CN106904812B - Process method for drying oil sand mature fine tailings - Google Patents
Process method for drying oil sand mature fine tailings Download PDFInfo
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- CN106904812B CN106904812B CN201710190170.4A CN201710190170A CN106904812B CN 106904812 B CN106904812 B CN 106904812B CN 201710190170 A CN201710190170 A CN 201710190170A CN 106904812 B CN106904812 B CN 106904812B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000001035 drying Methods 0.000 title claims abstract description 31
- 239000003027 oil sand Substances 0.000 title claims abstract description 26
- 239000010802 sludge Substances 0.000 claims abstract description 96
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims description 26
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 10
- 239000002918 waste heat Substances 0.000 abstract description 5
- 239000010865 sewage Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000002028 Biomass Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 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)
- Treatment Of Sludge (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a process method for drying oil sand cured fine tailings, and relates to the field of treatment of oil sludge in an oil refinery, oil sand cured fine tailings and sludge in a sewage treatment plant. The multi-layer rotary drying machine is composed of a plurality of devices which take a multi-layer rotary drying machine as a main structural unit, a rotating shaft is longitudinally arranged at the center of the multi-layer rotary drying machine, grid plates which are uniformly stacked and arranged in parallel and perpendicular to the rotating shaft penetrate through the multi-layer rotary drying machine, the grid plates are of special structures, sludge can be conveyed in a rotary mode through stirring wings on the grid plates, and therefore the sludge and the sludge are uniformly distributed and heated on the grid plates, and stable drying is achieved. The method adopts a superheated steam direct heating mode to dry the oil sand tailings, the oil sludge and the sludge, can recover waste heat, realizes a direct contact type drying technology which is safe and stable in operation, and has great practical value and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a process method for drying oil sand mature fine tailings.
Background
The oil sands industry has been concerned primarily with the extraction of asphaltenes from oil sands. With the concern of people on environmental problems, pollution such as tailings, waste water, waste gas and the like generated in the oil sand industry gradually becomes a key problem restricting the development of the oil sand industry. Therefore, various oil sand contaminant remediation technologies are entering the development phase into the 21 st century.
The classification is carried out according to the process principle, and the existing oil sand tailings treatment technology can be mainly divided into the following five major categories: 1) Physical/mechanical processing techniques; 2) Natural treatment technology; 3) Chemical/biological repair techniques; 4) Mixture/combination treatment techniques; 5) A permanent storage technique; in the above five technical methods, the physical/mechanical processing technology is still in the research and application verification stage, and commercial large-scale application is not realized. Other four technologies have certain commercial scale application examples, but all have certain problems in the application process. The problems in the existing commercial tailings disposal technology are as follows:
in summary, there is a need to overcome the drawbacks of the conventional commercial tailings treatment technology and obtain a new sludge treatment process, so as to achieve the purpose of effectively utilizing energy and obtaining dry oil sand tailings, oil sludge and sludge under more economic process conditions.
Disclosure of Invention
Aiming at the problems of the background art, the invention discloses a process method for drying oil sand cured fine tailings, and relates to the field of treatment of oil sludge in an oil refinery, oil sand cured fine tailings and sludge in a sewage treatment plant. The waste heat is recovered, and the direct contact type drying technology which is safe and operates stably is realized. The oil sand tailings, oil sludge and sludge are dried by adopting a superheated steam direct heating mode. The method mainly comprises the following structural units of the multilayer rotary dryer:
multi-layer rotary drier
The multilayer rotary dryer is of a closed structure, a rotating shaft is longitudinally arranged at the inner center position of the multilayer rotary dryer, grid plates which are uniformly stacked and arranged in parallel are vertically and fixedly connected with the rotating shaft, one end of each grid plate is close to the inner wall of the multilayer rotary dryer, the other end of each grid plate is a free end, and the free ends of two adjacent grid plates are positioned on two opposite sides of the rotating shaft; the end part of the free end is provided with a retaining weir in the vertical direction, a gap between the retaining weir and the inner wall of the multilayer rotary dryer is an overflow port, holes with stirring wings are symmetrically and uniformly distributed on the grid disc by taking the rotating shaft as a center, and the inclination angle of the stirring wings to the rotating shaft direction is an acute angle.
In the technical scheme, a sludge raw material inlet is formed in the side wall of the top of the multilayer rotary dryer, and the sludge raw material inlet is connected with a sludge discharging hopper through a pipeline.
In the technical scheme, a high-temperature steam inlet is also formed in the side wall, opposite to the sludge raw material inlet, of the multilayer rotary dryer; the high-temperature steam inlet is connected with the heat exchanger through a pipeline.
In the technical scheme, a dried sludge outlet is formed in the bottom of the multilayer rotary dryer; the dry sludge leading-out port is communicated with the dry sludge storage tank through a pipeline.
In the technical scheme, a steam outlet is arranged on the side wall of the bottom of the multilayer rotary dryer; the steam outlet is connected with the bottom of the cyclone separator and the bottom of the heat exchanger in sequence through pipelines.
In the technical scheme, the top of the heat exchanger is provided with a high-temperature steam inlet, and the bottom of the heat exchanger is provided with a low-temperature steam outlet.
Secondly, the process flow is as follows:
the sludge raw material to be treated enters the multilayer rotary dryer through the sludge discharge hopper and the sludge raw material inlet, is fully mixed with the superheated steam introduced from the high-temperature steam inlet through the rotating stirring wings and then is conveyed downwards in the continuous stirring process, specifically, the sludge raw material to be treated is dried by directly contacting with the circulating superheated steam, is conveyed to the lower stirring wings from the upper stirring wings while being dried, is finally discharged into the dried sludge storage tank from the lowermost dried sludge guide outlet, and is dried to be led out through the induced draft fan. The sludge raw material is horizontally conveyed to one end of the first-layer grid disc along with the rotation of the rotating shaft. The sludge raw material is conveyed to the next grid plate through an overflow port vertically arranged on the first grid plate in the vertical direction; the interception weir can prevent the sludge raw material on the grid plate from being thrown to the machine wall of the multilayer rotary dryer due to centrifugal force in the rotating process, and the sludge raw material cannot vertically move downwards from the hole but downwards to the next grid plate along the overflow port due to the centrifugal force generated by rotation and the blockage of the interception weir and the stirring wing.
On the other hand, the cyclone separator is arranged for collecting oil sludge or oil sand carried in the discharged steam, and the oil sludge or oil sand collected at the bottom of the cyclone separator is discharged into a dry sludge storage tank; the heat exchanger is arranged to exchange heat with high-temperature steam, so that the high-temperature steam reaches the steam working temperature for the multilayer rotary dryer, and meanwhile, the temperature of the discharged low-temperature steam is increased after heat exchange, and the steam heat energy is fully utilized.
3. The characteristics of the process
1) The direct heating mode of the superheated steam has the advantages that: the process is stable, and the drying with the water content of below 10 percent is easy to realize; the direct contact with the superheated steam is safe, and the burning of the oil-containing silt can be prevented; the specific heat is large, and the efficiency is high; the superheated steam used for drying circulates between the dryer and the steam heater, and the process is simple, easy to operate, free of a boiler and easy to maintain.
2) The multilayer structure has the advantages that: the internal grid plate is of a special structure, so that the stirring wings on the grid plate can convey sludge in a rotary mode, therefore, the sludge and the sludge are uniformly distributed and heated on the grid plate, the adhesion of the sludge on a heat transfer surface and the scorching failure can be avoided, and the drying can be stably carried out.
3) Oil gas and odor components are decomposed: the water vapor containing oil gas and odor in the drying process can be incinerated and decomposed by a subsequent heat source furnace. In addition, since the operation is performed under negative pressure, odor does not leak.
4) The fuel value of the dried oil sludge and sludge is high: since the superheated steam (normal pressure) is brought into direct contact with the sludge, the dried sludge having a water content of 10% or less can be stably obtained while retaining the fuel component in the sludge or sludge.
5) Low temperature waste heat can be utilized: since the multi-layer rotary drying system is a system that dries sludge for a long time while stirring, it is possible to effectively use low-temperature heat sources such as waste heat of factories as a drying heat source.
6) And (3) reducing the environmental load: the exhaust steam generated in the drying process belongs to the evaporated moisture in the sludge and part of the air leaked into the system, so that the processing load of the exhaust steam containing odor components can be reduced.
The invention has the innovative characteristics that:
1) Ensuring stable supply of biomass fuel: by continuously receiving sewage sludge, stable supply of biomass fuel having a high fuel value can be ensured.
2) The energy is effectively utilized: when the waste heat (250-350 ℃) of a factory is utilized, the unused energy can be effectively utilized, and the biomass fuel with new energy value is created. And further contributes to prevention of global warming by using the biomass fuel.
3) And (4) ensuring the yield: the transaction fee of the oil sludge and the sludge is used for replacing the conventional fossil fuel, so that the fee is reduced and the benefit is generated.
4) By this technique, the dehydrated sludge (water content 80%) can be made into dried sludge (water content 10%). The obtained solid substance has high organic component ratio (energy value).
Drawings
FIG. 1: the application of the sewage treatment sludge in a fuel mode is shown in the drawing, wherein: 1. a multi-layer rotary dryer; 2. a sludge discharge hopper; 3. a dry sludge storage tank; 4. a cyclone separator; 5. a heat exchanger.
FIG. 2: the internal structure diagram of the multi-layer rotary drying equipment is shown in the specification, wherein: 101. a rotating shaft; 102. a stirring wing; 103. a grid plate; 104. a retention weir; 105. an overflow port.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way. Any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.
Example 1
The process for drying oil sand mature fine tailings is formed by a plurality of sets of devices with a multi-layer rotary dryer as a main structural unit, and the specific structure of the process is as follows:
the multi-layer rotary dryer comprises a multi-layer rotary dryer 1 which is of a closed structure, wherein a rotating shaft 101 is longitudinally arranged at the inner center of the multi-layer rotary dryer, and a grid plate 103 which is vertical to the rotating shaft 101 and is uniformly stacked and arranged in parallel is penetrated through the grid plate 103, one end of the grid plate 103 is close to the inner wall of the multi-layer rotary dryer 1, the other end of the grid plate is a free end, a retaining weir 104 is arranged at the end part of the free end in the vertical direction, a gap between the retaining weir 104 and the inner wall of the multi-layer rotary dryer 1 is an overflow port 105, holes with stirring wings 102 are symmetrically and uniformly distributed on the grid plate 103 by taking the rotating shaft 101 as the center, and the inclination angle of the stirring wings 102 to the rotating shaft 101 direction is an acute angle. A sludge raw material inlet is arranged on the side wall of the top of the multilayer rotary dryer 1, and the sludge raw material inlet is connected with a sludge discharging hopper 2 through a pipeline; a high-temperature steam inlet is also arranged on the side wall of the multilayer rotary dryer 1 opposite to the sludge raw material inlet; the high-temperature steam inlet is connected with the heat exchanger 5 through a pipeline; a dried sludge outlet is arranged at the bottom of the multilayer rotary dryer 1; the dry sludge leading-out port is communicated with a dry sludge storage tank 3 through a pipeline; a steam outlet is arranged on the side wall of the bottom of the multilayer rotary dryer 1; the steam outlet is connected with the bottom of the cyclone separator 4 and the bottom of the heat exchanger 5 in sequence through pipelines; the top of the heat exchanger 5 is provided with a high-temperature steam inlet, and the bottom of the heat exchanger is provided with a low-temperature steam outlet.
Example 2
The process for drying oil sand mature fine tailings comprises the following steps:
the sludge raw material to be treated enters the multilayer rotary dryer 1 through the sludge discharge hopper 2 and the sludge raw material inlet, is fully mixed with the superheated steam introduced from the high-temperature steam inlet through the rotating stirring wings 102 and then is conveyed downwards in the continuous stirring process, specifically, the sludge raw material to be treated is directly contacted with the circulating superheated steam for drying, is conveyed to the lower stirring wings 102 from the upper stirring wings 102 while being dried, is finally discharged into the dry sludge storage tank 3 from the lowermost dry sludge guide outlet, is dried, and is led out of the dry sludge through the induced draft fan. The sludge material is horizontally conveyed along with the rotation of the rotating shaft 101 on the first grid plate 103 to the end where the interception weir 104 is arranged. The sludge raw material is conveyed to the next grid plate 103 in the vertical direction by vertically arranging an overflow port 105 on the first grid plate 103; the cut-off weir can prevent the sludge on the grid plate 103 from being thrown to the wall of the multilayer rotary dryer 1 due to centrifugal force during the rotation process, and because of the centrifugal force generated by the rotation and the blocking of the cut-off weir and the stirring wings 102, the sludge does not vertically move downwards from the hole, but descends to the next grid plate 103 along the overflow port 105.
On the other hand, the cyclone 4 is arranged to collect oil sludge or oil sand entrained in the exhaust steam, and the oil sludge or oil sand collected at the bottom of the cyclone 4 is discharged into the dry sludge storage tank 3; the heat exchanger 5 is arranged to exchange heat with high-temperature steam, so that the high-temperature steam reaches the steam working temperature for the multilayer rotary dryer 1, and meanwhile, the temperature of the discharged low-temperature steam is increased after heat exchange, and the heat energy of the steam is fully utilized.
According to the sludge inspection method CJ/T221-2005 of the municipal sewage treatment plant, the water content is measured. By the technology, the dewatered oil sludge to be treated with the water content of 80% can be prepared into the dried sludge with the water content of 10%. The solid substance thus obtained has a high proportion of organic components (energy value).
Claims (6)
1. A process method for drying oil sand mature fine tailings is characterized by comprising the following steps: the method comprises a multilayer rotary dryer structural unit:
the multilayer rotary dryer is of a closed structure, a rotating shaft is longitudinally arranged at the center of the multilayer rotary dryer, grid plates which are uniformly stacked and arranged in parallel are vertically and fixedly connected with the rotating shaft, one end of each grid plate is close to the inner wall of the multilayer rotary dryer, the other end of each grid plate is a free end, and the free ends of two adjacent grid plates are positioned on two opposite sides of the rotating shaft; the end part of the free end is provided with an interception weir in the vertical direction, a gap between the interception weir and the inner wall of the multilayer rotary dryer is an overflow port, holes with stirring wings are symmetrically and uniformly distributed on the grid disc by taking the rotating shaft as the center, and the inclination angle of the stirring wings to the rotating shaft direction is an acute angle;
and a sludge raw material inlet is arranged on the side wall of the top of the multilayer rotary dryer and is connected with a sludge discharge hopper through a pipeline.
2. The process for drying oil sand mature fine tailings of claim 1 wherein: a high-temperature steam inlet is also formed in the side wall, opposite to the sludge raw material inlet, of the multilayer rotary dryer; the high-temperature steam inlet is connected with the heat exchanger through a pipeline.
3. The process for drying oil sand mature fine tailings of claim 1 wherein: a dried sludge outlet is arranged at the bottom of the multilayer rotary dryer; the dry sludge leading-out port is communicated with the dry sludge storage tank through a pipeline.
4. The process for drying oil sand mature fine tailings of claim 1 wherein: a steam outlet is arranged on the side wall of the bottom of the multilayer rotary dryer; the steam outlet is connected with the bottom of the cyclone separator and the bottom of the heat exchanger in sequence through pipelines.
5. The process for drying oil sand mature fine tailings of claim 4, wherein: the top of the heat exchanger is provided with a high-temperature steam inlet, and the bottom of the heat exchanger is provided with a low-temperature steam outlet.
6. The process for drying oil sand mature fine tailings of claim 1, wherein: the method comprises the following technical processes:
the sludge raw material to be treated enters a multilayer rotary dryer through a sludge discharge hopper and a sludge raw material inlet, is fully mixed with the superheated steam introduced from the high-temperature steam inlet through a rotary stirring wing, and is conveyed downwards in the continuous stirring process;
directly contacting a sludge raw material to be treated with circulating superheated steam for drying, drying while conveying the sludge raw material to a lower stirring wing from an upper stirring wing, finally discharging the sludge raw material to a dried sludge storage tank from a lowermost dried sludge guide outlet to obtain dried sludge, and leading out the dried sludge through an induced draft fan;
the sludge raw material is horizontally conveyed to one end provided with a trapping weir on the first layer of grid disc along with the rotation of the rotating shaft;
the sludge raw material is conveyed to the next grid plate through an overflow port vertically arranged on the first grid plate in the vertical direction.
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| CN201710190170.4A CN106904812B (en) | 2017-03-27 | 2017-03-27 | Process method for drying oil sand mature fine tailings |
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| CN106904812B true CN106904812B (en) | 2023-04-18 |
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|---|---|---|---|---|
| JPH05261201A (en) * | 1992-03-19 | 1993-10-12 | Kakiuchi:Kk | Method for drying high moisture material and equipment therefor |
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| JP2001201260A (en) * | 2000-01-19 | 2001-07-27 | Kono Plant Kogyo Kk | Method and apparatus for drying grain |
| CN101759344A (en) * | 2010-01-22 | 2010-06-30 | 西安长庆科技工程有限责任公司 | Oil field oil sludge drying treatment combined device and oil sludge drying treatment technique |
| CN101830624A (en) * | 2010-06-09 | 2010-09-15 | 山东天力干燥设备有限公司 | System and process for drying sludge blades |
| CN103043878A (en) * | 2011-10-13 | 2013-04-17 | 上海麦风微波设备有限公司 | Microwave energy-saving drying method and apparatus for sludge and coal slime |
| CN203683344U (en) * | 2014-01-08 | 2014-07-02 | 伟明环保设备有限公司 | Circular disk type sludge dryer |
| CN203904307U (en) * | 2014-06-13 | 2014-10-29 | 江西友尼宝农业科技开发有限公司 | Evaporation machine with top-end heating device |
| CN105254147A (en) * | 2015-10-21 | 2016-01-20 | 南昌航空大学 | Triple utilization device and method for exhaust steam waste heat produced during superheat steam drying of sludge |
| CN205373388U (en) * | 2016-03-04 | 2016-07-06 | 衢州市煜鑫农产品加工技术开发有限公司 | A screw feeder for hot air drying device |
-
2017
- 2017-03-27 CN CN201710190170.4A patent/CN106904812B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05261201A (en) * | 1992-03-19 | 1993-10-12 | Kakiuchi:Kk | Method for drying high moisture material and equipment therefor |
| CN2270952Y (en) * | 1996-06-21 | 1997-12-17 | 沈善明 | Deflecting trough plate type heating mixing dryer |
| JP2001201260A (en) * | 2000-01-19 | 2001-07-27 | Kono Plant Kogyo Kk | Method and apparatus for drying grain |
| CN101759344A (en) * | 2010-01-22 | 2010-06-30 | 西安长庆科技工程有限责任公司 | Oil field oil sludge drying treatment combined device and oil sludge drying treatment technique |
| CN101830624A (en) * | 2010-06-09 | 2010-09-15 | 山东天力干燥设备有限公司 | System and process for drying sludge blades |
| CN103043878A (en) * | 2011-10-13 | 2013-04-17 | 上海麦风微波设备有限公司 | Microwave energy-saving drying method and apparatus for sludge and coal slime |
| CN203683344U (en) * | 2014-01-08 | 2014-07-02 | 伟明环保设备有限公司 | Circular disk type sludge dryer |
| CN203904307U (en) * | 2014-06-13 | 2014-10-29 | 江西友尼宝农业科技开发有限公司 | Evaporation machine with top-end heating device |
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