CN113402136B - Oil-containing sludge screening and heat washing combined pretreatment method and device - Google Patents
Oil-containing sludge screening and heat washing combined pretreatment method and device Download PDFInfo
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- CN113402136B CN113402136B CN202110675978.8A CN202110675978A CN113402136B CN 113402136 B CN113402136 B CN 113402136B CN 202110675978 A CN202110675978 A CN 202110675978A CN 113402136 B CN113402136 B CN 113402136B
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- oily sludge
- hot washing
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- 238000005406 washing Methods 0.000 title claims abstract description 95
- 239000010802 sludge Substances 0.000 title claims abstract description 65
- 238000012216 screening Methods 0.000 title claims abstract description 40
- 238000002203 pretreatment Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000002198 insoluble material Substances 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 239000010865 sewage Substances 0.000 claims abstract description 5
- 230000001020 rhythmical effect Effects 0.000 claims abstract description 3
- 238000001125 extrusion Methods 0.000 claims description 59
- 239000002245 particle Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 4
- 238000003795 desorption Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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
Landscapes
- 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)
Abstract
The application belongs to the technical field of oil-containing sludge treatment, and particularly relates to a screening and hot washing combined pretreatment method and device for oil-containing sludge. According to the oil-containing sludge screening and heat washing combined pretreatment method, material screening is implemented in a heat washing cavity, a screw conveyor is arranged in the heat washing cavity, and sieve holes are formed in a screw conveyor shell so that heat washing liquid in the heat washing cavity can enter the screw conveyor shell through the sieve holes, and two ends of the screw conveyor shell are respectively provided with a feeding end and a discharging end; the spiral blade of the spiral conveyor rolls and scrapes the inner wall of the spiral conveyor shell in a rhythmic way while pushing the oily sludge to move forward, the oily sludge is dissolved in the hot washing liquid and enters the hot washing cavity along with the oily sewage through the sieve holes, and insoluble materials are led out from the discharge end of the spiral conveyor shell. The spiral conveyor is combined into the hot washing process, so that the space is saved, the hot washing effect is improved, and the sieve holes are not easy to block.
Description
Technical Field
The application belongs to the technical field of oil-containing sludge treatment, and particularly relates to a screening and hot washing combined pretreatment method and device for oil-containing sludge.
Background
The oil-containing sludge mainly comes from petroleum exploration, exploitation and refining processes. The prior art often uses a thermal desorption process to treat the oily sludge. For the oily sludge with higher oil content and/or liquid content, a hot washing process is usually adopted, crushing and/or screening impurity removing steps are needed before hot washing, for example, a desorption treatment method and a device thereof using flue gas indirect heating are disclosed in Chinese patent document CN 108795464A, the method comprises five steps of crushing, hot washing, thermal desorption, oil gas treatment and ash treatment, and a stirring shaft is arranged for stirring during hot washing. And as disclosed in Chinese patent document CN 110606633A, the treatment method and the treatment system for recycling and reducing the oil-containing sludge are provided with screening and impurity removing steps between crushing and hot washing. In the prior art, the screening and hot washing steps are generally carried out sequentially.
Disclosure of Invention
The application aims to overcome the defects of the prior art, and provides a screening and hot washing combined pretreatment method and device for oily sludge, which can simultaneously complete the screening and hot washing steps, is not easy to block screen holes, and is beneficial to improving the hot washing effect.
In order to achieve the above object, the technical scheme of the present application is as follows:
the combined pretreatment method for screening and hot washing of the oily sludge comprises the steps that material screening is implemented in a hot washing cavity, a screw conveyor is arranged in the hot washing cavity, sieve holes are formed in a screw conveyor shell, so that hot washing liquid in the hot washing cavity can enter the screw conveyor shell through the sieve holes, and two ends of the screw conveyor shell are respectively provided with a feeding end and a discharging end; the spiral blade of the spiral conveyor rolls and scrapes the inner wall of the spiral conveyor shell in a rhythmic way while pushing the oily sludge to move forward, the oily sludge is dissolved in the hot washing liquid and enters the hot washing cavity along with the oily sewage through the sieve holes, and insoluble materials are led out from the discharge end of the spiral conveyor shell.
The application combines screening into a hot washing process, thereby saving space and time. Compared with the intermittent centralized treatment mode of the oily sludge, the running water type sequential treatment mode ensures that each part of the oily sludge can be fully rolled and dissolved, and insoluble materials mixed in the oily sludge continuously stir the oily sludge, so that the heat washing effect is relatively good. On the other hand, because the oil sludge has viscosity, under the combined action of insoluble materials with proper particle size, the sieve holes are very easy to be blocked. As the helical blades rotate, the tips of the helical blades rhythmically crush and scrape the inner wall of the screw conveyor housing, causing insoluble material to be unable to clog the screen holes.
As an improvement, the helical blade of the screw conveyor is 0-10mm away from the inner wall of the screw conveyor shell.
As an improvement, the screw conveyor shell is driven by a shell driving motor, so that the screw conveyor shell can rotate. After the spiral conveyer shell rotates, the sieve holes are circulated from low to high continuously, and repeatedly washed by hot washing liquid, so that the dredging and blocking prevention of the sieve holes are facilitated.
As a further improvement, the rotating direction of the screw conveyor shell is opposite to the rotating direction of the screw blade in the screw conveyor, so that the rolling effect on the oil-containing sludge at the inner wall of the screw conveyor shell is improved.
As an improvement, the liquid level of the hot washing liquid is higher than the bottom of the screw conveyor shell, and the hot washing liquid can also dip all oily sludge.
As a further improvement, the oily sludge is pre-screened below the feed end of the screw conveyor housing. One of the functions of pre-screening is to prevent bulky insoluble material from entering the screw conveyor.
As a further improvement, the pre-screening adopts a rotary extrusion feeding part, the oil-containing sludge is extruded into the inside of the screw conveyor shell, and large-particle materials with particle sizes larger than the limiting particle size are discharged out of the screw conveyor shell. On the one hand, the rotary extrusion feeding ensures the particle size of the materials in the screw conveyor, and most importantly, the solid oily sludge is extruded into the screw conveyor in an extrusion mode, the extrusion action is beneficial to the dispersion of the materials, and the hot washing effect is improved.
As a still further improvement, the rotary extrusion feeding part is a part of a screw conveyer shell, a grid is arranged on the rotary extrusion feeding part, a rotary feeding cavity is arranged outside the rotary extrusion feeding part, a large material outlet is arranged on the rotary feeding cavity, and the rotary extrusion feeding part rotates to enable the oily sludge to realize extrusion feeding between the inner wall of the rotary feeding cavity and the outer wall of the rotary extrusion feeding part. The rotatory grid plays the effect of cutting the particulate matter, and when oily mud fell in the grid bottom, the grid bottom was carried out the rolling to the material with rotatory feed chamber bottom, was extruded the material simultaneously between the grid.
As a further improvement, the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes auxiliary extrusion of the oily sludge.
As a further improvement, the screw blade is fixed on the screw conveying shaft, and the hot washing liquid sprays the material internally through a hot washing liquid channel arranged in the screw conveying shaft. The internal spraying is not only beneficial to dispersing materials, but also beneficial to reducing the adhesion of viscous oil sludge to the spiral blade.
As an improvement, the hot washing liquid is heated by a heating coil.
The application also provides a device adopting the pretreatment method.
The oil-containing sludge screening and heat washing combined pretreatment device comprises a heat washing cavity, wherein a screw conveyer is arranged in the heat washing cavity, and a sieve pore is formed in a screw conveyer shell so that heat washing liquid in the heat washing cavity can enter the screw conveyer shell through the sieve pore, and two ends of the screw conveyer shell are respectively provided with a feeding end and a discharging end; the spiral blade of the spiral conveyor rolls and scrapes the inner wall of the spiral conveyor shell while pushing the oily sludge to move forward, the oily sludge is dissolved in hot washing liquid and enters the hot washing cavity along with the oily sewage through the sieve holes, and insoluble materials are led out from the discharge end of the spiral conveyor shell.
As an improvement, the screw conveyor housing and the screw blade are driven by different motors.
As an improvement, a pre-screening component is arranged below the feeding end of the screw conveyor shell.
As a further improvement, the pre-screening means is a rotary extrusion feed means.
As a further improvement, the rotary extrusion feeding part is a part of a screw conveyer shell, a grid is arranged on the rotary extrusion feeding part, a rotary feeding cavity is arranged outside the rotary extrusion feeding part, a large material outlet is arranged on the rotary feeding cavity, and the rotary extrusion feeding part rotates to enable the oily sludge to be extruded and fed between the inner wall of the rotary feeding cavity and the outer wall of the rotary extrusion feeding part.
As an improvement, the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes auxiliary extrusion of the oily sludge.
As a further improvement, the spiral blade is fixed on the spiral conveying shaft, and the hot washing liquid sprays the materials internally through a hot washing liquid channel arranged in the spiral conveying shaft.
In summary, the spiral conveyor is combined into the hot washing process, so that the space is saved, the hot washing effect is improved, the inner wall of the spiral conveyor shell is rolled and scraped regularly by the edges of the spiral blades, the blocking of the material on the sieve holes is solved, the two working procedures are organically combined, the stirring of the insoluble material is beneficial to improving the hot washing effect of the oil-containing sludge, and the screening of the insoluble material after the hot washing is also beneficial to the screening of the insoluble material due to the small viscosity.
Drawings
FIG. 1 is a schematic view of the structure of the present application, with wavy lines at the bottom of the screw conveyor housing showing the level of hot wash liquid;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, with the wavy line above the heating coil indicating the level of hot rinse solution;
FIG. 3 is a schematic view of the structure of the rotary extrusion feeding part of the present application;
FIG. 4 is a cross-sectional view taken along B-B in FIG. 1;
fig. 5 is a schematic view of the structure of the conveying screw of the present application.
In the figure: 10. a heat washing cavity; 11. a heating coil; 12. a cleaning liquid replenishing pipe; 21. a screw conveyor housing; 22. the shell drives the motor; 23. a conveying screw; 24. a screw conveying motor; 25. a feed end; 26. a discharge end; 27. a feeding bin; 28. a helical blade; 29. a screw conveying shaft; 30. rotating the extrusion feed member; 31. a grille; 32. extruding a screw; 33. rotating the feed chamber; 34. and a large material outlet.
Detailed Description
Example 1
The combined pretreatment method for screening and hot washing of the oil-containing sludge ensures that the screening of materials is implemented in a hot washing cavity, and realizes hot washing operation while finishing the screening.
Specific pretreatment methods and apparatus as shown in fig. 1, a screw conveyor is provided above the hot wash chamber 10, the screw conveyor comprising a screw conveyor housing 21 and a conveyor screw 23. The screw conveyor housing 21 is driven by a housing driving motor 22 so that the screw conveyor housing 21 can rotate. The conveying screw 23 is driven by a screw conveying motor 24 to rotate the conveying screw 23 so as to realize a material conveying function. The direction of rotation of the screw conveyor housing 21 may be the same or opposite to the direction of rotation of the screw blades in the screw conveyor. If the screw conveyor housing 21 rotates in the same direction as the screw blades, the rotational speeds of the two are different. The screw blades of the screw conveyor are spaced 0-10mm from the inner wall of the screw conveyor housing 21.
As shown in fig. 1 and 2, the level of the hot washing liquid in the hot washing chamber 10 is higher than the bottom of the screw conveyor housing 21. The screw conveyor housing 21 is provided with mesh openings so that the hot washing liquid in the hot washing chamber 1 can enter the interior of the screw conveyor housing 21 through the mesh openings 22. The level of the hot wash liquid is preferably 1/3 to 1/2 of the level of the submerged screw conveyor housing 21. A heating coil 11 is arranged in the hot washing cavity 10 and is used for heating the hot washing liquid. The bottom of the hot washing cavity 10 is obliquely arranged, and the bottom of the hot washing cavity 10 is provided with a cleaning liquid supplementing pipe 12 for supplementing the hot washing liquid in the hot washing cavity 10.
The screw conveyer casing 21 both ends set up feed end 25 and discharge end 26 respectively, and the top of feed end 25 sets up feeding storehouse 27. When the oily sludge containing impurities enters the screw conveyor housing 21 through the feed end 25, the oily sludge is first pre-screened at the feed end 25.
The pre-screening employs a rotary extrusion feed member 30, the rotary extrusion feed member 30 being part of the screw conveyor housing 21, the rotary extrusion feed member 30 being located below the feed end 25. As shown in fig. 3, a grid 31 is provided on the rotary extrusion feeding member 30, an extrusion screw 32 is provided on the rotary extrusion feeding member 30, the extrusion screw 32 is a screw section provided at intervals of 2 sections, and when the oily sludge enters between the 2 screw sections, the rotation of the screw section realizes the auxiliary extrusion of the oily sludge. The rotary extrusion feeding member 30 is provided with a rotary feeding chamber 33. As shown in fig. 4, the rotary feed chamber 33 is provided with a large material outlet 34. Rotation of the rotary extrusion feed member 30 causes the oleaginous sludge to effect extrusion feed between the inner wall of the rotary feed cavity 33 and the outer wall of the rotary extrusion feed member 30. Due to the presence of the rotary extrusion feed member 30, the oily sludge is extruded from the grate 31 into the interior of the screw conveyor housing 21, and large particulate material having a particle size larger than the defined particle size is discharged from the large material outlet 34 out of the screw conveyor housing 21.
The spiral blades of the screw conveyor roll and scrape the inner wall of the screw conveyor housing 21 rhythmically while pushing the oily sludge forward, the oily sludge is dissolved in the hot washing liquid and enters the hot washing cavity along with the oily water through the sieve holes, and the insoluble material is led out from the discharge end 26 of the screw conveyor housing 21.
As shown in fig. 5, the conveying screw 23 includes a screw blade 28 and a screw conveying shaft 29. The screw blade 28 is fixed on the screw conveying shaft 29, the screw conveying shaft 29 is a hollow rod-shaped object with 2 parallel arranged, the surface of the screw conveying shaft 29 is provided with injection holes, and a hot washing liquid channel is formed by a hollow channel in the screw conveying shaft 29 and the injection holes. The hot wash liquid is internally sprayed to the material through the hot wash liquid channel.
Claims (10)
1. The combined pretreatment method for screening and heat washing of the oily sludge is characterized by comprising the following steps of: the material screening is implemented in the hot washing cavity, a screw conveyor is arranged in the hot washing cavity, and sieve holes are formed in a screw conveyor shell so that hot washing liquid in the hot washing cavity can enter the screw conveyor shell through the sieve holes, and two ends of the screw conveyor shell are respectively provided with a feeding end and a discharging end; the spiral conveyor shell is driven by a shell driving motor, so that the spiral conveyor shell can rotate; the conveying screw is driven by a screw conveying motor; the spiral blades of the spiral conveyor roll and scrape the inner wall of the spiral conveyor shell in a rhythmic manner while pushing the oily sludge to advance, the oily sludge is dissolved in hot washing liquid and enters the hot washing cavity along with the oily sewage through the sieve holes, and insoluble materials are led out from the discharge end of the spiral conveyor shell; the oily sludge passes through pre-screening below the feeding end of the screw conveyor shell, the pre-screening adopts a rotary extrusion feeding component, the oily sludge is extruded into the screw conveyor shell, and large-particle materials with particle sizes larger than the limiting particle size are discharged out of the screw conveyor shell; the rotary extrusion feeding part is a part of the screw conveyor shell, a grid is arranged on the rotary extrusion feeding part, the rotary extrusion feeding part is positioned inside the rotary feeding cavity, a large material outlet is arranged on the rotary feeding cavity, and the rotary extrusion feeding part rotates to enable the oily sludge to be extruded and fed between the inner wall of the rotary feeding cavity and the outer wall of the rotary extrusion feeding part.
2. The combined pretreatment method for screening and heat washing of oily sludge according to claim 1, which is characterized in that: the helical blade of the screw conveyor is 0-10mm away from the inner wall of the screw conveyor shell.
3. The combined pretreatment method for screening and heat washing of oily sludge according to claim 1, which is characterized in that: the rotating direction of the screw conveyor shell is opposite to the rotating direction of the screw blade in the screw conveyor.
4. The combined pretreatment method for screening and heat washing of oily sludge according to claim 1, which is characterized in that: the level of the hot washing liquid is higher than the bottom of the screw conveyor housing.
5. The combined pretreatment method for screening and heat washing of oily sludge according to claim 1, which is characterized in that: and the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes auxiliary extrusion of the oily sludge.
6. The combined pretreatment method for screening and heat washing of oily sludge according to claim 1, which is characterized in that: the spiral blade is fixed on the spiral conveying shaft, and the hot washing liquid is sprayed into the material through a hot washing liquid channel arranged in the spiral conveying shaft.
7. The combined pretreatment method for screening and heat washing of oily sludge according to claim 1, which is characterized in that: the hot wash liquor is heated by a heating coil.
8. Oil-containing sludge screening and heat washing combined pretreatment device comprises a heat washing cavity, and is characterized in that: the spiral conveyor is arranged in the hot washing cavity, the spiral conveyor shell and the spiral blades are driven by different motors, and sieve holes are formed in the spiral conveyor shell, so that hot washing liquid in the hot washing cavity can enter the spiral conveyor shell through the sieve holes, and the two ends of the spiral conveyor shell are respectively provided with a feeding end and a discharging end; the spiral blade of the spiral conveyor rolls and scrapes the inner wall of the spiral conveyor shell while pushing the oily sludge to move forward, the oily sludge is dissolved in hot washing liquid and enters the hot washing cavity along with the oily sewage through the sieve holes, and insoluble materials are led out from the discharge end of the spiral conveyor shell; a pre-screening part is arranged below the feeding end of the spiral conveyor shell, and the pre-screening part is a rotary extrusion feeding part; the rotary extrusion feeding part is a part of the screw conveyor shell, a grid is arranged on the rotary extrusion feeding part, the rotary extrusion feeding part is positioned inside the rotary feeding cavity, a large material outlet is arranged on the rotary feeding cavity, and the rotary extrusion feeding part rotates to enable the oily sludge to be extruded and fed between the inner wall of the rotary feeding cavity and the outer wall of the rotary extrusion feeding part.
9. The oil-containing sludge screening and heat washing combined pretreatment device according to claim 8, wherein: and the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes auxiliary extrusion of the oily sludge.
10. The oil-containing sludge screening and heat washing combined pretreatment device according to claim 8, wherein: the spiral blade is fixed on the spiral conveying shaft, and the hot washing liquid is sprayed into the material through a hot washing liquid channel arranged in the spiral conveying shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675978.8A CN113402136B (en) | 2021-06-17 | 2021-06-17 | Oil-containing sludge screening and heat washing combined pretreatment method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675978.8A CN113402136B (en) | 2021-06-17 | 2021-06-17 | Oil-containing sludge screening and heat washing combined pretreatment method and device |
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| Publication Number | Publication Date |
|---|---|
| CN113402136A CN113402136A (en) | 2021-09-17 |
| CN113402136B true CN113402136B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110675978.8A Active CN113402136B (en) | 2021-06-17 | 2021-06-17 | Oil-containing sludge screening and heat washing combined pretreatment method and device |
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|---|---|---|---|---|
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| DE3226049A1 (en) * | 1982-07-12 | 1984-01-12 | Helmut 4400 Münster Thal | METHOD AND DEVICE FOR PRODUCING SUBSTANCES OF DIFFERENT GRAIN SIZE FROM MIXTURES |
| SE9701191D0 (en) * | 1997-04-02 | 1997-04-02 | Spirac Engineering Ab | transport device |
| WO2002011853A1 (en) * | 2000-08-04 | 2002-02-14 | Rudolf Bischof Gmbh Technische Handelsvertretungen | Separating device for separating fluids from solids and use thereof |
| DE102004038842A1 (en) * | 2004-05-10 | 2005-12-08 | Rudolf Bischof Gmbh Technische Handelsvertretungen | Moisture removal and compressing unit for solids, comprises a press element composed of a stamper or piston, and a removal unit for liquid |
| CN104496138A (en) * | 2014-12-25 | 2015-04-08 | 郭朝军 | Oily sludge separation treatment equipment |
| CN108675577A (en) * | 2018-05-22 | 2018-10-19 | 四川深蓝环保科技有限公司 | A kind of processing method of oily sludge |
| CN209555152U (en) * | 2019-01-09 | 2019-10-29 | 北京伟创力科技股份有限公司 | A kind of pretreatment unit of oily sludge |
| CN112958595A (en) * | 2021-02-26 | 2021-06-15 | 中国石油天然气集团有限公司 | Hot washing method and equipment for oil-containing sludge sundries |
| CN213446314U (en) * | 2020-10-21 | 2021-06-15 | 福州百特环保设备有限公司 | Channel spiral coarse grating machine |
-
2021
- 2021-06-17 CN CN202110675978.8A patent/CN113402136B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH174026A (en) * | 1934-06-15 | 1934-12-31 | Buehler Ag Geb | Screw press with vacuum device. |
| DE3226049A1 (en) * | 1982-07-12 | 1984-01-12 | Helmut 4400 Münster Thal | METHOD AND DEVICE FOR PRODUCING SUBSTANCES OF DIFFERENT GRAIN SIZE FROM MIXTURES |
| SE9701191D0 (en) * | 1997-04-02 | 1997-04-02 | Spirac Engineering Ab | transport device |
| WO2002011853A1 (en) * | 2000-08-04 | 2002-02-14 | Rudolf Bischof Gmbh Technische Handelsvertretungen | Separating device for separating fluids from solids and use thereof |
| DE102004038842A1 (en) * | 2004-05-10 | 2005-12-08 | Rudolf Bischof Gmbh Technische Handelsvertretungen | Moisture removal and compressing unit for solids, comprises a press element composed of a stamper or piston, and a removal unit for liquid |
| CN104496138A (en) * | 2014-12-25 | 2015-04-08 | 郭朝军 | Oily sludge separation treatment equipment |
| CN108675577A (en) * | 2018-05-22 | 2018-10-19 | 四川深蓝环保科技有限公司 | A kind of processing method of oily sludge |
| CN209555152U (en) * | 2019-01-09 | 2019-10-29 | 北京伟创力科技股份有限公司 | A kind of pretreatment unit of oily sludge |
| CN213446314U (en) * | 2020-10-21 | 2021-06-15 | 福州百特环保设备有限公司 | Channel spiral coarse grating machine |
| CN112958595A (en) * | 2021-02-26 | 2021-06-15 | 中国石油天然气集团有限公司 | Hot washing method and equipment for oil-containing sludge sundries |
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|---|---|
| CN113402136A (en) | 2021-09-17 |
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