Regenerative converter gas reforming device, ironmaking system and ironmaking process

Abstract

The application provides a heat accumulating converter gas reforming device, an ironmaking system and an ironmaking process. Converter gas at the outlet of a converter is cooled first. The cooled converter gas and introduced natural gas or coke oven gas are reformed under the action of the heat of the converter gas itself, the catalysis of an auxiliary electric pressurizing device and iron oxides carried by the converter gas to generate reforming gas. At least part of the generated reforming gas is subjected to heat release and dust removal through a heat accumulating body. The heat accumulating body accumulates heat and intercepts converter gas ash at this time. At least part of the reforming gas after heat release and dust removal is pressurized and subjected to heat absorption through the heat accumulating body to realize the recovery of waste heat of the converter gas. The reforming gas after heat absorption enters the interior of a blast furnace to realize carbon recovery. At least part of the converter gas ash intercepted by the heat accumulating body is blown into the interior of the blast furnace to realize iron element recovery. The application realizes the coupling of the waste heat recovery process, the carbon recovery process and the iron element recovery process.

Description

Technical Field

[0001] This invention relates to the field of ironmaking production technology, and in particular to a regenerative converter gas reforming device, an ironmaking system, and an ironmaking process. Background Technology

[0002] Blast furnaces and converters are key pieces of equipment in the ironmaking system, working in tandem. The blast furnace is used to reduce iron ore, coke, and flux (such as limestone) at high temperatures to produce pig iron. This process removes oxygen from the iron ore by introducing carbon from air or auxiliary fuels (such as pulverized coal or natural gas) to react with oxygen. The converter, by introducing oxygen into the molten pig iron, carries out an oxidation reaction, reducing the carbon content in the iron (typically to 1.8%-2.1%) while removing impurities such as silicon, manganese, sulfur, and phosphorus, ultimately yielding molten steel.

[0003] During the converter operation, converter gas, after being discharged from the converter, undergoes a series of treatments including cooling and dust removal before entering the converter gas holder. The temperature of the converter gas is approximately 1450℃~1800℃, with a significant amount of waste heat that can be utilized. Current ironmaking systems use vaporization cooling flues to recover the high-temperature heat of the converter gas in the 1450℃~1800℃ to 800℃~1050℃ range. Then, water is sprayed to lower the converter gas temperature from 800℃~1050℃ to 200℃~300℃ to meet the inlet temperature requirements of the dust removal device. However, the medium-temperature heat in the 800℃~1050℃ to 200℃~300℃ range is consumed by water vaporization and is not effectively recovered, constituting a waste of heat.

[0004] Therefore, how to effectively recover the medium-temperature heat of converter gas is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a regenerative converter gas reforming device, the regenerative converter gas reforming device including a reforming furnace, the reforming furnace having a reforming zone, a heat storage zone, an ash collection zone, a converter gas inlet, a reaction gas inlet, a first reformed gas outlet, a reformed gas inlet and a second reformed gas outlet, the heat storage zone having a heat storage body, the reforming zone and the ash collection zone being located at opposite ends of the heat storage body;

[0006] The converter gas inlet and the reaction gas inlet are connected to the reforming zone. The second reforming gas outlet is connected to the reforming zone or to the area between the heat storage body and the reforming zone. The first reforming gas outlet is connected to the ash collection area or to the area between the heat storage body and the ash collection area. The reforming gas inlet is connected to the ash collection area or to the area between the heat storage body and the ash collection area. A plurality of gas channels are provided inside the heat storage body and / or between the heat storage body and the sidewall of the reforming zone. The reforming zone and the ash collection area are connected through the gas channels.

[0007] In one optional embodiment of a regenerative converter gas reforming device, the reforming zone is located above the regenerative zone along the direction of gravity, and the ash collection zone is located below the regenerative zone.

[0008] In one optional embodiment of a regenerative converter gas reforming device, the sidewalls of the reforming zone form an upper conical structure with an inner diameter that gradually increases from top to bottom. The upper port of the upper conical structure constitutes the converter gas inlet, and the reaction gas inlet is located on the sidewalls of the reforming zone. The sidewalls of the ash collection zone form a lower conical structure with an inner diameter that gradually decreases from top to bottom, and the lower port of the lower conical structure serves as the ash discharge port of the ash collection zone.

[0009] An optional embodiment of a regenerative converter gas reforming device includes an ash storage tank, which is connected to the ash discharge port of the ash collection area. The ash storage tank is provided with an air blowing port and an ash outlet, and the air blowing port is used to connect to an ash blowing gas source.

[0010] An optional embodiment of a regenerative converter gas reforming device is provided with a distributor and / or auxiliary electric heating equipment at the converter gas inlet.

[0011] This application also provides an ironmaking system, which includes a regenerative converter gas reforming device as described in any of the above claims, with at least two of the regenerative converter gas reforming devices connected in parallel; it also includes a blast furnace, a converter, a converter gas holder, a pressurizing device, and a soot blowing gas source, wherein the converter gas inlet is connected to the converter, the first reformed gas outlet is connected to the inlet of the converter gas holder, the reformed gas inlet is connected to the outlet of the converter gas holder, the pressurizing device is connected between the reformed gas inlet and the outlet of the converter gas holder, the second reformed gas outlet is connected to the blast furnace, and the soot blowing gas source is capable of blowing the converter gas ash collected in the ash collection area into the blast furnace.

[0012] In one alternative implementation of the ironmaking system, a vaporization cooling flue is connected between the converter and the converter gas inlet.

[0013] In one alternative embodiment of the ironmaking system, a mixed gas inlet pipeline and a mixing device are connected between the gas outlet of the converter gas holder and the reforming gas inlet. The mixing device is used to mix the reforming gas drawn from the converter gas holder and the mixed gas introduced by the mixed gas inlet pipeline.

[0014] This application also provides an iron smelting process, including the following steps:

[0015] Cool the converter gas at the converter outlet;

[0016] The cooled converter gas reacts with the introduced natural gas or coke oven gas under the action of the converter gas's own heat and the catalytic action of the iron oxides in the converter gas to produce reformed gas.

[0017] At least a portion of the generated reformed gas is released and dust is removed by the heat storage body, which stores heat and intercepts converter gas ash.

[0018] At least part of the reformed gas, after heat release and dust removal, is pressurized and then passes through a heat storage body to absorb heat, at which point the heat storage body releases heat.

[0019] The reformed gas, after absorbing heat, enters the blast furnace and serves as the blast furnace reducing gas.

[0020] At least a portion of the converter gas ash intercepted by the regenerator is blown into the blast furnace.

[0021] One implementation of the ironmaking process also includes the following steps: when the heat of the converter gas alone is insufficient to support the reforming reaction of the target amount of CO2, electric heating is performed to supplement the heat.

[0022] The regenerative converter gas reforming device provided in this application integrates reforming, heat storage, dust removal, and heat release functions, which facilitates the simplification of the ironmaking system structure and reduces its footprint. The ironmaking system and process provided in this application realize the recovery of medium-temperature waste heat from converter gas, as well as the recovery of iron and carbon elements from the converter gas. This reduces energy and solid fuel consumption and CO2 emissions in the ironmaking process, making it more energy-efficient and environmentally friendly. It utilizes the medium-temperature waste heat of the converter gas as the heat source for the reforming reaction in the carbon recovery process, and uses iron oxides in the converter gas as a catalyst for the reforming reaction in the carbon recovery process. By recovering iron elements from the converter gas ash, the content of iron oxides in the converter gas is increased to ensure the catalytic effect, thus achieving the coupling of the waste heat recovery process, the carbon recovery process, and the iron element recovery process. Attached Figure Description

[0023] Figure 1 A schematic diagram of the ironmaking system provided in this application;

[0024] Figure 2 for Figure 1Enlarged view of two parallel regenerative converter gas reforming units and their connected pipelines.

[0025] The annotations in the attached figures are explained as follows:

[0026] 1 Blast furnace, 2 Converter, 3 Gasification cooling flue, 4 Regenerative converter gas reforming unit, 41 Reformer, 411 Reforming zone, 412 Regenerative zone, 413 Ash collection zone, 414 Vertical pipe section, 415 Distributor, A Converter gas inlet, B Reactor gas inlet, C First reformed gas outlet, D Reformed gas inlet, E Second reformed gas outlet, 42 Ash storage tank, 5 Dust removal device, 6 Fan, 7 Silencing device, 8 Venting chimney, 9 Cooling device, 10 Converter gas holder, 11 External converter gas supply pipeline, 12 Coke oven gas inlet pipeline, 13 First mixer, 14 Pressurization device, 15 Natural gas inlet pipeline, 16 Second mixer, 17 Soot blowing gas source, 18 Converter gas ash spray gun, 19 Reformed gas spray gun. Detailed Implementation

[0027] This application provides a regenerative converter gas reforming device, an ironmaking system, and an ironmaking process. In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, the ironmaking system provided in this application includes a regenerative converter gas reforming unit 4. (As indicated...) Figure 2 As shown, the regenerative converter gas reforming unit 4 includes a reformer 41. The reformer 41 is provided with a reforming zone 411, a regenerative zone 412, an ash collection zone 413, a converter gas inlet A, a reaction gas inlet B, a first reformed gas outlet C, a reformed gas inlet D, and a second reformed gas outlet E.

[0029] The heat storage zone 412 contains a heat storage body, and several air passages are provided inside the heat storage body and / or between the heat storage body and the side wall of the heat storage zone 412. The reforming zone 411 and the ash collection zone 413 are located at opposite ends of the heat storage body and are connected by the aforementioned air passages.

[0030] Converter gas inlet A and reaction gas inlet B are connected to reforming zone 411.

[0031] The second reformer outlet E is connected to the reforming zone 411. Alternatively, the second reformer outlet E is connected to the area between the heat storage body and the reforming zone 411.

[0032] The first-stage rectifier outlet C is connected to the ash collection area 413. Alternatively, the first-stage rectifier outlet C is connected to the area between the heat storage body and the ash collection area 413.

[0033] The reformer gas inlet D is connected to the ash collection area 413. Alternatively, the reformer gas inlet D is connected to the area between the heat storage body and the ash collection area 413.

[0034] In the diagram, the ironmaking system is equipped with two regenerative converter gas reforming units 4. Alternatively, more than two regenerative converter gas reforming units 4 can be installed. The regenerative converter gas reforming units 4 are connected in parallel.

[0035] like Figure 1 As shown, the ironmaking system also includes a blast furnace 1, a converter 2, a converter gas holder 10, a pressurizing device 14, a soot blowing gas source 17, and a vaporization cooling flue 3.

[0036] In this regenerative converter gas reforming unit 4, the converter gas inlet A is connected to the converter 2, enabling the converter gas to be introduced into the reforming zone 411 of the regenerative converter gas reforming unit 4. The vaporization cooling flue 3 is connected between the converter gas inlet A of the regenerative converter gas reforming unit 4 and the converter 2, enabling the converter gas to be pre-cooled before entering the regenerative converter gas reforming unit 4.

[0037] The first reformed gas outlet C of the regenerative converter gas reforming unit 4 is connected to the gas inlet of the converter gas holder 10, which can lead the reformed gas after the reforming reaction into the converter gas holder 10. The gas outlet of the converter gas holder 10 is connected to an external converter gas supply pipeline 11.

[0038] The reforming gas inlet D of the regenerative converter gas reforming device 4 is connected to the gas outlet of the converter gas holder 10. The pressurizing device 14 is connected between the reforming gas inlet D of the regenerative converter gas reforming device 4 and the gas outlet of the converter gas holder 10. It can pressurize at least part of the reforming gas in the converter gas holder 10 and lead it into the regenerative converter gas reforming device 4 to absorb the heat storage of the heat storage body.

[0039] The second reforming gas outlet E of the regenerative converter gas reforming unit 4 is connected to the blast furnace 1, which can guide the reformed gas after absorbing heat from the regenerator into the blast furnace 1. To ensure that the reformed gas enters the blast furnace 1 evenly, a reforming gas lance 19 can be installed.

[0040] The soot blowing gas source 17 can blow the converter gas ash collected in the ash collection area 413 into the blast furnace 1. It should be noted that the pressurized reforming gas is returned to the blast furnace 1 after absorbing heat through the heat storage body. The return direction of the reforming gas is opposite to the direction of converter gas ash interception (that is, the flow direction of the converter gas when it releases heat through the heat storage body). Although the flow direction is opposite, it cannot send the converter gas ash previously intercepted by the heat storage body back to the blast furnace 1. In other words, it is impossible to send the converter gas ash intercepted by the heat storage body back to the blast furnace 1 by relying on the return of the reforming gas. Therefore, it is necessary to set up an additional soot blowing gas source 17.

[0041] like Figure 1As shown, the ironmaking process provided in this application includes the following steps:

[0042] The converter gas at the outlet of converter 2 is pre-cooled. For example, when the temperature of the converter gas at the outlet of converter 2 is 1450℃~1800℃, it can be pre-cooled to 800℃-1050℃ using vaporization cooling flue 3, thereby recovering the high-temperature heat of the converter gas. For example, the composition of the cooled converter gas is shown in the table below:

[0043]

[0044] Pre-cooling can also transform the molten converter gas ash in the converter gas into a non-molten state, so that it can be effectively intercepted when passing through the heat storage body, thus achieving dust removal.

[0045] The cooled converter gas reacts with the introduced natural gas or coke oven gas under the heat of the converter gas itself (and, if necessary, pressurized by an auxiliary electric pressurization device to ensure reforming reaction conditions) and the catalytic action of the iron oxides inherent in the converter gas to produce reformed gas. The specific reaction equation is: CH4 + CO2 = CO + 2H2. The reforming reaction is endothermic. The temperature of the introduced natural gas or coke oven gas is approximately 25℃-35℃. Typical coke oven gas or natural gas compositions are shown in the table below.

[0046]

[0047] The composition of the reformed gas is shown in the table below:

[0048]

[0049] At least a portion of the generated reformed gas undergoes heat release and dust removal through a heat storage medium. During this process, the heat storage medium operates in heat storage mode and intercepts converter gas ash to achieve dust removal. For example, after the reforming reaction and heat storage in the heat storage medium, the temperature of the converter gas further decreases from 800℃-1050℃ to 200℃-300℃. After interception by the heat storage medium, the dust concentration decreases from 80~150 g / Nm³. 3 Reduced to 40~55g / Nm 3 .

[0050] After heat release and dust removal, at least a portion of the reformed gas is pressurized and then passes through a heat storage medium to absorb heat, at which point the heat storage medium is in heat release mode. This achieves the recovery of the medium-temperature heat (800℃-1050℃ to 200℃-300℃) of the converter gas. Specifically, at least a portion of the reformed gas after heat release and dust removal can be pre-mixed with some natural gas and / or coke oven gas before passing through the heat storage medium. After mixing with natural gas and / or coke oven gas, the temperature is approximately 20℃-50℃, and after heat absorption, the temperature is approximately 600℃-900℃.

[0051] After absorbing heat, the reformed gas enters blast furnace 1 as its reducing gas. This achieves carbon recovery from converter gas ash and also reduces CO2 emissions.

[0052] At least a portion of the removed converter gas ash is blown into blast furnace 1. For example, nitrogen can be introduced to blow the converter gas ash. This achieves the recovery of iron from the converter gas ash and increases the iron oxide content in the converter gas, thereby ensuring effective catalysis of the reforming reaction and guaranteeing its smooth progress. The recovery rate of converter gas ash can reach 5 kg to 10 kg / t of steel.

[0053] At least two heat storage bodies alternately store and release heat. That is, when at least one of the heat storage bodies of two or more regenerative converter gas reforming units 4 is in heat storage mode, at least the heat storage body of the other is in heat release mode, so as to ensure continuous production.

[0054] The regenerative converter gas reforming device 4 provided in this application integrates reforming, heat storage, dust removal, and heat release functions, which facilitates the simplification of the ironmaking system structure and reduces its footprint. The ironmaking system and process provided in this application realize the recovery of medium-temperature waste heat from converter gas, as well as the recovery of iron and carbon elements from the converter gas. This reduces energy consumption (approximately 6 kg ce / t steel), solid fuel consumption, and CO2 emissions in the ironmaking process, making it more energy-efficient and environmentally friendly. It utilizes the medium-temperature waste heat of the converter gas as the heat source for the reforming reaction in the carbon recovery process, and uses iron oxides in the converter gas as a catalyst for the reforming reaction in the carbon recovery process. By recovering iron elements from the converter gas ash, the content of iron oxides in the converter gas is increased to ensure the catalytic effect, thus achieving the coupling of the waste heat recovery process, the carbon recovery process, and the iron element recovery process.

[0055] In some related technologies, neither vaporization cooling flues nor reforming reactions are implemented. Instead, the heat storage body is used entirely to recover the waste heat of the converter gas. However, the heat storage capacity of the heat storage body is limited, and it can only recover the high-temperature heat of the converter gas, not the medium-temperature heat. Moreover, the heat storage body is easily damaged due to the high temperature of the converter gas. Furthermore, when the converter gas flows through the heat storage body, the converter gas ash is in a molten state and cannot be intercepted by the heat storage body. This prevents the heat storage body from playing a dust removal role, resulting in the inability to recover the converter gas ash intercepted by the heat storage body to blast furnace 1. Consequently, the recovery of iron elements cannot be achieved, resulting in a low iron oxide content in the converter gas ash, which cannot effectively catalyze the reforming reaction. In comparison, this application utilizes the vaporization cooling flue 3 to recover the high-temperature heat of the converter gas in advance, reducing the probability of high-temperature damage to the heat storage body. At the same time, it makes the converter gas ash in the converter gas into a non-molten state that can be intercepted. By utilizing the reforming reaction and the heat storage body to recover the medium-temperature heat of the converter gas, a more comprehensive waste heat recovery of the converter gas is achieved. By using the heat storage body to intercept and recover the converter gas ash, the content of iron oxides in the converter gas is increased, ensuring the catalytic effect of iron oxides in the converter gas on the reforming reaction.

[0056] In some related technologies, converter gas, after being cooled and dust-removed to meet standards, enters the converter gas holder. A portion of the converter gas is pressurized and drawn from the converter gas holder to the reforming unit. In the reforming unit, this portion of converter gas undergoes a reforming reaction with natural gas or coke oven gas, using blast furnace gas and preheated air as heat sources and Ni-based anti-carbon deposition materials as catalysts. The reformed gas is then fed into the blast furnace as blast furnace reducing gas, thereby achieving carbon recovery from the converter gas. This carbon recovery process is independent of the converter gas waste heat recovery process and is not coupled. Furthermore, the converter gas drawn from the converter gas holder is at a very low temperature (around 50°C), insufficient to meet the heat requirements of the reforming reaction, preventing the recovery of medium-temperature heat from the converter gas. It also cannot quickly reach a high temperature during the reforming reaction. Additionally, the high pressure inside the converter gas holder (around 0.3 MPa) necessitates pressurization (usually to 0.6-0.8 MPa) to draw the converter gas out, resulting in a high-pressure state during the reforming reaction. Since reforming reactions require high temperature and low pressure for high efficiency, the reforming reaction efficiency is low, leading to low carbon recovery efficiency. Moreover, the converter gas exiting the converter gas holder is essentially free of converter gas ash, so the reforming unit cannot integrate converter gas ash interception functionality. Furthermore, the iron oxides in the converter gas ash do not act as a catalyst during the reforming reaction, requiring an additional catalyst. In contrast, this application causes the reforming reaction to occur before the converter gas enters the converter gas holder 10. This ensures that the converter gas is in a high-temperature, low-pressure state when it enters the reforming unit, thereby guaranteeing the efficiency of the reforming reaction. Moreover, the heat of the converter gas itself can be used as a heat source to recover part of the medium-temperature heat of the converter gas through the reforming reaction, achieving the coupling of carbon recovery and waste heat recovery. Furthermore, the converter gas contains a large amount of converter gas ash when it enters the reforming unit, so the reforming unit can integrate the converter gas ash interception function. It can also utilize the iron oxides in the converter gas ash to catalyze the reforming reaction, achieving the coupling of the carbon recovery process and the iron element recovery process.

[0057] In some alternative embodiments, such as Figure 1 As shown, along the direction of gravity, the reforming zone 411 is located above the heat storage zone 412, and the ash collection zone 413 is located below the heat storage zone 412. In this way, the converter gas ash intercepted by the heat storage body can accumulate in the ash collection zone 413 by gravity.

[0058] In some alternative embodiments, such as Figure 1As shown, the sidewalls of the reforming zone 411 form an upper conical structure with an inner diameter that gradually increases from top to bottom. The upper end of the upper conical structure constitutes the converter gas inlet A. The reactant gas inlet B is located on the sidewall of the reforming zone 411, and preferably tangential to the sidewall so that the reactant gas enters the reforming zone 411 in a direction tangential to the sidewall. During operation, the converter gas enters the reforming zone 411 from the top downwards, and the reactant gas (coke oven gas or natural gas) enters the reforming zone 411 from one side. The entry directions of the converter gas and the reactant gas form a certain angle, and the airflow easily generates a swirling effect along the inner surface of the upper conical structure. This facilitates the full mixing and contact of the converter gas and the reactant gas, thereby improving the reforming reaction efficiency.

[0059] In some alternative embodiments, such as Figure 1 As shown, the sidewalls of the ash collection zone 413 form a lower conical structure with an inner diameter that gradually decreases from top to bottom. The lower end of the lower conical structure serves as the ash discharge port, allowing the converter gas ash accumulated in the ash collection zone 413 to be discharged from the ash discharge port by its own gravity. In the figure, the sidewalls of the heat storage zone 412 form a cylindrical structure. The diameter of the upper end of the cylindrical structure is approximately the same as the diameter of the lower end of the upper conical structure, and the diameter of the lower end of the cylindrical structure is approximately the same as the diameter of the upper end of the lower conical structure.

[0060] In some alternative embodiments, such as Figure 1 As shown, a vertical pipe section 414 is installed at the upper end of the reforming zone 411. The lower end of the vertical pipe section 414 is connected to the converter gas inlet A. The inner diameter of the vertical pipe section 414 is equal to or smaller than the diameter of the converter gas inlet A. The vertical pipe section 414 is connected to the converter gas inlet pipeline. The converter gas first enters the vertical pipe section 414 from the converter gas inlet pipeline, and then enters the reforming zone 411 from the vertical pipe section 414 through the converter gas inlet A. The vertical pipe section 414 serves to guide and collect the flow, causing the converter gas to flow vertically towards the converter gas inlet A.

[0061] In some optional embodiments, a distributor 415 is provided at the converter gas inlet A. The distributor 415 includes a guide cone and a guide plate. The diameter of the guide cone gradually decreases along the flow direction of the converter gas. The guide plate is provided with a number of guide holes, so that the converter gas is evenly distributed at various positions on the horizontal cross section of the reforming zone 411 under the diversion of the inner hole of the guide cone and the guiding effect of the guide holes of the guide plate. This is more conducive to the full mixing and contact of the converter gas and the reaction gas, thereby improving the reforming reaction efficiency.

[0062] In some optional embodiments, an auxiliary electric heating device is installed at converter gas inlet A. In this way, when the heat of the converter gas itself is insufficient to support the target amount of CO2 reforming reaction, the auxiliary electric heating device can be turned on and adjusted to an appropriate power to supplement the heat.

[0063] In some alternative embodiments, such as Figure 2 As shown, the ironmaking system includes an ash storage tank 42, which is used to hold converter gas ash collected in the ash collection area 413. The ash storage tank 42 is equipped with an air blowing port and an ash outlet. The air blowing port is connected to the soot blowing gas source 17. The ash outlet is connected to the blast furnace 1, so that the converter gas ash can enter the blast furnace 1 through the ash outlet under the blowing action of the soot blowing gas source 17. To ensure that the converter gas ash enters the blast furnace 1 evenly, a converter gas ash spray gun 18 can be installed. In the figure, in addition to being connected to the air blowing port of the ash storage tank 42 through a branch, the soot blowing gas source 17 is also connected to the connecting pipeline between the ash outlet of the ash storage tank 42 and the converter gas ash spray gun through another branch, thus ensuring the blowing effect.

[0064] In some optional embodiments, a dust removal device 5, a fan 6, a silencer 7, a venting chimney 8, and a cooling device 9 are connected between the first reformed gas outlet C and the inlet of the converter gas holder 10. The dust removal device 5 is preferably an electrostatic precipitator. After dust removal by the dust removal device, the dust concentration of the converter gas is approximately 10 mg / Nm³. 3 After being cooled by the cooling device 9, the temperature is approximately 50℃, which meets the gas intake requirements of the converter gas holder 10.

[0065] In some optional embodiments, a reactant gas inlet pipe and a mixing device are connected between the gas outlet of the converter gas holder 10 and the reforming gas inlet D. The mixing device is used to mix the reforming gas drawn from the converter gas holder 10 and the reactant gas drawn from the reactant gas inlet pipe. In the figure, a coke oven gas inlet pipe 12 and a natural gas inlet pipe 15 are respectively provided, and a first mixing device 13 for mixing coke oven gas and reforming gas and a second mixing device 16 for mixing natural gas and reforming gas are respectively provided.

[0066] The above-described optional embodiments can be freely combined without conflict.

[0067] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A regenerative converter gas reforming device, characterized in that, The regenerative converter gas reforming device (4) includes a reformer (41), which is provided with a reforming zone (411), a heat storage zone (412), an ash collection zone (413), a converter gas inlet (A), a reaction gas inlet (B), a first reformed gas outlet (C), a reformed gas inlet (D), and a second reformed gas outlet (E). The heat storage zone (412) is provided with a heat storage body. The reforming zone (411) and the ash collection zone (413) are located at opposite ends of the heat storage body. The converter gas inlet (A) and the reaction gas inlet (B) are connected to the reforming zone (411). The second reforming gas outlet (E) is connected to the reforming zone (411) or to the area between the heat storage body and the reforming zone (411). The first reforming gas outlet (C) is connected to the ash collection area (413) or to the area between the heat storage body and the ash collection area (413). The reforming gas inlet (D) is connected to the ash collection area (413) or to the area between the heat storage body and the ash collection area (413). A plurality of gas channels are provided inside the heat storage body and / or between the heat storage body and the side wall of the reforming zone (411). The reforming zone (411) and the ash collection area (413) are connected through the gas channels.

2. The regenerative converter gas reforming device according to claim 1, characterized in that, Along the direction of gravity, the reforming zone (411) is located above the heat storage zone (412), and the ash collection zone (413) is located below the heat storage zone (412).

3. The regenerative converter gas reforming device according to claim 2, characterized in that, The sidewalls of the reforming zone (411) form an upper conical structure with an inner diameter that gradually increases from top to bottom. The upper port of the upper conical structure constitutes the converter gas inlet (A), and the reaction gas inlet (B) is located on the sidewalls of the reforming zone (411). The sidewalls of the ash collection zone (413) form a lower conical structure with an inner diameter that gradually decreases from top to bottom. The lower port of the lower conical structure serves as the ash discharge port of the ash collection zone (413).

4. The regenerative converter gas reforming device according to any one of claims 1-3, characterized in that, The regenerative converter gas reforming device (4) includes an ash storage tank (42), which is connected to the ash discharge port of the ash collection area (413). The ash storage tank (42) is provided with an air blowing port and an ash discharge port. The air blowing port is used to connect to the ash blowing gas source (17).

5. The regenerative converter gas reforming device according to any one of claims 1-3, characterized in that, A gas distributor and / or auxiliary electric heating facilities are provided at the converter gas inlet (A).

6. An iron smelting system, characterized in that, The ironmaking system includes a regenerative converter gas reforming device (4) as described in any one of claims 1-5, with at least two regenerative converter gas reforming devices (4) connected in parallel; it also includes a blast furnace (1), a converter (2), a converter gas holder (10), a pressurizing device (14), and a soot blowing gas source (17). The converter gas inlet (A) is connected to the converter (2), the first reforming gas outlet (C) is connected to the inlet of the converter gas holder (10), the reforming gas inlet (D) is connected to the outlet of the converter gas holder (10), the pressurizing device (14) is connected between the reforming gas inlet (D) and the outlet of the converter gas holder (10), the second reforming gas outlet (E) is connected to the blast furnace (1), and the soot blowing gas source (17) can blow the converter gas ash collected in the ash collection area (413) into the blast furnace (1).

7. The ironmaking system according to claim 6, characterized in that, A vaporization cooling flue (3) connects the converter (2) and the converter gas inlet (A).

8. The ironmaking system according to claim 6 or 7, characterized in that, A mixed gas inlet pipe and a mixing device are connected between the gas outlet of the converter gas holder (10) and the reforming gas inlet (D). The mixing device is used to mix the reforming gas drawn from the converter gas holder (10) and the mixed gas introduced by the mixed gas inlet pipe.

9. An ironmaking process, implemented based on the ironmaking system according to any one of claims 6-8, characterized in that, Includes the following steps: Cool the converter gas at the outlet of converter (2); The cooled converter gas reacts with the introduced natural gas or coke oven gas under the action of the converter gas's own heat and the catalytic action of the iron oxides in the converter gas to produce reformed gas. At least a portion of the generated reformed gas is released and dust is removed by the heat storage body, which stores heat and intercepts converter gas ash. At least part of the reformed gas, after heat release and dust removal, is pressurized and then passes through a heat storage body to absorb heat, at which point the heat storage body releases heat. The reformed gas after heat absorption enters the blast furnace (1) and serves as the reducing gas for the blast furnace (1); At least a portion of the converter gas ash intercepted by the regenerator is blown into the blast furnace (1).

10. The ironmaking process according to claim 9, characterized in that, It also includes the following steps: When the heat from the converter gas alone is insufficient to support the target amount of CO2 undergoing a reforming reaction, electric heating is used to supplement the heat.

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