Pipe silencers are specialized noise-reduction devices for the steam emissions from thermal equipment such as boilers and steam turbines in power generation departments, widely used in industries like oil, chemical, and metallurgy. Their core function is to suppress the high-intensity noise (up to 130 decibels) generated by steam emissions, thereby reducing the sound pressure level to meet the requirements of the "Noise Hygiene Standards for Industrial Enterprises."
The equipment utilizes the micro-perforated plate noise reduction principle and a composite noise reduction technology featuring resistance, suppression, and absorption, combined with flow control, voltage reduction, and audio frequency adjustment to achieve noise reduction. The main structure includes an expansion chamber made of stainless steel and resistive sound-absorbing cotton, which can adapt to various steam parameters (pressure, temperature, and discharge) ranging from low pressure to supercritical, effectively handling a wide frequency range of noise and adjusting high-frequency sound waves to above 20,000 Hz. The product requires customization and selection based on steam parameters and pipeline specifications, and installation must follow technical specifications such as vertical fixation and setting expansion bends.
Product Features
Pipe silencers are primarily used for effectively muffling steam emissions from thermal equipment such as boilers and steam turbines in power generation departments. They are also widely employed in the steam emissions muffling and other gas exhaust emissions of industries such as oil, chemicals, metallurgy, and textiles. A silencer is a device that blocks sound transmission while allowing airflow to pass through, serving as a crucial measure for eliminating the dynamic noise of steam emissions. When assessing the quality of steam exhaust silencers, the following three aspects are mainly considered:
The noise attenuation of the pipeline muffler meets the requirements of the "Noise Hygiene Standard for Industrial Enterprises."
2. The adaptability of pipeline silencers; (i.e., to low-mid frequency bandwidth and high-temperature high-pressure conditions).
3. Structural performance of pipeline silencers (Reasonable dimensions, low cost, long lifespan, etc.).
The boiler steam in the power generation department is not only high temperature and high pressure but also has a wide frequency bandwidth. Simply relying on small-hole noise reduction is insufficient. The Zhuili Exhaust Noise Attenuator is developed based on the composite noise reduction principle of resistance, jet, and block. It features large noise reduction capacity, wide frequency bandwidth, and targeted design for various parameters (low, medium, sub-high, high, ultra-high, subcritical, and supercritical pressure) of different boilers and pressure vessel pipeline exhaust outlets. The noise reduction tube is made of stainless steel (1Cr18Ni9Ti, 12Cr1MoV) and is easy to manufacture and install.
Principle
The boiler exhaust silencer is manufactured based on the micro-perforated plate noise reduction principle. The steam排放 from power plant boilers typically has high flow rates, and high flow rates have the greatest impact on noise reduction for small holes. Therefore, we first need to control the flow, and then the steam that has been controlled enters the expansion chamber for further pressure reduction and noise reduction. After the steam is reduced in volume, it forms low-pressure steam that is ejected. During this process, the airflow is ejected through small diameter holes. After ejection, the sound power in various frequency bands has been reduced, and the sound pressure level frequency is pushed up to above 20,000Hz, significantly reducing the noise. However, secondary noise at certain frequencies still requires further noise reduction. We add a resistive sound-absorbing cotton structure outside the expansion chamber, which is designed based on the frequency spectrum characteristics of the remaining noise emitted by the pressure reduction body, to effectively absorb the remaining noise. After the user installs it according to specifications, the total noise reduction should reach 30-60 decibels, meeting the required standards.