CN114440623A

CN114440623A - Sludge drying rotary kiln

Info

Publication number: CN114440623A
Application number: CN202210020716.2A
Authority: CN
Inventors: 李刚; 施鹏宇; 何良进
Original assignee: Jiangsu Pengfei Group Co Ltd
Current assignee: Jiangsu Pengfei Group Co Ltd
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2022-05-06
Anticipated expiration: 2042-01-10
Also published as: CN114440623B

Abstract

The application relates to a sludge drying rotary kiln, which comprises a rotary kiln cylinder, a hot flue gas conveying pipeline, a high-temperature flue gas generating device, an anti-sticking wall chain group, a feeding device and a transmission device. The interior of the rotary kiln cylinder is divided into a direct mixing drying section and an indirect contact drying section. One end of the rotary kiln cylinder is provided with a feed inlet and a flue gas outlet cover, and the other end is provided with a discharge cover. The hot flue gas conveying pipeline is arranged on the inner wall of the rotary kiln cylinder and is positioned in the indirect contact drying section. The high-temperature flue gas generating device is arranged on one side of the discharging cover and penetrates through the discharging cover to be connected with the hot flue gas conveying pipeline. The anti-sticking wall chain group is hung on the inner wall of the rotary kiln cylinder and is positioned at the direct mixing and drying section. The feeding device is arranged on one side of the rotary kiln barrel and comprises a bin and a feeding piece, and the feeding piece is arranged below the bin. The transmission device is connected with the rotary kiln cylinder. The sludge drying device is suitable for drying sludge with higher moisture, and has the advantages of good drying effect, high thermal efficiency and low energy consumption.

Description

Sludge drying rotary kiln

Technical Field

The application relates to a rotary kiln, in particular to a sludge drying rotary kiln.

Background

The traditional rotary kiln is mainly used for drying building material chemical materials such as lime powder, cement powder and the like with low water content, poor viscosity and looseness. The materials can be effectively thrown and dispersed in the rotary kiln, and are not easy to agglomerate. The moisture content and the properties of the dewatered sludge produced by the existing municipal sewage treatment plant in China vary with the change of seasons and water plant operating parameters, and the moisture content is high and the variation range is large (75% -85%), so that the sludge forms lumps in the rotary kiln and rolls, can not be well dispersed, and finally is bonded into large lumps of sludge, the drying effect of the rotary kiln on the sludge is seriously influenced, and the rotary kiln is low in heat efficiency and high in energy consumption.

Disclosure of Invention

The embodiment of the application provides a sludge drying rotary kiln, and solves the problems that the sludge is poor in dispersing effect in the existing rotary kiln, the heat efficiency of the rotary kiln is low, and the energy consumption is high.

In order to solve the above technical problem, the present application is implemented as follows:

in a first aspect, a sludge drying rotary kiln is provided, which includes: the rotary kiln comprises a rotary kiln cylinder, a hot flue gas conveying pipeline, a high-temperature flue gas generating device, an anti-sticking wall chain group, a feeding device and a transmission device. The rotary kiln comprises a rotary kiln body and is characterized in that the inside of the rotary kiln body is divided into a direct mixing and drying section and an indirect contact drying section, a feed port and a flue gas outlet cover are arranged at one end, close to the direct mixing and drying section, of the rotary kiln body, and a discharge cover is arranged at the other end of the rotary kiln body. The hot flue gas conveying pipeline is arranged on the inner wall of the rotary kiln cylinder and is positioned in the indirect contact drying section, and a flue outlet of the hot flue gas conveying pipeline faces the direct mixing drying section.

Bearing above, high temperature flue gas generating device sets up in one side of ejection of compact cover, and high temperature flue gas generating device passes ejection of compact cover and is connected with hot flue gas pipeline. The anti-sticking wall chain group is hung on the inner wall of the rotary kiln cylinder and is positioned at the direct mixing and drying section. The feeding device is arranged on one side of the rotary kiln cylinder. Feed arrangement includes feed bin and pay-off piece, and the pay-off piece sets up in the below of feed bin and corresponds with the feed inlet, and the feed bin is used for holding dress mud, and the pay-off piece can be sent into the rotary kiln barrel with mud through the feed inlet. And the transmission device is connected with the rotary kiln barrel and is used for driving the rotary kiln barrel to rotate.

In a first possible implementation manner of the first aspect, the feed inlet is provided with a spiral feed channel which is inclined downwards.

In a second possible implementation manner of the first aspect, the hot flue gas conveying pipeline includes a plurality of straight pipelines and a spiral pipeline, one ends of the plurality of straight pipelines are connected with one ends of the spiral pipeline, the other ends of the plurality of straight pipelines face the direct mixing and drying section, and the other ends of the spiral pipeline are connected with the high-temperature flue gas generating device.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the hot flue gas conveying pipeline further includes a connection channel and a plurality of rolling balls, the connection channel is connected to the other ends of the plurality of straight pipelines, the connection channel has a flue outlet corresponding to each straight pipeline, the plurality of rolling balls are disposed in the connection channel, and when the flue outlet rotates to the lower side of the rotary kiln barrel, the rolling balls roll to the position of the flue outlet to seal the flue outlet.

In a fourth possible implementation manner of the first aspect, the high-temperature flue gas generation device includes a combustor and a high-temperature flue gas generator, a flue outlet of the combustor is located in the high-temperature flue gas generator, and a flue outlet of the high-temperature flue gas generator is connected with the hot flue gas conveying pipeline.

In a fifth possible implementation manner of the first aspect, the anti-sticking wall chain set comprises a plurality of chains, each chain is suspended on the inner wall of the rotary kiln cylinder along the axial direction of the rotary kiln cylinder, and each chain is slack.

In a sixth possible implementation manner of the first aspect, the transmission device includes a driving member and a gearwheel, the gearwheel is sleeved on the rotary kiln cylinder and connected with the rotary kiln cylinder, and the driving member is connected with the gearwheel.

In a seventh possible implementation manner of the first aspect, the feeding member includes a feeding belt and a hopper, the feeding belt is disposed below the storage bin, an upper end of the hopper corresponds to a conveying end of the feeding belt, and a lower end of the hopper corresponds to the feeding port.

With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the feeding member further includes a material bearing table and a push rod feeder, the material bearing table is disposed below the hopper and corresponds to the feed port, and the push rod feeder is disposed on a side of the material bearing table away from the feed port.

In a ninth possible implementation manner of the first aspect, the method further includes: and the scraper discharging machine is arranged below the discharging cover.

Compared with the prior art, the application has the advantages that:

the application discloses sludge drying rotary kiln when in the direct mixing mummification section, mud and hot flue gas direct contact, stoving, antiseized wall chain group turns to mud simultaneously, makes mud and hot flue gas fully contact, improves mummification dewatering efficiency. In the indirect contact drying section, the hot flue gas indirectly contacts and dries the sludge through the outer wall of the hot flue gas conveying pipeline, so that the sludge can be dried efficiently and with low energy consumption. The application is suitable for drying the sludge with higher moisture, the drying effect is good, and the rotary kiln has high thermal efficiency and low energy consumption.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic view of a sludge drying rotary kiln according to an embodiment of the present application;

FIG. 2 is a schematic view of a portion of a sludge drying rotary kiln according to an embodiment of the present application;

fig. 3 and 4 are schematic views showing two states of the connecting passage and the rolling ball according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 and 2, fig. 1 is a schematic view of a sludge drying rotary kiln according to an embodiment of the present application, and fig. 2 is a partial schematic view of the sludge drying rotary kiln according to the embodiment of the present application. As shown in the figure, the sludge drying rotary kiln 1 comprises a rotary kiln cylinder 2, a hot flue gas conveying pipeline 3, a high-temperature flue gas generating device 4, an anti-sticking wall chain group 5, a feeding device 6 and a transmission device 7. The interior of the rotary kiln cylinder 2 is divided into a direct mixing drying section 201 and an indirect contact drying section 202. Specifically, as shown in fig. 2, the rotary kiln cylinder 2 is inclined from left to right, the direct mixing and drying section 201 is located on the left side inside the rotary kiln cylinder 2, the indirect contact drying section 202 is located on the right side inside the rotary kiln cylinder 2, in the direct mixing and drying section 201, hot flue gas and sludge are directly contacted and dried, and in the indirect contact drying section 202, hot flue gas and sludge are indirectly contacted and dried.

Bearing on the above, one end of the rotary kiln barrel 2 near the direct mixing and drying section 201 is provided with a feed inlet 21 and a flue gas outlet hood 22. The other end of the rotary kiln cylinder body 2 is provided with a discharging cover 23. Specifically, as shown in fig. 2, the feed inlet 21 and the flue gas outlet hood 22 are located at the left end of the rotary kiln barrel 2, the discharge hood 23 is located at the right end of the rotary kiln barrel 2, sludge can enter the rotary kiln barrel 2/direct mixing and drying section 201 through the feed inlet 21, the sludge is discharged through the discharge hood 23 after being dried, and meanwhile, hot flue gas during drying is discharged through the discharge hood 23. In this embodiment, the feed port 21 is provided with a downward inclined spiral feed channel 211 to facilitate the sludge to enter the rotary kiln barrel 2, but not limited thereto.

Referring back to fig. 2, the hot flue gas delivery pipe 3 is disposed on the inner wall of the rotary kiln cylinder 2 and rotates together with the rotary kiln cylinder 2. The hot flue gas conveying pipeline 3 is positioned in the indirect contact drying section 202, so that in the indirect contact drying section 202, hot flue gas runs through the hot flue gas conveying pipeline 3, and sludge is subjected to indirect contact drying and drying through the outer wall of the hot flue gas conveying pipeline 3. The smoke outlet of the hot smoke conveying pipeline 3 faces the direct mixing and drying section 201, and the hot smoke is discharged into the direct mixing and drying section 201 to be in direct contact with the sludge and dried.

Referring back to fig. 2, the high temperature flue gas generating device 4 is disposed at one side of the discharging cover 23, and the high temperature flue gas generating device 4 passes through the discharging cover 23 and is connected to the hot flue gas conveying pipe 3. In the present embodiment, the high temperature flue gas generating device 4 comprises a burner 41 and a high temperature flue gas generator 42, wherein the flue outlet of the burner 41 is located in the high temperature flue gas generator 42, and the flue outlet of the high temperature flue gas generator 42 is connected with the hot flue gas conveying pipeline 3. Specifically, as shown in fig. 2, the high-temperature flue gas generator 42 is located in the rotary kiln cylinder 2, the left end of the high-temperature flue gas generator 42 is connected to the hot flue gas conveying pipe 3, the right end of the high-temperature flue gas generator 42 is aligned with the discharging cover 23, the burner 41 is located on the right side of the discharging cover 23, the flue outlet of the burner 41 extends into the high-temperature flue gas generator 42, the burner 41 generates hot flue gas, and the hot flue gas enters the hot flue gas conveying pipe 3 through the high-temperature flue gas generator 42, so that the hot flue gas is provided for the rotary kiln cylinder 2.

Referring back to fig. 2, the anti-sticking chain set 5 is suspended on the inner wall of the rotary kiln cylinder 2 and is located in the direct mixing and drying section 201. In the present embodiment, the anti-sticking chain set 5 includes a plurality of chains 51, each chain 51 is suspended on the inner wall of the rotary kiln cylinder 2 along the axial direction thereof, and each chain 51 is loose. When the chain 51 rotates to the upper half position along with the rotary kiln cylinder 2, the chain 51 is in a suspension state; when chain 51 rotates to half position down along with rotary kiln barrel 2, chain 51 is the state of lying, so realize that chain 51 stirs mud along with rotary kiln barrel 2 is rotatory, make mud and hot flue gas fully contact, improve mummification dewatering efficiency, can also avoid simultaneously that mud glues wall, caking phenomenon to take place.

Referring back to fig. 1 and 2, the feeding device 6 is disposed on one side of the rotary kiln cylinder 2, and as shown in fig. 1, the feeding device 6 is located on the left side of the rotary kiln cylinder 2. The feeding device 6 comprises a bin 61 and a feeding piece 62, wherein the feeding piece 62 is arranged below the bin 61 and corresponds to the feeding hole 21. The sludge is loaded in the storage bin 61, the sludge falls onto the feeding piece 62 through the outlet below the storage bin 61, and the feeding piece 62 feeds the sludge into the rotary kiln cylinder 2 through the feeding hole 21, so that the automatic feeding function is realized.

Referring back to fig. 2, the transmission device 7 is connected with the rotary kiln body 2. The transmission device 7 is used for driving the rotary kiln barrel 2 to rotate, the rotating speed of the rotary kiln barrel 2 can be optimally designed according to the moisture content of sludge and the discharging speed, and the rotating speed can be regulated and controlled through a corresponding control system. In this embodiment, the transmission device 7 includes a driving member (not shown in the figure) and a large gear 71, the large gear 71 is sleeved on the rotary kiln body 2 and connected to the driving member, and the driving member is connected to the large gear 71. The driving piece drives the rotary kiln barrel 2 to rotate through the large gear 71. The driving member uses a combination structure of a driving motor, a gear box and a pinion gear, but is not limited thereto.

When the sludge drying rotary kiln 1 is used, the transmission device 7 drives the rotary kiln cylinder 2 to rotate, the feeding piece 62 feeds sludge into the rotary kiln cylinder 2 through the feeding port 21, the sludge rolls from left to right along with the rotation of the rotary kiln cylinder 2, the high-temperature flue gas generating device 4 provides hot flue gas, and the hot flue gas enters the direct mixing and drying section 201 through the hot flue gas conveying pipeline 3. When the sludge is in the direct mixing and drying section 201, the sludge is directly contacted and dried with the hot flue gas, and meanwhile, the anti-sticking wall chain group 5 turns over the sludge, so that the sludge is fully contacted with the hot flue gas, and the drying and dewatering efficiency is improved. Meanwhile, the hot flue gas after the sludge drying is discharged through the gas outlet cover 22.

Bearing on, along with rotary kiln barrel 2 is rotatory, mud enters into indirect contact mummification section 202 back by direct mixing mummification section 201, and mud and hot flue gas pipeline 3 contact, and the hot flue gas is through the outer wall of hot flue gas pipeline 3 to mud indirect contact mummification, stoving to at the rotatory thrust effect that produces of spiral, push mud to rotary kiln barrel 2's discharge end, discharge after the ejection of compact cover 23 collection, so can realize the mummification mud of high efficiency, low energy consumption.

In an embodiment, referring to fig. 1 again, the sludge drying rotary kiln 1 further includes a scraper discharger 8, and the scraper discharger 8 is disposed below the discharge cover 23. The scraper discharging machine 8 is used for collecting the sludge which is discharged by the discharging cover 23 and subjected to drying treatment so as to carry out the next procedure or collect the sludge for later use. As regards the choice of the construction of the blade discharger 8, the application may have no particular requirements for this, as is conventional for the person skilled in the art.

The structure of the hot flue gas conveying pipe 3 and the feeder piece 62 is explained below. Referring back to fig. 2, the hot flue gas conveying pipeline 3 includes a plurality of straight pipelines 31 and a spiral pipeline 32, one end of each of the straight pipelines 31 is connected with one end of the spiral pipeline 32, the other end of each of the straight pipelines 31 faces the direct mixing and drying section 201, and the other end of the spiral pipeline 32 is connected with the high-temperature flue gas generating device 4. Specifically, the plurality of straight pipelines 31 are located on the left side of the hot flue gas conveying pipeline 3, the spiral pipeline 32 is located on the right side of the hot flue gas conveying pipeline 3, and the hot flue gas enters the direct mixing and drying section 201 through the spiral pipeline 32 and the plurality of straight pipelines 31 in sequence.

Referring to fig. 3 and 4 together with fig. 1, fig. 3 and 4 are schematic views illustrating two states of a connecting channel and a rolling ball according to an embodiment of the present application. As shown, the hot flue gas duct 3 further comprises a connecting channel 33 and a plurality of rolling balls 34. The connection passage 33 is connected to the other ends of the plurality of flat tubes 31, and the connection passage 33 has a smoke outlet 331 corresponding to each flat tube 31. A plurality of rolling balls 34 are provided in the connecting passage 33, and the rolling balls 34 can freely roll in the connecting passage 33. When the smoke outlet 331 rotates to the lower part of the rotary kiln barrel 2, as shown in fig. 3, the rolling ball 34 rolls to the smoke outlet to seal the smoke outlet, so as to prevent the sludge from entering the hot smoke conveying pipeline 3, when the smoke outlet 331 rotates to the upper part/upper part of the rotary kiln barrel 2, the rolling ball 34 rolls downwards, the smoke outlet 331 is opened, and the hot smoke enters the direct mixing and drying section 201 through the smoke outlet 331. Preferably, the end of the smoke outlet 331 is provided with a necking to prevent the rolling ball 34 from falling off from the connecting channel 33 when moving to the lower part, but not limited thereto.

Referring back to fig. 1, the feeding member 62 includes a feeding belt 621 and a hopper 622. The feeding belt 621 is disposed below the bin 61, the upper end of the hopper 622 corresponds to the conveying end of the feeding belt 621, and the lower end of the hopper 622 corresponds to the feeding port 21. In this embodiment, the feeding member 62 further includes a material supporting platform 623 and a push rod feeder 624, the material supporting platform 623 is disposed below the hopper 622 and corresponds to the feeding port 21, and the push rod feeder 624 is disposed on a side of the material supporting platform 623 away from the feeding port 21. The sludge falls onto the feeding belt 621 through the outlet below the bin 61, and along with the rotation of the feeding belt 621, the sludge falls into the hopper 622 and falls onto the material bearing table 623 through the hopper 622, and the push rod feeder 624 pushes the sludge into the feeding hole 21 and then enters the rotary kiln barrel 2 through the feeding hole 21.

To sum up, this application provides a sludge drying rotary kiln, when directly mixing the mummification section, mud and hot flue gas direct contact, stoving, simultaneously antiseized wall chain group turns to mud, makes mud and hot flue gas fully contact, improves mummification dewatering efficiency. In the indirect contact drying section, the hot flue gas indirectly contacts and dries the sludge through the outer wall of the hot flue gas conveying pipeline, so that the sludge can be dried efficiently and with low energy consumption. The application is suitable for drying the sludge with higher moisture, the drying effect is good, and the rotary kiln has high thermal efficiency and low energy consumption.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.

Claims

1. A sludge drying rotary kiln is characterized by comprising:

the rotary kiln comprises a rotary kiln barrel, a gas inlet cover, a gas outlet cover and a gas outlet cover, wherein the interior of the rotary kiln barrel is divided into a direct mixing drying section and an indirect contact drying section;

the hot flue gas conveying pipeline is arranged on the inner wall of the rotary kiln cylinder and is positioned in the indirect contact drying section, and a flue outlet of the hot flue gas conveying pipeline faces the direct mixing drying section;

the high-temperature flue gas generating device is arranged on one side of the discharging cover and penetrates through the discharging cover to be connected with the hot flue gas conveying pipeline;

the anti-sticking wall chain group is suspended on the inner wall of the rotary kiln cylinder and is positioned at the direct mixing and drying section;

the feeding device is arranged on one side of the rotary kiln cylinder and comprises a bin and a feeding piece, the feeding piece is arranged below the bin and corresponds to the feeding hole, the bin is used for containing sludge, and the feeding piece can feed the sludge into the rotary kiln cylinder through the feeding hole;

and the transmission device is connected with the rotary kiln cylinder and is used for driving the rotary kiln cylinder to rotate.

2. The sludge drying rotary kiln according to claim 1, wherein the feed inlet is provided with a downward inclined spiral feed channel.

3. The sludge drying rotary kiln according to claim 1, wherein the hot flue gas delivery pipe comprises a plurality of straight pipes and a spiral pipe, one end of each of the straight pipes is connected with one end of the spiral pipe, the other end of each of the straight pipes faces the direct mixing and drying section, and the other end of each of the spiral pipes is connected with the high-temperature flue gas generating device.

4. The sludge drying rotary kiln according to claim 3, wherein the hot flue gas delivery pipe further comprises a connecting passage and a plurality of rolling balls, the connecting passage is connected with the other ends of the plurality of straight pipes, the connecting passage is provided with the smoke outlet corresponding to each straight pipe, the plurality of rolling balls are arranged in the connecting passage, and when the smoke outlet rotates to the position below the rotary kiln barrel, the rolling balls roll to the position of the smoke outlet to seal the smoke outlet.

5. The sludge drying rotary kiln according to claim 1, wherein the high-temperature flue gas generating device comprises a combustor and a high-temperature flue gas generator, a flue gas outlet of the combustor is located in the high-temperature flue gas generator, and a flue gas outlet of the high-temperature flue gas generator is connected with the hot flue gas conveying pipeline.

6. The sludge drying rotary kiln as claimed in claim 1, wherein the anti-sticking chain set comprises a plurality of chains, each chain is suspended on the inner wall of the rotary kiln barrel along the axial direction of the rotary kiln barrel, and each chain is loose.

7. The sludge drying rotary kiln as claimed in claim 1, wherein the transmission device comprises a driving member and a gearwheel, the gearwheel is sleeved on the rotary kiln body and connected with the driving member, and the driving member is connected with the gearwheel.

8. The sludge drying rotary kiln according to claim 1, wherein the feeding member comprises a feeding belt and a hopper, the feeding belt is arranged below the storage bin, the upper end of the hopper corresponds to the conveying end of the feeding belt, and the lower end of the hopper corresponds to the feeding port.

9. The sludge drying rotary kiln according to claim 8, wherein the feeding member further comprises a material bearing table and a push rod feeder, the material bearing table is arranged below the hopper and corresponds to the feed port, and the push rod feeder is arranged on one side of the material bearing table, which is far away from the feed port.

10. The sludge drying rotary kiln according to claim 1, further comprising: and the scraper discharging machine is arranged below the discharging cover.