Cooling tower circulating water system

Abstract

The utility model relates to a cooling tower circulating water system. The cooling tower circulating water system comprises at least one cooling tower set, a plurality of water inlet pipes and at least one water return pipe assembly, each cooling tower set comprises two cooling tower rows arranged in the first direction, each cooling tower row comprises at least one high-position water collecting cooling tower arranged in the second direction, and the first direction is perpendicular to the second direction. Each high-position water collection cooling tower is correspondingly connected with one water inlet pipe; each cooling tower group is correspondingly provided with a water return pipe assembly, each water return pipe assembly comprises a water return main pipe and an annular branch pipe, one end of the water return main pipe is used for recycling circulating hot water, the other end of the water return main pipe is connected with the annular branch pipe, and the annular branch pipe is connected with a plurality of corresponding water inlet pipes. According to the circulating water system of the cooling tower, the water distribution uniformity of the annular branch pipes arranged to be annular is higher, uniform water distribution is achieved, the operation condition of the high-position water collection cooling tower is improved, and the cooling performance and the power generation efficiency of a power plant are improved.

Description

Technical Field

[0001] The present application relates to the technical field of cooling systems, and in particular to a cooling tower circulating water system. Background Art

[0002] Cooling towers are important cold-end equipment in power plants. Their function is to discharge waste heat generated by thermal cycles into the atmosphere. The cooling efficiency of cooling towers has an important impact on the power generation efficiency of power plants.

[0003] In the related art, the cooling tower for the secondary circulating water of large generator sets usually adopts a traditional wet cooling tower or a high-level water collection cooling tower. The water supply process of the secondary circulation circulating water system is generally: circulating water pump suction tank → circulating water pump → circulating water supply pipe → condenser → circulating water return pipe → cooling tower → cooling tower sump / water collection tank → circulating water pump suction tank. The circulating water supply pipe and the circulating water return pipe serve as the link between the various equipment in the circulating water system. Their layout has a direct impact on the head optimization of the circulating water pump and the uniformity of the water distribution of the cooling tower. However, uneven water distribution of the cooling tower will lead to different water intake volumes of cooling towers with the same design parameters at different locations, which will in turn cause the actual working pressure and spray flow rate of the nozzles in each cooling tower to deviate from the design value. The water temperature of the cooling tower with insufficient water pressure or excessive water volume cannot meet the design requirements, which ultimately affects the power generation efficiency of the power plant. Utility Model Content

[0004] Based on this, it is necessary to provide a cooling tower circulating water system to address the problem of uneven water distribution in the cooling tower, which affects the power generation efficiency of the power plant.

[0005] A cooling tower circulating water system, comprising:

[0006] At least one cooling tower group, each cooling tower group includes two cooling tower columns arranged along a first direction, each cooling tower column includes at least one high-level water collection cooling tower arranged along a second direction, the first direction and the second direction are perpendicular to each other;

[0007] A plurality of water inlet pipes, each of the high-level water collection cooling towers is correspondingly connected to one of the water inlet pipes; and

[0008] At least one return pipe assembly, each cooling tower group is correspondingly provided with a return pipe assembly, each return pipe assembly comprises a return pipe and a ring branch pipe, one end of the return pipe is used to recover circulating hot water, and the other end is connected to the ring branch pipe, and the ring branch pipe is connected to the corresponding multiple water inlet pipes.

[0009] In some embodiments, the annular branch pipe is disposed in a lower area of ​​the corresponding cooling tower group, and the annular branch pipe is buried underground.

[0010] In some embodiments, the soil covering thickness of the top of the annular branch pipe is greater than or equal to 0.5 meters and less than or equal to 2 meters.

[0011] In some embodiments, the high-position water collection cooling tower includes a tower body, and the water inlet pipe is arranged inside the tower body of the corresponding high-position water collection cooling tower.

[0012] In some embodiments, the water inlet pipe is arranged in a weak wind area inside the tower body of the corresponding high-position water collection cooling tower.

[0013] In some embodiments, the high-level water collection cooling tower also includes a water distribution assembly, which is arranged inside the tower body and located on the side where the two rows of high-level water collection cooling towers are close to each other; the annular branch pipe is located below the water distribution assembly, one end of the water inlet pipe is connected to the annular branch pipe, and the other end is connected to the corresponding water distribution assembly of the high-level water collection cooling tower.

[0014] In some embodiments, the high-position water-collecting cooling tower is provided with an air inlet, and the air inlet is located on the side of the two rows of high-position water-collecting cooling towers that are away from each other.

[0015] In some embodiments, each of the cooling tower groups further includes a main water collecting tank, and the main water collecting tank is arranged between two rows of the high-level water collecting cooling towers in the first direction.

[0016] In some embodiments, the cooling tower circulating water system includes two cooling tower groups and two return water pipe assemblies arranged at intervals along the second direction; the cooling tower circulating water system also includes a circulating pump room arranged between the two cooling tower groups in the second direction, and a circulating water pump and a water absorption tank are provided in the circulating pump room.

[0017] In some embodiments, the cooling tower circulating water system further includes a communication pipe and a communication valve, wherein the communication pipe and the communication valve are connected between the two return pipe assemblies, and the communication pipe is passed through the bottom of the circulating pump room.

[0018] The above-mentioned cooling tower circulating water system creates feasible conditions for the annular branch pipes of the return pipe assembly to be arranged in a ring by adjusting the grouping method of the cooling tower group. Compared with branch-shaped water distribution, the water distribution uniformity of the annular branch pipes arranged in a ring is higher, which reduces the unevenness of water pressure and water volume distribution between high-position water cooling towers in different positions, achieves uniform water distribution, improves the operating conditions of high-position water cooling towers, and can effectively alleviate the problems of uneven water distribution of cooling towers and unstable water temperature out of the tower in related technologies, which affect the power generation efficiency of power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A top view of a cooling tower circulating water system according to some embodiments of the present application.

[0020] Figure 2 A partial cross-sectional view of a cooling tower circulating water system according to some embodiments of the present application.

[0021] Figure Number:

[0022] 100, cooling tower group; 10, cooling tower series; 1, high-position water collection cooling tower; 101, fan layer; 102, dewatering device layer; 103, water distribution layer; 104, packing layer; 105, water collection layer; 106, overhead layer; 11, tower body; 111, weak wind area; 112, air inlet; 12, water distribution assembly; 20, main water collection tank; 30, installation area;

[0023] 200, water inlet pipe; 300, water return pipe assembly; 301, water return main pipe; 302, annular branch pipe;

[0024] 400, circulating pump room; 401, circulating water pump; 402, water absorption tank;

[0025] 501. Communication pipeline; 502. Communication valve. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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 application.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. An element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and are not intended to be the only implementation method.

[0032] The cooling tower for the secondary circulating water of large generator sets usually adopts traditional wet cooling tower or high-level water collection cooling tower. The water supply process of the secondary circulation circulating water system is generally: circulating water pump suction tank → circulating water pump → circulating water supply pipe → condenser → circulating water return pipe → cooling tower → cooling tower water collection tank / water collection tank → circulating water pump suction tank.

[0033] Among them, the circulating water of the traditional wet cooling tower is fully heat-exchanged in the packing area and then falls freely to the semi-underground water collection tank below, and is pressurized and lifted to the condenser by the circulating water pump for circulating cooling. The traditional wet cooling tower group is usually divided into two rows, or arranged in parallel with a certain distance, or arranged back to back, to correspond to two conventional steam turbine generator sets. The circulating water required by the two generator sets is cooled by two rows of cooling towers respectively.

[0034] Two circulating water return pipes are used as the main water inlet pipes for each cooling tower. They are connected to the cooling tower water inlet branches in a branch-like manner and then connected to the cooling towers corresponding to the unit. However, when the circulating water return adopts branch-like water distribution, the water flow direction in the pipeline system is single. After being connected from the main plant, the water flows through the first cooling tower, the second cooling tower, etc. in sequence; therefore, the water flow from the outlet of the circulating water pump to the first cooling tower, the second cooling tower, etc. increases in sequence, the loss along the pipeline and the local loss increase in sequence, and the water pressure of the water inlet pipe of each cooling tower decreases in sequence, which leads to the decrease of the water outlet pressure and flow rate of the nozzles in each cooling tower in sequence. The water pressure and flow rate of the cooling tower closer to the main plant are higher than the design value, while the water pressure and flow rate of the cooling tower farther from the main plant do not reach the design value, resulting in the corresponding cooling tower outlet water temperature not meeting the condenser inlet water temperature requirement, which ultimately affects the power generation efficiency of the power plant.

[0035] A semi-underground water collection tank for collecting circulating water is installed under the traditional wet cooling tower. The buried circulating water return pipe cannot be arranged under the cooling tower in the cooling tower area to avoid the water collection tank and its structural foundation. It needs to be arranged along the outside of the cooling tower and the water collection tank under the tower. The circulating water pipeline is therefore longer, and the pipeline loss is greater under the same circulating water volume. A circulating water pump with a larger head is required, and the initial investment of the circulating water system, the power of the circulating water pump and the factory electricity will all increase accordingly.

[0036] The diameter of the circulating water pipes in large thermal power plants is relatively large, and it is not easy to inspect and maintain them when they are buried in the plant area. However, there are many types of pipelines in the plant area, and it is inevitable that the pipes will be crossed or overlapped. In order to reserve space for the water supply and drainage pipes, cable trenches, etc. in other plant areas, the top of the circulating water pipe is usually covered with soil of about 2 to 3 meters. The buried depth of the pipe is relatively large, and the trench excavation and backfilling required for laying the pipe is large. At the same time, the increase in the buried depth puts higher requirements on the wall thickness of the circulating water pipe, and increases the amount of steel plate used for the circulating water pipe. In addition, the circulating water pipes arranged outside the tower may hinder the layout of water supply and drainage pipes, cable trenches, etc. in other plant areas. The deep burial of the circulating water return pipe not only increases the cost of the project, but also brings inconvenience to the subsequent inspection and maintenance of the pipeline.

[0037] The circulating water pump room and forebay are arranged outside the cooling tower group. A liaison officer and a liaison valve are set between the two circulating water return pipes. The circulating water return pipe is arranged outside the traditional wet cooling tower. The inlet pipe of each cooling tower needs to be connected to the return pipe outside the cooling tower. The riser part of the cooling tower inlet pipe is directly arranged outside the cooling tower facade, which does not meet the aesthetic requirements of modern urbanized power plants.

[0038] Based on the traditional wet cooling tower, the high-position water collection cooling tower eliminates the water collection tank and installs a series of water collection devices at the bottom of the filler to achieve high-position interception. Compared with the traditional wet cooling tower, the high-position water collection cooling tower has a higher initial investment, but the high-position water collection cooling tower can make full use of the potential energy of the circulating water, can significantly reduce the head of the circulating water pump, and has a better overall cost throughout the life cycle. It also eliminates the noise generated by water droplets hitting the surface of the water collection tank, and has a significant noise reduction effect.

[0039] See also Figure 1 and Figure 2 , Figure 1 A top view of a cooling tower circulating water system in some embodiments of the present application is shown. Figure 2 A partial cross-sectional view of a cooling tower circulating water system in some embodiments of the present application is shown. The cooling tower circulating water system provided in the embodiment of the present application includes at least one cooling tower group 100, a plurality of water inlet pipes 200 and at least one return pipe assembly 300; each cooling tower group 100 includes two cooling tower rows 10 arranged along a first direction, each cooling tower row 10 includes at least one high-level water collection cooling tower 1 arranged along a second direction, and the first direction and the second direction are perpendicular to each other; each high-level water collection cooling tower 1 is connected to a corresponding water inlet pipe 200; each cooling tower group 100 is correspondingly provided with a return pipe assembly 300, each return pipe assembly 300 includes a return water main pipe 301 and an annular branch pipe 302, one end of the return water main pipe 301 is used to recover circulating hot water, and the other end is connected to the annular branch pipe 302, and the annular branch pipe 302 is connected to the corresponding plurality of water inlet pipes 200.

[0040] like Figure 1 and Figure 2 As shown in , the X direction is the first direction, the Y direction is the second direction, and the X direction and the Y direction are perpendicular to each other.

[0041] The cooling tower circulating water system can be used to cool the circulating hot water of the power plant generator set. The number of cooling tower groups 100 is at least one, for example, it can be one, two or three, etc., which is not limited here. Among them, the circulating water required for each generator set in the power plant can be cooled by a cooling tower group 100 respectively, that is, the number of cooling tower groups 100 can be the same as the number of generator sets in the power plant. The cooling tower group 100 is composed of a plurality of cooling towers arranged in combination, wherein a plurality of cooling towers are arranged in a second direction to form a cooling tower column 10, and then two cooling tower columns 10 are arranged in a first direction to form a cooling tower group 100. For example, the first direction can be the length direction of the cooling tower, and the second direction can be the width direction of the cooling tower.

[0042] The cooling tower may be a high-level water collection cooling tower 1, each of which is connected to an inlet pipe 200, and multiple inlet pipes 200 are connected to the same annular branch pipe 302, the annular branch pipe 302 is connected to a return water main pipe 301, and the return water main pipe 301 is connected to the condenser outlet of the generator set corresponding to the cooling tower group 100. The circulating water carrying waste heat output by the condenser of the generator set is transported into the high-level water collection cooling tower 1 via the return water main pipe 301, the annular branch pipe 302 and the inlet pipe 200, so as to recover the circulating hot water for cooling, and the circulating water cooled by the high-level water collection cooling tower 1 is transported back to the condenser inlet of the generator set via an external pipeline for continued recycling, thereby forming a circulating water circulation system.

[0043] The high-level water-collecting cooling tower 1 usually includes a fan layer 101, a water remover layer 102, a water distribution layer 103, a packing layer 104 and a water-collecting layer 105 which are connected in sequence from top to bottom. An overhead layer 106 is provided below the water-collecting layer 105. The water-collecting layer 105 may include a water collecting trough. The water inlet pipe 200 is connected to the water distribution layer 103. The circulating hot water outputted by the condenser of the generator set is transported to each water inlet pipe 200 through the return water main pipe 301 and the annular branch pipe 302, and then sent to the water distribution layer 103 in the high-level water collection cooling tower 1 by the water inlet pipe 200, and then flows through the water distribution pipe of the water distribution layer 103 in turn, and the circulating water is sprayed to the packing of the packing layer 104 through the nozzle installed on the water distribution pipe; the circulating water is sprayed through the nozzle, sprayed and landed on the surface of the packing in the form of water mist, and in the packing layer 104, the circulating water flows through the surface of the packing in the form of a water film, and directly contacts with the cold air flowing from bottom to top for heat exchange, thereby reducing the water temperature. Below the packing layer 104, the circulating water gathers into droplets and falls in the form of raindrops, and continues to contact and exchange heat with the cold air flowing in the opposite direction during the falling process, and finally falls into the water collection tank of the water collection layer 105. The water collecting tank intercepts and collects the cooled circulating water, and finally sends it back to the condenser of the generator set through an external pipeline, completing the cooling and high-position collection process of the circulating water, which can reduce the water supply height of the cooling tower and achieve the effect of reducing the noise of falling water. At the same time, the outside air enters the high-position water collecting cooling tower 1 from the bottom, passes through the water collecting layer 105 and the packing layer 104 from bottom to top, and directly contacts with the circulating water film on the surface of the packing for sufficient heat exchange. It is then drawn out of the high-position water collecting cooling tower 1 from the top by the fan of the fan layer 101, realizing mechanical forced top suction, ensuring the stability of the cooling air volume, realizing the superposition effect of natural ventilation and mechanical ventilation, and greatly improving the cooling efficiency and the stability of the cooling performance.

[0044] The cooling tower circulating water system of the embodiment of the present application creates feasible conditions for arranging the annular branch pipe 302 of the return pipe assembly 300 into a ring by adjusting the grouping method of the cooling tower group 100. Compared with the branch-shaped water distribution, the annular branch pipe 302 arranged in a ring has higher water distribution uniformity, which reduces the unevenness of water pressure and water volume distribution between the high-position water collection cooling towers 1 at different positions, achieves uniform water distribution, improves the operating conditions of the high-position water collection cooling tower 1, enhances the cooling performance and the power generation efficiency of the power plant, and can effectively alleviate the problems of uneven water distribution in the cooling tower and unstable water temperature at the outlet of the tower, which affect the power generation efficiency of the power plant in the related technology.

[0045] In some embodiments, the annular branch pipe 302 is disposed in a lower area of ​​the corresponding cooling tower group 100, and the annular branch pipe 302 is buried underground.

[0046] Since the process pipelines of equipment in power plants are usually arranged near roads, and there are no roads and multiple beams and columns below the high-level water collection cooling tower 1, and the high-level water collection cooling tower 1 eliminates the water collection tank at the bottom of the tower, there are no other process pipelines and no traffic loads in the area below the cooling tower group 100, thus creating feasible conditions for the annular branch pipe 302 of the return pipe assembly 300 to be arranged in a ring under the cooling tower group 100. The buried arrangement of the annular branch pipe 302 means that the annular branch pipe 302 is buried below the ground in the area below the cooling tower group 100. At the same time, the return water main 301 is connected from the main plant of the power plant and buried nearby to enter the area below the cooling tower group 100.

[0047] By burying the annular branch pipe 302 in the area below the cooling tower group 100 directly nearby, the return pipe assembly 300 can be buried under the ground in the area near the cooling tower group 100, ensuring the safety of the return pipe assembly 300, making full use of the space under the tower, saving land, and avoiding the detour arrangement of the traditional wet cooling tower circulating water return pipe to avoid the cooling tower collection tank, optimizing the pipeline layout, shortening the pipeline length of the return pipe assembly 300, and reducing the material cost and installation cost of the return pipe assembly 300 pipeline, which is beneficial to reducing the head of the circulating water pump, thereby saving the power consumption of the circulating water pump, greatly reducing the power consumption of the power plant, and achieving significant energy-saving effects.

[0048] In some embodiments, the soil covering thickness of the top of the annular branch pipe 302 is greater than or equal to 0.5 meters and less than or equal to 2 meters.

[0049] Since there are no other process pipelines below the ground in the lower area of ​​the high-level water-collecting cooling tower 1, the annular branch pipe 302 is arranged in the lower area of ​​the cooling tower group 100. The top of the annular branch pipe 302 does not need to reserve installation space for other pipelines, and a shallow pipeline burial scheme can be adopted to reduce the burial depth of the annular branch pipe 302; wherein, "shallow burial" refers to a burial scheme in which the soil cover thickness of the pipe top is less than or equal to 2 meters, and the optional range of the soil cover thickness of the pipe top is continuous, as long as it is between 0.5 meters and 2 meters; for example, the soil cover thickness of the pipe top of the annular branch pipe 302 can be reduced to 0.5 meters, 0.8 meters, 1 meter, 1.2 meters, 1.5 meters or 2 meters.

[0050] In this way, the amount of trench excavation and backfilling work and the thickness of the pipe wall during the construction of the return pipe assembly 300 can be reduced, saving project investment. At the same time, the inspection holes, valve wells, etc. attached to the return pipe assembly 300 are also arranged under the tower, which can also reduce the impact of maintenance excavation on surrounding buildings, which is beneficial to the maintenance and service life of the pipeline.

[0051] In some embodiments, the high-position water-collecting cooling tower 1 includes a tower body 11 , and the water inlet pipe 200 is disposed inside the tower body 11 of the corresponding high-position water-collecting cooling tower 1 .

[0052] The fan layer 101, the water remover layer 102, the water distribution layer 103, the packing layer 104 and the water collection layer 105 of the high-level water collection cooling tower 1 are all arranged inside the tower body 11. The annular branch pipe 302 is arranged in the lower area of ​​the cooling tower group 100, and the water inlet pipe 200 corresponding to each high-level water collection cooling tower 1 is connected by the annular branch pipe 302, and each water inlet pipe 200 is arranged inside the tower body 11. In this way, the facade of the high-level water collection cooling tower 1 has no pipes and perforations, and the facade design of the cooling tower group 100 is neat and tidy, the structure is beautiful, the aesthetics is improved, and the problem of exposed pipes is not beautiful is solved, which meets the aesthetic requirements of modern urban power plants.

[0053] In some embodiments, the water inlet pipe 200 is arranged in the weak wind area 111 inside the tower body 11 of the corresponding high-position water collection cooling tower 1 .

[0054] The weak wind area 111 of the high-position water collection cooling tower 1 refers to an area inside the tower body 11 where the wind speed is relatively low and the cooling efficiency is relatively poor when the high-position water collection cooling tower 1 is in operation, also known as a low-efficiency area.

[0055] By arranging the water inlet pipe 200 corresponding to the high-position water collecting cooling tower 1 in the weak wind zone 111, the space below the ground and in the weak wind zone 111 below the high-position water collecting cooling tower 1 is fully utilized, thereby reducing the impact on the air inlet conditions of the high-position water collecting cooling tower 1 and improving the cooling performance and power generation efficiency of the power plant.

[0056] In some embodiments, see Figure 2 The high-level water collection cooling tower 1 also includes a water distribution component 12, which is arranged inside the tower body 11 and located on the side where the two rows of high-level water collection cooling towers 1 are close to each other; the annular branch pipe 302 is located below the water distribution component 12, and one end of the water inlet pipe 200 is connected to the annular branch pipe 302, and the other end is connected to the water distribution component 12 of the corresponding high-level water collection cooling tower 1.

[0057] In the lower area of ​​the cooling tower group 100, a ring branch pipe 302 is arranged parallel to the water distribution component 12 near the position directly below the water distribution component 12 of multiple high-level water collection cooling towers 1, and enters the tower body 11 of the high-level water collection cooling tower 1 through the vertical water inlet pipe 200 riser. The ring branch pipe 302 distributes the external circulating water to the water distribution component 12 in each high-level water collection cooling tower 1 through the water inlet pipe 200; the water distribution component 12 serves as the end point of the water inlet pipe 200; the water distribution component 12 may include a water distribution tank, such as a concrete tank, or a water distribution main pipe, and the specific form of the water distribution component 12 is not limited here. The water distribution component 12 is connected to the water distribution pipe of the water distribution layer 103, and the circulating water in the water distribution component 12 is transported to the spray device through the water distribution pipe of the water distribution layer 103, and the spray device sprays the high-level water collection cooling tower 1. In this way, the return pipe assembly 300 can uniformly supply water to each high-position water collection cooling tower 1, and the structure is simple and compact, which is conducive to reducing the overall volume of the high-position water collection cooling tower 1, occupies a small area, and distributes water evenly.

[0058] In some embodiments, see Figure 2 The high-position water-collecting cooling tower 1 is provided with an air inlet 112 , and the air inlet 112 is located on the side of the two rows of high-position water-collecting cooling towers 1 that are away from each other.

[0059] The air inlet 112 of the high-position water collection cooling tower 1 is connected to the overhead layer 106, and the air inlet 112 is arranged at the bottom of the tower body 11, and the outside air can flow into the tower body 11 through the air inlet 112. The two sides of the high-position water collection cooling tower 1 that are separated from each other are respectively provided with air inlets 112 that are connected to the inside of the tower body 11, forming a single-side air inlet mechanical ventilation cooling tower structure arranged back to back.

[0060] In this way, two rows of high-level water-collecting cooling towers 1 can ensure simultaneous air intake, which is beneficial to increasing the air intake volume, ensuring the air intake efficiency, and improving the cooling performance and the power generation efficiency of the power plant. Moreover, the back-to-back arrangement structure is simple and compact, making full use of the space, reducing the occupied space, and occupying a small area. At the same time, the unified water supply is adopted, which is beneficial to further optimize the pipeline layout, shorten the pipeline length of the return pipe assembly 300, reduce the material cost and installation cost of the return pipe assembly 300 pipeline, reduce the head of the circulating water pump, save the power consumption of the circulating water pump, and greatly reduce the power consumption of the power plant.

[0061] In some embodiments, each cooling tower group 100 further includes a main water collecting tank 20 , and the main water collecting tank 20 is disposed between two rows of high-level water collecting cooling towers 1 in the first direction.

[0062] The cooling tower group 100 is provided with an installation area 30 between the tower bodies 11 of two rows of high-level water-collecting cooling towers 1, and the main water collecting tank 20 is installed in the installation area 30, so that the main water collecting tank 20 can be hidden between the two rows of tower bodies 11; the water collecting tanks of the water collecting layers 105 of each high-level water-collecting cooling tower 1 are all connected to the main water collecting tank 20, and the water collecting tank collects the circulating water into the main water collecting tank 20 between the two rows of high-level water-collecting cooling towers 1, and the circulating water in the main water collecting tank 20 is finally transported to the inlet of the condenser of the generator set to complete the circulating cooling. In this way, the main water collecting tank 20 is hidden between the two rows of high-level water-collecting cooling towers 1, which is convenient for collecting the cooling water discharged by the high-level water-collecting cooling towers 1 on both sides, and the appearance is beautiful.

[0063] In some embodiments, see Figure 1 The cooling tower circulating water system includes at least two cooling tower groups 100 and at least two return water pipe assemblies 300 arranged at intervals along the second direction; the cooling tower circulating water system also includes a circulating pump room 400 arranged between two adjacent cooling tower groups 100 in the second direction, and a circulating water pump 401 and a water absorption tank 402 are provided in the circulating pump room 400.

[0064] The main plant of a power plant is usually equipped with multiple steam turbine generator sets, such as two generator sets; the condenser inlet of each generator set is connected to the circulating water supply pipe, and the condenser outlet is connected to the return water main 301 of the return water pipe assembly 300; the annular branch pipes 302 of the two return water pipe assemblies 300 corresponding to the two invention units are arranged in a ring under the corresponding cooling tower group 100. A gap is set between two adjacent cooling tower groups 100 for arranging the above-ground circulating pump room 400, so as to realize the arrangement of the circulating pump room 400 sandwiched between the cooling tower groups 100. The circulating water required by the two generator sets is cooled by the air intake of the two cooling tower groups 100 on both sides of the circulating pump room 400. For example, the two rows of high-level water-collecting cooling towers 1 of the cooling tower group 100 are arranged back to back, and the number of high-level water-collecting cooling towers 1 in each row is not less than two, such as two, three or four. The main water collection tank 20 is connected to the water absorption tank 402 through a drainage pipe, and the water absorption tank 402 is connected to the circulating water pump 401, and the circulating water pump 401 is connected to the condenser inlet of the generator set through a circulating water supply pipe. The circulating water collected in the main water collection tank 20 enters the water absorption tank 402, and is transported to the circulating water pump 401 by a water pipe for pressure boosting. The pressurized circulating water is transported to the condenser of the generator set by the circulating water supply pipe; the circulating water pump 401 is connected between the water absorption tank 402 and the condenser of the generator set to provide power for the flow of the circulating water and complete the circulating cooling.

[0065] By adopting the arrangement of sandwiching the circulating pump room 400 between the cooling tower group 100, the grouping method of the cooling tower group 100 is changed, and the two generator sets corresponding to the two rows of cooling towers arranged in a row are changed to two cooling tower groups 100 corresponding to the two sides of the circulating pump room 400 respectively, so that the annular branches 302 of the two return pipe assemblies 300 are arranged in rings respectively, so as to achieve uniform water distribution, improve the cooling performance and the power generation efficiency of the power plant, and the structure is simple and compact, and the space is fully utilized, which is conducive to further reducing the occupied space and occupying a smaller area.

[0066] In some embodiments, see Figure 1 The cooling tower circulating water system also includes a communication pipe 501 and a communication valve 502 . The communication pipe 501 and the communication valve 502 are connected between the two return pipe assemblies 300 , and the communication pipe 501 is arranged below the circulating pump room 400 .

[0067] One end of the communication pipe 501 is located below a cooling tower group 100 and is connected to a corresponding return pipe assembly 300; the middle part of the communication pipe 501 is passed through the inside of the circulation pump room 400; the other end of the communication pipe 501 is located below another cooling tower group 100 and is connected to another corresponding return pipe assembly 300 through a communication valve 502.

[0068] By arranging the communication pipeline 501 to pass through the circulation pump room 400 from below, the pipeline layout is optimized and the communication pipeline 501 is made shorter.

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A cooling tower circulating water system, characterized in that: include: At least one cooling tower group, each cooling tower group includes two cooling tower columns arranged along a first direction, each cooling tower column includes at least one high-level water collection cooling tower arranged along a second direction, the first direction and the second direction are perpendicular to each other; A plurality of water inlet pipes, each of the high-level water collection cooling towers is correspondingly connected to one of the water inlet pipes; as well as At least one return pipe assembly, each cooling tower group is correspondingly provided with a return pipe assembly, each return pipe assembly comprises a return pipe and a ring branch pipe, one end of the return pipe is used to recover circulating hot water, and the other end is connected to the ring branch pipe, and the ring branch pipe is connected to the corresponding multiple water inlet pipes.

2. The cooling tower circulating water system according to claim 1, characterized in that: The annular branch pipe is arranged in the lower area of ​​the corresponding cooling tower group, and the annular branch pipe is buried underground.

3. The cooling tower circulating water system according to claim 2, characterized in that: The soil covering thickness of the top of the annular branch pipe is greater than or equal to 0.5 meters and less than or equal to 2 meters.

4. The cooling tower circulating water system according to claim 2, characterized in that: The high-position water collection cooling tower comprises a tower body, and the water inlet pipe is arranged inside the tower body of the corresponding high-position water collection cooling tower.

5. The cooling tower circulating water system according to claim 4, characterized in that: The water inlet pipe is arranged in a weak wind area inside the tower body of the corresponding high-position water collection cooling tower.

6. The cooling tower circulating water system according to claim 4, characterized in that: The high-level water collection cooling tower also includes a water distribution component, which is arranged inside the tower body and located on the side where the two rows of high-level water collection cooling towers are close to each other; the annular branch pipe is located below the water distribution component, one end of the water inlet pipe is connected to the annular branch pipe, and the other end is connected to the corresponding water distribution component of the high-level water collection cooling tower.

7. The cooling tower circulating water system according to claim 1, characterized in that: The high-position water-collecting cooling tower is provided with an air inlet, and the air inlet is located on the side of the two rows of high-position water-collecting cooling towers that are away from each other.

8. The cooling tower circulating water system according to claim 1, characterized in that: Each cooling tower group further includes a main water collecting tank, and the main water collecting tank is arranged between two rows of high-level water collecting cooling towers in the first direction.

9. The cooling tower circulating water system according to any one of claims 1 to 8, characterized in that: The cooling tower circulating water system includes two cooling tower groups and two return water pipe assemblies arranged at intervals along the second direction; the cooling tower circulating water system also includes a circulating pump room arranged between the two cooling tower groups in the second direction, and a circulating water pump and a water absorption tank are provided in the circulating pump room.

10. The cooling tower circulating water system according to claim 9, characterized in that: The cooling tower circulating water system also includes a communication pipe and a communication valve, wherein the communication pipe and the communication valve are connected between the two return pipe assemblies, and the communication pipe is passed through the bottom of the circulating pump room.

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