CN103717846B - The additional control for preheater for improvement of the equipment dynamic performance in steam power station and FREQUENCY CONTROL is drawn gas - Google Patents
The additional control for preheater for improvement of the equipment dynamic performance in steam power station and FREQUENCY CONTROL is drawn gas Download PDFInfo
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- CN103717846B CN103717846B CN201280031673.2A CN201280031673A CN103717846B CN 103717846 B CN103717846 B CN 103717846B CN 201280031673 A CN201280031673 A CN 201280031673A CN 103717846 B CN103717846 B CN 103717846B
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- power station
- preheater
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- water
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—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 only of turbine type
- F01K7/22—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 only of turbine type the turbines having inter-stage steam heating
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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
- F01K7/40—Use of two or more feed-water heaters in series
Abstract
The present invention relates to a kind of water-steam-return line drawn gas in method and steam power station of the preheater for steam power station.According to the present invention, the turbo machine of steam power station extracts high energy steam and is mixed into the low energy steam extracted on turbo machine.The vapour mixture be made up of low energy steam and the high energy steam be mixed into is provided to the preheater of steam power station, especially high pressure pre-heater, the especially last high pressure preheat stage of high pressure pre-heater, especially so that the feedwater of preheater is flow through in heating.By being mixed into high energy steam (drawing gas of control) to low energy steam especially closed loop and/or opened loop control, especially, when the partial load of steam power station, the quick change of power in steam power station is realized by the temperature change of low energy steam.
Description
Technical field
The present invention relates to a kind of method of drawing gas for preheater, in particular for the method for drawing gas of the especially high pressure pre-heater of the steam power station of coal-fired power plant, and relate to the water-steam-return line in steam power station.
Background technique
In addition, also such as from following Internet address hffp known steam power station or thermoelectricity plant: http://de.wikipedia.org/wiki/Dampfkraftwerk (on June 22nd, 2011 may have access to).
Steam power station is for the power plant type by fossil fuel power, is wherein kinetic energy by the thermal power transfer of water vapour in steam turbine, and in generator, is converted into electric energy further.
In this steam power station, first the water vapor needed for operation steam turbine is cleaned and water (feedwater) generation prepared by usually prior in steam boiler.By being heated further by steam in the superheater, the temperature of steam and specific volume raise.
Steam flow into steam turbine from steam boiler by pipeline, and the part of its prior obtained energy is outputted to turbo machine by steam herein.Turbo machine is connected with generator, and mechanical output is converted into electric power by described generator.
Then, release and cooling steam flow in coagulator, in coagulator steam by environment heat transfer condense and be collected as liquid water.
Thus, by condensation pump and preheater, by water intermediate storage in feed-water vessel, then again steam boiler is supplied to by feed water pump, with this closed-loop path.
Steam power station is divided into different types, such as, be divided into coal-fired power plant, oil fired power station, combustion gas and steam combination power station (GuD power station).
Coal-fired power plant is the specific type of steam power station, wherein coal as main fuel for generation of steam.The known this coal-fired power plant for brown coal and bone coal.
In this coal-fired power plant, according to the general loop of described steam power station, first brown coal or bone coal to be ground in coal pulverizer and dry.Then, in the firing chamber described brown coal or bone coal being blown into pulverized coal burner (staubfeuerung) and in this perfect combustion.The heat discharged thus absorbed by water tube boiler and by the water (feedwater) that supplies be converted to water vapor.
Water vapor is by pipeline flow-direction steam turbine, and wherein the part of its energy is exported to turbo machine by release as kinetic energy by water vapor.Then, by the generator be connected on turbo machine, mechanical output is converted into electric power, described electric power is fed in electrical network as electric current.
Usually, the coagulator in turbo machine arranged beneath, in coagulator, the heat of its largest portion is passed to cooling water by steam after release in turbo machine.During this process, steam is by condensation liquefaction.
The liquid water of formation is transported in water tube boiler as feedwater by feed water pump again, is closed loop with this.
The information such as measured value, process data or the status data that all occur in steam power station or coal-fired power plant show in the console and usually herein to assess in central computer, wherein show, assess, control, regulate and control and/or control the running state of independent power plant component.
By control mechanism, power station staff can get involved the operational process of coal-fired power plant, such as, by opening or closing solenoid valve or valve, or by changing the fuel quantity supplied.
The center constituent element of this operating console is computer, described computer implements unit control system (blockf ü hrung), central authorities' regulation and control and controls and/or control unit, the control of steam or coal-fired power plant, regulation and control and/or control can be performed by this.
In deregulated electricity market, the flexible load operation of power station and the device for FREQUENCY CONTROL in electrical network more and more important for power-plant operation.
Dissimilar FREQUENCY CONTROL is there is, the primary control in the so-called dead band of such as with or without and secondary control in the FREQUENCY CONTROL of electrical network.
Because electric energy can not be stored in the road from the producer to consumer, so generating and power consumption all must be in balance all the time in electrical network, namely must accurately send as the electric energy of amount that consumes.The frequency of electric energy is overall controlled quentity controlled variable at this, as long as and generating and power consumption are in balance then adopts network rating value.Network is synchronous to be therewith connected to the rotating speed of the power station generator on electrical network.
If there is generation deficiency in certain moment in electrical network, then first this deficiency is met by the energy comprised in the flywheel of rotating machinery (turbo machine, generator).Thus, braking machine, therefore machine rotating speed and therefore (network) frequency reduce further.
If do not overcome this network by power suitable in electrical network or FREQUENCY CONTROL to reduce, then mains breakdown will be caused.
In described dead band, in the inherent normal condition of the scope of the less frequency departure up to ± 0.07 to 0.1Hz, do not carry out any control intervention.The reply slowly that only can realize postponing in this region controls to compensate the deviation of producing and existing between consumption.
In the scope of 0.1 to 3.0Hz such as because power plant failure and power consumption fluctuate the larger frequency departure that causes by dividing in whole electrical network respectively for the primary control of the power station participating in primary control.Namely this be automatically provided to the margin of power on electrical network for herein is provided so-called primary control deposit by the electric field being participated in, therefore to compensate the imbalance between producing and consuming by production control in one second.
Therefore, under primary control is used for that network is stabilized in the little deviation of most probable, but in the level being different from network rating value given in advance.
The task of being connected to the secondary control on primary control is the balance formed in electrical network further between generating and power consumption, and therefore makes network turn back to frequency rating value given in advance, such as 50Hz.
For this reason, the power station participating in secondary control provides secondary control deposit, network is turned back to network rating value, and again forms balance in electrical network.
The requirement of primary control and primary control deposit to be outputted in electrical network and are automatically realized (frequency shift in this electrical network or electrical network require that primary control deposit) by the power station control gear participating in primary control, and secondary control is required by the generating factory and office that NC network controller is participating in primary control being arranged in higher level in electrical network, and then outputted in electrical network by power station under this requires.
Partly, for the FREQUENCY CONTROL deposit of power station and elementary and/or secondary control deposit when provided by national regulation certain be obligatory; The control deposit provided by power station provides compensation usually used as special grid service to power station.
Certainly for the large-scale modernization thermoelectricity plant with the usual supercritical steam generator worked under basic load is run, participation FREQUENCY CONTROL or not substantially load operation are attractive economically.Along with the reconstruction of renewable energy sources (wind energy), even if be also tending towards sharpening for the requirement of the controllability of unit of big power station.
In addition known, with wherein power when needed in the rank of a second compared with retrievable pumping up power plant or gas power plant, such as, the power from any power points when FREQUENCY CONTROL required by coal-fired power plant raises obviously slower (" power inertia ").
In coal-fired power plant, the reason of this " power inertia " is bunker coal " thermal inertia ".Namely, namely the change of coal burning only causes the power of coal-fired power plant to change (change of the change of the useful horsepower of coal-fired power plant or the thermal power (process vapor) of separation) after longer delay after the delay of several minutes ranks, and first this be due to the supply of time-consuming coal and broken process.Therefore only can be provided to time lag in corresponding electrical network or power distribution network as the power when controlling deposit and power raise.
Although, the power gradient can run by coal-fired power plant in this way or power gradient are medium, but networking condition must meet the transmission of electricity regulation (minimum requirements) come into force in Germany at present, such as, primary control deposit needed for internal power rising 2% in 30 seconds.
As long as realize ratio according to the higher frequency deposit of national legislation minimum requirements and elementary and/or secondary control deposit in coal-fired power plant, then this can make coal-fired power plant operator obtain corresponding higher income.
In addition, some countries propose than for the higher power gradient of the networking requirements of its network or FREQUENCY CONTROL deposit according to the structure of network size and generator unit from concrete condition.Such as, UK Grid laws and regulations requirement raises the power of 10% in 10 seconds.
For accelerating power change in frequency and elementary and/or secondary control in coal-fired power plant's situation, the addition thereto (" FlexibleLoadOperationandFrequencySupportforSteamTurbineP owerPlants " of known use snap action, Wichtmann etc., VGBPowerTech7/2007, 49-55 page), described addition thereto is based on using in the process medium of coal-fired power plant the energy namely feeding water or comprise in water vapor, as the throttling of high pressure turbine control valve, the overload of high-pressure section turbo machine is introduced, coagulator blocks, detour and lead to the throttling of the steam line that draws gas of high pressure pre-heater in the feedwater side of high pressure pre-heater.
Certainly, the intrinsic energy accumulator of this process medium is restricted, and available control deposit thus is also restricted.In addition, the range of operation that can realize FREQUENCY CONTROL in it is also correspondingly restricted.
In addition known appearance burning interference in steam power station or coal-fired power plant, this causes jiggly equipment to run.At this, task is this interference of balance or runs fluctuation, runs and optimized device dynamic performance with stabilizing equipment.
Usually, the balance of this interference or fluctuation is by correspondingly changing burning to realize.That is, use causes the controlled quentity controlled variable disturbed to make interference balancing.This balance also causes jiggly equipment to run.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method and apparatus realizing improving the dynamic device performance of the steam power station of especially coal-fired power plant.Technical problem to be solved by this invention is also to improve the FREQUENCY CONTROL in steam power station or coal-fired power plant, and especially improve power and change speed and/or power range, namely power controls deposit.
This technical problem by the feature of the with good grounds each independent claims of band, especially preheater water-steam-return line especially in the method for drawing gas of high pressure pre-heater and the steam power station of especially coal-fired power plant of the steam power station of coal-fired power plant realize.
According to by method of the present invention, the turbo machine of steam power station extracts high energy steam, and described high energy steam is mixed in the low energy steam extracted on turbo machine.
At this, relative concept " height " and " low " are interpreted as the steam extracted relative to two respectively.Therefore, the mixing of extraction steam than extract, be mixed into the steam of high energy steam more high energy.Therefore, the steam be mixed into such as extracted has the pressure higher than the steam to be mixed into extracted and/or higher temperature.
At this, can use flow in turbo machine or fresh steam in high pressure turbine as upwards limited as the richness that can be mixed into can steam.Associatedly, turbo machine draws gas, and being also interpreted as draws gas not only directly carries out on turbine/turbo machine entrance or on high pressure turbine/high-pressure turbine inlet, and carries out guiding on the fresh steam pipeline in turbo machine or in high pressure turbine.
The vapour mixture be made up of low energy steam and the high energy steam be mixed into is provided to the preheater of the especially high pressure pre-heater of steam power station, especially so that the feedwater of preheater is flow through in heating.Providing to last high pressure pre-heater level is especially provided.
By high energy steam to the especially closed loop of low energy steam and/or being mixed into (control is drawn gas) of opened loop control, in the power controlling run of steam power station, especially realize the quick change of power in steam power station by the temperature change of low energy steam.Especially, when the present invention uses continuously in equipment runs, different from normal conditions, correspondingly do not follow the tracks of burning when burning interference, but by running stability that the present invention improves equipment.
Drawing gas of controlling means by open/close control the high energy steam of extraction is accurately quantitative to the mixing of the low energy steam extracted at this, such as accurately quantitative by the flow of the high energy steam accurately controlling extraction.As the controlled quentity controlled variable that this controls, economizer inlet temperature or feed temperature can be used.Open/close can be implemented in this unit control system at equipment.
In the water-steam-return line of steam power station according to the present invention, the preheater of turbo machine and especially high pressure pre-heater is arranged in water-steam-return line.
This preheater is known as high pressure pre-heater or low pressure preheater (LPP.Usually, respectively this high pressure multiple or low pressure preheater (LPP are configured to (preheating) level in succession, multiple (temperature) level that is heated by of the feedwater be wherein herein guided (high pressure pre-heater) or condensed water (low pressure preheater (LPP) is carried out.
In addition, the first bleed steam pipework is connected with turbo machine, can extract high energy steam with described first bleed steam pipework on turbo machine.Second bleed steam pipework is also connected with turbo machine, can extract low energy steam with described second bleed steam pipework on turbo machine.
First and second bleed steam pipeworks are connected by the mixing apparatus of such as simple pipeline connecting element, with described mixing apparatus, the high energy steam from the first bleed steam pipework and the low energy steam from the second bleed steam pipework can be mixed.
Supply pipeline is connected with mixing apparatus and preheater, vapour mixture by high energy steam and low energy vapour composition can be supplied to preheater especially high pressure pre-heater with described supply pipeline, especially last high pressure pre-heater level is supplied to, especially so that the feedwater of preheater is flow through in heating.
At this, last high pressure pre-heater level refers to finally to be left in the feedwater thereafter from preheating and to be fed into the high pressure pre-heater of steam generator.
In brief, invention proposes the low energy steam high energy steam extracted on turbo machine being mixed into and extracting on turbo machine, wherein increase the energy of low energy steam, especially increase the temperature and pressure of low energy steam.Vapour mixture is in particular for heating high-pressure preheater or the feedwater being directed through high pressure pre-heater.
Especially, heat and carry out in last high pressure pre-heater level (also referred to as high pressure preheat stage).
By the participation of multiple or whole high pressure pre-heater, corresponding temperature gradient can be limited, and therefore ensure the equipment method of operation of corresponding protectiveness.In other words, multiple control according to the present invention is provided to draw gas at least last high pressure pre-heater, if needs are for multiple or whole high pressure pre-heater at this.
What to low energy, high energy steam drew gas that the open/close of steam controls is mixed into (drawing gas of control) and especially can be raised by the temperature of the steam that draws gas in the partial load run of equipment and realize the quick of equipment and autotelic power change.Associatedly, " fast " is interpreted as that power raises at short notice, can experience large forward power gradient.At this, " autotelic " means that power changes to power rating open/close given in advance with controlling.
Can in the FREQUENCY CONTROL of the especially steam power station of coal-fired power plant and elementary and/or secondary control at this, or in the burning interference of steam power station, require power to change or power raises.
Therefore, power raises and can especially be in the scope of 2% to 15% of rated power, especially preferably can be in its scope of 2% to 10%.
This power raises especially in the time range of 5 to 600 seconds, especially preferably sets up in the time range of 5 to 30 seconds.Then, during additional power can remain on the other time period in the scope of at least 5 to 50 points, especially during the time period of 5 to 30 points.
Unit control system carries out open/close control by the economizer inlet temperature of controlled quentity controlled variable that controls as open/close or feedwater final temperature.
The present invention has confirmed it is obviously favourable in many aspects.
Can in an advantageous manner and in the steam power station of especially coal-fired power plant, improve dynamic device performance and FREQUENCY CONTROL in advantageously simple mode by the present invention.
Especially, combine with the known means changed for accelerating power in the FREQUENCY CONTROL in coal-fired power plant and elementary and/or secondary control, therefore can amplification frequency be controlled and elementary and/or secondary control range by the present invention.Also by running stability that the present invention improves equipment.Especially, when lasting use is of the present invention, for balancing little burning interference, and different from normal conditions, correspondingly do not follow the tracks of burning.
By the participation of multiple or whole high pressure pre-heater, corresponding temperature gradient can be limited and therefore ensure the equipment method of operation of correspondingly protectiveness.
Preferred expansion of the present invention also obtains from each dependent claims.Described expansion relates to method and equipment.
According to a preferred expansion scheme, high energy steam especially extracts in the identical turbine section of turbo machine with low energy steam on the high-pressure section or intermediate pressure section of turbo machine.
Also can advise, by using vapour mixture, by the feedwater in high pressure pre-heater especially in last high pressure preheat stage or also by the condensed water heating in low pressure preheater (LPP.
In other preferred expansion scheme, high energy steam to the mixing of low energy steam by closed loop and/or opened loop control, especially by steam power station unit control system and carry out described closed loop and/or opened loop control especially by use economizer inlet temperature or feedwater final temperature as controlled quentity controlled variable.
In addition, the temperature that the present invention is used for raising extracted low energy steam and/or pressure can be advised, wherein by high energy steam is mixed into low energy steam, temperature is increased and especially opens up to about 20 and/or pressure is increased especially up to about 5 bar.
Also the present invention can be used for steam power station, quick, the autotelic power of steam power station that especially runs in partial load raises, the temperature that wherein power is raised through the low energy steam extracted raises and caused.
In addition, the present invention can be used in the FREQUENCY CONTROL in steam power station, especially can be used in secondary and/or primary control, wherein by high energy steam is mixed into low energy steam, the power fast that the power that result in steam power station required in and/or primary control especially secondary for FREQUENCY CONTROL changes changes, and/or by high energy steam is mixed into low energy steam, be exaggerated the refrequency control range in steam power station, be especially exaggerated elementary and/or secondary control range.
In addition, the present invention can be used for improving the running stability in steam power station, and the burning interference wherein in steam power station is changed by fast power and realizes, and is mixed into balance by high energy steam to the closed loop of low energy steam and/or opened loop control.
The present invention also can except by using energy contained in the process medium of steam power station to use except increased wattage in steam power station, especially except high pressure turbine control valve throttling, introduce to the overload of high-pressure section turbo machine, coagulator blocks, detour in the feedwater side of high pressure pre-heater and/or lead to high pressure pre-heater the steam line that draws gas throttling except use.
The present invention also uses sustainably in the operation of steam power station, especially uses in partial load run, and the burning for equilibrium vapor power station is disturbed.
In other preferred expansion scheme, water-steam-return line and/or mixing apparatus have the open/close control apparatus especially implemented in the unit control system of steam power station, with described open/close control apparatus, especially by using economizer inlet temperature or feedwater final temperature can the mixing of closed loop and/or opened loop control high energy steam and low energy steam as controlled quentity controlled variable.
In addition, can advise according to especially preferred expansion scheme, the unit that water-steam-return line at least two is made up of the first bleed steam pipework, the second bleed steam pipework, mixing apparatus and supply pipeline respectively, and each of at least two unit can be used to be preheater especially high pressure pre-heater supply vapour mixture.
Can advise further at this, the second bleed steam pipework of first module is also the first bleed steam pipework of second unit.With this, the vapour mixture supply of cascade shape can be realized, it reduce the demand for additional pipeline.
Especially preferably can provide multiple this element, described multiple or whole high pressure pre-heater, but at least last high pressure pre-heater level is provided to each vapour mixture.By the participation of multiple or whole high pressure pre-heater, corresponding temperature gradient can be limited and therefore ensure the equipment method of operation of corresponding protectiveness.
In addition, the steam power station had according to water-steam-return line of the present invention can be provided, especially coal-fired power plant.
Accompanying drawing explanation
Illustrate embodiments of the invention in the accompanying drawings, described embodiment is further explained in detail.
Each figure is:
Fig. 1 shows the water-steam-return line in coal-fired power plant according to an embodiment of the invention,
Fig. 2 shows the detail section (HD turbine section) of the water-steam-return line according to Fig. 1,
Fig. 3 shows the other detail section (MD turbine section) of the water-steam-return line according to Fig. 1.
Embodiment
Embodiment: (Fig. 1 to Fig. 3) is drawn gas in the additional control for high pressure pre-heater being used for improving equipment dynamic performance in steam power station (coal-fired power plant) and FREQUENCY CONTROL.
Fig. 1 and Fig. 2 and Fig. 3 shows water-steam-return line and the detail section thereof of coal-fired steam power station 1.
In this coal-fired steam power station 1 (referred to as coal-fired power plant 1), grind in coal pulverizer and drying brown coal and bone coal according to common coal burning.Then, in combustion space brown coal and bone coal being blown into pulverized coal burner (staubfeuerung) and perfect combustion herein.
Therefore the heat discharged absorbed by water tube boiler (referred to as steam generator 2) and by the water (feedwater) 3 that is fed to be converted to water vapor/high pressure steam 4.
The high pressure steam 4 generated in steam generator 2 enters in the high-pressure section 11 of steam turbine 10, and does mechanical work at its place by release and cooling.
For reaching high total efficiency, steam to be guided to again in steam generator 2 and by intermediate superheating after leaving high-pressure section 11.Overheated steam is fed into again turbo machine 10 in double-current method intermediate pressure section 12, and does mechanical work further by further release and cooling.
After leaving intermediate pressure section 12, vapor flow has in the low-pressure section 13,14 of double-current method structure to two of steam turbine 10 respectively, in described low voltage section office by release be cooled to exhaust pressure level to do mechanical work further.
Then, by being connected in the generator 20 on turbo machine 10, mechanical output is converted into electric power, described electric power is fed in electrical network 21 in the form of electric current.
Exhaust steam from turbo machine condenses by means of main cooling water in coagulator 30.The main condensate occurred is provided to low pressure (ND)-preheater 40 and feed-water vessel 50 by main condensate pump, and this in preheat stage 42 respectively with from turbo machine 10 and steam 41 preheating of drawing gas of the low-pressure section 13,14 respectively from two of turbo machine 10 with double-current method structure.
Two feed water pumps obtain required feedwater 51 from feed-water vessel 50, and by this feedwater 51 by raised pressure with heat in high pressure (HD)-preheater 60 further and provide and get back to steam generator 2.For heating uses again the steam 61 that draws gas from turbo machine 10 and draw gas steam 61 and the intermediate pressure section 12 from the high-pressure section 11 of turbo machine 10 and double-current method structure from turbo machine 10.
For realizing high total efficiency, the preheating path configuration be made up of ND-preheater 40 and HD-preheater 60 is multistagely respectively with multiple ND-preheater 42 and HD-preheater 62.
Fig. 2 and Fig. 3 shows as HD-preheater 60,62,63,64,65 supplies with the steam 78,79 and 95 (Fig. 3) that draws gas of draw gas steam 61 (Fig. 2) and the double-current method intermediate pressure section 12 from turbo machine 10 of the high-pressure section 11 from turbo machine 10.
As shown in FIG. 2, be in three positions 71,72,73 of the high-pressure section 11 of turbo machine 10 respectively on turbo machine 10 and extract (drawing gas) steam 75,76,77.
To draw gas steam 75 at first the draw gas high energy of position 71 being derived turbo machine 10 of entry position 74 near the high-pressure section 11 entering turbo machine 10, the described high energy steam 75 that draws gas is provided to by controlled flow dontroller 80 and draws gas the drawing gas the steam 76 of low energy compared with steam 75 with described high energy of position 72 place extraction second with being controlled.This vapour mixture 78 or this steam 78 that draws gas are provided to the last high pressure pre-heater level 63 of HD-preheater 60 so that preheating feedwater 51.
Further as shown in FIG. 2, second of turbo machine 10 draw gas position 72 or turbo machine 10 high pressure stage 11 on the steam 76 that draws gas that obtains to be provided to being controlled by controlled flow dontroller 80 the 3rd draw gas derivation on position 73, compared with the described steam 76 that draws gas the steam 77 of low energy.This vapour mixture 79 or this steam 79 that draws gas are provided to the penultimate high pressure pre-heater level 64 of HD-preheater 60 so that preheating feedwater 51.
As shown in FIG. 3, (drawing gas) steam 93,94 is also extracted respectively in two positions 91,92 of the intermediate pressure section 12 of turbo machine 10.
By deriving the steam 93 that draws gas of turbo machine 10 in this first position 91 of drawing gas, described in draw gas steam 93 (by controlled flow dontroller 80) be provided to controllably this second draw gas position 92 is derived, compared with the described steam 93 that draws gas the steam 94 of low energy.This vapour mixture 95 or this steam 95 that draws gas be provided to be in two high pressure pre-heater levels 63 and 64 front, the high pressure pre-heater level 65 of HD-preheater 60 is so that preheating feedwater 51.
The controlled quentity controlled variable that the open/close of mixture controls to be controlled using the final temperature that feeds water as open/close by the unit control system of equipment by controlled flow dontroller 80 is carried out.
The flow guide of fluid is undertaken by the pipe-line system 82 of complicated pipeline 82 or complexity, and this is also at the obstacle controlling additionally to provide in the scope of drawing gas for flow guide.
Therefore, this respectively pressure is high and that temperature is high control draw gas (75 to 76) and (76 to 77) and (93 to 94) be supplied to three high pressure pre-heater levels 63,64 and 65 use, at least for the highest high pressure pre-heater level 63.By rich can control draw gas, in each vapour mixture, achieve temperature to increase respectively to open up to about 20 and pressure to be increased up to about 5 bar.
The each low energy that high energy steam 75,76,93 is mixed into controlled by this open/close draws gas that (hybrid mode is steam 76,77,94: 75 to 76; 76 to 77; 93 to 94), especially in the partial load run of coal-fired power plant 1, the quick of equipment and autotelic power change is realized by the temperature change of the steam that draws gas.
By the participation of multiple or whole high pressure pre-heater, the participation of high pressure pre-heater level 63,64,65 in this case, can limit corresponding temperature gradient and therefore ensure the equipment method of operation of corresponding protectiveness.
Therefore, can with effectively and simple mode improves dynamic device performance in coal-fired power plant and FREQUENCY CONTROL.
Therefore, combine with the known means changed for accelerating power in the FREQUENCY CONTROL in coal-fired power plant and elementary and/or secondary control, such as can amplification frequency control range and elementary and/or secondary control range.Especially when this measure of lasting use, the operation stability that also can therefore improve equipment, to balance little burning interference, and different from normal conditions, correspondingly do not follow the tracks of burning.
Claims (18)
1. the method for drawing gas of the preheater for the steam power station of fire coal, wherein, the turbo machine of steam power station extracts high energy steam and is mixed into the low energy steam extracted on turbo machine, and the vapour mixture be made up of low energy steam and the high energy steam be mixed into is provided to the preheater of steam power station, so that the feedwater of preheater is flow through in heating, it is characterized in that, closed loop and/or opened loop control ground perform, by the unit control system of steam turbine and by performing the mixing of described high energy steam to low energy steam with being used as the economizer inlet temperature of controlled quentity controlled variable or feedwater final temperature closed loop and/or opened loop control.
2. according to the method in claim described in 1, it is characterized in that, described high energy steam extracts in the identical turbine section of described turbo machine with described low energy steam.
3. method according to claim 1 and 2, is characterized in that, by using the feedwater in described vapour mixture heating high-pressure preheater or the condensed water in low pressure preheater (LPP.
4. method according to claim 1 and 2, temperature, for raising temperature and/or the pressure of extracted low energy steam, wherein by high energy steam is mixed into low energy steam, is increased 20 and opens and/or pressure is increased 5 bar by described method.
5. method according to claim 1 and 2, quick, the autotelic power that described method is used for steam power station changes, and wherein, the temperature rising that described power changes the low energy steam by extracting caused.
6. method according to claim 1 and 2, described method is used for the secondary and/or primary control in steam power station, wherein by high energy steam is mixed into low energy steam, the power that result in for steam power station required in secondary and/or primary control raises fast, and/or by described high energy steam is mixed into described low energy steam, be exaggerated the elementary and/or secondary control range in steam power station.
7. method according to claim 1 and 2, described method is for improving the running stability in steam power station, and the burning interference wherein in steam power station is by being changed by high energy steam to the closed loop of low energy steam and/or the fast power being mixed into realization of opened loop control and balance.
8. method according to claim 1 and 2, high-power supplementing is carried by contained energy in using process medium as in steam power station, described method is used constantly, to balance the burning interference of described steam power station in the partial load run of steam power station.
9. method according to claim 2, is characterized in that, described turbine section is high-pressure section or the intermediate pressure section of described turbo machine.
10. method according to claim 1 and 2, is characterized in that, heats the feedwater in the high pressure pre-heater of most rear class or the condensed water in low pressure preheater (LPP by using described vapour mixture.
11. methods according to claim 1 and 2, is characterized in that, quick, the autotelic power that described method is used for the steam power station run in partial load changes, and wherein, the temperature rising that described power changes the low energy steam by extracting caused.
12. methods according to claim 8, it is characterized in that, described in propose throttling that high-power measure is high pressure turbine control valve, introduce to the overload of high-pressure section turbo machine, coagulator blocking, high pressure pre-heater feedwater side detour and/or lead to the throttling of the steam line that draws gas of high pressure pre-heater.
Water-steam-return line in 13. 1 kinds of steam power stations, with the turbo machine be arranged in water-steam-return line and with the preheater be arranged in water-steam-return line, wherein, described water-steam-return line has:
-the first bleed steam pipework, described first bleed steam pipework is connected with described turbo machine, and can extract high energy steam on described turbo machine with described first bleed steam pipework,
-the second bleed steam pipework, described second bleed steam pipework is connected with turbo machine, and can extract low energy steam on described turbo machine with described second bleed steam pipework,
-the mixing apparatus that connects with the first and second bleed steam pipeworks, can by from the high energy steam of described first bleed steam pipework and the low energy vapor mixing from described second bleed steam pipework with described mixing apparatus, and
-the supply pipeline that is connected with described mixing apparatus and described preheater, vapour mixture by high energy steam and low energy vapour composition can be provided to preheater with described supply pipeline, so that the feedwater of preheater is flow through in heating, it is characterized in that, described water-steam-return line and/or described mixing apparatus have the open/close control apparatus implemented in the unit control system of steam power station, using described open/close control apparatus by using economizer inlet temperature or feedwater final temperature as the mixing of controlled quentity controlled variable energy closed loop and/or opened loop control high energy steam and low energy steam.
14. water-steam-return lines according to claim 13, it is characterized in that, described water-steam-return line has at least two unit be made up of described first bleed steam pipework, described second bleed steam pipework, described mixing apparatus and described supply pipeline respectively, and uses each of at least two unit to supply each vapour mixture for preheater.
15. water-steam-return lines according to claim 13, is characterized in that, described second bleed steam pipework of first module is also described first bleed steam pipework of second unit.
16. water-steam-return lines according to claims 14 or 15, described water-steam-return line is with multiple unit, and described multiple unit provides with each vapour mixture to multiple high pressure pre-heater.
17. water-steam-return lines according to claims 14 or 15, described water-steam-return line is with multiple unit, and described multiple unit provides with each vapour mixture to the high pressure pre-heater of at least last level.
18. a steam power station, described steam power station is with according to claim 13 to water-steam-return line described one of in 17.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011078193.5 | 2011-06-28 | ||
| DE201110078193 DE102011078193A1 (en) | 2011-06-28 | 2011-06-28 | Additional control tap for a preheater to improve the system dynamics and frequency control in a steam power plant |
| PCT/EP2012/061278 WO2013000720A2 (en) | 2011-06-28 | 2012-06-14 | Additional controlled extraction for a preheater for improving the plant dynamics and the frequency regulation in a steam power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103717846A CN103717846A (en) | 2014-04-09 |
| CN103717846B true CN103717846B (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280031673.2A Expired - Fee Related CN103717846B (en) | 2011-06-28 | 2012-06-14 | The additional control for preheater for improvement of the equipment dynamic performance in steam power station and FREQUENCY CONTROL is drawn gas |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2712393A2 (en) |
| CN (1) | CN103717846B (en) |
| DE (1) | DE102011078193A1 (en) |
| RU (1) | RU2014102615A (en) |
| WO (1) | WO2013000720A2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2876266A1 (en) * | 2013-11-21 | 2015-05-27 | Siemens Aktiengesellschaft | Arrangement for removal of steam from a steam turbine |
| DE102018100712A1 (en) | 2018-01-15 | 2019-07-18 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Steam power plant and method for operating a steam power plant |
| CN112805454A (en) * | 2018-09-27 | 2021-05-14 | 西门子能源环球有限责任两合公司 | Fluid mechanical device and method for operating a fluid mechanical device |
| CN109653819B (en) * | 2019-01-24 | 2023-10-24 | 中国电力工程顾问集团东北电力设计院有限公司 | Deep peak-shaving steam turbine system of cogeneration unit and control method |
| 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 |
| CN115218245B (en) * | 2022-07-21 | 2023-07-28 | 西安热工研究院有限公司 | Control method and system for improving flexibility of unit through heat supply and steam extraction throttling |
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| CN102192639A (en) * | 2010-03-09 | 2011-09-21 | 天华化工机械及自动化研究设计院 | Method for reducing coal consumption of coal-fired power plant by adding fluidized bed drying system |
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- 2011-06-28 DE DE201110078193 patent/DE102011078193A1/en not_active Ceased
-
2012
- 2012-06-14 EP EP12729098.9A patent/EP2712393A2/en not_active Withdrawn
- 2012-06-14 CN CN201280031673.2A patent/CN103717846B/en not_active Expired - Fee Related
- 2012-06-14 RU RU2014102615/06A patent/RU2014102615A/en not_active Application Discontinuation
- 2012-06-14 WO PCT/EP2012/061278 patent/WO2013000720A2/en active Application Filing
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| US3238729A (en) * | 1962-07-23 | 1966-03-08 | Ass Elect Ind | Steam turbine power plants |
| DE3616797C2 (en) * | 1986-05-17 | 1988-08-04 | Koerting Hannover Ag, 3000 Hannover, De | |
| US5404724A (en) * | 1994-04-07 | 1995-04-11 | Westinghouse Electric Corporation | Boiler feedpump turbine drive/feedwater train arrangement |
| DE19535318C2 (en) * | 1995-09-22 | 1997-11-27 | Steag Ag | Method and arrangement for preheating the feed water of a steam generator in power plant processes |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102011078193A1 (en) | 2013-01-03 |
| WO2013000720A2 (en) | 2013-01-03 |
| WO2013000720A3 (en) | 2013-12-19 |
| RU2014102615A (en) | 2015-08-10 |
| EP2712393A2 (en) | 2014-04-02 |
| CN103717846A (en) | 2014-04-09 |
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