CN104314786A - Energy-saving boiler feed pump drive system for thermal power plant - Google Patents
Energy-saving boiler feed pump drive system for thermal power plant Download PDFInfo
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- CN104314786A CN104314786A CN201410574764.1A CN201410574764A CN104314786A CN 104314786 A CN104314786 A CN 104314786A CN 201410574764 A CN201410574764 A CN 201410574764A CN 104314786 A CN104314786 A CN 104314786A
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Abstract
The invention provides an energy-saving boiler feed pump drive system for a thermal power plant and solves the configuration problem of the water feed pump of a current thermal power generating unit and the problem that the water feed pump is high in energy consumption. A synchronous automatic clutch is disposed between a small steam turbine and a synchronous motor. A planet gear speed regulating device is disposed between the synchronous motor and the water feed pump. The synchronous motor is connected into a plant bus through a synchronizing switch. The water feed pump can be driven by the small steam turbine or the motor, the reliability is higher than a traditional steam pump manner or electric pump manner, optimized operation according to unit back pressure conditions can be achieved, and the drive manner of the water feed pump can be switched timely to save energy. An independent steam discharge cooling system for the small steam turbine is not needed, steam discharged from the small steam turbine can be directly discharged into a mainframe steam discharge system, influence on water feed adjusting due to the fact the shaft power of the small steam turbine is affected by back pressure sudden drop caused by high back pressure and heavy winds does not need to be worried about even for direct air cooling units, and system simplification and project construction cost lowering are facilitated.
Description
Technical field
The present invention relates to heat power plant boiler feed water pump drive system, be specially a kind of energy-saving type boiler feed water pump drive system for thermal power plant.
Background technique
Boiler feed pump is the prominent subsidiary engine in thermal power plant, the driving mode of feed water pump is very large to unit online capacity impact, the height of boiler feed-water pump efficiency also affects very large on units consumption, current domestic boiler feed pump has small turbine and motor to drive two kinds of modes, the external mode also having main steam turbine Direct driver feed water pump.Feed water pump is arranged will meet unit 105 ~ 110%BMCR operating mode, induced draught fan is arranged will meet TB operating mode, relative to accidental conditions, design point inherently departs from more, and the allowance to cause because of reasons such as design, manufactures superposes the problem that causes allowance excessive at also ubiquity at present, the serious unit of situation, under oepration at full load operating mode, drives the small turbine admission control valve position of boiler feed pump and induced draught fan less than 50%, causes inefficiency.
In recent years, domestic northern area has put into operation a large amount of Air-cooled Unit, especially the feed water pump matching mode of large-scale air cooling unit is a difficult problem, configuration electrically driven feedpump can cause station service power consumption rate obviously to raise, too much consumption main engine power generation amount, cause electricity volume to reduce, and due to the restriction by water resources, the small turbine of current Air-cooled Unit configuration wet type cooling is impossible.Indirect air cooling crew qiting steam feed pump can be selected small steam turbine exhaust steam directly to enter cool circulation water between main frame vapour condenser or utilization and arrange separately small turbine vapour condenser, this configuration mode can realize the object reducing station service power consumption rate, but drives the mode energy consumption of feed water pump higher relative to the clammy mode of small turbine and motor.Direct Air-cooled Unit, realize steam feed pump mode, general employing small turbine arranges separately indirect air cooling system or adopts small steam turbine exhaust steam directly to enter main frame steam exhaust device, before adopting, a kind of mode is close with indirect air cooling unit, and a kind of mode after adopting, because small turbine will meet main frame high back pressure in summer operating mode and large wind-induced back pressure bust operating mode simultaneously, small turbine needs larger design capacity, cause the long-term underrun of small turbine, have a strong impact on efficiency.
Small turbine is in order to meet boiler feedwater control requirement, and admission modulating valve is in part aperture and dynamic conditioning operating mode all the time, and under this operating mode, small turbine efficiency is lower than valve widely open condition.
Small turbine is in order to meet the requirement of unit varying load condition, generally low-pressure steam source (main vapour source) and high-pressure steam source (standby steam source) are all set, and there is vapour source switching point, unit is at running on the lower load, high-pressure steam source (generally taking from two sections, main frame to draw gas or main steam) will be dropped into, consume high-grade vapour source and unit cycle efficiency can be caused to reduce.
The mode of external main steam turbine Direct driver feed water pump, there is no application achievement at home, equipment manufacturing needs to solve axle system and to expand the problems such as the equipment connection that causes, and feed water pump and main steam turbine are linked to be reliability and the flexible operation sex chromosome mosaicism of an axle system, and power plant also compares concern always.
Wet type cooling unit due to annual back pressure more stable, unit whole year operation operating mode is also more stable, and Air-cooled Unit will meet the load scheduling requirement of current electrical network, must meet unit in design completely to send out under back pressure in summer, boiler design steam output compared with normal operating conditions can be caused so bigger than normal, and equipment manufacturing cost increases, steam turbine operation energy consumption under summer back pressure is higher, under accidental conditions, unit load coefficient is relatively on the low side, also affects unit efficiency.
Summary of the invention
The present invention, in order to the higher problem of the feed water pump matching problem and energy consumption that solve at present puzzlement Air-cooled Unit, provides a kind of energy-saving type boiler feed water pump drive system for thermal power plant.
The present invention adopts following technological scheme to realize: a kind of energy-saving type boiler feed water pump drive system for thermal power plant, comprise small turbine, synchronous machine, planetary pinion arrangements for speed regulation, synchronous automatic clutch, reduction gear box and synchronizing switch, the drive end of small turbine is connected by the input end of reduction gear box with synchronous automatic clutch, the output terminal of synchronous automatic clutch is connected with one end of synchronous machine, the other end of synchronous machine is connected with feed water pump by planetary pinion arrangements for speed regulation, and synchronous machine accesses auxiliary bus bar by synchronizing switch.
When Air-cooled Unit is normally run, small turbine remains that admission modulating valve standard-sized sheet operating mode is run, avoid the little problem causing operational efficiency low of small turbine admission control valve opening, small turbine also need not arrange separately steam discharge cooling system, the steam discharge of small turbine can directly enter main steam turbine exhauster system, even if for Direct Air-cooled Unit, also need not worry that high back pressure and strong wind cause back pressure bust operating mode affect small turbine air horsepower and impact feedwater adjustment, and contribute to simplification system and reduce engineering cost.Small turbine is by reduction gear box deceleration synchronous machine, synchronous machine can realize motor-operation and generator mode is run, and when small turbine normally runs, synchronous machine realizes generator mode and runs, during small turbine fault, out of service by synchronous automatic clutch.Synchronous machine realizes electric operation mode, synchronous machine is generator mode when running, and is equivalent to alternative induced draught fan steam turbine, can adopts the electronic induced draught fan of adjusting rotor blade axial flow, while realizing reducing station service power consumption rate further, energy consumption is again lower than steam-driven induced draft fan mode.Synchronous machine drives feed water pump by planetary pinion arrangements for speed regulation, is completed the rotational speed regulation of feed water pump by planetary pinion arrangements for speed regulation.
A kind of energy-saving type boiler feed water pump drive system for thermal power plant, comprise small turbine, synchronous machine, planetary pinion arrangements for speed regulation, synchronous automatic clutch, reduction gear box and synchronizing switch, the drive end of small turbine is connected with one end of synchronous machine by synchronous automatic clutch, the other end of synchronous machine is connected with feed water pump with planetary pinion arrangements for speed regulation by the reduction gear box connected successively, and synchronous machine accesses auxiliary bus bar by synchronizing switch.
Small turbine drives synchronous machine, synchronous machine drives feed water pump by reduction gear box and planetary pinion arrangements for speed regulation, completed the rotational speed regulation of feed water pump by reduction gear box and planetary pinion arrangements for speed regulation, realize small turbine by synchronous automatic clutch and drop into or operation out of service.
A kind of energy-saving type boiler feed water pump drive system for thermal power plant, comprise small turbine, synchronous machine, planetary pinion arrangements for speed regulation, synchronous automatic clutch and synchronizing switch, the drive end of small turbine is connected with one end of synchronous machine by synchronous automatic clutch, the other end of synchronous machine is connected with feed water pump by planetary pinion arrangements for speed regulation, and synchronous machine accesses auxiliary bus bar by synchronizing switch.
Small turbine drives synchronous machine, and synchronous machine drives feed water pump by planetary pinion arrangements for speed regulation, is completed the rotational speed regulation of feed water pump by planetary pinion arrangements for speed regulation, realizes small turbine drop into or operation out of service by synchronous automatic clutch.
The invention has the beneficial effects as follows:
1) small turbine of the present invention keeps full-gear at unit accidental conditions (load 50 ~ 100% scope) admission modulating valve, and the method for operation of feed pump turbine more traditional and induced draught fan steam turbine admission modulating valve part aperture has obvious odds for effectiveness.(traditional feed pump turbine design, under desirable design condition, when unit load is close to 50% or 100% operating mode, feed pump turbine is near vapour source switching point, and low-pressure steam source control valve opening, generally close to 80%, avoids high-pressure steam source modulating valve to open simultaneously as far as possible, interval at 50 ~ 100% shoulder loads, low pressure modulating valve aperture is greatly about 60 ~ 80%, but due to design, manufacture deviation or allowance superposition, operating mode departs from mostly even more serious; The accidental conditions of induced draught fan is compared with TB operating mode, and depart from more compared with 105 ~ 110%BMCR operating mode compared with the accidental conditions of feed water pump, in induced draught fan steam turbine operation, control valve opening is less, and efficiency is lower);
2) small turbine of the present invention can be dropped into by synchronous automatic clutch or out of service, run according to the in good time handover optimization of the height of main steam turbine back pressure, and (unit is in oepration at full load in summer operating mode to reach the minimum object of unit operation energy consumption, small turbine is out of service, unit total piston displacement reduces about 7%, main frame back pressure approximately can reduce by 2 ~ 3kPa, about reduces net coal consumption rate 2 ~ 3g/kWh);
3) small turbine capacity of the present invention is approximately the twice adopting the feed pump turbine of current conventional arrangement and the capacity sum of induced draught fan steam turbine or feed pump turbine capacity, and under same design condition, the internal efficiency ratio of small turbine is relatively high.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment one.
Fig. 2 is the structural representation of embodiment two.
Fig. 3 is the structural representation of embodiment three.
In figure: 1-small turbine, 2-synchronous machine, 3-feed water pump, 4-planetary pinion arrangements for speed regulation, the synchronous automatic clutch of 5-, 6-reduction gear box, 7-synchronizing switch, 8-auxiliary bus bar.
Embodiment
Embodiment one: as shown in Figure 1, a kind of energy-saving type boiler feed water pump drive system for thermal power plant, comprise small turbine 1, synchronous machine 2, planetary pinion arrangements for speed regulation 4, synchronous automatic clutch 5, reduction gear box 6 and synchronizing switch 7, the drive end of small turbine 1 is connected with the input end of synchronous automatic clutch 5 by reduction gear box 6, the output terminal of synchronous automatic clutch 5 is connected with one end of synchronous machine 2, the other end of synchronous machine 2 is connected with feed water pump 3 by planetary pinion arrangements for speed regulation 4, synchronous machine 2 accesses auxiliary bus bar 8 by synchronizing switch 7.
When Air-cooled Unit is normally run, for 660MW Air-cooled Unit configuration 2 × 50% capacity feed water pump group oepration at full load operating modes, in the normal situation of turbine back pressure, small turbine admission modulating valve standard-sized sheet, export about 25MW air horsepower, small turbine adopts high Design of Rotation, such as design speed is 4500rpm, 1500rpm is decelerated to by reduction gear box, drive 4 electrode synchronization electromotors to do generator operating mode to run, owing to being incorporated to auxiliary bus bar, so axle system stabilization of speed, synchronous machine drives feed water pump by planetary pinion arrangements for speed regulation, the rotational speed regulation of boiler feed pump is completed by planetary pinion arrangements for speed regulation, feed pump shaft power is about 13MW, thus synchronous machine generated output is about 12MW(synchronous machine rated power and selects 15MW, meet the requirement of feed water pump adapted motor, be greater than the air horsepower difference of small turbine and feed water pump simultaneously, under meeting the different operating conditions of Air-cooled Unit, when ensureing that small turbine admission modulating valve standard-sized sheet operating mode is run, the not super rated power of synchronous machine).
Summer condition: cause units consumption to raise because main frame back pressure raises, under this operating mode, small turbine of can stopping transport, synchronous automatic clutch is thrown off automatically, synchronous machine proceeds to motor working condition and runs, drive feed water pump by it, feed water pump switches to electronic mode by steam-operating mode, when main engine power generation power is constant, the steam discharge total amount entering Air-Cooling Island reduces, when Air-Cooling Island cool condition is constant, back pressure is minimized, and thus units consumption reduces.
Accident conditions: when small turbine fault, out of service by synchronous automatic clutch, synchronous machine automatically switches to motor working condition by generator operating mode, feed water pump drives no-harass switch to be synchronous machine drives by small turbine; When synchronous machine generation electrical failure, synchronizing switch trips, synchronous machine and auxiliary bus bar off-the-line, pass through Thermal Control System, the locking of planetary pinion arrangements for speed regulation fluid torque converter valve position, small turbine partial load rejection, admission modulating valve quick closing valve, to setting valve position, proceeds to rotating speed control mode and carries out feedwater adjustment; When the mechanical failure needing tripping operation occurs synchronous machine, or when feed water pump breaks down, small turbine and synchronous machine trip simultaneously, and feed water pump group entirety is out of service; Adopt the planetary pinion arrangements for speed regulation with braking device, Feed Pump Trip can be realized, small turbine partial load rejection, admission modulating valve quick closing valve is to setting valve position, ensure that synchronous machine does not exceed name-plate rating, continue to keep generator operating mode to run, the feed water pump group reliability of the program higher than separately by small turbine or motor drive mode.
Embodiment two: as shown in Figure 2, a kind of energy-saving type boiler feed water pump drive system for thermal power plant, comprise small turbine 1, synchronous machine 2, planetary pinion arrangements for speed regulation 4, synchronous automatic clutch 5, reduction gear box 6 and synchronizing switch 7, the drive end of small turbine 1 is connected with one end of synchronous machine 2 by synchronous automatic clutch 5, the other end of synchronous machine 2 is connected with feed water pump 3 with planetary pinion arrangements for speed regulation 4 by the reduction gear box 6 connected successively, and synchronous machine 2 accesses auxiliary bus bar 8 by synchronizing switch 7.
Employing design speed is that the small turbine of 3000rpm drives 2 electrode synchronization electromotors by synchronous automatic clutch, and synchronous machine is decelerated to 1500rpm by reduction gear box, then drives feed water pump by planetary pinion arrangements for speed regulation.
Embodiment three: as shown in Figure 3, a kind of energy-saving type boiler feed water pump drive system for thermal power plant, comprise small turbine 1, synchronous machine 2, planetary pinion arrangements for speed regulation 4, synchronous automatic clutch 5 and synchronizing switch 7, the drive end of small turbine 1 is connected with one end of synchronous machine 2 by synchronous automatic clutch 5, the other end of synchronous machine 2 is connected with feed water pump 3 by planetary pinion arrangements for speed regulation 4, and synchronous machine 2 accesses auxiliary bus bar 8 by synchronizing switch 7.
Employing design speed is that the small turbine of 3000rpm drives 2 electrode synchronization electromotors by synchronous automatic clutch, and employing input speed is that the planetary pinion arrangements for speed regulation of 3000rpm drive feed water pump.
Claims (3)
1. the energy-saving type boiler feed water pump drive system for thermal power plant, it is characterized in that comprising small turbine (1), synchronous machine (2), planetary pinion arrangements for speed regulation (4), synchronous automatic clutch (5), reduction gear box (6) and synchronizing switch (7), the drive end of small turbine (1) is connected with the input end of synchronous automatic clutch (5) by reduction gear box (6), the output terminal of synchronous automatic clutch (5) is connected with one end of synchronous machine (2), the other end of synchronous machine (2) is connected with feed water pump (3) by planetary pinion arrangements for speed regulation (4), synchronous machine (2) is by synchronizing switch (7) access auxiliary bus bar (8).
2. the energy-saving type boiler feed water pump drive system for thermal power plant, it is characterized in that comprising small turbine (1), synchronous machine (2), planetary pinion arrangements for speed regulation (4), synchronous automatic clutch (5), reduction gear box (6) and synchronizing switch (7), the drive end of small turbine (1) is connected with one end of synchronous machine (2) by synchronous automatic clutch (5), the other end of synchronous machine (2) is connected with feed water pump (3) with planetary pinion arrangements for speed regulation (4) by the reduction gear box (6) connected successively, synchronous machine (2) is by synchronizing switch (7) access auxiliary bus bar (8).
3. the energy-saving type boiler feed water pump drive system for thermal power plant, it is characterized in that comprising small turbine (1), synchronous machine (2), planetary pinion arrangements for speed regulation (4), synchronous automatic clutch (5) and synchronizing switch (7), the drive end of small turbine (1) is connected with one end of synchronous machine (2) by synchronous automatic clutch (5), the other end of synchronous machine (2) is connected with feed water pump (3) by planetary pinion arrangements for speed regulation (4), and synchronous machine (2) is by synchronizing switch (7) access auxiliary bus bar (8).
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013260A (en) * | 2017-04-10 | 2017-08-04 | 西安西热节能技术有限公司 | System and its operation method based on the double drives of air-introduced machine vapour electricity and variable-frequency power generation |
| CN107100853A (en) * | 2017-07-04 | 2017-08-29 | 山西漳电大唐塔山发电有限公司 | A kind of auxiliary power system for two-shipper backheat |
| CN108131306A (en) * | 2018-03-02 | 2018-06-08 | 联锋能源技术（北京）有限公司 | A kind of more rotating speed vapour electricity dual drive systems for axial fan |
| CN108386238A (en) * | 2018-02-11 | 2018-08-10 | 大同煤矿集团有限责任公司 | A kind of motor-small turbine variable speed dual drive system |
| CN108868908A (en) * | 2018-06-26 | 2018-11-23 | 中国电力工程顾问集团华东电力设计院有限公司 | Control method, device and the backheat small turbine system of backheat small turbine |
| CN109707809A (en) * | 2017-10-26 | 2019-05-03 | 彼得·斯佩克 | Device and method for operating speed variable working equipment |
| CN109763866A (en) * | 2019-03-01 | 2019-05-17 | 郑州机械研究所有限公司 | The high-speed gear box and operation method of integrated high-power full-automatic clutch |
| CN110500142A (en) * | 2019-08-01 | 2019-11-26 | 大唐郓城发电有限公司 | A kind of ultra supercritical double reheat power generation sets water supply mercury vapour electricity hybrid drive and method |
| CN112483419A (en) * | 2020-11-23 | 2021-03-12 | 东方电气集团东方汽轮机有限公司 | Double dynamical boiler feed pump system of nimble switching |
| CN113107801A (en) * | 2021-04-27 | 2021-07-13 | 中国舰船研究设计中心 | Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof |
| CN113236525A (en) * | 2021-06-11 | 2021-08-10 | 西安热工研究院有限公司 | Method for transforming steam-driven water feeding pump into double-fed motor driven water feeding pump and starting method |
| CN114483552A (en) * | 2022-02-18 | 2022-05-13 | 重庆江增船舶重工有限公司 | Control method for steam-electricity double-drive water pump system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107013260A (en) * | 2017-04-10 | 2017-08-04 | 西安西热节能技术有限公司 | System and its operation method based on the double drives of air-introduced machine vapour electricity and variable-frequency power generation |
| CN107100853A (en) * | 2017-07-04 | 2017-08-29 | 山西漳电大唐塔山发电有限公司 | A kind of auxiliary power system for two-shipper backheat |
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| CN108131306A (en) * | 2018-03-02 | 2018-06-08 | 联锋能源技术（北京）有限公司 | A kind of more rotating speed vapour electricity dual drive systems for axial fan |
| CN108868908A (en) * | 2018-06-26 | 2018-11-23 | 中国电力工程顾问集团华东电力设计院有限公司 | Control method, device and the backheat small turbine system of backheat small turbine |
| CN109763866A (en) * | 2019-03-01 | 2019-05-17 | 郑州机械研究所有限公司 | The high-speed gear box and operation method of integrated high-power full-automatic clutch |
| CN110500142A (en) * | 2019-08-01 | 2019-11-26 | 大唐郓城发电有限公司 | A kind of ultra supercritical double reheat power generation sets water supply mercury vapour electricity hybrid drive and method |
| CN112483419A (en) * | 2020-11-23 | 2021-03-12 | 东方电气集团东方汽轮机有限公司 | Double dynamical boiler feed pump system of nimble switching |
| CN113107801A (en) * | 2021-04-27 | 2021-07-13 | 中国舰船研究设计中心 | Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof |
| CN113236525A (en) * | 2021-06-11 | 2021-08-10 | 西安热工研究院有限公司 | Method for transforming steam-driven water feeding pump into double-fed motor driven water feeding pump and starting method |
| CN114483552A (en) * | 2022-02-18 | 2022-05-13 | 重庆江增船舶重工有限公司 | Control method for steam-electricity double-drive water pump system |
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Application publication date: 20150128 |