JPH1137666A - Chlorine generator of sea water cooling power plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct and operate a cooling system of a generator with hydrogen gas by providing a path for feeding a chlorine constituent produced in a chlorine generating device to a cooling water circulation system and a path for feeding hydrogen gas produced as a byproduct in the chlorine generating device to a cooling system of a main generator. SOLUTION: Sea water is sucked by a circulation water pump 11 so as to take water through an intake 32 and part of the sea water taken is branched at an upstream side of a condenser 12 and is supplied as raw water to a chlorine generating device 14 after pressure is boosted by a booster pump 13. Sodium hypochlorite produced by the chlorine generating device 14 is injected to an inlet side of the circulation pump 11 through a chlorine supply line 15 and miscellaneous bacteria are treated and residues produced at that time are discharged to an outlet 33. On the other hand, the chlorine generating device 14 generates hydrogen gas as a byproduct and the hydrogen gas is collected by a hydrogen gas separator 29 and is supplied to a generator 23 through a hydrogen gas supply line 24 so as to use it as a cooling medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorine generator for a seawater-cooled power plant in which seawater is used to cool a condenser or the like.

[0002]

2. Description of the Related Art In a power plant that uses seawater for cooling water, a circulating water pump that supplies cooling water to a condenser, adhesion of marine organisms such as shellfish to seawater sampling and supply routes such as a seawater intake pipe, There is invasion of various bacteria.

[0003] When these marine organisms and various bacteria enter, they are harmful to the cooling water. To remove them, the chlorine compound sodium hypochlorite (NaClO) is supplied to the seawater circulation system. Inject).

[0004] The sodium hypochlorite used here exhibits strong oxidizing properties by generating free oxygen, and has a strong biocidal activity for killing living organisms and a strong bactericidal activity for killing various germs. It can be said that.

There are various methods for producing sodium hypochlorite depending on the type of marine organisms to be treated, the manner of dealing, and the like, and a method for producing seawater or salt by electrolysis using a chlorine generator without a diaphragm is generally used. It is.

An example of the reaction formula in this case is as follows. In the course of this reaction, sodium hypochlorite is generated,
At the same time, hydrogen gas is generated.

[0007]

Embedded image

The arrangement of a chlorine generator in a conventional seawater cooling system is configured as shown in FIG. 2 as a system diagram.

First, seawater is taken in from a water inlet 32 by a circulating water pump 11, supplied as cooling water for a condenser 12, cools exhaust gas from a steam turbine (not shown), and is then discharged to a water outlet 23. This constitutes a cooling system of a so-called seawater-cooled power plant.

The extracted seawater leaves the circulating water pump 11 separately from the cooling system and is partially branched upstream of the condenser 12 and pressurized by a booster pump 13 to serve as raw water for a chlorine generator 14. Provided.

Seawater supplied as raw material water for the chlorine generator 14 performs the above-described reaction in the chlorine generator 14 to produce sodium hypochlorite, and the sodium hypochlorite is supplied to the chlorine supply line 15. The water is supplied to the inlet side of the circulating water pump 11 through the circulating water pump 11, and is supplied to the circulating water pump 11 and the condenser 12 for the attachment of marine organisms and the treatment of various germs during the circulation. The residue generated when sodium hypochlorite or the like is generated by the chlorine generator 14 is discharged to a water discharge port 33 through a drain pipe 34.

On the other hand, in a power plant, from the finding that hydrogen gas (H ₂ gas) is useful for cooling a rotating body,
There is a direction to adopt this as a cooling medium of the generator.

[0013] That is, hydrogen gas has a small windage, so that the efficiency of the generator can be increased by 1 to 2%. Since the heat transfer coefficient of hydrogen is superior to that of air, it can be designed smaller than an air-cooled generator. If gas is supplied and circulated, there is no oxygen in the generator at that part, so that insulation deterioration is small, and noise and seal oil deterioration are also mentioned as advantages.

However, because of these advantages, hydrogen gas which is one of the most effective cooling media for generators can be generated by installing a hydrogen generator in a plant or by using a commercially available cylinder. Generally, hydrogen gas is procured and supplied or circulated for use.

An example is an arrangement as shown in FIG.
The hydrogen gas that exits the hydrogen gas generator 22 and is used for cooling the generator 17 and is heated is cooled by the hydrogen gas cooler 16, circulated to the generator 17, and used for cooling the generator 17 again. Can be

The cooling water heated by the heat exchange with the hydrogen gas in the hydrogen gas cooler 16 is cooled in the cooling tower 18.
The air is cooled by the air by the ventilator 19 and the circulation pump 2
0, circulates through the circulation system 21 to the hydrogen gas cooler 16 and is used for cooling the hydrogen gas.

[0017]

In the above-mentioned conventional apparatus, a system of a chlorine generator and a system of a hydrogen generation system using a hydrogen gas generator are provided side by side. First, the system of the chlorine generator will be described. And, when sodium hypochlorite (NaClO) is produced by a chlorine generator, most of it produces electrolyzed seawater,
The electrolysis consumes a large amount of electric power, requires running costs (electric power consumption), equipment and repair costs for electric equipment, and the like, and is extremely expensive.

Further, since the amount of sodium hypochlorite injected into circulating water as cooling water for the condenser is diluted by a considerable factor, the absolute value of the amount of sodium hypochlorite used is small. is there. In addition, hydrogen gas produced as a by-product in the electrolysis process is released to the atmosphere.

On the other hand, regarding a hydrogen generation system system using a hydrogen gas generator, dilution is carried out so that the impurity concentration in the circulating cooling water does not exceed a certain level, or the circulating cooling water is completely removed periodically at intervals. This system must be discharged and replaced with new cooling water, and this method cannot be expected to be effective despite the increase in costs. Further, since hydrogen gas has a light specific gravity, it is necessary to take various measures to prevent leakage.

The present invention solves the above-mentioned various problems in the prior art, and provides a chlorine-generating apparatus for a seawater-cooled power generation plant that functions more efficiently and effectively and is excellent in cost. That is the task.

[0021]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a seawater-cooled power plant, a chlorine generator using seawater as a raw water is provided. Chlorine in a seawater-cooled power plant equipped with a route for supplying the chlorine component generated in the process to the cooling water circulation system and a route for supplying the by-product hydrogen gas generated by the chlorine generator to the cooling system of the main generator A generator is provided.

That is, in the chlorine generator, attention is paid not only to generation of a chlorine component such as sodium hypochlorite but also to generation of hydrogen gas as a by-product in the chlorine generator. By supplying hydrogen gas that is temporarily generated to the cooling system of the main generator and cooling the main generator, there is no need to install a new hydrogen generator separately from the chlorine generator, and It is not necessary to purchase a commercially available hydrogen cylinder separately, and it is possible to construct and operate a cooling system for a generator using hydrogen gas at low cost and rationally.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a system configuration diagram of a chlorine generator according to the present embodiment. Note that the same parts as those of the above-described conventional one are denoted by the same reference numerals in the drawings, and redundant description will be omitted as much as possible.

The seawater is sucked by the circulating water pump 11 and is taken in from the water inlet 32 and supplied as cooling water for the condenser 12 to cool the exhaust of the steam turbine 26 (the exhaust system is not shown). Water is discharged to the water discharge port 33.

The extracted seawater exits the circulating water pump 11, is partially branched upstream of the condenser 12, is boosted in pressure by a booster pump 13, and is supplied as raw water for a chlorine generator 14.

The sodium hypochlorite generated by the chlorine generator 14 is injected into the inlet of the circulating water pump 11 through the chlorine supply line 15 and used for the attachment of marine organisms such as shellfish and the treatment of various germs. . The residue generated when sodium hypochlorite or the like is generated in the chlorine generator 14 is discharged to a water discharge port 33 via a drain pipe 34.

On the other hand, the chlorine generator 14 generates hydrogen gas as a by-product at the same time as generating sodium hypochlorite. This hydrogen gas is collected by a hydrogen gas separator 29 and supplied to a generator 23 via a hydrogen gas supply line 24 to be used as a cooling medium therefor.

Since the temperature of the hydrogen gas used for cooling the generator 23 rises, the hydrogen gas is sent to a cooling tower 25 through a hydrogen gas circulation line 30 to be cooled, and the hydrogen gas is supplied to the generator 23 using the hydrogen gas supply line 24. For cooling the generator 23.

In the drawing, reference numeral 27 denotes a cooling water discharge line, which shows a system for discharging the cooling water accumulated in the cooling tower 25 by using a discharge pump 31, and reference numeral 28 denotes a hydrogen gas purge line.
This is provided to discharge excess hydrogen gas to the outside of the system when excessive hydrogen gas is generated for cooling the generator 23.

In the above-described conventional power plant,
Generally, an independent hydrogen gas generator and its supply system are provided for cooling the generator 23, or a device for cooling the generator 23 using a commercially available hydrogen gas cylinder is provided. In the embodiment, as described above, the hydrogen gas separator 29 is provided alongside the chlorine generator 14, and the hydrogen gas generated as a by-product in the chlorine generator 14 is used. There is no need to provide a device that uses a commercially available hydrogen gas cylinder,
The equipment cost for installing these devices and the running cost for operating these devices can be reduced, which is extremely beneficial.

Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various changes may be made to the specific structure within the scope of the present invention.

[0033]

As described above, according to the present invention, in a seawater-cooled power plant, a chlorine generator using seawater as a raw water is provided, and a chlorine component generated by the chlorine generator is supplied to a cooling water circulation system. Since a chlorine generator is constructed by providing a path and a path for supplying hydrogen gas generated as a by-product in the chlorine generator to the cooling system of the main generator, such a seawater-cooled power plant is constructed. Effective use of chlorine generators for the processing of marine life such as shellfish and other germs in the circulating water system that are originally required, without disposing hydrogen gas by-produced by the chlorine generator to the atmosphere Supply to the cooling system of the main generator for cooling it, thereby eliminating the need to provide a separate hydrogen gas generator or a device using a commercially available hydrogen gas cylinder. , Running cost The one in which it was possible to significant savings.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of a system of a chlorine generator according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an outline of a system of a conventional chlorine generator.

FIG. 3 is an explanatory diagram showing an outline of a system of a conventional hydrogen gas generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Circulating water pump 12 Condenser 13 Booster pump 14 Chlorine generator 15 Chlorine supply line 16 Hydrogen gas cooler 17 Generator 18 Cooling tower 19 Ventilator 20 Circulation pump 21 Circulation system 22 Hydrogen gas generator 23 Generator 24 Hydrogen gas Supply line 25 Cooling tower 26 Steam turbine 27 Cooling water discharge line 28 Hydrogen gas purge line 29 Hydrogen gas separator 30 Hydrogen gas circulation line 31 Discharge pump 32 Water intake 33 Water outlet 34 Drain pipe

Claims (1)

[Claims] In a seawater-cooled power plant, a chlorine generator using seawater as raw water is provided, and a chlorine component generated by the chlorine generator is supplied to a cooling water circulation system. A chlorine generator for a seawater-cooled power plant, wherein a path for supplying hydrogen gas generated as a by-product to the cooling system of the main generator is provided.