CN112744997A - Counter-flow type sludge drying process - Google Patents
Counter-flow type sludge drying process Download PDFInfo
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- CN112744997A CN112744997A CN202011624964.5A CN202011624964A CN112744997A CN 112744997 A CN112744997 A CN 112744997A CN 202011624964 A CN202011624964 A CN 202011624964A CN 112744997 A CN112744997 A CN 112744997A
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- 239000010802 sludge Substances 0.000 title claims abstract description 150
- 238000001035 drying Methods 0.000 title claims abstract description 137
- 239000000463 material Substances 0.000 claims abstract description 80
- 238000003756 stirring Methods 0.000 claims description 30
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000009423 ventilation Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000007605 air drying Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 230000007480 spreading Effects 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 208000005156 Dehydration Diseases 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003834 intracellular effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of sludge drying treatment, and discloses a counter-flow sludge drying process, which changes the linear turning movement into the rotary turning movement by stacking a large number of paving areas layer by layer, finally realizes the effect of spreading, airing and drying by tens of times by utilizing effective land resources, realizes the effect of natural drying by tens of times by utilizing limited land resources, achieves the aim of saving land resources, maintains the original spreading area, utilizes low-temperature dry air to carry out air drying, has lower cost, has low requirements on mechanical equipment and working conditions, has proper working environment, low installation conditions, can be popularized and used on a large scale, reduces the transportation cost caused by material transfer, avoids material loss and environmental pollution in the process of material transportation, and achieves the aim of protecting the environment, the whole set of equipment has high system integration level, strong production operation operability and high efficiency.
Description
Technical Field
The invention relates to the technical field of sludge drying treatment, in particular to a counter-flow type sludge drying process.
Background
The sludge treatment industry is concerned as a novel environment-friendly industry, the moisture content of sludge per se is high and can often reach more than 80%, the biggest difficulty in the current sludge treatment is the separation of sludge moisture, the organic matter of the sludge per se is more, and the moisture is mostly intracellular water, so that the sludge moisture is difficult to be quickly dried, the sludge is directly heated, dried or incinerated, a large amount of energy is inevitably consumed, the cost is huge, a physical sludge extrusion dehydration process is available in the market, although a large amount of energy is not consumed, the dehydration capacity is limited, the moisture content of filter-pressed sludge cakes can often reach 50-60%, and the drying purpose cannot be thoroughly completed; most of China is mainly treated by landfill, although the problem of dehydration is avoided in landfill, the sludge contains a large amount of moisture and heavy metal components, so that the peripheral land resources and underground water resources can be polluted after the sludge is buried, and the landfill method is slowly forbidden under the increasingly strict environment protection condition, so a new effective sludge dehydration treatment mode is needed at present. In recent years, a sludge spreading and airing mode is also provided, the sludge is doped with a modifier, intracellular water is changed into extracellular water, and the drying purpose of the sludge reclaimed material is finally realized by turning, airing and drying activities for 5-10 days in the modes of solar energy, terrestrial heat, air quantity and the like under natural working conditions.
Therefore, the sludge treatment method in the prior art has the problems of environmental pollution, low efficiency and large occupied area. In view of the above, a counter-flow sludge drying process is proposed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a counter-flow sludge drying process, which has the advantages of high-efficiency drying, environmental protection, small occupied space and the like, and solves the problems in the background art.
(II) technical scheme
In order to achieve the purposes of high-efficiency drying, environmental protection and small occupied space, the invention provides the following technical scheme: a counter-flow sludge drying process comprises the following steps:
1) pretreating sludge to be dried, and then conveying the sludge to the top of a sludge drying tower through a feeding device so that sludge materials enter the sludge drying tower.
2) The motor of the rotating mechanism in the sludge drying tower is started, and the heat supply system and the ventilation system are started simultaneously, so that the main shaft in the rotating mechanism drives the material stirring rod and the material stirring plate to rotate, the material stirring plate stirs sludge materials to move transversely, and the sludge materials on the large drying plate move towards the center under the action of the material stirring plate and fall down from the center hole of the large drying plate.
3) The sludge material on the large drying disc falls onto the small drying disc, and the sludge material on the small drying disc moves towards the edge under the action of the stirring plate, falls from the edge hole of the small drying disc and falls onto the large drying disc below.
4) The hot air flows upwards from the bottom of the sludge drying tower, the hot air flows upwards from a central hole of the large drying disc and an edge hole of the small drying disc, the sludge material flows downwards, the hot air flows upwards, the hot air flows along the opposite direction of the flow of the sludge material, and the sludge material is dried from bottom to top.
5) The dried sludge material is discharged from the bottom of the sludge drying tower and transported out by a transporting device.
Preferably, the sludge drying tower is composed of a sludge quantitative feeding device, a tower body steel structure, a large drying disc, a small drying disc, a rotating mechanism, a material stirring device, a heat supply system and a ventilation system, wherein the large drying disc and the small drying disc are sequentially distributed in a staggered manner from top to bottom, a central hole is formed in the middle of the large drying disc, and an edge hole is formed in the edge of the small drying disc.
Preferably, the water content in the pretreated sludge material is controlled to be 40-60%, and the temperature of the pretreated sludge material is not lower than 5 ℃.
Preferably, the rotating speed range of the main shaft is 0-1 r/min, and the air induction quantity of the ventilation system is controlled to be 0.5-5 ten thousand m3The wind speed is controlled between 0 and 5m/s, and the heat supply system supplies heat by using hot water or steam with the temperature of 20 to 80 ℃.
Preferably, the main shaft rotates a circle of the kick-out plate to transversely move 50-200 mm.
Preferably, the middle part and the bottom of the top of the inner wall of the sludge drying tower are respectively provided with three temperature and humidity monitoring points, and the temperature of the sludge drying tower is generally monitored at 0-8 ℃, 8-15 ℃ and 15-30 ℃ in winter; the temperature of the sludge drying tower is generally monitored at 20-28 ℃, 28-35 ℃ and 35-40 ℃ in summer; the bottom humidity of the sludge drying tower is controlled to be 20-30%, and the top humidity is controlled to be 40-50%.
(III) advantageous effects
Compared with the prior art, the invention provides a counter-flow type sludge drying process, which has the following beneficial effects:
1. according to the counter-flow sludge drying process, a large number of paving areas are stacked layer by layer, linear turning movement is changed into rotary turning movement, and finally, the effect of paving, airing and drying which is dozens of times of effective land resources is achieved, limited land resources can be utilized, the effect of natural drying which is dozens of times of effective land resources is achieved, and the purpose of saving land resources is achieved.
2. This counter-flow sludge drying technology, the use remains original area of paving, utilize low temperature dry air to air-dry, the cost is lower, normal atmospheric temperature running state, it is not high to mechanical equipment and operating mode requirement, operational environment is comparatively suitable, and the low popularization and use on a large scale of installation condition, the cost of transportation because of the material is transported and is caused has been reduced, the material loss that is difficult to avoid among the material transportation process and the pollution to the environment reach the purpose of environmental protection, the integrated level of complete sets of equipment system is high, production operation and operation ization are strong, high efficiency.
3. The counter-flow sludge drying process adopts top feeding and bottom discharging, so that the sludge drying process has extremely strong continuity and the sludge drying effect is greatly improved.
Drawings
FIG. 1 is a schematic sectional view of a sludge drying tower.
In the figure: 1. a small drying plate; 2. a large drying plate; 3. a material poking rod; 4. a kick-out plate; 5. an air flow trajectory line; 6. a main shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
1) the sludge drying method comprises the steps of pretreating sludge to be dried, controlling the moisture content in the pretreated sludge material to be 40-60%, controlling the temperature of the pretreated sludge material to be not lower than 5 ℃, conveying the sludge to the top of a sludge drying tower through a feeding device, enabling the sludge material to enter the sludge drying tower, wherein the sludge drying tower comprises a sludge quantitative feeding device, a tower body steel structure, large and small drying plates, a rotating mechanism, a material stirring device, a heat supply system and a ventilation system, the large and small drying plates are sequentially distributed in a staggered mode from top to bottom, a central hole is formed in the middle of the large drying plate, and edge holes are formed in the edge of the small drying plate.
2) Starting a motor of a rotating mechanism in the sludge drying tower, and simultaneously starting a heat supply system and a ventilation system to enable a main shaft in the rotating mechanism to drive a material stirring rod and a material stirring plate to rotate, wherein the rotating speed range of the main shaft is 0.5 r/min, the material stirring plate rotates a circle of the main shaft to transversely move 50-200mm, the material stirring plate stirs sludge materials to transversely move, and the sludge materials on the large drying plate move to the center under the action of the material stirring plate and fall from the center hole of the large drying plate.
3) The sludge material on the large drying disc falls onto the small drying disc, and the sludge material on the small drying disc moves towards the edge under the action of the stirring plate, falls from the edge hole of the small drying disc and falls onto the large drying disc below.
4) Hot air flows upwards from the bottom of the sludge drying tower, flows upwards from a central hole of the large drying disc and an edge hole of the small drying disc, sludge materials flow downwards, hot air flows upwards, hot air flows along the opposite direction of the flow of the sludge materials to dry the sludge materials from bottom to top, and the air induction quantity of the ventilation system is controlled to be 1.9 ten thousand meters3The wind speed is controlled to be 0.5m/s, the heat supply system supplies heat by using hot water at the temperature of 60-80 ℃, the middle part and the bottom part of the top part of the inner wall of the sludge drying tower are respectively provided with three temperature and humidity monitoring points, and the temperature of the sludge drying tower is generally monitored at the temperature of 0-8 ℃, 8-15 ℃ and 15-30 ℃ in winter; the temperature of the sludge drying tower is generally monitored at 20-28 ℃ and 28-degree in summer35-40 ℃ at 35 ℃; the bottom humidity of the sludge drying tower is controlled to be 20-30%, and the top humidity is controlled to be 40-50%.
5) The dried sludge material is discharged from the bottom of the sludge drying tower and transported out by a transporting device.
Compared with the prior art, the sludge drying treatment method has the advantages that the occupied land area can be effectively reduced, the purpose of saving land resources is achieved, low-temperature dry air is used for air drying, the normal-temperature running state is realized, and the working environment is suitable.
Example two:
1) the sludge to be dried is pretreated, the water content in the pretreated sludge material is controlled to be 40-60%, the temperature of the pretreated sludge material is not lower than 5 ℃, then the sludge is conveyed to the top of a sludge drying tower through a feeding device, so that the sludge material enters the sludge drying tower, the sludge drying tower is composed of a sludge quantitative feeding device, a tower body steel structure, large and small drying plates, a rotating mechanism, a material stirring device, a heat supply system and a ventilation system, the large and small drying plates are sequentially distributed in a staggered mode from top to bottom, a central hole is formed in the middle of the large drying plate, and the diameter of the small drying plate is smaller than the diameter of the inner wall of the tower body steel structure.
2) Starting a motor of a rotating mechanism in the sludge drying tower, and simultaneously starting a heat supply system and a ventilation system to enable a main shaft in the rotating mechanism to drive a material stirring rod and a material stirring plate to rotate, wherein the rotating speed range of the main shaft is 1 r/min, the material stirring plate rotates for a circle to transversely move for 50-200mm, the material stirring plate stirs sludge materials to transversely move, and the sludge materials on a large drying plate move towards the center under the action of the material stirring plate and fall from a center hole of the large drying plate.
3) The sludge material on the large drying disc falls onto the small drying disc, and the sludge material on the small drying disc moves towards the edge under the action of the stirring plate, falls from the edge hole of the small drying disc and falls onto the large drying disc below.
4) The hot air flows upwards from the bottom of the sludge drying tower, the hot air flows upwards from the central hole of the large drying disc and the edge hole of the small drying disc, the sludge material flows downwards, the hot air flows upwards, and the hot air flows upwardsFlows along the opposite direction of the flow of the sludge material, dries the sludge material from bottom to top, and controls the air induction quantity of a ventilation system to be 4 ten thousand meters3The wind speed is controlled to be 1.5m/s, the heat supply system supplies heat by using steam at the temperature of 110 ℃, the middle part and the bottom of the top of the inner wall of the sludge drying tower are respectively provided with three temperature and humidity monitoring points, and the temperature of the sludge drying tower is generally monitored at 0-8 ℃, 8-15 ℃ and 15-20 ℃ in winter; the temperature of the sludge drying tower is generally monitored at 20-28 ℃, 28-35 ℃ and 35-40 ℃ in summer; the bottom humidity of the sludge drying tower is controlled to be 20-30%, and the top humidity is controlled to be 40-50%.
5) The dried sludge material is discharged from the bottom of the sludge drying tower and transported out by a transporting device.
Compared with the first embodiment, the second embodiment increases the rotation speed of the main shaft of the device, increases the induced air quantity and the wind speed, and uses steam with higher temperature as a heat supply source, so that the drying efficiency is higher than that of the first embodiment, more sludge can be treated in the same time, and the water content of the treated sludge in the two embodiments can reach below 20%.
The invention has the beneficial effects that: a large number of paving areas are stacked layer by layer, linear turning movement is changed into rotary turning movement, effective land resources are utilized to achieve a paving, airing and drying effect which is dozens of times, limited land resources can be utilized, a natural drying effect which is dozens of times is achieved, the aim of saving land resources is achieved, the original paving area is reserved, low-temperature dry air is used for air drying, the cost is low, the normal-temperature running state is achieved, the requirements on mechanical equipment and working conditions are not high, the working environment is suitable, the installation condition is low, the large-scale popularization and use can be achieved, the transportation cost caused by material transfer is reduced, material loss and pollution to the environment which are difficult to avoid in the material conveying process are achieved, the aim of protecting the environment is achieved, the integration degree of the whole equipment system is high, the production operation is strong, the efficiency is high, top feeding is adopted, the bottom discharge can ensure that the sludge drying has extremely strong continuity and the sludge drying effect is greatly improved.
Case problem analysis: the temperature in the sludge drying tower in winter and summer cannot be too high, organic matters in the sludge can be more suitably fermented due to the too high temperature, peculiar smell is easy to generate, the drying speed cannot be accelerated by using external energy due to the too low temperature, and the production operation needs to be controlled by monitoring the temperature and the humidity; if the humidity is approximately normal, the top temperature exceeds the set temperature, and the bottom temperature and humidity are normal, which indicates that the supplemented heat cannot sufficiently absorb the materials, the water discharged by the sludge materials is less, the heat is wasted and discharged, the air inlet amount needs to be reduced, the heat supply temperature needs to be reduced, and the feeding amount needs to be increased, so that the heat can be absorbed; if the bottom temperature is too high and the top temperature is normal, the sludge feeding amount needs to be reduced if the heat required by the sludge is increased; if the temperature is approximately normal, the humidity in the drying tower is too high, and the moisture discharged by the sludge is relatively high, which indicates that the sludge contains large moisture or the dehydration evaporation time is not prolonged, the feeding amount of the sludge material needs to be reduced, the air intake and heat are increased, the matching amount between the sludge and the air is ensured, the moisture in the sludge is exchanged with the dry air in time, and the moisture is dried within the required time.
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 (6)
1. A counter-flow type sludge drying process is characterized by comprising the following steps:
1) pretreating sludge to be dried, and then conveying the sludge to the top of a sludge drying tower through a feeding device so that sludge materials enter the sludge drying tower.
2) The motor of the rotating mechanism in the sludge drying tower is started, and the heat supply system and the ventilation system are started simultaneously, so that the main shaft in the rotating mechanism drives the material stirring rod and the material stirring plate to rotate, the material stirring plate stirs sludge materials to move transversely, and the sludge materials on the large drying plate move towards the center under the action of the material stirring plate and fall down from the center hole of the large drying plate.
3) The sludge material on the large drying disc falls onto the small drying disc, and the sludge material on the small drying disc moves towards the edge under the action of the stirring plate, falls from the edge hole of the small drying disc and falls onto the large drying disc below.
4) The hot air flows upwards from the bottom of the sludge drying tower, the hot air flows upwards from a central hole of the large drying disc and an edge hole of the small drying disc, the sludge material flows downwards, the hot air flows upwards, the hot air flows along the opposite direction of the flow of the sludge material, and the sludge material is dried from bottom to top.
5) The dried sludge material is discharged from the bottom of the sludge drying tower and transported out by a transporting device.
2. The counter-flow sludge drying process according to claim 1, wherein the sludge drying tower is composed of a sludge quantitative feeding device, a tower body steel structure, large and small drying plates, a rotating mechanism, a material stirring device, a heat supply system and a ventilation system, the large and small drying plates are distributed in a staggered manner from top to bottom, a central hole is formed in the middle of the large drying plate, and the diameter of the small drying plate is smaller than that of the inner wall of the tower body steel structure.
3. The counter-flow sludge drying process as claimed in claim 1, wherein the water content in the pretreated sludge material is controlled to be 40-60%, and the temperature of the pretreated sludge material is not lower than 5 ℃.
4. The counter-flow sludge drying process of claim 1, wherein the rotation speed of the main shaft is 0-1 r/min, and the air induction amount of the ventilation system is controlled to be 0.5-5 ten thousand m3The wind speed is controlled between 0 and 5m/s, and the heat supply system supplies heat by using hot water or steam with the temperature of 20 to 80 ℃.
5. The counter-flow sludge drying process of claim 1 wherein the main shaft rotates one circle of the material-shifting plate to move 50-200mm transversely.
6. The counter-flow sludge drying process of claim 1, wherein the top, middle and bottom of the inner wall of the sludge drying tower are respectively provided with three temperature and humidity monitoring points, and the temperature monitoring of the sludge drying tower is generally carried out at 0-8 ℃, 8-15 ℃ and 15-30 ℃ in winter; the temperature of the sludge drying tower is generally monitored at 20-28 ℃, 28-35 ℃ and 35-40 ℃ in summer; the bottom humidity of the sludge drying tower is controlled to be 20-30%, and the top humidity is controlled to be 40-50%.
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| CN202011624964.5A CN112744997A (en) | 2020-12-31 | 2020-12-31 | Counter-flow type sludge drying process |
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| CN202011624964.5A CN112744997A (en) | 2020-12-31 | 2020-12-31 | Counter-flow type sludge drying process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105087A (en) * | 2021-05-24 | 2021-07-13 | 安徽建筑大学 | Normal-temperature ventilation type sludge deep dehydration drying method and device |
| CN115959810A (en) * | 2022-12-05 | 2023-04-14 | 华北电力大学（保定） | Device for drying municipal sludge by indirect air cooling natural ventilation counter-flow cooling tower |
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| JP2000035280A (en) * | 1998-07-15 | 2000-02-02 | Matsushita Electric Ind Co Ltd | Dehydrating dryer |
| CN203319839U (en) * | 2013-07-02 | 2013-12-04 | 四川高通环保科技股份有限公司 | Vertical rotating plate sludge drying device |
| CN203999309U (en) * | 2014-08-07 | 2014-12-10 | 洛阳佳一机电设备有限公司 | A kind of sludge turning is thrown drying installation |
| CN107741135A (en) * | 2017-10-25 | 2018-02-27 | 长沙德科投资管理咨询有限公司 | A kind of eight-angle drier of cooking stove baking |
| CN111905651A (en) * | 2020-09-09 | 2020-11-10 | 上海康恒环境股份有限公司 | Vertical sludge drying and granulating integrated machine |
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2020
- 2020-12-31 CN CN202011624964.5A patent/CN112744997A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| JP2000035280A (en) * | 1998-07-15 | 2000-02-02 | Matsushita Electric Ind Co Ltd | Dehydrating dryer |
| CN203319839U (en) * | 2013-07-02 | 2013-12-04 | 四川高通环保科技股份有限公司 | Vertical rotating plate sludge drying device |
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| Title |
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| 张宝军等: "《水处理工程技术》", 31 January 2015, 重庆大学出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105087A (en) * | 2021-05-24 | 2021-07-13 | 安徽建筑大学 | Normal-temperature ventilation type sludge deep dehydration drying method and device |
| CN115959810A (en) * | 2022-12-05 | 2023-04-14 | 华北电力大学（保定） | Device for drying municipal sludge by indirect air cooling natural ventilation counter-flow cooling tower |
| CN115959810B (en) * | 2022-12-05 | 2024-03-01 | 华北电力大学（保定） | Device for drying municipal sludge by indirect air cooling natural ventilation countercurrent cooling tower |
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