CN204677464U - Electric Factory Air-Cooling Island axial-flow blower servo power system - Google Patents
Electric Factory Air-Cooling Island axial-flow blower servo power system Download PDFInfo
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- CN204677464U CN204677464U CN201520232735.7U CN201520232735U CN204677464U CN 204677464 U CN204677464 U CN 204677464U CN 201520232735 U CN201520232735 U CN 201520232735U CN 204677464 U CN204677464 U CN 204677464U
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Abstract
The utility model discloses Electric Factory Air-Cooling Island axial-flow blower servo power system, comprise servo driver, actuating motor, temperature and back pressure monitoring modular, servo driver is electrically connected with actuating motor, temperature and back pressure monitoring modular respectively, and actuating motor is directly connected with axial-flow blower; After temperature and back pressure monitoring modular convert monitored motor temperature and steam back pressure signal to voltage signal, export servo driver to.Actuating motor is used for substituting former asynchronous motor and transmission device, Direct driver load operation, in the closed loop control that whole axial-flow blower is in without transmission device, and the control accuracy of actuating motor is high, improve the speed of response of blower fan, at utmost improve working efficiency and the stability of power plant system.
Description
Technical field
The utility model relates to Electric Factory Air-Cooling Island axial-flow blower control technique, is specifically related to Electric Factory Air-Cooling Island axial-flow blower servo power system.
Background technique
The exhaust steam (i.e. steam) that Steam Turbine in Fire Power Plant acting is discharged needs to carry out cooling becomes water of condensation, forms complete thermodynamic cycle.The exhaust steam cooling technology in thermal power plant is mainly divided into two large classes, i.e. water cooling and Air flow (abbreviation air cooling), specifically takes which kind of mode to depend on the requirement of the addressing of power plant, local climate condition, unit feature and society and environmental protection.Adopt fin tube type air cooling heat radiator, directly carry out the cooling system of condensing turbine steam discharge with ambient air, be called direct air cooling system; Adopt the Turbo-generator Set of air cooling system referred to as Air-cooled Unit.
In direct air cooling system, axial-flow blower generally runs with fixing rotating speed, air is driven to flow through radiator outer surface, make exhaust steam be condensed into water and enter hot well, the heat regenerative system of steam turbine is sent into again through condensate pump, impel between air and steam discharge and carry out heat exchange, thus make air directly cool the steam discharge of steam turbine.
The primary drive device of axial-flow blower is gear reduction box.The bearing on speed reducer top is by an oil pump lubrication, and this oil pump is stressed switch protection.Pressure switch, for detecting oil lubrication fault, is arranged in lubricant pipe.Also being configured with one above speed reducer for controlling the oil outer gauge of pasta, easily arriving this oil outer gauge from maintenance platform.The design of speed reducer and bearing thereof considers continuous unbalanced force and radius revolution motion unbalanced force, but rate of fault is high, shutdown maintenance of often having to.
In addition, axial-flow blower adopts additional starting electrical machinery impacting start or soft starting device to start usually, impacts large to electrical network, and torque reduction required when having started rear running, so there is very large space in energy saving.At present, axial-flow blower power system generally adopts three-phase AC asynchronous motor as power source, realizes the start and stop of blower fan, transmission and speeds control by devices such as hydraulic couplers, speed-changing gear box and belt reducers.The theory diagram of this axial-flow blower power system has been shown in Fig. 1.But the power system of these conventional fan, all adopts threephase asynchronous machine, efficiency is not high.Because the rated speed of asynchronous motor is not mated with needed for reality with nominal torque, thus must be equipped with hydraulic couplers and speed-changing gear box as transmission and speed change gear, cause transmission energy loss.Because technique rotating speed keeps constant, electricity is caused to be wasted.For this type of situation, many producers are equipped with low voltage frequency converter, and for output rotating speed regulation, but asynchronous motor Maximum Torque is limited, must by hydraulic couplers and speed-changing gear box during start, transmission device frequency of maintenance cannot be solved high and cause the problem of power plant system instability.
Model utility content
The utility model is in order to solve the technical problem existing for prior art, Electric Factory Air-Cooling Island axial-flow blower servo power system is provided, the load operation of actuating motor Direct driver, in the closed loop control that whole axial-flow blower is in without transmission device, and the control accuracy of actuating motor is high, improve the speed of response of blower fan, at utmost improve working efficiency and the stability of power plant system.
In order to solve the problems of the technologies described above, the utility model adopts following technological scheme: Electric Factory Air-Cooling Island axial-flow blower servo power system, comprise servo driver, actuating motor, temperature and back pressure monitoring modular, servo driver is electrically connected with actuating motor, temperature and back pressure monitoring modular respectively, and actuating motor is directly connected with axial-flow blower; After temperature and back pressure monitoring modular convert monitored motor temperature and steam back pressure signal to voltage signal, export servo driver to.
Preferably, described temperature and back pressure monitoring modular comprise temperature transducer and back pressure sensor; Temperature transducer is arranged on actuating motor, and is electrically connected with servo driver; Back pressure sensor is arranged in exhaust steam pipeline, and is electrically connected with servo driver.
Preferably, described servo driver comprises the PID arithmetic module and I/O module that are connected, and PID arithmetic module is connected with actuating motor, and I/O module is connected with temperature and back pressure monitoring modular.
Preferably, described actuating motor is permagnetic synchronous motor.The rotor base-plates surface of permagnetic synchronous motor is provided with a groove, and permanent magnet is embedded in described groove.Described groove is cast in rotor base-plates surface.
As can be seen from technique scheme, the utility model compared with prior art, has following beneficial effect:
1, the utility model is the energy-efficient drive system of Electric Factory Air-Cooling Island axial-flow blower design specially, and actuating motor possesses good starting characteristic, high overload multiple, can cover the characteristic requirements of Air-Cooling Island blower fan; Because the signal of servo driver by monitoring modular collection converts, and then control the load operation of actuating motor Direct driver, make whole blower fan be in one and decrease transmission loss without in the closed loop control of transmission device, reduce the maintenance cost of blower fan.
2, actuating motor is permagnetic synchronous motor, precision is high, rotating speed controls steadily, improve blower fan speed of response, the own efficiency of electric system is improved about 10%, output speed can be provided according to actual demand, avoid unnecessary operating mode waste, at utmost improve fractional energy savings and the stability of a system.
3, permagnetic synchronous motor adopts embedded rotor, and be embedded into by permanent magnet in the groove being arranged on rotor base-plates surface, relative to traditional salient mounting formula rotor, embedded rotor is more durable; Relative to traditional built-in type rotor, embedded rotor is more conducive to heat radiation, and improves the resolution of ensorless control, enhances the anti-demagnetization capability of motor.
Accompanying drawing explanation
Fig. 1 is Electric Factory Air-Cooling Island axial-flow blower power system principle block diagram in prior art;
Fig. 2 is the theory diagram of the utility model Electric Factory Air-Cooling Island axial-flow blower servo power system;
Fig. 3 (a), (b) and (c) are the structural representation of salient mounting formula, built-in type and embedded permagnetic synchronous motor respectively.
Embodiment
Below in conjunction with embodiment and Figure of description, clear, complete description is carried out to the utility model embodiment; Described embodiment is only that the utility model part implements mode of execution; embodiment of the present utility model is not limited to this; those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, drop in protection domain of the present utility model.
Embodiment
See Fig. 2, in the present embodiment, Electric Factory Air-Cooling Island axial-flow blower servo power system comprises: servo driver, actuating motor, temperature and back pressure monitoring modular, servo driver is connected with actuating motor, temperature and back pressure monitoring modular respectively, and actuating motor is directly connected with load (i.e. axial-flow blower).Temperature and back pressure monitoring modular comprise temperature transducer and back pressure sensor; Temperature transducer is arranged on actuating motor, and is electrically connected with servo driver; Back pressure sensor is installed in exhaust steam pipeline, and is electrically connected with servo driver.Described exhaust steam pipeline not in electric system, but on former process steam pipeline, namely installs back pressure sensor on original process steam pipeline, is used for measuring the pressure of steam.Motor drives blower fan, is for the cooling of steam is served.After temperature transducer and back pressure sensor convert monitored motor temperature and steam back pressure signal to voltage signal, export servo driver to.
Servo driver comprises the PID arithmetic module and I/O module that are connected, and PID arithmetic module is connected with actuating motor, and I/O module is connected with temperature and back pressure monitoring modular.Servo driver receives the motor temperature, the steam back pressure signal that export from temperature and back pressure monitoring modular, by the motion speed of the detection analysis and regulation actuating motor to back pressure signal, changes wind speed, while guarantee cooling effect, realize energy saving of system; Motor temperature is monitored, prevents electromotor high-temperature from burning.
Actuating motor adopts permagnetic synchronous motor, for the asynchronous motor in alternative original axial-flow blower power system and transmission device, and Direct driver axial-flow blower, thus the hydraulic couplers eliminated in existing axial-flow blower power system and gearbox, reduce power transfer loss.In the present embodiment, the rotor of permagnetic synchronous motor adopts embedded rotor, and rotor comprises permanent magnet and pedestal, is embedded into by permanent magnet in the groove being arranged on rotor pedestal, as shown in Fig. 3 (c); Relative to traditional salient mounting formula and built-in type rotor shown in Fig. 3 (a) and (b), embedded rotor is not only durable but also be conducive to heat radiation, and improve the resolution of ensorless control, enhance the anti-demagnetization capability of motor, utilize magnetic resistance of motor torque simultaneously, motor can be made to export maximum moment of torsion with minimum electric current.Salient mounting formula is also known as surface-mount type, and be that the special glue of permanent magnet is bonded on rotor pedestal, the obvious life-span is not long, not firmly.Built-in type refers to and permanent magnet is embedded in inside rotor pedestal, although firmly, dispels the heat bad.And that the present embodiment adopts is embedded, be cast out a groove at rotor base-plates surface, permanent magnet is embedded in described groove, thermal diffusivity and stability are all solved.Wherein, the formation method of described groove is very flexible, as long as can set aside concerns permanent magnet, is generally surface groove being cast in pedestal, also can uses special finishing at the very start.
The utility model makes whole axial fan system be in a vector control system, and all blower fans control by servo driver, carries out regulating or start and stop between minimum speed and maximum speed with stepless gearing method.Actual measurement back pressure signal after process and setting value compare by the PID arithmetic module of servo driver, thus change the rotating speed of blower fan, the flow of cooling-air is coordinated mutually with operating conditions (as steam load and atmospheric temperature), steam turbine exhaust pressure is kept constant, namely maintains setting value.When actual measurement back pressure signal is higher than setting value, then improves the rotating speed that running blower fan or start more blower fan, when actual measurement back pressure signal is lower than setting value, then reducing the rotating speed or stall part fan that are running blower fan.In general, blower fan maximum speed is 55Hz (110%), and minimum speed is 0-12.5Hz (0%-25%), and under the control of servo driver, blower fan changes between minimum speed and maximum speed.Because synchronous machine has the feature of low-speed big, can Direct driver blower fan, save the transmission loss of transmission device, improve transmission efficiency, stopped the problem that transmission device causes whole system to stop as faults such as ripple case leakage of oils.
The mode of execution of above embodiment to axial-flow blower servo power system provided by the utility model is described in detail; but protection domain of the present utility model is not limited to above-described embodiment; for those of ordinary skill in the art; the applicability adjustment done according to content disclosed in the utility model, all in protection domain of the present utility model.
Claims (6)
1. Electric Factory Air-Cooling Island axial-flow blower servo power system, it is characterized in that, comprise servo driver, actuating motor, temperature and back pressure monitoring modular, servo driver is electrically connected with actuating motor, temperature and back pressure monitoring modular respectively, and actuating motor is directly connected with axial-flow blower; After temperature and back pressure monitoring modular convert monitored motor temperature and steam back pressure signal to voltage signal, export servo driver to.
2. servo power system according to claim 1, is characterized in that, described temperature and back pressure monitoring modular comprise temperature transducer and back pressure sensor; Temperature transducer is arranged on actuating motor, and is electrically connected with servo driver; Back pressure sensor is arranged in exhaust steam pipeline, and is electrically connected with servo driver.
3. servo power system according to claim 1, is characterized in that, described servo driver comprises the PID arithmetic module and I/O module that are connected, and PID arithmetic module is connected with actuating motor, and I/O module is connected with temperature and back pressure monitoring modular.
4. servo power system according to claim 1, is characterized in that, described actuating motor is permagnetic synchronous motor.
5. servo power system according to claim 4, is characterized in that, the rotor base-plates surface of described permagnetic synchronous motor is provided with a groove, and permanent magnet is embedded in described groove.
6. servo power system according to claim 5, is characterized in that, described groove is cast in rotor base-plates surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520232735.7U CN204677464U (en) | 2015-04-16 | 2015-04-16 | Electric Factory Air-Cooling Island axial-flow blower servo power system |
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| CN201520232735.7U CN204677464U (en) | 2015-04-16 | 2015-04-16 | Electric Factory Air-Cooling Island axial-flow blower servo power system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131172A (en) * | 2017-12-20 | 2018-06-08 | 赵连新 | A kind of turbine operating efficiency self-checking device and adjusting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131172A (en) * | 2017-12-20 | 2018-06-08 | 赵连新 | A kind of turbine operating efficiency self-checking device and adjusting method |
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