Application of Vent Silencers
Vent silencers (exhaust silencers) are used in various industrial equipment to reduce noise generated during the discharge of air or gas into the environment. Sudden discharge processes can produce significant noise and contribute to environmental noise pollution. For example, in safety relief valves, when system pressure exceeds the allowable limit, gas is released into the atmosphere to restore pressure to a safe level. The noise generated during this process is primarily dependent on the pipeline pressure and the diameter of the outlet pipe.
In many industries, it is sometimes necessary to discharge working fluids such as gas or steam from high-pressure process lines into the atmosphere. This discharge may occur due to activation of safety relief valves, excess process flow rates, system start-up operations prior to reaching steady thermodynamic and flow conditions, or during the filling and emptying cycles of instrument air compressor tanks. In most cases, the pressure differential between the main process line and the ambient environment is high, causing the fluid velocity to become extremely high and potentially approach sonic velocity, which results in intense noise generation.
These silencers are designed using specialized computational design codes, and the acoustic performance of each component has been experimentally validated under laboratory conditions. The silencers are capable of achieving noise reductions of up to 40 dB.
Examples of vent silencers manufactured by the company are shown in Figure 1. Figure 1(a) illustrates a vent silencer equipped with four inlet nozzles and an annular baffle configuration. Figure 1(b) presents the smallest vent silencer, with a length of 15 cm. Figures 1(c) and 1(d) show two vent silencers featuring circular baffle arrangements with varying diameter configurations. The silencer shown in Figure 1(c) is a large-scale unit manufactured by the company, with a diameter of 3.2 meters, a length of 6.5 meters, and a total weight of 9.5 tons.
The primary end users of this product include refineries, petrochemical plants, power generation facilities, gas transmission and distribution industries, food processing industries, and steel manufacturing plants.