JPH108918A - Water facility for electric power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently utilize blowdown water, by inserting a valve into a service water line, and also connecting a tie line, branched from a blowdown line, to the downstream side of the service line, in a water facility equipped with a cooling tower having the blowdown line, and a water treating facility having the service water line. SOLUTION: The cooling tower 1 of an electric power plant is equipped with a circulating water pump 2 and a circulating line returning via a steam condenser 3, and a cooling tower blowdown line 4 is provided via a butterfly valve 16 from the outlet of the circulating water pump 2. Also a service water line 7 is arranged via a service water pump 8 in a water treating facility 6; and in this case, a valve 17 is inserted into the service water line 7, and the outlet side of the valve 17 is connected, by a tie line 14 via a pressure compensated flew control valve 15, to the cooling tower blowndown line 4. At the time of using the cooling tower the valve 17 is closed and the pressure compensated flow control valve 15 is opened, and the cooling tower blowdown water is flowed into the service water line 7, to be used as the service water for an electric power plant facility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a power plant water facility applied to a power plant having a cooling tower.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional cooling tower and a miscellaneous water facility of a power plant. As shown in FIG. 1A, the cooling tower 1 is provided with a circulating line returning through a circulating water pump 2 and a condenser 3 in order. A cooling tower blowdown line 4 is provided, which branches off from the outlet of the circulation pump 2 and goes out of the plant via a butterfly valve 16.

As shown in FIG. 1B, there is a water treatment facility 6 to which raw water 5 is supplied. From there a general purpose water pump 8
, A utility water line 7 is arranged, a fuel pump room washing line 9 and a control building toilet line 1 are provided.
0, canteen toilet line 11, boiler floor cleaning line 1
2 and a branch to a fuel receiving area cleaning line 13.

[0004] In the above, in the system of the cooling tower 1, the circulating water cooled by the cooling tower 1 is boosted by the circulating water pump 2, and heat exchange is performed by the condenser 3 and the like, and then returns to the cooling tower. . On the other hand, in order to prevent the concentration of impurities in the circulating water, a part of the circulating water is constantly blown out of the system by the cooling tower blowdown line 4.

[0005] Each of the miscellaneous water in the plant is supplied from a water treatment facility 6 which receives raw water 5.

[0006]

In the above-mentioned conventional plant, cleaning water for buildings, floors, facilities, and toilets in the plant area is supplied from an on-site water treatment facility 6. In the plant water treatment equipment 6, treatments such as fining, filtration, and chemical treatment are performed. Therefore, if the consumption is large, the running cost of the water treatment equipment becomes large. Therefore, it is required in plant operation to reduce the water consumption of the above system as much as possible.

[0007] In addition, since the amount of raw water used is limited depending on the location of the plant, it is necessary to reduce the amount of raw water used in the entire plant as much as possible.

[0008]

The present invention employs the following means to solve the above-mentioned problems.

That is, in a power plant water facility having a cooling tower having a blowdown line for draining water to the outside of the power plant and a water treatment facility having a miscellaneous water line for supplying miscellaneous water to the facilities of the power plant, A valve is inserted into the municipal water line and branched off from the blowdown line and connected to the downstream side of the valve via a flow control valve.

In the above description, when the cooling tower is used, the valve is closed, the flow control valve is opened, and the cooling tower blowdown water flows into the general water line. Then, it is used as general water for power plant equipment.

The surplus cooling tower blowdown water is drained out of the plant as before. When the cooling tower is not used,
The valve and the flow control valve operate in the opposite manner, and the water is supplied from the water treatment facility as before. As described above, the blowdown water is effectively used, and the running cost and water consumption of the water treatment equipment can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. The parts described in the conventional example are assigned the same reference numerals, and the description thereof will be omitted. The parts related to the present invention will be mainly described.

The utility water line 7 on the outlet side of the utility water pump 8
Is inserted into the valve 17. In addition, the cooling tower blow-down line 4 on the outlet side of the butterfly valve 16 branches off and the flow control valve 1
5 is connected to the outlet side of the valve 17 by a tie line 14.

In the above, when the cooling tower 1 is used, the valve 17 is closed and the flow control valve 15 is opened, so that the cooling tower blowdown water flows into the general water line 7. Then, the cooling tower 1 is always operated, and the cooling tower blow-down water amount is generally larger than the usage water of the cooling tower. The flow rate is adjusted by the flow control valve 15 according to the required amount. Excess cooling tower blowdown water is drained out of the plant as before.

In the case of a plant in which the cooling tower blowdown water is insufficient due to the special characteristics of the plant, a valve (flow control valve) 17 is opened to match the shortage, and the shortage is supplied from the water treatment facility 6 side.

When the cooling tower is not used, the valve 17 and the flow control valve 15 operate in the opposite manner to the above, and the water treatment equipment
Water is supplied from.

As described above, the blowdown water is effectively used, and the running cost and water consumption of the water treatment equipment can be reduced.

[0018]

According to the present invention as described above,
During the operation of the cooling tower, the cooling tower blowdown water is used as part of the house water (washing water for buildings, floors, and toilets). Therefore, the raw water consumption of the entire plant can be reduced, and the running cost of the water treatment equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration system diagram of an embodiment of the present invention.

FIG. 2 is a configuration system diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Circulating water pump 3 Condenser 4 Cooling tower blowdown line 5 Raw water 6 Water treatment equipment 7 On-site miscellaneous water line 8 Miscellaneous water pump 9 Combustion pump room washing line 10 Control building toilet line 11 Cafeteria toilet line 12 Boiler floor Cleaning line 13 Fuel receiving area cleaning line 14 Tie line 15 Flow control valve 16 Butterfly valve 17 Valve (flow control valve)

Claims (1)

[Claims] 1. A power plant water facility comprising: a cooling tower having a blow-down line for draining water to the outside of the power plant; and a water treatment facility having a miscellaneous water line for supplying miscellaneous water to facilities of the power plant. A water plant for a power plant, wherein a valve is inserted into a miscellaneous water line, branched from the blowdown line, and connected to a downstream side of the valve via a flow control valve.