CN103212548B - A kind of rinse-system for clearing up local sedimentation in the nuclear power plant and method - Google Patents

Abstract

The invention relates to a flushing system for cleaning up local deposits in a nuclear power plant, wherein the nuclear power plant is equipped with a desalted water plant (13) and a water intake pump room (12) for circulating water and important plant water systems, and the flushing system includes The ultrafiltration wastewater recovery tank (1) and the flushing water pump (2) installed in the desalinated water plant (13), the inlet of the flushing water pump (2) is connected to the ultrafiltration wastewater recovery tank (1), and the outlet of the flushing water pump (2) There is a flushing pipeline (3) at the end. The present invention also provides a method for cleaning local deposits in a nuclear power plant by using the flushing system. Using the flushing system and method of the present invention solves the problem of local siltation in the pump room of the nuclear power plant in the high-silt sea area, improves the operating safety of the circulating water in the pump room and the important plant water system, increases the utilization rate of fresh water, and saves water .

Description

A flushing system and method for cleaning local deposits in a nuclear power plant

technical field

The invention belongs to the technical field of guaranteeing safe operation of nuclear power plants, and in particular relates to a flushing system and method for cleaning local deposits in nuclear power plants.

Background technique

Usually, SEC/CRF drainage tunnel 4, SEC/CRF ram 5, SEC/CRF grid decontamination machine 6 (connected with motor, motor Indicated by the symbol M), SEC/CRF drum filter 7, SEC/CRF suction culvert 8, etc. (as shown in Figure 1), and connected together through pipelines, generally the system also has a water suction culvert connection valve 9, Pressure gauge 11 and differential pressure gauge conduit 10 and other components.

In the water intake pump room of the nuclear power plant in the high-sediment sea area, although the circulating water and the important plant water system have independent flow channels, which will not cause flow channel silting, the positions of the differential pressure gauge conduits in the system, the connection valves of the suction culvert, etc. It is easy to form sediment deposits, which will cause the problem of inaccurate or unable to measure the pressure difference, and the connection valve of the suction culvert cannot be opened.

In addition, for nuclear power plants that use fresh water as the water source for desalinated water, the raw water for the desalinated water system generally comes from the production water system of the fresh water plant, and the water quality of the produced water generally meets the drinking water quality standard. Compared with sea water, ultrafiltration wastewater is very clean, if not recycled, it will cause serious waste of resources.

Contents of the invention

In view of the defects in the prior art, an object of the present invention is to provide a flushing system and method for cleaning up local deposits in nuclear power plants. Adopting the flushing system can not only improve the operating safety of circulating water and important plant water systems, Moreover, it can increase the utilization rate of fresh water and save water.

Another object of the present invention is to provide a method for cleaning local deposits in a nuclear power plant using the above-mentioned flushing system.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a flushing system for cleaning up local deposits in nuclear power plants, wherein the nuclear power plant is equipped with a desalinated water plant and a water intake pump room for circulating water and important plant water systems. The flushing system includes an ultrafiltration wastewater recovery pool and a flushing water pump located in the desalinated water plant. The inlet of the flushing water pump is connected to the ultrafiltration wastewater recovery pool, and the outlet of the flushing water pump is provided with a flushing pipeline.

Further, the flushing pipeline is connected with the circulating water and the connecting parts at the sediment deposit position in the important plant water system through several branches connected thereto.

Furthermore, the connecting parts at the deposit position in circulating water and important plant water systems refer to the suction underdrain connecting valves and differential pressure gauge conduits arranged in the water intake pump room.

The present invention provides a method for cleaning local silt in a nuclear power plant using the above-mentioned flushing system, comprising the following steps: recycling the ultrafiltration wastewater into the ultrafiltration wastewater recovery pool, using a flushing water pump to extract the ultrafiltration wastewater, and flushing the ultrafiltration wastewater through the flushing pipeline. The filtered waste water is transported to the circulating water and the place where the sediment deposits in the important plant water system for washing.

Further, the place where the sediment deposits in the circulating water and the important plant water system refers to the connection valve and the differential pressure gauge conduit of the suction culvert.

The flushing system provided by the present invention uses the recovered ultrafiltration waste water that does not contain any chemical additives in the pretreatment of desalinated water as the flushing water to intermittently flush the circulating water of the nuclear power plant and the differential pressure gauge conduit and the connection valve of the water suction culvert of the important plant water system It not only solves the problem of local siltation in the pump room of the nuclear power plant in the high-sediment sea area, improves the operation safety of circulating water and important plant water systems, but also increases the utilization rate of fresh water and saves water.

Description of drawings

Fig. 1 is a kind of structure schematic diagram that is used for cleaning up the flushing system of nuclear power plant local silt provided by the present invention;

Fig. 2 is a flowchart of a method for cleaning up local deposits in a nuclear power plant provided by the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a desalinated water plant 13 is usually installed in the nuclear power plant, and the pretreatment process of the desalted water plant 13 generally adopts ultrafiltration, and the waste water after the ultrafiltration is used to flush the circulating water and water in the pump room of the nuclear power plant. The important plant water system, circulating water and some pipelines in the important plant water system are arranged in the water intake pump room 12.

A flushing system for cleaning local deposits in nuclear power plants provided by the present invention includes an ultrafiltration wastewater recovery pool 1 and a flushing water pump 2 arranged in a desalinated water plant 13, the inlet end of the flushing water pump 2 and the ultrafiltration wastewater recovery pool 1 connected, and the outlet end of the flushing water pump 2 is provided with a flushing pipeline 3.

In a specific embodiment of the present invention, the flushing pipeline 3 is connected with circulating water and important plant water systems that are prone to silt deposition through several branches connected thereto (not limited to this application mode), these The communication parts usually include the suction underdrain connection valve 9 and the differential pressure gauge conduit 10 arranged in the water intake pump room 12 . When in use, by controlling the start and stop of the flushing water pump 2, the silt accumulated in the connecting parts is intermittently flushed to ensure the smoothness of the pipeline.

As shown in Fig. 2, a kind of method for cleaning up local silt in nuclear power plant provided by the present invention specifically comprises:

1) Recycle the ultrafiltration wastewater without any chemical additives to the ultrafiltration wastewater recovery pool 1, where the ultrafiltration wastewater includes concentrated water, fast flushing water, and backwash water without chemical additions from the ultrafiltration system, and is discharged through wastewater The ditch is collected into the ultrafiltration wastewater recovery tank 1.

2) Use the flushing water pump 2 to lift the ultrafiltration wastewater entering the ultrafiltration wastewater recovery tank 1 to the water intake pump room 12, and supply it to the circulating water and the sludge in the important plant water system through the flushing pipeline 3 and its branches respectively. The location where the sand is deposited (such as the suction underdrain connection valve 9 and the differential pressure gauge conduit 10) shall be flushed.

During the flushing process, according to the liquid level of the ultrafiltration wastewater recovery tank 1, the start and stop of the flushing water pump 2 are controlled to intermittently flush the silt accumulated in the circulating water and the important plant water system. That is, when the ultrafiltration wastewater recovery tank 1 reaches the high liquid level, start the flushing water pump 2, and flush the circulating water, the suction underdrain connection valve 9 and the differential pressure gauge conduit 10 of the important factory water system through the flushing pipeline 3; When the waste water recovery tank 1 reaches a low liquid level, the flushing water pump 2 is stopped to stop flushing.

The above-mentioned embodiments are only illustrations of the present invention, and the present invention can also be implemented in other specific ways or other specific forms without departing from the gist or essential features of the present invention. Accordingly, the described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention should be described by the appended claims, and any changes equivalent to the intention and scope of the claims should also be included in the scope of the present invention.

Claims (2)

1., for clearing up a rinse-system for local sedimentation in the nuclear power plant, wherein, it is provided with in nuclear power plant and removes The water plant (12) of salt solution factory building (13) and recirculated water and essential service water system, its feature exists In, described rinse-system includes the ultrafiltration Sewage treatment pond (1) being located at demineralized water workshop (13) and rinses Water pump (2), the entrance point of flush water pump (2) is connected with ultrafiltration Sewage treatment pond (1), flush water pump (2) the port of export is provided with flushing line (3)；Flushing line (3) passes through some coupled branch roads It is connected with the communication means of Sediment Siltation position in recirculated water and essential service water system, recirculated water and weight The communication means wanting service water system interior alluvial position refers to that the water suction closed conduit being located in water plant connects Valve (9) and differential manometer conduit (10).

2. use the method that the rinse-system described in claim 1 clears up local sedimentation in the nuclear power plant, its It is characterised by, comprises the following steps: by ultrafiltration Sewage treatment to ultrafiltration Sewage treatment pond, use and rinse Water pump extraction ultrafiltration waste water, and by flushing line, ultrafiltration waste water is delivered to recirculated water and essential service water In system, Sediment Siltation position is rinsed.