CN104405655A - Energy-saving type boiler induced-draft fan driving system applied to thermal power plant - Google Patents
Energy-saving type boiler induced-draft fan driving system applied to thermal power plant Download PDFInfo
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- CN104405655A CN104405655A CN201410697982.4A CN201410697982A CN104405655A CN 104405655 A CN104405655 A CN 104405655A CN 201410697982 A CN201410697982 A CN 201410697982A CN 104405655 A CN104405655 A CN 104405655A
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Abstract
The invention relates to a driving device for an induced-draft fan of a thermal power plant, and specifically provides an energy-saving type boiler induced-draft fan driving system applied to the thermal power plant. The system comprises a small steam turbine, a reduction gear box and a motor; an output shaft of the small steam turbine is connected with an input shaft of the reduction gear box, and while the output shaft of the reduction gearbox is connected with the motor, wherein the motor is connected with the induced draft fan; a wiring end of the motor is connected with a plant bus through a switch. With the adoption of the energy-saving type boiler induced-draft fan driving system applied to the thermal power plant, the induced-draft fan can be individually driven through the small steam turbine or through the combination of the small steam turbine and the motor, high efficiency can be kept, and the voltage grade of the motor can be controlled to be 6kV.
Description
Technical field
The present invention relates to the drive unit of power station induced draught fan, be specially a kind of energy-saving type boiler induced draught fan drive system for thermal power plant.
Background technique
Boiler induced-draft fan is the Important Auxiliary equipment in thermal power plant, itself and desulphurization devices merge, be called " unification is drawn in increasing " induced draught fan, after considering denitration resistance, be called " three-in-one " induced draught fan, become the high-power subsidiary engine that power is only second to feed water pump, in recent years because environmental emission standard improves, it is more that environmental protection facility causes boiler smoke resistance to increase, the power of induced draught fan is caused also constantly to increase, put into operation unit while carrying out environmental protection equipment transformation, and induced draught fan, often because of undercapacity, also faces transform measure.
Service Power in Thermal Power Plant pressure grade is mostly 6kV, when the feed water pump of 600MW level Air-cooled Unit adopts electronic mode and 1000MW unit be 10kV, the auxiliary bus bar of 6kV electric pressure generally can start the equipment being no more than about 7000 ~ 8000kW power, exceedes the electric pressure that this power just needs to adopt 10kV.Current 600MW level and above new-built unit induced draught fan are according to electronic mode, and station-service electric pressure generally needs to adopt 10kV, adds equipment investment, and because consumption rate is comparatively large, therefore many thermal power plants induced draught fan have employed steam-operating mode.
Because induced draught fan will according to TB operating mode (test block, fan capacity examination operating mode, namely under boiler maximum continuous rating operating mode, consider air quantity, fan condition after blast allowance) configuration, when adopting steam-operating mode, small turbine (i.e. industrial drives steam turbine, the steam turbine of subsidiary engine generally will be driven to be called small turbine in thermal power plant) air horsepower to meet induced draught fan TB operating mode under air horsepower, this configuration mode, driving power during the design air horsepower of small turbine and unit normally run needed for induced draught fan departs from more, cause the small turbine admission control valve opening that is in operation less, unit is under 50% ~ 100% load operation operating mode, small turbine admission control valve position is approximately about 30% ~ 50%, very large on efficiency impact.
The induced draught fan of new-built unit selects electronic or steam-operating mode is not difficult, but cause flue gas resistance to increase for because of environmental protection facility transformation, need the in-service unit to the corresponding capacity-increasing transformation of induced draught fan, modification scheme restraining factors are then more, as run into the problem such as station-service electric pressure, house transformer off-capacity.
Summary of the invention
The present invention is energy consumption higher, inefficient problem during solution current induced draught fan employing steam-operating mode, provide a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, and contribute to the problem solving electrical capacity deficiency in in-service unit induced draught fan capacity-increasing transformation.
The present invention adopts following technological scheme to realize: a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine, reduction gear box and motor, the output shaft of small turbine is connected with the input shaft of reduction gear box, the output shaft of reduction gear box is connected with motor, motor is connected with induced draught fan, and the terminal of motor access auxiliary bus bar by switch.
At the operating conditions that unit load is higher, or other factors cause induced draught fan to exert oneself larger operating mode, and induced draught fan combines driving by small turbine and motor, small turbine admission modulating valve standard-sized sheet, keep Effec-tive Function; In the unit, underrun operating mode, motor switch disconnects, induced draught fan is driven separately by small turbine, small turbine admission modulating valve keeps larger opening, keep Effec-tive Function, or small turbine admission modulating valve standard-sized sheet, motor is in operation state of generator, and power margin is transported to station service electrical system with the form of electric energy; Small turbine admission modulating valve standard-sized sheet or maintenance larger opening, relative to the aperture of current 30% ~ 50%, significantly improve the efficiency of small turbine.
A kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine, multiaxis reduction gear box and motor, the output shaft of small turbine is connected with the first coupling shaft of multiaxis reduction gear box, the output shaft of motor is connected with the second coupling shaft of multi-shaft gear box, the output shaft of multiaxis reduction gear box is connected with induced draught fan, and the terminal of motor access auxiliary bus bar by switch.Select multiaxis reduction gear box can shorten the axial length of blower fan group, be convenient to apparatus arrangement.This drive system can realize small turbine separately or combine driving induced draught fan with motor, makes the admission modulating valve of steam turbine keep larger opening or standard-sized sheet, relative to the aperture of current 30% ~ 50%, significantly improves the efficiency of small turbine.
Above-mentioned a kind of energy-saving type boiler induced draught fan drive system, the terminal of motor are connected with switch by frequency variator, are applicable to variable rotating speed fan and drive.
Above-mentioned a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, is provided with synchronous automatic clutch between multiaxis reduction gear box and motor, can be automatically out of service when motor does not work.
The invention provides a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, native system realizes driving induced draught fan by small turbine separately or combining driving induced draught fan by small turbine and motor, and keeping higher efficiency, the electric pressure of motor is selected also can control at 6kV.
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.
Fig. 4 is the structural representation of embodiment four.
Fig. 5 is the structural representation of embodiment five.
Fig. 6 is the structural representation of embodiment six.
1-small turbine, 2-reduction gear box, 3-motor, 4-induced draught fan, 5-frequency variator, 6-switch, 7-auxiliary bus bar, 8-multiaxis reduction gear box, the synchronous automatic clutch of 9-.
Embodiment
Embodiment one:
As shown in Figure 1, a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine 1, reduction gear box 2 and motor 3, the output shaft of small turbine 1 is connected with the input shaft of reduction gear box 2, the output shaft of reduction gear box 2 is connected with motor 3, motor 3 is connected with induced draught fan 4, and the terminal of motor 3 access auxiliary bus bar 7 by switch 6.
Embodiment two:
As shown in Figure 2, a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine 1, reduction gear box 2 and motor 3, the output shaft of small turbine 1 is connected with the input shaft of reduction gear box 2, the output shaft of reduction gear box 2 is connected with motor 3, motor 3 is connected with induced draught fan 4, and the terminal of motor 3 access auxiliary bus bar 7 by frequency variator 5 and switch 6.
Embodiment three:
As shown in Figure 3, a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine 1, multiaxis reduction gear box 8 and motor 3, the output shaft of small turbine 1 is connected with the first coupling shaft of multiaxis reduction gear box 8, motor 3 is connected with the second coupling shaft of multiaxis reduction gear box 8, the output shaft of multiaxis reduction gear box 8 is connected with induced draught fan 4, and the terminal of motor 3 access auxiliary bus bar 7 by switch 6.
Embodiment four:
A kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine 1, multiaxis reduction gear box 8 and motor 3, the output shaft of small turbine 1 is connected with the first coupling shaft of multiaxis reduction gear box 8, motor 3 is connected with the second coupling shaft of multiaxis reduction gear box 8, the output shaft of multiaxis reduction gear box 8 is connected with induced draught fan 4, and the terminal of motor 3 access auxiliary bus bar 7 by frequency variator 5 and switch 6.
Embodiment five:
As shown in Figure 5, a kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine 1, multiaxis reduction gear box 8 and motor 3, the output shaft of small turbine 1 is connected with the first coupling shaft of multiaxis reduction gear box 8, motor 3 is connected by synchronous automatic clutch 9 with the second coupling shaft of multiaxis reduction gear box 8, the output shaft of multiaxis reduction gear box 8 is connected with induced draught fan 4, and the terminal of motor 3 access auxiliary bus bar 7 by switch 6.
Embodiment six:
A kind of energy-saving type boiler induced draught fan drive system for thermal power plant, comprise small turbine 1, multiaxis reduction gear box 8 and motor 3, the output shaft of small turbine 1 is connected with the first coupling shaft of multiaxis reduction gear box 8, motor 3 is connected by synchronous automatic clutch 9 with the second coupling shaft of multiaxis reduction gear box 8, the output shaft of multiaxis reduction gear box 8 is connected with induced draught fan 4, and the terminal of motor 3 access auxiliary bus bar 7 by frequency variator 5 and switch 6.
When embodiment one (embodiment three) specifically implements, small turbine adopts high Design of Rotation, as designed maximum speed 6000rpm, adopt the work of 5400rpm fixed rotating speed, motor speed and induced draught fan design speed match, and as adopted design speed to be 745rpm, small turbine is connected by reduction gear box (multiaxis reduction gear box) with motor, keep rotating speed coupling, induced draught fan adopts adjusting rotor blade axial flow fixed rotating speed to run.When induced draught fan starts, first drive induced draught fan from 0 rotating speed raising speed to about 750rpm by small turbine, then motor switch closes a floodgate, induced draught fan rotating speed is stablized by motor access auxiliary bus bar, large movable vane left gradually by induced draught fan, and increase blower fan and exert oneself, small turbine also drives large admission modulating valve gradually, to exert oneself demand, until modulating valve standard-sized sheet to meet induced draught fan.Small turbine and power of motor sum meet induced draught fan TB working condition requirement, induced draught fan power under boiler BRL operating mode (declared working condition) is approximately 2/3rds of TB operating mode, select small turbine valve widely open condition to meet boiler BRL operating mode (also can other power of optimum choice), differential section born by motor.When unit normally runs, small turbine admission modulating valve standard-sized sheet, keeps Effec-tive Function, under the different operating conditions of unit, the power of induced draught fan is different, and the difference of small turbine and axes of blower power, is provided by motor, due to small turbine admission modulating valve standard-sized sheet, do not regulate, when small turbine output power is greater than induced draught fan demand, motor is generator operation state, when small turbine output power can not meet induced draught fan power demand, motor is motor working state.
When embodiment one (embodiment three) specifically implements, can also be in the following way, small turbine adopts high Design of Rotation, adopts variable speed to add constant speed working method, as design maximum speed 6000rpm, motor speed and fan design rotational speed matches, as adopted design speed to be 980rpm, corresponding with small turbine rotating speed 5400rpm, small turbine is connected by reduction gear box (multiaxis reduction gear box) with motor, keep rotating speed coupling, induced draught fan adopts Silence Process axial flow.Select small turbine valve widely open condition to meet boiler BRL operating mode (also can other power of optimum choice), differential section born by motor.Not yet all open at small turbine admission modulating valve, when power can meet independent driving induced draught fan, motor switch is in off state, and induced draught fan is driven separately by small turbine, identical with steam-driven induced draft fan (Silence Process axial flow) method of operation (variable speed regulates) of currently available technology, when small turbine admission modulating valve is close to standard-sized sheet, when induced draught fan reaches rated speed, motor switch closes a floodgate, and induced draught fan enters the constant speed method of operation, by opening large inlet guide vane, increasing induced draught fan and exerting oneself.
When embodiment two (embodiment four) specifically implements, small turbine can adopt high Design of Rotation, adopts variable speed work, as designed maximum speed 6000rpm, motor speed and fan design rotational speed matches, as adopted design speed to be 980rpm, corresponding with small turbine rotating speed 5400rpm, small turbine is connected by reduction gear box (multiaxis reduction gear box) with motor, keep rotating speed coupling, motor is variable-frequency motor, passes through Frequency Converter Control, induced draught fan adopts centrifugal, and variable speed runs.Select small turbine valve widely open condition to meet boiler BRL operating mode (also can other power of optimum choice), differential section born by motor.Not yet all open at small turbine admission modulating valve, when power can meet independent driving induced draught fan, motor switch is in off state, induced draught fan is driven separately by small turbine, identical with steam-driven induced draft fan (centrifugal) method of operation of currently available technology, when small turbine admission modulating valve is close to standard-sized sheet, when induced draught fan about reaches 85% of rated speed, motor switch closes a floodgate, frequency variator drops into, the current rotating speed of tracking motor loads, when small turbine admission modulating valve standard-sized sheet, when induced draught fan is exerted oneself and is needed to increase further, motor will bear under powered part, enter small turbine and motor associating drive condition, blower fan is regulated to exert oneself by frequency variator by controlling motor speed.
When embodiment five (embodiment six) specifically implements, identical when substantially adopting Silence Process axle induced-draft fan (embodiment four) with embodiment three, difference is, multiaxis reduction gear box be provided with synchronous automatic clutch between motor, when motor switch disconnects, synchronous automatic clutch is thrown off, motor is out of service, rotor remains static, and when needs motor is devoted oneself to work, motor switch closes a floodgate, electric motor starting, engaged by synchronous automatic clutch, motor puts into operation, reception load.
Claims (5)
1. the energy-saving type boiler induced draught fan drive system for thermal power plant, it is characterized in that comprising small turbine (1), reduction gear box (2) and motor (3), the output shaft of small turbine (1) is connected with the input shaft of reduction gear box (2), the output shaft of reduction gear box (2) is connected with motor (3), motor (3) is connected with induced draught fan (4), and the terminal of motor (3) are by switch (6) access auxiliary bus bar (7).
2. a kind of energy-saving type boiler induced draught fan drive system according to claim 1, is characterized in that the terminal of motor (3) are connected with switch (6) by frequency variator (5).
3. the energy-saving type boiler induced draught fan drive system for thermal power plant, it is characterized in that comprising small turbine (1), multiaxis reduction gear box (8) and motor (3), the output shaft of small turbine (1) is connected with the first coupling shaft of multiaxis reduction gear box (8), motor (3) is connected with the second coupling shaft of multiaxis reduction gear box, the output shaft of multiaxis reduction gear box is connected with induced draught fan (4), and the terminal of motor (3) are by switch (6) access auxiliary bus bar (7).
4. a kind of energy-saving type boiler induced draught fan drive system for thermal power plant according to claim 3, is characterized in that motor (3) terminal are connected with switch (6) by frequency variator (5).
5., according to claim 3 or a kind of energy-saving type boiler induced draught fan drive system for thermal power plant according to claim 4, it is characterized in that being provided with synchronous automatic clutch (9) between multiaxis reduction gear box (8) and motor (3).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106330055A (en) * | 2016-09-12 | 2017-01-11 | 新疆广汇中化能源技术开发有限公司 | Rotary radiation bed system |
| CN106379154A (en) * | 2016-09-12 | 2017-02-08 | 新疆广汇中化能源技术开发有限公司 | Hybrid driving system |
| 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 |
| CN107131010A (en) * | 2017-04-10 | 2017-09-05 | 西安西热节能技术有限公司 | A kind of power station auxiliary vapour electric hybrid driving, electricity generation system and method |
| CN109026773A (en) * | 2018-07-24 | 2018-12-18 | 安吉县锅炉配件厂 | A kind of adjustable blower unit for boiler fitting production |
| CN109322714A (en) * | 2018-09-30 | 2019-02-12 | 西安陕鼓动力股份有限公司 | SHRT unit frequency-conversion rises the duty control method of steam turbine in Rotation Process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109026773A (en) * | 2018-07-24 | 2018-12-18 | 安吉县锅炉配件厂 | A kind of adjustable blower unit for boiler fitting production |
| CN109322714A (en) * | 2018-09-30 | 2019-02-12 | 西安陕鼓动力股份有限公司 | SHRT unit frequency-conversion rises the duty control method of steam turbine in Rotation Process |
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Application publication date: 20150311 |