Adjusting system and adjusting method for HyCROF blast furnace injection gas

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a HyCROF blast furnace injection gas adjusting system which comprises a blast furnace and a PLC, the air inlet end of the blast furnace communicates with a tuyere small sleeve and communicates with a hot blast stove through the tuyere small sleeve, and a dust removal system and a decarburization system are connected to the blast furnace in series. A gas inlet valve, a filter, an outlet valve, a flow meter and a pressurizing machine are connected in series with an outlet of the decarburization system and the coke oven gas pipe, the pressurizing machine is communicated with the hot blast stove, and the flow meter is electrically connected with the PLC. In order to solve the problem of low reduction reaction efficiency in a furnace caused by oxygen-coal ratio imbalance due to gas composition and flow fluctuation in a traditional blast furnace ironmaking system, the method comprises the following steps: detecting the flow of decarburized gas and coke oven gas in real time, calculating the oxygen supply amount of theoretical mixed gas and adjusting the opening degree of an oxygen valve; therefore, the problems of low reduction reaction efficiency and high energy consumption in the furnace caused by deviation between the pressure, the flow and the components of the hot coal gas injected by the tuyere small sleeve and the actual demand quantity are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace ironmaking, in particular to a kind of HyCROF blast furnace coal gas injection regulating system and adjustment method. BACKGROUND

[0002] HyCROF blast furnace tuyere coal gas injection is the basis of HyCROF blast furnace production, and is also a key technical link for realizing low-carbon smelting. Through tuyere coal gas injection technology, HyCROF blast furnace can reduce CO2 emissions by more than 18%, reduce solid fuel consumption by more than 30%, effectively achieve carbon emission reduction and fuel consumption reduction, and provide important technical support for low-carbon transformation of the steel industry. The technical principle is that at the front end of the blast furnace tuyere rotation zone, coke reacts with pure oxygen to mainly generate CO2 and release a large amount of heat; at the rear end of the rotation zone and the boundary layer, oxygen is basically consumed, coke has a carbon dissolution loss reaction with CO2 and absorbs part of the heat, at the same time, CH4 in the injected coal gas will complete the cracking reaction in the tuyere rotation zone to generate CO and H2, which can be used to reduce iron ore, providing reducing agent and a large amount of heat for reducing iron ore, and achieving the role of replacing part of the coke.

[0003] The blast furnace tuyere small sleeve is a key equipment in the core production link of long process steel enterprises. As an important part of the blast furnace tuyere, its main function is to deliver hot air, coal powder or hot coal gas to the ironmaking blast furnace to ensure normal production of the blast furnace. However, factors such as the nature and distribution of the furnace charge in the blast furnace will have an important impact on the hot coal gas injected from the tuyere small sleeve, and thus affect the efficiency of the reduction reaction in the furnace and energy consumption. If the powder content in the furnace charge is high, the particle size is uneven, or the coke quality is poor, the permeability of the furnace charge will decrease, at this time, the resistance of the hot coal gas injected from the tuyere small sleeve increases when flowing in the furnace, the pressure loss increases, thus the actual pressure of the injected hot coal gas is lower than the expected value, and the flow will also decrease accordingly; when the permeability of the furnace charge is poor, the contact time of the coal gas with the furnace charge is reduced, and the reduction reaction cannot be carried out fully, the carbon monoxide and hydrogen in the hot coal gas are not fully utilized, which will cause the composition of the hot coal gas to deviate from the actual demand, reduce the efficiency of the reduction reaction, and increase energy consumption.

[0004] Therefore, in order to solve the above problems, it is necessary to design a kind of HyCROF blast furnace coal gas injection regulating system and adjustment method, to solve the problem that the pressure, flow and composition of the hot coal gas injected from the tuyere small sleeve deviate from the actual demand due to the influence of the furnace charge in the blast furnace, resulting in low reduction reaction efficiency and high energy consumption in the furnace. SUMMARY

[0005] The present application aims to provide a HyCROF blast furnace coal gas injection adjustment system and adjustment method to solve the problem of deviation of the pressure, flow and composition of hot coal gas injected from the tuyere small sleeve from the actual demand due to the influence of the blast furnace charge, resulting in low reduction reaction efficiency and high energy consumption in the furnace.

[0006] To achieve the above-mentioned purpose, the basic scheme provided by the present application is: a HyCROF blast furnace coal gas injection adjustment system, comprising a blast furnace, a coke oven gas pipe, a hot blast stove and a PLC controller, a gas pressure transmitter is arranged on the blast furnace, a tuyere small sleeve is communicated with the gas inlet end of the blast furnace, the blast furnace is communicated with the hot blast stove through the hot blast channel on the tuyere small sleeve, an oxygen branch pipe is communicated with the oxygen inlet of the tuyere small sleeve, an oxygen electric control valve, an oxygen total valve and an oxygen flowmeter are arranged on the oxygen branch pipe, a coal gas pipe is communicated with the blast furnace, a dust removal system is arranged at the other end of the coal gas pipe, a decarburization system is communicated with the outlet of the dust removal system, a decarburized coal gas filter is arranged on the outlet of the decarburization system, a decarburized coal gas inlet valve is arranged on the pipeline communicated with the decarburization system and the decarburized coal gas filter, a pressurizing machine A is communicated with the outlet of the decarburized coal gas filter, a decarburized coal gas outlet valve and a decarburized coal gas flowmeter are arranged on the pipeline communicated with the decarburized coal gas filter and the pressurizing machine A, a coke oven gas inlet valve and a coke oven gas filter are arranged on the coke oven gas pipe, a pressurizing machine B is communicated with the outlet of the coke oven gas filter, a coke oven gas outlet valve and a coke oven gas flowmeter are arranged on the pipeline communicated with the coke oven gas filter and the pressurizing machine B, the pressurizing machine A and the pressurizing machine B are both communicated with the hot blast stove, a mixed coal gas flowmeter and a hot blast inlet valve are arranged on the pipeline communicated with the pressurizing machine A and the pressurizing machine B and the hot blast stove, a hot blast valve and a coal gas pressure gauge are arranged on the pipeline communicated with the hot blast stove and the blast furnace, and the gas pressure transmitter, the oxygen flowmeter, the decarburized coal gas flowmeter, the coke oven gas flowmeter and the mixed coal gas flowmeter are all electrically connected with the PLC controller.

[0007] The present application has the following beneficial effects: (1) the present application detects the flow of decarburized coal gas and coke oven gas in real time through the coal gas flowmeters, then calculates the required oxygen amount after the mixing of the theoretical decarburized coal gas and coke oven gas through the central control room host computer, and adjusts the valve opening degree through the PLC controller, so as to ensure that the actual oxygen supply amount is the same as the theoretical oxygen supply amount, thereby solving the problem of low reduction reaction efficiency and high energy consumption in the furnace caused by the fluctuation of coal gas composition, pressure and flow; (2) the present application uses an optical transmitter-optical receiver link to transmit the data signals of each flowmeter, which can effectively avoid the distortion problem caused by signal attenuation and electromagnetic interference when the traditional cable is used for long-distance transmission, thereby ensuring the accuracy and real-time performance of the control signal and providing a reliable data basis for high-precision control.

[0008] Scheme two, which is the preferred embodiment of the base scheme, the outlet pipeline of the decarburization system is connected in parallel with a decarburization gas bypass valve A and a decarburization gas filter, the outlet end of the decarburization gas filter is provided with a decarburization gas bypass valve B, the coke oven gas pipe is connected in parallel with a coke oven gas bypass valve A and a coke oven gas filter, and the outlet end of the coke oven gas filter is provided with a coke oven gas bypass valve B; the parallel design can realize switching to the standby pipeline when the filter of any one of the decarburization gas or the coke oven gas is blocked to cause the flow to decrease, so that the continuous gas supply of the system can be maintained.

[0009] Scheme three, a method for adjusting the blast furnace injection gas of HyCROF, comprising the following steps: S1: first, open the decarburization gas inlet valve, the decarburization gas outlet valve and the coke oven gas inlet valve in sequence, so that the top gas enters the dust removal system through the gas pipe for dust removal and cooling, then enters the decarburization system to remove CO2 in the top gas, and then enters the decarburization gas filter, and then enters the hot blast stove through the pressure machine A after being pressurized, the coke oven gas enters the coke oven gas filter through the coke oven gas pipe and is pressurized by the pressure machine B and then enters the hot blast stove, at this time, the decarburization gas flow meter and the coke oven gas flow meter measure the flow of the decarburization gas and the coke oven gas in real time, convert the electrical signal into an optical signal through an optical transmitter, and then transmit it to an optical receiver, and then convert it into an electrical signal through the optical receiver and transmit it to the main machine in the central control room through the PLC controller; S2: then, the main machine in the central control room calculates the total flow of the mixed decarburization gas and coke oven gas according to the actual measured decarburization gas flow and coke oven gas flow, and then calculates the valve opening degree of the decarburization gas inlet valve and the coke oven gas inlet valve according to the total flow of the mixed decarburization gas and coke oven gas; S3: then, the total oxygen supply of the theoretical tuyere small sleeve is calculated according to the total flow of the mixed decarburization gas and coke oven gas, the hydrogen content in the blast furnace and the change of the blast furnace heat value; S4: then, the total oxygen supply of the theoretical tuyere small sleeve is compared with the actual oxygen supply measured by the oxygen flow meter, and the difference is calculated, and then the opening degree of the oxygen electric control valve is adjusted according to the difference.

[0010] By real-time detection of the flow of decarburization gas and coke oven gas, the main machine in the central control room calculates the required oxygen amount of the mixed decarburization gas and coke oven gas, and adjusts the valve opening degree through the PLC controller, so as to ensure that the actual oxygen supply amount is the same as the theoretical oxygen supply amount, and solves the problem of reduced reduction reaction efficiency in the traditional blast furnace gas injection due to the fluctuation of gas composition, pressure and flow.

[0011] Scheme four, which is the preferred embodiment of scheme three, in S2, the valve opening degree calculation formula of the decarburization gas inlet valve and the coke oven gas inlet valve is: Wherein Qg is the standard state gas flow, Kv is the flow coefficient, P1 is the absolute pressure before the valve (absolute pressure = gauge pressure + 101.3 KPa), ΔP is the pressure difference before and after the valve, G is the gas specific gravity, T1 is the absolute temperature of the gas inlet, Z is the compression coefficient, X T is the critical pressure difference ratio coefficient.

[0012] Scheme five, which is a preferred scheme of scheme three, in S3, the calculation formula of the total oxygen supply amount of the tuyere small sleeve is: Wherein Vgas is the amount of injected coal gas, y CO and y H2 are the volume percentages of CO and H2 in the injected coal gas respectively, Ccoke is the coke ratio, φ is the coke combustion rate in front of the tuyere, which is 70%, [Fe] is the iron content of pig iron, which is 95%, and rd is the direct reduction degree of iron.

[0013] Scheme six, which is a preferred scheme of scheme three, in S4, if the difference between the total oxygen supply amount of the theoretical tuyere small sleeve and the actual oxygen supply amount measured by the oxygen flowmeter is greater than 0, the opening of the oxygen electric control valve is increased, if the difference between the total oxygen supply amount of the theoretical tuyere small sleeve and the actual oxygen supply amount measured by the oxygen flowmeter is less than 0, the opening of the oxygen electric control valve is decreased; so that the actual oxygen supply amount is the same as the theoretical oxygen supply amount. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of a HyCROF blast furnace coal gas injection adjustment system. DETAILED DESCRIPTION

[0015] The present application will be further described in detail through specific embodiments: The drawing editing in the accompanying drawings of the specification includes: 1, blast furnace; 2, coke oven gas pipe; 3, hot blast stove; 4, gas pressure transmitter; 5, tuyere small sleeve; 6, oxygen branch pipe; 7, oxygen electric control valve; 8, oxygen total valve; 9, oxygen flowmeter; 10, coal gas pipe; 11, dust removal system; 12, decarburization system; 13, decarburization gas filter; 14, decarburization gas inlet valve; 15, press A; 16, decarburization gas outlet valve; 17, decarburization gas flowmeter; 18, coke oven gas inlet valve; 19, coke oven gas filter; 20, press B; 21, coke oven gas outlet valve; 22, coke oven gas flowmeter; 23, mixed gas flowmeter; 24, hot blast stove inlet valve; 25, hot blast valve; 26, coal gas pressure gauge; 27, decarburization gas bypass valve A; 28, decarburization gas bypass valve B; 29, coke oven gas bypass valve A; 30, coke oven gas bypass valve B.

[0016] Example one For example Figure 1As shown, a HyCROF blast furnace pulverized gas regulation system includes a blast furnace 1, a coke oven gas pipe 2, a hot blast stove 3, and a PLC controller. A gas pressure transmitter 4 is installed on the blast furnace 1. A tuyere sleeve 5 connects to the gas inlet of the blast furnace 1. The blast furnace 1 is connected to the hot blast stove 3 through a hot blast channel on the tuyere sleeve 5. An oxygen branch pipe 6 connects to the oxygen inlet of the tuyere sleeve 5. An oxygen electric control valve 7, an oxygen main valve 8, and an oxygen flow meter 9 are installed on the oxygen branch pipe 6. A gas pipe 10 connects to the blast furnace 1, and the other end of the gas pipe 10... The system includes a dust removal system 11, whose outlet is connected to a decarbonization system 12. A decarbonization gas filter 13 is installed at the outlet of the decarbonization system 12. A decarbonization gas inlet valve 14 is installed on the pipeline connecting the decarbonization system 12 and the decarbonization gas filter 13. A compressor A15 is connected to the outlet of the decarbonization gas filter 13. A decarbonization gas outlet valve 16 and a decarbonization gas flow meter 17 are connected in series on the pipeline connecting the decarbonization gas filter 13 and the compressor A15. A decarbonization gas bypass valve A2 is connected in parallel on the outlet pipeline of the decarbonization system 12. 7 and decarbonized gas filter 13, the outlet end of decarbonized gas filter 13 is equipped with decarbonized gas bypass valve B28, coke oven gas pipe 2 is equipped with coke oven gas inlet valve 18 and coke oven gas filter 19, the outlet of coke oven gas filter 19 is connected to compressor B20, coke oven gas outlet valve 21 and coke oven gas flow meter 22 are connected in series on the pipeline connecting coke oven gas filter 19 and compressor B20, coke oven gas bypass valve A29 and coke oven gas filter 19 are connected in parallel on coke oven gas pipe 2, coke oven gas filter 1... The outlet end of 9 is equipped with a coke oven gas bypass valve B30. Both the pressurizer A15 and the pressurizer B20 are connected to the hot blast stove 3. The pipeline connecting the pressurizer A15 and the pressurizer B20 to the hot blast stove 3 is equipped with a mixed gas flow meter 23 and a hot blast stove inlet valve 24. The pipeline connecting the hot blast stove 3 to the blast furnace 1 is equipped with a hot blast valve 25 and a gas pressure gauge 26. The gas pressure transmitter 4, oxygen flow meter 9, decarbonized gas flow meter 17, coke oven gas flow meter 22 and mixed gas flow meter 23 are all electrically connected to the PLC controller.

[0017] Example 2 A method for adjusting the injected blast furnace gas in a HyCROF furnace, such as... Figure 1 The steps shown are as follows: S1: First, open the decarbonized gas inlet valve 14, decarbonized gas outlet valve 16, and coke oven gas inlet valve 18 in sequence, so that the top gas enters the dust removal system 11 through the gas pipe 10 for dust removal and cooling. Then, it enters the decarbonization system 12 to remove CO2 from the top gas and then enters the decarbonized gas filter 13. After being pressurized by the pressurizer A15, it is introduced into the hot blast stove 3. The coke oven gas enters the coke oven gas filter 19 through the coke oven gas pipe 2 and is pressurized by the pressurizer B20 before being introduced into the hot blast stove 3. At this time, the decarbonized gas flow meter 17 and the coke oven gas flow meter 22 measure the flow of decarbonized gas and coke oven gas in real time and convert the electrical signal into an optical signal through the optical transmitter and transmit it to the optical receiver. Then, after being converted into an electrical signal by the optical receiver, it is transmitted to the main unit in the central control room through the PLC controller. S2: Next, the central control room host calculates the theoretical total flow rate of the mixture of decarbonized gas and coke oven gas based on the actual measured flow rates of the decarbonized gas and coke oven gas. Then, based on the theoretical total flow rate of the mixture, the valve openings of the decarbonized gas inlet valve 14 and the coke oven gas inlet valve 18 are calculated. The valve openings of the decarbonized gas inlet valve 14 and the coke oven gas inlet valve 18 are determined using the formula... The calculations show that Qg is the standard state gas flow rate, Kv is the flow coefficient, P1 is the absolute pressure before the valve (absolute pressure = gauge pressure + 101.3 kPa), ΔP is the pressure difference before and after the valve, G is the specific gravity of the gas, T1 is the absolute temperature of the gas inlet (25℃), Z is the compressibility coefficient, and X... T X is the critical differential pressure ratio coefficient (the valve used in the field is a ball valve, therefore X). T ≈0.25); S3: Then, based on the total flow rate of the theoretical decarbonized gas and coke oven gas mixture, the hydrogen content in blast furnace 1, and the change in the calorific value of blast furnace 1, the total oxygen supply of the theoretical tuyeres 5 is calculated. The total oxygen supply of the tuyeres 5 is determined by the formula... The calculations show that Vgas is the amount of injected pulverized gas, and y is the amount of pulverized gas. CO and y H2 The values ​​are: volume percentage of CO and H2 in the injected pulverized gas (CO accounts for 45%-60% and H2 accounts for 10%-20%), Ccoke is the coke ratio, which ranges from 170-290 kg / tFe under the HyCROF blast furnace process, φ is the coke combustion rate before the tuyeres, which is 70%, [Fe] is the iron content of pig iron, which is 95%, and rd is the direct reduction degree of iron, which ranges from 0.06-0.25 under the HyCROF blast furnace process. S4: Then the total amount of oxygen supply of the theoretical tuyere small sleeve 5 is compared with the actual amount of oxygen supply measured by the oxygen flow meter 9, and the difference is calculated. If the difference between the total amount of oxygen supply of the theoretical tuyere small sleeve 5 and the actual amount of oxygen supply measured by the oxygen flow meter 9 is greater than 0, the opening of the oxygen electric control valve 7 is increased, and if the difference between the total amount of oxygen supply of the theoretical tuyere small sleeve 5 and the actual amount of oxygen supply measured by the oxygen flow meter 9 is less than 0, the opening of the oxygen electric control valve 7 is decreased, so that the actual oxygen supply amount is the same as the theoretical oxygen supply total amount.

[0018] Table 1: Theoretical oxygen supply and actual oxygen supply information table 1 2 3 4 5 Decarbonized gas flow rate 40000 m 3 / h]] 39700 m 3 / h]] 38700 m 3 / h]] 38400 m 3 / h]] 37600 m 3 / h]] Coke oven gas flow rate 12000 m 3 / h]] 13200 m 3 / h]] 12900 m 3 / h]] 13200 m 3 / h]] 13700 m 3 / h]] Theoretical mixed gas flow rate 52000 m 3 / h]] 52900 m 3 / h]] 51600 m 3 / h]] 50600 m 3 / h]] 51300 m 3 / h]] Actual mixed gas flow rate 52100 m 3 / h]] 51900 m 3 / h]] 51300 m 3 / h]] 50900 m 3 / h]] 49500 m 3 / h]] Hydrogen content of mixed gas 14.50% 15.00% 15.30% 16.20% 18.10% Actual oxygen demand flow rate 22933m 3 / h]] 21827m 3 / h]] 21468m 3 / h]] 21110m 3 / h]] 19497m 3 / h]] Theoretical oxygen supply 22127m 3 / h]] 21916m 3 / h]] 21520m 3 / h]] 20740 m 3 / h]] 19730 m 3 / h]] As shown in Table 1, the actual flow of HyCROF blast furnace injection decarburization gas and coke oven gas in the actual production process is shown, as well as the theoretical gas flow after mixing decarburization gas and coke oven gas, and the actual flow and oxygen supply after mixing. According to the actual production practice, it is concluded that for every 600 Nm 3 of mixed gas, the oxygen consumption is reduced by 300 Nm 3 , that is, the ratio of the reduced flow of mixed gas and the reduced flow of oxygen consumption is 2:1.

[0019] The above is only an embodiment of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described in detail. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A regulating system for injected blast furnace gas in a HyCROF furnace, characterized in that, The system includes a blast furnace (1), a coke oven gas pipe (2), a hot blast stove (3), and a PLC controller. The blast furnace (1) is equipped with a gas pressure transmitter (4). The blast furnace (1) has a tuyer sleeve (5) connected to its gas inlet. The blast furnace (1) is connected to the hot blast stove (3) through a hot blast channel on the tuyer sleeve (5). An oxygen branch pipe (6) is connected to the oxygen inlet of the tuyer sleeve (5). An oxygen electric control valve (7), an oxygen main valve (8), and an oxygen flow meter (9) are installed on the oxygen branch pipe (6). A gas pipe (10) is connected to the gas pipe (10). A dust removal system (11) is provided at the other end of the gas pipe (10). The outlet of the dust removal system (11) is connected to a decarbonization system (12). A decarbonization gas filter (13) is provided at the outlet of the decarbonization system (12). A decarbonization gas inlet valve (14) is provided on the pipeline connecting the decarbonization system (12) and the decarbonization gas filter (13). A compressor A (15) is connected to the outlet of the decarbonization gas filter (13). The decarbonization gas filter (13) and the compressor A (15) 15) A decarbonized gas outlet valve (16) and a decarbonized gas flow meter (17) are connected in series on the connecting pipeline. A coke oven gas inlet valve (18) and a coke oven gas filter (19) are provided on the coke oven gas pipe (2). The outlet of the coke oven gas filter (19) is connected to a compressor B (20). A coke oven gas outlet valve (21) and a coke oven gas flow meter (22) are connected in series on the connecting pipeline between the coke oven gas filter (19) and the compressor B (20). Both the compressor A (15) and the compressor B (20) are connected in series. The hot blast stove (3) is connected to the pipeline of the pressurizer A (15) and pressurizer B (20) connected to the hot blast stove (3), and a mixed gas flow meter (23) and a hot blast stove inlet valve (24) are provided. The hot blast stove (3) is connected to the pipeline of the blast furnace (1), and a hot blast valve (25) and a gas pressure gauge (26) are provided. The gas pressure transmitter (4), oxygen flow meter (9), decarbonized gas flow meter (17), coke oven gas flow meter (22) and mixed gas flow meter (23) are all electrically connected to the PLC controller.

2. The regulating system for HyCROF blast furnace injection gas according to claim 1, characterized in that, The decarbonization system (12) has a decarbonization gas bypass valve A (27) and a decarbonization gas filter (13) connected in parallel on the outlet pipe. The outlet end of the decarbonization gas filter (13) is equipped with a decarbonization gas bypass valve B (28). The coke oven gas pipe (2) has a coke oven gas bypass valve A (29) and a coke oven gas filter (19) connected in parallel. The outlet end of the coke oven gas filter (19) is equipped with a coke oven gas bypass valve B (30).

3. A method for adjusting the injected blast furnace gas in a HyCROF furnace, characterized in that, Includes the following steps: S1: First, open the decarbonized gas inlet valve (14), decarbonized gas outlet valve (16) and coke oven gas inlet valve (18) in sequence so that the top gas enters the dust removal system (11) through the gas pipe (10) for dust removal and cooling. Then, it enters the decarbonization system (12) to remove CO2 from the top gas and then enters the decarbonized gas filter (13). After being pressurized by the pressurizer A (15), it is introduced into the hot blast stove (3). The coke oven gas enters the coke oven gas filter (19) through the coke oven gas pipe (2) and is pressurized by the pressurizer B (20) and then introduced into the hot blast stove (3). At this time, the decarbonized gas flow meter (17) and the coke oven gas flow meter (22) measure the flow rate of the decarbonized gas and the coke oven gas in real time and convert the electrical signal into an optical signal through the optical transmitter and transmit it to the optical receiver. Then, after being converted into an electrical signal through the optical receiver, it is transmitted to the host in the central control room through the PLC controller. S2: Then the main unit in the central control room calculates the total flow rate of the theoretical decarbonized gas and coke oven gas after mixing by the actual measured flow rate of decarbonized gas and coke oven gas. Then, based on the total flow rate of the theoretical decarbonized gas and coke oven gas, the valve opening of the decarbonized gas inlet valve (14) and the coke oven gas inlet valve (18) is calculated. S3: Then, based on the total flow rate of the theoretical decarbonized gas and coke oven gas after mixing, the hydrogen content in the blast furnace (1) and the change in the calorific value of the blast furnace (1), the total oxygen supply of the theoretical tuyeres (5) is calculated. S4: Then compare the total oxygen supply of the theoretical air outlet sleeve (5) with the actual oxygen supply measured by the oxygen flow meter (9), calculate the difference, and then adjust the opening of the oxygen electric control valve (7) according to the difference.

4. The method for adjusting the injected blast furnace gas of HyCROF according to claim 3, characterized in that, In S2, the valve opening formulas for the decarbonized gas inlet valve (14) and the coke oven gas inlet valve (18) are as follows: Where Qg is the standard state gas flow rate, Kv is the flow coefficient, P1 is the absolute pressure before the valve (absolute pressure = gauge pressure + 101.3 kPa), ΔP is the pressure difference before and after the valve, G is the specific gravity of the gas, T1 is the absolute temperature of the gas inlet, Z is the compressibility coefficient, and X... T This is the critical pressure differential ratio coefficient.

5. The method for adjusting the injected blast furnace gas of HyCROF according to claim 3, characterized in that, In S3, the formula for calculating the total oxygen supply of the small air vent sleeve (5) is: Where Vgas is the amount of injected pulverized gas, y CO and y H2 Here, CO and H2 are the volume percentages in the injected pulverized gas, Ccoke is the coke ratio, φ is the coke combustion rate before the tuyeres (70%), [Fe] is the iron content of pig iron (95%), and rd is the direct reduction degree of iron.

6. The method for adjusting the injected blast furnace gas of HyCROF according to claim 3, characterized in that, In S4, if the difference between the theoretical total oxygen supply of the small air outlet (5) and the actual oxygen supply measured by the oxygen flow meter (9) is greater than 0, the opening of the oxygen control valve (7) will be increased; if the difference between the theoretical total oxygen supply of the small air outlet (5) and the actual oxygen supply measured by the oxygen flow meter (9) is less than 0, the opening of the oxygen control valve (7) will be decreased; so that the actual oxygen supply is the same as the theoretical total oxygen supply.

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