Sludge synthetic fuel and method for preparing same

Abstract

The invention relates to a method for preparing sludge synthetic fuel. The method comprises the following steps of: 1) mixing 40 to 60 weight percent of sludge and biochemical treatment auxiliary materials in a biochemical treatment mixing device, performing biochemical treatment, and performing deodorization and sterilization on the sludge; 2) mixing the sludge and solidification auxiliary materials in a solidifying and mixing device, performing solidification, and simultaneously performing adsorption on sludge waste gas in the biochemical treatment mixing device and the solidifying and mixing device; 3) adding 1 to 10 weight percent of straws, 10 to 30 weight percent of coal dust and 10 to 35 weight percent of combustion improver into a fuel synthesizing and mixing device, mixing, and performing fuel synthesis; and 4) crushing the treated mixed sludge in a crushing device, performing wind power dehydration on the crushed mixing sludge by using a crushed-mixture conveying device, drying the mixture until the water content of the mixture is 20 percent, and feeding the mixture into a fuel molding machine for fuel molding. The method is high in sludge processing capacity, the calorific value of the synthesized fuel is over 5,000kcal / kg, the gas emission of the fuel after being burnt is lower than the national regulated emission standard, and the synthesized fuel is applicable to various combustion furnaces.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment systems, and in particular relates to a preparation method of sludge synthetic fuel. Background technique [0002] At present, the sludge treatment methods in my country mainly include sludge lime stabilization drying, sludge thermal drying, sludge incineration and coal-water slurry method and other sludge treatment methods. [0003] The sludge lime stable drying method is to use lime and other inorganic agents to condition the sludge, which can reduce the moisture content, improve the lateral shear force and sanitary conditions of the sludge, and facilitate the subsequent disposal of the sludge, and the sludge is alkalized and dried stably The technical principle is to use quicklime to stabilize the sludge. The quicklime reacts with water to generate calcium hydroxide. During this process, each kilogram of lime can combine 0.32kg of water and release 1141kJ of heat, raising the temperatu...

AI Technical Summary

Problems solved by technology

[0006] Storage, transportation, large project investment, high difficulty in sludge treatment, easy to cause secondary pollution

[0007] The coal-water slurry method is to make sludge coal-water slurry from the sludge of the sewage treatment plant, and then cleanly burn the sludge coal-water slurry in a circulating fluidized bed boiler to turn it into usable waste heat or electric energy; The process of muddy coal water slurry can first use coal powder and quicklime powder to absorb and filter urban sewage to form coal filter sludge, and then add coal powder to make sludge coal water slurry; it can also directly use sludge from sewage treatment plants to add coal to make sludge Coal-water slurry, due to the different original state of the coal used, can use granular coal and sludge ball mill to make a mixed coal slurry with a particle size of 50-150 μm, and then make sludge coal-water slurry; it can also directly use coal powder, sludge , sewage, dispersant, and stabilizer are added to the slurry tank to directly make sludge coal-water slurry. This method has relatively large project investment and single practicability. It can only be used as fuel for power plants, and the amount of coal water is large, while sludge The amount of utilization is small, and there are problems such as poor deodorization

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