Ironmaking system for gas-based shaft furnace

Abstract

The utility model discloses an iron-making system for a gas-based shaft furnace. The system comprises gas production equipment, hydrogen-carbon adjusting equipment, reducing gas temperature adjusting equipment, the gas-based shaft furnace, gas dust removing equipment, circulating gas purifying equipment and circulating gas pressurizing equipment. According to the scheme provided by the utility model, the reducing gas of high-concentration carbon monoxide and hydrogen is generated by high-pressure gasification of the carbon-containing substance, and the hydrogen-carbon ratio can be further adjusted to obtain the gas required by the efficient gas-based shaft furnace, so that a set of reducing atmosphere-adjustable preparation process system for reducing ironmaking by the gas-based shaft furnace is obtained; the problem that in the prior art, a gas-based shaft furnace depends on scarce energy such as natural gas is solved.

Description

Technical Field

[0001] This utility model relates to the field of gas-based vertical shaft furnace technology, and in particular to an ironmaking system for a gas-based vertical shaft furnace. Background Technology

[0002] With increasing global environmental and resource pressures, the drawbacks of traditional blast furnace ironmaking processes are becoming increasingly prominent, mainly manifested in: heavy reliance on coking coal; inability to handle complex polymetallic ores; large-scale plant production, numerous process steps, and the need for huge investments; the large amounts of flue gas, dust, and water pollution generated by the coking-sintering-blast furnace-converter system, which have increasingly serious environmental impacts; and the long and complex process of the coking-sintering-blast furnace-converter-casting and rolling ironmaking system, resulting in low thermal efficiency and serious energy waste. In recent years, with the annual increase in my country's steel production, coking coal resources are facing depletion, and traditional coking coal metallurgical processes will be unable to operate normally. In particular, the introduction of "carbon peaking" and "carbon neutrality" policies in recent years has placed higher demands on domestic metallurgical technology.

[0003] Direct reduction ironmaking can use a variety of fuels as energy sources to produce direct reduced iron with low impurity content, making it an ideal method to overcome resource scarcity and solve environmental pollution problems.

[0004] Gas-based direct reduction ironmaking technology, using reducing gases as reducing agents, boasts a fast reaction rate, high production efficiency, and high energy utilization, making it superior to coal-based direct reduction. Gas-based direct reduction ironmaking can directly produce solid sponge iron. Its advantages include a short process flow, no coke ovens or sintering plants, and less pollution. Currently, the main technologies are MIDREX and HYL. The disadvantage is that both processes require large quantities of natural gas, and their reducing gas mainly relies on natural gas reforming. Therefore, the bottleneck lies in the availability of cheap and abundant natural gas resources. For China, the characteristics of its iron ore resources—"many low-grade ores with complex compositions"—and its energy structure—"abundant coal but scarce gas"—are not suitable for developing gas-based direct reduction processes using natural gas reforming to produce reducing gas. To date, industrial-scale production equipment for gas-based vertical shaft furnace direct reduction technology is still scarce in my country, with only two projects currently in use. Utility Model Content

[0005] The purpose of this invention is to provide an ironmaking system for a gas-based vertical shaft furnace, so as to at least partially solve the above-mentioned problems of the prior art.

[0006] To achieve the above objectives, one aspect of this utility model provides an ironmaking system for a gas-based vertical shaft furnace, comprising: gas production equipment, hydrogen and carbon regulation equipment, reducing gas temperature regulation equipment, a gas-based vertical shaft furnace, gas dust removal equipment, circulating gas purification equipment, and circulating gas pressurization equipment; wherein

[0007] The gas production equipment is used to produce reducing gas including hydrogen and carbon monoxide by chemically reacting carbonaceous substances with oxygen under high temperature and high pressure.

[0008] The hydrogen-carbon regulating device is used to receive the reducing gas output from the gas production equipment, and to react with the reducing gas through water or water vapor in the presence of a catalyst to regulate the ratio of hydrogen to carbon monoxide in the reducing gas.

[0009] The reducing gas temperature control device is used to receive and adjust the temperature of the reducing gas output by the hydrogen-carbon regulating device;

[0010] The gas-based vertical furnace is used to receive the reducing gas output from the reducing gas temperature control equipment, and to reduce the pellets under high pressure and high temperature using the reducing gas.

[0011] The gas dust removal equipment is used to receive the exhaust gas from the top of the gas-based vertical furnace and remove dust particles from the exhaust gas.

[0012] The circulating gas pressurizing device is used to receive the exhaust gas after dust removal by the gas dust removal device and pressurize the exhaust gas;

[0013] The circulating gas purification equipment is used to receive the exhaust gas after it has been pressurized by the circulating gas pressurization equipment, perform desulfurization and / or decarbonization treatment on the exhaust gas, and output the treated reducing gas to the reducing gas temperature control equipment.

[0014] Preferably, the hydrogen-carbon regulating device is also used to connect to a hydrogen source and adjust the ratio of hydrogen and carbon monoxide in the reducing gas by inputting hydrogen.

[0015] Preferably, the circulating gas purification device is connected to the reducing gas temperature control device through the hydrogen-carbon regulating device, and outputs the reducing gas to the hydrogen-carbon regulating device;

[0016] The hydrogen-carbon regulating device mixes the reducing gas output from the gas production device and the reducing gas input from the circulating gas purification device, adjusts the ratio of hydrogen to carbon monoxide in the reducing gas, and outputs the ratio-adjusted reducing gas to the reducing gas temperature regulating device.

[0017] Preferably, the circulating gas purification equipment is further configured to receive the reducing gas output from the hydrogen-carbon regulating equipment, perform desulfurization and / or decarbonization treatment on the reducing gas, and then output it to the reducing gas temperature regulating equipment.

[0018] Preferably, the gas production equipment includes a gasification furnace.

[0019] Preferably, the gas production equipment further includes:

[0020] Cyclone dust collector is used to remove dust particles from the reducing gas;

[0021] A cooler is used to lower the temperature of the reducing gas.

[0022] Preferably, the reducing gas temperature control device includes multiple heaters, which are respectively connected to the hydrogen-carbon regulating device, for receiving the reducing gas output from multiple channels of the hydrogen-carbon regulating device;

[0023] The plurality of heaters are respectively connected to the gas-based vertical furnace and are used to heat the reducing gas to different temperatures and then output the reducing gas at different temperatures to the gas-based vertical furnace.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] The solution provided by this invention utilizes high-pressure gasification of carbonaceous materials to generate a reducing gas of carbon monoxide and hydrogen. The hydrogen-carbon ratio can be adjusted to obtain the gas required for a high-efficiency gas-based vertical shaft furnace. This results in a gas-based vertical shaft furnace reduction ironmaking process system with an adjustable reducing atmosphere, overcoming the dependence on natural gas in existing gas-based vertical shaft furnaces. Furthermore, the process system provided by this invention is simple, technologically sound, and cost-effective. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a gas-based vertical shaft furnace ironmaking system provided for an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram illustrating the application process of an ironmaking system for a gas-based vertical shaft furnace, provided as an embodiment of the present invention. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate to understand the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a product or device comprising a series of units is not necessarily limited to those explicitly listed, but may include other units not explicitly listed or inherent to such product or device.

[0030] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linked," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] Embodiment 1 of this utility model provides an ironmaking system for a gas-based vertical shaft furnace. Figure 1 A schematic diagram of the system structure is shown. For example... Figure 1As shown, the system includes: gas production equipment 10, hydrogen and carbon conditioning equipment 20, reducing gas temperature control equipment 30, gas-based vertical furnace 40, gas dust removal equipment 50, circulating gas pressurization equipment 60, and circulating gas purification equipment 70.

[0036] Gas production equipment 10 is used to produce reducing gas, including hydrogen and carbon monoxide, by reacting carbonaceous materials with oxygen under high temperature and pressure. Gas production equipment 10 can be, for example, a gasifier in coal gasification technology. The carbonaceous materials include coal, coke, biomass, municipal waste, etc., which react with oxygen / air or steam under high temperature and pressure in different forms. Higher concentrations of hydrogen and carbon monoxide produced are more beneficial to the downstream gas-based vertical shaft furnace system, and the lower the energy consumption of the unit. This gas production equipment 10 can be equipped with a cyclone dust collector and a cooler. The cyclone dust collector removes dust particles from the reducing gas; the cooler lowers the temperature of the reducing gas. Dust removal and cooling can also be achieved through a full / semi-waste boiler method to obtain the required reducing gas.

[0037] In one embodiment, carbonaceous materials such as coal, biomass, and municipal waste from the material yard are crushed and dried, then transported to a gas production device 10 under high pressure and dense phase. There, they undergo a gasification reaction with high-pressure oxygen / steam at a pressure of 2.0–6.5 MPaG and a temperature of 1200–1500°C. After heat recovery, the reducing gas is cooled to 180–230°C and then fed into a hydrogen-carbon regulating device 20.

[0038] The hydrogen-carbon regulating device 20 is used to receive the reducing gas output from the gas production device 10, and to regulate the ratio of hydrogen to carbon monoxide in the reducing gas by reacting it with water or water vapor in the presence of a catalyst. In a preferred embodiment, the hydrogen-carbon regulating device is also used to connect to a hydrogen source, thereby regulating the ratio of hydrogen to carbon monoxide in the reducing gas by inputting hydrogen.

[0039] The main function of the hydrogen-carbon conditioning device 20 is to convert the reducing gas produced by the gasification furnace system into hydrogen and carbon dioxide by reacting carbon monoxide with water under the action of a catalyst, through the addition of water or steam. By adjusting the amount of water and steam added and designing a quantitative catalyst, the conversion rate of carbon monoxide to hydrogen can be achieved, thereby regulating the ratio of hydrogen to carbon monoxide in the reducing gas; or the ratio of hydrogen to carbon monoxide can be adjusted by adding other hydrogen sources. If the proportion of hydrogen is high, the reaction of hydrogen with carbon dioxide can also be adjusted to increase the proportion of carbon monoxide. Therefore, the hydrogen-carbon conditioning device 20 can provide the gas composition required by the downstream system, thus helping to maximize the comprehensive utilization rate of gas in the gas-based vertical shaft furnace. The carbon monoxide and hydrogen content in the reducing gas purified from the gas purification tower (C2) can preferably reach 90-98%, and the ratio of hydrogen to carbon monoxide can be adjusted from 8 to 0.5 as needed.

[0040] The reducing gas temperature control device 30 is used to receive and regulate the temperature of the reducing gas output from the hydrogen-carbon regulating device. For example, the reducing gas temperature control device 30 can be a heating furnace, which uses electrical or chemical energy to heat the reducing gas from the hydrogen-carbon regulating device to the temperature required for the reduction reaction in the gas-based vertical shaft furnace. If the temperature is too high, the reducing gas temperature control device 30 may also include a cooler to lower the temperature of the reducing gas output from the hydrogen-carbon regulating device 20 to meet the needs of the gas-based vertical shaft furnace.

[0041] In one embodiment, the reducing gas temperature control device 30 includes multiple heaters, each connected to the hydrogen-carbon regulating device, for receiving the reducing gas output from multiple channels of the hydrogen-carbon regulating device; the multiple heaters are respectively connected to the gas-based vertical furnace, for heating the reducing gas to different temperatures (adjustable between 800 and 1050°C according to the reaction efficiency), and then outputting reducing gas at different temperatures to the gas-based vertical furnace. The reducing gas at different temperatures can be fed into different reaction zones of the gas-based vertical furnace 40.

[0042] A gas-based vertical shaft furnace 40 is used to receive the reducing gas output from the reducing gas temperature control device 30, and to reduce iron ore pellets under high pressure and high temperature using the reducing gas. The gas-based vertical shaft furnace can be an existing gas-based vertical shaft furnace, but it does not need to use natural gas as a gas source; instead, it receives the reducing gas supplied by the reducing gas temperature control device 30. In a preferred embodiment, the gas-based vertical shaft furnace 40 receives a specific proportion of reducing gas through multiple channels, and reduces the iron ore pellets introduced from the top under high pressure and high temperature. By adjusting the flow rate and composition of the reducing gas, the maximum conversion efficiency of pellet reduction ironmaking is improved, thereby minimizing the amount of reducing gas used and maximizing the output of the vertical shaft furnace. In one embodiment, the reducing gas is fed into the high-pressure gas-based vertical shaft furnace 40 to react with the iron ore pre-loaded in the furnace. The furnace is divided into several zones according to the working state of the reducing gas. Finally, the gas that has undergone the reduction reaction with the iron ore is discharged from the top outlet of the high-pressure gas-based vertical shaft furnace at a temperature of approximately 450–600°C.

[0043] The high-pressure gas-based vertical shaft furnace 40 utilizes a variable-pressure lock hopper to achieve low-pressure receiving and high-pressure feeding, meeting its capacity requirements. The feeding area is equipped with a low-pressure chamber, a variable-pressure chamber, and a high-pressure chamber. Within a cycle, the variable-pressure chamber receives material in the low-pressure chamber, pressurizes the gas, connects to the high-pressure chamber for feeding, and then depressurizes through exhaust, thus continuously feeding pellets into the high-pressure gas-based vertical shaft furnace 40. The lower part of the high-pressure gas-based vertical shaft furnace 40 is equipped with a cooling system and a rotary unloading device. The cooling system uses circulating cooling gas to cool the pellets. The rotary unloading device continuously feeds high-temperature direct reduced iron into the lower discharge system. The discharge system uses a high-temperature variable-pressure lock hopper to achieve a cycle of high-pressure receiving, depressurization, low-pressure unloading, and gas pressurization, ensuring continuous product unloading from the high-pressure gas-based vertical shaft furnace while preventing product breakage. The high-temperature variable-pressure lock hopper is pressurized with high-pressure N2, and the gas is discharged after washing and dust removal during depressurization.

[0044] A gas dust removal device 50 is used to receive the exhaust gas from the top of the gas-based vertical shaft furnace and remove dust particles from the exhaust gas. In a preferred embodiment, the device may include a gas heat recovery heat exchanger, a gas scrubbing device, a gas-liquid separation device, etc. The exhaust gas from the top of the gas-based vertical shaft furnace passes through the gas heat recovery heat exchanger (e.g., a gas dust removal waste heat boiler), where its temperature drops to 150–200°C. Subsequently, cooling water is used to cool the gas in a scrubbing tower, where the cooling water has both dust removal and cooling effects. Finally, the gas is sent to a cooler for further cooling to 40°C.

[0045] The circulating gas pressurization device 60 receives the exhaust gas after dust removal by the gas dust removal device 50 and pressurizes the exhaust gas. This device pressurizes the dust-treated circulating gas and sends it into the gas-based vertical shaft furnace for recycling, which helps to maintain the reducing gas composition in the vertical shaft furnace.

[0046] The circulating gas purification device 70 receives the exhaust gas pressurized by the circulating gas pressurization device 60, performs desulfurization and / or decarbonization treatment on the exhaust gas, and outputs the treated reducing gas to the reducing gas temperature control device 30. The circulating gas purification device 70 may include a gas purification tower. The gas pressurized by the circulating gas pressurization device is sent to the gas purification tower to mix with fresh gas and remove acidic gases such as carbon dioxide and hydrogen sulfide. The purified gas is continuously circulated and finally sent to the high-pressure gas-based vertical shaft furnace. The removed high-concentration carbon dioxide can be recovered and reused through a carbon capture and recovery system to achieve carbon emission reduction.

[0047] In one embodiment, the circulating gas purification device 70 directly outputs the treated reducing gas to the reducing gas temperature control device 30, and the reducing gas temperature control device 30 only needs to supplement a small amount of reducing gas from the hydrogen-carbon regulating device 20.

[0048] In another embodiment, the circulating gas purification device 70 is connected to the reducing gas temperature control device 30 via the hydrogen-carbon regulating device 20, and outputs the reducing gas to the hydrogen-carbon regulating device 20; the hydrogen-carbon regulating device 20 mixes the reducing gas output from the gas production device and the reducing gas input from the circulating gas purification device, adjusts the ratio of hydrogen and carbon monoxide in the reducing gas, and outputs the ratio-adjusted reducing gas to the reducing gas temperature control device 30.

[0049] In another embodiment, the circulating gas purification device 70 can also directly send the purified reducing gas into the high-pressure gas-based vertical furnace 40 to accelerate circulation.

[0050] By adopting the ironmaking system for integrating a gasifier and a gas-based vertical shaft furnace provided in this embodiment, the reducing gas generator provides the vertical shaft furnace with the required high-pressure, high-temperature, and high-concentration reducing gas. The reducing gas can be adjusted in hydrogen-to-carbon ratio via a conversion device, or it can be mixed with green hydrogen produced by water electrolysis. The high-pressure gasification feedstock can be coal, coke, biomass, municipal waste, or other green and recyclable carbon-containing materials, which can diversely meet the resource conditions of the construction site and solve the problem of dependence on natural gas in existing gas-based vertical shaft furnaces. The gas dust removal system is a process technology that combines waste heat boiler cooling, cyclone dust removal, or water washing dust removal. It has a short process, high energy efficiency, and is suitable for large-scale modern low-carbon ironmaking plants. It can produce high-quality sponge iron and is a low-carbon alternative technology for blast furnace ironmaking.

[0051] To better understand the present invention, the system provided in this embodiment will be further described below through a preferred example process. Figure 2 A schematic diagram of the application process of this system is shown.

[0052] First, carbonaceous materials such as coal, biomass, and municipal waste from the material yard are crushed and dried, then transported under high pressure and dense phase to a gas production unit (F1). There, they undergo a gasification reaction with high-pressure oxygen / steam at a pressure of 2.0–6.5 MPaG and a temperature of 1200–1500°C. After heat recovery, the reducing gas (FG) is cooled to 180–230°C, with most of it fed into a hydrogen-carbon regulating reactor (HC) and a small portion fed into a hydrogen-carbon regulating reactor (HT) for use as fuel gas. In one implementation, a distributor can be installed to allocate the ratio of HC to HT gases, for example, a 1:9 ratio, which can be flexibly adjusted according to actual needs.

[0053] The reducing gas passes through a hydrogen-carbon conditioning reactor (HC) to adjust the ratio of carbon monoxide and hydrogen to the required ratio for the downstream system. It is then fed together with the recycle gas into a gas purification tower (C2) to remove acidic gases such as carbon dioxide, thereby increasing the proportion of reducing gas. The reducing gas purified by the gas purification tower (C2) contains 90-98% carbon monoxide and hydrogen, and the hydrogen-to-carbon monoxide ratio can be adjusted from 8 to 0.5 as needed.

[0054] The reducing gas, after being regulated by the hydrogen-carbon conditioning equipment, first passes through a gas purification tower (C2) to remove dust and other particulate matter. The purified reducing gas is generally at room temperature. Depending on the requirements of the high-pressure gas-based vertical shaft furnace (F2), the reducing gas temperature control equipment divides the reducing gas into two or more streams. These streams are then heated to different temperatures by different heaters (HT) (adjustable between 800 and 1050°C depending on the reaction efficiency) before being sent to different reaction zones within the high-pressure gas-based vertical shaft furnace (F2). The high-temperature flue gas from the heater (HT) outlet exchanges heat with the combustion air (Ar) through its upper heat exchange components to further recover heat from the high-temperature flue gas, while simultaneously increasing the temperature of the combustion air to reduce the amount of fuel gas used by the heater (HT).

[0055] The heated reducing gas is fed into the high-pressure gas-based shaft furnace (F2) through a gas distribution device at different height inlet positions. It reacts with pre-loaded iron ore pellets (ORE, produced by high-temperature roasting and solidification of green pellets made from iron concentrate or natural ore mixed with water and a pellet binder) to produce direct reduced iron (DRI). The shaft furnace is divided into several zones based on the working state of the reducing gas. Finally, the gas that has undergone the reduction reaction with the iron ore is discharged from the top nozzle of the high-pressure gas-based shaft furnace (F2) at a temperature of approximately 450–600°C.

[0056] After the high-pressure, high-temperature furnace top gas is fed into the waste heat boiler (E1) to recover heat, it is cooled to 150-200°C. Then, cooling water is used to cool the gas in the scrubbing tower (C1). The cooling water has the functions of dust removal and cooling. Finally, it is sent to the cooler (E2) for further cooling to 40°C.

[0057] After cooling, the circulating reducing gas is sent to the compressor (COM) for pressurization and then to the gas purification tower (C2) to mix with fresh gas (FG) to remove acidic gases such as carbon dioxide and hydrogen sulfide. The purified gas is then sent to the high-pressure gas-based vertical furnace (F2). The high-concentration carbon dioxide removed can be recovered and reused through a carbon capture and recovery system to achieve carbon emission reduction.

[0058] The high-pressure gas-based vertical shaft furnace (F2) uses a variable pressure lock hopper (V1) to achieve low-pressure material collection and high-pressure material feeding to meet the production capacity requirements of the high-pressure gas-based vertical shaft furnace. It is equipped with a low-pressure chamber, a variable pressure chamber, and a high-pressure chamber. Within one cycle, the variable pressure chamber collects material in the low-pressure chamber, pressurizes the gas, connects to the high-pressure chamber for feeding, and then depressurizes the exhaust gas, thus continuously feeding pellets into the high-pressure gas-based vertical shaft furnace (F2).

[0059] The lower part of the high-pressure gas-based vertical shaft furnace (F2) is equipped with a cooling system and a rotary unloading device. The cooling system cools the pellets by circulating cooling gas.

[0060] The rotary unloading device continuously feeds high-temperature direct reduced iron into the lower discharge system. The discharge system uses a high-temperature variable pressure lock hopper (V2) to achieve a cycle of four processes: high-pressure receiving, depressurization, low-pressure unloading, and gas pressurization. This ensures continuous product unloading from the high-pressure gas-based vertical shaft furnace while preventing product breakage. The high-temperature variable pressure lock hopper is pressurized with high-pressure N2, and the gas is discharged after being washed and dust-removed during depressurization.

[0061] By employing the ironmaking method for gas-based vertical shaft furnace fusion provided in this embodiment, the reducing gas generator provides the vertical shaft furnace with the required high-pressure, high-temperature, and high-concentration reducing gas. The reducing gas can be adjusted in hydrogen-to-carbon ratio via a shift converter, or it can be mixed with green hydrogen produced by water electrolysis. The high-pressure gasification feedstock can be coal, coke, biomass, municipal waste, or other green and recyclable carbon-containing materials, thus diversely meeting the resource conditions of the construction site and solving the problem of dependence on natural gas in existing gas-based vertical shaft furnaces. The gas dust removal system is a process technology that combines waste heat boiler cooling, cyclone dust removal, or water washing dust removal. It has a short process, high energy efficiency, and is suitable for large-scale modern low-carbon ironmaking plants, producing high-quality sponge iron. It is a low-carbon alternative technology for blast furnace ironmaking.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An ironmaking system for a gas-based vertical shaft furnace, characterized in that, include: Gas production equipment, hydrogen and carbon conditioning equipment, reducing gas temperature control equipment, gas-based vertical shaft furnaces, gas dust removal equipment, circulating gas purification equipment, and circulating gas pressurization equipment; among which The gas production equipment is used to produce reducing gas including hydrogen and carbon monoxide by chemically reacting carbonaceous substances with oxygen under high temperature and high pressure. The hydrogen-carbon regulating device is used to receive the reducing gas output from the gas production equipment, and to react with the reducing gas through water or water vapor in the presence of a catalyst to regulate the ratio of hydrogen to carbon monoxide in the reducing gas. The reducing gas temperature control device is used to receive and adjust the temperature of the reducing gas output by the hydrogen-carbon regulating device; The gas-based vertical furnace is used to receive the reducing gas output from the reducing gas temperature control equipment, and to reduce the pellets under high pressure and high temperature using the reducing gas. The gas dust removal equipment is used to receive the exhaust gas from the top of the gas-based vertical furnace and remove dust particles from the exhaust gas. The circulating gas pressurizing device is used to receive the exhaust gas after dust removal by the gas dust removal device and pressurize the exhaust gas; The circulating gas purification equipment is used to receive the exhaust gas after it has been pressurized by the circulating gas pressurization equipment, perform desulfurization and / or decarbonization treatment on the exhaust gas, and output the treated reducing gas to the reducing gas temperature control equipment.

2. The ironmaking system for a gas-based vertical shaft furnace according to claim 1, characterized in that, The hydrogen-carbon regulating device is also used to connect to a hydrogen source and adjust the ratio of hydrogen and carbon monoxide in the reducing gas by inputting hydrogen.

3. The ironmaking system for a gas-based vertical shaft furnace according to claim 1 or 2, characterized in that, The circulating gas purification device is connected to the reducing gas temperature control device through the hydrogen-carbon regulating device, and outputs the reducing gas to the hydrogen-carbon regulating device; The hydrogen-carbon regulating device mixes the reducing gas output from the gas production device and the reducing gas input from the circulating gas purification device, adjusts the ratio of hydrogen to carbon monoxide in the reducing gas, and outputs the ratio-adjusted reducing gas to the reducing gas temperature regulating device.

4. The ironmaking system for a gas-based vertical shaft furnace according to claim 1, characterized in that, The circulating gas purification equipment is also used to receive the reducing gas output from the hydrogen-carbon regulating equipment, perform desulfurization and / or decarbonization treatment on the reducing gas, and then output it to the reducing gas temperature regulating equipment.

5. The ironmaking system for a gas-based vertical shaft furnace according to claim 1, characterized in that, The gas production equipment includes a gasification furnace.

6. The ironmaking system for a gas-based vertical shaft furnace according to claim 1 or 4, characterized in that, The gas production equipment also includes: Cyclone dust collector is used to remove dust particles from the reducing gas; A cooler is used to lower the temperature of the reducing gas.

7. The ironmaking system for a gas-based vertical shaft furnace according to claim 1, characterized in that, The reducing gas temperature control device includes multiple heaters, which are respectively connected to the hydrogen-carbon regulating device, and are used to receive the reducing gas output from multiple channels of the hydrogen-carbon regulating device; The plurality of heaters are respectively connected to the gas-based vertical furnace and are used to heat the reducing gas to different temperatures and then output the reducing gas at different temperatures to the gas-based vertical furnace.

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