The steam muffler is primarily based on the "small hole injection" theory combined with impedance expansion and sound absorption. Since the steam emission from boilers generally has a high flow rate and air flow noise, it is necessary to first expand the flow through a through-hole. After passing through multiple through-holes, the steam is then de-pressurized and de-stagnated in a resistive expansion chamber, and finally, the air flow is ejected through small holes.
After emission, the sound power of its various frequency bands has decreased, and the frequency of the sound pressure level has been elevated to above 20,000 Hz. The noise has been greatly reduced, but further noise reduction is required for some frequency bands of secondary noise.

We have expanded the outdoor installation with resistive acoustic棉 structures, and the steam muffler system is designed based on the frequency spectrum characteristics of the remaining noise announced by the pressure-reducing unit, to effectively absorb the remaining noise.
The noise reduction principle of the steam muffler involves replacing a large exhaust orifice with many small holes while maintaining the same exhaust volume. These small holes redirect high-frequency sound to the ultrasonic range, which is less sensitive to the human ear, thereby achieving the noise reduction goal.