Abstract
Heat exchanger is a universal process equipment, which is widely used in chemical industry, oil refining, thermal power and other industries. Shell-and-tube heat exchangers often fail prematurely due to flow-induced vibration. In this paper, aiming at the problem of severe vibration of shell-and-tube heat exchanger in an enterprise, the vibration acceleration sensors are used to measure the vibration of shell and tube side of heat exchanger. Through the analysis of the measurement results, it is found that when the flow rate on the shell side of the heat exchanger is greater than 50000 Nm3/h, the flow-induced vibration of the tube bundle occurs, and the vibration frequency is 57Hz, which is close to the natural frequency of the tube bundle. And the greater the flow rate on the shell side, the more intense the vibration. In order to reduce the vibration of heat exchanger, the damping measure of inserting baffles between tubes is adopted.
Highlights
Shell-and-tube heat exchanger is a widely used process equipment in petroleum, chemical, food and pharmaceutical industries
When the fluid of the shell side flows through the tubes of the heat exchanger, an alternating Karman vortex street will be formed downstream of the tubes, resulting in a periodically varying exciting force, which is perpendicular to the fluid flow direction and leads to tube vibration
Ji et al [6, 7] discussed the influence of fluid velocity and structural parameters of shell side on flow-induced vibration response of elastic tube bundle
Summary
Shell-and-tube heat exchanger is a widely used process equipment in petroleum, chemical, food and pharmaceutical industries. There are three main reasons for tube bundle vibration induced by fluid in shell-and-tube heat exchanger, namely vortex shedding, fluid-elastic instability and turbulent buffeting [1]. Ji et al [6, 7] discussed the influence of fluid velocity and structural parameters of shell side on flow-induced vibration response of elastic tube bundle. Weaver and Parrondo [14] conducted experimental study on the fluid-elastic instability of tube bundle of multi span heat exchangers, and conservatively estimated the critical velocities of. Bao et al [16] theoretically deduced the fluid-elastic excitation on the shell side of the heat exchanger, and analyzed the vibration of the tube bundle at different positions by numerical simulation method.
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