JP2005321336A - Utility fluid supply system and method for nuclear installation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive utility fluid supply system for a nuclear installation capable of supplying a plurality of utility fluids. <P>SOLUTION: This utility fluid supply system for the nuclear installation for supplying the utility fluids in the nuclear installation is provided with utility fluid manufacturing devices 4, 5 for manufacturing the plurality of utility fluids different each other in temperatures, loaded heat-exchangers 8, 9 which are loading sites of the utility fluids manufactured in the utility fluid manufacturing devices 4, 5, utility fluid supply pipes for supplying the plurality of utility fluids manufactured in the utility fluid manufacturing devices 4, 5 to the loaded heat-exchangers 8, 9, and a valve switching means for supplying the plurality of utility fluids manufactured in the utility fluid manufacturing devices 4, 5 to the loaded heat-exchangers 8, 9, by switching valves. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nuclear facility utility fluid supply system and a nuclear facility utility fluid supply method, and more particularly to a system and method for supplying multiple types of utility fluids by switching valves.

Generally, a nuclear facility utility fluid supply system is composed of independent systems such as cold water, hot water, and steam. Each system is equipped with equipment and supplies each utility fluid using independent piping to the load destination (Patent Literature). 1 and 2).
JP 59-142368 A Japanese Patent Laid-Open No. 6-23596

  By the way, there is a cooling heating coil for ventilation air conditioning as a load destination of cold water and hot water. This cooling and heating coil supplies cold water or hot water according to the outside air temperature, but as described above, cold water and hot water are configured in separate systems, so the piping to the equipment and the load destination is There was a problem that the initial investment cost was high because they existed separately. Furthermore, while one utility fluid is being supplied, there is a problem that the facilities related to the other utility fluid are idle, and about half of the year becomes unnecessary facilities.

  Hereinafter, a conventional example of a nuclear facility utility fluid supply system will be described with reference to FIG.

  FIG. 5 is a schematic diagram of a conventional system system. The chilled water pump 3, the refrigerator 17, the chilled water headers 7-1, 7-2, and the auxiliary machine cooling water 14 of the exhaust heat source constitute a chilled water supply system, and the chilled water is supplied to the cooling heating coil 9 or the cooling coil 8. . Further, the heat exchangers 15-2 and 15-3, the hot water pump 2, and the auxiliary cooling water 14 or the steam 18 of the heat absorption source constitute a hot water production system, and the cold / hot water supply switching valves 10-18 to 10- The hot water is supplied to the cooling and heating coil 8 by the operation 25.

  The conventional nuclear facility utility fluid supply system described above is an independent system for each supply utility fluid, and in particular, a plurality of load destinations for supplying cold water and hot water such as the cooling heating coil 8 are switched. Equipment and piping are required. For this reason, the problem was that the initial investment cost was high.

  Patent Document 1 discloses a technique for producing cold / hot water by changing a refrigerant flow path by switching a valve inside the cold / hot water apparatus, but it is not a system capable of performing cooling and heating at the same time. Further, Patent Document 2 discloses a system configured with a heat pump refrigerator that supports a periodic inspection with a small load. In such a system, a backup steam heat exchanger is required depending on the selection of the heat pump refrigerator.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a nuclear facility utility fluid supply system and method for supplying a plurality of utility fluids at low cost.

  In order to achieve the above object, the present invention provides a utility fluid manufacturing apparatus for manufacturing a plurality of utility fluids having different temperatures in a nuclear facility utility fluid supply system for supplying a utility fluid used in a nuclear facility, and the utility A load destination heat exchanger that is a load destination of the utility fluid manufactured by the fluid manufacturing apparatus, and a utility fluid supply pipe for supplying a plurality of utility fluids manufactured by the utility fluid manufacturing apparatus to the load destination heat exchanger And a valve switching means for supplying a plurality of utility fluids manufactured by the utility fluid manufacturing apparatus to the load heat exchanger by switching valves.

  In addition, the present invention provides a utility fluid manufacturing method for manufacturing a plurality of utility fluids having different temperatures in a nuclear facility utility fluid supply method for supplying a utility fluid used in a nuclear facility, and the utility fluid manufacturing apparatus. A utility fluid transporting process for transporting the utility fluid to the load heat exchanger, and valve switching for supplying a plurality of utility fluids manufactured by the utility fluid manufacturing apparatus to the load heat exchanger by switching the valves. And a process.

  According to the present invention, a plurality of utility fluids selected from a load balance of a plurality of utility fluids can be manufactured by a single device, and a plurality of utility fluids can be supplied by common piping. For this reason, initial cost can be reduced and idle facilities can be reduced as compared with the conventional system.

  Hereinafter, embodiments of a nuclear facility utility fluid supply system and a nuclear facility utility fluid supply method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a system schematic diagram of an embodiment of a nuclear facility utility fluid supply system according to the present invention. In FIG. 1, the first cold / hot water header 6-1 branches into n pipes, and cooling heating coils (load-end heat exchangers) 8-1, 8-2,..., 8-n are connected. These are connected and joined to the 2nd cold / hot water header 6-2. The second cold / hot water header 6-2 is branched into p pipes, each of which is connected to a cold / hot water pump 1-1, 1-2,... 1-p and a single-type cold / hot water generator (utility fluid production apparatus) ), 4-1, 4-2,..., 4-p, and returned to the first cold / hot water header 6-1. The single-type cold / hot water generators 4-1, 4-2,..., 4-p exchange heat with the auxiliary cooling water 14.

  Further, the first cold water header 7-1 branches to m pipes, and cooling coils (load destination heat exchangers) 9-1, 9-2,... 9-m are connected. 2 connected to the cold water header 7-2. Branched into q pipes from the second cold water header 7-2, each of which is a cold water pump 3-1, 3-2, ... 3-q and a double bundle type cold / hot water generator (utility fluid production apparatus) It is comprised so that it may return to the 1st cold water header 7-1 through 5-1, 5-2, ... 5-q. The double bundle type cold / hot water generators 5-1, 5-2,..., 5-q exchange heat with the auxiliary cooling water 14.

  The pipe is further branched from the second cold / hot water header 6-2 via the valve 10-2, and a double bundle type cold / hot water generator 5- is provided by the hot water pumps 2-1, 2-2,. Hot water is supplied to 1, 5-2,..., 5-q. The hot water discharged from the double bundle type cold / hot water generators 5-1, 5-2,..., 5-q returns to the first cold / hot water header 6-1 through the valve 10-2.

  The single type cold / hot water generators 4-1, 4-2... 4-p and the double bundle type cold / hot water generators 5-1, 5-2,.

  Hot water produced by the single-type cold / hot water generators 4-1, 4-2,..., 4-n when supplying hot water to the cooling heating coils 8-1, 8-2,. If the load of the cooling and heating coils 8-1, 8-2,..., 8-n cannot be satisfied, the double bundle cold / hot water generator 5-1, 5-2,. The manufactured hot water can be supplied to the cold / hot water header 6-1 with the valve 10-1 open, and the load shortage of the cooling / heating coils 8-1, 8-2,.

  FIG. 2 is a flowchart showing details of the single type cold / hot water generator 4-1 shown in FIG. 1, and shows a hot water supply state. The other single-type cold / hot water generators 4-2,..., 4-p are the same as the single-type cold / hot water generator 4-1, and will not be described. In FIG. 2, hot water having a low temperature drawn from the cold / hot water header 6-2 is fed by the cold / hot water pump 1-1, and single-type cold / hot water is generated with the valve 10-3 opened and the valve 10-7 closed. Hot water with a high temperature is manufactured in the vessel body 4-1a. The high temperature hot water is supplied to the cold / hot water header 6-1 with the valve 10-4 open and the valve 10-8 closed.

  Heat source water having a high temperature for hot water production is supplied from the auxiliary cooling water system 14, and hot water is produced by the single-type cold / hot water generator main body 4-1a with the valve 10-5 opened and the valve 10-9 closed. For this reason, the heat is taken away and becomes a heat source water having a low temperature. The low temperature heat source water is returned to the auxiliary coolant system 14 with the valve 10-6 open and the valve 10-10 closed.

  When the temperature supplied from the auxiliary cooling water system 14 is high, the heat source water supply temperature control signal 13-1 from the heat reduction water supply temperature monitoring device 12-1 is input to the valve 10-11 to adjust the opening degree. Then, the heat source water having a low temperature supplied from the pipe 11-2 is mixed with the heat source water having a high temperature, so that the output from the heat source water supply temperature monitoring device 12-1 becomes a heat source water supply temperature target value. Control water supply temperature.

  In other words, when the same auxiliary cooling water is used for the intake and exhaust heat destinations, if the cooling water and the heat source water have the same temperature, the temperature of the hot water during heating is determined, so the required hot water temperature may not be obtained. The desired stable hot water outlet temperature can be obtained by adjusting the water temperature (auxiliary cooling water).

  FIG. 3 is a flowchart showing details of the double bundle type cold / hot water generator 5-1 shown in FIG. 1, and shows a simultaneous supply state of cold water and hot water. Since the double bundle cold / hot water generator 5-2,..., 5-q is the same as the double bundle cold / hot water generator 5-1, the description thereof is omitted. In FIG. 3, the cold water having a high temperature sucked from the cold water header 7-2 is fed by the cold water pump 3-1, and the cold water having a low temperature is produced by the double bundle cold / hot water generator body 5-1a. The low temperature cold water is supplied to the cold water header 7-1. At this time, the waste heat source when cold water is taken out by the double bundle cold / hot water generator is used for hot water production. The low temperature hot water sucked from the cold / hot water header 6-2 is sent by the hot water pump 2-1 with the valve 10-2 opened, and the hot water having a high temperature is produced by the double bundle type cold / hot water generator 5-1. . The hot water having the high temperature is supplied to the cold / hot water header 6-1 with the valve 10-1 being opened.

  When the load balance between the cold water and the hot water produced by the double bundle type cold / hot water generator main body 5-1a is lost, the cold water return temperature control signal 13-2 from the cold water return temperature monitoring device 12-2 is sent to the valve 10−. 12 to adjust the opening, supply the heat source water having a high temperature supplied from the pipe 11-3 to the cold water temperature adjusting heat exchanger 15-1, and exchange heat with the cold water having a low temperature. The cold water return temperature is controlled so that the output from the cold water return temperature monitoring device 12-2 becomes the cold water return temperature target value.

  As a result, when the cooling load is small in the utility manufacturing apparatus (double bundle type cold / hot water generator), the hot water outlet temperature is lowered, so that heat exchange with the auxiliary cooling water having a temperature higher than the cold water return temperature is performed as the cooling load. Stable hot water can be taken out.

  As a modification, a direct mixer (not shown) may be provided instead of the cold water temperature adjusting heat exchanger 15-1.

  FIG. 4 shows the details of the cooling and heating coil 8-1 shown in FIG. 1, and shows the hot water supply state. The cooling and heating coils 8-2,..., 8-n are the same as the cooling and heating coil 8-1, and the description thereof is omitted. In FIG. 4, hot water having a high temperature supplied from the cold / hot water header 6-1 is adjusted to a necessary heat exchange amount by the valve 10-13, and is cooled and heated in a state in which the valve 10-14 is open and the valve 10-16 is closed. It is supplied to the coil body 8-1a. The hot water having a high temperature exchanges heat with the heat exchange fluid 16 flowing in the same direction as the hot water having a high temperature to become a hot water having a low temperature, and the cold / hot water header 6-2 with the valve 10-15 opened and the valve 10-17 closed. Return to.

  In the nuclear facility utility fluid supply system configured as described above, the cooling heating coils 8-1, 8-2,... 8 -n and the cooling coils 9-1, 9-2,. The single type cold / hot water generators 4-1, 4-2,..., 4-p and the double bundle type cold / hot water generators 5-1, 5-2,. Producing cold and hot water. Therefore, a plurality of utility fluids can be manufactured with one device, and the utility fluid piping 11-1 supplied to the cooling heating coils 8, 8-2,..., 8-n can be used in common.

  Moreover, when the heat source water supply temperature at the time of hot water manufacture of the single type cold / hot water generators 4-1, 4-2, ... 4-p is high, the temperature monitoring device 12-1 and the temperature control signal 13-1 are used. By adjusting the valve 10-11 and mixing the heat source water having a low temperature with the heat source water having a high temperature from the pipe 11-2, the heat source water supply temperature is controlled, and the auxiliary machine cooling water 14 is used as an intake and exhaust heat destination. be able to.

  Furthermore, when the cold water load of the double bundle type cold / hot water generators 5-1, 5-2,..., 5-q is small, the valve 10-12 is set by the temperature monitoring device 12-2 and the temperature control signal 13-1. Adjusting and supplying the hot heat source water from the pipe 11-3 to the cold water temperature adjusting heat exchanger 15-1 and exchanging heat with the cold water having a low temperature, thereby controlling the return temperature of the cold water and hindering the production of hot water. I will not give you.

  In the embodiment described above, in the utility fluid manufacturing apparatus (double bundle type cold water hot water generator 5-1 or the like), the cooling water is used to condense the high-temperature and high-pressure refrigerant obtained by the compressor using the condenser. Instead, heat is exhausted to warm water. This hot water is used for heating. At this time, the utility fluid manufacturing apparatus has two condensers. One is for passing cooling water during cooling only, and the other is for passing warm water when cooling and heating are performed together.

  This device is particularly useful in nuclear power plants that require cooling throughout the year. Cold water and hot water can be taken out simultaneously. Moreover, by using together with the single type cold / hot water generator 4-1 etc. which become a heating exclusive machine in winter, the number of equipment of the whole cold-heat source equipment can also be reduced. In addition, it can also be used as a backup for a failure or inspection of the single type cold / hot water generator 4.

  Furthermore, the flow direction is constant when the cold water is sent to the heat exchanger through a common pipe, but if the cold water and hot water can flow countercurrently and in parallel with the airflow during cooling and heating In summer (countercurrent), the effect of lowering the air temperature after heat exchange can be expected, and in winter (parallel), antifreezing can be expected. The direction of air flow and cold / hot water flow can be determined by opening / closing the valve around the heat exchanger. That is, the valves 10-14 to 10-17 in FIG. 4 are in a valve opening / closing state during heating (cocurrent flow), and if they are opened and closed in the opposite direction, they are in a cooling (counterflow) state.

  In addition, since the auxiliary machine cooling water of the nuclear power plant is supplied at a stable temperature, it is possible to supply stable cold water or hot water by using the auxiliary machine cooling water as an intake and exhaust heat destination.

  In the above description, the auxiliary cooling water 14 is used as an intake / exhaust heat source for producing cold water and hot water. However, instead of the auxiliary cooling water 14 for nuclear facilities where the auxiliary cooling water 14 cannot be expected, It is also possible to use a cooling heat source tower that uses the atmosphere as an intake and exhaust heat source.

1 is a system schematic diagram of an embodiment of a nuclear facility utility fluid supply system according to the present invention. The flowchart which shows the detail of one of the single type cold / hot water generators of FIG. The flowchart which shows the detail of one of the double bundle type cold / hot water generators of FIG. FIG. 2 is a flowchart showing details of one of the cooling and heating coils of FIG. 1. The system schematic of the conventional nuclear facility utility fluid supply system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cold / hot water pump, 2 ... Hot water pump, 3 ... Cold water pump, 4-1 to 4-p ... Single type cold / hot water generator (utility fluid manufacturing apparatus), 4-1a ... Single type cold / hot water generator main body, 5 -1 to 5-q ... double bundle type cold / hot water generator (utility fluid manufacturing apparatus), 5-1a ... double bundle type cold / hot water generator body, 6-1 ... first cold / hot water header, 6-2 ... first 2 cold / hot water headers, 7-1 ... first cold water header, 7-2 ... second cold water headers, 8-1 to 8-n ... cooling heating coil (load heat exchanger), 8-1a ... cooling Heating coil main body, 9-1 to 9-m ... cooling coil (load heat exchanger), 10-1 to 10-2 ... valve, 11-1, 11-2 ... piping, 12-1, 12-2 ... Temperature monitoring device, 13-1 ... temperature control signal, 14 ... auxiliary machine cooling water, 15 ... heat exchange for cold water temperature adjustment Vessel, 16 ... the heat exchange fluid, 17 ... refrigerator, 18 ... steam

Claims (9)

In a nuclear facility utility fluid supply system for supplying a utility fluid used in a nuclear facility,
A utility fluid production apparatus for producing a plurality of utility fluids having different temperatures from each other;
A load heat exchanger that is a load destination of the utility fluid manufactured by the utility fluid manufacturing apparatus;
Utility fluid supply piping for supplying a plurality of utility fluids manufactured by the utility fluid manufacturing apparatus to the load-source heat exchanger;
A valve switching means for supplying a plurality of utility fluids manufactured by the utility fluid manufacturing apparatus to the load heat exchanger by switching valves;
A nuclear facility utility fluid supply system. The load heat exchanger includes a cold water load heat exchanger that supplies only cold water,
The utility fluid production device includes a cold fluid and hot water simultaneous extraction utility fluid production device that can extract cold water and hot water simultaneously,
When the amount of hot water supplied to the cold water load pre-heat exchanger is larger than the amount of cold water using the cold water hot water simultaneous extraction utility fluid manufacturing device for the cold water load pre-heat exchanger, the cold water / hot water simultaneous extraction Hot water supply piping for connecting hot water from a utility fluid manufacturing apparatus to the utility fluid piping;
A hot water transport device for transporting hot water from the cold fluid hot water simultaneous extraction utility fluid manufacturing device;
With
It is configured to be able to supplement the amount of heat of hot water by operating a valve when supplying hot water to the cold water load preheat exchanger,
The nuclear facility utility fluid supply system according to claim 1.   The load heat exchanger includes a cold / hot water heat exchanger for supplying cold water and hot water, and the cold / hot water heat exchanger is switched by switching a valve connected to the utility fluid supply pipe during cold water supply and hot water supply. The nuclear facility utility fluid supply system according to claim 1 or 2, wherein the system is configured to reverse the flow direction.   The nuclear facility utility fluid supply system according to any one of claims 1 to 3, wherein auxiliary facility cooling water of the nuclear facility is used as an intake and exhaust heat destination of the utility fluid manufacturing apparatus. Auxiliary machine coolant transport device for transporting the auxiliary machine coolant of the nuclear facility to the utility fluid manufacturing device,
A bypass pipe for bypassing at least a part of the auxiliary equipment cooling water of the nuclear facility to the inlet / outlet heat destination inlet of the utility fluid manufacturing device when the supply temperature of the auxiliary equipment cooling water of the nuclear facility is high;
An adjustment valve for adjusting the flow rate of the bypass pipe;
A monitoring controller for monitoring the intake / exhaust heat front inlet temperature of the utility fluid manufacturing apparatus and controlling the adjustment valve so that the intake / exhaust heat front inlet temperature falls within a predetermined range;
The nuclear facility utility fluid supply system according to claim 4, further comprising: When the cold water inlet temperature of the utility fluid manufacturing apparatus for simultaneous extraction of cold water and hot water is low, the temperature of the auxiliary equipment cooling water of the nuclear facility is adjusted by exchanging heat with the cold water at the inlet of the utility fluid manufacturing apparatus for simultaneous extraction of cold water and hot water. A cold water temperature control heat exchanger for
A heat exchanging pipe for supplying auxiliary cooling water for the nuclear facility to the cold water temperature adjusting heat exchanger;
An adjustment valve for adjusting the flow rate of the heat exchange pipe;
A monitoring control device that monitors the cold water inlet temperature of the utility fluid production device and controls the adjustment valve so that the cooling water inlet temperature is within a predetermined range;
The nuclear facility utility fluid supply system according to claim 4 or 5, further comprising:   When the cold water inlet temperature of the cold water hot water simultaneous extraction utility fluid manufacturing apparatus is low, the cold water hot water can be directly mixed with the cold water hot water simultaneous extraction with the cold water hot water inlet side cold water of the utility fluid manufacturing apparatus. 6. The nuclear facility utility fluid supply system according to claim 4 or 5, wherein the system is configured to increase an inlet side cold water temperature of the simultaneous extraction utility fluid production apparatus.   The nuclear facility utility fluid supply system according to claim 4 or 5, wherein the heat sink of the utility fluid manufacturing apparatus is a cooling and heating tower that exchanges heat with the atmosphere. In a nuclear facility utility fluid supply method for supplying a utility fluid for use in a nuclear facility,
A utility fluid manufacturing process for manufacturing a plurality of utility fluids having different temperatures from each other;
A utility fluid transporting process for transporting the utility fluid manufactured by the utility fluid manufacturing apparatus to the load heat exchanger;
A valve switching step for supplying a plurality of utility fluids manufactured by the utility fluid manufacturing apparatus to the load heat exchanger by switching valves;
A utility fluid supply method for a nuclear facility characterized by comprising:

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