JP2007309224A - Gas turbine device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform highly reliable cooling and ventilation, by directly connecting a fan to an output shaft of a gas turbine body. <P>SOLUTION: This gas turbine device 1 is provided for cooling a lubricating oil cooler 11 and a gas turbine 3, by making air flow in an enclosure, by storing the gas turbine 3 having the lubricating oil cooler 11 in the enclosure 6, and forcibly performs ventilation by taking cooling air in the enclosure 6, by arranging the fan 13 directly connected to a driving shaft 5a driven by the gas turbine 3, on the outlet side of a cooling air flow passage formed in the enclosure 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas turbine apparatus, and more particularly to a ventilation / cooling structure in an enclosure in which the gas turbine is installed.

  The gas turbine apparatus includes a compressor, a turbine and a combustor that are coupled to the compressor, and mixes and burns air and fuel pressurized by the compressor in the combustor to generate a high-temperature and high-pressure gas. In this gas expansion process, the turbine is rotationally driven, a part of which is used as the driving power for the compressor, and at the same time, the remaining part is taken out as rotational power, and the generator is connected to the output shaft, and other driven machines The residual gas is discharged to the outside through the exhaust port.

  This gas turbine apparatus is packaged or unitized inside a soundproof enclosure, and in addition to the combustion air intake system, cooling air is taken in and circulated in the enclosure to circulate the apparatus. Cooling of each part which comprises and cooling of lubricating oil is performed.

  Conventionally, an electric fan driven by an external power supply has been used as a ventilation means for this cooling, but it is affected by disturbances such as a failure of the external power supply and stops even if the gas turbine device itself is healthy. I was forced to. That is, if a power failure occurs, the fan stops, the gas turbine heats and stops, and the driven machine also stops. Although it is possible to increase the number of cooling lubricants so that they can withstand short-term overheating, the allowable time is still a few minutes, which is not sufficient.

  In view of this, Japanese Patent Application Laid-Open Publication No. 2004-228688 discloses a device that ventilates and exhausts the interior of the enclosure by the rotational power of a hydraulic motor driven by a hydraulic pump.

Japanese Patent Application Laid-Open No. H10-228707 discloses a fan that drives a fan to a turbine output shaft via a belt transmission mechanism to ventilate and exhaust the inside of the enclosure.
Japanese Patent Laid-Open No. 2005-299681 Japanese Patent Publication No. 10-47059

  However, in Patent Document 1, the fan is rotationally driven via a bypass means such as a hydraulic pump and a motor, which requires an installation space and a complicated mechanism, and there is a risk that reliability may be lowered due to a malfunction of the fluid system. . In other words, if hydraulic leak or hydraulic equipment failure occurs, ventilation becomes impossible, the gas turbine overheats and stops, and the driven machine also stops.

  Patent Document 2 also drives a fan to rotate through a mechanical detour means called a belt transmission system, and requires a transmission system installation space and the like as described above. May decrease. That is, if a belt breakage, belt slip, bearing failure, or the like occurs, ventilation becomes impossible, the gas turbine overheats and stops, and the driven machine also stops.

  Therefore, the present invention solves the above-mentioned problems, and the object is to connect the fan directly to the output shaft of the reduction gear directly connected to the turbine so that highly reliable cooling and ventilation can be performed. A gas turbine apparatus configured as described above is provided.

  In order to achieve the above object, a gas turbine apparatus according to the present invention includes a gas turbine having a lubricant cooler accommodated in an enclosure, and circulating cooling air in the enclosure, whereby the lubricant cooler and the gas are circulated. In the gas turbine apparatus for cooling the turbine, a cooling air is provided in the enclosure by providing a fan directly connected to a drive shaft driven by the gas turbine at an outlet side of a cooling air flow path formed in the enclosure. It is characterized by taking in and forcibly ventilating.

  According to a second aspect of the present invention, the fan according to the first aspect is characterized in that the fan is a centrifugal fan provided on the side opposite to the air intake port with the gas turbine interposed in the enclosure.

  A third aspect of the present invention is the centrifugal fan according to the first or second aspect, wherein the centrifugal fan is provided with an air intake opening at a central portion and an exhaust duct that opens in an expanded state from the upper one side toward the outside. It has a flat disk-shaped fan casing and a fan main body that is connected to a drive shaft that passes through the center of the air intake port in the fan casing.

  According to the first aspect of the present invention, a hydraulic system or a mechanical power transmission mechanism is unnecessary, the mechanism can be simplified, and the reliability of the mechanism can be greatly improved. In other words, according to the gas turbine apparatus of the present invention, the fan is directly connected to the drive shaft of the gas turbine and rotates, so that the ventilation system can continue to function effectively as long as the prime mover side is healthy. In other words, the case where the fan stops means when the prime mover side has failed, and since it is already in a state where the driven machine cannot be driven, the fan stop at that stage is not a problem.

  According to the second aspect of the invention, in addition to the operation and effect of the first aspect, the exhaust flow is in the radial direction with respect to the output shaft of the gas turbine. Space can be minimized.

  According to the invention of claim 3, in addition to the operation and effect of claim 1 or 2, the air is taken into the inside of the fan casing, and the discharge operation is performed with the rotation of the fan body. Since it can be discharged outside while expanding the area, the power load is small.

The best mode of the present invention will be described below with reference to the accompanying drawings.
1 is an explanatory view showing the overall configuration of the gas turbine apparatus of the present invention, FIG. 2 is an enlarged cross-sectional view showing a fan in part A of FIG. 1, FIG. 3 is an enlarged front view in part A, and FIG. It is a perspective view of a fan.

  In FIG. 1, a gas turbine device 1 includes an air compressor 2, a turbine 3 and a combustor 4, and a speed reducer 5 as a driven machine that is coupled to an output shaft 3 a of the turbine 3. As a pump, a generator or the like that is stored in the soundproof enclosure 6 and separated from the outside, and is connected to the outside of the enclosure 6 from the speed reducer 5 to the output shaft 5a protruding through the enclosure 6 An external driven machine 7 is provided.

  The enclosure 6 is provided with an air supply duct 8 communicating with the intake port 2a of the compressor 2 and an exhaust duct 9 communicating with the exhaust port 3b of the turbine 3. The outside air introduced through the air supply duct 8 is indicated by a black arrow in the figure. As shown, the high-pressure air is introduced into the compressor 2 and mixed with the fuel in the combustor 4 to burn, and the turbine 3 is rotationally driven by the burned high-temperature and high-pressure gas. It is discharged to the outside through the duct 9.

  In addition, an air supply duct 10 for introducing cooling air communicating with the rear side space of the compressor 2 is provided at the rear part of the enclosure 6.

  A lubricating oil cooler 11 is arranged at the outside air intake end on the side of the enclosure 6 communicating with the air supply duct 10, and the outside air introduced into the inside through the air supply duct 10 is cooled as indicated by a white arrow in the figure. 11 is used to cool the lubricating oil circulating between the lubricating oil supply device 12 and the movable part of the compressor 2 and the turbine 3 while cooling each part to an appropriate temperature by the flow of the air flow. The air is discharged to the outside of the enclosure 6 through a centrifugal fan 13 which is on the front end side of the enclosure 6 and connected to the front end of the speed reducer 5.

  In addition, the code | symbol 14 in FIG. 1 is a filter arrange | positioned at the external air intake of each said air supply ducts 8 and 10. FIG.

  2 to 4 show the details of the centrifugal fan 13. This centrifugal fan 13 is integrally attached to the front end side wall surface of the enclosure 6, and a bell mouth 15 for taking in air projects from the center thereof. A substantially flat disk-shaped fan casing 16 and an exhaust duct 17 that is open to penetrate the ceiling portion of the enclosure 6 in a state where the fan casing 16 communicates with one upper side portion of the fan casing 16 and expands in a tapered shape toward the upper side. And a fan main body 19 which is disposed in the fan casing 16 and is connected to the output shaft 5a of the reduction gear 5 via a bearing boss 18.

  The fan body 19 includes a large number of rotor blades 22 arranged between a pair of front and rear rotor disks 20 and 21 as shown in an enlarged view in particular in FIG. By rotating as indicated by the arrows, the air taken in through the bell mouth 15 is sequentially discharged from the fan casing 16 to the outside through the exhaust duct 17.

  Accordingly, the centrifugal fan 13 rotates directly in response to the rotation of the gas turbine apparatus 1 immediately after the gas turbine apparatus 1 is started, and exhausts the air from the enclosure 6, and at the same time, due to the negative pressure, New outside air is introduced into the interior through the air duct 10, and each part of the equipment housed in the interior including the lubricating oil cooler 11 is appropriately cooled. In addition, since the rotational speed of the turbine 3 is extremely high, the rotational speed of the speed reducer 5 is suppressed to an appropriate rotational speed according to the reduction ratio, and therefore the rotational speed of the fan body 19 is set to the internal exhaust or ventilation. In doing so, it is almost constant in a highly efficient region. Further, since the exhausted air is exhausted while diffusing in accordance with the change in the cross-sectional area of the exhaust duct 17, the load power can be kept small.

In addition, although the said embodiment demonstrated the case where the centrifugal fan 13 was used, it is good also as a structure which exhausts by attaching an axial fan to the output shaft of the reduction gear device 5 and rotationally driving.
However, with this method, the air flow is in the axial direction, and it is necessary to take the dimension of the enclosure 6 longer in the axial direction, resulting in space problems. Therefore, the optimum design considering the dimensions, discharge angle, etc. is necessary.

It is explanatory drawing which shows the whole structure of the gas turbine apparatus of this invention. It is sectional drawing which expands and shows the fan in the A section of FIG. Front view showing the enlarged fan in part A It is a perspective view of the same fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas turbine apparatus 2 Compressor 3 Turbine 4 Combustor 5 Deceleration apparatus 5a Output shaft 6 Enclosure 10 Air supply duct (air intake)
11 Lubricating oil cooler 13 Centrifugal fan 16 Fan casing 19 Fan body

Claims (3)

In a gas turbine device that cools the lubricating oil cooler and the gas turbine by storing a gas turbine having a lubricating oil cooler in an enclosure and circulating cooling air in the enclosure,
By providing a fan directly connected to the drive shaft driven by the gas turbine on the outlet side of the cooling air flow path formed in the enclosure, the cooling air is taken into the enclosure and forcedly ventilated. A gas turbine device. The gas turbine apparatus according to claim 1, wherein the fan is a centrifugal fan provided on the opposite side of the air intake from the gas turbine in the enclosure. The centrifugal fan has a substantially flat disk-shaped fan casing having an air intake opening at the center and an exhaust duct that is opened from the upper side toward the outside. The gas turbine apparatus according to claim 1, further comprising: a fan body that is coupled to a drive shaft that passes through a center of the air intake port.

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