to parameters in the optimal solution group.
The specific mode is that small-distance fillers are arranged on the periphery of the windward side, and the filler height of the peripheral area is increased; the density of the spraying device is increased on the windward side as a whole, and the water distribution effect of the windward side is strengthened.
Examples
When the cooling tower is designed, after conventional design analysis is carried out, the wind speed and the wind direction of nearly ten years are researched and analyzed, and if the wind direction is fixed, different tower core components can be arranged in the region with the fixed wind direction.
As can be seen from the A-A and B-B views of the cooling tower filler, the filler arrangement mode and the spraying device arrangement mode of the wind direction stabilizing area 6 are adopted in the wind direction stabilizing area 6, the heat exchange volume of the filler area 3 is increased on the windward side, water distribution is strengthened, and the cooling effect of the windward side is enhanced. Arranging fillers with normal spacing (the spacing is 30mm) in the no-wind area 7, arranging small-spacing fillers (the spacing is 26mm) on the periphery of the wind direction stabilizing area 6, and increasing the height of the fillers in the wind direction stabilizing area 6, wherein the height of the fillers in the wind direction stabilizing area 6 is about 1.25 times of the height of the fillers in the no-wind area 7; the density of the spraying devices 4 is integrally increased in the wind direction stabilizing area 6, the density of the spraying devices arranged in the wind direction stabilizing area 6 is about 1.2 times that of the wind-free area 7, and the water distribution effect of the wind direction stabilizing area 6 is enhanced. The specific windward region fill level and spray density were confirmed by numerical simulations and calculations.
As can be seen from fig. 2, the packing density in the steady wind direction region 6 is greater than that in the no-wind region 7, and as can be seen from fig. 3, the number of sprinklers provided in the steady wind direction region 6 is greater than that in the no-wind region 7.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for arranging wet cooling tower core components in a wind direction stable area is characterized by comprising the following steps;
step 1, establishing a three-dimensional model of a cooling tower by using three-dimensional model software; dividing the wet cooling tower (5) into a stable wind direction area (6) and a no-wind area (7) along the vertical direction according to the local wind direction;
the filler spacing, filler height and spray device density of the windless area (7) are in a conventional arrangement mode;
the filler spacing of the calm zone (7) is larger than that of the stable wind direction zone (6), the filler height of the calm zone (7) is smaller than that of the stable wind direction zone (6), and the density of the spray devices in the calm zone (7) is smaller than that of the spray devices in the stable wind direction zone (6);
small-distance fillers are arranged on the periphery of the windward side, the filler height of the peripheral area is increased, and the water curtain flow of the periphery is increased by the windward side;
step 2, gridding the three-dimensional model, and partially encrypting a filler area 3 in a wind direction stabilizing area (6), wherein the grid is a dry-wet mixed type grid;
step 3, inputting a plurality of groups of parameters, wherein each group of parameters comprises the filler distance and the filler height of the filler area 3 and the spraying device density of the spraying area 4, and performing simulation on a wind field and a temperature field of the whole wet cooling tower (5);
and 4, selecting a group with the lowest water temperature of the outlet tower and the smallest area of the wet cooling tower (5) after analog simulation as an optimal solution, and arranging the filler spacing, the filler height and the density of the spraying device of the wind direction stabilizing area (6) according to parameters in the group of the optimal solution.
2. The method for arranging the tower core components of the wet cooling tower in the wind direction stabilization area according to claim 1, wherein the three-dimensional model software is fluent software.
3. The method for arranging the tower core components of the wet cooling tower in the windward stabilization area according to claim 1, wherein in the step 2, the number of all grids is 80 ten thousand.
4. The method for arranging the tower core components of the wet cooling tower in the area with the stable wind direction as claimed in claim 1, wherein after the step 4, parameters in the group of optimal solution are input into numerical calculation software for numerical simulation, if the deviation between the numerical calculated tower outlet water temperature and the simulated tower outlet water temperature is more than 5%, the parameters are continuously modified for simulation until the deviation between the numerical calculated tower outlet water temperature and the simulated tower outlet water temperature is less than 5%.
5. Method for arranging wet cooling tower core components in areas with stable wind direction according to any of claims 1-4, wherein the filler height of the areas with stable wind direction (6) is 1.25 times the filler height of the areas without wind (7).
6. The method for arranging the tower core components of the wet cooling tower in the area with stable wind direction according to any one of the claims 1 to 4, wherein the spray device density of the area (6) with stable wind direction is 1.2 times of the spray device density of the area (7) without wind.
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| CN110686552B (en) * | 2019-09-30 | 2021-11-09 | 上海电气集团股份有限公司 | Cooling tower filler arrangement optimization method based on cooling latent power |
| CN113074574B (en) * | 2021-04-29 | 2023-01-24 | 西安西热节能技术有限公司 | Wet cooling tower filler arrangement structure based on main wind direction |
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| RU2218532C2 (en) * | 2001-12-11 | 2003-12-10 | ООО "Издательство "SOS" | Fan for cooling tower |
| CN202420221U (en) * | 2011-11-30 | 2012-09-05 | 华北电力大学 | Ambient wind field flow guide device outside vertically arranged air-cooled radiator |
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