CN107777854B - Negative pressure sludge drying device and method thereof - Google Patents
Negative pressure sludge drying device and method thereof Download PDFInfo
- Publication number
- CN107777854B CN107777854B CN201711104935.4A CN201711104935A CN107777854B CN 107777854 B CN107777854 B CN 107777854B CN 201711104935 A CN201711104935 A CN 201711104935A CN 107777854 B CN107777854 B CN 107777854B
- Authority
- CN
- China
- Prior art keywords
- steel belt
- sludge
- drying box
- belt conveyor
- box body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- 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
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treatment Of Sludge (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides a negative-pressure sludge drying device which comprises a feeding conveying device, a steel belt conveyor, a drying box body, a discharging system, a heating system and a vacuum system, wherein the feeding conveying device is arranged on the bottom of the drying box body; the drying box body is provided with a feed inlet, and the feed inlet is connected with a feed conveying device through a pipeline; the steel belt conveyor is placed inside the drying box body, and an inlet of the steel belt conveyor is connected with the feeding hole through a guide plate; the discharging system is placed in the drying box body and is connected with the outlet of the steel belt conveyor through a mud scraper; the heating system is arranged in the drying box body and used for heating the material on the steel belt conveyor; the vacuum system is arranged on the drying box body and used for enabling the drying box body to generate a vacuum state. According to the invention, the vacuum system generates negative pressure, so that the moisture content of the sludge can be rapidly reduced, the sludge is simple to convey, and the waste of resources is reduced, thereby achieving the effects of saving and protecting the environment.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a negative-pressure sludge drying device and a method thereof.
Background
With the continuous development and deepening of the environmental protection concept, the implementation strength of the national environmental protection policy is continuously strengthened, the sewage treatment rate in the whole country is continuously improved, sewage treatment plants are built in various cities, and the number of large, medium and small sewage treatment plants is hundreds, and the number of sewage treatment plants is rapidly increased. Each sewage treatment plant faces the problem of how to treat a large amount of excess sludge generated every day, and heavy metal substances in a certain proportion contained in the sludge can be enriched in soil after long-term use, are not effectively treated, easily cause secondary pollution to underground water, soil and the like, directly threaten environmental safety and human health, and reduce the environmental benefit of sewage treatment facilities. The sludge incineration realizes 'reduction, stabilization and harmlessness' to the maximum extent, and is the most thorough method for sludge treatment. Sludge incineration can be divided into two categories, one is to directly send the dewatered sludge to an incinerator for incineration, and the other is to incinerate the dewatered sludge after drying. The sludge needs to be dehydrated and heated and dried before being incinerated, and the sludge drying mode is divided into direct drying and indirect drying, and the difference is that whether a heat source is directly used as a heat exchange medium for heating or not, so that the sludge treatment before being incinerated is very important.
Sludge produced by sewage treatment facilities is both a pollutant and a resource. The sludge contains a large amount of organic substances and has fuel value. The dehydrated sludge treatment and resource utilization process technology in China still does not form a unified idea. Therefore, the research on safe, efficient and economic sludge treatment process to realize the reduction, stabilization and harmless treatment of sludge is a problem which needs to be solved urgently in the field of environment.
Aiming at the problem of sludge drying, a plurality of sludge drying devices which take drying as a technical principle emerge on the market. A sludge drying device (publication number: CN104891780A) designed by Changzhou vibration mechanical equipment Limited company adopts an induced draft device to send hot gas into a cavity of a drying bed to heat a steel belt, and is provided with a heat exchanger which can reuse the heat of flue gas after drying sludge. A sludge drying device (publication number: CN106007328A) designed by Yixing pressure vessel factory, Inc. distributes the sludge through a distributing and receiving integrated machine, turns over and receives the sludge through a blade, and also performs physical drying on the sludge by utilizing the greenhouse effect of a sunlight room, thereby saving resources. The Liyan design 'a sludge drying device' (publication number: CN205420121U) is that high-temperature gas is filled in a rotating shaft with a hollow structure, and the temperature of the rotating shaft is increased by the high-temperature gas, so that the temperature in the whole drying box is increased. However, the existing equipment is characterized in that the heating mode is changed, and the property of the sludge is not targeted, so that the heat efficiency is not high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the negative pressure sludge drying device and the method thereof, the negative pressure is generated by the vacuum system, the moisture content of the sludge can be quickly reduced, the conveying is simple, and the resource waste is reduced, so that the effects of saving and protecting the environment are achieved.
The present invention achieves the above-described object by the following technical means.
A negative pressure sludge drying device comprises a feeding conveying device, a steel belt conveyor, a drying box body, a discharging system, a heating system and a vacuum system; the drying box body is provided with a feed inlet, and the feed inlet is connected with a feed conveying device through a pipeline; the steel belt conveyor is placed inside the drying box body, and an inlet of the steel belt conveyor is connected with the feeding hole through a guide plate; the discharging system is placed in the drying box body and is connected with the outlet of the steel belt conveyor through a mud scraper; the heating system is arranged in the drying box body and used for heating the material on the steel belt conveyor; the vacuum system is arranged on the drying box body and used for enabling the drying box body to generate a vacuum state.
Further, the device also comprises a control system, a weighing module, a control valve and a pressure sensor; the weighing module is arranged at the bottom of the steel belt conveyor and used for measuring the weight of the materials; the control valve is positioned between the outlet of the feeding conveying device and the feeding hole of the drying box body; the pressure sensor is arranged on the drying box body and used for measuring the internal pressure of the drying box body; the control system is connected with the weighing module, the control valve, the pressure sensor, the feeding and conveying device, the steel belt conveyor, the discharging system, the heating system and the vacuum system.
Further, the vacuum system comprises a fan, the fan is fixedly connected to the drying box body, and an outlet of the fan is connected with the alkali liquor absorption tower through a pipeline.
Furthermore, a plurality of mud guards parallel to the moving direction of the steel belt conveyor are arranged on a rigid belt of the steel belt conveyor, and the mud guards evenly divide the steel belt into a plurality of conveying areas.
Further, the heating system comprises a coil and a water pump; the coil pipe is positioned at the bottom of the steel belt conveyor, and the inlet of the coil pipe is connected with a heat source through a water pump.
Further, the heat source is industrial wastewater with the temperature not lower than 60 ℃.
A negative pressure sludge drying method comprises the following steps:
s01: the sludge with the water content of 99 percent passes through a belt filter press, and the water content of the output sludge is reduced to 80 percent;
s02: the control system controls the control valve to be opened, starts the screw conveyor, and conveys the sludge with the water content of 80% into the drying box through the screw conveyor; the control system controls the steel belt conveyor to start, and sludge passing through the guide plate is uniformly spread;
s03: when the weighing module reaches a set value M, the control system stops the steel belt conveyor and the spiral conveyor and closes the control valve; the control system controls the heating system and the vacuum system to work, and after T time, sludge with the water content of 80 percent is dried into sludge with the water content of less than 30 percent; wherein the unit of the set value M of the weighing module is KG, and the T time is min;
s04: the control system controls the steel belt conveyor to start, and sludge with the water content lower than 30% is scraped into the discharging system through the mud scraping plate.
Further, the ratio of the set value M of the weighing module to the working time T of the heating device in the step S03 is 0.6-1.2.
Further, in the step S03, the ratio of the set value M of the weighing module to the flow rate of the fan of the vacuum system is: 4-5, wherein the unit of the flow of the fan is L/min.
The invention has the beneficial effects that:
1. according to the negative-pressure sludge drying device, the vacuum system and the heating system are combined, the vacuum system generates negative pressure, the heating system generates high temperature, the moisture content of sludge can be rapidly reduced, the conveying is simple, the resource waste is reduced, and the effect of saving and protecting the environment is achieved.
2. According to the negative-pressure sludge drying device, the mud guard is arranged on the rigid belt of the steel belt conveyor and used for uniformly distributing sludge on the steel belt, and the coil pipe arranged below the steel belt is used for enlarging the heat exchange area, so that the water content of the sludge can be reduced at an accelerated speed.
3. The negative pressure sludge drying method disclosed by the invention realizes the rapid reduction of the water content of the sludge by the combined use of the vacuum system and the heating system.
Drawings
FIG. 1 is a general assembly diagram of the negative pressure sludge drying device of the present invention.
FIG. 2 is a top view of the drying box of the present invention
In the figure:
1-a feed conveyor; 2-control of the valve; 3-a flow guide plate; 4-a steel belt conveyor; 5-a mudguard; 6-a mud scraper; 7-a discharge system; 8-a heating system; 9-a vacuum system; 10-water pump.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1 and 2, the negative pressure sludge drying device of the present invention comprises a feeding and conveying device 1, a steel belt conveyor 4, a drying box, a discharging system 7, a heating system 8 and a vacuum system 9; the drying box body is provided with a feed inlet, and the feed inlet is connected with the feed conveying device 1 through a pipeline; the steel belt conveyor 4 is placed inside the drying box body, and an inlet of the steel belt conveyor 4 is connected with the feeding hole through the guide plate 3; the discharging system 7 is placed in the drying box body, and the discharging system 7 is connected with the outlet of the steel belt conveyor 4 through a mud scraper 6; the heating system 8 is arranged in the drying box body and is used for heating the material on the steel belt conveyor 4; the vacuum system 9 is arranged on the drying box body and is used for enabling the drying box body to generate a vacuum state. The discharging system can be a discharging vehicle simply or a discharging pipeline transported by a conveyor.
In order to facilitate automatic control, the invention also comprises a control system, a weighing module, a control valve 2 and a pressure sensor; the weighing module is arranged at the bottom of the steel belt conveyor 4 and used for measuring the weight of the materials; the control valve 2 is positioned between the outlet of the feeding conveying device 1 and the feeding hole of the drying box body; the pressure sensor is arranged on the drying box body and used for measuring the internal pressure of the drying box body; the control system is connected with the weighing module, the control valve 2, the pressure sensor, the feeding and conveying device 1, the steel belt conveyor 4, the discharging system 7, the heating system 8 and the vacuum system 9. When the weighing module senses that the sludge on the steel belt conveyor 4 reaches a set value, a signal is fed back to the controller, the controller controls the control valve 2 to be closed, and then the vacuum system and the heating system are controlled to be opened.
The vacuum system 9 comprises a fan which is fixedly connected to the drying box body, and an outlet of the fan is connected with the alkali liquor absorption tower through a pipeline.
As shown in fig. 2, in order to accelerate the reduction of the water content of the sludge on the steel strip, a plurality of mud guards 5 parallel to the moving direction of the steel strip conveyor 4 are arranged on the rigid strip of the steel strip conveyor 4, and the steel strip is uniformly divided into a plurality of conveying areas by the plurality of mud guards 5, and the sludge is prevented from leaking laterally in the conveying process. Sludge is directed equally from the feed conveyor 1 through a deflector 3 to several conveying zones. In order to ensure the uniform thickness of the sludge on the steel belt, transverse plates can be arranged between the mud baffles 5 on the two sides of the steel belt conveyor 4, and the uniform thickness of the sludge on the steel belt can be ensured through the transverse plates.
The heating system 8 comprises a coil and a water pump 10; the coil is positioned at the bottom of the steel belt conveyor 4, and the inlet of the coil is connected with a heat source through a water pump 10. The heat source is industrial wastewater with the temperature not lower than 60 ℃.
A negative pressure sludge drying method is characterized by comprising the following steps:
s01: the sludge with the water content of 99 percent passes through a belt filter press, and the water content of the output sludge is reduced to 80 percent;
s02: the control system controls the control valve 2 to be opened, starts the screw conveyor 1, and conveys the sludge with the water content of 80% into the drying box through the screw conveyor 1; the control system controls the steel belt conveyor 4 to start, and sludge passing through the guide plate 3 is uniformly spread;
s03: when the weighing module reaches a set value M, the control system stops the steel belt conveyor 4 and the spiral conveyor 1 and closes the control valve 2; the control system controls the heating system 8 and the vacuum system 9 to work, when the vacuum pressure in the drying box is about-0.05 MPa, after T time, the sludge with the water content of 80 percent is dried into the sludge with the water content of less than 30 percent; and in the step S03, the ratio of the set value M of the weighing module to the working time T of the heating device is 0.6-1.2. In the step S03, the ratio of the set value M of the weighing module to the flow of the fan of the vacuum system 9 is: 4-5; the unit of the set value M of the weighing module is KG, the T time is min, and the unit of the fan flow is L/min.
S04: the control system controls the steel belt conveyor 4 to start, and sludge with the water content lower than 30% is scraped into the discharging system 7 through the mud scraping plate 6. And the waste gas generated by the fan of the vacuum system 9 is discharged to the alkali liquor absorption tower to be treated and reach the standard.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. A negative pressure sludge drying device is characterized by comprising a feeding conveying device (1), a steel belt conveyor (4), a drying box body, a discharging system (7), a heating system (8), a vacuum system (9), a control system, a weighing module, a control valve (2) and a pressure sensor; the drying box body is provided with a feed inlet, and the feed inlet is connected with a feed conveying device (1) through a pipeline; the steel belt conveyor (4) is placed inside the drying box body, and an inlet of the steel belt conveyor (4) is connected with the feeding hole through the guide plate (3); the discharging system (7) is placed in the drying box body, and the discharging system (7) is connected with an outlet of the steel belt conveyor (4) through a mud scraper (6);
the heating system (8) is arranged in the drying box body and is used for heating the materials on the steel belt conveyor (4); the vacuum system (9) is arranged on the drying box body and is used for enabling the drying box body to generate a vacuum state; a plurality of mud guards (5) parallel to the movement direction of the steel belt conveyor (4) are arranged on the steel belt of the steel belt conveyor (4), the steel belt is uniformly divided into a plurality of conveying areas by the mud guards (5), and transverse plates are arranged between the mud guards (5); the weighing module is arranged at the bottom of the steel belt conveyor (4) and is used for measuring the weight of the materials; the control valve (2) is positioned between the outlet of the feeding conveying device (1) and the feeding hole of the drying box body; the pressure sensor is arranged on the drying box body and used for measuring the internal pressure of the drying box body; the control system is connected with the weighing module, the control valve (2), the pressure sensor, the feeding and conveying device (1), the steel belt conveyor (4), the discharging system (7), the heating system (8) and the vacuum system (9).
2. The negative-pressure sludge drying device as claimed in claim 1, wherein the vacuum system (9) comprises a fan, the fan is fixedly connected to the drying box, and an outlet of the fan is connected with the alkali liquor absorption tower through a pipeline.
3. The negative pressure sludge drying device as claimed in claim 1, wherein the heating system (8) comprises a coil and a water pump (10); the coil is positioned at the bottom of the steel belt conveyor (4), and the inlet of the coil is connected with a heat source through a water pump (10).
4. The negative-pressure sludge drying device as claimed in claim 3, wherein the heat source is industrial wastewater with a temperature of not lower than 60 ℃.
5. The negative pressure sludge drying method of the negative pressure sludge drying device according to claim 1, characterized by comprising the following steps:
s01: the sludge with the water content of 99 percent passes through a belt filter press, and the water content of the output sludge is reduced to 80 percent;
s02: the control system controls the control valve (2) to be opened, the feeding and conveying device (1) is started, and the sludge with the water content of 80% is conveyed into the drying box through the feeding and conveying device (1); the control system controls the steel belt conveyor (4) to start, and sludge passing through the guide plate (3) is uniformly spread;
s03: when the weighing module reaches a set value M, the control system stops the steel belt conveyor (4) and the feeding conveying device (1) and closes the control valve (2); the control system controls the heating system (8) and the vacuum system (9) to work, and after T time, sludge with the water content of 80 percent is dried into sludge with the water content of less than 30 percent; wherein the unit of the set value M of the weighing module is KG, and the T time is min; the ratio of the set value M of the weighing module to the working time T of the heating device is 0.6-1.2; the ratio of the set value M of the weighing module to the flow of the fan of the vacuum system (9) is as follows: 4-5, wherein the flow unit of the fan is L/min;
s04: the control system controls the steel belt conveyor (4) to start, and sludge with the water content lower than 30% is scraped into the discharging system (7) through the mud scraping plate (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711104935.4A CN107777854B (en) | 2017-11-10 | 2017-11-10 | Negative pressure sludge drying device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711104935.4A CN107777854B (en) | 2017-11-10 | 2017-11-10 | Negative pressure sludge drying device and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107777854A CN107777854A (en) | 2018-03-09 |
| CN107777854B true CN107777854B (en) | 2021-05-14 |
Family
ID=61431807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711104935.4A Active CN107777854B (en) | 2017-11-10 | 2017-11-10 | Negative pressure sludge drying device and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107777854B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109020143B (en) * | 2018-08-29 | 2020-12-01 | 北京科技大学 | Integrated device for two-stage continuous deep dehydration treatment of livestock and poultry manure |
| CN114275993A (en) * | 2022-01-10 | 2022-04-05 | 南通爱可普环保设备有限公司 | Sequencing batch type low-temperature vacuum belt type sludge drying system and sludge drying method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204897692U (en) * | 2015-08-12 | 2015-12-23 | 江苏众瑞环保科技有限公司 | Mud degree of depth mummification processing system that modifies |
| CN205300185U (en) * | 2016-01-20 | 2016-06-08 | 辛后安 | Thermal balance formula drying -machine |
| CN205816392U (en) * | 2016-07-08 | 2016-12-21 | 江苏三色环境科技有限公司 | Auxiliary conveying device for household garbage |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB210785A (en) * | 1923-02-05 | 1925-03-05 | Will Joseph Sando | System for treating activated sludge |
| CN101372383A (en) * | 2007-08-24 | 2009-02-25 | 林金禄 | Sludge drying apparatus |
| CN204644097U (en) * | 2015-05-12 | 2015-09-16 | 周浩男 | Sub-pressure high-efficient pyrolysis device |
| CN106477847B (en) * | 2016-11-25 | 2019-11-29 | 上海立泉环境科技有限公司 | A kind of Integral sludge filters pressing anhydration system |
-
2017
- 2017-11-10 CN CN201711104935.4A patent/CN107777854B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204897692U (en) * | 2015-08-12 | 2015-12-23 | 江苏众瑞环保科技有限公司 | Mud degree of depth mummification processing system that modifies |
| CN205300185U (en) * | 2016-01-20 | 2016-06-08 | 辛后安 | Thermal balance formula drying -machine |
| CN205816392U (en) * | 2016-07-08 | 2016-12-21 | 江苏三色环境科技有限公司 | Auxiliary conveying device for household garbage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107777854A (en) | 2018-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106380056B (en) | The makeup of municipal sludge depth drying is set | |
| CN201206835Y (en) | Sludge treatment system utilizing pulverized coal boiler of power station | |
| CN103145307A (en) | High temperature carbonization system of sludge and carbonization process | |
| CN205351356U (en) | Lime -ash is handled and is optimized water charging system | |
| CN203513455U (en) | Sludge drying and incineration system | |
| CN107777854B (en) | Negative pressure sludge drying device and method thereof | |
| CN109231756A (en) | One kind being used for sludge desiccation processing equipment | |
| CN109368981A (en) | A kind of sludge semi-dry processing system and processing method | |
| CN113091071A (en) | System for waste incineration deals with low temperature mummification mud in coordination | |
| KR20120051357A (en) | Sludge drying apparatus | |
| CN114702227A (en) | Solid waste cement kiln is processing system in coordination | |
| CN201240987Y (en) | Sludge anhydration system of tail gas waste heat recovery recycle | |
| CN100455528C (en) | Parallel type low-power consumption sludge drying and granulating system | |
| CN103435243B (en) | Parallel sludge low-temperature drying system utilizing waste heat of flue gas | |
| CN215929572U (en) | System for refuse incineration deals with low temperature mummification mud in coordination | |
| CN106477834B (en) | Treatment equipment and technology for repairing simple landfill old sludge soil | |
| CN200978249Y (en) | Parallel connection low energy consumption sludge drying and granulating system | |
| CN211946757U (en) | Municipal sludge dewatering, drying and burning treatment system without adding fuel | |
| CN211226871U (en) | Sludge blending combustion system of thermal power plant | |
| CN109081537A (en) | A kind of Environmental-protection recycling sludge treatment system | |
| KR101171288B1 (en) | A damp garbage processing equipment using waste heat | |
| JPS56127109A (en) | Combined method and apparatus for treating solid waste and sewage | |
| CN105366913A (en) | High-efficient sludge dewatering drying processing system | |
| CN212456887U (en) | Special processing system of municipal administration sludge press filtration | |
| CN205635306U (en) | Contain oil sludge innocent treatment device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |