CN117512241A - Gas heat value regulating and controlling method of hydrogen-rich carbon circulating oxygen blast furnace - Google Patents
Gas heat value regulating and controlling method of hydrogen-rich carbon circulating oxygen blast furnace Download PDFInfo
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- CN117512241A CN117512241A CN202311440252.1A CN202311440252A CN117512241A CN 117512241 A CN117512241 A CN 117512241A CN 202311440252 A CN202311440252 A CN 202311440252A CN 117512241 A CN117512241 A CN 117512241A
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- gas
- furnace
- valve
- flue
- burning
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- 239000007789 gas Substances 0.000 title claims abstract description 160
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 35
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000001301 oxygen Substances 0.000 title claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 239000001257 hydrogen Substances 0.000 title claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 13
- 230000001276 controlling effect Effects 0.000 title claims description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 85
- 238000002485 combustion reaction Methods 0.000 claims abstract description 51
- 238000004064 recycling Methods 0.000 claims abstract description 36
- 239000011449 brick Substances 0.000 claims abstract description 18
- 238000005261 decarburization Methods 0.000 claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 76
- 239000003546 flue gas Substances 0.000 claims description 76
- 238000005516 engineering process Methods 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000000112 cooling gas Substances 0.000 claims 1
- 238000003723 Smelting Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a gas heat value regulating method of a hydrogen-rich carbon circulating oxygen blast furnace, which realizes the purpose of recycling after outputting top gas for decarburization through total oxygen smelting, decarburization gas enters the blast furnace again and is heated to more than 1100 ℃ through a gas heating furnace, the gas heating furnace firstly heats checker bricks in the heating furnace through burning furnace gas and combustion air which are introduced into the heating furnace, then sends normal-temperature decarburization gas to the gas heating furnace, decarburization gas is quickly heated to more than 1100 ℃ through the checker bricks of the gas heating furnace and is sent out from an outlet of the gas heating furnace to the blast furnace for recycling.
Description
Technical Field
The invention relates to a gas heat value regulating and controlling method of a hydrogen-rich carbon circulating oxygen blast furnace.
Background
The hot air heating furnace required by the traditional blast furnace ironmaking adopts a hot air furnace heating mode, the heating medium is mostly air with oxygen content of 21%, the checker bricks in the heating furnace are burnt in a combustion chamber of the hot air furnace by using furnace burning gas and combustion air, when the temperature of the checker bricks is raised to 1250-1400 ℃, the furnace burning operation is stopped, cold air is blown in from a cold air inlet of the hot air furnace, and the blown cold air is changed into hot air after heat transfer with the high-temperature checker bricks in the hot air furnace, and is fed into the blast furnace; when the air temperature does not meet the requirements of users, replacing other hot air furnaces after the burning of the furnace to send hot air, and carrying out the next round of furnace burning flow on the hot air furnace after the air is sent.
The hydrogen-rich carbon circulating oxygen blast furnace realizes the purpose of recycling the decarbonized output top gas after full oxygen smelting, the decarbonized gas is heated to more than 1100 ℃ by a gas heating furnace before entering the blast furnace again, the gas heating furnace heats the checker bricks in the heating furnace by burning the burning furnace gas and combustion air which are introduced into the heating furnace, then the normal-temperature decarbonized gas is sent to the gas heating furnace, the decarbonized gas can be quickly heated to more than 1100 ℃ by the checker bricks of the gas heating furnace, and then is sent out to the blast furnace for recycling, and generally, 3 gas heating furnaces are also arranged, which are similar to the traditional blast furnace hot blast furnace for recycling, but due to the adoption of the full oxygen smelting process, the output gas heat value is far higher than that of the traditional blast furnace, and the heat value is 7000kj/m 3 Above, the high heat value gas directly enters the gas heating furnace to burn, which leads to the damage of the refractory material in the furnace.
Disclosure of Invention
The invention aims to provide a gas heat value regulating method of a hydrogen-rich carbon circulating oxygen blast furnace, which adopts a flue gas pressurizing and recycling technology of a gas heating furnace, so that the problem that the high heat value gas of the hydrogen-rich carbon circulating oxygen blast furnace cannot be directly burned can be solved, and the effect of reducing carbon emission by recycling the waste heat of the gas can be achieved.
In order to achieve the above purpose, the present invention provides the following technical solutions: the method for regulating and controlling the gas heat value of the hydrogen-rich carbon circulating oxygen blast furnace comprises the steps of 1) starting a furnace, wherein furnace gas enters a gas heating furnace through a furnace gas combustion valve, a cut-off valve and a regulating valve, furnace air enters the gas heating furnace through an air combustion valve, a cut-off valve and a regulating valve, high-temperature flue gas is generated by combustion of the furnace gas and the furnace air in the gas heating furnace, and the high-temperature flue gas is discharged through a flue valve and a flue after passing through a flue after heating checker bricks in the furnace; 2) The flue gas generated after combustion in the gas heating furnace is partially pressurized by the pressurizing fan through the flue and then is recycled to the heating gas pipe network according to a certain proportion, and the recycling and recycling of the flue gas of the heating furnace are realizedThe purpose of adjusting the heat value of the gas entering the heating furnace is achieved; 3) After part of flue gas is pressurized by a pressurizing fan, a certain amount of flue gas is regulated by a flow regulating valve to enter a gas pipe network of the combustion furnace, so that the accurate control of the heat value of the gas of the combustion furnace is realized; 4) In the furnace burning period, CO and O are arranged on the flue gas recycling pipeline 2 On-line analysis monitor for real-time CO and O of flue 2 The content is monitored, and the monitoring data is transmitted into a gas heating furnace burning control system, and the CO and O in the recycled flue gas are realized in the following way 2 Always kept below 1%, 5), exceeding CO during the burning, achieving the purpose of reducing CO in the flue gas by increasing the amount of the burning air or reducing the amount of the burning gas, or achieving the purpose of reducing the concentration of CO in the burning gas by increasing the amount of the recycled flue gas, thereby achieving the purpose of reducing the concentration of CO in the flue gas; 6) O during the burning of furnace 2 Exceeding standard, and reducing O in flue gas by increasing the gas amount of the burning furnace or reducing the air amount of the burning furnace 2 Or the CO concentration in the gas of the combustion furnace is increased by reducing the recycled flue gas amount, thereby reducing the O in the flue gas 2 Concentration purposes; 7) The heating value of the gas entering the gas heating furnace is controlled between 3500 and 5000kj/m by a flue gas pressurizing and recycling technology 3 The method comprises the steps of carrying out a first treatment on the surface of the 8) Recycling the flue gas with the average temperature of 120 ℃ into a gas heating furnace by a flue gas pressurizing and recycling technology, so as to realize waste heat recovery; 9) The pressurized and recycled flue gas pipeline is provided with a quick-cutting valve to realize the quick-cutting function of flue gas, and is provided with a flowmeter to realize the accurate measurement of flow; 10 The pressurized flue gas firstly enters a gas main pipe of the combustion furnace, the combustion furnace is started, a gas shut-off valve, a regulating valve and a gas combustion valve of the combustion furnace are firstly opened, after the combustion of the gas heating furnace is normal, the pressurized flue gas shut-off valve is opened, then the flue gas regulating valve is opened according to the set flue gas flow action, the combustion furnace is ended, the combustion furnace gas combustion valve, the shut-off valve and the regulating valve are firstly closed, then the flue gas regulating valve for pressurized recycling is closed, and if all the gas heating furnaces exit the combustion furnace, the pressurized flue gas shut-off valve 4 for recycling is closed; 11 After the gas heating furnace is finished, the process enters into a decarburization gas heating process, a decarburization gas cold gas valve is opened, a heated hot gas valve is opened,the decarbonized gas passes through a high Wen Gezi brick in a gas heating furnace, obtains heat and rises to more than 1100 ℃, and enters a blast furnace for recycling through a hot gas valve hot gas pipeline.
The purpose of recycling the output top gas after decarburization is achieved by the hydrogen-rich carbon circulating oxygen blast furnace through total oxygen smelting, decarburization gas enters the blast furnace again and is heated to more than 1100 ℃ through the gas heating furnace, the gas heating furnace firstly heats checker bricks in the heating furnace through burning furnace gas and combustion air which are introduced into the heating furnace, then the normal-temperature decarburization gas is sent to the gas heating furnace, the decarburization gas is quickly heated to more than 1100 ℃ through the checker bricks of the gas heating furnace and is sent out to the blast furnace for recycling, and 3 gas heating furnaces are usually arranged for recycling, the heating effect is determined by the heat value of the gas for heating the checker bricks of the heating furnace, the heat value is too high, the checker bricks and refractory materials in the heating furnace are irreversibly burnt and damaged, and the heat value is too low to achieve the heating effect; the hydrogen-rich carbon circulating oxygen blast furnace gas heating furnace adopts the inner lattice brick of the blast furnace top output gas heating furnace, and the heat value of the output gas is far higher than that of the traditional blast furnace and 7000kj/m due to the adoption of the total oxygen smelting process 3 The invention adopts the flue gas pressurizing and recycling technology of the gas heating furnace, thus solving the problem that the high-heat-value gas of the hydrogen-rich carbon circulating oxygen blast furnace cannot be directly burned, and achieving the effects of recycling the waste heat of the gas and reducing the carbon emission.
Drawings
FIG. 1 is a schematic diagram of the present invention;
in the figure: 1. the gas combustion valve 2 is provided with a furnace gas cut-off valve 3, a furnace gas regulating valve 4, a flue gas cut-off valve 5, a flue gas regulating valve 6, a furnace air regulating valve 7, a furnace air cut-off valve 8, an air combustion valve 9, a gas heating furnace 10, a hot gas valve 11, a cold gas valve 12, a flue valve 13, a flue 14, a flue pipe 15 and O 2 Detection 16, CO detection 17, and a flue gas pressurization fan.
Description of the embodiments
The gas heat value regulating and controlling method of the hydrogen-rich carbon circulating oxygen blast furnace comprises the following operation steps:
the method is characterized in that the burning furnace is started, the burning furnace gas enters a gas heating furnace through a burning furnace gas combustion valve 1, a cut-off valve 2 and a regulating valve 3, the burning furnace air enters the gas heating furnace through an air combustion valve 8, a cut-off valve 7 and a regulating valve 6, the burning furnace gas and the burning furnace air are burnt in the gas heating furnace to generate high-temperature smoke, and the high-temperature smoke is discharged from a flue pipe 14 after the lattice bricks in the furnace are heated through a flue valve 12 and a flue 13.
The flue gas generated after combustion in the gas heating furnace is partially pressurized by the pressurizing fan 17 through the flue 13 and then is recycled to the heating gas pipe network according to a certain proportion. The gas heat value of the gas entering the heating furnace is adjusted by recycling and matching the flue gas of the heating furnace.
2. After part of flue gas is pressurized by the pressurizing fan 17, a certain amount of flue gas is regulated by the flow regulating valve 5 to enter a gas pipe network of the combustion furnace, so that the accurate control of the heat value of the gas of the combustion furnace is realized.
3. During the burning period, the flue gas recycling pipeline is provided with a CO on-line analysis monitor 16 and O 2 The on-line analysis monitor 15 monitors the CO and O2 contents of the flue in real time and transmits the monitoring data to the gas heating furnace burning control system. The CO and O2 in the recycled flue gas are always kept below 1% by the following method.
4. The CO exceeds standard during the burning process, and the purpose of reducing the CO in the flue gas is achieved by increasing the burning air quantity or reducing the burning gas quantity. Or the CO concentration in the gas of the burning furnace is reduced by increasing the recycled flue gas amount, so that the purpose of reducing the CO concentration in the flue gas is achieved.
5. The O2 exceeds standard during the burning process, and the purpose of reducing the O2 in the flue gas can be achieved by increasing the gas amount of the burning furnace or reducing the air amount of the burning furnace. Or the CO concentration in the gas of the combustion furnace is increased by reducing the recycled flue gas amount, so that the purpose of reducing the O2 concentration in the flue gas is achieved.
6. The heating value of the gas entering the gas heating furnace is controlled to 3500-5000kj/m3 by the flue gas pressurizing and recycling technology.
7. And (3) recycling the flue gas with the average temperature of 120 ℃ into a gas heating furnace by using a flue gas pressurization recycling technology, so as to realize the waste heat recovery effect.
8. The flue gas pipeline recycled after pressurization is provided with a quick-cutting valve 4, so that the flue gas quick-cutting function is realized, and the flow meter is arranged, so that the accurate measurement of the flow is realized.
9. The pressurized flue gas firstly enters a gas main pipe of the combustion furnace, the combustion furnace is started, a gas cut-off valve 2, a regulating valve 3 and a gas combustion valve 1 of the combustion furnace are firstly opened, after the gas heating furnace 9 burns normally, the pressurized flue gas cut-off valve 4 is opened, then a flue gas regulating valve 5 is opened according to the set flue gas flow, and after the combustion furnace is finished, the combustion furnace gas combustion valve 1, the cut-off valve 2 and the regulating valve 3 are firstly closed, and then the flue gas regulating valve 5 for pressurized recycling is closed. If all the gas heating furnaces exit the burning furnace, the flue gas cut-off valve 4 for pressurization and cyclic utilization must be closed.
10. After the gas heating furnace is burned, the process enters a decarburization gas heating process, a decarburization gas cold gas valve 11 is opened, a heated hot gas valve 10 is opened, decarburization gas passes through a high Wen Gezi brick in the gas heating furnace, the obtained heat is heated to more than 1100 ℃, and the obtained heat enters a blast furnace through a hot gas pipeline of the hot gas valve 10 for recycling. The aim of reducing the carbon emission of the blast furnace process is achieved.
Claims (1)
1. A method for regulating and controlling the gas heat value of a hydrogen-rich carbon circulating oxygen blast furnace is characterized by comprising the following steps of: 1) The method comprises the steps that (1) the burning furnace is started, the burning furnace gas enters a gas heating furnace through a burning furnace gas combustion valve, a cut-off valve and a regulating valve, the burning furnace air enters the gas heating furnace through an air combustion valve, a cut-off valve and a regulating valve, high-temperature smoke is generated by burning the burning furnace gas and the burning furnace air in the gas heating furnace, and the high-temperature smoke is discharged from a flue pipe after the lattice bricks in the furnace are heated, and the smoke is discharged from the flue pipe through a flue valve and a flue; 2) The flue gas generated after combustion in the gas heating furnace is partially pressurized by the pressurizing fan through the flue and then is recycled to the heating gas pipe network according to a certain proportion, and the purpose of adjusting the heat value of the gas entering the heating furnace is realized by recycling the flue gas of the heating furnace; 3) After part of flue gas is pressurized by a pressurizing fan, a certain amount of flue gas is regulated by a flow regulating valve to enter a gas pipe network of the combustion furnace, so that the accurate control of the heat value of the gas of the combustion furnace is realized; 4) In the furnace burning period, CO and O are arranged on the flue gas recycling pipeline 2 On-line analysis monitor for real-time CO and O of flue 2 The content is monitored, and the monitoring data is transmitted into a gas heating furnace burning control system, and the CO and O in the recycled flue gas are realized in the following way 2 Always kept below 1%, 5), exceeding CO during the burning, achieving the purpose of reducing CO in the flue gas by increasing the amount of the burning air or reducing the amount of the burning gas, or achieving the purpose of reducing the concentration of CO in the burning gas by increasing the amount of the recycled flue gas, thereby achieving the purpose of reducing the concentration of CO in the flue gas; 6) O during the burning of furnace 2 Exceeding standard, and reducing O in flue gas by increasing the gas amount of the burning furnace or reducing the air amount of the burning furnace 2 Or the CO concentration in the gas of the combustion furnace is increased by reducing the recycled flue gas amount, thereby reducing the O in the flue gas 2 Concentration purposes; 7) The heating value of the gas entering the gas heating furnace is controlled between 3500 and 5000kj/m by a flue gas pressurizing and recycling technology 3 The method comprises the steps of carrying out a first treatment on the surface of the 8) Recycling the flue gas with the average temperature of 120 ℃ into a gas heating furnace by a flue gas pressurizing and recycling technology, so as to realize waste heat recovery; 9) The pressurized and recycled flue gas pipeline is provided with a quick-cutting valve to realize the quick-cutting function of flue gas, and is provided with a flowmeter to realize the accurate measurement of flow; 10 The pressurized flue gas firstly enters a gas main pipe of the combustion furnace, the combustion furnace is started, a gas shut-off valve, a regulating valve and a gas combustion valve of the combustion furnace are firstly opened, after the combustion of the gas heating furnace is normal, the pressurized flue gas shut-off valve is opened, then the flue gas regulating valve is opened according to the set flue gas flow action, the combustion furnace is ended, the combustion furnace gas combustion valve, the shut-off valve and the regulating valve are firstly closed, then the flue gas regulating valve for pressurized recycling is closed, and if all the gas heating furnaces exit the combustion furnace, the pressurized flue gas shut-off valve 4 for recycling is closed; 11 After the gas heating furnace is finished, the process enters a decarburization gas heating process, a decarburization gas cooling gas valve is opened, then a heated hot gas valve is opened, decarburization gas passes through a high Wen Gezi brick in the gas heating furnace, the obtained heat is heated to more than 1100 ℃, and the obtained heat enters a blast furnace through a hot gas valve hot gas pipeline for recycling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311440252.1A CN117512241A (en) | 2023-11-01 | 2023-11-01 | Gas heat value regulating and controlling method of hydrogen-rich carbon circulating oxygen blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311440252.1A CN117512241A (en) | 2023-11-01 | 2023-11-01 | Gas heat value regulating and controlling method of hydrogen-rich carbon circulating oxygen blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117512241A true CN117512241A (en) | 2024-02-06 |
Family
ID=89748729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311440252.1A Pending CN117512241A (en) | 2023-11-01 | 2023-11-01 | Gas heat value regulating and controlling method of hydrogen-rich carbon circulating oxygen blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117512241A (en) |
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2023
- 2023-11-01 CN CN202311440252.1A patent/CN117512241A/en active Pending
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