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System and method for pulverized coal pyrolysis coupling calcium carbide production

A technology of calcium carbide and coal powder, which is applied in the system field of coal powder pyrolysis coupled with calcium carbide production, can solve the problems of high dust content in oil and gas products, decline in lump coal output, waste of solid coal powder or semi-coke, etc., to reduce raw material costs and Production energy consumption, reducing energy consumption and raw material costs, and promoting the effect of catalytic cracking

Pending Publication Date: 2017-03-22
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with the widespread use of modern comprehensive coal mining technology, the output of lump coal has decreased and the output of pulverized coal has increased (80%-90%)
However, pulverized coal has a smaller particle size and is easily entrained under the action of pyrolysis gas, resulting in a higher dust content in the resulting oil and gas products, which will not only increase the difficulty of 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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Examples

Experimental program
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Effect test

Embodiment 1

[0061] Using the system of the present invention, the pulverized coal with a particle size of less than 6mm and the liquefied residue at 280°C from the liquefied residue dedusting unit are sprayed into the fast pyrolysis furnace respectively, and the mass ratio of the pulverized coal to the liquefied residue reacted is 1 :0.4, the mixed material relies on the effect of gravity to pass through the low-temperature dry distillation section and the high-temperature dry distillation section of the fast pyrolysis furnace successively; wherein, the temperature of the low-temperature dry distillation section is 550-600°C, and the temperature of the high-temperature dry distillation section is 870-900°C; In the dry distillation section, the liquefied residue is basically completely pyrolyzed, while the coal powder undergoes mild pyrolysis in this section, and the products are mainly pyrolysis gas and light tar; in the high-temperature dry distillation section, the coal powder pyrolyzes c...

Embodiment 2

[0064] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. Using the system of the present invention, the pulverized coal with a particle size of less than 6mm and the liquefied residue at 360°C from the liquefied residue dedusting unit are sprayed into the fast pyrolysis furnace respectively, and the mass ratio of the pulverized coal to the liquefied residue reacted is 1 :0.5, the mixed material relies on the effect of gravity to pass through the low-temperature dry distillation section and the high-temperature dry distillation section of the fast pyrolysis furnace successively; wherein, the temperature of the low-temperature dry distillation section is 580-620°C, and the temperature of the high-temperature dry distillation section is 850-880°C; In the dry distillation section, the liquefied residue is basically completely pyrolyzed, while the coal powder undergoes mild pyrolysis in t...

Embodiment 3

[0067] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. Using the system of the present invention, the pulverized coal with a particle size of less than 6mm and the liquefied residue at 320°C from the liquefied residue dedusting unit are sprayed into the fast pyrolysis furnace respectively, and the mass ratio of the pulverized coal to the liquefied residue reacted is 1 :0.3, the mixed material relies on the effect of gravity to pass through the low-temperature dry distillation section and the high-temperature dry distillation section of the fast pyrolysis furnace successively; wherein, the temperature of the low-temperature dry distillation section is 650-700°C, and the temperature of the high-temperature dry distillation section is 920-950°C; In the dry distillation section, the liquefied residue is basically completely pyrolyzed, while the coal powder undergoes mild pyrolysis in t...

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Abstract

The invention discloses a system and method for pulverized coal pyrolysis coupling calcium carbide production. The system comprises a co-pyrolysis unit, a liquefied residue dust removal unit and a calcium carbide production unit. The co-pyrolysis unit comprises a pulverized coal inlet, a liquefied residue inlet, a raw gas outlet and a pyrolysis semicoke outlet. The liquefied residue dust removal unit is provided with a raw gas inlet, a derusted gas outlet and a dust-containing liquefied residue outlet. The calcium carbide production unit is provided with a mixed semicoke inlet, a quick lime inlet, an oxygen-rich gas nozzle, a calcium carbide furnace gas outlet and a calcium carbide outlet. According to the system and method, the characteristics of liquefied residues are fully utilized, after pulverized coal is subjected to pyrolysis high-temperature gas dust removal, the liquefied residues and the pulverized coal are subjected to co-pyrolysis, and efficient utilization of the liquefied residues and recycling of carried dust are achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a system and method for coal powder pyrolysis coupled with calcium carbide production. Background technique [0002] Coal pyrolysis is the process of heating coal at a certain temperature and in an anaerobic environment, so as to decompose the volatile matter in the coal and produce pyrolysis solids, pyrolysis gas and tar. It is a key step to realize the classification and quality utilization of coal . Therefore, coupling pyrolysis technology with other technologies to achieve high-efficiency comprehensive utilization of pyrolysis products is considered to be the most effective way to efficiently utilize coal, and is the main direction of modern large-scale coal chemical industry. [0003] However, with the widespread use of modern comprehensive coal mining technology, the output of lump coal has decreased and the output of pulverized coal has increased (80...

Claims

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Application Information

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IPC IPC(8): C10B53/04C10B47/18C10K1/02C01B32/942
CPCC10B53/04C10B47/18C10K1/02
Inventor 刘维娜丁力董宾赵小楠吴道洪
Owner SHENWU TECH GRP CO LTD
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