CN106246251A - Combined cycle thermoelectric co-feeding system and height thereof arrange control method of drawing gas - Google Patents
Combined cycle thermoelectric co-feeding system and height thereof arrange control method of drawing gas Download PDFInfo
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- CN106246251A CN106246251A CN201610920097.7A CN201610920097A CN106246251A CN 106246251 A CN106246251 A CN 106246251A CN 201610920097 A CN201610920097 A CN 201610920097A CN 106246251 A CN106246251 A CN 106246251A
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
- F01K7/24—Control or safety means specially adapted therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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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
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
- F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
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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
- F01K7/26—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 accumulation
- F01K7/28—Control means specially adapted therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The present invention relates to steam turbine technology field, particularly relate to a kind of combined cycle thermoelectric co-feeding system and height arranges control method of drawing gas, high pressure exhaust steam pressure measuring point is set at the steam drain of high pressure cylinder, extraction line arranges after extraction control valve extraction pressure measuring point, in be pressed on steam pipe road in be pressed into steam valve group before arrange in be pressed into steam pressure measuring point；Under operating mode of drawing gas, extraction pressure setting value is determined by the heat demand of heat supply network, the actual pressure value recorded by high pressure steam discharge measuring point is pressed into steam pressure setting value in determining, control system according to the actual pressure value recorded at extraction pressure setting value and extraction pressure measuring point the aperture of extraction control valve is adjusted and/or according in be pressed into steam pressure setting value and in be pressed into the actual pressure value centering recorded at steam pressure measuring point and be pressed into the aperture of steam valve group and be adjusted, make the actual pressure value at extraction pressure measuring point reach extraction pressure setting value.Unit internal efficiency can be effectively improved, reduce high-quality energy waste.
Description
Technical field
The present invention relates to steam turbine technology field, particularly relate to a kind of combined cycle thermoelectric co-feeding system and high row draws gas
Control method.
Background technology
Steam turbine is one of crucial power-equipment in power plant construction, is to convert thermal energy into mechanical energy and then be converted into electricity
The energy conversion device of energy.The high temperature that produced by boiler, high steam, through steam turbine, change heat energy with pressure potential
Becoming the mechanical energy of steam turbine, drive the acting of turbine rotor output shaft, this mechanical energy is passed to by turbine rotor output shaft
Electromotor, thus convert mechanical energy into electric energy.
Gas-steam Combined Cycle refers to gas turbine as preposition turbine, reclaims gas turbine with waste heat boiler
Exhaust heat, some grades of initial steams of output inject steam turbines, steam expansion work export electric energy in steam turbine.Combustion gas-
Steam Combined Cycle is having the gas turbine of higher average endothermic temperature and the steam turbine with relatively harmonic(-)mean exothermic temperature
Combine, make the high-temperature tail gas of gas turbine enter waste heat boiler and produce steam, and make steam continue acting in steam turbine
Generating, reaches the purpose maximized favourable factors and minimized unfavourable ones, mutually make up, makes the heat energy utilization level of whole combined cycle have compared with simple cycle bright
Aobvious raising.The net efficiency of combined cycle generation is up to 48%～62%.
At present conventional combined cycle system double pressures widely used just like E level circulating power station, without reheat system and F
Level circulating power station used three pressure, reheat system.The former net efficiency that generates electricity is about 50%, and the latter's net efficiency that generates electricity exists
More than 58%.Additionally, also generating efficiency H level combined cycle system more than 60%.Thermoelectricity (cold) coproduction, refers at steamer
Extracting a part of steam at the through-flow suitable location within of machine out and be used for factory steam, original intention is the rational gradient realizing the energy
Utilizing, the combined cycle efficiency of cogeneration of heat and power can reach more than 70%.
But, the operating mode of drawing gas of existing combined heat and power blood circulation yet suffers from that unit internal efficiency is on the low side, high-quality energy
The problem of source waste, needs a kind of draw gas control and guard method being applicable to high row's steam bleeding system badly, with improve unit internal efficiency,
Reduce high-quality energy waste.
Summary of the invention
The technical problem to be solved in the present invention is to provide one and can improve unit internal efficiency, reduce high-quality energy waste
Combined cycle thermoelectric co-feeding system and high row draw gas control method, to overcome the drawbacks described above of prior art.
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that a kind of combined cycle thermoelectric co-feeding system
High row draw gas control method, high pressure exhaust steam pressure measuring point is set at the steam drain of high pressure cylinder, draw gas on extraction line tune
Joint valve after extraction pressure measuring point is set, in be pressed on steam pipe road in be pressed into steam valve group before arrange in be pressed into steam pressure measuring point；?
Draw gas under operating mode, the heat demand of heat supply network determine extraction pressure setting value, high pressure steam discharge measuring point the actual pressure recorded
Value is pressed into steam pressure setting value in determining, control system is according to the reality recorded at extraction pressure setting value and extraction pressure measuring point
Force value the aperture of extraction control valve is adjusted and/or according in be pressed into steam pressure setting value and in be pressed into steam pressure measuring point
The actual pressure value centering that place records is pressed into the aperture of steam valve group and is adjusted, and makes the actual pressure value at extraction pressure measuring point reach
To extraction pressure setting value.
Preferably, setting is pressed into steam pressure protection value, in be pressed into during steam pressure setting value is not less than and be pressed into vapour pressure and try hard to keep
Protect value；In the middle of be pressed into during the actual pressure value recorded at steam pressure measuring point drops to when being pressed into steam pressure protection value, in be pressed into vapour
The aperture of valve group is the Minimal Protective aperture under operating mode of drawing gas, and does not continues to reduce.
Preferably, after entering operating mode of drawing gas, first increasing the aperture of extraction control valve, the aperture at extraction control valve increases to
After maximum opening, first improve gas turbine load, then be pressed into steam valve in gas turbine load improves and reduces to peak load
The aperture of group, until the actual pressure value recorded at extraction pressure measuring point reaches extraction pressure setting value.
Preferably, after entering operating mode of drawing gas, first increasing the aperture of extraction control valve, the aperture at extraction control valve increases to
After maximum opening, in first reducing, be pressed into the aperture of steam valve group, then in be pressed into the aperture of steam valve group and be decreased to Minimal Protective aperture
Rear raising gas turbine load, until the actual pressure value recorded at extraction pressure measuring point reaches extraction pressure setting value.
Preferably, setting high pressure exhaust steam pressure minimum, the actual pressure value recorded at high pressure steam discharge measuring point drops to
When actual pressure value at high pressure exhaust steam pressure minimum and extraction pressure measuring point is not up to extraction pressure setting value, improve combustion gas
Turbine load or be pressed into steam valve group in progressively closing off.
Preferably, high pressure exhaust steam pressure measuring point, extraction pressure measuring point and in be pressed into steam pressure measuring point and be respectively equipped with three.
Preferably, control system regulates adoption rate integral adjustment, control system centering pressure to the aperture of extraction control valve
The aperture regulation adoption rate droop control of inlet valve group.
Preferably, the connection pipeline between middle pressure superheater and reheater is provided with pressure retaining valve, control system according in
The higher value in the control variable of pressure drum pressure rate of change and the control variable of the middle pressure drum pressure value aperture to pressure retaining valve
It is adjusted, the feed-forward signal regulated as pressure retaining valve aperture using the valve position signal of extraction control valve.
In order to solve above-mentioned technical problem, the present invention also adopts the following technical scheme that a kind of combined cycle thermoelectric alliance system
System, including high pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, reheater and control system, the steam drain of high pressure cylinder by high-pressure exhaust pipe road with
The entrance connection of reheater, is provided with the extraction line towards heat supply network on high-pressure exhaust pipe road, and extraction line is provided with the tune that draws gas
Joint valve；The outlet of reheater by be pressed into steam pipe road and connect with the air intake of intermediate pressure cylinder, in be pressed into steam pipe road and be provided with middle pressure
Inlet valve group；It is provided with high pressure exhaust steam pressure measuring point at the steam drain of high pressure cylinder, extraction line is provided with after extraction control valve and takes out
Steam pressure measuring point, in be pressed on steam pipe road in be pressed into steam valve group before be provided with in be pressed into steam pressure measuring point；Extraction control valve, middle pressure
Inlet valve group, high pressure exhaust steam pressure measuring point, extraction pressure measuring point and in be pressed into steam pressure measuring point and be all connected with control system.
Preferably, also include that middle pressure drum and middle pressure superheater, middle pressure drum, middle pressure superheater and reheater connect successively
Connecing, the connection pipeline between middle pressure superheater and reheater is provided with pressure retaining valve, pressure retaining valve is connected with control system.
Compared with prior art, the present invention has the most progressive: at the steam drain of high pressure cylinder, draw gas on extraction line
Regulation valve after and in be pressed on steam pipe road in be pressed into steam valve group before be respectively provided with pressure-measuring-point, by control system according to pressure of drawing gas
Power setting value, in be pressed into actual pressure value that at steam pressure setting value and three, pressure-measuring-point records respectively to extraction control valve and
In be pressed into the aperture of steam valve group and be adjusted, realize adjustable steam extraction, finally by one of them or both cooperate
Make the actual pressure value at extraction pressure measuring point equal with extraction pressure setting value, i.e. with the demand vapour pressure force value phase of heat supply network
Deng, thus meet the heat demand of heat supply network.Unit internal efficiency can be effectively improved, reduce high-quality energy waste.
Accompanying drawing explanation
Fig. 1 is the structural representation of the combined cycle thermoelectric co-feeding system of the embodiment of the present invention.
Fig. 2 is the control principle drawing of the extraction regulation valve opening regulation of the embodiment of the present invention.
Fig. 3 embodiment of the present invention is pressed into the control principle drawing of steam valve group aperture regulation.
Fig. 4 is the control principle drawing of the pressure retaining valve aperture regulation of the embodiment of the present invention.
In figure:
1, reheater 2, middle pressure superheater 3, middle pressure drum
4, steam valve group 5, extraction control valve 6, pressure retaining valve it are pressed in
7, heat supply network HP, high pressure cylinder IP, intermediate pressure cylinder
P1, high pressure exhaust steam pressure measuring point P2, extraction pressure measuring point P3, in be pressed into steam pressure measuring point
100, high-pressure exhaust pipe road 200, in be pressed into steam pipe road 300, extraction line
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.These embodiments are only used for
The present invention is described, and not limitation of the present invention.
In describing the invention, it should be noted that term " " center ", " longitudinally ", " laterally ", " on ", D score,
Orientation or the position relationship of the instruction such as "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description rather than instruction or dark
The device or the element that show indication must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that right
The restriction of the present invention.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relatively
Importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can
To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
As it is shown in figure 1, a kind of combined cycle thermoelectric co-feeding system that the embodiment of the present invention provides.Combining of the present embodiment follows
Ring thermoelectricity even includes waste heat boiler, high pressure cylinder HP, intermediate pressure cylinder IP, low pressure (LP) cylinder (not shown) and control system for system,
Waste heat boiler includes high-pressure system, medium voltage network and low-pressure system.The smoke evacuation of gas turbine is entered by gas turbine smoke-exhaust pipeline
Enter waste heat boiler, make high-pressure system, medium voltage network and low-pressure system produce three strands of steam respectively: high steam, middle pressure steam and
Low-pressure steam, is injected separately in high pressure cylinder HP, intermediate pressure cylinder IP, low pressure (LP) cylinder.
Wherein, medium voltage network includes reheater 1, middle pressure superheater 2 and middle pressure drum 3, middle pressure drum 3, middle pressure superheater 2
Being sequentially connected with reheater 1, the steam drain of high pressure cylinder HP is connected with the entrance of reheater 1 by high-pressure exhaust pipe road 100, high pressure
High row's steam (the coldest reheated steam) that the steam drain of cylinder HP is discharged is carried out in high-pressure exhaust pipe road 100 is passed through reheater 1 again
Heating.The outlet of reheater 1 by be pressed into steam pipe road 200 and connect with the air intake of intermediate pressure cylinder IP, the heat of generation in reheater 1
Reheated steam warp is pressed into steam pipe road 200 and is passed through intermediate pressure cylinder IP.The air intake of intermediate pressure cylinder IP is pressed in being provided with steam valve group
4, in be pressed into steam valve group 4 and include pressing in one stop valve and a reheat control valve, for control and regulate reheat heat steam enter vapour
Amount.High-pressure exhaust pipe road 100 is provided with the extraction line 300 towards heat supply network 7, for extracting in high-pressure exhaust pipe road 100
Part high row steam, and high row's steam of extraction is passed through in heat supply network 7 thinks heat supply network 7 heat supply.Extraction line 300 is provided with and takes out
Steam control valve 5, for controlling and regulate the high flow arranging steam of extraction line 300 extraction.By extraction control valve 5 and in be pressed into
Cooperating of steam valve group 4, can adjust with the high row's steam flow distribution in high-pressure exhaust pipe road 100 extraction line 300
Joint and control, it is achieved adjustable steam extraction.Extraction control valve 5 and in be pressed into steam valve group 4 and be all connected with control system, by control system
To extraction control valve 5 and in be pressed into the aperture size of steam valve group 4 and be adjusted, thus realize automatically controlling of adjustable steam extraction.
In the present embodiment, as it is shown in figure 1, arrange high pressure exhaust steam pressure measuring point P1 at the steam drain of high pressure cylinder HP, high
Pressure steam pressure measuring point P1 is connected with control system, for measuring the actual high-voltage exhaust steam pressure value at high pressure cylinder HP steam drain,
And this actual high-voltage exhaust steam pressure value signal is sent to control system.
Extraction line 300 arranges extraction pressure measuring point P2, after extraction pressure measuring point P2 is positioned at extraction control valve 5, takes out
Steam pressure measuring point P2 is connected with control system, in measurement extraction line 300 under operating mode of drawing gas after extraction control valve 5
The actual pressure value of steam, is the actual pressure value of the steam sending into heat supply network 7, and this actual pressure value signal is sent to control
System processed.Be may determine that the extraction pressure setting value corresponding with extraction pressure measuring point P2 by the heat demand of heat supply network 7, control system
System can send open to extraction control valve 5 according to the actual pressure value recorded at this extraction pressure setting value and extraction pressure measuring point P2
Degree regulation signal, extraction control valve 5 receives and responds to this aperture regulation Signal Regulation aperture, makes to survey at extraction pressure measuring point P2
The actual pressure value obtained is equal with extraction pressure setting value.
Be pressed in arranging on steam pipe road 200 and be pressed into steam pressure measuring point P3, in be pressed into steam pressure measuring point P3 and be positioned at middle pressure
Before inlet valve group 4, in be pressed into steam pressure measuring point P3 and be connected with control system, be pressed in being pressed in feed channel 200 in measuring
The actual pressure value of the steam before steam valve group 4, and this actual pressure value signal is sent to control system.Steam valve it is pressed in due to
It is pressed into vapour pressure force value in needed for before group 4 and becomes corresponding relation with the actual high-voltage exhaust steam pressure value of high pressure cylinder HP, therefore drawing gas
Under operating mode, high pressure steam discharge measuring point P1 the actual pressure value recorded determine with in be pressed into steam pressure measuring point P3 relative to middle pressure
Initial steam pressure setting value.Control system can according to this is pressed into steam pressure setting value and in be pressed into and record at steam pressure measuring point P3
Actual pressure value in be pressed into steam valve group 4 send aperture regulation signal, in be pressed into steam valve group 4 receive and respond to this aperture regulation
Signal Regulation aperture, be pressed in making the actual pressure value that records at steam pressure measuring point P3 with in be pressed into steam pressure setting value equal.
Preferably, high pressure exhaust steam pressure measuring point P1, the extraction pressure measuring point P2 in the present embodiment and in be pressed into steam pressure survey
Point P3 is respectively equipped with three, and its result recorded all is sent to control system, control system use the method for " two from three " to enter
Row filter, thus can increase accuracy and the reliability of actual measured results.
Further, the present embodiment connection pipeline between middle pressure superheater 2 and reheater 1 is provided with pressure retaining valve 6, pressurize
Valve 6 is connected with control system, control system be adjusted the aperture of pressure retaining valve 6.
As shown in Figures 1 to 4, the embodiment of the present invention additionally provides the high row of a kind of combined cycle thermoelectric co-feeding system and draws gas
Control method, for realizing automatically controlling of the above-mentioned combined cycle thermoelectric co-feeding system adjustable steam extraction of the present embodiment.This reality
Execute the high row of example draw gas control method can by control system respectively to extraction control valve 5 and in be pressed into the aperture of steam valve group 4 and enter
Row regulation, realizes adjustable steam extraction by one of them or both cooperate, finally makes at extraction pressure measuring point P2
Actual pressure value equal with extraction pressure setting value, i.e. equal with the demand vapour pressure force value of heat supply network 7, thus meet heat supply network 7
Heat demand.
In operating mode of drawing gas, extraction flow can be increased by the aperture increasing extraction control valve 5, in the process,
Actual high-voltage exhaust steam pressure value at high pressure cylinder HP steam drain will decline.In order to avoid the reality at high pressure cylinder HP steam drain
High pressure exhaust steam pressure value is decreased below the scope of high pressure cylinder HP pressure ratio protection curve, sets high pressure steam discharge pressure in the present embodiment
Power minimum, this high pressure exhaust steam pressure minimum is that the actual high-voltage exhaust steam pressure value at high pressure cylinder HP steam drain disclosure satisfy that height
The minima of cylinder pressure HP pressure ratio protection curve.If drawing gas, operating mode occurs under the actual pressure value recorded at high pressure steam discharge measuring point P1
It is down to high pressure exhaust steam pressure minimum, and the actual pressure value recorded at extraction pressure measuring point P2 is still not up to extraction pressure and sets
The situation of value, is pressed into steam valve group 4 in can improving gas turbine load or progressively closing off, to continue to increase extraction pressure measuring point P2
The actual pressure at place, makes the actual high-voltage exhaust steam pressure value at high pressure cylinder HP steam drain be not less than high pressure exhaust steam pressure minimum simultaneously
Value, so that also being able to meet the demand of drawing gas of heat supply network 7 while steam-turbine unit is properly functioning.
In operating mode of drawing gas, it is also possible to increase extraction flow, in this process by the aperture being pressed into steam valve group 4 in reducing
In, in be pressed into steam valve group 4 before initial steam pressure be gradually reduced.In order to ensure unit safety, in be pressed into steam valve group 4 before enter vapour pressure
Power can not be too small, therefore sets in one in the present embodiment and is pressed into steam pressure protection value, and being pressed into steam pressure protection value in this can expire
The minimum through-current capacity of foot intermediate pressure cylinder IP.In be pressed at steam pressure measuring point P3 in be pressed into steam pressure setting value and can not press less than in this
Initial steam pressure protection value.Therefore, it is pressed in the middle of during the actual pressure value recorded at steam pressure measuring point P3 drops to and is pressed into steam pressure
During protection value, in be pressed into the aperture of steam valve group 4 and be the Minimal Protective aperture drawn gas under operating mode and do not continue to reduce.
In actual application, under pure condensate operating mode, extraction control valve 5 cuts out, in be pressed into the steam valve group 4 work according to combined cycle
Condition is pressed practical situation and is opened, and the control of unit is with protected mode as conventional pure condensate unit, and the setting of extraction control valve 5 is also
Unit will not be caused energy loss, it is ensured that unit efficiency.
Entered when drawing gas operating mode by pure condensate operating mode, if the amount of drawing gas of heat supply network 7 demand is the least, only by extraction control valve 5 i.e.
Can realize heat supply network 2 extraction flow regulation, now in be pressed into steam valve group 4 normally-open and need not participate in extraction flow regulation.
Open extraction control valve 5, the control system actual pressure recorded according to extraction pressure setting value and extraction pressure measuring point P2
The aperture of extraction control valve 5 is adjusted by value, makes the aperture of extraction control valve 5 be gradually increased, until extraction pressure measuring point P2
The actual pressure value that place records is equal with extraction pressure setting value, to meet the demand of drawing gas of heat supply network 7.
If the amount of drawing gas of heat supply network 7 demand is relatively big, the extraction flow tune of heat supply network 7 only can not be met by extraction control valve 5
Joint, now can be pressed into steam valve group 4 and participate in extraction flow regulation in making, by extraction control valve 5 and in be pressed into the mutual of steam valve group 4
Coordinate, it is achieved adjustable steam extraction.Preferably, in the present embodiment, when operating mode is drawn gas in entrance, first by high pressure steam discharge measuring point P1
The actual pressure value recorded is pressed into steam pressure setting value in being pressed in determining at steam pressure measuring point P3, and by control system according to
In be pressed into steam pressure setting value and in be pressed into the actual pressure value that records at steam pressure measuring point P3 in be pressed into steam valve group 4 and send out
Degree regulation signal, in be pressed into steam valve group 4 receive and respond to this aperture regulation Signal Regulation aperture, be pressed into steam pressure measuring point in making
The actual pressure value recorded at P3 with in be pressed into steam pressure setting value keep consistent.Then determined by the heat demand of heat supply network 7 and take out
Extraction pressure setting value at steam pressure measuring point P2, opens extraction control valve 5, and by control system according to extraction pressure setting value
And the actual pressure value recorded at extraction pressure measuring point P2 sends aperture regulation signal to extraction control valve 5, extraction control valve 5 connects
Receive and regulate Signal Regulation aperture in response to this aperture, to control extraction flow.During the control of extraction flow, first pass through
Increase the aperture of extraction control valve 5, improve the actual pressure at extraction pressure measuring point P2, increase extraction flow.If extraction regulation
After the aperture of the aperture of valve 5 increases to maximum opening, the actual pressure value recorded at extraction pressure measuring point P2 is the most not up to drawn gas
Pressure set points, can increase the actual pressure at extraction pressure measuring point P2 by a kind of continuation the in the following two kinds method.
One is: first improve gas turbine load, to continue to increase the actual pressure at extraction pressure measuring point P2.If combustion gas
Turbine load improves to peak load, and the actual pressure value recorded at extraction pressure measuring point P2 is still not up to extraction pressure and sets
Value, then continue to increase the actual pressure at extraction pressure measuring point P2 by the aperture being pressed into steam valve group 4 in reducing.Now need root
It is pressed into steam pressure in being pressed at steam pressure measuring point P3 in again determining according to the actual pressure value recorded at high pressure steam discharge measuring point P1
Setting value, and by control system according in be pressed into actual pressure value that steam pressure measuring point P3 records in be pressed into steam valve group 4
Go out aperture regulation signal, in be pressed into steam valve group 4 receive and respond to this aperture regulation Signal Regulation aperture so that in be pressed into vapour pressure
The actual pressure value recorded at power measuring point P3 with again determine in be pressed into steam pressure setting value keep consistent.In the process,
In be pressed into the aperture of steam valve group 4 and be gradually reduced, the actual pressure at extraction pressure measuring point P2 is gradually increased, until extraction pressure is surveyed
The actual pressure value recorded at some P2 reaches extraction pressure setting value.When the demand of drawing gas of heat supply network 7 reduces, then in can increasing
It is pressed into the aperture of steam valve group 4 to reduce the actual pressure at extraction pressure measuring point P2.
Another kind is: first passes through and is pressed into the aperture of steam valve group 4 in reduction and continues to increase the reality at extraction pressure measuring point P2
Border pressure, is pressed into the middle pressure at steam pressure measuring point P3 in again determining according to the actual pressure value recorded at high pressure steam discharge measuring point P1
Initial steam pressure setting value, and by control system according in be pressed into actual pressure value that steam pressure measuring point P3 records in be pressed into vapour
Valve group 4 send aperture regulation signal, in be pressed into steam valve group 4 receive and respond to this aperture regulation Signal Regulation aperture so that in
It is pressed into steam pressure setting value in being pressed into the actual pressure value that records at steam pressure measuring point P3 and again determining and keeps consistent.At this
During, in be pressed into the aperture of steam valve group 4 and be gradually reduced, the actual pressure at extraction pressure measuring point P2 is gradually increased.Central pressure
When the actual pressure value recorded at initial steam pressure measuring point P3 is pressed into steam pressure protection value in dropping to, in be pressed into opening of steam valve group 4
Degree can not be further continued for for Minimal Protective aperture reducing.If the actual pressure value now recorded at extraction pressure measuring point P2 reaches not yet
To extraction pressure setting value, then continue to increase the actual pressure at extraction pressure measuring point P2 by improving gas turbine load,
Until the actual pressure value recorded at extraction pressure measuring point P2 reaches extraction pressure setting value.Same, when drawing gas of heat supply network 7 needs
The amount of asking reduce time, it is possible to increase in be pressed into the aperture of steam valve group 4 to reduce the actual pressure at extraction pressure measuring point P2.
In the present embodiment, after extraction pressure measuring point P2 is arranged on extraction control valve 5, pipe volume is little, faster system response,
Therefore the aperture regulation adoption rate integral adjustment of extraction control valve 5, its control principle is as shown in Figure 2.Heat supply according to heat supply network 7
Demand determines extraction pressure setting value, using this extraction pressure setting value as setting that proportional-integral derivative controller PID inputs
Definite value, chooses two measured values as proportional-integral derivative controller PID input from three extraction pressure measuring point P2.When
When having a fault in three extraction pressure measuring point P2, control system sends warning；When three extraction pressure measuring point P2 have two
During individual or three faults, control system sends the protection act signal that draws gas, and extraction control valve 5 receives and responds to this protection of drawing gas
Actuating signal is closed, and excises action of drawing gas.When extraction regulation puts into, the output of proportional-integral derivative controller PID is multiplied by
Value after Proportional coefficient K sends to extraction control valve 5 as the aperture regulation signal of extraction control valve 5, and extraction control valve 5 receives
And regulate Signal Regulation aperture in response to this aperture；When the protection act that draws gas, excise draw gas action, shutdown or overspeed protection action
When one of which or several generation, proportional-integral derivative controller PID output constant value 0 is as the aperture of extraction control valve 5
Regulation signal sends to extraction control valve 5, and extraction control valve 5 receives and responds to this aperture regulation signal at stop.
In be pressed into steam valve group 4 then need consider waste heat boiler pipe volume, measuring point low-response, therefore in be pressed into steam valve group 4
Aperture regulation adoption rate droop control, steam valve group 4 can be pressed in preventing and fluctuate back and forth, it is to avoid cause in waste heat boiler pressure vapour
Wrap the variation of 3 water-level fluctuations or steam turbine load.In be pressed into steam valve group 4 aperture regulation control principle as shown in Figure 3.In work of drawing gas
During condition, in being pressed at steam pressure measuring point P3 in determining according to the actual pressure value recorded at high pressure steam discharge measuring point P1, it is pressed into vapour pressure
Power setting value, in be pressed into during steam pressure setting value is not less than and be pressed into steam pressure protection value.When operating mode of drawing gas does not puts into, in be pressed into
Steam pressure setting value derives from operations staff and manually sets or boiler coordination system (CCS).It is pressed into steam pressure setting value in to make
For the setting value of proportional controller SUB input, it is pressed into from three in steam pressure measuring point P3 and chooses two as proportional controller
The measured value of SUB input.When three are pressed into steam pressure measuring point P3 has a fault time, control system sends warning；When three
Being pressed into when having two or three faults in steam pressure measuring point P3 in individual, control system sends the protection act signal that draws gas, and draw gas tune
Joint valve 5 receives and responds to this protection act signal at stop that draws gas.When operating mode of drawing gas puts into and does not occurs to shut down or overspeed protection
During action, the output of proportional controller SUB be multiplied by Proportional coefficient K after value as in be pressed into steam valve group 4 aperture regulation signal
Send in be pressed into steam valve group 4, in be pressed into steam valve group 4 receive and respond to this aperture regulation Signal Regulation aperture；When stopping
When machine or overspeed protection action, proportional controller SUB output constant value 0 as in be pressed into steam valve group 4 aperture regulation signal send out
Be pressed into steam valve group 4 in delivering to, in be pressed into steam valve group 4 receive and respond to this aperture regulation signal at stop.
Further, the present embodiment is provided with pressure retaining valve 6 on the connection pipeline between middle pressure superheater 2 and reheater 1, controls
System can according in press the higher value in the control variable of the control variable of drum 3 pressure change rate and middle pressure drum 3 force value
The aperture of pressure retaining valve 6 is adjusted.Preferably, can regulate using the valve position signal of extraction control valve 5 as pressure retaining valve 6 aperture
Feed-forward signal.By arranging pressure retaining valve 6 and by control system, the aperture of pressure retaining valve 6 being controlled regulation, can slow down and take out
The impact that vapour amount is widely varied greatly the centering pressure pressure of drum 3 and water level causes, prevents middle pressure drum 3 from producing bigger pressure
And water-level fluctuation.
As shown in Figure 4, the present embodiment uses scattered control system (DCS) to pressurize to pressure retaining valve 6 aperture regulation control principle
The aperture regulation of valve 6 is controlled.When Unit Commitment stage or operating mode of drawing gas do not put into, pressure retaining valve 6 standard-sized sheet, now it is not required to
The aperture of pressure retaining valve 6 is controlled.In operating mode of drawing gas, if the amount of drawing gas changes, need the aperture of pressure retaining valve 6 is carried out
Control.Simultaneously using middle pressure drum 3 pressure change rate and middle pressure drum 3 force value as control object, make with waste heat boiler load
For the compensation signal of middle pressure drum 3 force value, using the valve position signal of extraction control valve 5 as feed-forward signal, it is thus achieved that middle pressure drum 3
The control variable of pressure change rate and the control variable of middle pressure drum 3 force value, take the higher value in both as pressure retaining valve 6
Aperture regulation signal sends to pressure retaining valve 6, and pressure retaining valve 6 receives and responds to this aperture regulation Signal Regulation aperture, makes middle pressure vapour
Wrap 3 pressure change rates and middle pressure drum 3 force value within set point.After the waste heat boiler blowing out setting time, control system
System sends blowing out and sets time actuating signal, and pressure retaining valve 6 receives and responds to this signal at stop.
In sum, combined cycle thermoelectric co-feeding system and the height thereof of the present embodiment arranges control method of drawing gas, at high pressure cylinder
At the steam drain of HP, on extraction line 300 after extraction control valve 5 and in be pressed on steam pipe road 200 in be pressed into before steam valve group 4 point
Pressure-measuring-point is not set, by control system according to extraction pressure setting value, in be pressed into steam pressure setting value and three pressure and survey
The actual pressure value that records of point respectively to extraction control valve 5 and in be pressed into the aperture of steam valve group 4 and be adjusted, by one of them
Or both cooperate realizes adjustable steam extraction, finally make the actual pressure value at extraction pressure measuring point P2 and pressure of drawing gas
Power setting value is equal, i.e. equal with the demand vapour pressure force value of heat supply network 7, thus meets the heat demand of heat supply network 7.Can effectively carry
High unit internal efficiency, minimizing high-quality energy waste.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and replacement, these improve and replace
Also should be regarded as protection scope of the present invention.
Claims (10)
1. the high of a combined cycle thermoelectric co-feeding system arranges control method of drawing gas, it is characterised in that the row of high pressure cylinder (HP)
High pressure exhaust steam pressure measuring point (P1) is set at steam ports, extraction pressure is set after the upper extraction control valve (5) of extraction line (300) and surveys
Point (P2), in be pressed into steam pipe road (200) upper in be pressed into that steam valve group (4) is front and arrange in be pressed into steam pressure measuring point (P3)；Drawing gas
Under operating mode, the heat demand of heat supply network (7) determine extraction pressure setting value, described high pressure steam discharge measuring point (P1) reality recorded
Border force value is pressed into steam pressure setting value in determining, control system is surveyed according to described extraction pressure setting value and described extraction pressure
The aperture of described extraction control valve (5) is adjusted and/or enters according to medium pressure by the actual pressure value that point (P2) place records
The actual pressure value that steam pressure setting value and medium pressure initial steam pressure measuring point (P3) place record is to medium pressure inlet valve group (4)
Aperture be adjusted, make the actual pressure value at described extraction pressure measuring point (P2) place reach described extraction pressure setting value.
The high of combined cycle thermoelectric co-feeding system the most according to claim 1 arranges control method of drawing gas, it is characterised in that set
Being pressed into steam pressure protection value in Ding, medium pressure initial steam pressure setting value is not less than medium pressure initial steam pressure protection value；Work as institute
Be pressed into the actual pressure value that steam pressure measuring point (P3) place records in stating when dropping to medium pressure initial steam pressure protection value, described in
The aperture being pressed into steam valve group (4) is the Minimal Protective aperture under operating mode of drawing gas, and does not continues to reduce.
The high of combined cycle thermoelectric co-feeding system the most according to claim 2 arranges control method of drawing gas, it is characterised in that enter
After entering operating mode of drawing gas, first increasing the aperture of described extraction control valve (5), the aperture at described extraction control valve (5) increases to
After big aperture, first improve gas turbine load, then reduction medium pressure enters vapour after gas turbine load raising to peak load
The aperture of valve group (4), until the actual pressure value that described extraction pressure measuring point (P2) place records reaches described extraction pressure and sets
Value.
The high of combined cycle thermoelectric co-feeding system the most according to claim 2 arranges control method of drawing gas, it is characterised in that enter
After entering operating mode of drawing gas, first increasing the aperture of described extraction control valve (5), the aperture at described extraction control valve (5) increases to
After big aperture, first reduce the aperture of medium pressure inlet valve group (4), then be decreased in the aperture of medium pressure inlet valve group (4)
Gas turbine load is improved after described Minimal Protective aperture, until the actual pressure value that described extraction pressure measuring point (P2) place records
Reach described extraction pressure setting value.
The high of combined cycle thermoelectric co-feeding system the most according to claim 1 arranges control method of drawing gas, it is characterised in that set
Determining high pressure exhaust steam pressure minimum, the actual pressure value recorded when described high pressure steam discharge measuring point (P1) place drops to described high pressure
When the actual pressure value at steam pressure minimum and described extraction pressure measuring point (P2) place is not up to described extraction pressure setting value, carry
High gas turbine load or be pressed into steam valve group in progressively closing off.
The high of combined cycle thermoelectric co-feeding system the most according to claim 1 arranges control method of drawing gas, it is characterised in that institute
State high pressure exhaust steam pressure measuring point (P1), described extraction pressure measuring point (P2) and medium pressure initial steam pressure measuring point (P3) to be respectively equipped with
Three.
The high of combined cycle thermoelectric co-feeding system the most according to claim 1 arranges control method of drawing gas, it is characterised in that control
System processed regulates adoption rate integral adjustment to the aperture of described extraction control valve (5), and control system is to medium pressure inlet valve
The aperture regulation adoption rate droop control of group (4).
The high of combined cycle thermoelectric co-feeding system the most according to claim 1 arranges control method of drawing gas, it is characterised in that
Connection pipeline between middle pressure superheater (2) and reheater (1) is provided with pressure retaining valve (6), control system according in press drum (3)
Higher value in the control variable of pressure change rate and the control variable of middle pressure drum (3) force value is to described pressure retaining valve (6)
Aperture is adjusted, the feedforward letter regulated as described pressure retaining valve (6) aperture using the valve position signal of described extraction control valve (5)
Number.
9. a combined cycle thermoelectric co-feeding system, it is characterised in that include high pressure cylinder (HP), intermediate pressure cylinder (IP), low pressure (LP) cylinder, again
Hot device (1) and control system, the steam drain of described high pressure cylinder (HP) is by high-pressure exhaust pipe road (100) and described reheater (1)
Entrance connection, described high-pressure exhaust pipe road (100) is provided with the extraction line (300) towards heat supply network (7), described extraction steam pipe
Road (300) is provided with extraction control valve (5)；The outlet of described reheater (1) by be pressed into steam pipe road (200) and medium pressure
The air intake connection of cylinder (IP), medium pressure steam inlet pipe road (200) is pressed into steam valve group (4) in being provided with；Described high pressure cylinder (HP)
Steam drain at be provided with high pressure exhaust steam pressure measuring point (P1), described extraction line (300) sets after described extraction control valve (5)
Have extraction pressure measuring point (P2), on medium pressure steam inlet pipe road (200) in be pressed into that steam valve group (4) is front and be provided with in be pressed into steam pressure
Measuring point (P3)；Described extraction control valve (5), medium pressure inlet valve group (4), described high pressure exhaust steam pressure measuring point (P1), described
Extraction pressure measuring point (P2) and medium pressure initial steam pressure measuring point (P3) are all connected with described control system.
Combined cycle thermoelectric co-feeding system the most according to claim 9, it is characterised in that also include middle pressure drum (3) and
Middle pressure superheater (2), medium pressure drum (3), middle pressure superheater (2) and described reheater (1) are sequentially connected with, in medium pressure
Connection pipeline between superheater (2) and described reheater (1) is provided with pressure retaining valve (6), described pressure retaining valve (6) and described control
System connects.
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