JP2002122006A - Power generation equipment utilizing low-temperature exhaust heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve power generation efficiency, to suppress rise in a sea water temperature and to reduce discharge amount of carbon dioxide by recovering energy lost in condensers by considering the problem, wherein condenser loss is large in a thermal power generation, nuclear power generation and geothermal power generation using the condensers, power generation efficiency is about 50% and 50% energy is disposed in even a latest thermal power plant, condenser loss energy is abandoned in the ocean in many power generation plants, rise in the sea water temperature is produced and fishery problems are raised, and carbon dioxide for causing global warming is discharged in the thermal power generation accompanying fossil fuel. SOLUTION: Energy lost in the condensers is recovered by a low-boiling point medium, and power generation is performed by the recovered energy. As the energy recovering method, either of the methods of directly conductly heat exchange of steam turbine exhaust with the low-boiling point medium or of performing a heat exchange of steam turbine exhaust with cooled cooling water drain and the low boiling point medium may be selected.

Description

DETAILED DESCRIPTION OF THE INVENTION

In a power generation facility using a condenser, high-temperature and high-pressure steam generated by a steam generator is passed through a steam turbine, electricity is generated by a generator directly connected to the steam turbine, and steam discharged from the steam turbine is condensed. The steam is cooled by cooling water and condensed. The condensate is cycled by raising the pressure with a pump and returning to the steam generator again. In the condenser, the amount of heat corresponding to the difference between the enthalpy of the saturated steam and the enthalpy of the saturated water is cooled by the cooling water, and the heat is released to the sea and the atmosphere. The present invention exchanges heat cooled by a condenser with a low-boiling-point medium, generates low-boiling-point medium vapor, and guides the low-boiling-point medium vapor to a turbine to generate power. Examples of the low boiling point medium include ammonia.

TECHNICAL FIELD OF THE INVENTION

The field of power generation using a steam turbine such as thermal power generation, nuclear power generation, geothermal power generation, etc.

[Prior art]

As shown in FIG. 1, in a power generation facility using a two-steam turbine, such as thermal power generation, nuclear power generation, and geothermal power generation, high-temperature steam generated by one steam generator is used. 1. Via steam piping 1. Lead to steam turbine In a steam turbine, heat energy of steam is converted into kinetic energy. 2. The six generators connected to the steam turbine convert kinetic energy transmitted from the two steam turbines into electric energy to generate power. (2) The exhaust steam of the steam turbine is cooled by the condenser (3) and becomes condensed water. (4) The pump returns to (1) the steam generator device again via (8) condensing pipe, (5) feed water heater, and (9) feed water pipe. The three condensers cool the low-pressure, low-temperature steam worked by the two steam turbines with 10 cooling water and return to the condensate. The 11 cooling water drain whose temperature has risen by cooling the steam with the condenser 3 is discharged to the sea, or heat is released to the atmosphere by a cooling tower or a cooling pond.

[Problems to be solved by the invention]

[0004] In the three condensers, the exhaust steam of the two steam turbine is cooled by 10 cooling water, and the latent heat of the steam is discarded without being utilized. The present invention recovers heat discarded by the three condensers to generate power.

[Means for Solving the Problems]

[0005] The exhaust of the two-steam turbine is at a low temperature but higher than the ambient temperature. The heat energy of the low-temperature two-steam turbine exhaust gas is exchanged with a low-boiling medium such as ammonia to recover heat, thereby generating low-boiling medium steam.
This is a method in which a low-boiling medium turbine is rotated to generate 23 electric power. (2) The method of heat exchange between the steam turbine exhaust and the low boiling point medium is a method using a heat exchanger of 25 turbine exhaust steam and a low boiling point medium, and (3) A method of exchanging heat with the cooling water drainage of the condenser and the low boiling point medium. You could think so.

【Example】

No example

The present invention can be applied to both existing power generation equipment and new power generation equipment. Thermal power generation, nuclear power generation, or geothermal power generation with the current three condensers have large heat loss in the three condensers, and even the latest power generation equipment uses only about 50% of the input energy as electric energy. Absent. That is, more than 50% of the energy is wasted. In the present invention, energy that is discarded in the sea or the atmosphere, which is close to 50%, is recovered and used for power generation, thereby achieving energy saving, suppression of carbon dioxide emission, and suppression of seawater temperature rise.

[Brief description of the drawings]

FIG. 1 is a system diagram showing flows of steam and water in a conventional power generation facility.

[Explanation of symbols]

 1. Steam generator 2. Steam turbine 3. Condenser 4. Pump 5. Feed water heater 6. Generator 7. Steam piping 8. Condensate piping 9. Water supply piping 10. Cooling water 11. Cooling water drainage

FIG. 2 is a system diagram showing an example in which direct heat exchange is performed between turbine exhaust steam and a low boiling point medium according to the present invention.

[Explanation of symbols]

 1. Steam generator 2. Steam turbine 4. Pump 5. Feed water heater 6. Generator 7. Steam piping 8. Condensate piping 9. Water supply piping 21. Low boiling medium turbine 22. Low boiling point medium cooler 23. Low-boiling medium turbine generator 24. Low boiling point medium pump 25. 26. Heat exchanger for turbine exhaust steam and low boiling point medium Low boiling medium piping 27. Low boiling point medium piping 28. Low boiling point medium piping

Claims (1)

[Claims] (1) Power generation equipment characterized in that exhaust steam of a steam turbine is directly or indirectly subjected to heat exchange with a low-boiling-point medium, and the turbine is rotated by the low-boiling-point medium to generate power. The heat exchange method between the exhaust gas and the low-boiling medium is either the direct heat exchange method between the steam turbine exhaust and the low-boiling medium or the heat exchange method between the cooling water drainage of the condenser installed at the steam turbine outlet and the low-boiling medium. It is within the scope of the claims.