A peak shaving cooling system with cross arrangement of intercooling columns

Abstract

The utility model relates to the technical field of power plant cold end optimization, disclose a kind of peak cooling system of cross arrangement of indirect cooling tower, including two direct air cooling units, and any direct air cooling unit is connected with mechanical ventilation indirect cooling tower, the mechanical ventilation indirect cooling tower includes multiple cooling units, and multiple cooling units in the same mechanical ventilation indirect cooling tower are cross arranged in two different orientations;The utility model is based on having no water loss, site layout flexible, considering environmental wind direction, so that the cooling section of each unit is arranged separately in different windward face, fully exert the cooling capacity of indirect cooling tower, effectively improve the cooling efficiency of peak cooling system.

Description

Technical Field

[0001] This utility model relates to the field of power plant cold end optimization technology, specifically a peak cooling system with intercooling towers arranged in a cross pattern. Background Technology

[0002] Direct air-cooled units utilize mechanical ventilation, allowing turbine exhaust steam to condense directly in the finned-tube air-cooled condenser of the air-cooled island. Due to their water-saving characteristics, they are widely used in thermal power plants in my country, and are a common type in arid northern regions. However, the operation of direct air-cooled units is susceptible to environmental and temperature variations. In high-temperature summer conditions, the air cooling capacity decreases due to the influence of temperature, wind speed, and wind direction, resulting in higher back pressure and insufficient peak power generation capacity. Furthermore, due to their geographical location, the natural environment at the plant site is often harsh, with windblown sand and pollen further affecting the operation of the air-cooled island, causing blockages that cannot be resolved by cleaning the tube bundles and fan fins. The heat exchange capacity of the direct air-cooling system is severely affected, further increasing turbine back pressure, significantly impacting load-carrying capacity, reducing unit operating efficiency, and failing to meet grid dispatch requirements.

[0003] To address the problems of direct air-cooled systems, a system was added to modify and upgrade them; this is called a peak cooling system. Peak cooling systems can effectively reduce back pressure under high-temperature conditions in summer, improving unit operating efficiency.

[0004] Indirect cooling towers are mechanically driven and utilize ambient air to cool the circulating water system. This closed-loop cooling water system offers advantages such as low back pressure, low head, low power consumption, and high economic efficiency, making them widely used in thermal power plants. However, due to the varying geographical locations of power plants and the complexity of the environment, ambient wind has a certain impact on the cooling efficiency of the indirect cooling system. The direction and speed of the wind affect the cooling capacity of the indirect cooling tower's cooling units.

[0005] Currently, reducing unit back pressure is an effective method to improve unit operating efficiency and ensure safe operation. Increasing the cold-end heat dissipation capacity of the air-cooled island helps power plants smoothly meet peak summer demand. Common peak cooling system solutions include: increasing the heat dissipation area of ​​the air-cooled island condenser; adding an evaporative condenser system; and adding a surface condenser with a mechanical ventilation cooling system.

[0006] Option 1: Increase the heat dissipation area of ​​the air-cooled condenser. This option effectively improves heat exchange capacity by increasing the heat dissipation area of ​​the air-cooled condenser, thereby reducing the unit's back pressure. Adding an air-cooled cooling unit outside the existing air-cooled unit requires adding air-cooled island supports; therefore, it is necessary to consider whether the site layout at the air-cooled island can meet the requirements.

[0007] Option 2: Add an evaporative condenser system. This option involves adding an evaporative condenser to divert some of the exhaust steam, with the condensate drained into a condensate tank. This option requires spray cooling water, which can be demineralized water to effectively prevent scaling. This is an open-loop water circulation system, requiring a supporting water treatment system to ensure cooling water quality, thus increasing investment costs. This option suffers from losses due to cooling water evaporation and blowdown, resulting in higher water consumption and making it unsuitable for arid northern regions.

[0008] Option 3: Add a surface condenser and equip it with a mechanical ventilation cooling system. This option is a closed-loop circulating water system. A portion of the exhaust steam is cooled by the surface condenser, and the condensate is discharged to the existing condensate tank. The cooling water is then pumped by a circulating water pump to a mechanical ventilation cooling tower for further cooling. This cycle repeats continuously. During this process, the circulating water does not directly contact the air, resulting in no water loss. This option is suitable for arid northern regions. This option requires the addition of a circulating water pump house and circulating water pipelines.

[0009] In existing technologies, the intermediate cooling towers of the peak cooling systems of two units generally adopt a single-sided air intake and back-to-back arrangement, which fails to consider the impact of ambient wind direction on cooling efficiency and fails to fully utilize the cooling capacity of the intermediate cooling towers, resulting in poor cooling efficiency of the peak cooling system. Utility Model Content

[0010] The purpose of this utility model is to provide a peak cooling system with cross-arranged indirect cooling towers, which, based on the principles of zero water loss and flexible site layout, takes into account the environmental wind direction, separates the cooling sections of each unit on different windward sides, fully utilizes the cooling capacity of the indirect cooling towers, and effectively improves the cooling efficiency of the peak cooling system.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] This utility model discloses a peak cooling system with cross-arranged intercooling towers, comprising two direct air-cooled units, each of which is connected to a mechanically ventilated intercooling tower. The mechanically ventilated intercooling tower includes multiple cooling units, which are cross-arranged in two different orientations within the same mechanically ventilated intercooling tower.

[0013] Furthermore, the number of cooling units arranged in different orientations of the same mechanical ventilation cooling tower is the same.

[0014] Furthermore, each of the cooling units is connected to an axial flow fan for enhancing airflow heat exchange.

[0015] Furthermore, each of the aforementioned direct air-cooled units is connected to a condenser that is connected to the exhaust steam pipeline. The condenser is connected to a condensate tank. A heat exchange tube bundle is arranged inside the condenser. The input end of the heat exchange tube bundle is connected to the mechanical ventilation cooling tower through a circulating water supply pipe, and the output end is connected to the mechanical ventilation cooling tower through a circulating return water pipe. The circulating return water pipe is connected to a circulating water pump for providing the power for medium circulation.

[0016] Furthermore, the heat exchange tube bundle arranged inside the condenser is made of 316L material.

[0017] Furthermore, the condenser is a surface condenser, and the condenser is a single-shell, dual-flow condenser.

[0018] Furthermore, the cooling unit is connected to a radiator, which uses a small six-row aluminum tube with aluminum fins for heat dissipation. The aluminum tubes and aluminum fins have a triangular structure and are arranged horizontally in an A-shape.

[0019] Furthermore, the input and output ends of the two circulating water pumps are connected in parallel via a spare connecting valve for the pumps.

[0020] Furthermore, the two circulating return water pipes and the two circulating water supply pipes are connected by expansion valves.

[0021] Furthermore, each of the mechanical ventilation cooling towers is connected to a buried water tank for draining the water from the corresponding plurality of cooling units, and the buried water tank is connected to the corresponding plurality of cooling units.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This invention arranges multiple cooling units connected to multiple direct air-cooled units in a cross-shaped manner. Based on the principles of zero water loss and flexible site layout, and taking into account the ambient wind direction, the cooling sections of each unit are arranged separately on different windward sides, which fully utilizes the cooling capacity of the indirect cooling tower and improves the cooling efficiency of the peak cooling system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2This is a schematic diagram of the cooling unit of this utility model.

[0027] Reference numerals: Condenser 101, 201; Heat exchanger tube bundle 102, 202; Condensate tank 103, 203; Mechanical ventilation cooling tower 104, 204; Circulating water pump 105, 205; Circulating return water pipe 106, 206; Circulating water supply pipe 107, 207; Pump standby connecting valve 008; Expansion connecting valve 009. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0029] In the following description, the terms "first," "second," and "third" are used only to distinguish different objects and do not represent a specific order of objects, nor are they constituting a chronological order. It is understood that "first," "second," and "third" may be interchanged in a specific order or sequence where permissible, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to limit the invention.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the layers related to the present invention and are not drawn according to the actual number, shape and size of the layers in the actual implementation. In the actual implementation, the form, number and proportion of each layer can be arbitrarily changed, and the layer layout may also be more complex.

[0032] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of the present invention; however, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0033] Please see Figure 1A peak cooling system with interleaved cooling towers includes two direct air-cooled units, each of which is connected to mechanical ventilation interleaved cooling towers 104 and 204. The mechanical ventilation interleaved cooling towers 104 and 204 include multiple cooling units, and the multiple cooling units in the same mechanical ventilation interleaved cooling tower 104 and 204 are interleaved and arranged in two different directions.

[0034] Please see Figure 1 The number of cooling units arranged in different orientations in the mechanical ventilation cooling towers 104 and 204 is the same.

[0035] Please see Figure 1 Each of the cooling units is connected to an axial flow fan for enhancing airflow heat exchange.

[0036] Please see Figure 2 It also includes any one of the direct air-cooled units connected to a condenser 101 or 201 that is connected to a waste steam pipeline. The condenser 101 or 201 is connected to a condensate tank 103 or 203. Heat exchange tube bundles 102 or 202 are arranged inside the condenser 101 or 201. The input end of the heat exchange tube bundles 102 or 202 is connected to a mechanical ventilation cooling tower 104 or 204 through a circulating water supply pipe 107 or 207, and the output end is connected to a mechanical ventilation cooling tower 104 or 204 through a circulating return water pipe 106 or 206. The circulating return water pipe 106 or 206 is connected to a circulating water pump 105 or 205 for providing medium circulation power.

[0037] Please see Figure 2 The heat exchange tube bundles 102 and 202 arranged in the condensers 101 and 201 are made of 316L.

[0038] Please see Figure 2 The condensers 101 and 201 are surface condensers, and the condensers 101 and 201 are single-shell dual-flow condensers.

[0039] The cooling unit is connected to a radiator, which uses a small six-row aluminum tube with aluminum fins for heat dissipation. The aluminum tubes and aluminum fins have a triangular structure and are arranged horizontally in an A-shape.

[0040] Please see Figure 2 The input and output ends of the two circulating water pumps 105 and 205 are connected in parallel through the water pump standby connecting valve 008.

[0041] Please see Figure 2 The two circulating return water pipes 106 and 206 and the two circulating water supply pipes 107 and 207 are respectively connected by expansion valve 009.

[0042] Please see Figure 1Each of the mechanical ventilation cooling towers 104 and 204 is connected to a buried water tank for draining the water from the corresponding cooling units. The buried water tank is connected to the corresponding cooling units.

[0043] In practical applications, please refer to Figure 2 The exhaust steam diverted from the thermal power generator unit's exhaust steam pipeline undergoes heat exchange in newly added surface condensers 101 and 201, transforming into condensate which is then transported to the unit's condensate tanks 103 and 203. The heat exchange medium for the diverted exhaust steam is circulating water supply cooled by mechanical ventilation cooling towers 104 and 204. This circulating water supply flows through heat exchange tube bundles 102 and 202 within condensers 101 and 201 for heat exchange. The returned circulating water, after being heated in the surface condensers 101 and 201, is transported by circulating water pumps 105 and 205 to mechanical ventilation cooling towers 104 and 204 for cooling. The cooled circulating water supply is then transported to the surface condensers 101 and 201 to exchange heat with the diverted exhaust steam. This cycle repeats continuously without water loss. Each mechanical ventilation cooling tower 104 and 204 includes multiple cooling units, each equipped with an axial flow fan to enhance airflow heat exchange.

[0044] The two direct air-cooled units can be interconnected and made standby by the water pump standby valve 008. At the same time, opening the water pump standby valve 008 can switch between the two circulating water pumps 105 and 205.

[0045] The two direct air-cooled units can switch and expand the mechanical ventilation cooling towers 104 and 204 through the expansion valve 009. Specifically, when either mechanical ventilation cooling tower 104 or 204 is shut down, the two expansion valves 009 are opened. The circulating water return can flow to the other mechanical ventilation cooling tower 104 or 204 for heat exchange through the expansion valve 009 connected to the circulating return water pipes 106 and 206. The cooled circulating water can return to the circulating water supply pipe connected to the shut-down mechanical ventilation cooling tower 104 or 204 and the corresponding heat exchange tube bundles 102 and 202 through the expansion valve 009 connected to the circulating water supply pipes 107 and 207 for heat exchange.

[0046] When the peak cooling capacity of the direct air-cooled unit needs to be increased, expansion can be achieved through expansion valve 009. Specifically, when the exhaust steam flow increases, the direct air-cooled unit can be expanded by simultaneously opening two expansion valves 009, namely the spare pump connection valve 008 connected to the input terminals of circulating water pumps 105 and 205. While the condensers 101 and 201 connected to any one of the direct air-cooled units and the mechanical ventilation cooling towers 104 and 204 are performing normal heat exchange and cooling, a portion of the circulating water return water can be transported through the spare pump connection valve 008 connected to the input terminals of circulating water pumps 105 and 205 to the corresponding mechanical ventilation cooling towers 104 and 204 for cooling. The cooled circulating water supply can then be collected and exchanged through the expansion valve 009 connected to the circulating water supply pipes 107 and 207.

[0047] Please see Figure 1 The circulating water return flows through valve V1 into each cooling unit to exchange heat with the air. The cooled circulating water supply flows through valve V2 into the main circulating water supply pipe. Valves V1 and V2 control the start and stop of each cooling unit. The buried water tank is used to drain the radiators and pipes of the surface cooling units in the mechanical ventilation cooling towers 104 and 204 of the peak cooling system. It is connected to each cooling unit through the drain pipe, and valves V3 and V4 control the draining of water from each cooling unit.

[0048] Please see Figure 1 The buried water tank is used to drain the radiators and pipes of the surface cooling units in the mechanical ventilation cooling towers 104 and 204 of the peak cooling system. Taking two direct air-cooled units, with one unit connected to six cooling units as an example, three of the cooling units are arranged in one direction, and the other three in another direction, with different directions. The cooling units connected to each of the two direct air-cooled units adopt a "3+3" cross arrangement. The circulating water return pipe, circulating water supply pipe, and drain pipe are adjusted in direction and arranged crosswise, so that each of the two direct air-cooled units has three cooling units arranged in two directions with different windward faces. This effectively avoids the single orientation of the common mechanical ventilation cooling tower single-sided air intake and back-to-back arrangement, reduces the impact of wind direction and speed on the cooling units under high-temperature conditions in summer, and arranges the cooling sections of each direct air-cooled unit on different windward faces, improves the ventilation and heat exchange capacity of the cooling units in the mechanical ventilation cooling tower, reduces the back pressure of the unit, and effectively improves the heat exchange efficiency of the peak cooling system.

[0049] This invention, with its advantages of zero water loss and flexible site layout, can effectively solve the problems of high back pressure, insufficient peak power generation capacity, and low operating efficiency of the unit under high-temperature conditions in summer.

[0050] In the above embodiments, although the present invention has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims.

[0051] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A peak cooling system with interleaved intercooling towers, characterized in that: It includes two direct air-cooled units, each of which is connected to a mechanical ventilation cooling tower (104, 204). The mechanical ventilation cooling tower (104, 204) includes multiple cooling units, and the multiple cooling units in the same mechanical ventilation cooling tower (104, 204) are arranged crosswise in two different directions.

2. The peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 1, characterized in that, The same mechanical ventilation cooling tower (104, 204) has the same number of cooling units arranged in different orientations.

3. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 1, characterized in that, Each of the cooling units is connected to an axial flow fan for enhancing airflow and heat exchange.

4. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 1, characterized in that, It also includes any one of the direct air-cooled units connected to a condenser (101, 201) connected to a waste steam pipeline. The condenser (101, 201) is connected to a condensate tank (103, 203). The condenser (101, 201) is equipped with heat exchange tube bundles (102, 202). The input end of the heat exchange tube bundles (102, 202) is connected to a mechanical ventilation cooling tower (104, 204) through a circulating water supply pipe (107, 207), and the output end is connected to the mechanical ventilation cooling tower (104, 204) through a circulating return water pipe (106, 206). The circulating return water pipe (106, 206) is connected to a circulating water pump (105, 205) for providing medium circulation power.

5. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 4, characterized in that, The heat exchange tube bundles (102, 202) arranged inside the condensers (101, 201) are made of 316L.

6. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 4, characterized in that, The condensers (101, 201) are surface condensers (101, 201), and the condensers (101, 201) are single-shell dual-flow condensers.

7. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 4, characterized in that, The cooling unit is connected to a radiator, which uses a small six-row aluminum tube with aluminum fins for heat dissipation. The aluminum tubes and aluminum fins have a triangular structure and are arranged horizontally in an A-shape.

8. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 4, characterized in that, The input and output ends of the two circulating water pumps (105, 205) are connected in parallel through the water pump standby connecting valve (008).

9. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 4, characterized in that, The two circulating return water pipes (106, 206) and the two circulating water supply pipes (107, 207) are connected by expansion valves (009).

10. A peak cooling system with interleaved cross-arrangement of indirect cooling towers according to claim 1, characterized in that, Each of the mechanical ventilation cooling towers (104, 204) is connected to a buried water tank for draining water from the corresponding multiple cooling units, and the buried water tank is connected to the corresponding multiple cooling units.

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