CN214060318U - Sludge disc drying system - Google Patents
Sludge disc drying system Download PDFInfo
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- CN214060318U CN214060318U CN202022111035.6U CN202022111035U CN214060318U CN 214060318 U CN214060318 U CN 214060318U CN 202022111035 U CN202022111035 U CN 202022111035U CN 214060318 U CN214060318 U CN 214060318U
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Abstract
The utility model relates to the technical field of sludge treatment, in particular to a sludge disc drying system, which comprises a disc drying machine, wherein the upper part of the disc drying machine is provided with at least two feed inlets, a carrier gas inlet and a carrier gas outlet, the carrier gas outlet is connected with a cyclone separator, the upper part outlet of the cyclone separator is connected with the lower part inlet of a condenser, and the lower part outlet of the condenser is sequentially connected with a wastewater delivery pump and a sewage collecting box; an upper outlet of the condenser is connected with a demister, and a first outlet of the demister is connected with a lower inlet of the condenser; a second outlet of the demister is sequentially connected with the exhaust fan and the carrier gas inlet; an outlet at the lower part of the cyclone separator is connected with a first spiral conveyor, and an outlet of the first spiral conveyor is positioned above the scraper conveyor; an outlet at the lower part of the disc drier is connected with an inlet of the after-cooling device, a solid material outlet of the after-cooling device is positioned above the scraper conveyor, and the scraper conveyor is sequentially connected with the bucket elevator, the second screw conveyor and the dry sludge bin.
Description
Technical Field
The utility model relates to a sludge treatment technical field, the concrete field is a mud disc mummification system.
Background
A sludge disc drying system is a sludge drying form which is widely applied in China at present, and the system output of a traditional disc drying machine is generally 100 t/d-110 t/d (wet sludge with 80% of water content is fed, and wet sludge with 40% of water content is discharged). The air is taken as carrier gas to bring water vapor evaporated from the sludge out of the drier, the water vapor enters the cyclone dust collector and the condenser, the water vapor in the carrier gas is condensed into sewage and then enters the sewage treatment system, and a large amount of non-condensable gas enters the deodorization system or directly enters the boiler for incineration. In the sludge drying process, the volume is expanded and then reduced, so that the heat exchange area and the space at the middle and rear ends of the disc dryer cannot be fully utilized, and the pushing volume of the materials is not uniform. The dried sludge carries certain waste heat to enter a dried sludge conveying and storing system; the system output is low as a whole, the generated odor quantity is large, and the treatment is difficult; the dried sludge carries certain waste heat to dissipate heat naturally, so that the odor is large, and the heat cannot be recovered; sludge dryers run the risk of particle explosion.
A traditional disc drying system enters a horizontal disc type drying processor through a screw feeder, a rotor of the disc type drying processor is a group of hollow discs, and the discs are communicated through a hollow shaft. High-temperature media (steam, hot oil or hot water) circulate in a disc bushing of the dryer, so that all disc walls in the reactor are uniformly and effectively heated. The dewatered sludge flows into the gap between the disc and the stator from one end of the drier, reaches the other end and flows out through a discharge valve at the bottom. In the sludge drying process, the volume is expanded and then reduced, so that the heat exchange area and the space at the middle and rear ends of the disc dryer cannot be fully utilized, and the pushing volume of the materials is not uniform. The process adopts single-point feeding, the volume of the sludge is continuously reduced in the heat transfer process, and the area of the middle and rear sections of the disc is continuously reduced; a large amount of carrier gas generated by the disc drier is directly sent into a next-stage deodorization system after simple condensation treatment, so that the disc drier has larger odor treatment capacity and higher investment and operation cost; the dried sludge has higher discharge temperature and larger odor emission, which causes poorer production environment.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a mud disc mummification system.
In order to achieve the above object, the utility model provides a following technical scheme:
a sludge disc drying system comprises a disc drying machine, wherein the upper part of the disc drying machine is provided with at least two feeding ports, the upper part of the disc drying machine is also provided with a carrier gas inlet and a carrier gas outlet, the carrier gas outlet is connected with a cyclone separator, the upper part outlet of the cyclone separator is connected with the lower part inlet of a condenser, and the lower part outlet of the condenser is sequentially connected with a wastewater delivery pump and a sewage collection box; an upper outlet of the condenser is connected with a demister, and a first outlet of the demister is connected with a lower inlet of the condenser; a second outlet of the demister is sequentially connected with an exhaust fan and a carrier gas inlet;
an outlet at the lower part of the cyclone separator is connected with a first spiral conveyor, and an outlet of the first spiral conveyor is positioned above the scraper conveyor;
an outlet at the lower part of the disc drier is connected with an inlet of a post-cooling device, a solid material outlet of the post-cooling device is positioned above the scraper conveyor, an outlet of the scraper conveyor is connected with an inlet of a bucket elevator, and an outlet of the bucket elevator is sequentially connected with a second screw conveyor and a dry sludge bin;
and a gas outlet of the after-cooling device is connected with an upper inlet of the condenser.
And a pipeline between a second outlet of the demister and the exhaust fan is connected with the nitrogen cylinder.
Wherein, a pipeline between the exhaust fan and the carrier gas inlet is provided with an oxygen content detector.
And an outlet in the middle of the condenser discharges industrial water.
The disc drier is provided with a condensation heat exchange system, steam is introduced into an inlet of the condensation heat exchange system, and an outlet of the condensation heat exchange system is connected with a condensation water tank.
Wherein wet sludge is added through the feed inlet.
Wherein, industrial water is introduced into a cooling water inlet of the after-cooling device.
Wherein the wet sludge is mainly solid waste generated in sewage treatment, and a small part of wet sludge is sludge from river channels, oil sludge in petrochemical industry and the like;
recycling the carrier gas: after being discharged, the mixture of air and gas generated by sludge drying is treated and then enters a sludge drying machine.
Post-cooling: and indirectly cooling the dried hot sludge.
The utility model adopts two-point or multi-point feeding, the heating and pushing process of the sludge is more uniform, the heat exchange area of the middle and rear sections of the disc is fully utilized, and the output of the dried sludge is improved; the disc carrier gas pipeline is filled with nitrogen in the initial operation, the condensed carrier gas is demisted and then recycled in the operation, and the carrier gas system is provided with an oxygen content detector for detecting the oxygen content concentration in the carrier gas, so that the carrier gas recycling is realized, and the emission of the odor of the system is greatly reduced; indirectly cooling the dried sludge, reducing the discharge temperature and odor of the dried sludge, and recovering part of heat energy.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model provides two-point or multi-point feeding of the disc drier for the first time, so that the propelling curve of the sludge material is more uniform, the utilization of the heat exchange space and area at the rear end in the disc is improved, and the single machine output of the disc drier is improved;
(2) the measures of demisting by carrier gas, nitrogen filling, explosion prevention and the like in the disc drying system are provided for the first time, so that the recycling of the carrier gas system of the disc drying system is realized, more than 90% of odor emission is eliminated, and the risk of particle explosion in the disc drying machine is greatly reduced;
(3) the cooling screw device reduces the temperature of the dried sludge, recovers a part of heat energy, and reduces the temperature and odor emission of the dried sludge.
(4) The system improves the output of a single disc drier by more than 10 percent; the investment and the operating cost of the tail gas deodorization system are reduced.
Drawings
Fig. 1 is a schematic view of the disc drying system of the present invention.
The system comprises a disc drier 1, a feed inlet 101, a carrier gas inlet 102, a carrier gas outlet 103, a post-cooling device 2, a cyclone separator 3, a first screw conveyor 4, a scraper conveyor 5, a bucket elevator 6, a second screw conveyor 7, a dry sludge bin 8, a condenser 9, a wastewater delivery pump 10, a sewage collection box 11, a nitrogen cylinder 12, a demister 13, an exhaust fan 14 and a condensation water tank 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
a sludge disc drying system comprises a disc drying machine 1, wherein 3 feeding ports 101 are arranged at the upper part of the disc drying machine 1, a carrier gas inlet 102 and a carrier gas outlet 103 are also arranged at the upper part of the disc drying machine 1, the carrier gas outlet 103 is connected with a cyclone separator 3, the upper outlet of the cyclone separator 3 is connected with the lower inlet of a condenser 9, and the lower outlet of the condenser 9 is sequentially connected with a wastewater delivery pump 10 and a sewage collection box 11; an upper outlet of the condenser 9 is connected with a demister 13, and a first outlet of the demister 13 is connected with a lower inlet of the condenser 9; a second outlet of the demister 13 is sequentially connected with the exhaust fan 14 and the carrier gas inlet 102;
the lower outlet of the cyclone separator 3 is connected with a first screw conveyor 4, and the outlet of the first screw conveyor 4 is positioned above a scraper conveyor 5;
an outlet at the lower part of the disc drier 1 is connected with an inlet of the after-cooling device 2, a solid material outlet of the after-cooling device 2 is positioned above the scraper conveyor 5, an outlet of the scraper conveyor 5 is connected with an inlet of the bucket elevator 6, and an outlet of the bucket elevator 6 is sequentially connected with the second screw conveyor 7 and the dry sludge bin 8;
the gas outlet of the after-cooling device 2 is connected with the upper inlet of the condenser 9.
A pipeline between a second outlet of the demister 13 and the exhaust fan 14 is connected to the nitrogen gas cylinder 12. The line between the exhaust fan 14 and the carrier gas inlet 102 is provided with an oxygen content detector.
And an outlet in the middle of the condenser 9 discharges industrial water. The disc drier 1 is provided with a condensation heat exchange system, steam is introduced into an inlet of the condensation heat exchange system, and an outlet of the condensation heat exchange system is connected with a condensation water tank 15. Wet sludge is added through feed port 101. Industrial water is introduced into a cooling water inlet of the after-cooling device 2.
The drying process adopting the sludge disc drying system comprises the following specific steps:
(1) firstly, filling nitrogen into a carrier gas pipeline of the system, reducing the oxygen content of the whole system to about 3-4%, and starting internal circulation of a carrier gas fan;
(2) starting steam admission of the disc drier, and warming the system to a set temperature of 145 ℃;
(3) starting a sludge feeding system, opening a first feeding port to feed sludge for 1-3h, and then opening a second feeding port to feed the sludge in proportion normally and continuously; the weight ratio of the mud amount of the first feed inlet to the mud amount of the second feed inlet is 2: 1-4: 1;
(4) the condensed gas of the sludge evaporation is recycled after demisting the carrier gas, the oxygen content detector is arranged in the carrier gas system to detect the oxygen content concentration in the carrier gas, the oxygen content of the system is not more than 8% (the oxygen content exceeds 8% of the system for alarming, the nitrogen charging system is started until the oxygen content is reduced to about 4%), the carrier gas recycling is realized, and the emission of tail gas is greatly reduced.
(5) The dried sludge is discharged to a cooling spiral for cooling, so that the odor of the dried sludge is reduced.
The system is used for a #9 disc drier of a zhanggang sludge drying project, and compared with a #8 disc drier which does not adopt the system, the system has the following advantages according to operation data:
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A sludge disc drying system is characterized in that: the device comprises a disc drier (1), wherein the upper part of the disc drier (1) is provided with at least two feeding ports (101), the upper part of the disc drier (1) is also provided with a carrier gas inlet (102) and a carrier gas outlet (103), the carrier gas outlet (103) is connected with a cyclone separator (3), the upper outlet of the cyclone separator (3) is connected with the lower inlet of a condenser (9), and the lower outlet of the condenser (9) is sequentially connected with a wastewater delivery pump (10) and a sewage collection box (11); an upper outlet of the condenser (9) is connected with a demister (13), and a first outlet of the demister (13) is connected with a lower inlet of the condenser (9); a second outlet of the demister (13) is sequentially connected with an exhaust fan (14) and a carrier gas inlet (102);
an outlet at the lower part of the cyclone separator (3) is connected with a first spiral conveyor (4), and an outlet of the first spiral conveyor (4) is positioned above the scraper conveyor (5);
an outlet at the lower part of the disc drier (1) is connected with an inlet of a post-cooling device (2), a solid material outlet of the post-cooling device (2) is positioned above the scraper conveyor (5), an outlet of the scraper conveyor (5) is connected with an inlet of a bucket elevator (6), and an outlet of the bucket elevator (6) is sequentially connected with a second screw conveyor (7) and a dry sludge bin (8);
and a gas outlet of the after-cooling device (2) is connected with an upper inlet of the condenser (9).
2. The sludge disc drying system of claim 1, wherein: and a pipeline between a second outlet of the demister (13) and the exhaust fan (14) is connected with the nitrogen cylinder (12).
3. The sludge disc drying system of claim 2, wherein: and a pipeline between the exhaust fan (14) and the carrier gas inlet (102) is provided with an oxygen content detector.
4. The sludge disc drying system of claim 3, wherein: and an outlet in the middle of the condenser (9) discharges industrial water.
5. The sludge disc drying system of claim 4, wherein: the disc drier (1) is provided with a condensation heat exchange system, steam is introduced into an inlet of the condensation heat exchange system, and an outlet of the condensation heat exchange system is connected with a condensation water tank (15).
6. The sludge disc drying system of claim 5, wherein: adding wet sludge through the feed inlet (101).
7. The sludge disc drying system of claim 6, wherein: industrial water is introduced into a cooling water inlet of the after-cooling device (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022111035.6U CN214060318U (en) | 2020-09-23 | 2020-09-23 | Sludge disc drying system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022111035.6U CN214060318U (en) | 2020-09-23 | 2020-09-23 | Sludge disc drying system |
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| CN214060318U true CN214060318U (en) | 2021-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114249517A (en) * | 2020-09-23 | 2022-03-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Sludge disc drying system and drying process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114249517A (en) * | 2020-09-23 | 2022-03-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Sludge disc drying system and drying process |
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