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

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