A seawater desalination water intake system and water intake method for a nuclear power plant

Abstract

This invention belongs to the field of nuclear power plant seawater desalination technology, specifically relating to a nuclear power plant seawater desalination system and its water intake method, including: a water intake tunnel, a plant forebay, a No. 3 circulating water pump, a No. 3 condenser, a No. 3 drainage tunnel, a No. 3 gate well, a No. 4 circulating water system, a No. 4 condenser, a No. 4 drainage tunnel, a No. 4 gate well, a seawater desalination system, a floating water intake facility, a No. 3 gate well water intake pumping station, a No. 4 gate well water intake pumping station, a seawater desalination system water supply pipe, and several pipelines; the water intake system of this invention, by taking water from the warm wastewater of the unit, can effectively increase the water intake temperature, reduce the content of silt and marine organisms, thereby improving the seawater desalination efficiency.

Description

Technical Field

[0001] This invention belongs to the field of seawater desalination technology for nuclear power plants, specifically relating to a seawater desalination system for nuclear power plants and its water intake method. Background Technology

[0002] Currently, the seawater used in the desalination process of nuclear power plants is drawn directly from the ocean through water intake facilities such as floating ships. This method has the following disadvantages:

[0003] 1) Seawater temperature changes with ambient temperature, which can cause the reverse osmosis membrane in the reverse osmosis seawater desalination process to be unable to work within the high-efficiency water production temperature range, thereby reducing the efficiency of seawater desalination.

[0004] 2) Seawater taken directly from the sea has a high content of sediment and marine organisms, which requires high-level seawater pretreatment technology. It requires a large amount of clarification and pretreatment equipment to pretreat the seawater, which increases the number of seawater desalination equipment and reduces the overall efficiency of the seawater desalination process.

[0005] Therefore, it is necessary to design a seawater desalination water intake system and its water intake method for nuclear power plants to improve the existing seawater desalination facilities of nuclear power plants and increase the seawater desalination efficiency without adding too many other seawater desalination treatment equipment. Summary of the Invention

[0006] This invention relates to a seawater desalination system and method for nuclear power plants, which addresses the technical problem of low desalination efficiency in existing nuclear power plants that directly extract seawater from the ocean for desalination.

[0007] The technical solution of the present invention:

[0008] A seawater desalination water intake system for a nuclear power plant includes: a water intake tunnel, a forebay, a No. 3 circulating water pump, a No. 3 condenser, a No. 3 drainage tunnel, a No. 3 gate well, a No. 4 circulating water system, a No. 4 condenser, a No. 4 drainage tunnel, a No. 4 gate well, a seawater desalination system, a floating water intake facility, a No. 3 gate well water intake pumping station, a No. 4 gate well water intake pumping station, a seawater desalination system water supply pipe, and several pipelines.

[0009] The water intake tunnel is connected to the plant's forebay via pipelines. The forebay is connected to circulating water pumps No. 3 and No. 4, as well as a floating water intake facility. Circulating water pump No. 3 is connected to one end of condenser No. 3 via pipelines, and the other end of condenser No. 3 is connected to gate well No. 3 via pipelines. Gate well No. 3 is also connected to the gate well water intake pumping station via pipelines. A drainage tunnel No. 3 is also provided between condenser No. 3 and gate well No. 3. The gate well water intake pumping station is connected to the seawater desalination system via pipelines.

[0010] The No. 4 circulating water pump is connected to one end of the No. 4 condenser via a pipeline, and the other end of the No. 4 condenser is connected to the No. 4 gate well via a pipeline. The No. 4 gate well is also connected to the No. 4 gate well water intake pumping station via a pipeline. A No. 4 drainage tunnel is also provided between the No. 4 condenser and the No. 4 gate well. The No. 4 gate well water intake pumping station is connected to the seawater desalination system via a pipeline.

[0011] The floating water intake facility is connected to the seawater desalination system via pipelines;

[0012] The seawater desalination system is equipped with a seawater desalination system water supply pipe.

[0013] The pipeline connecting the No. 3 gate well water intake pumping station and the seawater desalination system is equipped with a No. 3 gate well water intake manifold shut-off valve A, a No. 3 gate well water intake system manifold pressure gauge, and a No. 3 gate well water intake system manifold shut-off valve B, respectively. One end of the No. 3 gate well water intake manifold shut-off valve A is connected to the No. 3 gate well water intake pumping station, and the other end of the No. 3 gate well water intake manifold shut-off valve A is connected to the No. 3 gate well water intake system manifold shut-off valve B. A No. 3 gate well water intake system manifold pressure gauge is installed between the No. 3 gate well water intake manifold shut-off valve A and the No. 3 gate well water intake system manifold shut-off valve B.

[0014] The No. 3 gate well water intake pumping station includes three gate well water intake branches: No. 3 gate well water intake branch A, No. 3 gate well water intake branch B and No. 3 gate well water intake branch C.

[0015] The No. 3 gate well water intake branches A, B, and C are connected in parallel, and the three gate well water intake branches in the No. 3 gate well water intake pumping station operate in a two-in-use, one-standby mode. When any two gate well water intake branches in the No. 3 gate well water intake pumping station are running in parallel, the total water supply of the pumps is 3900 m³. 3 / h, with a head of 38m.

[0016] The No. 3 gate well water intake branch A includes: No. 3 gate well water intake pump A, No. 3 gate well water intake pump A outlet pressure gauge, No. 3 gate well water intake pump A outlet check valve, and No. 3 gate well water intake pump A outlet electric valve. The inlet of No. 3 gate well water intake pump A is connected to the No. 3 gate well via a pipeline, and the outlet of No. 3 gate well water intake pump A is sequentially connected via a pipeline to the No. 3 gate well water intake pump A outlet pressure gauge, No. 3 gate well water intake pump A outlet check valve, and No. 3 gate well water intake pump A outlet electric valve. The No. 3 gate well water intake pump A outlet electric valve is also connected to the No. 3 gate well water intake manifold shut-off valve A via a pipeline.

[0017] The No. 3 gate well water intake branch B includes: No. 3 gate well water intake pump B, No. 3 gate well water intake pump B outlet pressure gauge, No. 3 gate well water intake pump B outlet check valve, and No. 3 gate well water intake pump B outlet electric valve; the inlet of No. 3 gate well water intake pump B3 is connected to the No. 3 gate well via a pipeline, and the outlet of No. 3 gate well water intake pump B3 is sequentially connected via a pipeline to the No. 3 gate well water intake pump B outlet pressure gauge, No. 3 gate well water intake pump B outlet check valve, and No. 3 gate well water intake pump B outlet electric valve; the No. 3 gate well water intake pump B outlet electric valve is also connected to the No. 3 gate well water intake manifold shut-off valve A via a pipeline.

[0018] The No. 3 gate well water intake branch C includes: No. 3 gate well water intake pump C, No. 3 gate well water intake pump C outlet pressure gauge, No. 3 gate well water intake pump C outlet check valve 3, and No. 3 gate well water intake pump C outlet electric valve; the inlet of No. 3 gate well water intake pump C is connected to the No. 3 gate well via a pipeline, and the outlet of No. 3 gate well water intake pump C is sequentially connected via a pipeline to the No. 3 gate well water intake pump C outlet pressure gauge, No. 3 gate well water intake pump C outlet check valve, and No. 3 gate well water intake pump C outlet electric valve; the No. 3 gate well water intake pump C outlet electric valve is also connected to the No. 3 gate well water intake manifold shut-off valve A via a pipeline.

[0019] The pipeline connecting the No. 4 gate well water intake pumping station and the seawater desalination system is equipped with a No. 4 gate well water intake manifold shut-off valve A, a No. 4 gate well water intake system manifold pressure gauge, and a No. 4 gate well water intake system manifold shut-off valve B. One end of the No. 4 gate well water intake manifold shut-off valve A is connected to the No. 4 gate well water intake pumping station, and the other end of the No. 4 gate well water intake manifold shut-off valve A is connected to the No. 4 gate well water intake system manifold shut-off valve B. A No. 4 gate well water intake system manifold pressure gauge 4 is installed between the No. 4 gate well water intake manifold shut-off valve A and the No. 4 gate well water intake system manifold shut-off valve B.

[0020] The No. 4 gate well water intake pumping station includes three gate well water intake branches: No. 4 gate well water intake branch A, No. 4 gate well water intake branch B and No. 4 gate well water intake branch C.

[0021] The No. 4 gate well water intake branches A, B, and C are connected in parallel, and the three gate well water intake branches in the No. 4 gate well water intake pumping station operate in a two-in-use, one-standby mode. When any two gate well water intake branches in the No. 4 gate well water intake pumping station are running in parallel, the total water supply of the pumps is 3900 m³. 3 / h, with a head of 38m.

[0022] The No. 4 gate well water intake branch A includes: No. 4 gate well water intake pump A41, No. 4 gate well water intake pump A outlet pressure gauge, No. 4 gate well water intake pump A outlet check valve, and No. 4 gate well water intake pump A outlet electric valve; the inlet of No. 4 gate well water intake pump A is connected to the No. 4 gate well via a pipeline, and the outlet of No. 4 gate well water intake pump A is sequentially connected via a pipeline to the No. 4 gate well water intake pump A outlet pressure gauge, No. 4 gate well water intake pump A outlet check valve, and No. 4 gate well water intake pump A outlet electric valve; the No. 4 gate well water intake pump A outlet electric valve is also connected to the No. 4 gate well water intake manifold shut-off valve A53 via a pipeline;

[0023] The No. 4 gate well water intake branch B includes: No. 4 gate well water intake pump B, No. 4 gate well water intake pump B outlet pressure gauge, No. 4 gate well water intake pump B outlet check valve, and No. 4 gate well water intake pump B outlet electric valve; the inlet of No. 4 gate well water intake pump B is connected to the No. 4 gate well via a pipeline, and the outlet of No. 4 gate well water intake pump B is sequentially connected via a pipeline to the No. 4 gate well water intake pump B outlet pressure gauge, No. 4 gate well water intake pump B outlet check valve, and No. 4 gate well water intake pump B outlet electric valve; the No. 4 gate well water intake pump B outlet electric valve is also connected to the No. 4 gate well water intake manifold shut-off valve A via a pipeline.

[0024] The No. 4 gate well water intake branch C includes: No. 4 gate well water intake pump C, No. 4 gate well water intake pump C outlet pressure gauge, No. 4 gate well water intake pump C outlet check valve, and No. 4 gate well water intake pump C outlet electric valve; the inlet of No. 4 gate well water intake pump C is connected to the No. 4 gate well via a pipeline, and the outlet of No. 4 gate well water intake pump C is sequentially connected via a pipeline to the No. 4 gate well water intake pump C outlet pressure gauge, No. 4 gate well water intake pump C outlet check valve, and No. 4 gate well water intake pump C outlet electric valve; the No. 4 gate well water intake pump C outlet electric valve is also connected to the No. 4 gate well water intake manifold shut-off valve A via a pipeline.

[0025] The floating water intake facility and the seawater desalination system are respectively equipped with a floating water intake system manifold shut-off valve A, a floating water intake system manifold pressure gauge and a floating water intake system manifold shut-off valve B on the pipeline connecting the floating water intake facility and the seawater desalination system.

[0026] One end of the floating water intake system manifold shut-off valve A is connected to the floating water intake facility, and the other end of the floating water intake system manifold shut-off valve A is connected to the floating water intake system manifold shut-off valve B. A floating water intake system manifold pressure gauge is installed between the floating water intake system manifold shut-off valve A and the floating water intake system manifold shut-off valve B.

[0027] The floating water intake facility includes three floating water intake branches: floating water intake branch A, floating water intake branch B, and floating well water intake branch C.

[0028] The floating water intake branch A, floating water intake branch B, and floating well water intake branch C are connected in parallel. The three floating water intake branches within the floating water intake facility operate in a two-in-use, one-standby mode. When any two floating water intake branches are connected in parallel, the total water supply from the pumps is 3900 m³. 3 / h.

[0029] The floating water intake branch A includes: a floating water intake pump A, an outlet pressure gauge for the floating water intake pump A, an outlet check valve for the floating water intake pump A, and an outlet electric valve for the floating water intake pump A. The inlet of the floating water intake pump A is connected to the floating system via a pipeline, and the outlet of the floating water intake pump A is sequentially connected via a pipeline to the outlet pressure gauge for the floating water intake pump A, the outlet check valve for the floating water intake pump A, and the outlet electric valve for the floating water intake pump A. The outlet electric valve for the floating water intake pump A is also connected to the floating water intake manifold shut-off valve A via a pipeline.

[0030] The floating water intake branch B includes: a floating water intake pump B, a floating water intake pump B outlet pressure gauge, a floating water intake pump B outlet check valve, and a floating water intake pump B outlet electric valve; the inlet of the floating water intake pump B is connected to the floating system via a pipeline, and the outlet of the floating water intake pump B is sequentially connected via a pipeline to the floating water intake pump B outlet pressure gauge, the floating water intake pump B outlet check valve, and the floating water intake pump B outlet electric valve; the floating water intake pump B outlet electric valve is also connected to the floating water intake manifold shut-off valve A via a pipeline.

[0031] The floating water intake branch C includes: a floating water intake pump C, a pressure gauge at the outlet of the floating water intake pump C, a check valve at the outlet of the floating water intake pump C, and an electric valve at the outlet of the floating water intake pump C; the inlet of the floating water intake pump C is connected to the floating system via a pipeline, and the outlet of the floating water intake pump C is sequentially connected via a pipeline to the pressure gauge at the outlet of the floating water intake pump C, the check valve at the outlet of the floating water intake pump C, and the electric valve at the outlet of the floating water intake pump C; the electric valve at the outlet of the floating water intake pump C is also connected to the stop valve A of the floating water intake manifold via a pipeline.

[0032] A water intake method for a seawater desalination system in a nuclear power plant, as described above, includes the following steps:

[0033] Step 1: The water intake system operates in two modes based on the outdoor seawater temperature: a summer operation mode and a winter operation mode.

[0034] Step 2: Based on the outdoor seawater temperature, initiate the summer operation mode to collect water, including:

[0035] When the water intake system starts its summer operation mode, the water intake tunnel introduces seawater into the forebay of the plant area, where it is settled and disinfected. The water intake system starts any two floating water intake branches in the floating water intake facility to operate in parallel, drawing water from the forebay of the plant area. The floating water intake pump outlet pressure gauge, floating water intake pump outlet check valve, and floating water intake pump outlet electric valve on the two operating floating water intake branches are opened, and the water drawn from the forebay of the plant area is sent to the seawater desalination system as industrial water through the floating water intake system manifold shut-off valve A3 and the floating water intake system manifold shut-off valve B.

[0036] Step 3: Activate the winter operation mode based on the outdoor seawater temperature, including:

[0037] When the water intake system starts the winter operation mode, seawater is introduced into the forebay of the plant area through the water intake tunnel. The seawater is then settled and disinfected in the forebay. The settled and disinfected seawater is heated by the No. 3 condenser and the No. 4 condenser respectively and then sent into the No. 3 drainage tunnel and the No. 4 drainage tunnel respectively.

[0038] At gate well No. 3, start any two water intake branches of gate well No. 3 in the water intake pumping station of gate well No. 3 and run them in parallel.

[0039] At gate well No. 4, start any two water intake branches of gate well No. 4 in the water intake pumping station of gate well No. 4 and run them in parallel.

[0040] The gate well water intake pump outlet pressure gauge, gate well water intake pump outlet check valve, and gate well water intake pump outlet electric valve on the two operating gate well water intake branches are opened, and the water taken from the forebay of the plant area is sent to the seawater desalination system as industrial water through gate well No. 3 water intake manifold stop valve A3 and gate well No. 4 water intake manifold stop valve A, respectively.

[0041] The beneficial effects of this invention are:

[0042] This invention makes full use of the directly discharged thermal wastewater from nuclear power plants to reduce costs and increase the production of fresh water. The seawater desalination water intake system designed in this invention has two operating modes: summer operating mode and winter operating mode. In winter operating mode, the water intake system of this invention can effectively increase the water intake temperature and reduce the content of silt and marine organisms by taking water from the unit's thermal wastewater, thereby improving the seawater desalination efficiency.

[0043] Except for winter, the water intake system of this invention adopts the summer operation mode. The water intake system of this invention draws water from the forebay of the plant. Since the water in the forebay has been disinfected and settled, the reverse osmosis membrane of the seawater desalination operates during the high-efficiency filtration period, thereby improving the seawater desalination efficiency.

[0044] The water intake system designed in this invention reduces the need for new seawater pretreatment facilities, thereby lowering the investment cost of seawater desalination projects.

[0045] Furthermore, the seawater desalinated by the water intake system designed in this invention has high quality and can be directly supplied to the unit or used to provide steam water after simple treatment. It can also be implemented together with nuclear heating and steam supply projects, which can broaden the application of nuclear energy, enable nuclear energy to play a greater role, and help achieve the "dual carbon target". Attached Figure Description

[0046] Figure 1 A schematic diagram of the structure of the seawater desalination water intake system for nuclear power plants designed according to the present invention;

[0047] in:

[0048] 1-Intake Tunnel, 2-Forebay, 3-Circulating Water Pump No. 3, 4-Condenser No. 3, 5-Drainage Tunnel No. 3, 6-Gate Shaft No. 3, 7-Circulating Water Pump No. 4, 8-Condenser No. 4, 9-Drainage Tunnel No. 4, 10-Gate Shaft No. 4, 11-Floating Intake Pump A, 12-Outlet Pressure Gauge of Floating Intake Pump A, 13-Outlet Check Valve of Floating Intake Pump A, 14-Outlet Electric Valve of Floating Intake Pump A, 15-Floating Intake Pump B, 16-Outlet Pressure Gauge of Floating Intake Pump B, 17-Outlet Check Valve of Floating Intake Pump B, 18-Outlet Electric Valve of Floating Intake Pump B, 19-Floating Intake Pump C, 20-Outlet Pressure Gauge of Floating Intake Pump C Table 21 - Floating boat water intake pump C outlet check valve; 22 - Floating boat water intake pump C outlet electric valve; 23 - Floating boat water intake system manifold shut-off valve A; 24 - Floating boat water intake system manifold pressure gauge; 25 - Floating boat water intake system manifold shut-off valve B; 26 - Gate well No. 3 water intake pump A; 27 - Gate well No. 3 water intake pump A outlet pressure gauge; 28 - Gate well No. 3 water intake pump A outlet check valve; 29 - Gate well No. 3 water intake pump A outlet electric valve; 30 - Gate well No. 3 water intake pump B; 31 - Gate well No. 3 water intake pump B outlet pressure gauge; 32 - Gate well No. 3 water intake pump B outlet check valve; 33 - Gate well No. 3 water intake pump B outlet electric valve; 34 - 3 Pressure gauges at the outlets of the following gate wells are listed: No. 35-3 gate well intake pump C, No. 36-3 gate well intake pump C outlet check valve, No. 37-3 gate well intake pump C outlet electric valve, No. 38-3 gate well intake manifold shut-off valve A, No. 39-3 gate well intake system manifold pressure gauge, No. 40-3 gate well intake system manifold shut-off valve B, No. 41-4 gate well intake pump A, No. 42-4 gate well intake pump A outlet pressure gauge, No. 43-4 gate well intake pump A outlet check valve, No. 44-4 gate well intake pump A outlet electric valve, No. 45-4 gate well intake pump B, and No. 46-4 gate well intake pump B outlet pressure gauge. 7-4 Gate Well Water Intake Pump B Outlet Check Valve, 48-4 Gate Well Water Intake Pump B Outlet Electric Valve, 49-4 Gate Well Water Intake Pump C, 50-4 Gate Well Water Intake Pump C Outlet Pressure Gauge, 51-4 Gate Well Water Intake Pump C Outlet Check Valve, 52-4 Gate Well Water Intake Pump C Outlet Electric Valve, 53-4 Gate Well Water Intake Manifold Stop Valve A, 54-4 Gate Well Water Intake System Manifold Pressure Gauge, 55-4 Gate Well Water Intake System Manifold Stop Valve B, 56-Seawater Desalination System, 57-Floating Boat Water Intake Facility, 58-3 Gate Well Water Intake Pump Station, 59-4 Gate Well Water Intake Pump Station, 60-Seawater Desalination System Water Supply Pipe. Detailed Implementation

[0049] The following detailed description of a seawater desalination water intake system and its water intake method for a nuclear power plant, in conjunction with the accompanying drawings and embodiments, provides a clear picture of the present invention.

[0050] A seawater desalination water intake system for a nuclear power plant includes: a water intake tunnel 1, a forebay 2, three circulating water pumps 3, a condenser 4, a drainage tunnel 5, a gate well 6, a circulating water pump 7, a condenser 8, a drainage tunnel 9, a gate well 10, a seawater desalination system 56, a floating water intake facility 57, a gate well intake pumping station 58, a gate well intake pumping station 59, a seawater desalination system supply pipe 60, and several pipelines.

[0051] The water intake tunnel 1 is connected to the forebay 2 of the plant area via pipelines. The forebay 2 is connected to the No. 3 circulating water pump 3, the No. 4 circulating water pump 7, and the floating water intake facility 57. The No. 3 circulating water pump 3 is connected to one end of the No. 3 condenser 4 via pipelines. The other end of the No. 3 condenser 4 is connected to the No. 3 gate well 6 via pipelines. The No. 3 gate well 6 is also connected to the No. 3 gate well water intake pump station 58 via pipelines. A No. 3 drainage tunnel 5 is also provided between the No. 3 condenser 4 and the No. 3 gate well 6. The No. 3 gate well water intake pump station 58 is connected to the seawater desalination system 56 via pipelines.

[0052] The No. 4 circulating water pump 7 is connected to one end of the No. 4 condenser 8 via a pipeline, and the other end of the No. 4 condenser 8 is connected to the No. 4 gate well 10 via a pipeline. The No. 4 gate well 10 is also connected to the No. 4 gate well water intake pump station 59 via a pipeline. A No. 4 drainage tunnel 9 is also provided between the No. 4 condenser 8 and the No. 4 gate well 10. The No. 4 gate well water intake pump station 59 is connected to the seawater desalination system 56 via a pipeline.

[0053] The floating water intake facility 57 is connected to the seawater desalination system 56 via pipelines;

[0054] The seawater desalination system 56 is equipped with a seawater desalination system water supply pipe 60.

[0055] The pipeline connecting the No. 3 gate well water intake pump station 58 and the seawater desalination system 56 is respectively equipped with a No. 3 gate well water intake manifold shut-off valve A38, a No. 3 gate well water intake system manifold pressure gauge 39, and a No. 3 gate well water intake system manifold shut-off valve B40. One end of the No. 3 gate well water intake manifold shut-off valve A38 is connected to the No. 3 gate well water intake pump station 58, and the other end of the No. 3 gate well water intake manifold shut-off valve A38 is connected to the No. 3 gate well water intake system manifold shut-off valve B40. A No. 3 gate well water intake system manifold pressure gauge 39 is installed between the No. 3 gate well water intake manifold shut-off valve A38 and the No. 3 gate well water intake system manifold shut-off valve B40.

[0056] The No. 3 gate well water intake pumping station 58 includes three gate well water intake branches, namely: No. 3 gate well water intake branch A, No. 3 gate well water intake branch B and No. 3 gate well water intake branch C;

[0057] The No. 3 gate well water intake branch A, No. 3 gate well water intake branch B, and No. 3 gate well water intake branch C are connected in parallel, and the three gate well water intake branches in the No. 3 gate well water intake pumping station 58 operate in a two-in-use and one-standby mode. When any two gate well water intake branches in the No. 3 gate well water intake pumping station 58 are running in parallel, the total water supply of the pumps is 3900 m³. 3 / h, with a head of 38m.

[0058] The No. 3 gate well water intake branch A includes: No. 3 gate well water intake pump A26, No. 3 gate well water intake pump A outlet pressure gauge 27, No. 3 gate well water intake pump A outlet check valve 28, and No. 3 gate well water intake pump A outlet electric valve 29; the inlet of No. 3 gate well water intake pump A26 is connected to No. 3 gate well 6 via a pipeline, and the outlet of No. 3 gate well water intake pump A26 is sequentially connected to No. 3 gate well water intake pump A outlet pressure gauge 27, No. 3 gate well water intake pump A outlet check valve 28, and No. 3 gate well water intake pump A outlet electric valve 29 via a pipeline; the No. 3 gate well water intake pump A outlet electric valve 29 is also connected to the No. 3 gate well water intake manifold shut-off valve A38 via a pipeline;

[0059] The No. 3 gate well water intake branch B includes: No. 3 gate well water intake pump B30, No. 3 gate well water intake pump B outlet pressure gauge 31, No. 3 gate well water intake pump B outlet check valve 32, and No. 3 gate well water intake pump B outlet electric valve 33; the inlet of No. 3 gate well water intake pump B30 is connected to No. 3 gate well 6 via a pipeline, and the outlet of No. 3 gate well water intake pump B30 is sequentially connected to No. 3 gate well water intake pump B outlet pressure gauge 31, No. 3 gate well water intake pump B outlet check valve 32, and No. 3 gate well water intake pump B outlet electric valve 33 via a pipeline; the No. 3 gate well water intake pump B outlet electric valve 33 is also connected to the No. 3 gate well water intake manifold shut-off valve A38 via a pipeline.

[0060] The No. 3 gate well water intake branch C includes: No. 3 gate well water intake pump C34, No. 3 gate well water intake pump C outlet pressure gauge 35, No. 3 gate well water intake pump C outlet check valve 36, and No. 3 gate well water intake pump C outlet electric valve 37; the inlet of No. 3 gate well water intake pump C34 is connected to No. 3 gate well 6 via a pipeline, and the outlet of No. 3 gate well water intake pump C34 is sequentially connected to No. 3 gate well water intake pump C outlet pressure gauge 35, No. 3 gate well water intake pump C outlet check valve 36, and No. 3 gate well water intake pump C outlet electric valve 37 via a pipeline; the No. 3 gate well water intake pump C outlet electric valve 37 is also connected to the No. 3 gate well water intake manifold shut-off valve A38 via a pipeline.

[0061] The pipeline connecting the No. 4 gate well water intake pump station 59 and the seawater desalination system 56 is respectively equipped with a No. 4 gate well water intake manifold shut-off valve A53, a No. 4 gate well water intake system manifold pressure gauge 54, and a No. 4 gate well water intake system manifold shut-off valve B55; one end of the No. 4 gate well water intake manifold shut-off valve A53 is connected to the No. 4 gate well water intake pump station 59, and the other end of the No. 4 gate well water intake manifold shut-off valve A53 is connected to the No. 4 gate well water intake system manifold shut-off valve B55; a No. 4 gate well water intake system manifold pressure gauge 54 is installed between the No. 4 gate well water intake manifold shut-off valve A53 and the No. 4 gate well water intake system manifold shut-off valve B55.

[0062] The No. 4 gate well water intake pumping station 59 includes three gate well water intake branches, namely: No. 4 gate well water intake branch A, No. 4 gate well water intake branch B and No. 4 gate well water intake branch C;

[0063] The No. 4 gate well water intake branch A, No. 4 gate well water intake branch B, and No. 4 gate well water intake branch C are connected in parallel, and the three gate well water intake branches in the No. 4 gate well water intake pumping station 59 operate in a two-in-use and one-standby mode. When any two gate well water intake branches in the No. 4 gate well water intake pumping station 59 are running in parallel, the total water supply of the pumps is 3900 m³. 3 / h, with a head of 38m.

[0064] The No. 4 gate well water intake branch A includes: No. 4 gate well water intake pump A41, No. 4 gate well water intake pump A outlet pressure gauge 42, No. 4 gate well water intake pump A outlet check valve 43, and No. 4 gate well water intake pump A outlet electric valve 44; the inlet of No. 4 gate well water intake pump A41 is connected to No. 4 gate well 10 via a pipeline, and the outlet of No. 4 gate well water intake pump A41 is sequentially connected to No. 4 gate well water intake pump A outlet pressure gauge 42, No. 4 gate well water intake pump A outlet check valve 43, and No. 4 gate well water intake pump A outlet electric valve 44 via a pipeline; the No. 4 gate well water intake pump A outlet electric valve 44 is also connected to the No. 4 gate well water intake manifold shut-off valve A53 via a pipeline;

[0065] The No. 4 gate well water intake branch B includes: No. 4 gate well water intake pump B45, No. 4 gate well water intake pump B outlet pressure gauge 46, No. 4 gate well water intake pump B outlet check valve 47, and No. 4 gate well water intake pump B outlet electric valve 48; the inlet of No. 4 gate well water intake pump B45 is connected to No. 4 gate well 6 via a pipeline, and the outlet of No. 4 gate well water intake pump B45 is sequentially connected to No. 4 gate well water intake pump B outlet pressure gauge 46, No. 4 gate well water intake pump B outlet check valve 47, and No. 4 gate well water intake pump B outlet electric valve 48 via a pipeline; the No. 4 gate well water intake pump B outlet electric valve 48 is also connected to the No. 4 gate well water intake manifold shut-off valve A53 via a pipeline.

[0066] The No. 4 gate well water intake branch C includes: No. 4 gate well water intake pump C49, No. 4 gate well water intake pump C outlet pressure gauge 50, No. 4 gate well water intake pump C outlet check valve 51, and No. 4 gate well water intake pump C outlet electric valve 52; the inlet of No. 4 gate well water intake pump C49 is connected to No. 4 gate well 6 via a pipeline, and the outlet of No. 4 gate well water intake pump C49 is sequentially connected to No. 4 gate well water intake pump C outlet pressure gauge 50, No. 4 gate well water intake pump C outlet check valve 51, and No. 4 gate well water intake pump C outlet electric valve 52 via a pipeline; the No. 4 gate well water intake pump C outlet electric valve 52 is also connected to the No. 4 gate well water intake manifold shut-off valve A53 via a pipeline.

[0067] The floating water intake facility 57 and the seawater desalination system 56 are respectively equipped with a floating water intake system manifold shut-off valve A23, a floating water intake system manifold pressure gauge 24 and a floating water intake system manifold shut-off valve B25 on the pipeline connecting them.

[0068] One end of the floating water intake system manifold shut-off valve A23 is connected to the floating water intake facility 57, and the other end of the floating water intake system manifold shut-off valve A23 is connected to the floating water intake system manifold shut-off valve B25. A floating water intake system manifold pressure gauge 24 is installed between the floating water intake system manifold shut-off valve A23 and the floating water intake system manifold shut-off valve B25.

[0069] The floating water intake facility 57 includes three floating water intake branches: floating water intake branch A, floating water intake branch B, and floating well water intake branch C.

[0070] The floating water intake branch A, floating water intake branch B, and floating well water intake branch C are connected in parallel. The three floating water intake branches within the floating water intake facility 57 operate in a two-in-use, one-standby mode. When any two floating water intake branches in the floating water intake facility 57 are operating in parallel, the total water supply from the pumps is 3900 m³. 3 / h.

[0071] The floating water intake branch A includes: a floating water intake pump A11, a floating water intake pump A outlet pressure gauge 12, a floating water intake pump A outlet check valve 13, and a floating water intake pump A outlet electric valve 14; the inlet of the floating water intake pump A11 is connected to the floating system 6 via a pipeline, and the outlet of the floating water intake pump A11 is sequentially connected to the floating water intake pump A outlet pressure gauge 12, the floating water intake pump A outlet check valve 13, and the floating water intake pump A outlet electric valve 14 via a pipeline; the floating water intake pump A outlet electric valve 14 is also connected to the floating water intake manifold shut-off valve A23 via a pipeline.

[0072] The floating water intake branch B includes: a floating water intake pump B15, a floating water intake pump B outlet pressure gauge 16, a floating water intake pump B outlet check valve 17, and a floating water intake pump B outlet electric valve 18; the inlet of the floating water intake pump B15 is connected to the floating system 6 via a pipeline, and the outlet of the floating water intake pump B15 is sequentially connected to the floating water intake pump B outlet pressure gauge 16, the floating water intake pump B outlet check valve 17, and the floating water intake pump B outlet electric valve 18 via a pipeline; the floating water intake pump B outlet electric valve 18 is also connected to the floating water intake manifold shut-off valve A23 via a pipeline.

[0073] The floating water intake branch C includes: a floating water intake pump C19, a floating water intake pump C outlet pressure gauge 20, a floating water intake pump C outlet check valve 21, and a floating water intake pump C outlet electric valve 22; the inlet of the floating water intake pump C19 is connected to the floating system 6 via a pipeline, and the outlet of the floating water intake pump C19 is sequentially connected to the floating water intake pump C outlet pressure gauge 20, the floating water intake pump C outlet check valve 21, and the floating water intake pump C outlet electric valve 22 via a pipeline; the floating water intake pump C outlet electric valve 22 is also connected to the floating water intake manifold shut-off valve A23 via a pipeline.

[0074] A water intake method for a seawater desalination system in a nuclear power plant, as described above, includes the following steps:

[0075] Step 1: The water intake system operates in two modes based on the outdoor seawater temperature: a summer operation mode and a winter operation mode.

[0076] Step 2: Based on the outdoor seawater temperature, initiate the summer operation mode to collect water, including:

[0077] When the water intake system starts its summer operation mode, the water intake tunnel 1 introduces seawater into the forebay 2 of the plant area, where it is settled and disinfected. The water intake system starts any two floating water intake branches of the floating water intake facility 57 to operate in parallel, drawing water from the forebay 2 of the plant area. The floating water intake pump outlet pressure gauge, floating water intake pump outlet check valve, and floating water intake pump outlet electric valve on the two operating floating water intake branches are opened, and the water drawn from the forebay 2 of the plant area is sent to the seawater desalination system 56 as industrial water through the floating water intake system manifold shut-off valve A23 and the floating water intake system manifold shut-off valve B25.

[0078] Step 3: Activate the winter operation mode based on the outdoor seawater temperature, including:

[0079] When the water intake system starts the winter operation mode, seawater is introduced into the forebay 2 of the plant area from the water intake tunnel 1. The seawater is then settled and disinfected in the forebay. The settled and disinfected seawater is heated by the No. 3 condenser 4 and the No. 4 condenser 8 respectively and then sent into the No. 3 drainage tunnel 5 and the No. 4 drainage tunnel 9 respectively.

[0080] At point 6 of gate well No. 3, start any two water intake branches of gate well No. 3 in the No. 3 gate well water intake pump station 58 to operate in parallel.

[0081] At gate well No. 4, at point 10, start any two water intake branches of gate well No. 4 in gate well No. 4 water intake pump station No. 59 to operate in parallel;

[0082] The gate well water intake pump outlet pressure gauge, gate well water intake pump outlet check valve, and gate well water intake pump outlet electric valve on the two operating gate well water intake branches are opened, and the water taken from the forebay 2 of the plant area is sent to the seawater desalination system 56 as industrial water through the gate well water intake manifold shut-off valve A38 of gate well No. 3 and the gate well water intake manifold shut-off valve A53 of gate well No. 4 respectively.

[0083] The summer operation mode is from May to October when the outdoor seawater temperature is low, and the winter operation mode is from November to April when the outdoor seawater temperature is normal.

[0084] The three water intake pumps in the floating water intake facility 57 operate in a two-in-use, one-on-standby mode, and the pumps are horizontal centrifugal pumps. The water supply capacity after parallel operation is 3900 m³. 3 / h.

[0085] Among them, the three water intake pumps in pump station 58 of gate well No. 3 are submersible axial flow pumps, and the three water intake pumps in pump station 59 of gate well No. 4 are three submersible long shaft pumps.

[0086] Both Gate Well No. 3 water intake pumping station 58 and Gate Well No. 4 water intake pumping station 59 operate in a dual-unit mode, meaning that at least one gate well water intake pumping station is in operation and there is warm drainage at the gate well at the same time. The submersible axial flow pump and the submersible long shaft pump at the gate well water intake pumping station operate alternately as backups for each other.

[0087] The embodiments of the present invention have been described in detail above. The present invention is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A nuclear power plant seawater desalination intake system, characterized by, It comprises: a water intake tunnel (1), a front pool (2), a No. 3 circulating water pump (3), a No. 3 condenser (4), a No. 3 drainage tunnel (5), a No. 3 gate well (6), a No. 4 circulating water pump (7), a No. 4 condenser (8), a No. 4 drainage tunnel (9), a No. 4 gate well (10), a seawater desalination system (56), a floating boat type water intake facility (57), a No. 3 gate well water intake pump station (58), a No. 4 gate well water intake pump station (59), a seawater desalination system water supply pipe (60) and a plurality of pipelines; The water intake tunnel (1) is connected with the front pool (2) through a pipeline, the front pool (2) is respectively connected with the No. 3 circulating water pump (3), the No. 4 circulating water pump (7) and the floating boat type water intake facility (57), the No. 3 circulating water pump (3) is connected with one end of the No. 3 condenser (4) through a pipeline, the other end of the No. 3 condenser (4) is connected with the No. 3 gate well (6) through a pipeline, the No. 3 gate well (6) is further connected with the No. 3 gate well water intake pump station (58) through a pipeline, and the No. 3 condenser (4) and the No. 3 gate well (6) are further provided with the No. 3 drainage tunnel (5); the No. 3 gate well water intake pump station (58) is connected with the seawater desalination system (56) through a pipeline; The No. 4 circulating water pump (7) is connected with one end of the No. 4 condenser (8) through a pipeline, the other end of the No. 4 condenser (8) is connected with the No. 4 gate well (10) through a pipeline, the No. 4 gate well (10) is further connected with the No. 4 gate well water intake pump station (59) through a pipeline, and the No. 4 condenser (8) and the No. 4 gate well (10) are further provided with the No. 4 drainage tunnel (9); the No. 4 gate well water intake pump station (59) is connected with the seawater desalination system (56) through a pipeline; The floating boat type water intake facility (57) is connected with the seawater desalination system (56) through a pipeline; The seawater desalination system (56) is provided with a seawater desalination system water supply pipe (60).

2. A nuclear power plant seawater desalination intake system according to claim 1, characterized in that: The pipeline connecting the No. 3 gate well water intake pump station (58) with the seawater desalination system (56) is respectively provided with a No. 3 gate well water intake header stop valve A (38), a No. 3 gate well water intake system header pressure gauge (39) and a No. 3 gate well water intake system header stop valve B (40); one end of the No. 3 gate well water intake header stop valve A (38) is connected with the No. 3 gate well water intake pump station (58), the other end of the No. 3 gate well water intake header stop valve A (38) is connected with the No. 3 gate well water intake system header stop valve B (40), and the No. 3 gate well water intake system header pressure gauge (39) is arranged between the No. 3 gate well water intake header stop valve A (38) and the No. 3 gate well water intake system header stop valve B (40).

3. A nuclear power plant seawater desalination intake system according to claim 2, characterized in that: The No. 3 gate well water intake pump station (58) comprises three gate well water intake branches, namely a No. 3 gate well water intake branch A, a No. 3 gate well water intake branch B and a No. 3 gate well water intake branch C; The three gate well water taking branches A, B and C of the No. 3 gate well are connected in parallel, and the three gate well water taking branches in the No. 3 gate well water taking pump station (58) are in a two-in-one standby operation mode. When any two of the three gate well water taking branches in the No. 3 gate well water taking pump station (58) are connected in parallel, the total water supply capacity of the water pump is 3900 m 3 / h, and the head is 38 m.

4. The seawater desalination water intake system of a nuclear power plant according to claim 3, wherein The No. 3 gate well water intake branch A comprises: No. 3 gate well water intake pump A (26), No. 3 gate well water intake pump A outlet pressure gauge (27), No. 3 gate well water intake pump A outlet check valve (28) and No. 3 gate well water intake pump A outlet electric valve (29); the inlet of No. 3 gate well water intake pump A (26) is connected with No. 3 gate well (6) through a pipeline, and the outlet of No. 3 gate well water intake pump A (26) is connected with No. 3 gate well water intake pump A outlet pressure gauge (27), No. 3 gate well water intake pump A outlet check valve (28) and No. 3 gate well water intake pump A outlet electric valve (29) in sequence through a pipeline; and the No. 3 gate well water intake pump A outlet electric valve (29) is further connected with No. 3 gate well water intake header stop valve A (38) through a pipeline. The No. 3 gate well water intake branch B comprises: No. 3 gate well water intake pump B (30), No. 3 gate well water intake pump B outlet pressure gauge (31), No. 3 gate well water intake pump B outlet check valve (32) and No. 3 gate well water intake pump B outlet electric valve (33); the inlet of No. 3 gate well water intake pump B (30) is connected with No. 3 gate well (6) through a pipeline, and the outlet of No. 3 gate well water intake pump B (30) is connected with No. 3 gate well water intake pump B outlet pressure gauge (31), No. 3 gate well water intake pump B outlet check valve (32) and No. 3 gate well water intake pump B outlet electric valve (33) in sequence through a pipeline; and the No. 3 gate well water intake pump B outlet electric valve (33) is further connected with No. 3 gate well water intake header stop valve A (38) through a pipeline. The No. 3 gate well water intake branch C comprises: No. 3 gate well water intake pump C (34), No. 3 gate well water intake pump C outlet pressure gauge (35), No. 3 gate well water intake pump C outlet check valve (36) and No. 3 gate well water intake pump C outlet electric valve (37); the inlet of No. 3 gate well water intake pump C (34) is connected with No. 3 gate well (6) through a pipeline, and the outlet of No. 3 gate well water intake pump C (34) is connected with No. 3 gate well water intake pump C outlet pressure gauge (35), No. 3 gate well water intake pump C outlet check valve (36) and No. 3 gate well water intake pump C outlet electric valve (37) in sequence through a pipeline; and the No. 3 gate well water intake pump C outlet electric valve (37) is further connected with No. 3 gate well water intake header stop valve A (38) through a pipeline.

5. A nuclear power plant seawater desalination intake system according to claim 4, characterized in that: The pipeline, in which the No. 4 gate well water intake pump station (59) is connected with the seawater desalination system (56), is provided with No. 4 gate well water intake header stop valve A (53), No. 4 gate well water intake system header pressure gauge (54) and No. 4 gate well water intake system header stop valve B (55) in sequence; one end of the No. 4 gate well water intake header stop valve A (53) is connected with the No. 4 gate well water intake pump station (59), the other end of the No. 4 gate well water intake header stop valve A (53) is connected with the No. 4 gate well water intake system header stop valve B (55), and the No. 4 gate well water intake system header pressure gauge (54) is arranged between the No. 4 gate well water intake header stop valve A (53) and the No. 4 gate well water intake system header stop valve B (55).

6. A nuclear power plant seawater desalination intake system according to claim 5, characterized in that: The 4th gate well water intake pump station (59) includes three gate well water intake branches, namely, a 4th gate well water intake branch A, a 4th gate well water intake branch B and a 4th gate well water intake branch C; The No. 4 gate well water intake branch A, the No. 4 gate well water intake branch B and the No. 4 gate well water intake branch C are arranged in parallel, and the three gate well water intake branches in the No. 4 gate well water intake pump station (59) are in a two-use-one-backup operation mode. When any two of the three gate well water intake branches in the No. 4 gate well water intake pump station (59) are operated in parallel, the total water supply capacity of the water pump is 3900 m 3 / h, and the head is 38 m.

7. A nuclear power plant seawater desalination intake system according to claim 6, characterized in that: The 4th gate well water intake branch A includes a 4th gate well water intake pump A (41), a 4th gate well water intake pump A outlet pressure gauge (42), a 4th gate well water intake pump A outlet check valve (43) and a 4th gate well water intake pump A outlet electric valve (44); the inlet of the 4th gate well water intake pump A (41) is connected with the 4th gate well (10) through a pipeline, and the outlet of the 4th gate well water intake pump A (41) is connected with the 4th gate well water intake pump A outlet pressure gauge (42), the 4th gate well water intake pump A outlet check valve (43) and the 4th gate well water intake pump A outlet electric valve (44) in sequence through a pipeline; the 4th gate well water intake pump A outlet electric valve (44) is further connected with the 4th gate well water intake header stop valve A (53) through a pipeline; The 4th gate well water intake branch B includes a 4th gate well water intake pump B (45), a 4th gate well water intake pump B outlet pressure gauge (46), a 4th gate well water intake pump B outlet check valve (47) and a 4th gate well water intake pump B outlet electric valve (48); the inlet of the 4th gate well water intake pump B (45) is connected with the 4th gate well through a pipeline, and the outlet of the 4th gate well water intake pump B (45) is connected with the 4th gate well water intake pump B outlet pressure gauge (46), the 4th gate well water intake pump B outlet check valve (47) and the 4th gate well water intake pump B outlet electric valve (48) in sequence through a pipeline; the 4th gate well water intake pump B outlet electric valve (48) is further connected with the 4th gate well water intake header stop valve A (53) through a pipeline; The 4th gate well water intake branch C includes a 4th gate well water intake pump C (49), a 4th gate well water intake pump C outlet pressure gauge (50), a 4th gate well water intake pump C outlet check valve (51) and a 4th gate well water intake pump C outlet electric valve (52); the inlet of the 4th gate well water intake pump C (49) is connected with the 4th gate well through a pipeline, and the outlet of the 4th gate well water intake pump C (49) is connected with the 4th gate well water intake pump C outlet pressure gauge (50), the 4th gate well water intake pump C outlet check valve (51) and the 4th gate well water intake pump C outlet electric valve (52) in sequence through a pipeline; the 4th gate well water intake pump C outlet electric valve (52) is further connected with the 4th gate well water intake header stop valve A (53) through a pipeline.

8. A nuclear power plant seawater desalination intake system according to claim 7, characterized in that: The pipeline, in which the floating boat water intake system is connected with the seawater desalination system (56), is provided with a floating boat water intake system header stop valve A (23), a floating boat water intake system header pressure gauge (24) and a floating boat water intake system header stop valve B (25). One end of the floating ship water taking system manifold stop valve A (23) is connected with the floating ship water taking facility (57), and the other end of the floating ship water taking system manifold stop valve A (23) is connected with the floating ship water taking system manifold stop valve B (25), and a floating ship water taking system manifold pressure gauge (24) is arranged between the floating ship water taking system manifold stop valve A (23) and the floating ship water taking system manifold stop valve B (25).

9. A nuclear power plant seawater desalination intake system according to claim 8, characterized in that: The floating ship water taking facility (57) comprises three floating ship water taking branches, namely a floating ship water taking branch A, a floating ship water taking branch B and a floating ship water taking branch C; The floating boat type water taking branch A, the floating boat type water taking branch B and the floating boat type well water taking branch C are connected in parallel, and the three floating boat type water taking branches in the floating boat type water taking facility (57) are in a two-in-one standby operation mode. When any two floating boat type water taking branches in the floating boat type water taking facility (57) are connected in parallel, the total water supply capacity of the water pump is 3900 m 3 / h. The floating ship water taking branch A comprises a floating ship water taking pump A (11), a floating ship water taking pump A outlet pressure gauge (12), a floating ship water taking pump A outlet check valve (13) and a floating ship water taking pump A outlet electric valve (14); the inlet of the floating ship water taking pump A (11) is connected with the floating ship (6) through a pipeline, and the outlet of the floating ship water taking pump A (11) is sequentially connected with the floating ship water taking pump A outlet pressure gauge (12), the floating ship water taking pump A outlet check valve (13) and the floating ship water taking pump A outlet electric valve (14) through pipelines; and the floating ship water taking pump A outlet electric valve (14) is further connected with the floating ship water taking system manifold stop valve A (23) through a pipeline; The floating ship water taking branch B comprises a floating ship water taking pump B (15), a floating ship water taking pump B outlet pressure gauge (16), a floating ship water taking pump B outlet check valve (17) and a floating ship water taking pump B outlet electric valve (18); the inlet of the floating ship water taking pump B (15) is connected with the floating ship (6) through a pipeline, and the outlet of the floating ship water taking pump B (15) is sequentially connected with the floating ship water taking pump B outlet pressure gauge (16), the floating ship water taking pump B outlet check valve (17) and the floating ship water taking pump B outlet electric valve (18) through pipelines; and the floating ship water taking pump B outlet electric valve (18) is further connected with the floating ship water taking system manifold stop valve A (23) through a pipeline; The floating ship water taking branch C comprises a floating ship water taking pump C (19), a floating ship water taking pump C outlet pressure gauge (20), a floating ship water taking pump C outlet check valve (21) and a floating ship water taking pump C outlet electric valve (22); the inlet of the floating ship water taking pump C (19) is connected with the floating ship (6) through a pipeline, and the outlet of the floating ship water taking pump C (19) is sequentially connected with the floating ship water taking pump C outlet pressure gauge (20), the floating ship water taking pump C outlet check valve (21) and the floating ship water taking pump C outlet electric valve (22) through pipelines; and the floating ship water taking pump C outlet electric valve (22) is further connected with the floating ship water taking system manifold stop valve A (23) through a pipeline.

10. A method of taking in water for a nuclear power plant seawater desalination system according to any one of claims 1 to 9, characterized in that The method comprises the following steps: Step one, the water source of the water taking system is divided into two operation modes according to the outdoor seawater temperature, namely a summer operation mode and a winter operation mode, Step two, the summer operation mode water taking is started according to the outdoor seawater temperature, comprising: When the water intake system starts the summer operation mode, the water intake tunnel (1) introduces seawater into the plant front pool (2) and carries out standing and disinfection in the front pool. The water intake system starts any two parallel floating boat water intake branches in the floating boat water intake facility (57) to take water from the plant front pool (2). The floating boat water intake pump outlet pressure gauge, floating boat water intake pump outlet check valve and floating boat water intake pump outlet electric valve on the two floating boat water intake branches are opened, and the water taken from the plant front pool (2) is sent into the seawater desalination system (56) as industrial water through the floating boat water intake system header stop valve A (23) and the floating boat water intake system header stop valve B (25). Step three, according to the outdoor seawater temperature to start the winter operation mode, including: When the water intake system starts the winter operation mode, seawater is introduced from the water intake tunnel (1) into the plant front pool (2) and carried out standing and disinfection in the front pool. The standing and disinfected seawater is warmed by the No. 3 circulating water pump (3) and the No. 4 circulating water pump (7) through the No. 3 condenser (4) and the No. 4 condenser (8) respectively, and then sent into the No. 3 drainage tunnel (5) and the No. 4 drainage tunnel (9) respectively. At the No. 3 gate well (6), any two parallel No. 3 gate well water intake branches in the No. 3 gate well water intake pump station (58) are started to operate. At the No. 4 gate well (10), any two parallel No. 4 gate well water intake branches in the No. 4 gate well water intake pump station (59) are started to operate. The gate well water intake pump outlet pressure gauge, gate well water intake pump outlet check valve and gate well water intake pump outlet electric valve on the two gate well water intake branches are opened, and the water taken from the plant front pool (2) is sent into the seawater desalination system (56) as industrial water through the No. 3 gate well water intake header stop valve A (38) and the No. 4 gate well water intake header stop valve A (53).

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