CN103925021A - High pressure and low pressure bypass system - Google Patents
High pressure and low pressure bypass system Download PDFInfo
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- CN103925021A CN103925021A CN201410151038.9A CN201410151038A CN103925021A CN 103925021 A CN103925021 A CN 103925021A CN 201410151038 A CN201410151038 A CN 201410151038A CN 103925021 A CN103925021 A CN 103925021A
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Abstract
The invention discloses a high pressure and low pressure bypass system. The high pressure and low pressure bypass system comprises a high pressure bypass system connected with a high pressure cylinder, a low pressure bypass system connected with an intermediate pressure cylinder and a low pressure cylinder, a circulation pipeline and a condenser. The high pressure bypass system comprises an overheating pipeline, a backheating pipeline and a high pressure bypass pipeline. The low pressure bypass system comprises a reheating pipeline and a reheating condensation pipeline. The circulation pipeline comprises a circulating water pipeline and a high pressure temperature reducing pipeline. The high pressure and low pressure bypass system has the advantages that the structure is reasonable, the service life is long, unit load adaptability is improved, and a unit can be suitable for frequent start and stop and rapid load rise and fall; under the working condition that a turbine is started or load shedding is conducted, the temperature and the pressure of live steam are reduced through the bypass system, and then the live steam is fed into a reheater, dry burning of the reheater is avoided, and therefore the reheater is protected; in the sudden shedding of part of or all of loads of the unit, a bypass is quickly opened, a working medium is recycled to the condenser, running stability of a boiler is changed, and motion of a safety valve is reduced and even avoided.
Description
Technical field
The present invention relates to steam turbine pressure and temperature reducing technical field, particularly a kind of system of high and low pressure bypasses.
Background technique
Hp by-pass system is arranged on steam turbine steam recirculation conduit, and it can pass through reducing-and-cooling plant by high one-level vapor pressure and temperature, is reduced to the regulation and control of low first class pressure and temperature.
System of high and low pressure bypasses moves under cold conditions, steam state, hot and high intermediate pressure cylinder combined launch, is subject to for a long time high temperature, High Pressure Difference erosion, vaporization, very easily damages.At present domestic have minority enterprise to produce this bypath system, and due to the difference of layout and the material therefor of system, the performance difference of this device is very large, and subject matter is: system and device Y type runner arrangement structure, and energy-conservation progression and inclination are unreasonable, very easily solicitous steam partial vaporization and cause cavitation, occur leaking, its induction pipe layout is unreasonable in addition, and its length needs more than 3 meters, impedance to noise transmission is less, and 10 decibels of following decay approximately can be provided.Therefore be in operation, noise ratio is larger, affects environmental protection, and simultaneously because structural configuration is not compact, waste material, increases cost, and occur that working life is short, and the defect such as waste energy.
Summary of the invention
The object of the invention is to for shortcomings and deficiencies of the prior art, provide a kind of rational in infrastructure, long service life, the adaptive system of high and low pressure bypasses of raising unit load, to address the above problem.
Technical problem solved by the invention can realize by the following technical solutions:
System of high and low pressure bypasses, comprising:
The hp by-pass system being connected with high-pressure cylinder,
The low-pressure bypass system being connected with intermediate pressure cylinder and low pressure (LP) cylinder,
Circulation loop,
Vapour condenser;
It is characterized in that, described hp by-pass system comprises:
Overheated pipeline, the two ends of described overheated pipeline are connected with Boiler Steam output terminal, high-pressure cylinder admission end respectively, on described overheated pipeline, are disposed with high pressure main stop valve, septum valve along steam direction of advance,
The backheat pipeline that two ends are connected with high-pressure cylinder steam output end, reheater admission end respectively, is provided with the hot check valve again to the circulation of reheater admission end by high-pressure cylinder steam output end on described backheat pipeline,
High pressure turbine by pipeline, described high pressure turbine by pipeline two ends respectively with boiler steam output end, the steam output end of hot check valve is connected again, on described high pressure turbine by pipeline, is provided with high pressure bypass valve;
Described low-pressure bypass system comprises:
Reheating pipe road, the two ends on described reheating pipe road are connected with reheater steam output end, intermediate pressure cylinder admission end respectively, intermediate pressure cylinder steam output end is connected with low pressure (LP) cylinder admission end, low pressure (LP) cylinder steam output end is connected with described vapour condenser admission end, on described reheating pipe road, be disposed with middle pressure main stop valve, reheat control valve along steam direction of advance, on described reheat control valve and be connected to the equalizing valve that dams
Hot condenser pipe again, one end of described hot condenser pipe again is connected with the admission end of described middle pressure main stop valve, the other end is connected with described vapour condenser admission end by a low voltage bypass valve, between described vapour condenser and the admission end of described hot check valve again, is also provided with ventilation valve;
Described circulation loop comprises:
Circulating water line, the two ends of described circulating water line are connected with described vapour condenser steam output end, boiler feed water end respectively, described circulating pipe curb current direction of advance is disposed with condensate pump, low-pressure heater, oxygen-eliminating device, feed water pump, high-pressure heater, described condensate pump output terminal is also connected with the admission end that the circulating water of vapour condenser enters end, described low voltage bypass valve by a vapour condenser spray water valve, a low voltage bypass desuperheat valve respectively
High pressure desuperheat pipeline, the output terminal of described high pressure desuperheat pipeline is connected with the admission end of described high pressure bypass valve, the input end of described high pressure desuperheat pipeline is connected with described feedwater delivery side of pump, and described high pressure desuperheat pipeline is disposed with high pressure turbine by desuperheat stop valve, high pressure turbine by desuperheat valve along current direction of advance.
Owing to having adopted technological scheme as above, beneficial effect of the present invention is: rational in infrastructure, long service life, raising unit load adaptability, make unit energy adapt to frequent start-stop and fast lifting load; Under steam turbine startup or removal of load operating mode, sending into reheater after initial steam pressure and temperature reducing, prevent reheater dry combustion method through bypath system, play the effect of protection reheater; When the unexpected removal of load of unit (all or part of load), bypass is opened soon, reclaims working medium to vapour condenser, changes the stability of now boiler operatiopn, reduces and even avoids safety valve action.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the principle schematic of system of high and low pressure bypasses of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
System of high and low pressure bypasses shown in Figure 1, comprises hp by-pass system 100, low-pressure bypass system 200, circulation loop 300 and vapour condenser 400.Hp by-pass system 100 comprises overheated pipeline 110, backheat pipeline 120 and high pressure turbine by pipeline 130, the two ends of overheated pipeline 110 are connected with the steam output end 510 of boiler 500, the admission end 611 of high-pressure cylinder 610 respectively, on overheated pipeline 110, are disposed with high pressure main stop valve 1, septum valve 2 along steam direction of advance.The two ends of backheat pipeline 120 are connected with the steam output end 612 of high-pressure cylinder 610, the admission end 720 of reheater 700 respectively, on backheat pipeline 120, be provided with the hot check valve 3 again being circulated to the admission end 720 of reheater 700 by the steam output end 612 of high-pressure cylinder 610, on the steam output end 710 of reheater 700, be also provided with a reheater pressure escape cock 14.High pressure turbine by pipeline 130 two ends respectively with the steam output end 510 of boiler 500, the steam output end of hot check valve 3 is connected again, is provided with high pressure bypass valve 4 on high pressure turbine by pipeline 130.
Low-pressure bypass system 200 comprises reheating pipe road 210 and hot condenser pipe 220 again, the two ends on reheating pipe road 210 are connected with the steam output end 710 of reheater 700, the admission end 621 of intermediate pressure cylinder 620 respectively, the steam output end 622 of intermediate pressure cylinder 620 is connected with the admission end 631 of low pressure (LP) cylinder 630, the steam output end 632 of low pressure (LP) cylinder 630 is connected with the admission end 410 of vapour condenser 400, on reheating pipe road 210, be disposed with middle pressure main stop valve 5, reheat control valve 6 along steam direction of advance, on reheat control valve 6 and be connected to the equalizing valve 7 that dams.One end of hot condenser pipe 220 is connected with the admission end of middle pressure main stop valve 5 again, and the other end is connected with the admission end 410 of vapour condenser 400 by a low voltage bypass valve 8, between the admission end of vapour condenser 400 and hotter check valve 3, is also provided with ventilation valve 9.
Circulation loop 300 comprises circulating water line 310 and high pressure desuperheat pipeline 320, the two ends of circulating water line 310 are connected with the steam output end 420 of vapour condenser 400, the feed-water end 520 of boiler 500 respectively, circulating water line 310 is disposed with condensate pump 20, low-pressure heater 30, oxygen-eliminating device 40, feed water pump 50, high-pressure heater 60 along current direction of advance, and condensate pump output terminal 21 is also connected with the admission end that the circulating water of vapour condenser 400 enters end 430, low voltage bypass valve 8 by a vapour condenser spray water valve 10, a low voltage bypass desuperheat valve 11 respectively.The output terminal of high pressure desuperheat pipeline 320 is connected with the admission end of high pressure bypass valve 4, the input end of high pressure desuperheat pipeline 320 is connected with the output terminal 51 of feed water pump 50, and high pressure desuperheat pipeline 320 is disposed with high pressure turbine by desuperheat stop valve 12, high pressure turbine by desuperheat valve 13 along current direction of advance.
The control function of high pressure turbine by of the present invention:
1, main steam pressure reaches high prescribing a time limit, and opens fast high pressure bypass valve 4 and prevents boiler 500 superpressures;
2, main steam pressure rate of rise is opened, and in the time that pressure rate of rise exceedes the first value, high pressure bypass valve 4 regulates to be opened, and while exceeding the second value, opens fast, ensures that main steam pressure changes steadily;
3,, while receiving steam turbine tripping operation or generator solution column signal, high pressure bypass valve 4 is opened rapidly;
4, high other pressure of desuperheating water reaches high prescribing a time limit, quick closedown high pressure bypass valve 4, and the vapor (steam) temperature of high pressure bypass valve 4 reaches in limited time high, quick closedown.
Low other control function of the present invention is as follows:
1,, according to Steam Turhine Adjustment stage pressure, the pressure that maintains reheated steam mates with unit load;
2, when reheated steam step-up ratio exceedes specified value, open fast low voltage bypass valve 8, maintain reheated steam pressure and steadily rise;
3, vapour condenser 400 pressure reach high limit (being that vacuum is low) or temperature and reach high limit or water level and reach high limit or low-pressure by pass temperature-lowering water pressure when low, quick closedown low voltage bypass valve 8, protection vapour condenser 400.
The hand-over process operations of bypass of the present invention is as follows:
1, the aperture that continues to increase reheat control valve 6 and high pressure bypass valve 4, makes it in full-gear, and in the time that reheat control valve 6 approaches standard-sized sheet, emergency drain valve cuts out; Meanwhile reduce the aperture of low voltage bypass valve 8, so that reheated steam pressure remains on certain scope.
2, open septum valve 2 and make main vapour enter high-pressure cylinder 610, close ventilation valve 9, open hot check valve 3 again, increase the aperture of septum valve, continue load up, because main vapour pressure maintains setting value, now high pressure bypass valve 4 apertures reduce;
3, septum valve 2 is controlled admission, and intermediate pressure cylinder 620 Starting mode complete.Now, reheat control valve 6 standard-sized sheets, low voltage bypass valve 8 complete shut-downs, overheated for preventing high-pressure cylinder 610 exhaust stage blades, increase as quickly as possible the aperture of septum valve 2, the steam flow that enters high-pressure cylinder 610 is equated with the steam flow that enters intermediate pressure cylinder 620, low pressure (LP) cylinder 610.
More than show and described basic principle of the present invention and major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (1)
1. system of high and low pressure bypasses, comprising:
The hp by-pass system being connected with high-pressure cylinder,
The low-pressure bypass system being connected with intermediate pressure cylinder and low pressure (LP) cylinder,
Circulation loop,
Vapour condenser;
It is characterized in that, described hp by-pass system comprises:
Overheated pipeline, the two ends of described overheated pipeline are connected with Boiler Steam output terminal, high-pressure cylinder admission end respectively, on described overheated pipeline, are disposed with high pressure main stop valve, septum valve along steam direction of advance,
The backheat pipeline that two ends are connected with high-pressure cylinder steam output end, reheater admission end respectively, is provided with the hot check valve again to the circulation of reheater admission end by high-pressure cylinder steam output end on described backheat pipeline,
High pressure turbine by pipeline, described high pressure turbine by pipeline two ends respectively with boiler steam output end, the steam output end of hot check valve is connected again, on described high pressure turbine by pipeline, is provided with high pressure bypass valve;
Described low-pressure bypass system comprises:
Reheating pipe road, the two ends on described reheating pipe road are connected with reheater steam output end, intermediate pressure cylinder admission end respectively, intermediate pressure cylinder steam output end is connected with low pressure (LP) cylinder admission end, low pressure (LP) cylinder steam output end is connected with described vapour condenser admission end, on described reheating pipe road, be disposed with middle pressure main stop valve, reheat control valve along steam direction of advance, on described reheat control valve and be connected to the equalizing valve that dams
Hot condenser pipe again, one end of described hot condenser pipe again is connected with the admission end of described middle pressure main stop valve, the other end is connected with described vapour condenser admission end by a low voltage bypass valve, between described vapour condenser and the admission end of described hot check valve again, is also provided with ventilation valve;
Described circulation loop comprises:
Circulating water line, the two ends of described circulating water line are connected with described vapour condenser steam output end, boiler feed water end respectively, described circulating pipe curb current direction of advance is disposed with condensate pump, low-pressure heater, oxygen-eliminating device, feed water pump, high-pressure heater, described condensate pump output terminal is also connected with the admission end that the circulating water of vapour condenser enters end, described low voltage bypass valve by a vapour condenser spray water valve, a low voltage bypass desuperheat valve respectively
High pressure desuperheat pipeline, the output terminal of described high pressure desuperheat pipeline is connected with the admission end of described high pressure bypass valve, the input end of described high pressure desuperheat pipeline is connected with described feedwater delivery side of pump, and described high pressure desuperheat pipeline is disposed with high pressure turbine by desuperheat stop valve, high pressure turbine by desuperheat valve along current direction of advance.
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| CN201410151038.9A CN103925021B (en) | 2014-04-15 | 2014-04-15 | System of high and low pressure bypasses |
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| CN201410151038.9A CN103925021B (en) | 2014-04-15 | 2014-04-15 | System of high and low pressure bypasses |
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| CN103925021A true CN103925021A (en) | 2014-07-16 |
| CN103925021B CN103925021B (en) | 2016-02-17 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105156161A (en) * | 2015-09-22 | 2015-12-16 | 湖南创元铝业有限公司 | Main reheat steam and main reheat steam bypass system |
| CN105545378A (en) * | 2016-01-14 | 2016-05-04 | 大唐(北京)能源管理有限公司 | Steam turbine protecting system and method during starting of power plant |
| CN105673101A (en) * | 2016-01-07 | 2016-06-15 | 山西漳泽电力股份有限公司电力技术研究中心 | Turbine with deep peak regulation function and thermodynamic system |
| CN105781630A (en) * | 2016-03-02 | 2016-07-20 | 王欣 | Bypass control system of electric power generation steam turbine |
| CN106150565A (en) * | 2016-07-14 | 2016-11-23 | 成都成发科能动力工程有限公司 | A kind of peak cutting device for power station orphan's net stable operation and control method thereof |
| CN106640237A (en) * | 2016-08-29 | 2017-05-10 | 华电电力科学研究院 | System for improving thermal power straight condensing unit flexibility and running method of system |
| CN106642053A (en) * | 2016-11-29 | 2017-05-10 | 武汉都市环保工程技术股份有限公司 | System of adopting coal gas with low heating value to conduct electricity generation |
| CN107002500A (en) * | 2014-11-24 | 2017-08-01 | Posco能源公司 | Turbine energy generating system and its emergency operation method with emergency operation device |
| JP2018063063A (en) * | 2016-10-11 | 2018-04-19 | 住友重機械工業株式会社 | Boiler system |
| CN108730765A (en) * | 2017-04-25 | 2018-11-02 | 中国石化工程建设有限公司 | A kind of steam system energy-saving device and method |
| CN109386324A (en) * | 2017-08-09 | 2019-02-26 | 斗山重工业建设有限公司 | Generating equipment and its control method |
| CN109854317A (en) * | 2019-02-13 | 2019-06-07 | 大唐绥化热电有限公司 | Steam Turbine integrated-type bypath system and control method |
| CN111120013A (en) * | 2019-12-13 | 2020-05-08 | 山东中实易通集团有限公司 | Reliable steam supply system under unavailable working condition of steam turbine generator unit |
| CN113324600A (en) * | 2021-04-21 | 2021-08-31 | 广西电网有限责任公司电力科学研究院 | Method for testing bypass capacity of FCB functional thermal power generating unit |
| CN113324599A (en) * | 2021-04-21 | 2021-08-31 | 广西电网有限责任公司电力科学研究院 | Bypass capacity test system of FCB function thermal power generating unit |
| CN113606001A (en) * | 2021-07-29 | 2021-11-05 | 中国能源建设集团华东电力试验研究院有限公司 | 600MW supercritical unit bypass system and bypass temperature control method thereof |
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| CN107002500B (en) * | 2014-11-24 | 2018-12-07 | Posco能源公司 | Turbine energy generating system and its emergency operation method with emergency operation device |
| CN107002500A (en) * | 2014-11-24 | 2017-08-01 | Posco能源公司 | Turbine energy generating system and its emergency operation method with emergency operation device |
| CN105156161A (en) * | 2015-09-22 | 2015-12-16 | 湖南创元铝业有限公司 | Main reheat steam and main reheat steam bypass system |
| CN105673101B (en) * | 2016-01-07 | 2017-12-01 | 山西漳泽电力股份有限公司电力技术研究中心 | A kind of steam turbine and therrmodynamic system with depth peak regulating function |
| CN105673101A (en) * | 2016-01-07 | 2016-06-15 | 山西漳泽电力股份有限公司电力技术研究中心 | Turbine with deep peak regulation function and thermodynamic system |
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| CN105781630A (en) * | 2016-03-02 | 2016-07-20 | 王欣 | Bypass control system of electric power generation steam turbine |
| CN106150565A (en) * | 2016-07-14 | 2016-11-23 | 成都成发科能动力工程有限公司 | A kind of peak cutting device for power station orphan's net stable operation and control method thereof |
| CN106640237B (en) * | 2016-08-29 | 2018-10-19 | 华电电力科学研究院 | A kind of system and its operation method improving thermoelectricity pure condensate unit flexibility |
| CN106640237A (en) * | 2016-08-29 | 2017-05-10 | 华电电力科学研究院 | System for improving thermal power straight condensing unit flexibility and running method of system |
| JP2018063063A (en) * | 2016-10-11 | 2018-04-19 | 住友重機械工業株式会社 | Boiler system |
| CN106642053A (en) * | 2016-11-29 | 2017-05-10 | 武汉都市环保工程技术股份有限公司 | System of adopting coal gas with low heating value to conduct electricity generation |
| CN108730765B (en) * | 2017-04-25 | 2020-04-07 | 中国石化工程建设有限公司 | Steam system energy-saving device and method |
| CN108730765A (en) * | 2017-04-25 | 2018-11-02 | 中国石化工程建设有限公司 | A kind of steam system energy-saving device and method |
| CN109386324A (en) * | 2017-08-09 | 2019-02-26 | 斗山重工业建设有限公司 | Generating equipment and its control method |
| CN109386324B (en) * | 2017-08-09 | 2022-01-18 | 斗山重工业建设有限公司 | Power generation apparatus and control method thereof |
| CN109854317A (en) * | 2019-02-13 | 2019-06-07 | 大唐绥化热电有限公司 | Steam Turbine integrated-type bypath system and control method |
| CN111120013A (en) * | 2019-12-13 | 2020-05-08 | 山东中实易通集团有限公司 | Reliable steam supply system under unavailable working condition of steam turbine generator unit |
| CN113324600A (en) * | 2021-04-21 | 2021-08-31 | 广西电网有限责任公司电力科学研究院 | Method for testing bypass capacity of FCB functional thermal power generating unit |
| CN113324599A (en) * | 2021-04-21 | 2021-08-31 | 广西电网有限责任公司电力科学研究院 | Bypass capacity test system of FCB function thermal power generating unit |
| CN113324599B (en) * | 2021-04-21 | 2022-06-24 | 广西电网有限责任公司电力科学研究院 | FCB function thermal power generating unit bypass capacity test system |
| CN113606001A (en) * | 2021-07-29 | 2021-11-05 | 中国能源建设集团华东电力试验研究院有限公司 | 600MW supercritical unit bypass system and bypass temperature control method thereof |
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