Multi-layer collecting equipment for circulating cooling water

Abstract

The utility model provides multi-layer collecting equipment for circulating cooling water. The multi-layer collecting equipment comprises a supporting base, a middle supporting structure, a plurality of collecting covers and a drainage system, the supporting base is provided with a first channel for water vapor to pass through. The collecting cover is installed on the middle supporting structure, the collecting cover surrounds the middle supporting structure to form a second channel allowing water vapor to pass through, a collecting cavity is formed in the collecting cover, the bottom of the collecting cavity is provided with an air inlet allowing the water vapor to pass through and a water collecting groove, and the drainage system is communicated with the water collecting groove; and the inner diameters of the second channels of the plurality of collecting covers are sequentially reduced from bottom to top. According to the multi-layer collecting device for the circulating cooling water, water vapor is collected through the multi-layer collecting cover, a large amount of cooling water can be effectively recycled, cost is saved, and meanwhile the influence on the surrounding environment of a power station can be reduced; the original working process of the cooling tower of the power station is not affected, and interference and equipment risk hidden danger cannot be brought to stable operation of the power station.

Description

Technical Field

[0001] The utility model relates to the technical field of power stations, in particular to a multi-layer collection device for circulating cooling water. Background Art

[0002] The circulating cooling water of the power station is a key system in the power generation process. After the steam (about 550-650℃) works in the turbine, it needs cooling water to cool the exhaust steam (about 45-90℃) through the condenser to near room temperature (about 25-35℃) for recycling. During the cooling process, under the conditions of ambient temperature of 30℃ and relative humidity of 78%, the amount of circulating water required for heat exchange in the cooling tower is 5675 tons / day, and the loss of circulating water to the atmosphere by evaporation reaches 76 tons / day (about 1-2%).

[0003] my country is a major electricity producer. In order to save water, some power stations built in arid areas mostly use air cooling (building air-cooling islands) to cool the exhaust steam of steam turbines. However, the construction cost of air-cooling islands is high and they are greatly affected by ambient temperature, dust, etc., and the cooling effect is not as good as water cooling.

[0004] Therefore, in areas with relatively sufficient water resources, the circulating cooling water system of power stations still uses reinforced concrete cooling towers to cool water from rivers, lakes, seas or directly use municipal tap water. Although there is an evaporation rate of nearly 1%, after comprehensively considering various benefits, we have to accept the practice of directly discharging it into the atmosphere. The heat carried by water vapor directly evaporating into the atmosphere will affect the changes in local environmental temperature in the surrounding areas, interfere with the formation of atmospheric circulation and convection, and then affect local meteorology and hydrology, bringing impacts to industrial and agricultural production. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies in the prior art and provide a multi-layer collection device for circulating cooling water.

[0006] One embodiment of the utility model provides a multi-layer collection device for circulating cooling water, comprising: a support base, an intermediate support structure and a plurality of collection covers;

[0007] The support base is arranged on a cooling tower of a power station, and a first channel for water vapor to pass through is arranged on the support base;

[0008] The intermediate support structure is disposed on the support base and extends upward from the support base;

[0009] The collecting hood is mounted on the intermediate supporting structure, and a plurality of the collecting hoods are arranged in sequence from bottom to top. The collecting hood surrounds the intermediate supporting structure to form a second channel for water vapor to pass through, a collecting chamber is formed in the collecting hood, and an air inlet and a water collecting tank for water vapor to pass through are arranged at the bottom of the collecting chamber, the air inlet is arranged around the second channel, and the water collecting tank is arranged around the air inlet;

[0010] The inner diameters of the second channels of the plurality of collecting covers decrease from bottom to top, the second channels of the collecting covers and the air inlets of the adjacent collecting covers located above at least partially overlap each other in the vertical projection direction, and the air inlet of the collecting covers located at the bottom is arranged corresponding to the position of the first channels;

[0011] The drainage system includes a plurality of drainage main pipes and a plurality of drainage branch pipes, the drainage branch pipes are connected to the water collecting tanks correspondingly, and the drainage main pipe is connected to the plurality of drainage branch pipes.

[0012] Compared with the prior art, the multi-layer collection device for circulating cooling water of the utility model collects water vapor through a multi-layer collection hood, and then recycles the water, which can effectively recycle a large amount of cooling water, save costs, and reduce the impact on the environment around the power station. In addition, it will not affect the original working process of the power station cooling tower, and will not cause interference to the stable operation of the power station and cause equipment risks.

[0013] In some optional embodiments, a first curved surface is formed on the top of the collecting chamber, the first curved surface is correspondingly located above the water collecting tank, and the first curved surface gradually extends downward in a direction away from the air inlet.

[0014] In some optional embodiments, a second curved surface is formed on the top of the collecting chamber, the second curved surface is correspondingly located above the air inlet, and the second curved surface gradually extends downward in a direction away from the water collecting tank.

[0015] In some optional embodiments, a plurality of drainage holes are provided at the bottom of the water collecting tank, and the drainage holes are correspondingly connected to the drainage branch pipes.

[0016] In some optional embodiments, the plurality of drainage holes are evenly arranged around the intermediate support structure, and adjacent drainage holes are spaced 90° apart from each other in a circumferential direction relative to the intermediate support structure.

[0017] In some optional embodiments, the sizes of the plurality of collecting hoods are reduced in sequence from bottom to top according to a preset ratio, and the size of the collecting hood is 0.5-0.8 times that of the adjacent collecting hood located below.

[0018] In some optional embodiments, a plurality of spiral water guide strips are arranged on the top of the collection chamber, and the spiral water guide strips are located above the water collecting trough.

[0019] In some optional embodiments, a rain cover is provided on the top of the intermediate support structure, and the rain cover is arranged above the second channel of the collecting cover located at the top and covers the second channel of the collecting cover located at the top.

[0020] In some optional embodiments, there is a preset spacing between adjacent collecting hoods in the height direction.

[0021] In some optional embodiments, the intermediate support structure includes support columns and a plurality of frames, the support columns are arranged on the support base, the collection cover is installed on the support columns through the frames, and the frames are located in the second channel.

[0022] In summary, the advantages and novelties of the utility model that bring practical benefits are:

[0023] 1. At present, domestic power stations generally allow the circulating water of the cooling tower to evaporate naturally and discharge it into the atmosphere. Therefore, the utility model proposes for the first time to recycle part of the evaporated circulating water. Moreover, the device has a simple appearance, does not require special materials, and has a low manufacturing cost.

[0024] 2. The utility model utilizes the characteristics of plants in nature and bionic thinking, and uses an appearance similar to morning glory. The size of the actual structure is calculated according to mathematical methods, so that water vapor adheres to the inner surface of the collection cover when evaporating upward, and finally gathers into water in the water collection tank, so as to collect and utilize the water.

[0025] 3. The utility model adopts a multi-layer design, which does not completely close the evaporation channel of cooling water, but collects the water vapor that has evaporated from the top of the cooling tower at the upper part of the cooling tower, so it does not interfere with the original work flow of the cooling tower, and will not interfere with the stable operation of the power station and bring equipment risks. In addition, part of the water vapor that could not be recovered is recovered, which means that the heat discharged into the atmosphere is reduced, and the impact on the environment is reduced accordingly.

[0026] 4. The water vapor from the cooling tower that could not be recovered originally is recovered by the device designed by the utility model. Even if only a part of the original evaporation of 76 tons / hour (calculated as 1%) can be recovered per hour, the power station is generally in continuous operation, so the amount of water recovered in a year can still reach 5472 tons (calculated based on 24 hours a day and 300 days of power generation per year). The value of this part of the water source can completely offset the cost of building the device of the utility model.

[0027] In order to more clearly understand the present invention, the specific implementation of the present invention will be described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of a multi-layer collection device for circulating cooling water according to an embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a multi-layer collection device for circulating cooling water according to an embodiment of the utility model when it is installed on a cooling tower of a power station;

[0030] Figure 3 A cross-sectional view of a collecting hood according to an embodiment of the utility model;

[0031] Figure 4 This is a schematic structural diagram of the top of a collecting hood according to an embodiment of the utility model;

[0032] Figure 5 This is a design principle diagram of a collection hood according to an embodiment of the utility model.

[0033] Description of reference numerals:

[0034] 10. Support base; 11. First channel; 20. Intermediate support structure; 21. Support column; 22. Frame; 23. Rain cover; 30. Collecting cover; 31. Second channel; 32. Collecting chamber; 321. First curved surface; 322. Second curved surface; 33. Air inlet; 34. Water collecting trough; 35. Spiral water guide strip; 36. Drain hole; 40. Drain system; 41. Drain branch pipe; 42. Drain main pipe. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. In the description of the utility model, unless otherwise specified, "multiple" means 2 or more, and "several" means 1 or more. In addition, unless otherwise specified, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the description of the present invention, the description with reference to the terms "one embodiment", "some optional implementations" or "some optional embodiments" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0039] The utility model installs a multi-layer collection device at the outlet of the induced draft fan at the top of the cooling tower of the power station. The overall shape of the device is like several trumpet-shaped morning glories strung together. Each layer will properly block the water vapor discharged into the air, and then "guide" it to flow together under the shape of the device itself, and then collect it for recycling. This recycling process does not affect the original power generation process of the power station, will not cause power grid fluctuations, and will not interfere with power grid safety.

[0040] See also Figure 1 An embodiment of the utility model provides a multi-layer collection device for circulating cooling water, including: a support base 10, an intermediate support structure 20, a plurality of collection covers 30 and a drainage pipe system 40.

[0041] See also Figures 2 to 4A support base 10 is arranged on a cooling tower of a power station, and a first channel 11 for water vapor to pass through is arranged on the support base 10; an intermediate support structure 20 is arranged on the support base 10 and extends upward from the support base 10; a collecting hood 30 is installed on the intermediate support structure 20, and a plurality of collecting hoods 30 are arranged in sequence from bottom to top, and the collecting hood 30 surrounds the intermediate support structure 20 to form a second channel 31 for water vapor to pass through, and a collecting chamber 32 is formed in the collecting hood 30, and an air inlet 33 and a water collecting tank 34 for water vapor to pass through are arranged at the bottom of the collecting chamber 32, and the air inlet 33 is arranged around the second channel 31, and the water collecting tank 34 is arranged around the air inlet 33.

[0042] The inner diameters of the second channels 31 of the plurality of collecting hoods 30 decrease from bottom to top, the second channels 31 of the collecting hood 30 and the air inlet 33 of the adjacent collecting hood 30 located above at least partially overlap each other in the vertical projection direction, and the air inlet 33 of the lowest collecting hood 30 is arranged corresponding to the position of the first channel 11. The drainage system 40 includes a plurality of drainage main pipes 42 and a plurality of drainage branch pipes 41, the drainage branch pipes 41 are connected to the water collecting tank 34 correspondingly, and the drainage main pipe 42 is connected to the plurality of drainage branch pipes 41.

[0043] After the unit of the power station is started, the cooling water flows driven by the water pump. After exchanging heat with the exhaust steam of the steam turbine, the cooling water flows into the cooling tower for cooling. Part of the water will evaporate into the air during the cooling process. The evaporated water vapor is discharged to the top of the cooling tower under the drive of the induced draft fan, and then passes through the induced draft fan with the air flow. When the water vapor at the top of the cooling tower evaporates with the air flow, the water vapor rises after passing through the first channel 11 of the support base 10, and then part of the water vapor enters the water inlet of the lowest collecting cover 30 and contacts the top of the collecting chamber 32, and then condenses on the inner wall of the collecting chamber 32 and collects in the water collecting tank 34, while the other water vapor passes through the second channel 31 of the lowest collecting cover 30, and then another part of the water vapor enters the water inlet of the second collecting cover 30 from bottom to top, and the cycle continues like this. The water vapor gradually enters each collecting cover 30, and then condenses and collects in the water collecting tank 34, thereby achieving the effect of collecting water vapor.

[0044] See also Figure 3 In some optional embodiments, a first curved surface 321 is formed on the top of the collection chamber 32. The first curved surface 321 is located above the water collecting tank 34. The first curved surface 321 gradually extends downward in a direction away from the air inlet 33. After the water vapor adheres to the inner wall of the collection chamber 32, it condenses into water, and then flows down along the first curved surface 321 until it is collected in the water collecting tank 34. The first curved surface 321 is convenient for collecting condensed water.

[0045] See also Figure 3In some optional embodiments, a plurality of spiral water guide strips 35 are arranged on the top of the collection chamber 32. The spiral water guide strips 35 are located above the water collecting trough 34. The spiral water guide strips 35 are conducive to promoting water vapor adhesion, condensation and diversion.

[0046] See also Figure 3 In some optional embodiments, a second curved surface 322 is formed on the top of the collecting chamber 32. The second curved surface 322 is located above the air inlet 33. The second curved surface 322 gradually extends downward in a direction away from the water collecting tank 34. After the water vapor enters the air inlet 33, the second curved surface 322 helps guide the water vapor to flow above the water collecting tank 34, thereby facilitating the water vapor to fall into the water collecting tank 34 after condensation.

[0047] In some optional embodiments, a plurality of drainage holes 36 are provided at the bottom of the water collection tank 34, and the drainage holes 36 are connected to the drain main pipe 38 through a drain branch pipe 37. Each drainage hole 36 is connected to a drain branch pipe 37, and the drain branch pipe 37 transports water to the drain main pipe 38, and then the drain main pipe 38 transports the water to a suitable location for easy recycling.

[0048] In some optional embodiments, a plurality of drainage holes 36 are evenly arranged around the intermediate support structure 20, and adjacent drainage holes 36 are spaced 90° apart from each other in the circumferential direction relative to the intermediate support structure 20. The evenly arranged drainage holes 36 facilitate guiding the water in the trough 34 to flow to the drain branch 37, thereby preventing water from accumulating in the trough 34.

[0049] In some optional embodiments, the sizes of the multiple collection hoods 30 are reduced from bottom to top in accordance with a preset ratio, and the size of the collection hood 30 is 0.5-0.8 times that of the adjacent collection hood 30 located below. The collection hoods 30 that are reduced from bottom to top can effectively collect part of the water vapor in sequence, meet the requirements of incomplete closure, and complete water recovery without interfering with the operation of the cooling tower.

[0050] In some optional embodiments, a rain cover 23 is provided on the top of the intermediate support structure 20, and the rain cover 23 is arranged above the second channel 31 of the uppermost collecting cover 30, and covers the second channel 31 of the uppermost collecting cover 30. The rain cover 23 prevents the turbulent airflow caused by the backblowing and sideblowing of the surrounding airflow from interfering with the upward evaporation process of the water vapor in the cooling tower, thereby ensuring the collection effect.

[0051] In some optional embodiments, there is a preset spacing between adjacent collecting hoods 30 in the height direction, so as to facilitate gas circulation and avoid affecting the airflow of the induced draft fan of the cooling tower.

[0052] See also Figure 4The specific structure of the intermediate support structure 20 can be designed according to actual needs. For example, in some optional embodiments, the intermediate support structure 20 includes a support column 21 and a plurality of frames 22. The support column 21 is arranged on the support base 10. The collection cover 30 is installed on the support column 21 through the frame 22. The frame 22 is located in the second channel 31 and connected to the inner wall of the second channel 31. The intermediate support structure 20 adopts a hollow frame structure to facilitate airflow to drive water vapor through the second channel 31.

[0053] The following is an explanation of the implementation method of the device in actual use: a support base 10 is installed at the outlet of the induced draft fan at the top of the cooling tower, and a support column 21 is fixed at the center of the first channel 11 of the support base 10. The size of the support column 21 is Φ = 168-273 mm, and the wall thickness δ = 10-22 mm. The support column 21 can be made of a stainless steel pipe. The support column 21 serves as the main support frame 22 of the entire device, which is convenient for fixing other components of the device. The collection cover 30 of the device is shaped like a morning glory.

[0054] See also Figure 5 The production and outer dimensions of the shape of the collecting hood 30 can be understood as follows: on the longitudinal section of the collecting hood 30, a vertical straight line segment h with a length of 1-3 meters is made at the trumpet-shaped "flower handle" formed by the collecting hood 30, and a circular arc A with a diameter of 4-7 meters is made with the top point of the straight line segment h as the tangent point. The semicircle A is tangent to the straight line segment h, and an arc B inscribed in the arc A is made at the other end of the arc A. The diameter corresponding to the arc B is exactly half of the diameter A corresponding to the arc A. The three line segments of the straight line segment h, the arc A, and the arc B form a multi-line segment. This multi-line segment rotates along the horizontal plane to form a three-dimensional structure. Its longitudinal cross-sectional shape is like a cut mushroom. This is the shape of the collecting hood 30 obtained through mathematical calculations.

[0055] The diameter of the first channel 11 of the lowest collecting hood 30 is R=5-14 meters, and the inner wall of the first channel 11 is welded and fixed to the supporting column 21 through a frame 22 composed of three stainless steel supporting angle steels.

[0056] A plurality of spiral water guide strips 35 are welded on the top of the collecting chamber 32 of the collecting cover 30. The spiral water guide strips 35 are spring-like stainless steel wires with a diameter of 1-5 mm and a length of 20-140 cm. Of course, the size and quantity of the stainless steel wires can be selected according to actual conditions. The stainless steel wires serve as carriers to absorb small droplets of water vapor, which facilitates the guidance of water flow to drip into the water collection tank 34. A plurality of drainage holes 36 with a diameter of Φ=40-90 mm are drilled in the water collection tank 34. Generally, a drainage hole 36 is opened every 90° on the bottom circumference of the water collection tank 34. Of course, the specific number and size of the drainage holes 36 can be selected according to actual conditions. Then, each drainage hole 36 is welded with a drainage branch pipe 37 made of stainless steel of the same size, and the drainage branch pipe 37 is connected to the drainage main pipe 38.

[0057] The shape design of each collection hood 30 is exactly the same, except that the size of each collection hood 30 is proportionally reduced from bottom to top. Generally, the collection hood 30 located at the top is 0.5-0.8 times smaller than the adjacent collection hood 30 below. The collection hoods 30 adjacent to each other are 3-6 meters apart in the height direction. Finally, a straw hat-shaped rain cover 23 is welded on the top of the stainless steel support column 21 of the device. The isosceles triangle formed by the longitudinal section of the rain cover 23 has a height of 0.8-1.5 meters and a base length of 1-2.8 meters.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer collection device for circulating cooling water, characterized in that: include: Support base, intermediate support structure, multiple collection hoods and drainage system; The support base is arranged on a cooling tower of a power station, and a first channel for water vapor to pass through is arranged on the support base; The intermediate support structure is disposed on the support base and extends upward from the support base; The collecting hood is mounted on the intermediate supporting structure, and a plurality of the collecting hoods are arranged in sequence from bottom to top. The collecting hood surrounds the intermediate supporting structure to form a second channel for water vapor to pass through. A collecting cavity is formed in the collecting hood. An air inlet and a water collecting tank for water vapor to pass through are arranged at the bottom of the collecting cavity. The air inlet is arranged around the second channel, and the water collecting tank is arranged around the air inlet. The inner diameters of the second channels of the plurality of collecting covers decrease from bottom to top, the second channels of the collecting covers and the air inlets of the adjacent collecting covers located above at least partially overlap each other in the vertical projection direction, and the air inlet of the collecting covers located at the bottom is arranged corresponding to the position of the first channels; The drainage system includes a plurality of drainage main pipes and a plurality of drainage branch pipes, the drainage branch pipes are connected to the water collecting tanks correspondingly, and the drainage main pipe is connected to the plurality of drainage branch pipes.

2. A multi-layer collection device for circulating cooling water according to claim 1, characterized in that: A first curved surface is formed on the top of the collecting chamber. The first curved surface is correspondingly located above the water collecting tank, and the first curved surface gradually extends downward in a direction away from the air inlet.

3. A multi-layer collection device for circulating cooling water according to claim 1, characterized in that: A second curved surface is formed on the top of the collecting chamber. The second curved surface is correspondingly located above the air inlet, and the second curved surface gradually extends downward in a direction away from the water collecting tank.

4. A multi-layer collection device for circulating cooling water according to claim 1, characterized in that: A plurality of drainage holes are arranged at the bottom of the water collecting tank, and the drainage holes are connected to the drainage branch pipes accordingly.

5. A multi-layer collection device for circulating cooling water according to claim 4, characterized in that: The plurality of drainage holes are evenly arranged around the intermediate support structure, and adjacent drainage holes are spaced 90 degrees apart from each other in a circumferential direction relative to the intermediate support structure.

6. A multi-layer collection device for circulating cooling water according to claim 1, characterized in that: The sizes of the plurality of collecting covers are reduced in sequence from bottom to top according to a preset ratio, and the size of the collecting cover is 0.5-0.8 times that of the adjacent collecting cover located below.

7. A multi-layer collection device for circulating cooling water according to claim 1, characterized in that: A plurality of spiral water guide strips are arranged on the top of the collecting chamber, and the spiral water guide strips are located above the water collecting trough.

8. A multi-layer collection device for circulating cooling water according to any one of claims 1 to 7, characterized in that: A rain cover is provided on the top of the intermediate support structure. The rain cover is arranged above the second channel of the uppermost collecting cover and covers the second channel of the uppermost collecting cover.

9. A multi-layer collection device for circulating cooling water according to any one of claims 1 to 7, characterized in that: There is a preset distance between adjacent collecting covers in the height direction.

10. A multi-layer collection device for circulating cooling water according to any one of claims 1 to 7, characterized in that: The intermediate support structure includes support columns and a plurality of frames, wherein the support columns are arranged on the support base, and the collection cover is installed on the support columns through the frames, and the frames are located in the second channel.

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