CN114317853B - Based on 2500m 3 Heating method for high-temperature gas by carbon-carbon circulation blowing of blast furnace gas - Google Patents
Based on 2500m 3 Heating method for high-temperature gas by carbon-carbon circulation blowing of blast furnace gas Download PDFInfo
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- CN114317853B CN114317853B CN202210049753.6A CN202210049753A CN114317853B CN 114317853 B CN114317853 B CN 114317853B CN 202210049753 A CN202210049753 A CN 202210049753A CN 114317853 B CN114317853 B CN 114317853B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Abstract
The invention discloses a computer program product based on 2500m 3 The heating method of high-temperature coal gas by blast furnace gas carbon cycle blowing comprises the steps of constructing a regenerative chamber of a hot blast furnace by using thirty-seven-hole checker bricks with the cross-sectional area of 27.75 square meters, wherein the fluid diameter of the checker bricks is 20mm; the suspension conveying speed of the mixed gas passing through a regenerative chamber of the hot blast stove is 5-30 m/s, an oxygen supply pipeline and a valve are arranged on a combustion air pipeline at the outlet of a combustion fan, the combustion of the accumulated carbon powder is accelerated by oxygen enrichment of the combustion air before the combustion of the heating furnace is finished each time, the pipeline flow velocity of the heated multiple coal gas media is 20m/s, and the multiple coal gas media are heated and combusted to discharge the mixed coal gas in the furnace into a blast furnace gas pipe network; three cut-off valves are respectively arranged on the mixed gas branch pipe, the blast furnace gas branch pipe, the combustion air branch pipe and the flue branch pipe, a gate valve and a connecting rod butterfly valve are adopted on the high-pressure side, a blind plate valve is arranged between the gate valve and the connecting rod butterfly valve, a nitrogen filling valve is arranged between the gate valve and the blind plate valve, and a bleeding valve is arranged between the blind plate valve and the connecting rod butterfly valve.
Description
Technical Field
The invention relates to a computer control system based on 2500m 3 A heating method of blast furnace gas carbon-cycle blowing high-temperature gas belongs to a gas heating method in the technical field of blast furnace low-carbon ironmaking.
Background
The process technology of the modern blast furnace ironmaking process has been developed for hundreds of years, 90% of pig iron is produced by the traditional blast furnace ironmaking process, the carbon emission of the blast furnace ironmaking process accounts for more than 70% of the carbon emission of the ferrous metallurgy industry, the traditional blast furnace is an extremely high-efficiency reactor when developed to the present, and the efficiency and the status of the traditional blast furnace cannot be completely replaced by other processes when theories and technologies such as high yield, low consumption, long service life, efficiency, high quality, environmental protection and the like are developed to the prosperous period. Iron and steel enterprises have reduced the fuel ratio of blast furnaces to achieve the purpose of reducing carbon emission by technical means of improving the quality of coke and ore, optimizing the design of blast furnace equipment, strengthening process operation and the like. If technical breakthrough can be made on the traditional blast furnace, the blast furnace is enabled to be green and low-carbon, the innovation point of the traditional blast furnace for developing low-carbon technology is certainly the main melody of the development of the iron and steel industry in the world, and therefore, the development of the low-carbon blast furnace and the reduction of the fossil fuel consumption of the traditional blast furnace are one of the main directions for realizing the carbon emission reduction of the iron and steel industry.
Eight-steel 3 seats 2500m 3 The medium-large blast furnace is the most main energy consumer and CO in the eight-steel ironmaking industry 2 Releasing the source, and continuously improving the traditional energy conservation and emission reductionOn the basis of the method (such as large coal injection, high air temperature and the like), the circulating injection and blowing of the top gas of the blast furnace for removing CO are developed and applied 2 Reducing gas and mixing and blowing the decarburized gas of the Ou-Meta furnace and the hydrogen-rich gas of the coke oven to realize the purposes of the Ou-Meta furnace and the 2500m 3 The multiple coupled low-carbon metallurgical technology of the large blast furnace and the coke oven realizes the circulation technology of the blast furnace and the top gas of the blast furnace which are injected with hydrogen-rich gas, ultrahigh oxygen-rich gas and total oxygen, and continuously improves the effects of energy conservation and emission reduction.
Nowadays, eight-steel 3 seats 2500m 3 The low-carbon metallurgy technology of the medium-large blast furnace realizes the purposes of blowing various coal gas media into the blast furnace and reducing carbon emission. Because the reducing gas in the coal gas needs to meet certain high-temperature thermodynamic conditions, especially the reaction of reducing the iron oxide by hydrogen-rich metallurgy can absorb a large amount of heat, the supplementary physical heat of the high-temperature thermodynamic conditions needed by supplementing the iron oxide reduction by a large amount of coke needs to be consumed, and the carbon reduction effect of the blast furnace injected coal gas is very limited. Ultra-high oxygen-enriched and total oxygen blast heat carrier-blast N 2 The reduction results in great reduction of the amount of iron gas per ton, 2500m 3 The top gas of the medium and large blast furnace is circularly sprayed with gas which is normal temperature gas after decarburization, so that the high oxygen concentration of a lower convolution area causes high local combustion focus temperature of the convolution area, and the blowing kinetic energy of a tuyere is insufficient after the normal temperature gas is sprayed, so that the diameter of the tuyere has to be greatly reduced in order to maintain the necessary blowing kinetic energy; meanwhile, the reduction of the gas quantity of the iron gas per ton leads to insufficient heat supply at the upper part of the furnace, thereby causing the shrinkage of a tuyere burning zone, failing to ensure the reasonability of the lower part gas flow distribution and the activity of a furnace hearth, and causing the stable forward running of the blast furnace to be out of control.
Disclosure of Invention
To solve 2500m 3 After the blast furnace is smelted and blown by ultrahigh oxygen enrichment or total oxygen to blow normal temperature coal gas, the physical heat under the high-temperature thermodynamic condition required by reducing iron oxide by reducing gas is insufficient, the defect that coke is consumed to supplement the physical heat required by reducing iron oxide is overcome, the problems of insufficient temperature and heat of the blown reduced coal gas are solved, and the 2500m blast furnace reduces the temperature of the coal gas 3 The problem of cold and hot in the blast furnace of the blast furnace ultrahigh oxygen enrichment or total oxygen smelting is solved, the consumption of the coke and coal powder of fossil fuel is reduced, and the carbon emission of the blast furnace process is reducedThe invention aims to provide a probe based on 2500m 3 A heating method for high-temperature coal gas by carbon cycle injection of blast furnace coal gas.
The invention adopts the technical scheme that the method is based on 2500m 3 The heating method of the blast furnace gas carbon circulating injection high-temperature gas comprises the following steps:
1. the structure of a regenerator of a heating furnace is improved, the cross-sectional area of the regenerator is 27.75 square meters, the regenerator is built by thirty-seven-hole checker bricks, and the fluid diameter of the checker bricks is 20mm; blowing the precipitated carbon powder into a 2500m & lt 3 & gt large blast furnace along with air flow for combustion at a suspension conveying speed of 5-30 m/s of the mixed gas in a regenerator of the heating furnace;
2. an oxygen supply pipeline and a valve are arranged on a combustion air pipeline at the outlet of the combustion fan, the combustion of carbon powder accumulated before the combustion of each heating furnace is finished is accelerated by oxygen enrichment of the combustion air, the pipeline flow rate of various heated coal gas media is 20m/s,
3. heating and burning various coal gas media: discharging the mixed gas in the furnace into a blast furnace gas pipe network;
4. the mixed gas branch pipe, the blast furnace gas branch pipe, the combustion air branch pipe and the flue branch pipe of various gas media are respectively provided with three cut-off valves, wherein the high-pressure side adopts a gate valve, the low-pressure side adopts a connecting rod butterfly valve, a blind plate valve is arranged between the gate valve and the connecting rod butterfly valve, a nitrogen filling valve is arranged between the gate valve and the blind plate valve for nitrogen sealing, a bleeding valve is arranged between the blind plate valve and the connecting rod butterfly valve, and the bleeding valve is normally opened when the blind plate valve and the connecting rod butterfly valve are closed, thereby preventing the occurrence of medium mixing when uncontrollable gas leaks;
5. discharging the mixed gas in the furnace into a blast furnace gas pipe network, after heating, firstly discharging the high-pressure mixed gas remained in the heating furnace into a blast furnace gas pipe for a burning furnace through a pressure discharge valve, and then further purging the gas in the furnace by adopting a nitrogen purging valve on a blast furnace gas branch pipe, so that the concentration of the mixed gas in the heating furnace is reduced, and the mixed gas is prevented from being discharged into a flue and a chimney;
6. the waste gas of the three heating furnaces is diffused and led to the inlet of a blast furnace gas main pipe from a waste gas diffusion main pipe, the waste gas diffusion valve is interlocked with a blast furnace gas flowmeter of the burning furnace, the heating furnace is not allowed to perform diffusion operation when no blast furnace gas flows through a waste gas mixing inlet, when high-temperature waste gas in the heating furnace is required to be diffused, the air diffusion valve is manually opened to perform diffusion, and the tail end of the diffusion pipe is provided with an electronic ignition device;
7. combustion to heating: at the final stage of combustion of the heating furnace, reducing the air surplus coefficient until stopping combustion;
8. CO and H are arranged on the flue gas branch pipe 2 、CH 4 、O 2 Monitoring, wherein CO monitoring is arranged on a combustion air branch pipeline, and O is arranged on a blast furnace gas branch pipeline 2 Monitoring, and starting nitrogen purging and diffusing immediately once exceeding;
9. explosion venting valves with rupture membranes are arranged on a coal gas inlet pipe, a combustion air inlet pipe and a flue branch pipe at the lower part of the heating furnace of a burner of the heating furnace;
10. quick cut-off valves are arranged on the cold gas branch pipe and the blast furnace gas branch pipe, and when various conditions of power failure, pressure loss and overtemperature occur, the system is automatically cut off immediately;
11. the computer control system is utilized to ensure that all valves are safely interlocked, three-point detection is set for each item of important gas component, temperature and pressure detection of interlocking control, a program can be executed downwards only when two-point detection is in accordance with requirements at the three points, and an alarm signal is sent out at the detection point which is not in accordance with the requirements;
12. the mixed gas branch pipe and the blast furnace gas branch pipe are provided with quick cut-off valves, so that the gas can be quickly and automatically cut off in power failure, pressure loss and explosion accident states.
The method solves the problems that the high-temperature thermodynamic condition physical heat required by reducing the iron oxide by reducing gas in the prior art of blowing cold gas is insufficient, and the physical heat required by reducing the iron oxide by consuming coke and supplementing the iron oxide is consumed, thereby achieving the purposes of reducing the solid fossil fuel of the blast furnace, improving the thermodynamic condition of reducing gas, improving the metallurgical efficiency of the blast furnace ironmaking and reducing the CO in the blast furnace ironmaking process 2 The purpose of discharging.
The invention upgrades the hot blast stove into the gas heating furnace by the technology as the inventionThe core technology of the invention changes the method of heating air medium by the traditional hot blast stove, prevents carbon deposition by improving the structural parameters of the regenerator, upgrades the system valve, and implements CO and H 2 、CH 4 、O 2 Monitoring, optimization of important gas components, temperature and pressure in interlocking control, optimization of operation method, and heating of the system to remove CO 2 Heating the obtained gas, the decarbonized gas of Europe-metallurgy furnace and the coke oven gas to 900-1300 deg.C, and spraying 2500m part of the heated high-temperature reduced gas 3 One part of the large-scale blast furnace tuyere is sprayed into the lower part of the furnace body, so that the production efficiency of the blast furnace is improved, the utilization coefficient of the blast furnace is improved, and fossil solid fuel is reduced.
The integral structure and the auxiliary valve of the traditional blast furnace hot blast stove are improved, on the basis of improving the safety of gas heating, various low-temperature gas media (mixed gas) are sprayed into a blast furnace tuyere by high-temperature gas at 950-1200 ℃, the amount of carbon burnt before the tuyere can be reduced by spraying the high-temperature mixed gas, and the heat brought by the hot gas replaces the heat of coke burning before the tuyere under the condition of constant unit pig iron heat income, so that the heat required by partial chemical reaction and furnace charge heating in the blast furnace is replaced, and the consumption of the solid fossil fuel coke is further reduced.
The high-temperature multiple coal gas medium (mixed coal gas) inlets are also arranged at the position of the blast furnace body, so that the problem of 2500m 3 The blast furnace body part of the blast furnace is insufficient in coal gas quantity and insufficient in heat quantity, and meanwhile, the iron ore is further physically preheated to a certain degree, so that the whole heat utilization and furnace charge running in the blast furnace reach the optimal optimization effect.
The properties of various heated coal gas media (mixed coal gas) comprise that the CO content is about 65.9 percent, the combustible range of the CO in the air (the standard state is 20 ℃,101.325 kPa) is 12.5 to 74 percent, and the lowest burning point in the air is 630 ℃. Carbon separation reaction 2CO =2C + O can occur when CO is heated under the condition of air isolation 2 The resulting carbon is a very fine carbon powder that appears as a relatively loose mass due to accumulation and agglomeration. The performance of the separated carbon powder is considered according to the characteristics of the coal powder. The coal powder is combustible substance, B-class fire hazard dangerous goods and powderThe dust has the advantages of explosiveness, ignition point between 300 ℃ and 500 ℃, and lower explosion limit concentration of 34g/m < 3 > -47 g/m < 3 > (the average particle size of dust is 5 mu m-10 mu m).
The 2500m 3 The process system in the heating method of blast furnace gas carbon circulating injection high-temperature gas comprises 2500m 3 A blast furnace body, a furnace top gas circulating system, a gas heating furnace, an auxiliary valve, a detection device and a furnace body tuyere injection device. The gas heating furnace is used for heating various gas media (mixed gas), and specifically comprises the step of removing CO 2 Heating the obtained coal gas, the decarbonized coal gas of the Europe and metallurgy furnace and the coke oven gas to 900-1300 ℃. The heated coal gas is sprayed in from the tuyere and the furnace body heating coal gas inlet. The coal gas heating furnace is different from the traditional hot blast stove in that: the traditional hot blast stove is used for heating air, and the optimized operation method and equipment of the invention are improved, and CO and H are implemented by means of measures for preventing carbon deposition, upgrading system valves and implementing CO and H 2 、CH 4 、O 2 Monitoring, and optimizing important gas components, temperature and pressure in interlocking control, and optimizing an operation method to finish a method capable of heating coal gas.
Detailed Description
Based on 2500m 3 The heating method of the blast furnace gas carbon circulating injection high-temperature gas comprises the following steps:
1. the structure of a regenerator of a heating furnace is improved, the cross-sectional area of the regenerator is 27.75 square meters, the regenerator is built by using thirty-seven-hole checker bricks, and the fluid diameter of the checker bricks is 20mm; the suspension conveying speed of the mixed gas passing through a regenerator of the heating furnace is 5-30 m/s, so that the separated carbon powder is blown into a 2500m < 3 > large blast furnace along with the gas flow for combustion;
2. an oxygen supply pipeline and a valve are arranged on a combustion air pipeline at the outlet of the combustion fan, the combustion of carbon powder accumulated before the combustion of each heating furnace is finished is accelerated by oxygen enrichment of the combustion air, the pipeline flow rate of various heated coal gas media is 20m/s,
3. heating and burning various coal gas media: discharging the mixed gas in the furnace into a blast furnace gas pipe network;
4. three cut-off valves are respectively arranged on a mixed gas branch pipe, a blast furnace gas branch pipe, a combustion air branch pipe and a flue branch pipe of various gas media, wherein a gate valve is arranged on the high-pressure side, a connecting rod butterfly valve is arranged on the low-pressure side, a blind valve is arranged between the gate valve and the connecting rod butterfly valve, a nitrogen filling valve is arranged between the gate valve and the blind valve for nitrogen sealing, a bleeding valve is arranged between the blind valve and the connecting rod butterfly valve, and the bleeding valve is normally opened when the blind valve and the connecting rod butterfly valve are closed, thereby avoiding the occurrence of medium mixing when uncontrollable gas leaks;
5. discharging the mixed gas in the furnace into a blast furnace gas pipe network, after heating, firstly discharging the high-pressure mixed gas remained in the heating furnace into a blast furnace gas pipe for a burning furnace through a pressure discharge valve, and then further purging the gas in the furnace by adopting a nitrogen purging valve on a blast furnace gas branch pipe, so that the concentration of the mixed gas in the heating furnace is reduced, and the mixed gas is prevented from being discharged into a flue and a chimney;
6. the waste gas of the three heating furnaces is diffused and led to the inlet of a blast furnace gas main pipe from a waste gas diffusion main pipe, and the waste gas diffusion valve is interlocked with a blast furnace gas flowmeter of the burning furnace, when no blast furnace gas flows through the waste gas mixing inlet, the heating furnace is not allowed to diffuse, when the high-temperature waste gas in the heating furnace is required to diffuse, the air diffusion valve is manually opened to diffuse, and the tail end of the diffusion pipe is provided with an electronic ignition device;
7. combustion to heating: reducing the air excess coefficient at the last stage of combustion of the heating furnace until the combustion is stopped;
8. CO and H are arranged on the flue gas branch pipe 2 、CH 4 、O 2 Monitoring, wherein CO monitoring is arranged on a combustion air branch pipeline, and O is arranged on a blast furnace gas branch pipeline 2 Monitoring, and starting nitrogen purging and diffusing immediately once exceeding;
9. setting explosion venting valves with rupture membranes on a coal gas inlet pipe, a combustion air inlet pipe and a flue branch pipe at the lower part of the heating furnace of a burner of the heating furnace;
10. quick cut-off valves are arranged on the cold gas branch pipe and the blast furnace gas branch pipe, and when power failure, pressure loss and overtemperature are caused, the system is immediately and automatically cut off;
11. the computer control system is utilized to ensure that all valves are safely interlocked, three-point detection is set for each item of important gas component, temperature and pressure detection of interlocking control, a program can be executed downwards only when two-point detection is in accordance with requirements at the three points, and an alarm signal is sent out at the detection point which is not in accordance with the requirements;
12. the mixed gas branch pipe and the blast furnace gas branch pipe are provided with quick cut-off valves, so that the gas can be quickly and automatically cut off in power failure, pressure loss and explosion accident states.
Examples
Burning rotary smoldering furnace (gas branch pipe):
1) The gas branch pipe is provided with three cut-off valves, wherein a gate valve is adopted at the high-pressure side close to the heating furnace, a connecting rod butterfly valve with good sealing performance is adopted at the low-pressure side, and a blind plate valve is arranged between the gate valve and the connecting rod butterfly valve.
2) Closing the gate valve, the blind plate valve and the connecting rod butterfly valve;
3) Opening a bleeding valve;
4) Opening a nitrogen purging and charging valve to purge the gas pipeline;
5) Closing the bleeding valve;
6) And (3) filling nitrogen between the gate valve and the blind plate valve, sealing, keeping the pressure of the nitrogen at 0.6MPa, closing the nitrogen purging and nitrogen filling valve, maintaining the pressure for 30 seconds, and allowing the next step of operation without reducing the pressure (the gas pressure of the heating furnace is 0.4 MPa).
7) The gas branch pipe is provided with a quick-cut valve, and the gas branch pipe is automatically cut off under abnormal conditions such as power failure or engine tripping of a combustion fan.
Burning rotary smoldering furnace (air branch pipe):
1) The air branch pipe is provided with three cut-off valves, wherein a gate valve is adopted at the high-pressure side close to the heating furnace, a connecting rod butterfly valve with good sealing performance is adopted at the low-pressure side, and a blind plate valve is arranged between the gate valve and the connecting rod butterfly valve.
2) Closing the gate valve, the blind plate valve and the connecting rod butterfly valve;
3) Opening a bleeding valve;
4) And (3) filling nitrogen between the gate valve and the blind plate valve, sealing, keeping the nitrogen pressure at 0.6MPa, closing the nitrogen purging and nitrogen filling valve, maintaining the pressure for 30 seconds, and allowing the next step of operation without reducing the pressure (the gas pressure of the heating furnace is 0.4 MPa).
5) The air branch pipe is provided with a quick-cut valve, and abnormal conditions such as power failure or tripping of a combustion fan are automatically cut off.
Burning rotary smoldering furnace (flue pipe):
1) The flue branch pipe is provided with three cut-off valves, wherein a gate valve is adopted at the high-pressure side close to the heating furnace, a connecting rod butterfly valve with good sealing performance is adopted at the low-pressure side, and a blind plate valve is arranged between the gate valve and the connecting rod butterfly valve. And CO, H2, CH4 and O2 monitoring is arranged on the flue gas branch pipe.
2) Closing the gate valve, the blind plate valve and the connecting rod butterfly valve;
3) Opening a bleeding valve;
4) Opening a nitrogen purging valve to purge the flue pipeline;
5) Closing the bleeding valve;
6) Nitrogen is filled between the gate valve and the blind plate valve for sealing, and the nitrogen pressure is 0.6MPa; closing the nitrogen purging and nitrogen filling valve, maintaining the pressure for 30 seconds, and allowing the next operation without reducing the pressure (the gas pressure of the heating furnace is 0.4 MPa);
conveying gas in a smoldering furnace:
1) Opening a pressure-equalizing blind plate and a mixed gas blind plate in sequence;
2) And opening a nitrogen pressure equalizing valve to equalize the pressure of the nitrogen in the heating furnace.
3) Opening a hot gas pressure equalizing valve;
4) Opening a hot gas valve;
5) Opening a hot coal gas pressure equalizing valve;
6) Opening a hot gas valve;
7) And opening a coal gas connecting rod gate valve and a gate valve in sequence.
Transferring the gas to a smoldering furnace:
1) Closing the hot coal gas pressure equalizing valve;
2) Closing the hot gas valve;
3) Closing the hot coal gas pressure equalizing valve;
4) Closing the hot gas valve;
5) Closing the pressure-equalizing blind plate, the coal gas connecting rod gate valve and the gate valve in sequence.
6) Closing the pressure-equalizing blind plate and the mixed gas blind plate in sequence;
7) Opening a relief valve, opening a nitrogen pressure equalizing valve, closing the relief valve and sealing with nitrogen in sequence.
Smoldering furnace to combustion:
safety measures are as follows: the waste gas is discharged, and the waste gas is discharged,
1) Opening a waste gas blind plate and a waste gas discharge valve to discharge the waste gas of the heating furnace coal to a furnace coal gas main pipe so as to achieve the purpose of continuous utilization;
2) After the pressure is released to the pressure of the burning furnace gas, closing the waste gas blind plate and the waste gas discharge valve in sequence;
2) Opening a nitrogen purging valve of the heating furnace to purge gas in the heating furnace, and performing the next operation after the gas on a flue is detected to be less than 24 PPm;
3) Sequentially opening a flue gate valve, a blow-off valve and a flue blind plate valve;
4) Continuously purging the gas to detect that the gas is 0PPm, then opening a connecting rod butterfly valve, closing a bleeding valve, and closing a nitrogen purging valve;
5) And carrying out furnace burning operation.
Example 7 operating parameters:
175000Nm heating gas flow 3 /h
Heating gas pressure of 0.55MPa (maximum 0.6 MPa)
The cold air temperature is 20 DEG C
Operation mode is that single furnace air supply
The gas feeding time is 1.3h
The burning time is 2.35h
Vault temperature of 1330 DEG C
Blast furnace gas temperature of 20.00 DEG C
Combustion air composition:
20.73 percent of oxygen, 78.00 percent of nitrogen and 1.27 percent of water vapor
The temperature of combustion air is 20 DEG C
Theoretical combustion temperature of 1376 DEG C
Smoke components:
blast furnace gas average flow (branch pipe) 80625 Nm 3 /h
Mean flow rate of combustion air (branch pipe) 96484 Nm 3 /h
Average flow of flue gas (branch pipe) 173952 Nm 3 /h
The average periodic air mixing temperature is 1260 DEG C
The average outlet temperature of the periodic waste gas is 215 DEG C
The maximum exhaust gas outlet temperature is 390 ℃.
Claims (1)
1. Based on 2500m 3 The heating method for high-temperature gas by carbon cycle injection of blast furnace gas is characterized in that:
1) The structure of a regenerator of a heating furnace is improved, the cross-sectional area of the regenerator is 27.75 square meters, the regenerator is built by using thirty-seven-hole checker bricks, and the fluid diameter of the checker bricks is 20mm; the suspension conveying speed of the mixed gas passing through a regenerator of the heating furnace is 5-30 m/s, so that the separated carbon powder is blown into a 2500m < 3 > large blast furnace along with the gas flow for combustion;
2) An oxygen supply pipeline and a valve are arranged on a combustion air pipeline at the outlet of the combustion fan, the combustion of carbon powder accumulated before the combustion of the heating furnace is finished is accelerated by oxygen enrichment of the combustion air, and the pipeline flow rate of various heated coal gas media is 20m/s;
3) And heating and burning various coal gas media: discharging the mixed gas in the furnace into a blast furnace gas pipe network;
4) The mixed gas branch pipe, the blast furnace gas branch pipe, the combustion air branch pipe and the flue branch pipe of various gas media are respectively provided with three cut-off valves, wherein the high-pressure side adopts a gate valve, the low-pressure side adopts a connecting rod butterfly valve, a blind valve is arranged between the gate valve and the connecting rod butterfly valve, a nitrogen filling valve is arranged between the gate valve and the blind valve for nitrogen sealing, a bleeding valve is arranged between the blind valve and the connecting rod butterfly valve, and the bleeding valve is normally opened when the blind valve and the connecting rod butterfly valve are closed, thereby avoiding the occurrence of medium mixing when uncontrollable gas leaks;
5) Discharging the mixed gas in the furnace into a blast furnace gas pipe network, after heating, firstly discharging the high-pressure mixed gas remained in the furnace into a blast furnace gas pipe for a furnace through a pressure discharge valve, and then further purging the gas in the furnace by adopting a nitrogen purging valve on a blast furnace gas branch pipe, so that the concentration of the mixed gas in the furnace is reduced, and the mixed gas is prevented from being discharged into a flue and a chimney;
6) The waste gas of the three heating furnaces is diffused and led to the inlet of a blast furnace gas main pipe from a waste gas diffusion main pipe, and the waste gas diffusion valve is interlocked with a blast furnace gas flowmeter of the burning furnace, when no blast furnace gas flows through a waste gas mixing inlet, the heating furnace is not allowed to diffuse, when high-temperature waste gas in the heating furnace is required to diffuse, the air diffusion valve is manually opened to diffuse, and the tail end of the diffusion pipe is provided with an electronic ignition device;
7) And combustion-to-heating: reducing the air excess coefficient at the last stage of combustion of the heating furnace until the combustion is stopped;
8) CO and H are arranged on the flue gas branch pipe 2 、CH 4 、O 2 Monitoring, wherein CO monitoring is arranged on a combustion air branch pipeline, and O is arranged on a blast furnace gas branch pipeline 2 Monitoring, and starting nitrogen purging and diffusing immediately once exceeding;
9) Setting explosion venting valves with rupture membranes on a coal gas inlet pipe, a combustion air inlet pipe and a flue branch pipe at the lower part of the heating furnace of a burner of the heating furnace;
10 The cold gas branch pipe and the blast furnace gas branch pipe are provided with quick cut-off valves, and when the conditions of power failure, pressure loss and overtemperature occur, the system is immediately and automatically cut off;
11 Using a computer control system to make all valves be safely interlocked, and each item of important gas component, temperature and pressure detection of interlocking control is provided with three-point detection, when the three-point detection meets the requirements, the program can be executed downwards, and when the detection does not meet the requirements, an alarm signal is sent out;
12 The mixed gas branch pipe and the blast furnace gas branch pipe are provided with quick cut-off valves, so that the gas can be quickly and automatically cut off in power failure, pressure loss and explosion accident states.
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| CN115094173B (en) * | 2022-06-27 | 2024-01-12 | 新疆八一钢铁股份有限公司 | Method for heating coal gas by hydrogen-rich carbon circulating blast furnace |
| CN115627308B (en) * | 2022-11-13 | 2024-03-26 | 新疆八一钢铁股份有限公司 | Control process for inhibiting carbon precipitation of heating gas by gas heating furnace |
| CN115751318A (en) * | 2022-11-28 | 2023-03-07 | 中钢设备有限公司 | Gas heating device and method |
| CN115786615A (en) * | 2022-12-22 | 2023-03-14 | 中钢设备有限公司 | Hydrogen-carbon-rich circulating blast furnace matched gas heating furnace |
| CN115852077A (en) * | 2022-12-22 | 2023-03-28 | 中钢设备有限公司 | Carbon deposition prevention device of gas heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5234490A (en) * | 1991-11-29 | 1993-08-10 | Armco Inc. | Operating a blast furnace using dried top gas |
| JPH10245611A (en) * | 1997-03-07 | 1998-09-14 | Nippon Steel Corp | Method for controlling hot stove |
| EP2798293B1 (en) * | 2011-12-27 | 2019-06-12 | HYL Technologies, S.A. de C.V. | Method of producing molten iron in a blast furnace with top-gas recycle |
| EP2719777A1 (en) * | 2012-10-12 | 2014-04-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Blast-furnace process with coke-oven gas injection and production plant for same |
| CN107365883A (en) * | 2017-09-18 | 2017-11-21 | 马鞍山钢铁股份有限公司 | A kind of blast furnace roof presses coal-gas recovering internal circulation system and its operating method |
| KR102322712B1 (en) * | 2019-11-20 | 2021-11-04 | 주식회사 포스코 | Method of manufacturing carbonmonoxide and its use |
| KR102348070B1 (en) * | 2019-12-23 | 2022-01-06 | 재단법인 포항산업과학연구원 | Hot blast stove recirculation facility and operating method thereof |
| CN112342332B (en) * | 2020-10-22 | 2022-05-06 | 马鞍山钢铁股份有限公司 | Ignition heat preservation and inverse air supply integrated system for hot blast stove and operation method |
| CN112430697A (en) * | 2020-10-26 | 2021-03-02 | 北京首钢股份有限公司 | Gas pipeline gas supply device of blast furnace hot blast stove |
| CN113774178B (en) * | 2021-10-14 | 2023-07-04 | 新疆八一钢铁股份有限公司 | Production system for coupling European smelting furnace and hydrogen-rich carbon circulating blast furnace |
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