Method for injecting decarbonized gas and coke oven gas using a hydrogen reduction-enhanced oxygen blast furnace.

Abstract

This invention discloses a method for injecting decarbonized gas and coke oven gas into a hydrogen reduction-enhanced oxygen blast furnace. This invention modifies the mixing and addition method, upgrading the coke oven gas addition from the low-temperature stage to the high-temperature stage. The coke oven gas is improved and optimized using conventional technology, and is used as a mixed gas after heating the decarbonized gas in the hydrogen reduction-enhanced oxygen blast furnace without using a gas heating furnace. This allows the hydrogen reduction gas to be injected into the furnace at a higher temperature without using a gas heating furnace, thereby contributing to the reduction process. Furthermore, it avoids the problem of hydrogen reduction gas H2 in the coke oven gas reacting with SiO2 in the resistant material after using a gas heating furnace, which decomposes the performance of the resistant material.

Description

[Technical Field]

[0001] This invention relates to gas injection technology for low-carbon blast furnaces, and more specifically to a method for injecting decarbonized gas and coke oven gas using a hydrogen-reduced and enhanced oxygen blast furnace. [Background technology]

[0002] A hydrogen reduction-enhanced oxygen blast furnace (HyCROF) uses oxygen blowing instead of conventional heated air blowing to remove CO2 from the furnace top gas, forming a gas medium with high concentrations of reducing components (CO and H2). Natural gas and coke oven gas containing reducing gases CH4 and H2 are mixed and added, heated, and then circulated and blown into the tuyeres of the hydrogen reduction-enhanced oxygen blast furnace (HyCROF). This is a steelmaking process that utilizes the reduction of solid fuel by reducing carbon dioxide emissions. The injection of decarbonized circulating gas and coke oven gas is central to the technology of the Hydrogen-Reduced Enhanced Oxygen Blast Furnace (HyCROF). When heating and injecting coke oven gas in a gas heating furnace, the refractory bricks in the high-temperature region of the dome of the Hydrogen-Reduced Enhanced Oxygen Blast Furnace (HyCROF) use silicon bricks with an SiO2 content of 90-95%. Because silicon bricks contain a large amount of SiO2, the reaction SiO2 + H2 = SiO(g)↑ + H2O occurs at high temperatures, leading to weight loss and strength decay problems over long-term use. This significantly affects the stability and safety of the silicon bricks in the high-temperature region of the dome. For specific flow details, please refer to the flow of injection of decarbonized gas and coke oven gas in Figure 1. [Overview of the Initiative] [Problems that the invention aims to solve]

[0003] The object of the present invention is to provide a method for injecting decarbonized gas and coke oven gas into a hydrogen-reduced enhanced oxygen blast furnace that can stably control the gas temperature injected into the furnace, stabilize the injected gas temperature and components, reduce CO2 emissions by 18% or more, and reduce solid fuel consumption by 30% or more. [Means for solving the problem]

[0004] This invention relates to a method for injecting decarbonized gas and coke oven gas using a hydrogen reduction-enhanced oxygen blast furnace, and the implementation steps are as follows.

[0005] This method relies on a hydrogen reduction-enhanced oxygen blast furnace as the primary means of adjusting its gas injection temperature and the composition of the injected gas. The hydrogen reduction-enhanced oxygen blast furnace is a metallurgical device, and the fuel structure of the furnace material mainly consists of solid fuel and gaseous fuel. The solid fuel mainly consists of coke and injected coal, and the gaseous fuel mainly consists of decarbonized gas of CO and H2, which has reducing properties due to the removal of CO2 and H2S from the gas at the top of the furnace, and coke oven gas. The ore beneficiation structure of the furnace material mainly uses basic ore, acidic ore, and natural lump ore.

[0006] The fuel consumption of the aforementioned furnace material is 250-280 kg / tHM for solid fuel coke, 40-80 kg / tHM for blown coal, and the amount of blown-in decarbonized gas circulated for gaseous fuel is 450-750 Nm³. 3 The ratio is / tHM, and the coke oven gas injection consumption is 50-150Nm³. 3 It's / tHM.

[0007] The decarbonized gas described in this method is heated in a gas heating furnace, and coke oven gas is added to the outlet of the gas heating furnace in a mixture. The temperature of the medium after mixing is 1100-1250°C, and the volume fractions of its main components are CO: 55-60%, H2: 12-25%, N2: 3-5%, CO2: 0-3%, and CH4: 8-10%. The high-temperature gas obtained by mixing coke oven gas with the decarbonized gas in this step is blown into the furnace tube by a combined blowing device, and the pressure of the decarbonized gas is controlled to 0.35-0.4 MPa.

[0008] The decarbonized gas described in this method is heated by a gas heating furnace, and the outlet of the gas heating furnace has the function of introducing a 40°C mixed cold decarbonized gas and coke oven gas into the gas heating furnace, both individually and mixed before being added to the furnace.

[0009] Furthermore, adding room-temperature coke oven gas (COG) from the hot gas piping after the gas heating furnace is a functional improvement method that solves the problem of weight loss and strength reduction that occurs when coke oven gas enters the high-temperature region of the dome of the gas heating furnace, causing the H2 in the coke oven gas to react with SiO2 at high temperatures. For example, assuming an injection temperature of 1200°C, the temperature at which room-temperature coke oven gas and decarbonized gas are mixed and added is 40°C, and the average specific heat capacity is 1.371 kJ / Nm³ 3 The temperature is 0°C, the coke oven gas is 25°C, and the average specific heat capacity is 1.369 kJ / Nm³. 3 If the temperature is 0°C, and room temperature coke oven gas is mixed and added to the decarbonized gas, and the temperature at which the mixed medium is blown in needs to reach an injection temperature of 1200°C, then the flow rate of the decarbonized gas is 20000 Nm³. 3 / h to 190000Nm 3 The flow rate of coke oven gas increased to 1000 Nm³ / h, and the amount of heat required to heat the temperature from 40°C to 1200°C increased from 30.3 GJ to 288 GJ. 3 / h to 14600Nm 3 When the rate is increased to / h, the amount of heat required to heat the temperature from 25°C to 1200°C increases from 1.6 GJ to 23.5 GJ, the total amount of heat added by mixing ambient coke oven gas and decarbonized gas increases from 31.9 GJ to 311.5 GJ, and in order to maintain the injection temperature of the mixed medium at 1200°C after mixing, the actual outlet temperature of the gas heating furnace increases from 1261.7°C to 1294.8°C. The calculation model for the specific adjustment parameters is shown in the table below.

[0010] [Table 1]

[0011] The specific method of mixing and adding coke oven gas (COG) is realized by the device for mixing and adding coke oven gas. Taking the injection temperature of 1200°C as an example, it mainly includes a coke oven gas flow rate adjustment device, pressure detection, flow rate detection, temperature detection, flow rate cut-off device, outlet temperature, pressure, and flow rate detection of the gas heating furnace, temperature detection after mixing and adding, and a safety protection device. The specific process flow and operation method are as follows. The top gas of the hydrogen reduction enhanced oxygen blast furnace is pressurized to 0.45 - 1.6 MPa by a dust removal, dehydration device, and a compressor, then enters a decarbonization device to remove CO2, forming a gas medium with a reducing component (CO and H2) volume fraction of 65 - 85%. After detecting the pressure, temperature, and flow rate, it enters a gas heating furnace and is heated to 1200°C or above, and then is injected into the lower furnace barrel of the hydrogen reduction enhanced oxygen blast furnace using a composite injection device.

[0012] Furthermore, to maintain the stability of the injection gas temperature, the temperature fluctuation is ±5 - 10°C. Before entering the gas heating furnace, 40°C mixed cold decarbonized gas is introduced, mixed into the hot gas piping system after heating, and the temperature of the gas injected into the furnace is stabilized at 1200°C.

[0013] Furthermore, to improve the reducing components (CO and H2) in the injection gas, CH4 with a volume fraction of 22 - 24% in the coke oven gas can be decomposed or cracked into CO and H2, and it has a CO + H2 with a volume fraction of 55 - 60%. Moreover, maintaining the stability of the injection gas temperature, the temperature fluctuation is ±5 - 10°C. The optimized coke oven gas is mixed into the hot gas piping system after heating, and the temperature of the gas injected into the furnace is stabilized at 1200°C. The pressure of the coke oven gas is 50 - 100 kPa higher than the hot decarbonized gas pressure.

[0014] Preferably, the flow rate of the coke oven gas is controlled to be 1000 - 14600 Nm 3 / h, and the flow rate adjustment device for introducing 40°C mixed cold decarbonized coal before entering the gas heating furnace is adjusted to stabilize the temperature of the gas injected into the furnace at 1200°C.

[0015] Preferably, the flow rate adjusting device is adjusted so that the mixing flow rate of the coke oven gas is 1000 to 14600 Nm 3 / h, and when the mixing flow rate for adjusting the coke oven gas reaches 14600 Nm 3 / h, the temperature blown into the furnace is higher than 1200 °C, and the flow rate adjusting device for introducing 40 °C mixed cold decarburized gas before entering the gas heating furnace is adjusted to stabilize the temperature blown into the furnace at 1200 °C.

[0016] Furthermore, as related requirements for mixing addition, the pressure of the coke oven gas is 30 to 40 kPa lower than the pressure of the hot decarburized gas, there are two automatically closing flow cutoff devices to cut off the mixing addition, and the safety protection device injects N2 between the flow cutoff devices while shutting off the natural gas source and the coke oven gas source.

[0017] The raw materials and coke of the hydrogen reduction enhanced oxygen blast furnace are weighed by an adding device, the raw fuels for the lot iron production amount, the theoretical coke ratio, and the slag basicity are calculated, and the ore dressing mass fraction of the raw materials includes 40 to 55% basic ore, 40 to 50% acidic ore, 5 to 10% natural lump ore, and 250 to 280 kg / tHM coke.

[0018] The basic ore, acidic ore, natural lump ore, and coke as raw fuels are added hierarchically from the adding device at the top of the furnace, the blown coal, decarburized gas, and coke oven gas are blown into the furnace cylinder by a composite blowing device at the lower part of the furnace cylinder, and the composite blowing device further includes industrial oxygen blown into the furnace cylinder, and the oxygen content of the oxygen is normal temperature cold oxygen of 90 to 99.9%, and the oxygen amount is controlled at 160 to 230 Nm 3 / tHM, and the hydrogen reduction enhanced oxygen blast furnace finally obtains qualified hot metal, by-product gas, and slag.

Advantages of the Invention

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0020] 1. When heating and injecting coke oven gas in a gas heating furnace, SiO2 in the refractory bricks in the high-temperature area of the dome of the gas heating furnace of a hydrogen reduction enhanced oxygen blast furnace (HyCROF) reacts with H2 in the coke oven gas and natural gas. When used for a long time, there are problems of weight loss and strength attenuation, which greatly affects the use stability and safety of silicon bricks in the high-temperature area of the dome. The present invention prevents this.

[0021] 2. The present invention can stably control the temperature of the gas injected into the hydrogen reduction enhanced oxygen blast furnace, stabilize the temperature and components of the injected gas, reduce the CO2 emission by more than 18%, and reduce the solid fuel consumption by more than 30%, and has a certain greenhouse gas emission reduction effect.

[0022] 3. The present invention changes the mixing addition method, upgrades the addition of coke oven gas from the low-temperature stage of the gas to the high-temperature stage. Since the gas has the characteristics of combustion, explosion, and poisoning, the addition in the low-temperature stage does not need to consider the impact on the essential safety of its characteristics. However, this technology adds from the high-temperature stage and needs to study and design the relevance between combustion, explosion, poisoning and essential safety production. Therefore, this technology designs high-temperature chain pressure protection, nitrogen safety protection, and accident high-speed cut-off on the hardware, and develops models for component, flow rate, and heat calculation on the software, and has a certain degree of creativity and innovation.

Brief Description of the Drawings

[0023] [Figure 1] It is a flowchart of the process before optimization of the present invention. [Figure 2] It is a flowchart of the process after optimization of the present invention.

Modes for Carrying Out the Invention

[0024] To further understand the present invention, the preferred embodiments of the present invention will be described below with reference to examples. However, it should be understood that these descriptions are for further explaining the features and advantages of the present invention and do not limit the scope of the claims of the present invention.

[0025] In the example, referring to Figure 2 in conjunction with Figure 1, a method for injecting decarbonized gas and coke oven gas into a hydrogen-reducing enhanced oxygen blast furnace is described. The top gas of the hydrogen-reducing enhanced oxygen blast furnace 1 is pressurized to 0.45 to 1.6 MPa by a dust removal and dewatering device 30 and a top gas pressurizer 9, then enters a decarbonization device 10 to remove CO2 and form a gas medium of reducing components (CO and H2) with a volume fraction of 65 to 85%. The cold decarbonized gas entering the heating furnace is detected by a cold decarbonized gas temperature detection 18, a cold decarbonized gas pressure detection 19, and a cold decarbonized gas flow rate detection 20, and then enters a gas heating furnace 11 where it is heated to 1200°C or higher. After being injected into the lower furnace tube of the hydrogen-reducing enhanced oxygen blast furnace 1 by a combined injection device 28, the replenishment of reducing agent and heat in the furnace is completed.

[0026] The present invention aims to optimize the gas heating furnace 11, as shown in Figure 1, to solve the problem of weight loss and strength decay that occurs when coke oven gas is heated and blown into the dome of a hydrogen reduction-enhanced oxygen blast furnace (HyCROF), due to the reaction of SiO2 in the refractory bricks in the high-temperature region of the dome with H2 in the coke oven gas when the coke oven gas is heated and blown into the gas heating furnace, which significantly affects the stability and safety of the silicon bricks in the high-temperature region of the dome when used over a long period of time. Referring to Figure 2, the gas heating furnace 11, which has a constant heat transfer rate after heating is completed, has a hot decarbonized gas temperature that is much higher than the blown-in temperature, for example, 1200°C, in the initial stages of heating of the cold decarbonized gas entering the heating furnace by the gas heating furnace 11, and the temperature fluctuation is ±5~10°C in order to maintain the stability of the blown gas temperature. In order to improve the reducing components (CO and H2) in the blown gas, CH4, which has a volume fraction of 22~24% in the coke oven gas, can be decomposed or fission-decomposed into CO and H2. Furthermore, it has a volume fraction of 55-60% CO+H2, maintains stability in the blown-in gas temperature, with temperature fluctuations of ±5-10°C, and is mixed into the heated hot gas piping system after the coke oven gas is heated and added, stabilizing the temperature blown into the oven at 1200°C. Using the flow rate and pressure output of the coke oven gas source 2, the flow shut-off device 3 for the first coke oven gas and the flow shut-off device 8 for the second coke oven gas are opened, the coke oven gas flow rate adjustment device 7 is adjusted, and the mixing flow rate of the coke oven gas flow rate detector 6 is set to 1000-14600 Nm 3 The system is set to / h, the coke oven gas pressure detection 5 is set to be 50-100kPa higher than the pressure of the hot decarbonization gas pressure detection 25, the coke oven gas temperature detection 4 is set to be heated from room temperature 25°C to the temperature measured by the hot mixed medium temperature detection 27 (1200°C), and the total flow rate entering the oven can be calculated by adding the hot decarbonization gas flow rate detection 26 and the coke oven gas flow rate detection 6.

[0027] The coke oven gas flow rate detector 6 adjusts the coke oven gas flow rate adjustment device 7 and detects a flow rate of 14,600 Nm. 3Once the maximum flow rate ( / h) is reached, the temperature of the gas injected into the furnace will still be higher than 1200°C. The flow cutoff devices 12 for the first cold decarbonized gas and 17 for the second cold decarbonized gas will be opened, and the flow control device 16 that introduces 40°C mixed cold decarbonized gas before it enters the gas heating furnace will be adjusted to bring the temperature measured by the hot mixed medium temperature detector 27 to 1200°C, thereby stabilizing the temperature injected into the furnace at 1200°C. The total flow rate entering the furnace is calculated based on the sum of the hot decarbonized gas flow rate detector 26, the coke oven gas flow rate detector 6, and the cooling decarbonized gas flow rate detector 15.

[0028] As a related requirement for mixing and adding, the pressure of the coke oven gas must be 30-40 kPa lower than the pressure of the hot decarbonized gas, and there are two automatically closing flow shutoff devices to shut off the mixing and adding process, and the safety protection device simultaneously shuts off the coke oven gas source and injects N2 between the flow shutoff devices, specifically including 21-N2 gas source device, 22-N2 first shutoff device, and 23-N2 second shutoff device.

[0029] The raw materials and coke for the hydrogen reduction-enhanced oxygen blast furnace of the present invention are weighed using the addition device 29, and the raw fuel is calculated based on the lot iron production volume, theoretical coke ratio, and slag basicity. The ore-dressing mass fraction of the raw materials is 40-55% basic ore, 40-50% acidic ore, 5-10% natural lump ore, and 250-280 kg / tHM of coke.

[0030] The raw fuels, including basic ore, acidic ore, natural lump ore, and coke, are added in a hierarchical manner from the addition device 29 at the top of the furnace. The blown coal 32, decarbonized gas, coke oven gas, and natural gas are blown into the furnace tube by a combined blowing device at the bottom of the furnace tube. The combined blowing device also injects industrial oxygen supplied from an oxygen source 31, which is room temperature cold oxygen with an oxygen content of 90-99.9% and an oxygen content of 160-230 Nm³. 3 By controlling the temperature to / tHM and implementing a method of introducing furnace materials and heating and blowing in multiple media, physicochemical reactions are generated within the furnace, ultimately yielding acceptable molten iron, by-product gases, and slag, while also reducing solid fuel consumption and greenhouse gas CO2 emissions. [Explanation of symbols]

[0031] 1. Hydrogen-reduced enhanced oxygen blast furnace, 2. Coke oven gas source, 3. Flow cutoff device for the first coke oven gas, 4. Coke oven gas temperature detection device, 5. Coke oven gas pressure detection device, 6. Coke oven gas flow rate detection device, 7. Coke oven gas flow rate adjustment device, 8. Flow shutoff device for the second coke oven gas. 9. Top gas pressurizer, 10-Decarbonization equipment, 11-Gas heating furnace, 12-First cold decarbonization gas flow cutoff device, 13. Cold decarbonization gas temperature detection device, 14. Cold decarbonization gas pressure detection device, 15. Cold decarbonization gas flow rate detection device, 16. Cold decarbonization gas flow rate control device, 17. Flow cutoff device for the second cold decarbonization gas, 18. Cold decarbonization gas temperature detection device entering the heating furnace. 19. Cold decarbonization gas pressure detection device for entering a heating furnace. 20. Cold decarbonization gas flow rate detection device entering the heating furnace. 21-N2 air source device, 22-N2 First circuit breaker, 23-N2 Second circuit breaker, 24. Hot decarbonization gas temperature detection device, 25. Hot decarbonization gas pressure detection device, 26. Hot decarbonization gas flow rate detection device, 27. Hot Mixing Medium Temperature Detection Device, 28-Combined blowing device, 29. Top-furnace fuel addition device (used for adding basic ores, acidic ores, natural lump ores and coke), 30-Dust removal, dehydration equipment, 31. Oxygen source device, 32. Coal blowing device.

Claims

[Claim 1] A method for injecting decarbonized gas and coke oven gas into a hydrogen-reduced and enhanced oxygen blast furnace, wherein the apparatus used in the method includes a coke oven gas flow rate adjustment device, a pressure detection device, a flow rate detection device, a temperature detection device, a flow rate shutoff device, a gas heating furnace outlet temperature, pressure, and flow rate detection device, a temperature detection device after mixing, and a safety protection device. The implementation steps are as follows: 1) The method is used in the operation of a hydrogen reduction-enhanced oxygen blast furnace to adjust the gas injection temperature and the components of the injected gas, wherein the hydrogen reduction-enhanced oxygen blast furnace is a metallurgical device, the fuel structure of the furnace material includes solid fuel and gaseous fuel, the solid fuel includes coke and injected coal, the gaseous fuel includes decarbonized gas and coke oven gas, and the decarbonized gas is the gas at the top of the furnace being CO ２ and H ２ Reducing CO and H are generated by removing S. ２ The decarbonized gas is used, and the furnace material's ore-dressing structure uses basic ore, acidic ore, and / or natural lump ore. Of these, the amount of coke used in the solid fuel is 250-280 kg / tHM, the amount of blown coal used is 40-80 kg / tHM, and the amount of decarbonized gas blown in and circulated in the gaseous fuel is 450-750 Nm³. ３ The ratio is / tHM, and the coke oven gas injection consumption is 50-150 Nm³. ３ / thHM, 2) The decarbonized gas described in the method is heated by a gas heating furnace. At the outlet of the gas heating furnace, coke oven gas is mixed and added. The temperature of the high-temperature mixed gas after mixing and adding is 1200 °C, and it is composed of the following components measured by volume fraction: CO: 55-60%, H ２ : 12-25%, N ２ : 3-5%, CO ２ : 0-3%, CH ４ : 8-10%. The high-temperature mixed gas obtained by mixing and adding coke oven gas to the decarbonized gas in this step is blown into the furnace barrel by a combined blowing device, and the pressure of the decarbonized gas is controlled to be 0.35-0.4 MPa. Specifically, as shown below, A: Mixing and adding room-temperature coke oven gas (COG) from the hot gas piping after the gas heating furnace solves the problem of coke oven gas directly entering the high-temperature region of the dome of the gas heating furnace, and the coke oven gas and H ２ At high temperatures, SiO ２ In the process of reacting with and adding room-temperature coke oven gas, the temperature of the decarbonized gas is 40°C, and the average specific heat capacity is 1.371 kJ / Nm³. ３ The temperature is 25°C, the coke oven gas temperature is 25°C, and the average specific heat capacity is 1.369 kJ / Nm³. ３ The temperature is 0°C, and when room-temperature coke oven gas is mixed and added to the decarbonized gas, and the temperature of the injected high-temperature mixed gas reaches an injection temperature of 1200°C, the flow rate of the decarbonized gas is 20000 Nm³. ３ / h to 190,000 Nm ３ The amount of heat required to heat the oven from 40°C to 1200°C increased from 30.3 GJ to 288 GJ, and the coke oven gas flow rate increased to 1000 Nm³. ３ / h to 14600Nm ３ When increasing to / h, the amount of heat required to heat the temperature from 25°C to 1200°C increases from 1.6 GJ to 23.5 GJ, the total amount of heat added by mixing ambient coke oven gas and decarbonization gas increases from 31.9 GJ to 311.5 GJ, and in order to maintain the blowing temperature of the mixed medium at 1200°C after mixing, the actual outlet temperature of the gas heating furnace increases from 1261.7°C to 1294.8°C, the top gas of the hydrogen reduction-enhanced oxygen blast furnace passes through a dust removal and dewatering device, is pressurized to 0.45 to 1.6 MPa by a pressurizer, and enters the decarbonization device with CO2 ２ It removes the reducing components CO and H ２ A gas medium containing a volume fraction of 65-85% is formed, and after detecting the pressure, temperature, and flow rate, it enters a gas heating furnace and is heated to over 1200°C, and then blown into the lower furnace tube of a hydrogen reduction-enhanced oxygen blast furnace using a combined blowing device. A1: To maintain the stability of the blown gas temperature, temperature fluctuations are controlled to ±(5-10)°C, a 40°C mixed cold decarbonized gas is introduced before it enters the gas heating furnace, and then mixed and added to the heated hot gas piping system to stabilize the temperature blown into the furnace at 1200°C. A2: CO and H are reducing components in the blown gas. ２ To improve the content, the coke oven gas itself has a volume fraction of 55-60% CO + H ２ In addition to containing CH4, which has a volume fraction of 22-24% in coke oven gas. ４ CO and H ２ To decompose or fission it, and to maintain the stability of the blown-in gas temperature, the temperature fluctuation is controlled to ±(5-10)°C, the coke oven gas is mixed with the decarbonized hot gas piping system after heating in the gas heating furnace, the temperature at which it is blown into the furnace is stabilized at 1200°C, and the pressure of the coke oven gas needs to be 50-100 kPa higher than the hot decarbonized gas pressure. A3: The flow rate of coke oven gas should be 1000 to 14600 Nm ３ The flow rate is fixed at / h, and a flow control device is adjusted to introduce a 40°C mixed cold decarbonized gas before it enters the gas heating furnace, stabilizing the temperature of the gas injected into the furnace at 1200°C. A4: Adjust the flow rate control device to set the mixing flow rate of the coke oven gas to 1000-14600 Nm ３ The mixing flow rate for adjusting the coke oven gas is set to 14600 Nm / h. ３ If the temperature reaches / h, the temperature of the gas injected into the furnace should be higher than 1200°C. This allows for adjustment of the flow rate control device that introduces a 40°C mixed cold decarbonized gas before it enters the gas heating furnace, and the temperature of the gas injected into the furnace should be stabilized at 1200°C. A5: The pressure of the coke oven gas needs to be 30-40 kPa lower than the pressure of the hot decarbonized gas. Two flow cutoff devices are installed, which automatically close to prevent mixing and adding. The safety protection device shuts off the natural gas source and the coke oven gas source simultaneously with the flow cutoff device and N ２ It is a device for injecting, 3) The raw materials and coke for the hydrogen reduction-enhanced oxygen blast furnace are weighed using an adding device, and the lot iron production volume, theoretical coke ratio, and slag basicity of the raw fuel are calculated. The raw materials, measured by ore-dressing mass fraction, contain 40-55% basic ore, 40-50% acidic ore, 5-10% natural lump ore, and 250-280 kg / tHM of coke. The raw fuel, consisting of basic ore, acidic ore, natural lump ore, and coke, is added in layers from the adding device at the top of the furnace. The blown coal, decarbonized gas, and coke oven gas are blown into the furnace tube by a combined blowing device at the bottom of the furnace tube. The combined blowing device also blows industrial oxygen into the furnace tube. The oxygen content of the industrial oxygen is 90-99.9% ambient temperature cold oxygen, and the amount of oxygen blown in is 160-230 Nm³. ３ A method for injecting decarbonized gas and coke oven gas into a hydrogen-reduced enhanced oxygen blast furnace, characterized by controlling the flow rate to / tHM and further obtaining the final products of molten iron, by-product gas, and slag using a hydrogen-reduced enhanced oxygen blast furnace.

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