Gasification Daily Question: 2016-12-19 Process Analysis Question (5 points for participation, 15 points for a correct answer)
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Gasification Daily Question: 12-19-2016 – Process analysis question (5 points for participation, 15 points for a correct answer). What are the requirements regarding the leakage rate of oxygen silencers in coal gasification? What is the material used for these silencers and what is their function?
Designed according to process requirements; material is 304, to reduce venting noise
The noise level within a range of 1 meter is less than 85 dB. The main function of the oxygen vent silencer is to regulate the flow rate of oxygen during startup by using an oxygen flow control valve, thereby reducing noise. The material used is 0Cr18Ni9
When ordering a silencer, the following information must be provided: (1) exhaust volume in T/h, start-up pressure, and temperature. (2) Exhaust pipe outer diameter, wall thickness ； (3) The structure can be selected as either perforated or anti-spray-back composite type. Ordinary users choose composite silencers, which offer good noise reduction performance; the interior material is stainless steel, while the casing is made of carbon steel ； For connection, welding or flange butt joint can be selected ； The leg supports can be chosen in leg-style or ear-style configurations ；
To suppress the noise generated by high-pressure oxygen gas flow emissions. stainless steel
The oxygen silencer is of the impedance acoustic flow type. The material is stainless steel. The spectral characteristic data obtained from actual tests based on the noise sources at the installation site are used to determine the required sound attenuation levels in specific frequency ranges; these values serve as the main basis for designing the absorptive panel structure and the fluid channels. Narrow rectangular channels with extensive material finishes are employed to enhance the absorption effect. At the maximum noise level, the fan’s noise source typically has more than one spectral component, and different spectral bands require varying levels of noise reduction. This device features a resistive structure that reduces high and medium-frequency noise, as well as an absorptive structure that reduces medium and low-frequency noise. Additionally, the resistive channel includes both high-frequency and low-frequency noise reduction zones, thereby maximizing the noise reduction frequency range and achieving excellent noise suppression effects. The recommended limit for noise level is no more than 75-80 decibels.