CN108104887A - The therrmodynamic system of double reheat - Google Patents
The therrmodynamic system of double reheat Download PDFInfo
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- CN108104887A CN108104887A CN201711288319.9A CN201711288319A CN108104887A CN 108104887 A CN108104887 A CN 108104887A CN 201711288319 A CN201711288319 A CN 201711288319A CN 108104887 A CN108104887 A CN 108104887A
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- turbine
- pressure
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- steam
- combination drive
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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- 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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- 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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
Abstract
The present invention relates to thermal power generation fields, disclose a kind of therrmodynamic system of double reheat, which includes steam turbine, condenser, bypass turbine, combination drive turbine and high-pressure heater；The steam turbine includes ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder；The steam drain of the ultra-high pressure cylinder is connected respectively with the combination drive turbine and the high-pressure heater, and extraction opening is provided on the combination drive turbine, and the extraction opening is connected with the high-pressure heater；The steam drain of medium pressure cylinder is connected respectively with the low pressure (LP) cylinder and the bypass turbine, and the steam drain of the bypass turbine is connected with the condenser.The therrmodynamic system greatly improves the economy of generating set by the cascade utilization of energy；Meanwhile ensure to work in condition range of the high, medium and low cylinder pressure of host all in greater efficiency in generating set load variations, station service power consumption rate is reduced, improves the overall work performance of double reheat.
Description
Technical field
The present invention relates to thermal power generation fields, and in particular to a kind of therrmodynamic system of double reheat.
Background technology
Resuperheat refers to that the reheater for by the steam after steam turbine high-pressure cylinder expansion working, being sent into boiler add again
Heat makes its temperature reach or close to main steam temperature, then send back to again in steam turbine, low pressure (LP) cylinder continues expansion working.Reheating
Technology can increase the acting enthalpy drop of steam, steam expansion end of a period humidity be reduced, so as to improve the acting ability of steam and unit
Generating efficiency.Resuperheat can be divided into single reheat and double reheat, under identical steam pressure temperature parameter, double reheat
2% is improved compared to single reheat generatine set heat efficiency, corresponding CO2Emission reduction about 3.6%.Foreign countries have more ultra supercritical double reheats
The operational performance of unit, the representative are the Chuan Yue power plant of Japan and the Nordjylland power plant of Denmark, demonstrate secondary
The Technical Economy and reliability of thermal technology again.However, after using double reheat, since steam superheat greatly improves, cause
The excessive temperature differentials that regenerative steam feeds water with corresponding regenerator causes substantial amounts of available energy loss.It can using externally arranged steam cooler
Heat transfer temperature difference is reduced, but is acted on very limited.For this purpose, relevant enterprise and research team are all attempting various solution party both at home and abroad
The electrical BESD turbines scheme of case, wherein Shanghai has certain application prospect in theory.The turbine scheme is from ultra-high pressure cylinder
A part of steam is distributed in steam discharge, it is extra for driving feed pump into the BESD turbine expansions acting of a special designing
Power be incorporated to station service.Oxygen-eliminating device and part height add, low plus directly from the steam extraction of BESD turbines or using BESD turbines steam discharge；
Since the steam in BESD turbines does not pass through reheating, the steam extraction degree of superheat problem of double reheat power generation sets is avoided.The program
Greatest problem is the application of BESD turbine power generation amounts, and since the turbine runs for fixed frequency, efficiency is very low under variable working condition, and by its
Big-power transducer is also needed to during the electric energy water supply pump driving of generation, not only equipment investment is big, but also causes further
Energy loss.Further, since under variable working condition the pressure of oxygen-eliminating device exhaust point cannot keep it is constant, it is also necessary to met by throttling
The requirement of oxygen-eliminating device, available energy loss are also very big.
In addition to the above problem, when large steam turbine is run under high load capacity operating mode, also there are the expansions of low pressure (LP) cylinder final stage
The problem of insufficient, seriously affects the economy of unit.This is because being limited by blade material intensity, steam turbine last stage is through-flow face
Product is extremely difficult to optimum value during high load capacity, and low pressure (LP) cylinder efficiency is caused to be reduced with the increase of load, and limits the steam discharge back of the body
The further reduction of pressure.Final stage flow area deficiency can be solved the problems, such as by increasing a set of low pressure (LP) cylinder, but not only cost is excessively high, but also
Rotor axial system is excessively complicated will also to cause functional reliability to decline.However, with the increase of load, high, intermediate pressure cylinder efficiency is not
It is disconnected to improve, it is exactly the opposite with the variation tendency of low pressure (LP) cylinder.
Therefore, very it is necessary to find a kind of therrmodynamic system of efficient double reheat at present.
The content of the invention
The purpose of the invention is to overcome drawbacks described above existing in the prior art, a kind of heating power system of double reheat is provided
System, the therrmodynamic system greatly improve the economy of generating set by the cascade utilization of energy；Meanwhile in generating set load
Ensure that the high, medium and low cylinder pressure of host all in working in the condition range of greater efficiency, reduces station service power consumption rate, improves two during variation
The overall work performance of secondary reheating.
To achieve these goals, the present invention provides a kind of therrmodynamic system of double reheat, which includes vapour
Turbine, condenser, bypass turbine, combination drive turbine and high-pressure heater；The steam turbine include ultra-high pressure cylinder, high pressure cylinder,
Intermediate pressure cylinder and low pressure (LP) cylinder；The steam drain of the ultra-high pressure cylinder connects respectively with the combination drive turbine and the high-pressure heater
It connects, extraction opening is provided on the combination drive turbine, the extraction opening is connected with the high-pressure heater；Medium pressure cylinder
Steam drain is connected respectively with the low pressure (LP) cylinder and the bypass turbine, and the steam drain of the bypass turbine connects with the condenser
It connects.
By the above-mentioned technical proposal of the present invention, following advantageous effect can be obtained：
(1) by controlling the steam extraction amount of bypass turbine that the high, medium and low cylinder pressure of host is made to run on high efficient district, steam turbine is improved
The energy conversion efficiency of host；
(2) bypass turbine, which is separately provided auxiliary condenser, can reduce the back pressure of main condenser, improve host (steam turbine)
Acting ability improves unit cycle efficieny；
(3) bypass the mating auxiliary generator power generation of turbine and be incorporated to station service electrical system, reduce station service power consumption rate；
(4) bypass turbine possesses frequency modulation function, and the power of host is quickly adjusted by adjusting the throttle flow of bypass turbine, from
And possesses the function of fast frequency hopping；
(5) steam discharge of combination drive turbine returns to heat regenerative system, and is introduced into condenser, is effectively utilized this some vapor
The latent heat of vaporization, reduce cold source energy；
(6) combination drive Turbine section regenerative steam is reduced without reheating, the degree of superheat, and loss reduces, and after reheating
Steam is mainly used for big machine acting, and Btu utilization is more effective；
(7) degree of superheat of combination drive Turbine section steam extraction is reduced, and reduces related extraction line, valve, heater
Material rate has saved the manufacture cost of pipeline, valve and equipment；
(8) combination drive turbine design point is chosen at sub-load (be usually 70-85%THA operating modes), i.e., unit is most
The operating mode often run greatly improves the economy of the actual motion of unit；
(9) therrmodynamic system provided by the invention bypasses the method for operation of turbine, combination drive turbine by controlling, and makes steamer
The high, medium and low cylinder pressure of machine runs on high efficient district, and very big limit realizes the cascade utilization of unit energy, greatly improves generating set
Economy.
Description of the drawings
Fig. 1 is the schematic diagram of the therrmodynamic system of double reheat provided by the invention.
Reference sign
1 ultra-high pressure cylinder, 2 high pressure cylinder
3 intermediate pressure cylinder, 4 low pressure (LP) cylinder
5 main generator, 6 condenser
7 bypass 8 auxiliary generators of turbine
9 combination drive turbine, 10 frequency conversion engine
11 feed pump, 12 high-pressure heater
13 oxygen-eliminating device, 121 No.1 high-pressure heater
122 No. two high-pressure heaters, 123 No. three high-pressure heaters
The air intake of 124 No. four high-pressure heater P1 ultra-high pressure cylinders
The steam drain of the steam drain P3 intermediate pressure cylinders of P2 ultra-high pressure cylinders
The air intake of the air intake P5 bypass turbines of P4 low pressure (LP) cylinders
The steam drain of the steam drain P7 bypass turbines of P6 low pressure (LP) cylinders
The condensation water out of the condensation water out P9 auxiliary condensers of the main condensers of P8
The first extraction openings of steam drain P11 of P10 combination drive turbines
The 3rd extraction openings of the second extraction openings of P12 P13
S1 the first regulating valve the second regulating valves of S2
Specific embodiment
The endpoint of disclosed scope and any value are not limited to the accurate scope or value herein, these scopes or
Value should be understood to comprising the value close to these scopes or value.For numberical range, between the endpoint value of each scope, respectively
It between the endpoint value of a scope and individual point value and can be individually combined with each other between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
As shown in Figure 1, the present invention provides a kind of therrmodynamic system of double reheat, which includes steam turbine, coagulates
Vapour device 6, bypass turbine 7, combination drive turbine 9 and high-pressure heater 12；The steam turbine include ultra-high pressure cylinder 1, high pressure cylinder 2,
Intermediate pressure cylinder 3 and low pressure (LP) cylinder 4；The steam drain P2 of the ultra-high pressure cylinder 1 respectively with the combination drive turbine 9 and the hyperbaric heating
Device 12 connects, and extraction opening is provided on the combination drive turbine 9, and the extraction opening is connected with the high-pressure heater 12；Institute
The steam drain P3 for stating intermediate pressure cylinder 3 is connected respectively with the low pressure (LP) cylinder 4 and the bypass turbine 7, the steam drain of the bypass turbine 7
P7 is connected with the condenser 6.
In the present invention, the therrmodynamic system further includes boiler and main generator 5, the boiler, the steam turbine and institute
It states main generator 5 to be sequentially connected, it is preferable that the boiler is connected with the ultra-high pressure cylinder 1, the power output of the low pressure (LP) cylinder 4
To the main generator 5.
In the present invention, according to the difference of internal pressure grade and the sequencing into vapour, the steam turbine is included successively
Ultra-high pressure cylinder 1, high pressure cylinder 2, intermediate pressure cylinder 3 and the low pressure (LP) cylinder 4 of connection；Preferably, the ultra-high pressure cylinder 1, the high pressure cylinder 2, institute
It states intermediate pressure cylinder 3 and the low pressure (LP) cylinder 4 passes sequentially through uniaxial connection.
According to the present invention, the condensation water of the condensation water out discharge of the condenser 6 passes through feed pump after oxygen-eliminating device 13
11 are transported to the high-pressure heater 12, it is preferable that the condensation water out of the condenser 6 passes through pipeline and the oxygen-eliminating device
13 connections, the condensation water are transported to the oxygen-eliminating device 13 by pipeline, are then transported to the height by feed pump 11
Press heater 12.
According to the present invention, the steam drain P10 of the combination drive turbine 9 is connected with the oxygen-eliminating device 13；Preferably, it is described
The steam exhaust that combination drive turbine 9 generates in the process of running is transported to the oxygen-eliminating device through the steam drain P10 by pipeline
In 13.
In the present invention, the pressure of the steam drain P10 of the combination drive turbine 9 is more than or equal to the pressure of the oxygen-eliminating device 13
Power；Preferably, the pressure of the steam drain P10 of the combination drive turbine 9 does not change with operating mode.
According to the present invention, the power that the combination drive turbine 9 exports can be used to energize for the feed pump 11.It is excellent
Selection of land, the power that the combination drive turbine 9 exports are less than or equal to the power of the feed pump 11；It is highly preferred that the mixing
Driving turbine 9 is connected with adjustable frequency motor 10, to be that the feed pump 11 energizes jointly.It is further preferred that the combined drive
The power that dynamic turbine 9 exports is less than the power of the feed pump 11, in operation the underpower part of the feed pump 11 by
The adjustable frequency motor 10 drives.
According to the present invention, the therrmodynamic system includes at least one high-pressure heater 12, preferably includes 4-6 hyperbaric heating
Device 12, and each high-pressure heater 12 is sequentially connected.Preferably, the pumping of the high-pressure heater 12 and the combination drive turbine 9
Steam ports connects.It is highly preferred that the extraction opening number on the combination drive turbine 9 is less than or equal to of the high-pressure heater 12
Number.It is preferably 4-6 extraction opening it is further preferred that being provided at least one extraction opening on the combination drive turbine 9.Again
It is further preferred that each extraction opening is corresponding with the high-pressure heater 12 respectively.
In a kind of preferred embodiment of the present invention, as shown in Figure 1, the therrmodynamic system is sequentially connected including 4
The high-pressure heater 12, be respectively the high-pressure heater of high-pressure heater 122, three of No.1 high-pressure heater 121, two
123 and No. four high-pressure heaters 124, No. four high-pressure heaters 124 are connected with the feed pump 11, and the condenser 6
The condensation water of generation is inputted to No. four high-pressure heaters 124 by feed pump 11, then passed sequentially through after 13 deoxygenation of oxygen-eliminating device
123, No. two high-pressure heaters 122 of No. three high-pressure heaters and No.1 high-pressure heater 121, the No.1 high-pressure heater 121
The feedwater of discharge is back to boiler recycling.It is highly preferred that setting 3 extraction openings on the combination drive turbine, respectively take out
Steam ports P11, extraction opening P12 and extraction opening P13, and they each add respectively with described 122, No. three high pressures of No. two high-pressure heaters
Hot device 123 and No. four high-pressure heaters 124 connect so that the steam of the combination drive turbine 9 by each extraction opening respectively by
The high-pressure heater being each connected is delivered to, to achieve the purpose that heat supply.It is further preferred that the No.1 high-pressure heater
121 are connected with the steam drain P2 of the ultra-high pressure cylinder 1, to carry out heat supply using the steam generated by the ultra-high pressure cylinder 1, especially
Ground, when the steam extraction amount deficiency of described 122, No. three high-pressure heaters 123 of No. two high-pressure heaters and No. four high-pressure heaters 124
When, it can be supplemented by No.1 high-pressure heater 121.
According to the present invention, the power output of the bypass turbine 7 is to auxiliary generator 8；Preferably, the auxiliary generator
8) it is connected with secondary distribution equipment and is used to power to the secondary distribution equipment；It is highly preferred that the secondary distribution equipment bag
It includes in adjustable frequency motor 10, condensate pump, wind turbine (including pressure fan, air-introduced machine, primary air fan etc.), vacuum pump and environmental protecting device
At least one.
According to the present invention, the condenser 6 preferably includes main condenser 61 and auxiliary condenser 62, the low pressure (LP) cylinder 4
Steam drain P6 is connected with the main condenser 61, and the steam drain of the bypass turbine 7 is connected with the auxiliary condenser 62.It is more excellent
Selection of land, the condensation water out P9 and identical condensation water of the condensation water out P8 of the main condenser 61 and the auxiliary condenser 62
Pipeline connects, and the condensing water conduit is connected with the oxygen-eliminating device 13.
According to the present invention, it is provided with the between the air intake P5 of the steam drain P3 of medium pressure cylinder 3 and the bypass turbine 7
One regulating valve S1, the first regulating valve S1 is used to adjust the initial steam pressure of the bypass turbine 7.
In a kind of preferred embodiment of the present invention, when the load variations of unit, pass through first regulating valve
The throttle flow of the S1 adjustment bypass turbine 7, to maintain the ultra-high pressure cylinder 1 of the steam turbine, high pressure cylinder 2, intermediate pressure cylinder 3 and low pressure
Cylinder 4 can work in higher efficiency range；In addition, by the first regulating valve S1 adjust the bypass turbine into vapour
Amount can also quickly adjust the power of the steam turbine, so as to possess the function of fast frequency hopping.
According to the present invention, set between the air intake of the steam drain P2 of the ultra-high pressure cylinder 1 and the combination drive turbine 9
There is the second regulating valve S2, the second regulating valve S2 to be used to adjust the initial steam pressure of the combination drive turbine 9.
In a kind of preferred embodiment of the present invention, when the load of unit is reduced, the combination drive turbine 9
Initial steam pressure, the power consumption of the feed pump 11 and rotating speed are all reduced with the decline of load, pressure drop, enthalpy drop and Ge Gao per level-one
The steam extraction amount of pressure heater 12 is also synchronously reduced with the reduction of rotating speed and overall presure drop, is only needed at this time to second regulating valve
S2 progress trace regulation can maintain the constant of the exhaust steam pressure of the combination drive turbine 9；Preferentially meet in operation to
The back pressure of the power consumption of water pump 11 and the combination drive turbine 9.
According to the present invention, the bypass turbine 7 is preferably pure condensate formula turbine；It is highly preferred that the combination drive turbine 9 is
Take out back of the body formula turbine.
The present invention also provides the control method of above-mentioned therrmodynamic system, which includes：
(1) under low load condition (for example, usually less than 70% rated load), by the first regulating valve S1 by institute
State bypass turbine close, with ensure the steam flow of the low pressure (LP) cylinder 4 under this operating mode and the steam flow under optimum condition compared with
It is close；The efficient routine of the combination drive turbine 9 is the corresponding feedwater pump power of annual operating mode of steam turbine, also,
In low- load conditions, can feed pump 11 be directly driven by the combination drive turbine 9, so as to reduce station-service electric current；
(2) under high-load condition (for example, usually above 75% rated load), by adjusting the first regulating valve S1
The throttle flow of the bypass turbine 7 is controlled, is in ultra-high pressure cylinder 1, high pressure cylinder 2, intermediate pressure cylinder 3 and the low pressure (LP) cylinder 4 of steam turbine
High efficient district；Also, start adjustable frequency motor 10, feedwater pump operation is driven jointly with the combination drive turbine 9, to be born in unit
The power that the combination drive turbine 9 is maintained in the variation of lotus operating mode is constant.
In the present invention, term " low load condition " is typically lower than 70% rated load, but can be according to various vapour
The optimal working point of turbine type is suitably adjusted.
In the present invention, term " high-load condition " is often referred to higher than 75% rated load, but can be according to various vapour
The optimal working point of turbine type is suitably adjusted.
Preferably, while throttle flow is adjusted, the power of steam turbine remains unchanged the bypass turbine 7, so as to indirectly
Change the throttle flow of the ultra-high pressure cylinder 1 of steam turbine, high pressure cylinder 2, intermediate pressure cylinder 3 and low pressure (LP) cylinder 4.For example, it is provided with reference to manufactory
Certain subcritical 600MW steam turbine performances characteristic curve, drawn by heat Balance Calculation：Under high load capacity operating mode, with bypass
The throttle flow of turbine 7 rises, and the throttle flow of high pressure cylinder 2 and intermediate pressure cylinder 3 is in rising trend, and the throttle flow of low pressure (LP) cylinder 4 becomes in decline
Gesture, the efficiency so as to cause the high pressure cylinder 2 of steam turbine rise, and the efficiency of intermediate pressure cylinder 3 is basically unchanged, and the efficiency of low pressure (LP) cylinder 4 rises,
Occur so as to effectively avoid the phenomenon that low pressure (LP) cylinder underexpansion is caused since flow is excessive.
The present invention will be described in detail by way of examples below.
Embodiment 1
The arrangement of the therrmodynamic system of double reheat provided by the invention is as shown in Figure 1.The therrmodynamic system mainly includes solidifying
9,4 vapour device 6 (preferably including main condenser 61 and auxiliary condenser 62), bypass turbine 7, combination drive turbine high-pressure heaters
(it is respectively the high-pressure heater 123 of high-pressure heater 122, three of No.1 high-pressure heater 121, two and No. four high-pressure heaters
124) and sequentially connected boiler, steam turbine are (including sequentially connected ultra-high pressure cylinder 1, high pressure cylinder 2, intermediate pressure cylinder 3 and low pressure (LP) cylinder
4) and main generator 5, wherein, the steam that boiler generates enters ultra-high pressure cylinder 1, low pressure (LP) cylinder 4 by the air intake P1 of ultra-high pressure cylinder 1
The power output of generation is powered to main generator 5 for each controller switching equipment (such as steam turbine), and the steam discharge of low pressure (LP) cylinder 4 passes through low
The steam drain P6 discharges of cylinder pressure, are then sent to main condenser 61, condensation water are formed, through pipeline to 13 deoxygenation of oxygen-eliminating device
Afterwards, No. four high-pressure heaters 124 are pumped into through feed pump 11, then pass sequentially through No. three, No. two and the heating of No.1 high-pressure heater
After be back to heat regenerative system.
Steam drain P3 discharge of the steam discharge of the intermediate pressure cylinder 3 of steam turbine through intermediate pressure cylinder, then respectively by low pressure (LP) cylinder into vapour
Mouth P4 enters low pressure (LP) cylinder 4 and the air intake P5 of bypass turbine enters bypass turbine 7, and the steam drain P7 and auxiliary for bypassing turbine 7 coagulate
Vapour device 6 connects, and aids in the condensation water that condenser 6 generates through the condensation water out P9 of condenser is aided in discharge, then with being coagulated by main
The condensation water of the condensation water out P8 discharges of vapour device inputs oxygen-eliminating device 13 jointly.Also, the power that bypass turbine 7 generates is output
To auxiliary generator 8, for the power supply (such as adjustable frequency motor 10) of each controller switching equipment.
The ultra-high pressure cylinder 1 of steam turbine also has part steam discharge to enter combination drive in addition into No.1 high-pressure heater 121
Turbine 9 is directly discharged into deoxygenation into 9 expansion work of combination drive turbine, steam exhaust after the second regulating valve S2 by steam drain P10
Device 13.Combination drive turbine 9 is provided with 3 non-adjustment extraction openings, is respectively No. two, No. three and No. four high-pressure heater steam supplies；
Also, combination drive turbine 9 directly drives feed pump 11, according to the performance of feed pump 11 variable speed is needed to run.Combination drive
The efficient routine of turbine 9 is host (steam turbine) annual operating mode corresponding feedwater pump power, also, combination drive turbine 9
Power is no more than the power consumption of feed pump under any operating mode, and underpower part is driven by adjustable frequency motor 10 in operation.
The exhaust steam pressure of combination drive turbine 9 is equal to or slightly higher than the pressure of oxygen-eliminating device 13, and does not change with operating mode.
Under high-load condition (being higher than 75% rated load), the bypass is controlled by adjusting the first regulating valve S1
The throttle flow of turbine 7 makes ultra-high pressure cylinder 1, high pressure cylinder 2, intermediate pressure cylinder 3 and the low pressure (LP) cylinder 4 of steam turbine be in high efficient district；Also,
Start adjustable frequency motor 10, feedwater pump operation is driven jointly with the combination drive turbine 9, in the variation of unit load operating mode
The power of the middle maintenance combination drive turbine 9 is constant.
Under low load condition (being less than 70% rated load), the bypass turbine is closed by the first regulating valve S1
It closes, to ensure that the steam flow of the low pressure (LP) cylinder 4 under this operating mode and the steam flow under optimum condition are closer to；It is described mixed
The efficient routine for closing driving turbine 9 is the corresponding feedwater pump power of annual operating mode of steam turbine, also, in running on the lower load
Under, can feed pump 11 be directly driven by the combination drive turbine 9, so as to reduce station-service electric current.
The therrmodynamic system of above-mentioned double reheat provided by the invention, mainly including steam turbine, bypass turbine and combination drive
Turbine by the Proper Match and running optimizatin between steam turbine, bypass turbine and combination drive turbine, makes steam turbine in difference
High, medium and low cylinder pressure under operating mode is in high efficient district, realizes the cascade utilization of energy to greatest extent, greatly improves generator
The economy of group.
It (that is, is not introduced into bypass turbine 7, auxiliary condenser 62, combination drive turbine 9 with conventional double reheat technology and becomes
The therrmodynamic system of frequency motor 10) it compares：
1) combination drive turbine 9 is improved than conventional feed pump small turbine efficiency up to more than 5%；
2) high pressure cylinder internal efficiency ratio rises about 0.6%, and low pressure (LP) cylinder internal efficiency ratio rises about 0.3%；
3) main condenser duty reduces, and host (steam turbine) back pressure reduces about 0.3kPa；
4) unit heat consumption reduces about 68.2kJ/kWh, and coal consumption reduces more than 2.6g/kWh；
5) unit station service power consumption rate declines about 4~5%.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In the skill of the present invention
In art conception range, a variety of simple variants can be carried out to technical scheme, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, belongs to
Protection scope of the present invention.
Claims (10)
1. a kind of therrmodynamic system of double reheat, which is characterized in that the therrmodynamic system includes steam turbine, condenser (6), bypass thoroughly
Flat (7), combination drive turbine (9) and high-pressure heater (12)；The steam turbine include ultra-high pressure cylinder (1), high pressure cylinder (2), in
Cylinder pressure (3) and low pressure (LP) cylinder (4)；The steam drain (P2) of the ultra-high pressure cylinder (1) respectively with the combination drive turbine (9) and described
High-pressure heater (12) connects, and extraction opening, the extraction opening and the hyperbaric heating are provided on the combination drive turbine (9)
Device (12) connects；The steam drain (P3) of medium pressure cylinder (3) is connected respectively with the low pressure (LP) cylinder (4) and the bypass turbine (7),
The steam drain (P7) of the bypass turbine (7) is connected with the condenser (6).
2. therrmodynamic system according to claim 1, wherein, the condensation water of the condensation water out discharge of the condenser (6)
The high-pressure heater (12) is transported to by feed pump (11) after oxygen-eliminating device (13).
3. therrmodynamic system according to claim 2, wherein, the steam drain (P10) of the combination drive turbine (9) with it is described
Oxygen-eliminating device (13) connects；
Preferably, the pressure of the steam drain (P10) of the combination drive turbine (9) is more than or equal to the pressure of the oxygen-eliminating device (13)
Power.
4. therrmodynamic system according to claim 2, wherein, the power of combination drive turbine (9) output be used for for
Feed pump (11) energy supply；
Preferably, the power of combination drive turbine (9) output is less than or equal to the power of the feed pump (11)；
It is highly preferred that the combination drive turbine (9) is connected with adjustable frequency motor (10), to be that the feed pump (11) supplies jointly
Energy.
5. according to the therrmodynamic system described in any one in claim 1-4, wherein, the therrmodynamic system includes at least one high
Heater (12) is pressed, preferably includes 4-6 high-pressure heater (12)；
Preferably, at least one extraction opening is provided on the combination drive turbine (9), is preferably 4-6 extraction opening；
It is highly preferred that each extraction opening is corresponding with the high-pressure heater (12) respectively.
6. according to the therrmodynamic system described in any one in claim 1-5, wherein, the power output of the bypass turbine (7)
To auxiliary generator (8)；
Preferably, the auxiliary generator (8) is connected with secondary distribution equipment and is used to power to the secondary distribution equipment；
It is highly preferred that the secondary distribution equipment includes adjustable frequency motor (10), condensate pump, wind turbine, vacuum pump and environmental protection dress
At least one of put.
7. according to the therrmodynamic system described in any one in claim 1-6, wherein, the condenser (6) includes main condenser
(61) it is connected with auxiliary condenser (62), the steam drain (P6) of the low pressure (LP) cylinder (4) with the main condenser (61), the bypass
The steam drain of turbine (7) is connected with the auxiliary condenser (62).
8. therrmodynamic system according to claim 7, wherein, the condensation water out (P8) of the main condenser (61) and described
The condensation water out (P9) of condenser (62) is aided in be connected with identical condensing water conduit, the condensing water conduit and the oxygen-eliminating device
(13) connect.
9. according to the therrmodynamic system described in any one in claim 1-8, wherein, the steam drain (P3) of medium pressure cylinder (3)
The first regulating valve (S1) is provided between the air intake (P5) of the bypass turbine (7)；
Preferably, it is provided between the steam drain (P2) of the ultra-high pressure cylinder (1) and the air intake of the combination drive turbine (9)
Second regulating valve (S2).
10. according to the therrmodynamic system described in any one in claim 1-9, wherein, the bypass turbine (7) is saturating for pure condensate formula
It is flat；
Preferably, the combination drive turbine (9) is pumping back of the body formula turbine.
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