CN218115240U - Hierarchical edulcoration fluidization system of oily sludge - Google Patents

Abstract

The utility model belongs to the technical field of oily sludge treatment, concretely relates to hierarchical edulcoration fluidization system of oily sludge. The hierarchical edulcoration fluidization system includes: the crushing unit, the preheating unit, the fluidized oil removal unit and the screening unit are arranged from upstream to downstream; a flotation unit and a mortar separation unit are arranged in parallel at the downstream of the screening unit; and a sand washing unit and a vibration screening unit are arranged at the downstream of the mortar separation unit in parallel. The floating oil and various impurities in the impurity-containing oil sludge are classified and separated by the unit combination. The free dirty oil is separated in time, so that emulsification of oil products in subsequent mechanical operation and secondary combination with solids are avoided, and the oil removal efficiency is improved; the separated straws, woven bags, filaments, weeds, silk wadding, cotton threads and other oily light impurities with low density have high ignition loss rate, and the burning disposal cost of outsourcing is reduced; the separated bricks, stones and sand reach harmless indexes and can be recycled.

Description

Hierarchical edulcoration fluidization system of oily sludge

Technical Field

The utility model belongs to the technical field of oily sludge treatment, concretely relates to hierarchical edulcoration fluidization system of oily sludge.

Background

The oily sludge, commonly referred to as oil sludge for short, is oily waste associated with the oil exploitation, storage and transportation and processing links, and is classified as hazardous waste due to toxicity. The oil content of the oil sludge is generally between 5 and 45 percent, so the method has high recovery value. Therefore, the oil sludge is subjected to reduction, recycling and harmless treatment by adopting a specific process and equipment, so that the problem of environmental pollution is solved, and economic benefit is brought. Mechanical impurities can also be generated in the actual production link of the oil sludge, for example, the falling oil sludge generated by leakage and leakage contains sand, straw, weeds and the like; in the cleaning link of the crude oil storage tank, in order to thoroughly clean the residual oil in the tank body, wood chips and other oil absorption materials are often introduced, so that the generated oil sludge for cleaning the tank contains oil wood chips and other impurities; the refining oil sludge treated by outsourcing is frequently formed by bagging and is transported outside due to transportation requirements, so the collected refining oil sludge often contains impurities such as woven bags, plastic bags and the like; the oily sludge produced in the oil field well drilling and well repairing links contains anti-seepage cloth, oil absorption cotton and labor protection products. Impurities in the sludge present challenges to the stable production of sludge treatment plants.

Conventional sludge pretreatment systems, which mainly comprise crushing and screening units, typically include crushers, mechanical grate impurity removal, rotating cage screening equipment, vibratory screening equipment and the like, and although some impurities in sludge can be removed, the following problems and challenges exist in the actual operation:

(1) Incomplete removal of impurities: the oil sludge has certain viscosity, and in order to separate part of impurities, the sieve holes of the used sieving units are generally large, so that part of impurities with small particle sizes are difficult to remove;

(2) Screening equipment is easy to block, and needs frequent manual intervention: the same reason is that the oil sludge has certain viscosity, particularly heavy oil sludge, is adhered to the surface of the screen mesh, so that the screen mesh becomes smaller and smaller until the screen mesh is blocked;

(3) The fine sand in the oil sludge is difficult to remove: the traditional crushing and screening method is difficult to separate fine sand in the oil sludge, so that the fine sand enters a subsequent hot washing process, is easy to deposit in a pipeline, and abrades mechanical moving equipment;

(4) The separated impurities have large mud content and the outsourcing cost is high: because the oil sludge has viscosity, a certain amount of oil sludge is mixed in impurities separated by the traditional crushing and screening, and sand and the like are mixed in the impurities. The screened rejects are outsourcing with high disposal cost.

The present application is proposed to solve the above problems.

Disclosure of Invention

The application provides an oily sludge classified impurity removal fluidization system, classified impurity removal fluidization system includes: the crushing unit, the preheating unit, the fluidized oil removal unit and the screening unit are arranged from upstream to downstream;

a flotation unit and a mortar separation unit are arranged in parallel at the downstream of the screening unit;

a sand washing unit and a vibration screening unit are arranged in parallel at the downstream of the mortar separation unit;

and a channel leading to the sand washing unit is also arranged at the downstream of the vibration screening unit.

Preferably, the fluidized degreasing unit comprises: the fluidized tank body 1, and a stirring device 4 positioned inside the fluidized tank body 1;

the oil collecting tank 2 is arranged at the middle upper part of the fluidization tank body 1, an oil discharge port is formed in the bottom of the oil collecting tank 2, and a discharge port 3 is formed in the bottom of one end of the fluidization tank body 1.

Preferably, the flotation unit comprises: the system comprises a reflux pump, a jet manifold, a rotary mechanical grid and a sand conveying machine;

wherein the return pump is used for conveying the slurry downstream of the rotary mechanical grating to the upstream of the rotary mechanical grating;

the jet manifold is used for flushing the screened and separated residues screened and separated by the screening unit towards the direction of the rotary mechanical grating so as to separate light impurities and heavy impurities in the screened residues;

the rotary mechanical grating is used for separating light impurities in the water flow;

the sand conveying machine is used for outputting heavy impurities sinking into the bottom.

Preferably, the stirring device 4 is a double-helical ribbon horizontal stirring device.

Preferably, a flushing pipe and a steam heating pipe are arranged inside the fluidized oil removal unit.

The flushing pipe is positioned in the fluidization oil removal unit, and is specifically positioned between a double helical ribbon type stirring paddle of the double helical ribbon type horizontal stirring equipment and the upper top surface of the fluidization tank body to flush materials adhered to the stirring paddle.

The steam heating pipe is arranged between the double helical ribbon type stirring paddle of the double helical ribbon type horizontal stirring equipment and two side surfaces of the fluidization tank body 1 and at the position of the lower part of the double helical ribbon type horizontal stirring equipment, and is used for heating materials in the fluidization tank body 1.

Preferably, the sieving unit comprises: the device comprises a rotating cage 8, sieve holes 9 distributed on the rotating cage 8, a rotating cage feed inlet 5 positioned at the front end of the rotating cage 8, a slurry discharge outlet 6 positioned at the lower part of the rotating cage 8, a screen residue discharge outlet 7 positioned at the rear end of the rotating cage 8, a scraping brush 12 at least partially arranged in the rotating cage 8, and a spray pipe 11 arranged above the rotating cage 8.

And a spiral track 10 is arranged on the inner wall of the rotating cage 8 and is used for conveying screened waste.

Compared with the prior art, the invention has the following beneficial effects:

1. the utility model provides a hierarchical edulcoration fluidization system of oily sludge, including crushing unit, preheating unit, fluidization deoiling unit, screening unit, flotation unit, mortar separation unit and vibration screening unit.

The floating oil and various impurities in the impurity-containing oil sludge are classified and separated by the unit combination.

Specifically, the method comprises the following steps: the free dirty oil is separated in time, so that the emulsification of oil products in subsequent mechanical operation and the secondary combination with solids are avoided, and the oil removal efficiency is improved; the separated straws, woven bags, filaments, weeds, silk wadding, cotton threads and other oily light impurities with low density have high ignition loss rate, and the cost of outsourcing incineration disposal is reduced; the oil content of the separated bricks, stones, sand and the like is generally lower than 0.3 percent, so that the oil content reaches harmless indexes, and the oil can be directly recycled; the residual slurry enters the subsequent chemical hot washing process for advanced treatment, so that the risk of slurry conveying blockage and abrasion of equipment and pipelines is avoided.

2. The scraping brush 12 is arranged in the rotating cage 8, and the scraping brush 12 is used for scraping off part of screen wastes adhered to the inner wall of the rotating cage 8. This application is in 8 tops of rotating cage are equipped with shower 11, and shower 11 is used for hot water to wash the oil stain of adhesion on the part rotating cage 8. This avoids the problem of the conventional screening plant that the separated sludge is prone to clogging.

Drawings

FIG. 1 is the processing flow chart of the fluidized system for removing impurities in oil-containing sludge by stages.

Fig. 2 is a schematic external view of a fluidized degreasing device.

Fig. 3 is a schematic structural view of the stirring device 4.

Figure 4 is an external view of the rotating cage screening device.

Figure 5 is a diagram of the construction of the cage screening apparatus.

List of reference numbers:

1. the device comprises a fluidization tank body, 2 parts of an oil collecting tank, 3 parts of a discharge port, 4 parts of a stirring device, 4 parts of 1 part of a steel pipe, 4 parts of 2 parts of a spiral belt, 5 parts of a rotating cage feed port, 6 parts of a slurry discharge port, 7 parts of a screen residue discharge port, 8 parts of a rotating cage, 9 parts of a screen hole, 10 parts of a spiral track, 11 parts of a spray pipe, 12 parts of a scraping brush.

Detailed Description

The present invention will be described in further detail with reference to examples.

It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, but are all conventional products available by purchase.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, "connected" as used herein may include wirelessly connected.

In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience in describing and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "provided" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.

It will be understood by those skilled in the art that, unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The utility model provides a hierarchical edulcoration fluidization system of oily sludge, includes crushing unit, preheats unit, fluidization deoiling unit, screening unit, flotation unit, mortar separation unit and vibration screening unit, and each unit function is as follows:

a crushing unit: crushing impurities containing the impurity-containing oil sludge in various forms into particles with the particle size of less than 5 cm;

a preheating unit: preheating and temporarily caching the crushed oil sludge;

a fluidization oil removal unit: mixing and fluidizing the oil sludge, water and the medicament, and separating an oil layer on the upper layer of the fluidized slurry;

a screening unit: dividing the fluidized material into screen residue larger than 5mm and slurry smaller than 5 mm;

a flotation unit: separating light impurities such as straws, woven bags and filaments from heavy impurities such as bricks and stones in the screenings, wherein the oil content of the discharged heavy impurities such as bricks and stones is lower than 0.3%;

a mortar separation unit: separating sand from the slurry;

vibration screening unit: further screening fine sand with the grain diameter of more than 0.2mm and impurities such as weeds, silk floss, cotton threads and the like with the grain diameter of more than 2mm in the slurry,

a sand washing unit: and cleaning the sand separated by the mortar separation unit and the vibration screening unit to ensure that the oil content is less than 0.3 percent.

The fluidization oil removal equipment comprises a fluidization tank body 1 and stirring equipment 4 positioned in the tank body; the upper middle part of the fluidization tank body is provided with an oil collecting tank 2, floating oil on the upper layer of the fluidized material in the tank body is discharged through an oil outlet at the bottom of the oil collecting tank, and a discharge outlet 3 of the fluidization oil removal equipment is positioned at the bottom of one end of the tank body. The stirring equipment is double-screw horizontal stirring, a rotating shaft of the stirring equipment is a steel pipe bundle formed by annularly fixing four DN80 steel pipes 4-1, and two screw bands 4-2 are spirally wound on the periphery of the steel pipe bundle in a reverse direction. And a flushing pipe and a steam heating pipe are arranged in the fluidized oil removing equipment.

The screening unit is a rotating cage screening device, fluidized oily sludge enters from a rotating cage feeding port 5, a motor drives a rotating cage 8 to rotate, screen holes 9 are uniformly distributed on the wall of the rotating cage 8, the diameter of each screen hole 9 is 4-8 mm, and slurry penetrates through the screen holes 9 and is discharged from a slurry discharge port 6; screen wastes are conveyed to the other end of the rotating cage 8 through a spiral track 10 on the inner wall of the rotating cage and discharged from a screen wastes discharge port 7, part of the screen wastes adhered to the inner wall of the rotating cage 8 are scraped by a scraping brush 12 arranged at the top of the rotating cage, and part of adhered oil stains are washed by hot water sprayed by a spray pipe 11 arranged at the top end.

The flotation unit is water washing flotation equipment which mainly comprises a reflux pump, a jet manifold, a rotary mechanical grid and a sand conveying machine. The slurry at the lower stream of the rotary mechanical grid is conveyed to the upper stream of the grid by a reflux pump, the screened and separated residues are washed by a rotating cage at a high speed towards the direction of the grid through a bottom jet manifold, so that light impurities and heavy impurities in the screened residues are separated, the light impurities flow through the grid along with water and are fished out, the heavy impurities sink into the bottom and are output by a sand conveyor, and the sand conveyor is a shaftless spiral conveying or chain scraper conveyor.

The treatment process of the oily sludge grading, impurity removing and fluidizing system comprises the following steps:

impurity-containing sludge in various forms enters a crushing unit, impurities are crushed into particles with the particle size smaller than 5cm, the particles enter a preheating unit with steam heating for heating, then enter a fluidization oil removal unit through a feeding device, are mixed with water and a cleaning agent in a certain proportion for fluidization, and upper-layer dirty oil is collected through a dirty oil overflow port and enters a subsequent dirty oil purification device for further treatment. The lower layer of the fluidized oil removal unit is a mixture after oil removal.

The mixture after deoiling flows to a screening unit from the bottom of the fluidized deoiling equipment, and the screening equipment divides the slurry into screen residue larger than 5mm and slurry smaller than 5 mm.

And (4) the screenings larger than 5mm enter a flotation unit to be further separated into light impurities with smaller specific density, such as straws, woven bags, filaments and the like, and heavy impurities with larger density, such as bricks, stones and the like. And (4) feeding the slurry with the size of less than 5mm into a mortar separation unit, and separating coarse sand in the slurry.

And the residual slurry enters a vibrating screening unit to further screen out fine sand with the particle size larger than 0.2mm, and impurities such as weeds, silk battings, cotton threads and the like with the particle size larger than 2mm, and the residual slurry mainly comprises oil, water and mud and then enters a subsequent thermochemical cleaning device to be further cleaned.

And (4) light impurities separated by the flotation unit and impurities such as weeds, silk battings, cotton threads and the like separated by the vibration screening unit are incinerated and disposed. The oil content of the brick, the stone and other heavy impurities separated by the flotation unit and the oil content of the sand and stone discharged by the sand washing unit are lower than 0.3 percent, and the oil and stone are recycled after reaching harmless indexes.

Claims (6)

1. The classified impurity removal fluidization system for the oily sludge is characterized by comprising: the crushing unit, the preheating unit, the fluidized oil removal unit and the screening unit are arranged from upstream to downstream;

a flotation unit and a mortar separation unit are arranged in parallel at the downstream of the screening unit;

a sand washing unit and a vibration screening unit are arranged at the downstream of the mortar separation unit in parallel;

and a channel leading to the sand washing unit is also arranged at the downstream of the vibration screening unit.

2. The system of claim 1, wherein the fluidized degreasing unit comprises: a fluidization tank (1), a stirring device (4) located inside the fluidization tank (1);

the oil collecting tank is characterized in that an oil collecting tank (2) is arranged at the middle upper part of the fluidization tank body (1), an oil discharging port is arranged at the bottom of the oil collecting tank (2), and a discharging port (3) is arranged at the bottom of one end of the fluidization tank body (1).

3. The system of claim 1, wherein the flotation unit comprises: the system comprises a reflux pump, a jet manifold, a rotary mechanical grid and a sand conveying machine;

wherein the return pump is used for conveying the slurry downstream of the rotary mechanical grating to the upstream of the rotary mechanical grating;

the jet manifold is used for flushing the screened and separated residues screened and separated by the screening unit towards the direction of the rotary mechanical grating so as to separate light impurities and heavy impurities in the screened residues;

the rotary mechanical grating is used for separating light impurities in the effluent;

the sand conveying machine is used for outputting heavy impurities sinking into the bottom.

4. The system for fractional impurity removal and fluidization of oily sludge according to claim 2, wherein said stirring device (4) is a double helical horizontal stirring device.

5. The system of claim 2, wherein a flushing pipe and a steam heating pipe are arranged in the fluidized oil removal unit.

6. The system of claim 1, wherein the screening unit comprises: the rotary cage (8), the sieve mesh (9) that distributes on the rotary cage (8), be located rotary cage feed inlet (5) of rotary cage (8) front end, be located thick liquids discharge port (6) of rotary cage (8) lower part, be located sifting residue discharge port (7) of rotary cage (8) rear end, establish at least partially scrape brush (12) in rotary cage (8), establish shower (11) above rotary cage (8).

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