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A system and method for utilizing low rank coal

A technology of low-rank coal and coal tar, which is applied in the system field of utilizing low-rank coal, and can solve problems such as high viscosity, difficult processing of raw material screening and crushing, and ineffective use of heat from pyrolysis oil and gas, etc.

Active Publication Date: 2018-03-23
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the viscosity of low-temperature coal tar or its distillation residue is relatively high, and the way of uniform mixing with the raw coal will make the coal powder into lumps or mud, which will bring difficulties to the screening and crushing of raw materials.
In addition, the pyrolysis of oil and gas is water-cooled, which will generate a large amount of sewage, and the heat of pyrolysis of oil and gas is not effectively utilized

Method used

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  • A system and method for utilizing low rank coal
  • A system and method for utilizing low rank coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] This embodiment proposes a system for processing coal tar, including a pyrolysis unit, a desulfurization and decarbonization unit, a sulfur recovery unit, a catalyst preparation unit and a pyrolysis oil and gas treatment unit:

[0081] The particle size of low-order pulverized coal (≤3mm) is pyrolyzed in the down-going bed, and the lower formation temperature is controlled at 700°C. The pyrolysis oil-gas mixture is discharged from the exhaust port at the upper end of the down-going bed. Coal production is discharged from the lower part of the fast pyrolysis furnace as a product;

[0082] The pyrolysis oil gas discharged from the upper end of the fast pyrolysis furnace enters the cooling tower after being filtered. The pyrolysis oil gas enters the tower from the lower end of the cooling tower, and the cooling water enters the tower from the upper end to contact the pyrolysis oil gas in reverse to cool down. The temperature at the bottom of the tower is controlled at 80°C...

Embodiment 2

[0093] The present embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as follows:

[0094] The particle size of low-order pulverized coal (≤3mm) is pyrolyzed in the down-going bed, and the lower formation temperature is controlled at 500°C. The pyrolysis oil-gas mixture is discharged from the exhaust port at the upper end of the down-going bed. Coal production is discharged from the lower part of the fast pyrolysis furnace as a product;

[0095] The pyrolysis oil gas discharged from the upper end of the fast pyrolysis furnace enters the cooling tower after being filtered. The pyrolysis oil gas enters the tower from the lower end of the cooling tower, and the cooling water enters the tower from the upper end to contact the pyrolysis oil gas in reverse to cool down. The temperature at the bottom of the tower is controlled at 70°C, the uncooled gas exits the cooling tower from the top of the tower, and the cool...

Embodiment 3

[0106] The present embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as follows:

[0107] The particle size of low-order pulverized coal (≤3mm) is pyrolyzed in the down-going bed, and the lower formation temperature is controlled at 900°C. The pyrolysis oil-gas mixture is discharged from the exhaust port at the upper end of the down-going bed. Coal production is discharged from the lower part of the fast pyrolysis furnace as a product;

[0108] The pyrolysis oil gas discharged from the upper end of the fast pyrolysis furnace enters the cooling tower after being filtered. The pyrolysis oil gas enters the tower from the lower end of the cooling tower, and the cooling water enters the tower from the upper end to contact the pyrolysis oil gas in reverse to cool down. The temperature at the bottom of the tower is controlled at 90°C, the uncooled gas exits the cooling tower from the top of the tower, and the cool...

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Abstract

The invention discloses a system and a method utilizing low-tank coal. The system comprises a pyrolysis unit, a desulfuration and decarburization unit, a sulfur recovering unit, a catalyst preparing unit and a pyrolysis oil gas processing unit, wherein the pyrolysis unit is used for pyrolyzing low-tank coal dust, filtering and cooling pyrolyzed oil gas and separating an oil-water mixture; the desulfuration and decarburization unit is used for performing desulfuration and decarburization processing on gas to obtain a product gas; the sulfur recovering unit is used for recovering hydrogen sulfide in acid gas after desulfuration and decarburization, and hydrogen sulfide is further converted into elemental sulfur; for the catalyst preparing unit, a desulfuration adsorbent is used for adsorbing the acid gas, and the adsorbent after saturation by adsorption is used as the catalyst for the pyrolysis oil gas processing unit; and the pyrolysis oil gas processing unit is used for reaction of hydrogen, the catalyst and coal tar. The system and the method can sufficiently utilize acid gas produced during coal pyrolysis and tar hydrogenation, and can complete the preparation of a coal tar suspended bed hydrogenation pretreatment catalyst while processing the acid gas with the adsorbent.

Description

technical field [0001] The invention belongs to the technical field of coal treatment, in particular to a system and method for utilizing low-rank coal. Background technique [0002] The quality-based utilization of coal is considered to be an effective way of clean and efficient utilization of coal, and it is also the key development direction of coal chemical industry in my country's "13th Five-Year Plan". The separation and utilization of coal is to separate the different components in coal through pyrolysis, including gas, tar and semi-coke. Gasoline and diesel can be produced from coal tar through hydrogenation, and semi-coke can be converted into a low-volatile, low-sulfur clean fuel through pyrolysis, which can replace scattered coal to reduce air pollution. [0003] The coal pyrolysis technology is the "leader" of coal quality separation and utilization. To extract tar and gas with large-scale production, coal quality separation and utilization need to be large-scal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00C10B53/04C01B17/04B01D53/78B01D53/48B01D53/62B01D53/96
CPCB01D53/02B01D53/48B01D53/62B01D53/78B01D53/96B01D2253/1124C01B17/04C10B53/04C10G1/002
Inventor 闫琛洋朱元宝许梅梅杜少春史雪君薛逊吴道洪
Owner SHENWU TECH GRP CO LTD