CN204002949U - Full admission generator set - Google Patents

Full admission generator set Download PDF

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Publication number
CN204002949U
CN204002949U CN201420513316.6U CN201420513316U CN204002949U CN 204002949 U CN204002949 U CN 204002949U CN 201420513316 U CN201420513316 U CN 201420513316U CN 204002949 U CN204002949 U CN 204002949U
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China
Prior art keywords
pressure heater
feed water
steam
boiler
frequency modulation
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Expired - Fee Related
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CN201420513316.6U
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Chinese (zh)
Inventor
黄家运
申松林
施刚夜
林磊
姚君
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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China Power Engineering Consulting Group East China Electric Power Design Institute Co Ltd
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Abstract

The utility model discloses a kind of full admission generator set, full admission generator set comprises: oxygen-eliminating device; Be connected n high-pressure heater with oxygen-eliminating device by feed water pump, n is more than or equal to 3, on each high-pressure heater, is connected with extraction line; The boiler being connected with n high-pressure heater by feedwater piping; Steam turbine; Generator; One end and being connected to water out supervisor of that high-pressure heater of close oxygen-eliminating device in n high-pressure heater, the other end with in n high-pressure heater the high-pressure heater of close boiler be responsible for the feed water by-pass frequency modulation modulating valve being connected to water out; And be connected to main steam shut-off valve and the main steam servo valve between steam turbine and boiler.

Description

Full admission generator set
Technical field
The utility model relates to a kind of full admission generator set, especially relates to a kind of full admission generator set that uses feed water by-pass frequency modulation technology.
Background technique
For improving the level of control of the quality of power supply and mains frequency, eliminate because network load changes the frequency fluctuation causing rapidly, ensure the safety and economic operation of electrical network, electrical network generally all requires the Turbo-generator Set networking to possess the ability of primary frequency modulation, and requiring Turbo-generator Set to possess increases or reduce a certain amount of ability of exerting oneself and declining or rising with quick responsive electricity grid frequency in the short period of time.Primary frequency modulation is the static frequency modulation characteristic of electrical network, and its implication is by the static characteristic of each set speed adjustment system in electrical network, utilizes the accumulation of energy of unit to bear network load variation, finally makes mains frequency form a steady frequency deviation.
In the prior art, two types of the full admission generator set that generally can be divided into throttling adjusting of full admission generator set and the full admission generator set of filling valve regulation, but all there is obvious shortcoming as the requirement that need meet primary frequency modulation in the steam turbine set that adopts these two kinds of admission control types, the mode of the primary frequency modulation of these two types of Turbo-generator Set is as follows.
(1) throttling regulative mode: adopt the full admission generator set of throttling adjusting as shown in Figure 1.Main steam shut-off valve standard-sized sheet, the single-conversion of unit is all that the aperture by changing steam turbine main steam servo valve realizes, main steam servo valve need be retained to 5%~15% aperture (being that valve only opens 95%~85%) in order to retain the ability of primary frequency modulation, the steam of full flow forms restriction loss during by main steam servo valve, thereby the efficiency of whole Turbo-generator Set will be reduced, and this loss will all exist within the unit whole service cycle.In the time that mains frequency is too high, the control system of unit suitably turns down main steam servo valve immediately, reduces to enter the steam flow of steam turbine, reduces unit output electric power grid frequency stabilization.In the time that mains frequency is too low, the control system of unit is suitably opened large main steam servo valve immediately, increases the steam flow that enters steam turbine, increases unit output electric power grid frequency stabilization.
(2) filling valve regulation mode: adopt the full admission generator set of filling valve regulation as shown in Figure 2.Main steam shut-off valve and main steam servo valve standard-sized sheet, when unit normally moves, filling valve is in closed condition, in the time that mains frequency is too high, the control system of unit suitably turns down main steam servo valve immediately, reduces to enter the steam flow of steam turbine, reduces unit output electric power grid frequency stabilization.In the time that mains frequency is too low, the control system of unit is suitably opened filling valve immediately, after making part initial steam by the throttling of filling valve, directly enter steam turbine intergrade, to increase flow area and steam flow, thereby reach the object that increases unit output electric power grid frequency stabilization.In the time that primary frequency modulation need to increase steam turbine and exerts oneself, open filling valve and will after the throttling of part initial steam, directly introduce steam turbine intergrade, to increase steam flow, but there is so larger restriction loss, greatly increase the hear rate of unit, reduce unit whole efficiency, in the steam steam flow countercylinder simultaneously filling into, steam flow produces larger disturbance, can increase to a certain extent the vibration of steam turbine, thisly vibrate senior general and jeopardize unit safety operation.
Model utility content
The utility model adopts and set up bypass on the feedwater piping of original thermodynamic system, enter the feedwater flow of high-pressure heater by adjusting, thereby change the extraction flow that enters high-pressure heater, and then the flow of work done steam in change steam turbine, thereby change exerting oneself of unit, reach the object of primary frequency modulation.After the primary frequency function of unit is realized by feed water by-pass frequency modulation modulating valve, just main steam servo valve can be kept to 100% aperture always, reduce the restriction loss of main steam servo valve, improve the efficiency of whole Turbo-generator Set, and can produce disturbance to steam turbine inside steam flow hardly, increase the Security of unit operation.
First aspect of the present utility model provides a kind of full admission generator set, comprising: oxygen-eliminating device; Be connected n high-pressure heater with oxygen-eliminating device by feed water pump, n is more than or equal to 3, on each high-pressure heater, is connected with extraction line; The boiler being connected with n high-pressure heater by feedwater piping; Steam turbine; Generator; One end and being connected to water out supervisor of that high-pressure heater of close oxygen-eliminating device in n high-pressure heater, the other end with in n high-pressure heater the high-pressure heater of close boiler be responsible for the feed water by-pass frequency modulation modulating valve being connected to water out; And be connected to main steam shut-off valve and the main steam servo valve between steam turbine and boiler.
In another preference, one end of described feed water by-pass frequency modulation modulating valve not with being connected to water out supervisor of that high-pressure heater of close oxygen-eliminating device in n high-pressure heater, but with being also responsible for and being connected to water out of the high-pressure heater of close boiler not of the most close oxygen-eliminating device neither in n high-pressure heater.
In another preference, also comprise external steam cooler, one end of this external steam cooler and being connected and the other end is connected with described feed water by-pass frequency modulation modulating valve and described boiler to water out supervisor of the high-pressure heater of close boiler in n high-pressure heater.
In another preference, also comprise external steam cooler, one end of this external steam cooler with in n high-pressure heater the high-pressure heater of close boiler to water out supervisor and described feed water by-pass frequency modulation modulating valve is connected and the other end is connected with described boiler.
In another preference, n high-pressure heater is arranged as single-row or multiple row.
In the utility model, by being to set up feed water by-pass frequency modulation modulating valve on delivery (pipe) line, can meet fast the requirement of primary frequency regulation of power network, and main vapour servo valve is opened completely.Meanwhile, by setting up feed water by-pass, can increase to a certain extent unit overburdening generating capacity.
In the feed water by-pass frequency modulation technology of full admission generator set of the present utility model, high-pressure heater can be single-row, also can be multiple row, high-pressure heater can be also multistage, and feed water by-pass extraction location can consider selection according to the requirement of extraction flows at different levels, feedwater flow and primary frequency regulation of power network.
Brief description of the drawings
Fig. 1 is the structural drawing that the full admission generator set of available technology adopting throttling adjusting is shown.
Fig. 2 is the structural drawing that the full admission generator set of available technology adopting filling valve regulation is shown.
Fig. 3 is the structural drawing that full admission generator set in the utility model embodiment 1 is shown.
Fig. 4 is the structural drawing that full admission generator set in the utility model embodiment 2 is shown.
Fig. 5 is the structural drawing that full admission generator set in the utility model embodiment 3 is shown.
Fig. 6 is the structural drawing that full admission generator set in the utility model embodiment 4 is shown.
Embodiment
Referring to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, in conjunction with specific embodiments, further set forth the utility model.Should be understood that following examples are only not used in restriction scope of the present utility model for the utility model is described.
Embodiment 1
The application example of the utility model in the current typically heat regenerative system with 3 grades of high-pressure heaters has been shown in Fig. 3.Obviously, the quantity of high-pressure heater is not limited to 3 in figure, can be also more than 3.As shown in Figure 3, full admission generator set comprises: oxygen-eliminating device, the boiler, steam turbine, generator, feed water by-pass frequency modulation modulating valve, main steam shut-off valve, the main steam servo valve that are connected 3 high-pressure heaters by feed water pump with oxygen-eliminating device, are connected with 3 high-pressure heaters by feedwater piping.On each high-pressure heater, be connected with extraction line.In order to meet the primary frequency modulation requirement of this unit, feed water by-pass is done to following configuration: draw a road feedwater being responsible for to water out of No. 3 high-pressure heaters, by accessing after feed water by-pass frequency modulation modulating valve on the main feed water pipe road of outlet of No. 1 high-pressure heater, after mixing with main feedwater, send into boiler, wherein, in feedwater MEDIA FLOW upwards, the most close boiler is No. 1 high-pressure heater.In the time that unit normally moves, main steam shut-off valve and main steam servo valve are standard-sized sheet, reduce to greatest extent restriction loss; Feed water by-pass frequency modulation modulating valve complete shut-down, all feedwater flow flows through No. 1 and No. 2 high-pressure heaters by main feedwater main road.In the time that mains frequency is too high, the control system of unit suitably turns down main steam servo valve immediately, reduces to enter the steam flow of steam turbine, reduces unit output electric power grid frequency stabilization.In the time that mains frequency is too low, the control system of unit is opened feed water by-pass frequency modulation modulating valve immediately, the part feedwater of No. 3 high-pressure heater outlets will flow to boiler by feed water by-pass frequency modulation modulating valve, the feedwater flow that enters No. 1 and No. 2 high-pressure heater will reduce to some extent, thereby reduce the extraction flow of No. 1 and No. 2 high-pressure heater, increase the steam flow of work done in steam turbine, thereby reached the object that increases unit output electric power grid frequency stabilization.
Embodiment 2
Fig. 4 shows the example of another full admission generator set.Obviously, the quantity of high-pressure heater is not limited to 4 in figure, can be also more than 4, can be also 3.As shown in Figure 4, feed water by-pass is done to following configuration: in order to meet the primary frequency modulation requirement of this unit, a road feedwater is drawn in main feed water pipe road between certain two-stage high-pressure heater, on the main feedwater outlet conduit of high-pressure heater of close boiler side, after mixing with main feedwater, send into boiler by feed water by-pass frequency modulation modulating valve access.In the time that unit normally moves, main steam shut-off valve and main steam servo valve are standard-sized sheet, reduce to greatest extent restriction loss; Feed water by-pass frequency modulation modulating valve complete shut-down, all feedwater flow flows through all high-pressure heaters by main feedwater main road.In the time that mains frequency is too high, the control system of unit suitably turns down main steam servo valve immediately, reduces to enter the steam flow of steam turbine, reduces unit output electric power grid frequency stabilization.In the time that mains frequency is too low, the control system of unit is opened feed water by-pass frequency modulation modulating valve immediately, part feedwater will flow to boiler by feed water by-pass modulating valve, the feedwater flow that enters the high-pressure heater in parallel with feed water by-pass frequency modulation modulating valve will reduce to some extent, thereby the extraction flow of this part high-pressure heater also can reduce, increase the steam flow of work done in steam turbine, thereby reached the object that increases unit output electric power grid frequency stabilization.
Embodiment 3
Fig. 5 shows the example of another full admission generator set.Obviously, the quantity of high-pressure heater is not limited to 3 in figure, can be also more than 3.As shown in Figure 5, compare with the embodiment shown in Fig. 3, the full admission generator set in Fig. 5 also comprises external steam cooler.In Fig. 5, feed water by-pass is done to following configuration: in order to meet the primary frequency modulation requirement of this unit, a road feedwater is drawn in main feed water pipe road between certain two-stage high-pressure heater, on the main feedwater outlet conduit of external steam cooler of close boiler side, after mixing with main feedwater, send into boiler by feed water by-pass frequency modulation modulating valve access.In the time that unit normally moves, main steam shut-off valve and main steam servo valve are standard-sized sheet, reduce to greatest extent restriction loss; Feed water by-pass frequency modulation modulating valve complete shut-down, all feedwater flow flows through all high-pressure heaters and external steam cooler by main feedwater main road.In the time that mains frequency is too high, the control system of unit suitably turns down main steam servo valve immediately, reduces to enter the steam flow of steam turbine, reduces unit output electric power grid frequency stabilization.In the time that mains frequency is too low, the control system of unit is opened feed water by-pass frequency modulation modulating valve immediately, part feedwater will flow to boiler by feed water by-pass modulating valve, the feedwater flow that enters the high-pressure heater in parallel with feed water by-pass frequency modulation modulating valve and external steam cooler will reduce to some extent, thereby the extraction flow of this part high-pressure heater and external steam cooler also can reduce, increase the steam flow of work done in steam turbine, thereby reached the object that increases unit output electric power grid frequency stabilization.
Embodiment 4
Fig. 6 shows the example of another full admission generator set, structure and structure similar illustrated in fig. 5.Obviously, the quantity of high-pressure heater is not limited to 3 in figure, can be also more than 3.As shown in Figure 6, compare with the embodiment shown in Fig. 4, the full admission generator set in Fig. 6 also comprises external steam cooler.Feed water by-pass is done to following configuration: in order to meet the primary frequency modulation requirement of this unit, a road feedwater is drawn in main feed water pipe road between certain two-stage high-pressure heater, on the main feed-water intake pipeline of external steam cooler of close boiler side, after mixing with main feedwater, send into boiler through external steam cooler by feed water by-pass frequency modulation modulating valve access.In the time that unit normally moves, main steam shut-off valve and main steam servo valve are standard-sized sheet, reduce to greatest extent restriction loss; Feed water by-pass frequency modulation modulating valve complete shut-down, all feedwater flow flows through all high-pressure heaters and external steam cooler by main feedwater main road.In the time that mains frequency is too high, the control system of unit suitably turns down main steam servo valve immediately, reduces to enter the steam flow of steam turbine, reduces unit output electric power grid frequency stabilization.In the time that mains frequency is too low, the control system of unit is opened feed water by-pass frequency modulation modulating valve immediately, part feedwater will flow to boiler by feed water by-pass modulating valve, entering the high-pressure heater feedwater flow in parallel with feed water by-pass frequency modulation modulating valve will reduce to some extent, thereby the extraction flow of this part high-pressure heater also can reduce, increase the steam flow of work done in steam turbine, thereby reached the object that increases unit output electric power grid frequency stabilization.
Sum up
Structure shown in Fig. 3 and Fig. 4 is applicable to not be with the full admission generator set of external steam cooler, and the structure shown in Fig. 5 and Fig. 6 is applicable to the full admission generator set with external steam cooler.
The difference of the structure shown in the structure shown in Fig. 4 and Fig. 3 is, structure shown in Fig. 4 is applicable to the full admission generator set of various parameters, capacity and backheat progression, and the extraction location of feed water by-pass can consider selection according to the requirement of extraction flows at different levels, feedwater flow and primary frequency regulation of power network.
High-pressure heater in Fig. 4 can be single-row, can be also multiple row, not limited by Fig. 4.
The difference of the structure shown in the structure shown in Fig. 5 and Fig. 6 is, in Fig. 5, external steam cooler is arranged within the scope of feed water by-pass frequency modulation modulating valve parallel pipeline, and in Fig. 6, external steam cooler is arranged on outside feed water by-pass frequency modulation modulating valve parallel pipeline scope, the extraction location of feed water by-pass and on-position can consider selection according to the requirement of extraction flows at different levels, feedwater flow and primary frequency regulation of power network.
High-pressure heater in Fig. 5 and Fig. 6 can be single-row, can be also multiple row, not limited by accompanying drawing.
In the utility model, by set up feed water by-pass frequency modulation modulating valve on the delivery (pipe) line of former thermodynamic system, in the time that mains frequency is too low, the control system of unit is opened feed water by-pass frequency modulation modulating valve immediately, reduce the confluent of the high-pressure heater of flowing through and then reduce the high-pressure heater amount of drawing gas, thereby the steam flow of work done in increase steam turbine, reaches the object that increases unit output electric power grid frequency stabilization.Because the task of unit primary frequency modulation is born by feed water by-pass frequency modulation modulating valve, main vapour servo valve can, always in 100% aperture, greatly reduce the restriction loss of main steam servo valve, can improve unit efficiency.
In the feed water by-pass frequency modulation technology of full admission generator set of the present utility model, high-pressure heater can be single-row, also can be multiple row, high-pressure heater might not be also 3 grades or 4 grades, and can be more multistage, feed water by-pass extraction location can consider selection according to the requirement of extraction flows at different levels, feedwater flow and primary frequency regulation of power network.All according to design of the present utility model on the basis of existing technology by the available technological scheme of logical analysis, reasoning, or a limited experiment, all should be in claim protection domain of the present utility model.
Effect
The throttling adjusting that prior art adopts and the mode of frequency regulation of filling valve regulation, unit all exists restriction loss, the particularly mode of frequency regulation of filling valve regulation also to have certain impact for the safe operation of unit in the time of normal operation or when overburdening is generated electricity.And the utility model is based on thermodynamic cycle basic principle, the mode of frequency regulation of feed water by-pass is set by employing, have the following advantages:
(1) set up feed water by-pass frequency modulation modulating valve by employing, thereby reduce high-pressure heater feedwater flow and reduce the high-pressure heater amount of drawing gas, can increase at short notice the steam flow of steam turbine work done, thereby increase fast unit output, reach the requirement of primary frequency modulation.
(2) the feed water by-pass frequency modulation modulating valve that the utility model is set up, invests littlely, but what exchange for is that main steam servo valve needn't be in the aperture of long-term reservation 5%~15% normal in service, thereby can improve the whole efficiency of thermodynamic system.Regulate the full admission generator set that meets primary frequency function for the employing throttling having put into operation at present, adopting the utility model also can change into very easily sets up feed water by-pass frequency modulation modulating valve and meets primary frequency modulation, by main steam servo valve standard-sized sheet, improve the whole efficiency of unit.
(3) the utility model can be according to the requirement of feedwater flow, extraction flow and electrical network, select feed water by-pass and the frequency modulation modulating valve of suitable capacity, on the basis that meets primary frequency modulation, what increase unit completely sends out allowance, has certain economic benefit for power plant's operation.
(4) the utility model adopts feed water by-pass frequency modulation modulating valve to reduce the confluent through high-pressure heater, thereby increase the steam flow that enters cylinder work done, this method is compared with adopting filling valve mode of frequency regulation, in countercylinder, main vapour flow disturbance can reduce greatly, can greatly reduce the vibration of steam turbine, ensure the safe operation of unit.
In addition should be understood that those skilled in the art can make various changes or modifications the utility model after having read above-mentioned instruction content of the present utility model, these equivalent form of values fall within the application's appended claims limited range equally.

Claims (5)

1. a full admission generator set, is characterized in that, comprising:
Oxygen-eliminating device;
Be connected n high-pressure heater with oxygen-eliminating device by feed water pump, n is more than or equal to 3, on each high-pressure heater, is connected with extraction line;
The boiler being connected with n high-pressure heater by feedwater piping;
Steam turbine;
Generator;
One end and being connected to water out supervisor of that high-pressure heater of close oxygen-eliminating device in n high-pressure heater, the other end with in n high-pressure heater the high-pressure heater of close boiler be responsible for the feed water by-pass frequency modulation modulating valve being connected to water out; And
Be connected to main steam shut-off valve and main steam servo valve between steam turbine and boiler.
2. full admission generator set as claimed in claim 1, is characterized in that,
One end of described feed water by-pass frequency modulation modulating valve not with being connected to water out supervisor of that high-pressure heater of close oxygen-eliminating device in n high-pressure heater, but with being also responsible for and being connected to water out of the high-pressure heater of close boiler not of the most close oxygen-eliminating device neither in n high-pressure heater.
3. full admission generator set as claimed in claim 1, is characterized in that,
Also comprise external steam cooler, one end of this external steam cooler and being connected and the other end is connected with described feed water by-pass frequency modulation modulating valve and described boiler to water out supervisor of the high-pressure heater of close boiler in n high-pressure heater.
4. full admission generator set as claimed in claim 2, is characterized in that,
Also comprise external steam cooler, one end of this external steam cooler with in n high-pressure heater the high-pressure heater of close boiler to water out supervisor and described feed water by-pass frequency modulation modulating valve is connected and the other end is connected with described boiler.
5. the full admission generator set as described in any one in claim 2-4, is characterized in that,
N high-pressure heater is arranged as single-row or multiple row.
CN201420513316.6U 2014-09-05 2014-09-05 Full admission generator set Expired - Fee Related CN204002949U (en)

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Application Number Priority Date Filing Date Title
CN201420513316.6U CN204002949U (en) 2014-09-05 2014-09-05 Full admission generator set

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104213946A (en) * 2014-09-05 2014-12-17 中国电力工程顾问集团华东电力设计院 Full-arc admission generator set and water supply bypass regulation method thereof
CN107145175A (en) * 2017-05-26 2017-09-08 中国核动力研究设计院 A kind of steam generator feed temperature controls simulation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104213946A (en) * 2014-09-05 2014-12-17 中国电力工程顾问集团华东电力设计院 Full-arc admission generator set and water supply bypass regulation method thereof
CN107145175A (en) * 2017-05-26 2017-09-08 中国核动力研究设计院 A kind of steam generator feed temperature controls simulation system

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Address after: 200063 Wuning Road, Shanghai, No. 409, No.

Patentee after: EAST CHINA ELECTRIC POWER DESIGN INSTITUTE CO., LTD. OF CHINA POWER ENGINEERING CONSULTING Group

Address before: 200063 Wuning Road, Shanghai, No. 409, No.

Patentee before: CHINA POWER ENGINEERING CONSULTING Group CORPORATION EAST CHINA ELECTRIC POWER DESIGN INSTITUTE

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141210