Method and system for improving stability of needle coke production process

A production process and production method technology, which is applied in the field of needle coke production process stability control, can solve the problems of inability to ensure the proper operating range of the pressure control system, wide adjustment range of the pressure control system at the top of the tower, and large fluctuations in the processing capacity of the fractionation system. problems, to achieve the effect of stabilizing control, eliminating adverse effects, and reducing the operating range

Active Publication Date: 2021-07-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the whole reaction cycle, the output of oil and gas at the top of the coke tower fluctuates greatly, and the adjustment range of the pressure control system at the top of the tower is wide, which cannot ensure that the pressure control system is always in the proper operating range; the processing capacity of the fractionation system fluctuates greatly, and the separation effect is poor, which affects the operation at the same time stability

Method used

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  • Method and system for improving stability of needle coke production process
  • Method and system for improving stability of needle coke production process
  • Method and system for improving stability of needle coke production process

Examples

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Embodiment 1

[0062] Example 1 Using the method provided by the present invention, the desolidified catalytic oil slurry is mixed with hydrogen and enters the hydrogenation reaction zone. The hydrogenation catalyst brand is FZC-34 (developed by Fushun Petrochemical Research Institute), and the hydrogenation treatment conditions are: The reaction temperature is 385°C, the reaction pressure is 8MPa, the volume ratio of hydrogen to oil is 1000, and the liquid hourly space velocity is 0.8h -1 ; The obtained hydrotreated oil is sent to the delayed coking reaction system, the outlet temperature of the heating furnace is 450°C-510°C, the coke tower adopts pressure swing operation, and the initial pressure at the top of the tower is 1.2MPa. When the feed time reaches 60% of the reaction cycle , the pressure at the top of the tower drops to 0.2 MPa at a rate of 0.5MPa / h, and the reaction period is 40h; the coked oil gas generated by the reaction is sent to the pressure stabilizing tower, the light co...

Embodiment 2

[0064] Example 2 adopts the method provided by the present invention, and the operating conditions are basically the same as those in Example 1, except that the coke drum is operated at a constant pressure of 0.8 MPa. During the whole reaction cycle, the load of the fractionation tower is as follows Figure 5 .

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Abstract

The invention discloses a method and system for improving the stability of a needle coke production process, and the method comprises the following steps: feeding a coking reaction oil-gas product from a coking reaction system into a pressure stabilizing tower for treatment, and obtaining tower top light components and tower bottom oil after treatment; and dividing the obtained tower bottom oil into two streams after being subjected to buffer treatment, circulating the first stream of tower bottom oil to the pressure stabilizing tower after temperature adjustment, feeding the second stream of tower bottom oil into a coking fractionation system, and conducting separation to obtain light oil and heavy oil. According to the method, the operation stability of the needle coke production process can be improved, in the whole reaction period, the coking fractionation system is small in treatment capacity fluctuation and high in separation precision, the coke tower pressure is easy to control, and the operation stability of the whole system is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of needle coke preparation, in particular to a method and system for regulating the stability of the production process of needle coke. Background technique [0002] The production of needle coke usually adopts delayed coking process, but unlike conventional delayed coking, the formation of needle coke follows the theory of liquid phase carbonization, and the production process adopts variable temperature operation. [0003] CN103184057A discloses a method for producing needle coke by variable temperature operation, in which the inner temperature of the coke tower is controlled to maintain at 390°C to 510°C by controlling the outlet temperature of the coking heating furnace. In the first stage of the reaction, the internal temperature of the coke drum is 390°C to 460°C, and the system forms mesophase liquid crystals; in the second stage of the reaction, the internal temperature of the coke drum rises to 450°...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00C10G55/02C10G69/00
CPCC10G7/00C10G55/02C10G69/00C10G2300/1037C10G2300/10C10G2300/70C10G9/005C10G69/06C10G67/04C10G67/02C10B41/00C10B55/00C10G2300/4012
Inventor 陈天佐郭丹初人庆方向晨
Owner CHINA PETROLEUM & CHEM CORP
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