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Method for increasing tar yield of coalite pyrolysis with methane as reaction gas

A technology for tar yield and reaction gas, which is applied in the petroleum industry, the preparation of liquid hydrocarbon mixtures, etc., can solve the problems of inability to recover semi-coke catalysts, inability to significantly improve tar yield, etc. The effect of recycling

Active Publication Date: 2005-09-07
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

Test result shows, what catalyzer mainly catalyzes is the gas phase reaction, promptly the macromolecular substance in the volatile matter is catalyzed into the gaseous substance of small molecule, can not obviously improve the productive rate of tar (Takarada, Fuel, 1992,71:1087), and , supporting the catalyst in situ, the catalyst in the semi-coke cannot be recovered

Method used

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  • Method for increasing tar yield of coalite pyrolysis with methane as reaction gas

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Experimental program
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Effect test

Embodiment 1

[0022] The selected catalyst is Ni / Al 2 o 3 Catalyst, its preparation method is: at 20-60 purpose Al 2 o 3 impregnated with 10% (weight percent) Ni(NO 3 ) 2 6H 2 O, dried at 100°C for 5 hours, calcined at 800°C for 8 hours, H at 700°C 2 Restore 10min;

[0023] The selected coal is Yanzhou coal, and its industrial analysis and elemental analysis are shown in Table 1. The test uses 5g of coal, 1g of catalyst, the pyrolysis conditions are temperature 700°C, constant temperature time 30min, pressure 2.0MPa, reaction gas 400ml / min CH 4 and 100ml / min air are mixed through the methane inlet C and the oxidant inlet D respectively, and then enter the reactor through the gas inlet A. The mixed gas passes through the catalyst layer 2 for activation reaction and enters the coal pyrolysis reaction layer 1 through the gas distribution plate 3 . The coal and reaction gases are co-pyrolyzed in a pressurized fixed-bed reactor. The liquid product generated by pyrolysis is taken out of ...

Embodiment 2

[0025] The selected catalyst is Ni / Al 2 o 3 Catalyst, its preparation method is: at 20-60 purpose Al 2 o 3 impregnated with 10% (weight percent) Ni(NO 3 ) 2 6H 2 O, dried at 100°C for 5 hours, calcined at 800°C for 8 hours, H at 700°C 2 Restore 10min;

[0026] The selected coal is Yanzhou coal, and its industrial analysis and elemental analysis are shown in Table 1. The test uses 5g of coal, 1g of catalyst, the pyrolysis conditions are temperature 700°C, constant temperature time 30min, pressure 2.0MPa, reaction gas 400ml / min CH 4 and 100ml / min oxygen are respectively mixed through methane inlet C and oxidant inlet D, and then enter the reactor through gas inlet A, and the mixed gas passes through the catalyst layer 2 for activation reaction and enters the coal pyrolysis reaction layer 1 through the gas distribution plate 3. The coal and reaction gases are co-pyrolyzed in a pressurized fixed-bed reactor. The liquid product generated by pyrolysis is taken out of the re...

Embodiment 3

[0028] The selected catalyst is Ni / Al 2 o 3 Catalyst, its preparation method is: at 20-60 purpose Al 2 o 3 impregnated with 10% (weight percent) Ni(NO 3 ) 2 6H 2 O, dried at 100°C for 5 hours, calcined at 800°C for 8 hours, H at 700°C 2 Restore 10min;

[0029] Pyrolysis: The pyrolysis reactor is shown in the attached figure. The reactor is divided into upper and lower layers. One end of the gas inlet is the catalyst layer 2, and the other end is the coal bed 1, separated by a gas distribution plate 3 in the middle.

[0030] The selected coal is Yanzhou coal, and its industrial analysis and elemental analysis are shown in Table 1. The test uses 5g of coal, 1g of catalyst, the pyrolysis conditions are temperature 600°C, constant temperature time 30min, pressure 2.0MPa, reaction gas 400ml / min CH 4 and 100ml / min oxygen are respectively mixed through methane inlet C and oxidant inlet D, and then enter the reactor through gas inlet A. The mixed gas passes through catalyst la...

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Abstract

The invention belongs to energy technology field and provides a method for increasing coking yield in coal pyrolytic and coking process. The method comprises employing methane as reacting gas and adding adequate oxidant, mixing them and introducing them to the pyrolytic reactor, which comprises two layers, the middle layer is separated by gas grid plate, activating the methane by catalyst, and introducing it to the coal layer, pyrolising and charring the coal. The invention is characterized in that it employs the methane instead of pure hydrogen gas as reacting gas, which can deduce the pyrolising cost; the coking yield is higher than that of employing hydrogen gas in the same condition; the char coal yield is equal to that of in the inert atmosphere but higher than that of employing hydrogen gas; the catalyst and coal do not mix directly, which is suitable for recovering.

Description

technical field [0001] The invention belongs to the field of energy technology, and in particular relates to a method for increasing the tar yield in coal pyrolysis and coking processes by using methane as reaction gas. Background technique [0002] The pyrolysis of coal is the basis of thermal conversion technologies such as coal combustion, gasification and liquefaction. In addition, the pyrolysis of coal under inert atmosphere and reducing atmosphere can obtain liquid fuel and chemical raw material with tar as the target product, and the obtained low-sulfur semi-coke is a clean solid fuel. Therefore, as a separate clean coal conversion technology, coal pyrolysis and hydropyrolysis have been paid more and more attention by researchers. The pyrolysis conversion rate of coal in an inert atmosphere is low, and the tar yield is low; the hydropyrolysis process aims to obtain the maximum tar product, and pure hydrogen is used as the reaction gas. The hydrogen production process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G1/00
Inventor 胡浩权刘全润
Owner DALIAN UNIV OF TECH
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