Crude oil distillation unit

Abstract

The invention relates to a crude oil distillation device, belonging to the technical field of oil refining. The crude oil distillation device comprises an atmospheric column, an atmospheric overhead oil circulating device, a cooling device and a product tank, wherein a plurality of column trays are arranged in the atmospheric column at intervals along the height direction; and the straight-run oil circulating device comprises an oil-gas conveying pump and an atmospheric overhead heat exchanger, the oil-gas conveying pump is communicated with an inner cavity of the atmospheric column, the atmospheric overhead heat exchanger is communicated with the oil-gas conveying pump, the tray located at the topmost position is communicated with the atmospheric overhead heat exchanger, and the tray located at the topmost position, the cooling device and the product tank are sequentially communicated. According to the crude oil distillation device, cold reflux circulation of the column top of the atmospheric column is omitted based on the prior art, so that the low-temperature effect caused by cold reflux can be effectively avoided, and corrosive substances in the atmospheric column can be reduced; and meanwhile, the under-deposit corrosion caused by revaporization of water is avoided, so that the normal working of the atmospheric column is guaranteed, the service life of the atmospheric column is prolonged, and the defects in the prior art are effectively made up.

Description

technical field [0001] The invention relates to the technical field of oil refining, in particular to a crude oil distillation unit. Background technique [0002] At present, the deterioration of crude oil quality is a trend faced by domestic and foreign refining and chemical enterprises. Corrosive impurities such as chlorine, sulfur, nitrogen, and acid contained in crude oil have brought many corrosion problems to crude oil processing, among which the corrosion problems caused by chlorides It is ubiquitous and poses a danger to the safe operation of oil refining equipment. The major corrosion problems in overhead systems of crude distillation units are caused by chlorides. "Chloride corrosion" mainly includes the following two mechanisms: 1) Hydrogen chloride corrosion; 2) Under-deposit corrosion. The parts of the crude oil distillation unit suffering from chloride corrosion are mainly concentrated in the upper five-layer tray of the atmospheric tower, the tower body and ...

AI Technical Summary

Problems solved by technology

The root cause of scaling and corrosion is often related to the selection of the basic configuration of the device. Once the configuration of the device is selected, even if the operating conditions of the device are changed and anti-corrosion agents are added, the problem of scaling and corrosion cannot be completely solved.

The top of the existing atmospheric tower generally has a top reflux system. This method has a series of disadvantages: first, the temperature is too low, causing hydrogen chloride dew point corrosion and salt formation; roof corrosion

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