CN209974591U - Multilayer combination formula sludge drying device that falls certainly - Google Patents
Multilayer combination formula sludge drying device that falls certainly Download PDFInfo
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- CN209974591U CN209974591U CN201920785181.1U CN201920785181U CN209974591U CN 209974591 U CN209974591 U CN 209974591U CN 201920785181 U CN201920785181 U CN 201920785181U CN 209974591 U CN209974591 U CN 209974591U
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Abstract
The utility model discloses a multilayer combination gravity type sludge drying device, including sludge drying machine, pre-heater, steam generator, filter, steam or separation of water buffer tank, vapor compressor, compressor cooling water pump, sealed discharging device, pipeline and valve etc.. The sludge dryer is mainly formed by combining a plurality of indirect dryer modules, the running mode of the sludge in the dryer is in a self-falling state, and the energy consumption required by mechanical operation can be greatly reduced. The inner cavity of the indirect dryer is high-temperature steam, and sludge is indirectly heated and dried; recovering condensed water generated in the cavity, introducing the recovered condensed water into a preheater, and preheating and impurity removing wet sludge; the secondary steam generated in the dryer becomes a new heat source for indirect heating in the cavity and bottom convection drying after being filtered, compressed and superheated. The device has reduced mechanical operation energy consumption and has avoided gluing the wall phenomenon, and the whole latent heat and the sensible heat of secondary steam are showing to the simultaneous recycle drying process, energy-conserving effect.
Description
Technical Field
The utility model relates to a sludge drying technology field especially relates to a multilayer combination is from formula sludge drying device that falls.
Background
The reduction of the water content in the sludge is an effective way for sludge reduction treatment, and the effective way for reducing the water content is to evaporate the water in the sludge by utilizing heat energy to achieve the purpose of rapid drying. The sludge drying process involves a drying device, energy consumption, drying rate, secondary product treatment and the like. Particularly, a large amount of energy consumption is required to be consumed in the drying process of the sludge, and the drying process becomes more complicated due to the characteristics of complex components, high water content and the like of the sludge; the sludge is condensed in the early drying stage, and the water content of the sludge is increased in the stage, so that the drying efficiency of the sludge is reduced.
Contain stickness material such as organic matter in the mud, this makes mud can appear blockking up in the transportation, produces sticky wall phenomenon easily, and sticky wall problem all exists in trades such as chemical industry, pharmacy, food processing and textile industry, and the sticky wall problem of material not only increases the heat transfer thermal resistance when drying in the drying process, reduces drying efficiency, and can cause drying equipment potential safety hazard.
According to the literature: sludge superheated steam thin-layer drying characteristic and drying model construction [ J ], agricultural engineering journal, Zhang Shunku, Sunrech, Wang Cheng, etc., 2014, 30 (14): 258-266, it can be seen that the condensation characteristic exists in the initial stage of superheated steam drying, which is negative for the drying process, because the steam condensation increases the moisture content of the material, prolonging the time of the whole drying process. Research on drying shrinkage characteristics of superheated steam and hot air of sludge [ D ], university of Nanchang aviation, Wenxiangdong, 2016 (Kangdong corporation), shows that the reduction of the water content in sludge directly affects the volume of the sludge, and the lower the water content is, the smaller the volume of the sludge is. Research on adhesiveness in the drying process of urban sludge [ D ], tianjin university, liu feng, 2008 shows that in the initial drying stage, the drying process all occurs on the outer surface of sludge, as moisture evaporates the inside space of sludge, the sludge enters the volume reduction stage, as the volume reduction is performed, the surface tension of sludge is reduced, the viscosity is reduced, and cracks appear on the surface.
The application progress and technical key points of the domestic and foreign sludge thermal drying process [ J ], Chinese water supply and drainage, Wangxingrun, 2007, 23(8):5-8, it is known that the indirect heat conduction drying can recycle the drying medium, but the wall adhesion is easily generated at the stage of high water content of the sludge, which results in large heat transfer resistance, high energy consumption and low drying efficiency. The study on indirect thin-layer drying of sludge and thermal pressure coupling dehydration drying [ D ], university of great graduate, Wangweiyun, 2012 finds that the moisture content of the sludge is reduced more rapidly closer to a heat transfer surface when the partition wall is dried. According to the research of the sludge wall-sticking influence factor experiment and the analysis of the wall-sticking mechanism [ D ], Tianjin university, Wu megafine 2007, the most main reason for the wall-sticking generation during the indirect drying of the sludge is the sludge moisture content.
Teflon is also called Polytetrafluoroethylene (PTFE) and has the comprehensive properties of high temperature resistance, corrosion resistance, non-sticking, self-lubrication and low friction coefficient, and the wall sticking phenomenon can be effectively reduced by coating Teflon on a drying device. When mud and heating surface contact, make mud and the quick mummification of the mud thin layer of heating surface contact part, the moisture content descends, and contact part contracts fast, forms the steam film simultaneously between heating surface and mud shrink face, also can effectively prevent the wall sticking phenomenon, increases drying efficiency.
The steam has the advantages of good heat capacity, strong moisture absorption capacity, no mass transfer resistance and the like, so that heat-conducting substances such as rollers and the like are quickly heated, and meanwhile, condensed water generated after heat transfer of the steam optionally contains condensation heat and can be recycled.
The prior device and method for energy-saving drying treatment of sludge are as follows:
chinese patent CN 203741205U discloses an indirect vertical type multilayer sludge dryer, wherein an air outlet is arranged at the top of a sludge inlet end of the vertical type multilayer sludge dryer, and an air inlet is arranged at the bottom of the vertical type multilayer sludge dryer; can further reduce the water content of the sludge, form granular dry sludge, is easy to utilize sludge resources, and has the characteristics of indirect heating, closed air steam circulation and less waste steam generation.
Chinese patent CN 200989712 discloses a vertical sludge dryer, the drying tower is designed to be vertical, sludge enters the tower from the top of the drying tower and falls freely, the power required for conveying is saved, hot air is conveyed from bottom to top, sludge is conveyed from top to bottom, and the two form a cross flow. The sludge in the drying tower is uniformly mixed with the hot air, the drying time is greatly shortened under the action of heat, the water content of the sludge is reduced from 60 percent to below 30 percent, and therefore the dried sludge becomes non-viscous hard block particles.
Chinese patent CN 102260033 a discloses a multistage drying method of secondary steam compression for sludge, which introduces secondary steam generated by sludge drying into a steam/water separation buffer tank and then enters a steam compressor, so that steam is reused as a heat source for the next stage of drying.
Chinese patent CN 1686876 a discloses a method for drying sludge by superheated steam and a drying device thereof, in the method, latent heat and sensible heat of drying tail steam are recovered by a heat exchanger to exchange heat with water, and then the hot water is heated to be superheated steam.
Chinese patent CN 205222968U discloses an energy-saving sludge drying device using waste heat, which has a spiral groove on the heat collecting coil pipe, which is concave towards the pipe body, to ensure the contact area and improve the heat exchange efficiency. Utilize solar energy with the water solarization heat, through insolate pond heating production heat energy, waste heat recovery system retrieves heat energy, reduces the consumption of conventional energy, pollution-free.
Chinese patent CN 206828352U discloses a waste water sludge treatment recovery unit, and the device has reduced the viscidity of mud through heating mud in mud transmission process, has not only reduced the volume of mud adhesion on conveyer, still is favorable to drawing mud, has solved the inconvenient problem of mud transmission.
Chinese patent CN 107148814A discloses a coupling bionic drag reduction and viscosity reduction plowshare, which comprises a plowshare main body and a bionic claw toe, wherein the surface of the plowshare is coated with a polytetrafluoroethylene coating, and the cross section profile of the bionic claw toe monomer consists of three curves, so that the resistance of a soil contact part can be effectively reduced, and the adhesion of the sticky and wet soil is greatly reduced.
Chinese patent CN 207159076U discloses a shock attenuation stirring formula chemical sludge drying device drives the epaxial second drive wheel of transmission by the motor and rotates, drives first drive wheel through the drive belt and rotates, drives the rotatory sludge that drives the semicircular stirring vane rotation and stir the arc position in the sludge drying jar of (mixing) shaft, drives straight stirring vane and stirs the mud of sludge drying jar central position, drives to scrape the rotatory mud of scraping the mud on the sludge drying jar inner wall of flitch.
Chinese patent CN 204079744U discloses a double-shaft hollow blade dryer, which adopts two hollow shafts and a mode of reverse rotation of blades, and a scraper is arranged on the blades, so that when sludge is dried in the dryer, the reverse rotation of the blades cuts the sludge, the wall sticking condition of the sludge is reduced, the drying efficiency of the sludge is enhanced, and the bad phenomena of shaft sticking, caking and the like of the sludge can be prevented without back mixing during the sludge drying.
Chinese patent CN 2058034U discloses a method for designing wedge-shaped hollow blades to be mutually engaged and installed on two adjacent shafts, introducing steam into the shafts to conduct heat conduction and drying on sludge, and when sludge is adhered to the equipment, the blades are engaged with each other to achieve the effect of mutual cleaning, thereby reducing the adverse effect of sludge adhesion on drying and enhancing the heat transfer effect.
Chinese patent CN 106219936A discloses that the structure of the blade is changed to make the blade perform reciprocating translational motion and vibration in the fixed area of the shaft, thereby achieving the purpose of removing sludge adhered to the shaft and the blades.
Chinese patent CN 206359409U discloses an anti-adhesion sludge dryer, which is characterized in that a plurality of parallel hollow shafts alternately provided with hollow discs are arranged in a dryer cylinder, and a sludge scraping sheet is arranged at one end of each hollow disc, so that the sludge can be scraped and peeled by adjusting the inclination angle of each hollow disc, the sludge adhesion is reduced, and the sludge drying efficiency is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multilayer combination is from falling formula sludge drying device to solve among the above-mentioned prior art mud at drying process energy consumption height, equipment complicacy, maintenance difficulty, glutinous wall, drying rate slow scheduling problem.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides a multilayer combination gravity-type sludge drying device, including preheater, sludge drying machine, steam recovery mechanism and steam generator, the bottom of preheater pass through mud conveying equipment with sludge drying machine's mud feed inlet intercommunication, sludge drying machine includes the drying chamber and sets up in the multilayer indirect dryer in the drying chamber, indirect dryer includes a set of pair roller, open the roller surface of pair roller has annular slot, the roller is equipped with the joint of being connected with steam conduit and condensate water pipeline in its axial, the bottom of drying chamber is equipped with mud discharge gate and convection current steam inlet; the top end of the drying chamber is also provided with a secondary steam outlet, the secondary steam outlet is communicated with the steam recovery mechanism through a pipeline, and a heater in the steam recovery mechanism is communicated with the drying chamber after being converged with a gas outlet of the steam generator.
Further, the preheater comprises a sludge bin and a drying module, the sludge bin is arranged at the top of the drying module, the drying module comprises a group of pair rollers, and joints connected with a condensed water pipeline are axially arranged on the pair rollers; the bottom of the drying module is connected with the sludge conveying equipment.
Furthermore, the annular grooves are uniformly distributed on the surface of the roller, the width of each groove is larger than the distance between every two adjacent grooves, and the wall surfaces of the annular grooves are provided with demoulding angles and round corners.
Furthermore, the number of the layers of the indirect dryer is 5, the layers are vertically arranged from top to bottom, the surfaces of the rollers of the indirect dryer on the third layer and the fourth layer are sprayed with anti-adhesion materials, and the anti-adhesion materials are Teflon materials.
Further, the sludge discharge port is connected with a two-stage sealing discharge structure, and the sealing discharge structure comprises a rotary valve.
Further, the steam recovery mechanism comprises a filter, a first steam or water separation buffer tank, a steam compressor, a second steam or water separation buffer tank and a heater which are connected in sequence.
Furthermore, a pipeline connected with the condensed water pipeline and a cooling pipeline connected with the vapor compressor are arranged on the first steam or water separation buffer tank, and a compressor cooling water pump is arranged on the cooling pipeline.
Furthermore, the air outlets of the heater and the steam generator are converged and then connected with a branch cylinder, and the air outlet of the branch cylinder is respectively connected with the steam pipeline and the convection steam inlet; and a drain valve is arranged on the condensed water pipeline.
The drying method applied to the multilayer combined gravity type sludge drying device comprises the following steps:
(1) wet sludge passes through a preheater and then enters sludge conveying equipment;
(2) the preheated sludge enters a sludge dryer from a sludge feeding hole and is dried by a multi-layer indirect dryer with steam;
(3) secondary steam in a secondary steam outlet positioned at the top of the dryer sequentially passes through a filter, a steam or water separation buffer tank I, a steam compressor, a steam or separation buffer tank II and a heater, the recovered secondary steam is converged with the steam in the steam generator, and is introduced into an inner cavity of the indirect dryer through an inlet of a steam pipeline of each layer of indirect dryer through a part of the branch cylinder to release condensation heat for indirect heat conduction drying, and the other part of the secondary steam is subjected to convection drying on sludge of each layer from bottom to top through a convection steam inlet;
(4) the dried sludge is discharged from a sludge discharge port of the sludge dryer through a two-stage sealing discharge structure.
The utility model discloses for prior art gain following technological effect:
1. the movement direction of the sludge in the dryer is the same as the gravity direction, and the dryer only needs a small amount of mechanical energy to rotate slowly;
2. before entering the sludge drying unit, the sludge is subjected to impurity removal and preheating treatment by the preheater, so that the device can be protected, the sludge circulation is increased, the sludge can be prevented from being blocked in a sludge pump, the phenomenon of condensation of the sludge in the primary drying stage of the sludge drying unit is reduced, and the drying efficiency is accelerated;
3. superheated steam is a drying medium, mass transfer resistance is avoided, and incrustation on the surface of sludge is not easy to occur, so that further evaporation of water is facilitated;
4. the inner cavity of a pair roller of the indirect dryer is high-temperature steam, so that the sludge is rapidly dried and contracted and a steam diaphragm is generated between the sludge and the surface of the roller, and the sludge falls off and enters the next layer of indirect dryer under the action of gravity and the rotation of the pair roller;
5. one part of condensed water generated by the steam/water separation buffer tank is used for cooling the steam compressor, so that the problem of overhigh exhaust temperature of the steam compressor is solved, a main water injection pipeline of the steam compressor can be prevented from being broken down, and the compressor is effectively prevented from being dried and burned when water is cut off;
6. condensed water generated in the indirect dryer and condensed water generated in the steam/water separation buffer tank are directly used for preheating sludge raw materials in the sludge bin, and part of sensible heat is recovered;
7. the secondary steam is purified by adopting a filter and a steam/water separation buffer tank, so that exhaust steam is purified and a compressor is protected;
8 when the sludge reaches the indirect dryers on the third layer and the fourth layer, the viscosity of the sludge reaches the maximum in the drying middle period, and the sludge passes through the indirect dryer with the Teflon material sprayed on the surface, so that a steam film formed between the sludge thin layer and the Teflon coating layer after the sludge thin layer is heated in a short time and loses a large amount of moisture can smoothly pass through a drying viscous area, and the wall adhesion phenomenon in the sludge drying process is avoided;
9. the heating interface formed by the Teflon coating has low surface friction coefficient, low surface energy, self-lubrication, high temperature resistance, corrosion resistance and good heat transfer capacity, and reduces the heat loss when a steam heat source transfers heat to sludge;
10. due to the low surface energy characteristic of the Teflon coating and the low water content of the sludge near the heating surface, the adhesive in the sludge cannot completely wet the heating surface through the water in the sludge, and the wall adhesion effect generated by the sludge and the heating surface is further reduced;
11. recovering all latent heat and sensible heat in the secondary steam as a new heat source for indirect drying and convection drying after the secondary steam is recovered;
12. the sludge dryer is in a modular design, and is convenient to manufacture and maintain;
13. non-condensable gas in the secondary steam is treated in a filter;
14. the sludge is extruded into strips, so that the transportation and treatment of the sludge are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the multi-layer combined gravity type sludge drying device of the present invention;
FIG. 2 is a schematic view of a sludge dryer;
FIG. 3 is a three-dimensional view of a combination of 5 level indirect dryer modules;
FIG. 4a is a schematic view showing the phenomenon of sludge shrinking before heating, and FIG. 4b is a schematic view showing the phenomenon of sludge shrinking after heating;
FIG. 5 is a partial enlarged view of the sludge rapid heating stage of the heating surface of the indirect dryer;
wherein, 1, a sludge dryer; 1-1 sludge feed inlet; 1-2 secondary steam outlets; 1-3 steam pipe inlets; 1-4 convection steam inlets; 1-5 sludge discharge ports; 1-6 condensed water pipeline inlets; 1-7 condensed water pipeline outlets; 2, a preheater; 3 a sludge injection pump; 4, a filter; 5, separating steam or water in a first buffer tank; 6, a vapor compressor; 7, a second steam or water separation buffer tank; 8, a compressor cooling water pump; 9 a heater; 10, a steam generator; 11, dividing a cylinder; 12 sealing the discharging structure; 13 a drain valve; a. b, c and d are valves; a, an indirect dryer; b, spraying a Teflon coating indirect dryer; b-1, heating the cylinder body; b-2 Teflon coating; b-3, a vapor film; b-4, sludge close to the heating surface; b-5 sludge; c is the barrel surface of the indirect heater; wherein the pipeline between 1-6 and 1-7 is a condensed water pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a multilayer combination is from falling formula sludge drying device to solve among the above-mentioned prior art mud at drying process energy consumption height, equipment complicacy, maintenance difficulty, glutinous wall, drying rate slow scheduling problem.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1-5, fig. 1 is a schematic structural view of the multi-layer combined gravity type sludge drying device of the present invention; FIG. 2 is a schematic view of a sludge dryer; FIG. 3 is a three-dimensional view of a combination of 5 level indirect dryer modules; FIG. 4a is a schematic view showing the phenomenon of sludge shrinking before heating, and FIG. 4b is a schematic view showing the phenomenon of sludge shrinking after heating; fig. 5 is a partial enlarged view of the sludge rapid heating stage of the indirect dryer heating surface.
As shown in fig. 1-5, the utility model provides a multilayer combination gravity type sludge drying device, as shown in fig. 2 is the sludge dryer sketch map, the device adopts the modularized design, connects the combination of dry module for 5 grades as shown in the figure and forms, connects the combination of desicator module for 5 grades as shown in fig. 3 and forms three-dimensional figure, wherein 3 rd and 4 th grade module heater barrel surface spraying have antiseized material. After the indirect dryer module units are combined, as shown in figure 3, the indirect dryer module units are arranged in a closed box body, a sludge feeding hole 1-1 is arranged at the top of the dryer and connected with a sludge injection pump 3, and a secondary steam outlet 1-2 is sequentially connected with a filter 4, a steam or water separation buffer tank I5, a steam compressor 6, a steam or water separation buffer tank II 7 and a heater 9. The bottom of the dryer is provided with a sludge discharge port 1-5 connected with a two-stage sealing discharge structure 12 and a convection steam inlet 1-4 connected with a steam outlet of a branch cylinder 11. The axial direction of each level of indirect dryer A is provided with a rotary joint which is connected with a steam pipeline inlet 1-3 and a condensed water pipeline inlet 1-6, and further the steam pipeline inlet 1-3 is connected with a steam outlet of the air distributing cylinder 11.
The exhaust port of the steam generator 10 and the exhaust port of the heater 9 are mixed and then connected to the steam inlet of the cylinder 11.
The lower part of the preheater 2 is a module unit of a large indirect dryer, the axial direction of the module unit is provided with a rotary joint connected with a condensation pipe, and the joint is connected with the outlets 1-7 of a condensation water pipeline. Furthermore, a condensed water pipeline is arranged between the inlet 1-6 of the condensed water pipe and the outlet 1-7 of the condensed water pipe, and a drain valve 13 is arranged on the condensed water pipeline.
And condensed water outlets generated by the first steam/water separation buffer tank and the second steam/water separation buffer tank are connected with a condensed water pipeline, wherein the condensed water outlet of the first steam/water separation buffer tank 5 is connected with a compressor cooling pump 8 and then is connected with a cooling water spray head pipeline of a steam compressor 6.
The embodiment also provides a multilayer combination gravity type sludge drying method, which utilizes the multilayer combination gravity type sludge drying device to perform drying work, and specifically comprises the following steps:
after entering from a sludge feed port 1-1, the sludge moves downwards under the action of gravity and the rotation of the rotating roller; one part of steam in the branch cylinder enters an inner cavity of the indirect dryer from a steam pipeline inlet 1-3 for indirect heating and drying, and simultaneously, one part of steam carries out convection drying on sludge from top to bottom from the bottom of the dryer from a convection steam inlet 1-4. The sludge is quickly dried in the dryer 1 due to the quick heat transfer of the indirect dryer A, so that the volume shrinkage phenomenon occurs and a steam diaphragm is generated between the sludge and the cylinder surface C, and as shown in figure 4, the volume change phenomenon occurs before and after the sludge is heated in the indirect dryer.
Earlier stage mud is in the constant speed drying stage, and the moisture content is higher, and the mud stickness is little, reaches the middle stage mud stickness and reaches the biggest, has spouted teflon coating indirect drying ware B this moment.
As shown in figure 5, a partial enlarged view of a sludge rapid heating stage of a heating surface of an indirect dryer is shown, the outer surface of a cylinder B-1 of the heater is coated with a Teflon coating B-2 with low surface energy, and by the process, the surface energy of the heating surface is reduced while the heat transfer efficiency is ensured, and the wall sticking effect of sludge and the sludge heating surface is reduced.
In the sludge viscosity-reducing indirect drying stage in the middle drying period, the normal-temperature sludge enters the sludge indirect heating stage when contacting with the indirect heating surface, as shown in figure 4, the surface drying rate of the sludge B-4 close to the heating surface is much faster than that of the sludge B-5, the volume of the sludge B-4 close to the heating surface is suddenly reduced after the water content is sharply reduced, and a steam film B-3 is formed between the sludge B-4 close to the heating surface and the low-surface-energy Teflon coating B-2, so that the sludge B-5 is separated from the heating surface for a short time, and the separation of the sludge and the heating surface is facilitated. Due to the rapid reduction of the water content of the sludge near the heating surface and the low surface energy characteristic of the heating surface, the adhesive substances in the sludge B-5 can not be in good contact with the heating surface and can not form the wall-sticking effect, so the wall-sticking effect of the sludge and the heating surface can be greatly reduced.
Meanwhile, condensed water generated in the cavity of the indirect dryer is discharged from inlets 1-6 of a condensed water pipeline and is introduced into the preheater 2 through the drain valve 13 to preheat and remove impurities from wet sludge in the sludge bin, so that the fluidity of the sludge can be increased, the sludge is prevented from entering the sludge injection pump 3 to cause a blocking phenomenon and a condensation phenomenon at the early drying stage in the dryer 1, and the drying efficiency is improved; meanwhile, the preheater 2 can also achieve the purposes of impurity removal and equipment protection.
Secondary steam generated in the sludge dryer 1 is discharged into a filter 4 from a secondary steam outlet 1-2 to remove impurities such as dust in the steam, and then is introduced into a steam or water separation buffer tank to remove water drops in the steam; the enthalpy value and the temperature of the secondary steam are increased through a steam compressor 6, and then the secondary steam is introduced into a steam or water separation buffer tank II to remove water drops after compression; after being properly superheated by the heater 9, the mixture is used as a new heat source after being mixed with the primary steam supplemented by the steam generator 10, and after passing through the branch cylinder 11, a part of the mixture enters the inner cavity of the dryer from the indirect steam pipeline inlet 1-3, and a part of the mixture enters from the convection steam inlet 1-4.
The secondary steam passing through the filter 4 and the steam or water separator buffer tank I6 can remove dust and water drops, protect the steam compressor 6 and prolong the service life of the compressor. Meanwhile, the problem of overhigh exhaust temperature can occur when the steam compressor 6 works for a long time, so that one part of condensed water in the steam or water separation buffer tank 6 is subjected to protective water spray cooling on the steam compressor 6 through the compressor cooling water pump 8, and the other part of condensed water is used for preheating the raw material of the preheater 2.
After the indirect drying of the multilayer indirect dryer A and the convection drying of convection steam in the dryer 1, sludge is discharged from the sludge discharge port 1-5 through the two-stage sealing discharge structure 12.
The sludge dryer is mainly formed by combining a plurality of indirect dryer modules, compared with paddle type drying and disc type drying equipment, the operation mode of sludge in the dryer is in a self-falling state, the gravity direction of the sludge is the same as the movement direction of the sludge, and the energy consumption required by mechanical operation can be greatly reduced. The inner cavity of the indirect dryer is high-temperature steam, sludge is indirectly heated and dried, the water content of the sludge is reduced by rapid heating, the volume is reduced, the sludge shrinks towards the center, and a steam diaphragm is formed between the sludge and the heater 9, so that the viscosity is reduced; the condensed water generated in the cavity is recycled and then is introduced into a preheater 2, and the wet sludge is preheated and subjected to impurity removal treatment; secondary steam generated in the dryer becomes a new heat source for indirect heating in the cavity and bottom convection drying after being filtered, compressed and superheated; the heating contact surface of the indirect dryer between the third layer and the fourth layer is coated with the Teflon coating with low surface energy, so that when the viscosity of the sludge is maximum in the middle of drying, the sludge can smoothly pass through the indirect dryer, and the wall adhesion phenomenon is avoided. The device can adopt a modular design method, is convenient to install and manufacture, reduces the mechanical operation energy consumption, avoids the wall sticking phenomenon, simultaneously recycles all latent heat and sensible heat of secondary steam generated in the drying process, and has obvious energy-saving effect.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. The utility model provides a multilayer combination gravity type sludge drying device which characterized in that: the sludge drying device comprises a preheater, a sludge drying machine, a steam recovery mechanism and a steam generator, wherein the bottom end of the preheater is communicated with a sludge feeding hole of the sludge drying machine through sludge conveying equipment, the sludge drying machine comprises a drying chamber and a multi-layer indirect dryer arranged in the drying chamber, the indirect dryer comprises a group of rollers, annular grooves are formed in the surfaces of rollers of the rollers, joints connected with a steam pipeline and a condensed water pipeline are arranged on the rollers in the axial direction of the rollers, and a sludge discharging hole and a convection steam inlet are formed in the bottom end of the drying chamber; the top end of the drying chamber is also provided with a secondary steam outlet, the secondary steam outlet is communicated with the steam recovery mechanism through a pipeline, and a heater in the steam recovery mechanism is communicated with the drying chamber after being converged with a gas outlet of the steam generator.
2. The multi-layer combined gravity type sludge drying device according to claim 1, wherein: the preheater comprises a sludge bin and a drying module, the sludge bin is arranged at the top of the drying module, the drying module comprises a group of pair rollers, and joints connected with condensed water pipelines are axially arranged on the pair rollers; the bottom of the drying module is connected with the sludge conveying equipment.
3. The multi-layer combined gravity type sludge drying device according to claim 1, wherein: the annular grooves are uniformly distributed on the surface of the roller, the width of each groove is larger than the distance between every two grooves, and the wall surfaces of the annular grooves are provided with demoulding angles and round corners.
4. The multi-layer combined gravity type sludge drying device according to claim 1, wherein: the number of layers of the indirect dryer is 5, the indirect dryer is vertically arranged from top to bottom, the surfaces of the rollers of the indirect dryer on the third layer and the fourth layer are sprayed with anti-adhesion materials, and the anti-adhesion materials are Teflon materials.
5. The multi-layer combined gravity type sludge drying device according to claim 1, wherein: the sludge discharge port is connected with the two-stage sealing discharge structure, and the sealing discharge structure comprises a rotary valve.
6. The multi-layer combined gravity type sludge drying device according to claim 1, wherein: the steam recovery mechanism comprises a filter, a first steam or water separation buffer tank, a steam compressor, a second steam or water separation buffer tank and a heater which are sequentially connected.
7. The multi-layer combined gravity type sludge drying device according to claim 6, wherein: and a pipeline connected with the condensed water pipeline and a cooling pipeline connected with the vapor compressor are arranged on the first steam or water separation buffer tank, and a compressor cooling water pump is arranged on the cooling pipeline.
8. The multi-layer combined gravity type sludge drying device according to claim 1, wherein: the air outlets of the heater and the steam generator are converged and then connected with the air distribution cylinder, and the air outlet of the air distribution cylinder is respectively connected with the steam pipeline and the convection steam inlet; and a drain valve is arranged on the condensed water pipeline.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110040935A (en) * | 2019-05-28 | 2019-07-23 | 南昌航空大学 | A kind of multiple layer combination gravity type sludge drying mechanism and drying means |
| CN114163099A (en) * | 2021-11-29 | 2022-03-11 | 上海发电设备成套设计研究院有限责任公司 | Manifold type sludge drying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110040935A (en) * | 2019-05-28 | 2019-07-23 | 南昌航空大学 | A kind of multiple layer combination gravity type sludge drying mechanism and drying means |
| CN114163099A (en) * | 2021-11-29 | 2022-03-11 | 上海发电设备成套设计研究院有限责任公司 | Manifold type sludge drying system |
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