CN201729747U

CN201729747U - Sludge granulation dryer

Info

Publication number: CN201729747U
Application number: CN2010202913647U
Authority: CN
Inventors: 沈来宏; 张海峰; 肖军
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2010-08-11
Filing date: 2010-08-11
Publication date: 2011-02-02
Anticipated expiration: 2020-08-11

Abstract

The utility model relates to a sludge granulation dryer, which belongs to a device capable of safely and effectively processing wet sludge of a sewage plant to bring convenience to the subsequent resource development and utilization. The sludge granulation dryer consists of a spiral extrusion particle forming machine, a spouted fluidized bed and a dewatered sludge particle material cabin, wherein the spiral extrusion particle forming machine consists of a transmission shaft, a spiral feeder, a sludge extrusion forming pore plate and a rotary cutter blade. The utility model has the method with the following steps that a middle separation plate separates the spouted fluidized bed into two regions: a spouted bed and a fluidized bed which maintain the communicated state at top and bottom, wet sludge particles from the spiral extrusion particle forming machine downwards enter the spouted bed from the bed layer surface of the spouted bed, sludge forming particles after primary drying flow into the bottom part of the fluidized bed from an opening part at the lower part of the spouted bed, the other part of hot gas media enter the fluidized bed from a gas inlet of fluidized wind for carrying out deep drying on sludge particles, and dried sludge particles upwards move to the bed layer surface of the fluidized bed from the bottom part of the fluidized bed, and finally overflow from the fluidized bed to enter the dewatered sludge particle cabin.

Description

A kind of mud granulizing drying installation

Technical field

A kind of device of the utility model for wet mud is handled, especially a kind of mud granulizing drying installation.

Background technology

Along with the raising of urbanization process quickening and living standards of the people, the city domestic sewage amount sharply increases.The auxiliary product of mud after as sewage work's sewage disposal is because of being rich in objectionable impuritiess such as organic detritus, bacterium thalline and heavy metal, very big to environmental influence.Sludge treatment has become the significant problem of the puzzlement sewage work and the whole society, how to handle municipal sludge safely and effectively, has become the focus of current research.

The primary sludge water ratio of sewage work is up to 95%, the mechanical dehydration method can only reduce to 80% with its water ratio at present, subsequent disposal is disposed very difficult, and in methods of disposal such as sludge incineration, compost, landfill, all requires the water ratio of mud is reduced to below 65%; On the other hand, the solid composition is to exist in the wet mud with molecule in the mud, and that the mud after the mummification presents is Powdered, waves in atmosphere contaminate environment easily.Therefore, the mud granulizing drying becomes economy, efficiently handles the gordian technique of mud.

In the fluidized bed dryer of routine, easily bonding is agglomerating in fluidized-bed for the wet mud behind the mechanical dehydration, causes the fluidized bed dryer can't works better, and along with the rising of mud temperature, wet mud bonding agglomeration is even more serious; On the other hand, conventional fluidized bed dryer is unfavorable for the mud granulizing drying because particle layers structure coalescence inhomogeneous, bubble causes an interior channel, undesired fluidisation phenomenon such as turbulent.

Summary of the invention

Technical problem: the purpose of this utility model provides a kind of mud granulizing exsiccant device, adopts this device to handle the wet mud of Sewage Plant safely and effectively, is convenient to the follow-up resource utilization development and use of mud.

Technical scheme: mud granulizing drying installation of the present utility model comprises screw extrusion granule-forming machine, spouted fluidized bed and dewatered sludge particle feed bin; Wherein, the screw extrusion granule-forming machine comprises transmission shaft, screw feeder, mud extrusion molding orifice plate and rotating blade, mud extrusion molding orifice plate is fixed in the housing of screw feeder downstream, and transmission shaft passes mud extrusion molding orifice plate and rotating blade links; The outlet of screw extrusion granule-forming machine connects spouted fluidized bed, spouted fluidized bed is drawn spouted bed and two zones of fluidized-bed that are divided into maintenance connection up and down with central dividing plate, the bottom of spouted bed is spouted wind inlet mouth, the bottom of fluidized-bed is the fluidized wind inlet mouth, the middle part of fluidized-bed is an overflow port, and overflow port and dewatered sludge particle feed bin link; The top of this spouted fluidized bed is for containing the humid gas venting port.The perforate of described mud extrusion molding orifice plate is circular, oval, square or Polygons, or difform combination.

The granulating and drying method of mud granulizing drying installation of the present utility model is: the mud that will wet is delivered to mud extrusion molding orifice plate by screw feeder, be squeezed into strip through mud extrusion molding orifice plate, cut into particulate state through rotating blade then, enter spouted bed, the hot gas medium enters spouted bed from spouted wind inlet mouth, form a stable jeting area in spouted bed bottom, the hot gas medium is upward through spouted zone and forms counter current contact with the mud granule that moves downward, mud granule forms cyclic motion clocklike in spouted bed, wet mud granule is strengthened moulding and preliminarily dried, mud shaped granule behind the preliminarily dried flows into the fluidized-bed bottom from spouted bed lower openings, another part hot gas medium enters fluidized-bed from the fluidized wind inlet mouth, mud granule is under the effect of hot gas medium, present fluidized state, mud granule is carried out the deep dehydration drying, finishing the moisture that the hot gas medium after the heat exchange carries in the mud discharges from the humid gas venting port that contains at spouted fluidized bed top, the dewatered sludge particle that evaporates behind the moisture is discharged fluidized-bed through the overflow port of spouted fluidized bed, enter dewatered sludge particle feed bin, in whole mud granulizing drying process, the temperature of spouted bed and fluidized-bed is in 105 ℃～350 ℃.Described hot gas medium is air, flue gas, water vapour or other gas.

In the described mud granulizing drying means, in spouted fluidized bed, adopt central dividing plate, spouted fluidized bed is drawn spouted bed and two zones of fluidized-bed that are divided into maintenance connection up and down, prevention directly flows into dewatered sludge particle feed bin from the spouted fluidized bed bed face from the wet mud granule that the screw extrusion granule-forming machine comes out, promptly utilize central dividing plate, to enter spouted bed downwards from spouted bed bed face from the wet mud granule that the screw extrusion granule-forming machine comes out, mud granule behind the preliminarily dried flows into the fluidized-bed bottom from spouted bed lower openings, move upward to the fluidized bed laminar surface then, overflow fluidized-bed at last, enter dewatered sludge particle storehouse, this method significant prolongation the residence time of mud granule in spouted bed and fluidized-bed, especially mud granule contacts with the hot gas medium counter flow in spouted bed, impels the abundant granulating and drying of mud.

Beneficial effect: in the fluidized bed dryer of routine, the wet mud behind the mechanical dehydration easily bonding is agglomerating, causes the fluidized bed dryer can't works better, and along with the rising of mud temperature, wet mud bonding agglomeration is even more serious; On the other hand, conventional fluidized bed dryer is unfavorable for the mud granulizing drying because particle layers structure coalescence inhomogeneous, bubble causes an interior channel, undesired fluidisation phenomenon such as turbulent.

The utility model is a kind of method of mud granulizing exsiccant, be specially the mud that to wet and be delivered to mud extrusion molding orifice plate by screw feeder, be squeezed into strip through mud extrusion molding orifice plate, cut into particulate state through rotating blade then, enter spouted bed downwards from spouted bed bed face, the hot gas medium enters spouted bed from spouted wind inlet mouth, form a stable jeting area in spouted bed bottom, jet flow stream is upward through spouted zone and forms counter current contact with the mud granule that moves downward, mud granule forms cyclic motion clocklike in spouted bed, help handling the strong mud material of stickiness, be convenient to mud granule and further strengthen moulding, simultaneously, enter wet mud granule and hot gas medium in the spouted bed, the bed material is violent to be mixed, intensive heat and mass exchange take place, make the wet mud granule instantaneously heating that has just entered bed to the interior temperature of bed, the moisture evaporation that will wet in the mud granule is come out, mud shaped granule behind the preliminarily dried flows into the fluidized-bed bottom from spouted bed lower openings, another part hot gas medium enters fluidized-bed from the fluidized wind inlet mouth, mud granule is under the effect of hot gas medium, present fluidized state, mud granule is carried out the deep dehydration drying, dried mud granule moves upward to the fluidized bed laminar surface from the fluidized-bed bottom, discharge fluidized-bed through the overflow port of spouted fluidized bed then, enter dewatered sludge particle feed bin, finish the moisture that the hot gas medium after the heat exchange carries in the mud and discharge from the humid gas venting port that contains at spouted fluidized bed top.This technology not only makes mud obtain minimizing and handles, and is convenient to the follow-up resource utilization development and use of mud.

Description of drawings

Fig. 1 is an apparatus structure synoptic diagram of the present utility model, wherein has: screw extrusion granule-forming machine 1, transmission shaft 11, screw feeder 12, mud extrusion molding orifice plate 13, rotating blade 14, spouted fluidized bed 2, the central dividing plate 21 of spouted fluidized bed, the spouted bed 22 of spouted fluidized bed, the fluidized-bed 23 of spouted fluidized bed, the overflow port 24 of spouted fluidized bed, dewatered sludge particle feed bin 3, spouted wind inlet mouth A, fluidized wind inlet mouth B contains humid gas venting port C.

Embodiment

Mud granulizing drying installation of the present utility model, be by screw extrusion granule-forming machine 1, spouted fluidized bed 2 and dewatered sludge particle feed bin 3 are formed, wherein screw extrusion granule-forming machine 1 is by transmission shaft 11, screw feeder 12, mud extrusion molding orifice plate 13 and rotating blade 14 are formed, mud extrusion molding orifice plate 13 is fixed in the screw feeder 12 downstream housings, transmission shaft 11 passes through mud extrusion molding orifice plate 13 and rotating blade 14 links, with central dividing plate 21 with 2 strokes of spouted fluidized beds be divided into up and down keep being communicated with about two zones, correspond to spouted bed 22 and fluidized-bed 23 respectively, the bottom of spouted bed is spouted wind inlet mouth A, the bottom of fluidized-bed is fluidized wind inlet mouth B, the middle part of spouted fluidized bed 2 is an overflow port 24, and the top of spouted fluidized bed 2 is for containing humid gas venting port C.

The mud that will wet is delivered to mud extrusion molding orifice plate 13 by screw feeder 12, be squeezed into strip through mud extrusion molding orifice plate 13, cut into particulate state through rotating blade 14 then, enter spouted bed 22 downwards from spouted bed 22 bed faces, the hot gas medium enters spouted bed 22 from spouted wind inlet mouth A, form a stable jeting area in spouted bed 22 bottoms, jet flow stream is upward through spouted zone and forms counter current contact with the mud granule that moves downward, mud granule forms cyclic motion clocklike in spouted bed 22, the Rapid Cycle stirring of particle helps the mud material and further strengthens moulding, simultaneously, enter wet mud granule and hot gas medium in the spouted bed 22, bed material particle acutely mixes, intensive heat and mass exchange take place, make that just having entered the mud granule instantaneously heating of wetting in the spouted bed 22 arrives temperature in the bed, the moisture evaporation that will wet in the mud granule is come out, mud shaped granule behind the preliminarily dried flows into fluidized-bed 23 bottoms from spouted bed 22 lower openings, another part hot gas medium enters fluidized-bed 23 from fluidized wind inlet mouth B, mud granule is under the effect of hot gas medium, present fluidized state, mud granule is carried out the deep dehydration drying, dried mud granule moves upward to fluidized-bed 23 bed faces from fluidized-bed 23 bottoms, discharge fluidized-bed 23 through the overflow port 24 of spouted fluidized bed 2 then, enter dewatered sludge particle feed bin 3, finish the moisture that hot gas medium after the heat exchange carries in the mud and discharge from the humid gas venting port C that contains at spouted fluidized bed 2 tops.

The central dividing plate 21 of spouted fluidized bed is divided into 2 strokes of spouted fluidized beds in spouted

bed

22 and 23 two zones of fluidized-bed that keep connection up and down, prevention directly flows into dewatered sludge particle feed bin 3 from spouted fluidized bed 2 bed faces from the wet mud granule that screw extrusion granule-forming machine 1 comes out, promptly utilize central dividing plate 21, to enter spouted bed 22 downwards from spouted bed 22 bed faces from the wet mud granule that screw extrusion granule-forming machine 1 comes out, the hot gas medium enters spouted bed 22 from spouted wind inlet mouth A, form counter current contact with the mud granule that moves downward, mud granule forms cyclic motion clocklike in spouted bed 22, mud shaped granule behind the preliminarily dried flows into fluidized-bed 23 bottoms from spouted bed 22 lower openings, move upward to fluidized-bed 23 bed faces from fluidized-bed 23 bottoms then, overflow port 24 through spouted fluidized bed overflows fluidized-bed 23.This method significant prolongation the residence time of mud in spouted bed 22 and fluidized-bed 23, especially mud granule contacts with the hot gas medium counter flow in spouted 22, impels the abundant granulating and drying of mud.

In whole mud granulizing drying process, the temperature of spouted bed 22 and fluidized-bed 23 is in 105 ℃～350 ℃ temperature.

Claims

1. a mud granulizing drying installation is characterized in that this device comprises screw extrusion granule-forming machine (1), spouted fluidized bed (2) and dewatered sludge particle feed bin (3); Wherein, screw extrusion granule-forming machine (1) comprises transmission shaft (11), screw feeder (12), mud extrusion molding orifice plate (13) and rotating blade (14), mud extrusion molding orifice plate (13) is fixed in the housing of screw feeder (12) downstream, and transmission shaft (11) passes mud extrusion molding orifice plate (13) and links with rotating blade (14); The outlet of screw extrusion granule-forming machine (1) connects spouted fluidized bed (2), spouted fluidized bed (2) is drawn spouted (22) and (23) two zones of fluidized-bed that are divided into maintenance connection up and down with central dividing plate (21), the bottom of spouted bed (22) is a spouted wind inlet mouth (A), the bottom of fluidized-bed (23) is fluidized wind inlet mouth (B), the middle part of fluidized-bed (23) is overflow port (24), and overflow port (24) links with dewatered sludge particle feed bin (3); The top of this spouted fluidized bed (2) is for containing humid gas venting port (C).

2. mud granulizing drying installation according to claim 1, the perforate that it is characterized in that described mud extrusion molding orifice plate (13) are circular, oval, square or Polygons, or difform combination.