Method and system for co-processing waste tires based on microwave pyrolysis and product steel process

Abstract

The invention discloses a method for co-processing a waste tire based on microwave pyrolysis and a product steel process. The method comprises the following steps: S1, carrying out wire drawing on the waste tire; s2, carrying out crushing and magnetic separation to obtain steel wires, other magnetic substances and non-magnetic substances; s3, the steel wires and the other magnetic substances are conveyed to a converter or an electric furnace; s4, performing microwave pyrolysis on the non-magnetic substance to obtain an oil-gas mixture and pyrolysis residues; and S5, the oil-gas mixture is conveyed to a coke oven gas system, and the pyrolysis residues are conveyed to a rotary hearth furnace. The invention further discloses a system for co-processing the waste tires based on the microwave pyrolysis and the product iron and steel process. According to the method, the microwave pyrolysis process of the waste tires is tightly combined with the existing working procedures of the steel plant, and the adverse effect of the waste tires on the environment can be avoided in a co-processing mode.

Description

Technical Field

[0001] The invention relates to comprehensive utilization of waste tires and raw material pretreatment technology, and more specifically, to a method and system for co-disposing waste tires based on microwave pyrolysis and product steel process. Background Art

[0002] At present, as the pollution of waste rubber becomes more and more serious, waste rubber has become another major pollution after white pollution - black pollution. How to effectively recycle and prevent environmental pollution is not only a global problem, but also a new issue facing the recycling of renewable resources in my country.

[0003] According to the Tire Business Network, the comprehensive utilization of waste tires mainly includes retreading, recycled rubber, rubber powder, thermal energy utilization and pyrolysis. With the development of science and technology, the high-quality and low-cost synthetic rubber has made the market for tire retreading and recycled rubber smaller and smaller. The market growth rate has continued to decline since 2012, and is limited by many problems such as technical level and production equipment. The use of tire rubber powder as an ingredient to produce road asphalt is also too costly to be used in large quantities. Incinerating waste tires with other wastes to recover energy in the form of steam or electricity can process a large number of waste tires, but the resource utilization rate is not high, and only about 42% of the energy can be recovered. In addition, retreading, manufacturing rubber powder and recycled rubber, as asphalt filler, and direct burning as fuel will more or less bring secondary pollution, waste of resources, and harm to residents' health, and are not the ultimate solution. At present, only 50% of waste tires are reasonably recycled. Due to the large amount of waste tires and the difficulty in processing, more and more social attention has been drawn.

[0004] There are many patents on the comprehensive utilization of waste tires, mainly including the following aspects:

[0005] 1) Comprehensive utilization after crushing or traditional cracking of waste tires. For example, patent CN97111088.3 uses a mechanical method to divide waste tires into tire rims, tread rubber, sidewalls, tire tops, cord belts and scraps, and then processes and produces waste steel wire, short fibers, waste rubber powder, activated rubber powder and cord layers, etc., as recycled raw materials for other rubber products. Chinese patent 201010013604.1 discloses a waste tire rubber powder modified asphalt and a preparation method thereof, wherein waste tire rubber powder and asphalt are mixed in a certain proportion and processed for paving and maintenance of municipal roads. Chinese patent 201610508043.X discloses a method for processing activated waste tire rubber powder, emulsified asphalt, sand, etc. into anti-aging road modified asphalt. Chinese patent 201410215266.8 discloses a method for preparing asphalt using C heavy aromatic residue oil and waste tire rubber powder. Chinese Patent 201410489090.5 discloses a comprehensive utilization process of waste tire powder by plasma pyrolysis and gasification. Chinese Patent 201310701158.7 discloses a method for preparing a composite dry powder material from blast furnace slag and waste rubber powder, which can be used for roads, buildings or seaport projects. Chinese Patent 201610570019.9 discloses a method for preparing reclaimed rubber by mixing oilfield sludge with waste tire powder and other substances. Chinese Patent 201210229073.9 discloses a waste tire fluidized bed steam low-temperature dry distillation system, including pretreatment such as wire drawing and crushing, and oil and gas condensation, separation, sewage purification and other processes. Chinese Patent 201611097363.7 discloses a method for rapid pyrolysis of waste tires through a reduction furnace. Utility Model Patents CN02265196.9 and CN200620103234.X disclose a waste tire thermal cracking and reprocessing device.

[0006] 2) Use the ironmaking process to co-dispose of waste tires. For example, Chinese patent 201110262650.X proposes a method of spraying waste tire powder into the blast furnace as a flame retardant for blast furnace coal injection. Chinese patent 201020542209.8 discloses a new type of blast furnace injection gun, which can be used for spraying granular materials such as waste tires and waste rubber. The blast furnace injection of waste tires is mature, but it is restricted by two factors. First, the cost of waste tire acquisition and powder making is high, and there is no price advantage compared with coal; second, waste tires contain 2-3% ZnO, which will significantly increase the zinc load of the blast furnace, and the injection amount is usually no more than 5kg / tHM. These two factors greatly limit the co-disposal of waste tires in blast furnaces.

[0007] 3) Use microwaves to pyrolyze waste tires. For example, US patents US19900474066, US19900558706, US19920826126, and US19970853604 proposed methods for treating waste tires or organic solid wastes by microwave pyrolysis; Japanese patents JP19880503937, JP19880503937, and JP19880509244 proposed methods for mixing solid carbon with waste tires, waste plastics and other polymer wastes, and using microwave pyrolysis to obtain carbon-containing residues; Patent WO2004KR00207 discloses a method and device for using microwaves to deal with waste rubber or waste tires, which can recover carbon black and steel wire ropes from waste rubber or waste tires; Korean patents KR20070096486 and KR20070005019 introduce a method for using microwaves to pyrolyze waste tires, collect oil and gas and separate them, and classify and recover carbon black and pyrolysis oil. Chinese patents 201110009969.1, 201710832674.1, 200920189393.X, 201120014404.8, 201721183610.5, 201820896859.9 introduce various types of equipment or devices for treating waste tires based on microwave pyrolysis. Chinese patents 201811055721.7, 200710008844.0, 201710832060.3, 201710058079.7 introduce methods for recycling rubber, rubber powder, carbon black and activated carbon from waste tires based on microwave pyrolysis. In the Experimental Study on the Microwave Pyrolysis Process and Product Distribution Characteristics of Waste Tires by Yang Yaqing of Shandong University, a small microwave oven was used to study the changes in the gas / solid / oil three-phase ratio and products of microwave pyrolysis at different temperatures. Comparing the above patents and public documents, it can be seen that microwave pyrolysis has made significant progress in environmental protection and improving thermal efficiency compared with traditional pyrolysis, and is an important development direction for the utilization of waste tires. However, the products regenerated by this method have certain differences in performance from natural products, and there are great difficulties in the recycling and utilization of products. Therefore, its disposal scale has always been small and it is difficult to promote and apply on a large scale.

[0008] Thermochemical treatment technology (incineration, pyrolysis and gasification) of waste tires can be used to "resource, reduce and harmless" them, and it is simpler than the recycling method, so it is considered to be a more promising treatment method. Among the thermochemical treatment methods, microwave pyrolysis has become a hot topic of research due to its good controllability of the reaction, but the solid pyrolysis product contains iron / zinc, which affects the utilization value of carbon black; the oil and gas composition and separation equipment are complex, which affects the promotion and application of this process.

[0009] On the other hand, as steel mills limit coal consumption and reduce carbon emissions, the coking capacity of traditional integrated steel companies has shrunk, and the existing coke oven gas systems with complete oil and gas separation systems have surplus processing capacity. Summary of the invention

[0010] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method and system for the coordinated disposal of waste tires based on microwave pyrolysis and product steel process, which closely combines the microwave pyrolysis process of waste tires with the existing processes of the steel plant, and through coordinated disposal, the adverse effects of waste tires on the environment can be solved.

[0011] To achieve the above object, the present invention adopts the following technical solution:

[0012] The first aspect of the present invention provides a method for co-disposing waste tires based on microwave pyrolysis and product steel process, comprising the following steps:

[0013] S1, spinning the waste tires;

[0014] S2, crushing and magnetic separation are performed to obtain steel wire, other magnetic and non-magnetic materials;

[0015] S3, sending the steel wire and the other magnetic materials to a converter or an electric furnace;

[0016] S4, subjecting the non-magnetic material to microwave pyrolysis to obtain an oil-gas mixture and pyrolysis residue;

[0017] S5. Sending the oil-gas mixture to a coke oven gas system, and sending the pyrolysis residue to a rotary hearth furnace.

[0018] Preferably, the non-magnetic material is a mixture of rubber blocks and fibers, and the particle size is between 0 and 10 mm.

[0019] Preferably, the step S4 specifically includes the following steps:

[0020] S41, adding pyrolysis residue into the non-magnetic material;

[0021] S42, entering the material tank for nitrogen filling, and then entering the microwave pyrolysis device for pyrolysis to obtain an oil-gas mixture and pyrolysis residue.

[0022] Preferably, in the step S41, the proportion of the pyrolysis residue added is 3-10% of the non-magnetic material.

[0023] Preferably, in step S42, nitrogen is filled into the material tank to make the oxygen content in the material tank lower than 1%.

[0024] Preferably, in step S42, the temperature of the microwave pyrolysis device is controlled at 500-700°C, the pyrolysis time is 20-40 min, and the pressure is 10-15 kPa higher than the atmospheric pressure.

[0025] Preferably, the step S5 specifically includes the following steps:

[0026] S51, sending the oil-gas mixture to the coke oven gas system through a pipeline, and obtaining tar and pyrolysis gas after decomposition, which are used by the coke oven gas system;

[0027] S52, sending the pyrolysis residue to a cooling cylinder for cooling;

[0028] S53, further fine grinding is performed to obtain fine residue powder for use in the rotary hearth furnace.

[0029] Preferably, in the step S52, the temperature of the pyrolysis residue is cooled to below 80°C in the cooling cylinder.

[0030] Preferably, in step S53, the particle size of the residue fine powder is -0.074 mm, and the coverage rate needs to be above 80%.

[0031] Preferably, the step S53 is specifically as follows:

[0032] The residual fine powder is adjusted according to the carbon content of the dust in the rotary hearth furnace, with a ratio between 3% and 10%, ensuring that the total carbon content of the zinc dust in the rotary hearth furnace is maintained at 15%;

[0033] When the zinc in the residual fine powder is reduced, it is recycled in the form of zinc powder through the flue gas system, carbon acts as a reducing agent to react with metal oxides, and the sulfur in the residual fine powder combines with the metallic iron in the dust and enters the metal pellets in the rotary hearth furnace in the form of FeS.

[0034] The second aspect of the present invention provides a waste tire coordinated treatment system based on microwave pyrolysis and product steel process, comprising a waste tire room temperature treatment unit, and a microwave high temperature pyrolysis unit for non-magnetic matter in waste tires and a full product electric furnace-coke oven-rotary hearth furnace coordinated treatment unit respectively connected to the waste tire room temperature treatment unit;

[0035] The system for co-processing waste tires based on microwave pyrolysis and a steel product process realizes the method for co-processing waste tires based on microwave pyrolysis and a steel product process.

[0036] Preferably, the waste tire room temperature disposal unit comprises:

[0037] A spinning machine is used to spin the waste tires;

[0038] A crushing / magnetic separator is arranged at the rear of the wire drawing machine, and is used to crush and magnetically separate the waste tires after wire drawing to obtain steel wire, other magnetic materials and non-magnetic materials;

[0039] The forming machine is arranged after the crushing / magnetic separator and is used for forming the steel wire and other magnetic materials.

[0040] Preferably, the microwave high temperature pyrolysis unit for non-magnetic matter in waste tires comprises:

[0041] The microwave pyrolysis device is arranged after the crusher / magnetic separator and is used for performing microwave pyrolysis on the non-magnetic material to obtain an oil-gas mixture and pyrolysis residue.

[0042] Preferably, the all-product electric furnace-coke oven-rotary hearth furnace coordinated processing unit comprises:

[0043] A converter / electric furnace, which is arranged after the forming machine, and is used to use the formed steel wire and other magnetic materials;

[0044] A coke oven gas system, which is arranged after the microwave pyrolysis device and is used to use the oil-gas mixture;

[0045] The rotary hearth furnace is arranged after the microwave pyrolysis device and is used for utilizing the pyrolysis residue.

[0046] The method and system for co-disposing waste tires based on microwave pyrolysis and product steel process provided by the present invention also have the following beneficial effects:

[0047] 1) The hydrocarbons, carbon black, zinc and sulfur in waste tires can be recycled. Through microwave pyrolysis, the products are combined with the existing different processes of the joint steel plant. There is no need to add a complex pyrolysis oil and gas treatment system, which realizes the efficient utilization of solid waste resources and reduces environmental pollution. Moreover, the use method is reasonable and the amount is large, which can effectively solve the adverse effects of the increase in the amount of waste tires caused by the high development of transportation;

[0048] 2) With the development of low-carbon ironmaking technology, the traditional process will gradually shift to hydrogen-rich carbon circulation blast furnaces, and the consumption of solid coke will be reduced in the long term. In addition, the development of hydrogen metallurgy-electric furnace short process has also reduced the dependence of the steel process on coke. The output of the existing coking system will gradually decrease, and the coke oven gas system has the ability and potential to process the pyrolysis oil and gas of waste tires;

[0049] 3) Traditional waste tire recycling has potential risks to traffic safety due to quality fluctuations, and the local oil refining and pyrolysis processes have serious environmental hazards and complex processing systems. It is difficult to recover all the valuable substances in the waste tires. The present invention can better solve the problem of waste tire recycling through efficient coordination with different processes of steel mills;

[0050] 4) With the rapid development of the economy and society, the automobile industry will continue to maintain its growth momentum, and the generation of waste tires will increase year by year. At the same time, the steel industry is already in a stage of saturated production capacity, and subsequent carbon emissions will decrease year by year, and dependence on coke will gradually decrease. High-temperature furnaces such as coke ovens and rotary hearth furnaces have the ability to synergistically dispose of the pyrolysis products of waste tires. The present invention can organically combine the two industries, which is conducive to reducing the environmental pressure brought by waste tires, and can also effectively reduce the raw material cost of the steel process. It has environmental, economic and social benefits, and has good prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the process of the present invention for co-disposing waste tires based on microwave pyrolysis and product steel process;

[0052] Figure 2 It is a schematic diagram of the framework structure of the waste tire treatment system based on microwave pyrolysis and product steel process of the present invention. DETAILED DESCRIPTION

[0053] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0054] Combination Figure 1 As shown, the present invention also provides a method for co-disposing waste tires based on microwave pyrolysis and product steel process, comprising the following steps:

[0055] S1, spinning the waste tires;

[0056] S2, crushing and magnetic separation are performed to obtain steel wire, other magnetic and non-magnetic materials;

[0057] S3, sending steel wire and other magnetic materials to converter or electric furnace for use;

[0058] S4, subjecting the non-magnetic material to microwave pyrolysis to obtain an oil-gas mixture and pyrolysis residue;

[0059] S5. Send the oil-gas mixture to the coke oven gas system, and send the pyrolysis residue to the rotary hearth furnace.

[0060] The non-magnetic material is mainly composed of a mixture of rubber blocks and fibers, and the particle size is controlled between 0 and 10 mm.

[0061] The microwave pyrolysis process in step S4 specifically comprises the following steps:

[0062] S41, adding 3-10% of pyrolysis residue to the non-magnetic material, mixing and adding to the silo;

[0063] S42, entering the material tank for nitrogen filling and oxygen replacement to reduce the oxygen content to less than 1%, and then entering the microwave pyrolysis device for pyrolysis to obtain an oil-gas mixture and pyrolysis residue.

[0064] The pyrolysis temperature of the microwave pyrolysis device is controlled between 500 and 700°C, the pyrolysis time is between 20 and 40 minutes, and the pressure is 10 to 15 kPa higher than the atmospheric pressure, that is, slightly higher than the coke oven gas pressure by 2 to 3 kPa.

[0065] The oil-gas mixture transfer process in step S5 specifically includes the following steps:

[0066] S51, sending the oil and gas mixture produced by microwave pyrolysis to the coke oven gas system through a pipeline, and obtaining tar and pyrolysis gas after decomposition. Since the composition of the pyrolysis gas is similar to that of the coke oven gas, it can be directly used by the coke oven gas system;

[0067] S52, discharging the pyrolysis residue into a residue collection hopper through a spiral, and then discharging it into a cooling cylinder through a star-shaped discharge valve for cooling, and passing water outside the cooling cylinder for indirect cooling to cool the temperature of the pyrolysis residue to below 80° C.;

[0068] S53, the pyrolysis residue is finely ground to obtain residue fine powder, the particle size of which is -0.074mm and reaches more than 80%, which is used in the rotary hearth furnace.

[0069] The use of the pyrolysis residue in step S53 is specifically as follows:

[0070] The residual fine powder is adjusted according to the carbon content of the dust in the rotary hearth furnace, with a ratio between 3 and 10%, ensuring that the total carbon content of the zinc dust in the rotary hearth furnace is maintained at 15%;

[0071] When the zinc in the residual fine powder is reduced, it is recycled in the form of zinc powder through the flue gas system. Carbon acts as a reducing agent to react with metal oxides. The sulfur in the residual fine powder combines with the metallic iron in the dust and enters the metal pellets in the rotary hearth furnace in the form of FeS.

[0072] The present invention crushes and magnetically separates waste tires, packs zinc-containing steel wire ropes and other magnetic materials together with scrap steel and adds them to an electric furnace or a converter, wherein zinc volatilizes into dust and iron enters molten steel for recycling; after microwave pyrolysis of non-magnetic materials, the products enter a coke oven gas system and a rotary hearth furnace respectively and can be recycled. By using this method, the recovery of hydrocarbons, carbon black, iron, zinc and other elements in waste tires can be achieved, thereby avoiding the complex flue gas treatment problem caused by conventional waste tire pyrolysis processes and reducing environmental pollution.

[0073] Combination Figure 2As shown, the present invention also provides a waste tire coordinated treatment system based on microwave pyrolysis and product steel process, including a waste tire room temperature treatment unit 1 and a microwave high temperature pyrolysis unit 2 for non-magnetic matter in waste tires, and a full product electric furnace-coke oven-rotary hearth furnace coordinated treatment unit 3 respectively connected to the waste tire room temperature treatment unit 1.

[0074] The method for co-processing waste tires based on microwave pyrolysis and a product steel process is realized by the system for co-processing waste tires based on microwave pyrolysis and a product steel process.

[0075] Waste tire room temperature disposal unit 1 includes:

[0076] A spinning machine 11, used for spinning waste tires;

[0077] The crushing / magnetic separator 12 is arranged at the rear of the wire drawing machine 11, and is used to crush and magnetically separate the waste tires after wire drawing to obtain steel wires, other magnetic materials and non-magnetic materials;

[0078] The molding machine 13 is arranged after the crushing / magnetic separator 12 and is used for pressing and molding steel wires and other magnetic materials.

[0079] The microwave high temperature pyrolysis unit 2 for non-magnetic matter in waste tires includes:

[0080] The microwave pyrolysis device 21 is arranged after the crusher / magnetic separator 12 and is used for performing microwave pyrolysis on non-magnetic materials to obtain an oil-gas mixture and pyrolysis residue.

[0081] The full product electric furnace-coke oven-rotary hearth furnace coordinated processing unit 3 includes:

[0082] The converter / electric furnace 31 is provided after the forming machine 13 and is used to use the steel wire and other magnetic materials after being pressed and formed;

[0083] The coke oven gas system 32 is provided at the rear of the microwave pyrolysis device 21 and is used to use the oil-gas mixture;

[0084] The rotary hearth furnace 33 is disposed after the microwave pyrolysis device 21 and is used to utilize the pyrolysis residue.

[0085] Through the waste tire coordinated treatment system based on microwave pyrolysis and product steel process, 100% resource utilization of waste tires can be achieved.

[0086] Example 1

[0087] The weight of waste tires is 100%. After drawing, 8% of steel cords are removed. 92% of the mass of waste tires are crushed and magnetically separated. The crushing is to a particle size of -5mm. 3% of fine steel wires are removed by magnetic separation. After the steel cords and fine steel wires are packed, they are transported to the converter to replace part of the scrap steel and melted at high temperature to form molten steel. The remaining 89% of non-magnetic particles, mainly rubber particles and fibers, are mixed with 5% of pyrolysis residues to improve the wave absorption performance of the mixture and increase the heating rate. A mixture equivalent to 94% of the total weight of waste tires is added to the silo, and nitrogen is passed to replace the air to make the oxygen content less than 1%. Then, the mixture is added to the microwave pyrolysis device, and the pyrolysis temperature is controlled at 500℃ for 40 minutes. The pyrolysis oil and gas yield is 51%, and the oil and gas ratios are 42% and 9% respectively; the pyrolysis residue yield is 43%. The industrial analysis results of the pyrolysis residue are 0.1% moisture, 15.2% ash, 1.1% volatile matter, and 83.6% fixed carbon. The elemental analysis results are 81.1% carbon, 2.1% zinc, and 3.0% sulfur. After fine grinding of the pyrolysis residue, the proportion of -0.074mm is 81%, and it is added to the rotary hearth furnace mixture at 6% of the total weight. After briquetting, drying, high-temperature reduction, and cooling, the main components of the rotary hearth furnace metal pellets are as follows: TFe 68.1%, MFe54.8%, Zn0.35%, S0.75%, and compressive strength 1120N / piece.

[0088] Example 2

[0089] The weight of waste tires is 100%. After drawing, 6% of steel cords are removed. 94% of the mass of waste tires are crushed and magnetically separated to a particle size of -5mm. 6% of fine steel wires are removed by magnetic separation. After the steel cords and fine steel wires are packed, they are transported to the converter to replace part of the scrap steel and melted at high temperature to form molten steel. The remaining 88% of non-magnetic particles, mainly rubber particles and fibers, are mixed with 9% of pyrolysis residues to improve the wave absorption performance of the mixture and increase the heating rate. A mixture equivalent to 97% of the total weight of waste tires is added to the silo, and nitrogen is passed to replace the air to make the oxygen content less than 1%. Then, the mixture is added to the microwave pyrolysis device, and the pyrolysis temperature is controlled at 600℃ for 30 minutes. The pyrolysis oil and gas yield is 60%, and the oil and gas ratios are 39% and 21% respectively; the pyrolysis residue yield is 37%. The industrial analysis results of the pyrolysis residue are 0.1% moisture, 14.5% ash, 0.8% volatile matter, and 84.6% fixed carbon. The elemental analysis results are 82.3% carbon, 2.3% zinc, and 2.8% sulfur. After fine grinding of the pyrolysis residue, the proportion of -0.074mm is 83%, and it is added to the rotary hearth furnace mixture at a rate of 10% of the total weight. After briquetting, drying, high-temperature reduction, and cooling, the main components of the rotary hearth furnace metal pellets are as follows: TFe 67.4%, MFe 51.4%, Zn 0.38%, S 0.80%, and the compressive strength is 1330N / piece.

[0090] Example 3

[0091] The weight of waste tires is 100%. After drawing, 7% of steel cords are removed. 93% of the mass of waste tires are crushed and magnetically separated. The crushing is to a particle size of -5mm. 3% of fine steel wires are removed by magnetic separation. After the steel cords and fine steel wires are packed, they are transported to the electric furnace to replace part of the scrap steel. The remaining 90% of non-magnetic particles, mainly rubber particles and fibers, are mixed with 8% of pyrolysis residues. A mixture equivalent to 98% of the total weight of waste tires is added to the silo. After nitrogen is passed to replace the air and the oxygen content is lower than 1%, the mixture is added to the microwave pyrolysis device. The pyrolysis temperature is controlled at 700℃ and the time is 20min. The pyrolysis oil and gas yield is 63%, and the oil and gas ratios are 38% and 25% respectively; the pyrolysis residue yield is 35%. The industrial analysis results of the pyrolysis residue are 0.1% moisture, 14.2% ash, 0.4% volatile matter, and 85.3% fixed carbon. The elemental analysis results are 83.2% carbon, 1.7% zinc, and 2.4% sulfur. After fine grinding of the pyrolysis residue, the proportion of -0.074mm is 85%, and it is added to the rotary hearth furnace mixture at 5% of the total weight. After briquetting, drying, high-temperature reduction and cooling, the main components of the rotary hearth furnace metal pellets are as follows: TFe 67.4%, MFe 51.4%, Zn 0.37%, S 0.68%, and compressive strength 1405N / piece.

[0092] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for co-processing waste tires based on microwave pyrolysis and product steel process, characterized in that: The following steps are involved: S1, spinning the waste tires; S2, crushing and magnetic separation are performed to obtain steel wire, other magnetic and non-magnetic materials; S3, sending the steel wire and the other magnetic materials to a converter or an electric furnace; S4, subjecting the non-magnetic material to microwave pyrolysis to obtain an oil-gas mixture and pyrolysis residue; S5. Sending the oil-gas mixture to a coke oven gas system, and sending the pyrolysis residue to a rotary hearth furnace.

2. The method for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 1 is characterized in that: The non-magnetic material is a mixture of rubber blocks and fibers, and the particle size is between 0 and 10 mm.

3. The method for co-processing waste tires based on microwave pyrolysis and product steel process according to claim 1 is characterized in that: The step S4 specifically comprises the following steps: S41, adding pyrolysis residue into the non-magnetic material; S42, entering the material tank for nitrogen filling, and then entering the microwave pyrolysis device for pyrolysis to obtain an oil-gas mixture and pyrolysis residue.

4. The method for co-disposal of waste tires based on microwave pyrolysis and product steel flow according to claim 3 is characterized in that: In the step S41, the proportion of the pyrolysis residue added is 3-10% of the non-magnetic material.

5. The method for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 3 is characterized in that: In the step S42, nitrogen is filled into the material tank to make the oxygen content in the material tank lower than 1%.

6. The method for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 3 is characterized by: In the step S42, the temperature of the microwave pyrolysis device is controlled at 500-700°C, the pyrolysis time is 20-40 minutes, and the pressure is 10-15 kPa higher than the atmospheric pressure.

7. The method for co-disposal of waste tires based on microwave pyrolysis and product steel flow according to claim 3 is characterized by: The step S5 specifically comprises the following steps: S51, sending the oil-gas mixture to the coke oven gas system through a pipeline, and obtaining tar and pyrolysis gas after decomposition, which are used by the coke oven gas system; S52, sending the pyrolysis residue to a cooling cylinder for cooling; S53, further fine grinding is performed to obtain fine residue powder for use in the rotary hearth furnace.

8. The method for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 7 is characterized in that: In the step S52, the temperature of the pyrolysis residue is cooled to below 80°C in the cooling cylinder.

9. The method for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 7, characterized in that: In the step S53, the particle size of the residue fine powder is -0.074 mm, and the coverage rate needs to be above 80%.

10. The method for co-processing waste tires based on microwave pyrolysis and product steel process according to claim 7, characterized in that: The step S53 is specifically as follows: The residual fine powder is adjusted according to the carbon content of the dust in the rotary hearth furnace, with a ratio between 3% and 10%, ensuring that the total carbon content of the zinc dust in the rotary hearth furnace is maintained at 15%; When the zinc in the residual fine powder is reduced, it is recycled in the form of zinc powder through the flue gas system, carbon acts as a reducing agent to react with metal oxides, and the sulfur in the residual fine powder combines with the metallic iron in the dust and enters the metal pellets in the rotary hearth furnace in the form of FeS.

11. A system for co-processing waste tires based on microwave pyrolysis and product steel process, characterized in that: It comprises a waste tire room temperature treatment unit, and a microwave high temperature pyrolysis unit for non-magnetic matter in waste tires and a full product electric furnace-coke oven-rotary hearth furnace coordinated treatment unit respectively connected to the waste tire room temperature treatment unit; The system for co-processing waste tires based on microwave pyrolysis and a product steel process realizes the method for co-processing waste tires based on microwave pyrolysis and a product steel process as described in any one of claims 1-10.

12. The system for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 11, characterized in that: The waste tire room temperature disposal unit comprises: A wire drawing machine is used to draw wire from waste tires; A crushing / magnetic separator is arranged at the rear of the wire drawing machine, and is used to crush and magnetically separate the waste tires after wire drawing to obtain steel wire, other magnetic materials and non-magnetic materials; The forming machine is arranged after the crushing / magnetic separator and is used for forming the steel wire and other magnetic materials.

13. The system for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 12, characterized in that: The microwave high temperature pyrolysis unit for non-magnetic matter in waste tires comprises: The microwave pyrolysis device is arranged after the crusher / magnetic separator and is used for performing microwave pyrolysis on the non-magnetic material to obtain an oil-gas mixture and pyrolysis residue.

14. The system for co-processing waste tires based on microwave pyrolysis and product steel flow according to claim 13, characterized in that: The full-product electric furnace-coke oven-rotary hearth furnace coordinated processing unit comprises: A converter / electric furnace, which is arranged after the forming machine, and is used to use the formed steel wire and other magnetic materials; A coke oven gas system, which is arranged after the microwave pyrolysis device and is used to use the oil-gas mixture; The rotary hearth furnace is arranged after the microwave pyrolysis device and is used for utilizing the pyrolysis residue.

Images