Enclosed multi-chamber fluidized bed drying method for sludge

A multi-chamber fluidized bed and sludge drying technology, applied in the direction of dehydration/drying/thickened sludge treatment, can solve the problems of low thermal efficiency and pollutant discharge, and achieve high thermal efficiency, small bed resistance and flexible operation Effect

Inactive Publication Date: 2008-05-28
SOUTHEAST UNIV
View PDF0 Cites 80 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: The present invention proposes a closed multi-chamber fluidized bed sludge drying method for the current problems of agglomeration, low thermal efficiency, and pollutant discharge in the sludge drying process. The method has the advantages of simple equipment structure and easy operation Convenience, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Enclosed multi-chamber fluidized bed drying method for sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] (1) The present invention aims at the problem that the sludge in the first and second chambers of the current multi-chamber fluidized bed drier is easy to agglomerate, and proposes the following solutions: 1. The temperature of each chamber of the fluidized bed drier in the present invention is 250 ° C to 300 ° C. ℃ to control the sludge cohesive strength. Simultaneously control the residence time of the sludge in the bed to minimize the separation of volatile components in the sludge; 2. in the present invention, a part of the dried sludge is re-mixed to the first chamber of the fluidized bed to make the mixed sludge The moisture content of the mud is about 50%, so that it directly crosses the "adhesive phase" to reduce the adhesion of the sludge in the dryer; ③ the first and second chambers of the fluidized bed dryer in the present invention are fluidized with inert particles The main difference between it and the traditional fluidized bed dryer is that it is filled w...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A closed multi-room fluidized bed sludge drying method is provided, which is a sludge drying method having the advantages of simple equipment structure, convenient operation, strong sludge adaptability, high thermal efficiency, safety, continuity, stability, etc. After the mechanically dewatered sludge is mixed with the back-mixed sludge, the mixture is dried room by room in an inert particles multi-room fluidized bed dryer (3). The first room and the second room of the inert particles multi-room fluidized bed dryer (3) adopt inert particles (f) as heat storage medium. Gas from a cyclone separator (5) goes through a spray tower (7) and returns into an air heating unit (4) through a circulating fan (10). Part of dried sludge (e) at the lower part of the cyclone separator (5) enters the inert particles multi-room fluidized bed dryer (3) through the back-mixing in a mixer (2). Waste liquid from the bottom of the spray tower (7) enters a waste liquid circulating pool (8), with part of waste liquid circulating into the spray tower (7) and part into a sewage treatment system.

Description

technical field [0001] The invention relates to a method for drying wet sludge, in particular to a closed multi-chamber fluidized bed sludge drying method. Background technique [0002] Sludge is a high-moisture porous medium material with high water content and large volume. The moisture content of untreated sludge is as high as 95%. Landfilling, composting and fuel utilization of sludge all require the moisture content of sludge to be reduced to below 65%. At present, the mechanical dehydration method can only reduce the moisture content to 70% to 80%. To remove the capillary water and adsorbed water of the sludge, the thermal drying method must be used. [0003] Since the invention of fluidization technology in 1921, its characteristics of large heat capacity coefficient, high thermal efficiency, good sealing performance and adjustable residence time have provided the most favorable conditions for the high degree of drying of materials, so it has become the best drying p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12
Inventor 黄亚继金保升仲兆平钟文琪肖睿肖刚段锋
Owner SOUTHEAST UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap