CN106352321A - Method for removing high-pressure heater based on waterside bypass to participate in primary frequency modulation of unit - Google Patents
Method for removing high-pressure heater based on waterside bypass to participate in primary frequency modulation of unit Download PDFInfo
- Publication number
- CN106352321A CN106352321A CN201610824264.8A CN201610824264A CN106352321A CN 106352321 A CN106352321 A CN 106352321A CN 201610824264 A CN201610824264 A CN 201610824264A CN 106352321 A CN106352321 A CN 106352321A
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- China
- Prior art keywords
- pressure heater
- frequency modulation
- primary frequency
- pressure
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
-
- 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating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
Abstract
The invention relates to a method for removing a high-pressure heater based on a waterside bypass to participate in primary frequency modulation of a unit. According to the method, an economical operating mode of full opening of a high-pressure control valve is kept, the high-pressure heater is rapidly removed by the aid of the waterside bypass of the high-pressure heater when grid frequency is reduced to a set threshold value, so that stored energy of steam extraction of the high-pressure heater is released, a function of rapid loading through primary frequency modulation is realized. Compared with the prior art, the method can realize economical operation and meet the requirement for the primary frequency modulation, has great significance for a large number of throttling steam distribution units, and can further promote energy conservation and emission reduction of a thermal power generating unit.
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 bypassing excision high-pressure heater participation unit primary frequency modulation based on water side.
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 ability 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 water side that is based on to bypass
The method that excision high-pressure heater participates in unit primary frequency modulation.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of method bypassing excision high-pressure heater participation unit primary frequency modulation based on water side, the method keeps high pressure to adjust
The way of economic operation of door standard-sized sheet, utilizes when mains frequency drops to given threshold high-pressure heater water side to bypass, quickly cuts
Except high-pressure heater, thus discharging the accumulation of energy that high-pressure heater draws gas, realize primary frequency modulation quick application of load function.
Preferably, the method particularly as follows:
1) unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, high-pressure heater bringing normally into operation；
2) when mains frequency drops to given threshold, triggering high-pressure heater excision instruction, quickly open hyperbaric heating
Device water side bypasses, and closes feedwater import and export valve so that feedwater is bypassed to boiler；
3) also send instructions the corresponding high-pressure heater of closing simultaneously；
4) require the corresponding boiler master that increases to instruct according to the primary frequency modulation setting, increase boiler fired coal, feedwater and air quantity,
Increase boiler output；
5) after high-pressure heater water inlet cut-out, high-pressure heater draws gas and understands spontaneous minimizing, and the acting hence into cylinder is steamed
Vapour amount increases, and unit load quickly increases, and realizes primary frequency modulation application of load function；
6), after mains frequency recovers, come into operation high-pressure heater again, and unit recovers to original way of economic operation.
Preferably, described step 3) send instructions three high-pressure heaters of closing.
Preferably, described step 3) send instructions and close the vapour side of high-pressure heater and draw gas electrically operated gate and non-return flap.
Join the Steam Turbine of vapour preferably for sequence valve, using the method, drop to given threshold in mains frequency
When, the bypass of triggering high-pressure heater water side excises high-pressure heater to participate in primary frequency modulation, can be used as original primary frequency modulation work(
The a kind of of energy supplements.
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
Using the bypass of high-pressure heater water side when declining to a certain extent, quickly excise high-pressure heater, thus discharging hyperbaric heating
The accumulation of energy that device draws gas, realizes primary frequency modulation quick application of load function.So both enabled economical operation, primary frequency modulation can have been met again
Require, this joins significant for steam turbine group to large number of throttling, is promoted the energy-saving and emission-reduction of fired power generating unit further.
Brief description
Fig. 1 is high-pressure heater and water side bypass arrangement schematic diagram.
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.High-pressure heater belongs to the heat regenerative system of steam turbine thermodynamic cycle, comes from high, intermediate pressure cylinder extraction section steam
Heating feedwater, reduces cold source energy, thus improving efficiency of thermal cycle.When needing primary frequency modulation application of load, it is possible to use high
The accumulation of energy of drawing gas of pressure heater heat regenerative system, quickly opens high-pressure heater water side bypass valve so that feedwater is no longer flow through height
Pressure heater, but is bypassed to boiler by water side, is also switched off high-pressure heater vapour side valve door so that originally paramount simultaneously
Drawing gas of pressure heater returns to height, intermediate pressure cylinder continues acting such that it is able to increase unit load faster.Certainly, excise high pressure
Heater heat regenerative system also can affect unit cycle efficieny, but primary frequency modulation action needs the chance of excision high-pressure heater very
Few, generally do not need to excise high-pressure heater, and high-pressure governing valve can maintain standard-sized sheet sliding pressure operation all the time such that it is able to show
Write and improve unit operation economy.
Generally crew qiting have three high-pressure heaters, an oxygen-eliminating device and 4 low plus, according to thermal parameter from
High to Low number high-pressure heater respectively is #1, #2 and #3, and part Large-scale fire-electricity unit is disposed with biserial high-pressure heater.High
Fig. 1 is shown in by pressure heater arrangement schematic diagram.
The specific implementation step that primary frequency modulation application of load realized by excision high-pressure heater is bypassed by high-pressure heater water side
As follows:
Unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, high-pressure heater bringing normally into operation；
When mains frequency decrease beyond to a certain degree, triggering high-pressure heater excision instruction, quickly open hyperbaric heating
Device water side bypasses, and closes feedwater import and export valve so that feedwater is bypassed to boiler；
Also send instructions simultaneously and close the vapour side of three high-pressure heaters and draw gas electrically operated gate and non-return flap；
Require the corresponding boiler master that increases to instruct according to primary frequency modulation, increase boiler fired coal, feedwater and air quantity, increase boiler
Exert oneself；
After high-pressure heater water inlet cut-out, high-pressure heater draws gas and understands spontaneous minimizing, hence into the acting steam of cylinder
Amount increases, and unit load quickly increases, and realizes primary frequency modulation application of load function；
After mains frequency recovers, operations staff is come into operation three high-pressure heaters again, and unit recovers to original economy fortune
Line mode.
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 high-pressure heater water side bypass excision high-pressure heater
Participate in primary frequency modulation.
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 high-pressure heater, refer to table 1 below according to its heat balance diagram.
Table 1 1000mw unit high-pressure heater excision load increases theoretical amount
As can be known from Table 1, under unit rated load, complete resection high-pressure heater can increase unit output in theory
131.5mw.This 1000mw adopts high-pressure heater dually arrayed mode, can only excise a row high-pressure heater, then specified negative
Half can be increased under lotus in theory exert oneself, that is, increase 75.7mw.
The concrete steps bypassing excision a row high-pressure heater participation primary frequency modulation application of load by high-pressure heater water side are such as
Under:
Unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, high-pressure heater bringing normally into operation；
When mains frequency decrease beyond to a certain degree, logic automatic decision goes out large frequency-difference signal, sends excision a row high pressure
Heater instructs, and quickly opens the water side bypass of a row high-pressure heater；
This instruction also delivers to that electrically operated gate is drawn gas in #1 high-pressure heater a side and draws gas non-return flap in #1 high-pressure heater a side simultaneously；
This instruction also delivers to that electrically operated gate is drawn gas in #2 high-pressure heater a side and draws gas non-return flap in #2 high-pressure heater a side simultaneously；
This instruction also delivers to that electrically operated gate is drawn gas in #3 high-pressure heater a side and draws gas non-return flap in #3 high-pressure heater a side simultaneously；
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 the water inlet cut-out of a row high-pressure heater, the amount of drawing gas of three high-pressure heaters of a row can quickly reduce automatically, with
Entrance steam turbine acting quantity of steam increase, unit load increase, realize primary frequency modulation application of load function.When vapour side valve
After door is fully closed, high-pressure heater draws gas, and completely cuts through；
(generally require a few minutes clock time after mains frequency recovers normally), high by operations staff's a row three that gradually put into operation
Pressure heater, recovers unit normal operating mode.
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 (5)
1. a kind of excision high-pressure heater is bypassed based on water side participate in the method for unit primary frequency modulation it is characterised in that the method
Keep the way of economic operation of high-pressure governing valve standard-sized sheet, utilize by high-pressure heater water side when mains frequency drops to given threshold
Road, quickly excising high-pressure heater, thus discharging the accumulation of energy that high-pressure heater draws gas, realizing primary frequency modulation quick application of load work(
Energy.
2. a kind of side bypassing excision high-pressure heater participation unit primary frequency modulation based on water side according to claim 1
Method it is characterised in that the method particularly as follows:
1) unit runs according to high-pressure governing valve standard-sized sheet sliding pressure mode, high-pressure heater bringing normally into operation；
2) when mains frequency drops to given threshold, triggering high-pressure heater excision instruction, quick unlatching high-pressure heater water
Side bypasses, and closes feedwater import and export valve so that feedwater is bypassed to boiler；
3) also send instructions the corresponding high-pressure heater of closing simultaneously；
4) require the corresponding boiler master that increases to instruct according to the primary frequency modulation setting, increase boiler fired coal, feedwater and air quantity, increase
Boiler output；
5), after high-pressure heater water inlet cut-out, high-pressure heater draws gas and understands spontaneous minimizing, hence into the acting quantity of steam of cylinder
Increase, unit load quickly increases, realize primary frequency modulation application of load function；
6), after mains frequency recovers, come into operation high-pressure heater again, and unit recovers to original way of economic operation.
3. a kind of side bypassing excision high-pressure heater participation unit primary frequency modulation based on water side according to claim 2
Method is it is characterised in that described step 3) send instructions three high-pressure heaters of closing.
4. a kind of side bypassing excision high-pressure heater participation unit primary frequency modulation based on water side according to claim 2
Method is it is characterised in that described step 3) send instructions and close the vapour side of high-pressure heater and draw gas electrically operated gate and non-return flap.
5. a kind of side bypassing excision high-pressure heater participation unit primary frequency modulation based on water side according to claim 2
Method it is characterised in that join the Steam Turbine of vapour for sequence valve, using the method, when mains frequency drops to given threshold,
The bypass of triggering high-pressure heater water side excises high-pressure heater to participate in primary frequency modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610824264.8A CN106352321B (en) | 2016-09-14 | 2016-09-14 | The method that excision high-pressure heater participates in unit primary frequency modulation is bypassed based on water side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610824264.8A CN106352321B (en) | 2016-09-14 | 2016-09-14 | The method that excision high-pressure heater participates in unit primary frequency modulation is bypassed based on water side |
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| Publication Number | Publication Date |
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| CN106352321A true CN106352321A (en) | 2017-01-25 |
| CN106352321B CN106352321B (en) | 2019-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610824264.8A Active CN106352321B (en) | 2016-09-14 | 2016-09-14 | The method that excision high-pressure heater participates in unit primary frequency modulation is bypassed based on water side |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645062A (en) * | 2019-10-31 | 2020-01-03 | 大唐郓城发电有限公司 | Double-machine regenerative system participating in primary frequency modulation and operation method thereof |
| 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 |
| CN112904725A (en) * | 2021-01-19 | 2021-06-04 | 西安交通大学 | Control method for improving flexibility of coal-fired unit through high-pressure steam extraction throttling |
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| 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 |
| DE102012024526B4 (en) * | 2012-12-14 | 2014-09-25 | Witt Solar Ag | Solar thermal heat storage power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110645062A (en) * | 2019-10-31 | 2020-01-03 | 大唐郓城发电有限公司 | Double-machine regenerative system participating in primary frequency modulation and operation method thereof |
| 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 |
| CN112904725A (en) * | 2021-01-19 | 2021-06-04 | 西安交通大学 | Control method for improving flexibility of coal-fired unit through high-pressure steam extraction throttling |
| CN112904725B (en) * | 2021-01-19 | 2022-04-05 | 西安交通大学 | Control method for improving flexibility of coal-fired unit through high-pressure steam extraction throttling |
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| CN106352321B (en) | 2019-04-26 |
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