Technique for preparing derived fuel from high-moisture domestic waste and municipal sludge

Abstract

The invention discloses an efficient technical process for preparing derived fuel from high-moisture domestic waste and municipal sludge. The technique comprises the following steps: by using domestic waste and municipal sludge as main components, progressively and gradually crushing the domestic waste without manual separation or previously dehydrating and drying the domestic waste and sludge, sequentially adding a certain proportion of additives, carrying out crushing, stirring and drying twice on the mixture by a fine crushing-stirring-molding integrated machine to sufficiently pulverize the domestic waste, and thoroughly mixing the sludge with the domestic waste and additives to carry out modification treatment; and carrying out extrusion molding on the sludge by a molding machine by using the viscosity of the sludge, and finally delivering to a low-temperature drier to carry out baking. The invention achieves the goals of energy saving and zero discharge in the production process.

Description

technical field [0001] The invention relates to a treatment method for domestic garbage and urban sludge, in particular to a process for preparing derived fuel from high-humidity domestic garbage and urban sludge. Background technique [0002] There have been a lot of researches at home and abroad on the process of making derived fuels from domestic garbage and sludge, but few have realized the industrialization of the process. The reason is mainly that the following recognized "high energy consumption" problems cannot be overcome. [0003] 1. Most of the existing techniques for preparing derived fuels from domestic waste and sludge use "dry molding". That is, the garbage and sludge must go through dehydration or special drying process before forming. Then this faces the following main problems: [0004] Problem 1: The amount of sewage generated after garbage dehydration is large, and the treatment cost is high. Many scientific research institutes and enterprises at home...

AI Technical Summary

Problems solved by technology

[0004] Problem 1: The amount of sewage generated after garbage dehydration is large, and the treatment cost is high

[0005] Problem 2: The energy consumption of the direct baking process of domestic waste is too high, which greatly increases the operating cost of the treatment process

[0006] Problem 3: Difficult to dewater sludge

The use of mechanical equipment to reduce its water content mainly has the following two methods: one is to increase the amount of flocculant input to increase the treatment cost, and the other is to prolong the production cycle and reduce the daily sewage treatment capacity

[0007] Problem 4: Difficult to dry sludge

[0008] 2. Some inventions use the process of bonding garbage into fuel and then baking, but it is difficult to realize industrialization

The energy consumption of this alone is so high that it is basically not feasible to dispose of household waste in large quantities

[0010] (2) The production process is too long and the process is complicated, so it is impossible to process the household garbage collected on the same day

[0011] In summary, the high cost of the production process and the inability to meet the environmental protection requirements of "zero emissions" are the main reasons restricting its industrialization

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