Discussion on Co-Disposal of"Three Muds"in Coal-to-Hydrogen Gasification
A refinery intends to send the scum/sludge and activated sludge from the sewage treatment plant to the coal-to-hydrogen gasification to achieve the resource utilization of"three muds".The designed annual processing capacity is 42,000 tons/year for floating sludge/oil sludge and 21,000 tons/year for activated sludge.Based on blending ratio experiments,the blending ratio of floating sludge/oil sludge and activated sludge should not exceed 12%when mixed with water-coal slurry.According to calculations,after project implementation,there are no significant changes in the feed and discharge of the unit before and after modification.The sulfur content increases by approximately 24 tons/year after modification.The amount of waste slag generated from co-burning floating sludge/oil sludge and activated sludge increases by about 2,000 tons/year compared to before modification.The annual energy savings are equivalent to 882.18 tons of standard coal,and carbon emissions can be reduced by 399.41 tons per year,demonstrating significant environmental benefits.
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