Abstract: Taking the re-contact air cooler of a certain refining and chemical enterprise's continuous reforming unit as the research object, the causes of leakage in the tube bundle of the re-contact air cooler of the continuous reforming unit are analyzed through actual analysis and simulation calculation, and corrosion protection measures are proposed. The results show that the crystallization temperature of NH4Cl in the re-contact air cooler of the continuous reforming unit is 80-100°C, which is within the temperature range of the inlet and outlet of the re-contact air cooler. NH4Cl will crystallize and deposit on the inner wall of the tube bundle in the middle and outlet of the re-contact air cooler, and will absorb water and deliquesce during the shutdown period, causing corrosion under the scale. Therefore, during the shutdown period, measures such as washing with sodium bicarbonate aqueous solution and filling the tube bundle of the re-contact air cooler with nitrogen for protection can be taken to prevent the corrosion under the NH4Cl scale. At the same time, pressure should be applied to the tube bundle of the re-contact air cooler to ensure that there is no leakage.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">continuous reforming unit, re-contact air cooler, tube bundle leakage, NH4Cl, corrosion, simulation calculation, protective measures

摘要： 以某炼化企业连续重整装置再接触空冷器为研究对象，通过实际分析和模拟计算，对连续重整装置再接触空冷器管束泄漏原因进行分析并提出腐蚀防护措施。结果表明：连续重整装置再接触空冷器中的NH4Cl 结晶温度为80～100℃，处于再接触空冷器出入口温度区间内，NH4Cl 在再接触空冷器中间及出口部位会结晶沉积于管束内壁，停工期间会发生吸水潮解腐蚀。因此，停工期间可通过碳酸氢钠水溶液水洗、再接触空冷器管束充氮气保护等措施来防止产生NH4Cl垢下腐蚀，同时还需对再接触空冷器管束进行打压，确保管束无泄漏。

关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">连续重整装置, 再接触空冷器, 管束泄漏, NH4Cl, 腐蚀, 模拟计算, 防护措施