CN102678207A - Thermodynamic system with twice reheating - Google Patents
Thermodynamic system with twice reheating Download PDFInfo
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- CN102678207A CN102678207A CN2011100668531A CN201110066853A CN102678207A CN 102678207 A CN102678207 A CN 102678207A CN 2011100668531 A CN2011100668531 A CN 2011100668531A CN 201110066853 A CN201110066853 A CN 201110066853A CN 102678207 A CN102678207 A CN 102678207A
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Abstract
The invention relates to a thermodynamic system with twice reheating, which comprises a high pressure cylinder, a first intermediate pressure cylinder, a second intermediate pressure cylinder, a low pressure cylinder, a second reheating device, a first backpressure steam-extraction machine, a second backpressure steam-extraction machine and at least one backheating device, wherein the high pressure cylinder, the first intermediate pressure cylinder and the low pressure cylinder are sequentially connected with one another; the first reheating device is arranged between the high pressure cylinder and the first intermediate pressure cylinder; the second reheating device is arranged between the first intermediate pressure cylinder and the second intermediate pressure cylinder; the first backpressure steam-extraction machine obtains steam which is not subjected to reheating by the first reheating device for drive; the second backpressure steam-extraction machine obtains steam which is not subjected to reheating by the second reheating device for drive; and at least one backheating device extracts steam from the first backpressure steam-extraction machine and the second backpressure steam-extraction machine. Compared with an existing thermodynamic system with twice reheating, the thermodynamic system provided by the invention can improve thermodynamic circulation efficiency.
Description
Technical field
The present invention is applicable to the double reheat Turbo-generator Set, relates in particular to a kind of draw gas thermodynamic system of double reheat of little machine of back pressure type that disposes.
Background technique
The re-heating subsystem in the thermal power plant of the employing double reheat technology of existing technology is roughly: the steam of having done the part merit in the main steam turbine is drawn once more heat, draw the back-steam turbine then and continue acting, to improve thermodynamic system efficiency.
Adopt the firepower electrical plant of double reheat technology to dispose heat regenerative system usually; The heat that draws gas with main steam turbine comes heat-setting water and feedwater through heater; The heat that draws gas all is recovered in the working-medium water, reduces the latent heat of vaporization discharging that circulating water is taken away, to improve thermodynamic system efficiency.
The best degree of superheat of drawing gas is low, with superheat section energy acting, and latent heat of vaporization portion of energy is used for backheat.But to the thermal power plant of re-heating subsystem is arranged, drawing gas after the heat receives reheating effect again, and temperature improves, and the degree of superheat increases thereupon, makes the energy that can be used to do work be used for heat-setting water and feedwater, influenced the efficient of thermodynamic cycle.
Fig. 1 and Fig. 2 show the double reheat thermodynamic system of two kinds of existing technologies respectively.
In the thermodynamic system that double reheat main frame shown in Figure 1 draws gas, this thermodynamic system mainly comprises: high-pressure cylinder 101, the first intermediate pressure cylinder 102-1, the second intermediate pressure cylinder 102-2, low pressure (LP) cylinder 103, the first reheater 104-1, the second reheater 104-2, condensed steam type draw gas little machine 105, backheat equipment 106 or the like.Wherein, the steam discharge of the high-pressure cylinder 101 of steam turbine is caused the first reheater 104-1, carries out heat temperature raising; Get into the first intermediate pressure cylinder 102-1 of steam turbine then; In the middle of the first intermediate pressure cylinder 102-1 of steam turbine, be provided with an extraction opening, draw steam from this extraction opening, heat-setting water and feedwater; Reclaim the latent heat of vaporization, improve efficiency of thermal cycle.Then, the first intermediate pressure cylinder 102-1 steam discharge causes the second reheater 104-2, carries out heat temperature raising; Get into the second intermediate pressure cylinder 102-2 then; Be provided with an extraction opening in the middle of the intermediate pressure cylinder 102-2, draw steam from this extraction opening, heat-setting water and feedwater; Reclaim the latent heat of vaporization, thereby improve efficiency of thermal cycle.But, once with double reheat after the temperature of drawing gas higher, the degree of superheat is big, the energy of superheat section also is used to add hot water with the latent heat of vaporization, influences efficiency of thermal cycle.
The steam turbine power generation unit of the existing technology double reheat of Fig. 1 is the single shaft pattern, 1 generator of each steam turbine Driven by Coaxial; The steam turbine power generation unit that the minority double reheat is arranged is twin shaft pattern (referring to Fig. 2), and different steam turbine split axles drive 2 generators, all have the bigger problem of the degree of superheat of drawing gas.
Summary of the invention
Above-mentioned deficiency to the double reheat thermodynamic system of existing technology; The present invention mainly utilizes the steam before the heat again; Drive the back pressure type little machine that draws gas; From this back pressure type draws gas little machine, draw gas, utilize the lower little machine of the degree of superheat to draw gas and steam discharge, come heat-setting water and feedwater through backheat equipment such as heater.Compare with the double reheat thermodynamic system of existing technology, the present invention can improve efficiency of thermal cycle.
According to an aspect of the present invention, a kind of thermodynamic system of double reheat is provided, has comprised: high-pressure cylinder, first intermediate pressure cylinder, second intermediate pressure cylinder and low pressure (LP) cylinder, said high-pressure cylinder, first intermediate pressure cylinder, second intermediate pressure cylinder are connected with low pressure (LP) cylinder successively; First reheater is arranged between said high-pressure cylinder and said first intermediate pressure cylinder; Second reheater is arranged between said first intermediate pressure cylinder and said second intermediate pressure cylinder; The first back pressure type little machine that draws gas, from said high-pressure cylinder obtain without said first reheater again the steam of heat to drive the said first back pressure type little machine that draws gas; The second back pressure type little machine that draws gas, from said first intermediate pressure cylinder obtain without said second reheater again the steam of heat to drive the said second back pressure type little machine that draws gas; And at least one backheat equipment, draw gas from said first back pressure type little machine and the said second back pressure type little machine that draws gas that draws gas.
According to a preferred embodiment of the present invention, in above-mentioned thermodynamic system, said first back pressure type little machine and the said second back pressure type little machine that draws gas that draws gas is connected respectively and drives a driven device.
According to a preferred embodiment of the present invention; In above-mentioned thermodynamic system; Also comprise: the first steam flow balance tube is communicated with said first back pressure type and draws gas output pipeline and the transmission pipeline between said first intermediate pressure cylinder and said second intermediate pressure cylinder of little machine to stablize the draw gas exhaust steam pressure of little machine of said first back pressure type; The second steam flow balance tube is communicated with said second back pressure type and draws gas output pipeline and the transmission pipeline between said second intermediate pressure cylinder and the said low pressure (LP) cylinder of little machine to stablize the draw gas exhaust steam pressure of little machine of said second back pressure type.
According to a preferred embodiment of the present invention; In above-mentioned thermodynamic system; When drawing gas the required steam flow of said backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine, replenish steam to said and first back pressure type backheat equipment that little machine is connected that draws gas from said first intermediate pressure cylinder greater than said first back pressure type with first back pressure type; When drawing gas the required steam flow of said backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine, replenish steam to said and second back pressure type backheat equipment that little machine is connected that draws gas from said second intermediate pressure cylinder greater than said second back pressure type with second back pressure type.
According to a preferred embodiment of the present invention; In above-mentioned thermodynamic system; When said and first back pressure type draw gas the required steam flow of backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine less than said first back pressure type, draw gas little machine to the said first intermediate pressure cylinder steam discharge overflow from said first back pressure type; When said and second back pressure type draw gas the required steam flow of backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine less than said second back pressure type, draw gas little machine to the said second intermediate pressure cylinder steam discharge overflow from said second back pressure type.
According to a preferred embodiment of the present invention, in above-mentioned thermodynamic system, also comprise: vapour condenser obtains steam and obtains the draw gas steam discharge of little machine of said second back pressure type from said low pressure (LP) cylinder.
According to a preferred embodiment of the present invention; In above-mentioned thermodynamic system; Also comprise: little machine starts exhaust steam pipe; Connect said second back pressure type draw gas little machine and said vapour condenser, drawing gas little machine with said second back pressure type the said thermodynamic system start up period can't be to said vapour condenser steam discharge when the said second intermediate pressure cylinder steam discharge.
According to a preferred embodiment of the present invention, in above-mentioned thermodynamic system, said backheat equipment is heater or oxygen-eliminating device.
Should be appreciated that the above generality of the present invention is described and following detailed description all is exemplary and illustrative, and be intended to further explanation is provided for as claimed in claim the present invention.
Description of drawings
Comprise that accompanying drawing is for providing the present invention further to be understood, they are included and are constituted the application's a part, and accompanying drawing shows embodiments of the invention, and play the effect of explaining the principle of the invention with this specification.In the accompanying drawing:
Fig. 1 shows the thermodynamic system of a kind of double reheat of existing technology, and this thermodynamic system has adopted the condensed steam type little machine that draws gas, and backheat equipment adopts the high degree of superheat steam in heat back again.
Fig. 2 shows the thermodynamic system of the another kind of double reheat of existing technology.
Fig. 3 shows the schematic structure of double reheat thermodynamic system according to an embodiment of the invention, wherein adopts the back pressure type little machine that draws gas.
Fig. 4 shows the schematic structure of double reheat thermodynamic system according to another embodiment of the present invention.
Fig. 5 shows the schematic structure of double reheat thermodynamic system according to still another embodiment of the invention.
Fig. 6 shows the schematic structure according to an embodiment's more of the present invention double reheat thermodynamic system.
Embodiment
Now with embodiments of the present invention will be described by referring to the drawings in detail.Now will be in detail with reference to the preferred embodiments of the present invention, its example is shown in the drawings.In the case of any possible, in institute's drawings attached, will use identical mark to represent same or analogous part.In addition; Although employed term is from public term, to select among the present invention; But some mentioned terms possibly be that the claimant selects by his or her judgement in the specification of the present invention, and its detailed meanings is explained in the relevant portion of the description of this paper.In addition, require not only through employed actual terms, but also will understand the present invention through the meaning that each term contained.
The brief description of term
Little machine: small turbine is the auxiliary turbine in the main steam turbine thermodynamic system.
Heat again: the steam of having done the part merit in the steam turbine drawn once more heat, draw the back-steam turbine then and continue acting.This mode is called heat again.Hot again through reasonably, can reduce exhaust steam moisture, improve efficiency of thermal cycle.
Condensed steam type: steam discharge is called condensed steam type to the steam turbine of subatmospheric vacuum vapour condenser.
Back pressure type: steam discharge is called back pressure type to the steam turbine that is higher than atmospheric piping or heat exchanger.
Draw gas: the intergrade before turbine discharge is extracted steam out.
The present inventor finds: the best degree of superheat of drawing gas is lower, with the acting of superheat section energy, and latent heat of vaporization portion of energy is used for backheat.But, to the thermal power plant that re-heating subsystem is arranged of existing technology, again after the heat draw gas receive reheating effect, temperature improves, the degree of superheat increases thereupon, makes the energy that can be used to do work be used for heat-setting water and feedwater, has influenced the efficient of thermodynamic cycle.Therefore, the present invention is directed to the existing above-mentioned situation of double reheat thermodynamic system, utilize the preceding steam of heat again; Drive the back pressure little machine that draws gas; From little machine, draw gas, utilize the lower little machine of the degree of superheat to draw gas and steam discharge, come heat-setting water and feedwater through heater; Compare with existing thermodynamic system, can improve efficiency of thermal cycle.
First embodiment
Fig. 3 shows the schematic structure of the double reheat thermodynamic system of a preferred embodiment of the present invention.As shown in Figure 3, double reheat thermodynamic system of the present invention mainly comprises: high-pressure cylinder 301, the first intermediate pressure cylinder 302-1, the second intermediate pressure cylinder 302-2, low pressure (LP) cylinder 303, the first reheater 304-1, the second reheater 304-2, first back pressure type draw gas little machine 305-1, second back pressure type draw gas little machine 305-2, a plurality of backheat equipment 306.
Among the figure, high-pressure cylinder 301, the first intermediate pressure cylinder 302-1, the second intermediate pressure cylinder 302-2 are connected with low pressure (LP) cylinder 303 successively.Main steam is through high-pressure cylinder 301; Through be arranged between the high-pressure cylinder 301 and the first intermediate pressure cylinder 302-1 the first reheater 304-1 again the steam after the heat be passed to the first intermediate pressure cylinder 302-1, then through be arranged between the first intermediate pressure cylinder 302-1 and the second intermediate pressure cylinder 302-2 the second reheater 304-2 again the steam after the heat be delivered to this second intermediate pressure cylinder 302-2 and low pressure (LP) cylinder 303 successively.
According to the present invention, the first back pressure type little machine 305-1 that draws gas is configured to obtain the steam of heat again without the first reheater 304-1 from high-pressure cylinder 301, and this steam is used to drive this first back pressure type little machine 305 that draws gas.In addition, the second back pressure type little machine 305-2 that draws gas is configured to obtain the steam of heat again without the second reheater 304-2 from the first intermediate pressure cylinder 302-1, and this steam is used to drive this second back pressure type little machine 305-2 that draws gas.In the running of this thermodynamic system; Steam; For example low-temperature primary reheated steam, turbine high-pressure level is drawn gas, boiler once in the middle of vapour source such as heating steam; Get into this first back pressure little machine 305-1 that draws gas through the draw gas admission piping of little machine 305-1 of first back pressure type, steam drives this first back pressure little machine 305-1 that draws gas and rotates.As shown in the figure, this first back pressure type little machine that draws gas can drive the first driven device 309-1, for example equipment such as feed water pump, blower fan, generator, compressor.Then, from this first back pressure type draws gas little machine, extract steam through extraction steam pipeline again and give two backheat equipment 306 shown in Fig. 3.In addition, the draw gas steam discharge of little machine of first back pressure type gets into those backheat equipment 306 through exhaust steam pipeline, and the heat of steam discharge and working-medium water are recovered in the circulation system through backheat equipment 306.For example, backheat equipment 306 of the present invention can be heater or oxygen-eliminating device.In addition, the first and second back pressure types of the present invention little machine that draws gas also can be guided to other regenerator, Auxiliary Steam or heat supply network with its steam discharge.
In addition; In the running of this thermodynamic system; Steam; For example press in low temperature double reheat steam, the steam turbine that certain level is drawn gas, vapour source such as heating steam in the middle of the boiler secondary, get into this second back pressure little machine 305-2 that draws gas through the draw gas admission piping of little machine 305-2 of second back pressure type, steam drives this second back pressure little machine 305-2 that draws gas and rotates.As shown in the figure, this second back pressure type little machine that draws gas can drive the second driven device 309-2, for example equipment such as feed water pump, blower fan, generator, compressor.Then, from this second back pressure type draws gas little machine, extract steam through extraction steam pipeline again and give two the backheat equipment 306 in addition shown in Fig. 3.In addition, the draw gas steam discharge of little machine of second back pressure type gets into those backheat equipment 306 through exhaust steam pipeline, and the heat of steam discharge and working-medium water are recovered in the circulation system through backheat equipment 306.
According to a further aspect in the invention, above-mentioned thermodynamic system can also comprise one first steam flow balance tube 307-1 and one second steam flow balance tube 307-2.This first steam flow balance tube 307-1 is communicated with first back pressure type draw gas output pipeline of little machine 305-1 and the transmission pipeline between the first intermediate pressure cylinder 302-1 and the second intermediate pressure cylinder 302-2, in order to stablize first back pressure type draw gas exhaust steam flow of little machine 305-1 of exhaust steam pressure and balance backheat equipment 306 required steam flows and first back pressure type of little machine 305-1 that draws gas.This second steam flow balance tube 307-2 is communicated with second back pressure type draw gas output pipeline of little machine 305-2 and the transmission pipeline between the second intermediate pressure cylinder 302-2 and the low pressure (LP) cylinder 303, in order to stablize second back pressure type draw gas exhaust steam flow of little machine 305-2 of exhaust steam pressure and balance backheat equipment 306 required steam flows and second back pressure type of little machine 305-2 that draws gas.For example, when drawing gas the required steam flow of backheat equipment that little machine is connected 306 when drawing gas the exhaust steam flow of little machine 305-1, replenish steam to above-mentioned backheat equipment 306 from the first intermediate pressure cylinder 302-1 greater than first back pressure type with first back pressure type; And, draw gas little machine 305-1 to the first intermediate pressure cylinder 302-1 steam discharge overflow from first back pressure type when drawing gas the required steam flow of backheat equipment that little machine is connected 306 when drawing gas the exhaust steam flow of little machine 305-1 less than first back pressure type with first back pressure type.When drawing gas the required steam flow of backheat equipment that little machine is connected 306 when drawing gas the exhaust steam flow of little machine 305-2, replenish steam to above-mentioned backheat equipment 306 from the second intermediate pressure cylinder 302-2 greater than second back pressure type with second back pressure type; And, draw gas little machine 305-2 to the second intermediate pressure cylinder 302-2 steam discharge overflow from second back pressure type when drawing gas the required steam flow of backheat equipment that little machine is connected 306 when drawing gas the exhaust steam flow of little machine 305-2 less than second back pressure type with second back pressure type.
In addition, in the embodiment shown in fig. 3, thermodynamic system also comprises a vapour condenser 310.As shown in the figure, this vapour condenser 310 can obtain steam from low pressure (LP) cylinder 303, also can obtain the draw gas steam discharge of little machine 305-2 of second back pressure type.
Particularly, this vapour condenser 310 draws gas with back pressure type and is connected via a little machine startup exhaust steam pipe 308 between the little machine 305-2.This little machine startup exhaust steam pipe 308 can draw gas little machine 305-2 at start up period second back pressure type of thermodynamic system can't be to vapour condenser 310 steam discharges when the second intermediate pressure cylinder 302-2 steam discharge.In addition, according to other embodiments of the invention, this little machine starts exhaust steam pipe 308 also can cause development unit or direct row to atmosphere.
In addition, the technological scheme of Fig. 3 of the present invention and Fig. 5 is corresponding with the routine techniques scheme of Fig. 1.Wherein, the steam turbine power generation unit is the single shaft pattern, generator of each steam turbine Driven by Coaxial.Backheat equipment can be single-row 1 100% capacity heater among the figure, and this heater also can adopt 2 50% capacity patterns of biserial certainly.
Second embodiment
Fig. 4 shows another preferred embodiment of the present invention.Particularly, the part that embodiment shown in Figure 4 is identical with Fig. 3 can directly be continued to use the description among above first embodiment, repeats no more here.In addition, only if special explanation is arranged in specification, the drawing reference numeral among Fig. 4 continue to use with Fig. 3 in identical order.For example, the label among the label among Fig. 4 401 and Fig. 3 301 indicates identical device or equipment.Among the figure, backheat equipment can be single-row 100% capacity heater, and this heater also can adopt biserial 50% capacity pattern.
Different with Fig. 3 is that embodiment's shown in Figure 4 steam turbine power generation unit is the twin shaft pattern, 2 generators of different steam turbine split axles drivings, i.e. generator among Fig. 41 and generator 2; And in the embodiment shown in fig. 3, the steam turbine power generation unit is the single shaft pattern, generator of each steam turbine Driven by Coaxial.
The 3rd embodiment
Fig. 5 shows another preferred embodiment of the present invention.Particularly, the part that embodiment shown in Figure 5 is identical with Fig. 3 can directly be continued to use the description among above first embodiment, repeats no more here.In addition, only if special explanation is arranged in specification, the drawing reference numeral among Fig. 5 continue to use with Fig. 3 in identical order.For example, the label among the label among Fig. 5 501 and Fig. 3 301 indicates identical device or equipment.
Different with Fig. 3 is, 2 grades of back pressure types of embodiment shown in Figure 5 the draw gas same equipment of little machine Driven by Coaxial, i.e. driven device 509-2 among Fig. 5; And in the embodiment shown in fig. 3,2 grades of back pressure types different betwixt mountains of little machine that draw gas drive different equipment, i.e. driven device 309-1 and 309-2 among Fig. 3.
The 4th embodiment
Fig. 6 shows another preferred embodiment of the present invention.Particularly, the part that embodiment shown in Figure 6 is identical with Fig. 3 can directly be continued to use the description among above first embodiment, repeats no more here.In addition, only if special explanation is arranged in specification, the drawing reference numeral among Fig. 6 continue to use with Fig. 3 in identical order.For example, the label among the label among Fig. 6 601 and Fig. 3 301 indicates identical device or equipment.
In fact, as shown in the figure, embodiment shown in Figure 6 has combined above Fig. 4 and the second and the 3rd embodiment shown in Figure 5 difference with respect to first embodiment shown in Figure 3.
At last, in above-mentioned each embodiment, can to once, double reheat all establishes the back pressure type little machine that draws gas, also can be only to wherein any again heat the back pressure type little machine that draws gas is set.
To sum up; The present invention is directed to the above-mentioned deficiency of existing technology, main utilize again steam before the heat to drive the back pressure little machine that draws gas, from little machine, draw gas; Utilize the lower little machine of the degree of superheat to draw gas and steam discharge; Come heat-setting water and feedwater through heater, compare, can improve efficiency of thermal cycle with existing double reheat thermodynamic system.Simultaneously, the present invention has significantly reduced the steam flow that gets into reheater, can reduce the heat exchange area of reheater, reduces the flow area in reheating pipe road, thereby significantly reduces the cost of re-heating subsystem.
For example; To 1 1000MW, 600 ℃ double reheat ultra supercritical generator set, adopt the back pressure of the present invention little machine thermodynamic system of drawing gas, compare with the conventional main steam turbine thermodynamic system of drawing gas; The thermodynamic system investment reduces about 1.5 hundred million; Simultaneously efficiency of thermal cycle can improve approximately 0.4%, is equivalent to can economize on coal every year about 4000 tons, has good returns of investment.
In addition, can also be furnished with little machine exhaust steam flow balance piping in the technological scheme of the present invention.This can stablize little machine exhaust steam pressure, required steam flow of balance backheat equipment and little machine exhaust steam flow.When the required steam flow of backheat equipment during, replenish steam to backheat equipment from main steam turbine intermediate pressure cylinder steam discharge greater than little machine exhaust steam flow; When the required steam flow of backheat equipment during less than little machine exhaust steam flow, from little machine steam discharge to the overflow of main steam turbine intermediate pressure cylinder steam discharge.Can improve flexible operation and reliability.
In addition, can also be furnished with little machine in the technological scheme of the present invention and start exhaust steam pipeline, can not when main steam turbine intermediate pressure cylinder exhaust steam pipeline discharges, can drain into vapour condenser, development unit or atmosphere when little machine steam discharge in the unit starting stage.Can satisfy the unit starting requirement.
In the technological scheme of the present invention, the back pressure little machine that draws gas can be used for driving the feed water pump group in the conventional scheme, also can keep the little machine drive water pump of conventional condensed steam type group, drives equipment such as other pump, blower fan, generator, compressor with the back pressure little machine that draws gas.Can satisfy the different configuration requirements of different power plant.
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. the thermodynamic system of a double reheat comprises:
High-pressure cylinder, first intermediate pressure cylinder, second intermediate pressure cylinder and low pressure (LP) cylinder, said high-pressure cylinder, first intermediate pressure cylinder, second intermediate pressure cylinder are connected with low pressure (LP) cylinder successively;
First reheater is arranged between said high-pressure cylinder and said first intermediate pressure cylinder;
Second reheater is arranged between said first intermediate pressure cylinder and said second intermediate pressure cylinder;
The first back pressure type little machine that draws gas, from said high-pressure cylinder obtain without said first reheater again the steam of heat to drive the said first back pressure type little machine that draws gas;
The second back pressure type little machine that draws gas, from said first intermediate pressure cylinder obtain without said second reheater again the steam of heat to drive the said second back pressure type little machine that draws gas; And
At least one backheat equipment draws gas from said first back pressure type little machine and the said second back pressure type little machine that draws gas that draws gas.
2. thermodynamic system as claimed in claim 1 is characterized in that, said first back pressure type little machine and the said second back pressure type little machine that draws gas that draws gas is connected respectively and drives a driven device.
3. thermodynamic system as claimed in claim 1 is characterized in that, also comprises:
The first steam flow balance tube is communicated with said first back pressure type and draws gas output pipeline and the transmission pipeline between said first intermediate pressure cylinder and said second intermediate pressure cylinder of little machine to stablize the draw gas exhaust steam pressure of little machine of said first back pressure type;
The second steam flow balance tube is communicated with said second back pressure type and draws gas output pipeline and the transmission pipeline between said second intermediate pressure cylinder and the said low pressure (LP) cylinder of little machine to stablize the draw gas exhaust steam pressure of little machine of said second back pressure type.
4. thermodynamic system as claimed in claim 3 is characterized in that,
When drawing gas the required steam flow of said backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine, replenish steam to said and first back pressure type backheat equipment that little machine is connected that draws gas from said first intermediate pressure cylinder greater than said first back pressure type with first back pressure type;
When drawing gas the required steam flow of said backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine, replenish steam to said and second back pressure type backheat equipment that little machine is connected that draws gas from said second intermediate pressure cylinder greater than said second back pressure type with second back pressure type.
5. thermodynamic system as claimed in claim 3 is characterized in that,
When said and first back pressure type draw gas the required steam flow of backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine less than said first back pressure type, draw gas little machine to the said first intermediate pressure cylinder steam discharge overflow from said first back pressure type;
When said and second back pressure type draw gas the required steam flow of backheat equipment that little machine is connected when drawing gas the exhaust steam flow of little machine less than said second back pressure type, draw gas little machine to the said second intermediate pressure cylinder steam discharge overflow from said second back pressure type.
6. thermodynamic system as claimed in claim 1 is characterized in that, also comprises:
Vapour condenser obtains steam and obtains the draw gas steam discharge of little machine of said second back pressure type from said low pressure (LP) cylinder.
7. thermodynamic system as claimed in claim 6 is characterized in that, also comprises:
Little machine starts exhaust steam pipe, connects said second back pressure type draw gas little machine and said vapour condenser, and drawing gas little machine with said second back pressure type the said thermodynamic system start up period can't be to said vapour condenser steam discharge when the said second intermediate pressure cylinder steam discharge.
8. thermodynamic system as claimed in claim 1 is characterized in that, said backheat equipment is heater or oxygen-eliminating device.
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| CN103498708A (en) * | 2013-10-10 | 2014-01-08 | 中国电力工程顾问集团华东电力设计院 | Air-cooling reheating unit system arranged in small back-pressure type steam turbine and used for driving feed pump |
| CN103806966A (en) * | 2014-03-14 | 2014-05-21 | 中国电力工程顾问集团华东电力设计院 | Double-reheat supercharged steam turbine thermal system |
| CN104454038A (en) * | 2014-11-27 | 2015-03-25 | 上海电气电站设备有限公司 | System and method for starting double-reheat stream turbine |
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| CN114458404A (en) * | 2021-12-24 | 2022-05-10 | 华能秦煤瑞金发电有限责任公司 | Double-reheat steam turbine system with double back pressure machines distributed |
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| CN103498708A (en) * | 2013-10-10 | 2014-01-08 | 中国电力工程顾问集团华东电力设计院 | Air-cooling reheating unit system arranged in small back-pressure type steam turbine and used for driving feed pump |
| CN103498708B (en) * | 2013-10-10 | 2016-01-13 | 中国电力工程顾问集团华东电力设计院有限公司 | The air cooling reheating embrittlement system of back pressure type small turbine drive feed water pump |
| CN103806966A (en) * | 2014-03-14 | 2014-05-21 | 中国电力工程顾问集团华东电力设计院 | Double-reheat supercharged steam turbine thermal system |
| CN103806966B (en) * | 2014-03-14 | 2016-01-13 | 中国电力工程顾问集团华东电力设计院有限公司 | Double reheat supercharging steam turbine thermodynamic system |
| CN104454038A (en) * | 2014-11-27 | 2015-03-25 | 上海电气电站设备有限公司 | System and method for starting double-reheat stream turbine |
| CN104454038B (en) * | 2014-11-27 | 2016-04-27 | 上海电气电站设备有限公司 | Double reheat steam turbine start up system and Starting mode |
| CN105822373A (en) * | 2015-01-08 | 2016-08-03 | 国电浙江北仑第发电有限公司 | Pressure-boosting main machine coaxial driving water feeding pump system comprising backpressure steam extraction small steam turbine |
| CN107313814A (en) * | 2017-06-23 | 2017-11-03 | 济南市琦泉热电有限责任公司 | A kind of coal-fired mud power plant system that can be lightened the burden for condenser and method |
| CN107313814B (en) * | 2017-06-23 | 2019-08-20 | 济南市琦泉热电有限责任公司 | A system and method for a coal-fired slime power plant capable of reducing the load on the condenser |
| CN109519347A (en) * | 2018-11-26 | 2019-03-26 | 中国华能集团清洁能源技术研究院有限公司 | Point-line-focusing solar and coal fired power plant complementary power generation system and its energy distributing method |
| CN111005776A (en) * | 2019-12-16 | 2020-04-14 | 北京国电蓝天节能科技开发有限公司 | Heat supply method and heat supply system based on low-pressure cylinder optical axis heat supply technology |
| CN114458404A (en) * | 2021-12-24 | 2022-05-10 | 华能秦煤瑞金发电有限责任公司 | Double-reheat steam turbine system with double back pressure machines distributed |
| CN114458404B (en) * | 2021-12-24 | 2023-10-31 | 华能秦煤瑞金发电有限责任公司 | Double-reheat steam turbine system with double backpressure machines distributed |
| CN114934828A (en) * | 2022-05-13 | 2022-08-23 | 华电电力科学研究院有限公司 | Operation method based on supercritical reheating type double-extraction heat supply backpressure unit system |
| CN114934828B (en) * | 2022-05-13 | 2023-08-22 | 华电电力科学研究院有限公司 | Method for putting supercritical reheating type double-pumping heat supply back pressure unit system into operation |
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