CN207486768U - A kind of continuous steam generator of nuclear power station - Google Patents

Abstract

The utility model provides a kind of continuous steam generator of nuclear power station, including：Feed water distributor box, heat-transfer pipe, reallocation header and steam header；The feedwater distributor box, reallocation header and steam header are sequentially communicated；Wherein, the feedwater distributor box is connected by the heat-transfer pipe with the reallocation header, and the reallocation header is connected by the heat-transfer pipe with the steam header.The continuous steam generator of nuclear power station provided by the utility model, it is different from traditional continuous steam generator, reallocation header is added in once through steam generator, for alleviating due to the uneven flow resistance problem of non-uniform brought that flows and conduct heat, particularly alleviate under low-power and steam quality unevenness problem during Load Regulation, header of reallocating simultaneously is also provided with heat-transfer pipe manhole, it is operated convenient for the inservice inspection and plugging of heat-transfer pipe, which improves stabilization and the safety of steam generator operation.

Description

A once-through steam generator for a nuclear power plant

technical field

The utility model relates to a steam generator for a nuclear power plant, in particular to a direct-flow steam generator for a nuclear power plant.

Background technique

There are two types of steam generators widely used in pressurized water reactor nuclear power plants, one is a saturated steam generator with a steam-water separator, and the other is a once-through steam generator. For the saturated steam generator, the water in the primary circuit flows in the tube bundle composed of U-shaped tubes connected by the tube plate, and a steam-water separator and a steam drying device are installed above the tube bundle. The saturated steam generator has the advantages of large heat transfer coefficient, large water storage volume, and low requirements on the feed water and steam control system, but the saturated steam temperature and pressure are relatively low, and the corresponding secondary circuit efficiency is low. In addition, the structure of the steam generator is complex, Big size. The outlet of the once-through steam generator is usually superheated steam, which has high thermal efficiency. Its heat transfer tube is a straight tube without a steam-water separator, steam drying device, etc., which is easy to manufacture and assemble. However, the water capacity of the secondary circuit of the once-through steam generator is small, and the requirements for water supply control are very high.

In recent years, small reactors have developed rapidly, and once-through steam generators have been widely used due to their small size and high thermal efficiency. However, due to the small power of the small reactor, the load adjustment requirements are relatively high, resulting in more obvious flow and heat transfer inhomogeneity in the heat transfer tube of the once-through steam generator.

Utility model content

Aiming at the deficiencies of the prior art, the utility model proposes a direct-flow steam generator of a nuclear power plant.

The utility model provides a once-through steam generator of a nuclear power plant, which comprises: a water supply distribution box, a heat transfer pipe, a redistribution header and a steam header; the water supply distribution box, the redistribution header and the steam header are connected in sequence ; Wherein, the water distribution tank communicates with the redistribution header through the heat transfer pipe, and the redistribution header communicates with the steam header through the heat transfer pipe.

Preferably, a heat transfer pipe inspection hole is also included; the inspection hole communicates with the redistribution header, and the inspection hole is sealed by a flange.

Preferably, the feed water distribution tank is configured to evenly distribute feed water to heat transfer tubes in communication with the redistribution header.

Preferably, the steam header is configured to uniformly mix the steam entering the main steam conduit.

Compared with the prior art, the utility model has the following beneficial effects:

1. The once-through steam generator of the nuclear power plant provided by the utility model is different from the traditional once-through steam generator. A redistribution header is added to the once-through steam generator to alleviate the problems caused by uneven flow and heat transfer. The problem of uneven flow resistance, especially to alleviate the problem of uneven steam quality under low power and load adjustment, and at the same time, the redistribution header is also equipped with inspection holes for heat transfer tubes, which is convenient for in-service inspection and plugging operations of heat transfer tubes. This design improves the stability and safety of the steam generator operation.

Description of drawings

Fig. 1 is a schematic diagram of a once-through steam generator of a nuclear power plant according to a preferred embodiment of the present invention.

Among them: 1—reactor coolant inlet; 2—reactor coolant flow channel; 3—once-through steam generator; 4—reactor coolant outlet; 5—feed water; 6—feed water distribution box; 7—heat transfer tube; 8— Inspection hole of heat transfer tube; 9—redistribution header; 10—steam header; 11—main steam.

Detailed ways

In order to make the above purpose, features and advantages of the utility model more obvious and understandable, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the once-through steam generator of a nuclear power plant comprises: a feedwater distribution box 6, a heat transfer pipe 7, a redistribution header 9 and a steam header 10; the feedwater distribution box 6, a redistribution header 9 and The steam headers 10 are connected in sequence; wherein, the water distribution tank 6 communicates with the redistribution header 9 through the heat transfer tube 7, and the redistribution header 9 communicates with the steam header 9 through the heat transfer tube 7 The header 10 is connected.

The once-through steam generator of the nuclear power plant also includes a heat transfer tube inspection hole 8, which is convenient for the in-service inspection and plugging operation of the heat transfer tube. The inspection hole 8 is in communication with the redistribution header 9, and the inspection hole 8 is sealed by a flange

The feed water distribution box 6 is configured to evenly distribute the feed water to the heat transfer tubes 7 communicating with the redistribution header 9, so that the feed water evenly enters the heat transfer tubes of the steam generator.

The steam header 10 makes the steam mix uniformly and the pressure stable before entering the main steam pipeline.

The redistribution header 9 in the once-through steam generator of a nuclear power plant is used to alleviate the problem of uneven flow resistance caused by uneven flow and heat transfer, especially to alleviate the problem of uneven steam quality at low power and load regulation , the design improves the stability and safety of the steam generator operation.

Specifically, as shown in Figure 1, the once-through steam generator of the nuclear power plant of this embodiment mainly includes a feed water distribution box 6, a heat transfer pipe 7, a redistribution header 9, a heat transfer pipe inspection hole 8 and a steam header 10 . Under normal operating conditions, the reactor coolant hot fluid enters the reactor coolant flow channel 2 from the reactor coolant inlet 1, and after transferring heat to the once-through steam generator 3, the cold fluid flows out from the reactor coolant outlet 4. The feed water 5 enters the feed water distribution box 6, and the feed water enters the heat transfer tube 7 evenly, and enters the redistribution header 9 after being heated. The fluid is mixed evenly in the redistribution header 9 and then enters the next heat transfer tube. Set up multiple redistribution headers to alleviate the problem of uneven flow resistance caused by uneven flow and heat transfer, especially to alleviate the problem of uneven steam quality at low power and load regulation. The fluid enters the steam header 10 after passing through the last heat transfer tube, and enters the main steam pipeline after mixing stably. When the heat transfer tube needs to be overhauled or plugged, the heat transfer tube inspection hole 8 is opened for in-service inspection and tube plugging.

Compared with the prior art, this embodiment has the following beneficial effects:

1. The once-through steam generator of the nuclear power plant provided in this embodiment is different from the traditional once-through steam generator. A redistribution header is added to the once-through steam generator to alleviate the problems caused by uneven flow and heat transfer. The problem of uneven flow resistance, especially to alleviate the problem of uneven steam quality under low power and load adjustment, and at the same time, the redistribution header is also equipped with inspection holes for heat transfer tubes, which is convenient for in-service inspection and plugging operations of heat transfer tubes. This design improves the stability and safety of the steam generator operation.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant information, please refer to the description of the method part.

Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Apparently, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalent technologies, the utility model is also intended to include these modifications and variations.

Claims (4)

1. a kind of continuous steam generator of nuclear power station, which is characterized in that including：Feed water distributor box, heat-transfer pipe, connection of reallocating Case and steam header；The feedwater distributor box, reallocation header and steam header are sequentially communicated；Wherein, the feedwater distributor box It is connected by the heat-transfer pipe with the reallocation header, the reallocation header passes through the heat-transfer pipe and the steam header Connection.

2. the continuous steam generator of nuclear power station as described in claim 1, which is characterized in that further include heat-transfer pipe maintenance Hole；The manhole and the reallocation header unicom, the manhole pass through flange seal.

3. the continuous steam generator of nuclear power station as described in claim 1, which is characterized in that the feedwater distributor box is through matching It puts with the heat-transfer pipe that evenly distributes to being connected with the reallocation header of feeding water.

4. the continuous steam generator of nuclear power station as described in claim 1, which is characterized in that the steam header is configured Uniformly to be mixed to the steam for entering main steam line.