JP2005114240A - Cooling facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling facility capable of contracting the building site area of a power plant by reducing the cost of a cooling facility for cooling water. <P>SOLUTION: This cooling facility is adapted to pass a part of piping of the cooling water system of a thermal power generation facility in ground or in water such as river, lake or sea to use it as a cooling medium of cooling water. This part of piping has a heat exchange part for exchanging heat with the outside of the piping, and is arranged to pass the heat exchange part in the ground or in water. When a cooling tower for cooling water is provided in the cooling water system, the heat exchange part is provided on the upstream pipe from the cooling tower. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooling water cooling facility in a cooling water system of a thermal power generation facility.

  In general, the fluid of the cooling water system whose temperature has been raised by exchanging heat with the medium to be cooled is cooled by a cooling facility such as a cooling tower, then boosted by a circulation pump and transferred to the cooling water system again.

  In a thermal power plant or the like, there is a water supply (condensate) system that condenses steam that has finished work in a steam turbine by heat exchange in a heat exchanger called a condenser, and supplies the steam again to the boiler equipment. In a cooling water system that supplies the cooling water necessary for condensing steam into the condenser cooling pipe (tube nest), the cooling water whose temperature used for cooling the turbine exhaust steam in the condenser has increased. Is collected in a cooling facility and cooled until it reaches an appropriate temperature for transfer to the condenser again.

  In a large thermal power plant, seawater may be used for cooling water without installing cooling equipment such as a cooling tower. In this case, the seawater taken from the intake is transferred to the condenser cooling pipe (tube nest) through the transfer pipe, and is used to condense the steam by indirect heat exchange with the steam discharged from the steam turbine. Used. The cooling water whose temperature has been increased by the heat exchanger in the condenser is discharged out of the system (sea) from the discharge port via the delivery pipe.

As for the technology for cooling the cooling water of the condenser using a cooling tower, for example, Japanese Patent Laid-Open No. 2002-2002
No. 221395 is disclosed.

JP 2002-221395 A (FIG. 1)

  In a thermal power plant, if the temperature in the condenser rises, the power generation efficiency decreases. Therefore, in order to transfer the cooling water into the condenser, it needs to be cooled to an appropriate temperature. In a thermal power plant having a cooling tower facility, a cooling tower having sufficient cooling performance is required. In general, the cooling tower equipment performs air cooling, so that the performance is lowered in summer when the atmospheric temperature is high. Therefore, large-scale cooling tower facilities are required at construction sites where the atmospheric temperature is high in summer. As a result, the construction coast of the cooling tower facility and the construction site area are increased.

  In cold regions, cooling tower equipment is used only in the summer, and in the winter, some of the cooling towers may be stopped due to concerns about freezing of the cooling water. In this case, in the piping connected to the stopped cooling tower, there is a risk of cooling water freezing due to fluid stagnation, so it is necessary to take measures to prevent freezing of the cooling tower and the accompanying equipment and piping. In some cases.

  In thermal power plants that use seawater as cooling water, the fluid is seawater. Therefore, in order to prevent corrosion in the circulating water piping and to prevent shells from attaching to the circulating water piping, Although measures such as installing rubber lining in the water pipe are taken, it is necessary to periodically remove shellfish in the pipe. Moreover, the construction site of the power plant is limited to the coast where seawater can be taken and drained.

  The objective of this invention is providing the cooling equipment which can reduce the cost of the cooling equipment of cooling water, and can reduce the construction site area of a power plant.

  In order to achieve the above object, the present invention is configured such that a part of the piping of the cooling water system passes through the ground or water such as rivers, lakes, and oceans and is used as a cooling medium for the cooling water. It is characterized by.

  According to the present invention, cooling equipment such as a cooling tower can be reduced in size or not required, and the construction cost and the construction site area can be reduced.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 shows a cooling water system diagram according to the first embodiment of the present invention. The cooling water boosted by the circulation pump 1 is transferred through the circulating water pipe 2 and circulated in the system. The cooling water is transferred to the condenser 3 after leaving the circulation pump 1. Inside the condenser 3, steam that has finished work in a steam turbine (not shown) is cooled and condensed by indirect heat exchange with cooling water. The cooling water whose temperature has risen in the condenser 3 passes through the circulation pump 1 again and is cooled to an appropriate temperature to be transferred to the condenser 3, so that the cooling medium 4 (river, pond, The water is transferred to the circulation pump 1 again through a circulating water pipe 5 (heat exchange section) installed in a lake, ocean, soil, etc.).

  Thus, if there is a cooling medium 4 outside the system, construction is possible. The flow rate of the cooling water passing through the circulating water pipe 5 (heat exchange part) is adjusted by the flow rate control valve 6. As the structure of the circulating water pipe 5 (heat exchanging section), if the contact area with the cooling medium is increased on the outer surface of the pipe, the heat exchange amount increases and the cooling efficiency can be increased. As a configuration of the pipe for increasing the contact area with the cooling medium, a method of attaching a cooling fin to the outer surface of the pipe in the heat exchanging section or branching the pipe into a plurality of pipes can be considered.

  In addition, the amount of heat exchange can be increased by lowering the flow rate of the fluid in the pipe, and the cooling efficiency can be increased. As a configuration of the piping for reducing the flow velocity of the fluid in the pipe, a method of enlarging the pipe diameter in the heat exchange section or a method of branching the pipe into a plurality of pipes in the heat exchange section can be considered.

  In addition, it is possible to increase the amount of heat exchange and increase the cooling efficiency by using a material having high thermal conductivity as the tube material. The adjustment of the flow rate control valve 6 is controlled by the measured temperature value of the fluid in the circulating water pipe 5 in the thermometer 7 (condenser inlet) and the thermometer 8 (condenser outlet).

  FIG. 2 shows a second embodiment of the present invention, and the description of the same configuration as in FIG. 1 is omitted. In the present embodiment shown in FIG. 2, a cooling tower 9 is added to the cooling facility in the configuration of FIG. By taking this embodiment, the cooling water is cooled through the circulating water pipe 5 (heat exchange section) installed in the cooling medium 4 (river, pond, lake, ocean, soil, etc.) outside the system. Since it is transferred to the cooling tower 9, the load on the cooling tower can be reduced even in an installation place where the atmospheric temperature is high in summer, and the cooling tower can be downsized.

  As in the embodiment of FIG. 1, the flow rate of the cooling water passing through the circulating water pipe 5 (heat exchange part) is adjusted by the flow rate control valve 6. The adjustment of the flow rate control valve 6 is controlled by the measured temperature value of the fluid in the circulating water pipe 5 in the thermometer 7 (condenser inlet) and the thermometer 8 (condenser outlet). That is, when the atmospheric temperature is high, such as in summer, the flow rate to the circulating water pipe 5 (heat exchange part) increases. The cooling water cooled in the cooling tower 9 is stored in the cooling tower water tank 10 and transferred to the circulation pump 1 again.

  Next, FIG. 3 shows a third embodiment of the present invention, and the description of the same components as those in the above-described example will be simplified. As shown in FIG. 3, this cooling facility also includes a cooling tower 9 in addition to the cooling facility in the first embodiment.

  In the present embodiment, the cooling water is cooled after being cooled through a circulating water pipe 5 (heat exchange part) installed in a cooling medium 4 (river, pond, lake, ocean, soil, etc.) outside the system. There is a circulating water pipe 5 that is directly transferred to the cooling tower water tank 10 without going through the tower 9. In addition, by closing the cooling tower inlet valve 11, it becomes possible to shield the inflow of cooling water to the cooling tower 9. By adopting this embodiment, in the winter season in cold regions, the temperature of the cooling water is not extremely reduced when frozen through the cooling tower 9, and the cooling tower and the accompanying equipment and piping are not frozen. It is not necessary to take measures to prevent freezing.

  According to the embodiment described with reference to FIGS. 1 to 3 above, the thermal power plant can be constructed if there is a cooling medium such as a river, pond, lake, ocean, or soil. It becomes. Moreover, since seawater is not transferred, shellfish do not adhere in piping, and it becomes unnecessary to construct a rubber lining and to remove shellfish regularly. In addition, when used in combination with cooling tower equipment, it is possible to compensate for the cooling performance of the cooling tower in the summer, to reduce the size of the cooling tower equipment, and to reduce the construction cost and construction site area. It becomes. In addition, depending on the connection configuration of the piping, the cooling water can be cooled without passing through the cooling tower, so that it is not necessary to take measures to prevent freezing in winter in cold regions.

The cooling water system diagram which shows the 1st Embodiment of this invention. The cooling water system diagram which shows the 2nd Embodiment of this invention. The cooling water system diagram which shows the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Circulation pump, 2, 5 ... Circulating water piping, 3 ... Condenser, 4 ... Cooling medium outside system, 6 ... Flow control valve, 7, 8 ... Thermometer, 9 ... Cooling tower, 10 ... Cooling tower water tank 11 ... Cooling tower inlet valve.

Claims (3)

  In the cooling water system of the thermal power generation equipment and the cooling water cooling system that circulates through the cooling water system, a part of the piping of the cooling water system is passed through the ground or water such as rivers, lakes, and oceans, A cooling facility configured to be used as a cooling medium for the cooling water.   In the cooling water system of a thermal power generation facility and cooling water flowing through the cooling water system, a heat exchanging part is provided for exchanging heat with a part of the piping of the cooling water system, and the heat exchange. The cooling unit is configured to pass through the ground or underwater such as a river, a lake, or the ocean and use it as a cooling medium for the cooling water. A cooling water system of a thermal power generation facility, wherein the cooling water system includes a cooling water cooling tower, and a part of the piping of the cooling water system upstream of the cooling tower is underground or in a river or lake A cooling system characterized by being configured to pass underwater such as the ocean and to be used as a cooling medium for cooling water flowing through the inside of the pipe.

Images