CN-121976863-A - Exhaust silencing structure for gas turbine generator set

CN121976863ACN 121976863 ACN121976863 ACN 121976863ACN-121976863-A

Abstract

The invention provides an exhaust silencing structure for a gas turbine generator set, which is characterized in that an expansion joint, an exhaust expansion section, a silencing elbow and an exhaust silencer are sequentially connected along the airflow direction, an inner interlayer of the exhaust expansion section and the silencing elbow is filled with a sound absorbing material, an arc-shaped guide vane in the silencing elbow is matched, a silencing layer on the inner wall of the exhaust silencer and a plurality of silencing cores in the inner part are combined to construct a synergistic coupling silencing system, the problems of increased exhaust resistance and reduced thermal efficiency of the generator set caused by a complex resistance structure are avoided, and a whole-course progressive silencing channel is formed by matching the silencing function of a front part and a rear silencer, so that the characteristic of broadband noise of the exhaust of the gas turbine is pertinently adapted, the airflow disturbance and vortex regenerated noise are reduced, the high-efficiency suppression of high-strength broadband exhaust noise is realized, the running efficiency of the generator set is ensured, and the synergistic performance of the integral design of the system is optimized.

Inventors

JIANG KUN
YU KAILIANG
ZHENG XIA
FENG LIJIE
Liang Yuefu
MA YUANYUAN

Assignees

北京动科瑞利文科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. The exhaust silencing structure for the gas turbine generator set is characterized by comprising an expansion joint, an exhaust expansion section and a silencing elbow which are sequentially connected along the airflow direction, wherein the expansion joint is connected with an exhaust injection section of a gas turbine, the outlet end of the silencing elbow is connected with an exhaust silencer, sound absorbing materials are filled in an interlayer inside the exhaust expansion section and the silencing elbow, an arc-shaped guide vane is arranged in the silencing elbow, a silencing layer is arranged on the inner wall of the exhaust silencer, and a plurality of silencing cores are arranged in an area surrounded by the silencing layer inside the exhaust silencer.
2. The exhaust silencing structure for a gas turbine generator set according to claim 1, wherein the exhaust silencer further comprises a silencer shell, two supporting components and a contraction section, wherein two ends of the silencer shell are respectively connected with the silencing elbow and the contraction section; The silencer comprises a silencer shell, a silencing layer, two support components and a plurality of silencing cores, wherein the silencing layer is arranged on the inner wall of the silencer shell and comprises an aluminum silicate cotton layer clung to the inner wall of the silencer shell and a first pore plate covering the inner side of the aluminum silicate cotton layer to form an annular silencing channel, the two support components are respectively arranged at the upper end and the lower end of the inner part of the silencer shell, and the silencing cores are arranged between the two support components in a central annular array.
3. The exhaust silencing structure for a gas turbine generator set of claim 2, wherein the perforation rate of the first orifice plate increases in a gradient along the direction of the gas flow.
4. The exhaust silencing structure for a gas turbine generator set as claimed in claim 2, wherein each of the silencing cores comprises a second orifice plate enclosing a cylinder shape, and is internally filled with aluminum silicate wool.
5. The exhaust silencing structure for a gas turbine generator set according to claim 4, wherein a flow guiding wind head in a shape of a circular truncated cone is arranged at the bottom of the second orifice plate.
6. The exhaust silencing structure for a gas turbine generator set as claimed in claim 4, wherein the density of aluminum silicate wool filled in the silencing core at the center is lower than that of aluminum silicate wool filled in the silencing core at the periphery.
7. The exhaust silencing structure for a gas turbine generator set as claimed in claim 4, wherein the diameter of the silencing core at the center is larger than the diameter of the silencing core at the periphery.
8. The exhaust silencing structure for a gas turbine generator set as claimed in claim 2, wherein the support assembly comprises a support frame and a support ring, the support frame being internally provided with a cooling passage for circulating a cooling medium, and the silencing core being fixed at an end portion thereof to the support ring.
9. The exhaust silencing structure for a gas turbine generator set according to claim 2, wherein a temperature sensor and an acoustic sensor are installed outside the exhaust silencer, inside the silencing layer, inside each of the silencing cores and at an outlet of the exhaust silencer, and are connected to a control system of the generator set.
10. The exhaust silencing structure for a gas turbine generator set as claimed in claim 1, wherein the inlet end section of the exhaust expansion section is circular, the outlet end section is square, the diameter of the circular end section is smaller than the side length of the square section, and the expansion angle of the exhaust expansion section is 8 ° -12 °.

Description

Exhaust silencing structure for gas turbine generator set Technical Field The invention relates to the technical field of auxiliary equipment of gas turbines, in particular to an exhaust silencing structure for a gas turbine generator set. Background The gas turbine generator set is used as high-efficiency and flexible power generation equipment and is widely applied to the fields of power grid peak shaving, distributed energy sources, data center standby power supplies and the like. However, during operation, high temperature and high velocity exhaust gases from gas turbines produce extremely high intensity, broad spectrum noise, typically up to 120 db or more. The noise not only causes serious pollution to the surrounding environment and violates environmental protection regulations, but also seriously affects the physical and mental health of operation and maintenance personnel. In order to meet environmental requirements and improve operating environments, gas turbine generator sets must be equipped with efficient exhaust muffler systems. The existing exhaust silencing system of the gas turbine generator set has the following technical bottlenecks: The contradiction between the sound-deadening efficiency and the power generation efficiency, in order to pursue a high sound-deadening amount, conventional silencers often employ a complicated resistive structure (such as a thick sound-absorbing material) or add a resistive structure (such as a plurality of resonance chambers), which inevitably increases the exhaust resistance. The increase of the exhaust back pressure directly leads to the reduction of the thermal efficiency of the gas turbine, reduces the output power of the generator set, increases the fuel consumption and runs counter to the high-efficiency economic target pursued by the power generation industry. The noise elimination frequency band is not matched with the actual noise characteristic, and the exhaust noise of the gas turbine has a broadband characteristic, wherein the medium-low frequency noise has strong penetrability and great treatment difficulty. The existing muffler is effective for high-frequency noise or single low-frequency peak, and lacks systematic design aiming at broadband noise characteristics of the gas turbine, so that the comprehensive noise elimination effect is not ideal. The system components are designed in isolation, and lack of synergistic effects, namely the expansion section, the silencing elbow and the silencer in the exhaust system are often designed and purchased as independent components, and lack of overall optimization. For example, an poorly designed expansion section can cause uneven airflow distribution and generate vortex regeneration noise, and an elbow without diversion can generate huge local resistance loss and vortex noise, which not only counteracts part of the effect of the silencer, but also additionally increases the total resistance of the system and further influences the power generation efficiency. Therefore, how to provide an exhaust system which can realize broadband efficient noise elimination and reduce exhaust resistance to the maximum extent so as to ensure efficient, economical and environment-friendly operation of a gas turbine generator set is a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide an exhaust silencing structure for a gas turbine generator set, which can reduce exhaust resistance while silencing. According to the purpose, the invention provides an exhaust silencing structure for a gas turbine generator set, which comprises an expansion joint, an exhaust expansion section and a silencing elbow, wherein the expansion joint, the exhaust expansion section and the silencing elbow are sequentially connected in the airflow direction, the expansion joint is connected with an exhaust injection section of a gas turbine, the outlet end of the silencing elbow is connected with an exhaust silencer, sound absorbing materials are filled in inner interlayers of the exhaust expansion section and the silencing elbow, an arc-shaped guide vane is arranged in the silencing elbow, a silencing layer is arranged on the inner wall of the exhaust silencer, and a plurality of silencing cores are arranged in a region surrounded by the silencing layer. Further, the exhaust silencer further comprises a silencer shell, two support assemblies and a contraction section, wherein two ends of the silencer shell are respectively connected with the silencing elbow and the contraction section; The silencer comprises a silencer shell, a silencing layer, two support components and a plurality of silencing cores, wherein the silencing layer is arranged on the inner wall of the silencer shell and comprises an aluminum silicate cotton layer clung to the inner wall of the silencer shell and a first pore plate covering the inner side of the aluminum silicate cotton layer to form an annular silencing channel, the two