Oily sludge screening and hot washing combined pretreatment method and device

文档序号:2138 发布日期:2021-09-17 浏览:52次 中文

1. The screening and hot washing combined pretreatment method for the oily sludge is characterized by comprising the following steps of: the material screening is implemented in a hot washing cavity, a spiral conveyor is arranged in the hot washing cavity, a spiral conveyor shell is provided with sieve pores, so that hot washing liquid in the hot washing cavity can enter the interior of the spiral conveyor shell through the sieve pores, and the two ends of the spiral conveyor shell are respectively provided with a feeding end and a discharging end; the inner wall of the shell of the screw conveyer is regularly rolled and scraped while the helical blades of the screw conveyer push the oily sludge to move forward, the oily sludge is dissolved in hot washing liquid and enters a hot washing cavity along with oily sewage through sieve pores, and insoluble materials are led out from the discharge end of the shell of the screw conveyer.

2. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 1, characterized in that: the distance between the spiral blade of the spiral conveyor and the inner wall of the shell of the spiral conveyor is 0-10 mm.

3. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 1, characterized in that: the screw conveyor shell is driven by a shell driving motor, so that the screw conveyor shell can rotate.

4. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 3, characterized in that: the rotation direction of the shell of the screw conveyer is opposite to the rotation direction of the spiral blades in the screw conveyer.

5. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 1, characterized in that: the liquid level of the hot washing liquid is higher than the bottom of the shell of the screw conveyer.

6. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 1 or 3, characterized in that: the oily sludge is pre-screened below the feed end of the screw conveyor housing.

7. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 6, characterized in that: the pre-screening adopts a rotary extrusion feeding part, the oily sludge is extruded into the shell of the screw conveyer, and large-particle materials with the particle size larger than a limited particle size are discharged out of the shell of the screw conveyer.

8. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 7, characterized in that: rotatory extrusion feeding part is the partly of screw conveyer casing, has seted up the grid on the rotatory extrusion feeding part, and rotatory extrusion feeding part is opened outward and is equipped with rotatory feeding chamber, has seted up the big material export on the rotatory feeding chamber, and the rotation of rotatory extrusion feeding part makes oily sludge realize the extrusion feeding between the inner wall in rotatory feeding chamber and the outer wall of rotatory extrusion feeding part.

9. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 8, characterized in that: the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes auxiliary extrusion of the oily sludge.

10. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 1, characterized in that: the spiral blades are fixed on the spiral conveying shaft, and the hot washing liquid is sprayed to the material through a hot washing liquid channel arranged in the spiral conveying shaft.

11. The oily sludge screening and hot washing combined pretreatment method as claimed in claim 1, characterized in that: the hot washing liquid is heated by a heating coil.

12. Oily sludge screening and hot washing combined pretreatment device comprises a hot washing cavity and is characterized in that: a spiral conveyor is arranged in the hot washing cavity, a screen hole is formed in the shell of the spiral conveyor, so that hot washing liquid in the hot washing cavity can enter the interior of the shell of the spiral conveyor through the screen hole, and a feeding end and a discharging end are respectively arranged at two ends of the shell of the spiral conveyor; the inner wall of the shell of the screw conveyer is rolled and scraped while the helical blades of the screw conveyer push the oily sludge to move forward, the oily sludge is dissolved in hot washing liquid and enters a hot washing cavity along with oily sewage through sieve holes, and insoluble materials are led out from the discharge end of the shell of the screw conveyer.

13. The oily sludge screening and hot washing combined pretreatment device as claimed in claim 12, characterized in that: the screw conveyor housing and the screw blade are driven by different motors.

14. The oily sludge screening and hot washing combined pretreatment device as claimed in claim 12, characterized in that: and a pre-screening component is arranged below the feeding end of the shell of the spiral conveyer.

15. The oily sludge screening and hot washing combined pretreatment device as claimed in claim 12, characterized in that: the pre-screening component is a rotary extrusion feeding component.

16. The oily sludge screening and hot washing combined pretreatment device as claimed in claim 15, characterized in that: rotatory extrusion feeding part is the partly of screw conveyer casing, has seted up the grid on the rotatory extrusion feeding part, and rotatory extrusion feeding part is opened outward and is equipped with rotatory feeding chamber, has seted up the big material export on the rotatory feeding chamber, and the rotation of rotatory extrusion feeding part makes oily sludge realize the extrusion feeding between the inner wall in rotatory feeding chamber and the outer wall of rotatory extrusion feeding part.

17. The oily sludge screening and hot washing combined pretreatment device as claimed in claim 15, characterized in that: the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes auxiliary extrusion of the oily sludge.

18. The oily sludge screening and hot washing combined pretreatment device as claimed in claim 12, characterized in that: the spiral blades are fixed on the spiral conveying shaft, and the hot washing liquid is sprayed to the material through a hot washing liquid channel arranged in the spiral conveying shaft.

Background

The oil-containing sludge is mainly obtained from the processes of petroleum exploration, exploitation and refining. The prior art often uses a pyrolytic desorption process to treat oily sludge. For oily sludge with high oil content and/or liquid content, a hot washing process is usually adopted, and crushing and/or screening impurity removal steps are required before hot washing, for example, a desorption treatment method and a device thereof disclosed in Chinese patent document CN 108795464A, wherein the desorption treatment method comprises five steps of crushing, hot washing, thermal desorption, oil gas treatment and ash residue treatment, and a stirring shaft is arranged for stirring during hot washing. Further, as disclosed in chinese patent document CN 110606633 a, a method and a system for recycling and reducing oily sludge are disclosed, in which a screening and impurity removing step is added between crushing and hot washing. In the prior art, the steps of screening and hot washing are generally carried out in sequence.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a screening and hot washing combined pretreatment method and a device for oily sludge, which can simultaneously complete screening and hot washing steps, are not easy to block sieve pores and are beneficial to improving the hot washing effect.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the oily sludge screening and hot washing combined pretreatment method comprises the steps that material screening is carried out in a hot washing cavity, a spiral conveyor is arranged in the hot washing cavity, a screen hole is formed in the shell of the spiral conveyor, so that hot washing liquid in the hot washing cavity can enter the interior of the shell of the spiral conveyor through the screen hole, and a feeding end and a discharging end are respectively arranged at two ends of the shell of the spiral conveyor; the inner wall of the shell of the screw conveyer is regularly rolled and scraped while the helical blades of the screw conveyer push the oily sludge to move forward, the oily sludge is dissolved in hot washing liquid and enters a hot washing cavity along with oily sewage through sieve pores, and insoluble materials are led out from the discharge end of the shell of the screw conveyer.

The application combines screening into a hot washing process, and saves space and time. Compared with the intermittent centralized treatment mode of the oily sludge, the flowing 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 the hot washing effect is relatively good. On the other hand, the oil sludge has viscosity, so that under the combined action of insoluble materials with proper particle size, sieve pores are easy to be blocked. Along with the rotation of the spiral blade, the top end of the spiral blade regularly rolls and scrapes the inner wall of the shell of the spiral conveyor, so that insoluble materials cannot block the sieve pores.

As an improvement, the spiral blade of the spiral conveyor is 0-10mm away from the inner wall of the shell of the spiral conveyor.

As a modification, the screw conveyor shell is driven by a shell driving motor, so that the screw conveyor shell can rotate. After the screw conveyer shell rotates, the sieve pores are continuously circulated from a low position to a high position and repeatedly washed by hot washing liquid, so that the sieve pores are dredged and prevented from being blocked.

As a further improvement, the rotating direction of the shell of the screw conveyer is opposite to the rotating direction of the helical blades in the screw conveyer, so that the rolling effect on the oily sludge on the inner wall of the shell of the screw conveyer is improved.

As an improvement, the liquid level of the hot washing liquid is higher than the bottom of the shell of the screw conveyer, and the hot washing liquid can be soaked in 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 large volumes of insoluble material from entering the screw conveyor.

As a further improvement, the pre-screening adopts a rotary extrusion feeding part, the oily sludge is extruded into the interior of the shell of the screw conveyer, and large-particle materials with the particle size larger than a limited particle size are discharged out of the shell of the screw conveyer. The rotary extrusion feeding guarantees the particle size of materials in the screw conveyor on the one hand, and most importantly, the solid oily sludge is extruded into the screw conveyor in an extrusion mode, and the extrusion action is favorable for dispersing the materials and improving the hot washing effect.

As a further improvement, the rotary extrusion feeding part is a part of the shell of the screw conveyor, the rotary extrusion feeding part is provided with a grid, the rotary extrusion feeding part is externally provided with a rotary feeding cavity, the rotary feeding cavity is provided with a large material outlet, and the rotation of the rotary extrusion feeding part enables 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 particulate matter, and when oiliness mud fell in the grid bottom, the grid bottom was implemented with rotatory feeding chamber bottom and is rolled the material, extrudes the material between the grid simultaneously.

As a further improvement, the rotary extrusion feeding part is provided with an extrusion screw, and the extrusion screw realizes the auxiliary extrusion of the oily sludge.

As another improvement, the spiral blade is fixed on the spiral conveying shaft, and the hot washing liquid is sprayed to the material through a hot washing liquid channel arranged in the spiral conveying shaft. The internal injection is not only beneficial to dispersing materials, but also beneficial to reducing the adhesion of viscous oil sludge to the helical blade.

As a modification, the hot washing liquid is heated by a heating coil.

The application also provides a device adopting the pretreatment method.

The oily sludge screening and hot washing combined pretreatment device comprises a hot washing cavity, wherein a spiral conveyor is arranged in the hot washing cavity, a spiral conveyor shell is provided with sieve pores, so that hot washing liquid in the hot washing cavity can enter the interior of the spiral conveyor shell through the sieve pores, and the two ends of the spiral conveyor shell are respectively provided with a feeding end and a discharging end; the inner wall of the shell of the screw conveyer is rolled and scraped while the helical blades of the screw conveyer push the oily sludge to move forward, the oily sludge is dissolved in hot washing liquid and enters a hot washing cavity along with oily sewage through sieve holes, and insoluble materials are led out from the discharge end of the shell of the screw conveyer.

As a refinement, the screw conveyor housing and the screw blade are driven by different motors.

As a modification, a pre-screening component is arranged below the feeding end of the shell of the spiral conveyer.

As a further improvement, the pre-screening component is a rotary extrusion feeding component.

As a further improvement, the rotary extrusion feeding part is a part of the shell of the screw conveyor, 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 rotation of the rotary extrusion feeding part enables 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.

As an improvement, an extrusion screw is arranged on the rotary extrusion feeding part, and the extrusion screw realizes the 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 is sprayed to the material through a hot washing liquid channel arranged in the spiral conveying shaft.

In conclusion, the spiral conveyor is combined with the hot washing process, so that the effects of saving space and improving the hot washing effect are achieved, the edges of the spiral blades regularly roll and scrape the inner wall of the shell of the spiral conveyor, the problem that materials block sieve holes is solved, the two working procedures are organically integrated, the stirring of insoluble materials is beneficial to improving the hot washing effect of oily sludge, and the insoluble materials after the hot washing are beneficial to screening due to smaller viscosity.

Drawings

FIG. 1 is a schematic structural view of the present invention, wherein a wavy line at the bottom of the screw conveyor housing indicates the level of hot washing liquid;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, the wavy line above the heating coil indicating the level of hot washing liquid;

FIG. 3 is a schematic view of the rotary extrusion feeder assembly of the present invention;

FIG. 4 is a sectional view taken along line B-B of FIG. 1;

fig. 5 is a schematic structural view of the conveying screw of the present invention.

In the figure: 10. hot washing the cavity; 11. a heating coil; 12. a cleaning liquid replenishing pipe; 21. a screw conveyor housing; 22. a housing drive motor; 23. a conveying screw; 24. a screw conveying motor; 25. a feeding end; 26. a discharge end; 27. a feeding bin; 28. a helical blade; 29. a screw conveying shaft; 30. rotating and extruding the feeding part; 31. a grid; 32. extruding the screw; 33. rotating the feeding cavity; 34. and (4) a large material outlet.

Detailed Description

Example 1

The oily sludge screening and hot washing combined pretreatment method disclosed by the invention has the advantages that the material screening is implemented in the hot washing cavity, and the hot washing operation is realized while the screening is finished.

As shown in FIG. 1, a screw conveyor is arranged above the hot washing chamber 10, and the screw conveyor comprises a screw conveyor housing 21 and a conveying screw 23. The screw conveyor housing 21 is driven by a housing drive 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 helical blades within the screw conveyor. If the screw conveyor housing 21 and the screw blade rotate in the same direction, the rotation speeds of the two are different. The screw blade of the screw conveyor is 0-10mm away from the inner wall of the screw conveyor housing 21.

As shown in fig. 1 and 2, the liquid level of the hot washing liquid in the hot washing chamber 10 is higher than the bottom of the screw conveyor shell 21. The screw conveyor shell 21 is provided with sieve holes so that the hot washing liquid in the hot washing cavity 1 can enter the interior of the screw conveyor shell 21 through the sieve holes 22. The level of the hot washing liquid is preferably 1/3-1/2 that submerges the screw conveyor housing 21. A heating coil 11 is arranged in the hot washing cavity 10 and used for heating 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 replenishing pipe 12 for replenishing the hot cleaning liquid in the hot washing cavity 10.

The two ends of the screw conveyor shell 21 are respectively provided with a feeding end 25 and a discharging end 26, and the top of the feeding end 25 is provided with a feeding bin 27. The contaminated oily sludge is pre-screened at the feed end 25 as it enters the screw conveyor housing 21 through the feed end 25.

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 component 30, an extrusion screw 32 is provided on the rotary extrusion feeding component 30, the extrusion screw 32 is a 2-segment screw segment arranged at intervals, and when the oily sludge enters between the 2 screw segments, the rotation of the screw segment realizes the auxiliary extrusion of the oily sludge. The rotary extrusion feeding part 30 is externally provided with a rotary feeding cavity 33. As shown in fig. 4, the rotary feeding cavity 33 is provided with a large material outlet 34. The rotation of the rotary extrusion charging member 30 causes the oily sludge to be extrusion-charged between the inner wall of the rotary extrusion charging chamber 33 and the outer wall of the rotary extrusion charging member 30. Due to the presence of the rotating extrusion feed member 30, the oily sludge is extruded from the grate 31 into the interior of the screw conveyor housing 21, and large-particle material having a particle size larger than a defined particle size is discharged from the screw conveyor housing 21 through the large material outlet 34.

The helical blade of the screw conveyer pushes the oily sludge to move forward and simultaneously carries out rhythmic rolling and scraping on the inner wall of the screw conveyer shell 21, the oily sludge is dissolved in the hot washing liquid and enters the hot washing cavity along with the oily sewage through the sieve pores, and the insoluble materials are led out from the discharge end 26 of the screw conveyer shell 21.

As shown in fig. 5, the conveying screw 23 includes a screw blade 28 and a screw conveying shaft 29. The spiral blades 28 are fixed on a spiral conveying shaft 29, the spiral conveying shaft 29 is 2 hollow rod-shaped objects which are arranged in parallel, the surface of the spiral conveying shaft 29 is provided with jet holes, and a hollow channel in the spiral conveying shaft 29 and the jet holes form a hot washing liquid channel. The hot washing liquid is internally sprayed to the material through the hot washing liquid channel.

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