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Delayed coking process for preparing coal-based needle coke

A delayed coking and needle coke technology, applied in the multi-tower delayed coking process field, can solve the problems of solvent coking, uncontrollable reaction process of coal-based needle coke raw materials, difficult long-term stable operation of the process flow, etc., so as to avoid coking blockage. Effect

Active Publication Date: 2019-02-22
山西中科化美科技有限责任公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the large difference in the molecular structure and composition of coal tar pitch and petroleum-based raw materials, the proportion of petroleum-based raw materials added is relatively small, and the mesophase formation and coking reaction conditions of the two raw materials are different, so the delayed coking process conditions need Adjust according to different raw materials, it is difficult to run stably for a long period of time
[0005] The above-mentioned existing technologies have problems such as the inability to control the reaction process of coal-based needle coke raw materials in the delayed coking process, coking of solvents in heating furnace tubes, feed pipes, etc., and difficulty in long-term stable operation of the process flow.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as Figure 1-2 As shown, a delayed coking process for preparing coal-based needle coke, the specific steps are as follows:

[0026] 1. The refined raw material of medium-temperature coal tar pitch pretreated by solvent. The content of quinoline insoluble matter in the refined raw material is 0.08%. The refined raw material is heated to 395°C by low-temperature heating furnace 1 and sent to thermal polymerization tower 2. In a nitrogen atmosphere, Under the conditions of reaction temperature of 390°C and reaction pressure of 0.1MPa, stir for 3h;

[0027] 2. When the mesophase content of the material reaches 35%, send the mesophase-containing material obtained in the thermal polymerization kettle to the high-temperature heating furnace 3 together with diesel oil;

[0028] 3. Raise the temperature of the mixed material in the high-temperature heating furnace 3 to 486°C, and send the mixed material to the coke tower;

[0029] 4. Control the temperature in the coke drum to 482...

Embodiment 2

[0033] A delayed coking process for preparing coal-based needle coke, the specific steps are as follows:

[0034] 1. High-temperature coal tar refined raw material after solvent pretreatment, the content of quinoline insoluble matter in the refined raw material is 0.03%. The refined raw material is heated to 386°C by low-temperature heating furnace 1 and then sent to thermal polymerization tower 2. In a nitrogen atmosphere, Under the conditions of reaction temperature of 380°C and reaction pressure of 0.2MPa, stir for 1.5h;

[0035] 2. When the mesophase content of the material reaches 32%, the mixture of the mesophase-containing material, tetralin and diesel obtained in the thermal polymerization kettle is sent to the high-temperature heating furnace 3;

[0036] 3. Raise the temperature of the mixed material in the high-temperature heating furnace 3 to 486°C, and send the mixed material to the coke tower;

[0037] 4. Control the temperature in the coke drum to 498°C, the coke generat...

Embodiment 3

[0041] A delayed coking process for preparing coal-based needle coke, the specific steps are as follows:

[0042] 1. The refined raw material of modified asphalt after solvent pretreatment. The content of quinoline insoluble matter in the refined raw material is 0.05%. The refined raw material is heated to 373°C by low-temperature heating furnace 1 and sent to thermal polymerization tower 2. In a nitrogen atmosphere, Under the conditions of reaction temperature of 370℃ and reaction pressure of 0.8MPa, stir for 1h;

[0043] 2. When the mesophase content of the material reaches 30%, send the mesophase-containing material obtained in the thermal polymerization kettle and liquid paraffin into the high-temperature heating furnace 3;

[0044] 3. Raise the temperature of the mixed material in the high-temperature heating furnace 3 to 510°C, and send the mixed material to the coke tower;

[0045] 4. Control the temperature in the coke drum to 460℃, the coke generation time to 33h, and the cok...

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Abstract

The invention belongs to the technical field of needle coke preparation, and relates to a delayed coking process for preparing coal-based needle coke, in particular to a multi-tower delayed coking process with a heat polycondensation tower and a coking tower. The technical scheme includes that the coking process includes the steps: pretreating coal tar, coal pitch, modified pitch and the like to obtain finished raw materials; heating the finished raw materials, and enabling the heated raw material to enter a heat polymerization tower; polymerizing the raw materials to generate an intermediatephase in the inertness or reduction atmosphere; rapidly heating materials containing the intermediate phase and inert oil when the content of the intermediate phase of the materials reaches 30-60%; conveying the heated mixture into the coking tower to generate coke, and calcining the coke to obtain the needle coke. High-temperature oil and gas of the coking tower is divided into fuel gas and coking oil by a fractionating tower, the coking tower serves as a product output system, the process can accurately control coking reaction degree of coal-based needle coke raw materials, coking and jamming of a device pipeline are avoided, and long-period stable operation of coal-based needle coke production is achieved.

Description

Technical field [0001] The invention belongs to the technical field of needle coke preparation, and relates to a delayed coking process for preparing coal-based needle coke, in particular to a multi-tower delayed coking process having a thermal condensation tower and a coking tower at the same time. Background technique [0002] Needle coke is a high-quality carbon material with the advantages of low ash, low thermal expansion, high conductivity, high anisotropy, etc. It is widely used in many fields such as high-power / ultra-high-power graphite electrodes, lithium battery anode materials, and special graphite materials. . According to different raw materials, it is divided into coal-based needle coke and oil-based needle coke. The raw materials of coal-based needle coke are represented by coal tar pitch. Compared with oil-based needle coke materials such as residual oil and catalytic oil slurry, it is characterized by high polycyclic aromatic hydrocarbon content, low alkane cont...

Claims

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Application Information

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IPC IPC(8): C10G55/04C10B55/00C10B57/00
CPCC10B55/00C10B57/005C10G55/04C10G2300/10
Inventor 王磊赵亮富郭少青冯硕
Owner 山西中科化美科技有限责任公司
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