[Q&A Question 112] 2017.04.22
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【Q&A Question 112】April 22, 2017: What is the purpose of adding baffles to the shell side of a heat exchanger? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Mainly: it increases the flow velocity or turbulence level of the fluid to improve heat transfer efficiency, while the baffle plates also serve to support the heat exchange tubes. Scoring criteria: 2 Wealth points for incorrect attempts; 3–8 points for *incomplete* answers. 10 Wealth points for correct answers, provided along with a detailed explanation; 15–20 Wealth points if the answer is correct but lacks sufficient details. Please score according to these criteria. 2017 Q&A Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates starting now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Petrochemical Sector – “Creative Ideas for Energy Saving” campaign (sponsors sought; highest returns ever) http://bbs.hcbbs.com/thread-1666758-1-1.html Sponsors are being sought for this campaign; those interested can contact the event organizer. Petrochemical deep processing edition – the event to share pictures of chemical equipment has started! Huge amounts of wealth, as well as HCH coins, are waiting for you to claim them: http://bbs.hcbbs.com/thread-1760733-1-1.html. Notice regarding the collection of chemical engineering technical materials in the “Petroleum and Chemicals Section”: http://bbs.hcbbs.com/thread-1614796-1-1.html (Source: HCH Chemicals Forum)
Increase flow rate, increase surging, extend the process length, improve heat exchange efficiency, fix the tubes,
Increase fluid turbulence, expand the heat exchange area, and improve the heat exchange efficiency!
Its purpose is to prolong the flow time of the fluid in the shell side as much as possible, increasing the heat exchange time and thereby improving the heat exchange efficiency
Plates used to change the flow direction of fluids, commonly employed in the design of the fluid channels in shell-and-tube heat exchangers; the number of baffle plates is determined based on the properties and flow rate of the fluid, as well as the size of the heat exchanger. Baffles are installed in the shell side; they not only improve heat transfer efficiency but also serve to support the tube bundle.
Adding baffle plates is primarily to guide the fluid in the shell side, preventing short circuits, and at the same time to increase its velocity as much as possible (within the allowable pressure drop range), in order to achieve better heat transfer and reduce scaling. In horizontal heat exchangers, it also serves to support the tubes and prevent them from sagging or being damaged by vibration.
Adding baffle plates is primarily to guide the fluid in the shell side, preventing short circuits, and at the same time to increase its velocity as much as possible (within the allowable pressure drop range), in order to achieve better heat transfer and reduce scaling. In horizontal heat exchangers, it also serves to support the tubes and prevent them from sagging or being damaged by vibration.
Increase the heat exchange area to improve heat exchange efficiency
To achieve counterflow heat transfer, in addition to using multiple tube passes on the tube side, baffle plates are often employed on the shell side to facilitate counterflow heat transfer and thereby increase the heat transfer coefficient
Answer: Adding baffle plates is mainly to guide the fluid in the shell side, prevent short circuits, and at the same time increase its velocity as much as possible (within the allowable pressure drop range) in order to achieve better heat transfer and reduce scaling. In horizontal heat exchangers, it also serves to support the tubes and prevent them from sagging or being damaged by vibration.
Baffles are used in the shell side of the heat exchanger to facilitate counterflow heat transfer and thereby improve the heat transfer coefficient.