JPH07158467A - Intake air cooling device utilizing ice heat reserve for gas turbine - Google Patents

Abstract

PURPOSE:To keep the intake air temperature of a gas turbine in a combined cycle power plant low so as to prevent the output lowering of the gas turbine at the time of load increase due to cooling or the like. CONSTITUTION:An intake air cooling device utilizing ice heat reserve for a gas turbine is provided with an air cooler 6 installed at the intake air inlet of the gas turbine 3, an ice making machine 8 for manufacturing charvet like ice, and a piping device for feeding the charvet like ice 11 and cooling water into the cooling pipes 7 of the air cooler 6 directly from the ice making machine 8. The cooled air can be supplied into the gas turbine 3 from the intake port, so that the output lowering of the gas turbine 3 caused by the rise of the intake air temperature can be suppressed, and a combined cycle power plant can sufficiently cope with load increase due to cooling or the like. Since this intake air cooling device does not need an ice storage tank which is a large-sized structure, the installation space of the combined cycle power plant can be reduced by a large margin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine, and more particularly to an intake heat cooling device using ice heat of a gas turbine for cooling intake air at the inlet of the gas turbine by utilizing ice heat storage.

[0002]

2. Description of the Related Art Power generation using a gas turbine is
It has been increasing recently due to the development of steam combined cycle. However, since the output of the gas turbine is greatly affected by the weight flow rate of the intake air, when the temperature is high from early summer to early autumn, the air density is low, so the intake air weight flow rate is also low and the output of the gas turbine is reduced. . On the other hand, when the temperature is high, the demand for electricity becomes maximum due to cooling. That is, the output of the gas turbine decreases when the power demand is greatest. To deal with this, it is considered to install a gas turbine for peak load separately.

As a method of preventing the output decrease of the gas turbine due to the temperature rise, there is cooling of the intake air. As an example, there is so-called ice heat storage cooling in which ice is made by surplus power at night and this ice is used for intake air cooling at the peak. This ice heat storage cooling is to cool the intake air with cold water obtained by the defrosting of ice produced by surplus power at night, and FIG. 16 is a system diagram of an example of a conventionally considered ice storage air intake cooling device. Is. In this figure,
The compressor 1 supplies compressed air to the combustor 2, and the combustion gas generated in the combustor 2 is supplied to the gas turbine 3. Reference numeral 4 in the figure denotes a generator driven by the gas turbine. On the intake side of the compressor 1, a cooling system for cooling the intake air is provided. This cooling system includes an intake duct 5 that is open to the atmosphere, an air cooler 6 that has a cooling pipe 7, an ice maker 8 that is driven by, for example, surplus power at night, and cold water between the ice maker 8 and an ice storage tank 15. Pump 9 for circulating
And a pump 9'for sending cold water in the ice storage tank 15 to the cooling pipe 7 and returning it to the ice storage tank 15, and an intake pipe of the compressor 1, which is connected to the atmosphere or the cooling pipe. It has a switching valve 32 for switching between 6 communication. In the figure,
The solid line shows the flow of cold water and the broken line shows the flow of air.

As can be seen from this figure, the conventional cooling method requires the air cooler 6, the ice making machine 8, the pumps 9 and 9 ', the ice storage tank 15, the switching valve 32, etc. Compared to installing a gas turbine for peak load separately, there is no merit in terms of cost and space, so it has not been put to practical use.

[0005]

As described above, a power plant using a gas turbine has a short construction period and a short start-up time, and a gas / steam combined cycle power plant combining a gas turbine and a steam turbine. Has gained significant popularity recently because of its extremely high efficiency. However, since the output of the gas turbine is greatly affected by the weight flow rate of the intake air, the output decreases when the temperature is high and the power demand is maximized due to cooling or the like.

As a method of preventing the output decrease of the gas turbine due to the temperature rise, there is cooling of the intake air. As an example, there is so-called ice heat storage cooling in which ice is made by surplus power at night and this ice is used for intake air cooling at the peak.

In order to carry out the above-mentioned conventionally considered intake air cooling method, a large-sized component device such as an air cooler, an ice making machine and an ice storage tank is required, which causes a problem in terms of cost and space. As described above. In addition, while the cold water obtained by defrosting the ice from the ice storage tank installed at a position away from the gas turbine is transferred to the air cooler by the pipe, the pipe is pushed to remove the cold heat from the atmosphere and the cooling efficiency is reduced. There is also a problem to do. The present invention has been made based on the above circumstances, and provides an intake heat cooling device using ice heat storage for a gas turbine, which can be installed in a small installation space and at low cost.

[0008]

According to the present invention, there is provided an intake air cooling apparatus for ice heat storage of a gas turbine, an air cooler installed at an intake inlet of a gas turbine, an ice maker for producing sherbet-like ice, and the above air cooling. The cooling pipe of the vessel is provided with a shelvet-like ice and a piping device for feeding cooling water directly from the ice making machine or via an ice storage tank, and the cooled air is fed from the intake inlet to the gas turbine.

[0009]

In the above-structured gas turbine ice heat storage intake air cooling device, the ice making machine is operated by surplus power at night to make sherbet-like ice, and this ice is directly fed into the cooling pipe of the cooler or through the ice storage tank. In this case, the intake air to the gas turbine is cooled by the cooler when the load is increased in the daytime and stored in the ice storage tank and the cooling pipe. By disposing the ice storage tank directly above or below the air cooler, the installation space of the intake air cooling device can be greatly reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 in which the same parts as in FIG.
FIG. 1 is a system diagram of an intake air cooling device using ice heat storage according to a first embodiment of the present invention. In this figure, in the air cooler 6, a pipe 8a having one end communicated with the outlet of the ice maker 8 via a valve 10 and the other end communicated with the inlet of the ice maker 8 via a pump 9
A plurality of straight, large-diameter vertical cooling pipes 7 are provided. The intake of air to the compressor 1 is performed by cooling the air taken in from the intake duct 5 by the air cooler 6. In the figure, 11 is sherbet-shaped ice supplied from the ice making machine 8 into the cooling pipe 7 through the pipe 8a, white arrows 12 are the sherbet-shaped ice flows, and solid arrows 13 are water flows. Shows.

In the embodiment having the above structure, the ice sent from the ice making machine 8 to the pipe 8a is in the form of sherbet, and the sherbet-like ice is stored in the vertical cooling pipe 7.
The ice maker 8 is operated by surplus power at night, and cold heat is stored in the form of sherbet-like ice in the cooling pipe 7. Thus, when the daytime temperature rises, the intake air is passed through the cooler 7 to lower the intake air temperature to prevent the output of the gas turbine 3 from decreasing, and to cope with the increased demand due to the load such as cooling. it can.

In the first embodiment, since the sherbet-like ice is directly sent from the ice making machine to the cooling pipe 7, unlike the conventional example shown in FIG. The installation space can be reduced without the need for piping for sending cooling water from the tank or ice storage tank to the cooler. Further, by shortening the space between the ice maker and the air cooler, the sherbet-like ice having a large amount of cold heat can be used for direct cooling, and the loss of cold heat in the piping can be minimized. It can be performed.

2 in which the same parts as those in FIG. 1 are designated by the same reference numerals.
[Fig. 4] is a system diagram of an intake air cooling device using ice heat according to a second embodiment of the present invention. In this embodiment, each vertical cooling pipe 7 is opened at the upper end thereof to the bottom surface of the ice storage tank 15 installed above the cooler 6, and the pipe 8 a from the ice making machine 8 is provided below the cooler 6. A branch pipe 8b reaching the installed drain tank 17 is provided. A drain valve 16 and a drain pump 17 are provided on the branch pipe 8b.

In the second embodiment, not only can the air be cooled with high efficiency as in the first embodiment, but the ice storage tank 15 is installed above the cooler 6, More sherbet-like ice than in the first embodiment can be stored, and the air can be cooled for a long time. It should be noted that, with the passage of time, although the ice storage tank 15 has a sufficient amount of sherbet-like ice, the ice in the cooling pipe 7 melts and disappears,
It is possible that the cooling term will drop. In that case, the drain valve 16 is opened to drop the water in the cooling pipe 7 into the drain tank 17, and the sherbet-like ice of the ice storage tank 15 is dropped into the cooling pipe 7 to continue highly efficient cooling of the water. can do. After the cooling is completed, the drain pump 18 is reversed to return the water in the drain tank 17 to the ice storage tank 15 to recover the water level.

FIG. 3 in which the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals is a system diagram of an intake air cooling apparatus using ice storage according to a third embodiment of the present invention. In this embodiment, the cooling pipe 7 is installed below the cooler 6 and protrudes from the upper surface of the ice storage tank 15.

In the third embodiment, since the ice storage tank 15 is provided, it is possible to store a larger amount of ice than in the first embodiment, so that air cooling can be performed for a long time. As the cooling of the air continues, the sherbet-like ice in the cooling pipe 7 melts and decreases, but the sherbet-like ice in the ice storage tank 15 successively rises in the cooling pipe 7 due to buoyancy. Therefore, the cooling capacity of the cooler 6 does not decrease.

FIG. 4, in which the same parts as those in the previous drawings are designated by the same reference numerals, is a system diagram of an intake-air cooling device using ice storage according to a fourth embodiment of the present invention. In this figure, an ice storage tank 15 installed below the cooler 6 is connected to a water storage tank 19 via a water supply pump 20 and a water storage tank valve 21. In addition, each cooling pipe 7
The lower end of is opened to the upper wall of the ice storage tank 15 via a valve 22, and an air vent pipe 23 is connected to the upper end thereof, and each air vent pipe 23 is provided with an air vent valve 24.

In the fourth embodiment, the ice storage tank 15
A vertical cooling pipe 7 is directly connected to the container, and the sherbet-shaped ice in the ice storage tank 15 is stored while being prevented from solidifying.
That is, at the time of cooling, by opening the valve 22 and supplying water from the water storage tank 19 to the ice storage tank 15 by the water supply pump 20, the water level of the ice storage tank 15 is raised and the cooling pipe 7 is filled with the sherbet-like ice 11. At that time, the air vent pipe 23 of each cooling pipe 7
The air vent valve 24 is opened to release the air in the cooling pipe 7 so as not to prevent the sherbet-like ice from entering the cooling pipe 7. At the same time when cooling is started, the water tank valve 21 and the air vent valve 24 are closed. During cooling, the sherbet-shaped ice 11 from the ice storage tank 15 is cooled by the buoyant force of the cooling pipe 7.
Always supplied to.

When the cooling is completed, the air vent valve 24 and the water storage tank valve 21 are opened, and the water in the ice storage tank 15 is stored in the water storage tank 19.
Then, the water level of the ice storage tank 15 is lowered, and ice making and ice storage are started by the surplus power at night.

FIG. 5, in which the same parts as those in the previous drawings are designated by the same reference numerals, is a system diagram of an intake air cooling apparatus using ice storage according to a fifth embodiment of the present invention. In this figure, as in the case of the fourth embodiment, the upper end of the cooling pipe 7 whose lower end is opened in the upper wall of the ice storage tank 15 is provided with a circulation pump 25 in the middle and the lower end via a circulation flow path valve 26. Circulation line 7a opened to the side wall of the tank 15
Is in communication with. An air vent pipe 23 and an air vent valve 24 are provided in the transverse portion of the circulation pipe 7a.

In the fifth embodiment, the circulation pump 25 forcibly circulates through the cooling pipe 7, the circulation pipe line 7a and the ice storage tank 15, so that an ascending flow is generated in the cooling pipe 7 to store ice. The sherbet-shaped ice 11 in the tank 15 is positively fed into the cooling pipe 7.

FIG. 6, in which the same parts as those in the previous drawings are designated by the same reference numerals, is a system diagram of an intake-air cooling device using ice storage according to a sixth embodiment of the present invention. In this figure, a bypass branch pipe 7b communicating with the lower part of the cooling pipe 7 is provided downstream of the circulation pump 25 in the circulation pipe line 7a in the fifth embodiment.
Is provided. Circulation pipe 7a and bypass branch pipe 7b
A bypass flow path valve 27 is provided between and.

In the sixth embodiment, the circulation passage valve 26 and the bypass passage valve 27 are adjusted to adjust the ice storage tank 1
The amount of rise of the sherbet-shaped ice 11 in 5 to the cooling pipe 7 can be set to an optimum value.

FIG. 7, in which the same parts as those in the previous drawings are designated by the same reference numerals, is a system diagram of an intake heat cooling device using ice storage according to a seventh embodiment of the present invention. In this figure, a temperature sensor 28 for detecting the temperature of the cooling portion of the cooler 6, a temperature adjusting valve between the outlet of the ice making machine 8 and the ice storage tank 15 and the position of the bypass flow passage valve 27 of the sixth embodiment. 29, and a temperature control device 30 that controls the circulation pump 25 and each temperature adjusting valve 29 by using the output of the temperature sensor 28 as a control input to keep the temperature in the cooler 6 at an optimum value.

In this embodiment, the temperature inside the cooler 6 is maintained at an optimum value by controlling the circulation pump 25 and each temperature adjusting valve 29 as described above, and the sherbet-shaped ice 1
1 is used for cooling for a long time without waste.

FIG. 8 in which the same parts as those in the previous drawings are designated by the same reference numerals is a system diagram of an intake air cooling device using ice heat storage according to an eighth embodiment of the present invention. In this figure, the ice storage tank 15 is installed above the cooler 6, the cooling pipe 7 of the cooler 6 is connected at its lower end to the pipe 8a from the outlet of the ice maker 8, and the upper end of the cooling pipe 7 is cooled. It is opened at the bottom of the ice storage tank 15 installed above the container 6. An air vent pipe 23 and an air vent valve 24 are provided on the upper wall of the ice storage tank 15. further,
A damper 32 for switching the flow path is provided in the pipeline between the cooler 6 and the compressor 1.

In the intake air cooling device using ice heat storage of the eighth embodiment, the air that has passed through the cooler 6 is supplied to the compressor 1 during cooling by operating the damper 32, and in other cases, room temperature air is left as it is. Supply to the compressor 1. Since the flow paths are switched as described above, the sherbet-shaped ice 11 in the cooling pipe 7 is stored almost as it is before the start of cooling when the cooling is not performed. Further, when the air passes through the cooler 6, a pressure loss occurs, but by preventing the intake air from passing through the cooler 6 when the cooling is not performed, a decrease in efficiency due to the pressure loss is prevented. be able to.

FIG. 9 in which the same parts as those in the previous drawings are denoted by the same reference numerals is shown in FIG. 9 in which an intake air cooling device of an embodiment of the present invention, for example, an intake air cooling device using ice heat storage, is shown in FIG.
It is a system diagram of an example applied to a steam turbine combined cycle power generation plant. In this figure, the compressor 1, the gas turbine 3, and the steam turbine 34 are uniaxially provided, and a generator (not shown) is driven by each turbine to generate electricity. In the figure, 35 is an exhaust heat recovery boiler that receives the exhaust gas from the gas turbine 3 and generates steam for driving the steam turbine 34, 36 is a condenser, and 37 is a water supply pump.

In the combined cycle power plant of this structure, since the intake heat cooling device using ice storage of the present invention is provided, the intake temperature to the gas turbine 3 is kept low even when the temperature is high, and There is no decrease in output due to increase. Therefore, it is possible to well cope with an increase in load due to cooling or the like when the summer temperature is high.

10 to 12 are schematic views showing an example of the arrangement of the cooling pipes 7 and the shape of the cooling pipes 7 in each embodiment of the present invention. Generally, in an air cooler, the cooling pipe 7 is horizontally arranged in the cooler 6 as shown in FIG. 10 to improve the efficiency as a countercurrent type, and the condensed water vapor in the atmosphere is dripped on the cooling pipe surface. It's easy. However, in such an arrangement, there is a possibility that sherbet-shaped ice may be clogged in the bent portion for the cooling pipe 7 to move to the adjacent transverse portion.

FIG. 11 shows the cooling pipe 7 which is inclined with respect to the horizontal in order to facilitate the inflow of sherbet-like ice from the ice storage tank. Furthermore, FIG.
What is shown in (1) is that the cooling pipe 7 is arranged vertically in the cooler 6 to further facilitate the inflow of sherbet-like ice. 13 to 15 show that the cooling fins 33 are provided on the outer circumference of the cooling pipe 7 to increase the contact area between the air and the cooling pipe 7 to improve the cooling efficiency. As shown in FIG. 13, in the fins 33 provided in a simple spiral shape, when the cooling pipes 7 are arranged to be inclined with respect to the horizontal, the angle of the fins 33 becomes close to horizontal, and water vapor in the atmosphere is condensed. The dew condensation that occurs is likely to stay on the surface of the fin 33. The fins 33 shown in FIGS. 14 and 15 are for preventing the accumulation of the above-mentioned dew condensation, and the fins 33 are the fins 3 in each of the above figures depending on the arrangement angle of the cooling pipe 7.
In order to increase the density of the fins 33, the number of the fins 33 is increased in accordance with the leads of the fins 33 in order to increase the density of the fins 33. As a result, even if the cooling pipe 7 is arranged so as to be inclined with respect to the horizontal, there is no risk of water droplets staying on the fins 33.

[0032]

EFFECTS OF THE INVENTION As is clear from steam, in the intake heat cooling device for ice heat storage of a gas turbine of the present invention, it is not necessary to provide an ice storage tank which is large and box-shaped and requires a large installation space. Since the ice storage tank is placed three-dimensionally on top of the cooler, the installation space of the intake heat cooling device using ice heat storage can be greatly reduced. Also,
Since the distance from the ice maker to the air cooler can be minimized, the cooling heat loss of the coolant during the transfer can be significantly reduced, and highly efficient cooling can be performed.

[Brief description of drawings]

FIG. 1 is a system diagram of an intake air cooling device using ice heat storage according to a first embodiment of the present invention.

FIG. 2 is a system diagram of an intake air cooling device using ice heat storage according to a second embodiment of the present invention.

FIG. 3 is a system diagram of an intake air cooling device using ice heat storage according to a third embodiment of the present invention.

FIG. 4 is a system diagram of an intake air cooling device using ice heat storage according to a fourth embodiment of the present invention.

FIG. 5 is a system diagram of an intake air cooling device using ice heat storage according to a fifth embodiment of the present invention.

FIG. 6 is a system diagram of an intake air cooling device using ice heat according to a sixth embodiment of the present invention.

FIG. 7 is a system diagram of an intake heat cooling device using ice heat storage according to a seventh embodiment of the present invention.

FIG. 8 is a system diagram of an intake air cooling device using ice heat storage according to an eighth embodiment of the present invention.

FIG. 9 is a system diagram of an embodiment of the present invention, for example, an example of applying the ice heat storage intake air cooling device of the fifth embodiment to a gas turbine / steam turbine combined cycle power generation plant.

FIG. 10 is a schematic view showing a general arrangement of cooling pipes in an air cooler.

FIG. 11 is a schematic view of a first example of arrangement of cooling pipes in each of the above embodiments.

FIG. 12 is a schematic view of a second example of the arrangement of cooling pipes in each of the above embodiments.

FIG. 13 is a schematic view of a third example of the arrangement of cooling pipes in each of the above embodiments.

FIG. 14 is a schematic view of a fourth example of the arrangement of cooling tubes in each of the above embodiments.

FIG. 15 is a schematic view of a fifth example of the arrangement of cooling pipes in each of the above embodiments.

FIG. 16 is a system diagram of an example of an intake air cooling device using ice heat that has been conventionally considered.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Combustor 3 ... Gas turbine 4 ... Generator 5 ... Intake duct 6 ... Air cooler 7 ... Cooling pipe 8 ... Ice machine 9 ... Pump 10 ... Valve 11 ... Sherbet-like ice 12 ... Ice flow 13 ... Flow of water 15 ... Ice storage tank 16 ... Drain valve 17 ... Drain tank 18 ... Drain pump 19 ... Water storage tank 20 ... Water supply pump 21 ... Water storage tank valve 22 ... Valve 23 ... Air vent pipe 24 ... Air vent valve 25 ... Circulation pump 26 ... Circulation flow passage valve 27 ... Bypass flow passage valve 28 ... Temperature sensor 29 ... Temperature adjustment valve 30 ... Temperature control device

Claims (12)

[Claims] 1. An air cooler installed at an intake inlet of a gas turbine, an ice making machine for producing sherbet-like ice, and a piping device for sending sherbet ice and cooling water from the ice making machine to the air cooler. An intake air cooling device using ice heat storage for a gas turbine, comprising: supplying cooled air to the gas turbine from the intake inlet. 2. The gas turbine according to claim 1, further comprising an ice storage tank which is directly connected to the air cooler and which stores sherbet-like ice from the ice making machine, is provided directly above the air cooler. Intake cooling system using ice heat storage. 3. The gas turbine according to claim 1, further comprising an ice storage tank which is directly connected to the air cooler and which stores sherbet-like ice from the ice making machine, is provided directly below the air cooler. Intake cooling system using ice heat storage. 4. The ice storage tank for storing sherbet-like ice from the ice making machine is provided directly below the air cooling, and a cooling pipe of the air cooler is arranged vertically so as to communicate with the ice storage tank nourishing section. An intake-air cooling device for ice heat storage of a gas turbine according to claim 1, wherein: 5. Between the air cooler and the ice storage tank,
The intake heat cooling device for ice heat utilization of a gas turbine according to any one of claims 1 to 4, further comprising a piping device for forcedly circulating cooling water or a mixture of cooling water and sherbet-like ice. 6. Between the air cooler and the ice storage tank,
A pipe device forming a bypass flow path for forcibly circulating cooling water or a mixture of cooling water and sherbet-shaped ice is provided, and intake heat cooling using ice heat storage for a gas turbine according to claim 1 to claim 5. apparatus. 7. A temperature sensor for detecting a temperature of a cooling portion is provided in the cooler, and one or both of the circulation piping device and the piping device for forming a bypass flow passage are provided at a cooling pipe inlet temperature control valve. Is controlled by a temperature control device using the output of the temperature sensor as a control input. 8. An intake passage switching means for setting an intake passage to either a passage passing through an air cooler or a passage bypassing the air cooler. An intake air cooling device for ice heat storage of a gas turbine according to claim 1. 9. The intake-cooling system for ice-heat storage utilizing intake air for a gas turbine according to claim 1, wherein the cooling pipe is arranged in a cooler so as to be inclined with respect to the horizontal. 10. An intake-air cooling system using ice heat storage for a gas turbine according to claim 1, wherein the cooling pipe is arranged vertically in the cooler. 11. An intake air using ice heat storage of a gas turbine according to claim 1, wherein the cooling pipe of the air cooler is provided with leads and cooling fins having a multiplier corresponding to an arrangement angle thereof. Cooling system. 12. The intake-cooling device for ice storage utilizing ice storage of a gas turbine according to claim 1, wherein the gas turbine constitutes a gas / steam combined cycle.