CN201696101U - Full admission steam turbine generator unit - Google Patents
Full admission steam turbine generator unit Download PDFInfo
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- CN201696101U CN201696101U CN2010202266825U CN201020226682U CN201696101U CN 201696101 U CN201696101 U CN 201696101U CN 2010202266825 U CN2010202266825 U CN 2010202266825U CN 201020226682 U CN201020226682 U CN 201020226682U CN 201696101 U CN201696101 U CN 201696101U
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- frequency modulation
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Abstract
The utility model relates to a full admission steam turbine generator unit, which comprise a steam turbine, a generator and a heater, wherein the steam turbine is used for driving the generator; the steam turbine is provided with a main steam inlet pipeline and at least one steam extraction pipeline; the heater is connected with the steam turbine through the steam extraction pipeline; at least part of steam extraction pipeline is provided with frequency modulation regulating valves, and the frequency modulation regulating valves regulate the output power of the generator through regulating the work-application steam flow in the steam cylinder of the steam turbine to stabilize the frequency of a power grid. Due to the fact that the primary frequency modulation task of the unit is borne by the frequency modulation regulating valves, a main steam regulating steam valve can be in 100% opening all along, the throttle loss of the main steam regulating steam valve is greatly reduced and the efficiency of the unit is improved. Moreover, the regulating mode can greatly reduce the main steam flow disturbances in the steam cylinder.
Description
Technical field
The utility model relates to a kind of frequency modulation technology of Turbo-generator Set, especially relates to the full admission Turbo-generator Set of primary frequency modulation.
Background technique
In order to guarantee the safety and economic operation of electrical network, improve the controlling level of the quality of power supply and mains frequency, eliminate rapidly owing to network load changes the frequency fluctuation that causes, electrical network generally all requires the Turbo-generator Set of networking to possess the ability of primary frequency modulation, and promptly requiring Turbo-generator Set to possess increases or reduce a certain amount of ability of exerting oneself and descending or rising with quick responsive electricity grid frequency in the short period of time.
In the prior art, the admission control type of uniform-admission turbine generally can be divided into two types of throttling adjusting and filling valve regulation.
Regulate with throttling, the Turbo-generator Set schematic representation that the employing throttling is regulated as shown in Figure 1.Main steam shut-off valve 14 standard-sized sheets, the single-conversion of unit all are to realize by the aperture that changes steam turbine main steam adjusting steam valve 13.In order to guarantee the primary frequency modulation function, main steam is regulated steam valve 13 can not 100% standard-sized sheet, must keep 5%～15% aperture (being that valve only opens 95%～85%).When mains frequency was too high, the control system of unit suitably turned down main steam immediately and regulates steam valve, reduced to enter the steam flow of steam turbine 11, reduced exerting oneself of generator 12, electric power grid frequency stabilization.Cross when low when mains frequency, the control system of unit is suitably opened big main steam immediately and is regulated steam valve 13, increases the steam flow that enters steam turbine 11, increases the electric power grid frequency stabilization of exerting oneself of generator 12.
Above-mentioned throttling regulative mode needs that for the ability that keeps primary frequency modulation main steam is regulated steam valve and keeps 5%～15% aperture (being that valve only opens 95%～85%), the steam of full flow forms restriction loss when regulating steam valve by main steam, thereby will reduce the efficient of whole Turbo-generator Set, and this loss will exist all in the unit whole service time.
In addition, the Turbo-generator Set schematic representation of employing filling valve regulation as shown in Figure 2.Main steam shut-off valve 24 and main steam are regulated steam valve 23 standard-sized sheets, when unit normally moves, filling valve 25 is in closed condition, when mains frequency is too high, the control system of unit suitably turns down main steam immediately and regulates steam valve 23, reduces to enter the steam flow of steam turbine 21, reduces unit output, that reduces generator 22 exerts oneself electric power grid frequency stabilization.When mains frequency is crossed when low, the control system of unit is suitably opened the filling valve immediately, directly enter the steam turbine intergrade after making the part initial steam by the throttling of filling valve, increasing the steam flow of work done in the steam turbine, thereby reach the purpose of the electric power grid frequency stabilization of exerting oneself that increases generator 22.
Above-mentioned filling valve regulation mode is when primary frequency modulation need increase steam turbine when exerting oneself, open the filling valve and directly introduce the steam turbine intergrade after with the throttling of part initial steam, increasing steam flow, but the bigger restriction loss of existence like this, increase the hear rate of unit greatly, reduce the unit whole efficiency.And steam flow produces bigger disturbance in the steam steam flow countercylinder of mend, and can increase the vibration of steam turbine, thisly vibrates senior general and jeopardizes unit safety operation.
The model utility content
Purpose of the utility model provides a kind of full admission Turbo-generator Set, main steam can be regulated steam valve and keep 100% aperture always, reduces main steam and regulates the steam valve restriction loss, and can produce disturbance to steam turbine inside steam flow hardly.
For this reason, an aspect of the present utility model proposes a kind of full admission Turbo-generator Set, comprises steam turbine, generator and heater, and steam turbine is in order to drive generator, steam turbine is provided with main steam lead road and at least one road extraction line, and heater connects steam turbine by extraction line.The frequency modulation modulating valve that the steam flow of work done is exerted oneself with regulator generator in being provided with by the cylinder of regulating steam turbine to the small part extraction line wherein.
In an embodiment of the present utility model, the main steam lead road is provided with main steam and regulates steam valve.
In an embodiment of the present utility model, also be provided with the main steam Shuttoff Valve on the main steam lead road.
In an embodiment of the present utility model, the main steam lead road can be one the tunnel or multichannel.
In an embodiment of the present utility model, steam turbine can be single casing steam turbine or multi-cylinder turbine.
Above-mentioned full admission Turbo-generator Set workflow is as follows:
Be higher than on one in limited time when detecting mains frequency, turn down described main steam and regulate steam valve, reduce to enter the steam flow of steam turbine, reduce exerting oneself of described generator, electric power grid frequency stabilization; And
Be lower than and prescribe a time limit when detecting mains frequency, turn down the frequency modulation modulating valve on the described extraction line, increase the steam flow of work done in the steam turbine, improve exerting oneself of described generator, electric power grid frequency stabilization.
The utility model adopts above technological scheme, draw gas at one or more steam turbine and to the extraction line of heater, to set up the frequency modulation modulating valve, when mains frequency is crossed when low, the control system of unit turns down the frequency modulation modulating valve on the extraction line immediately, increase the steam flow of work done in the steam turbine, thereby reached the purpose that increases the generator output electric power grid frequency stabilization.Because the task of unit primary frequency modulation is born by the frequency modulation modulating valve, main vapour is regulated steam valve then can be in 100% aperture always, has significantly reduced the restriction loss of main steam adjusting steam valve, can improve unit efficiency.In addition, adopt filling valve mode to compare with conventional art, the moving disturbance meeting of main steam flow reduces greatly in the utility model countercylinder, can reduce the vibration of steam turbine greatly, guarantees the safe operation of unit.
Description of drawings
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, wherein:
Fig. 1 illustrates a kind of existing Turbo-generator Set schematic representation that adopts throttling to regulate.
Fig. 2 illustrates a kind of existing Turbo-generator Set schematic representation that adopts the filling valve regulation.
The draw gas Turbo-generator Set schematic representation of frequency modulation modulating valve of the employing that Fig. 3 illustrates the utility model one embodiment.
Fig. 4 illustrates the application example of the utility model in eight grades of backheat turbine systems of multi-cylinder.
Embodiment
The draw gas Turbo-generator Set schematic representation of frequency modulation modulating valve of the employing that Fig. 3 illustrates the utility model one embodiment.In the present embodiment, Turbo-generator Set can comprise the heater that steam turbine 31, generator 32 and figure do not show.Know as is known to the person skilled in the art, steam turbine 31 is to produce power by the steam work done, and steam turbine 31 can drive generator 32 generatings thus, and delivers power to electrical network.31 are provided with main steam lead road 34 on the steam turbine.Steam turbine 31 can be single casing steam turbine or multi-cylinder turbine.Main steam lead road 34 also may be one the tunnel also may be multichannel.Main steam shut-off valve 34b and main steam can be set on main steam lead road 34 regulate steam valve 34a.One the tunnel or multichannel extraction line 35 (Fig. 3 illustrates 3 tunnel) connect the heater that steam turbine and figure do not show, so that steam is extracted out from steam turbine 31.The characteristics of present embodiment are, one the tunnel or multichannel extraction line 35 on the frequency modulation modulating valve is set.For example Fig. 3 is illustrated in 3 road extraction lines 35 frequency modulation modulating valve C1-C3 all is set.These frequency modulation modulating valve C1-C3 regulates the steam flow of work done in the steam turbine by the control extraction flow, thus regulator generator exert oneself electric power grid frequency stabilization.
It is worthy of note that valves such as the original check valve on each road extraction line, separating valve still need keep.
After setting up above-mentioned frequency modulation modulating valve C1-C3, the utility model one embodiment's primary frequency modulation process prescription is as follows:
When unit normally moved, main steam shut-off valve 34b, main steam regulate steam valve 34a and frequency modulation modulating valve C1-C3 is standard-sized sheet, reduces restriction loss to greatest extent.
Be higher than going up in limited time of allowing when detecting mains frequency, the control system of generator set suitably turns down main steam immediately and regulates steam valve 34a, reduce to enter the steam flow of steam turbine 31, reduce unit output and reduce exerting oneself of generator, thus electric power grid frequency stabilization.
When detect mains frequency be lower than allow following in limited time, the control system of generator set turns down the frequency modulation modulating valve on (comprise fully and closing) extraction line immediately, increase the steam flow of work done in the steam turbine, thereby increase generator output, reach the purpose of electric power grid frequency stabilization.
Because the frequency modulation modulating valve can be provided with on one road extraction line, also can on the multichannel extraction line, be provided with, when frequency modulation is regulated, can take all factors into consideration selection according to the requirement of the speed of response of extraction flow situations at different levels and primary frequency modulation.In embodiment of the present utility model, can turn down the frequency modulation modulating valve on (comprise fully and closing) some or all of extraction line.
With the application examples of a reality the utility model is described again below.Fig. 4 is the application example of the utility model in eight grades of backheat turbine systems of multi-cylinder (steam turbine shown in the accompanying drawing from left to right is divided into high, medium and low cylinder pressure).In order to satisfy the primary frequency modulation requirement of this unit, this example 1 has been set up frequency modulation modulating valve D1 drawing gas to the pipeline of heater 1,2 to the pipeline of heater 2, set up frequency modulation modulating valve D2 drawing gas, 3 to the pipeline of heater 3, set up frequency modulation modulating valve D3 drawing gas.
For a typical 600MW or 1000MW unit, as being drawn gas, one-level closes, can unit output be improved about 5% in the short period of time, close as secondary is drawn gas, can in the short period of time unit output be improved approximately 11%, close as three grades are drawn gas, can unit output be improved about 3% in the short period of time, draw gas as closing multichannel simultaneously, it will be bigger then unit output being brought up to amplitude, can satisfy the requirement of electrical network to unit primary frequency modulation quality fully.The technician can select one or more extraction steam pipe wherein to set up the frequency modulation modulating valve to the needs of unit primary frequency modulation according to electrical network.For example only on 1 pipeline that draws gas, set up frequency modulation modulating valve D1, for example be chosen in again and draw gas 1 and draw gas and set up frequency modulation modulating valve D1 and D2 on 2 pipelines.
In sum, embodiment of the present utility model sets up the frequency modulation modulating valve by drawing gas at one or more steam turbine to the extraction line of heater, when mains frequency is crossed when low, the control system of unit turns down the frequency modulation modulating valve on the extraction line immediately, increase the steam flow of work done in the steam turbine, thereby reached the purpose that increases the unit output electric power grid frequency stabilization.Because the task of unit primary frequency modulation is born by the frequency modulation modulating valve, main steam is regulated steam valve then can be in 100% aperture always, has significantly reduced the restriction loss of main steam adjusting steam valve, can improve unit efficiency.
Regulate the full admission Turbo-generator Set that satisfies the primary frequency modulation function for the employing throttling that has put into operation at present, can use the utility model changes into easily with the frequency modulation modulating valve that draws gas and satisfies primary frequency modulation, main steam is regulated the steam valve standard-sized sheet, improve the whole efficiency of unit.
Embodiment of the present utility model adopts the frequency modulation modulating valve that draws gas to increase the steam flow that enters the cylinder work done, this mode adopts filling valve mode to compare with conventional art, the moving disturbance meeting of main steam flow reduces greatly in the countercylinder, can reduce the vibration of steam turbine greatly, guarantees the safe operation of unit.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (7)
1. full admission Turbo-generator Set, comprise steam turbine, generator and heater, described steam turbine is in order to drive generator, described steam turbine is provided with main steam lead road and at least one road extraction line, described heater connects described steam turbine by described extraction line, it is characterized in that
On described extraction line, be provided with the frequency modulation modulating valve of exerting oneself with regulator generator by the steam flow of work done in the cylinder of regulating steam turbine to small part.
2. full admission Turbo-generator Set as claimed in claim 1 is characterized in that, described main steam lead road is provided with main steam and regulates steam valve.
3. the full admission Turbo-generator Set of stating as claim 2 is characterized in that, described main steam lead also is provided with the main steam Shuttoff Valve on the road.
4. full admission Turbo-generator Set as claimed in claim 1 is characterized in that, described main steam lead Lu Weiyi road.
5. full admission Turbo-generator Set as claimed in claim 1 is characterized in that, described main steam lead road is a multichannel.
6. full admission Turbo-generator Set as claimed in claim 1 is characterized in that, described steam turbine is a single casing steam turbine.
7. full admission Turbo-generator Set as claimed in claim 1 is characterized in that, described steam turbine is a multi-cylinder turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202266825U CN201696101U (en) | 2010-06-12 | 2010-06-12 | Full admission steam turbine generator unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202266825U CN201696101U (en) | 2010-06-12 | 2010-06-12 | Full admission steam turbine generator unit |
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| Publication Number | Publication Date |
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| CN201696101U true CN201696101U (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202266825U Expired - Lifetime CN201696101U (en) | 2010-06-12 | 2010-06-12 | Full admission steam turbine generator unit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278148A (en) * | 2010-06-12 | 2011-12-14 | 中国电力工程顾问集团华东电力设计院 | Full-period steam inlet steam turbine generator unit and primary frequency adjusting method thereof |
| CN102410051A (en) * | 2011-05-11 | 2012-04-11 | 东方电气集团东方汽轮机有限公司 | Adjustment method for steam extraction and heat supply of large steam turbine |
| CN102787870A (en) * | 2012-08-25 | 2012-11-21 | 华北电力大学（保定） | Method for improving primary frequency modulation capacity of heat supply unit |
-
2010
- 2010-06-12 CN CN2010202266825U patent/CN201696101U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102278148A (en) * | 2010-06-12 | 2011-12-14 | 中国电力工程顾问集团华东电力设计院 | Full-period steam inlet steam turbine generator unit and primary frequency adjusting method thereof |
| CN102410051A (en) * | 2011-05-11 | 2012-04-11 | 东方电气集团东方汽轮机有限公司 | Adjustment method for steam extraction and heat supply of large steam turbine |
| CN102410051B (en) * | 2011-05-11 | 2014-07-16 | 东方电气集团东方汽轮机有限公司 | Adjustment method for steam extraction and heat supply of large steam turbine |
| CN102787870A (en) * | 2012-08-25 | 2012-11-21 | 华北电力大学（保定） | Method for improving primary frequency modulation capacity of heat supply unit |
| CN102787870B (en) * | 2012-08-25 | 2014-11-26 | 华北电力大学（保定） | Method for improving primary frequency modulation capacity of heat supply unit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20110105 |