CN204190594U - Generating set condensate pump permanent magnet speed regulation device - Google Patents
Generating set condensate pump permanent magnet speed regulation device Download PDFInfo
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- CN204190594U CN204190594U CN201420593761.8U CN201420593761U CN204190594U CN 204190594 U CN204190594 U CN 204190594U CN 201420593761 U CN201420593761 U CN 201420593761U CN 204190594 U CN204190594 U CN 204190594U
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Abstract
A kind of generating set condensate pump permanent magnet speed regulation device, be arranged between motor and condensate pump, be made up of three parts, one is the magnetic conductor (overall rotor) be connected with motor, two is the permanent magnets (disk rotor) be connected with load, certain air gap is provided with between described magnetic conductor and permanent magnet, three is actuators, when load changes, motor speed is substantially constant, a control signal is received (as pressure at actuator, flow, liquid level etc.) change after, signal is identified and changes, the size of air gap between magnetic conductor and permanent magnet is regulated by actuator, the control of load output speed is realized by the adjustment of load torque, thus change output power of motor size, realize electrical machine energy-saving and improve motor working efficiency.
Description
Technical field
The utility model relates to power plant's technical field, is specifically related to a kind of generating set condensate pump permanent magnet speed regulation device.
Background technology
Condensate pump is subsidiary engine equipment main in thermodynamic system of steam tur, and its effect is that the condensate of condensing water tank is sent into deaerator after low-pressure heater heating, maintains deaerator level and stablizes; Under normal operating conditions, the water level in condenser mainly adjusts according to unit load change, and when unit load raises, condensing capacity increases, the corresponding rising of the water level in condenser, when unit load reduces, and the corresponding reduction of water level in condenser.
In Large-scale fire-electricity unit, the outfit of the using and the reserved all adopted by general condensate pump, adopt valve regulated in operation, unit is under full load situation, and condensation pump discharge control valve opening is between 45% ~ 65%, valve works under being in throttle always, particularly when comparatively underload or unit participate in peak regulation, valve opening is less, and throttling loss is large, the solidifying efficiency of pump also reduces rapidly, and energy consumption increases; When adopting valve regulated, low precision, water-level fluctuation is large; Because the throttling crushing after water adjustment in front of the door on deaerator is large, cause condensing water conduit to vibrate large, and valve itself washes away seriously, when unit load changes, cause water adjustment door on deaerator automatically to control more difficult; And valve frequent operation, cause the reliability decrease of valve, affect the stable operation of unit.
Therefore need to carry out speed governing transformation to solidifying pump, regulate the rotating speed of solidifying pump to regulate the water level of deaerator by speed regulating device; According to the performance curve of pump, the power that the operation of pump consumes and its rotating speed cube proportional, after rotating speed decline, energy-saving effect is obvious; After adopting speed governing to regulate, former control valve standard-sized sheet, decreases valve loss, decreases the maintenance workload of valve simultaneously.
Realize electric machine speed regulation at present and mainly contain multiple technologies and the methods such as frequency control, the speed governing of liquid coupling and permanent magnetic speed-adjusting.Liquid coupling driver due to volume large, difficult in maintenance, the not high reason of reliability is progressively eliminated; Although frequency control uses comparatively early in China, be of wide application, achieve larger success, but because frequency converter requires higher to running environment, electronic devices and components are wherein comparatively fast aging, and As time goes on failure rate significantly improves, and affect the safe and stable operation of equipment.
Utility model content
It is simple that technical problem to be solved in the utility model is to provide a kind of structure, the generating set condensate pump permanent magnet speed regulation device that practicality is stronger.
Technical problem to be solved in the utility model realizes by the following technical solutions:
A kind of generating set condensate pump permanent magnet speed regulation device, be arranged between motor and condensate pump, be made up of three parts, one is the magnetic conductor (overall rotor) be connected with motor, two is the permanent magnets (disk rotor) be connected with load, certain air gap is provided with between described magnetic conductor and permanent magnet, three is actuators, when load changes, motor speed is substantially constant, a control signal is received (as pressure at actuator, flow, liquid level etc.) change after, signal is identified and changes, the size of air gap between magnetic conductor and permanent magnet is regulated by actuator, the control of load output speed is realized by the adjustment of load torque, thus change output power of motor size, realize electrical machine energy-saving and improve motor working efficiency.
Described actuator comprises Non-follow control and automatically controlled two kinds of signal, and when adopting signal automatically controlled, control signal/feedback signal is delivered to PLC field controller or directly arrived DCS by actuator, is operated PLC field controller by man-machine interface or remote control.
The beneficial effects of the utility model are:
1. in-site installation is simple, convenient, only motor need be raised, and arrange separately cubicle without the need to needing as converter plant, install air-conditioning etc. additional.
2. after installing permanent magnetic device additional, condensate pump motor achieves soft start equally, starting current and start-up time greatly reduce, eliminate the impact to electrical network and load, avoid producing switching overvoltage and damaging electrical machine insulation, extend the useful life of motor and water pump.
3. can realize importing and exporting pitch standard-sized sheet, eliminate throttling loss, and energy evenly speed governing, meet peak regulation needs, reduce the shock effect to system, save mass energy simultaneously.
4. there is the feature that control precision is high, antijamming capability is strong, harmonic content is little, and have perfect defencive function, zero rotating speed smooth starting can be realized, be conducive to the safe operation of motor and water pump.
5. reduce vibration, the rotating machinery of more than 2/3 all breaks down due to vibration, most vibration is all because the imbalance of axle center skew, equipment and resonance cause, the key of permanent magnetic speed-adjusting vibration damping is by air gap transmitting torque, and there is no direct physical connection, fault also greatly reduces, and vibration can not be transmitted.
6. pair running environment is less demanding, and can use under comparatively adverse circumstances, reliability is higher, especially outstanding in high-power situation.
7. pair quality of power supply is less demanding, and permanent magnetic speed-adjusting can not by the impact of the quality of power supply, and very poor or can work between low pressure period in the quality of power supply, as long as there is effective energy to make electric machine rotation, permanent magnetic speed-adjusting just can work.Meanwhile, permanent magnetic speed-adjusting can not produce harmonic wave, instantaneous high pressure or other influences Power Quality Factors.
8. permanent magnetic speed-adjusting structure simple, useful life longer (being generally 25 years), maintenance workload are less, and maintenance cost is low, and the time is short.
9., because motor speed is constant, the heat that can produce in motor coil can by full speed electric rotating machine fan cooled, and the running environment of motor improves, can for a long time at low-speed running.
Accompanying drawing explanation
Fig. 1 is the utility model mounting structure figure;
Fig. 2 is the utility model fitting arrangement;
Fig. 3 is the utility model pie graph.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the utility model further.
As shown in Figure 1, Figure 3, a kind of generating set condensate pump permanent magnet speed regulation device, this device is made up of three parts, one is the magnetic conductor (overall rotor) 101 be connected with motor 10, two is the permanent magnets 102 (disk rotor) be connected with load, between magnetic conductor 101 and permanent magnet 102, be provided with certain air gap, three is actuators, condensate pump 30 carries out permanent magnetic speed-adjusting transformation, be exactly that original motor 10 is disconnected with the direct clutch that is connected of condensate pump 30, install a permanent-magnet speed governor 20 additional, permanent-magnet speed governor 20 is through the drive apparatus of air gap transmitting torque, without the need to being mechanically linked between motor 10 and load equipment rotating shaft, cutting magnetic line in the high-intensity magnetic field driving magnetic conductor 101 to produce at the permanent magnet 102 that powerful rare-earth magnet is housed when motor 10 rotates, thus in magnetic conductor 101, vortex flow is produced, this vortex flow produces dislike magnetic field on magnetic conductor 101, pull the relative motion of magnetic conductor 101 and permanent magnet 102, thus the torque transfer achieved between motor 10 and load.
When load changes, motor speed is substantially constant, a control signal is received (as pressure at actuator, flow, liquid level etc.) change after, signal is identified and changes, the size of air gap between magnetic conductor and permanent magnet is regulated by actuator, realized the control of load output speed by the adjustment of load torque, thus change output power of motor size, realize electrical machine energy-saving and improve motor working efficiency.
As shown in Figure 2, actuator comprises Non-follow control and automatically controlled two kinds of signal, and when adopting signal automatically controlled, control signal/feedback signal is delivered to PLC field controller or directly arrived DCS by actuator, is operated PLC field controller by man-machine interface or remote control.
The mounting means of permanent-magnet speed governor is simple, and quantities is little, and it is mounted between motor and load.In order to install permanent magnetic speed-adjusting driver, motor and load first must be taken apart and (only require that motor moves up by we, distance to permanent-magnet speed governor installation dimension), and permanent magnetic speed-adjusting driver is installed between motor and load, without the need to transforming original base and peripheral equipment.This programme selects WV-2500 type equipment, and motor only upwards need lift 1710mm.
Because our factory condensate pump motor is Large Copacity (2000kW) vertical installation, domesticly there is no the achievement that puts into operation.For possibility Problems existing, as motor raised after installing permanent magnet speed regulation device additional, intensity and vibration problem may be produced, the cooling problem that capacity motor is large, may produce heat, and control mode is converted into the problems such as pump housing speed adjustment by valve regulated, although can meet the demands from theory calculate to issuable problem, also need to measure through overtesting.On March 20th, 2011 debugs after carrying out permanent magnetic speed-adjusting transformation to condensate pump, records relevant parameter (see table one) when actuator position being placed on respectively during debugging 10% (5.6mA), 20% (7.2mA), 30% (8.8mA), 40% (10.4mA), 50% (12mA), 60% (13.6mA), 70% (15.2mA), 80% (16.8mA)
Table one:
Can be found out by upper table, when actuator position is 60% time, motor upper bracket East and West direction horizontal vibration is 43 μm to the maximum, reach good criteria, vibrate quite before transforming with permanent-magnet speed governor, in raising speed debug process, monitor the vibration of each point all the time, do not find that certain a bit vibrates and obviously increase phenomenon, namely within the scope of whole service, do not find resonance point.Calculate its vibration values in theory should decline to some extent, but due to motor be vertical installation, motor has been elevated 1.7 meters, its produce degree of disturbing counteract vibration drop-out value.But water pump vibration values declines more, maximum only 14 μm.
Within the six months of putting equipment in service, we make regular check on this system and carry out checking and testing, the maximum vibration recording motor upper bracket is 42 μm, the vibration at other position less (and it is quite large to shake between limber up period), and the operation sound of motor and water pump is also comparatively transformed and taken a turn for the better to some extent.
#2 unit condensate pump A meeting long-play under nominal situation, when unit load changes, electric operator can respond fast, changes the air gap of the instruction adjustment permanent magnetism of Ning Beng actuator.Permanent magnet actuator is from the water level of motion tracking deaerator simultaneously, when the water level of deaerator and set point have deviation, PID will regulate permanent magnet actuator instruction, in adjustment process, cause solidifying pump discharge pressure too low in order to avoid aperture is too small, when outlet pressure is less than 1.4MPa, pressure can participate in PID adjustment, now regulates condensate pressure by the aperture of PID adjustment main inlet control valve.Guarantee unit safety stable operation.
When solidifying pump A permanent magnetic device fault trip or scheduled overhaul, need to switch solidifying pump B to run, now solidifying pump constant speed is run and cannot be regulated deaerator level, in logic, deaerator level main inlet control valve is adjusted to certain aperture, the secondary adjuster valve of deaerator will follow the tracks of deaerator level, PID, according to bias adjustment aperture between water level and set point, ensures that condensate system is normally run.
In order to prevent the axle system safety of the sharply variable effect water pump of speed regulator speed, when ensureing condensate system safety, we have turned down the governing speed of speed regulator actuator, namely when permanent-magnet speed governor by maximum air gap be 40mm (aperture 0%) to be transferred to minimal air gap be 3.3mm (aperture 100%) time, actuator's driving shaft stroke about 120 circle, regulating time about 300 paper money, vice versa.
Invite Anhui Province electric power science and technology institute to before the transformation of our factory condensate pump and the work tested of the improved energy consumption of condensate pump transformation permanent magnetism on September 14 on February 22nd, 2011, test result is respectively in table two and table three:
Data before the transformation of table two actual measurement condensate pump on February 22:
Data after the transformation of table three actual measurement condensate pump on September 14:
Note: in table, force value is gauge pressure
Contrast table two and table three draw, under unit 580MW load condition, A condensate pump system unit is down to 1.06 (kWh/t) than wasted work by 1.32 (kWh/t), and specific energy consumption reduces about 19.7%; Under 540MW load condition, A condensate pump system unit is down to 1.04 (kWh/t) than wasted work by 1.41 (kWh/t), and specific energy consumption reduces about 26.3%; Under 500MW load condition, A condensate pump system unit is down to 1.00 (kWh/t) than wasted work by 1.49 (kWh/t), and specific energy consumption reduces about 32.9%; Under 420MW load condition, A condensate pump system unit is down to 0.96 (kWh/t) than wasted work by 1.67 (kWh/t), and specific energy consumption reduces about 42.5%; Under 360MW load condition, A condensate pump system unit is down to 0.92 (kWh/t) than wasted work by 1.81 (kWh/t), and specific energy consumption reduces about 49.2%.
After the transformation of condensate pump permanent magnetism, Main Economic data are as follows:
1) after the transformation of condensate pump permanent magnetism, due to female pipe adjuster valve standard-sized sheet, lift (throttling loss) declines to a great extent, along with the change of load, condensate pump outlet main-piping pressure decline 0.85MPa during 580MW load, condensate exit of pump main-piping pressure decline 1.46MPa during 500MW load, condensate exit of pump main-piping pressure decline 1.92MPa during 420MW load, condensate outlet main-piping pressure decline 2.22MPa during 360MW load.
2) after the transformation of condensate pump permanent magnetism, condensate pump significantly promotes along with lowering efficiency of rotating speed, but is substantially directly proportional to the drop-out value of rotating speed due to the decrease in efficiency of permanent magnet speed regulation device self.Therefore pump group efficiency is in overall slowly downward trend.During change 580MW load along with load, condensate pump group efficiency drops to 62% by 68%, during 500MW load, condensate pump efficiency drops to 54% by 64%, when during 420MW load, condensate pump efficiency drops to 47%, 360MW load by 59%, condensate pump efficiency drops to 42% by 56%.
3) after the transformation of condensate pump permanent magnetism, due to condensate pump group power consumption along with the reduction of rotating speed significantly reduces.Condensate pump group power reduction 273kW during change 580MW load along with load, condensate pump group power reduction 420kW during 500MW load, condensate pump group power reduction 575kW during 420MW load, condensate pump group power reduction 659kW during 360MW load.
Because the difference of the loss of regulative mode under flow restriction control operating mode different from gearshift adjustment is different, and be non-linear relation with unit output, therefore the annual electric energy saved of estimation must carry out segmentation calculating, concrete as table four:
Table 4
Note: 1) annual unit is according to operation 320 days (7680 hours), annual utilization hours is considered to calculate for 5810 hours; 2) income is according to often spending electricity 0.35 yuan of cost calculation;
After permanent magnetic speed-adjusting transformation, the average power saving rate of condensate pump is 33.5%, annual save power about 3,480,000 kWh, annual earnings 122 about ten thousand yuan.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. a generating set condensate pump permanent magnet speed regulation device, be arranged between motor and condensate pump, it is characterized in that: this permanent magnet speed regulation device is made up of three parts, one is the magnetic conductor be connected with motor, two is the permanent magnets be connected with condensate pump, three is actuators, certain air gap is provided with between described magnetic conductor and permanent magnet, when load changes, motor speed is constant, receive the change of a control signal at actuator after, signal is identified and changes, the size of air gap between magnetic conductor and permanent magnet is regulated by actuator, the control of condensate pump output speed is realized by the adjustment of condensate pump moment of torsion, change output power of motor size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420593761.8U CN204190594U (en) | 2014-10-14 | 2014-10-14 | Generating set condensate pump permanent magnet speed regulation device |
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| CN201420593761.8U CN204190594U (en) | 2014-10-14 | 2014-10-14 | Generating set condensate pump permanent magnet speed regulation device |
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| CN204190594U true CN204190594U (en) | 2015-03-04 |
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| CN201420593761.8U Expired - Fee Related CN204190594U (en) | 2014-10-14 | 2014-10-14 | Generating set condensate pump permanent magnet speed regulation device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276304A (en) * | 2017-08-02 | 2017-10-20 | 辽宁清河发电有限责任公司 | Water circulating pump shaft coupling |
| CN108282047A (en) * | 2018-03-14 | 2018-07-13 | 宿州迅驰电子科技有限公司 | A kind of easily draining stepper motor |
| CN112696361A (en) * | 2020-12-03 | 2021-04-23 | 苏州热工研究院有限公司 | Nuclear power plant condensate water speed regulating system |
| CN114251257A (en) * | 2022-03-02 | 2022-03-29 | 天津国能津能滨海热电有限公司 | Method and system for controlling rotating speed of permanent magnet condensate pump, electronic equipment and storage medium |
-
2014
- 2014-10-14 CN CN201420593761.8U patent/CN204190594U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276304A (en) * | 2017-08-02 | 2017-10-20 | 辽宁清河发电有限责任公司 | Water circulating pump shaft coupling |
| CN108282047A (en) * | 2018-03-14 | 2018-07-13 | 宿州迅驰电子科技有限公司 | A kind of easily draining stepper motor |
| CN112696361A (en) * | 2020-12-03 | 2021-04-23 | 苏州热工研究院有限公司 | Nuclear power plant condensate water speed regulating system |
| CN114251257A (en) * | 2022-03-02 | 2022-03-29 | 天津国能津能滨海热电有限公司 | Method and system for controlling rotating speed of permanent magnet condensate pump, electronic equipment and storage medium |
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