CN114804573A - Sludge forming belt type drying system and drying process thereof - Google Patents
Sludge forming belt type drying system and drying process thereof Download PDFInfo
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- CN114804573A CN114804573A CN202210333505.4A CN202210333505A CN114804573A CN 114804573 A CN114804573 A CN 114804573A CN 202210333505 A CN202210333505 A CN 202210333505A CN 114804573 A CN114804573 A CN 114804573A
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- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
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- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a sludge forming belt type drying system and a drying process thereof. The system comprises a sludge bin, a sludge forming machine and a belt type drier which are connected in sequence; the sludge bin comprises a semi-dry sludge bin and a wet sludge bin, the sludge forming machine comprises a semi-dry sludge forming machine and a wet sludge forming machine, the semi-dry sludge bin is connected with the semi-dry sludge forming machine through a scraper conveyor, the wet sludge bin is connected with the wet sludge forming machine through a conveying pipeline, and a sludge conveying pump is arranged on the conveying pipeline; the sludge outlet of the belt drier conveys the dried sludge to a downstream treatment system through a discharge conveying system, and the waste gas outlet of the belt drier is sequentially connected with an air-air heat exchanger and a waste gas treatment unit. The invention can dry wet sludge with higher water content or semi-dry sludge with lower water content to the water content of about 15 percent, has wide sludge application range and high drying efficiency, and meets the requirement of large-scale factory-type sludge drying treatment.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a sludge forming belt type drying system and a drying process thereof.
Background
Sludge treatment and disposal has become a sensitive global environmental issue, and sludge drying incineration can reduce the volume of sludge to the minimum (more than 90% reduction). The sludge treatment can recover energy and is used for drying the sludge or generating electricity and supplying heat; can completely carbonize organic matters, kill pathogens and make sludge thoroughly harmless. However, since the water content of the sludge generated in the sewage treatment plant is high, the sludge cannot be directly used as a power generation fuel, and the sludge needs to be dried to be used as the power generation fuel.
Belt drying is a technology that has not started to be "popular" until 2002. The application publication number is CN 103011546A's Chinese invention patent application, discloses two segmentation sludge drying and energy recovery system and mummification technology, and it includes the sludge storage room, the gas vent of sludge storage room is connected with deodorization reactor through a fan, and the mud mouth of sludge storage room passes through the sludge pump and is connected with the mud entrance point of desiccator, and the mud exit end department of desiccator is equipped with the sludge molding machine, and the mud discharge gate department of sludge molding machine is equipped with the belt mummification machine. The two-stage drying mode of the system dries the sludge with the water content of 70-85% to the granular sludge with the solid content of 70-90% finally, the system is high in heat transfer efficiency, small in gas carrying capacity, low in heat loss, basically free of dust, efficient and energy-saving in the energy recovery system, and the energy saving rate reaches about 30%. Although the sludge drying system has low heat loss when sludge is dried, formed and dried by a belt, the sludge drying system is suitable for sludge with the water content of 70-85% and has a small application range.
Disclosure of Invention
The invention provides a sludge forming belt type drying system and a drying process thereof, aiming at achieving the purpose of drying sludge with different water contents. The invention can dry wet sludge with higher water content or semi-dry sludge with lower water content to the water content of about 15 percent, has wide sludge application range and high drying efficiency, and meets the requirement of large-scale factory-type sludge drying treatment.
The invention specifically adopts the following technical scheme:
a sludge forming belt type drying system comprises a sludge bin, a sludge forming machine and a belt type drying machine which are sequentially arranged; the sludge bin comprises a semi-dry sludge bin and a wet sludge bin, the sludge forming machine comprises a semi-dry sludge forming machine and a wet sludge forming machine, the semi-dry sludge bin is connected with the semi-dry sludge forming machine through a scraper conveyor, the wet sludge bin is connected with the wet sludge forming machine through a conveying pipeline, and a sludge conveying pump is arranged on the conveying pipeline; the discharge port of the wet sludge forming machine and the discharge port of the semi-dry sludge forming machine are positioned above the conveyor belt of the belt type drying machine; the sludge outlet of the belt type drier conveys the dried sludge to a downstream treatment system through a discharge conveying system, and the waste gas outlet of the belt type drier is sequentially connected with an air-air heat exchanger and a waste gas treatment unit.
The semi-dry sludge storage bin is characterized in that a semi-dry sludge feeding port is formed above the semi-dry sludge storage bin, a grid is arranged at the semi-dry sludge feeding port, a bin cover is arranged above the grid and driven by a hydraulic rod, a sliding frame system is arranged in the semi-dry sludge storage bin, the sliding frame is driven by a hydraulic station outside the semi-dry sludge storage bin, a spiral conveyor is arranged below the sliding frame, a semi-dry sludge discharging port is formed in the semi-dry sludge storage bin and corresponds to the tail end of the spiral conveyor, and a scraper conveyor is arranged at the semi-dry sludge discharging port. Wherein the sliding frame comprises a sliding rod, and the hydraulic station drives the sliding rod to realize the reciprocating sliding of the sliding frame. The slide bar is provided with a front supporting plate and a rear supporting plate, a gap is reserved between the front supporting plate and the rear supporting plate, and the lower part of the gap is the screw conveyor of the semi-dry sludge bin. The front supporting plate is provided with a front pushing plate inclining towards the direction of the hydraulic station, and the rear supporting plate is provided with a rear pushing plate inclining towards the opposite direction of the hydraulic station.
The top of wet sludge bin is provided with the pan feeding mouth, and pan feeding mouth department is provided with the grid, and the grid top is provided with the cang gai, and this cang gai is provided with screw conveyer by the hydraulic stem drive in the wet sludge bin, specifically can be double screw conveyer, the feed bin lateral wall of screw conveyer one side is the flitch down, flitch slope sets up down, and the terminal department that corresponds screw conveyer on the wet sludge bin is provided with the feed opening, feed opening department is provided with pipeline.
And a half-dry sludge feeding device is arranged between the feed opening of the scraper conveyor and the feed opening of the half-dry sludge forming machine, and the half-dry sludge conveyed by the scraper conveyor is uniformly conveyed to the feed opening of the half-dry sludge forming machine through the half-dry sludge feeding device. The semi-dry sludge feeding device comprises a feeding trough and a paving unit, wherein a feed opening of the scraper conveyor is positioned above the feeding trough, the two side walls of the feeding trough are in transmission connection with the paving unit, and the paving unit reciprocates along the side walls of the feeding trough; in addition, a feeding groove discharge port is arranged below the side wall of the feeding groove. The wall of the feeding groove is provided with a chain wheel, the chain wheel is driven by a motor, and the paving unit is in transmission connection with the chain wheel to realize the reciprocating motion of the paving unit on the U-shaped feeding groove. In order to enhance the stability of the movement of the paving unit, slide rails are further arranged on the two side walls of the feeding groove, a slide block is arranged on the paving unit, and the slide block and the slide rails are matched with each other, so that the paving unit can move on the feeding groove more stably. The bottom of the feeding groove is also provided with a grid-shaped forming plate, and a blank part of the grid is arranged at a position close to the discharge hole of the feeding groove, so that the sludge discharged from the discharge hole of the feeding groove is rectangular sludge pieces. The unit of paving includes the supporting part and the portion of paving, the supporting part sets up in the top of throwing two lateral walls of material groove and with throw the material groove lateral wall transmission and be connected, is provided with the portion of paving between the supporting part, the portion of paving is located the material groove of throwing, the portion of paving includes from last a plurality of the subassembly of paving that sets up extremely down, the subassembly of paving all includes the first and second of the spreading board of spreading, and the formation triangle-shaped structure is connected at the first and second tops of spreading board.
The outer side of the supporting part is provided with a first connecting plate, the inner side of the first connecting plate is provided with a sliding block, and the sliding block is matched with a sliding rail on the side wall of the feeding groove. The inboard of supporting part is provided with the second connecting plate, be provided with the subassembly that paves on the second connecting plate, the direction of motion of the subassembly and the supporting part of paving is perpendicular, and the setting or the dislocation set that correspond from top to bottom between each subassembly that paves, the setting of the subassembly that paves can make half-dry mud pave more evenly.
The semi-dry sludge forming machine is arranged below the semi-dry sludge feeding device and comprises a box body and compression rollers which are arranged in the box body in pairs, the compression rollers are driven by a driving unit, a supporting base is arranged at the tail end of each compression roller, and the driving unit is arranged on each supporting base. A scraper mechanism is arranged below the compression roller, and the scraper mechanism can be the prior art.
The wet sludge forming machine comprises a sludge distributor and a wet noodle machine body, wherein the sludge distributor comprises a [ -shaped first distribution pipe and a linear section-shaped second distribution pipe connected with the first distribution pipe, the second distribution pipe is connected with the wet noodle machine body through a flexible connection pipe, the wet noodle machine body comprises a pre-forming area and a forming area, the pre-forming area comprises a stirring bin, a stirring roller is arranged in the stirring bin, the forming area is arranged below the stirring roller and comprises a forming groove, the forming groove is positioned at the bottom of the stirring bin, a forming hole is formed in the bottom of the forming groove, the forming hole comprises a straight hole section and a circular truncated cone-shaped hole section with the diameter gradually reduced from top to bottom, and wet sludge is formed; as another embodiment, if the thickness of the bottom of the forming groove is not enough, the circular truncated cone-shaped hole section at the lower part of the forming hole can extend out of the bottom of the forming groove.
The belt type dryer comprises a dryer cavity, a sludge feeding opening is formed in the upper portion of the dryer cavity, the sludge feeding opening is located below a discharge port of a wet sludge forming machine and a discharge port of a semi-dry sludge forming machine, a sludge discharge port is formed in the bottom of the dryer cavity, an upper conveying belt and a lower conveying belt are arranged in the dryer cavity, the upper conveying belt and the lower conveying belt are in chain wheel transmission, the upper conveying belt and the lower conveying belt are parallel and staggered, the two are opposite in movement direction, the front end of the upper conveying belt is located below the sludge feeding opening, the tail end of the upper conveying belt is located above the lower conveying belt, the upper conveying belt can receive noodle-shaped sludge from the wet sludge forming machine and the semi-dry sludge forming machine, and the upper conveying belt can convey the sludge to the lower conveying belt to continue drying. The sludge discharge port of the belt type drier is positioned at the tail end of the lower conveyor belt. And air holes are formed in the upper conveying belt and the lower conveying belt and provide uniform air flow for sludge on the conveying belts.
And a sludge discharge port of the belt type drying machine is connected with a dry sludge cooling conveyor for conveying the dry sludge to a downstream treatment system.
The drying process of the sludge forming belt type drying system comprises the following steps:
conveying the sludge with different water contents after primary treatment to a wet sludge bin or a semi-dry sludge bin, and conveying the sludge in the wet sludge bin to a wet sludge forming machine above a belt type drying machine through a sludge conveying pump; the sludge in the semi-dry sludge bin is conveyed to the upper part of the belt type drying machine through a scraper conveyor at the bottom of the semi-dry sludge bin, and then enters a semi-dry sludge forming machine through a semi-dry sludge feeding device, noodle-shaped sludge extruded by the wet sludge forming machine and the semi-dry sludge forming machine is uniformly spread on an upper conveying belt of the belt type drying machine, and hot air in a cavity of the belt type drying machine penetrates through the upper conveying belt and the lower conveying belt to dry the sludge. The dry sludge falls into the sludge cooling conveyor at the tail end of the lower transmission belt and is conveyed to a downstream processing system, such as a granulating workshop bin through a bucket elevator and a belt. In addition, gas after heat exchange of the belt type drier is treated by a desulfurization and PPCP flue gas treatment system and then is discharged after reaching standards.
Wherein the wet sludge is sludge with the water content of 80-85%, and the semi-dry sludge is sludge with the water content of 50-70%.
The invention has the beneficial effects that:
the invention realizes the simultaneous treatment of the sludge with different water contents, has wider application range of the sludge, saves the pretreatment operation of the sludge, has high drying efficiency and meets the requirement of large-scale factory-type sludge drying treatment. In addition, the sludge drying process adopts the conveying belt to convey, the sludge is static relative to the conveying belt, the drying mode reduces dust precipitation, and meanwhile, the equipment is small in abrasion, low in failure rate and low in running cost.
Drawings
FIG. 1 is a first structural schematic view of a sludge-forming belt-type drying system according to the present invention;
FIG. 2 is a schematic structural view of a sludge-forming belt-type drying system according to the present invention;
FIG. 3 is a third schematic structural view of a sludge-forming belt-type drying system according to the present invention;
FIG. 4 is an enlarged view taken at A in FIG. 1;
FIG. 5 is a schematic structural view of a semi-dry sludge feeding device;
FIG. 6 is a schematic structural view of a feeding groove and a forming plate;
FIG. 7 is a schematic illustration of a second connecting plate and a paving assembly.
Fig. 8 is a schematic diagram of the structure of the press roll and doctor mechanism.
Fig. 9 is a schematic structural view of the doctor mechanism.
FIG. 10 is a schematic structural view of a wet sludge forming machine;
FIG. 11 is a schematic structural view of a body of a wet noodle maker in a wet sludge forming machine;
FIG. 12 is a schematic structural view of a belt dryer;
FIG. 13 is a schematic diagram of the upper and lower belts and chamber of the belt dryer;
FIG. 14 is a schematic view of a sludge drying process of the present invention.
In the drawing, 1 is a half-dry sludge bin, 11 is a screw conveyor, 12 is a scraper conveyor, 13 is a slide rod, 14 is a front support plate, 15 is a rear support plate, 16 is a front push plate, 17 is a rear push plate, 18 is a hydraulic station, 2 is a wet sludge bin, 21 is a blanking plate, 22 is a conveying pipeline, 3 is a half-dry sludge forming machine, 31 is a press roller, 32 is a scraper mechanism, 321 is a mounting plate, 322 is a scraper, 323 is a tension spring, 324 is a limiting block, 325 is a hinged rod, 326 is an adjusting rod, 327 is a hinged ring, 328 is a threaded rod, 4 is a wet sludge forming machine, 41 is a first distribution pipe, 42 is a second distribution pipe, 43 is a flexible connecting pipe, 44 is a stirring bin, 45 is a stirring roller, 46 is a forming groove, 47 is a forming hole, 5 is a belt type drier, 50 is a drier chamber, 51 is a first drying chamber, 52 is a second drying chamber, 53 is a third drying chamber, 54 is a fourth drying chamber, 55 is the fifth drying chamber, 56 is last conveyer belt, 57 is the lower conveyer belt, 6 is half-dry mud feeding device, 61 is the feeding groove, 611 is the slide rail, 612 is the sprocket, 62 is the unit that paves, 621 is the supporting part, 622 is the portion of paving, 623 first connecting plate, 624 second connecting plate, 625 first paving component, 626 second paving component, 627 is the third paving component, 63 is the feeding groove discharge gate, 64 is the shaping board, 7 is the cang gai, 81 is the air-air heat exchanger, 82 is exhaust-gas treatment unit, 9 is the hot-blast furnace, 10 is the cooling conveyer, 0 is the dry mud feed bin.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments for understanding the technical solutions of the present invention, but the present invention is not limited to the scope of the present invention.
As shown in fig. 1 to 4, a sludge forming belt type drying system comprises a sludge bin, a sludge forming machine and a belt type drying machine which are arranged in sequence; the sludge storage bin comprises a semi-dry sludge storage bin 1 and a wet sludge storage bin 2, the sludge forming machine comprises a semi-dry sludge forming machine 3 and a wet sludge forming machine 4, the semi-dry sludge storage bin 1 is connected with the semi-dry sludge forming machine 3 through a scraper conveyor 12, the wet sludge storage bin 2 is connected with the wet sludge forming machine 4 through a conveying pipeline 22, a sludge conveying pump is arranged on the conveying pipeline 22, and the sludge conveying pump specifically adopts a screw pump; the discharge port of the wet sludge forming machine 4 and the discharge port of the semi-dry sludge forming machine 3 are positioned above the conveyor belt of the belt type drier 5; the sludge discharge port of the belt type drier 5 conveys the dried sludge to a downstream processing system through a discharge conveying system, and the waste gas outlet of the belt type drier 5 is sequentially connected with an air-air heat exchanger 81 and a waste gas processing unit 82.
The semi-dry sludge storage bin is characterized in that a semi-dry sludge feeding port is formed above the semi-dry sludge storage bin 1, a grid is arranged at the semi-dry sludge feeding port, a bin cover 7 is arranged above the grid, the bin cover 7 is driven by a hydraulic rod, a sliding frame system is arranged in the semi-dry sludge storage bin 1, the sliding frame is driven by a hydraulic station 18 outside the semi-dry sludge storage bin 1, a spiral conveyor 11 is arranged below the sliding frame, a semi-dry sludge discharging port is formed in the tail end, corresponding to the spiral conveyor 11, of the semi-dry sludge storage bin 1, and a scraper conveyor 12 is arranged at the semi-dry sludge discharging port. In this embodiment, the carriage comprises a slide bar 13, and the hydraulic station 18 effects the reciprocating sliding of the carriage by driving the slide bar 13. The slide bar 13 is provided with a front support plate 14 and a rear support plate 15, a gap is reserved between the front support plate 14 and the rear support plate 15, and the lower part of the gap is the screw conveyor 11 of the semi-dry sludge bin 1. The front support plate 14 is provided with a front push plate 16 inclined toward the hydraulic station 18, and the rear support plate 15 is provided with a rear push plate 17 inclined opposite to the hydraulic station 18.
Before sludge with the water content of 50% -70% is conveyed to the semi-dry sludge bin 1, a bin cover 7 on the semi-dry sludge bin 1 is opened by a hydraulic rod, blanking is performed above the grating, the grating can block large-volume mud blocks or stones, and the sludge can be prevented from causing large impact on the semi-dry sludge bin 1 during blanking. When the sludge in the semi-dry sludge bin 1 is to be dried, the spiral conveyor 11 and the scraper conveyor 12 in the semi-dry sludge bin 1 are opened, and the spiral conveyor 11 continuously conveys the sludge in the semi-dry sludge bin 1 to the scraper conveyor 12 through the semi-dry sludge feed opening. At the moment, the hydraulic station 18 can be opened to drive the sliding frame system, the sliding frame system reciprocates in the semi-dry sludge bin 1, when the sliding frame system moves forwards, the front push plate 16 pushes the sludge to move forwards, and when the sliding frame system moves backwards, the rear push plate 17 drives the sludge to move backwards, so that the sludge in the semi-dry sludge bin 1 is prevented from arching.
Wet sludge bin 3's top is provided with the pan feeding mouth, and pan feeding mouth department is provided with the grid, and the grid top is provided with cang gai 7, and this cang gai 7 is provided with screw conveyer 11 by hydraulic stem drive in the wet sludge bin 2, is double screw conveyer in this embodiment, the feed bin lateral wall of screw conveyer 11 one side is flitch 21 down, flitch 21 slope sets up down, and the terminal department that corresponds screw conveyer 11 on the wet sludge bin 2 is provided with the feed opening, feed opening department is provided with pipeline 22.
Before carrying 80% ~ 85% water content mud to wet sludge bunker 2, utilize the hydraulic stem to open cang gai 7 on the wet sludge bunker 2, at grid top unloading, the setting of grid can block bulky mud piece or stone, and mud causes great impact to wet sludge bunker 2 when can also preventing the unloading. During the unloading, the lower flitch 21 of slope setting can further reduce the impact of mud to wet sludge storage bin 2. When the sludge in the wet sludge bin 2 is to be dried, the double-screw conveyor 11 is opened, and the wet sludge is conveyed to the conveying pipeline 22 through the sludge conveying pump.
And a semi-dry sludge feeding device 6 is arranged between the feed opening of the scraper conveyor 12 and the feed opening of the semi-dry sludge forming machine 3. As shown in fig. 5, the semi-dry sludge feeding device 6 includes a feeding trough 61 and a paving unit 62, a feed opening of the scraper conveyor 12 is located above the feeding trough 61, the paving unit 62 is in transmission connection with two side walls of the feeding trough 61, and the paving unit 62 reciprocates along the side walls of the feeding trough 61; in addition, a charging groove discharge port 63 is also arranged below the side wall of the charging groove 61. In this embodiment, a chain wheel 612 is disposed on a wall of the feeding chute 61, the chain wheel 612 is driven by a motor, and the paving unit 62 is in transmission connection with the chain wheel 612 to realize reciprocating motion of the paving unit on the U-shaped feeding chute 61. In order to enhance the stability of the movement of the paving unit 62, in this embodiment, slide rails 611 are further disposed on two side walls of the feeding groove 61, and a slide block is disposed on the paving unit 62, and the slide block and the slide rails 611 are matched with each other, so that the paving unit 62 can move on the feeding groove 61 more stably. The bottom of the feeding groove 61 is further provided with a grid-shaped forming plate 66, and a blank part of the grid is arranged at a position close to the discharge port 63 of the feeding groove, as shown in fig. 6, so that the sludge discharged from the discharge port 63 of the feeding groove is rectangular sludge pieces.
As shown in fig. 5, unit 62 paves includes supporting part 621 and the portion 622 that paves, supporting part 621 sets up in the top of throwing two lateral walls of silo 61 and with throw silo 61 lateral wall transmission and be connected, is provided with the portion 622 that paves between the supporting part 621, the portion 622 that paves is located throws the silo 61, the portion 622 that paves includes from last a plurality of that sets up extremely down the subassembly that paves, first subassembly 625, second subassembly 626 and the third subassembly 627 that paves like this embodiment, the subassembly that paves all includes paver one and paver two, and paver one and paver two top are connected and are formed the triangle-shaped structure.
The outer side of the supporting portion 621 is provided with a first connecting plate 623, and the inner side of the first connecting plate 623 is provided with a slider, and the slider is matched with the sliding rail 611 on the side wall of the feeding groove 61. The inboard of supporting part 621 is provided with second connecting plate 624, be provided with the subassembly that paves on the second connecting plate 624, the direction of motion of the subassembly that paves and supporting part 621 is perpendicular, and first subassembly 625 that paves corresponds the setting from top to bottom with second subassembly 626 that paves, and third subassembly 627 and the second subassembly 626 dislocation set that paves, and the third subassembly 627 that paves is located the outside of second subassembly 626 that paves, as shown in fig. 7. The arrangement of the paving component can ensure that the semi-dry sludge is paved more uniformly.
The semi-dry sludge forming machine 3 is arranged below the semi-dry sludge feeding device 6, the semi-dry sludge forming machine 3 comprises a box body and compression rollers 31 which are arranged in the box body in pairs, the compression rollers 31 are driven by a driving unit, a supporting base is arranged at the tail end of each compression roller 31, and the driving unit is arranged on each supporting base. A doctor mechanism 32 is provided below the pressure roller 31, and the doctor mechanism 32 may be of the prior art. Like scraper mechanism 32 in this embodiment adoption utility model patent with grant publication number CN215743297U, scraper mechanism 32 is used for striking off the mud of adhesion on compression roller 31, as shown in FIGS. 8 and 9, scraper mechanism 32 includes mounting panel 321, articulates a plurality of scrapers 322 on mounting panel 321, mounting panel 321 sets up on the box, scraper 322 supports on compression roller 31, scraper 322 with still be provided with extension spring 323 between the mounting panel 321. Scraper 322 is when specifically installing, and a plurality of stoppers 324 have been laid at the interval on the mounting panel 321, and is a plurality of wear to be equipped with hinge rod 325 between the stopper 324, hinge rod 325 both ends are pegged graft and are had the spacer pin in order to prevent to hinge rod 325 drop. Threaded connection has adjusting rod 326 on the mounting panel 321 between two adjacent stoppers 324, and adjusting rod 326 is the screw rod structure, adjusting rod 326 is located stopper 324 top, and passes mounting panel 321, and threaded connection has lock nut in order fixed on adjusting rod 326, the elasticity of adjustable scraper 322 through adjusting rod 326. The scraper 322 is arranged on the hinged rod 325 between the two adjacent limit blocks 324, the tension spring 323 is arranged between the middle part of the scraper 322 and the adjusting rod 326, and one end of the scraper 322 bends upwards in an arc shape and is tightly attached to the bottom of the press roller 31. Under extension spring 323's effect, scraper 322 tightly supports in the compression roller 31 bottom, and scraper 322 can produce wearing and tearing with compression roller 31 bottom contact for a long time, under extension spring 323's taut effect, guarantees constantly that scraper 322 hugs closely compression roller 31, guarantees to scrape the effect, does benefit to and improves mud shaping effect, has solved scraper 322 fixed structure, uses for a long time to produce wearing and tearing, produces the clearance with compression roller 31 bottom, loses the problem of scraping the effect.
The sludge conveyed by the scraper conveyor 12 is uniformly conveyed to a feeding port of the semi-dry sludge forming machine 3 through the semi-dry sludge feeding device 6. The method comprises the following specific steps:
semi-dry sludge conveyed by the scraper conveyor 12 enters the feeding groove 61 through a discharging opening of the scraper conveyor 12, the paving unit 62 arranged on the feeding groove 61 reciprocates on the side wall of the feeding groove 61, and the triangular structure of the paving component enables the paving unit 62 to push the sludge in the feeding groove 61 forwards and backwards when the paving unit reciprocates, so that the sludge is not gathered at the same point of the feeding groove 61, and the pressure of the paving unit 62 on the sludge in the paving process enables the sludge to be discharged in a rectangular sheet shape from a blank part of a grid at a discharging opening 63 of the feeding groove, and the sludge is discharged to the semi-dry sludge forming machine 3.
The semi-dry sludge forming machine 3 is used for reducing the fluidity of the semi-dry sludge and enabling the sludge to have ideal volume and surface area ratio so as to be beneficial to drying the sludge at the later stage. The semidry sludge to be treated is uniformly input into the whole width of a feed inlet of the semidry sludge forming machine 3 in a rectangular sheet shape, the sludge is extruded to pass through concave-convex gaps of the press rolls 31 to form noodle-shaped sludge, and the noodle-shaped sludge is naturally broken and falls into a conveyor belt of the belt type drying machine 5, so that the semidry sludge forming is completed. In addition, the scraper mechanism 32 can also scrape off the sludge adhered to the press roller 31, and the cleaning of the press roller 31 is completed.
As shown in fig. 10 and 11, the wet sludge forming machine 4 includes a sludge distributor and a wet noodle maker body, the sludge distributor is provided with a sludge pump, the sludge distributor includes a [ "shaped first distribution pipe 41 and a linear section type second distribution pipe 42 connected with the first distribution pipe 41, the second distribution pipe 42 is connected with the wet noodle maker body through a flexible connection pipe 43, the wet noodle maker body includes a preforming zone and a forming zone, the preforming zone includes a stirring bin 44, a stirring roller 45 is arranged in the stirring bin 44, the forming zone is below the stirring roller 45, the forming zone includes a forming groove 46, the forming groove 46 is located at the bottom of the stirring bin 44, the bottom of the forming groove 46 is provided with a forming hole 47, the forming hole 47 includes a straight hole section and a circular truncated cone-shaped hole section with a diameter gradually decreasing from top to bottom, so as to form wet sludge; in this embodiment, the circular truncated cone shaped hole section at the lower part of the forming hole 47 extends out of the bottom of the forming groove 46.
The wet sludge former 4 is used for pasty sludge (sludge having a water content of 80% to 85%) to reduce the fluidity of the sludge and to obtain an ideal volume and surface area ratio. Can ensure that the sludge noodles are uniformly accumulated on the conveyer belt when the sludge is dried in the later period. The sludge pump provides a pressure of 6 to 10bar and feeds the sludge into the second distribution pipe 42 through the first distribution pipe 41. The sludge in the second distribution pipe 42 is inputted into the body of the wet noodle maker through several sets of flexible connection pipes 43, and then extruded through the preforming section and the forming section to form the noodles. The formed noodle-shaped sludge is naturally fractured. When the forming holes 47 become blocked, the line pressure rises and the system alarms, informing the operator to shut down the wet sludge forming machine 4.
As shown in fig. 12 and 13, the belt type dryer 5 includes a dryer chamber 50, a sludge feeding opening is arranged above the dryer chamber 50, the sludge feeding opening is located below a discharge port of the wet sludge forming machine 4 and a discharge port of the semi-dry sludge forming machine 3, a sludge discharge port is arranged at the bottom of the dryer chamber 50, an upper conveyor belt 56 and a lower conveyor belt 57 are arranged in the dryer chamber 50, the upper conveyor belt 56 and the lower conveyor belt 57 are driven by sprockets, the upper conveyor belt 56 and the lower conveyor belt 57 are arranged in parallel and in a staggered manner, the moving directions of the two are opposite, the front end of the upper conveyor belt 56 is located below the sludge feeding opening, the tail end of the upper conveyor belt 56 is located above the lower conveyor belt 57, the arrangement is such that the upper conveyor belt 56 can receive noodle-shaped sludge from the wet sludge forming machine 4 and the semi-dry sludge forming machine 3, and the upper conveyor belt 56 can convey the sludge onto the lower conveyor belt 57 for further drying. The sludge discharge port is located at the end of the lower conveyor belt 57. The upper conveyor belt 56 and the lower conveyor belt 57 are provided with air holes, and in this embodiment, the upper conveyor belt 56 and the lower conveyor belt 57 are 304 stainless steel plates with elongated holes. The air vents provide uniform air flow to the sludge on the conveyor belt. The belt dryer 5 provides a smooth transport condition for the sludge, whereby dust can be kept to a minimum by avoiding friction between materials.
The drying zone of the belt dryer 5 is divided into 5 drying modules: a first drying chamber 51, a second drying chamber 52, a third drying chamber 53, a fourth drying chamber 54 and a fifth drying chamber 55, in each of which a drying gas flow passes through the sludge.
Strip-shaped sludge (the diameter is about 8 mm) from the wet sludge forming machine 4 or the semi-dry sludge forming machine 3 falls into the upper conveyor belt 56, the upper conveyor belt 56 moves, the sludge on the upper conveyor belt is conveyed to the tail end of the upper conveyor belt 56, then the sludge is turned over and falls onto the lower conveyor belt 57, in the process, the belt type drier 5 heats air by using a heat source provided by a burner or a hot blast stove 9, the hot blast evaporates the moisture in the sludge, and finally dry sludge with the moisture content of less than or equal to 15% is produced. The wet sludge forming machine 5 and the semi-dry sludge forming machine 3 improve the volume and the surface area ratio of the sludge, increase the contact area of hot air and the sludge, improve the permeability of the sludge and ensure the evaporation water quantity.
The upper conveyor belt 56 of the belt drier 5 transports the sludge through the 5 drying chambers at a speed of about 1 m/min (which can be adjusted by variable-frequency speed regulation). The sludge in the first pass through the five drying chambers reaches partial drying with a humidity of about 50%. At the same time, the drying temperature is gradually raised from 80 ℃ to 110 ℃ from the first drying chamber 51 to the fifth drying chamber 55, the sludge stays on the upper conveyor 56 for about 30 minutes and then falls onto the lower conveyor 57 and is conveyed from the fifth drying chamber 55 to the first drying chamber 51, and the dried sludge can be cooled down while passing through the second drying chamber 52 to the first drying chamber 51. In addition, the aim of more reasonably using energy in the drying process can be fulfilled by the method. Plus the residence time on the lower conveyor 57, the overall residence time is approximately 70 minutes or so.
An exhaust gas outlet of the belt type drying machine 5 is sequentially connected with an air-air heat exchanger 81 and an exhaust gas treatment unit 82. The waste gas treatment unit 82 is a PPCP desulfurization and denitrification system. In addition, the belt type drying machine 5 is also provided with a waste gas blower, a part of circulating air in the belt type drying machine is discharged through the waste gas blower to keep the air pressure in the system to be micro negative pressure, so that the gas is prevented from overflowing, and the discharged air can reach the standard after entering the biological filter for treatment. The belt type drying machine 5 is internally provided with a spraying system, in particular, movable branch pipes are respectively arranged above the upper conveying belt 56 and the lower conveying belt 57 every two meters, and each branch pipe is provided with 5 nozzles. The nozzle covers the entire bandwidth.
And a sludge discharge port of the belt type drier 5 is connected with a dry sludge cooling conveyor 10 for conveying dry sludge to a downstream treatment system. In this embodiment, the downstream processing system is sludge granulation, so the dry sludge is delivered to the dry sludge bin 0 by the cooling conveyor 10, the inclined conveyor and the five-axis screw conveyor.
As shown in fig. 14, the process for sludge drying by using the sludge forming belt drying system specifically comprises the following steps:
(1) conveying the sludge with different water contents to a semi-dry sludge bin 1 or a wet sludge bin 2:
conveying sludge with the water content of 80-85% to a wet sludge bin 2, and conveying semi-dry sludge with the water content of 50-70% to a semi-dry sludge bin 1;
(2) forming sludge:
conveying sludge in a wet sludge bin 2 into a wet sludge forming machine 4 above a belt type drying machine 5 through a sludge conveying pump for forming;
conveying sludge in a semi-dry sludge bin 1 to the position above a belt type drier 5 through a scraper conveyor 12 at the bottom of the semi-dry sludge bin, and then feeding the sludge into a semi-dry sludge forming machine 3 through a semi-dry sludge feeding device 6 for forming;
(3) sludge drying:
the wet sludge forming machine 4 and the semi-dry sludge forming machine 3 extrude surface strip-shaped sludge to enter the belt type drier 5 through a sludge feeding opening above the drier chamber 50, and the surface strip-shaped sludge is evenly spread on an upper conveying belt 56 of the belt type drier 5, and hot air in the drier chamber 50 of the belt type drier 5 penetrates through the upper conveying belt 56 and a lower conveying belt 57 to dry the sludge. The dry sludge at the sludge discharge at the end of the lower conveyor 57 falls into the sludge cooling conveyor 10 and is then conveyed to a downstream processing system, such as a dry sludge silo 0 via a bucket elevator and belt. In addition, the gas after heat exchange of the belt drier 5 is treated by a desulfurization and PPCP flue gas treatment system and then is discharged after reaching the standard.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.
Claims (10)
1. A sludge forming belt type drying system is characterized by comprising a sludge bin, a sludge forming machine and a belt type drying machine which are sequentially arranged; the sludge storage bin comprises a semi-dry sludge storage bin (1) and a wet sludge storage bin (2), the sludge forming machine comprises a semi-dry sludge forming machine (3) and a wet sludge forming machine (4), the semi-dry sludge storage bin (1) is connected with the semi-dry sludge forming machine (3) through a scraper conveyor (12), the wet sludge storage bin (2) is connected with the wet sludge forming machine (4) through a conveying pipeline (22), and a sludge conveying pump is arranged on the conveying pipeline (22); the discharge port of the wet sludge forming machine (4) and the discharge port of the semi-dry sludge forming machine (3) are positioned above the conveyor belt of the belt type drier (5); the sludge discharge port of the belt drier (5) conveys the dried sludge to a downstream treatment system through a discharge conveying system, and the waste gas outlet of the belt drier (5) is sequentially connected with an air-air heat exchanger (81) and a waste gas treatment unit (82).
2. The sludge forming belt drying system according to claim 1, wherein a semi-dry sludge feeding port is arranged above the semi-dry sludge bin (1), a grid is arranged at the semi-dry sludge feeding port, a bin cover (7) is arranged above the grid, the bin cover (7) is driven by a hydraulic rod, a carriage system is arranged in the semi-dry sludge bin (1), the carriage is driven by a hydraulic station (18) outside the semi-dry sludge bin (1), a spiral conveyor (11) is arranged below the carriage, a semi-dry sludge discharging port is arranged at the tail end of the semi-dry sludge bin (1) corresponding to the spiral conveyor (11), and a scraper conveyor (12) is arranged at the semi-dry sludge discharging port;
the carriage comprises a slide bar (13), and the hydraulic station (18) drives the slide bar (13) to realize the reciprocating sliding of the carriage; a front supporting plate (14) and a rear supporting plate (15) are arranged on the sliding rod (13), a gap is reserved between the front supporting plate (14) and the rear supporting plate (15), and a spiral conveyor (11) of the semi-dry sludge bin (1) is arranged below the gap; the front supporting plate (14) is provided with a front push plate (16) which inclines towards the direction of the hydraulic station (18), and the rear supporting plate (15) is provided with a rear push plate (16) which inclines towards the opposite direction of the hydraulic station (18).
3. The belt-type sludge drying system as claimed in claim 1, wherein a feeding port is arranged above the wet sludge bin (2), a grid is arranged at the feeding port, a bin cover (7) is arranged above the grid, the bin cover (7) is driven by a hydraulic rod, a screw conveyor (11) is arranged in the wet sludge bin (2), the bin side wall on one side of the screw conveyor (11) is a blanking plate (21), the blanking plate (21) is obliquely arranged, a discharging port is arranged at the tail end of the wet sludge bin (2) corresponding to the screw conveyor (11), and a conveying pipeline (22) is arranged at the discharging port.
4. The sludge forming belt drying system as claimed in claim 1, wherein a semi-dry sludge feeding device (6) is arranged between a feed opening of the scraper conveyor (12) and a feed opening of the semi-dry sludge forming machine (3), the semi-dry sludge feeding device (6) comprises a feeding trough (61) and a spreading unit (62), the feed opening of the scraper conveyor (12) is located above the feeding trough (61), the spreading unit (62) is connected to two side walls of the feeding trough (61) in a transmission manner, and a feeding trough discharge opening (63) is further arranged below the side walls of the feeding trough (61).
5. The sludge forming belt drying system as claimed in claim 4, wherein a chain wheel (612) is arranged on the wall of the feeding trough (61), the chain wheel (612) is driven by a motor, and the paving unit (62) is in transmission connection with the chain wheel (612); two side walls of the feeding trough (61) are also provided with slide rails (611), the paving unit (62) is provided with slide blocks, and the slide blocks and the slide rails (611) are matched with each other; the bottom of the feeding groove (61) is also provided with a grid-shaped forming plate (64), and a blank part of the grid is arranged at a position close to a discharge hole (63) of the feeding groove; the unit (62) paves includes supporting part (621) and the portion (622) that paves, supporting part (621) set up in the top of throwing two lateral walls of silo (61) and with throw silo (61) lateral wall transmission and be connected, be provided with between supporting part (621) the portion (622) that paves, the portion (622) that paves is located throws silo (61), the portion (622) that paves includes from last a plurality of that sets up extremely down the subassembly that paves, the subassembly that paves all includes the paving board one and paving board two, and the paving board one and two tops of paving board are connected and are formed the triangle-shaped structure.
6. The sludge forming belt drying system as claimed in claim 5, wherein a first connecting plate (623) is arranged at the outer side of the supporting part (621), a slide block is arranged at the inner side of the first connecting plate (623), and the slide block is matched with the slide rail (611) on the side wall of the feeding trough (61); the inboard of supporting part (621) is provided with second connecting plate (624), be provided with the subassembly that paves on second connecting plate (624), the direction of motion of the subassembly that paves and supporting part (621) is perpendicular, and it sets up or dislocation set to correspond from top to bottom between the subassembly that paves.
7. The sludge forming belt drying system as claimed in claim 1, wherein the wet sludge forming machine (4) comprises a sludge distributor and a wet noodle machine body, the sludge distributor comprises a [ -shaped first distribution pipe (41) and a straight-line-shaped second distribution pipe (42) connected with the first distribution pipe (41), and the second distribution pipe (42) is connected with the wet noodle machine body through a flexible connecting pipe (43).
8. The sludge forming belt drying system as claimed in claim 7, wherein the wet noodle maker body comprises a pre-forming area and a forming area, the pre-forming area comprises a stirring bin (44), a stirring roller (45) is arranged in the stirring bin (44), the forming area is arranged below the stirring roller (45), the forming area comprises a forming groove (46), the forming groove (46) is located at the bottom of the stirring bin (44), a forming hole (47) is formed in the bottom of the forming groove (46), and the forming hole (47) comprises a straight hole section and a circular truncated cone-shaped hole section with a diameter gradually decreasing from top to bottom.
9. The sludge forming belt drying system according to claim 1, wherein the belt dryer (5) comprises a dryer chamber (50), a sludge feeding opening is arranged above the dryer chamber (50), a sludge discharging opening is arranged at the bottom of the dryer chamber, the sludge feeding opening is positioned below a discharging opening of the wet sludge forming machine (4) and a discharging opening of the semi-dry sludge forming machine (3), an upper conveying belt (56) and a lower conveying belt (57) are arranged in the dryer chamber (50), the upper conveying belt (56) and the lower conveying belt (57) are driven by a chain wheel, the upper conveying belt (56) and the lower conveying belt (57) are arranged in parallel and in a staggered manner, the front end of the upper conveying belt (56) is positioned below the sludge feeding opening, and the tail end of the upper conveying belt (56) is positioned above the lower conveying belt (57); the sludge discharge port is positioned at the tail end of the lower conveyor belt (57); air holes are formed in the upper conveying belt (56) and the lower conveying belt (57).
10. The drying process of the sludge forming belt type drying system as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
(1) conveying the sludge to a wet sludge bin (2) or a semi-dry sludge bin (1);
(2) the sludge in the wet sludge bin (2) is conveyed into a wet sludge forming machine (4) through a sludge conveying pump; sludge in the semi-dry sludge bin (1) is conveyed to the upper part of the belt type drier (5) through a scraper conveyor (12) at the bottom of the semi-dry sludge bin, and then enters the semi-dry sludge forming machine (3) through a semi-dry sludge feeding device (6);
(3) the wet sludge forming machine (4) and the semi-dry sludge forming machine (3) extrude surface-strip sludge to be evenly spread on a conveying belt of the belt type drier (5), and the sludge is dried in a chamber (50) of the belt type drier;
(4) then the dry sludge enters a sludge cooling conveyor (10) through a sludge discharge port and is conveyed to a downstream treatment system; the gas after heat exchange in the belt drier (5) is treated by a desulfurization and PPCP flue gas treatment system and then is discharged after reaching the standard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210333505.4A CN114804573A (en) | 2022-03-31 | 2022-03-31 | Sludge forming belt type drying system and drying process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210333505.4A CN114804573A (en) | 2022-03-31 | 2022-03-31 | Sludge forming belt type drying system and drying process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286196A (en) * | 2022-08-23 | 2022-11-04 | 嘉戎技术(北京)有限公司 | Sludge treatment system and treatment method |
| CN117382236A (en) * | 2023-12-08 | 2024-01-12 | 江苏康泰环保股份有限公司 | Sludge spreading and conveying equipment |
-
2022
- 2022-03-31 CN CN202210333505.4A patent/CN114804573A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286196A (en) * | 2022-08-23 | 2022-11-04 | 嘉戎技术(北京)有限公司 | Sludge treatment system and treatment method |
| CN115286196B (en) * | 2022-08-23 | 2024-03-26 | 嘉戎技术(北京)有限公司 | Sludge treatment system and treatment method |
| CN117382236A (en) * | 2023-12-08 | 2024-01-12 | 江苏康泰环保股份有限公司 | Sludge spreading and conveying equipment |
| CN117382236B (en) * | 2023-12-08 | 2024-02-02 | 江苏康泰环保股份有限公司 | Sludge spreading and conveying equipment |
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