CN202851092U - Circulating water start-up system of steam turbine - Google Patents
Circulating water start-up system of steam turbine Download PDFInfo
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- CN202851092U CN202851092U CN 201220411899 CN201220411899U CN202851092U CN 202851092 U CN202851092 U CN 202851092U CN 201220411899 CN201220411899 CN 201220411899 CN 201220411899 U CN201220411899 U CN 201220411899U CN 202851092 U CN202851092 U CN 202851092U
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Abstract
The utility model discloses a circulating water start-up system of a steam turbine. The circulating water start-up system of the steam turbine comprises a circulating water pump set and a steam driving system. The circulating water pump set is connected with a water supply tank and drives recycled water to flow in a circulating water system of the steam turbine when in operation. The steam driving system comprises a frequently-used steam source, a spare seam source, a start-up steam source and a steam turbine set, wherein the frequently-used steam source, the spare seam source and the start-up steam source are connected with the steam turbine set and drive the steam turbine set to operate. The steam turbine set drives the circulating water pump set to operate. The circulating water start-up system of the steam turbine has the advantages that start-up of the steam turbine set is safe and reliable, power utilization at the stage of start and stop of the steam turbine set of an electric power plant is greatly saved, cost is reduced, and ability to meet the requirements of network load is enhanced at the same time.
Description
Technical field
The utility model relates to a kind of steam turbine system, particularly a kind of steam turbine water start-up system.
Background technique
Along with human industrial expansion, the energy resource supply problem has obtained increasing attention.Steam turbine is as the main power generating equipment of power plant, and its performance more and more comes into one's own.In the prior art, steam turbine is in start-up course, owing to also there is not steam to produce, often use electric pump to drive circulating water, as shown in Figure 1, steam turbine 122 and steam turbine 124 drive respectively heat pump 222 and heat pump 224, and electric pump 226 is in parallel with heat pump 222 and heat pump 224, jointly connect feed tank and economizer by pipeline.The start up period, heat pump 222 and heat pump 224 shut down, electric pump 226 outlets are provided with outlet portal and regulate bypass door, at unit starting water filling stage and other low flow rate conditions, when flow is lower than the regulation range (14%～100%) of electric pump hydraulic couplers, by electric pump 226 outlet regulating by-pass valve adjust fluxes.Along with feedwater flow rises, change gradually by by electric pump rotating speed control flow, open the electric pump outlet portal.Be furnished with 232 and water inlets of a total door of water inlet bypass door 234 in the boiler economizer import, a restricting orifice 236 is housed after bypass door, be used under low flow rate condition, improving the pressure of desuperheating water of superheater.When the feedwater flow that advances boiler during less than 258kg/s, the total door of water inlet is closed, and only opens bypass door; When feedwater flow during greater than 258kg/s, Zong Men and and bypass door all open.
Heat pump outlet only has an outlet portal, and the general minimum operating speed of steam turbine is about 3065rpm, and therefore in the low discharge stage, heat pump does not possess regulating power, can't directly start the circulating water operation with heat pump.According to present water supply system preparation, need electrically driven feedpump to boiler water supply in the boiler startup stage, when unit load reaches about 350MW-380MW, could carry out warming-up and red switch to steam turbine by the steam of steam turbine, electric pump could be stopped using after two heat pumps are incorporated system into.Yet the mode of using electric pump to start has the deficiency of following three aspects:
1 relies on electrically driven feedpump fully, starts to unit safety and brings threat.In case break down in the electric pump start-up course, whole unit just can not start.
2 because heat pump must be behind set grid-connection could red switch so that unit is long whole starting time, and the station service the long-play of electric pump has increased during this period the start up period has improved cost.
3 in warming-up and the red switch stage of feed pump turbine, and load can not increase, and has reduced the ability of responsive electricity grid workload demand behind the unit starting.
Those skilled in the art is devoted to develop a kind of new steam turbine water start-up system, the constraint and the inconvenience that start to break away from electric pump.
The model utility content
The technical problems to be solved in the utility model is in order to overcome in the prior art, and steam turbine water start-up system electric pump Starting mode is single, and system is unstable, station service increases, cost is high, and the deficiency of electrical network load response ability provides a kind of Novel steam turbine circulating water start-up system.
The utility model solves above-mentioned technical problem by following technical proposals:
A kind of steam turbine water start-up system, described circulating water start-up system comprises:
One circulating water pump group, described circulating water pump group is connected with a feed tank, drives in the running circulating water and flows in the circulation of described steam turbine;
One steam propulsion system, comprise vapour source commonly used, standby steam source, startup vapour source and steam turbine unit, described vapour commonly used source, standby steam source, startup vapour source are connected with described steam turbine unit and drive its operation, and described steam turbine unit drives described circulating water pump group running.
Preferably, described circulating water pump group by one the water inlet main road with is connected the water inlet bypass be connected with an economizer, described water inlet bypass arranges an inlet regulating valve.
Preferably, described circulating water pump group outlet port arranges a sensor, and described sensor is connected with a logic controller, and described logic controller is controlled described water inlet main road, the open and close valve of water inlet bypass and the switching degree of inlet regulating valve.
Preferably, described circulating water pump group comprises the first water pump and the second water pump, and described the first water pump and the second water pump are arranged in parallel, and drives respectively circulating water and flows.
Preferably, described steam turbine unit comprises the first steam turbine and the second steam turbine, drives respectively described the first water pump and the second pump operation.
Preferably, the pipeline diameter in described startup vapour source is 250mm, and design discharge is 0.3kg/s.
Preferably, described feed tank is connected with an oxygen-eliminating device.
Preferably, described startup vapour source is another steam turbine unit.
Preferably, described vapour commonly used source is the intermediate pressure cylinder part of described steam turbine.
Preferably, described standby steam source is the high-pressure cylinder part of described steam turbine.
In the utility model, but above-mentioned optimum condition combination in any on the basis that meets related domain general knowledge namely gets each preferred embodiment of the utility model.
Positive progressive effect of the present utility model is: the steam turbine unit starting is safe and reliable, has greatly saved the station service in power plant's steam turbine Unit Commitment stage, has reduced cost, has strengthened simultaneously the ability of responsive electricity grid workload demand.
Description of drawings
Fig. 1 is the principle schematic of steam turbine water start-up system in the prior art.
Fig. 2 is the principle schematic according to the steam turbine water start-up system under the specific embodiment of the present utility model.
Embodiment
Embodiment of the present utility model describes with reference to the accompanying drawings.In Figure of description, the element with similar structure or function will represent with identical component symbol.Accompanying drawing is each embodiment of the present utility model for convenience of explanation just, is not to carry out to the utility model the explanation of exhaustive, neither limit scope of the present utility model.
Fig. 2 shows the principle schematic of the steam turbine water start-up system under the specific embodiment of the present utility model.In this embodiment, vapour source 112 commonly used, standby steam source 114 and is connected vapour source 116 common connection and driving steam turbine 122 and steam turbines 124.Wherein, vapour source 112 commonly used is the intermediate pressure cylinder part of steam turbine, standby steam source 114 is the high-pressure cylinder part of steam turbine, starts vapour source 116 and can be the intermediate pressure cylinder part of another steam turbine unit, and also can be other vapour source part of another steam turbine unit.Steam turbine 122 and steam turbine 124 directly drive respectively heat pump 222 and heat pump 224.Heat pump 222 and heat pump 224 are parallel-connection structure, jointly drive circulating water water is pumped into economizer 230 from feed tank 214.Before those skilled in the art will appreciate that feed tank 214 oxygen-eliminating device 212 is set, steam turbine 122 and steam turbine 124 arrange stop valve, and these all belong to the content that industry is known, and are not repeated herein.Electric pump 226 can be in parallel with heat pump 222 and heat pump 224, is used for carrying out start-up performance when vapour can't be failed in vapour source 116 when starting.In another embodiment, electric pump 226 can directly save.
Economizer water inlet main road and economizer water inlet bypass are set between heat pump and the economizer.Economizer water inlet main road arranges stop valve 232, and economizer water inlet bypass arranges stop valve 234 and inlet regulating valve 238, has cancelled the scheme that restricting orifice is set in the water inlet bypass in the prior art.Reached the function that improves pressure of desuperheating water of superheater in the time of inlet regulating valve 238 adjust flux.
Those skilled in the art will appreciate that in thermoelectricity plant the design of steam turbine unit is different, so the number of devices in the reality is adjusted along with designing different with adapter path.For example, in the steam turbine unit of larger specification, the quantity of steam turbine and heat pump can be three even more, and in this case, corresponding three vapour sources need to connect and drive more steam turbine.
In a preferred embodiment, the outlet port of heat pump 222 and heat pump 224 arranges a sensor (scheming not shown), sensor is connected with a logic controller (scheming not shown), logic controller is controlled described water inlet main road stop valve 232 and water inlet bypass stop valve 234, and the switching degree of inlet regulating valve 238.In one embodiment, these sensors and logic controller can belong to the part of distributed control system (Distributed Control System " DCS ").Those skilled in the art will appreciate that distributed control system belongs to industry technology comparatively commonly used, the specific implementation problems such as practical wiring of sensor and logic controller are not repeated herein.
In reality starts, start vapour source 116 and drive the running of one of heat pump 222 or heat pump 224, heat pump pumps into economizer 230 with circulating water from feed tank 214, and this moment is by heat pump rotating speed control heat pump outlet pressure, by the inlet regulating valve 238 control feedwater flows of economizer water inlet bypass.When economizer is intake the bypass valve inlet outlet pressure differential less than a reservation threshold, and the heat pump rotating speed is during greater than minimum speed one reservation threshold (for the rotational speed regulation flow leaves allowance), the total door of logic controller control economizer water inlet is opened, and the heat pump control mode is transformed into rotating speed control feedwater flow.
When the steam turbine set grid-connection to certain load, rising along with the vapor pressure of commonly using vapour source 112, the pressure regulator valve that starts vapour source 116 progressively cuts out, and the work vapour source that starts heat pump switches to vapour source commonly used by original startup vapour source, uses subsequently vapour source commonly used to continue to drive and starts second heat pump.Owing in start-up course, start steam from adjacent steam turbine unit, and the user is more, in one embodiment, the standby steam source of steam turbine 122 or steam turbine 124 need drop into for subsequent use after satisfying the requirements at once, so that starting the standby steam source that can also rely on the machine when the vapour source goes wrong and keep the operation of heat pump.Simultaneously, electric pump 226 also can be used as driving arrangement use for subsequent use.
In one embodiment, steam turbine 122 and steam turbine 124 are the 50%BMCR steam feed pump, and corresponding startup this moment vapour source steam diameter is 250mm, and design discharge is 10kg/s.Those skilled in the art will appreciate that steam caliber and design discharge are different and change along with the specification of steam turbine unit.
Relatively traditional electric pump starts, and advantage of the present utility model embodies in the following areas:
1 has strengthened the safety and reliability of unit
According to the mode that electric pump starts, if electric pump breaks down, then before the electric pump fault was got rid of, unit can not start.And after using the heat pump startup instead, Starting mode is more flexible, when a heat pump breaks down, can also start with an other heat pump or electric pump, greatly increases the safety and reliability in unit starting stage.
2 have saved the station service in startup and shutdown of units stage
According to the statistics of each startup and shutdown of units motor pump works's electricity consumption, about cold start electric pump power consumption average out to 120,000 kw.h of each unit, average power consumption 20,000 kw.h during shutdown, then each unit cold conditions start-stop, electric pump the station service expense be 10.9 ten thousand.According to the situation of power plant's statistics, a unit overhauls every year at least one times, once mediates, and considers the variation of Rate of load condensate, and the possibility that mediating number of times increases increases.Therefore calculate according to annual 3 start-stops, start by using heat pump instead, can save a large amount of electricity expenses every year and use.
3 have strengthened the ability of responsive electricity grid workload demand behind the unit starting
Generally speaking, the mode of using electric pump to start about load 350MW, begins two steam turbines are carried out warming-up and red switch, and is consuming time generally about two hours, during load and can not increase.Start if use heat pump instead, responsive electricity grid workload demand quickly then, according to the load up speed of 3MW/min after the unit cold start, two hours can multiple electric 360MW.
Those skilled in the art is appreciated that equally the technical program not only can be applied in the construction project of steam turbine unit, can be applied in the field of dynamic engineering that other need to start the vapour source equally.
Although more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is limited by appended claims.Those skilled in the art can make various changes or modifications to these mode of executions under the prerequisite that does not deviate from principle of the present utility model and essence, but these changes and modification all fall into protection domain of the present utility model.
Claims (10)
1. a steam turbine water start-up system is characterized in that, described circulating water start-up system comprises:
One circulating water pump group, described circulating water pump group is connected with a feed tank, drives in the running circulating water and flows in the circulation of described steam turbine;
One steam propulsion system, comprise vapour source commonly used, standby steam source, startup vapour source and steam turbine unit, described vapour commonly used source, standby steam source, startup vapour source are connected with described steam turbine unit and drive its operation, and described steam turbine unit drives described circulating water pump group running.
2. steam turbine water start-up system as claimed in claim 1 is characterized in that, described circulating water pump group by one the water inlet main road with is connected the water inlet bypass be connected with an economizer, described water inlet bypass arranges an inlet regulating valve.
3. steam turbine water start-up system as claimed in claim 2, it is characterized in that, described circulating water pump group outlet port arranges a sensor, described sensor is connected with a logic controller, and described logic controller is controlled described water inlet main road, the open and close valve of water inlet bypass and the switching degree of inlet regulating valve.
4. want 1 to 3 each described steam turbine water start-up system such as right, it is characterized in that described circulating water pump group comprises the first water pump and the second water pump, described the first water pump and the second water pump are arranged in parallel, and drive respectively circulating water and flow.
5. want 4 each described steam turbine water start-up systems such as right, it is characterized in that described steam turbine unit comprises the first steam turbine and the second steam turbine, drive respectively described the first water pump and the second pump operation.
6. want 1 to 3 each described steam turbine water start-up system such as right, it is characterized in that the pipeline diameter in described startup vapour source is 250mm, design discharge is 0.3kg/s.
7. want 1 to 3 each described steam turbine water start-up system such as right, it is characterized in that described feed tank is connected with an oxygen-eliminating device.
8. want 1 to 3 each described steam turbine water start-up system such as right, it is characterized in that described startup vapour source is another steam turbine unit.
9. want 8 described steam turbine water start-up systems such as right, it is characterized in that, described vapour commonly used source is the intermediate pressure cylinder part of described steam turbine.
10. want 8 described steam turbine water start-up systems such as right, it is characterized in that, described standby steam source is the high-pressure cylinder part of described steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220411899 CN202851092U (en) | 2012-08-17 | 2012-08-17 | Circulating water start-up system of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220411899 CN202851092U (en) | 2012-08-17 | 2012-08-17 | Circulating water start-up system of steam turbine |
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| CN202851092U true CN202851092U (en) | 2013-04-03 |
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| CN 201220411899 Expired - Lifetime CN202851092U (en) | 2012-08-17 | 2012-08-17 | Circulating water start-up system of steam turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106801863A (en) * | 2017-02-06 | 2017-06-06 | 国家电网公司 | A kind of fired power generating unit feed water by-pass cuts the bypass valve control method during main road |
| CN107131019A (en) * | 2017-06-27 | 2017-09-05 | 山东琦泉能源科技有限公司 | It is a kind of to supplement the adjustment system and method that steam is incorporated to steam main |
| CN114483225A (en) * | 2022-02-24 | 2022-05-13 | 上海领晟制冷科技有限公司 | Expansion machine multi-parallel combined ORC power generation system and control method thereof |
-
2012
- 2012-08-17 CN CN 201220411899 patent/CN202851092U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106801863A (en) * | 2017-02-06 | 2017-06-06 | 国家电网公司 | A kind of fired power generating unit feed water by-pass cuts the bypass valve control method during main road |
| CN107131019A (en) * | 2017-06-27 | 2017-09-05 | 山东琦泉能源科技有限公司 | It is a kind of to supplement the adjustment system and method that steam is incorporated to steam main |
| CN114483225A (en) * | 2022-02-24 | 2022-05-13 | 上海领晟制冷科技有限公司 | Expansion machine multi-parallel combined ORC power generation system and control method thereof |
| CN114483225B (en) * | 2022-02-24 | 2024-03-15 | 上海领晟制冷科技有限公司 | Multi-parallel combined ORC power generation system of expansion machine and control method thereof |
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Granted publication date: 20130403 |
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