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This paper analyzes a horizontal conventional double pass shell and tube heat exchanger with a focus on several special features. This includes an overview of how its distribution pressure does not require a steam regulating valve or steam control valve. Next, the paper discusses the impact of using a higher temperature steam to reduce the heat exchanger size. Then, the paper addresses the results of providing condensate sub cooling in a single heat exchanger. Additionally, the paper addresses the impact of using a discharge control valve to flood a heat exchanger to modulate capacity, which may eliminate or minimize water hammer. Various other aspects of this system are evaluated and salient literature on the topic is cited and reviewed. The paper concludes by stating that maintaining water velocity is the best method of improving heat exchange and in avoiding the build-up of deposits and fouling.
One Shell Pass and One Tube Pass
One Shell Pass and One Tube Pass
From the Paper:"The work of Driedger (2000) entitled: "Controlling Shell and Tube Exchangers" published in the Journal of Hydrocarbon Processing states that shell and tube heat exchangers are "among the most confusing pieces of equipment for the process control engineer." Driedger states that the principle of operation of the shell and tube heat exchanger is "simple enough: Two fluids of different temperatures are brought into close contact but are prevented from mixing by a physical barrier. The temperature of the two fluids will tend to equalize. By arranging counter-current flow it is possible for the temperature at the outlet of each fluid to approach the temperature at the inlet of the other. The heat contents are simply exchanged from one fluid to the other and vice versa. No energy is added or removed."
"The heat demands of the process are variable as well as is the heat content of the two fluids therefore the design of the heat exchanger must be "for the worst case and must be controlled to make it operate at the particular rates required by the process at every moment in time." (Driedger, 2000) Furthermore, the heat exchanger is variable and its characteristics..."
Sample of Sources Used:
- Double pass http://www.freepatentsonline.com/5203405.html
- ASME Boilers and Pressure Vessels Code, Section VIII, Pressure Vessels, Division 1, Unfired Pressure Vessels, Parts UG-125 to 136, Pressure Relief Devices. Online available at: http://www.asme.org/catalog/
- Standards of the Tubular Exchanger Manufacturers Association (nd) Online available at: http://www.tema.org/
- API STD 661, Air-Cooled Heat Exchangers for General Refinery Service (nd) Online available at: http://www.cssinfo.com/apigate.html
- API STD 660, Heat Exchangers for General Refinery Service (nd) Online available at: http://www.cssinfo.com/apigate.html
Cite this Research Paper:
Shell and Heat Tube Exchangers (2012, June 11) Retrieved September 23, 2019, from https://www.academon.com/research-paper/shell-and-heat-tube-exchangers-151479/
"Shell and Heat Tube Exchangers" 11 June 2012. Web. 23 September. 2019. <https://www.academon.com/research-paper/shell-and-heat-tube-exchangers-151479/>