JP2008128592A - Cooling method for heat generation facility and cooling device for heat generation facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling method for a heat generation facility and a cooling device for the heat generation facility capable of economically maintaining a cooling capacity of a cooling tower even by rising of the atmospheric temperature. <P>SOLUTION: The cooling method is for the heat generation facility having cooling medium circulation systems 8, 13 for circulating a cooling medium between heat exchange parts 3, 9 and the cooling tower 4. When a cooling medium temperature of an outlet of the cooling tower 4 exceeds a normal value, a cooling medium passing amount of the cooling tower 4 is reduced while maintaining a cooling medium flow rate passing through one part of the heat exchangers 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat generation facility cooling method and a heat generation facility cooling apparatus for indirectly cooling a heat generation source such as thermal power, a nuclear power plant or an air conditioning facility in a building with a cooling medium. It is related with the cooling method of the heat generating equipment which needs to maintain the cooling temperature of a specific heat exchanging part in a predetermined range among a plurality of heat exchanging parts, and the cooling device of heat generating equipment.

  For example, in a cooling device for a heat generation facility that includes a cooling tower and indirectly cools a heat generation source, when the atmospheric temperature rises, the cooling capacity naturally decreases. Therefore, for example, a cooling device for a heat generation facility as disclosed in Patent Document 1 has already been proposed as a cooling device for a heat generation facility designed so that the cooling capacity of the cooling tower does not decrease.

JP 62-22998 A

  According to the above background art, in order to prevent the cooling capacity of the cooling tower from decreasing, the number of operating cooling tower fans or the number of cooling medium circulation pumps increased as the atmospheric temperature increases. It corresponds. As a result, the cooling capacity of the cooling tower is maintained, and regular cooling can be performed at each heat exchange unit. However, in order to do so, it is necessary to increase the number of fans and the number of circulation pumps, and the power consumed for these operations increases, which is economically problematic.

  An object of the present invention is to provide a cooling method for a heat generating facility and a cooling device for the heat generating facility that can economically maintain the cooling capacity of the cooling tower even when the atmospheric temperature rises.

  In order to achieve the above object, the present invention forms a cooling medium circulation system for circulating a cooling medium between a plurality of heat exchange units and a cooling tower, and a part of the plurality of heat exchange units. In the cooling method of the heat generating equipment, wherein the cooling medium temperature at the outlet of the cooling tower exceeds a specified value, the part of the heat generating equipment is cooled by maintaining the cooling temperature of the heat generating equipment in a predetermined range. The amount of cooling medium passing through the cooling tower is reduced while maintaining the flow rate of the cooling medium passing through the heat exchanger.

  As described above, when the temperature of the cooling medium at the outlet of the cooling tower exceeds a specified value due to an increase in the atmospheric temperature, the flow rate of the cooling medium that passes through some of the heat exchanging units is maintained. By reducing the amount of cooling medium passing through the cooling tower, the cooling medium passing through the cooling tower can be sufficiently cooled. That is, by restricting the flow rate of the cooling medium passing through the cooling tower, the cooling medium by the cooling tower can be efficiently cooled, so that the temperature rise can be suppressed. On the other hand, by restricting the flow rate of the cooling medium that passes through the cooling tower, there is a heat exchange unit in which the flow rate of the cooling medium is reduced, and the load on the heat generation equipment that is originally connected to the heat exchange unit is reduced. Although it is necessary, the cooling medium maintained at the required cooling temperature can be passed even if the flow rate of the cooling medium decreases, so that the cooling capacity can be maintained as compared with the cooling by the heated cooling medium. As a result, it is possible to prevent a significant reduction in the load on the heat generation facility.

  As described above, according to the present invention, in order to maintain the cooling capacity of the cooling tower, it is not necessary to add and operate a large number of fans and circulation pumps. The heat generating equipment cooling method and the heat generating equipment cooling apparatus capable of maintaining the cooling capacity of the heat generating equipment can be obtained.

  Hereinafter, a first embodiment of a heat generating facility cooling apparatus according to the present invention will be described based on the power plant cooling apparatus shown in FIG.

  The steam turbine 2 that is a heat generation facility connected to the generator 1 is rotationally driven by supplying superheated steam a from a steam generator (not shown), thereby generating electric power by rotationally driving the generator 1. ing. The steam that has finished its work in the steam turbine 2 is cooled by the condenser 3 and returned to the water b, and the water b becomes the superheated steam a again by the steam generator.

  The condenser 3 is a kind of heat exchange part for cooling the steam back to water. For this purpose, a cooling tower 4 is installed, and a cooling medium such as industrial water or purified river water is supplied from the cooling tower 4 to the condenser 3 through a cooling water supply pipe 5 to complete the work. Steam is indirectly cooled back to water. Then, the water cooling water heated by returning the steam to the water by the condenser 3 is returned to the cooling tower 4 by the cooling water return pipe 6 and cooled. The cooling water cooled back to the cooling tower 4 is stored in the lower tank 4T provided at the bottom. In order to supply the cooling water accumulated in the lower tank 4T to the condenser 3 through the cooling water supply pipe 5, a first circulation pump 7 is provided in the cooling water supply pipe 5.

  Thus, the first cooling medium circulation system 8 is formed by the cooling tower 4-the lower tank 4 T-the cooling water supply pipe 5-the first circulation pump 7-the condenser 3-the cooling water return pipe 6.

  On the other hand, the power plant is provided with a plurality of auxiliary machine coolers 9 (9A to 9C), for example, for cooling the bearings of the steam turbine 2 and other heat generating parts. And this auxiliary machine cooler 9 comprises some heat exchange parts among several heat exchange parts. For this purpose, an auxiliary machine cooling water supply pipe 10 is connected to supply the cooling water from the cooling tower 4 to the auxiliary machine cooler 9 and is carried by the supplied cooling water, for example, from the heat generation part of the bearing. The heated lubricating oil is indirectly cooled by the auxiliary cooler 9. The cooling water that has been heated after the cooling of the lubricating oil is returned from the auxiliary machine cooler 9 to the cooling water return pipe 6 through the auxiliary machine cooling water return pipe 11. Then, in order to supply the cooling water accumulated in the lower tank 4T to the auxiliary machine cooler 9 through the auxiliary machine cooling water supply pipe 10, a second circulation pump 12 is provided in the auxiliary machine cooling water supply pipe 10. Is provided. By the way, the auxiliary machine cooler 9 needs to supply cooling water having a substantially constant cooling temperature in order to maintain the temperature of the lubricating oil within a predetermined range in order to eliminate a decrease in the lubricating capacity due to the temperature rise of the lubricating oil. For this reason, it is necessary to maintain a constant flow rate of the cooling medium passing so as to maintain the cooling temperature of the auxiliary machine cooler 9 within a predetermined range.

  Thus, the second cooling medium circulation system is formed by the cooling tower 4-the lower tank 4T-the auxiliary coolant water supply pipe 10-the second circulation pump 12-the auxiliary equipment cooler 9-the auxiliary equipment cooling water return pipe 11. 13 is formed.

  In the above configuration, an electromagnetic flow rate adjusting valve 14 serving as a cooling medium flow rate adjusting means is provided on the upstream side of the connection portion of the cooling water return tube 6 with the auxiliary coolant return pipe 11 and this electromagnetic flow rate adjusting valve. 14 is provided with a control means 15 for outputting a drive command, and furthermore, a temperature detection means for measuring and outputting the cooling water temperature in the lower tank 4T, in other words, the cooling water temperature at the outlet of the cooling tower 4, to the control means 15. 16 is provided.

  When the atmospheric temperature rises during operation of the power plant (heat generation facility) having the above configuration, naturally, the cooling capacity of the cooling tower 4 decreases, and the condenser 3 as each heat exchange unit from the lower tank 4T. And the temperature of the cooling water supplied to the auxiliary machine cooler 9 also rises. Therefore, the temperature detection means 16 detects the temperature of the cooling water in the lower tank 4T, calculates the detection signal by the control means 15, and the cooling water temperature is a predetermined range of the cooling water temperature required for the auxiliary machine cooler 9. When the maximum value is exceeded, a drive command is output to the electromagnetic flow rate control valve 14 to drive in a direction to limit the flow rate of the coolant circulating through the first coolant circulation system 8.

  When the flow rate of the cooling water circulating through the first cooling medium circulation system 8 is limited, the flow rate of the cooling water passing through the condenser 3 and the cooling tower 4 is naturally reduced.

  The cooling tower 4 is a facility that lowers the temperature of the cooling water that has been heated by bringing the air introduced into the cooling tower 4 into contact with the cooling water, so that the flow rate of the cooling water that passes through the cooling tower 4 decreases. Therefore, the cooling water can be efficiently cooled by the reduced amount, and the raised cooling water can be lowered within a predetermined range. As a result, the amount of heat exchange in the condenser 3 and the auxiliary machine cooler 9 is constant, while the amount of heat exchange in the cooling tower 4 increases. It is possible to prevent a decrease in heat exchange capacity in the water device 3 and the auxiliary device cooler 9.

  And since the flow volume of the cooling water in the 2nd cooling-medium circulation system | strain 13 containing the auxiliary machine cooler 9 is not restrict | limited, cooling within a regulation temperature range can be continued.

  On the other hand, in the first cooling medium circulation system 8, the flow rate of the cooling water is limited, so that the condensing capacity for returning the steam a to the water is reduced, and the output of the steam turbine 2 is accordingly reduced. descend. However, since the cooling water that has been heated in the condenser 3 is efficiently cooled due to the restriction of the water flow rate, it is possible to suppress a significant decrease in the cooling capacity in the cooling tower 4, so the rate of decrease in the output of the steam turbine 2 can be reduced. It can be held down slightly.

Incidentally, in the present embodiment, the output of the steam turbine 1 is 28 MW, the heat load of the condenser 3 is 215 × 10 ⁶ kJ / h, the allowable water flow rate of the condenser 3 is 4700 m ³ / h, the cooling tower 4 In a power plant with a thermal load of 250 × 10 ⁶ kJ / h and a permissible amount of water passing through the cooling tower 4 of 5900 m ³ / h, the flow rate of cooling water passing through the cooling tower 4, in other words, passing through the condenser 3. When the flow rate of the cooling water is reduced by about 30%, the temperature of the cooling water supplied from the lower tank 4T of the cooling tower 4 can be reduced by about 2 ° C., and the output of the steam turbine 2 at that time is reduced by about 2%. Just do it.

  However, in the same power plant, when the flow rate of the cooling water passing through the condenser 3 and the cooling tower 4 is kept constant, the temperature of the cooling water supplied from the lower tank 4T of the cooling tower 4 is reduced by about 2 ° C. It is necessary to reduce the steam turbine load by about 30%.

  Thus, with respect to the increase in the cooling water temperature due to the atmospheric temperature increase, by limiting the flow rate of the cooling water that passes through the cooling tower 4, the temperature of the cooling water supplied to the auxiliary machine cooler 9 is within a specified range. It is desirable to reduce the output of the steam turbine 2 slightly while maintaining the above, and the influence on the surroundings can be minimized.

  And according to this Embodiment, in order to improve the cooling capacity of the cooling tower 4, it is not necessary to add and operate many fans and circulation pumps, and it is economical.

  FIG. 2 shows a second embodiment of the cooling device for heat generation equipment according to the present invention. The same reference numerals as those in FIG. 1 (first embodiment) denote the same components, so that the detailed description is repeated. Description is omitted.

  In this embodiment, there are two points different from the first embodiment. The first point is the temperature of the cooling water on the inlet side of the auxiliary cooler 9 of the second cooling medium circulation system 13. This is a point that is detected by the temperature detecting means 16.

  As described above, since the auxiliary machine cooler 9 needs to be cooled within the range of the specified temperature, the cooling water temperature can be set more accurately than when the cooling water temperature in the lower tank 4T of the cooling tower 4 is measured. Can be measured. That is, even if the cooling water temperature in the lower tank 4T is maintained at a specified value, the lower tank 4T and the auxiliary machine cooler 9 are separated from each other, and the auxiliary machine cooling water supply pipe 10 is laid for a long time. If there is a factor that positively increases the temperature of the machine cooling water supply pipe 10, the cooling water temperature may rise while reaching the auxiliary machine cooler 9 from the lower tank 4 </ b> T. In that case, if the flow rate of the cooling water passing through the cooling tower 4 is limited based on the temperature of the cooling water in the cooling tower 4, the auxiliary machine cooler 9 cannot be supplied with the cooling water having a temperature within the specified range. There is a risk of hindering the cooling of auxiliary equipment. Therefore, the temperature of the cooling water at the inlet side of the auxiliary machine cooler 9 is measured to accurately measure whether or not the cooling water temperature is within the specified range, and based on this, the control means 15 passes the cooling tower 4. By limiting the cooling water flow rate, the auxiliary water cooler 9 can be always supplied with cooling water having a temperature within the specified range.

  The second point different from the first embodiment is that, in the first embodiment, the dedicated electromagnetic flow control valve 14 is provided as the cooling medium flow control means, but in the present embodiment, the first The circulation pump 7 is a variable-speed circulation pump, and this variable-speed circulation pump is used as a cooling medium flow rate adjusting means, so that the flow rate of the cooling water passing through the cooling tower 4 is limited.

  As described above, when the cooling water flow rate is limited by using the first circulation pump 7 as a variable speed circulation pump, the number of rotations of the pump driving motor may be reduced, and the number of rotations can be reduced. As a result, the power consumption of the pump driving motor can be reduced.

  According to the present embodiment, the same effect as in the first embodiment can be obtained, the coolant temperature to the auxiliary machine cooler 9 can be accurately managed, and the power consumption of the pump drive motor when the coolant flow rate is limited. This has the effect of reducing the amount, and further has the effect that it is not necessary to provide a dedicated cooling medium flow rate adjusting means.

  FIG. 3 shows a third embodiment of the cooling apparatus for heat generation equipment according to the present invention. The same reference numerals as those in FIG. 1 (first embodiment) denote the same components, so that the detailed description is repeated. Description is omitted.

  Usually, the inlet side and the outlet side of the condenser 3 in the first cooling medium circulation system 8 are provided in the cooling water supply pipe 5 and the cooling water return pipe 6 during maintenance inspection including the condenser 3. An inlet side valve 17 and an outlet side valve 18 are provided so that the cooling water does not flow out. In the present embodiment, the outlet side valve 18 is an electromagnetic flow rate control valve, and the electromagnetic flow rate control valve is driven by a command from the control means 15 to limit the amount of water flowing through the cooling tower 4 of the cooling water. It was.

  In this embodiment, the outlet side valve 18 is an electromagnetic flow rate control valve, but the inlet side valve 17 is an electromagnetic flow rate control valve, and the opening degree is controlled by the control means 15 as indicated by a two-dot chain line. It may be.

  This embodiment also has the effect that it is not necessary to provide a dedicated coolant flow rate adjusting means in addition to the same effects as the first embodiment.

  As described above, according to each embodiment, when the cooling water temperature at the outlet of the cooling tower exceeds the specified value due to the increase in the atmospheric temperature, the cooling water temperature of the auxiliary cooler is maintained while passing through the cooling tower. Since the cooling water can be sufficiently cooled, the condenser can be cooled without significantly reducing the load on the heat generation facility.

  By the way, although each embodiment demonstrated the cooling device of the power generation plant as an example of a heat generation facility, it is not limited to this, and a plurality of cooling medium circulation systems having a heat exchanging unit are provided via a cooling tower. For example, the present invention can also be applied to a heat generation facility such as an air conditioning facility in a building.

The block diagram of the cooling device of the power plant which shows 1st Embodiment of the cooling device of the heat generating equipment by this invention. The block diagram of the cooling device of the power plant which shows 2nd Embodiment of the cooling device of the heat generating equipment by this invention. The block diagram of the cooling device of the power plant which shows 3rd Embodiment of the cooling device of the heat generating equipment by this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Generator, 2 ... Steam turbine, 3 ... Condenser, 4 ... Cooling tower, 4T ... Lower tank, 5 ... Cold water supply pipe, 6 ... Cooling water return pipe, 7 ... 1st circulation pump, 8 ... 1st 1 Cooling medium circulation system, 9 (9A to 9C) ... Auxiliary cooler, 10 ... Auxiliary cooling water supply pipe, 11 ... Auxiliary cooling water return pipe, 12 ... Second circulation pump, 13 ... No. 2 cooling medium circulation system, 14 ... electromagnetic flow control valve, 15 ... control means, 16 ... temperature detection means, 17 ... inlet side valve, 18 ... outlet side valve.

Claims (14)

  A cooling medium circulation system that circulates the cooling medium between the plurality of heat exchange units and the cooling tower is formed, and the cooling temperature of some of the plurality of heat exchange units is maintained within a predetermined range. In the method for cooling the heat generating equipment, the heat generating equipment is cooled, and when the cooling medium temperature at the outlet of the cooling tower of the cooling medium circulation system exceeds a specified value, it passes through a part of the heat exchanging section. A cooling method for a heat generating facility, wherein the cooling medium passage amount of the cooling tower is decreased while maintaining a cooling medium flow rate.   The method for cooling a heat generating facility according to claim 1, wherein the specified value of the cooling medium temperature is a maximum value of the cooling temperature of the partial heat exchange section maintained in a predetermined range.   A cooling medium circulation system for circulating a cooling medium is formed between the condenser of the heat generating equipment and the auxiliary equipment cooler of the heat generating equipment and the cooling tower, and the cooling temperature of the auxiliary equipment cooler is maintained within a predetermined range. In the cooling method of the heat generating equipment, the heat generating equipment is cooled in this way, when the coolant temperature between the outlet of the cooling tower and the inlet of the auxiliary equipment cooler exceeds a specified value, the auxiliary equipment cooling is performed. A cooling method for a heat generating facility, wherein the cooling medium passage amount of the cooling tower is reduced while maintaining a cooling medium flow rate passing through the vessel.   The method of cooling a heat generating facility according to claim 3, wherein a flow rate of the cooling medium passing through the condenser is limited to reduce a cooling medium passing amount of the cooling tower.   The method for cooling a heat generating facility according to claim 3 or 4, wherein the specified value of the cooling medium temperature is a maximum value of a cooling temperature of the auxiliary machine cooler.   A cooling medium circulation system for circulating a cooling medium between the plurality of heat exchanging units and the cooling tower, and maintaining a cooling temperature of a part of the heat exchanging units within a predetermined range among the plurality of heat exchanging units; In the cooling device for a heat generation facility configured as described above, a cooling medium that is provided in the cooling medium circulation system and restricts a cooling medium flow rate that passes through the cooling tower while maintaining a cooling medium flow rate that passes through the partial heat exchange unit A flow rate adjusting means, a temperature detecting means for detecting a cooling medium temperature at the outlet of the cooling tower, and when the temperature measured by the temperature detecting means exceeds a specified value, the cooling tower is adjusted to the cooling medium flow rate adjusting means. A cooling device for a heat generating facility, comprising: a control means for outputting a restriction command for a flow rate of the cooling medium passing therethrough.   The cooling device for a heat generation facility according to claim 6, wherein the specified value of the cooling medium temperature is a maximum value of the cooling temperature of the partial heat exchange unit maintained in a predetermined range.   A cooling medium circulation system for circulating a cooling medium between the condenser of the heat generating equipment and the auxiliary equipment cooler and the cooling tower of the heat generating equipment is maintained, and the cooling temperature of the auxiliary equipment cooler is maintained within a predetermined range. In the cooling device for a heat generation facility configured as described above, a cooling medium flow rate that restricts a cooling medium flow rate that passes through the cooling tower while maintaining a cooling medium flow rate that is provided in the cooling medium circulation system and that passes through the accessory cooler Adjusting means, temperature detecting means for detecting the temperature of the cooling medium at the outlet of the cooling tower, and when the temperature measured by the temperature detecting means exceeds a specified value, the cooling medium flow rate adjusting means passes through the cooling tower. And a control means for outputting a restriction command for the cooling medium flow rate.   9. The heat generating facility according to claim 8, wherein the cooling medium flow rate adjusting means limits a cooling medium flow rate passing through the condenser to reduce a cooling medium passing amount of the cooling tower. Cooling system.   9. The cooling apparatus for a heat generation facility according to claim 8, wherein the cooling medium flow rate adjusting means is a circulation pump for circulating the cooling medium from the cooling tower to the condenser.   9. The cooling of a heat generation facility according to claim 8, wherein the cooling medium flow rate adjusting means is a throttle valve that is installed upstream and / or downstream of the condenser and that operates according to a command from the control means. apparatus.   12. The cooling device for a heat generation facility according to claim 8, 9, 10 or 11, wherein the temperature detecting means is installed on an inlet side of the auxiliary machine cooler.   The cooling device for a heat generation facility according to claim 8, 9, 10, or 11, wherein the specified value of the cooling medium temperature is a maximum value of a cooling temperature of the auxiliary machine cooler.   A condenser of the heat generation facility, an auxiliary machine cooler of the heat generation facility, a cooling tower for cooling a cooling medium passing through the condenser and the auxiliary machine cooler, the condenser and the cooling tower, A first cooling medium circulation system in which a first circulation pump for circulating the cooling medium is installed, and a second circulation pump for circulating the cooling medium between the auxiliary machine cooler and the cooling tower. In the cooling device for a heat generating facility configured to maintain the cooling temperature of the auxiliary machine cooler in a predetermined range, the first circulation pump is a variable speed circulation pump. And a temperature detecting means for detecting the temperature of the cooling medium on the inlet side of the auxiliary machine cooler provided in the second cooling medium circulation system, and the temperature measured by the temperature detecting means has a specified value. When exceeded, the variable speed circulation pump Cooling device for a hot generating facility, characterized in that a control means for outputting a limiting command of the cooling medium throughput passing 却塔.

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