Method for increasing yield of coal-pyrolysis-based tar in reaction atmosphere of methane-rich gas mixture in fluidized bed
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A tar yield, fluidized bed technology, applied in the energy field, can solve problems such as low product yield, and achieve the effects of simple operation, large processing capacity, and reduced hydropyrolysis cost
Inactive Publication Date: 2010-06-23
DALIAN UNIV OF TECH
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Liao Hongqiang et al. used a fixed-bed reactor to study the pyrolysis of pioneer lignite in coke oven gas atmosphere, and the results showed that the yield of tar pyrolyzed in coke oven gas and the yields of BTX and P
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Embodiment 1
[0030]The selected coal is Shenmu coal, and its industrial analysis and elemental analysis are shown in Table 1. 5g of coal was used in the test, without catalyst, the pyrolysis conditions were temperature 750°C, constant temperature time 30min, pressure 0.1MPa, reaction gas was 800ml / min methane-containing mixed gas, the gas composition was shown in Table 2, and the tar yield obtained was 20.5wt % daf, semi-coke yield was 67.1wt% daf.
Embodiment 2
[0032] Select catalyst to be Ni / MgO catalyst, and its preparation method is: impregnate 10% (weight percent) Ni(NO 3 ) 2 6H 2 O, dried at 110°C for 12 hours, calcined at 800°C for 4 hours, pressed into tablets, screened out 20-40 mesh particles, and H at 850°C 2 -N 2 The mixture was restored for 4 hours.
[0033] The selected coal is Shenmu coal, and its industrial analysis and elemental analysis are shown in Table 1. The test used 5g of coal, 1g of catalyst, the pyrolysis conditions were temperature 750°C, constant temperature time 30min, pressure 0.1MPa, reaction gas was 800ml / min methane-containing mixed gas, the gas composition was shown in Table 2, and the tar yield obtained was 23.8wt % daf, semi-coke yield was 67.3wt% daf.
Embodiment 3
[0035] Select catalyst to be Ni / MgO catalyst, and its preparation method is: impregnate 10% (weight percent) Ni(NO 3 ) 2 6H 2 O, dried at 110°C for 12 hours, calcined at 800°C for 4 hours, pressed into tablets, screened out 20-40 mesh particles, and H at 850°C 2 -N 2 The mixture was restored for 4 hours.
[0036] The selected coal is Shenmu coal, and its industrial analysis and elemental analysis are shown in Table 1. The test used 5g of coal, 1g of catalyst, the pyrolysis conditions were temperature 750°C, constant temperature time 30min, pressure 0.1MPa, reaction gas 400ml / min methane-containing mixture, the gas composition is shown in Table 2, and the tar yield obtained was 21.6wt % daf, semi-coke yield was 65.3wt% daf.
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Abstract
The invention belongs to the technical field of energy and provides a method for increasing the yield of coal-pyrolysis-based tar in the reaction atmosphere of a methane-rich gas mixture in a fluidized bed. The method is characterized by comprising the following steps: feeding the methane-rich gas mixture into the fluidized bed from the bottom of a pyrolysis reactor; conducting reaction firstly on a catalyst layer, so as to activate the gas mixture; adding the activated gas mixture as a fluidized gas to the fluidized coal in the fluidized bed, and subjecting the fluidized gas and the fluidized coal to pyrolysis and coking in a fluidized state; and subjecting the generated pyrolysis products to the treatment in a gas-solid separator, a condenser and an oil-water separator where carbocoal, coal gas and tar are respectively obtained. Accordingly, the activated gas mixture and the coal come into full contact through the coal pyrolysis in the fluidized bed, thereby help combining activated molecules with free radicals generated through the coal pyrolysis; the yield of pyrolysis-based tar is higher than that of the tar based on the pyrolysis conducted in the hydrogen atmosphere or inert atmosphere under the identical conditions; moreover, the catalysts are indirectly mixed with coal, thereby facilitating the cyclic regeneration and repeated use.
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 in a fluidized bed by using a mixed gas rich in methane as a reaction atmosphere. Background technique [0002] Coal is the main energy source in our country. The coal pyrolysis process is a method of extracting the hydrogen-rich components in the coal in the form of liquid and gas under relatively mild conditions before the coal is used by gasification, combustion or other methods, so as to improve the efficiency of coal utilization. However, the traditional coal pyrolysis process has the problems of low tar yield and high content of heavy components in tar. Studies have shown that the formation of tar during coal pyrolysis is related to thermal cracking of organic macromolecules in coal and the stabilization of cracking free radicals. Excessive cracking may form gas products, the combination of free radicals and small molec...
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