Furnace body injection gas amount adjusting method for hydrogen-rich carbon circulating oxygen blast furnace

Abstract

The invention discloses a method for adjusting the amount of gas injected into a furnace body of a hydrogen-carbon-rich circulating oxygen blast furnace, which comprises the following steps of: analyzing experimental data of a hydrogen-carbon-rich circulating oxygen blast furnace model, and establishing a relation model of tuyere-furnace body gas injection and upper gas distribution of the hydrogen-carbon-rich circulating oxygen blast furnace; and reasonable distribution and full utilization of the amount of the furnace body blowing gas of the hydrogen-carbon-rich circulating oxygen blast furnace are realized on the basis of matching and adjusting of the tuyere-furnace body blowing gas under the working condition of the hydrogen-carbon-rich circulating oxygen blast furnace. According to the invention, the problems of unreasonable furnace body injection gas distribution and insufficient permeation to the radial center of the hydrogen-rich carbon circulation oxygen blast furnace are solved.

Description

Technical Field

[0001] The invention relates to a coal gas injection technology for a hydrogen-rich carbon circulating oxygen blast furnace, and more specifically to a method for adjusting the amount of coal gas injected into a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace. Background Art

[0002] Under the background of dual carbon, the carbon peak and carbon neutrality of the steel industry face severe challenges. At present, the steel industry is mainly based on the long process of blast furnace + converter smelting, and the main fuels are coke and pulverized coal. The ability of traditional blast furnace process to reduce carbon consumption and carbon emissions has reached its limit. Based on the traditional blast furnace process, the hydrogen-rich carbon circulating oxygen blast furnace process recycles the chemical energy of coal gas produced by the blast furnace and uses hydrogen to replace carbon as a reducing agent in the blast furnace ironmaking process to the maximum extent, so as to further reduce the carbon consumption of the blast furnace. The difference between the hydrogen-rich carbon circulating oxygen blast furnace and the traditional blast furnace is that the carbon chemical energy of the blast furnace can be fully utilized by reducing iron ore through full oxygen smelting and injecting high-temperature quality-improving circulating coal gas, as well as partially replacing carbon with hydrogen. At the same time, the hydrogen in the coal gas during the coal gas circulation process is recycled in the blast furnace, which solves the problem of decreased hydrogen utilization after the blast furnace uses a large amount of hydrogen-rich substances, thereby reducing the consumption of fossil energy in the blast furnace process and achieving the goal of further reducing carbon emissions from the blast furnace.

[0003] Due to the reduction of gas volume in the lower part of the blast furnace under the full oxygen smelting conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the internal heat distribution of the blast furnace will be uneven, that is, "hot at the bottom and cold at the top". The temperature of the upper part of the blast furnace is too low, resulting in insufficient preheating of the charge, which is easy to cause abnormal furnace conditions and affect the smooth operation of the blast furnace; the temperature of the blast furnace top is too low, which will cause condensation and dust adhesion in the gas riser and downcomer, resulting in an accident of blocking the gas pipeline, and the water vapor of the water-containing gas will condense and settle with the dust in the gas in the gravity dust collector, blocking the ash discharge channel at the bottom, causing the gas ash to harden in the lower cone section of the gravity dust collector, seriously affecting the normal production of the hydrogen-rich carbon cycle oxygen blast furnace. By setting a high-temperature decarbonization and quality-improving gas inlet in the blast furnace body, the preheating of the iron ore in the upper part of the blast furnace can be increased, and the problem of cold top and hot bottom in the hydrogen-rich carbon cycle blast furnace can be solved. At the same time, the overall heat utilization and smooth operation of the charge in the blast furnace can be further optimized. After the coal gas injected into the furnace enters the blocky zone of the blast furnace, it is affected by the rising coal gas flow in the furnace and the radial resistance of the charge. The injected coal gas has a small penetration area to the center of the blast furnace and is easy to rise along the area near the blast furnace wall. In this way, the coal gas injected into the furnace body cannot get sufficient contact with the upper charge, and the coal gas utilization efficiency is very poor, and the injection effect cannot be achieved. Therefore, how to achieve the reasonable distribution and utilization of coal gas injected into the furnace body is the main difficulty in solving the problems of preheating the upper part of the furnace body and efficient utilization of injected coal gas.

[0004] In existing patent applications, such as Chinese patent CN 114350869A, an oxygen blast furnace structure for injecting reducing gas into the furnace body is disclosed, and an oxygen blast furnace structure for injecting reducing gas into the furnace body is introduced, including a blast furnace throat, a furnace body, a furnace waist, a furnace belly, a furnace hearth and a furnace base. The blast furnace hearth is provided with a circle of a certain number of tuyere for injecting pulverized coal and oxygen, and the distances between the tuyere are equal. The cooling walls at the lower part of the furnace body are staggered, and reducing gas nozzles with the same number as the tuyere are arranged at the staggered positions; a circle of reducing gas surrounding pipes is provided on the outer side of the blast furnace body, and gooseneck pipes, bellows compensators, straight pipes and bent pipes are provided between the surrounding pipes and the nozzles, which are used to inject reducing gas into the furnace body, thereby realizing the function of injecting high-reducing high-temperature coal gas in the traditional blast furnace body. The staggered design of the lower part of the furnace body can ensure that the high-temperature and high-reducing coal gas can be evenly distributed in the lower part of the furnace body after entering the lower area of ​​the furnace body, thereby ensuring the maximization of the utilization efficiency of the coal gas entering the furnace. For example, Chinese patent application No. 202310529988 discloses a method for increasing the gas temperature at the top of a hydrogen-rich carbon cycle oxygen blast furnace, and proposes a method for increasing the gas temperature at the top of a hydrogen-rich carbon cycle oxygen blast furnace. A combustion heat storage device for burning decarbonized gas is installed at the throat steel brick of the throat of the hydrogen-rich carbon cycle oxygen blast furnace. The combustion tube of the combustion heat storage device adopts high-speed airflow jet heating technology. The decarbonized gas and compressed air flow and mix in the combustion tube in a certain proportion, and are ignited and burned by the electronic spark device on the inner tube wall to form a stable heat source. A large amount of excess coal gas and flue gas hot gas is ejected at a high speed of 110 to 250 m / s, which generates strong convective heat transfer in the hydrogen-rich carbon cycle oxygen blast furnace, and due to the strong stirring of a large amount of gas, the mixing temperature of the low-temperature gas at the top of the hydrogen-rich carbon cycle oxygen blast furnace is uniform. For example, Chinese patent application No. 202111468019 discloses a blowing control device and method for low-carbon smelting in a blast furnace, and introduces a blowing control device and method for low-carbon smelting in a blast furnace, including a blast furnace tuyere for introducing oxygen-enriched or pure oxygen to form a tuyere whirlpool zone; multiple temperature-adjusting blowing ports are evenly arranged along the circumference of the blast furnace, and the temperature near the tuyere whirlpool zone is used to cause the hydrocarbon-containing component injection to undergo thermal cracking reaction to form a hydrocarbon thermal cracking endothermic zone, and the gas products produced by the thermal cracking reaction of the hydrocarbon-containing component injection increase the amount of blast furnace gas, while carrying excess heat from the lower high-temperature zone to the upper part of the blast furnace, flexibly solving the problem of "hot below and cold above" in oxygen-enriched blast furnaces or oxygen blast furnaces. For example, Chinese patent application No. 201580015653 discloses an operating method for an oxygen blast furnace, and introduces an operating method for an oxygen blast furnace that can achieve low temperature in the combustion area in front of the tuyere while reducing CO2 emissions compared with the past. In an operating method of an oxygen blast furnace in which at least pure oxygen is blown into the tuyere and blast furnace gas with a small amount of nitrogen is produced from the furnace top, a tuyere-blown gas in which the sum of the volume percentages of hydrocarbons and hydrogen is 50% or more is blown into the tuyere together with the blowing of pure oxygen into the tuyere, thereby lowering the temperature of the combustion zone in front of the tuyere.

[0005] The above patented technology only involves the process design or furnace type design of hydrogen-rich carbon circulating oxygen blast furnace body gas injection, and does not involve the adjustment method related to the coordination of hydrogen-rich carbon circulating oxygen blast furnace tuyere-furnace gas injection. Summary of the invention

[0006] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon-circulating oxygen blast furnace, so as to solve the problems of unreasonable distribution of coal gas injected into the furnace body of the hydrogen-rich carbon-circulating oxygen blast furnace and insufficient penetration into the radial center of the hydrogen-rich carbon-circulating oxygen blast furnace.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A method for adjusting the amount of coal gas injected into the furnace of a hydrogen-rich carbon circulating oxygen blast furnace:

[0009] Through the experimental data analysis of the hydrogen-rich carbon cycle oxygen blast furnace model, a relationship model between the tuyere-furnace gas injection and the upper gas distribution of the hydrogen-rich carbon cycle oxygen blast furnace is established. Based on the operating conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the tuyere-furnace gas injection is matched and adjusted to achieve the reasonable distribution and full utilization of the furnace gas injection amount of the hydrogen-rich carbon cycle oxygen blast furnace.

[0010] Preferably, the method for adjusting the amount of coal gas injected into the furnace body specifically comprises the following steps:

[0011] S1. Establish a hydrogen-rich carbon cycle oxygen blast furnace model;

[0012] S2, using N2 and CO2 as gaseous media passing through the packed bed in the hydrogen-rich carbon cycle oxygen blast furnace model;

[0013] S3. Based on the experimental data of the hydrogen-rich carbon cycle oxygen blast furnace model, the relationship between the penetration distance of the furnace body injected coal gas in the injection direction and the radius of the hydrogen-rich carbon cycle oxygen blast furnace is derived by regression analysis;

[0014] S4. According to the experimental data analysis of the hydrogen-rich carbon cycle oxygen blast furnace model and in combination with the operating conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the adjustment of the tuyere-furnace body coal gas injection amount is established.

[0015] Preferably, the hydrogen-rich carbon cycle oxygen blast furnace model includes an air supply system, a model body and a data measurement system.

[0016] Preferably, the air supply system includes a N2 gas source, a CO2 gas source and a gas mixing chamber;

[0017] There are two N2 gas sources, one of which is connected to the furnace of the hydrogen-rich carbon cycle oxygen blast furnace through a gas pipeline;

[0018] The other N2 gas source and the CO2 gas source are both connected to the gas mixing chamber through a gas pipeline, and the gas mixing chamber is connected to the furnace body of the hydrogen-rich carbon cycle oxygen blast furnace through a gas pipeline;

[0019] A pressure valve is arranged on the gas pipeline.

[0020] Preferably, the ratio of N2:CO2 in the mixing chamber is 1:1.

[0021] Preferably, the data measurement system includes an electronic flow meter arranged on the gas pipeline, and a gas analyzer arranged on the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace.

[0022] Preferably, the furnace body of the hydrogen-rich carbon cycle oxygen blast furnace is provided with 9 rows of sampling holes, each row is provided with 10 holes;

[0023] The gas analyzer takes samples from the sampling hole;

[0024] The furnace body of the hydrogen-rich carbon circulating oxygen blast furnace is also provided with 5 auxiliary tuyere.

[0025] Preferably, in step S3, the relationship between the penetration distance of the coal gas injected into the furnace body in the injection direction and the radius of the hydrogen-rich carbon circulating oxygen blast furnace is B=R(0.8-0.85U / (U+V));

[0026] Where, B represents the distance on the center line of the auxiliary air outlet that has not been penetrated, unit: mm;

[0027] R represents the radius of the blast furnace along the horizontal direction of the auxiliary tuyere of the furnace body, unit: mm;

[0028] U represents the amount of gas injected into the furnace, unit: L / min;

[0029] V represents the amount of gas rising from the lower part of the furnace body, unit: L / min.

[0030] Preferably, in step S4, establishing the adjustment of the tuyere-furnace body gas injection amount specifically includes:

[0031] The injection volume of high-temperature upgraded coal gas at the lower tuyere is 600~700m 3 / t between;

[0032] The gas temperature is between 1200 and 1250°C;

[0033] The gas pressure is between 0.4 and 0.43 MPa;

[0034] Adjust the gas injection volume of the furnace body to 100~200m 3 / t between;

[0035] The gas temperature is between 900 and 950°C;

[0036] The gas pressure is between 0.3 and 0.35 MPa;

[0037] The wind speed at the furnace tuyere is between 20 and 30 m / s;

[0038] Keep the proportion of furnace body injection gas in the total furnace body gas between 10% and 25%;

[0039] Keep the depth of gas penetration in the furnace body between 0.90 and 1.25m.

[0040] The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon circulating oxygen blast furnace provided by the present invention has the following beneficial effects:

[0041] 1) The relationship between the amount of gas injected from the tuyere to the furnace body and the gas penetration depth in the furnace body of a hydrogen-rich carbon circulating oxygen blast furnace was established, providing a basis for adjusting the gas injection from the tuyere to the furnace body;

[0042] 2) In combination with the operating conditions of the hydrogen-rich carbon circulating oxygen blast furnace, on the premise of ensuring a certain amount of gas in the lower part of the hydrogen-rich carbon circulating oxygen blast furnace, by adjusting the proportion of furnace body gas in the total circulating gas volume, the depth of furnace body gas penetration is guaranteed to achieve the effect of rational utilization of furnace body gas injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structural framework of a hydrogen-rich carbon cycle oxygen blast furnace model in the method for adjusting the amount of coal gas injected into the furnace body of the present invention;

[0044] Figure 2 It is a schematic diagram of the relationship between the penetration distance of the furnace body injected coal gas in the injection direction and the radius of the hydrogen-rich carbon circulating oxygen blast furnace in the furnace body injected coal gas amount adjustment method of the present invention. DETAILED DESCRIPTION

[0045] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0046] The present invention provides a method for adjusting the amount of coal gas injected into the furnace of a hydrogen-rich carbon circulating oxygen blast furnace:

[0047] Through the experimental data analysis of the hydrogen-rich carbon cycle oxygen blast furnace model, the matching relationship between the tuyere and the furnace body gas injection of the hydrogen-rich carbon cycle oxygen blast furnace is clarified, and a relationship model between the tuyere-furnace gas injection and the upper gas distribution of the hydrogen-rich carbon cycle oxygen blast furnace is established. Based on the operating conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the tuyere-furnace gas injection is matched and adjusted to achieve the reasonable distribution and full utilization of the furnace body gas injection amount of the hydrogen-rich carbon cycle oxygen blast furnace.

[0048] The method for adjusting the amount of coal gas injected into the furnace body of the present invention specifically comprises the following steps:

[0049] S1. Establish a hydrogen-rich carbon cycle oxygen blast furnace model. Figure 1 As shown, the hydrogen-rich carbon cycle oxygen blast furnace model includes an air supply system, a model body and a data measurement system.

[0050] The air supply system includes two N2 gas sources 1, a CO2 gas source 2 and a gas mixing chamber 3;

[0051] One of the N2 gas sources 1 is connected to the furnace 4 of the hydrogen-rich carbon cycle oxygen blast furnace through a gas pipeline;

[0052] Another N2 gas source 1 and a CO2 gas source 2 are both connected to a gas mixing chamber 3 through a gas pipeline, and the gas mixing chamber 3 is connected to a furnace body 5 of a hydrogen-rich carbon cycle oxygen blast furnace through a gas pipeline;

[0053] A pressure valve 6 is provided on the gas pipeline.

[0054] According to the furnace body circulating gas process conditions of the hydrogen-rich carbon circulating oxygen blast furnace, two rows of tuyere are set in the furnace body 5 and the furnace 4. In order to investigate the influence of the position of the furnace body auxiliary tuyere on the permeability and distribution of the coal gas flow, five different auxiliary tuyere A, B, C, D, E are set at different positions of the furnace body 5.

[0055] The furnace body 5 has 9 rows of sampling holes 7 on its surface, 10 holes in each row, 90 holes in total, for connecting a gas analyzer to detect CO2 concentration distribution.

[0056] Only N2 is sprayed at the furnace shell injection inlet. Since the coal gas sprayed from the furnace body 5 and the rising coal gas generated from the furnace shell 4 do not react and the specific gravity between the two is not much different, a mixed gas of 1:1 N2:CO2 is blown into the auxiliary air inlets A, B, C, D, and E of the furnace body 5.

[0057] The data measurement system includes an electronic flow meter 8 arranged on the gas pipeline, and a gas analyzer arranged on the furnace body 5 of the hydrogen-rich carbon circulating oxygen blast furnace.

[0058] S2. N2 and CO2 are used as gas media passing through the packed bed in the hydrogen-rich carbon cycle oxygen blast furnace model. After the relevant pressure valve 6 is opened, they are mixed into one gas through the gas mixing chamber 3 and blown into the auxiliary tuyere A, B, C, D, and E of the furnace body 5. When one of the auxiliary tuyere is blowing, the other four are sealed, and the gas flow rate is controlled by the electronic flow meter 8. In addition, only N2 is blown into the tuyere of the furnace 4, and the gas flow rate is also controlled by the flow meter 8. During the experiment, the gas flow rate through all tuyere is kept constant.

[0059] S3. Based on the experimental data of the hydrogen-rich carbon cycle oxygen blast furnace model, the relationship between the penetration distance of the furnace body injected coal gas in the injection direction and the radius of the hydrogen-rich carbon cycle oxygen blast furnace is derived by regression analysis: B = R (0.8-0.85U / (U+V));

[0060] Where, B represents the distance on the center line of the auxiliary air outlet that has not been penetrated, unit: mm;

[0061] R represents the radius of the blast furnace along the horizontal direction of the auxiliary tuyere of the furnace body, unit: mm;

[0062] U represents the amount of gas injected into the furnace, unit: L / min;

[0063] V represents the amount of gas rising from the lower part of the furnace body, unit: L / min.

[0064] Combination Figure 2 As shown in the figure, the penetration depth of horizontal injection gas in the furnace is linearly related to U / (U+V). As U / (U+V) increases, the penetration depth gradually increases. The ratio of the amount of circulating gas in the blast furnace to the total amount of gas in the blast furnace, i.e., U / (U+V), plays a decisive role in the distribution of the injected gas in the blast furnace.

[0065] S4. According to the experimental data analysis of the hydrogen-rich carbon cycle oxygen blast furnace model and the operating conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the adjustment of the gas injection amount of the tuyere-furnace body is established. That is, under the premise of ensuring a certain amount of gas in the lower part of the hydrogen-rich carbon cycle oxygen blast furnace, the injection amount of high-temperature quality-improving gas in the lower tuyere is 600-700m 3 / t between;

[0066] The gas temperature is between 1200 and 1250°C;

[0067] The gas pressure is between 0.4 and 0.43 MPa;

[0068] Adjust the gas injection volume of the furnace body to 100~200m 3 / t between;

[0069] The gas temperature is between 900 and 950°C;

[0070] The gas pressure is between 0.3 and 0.35 MPa;

[0071] The wind speed at the furnace tuyere is between 20 and 30 m / s;

[0072] Keep the proportion of furnace body injection gas in the total furnace body gas between 10% and 25%;

[0073] Keep the depth of furnace gas penetration between 0.90 and 1.25 m to achieve the effect of rational utilization of furnace gas injection.

[0074] The problem to be solved by the present invention is the unreasonable distribution of coal gas injected into the furnace body of a hydrogen-rich carbon circulating oxygen blast furnace and the insufficient penetration into the radial center of the blast furnace. The problem also lies in how to match the coal gas injected into the upper furnace body with the coal gas injected into the lower tuyere to achieve the purpose of increasing the temperature of the upper furnace body, improving the preheating of the upper charge of the blast furnace, stabilizing the smooth operation of the blast furnace and reducing fuel consumption.

[0075] Example 1

[0076] In this embodiment 1, a 400m 3 Take the blast furnace as an example, with a daily output of 1800t / d, the furnace body radius at the center line of the furnace body gas injection tuyere is 3m, and the high-temperature quality-improving gas injection volume at the lower tuyere of the hydrogen-rich carbon circulating oxygen blast furnace is 700m 3 / t, the gas temperature is 1200℃, the gas pressure is 0.4MPa, and the gas injection volume of the furnace is adjusted to 100m 3 / t, the gas temperature is 900℃, the gas pressure is 0.3MPa, the wind speed of the furnace body tuyere is 21.5m / s, the proportion of the furnace body injected gas in the total furnace body gas is maintained at 13%, and the depth of furnace body gas penetration is 0.92m.

[0077] Example 2

[0078] In this embodiment 2, a 400m 3 Take the blast furnace as an example, with a daily output of 1800t / d, the furnace body radius at the center line of the furnace body gas injection tuyere is 3m, and the high-temperature quality-improving gas injection volume at the lower tuyere of the hydrogen-rich carbon circulating oxygen blast furnace is 650m 3 / t, gas temperature is 1220℃, gas pressure is 0.4MPa, and the gas injection volume of the furnace is adjusted to 150m 3 / t, the gas temperature is 920℃, the gas pressure is 0.3MPa, the wind speed of the furnace body tuyere is 23.3m / s, the proportion of the furnace body injected gas in the total furnace body gas is maintained at 19%, and the depth of furnace body gas penetration is 1.08m.

[0079] Example 3

[0080] In this embodiment 3, a 400m 3 Take the blast furnace as an example, with a daily output of 1800t / d, the furnace body radius at the center line of the furnace body gas injection tuyere is 3m, and the high-temperature quality-improving gas injection volume at the lower tuyere of the hydrogen-rich carbon circulating oxygen blast furnace is 600m 3 / t, gas temperature is 1230℃, gas pressure is 0.4MPa, and the gas injection volume of the furnace is adjusted to 200m 3 / t, the gas temperature is 950℃, the gas pressure is 0.3MPa, the wind speed of the furnace body tuyere is 27.2m / s, the proportion of the furnace body injected gas in the total furnace body gas is maintained at 25%, and the depth of furnace body gas penetration is 1.24m.

[0081] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for adjusting the amount of coal gas injected into the furnace of a hydrogen-rich carbon circulating oxygen blast furnace, characterized in that: Through the experimental data analysis of the hydrogen-rich carbon cycle oxygen blast furnace model, a relationship model between the tuyere-furnace gas injection and the upper gas distribution of the hydrogen-rich carbon cycle oxygen blast furnace is established. Based on the operating conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the tuyere-furnace gas injection is matched and adjusted to achieve the reasonable distribution and full utilization of the furnace gas injection amount of the hydrogen-rich carbon cycle oxygen blast furnace.

2. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 1, characterized in that: The method for adjusting the amount of coal gas injected into the furnace body specifically comprises the following steps: S1. Establish a hydrogen-rich carbon cycle oxygen blast furnace model; S2, using N2 and CO2 as gaseous media passing through the packed bed in the hydrogen-rich carbon cycle oxygen blast furnace model; S3. Based on the experimental data of the hydrogen-rich carbon cycle oxygen blast furnace model, the relationship between the penetration distance of the furnace body injected coal gas in the injection direction and the radius of the hydrogen-rich carbon cycle oxygen blast furnace is derived by regression analysis; S4. According to the experimental data analysis of the hydrogen-rich carbon cycle oxygen blast furnace model and in combination with the operating conditions of the hydrogen-rich carbon cycle oxygen blast furnace, the adjustment of the tuyere-furnace body coal gas injection amount is established.

3. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 2, characterized in that: The hydrogen-rich carbon cycle oxygen blast furnace model includes an air supply system, a model body and a data measurement system.

4. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 3, characterized in that: The air supply system includes a N2 gas source, a CO2 gas source and a gas mixing chamber; There are two N2 gas sources, one of which is connected to the furnace of the hydrogen-rich carbon cycle oxygen blast furnace through a gas pipeline; The other N2 gas source and the CO2 gas source are both connected to the gas mixing chamber through a gas pipeline, and the gas mixing chamber is connected to the furnace body of the hydrogen-rich carbon cycle oxygen blast furnace through a gas pipeline; A pressure valve is arranged on the gas pipeline.

5. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 4, characterized in that: The ratio of N2:CO2 in the mixing chamber is 1:

1.

6. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon circulating oxygen blast furnace according to claim 4, characterized in that: The data measurement system includes an electronic flow meter arranged on the gas pipeline and a gas analyzer arranged on the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace.

7. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 6, characterized in that: The furnace body of the hydrogen-rich carbon cycle oxygen blast furnace is provided with 9 rows of sampling holes, each row having 10 sampling holes; The gas analyzer takes samples from the sampling hole; The furnace body of the hydrogen-rich carbon circulating oxygen blast furnace is also provided with 5 auxiliary tuyere.

8. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 2, characterized in that: In the step S3, the relationship between the penetration distance of the coal gas injected into the furnace body in the injection direction and the radius of the hydrogen-rich carbon circulating oxygen blast furnace is B=R(0.8-0.85U / (U+V)); Where, B represents the distance on the center line of the auxiliary air outlet that has not been penetrated, unit: mm; R represents the radius of the blast furnace along the horizontal direction of the auxiliary tuyere of the furnace body, unit: mm; U represents the amount of gas injected into the furnace, unit: L / min; V represents the amount of gas rising from the lower part of the furnace body, unit: L / min.

9. The method for adjusting the amount of coal gas injected into the furnace body of a hydrogen-rich carbon cycle oxygen blast furnace according to claim 2, characterized in that: In step S4, establishing the adjustment of the tuyere-furnace body gas injection amount specifically includes: The injection volume of high-temperature upgraded coal gas at the lower tuyere is 600~700m 3 / t between; The gas temperature is between 1200 and 1250°C; The gas pressure is between 0.4 and 0.43 MPa; Adjust the gas injection volume of the furnace body to 100~200m 3 / t between; The gas temperature is between 900 and 950°C; The gas pressure is between 0.3 and 0.35 MPa; The wind speed at the furnace tuyere is between 20 and 30 m / s; Keep the proportion of furnace body injection gas in the total furnace body gas between 10% and 25%; Keep the depth of gas penetration in the furnace body between 0.90 and 1.25m.

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