CN106368749A - Primary frequency regulation load increase method of participation units through cutting low-pressure heaters from water side - Google Patents
Primary frequency regulation load increase method of participation units through cutting low-pressure heaters from water side Download PDFInfo
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- CN106368749A CN106368749A CN201610824253.XA CN201610824253A CN106368749A CN 106368749 A CN106368749 A CN 106368749A CN 201610824253 A CN201610824253 A CN 201610824253A CN 106368749 A CN106368749 A CN 106368749A
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- low
- pressure heater
- pressure
- water side
- primary frequency
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a primary frequency regulation load increase method of participation units through cutting low-pressure heaters from the water side. The method is characterized in that the economic operation manner of opening all high-pressure control valves is maintained, when the grid frequency decreases to a threshold value, the low-pressure heaters are cut from the water side through closing a water inlet valve of the low-pressure heaters, the stored energy of steam extraction of the low-pressure heaters is released, and the function of load increase through primary frequency regulation is achieved. Compared with the prior art, the method has the advantages that economic operation is achieved, the requirement on primary frequency regulation can be met, the method has important meaning for a plurality of throttle steam distribution units, and energy conservation and emission reduction of a thermal power unit are further facilitated.
Description
Technical field
The present invention relates to the automation field of thermal power generation unit, it is primarily adapted for use in the steam turbine that vapour is joined in all-round throttling
Group, especially relates to a kind of method that excision low-pressure heater water side participates in unit primary frequency modulation application of load.
Background technology
Because electric energy is difficult to Mass storage, electrical network needs the moment to keep the balance between electricity consumption and generating, mains frequency
It is the important indicator reflecting this situation.When power load is more than generation load, mains frequency will decline；Conversely, when generating
When load is more than power load, mains frequency will raise.Primary frequency modulation just refers to that unit directly accepts the deviation letter of mains frequency
Number, by changing the actual load of unit, reach the purpose of electric power grid frequency stabilization, that is, when mains frequency decrease beyond certain dead band
When, increase unit load so that mains frequency raises；When mains frequency is increased beyond certain dead band, reduces unit load, make
Obtain mains frequency to decline.The generating set being incorporated into the power networks typically requires possess primary frequency function, can be in certain amplitude model
In enclosing, according to certain diversity factor, the change according to mains frequency quickly adjusts unit load.
Have in domestic super (super-) critical Turbo-generator Set larger proportion be using full admission throttle distribution way of steam, by
Join vapour phase and join vapour than advanced technique in throttling and can improve operational efficiency under unit declared working condition, from now in Large Copacity thermal motor
In group, throttling is joined the unit ratio of vapour and also can be continuously increased.For this kind of unit, its most economical method of operation is high pressure
Pitch standard-sized sheet sliding pressure operation.But due to pitch standard-sized sheet, namely lose the means that pitch continues to open quickly increase unit load greatly,
How to meet dispatching of power netwoks is a very big problem to the performance requirement of unit primary frequency modulation.Especially in current extra-high voltage grid and
Under the background of large-scale direct current transmission of electricity, once due to transmission line malfunction, causing receiving end supply load to lack, mains frequency is fast
Speed declines, and needs local unit quickly to increase load to realize primary frequency function, therefore the economic fortune of steam turbine group is joined in these throttlings
There is larger contradiction between line mode and Primary frequency control ability.
Domestic much such unit, in order to meet the performance requirement of primary frequency modulation it has to turn down high-pressure governing valve, using tune
The mode that door throttling runs, sacrifices larger economy, especially at low load, the restriction loss of pitch is bigger.
Content of the invention
The purpose of the present invention is exactly to overcome the defect of above-mentioned prior art presence to provide a kind of excision low-pressure heating
The method that device water side participates in unit primary frequency modulation application of load.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of method that excision low-pressure heater water side participates in unit primary frequency modulation application of load, the method keeps high-pressure governing valve
The way of economic operation of standard-sized sheet, when mains frequency drops to given threshold pass through close low-pressure heater inlet valve, that is, from
Water side, to excise low-pressure heater, discharges the accumulation of energy that low-pressure heater draws gas, and realizes primary frequency modulation quick application of load function.
The method particularly as follows:
1) unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, low-pressure heater bringing normally into operation；
2) when mains frequency drops to given threshold, low-pressure heater water side water inlet pitch instruction is closed in triggering；
3) simultaneously close off low-pressure heater vapour side admission valve and non-return valve, open low-pressure heater water side bypass valve；
4) the corresponding boiler master that increases instructs, and increases boiler fired coal, feedwater and air quantity, increases boiler output；
5), after closing low-pressure heater water inlet pitch, low-pressure heater condensing water flow quickly reduces, thus spontaneously subtracting
Few low-pressure heater amount of drawing gas, increases low pressure (LP) cylinder acting quantity of steam, unit load quickly increases, and realizes primary frequency modulation application of load work(
Energy；
6) after mains frequency recovers, water inlet pitch recovers automatically to original state, participates in hot well and deaerator level is adjusted.
In order to ensure the minimum flow of condensate pump, triggering is opened while closing low-pressure heater water side water inlet pitch instruction
Open solidifying pump recirculation pitch.
Because low-pressure heater water inlet pitch has different opening, therefore pitch is determined according to the degree that mains frequency declines and opens
Degree.When mains frequency decrease beyond setting value, this pitch fully closed, low-pressure heater is excised completely；When mains frequency declines not
When exceeding setting value, turn down this pitch to setting position, realize the Partial Resection of low-pressure heater.
Sequence valve is joined to the Steam Turbine of vapour, using the method, when mains frequency drops to given threshold, triggering is cut
Except low-pressure heater water side function to participate in primary frequency modulation, can supplement as one kind of original primary frequency function.
Compared with prior art, the inventive method can keep the way of economic operation of high-pressure governing valve standard-sized sheet, in mains frequency
By closing low-pressure heater inlet valve when declining to a certain extent, to excise low-pressure heater from water side, to discharge low
The accumulation of energy that pressure heater draws gas, realizes primary frequency modulation quick application of load function.So both enabled economical operation, one can have been met again
Secondary frequency modulation requires, and this joins significant for steam turbine group to large number of throttling, is promoted the energy-conservation of fired power generating unit further
Reduce discharging.
Brief description
Fig. 1 is low-pressure heater backheat and condensate system schematic diagram.
Fig. 2 quickly closes the load responding curve of hour for low-pressure heater water inlet pitch.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to
Following embodiments.
Full admission throttling is joined to the Steam Turbine of vapour, the most economical method of operation is high-pressure governing valve standard-sized sheet sliding pressure fortune
OK, but lose the ability of the quick application of load of high-pressure governing valve.When mains frequency declines needs quick increase unit output, can only
Consider other modes.Low-pressure heater belongs to the heat regenerative system of steam turbine thermodynamic cycle, therefrom, low pressure (LP) cylinder extraction section steam come
Heat-setting water, reduces cold source energy, thus improving efficiency of thermal cycle.When needing primary frequency modulation application of load, it is possible to use
The accumulation of energy of drawing gas of low-pressure heater heat regenerative system, closes low-pressure heater water side pitch, adds thus spontaneously reducing and entering low pressure
The amount of drawing gas of hot device is so that original return to cylinder and continue acting such that it is able to increase machine faster to drawing gas of low-pressure heater
Group load.Certainly, excision low-pressure heater heat regenerative system also can affect unit cycle efficieny, but primary frequency modulation action needs to excise
The chance of low-pressure heater seldom, does not generally need to excise low-pressure heater, and high-pressure governing valve can maintain standard-sized sheet all the time
Sliding pressure operation is such that it is able to significantly improve unit operation economy.The schematic diagram of low-pressure heater backheat and condensate system is shown in
Fig. 1.
Crew qiting has three high-pressure heaters, an oxygen-eliminating device and 4 low-pressure heaters under normal circumstances, according to heating power
It is #5, #6, #7 and #8 that low-pressure heater is numbered by parameter from high to low respectively.Condensate is boosted by condensate pump from hot well,
Again after low-pressure heater water inlet pitch flows through 4 low-pressure heaters, after improving condensing water temperature, enter oxygen-eliminating device.Pass through
Adjust water inlet pitch to control condensing water flow, to maintain certain hot well and deaerator level.
The specific implementation step that primary frequency modulation application of load is realized in excision low-pressure heater water side is as follows:
Unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, low-pressure heater bringing normally into operation；
When mains frequency decrease beyond to a certain degree, low-pressure heater water side water inlet pitch instruction is closed in triggering；
In order to ensure the minimum flow of condensate pump, open solidifying pump recirculation pitch simultaneously；
Simultaneously close off low-pressure heater vapour side admission valve and non-return valve, open low-pressure heater water side bypass valve；
The corresponding boiler master that increases instructs, and increases boiler fired coal, feedwater and air quantity, increases boiler output；
After closing low-pressure heater water inlet pitch, low-pressure heater condensing water flow quickly reduces, thus spontaneously reducing
The low-pressure heater amount of drawing gas, increases low pressure (LP) cylinder acting quantity of steam, unit load quickly increases, and realizes primary frequency modulation application of load work(
Energy；
After mains frequency recovers, water inlet pitch recovers automatically to original state, participates in hot well and deaerator level is adjusted.
During practical application, because low-pressure heater water inlet pitch can have different opening, therefore can be according under mains frequency
The degree of fall rationally to determine pitch aperture.When mains frequency declines more, this pitch fully closed, low-pressure heater is cut completely
Remove, when mains frequency declines few, turn down this pitch to correct position, realize the Partial Resection of low-pressure heater.
In addition, join the Steam Turbine of vapour for sequence valve, a kind of as original Primary frequency control ability supplements it is also possible to adopt
Use this kind of method, when mains frequency declines to a certain extent, triggering excises low-pressure heater water side function to participate in once adjusting
Frequently.
Specific embodiment
For a certain 1000mw supercritical turbine group, adopt the economy side of high-pressure governing valve standard-sized sheet sliding pressure operation at ordinary times
Formula, can calculate the accumulation of energy of drawing gas of low-pressure heater, refer to table 1 below according to its heat balance diagram.
Table 1 1000mw Set Low Pressure Heater excision load increases theoretical amount
As can be known from Table 1, under unit rated load, the whole low-pressure heater in vapour side can increase unit output in theory
53.5mw, in 500mw load, can increase unit output 20.3mw.
Participate in specifically comprising the following steps that of primary frequency modulation application of load by excising low-pressure heater water side
When mains frequency decrease beyond to a certain degree, logic automatic decision goes out large frequency-difference signal, sends excision low pressure and adds
The instruction of hot device water side；
Low-pressure heater water side water inlet pitch, this pitch of quick closedown are delivered in this instruction；
Instruct simultaneously and also deliver to solidifying pump recirculation pitch, open recirculation pitch, to guarantee condensate pump minimum through-current capacity,
In order to avoid the tripping operation of condensate pump low discharge；
Simultaneously close off low-pressure heater vapour side admission valve, open low-pressure heater water side bypass valve；
Also there is instruction to deliver to boiler master simultaneously, accordingly increase boiler feedwater, coal-fired and air output, increase boiler output,
To make up storage of the generator set utilization；
After low-pressure heater condensing capacity reduces, the low-pressure heater amount of drawing gas can reduce automatically, and low pressure (LP) cylinder acting therewith is steamed
Vapour amount increases, and unit load increases, and realizes primary frequency modulation application of load function；
After low-pressure heater vapour side valve door is fully closed, then low-pressure heater draws gas and completely cuts through；
(generally require a few minutes clock time after mains frequency recovers normally), automatically turn on low-pressure heater water inlet pitch,
Recover this pitch and participate in water level regulation function, recover low-pressure heater normal operating mode.
During practical application, pitch aperture can also rationally be determined according to the degree that mains frequency declines, realize low pressure and add
Hot device complete resection or Partial Resection.
The test situation turning down low-pressure heater water inlet pitch participation primary frequency modulation refers to Fig. 2, in unit load 950mw
When, quickly low-pressure heater water inlet pitch aperture is turned down to 15% from 40%, condensing water flow from 1830t/h about rapid
Drop to 860t/h, load rose 16mw, test duration 5 minutes about in 30 seconds, and maximum load increased about 33mw.When
So, the variable quantity of unit load becomes positive correlation with the variable quantity of condensing water flow with current loads.If by low-pressure heating
Device water inlet pitch Close All, can increase by about 5% unit output under rated load, can effectively realize unit primary frequency modulation and add
Burden functional.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replace
Change, these modifications or replacement all should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
The protection domain requiring is defined.
Claims (6)
1. a kind of excision low-pressure heater water side participates in the method for unit primary frequency modulation application of load it is characterised in that the method is protected
Hold the way of economic operation of high-pressure governing valve standard-sized sheet, pass through when mains frequency drops to given threshold to close low-pressure heater water inlet
Valve, to excise low-pressure heater from water side, discharges the accumulation of energy that low-pressure heater draws gas, and realizes primary frequency modulation quick plus negative
Lotus function.
2. the method that a kind of excision low-pressure heater water side according to claim 1 participates in unit primary frequency modulation application of load,
It is characterized in that, the method particularly as follows:
1) unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, low-pressure heater bringing normally into operation；
2) when mains frequency drops to given threshold, low-pressure heater water side water inlet pitch instruction is closed in triggering；
3) simultaneously close off low-pressure heater vapour side admission valve and non-return valve, open low-pressure heater water side bypass valve；
4) the corresponding boiler master that increases instructs, and increases boiler fired coal, feedwater and air quantity, increases boiler output；
5), after closing low-pressure heater water inlet pitch, low-pressure heater condensing water flow quickly reduces, thus spontaneously reducing low
The pressure heater amount of drawing gas, increases low pressure (LP) cylinder acting quantity of steam, unit load quickly increases, and realizes primary frequency modulation application of load function；
6) after mains frequency recovers, water inlet pitch recovers automatically to original state, participates in hot well and deaerator level is adjusted.
3. the method that a kind of excision low-pressure heater water side according to claim 2 participates in unit primary frequency modulation application of load,
It is characterized in that, in order to ensure the minimum flow of condensate pump, the same of low-pressure heater water side water inlet pitch instruction is closed in triggering
Shi Kaiqi coagulates pump recirculation pitch.
4. the method that a kind of excision low-pressure heater water side according to claim 2 participates in unit primary frequency modulation application of load,
It is characterized in that, because low-pressure heater water inlet pitch has different opening, therefore tune is determined according to the degree that mains frequency declines
Door aperture.
5. the method that a kind of excision low-pressure heater water side according to claim 4 participates in unit primary frequency modulation application of load,
It is characterized in that, when mains frequency decrease beyond setting value, this pitch fully closed, low-pressure heater is excised completely；When electrical network frequency
When rate declines less than setting value, turn down this pitch to setting position, realize the Partial Resection of low-pressure heater.
6. the method that a kind of excision low-pressure heater water side according to claim 2 participates in unit primary frequency modulation application of load,
It is characterized in that, sequence valve is joined to the Steam Turbine of vapour, using changing method, when mains frequency drops to given threshold, touch
Send out excision low-pressure heater water side function to participate in primary frequency modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610824253.XA CN106368749B (en) | 2016-09-14 | 2016-09-14 | Method for cutting off water side of low-pressure heater to participate in primary frequency modulation loading of unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610824253.XA CN106368749B (en) | 2016-09-14 | 2016-09-14 | Method for cutting off water side of low-pressure heater to participate in primary frequency modulation loading of unit |
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| CN106368749B CN106368749B (en) | 2020-04-21 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107143844A (en) * | 2017-05-27 | 2017-09-08 | 杭州意能电力技术有限公司 | A kind of fired power generating unit control method and system based on condensate throttling |
| CN107143843A (en) * | 2017-05-17 | 2017-09-08 | 中国神华能源股份有限公司 | The method and apparatus that condensate adjusts load |
| CN108104888A (en) * | 2017-12-28 | 2018-06-01 | 赫普科技发展（北京）有限公司 | A kind of power grid frequency modulation system and method based on frequency modulation bypass |
| CN108413378A (en) * | 2018-04-19 | 2018-08-17 | 重庆大学 | It is a kind of to be used for steam turbine and low plus safe and stable operation system |
| CN108730954A (en) * | 2017-04-20 | 2018-11-02 | 中国电力工程顾问集团华东电力设计院有限公司 | The primary frequency modulation control system and its control method to be throttled using water supply |
| CN109857033A (en) * | 2019-02-28 | 2019-06-07 | 中国能源建设集团广东省电力设计研究院有限公司 | Condensate throttling switching control method, device and computer equipment |
| CN110645061A (en) * | 2019-10-31 | 2020-01-03 | 大唐郓城发电有限公司 | Double-machine regenerative system for cutting off low-pressure heater and primary frequency modulation method thereof |
| CN109343409B (en) * | 2018-10-30 | 2023-06-13 | 华能国际电力股份有限公司福州电厂 | Auxiliary control system and method for primary frequency modulation of full-cycle steam inlet unit |
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| US4819436A (en) * | 1988-05-26 | 1989-04-11 | General Electric Company | Deaerator pressure control system |
| EP2322768A1 (en) * | 2009-11-13 | 2011-05-18 | Siemens AG | Steam power assembly and method for operating same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108730954A (en) * | 2017-04-20 | 2018-11-02 | 中国电力工程顾问集团华东电力设计院有限公司 | The primary frequency modulation control system and its control method to be throttled using water supply |
| CN108730954B (en) * | 2017-04-20 | 2024-04-12 | 中国电力工程顾问集团华东电力设计院有限公司 | Primary frequency modulation control system adopting water supply throttling and control method thereof |
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| CN107143844A (en) * | 2017-05-27 | 2017-09-08 | 杭州意能电力技术有限公司 | A kind of fired power generating unit control method and system based on condensate throttling |
| CN108104888B (en) * | 2017-12-28 | 2023-09-05 | 赫普能源环境科技股份有限公司 | Power grid frequency modulation system and method based on frequency modulation bypass |
| CN108104888A (en) * | 2017-12-28 | 2018-06-01 | 赫普科技发展（北京）有限公司 | A kind of power grid frequency modulation system and method based on frequency modulation bypass |
| CN108413378A (en) * | 2018-04-19 | 2018-08-17 | 重庆大学 | It is a kind of to be used for steam turbine and low plus safe and stable operation system |
| CN108413378B (en) * | 2018-04-19 | 2023-08-25 | 重庆大学 | System for be used for steam turbine and low safe steady operation that adds |
| CN109343409B (en) * | 2018-10-30 | 2023-06-13 | 华能国际电力股份有限公司福州电厂 | Auxiliary control system and method for primary frequency modulation of full-cycle steam inlet unit |
| CN109857033B (en) * | 2019-02-28 | 2020-10-09 | 中国能源建设集团广东省电力设计研究院有限公司 | Condensate throttling switching control method and device and computer equipment |
| CN109857033A (en) * | 2019-02-28 | 2019-06-07 | 中国能源建设集团广东省电力设计研究院有限公司 | Condensate throttling switching control method, device and computer equipment |
| CN110645061A (en) * | 2019-10-31 | 2020-01-03 | 大唐郓城发电有限公司 | Double-machine regenerative system for cutting off low-pressure heater and primary frequency modulation method thereof |
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|---|---|
| CN106368749B (en) | 2020-04-21 |
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