CN113511791A

CN113511791A - Oil sludge screening pretreatment system

Info

Publication number: CN113511791A
Application number: CN202110840983.XA
Authority: CN
Inventors: 董博超; 田汪洋; 徐芙清; 叶利峰; 于立松; 车磊; 林法伟
Original assignee: Zhe Jiang Eco Environmental Technology Co ltd
Current assignee: Zhe Jiang Eco Environmental Technology Co ltd
Priority date: 2021-07-25
Filing date: 2021-07-25
Publication date: 2021-10-19
Anticipated expiration: 2041-07-25
Also published as: CN113511791B

Abstract

The invention belongs to the technical field of oily sludge treatment, and particularly relates to an oily sludge screening pretreatment system. The oil sludge screening pretreatment system comprises a vibrating screening device (10), an extruding screening device (20) and a hot washing screening device (30), wherein the vibrating screening device (10), the extruding screening device (20) and the hot washing screening device (30) are connected with the same material collecting area (40); the vibrating screening device (10) comprises a conveying belt (11) and a vibrating screen (12) positioned above the conveying belt; the first screw conveyor of the extrusion screening device (20) is provided with a speed reduction section (24), and the speed reduction section (24) enables materials to form a material relative accumulation area; the hot washing screening device (30) comprises a second screw conveyor, and the second screw conveyor is positioned in the hot washing cavity (31). The invention can adopt different screening pretreatment modes for the oil sludge with different water contents, thereby improving the pertinence and the adaptability of the oil sludge treatment station to different oil sludge.

Description

Oil sludge screening pretreatment system

Technical Field

The invention belongs to the technical field of oily sludge treatment, and particularly relates to an oily sludge screening pretreatment system.

Background

The pyrolysis carbonization technology has gradually become the mainstream scheme of oil sludge treatment. The water content of the oil sludge has large fluctuation, and the oil sludge generated in the same oil field also has different water content, so that most oil fields can be provided with oil sludge drying yards for drying the water content of the oil sludge to be basically consistent, and the oil sludge enters a pyrolysis carbonization process after being screened by a vibrating screen. Although this pretreatment method can be applied to the treatment of oil sludge having various water contents, the efficiency is low.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an oil sludge screening pretreatment system, which enables a treatment site to be suitable for screening pretreatment of oil sludge with different water contents.

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

oily sludge screening pretreatment systems, including vibration screening plant, still including extrusion screening plant and hot washing screening plant, select different screening plant according to the difference of material moisture content.

The invention conception of the invention is as follows: three sets of screening pretreatment devices are arranged at a disposal site, a vibration screening device is selected for screening the oil sludge with the water content of about 0-30%, an extrusion screening device is selected for screening the oil sludge with the water content of about 30-50%, and a hot washing screening device is selected for screening the oil sludge with the water content of more than 50%. The three sets of screening pretreatment devices can rapidly complete screening pretreatment on the oil sludge with different water contents generated in the same area or different areas.

As an improvement, the vibration screening device, the extrusion screening device and the hot washing screening device are connected with the same material collecting area. The materials are gathered in the same material gathering area and then enter the next treatment procedure, so that the properties of the materials entering the next treatment procedure are relatively stable.

As an improvement, the vibrating screen device comprises a conveying belt and a vibrating screen arranged above the conveying belt. The lower material of moisture content is directly grabbed the vibrations screen cloth of conveyer belt top by the grab bucket, and the material through vibrations screen cloth arrives the material and gathers the district after being carried by the conveyer belt.

As a further improvement, the extrusion screening device comprises a first spiral conveyor, the first spiral conveyor is provided with a material inlet, a fine material outlet and a coarse material outlet, the fine material outlet is positioned at the bottom of the first spiral conveyor, the first spiral conveyor is provided with a speed reduction section, and the speed reduction section enables materials to form a material relative accumulation area between the fine material outlet and the coarse material outlet. For materials with moderate water content, water is extruded by an extrusion method. In the scheme, materials which can fall out from a fine material outlet are defined as fine materials, and materials which cannot fall out from the fine material outlet due to larger granularity are defined as coarse materials. The relative material accumulation area refers to an area where materials are relatively accumulated due to the reduction of the conveying speed of the materials.

As a modification, the deceleration section consists of a bladeless area and a shredding blade area. The shredding blade zone is used to break up large particles of material.

As an improvement, the strip-shaped sieve is arranged at the fine material outlet. Once the particles are temporarily stuck on the bar screen, the stuck particles are pushed in the radial direction and the axial direction simultaneously under the stirring of the spiral conveying shaft. Under the effect of radial extrusion, the particulate matter of inlay card takes place lateral shifting along the bar screen, and axial ascending extrusion power more easily pushes away the draw-in groove on the bar screen during lateral shifting. Therefore, the bar screen is less likely to be clogged than the circular screen.

As a further improvement, the bar screen is formed by a mode that a rod-shaped object is fixed at the bottom of the first spiral conveyer in a pluggable mode. When the particles are embedded in the bar-shaped sieve and are not easy to push away, the rod-shaped object is pulled out, and then the particles fall down naturally.

As a further improvement, the hot washing screening device comprises a second screw conveyor, the second screw conveyor is located in a hot washing cavity, the second screw conveyor is provided with sieve holes so that the second screw conveyor is communicated with the hot washing cavity, the liquid level of hot washing liquid in the hot washing cavity is higher than the bottom of the second screw conveyor, materials are pushed forward by a screw blade of the second screw conveyor and are subjected to hot washing by the hot washing liquid in the hot washing cavity, and insoluble materials are led out from the discharge end of the second screw conveyor. And for the material with higher water content, combining with the hot washing process. The materials are hot-washed while being propelled, so that the materials are fully rolled and dissolved, and the hot-washing effect is relatively good. On the other hand, due to the viscosity of the materials, the sieve holes are easy to be blocked under the combined action of insoluble materials with proper particle size. And along with the rotation of the spiral blade of the second spiral conveyor, the top end of the spiral blade performs rhythmic rolling and scraping on the inner wall of the shell of the second spiral conveyor, so that insoluble materials cannot block the sieve pores.

As a further improvement, the second spiral conveyer is provided with a rotary extrusion feeding part below the feeding end, materials are extruded into the second spiral conveyer, and the materials with the grain sizes larger than the limited grain size of the rotary extrusion feeding part directly discharge out of the second spiral conveyer.

Due to the presence of the rotary extrusion feeding part, the material is extruded into the shell of the second screw conveyer, and the large-particle material with the particle size larger than the limited particle size is discharged out of the shell of the second screw conveyer. The grain diameter of material in the second screw conveyer has been guaranteed on the one hand to rotatory extrusion feeding, has been equivalent to the completion simultaneously and has rolled the dispersion to the first time of material, helps improving hot washing effect.

As a modification, the second screw conveyor is provided with a housing driving motor, and the housing driving motor drives the housing of the second screw conveyor to rotate. After the 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.

In conclusion, the invention can adopt different screening pretreatment modes for the oil sludge with different water contents, improves the pertinence and adaptability of the oil sludge treatment station to different oil sludge, and is beneficial to improving the pretreatment efficiency and the treatment capacity of the oil sludge treatment station.

Drawings

FIG. 1 is a schematic diagram of the apparatus arrangement of the present invention;

FIG. 2 is a schematic diagram of the construction of the vibratory screening apparatus of the present invention;

FIG. 3 is a schematic diagram of the construction of the extruded screening device of the present invention;

FIG. 4 is a left side view of the extruded screening device of the present invention;

FIG. 5 is a schematic structural view of a hot wash screening device of the present invention, wherein the wavy lines indicate the level of hot wash fluid;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5, the wavy line above the heating coil indicating the level of hot washing liquid;

FIG. 7 is a sectional view taken along line B-B of FIG. 5;

FIG. 8 is a schematic view of the rotary extrusion feeder part of the present invention.

In the figure: 10. a vibratory screening device; 11. a heating coil; 12. vibrating the screen; 20. an extrusion screening device; 21. a material inlet; 22. a fine material outlet; 221. a bar screen; 23. a coarse material outlet; 24. a deceleration section; 241. a bladeless region; 242. a shredding blade zone; 25. a feed hopper; 26. a support; 27. a step ladder; 30. hot washing the screening device; 31. hot washing the cavity; 32. a discharge end; 321. a large material outlet; 33. a feeding end; 34. rotating and extruding the feeding part; 341. extruding the screw; 35. a housing drive motor; 36. a screw conveying motor; 37. a feeding bin; 38. a cleaning liquid replenishing pipe; 39. a heating coil.

Detailed Description

Example 1

The invention relates to a system suitable for screening pretreatment of oil sludge with different water contents, which comprises a vibrating screening device 10, an extruding screening device 20 and a hot washing screening device 30 which are arranged in parallel as shown in figure 1. The vibration screening device 10, the extrusion screening device 20 and the hot washing screening device 30 are connected with the same material collecting area 40, and materials output by the screening devices are collected and mixed in the material collecting area 40 and then enter the next treatment process. The method comprises the steps of selecting and screening the oil sludge with the water content of about 0-30% by using a vibration screening device 10, selecting and screening the oil sludge with the water content of about 30-50% by using an extrusion screening device 20, and selecting and screening the oil sludge with the water content of more than 50% by using a hot washing screening device 30. Of course, the above-mentioned moisture percentage classification is a recommended numerical value. In fact, the oil sludge with the water content of 40% can also be selected from the vibration screening device 10 or the hot washing screening device 30.

As shown in FIG. 2, vibratory screening device 10 includes a conveyor belt 11 and a vibratory screen 12 positioned above the conveyor belt. For the oil sludge with lower water content, the grab bucket grabs the oil sludge to the vibration screen 12, large particles are separated by the vibration screen 12, and the oil sludge passing through the vibration screen 12 is conveyed to the material collecting area 40 by the conveying belt 11.

As shown in fig. 3 and 4, the press and screen apparatus 20 includes a frame 26, and a step 27 is provided on the frame 26. The main body of the extrusion screening apparatus 20 is a first screw conveyor, which is fixed on the support 26 and has a double spiral shaft structure. A material inlet 21 is formed in the top of the first spiral conveyor, and a feed hopper 25 is arranged at the top of the material inlet 21. The first screw conveyer is provided with a fine material outlet 22 and a coarse material outlet 23 at the bottom, a speed reduction section 24 is arranged between the fine material outlet 22 and the coarse material outlet 23, and the speed reduction section comprises a blade-free area 241 and a shredding blade area 242. The velocity reduction section 24 forms a relative accumulation zone for the material between the fine material outlet 22 and the coarse material outlet 23.

The fine material outlet is provided with a strip-shaped screen 221, the strip-shaped screen 221 is formed by fixing rods at the bottom of the first screw conveyer in a pluggable mode, and the gap between every two adjacent rods is 30-40 mm. The shell of the first screw conveyor is provided with a jack for accommodating the rod-shaped object, and the jack is in clearance fit with the rod-shaped object so that the rod-shaped object can rotate. When the particulate matter is temporarily clamped on the bar-shaped sieve, the rod-shaped object can roll at a certain angle along with the advance of the material, and the clamped particulate matter is conveniently pushed forwards. When the particulate matter is embedded in the bar-shaped screen and is not easy to push away, the problem can be solved by pulling out the rod-shaped object.

And (3) screening and pretreating the oily sludge with higher water content by adopting a hot washing screening device 30. As shown in fig. 5, the hot washing and screening device 30 includes a second screw conveyor, the second screw conveyor has a feeding end 33 and a discharging end 32, the top of the feeding end 33 is a feeding bin 37, a rotary extrusion feeding component 34 is arranged below the feeding end 33, the rotary extrusion feeding component 34 is a part of the housing of the second screw conveyor, the rotary extrusion feeding component 34 has a structure as shown in fig. 8, a grid is arranged on the rotary extrusion feeding component 34, extrusion screws 341 are arranged on two sides of the rotary extrusion feeding component 34, and the rotation of the extrusion screws 341 realizes auxiliary extrusion of the oil sludge. The rotary extrusion feeding component 34 is formed with a rotary feeding cavity, the rotary feeding cavity is provided with a big material outlet 321, as shown in fig. 5 and 7, the material is extruded to enter the second screw conveyor, and the material with the particle size larger than the particle size limited by the rotary extrusion feeding component 34 is directly discharged from the big material outlet 321 out of the second screw conveyor.

As shown in fig. 5 and 6, the second screw conveyor is integrally located in the hot washing cavity 31, the casing of the second screw conveyor is provided with a sieve hole to communicate the second screw conveyor with the hot washing cavity 31, and the liquid level of the hot washing liquid in the hot washing cavity 31 is higher than the bottom of the second screw conveyor, so that the hot washing liquid can enter the second screw conveyor through the sieve hole. The second screw conveyor is of a single screw shaft construction, with the single screw shaft of the second screw conveyor being driven by a screw conveyor motor 36. The materials are pushed by the helical blades of the second screw conveyer to move forward, meanwhile, the hot washing is carried out by the hot washing liquid in the hot washing cavity 31, oil in the materials is dissolved in the hot washing liquid and enters the hot washing cavity 31 along with oily water through the sieve holes, and insoluble materials are led out from the discharge end 32 of the second screw conveyer. The second screw conveyor is provided with a casing drive motor 35, and the casing drive motor 35 drives the casing of the second screw conveyor to rotate.

The bottom of the hot washing cavity 31 is inclined, and the bottom of the hot washing cavity 31 is provided with a cleaning liquid replenishing pipe 38 for replenishing the hot cleaning liquid in the hot washing cavity 31. The level of the hot wash liquid is preferably submerged in the screw conveyor 1/3. A heating coil 39 is arranged in the hot washing cavity 31 and used for heating the hot washing liquid.

Claims

1. Oily sludge screening pretreatment systems, including vibration screening device (10), its characterized in that: the device also comprises an extrusion screening device (20) and a hot washing screening device (30), wherein different screening devices are selected according to different water contents of materials.

2. The oil sludge screening pretreatment system of claim 1, wherein: the vibrating screening device (10), the extruding screening device (20) and the hot washing screening device (30) are connected with the same material collecting area (40).

3. The oil sludge screening pretreatment system of claim 1, wherein: the vibrating screen device (10) comprises a conveying belt (11) and a vibrating screen (12) positioned above the conveying belt.

4. The oil sludge screening pretreatment system of claim 1, wherein: extrusion screening plant (20) include first screw conveyer, and material import (21), fine material export (22) and thick material export (23) have been seted up to first screw conveyer, and fine material export (22) are located first screw conveyer's bottom, and first screw conveyer is provided with speed reduction section (24), and speed reduction section (24) make the material form the relative district of piling up of material between fine material export (22) and thick material export (23).

5. The oil sludge screening pretreatment system of claim 4, wherein: the deceleration section comprises a bladeless region (241) and a shredding blade region (242).

6. The oil sludge screening pretreatment system of claim 4, wherein: the fine material outlet (22) is provided with a strip-shaped sieve (221).

7. The oil sludge screening pretreatment system of claim 6, wherein: the bar screen (221) is formed by a shaft which is fixed at the bottom of the first screw conveyer in a pluggable mode.

8. The oil sludge screening pretreatment system of claim 1, wherein: screening plant (30) is washed to heat includes second screw conveyer, and second screw conveyer is located hot washing cavity (31), and second screw conveyer has seted up the sieve mesh and has made second screw conveyer and hot washing cavity (31) intercommunication, and the liquid level of hot washing liquid is higher than second screw conveyer's bottom in hot washing cavity (31), and the material is being implemented the hot washing by the hot washing liquid in hot washing cavity (31) when being pushed forward by second screw conveyer's helical blade, and insoluble material then derives from second screw conveyer's discharge end (32).

9. The oil sludge screening pretreatment system of claim 8, wherein: the second screw conveyor is provided with a rotary extrusion feeding part (34) below the feeding end (33), materials are extruded to enter the interior of the second screw conveyor, and the materials with the grain sizes larger than the limited grain size of the rotary extrusion feeding part (34) are directly discharged out of the second screw conveyor.

10. The oil sludge screening pretreatment system of claim 8, wherein: the second screw conveyor is provided with a shell driving motor (35), and the shell driving motor (35) drives the shell of the second screw conveyor to rotate.