JP5523881B2 - Gas turbine intake air cooling system - Google Patents

Description

  The present invention relates to a gas turbine intake air cooling device that increases the output by cooling air sucked in a gas turbine.

  For example, in a combined cycle plant in which a gas turbine facility alone or a gas turbine facility applied to a thermal power plant is combined with a steam turbine facility and an exhaust heat recovery boiler, increasing power generation efficiency is an important issue.

  As one means for increasing the power generation efficiency, an intake air cooling device that increases the intake flow rate of the compressor by cooling the intake air supplied to the compressor is known. The intake air cooling device cools intake air by injecting water into the intake air to vaporize water in the intake air chamber or the compressor that sucks air.

  Conventionally, Patent Document 1 discloses that when water is sprayed into the intake air, the particle size of the droplets is further reduced to reliably cool the air, thereby increasing output and preventing damage to each blade of the compressor. An intake air cooling device is disclosed. In particular, the intake air cooling device of Patent Document 1 includes a spray device configured with a plurality of water conduits and nozzles, and a plurality of cooling water supply pipes connected to the spray device, so that more spray water can be used. Air is reliably cooled and the output of the gas turbine is increased.

JP 2002-322916 A

  For the intake air cooling device, it is required to make the particle size of water droplets sprayed into the intake chamber as small as possible. This is because, when the particle size of the water droplet is large, the water droplet directly collides with the moving and stationary blades of the compressor to generate erosion and damage the moving and stationary blades. Therefore, a method of spraying water droplets with a small particle diameter by using a positive displacement pump capable of injecting cooling water at a high pressure in an intake air cooling device is known.

  Here, it is conceivable to apply this positive displacement pump to a plurality of cooling water supply pipes of the intake air cooling device of Patent Document 1 described above. However, the positive displacement pump may cause pressure pulsation in the suction side and discharge side piping due to its structure. In particular, in an intake air cooling device in which a positive displacement pump is disposed in each of a plurality of cooling water supply pipes in order to suitably control droplets, pressure pulsations in these pipes may interfere with each other and increase. Eventually, mechanical vibrations of peripheral equipment such as pumps and pipes may be increased, leading to damage.

  The present invention has been made in consideration of such circumstances, and a gas turbine intake air cooling device that can improve the reliability of the entire system even when a plurality of pumps are provided in individual piping systems. The purpose is to provide.

In order to solve the above-described problems, a gas turbine intake air cooling device according to the present invention sprays cooling water on the intake air led to a compressor of a gas turbine facility and cools it, and the spray device includes the cooling water. A cooling water supply system for supplying water, and the cooling water supply system is connected to at least one tank for storing the cooling water independently from the tank, and supplies the cooling water to the spraying device. wherein a plurality of supply pipes, a pump disposed in each said supply pipe, that and a secondary pipe connected to the water supply tank is branched from the discharge side of the pump of the supply pipe to It is what.

  According to the gas turbine intake air cooling device of the present invention, the reliability of the entire system can be improved even when a plurality of pumps are provided in individual piping systems.

1 is a schematic system diagram showing a first embodiment of a gas turbine intake air cooling device according to the present invention. The schematic system diagram which shows the modification of 1st embodiment of the gas turbine intake-air-cooling apparatus which concerns on this invention. The schematic system diagram which shows the other modification of 1st embodiment of the gas turbine intake-air-cooling apparatus which concerns on this invention. The schematic system diagram which shows 2nd embodiment of the gas turbine intake-air-cooling apparatus which concerns on this invention. The schematic system diagram which shows 3rd embodiment of the gas turbine intake-air-cooling apparatus which concerns on this invention.

  Embodiments of a gas turbine intake air cooling device according to the present invention will be described with reference to the accompanying drawings.

[First embodiment]
FIG. 1 is a schematic system diagram showing a first embodiment of a gas turbine intake air cooling device according to the present invention.

  The gas turbine equipment 1 to which the gas turbine intake cooling device in the present embodiment is applied mainly includes an intake chamber 3, a compressor 5, a gas turbine 6, and a generator 7 along the flow of fluid.

  The intake chamber 3 is connected to the compressor 5 and takes in the intake air (intake air) supplied to the compressor 5 from the intake inlet 4. Note that the description will be made by applying an example in which the gas supplied to the compressor 5 is air, but the gas supplied to the compressor 5 is not limited to air and may be other gases.

  The compressor 5 compresses the air supplied from the intake chamber 3 and discharges it to the combustor 8. The discharged compressed air is supplied to the combustor 8 together with the fuel 9, and combustion gas is generated. The gas turbine 6 is driven by the combustion gas generated by the combustor 8. Further, the exhaust 10 discharged from the gas turbine 6 is discharged into the atmosphere. The generator 7 is connected to the turbine shaft of the gas turbine 6 and generates electricity as the gas turbine 6 is driven.

  The gas turbine equipment 1 includes a thermometer, a hygrometer, and an air flow rate detector (all not shown) at predetermined positions. The thermometer detects the atmospheric temperature, the hygrometer detects the humidity of the intake chamber 3, and the air flow rate detector detects the flow rate of air supplied to the compressor 5.

  In the intake chamber 3, a spray device 11 for spraying cooling water and cooling the intake air introduced into the intake chamber 3 is disposed. The spraying device 11 includes nozzles 13a, 13b,... 13n (nozzles 13) provided in a plurality of water conduits 12a, 12b,. ) More fine droplets are sprayed. An example in which the droplet sprayed on the air supplied to the compressor 5 is water will be described. However, the liquid is not limited to water and may be another liquid.

  The spraying device 11 is connected to a cooling water supply system 20 that supplies cooling water. The cooling water supply system 20 includes a tank 22 that stores cooling water and is opened to the atmosphere, and supply pipes 23a, 23b,... 23n (supply pipes 23) that are independently connected to the tank 22. . In addition, pumps 28a, 28b... 28n (pump 28), pressure control valves 29a, 29b... 29n (pressure control valve 29) and accumulators 31a, 31b. ) Is arranged.

  The tank 22 stores the cooling water 21 supplied from a pure water system or an irrigation system (both not shown). The capacity of the tank 22 preferably corresponds to the discharge amount when the pump 28 discharges for 2 minutes or more (for example, 2 to 10 minutes) at the maximum discharge flow rate. This is because the cooling water can be supplied smoothly without causing air turbidity to the pump 28 in operation.

  The supply piping 23 is a steel pipe, for example, and two or more systems are provided. The suction side supply pipes 24 a, 24 b... 24 n (suction side supply pipe 24) that are the suction side of the pump 28 of the supply pipe 23 are independently connected to the tank 22. In addition, discharge side supply pipes 25 a, 25 b... 25 n (discharge side supply pipes 25) which are discharge sides of the pump 28 of the supply pipe 23 are respectively connected to the water conduits 12 provided according to the number of systems of the supply pipes 23. Connected.

  As the pump 28, a positive displacement pump capable of injecting cooling water at a high pressure is used in order to reduce the particle size of droplets sprayed from the spray device 11. The positive displacement pump is a pump of a type that pushes liquid from the suction side to the discharge side by movement or change of the sealed space generated between the casing and a movable member inscribed in the casing.

  The pressure control valve 29 is a spring-type valve that operates in the opening direction when the pressure on the discharge side of the pump 28 exceeds a predetermined value. The pressure control valve 29 is provided to control the pressure on the discharge side of the pump 28, that is, the pre-pressure of the nozzle 13 at a constant level. The pressure control valve 29 is connected on the discharge side supply pipe 25. Further, the secondary side pipes 30a, 30b... 30n (secondary side pipes 30) of the pressure control valve 29 are connected to the tank 22 and opened to the atmosphere.

  The accumulator 31 (air chamber) is provided to absorb pressure pulsation generated by the operation of the pump 28. The accumulator 31 is disposed in the discharge side supply pipe 25 or the discharge casing (not shown) of the pump 28. The accumulator 31 is preferably installed as close to the pump 28 as possible.

  The operation of the cooling water supply system 20 and the spray device 11 as the gas turbine intake air cooling device in the first embodiment will be described.

  The droplets sprayed from the nozzle 13 of the spraying device 11 are supplied to the air sucked into the suction chamber 3 from the suction inlet 4. The cooling water supply system 20 pumps the cooling water stored in the tank 22 with a pump 28 and supplies the cooling water to the spraying device 11. At this time, the cooling water supply system 20 includes, for example, the flow rate of the cooling water supplied to the spraying device 11, the atmospheric temperature detected by the above-described thermometer, hygrometer, and air flow detector, the humidity of the intake chamber 3, the compressor In accordance with the air flow rate supplied to 5, the cooling water is supplied to the spraying device 11 after performing control so that the cooling water supply amount is optimized.

  Here, the positive displacement pump applied to the pump 28 may cause pressure pulsation in the suction side and discharge side piping due to its structure.

  On the other hand, in the cooling water supply system 20 in the present embodiment, the suction side supply pipes 24 of the plurality of supply pipes 23 in which the pumps 28 are arranged are independently connected to the tank 22, and the suction side of the pump 28 is connected to the tank. 22 was opened to the atmosphere. For this reason, it is possible to reduce the mutual interference of the pressure pulsations of the suction side supply pipes 24 that are generated by the simultaneous operation of the plurality of pumps 28.

  On the other hand, an accumulator 31 is disposed in the discharge casing or the discharge-side supply pipe 25 of the pump 28. For this reason, the pressure pulsation of the discharge side supply piping 25 located in the pump 28 discharge side is reduced.

  A pressure control valve 29 is further connected to the discharge side supply pipe 25 of the pump 28. The pressure control valve 29 operates when the pressure of the discharge side supply pipe 25 becomes a certain value or more, and suppresses the fluctuation of the discharge side pressure of the pump 28. For this reason, the pressure pulsation of the discharge side supply piping 25 is reduced. Further, the secondary side pipe 30 of the pressure control valve 29 is opened to the atmosphere via the tank 22. The operation of the pressure control valve 29 can be stabilized by stabilizing the secondary pressure (back pressure). Accordingly, the pressure control of the discharge side supply pipe 25 is also suitably performed. In addition, since the secondary side piping 30 of the pressure control valve 29 is connected to the tank 22, the remaining water of the pressure control valve 29 is returned to the tank 22 and used again as cooling water.

  Further, the pressure regulating valve 29 regulates the discharge side pressure of the pump 28, so that the pre-pressure of the nozzle 13 is stabilized. For this reason, a fine state is maintained also about the particle size of the droplet sprayed from the spraying apparatus 11, and the erosion of the compressor 5 moving and stationary blade accompanying the collision of a droplet is prevented.

  According to the gas turbine intake air cooling device in the present embodiment, even when a plurality of pumps 28 are arranged and operated simultaneously, pressure pulsations in the supply pipes 23 on the suction side and the discharge side of the pumps 28 are suitably suppressed. be able to. Further, along with the reduction of pressure pulsation, mechanical vibrations of peripheral devices such as pumps and piping can be reduced. For this reason, the reliability of the whole gas turbine intake air cooling device using a plurality of positive displacement pumps in the cooling water supply system 20 can be improved.

  In the present embodiment, the gas turbine intake air cooling device in which a plurality of supply pipes 23 in which a plurality of pumps 28 are arranged is independently connected to one tank 22 has been described. However, the number of tanks 22 is not limited to one, and a plurality of tanks 22 may be provided.

  FIG. 2 is a schematic system diagram showing a modification of the first embodiment of the gas turbine intake air cooling device according to the present invention.

  In FIG. 2, a plurality of tanks 32 are provided in accordance with the number of supply pipes 23 so that one tank 32 a, 32 b... 32 n (tank 32) is connected to one supply pipe 23 of the cooling water supply system 35. An example in which the number is provided is shown. By providing the tank 32 for each supply pipe 23 in this way, the mutual interference of pressure pulsations in the supply pipe 23 can be more suitably suppressed.

  By providing the tank 32 for each supply pipe 23 in this manner, the degree of freedom of arrangement of the tank 32 is increased, and the distance between the pump 28 and the tank 32 arranged in the supply pipe 23 and the head 32 is set to a position where the head can be reduced. It is possible. Therefore, the loss of the pipe length of the suction side supply pipe 24 of the supply pipe 23 that causes the pressure pulsation can be suppressed.

  In the present embodiment, the example in which the pressure control valve 29 and the accumulator 31 are provided in the supply pipe 23 has been described. However, in the gas turbine intake air cooling device, it is only necessary that the supply pipes 23 are independently connected to the tank 22, and the pressure control valve 29 and the accumulator 31 may be provided in the supply pipe 23 as necessary.

  In the above-described gas turbine intake air cooling device, the example in which the spray device 11 is provided in the intake chamber 3 has been described. However, the spray device 11 can also cool the intake air outside the intake chamber 3 and in the vicinity of the intake inlet 4.

  FIG. 3 is a schematic system diagram showing another modification of the first embodiment of the gas turbine intake air cooling device according to the present invention.

  .. 112n (water guide pipe 112) of the gas turbine intake air cooling device shown in FIG. 3 is in the vicinity of the intake inlet 4 and substantially perpendicular to the flow direction of the intake air led to the intake chamber 3. Arranged along the cross section. Further, the water conduit 112 is also arranged on the side surface of the intake inlet 4 so that the intake air guided from the side surface of the intake inlet 4 can also be cooled. These water conduits 112 are provided with spray nozzles 113a, 113b,... 113n, respectively.

  By providing the spray device 111 outside the intake chamber 3 to cool the intake air, it is possible to eliminate work such as drilling necessary for providing the spray device 111 in the intake chamber 3, and further, a gas turbine cooling device The construction period for installation can be shortened.

  In addition, since the spray device 111 is disposed outside the filter provided at the intake port 4, the occurrence of erosion in the compressor 5 due to water droplets can be suppressed.

[Second Embodiment]
FIG. 4 is a schematic system diagram showing a second embodiment of the gas turbine intake air cooling device according to the present invention.

  The main difference of the gas turbine intake air cooling device described in the second embodiment from the first embodiment is that the supply pipes 23a, 23b,... 23n (supply pipe 23) of the cooling water supply system 40 are unloaded valves. 41a, 41b,... 41n (unload valve 41) are connected. In addition, about the structure and part corresponding to 1st embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted. Although the cooling water supply system 40 shown in FIG. 4 demonstrates the example which does not provide the pressure regulation valve 29 and the accumulator 31 which were shown in FIG. 1 mentioned above, you may provide as needed.

  The unload valve 41 operates when the pumps 28a, 28b,..., 28n (pump 28) are started and stopped. When the pressure on the discharge side of the pump 28 reaches a predetermined value, the pump 28 is operated in a no-load state. It is a pressure control valve. The unload valve 41 is connected to the discharge side supply pipes 25a, 25b,... 25n (discharge side supply pipe 25) of the supply pipe 23. Moreover, the secondary side piping 42a, 42b ... 42n (secondary side piping 42) of the unloading valve 41 is connected to the tank 22, respectively.

  The operation of the cooling water supply system 40 of the gas turbine intake air cooling device in the second embodiment will be described.

  When the pump 28 is activated when the gas turbine intake air cooling device is activated, the unload valve 41 is opened. Normally, when the pump 28 is rapidly activated, a load is applied to the pump 28. However, in the gas turbine intake air cooling device in the present embodiment, the unload valve 41 is arranged on the discharge side of the pump 28. For this reason, the load concerning the pump 28 can be reduced. In addition, since the pump 28 can be operated without load at the time of startup, it is possible to perform a break-in operation and to release the air from the system. For this reason, the cooling water supply system 40 can suitably suppress the occurrence of abnormal fluid vibration due to air entrainment.

  Since the pump 28 shifts to the rated operation state, the unload valve 41 is closed, and the discharge side pressure of the pump 28 increases.

  On the other hand, when the pump 28 is shifted from the rated operation state to the stop state, the unload valve 41 is opened. As in the case of the rapid start, the pump 28 is loaded even in the case of a sudden stop. However, by operating the unload valve 41, the pump 28 can be stopped in an unloaded state. For this reason, the pump 28 is not suddenly stopped, and the load applied to the pump 28 can be reduced. Further, since the secondary side pipe 42 of the unload valve 41 is connected to the tank 22, the cooling water flowing into the unload valve 41 is returned to the tank 22 again. This is effective in that the cooling water flowing through the unload valve 41 can be reused and the operating cost can be reduced.

  According to the gas turbine intake air cooling device in the present embodiment, in addition to the effects exhibited in the first embodiment, the load on the pump 28 can be reduced when the gas turbine intake air cooling device is started and stopped. For this reason, the reliability of the whole gas turbine intake-air cooling apparatus including the time of starting and stopping can be improved.

[Third embodiment]
FIG. 5 is a schematic system diagram showing a third embodiment of the gas turbine intake air cooling device according to the present invention.

  The main difference of the gas turbine intake air cooling device described in the third embodiment from the first embodiment is that a part of the supply pipes 53a, 53b,... 53n (supply pipe 53) of the cooling water supply system 50 is not. This is a point made of a metal material. Since other configurations are substantially the same as those in the first embodiment, corresponding configurations and portions are denoted by the same reference numerals, and redundant description is omitted. In addition, although the cooling water supply system 50 shown in FIG. 5 demonstrates the example which does not provide the pressure control valve 29 and the accumulator 31 shown in FIG. 1, and the unload valve 41 shown in FIG. 4, you may provide as needed. .

  The suction side supply pipes 54a, 54b,... 54n (suction side supply pipe 54) of the supply pipe 53 are a part of the suction side hoses 64a, 64b,... 64n (suction side hose 64) made of a non-metallic material. Prepare for. The discharge side supply pipes 55a, 55b,... 55n (discharge side supply pipe 55) of the supply pipe 53 are part of the discharge side hoses 65a, 65b,... 65n (discharge side hose 65) made of a non-metallic material. Prepare for.

  The suction-side hose 64 and the discharge-side hose 65 are made of a non-metallic material that is less rigid than the supply pipe 53, such as rubber or plastic. The discharge side hose 65 is a high pressure hose that can withstand the pressure on the discharge side of the pump 28.

  The operation of the cooling water supply system 50 of the gas turbine intake air cooling device in the third embodiment will be described.

  The suction side supply pipe 54 connected to the suction side of the pump 28 includes a suction side hose 64 in a part thereof. The suction side hose 64 is less rigid than the suction side supply pipe 54 and functions as a damper against pressure pulsations generated in the suction side supply pipe 54 on the pump 28 suction side. As a result, pressure pulsation on the suction side of the pump 28 is reduced, and transmission of mechanical vibrations to peripheral devices is suppressed.

  Similarly, the discharge side supply pipe 55 is provided with a discharge side hose 65 in a part thereof. For this reason, pulsation on the discharge side of the pump 28 is reduced, and transmission of mechanical vibrations to peripheral devices is suppressed.

  According to the gas turbine intake air cooling device in the present embodiment, in addition to the effects exhibited in the first embodiment, the pressure pulsation in the supply pipe 53 can be more suitably reduced. As a result, mechanical vibrations of peripheral equipment can be suppressed, and the reliability of the entire gas turbine intake air cooling device can be improved.

  In addition, 1st-3rd embodiment shows the feature point, respectively, It can implement by combining the structure of 1st-3rd embodiment as needed. In particular, the configuration example in which the spray device 111 described in FIG. 3 is provided outside the intake chamber 3 can also be applied to the gas turbine intake air cooling device in the second and third embodiments.

DESCRIPTION OF SYMBOLS 1 Gas turbine equipment 3 Intake chamber 4 Intake inlet 5 Compressor 6 Gas turbine 7 Generator 8 Combustor 11, 111 Spraying device 12a, 12b ... 12n (12), 112a, 112b ... 112n (112) 13a, 13b ... 13n (13), 113a, 113b ... 113n (113) Nozzle 20 Cooling water supply system 22 Tanks 23a, 23b ... 23n (23) Supply piping 24a, 24b ... 24n (24) ) Suction side supply piping 25a, 25b ... 25n (25) Discharge side supply piping 28a, 28b ... 28n (28) Pumps 29a, 29b ... 29n (29) Pressure regulating valves 30a, 30b ... 30n (30) Secondary piping 31a, 31b ... 31n (31) Accumulator 32a, 32b ... 32n (32) Tank 40 Cooling water Supply system 41a, 41b ... 41n (41) Unload valve 42a, 42b ... 42n (42) Secondary side piping 50 Cooling water supply system 53a, 53b ... 53n (53) Supply piping 54a, 54b .... 54n (54) Suction side supply piping 55a, 55b ... 55n (55) Discharge side supply piping 64a, 64b ... 64n (64) Suction side hose 65a, 65b ... 65n (65) Discharge side hose

Claims (5)

A spraying device for spraying and cooling cooling water on the intake air led to the compressor of the gas turbine equipment;
A cooling water supply system for supplying the cooling water to the spray device;
The cooling water supply system is
At least one tank for storing the cooling water;
A plurality of supply pipes connected independently to the tank and supplying the cooling water to the spray device;
A pump in which each of the supply pipes is disposed ;
A gas turbine intake air cooling apparatus comprising: a secondary side pipe branched from the discharge side of the pump of each of the supply pipes and connected to the water supply tank . The tank, the supply is provided in accordance with the number of pipe, one of the supply pipe gas turbine intake air cooling apparatus of claim 1, wherein one tank is connected to. The supply pipe of the suction side and the discharge side of the pump, the gas turbine intake air cooling apparatus according the supply pipe of the other of the supply pipe which is formed by material having low rigidity than the part to claim 1 or 2 comprising respectively . The gas turbine intake air cooling device according to any one of claims 1 to 3, wherein the secondary side pipe is provided with at least one of an unload valve and a pressure regulating valve that act when the pump is started and stopped . The gas turbine intake air cooling device according to any one of claims 1 to 4 , further comprising an accumulator disposed on a discharge side of the pump.

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