CN102587995A - Rotor of steam turbine for driving water feeding pump of boiler with power lower than 300MW (megawatt) and starting method of rotor - Google Patents
Rotor of steam turbine for driving water feeding pump of boiler with power lower than 300MW (megawatt) and starting method of rotor Download PDFInfo
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- CN102587995A CN102587995A CN2011100088714A CN201110008871A CN102587995A CN 102587995 A CN102587995 A CN 102587995A CN 2011100088714 A CN2011100088714 A CN 2011100088714A CN 201110008871 A CN201110008871 A CN 201110008871A CN 102587995 A CN102587995 A CN 102587995A
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Abstract
The invention discloses a rotor of a steam turbine for driving a water feeding pump of a boiler with power lower than 300WM (megawatt). The rotor comprises a steam turbine rotor, a steam seal is arranged on the rotor, and the rotor is a rigid rotor; and a gap of a half side of the steam seal ranges from 0.35mm to 0.45mm. A starting method of the rotor includes adopting cold-state start, and is characterized in that in the cold-state start, steps include a, starting the still rotor, increasing the speed of the rotor by speed rate of 5r/min so as to be equal to turbine heating rotation speed, and keeping the turbine heating rotation speed ranging from 500r to 1000r for 1 hour; b, increasing the speed of the rotor to rotation speed of 1500r by speed rate of 10r/min and keeping the rotation speed for 10 minutes; c, increasing the speed of the rotor to rotation speed of 2000r by speed rate of 10r/min and keeping the rotation speed for 10 minutes; d, increasing the speed of the rotor to rotation speed of 2500r by speed rate of 10r/min and keeping the rotation speed for 10 minutes; and e, increasing the speed of the rotor to working rotation speed by speed rate of 10r/min. The rotor of the steam turbine for driving the water feeding pump of the boiler with the power lower than 300WM and the starting method of the rotor can realize a turning-free design of the steam turbine for driving the water feeding pump of the boiler with the power lower than 300WM, and effectively avoids a series of problems caused after a turning gear is utilized.
Description
Technical field
The present invention relates to the steam turbine field, especially a kind of rotor and startup method thereof that is used to drive the steam turbine of the following boiler feed pump of 300MW.
Background technique
In recent years, constantly soaring of coal, oil price lattice heightens the thermoelectric cost of thermoelectricity plant, and profit margin is more and more littler.Thermoelectric enterprise will reach the target that reduces production costs, reduces fuel consumption and realize energy-saving and emission-reduction, must carry out some reducing energy consumptions, reduces generating, power supply and heat supply coal consumption.The reducing energy consumption approach is a lot, and a wherein effective measure is that to change electrically driven feedpump be steam feed pump.What electrically driven feedpump consumed is the generated energy (station service) of power plant; Be that main frame comes through a series of transformation of energy from coal; And steam feed pump is the heat energy that consumes steam; Be to convert main steam acting back to or do not do work through boiler by coal directly to get into the feed water pump small turbine and drag feed water pump, thereby the employing steam turbine drags feed water pump, and to drag the feed water pump energy-saving effect than motor obvious.But after adopting the alternative motor of steam turbine to drag feed water pump; Bring following problem thus: adopt motor driving not have the shutdown jiggering; And after the employing Steam Turbine Driven for guaranteeing that rotor is heated evenly; Do not produce distortion, then require to carry out jiggering, and after the steam turbine temperature is reduced to a certain degree, just allow to stop jiggering.Simultaneously, the boiler feed water pump structure has also determined steam turbine can not carry out the low speed jiggering, if need jiggering then can only adopt the high speed jiggering.Secondly, boiler feed pump is after shutdown, and internal chamber is fills with water still, if carrying out the high speed jiggering then requires the jiggering motor to have bigger power, and also that corresponding consumption is bigger electric energy when jiggering.In addition; The barring speed that feed water pump requires is again on the low side really than the minimum normal running speed that steam turbine requires; In this high speed jiggering process; Steam turbine bearing can't form stable oil film, causes the axle wearing and tearing easily, and the high speed jiggering finally causes reduce greatly the working life of steam turbine bearing.
Therefore, people hope that always steam turbine that this boiler feed pump uses can proper functioning under the situation of not using jiggering.
Summary of the invention
A kind of rotor and the startup method thereof of steam turbine that is used to drive the following boiler feed pump of 300MW of exempting from jiggering that the objective of the invention is to design for the deficiency that solves above-mentioned technology.
The present invention designed is used to drive the rotor of the steam turbine of the following boiler feed pump of 300MW, and it comprises turbine rotor, and rotor is provided with packing, and described rotor is a stiffness rotor; The half of gap of said packing is 0.35mm～0.45mm.The critical speed of rotation of stiffness rotor is higher than the steam turbine operation rotating speed; Process is to the analysis of rotor under inhomogeneous cool condition; When turbine rotor was flexible rotor, steam turbine operation process rotor bending deformation quantity was big, because of adopting jiggering a bit; And the stiffness rotor rigidity can effectively prevent rotor bow greater than flexible rotor; Described in addition labyrinth clearance suitably increases than existing technology, can effectively avoid producing at the start-up course rotor situation of the gland sealing gear grazing that forms after the thermal bending.Wherein, described packing can be front steam seal, back packing, inner gland etc.
The half of gap that preferred scheme is said packing is 0.35mm～0.40mm, is preferably 0.37mm, and such structure is more suitable for using steam turbine in the boiler feed pump of 125MW.
The startup method of the rotor of the present invention designed the above-mentioned steam turbine that is used to drive the following boiler feed pump of 300MW, it comprises the employing cold start, it is characterized in that in said cold start, carrying out as follows:
A, rotor be from static, rise to the warming-up rotating speed with the raising speed of 5r/min, and kept this warming-up rotating speed 1 hour, this warming-up rotating speed at 500r between the 1000r;
B, rise to 1500r, and kept this rotating speed 10 minutes with the raising speed of 10r/min;
C, rise to 2000r, and kept this rotating speed 10 minutes with the raising speed of 10r/min;
D, rise to 2500r, and kept this rotating speed 10 minutes with the raising speed of 10r/min;
E, rise to working speed with the raising speed of 10r/min.
Being used to of gained of the present invention drives the rotor and the startup method thereof of the steam turbine of the following boiler feed pump of 300MW; Can be under the situation of not using jiggering can proper functioning; Realized exempting from the design of jiggering, avoided boiler feed pump to adopt a series of problems that produced behind the barring gear effectively, simplified the structure of steam turbine simultaneously with steam turbine; Reduced the cost of production of unit to the greatest extent, also reduced energy consumption for the user.
Description of drawings
Fig. 1 is embodiment's 1 structural representation;
Fig. 2 is the schematic representation of embodiment's 1 sealing gland and rotor;
Fig. 3 is climb curve figure of the present invention;
Among the figure: rotor 1, packing 2, cold start curve 3, hot starting, hot start curve 4.
Embodiment
Combine accompanying drawing that the present invention is done further description through embodiment below.
Embodiment 1:
Like Fig. 1, shown in 2, present embodiment is described to be used to drive the rotor of the steam turbine of the following boiler feed pump of 300MW, and it comprises turbine rotor 1, and rotor 1 is provided with packing 2, and described rotor 1 is a stiffness rotor; The half of gap of said packing 2 is 0.35mm.
Wherein, the half of gap of said packing 2 can also be the arbitrary value between the 0.35mm to 0.45mm.
The critical speed of rotation of stiffness rotor is higher than the steam turbine operation rotating speed; Process is to the analysis of rotor 1 under inhomogeneous cool condition; When turbine rotor 1 was flexible rotor, steam turbine operation process rotor 1 bending deformation quantity was big, because of adopting jiggering a bit; And the stiffness rotor rigidity can effectively prevent rotor 1 bending greater than flexible rotor; Described in addition packing 2 gaps suitably increase than existing technology, can effectively avoid producing the situation of the packing 2 tooth grazings that form after the thermal bending at start-up course rotor 1.Wherein, described packing 2 can be front steam seal 2, back packing 2, inner gland 2 etc.
As shown in Figure 7, the startup method of the rotor of the above-mentioned steam turbine that is used to drive the following boiler feed pump of 300MW, it comprises the employing cold start, it is characterized in that in said cold start, carrying out as follows:
A, rotor 1 be from static, rise to the warming-up rotating speed with the raising speed of 5r/min, and kept this warming-up rotating speed 1 hour, this warming-up rotating speed at 500r to (like 800r) between the 1000r;
B, rise to 1500r, and keep this rotating speed 10 minutes (warming-up) with the raising speed of 10r/min;
C, rise to 2000r, and keep this rotating speed 10 minutes (warming-up) with the raising speed of 10r/min;
D, rise to 2500r, and keep this rotating speed 10 minutes (warming-up) with the raising speed of 10r/min;
E, rise to working speed with the raising speed of 10r/min, working speed can be between 4500r to 5000r, like 4600r.During hot starting, hot start, rotor 1 is from static, and raising speed that can 10r/min rises to working speed.
Save after the jiggering steam turbine safe and stable operation main following points that have a negative impact: the upper and lower inhomogeneous cooling of (1) cylinder is even, causes cylinder in shutting down cooling procedure, to produce thermal stress; (2) rotor 1 upper and lower inhomogeneous cooling is even, causes rotor 1 to produce thermal bending; (3) rotor 1 may produce packing 2 tooth grazing situation after will producing thermal bending and producing thermal bending in start-up course; (4) can thermal bending in time be eliminated after operation a period of time; (5) thermal bending that produces may cause steam turbine vibration values in starting boosting velocity procedure to exceed standard.
To above-mentioned (1) bar: because of driving the throttle (steam) temperature lower (≤400 ℃) of the following boiler feed pump of 300MW with steam turbine, through simulation analysis, the even thermal stress of cylinder generation that causes of the upper and lower inhomogeneous cooling of cylinder is less, also is not enough to cause cylinder deformation.
To above-mentioned (2), (3) bar: through simulation analysis; Rotor 1 can produce certain thermal bending, for avoiding producing in the caused dynamic and static body grazing situation of start-up course after the thermal bending, must suitably increase packing 2 backlashes; After through packing 2 gas leakage analyze; Because of drive the following boiler feed pump of 300MW with the initial steam pressure of steam turbine lower (≤2.0Mpa),, can not exert an influence to the internal efficiency of steam turbine so suitably increase the increase that packing 2 backlashes can not cause Steam loss.
To above-mentioned (4), (5) bar: through multiple rotor structure is carried out simulation analysis, draw as drawing a conclusion: if rotor 1 is flexible rotor, then this problem can not solve, and in shutting down cooling procedure, necessarily requires jiggering; If but rotor 1 is a stiffness rotor, and rigidity acquires a certain degree, just then thermal bending can in time eliminated under the warm-up period fully, and vibration values also can reach respective standard in start-up course.Therefore, employing is exempted from jigger rotor 1 design and is necessarily required rotor 1 to be stiffness rotor, and requires rigidity enough good.
In sum; The resulting driving boiler feed pump of the present invention adopts with steam turbine and exempts from the barring structure design; Avoided boiler feed pump to adopt a series of problems that produced behind the barring gear with steam turbine effectively; Simplified the structure of steam turbine simultaneously, reduced the cost of production of unit to the greatest extent, also reduced energy consumption for the user.
Present embodiment is described to be used to drive the rotor of the steam turbine of the following boiler feed pump of 300MW; Can be under the situation of not using jiggering can proper functioning; Realized exempting from the design of jiggering, avoided boiler feed pump to adopt a series of problems that produced behind the barring gear effectively, simplified the structure of steam turbine simultaneously with steam turbine; Reduced the cost of production of unit to the greatest extent, also reduced energy consumption for the user.
Embodiment 2:
Present embodiment is described to be used to drive the rotor of the steam turbine of 125MW boiler feed pump, and it comprises turbine rotor 1, and rotor 1 is provided with packing 2, and described rotor 1 is a stiffness rotor; The half of gap of said packing 2 is 0.35mm, also can be for arbitrary value between 0.35mm～0.40mm, and like 0.37mm, other are with embodiment 1.
The startup method of the rotor of the above-mentioned steam turbine that is used to drive the 125MW boiler feed pump, it comprises the employing cold start, it is characterized in that in said cold start, carrying out as follows:
A, rotor 1 be from static, rise to the warming-up rotating speed with the raising speed of 5r/min, and kept this warming-up rotating speed 1 hour, this warming-up rotating speed at 500r to (like 800r) between the 1000r;
B, rise to 1500r, and keep this rotating speed 10 minutes (warming-up) with the raising speed of 10r/min;
C, rise to 2000r, and keep this rotating speed 10 minutes (warming-up) with the raising speed of 10r/min;
D, rise to 2500r, and keep this rotating speed 10 minutes (warming-up) with the raising speed of 10r/min;
E, rise to working speed with the raising speed of 10r/min, working speed can be between 4500r to 5000r, like 4600r.During hot starting, hot start, rotor 1 is from static, and raising speed that can 10r/min rises to working speed.
Vibration and rotating speed that rotor 1 produces thermal bending have direct relation; So rotor 1 produces bending deflection through uneven cooling back; Vibration becomes big in the time of will certainly causing rotor 1 to be started shooting once more; But this bending deflection because of rotor 1 is not plastic deformation, under the condition of high temperature, can reply again to be original unbending state.Adopt above-mentioned cold start method, the vibration of rotor 1 can not exceed standard, in the boosting velocity procedure, exist warm-up period that rotor 1 thermal bending is disappeared after, rotating speed again raises.
Present embodiment is to design this generating unit speed 4640r/min, power 3000kW, initial steam pressure 0.88Mpa (a), 350 ℃ of throttle (steam) temperatures to driving the jigger rotor 1 of exempting from of 125MW boiler feed pump with steam turbine; Exempt from the jiggering design for this machine group rotor 1 can be adopted, at first rotor 1 scheme has been carried out rotor 1 mechanical model modeling, then rotor 1 model is carried out a series of vibration modal analysis; Through the bending vibation mode picture analysis, produce under the situation of various amount of unbalance at this rotor 1, the vibration coefficient is all very little; Rotor 1 rigidity is enough, even rotor 1 inhomogeneous cooling in cooling procedure is even, it also is minimum producing thermal bending; In start-up course, rotating speed is lower than under the prerequisite of certain value, and vibration can not exceed standard; And under the condition of low speed warming time proper extension, in time rotor 1 is eliminated thermal bending.Through simulation analysis, draw the climb curve figure of this rotor 1, like Fig. 3,, just can make the operating point that reaches of rotor 1 safety and stability as long as control rotor 1 raising speed according to climb curve figure.
The driving 125MW boiler feed pump that present embodiment is described adopts with turbine rotor 1 and exempts from the jiggering design, through the use of actual items, has proved the safe and reasonable property of this design.Turbine rotor 1 exempt from jiggering design, solved effectively and driven boiler feed pump with a series of problems that steam turbine requirement jiggering is produced, both simplified set structure, reduced cost of production, reduced energy consumption for the user again.
Claims (4)
1. rotor that is used to drive the steam turbine of the following boiler feed pump of 300MW, it comprises turbine rotor, rotor is provided with packing, it is characterized in that described rotor is a stiffness rotor; The half of gap of said packing is 0.35mm～0.45mm.
2. the rotor that is used to drive the steam turbine of the following boiler feed pump of 300MW according to claim 1, the half of gap that it is characterized in that said packing is 0.35mm～0.40mm.
3. the rotor that is used to drive the steam turbine of the following boiler feed pump of 300MW according to claim 2, the half of gap that it is characterized in that said packing is 0.37mm.
4. the startup method of the rotor of a steam turbine that is used to drive the following boiler feed pump of 300MW as claimed in claim 1, it comprises the employing cold start, it is characterized in that in said cold start, carrying out as follows:
A, rotor be from static, rise to the warming-up rotating speed with the raising speed of 5r/min, and kept this warming-up rotating speed 1 hour, this warming-up rotating speed at 500r between the 1000r;
B, rise to 1500r, and kept this rotating speed 10 minutes with the raising speed of 10r/min;
C, rise to 2000r, and kept this rotating speed 10 minutes with the raising speed of 10r/min;
D, rise to 2500r, and kept this rotating speed 10 minutes with the raising speed of 10r/min;
E, rise to working speed with the raising speed of 10r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100088714A CN102587995A (en) | 2011-01-17 | 2011-01-17 | Rotor of steam turbine for driving water feeding pump of boiler with power lower than 300MW (megawatt) and starting method of rotor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100088714A CN102587995A (en) | 2011-01-17 | 2011-01-17 | Rotor of steam turbine for driving water feeding pump of boiler with power lower than 300MW (megawatt) and starting method of rotor |
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| Publication Number | Publication Date |
|---|---|
| CN102587995A true CN102587995A (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100088714A Pending CN102587995A (en) | 2011-01-17 | 2011-01-17 | Rotor of steam turbine for driving water feeding pump of boiler with power lower than 300MW (megawatt) and starting method of rotor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356675A (en) * | 2018-12-13 | 2019-02-19 | 浙江医药高等专科学校 | Feed pump turbine automatic starting control method |
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| JPH08334005A (en) * | 1995-06-06 | 1996-12-17 | Toshiba Corp | Turbine starting control device |
| CN2596017Y (en) * | 2003-01-23 | 2003-12-31 | 赵堂宽 | Gland sealing device of steam turbine |
| JP2005291083A (en) * | 2004-03-31 | 2005-10-20 | Toshiba Plant Systems & Services Corp | Turbine acceleration indication manual start-up device and manual start-up method |
| CN2802091Y (en) * | 2005-04-29 | 2006-08-02 | 李龙江 | Adjustable gland sealing ring |
| CN2888079Y (en) * | 2005-12-28 | 2007-04-11 | 宋鹏 | Adjustable damping sealing gland |
| CN202001066U (en) * | 2011-01-17 | 2011-10-05 | 杭州中能汽轮动力有限公司 | Rotor of steam turbine for driving boiler water feeding pump of below 300MW |
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2011
- 2011-01-17 CN CN2011100088714A patent/CN102587995A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08334005A (en) * | 1995-06-06 | 1996-12-17 | Toshiba Corp | Turbine starting control device |
| CN2596017Y (en) * | 2003-01-23 | 2003-12-31 | 赵堂宽 | Gland sealing device of steam turbine |
| JP2005291083A (en) * | 2004-03-31 | 2005-10-20 | Toshiba Plant Systems & Services Corp | Turbine acceleration indication manual start-up device and manual start-up method |
| CN2802091Y (en) * | 2005-04-29 | 2006-08-02 | 李龙江 | Adjustable gland sealing ring |
| CN2888079Y (en) * | 2005-12-28 | 2007-04-11 | 宋鹏 | Adjustable damping sealing gland |
| CN202001066U (en) * | 2011-01-17 | 2011-10-05 | 杭州中能汽轮动力有限公司 | Rotor of steam turbine for driving boiler water feeding pump of below 300MW |
Non-Patent Citations (4)
| Title |
|---|
| 常桂莲: "《汽轮机 上册》", 31 October 2000, 中国电力出版社 * |
| 范斌: "国产300MW汽轮机中压缸启动的试验研究与应用", 《华北电力大学硕士学位论文》 * |
| 褚伟: "布莱登汽封在300MW汽轮机上的应用研究", 《中国优秀硕士学位论文全文数据库工程科技I辑》 * |
| 陈锋: "国产200MW汽轮机冷态启动的研究", 《重庆大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109356675A (en) * | 2018-12-13 | 2019-02-19 | 浙江医药高等专科学校 | Feed pump turbine automatic starting control method |
| CN109356675B (en) * | 2018-12-13 | 2021-10-22 | 浙江医药高等专科学校 | Automatic starting control method for water feeding pump steam turbine |
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Application publication date: 20120718 |