CN211367383U - Sludge drying system - Google Patents
Sludge drying system Download PDFInfo
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- CN211367383U CN211367383U CN201921948857.0U CN201921948857U CN211367383U CN 211367383 U CN211367383 U CN 211367383U CN 201921948857 U CN201921948857 U CN 201921948857U CN 211367383 U CN211367383 U CN 211367383U
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Abstract
The utility model discloses a sludge drying system, including indirect drying device, indirect drying device includes sludge flow channel and heat transfer medium runner, still includes: the heat exchange device is connected with the indirect drying device and can receive the heat exchange medium flowing out of the heat exchange medium flow channel so as to heat the heat exchange gas; the preheating device is arranged at the upstream of the indirect drying device and connected with the heat exchange device, and the heated heat exchange gas can preheat sludge in the preheating device. The utility model provides a sludge drying system, its heat transfer device adopt heat transfer gas to retrieve the energy of indirect drying device's heat transfer medium to preheat mud in preheating device through this heat transfer gas, can improve the utilization efficiency of energy by a wide margin, avoid the energy extravagant, can also improve the evaporation effect of moisture.
Description
Technical Field
The utility model relates to a sludge treatment technical field, concretely relates to sludge drying system.
Background
The urban sludge is mainly a floccule body composed of water, organic particles, inorganic particles and the like, wherein a large amount of heavy metals, pathogens and refractory toxic organic matters are contained, odor can be emitted, and if the urban sludge is not treated properly, environmental pollution is easily caused.
At present, sludge treatment modes comprise drying incineration, anaerobic digestion, aerobic fermentation and the like, wherein the drying incineration has the most obvious reduction compared with other treatment modes, is an important mode for realizing sludge reduction, stabilization, harmlessness and recycling, and the dried sludge has the advantages of greatly reduced volume, stable property and convenience in transportation and resource recycling.
The common drying process is an indirect heat drying technology, and a heat medium of the indirect heat drying technology is not in direct contact with sludge, but evaporates moisture in the sludge in an indirect heat exchange mode, however, the heat transfer efficiency of the process is low, and the utilization rate of energy is low.
Therefore, how to provide a solution to overcome the above-mentioned drawbacks remains a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a sludge drying system, its heat transfer device adopt heat transfer gas to retrieve the energy of indirect drying device's heat transfer medium to preheat mud in preheating device through this heat transfer gas, can improve the utilization efficiency of energy by a wide margin, avoid the energy waste, can also improve the evaporation effect of moisture.
In order to solve the technical problem, the utility model provides a sludge drying system, including indirect drying device, indirect drying device includes sludge flow channel and heat transfer medium runner, still includes: the heat exchange device is connected with the indirect drying device and can receive the heat exchange medium flowing out of the heat exchange medium flow channel so as to heat the heat exchange gas; the preheating device is arranged at the upstream of the indirect drying device and connected with the heat exchange device, and the heated heat exchange gas can preheat sludge in the preheating device.
Adopt above-mentioned structure, the embodiment of the utility model provides a set up heat transfer device, can receive the heat transfer medium who flows in the self heat transfer medium runner to heat the heat transfer gas through this heat transfer medium, with the recovery heat, then, can carry out direct heat transfer to mud in letting in preheating device with the heat transfer gas after the heating.
Due to the arrangement, on one hand, the sludge entering the indirect drying device can be preheated to improve the surface temperature of the sludge, the phenomena that the water evaporated from the indirect drying device is secondarily condensed and cannot be discharged due to the lower surface temperature of the sludge can be effectively avoided, the influence of the condensation phenomenon on the drying process can be favorably improved, and the water evaporation efficiency of the indirect drying device can be improved; on the other hand, the heat source of the system can be more fully utilized, the utilization efficiency of the heat source is improved, the energy consumption is reduced, the heat exchange efficiency of the direct heat exchange process adopted by the preheating device is higher, and the heat in the heated heat exchange gas can be more fully utilized.
Optionally, the system further comprises a crushing device, which is arranged between the preheating device and the indirect drying device and is used for crushing the sludge discharged by the preheating device.
Optionally, the heat exchange device is a heat pump, the heat exchange gas is air, and the heat exchange medium is one of steam, hot oil and hot water.
Optionally, the preheating device is a closed conveyor, and an air inlet of the preheating device is arranged at the bottom of the closed conveyor and used for introducing the heated heat exchange gas.
Optionally, the conveying component in the closed conveyor is a mesh belt or a chain plate which runs in an annular mode, and a mud scraping component is arranged at a feed opening of the closed conveyor and used for scraping the returned mud on the surface of the conveying component.
Optionally, the indirect drying device and the air outlet of the preheating device are further connected with a tail gas treatment device for purifying tail gas.
Optionally, the tail gas treatment device comprises a dust remover, a demister and an induced draft fan which are connected in sequence.
Optionally, the demister is further connected with a washing component and a sewage storage component, the washing component is used for washing the inside of the demister, and the sewage storage component is used for storing sewage in the demister.
Optionally, the system also comprises a dry sludge bin, wherein the dry sludge bin is connected with the indirect drying device and the dust remover and is used for storing dried sludge and solid particles collected by the dust remover.
Optionally, the system further comprises a wet sludge bin, and the wet sludge bin conveys wet sludge to the preheating device through a sludge conveying device.
Drawings
Fig. 1 is a schematic structural diagram of a specific embodiment of the sludge drying system provided by the present invention.
The reference numerals in fig. 1 are explained as follows:
1, an indirect drying device;
2, a heat exchange device;
3 preheating device, 31 air inlet, 32 transportation component and 33 mud scraping component;
4, a crushing device;
5, a tail gas treatment device, a 51 dust remover, a 52 demister, a 521 flushing component, a 522 sewage storage component and a 53 induced draft fan;
6, a dry sludge bin;
7 wet sludge bin;
8 sludge conveying device.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sludge drying system according to an embodiment of the present invention.
As shown in fig. 1, the utility model provides a sludge drying system, including indirect drying device 1, be equipped with mud runner and heat transfer medium runner in this indirect drying device 1, mud and heat transfer medium can flow in two runners respectively to carry out non-contact's heat transfer, and then evaporate the moisture in the mud. The structure of the indirect drying device 1 can refer to the prior art, and is not limited herein.
Different from the prior art, the sludge drying system can further comprise: the heat exchange device 2 is connected with the indirect drying device 1, can receive the heat exchange medium flowing out of the heat exchange medium flow channel, and can heat the heat exchange gas through the heat exchange medium; the preheating device 3 is arranged at the upstream of the indirect drying device 1 and connected with the heat exchange device 2, and the heated heat exchange gas can preheat sludge in the preheating device 3.
Adopt above-mentioned structure, the embodiment of the utility model provides a set up heat transfer device 2, can receive the heat transfer medium who flows in the self-heat transfer medium runner to heat the heat transfer gas through this heat transfer medium, with the recovery heat, then, can carry out direct heat transfer to mud in letting in preheating device 3 with the heat transfer gas after the heating.
Due to the arrangement, on one hand, the sludge entering the indirect drying device 1 can be preheated to improve the surface temperature of the sludge, the phenomena that the water evaporated from the indirect drying device 1 is secondarily condensed and cannot be discharged due to the fact that the surface temperature of the sludge is lower can be effectively avoided, the influence of the condensation phenomenon on the drying process can be favorably improved, and the water evaporation efficiency of the indirect drying device 1 can be improved; on the other hand, the heat source of the system can be more fully utilized, the utilization efficiency of the heat source is improved, the energy consumption is reduced, the heat exchange efficiency of the direct heat exchange process adopted by the preheating device 3 is higher, and the heat in the heated heat exchange gas can be more fully utilized.
In addition, when the water content of the sludge is between 50% and 70%, the sludge can go through a stage with very strong plasticity and viscosity, the stage belongs to a sludge viscous zone, the viscosity of the sludge is high at the moment, the flow resistance of the sludge during conveying in a pipeline (conveying in the indirect drying device 1) is very high, and the pumping power consumption is increased.
The embodiment of the utility model provides an adopted preheating device 3 then can avoid foretell mud viscous zone to a great extent to the preheating of mud to reduce the resistance of mud when carrying in indirect mummification device 1, be favorable to reducing the energy consumption.
Specifically, the heat exchanger 2 may be a heat pump, the heat exchange gas may be air that is easily obtained, of course, other gases such as nitrogen may be used, and the heat exchange medium may be steam, hot oil, hot water, or the like.
In the heat pump device, the heat exchange medium discharged by the indirect drying device 1 can be used as a waste heat source, and the temperature of the heat exchange gas can be increased under the action of the circulating refrigerant. For example, taking a heat exchange medium as steam and a heat exchange gas as air as an example, the temperature of the steam condensate discharged by the indirect drying device 1 is usually between 90 ℃ and 100 ℃, and still contains a large amount of waste heat, and after being recovered by a heat pump, the temperature of the heated air can reach 80 ℃ to 90 ℃, so that the waste heat in the steam condensate can be fully recovered and utilized.
Preheating device 3 can be closed conveyer, and its air inlet 31 can set up in the bottom of closed conveyer for leading-in heat transfer gas after the heating, this air inlet 31's quantity can be one, also can be a plurality of, and when being a plurality of, each air inlet 31 can set up at the bottom interval of closed conveyer, in order to guarantee the homogeneity that heat transfer gas after the heating distributes in closed conveyer as far as possible.
Referring to fig. 1, the transportation unit 32 in the closed transportation machine may be a mesh belt or a chain plate which runs in an annular shape, so that the transportation unit 32 itself may have a hollow design, and compared with pipeline transportation, the transportation unit 32 described above can increase the contact area between the heated heat exchange gas and the sludge, and further can improve the preheating effect of the heat exchange gas on the sludge, and can also reduce the transportation power consumption of the sludge. Of course, the transport member 32 may be transported by a general belt or the like without affecting its transport function.
The feed opening of the closed conveyor can be further provided with a mud scraping component 33, the mud scraping component 33 can be specifically a mud scraping plate, a mud scraping knife and the like, can be in contact with the surface of the folded-back conveying component 32 and is used for scraping the mud on the surface of the folded-back conveying component 32, so that the mud can be prevented from falling into the bottom of the closed conveyor and blocking the air inlet 31 to a greater extent, and the conveying of heat exchange gas into the closed conveyor is influenced.
Can know, mud is because reasons such as self viscidity is big, when heat transfer air heats it, inside the evaporation rate of mud surface moisture can be greater than mud, can form the comparatively hard "shell" of one deck on the surface of mud, this "shell" can influence mummification efficiency when mud gets into indirect mummification device 1.
Therefore, the embodiment of the present invention can be further provided with a crushing device 4, the crushing device 4 can be specifically a stirring crushing device, etc., and can be disposed between the preheating device 3 and the indirect drying device 1 for crushing the sludge discharged from the preheating device 3, so as to break the aforementioned "shell", so that the sludge with lower surface water content and the sludge with higher internal water content can be sufficiently mixed, and the "shell" formed in the preheating device 3 can be largely prevented from affecting the drying of the sludge in the indirect drying device 1; moreover, the stirring and crushing process itself can destroy the colloid and the like in the sludge to improve the hydrophobicity of the sludge, which has a positive effect on the drying in the indirect drying device 1.
Further, can also include tail gas processing apparatus 5, this tail gas processing apparatus 5 can link to each other with indirect mummification device 1, preheating device 3's air outlet for carry out purification treatment to indirect mummification device 1, preheating device 3 exhaust tail gas, thereby can avoid sludge drying in-process secondary pollution's production to a great extent.
In detail, this tail gas processing apparatus 5 can be including the dust remover 51, defroster 52 and the draught fan 53 that connect gradually, wherein, the draught fan 53 is used for providing power for the tail gas flow, dust remover 51 can be common dust collecting equipment such as cyclone for the solid particulate matter in the desorption tail gas, defroster 52 can be common defogging equipment such as condenser, labyrinth defroster, be used for the steam in the desorption tail gas, so that carry out subsequent processing to the flue gas, and be favorable to eliminating white smoke plume.
The demister 52 can be further connected with a washing component 521 and a sewage storage component 522, the washing component 521 can wash the interior of the demister 52 by using washing liquid (usually water), so as to largely avoid the harmful substances such as solid particles, aerosol and the like which are not captured by the dust remover 51 in the tail gas from accumulating in the demister 52 and corroding the demister component in the demister 52; the wastewater collected in the demister 52 may flow into the wastewater storage part 522, and the wastewater storage part 522 may be a wastewater tank.
The sludge dried by the indirect drying device 1 and the solid particles collected by the dust collector 51 can be stored in the dry sludge bin 6 so as to be conveniently treated in a centralized manner.
The utility model provides a sludge drying system can also include wet sludge bin 7, and wet sludge bin 7 can set up the upper reaches at preheating device 3, and wet sludge bin 7 can carry wet sludge to preheating device 3 through sludge conveying device 8, and of course, wet sludge bin 7 also can directly link to each other with preheating device 3, and at this moment, sludge conveying device 8 also can not set up. Alternatively, instead of providing the wet sludge storage 7, the wet sludge may be directly conveyed into the preheating device 3 by a sludge conveying device such as an upstream pipeline.
It should be noted that the above-mentioned wet sludge and dry sludge are named only according to the difference of water content, and not to say that the dry sludge contains absolutely no water, the dry sludge in this application actually refers to the dried sludge, and the water content is relatively low.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a sludge drying system, includes indirect drying device (1), indirect drying device (1) includes sludge flow channel and heat transfer medium runner, its characterized in that still includes:
the heat exchange device (2) is connected with the indirect drying device (1) and can receive the heat exchange medium flowing out of the heat exchange medium flow channel so as to heat the heat exchange gas;
the preheating device (3) is arranged at the upstream of the indirect drying device (1) and is connected with the heat exchange device (2), and the heated heat exchange gas can preheat sludge in the preheating device (3).
2. The sludge drying system according to claim 1, further comprising a crushing device (4) disposed between the preheating device (3) and the indirect drying device (1) for crushing the sludge discharged from the preheating device (3).
3. The sludge drying system of claim 1, wherein the heat exchanging device (2) is a heat pump, the heat exchanging gas is air, and the heat exchanging medium is one of steam, hot oil and hot water.
4. The sludge drying system as claimed in any one of the claims 1 to 3, wherein the preheating device (3) is a closed conveyor, and an air inlet (31) of the preheating device is arranged at the bottom of the closed conveyor and used for introducing the heated heat exchange gas.
5. The sludge drying system as claimed in claim 4, wherein the transport component (32) in the closed conveyor is a mesh belt or a chain plate running in an annular shape, and a sludge scraping component (33) is arranged at a feed opening of the closed conveyor and used for scraping the sludge on the surface of the folded transport component (32).
6. The sludge drying system according to claim 4, wherein the air outlets of the indirect drying device (1) and the preheating device (3) are further connected with a tail gas treatment device (5) for purifying tail gas.
7. The sludge drying system as claimed in claim 6, wherein the tail gas treatment device (5) comprises a dust collector (51), a demister (52) and an induced draft fan (53) which are connected in sequence.
8. The sludge drying system as claimed in claim 7, wherein the demister (52) is further connected with a flushing part (521) and a sewage storage part (522), the flushing part (521) is used for flushing the inside of the demister (52), and the sewage storage part (522) is used for storing sewage in the demister (52).
9. The sludge drying system of claim 7, further comprising a dry sludge bin (6) connected to the indirect drying device (1) and the dust collector (51) for storing dried sludge and solid particles collected by the dust collector (51).
10. The sludge drying system as claimed in claim 4, further comprising a wet sludge bin (7), wherein the wet sludge bin (7) conveys wet sludge to the preheating device (3) through a sludge conveying device (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948857.0U CN211367383U (en) | 2019-11-12 | 2019-11-12 | Sludge drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948857.0U CN211367383U (en) | 2019-11-12 | 2019-11-12 | Sludge drying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211367383U true CN211367383U (en) | 2020-08-28 |
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ID=72172370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921948857.0U Active CN211367383U (en) | 2019-11-12 | 2019-11-12 | Sludge drying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211367383U (en) |
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2019
- 2019-11-12 CN CN201921948857.0U patent/CN211367383U/en active Active
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