CN111778374A - Automatic balancing method for changing pressure of hot blast stove - Google Patents
Automatic balancing method for changing pressure of hot blast stove Download PDFInfo
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- CN111778374A CN111778374A CN202010538537.9A CN202010538537A CN111778374A CN 111778374 A CN111778374 A CN 111778374A CN 202010538537 A CN202010538537 A CN 202010538537A CN 111778374 A CN111778374 A CN 111778374A
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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Abstract
The invention discloses an automatic balancing method for the furnace changing pressure of a hot blast furnace, which comprises the following steps of S1 debugging the pressure supplementing speed and the pressure supplementing amplitude of a fan, S2 detecting whether the working condition of the blast furnace is normal, S3 adjusting module, S4 hot blast furnace changing compensation switch is turned on, S5 hot blast furnace changing is performed, and S6 hot blast furnace changing compensation switch is turned off. The automatic balance method of the hot blast furnace changing pressure shortens the furnace changing time and prolongs the furnace burning time of the hot blast furnace through the hot blast furnace changing, so that the furnace burning process is more stable, the trend curves of the air pressure and the air volume basically run in a straight line, and a stable external environment is brought to the blast furnace; the stable air supply is realized, the normal descending of furnace burden is facilitated, the furnace hearth is uniform and active, the phenomenon that the material speed is suddenly slowed down due to the air reduction during the furnace changing is facilitated to be eliminated, and the stable, high-quality and high-yield blast furnace is facilitated; after the non-disturbance furnace changing of the hot blast furnace is realized, the pressurizing speed of the hot blast furnace can be accelerated, the furnace changing time is reduced, the saved time is used for burning the furnace, or the furnace changing period is shortened.
Description
Technical Field
The invention relates to a pressure balancing method, in particular to an automatic balancing method for the furnace changing pressure of a hot blast furnace.
Background
The hot blast stove is a thermodynamic machine, is widely applied in China in the end of the 20 th century 70 s, and becomes an upgrading product of an electric heat source and a traditional steam power heat source in many industries. The hot blast stove has various types and complete series, and is divided into a hand-burning furnace and a machine-burning furnace by a coal feeding mode, and is divided into a coal furnace, an oil furnace, a gas furnace and the like by fuel types.
The hot blast stove is a device for heating the air supplied by a blower from about 150-. Because the hot blast stove is of a heat accumulating type structure, the hot blast stove needs to be heated for heat accumulation, then air supply is carried out, and heating and air supply are carried out alternately, so that the stove needs to be changed; when the hot blast stove is changed, part of air supply flow of the fan is used for pressurizing a new hot blast stove, and before the pressure is full, the flow and the pressure actually obtained by the blast furnace are lower than the normal air supply working condition. The undisturbed furnace changing function of the hot blast furnace is realized by establishing signal connection between a hot blast furnace control system and a fan control system, combining the furnace changing process of the hot blast furnace with an axial flow fan anti-surge control system and an air quantity and air pressure adjusting system and automatically adjusting the air quantity and the air pressure of a fan by control software in the furnace changing process, thereby solving the problems of the reduction of the air supply flow and the pressure of a blast furnace during the furnace changing of the hot blast furnace and the unbalance of furnace conditions caused by the fluctuation of the air pressure.
Disclosure of Invention
The invention aims to provide an automatic balance method of the furnace changing pressure of a hot blast furnace, which shortens the furnace changing time and prolongs the furnace burning time of the hot blast furnace through the furnace changing of the hot blast furnace, so that the furnace burning process is more stable, the trend curves of the wind pressure and the wind volume basically run in a straight line, and a stable external environment is brought to a blast furnace; the stable air supply is beneficial to normal descending of furnace burden, the furnace hearth is uniform and active, the phenomenon that the material speed is suddenly slowed down due to furnace changing and air reduction is eliminated, and the stable, high-quality and high-yield blast furnace is facilitated; after the hot blast stove is changed without disturbance, the pressurizing speed of the hot blast stove can be accelerated, the stove changing time is reduced, the saved time is used for burning the stove, or the stove changing period is shortened, the stove burning time can be prolonged, the blast furnace is further improved in air temperature or is more stable in air temperature, the action of a pressurizing valve is not required to be controlled manually, the stove changing operation is more standard and simpler, meanwhile, the impact caused by frequently inching the pressurizing valve is reduced, the labor intensity of a hot air worker is greatly reduced, the possibility of reducing operators is provided, the production cost of enterprises is reduced, and the energy conservation and emission reduction are facilitated.
The purpose of the invention can be realized by the following technical scheme:
the automatic balance method of the furnace changing pressure of the hot blast stove comprises the following steps:
s1: and (5) debugging the pressure supplementing speed and the pressure supplementing amplitude of the fan, wherein the pressure supplementing amplitude is matched with the preset opening degree of a pressure supplementing valve of the hot blast stove.
S2: and detecting whether the working condition of the blast furnace is normal or not.
S3: be equipped with pressure control system between first hot-blast furnace control system, the second hot-blast furnace control system and the fan control system, pressure control system is including being located first hot-blast furnace pressure induction module and the second hot-blast furnace control system in first hot-blast furnace control system and the second hot-blast furnace control system respectively, and pressure control system still includes hot-blast furnace pressure and sets for module and control module including being located the quiet leaf angle of fan in the fan control system.
S4: the hot blast stove pressure range is set in the hot blast stove pressure setting module, the hot blast stove pressure range is changed from the first hot blast stove control system to the second hot blast stove control system, and the hot blast stove changing compensation switch is turned on.
S5: the hot-blast furnace begins to trade the stove, pressure and transmission to control module in the second hot-blast furnace are responded to second hot-blast furnace forced induction module, the pressure of will responding to and the pressure of settlement contrast through control module, turn into signal of telecommunication to angle modulation module with the result after the contrast, angle modulation module control quiet leaf angle, the air feed flow that makes the fan increase equals the hot-blast furnace and pressurizes required extra flow, reduce the pressure oscillation of trading the stove in-process, along with pressurizing pressure rising in the process stove, quiet leaf angle can be with slower speed automatic adjustment, return initial position.
S6: the compensation switch for changing the hot blast stove is closed, the angle of the static blade is kept still, and the compensation function for charging air for changing the stove is closed.
Furthermore, the charging valve needs to be opened at one time, so that the pressure can not be balanced in a manner of inching the charging valve.
Furthermore, the blast furnace detects that the undisturbed furnace-changing switch is turned on only when the working condition is normal.
Furthermore, the pressure equalizing valve needs to be debugged and overhauled under the condition of normal production of the blast furnace, and the operation can be carried out only after the undisturbed furnace-changing switch is closed.
Furthermore, the blast furnace plus or minus air needs to avoid the time of changing the blast furnace.
Furthermore, the hot blast stove changes the stove, has shortened the time of changing the stove, prolongs the hot blast stove and burns the stove time, makes the burning process more steady, and wind pressure, amount of wind trend curve are a straight line operation basically, bring stable external environment for the blast furnace.
The invention has the beneficial effects that:
1. the automatic balance method of the hot blast furnace changing pressure shortens the furnace changing time and prolongs the furnace burning time of the hot blast furnace through the hot blast furnace changing, so that the furnace burning process is more stable, the trend curves of the air pressure and the air volume basically run in a straight line, and a stable external environment is brought to the blast furnace;
2. the automatic balance method of the furnace changing pressure of the hot blast furnace realizes stable air supply, is beneficial to normal reduction of furnace burden, ensures that the furnace hearth is uniform and active, is beneficial to eliminating the phenomenon that the material speed is suddenly slowed down due to furnace changing and air reduction, and is beneficial to stable, high-quality and high-yield of a blast furnace;
3. the automatic balance method for the furnace changing pressure of the hot blast furnace can accelerate the charging speed of the hot blast furnace, reduce the furnace changing time, use the saved time for burning the furnace, or shorten the furnace changing period, prolong the furnace burning time, further improve the air temperature of the blast furnace or stabilize the air temperature of the blast furnace, do not need to manually control the action of a charging valve, have more standard and simpler furnace changing operation, reduce the impact caused by frequently clicking the charging valve, greatly reduce the labor intensity of a hot air worker, reduce the possibility of operators, reduce the production cost of enterprises, and be favorable for energy conservation and emission reduction after the hot blast furnace is changed.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the operation of the automatic balancing method of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The automatic balance method of the furnace changing pressure of the hot blast stove comprises the following steps:
s1: the method is characterized in that the pressure supplementing speed and the pressure supplementing amplitude of the fan are debugged, the pressure supplementing amplitude is matched with the preset opening degree of a pressure supplementing valve of the hot blast stove, the pressure supplementing valve is required to be opened at one time, and the pressure can not be balanced in a mode of inching the pressure supplementing valve.
S2: and detecting whether the working condition of the blast furnace is normal or not, whether the blast furnace has conditions of slow wind, damping down and the like or not, and opening the undisturbed furnace-changing switch when the working condition of the blast furnace is normal.
S3: be equipped with pressure control system between first hot-blast furnace control system, the second hot-blast furnace control system and the fan control system, pressure control system is including being located first hot-blast furnace pressure induction module and the second hot-blast furnace control system in first hot-blast furnace control system and the second hot-blast furnace control system respectively, and pressure control system still includes hot-blast furnace pressure and sets for module and control module including being located the quiet leaf angle of fan in the fan control system.
S4: the hot blast stove pressure range is set in the hot blast stove pressure setting module, and the hot blast stove changing compensation switch is switched on from the first hot blast stove control system to the second hot blast stove control system.
S5: the hot-blast furnace begins to trade the stove, pressure and transmission to control module in the second hot-blast furnace are responded to second hot-blast furnace forced induction module, the pressure of will responding to and the pressure of settlement contrast through control module, turn into signal of telecommunication to angle modulation module with the result after the contrast, angle modulation module control quiet leaf angle, the air feed flow that makes the fan increase equals the hot-blast furnace and pressurizes required extra flow, reduce the pressure oscillation of trading the stove in-process, along with pressurizing pressure rising in the process stove, quiet leaf angle can be with slower speed automatic adjustment, return initial position.
S6: the compensation switch for changing the hot blast stove is closed, the angle of the static blade is kept still, and the compensation function for charging air for changing the stove is closed; the pressure equalizing valve needs to be debugged and overhauled under the condition of normal production, and the undisturbed furnace-changing switch is closed for operation; the blast furnace plus or minus air needs to avoid the time of changing the blast furnace.
The hot blast furnace is replaced, the furnace replacing time is shortened, the burning time of the hot blast furnace is prolonged, the burning process is more stable, the trend curves of the wind pressure and the wind volume basically run in a straight line, and a stable external environment is brought to the blast furnace.
Examples
The volume of the blast furnace is 1080m3Each time, the furnace replacement is reduced by 5min and increased by 200m3Air flow/min, changing furnace 24 times per day, air flow 1020m per ton iron consumption3/min；
The yield benefit is that the maintenance days are deducted, and the air quantity can be increased by 1 blast furnace in the whole year according to 360 days of the blast furnace production, namely 5 × 200 × 24 × 360-8640000 m3；
The yield is increased year by year: 8640000 ÷ 1020 ÷ 8470.6 t;
the annual economic benefit brought by yield increase: the blast furnace increases the economic benefit by 500 yuan per ton iron average economic benefit: 8470.6 × 500 ═ 423.5 ten thousand yuan.
The blower increases power consumption: taking a 10 × 104V motor as an example, the current is increased by 30A within 8min of furnace replacement each time, the furnace replacement is performed 24 times every day, the electricity charge per degree is calculated by 0.5 yuan, and the electricity charge is increased all the year round: 8 multiplied by 24 divided by 60 multiplied by 30 (10 multiplied by 104) multiplied by 0.5 multiplied by 362 divided by 1000 ═ 173.8 ten thousand yuan, production cost of enterprises is reduced, and energy conservation and emission reduction are facilitated.
Blast furnace smelting requires stable external conditions and small fluctuation range, and the goals of reducing material collapse and improving furnace condition smooth running are pursued by blast furnace operators. Therefore, under the condition of certain raw fuel, stable air supply is favorable for normal descending of furnace burden, the furnace hearth is uniform and active, the phenomenon that the material speed is suddenly slowed down due to furnace change and air reduction is favorably eliminated, and the stable, high-quality and high-yield blast furnace is favorably realized; realize the hot-blast furnace after the noninterference furnace change, can accelerate the hot-blast furnace pressurizing speed, reduce the furnace change time, the time that will practice thrift down is used for burning the stove, perhaps shorten the furnace change cycle, can prolong the furnace burning time, make the blast furnace further improve the wind temperature or make the blast furnace wind temperature more stable, do not need the action of manual control pressurizing valve, the furnace change operation is more normal, it is simpler, the impact that the pressurizing valve caused has frequently been moved to the inching has been reduced simultaneously, hot-blast worker intensity of labour reduces by a wide margin, possess reduction operating personnel's possibility, be favorable to reducing the ironmaking cost.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (6)
1. The automatic balance method of the furnace changing pressure of the hot blast stove is characterized by comprising the following steps:
s1: debugging the pressure supplementing speed and the pressure supplementing amplitude of the fan, wherein the pressure supplementing amplitude is matched with the preset opening degree of a pressure supplementing valve of the hot blast stove;
s2: detecting whether the working condition of the blast furnace is normal or not;
s3: a pressure control system is arranged among the first hot blast stove control system, the second hot blast stove control system and the fan control system, the pressure control system comprises a first hot blast stove pressure induction module and a second hot blast stove control system which are respectively positioned in the first hot blast stove control system and the second hot blast stove control system, the pressure control system comprises a fan stationary blade angle adjusting module positioned in the fan control system, and the pressure control system also comprises a hot blast stove pressure setting module and a control module;
s4: setting a hot blast stove pressure range in a hot blast stove pressure setting module, switching from a first hot blast stove control system to a second hot blast stove control system, and opening a hot blast stove change compensation switch;
s5: the hot blast stove starts to change the stove, the pressure induction module of the second hot blast stove induces the pressure in the second hot blast stove and transmits the pressure to the control module, the induced pressure is compared with the set pressure through the control module, the compared result is converted into an electric signal and transmitted to the angle adjusting module, the angle adjusting module controls the angle of the stationary blade, the air supply flow increased by the fan is equal to the extra flow required by the pressurization of the hot blast stove, the pressure fluctuation in the stove changing process is reduced, and the angle of the stationary blade can be automatically adjusted at a slower speed along with the rise of the pressure in the stove in the pressurizing process and returns to the initial position;
s6: the compensation switch for changing the hot blast stove is closed, the angle of the static blade is kept still, and the compensation function for charging air for changing the stove is closed.
2. The automatic balancing method for the furnace changing pressure of the hot blast stove according to claim 1, wherein the pressure charging valve needs to be opened at one time, and the pressure can not be balanced in a way of inching the pressure charging valve.
3. The automatic balancing method for the furnace changing pressure of the hot blast stove according to claim 1, characterized in that the undisturbed furnace changing switch is opened only when the working condition of the blast furnace is detected to be normal.
4. The automatic balance method for the furnace change pressure of the hot blast stove according to claim 1, wherein the operation can be performed only after an undisturbed furnace change switch is closed by debugging and overhauling a pressure equalizing valve under the condition of normal production of the blast furnace.
5. The automatic balancing method of the furnace change pressure of the hot blast stove according to claim 1, wherein the blast furnace plus or minus air requires avoiding the time of the furnace change.
6. The automatic balance method of the changing pressure of the hot blast stove according to claim 1, wherein the changing of the hot blast stove shortens the changing time and prolongs the burning time of the hot blast stove, so that the burning process is more stable, and the trend curves of the wind pressure and the wind volume basically run in a straight line to bring a stable external environment for the blast furnace.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112760439A (en) * | 2019-11-01 | 2021-05-07 | 成都成发科能动力工程有限公司 | Undisturbed furnace change control method for hot blast furnace |
| CN113564294A (en) * | 2021-07-29 | 2021-10-29 | 郑州豫兴热风炉科技有限公司 | Fluctuation-free furnace change efficient conversion device for hot blast stove and control method |
| CN114959147A (en) * | 2022-06-02 | 2022-08-30 | 日照钢铁控股集团有限公司 | Blast furnace hot blast stove pressure stabilizing furnace changing method, device and equipment |
| CN114990271A (en) * | 2022-06-29 | 2022-09-02 | 马鞍山钢铁股份有限公司 | Linear adjustment method for furnace changing stress of blast furnace hot blast pipe system |
| CN115044721A (en) * | 2022-06-29 | 2022-09-13 | 马鞍山钢铁股份有限公司 | System and method for detecting stress of blast furnace hot blast pipe system and linearly controlling furnace changing stress |
| CN115198048A (en) * | 2022-06-29 | 2022-10-18 | 马鞍山钢铁股份有限公司 | Blast furnace hot air system capable of realizing furnace replacement stress monitoring |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09217104A (en) * | 1996-02-09 | 1997-08-19 | Nisshin Steel Co Ltd | Operation method for hot stove |
| KR19990071316A (en) * | 1998-02-28 | 1999-09-27 | 이구택 | Balancing pressure control method of blast furnace hot stove |
| JP2002294316A (en) * | 2001-04-03 | 2002-10-09 | Nippon Steel Corp | Method for controlling pressure of hot stove |
| CN203307364U (en) * | 2013-05-31 | 2013-11-27 | 首钢京唐钢铁联合有限责任公司 | Automatic control system of blower |
| CN103924021A (en) * | 2014-03-24 | 2014-07-16 | 上海金自天正信息技术有限公司 | Blast furnace and hot blast stove constant-pressure changing system and method thereof |
| CN104232823A (en) * | 2014-09-30 | 2014-12-24 | 江苏永钢集团有限公司 | Control method for furnace exchange of hot air furnace under constant pressure |
-
2020
- 2020-06-13 CN CN202010538537.9A patent/CN111778374A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09217104A (en) * | 1996-02-09 | 1997-08-19 | Nisshin Steel Co Ltd | Operation method for hot stove |
| KR19990071316A (en) * | 1998-02-28 | 1999-09-27 | 이구택 | Balancing pressure control method of blast furnace hot stove |
| JP2002294316A (en) * | 2001-04-03 | 2002-10-09 | Nippon Steel Corp | Method for controlling pressure of hot stove |
| CN203307364U (en) * | 2013-05-31 | 2013-11-27 | 首钢京唐钢铁联合有限责任公司 | Automatic control system of blower |
| CN103924021A (en) * | 2014-03-24 | 2014-07-16 | 上海金自天正信息技术有限公司 | Blast furnace and hot blast stove constant-pressure changing system and method thereof |
| CN104232823A (en) * | 2014-09-30 | 2014-12-24 | 江苏永钢集团有限公司 | Control method for furnace exchange of hot air furnace under constant pressure |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112760439A (en) * | 2019-11-01 | 2021-05-07 | 成都成发科能动力工程有限公司 | Undisturbed furnace change control method for hot blast furnace |
| CN112760439B (en) * | 2019-11-01 | 2023-01-17 | 成都成发科能动力工程有限公司 | Undisturbed furnace change control method for hot blast furnace |
| CN113564294A (en) * | 2021-07-29 | 2021-10-29 | 郑州豫兴热风炉科技有限公司 | Fluctuation-free furnace change efficient conversion device for hot blast stove and control method |
| CN114959147A (en) * | 2022-06-02 | 2022-08-30 | 日照钢铁控股集团有限公司 | Blast furnace hot blast stove pressure stabilizing furnace changing method, device and equipment |
| CN114990271A (en) * | 2022-06-29 | 2022-09-02 | 马鞍山钢铁股份有限公司 | Linear adjustment method for furnace changing stress of blast furnace hot blast pipe system |
| CN115044721A (en) * | 2022-06-29 | 2022-09-13 | 马鞍山钢铁股份有限公司 | System and method for detecting stress of blast furnace hot blast pipe system and linearly controlling furnace changing stress |
| CN115198048A (en) * | 2022-06-29 | 2022-10-18 | 马鞍山钢铁股份有限公司 | Blast furnace hot air system capable of realizing furnace replacement stress monitoring |
| CN115198048B (en) * | 2022-06-29 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Blast furnace hot air system capable of realizing furnace replacement stress monitoring |
| CN115044721B (en) * | 2022-06-29 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Blast furnace hot air pipe system stress detection and furnace replacement stress linear control method |
| CN114990271B (en) * | 2022-06-29 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Furnace changing stress linear adjusting method for blast furnace hot air pipe system |
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Application publication date: 20201016 |