Solid fuel for sludge anhydration

Abstract

The invention discloses a dried sludge solid fuel, which relates to a formula of a solid fuel prepared by drying sludge. The dried sludge solid fuel is prepared by mixing and press forming or powdering the sludge and an additive, wherein according to the weight of the sludge, the additive comprises the following components by weight percentage: 5 to 10 percent of wooden meal, 0 to 20 percent of coal powder, 5 to 15 percent of screen residues of aged refuse, and 1 to 5 percent of dewatering agent; the sludge is dewatered sludge with an initial moisture content of 80 percent and a dry base heatvalue of 7,000 to 18,000 kJ / kg from a sewage plant; the dewatering agent comprises calcium oxide, magnesium oxide, magnesium chloride and aluminum chloride in a mass portion ratio of 1:5.5-10:1:2.5-3; and the screen residues of aged refuse are screen residues mainly comprising plastic, fibers and paper which are landfilled for 8 to 10 years, initially ground and passed through a screen with an aperture of 60 millimeters. By changing the conventional method for preparing a fuel by using sludge as an additive, the method can fully realize the stabilization and recycling of the sludge and fulfill the aim of treatment of wastes with processes of wastes against one another. The product of the method completely meets the requirement on stable burning for power generation and has better economicand social benefits.

Description

Technical field [0001] A sludge drying solid fuel relates to a formula of solid fuel made by sludge drying. It belongs to the technical field of solid waste recycling. Background technique [0002] With the improvement of sewage treatment facilities, how to quickly realize the resource and harmlessness of sludge has become the development direction of sludge treatment and disposal. At present, sludge treatment and disposal methods mainly include sludge solidification landfill, sludge composting and sludge incineration. Among them, sludge incineration, as one of the most rapid sludge recycling and harmless treatment methods, has received increasing attention. [0003] Sludge is the remaining microbial residue in the sewage treatment process. The sludge contains a large amount of organic matter and a certain amount of fiber lignin. It has a certain calorific value and can be disposed of by incineration. However, due to the high water content of the sludge, As a result, its low calo...

AI Technical Summary

Problems solved by technology

Although the fuel rods produced by this method have a high calorific value, binders need to be added in the production process, energy consumption is required in the drying process, and the addition of combustion aid components is relatively large, resulting in high costs.