Coal gas temperature and tempering device and method for combined injection of coke oven gas in hydrogen-carbon-rich circulating oxygen blast furnace

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a hydrogen-rich carbon circulation oxygen blast furnace coke oven gas combined injection coal gas temperature and quality adjusting device which comprises a hydrogen-rich carbon circulation oxygen blast furnace body, a dust remover, a decarburization tower and a heating furnace, the hydrogen-rich carbon circulation oxygen blast furnace body is communicated with the dust remover through a pipeline, the dust remover is communicated with the decarburization tower, and the heating furnace is communicated with the heating furnace. The decarburization tower is communicated with a decarburization gas pipe, the decarburization gas pipe is communicated with the gas inlet end of the heating furnace, the heating furnace is communicated with the hydrogen-rich carbon circulating oxygen blast furnace body, a bypass temperature adjusting pipe is communicated between the decarburization gas pipe and the hot air header pipe, and the bypass temperature adjusting pipe is communicated with a coke oven gas pipe. The method aims at solving the problems that checker bricks are eroded and the hydrogen-rich metallurgical carbon consumption of the blast furnace is increased along with the increase of the injection amount of coke oven gas during operation of the blast furnace. The aim of keeping the temperature of the outlet of the gas heating furnace constant is achieved by arranging the temperature-adjusting and tempering device, coke oven gas reforming is completed in the hot gas header pipe, and the aim of reducing carbon consumption by replacing carbon with hydrogen is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of blast furnace ironmaking, and in particular to a gas temperature regulating and tempering device and a temperature regulating and tempering method for composite injection of coke oven gas in a hydrogen-rich carbon circulating oxygen blast furnace. Background Art

[0002] In traditional blast furnace ironmaking, a blower heats air to about 1200°C through a hot blast furnace and then blows it into the blast furnace from the tuyere. In the tuyere area, the oxygen in the blast reacts with the coke and pulverized coal in the furnace to generate heat and reducing gas to heat the charge and reduce the ore. However, because more than 70% of the blast is nitrogen, the nitrogen content of the primary gas produced by the hearth reaction is high and the effective component of the reducing gas is low. If the smelting is intensified and the blast volume is increased, the amount of gas in the blast furnace bosh will be large, the permeability requirements of the blast furnace soft melting zone and the entire charge column will be increased, the quality requirements of raw materials, especially high-quality coke, will also be higher, and a large amount of nitrogen components in the top gas cannot be recycled, which is not conducive to carbon emission reduction. This has become a major technical bottleneck of blast furnaces.

[0003] In order to break through the technical bottleneck of traditional blast furnaces, the hydrogen-rich carbon cycle oxygen blast furnace adopts full oxygen smelting and top gas decarbonization cycle, which greatly reduces carbon emissions. In order to further reduce carbon emissions, the coke oven gas and decarbonized gas mixed injection technology is also implemented, using hydrogen in the coke oven gas as a reducing agent instead of carbon monoxide for smelting production. At present, the coke oven gas and decarbonized gas are premixed and then enter the gas heating furnace for heating. The coke gas is heated and cracked in the heating furnace before entering the blast furnace.

[0004] However, during the operation of the blast furnace, with the increase in the amount of coke oven gas injection, a large amount of carbon black is produced after the coke oven gas is cracked in the hot blast furnace, which seriously affects the long-term stable operation of the checkerboard bricks in the furnace. In addition, under high temperature, the temperature at the blast furnace inlet becomes unstable and cannot adapt to the gas heating requirements under different working conditions, resulting in an increase in the consumption of hydrogen-rich metallurgical carbon in the blast furnace. Summary of the invention

[0005] The purpose of the present invention is to provide a gas temperature control and tempering device and a temperature control and tempering method for a hydrogen-rich carbon circulating oxygen blast furnace compositely injected with coke oven gas, so as to solve the problem that during the operation of the blast furnace, as the amount of coke oven gas injected increases, not only the siliceous checker bricks are corroded, but also the blast furnace inlet temperature becomes unstable, resulting in an increase in the consumption of hydrogen-rich metallurgical carbon in the blast furnace.

[0006] In order to achieve the above-mentioned purpose, the basic scheme provided by the present invention is: a gas temperature regulating and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon circulating oxygen blast furnace, comprising a hydrogen-rich carbon circulating oxygen blast furnace body, a dust collector, a decarbonization tower and a heating furnace, wherein the top gas outlet end of the hydrogen-rich carbon circulating oxygen blast furnace body is connected to the gas inlet end of the dust collector through a pipeline, the gas outlet end of the dust collector is connected to the gas inlet end of the decarbonization tower, the gas outlet end of the decarbonization tower is connected to a decarbonization gas pipe, the decarbonization gas pipe is connected to the gas inlet end of the heating furnace, and the heating furnace is connected to a water vapor Steam nozzle, a temperature detector 1 is provided at the outlet end of the heating furnace, a hot air main is connected to the gas outlet end of the heating furnace, the hot air main is connected to the main body of the hydrogen-rich carbon circulating oxygen blast furnace, a temperature detector 2 is provided on the hot air main, a bypass temperature regulating pipe is connected between the decarbonized gas pipe and the hot air main, a coke oven gas pipe is connected to the bypass temperature regulating pipe, a valve group 1 is provided on the coke oven gas pipe, a valve group 2 is provided on the bypass temperature regulating pipe between the coke oven gas pipe and the hot air main, and the valve group 2 is electrically connected to the temperature detector 2.

[0007] The working principle of the present invention is that when composite injection of coke oven gas is required, the top output gas of the hydrogen-rich carbon circulating oxygen blast furnace body is first dedusted through a dust collector. After the dedusting is completed, the top gas enters the decarbonization tower for decarbonization treatment to form decarbonized gas, and then the decarbonized gas is introduced into the heating furnace through the decarbonization gas pipe for heating, and water vapor is sprayed into the heating furnace through the water vapor nozzle. At the same time, the coke oven gas is pressurized and then sprayed into the hot air main pipe through the bypass temperature regulating pipe. Then, the high-temperature decarbonized gas in the heating furnace enters the hot air main pipe after reaching the temperature. The coke oven gas sprayed into the hot air main pipe undergoes a cracking reaction with the high-temperature water vapor and the residual part of CO2 in the decarbonized gas, completing the cooling and tempering of the decarbonized gas, forming a highly reducing hydrogen-rich mixed coal gas that enters the hydrogen-rich carbon circulating oxygen blast furnace body.

[0008] The beneficial effects of the present invention are as follows: by setting a temperature regulating and tempering device, the goal of maintaining a constant outlet temperature of a gas heating furnace is achieved, while at the same time, the effect of a large amount of coke oven gas entering the gas heating furnace on the heating furnace is well solved; by maximally heating the decarbonized gas, the reforming of the coke oven gas is completed in the hot gas main pipe, so as to achieve blast furnace hydrogen-enriched metallurgy and reduce carbon consumption by replacing carbon with hydrogen; and by injecting steam into the low-temperature area of ​​the heating furnace, the technical problem of poor humidification effect on the cold gas pipeline due to the low temperature of the decarbonized gas in the existing gas heating furnace is solved; and by effectively adding steam, conditions are provided for hydrogen-enriched metallurgy of a larger amount of coke oven gas; under normal circumstances, the coke oven gas enters the bypass temperature regulating pipe and is mixed with the high-temperature decarbonized gas, and does not enter the heating furnace, thereby avoiding erosion of the checker bricks in the heating furnace.

[0009] Option 2, which is the preferred option of the basic option, is that the coke oven gas pipe is connected to a nitrogen purge pipe; a nitrogen purge pipe is provided on the coke oven gas pipe to facilitate purging nitrogen into the pipe when an abnormal situation occurs in the blast furnace, thereby maintaining a stable pressure in the coke oven gas pipe.

[0010] Option three is the preferred option of the basic option. Both valve group one and valve group two include a shut-off valve, a flow regulating valve, a flow meter, a thermometer and a pressure regulating valve. By setting the shut-off valve, the flow of gas in the pipeline can be completely shut off during pipeline maintenance. The flow regulating valve can accurately adjust the gas flow rate according to actual needs. The flow meter can detect the flow rate of gas in the pipeline in real time and provide accurate flow data for operators. The thermometer of the same specification can accurately measure the temperature of gas in the coke oven gas pipe. The pressure regulating valve can be used to adjust the coke oven gas pressure in the coke oven gas pipe to keep the coke oven gas pressure within the set range.

[0011] Scheme 4, which is the preferred embodiment of schemes 1 to 3, comprises the following steps:

[0012] S1, firstly, the coal gas output from the top of the hydrogen-rich carbon circulating oxygen blast furnace is dedusted by a dust collector;

[0013] S2, after the dust removal is completed, the top gas enters the decarbonization tower to remove carbon dioxide to form decarbonized gas;

[0014] S3, passing the decarbonized coal gas into the heating furnace through the decarbonized coal gas pipe for heating, and spraying water vapor into the heating furnace through the water vapor nozzle. The heating temperature of the decarbonized coal gas is 1250-1450°C. At the same time, the coke oven gas is pressurized and sprayed into the hot air main pipe through the bypass temperature regulating pipe;

[0015] S4, after the high-temperature decarbonized coal gas is heated, it enters the hot blast main pipe, and the coke oven gas injected into the hot blast main pipe undergoes cracking reaction with the high-temperature water vapor and residual CO2 in the decarbonized coal gas, completing the cooling and tempering of the decarbonized coal gas, forming a highly reducing hydrogen-rich mixed coal gas that enters the hydrogen-rich carbon circulating oxygen blast furnace body; the coal gas output from the top of the hydrogen-rich carbon circulating oxygen blast furnace body is dedusted by a dust collector, so as to improve the purity of the top coal gas and avoid these impurities from causing wear to the equipment during subsequent processing; the top coal gas is decarbonized to reduce carbon emissions and improve the reducibility of the coal gas; the decarbonized coal gas is introduced into the heating furnace through the decarbonized coal gas pipe for heating, and water vapor is sprayed into it, and at the same time, the coke oven gas By spraying the decarbonized coal gas into the hot air main through the bypass thermostatic pipe, the decarbonized coal gas can be heated to the maximum extent, and the reforming of the coke oven gas is completed in the hot gas main. In addition, by spraying steam in the low-temperature area of ​​the heating furnace, the problem of poor humidification effect on the cold gas pipeline of the existing gas heating furnace due to the low temperature of the decarbonized coal gas is avoided. The coke oven gas is also sprayed into the hot air main through the bypass thermostatic pipe, which not only prevents the erosion of the coke oven gas to the checker bricks of the heating furnace, but also dynamically adjusts the temperature through the bypass thermostatic pipe to keep the blast furnace inlet temperature constant. After the high-temperature decarbonized coal gas is heated, it enters the hot air main, which is convenient for adjusting the composition of the coal gas through cracking reaction to make it highly reducing and hydrogen-rich, thereby achieving the goal of replacing carbon with hydrogen.

[0016] Scheme 5 is the preferred option of Scheme 4. In S3, the coke oven gas is pressurized from the original 0.015Mpa to 0.5-0.8Mpa. Pressurizing the coke oven gas to 0.5-0.8Mpa can enable the coke oven gas to overcome resistance in the pipeline and achieve long-distance transportation. If the pressure is greater than 0.8Mpa, it exceeds the bearing capacity of equipment such as pipelines, valves and connectors, and these equipment are prone to leakage. If the pressure is less than 0.5Mpa, the pressure of the coke oven gas is close to the pressure of the decarbonized gas, not only will the decarbonized gas enter the bypass temperature regulating pipe, but the flow rate of the coke oven gas in the pipeline will also be reduced, and the amount of coke oven gas injection cannot be controlled.

[0017] Option six is ​​the preferred option of option four. In S3, water vapor is sprayed into the heating furnace within the temperature range of 100-300°C. The temperature range of the water vapor sprayed is set to 100-300°C, which has the best effect in preventing carbon deposition. If the water vapor is sprayed when the temperature is greater than 300°C, the refractory material of the heating furnace will be damaged. If the temperature is less than 100°C, the effect of preventing carbon deposition is poor.

[0018] Scheme 7 is the preferred option of Scheme 4. In S4, in order to reduce hydrogen-rich metallurgy, when it is necessary to reduce the amount of coke oven gas and meet the final temperature requirement, the opening of valve group 1 on the coke oven gas pipe is reduced to reduce the amount of coke oven gas entering the furnace. At the same time, the decarbonized gas is supplemented into the bypass temperature regulating pipe to ensure the constant temperature of the gas pipeline. When the amount of coke oven gas is small and the target temperature required for blast furnace ironmaking cannot be reached, the low-temperature decarbonized gas directly enters the high-temperature gas pipeline through the bypass, which can ensure that the high-temperature decarbonized gas temperature is stable at the target temperature and prevent the high-temperature decarbonized gas temperature from fluctuating sharply, resulting in fluctuations in furnace conditions.

[0019] Scheme 8 is the preferred option of Scheme 4. In S4, in order to increase hydrogen-rich metallurgy, when the amount of coke oven gas needs to be increased and the final temperature requirement needs to be met, the opening of valve group 1 on the coke oven gas pipe is increased to increase the amount of coke oven gas entering the furnace, and the injection amount of decarbonized gas into the bypass temperature regulating pipe is simultaneously reduced until the decarbonized gas is blocked from entering the bypass temperature regulating pipe. The opening of valve group 1 on the coke oven gas pipe is continued to be increased to increase the amount of coke oven gas entering the furnace. At this time, the amount of coke oven gas in the bypass temperature regulating pipe increases, so a part of the coke oven gas enters the heating furnace, thereby ensuring the constant temperature of the gas pipeline; by increasing the amount of coke oven gas, the purpose of maximizing hydrogen-rich smelting and reducing carbon consumption is achieved, while the effect of carbon deposition in the furnace after the coke oven gas enters the heating furnace is reduced.

[0020] Option nine is the preferred option of option four, seven or eight. When the temperature detected by temperature monitor two is too low or too high, valve group two on the bypass thermostatic pipe is dynamically adjusted by controlling the valve group two. By dynamically adjusting valve group two, the temperature of the gas pipeline can be kept constant to prevent fluctuations in furnace conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention discloses a flow chart of a gas temperature regulating and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon circulating oxygen blast furnace. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below through specific embodiments:

[0023] The figure marks in the drawings of the specification include: 1. Hydrogen-rich carbon circulating oxygen blast furnace body; 2. Dust collector; 3. Decarbonization tower; 4. Heating furnace; 5. Decarbonization gas pipe; 6. Water vapor nozzle; 7. Temperature detector one; 8. Hot air main pipe; 9. Temperature detector two; 10. Bypass temperature regulating pipe; 11. Coke oven gas pipe; 12. Valve group two; 13. Nitrogen purge pipe; 14. Valve group one.

[0024] Example 1

[0025] like Figure 1As shown: a gas temperature regulating and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon cycle oxygen blast furnace, comprising a hydrogen-rich carbon cycle oxygen blast furnace body 1, a dust collector 2, a decarbonization tower 3 and a heating furnace 4, the top gas outlet end of the hydrogen-rich carbon cycle oxygen blast furnace body 1 is connected to the gas inlet end of the dust collector 2 through a pipeline, the gas outlet end of the dust collector 2 is connected to the gas inlet end of the decarbonization tower 3, the gas outlet end of the decarbonization tower 3 is connected to a decarbonization gas pipe 5, the decarbonization gas pipe 5 is connected to the gas inlet end of the heating furnace 4, the heating furnace 4 is connected to a water vapor nozzle 6, the outlet end of the heating furnace 4 is provided with a temperature detector 7, the gas outlet end of the heating furnace 4 is connected to a hot air main pipe 8, the hot air main pipe 8 is connected to the hot air main pipe 9, and the hot air main pipe 10 is connected to the hot air main pipe 11. Pipe 8 is connected with the hydrogen-rich carbon circulating oxygen blast furnace body 1, and a temperature detector 2 9 is arranged on the hot air main pipe 8. A bypass temperature regulating pipe 10 is connected between the decarbonized gas pipe 5 and the hot air main pipe 8, and a coke oven gas pipe 11 is connected to the bypass temperature regulating pipe 10. A valve group 14 is arranged on the coke oven gas pipe 11, and a valve group 2 12 is arranged on the bypass temperature regulating pipe 10 between the coke oven gas pipe 11 and the hot air main pipe 8. Both valve group 14 and valve group 2 12 include a shut-off valve, a flow regulating valve, a flow meter, a thermometer and a pressure regulating valve. Valve group 2 12 is electrically connected with temperature detector 2 9, and a nitrogen purge pipe 13 is connected to the coke oven gas pipe 11.

[0026] The implementation method of this embodiment is as follows: when composite injection of coke oven gas is required, the top output gas of the hydrogen-rich carbon circulating oxygen blast furnace body 1 is first dedusted through the dust collector 2. After the dedusting is completed, the top gas enters the decarbonization tower 3 for decarbonization treatment to form decarbonized gas, and then the decarbonized gas is introduced into the heating furnace 4 through the decarbonization gas pipe 5 for heating, and water vapor is sprayed into the heating furnace 4 through the water vapor nozzle 6. At the same time, the coke oven gas is pressurized and then sprayed into the hot air main pipe 8 through the bypass temperature regulating pipe 10. Then, the high-temperature decarbonized gas in the heating furnace 4 enters the hot air main pipe 8 after reaching the temperature. The coke oven gas sprayed into the hot air main pipe 8 undergoes a cracking reaction with the high-temperature water vapor and the residual part of CO2 in the decarbonized gas, completing the cooling and tempering of the decarbonized gas, forming a highly reducing hydrogen-rich mixed coal gas that enters the hydrogen-rich carbon circulating oxygen blast furnace body 1.

[0027] Example 2

[0028] A temperature control and conditioning method for a gas temperature control and conditioning device for a hydrogen-rich carbon circulating oxygen blast furnace composite injection of coke oven gas, comprising the following steps:

[0029] S1, first, the coal gas output from the top of the hydrogen-rich carbon circulating oxygen blast furnace body 1 is dedusted through the dust collector 2;

[0030] S2, after the dust removal is completed, the top gas enters the decarbonization tower 3 to remove carbon dioxide to form decarbonized gas;

[0031] S3, the decarbonized coal gas is introduced into the heating furnace 4 through the decarbonized coal gas pipe 5 for heating, and water vapor is sprayed into the decarbonized coal gas heated to 250° C. in the heating furnace 4 through the water vapor nozzle 6. The heating temperature of the decarbonized coal gas is 1400° C. At the same time, the coke oven gas is pressurized from the original 0.015 MPa to 0.6 MPa, and then sprayed into the hot air main pipe 8 through the bypass temperature regulating pipe 10. The pressure of the coke oven gas is greater than the pressure of the decarbonized gas;

[0032] S4, after the high-temperature decarbonized coal gas is heated, it enters the hot air main pipe 8, and the coke oven gas injected into the hot air main pipe 8 undergoes cracking reaction with the high-temperature water vapor and residual CO2 in the decarbonized coal gas, completing the cooling and tempering of the decarbonized coal gas, forming a highly reducing hydrogen-rich mixed coal gas that enters the hydrogen-rich carbon circulating oxygen blast furnace body 1; in order to reduce hydrogen-rich metallurgy, when it is necessary to reduce the amount of coke oven gas and meet the final temperature requirement, the opening of the valve group 14 on the coke oven gas pipe 11 is reduced to reduce the amount of coke oven gas entering the furnace, and at the same time, the decarbonized coal gas is supplemented into the bypass temperature regulating pipe 10 to ensure the constant temperature of the gas pipeline; in order to increase hydrogen-rich metallurgy, when it is necessary to increase the amount of coke oven gas When the amount of gas needs to be increased and the final temperature requirement needs to be met, the opening of the valve group 14 on the coke oven gas pipe 11 is increased to increase the amount of coke oven gas entering the furnace, and the injection amount of decarbonized gas into the bypass thermostatic pipe 10 is simultaneously reduced, until the decarbonized gas is blocked from entering the bypass thermostatic pipe 10, the opening of the valve group 14 on the coke oven gas pipe 11 is continued to be increased to increase the amount of coke oven gas entering the furnace. At this time, the amount of coke oven gas in the bypass thermostatic pipe 10 increases, so a part of the coke oven gas enters the heating furnace 4 to ensure the constant temperature of the gas pipeline; when the temperature detected by the temperature monitor 29 is too low or too high, it is dynamically adjusted by controlling the valve group 2 12 on the bypass thermostatic pipe 10.

[0033] Through the above method, the goal of constant outlet temperature of the gas heating furnace was achieved through industrial application in a 430 cubic meter hydrogen-rich carbon circulating oxygen blast furnace. At the same time, the impact of a large amount of coke oven gas entering the gas heating furnace on the heating furnace was well solved. By maximally heating the decarbonized gas, the reforming of the coke oven gas was completed in the hot gas main, achieving the purpose of blast furnace hydrogen-rich metallurgy and reducing carbon consumption by replacing carbon with hydrogen. The injection volume of coke oven gas per ton of iron exceeded 200m 3 / t, thereby reducing the solid fuel ratio by 80kg / t, which has significant effects in terms of carbon reduction and operating cost reduction.

[0034] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A gas temperature and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon circulating oxygen blast furnace, characterized in that: The invention comprises a hydrogen-rich carbon circulating oxygen blast furnace body (1), a dust collector (2), a decarbonization tower (3) and a heating furnace (4), wherein the top gas outlet end of the hydrogen-rich carbon circulating oxygen blast furnace body (1) is connected to the gas inlet end of the dust collector (2) through a pipeline, the gas outlet end of the dust collector (2) is connected to the gas inlet end of the decarbonization tower (3), the gas outlet end of the decarbonization tower (3) is connected to a decarbonization coal gas pipe (5), the decarbonization coal gas pipe (5) is connected to the gas inlet end of the heating furnace (4), the heating furnace (4) is connected to a water vapor nozzle (6), the outlet end of the heating furnace (4) is provided with a temperature detector (7), the gas outlet end of the heating furnace (4) is connected to a water vapor nozzle (6), the outlet end of the heating furnace (4) is provided with a temperature detector (7), the outlet end of the heating furnace (4) is connected to a water vapor nozzle (6), the outlet end of the heating furnace (4) is provided with ... The end is connected to a hot air main pipe (8), the hot air main pipe (8) is connected to the hydrogen-rich carbon circulating oxygen blast furnace body (1), the hot air main pipe (8) is provided with a second temperature detector (9), a bypass temperature regulating pipe (10) is connected between the decarbonized coal gas pipe (5) and the hot air main pipe (8), the bypass temperature regulating pipe (10) is connected to a coke oven gas pipe (11), the coke oven gas pipe (11) is provided with a valve group one (14), the bypass temperature regulating pipe (10) between the coke oven gas pipe (11) and the hot air main pipe (8) is provided with a valve group two (12), the valve group two (12) is electrically connected to the second temperature detector (9).

2. The gas temperature regulating and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon cycle oxygen blast furnace according to claim 1 is characterized in that: The coke oven gas pipe (11) is connected to a nitrogen purge pipe (13).

3. The gas temperature control and tempering device for the hydrogen-rich carbon cycle oxygen blast furnace composite injection of coke oven gas according to claim 1, characterized in that: The valve group 1 (14) and the valve group 2 (12) both include a cut-off valve, a flow regulating valve, a flow meter, a thermometer and a pressure regulating valve.

4. The temperature control and tempering method of the gas temperature control and tempering device for the combined injection of coke oven gas from a hydrogen-rich carbon cycle oxygen blast furnace according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, first, the coal gas output from the top of the hydrogen-rich carbon circulating oxygen blast furnace body (1) is dedusted by a dust collector (2); S2, after the dust removal is completed, the top gas enters the decarbonization tower (3) to remove carbon dioxide to form decarbonized gas; S3, passing the decarbonized coal gas through the decarbonized coal gas pipe (5) into the heating furnace (4) for heating, and spraying water vapor into the heating furnace (4) through the water vapor nozzle (6), the heating temperature of the decarbonized coal gas is 1250-1450° C. At the same time, after pressurizing the coke oven gas, it is sprayed into the hot air main pipe (8) through the bypass temperature regulating pipe (10); S4, after the high-temperature decarbonized coal gas is heated, it enters the hot air main pipe (8), and the coke oven gas injected into the hot air main pipe (8) undergoes cracking reaction with the high-temperature water vapor and residual CO2 in the decarbonized coal gas, completing the cooling and tempering of the decarbonized coal gas, forming a highly reducing hydrogen-rich mixed coal gas that enters the hydrogen-rich carbon circulating oxygen blast furnace body (1).

5. The temperature control and tempering method of a gas temperature control and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon cycle oxygen blast furnace according to claim 4, characterized in that: In S3, the coke oven gas is pressurized from the original 0.015Mpa to 0.5-0.8Mpa.

6. The temperature control and tempering method of a gas temperature control and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon cycle oxygen blast furnace according to claim 4, characterized in that: In S3, water vapor is injected into the decarbonized coal gas heated to 100-300°C in the heating furnace (4).

7. The method for temperature control and tempering of a gas temperature control and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon cycle oxygen blast furnace according to claim 4, characterized in that: In S4, in order to reduce hydrogen-rich metallurgy, when the amount of coke oven gas needs to be reduced and the final temperature requirement needs to be met, the opening of valve group 1 (14) on the coke oven gas pipe (11) is adjusted to reduce the amount of coke oven gas entering the furnace. At the same time, decarbonized gas is supplemented into the bypass temperature regulating pipe (10) to ensure the constant temperature of the gas pipeline.

8. The temperature control and tempering method of a gas temperature control and tempering device for composite injection of coke oven gas in a hydrogen-rich carbon cycle oxygen blast furnace according to claim 4, characterized in that: In S4, in order to increase hydrogen-rich metallurgy, when the amount of coke oven gas needs to be increased and the final temperature requirement needs to be met, the opening of the valve group 1 (14) on the coke oven gas pipe (11) is increased to increase the amount of coke oven gas entering the furnace, and the injection amount of decarbonized gas into the bypass temperature regulating pipe (10) is simultaneously reduced until the decarbonized gas is blocked from entering the bypass temperature regulating pipe (10). The opening of the valve group 1 (14) on the coke oven gas pipe (11) is further increased to increase the amount of coke oven gas entering the furnace. At this time, the amount of coke oven gas in the bypass temperature regulating pipe (10) increases, so a part of the coke oven gas enters the heating furnace (4), thereby ensuring the constant temperature of the gas pipeline.

9. The temperature control and tempering method of the gas temperature control and tempering device for the hydrogen-rich carbon cycle oxygen blast furnace composite injection of coke oven gas according to claim 4, 7 or 8, characterized in that: When the temperature detected by the second temperature monitor (9) is too low or too high, dynamic adjustment is performed by controlling the second valve group (12) on the bypass temperature regulating pipe (10).

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