Spiral heat exchanger

タイトルまたは説明

In shell and tube heat exchanger, the shell usually a weak link. Common segmental baffle to shell fluid was "Z" shaped flow separator and the shell, resulting in the formation of stagnant zones, there are bypass fluid flow, leakage flow effects and the relatively high back-mixing. The dead zone caused by increased shell scale, bypass flow, leakage flow and back mixing makes the average temperature and reduced distortion. Therefore, the segmental baffle heat exchanger heat transfer coefficient is low, the high pressure drop, it is difficult to meet the requirements of high thermal efficiency, Guchang for other types of heat exchanger is replaced (such as compact plate heat exchanger). 
       Ordinary baffle geometry improvements, is the first step in the development of the shell. Czech first proposed a helical baffle heat exchanger new program, then, ABB bought the U.S. patent and helical baffle heat exchanger manufacturing. Fluid dynamics and heat transfer test results show that the helical baffle heat exchanger to overcome common segmental baffle heat exchanger main drawback, is an ideal shell supporting structure bundle. 
       Spiral baffle design principle is simple: the circular cross section of the special plates installed in the "proposed Helical System", each baffle shell heat exchanger in the total cross-section of a quarter, its inclination towards axis of heat exchanger, ie heat exchanger to maintain a tilt axis. Adjacent baffle surrounding phase, and the External Department into a continuous spiral.Axial baffles overlap, For narrow to support the pipe span, can also be double-helical baffle design. 
       Helical baffle structure can meet the relative width of the process conditions. This design has great flexibility, for different operating conditions and choosing the best helix angle, can be divided to choose a single or double helical baffle baffles. If we helical baffles and enhanced tube with, can further enhance the overall heat transfer coefficient.