KR20050062843A - System for electric-power production using cooling water of power plant - Google Patents

Abstract

In order to provide an electric power production system using the cooling water of the power plant that can generate electric power by using the cooling water discharged after condensing the turbine exhaust steam installed in the power plant or removing heat load from various equipment of the power plant, steam is heated by heating the water. Generating boilers; A turbine which receives steam, which is thermal energy generated by the boiler, and converts the steam into mechanical energy; A generator connected to the turbine and the shaft to convert mechanical energy converted from the turbine into electrical energy; A plurality of systems which take the heat of evaporation of the exhaust steam passing through the turbine to reduce steam to water or remove heat loads from various devices during operation of the power plant; A water intake line for supplying cooling water, such as sea water or river water, to the plurality of systems and a discharge line for discharging the heat load after removing the heat load so that the plurality of systems can serve as a heat exchanger. Including,

The discharge line provides a power production system using the cooling water of the power plant is installed with a secondary power generation equipment for producing electrical energy by using the kinetic energy of the cooling water discharged at a predetermined flow rate and flow rate.

Description

Power generation system using cooling water of power plant {SYSTEM FOR ELECTRIC-POWER PRODUCTION USING COOLING WATER OF POWER PLANT}

The present invention relates to an electric power production system using cooling water of a power plant, and more particularly, to generate electric power using cooling water discharged after condensing turbine exhaust steam installed in a power plant or removing heat load from various equipment of a power generation facility. It relates to a power production system using the cooling water of a power plant.

In general, a variety of energy is used as a method for producing power, as a representative example is a method using heat energy and a method using kinetic energy.

Thermal power generation method is to burn fossil fuels such as coal, oil, gas, etc., or to put nuclear fission material in the reactor, and gradually generate a chain reaction to obtain thermal energy, and then heat the water with this thermal energy to heat and steam It is a way to generate power by using the steam to turn the turbine directly connected to the generator.

The power generation method using kinetic energy is a method of using an artificial dam or natural force, a method of obtaining electricity by turning a water wheel, a windmill or a turbine by using the potential energy of the water, the difference between tides, wind power, ocean currents.

In addition, the combined power generation method is used to maximize the efficiency of the power generation method using heat energy. The combined power generation method combines the gas turbine and the steam turbine to convert the exhaust gas from the gas turbine into the boiler heat source of the steam turbine. The combined power generation method used and the combined heat and power generation method which uses the exhaust steam of a steam turbine as a heat source of a hot water storage tank, raises comprehensive energy utilization by combining power generation and district heating.

In the power generation system using the above-mentioned power generation system, the high temperature and high pressure steam generated from the boiler rotates the turbine while passing through the turbine, and rotates the generator by the rotation of the turbine to produce power. Steam that rotates the turbine is condensed through the condenser (復 水 器) is reduced to the water, and then consists of a structure that is circulated back to the boiler through the pump.

The condenser takes the role of a heat exchanger that takes the heat of vaporization of the steam flowing by the cooling water supplied to the condenser and reduces the steam to water. Sea water or river water is mainly used as the cooling water.

The cooling water is supplied by pumping sea water or river water through a water intake line to a condenser, or by installing a cooling tower that can store water, and supplying the necessary cooling water, which removes heat load from various equipment of the power plant. System is also provided to be supplied to various heat exchangers for.

The cooling water supplied to the condenser and various heat exchangers of the power plant is discharged to the sea or river after the predetermined purification process or as it is, as it is used, and the supply and discharge of the cooling water is continuously performed during operation of the power plant. Lose.

As a result, a thermal power plant or a nuclear power plant using thermal energy is constructed at a coastal area where it is easy to obtain a large amount of cooling water for operation.

However, since the cooling water used in the conventional power plant is discharged after being used only for heat exchange purposes, there is a problem in that the kinetic energy of the released cooling water is lost as it is.

That is, the power plant is installed at a position higher than the sea level, and the cooling water required for the operation of the power plant is pumped through a water inlet installed in the sea or the river and supplied to the power plant. Cooling water is discharged at a rate of approximately 4-5 m / s due to the height difference from the intake port.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to remove the heat load from the condenser and the various devices installed in the power plant by using the kinetic energy of the cooling water discharged at a predetermined speed to power It is to provide a power production system using the cooling water of a power plant that can produce.

In order to realize the object of the present invention as described above, a boiler for heating the water to heat the water to generate steam;

A turbine which receives steam, which is thermal energy generated by the boiler, and converts the steam into mechanical energy;

A generator connected to the turbine and the shaft to convert mechanical energy converted from the turbine into electrical energy;

A plurality of systems which take the heat of evaporation of the exhaust steam passing through the turbine to reduce steam to water or remove heat loads from various devices during operation of the power plant;

A circulating water system comprising a water intake line for supplying cooling water such as sea water or river water to the plurality of systems, and a discharge line for discharging the heat load after the supplied cooling water is removed from the sea or river so that the plurality of systems can serve as heat exchangers. Including,

The discharge line provides a power production system using the cooling water of the power plant is installed with a secondary power generation equipment for producing electrical energy by using the kinetic energy of the cooling water discharged at a predetermined flow rate and flow rate.

The auxiliary power generation facility is composed of a current generator to rotate the turbine by the flow rate and flow rate of the cooling water discharged to the discharge line, and to turn the generator by the power to obtain power.

A branch line is connected to one side of the discharge line, and the branch line is formed in a venturi form in which a predetermined section is narrowed to increase the kinetic energy by increasing the flow velocity of the discharged cooling water. Auxiliary power generation equipment is installed in the line so that the effective power generation of the generator can be increased

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

1 is a configuration diagram of a power plant for explaining an electric power production system using cooling water of a power plant according to a first embodiment of the present invention. The structure of a general power plant using thermal energy includes a boiler 10 for generating steam and The turbine 20 receives steam, which is thermal energy generated by the boiler 10, and converts the mechanical energy into mechanical energy, and the mechanical energy converted from the turbine 20 by shafts connected to the turbine 20 is converted into electrical energy. Takes the role of a heat exchanger for converting the generator 30 and the evaporation heat of the steam passed through the turbine 20 to reduce the steam to water or to remove the heat load from various equipment during operation of the power plant. It consists of a plurality of systems and a circulating water system for supplying cooling water to the plurality of systems so that the plurality of systems can perform its role.

Between the boiler 10 and the turbine 20 is connected to the supply line (L1) to supply the steam generated in the boiler 10 to the turbine 20 side.

The plural system is composed of a plurality of main units 40, unshown plural pumps, plural discharge pumps, gland steam condensers, drain coolers, low pressure water heaters and associated piping, valves, control and measuring equipment.

The condenser 40 is a kind of condenser that cools, condenses, and discharges the steam discharged from the turbine 20 to water to lower the pressure below atmospheric pressure, and the reduced water is returned to the boiler 10 through the recovery pipe line L2. Configured to supply.

The condenser 40 is a sealed container in which the main body can maintain a high vacuum, and a plurality of tubes constituting the heat transfer surface are installed therein, and the cooling water flows into these tubes to allow steam to flow out of the tubes. Heat exchanged with the cooling water inside the tube to cool and condense the steam is configured to reduce to water.

The circulating water system is a system for supplying cooling water to a condenser 40 for condensing exhaust steam passing through the turbine 20 and various heat exchangers 50 for removing heat loads from various devices of a power plant. Is pumped through the intake port 60 to the pump (P) is configured to supply to the heat exchanger 50 of the condenser 40 and the power generation equipment through the intake line (L3).

Thus, the heat load is removed from the exhaust steam of the turbine 20 or various devices of the power plant through the coolant supplied to the condenser 40 and the heat exchanger 50. The used coolant is discharged to the discharge line L4 without recovery. By the discharge port 70 is discharged to the sea or river.

Accordingly, when the power plant is operated, a large amount of coolant is continuously supplied and discharged, and the coolant flowing through the discharge line L4 is caused by the height difference between the heat exchanger 50 and the intake port 60 of the condenser 40 and the power generation facility. It is discharged at a flow rate of approximately 4-5 m / s.

The intake line (L3) and the discharge line (L4) may be formed in a conventional waterway type having a predetermined cross section or a closed pipe type.

The multi-system and circulating water system as described above is the same or similar structure as the system generally used in thermal power plants, nuclear power plants or cogeneration plants, the characteristics of the present invention is used in the condenser 40 and the heat exchanger (50) It is configured to generate power by using the kinetic energy of the cooling water discharged.

For this purpose, the auxiliary power generation unit 80 is installed in the discharge line L4 to produce electrical energy using the kinetic energy of the cooling water discharged with a predetermined flow rate and flow rate along the discharge line L4.

The auxiliary power plant 80 may be used by the current generator to rotate the turbine in accordance with the flow rate and the flow rate of the cooling water discharged to obtain a power by turning the generator by its power.

Such a generator may be applied to those commonly used, so detailed description thereof will be omitted. The advantages of current generation are costly for the production and installation of generators, but the cost of power generation is 68% of nuclear power and 40% of thermal power.

In order to produce electric power using the power production system using the cooling water of the power plant according to the present invention, when heat is first applied to the boiler 10 in the state of water input, the water inside the boiler 10 is heated while steaming Is changed to and supplied to the turbine 20 along the supply line (L1).

Accordingly, the turbine 20 converts steam force, which is thermal energy, into mechanical energy, and at this time, the generator 30 connected to the turbine 20 by shaft converts mechanical energy into electrical energy to produce electric power.

In addition, the heat energy of the steam is consumed in the energy conversion process, and the high-temperature exhaust steam passing through the turbine 20 is discharged to the condenser 40. During this action, various heat exchangers 50 constituting the condenser 40 and the power generation facility are provided. ) Is supplied with the cooling water through the intake line (L3) by pumping sea water or river water by the drive of the pump (P).

The exhaust steam discharged by the supply of the cooling water is condensed into water in the vapor state by losing the latent heat retained by the heat of the cooling water in the condenser 40, and then repeats the process of circulating to the boiler 10 through the recovery pipe line L2. The various heat exchangers 50 are removed from the heat load.

Cooling water that serves as a heat exchanger as described above is discharged to the sea or river through the discharge port 70 along the discharge line (L4) by the natural fall, wherein the cooling water flowing through the discharge line (L4) is approximately 4 ~ Since it flows at a flow rate of 5 m / s and has a predetermined kinetic energy, the turbine (not shown) is rotated by this kinetic energy to drive the auxiliary generator 80 with its power to produce electric power.

Since the supply and discharge of the cooling water is continuously performed during operation of the power plant, the auxiliary power plant 80 can be continuously operated to produce electric power during the operation of the power plant.

In the above embodiment, one generator is installed in the discharge line L4 through which the coolant is discharged, but the present invention is not limited thereto, and a plurality of generators may be installed to produce more power.

2 is the same as the first embodiment of the present invention except for the following matters as a second embodiment of the present invention.

That is, in the first embodiment of the present invention, the auxiliary power generation equipment 80 is installed on the emission line L4 to produce power, but in the second embodiment of the present invention, any of the emission lines L4 is optional. The branch line (L5) is connected to the discharge line (L4) and connected to each other in the section, the branch line (L5) is provided with auxiliary power generation equipment (80a, 80b).

The branch line (L5) may be in the form of an open waterway in the upper portion or may be in the form of a closed pipe, the gate (90a, 90b) is provided at both ends thereof.

The gates 90a and 90b are configured to be opened and closed, respectively, so as to open or close any one of the discharge line L4 or the branch line L5.

In addition, the auxiliary power plant (80a, 80b) is installed in the portion is formed in the form of the venturi 100 narrowed flow path to increase the kinetic energy by increasing the flow rate of the cooling water discharged to increase the effective power generation of the generator have.

One or two or more venturis 100 may be formed in such a branch line L5, and one or two or more auxiliary power plants 80a and 80b installed in the branch line L5 may be installed. Can be.

Since the gates 90a and 90b may selectively open and close the discharge line L4 or the branch line L5, the gates 90a and 90b may be discharged by operating the gates 90a and 90b to produce electric power using the discharged cooling water. When the line L4 is closed and the branch line L5 is opened, the coolant flows along the branch line L5 to drive the auxiliary power generators 80a and 80b to obtain power.

To stop the operation of the auxiliary power plants 80a and 80b, or to perform maintenance and repair, operate the gates 90a and 90b to close the branch line L5 and open the discharge line L4 to discharge the coolant. Emission through line L4 and flowing to branch line L5 is blocked.

Accordingly, maintenance and repair of the auxiliary power plants 80a and 80b installed in the branch line L5 can be facilitated.

As described above, the power generation system using the cooling water of the power plant according to the present invention can generate power by using the cooling water discharged at a predetermined speed after removing heat load from the condenser and various devices installed in the power plant. It can be maximized.

In addition, the present invention can increase the power production in the same power plant capacity, providing an expansion effect of the power generation capacity, and can improve the energy efficiency by about 1 to 2%, so that the use of fossil fuel can be reduced by that much environmental pollution Can be reduced.

1 is a configuration diagram of a power plant for explaining a power production system using the cooling water of the power plant according to the first embodiment of the present invention.

Figure 2 is an enlarged view of the discharge line and branch line for explaining the power production system using the cooling water of the power plant according to a second embodiment of the present invention.

Claims (5)

A boiler for heating water to generate steam; A turbine which receives steam, which is thermal energy generated by the boiler, and converts the steam into mechanical energy; A generator connected to the turbine and the shaft to convert mechanical energy converted from the turbine into electrical energy; A plurality of systems which take the heat of evaporation of the exhaust steam passing through the turbine to reduce steam to water or remove heat loads from various devices during operation of the power plant; A water intake line for supplying cooling water, such as sea water or river water, to the plurality of systems and a discharge line for discharging the heat load after removing the heat load so that the plurality of systems can serve as a heat exchanger. Including, The power generation system using the cooling water of the power plant in the discharge line is installed with a secondary power generation equipment for producing electrical energy by using the kinetic energy of the cooling water discharged at a predetermined flow rate and flow rate. The electric power production system according to claim 1, wherein the auxiliary power generation system comprises a current generator comprising a current generator which rotates a turbine according to the flow rate and flow rate of the cooling water discharged to the discharge line, and turns the generator into power. The method of claim 1, wherein a branching line is connected to one side of the discharge line, and the branching line is formed in a venturi shape in which a predetermined section is narrowed so as to increase the kinetic energy by increasing the flow velocity of the discharged cooling water. A power generation system using cooling water from a power plant constructed with auxiliary power plants installed at the Venturi Line to increase the effective power generation of a generator. The power generation system according to claim 1 or 3, wherein the auxiliary power generation facility uses cooling water of a power plant having one or two or more installed on a discharge line or a branch line. 4. The power plant of claim 3, wherein gates for opening or closing any one of the discharge line or the branch line are installed at both ends of the branch line to stop the operation of the auxiliary power plant or to facilitate maintenance and repair. Power production system using cooling water.