JPS6223231B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for controlling the temperature of waste water in power generation equipment,
More specifically, it consists of a steam generator, a turbine generator, and a condenser, and the condenser is supplied with seawater taken from a shallow sea area to perform a condensing action, and then drained into the shallow sea area. The present invention relates to a method for controlling the temperature of waste water in equipment.

[Prior Art] In general, power generation equipment in thermal power plants or nuclear power plants has conventionally adopted a configuration generally as shown in FIG. 1. That is, it has a turbine generator 3 integrally formed with a turbine 1 and a generator 2, and a steam generator 4, a condenser 5, and a pump 6 are connected to the turbine generator 3, and a condensate A water supply and drainage system having a water intake 7 and a pump 8 provided in shallow water near the power plant is connected to the vessel 5. Therefore, the high-temperature, high-pressure steam obtained from the steam generator 4 is sent to the turbine generator 3 to do work, and then guided to the condenser 5.
In this condenser 5, the pump 8 exchanges heat with the seawater taken from the water intake 7 and condenses the water.
The steam is then refluxed to the steam generator 4 again. On the other hand, the seawater heated up after heat exchange in the condenser 5 is transferred to the water intake 7.
It is released into the sea in shallow waters far away from the sea.

[Problem that the invention seeks to solve]

In this way, in power plants, seawater is used as a cooling medium to condense the steam after work, and the seawater temperature is normally 5℃ to 25℃ due to the heat exchanger discharged from the condenser. The temperature of the wastewater is usually further raised to about 5℃ to 10℃, so discharging such hot water into seawater is inconvenient because it can have a major negative impact on the cultivation of seaweed and fish and shellfish, for example. It was hot.

[Means for solving problems]

This invention was made in view of the above-mentioned drawbacks of the conventional technology, and it detects the temperature difference between the temperature of the waste water discharged from the condenser and the seawater temperature near the shallow water intake, and this temperature difference can be considered as an environmental problem. In order to control the temperature so that it does not increase by more than 2 degrees Celsius, for example, seawater is taken from the deep sea, where the temperature is always sufficiently lower than the seawater temperature in the shallow sea, and this seawater is recycled. It is mixed into the water supply and drainage system of water appliances to adjust the temperature of the drainage water.

〔Example〕

Hereinafter, embodiments of the steam condensing device according to the present invention will be described in detail with reference to FIGS. 2 and 3.

The embodiment shown in FIG. 2 is used to adjust the drainage temperature by mixing seawater taken from shallow waters with seawater from deep waters on the upstream side of the condenser 5, and the embodiment shown in FIG. This is a case where seawater from the deep sea is mixed downstream and the temperature of the waste water is adjusted in the same way. In each of these figures, the same reference numerals as in the above-mentioned Fig. 1 indicate the same or corresponding parts. First, in the embodiment of Fig. 2, as a water supply system to the condenser 5, a water intake is installed in a conventional shallow sea area. An opening/closing control valve 9 is inserted into the first supply system a of a pump 8 having a pump 7, and a pump 11 having a water intake 10 and an opening/closing control valve 12 are located in the deep sea, which is always sufficiently lower in temperature than the shallow sea. In addition to connecting the second supply system b, temperature detectors 13 and 14 are arranged respectively on the discharge side of the condenser 5 and in the shallow water near the water intake 7, and Temperature difference detector 1 that detects temperature difference
5, and the opening/closing control valves 9, 12 are controlled to open and close by the detection force of the temperature difference detector 15, so that the temperature difference detected by the temperature detectors 13, 14 is as small as possible, for example at least ±2. It is designed to be maintained below ℃.

That is, specifically, the temperature sensor 13, in other words, the temperature on the drain side of the condenser 5 is the same as that of the temperature sensor 1.
4. In other words, when the temperature of the seawater in the shallow area near the water intake 7 rises, the temperature difference between the two is detected by the detector 15, and the opening degree of the opening/closing control valve 9 is reduced by the detection force, and the temperature of the seawater in the shallow area is reduced. By reducing the amount of water taken from the deep sea area and at the same time increasing the opening degree of the opening/closing control valve 12 to increase the amount of water taken from the deep sea where the temperature is lower, the temperature of the water supplied to the condenser 5 and, as a result, the relative condensate The temperature of the waste water from the vessel 5 is lowered, and when the temperature of the temperature sensor 13 falls below the temperature of the temperature sensor 14, it is operated in the opposite manner to the above, thereby reducing the temperature in the shallow water area where the waste water is discharged. It automatically controls temperature changes to minimize them.

Next, FIG. 3 shows another embodiment suitable for the case where the seawater temperature changes in a relatively large period, such as in summer and winter, and shows a first supply system a having a regulating valve 9a. A branch pipe b' of the second supply system b having a control valve 12a on the upstream side of the condenser 5, and an on-off control valve 16 on the downstream side thereof.
The branch pipes b'' of the second supply system b having The first temperature is set so that the flow rate of seawater flowing into the condenser 5, that is, the temperature on the intake side and the temperature on the discharge side are almost constant.
The amount of inflow from the branch pipe b' of the second supply system b to the supply system a is set. When the temperature on the drainage side measured by the temperature sensor 13 rises higher than the seawater temperature near the water intake measured by the temperature sensor 14, the opening degree of the opening/closing control valve 16 is controlled by the detected force of the temperature difference detector 15. , the seawater taken from the deep sea area, which is colder than the branch pipe b'' of the second supply system b, is mixed into the wastewater, and this mixing lowers the wastewater temperature, and the wastewater is also discharged into the shallow sea area. This automatically controls temperature changes to minimize them as much as possible.

〔Effect of the invention〕

As detailed above, according to the present invention, in a power generation facility that takes water from a shallow sea area, condenses it, and discharges this supplied water to a shallow sea area, a supply system from the deep sea area where the temperature is lower is added. Along with letting
A detector is installed to detect the temperature difference between the temperature on the condenser drainage side and the temperature near the shallow water intake, and the detection power of this temperature difference detector is used to control the opening/closing control valve installed in the supply system from the deep sea. By controlling the amount of lower-temperature water taken in from the deep sea area, the temperature of the wastewater discharged into the shallow sea area can be made to be as equal as possible to the seawater temperature near the shallow sea water intake. This has the advantage of automatically resolving the environmental problems associated with wastewater discharge, and in the summer, it is possible to increase condensate performance by supplying more low-temperature seawater to the condenser. This also has the advantage of secondarily improving the degree of vacuum within the condenser and increasing power generation efficiency.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing an overview of conventional power generation equipment.
FIGS. 2 and 3 are block diagrams showing the outline of different embodiments of the apparatus used in the wastewater temperature control method according to the present invention. a...First supply system, b...Second supply system, 3...Turbine generator, 4...Steam generator, 5...Condenser, 7...Shallow sea water intake, 8...Pump, 9...Opening/closing control valve , 10...Deep sea water intake, 11...Pump, 1
2, 16...Opening/closing control valve, 13...Drainage side temperature detector, 14...Shallow water intake part side temperature detector, 15...Temperature difference detector.

Claims (1)

[Claims] 1. Equipped with a steam generator, a turbine generator, and a condenser, the condenser is supplied with seawater taken from a shallow sea area to perform a condensing action, and the waste water from the condenser is discharged into the shallow sea area. In the power generation equipment, a second supply system that takes water from the deep sea area is connected to the first supply system that takes water from the shallow sea area and discharges water to the shallow sea area via a condenser, and the second supply system is provided with an on-off control valve, and is also provided with a temperature detector that detects the intake water temperature and the waste water temperature of the first supply system, and a temperature difference detector that compares the measured temperatures of each of the temperature detectors. Controlling the flow rate of seawater flowing into the first supply system from the second supply system by operating the opening/closing control valve in response to a signal from the difference detector, thereby controlling the temperature of the waste water from the first supply system. A method for controlling the temperature of wastewater in a power generation facility, characterized in that: