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Rod Baffle Heat Exchanger Design


The effect of heat transfer. Usually takes the shell in a turbulent state of fluid medium, which Re ≥ 4000, around the rod baffle heat exchanger is currently no unified, comprehensive and accurate formula, so the general press-type Re-djwp / ~, calculation, Re can be greater than 4000, of which the equivalent diameter d by fluid infiltration around the formula. . . 3 shell, tube-way media flow rate should be controlled within a certain range (see Table 1). Table 1 rod baffle heat exchanger suitable fluid velocity (m / s) 4.1.4 Tube length and tube diameter than the best control of Cambodia in the 8 to l2, the special circumstances not subject to this constraint. 4.2 Production 4.2.1 rod baffle elements (1) diameter rod baffle is generally 5-12mm, requires a more smooth surface. (2) According to the \placed between two parallel to each other on the baffle is usually fixed by welding, each of the two adjacent baffle baffle on the pole is usually perpendicular to each other. 4.2.2 baffle (1) of the baffle configuration shown in Figure 2, the baffle ring 24 on the barrel cone response filter dryer parts, recommended the following options: a. rod - for heat exchanger shell diameter ≤ 400ram, the tube length ≤ 1O00mm case. b. plate - for heat exchanger shell diameter> 400mm, tube length 1000 - 4000mm occasions. c. belt - for rod baffle heat exchanger diameter 4000mm occasions. (2) baffle spacing should normally be in the 80 - 450mm to choose the most commonly used mustache 150ram. 4.2.3 rod baffle tube sheet as a fixed effect is better, bundles greatly reduced vibration, which can be a thin tube plate. Practical application shows that a thin tube plate technology is reliable], usually technical parameters; P ≤ I. OMPa, pipe thickness I4mm. 4.2.4 draft tube guide flow tube structure shown in Figure 4, the arc transition area with usually molding, high cost. actually,[link widoczny dla zalogowanych], under certain conditions, the use of straight welding is also possible (see Figure 4b). h) ah fluorine connection cb) straight connector string together the guide sleeve 4 4.2.5 bundle structure indicate rod baffle heat exchanger because the special structure of tube arrangement in the tube sheet are arranged in a square,[link widoczny dla zalogowanych], the center distance is equal to the tube to ask tube diameter and the rod baffle diameter and,[link widoczny dla zalogowanych], rod baffle tube bundle diameter is usually stable as the criterion to choose the 5 a l2. 42.6 assembly related to the heat exchanger assembly is good or bad a normal life, the heat exchanger shell and baffle ring seam gap is too large, will affect the tube (beam) the stability of the induced vibration caused by damage to the equipment to ensure the quality of heat exchanger assembly, to provide some experience in the following: (1) fixed tube plate with the positioning rod and the \(2) wear control. Be installed in both ends of the tube through the tube sheet,[link widoczny dla zalogowanych], and fixed by welding and the connection tube and tube plate. (3) wear rod baffle and baffle rod welded to the \(4) shell in a special fixture on the sub-assembly. Also note: (1) avoid tube plate deformation, control the distance between two plate size of error is less than 5ram. (2) control tube plate, so that the \research has a long history, but because of heat transfer process is extremely complicated, both with regard to the dynamics, but also involves thermodynamics, phase change and other issues, it is still not fully suitable for all occasions and perfect used for engineering design formulas and charts, the content described in this article is based on results-based, comprehensive practice experience to get, basically to meet the design needs, is simple and practical, and reliable. 5.2 Baffle rod heat exchanger heat transfer effect is mainly derived from rod baffle shell and the \.3 rod baffle heat exchangers have a certain role of enhanced heat transfer limits, the best heat transfer enhancement effect of gas at a stretch,[link widoczny dla zalogowanych], but should recognize that: (1) When the fluid viscosity is 1.5 times of water, heat transfer enhancement effect was significantly reduced. (2) velocity of the fluid shell is a key parameter, the flow rate is too low, heat transfer enhancement effect decreased significantly. 5.4 rod baffle heat exchanger shape structure can be designed into a variety of forms, depending on the specific requirements.
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