CN115611493A

CN115611493A - High-value utilization system and method for oil-containing sludge

Info

Publication number: CN115611493A
Application number: CN202211257076.3A
Authority: CN
Inventors: 吴小飞; 吴玉祥; 刘旭; 侯傲; 樊蓓莉; 常磊; 尹潇; 李科
Original assignee: Beijing Oriental Landscape Environment Co ltd
Current assignee: Beijing Oriental Landscape Environment Co ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-01-17

Abstract

The invention relates to a high-value utilization system and method for oil-containing sludge, wherein a pretreatment unit comprises a hopper, a stirring tank, a vibrating screen, a spin dryer and a centrifugal separator which are sequentially connected, and the centrifugal separator is used for separating a solid phase and a liquid phase which are separated by the vibrating screen and the spin dryer; the organic matter anaerobic pyrolysis unit comprises a pyrolysis furnace, an oil-gas cooling and purifying system and a pyrolysis gas circulating and recycling system which are sequentially connected with the drying machine; the high-temperature melting fiber extraction unit comprises a high-temperature melting furnace, a high-speed centrifuge, a dry slag discharge device, a wet slag discharge device, a tractor, a dryer and a heat setting machine which are sequentially connected with the pyrolysis furnace. The invention solves the pollution problem of the oily sludge caused by direct incineration, obtains fuel oil, fiber and other energy products with high added value and thoroughly realizes the complete resource recycling of the oily sludge hazardous waste.

Description

High-value utilization system and method for oil-containing sludge

Technical Field

The invention relates to the field of solid waste and environmental protection, in particular to a high-value utilization system and method for oil-containing sludge.

Background

During the development and production of oil fields, a large amount of oily sludge is inevitably generated. Through preliminary investigation, the newly increased yield of the oily sludge in China reaches about 100 ten thousand tons every year, and because the oily sludge contains water, silt, sulfides, benzene series, phenols, hydrocarbons and the like, the oily sludge not only occupies land and space, but also severely pollutes air, soil and underground water, and restricts the development of domestic oil field production to a certain extent. Oily sludge is listed as dangerous solid waste by the nation, so that the development of a treatment technology which can eliminate the harm of the oily sludge to the environment and can recycle resources has important practical significance for the sustainable development of oil fields.

The oil-containing sludge has various types and complex properties, corresponding treatment technologies also present diversified trends, the current oil-containing sludge treatment technologies comprise screening fluidization-tempering-centrifugation technologies, incineration, chemical hot washing, thermal analysis, land cultivation methods, composting methods, biological reactions, solvent extraction technologies and the like, domestic oil fields mostly adopt landfill, concentration dehydration, solidification treatment, catalytic cracking and the like, the common defects are that crude oil with higher economic value cannot be recycled, high-temperature thermal desorption treatment is widely applied to the oil-containing sludge treatment technology at abroad in the future, and harmless, quantitative reduction and resource treatment of the oil-containing sludge can be realized. The oil-containing sludge has different sources, the oil content is different, the low oil content is less than 5%, the high oil content is more than 50%, and if the average value is 20%, nearly 20 ten thousand tons of crude oil can be recycled in a thermal desorption recycling technology year, so that the method has considerable economic value.

The high-temperature pyrolysis gasification is to produce solid, liquid and gaseous products by thermochemical conversion (such as carbonization, pyrolysis and gasification) of the oily sludge, and the products are prepared into energy forms which can be recycled, easily utilized, easily transported and easily stored according to requirements, and can supply heat to generate electricity or be used as raw materials of chemical industry and other industries. Depending on the feedstock and the purpose of the heat treatment, carbonization, gasification, pyrolysis, liquefaction, or other related thermochemical reactions and processes may be used. The pyrolysis gasification adopts various reactor forms, such as a moving bed, a fixed bed, a fluidized bed, an ablative bed, a suspension furnace, a rotary kiln and the like, wherein the industrial production mainly comprises the moving bed, the fixed bed, the rotary kiln and the fluidized bed. For example, publication numbers are: CN208087547U discloses an external heating type rotary kiln hazardous waste carbonization device, the rotary kiln device comprises an external heating type rotary kiln and a secondary combustion chamber, and the pyrolysis gasification device comprises a pyrolysis furnace and a storage chamber for storing combustible flue gas. The solid waste rotary kiln is used as a basis, the supply amount of primary energy is reduced, all systems can be completely combusted, and harmful substances including dioxin are removed through the molecular cracking device in tail gas treatment, so that the higher emission standard is reached. The publication numbers are: CN110375310A discloses a pressurized fluidized bed oily sludge incineration system and an incineration treatment method thereof, wherein the fluidized bed incinerator is added with oily sludge and is pressurized and combusted in a fluidized state, and separated fly ash is used for making bricks; the sensible heat of the generated flue gas is recycled through a waste heat recovery system.

However, the above technique has the following disadvantages: once the residues generated by the multi-hearth furnace can not meet the relevant discharge standard and are still dangerous wastes, the cooled residues need to be further treated to meet the relevant standard requirements. The fluidized bed incineration has high energy consumption, oil product resource products in the oily sludge cannot be recovered, meanwhile, the separated fly ash is used for making bricks, whether the product bricks are suitable for corresponding product standards or not can limit the application scenes of the product bricks, and the product bricks have low added value and are difficult to meet the requirement of long-distance transportation and use. In addition, most of oil sludge is treated by a fluidized bed incineration method because of high viscosity and high oil-containing water content, so that the fluidization effect is poor, dioxin-like toxic gases are easily generated by incineration, and the investment cost for tail gas purification is increased.

In view of the above-mentioned shortcomings of the prior art, it would be desirable to provide a continuous, efficient, high value-added product pyrolysis and high value-added product system.

Disclosure of Invention

The invention aims to provide a system and a method for high-value utilization of oily sludge aiming at the problems in the prior art, so that the oily sludge is reduced, harmless and resource-saving, energy-saving and emission-reducing.

In order to achieve the aim, the invention provides a high-value utilization system for oil-containing sludge, which comprises a pretreatment unit, an organic matter anaerobic pyrolysis unit and a high-temperature melting fiber extraction unit which are sequentially connected;

the pretreatment unit comprises a hopper, a stirring tank, a vibrating screen, a drying machine and a centrifugal separator which are connected in sequence, wherein the centrifugal separator is used for separating a solid phase and a liquid phase which are separated from the vibrating screen and the drying machine;

the organic matter anaerobic pyrolysis unit comprises a pyrolysis furnace, an oil-gas cooling and purifying system and a pyrolysis gas circulating and recycling system which are sequentially connected with the spin dryer, wherein the oil-gas cooling and purifying system comprises a condensing tower, an oil storage tank for storing a liquid mixture obtained by condensation and a gas purifying device for desulfurizing non-condensable gas after condensation treatment;

the high-temperature melting fiber extraction unit comprises a high-temperature melting furnace, a high-speed centrifuge, a dry slag discharging device, a wet slag discharging device, a tractor, a dryer and a heat setting machine which are sequentially connected with the pyrolysis furnace, wherein the tractor is connected with fiber discharging ends of the dry slag discharging device and the wet slag discharging device and is used for feeding fibers subjected to slag removal into the dryer;

and the pyrolysis gas recycling system returns the non-condensable gas of the gas purification device to the pyrolysis furnace and the high-temperature melting furnace.

Preferably, the vibrating screen comprises a primary screening and a secondary screening, the screen holes of the primary screening are square screen holes of 10-20 mm, and the screen holes of the secondary screening are square screen holes of 1-10 mm.

Preferably, the high-temperature melting furnace receives solid materials obtained by pyrolysis of the pyrolysis furnace and partial solid materials obtained by spin-drying of the spin dryer, and the solid materials are subjected to high-temperature melting heating under the action of fuel gas and oxygen enrichment, wherein the heating temperature of the solid materials is 1500-2200 ℃.

Preferably, the high-speed centrifuge is used for high-speed fiber forming by high-speed rotation of four-stage high-speed rotating disks which are arranged in a vertically staggered manner, wherein a first roller with the diameter of 150-200mm and the rotating speed of 3800-4200r/min, a second roller with the diameter of 220-300mm and the rotating speed of 5000-5500r/min, a third roller with the diameter of 350-400mm and the rotating speed of 5500-6000r/min and a fourth roller with the diameter of 350-400mm and the rotating speed of 6000-7000r/min are arranged from top to bottom.

Another object of the present invention is to provide a high-value utilization method for oil-containing sludge, including the steps of:

step A, carrying out hot water washing and stirring on oily sludge, and then carrying out vibration screening, spin-drying and centrifugal separation to obtain oil, water and a solid three-phase component;

b, sending the solid product obtained after pretreatment into a pyrolysis furnace for anaerobic pyrolysis, sending the pyrolyzed solid residue into a high-temperature melting furnace for melting, and providing energy for the pyrolysis furnace and the high-temperature melting furnace by the obtained pyrolysis gas;

step C, throwing the liquid smelted by the high-temperature melting furnace through a high-speed centrifuge to obtain fibers;

and D, sequentially carrying out slag discharge, traction, drying and sizing on the fiber to obtain a fiber finished product.

Preferably, in the step a, when the oily sludge is subjected to hot water washing and stirring, the oily sludge is sent into a hopper device for temporary storage, two thirds of the total volume of hot water is added into a stirring tank, the stirring tank is opened, the temporary stored oily sludge is added into the stirring tank, a sodium silicate medicament with the total mass of 3-5% is added in the stirring process, the stirring tank is heated at constant temperature, the stable control is ensured to be 65 +/-5 ℃, and the stirring time is 20-30 min.

Preferably, the spin-drying mixed liquor in the step A is centrifugally separated at the rotating speed of 4500rpm to obtain three phases of oil, water and solid.

Preferably, the water and organic matters in the solids in the pyrolysis furnace are dried and thermally decomposed at a temperature of 500 to 650 ℃.

Preferably, the temperature of the high-temperature melting furnace is controlled to be 1800-1900 ℃.

Preferably, the drying temperature in step D is controlled to be 100-120 ℃.

Based on the technical scheme, the invention has the advantages that:

the invention adopts the anaerobic pyrolysis device to carry out anaerobic pyrolysis on the oily sludge, can obtain oil energy, can prevent the oily sludge from being directly burnt to generate a large amount of dioxin, and in addition, the obtained pyrolysis gas belongs to clean energy, and the directly burnt waste gas reaches the boiler emission standard.

The high-temperature melting furnace is only used for further burning part of inorganic matters containing a small amount of organic matters difficult to separate, the problem that a large amount of waste gas is generated due to direct incineration of primary oily sludge is greatly reduced, and meanwhile, the high-temperature melting furnace does not contain or only contains a small amount of organic matters, so that the generation of dioxin can be effectively inhibited, the generation of hazardous waste fly ash is avoided, the feeding amount in the high-temperature melting process is reduced, and the energy consumption problem of the whole high-temperature melting system is greatly reduced. The high-temperature melting of solid generated by pyrolysis can be realized through a high-temperature melting fiber extraction system, so that a non-toxic fiber product with a high added value is obtained, the fiber product can be used for building materials and industrial high-temperature-resistant and high-strength-required products, and fuel gas for clean combustion is obtained. The pyrolysis gas fed into the high-temperature melting furnace belongs to clean fuel gas, and waste gas generated by combustion can reach the emission standard of boiler waste gas, so that the waste gas treatment cost of the high-temperature melting furnace is obviously reduced.

The whole process is organically combined, so that on one hand, the problem that inorganic matters and water are subjected to large heat transfer due to direct incineration of oily sludge and the energy utilization rate of the whole system is low can be effectively avoided through the graded treatment process; on the other hand, the pollution problem of the oily sludge caused by direct incineration is solved, and meanwhile, fuel oil, fiber and other energy products with high added value are obtained, so that complete resource recycling of the oily sludge dangerous waste is thoroughly realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:

FIG. 1 is a schematic view of a system for high-value utilization of oily sludge;

FIG. 2 is a process diagram of a high-value utilization method of oily sludge.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

The invention provides a high-value utilization system for oil-containing sludge, which is shown in figures 1 and 2, wherein a preferred embodiment of the invention is shown. The invention solves the environmental protection problem in the prior treatment process and can not be consistent with the resource utilization of dangerous wastes promoted by the prior state, thereby providing a method which can utilize the recoverable resource in the oily sludge, obviously reduce the discharge amount of waste gas and the dioxin in the waste gas, simultaneously recycle the solid slag generated by pyrolysis into high-accessory-value products, and simultaneously reduce a large amount of CO generated by incineration ₂ Greenhouse gases.

As shown in fig. 1, the oil-containing sludge high-value utilization system comprises a pretreatment unit 10, an organic matter anaerobic pyrolysis unit 20 and a high-temperature melting fiber extraction unit 30 which are connected in sequence.

The pretreatment unit 10 comprises a hopper, a stirring tank, a vibrating screen, a drying machine and a centrifugal separator which are connected in sequence, wherein the centrifugal separator is used for separating a solid phase and a liquid phase separated from the vibrating screen and the drying machine. The hopper is used for temporarily storing the oily sludge and supplying continuous materials for a subsequent pretreatment system. The stirring tank is connected with the hopper device and is used for adding drugs into the oily sludge, stirring and treating the oily sludge, introducing warm water with the volume temperature of 1-3 times of 60-80 ℃ into the oily sludge, simultaneously adding 1-8% of sodium silicate medicament by mass, and fully stirring and mixing in the stirring tank.

The stirring tank is connected with the vibrating screen, and the vibrating screen is used for vibrating and separating the fully-stirred mixed liquid. a) The screening device is preferably a multi-stage inclined flat plate type screen, and can be divided into primary screening and secondary screening or multi-stage screening according to the specific condition of the oily sludge; b) The vibrating screen comprises a primary screening and a secondary screening, wherein the screen hole of the primary screening is a square screen hole with the diameter of 10-20 mm, and the primary screening is mainly used for screening and removing fine residue soil in the oily sludge; the sieve pores of the secondary screening are square sieve pores with the diameter of 1-10 mm, and are mainly used for screening out solids in the oily sludge; c) Directly conveying the solid obtained by screening to a spin dryer; d) And delivering the sieved mixed liquid to a spin dryer and a centrifuge through the diameter of a pipeline.

Further, the centrifugal machine is used for further centrifugally separating the screened mixed solution to obtain water, oil and a solid component taking inorganic matters as main components; the drying machine is connected with the vibrating screen, solid-liquid separation is carried out on the solid conveyed by the vibrating screen through the drying machine, and the separated liquid is conveyed to the centrifugal machine; the separated solids are sent to the subsequent units.

As shown in fig. 1, the organic anaerobic pyrolysis unit 20 includes a pyrolysis furnace, an oil-gas cooling and purifying system, and a pyrolysis gas recycling system, which are sequentially connected to the spin dryer, wherein the oil-gas cooling and purifying system includes a condensing tower, an oil storage tank for storing a liquid mixture obtained by condensation, and a gas purifying device for desulfurizing non-condensable gas after condensation treatment. And the pyrolysis gas recycling system returns the non-condensable gas of the gas purification device to the pyrolysis furnace and the high-temperature melting furnace.

The solid with inorganic substances mainly obtained by the separation of the drying machine is sent into the anaerobic pyrolysis system, the organic substances in the solid are thermally decomposed at the temperature of 300-700 ℃, the generated oil-gas mixture is sent into an oil-gas cooling and purifying system through a draught fan, and the liquid mixture obtained by condensation is mainly mixed fuel oil and sent into an oil storage tank for storage and sale; the condensed noncondensable gas is desulfurized through a gas purification device and then returns to the pyrolysis furnace to be used as fuel for pyrolysis;

further, fuel gas required by starting the pyrolysis furnace is provided by external fuel gas, and once the pyrolysis furnace generates pyrolysis gas, the fuel gas required by the pyrolysis furnace is switched to a self-generating fuel gas system by the external fuel gas; and feeding pyrolysis solid products generated by the pyrolysis furnace into a high-temperature melting fiber extraction unit, and feeding part of pyrolysis gas generated by the pyrolysis furnace into the high-temperature melting furnace.

As shown in fig. 1, the high-temperature melting fiber extraction unit 30 includes a high-temperature melting furnace, a high-speed centrifuge, a dry residue discharge device, a wet residue discharge device, a tractor, a dryer, and a heat setting machine, which are sequentially connected to the pyrolysis furnace, wherein the tractor is connected to fiber discharge ends of the dry residue discharge device and the wet residue discharge device to feed the fibers after residue removal into the dryer.

The high-temperature melting furnace is mainly used for receiving solid obtained by pyrolysis of the pyrolysis furnace and part of solid-phase components obtained by spin-drying, and performing high-temperature melting heating under the action of fuel gas and oxygen enrichment, wherein the heating temperature of solid materials is 1500-2200 ℃, organic matters in the materials are completely decomposed and combusted, and the temperature of a high-temperature area can reach 1800-2000 ℃;

further, the required pure oxygen of high temperature melting stove is derived from air separation system, and the flue gas of production carries out denitration treatment through denitrification facility earlier, and the high temperature flue gas after the denitration carries out waste heat recovery through exhaust-heat boiler and utilizes, and the fly ash in the flue gas is collected to rethread dust pelletizing system, then carries out activated carbon adsorption and desulfurization treatment to the flue gas after the dust removal, and the flue gas discharges after up to standard.

The high-speed centrifuge is used for receiving the molten liquid of the high-temperature melting furnace, and the molten liquid is rapidly formed into fibers through high-speed rotation of four-stage high-speed rotating discs which are arranged in a vertically staggered mode. The diameter of the first roller is 150-200mm from top to bottom, the rotating speed is 3800-4200r/min, the diameter of the second roller is 220-300mm, the rotating speed is 5000-5500r/min, the diameter of the third roller is 350-400mm, the rotating speed is 5500-6000r/min, the diameter of the fourth roller is 350-400mm, and the rotating speed is 6000-7000r/min;

furthermore, the dry slag discharging device and the wet slag discharging device are used for receiving the fibers obtained by the high-speed spinning of the high-speed centrifuge, larger particle impurities in the fibers can be separated through the airflow dry slag discharging device, the separated fibers are further processed in the wet slag discharging device, and residual fine particles in the fibers can be further separated, so that high-quality fibers with the fiber quality of more than 98% are obtained; the traction machine is connected with the fiber discharge end of the dry and wet slag discharging device, and the fiber after slag removal is sent into the drying machine; the dryer is connected with the tractor, the temperature of the dryer is set to be 80-150 ℃, and the fiber is heated and dried after passing through the dryer; the heat setting machine is used for receiving the dried fibers, realizing heat setting of the fibers and obtaining a set fiber product which can meet the requirement of back-end packing.

The invention adopts the anaerobic pyrolysis device to carry out anaerobic pyrolysis on the oily sludge, can obtain oil energy, can prevent the oily sludge from being directly burnt to generate a large amount of dioxin, and in addition, the obtained pyrolysis gas belongs to clean energy, and the directly burnt waste gas reaches the emission standard of a boiler.

The high-temperature melting furnace is used for further burning only inorganic matters partially containing a small amount of organic matters difficult to separate, the problem of a large amount of waste gas generated by directly burning primary oily sludge is greatly reduced, and meanwhile, the high-temperature melting furnace does not contain or only contains a small amount of organic matters, so that the generation of dioxin can be effectively inhibited, the generation of fly ash belonging to dangerous waste can be avoided, the feeding amount of the inorganic matters in the high-temperature melting process is reduced, and the energy consumption problem of the whole high-temperature melting system is greatly reduced. The high-temperature melting of solid generated by pyrolysis can be realized through a high-temperature melting fiber extraction system, inorganic matters are converted into non-toxic fiber products with high added values, the non-toxic fiber products can be used for building materials and industrial high-temperature-resistant high-strength required products, and fuel gas for clean combustion can be obtained. The pyrolysis gas fed into the high-temperature melting furnace belongs to clean fuel gas, and the waste gas generated by combustion can reach the emission standard of boiler waste gas, so that the waste gas treatment cost of the high-temperature melting furnace is obviously reduced.

The invention also provides a high-value utilization method of the oil-containing sludge, which comprises the following steps of:

step A, carrying out hot water washing and stirring on oily sludge, and then carrying out vibration screening, spin-drying and centrifugal separation to obtain oil, water and a solid three-phase component; b, sending the solid product obtained after pretreatment into a pyrolysis furnace for anaerobic pyrolysis, sending the pyrolyzed solid residue into a high-temperature melting furnace for melting, and providing energy for the pyrolysis furnace and the high-temperature melting furnace by the obtained pyrolysis gas; step C, throwing the liquid smelted by the high-temperature melting furnace through a high-speed centrifuge to obtain fibers; and D, sequentially carrying out slag discharge, traction, drying and sizing on the fiber to obtain a fiber finished product.

Specifically, when the oily sludge is subjected to hot water washing and stirring in the step A, the oily sludge is sent into a hopper device for temporary storage, hot water with the total volume being two thirds is added into a stirring tank, the stirring tank is opened, the temporary stored oily sludge is added into the stirring tank, a sodium silicate medicament with the total mass being 3-5% is added in the stirring process, the stirring tank is heated at constant temperature, and the stability is ensured to be controlled at 65 +/-5 ℃.

And stirring the oil-containing sludge mixed liquor in a stirring tank for 20-30min, then feeding the oil-containing sludge mixed liquor into a vibrating screen, starting the vibrating screen, and screening the oil-containing sludge mixed liquor. The vibrating screen is provided with an upper layer and a lower layer, and the upper layer of first-level screen holes adopt square screen holes with the screen holes of 20 mm; the lower-layer two-stage sieve mesh adopts a square sieve mesh with the sieve mesh of 5 mm. Through the vibration effect of the vibrating screen, solid-liquid separation is realized, solids are screened out from the discharge end of the screen, and the screened liquid enters the lower part of the vibrating device.

And (3) conveying the solid phase obtained by the secondary vibrating screening into a spin-drying device for further spin-drying treatment, conveying the liquid phase separated by the spin-drying device and the liquid phase obtained after vibrating separation into a centrifugal machine, and centrifugally separating the mixed liquid at the rotating speed of 4500rpm to obtain oil, water and solid phases.

The solid component containing oil content is obtained by centrifugation, the solid obtained by spin-drying is sent into a pyrolysis furnace, organic matters in the solid are dried and thermally decomposed at the temperature of 500-650 ℃ under the heating of the pyrolysis furnace, the generated oil-gas mixture is sent into an oil-gas cooling system through a draught fan, and the liquid mixture obtained by condensation is mainly mixed fuel oil and sent into an oil storage tank for storage and sale; the condensed noncondensable gas is desulfurized through the gas purification device and then returns to the pyrolysis furnace to be used as fuel for pyrolysis.

The solid residue generated by pyrolysis is directly sent into a high-temperature melting furnace, and is fully combusted under the action of fuel gas and oxygen enrichment, and the temperature of the melting furnace is controlled at 1800-1900 ℃. The generated high-temperature flue gas is firstly subjected to denitration treatment by a denitration device, then dust in the flue gas is collected by a dust removal system, and finally the flue gas after dust removal is subjected to activated carbon adsorption and desulfurization treatment.

Vertically flowing the melt into a high-speed centrifugal device, and sequentially passing through a first roller, a second roller, a third roller and a fourth roller, wherein the diameter of the first roller is 180mm from top to bottom, the rotating speed is 3930r/min, the diameter of the second roller is 250mm, the rotating speed is 5120r/min, the diameter of the third roller is 370mm, the rotating speed is 5760r/min, the diameter of the fourth roller is 370mm, and the rotating speed is 6400r/min; the melt liquid is rapidly formed into fibers by the high-speed rotation of four-stage high-speed rotating discs with different diameters and rotating speeds which are arranged in a vertically staggered manner.

Separating larger particle impurities in the fibers by the fibers obtained by spinning through an airflow dry-method slag removal device, further treating the separated fibers in a wet-method slag removal device, and further separating residual fine particles in the fibers to obtain high-quality fibers with the fiber quality of more than 99%; the fiber after dry-method deslagging separation enters a drying machine under the action of a traction device, the fiber is dried in a drying machine at 100-120 ℃, the fiber is sent into a heat setting device for heat setting after moisture is removed, and the obtained final fiber product is packaged and stored.

The whole process is organically combined together, and on one hand, the low energy utilization rate of the whole system caused by the fact that inorganic matters and water take away large amount of heat due to direct incineration of oily sludge can be effectively avoided through the graded treatment process; on the other hand, the pollution problem of the oily sludge caused by direct incineration is solved, and meanwhile, fuel oil, fiber and other energy products with high added values are obtained, so that complete resource recycling of the oily sludge hazardous waste is thoroughly realized.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications of the embodiments of the invention or equivalent substitutions for parts of the technical features are possible; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. The utility model provides an oily sludge high-value utilizes system which characterized in that: comprises a pretreatment unit (10), an organic anaerobic pyrolysis unit (20) and a high-temperature melting fiber extraction unit (30) which are connected in sequence;

the pretreatment unit (10) comprises a hopper, a stirring tank, a vibrating screen, a spin dryer and a centrifugal separator which are connected in sequence, wherein the centrifugal separator is used for separating a solid phase and a liquid phase which are separated by the vibrating screen and the spin dryer;

the organic matter anaerobic pyrolysis unit (20) comprises a pyrolysis furnace, an oil-gas cooling and purifying system and a pyrolysis gas recycling system which are sequentially connected with the spin dryer, wherein the oil-gas cooling and purifying system comprises a condensing tower, an oil storage tank for storing a liquid mixture obtained by condensation and a gas purifying device for desulfurizing the non-condensable gas after condensation treatment;

the high-temperature melting fiber extraction unit (30) comprises a high-temperature melting furnace, a high-speed centrifuge, a dry slag discharge device, a wet slag discharge device, a tractor, a dryer and a heat setting machine which are sequentially connected with the pyrolysis furnace, wherein the tractor is connected with fiber discharge ends of the dry slag discharge device and the wet slag discharge device and sends fibers subjected to slag removal into the dryer;

2. The oil-containing sludge high-value utilization system according to claim 1, wherein: the vibrating screen comprises primary screening and secondary screening, wherein the screen holes of the primary screening are square screen holes of 10-20 mm, and the screen holes of the secondary screening are square screen holes of 1-10 mm.

3. The system for high-value utilization of oily sludge according to claim 1, characterized in that: the high-temperature melting furnace receives solid materials obtained by pyrolysis of the pyrolysis furnace and partial solid materials obtained by spin-drying of the spin dryer, and the solid materials are subjected to high-temperature melting heating under the action of fuel gas and oxygen enrichment, wherein the heating temperature of the solid materials is 1500-2200 ℃.

4. The oil-containing sludge high-value utilization system according to claim 1, wherein: the high-speed centrifuge rapidly forms fibers by rotating four-stage high-speed rotating discs which are arranged in a vertically staggered manner at a high speed, wherein a first roller with the diameter of 150-200mm and the rotating speed of 3800-4200r/min, a second roller with the diameter of 220-300mm and the rotating speed of 5000-5500r/min, a third roller with the diameter of 350-400mm and the rotating speed of 5500-6000r/min, and a fourth roller with the diameter of 350-400mm and the rotating speed of 6000-7000r/min are arranged from top to bottom.

5. A high-value utilization method of oily sludge is characterized by comprising the following steps: the high-value utilization method of the oil-containing sludge comprises the following steps:

6. The method for high-value utilization of oil-containing sludge according to claim 5, wherein: and B, when the oily sludge is subjected to hot water washing and stirring in the step A, sending the oily sludge into a hopper device for temporary storage, adding hot water with the volume being two thirds of the total volume into a stirring tank, starting the stirring tank, adding the temporary stored oily sludge into the stirring tank, adding a medicament with the total mass being 3-5% in the stirring process, heating the stirring tank at constant temperature, ensuring that the temperature is stably controlled at 65 +/-5 ℃, and stirring for 20-30 min.

7. The method for high-value utilization of oily sludge according to claim 5, wherein: and (B) centrifugally separating the spin-dried mixed solution in the step (A) at the rotating speed of 4500rpm to obtain oil, water and solid phases.

8. The method for high-value utilization of oily sludge according to claim 5, wherein: and drying and thermally decomposing water and organic matters in the solid in the pyrolysis furnace at the temperature of 500-650 ℃.

9. The method for high-value utilization of oily sludge according to claim 5, wherein: the temperature of the high-temperature melting furnace is controlled to be 1800-1900 ℃.

10. The method for high-value utilization of oil-containing sludge according to claim 5, wherein: in the step D, the drying temperature is controlled to be 100-120 ℃.