Process and device for reducing coke powder of delayed coking fractionating tower

Abstract

According to a process and a device for reducing the coke powder of a delayed coking fractionating tower, provided by the invention, an oil-gas-wax oil heat exchange spray head, an oil-gas circulatingoil washing spray head, a gas-liquid separation distributor, a gas-liquid separation tank, a cyclone liquid remover and the like are arranged before reaction oil gas enters the fractionating tower; and the reaction oil gas is subjected to process treatment such as cooling, washing, coke powder capture, gas-liquid separation, liquid removal and coke powder removal, most coke powder carried in thereaction oil gas is washed into liquid-phase circulating oil, and the coke powder in the circulating oil is removed through a filter, so that the coke powder content of the reaction oil gas entering the fractionating tower is reduced. The quantity of oil gas entering the fractionating tower is reduced, the temperature of the oil gas is reduced, the linear speed of the oil gas at the lower part ofthe fractionating tower is reduced, a heat exchange plate for adjusting the circulation ratio at the lower part of the fractionating tower is saved, and the settling space of coke powder in the oil gas is increased; and a wax oil downward return spraying distributor is arranged to supplement the wash oil gas, so the coke powder content of fractionating tower side line and tower top products is further reduced. According to the invention, the amount of the coke powder entering the fractionating tower along with oil gas and the amount of coke powder entering the side line product along with oilgas can be effectively reduced, so that the product quality of a delayed coking device is improved, the operation period of the delayed coking device and downstream devices is prolonged, and the operation cost is saved.

Description

technical field [0001] The invention relates to a delayed coking technology in the field of petroleum refining, in particular to a process and a device for reducing coke powder of a delayed coking fractionation tower. Background technique [0002] Delayed coking process is an important low-quality heavy oil processing technology. Residual oil or heavy oil similar to residual oil, dirty oil, fuel oil, and crude oil are used as raw materials, which are quickly heated to a certain temperature (about 500°C) by a heating furnace and then enter coke The tower is a process in which a series of reactions such as cracking and condensation occur under suitable temperature and pressure conditions in the tower to generate gas, naphtha, diesel oil, wax oil, cycle oil components and coke. As a process of continuous production and discontinuous operation, there are generally at least two coke towers. When one coke tower is on-line coke generation, the other coke tower performs coke removal...

AI Technical Summary

Problems solved by technology

The main hazards of coke powder entering the fractionation tower with oil and gas are: (1) causing coking and clogging of the C tray of the coking fractionation tower, affecting the fractionation effect and product quality; resulting in an increase in the pressure drop of the tray, reducing the processing capacity of the device, and shortening the operating cycle of the device (2) cause coke powder to be carried in each side line product of the fractionating tower, coker gasoline and diesel oil are usually used as products or raw materials for downstream devices after hydrotreating, coker wax oil is usually used as raw materials for catalytic devices through hydrotreating, coker gasoline 3, Diesel oil 4 and wax oil 5 carry coke powder, pollute the catalyst of the hydrogenation reactor, affect the service time of the catalyst, and then affect the operation cycle of the hydrogenation unit, increasing production costs

(3) Coking rich gas 2 carries coke powder, one is to block the absorption tower, desulfurization tower tray or packing of the rich gas treatment system, and the other is to pollute the desulfurization agent of dry gas and liquefied gas desulfurization, which affects the desulfurization effect and increases the operation cost

(4) Increase the coke powder in the circulating oil, and the coke powder will fall into the bottom of the tower with the circulating oil, causing a large amount of coke powder to accumulate at the bottom of the fractionation tower, causing coking at the bottom of the tower, and even blocking the outlet at the bottom of the tower, causing the device to be forced to shut down; fractionation The coking oil at the bottom of the tower is used as the feed material of the heating furnace, and the coke powder content is high, which will accelerate the coking speed of the heating furnace tube and affect the operation cycle of the delayed coking unit

[0012] In short, coking high-temperature oil and gas carry a large amount of coke powder into the coking fractionation tower, which will not only affect the stable operation and product quality of the coking unit, but also affect the stable and long-term operation of the downstream processing equipment

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