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Experimental study of the diffusion-controlled corrosion of copper in the bottom of a jet stirred reactor

机译：喷气式反应器底部铜扩散控制腐蚀的实验研究

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Abstract Jet stirred tank reactors are usually preferred to mechanically stirred tank reactors in the case of high pressure stirred tank reactors in order to avoid the mechanical problems inherent with mechanically agitated reactors. Owing to the impact force exercised by the fluid jet on the tank bottom, the tank bottom is subjected to severe corrosion. The aim of the present work is to address this problem using an accelerated system which simulates natural diffusion-controlled corrosion of metals. Diffusion-controlled corrosion of a fixed copper disc, at the bottom of a cylindrical tank, under a single phase forced jet flow of acidified dichromate solution was investigated. Variables studied were: physical properties of the solution, solution velocity through different diameters of jet nozzle, distance between the jet outlet nozzle and the copper disc surface; and the effect of using a drag reducing polymer. An overall correlation was obtained: Sh = 0.579 Sc 0.33 Re 0.975 (h/d) 0.049 valid for 850 < Sc < 1322, 1852 < Re < 5000 and 0.3 < h/d < 1.2. Addition of polyethylene oxide as a drag reducing polymer was found to diminish the rate of corrosion under single phase forced jet flow by an amount depending on the operation conditions.
机译：抽象的喷射搅拌罐反应器通常优选在高压搅拌釜反应器的情况下是机械搅拌的罐式反应器，以避免机械搅拌反应器固有的机械问题。由于流体射流在罐底部锻炼的​​冲击力，罐底部受到严重腐蚀。本作本作的目的是使用加速系统来解决这个问题，该系统模拟了自然扩散控制的金属腐蚀。研究了固定铜盘的扩散控制腐蚀，在圆柱形罐的底部，在酸化的二氯甲酸酯溶液的单相强制射流下进行。研究的变量是：溶液的物理性质，溶液速度通过不同直径的喷嘴，喷射出口喷嘴和铜盘表面之间的距离;使用阻力还原聚合物的效果。获得总相关性：SH = 0.579 SC 0.33 RE 0.975（H / D）0.049有效850

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