CN202100284U - Double-shaft turbo-generator set - Google Patents
Double-shaft turbo-generator set Download PDFInfo
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- CN202100284U CN202100284U CN2011201957500U CN201120195750U CN202100284U CN 202100284 U CN202100284 U CN 202100284U CN 2011201957500 U CN2011201957500 U CN 2011201957500U CN 201120195750 U CN201120195750 U CN 201120195750U CN 202100284 U CN202100284 U CN 202100284U
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- 230000000630 rising effect Effects 0.000 description 5
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Abstract
The utility model provides a double-shaft turbo-generator set capable of obviously shortening the lengths of a main steam pipeline and/or a reheating steam pipeline. The double-shaft turbo-generator set comprises a turbo-generator and a boiler, and is characterized in that the turbo-generator is arranged nearby a outlet header of a superheater of the boiler, so that a connecting pipeline of the boiler and the turbo-generator can be short enough; the elevation of the turbo-generator at least exceed more than 50% of the elevation of the outlet header of the superheater; and the turbo-generator adopts an elastic foundation and is supported by a civil engineering structure of a turbo-generator room.
Description
Technical field
The present invention relates to Turbo-generator Set, relate in particular to the twin shaft Turbo-generator Set.
Background technique
Along with the price of primary energy improves constantly, power industry is increasingly high to the pursuit of the efficient of the Turbo-generator Set in the thermal power plant, to reduce the operating cost of power station.The parameter that wherein improves Turbo-generator Set is to improve the main means of its efficient.The main steam pressure of steam turbine import develops into the ultra supercritical pressure of present 27MPa from the subcritical pressure boiler of 17MPa over nearly 20 years, and temperature reaches present 600 ℃ from 538 ℃, and reheat steam temperature develops into 600 ℃ from 538 ℃.The main steam pressure of estimating the fired power generating unit of future generation in 10 years from now on will reach 35MPa, and temperature will reach 7 ℃, and reheat steam temperature will reach 720 ℃.Along with the raising of steam parameter, to the increasingly high high temperature resistant and erosion-resisting requirement of material proposition of fired power generating unit.The material that wherein connects main steam line, the reheaing steam pipe of boiler and steam turbine develops into the ferritic alloyed steel of high Cr from common alloyed steel, and main steam and the reheaing steam pipe of estimating to be used for the fired power generating unit of future generation of 700 ℃, 720 ℃ steam parameters will adopt nickel-base alloy.The raising of pipeline material grade brings the pipeline price significantly to rise.The pipeline material of the ultra supercritical fired power generating unit of present 600 ℃ of grades accounts for the cost about 6.8% of unit; The pipeline material unit price of 700 ℃ fired power generating unit of future generation possibly improve more than 5 times in the future, and high like this pipeline price is brought very big problem to the commercial operational feasibility of 700 ℃ of units of future generation.
Turbo-generator Set is the capital equipment of power station, generally includes boiler, steam turbine, generator.Its working principle is: the steam that boiler burning produces gets into the steam turbine acting, makes steam turbine rotation, steam turbine link to each other with generator and drives the generator rotation, generator rotation output electric energy.
Conventional twin shaft Turbo-generator Set is made up of boiler, steam turbine and generator.The twin shaft Turbo-generator Set mainly contains two types of single reheat unit and double reheat units, and each cylinder of steam turbine is distributed on two axles, and every links to each other with a generator respectively.
The boiler of existing twin shaft unit has two kinds of П type boiler and tower boilers, is illustrated in figure 1 as single reheat twin shaft unit, generally comprises economizer, water cooled furnace wall, superheater 11 and reheater 12.Steam turbine in the steam turbine generator 14 generally comprises cylinders such as high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder.Two axles system of single reheat twin shaft unit distributes usually as follows: mode one, axle are 1 to be high-pressure cylinder-low pressure (LP) cylinder-generator; Axle is 2 for intermediate pressure cylinder-generator; Mode two, axle are 1 for high-pressure cylinder-intermediate pressure cylinder-generator; Axle is 2 for low pressure (LP) cylinder-generator.Two axles system of double reheat twin shaft unit distributes usually as follows: mode one, axle are 1 to be high-pressure cylinder-first intermediate pressure cylinder-second intermediate pressure cylinder-generator; Axle is 2 for low pressure (LP) cylinder-generator; Mode two, axle are 1 for high-pressure cylinder-first intermediate pressure cylinder-generator; Axle is 2 to be second intermediate pressure cylinder-low pressure (LP) cylinder-generator.Connecting tube between boiler 1 and the steam turbine has main steam line 112, cold reheaing steam pipe 124 and reheat heat steam line 123.Steam turbine generator 14 is arranged in the steam turbine building running layer that common absolute altitude is 12m～17m, and the steam turbine generator of two axle systems is arranged in parallel.The superheater outlet leg 110 of boiler, the inlet header 122 of reheater, outlet header 121 are arranged in the top of boiler, are generally about 80～90m like the 1000MW boiler.Therefore the absolute altitude of the import of the outlet of boiler 1 and steam turbine differs bigger, adds the horizontal arrangement length of each pipeline, and the main steam line between the machine stove and the length of reheaing steam pipe are bigger.With 1000MW unit tower boiler is example; Every main steam line 112 length between boiler superheater outlet header 110 and the steam turbine high-pressure cylinder are about 150m; And the main steam line between unit is generally formed by moving towards similar 4 or 2 pipelines, and the total amount of visible main steam line is bigger.Likewise, every length of the cold reheaing steam pipe 124 of steam turbine high-pressure cylinder to boiler reheater inlet header 122 is about 160m, the 170m that also has an appointment of the reheat heat steam line 123 of boiler reheater outlet header 121 and Steam Turbine Through IP Admission import.Cold reheaing steam pipe 124 and reheat heat steam line 123 are also formed by moving towards similar 4 or 2 pipelines, and the total amount of reheaing steam pipe is also bigger.
As shown in Figure 2; An existing imagination adopts the high low level of twin shaft steam turbine generator to arrange; One that is about in the twin shaft is arranged in boiler superheater 11 and reheater 12 exit regions, is generally about 80m～90m like the 1000MW boiler, and being called height, to put axle be 141; Another is arranged in the steam turbine building running layer that common absolute altitude is 12m～17m, is called that low to put axle be 142.This mode can be used for the single reheat unit, also can be used for the double reheat unit.Shown in Figure 2 is the double reheat unit, and it comprises single reheat device 12a, secondary reheater 12b, correspondingly comprises single reheat device inlet/ outlet header 122a, 121a, secondary reheater air inlet-outlet-housing 122b, 121b.For the single reheat unit, two axle systems distribute usually as follows: mode one, height are put axle system and are high-pressure cylinder-intermediate pressure cylinder-generator; The low axle of putting is 142 to be low pressure (LP) cylinder-generator; Mode two, height are put axle system and are high-pressure cylinder-generator; The low axle system of putting is intermediate pressure cylinder-low pressure (LP) cylinder-generator.For the double reheat unit, two axles system distributes usually as follows: it is 141 to be high-pressure cylinder-first intermediate pressure cylinder-second intermediate pressure cylinder-generator that mode one, height are put axle; The low axle of putting is 142 to be low pressure (LP) cylinder-generator; It is 141 for high-pressure cylinder-first intermediate pressure cylinder-generator that mode two, height are put axle; The low axle of putting is 142 to be second intermediate pressure cylinder-low pressure (LP) cylinder-generator.Connecting tube between boiler and the steam turbine has main steam line 112, cold reheaing steam pipe (corresponding double reheat unit for once cold reheaing steam pipe 1241, the cold reheaing steam pipe 1242 of secondary), reheat heat steam line (corresponding double reheat unit is reheat heat steam line 1231, secondary reheat heat steam line 1232).
Two axles system as put axle system by height to put axle system for height be high-pressure cylinder-first intermediate pressure cylinder-second intermediate pressure cylinder-generator; The low axle system of putting is low pressure (LP) cylinder-generator, though main steam line, it is the shortest that the length of first, second cold (heat) reheaing steam pipe can be reduced to, and the cross over pipe of outlet of second intermediate pressure cylinder and low pressure (LP) cylinder import need be set.Because second intermediate pressure cylinder outlet vapor pressure is lower, the bore of cross over pipe is bigger, and owing to high and low discrepancy in elevation reason that is, cross over pipe length is very long.Surplus vapour causes the low pressure (LP) cylinder hypervelocity in the cross over pipe in order to prevent to shut down, and the rapid cut-off valve door need be set on cross over pipe.For control low pressure (LP) cylinder rotating speed during with operation when the startup and shutdown of units, the adjusting steam valve need be set on cross over pipe.Because the cross over pipe bore is very big, the rapid cut-off valve door is regulated steam valve manufacture difficulty height with being provided with, and does not also have ripe product at present, and price is very expensive.
Two axle systems are high-pressure cylinder-first intermediate pressure cylinder-generator as put axle system by height; The low axle system of putting is that second intermediate pressure cylinder-low pressure (LP) cylinder-generator distributes; Though the length of main steam line, first cold (heat) reheaing steam pipe, the second cold reheated steam can be reduced to the shortest; But the length of the second reheat heat steam line does not reduce, and is the same with existing unit.The material of main steam line, the first reheat heat steam line and the second reheat heat steam line of existing ultra supercritical unit is your P92 high-temperature alloy steel of price; Therefore adopt this arrangement, the consumption of the high-temperature alloy steel P92 steel that price is the most expensive reduces limitedly.
Generally speaking, one of reason of the rising of the price of the high-temperature and pressure pipeline material between boiler and the steam turbine is the raising along with vapor pressure and temperature, and the pipeline unit price rises; Former two is that the unit of high parameter all is jumbo unit basically therefore; Unit capacity is big more, and boiler is high more, the interface position of boiler---and the absolute altitude of main-steam outlet header and reheated steam air inlet-outlet-housing is high more; The volume of boiler room and steam turbine building is big more; And the layout of steam turbine highly increases seldom, thus the pipeline that connects of machine stove two ends---the distance of boiler side and steamer pusher side is more and more far away, and the length of main steam and reheaing steam pipe is more and more longer.
Therefore, become an important topic if shorten the length of main steam and reheaing steam pipe.
Summary of the invention
The object of the present invention is to provide the twin shaft Turbo-generator Set, it can obviously shorten the length of main steam line and/or reheaing steam pipe.
For realizing the twin shaft Turbo-generator Set of said purpose; Comprise steam turbine generator and boiler; Be characterized in, steam turbine generator be arranged on boiler superheater outlet leg near, make that the connecting tube of boiler and steam turbine is enough short; The absolute altitude of steam turbine generator surpasses more than 50% of superheater outlet leg absolute altitude at least, and steam turbine generator adopts elastic base and supported by the steam turbine building civil engineering structure.
Described twin shaft Turbo-generator Set; Its further characteristics are; Steam turbine in the steam turbine generator is the single reheat steam turbine, and boiler is the single reheat boiler accordingly, and the boiler superheater outlet header links to each other through main steam line with the steam turbine high-pressure cylinder steam inlet; The steam turbine high-pressure cylinder steam-expelling port links to each other through cold reheaing steam pipe with the boiler reheater inlet header, and the boiler reheater outlet header links to each other through the reheat heat steam line with Steam Turbine Through IP Admission.
Described twin shaft Turbo-generator Set; Its further characteristics are; Steam turbine in the steam turbine generator is the double reheat steam turbine; Boiler is the double reheat boiler accordingly; The boiler superheater outlet header links to each other through main steam line with the steam turbine high-pressure cylinder steam inlet, and steam turbine high-pressure cylinder steam-expelling port and boiler single reheat device inlet header link to each other through cold reheaing steam pipe once, and boiler single reheat device outlet header links to each other through a reheat heat steam line with steam turbine first intermediate pressure cylinder; The steam turbine first intermediate pressure cylinder steam discharge links to each other through the cold reheaing steam pipe of secondary with boiler secondary reheater inlet header, and boiler secondary reheater outlet header links to each other through secondary reheat heat steam line with steam turbine second intermediate pressure cylinder.
Described twin shaft Turbo-generator Set, its further characteristics be, steam turbine is wet cooling gas turbine or indirect air cooling steam turbine, and the low pressure (LP) cylinder of steam turbine separates with condenser, and link to each other with exhaust steam pipe.
Described twin shaft Turbo-generator Set, its further characteristics be, steam turbine is a direct air-cooling turbine, and the low pressure (LP) cylinder of steam turbine is higher than the condenser of steam turbine.
Described twin shaft Turbo-generator Set, its further characteristics are that steam turbine is condensing steam turbine or sucking condensing turbine.
Described twin shaft Turbo-generator Set, its further characteristics be, boiler is no reheating boiler, and the steam turbine in the steam turbine generator is no reheat steam turbine.
Described twin shaft Turbo-generator Set, its further characteristics are that said boiler is П type boiler or tower boiler.
The steam turbine generator of existing twin shaft Turbo-generator Set is usually placed in the lower position in the independent steam turbine building, on the basis that its support is seated in ground is connected.But because boiler is higher, and boiler master vapour, hot interface is positioned at upper boiler again, so the length of the main steam of HTHPs such as the main vapour that is connected between boiler and the steam turbine, reheated steam and reheaing steam pipe is longer, the piping cost is higher; And pipeline is longer, can cause the corresponding increase of flow resistance, has reduced the efficient of unit.
Mostly the thermal power plant of building at present is overcritical and above high pressure high temperature turbosets, and the unit price of main vapour, the used heat-resisting alloy steel in reheating pipe road is higher, and the variation that main vapour, reheating pipe are tied to form this is very big to integral body investment influence; To 700 ℃ of units of the more high parameter of present exploitation because the unit price of used nickel-base alloy is higher, the variation that main vapour, reheating pipe are tied to form this in addition determined the feasibility of whole project investment.
The aforementioned techniques scheme is to the shortcoming of above-mentioned existing twin shaft Turbo-generator Set; The twin shaft steam turbine generator is arranged near near the high position boiler superheater outlet header and the reheater outlet header, makes the length of main steam line and reheaing steam pipe be reduced to the steam capacity of minimum, the resistance that reduces main steam line and reheaing steam pipe, radiation loss, reduction reheaing steam pipe and regulate inertia.
The clammy of existing routine directly is connected with turbine low pressure cylinder with the vapour condenser of indirect air cooling fired power generating unit, and low pressure (LP) cylinder and vapour condenser all are seated on the basis on ground, and both distances are quite near, and low pressure (LP) cylinder does not have exhaust steam pipe.Aforementioned techniques scheme difference with it is: turbine low pressure cylinder is separated with vapour condenser, link to each other with exhaust steam pipe, make low pressure (LP) cylinder can be arranged in a high position, the vapour condenser routine is arranged on the basis on ground.This layout has increased exhaust equipment of LP casing, because the exhaust steam pipe resistance makes the back pressure of steam turbine of the present invention rise to some extent, turbine efficiency will reduce slightly in theory.But this layout has reduced the resistance of reheaing steam pipe, makes turbine efficiency rise.The gains offset the losses with the indirect air cooling unit for the clammy of single reheat, and the steam turbine overall efficiency is constant basically, and the steam turbine overall efficiency rose after the gains offset the losses with the indirect air cooling unit for the clammy of double reheat.
Existing conventional Direct Air-cooled Unit, the steam turbine of Air-cooled Unit is arranged in low level, and on the elevated platform outside the steam turbine building that air cooling condenser is arranged, vapour condenser is higher than steam turbine, and low pressure (LP) cylinder is connected through exhaust steam pipe with the female pipe of air cooling condenser steam cooling.Aforementioned techniques scheme difference with it is: steam turbine is arranged in a high position, and the air cooling condenser position is constant, and low pressure (LP) cylinder is higher than vapour condenser.The aforementioned techniques scheme is compared with conventional Direct Air-cooled Unit, and the resistance of exhaust equipment of LP casing differs very little, and that the resistance of the reheaing steam pipe of aforementioned techniques scheme descends is bigger, therefore in general the present invention to improving Direct Air-cooled Unit efficient.
Description of drawings
Comprise that accompanying drawing is for providing the present invention further to be understood, accompanying drawing shows embodiments of the invention, and plays the effect of explaining the principle of the invention with this specification.
Fig. 1 is a kind of schematic representation of existing twin shaft Turbo-generator Set.
Fig. 2 is a kind of schematic representation of twin shaft Turbo-generator Set of imagination.
Fig. 3 is first embodiment's of a twin shaft Turbo-generator Set of the present invention schematic representation.
Fig. 4 is second embodiment's of a twin shaft Turbo-generator Set of the present invention schematic representation.
Fig. 5 is the 3rd embodiment's of a twin shaft Turbo-generator Set of the present invention schematic representation.
Fig. 6 is the 4th embodiment's of a twin shaft Turbo-generator Set of the present invention schematic representation.
Embodiment
First embodiment
As shown in Figure 3, the twin shaft Turbo-generator Set of this instance comprises:
---boiler 2; Boiler 2 is related domain single reheat boiler commonly used; Pattern is П type boiler or tower boiler (shown in Figure 3 is П type boiler); The boiler outside disposes deoxygenation bunker bay 25, and deoxygenation bunker bay 25 is positioned at steam turbine building, and the heating surface of boiler 2 comprises superheater 21 and reheater 22 and superheater outlet leg 210, heat outlet header 221 again;
---steam turbine generator 24, contain steam turbine and generator, steam turbine is related domain single reheat twin shaft condensed steam type wet cooling gas turbine or single reheat twin shaft condensed steam type indirect air cooling steam turbine commonly used, comprises a high-pressure cylinder, an intermediate pressure cylinder, two low pressure (LP) cylinders; With high-pressure cylinder-low pressure (LP) cylinder-motor is a system, is another axle system with intermediate pressure cylinder-motor;
---vapour condenser 23, be used for wet cooling gas turbine or indirect air cooling steam turbine, vapour condenser is connected with the basis on ground, is arranged in position lower in the steam turbine building; The low pressure (LP) cylinder of steam turbine is connected through exhaust equipment of LP casing 241 with vapour condenser;
---main steam line 212;
---cold reheaing steam pipe 224;
---reheat heat steam line 223;
---exhaust equipment of LP casing road 241.
The main steam of boiler superheater outlet header 210 gets into steam turbine high-pressure cylinder through main steam line 212, and the steam discharge of high-pressure cylinder gets into boiler reheater inlet header 222 through cold reheaing steam pipe 224.Steam through after boiler reheater 22 heating gets into Steam Turbine Through IP Admission via reheat heat steam line 223.The steam discharge of turbine low pressure cylinder gets in the vapour condenser 23 of its below through exhaust steam pipe 241.Pipeline Placement shown in Figure 3 is signal.
Because steam turbine generator 24 high-order layouts make the main steam line 212 of the connection between the machine stove and the existing routine techniques of length of reheaing steam pipe 223,224 reduce greatly, have practiced thrift the investment of pipeline.The cross over pipe length of intermediate pressure cylinder and low pressure (LP) cylinder is very short, approaches the cross over pipe of series flow turbine.Though, adopted high-order layout of steam turbine to cause the investment of steam turbine building civil engineering structure to rise to some extent, along with the raising of unit parameter, the investment of the pipeline saving investment that civil engineering structure increases thereupon rising is constant.It is estimated that for supercritical unit, the investment that investment that pipeline is practiced thrift and civil engineering structure increase is suitable, for the ultra supercritical unit, the investment that the investment that pipeline is practiced thrift increases greater than civil engineering structure, for fired power generating unit of future generation, both gaps will be huger.Because reheaing steam pipe length reduces greatly; Reduced the drag losses of reheated steam, improved Efficiency of Steam Turbine, turbine efficiency has been descended to some extent though the exhaust equipment of LP casing road has improved the back pressure of steam turbine; But both offset, and the overall efficiency of steam turbine is constant basically.The reduction of main steam, reheaing steam pipe length has also reduced pipeline storage vapour, has reduced adjusting inertia, has reduced the heat dissipation of pipeline loss.
Second embodiment
Embodiment's as shown in Figure 4 twin shaft Turbo-generator Set comprises:
---boiler 3, boiler 3 are related domain double reheat boiler commonly used, and pattern is П type boiler or tower boiler (shown in Figure 4 is П type boiler), and the boiler outside disposes deoxygenation bunker bay 35, and deoxygenation bunker bay 35 is positioned at steam turbine building; The heating surface of boiler 3 comprises superheater 31 and single reheat device 321, secondary reheater 322, single reheat device outlet header 3211, secondary reheater outlet header 3212, superheater outlet leg 210, single reheat device inlet header 3221, secondary reheater inlet header 3222;
---steam turbine generator 34, steam turbine generator 34 comprises steam turbine and generator, and steam turbine is related domain double reheat twin shaft condensed steam type wet cooling gas turbine or double reheat twin shaft condensed steam type indirect air cooling steam turbine commonly used; Comprise a high-pressure cylinder, one first intermediate pressure cylinder, one second intermediate pressure cylinder and two low pressure (LP) cylinders; With high-pressure cylinder-first mesolow cylinder-motor is a system; With second intermediate pressure cylinder-low pressure (LP) cylinder-motor is another axle system, or is a system with high-pressure cylinder-first mesolow cylinder-second intermediate pressure cylinder-motor, be that another axle is with low pressure (LP) cylinder-motor; Two axle systems can arrange along row, also can be arranged in parallel;
---vapour condenser 33, be used for wet cooling gas turbine or indirect air cooling steam turbine, vapour condenser is connected with the basis on ground, is arranged in position lower in the steam turbine building; The low pressure (LP) cylinder of steam turbine is connected through exhaust equipment of LP casing 341 with vapour condenser;
---main steam line 312;
---once cold reheaing steam pipe 3241;
---a reheat heat steam line 3231;
---the cold reheaing steam pipe 3242 of secondary;
---secondary reheat heat steam line 3232;
---exhaust equipment of LP casing road 341;
Among the embodiment shown in Figure 4; Especially it should be noted that; Steam turbine generator 34 is arranged in the running layer of steam turbine building; This running layer should be positioned at boiler superheater 31 and reheater 321,322 outlet header 310,3211,3212 near; Its particular location should make that the length of main steam line 312, single reheat steam line 3231,3241, double reheat steam line 3232,3242 is short as far as possible, and with respect to existing structure, the absolute altitude of steam turbine generator 34 is at more than 50% of superheater outlet leg absolute altitude.After the possible position of the relative boiler of steam turbine generator 34 and steam turbine building thereof has stokehold, furnace side and stove.Steam turbine generator 34 pedestals are supported by the civil engineering structure of steam turbine building, and pedestal adopts elastic base.Vapour condenser 33 is arranged in the bottom of steam turbine building, by the base support on ground.Vapour condenser 33 is arranged in turbine low pressure cylinder steam-expelling port below, and the two links through exhaust equipment of LP casing road 341.The civil engineering structure of steam turbine building and boiler steelframe are interconnected becomes an overall structure, and Fig. 4 does not represent structural type.
The main steam of boiler superheater outlet header 310 gets into steam turbine high-pressure cylinder through main steam line 312, and the steam discharge of high-pressure cylinder passes through once cold reheaing steam pipe 3241 and gets into boiler single reheat device inlet headers 3221.Steam through after 321 heating of boiler single reheat device flows out from single reheat device outlet header 3211, gets into one time reheat heat steam line 3231, gets into steam turbine first intermediate pressure cylinder again.The steam discharge of first intermediate pressure cylinder gets into boiler secondary reheater inlet header 3222 through the cold reheaing steam pipe 3242 of secondary.After 322 heating of boiler secondary reheater, enter into secondary reheat heat steam line 3232 from secondary reheater outlet header 3212, get into steam turbine second intermediate pressure cylinder again.The steam discharge of turbine low pressure cylinder gets in the vapour condenser 33 of its below through exhaust steam pipe 341.Pipeline Placement shown in Figure 4 is signal.
Because steam turbine generator is high-order arranges, make the existing routine techniques of length of main steam line, single reheat steam line and double reheat steam line of the connection between the machine stove reduce greatly in the present embodiment, practiced thrift the investment of pipeline.Second intermediate pressure cylinder of above-mentioned two kinds of cylinder methods of salary distribution and the cross over pipe length of low pressure (LP) cylinder are all very short.Though; Adopted high-order layout of steam turbine to cause the investment of steam turbine building civil engineering structure to rise to some extent; But raising along with unit parameter; The investment that civil engineering structure increases thereupon rising of the investment number of pipeline saving is constant, and because this instance is the double reheat unit, the savings of pipeline is more considerable.It is estimated, for supercritical unit and above parameter, the investment that the investment that pipeline is practiced thrift increases greater than civil engineering structure, for fired power generating unit of future generation, both gaps will be huger.Owing to once reduce greatly with double reheat steam line length; Reduced the drag losses of reheated steam, improved Efficiency of Steam Turbine, turbine efficiency has been descended to some extent though the exhaust equipment of LP casing road has improved the back pressure of steam turbine; But both offset, and the overall efficiency of steam turbine rises.The reduction of main steam, reheaing steam pipe length has also reduced pipeline storage vapour, has reduced adjusting inertia, has reduced the heat dissipation of pipeline loss.
The 3rd embodiment
As shown in Figure 5, the twin shaft Turbo-generator Set of this instance comprises:
---boiler 4, boiler 4 is related domain single reheat boiler commonly used, and pattern is the boiler of П type boiler or tower boiler (Fig. 5 is a П type boiler) or other patterns, and the boiler outside disposes deoxygenation bunker bay 45, and deoxygenation bunker bay 45 is positioned at steam turbine building; The heating surface of boiler 4 comprises superheater 41 and reheater 42, reheater inlet header 422, reheater outlet header 421, superheater outlet leg 410;
---steam turbine generator 44, comprise generator and steam turbine, steam turbine is related domain single reheat twin shaft condensed steam type direct air-cooling turbine commonly used, comprises a high-pressure cylinder, an intermediate pressure cylinder, two low pressure (LP) cylinders; With high-pressure cylinder-low pressure (LP) cylinder-motor is a system, is another axle system with intermediate pressure cylinder-motor, and two axle systems can arrange along row, also can be arranged in parallel;
---air cooling condenser 43, be used for direct air-cooling turbine, air cooling condenser is usually placed on the outer elevated platform of steam turbine building, and the low pressure (LP) cylinder of steam turbine is connected through exhaust equipment of LP casing 441 with air cooling condenser 43 on the air cooling island;
---main steam line 412;
---cold reheaing steam pipe 424;
---reheat heat steam line 423;
---exhaust equipment of LP casing road 441;
Especially what deserves to be mentioned is; Steam turbine generator 44 is arranged in the running layer of steam turbine building; This running layer is positioned near the outlet header 410,421 of boiler superheater 41, reheater 42; Its particular location should make that the length of main steam line 412, reheaing steam pipe 423,424 is short as far as possible, and with respect to existing structure, the absolute altitude of steam turbine generator 34 is at more than 50% of superheater outlet leg absolute altitude.After the possible position of the relative boiler 4 of steam turbine generator 44 and steam turbine building thereof has stokehold, furnace side and stove.The pedestal of steam turbine generator 44 is supported by the civil engineering structure of steam turbine building, and pedestal adopts elastic base.Air cooling condenser 43 (being arranged on the air cooling island 46) is arranged on the outer elevated platform of steam turbine.The civil engineering structure of steam turbine building and boiler steelframe are interconnected becomes an overall structure, and Fig. 5 does not represent structural type.
The main steam of boiler superheater outlet header 410 gets into steam turbine high-pressure cylinder through main steam line 412, and the steam discharge of high-pressure cylinder gets into boiler reheater inlet header 422 through cold reheaing steam pipe 424.Enter into reheat heat steam line 423 through boiler reheater 42 heating back steam through reheater outlet header 421, get into Steam Turbine Through IP Admission again.The steam discharge of turbine low pressure cylinder gets in the air cooling condenser 43 through exhaust steam pipe 441.Pipeline Placement shown in Figure 5 is signal.
Because steam turbine generator 44 high-order layouts make the main steam line of the connection between the machine stove and the existing routine techniques of length of reheaing steam pipe reduce greatly, practiced thrift the investment of pipeline in the present embodiment.The cross over pipe length of intermediate pressure cylinder and low pressure (LP) cylinder is very short, approaches the cross over pipe of series flow turbine.Though, adopted high-order layout of steam turbine to cause the investment of steam turbine building civil engineering structure to rise to some extent, along with the raising of unit parameter, the investment that civil engineering structure increases thereupon rising of the investment number of pipeline saving is constant.It is estimated that for supercritical unit, the investment that investment that pipeline is practiced thrift and civil engineering structure increase is suitable, for the ultra supercritical unit, the investment that the investment that pipeline is practiced thrift increases greater than civil engineering structure, for fired power generating unit of future generation, both gaps will be huger.Because reheaing steam pipe length reduces greatly, has reduced the drag losses of reheated steam, has improved Efficiency of Steam Turbine.The exhaust equipment of LP casing road enters air cooling condenser, compares with existing Direct Air-cooled Unit, and turbine back pressure is constant basically.Have benefited from the decline of reheated steam resistance, the overall efficiency of steam turbine rises.The reduction of main steam, reheaing steam pipe length has also reduced pipeline storage vapour, has reduced adjusting inertia, has reduced the heat dissipation of pipeline loss.
The 4th embodiment
Twin shaft Turbo-generator Set as shown in Figure 6 comprises:
---boiler 5, boiler 5 are related domain double reheat boiler commonly used, and pattern is the boiler of П type boiler or tower boiler (shown in Figure 6 is П type boiler) or other patterns, and boiler 5 outsides dispose deoxygenation bunker bay 55, and deoxygenation bunker bay 55 is positioned at steam turbine building; The heating surface of boiler comprises superheater 51 and single reheat device 521, secondary reheater 522, single reheat device outlet header 5211, secondary reheater outlet header 5212, superheater outlet leg 510, single reheat device inlet header 5221, secondary reheater inlet header 5222;
---steam turbine generator 54, comprise generator and steam turbine, steam turbine is related domain double reheat twin shaft condensed steam type direct air-cooling turbine commonly used, comprises a high-pressure cylinder, one first intermediate pressure cylinder, one second intermediate pressure cylinder and two low pressure (LP) cylinders; With high-pressure cylinder-first mesolow cylinder-motor is a system; With second intermediate pressure cylinder-low pressure (LP) cylinder-motor is another axle system; Or be a system with high-pressure cylinder-first mesolow cylinder-second intermediate pressure cylinder-motor; With low pressure (LP) cylinder-motor is another axle system, and two axle systems can arrange along row, also can be arranged in parallel;
---air cooling condenser 53, be positioned on the air cooling island 56, be used for direct air-cooling turbine, air cooling condenser is usually placed on the outer elevated platform of steam turbine building, and the low pressure (LP) cylinder of steam turbine is connected through exhaust equipment of LP casing 541 with air cooling condenser 53 on the air cooling island;
---main steam line 512;
---once cold reheaing steam pipe 5241;
---a reheat heat steam line 5231;
---the cold reheaing steam pipe 5242 of secondary;
---secondary reheat heat steam line 5232;
---exhaust equipment of LP casing road 541;
Especially what deserves to be mentioned is; Steam turbine generator 54 is arranged in the running layer of steam turbine building; This running layer is positioned near the outlet header 510,5211,5212 of boiler superheater 51 and reheater 521,522; Its particular location should make that the length of main steam line 512, single reheat steam line 5231,5241, double reheat steam line 5232,5242 is short as far as possible, and with respect to existing structure, the absolute altitude of steam turbine generator 34 is at more than 50% of superheater outlet leg absolute altitude.After the possible position of steam turbine generator 54 and the relative boiler of steam turbine building thereof has stokehold, furnace side and stove.The pedestal of steam turbine generator 54 is supported by the civil engineering structure of steam turbine building, and pedestal adopts elastic base.Air cooling condenser 53 is arranged on the outer elevated platform of steam turbine building.The civil engineering structure of steam turbine building and boiler steelframe are interconnected becomes an overall structure, and Fig. 6 does not represent structural type.
The main steam of boiler superheater outlet header 510 gets into steam turbine high-pressure cylinder through main steam line 512, and the steam discharge of high-pressure cylinder passes through once cold reheaing steam pipe 5241 and gets into boiler single reheat device inlet headers 5221.Steam through after 521 heating of boiler single reheat device flows out from single reheat device outlet header 5211, gets into one time reheat heat steam line 5231, gets into steam turbine first intermediate pressure cylinder again.The steam discharge of first intermediate pressure cylinder gets into boiler secondary reheater inlet header 5222 through the cold reheaing steam pipe 5242 of secondary.After 522 heating of boiler secondary reheater, enter into secondary reheat heat steam line 5232 from secondary reheater outlet header 5212, get into steam turbine second intermediate pressure cylinder again.The steam discharge of turbine low pressure cylinder gets in the air cooling condenser 53 through exhaust steam pipe 541.Pipeline Placement shown in this figure is signal.
Because steam turbine generator is high-order arranges, make the existing routine techniques of length of main steam line, single reheat steam line and double reheat steam line of the connection between the machine stove reduce greatly in the present embodiment, practiced thrift the investment of pipeline.Second intermediate pressure cylinder of above-mentioned two kinds of cylinder methods of salary distribution and the cross over pipe length of low pressure (LP) cylinder are all very short.Though; Adopted high-order layout of steam turbine to cause the investment of steam turbine building civil engineering structure to rise to some extent; But raising along with unit parameter; The investment that civil engineering structure increases thereupon rising of the investment number of pipeline saving is constant, and because this instance is the double reheat unit, the savings of pipeline is more considerable.It is estimated, for supercritical unit and above parameter, the investment that the investment that pipeline is practiced thrift increases greater than civil engineering structure, for fired power generating unit of future generation, both gaps will be huger.Owing to once reduce greatly with double reheat steam line length, reduced the drag losses of reheated steam, improved Efficiency of Steam Turbine.The exhaust equipment of LP casing road enters air cooling condenser, compares with existing Direct Air-cooled Unit, and turbine back pressure is constant basically.Have benefited from the decline of reheated steam resistance, the overall efficiency of steam turbine rises.The reduction of main steam, reheaing steam pipe length has also reduced pipeline storage vapour, has reduced adjusting inertia, has reduced the heat dissipation of pipeline loss.
Those skilled in the art can be obvious, can carry out various modifications and modification and without departing from the spirit and scope of the present invention to above-mentioned exemplary embodiment of the present invention.Therefore, be intended to that the present invention is covered and drop in appended claims and the come scope thereof to modification of the present invention and modification.
Claims (8)
1. twin shaft Turbo-generator Set; Comprise steam turbine generator and boiler; It is characterized in that, steam turbine generator be arranged on boiler superheater outlet leg near, make that the connecting tube of boiler and steam turbine is enough short; The absolute altitude of steam turbine generator surpasses more than 50% of superheater outlet leg absolute altitude at least, and steam turbine generator adopts elastic base and supported by the steam turbine building civil engineering structure.
2. twin shaft Turbo-generator Set as claimed in claim 1; It is characterized in that; Steam turbine in the steam turbine generator is the single reheat steam turbine, and boiler is the single reheat boiler accordingly, and the boiler superheater outlet header links to each other through main steam line with the steam turbine high-pressure cylinder steam inlet; The steam turbine high-pressure cylinder steam-expelling port links to each other through cold reheaing steam pipe with the boiler reheater inlet header, and the boiler reheater outlet header links to each other through the reheat heat steam line with Steam Turbine Through IP Admission.
3. twin shaft Turbo-generator Set as claimed in claim 1; It is characterized in that; Steam turbine in the steam turbine generator is the double reheat steam turbine; Boiler is the double reheat boiler accordingly; The boiler superheater outlet header links to each other through main steam line with the steam turbine high-pressure cylinder steam inlet, and steam turbine high-pressure cylinder steam-expelling port and boiler single reheat device inlet header link to each other through cold reheaing steam pipe once, and boiler single reheat device outlet header links to each other through a reheat heat steam line with steam turbine first intermediate pressure cylinder; The steam turbine first intermediate pressure cylinder steam discharge links to each other through the cold reheaing steam pipe of secondary with boiler secondary reheater inlet header, and boiler secondary reheater outlet header links to each other through secondary reheat heat steam line with steam turbine second intermediate pressure cylinder.
4. like claim 2 or 3 described twin shaft Turbo-generator Set, it is characterized in that steam turbine is wet cooling gas turbine or indirect air cooling steam turbine, the low pressure (LP) cylinder of steam turbine separates with condenser, and links to each other with exhaust steam pipe.
5. like claim 2 or 3 described twin shaft Turbo-generator Set, it is characterized in that steam turbine is a direct air-cooling turbine, the low pressure (LP) cylinder of steam turbine is higher than the condenser of steam turbine.
6. like claim 2 or 3 described twin shaft Turbo-generator Set, it is characterized in that steam turbine is condensing steam turbine or sucking condensing turbine.
7. twin shaft Turbo-generator Set as claimed in claim 1 is characterized in that boiler is no reheating boiler, and the steam turbine in the steam turbine generator is no reheat steam turbine.
8. twin shaft Turbo-generator Set as claimed in claim 1 is characterized in that, said boiler is П type boiler or tower boiler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201957500U CN202100284U (en) | 2011-06-10 | 2011-06-10 | Double-shaft turbo-generator set |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201957500U CN202100284U (en) | 2011-06-10 | 2011-06-10 | Double-shaft turbo-generator set |
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| CN202100284U true CN202100284U (en) | 2012-01-04 |
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| CN2011201957500U Expired - Lifetime CN202100284U (en) | 2011-06-10 | 2011-06-10 | Double-shaft turbo-generator set |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251817A (en) * | 2011-06-10 | 2011-11-23 | 中国电力工程顾问集团华东电力设计院 | Double-shaft steam turbine generator unit |
| CN103352733A (en) * | 2013-06-29 | 2013-10-16 | 内蒙古电力勘测设计院 | Longitudinal arrangement of turbine building of 350 MW NCB unit |
| CN108087047A (en) * | 2017-12-28 | 2018-05-29 | 江苏金通灵流体机械科技股份有限公司 | Turbine LP rotors and its electricity-generating method |
| CN114543065A (en) * | 2022-03-18 | 2022-05-27 | 清华大学 | Thermal power plant unit |
| CN115711385A (en) * | 2022-10-27 | 2023-02-24 | 西安热工研究院有限公司 | Connecting pipe system structure of boiler outlet header and steam turbine |
-
2011
- 2011-06-10 CN CN2011201957500U patent/CN202100284U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251817A (en) * | 2011-06-10 | 2011-11-23 | 中国电力工程顾问集团华东电力设计院 | Double-shaft steam turbine generator unit |
| CN103352733A (en) * | 2013-06-29 | 2013-10-16 | 内蒙古电力勘测设计院 | Longitudinal arrangement of turbine building of 350 MW NCB unit |
| CN103352733B (en) * | 2013-06-29 | 2016-02-10 | 内蒙古电力勘测设计院有限责任公司 | The longitudinal direction of the steam turbine building of 350MW level NCB unit is arranged |
| CN108087047A (en) * | 2017-12-28 | 2018-05-29 | 江苏金通灵流体机械科技股份有限公司 | Turbine LP rotors and its electricity-generating method |
| CN114543065A (en) * | 2022-03-18 | 2022-05-27 | 清华大学 | Thermal power plant unit |
| CN114543065B (en) * | 2022-03-18 | 2023-01-10 | 清华大学 | Thermal power plant unit |
| CN115711385A (en) * | 2022-10-27 | 2023-02-24 | 西安热工研究院有限公司 | Connecting pipe system structure of boiler outlet header and steam turbine |
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