CN211394252U

CN211394252U - Sludge drying equipment

Info

Publication number: CN211394252U
Application number: CN201921296702.3U
Authority: CN
Inventors: 江艳存; 王贵山
Original assignee: Zhaoyuan Huichao New Energy Technology Co ltd
Current assignee: Zhaoyuan Huichao New Energy Technology Co ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-09-01
Anticipated expiration: 2029-08-08

Abstract

The application provides a sludge drying device. The apparatus comprises: the mixing device is used for mixing the liquid absorption particles with sludge slurry to be dried to obtain a mixture, and liquid of the sludge slurry to be dried in the mixture is absorbed by the liquid absorption particles; and an extruding device for extruding the mixture, the liquid-absorbing particles being compressed and discharging liquid. The equipment reduces the liquid content of the dried sludge.

Description

Sludge drying equipment

Technical Field

The application relates to the technical field of sludge drying treatment, in particular to a sludge drying device.

Background

There are roughly four ways in which liquid can be present in the sludge, with interstitial water (free water) accounting for about 70% of the total moisture, capillary water accounting for about 20% of the total moisture, and adsorbed water on the particle surfaces and internal water accounting for about 10%. Sludge dewatering or drying has generally undergone four generations of technological development: (1) naturally drying; (2) mechanical drying; (3) drying the high molecular material; (4) the drying of the nano material and the compounding degree of the technology are continuously increased.

The mechanical drying realizes solid-liquid separation by mechanical kinetic energy or heat energy, and mainly comprises a spiral-stacked dehydrator, a belt filter press, a plate-frame filter press, a centrifugal dehydrator, a rotary kiln dryer and the like. The water content of the treated sludge is over 20 percent. The spiral-stacked dehydrator, the belt filter press, the plate-and-frame filter press and the centrifugal dehydrator have the defects of high water content of treated mud cakes, high equipment noise, small single machine treatment capacity, high energy consumption, large equipment floor area, difficult maintenance, limited application field range and the like. Although the rotary kiln dryer can treat mud cakes with low moisture content, the treatment cost is high, the tail gas emission pollution is serious, and the investment cost is high. The technology of the super-absorbent material is started in 1938, and the research of China is started in the last 80 th century; at present, the main materials comprise polyacrylic acids, starch grafted acrylic acids, polyacrylonitrile hydrolysates, starch grafted polyacrylonitrile hydrolysates, celluloses and polyvinyl alcohols. Among them, water-soluble high molecular polymers such as Polyacrylamide (PAM) are used as flocculants to remove water adsorbed on the particle surface, but face secondary pollution. The water absorption capacity of the super-absorbent polymer resin (SAP) can reach 500-2000 times of the self weight, but the super-absorbent polymer resin cannot be biodegraded and has biotoxicity; the graphene oxide is introduced into a polymer network of acrylic resin, so that the water absorption and retention effects of the material are further improved, but the material is not easy to extrude and dehydrate quickly after absorbing water. Application date 2018.01.22, published (announced) date 2018.07.13 discloses that "an alkali residue-based sludge curing agent added with super absorbent resin" is prepared by mixing a mixed powder material of alkali residue, phosphogypsum, carbide slag and metakaolin with steel slag powder with a particle size of less than 6 μm, adding SAP, water glass and polyacrylamide to form the alkali residue-based sludge curing agent of super absorbent resin, and after mixing, the water content of sludge can be reduced to below 5%, but the material can not be reused.

Super-strong liquid-absorbing material based on nano technology and various separation membrane technical researches begin in the middle of the 80 th century of the last century and develop rapidly after the 90 th century. For example, the Oasis super absorbent fiber and the Indian science and technology institute develop a novel water-absorbent healthy and environment-friendly material which is prepared from micro nano-fiber, is degradable and has little influence on the environment. However, these materials are currently not used for sludge treatment in any substantial way due to the technical threshold and the high cost.

Generally, as the solid-liquid phase components of the sludge are very complex, the technology is rapidly developed and continuously deepened since the last 80 years, but the treatment efficiency is not high, the secondary pollution is obvious, and the cost is not substantially reduced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a sludge drying apparatus, which aims to reduce the liquid content of the dried sludge.

Specifically, the method is realized through the following technical scheme:

a sludge drying apparatus, characterized by comprising:

the mixing device is used for mixing the liquid absorption particles with sludge slurry to be dried to obtain a mixture, and liquid of the sludge slurry to be dried in the mixture is absorbed by the liquid absorption particles; and

an extrusion device for extruding the mixture, the liquid-absorbent particles being compressed and discharging liquid.

Optionally, mixing arrangement is including spraying mechanism and feeding mechanism, feeding mechanism is used for carrying the imbibition granule, it is used for the blowout to spray the mechanism treat the spraying liquid of mummification mud thick liquid.

Optionally, the spraying mechanism includes the shower head and has the chamber that sprays of rectangular shape oral area, through the shower head spun treat that mummification mud thick liquid sprays the liquid via the rectangular shape oral area blowout in chamber sprays.

Optionally, the liquid outlet of the spray header is located inside the spray cavity.

Optionally, the spraying mechanism is arranged above the feeding mechanism, the feeding mechanism comprises an inclined plane, the liquid absorption particles roll off along the inclined plane, and the spraying liquid is sprayed on the inclined plane.

Optionally, the squeezing device includes a squeezing mechanism and a squeezing chamber, the squeezing chamber is used for containing the mixture to be squeezed, the mixture is squeezed in the squeezing chamber, the bottom of the squeezing chamber is a screen, and the squeezed liquid is filtered and discharged through the screen.

Optionally, the pressing mechanism includes a base, a pressing plate, and a power source and a deformable connecting member for connecting the base to the pressing plate, the base is fixedly disposed, the power source drives the pressing plate to move relative to the base to generate a movement stroke for pressing the mixture, and the deformable connecting member generates deformation that does not interfere with the movement of the pressing plate during the movement stroke of the pressing plate.

Optionally, the pressing mechanism further includes a guide portion, and the power source drives the pressing plate to move along the guide portion to generate the moving stroke.

Optionally, the apparatus further comprises a conveying device for conveying the mixture to the extrusion chamber,

the conveying device comprises a bottom conveying belt and two side conveying belts, the two side conveying belts are arranged on two opposite sides of the bottom conveying belt, the bottom conveying belt encircles the bottom wall of the extrusion cavity in a reciprocating mode, the two side conveying belts respectively encircle the side wall of the extrusion cavity in a reciprocating mode, and the bottom conveying belt is a conveying belt of a screen structure.

Optionally, the apparatus further comprises a separation device, the mixture is extruded by the extrusion device to form a dried mixture, and the separation device is used for separating the liquid absorption particles in the dried mixture and the solid-phase sludge particles attached to the liquid absorption particles.

Optionally, the separation device includes separation vessel, vibration portion and/or stirring portion, separation vessel is used for holding the mummification mixture, vibration portion is used for driving the separation vessel vibration, stirring portion is used for stirring in the separation vessel mummification mixture.

Optionally, the bottom of the separation vessel comprises perforations for leaking separated sludge during vibration and/or agitation.

Optionally, stirring portion includes pivot and puddler, the pivot rotates the setting, the puddler along the heliciform distribution in the outer wall of pivot.

Optionally, the apparatus further includes a material guiding device, the material guiding device is configured to guide the dried mixture into the separating device, the material guiding device includes a material guiding shaft and a spiral material guiding plate disposed around the material guiding shaft, and the material guiding shaft is rotatably disposed.

The technical scheme provided by the application can achieve the following beneficial effects:

the application provides a sludge drying equipment, this equipment are used for carrying out the mummification to mud and handle, including mixing arrangement and extrusion device, wherein, mixing arrangement is used for mixing imbibition granule and treats mummification mud thick liquid for the liquid of treating mummification mud thick liquid in the mixture is adsorbed by the adsorption particle, and extrusion device is used for the extrusion mixture, and the imbibition granule is compressed under the effect of extrusion force and is gone out the liquid. The device realizes the drying of sludge slurry to be dried, and the dried sludge has low liquid content.

Drawings

FIG. 1 is a flow diagram of a sludge drying process shown herein;

FIG. 2 is yet another flow diagram of a sludge drying process shown herein;

FIG. 3 is yet another flow diagram of a sludge drying process shown herein;

FIG. 4 is a schematic view of a sludge drying apparatus according to an exemplary embodiment of the present application;

FIG. 5 is a schematic diagram of a partial structure of a spray mechanism shown in an exemplary embodiment of the present application;

FIG. 6 is a schematic view of a pressing mechanism shown in an exemplary embodiment of the present application;

FIG. 7 is a schematic illustration of a partial structure of a delivery device shown in an exemplary embodiment of the present application;

FIG. 8 is a cross-sectional view of a stirring section shown in an exemplary embodiment of the present application;

FIG. 9 is yet another flow diagram of a sludge drying process shown in the present application;

FIG. 10 is a further flow diagram of a sludge drying process illustrated herein.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and claims of this application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise specified, "front", "back", "lower" and/or "upper", "top", "bottom", and the like are for ease of description only and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Referring to fig. 1, fig. 1 shows a flow chart of a sludge drying method according to an exemplary embodiment of the present disclosure.

The application provides a sludge drying method (hereinafter referred to as method for short), which comprises the following steps:

step S10, mixing the liquid absorption particles with sludge slurry to be dried to obtain a mixture, wherein the liquid of the sludge slurry to be dried in the mixture is absorbed by the liquid absorption particles;

step S20, the mixture is squeezed, and the liquid-absorbing particles are compressed and discharge liquid.

In the method, firstly, liquid-absorbing particles are mixed with sludge slurry to be dried, and the liquid-absorbing particles are made of water-absorbing materials and have water-absorbing characteristics. Also, the liquid-absorbent particles have a large specific surface area. Therefore, the liquid absorbing particles can absorb the liquid in the sludge slurry to be dried by utilizing the larger specific surface area and the capillary phenomenon of the liquid absorbing particles. The liquid absorption particles and the sludge slurry to be dried are mixed according to a proper proportion, and the mixture is a granular mixture. Next, the mixture is pressed, and the liquid-absorbent particles are compressed and discharged out of the liquid under the effect of the pressing force. In the sludge drying method provided by the application, a part of liquid in the mixture is absorbed by the liquid absorption particles and then is retained in the liquid absorption particles, and a part of liquid can be discharged through extrusion force. Because the mixture is a granular mixture, the granules in the mixture are relatively dispersed, and gaps are reserved among the granules, so that the granules in the mixture can drain liquid to the periphery by utilizing the larger specific surface area of the granules under the action of the extrusion force, so that the liquid can be discharged from the granules in the mixture, the liquid drainage area is increased, and the liquid drainage quantity is increased. The scheme optimizes the integral liquid drainage in the traditional sludge drying technology into distributed liquid drainage, so that the liquid content of the dried sludge is obviously reduced, and the deep drying of the sludge is realized.

Referring to fig. 2, fig. 2 shows another flow chart of a sludge drying method according to an exemplary embodiment of the present disclosure.

The method may further comprise: and step S30, releasing the extrusion of the mixture, wherein the liquid absorption particles have elasticity, and the liquid absorption particles reabsorb the residual liquid in the mixture in the recovery process to obtain a dried mixture.

This step S30 is performed after step S20, and in step S20, when the mixture is pressed, the liquid-absorbing particles are compressed, and the liquid in the pores is discharged, the pore throats of the liquid-absorbing particles clogged by the solid-phase sludge particles in the mixing step are back-flushed. Next, in step S30, when the pressing of the mixture is released, the liquid-absorbent particles having elasticity are restored, and the liquid-absorbent particles can absorb the residual liquid in the mixture while restoring (restoring the pores). In the adsorption process, negative pressure is generated inside the adsorption particles due to restoration, so that stronger adsorption force can be generated on liquid in sludge slurry to be dried in the restoration process by the adsorption particles, more residual liquid can be sucked into the adsorption particles from the mixture again under the dual conditions that the adsorption particles have unobstructed pores and stronger adsorption force, solid and liquid phases in the mixture are further separated, a dried mixture is obtained, and the purpose of further drying the sludge is achieved.

The term "recovery" as used above includes both the meaning that the liquid-absorbent particles are completely recovered after the squeezing is released and the shape after recovery substantially matches the shape before squeezing; secondly, the liquid absorption particles are not completely recovered after the extrusion is released, and the recovery degree is more than 50%.

In an alternative example, the liquid-absorbent particles include an elastomeric matrix and an additive, which may include at least one of: graphene, polyurethane, carbon nanotubes, activated carbon, cellulose, nano-ceramics, nano-powder, starch, ethylene, acetic acid, vinyl ester, azodicarbonamide and dicumyl peroxide. The additive is nontoxic, harmless and degradable.

The shape and size of the liquid absorption particles can be selected according to the specific components of the sludge, for example, the liquid absorption particles can be particles with the diameter of 5 mm-200 mm. The sludge is of various types, such as municipal sludge, municipal domestic waste sludge, industrial solid waste sludge, and the like.

In step S10, the liquid-absorbing particles may be dispersedly mixed in the sludge slurry to be dried, and the mixing ratio of the liquid-absorbing particles to the sludge slurry to be dried is: the volume of the liquid-absorbing particles is more than twice of the volume of the sludge slurry to be dried.

According to different types of sludge to be dried, the mixing proportion of the liquid absorbing particles and the sludge slurry to be dried is different, and two times, three times or more times can be selected. Under the appropriate mixing proportion, the mixture of the sludge slurry to be dried and the liquid absorption particles can be finally formed into a granular mixture, and the particles in the granular mixture are subjected to extrusion force in a mutually dispersed state, so that good liquid drainage and pore cleaning can be realized in the extrusion process.

In step S10, the sludge slurry to be dried may be obtained by mixing the sludge raw material and the diluent in a ratio, and the liquid content of the sludge slurry to be dried obtained by mixing is 85% or more. As used herein, "sludge material" refers to naturally occurring and untreated sludge. In this step, the diluent is mixed with the sludge raw material, so that the liquid content of the sludge raw material can be increased, and the interstitial water in the sludge raw material can be increased. When the sludge slurry to be dried is mixed with the liquid absorption particles, the sludge slurry to be dried with higher liquid content can make full use of the specific surface area and the capillary phenomenon of the liquid absorption particles, so that the liquid in the sludge slurry to be dried can be more easily absorbed.

In an alternative example, the diluent may include at least one of: fresh water, seawater, or recycled slurry.

In step S10, when the liquid-absorbing particles are mixed with the sludge slurry to be dried in proportion, for example, an appropriate amount of the liquid-absorbing particles may be put into the sludge slurry to be dried at a time, and the two may be mixed together by stirring.

In this example, the liquid-absorbent particles are mixed with the sludge slurry to be dried in a different manner. Specifically, mixing the liquid-absorbing particles with sludge slurry to be dried comprises: the liquid absorption particles are output according to a first preset flow, the sludge slurry to be dried is sprayed out in a spraying mode according to a second preset flow, and the liquid absorption particles and the spraying liquid of the sludge slurry to be dried are gradually mixed in the conveying process.

This step allows the liquid-absorbent particles to be gradually mixed with the spray of sludge slurry to be dried, partly in batches. And the sludge slurry to be dried is sprayed in a spraying mode, so that the sludge slurry to be dried is prevented from being excessively concentrated when being output, and the spraying liquid and the liquid absorption particles are more fully mixed.

In an alternative example, the second predetermined streamThe amount was 2.5m³/h～30m³And h, the first preset flow is more than twice of the second preset flow. In a specific example, the second preset flow rate is 25m³H, the first preset flow is 50m³More than h. Therefore, the spray liquid of the sludge slurry to be dried is adsorbed by more liquid-absorbing particles, and the treatment capacity of the sludge slurry to be dried in the drying treatment process is increased.

Further, in the process of gradually participating in the mixing, the liquid-absorbing particles may roll down along the inclined surface, and the spray liquid is sprayed on the inclined surface. Therefore, in the process of falling of the liquid absorption particles, the liquid absorption particles are always in a moving state, so that the liquid absorption particles can change postures continuously, the surfaces of the liquid absorption particles have more chances to contact with the spraying liquid, and more spraying liquid is adsorbed.

Furthermore, the spraying liquid can be sprayed out through a spraying mechanism with a strip-shaped opening part, so that the spraying liquid forms waterfall-shaped spraying liquid. In the step, the spraying mechanism with the strip-shaped opening part can increase the output width of the spraying liquid, so that the spraying liquid is more dispersed when sprayed out and is not concentrated in a certain area, and more liquid absorbing particles can be fully contacted with the spraying liquid. In another aspect, the liquid-absorbent particles may be distributed to increase the distance between the liquid-absorbent particles, thereby making it possible to increase the specific surface area of the liquid-absorbent particles.

In addition, the inclined surface may be provided with a leak hole through which the spray liquid not adsorbed to the liquid-absorbing particles can be discharged without proceeding to step S20, whereby the mixture can be ensured to be a granular mixture.

In a specific example, the inclined surface may be provided in a screen structure, for example, a screen of 200-400 meshes may be selected, the liquid-absorbing particles roll down along the screen, and the spray liquid is sprayed onto the screen, so that the spray liquid that is not adsorbed to the liquid-absorbing particles can be recovered through the screen.

The mixture in the form of pellets is normally in a stacked state, and in step S20, when the mixture is extruded, the extrusion direction coincides with the stacking direction. For example, a granular mixture may be charged into an extrusion chamber of a box structure, the mixture stacked to a predetermined height in the extrusion chamber, and the mixture may be extruded in a height direction. After the mixture piles up, be equivalent to a plurality of imbibition particles layering and arrange, in extrusion process, the imbibition particle of lower floor can be flowed through to the liquid that discharges in the imbibition particle of upper strata, and then the imbibition particle of lower floor can play the effect of filtering liquid, reduces the solid phase mud granule in the discharged liquid.

When the mixture is extruded, the extrusion time of the mixture can be set to be 5s to 30s, and the pressure can be set to be 5Pa to 50 Pa. In one specific example, the pressing time may be set at 25s and the pressure at 40 Pa. This setting can ensure that imbibition granule can be abundant receive the extrusion to there is sufficient time outflow from imbibition granule exhaust liquid, improve the mummification efficiency of mud and practice thrift the mummification time of mud.

Referring to fig. 3, fig. 3 shows a further flow chart of a sludge drying method according to an exemplary embodiment of the present application.

The method further comprises the following steps: step S40, separating the liquid absorbing particles in the drying mixture from the solid-phase sludge particles attached to the liquid absorbing particles.

The step can strip solid-phase sludge particles from the liquid absorption particles, on one hand, the sludge is favorably treated in a centralized way, on the other hand, the liquid absorption particles can be continuously and repeatedly utilized in the next working cycle, and the cost is saved.

In step S40, the separating the liquid-absorbent particles from the solid-phase sludge particles attached to the liquid-absorbent particles in the drying mixture includes: vibrating and/or stirring the dried mixture. The purpose of vibrating and stirring the drying mixture is to increase the kinetic energy of the drying mixture, so that the drying mixture collides with each other or with other objects, and solid sludge particles are separated from the liquid-absorbing particles. In this step, the dried mixture may be vibrated and stirred simultaneously.

Further, in the separation process, sludge separated from the liquid absorption particles can leak from a sludge port, and the liquid absorption particles automatically enter the next working cycle under vibration and stirring. The step realizes the automatic shunting of the solid-phase sludge particles and the liquid absorption particles, does not need manual screening, and ensures the continuity and high efficiency of the sludge drying process.

In one example, the dried mixture can be vibrated by a vibration pump, and the dried mixture can be stirred by a stirrer, wherein the vibration frequency of the vibration pump is 1Hz-60Hz, and the rotation speed of the stirrer is 6rpm-120 rpm. In a specific example, the vibration frequency of the vibration pump may be selected to be 30Hz, and the rotation speed of the agitator may be set to be 50 rpm.

Referring to fig. 4, fig. 4 is a schematic diagram of a sludge drying apparatus according to an exemplary embodiment of the present disclosure.

The application also provides a sludge drying device 10 (hereinafter referred to as device), and the device 10 comprises a mixing device 11 and a squeezing device 12. The mixing device 11 is used for mixing the liquid absorption particles with sludge slurry to be dried to obtain a mixture, and liquid of the sludge slurry to be dried in the mixture is absorbed by the liquid absorption particles. The liquid-absorbing particles are made of a water-absorbing material and have water-absorbing properties. Also, the liquid-absorbent particles have a large specific surface area. Therefore, the liquid absorbing particles can absorb the liquid in the sludge slurry to be dried by utilizing the larger specific surface area and the capillary phenomenon of the liquid absorbing particles. The liquid absorption particles and the sludge slurry to be dried are mixed according to a proper proportion, and the mixture is a granular mixture.

The pressing device 12 is used to press the mixture so that the liquid-absorbing particles in the mixture are forced out of the liquid by the pressing force. Under the pressing force of the pressing means 12, the liquid-absorbing particles are compressed and discharge liquid. It follows that a part of the liquid in the mixture is retained in the liquid-absorbent particles by adsorption of the liquid-absorbent particles, and a part of the liquid can be discharged by the squeezing means 12. Because the mixture is a granular mixture, the granules in the mixture are relatively dispersed, and gaps are reserved among the granules, so that the granules in the mixture can drain liquid to the periphery by utilizing the larger specific surface area of the granules under the action of the extrusion force, so that the liquid can be discharged from the granules in the mixture, the liquid drainage area is increased, and the liquid drainage quantity is increased. The scheme optimizes the integral liquid drainage in the traditional sludge drying technology into distributed liquid drainage, so that the liquid content of the dried sludge is obviously reduced, and the deep drying of the sludge is realized.

In one example, the mixing device 11 includes a spraying mechanism 110 and a feeding mechanism 112, and the sludge slurry to be dried is sprayed out through the spraying mechanism 110 to form a spraying liquid. The wicking particles are transported by a feed mechanism 112. The liquid absorbing particles are conveyed out to be mixed with the spraying liquid to form a mixture.

Specifically, the liquid-absorbing particles are conveyed out through the feeding mechanism 112 according to a first preset flow rate, and the sludge slurry to be dried is sprayed out through the spraying mechanism 110 according to a second preset flow rate to form a spraying liquid. In the process of transporting the liquid absorbing particles and spraying the spray liquid, the liquid absorbing particles and the spray liquid are partially and partially mixed in batches. In this scheme, the spraying mechanism 110 and the feeding mechanism 112 enable the sludge slurry to be dried and the liquid-absorbing particles to be gradually mixed according to a preset flow rate, so that compared with a mode of mixing all the liquid-absorbing particles and the sludge slurry to be dried together, the method can ensure the continuity and the high efficiency of the sludge drying treatment process. In an alternative example, the second predetermined flow rate is 2.5m³/h～30m³And h, the first preset flow is more than twice of the second preset flow. In a specific example, the second preset flow rate is 25m³H, the first preset flow is 50m³More than h. Therefore, the spray liquid of the sludge slurry to be dried is adsorbed by more liquid-absorbing particles, and the treatment capacity of the sludge slurry to be dried in the drying treatment process is increased.

In the example shown in fig. 4, both the spraying mechanism 110 and the feeding mechanism 112 are higher than the ground by a preset distance, and the sludge slurry to be dried is sucked into the spraying mechanism 110 by the pump 114 and then is sprayed out. The spraying mechanism 110 is disposed above the feeding mechanism 112, and the feeding mechanism 112 includes an inclined surface 112a, and the plurality of liquid-absorbing particles can roll down along the inclined surface 112a of the feeding mechanism 112. In the mixing process, the spray liquid sprayed from the spray mechanism 110 is sprayed onto the inclined surface 112a of the feeding mechanism 112, the plurality of liquid-absorbing particles are mixed with the spray liquid in the process of rolling off, and the mixed mixture falls into the mixing container 116 disposed below the spray mechanism 110 and the feeding mechanism 112 along the inclined surface 112 a. Above-mentioned structure can make the imbibition granule constantly roll at the in-process with treating mummification mud thick liquids mixture for the surface of imbibition granule can be more fully with spraying the liquid contact at the in-process that rolls down, with adsorb more treat mummification mud thick liquids.

The inclined surface 112a may be provided with leakage holes through which the shower liquid not adsorbed by the liquid-absorbing particles can be discharged. In an alternative example. The inclined surface 112a is provided with a filter screen structure, a filter screen with 200 meshes to 400 meshes can be selected, the liquid absorbing particles roll down along the filter screen, and the spray liquid which is not absorbed by the liquid absorbing particles can be leaked from the filter screen and recovered.

The opening area of the mixing container 116 is larger than the area of other portions, whereby the spray liquid and the liquid absorbing particles can be prevented from falling to the outside of the mixing container 116. Specifically, one side wall of the mixing container 116 is an inclined wall 116a, which is inclined toward the side away from the spraying mechanism 110, so that the opening area of the mixing container 116 is increased. When the liquid suction particles collide with the inclined wall 116a during the falling, the inclined wall 116a can rebound the liquid suction particles into the mixing container 116 against the force of the liquid suction particles, and the inclined wall 116a functions as a blocking wall.

In a specific example, referring to fig. 5, the spraying mechanism 110 includes a spraying head 110a and a spraying cavity 110b having an elongated opening, the sludge slurry to be dried is sprayed out from the spraying head 110a, the spraying cavity 110b is used for accommodating the spraying liquid sprayed out from the spraying head 110a, and when the spraying cavity 110b is filled with the spraying liquid, the sludge slurry to be dried in the spraying cavity 110b is sprayed out along the elongated opening 110 ba. This scheme can make the sludge slurry that treats mummification disperse along the rectangular shape oral area 110ba of spraying chamber 110b for the sludge slurry that treats mummification is sprayed more evenly. Accordingly, the feed port of the feed mechanism 112 may also extend along the elongated mouth portion 110ba so that the liquid-absorbing particles are mixed with the shower liquid in a state of being dispersed with each other.

As can be easily understood, the spraying liquid is easy to splash when being sprayed into the spraying cavity 110b, which causes environmental pollution, and therefore, the liquid outlet 110aa of the spray header 110a is disposed inside the spraying cavity 110b in the present application. When the liquid level of the sludge slurry to be dried in the spray cavity 110b is higher than the liquid outlet 110aa of the spray head 110a, the liquid sprayed from the spray head 110a is subjected to the resistance of the liquid in the spray cavity 110b, so that the splashing phenomenon is reduced or even avoided.

In the example shown in fig. 5, the shower head 110a is provided in plurality, and the plurality of shower heads 110a are uniformly arranged along the length direction of the shower chamber 110 b.

With continued reference to fig. 4, the extrusion apparatus 12 includes an extrusion mechanism 120 and an extrusion chamber 122, the extrusion chamber 122 is used for containing the mixture to be extruded, and the extrusion chamber 122 may be configured as a rectangular parallelepiped structure. The bottom wall of the extrusion chamber 122 is provided as a screen through which the discharged liquid after the mixture is extruded can leak out. As will be readily appreciated, the screen may quickly leak the expressed liquid out. The mesh number of the screen can be set selectively according to the size of the liquid-absorbing particles.

The extrusion time of the mixture extruded by the extrusion device 12 is 5 s-30 s, and the pressure intensity is 5 Pa-50 Pa. In one specific example, the pressing time may be set at 25s and the pressure at 40 Pa. This setting can ensure that imbibition granule can be abundant receive the extrusion of extrusion device 12 for there is sufficient time outflow from imbibition granule exhaust liquid, improves the mummification efficiency of mud and practices thrift the mummification time of mud.

When the mixture is squeezed, the liquid-absorbent particles are compressed and the liquid in the pores is discharged, and the pore throats that have been clogged by solid-phase sludge particles in the mixing step are back-flushed. When the pressing means 12 releases the pressing of the mixture, the liquid-absorbent particles having elasticity are restored, and the liquid-absorbent particles reabsorb the residual liquid in the mixture while restoring the pores. This absorption process because there is the negative pressure in the recovery of imbibition granule, consequently, the imbibition granule of recovering after being extrudeed by extrusion device 12 this moment can treat mummification sludge slurry and produce stronger adsorption affinity, has unobstructed hole and stronger adsorption affinity's dual condition after the imbibition granule extrusion under, more residual liquid in this imbibition granule can the suction mixture, further separates the solid-liquid in the mixture, obtains the mummification mixture to reach the purpose of further mummification mud.

Referring to fig. 6, in an alternative example, the pressing mechanism 120 includes a base 120a, a pressing plate 120b, and a power source 120c connecting the base 120a and the pressing plate 120 b. The base 120a may be fixed, and the pressing plate 120b is movably disposed relative to the base 120a under the driving of the power source 120c, so as to generate a moving stroke for extruding the mixture. In this example, the power source 120c is a hydraulic cylinder, a cylinder body of the hydraulic cylinder is hinged to the base 120a, a piston rod is hinged to the pressing plate 120b, the piston rod extends out and retracts under the action of hydraulic oil, so as to drive the pressing plate 120b to descend and ascend, and the pressing plate 120b can extrude the mixture in a descending stroke. The hydraulic cylinders may be provided in plurality and arranged along the length of the pressing plate 120b to ensure that the mixture is uniformly compressed during the extrusion process.

The pressing mechanism 120 further includes a deformable connecting member 120d, the deformable connecting member 120d is configured as a deformable structure, two ends of the deformable connecting member 120d are respectively hinged to the base 120a and the pressing plate 120b, and the deformable connecting member 120d can play a role in strengthening the connection between the base 120a and the pressing plate 120 b.

In this example, the deformable coupling member 120d includes a first connecting rod 120da and a second connecting rod 120db, and the first connecting rod 120da is hingedly coupled to the second connecting rod 120 db. In the stroke in which the pressing plate 120b moves relative to the base 120a, the first link rod 120da and the second link rod 120db rotate relative to each other, and a deformation corresponding to the movement of the pressing plate 120b is generated, that is, no interference is caused with the movement of the pressing plate 120 b. It should be understood that the embodiment of the deformable coupling member 120d is not limited thereto.

Further, the extruding mechanism 120 may further include a guide portion (not shown), and the pressing plate 120b may move along the guide portion under the driving of the power source 120c, so as to generate a moving stroke for extruding the mixture. The guide portion may be a slide rail provided in a vertical direction along which the pressing plate 120b ascends and descends.

Referring to fig. 4 and 7, the apparatus 10 further comprises a delivery device 13, the delivery device 13 being adapted to deliver the mixture to the extrusion device 12, more precisely to the extrusion chamber 122.

In one example, the conveyor 13 includes a bottom conveyor belt 130 and two side conveyor belts 132, and the two side conveyor belts 132 are respectively disposed on two opposite sides of the bottom conveyor belt 130. The mixture is fed into the extrusion chamber 122 by the conveying forces of the bottom conveyor belt 130 and the two side conveyor belts 132.

In this example, the extrusion chamber 122 is configured as a rectangular box structure with an open top, and the bottom conveyor belt 130 and the two side conveyor belts 132 are respectively disposed in the extrusion chamber 122, wherein the bottom conveyor belt 130 is reciprocally conveyed along a bottom wall of the extrusion chamber 122, and the two side conveyor belts 132 are reciprocally conveyed along two side walls of the extrusion chamber 122. To achieve the discharge of the free liquid, the bottom conveyor 130 is configured as a screen-structured conveyor.

As can be seen from the above description, the conveying device 13 reciprocates in the extrusion chamber 122, and during the extrusion process, the conveying device 13 stops conveying. The mixture is conveyed without interference. This arrangement allows the apparatus 10 to be reduced in size and more compact.

Referring to fig. 4 again, the mixing container 116 is disposed on the feeding side of the conveying device 13, a discharge port is disposed at the bottom of the mixing container 116, the discharge port is communicated with the extrusion chamber 122, and the mixture entering the mixing container 116 may fall into the bottom conveying belt 130 through the discharge port and then be input into the extrusion chamber 122, so that the continuity and the high efficiency of the sludge drying process are achieved.

The apparatus 10 further comprises a separation device 14 and a material guiding device 15, wherein the separation device 14 is used for separating liquid absorbing particles in the drying mixture and solid phase sludge particles attached to the liquid absorbing particles. The dried mixture is obtained by extruding the mixture through an extruding device 12. The material guide 15 is used to guide the dried mixture to the separation device 14.

In one example, the separation device 14 includes a separation container 140, a vibration portion 142, and a stirring portion 144, wherein the separation container 140 is used for containing the dried mixture, the vibration portion 142 is used for driving the separation container 140 to vibrate, and the stirring portion 144 is used for stirring the dried mixture in the separation container 140. In summary, the vibrating portion 142 and the stirring portion 144 can provide kinetic energy to the drying mixture in the separation container 140, so that the drying mixture collides with each other or the drying mixture collides with the separation container 140, so that the sludge solid phase particles and the liquid absorbing particles are separated from each other. The liquid absorption particles separated from the sludge can be recycled.

In one example, the vibration unit 142 includes a vibration pump, and the vibration of the vibration pump drives the separation container 140 to vibrate, so that the drying mixture in the separation container 140 is vibrated. The vibration frequency of the vibration pump is 1Hz-60Hz, and in a specific example, the vibration frequency of the vibration pump can be 30 Hz.

Referring to fig. 8, the stirring portion 144 may include a rotating shaft 144a and a stirring rod 144b, wherein the rotating shaft 144a is rotatably disposed, and the stirring rod 144b is spirally distributed on an outer wall of the rotating shaft 144 a. In the process of rotating the rotating shaft 144a, the stirring rod 144b stirs the drying mixture in the separation container 140 to roll, so as to realize the separation of the sludge solid phase particles and the liquid absorption particles. The rotating shaft 144a rotates at 6rpm to 120rpm, and in a specific example, the rotating shaft 144a rotates at 50 rpm.

Further, to avoid the agitation bar 144b from damaging the wicking particles during dialing, the agitation bar 144b may be made of a flexible material, such as rubber. In addition, the bottom plate of the separation container 140 can be provided with holes, so that solid-phase sludge particles falling off from the liquid absorption particles can be leaked out through the holes in the vibration process and collected in the sludge collection container, and the automatic shunting of sludge and the liquid absorption particles is realized.

In this example, the separation container 140 is connected to the feeding mechanism 112, the liquid-absorbing particles separated from the solid-phase sludge particles can roll toward the side of the feeding mechanism 112 by shifting the stirring rod 144b, and when the liquid-absorbing particles roll into the feeding mechanism 112, the liquid-absorbing particles continue to be mixed with the spraying liquid along the inclined surface 112a of the feeding mechanism 112, so as to perform the next working cycle, thereby realizing the automation and continuity of the sludge treatment process.

It will be readily appreciated that in the above-described arrangement, the agitator section 144 serves not only as part of the separating apparatus 14, but also as part of the feed mechanism 112. When the rotating shaft of the stirring section 144 rotates, the stirring rods 144b distributed along the spiral curve can push the separated liquid-absorbing particles from the separation container 140 to the feeding mechanism 112, and then roll down along the inclined surface 112a of the feeding mechanism 112. Wherein the pitch between the helically arranged stirring rods 144b and the rotational speed of the rotating shaft 144a are such that the liquid-absorbent particles are transported out at a first predetermined flow rate.

The separating device 14 and the extrusion chamber 122 are arranged along the height direction, and the material guiding device 15 is arranged between the extrusion chamber 122 and the separating device 14 and is respectively connected with the extrusion chamber 122 and the separating device 14 vertically. This arrangement allows the apparatus 10 to make full use of the height-wise space 10, saving floor space in a planar space.

In one example, as shown in fig. 4, the material guiding device 15 includes a material guiding shaft 150 and a spiral material guiding plate 152 spirally wound around the material guiding shaft 150, wherein the material guiding shaft 150 is rotatably disposed. During the rotation of the guide shaft 150, the spiral guide plate 152 can lift the dried mixture to a predetermined level and feed the dried mixture to the separation device 14.

Referring to fig. 9, the present application further provides a sludge drying method, including the following steps:

the method comprises the following steps: preparing slurry, namely mixing the sludge raw material with diluent to obtain sludge slurry to be dried;

step two: mixing, namely mixing the sludge slurry to be dried with liquid absorption particles to obtain a mixture, wherein the liquid of the sludge slurry to be dried in the mixture is absorbed by the liquid absorption particles;

step three: first drying, squeezing the mixture, compressing the liquid-absorbing particles and discharging liquid; and

step four: and (3) drying for the second time, relieving the extrusion on the mixture, wherein the liquid absorption particles have elasticity, and the liquid absorption particles reabsorb residual liquid in the mixture in the recovery process to obtain a dried mixture.

In the first step, the sweat rate of the sludge slurry to be dried formed by mixing the sludge raw material and the diluent is more than 85%. By mixing the diluent with the sludge raw material, the liquid content of the sludge raw material can be improved, and the interstitial water in the sludge raw material can be increased. When the sludge slurry to be dried is mixed with the liquid absorption particles, the sludge slurry to be dried with higher liquid content can make full use of the specific surface area and the capillary phenomenon of the liquid absorption particles, so that the liquid in the sludge slurry to be dried can be more easily absorbed. The diluent may include at least one of: fresh water, seawater, or recycled slurry.

In the second step, the liquid-absorbing particles can be dispersedly mixed in the sludge slurry to be dried, and the volume of the liquid-absorbing particles is more than twice of the volume of the sludge slurry to be dried.

In the concrete mixing step, the liquid absorption particles are output according to a first preset flow, the sludge slurry to be dried is sprayed out in a spraying mode according to a second preset flow, and the liquid absorption particles and the spraying liquid of the sludge slurry to be dried are gradually mixed in the conveying process. The second preset flow rate is 2.5m³/h～30m³More than h, the first preset flow is more than twice of the second preset flow. In a specific example, the second preset flow rate is 25m³More than h, the first preset flow is 50m³More than h. Therefore, the spray liquid of the sludge slurry to be dried is adsorbed by more liquid-absorbing particles, and the treatment capacity of the sludge slurry to be dried in the drying treatment process is increased.

In the third step, when the mixture is extruded, the extrusion time of the mixture can be set to be 5 s-30 s, and the pressure is set to be 5 Pa-50 Pa. In one specific example, the pressing time may be set at 25s and the pressure at 40 Pa. This setting can ensure that imbibition granule can be abundant receive the extrusion to there is sufficient time outflow from imbibition granule exhaust liquid, improve the mummification efficiency of mud and practice thrift the mummification time of mud.

In the fourth step, when the pressing of the mixture is released, the liquid-absorbent particles having elasticity are restored, and the liquid-absorbent particles restore the pores and simultaneously, the residual liquid in the mixture is absorbed. In the adsorption process, the liquid absorption particles are restored to generate negative pressure inside, so that the liquid absorption particles can generate stronger adsorption force on sludge slurry to be dried in the restoration process, and under the dual conditions of unobstructed pores and stronger adsorption force after the liquid absorption particles are extruded, the liquid absorption particles can absorb more residual liquid from the mixture after the extrusion is removed, so that solid and liquid phases in the mixture are further separated to obtain a dried mixture, and the purpose of further drying the sludge is achieved.

Referring to fig. 10, the method further includes:

step five: and separating the liquid absorption particles and the solid-phase sludge particles attached to the liquid absorption particles in the drying mixture.

In the fifth step, the liquid-absorbing particles in the drying mixture and the solid-phase sludge particles attached to the liquid-absorbing particles can be separated by means of vibration and stirring.

The mixture can be dried by vibration of a vibration pump, and the dried mixture is stirred by a stirrer, wherein the vibration frequency of the vibration pump is 1Hz-60Hz, and the rotating speed of the stirrer is 6rpm-120 rpm. In a specific example, the vibration frequency of the vibration pump may be selected to be 30Hz, and the rotation speed of the agitator may be set to be 50 rpm.

In the separation process, the sludge separated from the liquid absorption particles can leak from the sludge port, and the liquid absorption particles automatically enter the next working cycle under the vibration and the stirring. The step realizes the automatic shunting of the solid-phase sludge particles and the liquid absorption particles, does not need manual screening, and ensures the continuity and high efficiency of the sludge drying process. And meanwhile, the repeated utilization of the liquid absorption particles is realized.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sludge drying apparatus, characterized by comprising:

the mixing device (11) is used for mixing the liquid absorption particles with sludge slurry to be dried to obtain a mixture, and liquid of the sludge slurry to be dried in the mixture is absorbed by the liquid absorption particles; and

an extrusion device (12) for extruding the mixture, the liquid-absorbent particles being compressed and discharging liquid.

2. The sludge drying apparatus according to claim 1, wherein the mixing device (11) comprises a spraying mechanism (110) and a feeding mechanism (112), the feeding mechanism (112) is used for conveying the liquid-absorbing particles, and the spraying mechanism (110) is used for spraying the spraying liquid of the sludge slurry to be dried.

3. The sludge drying apparatus according to claim 2, wherein the spraying mechanism (110) comprises a spraying head (110a) and a spraying chamber (110b) having an elongated opening, and the spraying liquid of the sludge slurry to be dried sprayed from the spraying head (110a) is sprayed out through the elongated opening of the spraying chamber (110 b).

4. The sludge drying apparatus as claimed in claim 3, wherein the liquid outlet (110aa) of the spray header (110a) is located inside the spray chamber (110 b).

5. The sludge drying apparatus according to claim 2, wherein the spraying mechanism (110) is disposed above the feeding mechanism (112), the feeding mechanism (112) comprises an inclined surface (112a), the liquid absorbing particles roll down along the inclined surface (112a), and the spraying liquid is sprayed on the inclined surface (112 a).

6. Sludge drying apparatus according to claim 1, wherein the squeezing device (12) comprises a squeezing mechanism (120) and a squeezing chamber (122), the squeezing chamber (122) is used for containing the mixture to be squeezed, the mixture is squeezed in the squeezing chamber (122), the bottom of the squeezing chamber (122) is a screen, and the squeezed liquid is filtered and discharged through the screen.

7. The sludge drying apparatus according to claim 6, wherein the pressing mechanism (120) comprises a base body (120a), a pressing plate (120b), and a power source (120c) and a deformable connecting member (120d) for connecting the base body (120a) and the pressing plate (120b), the base body (120a) is fixedly arranged, the power source (120c) drives the pressing plate (120b) to move relative to the base body (120a) to generate a moving stroke for pressing the mixture, and the deformable connecting member (120d) generates deformation which does not interfere with the movement of the pressing plate (120b) in the moving stroke of the pressing plate (120 b).

8. The sludge drying apparatus according to claim 7, wherein the pressing mechanism (120) further comprises a guide portion, and the power source (120c) drives the pressing plate (120b) to move along the guide portion, so as to generate the moving stroke.

9. Sludge drying apparatus according to claim 6, further comprising a conveying device (13), the conveying device (13) being adapted to convey the mixture to the extrusion chamber (122),

the conveying device (13) comprises a bottom conveying belt (130) and two side conveying belts (132), the two side conveying belts (132) are arranged on two opposite sides of the bottom conveying belt (130), the bottom conveying belt (130) moves around the bottom wall of the extrusion cavity (122) in a reciprocating mode, the two side conveying belts (132) respectively move around the side wall of the extrusion cavity (122) in a reciprocating mode, and the bottom conveying belt (130) is a conveying belt of a screen structure.

10. The sludge drying apparatus according to claim 1, further comprising a separating device (14), wherein the mixture is extruded by the extruding device (12) to form a dried mixture, and the separating device (14) is configured to separate liquid-absorbing particles in the dried mixture and solid-phase sludge particles attached to the liquid-absorbing particles.

11. The sludge drying apparatus according to claim 10, wherein the separation device (14) comprises a separation container (140), a vibration portion (142) and/or a stirring portion (144), the separation container (140) is used for containing the drying mixture, the vibration portion (142) is used for driving the separation container (140) to vibrate, and the stirring portion (144) is used for stirring the drying mixture in the separation container (140).

12. Sludge drying apparatus according to claim 11, wherein the bottom of the separation vessel (140) comprises perforations for leaking separated sludge during vibration and/or agitation.

13. The sludge drying apparatus according to claim 11, wherein the stirring portion (144) comprises a rotating shaft (144a) and a stirring rod (144b), the rotating shaft (144a) is rotatably disposed, and the stirring rod (144b) is spirally distributed on the outer wall of the rotating shaft (144 a).

14. The sludge drying apparatus according to claim 11, further comprising a material guiding device (15), wherein the material guiding device (15) is configured to guide the drying mixture into the separating device (14), the material guiding device (15) comprises a material guiding shaft (150) and a spiral material guiding plate (152) disposed around the material guiding shaft (150), and the material guiding shaft (150) is rotatably disposed.