CN112958596B

CN112958596B - Multi-stage hot washing screening method and system for oil-containing sludge sundries

Info

Publication number: CN112958596B
Application number: CN202110216419.0A
Authority: CN
Inventors: 徐坡; 季先进; 牛国瑞; 上官少鹏; 魏晓明; 何静怡; 何峰; 俱虎良; 陈星�
Original assignee: China National Petroleum Corp; China Kunlun Contracting and Engineering Corp
Current assignee: China National Petroleum Corp; China Kunlun Contracting and Engineering Corp
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2022-08-19
Anticipated expiration: 2041-02-26
Also published as: CN112958596A

Abstract

The invention relates to a multistage hot washing screening method and a multistage hot washing screening system for oily sludge sundries. The system comprises a feeding subsystem connected according to the working procedures and comprises sundry screening equipment; the hot washing and screening molecular system comprises small-particle material hot washing equipment and multi-stage screening equipment which are sequentially connected; the centrifugal separation subsystem comprises solid-liquid separation equipment and oil-liquid-solid three-phase separation equipment, wherein a liquid phase outlet of the solid-liquid separation equipment is connected with a feed inlet of the oil-liquid-solid three-phase separation equipment; and the auxiliary subsystem comprises large-particle material hot washing equipment. The invention can screen and classify materials with different sizes in the oil-containing sludge sundries according to the sizes and respectively carry out different oil removal treatments, and can wash more materials with larger specific surface area, and can respectively wash the materials with different sizes, thereby ensuring that the oil content of discharged materials is less than 2 percent, and realizing the recovery of dirty oil and the cyclic utilization of water.

Description

Multi-stage hot washing screening method and system for oil-containing sludge sundries

Technical Field

The invention relates to a multistage hot washing screening method and system for oil-containing sludge impurities, and belongs to the technical field of petrochemical industry.

Background

A large amount of domestic and production garbage is mixed in the oil sludge of the oil field, and the difficulty is increased for the treatment of the oil sludge. At present, the treatment technology of oil field oil sludge is various, and the treatment technology can be roughly divided into a hot water washing low-temperature treatment technology of lower than 100 ℃ and a high-temperature treatment technology of pyrolysis, incineration and the like of higher than 400 ℃ according to the treatment temperature. The hot water washing low-temperature treatment technology generally adopts manual steam or hot water pipelines to carry out manual washing, so that the labor intensity is high, the time consumption is long, and the washing efficiency is not high; the pyrolysis technology is under the condition that does not possess effective oxygen content detection means, with the material heating to four, five hundred degrees carry out pyrolytic reaction, has great potential safety hazard, burns the technique and can also cause very big waste to the not abundant oil resource of our country, in addition, the device equipment that the high temperature treatment technique adopted and the problem of pipeline wearing and tearing and jam easily frequently appear, need often to shut down production and overhaul, production is extremely unstable.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a multistage hot washing screening method and a multistage hot washing screening system for oily sludge sundries, which can screen and classify materials with different sizes in the oily sludge sundries according to sizes, respectively carry out oil removal treatment, and clean dirty oil (generally various oil substances or components mainly derived from crude oil) attached to the sundries.

The technical scheme for realizing the aim of the invention is as follows: the multistage hot washing and screening method for the impurities containing the oil sludge comprises the following steps:

s1: primarily screening the oily sludge impurities;

s2: sequentially carrying out hot washing treatment and multi-stage screening treatment on the undersize materials (screened small particle materials) subjected to primary screening, wherein the materials treated by the first stage screening treatment in the multi-stage screening treatment are discharged materials (indicating discharged small particle materials) subjected to hot washing treatment on the undersize materials, and the materials treated by any one next stage screening treatment are undersize materials subjected to the previous stage screening treatment;

s3: carrying out hot washing treatment on the oversize materials (screened large-particle materials) screened for the first time;

s4: and (4) performing solid-liquid separation on the undersize material subjected to the final-stage screening treatment in S2, and performing oil-liquid-solid three-phase separation on the liquid phase after the solid-liquid separation.

Preferably, in S1, the oily sludge impurity is heated and fluidized, and then primary screening is performed. The heating and fluidization are generally carried out by introducing steam into the oily sludge impurities.

Preferably, in S4, the undersize material after the final stage screening treatment is demulsified, degreased and flocculated, and then subjected to solid-liquid separation. Demulsification and deoiling are generally performed by adding a demulsifier to undersize materials subjected to final screening treatment, and flocculation and precipitation are performed by adding a flocculant to the materials subjected to demulsification and deoiling.

Preferably, the solid-liquid separation and the oil-liquid-solid three-phase separation in S4 are both performed by centrifugal separation.

Preferably, the hot washing treatment of the undersize material comprises the following steps:

s21: soaking and washing the materials;

s22: and (2) carrying out multistage screening on the soaked and washed materials, wherein the materials processed by the first stage of screening treatment are fed materials, the materials processed by any next stage of screening treatment are undersize materials processed by the previous stage of screening treatment, in the conveying process of conveying the undersize materials processed by the previous stage of screening treatment into the next stage of screening treatment, ultrasonic waves are applied to the conveyed materials, so that oil is stripped from the surfaces of the materials, three phases of the materials, oil and water are layered, and the oil floating on the upper layer is collected.

Preferably, in the S21, the mixed system (mixture) of the material and the water for washing is heated and stirred. The heating can be carried out by introducing steam, and the stirring can be carried out by turning (rotating) a roller, arranging a spiral material copying plate in the roller, and carrying out pneumatic stirring (for example, by utilizing the pneumatic force of introducing steam).

Preferably, in the S22, the material on the sieve is washed to remove oil.

Preferably, in S22, the mesh of the screening device used in any one of the next-stage screening treatments is smaller than the mesh of the screening device used in the previous-stage screening treatment.

Preferably, in S22, a material baffle is arranged on the conveying channel for conveying the undersize material subjected to the previous-stage screening treatment into the next-stage screening treatment, and the flow speed of the material is controlled by adjusting the height of the material baffle, so as to control the action time of the material subjected to the ultrasonic wave.

Generally, the interval of constituting the material channel is left between the lower extreme of striker plate and material transfer passage's bottom, highly can realize the regulation to this interval through adjusting the striker plate, and then adjusts liquid level (material top surface) high level among the material transfer passage, changes (reduces) the material flow velocity in the material transfer passage who is located striker plate the place ahead, improves the laminar flow state of main area.

Preferably, in S3, the method includes the steps of crushing the oily sludge sundries, and then performing hot washing and screening treatment on the crushed sundries, wherein the hot washing and screening treatment is performed by adding a chemical and water into the treatment equipment, heating and stirring the chemical and the sundries to be treated in the treatment equipment together, and screening while heating and stirring, the hot washing and screening treatment is performed one or more times, and after each hot washing and screening treatment is completed, the undersized materials and the liquid are discharged.

Preferably, the heating is carried out by introducing steam into the mixed system of the impurities, the medicament and the water, and the mixed system is stirred by adopting steam aeration and/or mechanical stirring.

Preferably, the treatment equipment is provided with a rotary drum and a soaking and washing tank, the rotary drum is a horizontal rotary drum with sieve pores, the bottom of the rotary drum is immersed in soaking and washing liquid in the soaking and washing tank, the soaking and washing liquid is formed by mixing medicament and water added into the treatment equipment, sundries to be treated are located in the rotary drum, and sieved undersize materials fall into the soaking and washing tank.

In the hot washing treatment process, ultrasonic waves can be applied to a mixed system of the materials, the medicament and water, so that the dirty oil is quickly peeled from the materials.

Preferably, the chemical in S3 is a solution of sodium silicate and sodium dodecyl benzene sulfonate, and the mass ratio of sodium silicate to sodium dodecyl benzene sulfonate is 6: 4. Further, the mass ratio of the total amount of the sodium silicate and the sodium dodecyl benzene sulfonate in the medicament to the water is 1: 5. Furthermore, the mass concentration of the sodium dodecyl benzene sulfonate in the mixed liquid (referred to as foam washing liquid or foam washing water) of the medicament and the water added into the treatment equipment is 3.5-4.0%, such as 3.5%, 3.8% or 4.0%.

The multistage hot washing screening method for any impurity containing oil sludge disclosed by the invention can be implemented by adopting the multistage hot washing screening system for any impurity containing oil sludge disclosed by the invention.

Multistage hot washing screening system that contains fatlute debris includes:

the feeding subsystem comprises impurity screening equipment, and the impurity screening equipment is provided with a screening device, a large-particle material outlet and a small-particle material outlet;

the hot washing sieve molecular system comprises small particle material hot washing equipment and multistage screening equipment which are sequentially connected, wherein a small particle material outlet is connected with a feed inlet of the small particle material hot washing equipment, and a screen material outlet of any one upper stage screening equipment is connected with a feed inlet of the lower stage screening equipment;

the centrifugal separation subsystem comprises solid-liquid separation equipment and oil-liquid-solid three-phase separation equipment, wherein an undersize material outlet of the last-stage screening equipment in the multi-stage screening equipment is connected with a feed inlet of the solid-liquid separation equipment, and a liquid phase outlet of the solid-liquid separation equipment is connected with a feed inlet of the oil-liquid-solid three-phase separation equipment;

and the auxiliary subsystem comprises a large-particle material hot washing device, and the large-particle material outlet is connected with a feed inlet of the large-particle material hot washing device.

Preferably, the feeding subsystem further comprises a sundry storage pool for storing coming materials of the oily sludge sundries, a steam inlet pipe is laid on the inner side of the side wall and/or the inner side of the bottom wall of the sundry storage pool, and a steam nozzle or a steam outlet is arranged on the steam inlet pipe and used for introducing steam to heat and fluidize the oily sludge sundries. The oil-containing sludge sundries stored in the sundries storage pool are conveyed to the sundries screening equipment through a conveying device, and the sundries screening equipment is preferably a vibration hopper.

The centrifugal separation subsystem can also include quenching and tempering jar and buffer tank, the undersize material exit linkage of the last stage screening equipment in the multistage screening equipment the feed inlet of quenching and tempering jar, the discharge gate of quenching and tempering jar is connected the feed inlet of buffer tank, the discharge gate of buffer tank is connected solid-liquid separation equipment's feed inlet, the quenching and tempering jar is equipped with the demulsifier import, the buffer tank is equipped with the flocculating agent import.

Preferably, the small particle material hot washing equipment comprises a hot washing device, the hot washing device comprises a horizontal roller and a vertical separation tank, a spiral material copying plate from front to back is arranged on the inner wall of the roller, the front part of the roller is a soaking section, the back part of the roller is a screening section, the soaking and washing section is connected with the screening section through a conical section, the diameter of the screening section is smaller than that of the soaking and washing section, through holes which are used as sieve pores and run through from inside to outside are densely distributed on the wall of the sieve section, the roller passes through the side wall of the separation tank, is rotatably connected with the separation tank, the screening section is positioned in the separation tank, the roller is provided with a rotary driving mechanism for driving the roller to rotate, be equipped with the material conveyer trough in the knockout drum, the material conveyer trough sets up to hypsokinesis slant down in the past, is located the below of screening section, the tank bottom inboard of material conveyer trough is equipped with one or more ultrasonic vibration stick.

The quantity of hot washing device can be a plurality of, a plurality of hot washing device connects gradually around the device, arbitrary adjacent two in the hot washing device, be equipped with vertical interface on the back wall of the knockout drum of hot washing device in the front, in the vertical interface on the knockout drum of hot washing device in the back extends to the knockout drum of hot washing device in the front, with corresponding vertical interface swivelling joint, the lower extreme of the material conveyer trough of hot washing device in the front stretches into the cylinder feed inlet of hot washing device in the back, the screening section's of the cylinder of hot washing device in the back through-hole is less than the screening section's of the cylinder of hot washing device in the front through-hole, the lower extreme of the inlet pipe of hot washing device stretches into the cylinder feed inlet that is located foremost, the play fill of hot washing device sets up the back lower part at the knockout drum that is located last hot washing device, the bottom is equipped with the bin, the lower extreme that is located the material conveyer trough of last hot washing device stretches into in the play fill, the discharge gate is connected with the feed inlet of the first-stage screening equipment in the multi-stage screening equipment.

Preferably, the section is washed to bubble is equipped with first steam spray tube, is located in the section is washed to the bubble be equipped with steam nozzle or steam outlet on the first steam spray tube for to the mixed material of section is washed to the bubble let in steam, realize heating and heat preservation to mixed material, first steam spray tube can follow the rear end of cylinder is passed, stretches into to the section is washed to the bubble.

Preferably, the screening section is provided with a washing water pipe, the washing water pipe positioned in the screening section is provided with a washing water nozzle or a washing water outlet, and the washing water pipe can penetrate through the rear end of the roller and extend into the screening section.

Preferably, a second steam spray pipe is arranged in the separation tank and located above the screening section, and a steam nozzle or a steam outlet facing the screening section is arranged on the second steam spray pipe.

Preferably, the front end of the soaking section is provided with a roller feed inlet, the rear end of the screening section is provided with a conical roller discharge port, a downward large-particle material outlet is formed in the tank wall (generally, the rear wall) of the separation tank, the roller discharge port is positioned right above the large-particle material outlet, the top end of the separation tank is provided with an exhaust port, and the bottom end of the separation tank is provided with a sewage discharge port.

When the equipment is washed to tiny particle material heat includes that a heat washes the device, tiny particle material exit linkage the cylinder feed inlet works as when the equipment is washed to tiny particle material heat includes that a plurality of heat washes the device, tiny particle material exit linkage is the cylinder feed inlet of the device is washed to the forefront heat.

Preferably, the material conveyer trough is equipped with the striker plate, the width of striker plate with the groove width of material conveyer trough cooperatees (allows its relative cell wall of part at the inslot to move, and avoids as far as possible and the clearance between the cell wall is too big to realize effectively blockking the material), installs on the inner wall of knockout drum, be located the top of material conveyer trough bottom, the face (positive face) orientation of striker plate the inslot of material conveyer trough comes the material direction, and its bottom is located in the material conveyer trough, with leave the clearance that constitutes the material passageway between the trough bottom of material conveyer trough, the striker plate is equipped with high adjustment mechanism.

Preferably, the material conveying groove is provided with a matched oil receiving groove, the oil receiving groove is fixedly arranged on the inner wall of the separation tank and is inserted into the material conveying groove from top to bottom, a distance is reserved between the bottom surface of the oil receiving groove and the bottom of the material conveying groove, and the wall of the oil receiving groove facing the material feeding direction in the material conveying groove is lower than the side wall of the material conveying groove. The oil receiving tank is used for collecting floating oil on materials conveyed in the material conveying tank, and the oil receiving tank can be provided with an oil outlet pipe extending to the outer side of the material conveying tank and used for guiding out the floating oil collected in the oil receiving tank.

Preferably, the multi-stage screening apparatus comprises a plurality of screening apparatuses, wherein the screening device of any one next stage screening apparatus has a smaller mesh than the screening device of the previous stage screening apparatus.

Preferably, the large-particle material hot washing device comprises a horizontal rotary drum, the front part of the rotary drum is a soaking and washing section, the rear part of the rotary drum is a discharging section, through holes which are used as sieve meshes and penetrate through the inside and the outside are densely distributed on the side wall of the soaking and washing section, the discharging section is in a cone shape with a gradually reduced inner diameter from front to back, the front end of the soaking and washing section is provided with a rotary drum feeding hole, the rear end of the discharging section is provided with a rotary drum discharging hole, the rotary drum is provided with a rotation driving mechanism for driving the rotary drum to rotate, a soaking and washing groove is arranged below the rotary drum, the bottom of the rotary drum is positioned in the soaking and washing groove, the rotary drum discharging hole is positioned outside the soaking and washing groove, the bottom of the soaking and washing groove is provided with a liquid discharging hole, the liquid discharging hole is provided with a liquid discharging valve, the rotary drum is provided with a feeding hopper, the discharging hole of the feeding hopper extends into the rotary drum feeding hole, and the upper part in the feeding hopper is provided with a double-tooth roller crusher, the large-particle material outlet is connected with the feed inlet of the feed hopper.

The inner wall of the discharge section can be provided with discharge blades which extend inwards, the discharge blades are in a spiral arc shape, the spiral direction is the same as the forward rotation direction (the rotation direction when sundries are subjected to hot washing treatment) of the rotary drum, the front end of the discharge blades is located at or close to the joint of the foam washing screening section and the discharge section, and the rear end of the discharge blades is located at or close to the discharge port of the rotary drum, so that when the rotary drum rotates reversely, the discharge blades can use the spiral inner arc surface of the discharge blades to pick up the sundries and push the sundries to the discharge port of the rotary drum to be discharged, and automatic discharge of the rotary drum is realized.

The soaking and washing tank is preferably in an inverted cone shape, so that the soaking and washing water and undersize materials can flow downwards, and the liquid discharge port is formed in the bottom end of the soaking and washing tank.

Preferably, the bubble washing tank is provided with a steam spray pipe, the steam spray pipe positioned in the bubble washing tank is provided with a plurality of steam nozzles or steam outlets for steam aeration in the bubble washing tank and heating bubble washing water, one or a plurality of steam nozzles or steam outlets face downwards and towards the liquid discharge port, undersize materials are ensured not to be deposited at the bottom of the bubble washing tank through aeration, the liquid discharge port is prevented from being influenced by opening and closing of the liquid discharge valve or blocked, and the rest steam nozzles or steam outlets face upwards, and a mixing system is stirred through aeration.

The inner wall of the foam washing tank can be provided with one or more ultrasonic vibration rods, and when the inner wall of the foam washing tank is provided with a plurality of ultrasonic vibration rods, the ultrasonic vibration rods are uniformly distributed in the foam washing tank.

Preferably, the hot washing equipment further comprises a hood, the rotary drum is located in the hood, the bottom end of the front portion of the hood is in a groove shape and forms the soaking and washing tank, a hood discharge port is formed in the bottom end of the rear portion of the hood and located above the hood discharge port, and an exhaust port is formed in the top of the hood and used for exhausting gas generated in the hot washing treatment process.

Preferably, a water inlet and a medicament inlet are arranged on the side wall of the lower part of the feed hopper, and a flow meter and an electric control valve can be respectively arranged on the water inlet and the medicament inlet or on a pipeline connected with the water inlet and the medicament inlet and used for controlling the amount of water and the amount of medicament introduced into the rotary drum.

The liquid outlet can be connected with a feed inlet of a first-stage screening device in the multi-stage screening device.

Preferably, the auxiliary subsystem can further comprise a back-blending water tank, a dirty oil storage tank and a dosing device, a water phase outlet of the oil-liquid-solid three-phase separation equipment is connected with a water inlet of the back-blending water tank, a water outlet of the back-blending water tank is connected with water inlets of water utilization equipment in the multi-stage hot washing screening system, and the back-blending water tank can be provided with a water replenishing port; an oil phase outlet of the oil-liquid-solid three-phase separation equipment is connected with an oil inlet of the dirty oil storage tank, and the dirty oil storage tank is provided with an oil outlet; the medicine adding device can comprise a plurality of medicine storage boxes for containing different medicines, such as the demulsifier, the flocculant and the medicine used in the S3, and the medicine outlet of each medicine storage box is respectively connected with the medicine inlet of the corresponding medicine applying equipment.

Multistage hot washing screening system can be according to the actual processing condition and the needs of material, the suitable jar of keeping in (mainly used collects and the material of keeping in) or the groove of keeping in (mainly used washing, heating and/or stirring in the transportation of material) that is equipped with between two adjacent equipment in the application.

The invention has the beneficial effects that:

1. the invention can screen and classify materials with different sizes in oil-containing mud sundries according to the size and respectively carry out different oil removal treatments, utilizes the rule that the specific surface area of solid particles determines the difficulty degree of cleaning, and carries out more cleaning treatments compared with materials with larger specific surface area, thereby not only cleaning dirty oil attached to larger sundries such as stones, bolts, gloves and the like, but also cleaning dirty oil attached to small-particle sundries such as stones, gravels, silt, mud and the like (carrying out oil removal treatments of different levels according to different sizes), ensuring that the oil content of discharged materials (discharged materials with different sizes) is less than 2 percent, and realizing the recovery of the dirty oil and the cyclic utilization of water.

2. Before the oil removing treatment is carried out on the oily sludge sundries, steam is firstly introduced into the oily sludge sundries for heating and fluidizing, so that firstly dirty oil attached to the surfaces of the sundries can be removed primarily through fluidizing and cleaning of the steam, the cleaning effect is improved, and secondly, the oily sludge sundries can be heated through the steam, so that the oily sludge sundries meet the feeding condition of a hot washing process, the problem that the traditional hot washing process cannot continuously produce (the oily sludge sundries are frozen in a storage pool) in winter is solved, and the treatment capacity is improved.

3. The hot washing treatment of the undersize material of the invention is respectively carried out different oil removal treatments aiming at solid matters with different sizes in the undersize material, can quickly and effectively clean oil sludge sand and oil stains attached to (smaller) production and household garbage (the cleaning in the hot washing treatment reaches the standard, the same applies below), and effectively solves the problem that the oil sludge sand mixed with the production and household garbage is difficult to clean the oil stains and reaches the unified cleaning standard due to different specific surface areas in the prior art. Especially, the material with small particle size (the undersize material in each stage of screening treatment in the undersize material hot washing treatment, usually fine oil sludge sand) is subjected to multistage soaking washing, screening and ultrasonic treatment, so that the oil stain attached to the fine oil sludge sand can be effectively cleaned, and the oil stain can be discharged after reaching the standard or conveyed to the next treatment process, and the technical problem that the oil stain attached to the fine oil sludge sand is difficult to clean or separate is solved.

4. According to the on-screen material hot washing treatment, the on-screen material subjected to primary screening is subjected to soaking washing and screening, so that silt carried in the material (large production and domestic garbage) can be simply and effectively cleaned and separated, particularly, the impurities (the on-screen material in the screening stage of each hot washing screening treatment) are subjected to multiple hot washing screening treatments, dirty oil attached to the impurities can be effectively cleaned, the separation efficiency of silt is improved, the impurities are ensured to be discharged up to standard, and the environment pollution is avoided.

5. When the invention is used for treating oil-containing sludge sundries, the sundries are degreased by utilizing the cavitation effect generated by ultrasonic waves, on one hand, when the ultrasonic waves act on a mixed system (oil-liquid-solid three-phase mixing), instantaneous negative pressure and instantaneous positive pressure are repeatedly and alternately generated, vacuum cavities are generated in liquid in a half period of generating negative pressure, liquid steam or gas dissolved in the liquid enters the cavities to form bubbles, then in the half period of positive pressure, the bubbles are compressed and broken, and strong pressure (up to thousands of atmospheric pressures) is instantaneously generated to form impact force on solids in the mixed system; on the other hand, the ultrasonic waves can generate obvious reflection action at the heterogeneous interface with different densities, and due to the reflection sound difference, liquid on the interface is stirred violently to form strong impact force on solids in a mixing system, and the impact force strongly scours dirty oil on the surface of the solids, so that oil removal is realized. The cavitation effect that adopts the ultrasonic wave to produce degreases can effectual improvement on the one hand to the deoiling effect of debris, and on the other hand can cooperate with the high temperature that the heating formed, and most bubbles that the supersound formed can directly be in the same place with oil diversity group, form better air supporting effect, make dirty oil be taken away by the water smoothly to can avoid dirty oil to adhere to on debris once more.

Drawings

FIG. 1 is a process flow diagram of the multi-stage hot wash screening system of the present invention;

FIG. 2 is a schematic view of the vibratory hopper of the present invention;

FIG. 3 is a schematic view of the hot washing apparatus of the present invention;

FIG. 4 is a schematic cross-sectional view of the bubble wash section of the thermal wash apparatus of the present invention;

FIG. 5 is a front view of a first steam nozzle of the hot wash apparatus of the present invention;

FIG. 6 is a schematic axial cross-sectional view of the separator tank of the thermal washing apparatus of the present invention;

FIG. 7 is a top view of a material conveying trough of the hot washing apparatus of the present invention;

FIG. 8 is a schematic structural view of an embodiment of the apparatus for hot washing of small particle materials according to the present invention;

FIG. 9 is a schematic view of a partial structure of a feed end of the small particle material hot washing device of the present invention;

figure 10 is a top view of one embodiment of the energy dissipater of the hot wash device of the present invention;

FIG. 11 is a schematic diagram of the structure of the large particle materials hot washing device of the present invention;

FIG. 12 is a schematic diagram of the side view of the feeding process of the large particle material hot washing device of the present invention.

Detailed Description

The invention discloses a multistage hot washing screening method for oily sludge sundries, which screens and classifies materials with different sizes in the oily sludge sundries according to sizes, respectively carries out different oil removal treatments, and cleans dirty oil attached to the sundries, and comprises the following steps:

s1: primarily screening the oily sludge impurities;

s2: sequentially carrying out hot washing treatment and multi-stage screening treatment on the undersize materials (screened small-particle materials such as stones, gravel, silt, mud and the like) subjected to primary screening until the treatment requirements are met, wherein the materials subjected to the first-stage screening treatment in the multi-stage screening treatment are discharged materials (namely discharged small-particle materials) subjected to hot washing treatment on the undersize materials, and the materials subjected to any one next-stage screening treatment are undersize materials subjected to the previous-stage screening treatment;

s3: carrying out hot washing treatment on the oversize material (screened large-particle material such as stone, bolts, gloves and other sundries) subjected to primary screening;

s4: and (4) performing solid-liquid separation on the undersize material subjected to the final-stage screening treatment in S2, and performing oil-liquid-solid three-phase separation on a liquid phase after the solid-liquid separation.

The oil-containing impurities generally refer to impurities with an oil content of 5-20% (wt), a solid content of 20-40% (wt) and a water content of 40-75% (wt).

In S1, the oily sludge impurity is preferably heated and fluidized before being primarily screened. The heating and fluidization are generally carried out by introducing steam into the oily sludge impurities.

In S2, it is preferable that the sieve opening of the sieve device used in any one of the next-stage sieving processes is smaller than the sieve opening of the sieve device used in the previous-stage sieving process, and when a sieve device having no sieve opening (for example, a cyclone sand remover or a cyclone mud remover) is used in a certain-stage sieving process, the particle size of the fine material separated by the sieve device is smaller than the particle size of the undersize material or the particle size of the separated fine material of the sieve device used in the previous-stage sieving process.

In S4, it is preferable that the undersize material subjected to the final stage of screening treatment is subjected to demulsification, degreasing, flocculation and precipitation, and then subjected to solid-liquid separation. Demulsification and deoiling are generally performed by adding a demulsifier to undersize materials subjected to final screening treatment, and flocculation and precipitation are performed by adding a flocculant to the materials subjected to demulsification and deoiling.

The solid-liquid separation and the oil-liquid solid three-phase separation in the S4 are preferably performed by adopting a centrifugal separation mode. For example, a two-phase horizontal screw centrifuge is used for solid-liquid separation, and a three-phase vertical disk centrifuge is used for oil-liquid-solid separation.

The hot washing treatment of the undersize material preferably comprises the following steps:

s21: soaking and washing the materials;

s22: the method comprises the steps of carrying out multistage screening on materials washed by soaking until the materials meet the treatment requirements, wherein the materials treated by the first-stage screening treatment are fed, the materials treated by any next-stage screening treatment are undersize materials treated by the previous-stage screening treatment, applying ultrasonic waves to the conveyed materials in the conveying process of conveying the undersize materials treated by the previous-stage screening treatment into the next-stage screening treatment, so that oil is stripped from the surfaces of the materials, three phases of the materials, oil and water are layered, and collecting oil floating on the upper layer.

In the S21, it is preferable that the mixed system (mixture) of the material and the foam washing water is heated and stirred. The heating can be realized by introducing steam, and the stirring can be realized by turning (rotating) a roller, arranging a spiral material copying plate in the roller, stirring by using pneumatic force (for example, by using the pneumatic force of introducing steam), and the like.

In S22, the materials on the screen subjected to screening treatment at different levels are preferably leached and deoiled, so that the deoiling effect and the discharge standard of the materials on the screen are further ensured.

In S22, the sieve opening of the sieving device used in any next-stage sieving treatment is preferably smaller than the sieve opening of the sieving device used in the previous-stage sieving treatment, so that the undersize materials in each-stage sieving treatment have different particle sizes, and the oil removing treatment of different grades and modes can be conveniently performed on the materials with different particle sizes.

In S22, a material baffle is preferably arranged on a conveying channel for conveying the undersize material subjected to the previous-stage screening treatment into the next-stage screening treatment, the flowing speed of the material is controlled by adjusting the height of the material baffle, the action time of the material subjected to ultrasonic waves is controlled, and the optimal oil removing effect is achieved.

S3, the oily sludge sundries are firstly crushed, then the crushed sundries are subjected to hot washing and screening treatment, the mode of the hot washing and screening treatment is that a medicament and water are added into the treatment equipment, the medicament and the water are heated and stirred together with the sundries to be treated in the treatment equipment, screening is carried out while heating and stirring is carried out, the hot washing and screening treatment is carried out once or for multiple times (until the treatment requirement is met), and after the hot washing and screening treatment is completed every time, undersize materials and liquid are discharged.

The heating is preferably carried out by introducing steam into a mixed system of impurities, medicaments and water, the steam is preferably introduced by adopting an aeration mode, and the mixed system is stirred by utilizing a steam aeration mode and/or a mechanical stirring mode. The heating of mixing system can make the irregular motion of hydrone accelerate, increases the diffusion velocity of sump oil, and under steam aeration and/or mechanical stirring's effect, the contact interface of sump oil and medicament can be increased to the oiliness mud debris, and effectual acceleration cleaning speed improves the cleaning efficiency.

The treatment equipment is preferably provided with a rotary drum and a soaking and washing tank, the rotary drum is a horizontal rotary drum with sieve pores, the bottom of the rotary drum is immersed in soaking and washing liquid of the soaking and washing tank, the soaking and washing liquid is formed by mixing medicament and water added into the treatment equipment, sundries to be treated are located in the rotary drum, and sieved undersize materials fall into the soaking and washing tank. The sundries to be treated are usually subjected to a plurality of times of hot washing screening treatment in the treatment equipment (the specific times are determined by the cleaning effect and the cleaning target) until the sundries are cleaned to meet the treatment requirement.

Ultrasonic waves can be applied to a mixed system of the materials, the medicament and water in the hot washing treatment process, and the stripping of the dirty oil from the materials is accelerated by utilizing the cavitation effect generated by the ultrasonic waves.

The medicament preferably adopts sodium silicate and sodium dodecyl benzene sulfonate solution, is nontoxic, and does not cause secondary pollution to the environment after the materials are treated. The mass ratio of the sodium silicate to the sodium dodecyl benzene sulfonate is 6:4, and the mass ratio of the total amount of the sodium silicate and the sodium dodecyl benzene sulfonate in the medicament to the water is 1: 5. The mass concentration of the sodium dodecyl benzene sulfonate in the soaking and washing water (the mixed liquid of the medicament and the water added into the treatment equipment) is 3.5-4.0%, such as 3.5%, 3.8% or 4.0%. The special components and the proportioning relation of the medicament enable the medicament to have the lipophilic group and the hydrophilic group, when the oily sludge sundries are subjected to hot washing treatment, the lipophilic group can be quickly combined with dirty oil on the sundries, and the combined groups can be dissolved in water and taken away under the action of the hydrophilic group, so that the dirty oil can be quickly separated from the surfaces of the sundries, the separation and removal of the dirty oil are accelerated, and the oil removal efficiency of the oily sludge sundries is improved. The mass concentration range of the effective medicament components in the soaking and washing water is set, so that the activities of the lipophilic group and the hydrophilic group in the soaking and washing water are strongest, on one hand, the cleaning effect on oil sludge impurities is good, and on the other hand, the waste of medicaments can be avoided.

Referring to fig. 1, the invention also discloses a multistage hot washing screening system containing oil sludge sundries, which can be applied to any one of the multistage hot washing screening methods containing oil sludge sundries of the invention to treat the oil sludge sundries, and comprises the following steps:

the feeding subsystem is mainly used for feeding the multistage hot washing and screening system and comprises impurity screening equipment, wherein the impurity screening equipment is provided with a screening device, a large-particle material outlet and a small-particle material outlet;

the hot washing and screening subsystem is mainly used for carrying out hot washing, oil removing and screening treatment on the small granular materials screened out by the sundries screening equipment and comprises the small granular material hot washing equipment and multi-stage screening equipment which are sequentially connected, wherein a small granular material outlet is connected with a feed inlet of the small granular material hot washing equipment, and a screen underflow material outlet of any one upper stage of screening equipment is connected with a feed inlet of the next lower stage of screening equipment;

the centrifugal separation subsystem is mainly used for carrying out-phase separation treatment on the materials treated by the hot washing screening subsystem and comprises solid-liquid separation equipment and oil-liquid-solid three-phase separation equipment, wherein an undersize material outlet of the last-stage screening equipment in the multistage screening equipment is connected with a feed inlet of the solid-liquid separation equipment, and a liquid phase outlet of the solid-liquid separation equipment is connected with a feed inlet of the oil-liquid-solid three-phase separation equipment;

the auxiliary subsystem is mainly used for carrying out hot washing oil removal and screening treatment on large-particle materials screened out by the sundries screening equipment, the equipment is hot washed by the large-particle materials, and a large-particle material outlet is connected with a feed inlet of the large-particle material hot washing equipment.

The feeding subsystem can further comprise an impurity storage pool, an impurity conveying device (such as a gantry crane and a grab bucket) and a vacuum feeding machine (such as a vacuum pump for short), wherein the impurity storage pool is used for storing oil-containing mud impurity incoming materials, the oil-containing mud impurities are usually conveyed (unloaded) to the inside of the impurity storage pool through a mud transport vehicle, a steam inlet pipe is laid on the inner side of the side wall and/or the inner side of the bottom wall of the impurity storage pool, a steam nozzle or a steam outlet is arranged on the steam inlet pipe and used for introducing steam to heat and fluidize the oil-containing mud impurities, the introduced steam pressure is usually 0.3-0.6 MPa (G), and the introduced steam temperature is usually 143-168 ℃. The sundries conveying equipment is used for conveying the oily sludge sundries heated and fluidized in the sundries storage tank to the sundries screening equipment. The oil-bearing mud sundries after being heated and fluidized are subjected to primary screening in the sundries screening equipment, and screened small-particle materials and large-particle materials are discharged from the small-particle material outlet and the large-particle material outlet respectively. The feed inlet of vacuum material loading machine is connected the granule material export of debris screening equipment, the discharge gate of vacuum material loading machine is connected the feed inlet of granule material hot washing equipment for with the granule material that debris screening equipment was sieved is carried extremely granule material hot washing equipment.

Referring to fig. 2, the sundries screening device is preferably a vibrating hopper, the vibrating hopper comprises a hopper 1, a vibrating screen (the screening device) 2 and a chute 3, the upper part of the hopper is columnar, the lower part of the hopper is inverted conical, the upper part and the lower part of the hopper can adopt an integrally formed structure or a split structure, and when the split structure is adopted, the bottom end of the upper part of the hopper is connected with the top end of the lower part of the hopper, or the bottom end of the upper part of the hopper is inserted into the top end of the lower part of the hopper. The vibrating screen is obliquely arranged in the upper portion of the hopper, the inclination angle is usually 10-30 degrees, screen holes of the vibrating screen are preferably rhombic holes, the length of a long diagonal line of the rhombic holes is usually 20-100 mm, the rhombic holes are arranged regularly in a longitudinal and transverse mode, the rhombic holes in any adjacent row are preferably arranged in a staggered mode, namely adjacent sides of any two adjacent rhombic holes in any adjacent row are opposite in parallel, so that the aperture ratio is improved, and the screening efficiency of materials is improved. The top of the hopper is open, the small particle material outlet 4 is arranged at the bottom end of the hopper, the large particle material outlet is arranged on the side wall of the upper part of the hopper and is positioned at the joint of the lower end of the vibrating screen and the side wall of the upper part of the hopper, the chute is arranged outwards and obliquely downwards from the hopper, the top end of the chute is connected with the large particle material outlet (or the large particle material outlet is inserted into the top part of the chute), the bottom end of the chute is connected with the feed inlet or the feeding device of the large particle material hot washing equipment, the large particle material outlet can be provided with a discharge door 6 which can be opened outwards, the side wall of the lower part of the hopper can be provided with a water inlet pipe 7 and a compressed air inlet pipe 8, the compressed air inlet pipe is provided with a nozzle or an outlet facing the small particle material outlet and is used for preventing the small particle material outlet from being blocked by a compressed air aeration mode, meanwhile, the cleaning function can be achieved, and the pressure of the compressed air is usually 0.05-0.3 MPa (G).

Referring to fig. 3-10, the small particle material hot washing device preferably comprises one or more hot washing devices, each hot washing device comprises a horizontal roller 9 and a vertical separation tank 10, each roller is of a cylindrical structure, the inner wall of each roller is covered with a rolled wear-resistant steel plate or is formed by rolling the wear-resistant steel plates so as to improve the structural strength and the corrosion resistance, and the inner wall of each roller is provided with a spiral material copying plate 11 from front to back. Section 12 is washed for the bubble to the front portion of cylinder, and the rear portion is screening section 13, the section is washed to the bubble and is connected through the conic section with the screening section (the cylinder can be the integrated into one piece structure, also can be formed by the multistage welding), the section is washed to the bubble is used for carrying out the bubble to the material and washes, the screening section is used for screening the material, sieves out the tiny particle in the material, the diameter of screening section is less than the diameter of section is washed to the bubble, it has the through-hole that runs through inside and outside as the sieve mesh to gather on the section of thick bamboo wall of screening section, the through-hole is preferably diamond hole. The drum penetrates through the side wall of the separation tank and is rotatably connected with the separation tank (for example, the drum can be connected through a bearing), the screening section is located in the separation tank, and the drum is provided with a rotation driving mechanism for driving the drum to rotate. Be equipped with material conveyer trough 15 in the knockout drum, material conveyer trough sets up to hypsokinesis slant in the past, is located the below of screening section, its feed end is located under the front end of screening section, the discharge end stretches out the knockout drum or is located in the knockout drum, material conveyer trough is used for receiving the follow the little granule material that sieves in the screening section and transmit, the width of material conveyer trough is not less than the diameter of screening section, its projection length on the horizontal plane is greater than the projection length of screening section on the horizontal plane, so that can receive the follow all little granule materials that sieve in the screening section falls. When the small particle material hot washing equipment comprises a plurality of hot washing devices, a plurality of hot washing devices are sequentially connected with one another, any two adjacent hot washing devices are arranged, a longitudinal interface is arranged on the rear wall of the separating tank of the previous hot washing device, the front end of the roller of the subsequent hot washing device extends into the longitudinal interface on the separating tank of the previous hot washing device and is rotatably connected with the corresponding longitudinal interface (for example, the longitudinal interface can be connected through a bearing), the foam washing section of the subsequent hot washing device is lower than the screening section of the previous hot washing device, the lower end of the material conveying groove of the previous hot washing device extends into the feeding hole of the roller of the subsequent hot washing device, the through hole of the screening section of the roller of the subsequent hot washing device is smaller than the through hole of the screening section of the roller of the previous hot washing device, so as to realize multi-stage screening (for example, the small particle material hot washing equipment comprises two hot washing devices, the long diagonal line of the rhombic holes in the screening section of the front hot washing device is 10mm in length, and the long diagonal line of the rhombic holes in the screening section of the rear hot washing device is 3mm in length). The lower extreme of the inlet pipe of equipment is washed to heat stretches into the cylinder feed inlet that is located the foremost device is washed to heat, and the play hopper setting of equipment is washed to heat is being located the rear lower part of last device's is washed to heat knockout drum, and the bottom is equipped with bin outlet 32, and the lower extreme that is located the last device is washed to heat conveying groove is washed to heat stretches into in the play hopper. When the equipment is washed to tiny particle material heat includes that a heat washes the device, the exit linkage multi-stage screening equipment's of material conveyer trough feed inlet works as when the equipment is washed to tiny particle material heat includes that a plurality of heat washes the device, the feed inlet of the first order screening equipment in the multi-stage screening equipment is connected to the bin outlet.

The spiral rotating direction of the shoveling plate is the same as the rotating direction of the roller, so that the materials can be pushed to advance in the rotating process of the roller. The retention time of the materials in the roller (mainly referred to as a soaking section) can be controlled (by adjusting the rotating speed of the roller), and the materials can be picked up, so that the soaking oil removal effect of the materials is improved.

The material copying plate is preferably an angle steel, the outer edge of one straight edge of the angle steel is fixedly connected to the inner wall of the roller, and the outer edge of the other straight edge of the angle steel faces to the rotation direction of the roller. So set up the rotation in-process of cylinder, the material is copied to the flitch when soil cave material gos forward, can copy the material up, improves the bubble and washes deoiling effect.

The rhombic holes are arranged on the wall of the screening section in a longitudinal and transverse regular manner. The rhombic holes in any adjacent row on the cylinder wall of the screening section are preferably arranged in a staggered manner, namely the adjacent edges of any two adjacent rhombic holes in any adjacent row on the cylinder wall of the screening section are parallel and opposite to each other, so that the opening rate is improved, and the screening efficiency of the screening section on materials is improved. The through-hole adopts the rhombus hole, can effectively avoid the material will the stifled dead condition of through-hole takes place, even the material blocks up the through-hole, because the rhombus structure of through-hole, rhombus's four corners department also can have the space, does not influence flush water and greasy dirt in the sieve section flow or reduce to the influence of the flush water and the greasy dirt outflow in the sieve section.

The rotary driving mechanism can be a riding wheel transmission mechanism 16, the riding wheel transmission mechanism comprises a driving riding wheel, a driven riding wheel and an annular wheel fixedly arranged on the outer wall of the roller along the circumferential direction, the diameters of the driving riding wheel and the driven riding wheel are the same, the wheel surfaces of the driving riding wheel and the driven riding wheel are opposite, the driving riding wheel and the driven riding wheel are arranged on a riding wheel support through bearings at the same height, annular grooves are formed in the wheel surfaces of the driving riding wheel and the driven riding wheel, the width of each annular groove is matched with the width of the wheel surface of the annular wheel, the outer edge of the annular wheel is located in the annular grooves of the driving riding wheel and the driven riding wheel, the driving riding wheel is provided with a motor for driving the driving riding wheel to rotate, and the motor is preferably a variable frequency motor. The driving riding wheel is driven to rotate by the variable frequency motor, the annular wheel and the roller are driven to rotate by the friction force between the driving riding wheel and the annular wheel, the driven riding wheel plays an auxiliary supporting role for the annular wheel and the roller, and the rotating speed of the roller is controlled to be 3-10 r/min generally.

The roller can also be provided with a bearing mechanism 17, the bearing mechanism can adopt the same structure with the riding wheel transmission mechanism, a driving riding wheel and a driven riding wheel are not distinguished, and a motor is not arranged. And a space is reserved between the bearing mechanism and the riding wheel transmission mechanism, and the supporting mechanism mainly plays a role in supporting and assisting in rotating the roller.

Through changing riding wheel drive mechanism and/or the riding wheel (including initiative riding wheel and driven riding wheel) of the equidimension not of bearing mechanism, perhaps through adjusting riding wheel drive mechanism and/or the height of bearing mechanism's riding wheel support can be adjusted the axial inclination of cylinder makes the rear end of cylinder is less than the front end, from the top down slope backward in the past, helps the transmission of material in its inside, and inclination controls within 5 usually. Of course, the rear end of the roller is higher than the front end of the roller by adjusting the axial inclination angle of the roller, and the roller is inclined from back to front and from top to bottom, so that the transmission speed of the materials from the soaking section to the screening section is reduced, the soaking time of the materials in the soaking section is increased, and the inclination angle is usually controlled within 5 degrees.

One or more of the support mechanisms may be provided depending on the length of the drum.

The rotation driving mechanism can also adopt a belt wheel transmission mechanism, a gear transmission mechanism or other rotation transmission mechanisms suitable in the prior art.

The section is washed to the bubble preferably is equipped with first steam spray tube, is located in the section is washed to the bubble be equipped with steam jet or steam outlet on the first steam spray tube for to the bubble let in steam in washing the miscellanied material of section, realize heating and heat preservation to miscellanied material, first steam spray tube can be followed the rear end of cylinder passes, stretches into the section is washed to the bubble.

The first steam spray pipe can comprise a first steam inlet pipe 18 and a plurality of semicircular branch pipes 19, the first steam inlet pipe extends into the soaking section from the rear end of the roller along the direction parallel to the axis of the roller, the semicircular branch pipes are positioned in the soaking section (usually positioned at the rear part of the soaking section) and positioned below the first steam inlet pipe, the plane where the semicircular branch pipes are positioned is vertical to the axis of the roller, two ends of each semicircular branch pipe are respectively connected with the first steam inlet pipe through straight pipes, the semicircular diameter of each semicircular branch pipe is smaller than the diameter of the roller, the semicircular radian is preferably the same as the circumferential radian of the roller, a gap is reserved between each semicircular branch pipe and the inner wall of the soaking section (the semicircular branch pipe and the shoveling plate are avoided through reasonable assembly), and the number of the steam nozzles or the steam outlets is multiple, the steam nozzles or the steam outlets are preferably the same in number on each semicircular branch pipe. The inlet end of the first steam inlet pipe typically extends out of the separator tank. Through first steam spray tube can to inject steam in the section is washed to the bubble, both can heating material in the bubble of material washes the in-process, can roll the material under the jet action of steam again to increase the collision between oil and solid, impel the oil phase to break away from the solid surface, improve the bubble and wash the effect.

The screening section is preferably provided with a washing water pipe 21, a washing water nozzle or a washing water outlet 22 is arranged on the washing water pipe in the screening section, and the washing water pipe can penetrate through the rear end of the roller and extend into the screening section. The number of the washing water nozzles or washing water outlets is usually a plurality of nozzles, the nozzles or the washing water outlets are evenly distributed on the section of the washing water pipe which is positioned in the sieve section at equal intervals, and the water inlet end of the washing water pipe usually extends out of the separation tank. Through the washing water pipe, washing water can be introduced into the screening section, materials (especially oversize materials) in the screening section are further washed, the discharging standard is guaranteed, and the temperature of the washing water is usually 60-95 ℃.

And a second steam spray pipe is preferably arranged in the separation tank and positioned above the screening section, and a steam nozzle or a steam outlet facing the screening section is arranged on the second steam spray pipe.

The second steam nozzle may include a second steam inlet 23 and a plurality of arc-shaped branch pipes 24, the second steam inlet pipe extends into the separating tank from the outside of the separating tank along the direction parallel to the axis of the drum, a plurality of arc-shaped branch pipes are positioned in the separating tank (above the screening sections) and are respectively connected with the second steam inlet pipe, the plane of each arc-shaped branch pipe is vertical to the axis of the drum, the radian of the arc-shaped branch pipes is preferably the same as the circumferential radian of the screening section, a plurality of steam nozzles or steam outlets are uniformly distributed on the pipe wall of each arc-shaped branch pipe facing the screening section, a plurality of arc-shaped branch pipes are preferably arranged on the second steam inlet pipe at equal intervals, to increase the area of interaction with the screen section, the number of steam nozzles or steam outlets on each of the curved branch pipes is preferably the same. Through the second steam spray pipe can to the top of sieve section is the injection steam regularly, and the heating is washed the sieve section makes the attached fatlute on the sieve section and the jam the material of through-hole drops, guarantees the screening effect of sieve section.

The first steam spray pipe and the second steam spray pipe can adopt the same steam source, the pressure of the steam is preferably 0.3-0.6 Mpa, the temperature is preferably 143-168 ℃, and the heating and cleaning effects are guaranteed.

The preferred cylinder feed inlet that is equipped with in front end of section is washed to the bubble, the rear end of screening section is equipped with the cylinder discharge gate of toper (from the past to back internal diameter convergent), be equipped with the large granule material export of seting up downwards on the jar wall (usually for the back wall) of knockout drum, the large granule material export can be earlier to the outside of knockout drum stretches out again downwardly opening, the cylinder discharge gate is located directly over the large granule material export, is used for discharging large granule material after the washing in the cylinder, the up-to-standard large granule material of exhaust washing can be sent into the stock dump through conveyor (for example band conveyer), the cylinder discharge gate adopts the cone mouth can play the effect of further receiving water, avoids the wall built-up water of screening section follows the large granule material and discharges, guarantees the aridity of the row material of large granule material. The small-particle materials are screened out through the through holes of the screening sections and fall into the material conveying groove, the top end of the separation tank is provided with an exhaust port for exhausting, exhausted gas (containing oil gas) can be collected and then subjected to subsequent treatment, and the bottom end of the separation tank is provided with a sewage outlet 28 for discharging leaked materials of the material conveying groove and washed dirt during cleaning of equipment. In order to ensure that the bottom of the soaking section can have water with a certain height to soak and wash the materials, the roller feed inlet can be set into a conical opening with a gradually reduced inner diameter from back to front, or the inner side of the roller feed inlet is provided with an annular baffle.

When the small-particle material hot washing equipment comprises a hot washing device, the small-particle material outlet is connected with the roller feed inlet, and when the small-particle material hot washing equipment comprises a plurality of hot washing devices, the small-particle material outlet is connected with the roller feed inlet of the foremost hot washing device.

The material conveying groove usually comprises a groove bottom and vertical groove walls which are fixedly arranged on the left side and the right side of the groove bottom in the length direction, a plurality of ultrasonic vibration rods 29 are preferably arranged on the inner side of the groove bottom, the axial direction of each ultrasonic vibration rod is the same as the length direction of the material conveying groove, and the ultrasonic vibration rods are uniformly distributed in the width direction of the material conveying groove at equal intervals. The length of ultrasonic vibration stick can with the length of material conveyer trough is the same, also can with the length of material conveyer trough is different, work as with the length of material conveyer trough is different, arbitrary adjacent two ultrasonic vibration stick is followed the length direction dislocation set of material conveyer trough. The ultrasonic frequency generated by the ultrasonic vibrating rod is preferably 40kHz, and the power is preferably 50W, so that the optimal 'cavitation' oil removing effect is achieved.

The material conveyer trough is equipped with striker plate 30, the width of striker plate with the groove width of material conveyer trough cooperatees (allows its relative cell wall of part at the inslot to move, and avoids as far as possible and the clearance between the cell wall is too big to the realization effectively blocks the material), vertically locates on the inner wall of knockout drum, be located the top of material conveyer trough bottom, the face (positive face) orientation of striker plate the inslot of material conveyer trough comes the material direction, and its bottom is located in the material conveyer trough, with leave the clearance that constitutes material passageway between the trough bottom of material conveyer trough, the striker plate is equipped with high adjustment mechanism. The material flow in the material conveying groove is effectively blocked by arranging the material baffle plate at the lower part (generally, preferably, a region close to the lower end) of the material conveying groove, the flow area of the corresponding region is controlled by controlling the distance between the material baffle plate and the bottom of the material conveying groove, the height level of the liquid level (the top surface of the material flow) in the material conveying groove is further raised, and the material flow speed in front of the material baffle plate is effectively slowed down; because the material conveying groove is positioned below the screening section of the roller, undersize objects fall into the material conveying groove completely to form stronger collision and impact effects with the material conveying groove and materials in the material conveying groove, oil content (especially larger polymers or agglomerates) attached to the particle surface is effectively stripped through collision, vibration and impact reversing of particulate matters (sand grains), the oil content separation load capacity is reduced for subsequent ultrasonic separation, especially the load capacity of the larger polymers with relatively poorer ultrasonic separation effect is effectively reduced, and the separation effect is effectively improved; owing to can be in certain limit with flow rate control, can eliminate fast and fall the flow disorder and the torrent that lead to because of the material, good laminar flow effect has been guaranteed in the whole, favorable condition is provided for oil content gravity suspension and supersound air supporting, the oil water separation effect at material gliding flow in-process has been guaranteed, because the liquid level is higher than the lower extreme edge of striker plate, make the oil content of suspension on material upper portion can't flow from the passageway of striker plate below, can set up oil content overflow path in the corresponding part of material conveyer trough, for example can collect, hold and carry oil content's oil receiving groove etc. so that draw oil content alone, realize the separation of oil and other materials (the mixture of water and particulate matter).

Height adjusting mechanism can connect including perpendicular soon locking bolt on the face of striker plate, locking bolt is located just stretch out on the back face of striker plate outside the knockout drum, be equipped with on the jar wall of knockout drum and supply locking bolt gliding vertical chute from top to bottom (the width of vertical chute is greater than the diameter of the screw rod of locking bolt is less than the diameter of the head of locking bolt, through slide from top to bottom in the vertical chute locking bolt can adjust the height of striker plate, behind the altitude mixture control to suitable position of striker plate, screw locking bolt realizes right the fixing of striker plate. The inner wall of the separating tank can be provided with a vertical guide rail which plays a guiding role in the material baffle. The height adjustment mechanism may also be any suitable prior art manual or automatic height adjustment mechanism, such as a chain drive or a cylinder drive.

The material conveying groove is preferably provided with a matched oil receiving groove 31, the oil receiving groove is fixedly arranged on the inner wall of the separation tank and is inserted into the material conveying groove from top to bottom, the bottom surface of the oil receiving groove and the groove bottom of the material conveying groove are spaced, material transmission is not affected, and the orientation of the oil receiving groove is that the groove wall of the material conveying groove in the groove feeding direction is lower than the side wall of the material conveying groove. The oil receiving tank is used for collecting floating oil on materials conveyed in the material conveying tank, and the oil receiving tank can be provided with an oil outlet pipe extending to the outer side of the material conveying tank and used for guiding out the floating oil collected in the oil receiving tank and guiding out the floating oil to the separation tank so as to discharge from the sewage outlet.

The working mode of the hot washing device is as follows: the material and the water for soaking and washing the material enter the soaking and washing section from the roller feed inlet, the material is soaked and washed in the soaking and washing section, in the soaking and washing process, the material is transmitted backwards and copied under the action of the copying plate, meanwhile, the material is heated and rolled by introducing steam into the soaking and washing section through the first steam spray pipe, the material after soaking and washing is conveyed to the screening section to be subjected to solid-liquid separation, under the action of the copying plate, large-particle materials (including large-particle sand, stones, production, domestic garbage and the like) are discharged from the roller discharge port, the roller falls into a large-particle material outlet of the separation tank to be discharged, small-particle materials, water and oil are screened out from through holes of the screening section to fall into the material conveying groove and are conveyed to a next-level thermal washing device or a subsequent treatment device to be treated through the material conveying groove, and the screening section is used for screening the material, through wash pipe to let in the sparge water in the sieve section, it is right material (especially material on the sieve) in the sieve section further washs, guarantees that the ejection of compact is up to standard the in-process of material conveying trough transported substance passes through ultrasonic vibration stick produces the ultrasonic wave, utilizes ultrasonic "cavitation" effect to further deoil the material, regularly passes through second steam spray tube lets in steam right the sieve section washs and clear stifled. After the materials are soaked and screened, oil stains, waste water, oil gas and the like are discharged from corresponding discharge ports and collected for subsequent treatment.

When little granule material hot washing equipment includes one during hot washing device, hot washing device is equipped with the inlet pipe, works as little granule material hot washing equipment includes a plurality of during hot washing device, foremost hot washing device is equipped with the inlet pipe, the inlet pipe inclines downwards to insert the cylinder feed inlet from the past, cylinder feed inlet and male can be equipped with labyrinth retaining ring 34 between the inlet pipe, prevent that the material from returning from the cylinder feed inlet and spilling over, the front end of inlet pipe can be through flange joint energy dissipation case 35, the energy dissipation case is equipped with feed inlet 36, debris screening equipment's lower granule material exit linkage the feed inlet of energy dissipation case, the energy dissipation case is used for eliminating the kinetic energy of supplied materials, makes the material be in dwell time in the cylinder is controllable, guarantees soaking, screening effect. Be equipped with sparge water import 37 on the front end pipe wall of inlet pipe, be used for to let in the bubble in the section is washed to the bubble and wash the water, the supplied materials of elimination kinetic energy can slide in the effect of sparge water in the section is washed to the bubble.

The energy dissipation box comprises a cylindrical shell, a long-strip-shaped socket is formed in the top surface of the shell, a baffle 38 is inserted in the socket in a sliding mode, the feed inlet is formed in the side wall of the shell, the axis of the feed inlet is perpendicular to the baffle, and the bottom end of the shell is open and serves as a discharge hole of the energy dissipation box. The baffle is used for blocking feeding from the vertical direction of the feeding port and eliminating kinetic energy, the baffle is of a pull-plug type structure, the baffle can be replaced quickly after being damaged, the replacement operation can be completed within 3-5 minutes generally, and the bottom end of the shell is connected with the feeding end of the feeding pipe through a flange, so that the energy dissipation box can be detached and replaced conveniently.

Taking the small particle material hot washing equipment comprising two hot washing devices as an example, the operation method of the small particle material hot washing equipment comprises the following steps: before the materials are fed from the feed inlet of the energy dissipation box, the rotary driving mechanisms of the rollers of the two hot washing devices are started, the flushing water is introduced through the flushing water port on the feeding pipe, the flushing water is introduced through the flushing water pipes of the two hot washing devices, the first steam spray pipe through two hot washing devices lets in steam, after the observation system operates steadily, let in the material from the feed inlet of energy dissipation case, the adjustment is located the striker plate of preceding hot washing device, make the material that is located the material conveyer trough of preceding hot washing device evenly flow out, the adjustment is located the striker plate of hou mian hot washing device, make the material that is located the material conveyer trough of hou mian hot washing device evenly flow out, the oil slick in two material conveyer troughs is collected through respective oil receiving groove and is discharged, through the bubble wash, the large granule material after the screening, the tiny particle material, the greasy dirt, waste water, oil gas etc. are collected from corresponding export discharge and are carried out subsequent processing. And steam is introduced into the second steam spray pipes of the two hot washing devices for about half an hour every day, respective screening sections are cleaned and blocked, and the baffle of the energy dissipation box is replaced once every week, so that the energy dissipation effect is ensured.

The multi-stage screening device preferably comprises a plurality of screening devices, wherein the screening devices of any next stage of screening device have smaller screen holes than the screening devices of the previous stage of screening device. When a screening device having no screen holes (for example, a cyclone sand remover or a cyclone mud remover) is used in a certain stage of screening treatment, the particle size of the fine material separated by the screening device is smaller than the particle size of the undersize material or the particle size of the separated fine material of the screening device used in the previous stage of screening treatment. The screening equipment can adopt any screening equipment suitable for screening silt in the prior art, such as a vibrating screen, a cyclone desander or a cyclone mud remover and the like.

Multistage screening equipment can include three screening equipment, is first shale shaker, second shale shaker and cyclone in proper order after to in the past, first shale shaker can adopt the screen cloth (for short the gap sieve) that the trompil formed on the monoblock sieve, the second shale shaker can adopt to weave the screen cloth (for short the woven sieve) that forms by stainless steel wire. The material conveyer trough's of equipment is washed to tiny particle material heat outlet (work as when the equipment is washed to tiny particle material heat includes a hot washing device) or bin outlet (work as when the equipment is washed to tiny particle material heat includes a plurality of hot washing device) connect the feed inlet of first shale shaker, the material exit linkage under the sieve of first shale shaker the feed inlet of second shale shaker, the material exit linkage under the sieve of second shale shaker the feed inlet of whirl desander is followed the thin material export exhaust material of whirl desander is sent into the centrifugal separation subsystem is handled on next step. The incoming material is processed by the first vibrating screen to obtain coarse sand which is qualified in processing, processed by the second vibrating screen to obtain fine sand which is qualified in processing, and processed by the cyclone desander to obtain finer silt which is qualified in processing. Oversize material screened by the first and second shakers and coarse material discharged from the cyclone sand separator may be fed to a yard via a conveyor (e.g., a belt conveyor). According to the incoming material condition of the small-particle material hot washing equipment, a cyclone sand remover and a cyclone mud remover can be arranged at the rear end of the second vibrating screen simultaneously to improve the screening effect, and coarse materials discharged by the cyclone sand remover and the cyclone mud remover are usually screened and concentrated again and then sent into a storage yard.

Granule material hot washing equipment with between the first shale shaker, screening equipment at different levels between and the final stage screening equipment with can all be equipped with the washing tank between the centrifugal separation subsystem, can be equipped with heating device (for example steam pipe or electric heater unit), agitating unit (for example stirring rake) and sediment stuff pump in the washing tank, the incoming material is sent into the equipment in back again after the heating stirring, more is favorable to the deoiling of incoming material to be handled through the heating on the one hand, and on the other hand can prevent the silt deposit through the stirring, is convenient for carry.

Centrifugal separation subsystem can also include quenching and tempering jar and buffer tank, the undersize material export or the fine material export (when being equipped with the washing tank, for the material transmission mouth of washing tank) of the last stage screening equipment in the multistage screening equipment are connected the feed inlet of quenching and tempering jar, the discharge gate of quenching and tempering jar is connected the feed inlet of buffer tank, the discharge gate of buffer tank can pass through the screw pump and connect solid-liquid separation equipment's feed inlet, the quenching and tempering jar is equipped with the demulsifier import, the buffer tank is equipped with the flocculating agent import, quenching and tempering jar and buffer tank all can be equipped with the agitator, the agitator can be for the stirring rake.

The solid-liquid separation equipment can be a two-phase horizontal screw centrifuge, and the oil-liquid-solid-three-phase separation equipment can be a three-phase vertical disc centrifuge. The solid-liquid separation equipment with the solid phase outlet exhaust material of fluid solid three-phase splitter can be carried to the yard through conveying equipment (for example screw conveyer) respectively, dirty oil temporary storage tank can be connected to the oil phase export of fluid solid three-phase splitter, the liquid phase outlet of fluid solid three-phase splitter can be connected back to mix water and keep in the jar, dirty oil temporary storage tank with back to mix water and keep in the jar all can be equipped with the delivery pump that is used for external output. The overflow tank can be arranged between the solid-liquid separation equipment and the oil liquid solid three-phase separation equipment and is used for collecting and temporarily storing liquid phase from the solid-liquid separation equipment and stably conveying the oil liquid solid three-phase separation equipment.

The technological parameters of the two-phase horizontal screw centrifuge can be as follows: the diameter of the rotary drum is 360-760 mm, the length of the rotary drum is 1270-3330 mm, the rotating speed of the rotary drum is 1800-3200 r/min, and the differential rotating speed is 0-65 r/min. The technological parameters of the three-phase vertical disc centrifuge can be as follows: the diameter of the rotary drum is 440-620 mm, the sliding piston is 380-7000 mm, and the rotating speed of the rotary drum is 4500-7100 r/min.

Incoming materials of the multi-stage screening equipment are demulsified and deoiled by adding a demulsifier into the conditioning tank, and then enter a buffer tank, adding a flocculating agent into the buffer tank for flocculation and precipitation, then entering the two-phase horizontal screw centrifuge for solid-liquid separation, the two-phase horizontal screw centrifuge performs mechanical centrifugation by using the speed difference between the rotary drum and the screw propeller to obtain qualified mud which is directly discharged, liquid phase containing micro-solid enters the three-phase vertical disc centrifuge to perform oil-water-solid three-phase separation, the three-phase vertical disc centrifuge performs separation by using materials under the action of the high-speed rotary drum, mechanical centrifugation is carried out between a group of discs which are mutually overlapped, a sliding piston controls the slag discharge action, the separated dirty oil is sent to a dirty oil temporary storage tank or a dirty oil temporary storage pool for recycling, the separated water is sent to a water blending temporary storage tank for recycling, and the separated qualified mud is directly discharged.

The traditional hot washing process adopts one of a two-phase centrifuge or a three-phase centrifuge, the two-phase centrifuge can only realize solid-liquid separation, an inclined plate sedimentation tank or a storage tank is usually adopted for oil-water separation in order to recover dirty oil, the oil-water after two-phase centrifugation also contains particles with the particle size of less than 2 microns, so the sedimentation tank or the storage tank often has the problem of siltation, the sedimentation method can not realize complete oil-water separation, if the water phase is not discharged all the time, the oil content in the water is gradually improved to saturation, and the hot washing loses the effect, so in order to maintain the concentration of the oil phase in the water, besides the water lost by evaporation, quantitative oily sewage is also required to be supplemented and discharged; the optimum separation effect of a general three-phase centrifuge is that the solid content is about 1 percent, materials with the solid content more than 3 percent are not received, and the solid content of the oil sludge sand process is difficult to meet the requirement of the independent use of the three-phase centrifuge. The centrifugal separation subsystem adopts a mode of combining a two-phase horizontal screw centrifugal machine and a three-phase vertical disc centrifugal machine, and solves the problems of oil-water separation and low solid content required by the three-phase centrifugal machine respectively.

Referring to fig. 11 and 12, the hot washing device for large granular materials preferably comprises a horizontal drum 39, which is usually made of wear-resistant high manganese steel plate to improve the structural strength and corrosion resistance, and has a front soaking and washing section 40 for soaking, washing and screening the oily sludge sundries and a rear discharging section 41 for discharging the soaked and screened sundries, wherein the drum may be of an integrally formed structure or may be formed by welding two sections. The utility model discloses a washing sieve, including steep wash sieve section, discharge section, drum feed inlet, discharge section, conveyer (such as band conveyer), bubble wash sieve section's lateral wall on the dense through-hole that runs through inside and outside that has the mesh of serving as of having, the discharge section is the taper of internal diameter convergent backward in the past, the front end of steep wash sieve section is equipped with the drum feed inlet, the rear end of discharge section is equipped with the drum discharge gate, follows the debris up to standard of washing that drum discharge gate is discharged can be delivered to the yard through conveyor (such as band conveyer). The rotary drum is provided with a rotary driving mechanism for driving the rotary drum to rotate, and the conical structure of the discharging section can prevent the rotary drum from discharging accidentally in the rotating process. The lower part of rotary drum is equipped with bubble wash bowl 43 for splendid attire bubble wash water, the bottom of rotary drum (or called lower part, specific soaking degree of depth can be according to the technology needs, can be for making some or all materials in it soak in the bubble wash water) be located in the bubble wash bowl to make the debris that are located the bottom in the rotary drum can be in the bubble wash bowl is soaked and washed, for example, the rotary drum is located the height of bubble wash bowl is preferred usually 1/7 ~ 1/5 of the whole height of rotary drum, can make on the one hand debris in the rotary drum obtain effectual bubble wash, and on the other hand debris in the rotary drum can stir and roll under the bubble wash water surface, utilizes the striking with the bubble wash water surface to improve deoiling effect. The discharge port of the rotary drum is positioned outside the soaking and washing tank, and impurities in the rotary drum can be discharged from the discharge port of the rotary drum after soaking and washing (which refers to multiple hot washing and screening treatment) are finished. The bottom in bubble wash tank is equipped with leakage fluid dram 44 for discharge bubble wash water and undersize material, the leakage fluid dram is equipped with flowing back valve 45, the control of being convenient for, the collecting pit can be connected to the leakage fluid dram, collects the flowing back, the export of collecting pit can be connected among the hot washing screening subsystem the granule material hot washing equipment with washing tank between the first shale shaker, rethread back preface equipment is handled. The rotary drum is provided with a feed hopper 55, a discharge hole of the feed hopper extends into a feed inlet of the rotary drum, a double-tooth roller crusher is arranged on the upper part in the feed hopper, and a large-particle material outlet is connected with the feed inlet of the feed hopper.

The opening area of the soaking and washing tank is usually not smaller than the vertical projection area of the rotary drum (mainly referred to as a soaking and washing screen section), so that water carried by materials can fall into the soaking and washing tank completely when the rotary drum rotates.

The soaking and washing screen section can be in a micro-cone shape (the taper is smaller and far smaller than that of the discharging section) with the inner diameter gradually expanding from front to back, so that sundries in the soaking and washing screen section can move to the rear end of the rotary drum by means of gravity in the rotating process of the rotary drum.

Can follow the axial on the inner wall of soaking and washing sieve section and be equipped with inside arch (to soaking and wash sieve section's inner space arch, and orientation the rotation in-process of rotary drum can be stirred stir debris in the rotary drum makes debris roll, is favorable to improving hot washing effect, the quantity of stirring post or stirring piece can be a plurality of, follows the soaking washes the circumference evenly distributed of sieve section to improve the effect of rolling of debris.

Through-hole (the sieve mesh on the screening section is washed to the bubble) is preferred diamond hole, can effectively avoid debris will the dead condition of through-hole shutoff takes place, even debris block up the through-hole, because the rhombus structure of through-hole, rhombus four corners department also can have the space, does not influence the heat and washes the back that finishes of handling bubble washing water and sump oil in the screening section flow or reduce to the influence that bubble washing water and sump oil in the screening section flow is washed to the bubble. The rhombic holes are regularly arranged on the side wall of the soaking and washing screen segment in a longitudinal and transverse mode, the rhombic holes in any adjacent row on the side wall of the soaking and washing screen segment are preferably arranged in a staggered mode, namely the adjacent edges of any two adjacent rhombic holes in any adjacent row on the side of the soaking and washing segment are opposite in parallel, so that the opening rate is improved, and the screening efficiency of the soaking and washing screen segment on sundries is improved. The length of the long diagonal of the diamond-shaped holes is usually 4-6 mm, such as 4mm, 5mm or 6 mm.

The inner wall of the discharge section can be provided with a discharge blade 46 which extends inwards (extends towards the inner space of the discharge section), the discharge blade is in a spiral arc shape, the spiral direction is the same as the positive rotation direction of the rotary drum (the rotation direction when the sundries are subjected to hot washing treatment), the front end of the washing machine is positioned at or close to the joint of the soaking and washing screen section and the discharge section, the rear end of the washing machine is positioned at or close to the discharge port of the rotary drum, so that when the rotary drum rotates reversely, the discharge blade can use the spiral inner arc surface to pick up the sundries and push the sundries to the discharge hole of the rotary drum for discharge, thereby realizing the automatic discharge of the rotary drum, when the rotary drum rotates forwards, the discharge blade can utilize the spiral outer cambered surface to prevent sundries from entering the discharge section, even if the material is accidentally picked up by the spiral outer arc surface of the discharging blade, the material can slide back into the foam washing sieve segment along the outer arc surface. The number of the discharging blades is preferably a plurality of, and the discharging blades are uniformly distributed in the discharging section.

The rotation driving mechanism may include a rotation shaft 47 and a motor 48, the rotation shaft coaxially penetrates through the rotary drum and is fixedly connected with the rotary drum, one end of the rotation shaft is connected with the motor, the other end of the rotation shaft may be mounted on the frame through a bearing and a bearing seat, the motor is usually a variable frequency motor capable of rotating forward and backward, so that the motor can drive the rotary drum to realize variable speed forward rotation and variable speed backward rotation, and normally, the forward rotation speed of the rotary drum is 10r/min in the hot washing process.

Steep and wash in the sieve section and can radially be equipped with a plurality of stiffener 49, the outer end fixed connection of stiffener the inner wall of sieve section, inner fixed connection are washed to the bubble the axis of rotation, in order to improve the sieve sectional structural strength is washed to the bubble, the axis of rotation with can only pass through between the rotary drum the stiffener realizes fixed connection, a plurality of the stiffener is followed the same circumference evenly distributed of sieve section is washed to the bubble.

The soaking and washing tank is preferably in an inverted cone shape (preferably in a pyramid shape), so that soaking and washing water and undersize materials can flow downwards, and the liquid discharge port is formed in the bottom end of the soaking and washing tank.

The bubble washing tank is preferably provided with a steam spray pipe 50, the steam spray pipe positioned in the bubble washing tank is provided with a plurality of steam nozzles or steam outlets for carrying out steam aeration on the bubble washing tank and heating bubble washing water, one or a plurality of steam nozzles or steam outlets face downwards and face towards the liquid discharge port, undersize materials are prevented from silting at the bottom of the bubble washing tank through the aeration effect, the liquid discharge port is prevented from being blocked or opened by the liquid discharge valve, the rest steam nozzles or steam outlets face upwards, and a mixing system is stirred through the aeration effect.

The steam spray pipe can extend into the foam washing tank from the outside of the foam washing tank and is connected with the tank wall of the foam washing tank in a sealing way. An electric control valve is usually arranged on the steam spray pipe, so that steam inlet control is facilitated. The steam passed into the bubble wash tank is typically at a pressure of 0.2mpa (g) and a temperature of typically 130 ℃.

Can be equipped with one or more ultrasonic vibration stick on the inner wall of bubble washtrough, can be located and be close to in the position (the upper portion of bubble washtrough) of rotary drum (bubble washing sieve segmentation), axial extension, it is a plurality of when being equipped with during ultrasonic vibration stick, it is a plurality of ultrasonic vibration stick is in evenly distributed in the bubble washtrough, at the hot washing in-process to the material, can pass through ultrasonic vibration stick applies the ultrasonic wave to mixed system, utilizes the cavitation effect that the ultrasonic wave produced to accelerate the deoiling to the material.

The hot washing device also preferably comprises a hood 52, the rotary drum is positioned in the hood (usually positioned at the front part in the hood), the bottom end of the front part of the hood is groove-shaped and forms the soaking and washing tank, the bottom end of the rear part of the hood is provided with a hood discharge hole 53, the rotary drum discharge hole is positioned above the hood discharge hole, so that discharged materials can be discharged to the outside of the hood through the hood discharge hole, and the top of the hood is provided with an exhaust port for discharging gas generated in the hot washing treatment process. The hood is primarily intended for personal protection and constitutes the wash bowl.

The soaking and washing tank can also be an independent tank arranged in the hood, and when the structure is adopted, the liquid discharge port extends out of the hood, or the liquid discharge port is connected with a liquid discharge pipe, and the liquid discharge pipe extends out of the hood.

The feeder hopper can form a complete set and be equipped with the inlet pipe, through the inlet pipe is connected the rotary drum, the bottom of feeder hopper is connected the upper end of inlet pipe, the lower extreme of inlet pipe stretches into the rotary drum feed inlet, the inlet pipe inclines the setting backward from the past, the feeder hopper with the inlet pipe be used for to carry in the rotary drum and come from the large granule material of debris screening equipment, upper portion in the feeder hopper is equipped with double tooth roller crusher 57 for carry out the breakage to oily mud debris.

The lower end (outlet) of the feeding pipe can be located at the middle position or other suitable positions in the left-right direction on the cross section of the rotary drum where the feeding pipe is located, preferably located at the upper rotating side (the side moving upwards when the rotary drum rotates) of the rotary drum in the left-right direction on the cross section of the rotary drum where the feeding pipe is located, and the lower end (outlet) of the feeding pipe is higher than the liquid level (bubble washing water) in the rotary drum, so that materials falling from the feeding pipe can fall into liquid from the upper side of the liquid level and collide with the liquid level, oil stains on the surface of impurities can be favorably stripped or the attachment of the oil stains on the impurities can be favorably damaged, meanwhile, the falling materials and the materials (including liquid and solid) on the corresponding sides move in opposite directions, the collision acting force among the materials can be favorably improved, and the stripping effect on the oil stains on the materials can be increased.

The double-toothed roller crusher generally comprises two equal-height parallel toothed rollers, the two toothed rollers are respectively provided with a respective driving motor, when the double-toothed roller crusher works, the two toothed rollers are driven to rotate relatively, multiple rows of axially arranged roller teeth (such as six rows) are regularly arranged on each toothed roller along the circumferential direction at equal intervals, the roller teeth on the two toothed rollers are meshed with each other and have intervals (the interval is determined by the particle size of crushed materials), the roller teeth on each toothed roller are preferably inclined towards the other toothed roller from inside to outside, the inclination angle is preferably 75-80 degrees, such as 75 degrees, 78 degrees or 80 degrees, the crushing effect on sundries is favorably improved, the toothed rollers and the roller teeth thereon are preferably integrally cast by wear-resistant high-manganese alloy to improve the structural strength of the toothed rollers, the double-toothed roller crusher is generally provided with current protection, and can automatically rotate in a half-turn after being clamped by the sundries, adjusting the position of the sundries to crush again. Before the large-particle materials from the sundries screening equipment are subjected to hot washing treatment, the materials are crushed by the double-geared roller crusher, on one hand, the size and the property of the supplied materials are not strictly limited, basically all sundries can be effectively cleaned in the large-particle materials hot washing equipment, on the other hand, harder large-particle materials in the sundries can be crushed into small-particle materials, so that the small-particle materials are not easily clamped to influence the operation of the equipment, the equipment can be protected from being impacted by heavy objects, and after the softer materials are crushed, oil sludge and sand wrapped in the softer materials are also more easily washed out.

The upper portion of the feed hopper can be cuboid or square, so that the double-geared roller crusher is convenient to install in the feed hopper, the double-geared roller crusher is convenient to install, the two geared rollers completely or almost completely cover the cross section of the installation position of the double-geared roller crusher, large-particle material leakage in incoming material impurities is avoided, the crushing effect on the impurities is guaranteed, the lower portion of the feed hopper can be inverted pyramid-shaped, and the crushed impurities can be conveyed downwards conveniently.

A water inlet 58 and a medicament inlet 59 are preferably formed in the side wall of the lower portion of the feed hopper or the pipe wall of the feed pipe and used for introducing water and medicament into the rotary drum, and a flow meter and an electric control valve can be respectively arranged on the water inlet and the medicament inlet or on a pipeline connected with the water inlet and the medicament inlet and used for controlling the amount of water and medicament introduced into the rotary drum.

The large particle material hot washing apparatus may be provided with a frame 60 for integral support and fixation of the various components. The feeder hopper can be equipped with loading attachment for to carry the material in the feeder hopper, loading attachment can collect the fill 61 including debris, debris are collected to fight and are equipped with the lift upset actuating mechanism who is used for driving its lift and upset, and in operation, lift upset actuating mechanism drives earlier debris are collected and are fought and rise, work as debris are collected to fight and rise to appointed height (be higher than the height of feeder hopper), drive debris are collected fight to the orientation upset of feeder hopper pours its inside splendid attire material into in the feeder hopper. When the feed hopper is provided with a feeding device, large-particle materials from the impurity screening equipment are firstly fed into the impurity collecting hopper and then conveyed into the feed hopper by the impurity collecting hopper.

Loading attachment can also include two vertical parallel flute profile slide rails (the spout is relative) 62, coaster 63 and branch 64, the upper portion of slide rail to the feeder hopper direction is crooked, the top of slide rail is located the top of feeder hopper, the coaster is installed two through articulating two first pulleys 65 (equal altitude of its on one side of coaster towards the feeder hopper) sliding fit on the slide rail, branch is installed two through articulating two second pulleys 66 (can through with branch is perpendicular and horizontally connecting rod is articulated) sliding fit on the slide rail, the second pulley is located the below of first pulley, the top of branch with the middle part of coaster is articulated, the coaster with be equipped with the grafting structure dismantled of matched with between the debris collection fill.

The lifting and overturning driving mechanism can comprise a hydraulic cylinder, a chain wheel and a chain, the hydraulic cylinder is fixedly installed on the rack, a piston rod of the hydraulic cylinder is vertically upwards, the chain wheel is hinged to the top end of the piston rod, the chain is wound on the chain wheel, one end of the chain is fixed on the rack (lower than the chain wheel), and the other end of the chain is connected to the lower portion of the supporting rod or the connecting rod. After the debris collection fill has collected the material, with it with the coaster passes through can dismantle grafting structural connection, control piston rod rebound, through the chain drives branch with the coaster is followed the slide rail upwards slides, thereby drives debris collection fill rebound, works as debris collection fill stops when removing to the peak (promptly first pulley removes to during the top of slide rail, at this moment debris collection fill is located the top of feeder hopper), the chain drives branch continues to be followed the slide rail upwards slides, branch promotes the coaster reaches debris collection fill to the direction upset of feeder hopper, will the material in the debris collection fill is poured into the feeder hopper. After the sundries collecting hopper pours the materials into the feeding hopper, the piston rod is controlled to move downwards, and the supporting rod and the pulley are driven by the chain to slide downwards along the sliding rail until the sliding rail is reset.

The sundries collecting hopper can be in an irregular cuboid shape, the top end of the sundries collecting hopper is open, one side wall of two opposite side walls is higher than the other side wall, and the top ends of the other two opposite side walls are in an oblique line shape. The sundries collecting hopper adopts the structural shape, when materials are poured into the feeding hopper, the higher side wall faces the feeding hopper generally, so that when the sundries collecting hopper is turned over, the materials in the sundries collecting hopper slide into the feeding hopper along the higher side wall and are not easy to fall out of the feeding hopper. The bottom four corners of the sundries collecting bucket can be provided with idler wheels, so that the sundries collecting bucket is convenient to move, and the outer wall of the lower side wall can be provided with a pushing handle, so that the sundries collecting bucket can be conveniently pushed by hands.

The detachable plug-in structure can include two inserted bars 67 fixedly arranged on the pulley and extending outwards and two slots 68 arranged on the sundries collecting hopper, wherein the two inserted bars are arranged on the left side and the right side of the pulley generally and face away from the direction of the feed hopper, and are equal in height and horizontally parallel, and the slots are arranged on the left side and the right side of the sundries collecting hopper generally, and are parallel in level and equal in height with the inserted bars, and the notches face towards the higher side wall direction of the sundries collecting hopper.

The working mode and the process of the large-particle material hot washing equipment are as follows: after the large-particle materials from the sundry screening equipment are collected by the sundry collecting hopper, the sundry collecting hopper is pushed to enable the inserted bar on the pulley to be inserted into the slot on the sundry collecting hopper, the lifting and overturning driving mechanism is started to lift the sundry collecting hopper, the sundry collecting hopper is overturned after the sundry collecting hopper is lifted to the highest point (the top end of the sliding rail), the materials in the sundry collecting hopper are poured into the feeding hopper, and the sundry collecting hopper is reset after the dumping is finished. And (3) crushing the oily mud sundries by the double-geared roller crusher in the feed hopper, and sliding the crushed materials into the rotary drum. Keeping the drain valve closed, adding a certain amount of medicament and clear water into the rotary drum to a certain liquid level through the water inlet and the medicament inlet, and introducing steam into the soaking and washing tank through the steam spray pipe for cooking and aeration. Start the rotation actuating mechanism of rotary drum makes the rotary drum rotates, and the material is in the sliding collision that takes place that the bottom of rotary drum is not stopped soaks the washing, and tiny silt is peeled off from debris under the combined action of medicament and frictional force, and passes through the through-hole on the screening section is washed to the bubble falls into in the bubble washtrough, treat to wash after certain time, open drainage valve discharge bubble wash water and undersize material (tiny silt), close after the row is clean drainage valve. And introducing clean water, a medicament and steam into the rotary drum again for continuous cleaning, then discharging liquid (including fine silt cleaned further), repeatedly cleaning for several times (impurities meet the cleaning requirement), and stopping cleaning, wherein gas exhausted from the exhaust port during cleaning is collected and treated through a pipeline. The rotary drum is controlled to rotate reversely by the rotary driving mechanism of the rotary drum, and impurities cleaned in the rotary drum are discharged from a discharge port of the rotary drum by the discharge blade, so that the whole cleaning process is completed.

The auxiliary subsystem can further comprise a back-mixing water tank, a dirty oil storage tank and a dosing device, a water outlet of the back-mixing water temporary storage tank is connected with a water inlet of the back-mixing water tank, a water outlet of the back-mixing water tank can be connected with water inlets of water utilization devices in the multi-stage hot washing and screening system, the back-mixing water tank can be provided with a water replenishing port and a steam inlet pipe (used for heating water in the back-mixing water tank), and the temperature of the heated water in the back-mixing water tank is preferably 60-90 ℃; an oil outlet of the sump oil temporary storage tank is connected with an oil inlet of the sump oil storage tank, and the sump oil storage tank is provided with an oil outlet and a conveying pump and is used for conveying collected sump oil; the charge device can include a plurality of medicine storage tanks for the different medicaments of splendid attire, for example demulsifier, flocculating agent and the used medicament of large granule material hot washing equipment etc. each medicine storage tank's play medicine mouth connects the medicine mouth that advances of corresponding medicine equipment respectively, can be equipped with the delivery pump on the connecting tube, each medicine storage tank all can be equipped with the agitator (for example the stirring rake).

The auxiliary subsystem can also comprise an air compressor and is used for providing compressed air of 0.4-1.0 MPa (G) for the vacuum feeding machine.

The steam inlet pipes of all devices in the multistage hot washing screening system containing the oil sludge impurities can adopt the same steam source, the pressure of the introduced steam can be controlled through corresponding valves or steam nozzles, and the temperature of the introduced steam can be controlled through corresponding heat exchange devices.

The multistage hot washing screening system is usually further provided with a PLC control system, the PLC control system is used for controlling the operation of each device, the opening and closing of each valve, the connection and disconnection of each pipeline and the like, and after parameters (such as operation time, cleaning times, rotating speed, water inflow, steam inflow and the like) of each device are set, the multistage hot washing screening system can independently complete hot washing of impurities containing oil sludge without manual participation. The PLC control system can adopt any PLC control system suitable for controlling industrial equipment and systems in the prior art.

The working principle of the multistage hot washing screening method and system for the impurities containing oil sludge is as follows:

the hot washing process of the sundries containing the oil sludge mainly utilizes the process that the oil sludge sundries are separated from the surface of a solid phase to a water phase under the combined action of hot water, a surfactant and mechanical force at a certain temperature in a hot washing screening subsystem and large-particle material hot washing equipment; and then further realizing oil-water-sludge separation in a two-phase centrifuge and a three-phase centrifuge by utilizing the density difference. The size of the specific surface area of the solid particles determines the qualified difficulty of the solid particles in treatment, and the hot washing sieve molecular system is connected with the small particle material hot washing equipment and the multistage sieving equipment in series, so that the material with larger specific surface area is washed more, and the oil content of the discharged material is ensured to be less than 2%.

The working process of the multistage hot washing and screening system for the impurities containing the oil sludge is as follows:

contain the fatlute debris and unload into the debris storage pond through the fatlute transport vechicle, let in steam in the pond and heat the fluidization to contain the fatlute debris, then send to the vibration hopper through the portal crane containing the fatlute debris and carry out the primary screening, produce great stone, the bolt, the iron wire, gloves, the bottle, the sack etc. the domestic waste debris sieve out, then fall into debris collecting hopper from the spout and collect, send to large granule material hot washing equipment and handle, the less mixture such as the stone of all the other sizes, silt particle, profit falls into the lower part of vibration hopper, send to little granule material hot washing equipment through the vacuum material loading machine and handle after adding a certain amount of back water of mixing.

The incoming material of upper reaches vacuum material loading machine is accepted to tiny particle material hot washing equipment, at first eliminate the power that the incoming material brought through the energy dissipation case of its entrance, the incoming material washes the screening treatment through tiny particle material hot washing equipment after, handle qualified big particle diameter material (stone, cloth piece etc.) and fall into band conveyer from the cylinder discharge gate and send the storage yard, tiny particle diameter material (mainly for oil silt sand) falls into the washing tank through the outlet of leakage fluid dram or material conveyer trough, the washing liquid that comes from large particle material hot washing equipment is accepted simultaneously to the washing tank, also play the effect that prevents the silt deposit when stirring hot washing, then send the material to first shale shaker through the sediment stuff pump.

The first vibrating screen receives the incoming material of the upstream slurry pump, large-size particles (coarse sand) on the screen fall into a belt conveyor to enter a storage yard, the particles and oil water penetrating through the gaps of the screen fall into a cleaning tank at the bottom, and the particles and the oil water are conveyed to the second vibrating screen by the slurry pump after being stirred and heated.

The second vibrating screen receives the incoming material of the upstream slurry pump, large-size particles (fine sand) on the screen fall into a belt conveyor to enter a storage yard, the particles and oil water penetrating through the gaps of the screen fall into a washing tank at the bottom, and the particles and the oil water are conveyed to a cyclone sand remover and/or a cyclone mud remover by the slurry pump after being stirred and heated.

The incoming material of upper reaches sediment stuff pump is accepted to whirl sand remover and/or whirl desliming ware, inside the material got into whirl sand remover and/or whirl desliming ware from the entrance tangential, received the centrifugal sedimentation effect, most coarse grain (sand mud) discharged from the underflow opening, pass through (screening equipment, for example weave the sieve) and sieve concentrated back once more and send into the yard by band conveyer, and most fine grain (mud) are discharged from the overflow opening, fall into the washing tank and stir the hot washing, then send to the quenching and tempering jar by the sediment stuff pump.

The conditioning tank receives the incoming material of an upstream slurry pump, part of oil is removed by adding a demulsifier, the material falls into a buffer tank by virtue of gravity, a flocculant is injected into the buffer tank, micro particles in the liquid are concentrated by utilizing the polymerization property of the flocculant, the material after being added with the flocculant is supplied to a two-phase horizontal screw centrifuge by a screw pump, the qualified solid phase (mud) is discharged by the two-phase horizontal screw centrifuge and then falls into a spiral conveyor to be sent to a storage yard, the discharged liquid phase is sent into a three-phase vertical disc centrifuge by an overflow tank, the oil phase separated by the three-phase vertical disc centrifuge is collected by a sump oil temporary storage tank and then is sent to a sump oil storage tank by the sump oil conveyor, the separated water phase is collected by a back-blending water temporary storage tank and then is sent to a back-blending water tank by the back-blending water conveyor, and the qualified solid phase (mud) is sent to the storage yard by the spiral conveyor.

The receiving hopper of the large-particle material hot washing equipment collects oil-containing sundries such as stones, bolts, iron wires, gloves and linoleum screened by the vibrating hopper, the sundries are conveyed into the rotary drum through the feeding hopper by lifting and overturning, the rotary drum is cleaned for many times under the combined action of rotary stirring, steam aeration and medicaments in the rotary drum, the materials qualified in discharge treatment are guaranteed, the materials are conveyed to a storage yard through a belt conveyor, discharged liquid is discharged into a collecting tank, and then the materials are conveyed to the small-particle material hot washing equipment through a submersible sewage pump and a cleaning tank between the first vibrating screens for continuous subsequent treatment.

The back blending water tank receives the water phase separated by the three-phase vertical disk centrifuge, and is maintained at a certain water temperature through steam heating under the condition of supplementing a small amount of water, and a back blending water supply pump provides hot water for other processes.

The dosing device sends the demulsifier solution that will prepare to the quenching and tempering jar through the demulsifier feed pump, passes through flocculating agent feed pump with the flocculating agent that will prepare and sends to the buffer tank, sends into the medicament that will prepare the bubble sink of large granule material hot washing equipment.

The dirty oil storage tank receives the incoming material of the dirty oil temporary storage tank and outputs the incoming material through a dirty oil discharge pump.

The air compressor machine provides compressed air, for vacuum material loading machine air feed behind buffer tank and desicator.

Claims

1. The multistage hot washing screening method for the oil-containing sludge impurities is characterized by comprising the following steps:

s1: primarily screening the oily sludge impurities;

s2: the undersize material of the primary screening is sequentially subjected to undersize material hot washing treatment and multi-stage screening treatment, the material treated by the first stage screening treatment in the multi-stage screening treatment is the discharge material of the undersize material hot washing treatment, the material treated by any next stage screening treatment is the undersize material of the previous stage screening treatment, the sieve pore of the screening device used in any next stage screening treatment is smaller than that of the screening device used in the previous stage screening treatment, so that the undersize material in each stage screening treatment has different particle sizes, the materials with different particle sizes are subjected to oil removal treatment in different grades and modes, in the conveying process of conveying the undersize material of the previous stage screening treatment into the next stage screening treatment, ultrasonic waves are applied to the conveyed material to peel the oil from the surface of the material, the oil and the water are layered, and the oil floating on the upper layer is collected, leaching and deoiling the oversize materials subjected to screening treatment at each level, and further ensuring the deoiling effect and the discharge standard of the oversize materials to be up to standard;

s3: carrying out hot washing treatment on the oversize material subjected to primary screening;

2. The multi-stage hot washing screening method of oily sludge impurities as claimed in claim 1, characterized in that in said S4, the undersize material of the final stage screening treatment is firstly subjected to demulsification, oil removal and flocculation precipitation, and then is subjected to solid-liquid separation.

3. The multi-stage hot washing screening method for the oily sludge impurities as claimed in claim 1 or 2, wherein the hot washing treatment and the multi-stage screening treatment of the undersize materials comprise the following steps:

s21: soaking and washing the materials;

4. The method of claim 3, wherein in S21, the mixture of material and washing water is heated and stirred, and in S22, the material on the screen is rinsed to remove oil.

5. The method according to claim 1 or 2, wherein in step S3, the sludge-containing impurities are crushed, and then the crushed impurities are subjected to a hot-washing screening treatment, wherein the hot-washing screening treatment is performed by adding a chemical agent and water into the treatment equipment, heating and stirring the chemical agent and the water together with the impurities to be treated in the treatment equipment, and screening the impurities while heating and stirring, wherein the hot-washing screening treatment is performed one or more times, and after each hot-washing screening treatment is completed, undersize materials and liquid are discharged.

6. The multi-stage hot washing screening method of the sludge-containing impurities as claimed in claim 5, characterized in that the heating is carried out by introducing steam into the mixed system of the impurities, the medicament and the water, and the mixed system is agitated by steam aeration and/or mechanical agitation.

7. Multistage hot washing screening system that contains fatlute debris, its characterized in that includes:

the hot washing sieve molecular system comprises small particle material hot washing equipment and multistage screening equipment which are sequentially connected, wherein a small particle material outlet is connected with a feed inlet of the small particle material hot washing equipment, an undersize material outlet of any one upper stage screening equipment is connected with a feed inlet of the next lower stage screening equipment, the multistage screening equipment comprises three screening equipment, a first vibrating screen, a second vibrating screen and a cyclone desander are sequentially arranged from front to back, and washing tanks are respectively arranged between the small particle material hot washing equipment and the first vibrating screen, between each stage of screening equipment and between the last stage of screening equipment and a centrifugal separation subsystem;

8. The multi-stage hot washing and screening system for the oil-containing sludge impurities of claim 7, wherein the small particle material hot washing device comprises a hot washing device, the hot washing device comprises a horizontal roller and a vertical separation tank, a spiral material shoveling plate is arranged on the inner wall of the roller from front to back, the front part of the roller is a soaking section, the rear part of the roller is a screening section, the soaking section and the screening section are connected through a conical section, the diameter of the screening section is smaller than that of the soaking section, through holes penetrating from inside to outside and used as screen holes are densely distributed on the wall of the screening section, the roller penetrates through the side wall of the separation tank and is rotatably connected with the separation tank, the screening section is positioned in the separation tank, the roller is provided with a rotary driving mechanism for driving the roller to rotate, a material conveying groove is arranged in the separation tank, and the material conveying groove is obliquely arranged from front to back, and one or more ultrasonic vibration rods are arranged on the inner side of the bottom of the material conveying groove.

9. The multi-stage hot washing screening system for the oily sludge impurities of claim 8, wherein the screen hole of the screening device of any next stage of the multi-stage screening equipment is smaller than the screen hole of the screening device of the previous stage of the multi-stage screening equipment.

10. The multistage hot washing and screening system for the oily sludge impurities as claimed in claim 9, wherein the hot washing equipment for the large granular materials comprises a horizontal rotary drum, the front part of the rotary drum is a soaking and washing section, the rear part of the rotary drum is a discharging section, through holes which are used as sieve pores and penetrate through the inside and the outside are densely distributed on the side wall of the soaking and washing section, the discharging section is in a cone shape with a gradually reduced inner diameter from front to back, the front end of the soaking and washing section is provided with a rotary drum feeding hole, the rear end of the discharging section is provided with a rotary drum discharging hole, the rotary drum is provided with a rotation driving mechanism for driving the rotary drum to rotate, a soaking and washing groove is arranged below the rotary drum, the bottom of the rotary drum is positioned in the soaking and washing groove, the rotary drum discharging hole is positioned outside the soaking and washing groove, the bottom of the soaking and washing groove is provided with a liquid discharging hole, the liquid discharging hole is provided with a liquid discharging valve, the rotary drum is provided with a feeding hopper, and the discharging hole of the feeding hopper extends into the rotary drum feeding hole, the upper portion in the feeder hopper is equipped with double-geared roller crusher, large granule material exit linkage the feed inlet of feeder hopper.