JP3059132B2 - Ventilation system inside the soundproof outer garment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art Gas turbines which are large and are used for business use generate large noises including a mixture of intake noise, combustion noise, exhaust noise, and rotation noise. As proposed in No. 321302 "Combined Structure of Gas Turbine Soundproof Outer Jacket and Piping Rack, etc.", a soundproof outer jacket is provided on the outer periphery of the casing of the gas turbine to reduce the diffusion of noise to the periphery. However, when such a soundproof outer garment is provided, it is generated in a gas turbine,
Conventionally, heat that has been radiated to the outside is hindered by the soundproof outer garment and is less likely to diffuse. For this reason, as one of the continuous operating conditions of the gas turbine, it is essential to ensure that the inside of the soundproof outer garment is cooled sufficiently.

Various measures have heretofore been adopted for cooling the inside of the soundproof outer garment. In the above-mentioned proposal, the outer periphery of the casing is covered with a heat insulating material to reduce heat radiation from the casing, Although cooling air is introduced into the inside of the soundproof outer garment, there are various types of gas turbines, and the amount of heat released from the casing also varies, It is not optimal to adopt it for various gas turbines, and it is necessary to employ an optimal measure for each gas turbine. Further, the gas turbine employs a precise structure, and depending on the model, it may be required to maintain the temperature inside the soundproof outer garment at a low temperature of about 60 ° for the reason described later.

[0003] Among such conventionally used cooling measures for the inside of the soundproofing jacket, only the duct connected to the inside of the soundproofing jacket is erected, and the upper end of the duct is attached to the building in which the gas turbine is installed. In some cases, the high-temperature air inside the soundproof outer garment is naturally discharged to the outside through a duct and cooled down. However, in the case where only such a duct is erected to cool the inside of the soundproof jacket, heat is not sufficiently discharged, and the temperature inside the soundproof jacket abnormally increases depending on the operating conditions of the gas turbine. Sometimes.

[0004] When the temperature inside the soundproof outer garment rises in this way, the casing provided to enclose the rotor, rotor blades and the like of the gas turbine is deformed, and the deformation causes the following problems, resulting in a major accident. This may cause the occurrence of a gas turbine emergency stop.

(1) The clearance provided between the labyrinth and the stationary blade attached to the inner peripheral side of the casing and the tip of the moving blade attached to the rotor is broken, and they come into contact with each other, and the frictional heat is reduced. It occurs and burns, sometimes leading to breakage.

[0006] (2) On the outer surface of the casing, various instrumentation parts, such as a thermocouple thermometer and a pressure transmitter, which are extremely weak, are attached, and these instrumentation parts cause malfunction. The operation of the gas turbine may be impaired, and in some cases, these instruments may burn out, possibly leading to a fire.

Further, as described above, when the duct is erected with the upper end protruding to the roof of the building, due to the problem of installation space or the efficiency of air discharge in the soundproof outer garment,
It is also possible to connect the duct divided into multiple bodies to the soundproof outer garment at intervals and to stand upright, but in such a case,
Each of the independently provided ducts needs to be fixed to a wall surface of a building or the like, and for this, a work space or a mounting space for mounting brackets is required between the ducts, as shown in FIG. 3B. In addition, since a plurality of ducts need to be erected at considerable intervals, the installation space of the gas turbine is not reduced, and not only the problem of the installation space is not sufficiently solved, but also the cost increases. In addition, there is a problem that it is difficult to arrange devices to be installed in the vicinity.

[0008] Further, in order to solve the above-mentioned disadvantages of the cooling measures in which only the duct is erected to cool the inside of the soundproof outer garment, an attempt has been made to install a fan for cooling the inside of the soundproof outer garment. I have. In such a case, since the soundproof outer garment and the fan are connected by a duct, it is urgently necessary to devise a rational arrangement including operation, maintenance and inspection of the gas turbine.

Further, when installing such a fan, usually, one fan having a fan capacity of 100% capable of supplying the entire amount of air required for cooling the inside of the soundproof outer garment is installed, or the movable portion is provided. It is common practice to provide a fan having a fan capacity of 100% as a spare machine in anticipation of the occurrence of many fan failures. However,
In the former case, the failure of the fan leads to a situation in which the gas turbine must be stopped in an emergency, and in the latter case, the downsizing of the gas turbine is hindered and the cost increases.

[0010]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned disadvantages of the conventional ventilation system for a soundproof outer garment by improving the ventilation efficiency in the soundproof outer garment and causing the temperature inside the soundproof outer garment to cause deformation of the casing. It can be kept at a low temperature below the allowable temperature, which can reliably prevent gas turbine burning or damage due to deformation of the casing, or the occurrence of fire, etc. The gas turbine can be lightened and inexpensive, and furthermore, the operation and maintenance of the gas turbine can be easily performed, and even when the fan fails, the gas turbine can be restored without stopping the gas turbine. It is an object to provide a ventilation device for a soundproof outer garment that enables continuous operation of a gas turbine.

[0011]

For this reason, the ventilation device for a soundproof outer garment of the present invention has the following means.

(1) In order to reduce noise generated in the gas turbine, the gas turbine is provided so as to surround the casing of the gas turbine. In addition, three branch ducts are provided at separate positions of the soundproof outer garment that ventilates the interior to reduce a rise in temperature, and is connected to each other to individually exhaust heated internal air.

[0013] The three ducts connected to the soundproof outer garment can be ventilated in the soundproof outer garment even when the ventilation inside the soundproof outer garment is performed by using any two branch ducts of the three ducts. It is preferable to select a position that is even and does not cause a local temperature rise, and connect it to the soundproof outer garment. Further, it is preferable that the cross-sectional area of the three branch ducts be large enough that the flow velocity of the discharged air is large and the discharge pressure of the fan is not increased.

(2) Interposed in each of the branch ducts connected to the soundproof outer garment, discharges the heated air in the soundproof outer garment, and the capacity of each fan keeps the temperature in the soundproof outer garment below the allowable temperature. In order to retain, three fans were provided with a capacity capable of exhausting approximately half of the air required to be exhausted from the inside of the soundproof outer garment.

The fan may be such that the intake port is opened in the soundproof outer garment, the discharge port is connected to the branch duct, and the fan is interposed in the branch duct. Although it is necessary to increase the amount of air discharged from the fan, it is preferable that the discharge pressure be as low as about 20 mmAq and that the running cost be reduced by reducing the fan capacity. In addition, at least the intake port of each fan shuts off the inflow of air from the inside of the soundproof outer garment, and even during operation of the gas turbine, maintenance, inspection, and recovery from failure of the specific fan that shut off the inflow of air It is preferable to provide a shut-off device so that construction and the like can be performed.

(3) The three branch ducts on which the fans are installed are assembled on the downstream side of the installation location of the fans, integrated and extended upward, and the upper end thereof is located above the building where the gas turbine is installed. Are arranged, and each of the portions connected to and separated from the three branch ducts is provided with a partition which is partitioned as it is to the upper end thereof to form an independent flow path. A ventilation duct was provided to stand above the soundproof outer garment.

It should be noted that each branch duct is connected to
The cross-sectional area of the flow path formed in the ventilation duct, which allows the ventilation air flowing from each branch duct to be discharged to the upper end in independent sections, increases the flow rate of the discharged air and does not increase the discharge pressure of the fan It is preferable that the size be about the same. In addition, although each of the flow passages is configured to exhaust the ventilation air from the associated branch duct in principle, an emergency damper or the like is provided. In an emergency, the ventilation air from the different branch duct is operated by this damper operation. Is preferably discharged. Further, it is preferable that the tip of the ventilation duct be shaped so that rain or the like does not flow into the flow path.

In this type of ventilator, since the reliability of operation is of the utmost importance, fans with a high possibility of failure include:
It is natural to increase the reliability by adopting one whose reliability has been proved sufficiently in the past, but the ventilation device for a soundproof outer garment of the present invention additionally employs the above-described means. The reliability of the device becomes more assured.

That is, by the above-described means, in order to keep the temperature inside the soundproof outer garbage that rises due to heat radiation from the casing below an allowable temperature at which the temperature does not become locally high, the air inside the soundproof outer garbage is almost uniformly sucked. Three branch ducts which are connected to each other so as to individually discharge the air inside are provided at separated positions of the soundproof outer garment, and each of these branch ducts is provided with a soundproof outer garment in order to maintain the temperature below the allowable temperature. A 50% capacity fan is installed that can discharge approximately half of the air that needs to be exhausted from the inside.
The ventilation duct is made into a single duct by integrating three branch ducts, and a partition is provided vertically inside the duct to divide the ventilation duct into three parts for safe operation. It can be made highly reliable.

That is, by providing three branch ducts connected to the soundproof jacket, a fan interposed in the branch duct, and a ventilation duct divided into three parts, the air discharged from the inside of the soundproof jacket is From the entrance of the branch duct to the exit of the ventilation duct is completely divided into three parts, and the inside of the soundproof outer garment is kept below the allowable temperature by discharging air from the two branch ducts and the ventilation duct of the two-part division By doing so, maintenance of one fan can be performed freely and easily during operation of the gas turbine, and when one fan fails, the fan operation operation of the sequence in which the spare unit is driven immediately is performed. This makes it possible to operate with 100% capacity in any case.

Therefore, the inside of the soundproof outer garment is always kept at a temperature lower than the permissible temperature to prevent the casing from being deformed and to make an emergency stop of the gas turbine. Accidents can be completely prevented. Further, in the event of a fan failure, the gas turbine is stopped by driving the spare machine and operating the shut-off device provided on the side of the fan suction port in which the failure has occurred to shut off the flow of air into the fan. The recovery work can be performed without any trouble, and one fan can always be in a standby state.

In addition, even when one fan fails, the cost can be reduced as compared with a conventional device having a 100% capacity fan as a spare machine in order to secure 100% capacity. At the same time, the size and weight of the fan can be reduced. In addition, since there is no air flow between the fans, a vortex does not occur at the junction of the fan outlets, the flow of air discharged from the branch duct to the outside through the ventilation duct becomes smooth, and the load Does not affect the fan performance, such as fluctuations in the fan discharge pressure.
An extremely low pressure of about mmAq is sufficient.

That is, when air flows between the fans, even if the fans have the same specifications, the performance varies, and the flow from the fan on the high discharge pressure side obstructs the flow from the fan on the low discharge pressure side. However, the performance may be affected, and an extremely low pressure fan of about 20 mmAq cannot be used, leading to an increase in cost and an increase in running costs. When these are operated in parallel with each other, the technique of preventing inhibition by the fans is also an important element to be solved, but such a problem can be easily solved.

Further, since the generation of eddy currents is eliminated and the discharge pressure of the fan can be reduced to an extremely low level, a partition for dividing the inside of the ventilation duct into three parts can be attached with a simple structure. In addition, if a partition wall that partitions the inside of the ventilation duct is not installed, a check valve, switching damper, etc. are required at each fan outlet in order to prevent the fan discharge air from circling, and the number of parts increases, and the manufacturing cost increases. In addition to the increase, the flow path resistance increases, the fan capacity increases, and troubles such as complicated operation and maintenance are required.

Further, the ventilation duct is designed to discharge 50% of the air sucked and discharged by the fan from the branch duct to the outside. At the time of this start-up, the interior is divided into three parts, and the partitioning walls can be made into a simple structure, so that the structure can be made compact, so that the problem of the installation space can be solved, and the weight can be reduced and the cost can be reduced. Prevention of generation of eddy currents at the junction of the fan outlets and prevention of the fan discharge air from flowing around each other, or the necessity of installing a check valve or switching damper to prevent them is eliminated. In addition, the efficiency of discharging air from the soundproof outer garment can be improved. Further, it is possible to provide a gas turbine building having a landscape that is in harmony with the gas turbine construction area.

[0026]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sound-insulating outer garment ventilating apparatus according to an embodiment of the present invention. FIG.
FIG. 1 is a view showing a ventilation device 15 in a soundproof outer garment of the present invention;
1A is a front view, and FIG. 1B is a side view. It should be noted that the actual size is shown in the figure with the human 20 being 180 cm tall, which can be understood in comparison with this.

A labyrinth and a stationary blade are mounted on the inner peripheral side, in which a moving blade, a rotor, etc., which are operated by a high-temperature combustion gas, are incorporated, and are arranged at a predetermined distance from a tip of the moving blade. On the outer peripheral side of the casing (not shown), intake noise, combustion noise, exhaust noise,
Alternatively, a soundproof outer garment 1 is provided, as shown in the figure, to cover the entire casing in order to prevent mixed large noise such as rotation noise from diffusing to the outside.
At the top of the soundproof outer garment 3 are attached three suction ducts 3 constituting a branch duct, one end of which communicates with the inside of the soundproof outer garment 1 and the other end of which communicates with the intake port of the fan 2. The amount of air that needs to be exhausted from the inside of the sound-insulating garment 1 (hereinafter referred to as the amount of ventilation air) in order to maintain the temperature inside the sound-insulating garment 1 radiated from the outer peripheral surface of the casing and increasing in temperature to about 60 ° C. The air is exhausted from the inside of the soundproof clothing.

The three suction ducts 3 for connecting the soundproof outer garment 1 and the fan 2 and for sending the air in the soundproof outer garment 1 to the inlet of the fan 2 usually have any two of the three suction ducts 3. Thus, the ventilation air volume can be sufficiently discharged without increasing the flow rate, and the ventilation inside the soundproof outer garment 1 can be performed. However, any two of the three suction ducts allow the inside of the soundproof outer garment 1 to be ventilated. Even when ventilating, the position in the soundproof outer garment 1 is selected such that the entire area of the sound proof outer garment is substantially evenly distributed and the temperature does not locally rise, and is connected to the top of the soundproof outer garment 1. The cross-sectional area of the three suction ducts is such that when the flow velocity of the air to be ventilated increases, the air resistance increases and the discharge pressure of the fan 2 needs to be increased, or noise is generated by the passing air. Therefore, the flow rate is set to such a level that these problems do not occur when a flow rate of 50% of the ventilation air volume is caused to flow.

The fan 2 which is interposed in each suction duct 2 connected to the soundproof outer garment 1 and discharges the heated air in the soundproof outer garment has a fan capacity of 50% of the above-described ventilation air amount. Three units are arranged in parallel, and during operation, two of the three units are used as normal and the remaining one is used.
When the fan during operation of the stand breaks down, the stand is set to a standby state as a spare machine in which a sequence that can be driven immediately is incorporated.

Further, the discharge pressure of the fan 2 is 20 mmAq
The pressure is extremely low and the discharge capacity is large but the fan capacity is small so that the running cost can be reduced. That is, as described above, the cross-sectional area of the suction duct 1 is increased, and the cross-sectional area of the ventilation duct 5 to be described later is also increased to reduce the flow path resistance. The ventilation in 1 is made enough.

The motor 11 for driving the fan 2 is
If necessary, we will use the ones with consideration given to the pressure resistance and exposure specifications. Further, the discharge ports of the fan 2 are connected to three discharge ducts 4 which are also arranged in parallel and similarly constitute a branch duct, and the three discharge ducts 4 As can be estimated from the height, they are merged at a height of about 3 m from the outlet of the fan 2 to be integrated.

The ventilation duct 5 in which the three discharge ducts 4 are integrated is provided along the side wall of the building 6 so that the ventilation duct 5 can be raised up to the roof of the building 6 in which the gas turbine is installed in accordance with the regulations on exposure protection. Has been established. As shown in FIG. 2, the ventilation duct 5 is a single rectangular duct type in appearance, but a partition 7 is provided in the inside in the vertical direction to flow 50% of the ventilation air volume. In this case, the flow passage resistance is divided into three flow passages 12 having a cross-sectional area capable of increasing the flow velocity without increasing, and each of the partitions 12 is connected to a specific suction duct 3 and a specific fan 2. I have.

That is, the air discharged from the inside of the soundproof outer garment 1 is supplied to the ventilation air using two of the three divided flow paths from the inlet of the suction duct 3 to the outlet of the ventilation duct 5. 50% of the volume is independently flowed and discharged to the outside. In addition, as a countermeasure against rainwater intrusion at the outlet of the ventilation duct 5, the tip is bent slightly downward from the horizontal as shown in the figure, and a bird screen is installed to prevent foreign matter from entering. And rust prevention measures to protect the inside of the ventilation duct 5. Further, the tip of the ventilation duct 5 can be freely diverted according to the conditions such as the landscape of the area where the building 6 is constructed.

As described above, the ventilation device 15 in the soundproof outer garment of the present embodiment has a gas turbine engine, a soundproof outer garment 1, a suction duct 3, a fan 2, a discharge duct 4, a ventilation duct 5, Since the building 6 has a complicatedly connected structure, it is difficult to anticipate which event will be settled for mutual events, for example, earthquakes, vibrations, uneven settlements, and especially uneven settlements. Adjustment of ± is possible for the mounting seat of No. 2. As a countermeasure against non-compliance, measures are taken to prevent the fan 2 from being cut off by providing an expansion 8 at the entrance and exit of the fan 2, and consideration is also given to installing a closed damper (not shown) used when the fire extinguisher is operated.

The provision of the closing damper on the intake port side of the fan 2 means that the air exhausted from the inside of the soundproof outer garment 1 described above is completely removed from the inlet of the suction duct 3 to the outlet of the ventilation duct 5. In combination with the fact that 50% of the volume of ventilation air flows independently through two of the divided flow paths and is discharged to the outside, even during operation of the gas turbine, In particular, there is an advantage that maintenance and inspection of the fan 2 which frequently fails and repair work for the failure can be performed.

For this purpose, the hoist 9 is provided at a height at which maintenance such as disassembly and inspection of the fan 2 is easily performed, and in a commercial gas turbine facility, a duct is installed in consideration of a duct arrangement which is to be installed at a “normal high place”. 10 is provided so that patrol can be performed sequentially from the ground to the installation location, and access to the same degree as general ground-mounted equipment is considered. For this reason, general disassembly and inspection can be performed on the spot, and if further disassembly and inspection is required, it can be carried on the ground.

That is, generally, inspection or maintenance of equipment and the like installed at a high place is performed by preparing a crane truck and the like every necessary time. Permanent access is provided due to the high installation cost. Hoist 9 or walkway 1
Although it is common general knowledge that 0 is not provided, these are extremely important for the continuous operation of the gas turbine in the ventilation device for a soundproof outer garment of the present embodiment.
The hoist 9 and the corridor 10 are provided in consideration of access and easy workability in consideration of the fact that maintenance can be carried out without giving a fear of being at a high place and that the work can be performed with a sense of being on the ground. .

[0038]

As described above, according to the ventilating apparatus in the soundproof outer garment of the present invention, the soundproof outer garment is connected and heated at the separated positions of the soundproof outer garment which ventilates the inside and reduces the temperature rise. Three branch ducts are provided to individually discharge the air inside the air conditioner. Each branch duct is interposed to discharge the heated air in the soundproof outer garment, and each fan capacity is In order to keep the temperature inside the soundproofing jacket below the permissible temperature, three fans with a capacity capable of discharging approximately half of the air that needs to be discharged from the inside of the soundproofing jacket are provided, and this fan is installed. The branch ducts are gathered, integrated and extended upward on the downstream side of the installation location of the fan so that the upper end thereof is arranged above the building where the gas turbine is installed. Ventilation ducts, each of which is connected to the branch duct of the above, is provided with a partition wall inside which is partitioned as it is to the upper end to form an independent flow path, and stands up above the soundproof outer garment. Is provided.

With this arrangement, maintenance of one fan can be freely and easily performed during operation of the gas turbine, and the operation of the fan can be performed in a sequence in which the spare unit is driven immediately when one fan fails. In any case, an operation that can secure 100% capacity can be performed. Therefore, the inside of the soundproof outer garment can always be maintained at a temperature lower than the allowable temperature, which prevents the casing from being deformed, which necessitates an emergency stop of the gas turbine, a malfunction caused by the casing deformation, or the occurrence of a major accident. Can be completely prevented.

Further, in order to reduce the installation area of the duct and to prevent the air discharged from the fans from flowing around each other, it is not necessary to provide a check valve, a switching damper or the like at each fan outlet. The gas turbine can be made compact, light and inexpensive, and the operation, maintenance and inspection of the gas turbine can be facilitated, and the gas turbine can be stopped even when the fan fails. The gas turbine can be restored without any trouble, and the gas turbine can be operated continuously.

Further, since the apparatus is installed at a high place, a combination excellent in terms of driving and safety can be obtained, and the overall combination can be excellent. As a result, depending on the type of gas turbine, the temperature may be as high as 150 ° C. or more, and various measures must be taken to prevent the casing from being deformed. Thus, in the ventilation device for soundproofing outerwear of the present invention, the air in the soundproofing outerwear can be discharged with a small fan capacity, and the temperature in the soundproof outerwear can easily be maintained at an allowable temperature of 60 ° C or lower. become able to.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a ventilation device in a soundproof outer garment of the present invention, wherein FIG. 1 (a) is a front view, FIG. 1 (b) is a side view,

FIG. 2 is a diagram showing a simplified version of the embodiment shown in FIG. 1,
2 (a) is an overall view, and FIG. 2 (b) is an arrow A in FIG. 2 (a).
-A cross section,

FIG. 3 is a cross-sectional view of a ventilation duct of a conventional soundproof outer hood ventilation apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soundproof outer garment 2 Fan 3 Suction duct as a branch duct 4 Discharge duct as a branch duct 5 Ventilation duct 6 Building 7 Partition wall 8 Expansion 9 Hoist 10 Walkway 11 Motor 12 Ventilation duct flow path 15 Ventilator for soundproof outer garment 20 Height Human showing as a reference

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02C 7/24 F02C 7/00 F02C 7/18

Claims (1)

(57) [Claims] 1. A ventilation inside a soundproof outer garment provided around a gas turbine for reducing noise generated by the gas turbine to reduce a rise in temperature and to keep the temperature below an allowable temperature. In the apparatus, three branch ducts respectively connected to the separated positions of the soundproof outer garment and individually discharging air in the soundproof outer garment, and interposed in each of the branch ducts, and controlling the temperature in the soundproof outer garment. A fan having a capacity capable of discharging approximately half of the air required for maintaining the temperature below the allowable temperature from the inside of the soundproof outer garment, and the branch duct being assembled and integrated on the downstream side of the fan, and the gas turbine is integrated. A ventilation duct which is provided upright above a building in which a partition is installed and in which a partition wall forming a section connected to each of the branch ducts is provided. Internal ventilation system.