CN104775858A - Intermediate-pressure cylinder rapid starting system for thermal power generation unit set - Google Patents
Intermediate-pressure cylinder rapid starting system for thermal power generation unit set Download PDFInfo
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- CN104775858A CN104775858A CN201510177456.XA CN201510177456A CN104775858A CN 104775858 A CN104775858 A CN 104775858A CN 201510177456 A CN201510177456 A CN 201510177456A CN 104775858 A CN104775858 A CN 104775858A
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Abstract
The invention discloses an intermediate-pressure cylinder rapid starting system for a thermal power generation unit set. In the system, a steam-water system of a thermal power plant unit generator set is improved specific to a set adopting an intermediate-pressure cylinder starting way. The improvements are that: a cutoff valve (V1) and a regulating valve (V2) are added on an original reheated steam pipeline of a steam turbine of the set; a branch is added on a condensed water pipeline of the set, and condensed water flowing through the regulating valve (V5) is supplied to an adjacent set steam condenser; a branch is added on a main steam (or reheated steam) pipeline of an adjacent set, and steam flowing through a cutoff valve (V3) and a cooling and decompressing valve (V4) is supplied in front of an intermediate-pressure main steam valve of the steam turbine. By adopting the system, the starting grid-connection time of a coal burning (thermal) power plant unit set can be shortened, and the peaking performance of a coal burning (thermal) generator set is improved.
Description
Technical field
The present invention relates to a kind of improvement of unit style thermal power generation unit quick start system, be directed to the unit adopting Start-up Mode for Intermediate Pressure.Belong to coal fired power generation field, be particularly useful for big-and-middle-sized coal fired power generation monoblock.
Background technique
Burn a large amount of fossil fuel at thermal power generation unit, discharge a large amount of harmful gas and dust, under causing the background of climatic change and haze, the renewable energy power generation such as wind energy, solar energy is introduced electrical network more and more.But due to intermittence and the uncontrollability of renewable energy power generation, electrical network needs increasing spare capacity.On the one hand, be the specific national conditions that the thermal power generation of fuel occupies quite large proportion at present with coal based on China, have the long-term underrun of a large amount of thermal power generation unit, to realize, while ensureing enough reserve generation capacities, ensureing peaking performance.But thermal power generation unit runs at low load, its efficiency can be made significantly to reduce, rough estimation, under the power levels sending as much, low-load generating can than the fuel of many consumption 10% that generates electricity at full capacity, both reduce the Economy of generating, turn increase the discharge of harmful gas and dust; On the other hand, because the toggle speed of Gas Turbine Generating Units is faster than traditional Thermal generation unit, having installed some in current China electrical network, take rock gas as the jet dynamic control of fuel, for balancing the intermittence of renewable energy power generation.But the price of rock gas is higher and need a large amount of import, uses Gas Turbine Generating Units peak regulation if a large amount of, while raising electricity price, also the energy security of country is threatened.
In general, be in the thermal power generation unit of fuel with coal, boiler and steam turbine are all be made up of a large amount of thick-walled metal parts, first need ignition of the boiler and smooth combustion, and then heat these metal partss to operating temperature with given pace in its start-up course.So the starting time of generator set is very long, be difficult to meet the requirement for the quick peak regulation of electrical network.
So, need now a kind of system that can shorten Thermal generation unit starting time.First, after shortening the unit starting time, can reduce the fuel consumption of not doing work between the starting period, payment for initiation will reduce greatly, and decrease the pollutant emission in start-up course.Secondly, if the starting time of Thermal generation unit can meet the requirement of the quick peak regulation of electrical network, then can hanging net operation be stopped to be in hot stand-by duty part band low-load coal unit in former electrical network, improve the load of another part coal unit simultaneously, improve unit operation efficiency.Finally, if Thermal generation unit can reach the toggle speed of Gas Turbine Generating Units, be then beneficial to the cost reducing electricity price and power construction on the one hand at State-level, ensure national energy security on the other hand.
Summary of the invention
The present invention is on the basis of tradition coal-fired (firepower) power station monoblock steam-water pipeline design, and improve it, the steam introducing adjacent steam turbine, to start this steam turbine, while namely realizing boiler and steam turbine, starts respectively.
The object of this improvement is the quick startup of steam turbine under hot or warm state realizing being in stand-by state, to reach the quick response to scheduling load, and saves unit starting fuel.
According to an aspect of the present invention, send out in the base of design of monoblock at original firepower, a kind of quick start system of improvement is provided, be directed to the unit of intermediate pressure cylinder start-up.The part that described system is improved comprises: reheated steam switched system; Unit water budget regulating system.
According to a specific embodiment of the present invention, described reheated steam switched system comprises: this unit steam switches stop valve (V1), this unit steam switches modulating valve (V2), adjacent unit steam switches stop valve (V3), adjacent unit steam switches steam converter valve (V4), this unit reheated steam pipeline (P1), adjacent unit supply air line (P2).
Described unit reheated steam pipeline (P1) is the original pipeline of unit, and increases two valves newly thereon, and namely this unit steam switches stop valve (V1) and this unit steam switching modulating valve (V2).Wherein, this unit steam switches stop valve (V1) and play buffer action in this power generator turbine start-up course, and the boiler of this unit and steam turbine can be started respectively; This unit steam switches stop valve (V1) and after steam switching modulating valve (V2) terminates at this unit boiler startup, steam parameter reaches requirement, open to realize this unit steam gradually and combine steam supply with adjacent unit steam to this unit, and finally independent to this unit steam supply.
Described adjacent unit supply air line (P2) is newly-increased pipeline, before being connect and caused by the main steam of adjacent unit or reheated steam pipeline and press main stop valve in this power generator turbine, and increase two valves newly thereon, namely adjacent unit steam switches stop valve (V3) and adjacent unit steam switching steam converter valve (V4).Wherein, adjacent unit steam switching stop valve (V3) mainly plays buffer action.Adjacent unit steam switches steam converter valve (V4) and regulates the vapor (steam) temperature and pressure of drawing from adjacent unit when this unit starting, makes it the parameter matching with the requirement of this unit starting, as the machine impulsion, and constant speed, the grid-connected steam source with being with initial load.
According to a specific embodiment of the present invention, described unit water budget regulating system comprises: unit water budget modulating valve (V5), go adjacent unit condensate line (P3).
Wherein, go adjacent machine condensate line (P3) for newly-increased pipeline, be connected to adjacent unit condenser by this unit condensate line.And increase a valve, i.e. unit water budget modulating valve (V5) newly thereon.Its object is to the water of condensation of part the machine to be transmitted back to adjacent machine, to reach the object of two Unit Steam Water balances.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Figure 1 shows that according to the improved system of one provided by the invention on the basis of tradition coal-fired (firepower) power station monoblock steam-water pipeline design, be directed to the unit adopting intermediate pressure cylinder start-up.
In accompanying drawing, the region of dotted line inside is the improvement part of system, and the region of dotted line outside is original system.
In accompanying drawing, same or analogous reference character represents same or analogous parts.
Embodiment
With reference to figure 1, Figure 1 shows that pointed by the present invention a kind of system Improving ways.Wherein, the part within dotted line is improvement part, and the part beyond dotted line is original system.
During unit starting, steamer pusher side is when this unit steam newly established switches stop valve (V1) and this unit steam switching modulating valve (V2) is closed, open high-pressure cylinder vacuum pumping valve, operation is vacuumized to high-pressure cylinder, and progressively open adjacent unit steam switching stop valve (V3) until standard-sized sheet, then progressively open adjacent unit steam and switch steam converter valve (V4).At this moment, the main steam (or reheated steam) of adjacent steam turbine is by pressing drain valve heating associated conduit before main stop valve in this unit.After before pressing main stop valve in the machine, vapor (steam) temperature reaches the machine start-up parameter, open gradually in the machine and press main stop valve and middle pressure speed governing steam valve, and carry out a series of operations such as the impulsion of this unit, raising speed, warming-up, constant speed, grid-connected, band initial load by intermediate pressure cylinder start-up program.
During unit starting, boiler side, when this unit steam newly established switches stop valve (V1) and this unit steam switching modulating valve (V2) is closed, starts igniting and the heating coil operation of carrying out this stove.First ignition of the boiler suggestion lights the superiors' burner, so that the rapid heating of superheater.After ignition of the boiler, open one-level by-pass valve and the secondary by-pass valve of this steam turbine, with main steam line and the reheaing steam pipe of this unit of steam heating of this stove.In temperature-rise period, the fastest warming velocity that will allow with boiler and pipeline increases the supply of this stove fuel, and with the fastest speed that limits by Metal Temperature lifting speed drive one-level, the secondary by-pass valve of large the machine, this stove steam is reached fast to come with adjacent unit the parameter that vapour phase is mated.
This unit initial start stage high pressure main stop valve is in closed condition, and high-pressure cylinder is in vacuum state.After the combine regulation by firsts and seconds by-pass valve makes the steam parameter before high pressure main stop valve reach high-pressure cylinder admission condition, unlatching high pressure main stop valve and speed governing steam valve make high-pressure cylinder admission and on-load.
The machine initial start stage, stop valve (V3) and adjacent unit steam switching steam converter valve (V4) is switched when progressively opening adjacent unit steam, adjacent unit carrys out vapour after the machine steam supply, open the unit water budget modulating valve (V5) newly established gradually, and regulate the water supply to adjacent unit by this valve, uneven to the steam caused by the machine supply steam to balance adjacent unit.
After this stove reheated steam parameter reaches requirement, open this unit steam newly established and switch stop valve (V1), progressively turn down the one-level of the machine, secondary by-pass valve, progressively open this unit steam simultaneously and switch modulating valve (V2), making this stove and adjacent stove group is jointly the machine steam supply, period, regulate firsts and seconds by-pass valve, make it turn down gradually until close.Along with the increase of this stove fuel supply, progressively improve this stove institute on-load.When this stove load is brought up to a certain degree (about about 50%), progressively turn down adjacent unit steam and switch steam converter valve (V4) until Close All, finally close adjacent unit steam and switch stop valve (V3), the machine starts end fast.
In addition, application area of the present invention is not limited to the technique of the specific embodiment described in specification, mechanism, manufacture, material composition, means, method and step.From disclosure of the present invention, to easily understand as those of ordinary skill in the art, for the technique existed at present or be about to develop, mechanism, manufacture, material composition, means, method or step later, wherein their perform the identical function of the corresponding embodiment cardinal principle that describes with the present invention or obtain the identical result of cardinal principle, can apply according to the present invention to them.Therefore, claims of the present invention are intended to these technique, mechanism, manufacture, material composition, means, method or step to be included in its protection domain.
Claims (9)
1. the intermediate pressure cylinder quick start system of a thermal power generation monoblock, for the unit adopting Start-up Mode for Intermediate Pressure, the boiler circuit of this system to coal-fired (firepower) power station elementary generator group is improved, and wherein, the improvement part of described system comprises:
Reheated steam switched system;
Unit water budget regulating system;
Wherein, reheated steam switched system is positioned at the outlet of this unit reheater and adjacent unit main steam (or reheated steam) pipeline, and presses in this unit between main stop valve; Unit water budget regulating system is between this unit condensate line and the condensate system of adjacent unit.
2. system according to claim 1, wherein, described reheated steam switched system comprises: this unit steam switches stop valve (V1), this unit steam switches modulating valve (V2), adjacent unit steam switches stop valve (V3), adjacent unit steam switches steam converter valve (V4), this unit reheated steam pipeline (P1) and adjacent unit supply air line (P2).
3. system according to claim 2, wherein, described unit steam switches stop valve (V1) and this unit steam switching modulating valve (V2) series connection access the machine group reheated steam pipeline (P1), in order, this unit steam switches stop valve (V1) and is positioned at this unit steam switching modulating valve (V2) upstream.
4. system according to claim 2, wherein, described adjacent unit steam switches stop valve (V3) and adjacent unit steam switches the adjacent unit steam supply pipeline (P2) of steam converter valve (V4) series connection access, the outlet conduit that the steam of adjacent unit switches modulating valve (V4) be connected in this unit press main stop valve upstream pipeline on, in order, adjacent unit steam switches stop valve (V3) and is positioned at adjacent unit steam switching steam converter valve (V4) upstream.
5. the system according to claim 2-4 any one, wherein, described unit reheated steam pipeline (P1) is original pipeline.
6. the system according to claim 2-4 any one, wherein, described adjacent unit supply air line (P2) is newly-increased pipeline, is attracted, be connected in this unit and press between main stop valve and this unit steam switching modulating valve (V2) by the main steam of adjacent unit or reheated steam pipeline.
7. system according to claim 1, wherein, described unit water budget regulating system comprises: unit water budget modulating valve (V5) and go adjacent unit condensate line (P3).
8. system according to claim 7, wherein, described unit water budget modulating valve (V5) is arranged on adjacent unit condensate line (P3).
9. the system according to claim 7-8 any one, wherein, described in go adjacent unit condensate line (P3) for newly-increased pipeline, drawn by this unit condensate line, be connected to adjacent unit condensate system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510177456.XA CN104775858A (en) | 2015-04-15 | 2015-04-15 | Intermediate-pressure cylinder rapid starting system for thermal power generation unit set |
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| CN201510177456.XA CN104775858A (en) | 2015-04-15 | 2015-04-15 | Intermediate-pressure cylinder rapid starting system for thermal power generation unit set |
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| CN201510177456.XA Pending CN104775858A (en) | 2015-04-15 | 2015-04-15 | Intermediate-pressure cylinder rapid starting system for thermal power generation unit set |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402124A (en) * | 2017-07-20 | 2017-11-28 | 中广核工程有限公司 | A kind of nuclear power plant's Steam Turhine Adjustment valve group periodic test method and apparatus |
| CN112814752A (en) * | 2021-01-08 | 2021-05-18 | 西安热工研究院有限公司 | Rapid starting system and method for thermal generator set in medium pressure cylinder starting mode |
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| JPS58155207A (en) * | 1982-03-11 | 1983-09-14 | Toshiba Corp | Method of starting steam turbine |
| US4651532A (en) * | 1985-04-12 | 1987-03-24 | Hitachi, Ltd. | Method of warming up a reheat turbine |
| CN87101723A (en) * | 1986-03-07 | 1987-09-30 | 株式会社日立制作所 | The method of starting thermal electric power plant |
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| CN204591373U (en) * | 2015-04-15 | 2015-08-26 | 钱诚 | A kind of intermediate pressure cylinder quick start system of thermal power generation monoblock |
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2015
- 2015-04-15 CN CN201510177456.XA patent/CN104775858A/en active Pending
Patent Citations (6)
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| JPS58155207A (en) * | 1982-03-11 | 1983-09-14 | Toshiba Corp | Method of starting steam turbine |
| US4651532A (en) * | 1985-04-12 | 1987-03-24 | Hitachi, Ltd. | Method of warming up a reheat turbine |
| CN87101723A (en) * | 1986-03-07 | 1987-09-30 | 株式会社日立制作所 | The method of starting thermal electric power plant |
| CN201747414U (en) * | 2010-05-31 | 2011-02-16 | 中煤能源黑龙江煤化工有限公司 | Steam source device of extraction steam turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402124A (en) * | 2017-07-20 | 2017-11-28 | 中广核工程有限公司 | A kind of nuclear power plant's Steam Turhine Adjustment valve group periodic test method and apparatus |
| CN112814752A (en) * | 2021-01-08 | 2021-05-18 | 西安热工研究院有限公司 | Rapid starting system and method for thermal generator set in medium pressure cylinder starting mode |
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Application publication date: 20150715 |