关键词: 延迟焦化, 分馏塔, 结盐, 腐蚀, 顶循除盐

Abstract: As the crude oil becomes heavier and worse in quality, the quality of raw materials in delayed coking unit decreases correspondingly and the salt content in raw materials increases day by day. Salt deposits in the upper tray and top circulation system of coking fractionator occur during production and operation, resulting in such problems as lower tray efficiency of coking fractionators, overlapping distillation range of side products, corrosion leakage of cooler tube bundle, top circulation pump evacuation and so on. These problems affect the normal and safe operation of the device. In this paper, the causes of salt deposition on top of coking fractionator are analyzed in combination with practical production problems, and several treatment methods are put forward, especially the application of new top-circulating-oil desalination facility is analyzed in detail, and the following solutions are proposed.

Key words: delayed coking, fractionator, salt deposition, corrosion, top-circulating-oil desalination