A method and system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction

Abstract

This invention belongs to the field of resource recycling technology and relates to a method and system for coupled pyrolysis reforming of organic solid waste with iron ore powder reduction. The method involves heating and pyrolyzing the organic solid waste with high-temperature reducing gas to obtain pyrolysis gas, pyrolysis oil, and pyrolysis char; then, using high-temperature steam to gasify and reform the pyrolysis oil and a portion of the pyrolysis char to obtain high-temperature reducing gas for pyrolysis; finally, mixing the remaining pyrolysis char with iron ore powder and adding the pyrolysis gas to conduct a redox reaction, thereby reducing the iron ore powder to obtain sponge iron. This invention not only treats organic solid waste but also utilizes it to produce coke and hydrogen-rich reducing gas. Simultaneously, the generated hydrogen-rich reducing gas and coke act as reducing agents to directly reduce iron ore powder, saving on the amount of reducing agent used in the direct reduction of iron ore powder and yielding high-grade sponge iron.

Description

Technical Field

[0001] The invention belongs to the technical field of resource recycling and relates to a method and system for coupling pyrolysis and reforming of organic solid waste with iron ore powder reduction. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Solid waste contains a variety of toxic substances such as heavy metals and organic pollutants. It not only occupies a large amount of land, but also directly or indirectly threatens human health through environmental media such as the atmosphere, soil, and water. However, the organic matter content in the waste is high, and effectively recycling it for energy utilization is the core means to solve environmental problems. Organic solid waste will be decomposed into gas, liquid, and solid products after pyrolysis treatment. The pyrolysis process conditions and the properties of the raw materials directly affect the properties and production efficiency of the products. If only a single pyrolysis reaction is used, the H2 production in the pyrolysis gas is low, and tar with high viscosity is formed after pyrolysis, which increases the risk of local blockage of the pipeline and is not conducive to the normal thermochemical reaction activities.

[0004] At the same time, the proportion of non-metallic materials and non-ferrous metals used in steel has increased in recent years, resulting in a continuous decline in the quality of scrap steel, which has caused great difficulties in the steelmaking process. If sponge iron (direct reduced iron) is used as a diluent with scrap steel, it can not only increase the uniformity of the steel, but also improve and enhance the physical properties of the steel, thereby achieving the purpose of producing high-quality steel. However, the preparation of sponge iron using iron ore powder as raw material requires a large amount of reducing agent, and the iron ore powder is melt-bonded, making it difficult to obtain high-grade sponge iron. Summary of the invention

[0005] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a method and system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, which can not only treat organic solid waste, but also utilize it as a resource to produce coke and hydrogen-rich reducing gas. At the same time, the generated hydrogen-rich reducing gas and coke are used as reducing agents to directly reduce iron ore powder, which not only saves the amount of reducing agent used for direct reduction of iron ore powder, but also can obtain high-grade sponge iron.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] On the one hand, a method for coupling pyrolysis and reforming of organic solid waste with reduction of iron ore powder is provided, wherein high-temperature reducing gas is used to heat and pyrolyze organic solid waste to obtain pyrolysis gas, pyrolysis oil and pyrolysis char; high-temperature water vapor is used to gasify and reform the pyrolysis oil and a portion of the pyrolysis char to obtain high-temperature reducing gas for pyrolysis; another portion of the pyrolysis char is mixed with iron ore powder, and pyrolysis gas is added to carry out an oxidation-reduction reaction, so that the iron ore powder is reduced to obtain sponge iron, wherein the temperature of the high-temperature reducing gas is 350 to 1200°C, and the temperature of the high-temperature water vapor is 600 to 1200°C.

[0008] The present invention utilizes high-temperature reducing gas at 350-1200°C to directly pyrolyze organic solid waste to produce pyrolysis oil, pyrolysis carbon and pyrolysis gas, and utilizes high-temperature water vapor at 600-1200°C to react pyrolysis oil and a portion of pyrolysis carbon to produce high-reduction potential hydrogen-rich reducing gas. At this time, the reducing gas temperature is relatively high, which can reach 350-1200°C, and can directly heat and pyrolyze organic solid waste. The pyrolysis gas generated after pyrolysis not only contains the original high-reduction potential hydrogen-rich reducing gas, but also contains high-temperature water vapor in the reducing gas, and can further reform the pyrolysis gas generated during the pyrolysis process, reduce the CO2 content in the pyrolysis gas, and increase the H2 content, thereby further increasing the reducing potential of the hydrogen-rich reducing gas. When iron ore powder is mixed and heated with pyrolysis carbon and hydrogen-rich reducing gas, the iron ore powder will generate direct reduced iron under the action of reducing substances. At the same time, the pyrolysis carbon can prevent the iron ore powder from high-temperature melting and bonding with the iron ore powder, thereby obtaining high-grade direct reduced iron.

[0009] In another aspect, a system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction comprises:

[0010] A pyrolysis furnace, used to pyrolyze organic solid waste to produce pyrolysis oil, pyrolysis charcoal and pyrolysis gas;

[0011] A washing tower is used to separate the pyrolysis gas carrying pyrolysis oil after pyrolysis into gas and liquid;

[0012] The reforming furnace is used to gasify and reform the pyrolysis oil from the scrubber and the pyrolysis char from the pyrolysis furnace using high-temperature steam at 600 to 1200°C to generate high-temperature reducing gas at a temperature of 350 to 1200°C, and the high-temperature reducing gas at 350 to 1200°C is transported to the pyrolysis furnace for heating and pyrolysis;

[0013] The reduction furnace is used to reduce the iron ore powder by the pyrolysis carbon from the pyrolysis furnace and the pyrolysis gas from the washing tower to produce sponge iron.

[0014] The present invention is directed to the pyrolysis of organic solid waste at high temperature, which can produce pyrolysis carbon, pyrolysis oil and pyrolysis gas; high-temperature water vapor can gasify and reform the pyrolysis carbon and pyrolysis oil to prepare hydrogen-rich synthesis gas; iron ore powder can be reduced to prepare direct reduced iron under the synergistic effect of pyrolysis carbon and reducing gas. By using a pyrolysis tower, a desulfurization tower, a desorption tower, a steam heating device, etc., and by controlling various reaction conditions, the pyrolysis of organic solid waste is combined with the direct reduction of iron ore powder to produce direct reduced iron and hydrogen-rich synthesis gas.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention uses pyrolytic carbon powder to reduce iron ore powder. The reduction and gasification catalyze each other, which can not only prevent the iron ore powder from melting and bonding at high temperature, but also slow down the reduction of reduction potential, thereby improving the quality and yield of direct reduced iron.

[0017] 2. In the present invention, the high-temperature steam reforming to prepare hydrogen-rich synthesis gas and the iron ore powder reduction process are carried out separately, which can prevent the inhibitory effect of steam on the reduction of iron ore powder and is beneficial to improving the direct reduction iron yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 This is a schematic structural diagram of a system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction according to Example 2 of the present invention;

[0020] Figure 2 This is a schematic structural diagram of a system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction according to Example 3 of the present invention;

[0021] Figure 3 This is a schematic structural diagram of a system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction according to Example 4 of the present invention;

[0022] Among them, 1. pyrolysis furnace, 2. washing tower, 3. reforming furnace, 4. reduction furnace, 5. flash tower, 6. steam heating device, 7. solid waste dryer, 8. crusher. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] In view of the low H2 production from existing organic solid waste pyrolysis, the fact that the preparation of sponge iron requires a large amount of reducing agent and it is difficult to obtain high-grade sponge iron, the present invention proposes a method and system for coupling pyrolysis and reforming of organic solid waste with iron ore powder reduction.

[0026] A typical embodiment of the present invention provides a method for coupling pyrolysis and reforming of organic solid waste with reduction of iron ore powder, wherein high-temperature reducing gas is used to heat and pyrolyze organic solid waste to obtain pyrolysis gas, pyrolysis oil and pyrolysis char; high-temperature water vapor is used to gasify and reform the pyrolysis oil and a portion of the pyrolysis char to obtain high-temperature reducing gas for pyrolysis; another portion of the pyrolysis char is mixed with iron ore powder, and pyrolysis gas is added to carry out an oxidation-reduction reaction, so that the iron ore powder is reduced to obtain sponge iron, wherein the temperature of the high-temperature reducing gas is 350 to 1200°C, and the temperature of the high-temperature water vapor is 600 to 1200°C.

[0027] Since the temperature after pyrolysis is relatively high, the pyrolysis oil becomes gaseous and is carried by the pyrolysis gas to be discharged as a gas-phase material. In some embodiments, the gas-phase material after pyrolysis is washed and the oil and water are separated to obtain pyrolysis gas, pyrolysis oil and wastewater.

[0028] In one or more embodiments, low-temperature steam is obtained after flash evaporation of wastewater, and the low-temperature steam is heated to generate high-temperature steam for gasification reforming. This method realizes the recycling of process steam and greatly reduces water consumption. At the same time, combined with slurry flash evaporation technology, flash evaporation requires heat, and the heat comes from high-temperature synthesis gas, so the waste heat (sensible heat and latent heat) of synthesis gas can be recycled at a very low cost, reducing the system process energy consumption. Moreover, during the flash evaporation process, the temperature of the high-temperature synthesis gas drops, and the water vapor in the synthesis gas condenses, thereby realizing the dehydration of the synthesis gas.

[0029] In one or more embodiments, the dry pyrolysis gas after oil-water separation is heated and then subjected to a redox reaction.

[0030] In one or more embodiments, the gas after the redox reaction is used for pyrolysis. The water content in the gas after the redox reaction increases and the reduction potential decreases. After being mixed with the pyrolysis gas, it returns to the pyrolysis furnace as a heat medium for pyrolysis of organic solid waste.

[0031] In some embodiments, the temperature of the redox reaction is 700-1000°C.

[0032] The reducing gas and pyrolysis gas described in the present invention are both hydrogen-rich synthesis gas, and the main components of the hydrogen-rich synthesis gas described in the present invention are N2, CO, H2, CH4, C2H6, C3H8, CO2, etc.

[0033] The organic solid waste described in the present invention includes municipal solid waste, biogas residue, sludge, coal or waste carbon materials, and waste generated during the processing and production of textiles, leather, paper products, rubber and plastics.

[0034] Another embodiment of the present invention provides a system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, comprising:

[0035] A pyrolysis furnace, used to pyrolyze organic solid waste to produce pyrolysis oil, pyrolysis charcoal and pyrolysis gas;

[0036] A washing tower is used to separate the pyrolysis gas carrying pyrolysis oil after pyrolysis into gas and liquid;

[0037] The reforming furnace is used to gasify and reform the pyrolysis oil from the scrubber and the pyrolysis char from the pyrolysis furnace using high-temperature steam at 600 to 1200°C to generate high-temperature reducing gas at a temperature of 350 to 1200°C, and the high-temperature reducing gas at 350 to 1200°C is transported to the pyrolysis furnace for heating and pyrolysis;

[0038] The reduction furnace is used to reduce the iron ore powder by the pyrolysis carbon from the pyrolysis furnace and the pyrolysis gas from the washing tower to produce sponge iron.

[0039] The pyrolysis furnace of the present invention can be of various types such as an entrained bed, a fluidized bed, a boiling bed, a bubbling bed, a spouted bed, a settling bed, a rotary kiln, a moving bed, a fixed bed, etc.

[0040] The reforming furnace described in the present invention can be of various bed types such as an entrained bed, a fluidized bed, a boiling bed, a bubbling bed, a spouted bed, a settling bed, a rotary kiln, a moving bed, a fixed bed, etc.

[0041] The reduction furnace of the present invention can be of various bed types such as an entrained bed, a fluidized bed, a boiling bed, a bubbling bed, a spouted bed, a settling bed, a rotary kiln, a moving bed, a fixed bed, etc.

[0042] In some embodiments, a flash tower and a steam heating device are included, which are used to flash the water discharged from the washing tower to generate low-temperature steam, and the steam heating device heats the low-temperature steam to high-temperature steam of 600 to 1200°C, and transports the heated high-temperature steam to the pyrolysis furnace. The steam heating device can be a heater in various forms such as a heat storage heating furnace and a silicon carbide high-temperature heat exchanger.

[0043] In one or more embodiments, the dried pyrolysis gas is heated by a steam heating device and then enters the reduction furnace.

[0044] In some embodiments, the gas phase outlet of the reduction furnace is connected to the gas phase inlet of the pyrolysis furnace.

[0045] In some embodiments, a dryer and a crusher are sequentially arranged at the organic solid waste inlet of the pyrolysis furnace according to the material flow direction, so as to dry and crush the organic solid waste and achieve better pyrolysis.

[0046] The solid-phase material is provided with conveying power by a feeder, and the feeder can be a variety of feeding forms such as a screw feeder and an air lock feeder.

[0047] The gas conveying process is powered by an induced draft fan or a forced draft fan.

[0048] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

[0049] Example 1

[0050] A method for pyrolysis reforming of organic solid waste coupled with iron ore powder reduction, wherein the powdered organic solid waste is heated in a pyrolysis furnace by circulating high-temperature reducing gas at 350 to 1200°C, and pyrolysis occurs within a temperature range of 350 to 1200°C to generate pyrolysis gas, pyrolysis carbon powder and pyrolysis oil. A portion of the pyrolysis carbon powder and the pyrolysis oil are sent to the reforming furnace together with the pyrolysis oil to react with high-temperature water vapor at 600 to 1200°C to generate hydrogen-rich reducing gas with high reduction potential. The temperature of the hydrogen-rich reducing gas generated at this time is 350 to 1200°C, which is the above-mentioned circulating high-temperature reducing gas at 350 to 1200°C. The pyrolysis gas generated by pyrolysis is heated to 700 to 1100°C and then passed into the iron ore powder reduction furnace, where it reacts with another portion of pyrolysis carbon powder and iron ore powder within a temperature range of 700 to 1000°C to prepare sponge iron, i.e., direct reduced iron.

[0051] Example 2

[0052] A system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, such as Figure 1 As shown, it includes a pyrolysis furnace 1, a washing tower 2, a reforming furnace 3, and a reducing furnace 4. The outlet of the pyrolysis furnace 1 is connected to the washing tower 2, and the oil phase outlet of the washing tower 2 is connected to the inlet of the reforming furnace 3. The gas phase outlet of the washing tower 2 is connected to the inlet of the reducing furnace 4. The solid phase outlet of the pyrolysis furnace 1 is connected to the inlet of the reforming furnace 3 and the inlet of the reducing furnace 4.

[0053] The process is as follows: the powdered organic solid waste is heated in the pyrolysis furnace by the 350-1200℃ high-temperature reducing gas that is circulated back, and pyrolysis occurs in the temperature range of 350-1200℃, generating pyrolysis gas, pyrolysis carbon powder and pyrolysis oil. The pyrolysis gas and the pyrolysis oil that is mixed and gasified after the pyrolysis enter the washing tower together, and the mixed gas is dehydrated and deoiled by spraying in the washing tower. The cooled pyrolysis oil is discharged from the washing tower through the oil-water separation device and then sent to the reforming furnace. A part of the pyrolysis carbon powder is sent to the reforming furnace together with the pyrolysis oil to react with the high-temperature water vapor of 600-1200℃ to generate hydrogen-rich reducing gas with high reduction potential. The temperature of the hydrogen-rich reducing gas generated at this time is 350-1200℃, which is the 350-1200℃ high-temperature reducing gas that is circulated back as mentioned above. The pyrolysis gas generated by pyrolysis is heated to 700-1100°C and then passed into the iron ore powder reduction furnace to react with another part of pyrolysis carbon powder and iron ore powder in the temperature range of 700-1000°C to prepare sponge iron, namely direct reduced iron.

[0054] Example 3

[0055] A system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, such as Figure 2 As shown, it includes a pyrolysis furnace 1, a washing tower 2, a reforming furnace 3, a reducing furnace 4, a flash tower 5 and a steam heating device 6. The outlet of the pyrolysis furnace 1 is connected to the washing tower 2, and the oil phase outlet of the washing tower 2 is connected to the inlet of the reforming furnace 3. The gas phase outlet of the washing tower 2 is connected to the inlet of the reducing furnace 4. The liquid phase outlet of the washing tower 2 is connected to the flash tower 5 and the steam heating device 6 in sequence. The high-temperature water vapor outlet of the steam heating device 6 is connected to the reforming furnace 3. The solid phase outlet of the pyrolysis furnace 1 is connected to the inlet of the reforming furnace 3 and the inlet of the reducing furnace 4.

[0056] The process is as follows: the powdered organic solid waste is heated in the pyrolysis furnace by the circulating high-temperature reducing gas of 350-1200℃, and pyrolysis occurs in the temperature range of 350-1200℃, generating pyrolysis gas, pyrolysis carbon powder and pyrolysis oil. The pyrolysis gas and the pyrolysis oil mixed with the reducing gas after pyrolysis enter the scrubber together, and the mixed gas is dehydrated and deoiled by spraying in the scrubber. The cooled pyrolysis oil is discharged from the scrubber through the oil-water separation device and then sent to the reformer. The wastewater after oil-water separation is sent to the flash tower to obtain clean low-temperature water vapor. This process realizes the migration of sensible heat and latent heat of the high-temperature mixed gas. The low-temperature water vapor is indirectly heated to 600-1200℃ by the steam heating device and then passed into the reformer. A part of the pyrolysis carbon powder is sent to the reformer together with the pyrolysis oil to react with the high-temperature water vapor of 600-1200℃ to generate hydrogen-rich reducing gas with high reduction potential. The temperature of the hydrogen-rich reducing gas generated at this time is 350-1200°C, which is the 350-1200°C high-temperature reducing gas recycled above. The pyrolysis gas generated by pyrolysis is heated to 700-1100°C and then introduced into the iron ore powder reduction furnace to react with another part of the pyrolysis carbon powder and iron ore powder in the temperature range of 700-1000°C to prepare sponge iron, i.e. direct reduced iron.

[0057] Example 4

[0058] A system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, such as Figure 3 As shown, it includes a pyrolysis furnace 1, a washing tower 2, a reforming furnace 3, a reduction furnace 4, a flash tower 5, a steam heating device 6, a solid waste dryer 7, and a crusher 8. The organic solid waste inlet of the pyrolysis furnace 1 is sequentially provided with a solid waste dryer 7 and a crusher 8 according to the material flow direction. The outlet of the pyrolysis furnace 1 is connected to the washing tower 2, and the oil phase outlet of the washing tower 2 is connected to the inlet of the reforming furnace 3. The gas phase outlet of the washing tower 2 is connected to the inlet of the reduction furnace 4. The liquid phase outlet of the washing tower 2 is sequentially connected to the flash tower 5 and the steam heating device 6. The high-temperature water vapor outlet of the steam heating device 6 is connected to the reforming furnace 3. The gas phase outlet of the washing tower 2 is connected to the steam heating device 6. The pyrolysis gas outlet of the steam heating device 6 is connected to the inlet of the reduction furnace 4. The solid phase outlet of the pyrolysis furnace 1 is connected to the inlet of the reforming furnace 3 and the inlet of the reduction furnace 4. The gas phase outlet of the reduction furnace 4 is connected to the inlet of the pyrolysis furnace 1. The steam heating device 6 is provided with a steam inlet and a pyrolysis gas inlet, and the outlet of the flash tower 5 is connected to the water vapor inlet of the steam heating device 6; the gas phase outlet of the washing tower 2 is connected to the pyrolysis gas inlet of the steam heating device 6; the water vapor inlet in the steam heating device 6 is connected to the water vapor passage, and the pyrolysis gas inlet is connected to the pyrolysis gas passage, and the water vapor passage and the pyrolysis gas passage are independently provided.

[0059] The process is as follows: the powdered organic solid waste is heated in the pyrolysis furnace by the circulating high-temperature reducing gas of 350-1200℃, and pyrolysis occurs in the temperature range of 350-1200℃, generating pyrolysis gas, pyrolysis carbon powder and pyrolysis oil. The pyrolysis gas and the pyrolysis oil mixed with the reducing gas after pyrolysis enter the scrubber together, and the mixed gas is dehydrated and deoiled by spraying in the scrubber. The cooled pyrolysis oil is discharged from the scrubber through the oil-water separation device and then sent to the reformer. The wastewater after oil-water separation is sent to the flash tower to obtain clean low-temperature water vapor. This process realizes the migration of sensible heat and latent heat of the high-temperature mixed gas. The low-temperature water vapor is indirectly heated to 600-1200℃ by the steam heating device and then passed into the reformer. A part of the pyrolysis carbon powder is sent to the reformer together with the pyrolysis oil to react with the high-temperature water vapor of 600-1200℃ to generate hydrogen-rich reducing gas with high reduction potential. The temperature of the hydrogen-rich reducing gas generated at this time is 350-1200°C, which is the 350-1200°C high-temperature reducing gas circulated back as mentioned above. The clean and dry reducing gas discharged from the scrubber is indirectly heated to 700-1100°C by a steam heating device and then passed into the reduction furnace to react with another part of the pyrolysis carbon powder and iron ore powder in the temperature range of 700-1000°C to prepare sponge iron, i.e. direct reduced iron. The water content in the reducing gas discharged from the reduction furnace increases and the reduction potential decreases. After mixing with the high-reduction-potential hydrogen-rich synthesis gas discharged from the reforming furnace, it returns to the pyrolysis furnace as a heat medium for the pyrolysis of organic solid waste.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, characterized in that: The organic solid waste is heated and pyrolyzed by high-temperature reducing gas to obtain pyrolysis gas, pyrolysis oil and pyrolysis charcoal; the pyrolysis oil and a part of the pyrolysis charcoal are gasified and reformed by high-temperature steam to obtain high-temperature reducing gas for pyrolysis; the other part of the pyrolysis charcoal is mixed with iron ore powder, and the pyrolysis gas is added to perform oxidation-reduction reaction, so that the iron ore powder is reduced to obtain sponge iron, wherein the temperature of the high-temperature reducing gas is 350-1200°C, and the temperature of the high-temperature steam is 600-1200°C; Washing the gas phase material after pyrolysis and separating oil from water to obtain pyrolysis gas, pyrolysis oil and waste water; After flash evaporation of wastewater, low-temperature steam is obtained, and the low-temperature steam is heated to generate high-temperature steam for gasification reforming; The dry pyrolysis gas after oil-water separation is cooled and then subjected to redox reaction.

2. The method for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction according to claim 1, characterized in that: The gas after the redox reaction is used for pyrolysis.

3. The method for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction according to claim 1, characterized in that: The temperature of the redox reaction is 700~1000 ℃.

4. A system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction, characterized in that it comprises: A pyrolysis furnace, used to pyrolyze organic solid waste to produce pyrolysis oil, pyrolysis charcoal and pyrolysis gas; A washing tower is used to separate the pyrolysis gas carrying pyrolysis oil after pyrolysis into gas and liquid; The reforming furnace is used to gasify and reform the pyrolysis oil from the scrubber and the pyrolysis char from the pyrolysis furnace using high-temperature steam at 600-1200°C to generate high-temperature reducing gas at 350-1200°C, and the high-temperature reducing gas at 350-1200°C is transported to the pyrolysis furnace for heating and pyrolysis; A reduction furnace, used for reducing iron ore powder by using pyrolysis carbon from the pyrolysis furnace and pyrolysis gas from the scrubber to produce sponge iron; It includes a flash tower and a steam heating device, which are used to flash the water discharged from the washing tower to generate low-temperature steam. The steam heating device heats the low-temperature steam to high-temperature steam of 600-1200°C, and transports the heated high-temperature steam to the pyrolysis furnace; The dry pyrolysis gas is cooled by a steam heating device and then enters the reduction furnace.

5. The system for pyrolysis and reforming of organic solid waste coupled with iron ore powder reduction as claimed in claim 4, characterized in that: The gas phase outlet of the reduction furnace is connected to the gas phase inlet of the pyrolysis furnace.

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