Industrial producing process for coal series needle coke

A production process and technology of needle coke, which is applied in the field of industrialized production process of coal-based needle coke, to prevent coking of heating furnace tubes, reduce the amount of steam injection, and prevent the formation of secondary quinoline insolubles

Active Publication Date: 2007-04-11
山西宏特煤化工有限公司
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  • Abstract
  • Description
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  • Application Information

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  • Industrial producing process for coal series needle coke
  • Industrial producing process for coal series needle coke
  • Industrial producing process for coal series needle coke

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Experimental program
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Embodiment 1

[0114] The raw material used is soft asphalt, its softening point: 30-40°C, distillation test: the distillate volume before 300°C is less than 10vol%, density (100°C): 1.16-1.20g / cm 3 , Kangxi carbon: 27 ~ 35wt%, viscosity (140 ℃): 10 ~ 40cP.

[0115]Fig. 2 is a schematic flow chart of the raw material pretreatment process of the present invention. In the flash system, the soft asphalt from the soft asphalt tank 100 of the oil depot is pressurized by the flash raw material pump 19, the flow rate is controlled by a flow regulator, and then sent to the partial condenser 1A-1, 1A-2, where it is combined with the vacuum flash The flash oil vapor coming out of the top of the steam tower 3 is heated by heat exchange; then it enters the flash heating furnace 2, and the temperature of the soft asphalt entering the flash heating furnace is 210-240°C. Here, it first enters the upper convection section furnace tube for heating , and then enter the furnace tube in the radiant section. At...

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Abstract

The industrial producing process of coal series needle coke includes the following steps: stepped condensing the flash oil produced in vacuum flashing of coal tar pitch to obtain three, heavy, medium and light, fractions; polycondensating the medium fraction in an improved pitch circulating process to obtain condensed pitch; delay coking the condensed pitch and the heavy fraction and injecting N2 into the un-coked oil in the later coking stage to perform the final heating and coke drawing of the needle coke forming course; and final high temperature calcining to obtain coal series needle coke. Thus produced coal series needle coke has low thermal expansion coefficient and may be used in producing high power and super high power graphite electrode.

Description

technical field [0001] The invention relates to a production process of coal-based needle coke, in particular to an industrialized production process of coal-based needle coke. Background technique [0002] Needle coke is the main raw material for the production of high-power (HP) and ultra-high-power (UHP) graphite electrodes, which can be divided into petroleum-based needle coke and coal-based needle coke. Due to the good graphitization performance of needle coke, the HP and UHP graphite electrodes produced by it have excellent electrical and thermal conductivity, thermal shock resistance and oxidation resistance, which can meet the requirements of high current density in large-capacity electric arc furnaces and rapid cooling. In the rapid heating state, there are high mechanical strength and other smelting quality requirements, which are incomparable in terms of performance of graphite electrodes produced by ordinary coke. [0003] As petroleum processing tends to develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00C10B57/00
Inventor 吴连生戴惠筠刘光武李玉才辛文亮黄明光何云孙爱明苏久明陆东武
Owner 山西宏特煤化工有限公司
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