CN203949155U - 1000MW ultra supercritical unit water supply system - Google Patents
1000MW ultra supercritical unit water supply system Download PDFInfo
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- CN203949155U CN203949155U CN201420331454.2U CN201420331454U CN203949155U CN 203949155 U CN203949155 U CN 203949155U CN 201420331454 U CN201420331454 U CN 201420331454U CN 203949155 U CN203949155 U CN 203949155U
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Abstract
The utility model discloses a kind of 1000MW ultra supercritical unit water supply system, comprise the oxygen-eliminating device, fore pump, feed pump and the high-pressure heater group that are arranged on boiler feed water end and connect successively, also comprise for driving the little steam turbine of feed pump and fore pump, described feed pump and fore pump drive by two shafts before and after little steam turbine respectively; The admission end of little steam turbine is connected with the main steam turbine in unit by main steam turbine extraction line, is provided with the first control valve of controlling steam flow on main steam turbine extraction line; The admission end of little steam turbine is also connected with auxiliary steam conveying device by auxiliary steam pipeline, is provided with for controlling the second control valve of auxiliary steam flow on auxiliary steam pipeline; Described little steam turbine is provided with independent little steam turbine condensing plant, and little steam turbine is connected by little turbine exhaust steam duct road with little steam turbine condensing plant.The power consumption startup stage that the utility model can greatly reducing generating set, reduces power plant's operating cost.
Description
Technical field
The utility model relates to thermal power generating technology field, specifically a kind of water supply system of thermal power generation unit.
Background technology
Water supply system is the main artery of thermal power generation unit, is related to safety, the economical operation of whole generating set.Water supply system is mainly comprised of oxygen-eliminating device, feed pump group, the large major part of high adding system three, its effect be condensate water after oxygen-eliminating device deoxygenation, through feed pump, boost again, by high-pressure heater heated feed water, to boiler, provide the feedwater with certain pressure and uniform temperature.
At present, feed pump when domestic 1000MW grade ultra supercritical unit of having gone into operation runs well in water supply system adopts Steam Turbine Driven mostly, makes full use of the steam of doing merit producing in this unit, can reduce power plant's operating cost; And startup stage, owing to also not producing the steam of HTHP in this unit, can only utilize electrically driven feed pump as starting feed pump, although the simple power consumption of electrically driven feed pump system is large, and unit starting conventionally need to be longer time, the expense startup stage of causing increases greatly.
Summary of the invention
The utility model technical issues that need to address are to provide a kind of 1000MW ultra supercritical unit water supply system, and power consumption startup stage of reducing generating set reduces power plant's operating cost.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
1000MW ultra supercritical unit water supply system, comprise the oxygen-eliminating device, fore pump, feed pump and the high-pressure heater group that are arranged on boiler feed water end and connect successively, also comprise for driving the little steam turbine of feed pump and fore pump, described feed pump and fore pump drive by two shafts before and after little steam turbine respectively; The admission end of little steam turbine is connected with the main steam turbine in unit by main steam turbine extraction line, is provided with the first control valve of controlling steam flow on main steam turbine extraction line; The admission end of little steam turbine is also connected with auxiliary steam conveying device by auxiliary steam pipeline, is provided with for controlling the second control valve of auxiliary steam flow on auxiliary steam pipeline; Described little steam turbine is provided with independent little steam turbine condensing plant, and little steam turbine is connected by little turbine exhaust steam duct road with little steam turbine condensing plant.
Improvement of the present utility model is: on the low pressure feed water pipeline between described oxygen-eliminating device and fore pump, be provided with electric gate valve and coarse strainer.
Improvement of the present utility model is: on the middle pressure feedwater piping between described fore pump and feed pump, be provided with flow-through orifice and smart trap valve.
Also improvement of the present utility model is: between described oxygen-eliminating device and the delivery port of feed pump, be also provided with feed pump recirculation conduit.
Owing to having adopted technique scheme, the technological progress that the utility model is obtained is:
The utility model system architecture simply, is easily controlled, the quantity of steam that adopts auxiliary steam conveying device to use the startup stage that little steam turbine is carried unit, realize boiler water filling and underrun, unit reaches after certain load, again steam source is switched to main steam turbine steam supply, meet the requirement starting without electrically driven feed pump, reduced power plant's operating cost, reduced water resources consumption.
The electric gate valve and the coarse strainer that on low pressure feed water pipeline between the utility model oxygen-eliminating device and fore pump, arrange, impurity that can elimination larger particles, the flow-through orifice and the smart trap valve that on middle pressure feedwater piping between fore pump and feed pump, arrange, for guaranteeing to enter the water quality of feed pump.The minimum recirculation confluent that the feed pump recirculation conduit Ke An feed pump manufactory also arranging between oxygen-eliminating device and the delivery port of feed pump provides is directly sent into boiler through high-pressure heater group, guarantee that main feed pump noise and vibration is no more than standard, and while avoiding boiler water requirement few main feed pump because of the too small generation cavitation of flow.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present utility model.
Wherein, 1, oxygen-eliminating device, 2, feed pump, 3, high-pressure heater group, 4, boiler, 5, main steam turbine, 6, little steam turbine, 7, main steam turbine extraction line, 8, auxiliary steam pipeline, 9, little turbine exhaust steam duct road, 10, little steam turbine condensing plant, 11. fore pumps, 12. auxiliary steam conveying devices, 13. feed pump recirculation conduits.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in further details:
1000MW ultra supercritical unit water supply system, its technological process as shown in Figure 1, comprise and be arranged on the water inlet end of boiler 4 connected oxygen-eliminating device 1, fore pump 11, feed pump 2 and high-pressure heater group 3 successively, also comprise little steam turbine 6, wherein feed pump 2 and fore pump 11 drive by little steam turbine 6.On low pressure feed water pipeline between oxygen-eliminating device and fore pump, be provided with electric gate valve and coarse strainer, on middle pressure feedwater piping between fore pump and feed pump, be provided with flow-through orifice and smart trap valve, between oxygen-eliminating device and the delivery port of feed pump, be also provided with feed pump recirculation conduit 13.
The two shafts in front and back of little steam turbine 6 are coaxially arranged for driving feed pump and fore pump with feed pump 2 fore pumps 11 respectively.Little steam turbine 6 is connected with the main steam turbine 5 in unit by main steam turbine extraction line 7, and the first control valve is set on main steam turbine extraction line 7, for controlling the steam flow from main steam turbine; Little steam turbine 6 is also connected with auxiliary steam conveying device 12 by auxiliary steam pipeline 8, and the second control valve is set on auxiliary steam pipeline, for controlling the flow of auxiliary steam; Auxiliary steam is by being provided by adjacent unit, and as being enlarging power plant, Ye Keyoulao factory vapour source provides auxiliary steam.Little steam turbine 6 is provided with independent little steam turbine condensing plant 10, and little steam turbine 6 is connected by little turbine exhaust steam duct road 9 with little steam turbine condensing plant 10, has abandoned the drawback of little steam turbine and the mutual interference of main steam turbine steam discharge phase, has improved the ability of antagonism mal-condition.
The startup stage of generating set, open the second control valve being arranged on auxiliary steam pipeline 8, introduce auxiliary steam as the driving vapour source of little steam turbine 6.Treat that unit moves to certain load, when main steam turbine steam discharge can meet little steam turbine 6 use vapour parameter request, open the first control valve being arranged on main steam turbine extraction line 7, close the second control valve being arranged on auxiliary steam pipeline 8, the steam that introducing the machine has been done work, as the driving vapour source of little steam turbine 6, has rationally utilized the heat of this unit steam.When unit breaks down, in this unit, can close the first control valve, open the second control valve, by auxiliary steam conveying device, to little steam turbine, carry vapour source, thereby greatly improve the unit capable flexibility of opening, stop transport, thereby realize under any operating mode and all can drive feed pump 2 by little steam turbine 6, without configuring again electrodynamic pump, drive feed pump, reduced power plant's in-fighting, under the prerequisite that guarantees unit safety operation, improved the economy of unit operation.
Claims (4)
1.1000MW ultra supercritical unit water supply system, comprise the oxygen-eliminating device (1), fore pump (11), feed pump (2) and the high-pressure heater group (3) that are arranged on boiler (4) water inlet end and connect successively, it is characterized in that: also comprise for driving the little steam turbine (6) of feed pump and fore pump, described feed pump (2) and fore pump (11) drive by two shafts before and after little steam turbine (6) respectively; The admission end of little steam turbine (6) is connected with the main steam turbine (5) in unit by main steam turbine extraction line (7), is provided with the first control valve of controlling steam flow on main steam turbine extraction line (7); The admission end of little steam turbine (6) is also connected with auxiliary steam conveying device (12) by auxiliary steam pipeline (8), is provided with for controlling the second control valve of auxiliary steam flow on auxiliary steam pipeline (8); Described little steam turbine (6) is provided with independent little steam turbine condensing plant (10), and little steam turbine (6) is connected by little turbine exhaust steam duct road (9) with little steam turbine condensing plant (10).
2. 1000MW ultra supercritical unit water supply system according to claim 1, is characterized in that: on the low pressure feed water pipeline between described oxygen-eliminating device (1) and fore pump (11), be provided with electric gate valve and coarse strainer.
3. 1000MW ultra supercritical unit water supply system according to claim 1, is characterized in that: on the middle pressure feedwater piping between described fore pump (11) and feed pump (2), be provided with flow-through orifice and smart trap valve.
4. 1000MW ultra supercritical unit water supply system according to claim 1, is characterized in that: between described oxygen-eliminating device (1) and the delivery port of feed pump (2), be also provided with feed pump recirculation conduit (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420331454.2U CN203949155U (en) | 2014-06-20 | 2014-06-20 | 1000MW ultra supercritical unit water supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420331454.2U CN203949155U (en) | 2014-06-20 | 2014-06-20 | 1000MW ultra supercritical unit water supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402839A (en) * | 2016-08-30 | 2017-02-15 | 山东电力工程咨询院有限公司 | Dual-boosting boiler water feed system for power station units |
| CN108180465A (en) * | 2018-02-10 | 2018-06-19 | 西安西热节能技术有限公司 | A kind of preposition pump control system of feed pump |
| CN113404558A (en) * | 2021-05-26 | 2021-09-17 | 华能南通燃机发电有限公司 | Steam-driven water feeding pump system applied to H-level gas turbine |
-
2014
- 2014-06-20 CN CN201420331454.2U patent/CN203949155U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402839A (en) * | 2016-08-30 | 2017-02-15 | 山东电力工程咨询院有限公司 | Dual-boosting boiler water feed system for power station units |
| CN108180465A (en) * | 2018-02-10 | 2018-06-19 | 西安西热节能技术有限公司 | A kind of preposition pump control system of feed pump |
| CN108180465B (en) * | 2018-02-10 | 2024-05-28 | 西安西热节能技术有限公司 | Front-mounted pump control system of water feed pump |
| CN113404558A (en) * | 2021-05-26 | 2021-09-17 | 华能南通燃机发电有限公司 | Steam-driven water feeding pump system applied to H-level gas turbine |
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Address after: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee after: China Electric Power Construction Group Hebei electric survey and Design Research Institute Co., Ltd. Address before: 050031 No. 6 Jianbei Street, Chang'an District, Shijiazhuang City, Hebei Province Patentee before: Hebei Province Power Surveying Design & Research Institute |