CN112503566B - Fan switching method - Google Patents
Fan switching method Download PDFInfo
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- CN112503566B CN112503566B CN202110150404.9A CN202110150404A CN112503566B CN 112503566 B CN112503566 B CN 112503566B CN 202110150404 A CN202110150404 A CN 202110150404A CN 112503566 B CN112503566 B CN 112503566B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims 2
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000004568 cement Substances 0.000 abstract description 5
- 238000010304 firing Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/003—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by throttling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/005—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by changing flow path between different stages or between a plurality of compressors; Load distribution between compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
Abstract
The invention relates to the technical field of cement firing, and particularly discloses a fan switching method.A main fan and a standby fan device comprise a first fan and a second fan which are arranged in parallel, a first pressure sensor, a first check valve, a release valve and a stop valve are arranged on a first branch, a second check valve is arranged on a second branch, the first fan replaces the second fan, the first fan is adjusted to a rotating speed capable of providing a preset pressure value for a burner by controlling the release valve, at the moment, the stop valve is opened and the second fan is closed, and the air pressure in the burner is kept at a preset value; the method is characterized in that the mode of gradually closing the air release valve and gradually reducing the rotating speed of the first fan is combined until the air release valve is completely closed. The arrangement reduces the energy consumption of the first fan, maintains the stability of the gas pressure entering the furnace through the burner to the maximum extent, avoids the rapid reduction of the temperature in the furnace, stabilizes the production process and ensures the quality of products.
Description
Technical Field
The invention relates to the technical field of cement firing, in particular to a fan switching method.
Background
The cement is generally fired by a converter, a burner is arranged at the kiln head, and pulverized coal is blown into the converter for combustion through air with certain pressure in the burner. In the production process, the converter is generally provided with a main fan and a standby fan, so that the main fan and the standby fan can be conveniently switched to deal with the condition that the main fan fails. In order to keep the temperature in the furnace stable, it is necessary to ensure the intake pressure to be constant. However, in the production process, if the traditional method of switching the standby fan is adopted, the main fan in operation needs to be stopped, the valve of the standby fan is opened, and then the standby fan is started, so that long-time gas stop and coal stop in the furnace can be caused in the process, the temperature in the furnace can be also sharply reduced, and the firing quality of cement is further influenced.
Disclosure of Invention
The invention aims to: the fan switching method is provided to solve the problems that the temperature in the furnace is sharply reduced in the process of switching the standby fan and the firing quality of cement is affected.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a fan switching method, and a main fan device and a standby fan device comprise:
the first fan and the second fan are arranged in parallel and are respectively communicated with the main branch through a first branch and a second branch;
a first pressure sensor, a first check valve, a release valve and a stop valve are sequentially arranged between the first fan and the main branch of the first branch; the first pressure sensor is used for detecting the air pressure in the first branch; the first check valve is used for preventing gas from flowing towards the first fan; the air relief valve is used for relieving the pressure of the first branch; the stop valve is used for controlling the connection and disconnection of the first branch and the main branch;
a second check valve is arranged between the second fan and the main branch of the second branch; the second check valve is used for preventing gas from flowing towards the second fan;
the tail end of the main branch is provided with a burner, and the first fan and the second fan can provide gas for the burner;
the method is characterized in that a first state that the first fan is in a shutdown state and the second fan is in a working state is switched to a second state that the first fan is in the working state and the second fan is in the shutdown state, and the method comprises the following steps:
s001, controlling the air release valve to be fully opened;
s002, starting the first fan to reach a rated rotating speed;
s003, gradually closing the air release valve until the value P1 of the first pressure sensor is equal to a preset value P;
s004, controlling the stop valve to be fully opened;
s005, turning off the second fan;
s006, gradually closing the air release valve until the value P1 of the first pressure sensor is equal to a preset value P;
s007, judging whether the air release valve is completely closed, if not, executing step S008 and returning to step S006, and if so, executing step S009;
s008, reducing the wind speed of the first fan;
and S009, completing the switching.
Optionally, in step S008, the rotation speed of the first fan is reduced at each time by 1-5 rpm.
Alternatively, between steps S006-S007, stabilize for 5-10 minutes.
Optionally, a second pressure sensor is arranged on the second branch between the second fan and the second check valve; the second pressure sensor is used for detecting the air pressure in the second branch circuit;
the method is switched from a second state that the first fan is in a working state and the second fan is in a stop state to a first state that the first fan is in a stop state and the second fan is in a working state, and comprises the following steps:
s101, gradually starting the second fan until the value P2 of the second pressure sensor is equal to a preset value P;
s102, controlling the air release valve to be fully opened, and then closing the first fan;
s103, accelerating the second fan to a rated rotating speed;
s104, gradually closing the stop valve until the value P2 of the second pressure sensor is equal to a preset value P;
s105, judging whether the stop valve is completely closed, if not, executing the step S106 and returning to the step S104, and if the stop valve is completely closed, executing the step S107;
s106, reducing the rotating speed of the second fan;
and S107, completing the switching.
Optionally, in step S106, the rotation speed of the second fan is reduced at each time to be 1-5 rpm.
Alternatively, between steps S104-S105, stabilization is for 5-10 minutes.
Optionally, the main branch is provided with a third pressure sensor, the third pressure sensor is configured to detect air pressure in the main branch, and the value of the preset value P is obtained through measurement by the third pressure sensor.
Optionally, the deflation valve is a first electric valve, the stop valve is a second electric valve, and the deflation valve and the stop valve are remotely controlled.
The invention has the beneficial effects that:
the invention provides a fan switching method, wherein a main fan device and a standby fan device are provided with a first fan and a second fan in parallel, a first pressure sensor, a first check valve, a release valve and a stop valve are arranged on a first branch, a second check valve is arranged on a second branch, the first fan can be adjusted to a rotating speed capable of providing a preset pressure value for a burner by controlling the release valve in the process of replacing the second fan by the first fan, at the moment, the stop valve is opened and the second fan is closed, and the air pressure in the burner is kept at a preset value; the mode of combining the step-by-step closing of the air release valve and the step-by-step reduction of the rotating speed of the first fan is adopted until the air release valve is completely closed, at the moment, the rotating speed of the first fan is the optimal value, and the energy consumption of the first fan is reduced. In the whole adjusting process, the stability of the pressure of the gas entering the furnace through the burner is maintained to the maximum extent, the temperature in the furnace is prevented from being reduced sharply, the production process is stabilized, and the quality of products is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a main/standby fan device in an embodiment of the present invention;
FIG. 2 is a flow chart of a fan switching method (a first fan replaces a second fan) according to an embodiment of the present invention;
fig. 3 is a flowchart of a fan switching method (a second fan replaces a first fan) in an embodiment of the present invention.
In the figure:
1. a first fan; 2. a first pressure sensor; 3. a first check valve; 4. a deflation valve; 5. a stop valve; 6. a second fan; 7. a second pressure sensor; 8. a second check valve; 9. a third pressure sensor; 10. a burner;
100. a first branch;
200. a second branch circuit;
300. a main branch.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the present embodiment provides a main and standby fan device, where the main and standby fan device includes a first fan 1 and a second fan 6 that are arranged in parallel, and the first fan 1 and the second fan 6 are respectively communicated with a main branch 300 through a first branch 100 and a second branch 200; the first branch 100 is provided with a first pressure sensor 2, a first check valve 3, a release valve 4 and a stop valve 5 between the first fan 1 and the main branch 300 in sequence; the first pressure sensor 2 is used for detecting the air pressure in the first branch 100; the first check valve 3 is used for preventing gas from flowing towards the first fan 1; the air relief valve 4 is used for relieving the pressure of the first branch 100; the stop valve 5 is used for controlling the connection and disconnection between the first branch 100 and the main branch 300; the second branch circuit 200 is provided with a second check valve 8 between the second fan 6 and the main branch circuit 300; the second check valve 8 is used for preventing the gas from flowing towards the second fan 6; the end of the main branch 300 is provided with a burner 10, and the first fan 1 and the second fan 6 can both provide gas to the burner 10.
In the embodiment, the first fan 1 and the second fan 6 are arranged in parallel, the first branch 100 is provided with the first pressure sensor 2, the first check valve 3, the air release valve 4 and the stop valve 5, and the second branch 200 is provided with the second check valve 8, so that the gas pressure entering the furnace through the burner 10 is kept to the maximum extent in the switching process of the first fan 1 and the second fan 6, the temperature in the furnace is prevented from being reduced sharply, the production process is stabilized, and the quality of products is ensured.
Optionally, a second pressure sensor 7 is disposed in the second branch 200 between the second blower 6 and the second check valve 8, and the second pressure sensor 7 is configured to detect the air pressure in the second branch 200. This arrangement facilitates recording of the value of the air pressure provided by the second fan 6 during the completion of the replacement of the first fan 1 by the second fan 6.
Preferably, the main branch 300 is provided with a third pressure sensor 9, and the third pressure sensor 9 is used for detecting the air pressure in the main branch 300. In the present embodiment, specifically, the third pressure sensor 9 is provided between the shutoff valve 5 and the combustor 10. This third pressure sensor 9's numerical value can be at first fan 1 replacement second fan 6 in-process, before opening stop valve 5, uses as the default, is convenient for do directly perceivedly contrast with first pressure sensor 2's numerical value, also can be before second fan 6 replacement first fan 1 in-process closes first fan 1, uses as the default, is convenient for do directly perceivedly contrast with second pressure sensor 7's numerical value, improves owner, the switching efficiency who is equipped with the fan.
Because the debugging process is actually carried out, remote operation is needed. Therefore, in the embodiment, the air release valve 4 is the first electric valve, the stop valve 5 is the second electric valve, the air release valve 4 and the stop valve 5 can be remotely controlled by the arrangement, the first fan 1 replaces the second fan 6, the second fan 6 replaces the first fan 1, the remote debugging is realized, the debugging time is shortened, and the execution cost is reduced.
As shown in fig. 2, this embodiment further provides a fan switching method, which is applicable to the active/standby fan device, and switches from a first state where the first fan 1 is in a shutdown state and the second fan 6 is in a working state to a second state where the first fan 1 is in a working state and the second fan 6 is in a shutdown state, where the method includes the following steps:
s001, controlling the air release valve 4 to be fully opened.
And S002, starting the first fan 1 to a rated rotating speed.
And S003, gradually closing the air release valve 4 until the value P1 of the first pressure sensor 2 is equal to the preset value P.
And S004, controlling the stop valve 5 to be fully opened.
And S005, turning off the second fan 6.
S006, gradually closing the air release valve 4 until the value P1 of the first pressure sensor 2 is equal to the preset value P.
And S007, judging whether the air release valve 4 is completely closed, if the air release valve 4 is not completely closed, executing the step S008 and returning to the step S006, and if the air release valve 4 is completely closed, executing the step S009.
And S008, reducing the wind speed of the first fan 1.
And S009, completing the switching.
Wherein the preset value P is a pressure value required in the burner 10.
Alternatively, in step S008, the rotation speed of the first fan 1 is reduced by 1 to 5 rpm each time. Preferably two revolutions per second. Of course, in other embodiments, the rotation speed per reduction may be other values, and for example, the rotation speed per reduction may be 3 rpm or 6 rpm other than 1-5 rpm.
Alternatively, between steps S006-S007, stabilize for 5-10 minutes. Preferably for 5 minutes. This arrangement is advantageous for improving the stability of the air pressure in the combustor 10.
As shown in fig. 3, this embodiment further provides a fan switching method, which is applicable to the active/standby fan device, and switches from a second state where the first fan 1 is in a working state and the second fan 6 is in a stop state to a first state where the first fan 1 is in a stop state and the second fan 6 is in a working state, where the method includes the following steps:
and S101, gradually starting the second fan 6 until the value P2 of the second pressure sensor 7 is equal to the preset value P.
And S102, controlling the air release valve 4 to be fully opened, and then closing the first fan 1.
And S103, accelerating the second fan 6 to a rated rotating speed.
S104, gradually closing the stop valve 5 until the value P2 of the second pressure sensor 7 is equal to the preset value P.
And S105, judging whether the stop valve 5 is completely closed, if the stop valve 5 is not completely closed, executing the step S106 and returning to the step S104, and if the stop valve 5 is completely closed, executing the step S107.
And S106, reducing the rotating speed of the second fan 6.
And S107, completing the switching.
In step S103, the second fan 6 is accelerated to the rated rotation speed because the release valve 4 is fully opened and the stop valve 5 is fully opened after the first fan 1 is closed, and at this time, the air pressure provided by the second fan 6 for the burner 10 is smaller than the preset value P after the pressure relief through the stop valve 5 and the release valve 4. At this time, the second fan 6 is adjusted to the rated rotation speed, and the air pressure entering the burner 10 will also be smaller than the preset value P, so the split flow is reduced by gradually closing the stop valve 5 to increase the air pressure entering the burner 10. In addition, in the case of the rated rotation speed of the second fan 6, when the stop valve 5 is fully closed, the air pressure entering the burner 10 will be higher than the preset value P, therefore, it is also necessary to close the stop valve 5 and simultaneously reduce the rotation speed of the second fan 6, wherein when P2 is equal to P and the stop valve 5 is not fully closed, the rotation speed of the second fan 6 is reduced until P2 is equal to P and the stop valve 5 is fully closed.
This setting makes second fan 6 replace the whole process of first fan 1, furthest has kept the stability of the gas pressure who gets into the stove through combustor 10, avoids the interior temperature of stove to reduce sharply, has stabilized production technology, has guaranteed the quality of product.
Alternatively, in step S106, the rotation speed of the second fan 6 is reduced at each time to 1 to 5 rpm. Preferably two revolutions per second. Of course, in other embodiments, the rotation speed per reduction may be other values, and for example, the rotation speed per reduction may be 3 rpm or 6 rpm other than 1-5 rpm.
Alternatively, between steps S104-S105, stabilization is for 5-10 minutes. Preferably for 5 minutes. This arrangement is advantageous for improving the stability of the air pressure in the combustor 10.
Alternatively, the first fan 1 and the second fan 6 may be one or both of a magnetic levitation fan and a roots fan.
Optionally, the air release valve 4 and the stop valve 5 are both rotary valve bodies, and are in a fully open state when opened at 90 degrees; and the state is fully closed when the switch is opened at 0 degrees.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A fan switching method is characterized in that a main fan device and a standby fan device comprise:
the air conditioner comprises a first fan (1) and a second fan (6), wherein the first fan (1) and the second fan (6) are arranged in parallel and are respectively communicated with a main branch (300) through a first branch (100) and a second branch (200);
a first pressure sensor (2), a first check valve (3), a release valve (4) and a stop valve (5) are sequentially arranged between the first fan (1) and the main branch (300) of the first branch (100); the first pressure sensor (2) is used for detecting the air pressure in the first branch (100); the first check valve (3) is used for preventing gas from flowing towards the first fan (1); the air relief valve (4) is used for relieving the pressure of the first branch (100); the stop valve (5) is used for controlling the connection and disconnection of the first branch (100) and the main branch (300);
a second check valve (8) is arranged between the second fan (6) and the main branch (300) of the second branch (200); the second check valve (8) is used for preventing gas from flowing towards the second fan (6);
a burner (10) is arranged at the tail end of the main branch (300), and the first fan (1) and the second fan (6) can provide gas for the burner (10);
switching from a first state in which the first fan (1) is in a shutdown state and the second fan (6) is in an operating state to a second state in which the first fan (1) is in an operating state and the second fan (6) is in a shutdown state, comprising the steps of:
s001, controlling the air release valve (4) to be fully opened;
s002, starting the first fan (1) to a rated rotating speed;
s003, gradually closing the air release valve (4) until the value P1 of the first pressure sensor (2) is equal to a preset value P;
s004, controlling the stop valve (5) to be fully opened;
s005, turning off the second fan (6);
s006, gradually closing the air release valve (4) until the value P1 of the first pressure sensor (2) is equal to a preset value P;
s007, judging whether the deflation valve (4) is completely closed, if the deflation valve (4) is not completely closed, executing the step S008 and returning to the step S006, and if the deflation valve (4) is completely closed, executing the step S009;
s008, reducing the wind speed of the first fan (1);
and S009, completing the switching.
2. The fan switching method according to claim 1, wherein in step S008, the rotation speed of the first fan (1) per reduction is 1-5 rpm.
3. The fan switching method according to claim 1, wherein the stabilizing is performed for 5-10 minutes between steps S006-S007.
4. The fan switching method according to claim 1, wherein the second branch (200) is provided with a second pressure sensor (7) between the second fan (6) and the second check valve (8); the second pressure sensor (7) is used for detecting the air pressure in the second branch (200);
switching from a second state in which the first fan (1) is in a working state and the second fan (6) is in a stop state to a first state in which the first fan (1) is in a stop state and the second fan (6) is in a working state, comprising the steps of:
s101, gradually starting the second fan (6) until the value P2 of the second pressure sensor (7) is equal to a preset value P;
s102, controlling the air release valve (4) to be fully opened, and then closing the first fan (1);
s103, accelerating the second fan (6) to a rated rotating speed;
s104, gradually closing the stop valve (5) until the value P2 of the second pressure sensor (7) is equal to a preset value P;
s105, judging whether the stop valve (5) is completely closed, if the stop valve (5) is not completely closed, executing the step S106 and returning to the step S104, and if the stop valve (5) is completely closed, executing the step S107;
s106, reducing the rotating speed of the second fan (6);
and S107, completing the switching.
5. The fan switching method according to claim 4, wherein in step S106, the rotation speed of the second fan (6) is reduced at each time to be 1-5 rpm.
6. The fan switching method according to claim 4, wherein the stabilization is performed for 5-10 minutes between steps S104-S105.
7. The blower switching method according to claim 1, wherein the main branch (300) is provided with a third pressure sensor (9), the third pressure sensor (9) is used for detecting the air pressure in the main branch (300), and the value of the preset value P is measured by the third pressure sensor (9).
8. The fan switching method according to claim 1, wherein the purge valve (4) is a first electric valve, the stop valve (5) is a second electric valve, and the purge valve (4) and the stop valve (5) are remotely controlled.
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| CN202110150404.9A CN112503566B (en) | 2021-02-04 | 2021-02-04 | Fan switching method |
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| CN202110150404.9A CN112503566B (en) | 2021-02-04 | 2021-02-04 | Fan switching method |
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| CN112503566A CN112503566A (en) | 2021-03-16 |
| CN112503566B true CN112503566B (en) | 2021-04-27 |
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| CN114752721B (en) * | 2022-03-23 | 2023-08-25 | 马鞍山钢铁股份有限公司 | Single-seat blast furnace fan supply protection system and control method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| US20030223003A1 (en) * | 2002-03-21 | 2003-12-04 | Guy Meynants | Fast and low-power multiplexing circuit and use thereof in imaging devices |
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