How to implement vibration reduction methods for reaction vessels?
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This post was last edited by yxmqh on 2009-10-10 22:09. The reaction tank is located on the second floor, and vibrations are generated during mixing. The civil engineering design did not take into account the vibration loads from the reactor, resulting in damage to the ground-floor structure. Now we want to implement some shock absorption measures for the mixing tank on the second floor. I’m from a process engineering background, and I’m not sure where to start I would like to ask if anyone has any professional books or materials that I could refer to?
Thank you. I want to resolve it theoretically first, and then consider what specific measures to take. Simply put, the method used isn’t convincing at all.
Install rubber shock absorbers between the reactor vessel’s legs and the floor, and reinforce and repair the damaged floor slabs.
Vibration is mainly caused by two factors: 1. The rotational frequency of moving equipment such as mixing devices or pumps coincides with the natural frequency of their rotating components, resulting in resonance； 2. The stiffness of the connection between the tank and the moving equipment, or between the tank and the ground, is insufficient. The former is mainly due to the following reasons: 1) The bolts at the bearing seats of the mixing device, couplings, or at the pump connection points are not properly tightened ； 2). The deflection of the stirring shaft or pump boat is insufficient ； 3) The balance of the impeller does not meet the requirements. 4) The straightness of the shaft is compromised (this occurrence is rare, but it can happen) ； 5) There are impacts of a certain frequency near the impeller, or the impeller is in a certain state relative to the liquid surface ； For the above reasons, the design manufacturer must carry out calculations based on the specific operating conditions, or provide the relevant manufacturer with all the important parameters that affect these conditions, such as liquid density, viscosity, power, rotational speed, specific parameters of the impeller, cantilever length, shafting conditions, liquid level, tank dimensions, and material properties. Only then can the manufacturer offer you an accurate renovation plan. The latter can measure the torsional deformation at the connection point to determine the modification plan. Scientific modification not only improves efficiency but also reduces costs. Never seek convenience by being too lazy to take measurements when providing parameters, thus forcing the manufacturer to guess or allowing you to decide on a figure arbitrarily; this can not only cause problems for you but also result in unnecessary losses for the company. .
How is the fixed frequency of rotating components determined?