CN103925021B - System of high and low pressure bypasses - Google Patents
System of high and low pressure bypasses Download PDFInfo
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- CN103925021B CN103925021B CN201410151038.9A CN201410151038A CN103925021B CN 103925021 B CN103925021 B CN 103925021B CN 201410151038 A CN201410151038 A CN 201410151038A CN 103925021 B CN103925021 B CN 103925021B
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Abstract
The invention discloses a kind of system of high and low pressure bypasses, comprising: the hp by-pass system be connected with high-pressure cylinder, the low-pressure bypass system, circulation loop, the vapour condenser that are connected with intermediate pressure cylinder and low pressure (LP) cylinder; Hp by-pass system comprises: overheated pipeline, backheat pipeline, high pressure turbine by pipeline; Low-pressure bypass system comprises: reheating pipeline, reheating condenser pipe; Circulation loop comprises: circulating water line, high pressure desuperheat pipeline.Beneficial effect of the present invention is: rational in infrastructure, long service life, raising unit load adaptability, makes unit energy adapt to frequent start-stop and fast lifting load; Start at steam turbine or under removal of load operating mode, send after initial steam pressure and temperature reducing into reheater through bypath system, prevent reheater dry combustion method, playing 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, reduce and even avoid safety valve action.
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 recirculation conduit, and high one-level vapor pressure and temperature can be passed through reducing-and-cooling plant by it, are reduced to the regulation and control of low first class pressure and temperature.
System of high and low pressure bypasses runs under cold conditions, steam state, hot and senior school biology, for a long time by high temperature, High Pressure Difference erosion, vaporization, very easily damages.Domestic at present have minority enterprise to produce this bypath system, and due to the layout of system and the difference of material therefor, the performance difference of this device is very large, and subject matter is: system and device Y type runner arrangement structure, energy-conservation progression and inclination unreasonable, very easily solicitous steam partial vaporization and cause cavitation, occur leaking, its induction pipe is arranged unreasonable in addition, and its length needs more than 3 meters, less to the impedance of noise transmission, the decay of less than 10 decibels approximately can be provided.Therefore the noise ratio that is in operation is comparatively large, affect environmental protection, simultaneously because structural configuration is not compact, waste material, increase cost, and occur that working life is short, 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 solve the 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 be connected with high-pressure cylinder,
The low-pressure bypass system be 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, and described overheated pipeline is 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, described backheat pipeline is provided with the reheating check valve circulated to reheater admission end by high-pressure cylinder steam output end,
High pressure turbine by pipeline, described high pressure turbine by pipeline two ends are connected with the steam output end of boiler steam output end, reheating check valve respectively, and described high pressure turbine by pipeline is provided with high pressure bypass valve;
Described low-pressure bypass system comprises:
Reheating pipeline, the two ends of described reheating pipeline 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, described reheating pipeline presses main stop valve, reheat control valve in steam direction of advance is disposed with, described reheat control valve is connected to one and dams equalizing valve
Reheating condenser pipe, one end of described reheating condenser pipe 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, is also provided with ventilation valve between the admission end of described vapour condenser and described reheating check 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 also enters to hold with the circulating water of vapour condenser respectively by a vapour condenser spray water valve, a low voltage bypass desuperheat valve, the admission end of described low voltage bypass valve is connected
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 have employed technological scheme as above, beneficial effect of the present invention is: rational in infrastructure, long service life, raising unit load adaptability, makes unit energy adapt to frequent start-stop and fast lifting load; Start at steam turbine or under removal of load operating mode, send after initial steam pressure and temperature reducing into reheater through bypath system, prevent reheater dry combustion method, playing 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, reduce and even avoid safety valve action.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the principle schematic of system of high and low pressure bypasses of the present invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
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, and overheated pipeline 110 is 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, backheat pipeline 120 is provided with the reheating check valve 3 circulated to the admission end 720 of reheater 700 by the steam output end 612 of high-pressure cylinder 610, the steam output end 710 of reheater 700 is also provided with a reheater pressure vent valve 14.High pressure turbine by pipeline 130 two ends are connected with the steam output end 510 of boiler 500, the steam output end of reheating check valve 3 respectively, high pressure turbine by pipeline 130 are provided with high pressure bypass valve 4.
Low-pressure bypass system 200 comprises reheating pipeline 210 and reheating condenser pipe 220, the two ends of reheating pipeline 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, reheating pipeline 210 presses main stop valve 5, reheat control valve 6 in steam direction of advance is disposed with, reheat control valve 6 is connected to one and dams equalizing valve 7.One end of reheating condenser pipe 220 is connected with the admission end of middle pressure main stop valve 5, and the other end is connected with the admission end 410 of vapour condenser 400 by a low voltage bypass valve 8, is also provided with ventilation valve 9 between the admission end of vapour condenser 400 and reheating check valve 3.
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 also enters end 430 respectively by vapour condenser spray water valve 10, low voltage bypass desuperheat valve 11 with the circulating water of vapour condenser 400, the admission end of low voltage bypass valve 8 is connected.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 controlling functions of high pressure turbine by of the present invention:
1, main steam pressure reaches in limited time high, opens high pressure bypass valve 4 fast and prevents boiler 500 superpressure;
2, main steam pressure rate of rise is opened, and when pressure rate of rise is more than the first value, high pressure bypass valve 4 regulates to be opened, and opens fast more than during the second value, ensures main steam pressure change steadily;
When 3, 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 in limited time high, 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 controlling functions of the present invention is as follows:
1, according to Steam Turhine Adjustment stage pressure, the pressure maintaining reheated steam mates with unit load;
2, when reheated steam step-up ratio exceedes specified value, open low voltage bypass valve 8 fast, maintain reheated steam pressure and steadily rise;
3, vapour condenser 400 pressure reach high limit (namely vacuum is low) or temperature reach high limit or water level reach high limit or low-pressure by pass temperature-lowering water pressure low time, quick closedown low voltage bypass valve 8, protects vapour condenser 400.
The hand-over process operations of bypass of the present invention is as follows:
1, continue the aperture increasing reheat control valve 6 and high pressure bypass valve 4, make it to be in full-gear, when reheat control valve 6 is close to standard-sized sheet, emergency drain valve cuts out; Meanwhile reduce the aperture of low voltage bypass valve 8, remain on certain scope to make reheated steam pressure.
2, opening septum valve 2 makes main vapour enter high-pressure cylinder 610, closes ventilation valve 9, opens reheating check valve 3, increases the aperture of septum valve, continues load up, because main vapour pressure maintains setting value, now high pressure bypass valve 4 aperture reduces;
3, septum valve 2 controls admission, and intermediate pressure cylinder 620 Starting mode completes.Now, reheat control valve 6 standard-sized sheet, low voltage bypass valve 8 complete shut-down, for preventing high-pressure cylinder 610 exhaust stage blade overheated, increase the aperture of septum valve 2 as quickly as possible, the steam flow making to enter high-pressure cylinder 610 with enter intermediate pressure cylinder 620, low pressure (LP) cylinder 610 steam flow equal.
More than show and describe 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; what describe in above-described embodiment and specification 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.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1. system of high and low pressure bypasses, comprising:
The hp by-pass system be connected with high-pressure cylinder,
The low-pressure bypass system be 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, and described overheated pipeline is 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, described backheat pipeline is provided with the reheating check valve circulated to reheater admission end by high-pressure cylinder steam output end,
High pressure turbine by pipeline, described high pressure turbine by pipeline two ends are connected with the steam output end of boiler steam output end, reheating check valve respectively, and described high pressure turbine by pipeline is provided with high pressure bypass valve;
Described low-pressure bypass system comprises:
Reheating pipeline, the two ends of described reheating pipeline 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, described reheating pipeline presses main stop valve, reheat control valve in steam direction of advance is disposed with, described reheat control valve is connected to one and dams equalizing valve
Reheating condenser pipe, one end of described reheating condenser pipe 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, is also provided with ventilation valve between the admission end of described vapour condenser and described reheating check 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 also enters to hold with the circulating water of vapour condenser respectively by a vapour condenser spray water valve, a low voltage bypass desuperheat valve, the admission end of described low voltage bypass valve is connected
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;
The controlling functions of high pressure turbine by: 1), main steam pressure reach high in limited time, open high pressure bypass valve fast and prevent boiler superpressure; 2), when main steam pressure rate of rise is more than the first value, high pressure turbine by valve regulation is opened, and opens fast more than during the second value, ensures main steam pressure change steadily; 3), receive steam turbine tripping operation or generator solution column signal time, high pressure bypass valve is opened rapidly; 4), heavy pressure by-pass cooling water pressure reach high in limited time, quick closedown high pressure bypass valve, the vapor (steam) temperature of high pressure bypass valve reaches in limited time high, quick closedown;
Low voltage bypass controlling functions is as follows: 1), according to Steam Turhine Adjustment stage pressure, the pressure maintaining reheated steam mates with unit load; 2), reheated steam step-up ratio is when exceeding specified value, opens low voltage bypass valve fast, maintains reheated steam pressure and steadily rise; 3), condenser pressure reach high limit namely vacuum be low or temperature reach high limit or water level reach high limit or low-pressure by pass temperature-lowering water pressure is low time, quick closedown low voltage bypass valve, protects vapour condenser;
The hand-over process operations of bypass is as follows: 1), continue the aperture increasing reheat control valve and high pressure bypass valve, make reheat control valve and high pressure bypass valve be in full-gear, when reheat control valve is close to standard-sized sheet, emergency drain valve cuts out; Meanwhile reduce the aperture of low voltage bypass valve, remain on certain scope to make reheated steam pressure; 2), open septum valve and make main vapour enter high-pressure cylinder, close ventilation valve, open reheating check valve, increase the aperture of septum valve, continue load up, because main vapour pressure maintains setting value, now high pressure turbine by valve opening reduces; 3), septum valve control admission, Start-up Mode for Intermediate Pressure completes; Now, reheat control valve standard-sized sheet, low voltage bypass valve complete shut-down, for preventing high-pressure cylinder exhaust stage blade overheated, increases the aperture of septum valve as quickly as possible, the steam flow making to enter high-pressure cylinder with enter intermediate pressure cylinder, low pressure (LP) cylinder steam flow equal.
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| Application Number | Priority Date | Filing Date | Title |
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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 CN103925021A (en) | 2014-07-16 |
| CN103925021B true CN103925021B (en) | 2016-02-17 |
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| CN105781630A (en) * | 2016-03-02 | 2016-07-20 | 王欣 | Bypass control system of electric power generation steam turbine |
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| 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 |
| 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 |
| CN113324600B (en) * | 2021-04-21 | 2022-09-20 | 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 |
| CN113606001B (en) * | 2021-07-29 | 2023-07-04 | 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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