JP2001020716A - Muffler for high-temperature exhaust gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and compact muffler for emitting exhaust gas by mixing gas, having a temperature lower than exhaust gas from an engine, into the exhaust gas to cool it, and emitting it to the environment via the muffler. SOLUTION: A gas turbine 11 is housed in a package 20, brake horsepower is output from a rotation axis 14 via a reduction gear 12 and a coupling 13, air is taken in from an intake duct 15, and exhaust air is emitted to the environment from an exhaust emission outlet 18 via an exhaust duct 16 after noise is reduced by a muffler 25. A ventilation exhaust duct 21 of the package 20 is connected with the exhaust duct 16 of the gas turbine 11. Exhaust air from ventilation inside the package 20 is mixed into the exhaust duct 16 of the gas turbine 11 by a blower 22 disposed in the ventilation exhaust duct 21 of the package 20. Therefore, since ventilation air temperature inside the package 20 is much lower than exhaust in the gas turbine 11, an exhaust temperature in the gas turbine 11 can be reduced significantly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature exhaust gas muffler, and more particularly to a muffler for attenuating the noise of exhaust gas when a high-temperature exhaust gas of a motor is discharged into the atmosphere.

[0002]

2. Description of the Related Art If the exhaust gas of a prime mover such as a gas turbine or a diesel engine is released into the atmosphere as it is, it will cause noise pollution. I am trying to do it. 4 to 6 show a schematic configuration of a motor unit provided with a conventional silencer. This is the case where a gas turbine that discharges high-temperature exhaust gas is used as a prime mover.

[0003] The output of the gas turbine 11 passes through a reduction gear 12 and a shaft coupling 13 and is taken out of a rotary shaft 14 to the outside.
The air sucked from the intake filter 15 is mixed with fuel in the gas turbine 11 and burns, and a shaft output is taken out.
6. The air is discharged from the exhaust port 18 into the atmosphere via the silencer 17. On the other hand, the package 20 containing the gas turbine 11 needs ventilation, and is sucked in from the ventilation port 24, and the air ventilated in the package 20 passes through the ventilation discharge duct 21 and is exhausted by the blower 22. The noise is attenuated via the silencer 23 and then released into the atmosphere.

[0004] When exhaust gas from a prime mover such as a gas turbine or a diesel engine, the exhaust gas from the diesel engine or the like is not so high in temperature, so that there is no problem if the exhaust gas is directly discharged into the atmosphere via a silencer. In the case of exhaust gas having a high temperature as described above, the muffler made of ordinary steel cannot withstand high heat. For this reason, the high-temperature exhaust gas silencer needs to be made of a heat-resistant and corrosion-resistant expensive material such as stainless steel. Therefore, in a gas turbine or the like, this manufacturing cost becomes a problem. On the other hand, a prime mover is often used in a package from the viewpoint of safety and soundproofing, and requires a blower and an exhaust silencer for ventilation of the package.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to manufacture a silencer for discharging high-temperature exhaust gas of a motor into the atmosphere at a low cost, and to provide the same. An object of the present invention is to provide a high-temperature exhaust gas silencer that can reduce the size of a silencer.

[0006]

SUMMARY OF THE INVENTION A high-temperature exhaust gas silencer according to the present invention is an exhaust gas silencer that discharges exhaust gas of a prime mover to the atmosphere via a silencer. Mixing low temperature gas into the exhaust gas,
The temperature of the exhaust gas is lowered, and the exhaust gas is discharged into the atmosphere via the silencer.

According to the present invention described above, for example, the air ventilating the package has a lower temperature than the exhaust gas of the gas turbine. The temperature can be lowered. Therefore, the muffler for high-temperature exhaust gas can be made of inexpensive ordinary steel without using expensive materials such as stainless steel having excellent heat resistance and corrosion resistance. Also, by lowering the temperature of the high-temperature exhaust gas, the sound speed is reduced and the wavelength of the noise is shortened, so that the muffler can be made smaller than before. Thus, a silencer for high-temperature exhaust gas such as a gas turbine can be manufactured at low cost and in a small size.

[0008] The present invention is also characterized in that exhaust air of ventilation in a package containing the motor is mixed with exhaust gas of the motor to be used for lowering the temperature of the exhaust gas.
This eliminates the need for a package ventilation silencer, simplifies the overall package structure, and reduces its manufacturing cost.

[0009] Further, the exhaust of ventilation in the package containing the motor may be mixed with the exhaust gas of the motor using a blower to be used for lowering the temperature of the exhaust gas. Thereby, the blower for ventilation of the package can be used as it is for mixing the low-temperature gas into the high-temperature exhaust gas.

An ejector device is provided at a place where a gas lower in temperature than the exhaust gas of the prime mover is mixed into the exhaust gas to narrow the flow passage area of the exhaust gas duct to increase the flow rate of the exhaust gas. It may be mixed with the exhaust gas and used to lower the temperature of the exhaust gas. This eliminates the need for a power source such as a blower when mixing a low-temperature gas with a high-temperature exhaust gas, thereby reducing manufacturing costs and saving energy during operation.

Further, the motor unit of the present invention includes a motor for discharging high-temperature exhaust gas, and a ventilation discharge duct for discharging ventilation of a package storing the motor, and the ventilation discharge duct is connected to the high-temperature exhaust gas. And a muffler for silencing the exhaust gas downstream of the connection. As a result, the exhaust gas temperature of the silencer can be reduced, and there is no need to use an expensive material such as a stainless steel material.
The size can be reduced, and the ventilation of the package can be effectively used. In general, according to the present invention, the cost of the prime mover unit can be reduced, and the size and size can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same reference numerals in the drawings attached to the attached drawings indicate the same or corresponding parts.

FIGS. 1 to 3 show a gas turbine unit provided with a high-temperature exhaust gas silencer according to an embodiment of the present invention. The basic configuration of this device is the same as the configuration shown in FIGS. 4 to 6 of the related art. That is, the package 20
A gas turbine 11 is housed therein, and the shaft output is taken out from a rotating shaft 14 via a speed reducer 12 and a shaft coupling 13. Intake of the gas turbine 11 is performed through an intake duct 15, and exhaust gas enters a silencer 25 through an exhaust duct 16, where the sound is silenced, and then discharged to the atmosphere from an exhaust outlet 18.

The gas turbine unit differs from the prior art in that the ventilation exhaust duct 21 of the package is connected to the exhaust duct 16 of the gas turbine 11 and that the gas turbine unit is made small and made of ordinary steel. That is, a silencer 25 is used. Ventilation exhaust duct 21 of package
, A blower 22 is disposed therein, and the exhaust air due to the ventilation in the package 20 is pushed into the exhaust duct 16 of the gas turbine to be mixed. Thus, since the temperature of the ventilation air in the package 20 is much lower than the exhaust gas of the gas turbine, the temperature of the exhaust gas of the gas turbine can be significantly reduced. Therefore, as described above, the silencer 25 does not need to use an expensive stainless steel material,
It can be manufactured using ordinary steel materials.

The sound speed of the exhaust gas of the prime mover is proportional to the square root of the absolute temperature as shown in equation (1). Further, the wavelength of the noise of the exhaust gas is proportional to the sound speed of the exhaust gas and inversely proportional to the frequency as shown in equation (2). C = 331.5 [(273 + t) / 273] ^1/2 (1) C: Sound velocity of exhaust gas m / s t: Temperature of exhaust gas ℃ λ = c / f (2) λ: Wavelength of noise m f: Noise frequency Hz

Since the frequency of the noise of the exhaust gas of the prime mover does not change with the temperature of the exhaust gas, the wavelength decreases as the sound speed of the exhaust gas decreases. Since the length of the muffler is determined by the wavelength of the noise to be muffled, lowering the temperature of the exhaust gas shortens the wavelength of the noise, and thus allows the muffler to be shorter. This makes it possible to reduce the size of the muffler and further downsize the package.

On the other hand, in the package 20, the ventilation of the package can be effectively used by pushing the ventilation air of the package into the exhaust duct of the gas turbine using the blower 22. That is, the ventilation which was conventionally simply thrown out of the package can be used for cooling the high-temperature exhaust gas.
As described above, since the silencing equipment for ventilating the package, which is required in the related art, is not required, the manufacturing cost can be reduced accordingly. By reducing the temperature of the exhaust gas in this way, the amount of generated noise can be reduced.

When the ventilation air is pushed into the exhaust gas duct, an ejector device may be provided instead of the blower. That is, when mixing a gas having a lower temperature than the exhaust gas into the exhaust gas of the prime mover, the ejector effect of narrowing the flow path area of the exhaust gas duct and increasing the flow velocity of the exhaust gas allows the low-temperature gas to be used without using a blower. It can be introduced into the exhaust gas duct of the prime mover. Thereby, low-temperature ventilation air can be mixed into high-temperature exhaust gas without power.

Although the above-described embodiment is directed to a prime mover unit in which a gas turbine is housed in a package, it goes without saying that various modifications can be made without departing from the spirit of the present invention. . For example, an ejector device may be used to mix air from the atmosphere into the high-temperature exhaust gas of the exhaust duct of the gas turbine. This makes it possible to reduce the size and cost of the high-temperature exhaust gas silencing equipment such as a gas turbine regardless of the package.

[0020]

As described above, according to the present invention, a silencer used for releasing high-temperature exhaust gas from a gas turbine or the like to the atmosphere can be manufactured at low cost and can be downsized. it can. Further, by effectively utilizing the ventilation of the package, in addition to the above-described effects, the silencer of the package can be further omitted, and the cost of the entire package can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of the inside of a prime mover unit according to an embodiment of the present invention.

FIG. 2 is a front external view of the motor unit shown in FIG.

FIG. 3 is a side external view of the motor unit shown in FIG. 1;

FIG. 4 is a front view of the inside of a conventional motor unit.

FIG. 5 is a front external view of the motor unit shown in FIG. 4;

FIG. 6 is a side view of the prime mover unit shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Gas turbine 12 Reduction gear 13 Shaft coupling 14 Shaft 15 Combustion intake filter 16 Exhaust duct 17, 25 Muffler 18 Exhaust discharge port 20 Package 21 Ventilation exhaust duct 22 Ventilation blower

Claims (5)

[Claims] 1. An exhaust gas silencer for discharging exhaust gas of a prime mover to the atmosphere via a silencer, wherein a gas having a lower temperature than the exhaust gas of the prime mover is mixed into the exhaust gas. A high-temperature exhaust gas silencer, wherein the temperature of the exhaust gas is reduced and then discharged to the atmosphere via the silencer. 2. The exhaust system according to claim 1, wherein ventilation exhaust in a package containing the motor is mixed with exhaust gas of the motor to reduce the temperature of the exhaust gas. High-temperature exhaust gas silencing equipment. 3. The method according to claim 1, wherein the exhaust gas of the ventilation in the package storing the motor is mixed with the exhaust gas of the motor using a blower to reduce the temperature of the exhaust gas. The high-temperature exhaust gas silencing device according to 1 or 2. 4. An ejector device for narrowing a flow passage area of an exhaust gas duct to increase a flow rate of the exhaust gas at a location where a gas lower in temperature than the exhaust gas of the prime mover is mixed into the exhaust gas; 3. The high-temperature exhaust gas silencer according to claim 1, wherein the exhaust gas is mixed into the exhaust gas to reduce the temperature of the exhaust gas. 5. A motor for discharging high-temperature exhaust gas, and a ventilation exhaust duct for discharging ventilation of a package containing the motor, the ventilation exhaust duct being connected to the exhaust duct for high-temperature exhaust gas, A prime mover unit comprising a muffler for silencing the exhaust gas downstream of the connection part.