Wet viscous sludge pretreatment method suitable for heat treatment technology

Abstract

The invention relates to a wet viscous sludge pretreatment method suitable for a heat treatment technology, and aims to solve the problems of adhesion, wall hanging, poor air permeability, low reactivity and aggravated particulate matter emission in the heat treatment process of wet viscous sludge. The method is characterized by comprising the following five steps: analyzing and testing original sludge, screening out impurities in the original sludge, conditioning the sludge, extruding and granulating, and airing the granulated sludge. According to the invention, the plasticity, the overall binding force, the compressive strength, the air permeability and the reactivity of the sludge are remarkably enhanced by utilizing the characteristics of the added conditioner and the granulation and pressure application process, so that the heat treatment efficiency and effect of the wet viscous sludge are improved, the equipment operation cost is reduced, the particulate matter emission condition is improved, the environmental harmfulness of residual residues is weakened, and the clean and efficient treatment of the wet viscous sludge is realized.

Description

technical field [0001] The invention belongs to the technical field of resources and environment, and relates to the harmless treatment and resource utilization of wet sticky sludge, in particular to a wet sticky sludge pretreatment method suitable for heat treatment technology. Background technique [0002] In recent years, as my country's economy and society have shifted from a stage of high-speed growth to a stage of high-quality development, the environmental pollution problems of various sludges produced in production and life, such as municipal sludge, industrial sludge, river and lake bottom sludge, etc., have received unprecedented attention. Attention is paid to the increasingly stringent requirements of governments at all levels for the prevention and control of sludge pollution. Sludge has the characteristics of large output, wide sources, complex components, and various types, which brings considerable difficulties to its efficient and safe disposal. Heat treatme...

AI Technical Summary

Problems solved by technology

[0004] 1. Sludge is easy to cause adhesion and wall hanging on the wall surface, and further coking and sintering will occur, eventually causing blockage

[0005] 2. A large amount of salt in the bonded sludge will cause irreversible corrosion on the wall, causing damage to the refractory material, or even falling off

[0006] 3. During the heat treatment process, a large number of fine particles are easily produced, which are discharged from the reactor with the flue gas, which increases the load of the subsequent flue gas purification facilities and poses a threat to the atmospheric environment

[0007] 4. The wet viscous sludge has low porosity and small solid phase particles, and lacks evenly distributed inorganic framework substances. Therefore, the air permeability during the heat treatment process is poor, and the agglomeration is obvious, which seriously limits the flow and diffusion conditions of the reaction and generated gas, greatly Reduced heat treatment efficiency

Especially for smoldering treatment, it will directly lead to the unsustainable self-sustained combustion of sludge

[0008] The above problems will lead to the reduction of sludge heat treatment efficiency, treatment effect decline, operating cost increase, emission deterioration and other consequences. In severe cases, the furnace must be shut down for manual cleaning, which is time-consuming, financially and labor-intensive, and seriously affects the safe and efficient operation of treatment facilities.

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