CN114752721A - Single-seat blast furnace fan power-saving system and control method thereof - Google Patents
Single-seat blast furnace fan power-saving system and control method thereof Download PDFInfo
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- CN114752721A CN114752721A CN202210286408.4A CN202210286408A CN114752721A CN 114752721 A CN114752721 A CN 114752721A CN 202210286408 A CN202210286408 A CN 202210286408A CN 114752721 A CN114752721 A CN 114752721A
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- C—CHEMISTRY; METALLURGY
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- C21B7/16—Tuyéres
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention discloses a single-seat blast furnace blower power-saving system and a control method thereof, belonging to the technical field of metallurgical blast furnace blowing. According to the supply protection system, a main air supply fan is communicated with a main air supply pipeline, and a first check valve, a first air outlet valve and a first air supply valve are sequentially arranged on the main air supply pipeline; accompany the air supply machine and accompany the air supply pipeline and be linked together, accompany and set gradually second check valve, second air outlet valve, second air supply valve on the air supply pipeline, main air supply pipeline is linked together with accompany the air supply pipeline through complementing the air supply pipeline, main air supply machine normally works, the second check valve is in reverse isolated state, main air supply machine breaks down, first check valve is forced to close, accompany the controlled automatic loading of air supply machine, increase its exhaust pressure, make the second check valve turn into forward switch-on from keeping apart automatically, guarantee the blast furnace normal operating. In the invention, the second check valve is communicated with the air supply pipeline according to the change of the front-back pressure difference value, and the accompanying air supply machine can automatically load to supply air for the blast furnace, so that the air supply machine is timely, safe and reliable, and can quickly recover the production of the blast furnace.
Description
Technical Field
The invention belongs to the technical field of metallurgical blast furnace blast, and particularly relates to a single-seat blast furnace fan power-saving system and a control method thereof.
Background
The blast furnace production characteristic has decided that fan and blast furnace are the air feed mode of one-to-one basically, in case the fan breaks down and stops the air feed, can cause the blast furnace to break down the wind, the sediment accident is irritated to the wind gap, and direct, indirect loss can be very big, so in the production overall arrangement more than there are two blast furnaces, the automatic mode of dialling wind of generally adopting avoids the blast furnace accident of breaking down the wind that leads to because of the fan trouble. However, there are cases where a single blast furnace is produced, and there is a great risk in producing a single blast furnace. Therefore, when a single blast furnace is produced, different fan supply protection methods are adopted by various enterprises, and two methods are generally summarized. The first is a supply method, that is, one fan supplies air, the other fan discharges air to operate, the higher exhaust pressure is kept, and when the air supply fan fails, an air valve of the air discharge fan is manually opened immediately to supply air to the blast furnace. The second is a mixed air mode, that is, two fans supply air to the blast furnace at the same time, and when one fan fails, the air supply amount of the other fan ensures that the blast furnace is not interrupted. The two modes can generate larger energy loss, the response speed of the accompanying mode depends on the timely reaction of operators, the air supply rate also depends on the air exhaust pressure of the air exhauster, and the safety is lower; the air mixing mode has high security, but the energy loss is doubled, the two fans supply air simultaneously, the operation is troublesome, the air quantity fluctuation is caused by mutual interference, the stable production of the blast furnace is influenced, and the air mixing mode is not suitable for long-time air supply.
Through retrieval, the application with the Chinese patent application number of 202011077421.6 discloses a metallurgical blast furnace air distribution device and a control method thereof, the air distribution device of the application, a fan I of the metallurgical blast furnace air distribution device is communicated with an air supply main pipe I, a pressure sensor I is arranged on the air supply main pipe I, a fan II is communicated with the air supply main pipe II, 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, and an air distribution valve is arranged on the air distribution pipeline, the metallurgical blast furnace air distribution device and the control method thereof of the application can solve the problem of the safety and reliability of the metallurgical blast furnace air distribution process under the condition that one fan has failure air supply interruption and the pressure parameter difference of the two air supply main pipes is large in an air distribution system of a plurality of fans, but the problem of how to timely and safely supply air when the main air supply fan has failure during the production of a single-seat blast furnace fan, it is not mentioned.
For another example, the application with chinese patent application No. 201210306057.5 discloses a slag-filling-proof device for blast furnace tuyere, which adopts two high-pressure gas tanks, and the high-pressure gas tank is charged by a high-pressure standby gas-charging source, and when the power failure of the whole plant occurs, the communicating valve is opened by program control to supply gas to the blast furnace for a short time, so as to avoid slag filling from the blast furnace tuyere, and can be used for one or more blast furnaces. The slag filling prevention device of the application needs manual active starting, and is additionally provided with the gas storage tank, so that the operation is inconvenient, and the safety is low.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of high energy consumption and low safety of the existing single blast furnace air supply and production guarantee mode, the invention provides a single-seat blast furnace blower supply guarantee system and a control method thereof. Meanwhile, when the main air supply fan works normally, the auxiliary air supply fan runs at the lowest negative pressure, the contradiction between safety and economy in air supply maintenance during production of a single blast furnace is effectively solved, and the operation is simplified.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention discloses a single-seat blast furnace blower protection and supply system, which comprises a main blower and an auxiliary blower, wherein the main blower is communicated with a main air supply pipeline, and the main air supply pipeline is sequentially provided with a first check valve, a first air outlet valve and a first air supply valve; the auxiliary air supply fan is communicated with the auxiliary air supply pipeline, a second check valve, a second air outlet valve and a second air supply valve are sequentially arranged on the auxiliary air supply pipeline, the main air supply pipeline is communicated with the auxiliary air supply pipeline through an air supply pipeline, and when the main air supply fan works normally, the second check valve reversely isolates the air supply pipeline from the auxiliary air supply pipeline; when the main air supply fan breaks down, the auxiliary air supply fan loads, the front-back pressure difference value of the second check valve changes, the second check valve automatically changes from reverse isolation to forward connection, and air is supplied to the blast furnace.
Preferably, the main air supply machine is electrically connected with a main air supply machine control unit, the auxiliary air supply machine is electrically connected with an auxiliary air supply machine control unit, the main air supply machine control unit is electrically connected with the auxiliary air supply machine control unit, an air supply interruption fault signal of the main air supply machine is fed back to the main air supply machine control unit in real time, the auxiliary air supply machine control unit obtains a feedback signal of the main air supply machine control unit, and the auxiliary air supply machine is instructed to be automatically loaded, so that the exhaust pressure of the auxiliary air supply machine is improved, and the normal operation of the blast furnace is ensured.
Preferably, a first exhaust pressure measuring point is arranged between the main air supply fan and the first check valve, a first air supply pressure measuring point is arranged between the first air outlet valve and the first air supply valve, a second exhaust pressure measuring point is arranged between the auxiliary air supply fan and the second check valve, and a second air supply pressure measuring point is arranged between the second air outlet valve and the second air supply valve.
Preferably, the pressure values of the first exhaust pressure measuring point and the first air supply pressure measuring point are fed back to the main air supply machine control unit in real time, and the pressure values of the second exhaust pressure measuring point and the second air supply pressure measuring point are fed back to the auxiliary air supply machine control unit in real time.
The invention relates to a control method of a single-seat blast furnace fan protection supply system, which utilizes the protection supply system to supply air and comprises the following steps,
S1, setting a main supply program in the main air supply fan control unit, and sending a fault signal and air supply pressure during fault to the auxiliary air supply fan when the main air supply fan fails and air supply is interrupted after selection is put into use;
s2, an auxiliary supply program is set in an auxiliary supply fan control unit, and after the auxiliary supply fan control unit is selected to be put into operation, a fault signal of the main supply fan is received for automatic loading, so that the air volume and the air pressure are improved;
s3, when a single-seat blast furnace is produced, the main air supply fan is put into a main supply program, the auxiliary air supply fan keeps the lowest load operation, and the auxiliary supply program is put into operation;
s4, the main air supply fan is in failure, the first check valve is forcibly closed, the auxiliary air supply fan automatically loads air supply, the auxiliary air supply fan exits the auxiliary air supply program after supplying air to the blast furnace, and the second air outlet valve is fully opened to form the main air supply fan;
and S5, resetting the main supply fan and the auxiliary supply fan after the standby fan is started.
Preferably, the air supply pressure of the normal work of the main air supply fan is higher than the exhaust pressure of the auxiliary air supply fan by more than 50kPa, when the blast furnace is greatly reduced to a pressure difference value smaller than 50kPa, a second air outlet valve of the auxiliary air supply fan is closed, and the auxiliary air supply mode is exited.
Preferably, when the pressure value of the second exhaust pressure measuring point rises to the pressure value of the first air supply pressure measuring point in the fault, the loading of the air supply fan is stopped.
Preferably, when the main air supply fan fails, the auxiliary air supply fan opens a large static blade angle, closes a small air release valve and finishes loading within T1 time, wherein T1 is less than or equal to 30S.
Preferably, when the auxiliary fan receives a fault signal, the large stator blade angle is opened first, and the closing operation of the air release valve lags the opening operation of the stator blade angle.
Preferably, when the main air supply fan works normally, the second air supply valve on the air supply pipeline is opened fully, and the second air outlet valve is opened by 25% -30%.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the single-seat blast furnace blower protection and supply system, when a main blower works normally, an auxiliary blower runs under the lowest load, the exhaust pressure is far lower than the pressure of the main blower, the second check valve is in a reverse isolation state, the main blower breaks down, the first check valve is forcibly closed, the auxiliary blower automatically loads, the exhaust pressure rises, the pressure of a main blower air supply pipe network continuously drops to be lower than the exhaust pressure of the auxiliary blower, the pressure difference between the front and the rear of the second check valve changes, the reverse isolation is automatically changed into a forward connection state, the blast furnace is supplied with air, and the blast furnace air break accident caused by the blower fault is avoided; the low-load operation of the auxiliary air supply fan can reduce energy consumption, the automatic loading of the auxiliary air supply fan and the automatic isolation and opening of the second check valve ensure the safety of the blast furnace system;
(2) According to the single-seat blast furnace blower protection and supply system, the main blower is in failure, when the air supply is interrupted, a failure signal and the air supply pressure during the failure are fed back to the main blower control unit in real time, the auxiliary blower control unit obtains the feedback signal of the main blower control unit, the auxiliary blower automatically loads, sufficient air supply amount is provided, the normal operation of a blast furnace is further ensured, and the safety is improved;
(3) according to the single-seat blast furnace blower protection and supply system, when the main blower is in normal operation, the air supply valve of the auxiliary blower is fully opened, the air outlet valve is opened by 25-30%, the safety requirement of the blast furnace is guaranteed while the energy consumption is reduced, the valve is convenient to close, the auxiliary blower is withdrawn, when the blast furnace is greatly reduced until the pressure difference is smaller than 50kPa, the air outlet valve of the auxiliary blower is closed, the auxiliary blower is withdrawn, and the air supply pressure can be effectively prevented from continuously descending to cause the automatic forward connection of the check valve of the auxiliary blower;
(4) according to the single-seat blast furnace fan protection and supply system, when the main fan supply fails, the auxiliary fan supply opens the large static blade angle and closes the small air release valve, and loading is completed within 30s, so that the blast furnace is ensured not to be cut off, and the safety of the system is improved. Meanwhile, the closing operation of the air release valve is started after the opening operation of the angle of the static blade is delayed, so that the working point of the fan can be kept in a stable working area.
Drawings
FIG. 1 is a schematic structural diagram of a single-seat blast furnace blower protection system according to the present invention;
FIG. 2 is a schematic diagram of a control method of a single-seat blast furnace blower protection system according to the present invention;
FIG. 3 is a graph showing the angle of opening of the stationary vane and the opening of the air release valve;
fig. 4 is a graph showing a descending curve of the air pressure of the main air feeder after a failure and an ascending curve of the air pressure of the auxiliary air feeder.
In the figure: 1. a main air supply fan; 2. a fan is accompanied and supplied; 3. a first check valve; 4. a second check valve; 5. a first air outlet valve; 6. a second air outlet valve; 7. a first blast valve; 8. a second blast valve; 9. a first exhaust pressure measuring point; 10. a second exhaust pressure measurement point; 11. a first air supply pressure measuring point; 12. a second air supply pressure measuring point; 13. a main blower control unit; 14. accompany and supply fan control unit.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
As shown in fig. 1, the single-seat blast furnace blower protection system of the present invention comprises a main blower 1 and an auxiliary blower 2, wherein the main blower 1 is communicated with a main air supply pipeline, and the main air supply pipeline is sequentially provided with a first check valve 3, a first air outlet valve 5 and a first air supply valve 7; accompany air supply machine 2 and accompany the air supply pipeline and be linked together, accompany and set gradually second check valve 4 on the air supply pipeline, second air outlet valve 6, second blast valve 8, main air supply pipeline is linked together with accompanying the air supply pipeline through complementing the air supply pipeline, main air supply machine 1 normal operating, accompany air supply machine 2 and adopt low wind pressure operation, the exhaust pressure is less than main air supply machine pressure, second check valve 4 is in reverse isolation state, main air supply machine 1 breaks down, first check valve forces the back of closing, accompany air supply machine 2 automatic loading, the exhaust pressure rises, main air supply machine 1 air supply pipe network pressure continues to fall to be less than the exhaust pressure of accompanying air supply machine 2, second check valve 4 back and forth pressure difference value changes, it turns into forward switch-on automatically to change by reverse isolation, for the blast furnace air supply, avoid the blast furnace air break accident because of main air supply machine 1 trouble leads to.
Specifically, main air supply fan 1 electricity be connected with main air supply fan control unit 13, accompany air supply fan 2 electricity to be connected with accompany air supply fan control unit 14, main air supply fan control unit 13 is connected with accompany air supply fan control unit 14 electricity, the air supply pressure when the air supply interruption fault signal of main air supply fan 1 and trouble feeds back to main air supply fan control unit 13 in time, accompany air supply fan control unit 14 to obtain the feedback signal of main air supply fan control unit 13, the pressure of exhaust of load accompany air supply fan 2 guarantees that the blast furnace normally functions. In addition, a first exhaust pressure measuring point 9 and a first supply pressure measuring point 11 are arranged on the main air supply pipeline, and a second exhaust pressure measuring point 10 and a second supply pressure measuring point 12 are arranged on the auxiliary air supply pipeline (the arrangement positions of the pressure measuring points are schematically indicated in fig. 1). The first exhaust pressure measuring point 9 is located between the main air supply fan 1 and the first check valve 3, the first supply pressure measuring point 11 is located between the first air outlet valve 5 and the first supply valve 7, and the second supply pressure measuring point 12 is located between the second air outlet valve 6 and the second supply valve 8. The pressure values of the first exhaust pressure measuring point 9 and the first air supply pressure measuring point 11 are fed back to the main air supply fan control unit 13 in real time, the pressure values of the second exhaust pressure measuring point 10 and the second air supply pressure measuring point 12 are fed back to the auxiliary air supply fan control unit 14 in real time, the pressure value of the second exhaust pressure measuring point 10 rises to the pressure value of the first air supply pressure measuring point 11 when a fault occurs, and the loading of the auxiliary air supply fan 2 is stopped.
In this single seat blast furnace fan guarantor system of implementing, when main air supply fan 1 normal during operation, accompany air supply fan 2 and can maintain minimum load operation, reduce the energy consumption, the specific second blast valve 8 of accompanying on the air supply pipe says opens totally, and second blast valve 6 is opened 25% -30%, when reducing the energy consumption, has guaranteed the safety need of blast furnace, and conveniently closes the valve and withdraws from and accompany the confession. At the moment, the exhaust pressure of the auxiliary air supply fan is far lower than the pressure of the main air supply fan, and the second check valve 4 on the auxiliary air supply pipeline is in a reverse isolation state, so that the influence of the main air supply fan on the normal air supply of the blast furnace is avoided.
When the main air supply fan 1 fails and the first check valve is forcibly closed, the pressure of the air supply pipe network of the main air supply fan continuously drops to be lower than the exhaust pressure of the auxiliary air supply fan, the pressure difference between the front and the rear of the second check valve 4 changes, the reverse isolation is automatically changed into the forward connection, air is supplied to the blast furnace, and the major loss caused by the air break of the blast furnace is avoided. Meanwhile, a fault signal and the air supply pressure during fault are fed back to the control unit, after the control unit receives the feedback information, the control unit controls the auxiliary air supply fan 2 to automatically load, the auxiliary air supply fan 2 opens a large static blade angle and closes a small air release valve, the loading is completed within 30s, sufficient air supply quantity is provided, and the normal operation of the blast furnace is guaranteed. In order to keep the working point of the fan in a stable working area, the closing operation of the air release valve is started after about 3 seconds of the opening operation of the angle of the static blade. Of course, under the condition of the same loading speed, if the air supply pressure is low during the fault, the loading is not added to the normal state, namely the limited stop loading, and the time is not used for 30 seconds.
Example 2
The control method of the single-seat blast furnace blower protection supply system in the embodiment utilizes the protection supply system in the embodiment 1 to supply air, and mainly comprises the following steps:
(1) and a main supply program is set in the main air supply machine control unit, the main air supply machine control unit selects to be switched in and out through a button, and after the main air supply machine is selected to be switched in, if the main air supply machine has a fault, a fault signal and air supply pressure during the fault are sent out when air supply is interrupted.
(2) The auxiliary supply program is set in the auxiliary supply fan control unit, the auxiliary supply program is selected to be put in and taken out through a button, and after the auxiliary supply program is selected to be put in, if fault signals of other fans are received, automatic loading can be carried out, namely, the large stationary blade is opened and the small air release valve is closed.
(3) In order to ensure the safety of the blast furnace and the auxiliary air supply fan, the auxiliary air supply fan is uniformly loaded within 30 seconds, in order to further keep the working point of the fan in a stable working area, the closing operation of the air release valve is delayed for about 3 seconds after the opening operation of the angle of the static blade, the angle of the static blade is set to be the maximum limit value, namely the angle in normal operation is generally about 70%, and the air supply pressure is stopped from being loaded when the exhaust pressure rises to the fault air supply pressure in the loading process of the auxiliary air supply fan.
(4) When a single-seat blast furnace is produced, a main air supply machine is put into a main supply program, the auxiliary air supply machine is started, the lowest load operation is maintained, the auxiliary supply program is put into the main supply program, whether the check valve is closed in place or not is checked, if the check valve is not closed in place, a manual safe operation program (a safety protection program of the check valve, which can enable the check valve to be automatically unloaded and forcibly closed) is executed, and the check valve is recovered after being closed in place. One of the two electric valves on the air pipe of the accompanying air supply fan is opened fully, and the other electric valve is opened by 25-30%, and the air supply valve is opened fully and the air outlet valve is opened by 25-30%. The opening degree of the valve can ensure the safety requirement of the blast furnace, and the valve can be conveniently closed to exit the accompanying supply. When the auxiliary air supply device works normally, the air supply pressure of the main air supply machine is higher than the exhaust pressure of the auxiliary air supply machine by more than 50kPa, when the blast furnace is greatly de-aired until the pressure difference value is less than 50kPa, the auxiliary air supply machine air outlet valve is closed firstly to prevent the air supply pressure from continuously descending to cause the automatic switch-on of the check valve of the auxiliary air supply machine, and the auxiliary air supply mode is quitted.
(5) When the main air supply machine has a fault and air supply is interrupted, the auxiliary air supply machine automatically loads air supply, the auxiliary air supply machine is quitted from the auxiliary air supply program, the air outlet valve is fully opened, and the working condition of the air supply machine is adjusted according to the requirement of the blast furnace. And resetting the main supply fan and the auxiliary supply fan after the standby fan is started.
The accompanying air supply fan in the embodiment can be an electric fan, is suitable for quick loading, can be a fan with a power smaller than that of a main air supply fan, and can ensure certain air supply amount to avoid the air break of the blast furnace when the main air supply fan breaks down, so that the power consumption for accompanying operation can be reduced.
In the single-seat blast furnace blower supply system and the control method thereof in the embodiment, in the air supply system with two or more blowers in the production of a single-seat blast furnace, one main blower supplies air, the other auxiliary blower runs at low pressure, the exhaust pressure is lower than the pressure of the main blower, and the electric blower on the air pipeline of the auxiliary blower is in an opening state and is isolated from the blast furnace pipeline through a check valve. When the main air supply machine has fault air supply interruption and the first check valve is forcibly closed, a fault signal of the main air supply machine is transmitted to the accompanying air supply machine, the accompanying air supply machine receives the signal and then automatically loads to enable the outlet pressure of the accompanying air supply machine to continuously rise, and when the pressure of an air supply pipe network of the original main air supply machine continuously drops to be lower than the exhaust pressure of the accompanying air supply machine, the check valve of the accompanying air supply machine automatically opens to supply air to the blast furnace, so that the blast furnace production can be timely, safely and reliably recovered. Meanwhile, when the main air supply fan works normally, the auxiliary air supply fan runs at the lowest negative pressure, the contradiction between safety and economy in air supply maintenance during production of a single blast furnace is effectively solved, and the operation is simplified.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. The utility model provides a single seat blast furnace fan guarantor supplies system which characterized in that: the air supply system comprises a main air supply fan (1) and an auxiliary air supply fan (2), wherein the main air supply fan (1) is communicated with a main air supply pipeline, and a first check valve (3), a first air outlet valve (5) and a first air supply valve (7) are sequentially arranged on the main air supply pipeline; the auxiliary air supply fan (2) is communicated with the auxiliary air supply pipeline, a second check valve (4), a second air outlet valve (6) and a second air supply valve (8) are sequentially arranged on the auxiliary air supply pipeline, the main air supply pipeline is communicated with the auxiliary air supply pipeline through an air supply pipeline, and the second check valve (4) isolates the air supply pipeline from the auxiliary air supply pipeline when the main air supply fan (1) normally works; when the main air supply fan (1) breaks down, the auxiliary air supply fan (2) is loaded, so that the front-back pressure difference value of the second check valve (4) changes, and the second check valve (4) is automatically switched from isolation to connection to supply air for the blast furnace.
2. The single-seat blast furnace blower power-saving system according to claim 1, wherein: main air feed machine (1) electricity be connected with main air feed machine control unit (13), accompany air feed machine (2) electricity and be connected with and accompany air feed machine control unit (14), main air feed machine control unit (13) with accompany air feed machine control unit (14) electricity and be connected, the air feed interruption fault signal real-time feedback of main air feed machine (1) is to main air feed machine control unit (13), accompany air feed machine control unit (14) and obtain the feedback signal of main air feed machine control unit (13), the instruction is accompanied air feed machine (2) automatic loading, improve its exhaust pressure, guarantee the normal operation of blast furnace.
3. The single-seat blast furnace blower power-saving system according to claim 2, wherein: a first exhaust pressure measuring point (9) is arranged between the main air supply fan (1) and the first check valve (3), a first air supply pressure measuring point (11) is arranged between the first air outlet valve (5) and the first air supply valve (7), a second exhaust pressure measuring point (10) is arranged between the auxiliary air supply fan (2) and the second check valve (4), and a second air supply pressure measuring point (12) is arranged between the second air outlet valve (6) and the second air supply valve (8).
4. The single-seat blast furnace blower power-saving system according to claim 3, wherein: the pressure values of the first exhaust pressure measuring point (9) and the first air supply pressure measuring point (11) are fed back to the main air supply machine control unit (13) in real time, and the pressure values of the second exhaust pressure measuring point (10) and the second air supply pressure measuring point (12) are fed back to the auxiliary air supply machine control unit (14) in real time.
5. A control method of a single-seat blast furnace fan power-saving system is characterized by comprising the following steps: the method for supplying air by using the air supply system of claim 4 comprises the following steps,
s1, setting a main supply program in the main air supply fan control unit (13), and sending a fault signal and air supply pressure during fault to the subsidiary air supply fan (2) when the main air supply fan (1) breaks down and air supply is interrupted after selection is put into use;
s2, an accompanying program is set in an accompanying fan control unit (14), and after the main fan control unit is selected to be put into operation, the main fan control unit receives a fault signal and automatically loads the fault signal, so that the air volume and the air pressure of the main fan control unit are improved;
s3, when the single-seat blast furnace is produced, the main air supply fan (1) is put into a main supply program, the auxiliary air supply fan (2) maintains the lowest load operation, and the auxiliary program is put into the auxiliary supply program;
s4, the main air supply fan (1) breaks down, the first check valve is forcibly closed, the auxiliary air supply fan (2) automatically loads air supply, after the air supply to the blast furnace, the auxiliary air supply fan (2) quits the auxiliary air supply program, and the second air outlet valve (6) is fully opened to form the main air supply fan;
and S5, resetting the main air supply fan and the auxiliary air supply fan after the standby fan is started.
6. The control method of the single-seat blast furnace blower power-saving system according to claim 5, characterized in that: the air supply pressure of the normal work of the main air supply fan (1) is higher than the exhaust pressure of the auxiliary air supply fan (2) by more than 50kPa, and when the blast furnace is greatly reduced to the pressure difference value smaller than 50kPa, the second air outlet valve (6) of the auxiliary air supply fan (2) is closed, and the auxiliary air supply mode is quitted.
7. The control method of the single-seat blast furnace blower power-saving system according to claim 6, characterized in that: and when the pressure value of the second exhaust pressure measuring point (10) rises to the pressure value of the first air supply pressure measuring point (11) during fault, the loading of the air supply fan (2) is stopped.
8. The control method of the single-seat blast furnace blower power-saving system according to claim 7, characterized in that: when the main air supply fan (1) breaks down, the auxiliary air supply fan (2) opens a large static blade angle and closes a small air release valve, and loading is completed within T1 time, wherein T1 is not more than 30S.
9. The control method of the single-seat blast furnace blower power-saving system according to claim 8, characterized in that: when the auxiliary air supply fan (2) receives a fault signal, a large stator blade angle is opened first, and the closing operation of the air release valve lags the opening operation of the stator blade angle.
10. The control method of the single-seat blast furnace blower power-saving system according to claim 9, characterized in that: when the main air supply fan (1) works normally, the second air supply valve (8) on the accompanying air supply pipeline is opened fully, and the second air outlet valve (6) is opened by 25-30%.
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| CN114752721B (en) | 2023-08-25 |
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