Treatment process of in-depth dehydration and resource utilization for sludge

Abstract

The invention provides a treatment process of in-depth dehydration and resource utilization for sludge. The process comprises the following steps that: afterheat steam with a temperature of 250 DEG C is extracted from a steam turbine of a pulverized coal boiler in a power plant and then delivered to a sludge in-depth dehydrator through a pipeline after the afterheat steam is adjusted to a temperature of 210 + / - 15 DEG C and a pressure of 0.4 + / - 0.1 MPa by a temperature-pressure reducer; wet municipal sludge with water content of 80 to 85% is delivered to a wet sludge storage tank, and in-depth dehydration is carried out so as to obtain sludge particles with water content of 40 + / - 4% and a particle size of 1 to 6 mm; the sludge particles obtained after in-depth dehydration is collected and stored in a dehydrated sludge storage bin; and the deeply dehydrated sludge particles in the dehydrated sludge storage bin is delivered to a coal conveying system of the boiler in the power plant by a dehydrated sludge belt conveying system through a gate valve at the bottom of the bin and mixed with fire coal, and an obtained mixture enters into the pulverized coal boiler in the power plant through a coal pulverizer and burnt at a temperature of 1200 DEG C so as to generate power. According to the invention, original pulverized coal boilers and coal conveying, burning and desulphurization facilities in the power plant are effectively utilized; equipment used in the whole process is simple; and the advantages of small investment, stable operation and no generation of secondary pollution are achieved.

Description

technical field [0001] The invention relates to a deep dehydration and resource utilization and disposal process of urban sludge, which belongs to the technical field of environmental protection and treatment, and in particular relates to a method of using the existing pulverized coal boiler, coal conveying system, steam waste heat system, and tail gas emission treatment system in a power plant to reduce waste water. Quantification, stabilization, harmless and resourceful disposal of municipal sludge. Background technique [0002] In the process of urbanization development, with the rapid improvement of my country's sewage treatment capacity, the output of sludge has also increased significantly. The composition of sludge is very complex. It is an aggregate composed of bacterial micelles formed by various microorganisms and the organic and inorganic substances adsorbed. In addition to containing a large amount of water, it also contains refractory organic substances, heavy m...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic municipal sludge is mainly treated by landfill, biocomposting, dry incineration, etc., but these methods have disadvantages: landfill sludge needs to occupy a large amount of land; biocomposting equipment requires a large investment and occupies an area of ; And the dry incineration of sludge, there are not only the method of adopting new incineration facilities, but also the method of using boiler steam and waste heat of flue gas to dry sludge, but there are generally problems of large project investment and high operating costs

Images