JP4812706B2 - Gas turbine intake system - Google Patents

Description

  The present invention relates to a gas turbine intake device that takes in air for operating gas turbine equipment.

  A gas turbine intake device for taking in air from the atmosphere is installed in the gas turbine equipment. In general, a gas turbine intake device supplies intake air to a compressor via an intake duct, and an intake silencer (in order to reduce high-frequency noise generated in the compressor) A plurality of silencers are provided.

  As a technology related to the structure near the intake duct and the intake silencer, the intake silencer and the compartment chamber in the intake duct are connected by piping, and hot air used for ventilation of the compartment chamber is connected to the intake duct through a hole provided in the connection portion. Some of them are released (see Patent Document 1, etc.).

Japanese Utility Model Publication No. 5-89848

  By the way, the above-described technology increases the temperature of the intake air by supplying warm air, and suppresses the formation of icing at the gas turbine inlet during the operation of the gas turbine. Thereafter, the turbine atmosphere that has flowed back to the intake duct is cooled, and the surface of the intake silencer may condense and cause rust. The rust generated in this manner not only deteriorates the intake silencer but also may peel off and damage the gas turbine, which is a problem for stable operation of the gas turbine equipment. In addition, when a parallel baffle type silencer with a narrower interval between intake silencers (for example, about 100 to 200 mm) and an improved silencing effect is adopted, work space cannot be secured, so rust removal and maintenance Work becomes difficult.

  An object of the present invention is to provide a gas turbine intake device that suppresses the occurrence of condensation on the intake silencer while the gas turbine equipment is stopped.

In order to achieve the above object, the present invention provides a gas turbine intake device that takes in air for operating gas turbine equipment, an intake duct through which air taken in from the atmosphere through an intake chamber flows, and an inside of the intake duct It comprises an intake silencer provided a supply pipe warm air during stop of the gas turbine system is supplied, is provided so as to pass through the inside of the intake silencer, and a warm air path connected to the supply pipe to the .

  According to the present invention, since condensation of the intake silencer can be suppressed and dry keeping can be performed while the gas turbine equipment is stopped, the occurrence of rust on the intake silencer can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of a gas turbine facility having a gas turbine intake device according to a first embodiment of the present invention, and FIG. 2 is a structural diagram of the gas turbine intake device according to the first embodiment of the present invention. It is.

  The gas turbine equipment shown in FIG. 1 includes a gas turbine intake device 1, a compressor 2, a combustor 3, a gas turbine 4, an exhaust duct 5, and a compartment chamber 6. The exhaust duct 5 is for the exhaust gas from the gas turbine 4 to circulate. The compartment chamber 6 mainly stores the compressor 2, the combustor 3, and the gas turbine 4, and takes in outside air for ventilating indoor air. The outside air taken into the compartment 6 is exchanged with heat generated from the gas turbine 4 or the like to be heated and discharged outside.

  1 and 2, a gas turbine intake device (hereinafter referred to as an intake device) 1 is for taking in air for operating gas turbine equipment, and includes an intake chamber 11, an intake duct 12, an intake silencer 13, and the like. A hot air supply pipe (hereinafter referred to as supply pipe) 14 through which hot air flows, a hot air discharge pipe (hereinafter referred to as discharge pipe) 15, a supply flow rate adjustment valve 16 attached to the supply pipe 14, and a discharge pipe 15 are provided. An attached discharge flow rate adjusting valve 17 is provided.

  The intake chamber 11 is a portion where air is taken from the atmosphere, and an intake filter (not shown) for removing foreign matter in the intake air is provided in the intake chamber 11. The intake duct 12 circulates air taken from the atmosphere through the intake chamber 11, and connects the intake chamber 11 and the compressor 2. A sound absorbing material 23 is filled between the inner wall 21 and the outer wall 22 of the intake duct 12 to suppress leakage of sound in the intake duct 12 to the outside.

  The intake silencer 13 mainly reduces high-frequency sound generated in the compressor 2, and a plurality of intake silencers 13 are provided in the width direction of the intake duct 12 in a predetermined section in the intake duct 12 (note that FIG. 2 is simplified). Only some of the intake silencers 13 are shown). The intake silencer 13 of the present embodiment is a so-called parallel baffle type silencer that can efficiently reduce high-frequency sound, and a plurality of intake silencers 13 are provided at predetermined intervals (for example, about 100 to 200 mm) along the width direction of the intake duct 12. Has been placed.

  3 is a cross-sectional view of the intake silencer 13 taken along the line III-III in FIG. In addition, the same code | symbol is attached | subjected to the same part as the previous figure, and description is abbreviate | omitted (following figure is handled similarly).

  In this figure, the intake silencer 13 includes an outer panel 32a, 32b provided with a plurality of holes 31, and an inner panel provided with a plurality of holes 34 formed therein with a flow path 33 of hot air from the supply pipe 14. 35a, 35b, and a sound absorbing material (for example, glass wool board) 36 filled between the outer panels 32a, 32b and the inner panels 35a, 35b.

  The outer panels 32 a and 32 b form the outer wall of the intake silencer 13 and are fixed to the inner wall 21 of the intake duct 12 via a fixture 42. Note that the fixture 42 in the present embodiment is an L-shaped fixture. The plurality of holes 31 on the external panels 32 a and 32 b not only exhibit a silencing effect, but also function as hot air discharge holes from the hot air flow path 33.

  The inner panels 35a and 35b are two panels arranged in the intake silencer 13 (that is, between the outer panels 32a and 32b) with a space therebetween, and form a hot air flow path 33. That is, the hot air flow path 33 is formed substantially parallel to the external panels 32a and 32b. The plurality of holes 34 on the inner panels 35a and 35b act as hot air inflow holes from the hot air flow path 33, and the hot air is introduced into the sound absorbing material 36 through the holes 34. When a plate-like member such as glass wool board is used as the sound absorbing material 36, the hot air flow path 33 can be formed by the sound absorbing material 36. For example, the sound absorbing material 36 is fixed with a wire or the like and the hot air flow path 33 is fixed. 33 may be secured and the inner panels 35a and 35b may be omitted.

  A supply hole 37 for supplying warm air to the inside of the intake silencer 13 is provided in the upper part of the intake silencer 13 (that is, above the warm air flow path 33). On the other hand, a discharge hole 38 through which the warm air that has passed through the intake silencer 13 is discharged is provided below the intake silencer 13 (that is, below the warm air flow path 33). In the present embodiment, two supply holes 37 are provided for one intake silencer 13, and only one discharge hole 38 is provided for all intake silencers 13. The numbers of supply holes 37 and discharge holes 38 are not limited to these, and may be increased or decreased as appropriate. For example, if each intake silencer 13 is provided with a discharge hole 38 and connected to the discharge pipe 15 so as to join downstream, the air permeability in each intake silencer 13 is improved, so that dehumidification can be performed efficiently. Can do.

  The supply pipe 14 supplies hot air to the hot air flow path 33 of the intake silencer 13 when the gas turbine equipment is stopped, and is connected to a hot air supply source on the upstream side. The supply pipe 14 includes a supply flow rate adjustment valve 16 that adjusts the flow rate of the hot air supplied to the hot air flow path 33, and a header portion 39 that is attached to the downstream side of the flow rate adjustment valve 16. The supply pipe 14 first branches at the header portion 39 according to the number of intake silencers 13, and then further branches according to the number of supply holes 37 of each intake silencer (two in this embodiment) to supply holes. 37. Further, the supply pipe 14 is preferably attached in parallel with the hot air flow path 33 in the vicinity of the supply hole 37 as in the present embodiment. Thereby, since the warm air parallel to the warm air flow path 33 is supplied into the intake silencer 13, it is possible to spread the warm air uniformly in the intake silencer 13.

  In addition, as the warm air supplied to the intake silencer 13, it is preferable to use warm exhaust generated by ventilation of the compartment chamber 6. This is because if the air heated by the heat radiation of the gas turbine equipment is used, it is not necessary to heat the air separately and the energy efficiency is good. In order to use the ventilation of the compartment chamber 6, for example, the upstream side of the supply pipe 14 is connected to the compartment chamber 6, and warm exhaust from the compartment chamber 6 is supplied to the intake silencer 13 by a ventilation fan (not shown). (Refer to a second embodiment (FIG. 4) described later).

  The discharge pipe 15 discharges the warm air that has passed through the warm air flow path 33 to the outside of the intake silencer 13, and is connected to the discharge hole 38 of the intake silencer 13. A discharge flow rate adjustment valve 17 that adjusts the flow rate of hot air is provided downstream of the discharge hole 38, and an outlet on the downstream side of the flow rate adjustment valve 17 is open to the atmosphere. As described above, the number of the discharge holes 38 of the intake silencer 13 may be increased, and the discharge holes 38 and the discharge pipes 15 may be connected via headers.

  The flow rate adjustment valve 16 and the flow rate adjustment valve 17 are closed when the gas turbine equipment is operating, so that warm air is not supplied into the intake silencer 13. On the other hand, when the gas turbine equipment is stopped, the flow rate adjustment valve 16 and the flow rate adjustment valve 17 are opened, and hot air is introduced into the hot air flow path 33 in the intake silencer 13. As the flow rate adjusting valve 16 and the flow rate adjusting valve 17, a flow rate adjusting means such as a damper may be used in addition to the manual valve and the automatic valve.

  Next, operation | movement of the gas turbine intake device of this Embodiment is demonstrated.

  In the gas turbine intake device configured as described above, when the operation of the gas turbine equipment is stopped, the flow rate adjustment valves 16 and 17 that have been closed are opened, and the intake silencer 13 is supplied via the supply pipe 14. Send warm air inside. The warm air sent into the intake silencer 13 passes through the warm air flow path 33 mainly toward the discharge hole 38 and is discharged from the discharge pipe 15 (see arrow 44 in FIG. 3). Further, when a part of the warm air passes through the warm air flow path 33, it flows into the sound absorbing material 36 through the holes 34 of the inner panels 35a and 35b, and is sucked through the holes 31 of the outer panels 32a and 32b. It is discharged into the duct 12 (see arrow 45 in FIG. 3). When the warm air flows through the intake silencer 13 in this way, the inner panels 35a and 35b, the sound absorbing material 36, the outer panels 32a and 32b of the intake silencer 13, the sound absorbing material 23 of the intake duct 12, and the like are heated to dry the moisture. The As a result, when the gas turbine equipment stops and the turbine atmosphere containing moisture flows backward, or due to atmospheric conditions, the sound absorbing materials 23 and 36 filled in the intake duct 12 and the intake silencer 13 become high humidity. Even in the case, the occurrence of condensation near the intake silencer 13 and the intake duct 12 is suppressed, so that the intake silencer 13 and the surrounding intake duct 12 can be kept dry.

  Next, effects of the present embodiment will be described with reference to related technologies.

  Regarding the configuration near the intake duct and the intake silencer, as a technology related to the present embodiment, the intake silencer in the intake duct and the compartment chamber are connected by piping, and the compartment chamber is used for ventilation from the hole provided in the connection portion. There is one that discharges warm air into the intake duct (see Patent Document 1). This technology increases the temperature of the intake air by supplying warm air into the intake duct, and suppresses the formation of icing at the gas turbine inlet while the gas turbine equipment is operating. is there.

  However, with this technology, after the gas turbine facility is shut down, the sound absorbing material filled in the intake duct and the intake silencer becomes high humidity due to atmospheric conditions, etc., or the turbine atmosphere is cooled by flowing back into the intake duct. As a result, the intake silencer may condense and cause rust. The rust generated in this manner not only deteriorates the intake silencer but may peel off and damage the gas turbine, which has been a problem in stable operation of the gas turbine equipment. In addition, when a parallel baffle type silencer having a narrow interval between the intake silencers is employed, a work space cannot be secured, so that rust removal and maintenance work are difficult.

  On the other hand, the gas turbine intake device of the present embodiment has a warm air flow path 33 formed between the sound absorbing materials 36 inside, an intake silencer 13 provided in the intake duct 12, and an intake silencer 13. And a supply pipe 14 for supplying hot air to the hot air passage 33 when the gas turbine equipment is stopped. According to the intake device configured in this way, when the gas turbine equipment is stopped, the warm air is sent into the intake silencer 13 using the supply pipe 14, so that the sound absorbing material 36 in the intake silencer 13, etc. Can be exposed to warm air. As a result, moisture (humidity) adhering to the outer panels 32a and 32b, the inner panels 35a and 35b, the sound absorbing material 36, and the like of the intake silencer 13 is dried, and condensation of the intake silencer 13 can be suppressed and dry keeping can be performed. The silencer can be prevented from generating rust. Therefore, according to the present embodiment, it is possible to suppress deterioration of the intake silencer 13 and damage to the gas turbine equipment due to rust.

Next, a second embodiment of the present invention will be described.
FIG. 4 is a schematic view of a gas turbine facility having a gas turbine intake device according to a second embodiment of the present invention.

  The gas turbine intake device 1A shown in this figure is different from that of the first embodiment in that it includes a supply pipe 14A connected to the compartment chamber 6, a ventilation fan 51, and a heating device 52. is there.

  The supply pipe 14 </ b> A supplies warm exhaust generated by ventilation of the compartment chamber 6 to the intake silencer 13, and connects the compartment chamber 6 and the intake silencer 13. A ventilation fan 51 and a heating device 52 are attached to the supply pipe 14A. The ventilation fan 51 blows air (warm exhaust) in the compartment chamber 6 toward the intake silencer 13, and the heating device 52 heats the air inside the supply pipe 14A.

  As a heat source when the air in the supply pipe 14A is heated by the heating device 52, for example, electricity, steam, hot water, hydraulic oil used in gas turbine equipment, exhaust gas from gas turbine equipment, solar heat, or the like is used. can do.

  As a specific technique of using steam as a heat source of the heating device 52, for example, there is a technique using auxiliary steam of a thermal power plant facility having a multi-shaft configuration. In this case, a plurality of combined cycles having the gas turbine equipment of this embodiment are provided side by side, and when some combined cycles are stopped, low-temperature reheated steam of the steam turbine and backup for when the plant is under low load An auxiliary steam header into which the boiler steam is introduced may be provided as equipment common to the plant. If such a plant is configured, the auxiliary steam can be supplied to the heating device 52 from the other operating cycles through the auxiliary steam header even if some of the cycles are stopped. The air from the compartment 6 can be heated even after the equipment is stopped.

  Moreover, as another technique using steam, there is one using a thermal power plant facility in which an exhaust heat recovery boiler auxiliary combustion device is installed. In this type of plant, since the exhaust heat recovery boiler and the gas turbine equipment can be operated independently by the auxiliary combustion device, the steam generated from the exhaust heat recovery boiler is used as the heat source of the heating device 52 even when the gas turbine equipment is stopped. Because it can be done.

  According to the gas turbine intake device configured as described above, the air supplied to the intake silencer 13 can be supplied even when exhaust at a sufficient temperature cannot be obtained from the compartment chamber 6 because the gas turbine equipment has been stopped for a long time. Heating can be performed using the heating device 52. Thereby, even when the heat radiation of the gas turbine equipment is reduced or when the atmosphere is used, warm air having a temperature suitable for dehumidification can be supplied to the intake silencer 13, so that the intake silencer 13 can always be kept dry. .

  By the way, as in the case of the second embodiment, another configuration in the case where exhaust at a sufficient temperature cannot be obtained from the compartment chamber 6 is as follows.

  FIG. 5 is an arrow view (direction V in FIG. 3) of the intake silencer provided in the gas turbine intake device according to the third embodiment of the present invention.

  The intake silencer 13B shown in this figure includes an external panel 32B having a heating wire 55 disposed on the surface thereof. The heating wire 55 is connected to a power source 57 via a lead wire 56. As the heating wire 55, for example, a nichrome wire or the like can be used. The heating wire 55 is preferably attached so that the external panel 32B can be heated uniformly. Therefore, the heating wire 55 in the present embodiment is arranged in a zigzag manner on the surface of the external panel 32B.

  When heating the external panel 32 </ b> B, the power supply 55 is operated to supply electricity from the power supply 57 to the heating wire 55 via the lead wire 56. When electricity is supplied to the heating wire 55 in this way, the heating wire 55 generates heat and the external panel 32B is heated. Therefore, even when hot air having a temperature suitable for dehumidification cannot be obtained from the supply pipe 14, the intake silencer 13B is provided. Can be kept dry. Therefore, according to the present embodiment as well, it is possible to suppress the condensation of the intake silencer 13B while the gas turbine equipment is stopped and to keep it dry, so that it is possible to suppress the occurrence of rust in the intake silencer 13B.

  The heating wire 55 according to the present embodiment may be attached to either the inner surface or the outer surface of the external panel 32B, or may be attached to both the inner surface and the outer surface. Of course, the heating wire 55 may be used not only for the outer panel 32B but also for the inner panels 35a and 35b of the intake silencer 13. Furthermore, the gas turbine intake device of the present embodiment may be applied as an auxiliary to the intake silencer 13 having the hot air flow path 33 therein as in the first and second embodiments described above. Of course, the present invention may be applied independently to an intake silencer that does not have the hot air flow path 33 therein.

  By the way, in the description of each of the above embodiments, the gas turbine intake device provided with the exhaust pipe 15 has been described as an example. However, even if the exhaust pipe 15 is omitted, condensation of the intake silencer 13 (13B) is caused. Can be suppressed. Even if the exhaust pipe 15 is omitted, the warm air supplied to the intake silencer 13 (13B) is discharged into the intake duct 12 through the holes in the inner panels 35a and 35b (35B) and the outer panels 32a and 32b. In this case, the intake silencer 13 is heated to contribute to the suppression of the occurrence of condensation.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic of the gas turbine equipment which has the gas turbine intake device which is the 1st Embodiment of this invention. 1 is a structural diagram of a gas turbine intake device according to a first embodiment of the present invention. Sectional drawing of the intake silencer in the III-III cross section in FIG. The schematic of the gas turbine installation which has the gas turbine intake device which is the 2nd Embodiment of this invention. The arrow line view of the intake silencer provided in the gas turbine intake device which is the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas turbine intake device 6 Compartment chamber 11 Intake chamber 12 Intake duct 13 Intake silencer 14 Supply piping 15 Exhaust piping 16 Supply flow rate adjustment valve 17 Exhaust flow rate adjustment valve 32 External panel 33 Hot air flow path 35 Internal panel 36 Sound absorbing material 51 Ventilation fan 52 Heating device 55 Heating wire 57 Power supply

Claims (9)

In a gas turbine intake device that takes in air for operating a gas turbine facility,
An intake duct through which air taken from the atmosphere through the intake chamber circulates;
An intake silencer provided in the intake duct;
Supply piping to which hot air is supplied when the gas turbine equipment is stopped ;
A gas turbine intake device comprising: a hot air flow path provided so as to pass through the intake silencer and connected to the supply pipe . The gas turbine intake device according to claim 1, wherein
A gas turbine intake device comprising: a discharge pipe that is connected to the hot air flow path and discharges hot air that has passed through the intake silencer to the outside of the intake silencer. The gas turbine intake device according to claim 1, wherein
The gas turbine intake device according to claim 1 , wherein the hot air flow path is a flow path formed between two plate-like members disposed in the intake silencer with a gap therebetween. The gas turbine intake device according to claim 1, wherein
The gas turbine intake device according to claim 1, wherein a supply flow rate adjusting means for adjusting a flow rate of the hot air supplied to the hot air flow path is provided in the supply pipe. The gas turbine intake device according to claim 1, wherein
A gas turbine intake device, wherein a heating device for heating air inside the piping is attached to the supply piping. The gas turbine intake device according to claim 1, wherein
A gas turbine intake system, wherein a heating wire connected to a power source is arranged on an outer surface of the intake silencer. The gas turbine intake device according to claim 1, wherein
The gas turbine intake device according to claim 1, wherein the hot air supplied from the supply pipe is warm exhaust generated by ventilation of a compartment chamber in which the gas turbine equipment is accommodated. The gas turbine intake device according to claim 4,
The gas turbine intake device according to claim 1, wherein the supply flow rate adjusting means is any one of a manual valve, an automatic valve, and a damper. The gas turbine intake device according to claim 5, wherein
The gas turbine intake device, wherein the heating device heats air in the supply pipe using electricity, steam, hot water, hydraulic oil, exhaust gas, or solar heat.

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