CN107777858B - Sludge freezing granulation method and device - Google Patents
Sludge freezing granulation method and device Download PDFInfo
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- CN107777858B CN107777858B CN201711196182.4A CN201711196182A CN107777858B CN 107777858 B CN107777858 B CN 107777858B CN 201711196182 A CN201711196182 A CN 201711196182A CN 107777858 B CN107777858 B CN 107777858B
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- 239000010802 sludge Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007710 freezing Methods 0.000 title claims abstract description 20
- 230000008014 freezing Effects 0.000 title claims abstract description 20
- 238000005469 granulation Methods 0.000 title claims abstract description 14
- 230000003179 granulation Effects 0.000 title claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 238000007605 air drying Methods 0.000 claims abstract description 4
- 238000000859 sublimation Methods 0.000 claims abstract description 4
- 230000008022 sublimation Effects 0.000 claims abstract description 4
- 238000009834 vaporization Methods 0.000 claims abstract description 4
- 230000008016 vaporization Effects 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000003507 refrigerant Substances 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 9
- 238000007790 scraping Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000009483 freeze granulation Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 238000004108 freeze drying Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000000428 dust Substances 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
- C02F11/20—Treatment of sludge; Devices therefor by thermal conditioning by freezing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/22—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by pressing in moulds or between rollers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method and a device for freezing and granulating sludge, which belong to the field of solid waste treatment and sequentially comprise a roller press, a tooth knife forming machine and a stirring dryer from top to bottom; the method is characterized in that the sludge subjected to simple air drying and precipitation treatment is conveyed to a roller press to be frozen and rolled into a thin mud cake through a feeding machine, the thin mud cake is continuously frozen and cut into strips through a tooth knife forming machine, gravity is broken into particles, the sludge particles enter a sealed stirring type dryer to be heated and turned over for many times, the moisture of the sludge particles is reduced to a specified range through sublimation and vaporization, and the sludge particles are conveyed to a specified position through a discharging machine to finish sludge freeze-drying granulation. The invention adopts the rolling granulation and step-by-step treatment modes, so that the energy utilization rate and the drying effect of the invention are better.
Description
Technical Field
The invention belongs to the field of solid waste treatment, and particularly relates to a sludge freezing granulation method and device.
Background
With the development of the society economy and the urbanization of China, the generation and the quantity of urban sewage are continuously increased. According to the related prediction, urban sewage in China is greatly increased in the future 20 years. At present, the annual dry sludge produced in China is approximately 3 multiplied by 106t, and along with the development of domestic sewage treatment industry, the total treatment water quantity and the treatment degree of a sewage treatment plant are continuously enlarged and improved, and the produced sludge quantity is also increased. A large amount of sludge cannot be treated timely and reasonably, and becomes a heavy burden of a sewage treatment plant. The sludge also contains a large amount of N, P, K, ca and organic matters, and N, P is mainly in an organic state, can be slowly released and has long-acting property. Sludge is a useful biological resource, if the sludge is reasonably utilized, waste can be changed into valuable, and economic benefit can be increased, so that the technology for effectively treating and utilizing the sludge has important practical significance.
At present, the sludge treatment method is drying and then landfill, but with the development of modern cities, special taking out of a blank space for landfill is not realistic, and in addition, the direct landfill cannot realize the recycling of resources. The method is to dry, pyrolyze and gasify the sludge, so as to realize the recycling of resources. The sludge drying technology is a common technology capable of effectively reducing the water content of the sludge so as to facilitate the follow-up treatment, and particularly, the sludge is heated in specially designed equipment and the water in the sludge is evaporated, so that the effect of removing free water in the sludge can be effectively realized, and meanwhile, the purposes of rapid evaporation can be achieved for gap water, surface bound water and even internal bound water in the sludge; the technology can dry the sludge to the specified water content according to the requirements of subsequent treatment procedures, so that the technology is widely applied to the existing sludge drying.
The sludge drying generally uses a special sludge dryer, takes steam, high-temperature flue gas or heat conduction oil which is loving to heat or even solar energy as a heat source, adopts a direct or indirect heating mode, and is assisted by mixing and stirring so as to achieve the drying purpose. The direct heat transfer type sludge dryer is described in the texts of the invention patent 'sludge drying process and device' and the like applied by the self-power chemical equipment limited company of Suzhou city in 2010, 6 and 22 days, and most of the direct heat transfer type sludge dryer takes high-temperature flue gas of a boiler and the like as heat sources, so that the high-temperature flue gas enters the dryer and then directly contacts wet sludge, and moisture in the wet sludge is directly brought out through a heat convection mode; the mode has high dehumidification efficiency, but because a large amount of flue gas is directly contacted with and separated from wet sludge, the dust content in the fly ash waste heat is huge, and because no proper follow-up dust separation measures are adopted, potential safety hazards such as dust explosion are easy to generate. In the indirect heat transfer type sludge dryer, the sludge and the heat source are not in direct contact, but heat transfer is carried out in a heat conduction mode, for example, an invention patent of a sludge drying and incinerating integrated treatment system and a process thereof, which are applied for the invention, of the university of Zhejiang, 4 and 19 days, provides an indirect heat transfer type sludge drying mode, and the sludge and the heat source are separated by people, so that the sludge and the heat source have good heating flue gas cleanliness and no related dust hidden danger, and are more used; however, due to the current indirect heat transfer type dryer or the static baking mode similar to a kitchen range, the interior of the indirect heat transfer type dryer generates sludge sedimentation under the action of gravity to generate a single-sided heating phenomenon, the heating is not uniform enough, thus the sludge to be treated cannot be dried uniformly, the dehumidification efficiency is poor, even if the fixed teeth and the movable teeth are staggered and the movable teeth are designed in a hollow flue, the structure is complex and complicated, the maintenance is extremely inconvenient, and meanwhile, the phenomenon that the sludge in the fixed teeth is deposited in a large amount in a cavity at the lower part of the fixed teeth and cannot be dried and directly sintered can be caused, and in addition, as the movable tooth surfaces are arranged perpendicular to the rotating shaft direction, the aim of discharging the sludge after drying can not be ensured, so that the mechanism is obviously and can not be realized; in addition, in the current sludge dryer, as the sludge accommodating cavity always needs to be frequently contacted or wet or dry sludge, the wear rate of the accommodating cavity after severe friction is extremely high, and the service life of the accommodating cavity also often influences the actual service efficiency of the whole dryer. How to develop a sludge drying device with reasonable structure, thereby really achieving the purpose of convenient and high-efficiency sludge drying, and being a technical problem to be solved in recent decades at home and abroad.
Chinese patent publication No. CN103693829a discloses a sludge treatment apparatus and process, the apparatus includes a sludge conveyor, a sludge crushing forming machine and a sludge drying machine, a pair of sludge crushing rollers and a pair of sludge bar pressing forming rollers driven by a variable frequency motor are arranged in a sludge hopper of the sludge crushing forming machine from top to bottom; the inner cavity of a drying bin of the sludge drying machine is divided into a drying chamber and a circulating air heating chamber, a plurality of layers of stainless steel mesh belt type conveying tables are arranged in the drying chamber, and a discharge hole of a sludge hopper of the sludge crushing forming machine is positioned right above a conveying start end of a stainless steel mesh belt type conveying table at the topmost layer in the drying bin. The sludge treatment equipment and the process have the remarkable advantages of strong continuous treatment capacity, short period, high efficiency, good treatment effect, no secondary pollution, environmental protection, stable and safe equipment operation, low energy consumption, high automation degree and the like in the process of treating urban domestic sludge.
However, in the process of processing sludge and pressing mud strips, the device can only process the sludge with small water content and low viscosity because the sludge with large water content and viscosity is easy to adhere, and the application range is obviously smaller; on the other hand, the viscosity of the sludge is insufficient to keep the sludge in a strip shape, and the sludge is easy to break and accumulate in the overturning process, so that the drying efficiency of the device is low, the energy conservation is not facilitated, the device adopts a mode of using an additive to keep the forming effect of sludge strips, the drying cost is increased, and the environment-friendly treatment is also not facilitated; it is thus clear that the effect of sludge granulation is critical to the drying process.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method and a device for freezing and granulating sludge, which utilize a freezing technology to roll and granulate and adopt a step-by-step drying treatment mode to ensure that the energy utilization rate and the drying effect of the invention are better.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for freezing and granulating sludge includes such steps as loading the sludge by a feeding machine, simple air drying and depositing, and delivering it to a feeding hopper of roller press; then, the materials are collected by a feed hopper, and then enter a roller press for freezing and rolling into Bao Nibing; thirdly, cutting the thin mud cake into strips by a tooth knife granulator, freezing to further reduce the moisture content of the thin mud cake, and breaking the strip mud under the action of gravity to form particles with non-fixed length; meanwhile, cold air at 0.01 ℃ is sucked through an exhaust fan and an air inlet hole, and negative pressure of about 610.75Pa is formed inside equipment of the roller press and the tooth knife granulator, so that moisture in the frozen sludge is partially sublimated; and finally, the frozen sludge particles enter a closed stirring dryer and are heated and turned for a plurality of times, the moisture of the sludge particles is reduced to a specified range through sublimation or vaporization, and the sludge particles are conveyed to a specified position through a discharging machine, so that sludge drying treatment is completed.
The sludge freezing and granulating device sequentially comprises a roller press, a tooth knife granulator and a stirring dryer from top to bottom;
the feeding hopper is arranged at the feeding port of the roller press, the roller press comprises a disrotatory roller, and the discharging port of the disrotatory roller is provided with a scraping plate which is tightly adhered to the surface of the disrotatory roller;
the feeding port of the tooth knife granulator is in butt joint with the discharging port of the roller press, the tooth knife granulator comprises a counter-rotating tooth knife, a groove is formed in the surface of the counter-rotating tooth knife along the rotating direction, and a groove cleaning plate closely attached to the surface of the counter-rotating tooth knife is arranged at the discharging port of the tooth knife granulator;
the main shafts of the roller press and the tooth knife granulator are hollow shafts, the hollow shafts are provided with an inlet section and an outlet section, the inlet section and the outlet section are separated by a partition or a solid core, and two ends of the partition or the solid core are respectively provided with a hole and a hole; cavities are arranged in the roller press and the tooth knife granulator, and the cavities are respectively connected with the inlet hole and the outlet hole; the tooth knife granulator and the roller press are connected together through a shell, an air inlet is formed in the lower part of the tooth knife granulator, an air outlet is formed in the top of the roller press, and an exhaust fan is arranged at the air outlet;
the stirring dryer is divided into a plurality of layers by a plurality of partition boards, the partition boards are divided into a large partition board with an opening on the outer circle and a small partition board with an opening on the inner circle, a cavity is formed in the partition board, scraping plates are arranged on the upper portion of the partition board, and the scraping plates convey materials of the partition boards to different positions in the same rotation direction through preset different angles; and the feed inlet and the discharge outlet of the stirring dryer are both provided with a sealing type conveyor.
Further, the roller press is single-stage or multi-stage, the number of stages of the roller press is a natural number not more than 10, and the intervals of counter-rotating rollers of the multi-stage roller press are sequentially reduced.
Further, the distance between the pair of rotary drums can be adjusted.
Further, the tooth knife granulator is in a single stage or multiple stages, the number of stages of the tooth knife forming machine is a natural number not more than 10, and the intervals of counter rotating tooth knives of the multiple stages of tooth knife granulator are sequentially reduced.
Further, the distance between the pair of toothed cutters can be adjusted.
Further, the number of the separators is a positive integer not greater than 20.
The beneficial effects of the invention are as follows:
in the rolling process, the refrigerant is introduced into the rolling roller, and in the process of rolling the sludge into the mud cake, the moisture in the mud cake is condensed, so that the mud cake is easier to form and is convenient for the next step of treatment;
during the cutting granulation process of the sludge cake, a refrigerant is added to further condense the moisture in the sludge cake as soon as possible, so that the granulation effect is ensured;
meanwhile, cold air at 0.01 ℃ is formed by using an external environment or equipment and enters the equipment, and negative pressure of about 610.75Pa is formed in the equipment of the roller press and the tooth knife granulator through an exhaust fan, so that the three-phase point of ice dust in sludge particles is reached, the ice dust is sublimated under the condition that the form of the sludge particles is not damaged, and meanwhile, the generation of peculiar smell is reduced;
after the basically granulated sludge enters a closed stirring dryer, the scraping plates convey the granulated sludge to a multistage partition board for heating, drying and turning, and a high-temperature and high-pressure environment is formed in the dryer, so that ice water in the sludge sublimates or/and vaporizes, and the drying granulation is more thorough.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a front view structure of the present invention.
Fig. 2 is a schematic view showing the bottom structure of the roll squeezer.
FIG. 3 is a schematic view of a sectional A-A structure of the roll squeezer of the present invention.
Fig. 4 is a schematic view showing a bottom view of the serrated knife forming machine of the present invention.
FIG. 5 is a schematic view showing a B-B cross-sectional structure of the tooth blade forming machine of the present invention.
Fig. 6 is a schematic diagram showing a front view of the stirring dryer of the present invention.
FIG. 7 is a schematic view showing a C-C sectional structure of the agitation type dryer of the present invention.
FIG. 8 is a schematic view showing a D-D sectional structure of the agitation type dryer of the present invention.
In the figure: 1-a feeding machine, 2-a roller press, 21-a roller press refrigerant outlet, 22-a feeding hopper, 23-an exhaust outlet, 24-a roller press refrigerant inlet, 25-a counter-rotating roller, 26-a scraping plate and 27-a counter-rotating roller main shaft; 3-tooth cutter forming machine, 31-tooth cutter forming machine coolant inlet, 32-tooth cutter forming machine coolant outlet, 33-air inlet, 34-counter-rotating gear hobbing cutter, 35-groove cleaning plate and 36-counter-rotating gear hobbing cutter main shaft; 4-stirring type dryer, 41-hot air inlet, 42-dryer heating medium inlet and outlet, 43-power device, 44-speed reducer, 45-dryer discharge port, 46-dryer feed port, 47-moisture discharge port, 48 a-forward scraper, 48 b-reverse scraper, 49 a-small partition plate and 49 b-large partition plate; 5-discharging machine and 6-exhaust fan.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, the sludge freezing granulation device comprises a roller press 2, a tooth knife granulator 3 and a stirring dryer 4 from top to bottom.
As shown in fig. 2 and 3, a feed hopper 22 is arranged at a feed inlet of the roller press 2, the roller press 2 comprises a counter-rotating roller 25, the space between the counter-rotating roller 25 can be adjusted, and the space adjusting device comprises a screw rod, a cylinder or/and an oil cylinder which are respectively arranged at two ends of the roller; the thickness of the sludge cake is in a proper range through the adjustment of the interval, so that the next slitting is facilitated. The scraping plate 26 which is tightly attached to the surface of the disrotatory roller 25 is arranged at the discharge hole of the disrotatory roller 25, and the scraping plate 26 can prevent the sludge cake from being adhered to the surface of the roller due to viscosity, so that the forming rate and the production speed of the sludge cake are reduced.
As shown in fig. 4 and 5, the feed inlet of the toothed cutter granulator 3 is abutted against the discharge outlet of the roller press 2, the toothed cutter granulator 3 comprises a pair of rotary cutters 34, grooves are formed in the surfaces of the pair of rotary cutters 34 along the rotating direction, the distance between the pair of rotary cutters 34 can be adjusted, and the device for adjusting the distance comprises a screw rod, a cylinder or/and an oil cylinder which are respectively arranged at two ends of a roller; through the adjustment of interval, make the shape of sludge strip in suitable scope for easier fracture becomes smaller granule. The discharge hole of the toothed knife granulator 3 is provided with a groove cleaning plate 35 which is tightly attached to the surface of the counter-rotating toothed knife 34, the shape of a notch of the groove cleaning plate 35 is matched with the shape of the groove bottom and the groove surface of the counter-rotating toothed knife 34, and the groove cleaning plate 35 timely cleans sludge particles adhered to the groove bottom and the groove surface of the counter-rotating toothed knife 34, so that the running efficiency of equipment is improved.
The counter-rotating roller main shaft 27 of the roller press 2 and the counter-rotating serrated knife main shaft 36 of the serrated knife granulator 3 are hollow shafts, an air inlet section and an air outlet section are arranged on the hollow shafts, the air inlet section and the air outlet section of the counter-rotating roller main shaft 27 are respectively connected with the roller press refrigerant outlet 21 and the roller press refrigerant inlet 24, and the air inlet section and the air outlet section of the counter-rotating serrated knife main shaft 36 are respectively connected with the serrated knife granulator refrigerant inlet 31 and the serrated knife granulator refrigerant outlet 32.
The air inlet section and the air outlet section are separated by a partition or a solid core, and two ends of the partition or the solid core are respectively provided with an inlet hole and an outlet hole; cavities are arranged in the roller press 2 and the tooth knife granulator 3 and are respectively connected with the inlet hole and the outlet hole; the refrigerant 5 enters the internal cavities of the roller press 2 and the tooth knife granulator 3 through the inlet hole of the air inlet section, the temperature of equipment and sludge on the equipment is reduced, the equipment and the sludge on the equipment are frozen, the equipment is discharged from the appointed position outside the equipment through the outlet hole and the exhaust section, and the refrigerant is low-temperature fluid provided by external equipment; in the sludge treatment process, the roller press 2 and the tooth knife granulator 3 continuously accelerate the rolling and freezing of the sludge through freezing, so that the final granulating effect is better and more remarkable.
The toothed knife granulator 3 and the roller press 2 are externally connected together, and air is introduced through an air inlet 33 arranged at the lower part of the toothed knife granulator 3 and is exhausted through an exhaust fan 6 arranged at an air outlet 23 at the top of the roller press 2 in the rolling process.
As shown in fig. 6, 7 and 8, the stirring dryer 4 is cylindrical with upper and lower end caps, the upper end cap is provided with a dryer feed port 46 and a moisture discharge port 47, and the lower end cap is provided with a dryer discharge port 45, a dryer heating medium inlet 41 and a dryer heating medium outlet 42; the inside of the dryer is divided into a plurality of layers by a plurality of partition boards, the partition boards are divided into a large partition board 49b with an opening at the outer circle and a small partition board 49a with an opening at the inner circle, a heating cavity is arranged in the partition boards, the heating cavity is respectively connected with a dryer heating medium inlet 41 and a dryer heating medium outlet 42 through pipelines, and sludge particles are indirectly heated by the heating partition boards, so that a high-temperature and high-pressure environment is formed in the dryer, water or ice dust in the sludge particles is vaporized and sublimated, and the purpose of drying the sludge particles is achieved; the moisture discharging port 47 discharges high-temperature steam to the outside through a valve at random, so that the internal environment is ensured, and meanwhile, the water vapor in the sludge is discharged; the heating medium includes a high temperature fluid provided by an external device.
The upper part of the partition board is provided with a scraper, the scraper is preset with different angles and is fixed on a main shaft of the dryer through a framework, and when the main shaft of the dryer is in the same rotation direction, the material of the partition board is conveyed to different positions through a forward scraper 48a arranged in the forward direction or a reverse scraper 48b arranged in the reverse direction, and falls on a large partition board 49b with an opening at the outer circle of the lower layer or a small partition board 49a with an opening at the inner circle until falling out of a discharge hole 45 of the dryer; the lower part of the main shaft is provided with a power device 43 and a speed reducer 44 for providing power for the rotation of the main shaft, the power device 43 comprises a motor and a fuel or gas engine, and the speed reducer 44 comprises a bevel gear speed reducer, a parallel gear speed reducer and a planet gear speed reducer.
The feed inlet 46 and the discharge outlet 45 of the stirring dryer are provided with sealing type conveyors, each sealing type conveyor comprises a sealing type shaftless screw conveyor, and screw blades of the sealing type shaftless screw conveyor are provided with partition plates, so that O-shaped shells of the sealing type shaftless screw conveyor and screw blades with the partition plates form a plurality of sealing cavities, and the sealing performance of equipment is maintained while material conveying is ensured in working.
The steam generated by the evaporation of the roller press 2 and the tooth knife granulator 3 is discharged from the air outlet 23, the steam generated by the evaporation of the stirring dryer 4 is discharged from the moisture outlet 47 arranged on the top cover, and if the odor exists, the air discharged from the air outlet 23 and the moisture outlet 47 can be collected, enter the spray tower for deodorization and then be discharged.
A method for freezing and granulating sludge comprises the steps of firstly, conveying sludge subjected to simple air drying and sedimentation treatment to a feeding funnel 22 of a roller press 2 through a feeding machine 1; then, the material is collected by the feeding funnel 22 and then enters the roller press 2 to be frozen and rolled into Bao Nibing; thirdly, the tooth knife granulator 3 cuts the thin mud cake into strips, and freezes the strips to further reduce the moisture content of the thin mud cake, and the strip mud is disintegrated under the action of gravity to form particles with non-fixed length; simultaneously, cold air is sucked through the exhaust fan 6 and the air inlet 33, so that the moisture in the frozen sludge is partially sublimated; finally, the frozen sludge particles enter a closed stirring dryer 4 to be heated and turned for a plurality of times, the moisture of the sludge particles is reduced to a specified range through sublimation or vaporization, and the sludge particles are transported to a specified position through a discharging machine 5 to complete sludge drying treatment.
Example 2
The main structure of this embodiment is substantially the same as that of the first embodiment, except that: the number of stages of the roller press 2 is a natural number not more than 10, preferably 3 stages, and the intervals of the counter-rotating rollers 25 of the roller press 2 are sequentially reduced; the number of stages of the tooth knife granulator 3 is a natural number not more than 10, preferably 2 stages, and the intervals between the counter rotating teeth 34 of the tooth knife granulator 3 are sequentially reduced. The purpose of this design is to ensure the molding rate and at the same time, the energy utilization is more efficient.
It should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (7)
1. The utility model provides a mud freezing prilling granulator which characterized in that: the device comprises a roller press (2), a tooth knife granulator (3) and a stirring dryer (4) from top to bottom in sequence;
the feeding hopper (22) is arranged at the feeding port of the roller press (2), the roller press (2) comprises a disrotatory roller (25), and a scraping plate (26) which is tightly adhered to the surface of the disrotatory roller (25) is arranged at the discharging port of the disrotatory roller (25);
the feeding port of the tooth knife granulator (3) is in butt joint with the discharging port of the roller press (2), the tooth knife granulator (3) comprises a counter-rotating tooth knife (34), a groove is formed in the surface of the counter-rotating tooth knife (34) along the rotating direction, and a groove cleaning plate (35) which is tightly attached to the surface of the counter-rotating tooth knife (34) is arranged at the discharging port of the tooth knife granulator (3);
the rotary roller main shaft (27) of the roller press (2) and the rotary toothed cutter main shaft (36) of the toothed cutter granulator (3) are hollow shafts, an air inlet section and an air outlet section are arranged on the hollow shafts, the air inlet section and the air outlet section of the rotary roller main shaft (27) are respectively connected with a roller press refrigerant outlet (21) and a roller press refrigerant inlet (24), and the air inlet section and the air outlet section of the rotary toothed cutter main shaft (36) are respectively connected with a toothed cutter granulator refrigerant inlet (31) and a toothed cutter granulator refrigerant outlet (32);
the air inlet section and the air outlet section are separated by a partition or a solid core, and two ends of the partition or the solid core are respectively provided with an inlet hole and an outlet hole; cavities are arranged in the roller press (2) and the tooth knife granulator (3), and are respectively connected with the inlet hole and the outlet hole; the refrigerant (5) enters the internal cavities of the roller press (2) and the tooth knife granulator (3) through the inlet hole of the air inlet section, the temperature of equipment and sludge on the equipment is reduced, the equipment and the sludge on the equipment are frozen, and the refrigerant is discharged out of the equipment through the outlet hole and the exhaust section;
the tooth knife granulator (3) and the roller press (2) are connected together through a shell, an air inlet (33) is formed in the lower part of the tooth knife granulator (3), an air outlet (23) is formed in the top of the roller press (2), and an exhaust fan (6) is arranged at the air outlet;
the stirring dryer (4) is divided into a plurality of layers by a plurality of partition boards, the partition boards are divided into a large partition board (49 b) with an outer circular opening and a small partition board (49 a) with an inner circular opening, a heating cavity is arranged in the partition boards, scrapers are arranged on the upper parts of the partition boards, the scrapers pass through preset different angles, and when the main shaft of the dryer is in the same rotation direction, materials of the partition boards are conveyed to different positions by a forward scraper (48 a) arranged in a forward direction or a reverse scraper (48 b) arranged in a reverse direction, and fall down on the large partition board (49 b) with the outer circular opening or the small partition board (49 a) with the inner circular opening at the lower layer until falling out of a discharge hole (45) of the dryer; and the feed inlet and the discharge outlet of the stirring dryer are both provided with a sealing type conveyor.
2. A sludge freezing granulation apparatus as claimed in claim 1, wherein: the roller press (2) is single-stage or multi-stage, the number of stages of the roller press (2) is a natural number not more than 10, and the intervals of the counter-rotating rollers (25) of the multi-stage roller press (2) are sequentially reduced.
3. A sludge freezing granulation apparatus as claimed in claim 1 or 2, wherein: the distance between the pair of rotary drums (25) can be adjusted.
4. A sludge freeze granulation apparatus as claimed in claim 3 wherein: the tooth knife granulator (3) is in a single stage or multiple stages, the number of stages of the tooth knife forming machine (3) is a natural number not more than 10, and the intervals between counter rotating tooth knives (34) of the multiple stages of tooth knife granulator (3) are sequentially reduced.
5. A sludge freezing granulation apparatus as claimed in claim 1 or 4, wherein: the distance between the pair of rotary tooth cutters (34) can be adjusted.
6. A sludge freezing granulation apparatus as claimed in claim 1, wherein: the number of the partition plates is a positive integer not more than 20.
7. A method of freeze-granulating sludge by using the apparatus for freeze-granulating sludge according to any one of claims 1 to 6, characterized in that: firstly, transporting sludge subjected to simple air drying and sedimentation treatment to a feeding funnel (22) of a roller press (2) through a feeding machine (1);
then, the materials are collected by a feed hopper (22) and then enter a roller press (2) for freezing and rolling into a thin mud cake;
thirdly, the tooth knife granulator (3) cuts the thin mud cake into strips, and the strips are frozen to further reduce the moisture content of the thin mud cake, and the strip mud is disintegrated under the action of gravity to form particles with unfixed length;
simultaneously, cold air is sucked through the exhaust fan (6) and the air inlet (33), so that the moisture in the frozen sludge is partially sublimated;
and finally, the frozen sludge particles enter a closed stirring dryer (4) and are heated and turned for a plurality of times, the moisture of the sludge particles is reduced to a specified range through sublimation or vaporization, and the sludge particles are transported to a specified position through a discharging machine (5) to finish sludge drying treatment.
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| CN108745201A (en) * | 2018-08-15 | 2018-11-06 | 浙江森友环保成套设备有限公司 | A kind of mud granulizing mechanism |
| CN109160705B (en) * | 2018-09-21 | 2019-11-01 | 营口宇佳科技有限公司 | Energy-efficient sludge freezing processing equipment |
| CN112209591A (en) * | 2020-10-29 | 2021-01-12 | 王高峰 | Intelligent industrial sludge treatment device and method |
| CN113003916B (en) * | 2021-02-09 | 2022-06-10 | 杭州国泰环保科技股份有限公司 | Nested formula sludge low temperature mummification prilling granulator |
| CN113769845A (en) * | 2021-09-18 | 2021-12-10 | 方运平 | Ultralow-temperature dehydration and crushing mechanism, and municipal sludge treatment method and application thereof |
| CN114735914A (en) * | 2022-02-28 | 2022-07-12 | 山东水利建设集团有限公司巨野分公司 | Comprehensive sludge concentration tank system |
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Denomination of invention: A method and device for sludge freezing granulation Granted publication date: 20230908 Pledgee: Tangyin Xingfu Village Bank Co.,Ltd. Pledgor: Torch Technology (Henan) Co.,Ltd. Registration number: Y2024980002209 |