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A process for producing needle coke

A process method, needle coke technology, applied in the petroleum industry, only multi-stage series-connected refining and cracking process treatment, treatment of hydrocarbon oil, etc.

Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if it is in the high viscosity environment in the later stage of coking, it cannot be guaranteed that the material ejected from the distributor has enough power to evenly distribute in the cross section of the system

Method used

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  • A process for producing needle coke
  • A process for producing needle coke
  • A process for producing needle coke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Using the refined catalytic oil slurry of a refinery as raw material, the specific properties of the refined oil slurry are shown in Table 1. The raw material oil is passed through a vacuum distillation device to obtain light and heavy distillate oils. Among them, the temperature of 90% of light distillate oil is controlled at 450 ℃, after the light distillate oil is heated by the coking heating furnace, it enters the coke tower from two symmetrically designed inlets at the bottom of the coke tower for coke filling. The bottom cycle oil circulation ratio is controlled at 0.5, and the coke charging duration is 14 hours; after the coke charging process of the coke tower with light distillate oil is completed, the heating furnace feed is switched to heavy distillate oil in the heavy distillate oil collection tank to continue charging the coke tower Coke, the pressure at the top of the coke tower is controlled at 0.5MPa, the outlet temperature of the heating furnace is contr...

Embodiment 2

[0051] Using the same device and raw materials as in Example 1, the raw oil is passed through a vacuum distillation device to obtain light and heavy distillate oils, wherein the temperature of 90% of the light distillate oil is controlled at 440 ° C, and the light distillate oil is heated by a coking furnace. Two symmetrically designed inlets at the bottom of the coke tower enter the coke tower for coke filling. At this time, the pressure at the top of the coking tower is 2.0MPa, the temperature at the outlet of the heating furnace is controlled at 450°C, and the circulation ratio of the circulating oil at the bottom of the coking fractionation tower is controlled at 0.1 , the coke charging duration of this stage is 18h; after the coke charging process of the coke tower with light distillate oil is completed, the heating furnace feed is switched to the heavy distillate oil in the heavy distillate oil collection tank to continue charging the coke tower. At this time, the coke Th...

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Abstract

The invention discloses a process for producing needle coke, which includes the following contents: (1) light and heavy distillate oils are obtained from raw oil through a vacuum distillation device, and the light distillate oil is heated in a coking heating furnace and then enters a coke tower for coke filling; (2) After the coke charging process of the coke tower with light distillate oil in step (1), the heating furnace feed is switched to the heavy distillate oil in the heavy distillate oil collection tank described in step (1) to continue to charge the coke Coke tower filling; (3) After the coke charging process of the coke tower with the heavy distillate oil in step (2), the heating furnace feed is switched to the light distillate oil in the light distillate oil collection tank described in step (1) to continue Charging the coke tower, wherein the coke tower is provided with at least two feed ports. The needle coke produced by the method has the advantages of stable streamlined texture, low thermal expansion coefficient and the like, and is suitable for producing various graphite electrodes.

Description

technical field [0001] The invention relates to a process method for producing needle coke, in particular to a process method for producing needle coke using petroleum-based or coal-based raw materials for continuous production and stable performance. Background technique [0002] Needle coke is mainly used to produce high-power and ultra-high-power graphite electrodes. Each ton of high-power graphite electrode requires 0.15 t to 0.30 t of needle coke (on average 0.20 t); each ton of ultra-high-power graphite electrode requires about 1.05 t of needle coke. The output of needle coke is determined by the output of high-power and ultra-high-power graphite electrodes, so the output of electric furnace steelmaking determines the demand for needle coke. With the development of the steel age, the output of steel scrap has gradually increased, which has promoted the development of electric furnace steel, and will inevitably increase the amount of graphite electrodes, especially hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/04
CPCC10G55/04C10G2300/4006C10G2300/4012
Inventor 曹东学方向晨初人庆郭丹宋永一刘继华勾连忠武云
Owner CHINA PETROLEUM & CHEM CORP