CN114645104A - CO (carbon monoxide)2Blast furnace ironmaking system with ultralow carbon emission for resource utilization - Google Patents
CO (carbon monoxide)2Blast furnace ironmaking system with ultralow carbon emission for resource utilization Download PDFInfo
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- CN114645104A CN114645104A CN202210299751.2A CN202210299751A CN114645104A CN 114645104 A CN114645104 A CN 114645104A CN 202210299751 A CN202210299751 A CN 202210299751A CN 114645104 A CN114645104 A CN 114645104A
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- blast furnace
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- coal powder
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- resource utilization
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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
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/22—Increasing the gas reduction potential of recycled exhaust gases by reforming
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
- C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
Abstract
The invention discloses CO2A blast furnace iron-making system with resource utilization and ultra-low carbon emission is characterized in that pure oxygen is blown into a blast furnace tuyere, non-nitrogen or ultra-low nitrogen blast furnace metallurgical gas is output from a blast furnace, and CO is removed after the blast furnace gas is pressurized2Removal of CO2Pressurizing, delivering the gas into a plasma moment body through a pipeline, heating to 3000-3500 ℃, and heating the high-temperature CO through the plasma moment2Entering the reforming chamber through a plasma torch nozzle; by removing CO2High-pressure blast furnace gas as gas for carrying coal powder is injected into the reforming chamber together with the coal powder through the coal powder nozzle, and 3000-3500 ℃ high-temperature CO is arranged in the reforming chamber2Quickly reforming the coal powder by contacting with the sprayed coal powder, converting the coal powder into CO completely, and removing the CO as carrier gas2The blast furnace gas is quickly heated up together to finally obtain the reformed mixed gas with the temperature of 1500 plus 1800 ℃, and the reformed mixed gas is blown into the blast furnace from the blast furnace tuyere.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to CO2A blast furnace iron-making system with ultra-low carbon emission for resource utilization.
Background
The oxygen content of blast air in traditional blast furnace iron making is 21-28%, the blast air is heated to about 1200 ℃ by a hot blast stove, the required hot blast heating furnace adopts a hot blast stove heating mode, the heating medium is mostly pressurized air containing 21% of oxygen, the checker bricks in the heating furnace are combusted in a combustion chamber of the hot blast stove by using furnace gas and combustion-supporting air, the furnace burning operation is stopped when the temperature of the checker bricks is raised to 1250 ℃ + 1400 ℃, cold air is blown in from a cold air inlet of the hot blast stove, the blown cold air is subjected to heat transfer with high-temperature checker bricks in the hot blast stove to form hot air, then the hot air and the cold air are mixed at a mixing valve according to a certain proportion, the mixed air reaches the temperature required by a user, and finally the mixed air is sent into the blast furnace, and the highest temperature of the hot air which is generally sent is about 1200 ℃. After a series of oxidation-reduction reactions of blast furnace hot air in a tuyere and a furnace, coal gas with about 50% of nitrogen content is output, the coal gas cannot be recycled in the blast furnace again and is output as blast furnace coal gas, and carbon in the coal gas is actually a resource which is not utilized, so that the carbon consumption of the traditional blast furnace is high.
In order to reduce the carbon consumption of a blast furnace, eight-steel develops a top coal gas circulating oxygen blast furnace, total oxygen smelting replaces traditional blast smelting, output low-nitrogen coal gas is recycled after carbon dioxide is removed, and the purpose of reducing the carbon consumption is achieved. The volume concentration of the removed carbon dioxide reaches more than 98 percent, and the carbon dioxide is basically not discharged outside at the present stage, so that the emission of the carbon dioxide is high.
Disclosure of Invention
The invention aims to provide CO2The blast furnace ironmaking system with ultralow carbon emission for resource utilization can solve the problems in the background technology and reduce the carbon emission.
CO (carbon monoxide)2A blast furnace iron-smelting system with resource utilization and ultra-low carbon emission is characterized in that a blast furnace body is provided with a plurality of tuyere air supply devices which are uniformly distributed on the cross section of a blast furnace hearth, pure oxygen is blown into a blast furnace tuyere, the blast furnace outputs nitrogen-free or ultra-low nitrogen blast furnace metallurgical coal gas, and the blast furnace coal gas is pressurized and then CO is removed2Removal of CO2Pressurizing, conveying into a plasma moment body through a pipeline for heating, and heating the high-temperature CO by the plasma moment2Entering the reforming chamber through a plasma torch nozzle; by removing CO2 High-pressure blast furnace gas as coal powder carrying gas is jetted into the reforming chamber together with coal powder through the coal powder jet nozzle, and high-temperature CO is generated in the reforming chamber2Quickly reforming with the sprayed coal powder to convert it into CO, and removing CO as carrier gas2 The blast furnace gas is also quickly heated to finally obtain the reformed mixed gas, and the reformed mixed gas is blown into the blast furnace from the blast furnace tuyere. Furthermore, the plasma rectangular body, the plasma rectangular nozzle, the reforming chamber and the air port air supply device are all cooled and protected by high-pressure cooling water, and the high-pressure cooling water inlet and outlet pipelines are all monitored by a flowmeter and a thermometer.
Further, CO removal from blast furnace gas2Is heated to 3000-3500 ℃ by plasma and is converted into CO and H by coal powder reforming2Wherein the content of CO is more than 90%.
Further, under the working condition of the blast furnace total oxygen smelting, the temperature of the reforming mixed gas output by the reforming chamber is 1500-1800 ℃.
The production of the system comprises the following steps:
s1, sending metallurgical coal gas generated by a total oxygen blast furnace into a dust removal and decarburization device to separate CO in the metallurgical coal gas2The nitrogen content is below 10%.
S2, separating CO separated in the step S12And exogenous CO2Converging, and pressurizing to 0.35-0.5 MPa.
S3, pressurizing CO2Heating the mixture in a plasma torch, and regulating the power of the plasma torch to make CO2The output temperature of (1) is between 3000 ℃ and 3500 ℃.
S4, using the high-temperature CO obtained in the step S32Feeding into a reforming chamber to remove CO2The high-pressure gas of the blast furnace is used as the gas for carrying the coal dust, and the coal dust is sprayed into the reformer to ensure that the high-temperature CO is used2And coal powder are reformed at high temperature to generate CO, hydrocarbon and a small amount of H2。
And S5, injecting the gas in the reforming chamber into the blast furnace through a tuyere air supply device to participate in the reduction reaction of the iron ore.
Furthermore, the plasma rectangular body, the plasma rectangular nozzle, the reforming chamber and the air port air supply device are all cooled and protected by high-pressure cooling water, and a flow meter and a thermometer are arranged on a high-pressure cooling water inlet and outlet pipeline for monitoring.
Furthermore, a flow regulating valve, a flow meter, a pressure meter and a thermometer are arranged on a pipeline in front of the plasma torch inlet, a temperature meter and a pressure meter are arranged on a pipeline at the front end of the coal injection pipe entering the reforming chamber, and the pressure meter and the temperature meter are arranged on the reforming chamber.
Further, the energy consumed by the plasma torch for heating the metallurgical gas is green electricity, namely clean energy generated by wind power and photovoltaic.
Further, the exogenous CO described in step S22Is in the form of CO25-30% of the total amount.
Further, CO of step S42The injection amount of the ton iron is 720-840m3/t。
Compared with the prior art, the invention has the beneficial effects that:
the invention consumes CO according to the plasma moment performance2Realization of CO2And the reforming gas can reach 1500-1800 ℃, the carbon consumption of a blast furnace process is greatly reduced, and the coke ratio of the blast furnace can be reduced to below 150 kg/t. The nitrogen consumption of the blast furnace process is reduced, and the energy consumed by the plasma moment is completely green energy, so that the environment is not damaged.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides the following technical implementation scheme:
please refer to fig. 1, a CO2A blast furnace iron-smelting system with ultralow carbon emission for resource utilization comprises a blast furnace bodyA plurality of tuyere air supply devices are uniformly distributed on the cross section of a blast furnace hearth, pure oxygen is blown into the tuyere of the blast furnace, the blast furnace outputs nitrogen-free or ultra-low nitrogen blast furnace metallurgical coal gas, and the CO is removed after the blast furnace coal gas is pressurized2Removal of CO2Pressurizing, conveying into a plasma moment body through a pipeline for heating, and heating the high-temperature CO by the plasma moment2Entering the reforming chamber through a plasma torch nozzle; by removing CO2 High-pressure blast furnace gas as coal powder carrying gas is sprayed into the reforming chamber together with coal powder through the coal powder nozzle, and high-temperature CO is generated in the reforming chamber2Quickly reforming the coal powder by contacting with the sprayed coal powder, and completely converting the coal powder into CO which is used as carrier gas to remove CO2 The temperature of the blast furnace gas can be quickly raised, and finally the reforming mixed gas is obtained and is blown into the blast furnace from the blast furnace tuyere. Furthermore, the plasma rectangular body, the plasma rectangular nozzle, the reforming chamber and the air port air supply device are all cooled and protected by high-pressure cooling water, and the high-pressure cooling water inlet and outlet pipelines are all monitored by a flowmeter and a thermometer.
Preferably, the plasma moment body, the plasma moment nozzle, the reforming chamber and the air port air supply device are protected by cooling water with high pressure, and the water inlet and outlet pipelines of the cooling water with high pressure are monitored by flow meters and thermometers.
Preferably, a flow regulating valve, a flow meter, a pressure meter and a temperature meter are arranged on a pipeline in front of the plasma torch inlet, a pressure meter and a temperature meter are arranged at the position of the plasma torch nozzle, a temperature meter and a pressure meter are arranged on a pipeline at the front end of the coal injection pipe entering the reforming chamber, the reforming chamber is provided with the pressure meter and the temperature meter, and a flow meter is arranged at the outlet of the reforming chamber.
Preferably, the energy consumed by the plasma torch for heating the metallurgical gas is green electricity, namely clean energy generated by wind power, photovoltaic power and the like, and is green and environment-friendly.
The invention comprises the following steps:
s1, sending metallurgical coal gas generated by an Ou metallurgical furnace or a total oxygen blast furnace into a dust removal and decarburization device, and separating CO in the metallurgical coal gas2The content of nitrogen is 0-10%.
S2, separating CO separated in the step s12And an external sourceCO2Converging, and pressurizing to 0.35-0.5 MPa.
S3, pressurizing CO2Heating in plasma torch, and adjusting power of plasma torch to make CO2The output temperature of (1) is between 3000 ℃ and 3500 ℃.
S4, high-temperature CO obtained in the step S32Feeding into a reformer, and spraying pulverized coal into the reformer to make CO2And coal powder are reformed at high temperature to generate CO, hydrocarbon and a small amount of H2。
And S5, injecting the gas and the oxygen in the reformer into the blast furnace through a tuyere air supply device to participate in the reduction reaction of the iron ore.
Preferably, the exogenous CO is used in step S22Is in the form of CO25-30% of the total amount.
Preferably, CO of step S42The injection amount of the ton iron is 720-840m3/t。
Carrying out intermediate repair on the blast furnace with 380m length of 6-month eight-steel in 2020, and synchronously putting 14 sets of CO into the blast furnace2Plasma moment heater to reform transform the coal gas system. A carbon dioxide collecting device, a blast furnace gas carbon dioxide collecting device, a carbon dioxide pressurizer, a plasma torch heater, a reforming chamber and the like are arranged, and the collected and collected CO is collected2After pressurization, heating by plasma torch, heated CO2Spraying the mixture into a reforming chamber, converging and reforming the mixture with synchronously sprayed coal powder, then blowing the mixture into a blast furnace from a tuyere, and testing the system after the intermediate repair is finished to successfully remove CO2Heated to 3000 ℃ by plasma moment, merged and reformed with coal powder and then injected into a blast furnace.
In the process, CO is used firstly2Pressurizing CO by pressurizer2The pressurized normal temperature CO2Directly spraying into plasma torch, starting plasma torch heater, and introducing CO2Heating to 3000 deg.C, and heating the heated CO2Introducing into a reforming chamber, simultaneously starting to send coal injection and air injection (0.6 MPa) into the blast furnace, and measuring the O in the furnace2When the content is less than 1 percent, the blast furnace is fed with oxygen and ignited after the blast furnace system is confirmed to be normal, the first furnace iron is discharged from the blast furnace after 10 hours of ignition, the coke load of the blast furnace is slowly reduced until the coke ratio reaches 450Kg/t, and then the coke is discharged to the blast furnaceThe coal powder is injected into the reforming chamber, the injection amount of the coal powder is increased according to the condition of reducing the coke ratio until the coke ratio is reduced to 180Kg/t and the coal ratio is 180Kg/t, the blast furnace is stably and smoothly operated, the coal powder is injected into the reforming chamber, and the plasma moment heating CO is realized after medium maintenance2，CO2Reacting with coal powder, reforming and blowing into a blast furnace.
The invention utilizes the plasma moment characteristic and CO2Physical and chemical properties of CO2Reforming with coal powder at over 1500 deg.C and CO2Substituted blast furnace N2The inert gas has the function of reducing nitrogen consumption of a blast furnace system, greatly reduces carbon consumption of a blast furnace process, and the energy consumed by the plasma moment is completely green energy, so that the environment is not damaged. The carbon emission of the traditional blast furnace is reduced by more than 60 percent.
The above description is only for illustrating the technical solution of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solution of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. CO (carbon monoxide)2The ultra-low carbon of resource utilization discharges blast furnace ironmaking system, and the blast furnace body has a plurality of wind gap air supply arrangement evenly distributed on the blast furnace shaft cross section, and pure oxygen is blown into to the blast furnace wind gap, and blast furnace output does not have nitrogen or ultra-low nitrogen blast furnace metallurgical coal gas, its characterized in that: removing CO after pressurizing blast furnace gas2Removal of CO2Pressurizing, conveying into a plasma moment body through a pipeline for heating, and heating the high-temperature CO by the plasma moment2Entering the reforming chamber through a plasma torch nozzle; by removing CO2 High-pressure blast furnace gas as coal powder carrying gas is sprayed into the reforming chamber together with coal powder through the coal powder nozzle, and high-temperature CO is generated in the reforming chamber2Quickly reforming the coal powder by contacting with the sprayed coal powder, and completely converting the coal powder into CO which is used as carrier gas to remove CO2 The blast furnace gas is also quickly heated to finally obtain the reformed mixed gas, and the reformed mixed gas is blown into the blast furnace from the blast furnace tuyere.
2. CO according to claim 12A resource utilization ultra-low carbon emission blast furnace iron-making system is characterized in that: CO removal from blast furnace gas2Heated to 3000-3500 ℃ by plasma moment and converted into CO and H by coal powder reforming2Wherein the content of CO is more than 90%.
3. CO according to claim 12A resource utilization ultra-low carbon emission blast furnace iron-making system is characterized in that: under the working condition of the blast furnace total oxygen smelting, the temperature of the reforming mixed gas output by the reforming chamber is 1500-1800 ℃.
4. CO according to claim 12The blast furnace ironmaking system with ultralow carbon emission for resource utilization is characterized in that: the method comprises the following steps:
s1, sending metallurgical coal gas generated by a total oxygen blast furnace into a dust removal and decarburization device to separate CO in the metallurgical coal gas2The nitrogen content is below 10 percent;
s2, separating CO separated in the step S12And exogenous CO2Converging, and pressurizing to 0.35-0.5 Mpa;
s3, pressurizing CO2Heating in plasma torch, and adjusting power of plasma torch to make CO2The output temperature is between 3000 and 3500 ℃;
s4, using the high-temperature CO obtained in the step S32Feeding into a reforming chamber to remove CO2The high-pressure gas of the blast furnace is used as the gas for carrying the coal dust, and the coal dust is sprayed into the reformer to ensure that the high-temperature CO is used2Reforming with coal powder at high temperature to produce CO, hydrocarbon and small amount of H2；
S5, injecting the gas in the reforming chamber into a blast furnace through a tuyere air supply device to participate in reduction reaction of iron ore;
CO according to claim 12A resource utilization ultra-low carbon emission blast furnace iron-making system is characterized in that: the plasma rectangular body, the plasma rectangular nozzle, the reforming chamber and the air port air supply device are cooled and protected by high-pressure cooling water, and the high-pressure cooling is carried outThe water inlet and outlet pipelines are monitored by a flowmeter and a thermometer.
5. CO according to claim 12A resource utilization ultra-low carbon emission blast furnace ironmaking system is characterized in that: the front pipeline of the plasma torch inlet is provided with a flow regulating valve, a flow meter, a pressure gauge and a thermometer, the front pipeline of the coal injection pipe entering the reforming chamber is provided with a thermometer and a pressure gauge, and the reforming chamber is provided with a pressure gauge and a thermometer.
6. CO according to claim 12A resource utilization ultra-low carbon emission blast furnace iron-making system is characterized in that: the energy consumed by the plasma moment for heating the metallurgical gas is green electricity, namely clean energy generated by wind power and photovoltaic.
7. CO according to claim 32A resource utilization ultra-low carbon emission blast furnace iron-making system is characterized in that: exogenous CO as described in step S22Is in the form of CO25-30% of the total amount.
8. CO according to claim 32A resource utilization ultra-low carbon emission blast furnace iron-making system is characterized in that: CO of step S42The injection amount of the ton iron is 720-840m3/t。
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| CN202210299751.2A CN114645104B (en) | 2022-03-25 | 2022-03-25 | CO (carbon monoxide) 2 Ultra-low carbon emission blast furnace ironmaking system for resource utilization |
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| CN202210299751.2A CN114645104B (en) | 2022-03-25 | 2022-03-25 | CO (carbon monoxide) 2 Ultra-low carbon emission blast furnace ironmaking system for resource utilization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354098A (en) * | 2022-08-15 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Smelting method for plasma heating of blast furnace gas by hydrogen-rich carbon circulation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105586456A (en) * | 2016-02-29 | 2016-05-18 | 北京神雾环境能源科技集团股份有限公司 | Joint production system and joint production method of oxygen blast furnace and gas-based shaft kiln |
| WO2020234290A1 (en) * | 2019-05-21 | 2020-11-26 | Paul Wurth S.A. | Method for operating a blast furnace |
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- 2022-03-25 CN CN202210299751.2A patent/CN114645104B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105586456A (en) * | 2016-02-29 | 2016-05-18 | 北京神雾环境能源科技集团股份有限公司 | Joint production system and joint production method of oxygen blast furnace and gas-based shaft kiln |
| WO2020234290A1 (en) * | 2019-05-21 | 2020-11-26 | Paul Wurth S.A. | Method for operating a blast furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354098A (en) * | 2022-08-15 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Smelting method for plasma heating of blast furnace gas by hydrogen-rich carbon circulation |
| CN115354098B (en) * | 2022-08-15 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Smelting method for plasma heating of hydrogen-rich carbon circulating blast furnace gas |
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