I own a sizable drying system used for drying polymer products in crumb form. The dryer beds vibrate on 6 feet by 20 feet long perforated beds, similar to a large air hockey table stroking at a 45-degree angle and 700 CPM. There are large hoods placed over the beds that operate under vacuum to collect the air from the crumb, allowing for the collection of hydrocarbons. The movement of the beds causes the stationary hoods to act like large pistons, with pneumatic pulsation impacting both the hoods and downstream cyclones. The vibrations are so intense that they are affecting structural steel 200 feet away. Despite conducting vibration studies that ruled out natural frequencies, I am in need of a large pulsation absorption system to mitigate the pressure pulses within the hoods. The hoods measure 6 feet wide by 20 feet long by about 6 feet high, while the downstream ductwork is 36 inches in diameter. This project requires a specialized solution, and I am seeking suggestions for a suitable system. Any recommendations will be greatly appreciated.
To effectively address the sound pressure levels in your environment, the first step would be to analyze the dominant frequency, which is commonly searched as 11.7 Hz. Subsequently, a thorough examination of the duct system should be conducted to identify potential sources of acoustic resonance. Given the wavelength of approximately 94 feet, it is important to assess the duct length for possible resonance issues, considering factors such as end-conditions. Furthermore, a detailed evaluation of the system for other acoustical characteristics is recommended. To mitigate noise and pulsations, various noise control methods can be implemented, including modifying the excitation frequency, utilizing tuned duct side branches, incorporating Hemholtz resonators (if applicable), or installing perforated plates or small tubes in baffles. As a qualified Noise Control Engineer, I am here to assist you in addressing any noise-related concerns. For further inquiries, feel free to reach out to me at w_f_strong {at} msn [dot] com.
Sounds like you have quite the complex situation on your hands. Since you are dealing with such large vibrations and the resulting disturbances, I would recommend consulting with an engineering firm that specializes in vibration control and mitigation. They may suggest methods such as installing vibration dampeners or isolators depending on the specifics of your setup. You might also want to consider redesigning the hood system to be self-dampening. A detailed structural analysis could also identify areas that could be strengthened to better withstand the vibrations. Try reaching out to companies like Sentek Dynamics or TMC; they specialize in vibration isolation systems and might be able to provide an innovative solution. Good luck!
From your description, it seems a custom-engineered pulsation damping solution might be your best bet here. Pulsation dampeners can effectively diminish the harmful effects of vibrations and pressure spikes. They work by reducing the velocity of the pressure pulse, converting its kinetic energy into potential energy, thus muffling the energy wave. However, the unique specifications of your setup may necessitate a bespoke system design. If you haven't engaged with them already, it might be helpful to consult with an engineering firm that specializes in systems designed to address pulsation control and shock suppression. They would be most familiar with the complex dynamics of such a system and could provide you with a tailored solution.
This sounds like a challenging yet fascinating problem. The sheer size of your operation points to the need for a large-scale, customized solution. I'm no expert in industrial drying, but I've heard good things about pulsation dampeners in similarly complex installations, as they can absorb and minimize pressure fluctuations. It might be also beneficial to explore advanced engineering solutions such as vibration isolation mounts or custom dampening panels to mitigate some of that massive vibrational energy. Encountering a customized system will likely require collaboration with a company that specializes in this sort of machinery. They should be able to provide a more precise solution based on a complete assessment of your specific situation.
It sounds like you have a complex system on your hands! For large pulsation absorption, you might want to consider using dampers specifically designed for pulsation control, like tuned mass dampers or even expansion joints that can help absorb and dissipate vibrations before they reach the structural steel. Another option could be integrating a custom-built resonator system tailored to your specific frequency range to mitigate those pressure pulses. It might also be beneficial to involve an acoustic engineer or vibration specialist who can analyze the system and provide a more precise solution. Good luck!
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Answer: - The drying system is used for drying polymer products in crumb form, with vibrating beds and vacuum-operated hoods to collect air and hydrocarbons.
Answer: - The intense vibrations from the beds are affecting structural steel located 200 feet away from the system.
Answer: - The hoods collect air from the crumb and act like large pistons due to pneumatic pulsations, impacting downstream cyclones. A pulsation absorption system is required to mitigate pressure pulses within the hoods.
Answer: - The hoods measure 6 feet wide by 20 feet long by about 6 feet high, while the downstream ductwork is 36 inches in diameter.
Answer: - Yes, vibration studies have been conducted to rule out natural frequencies as the cause of the intense vibrations affecting the surrounding structure.
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