CN111747628A - Sludge drying system and process with water content of 80% - Google Patents
Sludge drying system and process with water content of 80% Download PDFInfo
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- CN111747628A CN111747628A CN202010684315.8A CN202010684315A CN111747628A CN 111747628 A CN111747628 A CN 111747628A CN 202010684315 A CN202010684315 A CN 202010684315A CN 111747628 A CN111747628 A CN 111747628A
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- sludge
- vertical rotary
- main shaft
- rotary drying
- water content
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
Abstract
The invention provides a sludge drying process with water content of 80%, which comprises (1) a sludge pretreatment process: filtering and crushing the sludge with the water content of 80%; (2) sludge drying process: the sludge enters a sludge atomization nozzle, is uniformly atomized and sprayed on the cylinder wall of the vertical rotary drying equipment from the sludge atomization nozzle for drying, is scraped by a mud scraping plate, and is pushed out of the drying furnace by a mud pushing plate; the steam carried by the drying furnace circulates through a fan, and returns to the drying furnace after sequentially passing through a dehumidification system and a heat exchange system; (3) water treatment and tail gas treatment process: condensate in the dehumidification system enters the existing water treatment system, and tail gas replaced by the vertical rotary drying equipment is sent to the existing tail gas treatment system. The sludge heat exchange surface area is enlarged through the pretreatment system and the atomizing nozzle, and the drying efficiency is improved. In addition, the rotating speed of the nozzle, the temperature of the cylinder wall of the vertical rotary drying equipment and the frequency of the three-shaft screw pump are controlled, so that the purposes of adjusting the water content of the dry sludge and the treatment amount of the sludge are achieved.
Description
Technical Field
The invention relates to the technical field of sludge drying treatment, in particular to a sludge drying system with water content of 80% and a sludge drying process.
Background
Along with the rapid development of economy, the contradiction of environmental protection is increasingly prominent, for example, the existing sludge treatment of sewage treatment plants and some industrial enterprises is simple landfill, but the landfill treatment is serious in land encroachment and not easy to solve in site selection, and if the anti-seepage technology is not enough, the potential soil and underground water pollution is caused, so that for a long time, the treatment is equivalent to the ineffective treatment of sewage in large environment.
At the present stage, the nation encourages coal-fired units to depend on a coal-electricity efficient power generation system and a facility for centralized treatment of pollutants, and to consume and consume biomass resources such as agriculture and forestry waste residues, domestic garbage, sewage treatment plants, water body sludge and the like. And the project for treating the sludge by centralized drying occupies a large area. Therefore, the reduction from the source of the mud production unit is extremely important.
Disclosure of Invention
The invention provides a sludge drying system with water content of 80% and a process thereof, which have the advantages of high heat exchange efficiency, small occupied area and flexible and adjustable treatment amount and are suitable for various sewage treatment plants and industrial sludge production enterprises. The reduction of the sludge source can be realized, and the pressure is reduced for the subsequent burning disposal of the coal-fired unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vertical rotary drying device comprises a furnace body, a hollow rotary main shaft, a driving motor for driving the rotary main shaft to rotate, a plurality of mud scraping plates and mud pushing plates; the top of the furnace body is provided with a bearing, the bottom of the furnace body is provided with a bearing and a discharge hole, the rotating main shaft penetrates through the upper bearing and the lower bearing, the two ends of the rotating main shaft are respectively provided with the feed hole and the discharge hole, and an inner cavity of the rotating main shaft forms a sludge channel; the side wall of the rotating main shaft is provided with a plurality of sludge atomizing nozzles which are longitudinally arranged and communicated with the inner cavity of the rotating main shaft, a plurality of connecting rods which are longitudinally arranged and a mud pushing plate, and one end of each connecting rod, far away from the rotating main shaft, is connected with the mud scraping plate; the mud scraping plate and the mud pushing plate are respectively tightly attached to the inner side wall and the bottom surface of the furnace body; the furnace body is provided with an air inlet and an air outlet; a heat supply medium cavity is arranged in the wall of the furnace body, and a steam inlet and a steam outlet are arranged on the wall of the furnace body.
Further, the high-pressure back flushing system comprises a compressor and an air storage tank, wherein an air inlet and an air outlet of the compressor are respectively connected with the air storage tank and the rotating main shaft.
Furthermore, the horizontal included angle between the connecting rod and the atomizing nozzle is 10 degrees; the included angle between the mud pushing plate and the scraper is 90 degrees.
Furthermore, the sludge atomizing nozzle is a high-pressure double-channel nozzle, the atomizing particle size is less than 2mm, and the spraying angle is adjustable.
The sludge treatment system with the water content of 80% based on the sludge drying furnace comprises a sludge pretreatment system, a vertical rotary drying device, a heat supply system and a tail gas treatment system; the sludge pretreatment system is used for filtering and crushing sludge, and a sludge outlet of the sludge pretreatment system is connected with a feed inlet of the rotary main shaft; an air outlet of the vertical rotary drying equipment is connected with a tail gas treatment system; the steam inlet of the vertical rotary drying equipment is connected with a heat supply system.
The air outlet of the vertical rotary drying equipment and the air inlet of the heat exchange system are respectively connected with the air inlet of the fan, the air outlet of the heat exchange system is connected with the air inlet of the fan, and the air outlet of the fan is connected with the air inlet of the vertical rotary drying equipment.
Further, the device also comprises an air preheating system, wherein an air inlet and an air outlet of the air preheating system are respectively connected with air and an air inlet of the fan.
Furthermore, the sludge pretreatment system comprises a sludge storage bin, a first three-axis screw pump, a Y-shaped filter, a buffer discharge bin and a second three-axis screw pump which are sequentially connected, and a sludge outlet of the second three-axis screw pump is connected with a feed inlet of the rotary main shaft.
The sludge drying process with the water content of 80 percent based on the sludge treatment system comprises the following steps:
step 1: feeding sludge with the water content of 80% into a sludge pretreatment system for filtering and crushing treatment, so that the particle size of particles in the sludge is smaller than 5 mm;
step 2: the sludge is sent into the rotating main shaft, the sludge is evenly atomized and sprayed on the inner wall of the vertical rotary drying equipment from the sludge atomizing nozzle, a formed sludge film exchanges heat with the high-temperature cylinder wall, the dried sludge is pushed down by the rotating scraper and falls to the bottom of the drying equipment, and then the sludge pushing plate pushes out the discharge hole of the vertical rotary drying equipment.
Furthermore, tail gas in the vertical rotary drying equipment sequentially passes through the dehumidification system and the heat exchange system and then returns to the vertical rotary drying equipment for discharging the tail gas in the vertical rotary drying equipment.
Has the advantages that: the original heat source of each sludge production unit is utilized to atomize sludge with the water content of 80 percent into small particles to form a sludge film, and the sludge film is subjected to indirect heat exchange drying with a drying furnace. According to actual requirements, the reduction of the sludge is adjusted by controlling the temperature of a heat supply system, the rotating speed of a main shaft and the frequency of a three-shaft screw pump. The sewage and the tail gas generated in the reduction process enter the existing sewage treatment system and the tail gas treatment system of an enterprise, so that the benefit is maximized.
Drawings
FIG. 1 is a main process flow diagram of the present invention.
Fig. 2 is a front view and a top view of the vertical rotary drying apparatus of the present invention.
Reference numbers in the figures: 1. a rotary joint; 2. a mud scraper; 3. rotating the main shaft; 4. a sludge atomizing nozzle; 5. a cylinder wall; 6. a heat-supplying medium; 7. an air outlet; 8. an air inlet; 9. a mud pushing plate; 10. and (4) a discharge port.
Detailed Description
The invention is further explained below with reference to the drawings.
The invention is realized by the following technical scheme, comprising the following steps:
(1) sludge pretreatment process: the method comprises the following steps that sludge with the water content of 80% enters a sludge storage bin, a bin contains a grating and a filter screen to remove impurities, a three-shaft screw pump is arranged at the bottom of the bin, a Y-shaped filter is arranged at the outlet of the three-shaft screw pump to remove the impurities, and the sludge with the water content of 80% enters a cache storage bin after being pressurized by the screw pump. The bottom of the buffer storage bin is provided with a three-shaft screw pump, and the three-shaft screw pump pressurizes sludge to 20MPa and sends the sludge into a sludge atomizing nozzle;
(2) sludge drying process: the sludge after secondary pressurization enters a sludge atomizing nozzle, and a high-pressure back-blowing device is used for removing impurities blocking the nozzle. The sludge is uniformly atomized and sprayed on the cylinder wall of the vertical rotary drying equipment by the rotary nozzle, a formed sludge film exchanges heat with the high-temperature cylinder wall, and the dried sludge is pushed down by the rotary mud scraping plate and falls to the bottom of the drying equipment. And (3) conveying the dry sludge to a gravity type discharge valve by a sludge pushing plate at the bottom of the drying equipment, opening the valve to discharge after the dry sludge reaches a certain weight, and finally conveying the dry sludge to a dry sludge storage bin through a scraper. The vapor carried by the vertical rotary drying equipment circulates through a fan, and then returns to the drying equipment after sequentially passing through a dehumidification system and a heat exchange system, the dehumidification system removes condensed water in the vapor, and the heat exchange system heats tail gas;
(3) water treatment and tail gas treatment process: and (4) the condensate in the dehumidification system enters a water treatment system, and is discharged after the treatment reaches the standard. And (4) conveying the tail gas replaced by the vertical rotary drying equipment into a tail gas treatment system, and discharging after the treatment reaches the standard.
Preferably, the rotor at the front end of the three-shaft screw pump can crush impurities in sludge, and the pressure of the pump outlet is 25MPa at the lowest.
Preferably, the sludge atomizing nozzle is a high-pressure double-channel nozzle, the atomizing particle size is less than 2mm, and the spraying angle is adjustable.
Preferably, the contact side of the high-temperature cylinder wall and the sludge has large roughness.
Preferably, the mud pushing plate is a rectangular high-temperature-resistant polymer plate with the thickness of 20 mm.
Preferably, the scraper is a 316L stainless steel plate 5mm thick.
Preferably, the gravity type discharge valve plate is lined with a high polymer plate.
Example (b):
the sludge dewatering machine of the sludge production unit conveys sludge with the water content of 80 percent to a sludge storage bin, and the sludge enters a feed inlet of a three-axis screw pump through a vibration grating with the particle size of 20 multiplied by 20mm and a filter screen of the storage bin, and most impurities and fibers with the particle size of more than 20mm are screened out. After entering the screw pump, the sludge enters the Y-shaped filter after being crushed and pressurized by the rotor, particulate matters with the particle size of more than 5mm are removed, and the filtered sludge is distributed to a plurality of buffer storage bins. Because the impurity in the sludge is uncertain, the risk of blocking the filter screen in the filtering process is high, all the buffer storage bins need to be in a full state before the system runs, and the stable and continuous running of the subsequent process is ensured.
The sludge in the buffer storage bin enters the rotating main shaft 3 after being crushed and pressurized for the second time by the three-shaft screw pump. The main shaft 3 is provided with a sludge atomizing nozzle 4, a mud scraping plate 2 and a mud pushing plate 9, and the upper end and the lower end of the main shaft are respectively connected with a three-shaft screw pump and a slag discharging pipeline through rotary joints. The main shaft 3 rotates anticlockwise, and sludge is vertically sprayed onto the cylinder wall 5 through the plurality of nozzles 4 to form a film. After rotating for a circle, the sludge scraping plate 2 scrapes the dried sludge film on the cylinder wall 5, and the nozzle 4 continuously sprays sludge on the cylinder wall 5 which is scraped completely, and the process is repeated. The dry sludge is hung down by the mud scraping plate 2, falls to the bottom of the drying equipment and is conveyed to a discharge hole 10 by a mud pushing plate 9 of the polymer plate. The discharge port 10 is provided with a gravity type discharge valve, when the dry sludge exceeds a certain weight, the valve plate is opened under the action of the sludge, and the valve plate is automatically closed and sealed after the sludge is discharged, so that the heat loss is reduced, and meanwhile, the tail gas is prevented from overflowing. And finally, conveying the dry sludge to a dry sludge storage bin by a scraper conveyor, and transporting the dry sludge to a coal-fired power plant for mixing and burning with coal at a later stage.
When the nozzle 4 is blocked by impurities, a pressure signal can be fed back to the high-pressure back blowing system, and the system works to reversely blow out the impurities and send the impurities to the temporary collecting bin through the slag discharging pipeline.
And the steam generated in the sludge drying process is extracted from the air outlet 7, removed with water vapor through the dehumidification system, heated to 80 ℃ through the heat exchange system, and finally returned to the drying equipment for circulation. The air preheating system can quantitatively supply air to the drying equipment, and the existing tail gas treatment system of an enterprise can pump out part of tail gas for treatment. The steam-carrying condensate of the dehumidification system is collected and conveyed to the existing water treatment system of an enterprise by a centrifugal pump for treatment.
The heat source of the drying equipment can be selected according to the self condition of an enterprise, and steam, hot water, heat conducting oil, electric tracing and the like can be used as the drying heat source.
The drying time of the sludge on the cylinder wall is determined by the rotation speed of the main shaft, the thickness of the sludge film is mainly determined by the frequency of the three-shaft screw pump, and the water content of the dry sludge is mainly determined by the temperature of a heat supply system.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A vertical rotary drying device is characterized by comprising a furnace body, a hollow rotary main shaft, a driving motor for driving the rotary main shaft to rotate, a plurality of mud scraping plates and mud pushing plates; the top of the furnace body is provided with a bearing, the bottom of the furnace body is provided with a bearing and a discharge hole, the rotating main shaft penetrates through the upper bearing and the lower bearing, the two ends of the rotating main shaft are respectively provided with the feed hole and the discharge hole, and an inner cavity of the rotating main shaft forms a sludge channel; the side wall of the rotating main shaft is provided with a plurality of sludge atomizing nozzles which are longitudinally arranged and communicated with the inner cavity of the rotating main shaft, a plurality of connecting rods which are longitudinally arranged and a mud pushing plate, and one end of each connecting rod, far away from the rotating main shaft, is connected with the mud scraping plate; the mud scraping plate and the mud pushing plate are respectively tightly attached to the inner side wall and the bottom surface of the furnace body; the furnace body is provided with an air inlet and an air outlet; a heat supply medium cavity is arranged in the wall of the furnace body, and a steam inlet and a steam outlet are arranged on the wall of the furnace body.
2. The vertical rotary drying apparatus according to claim 1, further comprising a high pressure back-blowing system, wherein the high pressure back-blowing system comprises a compressor and an air storage tank, and an air inlet and an air outlet of the compressor are respectively connected to the air storage tank and the rotary spindle.
3. The vertical rotary drying apparatus according to claim 1, wherein the horizontal angle between the connecting rod and the atomizing nozzle is 10 °; the included angle between the mud pushing plate and the scraper is 90 degrees.
4. The vertical rotary drying equipment as claimed in claim 1, wherein the sludge atomization nozzle is a high-pressure double-channel nozzle, the atomization particle diameter is less than 2mm, and the spraying angle is adjustable.
5. The sludge treatment system with the water content of 80% based on the sludge drying furnace of claim 1, which is characterized by comprising a sludge pretreatment system, a vertical rotary drying device, a heat supply system and a tail gas treatment system; the sludge pretreatment system is used for filtering and crushing sludge, and a sludge outlet of the sludge pretreatment system is connected with a feed inlet of the rotary main shaft; an air outlet of the vertical rotary drying equipment is connected with a tail gas treatment system; the steam inlet of the vertical rotary drying equipment is connected with a heat supply system.
6. The sludge treatment system with the water content of 80% according to claim 5, further comprising a dehumidification system, a heat exchange system and a fan, wherein an air inlet and an air outlet of the dehumidification system are respectively connected with an air outlet of the vertical rotary drying device and an air inlet of the heat exchange system, an air outlet of the heat exchange system is connected with an air inlet of the fan, and an air outlet of the fan is connected with an air inlet of the vertical rotary drying device.
7. The system of claim 6, further comprising an air preheating system having an air inlet and an air outlet connected to the air inlet of the air blower and the air outlet of the air preheating system, respectively.
8. The sludge treatment system with the water content of 80% according to claim 5, wherein the sludge pretreatment system comprises a sludge storage bin, a first three-axis screw pump, a Y-shaped filter, a buffer discharge bin and a second three-axis screw pump which are sequentially connected, and a sludge outlet of the second three-axis screw pump is connected with a feed inlet of the rotary main shaft.
9. The sludge drying process with water content of 80% based on the sludge treatment system of claim 6, which is characterized by comprising the following steps:
step 1: feeding sludge with the water content of 80% into a sludge pretreatment system for filtering and crushing treatment, so that the particle size of particles in the sludge is smaller than 5 mm;
step 2: the sludge is sent into the rotating main shaft, the sludge is evenly atomized and sprayed on the inner wall of the vertical rotary drying equipment from the sludge atomizing nozzle, a formed sludge film exchanges heat with the high-temperature cylinder wall, the dried sludge is pushed down by the rotating scraper and falls to the bottom of the vertical rotary drying equipment, and then the sludge pushing plate pushes out the discharge hole of the vertical rotary drying equipment.
10. The sludge drying process with the water content of 80% as claimed in claim 9, wherein the tail gas in the sludge drying furnace sequentially passes through the dehumidification system and the heat exchange system and then returns to the vertical rotary drying device for discharging the tail gas in the vertical rotary drying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010684315.8A CN111747628A (en) | 2020-07-16 | 2020-07-16 | Sludge drying system and process with water content of 80% |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010684315.8A CN111747628A (en) | 2020-07-16 | 2020-07-16 | Sludge drying system and process with water content of 80% |
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| CN111747628A true CN111747628A (en) | 2020-10-09 |
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| CN202010684315.8A Pending CN111747628A (en) | 2020-07-16 | 2020-07-16 | Sludge drying system and process with water content of 80% |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113695052A (en) * | 2021-08-27 | 2021-11-26 | 中野环保科技(重庆)股份有限公司 | Pretreatment method and device for dangerous electroplating sludge from social source |
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2020
- 2020-07-16 CN CN202010684315.8A patent/CN111747628A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005140484A (en) * | 2003-11-04 | 2005-06-02 | Yasunobu Yoshida | Method for circulation type drying and pulverizing fuel system of waste, and device therefor |
| CN103073168A (en) * | 2012-12-20 | 2013-05-01 | 东南大学 | Flue gas-sludge indirect contact drying device and method |
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| CN107540189A (en) * | 2017-09-30 | 2018-01-05 | 沈艳 | From lazy formula closed cycle drying system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113695052A (en) * | 2021-08-27 | 2021-11-26 | 中野环保科技(重庆)股份有限公司 | Pretreatment method and device for dangerous electroplating sludge from social source |
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Application publication date: 20201009 |