CN115012496A - Long-distance wastewater discharge system for offshore nuclear power plant - Google Patents

Abstract

The application belongs to the technical field of wastewater discharge of nuclear power plants, and particularly relates to a long-distance wastewater discharge system for offshore nuclear power plants; the system comprises: the system comprises a factory area drainage module, a land area drainage module and a sea area drainage module; the factory drainage module conveys waste water to the land drainage module through land drainage pipelines; the land drainage pipeline is designed into a double-sleeve pipe; the plant area drainage module comprises a waste water discharge device and a fresh water conveying device; the waste water discharge device conveys waste water to the land drainage module through an inner sleeve of a land drainage pipeline; the fresh water conveying device conveys fresh water to a position between the inner sleeve and the outer sleeve of the land area drainage pipeline so as to fill the position between the inner sleeve and the outer sleeve of the land area drainage pipeline with fresh water; the land drainage module conveys waste water to the sea drainage module through a sea drainage pipeline; the sea area drainage module discharges the wastewater to the ocean. The double-sleeve design of the land drainage pipeline realizes the reliable physical isolation of the wastewater and the environmental soil.

Description

Long-distance wastewater discharge system for offshore nuclear power plant

Technical Field

The application belongs to the technical field of nuclear power plant wastewater discharge, and particularly relates to a long-distance wastewater discharge system for an offshore nuclear power plant.

Background

The straight line distance between a plant site of an offshore nuclear energy heat supply nuclear power plant and the coast can reach dozens of kilometers generally, and meanwhile, the fresh water resources around the nuclear power plant are limited, and a process system of the nuclear power plant needs to be cooled by adopting a seawater cooling mode. The seawater cooling mode comprises a direct-flow cooling mode and a cooling tower cooling mode. The offshore plant is far from the sea, the direct-current cooling cost is high, the running cost is high, the cooling tower cooling mode is mostly adopted, the water outlet of the cooling tower provides cooling water for the condenser of the conventional island steam turbine and an auxiliary machine cooling system through a circulating water pump, and the heated cooling water is sent back to the cooling tower for cooling through a pressure pipeline. The seawater is circulated to dissipate heat into the air, and the circulating seawater is continuously concentrated, so that the equipment and the pipeline are damaged due to the increase of salinity of the concentrated seawater, and therefore, strong brine needs to be discharged periodically; meanwhile, if a nuclear power plant adopts a seawater desalination process, strong brine can be generated; and discharging wastewater qualified in nuclear island treatment. The brine and the waste water (hereinafter collectively referred to as waste water) are discharged together to a special utilization area in the sea.

The mode of waste water discharge which is more economical is a direct buried pipeline. As the waste water direct-buried pipeline needs to pass through the land (including farmland) area, once the pipeline wall is damaged, the waste water leakage can cause the soil salinization of the land area, and the local agricultural resources are damaged. The traditional method is to add measures such as fluid monitoring, judging leakage conditions by comparing water flow changes of an inlet and an outlet, or strengthening construction quality, but the leakage conditions of strong brine cannot be monitored in real time, and remediation cannot be carried out in time. Because the water flow of the waste water is large, when the flow change is monitored by the fluid, the waste water pollutes the soil near the leakage point of the direct-buried pipe, damages the surrounding soil, and increases the risks of compensation, public opinion and the like.

Disclosure of Invention

The application aims at providing a long-distance wastewater discharge system for offshore nuclear power plants, and solving the problem that the existing dozens of types of wastewater cannot be timely remedied to cause damage to soil and ecological environment.

The technical scheme for realizing the purpose of the application is as follows:

the embodiment of the application provides a long distance wastewater discharge system for offshore nuclear power plant, the system includes: the system comprises a factory area drainage module, a land area drainage module and a sea area drainage module;

the plant area drainage module conveys waste water to the land area drainage module through a land area drainage pipeline;

the land drainage pipeline is designed into a double-sleeve pipe;

the plant area drainage module comprises a waste water discharge device and a fresh water conveying device; the waste water discharge device conveys the waste water to the land drainage module through an inner sleeve of the land drainage pipeline; the fresh water conveying device conveys fresh water to a position between the inner sleeve and the outer sleeve of the land area drainage pipeline, so that the position between the inner sleeve and the outer sleeve of the land area drainage pipeline is filled with the fresh water;

the land drainage module conveys the wastewater to the sea drainage module through a sea drainage pipeline;

the sea area drainage module is used for discharging the wastewater to the sea.

Optionally, at least one monitoring point is arranged on the land drainage pipeline and used for monitoring the quality of the fresh water between the inner sleeve and the outer sleeve.

Alternatively to this, the first and second parts may,

at least two land drainage pipelines are provided, and one of the two land drainage pipelines is used for standby.

Optionally, the inner sleeve of the land drainage pipeline is made of glass fiber reinforced plastics, and the outer wall of the inner sleeve is coated with antirust paint; the outer sleeve of the land drainage pipeline is made of concrete; and the inner sleeve and the outer sleeve are provided with access holes for pipeline maintenance. .

Optionally, there are a plurality of monitoring points, and one monitoring point is arranged on the land drainage pipeline at a preset distance.

Optionally, the land drainage module includes: a high-level drainage tower and a fresh water drainage pump;

the high-level drainage tower is arranged at a sea-land junction;

the inner sleeve of the land drainage pipeline is arranged in an inverted U-shaped structure on the high-level drainage tower and is connected with the sea drainage pipeline;

fresh water between the inner sleeve and the outer sleeve of the land drainage pipeline is conveyed into the high-level drainage tower and is discharged to the ocean through the fresh water drainage pump.

Optionally, the land drainage module further includes: a vacuum pump;

the vacuum pump is used for pumping non-condensable gas in the inverted U-shaped inner sleeve in the high-level drainage tower and pumping vacuum with a certain numerical value.

Optionally, the high-level drainage tower is provided with a monitor for monitoring the salinity of fresh water therein.

Optionally, at least one drain cap is arranged on the sea area drainage pipeline and used as a drain port for draining the wastewater into the sea.

Optionally, the number of the sea area drainage pipelines is at least two.

Optionally, the sea drainage module includes: a discharge port management pen;

the drain port management fence for preventing the drain cap from being collided.

The beneficial technical effect of this application lies in:

(1) the embodiment of the application provides a long distance waste water discharging system for coastal waters nuclear power plant, the double-casing design of land drainage pipe can realize that waste water flows in the inner casing, the inner and outer casings are filled with fresh water, even if the waste water of the inner casing leaks, the waste water can only leak to the fresh water between the inner and outer casings, the reliable physical isolation of waste water and environmental soil is realized, and the zero leakage of the external environment in the waste water discharging process can be realized by greatly reducing the difficulty of waste water pipe leakage monitoring, the damage of waste water to the soil environment is avoided, the ecological and social benefits are obvious, and the system is initiated domestically.

(2) The embodiment of the application provides a coastal waters is long distance waste water discharge system for nuclear power plant, through monitoring point and salinity monitor at land area drainage pipe and high-order water drainage tower setting, can real-time supervision land area drainage pipe and the high-order fresh water salinity in the water drainage tower, even the land area drainage pipe takes place that trace waste water leaks also can be in time to discover.

(3) The embodiment of the application provides a long distance waste water discharging system for coastal waters nuclear power plant, through setting up two at least land drainage pipe, can realize in time switching pipeline, not influence the system normal operating under the waste water leakage condition, can not cause the influence to the unit operation, and make things convenient for the trouble pipeline to find time water isolation, personnel's entering in time to repair of managing to find time.

Drawings

FIG. 1 is a schematic structural diagram of a long-distance wastewater discharge system for an offshore nuclear power plant according to an embodiment of the present disclosure;

FIG. 2 is a sectional view of a land drainage pipeline in a long-distance wastewater drainage system for an offshore nuclear power plant according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of another long-distance wastewater discharge system for an offshore nuclear power plant according to an embodiment of the present application.

In the figure:

1-a plant area drainage module; 11-a waste water discharge device; 12-a fresh water delivery device; 13-a waste water pump;

14-a water suction pool; 15-a fresh water pool; 16-ring network; 17-fresh water replenishing pump;

2-land drainage module; 21-a high level drainage tower; 22-fresh water draining pump; 23-a vacuum pump;

3-sea area drainage module; 31-discharge port management pens;

4-land drain pipes; 41-inner sleeve pipe; 42-outer sleeve; 43-monitoring points;

5-sea area drainage pipeline; 51-drain cap.

Detailed Description

In order to make the technical solutions in the embodiments of the present application more comprehensible to those skilled in the art, the following description will be made in detail and completely with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present application.

Referring to fig. 1, the drawing is a schematic structural diagram of a long-distance wastewater discharge system for an offshore nuclear power plant according to an embodiment of the present application.

The embodiment of the application provides a long distance waste water discharging system for offshore nuclear power plant, includes: the system comprises a factory drainage module 1, a land drainage module 2 and a sea drainage module 3;

the plant drainage module 1 conveys waste water to the land drainage module 2 through a land drainage pipeline 4;

as shown in fig. 2, the land drain 4 is of double-pipe design;

the plant drainage module 1 comprises a waste water discharge device 11 and a fresh water conveying device 12; the waste water discharge device 11 conveys waste water to the land drainage module 2 through the inner sleeve 41 of the land drainage pipeline 4; the fresh water conveying device 12 conveys the fresh water to a position between the inner sleeve 41 and the outer sleeve 42 of the land area drainage pipeline 4, so that the position between the inner sleeve 41 and the outer sleeve 42 of the land area drainage pipeline 4 is filled with the fresh water;

the land drainage module 2 conveys waste water to the sea drainage module 3 through a sea drainage pipeline 5;

and the sea area drainage module 3 is used for discharging the wastewater to the ocean.

It will be appreciated that when a waste water leak occurs, the waste water in the inner casing 41 will leak into the fresh water between the inner casing 41 and the outer casing 42 rather than directly into the soil adjacent the buried pipe, avoiding damage to the surrounding soil and ecological environment.

In some possible implementations of the embodiment of the present application, in order to detect whether the waste water leaks, at least one monitoring point 43 is provided on the land drainage pipeline 4 for monitoring the quality of the fresh water between the inner casing 41 and the outer casing 42. When the waste water leaks, the salinity of the fresh water between the inner sleeve 41 and the outer sleeve 42 rises to generate a salinity alarm, and the waste water leakage condition can be monitored in real time by monitoring the quality of the fresh water.

In one example, there are a plurality of monitoring points 43, and one monitoring point 43 is provided at every predetermined distance on the land drain pipeline 4. Therefore, when the waste water leaks, the leakage interval can be quickly locked and the investigation range can be narrowed through salinity alarm and each monitoring point data. As an example, 1 monitoring point 43 is set every 1 kilometer on the land area discharge pipeline 4 to monitor the fresh water salinity, and when the inner casing 41 leaks, the monitoring points 43 on two sides adjacent to the leaking point can quickly monitor the fresh water salinity rise.

In some possible implementations of the embodiment of the present application, there are at least two land drainage pipelines 4, and one of the two land drainage pipelines 4 is used for standby.

It can be understood that once the salinity of the fresh water in one land drainage pipeline 4 is monitored to be overproof, the land drainage pipeline 4 can be immediately shut down and switched to the standby land drainage pipeline 4, the pipeline can be switched in time under the condition of leakage, the normal operation of the device is not influenced, the operation of a unit is not influenced, and the fault pipeline is convenient to evacuate water and isolate, and personnel can enter the pipeline to be repaired in time.

In some possible implementation manners of the embodiment of the application, the inner sleeve 41 of the land drainage pipeline 4 is made of glass fiber reinforced plastic, and the outer wall of the inner sleeve 41 is coated with anti-rust paint; the outer sleeve 42 of the land drainage pipeline 4 is made of concrete; the inner sleeve 41 and the outer sleeve 42 are provided with access holes for pipeline maintenance.

In some possible implementations of the embodiment of the present application, as shown in fig. 3, the land drainage module 2 includes: a high level drainage tower 21 and a fresh water drainage pump 22;

the high-level drainage tower 21 is arranged at the sea-land junction;

an inner sleeve 41 of the land drainage pipeline 4 is arranged in the high-level drainage tower 21 in an inverted U-shaped structure and is connected with the sea drainage pipeline 5;

it will be appreciated that the inner sleeve 41 is provided in the high level tower 21 in an inverted U-shaped configuration to prevent back-filling of seawater at the highest design tide level and to ensure that waste water flows to the drain.

Fresh water between the inner sleeve 41 and the outer sleeve 42 of the land drainage pipeline 4 is conveyed into the high-level drainage tower 21 and is drained to the ocean through the fresh water drainage pump 22.

In some examples, the land drainage module 2 further includes: a vacuum pump 23;

and the vacuum pump 23 is used for pumping non-condensable gas in the inverted U-shaped inner sleeve 41 in the high-level drainage tower 21 and pumping vacuum with a certain value at the same time, so that the wastewater can reach the top of the inverted U-shaped inner sleeve 41, and the lift of the wastewater pump 13 in the plant drainage module 1 is properly reduced.

The high-level drainage tower 21 is provided with a monitor for monitoring the salinity of fresh water therein, and the salinity of the fresh water passing through the high-level drainage tower 21 is monitored, so that the reliability and the accuracy of salinity monitoring can be further ensured.

In practical application, data of the monitoring points 43 and the high-level discharge tower 21 monitor are remotely transmitted to a control center of the fresh water drainage pump station, the control center is provided with a monitoring picture, the monitoring value and the alarm value of each monitoring point 43 are displayed, the leakage interval of the land drainage pipeline 4 can be quickly determined and the approximate position of leakage can be judged according to the alarm value of the monitoring point 43, and then the leakage point is searched through field inspection, so that the leakage point can be timely remedied. An access well is arranged at a proper position of the land drainage pipeline 4, access holes are formed in the pipe walls of the inner sleeve 41 and the outer sleeve 42, and personnel can enter the pipe for maintenance after the land drainage pipeline 4 is pumped out and isolated.

In some possible implementations of the embodiment of the present application, at least one drain cap 51 is disposed on the sea area drain pipe 5 as a drain port for discharging the waste water into the sea.

In practical application, the number of the drain caps 51 can be set according to the requirement of discharge flow, and the number and the distance of the drain caps 51 are set by comprehensively considering the requirements of temperature rise of a drain area, temperature rise area, shape control of the temperature rise area and the like. As an example, 3 to 5 drain caps 51 are provided at the end of the sea area drain pipe 5 at a certain interval. The drain cap 51 may be provided with a drain port for discharging wastewater into the sea, and the drain port of the drain cap 51 may be provided with an isolation shutter to ensure reliable isolation of the sea drain pipe 5 during maintenance.

It should be noted that the elevation of the drain cap 51 is designed to be submerged by seawater when the low tide level is designed, and the drain port of the drain cap 51 is provided with an isolation flashboard to ensure reliable isolation of the drain pipeline during maintenance.

In some examples, there are at least two sea drainage pipes 5, one for each, to prevent damage to the pipes from affecting the normal operation of the unit.

In practical application, the sea area drainage pipeline 5 can be a single-layer pipeline, the inner diameter Dn2800 is larger, the flow rate of water passing is about 2.48m/s, the pipeline material is a glass fiber reinforced plastic water supply pipe, the pipe wall is coated with anti-rust paint, and wastewater can be uniformly discharged to a special utilization area in the sea through the sea area drainage pipeline 5.

In some possible implementation manners of the embodiment of the present application, the sea drainage module 3 includes: a discharge port management fence 31;

a drain port management fence 31 for preventing the drain cap 51 from being collided.

It will be appreciated that the vent management pen 31 also avoids the risk of the drain cap 51 encountering a collision with an external vessel while isolating the operations of the gate operator and diver. In some examples, a warning light is provided on the discharge port management fence 31 to remind the ship to sail away from the area of the drain cap 51 in advance.

In some possible implementations of the embodiments of the present application, the waste water discharge device 11 includes: a looped network 16, a waste water pump 13 and at least one suction sump 14;

and the water suction pool 14 is used for collecting and storing the wastewater to be discharged into the sea.

As an example, the wastewater may include concentrated seawater generated during a recycle cooling process, brine generated during a seawater desalination process, and nuclear island wastewater qualified for disposal.

The waste water pump 13 is used for conveying the waste water in the water suction pool 14 to the ring network 16 through a pipeline, the ring network 16 is used for gathering the waste water, and the waste water is conveyed to the land drainage module 2 through the inner sleeve 41 of the land drainage pipeline 4.

Fresh water delivery device 12, comprising: a fresh water pool 15 and a fresh water replenishing pump 17;

the fresh water tank 15 is used for storing fresh water. The fresh water replenishing pump 17 is used for pumping fresh water in the fresh water pool 15 and filling the fresh water into the space between the inner sleeve 41 and the outer sleeve 41 of the land area discharge pipeline 5.

The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the matters not described in detail in this application.

Claims (11)

1. A long-range wastewater discharge system for an offshore nuclear power plant, the system comprising: the system comprises a factory area drainage module, a land area drainage module and a sea area drainage module;

the plant area drainage module conveys waste water to the land area drainage module through a land area drainage pipeline;

the land drainage pipeline is designed into a double-sleeve pipe;

the plant area drainage module comprises a waste water discharge device and a fresh water conveying device; the waste water discharge device conveys the waste water to the land drainage module through an inner sleeve of the land drainage pipeline; the fresh water conveying device conveys fresh water to a position between an inner sleeve and an outer sleeve of the land area drainage pipeline, so that the position between the inner sleeve and the outer sleeve of the land area drainage pipeline is filled with the fresh water;

the land drainage module conveys the wastewater to the sea drainage module through a sea drainage pipeline;

the sea area drainage module is used for discharging the wastewater to the ocean.

2. The long distance wastewater discharge system for offshore nuclear power plants according to claim 1, wherein said land drainage pipeline is provided with at least one monitoring point for monitoring the quality of fresh water between said inner and outer sleeves.

3. Long-distance wastewater discharge system for offshore nuclear power plants according to claim 2,

at least two land drainage pipelines are provided, and one of the two land drainage pipelines is used for standby.

4. The offshore nuclear power plant long-distance wastewater discharge system according to claim 2, wherein the inner sleeve of the land drainage pipeline is made of glass fiber reinforced plastic, and the outer wall of the inner sleeve is coated with anti-rust paint; the outer sleeve of the land drainage pipeline is made of concrete; and the inner sleeve and the outer sleeve are provided with access holes for pipeline maintenance.

5. The offshore nuclear power plant long-distance wastewater discharge system according to any of claims 2 to 4, wherein there are a plurality of monitoring points, and one monitoring point is provided on the land drainage pipeline at every predetermined distance.

6. The offshore nuclear power plant long-distance wastewater discharge system of claim 1, wherein the land drainage module comprises: a high-level drainage tower and a fresh water drainage pump;

the high-level drainage tower is arranged at a sea-land junction;

the inner sleeve of the land drainage pipeline is arranged in the high-level drainage tower to be of an inverted U-shaped structure and is connected with the sea drainage pipeline;

fresh water between the inner sleeve and the outer sleeve of the land drainage pipeline is conveyed into the high-level drainage tower and is discharged to the ocean through the fresh water drainage pump.

7. The offshore nuclear power plant long-distance wastewater discharge system of claim 6, wherein the land drainage module further comprises: a vacuum pump;

the vacuum pump is used for pumping non-condensable gas in the inverted U-shaped inner sleeve in the high-level drainage tower and pumping vacuum with a certain numerical value.

8. The offshore nuclear power plant long-distance wastewater discharge system of claim 6, wherein the high-level wastewater discharge tower is provided with a monitor for monitoring fresh water salinity inside the high-level wastewater discharge tower.

9. The offshore nuclear power plant long-distance wastewater discharge system of claim 1, wherein at least one drain cap is provided on the sea drainpipe as a discharge port for discharging the wastewater into the sea.

10. The offshore nuclear power plant long-distance wastewater discharge system of claim 9, wherein the sea level water discharge pipeline has at least two.

11. The offshore nuclear power plant long-distance wastewater discharge system of claim 9, wherein the sea drainage module comprises: a discharge port management pen;

the drain port management fence for preventing the drain cap from being collided.

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