CN113279993B - Boiler fan dual-drive control system and method based on 3S coupler - Google Patents
Boiler fan dual-drive control system and method based on 3S coupler Download PDFInfo
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- CN113279993B CN113279993B CN202110393774.5A CN202110393774A CN113279993B CN 113279993 B CN113279993 B CN 113279993B CN 202110393774 A CN202110393774 A CN 202110393774A CN 113279993 B CN113279993 B CN 113279993B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 230000008878 coupling Effects 0.000 claims abstract description 30
- 238000010168 coupling process Methods 0.000 claims abstract description 30
- 238000005859 coupling reaction Methods 0.000 claims abstract description 30
- 239000000523 sample Substances 0.000 claims description 28
- 230000009977 dual effect Effects 0.000 claims description 10
- 239000003245 coal Substances 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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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
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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
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
- F04D25/045—Units comprising pumps and their driving means the pump being fluid-driven the pump wheel carrying the fluid driving means, e.g. turbine blades
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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
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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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
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The application relates to a boiler fan dual-drive control system and a method based on a 3S coupling, wherein the system comprises a drive motor, the 3S coupling, a back pressure steam turbine and a dual-drive control device; the driving motor is connected with the 3S coupler, the 3S coupler is connected with the back pressure steam turbine, and the back pressure steam turbine is connected with the boiler fan to be driven; the double-drive control device is respectively connected with the driving motor, the back pressure steam turbine and the boiler fan. The back pressure steam turbine drives the boiler fan by utilizing the steam heat with rich heat supply source, so that the waste of steam energy can be reduced. When the back pressure turbine cannot provide enough driving force, the driving motor and the back pressure turbine jointly drive the boiler fan so as to ensure the normal operation of the boiler fan.
Description
Technical Field
The application relates to the technical field of heat recovery, in particular to a boiler fan dual-drive control system and method based on a 3S coupler.
Background
Under the large trend of energy conservation and emission reduction, the recovery of the abundant energy of industrial heat supply and the abundant energy of heat supply of a thermal power plant is imperative, and the industrial heat supply and the thermal power plant generally supply heat to the outside at present, but because the heat supply source and a heat user have unmatched problems and the reliability requirement of heat supply, the heat supply pressure is generally higher than the requirement of the heat user, so that the heat supply thermodynamic system has larger energy waste.
For general industrial users, the required steam pressure is generally 1.2-1.5MPa, the temperature is about 200-300 ℃, the steam demand is more than 100t/h, and the conventional factory steam grade of the existing thermal power plant is more than 0.8-1.0MPa, so that when the industrial users need the existing thermal power plant to provide steam for heat supply, the existing thermal power system of the power plant cannot provide effective and proper steam sources. One common practice is to: directly connecting an outlet of high-temperature high-pressure steam (the pressure is 12MPa under the general condition and the temperature is above 540 ℃) of a boiler with a temperature and pressure reducer to supply heat to a user; another common practice is: steam is led out through a high-pressure cylinder of a steam turbine generator unit (about 2.8-3.8MPa and 330 ℃ C.) or a medium-pressure cylinder (about 2.8-3.8MPa and 530 ℃ C.) and then supplied to industrial users through a temperature and pressure reducer. The two methods cause larger steam supply pressure loss due to the use of the temperature and pressure reducer, so that the steam energy is wasted greatly.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the application provides a boiler fan dual-drive control system and a boiler fan dual-drive control method based on a 3S coupler.
In a first aspect, the present application provides a dual driving control system for a boiler fan based on a 3S coupling, including: the device comprises a driving motor, a 3S coupler, a back pressure steam turbine and a double-drive control device;
The driving motor is connected with the 3S coupler, the 3S coupler is connected with the back pressure steam turbine, and the back pressure steam turbine is connected with the boiler fan to be driven; the double-drive control device is respectively connected with the driving motor, the back pressure steam turbine and the boiler fan;
The double-drive control device is used for acquiring the rotor rotating speed of the back pressure steam turbine if the boiler fan is independently driven by the back pressure steam turbine currently in the operation process of the boiler fan, controlling the driving motor to start if the rotor rotating speed is smaller than a preset working rotating speed, controlling the rotor rotating speed of the driving motor to be larger than the preset working rotating speed so that the driving motor is in locking engagement with the back pressure steam turbine through the 3S coupling, and jointly driving the boiler fan by the driving motor and the back pressure steam turbine.
In a second aspect, the application provides a double-drive control method for a boiler fan based on a 3S coupling, which is realized based on the double-drive control system provided in the first aspect; the method comprises the following steps:
In the running process of the boiler fan, if the double-drive control device determines that the boiler fan is currently driven by the back pressure steam turbine independently, acquiring the rotor rotating speed of the back pressure steam turbine, and judging whether the rotor rotating speed is smaller than a preset working rotating speed or not;
If yes, the double-drive control device controls the driving motor to start, and controls the rotor rotating speed of the driving motor to be larger than the preset working rotating speed, so that the driving motor is in locking engagement with the back pressure turbine through the 3S coupler, and the driving motor and the back pressure turbine jointly drive the boiler fan.
According to the boiler fan double-drive control system and method based on the 3S coupler, as the system comprises the driving motor and the back pressure turbine, the back pressure turbine can drive the boiler fan by utilizing the steam heat with abundant heat supply sources, so that the waste of steam energy can be reduced. When the rotor rotating speed of the back pressure turbine is smaller than the preset working rotating speed, namely, the back pressure turbine cannot provide enough driving force, the motor is started, and the driving motor is locked and meshed with the back pressure turbine through the 3S coupler, so that the boiler fan is driven by the driving motor and the back pressure turbine together, and the normal operation of the boiler fan is ensured. Moreover, due to the back pressure steam turbine, the high-temperature and high-pressure steam can be converted into the steam meeting the pressure and temperature required by the heat user.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a boiler fan dual-drive control system based on a 3S coupling;
FIG. 2 is a schematic flow chart of a boiler fan dual-drive control method based on a 3S coupling;
reference numerals: 1-a drive motor; 2-3S coupling; 3-back pressure steam turbines; 4-a double-drive control device; 5-a boiler fan; 6-a first speed measuring probe; 7-a second speed measuring probe; 8-a second drive shaft; 9-a first drive shaft; 10-a third drive shaft; 11-an air inlet pipeline of the back pressure steam turbine; 12-an air outlet pipeline of the back pressure steam turbine; 13-an inlet steam pipe of the back pressure steam turbine; 14-heat supply pipeline of back pressure steam turbine.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In a first aspect, the present application provides a dual driving control system for a boiler fan based on a 3S coupling, as shown in fig. 1, the system includes: the device comprises a driving motor 1, a 3S coupler 2, a back pressure turbine 3 and a double-drive control device 4.
The driving motor 1 is connected with the 3S coupler 2, the 3S coupler 2 is connected with the back pressure steam turbine 3, and the back pressure steam turbine 3 is connected with a boiler fan 5 to be driven; the double-drive control device 4 is respectively connected with the driving motor 1, the back pressure steam turbine 3 and the boiler fan 5;
the dual-drive control device 4 is configured to obtain a rotor rotation speed of the back pressure turbine 3 if the boiler fan 5 is currently driven by the back pressure turbine 3 alone during an operation process of the boiler fan 5, and to control the driving motor 1 to start if the rotor rotation speed is less than a preset working rotation speed, and to control the rotor rotation speed of the driving motor 1 to be greater than the preset working rotation speed, so that the driving motor 1 is in locking engagement with the back pressure turbine 3 through the 3S coupling 2, and the driving motor 1 and the back pressure turbine 3 jointly drive the boiler fan 5.
It is understood that the boiler fan 5 may be a fan, a draught fan or a primary fan of a boiler, and specifically may be a fan, a draught fan or a primary fan of any industrial purpose.
It will be appreciated that the boiler driven by the boiler fan 5 may be any type of industrial type boiler machine, including any type of power plant boiler. For example, drum boilers, once-through boilers, high pressure boilers, subcritical unit boilers, supercritical unit boilers, pulverized coal boilers or circulating fluidized bed boilers.
It will be appreciated that the air in the inlet duct 11 of the boiler blower 5 may come from anywhere and in the power plant, whether inside or outside the furnace, high or low. The outlet duct 12 of the boiler fan 5 may be connected to a power plant boiler.
It can be understood that the back pressure steam turbine 3 is a steam turbine with the exhaust pressure being greater than the atmospheric pressure, and the design value of the exhaust pressure of the back pressure steam turbine 3 depends on different heat supply purposes, and the back pressure steam turbine 3 can convert the input high-temperature high-pressure steam into the steam with the pressure and the temperature required by the heat user.
It can be understood that the input driving steam of the back pressure turbine 3 enters from the steam inlet pipeline 13 thereof, and the input driving steam is a high-pressure heat supply steam source and can come from a main steam source of a turbine generator unit of a power plant; the system can also come from a reheat steam source, and specifically comprises a cold section of reheat steam and a hot section of reheat steam; but also from any purpose of industrial steam or heating steam. The exhaust steam of the back pressure turbine 3 is discharged through a heat supply pipeline 14, and the discharged steam can supply heat for any industry, civil heating, heat supply of any pressure and temperature grade, and the like.
It is understood that the double drive control device 4 may be connected to the drive motor 1, the back pressure turbine 3 and the boiler fan 5 via signal cables and control cables.
It is understood that the dual drive control device 4 may be various types of control devices, such as an in-situ programmable logic control device, a remote sequential control device, a distributed control device, etc.
It will be appreciated that in the system provided by the present solution, the two drives are the drive motor 1 and the back pressure turbine 3, and the two drives are connected by the 3S coupling 2 therebetween. When the driving motor 1 and the back pressure steam turbine 3 are in locking engagement through the 3S coupler 2, the boiler fan 5 can be driven by the driving motor 1 and the back pressure steam turbine 3 together or can be driven by the driving motor 1 alone. When the back pressure turbine 3 is driven by the driving motor 1 alone, the back pressure turbine 3 is in a stop state, and the rotor of the back pressure turbine 3 is driven by the driving motor 1 to rotate. When driven by the driving motor 1 and the back pressure turbine 3 together, the driving motor 1 provides a part of power, and the back pressure turbine 3 provides a part of power, so that the rotation speed of the boiler fan 5 can meet the working requirement.
It will be appreciated that if the back pressure turbine 3 is driven alone when the boiler fan 5 starts to operate, the amount of driving steam input into the back pressure turbine 3 gradually decreases with the lapse of time, so that the power obtained by the back pressure turbine 3 gradually decreases, and the rotor speed of the back pressure turbine 3 gradually decreases. If the rotor speed of the back pressure turbine 3 drops below the preset operating speed, the power provided by the back pressure turbine 3 cannot enable the speed of the boiler fan 5 to reach the operating requirement, and the driving motor 1 and the back pressure turbine 3 are required to be driven together.
Of course, if the rotor speed of the back pressure turbine 3 is always greater than the preset operating speed, it may be always driven by the back pressure turbine 3 alone. That is, the dual drive control device may also be used to: and if the rotor rotating speed of the driving motor 1 is greater than or equal to the preset working rotating speed, the double-drive control device 4 controls the back pressure steam turbine 3 to continuously and independently drive the boiler fan 5.
In specific implementation, the dual-drive control device 4 may further include: a first drive shaft 9, a second drive shaft 8, a third drive shaft 10, a first tachometer probe 6 and a second tachometer probe 7; the 3S coupler 2 is connected with the back pressure turbine 3 through the first driving shaft 9, the driving motor 1 is connected with the 3S coupler 2 through the second driving shaft 8, and the back pressure turbine 3 is connected with the boiler fan 5 through the third driving shaft 10; the first speed measuring probe 6 is arranged on the first driving shaft 9, the second speed measuring probe 7 is arranged on the second driving shaft 8, and the first speed measuring probe 6 and the second speed measuring probe 7 are connected to the double-drive control device 4.
That is, one end of the 3S coupling 2 is connected to the back pressure turbine 3 through the first driving shaft 9, and the other end is connected to the driving motor 1 through the second driving shaft 8, so that the back pressure turbine 3 is in locking engagement with the driving motor 1 when the 3S coupling 2 couples the two shafts. And when the 3S coupling 2 disengages the two shafts, the back pressure turbine 3 is in a disengaged state with the driving motor 1.
In this way, the dual drive control device 4 can be used in particular for: acquiring a first rotating speed of the first driving shaft 9 through the first speed measuring probe 6, and acquiring a second rotating speed of the second driving shaft 8 through the second speed measuring probe 7; the first rotation speed is the rotor rotation speed of the back pressure turbine 3, and the second rotation speed is the rotor rotation speed of the driving motor 1.
The first tachometer probe 6 and the second tachometer probe 7 can be any type of tachometer probe, including various types such as key phase pulse type, reflective pulse type, multi-tooth pulse type, etc.
The 3S coupling 2, i.e., SSS coupling (Synchro-Self-Shifting coupling), is a clutch coupling that can disengage or couple two shafts during full-speed operation. When the rotational speeds of the two driving shafts at the two ends of the 3S coupling 2 are the same, the 3S coupling 2 automatically moves axially to be engaged, and once the rotational speed of the driving shaft at the input side is lower than the rotational speed of the driving shaft at the output side, the 3S coupling 2 disengages the two driving shafts. For example, when the boiler fan 5 is driven by the driving motor 1 and the back pressure turbine 3, the second driving shaft 8 is the input side driving shaft, the first driving shaft 9 is the output side driving shaft, and the rotation speed of the second driving shaft 8 is smaller than that of the first driving shaft 9, the 3S coupling 2 is disconnected from the two driving shafts.
According to the boiler fan double-drive control system based on the 3S coupler, which is provided by the application, as the system comprises the driving motor 1 and the back pressure turbine 3, the back pressure turbine 3 can drive the boiler fan 5 by utilizing the steam heat with abundant heat source, so that the waste of steam energy can be reduced. When the rotor rotation speed of the back pressure steam turbine 3 is smaller than the preset working rotation speed, that is, when the back pressure steam turbine 3 cannot provide enough driving force, the motor is started, so that the driving motor 1 is in locking engagement with the back pressure steam turbine 3 through the 3S coupler 2, and the driving motor 1 and the back pressure steam turbine 3 jointly drive the boiler fan 5 to ensure the normal operation of the boiler fan 5. Moreover, since the back pressure steam turbine 3 is used, the high-temperature and high-pressure steam can be converted into steam that meets the pressure and temperature required by the heat consumer.
In a second aspect, the present invention provides a dual driving control method for a boiler fan based on a 3S coupling, the dual driving control method is implemented based on the dual driving control system provided in the first aspect, as shown in fig. 2, and the method includes:
In the running process of the boiler fan, if the double-drive control device determines that the boiler fan is currently driven by the back pressure steam turbine independently, acquiring the rotor rotating speed of the back pressure steam turbine, and judging whether the rotor rotating speed is smaller than a preset working rotating speed or not;
If yes, the double-drive control device controls the driving motor to start, and controls the rotor rotating speed of the driving motor to be larger than the preset working rotating speed, so that the driving motor is in locking engagement with the back pressure turbine through the 3S coupler, and the driving motor and the back pressure turbine jointly drive the boiler fan.
It will be appreciated that during operation of the boiler blower, if the boiler blower is currently being driven solely by the back pressure turbine, that is to say, the drive motor is in a stopped state at this time, and the drive motor is in a disengaged state with the back pressure turbine via the 3S coupling.
It will be appreciated that, as the amount of the input driving steam of the back pressure turbine may gradually decrease over time, the driving force that the back pressure turbine can provide may also decrease, so the dual-drive control device may acquire the rotational speed of the back pressure turbine in real time or at intervals, if the rotor rotational speed of the back pressure turbine decreases to be less than the preset operating rotational speed, which indicates that the driving force of the back pressure turbine is insufficient to drive the boiler fan, the driving motor needs to be started at this time, when the rotor rotational speed of the driving motor increases to be the same as the rotor rotational speed of the back pressure turbine, the 3S coupling is in locking engagement with the driving motor and the back pressure turbine respectively, at this time, the rotor rotational speed of the driving motor needs to be still increased until being higher than the preset operating rotational speed, so as to meet the normal operating requirement of the boiler fan, and at this time, the boiler fan is driven by the driving motor and the back pressure turbine together.
Of course, if the rotor rotation speed of the back pressure turbine is greater than or equal to the preset working rotation speed, only the back pressure turbine is required to drive at this time, so that the dual-drive control device can control the back pressure turbine to continuously and independently drive the boiler fan.
It is understood that the above process is a treatment method during operation of the boiler fan.
In specific implementation, the method provided by the application can further comprise the following steps:
when the boiler fan is started, the double-drive control device judges whether the back pressure steam turbine has input drive steam or not;
if yes, the driving motor is disengaged from the back pressure steam turbine through the 3S coupler, and the back pressure steam turbine is started, so that the back pressure steam turbine drives the boiler fan;
If not, the driving motor is locked and meshed with the back pressure steam turbine through the 3S coupler, and the double-drive control device starts the driving motor so that the driving motor drives the boiler fan.
That is, when the boiler fan is just started, it is necessary to determine whether or not driving steam is input into the back pressure turbine, and if so, the back pressure turbine provides driving force, and at this time, the 3S coupling is disengaged from the driving motor and the back pressure turbine. If the back pressure steam turbine does not input driving steam, the back pressure steam turbine cannot provide driving force, the driving motor is required to be started at the moment, and the driving force is independently provided by the driving motor, so that the driving force of the driving motor can be transmitted to the boiler fan, and the 3S coupler, the driving motor and the back pressure steam turbine are required to be in a locking engagement state before the driving motor is started. Thus, after the driving motor is started, the driving force of the driving motor is transmitted to the boiler fan through the 3S coupler and the rotor of the back pressure turbine, although the rotor of the back pressure turbine is in a rotating state and is actually rotated passively, and at the moment, the back pressure turbine is not started. Before the driving motor is started or the back pressure turbine is started, the 3S coupler can be manually locked and meshed with the driving motor and the back pressure turbine or disengaged from the driving motor and the back pressure turbine.
In specific implementation, the method provided by the application can further comprise the following steps:
in the running process of the boiler fan, if the double-drive control device determines that the boiler fan is currently driven by the driving motor independently, detecting whether the back pressure steam turbine has input driving steam or not;
If yes, the double-drive control device starts the back pressure steam turbine, and when the rotor rotating speed of the back pressure steam turbine is larger than the preset working rotating speed, the driving motor is controlled to stop, so that the driving motor is disengaged with the back pressure steam turbine through the 3S coupler, and the back pressure steam turbine independently drives the boiler fan.
That is, if the boiler fan is driven by the driving motor alone during the operation of the boiler fan, the dual-drive control device can also detect whether the driving steam is input into the back pressure turbine in real time or at intervals, and if not, the driving motor is still required to provide the driving force. If the driving steam is detected to be input into the back pressure steam turbine, the back pressure steam turbine can generate driving force, and the double-drive control device starts the back pressure steam turbine. After the back pressure steam turbine is started, if the back pressure steam turbine can provide enough driving force, the driving motor is not needed any more, the driving motor is controlled to stop at the moment, after the driving motor stops, the driving motor is disengaged with the back pressure steam turbine through the 3S coupler due to the speed reduction of the second driving shaft, and the back pressure steam turbine is used for independently driving the boiler fan.
Of course, if the back pressure turbine does not provide a sufficient driving force although the driving steam is inputted thereto, the boiler fan may be driven by the driving motor together with the back pressure turbine.
In specific implementation, the method provided by the application can further comprise the following steps:
In the running process of the boiler fan, if the double-drive control device determines that the boiler fan is currently driven by the driving motor and the back pressure steam turbine together, and detects that the input driving steam quantity of the back pressure steam turbine is reduced to 0, the double-drive control device controls the back pressure steam turbine to stop so that the boiler fan is driven by the driving motor alone.
That is, if the boiler blower is currently driven by the driving motor and the back pressure turbine together, it is explained that the driving force provided by the back pressure turbine is insufficient at this time, the amount of steam input into the back pressure turbine is insufficient, and when the amount of input driving steam of the back pressure turbine is reduced to 0, the back pressure turbine has failed to provide the driving force, at which time the back pressure turbine can be controlled to stop, i.e., at which time the boiler blower is driven by the driving motor alone.
In a specific implementation, when the boiler fan stops running, if the boiler fan is currently driven by the driving motor alone, the driving motor can be stopped at this time. If the boiler blower is currently driven solely by the back pressure turbine, the back pressure turbine may be stopped at this time.
Of course, if the boiler fan is currently driven by the driving motor and the back pressure steam turbine together, the double-drive control device controls the driving motor to stop at the moment, and after the driving motor stops, the driving motor is disengaged from the back pressure steam turbine through the 3S coupling. After the driving motor is stopped, the double-drive control device controls the back pressure steam turbine to stop.
In a specific implementation, if the dual-drive control device further comprises a first driving shaft, a second driving shaft, a third driving shaft, a first speed measuring probe and a second speed measuring probe, the dual-drive control device can acquire a first rotating speed of the first driving shaft through the first speed measuring probe, and the first rotating speed is a rotor rotating speed of the back pressure steam turbine; the double-drive control device can acquire a second rotating speed of the second driving shaft through the second speed measuring probe, wherein the second rotating speed is the rotating speed of the rotor of the driving motor.
According to the boiler fan double-driving control method based on the 3S coupler, as the system comprises the driving motor and the back pressure turbine, the back pressure turbine can drive the boiler fan by utilizing the steam heat with rich heat source, so that the waste of steam energy can be reduced. When the rotor rotating speed of the back pressure turbine is smaller than the preset working rotating speed, namely, the back pressure turbine cannot provide enough driving force, the motor is started, and the driving motor is locked and meshed with the back pressure turbine through the 3S coupler, so that the boiler fan is driven by the driving motor and the back pressure turbine together, and the normal operation of the boiler fan is ensured. Moreover, due to the back pressure steam turbine, the high-temperature and high-pressure steam can be converted into the steam meeting the pressure and temperature required by the heat user.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (8)
1. Boiler fan dual drive control system based on 3S shaft coupling, characterized in that includes: the device comprises a driving motor, a 3S coupler, a back pressure steam turbine and a double-drive control device;
The driving motor is connected with the 3S coupler, the 3S coupler is connected with the back pressure steam turbine, and the back pressure steam turbine is connected with the boiler fan to be driven; the double-drive control device is respectively connected with the driving motor, the back pressure steam turbine and the boiler fan;
The double-drive control device is used for acquiring the rotor rotating speed of the back pressure steam turbine if the boiler fan is independently driven by the back pressure steam turbine in the operation process of the boiler fan, controlling the driving motor to start if the rotor rotating speed is smaller than a preset working rotating speed, and controlling the rotor rotating speed of the driving motor to be larger than the preset working rotating speed so that the driving motor is in locking engagement with the back pressure steam turbine through the 3S coupling, and jointly driving the boiler fan by the driving motor and the back pressure steam turbine;
The double-drive control device is also used for controlling the back pressure steam turbine to continuously and independently drive the boiler fan if the rotor rotating speed of the driving motor is greater than or equal to the preset working rotating speed;
The system further comprises: the device comprises a first driving shaft, a second driving shaft, a third driving shaft, a first speed measuring probe and a second speed measuring probe; the 3S coupler is connected with the back pressure turbine through the first driving shaft, the driving motor is connected with the 3S coupler through the second driving shaft, and the back pressure turbine is connected with the boiler fan through the third driving shaft; the first speed measuring probe is arranged on the first driving shaft, the second speed measuring probe is arranged on the second driving shaft, and the first speed measuring probe and the second speed measuring probe are connected to the double-drive control device.
2. The system of claim 1, wherein the first tachometer probe or the second tachometer probe is a key phase pulse tachometer probe, a light reflecting pulse tachometer probe, or a multi-tooth pulse tachometer probe.
3. The system of claim 1, wherein the dual drive control is an in-situ programmable logic control, a remote sequential control, or a decentralized control.
4. The system of claim 1, wherein the boiler fan is a fan, a draft fan, or a primary fan of a boiler; the boiler is a drum type boiler, a straight-flow type boiler, a high-pressure boiler, a subcritical unit boiler, a super-machine unit boiler, a pulverized coal boiler or a circulating fluidized bed boiler.
5. A double-drive control method of a boiler fan based on a 3S coupling, which is characterized in that the double-drive control method is realized based on the double-drive control system provided in claim 1; the method comprises the following steps:
In the running process of the boiler fan, if the double-drive control device determines that the boiler fan is currently driven by the back pressure steam turbine independently, acquiring the rotor rotating speed of the back pressure steam turbine, and judging whether the rotor rotating speed is smaller than a preset working rotating speed or not;
If yes, the double-drive control device controls the driving motor to start, and controls the rotor rotating speed of the driving motor to be larger than the preset working rotating speed, so that the driving motor is in locking engagement with the back pressure turbine through the 3S coupler, and the driving motor and the back pressure turbine jointly drive the boiler fan.
6. The method of claim 5, wherein the method further comprises:
and if the rotor rotating speed of the driving motor is greater than or equal to the preset working rotating speed, the double-drive control device controls the back pressure steam turbine to continuously and independently drive the boiler fan.
7. The method of claim 5, wherein the method further comprises:
when the boiler fan is started, the double-drive control device judges whether the back pressure steam turbine has input drive steam or not;
if yes, the driving motor is disengaged from the back pressure steam turbine through the 3S coupler, and the back pressure steam turbine is started, so that the back pressure steam turbine drives the boiler fan;
if not, the driving motor is locked and meshed with the back pressure steam turbine through the 3S coupler, and the double-drive control device starts the driving motor so that the driving motor drives the boiler fan.
8. The method of claim 7, wherein the method further comprises:
in the running process of the boiler fan, if the double-drive control device determines that the boiler fan is currently driven by the driving motor independently, detecting whether the back pressure steam turbine has input driving steam or not;
If yes, the double-drive control device starts the back pressure steam turbine, and when the rotor rotating speed of the back pressure steam turbine is larger than the preset working rotating speed, the driving motor is controlled to stop, so that the driving motor is disengaged with the back pressure steam turbine through the 3S coupler, and the back pressure steam turbine independently drives the boiler fan.
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