Multifunctional water supply system

Abstract

The invention discloses a multifunctional water supply system. The system comprises a circulating water forebay, a first circulating water flow channel and a second circulating water flow channel, the first circulating water flow channel and the second circulating water flow channel are arranged on the circulating water forebay, a first movable type flow channel drainage pump and a second movable type flow channel drainage pump are arranged in the first circulating water flow channel and the second circulating water flow channel respectively, and a second pipeline is arranged between the first circulating water flow channel and the second circulating water flow channel. A first gate valve and a second gate valve are arranged at the two ends of the second pipeline respectively, a water outlet of the first movable flow channel drainage pump is used for being communicated with a first gate valve drainage port, and a water outlet of the second movable flow channel drainage pump is used for being communicated with a second gate valve drainage port. When the circulating water pump is overhauled, water in the flow channel can be pumped to the adjacent flow channel for use only through cooperation of one pipeline and the corresponding movable flow channel drainage pump, waste of water resources is avoided, and the equipment investment cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of water supply in thermal power plants, and in particular relates to a multifunctional water supply system. Background Art

[0002] The design of the circulating cooling water system is an important topic in the configuration of the cooling system of a thermal power plant. Whether the layout design of the cooling tower, circulating water pump, condenser and circulating water pipe trench in the circulating cooling water system is reasonable has an important impact on the safe and economical operation of the power plant. In the current design of the water supply system of a power plant, a submersible pump is often designed to drain the water in the circulating flow channel during the maintenance of the circulating water pump. Two drainage pipes and corresponding submersible pumps are required for the two circulating flow channels, and the pipeline layout is complex, the consumables are large, and the cost is high. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and provide a multifunctional water supply system to achieve the advantages of material saving and low cost.

[0004] The technical solution adopted by the present invention is: a multifunctional water supply system, comprising a circulating water forepool, a first circulating water flow channel and a second circulating water flow channel arranged on the circulating water forepool, the first circulating water flow channel is separated from the circulating water forepool by a first gate, and the second circulating water flow channel is separated from the circulating water forepool by a second gate; a first circulating water pump and a second circulating water pump are respectively arranged in the first circulating water flow channel and the second circulating water flow channel, the pipeline outlets of the first circulating water pump and the second circulating water pump are both connected to one end of the steam turbine generator condenser and one end of the auxiliary machine heat exchanger through the first pipeline, the other end of the steam turbine generator condenser and the other end of the auxiliary machine heat exchanger are both connected to the circulating water forepool through the circulating pipeline, and a cooling tower is arranged on the circulating pipeline;

[0005] A first mobile channel drainage pump and a second mobile channel drainage pump are respectively provided in the first circulating water channel and the second circulating water channel, a second pipeline is provided between the first circulating water channel and the second circulating water channel, a first gate valve and a second gate valve are respectively provided at both ends of the second pipeline, a water outlet of the first mobile channel drainage pump is used to communicate with the first gate valve drainage outlet, and a water outlet of the second mobile channel drainage pump is used to communicate with the second gate valve drainage outlet.

[0006] Furthermore, it also includes a third pipeline, one end of the third pipeline is connected to the second pipeline, the other end of the third pipeline is connected to the first pipeline, and a third gate valve is provided on the third pipeline.

[0007] Furthermore, it also includes a fourth pipeline, one end of which is connected to the cooling water inlets of the first circulating water pump and the second circulating water pump, and the other end of the fourth pipeline is connected to the first pipeline, and a fourth gate valve is provided on the fourth pipeline.

[0008] Furthermore, a first valve is provided at one end of the first pipeline connected to the first circulating water pump, and a second valve is provided at one end of the first pipeline connected to the second circulating water pump.

[0009] Furthermore, a third valve is provided at one end of the first pipeline connected to the condenser of the steam turbine generator; and a fifth valve is provided at one end of the first pipeline connected to the auxiliary machine heat exchanger.

[0010] Furthermore, a fourth valve is provided at one end of the circulation pipeline connected to the condenser of the steam turbine generator; a sixth valve is provided at one end of the circulation pipeline connected to the auxiliary machine heat exchanger.

[0011] The beneficial effects of the present invention are:

[0012] The present invention has great advantages in reducing the engineering cost of the circulating water system and ensuring the safe and economical operation of the circulating water system:

[0013] 1) The present invention sets a second pipeline between the first circulating water flow channel and the second circulating water flow channel, and designs a mobile flow channel drainage pump. When the circulating water pump is overhauled, the water in the flow channel can be pumped to the adjacent flow channel for utilization only through one pipeline in cooperation with the corresponding mobile flow channel drainage pump, thereby avoiding the waste of water resources, improving the utilization efficiency of the water pump, and reducing the equipment investment cost.

[0014] 2) The present invention sets a third bypass pipe between the circulating water flow and the turbine generator condenser and the auxiliary heat exchanger. When the unit is shut down and the turbine generator condenser is shut down, the amount of cooling water required by the auxiliary heat exchanger that cannot be shut down is small, and a small-flow flow channel drainage pump can be started, that is, the third pipe, the third gate valve and the corresponding mobile flow channel drainage pump are coordinated to achieve this. There is no need to start a large-flow circulating water pump, which saves electricity consumption and reduces the energy consumption of the power plant.

[0015] 3) The present invention sets a bypass fourth pipe at the cooling water inlet of the circulating water pump, and cooperates with the third pipe, the fourth pipe and the corresponding mobile flow channel drainage pump to provide motor cooling water and bearing lubricating water when the circulating water pump is started, saving industrial water pumps and industrial water pipes and reducing engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the principle of the present invention.

[0017] In the figure, 1-the first gate; 2-the second gate; 3-the mobile flow channel drainage pump; 4-the first gate valve; 5-the second gate valve; 6-the first pipeline; 7-the third gate valve; 8-the fourth gate valve; 9-the second pipeline; 10-the first circulating water pump; 11-the second circulating water pump; 12-the first valve; 13-the second valve; 14-the third valve; 15-the turbine generator condenser; 16-the fourth valve; 17-the fifth valve; 18-the auxiliary machine heat exchanger; 19-the sixth valve; 20-the circulating pipeline; 21-the cooling tower, 22-the first circulating water flow channel; 23-the second circulating water flow channel; 24-the circulating water forepool; 25-the third pipeline; 26-the fourth pipeline. DETAILED DESCRIPTION

[0018] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] like Figure 1 As shown, the present invention provides a multifunctional water supply system, including a circulating water forepool 24, a first circulating water flow channel 22 and a second circulating water flow channel 23 which are arranged on the circulating water forepool 24 and separated from each other, wherein the first circulating water flow channel 22 is separated from the circulating water forepool 24 by a first gate 1, and the second circulating water flow channel 23 is separated from the circulating water forepool 24 by a second gate 2; a first circulating water pump 10 and a second circulating water pump 11 are respectively arranged in the first circulating water flow channel 22 and the second circulating water flow channel 23, and the pipeline outlets of the first circulating water pump 10 and the second circulating water pump 11 are both connected to the steam turbine generator through a first pipeline 6. One end of the motor condenser 15 is connected to one end of the auxiliary machine heat exchanger 18, and the other end of the steam turbine generator condenser 15 and the other end of the auxiliary machine heat exchanger 18 are connected to the circulating water forepool 24 through the circulating pipe 20, and a cooling tower 21 is arranged on the circulating pipe 20; the first pipe 6 includes a main pipe 6.1 and four branch pipes 6.2-6.5 located at both ends of the main pipe, the pipe outlets of the first circulating water pump 10 and the second circulating water pump 11 are respectively connected to two branch pipes 6.2 and 6.3, and one end of the steam turbine generator condenser 15 and one end of the auxiliary machine heat exchanger 18 are respectively connected to two branch pipes 6.4 and 6.5.

[0020] The first circulating water channel 22 and the second circulating water channel 23 are respectively provided with a first mobile channel drainage pump 3.1 and a second mobile channel drainage pump 3.2, a second pipeline 9 is provided between the first circulating water channel 3.1 and the second circulating water channel 3.2, and a first gate valve 4 and a second gate valve 5 are respectively provided at both ends of the second pipeline 9, the water outlet of the first mobile channel drainage pump 3.1 is used to communicate with the pipeline of the drainage outlet of the first gate valve 4, and the water outlet of the second mobile channel drainage pump 3.2 is used to communicate with the pipeline of the drainage outlet of the second gate valve 5, that is, the positive Normally, the first mobile channel drainage pump 3.1 and the second mobile channel drainage pump 3.2 are arranged independently, and are not connected to the pipeline of the drainage port of the first gate valve 4 and the pipeline of the drainage port of the second gate valve 5. They are connected when needed. For example, when the first gate valve 4 is not connected to the first mobile channel drainage pump 3.1, it can drain water into the first circulating water channel 22 through the first gate valve 4; when it is connected to the first mobile channel drainage pump 3.1, the water in the first circulating water channel 22 can be pumped out through the first mobile channel drainage pump 3.1. The first mobile channel drainage pump 3.1 and the second mobile channel drainage pump 3.2 can be the same water pump or two water pumps. When they are the same water pump, it is the first mobile channel drainage pump 3.1 when placed in the first circulating water channel 22, and it is the second mobile channel drainage pump 3.2 when placed in the second circulating water channel 23.

[0021] The present invention sets a second pipeline 9 between the first circulating water flow channel 22 and the second circulating water flow channel 23, and designs a mobile flow channel drainage pump 3. When the circulating water pump is repaired, the water in the flow channel can be pumped to the adjacent flow channel for utilization only through one pipeline in cooperation with the corresponding mobile flow channel drainage pump, thereby avoiding the waste of water resources, improving the utilization efficiency of the water pump, and reducing the equipment investment cost.

[0022] As a preferred solution, a third pipeline 25 is further included, one end of the third pipeline 25 is connected to the second pipeline 9 (i.e., the position between the first gate valve 4 and the second gate valve 5), the other end of the third pipeline 25 is connected to the main pipeline 6.1 of the first pipeline 6, and a third gate valve 7 is arranged on the third pipeline 25. In the present invention, a bypass third pipeline 25 is arranged between the circulating water flow to the steam turbine generator condenser 15 and the auxiliary machine heat exchanger 18. When the steam turbine generator condenser 15 is shut down, the amount of cooling water required by the auxiliary machine heat exchanger 18 that cannot be shut down is small, and a small flow channel drainage pump can be started, that is, the third pipeline 25, the third gate valve 7 and the corresponding mobile flow channel drainage pump are coordinated to achieve the realization, without starting a large flow circulating water pump, saving electric energy consumption and reducing the energy consumption of the power plant.

[0023] As a preferred solution, it also includes a fourth pipeline 26, one end of which is connected to the cooling water inlet of the first circulating water pump 10 and the second circulating water pump 11, and the other end of the fourth pipeline 26 is connected to the main pipeline 6.1 of the first pipeline 6, and a fourth gate valve 8 is provided on the fourth pipeline 26. The present invention sets a bypass fourth pipeline 26 at the cooling water inlet of the circulating water pump, and cooperates with the third pipeline 25, the fourth pipeline 26 and the corresponding mobile flow channel drainage pump to provide motor cooling water and bearing lubricating water when the circulating water pump is started, saving industrial water pumps and industrial water pipelines, and reducing engineering costs.

[0024] As a preferred solution, the first circulating water pump 10, the second circulating water pump 11, the steam turbine generator condenser 15, and the auxiliary machine heat exchanger 18 can be provided with valves themselves. For better control, independent valves can also be set on the corresponding pipelines, such as a first valve 12 is set at one end of the first pipeline 6 connected to the first circulating water pump 10 (i.e., on the branch pipeline 6.2), and a second valve 13 is set at one end of the first pipeline 6 connected to the second circulating water pump 11 (i.e., on the branch pipeline 6.3); a third valve 14 is set at one end of the first pipeline 6 connected to the steam turbine generator condenser 15 (i.e., on the branch pipeline 6.4), and a fifth valve 17 is set at one end of the first pipeline 6 connected to the auxiliary machine heat exchanger 18 (i.e., on the branch pipeline 6.5); a fourth valve 16 is set at one end of the circulation pipeline 20 connected to the steam turbine generator condenser 15, and a sixth valve 19 is set at one end of the circulation pipeline 20 connected to the auxiliary machine heat exchanger 18.

[0025] The implementation principle of the present invention is as follows:

[0026] 1. When the first circulating water pump 10 needs to be overhauled, close the first gate 1, the third gate valve 7, and the fourth gate valve 8, open the first gate valve 4 and the second gate valve 5, connect the first mobile flow channel drainage pump 3.1 with the drainage port of the first gate valve 4, and start the first mobile flow channel drainage pump 3.1, pump the water in the first circulating water flow channel 22 to the second circulating water flow channel 23 through the first gate valve 4, the second pipeline 9 and the second gate valve 5, and drain the first circulating water flow channel 23, so as to facilitate the overhaul of the first circulating water pump 10 and the cleaning of the first circulating water flow channel 22; when the second circulating water pump 11 needs to be overhauled, close the first gate valve 4 and the second gate valve 5, and ... and pump the water in the first circulating water flow channel 22 to the second circulating water flow channel 23 through the first gate valve 4, the second pipeline 9 and the second gate valve 5, and drain the first circulating water flow channel 23, so as to facilitate the overhaul of the first circulating water pump 10 and the cleaning of the first circulating water flow channel 22; The second gate 2, the third gate valve 7, the fourth gate valve 8, open the first gate valve 4 and the second gate valve 5, connect the second mobile flow channel drainage pump 3.2 with the drainage port of the second gate valve 5, and start the second mobile flow channel drainage pump 3.2, pump the water in the second circulating water flow channel 23 to the first circulating water flow channel 22 through the second gate valve 5, the second pipeline 9 and the first gate valve 4, and drain the second circulating water flow channel 23, which is convenient for the maintenance of the second circulating water pump 11 and the cleaning of the second circulating water flow channel 23. At the same time, the water in the first circulating water flow channel 22 and the second circulating water flow channel 23 can be reused, avoiding the waste of water resources.

[0027] 2. When the unit is shut down, the turbine generator condenser 15 is shut down, the third valve 14 and the fourth valve 16 are closed, the fifth valve 17 and the sixth valve 19 are in the open state, the first mobile flow channel drainage pump 3.1 is connected with the first gate valve 4, and the first mobile flow channel drainage pump 3.1, the first gate valve 4, and the third gate valve 7 are opened, the second gate valve 5, the fourth gate valve 8, the first circulating water pump 10, and the second circulating water pump 11 are closed, and cooling water is provided to the auxiliary machine heat exchanger 18 that cannot be shut down through the third pipeline 25; or the second mobile flow channel drainage pump 3.2 is connected with the second gate valve 5, and the second mobile flow channel drainage pump 3.2, the second gate valve 5, and the third gate valve 7 are opened, the first gate valve 3.1, the fourth gate valve 8, the first circulating water pump 10, and the second circulating water pump 11 are closed, and cooling water is provided to the auxiliary machine heat exchanger 18 that cannot be shut down through the third pipeline 25, so as to achieve the purpose of achieving a small cooling water demand through a small flow water pump, thereby saving power consumption.

[0028] 3. When the first circulating water pump 10 and the second circulating water pump 11 are started, the motor and bearings of the circulating water pump need cooling water and lubricating water. At this time, the first mobile flow channel drainage pump 3.1 can be connected with the first gate valve 4, and the first mobile flow channel drainage pump 3.1, the first gate valve 4, the third gate valve 7, and the fourth gate valve 8 are opened, and the second gate valve 5 is closed, and the circulating water pump motor cooling water and bearing lubricating water are transported to the circulating water pump motor and bearings through the second pipeline 9, the third pipeline 25, and the fourth pipeline 26; or the second mobile flow channel drainage pump 3.2 is connected with the second gate valve 5, and the second mobile flow channel drainage pump 3.2, the second gate valve 5, the third gate valve 7, and the fourth gate valve 8 are opened, and the first gate valve 4 is closed, and the circulating water pump motor cooling water and bearing lubricating water are transported to the circulating water pump motor and bearings through the second pipeline 9, the third pipeline 25, and the fourth pipeline 26. The industrial water pump is eliminated to provide the circulating water pump motor cooling water and bearing lubricating water, saving industrial water pumps and industrial water pipelines, and reducing the project cost.

[0029] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A multifunctional water supply system, characterized in that: The invention comprises a circulating water forepool (24), a first circulating water flow channel (22) and a second circulating water flow channel (23) arranged on the circulating water forepool, wherein the first circulating water flow channel (22) is separated from the circulating water forepool (24) by a first gate (1), and the second circulating water flow channel (23) is separated from the circulating water forepool (24) by a second gate (2); a first circulating water pump (10) and a second circulating water pump (11) are respectively arranged in the first circulating water flow channel (22) and the second circulating water flow channel (23), and the pipeline outlets of the first circulating water pump (10) and the second circulating water pump (11) are both connected to one end of a steam turbine generator condenser (15) and one end of an auxiliary machine heat exchanger (18) through a first pipeline (6), and the other end of the steam turbine generator condenser (15) and the other end of the auxiliary machine heat exchanger (18) are both connected to the circulating water forepool (24) through a circulating pipeline (20), and a cooling tower (21) is arranged on the circulating pipeline (20); A first mobile channel drainage pump (3.1) and a second mobile channel drainage pump (3.2) are respectively provided in the first circulating water channel (22) and the second circulating water channel (23); a second pipeline (9) is provided between the first circulating water channel (22) and the second circulating water channel (23); a first gate valve (4) and a second gate valve (5) are respectively provided at both ends of the second pipeline (9); a water outlet of the first mobile channel drainage pump (3.1) is used to communicate with a drainage outlet of the first gate valve (4); and a water outlet of the second mobile channel drainage pump (3.2) is used to communicate with a drainage outlet of the second gate valve (5).

2. The multifunctional water supply system according to claim 1, characterized in that: The invention also comprises a third pipeline (25), one end of which is in communication with the second pipeline (9), and the other end of which is in communication with the first pipeline (6). A third gate valve (7) is provided on the third pipeline (25).

3. The multifunctional water supply system according to claim 1, characterized in that: It also includes a fourth pipeline (26), one end of which is connected to the cooling water inlets of the first circulating water pump (10) and the second circulating water pump (11), and the other end of which is connected to the first pipeline (6). A fourth gate valve (8) is provided on the fourth pipeline (26).

4. The multifunctional water supply system according to claim 1, characterized in that: A first valve (12) is provided at one end of the first pipeline (6) that is connected to the first circulating water pump (10).

5. The multifunctional water supply system according to claim 1, characterized in that: A second valve (13) is provided at one end of the first pipeline (6) that is connected to the second circulating water pump (11).

6. The multifunctional water supply system according to claim 1, characterized in that: A third valve (14) is provided at one end of the first pipeline (6) communicating with the turbine generator condenser (15).

7. The multifunctional water supply system according to claim 1, characterized in that: A fifth valve (17) is provided at one end of the first pipeline (6) communicating with the auxiliary machine heat exchanger (18).

8. The multifunctional water supply system according to claim 1, characterized in that: A fourth valve (16) is provided at one end of the circulation pipeline (20) communicating with the turbine generator condenser (15).

9. The multifunctional water supply system according to claim 1, characterized in that: A sixth valve (19) is provided at one end of the circulation pipeline (20) communicating with the auxiliary machine heat exchanger (18).

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