Delayed coking steam-blast emptying system

Abstract

The invention belongs to the field of petroleum refining, and particularly relates to a delayed coking steam-blast emptying system. A large amount of high-temperature oil gas and steam which are generated in the steam-blasting and water feed coke cooling process in an original coke tower does not directly enter a steam-blast emptying tower for washing, and reversely contact with atomized acidic water or coke cooling water reversely sprayed by an atomizing nozzle mounted on the feeding line of the steam-blast emptying tower, the obtained cooled and washed mixed gas enters the steam-blast emptying tower, and reverse atomizing spraying cooling washing reduces the impact of the large amount of the high-temperature mixed gas to a baffle plate in the steam-blast emptying tower, reduces pollutedoil and coke powder in gaseous heavy components from the top of the steam-blast emptying tower to avoid waxing obstruction of a heat exchanger, and also can reduce coke powder and water in emptied gasin order to avoid frequent maintenance of a gas holder gas compressor.

Description

technical field [0001] The invention belongs to the field of petroleum refining, and in particular relates to a steam blowing and venting system for delayed coking. Background technique [0002] Delayed coking is the most widely used process for lightening heavy oil products. It is one of the important means of deep processing of heavy oil in refineries and plays an important role in my country's oil refining industry. [0003] The steam blowing and venting system of the delayed coking unit generally uses heavy oil such as wax oil or coke tower preheated waste oil as the closed circulation medium to contact cooling and absorb condensed oil process. The high-temperature (180-420°C) oil gas and steam generated during the coke tower blowing steam and feeding water cooling coke process enters the vent tower for washing, and the washed condensed oil and heavy oil as a circulating cooling medium are pumped out by the bottom pump of the vent tower and transported to After the cool...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies, and provide a new delayed coking steam blowing and venting system, which solves the impact of the sharp change of the mixed gas flow rate in the existing steam blowing and venting tower on the baffle in the tower; the heat exchange and cleaning effect in the tower Poor, the liquid phase load increases, the gas phase carries heavy components and coke powder, causing the heat exchange equipment tube bundle to be blocked by wax; the temperature at the top of the steam blowing and venting tower exceeds the standard, and the gas phase condensation cooling is incomplete, which increases the entrainment of gas phase coke powder and water; The temperature at the top of the tower exceeds the standard, and the oil-water separation effect is poor; the dirty oil at the bottom of the tower contains water, causing cavitation of the tower bottom pump; the waste oil is re-refined with water, resulting in production fluctuations in the coke tower, etc.

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