CN115058548B - Ultrasonic hydrogen injection system based on Raoult nozzle and control method - Google Patents
Ultrasonic hydrogen injection system based on Raoult nozzle and control method Download PDFInfo
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- CN115058548B CN115058548B CN202210609779.1A CN202210609779A CN115058548B CN 115058548 B CN115058548 B CN 115058548B CN 202210609779 A CN202210609779 A CN 202210609779A CN 115058548 B CN115058548 B CN 115058548B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B2005/005—Selection or treatment of the reducing gases
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Abstract
A supersonic hydrogen injection system based on a Raoult nozzle and a control method thereof are provided, wherein the Raoult nozzle is used for injecting hydrogen into a blast furnace in a supersonic mode, the hydrogen is subjected to diffusion combustion in an oxygen-enriched hot air environment in a turbulent flame mode, the reaction rate is low, the local heat release is less, the heat flow distribution is uniform, the combustion peak temperature is low, compared with the traditional straight pipe hydrogen injection local high-temperature combustion, the reaction is carried out in a large area, even the whole blowpipe, the flame front disappears, and the thermal state burning loss of the local heat release of the hydrogen combustion to the outlet of a spray gun can be effectively avoided; meanwhile, a protective gas pipeline is assisted outside the Raoult spray pipe, and inert gases such as nitrogen are introduced, so that the rapid combustion of hydrogen in a local area of an outlet of the spray gun is further avoided. The invention is suitable for the blast furnace hydrogen injection iron making process, can effectively prolong the service life of the hydrogen spray gun, reduce the spray gun replacement times in the blast furnace hydrogen injection process, and promote the popularization and application of the blast furnace hydrogen-rich smelting technology.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking and hydrogen injection, and particularly relates to a supersonic hydrogen injection system based on a Raoult nozzle and a control method.
Background
Under the background of coping with climate change and energy transformation, development and utilization of non-carbon and low-carbon energy are highly paid attention to all countries, and the development and utilization of non-carbon and low-carbon energy are centered on reduction of carbon footprint and reduction of carbon emissionIs becoming increasingly interesting to the iron and steel industry. Hydrogen energy is regarded as the most potential clean energy source in 21 st century, hydrogen is used for replacing part of carbonaceous raw materials (coke and coal dust) as fuel and reducing agent of metal oxide in the process of smelting molten pig iron in a blast furnace, and compared with the traditional carbon metallurgy, the reaction product is formed by using greenhouse gas CO 2 The water is converted into water, so that the carbon emission of the steel production process is fundamentally reduced, and the water is one of effective ways for realizing green low-carbon sustainable development by optimizing the energy structure and the process flow of the steel industry.
At present, in the steel smelting process, hydrogen is mainly blown into a blast furnace by a hydrogen blowing device at a tuyere or a hydrogen-rich gas blowing device at the lower part of a furnace body, but the hydrogen is used as a very easy-to-burn gas, and in the high-oxidability atmosphere environment of a hot air belly pipe, the hydrogen at the outlet position of a spray gun is quickly burned and emits a large amount of heat, so that the spray head area of the hydrogen spray gun is very easy to burn; meanwhile, the traditional blast furnace hydrogen spray gun adopts a straight pipe form, and the local area of the spray gun outlet has higher hydrogen concentration, so that the area is easy to generate hydrogen deflagration, and the safe and stable operation of a blast furnace hydrogen spray system is seriously influenced.
Therefore, how to improve the existing blast furnace hydrogen injection system and combine the corresponding hydrogen injection control method, ensure that the hydrogen spray gun is not easy to burn in the tuyere belly pipe and the convolution area with high temperature and high oxidizing property and maintain longer service life, and is a key technical problem to be solved urgently in the existing blast furnace hydrogen-rich smelting.
Disclosure of Invention
In order to solve the problems, the invention provides a supersonic hydrogen injection system based on a Raoult nozzle and a control method thereof, hydrogen is input into a blast furnace from a spray gun outlet in a supersonic mode based on the Raoult nozzle, and the hydrogen is subjected to volume combustion or dispersion combustion in a hot air environment in a turbulent flame mode, and the supersonic hydrogen injection system is characterized by low reaction rate, less local heat release, uniform heat flow distribution, low combustion peak temperature and extremely low noise; according to the actual smelting working condition of the blast furnace, when the set injection flow of the hydrogen is smaller and insufficient to reach supersonic speed according to the actual smelting working condition, the main injection flow is supplemented with nitrogen to maintain sufficient gas pressure at the front end of the Raoult nozzle; meanwhile, the outside of the Raoult spray pipe is assisted with a protective gas spray pipe, inert gases such as nitrogen are introduced, on one hand, the oxygen concentration of the outlet area of the spray gun is reduced, the effect of removing fire of the hydrogen jet is achieved, meanwhile, the length of the core area of the supersonic jet can be prolonged by the protective gas, and the combustion range of the hydrogen is further enlarged.
The technical scheme of the invention is as follows:
the supersonic hydrogen injection system based on the Raoult nozzle is characterized by comprising a Raoult nozzle body and a protective gas nozzle body sleeved on the Raoult nozzle body, wherein an annular gap is reserved between the outer surface of the Raoult nozzle body and the inner surface of the protective gas nozzle body to form a protective gas channel, an injection port of the Raoult nozzle body and an injection circumferential seam port of the protective gas nozzle body are in coaxial relation, an inlet end of the Raoult nozzle body is respectively connected with an output end of a hydrogen control valve group and an output end of a main injection inert gas control valve group through a three-way pipeline, an inlet end of the protective gas nozzle body is connected with an output end of the protective gas control valve group, an input end of the protective gas control valve group and an input end of the main injection inert gas control valve group are both connected with an inert gas source, an input end of the hydrogen control valve group is connected with a hydrogen source, and an inlet end of the Raoult nozzle body is provided with a pipeline gas pressure sensor to control the flow rate of supersonic jet formed by the injection port.
The inert gas adopts nitrogen and/or argon, and the volume fraction of oxygen in the inert gas is less than 5%.
The protective gas jet flow of the injection circular seam port reduces the oxygen concentration in the injection port area on one hand, achieves the effect of removing fire of the hydrogen jet flow, and prolongs the length of the supersonic jet flow core area on the other hand so as to enlarge the combustion range of the hydrogen in the hearth of the iron-making blast furnace.
The pipeline gas pressure sensor, the main blowing inert gas control valve group, the hydrogen control valve group and the shielding gas control valve group are respectively connected with the upper computer, so that supersonic jet is formed at the blowing port after the hydrogen and the main blowing inert gas are converged, and the shielding gas reaches preset flow and flow velocity at the blowing circumferential seam port.
The speed of the supersonic jet is Mach 1-2.
The injection port of the Raoult nozzle body is sequentially provided with an expansion section, a throat section and a contraction section inwards, the inlet diameter of the contraction section is 58 mm+/-10%, the half cone angle is 22 DEG+/-10%, the diameter of the throat section is 29 mm+/-10%, the length is 8 mm+/-10%, the outlet diameter of the expansion section is 31 mm+/-10%, and the half cone angle is 5 DEG+/-10%.
The application of a supersonic hydrogen injection system based on a Raoult nozzle in blast furnace ironmaking is used for injecting hydrogen into a blast furnace hearth from a tuyere of a blast furnace.
A control method of a supersonic hydrogen injection system based on a Raoult nozzle is characterized by comprising the following modes:
non-hydrogen injection mode: when the blowing system does not spray hydrogen in the blast furnace smelting process, the Raoult spray pipes and the protective gas spray pipes are all filled with inert gas;
hydrogen spraying mode: after hydrogen injection is started, inputting a set hydrogen injection flow into a control system, automatically adjusting the opening of a valve by a flow controller in a hydrogen control valve group, adjusting the hydrogen injection flow to the set flow, and injecting inert gas by a protective gas spray pipe;
monitoring the gas pressure of a pipeline in real time, and maintaining the existing operation unchanged when the gas pressure at the front end of the Raoult nozzle is larger than or equal to the Mach number critical pressure set by the Raoult nozzle; when the gas pressure at the front end of the Raoult nozzle is smaller than the set Mach number critical pressure, the control system automatically opens the quick cut-off valve of the main blowing inert gas pipeline control valve bank, and simultaneously adjusts the flow controller in the main blowing inert gas control valve bank, and adjusts the opening of the valve until the gas pressure at the front end of the Raoult nozzle is equal to the set Mach number critical pressure.
In the non-hydrogen injection mode, the flow rate of the inert gas in the Raoult nozzleIn the range of 500 to 2000Nm 3 And/h, the inert gas flow rate of the protective gas spray pipe ranges from 200Nm to 800Nm 3 /h；
In the hydrogen spraying mode, the flow rate of the hydrogen gas of the Raoult nozzle ranges from 0 to 2500Nm 3 And/h, the flow rate of the inert gas of the Raoult nozzle ranges from 0 to 1500Nm respectively 3 And/h, the inert gas flow ranges of the protective gas spraying pipes are respectively 200-800Nm 3 /h。
The invention has the following technical effects: according to the supersonic hydrogen injection system and the control method based on the Raoult nozzle, the Raoult nozzle is used for injecting hydrogen into the blast furnace in a supersonic mode, the hydrogen is subjected to diffusion combustion in an oxygen-enriched hot air environment in a turbulent flame mode, the reaction rate is low, local heat release is less, the heat flow distribution is uniform, the combustion peak temperature is low, compared with the traditional straight pipe hydrogen injection local high-temperature combustion, the reaction is carried out in a large area, even the whole blowpipe, the flame front disappears, and the thermal state burning loss of the local heat release of the hydrogen combustion to the outlet of the spray gun can be effectively avoided; meanwhile, a protective gas pipeline is assisted outside the Raoult spray pipe, and inert gases such as nitrogen are introduced, so that the rapid combustion of hydrogen in a local area of an outlet of the spray gun is further avoided. The invention is suitable for the blast furnace hydrogen injection iron making process, can effectively prolong the service life of the hydrogen spray gun, reduce the spray gun replacement times in the blast furnace hydrogen injection process, and promote the popularization and application of the blast furnace hydrogen-rich smelting technology.
Drawings
FIG. 1 is a schematic diagram of a supersonic hydrogen injection system based on a Raoult nozzle embodying the present invention.
The reference numerals are listed below: 1-a hydrogen gas source; 2-an inert gas source (comprising nitrogen and/or argon, the oxygen volume fraction in the inert gas being < 5%); 3-a hydrogen control valve group; 4-main inert gas blowing control valve group; 5-a protective gas control valve group; 6-three-way pipeline; 7-a pipeline gas pressure sensor; 8-Raoult nozzle gas inlet; 9-a protective gas jet pipe gas inlet; 10-Raoult nozzle; 11-a protective gas spray pipe.
Detailed Description
The invention is described below with reference to the accompanying drawings (fig. 1) and examples.
FIG. 1 is a schematic diagram of a supersonic hydrogen injection system based on a Raoult nozzle embodying the present invention. Referring to fig. 1, a supersonic hydrogen injection system based on a raoult nozzle comprises a raoult nozzle 10 pipe body and a protective gas nozzle 11 pipe body sleeved on the raoult nozzle 10 pipe body, wherein an annular gap is reserved between the outer surface of the raoult nozzle pipe body and the inner surface of the protective gas nozzle pipe body to form a protective gas channel, an injection port of the raoult nozzle pipe body and an injection circular gap port of the protective gas nozzle pipe body are in coaxial relation, an inlet end of the raoult nozzle pipe body is respectively connected with an output end of a hydrogen control valve group 3 and an output end of a main injection inert gas control valve group 4 through a tee pipeline 6, an inlet end of the protective gas nozzle pipe body is connected with an output end of a protective gas control valve group 5 (through a protective gas nozzle gas inlet 9), an input end of the protective gas control valve group 5 and an input end of the main injection inert gas control valve group 4 are both connected with an inert gas source 2, an input end of the hydrogen control valve group 3 is connected with a hydrogen source 1, and an inlet end of the raoult nozzle pipe body is provided with a pipeline gas pressure 7 (through a raoult nozzle gas inlet 8) to control the flow rate of the supersonic hydrogen injection system.
The inert gas adopts nitrogen and/or argon, and the volume fraction of oxygen in the inert gas is less than 5%. The protective gas jet flow of the injection circular seam port reduces the oxygen concentration in the injection port area on one hand, achieves the effect of removing fire of the hydrogen jet flow, and prolongs the length of the supersonic jet flow core area on the other hand so as to enlarge the combustion range of the hydrogen in the hearth of the iron-making blast furnace. The pipeline gas pressure sensor 7, the main blowing inert gas control valve group 4, the hydrogen control valve group 3 and the shielding gas control valve group 5 are respectively connected with an upper computer, so that supersonic jet flow is formed at the blowing port after the hydrogen and the main blowing inert gas are converged, and the shielding gas reaches preset flow and flow velocity at the blowing circumferential seam port. The speed of the supersonic jet is Mach 1-2. The spraying port of the Raoult spray pipe 10 pipe body is inwards provided with an expansion section, a throat section and a contraction section in sequence, the inlet diameter of the contraction section is 58 mm+/-10%, the half cone angle is 22 DEG+/-10%, the diameter of the throat section is 29 mm+/-10%, the length is 8 mm+/-10%, the outlet diameter of the expansion section is 31 mm+/-10%, and the half cone angle is 5 DEG+/-10%.
The application of a supersonic hydrogen injection system based on a Raoult nozzle in blast furnace ironmaking is used for injecting hydrogen into a blast furnace hearth from a tuyere of a blast furnace.
A control method of a supersonic hydrogen injection system based on a Raoult nozzle is characterized by comprising the following modes: non-hydrogen injection mode: when the blowing system does not spray hydrogen in the blast furnace smelting process, the Raoult spray pipes and the protective gas spray pipes are all filled with inert gas; hydrogen spraying mode: after hydrogen injection is started, inputting a set hydrogen injection flow into a control system, automatically adjusting the opening of a valve by a flow controller in a hydrogen control valve group, adjusting the hydrogen injection flow to the set flow, and injecting inert gas by a protective gas spray pipe; monitoring the gas pressure of a pipeline in real time, and maintaining the existing operation unchanged when the gas pressure at the front end of the Raoult nozzle is larger than or equal to the Mach number critical pressure set by the Raoult nozzle; when the gas pressure at the front end of the Raoult nozzle is smaller than the set Mach number critical pressure, the control system automatically opens the quick cut-off valve of the main blowing inert gas pipeline control valve bank, and simultaneously adjusts the flow controller in the main blowing inert gas control valve bank, and adjusts the opening of the valve until the gas pressure at the front end of the Raoult nozzle is equal to the set Mach number critical pressure.
In the non-hydrogen spraying mode, the flow rate of the inert gas of the Raoult nozzle ranges from 500 to 2000Nm 3 And/h, the inert gas flow rate of the protective gas spray pipe ranges from 200Nm to 800Nm 3 /h; in the hydrogen spraying mode, the flow rate of the hydrogen gas of the Raoult nozzle ranges from 0 to 2500Nm 3 And/h, the flow rate of the inert gas of the Raoult nozzle ranges from 0 to 1500Nm respectively 3 And/h, the inert gas flow ranges of the protective gas spraying pipes are respectively 200-800Nm 3 /h。
A supersonic hydrogen injection system based on a Raoult nozzle comprises an injection device, a gas supply system and a control system.
The blowing device consists of a Raoult nozzle 10 and a protective gas nozzle 11.
The gas supply system comprises a hydrogen gas source 1, an inert gas source 2, a hydrogen pipeline and control valve group 3, a main inert gas blowing pipeline and control valve group 4 and a protective gas pipeline and control valve group 5.
The control system comprises a pipeline gas pressure sensor 7 and an upper computer.
A supersonic hydrogen spraying system based on a Raoult spray pipe comprises an expansion section, a throat section and a contraction section, wherein a supersonic jet can be formed at the outlet of the spray pipe when the sprayed gas reaches a critical pressure; an annular gap is reserved between the protective gas spray pipe and the Raoult spray pipe to form a protective gas channel, and the Raoult spray pipe and the protective gas spray pipe are in coaxial relation.
The hydrogen gas source 1 is connected with the hydrogen control valve group 3 through a pipeline, the inert gas source 2 is connected with the main blowing inert gas control valve group 4 through a pipeline, then the three-way pipeline 6 is used for converging the hydrogen and the main blowing inert gas and then is connected to the Raoult nozzle gas inlet 8, and the pipeline gas temperature and pressure sensor 7 is also arranged on the pipeline at the gas output end of the three-way pipeline.
The shielding gas source 2 is connected with the shielding gas control valve group 5 through a pipeline and then is connected with the shielding gas nozzle gas inlet 9 of the blowing device through a pipeline.
The valve groups all comprise pneumatic quick shut-off valves and manual quick shut-off valves and mass flow controllers. The valve groups 3, 4 and 5 and the pipeline gas pressure sensor 7 are connected with the upper computer through data lines.
A control method of a supersonic hydrogen injection system based on a Raoult nozzle specifically comprises the following modes:
non-hydrogen injection mode: when the blowing system does not spray hydrogen in the blast furnace smelting process, inert gas is introduced into the Raoult spray pipe and the protective gas spray pipe.
Hydrogen spraying mode: after hydrogen injection is started, the set hydrogen injection flow is input into a control system, a flow controller in a hydrogen control valve group automatically adjusts the opening of a valve, the hydrogen injection flow is adjusted to the set flow, and the protective gas spray pipe still sprays inert gas.
Monitoring the gas pressure of a pipeline in real time, and maintaining the existing operation unchanged when the gas pressure at the front end of the Raoult nozzle is larger than or equal to the Mach number critical pressure set by the Raoult nozzle; when the gas pressure at the front end of the Raoult nozzle is smaller than the set Mach number critical pressure, the control system automatically opens the quick cut-off valve of the main blowing inert gas pipeline control valve bank, and simultaneously adjusts the flow controller in the main blowing inert gas control valve bank, and adjusts the opening of the valve until the gas pressure at the front end of the Raoult nozzle is equal to the set Mach number critical pressure.
The inert gas comprises nitrogen and argon, the volume fraction of oxygen in the gas is less than 0.5%, and the Mach number range set by the Raoult nozzle is 1-2.
In the non-hydrogen spraying mode, the inert gas flow rate of the Raoult nozzle and the protective gas nozzle are respectively 500-2000Nm 3 /h、200-800Nm 3 And/h. In the hydrogen spraying mode, the flow rate of the hydrogen gas of the Raoult nozzle ranges from 0 to 2500Nm3/h, and the flow rate of the inert gas of the Raoult nozzle and the inert gas of the protective gas nozzle ranges from 0 to 1500Nm respectively 3 /h、200-800Nm 3 /h。
Example 1: the invention is applied to 1780m 3 The blast furnace was blown with hydrogen gas, the total of 26 tuyeres, the daily output of molten iron was 4300t, and the blowing amount of hydrogen gas per ton was 200Nm 3 At, the spray gun is inserted at an included angle of 15 degrees with the central line of the tuyere belly pipe, and the flow rate of the single hydrogen spray gun is 1380m 3 And/h, the Mach number of the Raoult nozzle is 1.5.
The inlet diameter of the shrinkage section of the Raoult spray pipe is 58.13mm, the length of the shrinkage section is 34.88mm, the semiconical coke of the shrinkage section is 22.6 degrees, the diameter of the throat section is 29.06mm, the length of the throat section is 8mm, the outlet diameter of the expansion section is 31.52mm, the length of the expansion section is 14.04mm, the half cone angle of the expansion section is 5 degrees, and the design inlet pressure of the Raoult spray pipe is 0.367MPa when the Mach number reaches 1.5. The inner diameter of the protective gas spray pipe is 65mm, and the outer diameter is 75mm.
When the hydrogen injection system does not inject hydrogen in the blast furnace smelting process, the Raoult spray pipe and the protective gas spray pipe are both filled with nitrogen, and the flow rates are respectively 1000Nm 3 /h and 500Nm 3 /h。
In the blast furnace smelting process, the set value of the hydrogen injection flow rate is 1500Nm 3 And/h, automatically adjusting the opening of the valve by a flow controller in the hydrogen control valve group to adjust the hydrogen injection flow to a set flow,the gas pressure at the front end of the Raoult nozzle is 0.367MPa higher than the designed inlet pressure, so that supersonic hydrogen jet is formed.
In the smelting process of the blast furnace, when the hydrogen injection flow is 500Nm 3 And when the pressure of the gas at the front end of the Raoult nozzle is smaller than the design inlet pressure of 0.367MPa, the control system automatically opens the quick cut-off valve of the main blowing inert gas pipeline control valve bank, and simultaneously adjusts the flow controller in the main blowing inert gas control valve bank, and adjusts the opening of the valve until the pressure of the gas at the front end of the Raoult nozzle is equal to 0.367MPa.
What is not described in detail in the present specification belongs to the prior art known to those skilled in the art. It is noted that the above description is helpful for a person skilled in the art to understand the present invention, but does not limit the scope of the present invention. Any and all such equivalent substitutions, modifications and/or deletions as may be made without departing from the spirit and scope of the invention.
Claims (6)
1. The ultrasonic hydrogen injection system based on the Raoult nozzle is characterized by comprising a Raoult nozzle body and a protective gas nozzle body sleeved on the Raoult nozzle body, wherein an annular gap is reserved between the outer surface of the Raoult nozzle body and the inner surface of the protective gas nozzle body to form a protective gas channel, an injection port of the Raoult nozzle body and an injection circumferential seam port of the protective gas nozzle body are in coaxial relation, an inlet end of the Raoult nozzle body is respectively connected with an output end of a hydrogen control valve group and an output end of a main injection inert gas control valve group through a three-way pipeline, an inlet end of the protective gas nozzle body is connected with an output end of the protective gas control valve group, an input end of the protective gas control valve group and an input end of the main injection inert gas control valve group are both connected with an inert gas source, an input end of the hydrogen control valve group is connected with a hydrogen source, and an inlet end of the Raoult nozzle body is provided with a pipeline gas pressure sensor to control the flow rate of ultrasonic jet formed by the injection port;
the protective gas jet flow of the injection circular seam port reduces the oxygen concentration in the injection port area on one hand, achieves the effect of removing fire of the hydrogen jet flow, and prolongs the length of the supersonic jet flow core area on the other hand so as to enlarge the combustion range of the hydrogen in the hearth of the iron-making blast furnace;
the pipeline gas pressure sensor, the main blowing inert gas control valve group, the hydrogen control valve group and the protective gas control valve group are respectively connected with the upper computer, so that supersonic jet flow is formed at the blowing port after the hydrogen and the main blowing inert gas are converged, and the protective gas reaches preset flow and flow velocity at the blowing circumferential seam port;
the injection port of the Raoult nozzle body is sequentially provided with an expansion section, a throat section and a contraction section inwards, the inlet diameter of the contraction section is 58 mm+/-10%, the half cone angle is 22 DEG+/-10%, the diameter of the throat section is 29 mm+/-10%, the length is 8 mm+/-10%, the outlet diameter of the expansion section is 31 mm+/-10%, and the half cone angle is 5 DEG+/-10%.
2. The ultrasonic hydrogen injection system based on a Raoult nozzle according to claim 1, wherein the inert gas is nitrogen and/or argon, and the oxygen volume fraction in the inert gas is less than 5%.
3. The ultrasonic hydrogen injection system based on a Raoult nozzle according to claim 1, wherein the velocity of the ultrasonic jet is mach 1-2.
4. Use of a supersonic hydrogen injection system based on a raoult lance according to any one of claims 1 to 3 in blast furnace ironmaking for injecting hydrogen from the tuyere of a blast furnace into the furnace hearth of a blast furnace.
5. A control method of a supersonic hydrogen injection system based on a raoult nozzle according to any of claims 1 to 3, comprising the following modes:
non-hydrogen injection mode: when the blowing system does not spray hydrogen in the blast furnace smelting process, the Raoult spray pipes and the protective gas spray pipes are all filled with inert gas;
hydrogen spraying mode: after hydrogen injection is started, inputting a set hydrogen injection flow into a control system, automatically adjusting the opening of a valve by a flow controller in a hydrogen control valve group, adjusting the hydrogen injection flow to the set flow, and injecting inert gas by a protective gas spray pipe;
monitoring the gas pressure of a pipeline in real time, and maintaining the existing operation unchanged when the gas pressure at the front end of the Raoult nozzle is larger than or equal to the Mach number critical pressure set by the Raoult nozzle; when the gas pressure at the front end of the Raoult nozzle is smaller than the set Mach number critical pressure, the control system automatically opens the quick cut-off valve of the main blowing inert gas pipeline control valve bank, and simultaneously adjusts the flow controller in the main blowing inert gas control valve bank, and adjusts the opening of the valve until the gas pressure at the front end of the Raoult nozzle is equal to the set Mach number critical pressure.
6. The control method according to claim 5, wherein the flow rate of the inert gas in the Raoult nozzle is in the range of 500 to 2000Nm in the non-hydrogen injection mode 3 And/h, the inert gas flow rate of the protective gas spray pipe ranges from 200Nm to 800Nm 3 /h；
In the hydrogen spraying mode, the flow rate of the hydrogen gas of the Raoult nozzle ranges from 0 to 2500Nm 3 And/h, the flow rate of the inert gas of the Raoult nozzle ranges from 0 to 1500Nm respectively 3 And/h, the inert gas flow ranges of the protective gas spraying pipes are respectively 200-800Nm 3 /h。
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| CN202210609779.1A CN115058548B (en) | 2022-05-31 | 2022-05-31 | Ultrasonic hydrogen injection system based on Raoult nozzle and control method |
| PCT/CN2022/102700 WO2023231126A1 (en) | 2022-05-31 | 2022-06-30 | Laval nozzle-based supersonic hydrogen injection system, and control method therefor |
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| CN202210609779.1A CN115058548B (en) | 2022-05-31 | 2022-05-31 | Ultrasonic hydrogen injection system based on Raoult nozzle and control method |
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| JP2001220617A (en) * | 1999-11-30 | 2001-08-14 | Kawasaki Steel Corp | Gas blowing lance |
| FR2816324B1 (en) * | 2000-11-09 | 2003-01-24 | Air Liquide | METHOD FOR INJECTING A GAS USING A NOZZLE |
| JP2006312757A (en) * | 2005-05-06 | 2006-11-16 | Jfe Steel Kk | Injection lance for gaseous reducing material, blast furnace and blast furnace operation method |
| UA113614C2 (en) * | 2013-02-14 | 2017-02-27 | METHOD OF OPERATION OF OXYGEN PRODUCTION COMPANY IN METALLURGICAL CAPACITY AND MEASUREMENT SYSTEM FOR DETERMINATION OF USED DURING SIGNIFICANCE | |
| CN106595317A (en) * | 2016-11-30 | 2017-04-26 | 宝钢工程技术集团有限公司 | Multifunctional metallurgical spray gun |
| CN211057145U (en) * | 2019-10-14 | 2020-07-21 | 武钢集团昆明钢铁股份有限公司 | Supersonic tuyere structure for blast furnace |
| CN113502362A (en) * | 2021-07-07 | 2021-10-15 | 山西晋南钢铁集团有限公司 | Method for improving heat of hydrogen metallurgy blast furnace |
| CN113739581B (en) * | 2021-08-12 | 2022-09-30 | 昌黎县兴国精密机件有限公司 | Vehicle-mounted hydrogen supply method and equipment for blast furnace or shaft furnace hydrogen-rich smelting |
| CN216786172U (en) * | 2022-01-20 | 2022-06-21 | 中钢集团鞍山热能研究院有限公司 | Composite fuel spray gun for iron making |
| CN114657294B (en) * | 2022-03-31 | 2023-02-07 | 北京科技大学 | Experimental method and device for simulating combustion of blast furnace injection fuel |
| CN114854916B (en) * | 2022-05-17 | 2023-12-29 | 中冶赛迪工程技术股份有限公司 | Supersonic tuyere blowing device and design method |
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