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Pulverized-coal and liquification residue co-pyrolysis dust removing system and method

A technology for coal liquefaction residue and liquefaction residue, which is applied to the mechanical treatment of coal loaded into the furnace, the purification of combustible gas, and the prevention/removal of fouling in the furnace. The waste of pulverized coal or semi-coke can improve the utilization rate of raw materials and reduce the energy consumption of pyrolysis.

Pending Publication Date: 2017-05-31
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particle size of coal powder, there is a high dust content in the separated oil and gas products, which will not only increase the subsequent utilization of oil and gas products, but also cause a large amount of waste of solid coal powder or semi-coke

Method used

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  • Pulverized-coal and liquification residue co-pyrolysis dust removing system and method
  • Pulverized-coal and liquification residue co-pyrolysis dust removing system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Using the system of the present invention, the pulverized coal with a particle size of less than 6mm and the liquefied residue at 290°C from the liquefied residue dust removal unit are sprayed into the fast pyrolysis furnace through the pulverized coal inlet 11 and the liquefied residue inlet 12 respectively, and the pulverized coal is sprayed into the fast pyrolysis furnace. The mass ratio of the reaction with the liquefied residue is 1:0.3, and the mixed material passes through the low-temperature dry distillation section and the high-temperature dry distillation section of the fast pyrolysis furnace sequentially under the action of gravity; wherein, the temperature of the low-temperature dry distillation section is 550-600°C, and the high-temperature dry distillation section The temperature of the section is 870-900°C; in the low-temperature dry distillation section, the liquefied residue is basically pyrolyzed completely, while the coal powder undergoes mild pyrolysis...

Embodiment 2

[0058] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. Spray pulverized coal with a particle size of less than 6mm and liquefied residue at 360°C from the liquefied residue dust removal unit into the fast pyrolysis furnace through the pulverized coal inlet 11 and the liquefied residue inlet 12, and react the pulverized coal with the liquefied residue The mass ratio of the mixture is 1:0.5, and the mixed materials rely on gravity to pass through the low-temperature dry distillation section and the high-temperature dry distillation section of the fast pyrolysis furnace in turn; among them, the temperature of the low-temperature dry distillation section is 650-700°C, and the temperature of the high-temperature dry distillation section is 900- 950℃; in the low-temperature dry distillation section, the liquefied residue is basically completely pyrolyzed, while the coal powder undergoes ...

Embodiment 3

[0061] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. Spray pulverized coal with a particle size of less than 6mm and liquefied residue at 240°C from the liquefied residue dust removal unit into the fast pyrolysis furnace through the pulverized coal inlet 11 and the liquefied residue inlet 12, and react the pulverized coal with the liquefied residue The mass ratio of the mixture is 1:0.4, and the mixed materials rely on gravity to pass through the low-temperature dry distillation section and the high-temperature dry distillation section of the fast pyrolysis furnace in turn; among them, the temperature of the low-temperature dry distillation section is 550-580°C, and the temperature of the high-temperature dry distillation section is 800- 850℃; in the low-temperature dry distillation section, the liquefied residue is basically completely pyrolyzed, while the coal powder undergoes ...

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Abstract

The invention discloses a pulverized-coal and liquification residue co-pyrolysis dust removing system and method. The pulverized-coal and liquification residue co-pyrolysis dust removing system comprises a co-pyrolysis unit, a liquification residue dust removing unit and an oil-gas separation unit; the co-pyrolysis unit comprises a pulverized-coal inlet, a liquification residue inlet, a raw gas outlet and a pyrolysis char outlet; a raw gas inlet, a dust removing gas outlet and a dust containing liquification residue outlet are formed in the liquification residue dust removing unit; the raw gas inlet is connected with the raw gas outlet; a dust removing gas inlet, a circulating cooling water inlet, a circulating cooling water outlet, a light oil outlet, a clean gas outlet and a heavy tar outlet are formed in the oil-gas separation unit. The pulverized-coal and liquification residue co-pyrolysis dust removing system and method, disclosed by the invention, have the advantages that the dust of the pyrolysis raw gas is removed by using high viscosity characteristic of the liquid liquification residue; when the dust content in the liquification residue reaches 50% or higher, the liquification residue is added to a pyrolyzing furnace together with the pulverized-coal at a high temperature to realize pyrolysis of the coal and the liquification residue between different temperature intervals, so that oil-gas products are generated; high value added utilization of the liquification residue is realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a system and method for dedusting by co-heating coal powder and liquefied residue. Background technique [0002] Among my country's proven coal reserves, low- and medium-rank coal accounts for more than 55% of the country's reserved resources. Low- and medium-rank coal contains relatively high levels of moisture and volatile matter, which is prone to spontaneous combustion and difficult to sort. Its comprehensive utilization is greatly restricted; at the same time, with the widespread use of modern comprehensive coal mining technology, the output of lump coal has declined, and the output of pulverized coal has increased (80%-90%), and there are problems such as dust and flammability. Therefore, the comprehensive utilization of medium and low rank pulverized coal is of great significance. [0003] At present, after the oil and gas in the middle and low-rank c...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B53/00C10B43/00C10B37/00C10K1/18
CPCC10B53/04C10B37/00C10B43/00C10B53/00C10K1/18
Inventor 刘维娜丁力张顺利任爱林吴道洪
Owner SHENWU TECH GRP CO LTD
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