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Coking method

A technology of coking tower and coking tower, which is applied in the field of non-catalytic thermal cracking, can solve the problems of aggravating the coking of heating furnace tubes, high viscosity of heavy coking wax oil, and shortening the start-up period of the device, so as to slow down the coking of furnace tubes and feed Effects of property improvement, inhibition of formation and deposition

Inactive Publication Date: 2013-01-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Some of these patents have suppressed the coking of the furnace tube of the heating furnace, prolonging the start-up period; some have also improved the yield of liquid products, especially the yield of coked wax oil, but there are problems such as the poor properties of the coked wax oil. Mainly manifested in heavy coker wax oil with high viscosity and high carbon residue
[0005] Patents CN101619237A and CN101619238A combined the vacuum distillation process with the delayed coking process, which increased the liquid product yield of the delayed coking unit and improved the properties of the heavy coking wax oil, but the quality of the feed in the radiant section of the coking furnace deteriorated, which aggravated the Coking of the furnace tube of the heating furnace, which will shorten the start-up period of the device

Method used

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Embodiment 1

[0028] The properties of the vacuum residue I from the vacuum tower of the atmospheric and vacuum device are shown in Table 1 and the cut point is the mixed oil of the bottom oil of the coking fractionation tower at 520 ° C, which is transported to the convection chamber and radiation chamber of the coking heating furnace for heating; heated to 410 After ℃, go to the visbreaking reactor, and carry out the visbreaking reaction under the conditions of 0.30-3.5Mpa pressure and cold oil residence time of 42min; the visbreaking reaction oil gas is then returned to the radiation chamber of the coking furnace for heating, and heated to 498 ℃, enter the coking tower for coking reaction; the generated oil and gas are quenched and then fractionated in the coking fractionation tower to obtain gas, gasoline fraction, diesel fraction and light wax oil fraction. The bottom oil of the coking fractionation tower is pumped out, and a part The oil and gas are washed, etc., and the other part is ...

Embodiment 2

[0032] The vacuum residue II from the vacuum tower of the atmospheric and vacuum device, the properties are shown in Table 1 and the mixed oil with the cut point of the bottom oil of the coking fractionation tower at 565°C enters the convection chamber and radiation chamber of the coking furnace for heating; heats to 400°C Afterwards, the visbreaking reactor is subjected to visbreaking reaction under the condition of 3.5Mpa pressure and cold oil residence time of 48min; the oil gas exiting the visbreaking reactor is returned to the radiation chamber of the coking furnace for heating, and after being heated to 495°C Go to one of the two coke towers for coking reaction; the generated oil and gas are quenched and then go to the coking fractionation tower for fractionation to obtain gas, gasoline fractions, diesel fractions and light wax oil fractions. The oil and gas are washed, etc., and the other part is mixed with atmospheric residual oil in the atmospheric and vacuum device, t...

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Abstract

The invention discloses a coking method. The method comprises the following steps: heating raw oil in a 360-450DEG C heating furnace, allowing the heated raw oil to enter a viscosity-reduction cracking reactor with the top pressure in the reactor of 0.30-3.5Mpa and stay for 6-210min, allowing the resultant reaction oil gas to enter the radiation chamber of a coking heating furnace, to be heated to 480-515DEG C and to enter a coking tower, quenching the coked high temperature oil gas, allowing the quenched oil gas to enter a coking fractionation tower, fractionating, returning parts of the tower bottom oil of the coking fractionation tower to the coking fractionation tower, allowing the other parts of the tower bottom oil to be mixed with a normal pressure residuum and then to enter a vacuum tower, and separating a vacuum residuum which can be adopted as a raw material for the viscosity reduction cracking. The method can increase the liquid product yield and improve the properties of heavy-coking gas oil.

Description

technical field [0001] The invention relates to non-catalytic thermal cracking of hydrocarbon oil in the absence of hydrogen, in particular to a coking process combined with visbreaking, vacuum distillation and delayed coking processes. technical background [0002] Delayed coking is an advanced processing technology that converts heavy oil into gas, light distillate oil, middle distillate oil, and coke through deep thermal cracking. It has the characteristics of complete decarbonization, simple process, mature technology, and low equipment investment. It has become one of the important processes in heavy oil processing technology. [0003] The pursuit goal of the delayed coking unit is to convert the heavy oil into liquid products in the maximum amount under the condition of ensuring production safety and long-term operation, and reducing the circulation ratio of the delayed coking unit is one of the important methods to increase the liquid yield. However, with the heavier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/04
Inventor 黄新龙陈建民王洪彬徐江华王少锋孙爱明胡艳芳李节王懿洛刘淑芳
Owner CHINA PETROLEUM & CHEM CORP
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