A closed cooling water system with mixed cooling

Abstract

The utility model discloses a closed cooling water system with mixed cooling, including an air cooler, a water cooler, a closed cooling water pump and a closed cooling water user, wherein one side of the air cooler is connected to the closed cooling water pump through a pipeline, one side of the air cooler is connected to the closed cooling water user through a pipeline, one side of the water cooler is connected to the closed cooling water pump through a pipeline, one side of the water cooler is connected to the closed cooling water user through a pipeline, and one side of the closed cooling water pump is connected to the closed cooling water user through a pipeline. The closed cooling water system with mixed cooling uses a mixed cooling method to remove part of the heat of the closed cooling water by exchanging heat with the air, which can significantly reduce the power consumption and operating costs of the combined cycle unit during shutdown and standby.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling water systems, in particular to a closed cooling water system of mixed cooling. Background Art

[0002] The closed cooling water system is an efficient industrial cooling method that transfers cooling water through a closed cycle to reduce the temperature of the equipment. The advantages of this system include: reducing water evaporation and discharge, ensuring that the water quality is not polluted, and extending the service life of the equipment. In power plants, closed cooling water systems are mainly used to provide cooling water sources for auxiliary equipment of the unit to ensure the normal operation of auxiliary equipment and systems. At the same time, circulating water is used as a cold source to take away the heat of the closed cooling water in the shell and tube heat exchanger. Gas-steam combined cycle generator sets are becoming more and more popular due to their high efficiency, low pollution, and excellent grid peak-shaving performance. Precisely because of its excellent grid peak-shaving performance, combined cycle units often adopt a "two-shift" operation mode of daytime operation and nighttime operation in some receiving grids and grids with severe peak-to-valley differences. The units are started and stopped many times, the operating time is short, and the units are in a standby shutdown state for a long time.

[0003] After the combined cycle unit is shut down for a period of time, it is usually necessary to stop the shaft seal to break the vacuum, stop the condensate pump, and stop the circulating water pump to save power consumption. At this time, due to the high temperature of the turbine cylinder, the cranking operation must still be maintained, and the main oil system such as lubricating oil and top shaft oil cannot be shut down; in order to keep the compressed air running throughout the plant, the air compressor system cannot be shut down, etc. These systems still need a closed cooling water system to take away the generated heat. At this time, since the circulating water pump has been shut down, there is no circulating water as a cold source to cool the closed cooling water. The closed cooling water is constantly circulating to cool the oil system, air compressor and other auxiliary equipment, and its heat continues to accumulate and the temperature continues to rise.

[0004] Usually, the heat of the closed cooling water is removed by running the circulating water pump intermittently. However, since the circulating water pump is selected and designed according to the amount of cooling water required by the condenser and the closed cooler when the unit is running, even if 50% double pumps and frequency conversion are used for adjustment, the amount of cooling water of the circulating water pump is far greater than the amount of water required for cooling the closed cooling water of the closed cooler, resulting in a waste of power consumption in the plant. At present, after the combined cycle unit is shut down, the cooling method of the closed cooling water has the problem of high operating costs. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a closed cooling water system with mixed cooling, which solves the problem raised in the above background technology that since the circulating water pump is selected and designed according to the cooling water volume required by the condenser and the closed cooler when the unit is running, even if 50% double pumps and frequency conversion are used for adjustment, the cooling water volume of the circulating water pump is far greater than the water volume required for cooling the closed cooler, resulting in a waste of plant electricity. At present, after the combined cycle unit is shut down, the cooling method of the closed cooling water has the problem of high operating costs.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a closed cooling water system with mixed cooling, including an air cooler, a water cooler, a closed cooling water pump and a closed cooling water user, one side of the air cooler is connected to the closed cooling water pump through a pipeline, one side of the air cooler is connected to the closed cooling water user through a pipeline, one side of the water cooler is connected to the closed cooling water pump through a pipeline, one side of the water cooler is connected to the closed cooling water user through a pipeline, one side of the closed cooling water pump is connected to the closed cooling water user through a pipeline, the air cooler and the water cooler are connected in parallel, there is one air cooler, one water cooler, one closed cooling water pump, one closed cooling water user, and the air cooler is naturally ventilated.

[0007] Furthermore, both sides of the air cooler are connected to a bypass temperature regulating valve through a pipeline, which is used to partially or completely divert the closed cooling water entering the air cooler to adjust the closed cooling water temperature.

[0008] Furthermore, both sides of the water cooler are connected to a bypass temperature regulating valve through a pipeline, which is used to partially or completely divert the closed cooling water entering the water cooler to adjust the temperature of the closed cooling water.

[0009] Furthermore, one side of the closed cooling water pump is connected to a closed water tank through a pipe, and the closed water tank is connected to a water supply regulating valve through a pipe. An air cooler inlet valve and an air cooler outlet valve are provided on both sides of the air cooler for partially or fully controlling the closed cooling water entering the air cooler.

[0010] Furthermore, a water cooler inlet valve and a water cooler outlet valve are provided on both sides of the water cooler for partially or completely controlling the closed cooling water entering the water cooler.

[0011] Furthermore, the air cooler and the water cooler can be connected in series, there can be multiple air coolers, there can be multiple water coolers, there can be multiple closed cooling water pumps, there can be multiple closed cooling water users, and the air cooler can also be mechanically ventilated.

[0012] The utility model provides a closed cooling water system with mixed cooling, which has the following beneficial effects:

[0013] Closed cooling water is a cooling water mainly used to cool the auxiliary equipment of the unit, which forms a closed cycle through a closed cooling water pump, a closed cooler, and users. The closed cooling water in the original system absorbs the heat of the user and is taken away by the circulating water in the closed cooler. However, due to the operating mode of the combined cycle unit, after the combined cycle unit is shut down, the cooling method of the closed cooling water has the problem of high operating costs. The utility model uses a mixed cooling method to take away part of the heat of the closed cooling water by exchanging heat with the air, which can significantly reduce the plant power consumption and operating costs during the shutdown and standby period of the combined cycle unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the system flow of Example 1 of the utility model;

[0015] Figure 2 This is a schematic diagram of the system flow of Example 2 of the present utility model;

[0016] Figure 3 This is a schematic diagram of the system flow of Example 3 of the present utility model.

[0017] In the figure: 1. air cooler; 2. water cooler; 3. bypass thermostatic valve; 4. closed cooling water pump; 5. closed cooling water user; 6. closed water tank; 7. water supply regulating valve; 101. air cooler outlet valve; 102. air cooler inlet valve; 201. water cooler outlet valve; 202. water cooler inlet valve; 11. second air cooler; 111. second air cooler outlet valve; 112. second air cooler inlet valve; 21. second water cooler; 211. water cooler outlet valve; 212. water cooler inlet valve; 31. second bypass thermostatic valve. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0019] like Figures 1 to 3As shown, the utility model provides a technical solution: a closed cooling water system of mixed cooling, comprising an air cooler 1, a water cooler 2, a closed cooling water pump 4 and a closed cooling water user 5, one side of the air cooler 1 is connected to the closed cooling water pump 4 through a pipeline, one side of the air cooler 1 is connected to the closed cooling water user 5 through a pipeline, one side of the water cooler 2 is connected to the closed cooling water pump 4 through a pipeline, one side of the water cooler 2 is connected to the closed cooling water user 5 through a pipeline, one side of the closed cooling water pump 4 is connected to the closed cooling water user 5 through a pipeline, the air cooler 1 and the water cooler 2 are connected in parallel, there is one air cooler 1, one water cooler 2, one closed cooling water pump 4, and one closed cooling water user 5, the air cooler 1 is in a natural ventilation mode, the air cooler 1 and the water cooler 2 can also be connected in series, there can be multiple air coolers 1, there can be multiple water coolers 2, there can be multiple closed cooling water pumps 4, there can be multiple closed cooling water users 5, and the air cooler 1 can also be in a mechanical ventilation mode.

[0020] Both sides of the air cooler 1 are connected to the bypass temperature regulating valve 3 through pipelines, which are used to partially or completely divert the closed cooling water entering the air cooler 1 to adjust the closed cooling water temperature.

[0021] Both sides of the water cooler 2 are connected to the bypass temperature regulating valve 3 through pipelines, which are used to partially or completely divert the closed cooling water entering the water cooler 2 to adjust the closed cooling water temperature.

[0022] One side of the closed cooling water pump 4 is connected to the closed water tank 6 through a pipeline, and the closed water tank 6 is connected to the water supply regulating valve 7 through a pipeline. An air cooler inlet valve 102 and an air cooler outlet valve 101 are provided on both sides of the air cooler 1 for partially or completely controlling the closed cooling water entering the air cooler 1.

[0023] A water cooler inlet valve 202 and a water cooler outlet valve 201 are provided on both sides of the water cooler 2 for partially or completely controlling the closed cooling water entering the water cooler 2 .

[0024] In Example 1, the closed cooling water after cooling the user 5 is pressurized by the closed cooling water pump 4 and flows through the parallel air cooler 1, water cooler 2, and bypass thermostatic valve 3. The air cooler 1 can take away the heat of the closed cooling water by exchanging heat with the air, and the water cooler 2 can take away the heat of the closed cooling water by exchanging heat with the circulating water. The bypass thermostatic valve 3 controls the temperature of the closed cooling water after cooling by adjusting the opening.

[0025] Embodiment 2, compared with embodiment 1, this embodiment adds an air cooler outlet valve 101; an air cooler inlet valve 102; a water cooler outlet valve 201; a water cooler inlet valve 202; a second water cooler 21; a water cooler outlet valve 211; and a water cooler inlet valve 212. One or more water coolers 21 can be configured, and the opening, closing, and adjustment of the respective inlet valves and outlet valves can be performed to meet different requirements of operation and maintenance.

[0026] In Example 3, compared with Example 2, the air cooler 1 and the water cooler 2 are arranged in series, and a corresponding second bypass thermostatic valve is added to adjust the temperature of the closed cooling water after being cooled by the air cooler. In this example, the hot closed cooling water is first cooled by the air cooler and then by the water cooler, which reduces the heat carried away by the circulating water and can also reduce the power consumption of the plant when the unit is running.

Claims

1. A closed cooling water system for mixed cooling, comprising an air cooler (1), a water cooler (2), a closed cooling water pump (4) and a closed cooling water user (5), characterized in that: One side of the air cooler (1) is connected to a closed cooling water pump (4) through a pipeline, and one side of the air cooler (1) is connected to a closed cooling water user (5) through a pipeline. One side of the water cooler (2) is connected to a closed cooling water pump (4) through a pipeline, and one side of the water cooler (2) is connected to a closed cooling water user (5) through a pipeline. One side of the closed cooling water pump (4) is connected to a closed cooling water user (5) through a pipeline. The air cooler (1) and the water cooler (2) are connected in parallel. There is one air cooler (1), one water cooler (2), one closed cooling water pump (4), and one closed cooling water user (5). The air cooler (1) is naturally ventilated.

2. A closed cooling water system for mixed cooling according to claim 1, characterized in that: Both sides of the air cooler (1) are connected to a bypass temperature regulating valve (3) through pipelines, which are used to partially or completely divert the closed cooling water entering the air cooler (1) to adjust the closed cooling water temperature.

3. A closed cooling water system for mixed cooling according to claim 2, characterized in that: Both sides of the water cooler (2) are connected to a bypass temperature regulating valve (3) through pipelines, which are used to partially or completely divert the closed cooling water entering the water cooler (2) to adjust the closed cooling water temperature.

4. A closed cooling water system for mixed cooling according to claim 3, characterized in that: One side of the closed cooling water pump (4) is connected to a closed water tank (6) via a pipeline, and the closed water tank (6) is connected to a water supply regulating valve (7) via a pipeline. An air cooler inlet valve (102) and an air cooler outlet valve (101) are provided on both sides of the air cooler (1) for partially or completely controlling the closed cooling water entering the air cooler (1).

5. A closed cooling water system for mixed cooling according to claim 1, characterized in that: A water cooler inlet valve (202) and a water cooler outlet valve (201) are provided on both sides of the water cooler (2) for partially or completely controlling the closed cooling water entering the water cooler (2).

6. A closed cooling water system for mixed cooling according to claim 1, characterized in that: The air cooler (1) and the water cooler (2) can also be connected in series, the air cooler (1) can be multiple, the water cooler (2) can be multiple, the closed cooling water pump (4) can be multiple, the closed cooling water user (5) can be multiple, and the air cooler (1) can also be mechanically ventilated.

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