CASE HISTORY
TISCO - SINTER EXHAUST GAS FAN NOISE CONTROL

Tata Iron & Steel Company Limited awarded the contract to Acoustics India Private Limited for the Noise Control of Fan handling 9,80,000 m3/hr hot dust laden sinter gases at 1650 C driven by a 6500 KW motor. The noise control scheme is designed to bring down the noise level within 85dBA at a distance of 1m around the blower and the silencer is designed to offer minimum pressure drop.

AIPL carried out the design analysis and designed a system, which comprises of acoustic enclosure, Sinter fan discharge silencer, acoustic insulation of fan intake ducting and acoustic insulation of fan discharge transition ducting.

   
Fig. 1 shows the acoustic cladding material being assembled around the Blower casing


The silencer was designed to offer the following insertion loss.

Freq (Hz) 125 250 500 1000 200 4000
DIL dB 15 24 35 43 26 16

The Silencer is of absorptive type and rectangular in construction and installed in the discharge side of the Sinter Fan. The internals of the silencer comprised of splitter elements arranged in parallel, inside the rectangular steel casing. The internal splitter was designed for better aerodynamic performance and for minimum pressure drop.


Fig. 2 shows the discharge silencer having a dimension of 4200mm wide x4050mm height x 3300mm length weighing 14MT being dispatched from our factory.
Fig. 3 shows the acoustic insulation of discharge transition ducting and the discharge silencer installed in position.
Fig. 3
 
The inlet dampers connected to the hydraulic actuators posed a serious problem due to complex arrangement.

Fig. 4 shows a carefully designed acoustic treatment scheme for the damper actuators thereby offering noise reduction without compromising the functional requirement.

The whole system was installed at site and the noise level was measured as 83.6 dBA as against the guaranteed noise level of 85dBA.

Fig. 4

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