CN204851340U - Little steam turbine of backpressure formula of dc generator speed governing drives for water pump system and disposes steam electric power unit of this system - Google Patents
Little steam turbine of backpressure formula of dc generator speed governing drives for water pump system and disposes steam electric power unit of this system Download PDFInfo
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- CN204851340U CN204851340U CN201520439955.7U CN201520439955U CN204851340U CN 204851340 U CN204851340 U CN 204851340U CN 201520439955 U CN201520439955 U CN 201520439955U CN 204851340 U CN204851340 U CN 204851340U
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Abstract
The utility model relates to a little steam turbine of backpressure formula of dc generator speed governing drives for water pump system and disposes steam electric power unit of this system. Particularly, the system includes the little steam turbine of backpressure formula, water -feeding pump and dc generator, wherein, the little steam turbine of backpressure formula the water -feeding pump with the dc generator coaxial coupling, the little steam turbine of backpressure formula is located the water -feeding pump with between the dc generator, perhaps the water -feeding pump is located dc generator with between the little steam turbine of backpressure formula, and the little steam turbine of backpressure formula rotates with the drive the water -feeding pump with dc generator rotates, wherein, through control dc generator's output, thereby control the rotational speed of the little steam turbine of backpressure formula, and then control the rotational speed of water -feeding pump. The system can effectively reduce little steam turbine admission throttling loss and the ability of the little steam turbine of full play acting simultaneously, and then can reduce the running cost by a wide margin and improve power plant economic profit.
Description
Technical field
The utility model relates to steam-turbine power plant, relates to a kind of back pressure type small turbine drive feed-water pump of DC generator speed governing particularly.
Background technique
In Large Copacity high-parameter steam turbine power station, usually configure automobile assembly welding Iine.Use small turbine drive feed water pump, feedwater is improved pressure, supply subsequent technique system.This small turbine can adopt back pressure type.According to the change of unit operation operating mode, need the respective change of exerting oneself of feed water pump, usually met by the respective change of speed of feedwater, and speed of feedwater is determined by the rotating speed of the little steam turbine coaxially connected.
In existing configuration, usually on little steam turbine, configure admission modulating valve, by the aperture of regulating and controlling valve, regulate the rotating speed of little steam turbine, and then meet the requirement of feed water pump (group) rotation speed change.Fig. 1,2,3 is schematic flow sheets of the back pressure type small turbine drive feed-water pump of modulating valve throttle grverning in prior art.In Fig. 1, the little steam turbine of back pressure type is coaxially connected with feed water pump, and little steam turbine entrance is equipped with modulating valve, adjusts the aperture of valve to control the rotating speed of feed water pump by regulating little steam turbine entrance.In Fig. 2, the little steam turbine of back pressure type is coaxially connected with feed water pump group, feed water pump group is made up of front-mounted pump and feed water pump, front-mounted pump and feed water pump lay respectively at the two ends of little steam turbine, wherein front-mounted pump needs reduction gear box is housed according to rotating speed coupling, adjusts the aperture of valve to control the rotating speed of feed water pump group by regulating little steam turbine entrance.In Fig. 3, the little steam turbine of back pressure type is coaxially connected with feed water pump group, feed water pump group is made up of front-mounted pump and feed water pump, front-mounted pump and feed water pump are positioned at same one end of little steam turbine, wherein front-mounted pump needs reduction gear box is housed according to rotating speed coupling, adjusts the aperture of valve to control the rotating speed of feed water pump group by regulating little steam turbine entrance.
Completely send out to meet long-term summer unit, the nominal output of little steam turbine is usually large than the nominal output of feed water pump, and the nominal output of feed water pump is larger than exerting oneself required for unit rated load, therefore the nominal output of little steam turbine has larger allowance, is generally more than 20%.Such as to 1 1000MW ultra supercritical unit, the automobile assembly welding Iine of usual configuration 2 50% capacity, the declared working condition power demand of feed water pump is about 17000kW, and supporting small turbine maximum output is about 22000kW, every platform unit small turbine exerts oneself allowance for (22000-17000) x2=10000kW.
This configuration causes little steam turbine admission modulating valve aperture most working time less, and its common aperture, below 60%, affects little steam turbine operational efficiency more than 5%, causes larger restriction loss.In addition, due to generator set load with electrical network demand every day in lifting, when low-load, the tune valve opening of little steam turbine can be less, small turbine is exerted oneself and is all underused, and the small turbine of every platform unit does not on average utilize power to be more than 10000kW, there is larger economic loss.
Therefore, related domain be badly in need of exploitation a kind of can effectively reduce little steam turbine admission restriction loss and can give full play to simultaneously little steam turbine acting ability novel back pressure type small turbine drive feed-water pump.
Model utility content
The purpose of this utility model is to provide a kind of and can effectively reduces little steam turbine admission restriction loss and can give full play to the novel back pressure type small turbine drive feed-water pump of little steam turbine acting ability simultaneously.
First aspect of the present utility model, provide a kind of back pressure type small turbine drive feed-water pump of DC generator speed governing, described system comprises the little steam turbine of back pressure type, feed water pump and DC generator, wherein,
The little steam turbine of described back pressure type, described feed water pump are coaxially connected with described DC generator;
The little steam turbine of described back pressure type is between described feed water pump and described DC generator, or described feed water pump is between described DC generator and the little steam turbine of described back pressure type; And
The little steam turbine of described back pressure type rotates to drive described feed water pump and described DC generator to rotate; Wherein, by controlling the output of described DC generator, thus control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
In another preference, described feed water pump is directly connected with the little steam turbine of described back pressure type.
In another preference, the little steam turbine of described back pressure type is provided with admission pipeline, and described admission pipeline is provided with modulating valve.
In another preference, aperture >=80% of described modulating valve, preferably >=90% is more preferably >=99% (as 100%).
In another preference, the little steam turbine of described back pressure type is also provided with blow-off line.
In another preference, described blow-off line is connected with heater or heat supply network.
In another preference, the little steam turbine of described back pressure type is also provided with extraction line.
In another preference, described extraction line is connected with heater or heat supply network.
In another preference, the progression that draws gas of described extraction line is more than 0,1,2 or 2 grade.
In another preference, the air pressure of described heater or heat supply network is higher than barometric pressure.
In another preference, described system also comprises constant-speed ratio gear-box, for mating the rotating speed between the little steam turbine of described back pressure type, described DC generator and/or described feed water pump.
In another preference, when the little steam turbine of described back pressure type is between described feed water pump and described DC generator, described DC generator is connected with the little steam turbine of described back pressure type through described constant-speed ratio gear-box.
In another preference, when described feed water pump is between described DC generator and the little steam turbine of described back pressure type, described constant-speed ratio gear-box is between described feed water pump and described DC generator.
In another preference, described constant-speed ratio gear-box has clutch function.
In another preference, described system also comprises clutch.
In another preference, described clutch is between described DC generator and the little steam turbine of described back pressure type.
In another preference, all or part of direct supply direct current user of the direct current that described DC generator sends.
In another preference, described system also comprises inverter, and all or part of direct current that described inverter is used for described DC generator being sent changes into electrical network with power frequency electric frequently.
In another preference, the power frequency electric changing gained through described inverter directly supplies in factory or factory's external power grid.
In another preference, described system also comprises transformer, and described transformer is connected with described inverter, for the voltage transformation of the power frequency electric by changing gained through described inverter to the voltage matched with electrical network.
In another preference, described system also comprises front-mounted pump.
In another preference, between described front-mounted pump and the little steam turbine of described back pressure type, be provided with constant-speed ratio gear-box.
In another preference, when the little steam turbine of described back pressure type is between described feed water pump and described DC generator, described front-mounted pump is connected with described feed water pump through described constant-speed ratio gear-box.
In another preference, when described feed water pump is between described DC generator and the little steam turbine of described back pressure type, described front-mounted pump is connected with described feed water pump through described constant-speed ratio gear-box and/or described DC generator.
Second aspect of the present utility model, provides a kind of steam electric power unit, and described generator set is configured with the back pressure type small turbine drive feed-water pump of the DC generator speed governing described in the utility model first aspect.
Should be understood that within the scope of the utility model, above-mentioned each technical characteristics of the present utility model and can combining mutually between specifically described each technical characteristics in below (eg embodiment), thus form new or preferred technological scheme.As space is limited, tiredly no longer one by one to state at this.
Reference character
1: the little steam turbine of back pressure type
2: feed water pump
3: front-mounted pump
4: DC generator
5: constant-speed ratio gear-box
6: inverter
7: transformer
8: modulating valve
9: clutch
Accompanying drawing explanation
Fig. 1,2,3 is schematic flow sheets of the back pressure type small turbine drive feed-water pump of modulating valve throttle grverning in prior art.
Fig. 4 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 1.
Fig. 5 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 2.
Fig. 6 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 3.
Fig. 7 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 4.
Fig. 8 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 5.
Fig. 9 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 6.
Embodiment
The present inventor is through long-term and deep research, be surprised to find that by setting up the DC generator be coaxially connected with small turbine and feed water pump group on existing back pressure type small turbine drive feed-water pump, the restriction loss that can effectively reduce small turbine can give full play to little steam turbine acting ability simultaneously, and then significantly can reduce operating cost and improve power station economic well-being of workers and staff.On this basis, inventor completes the utility model.
Term
As used herein, term " little steam turbine ", " small turbine " or " the little steam turbine of back pressure type " are used interchangeably, and all refer to that steam discharge arrives the steam turbine higher than atmospheric heat exchanger or heat supply network.
As used herein, term " DC generator " or " generator " are used interchangeably, and all refer to that sent electricity is galvanic generator.
As used herein, term " reduction gear box ", " gear-box " or " constant-speed ratio gear-box " are used interchangeably.
As used herein, term " heat exchanger " or " heater " are used interchangeably.
System
The utility model provides a kind of back pressure type small turbine drive feed-water pump of DC generator speed governing, and described system comprises the little steam turbine of back pressure type, feed water pump and DC generator, wherein,
The little steam turbine of described back pressure type, described feed water pump are coaxially connected with described DC generator;
The little steam turbine of described back pressure type is between described feed water pump and described DC generator, or described feed water pump is between described DC generator and the little steam turbine of described back pressure type; And
The little steam turbine of described back pressure type rotates to drive described feed water pump and described DC generator to rotate; Wherein, by controlling the output of described DC generator, thus control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
In another preference, described feed water pump is directly connected with the little steam turbine of described back pressure type.
Usually, the little steam turbine of described back pressure type is provided with admission pipeline, and described admission pipeline is provided with modulating valve.
In the utility model, the aperture of described modulating valve can be very large, thus significantly can reduce restriction loss.
Typically, aperture >=80% of described modulating valve, preferably >=90% is more preferably >=99% (as 100%).
In another preference, the little steam turbine of described back pressure type is also provided with blow-off line.
In another preference, described blow-off line is connected with heater or heat supply network.
In another preference, the little steam turbine of described back pressure type is also provided with extraction line.
In another preference, described extraction line is connected with heater or heat supply network.
In another preference, the progression that draws gas of described extraction line is not particularly limited, and is preferably more than 0,1,2 or 2 grade.
In another preference, the air pressure of described heater or heat supply network is higher than barometric pressure.
Usually, described system also comprises constant-speed ratio gear-box, for mating the rotating speed between the little steam turbine of described back pressure type, described DC generator and/or described feed water pump.
In the utility model, the position of described constant-speed ratio gear-box is not particularly limited, and can in very large range adjust.
Typically, when the little steam turbine of described back pressure type is between described feed water pump and described DC generator, described DC generator is connected with the little steam turbine of described back pressure type through described constant-speed ratio gear-box.
Typically, when described feed water pump is between described DC generator and the little steam turbine of described back pressure type, described constant-speed ratio gear-box is between described feed water pump and described DC generator.
In another preference, described constant-speed ratio gear-box has clutch function.
Usually, described system also comprises clutch.
In the utility model, the position of described clutch is not particularly limited, and can in very large range adjust.
Typically, described clutch is between described DC generator and the little steam turbine of described back pressure type.
In another preference, all or part of direct supply direct current user of the direct current that described DC generator sends.
In the utility model, described system also comprises inverter, and all or part of direct current that described inverter is used for described DC generator being sent changes into electrical network with power frequency electric frequently.
In another preference, the power frequency electric changing gained through described inverter directly supplies in factory or factory's external power grid.
In the utility model, described system also comprises transformer, and described transformer is connected with described inverter, for the voltage transformation of the power frequency electric by changing gained through described inverter to the voltage matched with electrical network.
In the utility model, described system also comprises front-mounted pump.
Usually, between described front-mounted pump and the little steam turbine of described back pressure type, be provided with constant-speed ratio gear-box, for mating the rotating speed between described front-mounted pump and described system.
In the utility model, the position of described front-mounted pump is not particularly limited, and can in very large range adjust.
Typically, when the little steam turbine of described back pressure type is between described feed water pump and described DC generator, described front-mounted pump is connected with described feed water pump through described constant-speed ratio gear-box.
Typically, when described feed water pump is between described DC generator and the little steam turbine of described back pressure type, described front-mounted pump is connected with described feed water pump through described constant-speed ratio gear-box and/or described DC generator.
A kind of typical case of back pressure type small turbine drive feed-water pump of DC generator speed governing is composed as follows:
1) the little steam turbine of back pressure type, comprises admission pipeline and modulating valve, blow-off line, extraction line (extraction line is optional, can be more than 0,1,2 or 2 grade);
2) feed water pump group can be feed water pump equipment (Fig. 4,5,9), and also can be front-mounted pump and feed water pump two equipment (Fig. 6,7,8), the utility model technology also can be applicable to other high powered water pump;
3) DC generator, can be positioned at little steam turbine axle two ends with feed water pump group, also can be positioned at same axle head; When being positioned at same one end, DC generator between feed water pump and front-mounted pump, also can be able to be positioned at outside front-mounted pump;
4) constant-speed ratio gear-box, mates rotating speed between above equipment.Described constant-speed ratio gear-box can comprise clutch function, may also be only clutch (Fig. 9);
5) inverter, becomes the direct current of DC generator with electrical network with power frequency electric frequently;
6) transformer, optional, for electric transformation that DC generator is sent to the voltage matched with electrical network.
In the utility model, in axle system, the rotating speed of feed water pump is generally change, and the rotating speed of little steam turbine changes thereupon.When joining the industrial frequency generator of constant speed in prior art in systems in which, needing to configure arrangements for speed regulation between industrial frequency generator and little steam turbine, is the constant speed that industrial frequency generator needs by the change rotational speed regulation of little steam turbine.And the cost of arrangements for speed regulation is higher, and its transmission efficiency is generally below 95%.In the utility model, change in the system and join DC generator, its input speed can be become, and does not need arrangements for speed regulation between little steam turbine, relatively can reduce engineering cost, and improve axle system whole efficiency.
Application
The utility model additionally provides a kind of steam electric power unit, and described generator set is configured with the back pressure type small turbine drive feed-water pump of described DC generator speed governing.
Compared with prior art, the utility model has following major advantage:
(1) effectively can reduce the loss of little steam turbine admission throttling, improve operational efficiency;
(2) operating cost and engineering cost can effectively be reduced, the discharge of contaminant reducing, protection of the environment;
(3) the acting ability of little steam turbine can be given full play to, increase and run income.
Below in conjunction with specific embodiment, set forth the utility model further.Should be understood that these embodiments are only not used in restriction scope of the present utility model for illustration of the utility model.The experimental technique of unreceipted actual conditions in the following example, the usually conveniently conditioned disjunction condition of advising according to manufacturer.Unless otherwise indicated, otherwise percentage and number calculate by weight.
Unless otherwise defined, all specialties used in literary composition and scientific words and one skilled in the art the meaning be familiar with identical.In addition, any method similar or impartial to described content and material all can be applicable in the utility model method.The use that better implementation methods described in literary composition and material only present a demonstration.
Embodiment 1
Fig. 4 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 1.
In the diagram, when normally running, the little steam turbine of back pressure type adjusts valve to keep comparatively large (or standard-sized sheet) aperture, high pressure steam enters little steam turbine, low pressure steam discharge after acting is to the heat user such as heater, heat supply network, and Steam Actuation small turbine rotates, thus drags coaxial feed water pump rotation.The little steam turbine of back pressure type as required, can be joined more than 0,1,2 or 2 grade and draws gas, for the heat user such as heater, heat supply network.
Another axle head of the little steam turbine of back pressure type drags DC generator, can match constant-speed ratio gear-box as required between little steam turbine and DC generator.The direct current that DC generator sends can direct all or part of supply direct current user, also fully or partially through inverter, can become the power frequency electric of mating with electrical network, in supply factory or factory's external power grid.If voltage is different between DC generator from electrical network, can transformer be set, by electricity transformation to the voltage mated with electrical network.
By controlling exerting oneself of DC generator, modulating valve throttle style can be replaced, controlling the rotating speed of small turbine, thus efficiently meeting speed of feedwater control overflow.
Result
Adopt this technology, the restriction loss of little steam turbine admission modulating valve can be reduced, the aperture of modulating valve is remained on large aperture for a long time, improve little steam turbine operational efficiency.The acting ability of small turbine can be made full use of simultaneously, generated electricity by DC generator, externally can power morely, improve power plant's sale of electricity income.
Such as, to 1 1000MW ultra supercritical unit, adopt the utility model, the control valve opening of little steam turbine can remain on 100% for a long time, remarkable minimizing restriction loss, little steam turbine operational efficiency can improve more than 5%, saves mark more than 5000 tons, coal year, significantly can reduce operating cost, and reach the comprehensive benefit of decreasing pollution thing discharge; In addition, the acting ability of small turbine can be made full use of, generated electricity by DC generator, can externally power 7,500 ten thousand kilowatts morely every year, direct economy income more than 1,500 ten thousand yuan.
Embodiment 2
With embodiment 1, difference is: DC generator and feed water pump are positioned at the same axle head of little steam turbine.
Result
Fig. 5 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 2.
To speed discrepancy apart from larger feed water pump and DC generator, adopt this programme, between feed water pump and DC generator, configure constant-speed ratio gear-box, the technical feasibility of Practical Project can be improved.
Embodiment 3
With embodiment 1, difference is: feed water pump group is made up of front-mounted pump and feed water pump.
Result
Fig. 6 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 3.
Adopt this programme, with little steam turbine coaxial drive feed water pump and front-mounted pump, replace independent driving feed water pump, externally can power morely, improve power plant's sale of electricity income.
Embodiment 4
With embodiment 2, difference is: feed water pump group is made up of front-mounted pump and feed water pump, and DC generator is between feed water pump and front-mounted pump.
Result
Fig. 7 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 4.
As DC generator, feed water pump are close with front-mounted pump rotating speed, can adopt this programme, 1 gear-box is joined by axle system, relatively joins Fig. 6 scheme of 2 gear-boxes, can reduce construction investment.
Embodiment 5
With embodiment 2, difference is: feed water pump group is made up of front-mounted pump and feed water pump, and DC generator is positioned at outside front-mounted pump.
Result
Fig. 8 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 5.
This programme is compared with Fig. 7 scheme, and DC generator is positioned at axle system termination, is convenient to electrical wiring.
Embodiment 6
With embodiment 1, difference is: described constant-speed ratio gear-box is only clutch.
Result
Fig. 9 is the schematic flow sheet of the back pressure type small turbine drive feed-water pump of the DC generator speed governing of the utility model embodiment 6.
Clutch is joined between the little steam turbine of this programme and generator, if break down in DC generator side in operation, can by clutch by DC generator side off-the-line, little steam turbine continues to drive feed water pump to run, avoid the stoppage in transit causing overall unit, thus reliability of operation is provided.
In sum, the throttle grverning problem that the utility model exists for existing back pressure type small turbine drive feed water pump technology, the newly-increased DC generator be coaxially connected with back pressure type small turbine drive feed water pump group, speed of feedwater is regulated by controlling exerting oneself of DC generator, not only can reduce the loss of little steam turbine admission throttling, and exerting oneself of little steam turbine can be made full use of, by the multiple electricity of DC generator, improve the sale of electricity income of power plant.
The all documents mentioned at the utility model are quoted as a reference all in this application, are just quoted separately as a reference as each section of document.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after having read above-mentioned instruction content of the present utility model.
Claims (9)
1. a back pressure type small turbine drive feed-water pump for DC generator speed governing, is characterized in that, described system comprises the little steam turbine of back pressure type, feed water pump and DC generator, wherein,
The little steam turbine of described back pressure type, described feed water pump are coaxially connected with described DC generator;
The little steam turbine of described back pressure type is between described feed water pump and described DC generator, or described feed water pump is between described DC generator and the little steam turbine of described back pressure type; And
The little steam turbine of described back pressure type rotates to drive described feed water pump and described DC generator to rotate; Wherein, by controlling the output of described DC generator, thus control the rotating speed of the little steam turbine of described back pressure type, and then control the rotating speed of described feed water pump.
2. the system as claimed in claim 1, is characterized in that, the little steam turbine of described back pressure type is provided with admission pipeline, and described admission pipeline is provided with modulating valve.
3. the system as claimed in claim 1, is characterized in that, the little steam turbine of described back pressure type is also provided with extraction line.
4. the system as claimed in claim 1, is characterized in that, described system also comprises constant-speed ratio gear-box, for mating the rotating speed between the little steam turbine of described back pressure type, described DC generator and/or described feed water pump.
5. the system as claimed in claim 1, is characterized in that, described system also comprises clutch.
6. the system as claimed in claim 1, is characterized in that, described system also comprises inverter, and all or part of direct current that described inverter is used for described DC generator being sent changes into electrical network with power frequency electric frequently.
7. system as claimed in claim 6, it is characterized in that, described system also comprises transformer, and described transformer is connected with described inverter, for by the voltage transformation of the power frequency electric through described inverter transformation gained to the voltage matched with electrical network.
8. the system as claimed in claim 1, is characterized in that, described system also comprises front-mounted pump.
9. a steam electric power unit, is characterized in that, described generator set is configured with the back pressure type small turbine drive feed-water pump of DC generator speed governing according to claim 1.
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| CN201520439955.7U CN204851340U (en) | 2015-06-24 | 2015-06-24 | Little steam turbine of backpressure formula of dc generator speed governing drives for water pump system and disposes steam electric power unit of this system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110894796A (en) * | 2019-11-06 | 2020-03-20 | 大唐郓城发电有限公司 | Steam extraction back pressure type small steam turbine control and regulation system and method with power balance generator |
| CN113107616A (en) * | 2021-04-14 | 2021-07-13 | 湖南省湘电试验研究院有限公司 | BEST small steam turbine system and application method thereof |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110894796A (en) * | 2019-11-06 | 2020-03-20 | 大唐郓城发电有限公司 | Steam extraction back pressure type small steam turbine control and regulation system and method with power balance generator |
| CN113107616A (en) * | 2021-04-14 | 2021-07-13 | 湖南省湘电试验研究院有限公司 | BEST small steam turbine system and application method thereof |
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