CN111996326A - Air distribution device of metallurgical blast furnace and control method thereof - Google Patents
Air distribution device of metallurgical blast furnace and control method thereof Download PDFInfo
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Abstract
The invention provides a metallurgical blast furnace air distribution device applied to the technical field of metallurgical blast furnaces, and also relates to a control method of the metallurgical blast furnace air distribution device, wherein a fan I (1) of the metallurgical blast furnace air distribution device is communicated with an air supply main pipe I (3), a pressure sensor I (4) is arranged on the air supply main pipe I (3), a fan II (2) is communicated with an air supply main pipe II (5), a pressure sensor II (6) is arranged on the air supply main pipe II (5), the air supply main pipe I (3) is communicated with the air supply main pipe II (5) through an air distribution pipeline (7), and an air distribution valve (8) is arranged on the air distribution pipeline (7), so that the metallurgical blast furnace air distribution device and the control method thereof can fundamentally solve the problem of the safety and reliability of the metallurgical blast furnace air distribution process under the conditions that one fan has fault air supply interruption and the pressure parameter difference between the two air supply main pipes is large, ensuring the safe production of the blast furnace and the fan.
Description
Technical Field
The invention belongs to the technical field of metallurgical blast furnaces, and particularly relates to a metallurgical blast furnace air distributing device and a control method of the metallurgical blast furnace air distributing device.
Background
The production characteristics of the blast furnace determine that the fan and the blast furnace are in a one-to-one air supply mode, once the fan breaks down and stops air supply, the blast furnace is cut off, direct and indirect losses caused by the air supply can be large, and therefore the air distribution device is generally adopted in the production of the blast furnace so as to prevent the slag pouring accident of a blast furnace air port caused by the failure of the fan and the interruption of the air supply. At present, the air shifting valve of the conventional air shifting device adopts a full-open and full-close mode in operation and control. The air distributing device and the control mode are only suitable for the condition that the air supply pressure parameters of the two blast furnaces are the same or similar, and when the air supply pressure parameters of the two blast furnaces are greatly different, the air distributing device and the control mode have great potential safety hazards. If a fan with lower air pressure fails in the two air supply fans, the air shifting valve can rapidly rise the blast furnace air volume and pressure with lower air pressure due to the fact that a large amount of high-pressure airflow enters the two air supply fans when being opened, and the safety of the blast furnace is directly influenced; if a fan with higher air pressure breaks down, the air shifting valve is opened instantly, and the air flow in the air supply main pipe with higher air pressure enters the air supply main pipe with lower air pressure due to larger volume of the air supply pipeline, so that the air pressure of the blast furnace with lower air pressure can quickly rise, the safety of the blast furnace is influenced, and even the safety protection action of the fan with lower air pressure can be caused, and the accident is enlarged; in addition, the air volume of a fan with lower air pressure is small, the air-distributing capacity is limited, and the two blast furnaces can be dragged down due to the full opening of the air-distributing valve. Therefore, in order to avoid the above situations, when the conventional air distribution device and the control mode are used for operation, the air distribution device is generally specified to be actively withdrawn when the air pressure of a certain fan is lower than the normal production value of 0.1-0.15 MPa, during the period, the two blast furnaces lose the air distribution protection, and once the fan fails, the air supply interruption inevitably causes great influence on the production of the blast furnaces. Therefore, the devices and methods in the prior art cannot meet the requirements of safety and reliability.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the metallurgical blast furnace air distributing device is simple in structure, can automatically set and control the opening degree of the air distributing valve according to the actual air supply pressure difference value of the two air supply main pipes when one fan breaks down and moves air distribution, effectively avoids the serious safety production influence on a blast furnace and the fan due to the large pressure difference value of the two air supply main pipes when the air distribution moves, improves the safety and reliability of the air distribution process, and simultaneously enlarges the application range.
To solve the technical problems, the invention adopts the technical scheme that:
the invention relates to a metallurgical blast furnace air distribution device, which comprises a fan I and a fan II, wherein the fan I is communicated with an air supply main pipe I, a pressure sensor I is arranged on the air supply main pipe I, the fan II is communicated with an air supply main pipe II 5, a pressure sensor II is arranged on the air supply main pipe II, the air supply main pipe I is communicated with the air supply main pipe II through an air distribution pipeline, an air distribution valve is arranged on the air distribution pipeline, an isolation valve I is arranged on the air distribution pipeline between the air distribution valve and the air supply main pipe I3, an isolation valve II is arranged on the air distribution pipeline between the air distribution valve and the air supply main pipe II, and the fan I1, the fan II 2, the air distribution valve, the isolation valve I, the isolation valve II, the pressure sensor I4 and the pressure sensor II 6 are respectively connected with a control component through signal cables.
The pressure sensor I4 of the metallurgical blast furnace air distributing device is set to be of a structure capable of monitoring an actual pressure value I in an air supply main pipe I3 in real time and feeding back the actual pressure value I to the control part 11 in real time; the pressure sensor II 6 is set to be of a structure capable of monitoring an actual pressure value II in the air supply main pipe II 5 in real time and feeding back the actual pressure value II to the control part 11 in real time; and if the air supply interruption fault signals occur, the blower I and the blower II are fed back to the structure of the control part in real time.
When a fan I and a fan II of the metallurgical blast furnace air distributing device work normally, the control component is set to be a structure capable of controlling the isolation valve I and the isolation valve II to be in a fully-opened state, and the control component is set to be a structure capable of controlling the air distributing valve to be in a fully-closed state.
When one of a fan I and a fan II of the metallurgical blast furnace air distribution device breaks down and air supply is interrupted, the control component is set to be a structure capable of controlling the isolation valve I and the isolation valve II to be in a fully-opened state, and the control component is set to be a structure capable of controlling the air distribution valve to be in an opened state.
When the lower fan of wind pressure breaks down and the air feed is interrupted among fan I and fan II, for preventing to dial when the blast gate is opened and scurrying in a large number because of high pressure air current, lead to the lower blast furnace amount of wind pressure, the quick rise of wind pressure influences blast furnace safety, the control part control is dialled the blast gate and is opened corresponding aperture according to the control curve is automatic. The control curve is designed according to the pressure difference value between the actual pressure value I and the actual pressure value II of the two air supply main pipes at the moment of failure and the corresponding opening degree of the air distributing valve, and the corresponding parameters of 5 air pressure difference values (MPa) and the opening degree (%) of the air distributing valve selected by the control curve design are respectively as follows: the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 15 percent; the air pressure difference value is 0.2MPa, and the opening degree of the air distributing valve is 20 percent; the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 30 percent; the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 40 percent; when the air pressure difference value is 0MPa, the opening degree of the air distributing valve is 70 percent.
The higher fan of wind pressure breaks down and the air feed when breaking down in fan I and fan II, for preventing to dial the higher air feed female pipe of wind pressure interior high pressure air current scurries the lower air feed female pipe of wind pressure in the twinkling of an eye when the blast gate is opened, lead to the lower blast furnace amount of wind pressure, the wind pressure rises fast and influences the safety of blast furnace and fan, should wait that the pressure in the higher air feed female pipe of wind pressure drops to and is less than the lower pressure in the air feed female pipe of wind pressure after, the control part controls again and dials opening of wind valve. Because of the amount of wind of low wind pressure fan is on the small side, should dial the wind valve opening and restrict, prevent dragging two blast furnaces that collapse, dial the wind valve and open corresponding aperture according to control curve, control curve carries out the design according to the pressure difference of actual pressure numerical value I and actual pressure numerical value II of two air supply main pipes in the twinkling of an eye that breaks down, 5 wind pressure difference (MPa) and the corresponding parameter of dialling wind valve opening (%) that control curve design selection are: the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 30 percent; the air pressure difference value is 0.2MPa, and the opening of the air distributing valve is 35 percent; the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 40 percent; the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 50 percent; the air pressure difference value is 0MPa, and the opening degree of the air distributing valve is 70 percent.
The air shifting valve 8 is a pneumatic adjusting butterfly valve, 70% of the air shifting valve 8 is selected as the maximum opening degree (the throttling effect is small after the opening degree of the butterfly valve exceeds 70%), and the isolation valve I9 and the isolation valve II 10 are electric isolation valves.
The invention also relates to a control method of the metallurgical blast furnace air distribution device, which has simple steps, can automatically set and control the opening of the air distribution valve according to the actual air supply pressure difference of the two air supply main pipes when one fan fails and moves to distribute air, effectively avoids the serious safety production influence on a blast furnace and the fan caused by the overlarge pressure difference of the two air supply main pipes during the air distribution movement, improves the safety and reliability of the air distribution process, and simultaneously enlarges the application range.
The control method of the metallurgical blast furnace air distributing device comprises the following steps: 1) when a fan I and a fan II of the metallurgical blast furnace air distributing device work normally, the control component controls the isolation valve I and the isolation valve II to be in a full-open state, and the control component controls the air distributing valve to be in a full-closed state; 2) when one of the fan I and the fan II has a fault and air supply is interrupted, the control part controls the isolation valve I and the isolation valve II 10 to be in a full-open state, and controls the air distributing valve to be in an open state; 3) when the fans with lower wind pressure in the fan I and the fan II have faults and the wind supply is interrupted, in order to prevent the blast furnace wind volume and the wind pressure with low wind pressure from rapidly rising during wind stirring, the opening degree of the wind stirring valve is set according to the pressure difference value of the actual pressure value I and the actual pressure value II of the two blast furnaces at the moment of the fault; when the fans with higher wind pressure in the fan I and the fan II break down and supply wind is interrupted, in order to prevent the wind in the wind supply main pipe with higher wind pressure from instantly jumping into the wind supply main pipe with lower wind pressure when the wind shifting valve is opened, the wind volume of the blast furnace with lower wind pressure and the wind pressure rapidly rise, the safety of the blast furnace and the fans are influenced, the wind volume of the fan with lower wind pressure is relatively small, the two blast furnaces can be dragged and collapse when the wind shifting valve is fully opened, so that the wind shifting valve is allowed to be opened after the pressure in the wind supply main pipe with higher wind pressure is reduced to be lower than the pressure in the wind supply main pipe with lower wind pressure, and the opening degree is set according to the pressure difference value of the actual pressure value I and the actual pressure value II of the two blast furnaces at the moment of failure.
When the fan with lower wind pressure in the fan I and the fan II breaks down, the corresponding parameters of the wind pressure difference (MPa) and the opening (%) of the air distributing valve of the two air supply main pipes at the moment of the failure selected by the design of the opening control curve of the air distributing valve are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 15 percent;
the air pressure difference value is 0.2MPa, and the opening degree of the air distributing valve is 20 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 30 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 40 percent;
when the air pressure difference value is 0MPa, the opening degree of the air distributing valve is 70 percent.
When the fans with higher wind pressure in the fan I and the fan II break down and wind supply is interrupted, the corresponding parameters of the wind pressure difference (MPa) and the wind distributing valve opening (%) of the two wind supply main pipes at the moment of the fault selected by the design of the wind distributing valve opening control curve are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 30 percent;
the air pressure difference value is 0.2MPa, and the opening of the air distributing valve is 35 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 40 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 50 percent;
the air pressure difference value is 0MPa, and the opening degree of the air distributing valve is 70 percent.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
according to the metallurgical blast furnace air distribution device and the control method thereof, when the metallurgical blast furnace air distribution device is arranged, an air distribution pipeline is additionally arranged between the air supply main pipes of the two blast furnaces, the air distribution valve adopts a pneumatic valve, and when the air supply is interrupted due to a fan failure, the air distribution valve can be quickly opened under the control of the control part. A wind supply interruption failure of a wind turbine typically includes a trip shutdown or safe operation (i.e., load shedding) of the wind turbine. When one fan is in tripping shutdown or safe operation failure and no longer supplies air to the corresponding blast furnace, the pressure of the air supply main pipe corresponding to the fan is quickly reduced. At the moment, the air shifting device timely opens the air shifting valve according to the fan fault signal, and divides part of the air quantity of the other fan to the blast furnace supplied by the fault fan through the air shifting pipeline, so that the blast furnace is ensured not to break air and block an air port. The key technical problem that the application aims at is that when one fan breaks down, the air pressure parameters of two blast furnaces have great difference, and then the problem exists: after the pneumatic valve is opened, the two blast furnace main pipes are communicated, and the wind in the main pipe with higher wind pressure can naturally flow to the main pipe with lower wind pressure. According to the technical scheme, the air shifting valve adopts the pneumatic adjusting valve, when the lower fans of wind pressure in the fan I and the fan II break down and wind supply is interrupted, the blast furnace air quantity and the wind pressure of the low wind pressure quickly rise to influence the safety of the blast furnace when wind is shifted, and the control component controls the air shifting valve to open to the corresponding opening according to the pressure difference value of two wind supply main pipes in the moment of failure. When the fans with higher wind pressure in the fan I and the fan II have faults and wind supply is interrupted, in order to prevent the wind in the wind supply main pipe with higher wind pressure from instantly jumping into the wind supply main pipe with lower wind pressure when the wind shifting valve is opened, the wind volume of the blast furnace with lower wind pressure and the rapid rise of the wind pressure are caused to influence the safety of the blast furnace and the fans, the two blast furnaces can be dragged due to the fact that the wind volume of the fan with lower wind pressure is relatively small when the wind shifting valve is fully opened, so that after the pressure in the wind supply main pipe with higher wind pressure is reduced to be lower than the pressure in the wind supply main pipe with lower wind pressure, the control part controls the wind shifting valve to be opened to the corresponding opening degree according to the pressure difference value in the two wind supply main pipes at the moment of the. Therefore, the key point of the application is that the problem of air distribution when the pressure difference value of the two air supply main pipes is large is solved by controlling the opening degree of the air distribution valve. The metallurgical blast furnace air distribution device and the control method thereof can automatically set and control the opening of the air distribution valve according to the actual air supply pressure difference of the two air supply main pipes when one fan fails and moves, effectively avoid the serious safety production influence on the blast furnace and the fan due to the large pressure difference of the two air supply main pipes during the air distribution movement, improve the safety and reliability of the air distribution process, and simultaneously expand the application range.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic structural view of a metallurgical blast furnace air distributing device according to the invention;
FIG. 2 is a schematic view of corresponding control curves of the air pressure difference (MPa) of two air supply main pipes and the opening (%) of an air distributing valve of the metallurgical blast furnace air distributing device of the invention;
FIG. 3 is a table of corresponding parameters of the air pressure difference (MPa) and the opening (%) of the air distributing valve of two air supply main pipes selected by the design of the opening control curve of the air distributing valve when the fan with lower air pressure in the fan I and the fan II fails;
FIG. 4 is a table of corresponding parameters of the air pressure difference (MPa) and the opening (%) of the air distributing valve of two air supply main pipes selected by the design of the control curve of the opening of the air distributing valve when the fan with higher air pressure in the fan I and the fan II fails;
in the drawings, the reference numbers are respectively: 1. a fan I; 2. a fan II; 3. an air supply main pipe I; 4. a pressure sensor I; 5. a main air supply pipe II; 6. a pressure sensor II; 7. a wind distributing pipeline; 8. a wind poking valve; 9. an isolation valve I; 10. an isolation valve II; 11. a control component; 12. and a blast valve.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:
as shown in the attached drawing 1, the invention relates to a metallurgical blast furnace air distribution device, which comprises a fan I1 and a fan II 2, wherein the fan I1 is communicated with an air supply main pipe I3, the air supply main pipe I3 is provided with a pressure sensor I4, the fan II 2 is communicated with an air supply main pipe II 5, the air supply main pipe II 5 is provided with a pressure sensor II 6, the air supply main pipe I3 is communicated with the air supply main pipe II 5 through an air distribution pipeline 7, the air distribution pipeline 7 is provided with an air distribution valve 8, the air distribution pipeline 7 between the air distribution valve 8 and the air supply main pipe I3 is provided with an isolation valve I9, the air distribution pipeline 7 between the air distribution valve 8 and the air supply main pipe II 5 is provided with an isolation valve II 10, and the fan I1, the fan II 2, the air distribution valve 8, the isolation valve I9, the isolation valve II 10, the pressure sensor I4 and the pressure sensor II 6 are respectively connected with a control part 11 through signal cables. Above-mentioned structure when setting up metallurgical blast furnace and dialling the wind device, adds one between the main pipe of air feed of two blast furnaces and dials the wind pipeline, dials the wind valve and adopts the pneumatic valve, dials the wind valve and can open under the control part control fast when the fan takes place the air feed and breaks down. A wind supply interruption failure of a wind turbine typically includes a trip shutdown or safe operation (i.e., load shedding) of the wind turbine. When one fan is in tripping shutdown or safe operation failure and does not supply air to the corresponding blast furnace any more, the pressure of the air supply main pipe corresponding to the fan is quickly reduced. At the moment, the air distributing device timely opens the air distributing valve according to the fault signal, and distributes a part of air of the other fan to the blast furnace supplied by the fault fan through the air distributing pipeline, so that the blast furnace is ensured not to break air and block an air port. The key technical problem that the application aims at is that when one fan breaks down, the air pressure parameters of two blast furnaces have great difference, and then the problem exists: after the pneumatic valve is opened, the two blast furnace main pipes are communicated, and the wind in the main pipe with higher wind pressure can naturally flow to the main pipe with lower wind pressure. The technical scheme of this application dials blast gate 8 and adopts pneumatic control valve, and when the lower fan of wind pressure broke down and the air feed was interrupted in fan I1 and fan II 2, for blast furnace amount of wind, the wind pressure of low wind pressure rises fast when preventing to dial wind, influences blast furnace safety, and control unit 11 controls according to the pressure difference value of two air feed female pipes in the twinkling of an eye of trouble and dials blast gate 8 and opens corresponding aperture. When the fans with higher wind pressure in the fan i 1 and the fan ii 2 have faults and the wind supply is interrupted, in order to prevent the wind in the wind supply main pipe with higher wind pressure from instantly flowing into the wind supply main pipe with lower wind pressure when the wind shifting valve 8 is opened, which causes the wind volume and the wind pressure of the blast furnace with lower wind pressure to rapidly rise, and affects the safety of the blast furnace and the fans, the wind volume of the fan with lower wind pressure is relatively small, the wind shifting valve 8 is fully opened, which may cause the two blast furnaces to be dragged down, so that the control component 11 controls the wind shifting valve 8 to be opened to a corresponding opening degree according to the pressure difference value in the two wind supply main pipes at the moment of the fault after the pressure in the wind supply main pipe with higher wind pressure is reduced to be lower than the pressure in the wind supply main pipe with lower wind. Therefore, the key point of the application is that the problem of air distribution when the pressure difference value of the two air supply main pipes is large is solved by controlling the opening degree of the air distribution valve 8. The metallurgical blast furnace air distributing device and the control method thereof have the advantages of simple structure, convenient operation, high safety and wide application range, and can automatically set and control the opening of the air distributing valve 8 according to the actual air supply pressure difference of the two air supply main pipes at the moment of failure when one fan fails and moves air, thereby effectively avoiding the serious safety production influence on the blast furnace and the fan caused by the large pressure difference of the two air supply main pipes during the air distributing motion and improving the safety and reliability of the air distributing process.
The pressure sensor I4 of the metallurgical blast furnace air distributing device is set to be of a structure capable of monitoring an actual pressure value I in an air supply main pipe I3 in real time and feeding back the actual pressure value I to the control part 11 in real time; the pressure sensor II 6 is set to be of a structure capable of monitoring an actual pressure value II in the air supply main pipe II 5 in real time and feeding back the actual pressure value II to the control part 11 in real time; if the air supply interruption fault signals occur, the blower I1 and the blower II 2 feed back to the control part 11 in real time. By means of the structure, corresponding pressure parameters and fan fault signals can be obtained in real time through the pressure sensor, and the control component 11 can conveniently make corresponding judgment and control.
When one of a fan I1 and a fan II 2 of the metallurgical blast furnace air distributing device breaks down and air supply is interrupted, the control part 11 is set to be a structure capable of controlling the isolation valve I9 and the isolation valve II 10 to be in a full-open state, and the control part 11 is set to be a structure capable of controlling the air distributing valve 8 to be in an open state. With the structure, when one fan is tripped and stopped or has a safe operation fault and does not supply air to the blast furnace any more, the pressure of the air supply main pipe which stops supplying air due to the fault can be quickly reduced. At this time, the control unit 11 receives the fan failure signal, and at this time, it is determined that the corresponding fan has a failure. Then, the control part 11 opens the air shifting valve 8 in time according to the fan fault signal, and the air shifting valve 8 is opened to a corresponding opening degree according to the air pressure difference value of the two air supply main pipes at the moment of the fault. Therefore, the problem of air distribution when the pressure difference value of the two main pipes is too large is effectively solved.
Fan I1 and fan II 2 during the lower fan of wind pressure breaks down and the air feed is interrupted, scurry into because of the high pressure air current when opening for preventing to dial blast gate 8, lead to the blast furnace amount of wind of low wind pressure, the wind pressure rises fast and influences blast furnace safety, the opening aperture of blast gate 8 is dialled in the control of control part 11 control, dial 8 apertures of blast gate and set for according to the pressure difference value of the actual pressure numerical value I and the actual pressure numerical value II of two air feed main pipes in the twinkling of an eye of trouble, the corresponding parameter of wind pressure difference value (MPa) and dial wind gate opening (%) is respectively: the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 15 percent; the air pressure difference value is 0.2MPa, and the opening degree of the air distributing valve is 20 percent; the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 30 percent; the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 40 percent; when the air pressure difference value is 0MPa, the opening degree of the air distributing valve is 70 percent.
The higher fan of wind pressure breaks down and the air feed when interrupting in fan I1 and fan II 2, for prevent to dial the higher air feed main pipe of wind pressure when the blast gate 8 is opened the lower air feed main pipe of wind pressure is scurried into in the twinkling of an eye to the higher air feed main pipe of wind pressure, lead to the blast furnace amount of wind of low wind pressure, the safety of wind pressure quick rise influence blast furnace and fan, should wait that the pressure in the higher air feed main pipe of wind pressure drops to and is less than the lower pressure in the air feed main pipe of wind pressure after, the opening of wind valve 8 is dialled in the control part 11 uncontrolled again. Also because of the lower air quantity of fan of wind pressure is relatively few, should dial 8 apertures of blast valve and restrict, prevent dragging two blast furnaces that collapse, dial 8 apertures of blast valve and carry out corresponding settlement according to the pressure difference of actual pressure numerical value I and actual pressure numerical value II of two air supply main pipes in the twinkling of an eye that breaks down, wind pressure difference (MPa) and dial corresponding parameter of blast valve aperture (%) are respectively: the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 30 percent; the air pressure difference value is 0.2MPa, and the opening of the air distributing valve is 35 percent; the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 40 percent; the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 50 percent; the air pressure difference value is 0MPa, and the opening degree of the air distributing valve is 70 percent.
The air shifting valve 8 is a pneumatic adjusting butterfly valve, 70% of the air shifting valve 8 is selected as the maximum opening degree (the throttling effect is small after the opening degree of the butterfly valve exceeds 70%), and the isolation valve I9 and the isolation valve II 10 are electric isolation valves. In the structure, the air distributing valve 8 adopts a pneumatic regulating valve and can be quickly opened to a set opening degree when one fan breaks down. The isolation valve is an electric isolation valve and is kept normally open in a normal state, and the isolation valve is operated to be closed when the wind is required to be split and quit after the wind distributing action and the standby unit are started to supply wind; when the air distributing valve 8 is overhauled, the air distributing valve 8 is isolated from the air supply main pipes on the two sides by closing the isolation valves on the two sides.
The invention also relates to a control method of the metallurgical blast furnace air distribution device, which has simple steps, can automatically set and control the opening degree of the air distribution valve 8 according to the actual air supply pressure difference of the two air supply main pipes at the moment of failure when one fan fails and moves air distribution, effectively avoids the serious safety production influence on a blast furnace and the fan due to the large pressure difference of the two air supply main pipes during the air distribution movement, improves the safety and reliability of the air distribution process, and simultaneously enlarges the application range.
The control method of the metallurgical blast furnace air distributing device comprises the following steps: 1) when a fan I1 and a fan II 2 of the metallurgical blast furnace air distributing device work normally, a control part 11 controls an isolation valve I9 and an isolation valve II 10 to be in a full-open state, and the control part 11 controls an air distributing valve 8 to be in a full-closed state; 2) when one of the fans I1 and II 2 has a fault and air supply is interrupted, the control part 11 controls the isolation valve I9 and the isolation valve II 10 to be in a full-open state, and the control part 11 controls the air stirring valve 8 to be in an open state; 3) when the lower fan of wind pressure breaks down and the air feed is interrupted among fan I1 and fan II 2, for blast furnace amount of wind, the wind pressure that prevents to dial low wind pressure when wind rises fast, dials 8 apertures of wind valve and corresponds the settlement according to the actual pressure numerical value I and the pressure difference value of actual pressure numerical value II of two air feed main pipes in the twinkling of an eye of trouble. When the air supply is interrupted due to the failure of the fans with higher air pressure in the fan I1 and the fan II 2, in order to prevent the high-pressure air flow in the air supply main pipe with higher air pressure from instantly flowing into the air supply main pipe with lower air pressure when the air shifting valve 8 is opened, which causes the rapid rise of the blast furnace air volume and the air pressure with low air pressure to influence the safety of the blast furnace and the fans, the air shifting valve 8 is allowed to be opened after the pressure in the air supply main pipe with higher air pressure is reduced to be lower than the pressure in the air supply main pipe with lower air pressure. Because the air quantity of the fan with lower air pressure is relatively small, the two blast furnaces can be dragged down by the full opening of the air distributing valve 8, so the opening degree of the air distributing valve 8 is limited, and the opening degree is correspondingly set according to the pressure difference value of the actual pressure value I and the actual pressure value II of the two air supply main pipes at the moment of failure.
When the fans with lower wind pressure in the fan I1 and the fan II 2 have faults, corresponding parameters of a wind pressure difference value (MPa) of two wind supply main pipes and 8 opening (%) of the wind distributing valve at the moment of the faults are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 15 percent;
the air pressure difference value is 0.2MPa, and the opening degree of the air distributing valve is 20 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 30 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 40 percent;
when the air pressure difference value is 0MPa, the opening degree of the air distributing valve is 70 percent.
When the fans with higher wind pressure in the fan I1 and the fan II 2 are in failure and wind supply is interrupted, the corresponding parameters of the wind pressure difference (MPa) and the opening (%) of the air distributing valve 8 of the two wind supply main pipes at the moment of failure are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 30 percent;
the air pressure difference value is 0.2MPa, and the opening of the air distributing valve is 35 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 40 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 50 percent;
the air pressure difference value is 0MPa, and the opening degree of the air distributing valve is 70 percent.
In the present invention, fig. 2 is a schematic diagram showing the corresponding control curves of the air pressure difference value (MPa) and the opening (%) of the air distributing valve of the metallurgical blast furnace air distributing device according to the present invention. No matter the fan with lower wind pressure or the fan with higher wind pressure breaks down and air supply is interrupted, the control part can reliably control the air distributing valve to be opened to the corresponding opening degree. In the two cases, corresponding points between 5 air pressure difference values and the opening degree of the air distributing valve are respectively set, and the air pressure difference values and the opening degree of the air distributing valve are in one-to-one correspondence by converting the air pressure difference values into two control curves through a program.
When the metallurgical blast furnace air distribution device is arranged, an air distribution pipeline is additionally arranged between air supply main pipes of two blast furnaces, an air distribution valve adopts a pneumatic valve, and the air distribution valve can be quickly opened to a corresponding opening under the control of a control part when the air supply is interrupted due to a fan failure. A wind supply interruption failure of a wind turbine typically includes a trip shutdown or safe operation (i.e., load shedding) of the wind turbine. When one fan is in tripping shutdown or safe operation failure and no longer supplies air to the blast furnace, the pressure of the corresponding air supply main pipe of the blast furnace is rapidly reduced. At the moment, the air shifting device timely opens the air shifting valve according to the fault signal, and divides part of the air quantity of the other fan to the blast furnace supplied by the fault fan through the air shifting pipe, so that the blast furnace is ensured not to break air and block an air port. The technical problem that the application was directed to is, when a fan broke down, the wind pressure of two air feed main pipes differed great just have the problem: after the pneumatic valve is opened, the two blast furnace main pipes are communicated, and the wind in the main pipe with higher wind pressure can naturally flow to the main pipe with lower wind pressure. According to the technical scheme, the air shifting valve adopts the pneumatic adjusting valve, when the lower fans of wind pressure in the fan I and the fan II break down and wind supply is interrupted, the blast furnace air quantity and the wind pressure of low wind pressure quickly rise when wind is prevented from being shifted, and the control component controls the air shifting valve to be opened to the corresponding opening according to the pressure difference value of two wind supply main pipes in the moment of the fault. When the fans with higher wind pressure in the fan I and the fan II have faults and wind supply is interrupted, in order to prevent the wind in the wind supply main pipe with higher wind pressure from instantly jumping into the wind supply main pipe with lower wind pressure when the wind shifting valve is opened, the wind volume and the wind pressure of the blast furnace with lower wind pressure are rapidly increased, the safety of the blast furnace and the fans is influenced, the wind volume of the fan with lower wind pressure is relatively small, the two blast furnaces can be dragged by the full opening of the wind shifting valve, so after the pressure in the wind supply main pipe with higher wind pressure is reduced to be lower than the pressure in the wind supply main pipe with lower wind pressure, the control part controls the wind shifting valve to be opened to the corresponding opening according to the pressure difference value in the two wind supply main pipes at the moment of the fault. Therefore, the key point of the application is that the problem of air distribution when the pressure difference value of the two air supply main pipes is large is solved by controlling the opening degree of the air distribution valve. The metallurgical blast furnace air distributing device and the control method thereof have the advantages of simple structure, convenient operation, good safety and wide applicability, and can automatically set and control the opening of the air distributing valve according to the actual air supply pressure difference of the two air supply main pipes at the moment of failure when one fan fails and moves air, thereby effectively avoiding the serious safety production influence on the blast furnace and the fan caused by the large pressure difference of the two air supply main pipes during the air distributing motion and improving the safety and reliability of the air distributing process.
The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a metallurgical blast furnace device of dialling wind which characterized in that: including fan I (1) and fan II (2), fan I (1) and main pipe I (3) intercommunication of air feed, set up pressure sensor I (4) on main pipe I (3) of air feed, fan II (2) and main pipe II (5) intercommunication of air feed, set up pressure sensor II (6) on main pipe II (5) of air feed, main pipe I (3) and main pipe II (5) of air feed are through dialling wind pipeline (7) intercommunication, dial on wind pipeline (7) and set up and dial wind valve (8), dial and set up isolation valve I (9) on dialling wind pipeline (7) between wind valve (8) and the main pipe I (3) of air feed, dial on wind pipeline (7) between wind valve (8) and the main pipe II (5) of air feed and set up isolation valve II (10), fan I (1), fan II (2), wind dials valve (8), isolation valve (9), isolation valve II (10), pressure sensor I (4), The pressure sensors II (6) are respectively connected with the control part (11) through signal cables.
2. The metallurgical blast furnace air distributing device of claim 1, wherein: the pressure sensor I (4) of the metallurgical blast furnace air distributing device is set to be of a structure capable of monitoring an actual pressure value I in an air supply main pipe I (3) in real time and feeding back the actual pressure value I to the control part (11) in real time; the pressure sensor II (6) is set to be of a structure capable of monitoring an actual pressure value II in the air supply main pipe II (5) in real time and feeding back the actual pressure value II to the control part (11) in real time; if the air supply interruption fault signals occur, the blower I (1) and the blower II (2) feed back to the structure of the control part (11) in real time.
3. The metallurgical blast furnace air distributing device of claim 2, characterized in that: when a fan I (1) and a fan II (2) of the metallurgical blast furnace air distributing device normally work, a control component (11) is set to be a structure capable of controlling an isolation valve I (9) and an isolation valve II (10) to be in a full-open state, and the control component (11) is set to be a structure capable of controlling an air distributing valve (8) to be in a full-close state.
4. The metallurgical blast furnace air distributing device of claim 2, characterized in that: when one of a fan I (1) and a fan II (2) of the metallurgical blast furnace air distributing device breaks down and air supply is interrupted, the control component (11) is set to be a structure capable of controlling the isolation valve I (9) and the isolation valve II (10) to be in a fully open state, and the control component (11) is set to be a structure capable of controlling the air distributing valve (8) to be in an open state.
5. The metallurgical blast furnace ventilation device of claim 4, wherein: the lower fan of wind pressure breaks down and when the air feed was interrupted in fan I (1) and fan II (2), for preventing to dial when blast gate (8) is opened and scurrying into in a large number because of high pressure air current, lead to the lower blast furnace amount of wind pressure, the wind pressure rises fast and influences blast furnace safety, control part (11) receive behind the fan fault signal control dial blast gate (8) and open corresponding aperture according to the control curve is automatic. The control curve is designed according to the pressure difference value between the actual pressure value I and the actual pressure value II of the two air supply main pipes at the moment of failure and the corresponding opening degree of the air distributing valve (8), and the corresponding parameters of 5 air pressure difference values (MPa) and the opening degree (%) of the air distributing valve selected by the control curve design are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 15 percent;
the air pressure difference value is 0.2MPa, and the opening degree of the air distributing valve is 20 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 30 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 40 percent;
when the air pressure difference value is 0MPa, the opening degree of the air distributing valve is 70 percent.
6. The metallurgical blast furnace ventilation device of claim 4, wherein: fan I (1) and fan II (2) during the higher fan of wind pressure breaks down and the air feed is interrupted, the higher air feed main pipe of wind pressure is scurried in the twinkling of an eye into the lower air feed main pipe of wind pressure for preventing when dialling blast gate (8) and opening, lead to the lower blast furnace amount of wind pressure, the wind pressure rises fast and influences the safety of blast furnace and fan, control unit (11) receive behind the fan fault signal should wait that the pressure in the higher air feed main pipe of wind pressure drops to the pressure that is less than in the lower air feed main pipe of wind pressure, the opening of wind valve (8) is dialled in the re-control. Because of the lower amount of wind of fan of wind pressure is less relatively, also should dial blast gate (8) aperture and restrict, prevent to drag two blast furnaces that collapse, dial blast gate (8) and open corresponding aperture according to control curve, control curve carries out the design according to the actual pressure numerical value I of two air supply main pipes in the twinkling of an eye of trouble and the pressure differential value of actual pressure numerical value II, 5 wind pressure differential values (MPa) and the corresponding parameter of dialling blast gate aperture (%) of control curve design selection are respectively:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 30 percent;
the air pressure difference value is 0.2MPa, and the opening of the air distributing valve is 35 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 40 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 50 percent;
the air pressure difference value is 0MPa, and the opening degree of the air distributing valve is 70 percent.
7. The metallurgical blast furnace draught device according to claim 1 or 2, wherein: the air shifting valve (8) is a pneumatic adjusting butterfly valve, 70% of the air shifting valve (8) is selected as the maximum opening degree (the throttling effect is small after the opening degree of the butterfly valve exceeds 70%), and the isolating valve I (9) and the isolating valve II (10) are electric isolating valves.
8. A control method of a metallurgical blast furnace air distributing device is characterized by comprising the following steps: the control method of the metallurgical blast furnace air distributing device comprises the following steps: 1) when a fan I (1) and a fan II (2) of the metallurgical blast furnace air distributing device work normally, a control component (11) controls an isolation valve I (9) and an isolation valve II (10) to be in a fully open state, and the control component (11) controls an air distributing valve (8) to be in a fully closed state; 2) when one of the first fan (1) and the second fan (2) has a fault and air supply is interrupted, the control component (11) controls the isolation valve I (9) and the isolation valve II (10) to be in a fully open state, and the control component (11) controls the air shifting valve (8) to be in an open state; 3) when the fans with lower wind pressure in the fan I (1) and the fan II (2) break down and wind supply is interrupted, in order to prevent the blast furnace air quantity and the wind pressure with low wind pressure from rapidly rising to influence the blast furnace safety when wind is distributed, the opening degree of the wind distributing valve (8) is set according to the pressure difference value of the actual pressure value I and the actual pressure value II of the two wind supply main pipes at the moment of the fault; when the fans with higher wind pressure in the fan I (1) and the fan II (2) break down and wind supply is interrupted, in order to prevent high-pressure airflow in the wind supply main pipe with higher wind pressure from instantly jumping into the wind supply main pipe with lower wind pressure when the wind shifting valve (8) is opened, the blast furnace air quantity with lower wind pressure is caused, the wind pressure rapidly rises to influence the safety of the blast furnace and the fans, the wind shifting valve (8) is allowed to be opened only after the pressure in the wind supply main pipe with higher wind pressure is reduced to be lower than the pressure in the wind supply main pipe with lower wind pressure, the full opening of the wind shifting valve (8) can possibly drag two blast furnaces due to the relatively small wind quantity of the fan with lower wind pressure, so the limitation on the opening degree of the wind shifting valve is also required, and the opening degree of the wind shifting valve (8) is set according to the pressure difference value of the actual pressure value I and the actual pressure value II of the two wind supply main pipes.
9. The control method of the metallurgical blast furnace air distributing device according to claim 8, characterized in that: when the fans with lower wind pressure in the fan I (1) and the fan II (2) break down, the corresponding parameters of the wind pressure difference value (MPa) and the wind distributing valve opening (%) of the two wind supply main pipes at the moment of the failure selected by the design of the wind distributing valve opening control curve are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 15 percent;
the air pressure difference value is 0.2MPa, and the opening degree of the air distributing valve is 20 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 30 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 40 percent;
when the air pressure difference value is 0MPa, the opening degree of the air distributing valve is 70 percent.
10. The control method of the metallurgical blast furnace air distributing device according to claim 8, characterized in that: when the fans with higher wind pressure in the fan I (1) and the fan II (2) break down and wind supply is interrupted, the corresponding parameters of the wind pressure difference value (MPa) and the wind distributing valve opening (%) of the two wind supply main pipes at the moment of the failure selected by the design of the wind distributing valve opening control curve are respectively as follows:
the air pressure difference value is more than 0.25MPa, and the opening of the air distributing valve is 30 percent;
the air pressure difference value is 0.2MPa, and the opening of the air distributing valve is 35 percent;
the air pressure difference value is 0.15MPa, and the opening degree of the air distributing valve is 40 percent;
the air pressure difference value is 0.1MPa, and the opening degree of the air distributing valve is 50 percent;
the air pressure difference value is 0MPa, and the opening degree of the air distributing valve is 70 percent.
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