CN110902998A - Wet sludge drying process - Google Patents
Wet sludge drying process Download PDFInfo
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- CN110902998A CN110902998A CN201911278351.8A CN201911278351A CN110902998A CN 110902998 A CN110902998 A CN 110902998A CN 201911278351 A CN201911278351 A CN 201911278351A CN 110902998 A CN110902998 A CN 110902998A
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- sludge
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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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a wet sludge drying process which is characterized by comprising the following steps: conveying sludge in a wet sludge storage bin into a filtering device through a conveying device, applying pressure to the wet sludge in the filtering device, filtering out partial sewage to reduce the water content in the sludge to 80-85%, heating and drying the sludge by using smoke for the first time to reduce the water content in the sludge to 50-60%, heating and drying the sludge by using the smoke for the second time to reduce the water content in the sludge to 30-40%, evaporating water in the sludge by using low-pressure steam to reduce the water content in the sludge to below 10%, granulating the dried sludge, and conveying the granulated dried sludge to a corresponding collection position through a conveying belt. The invention carries out sectional drying on the sludge, has good sludge drying effect, saves energy, improves efficiency, and carries out sectional drying, thereby avoiding continuous work of one machine and prolonging the service life of the machine.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a wet sludge drying process.
Background
The municipal sludge refers to solid waste generated in the process of treating municipal domestic sewage and industrial wastewater, and is a frequent product of a municipal sewage treatment plant. The sludge has high water content, is easy to rot, has strong odor, and contains toxic substances such as bacteria, parasitic ova, heavy metals and the like. Therefore, the sludge needs to be harmlessly treated and reused, and the drying of the sludge is a necessary step for the sludge treatment. The existing drying method mainly comprises the following steps: traditional heat energy sludge drying and electric energy sludge drying, the power consumption is high, and required cost is high to during the mummification, mostly directly put into the mummification machine with mud and carry out the mummification, until the sludge mummification, the machine lasts work, fragile.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a wet sludge drying process.
In order to achieve the purpose, the invention adopts the following technical scheme: the wet sludge drying process is characterized by comprising the following steps:
(1) feeding and conveying, namely conveying the sludge in the wet sludge storage bin into a filtering device through a conveying device.
(2) And (3) filtering, namely applying pressure to the wet sludge in the filtering device, filtering out partial sewage to reduce the water content in the sludge to 80-85%, and discharging the filtered sewage into a wastewater collection tank through a drain pipe.
(3) And (3) a sludge drying stage, namely conveying the sludge filtered in the step (2) into a first drying machine, opening a valve on a flue gas pipeline, discharging the flue gas into the first drying machine after desulfurization and denitrification treatment and dust removal treatment, heating and drying the sludge for the first time to reduce the water content in the sludge to 50-60%, discharging gas generated in the heating process into the first pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the first pipeline and discharging the water into a wastewater collecting tank.
(4) And (3) a sludge drying stage, namely conveying the sludge subjected to primary drying in the step (3) into a second drying machine, opening a valve on a flue gas pipeline, discharging the flue gas into the second drying machine after desulfurization and denitrification treatment and dust removal treatment, heating and drying the sludge for the second time to reduce the water content in the sludge to 30-40%, discharging gas generated in the heating process into the second pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the second pipeline and discharging the water into a wastewater collecting tank.
(5) And (4) drying and granulating the sludge, conveying the sludge dried for the second time in the step (4) to a drying and granulating machine, opening a valve on a steam pipeline, conveying low-pressure steam to the drying and granulating machine, evaporating water in the sludge to reduce the water content in the sludge to be below 10%, granulating the dried sludge, discharging evaporated gas into a third pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the third pipeline to be discharged into a wastewater collecting tank.
(6) And (5) conveying the dried sludge granulated in the step (5) to a corresponding collection position through a conveyor belt.
Particularly, the conveying device in the step (1) is a screw conveying pump.
In particular, the filtering device in the step (2) is a filter press.
Particularly, the flue gas for heating the sludge in the step (3) and the step (4) is furnace flue gas or coal-fired flue gas, and the temperature of the flue gas is 120-200 ℃.
In particular, the steam temperature in the step (5) is 160-230 ℃, and the pressure is 1.0 MPa.
In particular, the grain size of the sludge after granulation in the step (5) is 4-8 mm.
Particularly, the waste gas generated in the step (1) and the step (2) is discharged into the atmosphere after being deodorized and dedusted.
The invention has the beneficial effects that: the invention carries out sectional drying on the sludge, and the sludge is dried by using the furnace flue gas and the coal-fired flue gas in one stage and two stages, thereby not only effectively utilizing the furnace flue gas and saving resources, but also using the coal-fired flue gas when the furnace stops working, having low energy and reducing cost; the sludge is dried by using low-pressure steam in the three stages, the energy is clean, the sludge can be directly and completely utilized, the sludge drying effect is good, and the sludge is directly granulated in the three stages, so that the subsequent processing is convenient; meanwhile, sludge is filtered before drying, partial sewage is effectively filtered, drying time is shortened, energy is saved, efficiency is improved, drying is carried out in stages, continuous work of one machine is avoided, and service life of the machine is prolonged.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The wet sludge drying process is characterized by comprising the following steps:
(1) feeding and conveying, namely conveying the sludge in the wet sludge storage bin into a filter press through a screw conveying pump, and discharging waste gas generated in the conveying process into the atmosphere after deodorization and dust removal.
(2) And (3) filtering, namely applying pressure to wet sludge in a filter press, filtering out partial sewage to reduce the water content in the sludge to 80%, discharging the filtered sewage into a wastewater collection tank through a drain pipe, and discharging the waste gas generated in the filtering process into the atmosphere after deodorization and dust removal.
(3) And (3) a sludge drying stage, namely conveying the sludge filtered in the step (2) into a first drying machine, opening a valve on a furnace flue gas pipeline, discharging the flue gas into the first drying machine after desulfurization and denitrification treatment and dust removal treatment, wherein the temperature of the flue gas is 200 ℃, heating and drying the sludge for the first time to reduce the water content in the sludge to 50%, discharging gas generated in the heating process into the first pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the first pipeline to be discharged into a wastewater collecting tank.
(4) And (2) a sludge drying stage, namely conveying the sludge subjected to primary drying in the step (3) into a second drying machine, opening a valve on a furnace flue gas pipeline, discharging the flue gas into the second drying machine after desulfurization and denitrification treatment and dust removal treatment, wherein the temperature of the flue gas is 200 ℃, heating and drying the sludge for the second time to reduce the water content in the sludge to 30%, discharging gas generated in the heating process into the second pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the second pipeline to be discharged into a wastewater collecting tank.
(5) Drying and granulating the sludge, conveying the sludge dried for the second time in the step (4) to a drying granulator, opening a valve on a steam pipeline, conveying low-pressure steam to the drying granulator, wherein the steam temperature is 230 ℃, the pressure is 1.0MPa, evaporating moisture in the sludge to reduce the water content in the sludge to below 10%, granulating the dried sludge, and discharging the evaporated gas into a third pipeline after deodorization and dust removal, and condensing the evaporated gas into water under the action of a condensing device in the third pipeline to be discharged into a wastewater collecting tank.
(6) And (5) conveying the dried sludge granulated in the step (5) to a corresponding collection position through a conveyor belt.
Example 2
The wet sludge drying process is characterized by comprising the following steps:
(1) feeding and conveying, namely conveying the sludge in the wet sludge storage bin into a filter press through a screw conveying pump, and discharging waste gas generated in the conveying process into the atmosphere after deodorization and dust removal.
(2) And (3) filtering, namely applying pressure to wet sludge in a filter press, filtering out partial sewage to reduce the water content in the sludge to 85%, discharging the filtered sewage into a wastewater collection tank through a drain pipe, and discharging the waste gas generated in the filtering process into the atmosphere after deodorization and dust removal.
(3) And (3) a sludge drying stage, namely conveying the sludge filtered in the step (2) into a first drying machine, when a furnace kiln stops working, opening a valve on a coal-fired flue gas pipeline by using coal-fired flue gas, discharging the flue gas into the first drying machine after desulfurization and denitrification treatment and dust removal treatment, heating the dried sludge at the flue gas temperature of 120 ℃, reducing the water content in the sludge to 60 percent, discharging gas generated in the heating process into a first pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the first pipeline, and discharging the water into a wastewater collecting tank.
(4) And (3) a sludge drying stage, namely conveying the sludge subjected to primary drying in the step (3) into a second drying machine, opening a valve on a coal-fired flue gas pipeline, discharging the flue gas into the second drying machine after desulfurization and denitrification treatment and dust removal treatment, wherein the temperature of the flue gas is 120 ℃, heating and drying the sludge for the second time to reduce the water content in the sludge to 40%, deodorizing and dedusting the gas generated in the heating process, discharging the gas into the second pipeline, and condensing the gas into water under the action of a condensing device in the second pipeline to discharge the water into a wastewater collecting tank.
(5) Drying and granulating the sludge, conveying the sludge dried for the second time in the step (4) to a drying granulator, opening a valve on a steam pipeline, conveying low-pressure steam to the drying granulator, wherein the steam temperature is 160 ℃, the pressure is 1.0MPa, evaporating moisture in the sludge to reduce the water content in the sludge to below 10%, granulating the dried sludge, and discharging the evaporated gas into a third pipeline after deodorization and dust removal, and condensing the evaporated gas into water under the action of a condensing device in the third pipeline to be discharged into a wastewater collecting tank.
(6) And (5) conveying the dried sludge granulated in the step (5) to a corresponding collection position through a conveyor belt.
Example 3
The wet sludge drying process is characterized by comprising the following steps:
(1) feeding and conveying, namely conveying the sludge in the wet sludge storage bin into a filter press through a screw conveying pump, and discharging waste gas generated in the conveying process into the atmosphere after deodorization and dust removal.
(2) And (3) filtering, namely applying pressure to wet sludge in a filter press, filtering out partial sewage to reduce the water content in the sludge to 82.5%, discharging the filtered sewage into a wastewater collection tank through a drain pipe, and discharging the waste gas generated in the filtering process into the atmosphere after deodorization and dust removal.
(3) And (3) a sludge drying stage, namely conveying the sludge filtered in the step (2) into a first drying machine, opening a valve on a furnace flue gas pipeline, discharging the flue gas into the first drying machine after desulfurization and denitrification treatment and dust removal treatment, wherein the temperature of the flue gas is 160 ℃, heating and drying the sludge for the first time to reduce the water content in the sludge to 55%, discharging gas generated in the heating process into the first pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the first pipeline to be discharged into a wastewater collecting tank.
(4) And (3) a sludge drying stage, namely conveying the sludge subjected to primary drying in the step (3) into a second drying machine, opening a valve on a coal-fired flue gas pipeline, discharging the flue gas into the second drying machine after desulfurization and denitrification treatment and dust removal treatment, wherein the temperature of the flue gas is 160 ℃, heating and drying the sludge for the second time to reduce the water content in the sludge to 35%, deodorizing and dedusting the gas generated in the heating process, discharging the gas into the second pipeline, and condensing the gas into water under the action of a condensing device in the second pipeline to discharge the water into a wastewater collecting tank.
(5) Drying and granulating the sludge, conveying the sludge dried for the second time in the step (4) to a drying granulator, opening a valve on a steam pipeline, conveying low-pressure steam to the drying granulator, wherein the steam temperature is 195 ℃, the pressure is 1.0MPa, evaporating moisture in the sludge to reduce the water content in the sludge to below 10%, granulating the dried sludge, and discharging the evaporated gas into a third pipeline after deodorization and dust removal, and condensing the evaporated gas into water under the action of a condensing device in the third pipeline to be discharged into a wastewater collecting tank.
(6) And (5) conveying the dried sludge granulated in the step (5) to a corresponding collection position through a conveyor belt.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the specific embodiments described above, but is intended to cover various modifications, which may be made by the methods and technical solutions of the invention, or may be applied to other applications without modification.
Claims (7)
1. The wet sludge drying process is characterized by comprising the following steps:
(1) feeding and conveying, namely conveying the sludge in the wet sludge storage bin into a filtering device through a conveying device.
(2) And (3) filtering, namely applying pressure to the wet sludge in the filtering device, filtering out partial sewage to reduce the water content in the sludge to 80-85%, and discharging the filtered sewage into a wastewater collection tank through a drain pipe.
(3) And (3) a sludge drying stage, namely conveying the sludge filtered in the step (2) into a first drying machine, opening a valve on a flue gas pipeline, discharging the flue gas into the first drying machine after desulfurization and denitrification treatment and dust removal treatment, heating and drying the sludge for the first time to reduce the water content in the sludge to 50-60%, discharging gas generated in the heating process into the first pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the first pipeline and discharging the water into a wastewater collecting tank.
(4) And (3) a sludge drying stage, namely conveying the sludge subjected to primary drying in the step (3) into a second drying machine, opening a valve on a flue gas pipeline, discharging the flue gas into the second drying machine after desulfurization and denitrification treatment and dust removal treatment, heating and drying the sludge for the second time to reduce the water content in the sludge to 30-40%, discharging gas generated in the heating process into the second pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the second pipeline and discharging the water into a wastewater collecting tank.
(5) And (4) drying and granulating the sludge, conveying the sludge dried for the second time in the step (4) to a drying and granulating machine, opening a valve on a steam pipeline, conveying low-pressure steam to the drying and granulating machine, evaporating water in the sludge to reduce the water content in the sludge to be below 10%, granulating the dried sludge, discharging evaporated gas into a third pipeline after deodorization and dust removal, and condensing the gas into water under the action of a condensing device in the third pipeline to be discharged into a wastewater collecting tank.
(6) And (5) conveying the dried sludge granulated in the step (5) to a corresponding collection position through a conveyor belt.
2. The wet sludge drying process according to claim 1, wherein the conveying device in the step (1) is a screw conveying pump.
3. The wet sludge drying process as claimed in claim 1, wherein the filtering device in the step (2) is a filter press.
4. The wet sludge drying process as claimed in claim 1, wherein the flue gas for heating the sludge in the step (3) and the step (4) is furnace flue gas or coal-fired flue gas, and the temperature of the flue gas is 120-200 ℃.
5. The wet sludge drying process as claimed in claim 1, wherein the steam temperature in step (5) is 160-230 ℃ and the pressure is 1.0 MPa.
6. The wet sludge drying process as claimed in claim 1, wherein the particle size of the granulated sludge in the step (5) is 4-8 mm.
7. The wet sludge drying process according to claim 1, wherein the waste gas generated in the steps (1) and (2) is deodorized and dedusted and then discharged into the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911278351.8A CN110902998A (en) | 2019-12-13 | 2019-12-13 | Wet sludge drying process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911278351.8A CN110902998A (en) | 2019-12-13 | 2019-12-13 | Wet sludge drying process |
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| CN110902998A true CN110902998A (en) | 2020-03-24 |
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| CN201911278351.8A Withdrawn CN110902998A (en) | 2019-12-13 | 2019-12-13 | Wet sludge drying process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943092A (en) * | 2021-11-16 | 2022-01-18 | 浙江诺丰环保科技有限公司 | Drying device and drying method for printing and dyeing sludge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5215670A (en) * | 1990-02-26 | 1993-06-01 | Bio Gro Systems, Inc. | Process of drying and pelletizing sludge in indirect dryer having recycled sweep air |
| CN103011546A (en) * | 2012-12-05 | 2013-04-03 | 上海巴安水务股份有限公司 | Two-stage sludge drying and energy recovering system and drying process thereof |
| CN103435244A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Parallel sludge low-temperature drying method utilizing waste heat of flue gas |
-
2019
- 2019-12-13 CN CN201911278351.8A patent/CN110902998A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5215670A (en) * | 1990-02-26 | 1993-06-01 | Bio Gro Systems, Inc. | Process of drying and pelletizing sludge in indirect dryer having recycled sweep air |
| CN103011546A (en) * | 2012-12-05 | 2013-04-03 | 上海巴安水务股份有限公司 | Two-stage sludge drying and energy recovering system and drying process thereof |
| CN103435244A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Parallel sludge low-temperature drying method utilizing waste heat of flue gas |
Non-Patent Citations (1)
| Title |
|---|
| 李闻欣 编著: "《皮革环保工程概论》", 31 August 2015 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113943092A (en) * | 2021-11-16 | 2022-01-18 | 浙江诺丰环保科技有限公司 | Drying device and drying method for printing and dyeing sludge |
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