双圆缺折流挡板的气体换热器

The gas-to-gas heat exchanger with double segmental baffles

双圆缺挡板换热器可视为两个半圆柱管壳式换热器的并联,壳程气体双进双出,折流挡板由月牙板、双圆缺板交替进行。讨论了台拉华-比尔方法在壳程传热膜系数计算中的特点,通过不满排和在折流板上开泄流孔提高壳程传热膜系数、降低壳程阻力。硫酸装置是腐蚀性、易结垢气体,污垢热阻的选取是其成败的关键,探讨了强化传热的优缺点。给出了实际换热器结构参数和换热性能的计算结果。

The heat exchanger with double segmental baffles can be considered as two semi-cylindrical shell-and-tube heat exchangers connected in parallel.The shell-side gas is double-in and double-out and the baffles comprise crescent and segmental plates arranged alternatively.The characteristics of the Delaware-Bell method in the calculation of the shell-side heat transfer coefficient,or film coefficient,was discussed.Arrangement of non-full tube passes and increasing the openings on the segmental baffles can increase the shell-side heat transfer coefficient and reduce the shell-side resistance.The sulphuric acid plant contains gases that are highly corrosive and can form deposit easily.The thermal resistance of the fouling is imperative to the efficiency of the heat transfer.The advantages and disadvantages of enhanced heat transfer were discussed.The calculated results of the heat transfer performance integrated the actual heat exchanger structural parameters were presented.