Solar high-multiple light supply heat Fe3O4 reduced iron powder fuel production system

Abstract

A solar high-multiple light condensation heat supply Fe3O4 reduced iron powder fuel production system, including the supply device of the carbon powder and Fe3O4 powder raw material that has been stirred fully, the reaction device of the high-density sunlight energy of the absorption solar light condenser collection and the high-temperature chemical reaction of fine particle or powder raw material, the cooling device of the output reaction product of receiving reaction device and carries out cooling, the sorting device of the product of receiving cooling device in cooling and carries out sorting, the gas collection device for collecting gas product in reaction device and cooling device;The outer fixed cylinder and rotating cylinder of light transmission in reaction device form annular cavity, and the spiral boss on the surface of rotating cylinder in annular cavity carries out controllable speed transport to reaction raw material, maximizes absorption light energy and completes reduction reaction;The reduced product after cooling adopts magnetic separation with magnetic medium and non-magnetic carbon powder, and the application has the advantages of high-efficiency heat absorption of reactant, controllable transport, full recycling of solar heat energy and the like, and can realize efficient reaction and simple structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of solar energy concentration heat utilization and the field of solar high-temperature thermochemical energy storage, in particular to a Fe3O4 reduced iron powder fuel production system with solar high-multiple light supply heat. BACKGROUND

[0002] Currently, many industrial productions are using fossil fuels such as petroleum, natural gas, and coal to provide high-quality heat energy, which has the disadvantage of easily producing carbon dioxide, causing air pollution, and accelerating global warming. Solar energy is abundant and clean, and converting solar radiation into chemical fuel for energy storage is an engineering-challenging frontier technology.

[0003] Chemical fuels have the advantages of being transportable and long-term storable, which is important because energy demand is rarely synchronized or geographically matched with incident solar radiation. In order to effectively convert solar high-temperature heat into chemical fuels in the "solar belt" area, an industrially efficient light absorption process is needed, which can be carried out at a temperature of 500-1500℃. This presents various important industrial thermochemical energy storage processes that can utilize solar high-temperature heat sources as process heat, such as two-step water splitting cycles of metal oxides, natural gas reforming, coal gasification, and solar high-temperature hydrogen production, etc. High-temperature thermochemical energy storage using solar energy is an important development direction in the future.

[0004] The combustion of metal nanoparticles or powders can release high-density energy, for example, grinding iron powder very fine, the iron powder is easy to burn and quickly produces high temperature, releases energy during oxidation, zero emission of pollution, only produces iron ash or iron oxide; then the reduction of iron oxide to iron powder can be achieved by a solar concentrator to provide a high-temperature heat source, thereby realizing the chemical storage of solar energy. Iron powder as a combustible clean energy storage medium has advantages including low price and abundance, easy transportation and high energy density, high combustion temperature up to 1800℃, and does not need to be cooled at low temperature, nor to lose any energy during long-term storage. Therefore, it is particularly important to innovate a metal powder fuel production system with solar high-multiple light supply heat, which can achieve high-density chemical storage of solar energy, and is clean and environmentally friendly. SUMMARY

[0005] The present application provides a Fe3O4 reduced iron powder fuel production system with solar high-multiple light supply heat, which realizes the storage of solar radiation energy in iron powder fuel and provides high-quality metal fuel for industrial applications.

[0006] The technical scheme of the present application is as follows: a solar high-multiple light concentration heat supply Fe3O4 reduced iron powder fuel production system, which comprises a feeding device for containing carbon powder and Fe3O4 powder raw materials which have been stirred and mixed according to a reaction ratio, a reaction device for absorbing high-density sunlight energy collected by a solar light concentrator and performing high-temperature chemical reaction on the powder raw materials, a cooling device for receiving output reaction products of the reaction device and performing cooling, a sorting device for receiving the cooled products in the cooling device and performing sorting, and a gas collecting device for collecting gas products in the reaction device and the cooling device; the feeding device comprises a storage tank A for containing reaction raw materials and having a conical hopper shape at the lower end, a cover plate for sealing at the top of the storage tank A, a heating pipe for preheating the reaction raw materials in the storage tank A, a gas pump for communicating with the storage tank A and pumping the gas therein, and an adjusting valve A for controlling the flow of the raw materials in a feeding pipe A which is in communication with the conical hopper outlet at the lower end of the storage tank A; the reaction device comprises a heat preservation cavity which is open at the front end and has a rotary cavity shape, a secondary light concentrator with liquid cooling which is installed at the front end of the heat preservation cavity and is used for further converging sunlight, a quartz glass which is fixed at the frontmost end of the secondary light concentrator and is used for sealing and isolating external air, an outer fixed cylinder which is coaxially fixed in the heat preservation cavity and can transmit sunlight, a rotating cylinder which is coaxially located in the outer fixed cylinder and is opposite to the outer fixed cylinder and has a full-open front end and a light-transmitting cylindrical tube shape, a connecting shaft which is coaxially fixed at the tail end of the rotating cylinder and passes through the heat preservation cavity, and a motor which provides torque for the connecting shaft and has a housing fixed to the heat preservation cavity; the outer fixed cylinder is fixed to the heat preservation cavity through a plurality of light-transmitting support blocks along the circumference thereof; the full-open front end of the rotating cylinder faces the direction of receiving sunlight; the outer fixed cylinder is in contact and sealed with the rotating cylinder through the annular rings at both ends thereof to form a ring cavity, the feeding pipe A at the lower end of the storage tank A is in communication with the ring cavity to transport the raw materials to the ring cavity; the cylindrical outer surface of the rotating cylinder which is located in the ring cavity is provided with a spiral boss for transporting reaction raw materials, and the height of the boss is slightly lower than the height of the ring cavity; a conical hopper outlet for the reaction product in the ring cavity is arranged at the lower end of the circumference of the rotating cylinder close to the tail end thereof, and the conical hopper outlet is connected with a feeding pipe B which leads to the inside of the cooling device; bearings are arranged in the region where the connecting shaft passes through the heat preservation cavity to support the connecting shaft; the cooling device comprises a storage tank B which has a conical hopper shape at the lower end for facilitating material falling, an adjusting valve B for controlling the flow of the materials in a feeding pipe C which is in communication with the conical hopper outlet at the lower end of the storage tank B, a plurality of cooling coils which are located in the storage tank B and are close to the lower end and are in communication by being bent, a storage tank and a hydraulic pump which respectively provide cooling medium and power for the cooling coils; the hydraulic pump pumps the medium in the storage tank to the cooling coils, the outlet of the cooling coils is in communication with one end of the heating pipe, and the other end of the heating pipe returns the medium to the storage tank; the other end of the feeding pipe C is located above the inside of the sorting device.The sorting device includes a storage bin C, a magnetic conveyor belt located below the conveying pipe C to receive and transport materials, a uniform material plate to ensure uniform material thickness on the horizontal section of the magnetic conveyor belt and adjust the material thickness, a shovel plate to remove magnetic powder from the horizontal section below the magnetic conveyor belt, a collection bin A for collecting magnetic powder, and a collection bin B for collecting residual carbon powder. The storage bin C has two conical hopper structures at its lower end; the outlet of the left conical hopper connects to collection bin A, and the outlet of the right conical hopper connects to collection bin B. The magnetic conveyor belt has a vertical transmission section located above the right conical hopper, where gravity causes non-magnetic carbon powder to fall into the right conical hopper, which is then fed back into the feeding device for reuse. The shovel plate contacts the magnetic conveyor belt above the left conical hopper, shoveling magnetic powder into the left conical hopper. The shovel plate is made of a non-magnetic material.

[0007] Preferably, the solar concentrator is a parabolic dish concentrator or a tower heliostat array; both the outer fixed cylinder and the rotating cylinder are made of transparent, high-temperature resistant quartz material, and their surfaces are coated with an anti-reflective coating.

[0008] Preferably, the interior of the heat-insulating cavity is cylindrical and tapered at both ends; the inner surface of the heat-insulating cavity is provided with a diffuse reflection coating with low solar light absorption rate.

[0009] Preferably, the fully open front end of the rotating cylinder is fitted with quartz glass; the liquid medium in the storage tank is a high-temperature heat transfer fluid with added nanoparticles to enhance heat exchange.

[0010] Preferably, the secondary concentrator is a liquid-cooled structure with a sandwich layer, and its outer circumferential layer is wrapped with a heat insulation layer; the reflective surface of the secondary concentrator is a conical or composite parabolic geometric structure that realizes the convergence of sunlight, and the reflective surface is coated with a high-temperature resistant reflective coating with high reflectivity to sunlight.

[0011] Preferably, the gas collection device includes a one-way valve connected to the cooling device via a pipeline, a gas collection bottle connected to the outlet of the one-way valve, and a cooler for fully cooling the medium in the pipeline between the one-way valve and the gas collection bottle; the cooler is filled with a liquid heat exchange medium, and the one-way valve allows the gas in the cooling device to flow unidirectionally into the gas collection bottle; the outlet of the cooler is connected to the liquid cooling medium inlet of the secondary concentrator.

[0012] Preferably, in addition to meeting the required ratio for the chemical reaction 4C + Fe3O4 → 4CO + 3Fe, the mass of the carbon powder is doubled to ensure the full implementation of the reduction reaction.

[0013] Compared with the prior art, the present application has the beneficial effects that: the present application forms a ring cavity by the outer fixed cylinder and the rotating cylinder which are both light-transmitting, and transports the reaction raw materials at a controllable speed by the spiral boss on the surface of the rotating cylinder in the ring cavity, so that the light energy can be maximally absorbed and the reduction reaction can be completed; the reduction products in the reaction device are input into the cooling device for cooling, and the absorbed heat energy is recycled to the feeding device for preheating the raw materials, so that the heat energy utilization efficiency is effectively improved; the cooled reduction products are transported into the sorting device, and the magnetic force is used to sort the magnetic medium such as iron powder and the very small residual Fe3O4 in the products, and the non-magnetic carbon powder is separated and reused; the gas collecting device is communicated with the cooling device through a one-way valve, and the gas entering the gas collecting device is fully cooled by the cooler, so that the problem of pressure increase caused by the increase of gas products in the gas collecting device and the reaction device is solved; in general, the present application has the advantages of efficient heat absorption of reactants, controllable transportation, full recycling of solar heat energy, and the like, and can realize efficient reduction reaction and has a simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the Fe3O4 reduction iron powder fuel production system of the present application.

[0015] Figure 2 It is an enlarged view of the particle reaction device and the feeding device in Figure 1

[0016] In the figure: 1-feeding device; 101-storage tank A; 102-cover plate; 103-regulating valve A; 104-air pump; 105-heating pipe; 2-reaction device; 201-heat preservation cavity; 202-secondary condenser; 203-quartz glass; 204-outer fixed cylinder; 205-rotating cylinder; 206-connection shaft; 207-motor; 3-cooling device; 301-storage tank B; 302-cooling coil; 303-hydraulic pump; 304-liquid storage tank; 305-regulating valve B; 306-inclined baffle; 4-sorting device; 401-storage tank C; 402-uniform material plate; 403-magnetic conveying belt; 404-scooping plate; 405-material collecting tank A; 406-material collecting tank B; 5-gas collecting device; 501-one-way valve; 502-cooler; 503-gas collecting bottle. DETAILED DESCRIPTION

[0017] The present application will be further described below in conjunction with the drawings.

[0018] As Figure 1 and Figure 2 ​As shown, a solar high-multiple light concentration heating Fe3O4 reduced iron powder fuel production system, including the supply device 1 containing the carbon powder and Fe3O4 powder raw materials which have been stirred fully according to the reaction ratio, the reaction device 2 which absorbs the high-density sunlight energy collected by the solar light concentrator and carries out high-temperature chemical reaction on the fine particles or powder raw materials, the cooling device 3 which receives the output reaction products of the reaction device 2 and carries out cooling, the sorting device 4 which receives the cooled products in the cooling device 3 and carries out sorting, the gas collecting device 5 for collecting the gas products in the reaction device 2 and the cooling device 3; the supply device 1 includes a storage tank A101 for containing the reaction raw materials and the lower end is in the shape of a cone hopper, a cover plate 102 for sealing located at the top of the storage tank A101, a heating pipe 105 for preheating the reaction raw materials in the storage tank A101, a gas pump 104 which communicates with the storage tank A101 and pumps the gas therein, and an adjusting valve A103 for controlling the flow of raw materials in the feed pipe A which communicates with the lower end cone hopper outlet of the storage tank A101; the reaction device 2 includes a heat preservation cavity 201 which is open at the front end and in the shape of a rotating cavity, a secondary light concentrator 202 with liquid cooling installed at the front end of the heat preservation cavity 201 for further converging sunlight, a quartz glass 203 fixed at the frontmost end of the secondary light concentrator 202 for sealing and isolating external air, an outer fixed cylinder 204 coaxially fixed in the heat preservation cavity 201 which can transmit sunlight, a light-transmitting cylindrical rotating cylinder 205 coaxially located in the outer fixed cylinder 204 and rotating opposite to it, a connecting shaft 206 coaxially fixed at the tail end of the rotating cylinder 205 and passing through the heat preservation cavity, a motor 207 providing torque for the connecting shaft 206 and the housing of which is fixed to the heat preservation cavity; the outer fixed cylinder 204 is fixed to the heat preservation cavity 201 by a plurality of light-transmitting support blocks along its circumference; the fully open front end of the rotating cylinder 205 faces the direction of receiving sunlight; the outer fixed cylinder 204 is in contact with the rotating cylinder 205 through the annular rings at both ends to form an annular cavity, the feed pipe A at the lower end of the storage tank A101 communicates with the annular cavity to transport raw materials to the annular cavity; the cylindrical outer surface of the rotating cylinder 205 located in the annular cavity is provided with a spiral boss for transporting reaction raw materials, and the height of the spiral boss is slightly lower than the height of the annular cavity; the circumferential lower part of the rotating cylinder 205 near its tail end is provided with a conical hopper outlet for the reaction products in the annular cavity, and the lower end of the conical hopper outlet is connected with a feed pipe B leading to the inside of the cooling device 3; the area where the connecting shaft 206 passes through the heat preservation cavity 201 is provided with a bearing pair to support the connecting shaft; the cooling device 3 includes a storage tank B301 provided with a conical hopper at the lower end for facilitating material falling, an adjusting valve B305 for controlling the flow of materials in the feed pipe C which communicates with the conical hopper outlet at the lower end of the storage tank B, a plurality of cooling coils 302 located in the storage tank B301 and close to the lower end and communicating in a zigzag manner, a liquid tank 304 and a hydraulic pump 303 for providing cooling medium and conveying power for the cooling coils 302 respectively.The hydraulic pump 303 pumps the medium in the storage tank 304 to the cooling coil 302, the outlet of the cooling coil 302 is communicated with one end of the heating pipe 105, and the other end of the heating pipe 105 returns the medium to the storage tank 304; the other end of the material conveying pipe C is located above the inside of the sorting device 4; the sorting device 4 comprises a storage tank C401, a magnetic conveying belt 403 located below the material conveying pipe C and receiving and conveying the material, a material uniformizing plate 402 for making the material thickness on the horizontal section of the magnetic conveying belt 403 uniform and adjusting the material thickness, a material shoveling plate 404 for removing the magnetic powder on the horizontal section below the magnetic conveying belt 403, a material collecting tank A405 for collecting the magnetic powder, and a material collecting tank B406 for collecting the residual carbon powder; the lower end of the storage tank C401 is provided with two conical hopper structures, the outlet of the left conical hopper is communicated with the material collecting tank A405, and the outlet of the right conical hopper is communicated with the material collecting tank B406; the magnetic conveying belt 403 is provided with a vertical conveying section and is located above the right conical hopper, and the non-magnetic carbon powder falls into the right conical hopper by gravity, and the carbon powder is input into the feeding device 1 again for reuse; the position of the material shoveling plate 404 in contact with the magnetic conveying belt 403 is located above the left conical hopper, and the magnetic powder is shovelled into the left conical hopper; the material shoveling plate 404 is made of a non-magnetic material.

[0019] Preferably, the solar concentrator is a parabolic dish concentrator or a tower heliostat array or the like high-magnification concentrating device; the outer fixed cylinder 204 and the rotating cylinder 205 are made of quartz material of transparent material and high-temperature resistant, and the surfaces are coated with an anti-reflection coating.

[0020] Preferably, the inside of the heat preservation cavity 201 is in a cylindrical, conical or the like cavity structure with the two ends being necked; the inner surface of the heat preservation cavity 201 is provided with a diffuse reflection coating with low solar absorption.

[0021] Preferably, the full-opening front end of the rotating cylinder 205 is provided with a quartz glass; the liquid medium of the storage tank 304 is a heat-conducting oil or a high-temperature resistant heat transfer fluid with nano-particle enhanced heat exchange.

[0022] Preferably, the secondary concentrator 202 is a liquid cooling structure with a sandwich structure, which is wrapped with a heat preservation layer in the circumference; the reflective surface of the secondary concentrator 202 is a conical or compound parabolic surface geometry for realizing solar light convergence, and the reflective surface is coated with a high-temperature resistant reflective coating with high reflectivity to solar light.

[0023] Preferably, the gas collecting device 5 comprises a one-way valve 501 communicating with the cooling device 3 through a pipeline, a gas collecting bottle 503 communicating with the outlet of the one-way valve 501, and a cooler 502 for sufficiently cooling the medium in the pipeline between the one-way valve 501 and the gas collecting bottle 503; the cooler 502 is internally provided with a liquid heat exchange medium, the one-way valve 501 can only allow the gas in the cooling device 3 to flow to the gas collecting bottle 503 in one direction; the outlet of the cooler 502 communicates with the liquid cooling medium inlet of the secondary condenser 202.

[0024] Preferably, the mass mixing ratio of the carbon powder and the Fe3O4 powder is 1:1, and the mass of the carbon powder is increased by 1 times in addition to the required proportion for the chemical reaction of 4C+Fe3O4-4CO+3Fe.

Claims

1. A solar-powered high-concentration heat-generating Fe3O4 reduced iron powder fuel production system, characterized in that: The application relates to a device for producing carbon nanotubes, which comprises a feeding device for storing carbon powder and Fe3O4 powder, a reaction device for absorbing high-density solar energy and performing high-temperature chemical reaction on the powder, a cooling device for receiving the output of the reaction device and cooling the output, a sorting device for receiving the cooled output of the cooling device and sorting the output, and a gas collecting device for collecting the gas output of the reaction device and the cooling device. The feeding device comprises a storage tank A for storing reaction materials and having a conical hopper-shaped lower end, a cover plate for sealing the top of the storage tank A, a heating pipe for preheating the reaction materials in the storage tank A, a gas pump connected to the storage tank A and used for pumping the gas in the storage tank A, and an adjusting valve A used for controlling the flow of the materials in a feeding pipe A connected to the conical hopper-shaped lower end of the storage tank A. The reaction device comprises a heat-insulating cavity with an open front end and a rotating cavity, a secondary light collector with liquid cooling and arranged at the front end of the heat-insulating cavity and used for further converging solar light, a quartz glass fixed to the front end of the secondary light collector and used for sealing and isolating external air, an outer fixed cylinder coaxially fixed in the heat-insulating cavity and capable of transmitting solar light, a rotating cylinder coaxially arranged in the outer fixed cylinder and capable of transmitting solar light, a connecting shaft coaxially fixed to the tail end of the rotating cylinder and penetrating through the heat-insulating cavity, and a motor used for providing torque for the connecting shaft and fixed to the heat-insulating cavity. The outer fixed cylinder is fixed to the heat-insulating cavity through a plurality of light-transmitting supporting blocks arranged along the circumference of the outer fixed cylinder. The open front end of the rotating cylinder faces the direction of receiving solar light. The outer fixed cylinder is in contact with the rotating cylinder through the annular rings arranged at the two ends of the outer fixed cylinder to form a ring cavity. The feeding pipe A arranged at the lower end of the storage tank A is connected to the ring cavity to transport the materials to the ring cavity. The cylindrical outer surface of the rotating cylinder in the ring cavity is provided with a spiral boss used for transporting the reaction materials, and the height of the boss is slightly lower than the height of the ring cavity. A conical hopper-shaped outlet is arranged at the lower end of the rotating cylinder and used for discharging the reaction materials in the ring cavity. The conical hopper-shaped outlet is connected to a feeding pipe B penetrating through the heat-insulating cavity and leading to the inside of the cooling device. Bearings are arranged in the region where the connecting shaft penetrates through the heat-insulating cavity to support the connecting shaft. The cooling device comprises a storage tank B with a conical hopper-shaped lower end used for conveniently discharging materials, an adjusting valve B used for controlling the flow of the materials in a feeding pipe C connected to the conical hopper-shaped lower end of the storage tank B, a plurality of cooling coils arranged in the storage tank B and close to the lower end and used for being in communication with each other, a storage tank and a hydraulic pump used for providing cooling medium and conveying power for the cooling coils. The hydraulic pump pumps the medium in the storage tank to the cooling coils. The outlet of the cooling coils is connected to one end of a heating pipe. The other end of the heating pipe is connected to the storage tank to return the medium to the storage tank. The other end of the feeding pipe C is arranged above the inside of the sorting device. The sorting device comprises a storage tank C, a magnetic conveying belt below the storage tank C for receiving and conveying materials, a material uniformizing plate for making the material thickness on the horizontal section of the magnetic conveying belt uniform and adjusting the material thickness, a material shoveling plate for removing the magnetic powder on the horizontal section below the magnetic conveying belt, a material collecting tank A for collecting the magnetic powder, and a material collecting tank B for collecting residual carbon powder; the lower end of the storage tank C is provided with two conical hopper structures, the outlet of the left conical hopper is communicated with the material collecting tank A, and the outlet of the right conical hopper is communicated with the material collecting tank B; the magnetic conveying belt is provided with a vertical conveying section and is located above the right conical hopper, and the non-magnetic carbon powder falls into the right conical hopper by gravity and is input into the feeding device again for reuse; the position of the material shoveling plate in contact with the magnetic conveying belt is located above the left conical hopper, and the magnetic powder is shovelled into the left conical hopper; the material shoveling plate is made of non-magnetic material.

2. The solar high concentration light heat Fe304 reduced iron powder fuel production system according to claim 1, characterized in that: The solar concentrator is a parabolic dish concentrator or a tower type heliostat array; the outer fixed cylinder and the rotating cylinder are made of quartz material with high temperature resistance and transparent material, and the surfaces are coated with an anti-reflection coating.

3. The solar high concentration light heat Fe304 reduced iron powder fuel production system of claim 1, wherein: The heat preservation cavity is internally cylindrical and conical with two necked ends; the inner surface of the heat preservation cavity is provided with a diffuse reflection coating with low solar absorption.

4. The solar high concentration of light heat Fe304 reduced iron powder fuel production system according to claim 1, characterized in that: The full opening front end of the rotating cylinder is provided with a quartz glass; the liquid medium of the liquid storage tank is a high-temperature resistant heat transfer fluid with nano-particle enhanced heat exchange.

5. The solar high concentration of light heat Fe304 reduced iron powder fuel production system of claim 1, wherein: The secondary concentrator is a liquid cooling structure with a sandwich structure, and is externally wrapped with a heat preservation layer; the reflective surface of the secondary concentrator is a conical or compound parabolic surface geometry for realizing solar light convergence, and the reflective surface is coated with a high-temperature resistant reflective coating with high solar reflectivity.

6. The solar high concentration of light heat Fe304 reduced iron powder fuel production system of claim 1, wherein: The gas collecting device comprises a one-way valve communicated with the cooling device through a pipeline, a gas collecting bottle communicated with the outlet of the one-way valve, and a cooler for fully cooling the medium in the pipeline between the one-way valve and the gas collecting bottle; the cooler is internally communicated with a liquid heat exchange medium, the one-way valve can only make the gas in the cooling device unidirectionally flow into the gas collecting bottle; the outlet of the cooler is communicated with the liquid cooling medium inlet of the secondary concentrator.

7. The solar high concentration of light heat Fe304 reduced iron powder fuel production system of claim 1, wherein: The mass mixing ratio of the carbon powder and the Fe3O4 powder is increased by 1 times in addition to the required ratio of the 4C+Fe3O4-4CO+3Fe chemical reaction.

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