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A method for producing coal-based needle coke

A production method and technology of needle coke, applied in coking ovens, coking carbonaceous materials, tar processing through selective solvent extraction, etc., can solve the problems that the quality of needle coke products has not yet reached the level of ultra-high power electrodes, and achieve improvement taste, improve product quality, and save energy

Active Publication Date: 2014-10-15
山西永东化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestically, Hongte Chemical has also expanded the needle coke method of solvent refining→delayed coking→calcination on the basis of the original process, which can be used as high-power electrode raw materials, but in terms of quality, the quality of needle coke products has not yet reached Japan's ultra-high power electrode level

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: the concrete steps of the present invention are:

[0018] (1) The coal tar is initially dehydrated to a water content of 2-3% after standing still, and then pumped into the convection section of the tubular heating furnace to be heated to 120-130°C by a first-stage pump, and then dehydrated in a first-stage evaporator until the water content is less than 0.5%; The coal tar at the bottom of the first-stage evaporator is pumped out by the second-stage pump and sent to the radiant section of the tubular heating furnace for heating at a heating temperature of 390--410°C; the coal tar used should meet the standard YB / T5075-2010;

[0019] (2) Coal tar is evaporated by the second-stage evaporator, and the light components at the top of the second-stage evaporator enter the coal tar fractionation column for rectification; the liquid phase at the bottom of the second-stage evaporator is coal tar pitch, and the softening point of the coal tar pitch is 30- At 40°C,...

Embodiment 2

[0029] Embodiment two: the concrete steps of the present invention are:

[0030] (1) The coal tar is initially dehydrated to a water content of 2-3% after standing still, and then pumped into the convection section of the tubular heating furnace to be heated to 120-130°C by a first-stage pump, and then dehydrated in a first-stage evaporator until the water content is less than 0.5%; The coal tar at the bottom of the first-stage evaporator is pumped out by the second-stage pump and sent to the radiant section of the tubular heating furnace for heating at a heating temperature of 390--410°C; the coal tar used should meet the standard YB / T5075-2010;

[0031] (2) Coal tar is evaporated by the second-stage evaporator, and the light components at the top of the second-stage evaporator enter the coal tar fractionation column for rectification; the liquid phase at the bottom of the second-stage evaporator is coal tar pitch, and the softening point of the coal tar pitch is 30- At 40°C,...

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Abstract

A production method of coal-based needle coke aims to save energy and improve product quality. The method provided by the invention comprises the steps of: first dehydrating coal tar to moisture content of 2-3%, heating to 120-130 DEG C, and then dehydrating to moisture content of less than 0.5%; then heating to 390-410 DEG C; sending coal tar pitch at bottom of the two-stage evaporator into a bulkhead type coal tar pitch extraction column; respectively heating an aliphatic extraction solvent and an aromatic extraction solvent to 110-250 DEG C, and mixing 0.5-1 part of an aliphatic solvent and 3-5 parts of an aromatic solvent to obtain an extractant; mixing the extractant and the coal pitch in a weight ratio of 1:0.5-1.3, and adding the mixture from the upper part of the bulkhead type coal tar pitch extraction column; discharging purified coal tar pitch from the middle part of the bulkhead type coal tar pitch extraction column; adding coking heavy oil into the coal tar pitch for modulation, sending the mixture into a middle part of a delayed coking distillate tower, distilling and pumping out from tower bottom, and heating the mixture at 520-580 DEG C and sending the mixture into the coking tower to obtain green coke; and calcining in a rotary furnace for 3-12 h, and escaping remaining volatile matters to prepare the coal-based needle coke.

Description

technical field [0001] The invention relates to a method for producing needle coke with coal tar pitch raw material. Background technique [0002] Needle coke is one of the effective ways to process coal tar to obtain high value-added products. The quality and cost of needle coke are closely related to raw materials. The purification of raw materials for needle coke mainly includes vacuum distillation, centrifugation, and upgrading. Although the process of vacuum distillation is simple, the yield of needle coke concentrate is low. The effect of centrifugal refining is general, the process is moderate, but the investment is large. The reforming method utilizes vacuum flash evaporation-polycondensation reforming in a polymerization kettle, and the equipment investment is large. At present, Nippon Steel and Mitsubishi Chemical Corporation's patented needle coke technology using solvent refining→delayed coking→calcination has been initially industrialized, but the scale has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10B55/00C10C1/18C10C3/08
Inventor 刘东玉刘冀生
Owner 山西永东化工股份有限公司