CN201972745U - Single-reheat thermal system - Google Patents
Single-reheat thermal system Download PDFInfo
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- CN201972745U CN201972745U CN2011200741320U CN201120074132U CN201972745U CN 201972745 U CN201972745 U CN 201972745U CN 2011200741320 U CN2011200741320 U CN 2011200741320U CN 201120074132 U CN201120074132 U CN 201120074132U CN 201972745 U CN201972745 U CN 201972745U
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Abstract
The utility model provides a single-reheat thermal system, which comprises a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a reheater, a small back pressure type steam exhauster and at least one regeneration device. The high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are connected in sequence. The reheater is disposed between the high-pressure cylinder and the medium-pressure cylinder. Steam not reheated by the reheater is obtained from the high-pressure cylinder so as to drive the small back pressure type steam exhauster, and the regeneration device exhausts steam from the small back pressure type steam exhauster. Thermal circle efficiency of the single-reheat thermal system in comparison to the existing single-reheat thermal system can be improved.
Description
Technical field
The utility model is applicable to the single reheat Turbo-generator Set, relates in particular to a kind of draw gas thermodynamic system of single reheat of little machine of back pressure type that disposes.
Background technique
The re-heating subsystem in the thermal power plant of the employing single reheat technology of prior art 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 single reheat technology to dispose heat regenerative system usually, the heat that draws gas with main steam turbine comes heat-setting water and feedwater by 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 is subjected to 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 single reheat thermodynamic system of two kinds of prior aries respectively.
In the thermodynamic system that single reheat main frame shown in Figure 1 draws gas, this thermodynamic system mainly comprises: high-pressure cylinder 101, intermediate pressure cylinder 102, low pressure (LP) cylinder 103, reheater 104, 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 directed to reheater 104, carry out heat temperature raising, enter the intermediate pressure cylinder 102 of steam turbine then, in the middle of the intermediate pressure cylinder 102 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.But the temperature of drawing gas after the heat is higher again, and the degree of superheat is big, and the energy of superheat section also is used to add hot water with the latent heat of vaporization, influences efficiency of thermal cycle.
In the single reheat main frame of Fig. 2 drew gas thermodynamic system, the middle pressure 202 of steam turbine was provided with 2 or 2 above extraction openings.The same bigger problem of the degree of superheat of drawing gas that exists of this thermodynamic system.
The model utility content
Above-mentioned deficiency at the single reheat thermodynamic system of prior art, the utility model mainly utilizes the steam before the heat again, drive the back pressure type little machine that draws gas, from drawing gas little machine, this back pressure type draws gas, utilize the lower little machine of the degree of superheat to draw gas and steam discharge, come heat-setting water and feedwater by backheat equipment such as heater.Compare with the single reheat thermodynamic system of prior art, the utility model can improve efficiency of thermal cycle.
According to an aspect of the present utility model, a kind of thermodynamic system of single reheat is provided, comprising: high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder, described high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder are connected successively; Reheater is arranged between described high-pressure cylinder and the described intermediate pressure cylinder; The back pressure type little machine that draws gas, from described high-pressure cylinder obtain without described reheater again the steam of heat to drive the described back pressure type little machine that draws gas; And at least one backheat equipment, draw gas from the described back pressure type little machine that draws gas.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, the described back pressure type little machine that draws gas further connects and drives a driven device.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, also comprise: the steam flow balance tube is communicated with described back pressure type and draws gas the output pipeline of little machine and the transmission pipeline between described intermediate pressure cylinder and the described low pressure (LP) cylinder to stablize the draw gas exhaust steam pressure of little machine of described back pressure type.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, when the required steam flow of described backheat equipment draws gas the exhaust steam flow of little machine greater than described back pressure type, replenish steam to described backheat equipment from described intermediate pressure cylinder.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, when the required steam flow of described backheat equipment draws gas the exhaust steam flow of little machine less than described back pressure type, draw gas little machine to the overflow of described intermediate pressure cylinder steam discharge from described back pressure type.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, also comprise: vapour condenser obtains steam and obtains the draw gas steam discharge of little machine of described back pressure type from described low pressure (LP) cylinder.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, also comprise: little machine starts exhaust steam pipe, connect described back pressure type draw gas little machine and described vapour condenser, drawing gas little machine with described back pressure type the described thermodynamic system start up period can't be to described vapour condenser steam discharge when the described intermediate pressure cylinder steam discharge.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, described backheat equipment is heater or oxygen-eliminating device.
According to a preferred embodiment of the present utility model, in above-mentioned thermodynamic system, also comprise: the condensed steam type little machine that draws gas, obtain steam driving the described condensed steam type little machine that draws gas from described intermediate pressure cylinder, and to the vapour condenser steam discharge.
Should be appreciated that the above generality of the utility model is described and the following detailed description all is exemplary and explanat, and be intended to provide further explanation for as claimed in claim the utility model.
Description of drawings
Comprise that accompanying drawing is for providing the utility model further to be understood, they are included and are constituted the application's a part, and accompanying drawing shows embodiment of the present utility model, and play the effect of explaining the utility model principle with this specification.In the accompanying drawing:
Fig. 1 shows the thermodynamic system of a kind of single reheat of prior art, 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 single reheat of prior art.
Fig. 3 shows the schematic structure according to an embodiment's of the present utility model single reheat thermodynamic system, wherein adopts the back pressure type little machine that draws gas.
Fig. 4 shows the schematic structure according to another embodiment's of the present utility model single reheat thermodynamic system.
Fig. 5 shows the schematic structure according to another embodiment's of the present utility model single reheat thermodynamic system.
Fig. 6 shows the schematic structure according to an embodiment's more of the present utility model single reheat thermodynamic system.
Embodiment
Now embodiment of the present utility model will be described with reference to the drawings in detail.Now will be in detail with reference to preferred embodiment of the present utility model, 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 to select from public term in the utility model, but some mentioned terms may be that the claimant selects by his or her judgement in the utility model specification, and its detailed meanings illustrates in the relevant portion of the description of this paper.In addition, require not only by employed actual terms, but also will understand the utility model by 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.By reasonably hot again, 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 application's model utility people 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 prior art, again after the heat draw gas be subjected to 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 utility model is at the above-mentioned situation of existing single 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 by heater, compare with existing thermodynamic system, can improve efficiency of thermal cycle.
First embodiment
Fig. 3 shows the schematic structure of the single reheat thermodynamic system of a preferred embodiment of the present utility model.As shown in Figure 3, single reheat thermodynamic system of the present utility model mainly comprises: high-pressure cylinder 301, intermediate pressure cylinder 302, low pressure (LP) cylinder 303, reheater 304, back pressure type draw gas little machine 305, backheat equipment 306.
Among the figure, high-pressure cylinder 301, intermediate pressure cylinder 302 and low pressure (LP) cylinder 303 are connected successively.Main steam by high-pressure cylinder 301 acting after, through be arranged between high-pressure cylinder 301 and the intermediate pressure cylinder 302 reheater 304 again the steam after the heat be delivered to intermediate pressure cylinder 302 and low pressure (LP) cylinder 303 successively.
According to the utility model, the back pressure type little machine 305 that draws gas is configured to obtain without reheater 304 steam of heat again from high-pressure cylinder 301, and this steam is used to drive the back pressure type little machine 305 that draws gas.In the running of this thermodynamic system, steam, for example cold reheat steam, turbine high-pressure level is drawn gas, vapour source such as heating steam in the middle of the boiler, enters this back pressure little machine 305 that draws gas by the draw gas admission piping of little machine 305 of back pressure type, and steam drives the back pressure type little machine 305 that draws gas and rotates.As shown in the figure, this back pressure type little machine 305 that draws gas can drive a driven device 309, for example equipment such as feed water pump, blower fan, generator, compressor.Then, from this back pressure type draws gas little machine 305, extract steam by extraction steam pipeline again and give two backheat equipment 306 shown in Fig. 3.In addition, the draw gas steam discharge of little machine 305 of back pressure type enters backheat equipment 306 by exhaust steam pipeline, and the heat of steam discharge and working-medium water are recovered in the circulation system by backheat equipment 306.For example, backheat equipment 306 of the present utility model can be heater or oxygen-eliminating device.In addition, the back pressure type of the present utility model little machine 305 that draws gas also can be guided to its steam discharge other regenerator, Auxiliary Steam or heat supply network.
According on the other hand of the present utility model, above-mentioned thermodynamic system can also comprise a steam flow balance tube 307.This steam flow balance tube 307 is communicated with back pressure types the draw gas output pipeline of little machine 305 and the transmission pipeline between intermediate pressure cylinder 302 and the low pressure (LP) cylinder 303, in order to stablize back pressure type the draw gas exhaust steam flow of little machine 305 of the exhaust steam pressure of little machine 305 and balance backheat equipment 306 required steam flows and back pressure type that draws gas.For example, when the required steam flow of backheat equipment 306 draws gas the exhaust steam flow of little machine 305 greater than back pressure type, replenish steam to backheat equipment 306 from intermediate pressure cylinder 302; And when the required steam flow of backheat equipment 306 draws gas the exhaust steam flow of little machine 305 less than back pressure type, draw gas little machine 305 to intermediate pressure cylinder 302 steam discharge overflows from 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 of 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.This little machine startup exhaust steam pipe 308 can draw gas little machine 305 at the start up period back pressure type of thermodynamic system can't be to vapour condenser 310 steam discharges when intermediate pressure cylinder 302 steam discharges.In addition, according to other embodiment of the present utility model, this little machine starts exhaust steam pipe 308 also can cause development unit or direct row to atmosphere.
In addition, the technological scheme of the utility model Fig. 3 and Fig. 5 is corresponding with the routine techniques scheme of Fig. 1.Wherein the back pressure type little machine that draws gas is provided with 1 grade of extraction opening, supporting 1 road extraction steam pipeline, corresponding 1 grade of backheat equipment.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 utility model.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 herein.In addition, unless 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.
Compare with Fig. 3, embodiment shown in Figure 4 is provided with three backheat equipment 406.In fact, according to the needs of practical application, the utility model can also be provided with the backheat equipment of greater number and not deviate from principle of the present utility model.
In addition, the technological scheme of Fig. 4 of the present utility model and Fig. 6 is corresponding with the technological scheme for example shown in Figure 2 of routine techniques, and wherein the back pressure little machine that draws gas is provided with 2 grades of extraction openings, supporting 2 road extraction steam pipelines, corresponding 2 grades of backheat equipment.Backheat equipment can be single-row 100% capacity heater among the figure, and this heater also can adopt biserial 50% capacity pattern.
The 3rd embodiment
Fig. 5 shows another preferred embodiment of the present utility model.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 herein.In addition, unless 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.
Compare with Fig. 3, embodiment shown in Figure 5 further is provided with a condensed steam type little machine 511 that draws gas.As shown in the figure, this condensed steam type little machine 511 that draws gas is arranged between intermediate pressure cylinder 502 and the vapour condenser 510, obtains steam to drive this condensed steam type little machine 511 that draws gas from intermediate pressure cylinder 502, draws gas little machine 511 to vapour condenser 510 steam discharges from this condensed steam type then.
In fact, in this technological scheme, kept conventional condensed steam type and drawn gas little machine 511 driving the feed water pump group, and driven equipment such as other pump, blower fan, generator, compressor with the back pressure little machine that draws gas.
The 4th embodiment
Fig. 6 shows another preferred embodiment of the present utility model.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 herein.In addition, unless 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.
Compare with Fig. 3, embodiment shown in Figure 6 further is provided with a condensed steam type draw gas little machine 611 and three backheat equipment 606.In fact, embodiment shown in Figure 6 combines above Fig. 4 and the second and the 3rd embodiment shown in Figure 5 difference with respect to first embodiment shown in Figure 3.
To sum up, the utility model is at the above-mentioned deficiency of prior art, 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 by heater, compare, can improve efficiency of thermal cycle with existing single reheat thermodynamic system.Simultaneously, the utility model has significantly reduced the steam flow that enters 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 ℃ single reheat ultra supercritical generator set, adopt the utility model back pressure 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 5,000 ten thousand, simultaneously efficiency of thermal cycle can improve approximately 0.2%, is equivalent to can economize on coal every year about 2000 tons, has good returns of investment.
In addition, can also be furnished with little machine exhaust steam flow balance piping in the technical solution of the utility model.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 technical solution of the utility model 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 technical solution of the utility model, the back pressure little machine that draws gas can be used for driving feed water pump group in the conventional scheme, also can keep the little machine of conventional condensed steam type and drive the feed water pump 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 variations and not depart from spirit and scope of the present utility model above-mentioned exemplary embodiment of the present utility model.Therefore, be intended to make the utility model to cover to drop in appended claims and the equivalence techniques scheme scope thereof to modification of the present utility model and modification.
Claims (9)
1. the thermodynamic system of a single reheat comprises:
High-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder, described high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder are connected successively;
Reheater is arranged between described high-pressure cylinder and the described intermediate pressure cylinder;
The back pressure type little machine that draws gas, from described high-pressure cylinder obtain without described reheater again the steam of heat to drive the described back pressure type little machine that draws gas; And
At least one backheat equipment draws gas from the described back pressure type little machine that draws gas.
2. thermodynamic system as claimed in claim 1 is characterized in that, the described back pressure type little machine that draws gas further connects and drives a driven device.
3. thermodynamic system as claimed in claim 1 is characterized in that, also comprises:
The steam flow balance tube is communicated with described back pressure type and draws gas the output pipeline of little machine and the transmission pipeline between described intermediate pressure cylinder and the described low pressure (LP) cylinder to stablize the draw gas exhaust steam pressure of little machine of described back pressure type.
4. thermodynamic system as claimed in claim 3 is characterized in that, when the required steam flow of described backheat equipment draws gas the exhaust steam flow of little machine greater than described back pressure type, replenishes steam from described intermediate pressure cylinder to described backheat equipment.
5. thermodynamic system as claimed in claim 3 is characterized in that, when the required steam flow of described backheat equipment draws gas the exhaust steam flow of little machine less than described back pressure type, draws gas little machine to the overflow of described intermediate pressure cylinder steam discharge from described 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 described back pressure type from described 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 described back pressure type draw gas little machine and described vapour condenser, and drawing gas little machine with described back pressure type the described thermodynamic system start up period can't be to described vapour condenser steam discharge when the described intermediate pressure cylinder steam discharge.
8. thermodynamic system as claimed in claim 1 is characterized in that, described backheat equipment is heater or oxygen-eliminating device.
9. thermodynamic system as claimed in claim 1 is characterized in that, also comprises:
The condensed steam type little machine that draws gas obtains steam driving the described condensed steam type little machine that draws gas from described intermediate pressure cylinder, and to the vapour condenser steam discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200741320U CN201972745U (en) | 2011-03-18 | 2011-03-18 | Single-reheat thermal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200741320U CN201972745U (en) | 2011-03-18 | 2011-03-18 | Single-reheat thermal system |
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| CN201972745U true CN201972745U (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200741320U Expired - Lifetime CN201972745U (en) | 2011-03-18 | 2011-03-18 | Single-reheat thermal system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678204A (en) * | 2011-03-18 | 2012-09-19 | 中国电力工程顾问集团华东电力设计院 | Single reheating thermal system |
| CN105258334A (en) * | 2015-11-11 | 2016-01-20 | 郭红伟 | Heating equipment afterheat recovery device |
| CN105863759A (en) * | 2016-04-19 | 2016-08-17 | 刘子旺 | Dead steam cooling and recycling system for steam-driven water feed pump in high-back-pressure modification system of wet-cold thermal power unit |
| CN110529207A (en) * | 2019-09-30 | 2019-12-03 | 大唐郓城发电有限公司 | 630 DEG C of double reheat power generation sets therrmodynamic systems and its optimization method |
-
2011
- 2011-03-18 CN CN2011200741320U patent/CN201972745U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678204A (en) * | 2011-03-18 | 2012-09-19 | 中国电力工程顾问集团华东电力设计院 | Single reheating thermal system |
| CN102678204B (en) * | 2011-03-18 | 2014-12-17 | 中国电力工程顾问集团华东电力设计院 | Single reheating thermal system |
| CN105258334A (en) * | 2015-11-11 | 2016-01-20 | 郭红伟 | Heating equipment afterheat recovery device |
| CN105863759A (en) * | 2016-04-19 | 2016-08-17 | 刘子旺 | Dead steam cooling and recycling system for steam-driven water feed pump in high-back-pressure modification system of wet-cold thermal power unit |
| CN110529207A (en) * | 2019-09-30 | 2019-12-03 | 大唐郓城发电有限公司 | 630 DEG C of double reheat power generation sets therrmodynamic systems and its optimization method |
| CN110529207B (en) * | 2019-09-30 | 2023-09-05 | 大唐郓城发电有限公司 | Thermodynamic system of 630 ℃ secondary reheating unit and optimization method thereof |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20110914 Effective date of abandoning: 20141217 |
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