Coal graded gradient utilization system and method
A kind of quality separation and coal technology, applied in the chemical industry, can solve the problems of large waste water and expensive hydrogen, and achieve the effects of reducing costs, increasing hydrogen content, and large material contact area
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Embodiment 1
[0053] Utilizing the system of the present invention, the pulverized middle and low rank coal powder and calcium carbide slag with particle size less than 6mm are sent to the heat-carrier-free regenerative descending bed by a belt conveyor. The mixed powder runs down from the top inlet of the descending bed relying on gravity, and pyrolyzes under the heating of the regenerative radiant tube during the downward process. The pyrolysis temperature is 700°C, so as to obtain raw gas and high-temperature mixed powder ; The raw coal gas is dedusted, purified and separated in the water spray tower to obtain clean gas, light tar and heavy tar; the clean gas is injected into the hydrogenation gasifier through the nozzle, and the coal injected into the pulverized coal nozzle Mix the powder thoroughly, and carry out hydrogasification reaction at 850°C to obtain methane-rich gas and light tar, which can be further utilized after purification and separation; heavy tar is sprayed into the gas...
Embodiment 2
[0055] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. The pulverized medium and low-rank coal powder and quicklime powder with a particle size of less than 6mm are sent to the non-heat carrier regenerative descending bed by a belt conveyor. The mixed powder runs down from the top inlet of the descending bed relying on gravity, and pyrolyzes under the heating of the regenerative radiant tube during the downward process. The pyrolysis temperature is 800°C, so as to obtain raw gas and high-temperature mixed powder ; The raw coal gas is dedusted, purified and separated in the water spray tower to obtain clean gas, light tar and heavy tar; the clean gas is injected into the hydrogenation gasifier through the nozzle, and the coal injected into the pulverized coal nozzle Mix the powder thoroughly, and carry out hydrogasification reaction at 800°C to obtain methane-rich gas and light tar...
Embodiment 3
[0057] This embodiment is the same as the system used in the above-mentioned embodiment 1, but the process conditions are different, as described below. The pulverized medium and low-rank coal powder and limestone with particle size less than 6mm are sent to the non-heat carrier regenerative descending bed by belt conveyor. The mixed powder runs down from the top inlet of the descending bed relying on gravity, and pyrolyzes under the heating of the regenerative radiant tube during the downward process. The pyrolysis temperature is 550°C, so as to obtain raw gas and high-temperature mixed powder ; The raw coal gas is dedusted, purified and separated in the water spray tower to obtain clean gas, light tar and heavy tar; the clean gas is injected into the hydrogenation gasifier through the nozzle, and the coal injected into the pulverized coal nozzle Mix the powder thoroughly, and carry out hydrogasification reaction at 1000°C to obtain methane-enriched gas and light tar, which a...
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Abstract
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