CN114317853A - Based on 2500m3Heating method for high-temperature gas by carbon circulation injection of blast furnace gas - Google Patents
Based on 2500m3Heating method for high-temperature gas by carbon circulation injection of blast furnace gas Download PDFInfo
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- CN114317853A CN114317853A CN202210049753.6A CN202210049753A CN114317853A CN 114317853 A CN114317853 A CN 114317853A CN 202210049753 A CN202210049753 A CN 202210049753A CN 114317853 A CN114317853 A CN 114317853A
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- 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 2500m3The carbon cycle blowing high-temperature gas heating method of blast furnace gas, the cross sectional area of the regenerative chamber of the hot-blast furnace is 27.75 square meters, the said regenerative chamber is built by thirty-seven hole checker bricks, the fluid diameter of the checker brick is 20 mm; 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 speed 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; mixed gas branchThe pipe, the blast furnace gas branch pipe, the combustion air branch pipe and the flue branch pipe are respectively provided with three cut-off valves, the high-pressure side adopts a gate valve and a low-pressure side 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, 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 2500m3A heating method of blast furnace gas carbon circulating injection high temperature gas belongs to a gas heating method in the technical field of blast furnace low carbon iron making.
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 2500m3The medium-large blast furnace is the most main energy consumer and CO in the eight-steel ironmaking industry2The release source is developed and applied to the circulating injection and blow-off of CO from the top gas of the blast furnace on the basis of continuously improving the traditional energy-saving and emission-reducing methods (such as large coal injection, high air temperature and the like)2Reducing gas and mixing and blowing the decarburized gas of the Ou metallurgical furnace and the hydrogen-rich gas of the coke oven to realize the purposes of the Ou metallurgical furnace and the 2500m furnace3The 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 2500m3The 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 hydrogen-rich metallurgy reduction iron oxide reaction can absorb a large amount of heat, so that a large amount of supplementary physical heat of coke for supplementing the high-temperature thermodynamic conditions needed by the reduction of the iron oxide needs to be consumed, and the carbon reduction effect of the blast furnace injection coal gas is very limited. Ultrahigh oxygen-enriched and total oxygen blast heat carrier-blast N2The reduction results in great reduction of the amount of iron gas per ton, 2500m3Medium-large blast furnaceThe top gas is circularly blown into gas at room temperature after decarburization, so that the local combustion focus temperature in a convolution region is high due to high oxygen concentration in the convolution region at the lower part, the blowing kinetic energy of a tuyere is insufficient after the room temperature gas is sprayed, and 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 2500m3After normal temperature coal gas is blown in the blast furnace ultra-high oxygen enrichment or total oxygen smelting, the physical heat of the reducing gas under the high-temperature thermodynamic condition required for reducing the iron oxide is insufficient, the defect that coke is consumed for supplementing the physical heat required for reducing the iron oxide is overcome, the problems of insufficient blowing and reducing coal gas temperature and heat are solved, and the 2500m coal gas jet smelting device solves the problems of insufficient blowing and reducing coal gas temperature and heat3The invention aims to solve the problem of cold and hot blast furnaces of blast furnace ultra-high oxygen enrichment or total oxygen smelting, reduce the consumption of fossil fuel coke and coal powder, and reduce the carbon emission of blast furnace process, and provides a method for smelting blast furnace ultra-high oxygen enrichment or total oxygen smelting blast furnace with 2500m3A 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 2500m3The heating method of the blast furnace gas carbon circulating injection high-temperature gas comprises the following steps:
1. the structure of a regenerative chamber of a hot blast stove is improved, the cross-sectional area of the regenerative chamber is 27.75 square meters, the regenerative chamber is built by using thirty-seven-hole checker bricks, and the fluid diameter of the checker bricks is 20 mm; the suspension conveying speed of the mixed gas in a regenerative chamber of the hot blast stove is 5-30 m/s, so that the separated carbon powder is blown into a 2500m3 large blast furnace along with the air 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 and a low-pressure side connecting rod butterfly valve are adopted on the high-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 burner 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 diffusing main pipe, the waste gas diffusing valves are interlocked with a blast furnace gas flowmeter of the burning furnace, the diffusing operation of the hot blast furnace is not allowed when no blast furnace gas flows through a waste gas mixing inlet, when the high-temperature waste gas in the heating furnace is required to be diffused, the diffusing operation is performed by manually opening an air diffusing valve, and the tail end of the diffusing 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 pipe2、CH4、O2Monitoring, wherein CO monitoring is arranged on a combustion air branch pipeline, and O is arranged on a blast furnace gas branch pipeline2Monitoring, 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 a hot blast stove of a burner of the heating stove;
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.
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 process2The purpose of discharging.
The invention upgrades the hot blast stove into the gas heating furnace by the technology, as the core technology of the invention, changes the method of the traditional hot blast stove for heating the air medium, prevents carbon deposition by improving the structural parameters of the regenerator, upgrades the system valve at the same time, implements CO and H2、CH4、O2Monitoring, optimization of important gas components, temperature and pressure in interlocking control, optimization of operation method, and heating of the system to remove CO2Heating the obtained coal gas, the decarburized coal gas of the pyrometallurgical furnace and the coke oven gas to the temperature of 900-1300 ℃, and spraying part of the heated high-temperature reducing coal gas into 2500m3One 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.
By improving the integral structure and the auxiliary valve of the traditional blast furnace hot blast stove, 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 950-plus-1200 ℃ high-temperature gas, the quantity of carbon burnt in front of the tuyere can be reduced by spraying the high-temperature mixed gas, and the heat brought by the hot gas replaces the heat burnt by coke in front of the tuyere under the condition of constant unit pig iron heat income, so that part of heat required by chemical reaction in the blast furnace and furnace charge heating is replaced, and the consumption of the solid fossil fuel coke is further reduced.
The 2500m is solved by arranging a plurality of high-temperature coal gas medium (mixed coal gas) inlets at the position of the blast furnace body3The blast furnace body part of the blast furnace is insufficient in gas quantity and insufficient in heat, and meanwhile, the iron ore is further physically preheated to a certain degree, so that the whole heat utilization inside the blast furnace and the furnace burden can be smoothly carried out to achieve the best 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 evolution reaction of CO 2CO =2C + O when CO is heated under the condition of air exclusion2The resulting carbon is a very fine carbon powder that is in 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 a combustible substance, a B-class fire hazard and dust is explosive, the ignition point is 300-500 ℃, and the lower explosion limit concentration is 34g/m 3-47 g/m3 (the average particle size of the dust is 5-10 mu m).
The 2500m3The process system in the heating method of blast furnace gas carbon circulating injection high-temperature gas comprises 2500m3A 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 CO2Heating the obtained coal gas, the decarburization coal gas of the Europe and metallurgy furnace and the coke oven gas to the temperature of 900-. 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 the equipment of the invention are improved, and CO and H are implemented by means of measures for preventing carbon deposition and upgrading system valves2、CH4、O2Monitoring, and optimizing important gas components, temperature and pressure in interlocking control, and optimizing an operation method to complete a method capable of heating coal gas.
Detailed Description
Based on 2500m3The heating method of the blast furnace gas carbon circulating injection high-temperature gas comprises the following steps:
1. the structure of a regenerative chamber of a hot blast stove is improved, the cross-sectional area of the regenerative chamber is 27.75 square meters, the regenerative chamber is built by using thirty-seven-hole checker bricks, and the fluid diameter of the checker bricks is 20 mm; the suspension conveying speed of the mixed gas in a regenerative chamber of the hot blast stove is 5-30 m/s, so that the separated carbon powder is blown into a 2500m3 large blast furnace along with the air 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 and a low-pressure side connecting rod butterfly valve are adopted on the high-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 burner 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 diffusing main pipe, the waste gas diffusing valves are interlocked with a blast furnace gas flowmeter of the burning furnace, the diffusing operation of the hot blast furnace is not allowed when no blast furnace gas flows through a waste gas mixing inlet, when the high-temperature waste gas in the heating furnace is required to be diffused, the diffusing operation is performed by manually opening an air diffusing valve, and the tail end of the diffusing 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 pipe2、CH4、O2Monitoring, wherein CO monitoring is arranged on a combustion air branch pipeline, and O is arranged on a blast furnace gas branch pipeline2Monitoring, 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 a hot blast stove of a burner of the heating stove;
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 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 coal 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 coal gas pressure of the heating furnace is 0.4 MPa).
5) The air branch pipe is provided with a quick-cut valve, and the air branch pipe is automatically cut off under abnormal conditions such as power failure or engine tripping of a combustion fan.
Combustion 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. CO, H2, CH4 and O2 are arranged on the flue gas branch pipe for monitoring.
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 0.6 MPa; closing a nitrogen purging and filling valve, maintaining the pressure for 30 seconds, and allowing the next operation without reducing the pressure (the pressure of the coal gas of the heating furnace is 0.4 MPa);
conveying gas in a braising 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 coal 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 detecting that the gas on a flue is 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 flow3/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 mean flow (branch) 80625 Nm3/h
Mean flow rate of combustion air (branch line) 96484 Nm3/h
Mean flow of flue gas (branch line) 173952 Nm3/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 was 390 ℃.
Claims (1)
1. Based on 2500m3The heating method for high-temperature gas by carbon cycle injection of blast furnace gas is characterized in that:
1) the structure of a regenerative chamber of the hot blast stove is improved, the cross-sectional area of the regenerative chamber is 27.75 square meters, the regenerative chamber is built by using thirty-seven-hole checker bricks, and the fluid diameter of the checker bricks is 20 mm; the suspension conveying speed of the mixed gas in a regenerative chamber of the hot blast stove is 5-30 m/s, so that the separated carbon powder is blown into a 2500m3 large blast furnace along with the air 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 20 m/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 and a low-pressure side 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, a waste gas diffusion valve is interlocked with a blast furnace gas flowmeter of the burning furnace, the diffusion operation of the hot blast furnace is not allowed when no blast furnace gas flows through a waste gas mixing inlet, when the high-temperature waste gas in the heating furnace is required to be diffused, the high-temperature waste gas is diffused by adopting a manual opening mode of an air diffusion valve, and the tail end of a 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 pipe2、CH4、O2Monitoring, wherein CO monitoring is arranged on a combustion air branch pipeline, and O is arranged on a blast furnace gas branch pipeline2Monitoring, 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 hot blast stove of a burner of the heating stove;
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 used for safely interlocking all valves, 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 required by the three points, and an alarm signal is sent out when the detection points which do not meet the requirements are detected;
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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094173A (en) * | 2022-06-27 | 2022-09-23 | 新疆八一钢铁股份有限公司 | Method for heating coal gas by hydrogen-rich carbon circulating blast furnace |
| CN115627308A (en) * | 2022-11-13 | 2023-01-20 | 新疆八一钢铁股份有限公司 | Control process for inhibiting carbon evolution of heating gas of 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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| 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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