CN206845410U - A kind of high and low rotating speed steam feed pump system - Google Patents
A kind of high and low rotating speed steam feed pump system Download PDFInfo
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- CN206845410U CN206845410U CN201720403738.1U CN201720403738U CN206845410U CN 206845410 U CN206845410 U CN 206845410U CN 201720403738 U CN201720403738 U CN 201720403738U CN 206845410 U CN206845410 U CN 206845410U
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- feed pump
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Abstract
The utility model discloses a kind of high and low rotating speed steam feed pump system, and it comprises at least the adjustable slow-speed of revolution feed pump turbine of rotating speed, step-up gear and high rotating speed feed pump.As unit load changes, into the amount of drawing gas and parameter the meeting respective change of the feed pump turbine, the turbine speed synchronously changes, and drives feed pump indirectly by step-up gear, and feed pump, feed pump turbine can be achieved to the flexible designs of respective different optimum speeds.
Description
Technical field
The utility model is applied to power field, more particularly to a kind of high and low rotating speed steam feed pump system.
Background technology
Growing with Coal-fired Thermal Power technology, capacity of power unit is improved constantly, and capacity of power unit has been sent out at present
Exhibition to gigawatt and more than.And capacity of power unit is bigger, corresponding subsidiary engine place capacity is also bigger, the economy of subsidiary engine equipment
Property also seems more and more important, by taking feed pump as an example, on the one hand, feed pump is driven using feed pump turbine mostly at present,
It has the advantages that excellent speed governing, high efficiency, high power factor and power savings, is then requirement lifting feedwater on the other hand
The internal efficiency of pump, feed pump turbine.In fact, for feed pump, feed pump turbine, both are because of manufacturing process, level
Difference be that there is different characteristics to rotating speed requirement, feed pump requires relatively high rotating speed, in the rotating speed being commonly designed at present
In the range of, revolution speed is higher, and the efficiency of pump is higher, while the diameter of pump also can be smaller, can so as to the manufacturing cost of feed pump
Reduce；In addition, pump case also can be thinner, so as to start and varying duty adaptability is stronger；And feed pump turbine, then require relatively low
Rotating speed, turbine speed is lower, and its steam discharge leaving loss is also lower, relative to obtain higher internal efficiency, in addition, can adopt
With longer exhaust stage blade, the more abundant leaving area of acquirement, thus its exhaust steam pressure can also be accomplished relatively lower.Traditional
In Small And Medium Capacity unit, because the feed pump turbine rotating speed different from feed pump requires that property difference does not highlight still, both
Design of Rotation is typically to meet each other half way and be directly connected.
However, with the continuous increase of unit capacity, feedwater pump capacity is relatively large, single by taking 1000MW units as an example
Platform feed pump design power about 38MW, rotating speed is typically in 4500~5300rpm, if still using mode is joined directly together, to feedwater
For mercury vapour turbine, after capacity boost, the factors such as cylinder structure, blade strength are limited by, are especially limited by under rotating at a high speed,
The high stress of linear leaf root caused by high centrifugal force, the length of exhaust stage blade and the leaving area of steam turbine are restricted, and are given
Exhaust steam pressure of the water pump steam turbine under declared working condition will be very high, so, not only less economical, or even is difficult to turn with feed pump
Speed is matched, it is seen that this mode being joined directly together, its reasonability have not existed.It is average especially in high latitude area
Temperature is low, if the exhaust steam pressure of feed pump turbine can be reduced to the level to match with environmental condition, it enters vapour（Main steamer
Machine draws gas）Effective enthalpy drop can dramatically increase, so as to make its performance driving economy be increased dramatically.
In view of the above-mentioned deficiency of prior art, the purpose of this utility model is to provide a kind of low cost, high applicability, Gao Ke
By property, efficient high and low rotating speed steam feed pump system.
The content of the invention
A kind of high and low rotating speed steam feed pump system provided by the utility model, including the adjustable slow-speed of revolution feed pump of rotating speed
Steam turbine, high rotating speed feed pump and step-up gear；Characterized in that, the feed pump turbine passes through the step-up gear
The feed pump is driven indirectly.
Characterized in that, also include fore pump, reduction gear box, the fore pump by the reduction gear box with it is described
Feed pump turbine connects, and the fore pump is arranged in the both sides of the feed pump turbine with the feed pump
Further, it is characterised in that the step-up gear forms a composite teeth roller box with the reduction gear box,
The feed pump turbine is connected with the fore pump, the feed pump being connected in parallel respectively by the composite teeth roller box,
The feed pump is connected with the speedup side of the composite teeth roller box, and the deceleration side of the fore pump and the composite teeth roller box connects
Connect.
A kind of high and low rotating speed feed pump turbine system provided by the utility model, mainly has the following advantages that：1st, this reality
High rotating speed feed pump is indirectly connected with slow-speed of revolution feed pump turbine using step-up gear with new, may be such that both
Design of Rotation it is very flexible, can be designed completely according to each optimal speed demand, thus, speed of feedwater can design
Must be of a relatively high, so, the of a relatively high efficiency of pump can be not only obtained, and the diameter of pump diminishes relatively, feed pump is manufactured into
This relative reduction, pump case is thinning, starts and varying duty adaptability improves relatively；And feed pump turbine rotating speed can then design relatively
It is relatively low, the not only limitation of break through capacity, higher internal efficiency can be also realized, obtain lower exhaust steam pressure, thus with more preferable
Performance driving economy.2nd, the utility model further can include fore pump within system, by reduction gear box it is mechanical between
Driving fore pump is connect, is not using the electron electric power frequency converter of any pattern, so that it may realizes that fore pump variable speed is run, with routine
" power frequency driving fore pump " mode compares, and has the advantages such as performance driving economy is good, reliability is high, meanwhile, fore pump is also used and given
Water pump steam turbine drives so that therefore steam turbine capacity relative increase, its internal efficiency also get a promotion.
Design, concrete structure and caused technique effect of the present utility model are made furtherly below with reference to accompanying drawing
It is bright, to be fully understood from the purpose of this utility model, feature and effect.
Reference
Fig. 1, Fig. 2, Fig. 3 are the system schematics of specific embodiment of the utility model；
Marked in figure：1：Feed pump；2：Step-up gear；3：Feed pump turbine；4：Reduction gear box；5：Fore pump；
6：Composite teeth roller box.
Embodiment
Embodiment 1
As shown in figure 1, a kind of specific embodiment of high and low rotating speed steam feed pump system of the present utility model, it includes giving
Water pump steam turbine 3, feed pump 1, step-up gear 2.As unit load changes, corresponding regulation（Change）Into the steam turbine
Steam parameter and the amount of drawing gas, make the turbine speed respective change, so as to change speed of feedwater indirectly by gear-box.
Slow-speed of revolution feed pump turbine under the utility model, for relatively high-revolving feed pump turbine, due to it
Rotating speed is low, can choose longer exhaust stage blade, obtains more abundant leaving area, so as to obtain lower exhaust steam pressure, with
Exemplified by certain 1350MW unit, its feed pump turbine capacity requirement reaches 53MW, and current feed pump turbine manufacturing process, if
Using the high-revolving feed pump turbine of tradition, single feed pump turbine of 100% capacity cannot be realized at all, is this tradition side
Case can only then use the feed pump turbine of two 50% capacity, and so not only investment increase, economy are also poor.And according to this
The slow-speed of revolution steam feed pump system of utility model, then feed pump turbine can be designed completely according to itself optimum speed, adopt
With relatively low rotating speed, for example, the rotating speed of feed pump turbine may be designed as 3000rpm or lower, list is so not only breached
The limitation of feed pump turbine capacity, it is also possible that therefore the internal efficiency of feed pump turbine is lifted, its exhaust steam pressure
It can be made lower；Likewise, speed of feedwater is then completely unrestricted, can be also designed according to itself optimum speed, example
Such as 6000rpm or higher.Multi-efficiency so can be achieved, on the one hand, feed pump internal efficiency relative can improve about because rotating speed improves
1%, on the other hand, the internal efficiency of feed pump turbine can also improve 2%, and its exhaust steam pressure can reduce about 2KPa, certainly, by
In being provided with step-up gear between the two, this can have certain loss in efficiency, but due to the development of gear box technology, at present
The efficiency of gear-box is up to 99.5%, i.e. gear-box has about 0.5% loss in efficiency.The influence of the aspect of summary three, folding
Unit coal consumption is counted as, can therefore decline about 0.5g/kWh.
Embodiment 2
As shown in Fig. 2 a kind of another specific embodiment of high and low rotating speed steam feed pump system of the present utility model, it is wrapped
Include feed pump turbine 3, feed pump 1, step-up gear 2, fore pump 5, reduction gear box 4.As unit load changes, accordingly
Regulation（Change）Into the steam parameter of the feed pump turbine and the amount of drawing gas, make the turbine speed respective change, so as to logical
Cross the rotating speed that gear-box changes feed pump and fore pump indirectly.
Compared with Example 1, the embodiment is additionally arranged reduction gear box and preposition pumping system.The program includes fore pump
High and low rotating speed feed pump turbine system.Therefore, in low- load conditions, compared to more conventional power frequency drive arrangement mode, the party
Case can not only realize that each operating mode of fore pump is in the running of relative efficiency area, improve its economy, and greatly reduce power frequency electric
The electric fault risk that source is brought, improve the reliability of system operation.Meanwhile program relative increase feed pump turbine
Capacity, therefore the internal efficiency of feed pump turbine is accordingly improved.
Embodiment 3
As shown in figure 3, a kind of another specific embodiment of high and low rotating speed steam feed pump system of the present utility model, it is wrapped
Include feed pump turbine 3, feed pump 1, fore pump 5, composite teeth roller box 6.As unit load changes, corresponding regulation（Change）Enter
Enter the steam parameter and the amount of drawing gas of the feed pump turbine, make the feed pump turbine rotating speed respective change, so as to pass through gear
Case changes the rotating speed of feed pump and fore pump indirectly.
Compared with embodiment two, the embodiment by " one input two output " composite teeth roller box by fore pump and feed pump simultaneously
Steam turbine side is associated in, i.e.,：Input connects steam turbine, two output ends difference directly feed pump and fore pump in parallel.The implementation
Example utilizes a composite teeth roller box, and cost of investment is relatively low, can also realize feed pump, fore pump homonymy arrangement in addition, leave
The opposite side space of feed pump turbine.
Specific embodiment of the utility model described in detail above.It should be appreciated that the ordinary skill of this area is without wound
The property made work can makes many modifications and variations according to design of the present utility model.Therefore, all technologies in the art
Personnel can be obtained by logical analysis, reasoning, or a limited experiment on the basis of existing technology according to design of the present utility model
The technical scheme arrived, all should be in the protection domain being defined in the patent claims.
Claims (3)
1. a kind of high and low rotating speed steam feed pump system, including the feedwater of the adjustable slow-speed of revolution feed pump turbine of rotating speed, high rotating speed
Pump and step-up gear, it is characterised in that the slow-speed of revolution feed pump turbine drives institute indirectly by the step-up gear
State high rotating speed feed pump.
2. a kind of high and low rotating speed steam feed pump system as claimed in claim 1, it is characterised in that also including fore pump, subtract
Fast gear-box, the fore pump are connected by the reduction gear box with the feed pump turbine, the fore pump with it is described
Feed pump is arranged in the both sides of the feed pump turbine.
A kind of 3. high and low rotating speed steam feed pump system as claimed in claim 2, it is characterised in that the step-up gear with
The reduction gear box forms a composite teeth roller box, the feed pump turbine by the composite teeth roller box respectively with it is in parallel
The fore pump, the high rotating speed feed pump of connection are connected, and the feed pump is connected with the speedup side of the composite teeth roller box,
The fore pump is connected with the deceleration side of the composite teeth roller box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720403738.1U CN206845410U (en) | 2017-04-18 | 2017-04-18 | A kind of high and low rotating speed steam feed pump system |
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| CN201720403738.1U CN206845410U (en) | 2017-04-18 | 2017-04-18 | A kind of high and low rotating speed steam feed pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044397A (en) * | 2017-04-18 | 2017-08-15 | 上海申能电力科技有限公司 | A kind of high and low rotating speed steam feed pump system |
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2017
- 2017-04-18 CN CN201720403738.1U patent/CN206845410U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107044397A (en) * | 2017-04-18 | 2017-08-15 | 上海申能电力科技有限公司 | A kind of high and low rotating speed steam feed pump system |
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