Acoustic Intensity Mapping at a Natural Gas Compression Station Dr. Eng. Silviu Emil IONESCU 1, Dr. Eng. Valentin SILIVESTRU 1, Dr. Eng. Adina Cristina IONESCU 1, Dr. Eng. Ilie LAŢA 2, Eng. Ioan RUSU 2, Eng. Adrian OSTROVEANU 2, Eng. Dragos COSTEA 2 1 The Romanian Research and Development Institute for Gas Turbines COMOTI 2 The National Gas Transmission Company TRANSGAZ SA Medias Content Case study description Acoustic measurements plan Conclusions and future action plans to reduce the noise 1
Case study description outlet inlet compressor Images with the Turbo-Compressor Power Plant for Natural Gas Transportation outlet outlet 2
Acoustic measurements plan SPL measurement Noise analysis at different operating conditions N1 Gas Turbine Engine Speed N1 [rpm] 10000 10300 10500 10700 10900 11100 11300 11500 11700 11800 11900 12000 12100 12200 12300 Measurement surfaces Acoustic intensity mapping over a measured grid according to ISO 9614 with Acoustic Intensity Probe 3
Acoustic measurements plan Noise analysis at different operating conditions dba 111 110 109 108 107 106 105 104 103 102 101 100 99 N1 [rpm] 10000 10300 10500 10700 10900 11100 11300 11500 11700 11800 11900 12000 12100 12200 12300 N2 [rpm] 6050 6385 6667 6932 7230 7490 7809 8133 8468 8537 8723 8956 9164 9413 9636 N1 Gas Turbine Engine Speed N2 Centrifugal Compressor Speed 4
Important frequency domain at different operating conditions Acoustic analysis results 2007 N1 [rpm] N2 [rpm] F1x [Hz] F2x [Hz] 12600 12120 2626.0 5252.0 Acoustic analysis results 2009 N1 [rpm] N2 [rpm] F1x [Hz] F2x [Hz] 13020 13440 2912.0 5824.0 Acoustic analysis results 2011 N1 [rpm] N2 [rpm] F1x [Hz] F2x [Hz] 10000 6050 1310.8 2621.7 10300 6385 1383.4 2766.8 10500 6667 1444.5 2889.0 10700 6932 1501.9 3003.9 10900 7230 1566.5 3133.0 11100 7490 1622.8 3245.7 11300 7809 1692.0 3383.9 11500 8133 1762.2 3524.3 11700 8468 1834.7 3669.5 11800 8537 1849.7 3699.4 11900 8723 1890.0 3780.0 12000 8956 1940.5 3880.9 12100 9164 1985.5 3971.1 12200 9413 2039.5 4079.0 12300 9636 2087.8 4175.6 [ID=68] Average G2 - Recording - Noise Hz;(dB(A)[2.000e-05 Pa], RMS) 1310.73 70.0 2912.9 69.7 110 105 100 95 90 85 80 75 70 65 60 55 1 Important frequency domain 50 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5
Acoustic measurements plan Noise analysis at different operating conditions [ID=137] Average G4 12100_MIC1 - R 0 19531.3 24.9 [ID=141] Average G4 12200_MIC1 - R 0 19531.3 26.8 [ID=145] Average G4 12300_MIC1 - R 0 19531.3 28.7 110 Ec* 106.8 Ec* 109.0 Ec* 108.4 100 90 80 70 60 50 40 30 20 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 Comparative FFT analysis at different operating conditions Ec* 6
Acoustic intensity mapping over a measured grid according to ISO 9614 with Acoustic Intensity Probe Measurement surfaces 7
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Conclusions and future action plans to reduce the noise Resonant frequency domain [ID=85] G3 rezonanta_acc3 - Recording - Vibration Hz; (m/s², RMS 04.05e+00 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 24
Conclusions and future action plans to reduce the noise Action plans to reduce the noise Reduce the noise on the propagation path Reduce the noise at source Acoustic treatments for the outlet pipeline Modify the outlet pipeline resonance by changing the structure and thickness Introduce resonant cavities solutions to actively attenuate system frequencies which potentially can amplify the noise on the outlet pipeline Fundamental and applicative research for customized solutions based on acoustic absorption or insulation materials Fundamental and Applicative Research for System Redesign Solutions implementation to reduce the noise 25
Thank you for your attention! 26