Low-noise emission equipment for combined cycle power generation of gas turbine

Abstract

The utility model relates to the technical field of gas turbine power generation, in particular to gas turbine combined cycle power generation low-noise emission equipment which comprises a sound absorption box body, a box door is hinged to one side of the sound absorption box body, and through holes are formed in the two faces of the sound absorption box body respectively. The silencing box body is arranged in the sound absorption box body, an air inlet is formed in one side of the silencing box body, an air outlet is formed in the other side of the silencing box body, and the air inlet and the air outlet are matched with the through holes in the two faces of the sound absorption box body respectively. Compared with the prior art, by arranging the silencing box body, the multistage serially-connected silencing cavities and the complex airflow path, stage-by-stage attenuation, disturbance and dissipation of sound waves are effectively achieved, linear propagation and high-frequency impact of noise are avoided, the noise reduction efficiency is improved, and the noise pollution risk of the system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine power generation technology, and in particular to a low-noise emission device for combined cycle gas turbine power generation. Background Technology

[0002] Combined cycle gas turbine power generation systems are widely used in large-scale power generation and petrochemical industries. As a highly efficient heat-to-electricity conversion device, it drives a gas turbine to rotate at high speed to generate electricity by burning natural gas or other gaseous fuels, and further recovers the high-temperature exhaust gas for use in a steam turbine to generate electricity, thereby improving overall energy efficiency. However, during its continuous operation under high load, high temperature, and high pressure, the exhaust velocity at the tail of the gas turbine is extremely high, often accompanied by a large amount of turbulence and sound energy release, generating strong broadband noise, especially with extremely high sound pressure levels in the mid-to-high frequency range. This can cause mechanical fatigue damage to the equipment around the unit, and may also cause hearing damage and physiological stress to operators. In severe cases, it can even cause resonance damage or disrupt the normal operation of precision equipment. In addition, the high-speed exhaust often contains fine particles, heat waves, and flue gas. If not properly controlled and treated, this will further aggravate environmental pollution and affect ecological and production safety.

[0003] In existing technologies, traditional emission devices typically have simple airflow paths, strong linearity, short sound wave propagation paths, and are prone to resonance and high-pressure pulse noise. They lack effective control over airflow speed and direction, and cannot perform secondary disturbance and noise reduction on residual airflow. Instantaneous high-pressure gas is directly discharged, which easily results in high noise peaks and strong emission impact. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a low-noise emission device for combined cycle gas turbine power generation, so as to solve the problems of traditional emission devices, which usually have simple airflow paths, strong linear sound wave propagation, lack of effective airflow control and secondary noise reduction, which easily lead to resonance, pulse noise and high-pressure emission impact.

[0005] Based on the above objectives, this utility model provides a low-noise emission device for combined cycle gas turbine power generation, comprising: a sound-absorbing box, a door hinged to one side of the sound-absorbing box, and through holes on both sides of the sound-absorbing box;

[0006] A sound-absorbing box is provided inside the sound-absorbing box. An air inlet is provided on one side of the sound-absorbing box, and an air outlet is provided on the other side. The air inlet and the air outlet are respectively adapted to the through holes on both sides of the sound-absorbing box.

[0007] A cooling tank is positioned above the soundproof enclosure.

[0008] Preferably, a mounting plate is fixedly installed on the bottom surface of the sound-absorbing box, and positioning screws are provided at the four corners of the mounting plate to fix it to the bottom of the sound-absorbing box.

[0009] Preferably, the interior of the silencer housing is provided with a first silencer chamber, a second silencer chamber, a third silencer chamber, a fourth silencer chamber, and a fifth silencer chamber in sequence from the air inlet to the air outlet, and the first silencer chamber, the second silencer chamber, the third silencer chamber, the fourth silencer chamber, and the fifth silencer chamber are all separated by partitions.

[0010] Preferably, a first air inlet pipe is fixedly installed inside the silencer housing on the side away from the air outlet. One end of the first air inlet pipe is connected to the air inlet, and the other end of the first air inlet pipe is connected to the third silencer cavity. A plurality of exhaust holes are opened on one side of the first air inlet pipe, and the plurality of exhaust holes are connected to the second silencer cavity.

[0011] Preferably, a second air inlet pipe is provided on one side of the third silencing chamber, directly opposite the first air inlet pipe, and the other end of the second air inlet pipe is connected to the fifth silencing chamber. A first return air pipe is provided in the middle between the fifth silencing chamber and the third silencing chamber. A second return air pipe is provided in the middle between the third silencing chamber and the second silencing chamber. A third return air pipe is provided in the middle between the second silencing chamber and the first silencing chamber. An air outlet pipe is provided on the side of the silencing housing away from the air inlet. One end of the air outlet pipe is connected to the first silencing chamber, and the other end of the air outlet pipe is connected to the air outlet.

[0012] Preferably, a turbulence port is provided on one side of the middle part of the air outlet pipe, and the turbulence port is connected to the third silencer cavity.

[0013] Preferably, guide plates are provided on both sides of the turbulence inlet, and the two guide plates are arranged in an outward V-shape.

[0014] Preferably, a smoke filter is fitted onto one end of the air outlet.

[0015] Preferably, a reflector is provided on the inner side of the sound-absorbing box and the inner side of the box door, and the reflector is arranged in an inclined semi-circular shape.

[0016] Preferably, the reflector has an internal interlayer, which is a sound-absorbing layer.

[0017] The beneficial effects of this utility model are:

[0018] 1. This low-noise emission equipment for combined cycle gas turbine power generation effectively achieves progressive attenuation, disturbance, and dissipation of sound waves through a multi-stage series of silencing chambers and a complex airflow path, avoiding the straight-line propagation and high-frequency impact of noise. The coordinated guidance of the first and second intake pipes and three sets of return pipes allows the gas sound energy to turbulently collide between different chambers, enhancing the sound energy dissipation efficiency. Combined with a through-type exhaust pipe, it achieves smooth airflow discharge. The overall structure not only has efficient multi-frequency noise attenuation capabilities but also ensures the continuity and stability of gas flow, improving noise reduction efficiency and reducing the risk of system noise pollution. It is suitable for the high-intensity, low-noise operation requirements of exhaust systems for high-energy equipment such as gas turbines.

[0019] 2. This low-noise emission equipment for combined cycle gas turbine power generation uses a turbulence port on the exhaust pipe to guide part of the high-pressure airflow back to the third silencer chamber for secondary noise reduction. At the same time, the guide plates arranged in an outward V-shape effectively guide the gas deflection and stabilize the flow direction, preventing noise generation and aerodynamic disturbance, improving the turbulence back-absorption efficiency and reducing instantaneous exhaust impact. Finally, combined with the tail smoke filter, it completes the dual functions of gas purification and noise reduction.

[0020] 3. This low-noise emission equipment for combined cycle gas turbine power generation features a sound-absorbing enclosure with an inclined semi-circular reflector that disperses sound wave reflections, preventing resonance and linear propagation concentration, and improving the uniformity of sound energy distribution within the enclosure. The internal sound-absorbing layer material has excellent energy absorption properties, achieving dual noise reduction through sound wave reflection and absorption. This significantly enhances the overall sound absorption efficiency and frequency band coverage, ensuring quiet system operation and environmental friendliness. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the soundproof enclosure of this utility model;

[0025] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0026] The diagram is marked as follows:

[0027] 1. Sound-absorbing enclosure; 2. Silencing enclosure; 3. Mounting plate; 4. Positioning screws; 5. Cooling tank; 6. Air inlet; 7. First silencing chamber; 8. Second silencing chamber; 9. Third silencing chamber; 10. Fourth silencing chamber; 11. Fifth silencing chamber; 12. First air inlet pipe; 13. Exhaust port; 14. Second air inlet pipe; 15. First return air pipe; 16. Second return air pipe; 17. Third return air pipe; 18. Air outlet pipe; 19. Guide plate; 20. Air outlet; 21. Enclosure door; 22. Reflector. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0029] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] like Figures 1 to 4 As shown, the low-noise emission equipment for combined cycle gas turbine power generation includes a sound-absorbing box 1, with a door 21 hinged to one side and through holes on both sides; a silencer box 2, located inside the sound-absorbing box 1, with an air inlet 6 on one side and an air outlet 20 on the other side, the air inlet 6 and the air outlet 20 respectively matching the through holes on both sides of the sound-absorbing box 1; and a cooling tank 5, located above the silencer box 2, wherein a mounting plate 3 is fixedly installed on the bottom surface of the silencer box 2, and positioning screws 4 are provided at the four corners of the mounting plate 3 to be fixedly connected to the bottom of the sound-absorbing box 1.

[0031] During equipment operation, high-temperature, high-speed exhaust gas or noisy gas first enters through the through-hole on one side of the sound-absorbing box 1, and is then introduced into the interior through the air inlet 6 of the corresponding silencer box 2. The gas flows inside the silencer box 2, where sound waves undergo multiple reflections, scattering, and absorptions, thereby significantly reducing noise energy. At the same time, the cooling tank 5 installed above the silencer box 2 effectively absorbs and dissipates heat energy generated by gas compression or friction, maintaining a stable box temperature and preventing high temperatures from damaging the sound-absorbing material or affecting the silencing performance. The silenced gas continues to flow along the internal path to the air outlet 20, and is finally discharged through the through-hole on the other side of the sound-absorbing box 1. During this process, the external sound-absorbing box 1 plays a further role in sound insulation and suppressing structural resonance, while the hinged box door 21 allows for convenient maintenance or replacement of parts inside the equipment, ensuring long-term stable operation of the system. The entire process achieves synergistic optimization of noise control, heat dissipation management, and stable output.

[0032] like Figure 2 , Figure 3 , Figure 4 As shown, the interior of the silencing housing 2 is provided with a first silencing chamber 7, a second silencing chamber 8, a third silencing chamber 9, a fourth silencing chamber 10, and a fifth silencing chamber 11 arranged sequentially from the air inlet 6 to the air outlet 20. The first silencing chamber 7, the second silencing chamber 8, the third silencing chamber 9, the fourth silencing chamber 10, and the fifth silencing chamber 11 are all separated by partitions.

[0033] When the noisy gas enters the silencer chamber 2 through the air inlet 6, the noise energy is reduced in each chamber in turn. The reduction is achieved through a control path of more than five levels. This not only isolates the straight-line propagation of sound waves, but also controls the gas flow rate and the direction of airflow disturbance, avoiding high-speed impact or airflow resonance. Finally, the noise intensity of the gas after the silencing treatment is significantly reduced, and then it is discharged through the air outlet 20. The whole process ensures smooth gas flow while achieving efficient, stable, and graded control of silencing.

[0034] Inside the silencer housing 2, on the side away from the air outlet 20, a first air inlet pipe 12 is fixedly installed. One end of the first air inlet pipe 12 is connected to the air inlet 6, and the other end is connected to the third silencer chamber 9. Several exhaust holes 13 are provided on one side of the first air inlet pipe 12, and these exhaust holes 13 are connected to the second silencer chamber 8. On one side of the third silencer chamber 9, opposite the first air inlet pipe 12, a second air inlet pipe 14 is provided. The other end of the second air inlet pipe 14 is connected to the fifth silencer chamber 8. The silencing chambers 11 are connected. A first return air pipe 15 is provided in the middle between the fifth silencing chamber 11 and the third silencing chamber 9. A second return air pipe 16 is provided in the middle between the third silencing chamber 9 and the second silencing chamber 8. A third return air pipe 17 is provided in the middle between the second silencing chamber 8 and the first silencing chamber 7. An air outlet pipe 18 is provided on the side of the silencing box 2 away from the air inlet 6. One end of the air outlet pipe 18 is connected to the first silencing chamber 7, and the other end of the air outlet pipe 18 is connected to the air outlet 20.

[0035] The high-temperature, high-pressure noise gas discharged from the gas turbine system first enters the first intake pipe 12 through the intake port 6. Inside the first intake pipe 12, the airflow is guided, and part of the gas sound energy diffuses into the adjacent second silencer 8 through several exhaust holes 13. The remaining main gas continues forward and enters the third silencer 9 through the end of the first intake pipe 12. In the third silencer 9, part of the airflow is guided by the second intake pipe 14 to the more distant fifth silencer 11. The fifth silencer 11 then returns the gas to the fourth silencer 10 through the first return pipe 15, which greatly prolongs the gas sound wave path and causes repeated disturbances in different structures, gradually attenuating the energy. The gas that directly enters the third silencer 9 from the first intake pipe 12 meets and collides with the gas that returns through the first return pipe 15 in the third silencer 9, thereby further weakening the sound wave energy.

[0036] Next, the gas flow enters the second silencing chamber 8 from the third silencing chamber 9 via the second return air pipe 16, merging with the part of the sound wave flow that previously entered directly from the exhaust port 13, forming a new round of disturbance and energy dissipation. After that, the overall airflow is guided to the first silencing chamber 7 at the front end, and introduced through the third return air pipe 17, where the final stage of low-frequency noise absorption is completed. Finally, the gas after the multi-stage silencing, disturbance, and attenuation is discharged through the exhaust pipe 18 that runs through each silencing chamber, and released to the external environment through the exhaust port 20. The entire structure ensures that the sound energy is dispersed in space, extended in the path, and disturbed in motion, so that the entire emission process not only effectively reduces noise, but also maintains the stability and smoothness of the fluid system.

[0037] like Figure 3As shown, a turbulence port is provided on one side of the middle part of the air outlet 18. The turbulence port is connected to the third silencer 9. Guide plates 19 are provided on both sides of the turbulence port. The two guide plates 19 are arranged in an outward V-shape. A smoke filter is fitted on one end of the air outlet 20.

[0038] When the gas turbine system is working, the gas is guided and attenuated by the aforementioned multiple silencers before finally entering the outlet pipe 18 and flowing towards the outlet 20. During this process, when the high-pressure gas flows through the middle of the outlet pipe 18, due to the design of the turbulence port, some of the airflow is naturally guided into the turbulence port and then re-enters the third silencer 9. This design forms a dynamic "return gas" mechanism, allowing residual noise energy to dissipate again, while slowing down the airflow speed and preventing the concentrated discharge of sudden noise. The outward-facing V-shaped guide plates 19 are located on both sides of the turbulence port. It can guide and stabilize the direction of the gas entering the turbulence inlet, so that it deflects into the silencer at a reasonable angle, preventing aerodynamic noise or back pressure in the pipe due to chaotic direction. At the same time, the included angle design of the guide plate 19 is conducive to the formation of pressure difference drive, enhancing the gas return guide capability and improving the turbulence back suction efficiency. When the remaining gas reaches the outlet 20 through the tail end of the outlet pipe 18, the smoke filter intercepts and purifies any particles and impurities that may be present in the gas, effectively reducing the emission of pollutants, ensuring air quality, and also extending the service life of the downstream exhaust system.

[0039] like Figure 1 As shown, reflectors 22 are provided on the inner side of the sound-absorbing box 1 and the inner side of the box door 21. The reflectors 22 are arranged in an inclined semi-circular shape. The interior of the reflectors 22 is provided with a sandwich layer, which is a sound-absorbing layer.

[0040] The noise generated when gas enters through the inlet 6 and passes through the multi-stage silencing chamber will cause sound wave reflections in different directions on the inner wall of the chamber and the door 21 area. The inclined semi-circular reflector 22 set on the inner side of the sound-absorbing chamber 1 and the inner side of the door 21 will cause the sound waves to scatter in multiple asymmetrical directions when they come into contact with each other, thereby avoiding the formation of linear strong reflections or resonant sound fields and weakening the energy of concentrated sound wave propagation. The tilt angle of the reflector 22 itself gives it good sound wave dispersion characteristics, especially effective in diffusing and weakening mid-to-high frequency noise. The internal interlayer is a sound-absorbing layer composed of high-efficiency sound-absorbing materials (such as glass fiber cotton, basalt wool, or polyurethane foam), which can further absorb the sound wave energy that has passed through while the sound waves lose energy when they come into contact with the surface of the reflector 22, thereby achieving deep noise reduction. This composite structure not only expands the effective silencing area, but also significantly improves the sound energy dissipation path and efficiency.

[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0042] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A low-noise exhaust apparatus for a combined cycle power plant of a combustion engine, characterized in that, include: A sound-absorbing box (1) is provided with a door (21) hinged on one side of the sound-absorbing box (1), and through holes are provided on both sides of the sound-absorbing box (1); A soundproof enclosure (2) is provided inside the sound-absorbing enclosure (1). An air inlet (6) is provided on one side of the soundproof enclosure (2), and an air outlet (20) is provided on the other side. The air inlet (6) and the air outlet (20) are respectively adapted to the through holes on both sides of the sound-absorbing enclosure (1). Cooling tank (5) is located above the soundproof box (2).

2. The low noise emission plant for combined cycle power generation of a combustion engine according to claim 1, characterized in that, The bottom surface of the silencing box (2) is fixedly installed with an mounting plate (3), and each of the four corners of the mounting plate (3) is provided with a positioning screw (4) which is fixedly connected to the bottom of the sound-absorbing box (1).

3. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 1, characterized in that, The interior of the silencing housing (2) is provided with a first silencing chamber (7), a second silencing chamber (8), a third silencing chamber (9), a fourth silencing chamber (10), and a fifth silencing chamber (11) in sequence from the air inlet (6) to the air outlet (20). The first silencing chamber (7), the second silencing chamber (8), the third silencing chamber (9), the fourth silencing chamber (10), and the fifth silencing chamber (11) are all separated by partitions.

4. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 3, characterized in that, A first air inlet pipe (12) is fixedly installed on the side of the silencing housing (2) away from the air outlet (20). One end of the first air inlet pipe (12) is connected to the air inlet (6), and the other end of the first air inlet pipe (12) is connected to the third silencing chamber (9). A plurality of exhaust holes (13) are opened on one side of the first air inlet pipe (12), and the plurality of exhaust holes (13) are connected to the second silencing chamber (8).

5. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 4, characterized in that, A second air inlet pipe (14) is provided on one side of the third silencing chamber (9) opposite to the first air inlet pipe (12). The other end of the second air inlet pipe (14) is connected to the fifth silencing chamber (11). A first return air pipe (15) is provided in the middle between the fifth silencing chamber (11) and the third silencing chamber (9). A second return air pipe (16) is provided in the middle between the third silencing chamber (9) and the second silencing chamber (8). A third return air pipe (17) is provided in the middle between the second silencing chamber (8) and the first silencing chamber (7). An air outlet pipe (18) is provided on the side of the silencing box (2) away from the air inlet (6). One end of the air outlet pipe (18) is connected to the first silencing chamber (7), and the other end of the air outlet pipe (18) is connected to the air outlet (20).

6. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 5, characterized in that, A turbulence port is provided on one side of the middle part of the air outlet pipe (18), and the turbulence port is connected to the third silencer cavity (9).

7. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 6, characterized in that, Guide plates (19) are provided on both sides of the turbulence port, and the two guide plates (19) are arranged in an outward V-shape.

8. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 7, characterized in that, A smoke filter is fitted at one end of the air outlet (20).

9. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 1, characterized in that, The inner side of the sound-absorbing box (1) and the inner side of the box door (21) are both provided with reflectors (22), and the reflectors (22) are arranged in an inclined semi-circular shape.

10. The low-noise emission equipment for combined cycle gas turbine power generation according to claim 9, characterized in that, The reflector (22) has an internal interlayer, which is a sound-absorbing layer.

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