CN220970339U - Modification system for preparing fiber cotton from oily sludge solid residues - Google Patents

Abstract

The utility model discloses a production and modification system for preparing cellucotton by using oily sludge solid residues. The utility model relates to the field of solid waste and environmental protection, and provides a novel treatment method and a novel solution for recycling of oil-containing sludge. The utility model provides a whole set of high-value utilization process of oily sludge, which comprises the following steps: firstly, preprocessing oily sludge, and separating water, oil and solid in the oily sludge; sequentially carrying out ball pressing, drying, high-temperature melting, high-speed centrifugal spinning and fiber extracting, dry and wet slag discharging, long fiber separating, modifying and coarse and fine fiber separating on the obtained solid phase, circularly back mixing the ball residues generated in the long fiber splitting and modifying process into raw materials for recycling, and finally respectively dehydrating and drying the coarse and fine fibers to obtain coarse fiber cotton and fine fiber cotton which can be used for middle and high-end products and building materials; compared with the traditional oil-containing sludge incineration process, the utility model effectively inhibits the generation of dioxin, reduces the generation of hazardous waste, and simultaneously obtains high accessory value products such as mixed oil, coarse and fine fiber cotton and the like.

Description

Modification system for preparing fiber cotton from oily sludge solid residues

Technical Field

The utility model relates to the field of solid waste and environmental protection, in particular to a modification system for preparing cellucotton from oily sludge solid residues.

Background

Sources of oily sludge include mainly oilfield sludge, oil storage tank sludge, and residues of crude oil refining processes. Most of the sludge from the oil tank cleanup is discharged to landfill sites and drainage channels, thereby polluting the ground water. The oily sludge can occupy a large amount of land, and chemical components contained in the sludge can reduce the permeability of soil and destroy the growth environment of microorganisms, so that plant roots are rotted and the ecology is destroyed. Once hydrocarbons, asphaltenes, etc. in the oily sludge diffuse into the atmosphere, they can seriously affect human respiratory tract health, especially aromatic hydrocarbons, and have carcinogenesis.

It is counted that over 300 ten thousand tons of oily sludge are discharged by the petrochemical industry each year in china. At present, the treatment of the oily sludge in the oilfield site still has the problems of non-standardization and non-thoroughness, and more secondary pollution can be generated in the treatment process, so that the environmental problems are not optimistic. The oily sludge has a high calorific value and contains organic volatiles, which can be made a reusable resource from the standpoint of recovering energy or converting it into fuel.

Pyrolysis gasification is the thermochemical conversion (such as carbonization, pyrolysis, gasification) of oily sludge to produce solid, liquid and gaseous products, which are produced into energy forms that can be recovered, easily utilized, transported and stored as required, and can be used for heating and generating electricity or as raw materials in chemical and other industries. Carbonization, gasification, pyrolysis, liquefaction, or other related thermochemical reactions and processes may be employed depending on the feedstock and the purpose of the heat treatment. Pyrolysis gasification is mainly used in industrial production in moving beds, fixed beds, rotary kilns and fluidized beds. For example, the bulletin number is: patent document CN214791135U discloses a rotary kiln incineration system. The rotary kiln body comprises a base with an inclined mounting surface at the top, bearing seats which are arranged at intervals along the inclined direction of the mounting surface, and racks which are meshed with the toothed rings and are rotatably arranged on the base through the bearing seats, wherein the rotary kiln incineration system adjusts the rotary kiln body to swing reciprocally, so that the movement speed of the oily sludge in the kiln is slowed down, the combustion time is prolonged, the purpose of full combustion is achieved, and the incineration treatment effect of the oily sludge is guaranteed. The publication number is: patent document CN110375310a discloses a pressurized fluidized bed oil-containing sludge incineration system and an incineration treatment method thereof. The fluidized bed incinerator is added with oily sludge to be pressurized and burnt in a fluidized state, and the separated fly ash is used for making bricks; the generated flue gas is subjected to sensible heat recovery and utilization through a waste heat recovery system. The utility model realizes the reduction, harmless and recycling of the oily sludge, and saves energy and reduces emission.

But has the following disadvantages: firstly, the residue generated by the incineration of the rotary kiln can not meet the related emission standard, and when the residue is still dangerous waste, the residue after cooling needs to be further treated so as to meet the related standard requirement. The fluidized bed burns energy-consuming height, can't retrieve oil article resourceful product in the oily mud, and the fly ash and the solid sediment that separate out simultaneously obtain glass body and replace partial building materials to be used for paving through high temperature melting, and the additional value of molten glass body product is low and is difficult to satisfy long-distance transportation and use. In addition, most of the oil sludge has high viscosity and high oil and water content, is treated by adopting a fluidized bed incineration method, has poor fluidization effect, and simultaneously is easy to produce dioxin-like highly toxic gas by incineration, so that the investment cost for tail gas purification is increased.

In view of the above-described shortcomings of the prior art, it is desirable to invent a continuous, efficient, high value-added pyrolysis and high value-added product acquisition system.

Disclosure of utility model

The utility model aims to solve the environmental protection problem in the existing treatment process, and can not be consistent with the recycling utilization of dangerous wastes carried out in the existing country, thereby providing a method capable of utilizing the recyclable resources in the oily sludge, remarkably reducing the emission of waste gas and dioxin in the waste gas, recycling the solid slag generated by pyrolysis into high accessory value products, and simultaneously reducing a large amount of CO ₂ greenhouse gases generated by incineration.

The utility model relates to a modification system for preparing cellucotton by oil-containing sludge, which is characterized by comprising a pretreatment unit, a high-temperature melting fiber extraction unit, a slag discharge unit, a fiber modification unit and a slag ball recycling unit which are connected in sequence,

The pretreatment unit comprises a storage device and a centrifugal separation device which are connected with each other, wherein the storage device is used for storing oil-containing sludge, and the centrifugal separation device is connected with an outlet of the storage device;

The high-temperature melting fiber extracting unit comprises a high-temperature melting furnace and a high-speed centrifugal device which are connected with each other, wherein the high-temperature melting furnace is connected with a solid product outlet of the centrifugal separation device, the high-speed centrifugal device is connected with a discharge hole of the high-temperature melting furnace, and the high-speed centrifugal device is arranged to enable molten liquid from the high-temperature melting furnace to form fiber cotton;

The slag discharging unit comprises a dry-wet slag discharging device and a long fiber splitting device which are connected with each other, the slag discharging device is connected with a fiber cotton discharging hole of the high-speed centrifugal device, the dry-wet slag discharging device is used for separating impurities in fiber cotton from the high-speed centrifugal device, the long fiber splitting device is connected with the fiber cotton discharging hole of the dry-wet slag discharging device, and the long fiber splitting device is used for separating long fibers in the fiber cotton from the dry-wet slag discharging device;

The fiber modification unit comprises a modification pool and a dehydration and drying module which are connected with each other, wherein the modification pool is connected with a long fiber discharging hole of the long fiber splitting device, the modification pool is arranged to be capable of modifying the long fibers, and the dehydration and drying module is arranged to be capable of dehydrating and drying the long fibers modified by the modification pool;

The shot recycling unit is arranged to return the shot separated in the long fiber splitting device and the modification pool to the high-temperature melting furnace.

Preferably, the shot recycling unit comprises a forming machine connected with the shot discharge port of the long fiber splitting device and the shot discharge port of the modifying tank, and the forming machine is arranged to enable the mixture of the shot and the additive from the long fiber splitting device and the modifying tank to be pressed into spherical particles.

Preferably, the additive comprises the oily sludge, fly ash, lime and a binder.

Preferably, the mass ratio of the slag balls to the oily sludge to the fly ash to the lime to the binder is 1: (1-2): (0.1-0.4): (0.08-0.1): (0.02-0.1).

Preferably, the diameter of the spherical particles obtained by pressing by the forming machine is 20-30mm.

Preferably, a stirring device and a dosing device are arranged in the modification tank, the stirring device is arranged to stir a mixture of long fibers and water in the modification tank, and the dosing device is arranged to add a modifying agent into the modification tank.

Preferably, the stirring speed of the stirring device is 100-500 r/min; and/or

The modifier comprises silicone oil.

Preferably, the dry-wet slag discharging device comprises an airflow dry slag discharging device and a wet slag discharging device which are sequentially connected, the airflow dry slag discharging device is connected with a fiber cotton discharging port of the high-speed centrifugal device, and the wet slag discharging device is connected with the fiber cotton discharging port of the airflow dry slag discharging device.

Preferably, the fiber modification unit further comprises a coarse and fine fiber separation tank connected to the upper suspension outlet of the modification tank, the coarse and fine fiber separation tank being arranged to separate the upper suspension from the modification tank into coarse and fine fibers.

Preferably, the dewatering and drying module comprises a first dewatering device, a second dewatering device, a first drying device and a second drying device, wherein the first dewatering device is sequentially connected with the first drying device, the second dewatering device is sequentially connected with the second drying device, and the first dewatering device is connected with a crude fiber discharge port of the crude and fine fiber separation tank;

The dehydration drying module further comprises an inclined dehydration device and a thickener which are sequentially connected, wherein the inclined dehydration device is connected with a fine fiber discharge port of the coarse and fine fiber separation tank, the thickener is connected with a discharge port of the inclined dehydration device, and the second dehydration device is connected with a discharge port of the thickener.

The utility model has the advantages that:

The slag balls obtained in the production process of the cellucotton are recycled and are prepared into fibers again, so that the production amount of waste is reduced, and the treatment cost of the waste is reduced. The recycling of the slag balls improves the yield of the prepared fibers of the raw materials and the economic benefit of the whole production process.

The high-temperature melting furnace only carries out further combustion on a part of inorganic matters containing a small amount of organic matters which are difficult to separate, so that the problem that a large amount of waste gas is generated by directly burning primary oily sludge is greatly reduced, meanwhile, the high-temperature melting furnace contains no or only a small amount of organic matters, the generation of dioxin can be effectively inhibited, and the generation of hazardous waste fly ash can be stopped. The feeding amount of 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.

Waste such as oil-containing sludge can be obtained at a lower price, and the cost of the produced inorganic fiber board is relatively low, so that the economy thereof may be higher.

The high-temperature melting fiber extraction system can realize the high-temperature melting of solid matters generated by pyrolysis, and inorganic matters are converted into non-toxic high-added-value fiber products, so that the fiber products can be used in building materials and industrial high-temperature-resistant high-strength required products, and the development of recycling economy is promoted.

The waste is converted into high-quality building materials, so that the energy consumption of quarrying and logistics links can be reduced, the carbon emission is reduced, and the low-carbon development is facilitated.

The oily sludge is converted into the environment-friendly building material, so that diversified application scenes can be provided, and the development of the environment-friendly building material is further promoted.

The whole process is organically combined together, so that on one hand, the problem that inorganic matters and water carry away a large amount of heat due to direct incineration of oil-containing sludge can be effectively avoided, and the energy utilization rate of the whole system is low; on the other hand, the method solves the pollution problem caused by direct incineration of the oily sludge, accords with the current policy of grading recycling of the oily sludge in China, obtains energy products such as fuel oil, fiber and the like with high added value, thoroughly realizes the complete recycling of hazardous wastes of the oily sludge, and on the other hand, the oily sludge residues replace other raw materials, so that the consumption of mineral resources can be reduced, the purpose of saving the resources is achieved, and the method is beneficial to improving the sustainability.

Along with the continuous enhancement of environmental protection requirements, the popularization of environment-friendly building materials has become the current trend, and the environment-friendly building materials prepared from the oily sludge residues can meet the environmental protection requirements.

The method can promote the local production industry to upgrade and promote the regional economic development by developing the green environment-friendly building material industry in a plurality of fields. The green building material is prepared by utilizing the oily sludge solid residues, so that employment opportunities can be created, and the local economic development is promoted.

Drawings

The following describes a schematic diagram of a system for producing and modifying cellucotton from oily sludge solid residues according to the present utility model with reference to the accompanying drawings. In the accompanying drawings:

fig. 1 is a schematic diagram of a modification system for preparing fiber cotton from oily sludge solid residues according to an embodiment of the utility model.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model.

The utility model relates to a production and modification system for preparing fiber cotton from oily sludge solid residues, which comprises an oily sludge pretreatment unit 10, wherein the pretreatment unit usually adopts hot water washing, pyrolysis, solvent extraction and other treatment modes according to different sources and material differences of the oily sludge, and sometimes adopts one or a combination of treatment modes for treatment, such as oily sludge obtained by petroleum exploitation and obtained by precipitation in a sewage tank of a joint station, and the pretreatment unit 10 mainly comprises a pumping device, a storage device, a stirring device and a centrifugal separation device;

The pumping device is used for pumping the oily sludge at the bottom of the sewage pool of the combined station to the storage device, and providing the needed materials for the oily sludge pretreatment unit.

The storage device is used for temporarily storing the oily sludge and supplying continuous materials for a subsequent pretreatment system. Obviously, the oily sludge at the bottom of the sewage tank of the combination station can be transported to the storage device for storage in other ways.

The stirring tank corresponding to the stirring device is connected with the storage device and is used for adding medicine into the oily sludge for stirring treatment, water with the volume ratio of 1:2-4 is introduced into the oily sludge, meanwhile, the agent with the total mass not exceeding 5% is added, the temperature of the whole mixing system is controlled to be 65-75 ℃, the stirring time is controlled to be 30-60 min, and full stirring and mixing are carried out in the stirring tank.

The stirring tank is connected with a centrifugal separation device, and the centrifugal separation device is used for further centrifugally separating the fully mixed liquid to obtain water, oil and inorganic matters as main solid components. Preferably, the centrifugal separation device is a three-phase centrifuge. Obviously, no stirring device is arranged between the storage device and the centrifugal separation device, namely the oily sludge stored in the storage device can be directly introduced into the centrifugal device without being stirred and mixed by the stirring device.

The organic matter anaerobic pyrolysis device comprises an anaerobic pyrolysis furnace, an oil gas cooling and purifying group and a pyrolysis gas recycling system, wherein the anaerobic pyrolysis furnace is connected with a solid product outlet of the centrifugal separation device, the oil gas cooling and purifying group is connected with an oil gas mixture outlet of the anaerobic pyrolysis furnace, one end of the pyrolysis gas recycling system is connected with a noncondensable gas outlet of the oil gas cooling and purifying group, and the other end of the pyrolysis gas recycling system is connected with the anaerobic pyrolysis furnace and the high-temperature melting furnace. The inorganic matters obtained in the centrifugal separation device are taken as main solid components and are heated and decomposed in an anaerobic pyrolysis furnace at 300-700 ℃, and the produced oil-gas mixture is sent into an oil-gas cooling and purifying group for cooling through an induced draft fan. The oil-gas cooling purification group comprises a condensing tower, an oil storage tank for storing a liquid mixture obtained by condensation and a gas purification device for desulfurizing non-condensable gas after condensation treatment, and the oil-gas mixture is condensed in the condensing tower to obtain the liquid mixture and the non-condensable gas. The liquid mixture is mainly mixed fuel oil and is sent to an oil storage tank for storage and sale. The non-condensable gas enters a pyrolysis gas recycling system after desulfurization treatment by a gas purifying device, and is returned to an anaerobic pyrolysis furnace and a high-temperature melting furnace to be used as fuel gas by the pyrolysis gas recycling system. Obviously, the organic matter anaerobic pyrolysis device also does not need to comprise a pyrolysis gas recycling system, and natural gas, liquefied gas and the like are used as fuel gas for the anaerobic pyrolysis furnace and the high-temperature melting furnace.

The pretreatment system may not include an organic matter anaerobic pyrolysis device, and the inorganic matter-based solid component obtained by the centrifugal separation device may be directly fed into a high-temperature melting furnace to be heated at high temperature to obtain a molten liquid.

The utility model relates to a production and modification system for preparing cellucotton by using oily sludge solid residues, which also comprises a high-temperature melting fiber extracting unit, wherein the high-temperature melting fiber extracting unit comprises a forming and drying device, a high-temperature melting furnace, a high-speed centrifugal device, an air flow dry-method slag discharging device, an air flow wet-method slag discharging device, a long fiber dividing device and a finished product packing device.

The shaping and drying device is mainly used for receiving the solid component obtained after pretreatment, mixing and shaping the solid component and the additive, and shaping oval particle materials with the particle size of 5-50 mm, wherein the mass ratio of the solid component to the additive is (1): 0.05 to 0.5, and the additive component is preferably one or a plurality of quartz sand, fly ash and slag, which are combined in proper amounts, so as to finally ensure that the mass content of silicon dioxide in the mixed mixture is 30 to 60 percent and the mass content of aluminum oxide is 5 to 20 percent. And drying the formed solid material by a drying device at 160-350 ℃ to obtain a dried block material.

The high-temperature melting furnace mainly receives solid granules obtained by the forming and drying device, and carries out high-temperature melting heating under the action of fuel gas and oxygen enrichment, wherein the heating temperature of solid materials is above 1600 ℃, for example, 1600-2500 ℃, and the materials are fully melted.

The high-speed centrifugal device is used for receiving the melt of the high-temperature melting furnace, and realizes the rapid formation of the melt into the cellucotton through the high-speed rotation of four-stage high-speed rotating discs which are arranged in an up-down staggered way.

The utility model relates to a modification system for preparing cellucotton from oily sludge solid residues, which also comprises a slag discharging unit 30, wherein the slag discharging unit 30 comprises a dry-wet slag discharging device, a long fiber distributing device and a finished product packaging device which are connected in sequence.

The dry-wet slag discharging device is used for receiving the fiber cotton obtained by the high-speed centrifugal device through high-speed wire throwing, and comprises an airflow dry-method slag discharging device and a wet-method slag discharging device, wherein the airflow dry-method slag discharging device is connected with a fiber cotton discharging hole of the high-speed centrifugal device, and impurities with larger particles are separated from the fiber cotton by high-speed airflow. The wet slag discharging device is connected with a fiber cotton discharging port of the air flow dry slag discharging device, and liquid such as water, silicone oil solvents and the like is utilized to further separate the residual fine particles in the fiber cotton which is primarily separated by the air flow dry slag discharging device. The dry-wet slag discharging device can separate more than 90% of impurities in the fiber cotton to obtain purer mixed fibers.

The dry and wet slag discharging device can also only comprise an airflow dry slag discharging device or a wet slag discharging device.

The long fiber splitting device is used for receiving the fiber cotton obtained after the air flow wet slag discharging device is processed, the long fiber splitting device divides the fiber into long and short fibers, wherein the fiber with the length of more than 20mm is sent into the modification pool to enter the next working procedure, and the mixture formed by mixing the fiber with the length of less than 20mm and the slag balls is sent into the slag ball recycling unit 50.

The utility model relates to a modification system for preparing cellucotton from oily sludge solid residues, which also comprises a fiber modification unit 40, wherein the fiber modification unit 40 comprises a modification tank, a coarse and fine fiber separation tank, a fine fiber oblique dehydration device, a thickener and a dehydration drying module.

The modifying pool is provided with a stirring device and a dosing device, one half to two thirds of water of the solvent of the modifying pool is firstly added into the modifying pool, the fiber cotton obtained by the long fiber splitting device is fed into the modifying pool in a volume of one quarter of water, the adding amount of the modifier is 0.5 to 5 percent of the fiber amount, and the main component of the modifier is silicone oil. After the long fiber is sent into the modification tank, the long fiber and the modification liquid are fully mixed under the action of a stirring device with the rotating speed of 100-500 r/min, the long fiber is modified, and meanwhile, small-particle-diameter impurities attached to the surface of the long fiber are separated from the fiber and are settled to the bottom of the modification tank, the long fiber is scraped out of the modification tank by a screw conveying device, and the residence time of the long fiber in the modification tank is 10-50 min. The impurities settled to the bottom contain a part of the cellucotton, and the cellucotton scraped out of the modification tank by the screw conveyor and the slag ball are sent to the slag ball recycling unit 50.

The coarse and fine fiber separating tank processes the suspension fed in the modifying tank, and adopts centrifugal separation mode to separate coarse and fine fibers effectively, and the separated coarse fibers and fine fibers are fed into subsequent dewatering and drying sections.

The suspension obtained in the modification tank may be directly dehydrated and dried.

The dehydration drying module comprises a first dehydration device, a second dehydration device, the first drying device and the second drying device, wherein the first dehydration device is sequentially connected with the first drying device, the second dehydration device is sequentially connected with the second drying device, the first dehydration device is connected with a crude fiber discharge port of the crude and fine fiber separation tank, the oblique dehydration device is connected with a fine fiber discharge port of the crude and fine fiber separation tank, the thickener is connected with a discharge port of the oblique dehydration device, and the second dehydration device is connected with a discharge port of the thickener.

The crude fiber is dehydrated once by a first dehydration device, wherein the first dehydration device is a vacuum dehydration device which adopts a double-pump drainage structure. The first dewatering device is utilized to dewater fully, the dewatered fibers are in bulk, so that the drying is convenient, and the quality of fiber finished products is ensured. The dehydration process is free from shutdown, continuous operation is stable, and the water content of the dehydrated fiber is reduced to 10-30%.

The first drying device is connected with the first dewatering device and is used for further drying the dewatered fiber, the drying temperature is controlled to be 200-300 ℃, a heating mode of combining hot air convection and radiation is adopted, the drying efficiency is improved, the drying time is shortened, the drying time is controlled to be 10-20 min, and the water content is reduced to be below 2% from 10-30%, so that a crude fiber product is obtained.

The fine fibers firstly enter an inclined dehydration device, the main length of the fine fibers is between 20 and 50mm, 60 percent of the length is concentrated at 20 to 35mm, so that the vacuum dehydrator cannot be directly used for dehydration, and a large amount of water and the fine fibers are subjected to preliminary solid-liquid separation through inclined dehydration to obtain the fine fibers with the water content of 80 to 95 percent. Then the fine fiber is sent into a thickener to be concentrated by the thickener, and the water content of the fine fiber is reduced to below 50 percent after the concentration treatment.

The fine fiber treated by the thickener is sent to a second dewatering device for dewatering, wherein the second dewatering device is a vacuum dewatering device which adopts a double-pump drainage structure. The second dehydration device can be used for fully dehydrating, and the dehydrated fibers are in bulk, so that the drying is convenient, and the quality of fiber finished products is ensured. The dehydration process is free from shutdown, continuous operation is stable, and the water content of the dehydrated fiber is reduced to 10-35%.

The second drying device is connected with the second dewatering device and is used for further drying the dewatered fine fibers, the drying temperature is controlled to be 200-300 ℃, a heating mode of combining hot air convection and radiation is adopted, the drying efficiency is improved, the drying time is shortened, the drying time is controlled to be 10-30 min, and the water content is reduced to be below 4% from 10-35%, so that a fine fiber finished product is obtained.

The modification system for preparing the cellucotton by the solid residues of the oil-containing sludge further comprises a slag ball recycling unit 50, wherein the slag ball recycling unit is arranged to be capable of sending slag balls separated from the long fiber splitting device and the modification pool to a high-temperature melting furnace for remelting to form molten liquid.

The slag balls obtained by separating the long fiber splitting device and the modifying pool are sent back to the forming machine, and are mixed with the oily sludge residues, the fly ash, the lime and the binder and then sent to the forming machine for forming. The mass ratio of the slag balls to the oily sludge residues, the fly ash, the lime and the binder is 1 (1-2): (0.1-0.4): (0.08-0.1): (0.02-0.1). And pressing to obtain elliptic balls with the particle size of 20-30 mm. And (3) conveying the obtained molded oval balls and the oval balls pressed by the oily sludge residues into a drying device for drying, and conveying the oval balls and the oval balls into a high-temperature melting furnace for melting.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims (10)

1. A modification system for preparing fiber cotton from oily sludge solid residues is characterized by comprising a pretreatment unit, a high-temperature melting fiber extraction unit, a slag discharge unit, a fiber modification unit and a slag ball recycling unit which are connected in sequence,

The pretreatment unit comprises a storage device and a centrifugal separation device which are connected with each other, wherein the storage device is used for storing oil-containing sludge, and the centrifugal separation device is connected with an outlet of the storage device;

The high-temperature melting fiber extracting unit comprises a high-temperature melting furnace and a high-speed centrifugal device which are connected with each other, wherein the high-temperature melting furnace is connected with a solid product outlet of the centrifugal separation device, the high-speed centrifugal device is connected with a discharge hole of the high-temperature melting furnace, and the high-speed centrifugal device is arranged to enable molten liquid from the high-temperature melting furnace to form fiber cotton;

The slag discharging unit comprises a dry-wet slag discharging device and a long fiber splitting device which are connected with each other, the slag discharging device is connected with a fiber cotton discharging hole of the high-speed centrifugal device, the dry-wet slag discharging device is used for separating impurities in fiber cotton from the high-speed centrifugal device, the long fiber splitting device is connected with the fiber cotton discharging hole of the dry-wet slag discharging device, and the long fiber splitting device is used for separating long fibers in the fiber cotton from the dry-wet slag discharging device;

The fiber modification unit comprises a modification pool and a dehydration and drying module which are connected with each other, wherein the modification pool is connected with a long fiber discharging hole of the long fiber splitting device, the modification pool is arranged to be capable of modifying the long fibers, and the dehydration and drying module is arranged to be capable of dehydrating and drying the long fibers modified by the modification pool;

The shot recycling unit is arranged to return the shot separated in the long fiber splitting device and the modification pool to the high-temperature melting furnace.

2. The modification system of claim 1, wherein the shot recycling unit comprises a forming machine coupled to the shot discharge port of the filament splitting device and the shot discharge port of the modification tank, the forming machine configured to compress the mixture of shot and additive from the filament splitting device and the modification tank into spherical particles.

3. The modification system of claim 2, wherein the additives include the oily sludge, fly ash, lime, and a binder.

4. The modification system of claim 3, wherein the mass ratio of the shot, the oily sludge, the fly ash, the lime, and the binder is 1: (1-2): (0.1-0.4): (0.08-0.1): (0.02-0.1).

5. The modification system according to any one of claims 2 to 4, wherein the spherical particles obtained by pressing by the molding machine have a diameter of 20 to 30mm.

6. The modification system of claim 1, wherein a stirring device and a dosing device are disposed within the modification tank, the stirring device being configured to stir a mixture of long fibers and water within the modification tank, the dosing device being configured to add a modifying agent into the modification tank.

7. The modification system according to claim 6, wherein the stirring speed of the stirring device is 100 to 500r/min; and/or the modifier comprises a silicone oil.

8. The modification system of claim 1, wherein the dry and wet slag discharging device comprises an air flow dry slag discharging device and a wet slag discharging device which are sequentially connected, the air flow dry slag discharging device is connected with a fiber cotton discharging port of the high-speed centrifugal device, and the wet slag discharging device is connected with a fiber cotton discharging port of the air flow dry slag discharging device.

9. The modification system of claim 1, wherein the fiber modification unit further comprises a coarse and fine fiber separation tank coupled to the upper suspension outlet of the modification tank, the coarse and fine fiber separation tank configured to separate the upper suspension from the modification tank into coarse and fine fibers.

10. The modification system of claim 9, wherein the dewatering and drying module comprises a first dewatering device, a second dewatering device, a first drying device and a second drying device, the first dewatering device is sequentially connected with the first drying device, the second dewatering device is sequentially connected with the second drying device, and the first dewatering device is connected with a crude fiber discharge port of the crude and fine fiber separation tank;

The dehydration drying module further comprises an inclined dehydration device and a thickener which are sequentially connected, wherein the inclined dehydration device is connected with a fine fiber discharge port of the coarse and fine fiber separation tank, the thickener is connected with a discharge port of the inclined dehydration device, and the second dehydration device is connected with a discharge port of the thickener.