JPH10103880A - Cooling water apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cooling water apparatus in which there is reduced the number of electric driving valves each of which requires periodic maintenance and inspection, etc. SOLUTION: The present cooling water apparatus 29 includes a condenser cooling system 27 for flowing cooling water into a cooling fine pipe 6 disposed in a condenser 4, and a seawater condenser cooling system 28 for guiding a fresh cooling water into a seawater condenser 20 branched from the condenser cooling system 27 and provided for cooling fresh cooling water from a power plant system branched from the condenser cooling system 27 and joining the cooling water to the condenser cooling system 27. In this case, the other ends of an air vent pipeings 30, 32 disposed on the seawater condenser cooling system 28 are connected with the condenser sir vent piping 13 disposed on the condenser cooling system 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water system having a condenser cooling system and a seawater cooling system.

[0002]

2. Description of the Related Art In a conventional power plant, steam worked by a turbine is returned to a condensate in a condenser, and is injected again into a boiler for reuse. Further, a cooling water device for supplying seawater as cooling water for cooling the condenser is installed.

[0003] This cooling water device is composed of a condenser cooling system that pumps seawater by a cooling pump and sends it to a condenser, and a seawater that branches off from the middle of the condenser cooling system and sends water to the seawater cooler. It consists of a cooling water system.

Hereinafter, a conventional example of the cooling water device 29 will be described with reference to FIG. In the condenser cooling system 27 constituting the cooling water device shown in FIG. 2, the seawater introduced to the water intake tank 1 is boosted in pressure by the cooling water pump 2 and is returned as cooling water through the condenser cooling water inlet pipe 3. It is introduced into the inlet water chamber 5 of the water dispenser 4. The condenser 4 circulates the steam that has been worked by the steam turbine 7 coaxially connected to the generator 8, through which the cooling water disposed in the condenser 4 and guided from the condenser inlet water chamber 5 flows. The cooling water is condensed by a large number of cooling thin tubes 6.

[0005] The cooling water flowing through the cooling narrow tube 6 is supplied from a condenser outlet water chamber 9 to a condenser outlet valve 10 and a condenser cooling water outlet pipe.
Water is discharged to a water discharge tank 12 via 11 and discharged to the open sea. next,
The seawater cooler cooling system 28 constituting the cooling water device 29 will be described.

In FIG. 2, a cooling water branch pipe 15 branching from the condenser cooling water inlet pipe 3 is provided. The cooling water guided to the cooling water branch pipe 15 is introduced from the booster pump 16 into the inlet water chamber 21 of the seawater cooler 20 via the switching valve 19. The seawater cooler 20 is installed to cool the freshwater cooling water of the power plant system. The cooling water introduced into the seawater cooler 20 flows through a plurality of cooling thin tubes 22 and exchanges heat, and is condensed from an outlet water chamber 23 through a switching valve 19 and a cooling water outlet tube 26. It is led to the condenser cooling water outlet pipe 11 of the condenser cooling system 27. The booster pump 16 is installed at a high position in order to prevent the motor from being flooded due to a cooling water leak accident from a pipe or the like.

[0007] Due to such a structure, air may accumulate in the upper part of the booster pump 16, and in order to extract the air and discharge it to the atmosphere, the upper end of the booster pump 16 has an end in the atmosphere. The opened pump air release pipe 17 is connected to the air release valve 18
Connected through.

Further, since the seawater cooler 20 and the condenser 4 are also arranged at a higher position than the cooling water branch pipe 15 and the condenser cooling water inlet pipe 3, air is accumulated inside and the flow of the cooling water is increased. May be prevented. For this purpose, air vent pipes 24 and 13 whose ends are opened to the atmosphere are provided with air vent valves 25 and 25 at the upper part of the outlet water chamber 23 and the condenser outlet water chamber 9 in order to release air to the atmosphere. Connected via 14.

[0009]

Since most of the above-mentioned conventional power plants are automatically operated, the condenser outlet water chamber air release valve, the booster pump air release valve, and the seawater cooler outlet water chamber air release valve have It is an electric drive valve.

The electric drive valve is designed to open and close at each step, such as opening when the system is vented and closing at the end of the venting. Therefore, the control circuit becomes complicated, and a control panel for the circuit and a relay for an electrically driven valve are required. In addition, regular maintenance and inspections were required to maintain the functions. The purpose of the present invention is
An object of the present invention is to provide a cooling water device that can reduce the number of electric drive valves that require periodic maintenance and inspection.

[0011]

According to the first aspect of the present invention, there is provided a condenser cooling system for circulating cooling water through a cooling narrow tube provided in a condenser.
A seawater cooler system that branches from this condenser cooling system and guides the cooling water into the seawater cooler that is installed to cool the freshwater cooling water of the power plant system and joins this cooling water to the condenser cooling system A cooling water device, characterized in that the other end of the air vent pipe provided in the seawater cooler cooling system is connected to the condenser air vent pipe provided in the condenser cooling system. I do.

Further, in the present invention according to claim 2, the air vent pipe of the seawater cooler cooling system according to claim 1 is
Provided is a cooling water device, which is connected to at least one of a booster pump for increasing pressure of cooling water flowing in a seawater cooler cooling system and a seawater cooler.

[0013] In the cooling water apparatus configured as described above, even if the seawater cooler outlet water chamber air vent electric drive valve is omitted, the condenser air vent pipe and the air vent pipe communicate with each other. At the same time as the system is evacuated, the air in the seawater cooler cooling system can be evacuated.

[0014]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. In FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the description of the configuration of the parts will be omitted. In FIG. 1, an air vent pipe 30 disposed above the seawater cooler outlet water chamber 23 is connected to a condenser air vent pipe 13 via a manual air vent valve 31.

A pump air vent pipe 32 disposed above the booster pump 16 is connected to a seawater cooler through a manual air vent valve 33.
It joins with the air vent pipe 30 of 20 and is connected to the condenser air vent pipe 13.

In the above configuration, the water filling of the cooling water device 29 and the air bleeding in the system of the embodiment of the present embodiment are performed simultaneously by the condenser cooling system 27 and the seawater cooler cooling system 28. That is,
The cooling water pump 2 is operated in a state where the condenser outlet valve 10 is squeezed and the air vent valve 14 of the condenser outlet water chamber 9 is opened. The seawater flows simultaneously to the condenser cooling system 27 and the seawater cooling cooling system 28, but flows into the seawater cooler cooling system 28 arranged on the front side of the condenser 4. Since the volume inside the seawater cooler cooling system is smaller than that of the condenser cooling system 27, the air inside the seawater cooler cooling system 28 is emptied of the air inside the seawater cooler cooling system 28 and the pump air vent before the condenser cooling system 27. Piping 32
Through the condenser air vent pipe 13 and the inside of the seawater cooler cooling system is filled with cooling water. After that, the cooling water is guided to the condenser cooling system 27, and the air in the condenser cooling water system is discharged from the condenser outlet water chamber air vent pipe 13,
Filled with cooling water. Then, the condenser outlet water chamber 9
Is detected by the water level detector 34 and the condenser outlet water chamber air vent valve 14 is closed to complete the water filling in the system.

Since the pressure in the upper part of the condenser outlet water chamber 9 during operation is lower than the pressure of the seawater cooler 20 and the booster pump 16, even if the air release manual valves 33 and 31 are always kept open, There is no danger that seawater whose temperature has risen in the condenser during normal operation will flow back to the seawater cooler or booster pump.

As described above, since the seawater cooler and the air vent valve of the booster pump do not need to be electrically driven valves, and there is no need to construct a complicated control circuit, it is possible to save labor for maintenance and inspection work. Further, since the presence or absence of the end of the air release can be confirmed by the water level of the condenser outlet water chamber, automatic operation can be easily performed.

In FIG. 1, since the air reservoir in the condenser cooling system is located in both the cooling water cooler and the booster pump, both air vent pipes are connected to the condenser outlet water chamber air vent pipe. Although it is connected, if there is only one air reservoir in the vertical arrangement of the equipment, even if only the seawater cooler or only the booster pump is connected to the air vent pipe of the condenser outlet chamber by the air vent pipe The same effects as those of the above-described embodiment of the present invention can be obtained.

As described above, the pressure of the condenser outlet water chamber during normal operation is lower than that of the seawater cooler or the booster pump.
In order to minimize the amount of water flowing out of the seawater cooler or booster pump to the condenser outlet water chamber, adjust the connection position of the condenser outlet water chamber air vent pipe to a pressure-balanced position. Can be made possible.

[0021]

In the cooling water device according to the present invention,
With the configuration as described above, the number of electric drive valves can be minimized, and there is no need to construct a complicated control circuit, so that the apparatus can have an automatic operation function.

[Brief description of the drawings]

FIG. 1 is a system diagram of a cooling water device according to an embodiment of the present invention.

FIG. 2 is a system diagram showing a conventional example of a cooling water device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intake tank 2 ... Cooling water pump 3 ... Condenser cooling water inlet pipe 4 ... Condenser 5 ... Condenser inlet water chamber 6 ... Cooling tubing 9 ... Condenser outlet water chamber 11 ... Condenser cooling water Outlet pipe 13… Condenser air vent pipe 14… Air vent valve 15… Cooling water branch pipe 16… Boost pump 20… Seawater cooler 16… Cooling water outlet pipe 27… Condenser cooling system 28… Seawater cooler cooling system 29… Cooling water device 30… Air vent pipe 31, 33… Air vent manual valve 32… Pump air vent pipe 34… Water level detector

Claims (2)

[Claims] 1. A condenser cooling system for circulating cooling water in a cooling thin tube provided in a condenser, and a condenser for branching off from the condenser cooling system and cooling fresh water cooling water in a power plant system. In a cooling water device having a seawater cooler cooling system that guides the cooling water into the seawater cooler to be installed in the condenser cooling system, the cooling water is supplied to an air vent pipe provided in the seawater cooler cooling system. A cooling water device comprising the other end connected to a condenser air vent pipe provided in a condenser cooling system. 2. An air vent pipe of the seawater cooler cooling system is connected to at least one of a booster pump for boosting cooling water flowing through the seawater cooler cooling system and the seawater cooler. The cooling water device according to claim 1.