CN117701809A - System and method for controlling heat value of converter gas - Google Patents
System and method for controlling heat value of converter gas Download PDFInfo
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- CN117701809A CN117701809A CN202311683713.8A CN202311683713A CN117701809A CN 117701809 A CN117701809 A CN 117701809A CN 202311683713 A CN202311683713 A CN 202311683713A CN 117701809 A CN117701809 A CN 117701809A
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- value
- converter
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- flue
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003546 flue gas Substances 0.000 claims abstract description 36
- 238000004868 gas analysis Methods 0.000 claims abstract description 22
- 239000000779 smoke Substances 0.000 claims abstract description 18
- 230000009467 reduction Effects 0.000 claims abstract description 13
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 14
- 230000003247 decreasing effect Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 7
- 239000012717 electrostatic precipitator Substances 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 230000007812 deficiency Effects 0.000 claims description 4
- 230000002950 deficient Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims 5
- 238000011084 recovery Methods 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- -1 and meanwhile Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a system and a method for controlling the calorific value of converter gas, and belongs to the technical field of metallurgical energy recovery control systems and methods. The technical scheme of the invention is as follows: and carrying out coupling analysis on the data by utilizing a converter flue gas analysis system to sample and analyze the components of the converter flue gas and detecting data of a furnace mouth micro-differential pressure system to a furnace mouth pressure value, and after judging trend of the components of the flue gas, transmitting the data to a fan system PLC, and adjusting the furnace mouth flue gas pressure value by adjusting the rotating speed of the fan system to indirectly realize adjustment of air quantity mixed in the flue gas. The beneficial effects of the invention are as follows: the method can not only effectively prevent the reduction of the heat value of the gas, but also can carry out a regulation and control means for improving the recovery amount when the heat value of the gas is ultrahigh, reduce the risk of smoke overflow, ensure that the converter can achieve higher gas recovery amount under the condition of obtaining higher heat value of the gas, create conditions for energy conservation, consumption reduction, cost reduction and income increase of steel enterprises, and reduce the unorganized emission probability of the smoke.
Description
Technical Field
The invention relates to a system and a method for controlling the calorific value of converter gas, and belongs to the technical field of metallurgical energy recovery control systems and methods.
Background
With the improvement of requirements such as energy utilization rate of steel plants, the improvement of the heat value of converter gas becomes a focus of competition for reducing the cost of steel enterprises, and energy conservation, consumption reduction, cost reduction, efficiency improvement and energy recycling become an important subject for sustainable development of enterprises.
The recovery of converter gas is widely used as an effective means for recycling energy sources of steel plants, but the control of the heat value of the converter gas is not effective monitoring, controlling and adjusting means, and particularly, how to control the heat value of the gas to be stable in a certain range is more difficult. The converter gas is a combustible mixed gas with CO content ranging from 40% to 60% generated by the reaction of oxygen and carbon in a molten pool in the blowing process of oxygen in a steelmaking converter, and the heat value of the combustible mixed gas is greatly influenced by fluctuation of the CO content. Fluctuations in CO content are mainly due to instability of the converter during converting, for example: the control of the fluctuation of the content of the oxygen lance is difficult due to multiple factors such as the lance position of the oxygen lance, the temperature of a molten pool, the use of slag forming materials and the like.
In order to ensure the gas recovery heat value, the traditional converter gas recovery system only carries out speed increasing and decreasing adjustment within a fixed time range, and a fan only sets a fixed high-speed and low-speed operation interval according to experience, so that dynamic adjustment cannot be achieved. When the converter blows carbon and oxygen to react vigorously, the converter cannot speed up in time and receive more coal gas, and meanwhile, smoke dust can overflow; in contrast, when the converter converting carbon-oxygen reaction is inhibited, the converter converting carbon-oxygen reaction cannot be reduced in time to ensure the stability of the heat value of the coal gas. In a word, the dynamic control of the calorific value of the gas in the converting process of the converter lacks an effective control means, so that environmental protection accidents such as energy waste or smoke overflow can be caused.
Disclosure of Invention
The invention aims to provide a system and a method for controlling the heat value of converter gas, which can effectively prevent the heat value of the gas from being reduced by the CO data of a converter flue gas analysis system and the pressure data of a furnace mouth micro differential pressure device together in the control of the heat value of the gas, can also carry out a regulation and control means for improving the recovery amount when the heat value of the gas is ultrahigh, can reduce the risk of smoke overflow, can realize higher gas recovery amount under the condition of obtaining higher heat value of the gas by a converter, creates conditions for energy conservation, consumption reduction, cost reduction and income increase of steel enterprises, and simultaneously reduces the unorganized emission probability of smoke dust, thereby effectively solving the problems in the background art.
The technical scheme of the invention is as follows: the utility model provides a system for controlling converter gas calorific value, contains converter, stove mouth micro differential pressure system, flue gas analysis system, evaporative cooler, electrostatic precipitator, fan system, gas holder and diffusing chimney, the flue is installed on the top of converter, and stove mouth micro differential pressure system installs in the flue inflection point department that is close to stove mouth upper portion, and flue gas analysis system installs in the terminal inflection point department in flue upper portion, and the end-to-end connection evaporative cooler of flue, evaporative cooler, electrostatic precipitator and fan system connect gradually, and the gas holder is connected respectively to fan system's output and diffusing chimney.
The pressure detection range of the furnace mouth micro differential pressure system is +/-300 Pa.
The detection range of the converter flue gas analysis system for CO is 0-100%.
A method of controlling the calorific value of converter gas comprising the steps of: (1) A large amount of converter gas is generated in the converter blowing process and enters a flue, and the CO content data in the gas measured by a flue gas analysis system is compared with a furnace mouth pressure value measured by a furnace mouth micro-differential pressure system to judge; (2) If the furnace mouth pressure value is in a decreasing trend and the smoke CO content value is in a decreasing trend in the same three continuous sampling periods, judging that the air is excessive or the carbon oxygen reaction in the furnace is weak, correspondingly outputting a dedusting fan speed-down running signal and sending the signal to a fan PLC for execution; (3) If the furnace mouth pressure value is in an increasing trend and the smoke CO content value is in an increasing trend in the same three continuous sampling periods, judging that air is deficient or a strong carbon-oxygen reaction signal in the furnace is generated, correspondingly outputting a dust removal fan speed-up running signal and sending the signal to a fan PLC for execution.
The trend of the furnace mouth pressure value measured by the furnace mouth micro-differential pressure system and the trend of the flue gas CO value measured by the flue gas analysis system are required to meet the requirements at the same time, and the sending of the judgment signal can be triggered.
The sampling frequency of the smoke component value and the furnace mouth pressure value uses the same frequency of once for 2 seconds, namely, every 2 seconds is a sampling period.
The furnace mouth pressure value reducing/increasing trend is that the pressure value is reduced/increased by 3Pa in three continuous detection periods, and the flue gas CO content value reducing/increasing trend is that the CO content is reduced/increased by 1% in three continuous detection periods.
And when the judgment is that the air is excessive or the carbon oxygen reaction in the furnace is weak, outputting a 5% speed reduction operation signal of the dust removal fan correspondingly by the signal, and sending the signal to a fan PLC for execution.
When the air deficiency or the strong carbon-oxygen reaction signal in the furnace is judged, the signal correspondingly outputs a 5% speed-up running signal of the dust removal fan and sends the speed-up running signal to the fan PLC for execution.
The beneficial effects of the invention are as follows: the CO data of the converter flue gas analysis system and the pressure data of the furnace mouth micro differential pressure device are jointly involved in the control of the gas heat value, so that the reduction of the gas heat value can be effectively prevented, a regulation and control means for improving the recovery amount can be carried out when the gas heat value is ultrahigh, the risk of smoke overflow is reduced, the converter can achieve higher gas recovery amount under the condition of obtaining higher gas heat value, conditions are created for energy conservation, consumption reduction, cost reduction and income increase of steel enterprises, and the unstructured emission probability of smoke is reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
in the figure: the device comprises a converter 1, a furnace mouth micro-differential pressure system 2, a flue 3, a flue gas analysis system 4, an evaporative cooler 5, an electric dust collector 6, a fan system 7, a gas tank 8 and a diffusing chimney 9.
Description of the embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments, and it is apparent that the described embodiments are a small part of the embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
The utility model provides a system for controlling converter gas calorific value, contains converter 1, fire door micro differential pressure system 2, flue 3, flue gas analysis system 4, evaporative cooler 5, electrostatic precipitator 6, fan system 7, gas holder 8 and the chimney 9 that diffuses, the top at converter 1 is installed to flue 3, and fire door micro differential pressure system 2 is installed in the flue 3 inflection point department that is close to fire door upper portion, and flue gas analysis system 4 installs the inflection point department at flue 3 upper portion end, and evaporative cooler 5 is connected to the end of flue 3, and evaporative cooler 5, electrostatic precipitator 6 and fan system 7 connect gradually, and gas holder 8 and chimney 9 that diffuses are connected respectively to fan system 7's output.
The pressure detection range of the furnace mouth micro differential pressure system 2 is +/-300 Pa.
The detection range of the converter flue gas analysis system 4 for CO is 0-100%.
A method of controlling the calorific value of converter gas comprising the steps of: (1) A large amount of converter gas is generated in the converter blowing process and enters a flue, and the CO content data in the gas measured by a flue gas analysis system is compared with a furnace mouth pressure value measured by a furnace mouth micro-differential pressure system to judge; (2) If the furnace mouth pressure value is in a decreasing trend and the smoke CO content value is in a decreasing trend in the same three continuous sampling periods, judging that the air is excessive or the carbon oxygen reaction in the furnace is weak, correspondingly outputting a dedusting fan speed-down running signal and sending the signal to a fan PLC for execution; (3) If the furnace mouth pressure value is in an increasing trend and the smoke CO content value is in an increasing trend in the same three continuous sampling periods, judging that air is deficient or a strong carbon-oxygen reaction signal in the furnace is generated, correspondingly outputting a dust removal fan speed-up running signal and sending the signal to a fan PLC for execution.
The trend of the furnace mouth pressure value measured by the furnace mouth micro-differential pressure system and the trend of the flue gas CO value measured by the flue gas analysis system are required to meet the requirements at the same time, and the sending of the judgment signal can be triggered.
The sampling frequency of the smoke component value and the furnace mouth pressure value uses the same frequency of once for 2 seconds, namely, every 2 seconds is a sampling period.
The furnace mouth pressure value reducing/increasing trend is that the pressure value is reduced/increased by 3Pa in three continuous detection periods, and the flue gas CO content value reducing/increasing trend is that the CO content is reduced/increased by 1% in three continuous detection periods.
And when the judgment is that the air is excessive or the carbon oxygen reaction in the furnace is weak, outputting a 5% speed reduction operation signal of the dust removal fan correspondingly by the signal, and sending the signal to a fan PLC for execution.
When the air deficiency or the strong carbon-oxygen reaction signal in the furnace is judged, the signal correspondingly outputs a 5% speed-up running signal of the dust removal fan and sends the speed-up running signal to the fan PLC for execution.
In practical application, a large amount of converter gas is generated in the converting process of the converter 1 and enters the flue 3, the data of the CO content in the gas measured by the flue gas analysis system 4 and the pressure value of the furnace mouth measured by the furnace mouth micro differential pressure 2 device are compared and judged, if the pressure value of the furnace mouth is a decreasing trend in the same three continuous sampling periods and the CO value of the flue gas is a decreasing trend, the signal is judged to be an air excess or weak carbon-oxygen reaction signal in the furnace, the signal correspondingly outputs a 5% speed-down running signal of the dust removal fan 7 and is sent to the fan PLC for execution, and the logic judgment is performed by interlocking control with the rotating speed of the fan, so that the rotating speed of the fan is reduced, the pressure in the flue is increased, the operation of the furnace mouth pressure in a positive pressure range (30-60 Pa) is ensured, and the air suction quantity is reduced, thereby achieving the purpose of improving the CO generation quantity; otherwise, if the pressure value of the furnace mouth is in an increasing trend within the same three continuous sampling periods, and the CO value of the flue gas analysis is in an increasing trend, the flue gas analysis is judged to be air deficiency or a strong carbon-oxygen reaction signal in the furnace, the signal is correspondingly output to the operation signal of the dust removal fan 7 with the speed of 5% and is sent to the fan PLC for execution, the logic judgment is performed by interlocking control with the rotating speed of the fan, so that the rotating speed of the fan is increased, the pressure in the flue is reduced, the operation of the pressure of the furnace mouth within a positive pressure range (30-60 Pa) is ensured, the condition that the flue dust does not overflow is ensured, meanwhile, the peak value of the CO of the flue gas is reduced, and the recovery amount of the converter gas is increased. The trend of the furnace mouth pressure value and the smoke analysis value must meet the requirement at the same time, and the judgment signal can be triggered. The sampling frequency of the flue gas component value and the furnace mouth pressure value is the same frequency used once for 2 seconds. In the process of the rising and falling of the fan, the logic judgment stops running until 5 seconds after the rising and falling action is finished, and the logic judgment is triggered again. The furnace mouth pressure value decreasing/increasing trend is defined as a certain value of pressure value decreasing/increasing in three continuous detection periods, and the flue gas CO content value decreasing/increasing trend is defined as a certain value of CO content decreasing/increasing in three continuous detection periods. The judgment of the fan state is carried out according to the signal of the primary PLC system.
Claims (9)
1. A system for controlling the calorific value of converter gas, characterized in that: contain converter (1), stove mouth micro differential pressure system (2), flue (3), flue gas analysis system (4), evaporative cooler (5), electrostatic precipitator (6), fan system (7), gas holder (8) and stack (9) of diffusing, the top at converter (1) is installed in flue (3) inflection point department near stove mouth upper portion in flue (3) is installed in stove mouth micro differential pressure system (2), flue gas analysis system (4) are installed in the terminal inflection point department in flue (3) upper portion, the end-to-end connection evaporative cooler (5) of flue (3), evaporative cooler (5), electrostatic precipitator (6) and fan system (7) connect gradually, gas holder (8) and stack (9) of diffusing are connected respectively to the output of fan system (7).
2. A system for controlling the calorific value of converter gas according to claim 1, wherein: the pressure detection range of the furnace mouth micro differential pressure system (2) is +/-300 Pa.
3. A system for controlling the calorific value of converter gas according to claim 1, wherein: the detection range of the converter flue gas analysis system (4) for CO is 0-100%.
4. A method of controlling the calorific value of converter gas comprising the steps of: (1) A large amount of converter gas is generated in the converter blowing process and enters a flue, and the CO content data in the gas measured by a flue gas analysis system is compared with a furnace mouth pressure value measured by a furnace mouth micro-differential pressure system to judge; (2) If the furnace mouth pressure value is in a decreasing trend and the smoke CO content value is in a decreasing trend in the same three continuous sampling periods, judging that the air is excessive or the carbon oxygen reaction in the furnace is weak, correspondingly outputting a dedusting fan speed-down running signal and sending the signal to a fan PLC for execution; (3) If the furnace mouth pressure value is in an increasing trend and the smoke CO content value is in an increasing trend in the same three continuous sampling periods, judging that air is deficient or a strong carbon-oxygen reaction signal in the furnace is generated, correspondingly outputting a dust removal fan speed-up running signal and sending the signal to a fan PLC for execution.
5. A method of controlling the heating value of converter gas according to claim 4, wherein: the trend of the furnace mouth pressure value measured by the furnace mouth micro-differential pressure system and the trend of the flue gas CO value measured by the flue gas analysis system are required to meet the requirements at the same time, and the sending of the judgment signal can be triggered.
6. A method of controlling the heating value of converter gas according to claim 4, wherein: the sampling frequency of the smoke component value and the furnace mouth pressure value uses the same frequency of once for 2 seconds, namely, every 2 seconds is a sampling period.
7. A method of controlling the heating value of converter gas according to claim 4, wherein: the furnace mouth pressure value reducing/increasing trend is that the pressure value is reduced/increased by 3Pa in three continuous detection periods, and the flue gas CO content value reducing/increasing trend is that the CO content is reduced/increased by 1% in three continuous detection periods.
8. A method of controlling the heating value of converter gas according to claim 4, wherein: and when the judgment is that the air is excessive or the carbon oxygen reaction in the furnace is weak, outputting a 5% speed reduction operation signal of the dust removal fan correspondingly by the signal, and sending the signal to a fan PLC for execution.
9. A method of controlling the heating value of converter gas according to claim 4, wherein: when the air deficiency or the strong carbon-oxygen reaction signal in the furnace is judged, the signal correspondingly outputs a 5% speed-up running signal of the dust removal fan and sends the speed-up running signal to the fan PLC for execution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311683713.8A CN117701809A (en) | 2023-12-10 | 2023-12-10 | System and method for controlling heat value of converter gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311683713.8A CN117701809A (en) | 2023-12-10 | 2023-12-10 | System and method for controlling heat value of converter gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117701809A true CN117701809A (en) | 2024-03-15 |
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ID=90145461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311683713.8A Pending CN117701809A (en) | 2023-12-10 | 2023-12-10 | System and method for controlling heat value of converter gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117701809A (en) |
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2023
- 2023-12-10 CN CN202311683713.8A patent/CN117701809A/en active Pending
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