Combined system and method for processing oil gas generated by pyrolysis of low rank coal

A technology for pyrolysis of oil and gas and low-rank coal, which is applied in the petroleum industry, hydrotreating process, and hydrocarbon oil treatment, and can solve the problem that heavy components cannot be fully utilized, coal tar has a low degree of lightening, and tar and water High degree of emulsification, to avoid secondary condensation coke, save hydrogen production costs, and avoid phenolic sewage

Inactive Publication Date: 2016-09-14
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The conversion of coal in this process is coupled with the process of pyrolysis and gasification. This process generally uses pulverized coal as the raw material for pyrolysis. The traditional method of cooling and recovery of pyrolysis oil and gas requires oil-water separation, and the degree of emulsification of tar and water is high.
In addition, coal tar usually contains more coal powder and coal ash, and there are more heavy components. Extracting aromatics from full-fraction coal tar requires a large amount of raw material processing, high energy consumption, and low yield; Coal tar undergoes hydrofining treatment, the degree of lightening of coal tar is low, and heavy components cannot be fully utilized

Method used

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  • Combined system and method for processing oil gas generated by pyrolysis of low rank coal
  • Combined system and method for processing oil gas generated by pyrolysis of low rank coal
  • Combined system and method for processing oil gas generated by pyrolysis of low rank coal

Examples

Experimental program
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Effect test

Embodiment 1

[0097] The pyrolysis oil and gas are dedusted by the dust removal unit and then cooled to 420℃ in the pyrolysis oil and gas quench unit. After being stabilized by the stabilizer, they enter the atmospheric distillation tower at 400℃. The pyrolysis gas is separated at the top, and the naphtha fraction and diesel fraction are separated in the side line. , Heavy oil at the bottom of the atmospheric tower and primary cooled heavy oil are used as the feed of the suspended bed hydrocracking unit. The suspended bed hydrocracking reaction temperature is 420℃, the pressure is 12Mpa, the catalyst is molybdenum naphthenate, and the metal content is 80μg. / g, the vulcanizing agent is sublimated sulfur powder, the adding amount is 80μg / g, the cutting temperature of the light and heavy components in the vacuum distillation is 520℃, the residue oil gasification assistant is calcined dolomite, the adding amount is 0.3%, and the gasification agent is water Steam and oxygen, the ratio of oxygen t...

Embodiment 2

[0099] The pyrolysis oil and gas are dedusted by the dust removal unit and then cooled to 440℃ in the pyrolysis oil and gas quench unit. After being stabilized by the stabilizer, they enter the atmospheric distillation tower at 420℃. The pyrolysis gas is separated at the top, and the naphtha fraction and diesel fraction are separated in the side line. , The heavy oil at the bottom of the atmospheric tower and the first-cooled heavy oil are used as the feed of the suspended bed hydrocracking unit. The suspended bed hydrocracking reaction temperature is 450°C and the pressure is 18Mpa. Heterogeneous catalyst is added, and the mixture of laterite nickel and red mud is added. The amount is 0.5%, the homogeneous catalyst is a metal tungsten complex, measured by the metal element, the metal content is 50μg / g, the vulcanizing agent is sublimated sulfur powder, the addition amount is 100μg / g, and the cutting temperature of light and heavy components under reduced pressure is 550℃, resid...

Embodiment 3

[0101] The pyrolysis oil and gas are dedusted by the dust removal unit and then cooled to 460℃ in the pyrolysis oil and gas quench unit. After being stabilized by the stabilizer, they enter the atmospheric distillation tower at 450℃. The pyrolysis gas is separated at the top and the naphtha fraction and diesel fraction are separated in the side line. , The heavy oil at the bottom of the atmospheric column and the primary cooled heavy oil are used as the feed of the suspended bed hydrocracking unit. The suspended bed hydrocracking reaction temperature is 475℃, the pressure is 24Mpa, and the heterogeneous catalyst fixed bed hydrogenation waste agent is added, and the addition amount is 3% , The vulcanizing agent is sublimated sulfur powder, the cutting temperature of the light and heavy components in vacuum distillation is 565℃, the residue oil and gasification auxiliary is selected from calcined clay ore, the addition amount is 1.5%, the gasification agent is water vapor and oxyge...

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Abstract

The invention discloses a combined system and method for processing oil gas generated by pyrolysis of low rank coal. The system comprises a quench cooler, a normal pressure distillation column, a suspended bed hydrogenation reactor, a gas-liquid separator, a vacuum distillation tower, a residuum gasifying device, a gas separation and purification device, and a glycol synthesis system. The method comprises the following steps: quenching pyrolysis oil gas to generate cooled oil gas; subjecting cooled oil gas to normal pressure distillation to obtain heavy oil in the bottom of a distillation column and light fuel; cracking the heavy oil, separating gas and liquid to obtained cracked oil; subjecting cracked oil to vacuum distillation to obtain residual oil; gasifying the residual oil to obtain syngas; separating and purifying syngas to obtain hydrogen and carbon monoxide; and synthesizing carbon monoxide and hydrogen to obtain glycol. After vacuum deep extraction, the heavy residual oil is not returned to the suspended bed hydrogenation reactor, and thus the coking during the hydrogenation process in the suspended bed is avoided. The gas prepared from residual oil is used to produce glycol, the flexibility of heavy component processing is improved, and the economy of the technology is increased.

Description

Technical field [0001] The invention belongs to a combined system and method for processing oil and gas generated by pyrolysis of low-rank coal. More specifically, it relates to a system and method for producing light fuel oil and ethylene glycol by coupling the recovery and processing of tar and pyrolysis gas in the process of rapid coal pyrolysis. Background technique [0002] my country's proven coal reserves account for more than 55% of low-rank coals (such as long flame coal, lignite, etc.). Low-rank coals have low coalification degree, high volatile content, high water content, and low direct combustion or gasification efficiency. Faced with the utilization of low-rank coal, the prior art proposes a process technology for qualitative utilization. [0003] Separate utilization of coal is considered to be an effective way to clean and efficient use of low-rank coal, and is also the key development direction of coal chemical industry in my country during the 13th Five-Year Plan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/04C10B57/00C10B57/18C10G1/00C10G67/02C10K1/00
CPCC10B53/04C10B57/00C10B57/18C10G1/002C10G67/02C10G2400/06C10G2400/26C10K1/002
Inventor 朱元宝闫琛洋杜少春许梅梅吴道洪
Owner SHENWU TECH GRP CO LTD
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