Preparation method of refuse derived fuel

Abstract

A preparation method of a refuse derived fuel comprises the following steps of: providing fiber sludge, adding a mixed material containing microbial flora, a bulking agent and a microbial fermentation promoter which are mixed according to a predetermined proportion, uniformly mixing, and carrying out fermentation on the uniformly-mixed materials and fiber sludge for a period of time so as to form the solid refuse fuel.

Description

technical field [0001] The invention relates to a method for preparing waste-derived fuel, in particular to a method for preparing waste-derived fuel by providing fibrous sludge as the main body. Background technique [0002] Cellulosic sludge, such as pulp sludge, is the sludge produced after sedimentation and dehydration of wastewater generated in the papermaking process. In the past, pulp sludge belonged to the R-type recycling waste project, and some clearing and transportation companies used pulp sludge as earthwork without treatment, and used it for random dumping or as construction fill, in order to charge high fees for clearing and transporting cost. However, since this kind of earth has no support for the foundation, it is easy to cause the danger of project collapse. In addition, when untreated pulp sludge is placed in bad storage places, it is easy to produce odor and waste water due to anaerobic fermentation, and it is easy to cause pollution to the environment...

AI Technical Summary

Problems solved by technology

[0006] (1) Putting directly into the boiler for combustion may easily cause the combustion furnace pipeline to burst or the life of the furnace body will be shortened, and the moisture content of the sludge is too high. The load is too high, or the pipeline is corroded and exploded due to the long-term high-temperature oxidation reaction, which will cost a huge amount of maintenance costs, and cause industrial and personal safety problems;

[0007] (2) It is necessary to add a large amount of fuel oil to assist combustion. Generally, pulp sludge contains about 70 to 90% of water according to the processing capacity of the dryer. Therefore, when it is put into the combustion furnace for combustion, if it is not supplemented with a large amount of fuel oil Auxiliary combustion will shut down the combustion furnace, and adding fuel oil is not only costly, but also not environmentally friendly; and

[0008] (3) During the combustion process, the temperature of the combustion furnace is likely to drop or the combustion is unstable, so that the steam pressure generated by the cogeneration equipment is insufficient, and the system cannot be effectively driven.

[0010] (1) High energy consumption, regardless of the use of electric heating, kiln baking, vacuum low-temperature drying, reduced pressure drying, microwave drying, or rolling and stirring drying, etc., to reduce the moisture content of sludge, a large amount of external energy is required , not energy-efficient or cost-effective;

[0011] (2) The drying system belongs to electromechanical integration equipment, and the cost of equipment construction and maintenance is high;

[0012] (3) High operating cost, in addition to the additional cost of the drying system, it also increases the use of vehicle power required for loading and unloading;

[0013] (4) The processing capacity is easily limited. Except for the belt kiln and belt microwave drying oven, they are all batch production equipment. Not only is the single processing volume limited, but also there are many operating procedures for loading and unloading; and

[0014] (5) When the batch processing volume is large, uneven drying may occur. If external energy is applied for drying treatment, it is easy to cause uneven drying on the outside and wet on the inside due to uneven mass transfer and heat transfer. Not only Affects drying results and is more likely to cause problems with fuel usage

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