Method for preparing derived fuel from domestic sludge through high-temperature pyrolysis and gasification

Abstract

The invention discloses a method for preparing derivative fuel from domestic sludge through high-temperature pyrolysis and gasification. The method comprises the following steps of: preparing the derivative fuel, namely, adding domestic sludge, biomass fuel and an additive in proportion, stirring and mixing the materials to prepare the derivative fuel; and preparing biogas by pyrolyzing the derivative fuel, namely cracking the derivative fuel in a high-temperature pyrolysis gasification furnace, and performing oil removal, dust removal, cooling, desulfurization and dechlorination on mixed biogas obtained in the pyrolysis gasification furnace to obtain clean gas fuel and regenerated building material solid particles. According to the method of the invention, the domestic sludge and biomassfuel are prepared into the derivative fuel, then the derivative fuel is cracked into the mixed biological gas fuel and solid particles, the mixed biological gas fuel can be used for combined heat andpower generation and industrial and civil gas fuel, the solid particles can be used as building material preparation raw materials; and therefore, the purposes of resource regeneration and thorough garbage treatment are achieved. The ecological benefit, environmental benefit, social benefit and economic benefit of the method are excellent.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a high-temperature pyrolysis gasification method for producing derived fuel from domestic sludge. Background technique [0002] According to data from the China Environmental Statistical Yearbook, my country's industrial sewage discharge was basically maintained at around 20 billion tons per year from 2010 to 2017, and urban domestic sewage discharge increased from 35.4 billion tons to around 60 billion tons. In general, a sewage treatment plant can produce 5-8 tons of sludge with a moisture content of 80% for 10,000 tons of domestic sewage, and 10-30 tons of sludge for 10,000 tons of industrial sewage. According to calculations based on the unit output of 6.5 tons and 20 tons respectively, the sludge production in my country increased from 54.27 million tons to 74.36 million tons in 2010-2017, with an annual growth rate of 4.6%. [0003] The huge quantity of domestic sludge has ...

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Problems solved by technology

At present, the methods of domestic sludge treatment are landfill, composting, drying and incineration methods, but the above four treatment methods all have low treatment process level, easy to cause serious secondary environmental pollution, waste of a lot of resources, occupying an area Due to the problems of large area, high construction cost and high operating cost, it is impossible to realize the comprehensive utilization goal of "harmless, reduction, resource utilization, low carbonization and energy utilization" of waste disposal