JPH05118503A - Steam feeding equipment - Google Patents

Abstract

PURPOSE:To provide steam feeding equipment which reduces the operation cost of an in-house boiler and is rational and economical. CONSTITUTION:Steam feeding equipment has a boiler l to feed steam to a steam using load 3 is provided. Further, a steam generating device 13 to generate steam by using high enthalpy fluid serving as a heat source is further provided. The boiler 1 and the steam generating device 13 are switcheably connected to the steam using load 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam supply facility,
Particularly, it relates to a steam supply facility for supplying steam to a steam use load installed in a nuclear power plant.

[0002]

2. Description of the Related Art A variety of steam use loads are installed in a nuclear power plant, and each steam use load is supplied with steam from a boiler of a steam supply facility.
FIG. 3 is a system diagram showing a conventional steam supply facility that supplies steam to the in-house steam use load of a nuclear power plant.

In order to supply steam to the in-house steam use load using the steam supply equipment of FIG. 3, first, steam is generated in the in-house boiler 1, and this steam is supplied through the steam supply pipe 2 to each steam use load 3 Supply to. Next, the return steam from the steam use load 3 is guided to the condensate recovery device 5 via the condensate recovery pipe 4. Next, the condensate water recovered by the condensate water recovery device 5 is transferred to the boiler water supply tank 7 via the condensate transfer pipe 6. Condensed water in the boiler water supply tank 7 is sent to the on-site boiler 1 via the boiler water supply pump 8 and the boiler water supply pipe 9 and is reused as boiler water supply again.

[0004]

The conventional boiler 1 of the steam supply facility uses heavy oil or electricity as a fuel or a heat source, but the amount of heavy oil or electricity used becomes a considerable amount throughout the year. This is a cause of increasing the amount of energy used.

The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a reasonable and efficient steam supply facility by reducing the energy consumption of the in-house boiler.

[0006]

In order to achieve the above-mentioned object, the steam supply equipment of the present invention is, as described in claim 1, a steam supply equipment equipped with a boiler for supplying steam to a steam use load. A steam generator for generating steam using an enthalpy fluid as a heat source is further provided, and the boiler and the steam generator are switchably connected to the steam use load.

[0007]

[Function] By connecting the boiler and the steam generator to the steam load so that they can be switched, when the power plant is in operation, steam is generated by the steam generator using turbine steam, etc., and this steam is used. Therefore, it is possible to supply the steam at a lower cost as compared with the conventional case where only the steam generated in the on-site boiler is supplied to each steam use load.

[0008]

Embodiments of the steam supply equipment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a system diagram showing an example of the steam supply equipment of the present embodiment. The steam supply facility of the present embodiment includes a boiler 1 that supplies steam to a steam use load 3. The boiler 1 is adapted to generate steam with heavy oil or electricity.

The steam supply equipment of this embodiment further comprises a steam generator 13 for generating steam using a high enthalpy fluid as a heat source, and the boiler 1 and the steam generator 1 are provided.
3 is switchably connected to the steam load 3.

The steam generator 13 generates steam with the high-temperature heated water sent from the heat exchanger 12, and the steam is supplied to the pipe 2
2 and the steam supply pipe 2 to the steam use load 3.

The heat exchanger 12 converts low temperature water into high temperature pressurized water by heat exchange with the high enthalpy fluid flowing through the high enthalpy fluid pipe 18, and the high temperature pressurized water is used as the steam generator 1.
It is configured to be sent to.

In the heat exchanger 12, if the high enthalpy fluid may be mixed in the pipe 10, the pressure on the pipe 10 side of the heat exchanger 12 should be kept higher than the pressure on the high enthalpy fluid pipe 18 side. It is better to design

Here, the differential pressure detecting device 9 is provided between the high enthalpy fluid pipe 18 and the pipe 10, and the difference between the fluid pressure in the high enthalpy fluid pipe 18 and the fluid pressure in the pipe 10 is a predetermined value. It is preferable that the valve 20 provided in the high enthalpy fluid pipe 18 can be closed when the pressure falls within the range.

This arrangement serves to prevent the high enthalpy fluid from flowing into the pipe 10 from the high enthalpy fluid pipe 18 in the heat exchanger 12, especially when the high enthalpy fluid is a radioactive substance. It is preferable to have such a configuration. In connection with this, the radioactive substance detection device 2 for detecting the inflow of the radioactive substance into the pipe 10
8 should be provided. A circulation pump 11 is connected to the steam generator 13 so that the condensate separated from the high temperature pressurized water is circulated to the heat exchanger 12 again.

It is preferable to provide a plurality of circulation pumps 11 and use them as standby machines other than those for normal operation. In addition, the circulation pump 1
It is preferable that a pressure detection device 21 is provided downstream of 1, and the circulation pump 11 is operated so that the pressure in the pipe 10 is maintained at the required predetermined pressure of the heat exchanger 12.

The first steam generator 13, the heat exchanger 12 and the circulation pump 11 are connected to each other by a pipe 10 and are constructed so as to form a circulation loop as a whole. The steam use load 3 is connected to a condensate recovery device 5 via a condensate recovery pipe 4, and the condensate recovery device 5 is connected to a water supply tank 15 via a pipe 25. A water supply pump 14 is connected to the water supply tank 15, and water in the water supply tank 15 is injected into the upstream side of the circulation pump 11 of the pipe 10 as makeup water.

A water level detection device 17 is provided in the steam generator 13, and the water supply pump 14 is operated so as to operate the water supply pump 14 when the liquid level of the condensed water in the steam generator 13 falls below a predetermined level. It is electrically connected.

On the other hand, the boiler 1
The steam is supplied to the steam use load 3 through the steam supply pipe 2 and is supplied from the boiler water supply tank 7 by the boiler water supply pump 8. The boiler water supply tank 7 is connected to the condensate recovery device 5 via a condensate transfer pipe 6.

The pipe 22 and the steam supply pipe 2 are provided with valves 24 and 23, respectively. By closing one of these valves 24 and 23 and opening the other, the supply source of the steam to be sent to the steam use load 3 is determined. The steam generator 13 or the boiler 1 can be selected.

Similarly, in the pipe 25 and the condensate transfer pipe 6,
Valves 27 and 26 are provided respectively, and these valves 27 and 26 are
By closing one of 26 and opening the other, the destination of the condensate from the condensate recovery device 5 can be selected from the water supply tank 15 associated with the steam generator 13 or the boiler water supply tank 7 associated with the boiler 1. Is becoming

When the steam supply equipment of this embodiment is installed in a nuclear power plant and the power plant is in a normal operating state,
By using a high enthalpy fluid such as turbine steam or main steam, steam can be generated by the steam generator 13 and this steam can be supplied to the steam use load 3. When using the steam generator 13, the valves 24, 27 are left open, while the valves 23, 26 associated with the boiler 1 are
Keep it closed. Next, a high enthalpy fluid such as turbine steam or main steam is introduced to the heat exchanger 12 via the high enthalpy fluid pipe 18.

Next, the heat exchanger 12 heat-exchanges the low-temperature water sent from the circulation pump 11 through the pipe 10 with the high-enthalpy fluid, and then steams the water pressurized to a high temperature by the heat-exchange. It sends it to the generator 13. The high temperature pressurized water is decompressed by the decompression valve 16 and then sent to the steam generator 13. The steam generated by the steam generator 13 is supplied to the pipe 22.
Then, the steam use load 3 is entered through the steam supply pipe 2.

On the other hand, the condensate of the steam used in the steam use load 3 enters the condensate recovery device 5 via the condensate recovery pipe 4, and the condensate recovery device 5 connects the recovered condensate to the pipe 25. To the water tank 15. Thus, the steam generator 13
Can be used to send steam to the steam usage load 3.

When the power plant is stopped, high enthalpy fluid such as turbine steam or main steam cannot be used, but steam is generated in the boiler 1 and this steam is supplied to the steam use load 3. You can When using the boiler 1, the valves 23, 26 are kept open, while the valves 24, 27 associated with the steam generator 13 are kept closed. Next, steam is generated in the boiler 1 and the generated steam is sent to the steam use load 3 via the steam supply pipe 2.
Condensate discharged from the steam use load enters a condensate recovery device 5 via a condensate recovery pipe 4, and further enters a boiler water supply tank 7 via a condensate transfer pipe 6. The water in the boiler water supply tank 7 is sent to the boiler 1 by the boiler water supply pump 8 through the boiler water supply pipe 9. Thus, the boiler 1 can be used to send steam to the steam usage load 3.

As described above, when the power plant is in operation, it is possible to generate steam to the steam use load 3 by the steam generator 13 using turbine steam or the like, and the fuel cost of the boiler 1 can be saved. Therefore, compared to the conventional case where only the steam generated in the boiler 1 is supplied to each steam use load 3, the steam can be supplied at a lower cost. FIG. 2 shows a graph comparing the operating cost of the steam supply equipment of the present embodiment with the conventional one. From this figure, it can be seen that the operating cost of the entire steam supply facility has been improved.

Further, since the steam supply equipment of this embodiment is designed so as not to mix into the steam generator side even when a high enthalpy fluid containing a radioactive substance is used as a heat source, it is safe and reliable. Able to supply high steam supply equipment. The steam supply facility of the present embodiment is most preferably applied to a nuclear power plant, but is not limited to this and may be applied to other chemical plants.

Further, although the steam supply equipment of this embodiment has a structure in which the steam generator using the high enthalpy fluid and the boiler are used together, it is also possible to use only the steam generator using the high enthalpy fluid.

[0028]

As described above, the steam generating equipment of the present invention is a steam supplying equipment equipped with a boiler for supplying steam to a steam use load, and a steam generating device for generating steam using a high enthalpy fluid as a heat source. Further provided, by connecting the boiler and the steam generator switchably to the steam use load, when the power plant is operating, steam to the steam use load by the steam generator using turbine steam or the like. Since it is possible to generate steam and save boiler fuel costs, it is possible to supply steam more effectively than in the conventional case where only steam generated by the boiler is supplied to each steam use load. it can.

Since the steam generator and the boiler may be operated alternately, the steam generator and the boiler can be maintained and inspected without stopping the operation of the nuclear power plant. Furthermore, even if the steam generator breaks down while the power plant is operating, the boiler can be used, so that a highly reliable steam supply facility can be provided.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of steam supply equipment of the present invention.

FIG. 2 is a graph comparing the operating cost when using the steam supply equipment of the present invention with a conventional one.

FIG. 3 is a system diagram showing a conventional steam supply facility.

[Explanation of symbols]

 1 Boiler 2 Steam supply pipe 3 Steam use load 4 Condensate recovery pipe 5 Condensate recovery device 6 Condensate transfer pipe 7 Boiler water supply tank 8 Boiler water supply pump 9 Boiler water supply pipe 10 Loop pipe 11 Circulation pump 12 Heat exchanger 13 Steam generation Device 14 Water supply pump 15 Water tank 16 Pressure reducing valve 17 Liquid level detection device 18 High enthalpy fluid piping 19 Differential pressure detection device 20 Valve 21 Pressure detection device 22 Piping

Claims (1)

[Claims] 1. A steam supply facility including a boiler for supplying steam to a steam load, further comprising a steam generator for generating steam using a high enthalpy fluid as a heat source, and the boiler and the steam generator can be switched freely. A steam supply facility connected to the steam load.