Cooling water system of generator set, cooling tower and water distribution method of cooling tower

Abstract

The invention relates to a cooling water system of a generator set, a cooling tower and a water distribution method of the cooling tower, and the cooling tower comprises a tower body which forms a cooling space; the water collecting tank is arranged on the lower side of the tower body; the packing layer is arranged in the cooling space; the water distribution device is arranged in the cooling space; wherein the water distribution device comprises a first water distribution assembly, a second water distribution assembly and a third water distribution assembly, and the first water distribution assembly is arranged on one side, far away from the water collecting tank, of the filler layer; the second water distribution assembly is arranged on one side, close to the water collecting tank, of the filler layer. According to the technical scheme, different cooling modes can be adopted for cooling water under different operation working conditions of the generator set, damage caused by freezing and falling of the filler in the filler layer in cold winter is avoided, and the use cost of the cooling water system of the generator set in winter is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of direct contact water shower coolers, and in particular to a cooling water system, a cooling tower and a water distribution method for a generator set. Background Art

[0002] In winter, after the heating units of thermal power plants switch to condensation and extraction operation, the steam inlet to the low-pressure cylinder decreases, the circulating water volume of the units is greatly reduced, and the cooling tower water distribution mode needs to be switched to two units and one tower operation. Under this condition, a small amount of circulating water enters the packing layer in cold weather, causing severe icing of the cooling tower. During the thawing process, a large number of icicles fall and damage the packing. Therefore, a new cooling system is added to the original cooling system. However, the addition of a new cooling system greatly increases the construction and use costs of the coal-fired wet cooling unit system.

[0003] Chinese patent document, CN113028854A, discloses a system and method for preventing freezing in winter and reducing back pressure in summer for coal-fired wet cooling units. The system connects a new cooling system in parallel with the original cooling system, so that the cooling system of the cooling unit has multiple modes to choose from. The invention mainly adds a new cooling circulation system, uses a low-power circulating water pump, reduces the cooling water flow, ensures that the head is consistent with the original circulating water pump, and increases the cooling water temperature. At the same time, when the heat load entering the condenser increases, the tower-up method is changed and the cooling tower is re-up.

[0004] Under the existing two-machine-one-tower operating conditions, to ensure the normal operation of the coal-fired wet cooling unit system, the cooling effect of the cooling tower must be guaranteed. In winter when the temperature is low, it is usually necessary to replace the filler in the cooling tower in time or add a new cooling system to ensure the cooling effect of the coal-fired wet cooling unit system, which increases the use cost of the coal-fired wet cooling unit system. Summary of the invention

[0005] An embodiment of the present application provides a cooling water system, a cooling tower and a water distribution method thereof for a generator set. By adjusting the water distribution method of the cooling tower, the use cost of the cooling water system of the generator set in winter is reduced, so as to at least partially solve the above-mentioned technical problems.

[0006] In order to achieve the above object, according to a first aspect of the present application, a cooling tower is provided for a cooling water system of a generator set, comprising:

[0007] A tower body, wherein the tower body forms a cooling space;

[0008] A water collection tank is arranged at the lower side of the tower body;

[0009] A packing layer is arranged in the cooling space;

[0010] A water distribution device, arranged in the cooling space;

[0011] Wherein, the water distribution device comprises:

[0012] A first water distribution assembly is arranged on a side of the packing layer away from the water collection tank;

[0013] The second water distribution component is arranged on a side of the packing layer close to the water collection tank.

[0014] Optionally,

[0015] The water distribution device also includes:

[0016] A plurality of water distribution well pipes are arranged in the cooling space;

[0017] The well pipe water valve is connected to the water distribution well pipe and is used to control the flow rate of cooling water in the water distribution well pipe.

[0018] Optionally,

[0019] The second water distribution assembly comprises:

[0020] A second water distribution pipe and a plurality of spray pipes, wherein the second water distribution pipe is connected to the spray pipes.

[0021] Optionally,

[0022] A plurality of the spray pipes are evenly arranged on the second water distribution pipe.

[0023] Optionally,

[0024] The water distribution device also includes:

[0025] A water control valve is arranged between the second water distribution pipe and the water distribution well pipe.

[0026] Optionally,

[0027] A water collector is arranged on a side of the first water distribution component away from the packing layer;

[0028] A fan is arranged on a side of the water collector away from the packing layer;

[0029] The air distribution assembly is arranged between the second water distribution assembly and the water collecting tank.

[0030] According to a second aspect of the present application, a cooling water system of a generator set is provided, comprising:

[0031] The cooling tower, cooling water circulation pump and machine condenser described in the first aspect of the present application, wherein the cooling water circulation pump is connected to the cooling tower and the machine condenser respectively.

[0032] According to a third aspect of the present application, a water distribution method for a cooling tower according to the first aspect of the present application is provided, characterized in that the water distribution method comprises the following steps:

[0033] Determine the operating status of the cooling water system of the generator set;

[0034] When the cooling water system of the generator set is in a condensing and pumping operation state, the control water valve is opened;

[0035] The cooling water enters the second water distribution assembly, wherein the cooling water first enters the second water distribution pipe, and then is sprayed through the spray pipe into the water collection tank;

[0036] When the cooling water system of the generator set exits the condensation and extraction operation state, the control water valve is closed;

[0037] After the cooling water is sprayed by the first water distribution component, the cooling water enters the packing layer. After the cooling water passes through the packing layer, the cooling water enters the water collecting tank.

[0038] Optionally,

[0039] When the cooling water system of the generator set is in a condensation and extraction operation state, the cooling water enters the second water distribution assembly through the water distribution well pipe;

[0040] When the cooling water system of the generator set exits the condensation and extraction operation state, the cooling water enters the first water distribution assembly through the water distribution well pipe.

[0041] Optionally,

[0042] When the cooling water system of the generator set is in the condensation and extraction operation state, the opening degree of the well pipe water valve is 1% to 10%.

[0043] In the cooling tower of the embodiment of the present application, the tower body forms a cooling space; the water collecting tank is arranged at the lower side of the tower body; the packing layer is arranged in the cooling space; the water distribution device is arranged in the cooling space; wherein the water distribution device comprises: a first water distribution component is arranged on the side of the packing layer away from the water collecting tank; a second water distribution component is arranged on the side of the packing layer close to the water collecting tank. Through the above technical scheme, the generator set adopts different methods for cooling the cooling water under different operating conditions, thereby reducing the use cost of the cooling water system of the generator set in winter.

[0044] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0046] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0047] Figure 1 is a schematic diagram of the overall structure of a cooling tower provided in an exemplary embodiment of the present disclosure;

[0048] Figure 2 is an internal cross-sectional view of a cooling tower provided in an exemplary embodiment of the present disclosure;

[0049] Figure 3 is a schematic structural diagram of a heat dissipation portion provided in an exemplary embodiment of the present disclosure being connected to a housing;

[0050] Figure 4 yes Figure 2 Enlarged schematic diagram of part A.

[0051] Description of reference numerals:

[0052] 1. Cooling water system of generator set;

[0053] 100. Cooling tower;

[0054] 110. tower body; 111. cooling space;

[0055] 120. Catchment pool;

[0056] 130, packing layer;

[0057] 140, water distribution device; 141, first water distribution assembly; 142, second water distribution assembly; 1421, second water distribution pipe; 1422, sprinkler pipe; 143, water distribution well pipe; 144, well pipe water valve; 145, control water valve;

[0058] 200. Cooling water circulation pump;

[0059] 300, machine condenser; DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0061] According to the first aspect of the present application, referring to Figure 1 to Figure 2 The present disclosure provides a cooling tower 100 including: a tower body 110 , a water collecting tank 120 , a packing layer 130 and a water distribution device 140 .

[0062] The cooling tower 100 of the present application is used for the cooling water system 1 of the generator set. The cooling water refers to the water that needs to be cooled during the operation of the generator set. The tower body 110 adopts a hyperbolic cooling tower 100, and the tower body 110 forms a cooling space 111. The packing layer 130 is arranged in the cooling space 111. The packing layer 130 makes the cooling water form water droplets or water films after multiple splashes, increases the contact area between water and air and prolongs the contact time, promotes the heat exchange between hot water and air, and cools the water. The water distribution device 140 is arranged in the cooling space 111. The function of the water distribution device 140 is to distribute the cooling water. The water distribution device 140 has a great influence on the cooling effect of the cooling water. If the water volume is unevenly distributed, it will not only directly reduce the cooling effect of the water, but also cause some cooling water droplets to splash and drift out of the tower, increasing the water loss. The water collection tank 120 is arranged on the lower side of the tower body 110, which is used to collect the cooling water after cooling. At the same time, the water collection tank 120 has a certain volume and also plays a role in regulating the water volume.

[0063] As a more specific embodiment, the water distribution device 140 includes: a first water distribution component 141 and a second water distribution component 142. The first water distribution component 141 is arranged on the side of the packing layer 130 away from the water collection tank 120, and the second water distribution component 142 is arranged on the side of the packing layer 130 close to the water collection tank 120.

[0064] When the steam turbine of the generator set is in condensation and extraction operation, the water to be cooled enters the second water distribution component 142, and the second water distribution component 142 processes the water to be cooled. After the processing is completed, the water to be cooled enters the water collection tank 120 by spraying or other means. After the steam turbine of the generator set exits the condensation and extraction operation, the water to be cooled enters the first water distribution component 141, and after being processed by the first water distribution component 141, the water to be cooled enters the packing layer 130, and after being processed by the packing layer 130, enters the water collection tank 120.

[0065] In winter, under the condensing and pumping back operation condition, the generator set requires a relatively small amount of circulating cooling water. At this time, if a small amount of circulating water enters the packing layer 130 in cold weather, the packing in the packing layer 130 of the cooling tower 100 will be frozen and fall to damage the packing. The damaged packing will enter the condenser, water supply pump oil cooler, generator air cooler, machine body oil cooler, manual water filter, electric water filter and other devices of the generator set through the pipeline, causing damage to the above-mentioned devices or causing greater energy consumption.

[0066] In the technical solution of the present application, under the condensation and pumping operation condition in winter, since the amount of cooling water used by the generator set is relatively small, the cooling water used to cool the generator set enters the second water distribution component 142. After the second water distribution component 142 processes the cooling water, it can meet the needs of the generator set. At this time, the cooling water does not need to enter the first water distribution component 141. Since the second water distribution component 142 is on the lower side of the packing layer 130, the cooling water does not need to be processed by the packing layer 130. Therefore, the packing in the packing layer 130 will not freeze and fall, thereby damaging the packing layer 130.

[0067] In some embodiments of the present application, the water distribution device 140 further includes: a plurality of water distribution well pipes 143 and well pipe water valves 144, the water distribution well pipes 143 and the well pipe water valves 144 are arranged in the cooling space 111, the well pipe water valves 144 are connected to the water distribution well pipes 143, and the well pipe water valves 144 are used to control the flow of cooling water in the water distribution well pipes 143. When the required cooling water flow is small, the opening degree of the well pipe water valve 144 is opened to 1% to 10%, which can be adjusted according to the actual working conditions, and the cooling water enters the second water distribution assembly 142 at this time.

[0068] In some implementations of the present application, the second water distribution assembly 142 includes: a second water distribution pipe 1421 and a plurality of spray pipes 1422, the second water distribution pipe 1421 and the spray pipe 1422 are connected, and the plurality of spray pipes 1422 are evenly arranged in the second water distribution pipe 1421, and the cooling water can be evenly sprayed out through the second water distribution pipe 1421 and the spray pipe 1422, thereby improving the cooling effect of the cooling water. In the present application, the water distribution device 140 also includes: a control water valve 145, the control water valve 145 is arranged between the second water distribution pipe 1421 and the water distribution well pipe 143, and by adjusting the opening of the control water valve 145, it is determined whether the cooling water can enter the second water distribution pipe 1421, when the cooling water does not need to enter the second water distribution assembly 142, the control water valve 145 is closed, and when the cooling water needs to enter the second water distribution assembly 142, the control water valve 145 is opened.

[0069] In some embodiments of the present application, the cooling tower 100 further includes: a water collector, a fan and an air distribution assembly (not shown in the figure). The water collector is arranged on the side of the first water distribution assembly 141 away from the packing layer 130; the fan is arranged on the side of the water collector away from the packing layer 130; the air distribution assembly is arranged between the second water distribution assembly 142 and the water collection tank 120. The water collector is used to recover water droplets carried away by the air flow and reduce water loss. It is usually made of materials such as plastic and fiberglass, and has a shape of corrugated plate, honeycomb, etc. The fan is the power equipment of the cooling tower 100. It generates airflow through rotation, introduces air into the tower and exchanges heat with water. The air distribution assembly guides the air to be evenly distributed over the entire cross-section of the cooling tower 100 to ensure that the air is fully in contact with the water and improve the heat exchange efficiency.

[0070] According to the second aspect of the present application, referring to Figure 3 The present application provides a cooling water system 1 for a generator set, comprising: the cooling tower 100 described in the first aspect of the present application, and a cooling water circulation pump 200 and a machine condenser 300, wherein the circulation pump is connected to the cooling tower 100 and the cooling water circulation pump 200, respectively. The cooling water circulation pump 200 is responsible for extracting the cooled circulating water from the sump 120 at the bottom of the cooling tower 100, and delivering it to the machine condenser 300 and other equipment after boosting the pressure to provide a cooling water source for it. The cooling water circulation pump 200 usually adopts a horizontal centrifugal pump or a vertical axial flow pump, and its flow rate and head need to be reasonably selected according to factors such as the cooling demand of the generator set and the resistance of the circulating water system.

[0071] According to the third aspect of the present application, referring to Figure 4 , a water distribution method for a cooling tower 100 is provided, the water distribution method comprising the following steps:

[0072] Determine the operating status of the cooling water system 1 of the generator set;

[0073] When the cooling water system 1 of the generator set is in the condensation and extraction operation state, the control water valve 145 is opened;

[0074] The cooling water enters the second water distribution assembly 142, wherein the cooling water first enters the second water distribution pipe 1421, and then is sprayed through the spray pipe 1422 into the water collection tank 120;

[0075] When the cooling water system 1 of the generator set exits the condensation and extraction operation state, the control water valve 145 is closed;

[0076] The cooling water is sprayed through the first water distribution component 141 , and the cooling water enters the packing layer 130 . After passing through the packing layer 130 , the cooling water enters the water collecting tank 120 .

[0077] Among them, when the cooling water system 1 of the generator set is in the condensing and pumping back operation state, the cooling water enters the second water distribution component 142 through the water distribution well pipe 143, and the opening degree of the well pipe water valve 144 is 1% to 10%; when the cooling water system 1 of the generator set exits the condensing and pumping back operation state, the cooling water enters the first water distribution component 141 through the water distribution well pipe 143.

[0078] In the description of this application, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0081] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A cooling tower, used in the cooling water system of a generator set, characterized in that: include: A tower body, wherein the tower body forms a cooling space; A water collection tank is arranged at the lower side of the tower body; A packing layer is arranged in the cooling space; A water distribution device, arranged in the cooling space; Wherein, the water distribution device comprises: A first water distribution assembly is arranged on a side of the packing layer away from the water collection tank; The second water distribution component is arranged on a side of the packing layer close to the water collection tank.

2. The cooling tower according to claim 1, characterized in that The water distribution device also includes: A plurality of water distribution well pipes are arranged in the cooling space; The well pipe water valve is connected to the water distribution well pipe and is used to control the flow rate of cooling water in the water distribution well pipe.

3. The cooling tower according to claim 2, characterized in that: The second water distribution assembly comprises: A second water distribution pipe and a plurality of spray pipes, wherein the second water distribution pipe is connected to the spray pipes.

4. The cooling tower according to claim 3, characterized in that: A plurality of the spray pipes are evenly arranged on the second water distribution pipe.

5. The cooling tower according to claim 3, characterized in that: The water distribution device also includes: A water control valve is arranged between the second water distribution pipe and the water distribution well pipe.

6. The cooling tower according to any one of claims 1 to 5, characterized in that: Also includes: A water collector is arranged on a side of the first water distribution component away from the packing layer; A fan is arranged on a side of the water collector away from the packing layer; The air distribution assembly is arranged between the second water distribution assembly and the water collecting tank.

7. A cooling water system for a generator set, characterized in that it comprises: The cooling tower, cooling water circulation pump and machine condenser as described in any one of claims 1 to 6, wherein the cooling water circulation pump is connected to the cooling tower and the machine condenser respectively.

8. The water distribution method for a cooling tower according to any one of claims 1 to 6, characterized in that: The water distribution method comprises the following steps: Determine the operating status of the cooling water system of the generator set; When the cooling water system of the generator set is in a condensing and pumping operation state, the control water valve is opened; The cooling water enters the second water distribution assembly, wherein the cooling water first enters the second water distribution pipe, and then is sprayed through the spray pipe into the water collection tank; When the cooling water system of the generator set exits the condensation and extraction operation state, the control water valve is closed; After the cooling water is sprayed by the first water distribution component, the cooling water enters the packing layer. After the cooling water passes through the packing layer, the cooling water enters the water collecting tank.

9. The water distribution method for a cooling tower according to claim 8, characterized in that: When the cooling water system of the generator set is in a condensation and extraction operation state, the cooling water enters the second water distribution assembly through the water distribution well pipe; When the cooling water system of the generator set exits the condensation and extraction operation state, the cooling water enters the first water distribution assembly through the water distribution well pipe.

10. The water distribution method for a cooling tower according to claim 9, characterized in that: When the cooling water system of the generator set is in the condensation and extraction operation state, the opening degree of the well pipe water valve is 1% to 10%.

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