JPH085785A - Site steam supply system in reactor power plant - Google Patents

Abstract

PURPOSE:To reduce the steam amount supplied from an auxiliary boiler system by connecting steam converter systems in a plurality of plants each other, and enabling supplying the generated steam to each other plant. CONSTITUTION:For instance, when plants A and B operate and a plant C is stopped, the steam converter systems 2A and 2B of plants A and B operate and the steam converter system 2C and the auxiliary boiler system of plants C are stopped. The steam generated from the steam converter systems 2A and 2B is supplied through a steam supply main pipe 9 and steam supply pipes 3 to each steam utility 4, 4 and its returning steam is recovered through condensate recovery pipes 5 etc., to a supply water tank 10, which is transported to the steam converter systems 2A and 2B of plants A and B and reused as supply water. The auxiliary boiler system 1 of which steam supply is expensive, is not necessarily operated depending on the situation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to on-site steam supply equipment for a nuclear power plant for supplying steam to the in-house by utilizing the heat of a nuclear reactor of the nuclear power plant.

[0002]

2. Description of the Related Art A nuclear power plant is installed with various steam loads, and an auxiliary boiler facility and a steam converter facility are provided as steam generators for supplying steam to the respective steam loads.

FIG. 3 is a system diagram showing a conventional steam supply facility for supplying steam to a steam load in a nuclear power plant. In FIG. 3, the auxiliary boiler equipment 1 generates steam by using heavy oil, electricity or the like as a heat source, while the steam converter equipment 2 uses heat generated by the nuclear reactor as a heat source and exchanges heat with the furnace steam or turbine bleed air to generate in-house steam. It is what is generated. While the plant is operating, steam generated from the steam converter equipment 2 is normally supplied to each steam use load in the plant, while when the reactor heat cannot be used such as when the plant is stopped, each steam use load in the plant is supplied from the auxiliary boiler facility 1. To supply steam to.

The steam generated in the auxiliary boiler equipment 1 or the steam converter equipment 2 is supplied to each steam use load 4, 4 through a steam supply pipe 3. The return steam discharged from the steam use loads 4 and 4 is guided to the condensate recovery device 6 through the condensate recovery pipe 5. Next, the condensate recovered by the condensate recovery device 6 is passed through the condensate transfer pipe 7 and the auxiliary boiler equipment 1
Alternatively, it is transferred to the steam converter facility 2 and reused as water supply for the boiler or steam converter.

[0005]

In the conventional steam supply equipment for a nuclear power plant, a steam converter equipment 2 is provided for each plant, and the steam converter equipment 2 utilizes the reactor heat during normal operation of the plant. By generating inexpensive steam and supplying it to each steam use load 4, 4 in the plant, the heavy oil cost or electricity cost of the auxiliary boiler facility 1 is reduced.

However, when the plant is stopped due to periodic inspection of the plant, the steam converter equipment 2 is stopped, so the auxiliary boiler equipment 1 is operated and expensive steam generated from the auxiliary boiler equipment 1 is used for each steam in the plant. Supplying to loads 4 and 4.

Further, the amount of steam consumed by each steam use load 4 and 4 in the plant is larger than that during normal plant operation, and the total amount of steam used during regular plant inspection suspension is large, and the ratio thereof is several times. Therefore, by installing the steam converter equipment 2, although the cost required for the in-house steam supply during the normal operation of the plant can be reduced, the cost required for the in-house steam supply when the plant is stopped by the periodic inspection, that is, the auxiliary boiler equipment 1 Operating costs are high, which is a heavy burden.

The present invention has been made in consideration of the above-mentioned circumstances, and an object thereof is to provide a reasonable in-house steam supply facility for a nuclear power plant by reducing the cost required for supplying in-house steam even when the plant is stopped. To do.

[0009]

In order to solve the above-mentioned problems, the first aspect of the present invention provides an auxiliary boiler facility for supplying steam to each steam use load in a plurality of plants using heavy oil, electricity or the like as a heat source. And a steam converter facility that is provided in each of the plurality of plants and that supplies steam to the steam use loads by using the reactor heat as a heat source, and these steam converter facilities are connected to each other by piping, and the steam converters are connected to each other. It is characterized in that the steam generated from the equipment can be mutually supplied to a plurality of plants.

According to a second aspect of the present invention, the auxiliary boiler equipment according to the first aspect and the steam converter equipment provided in each plant are connected to a steam supply mother pipe, and steam is supplied from the steam supply mother pipe to each steam use load in the plant. It is characterized by supplying.

According to a third aspect of the present invention, an auxiliary boiler facility for supplying steam to each steam use load in the plant by using heavy oil or electricity as a heat source, and reactor heat to each steam use load as a heat source are supplied to each of the plurality of plants. A steam converter facility for supplying steam is provided, and each plant is connected by a steam communication pipe so that either of the steam for the auxiliary boiler facility and the steam converter facility can be supplied from one plant to the other plant. It is characterized by having done.

[0012]

According to the present invention, the steam converter equipment in a plurality of plants is connected to each other by piping so that the steam generated from each steam converter equipment can be mutually supplied to the plurality of plants. The steam generated in the steam converter equipment can be supplied to each steam use load including not only the operating plant but also the stopped plant. As a result, the amount of steam supplied from the auxiliary boiler equipment can be reduced.

According to a second aspect of the present invention, the auxiliary boiler equipment according to the first aspect and the steam converter equipment provided in each plant are connected to a steam supply mother pipe, and the steam is supplied from the steam supply mother pipe to each steam use load in the plant. By supplying
Similarly to claim 1, the steam generated in the steam converter facility of the operating plant can be supplied to each steam use load including the stopped plant.

According to the third aspect of the present invention, the auxiliary boiler equipment and the steam converter equipment are provided in each of the plurality of plants, and the steam communication pipes are used to connect the plants to each other. Is supplied from one plant to the other plant, the steam generated in the steam converter facility of the operating plant can be supplied to the stopped plant. Further, by connecting each plant with a steam communication pipe, the auxiliary boiler equipment of each plant can be backed up from the auxiliary boiler equipment of another plant, so that its capacity can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing a first embodiment of on-site steam supply equipment of a nuclear power plant according to the present invention. Note that the same or corresponding portions as those of the conventional configuration will be described using the same reference numerals as those in FIG.

In this first embodiment, an auxiliary boiler equipment 1 is provided as a steam generator as in the conventional example, and this auxiliary boiler equipment 1 is connected to a steam supply mother pipe 9 by a pipe 8. Further, in the on-site steam supply equipment of this embodiment, the steam converter equipment 2A, 2 is provided for each of the plants A, B, C.
B and 2C are provided. The steam supply port of the steam converter equipment 2A of the plant A is connected to the steam supply mother pipe 9 by a pipe 8A. Similarly, the steam supply port of the steam converter equipment 2B of the plant B is a pipe 8B,
The steam supply ports of the steam converter equipment 2C of the plant C are respectively connected to the steam supply mother pipe 9 by a pipe 8C.

Each of the plants A, B, and
The steam supply pipes 3 for supplying steam to the respective steam use loads 4 and 4 of C are connected to each other. Each steam use load 4,4
Is connected to a condensate recovery pipe 5, the condensate recovery pipe 5 is connected to a condensate transfer pipe 7 via a condensate recovery device 6, and the condensate transfer pipe 7 is connected to a water supply tank 10. Then, the water supply tank 10 is connected to the steam converter equipment 2A, 2 of each plant A, B, C via the water supply transfer pipe 11.
B, 2C and auxiliary boiler equipment 1 are connected.

Therefore, the return steam from each steam use load 4, 4 is guided to the condensate recovery device 6 through the condensate recovery pipe 5, and the condensate recovered by the condensate recovery device 6 is transferred to the condensate. The steam converter equipment 2A, 2B, 2C and the auxiliary boiler equipment 1 of each plant A, B, C are transferred to the water supply tank 10 through the pipe 7 and further through the water supply transfer pipe 11.
To be reused as water supply.

Next, the operation of this embodiment will be described.

In this embodiment, one of the steam converter equipment 2A, 2B, 2C and the auxiliary boiler equipment 1 of each plant A, B, C as a steam generator connected to the steam supply mother pipe 9 is operated. For example, assuming that the plants A and B are operating now and the plant C is stopped, the steam converter facilities 2A and 2B of the plants A and B are operated and the steam converter of the plant C is operated. The equipment 2C and the auxiliary boiler equipment 1 are stopped.

The steam generated from the steam converter equipment 2A, 2B is supplied from the steam supply mother pipe 9 through the steam supply pipe 3 to the steam use loads 4, 4. The returned steam from each steam use load 4, 4 is recovered in the water supply tank 10 via the condensate recovery pipe 5, the condensate recovery device 6, and the condensate transfer pipe 7, and further via the water supply transfer pipe 11 to the plants A, B. Is transferred to the steam converter equipment 2A, 2B for reuse as water supply.

As described above, according to this embodiment, in the conventional plant C in which the plant is stopped, the auxiliary boiler equipment 1 has to be operated and expensive auxiliary boiler steam has to be supplied. However, in this embodiment, the cost is low. The steam converter steam can be supplied to each steam use load in the plant, and the cost required for supplying the steam in the plant can be significantly reduced.

It is also possible to operate any one of the steam converter equipment 2A, 2B, 2C as the steam generator and the auxiliary boiler equipment 1, and to operate all of the steam converter equipment 2A, 2B, 2C. Alternatively, if all three plants A, B, and C are stopped, it is possible to operate only the auxiliary boiler equipment 1.

Further, in this embodiment, the plants A, B and C are
However, the present invention is not limited to this and can be applied to a plurality of plants of 2 plants or 4 plants or more.

FIG. 2 is a system diagram showing a second embodiment of the on-site steam supply facility of the nuclear power plant according to the present invention. The same parts as those in the first embodiment will be described with the same reference numerals.

In this embodiment, a boiler facility 1 and a steam converter facility 2 are provided for each of the plants A and B, and the steam supply facilities are shared between the plants A and B. That is, the plant A and the plant B are respectively provided with the steam converter equipment 2 and the auxiliary boiler equipment 1, and the steam converter equipment 2 and the auxiliary boiler equipment 1 can be switched and operated depending on the operating conditions of the plant.

The auxiliary boiler equipment 1 and the steam converter equipment 2 have an auxiliary boiler pipe 12 and a steam converter outlet pipe 13, respectively.
And a steam converter outlet pipe 13 are connected to a pipe 14 and a pipe 15, respectively.
15 can be supplied to each steam use load of another plant via each on-off valve 14a, 15a and the inter-plant tie line 16 as a steam communication pipe.

Therefore, for example, the steam generated from the steam converter facility 2 of the plant A is supplied to the steam use loads 4 and 4 in the plant through the steam converter outlet pipe 13 and the steam supply pipe 3, while the pipe 15 and the opening / closing are provided. Valve 1
5a and the tie line 16 between plants to plant B
Be transferred to. In the plant B, each steam usage load 4 is passed through the on-off valve 15a, the pipe 15 and the steam supply pipe 3.
4 is supplied.

Further, for example, the steam generated from the auxiliary boiler equipment 1 of the plant A is supplied to the respective steam use loads 4 and 4 in the plant via the auxiliary boiler pipe 12 and the steam supply pipe 3, while the pipe 14 and the on-off valve. 14a and the tie line 16 between plants, and is transferred to the plant B. In plant B, on-off valve 14a, pipe 14 and steam supply pipe 3
Is supplied to each steam use load 4 and 4.

As described above, according to the present embodiment, for example, when one of the two plants is in operation and the remaining one is stopped for the periodic inspection, the steam converter equipment of the operating plant is used. By supplying steam from 2 to the stopped plant, the operating cost of the auxiliary boiler equipment 1 of the stopped plant can be reduced. Also,
A large flow rate of steam is required at the time of starting and stopping the plant. In this case, the steam generated by the auxiliary boiler facility 1 may be backed up and supplied to the plant during the start and stop operations of the plant.

Therefore, the capacity of the auxiliary boiler equipment 1 of each plant can be expected to be backed up from the auxiliary boiler equipment 1 of another plant.
It is possible to reduce the capacity as compared with the case of not providing.

In this embodiment, the two plants A and B are used.
Although the example of the plant has been described, the present invention is not limited to this and can be applied to a case where the inter-plant tie line 16 is provided in a plurality of plants of three or more plants.

[0034]

As described above, according to the first aspect of the present invention.
According to the above, steam converter equipment in multiple plants is connected to each other by piping, and steam generated from each steam converter equipment can be mutually supplied between multiple plants. The generated steam can be supplied to each steam use load including not only the operating plant but also the stopped plant. As a result, it is possible to reduce the amount of steam supplied from the auxiliary boiler equipment, and it is possible to significantly reduce the cost required for supplying steam to the plant.

According to claim 2, the auxiliary boiler equipment according to claim 1 and the steam converter equipment provided in each plant are connected to a steam supply mother pipe, and from this steam supply mother pipe to each steam use load in the plant. By supplying steam, the same effect as in claim 1 can be obtained.

According to the third aspect of the present invention, the auxiliary boiler equipment and the steam converter equipment are provided in each of the plurality of plants, and the plants are connected by the steam communication pipe, and either the auxiliary boiler equipment or the steam converter equipment is connected. By supplying steam from one plant to the other,
The steam generated in the steam converter facility of the operating plant can be supplied to the stopped plant, and the same effect as that of claim 1 can be obtained.

Further, by connecting each plant with a steam communication pipe, the auxiliary boiler equipment of each plant can be backed up from the auxiliary boiler equipment of another plant, so that its capacity can be reduced.

[Brief description of drawings]

FIG. 1 is a system diagram showing a first embodiment of on-site steam supply equipment of a nuclear power plant according to the present invention.

FIG. 2 is a system diagram showing a second embodiment of the on-site steam supply facility of the nuclear power plant according to the present invention.

FIG. 3 is a system diagram showing a conventional steam supply facility for supplying steam to a steam load in a nuclear power plant.

[Explanation of symbols]

 1 Auxiliary boiler equipment 2 Steam converter equipment 2A, 2B, 2C Steam converter equipment 3 Steam supply piping 4 Steam usage load 5 Condensate recovery piping 6 Condensate recovery equipment 7 Condensate transfer piping 8 Piping 8A, 8B, 8C piping 9 Steam supply Mother pipe 10 Water tank 11 Water transfer pipe 12 Auxiliary boiler pipe 13 Steam converter outlet pipe 14 Pipe 15 Pipe 16 Inter-plant tie line (steam communication pipe) A, B, C plant

Claims (3)

[Claims] 1. An auxiliary boiler facility for supplying steam to respective steam use loads in a plurality of plants using heavy oil, electricity or the like as a heat source, and each of the above steams provided in each of the plurality of plants and using reactor heat as a heat source. It has a steam converter facility for supplying steam to the load used, these steam converter facilities are connected to each other by piping, and the steam generated from each steam converter facility is configured to be able to be mutually supplied between a plurality of plants. On-site steam supply facility for a nuclear power plant. 2. The auxiliary boiler equipment and the steam converter equipment provided in each plant are connected to a steam supply mother pipe, and steam is supplied from this steam supply mother pipe to each steam use load in the plant. The on-site steam supply facility of the nuclear power plant according to claim 1. 3. Auxiliary boiler equipment for supplying steam to each steam use load in the plant by using heavy oil, electricity or the like as a heat source, and supplying steam to each steam use load using the reactor heat as a heat source for each of the plurality of plants. A steam converter facility is provided to connect each plant with a steam communication pipe, and it is possible to supply either steam of the auxiliary boiler facility and the steam converter facility from one plant to the other plant. Characteristic nuclear power plant on-site steam supply facility.