CN215719713U - Boiler fan dual-drive system based on 3S coupler - Google Patents
Boiler fan dual-drive system based on 3S coupler Download PDFInfo
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- CN215719713U CN215719713U CN202120752829.2U CN202120752829U CN215719713U CN 215719713 U CN215719713 U CN 215719713U CN 202120752829 U CN202120752829 U CN 202120752829U CN 215719713 U CN215719713 U CN 215719713U
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Abstract
The application relates to a boiler fan dual-drive system based on a 3S coupler, which comprises a drive motor, the 3S coupler and a back pressure turbine; the driving motor is connected with the 3S coupler, the 3S coupler is connected with the back pressure turbine, and the back pressure turbine is connected with a boiler fan to be driven. The back pressure turbine drives the boiler fan by using the steam heat with rich heat supply sources, so that the waste of steam energy can be reduced. When the back pressure turbine can not provide enough driving force, the driving motor and the back pressure turbine drive the boiler fan together 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 system based on a 3S coupler.
Background
Under the great trend of energy conservation and emission reduction, the recovery of abundant energy of industrial heat supply and abundant energy of heat supply of a thermal power plant is imperative, at present, the industrial heat supply and the thermal power plant generally supply heat, but because the heat supply heat source and a heat user have the mismatch problem and the reliability requirement of heat supply, the generally existing heat supply pressure is higher than the requirement of the heat user, and therefore a 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 requirement is more than 100t/h, and the conventional plant steam grade of the existing thermal power plant is more than 0.8-1.0MPa, so that the existing power plant thermodynamic system cannot provide an effective and proper steam source when the industrial users need the existing power plant to provide steam for heating. At present, the common method is as follows: directly connecting a temperature and pressure reducing device from an outlet of high-temperature and high-pressure steam (the pressure is 12MPa and the temperature is more than 540 ℃) of the boiler to supply heat to a user; another common practice is: the steam is led out through the high-pressure cylinder exhaust steam (about 2.8-3.8MPa of pressure and 330 ℃) or the medium-pressure cylinder intake steam (about 2.8-3.8MPa of pressure and 530 ℃) of the steam turbine generator unit, and then is supplied to industrial users through a temperature and pressure reducer. Because the two methods cause larger steam supply pressure loss due to the use of the temperature and pressure reducing device, the huge waste of steam energy is caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem or at least partially solve the technical problem, the application provides a 3S coupling-based boiler fan dual-drive system.
The application provides a boiler fan dual drive system based on 3S shaft coupling includes: the system comprises a driving motor, a 3S coupler and a back pressure turbine; the driving motor is connected with the 3S coupler, the 3S coupler is connected with the back pressure turbine, and the back pressure turbine is connected with a boiler fan to be driven;
in the operation process of the boiler fan, if the boiler fan is currently driven by the back pressure turbine alone, and the rotor rotating speed of the back pressure turbine is smaller than the preset working rotating speed, the driving motor is started, and the rotor rotating speed of the driving motor is controlled 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 drive the boiler fan together.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a 3S coupling-based boiler fan dual-drive system provided by the present application;
reference numerals: 1-driving a motor; 2-3S coupling; 3-back pressure turbine; 4 a-an air outlet pipeline of a boiler fan; 4 b-an air inlet pipeline of a boiler fan; 5-boiler fan; 6-steam inlet pipeline of back pressure turbine; 7-heat supply pipeline of back pressure turbine; 8-a second drive shaft; 9-a first drive shaft; 10-third drive shaft.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In a first aspect, the present application provides a 3S coupling-based dual-drive system for a boiler blower, as shown in fig. 1, the system includes: driving motors 1, 3S coupling 2 and back pressure turbine 3. The driving motor 1 is connected with the 3S coupler 2, the 3S coupler 2 is connected with the back pressure turbine 3, and the back pressure turbine 3 is connected with the boiler fan 5 to be driven.
The dynamic working process of the system comprises the following steps: in the operation process of the boiler fan 5, if the boiler fan 5 is currently driven by the back pressure turbine 3 alone, and the rotor speed of the back pressure turbine 3 is less than the preset working speed, the driving motor 1 is started, and the rotor speed of the driving motor 1 is controlled to be greater than the preset working speed, so that the driving motor 1 passes through the 3S coupler 2 and the back pressure turbine 3 are locked and meshed, and the driving motor 1 and the back pressure turbine 3 drive the boiler fan 5 together.
It will be appreciated that the boiler fan 5 may be a blower, an induced draft fan or a primary fan of a boiler, and may be any blower, induced draft fan or primary fan for industrial use.
It will be appreciated that the boiler driven by the boiler fan 5 may be any type of industrial boiler, including any type of power plant boiler. Such as a drum boiler, a once-through boiler, a high pressure boiler, a subcritical unit boiler, a supercritical unit boiler, a pulverized coal furnace or a circulating fluidized bed boiler.
It will be appreciated that the air in the inlet duct 4b of the boiler fan 5 can come from any place and location of the power plant, both inside and outside the furnace, high or low. The outlet duct 4a of the boiler fan 5 can be connected to a power plant boiler.
It can be understood that the back pressure turbine 3 is a turbine with a steam discharge pressure greater than atmospheric pressure, the design value of the steam discharge pressure of the back pressure turbine 3 depends on different heat supply purposes, and the back pressure turbine 3 can convert the input high-temperature and high-pressure steam into steam with the pressure and temperature required by the heat consumer.
It can be understood that the input of the back pressure turbine 3 drives the steam to enter from its steam inlet duct 6, the input driving steam being a high pressure heating steam source, which may come from the main steam source of the steam turbine generator unit of the power plant; the steam can also come from a reheat steam source, and particularly comprises a cold section of reheat steam and a hot section of reheat steam; it can also be industrial steam or heating steam from any application. The exhaust steam of the back pressure turbine 3 is discharged through the heat supply pipeline 7, and the discharged steam can be any industrial heat supply, civil heat supply, heat supply of any pressure and temperature grade and the like.
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 are connected by the 3S coupling 2 between the two drives. When the driving motor 1 and the back pressure turbine 3 are locked and meshed through the 3S coupler 2, the boiler fan 5 can be driven by the driving motor 1 and the back pressure turbine 3 together or 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 to rotate by the driving motor 1. When the driving motor 1 and the back pressure turbine 3 are driven together, the driving motor 1 provides a part of power, and the back pressure turbine 3 provides a part of power, so that the rotating speed of the boiler fan 5 can meet the working requirement.
It can be understood that, if the back pressure turbine 3 is driven alone when the boiler fan 5 starts to operate, the amount of the 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 at this time, the rotational speed of the rotor of the back pressure turbine 3 also gradually decreases. If the rotating speed of the rotor of the back pressure turbine 3 is reduced to be less than the preset working rotating speed, the rotating speed of the boiler fan 5 cannot reach the working requirement by the power provided by the back pressure turbine 3, and the driving motor 1 and the back pressure turbine 3 need to drive together at the moment.
Of course, if the rotor speed of the back pressure turbine 3 is always greater than the preset operating speed, it may always be driven by the back pressure turbine 3 alone. That is, if the rotational speed of the rotor of the driving motor 1 is greater than or equal to the preset operating rotational speed, the back pressure turbine 3 continues to drive the boiler fan 5 alone.
In a specific implementation, the dual drive system may further include: a first drive shaft 9, a second drive shaft 8, a third drive shaft 10. The 3S coupling 2 is connected with the back pressure turbine 3 through the first driving shaft 9, the driving motor 1 is connected with the 3S coupling 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.
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. When the 3S coupling 2 disengages the two shafts, the back pressure turbine 3 and the drive motor 1 are disengaged.
In this way, the rotor speed of the back pressure turbine 3 can be known by detecting the first speed of the first drive shaft 9, and the rotor speed of the drive motor 1 can also be obtained by detecting the second speed of the second drive shaft 8.
The 3S coupling 2, i.e., the SSS coupling (synchronous-Self-Shifting coupling), is a clutch coupling that can be disengaged or coupled between two shafts at full-speed operation. When the rotating 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 rotating speed of the driving shaft at the input side is lower than that of the driving shaft at the output side, the 3S coupling 2 is disengaged from the two driving shafts. For example, when the boiler fan 5 is driven by the drive motor 1 and the back pressure turbine 3 together, the second drive shaft 8 is the input side drive shaft, and the first drive shaft 9 is the output side drive shaft, and at this time, when the rotation speed of the second drive shaft 8 is smaller than that of the first drive shaft 9, the 3S coupling 2 disengages the two drive shafts.
In specific implementation, a detection control device can be further arranged to know whether the rotor rotating speed of the back pressure turbine, the rotor rotating speed of the driving motor and the boiler fan input driving steam or not, and to realize start-stop control and the like of the back pressure turbine and the driving motor. The detection control device may adopt various structural forms for realizing the above functions, which are not illustrated here.
The application provides a boiler fan dual drive system based on 3S shaft coupling because including two kinds of drive arrangement of driving motor 1 and back pressure turbine 3 in the system, back pressure turbine 3 can utilize the steam heat that the heat supply heat source is abundant to drive boiler fan 5, consequently can reduce the waste of steam energy. When the rotor speed of the back pressure turbine 3 is less than the preset working speed, that is, when the back pressure turbine 3 cannot provide enough driving force, the motor is started, so that the driving motor 1 is locked and meshed with the back pressure turbine 3 through the 3S coupler 2, and the boiler fan 5 is driven by the driving motor 1 and the back pressure turbine 3 together, so that the normal operation of the boiler fan 5 is ensured. Moreover, since the back pressure turbine 3 is used, the high-temperature and high-pressure steam can be converted into steam in accordance with the pressure and temperature required by the hot user.
In a second aspect, the utility model provides a 3S-coupling-based boiler fan dual-drive method, which is implemented based on the dual-drive system provided in the first aspect, and the method includes:
in the operation process of the boiler fan, if the boiler fan is currently driven by the back pressure turbine alone, the rotor rotating speed of the back pressure turbine is obtained, and whether the rotor rotating speed is smaller than a preset working rotating speed is judged;
if so, starting the driving motor, and controlling the rotor rotating speed of the driving motor to be greater than the preset working rotating speed so as to enable the driving motor to be 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 can be understood that, in the operation process of the boiler fan, if the boiler fan is currently driven by the back pressure turbine alone, that is, the driving motor is in a stop state at this time, and the driving motor is in a disengaged state with the back pressure turbine through the 3S coupling.
It can be understood that, as the amount of the input driving steam of the back pressure turbine may be gradually reduced along with the time, the driving force that the back pressure turbine can provide is also reduced, so that the rotation speed of the back pressure turbine can be obtained in real time or at intervals, if the rotation speed of the rotor of the back pressure turbine is reduced to be less than the preset working rotation speed, it is indicated that the driving force of the back pressure turbine is not enough to drive the boiler fan, at this time, the driving motor needs to be started, when the rotation speed of the rotor of the driving motor is increased to be the same as the rotation speed of the rotor of the back pressure turbine, the 3S coupler is respectively locked and meshed with the driving motor and the back pressure turbine, at this time, the driving motor enters a locked and meshed state with the back pressure turbine through the 3S coupler, the rotation speed of the rotor of the driving motor still needs to be continuously increased until the rotation speed is higher than the preset working rotation speed, so as to meet the normal working requirement of the boiler fan, at the moment, the boiler fan is driven by the driving motor and the back pressure turbine together.
Of course, if the rotor rotating speed of the back pressure turbine is greater than or equal to the preset working rotating speed, only the back pressure turbine is required to be driven at the moment, and therefore the boiler fan is continuously and independently driven by the back pressure turbine.
It will be appreciated that the above process is a treatment method during operation of the boiler fan.
In specific implementation, the method provided by the present application may further include the following steps:
when the boiler fan is started, judging whether the back pressure turbine has input driving steam or not;
if so, the driving motor is disengaged from the back pressure turbine through the 3S coupler, and the back pressure turbine is started so as to drive the boiler fan by the back pressure turbine;
if not, the driving motor is locked and meshed with the back pressure turbine through the 3S coupler, and the driving motor is started so as to drive the boiler fan.
That is, when the boiler fan is just started, it is necessary to determine whether or not the drive steam is input to the back pressure turbine, and if so, the back pressure turbine provides the drive force, and at this time, the 3S coupling is disengaged from the drive motor and the back pressure turbine. And if no drive steam is input into the back pressure turbine, the back pressure turbine cannot provide drive force, the drive motor needs to be started at the moment, the drive force is provided by the drive motor alone, and the 3S coupler, the drive motor and the back pressure turbine need to be in a locking and meshing state before the drive motor is started in order to ensure that the drive force of the drive motor can be transmitted to the boiler fan. 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 actually rotates passively, the back pressure turbine is not started at the moment. Before the driving motor is started or the back pressure turbine is started, the 3S coupling can be locked and meshed with or disengaged from the driving motor and the back pressure turbine manually.
In specific implementation, the method provided by the present application may further include:
in the operation process of the boiler fan, if the boiler fan is driven by the driving motor alone at present, judging whether the back pressure turbine has input driving steam;
if so, starting the back pressure turbine, and stopping the driving motor when the rotor rotating speed of the back pressure turbine is greater than the preset working rotating speed, so that the driving motor is disengaged from the back pressure turbine through the 3S coupler, and the back pressure turbine drives the boiler fan independently.
That is, if the boiler fan is driven by the driving motor alone during the operation of the boiler fan, it is possible to detect whether the driving steam is input into the back pressure turbine in real time or intermittently, and if not, the driving motor is still required to provide the driving force. If the driving steam is input into the back pressure turbine, the back pressure turbine can also generate the driving force, and the back pressure turbine is started. After the back pressure turbine is started, if the back pressure 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 speed of the second driving shaft is reduced, so that the driving motor is disengaged from the back pressure turbine through the 3S coupler, and the back pressure turbine drives the boiler fan independently.
Of course, if the back pressure turbine cannot provide a sufficient driving force although 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 present application may further include:
in the operation process of the boiler fan, if the boiler fan is currently driven by the driving motor and the back pressure turbine together, and the amount of input driving steam of the back pressure turbine is reduced to 0, the back pressure turbine is stopped, so that the boiler fan is driven by the driving motor alone.
That is, if the boiler fan is currently driven by both the driving motor and the back pressure turbine, it is indicated that the back pressure turbine provides insufficient driving force 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 cannot provide driving force, and at this time, the back pressure turbine may be controlled to stop, that is, the boiler fan is driven by the driving motor alone at this time.
In specific implementation, when the boiler fan stops operating, if the boiler fan is currently driven by the driving motor alone, the driving motor can be stopped at the moment. If the boiler fan is currently being driven by the back pressure turbine alone, the back pressure turbine may be stopped at this point.
Of course, if the boiler fan is currently driven by the driving motor and the back pressure turbine together, the driving motor is stopped at this moment, and after the driving motor is stopped, the driving motor can be disengaged from the back pressure turbine through the 3S coupler. After the driving motor is stopped, the back pressure turbine may be stopped.
In specific implementation, if the dual-drive control device further comprises a first driving shaft, a second driving shaft and a third driving shaft, a first rotating speed of the first driving shaft can be obtained, wherein the first rotating speed is the rotating speed of a rotor of the back pressure turbine; a second rotational speed of the second drive shaft, which is a rotational speed of a rotor of the drive motor, may be acquired.
The application provides a boiler fan dual drive method based on 3S shaft coupling because including two kinds of drive arrangement of driving motor and back pressure turbine in the system, back pressure turbine can utilize the abundant steam heat of heat supply heat source to drive the boiler fan, consequently can reduce the waste of steam energy. When the rotor speed of the back pressure turbine is less than the preset working speed, namely the back pressure turbine can not provide enough driving force, the motor is started, the driving motor is in locking engagement with the back pressure turbine through the 3S coupler, and therefore the boiler fan is driven by the driving motor and the back pressure turbine together, and normal operation of the boiler fan is guaranteed. Moreover, because the back pressure turbine is adopted, high-temperature and high-pressure steam can be converted into steam which meets the pressure and temperature required by a hot 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (4)
1. The utility model provides a boiler fan dual drive system based on 3S shaft coupling which characterized in that includes: the system comprises a driving motor, a 3S coupler and a back pressure turbine; the driving motor is connected with the 3S coupler, the 3S coupler is connected with the back pressure turbine, and the back pressure turbine is connected with a boiler fan to be driven;
in the operation process of the boiler fan, if the boiler fan is currently driven by the back pressure turbine alone, and the rotor rotating speed of the back pressure turbine is smaller than the preset working rotating speed, the driving motor is started, and the rotor rotating speed of the driving motor is controlled 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 drive the boiler fan together.
2. The system of claim 1, further comprising: the back pressure type steam turbine comprises a first driving shaft, a second driving shaft and a third driving shaft, wherein the 3S coupler is connected with the back pressure type steam turbine through the first driving shaft, the driving motor is connected with the 3S coupler through the second driving shaft, and the back pressure type steam turbine is connected with the boiler fan through the third driving shaft.
3. The system of claim 1, wherein the boiler fan is a blower, an induced draft fan, or a primary fan of a boiler.
4. The system of claim 3, wherein the boiler is a drum boiler, a once-through boiler, a high pressure boiler, a subcritical block boiler, a supercritical block boiler, a pulverized coal furnace, or a circulating fluidized bed boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120752829.2U CN215719713U (en) | 2021-04-13 | 2021-04-13 | Boiler fan dual-drive system based on 3S coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120752829.2U CN215719713U (en) | 2021-04-13 | 2021-04-13 | Boiler fan dual-drive system based on 3S coupler |
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| Publication Number | Publication Date |
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| CN215719713U true CN215719713U (en) | 2022-02-01 |
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| CN202120752829.2U Active CN215719713U (en) | 2021-04-13 | 2021-04-13 | Boiler fan dual-drive system based on 3S coupler |
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