Method for increasing coal pyrolysis tar yield by return catalytic conversion of pyrolysis gas
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A technology for catalytic conversion and tar yield, applied in coke ovens, petroleum industry and other directions, can solve problems such as increased cost and low tar yield, and achieve the effects of improving yield and quality, simple production process and convenient operation
Inactive Publication Date: 2015-06-17
SHIHEZI UNIVERSITY
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However, the tar yield in the ordinary pyrolysis process is low, and the cost of hydropyrolysis increases sharply due to the high price of hydrogen; therefore, the development of new pyrolysis processes to replace coal hydropyrolysis has become a new direction for coal pyrolysis
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Embodiment 1
[0016] N 2 Atmosphere pyrolysis
[0017] The 30-60 mesh granular coal sample is in the pyrolysis temperature range of 500°C-650°C, N 2 Pyrolysis at a space velocity of 2400mL / g·h and a residence time of 30min. The tar yields at 500°C, 550°C, 600°C, and 650°C were 4.14%, 4.12%, 4.43%, and 4.55%, respectively. The corresponding yields of n-hexane solubles are 64.26%, 59.32%, 57.13%, 53.63%.
Embodiment 2
[0019] Pyrolysis under pyrolysis atmosphere
[0020] The 30-60 mesh granular coal sample is pyrolyzed at a pyrolysis temperature range of 500°C-650°C, a pyrolysis gas space velocity of 2400mL / g·h, and a residence time of 30min. The tar yields at 500°C, 550°C, 600°C, and 650°C were 4.61%, 5.17%, 5.03%, and 4.46%, respectively. The corresponding yields of n-hexane solubles are 73.96%, 65.35%, 58.45%, 66.44%.
Embodiment 3
[0022] Ni / Al 2 o 3 Catalytic activation of pyrolysis gas pyrolysis
[0023] The selected catalyst is Ni / Al 2 o 3 , and its preparation method is: at 20-40 mesh Al 2 o 3 impregnated with 10-20wt% Ni(NO 3 ) 2 , dried at 110°C for 12h, calcined at 800°C for 4h, and reduced at 600°C for 4h.
[0024] The 30-60 mesh granular coal sample is pyrolyzed at a pyrolysis temperature range of 500°C-650°C, a pyrolysis gas space velocity of 2400mL / g·h, and a residence time of 30min. The tar yields at 500°C, 550°C, 600°C, and 650°C were 3.45%, 5.02%, 4.90%, and 4.57%, respectively. The corresponding yields of n-hexane solubles are: 74.68%, 81.51%, 78.46%, 77.50%.
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Abstract
The invention provides a method for promoting bituminous coal pyrolysis and increasing a tar yield by catalytic conversion of pyrolysis gas generated by coal pyrolysis. In the invention, the pyrolysis gas generated by coal pyrolysis is used as reaction gas; in the coal pyrolysis process, the pyrolysis gas passes through a catalyst layer at first so as to carry out catalytic gasification reaction under the action of a catalyst, so that a gas flow containing methane is generated; and then, the gas flow enters a coal seam so as to carry out pyrolysis of a coal sample under the reaction gas. According to the invention, the catalyst is a nickel-containing catalyst; reforming reaction of CO, CO2 and CH4 can be carried out under the catalysis of nickel; an intermediate body generated in the reforming process can be used for stably pyrolyzing generated macromolecular radicals, so that the tar yield is increased; because the pyrolysis gas is used as the reaction gas, the cost due to addition of gases, such as hydrogen and methane, in the pyrolysis process can be reduced; simultaneously, the pyrolysis gas generated by coal pyrolysis is also recycled; the coal tar yield is also higher than the tar yield in N2 atmosphere under same conditions; and furthermore, due to layering in the pyrolysis process, the catalyst can be recycled.
Description
technical field [0001] The invention belongs to the technical field of energy, and relates to a method for increasing the yield of coal pyrolysis tar by using pyrolysis gas as a reaction gas and activating the pyrolysis gas through a catalyst. Background technique [0002] At present, while the total amount of world energy consumption continues to expand, it has the following two important characteristics: First, the growth rate of energy demand in developed countries has slowed down, and the energy consumption of developing countries represented by the Asia-Pacific region has risen rapidly. Second, the world's energy consumption structure is increasingly diversified. The production and consumption of oil and natural gas continue to rise. The problems of fossil energy depletion and energy and environmental pollution still plague mankind. Because coal has a reliable resource guarantee in replacing oil and natural gas resources, and already has a good technical foundation. ...
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