CN109736905A - Combine cooling system between steam turbine multistage cylinder - Google Patents
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- CN109736905A CN109736905A CN201910218474.6A CN201910218474A CN109736905A CN 109736905 A CN109736905 A CN 109736905A CN 201910218474 A CN201910218474 A CN 201910218474A CN 109736905 A CN109736905 A CN 109736905A
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- 238000001816 cooling Methods 0.000 title claims abstract description 86
- 239000012530 fluid Substances 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000112 cooling gas Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
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Abstract
The present invention relates to steam turbine cooling technology fields, more particularly to combine cooling system between a kind of steam turbine multistage cylinder, including preceding rotor, preceding cylinder, rear rotor and exhaust casing, it is external that preceding cylinder is set in forward, the first region to be cooled is formed between preceding cylinder and preceding rotor, preceding cylinder is equipped with the duct that cooling steam is introduced into the first region to be cooled；Exhaust casing is set in rear rotor exterior, and the second region to be cooled is formed between exhaust casing and rear rotor, and the second region to be cooled is connected by pipeline with the first region to be cooled, is introduced the steam exhaust in the first region to be cooled in second region to be cooled by pipeline.Steam exhaust after the completion of the cooling steam cooling cycle of preceding cylinder is recycled, it is used to cool down the second region to be cooled of exhaust casing as cooling steam, it is the effective means of steam exhaust energy cascade utilization, it can avoid the loss of exhaust casing through-current capability, while cold shock being avoided to cause life damage to exhaust casing and rear rotor.
Description
Technical field
The present invention relates to combine cooling system between steam turbine cooling technology field more particularly to a kind of steam turbine multistage cylinder
System.
Background technique
Cooling technology is widely used in high temperature, high steam environment tubine cylinder and rotor design.With single flow arrangement
For, as depicted in figs. 1 and 2, to balance through-flow grade axial thrust, design has the higher dummy piston 10 of diameter on rotor 1,
Dummy piston 10 is located at the side of flow area 3 in cylinder 1, and 10 region rotor disk of dummy piston is by into vapour high temperature and turning
The adverse circumstances of sub- centrifugal force act on, it usually needs are cooled down by cooling system, i.e., between dummy piston 10 and cylinder 1
Form region 4 to be cooled.In the prior art, cooling to steam using the cooling steam for being passed through high pressure low temperature into the region 4 to be cooled
Vapour can forward flow in region 4 to be cooled under the action of height pressure difference, thus cool down to it, so that the region
Creep life meets design requirement.
There are external drainage and inner draft two ways in the source of the cooling steam.As shown by the arrows in Figure 1, outside is drawn
Stream is to be introduced cooling steam in the region to be cooled 4 of this cylinder 2 by external pipe, and the source of cooling steam can be boiler
The steam of suitable parameters, also or is preceding cylinder between the steam discharge or the through-flow grade of this cylinder of the heating preceding cylinder of steam
The mixed ginseng steam of both steam between steam discharge and the through-flow grade of this cylinder.As shown by the arrows in Figure 2, inner draft is then in cylinder 2
Duct is opened up, from the region to be cooled 4 that suitable Low Temperature Steam is introduced to this cylinder 2 between the through-flow grade of this cylinder 2 by duct
It is interior.
The above-mentioned type of cooling has the following deficiencies: that extracting steam as cooling steam from preceding cylinder steam discharge is easy to be cooled
Region 4 forms cold shock, causes life damage to cylinder 2 and rotor 1.From extraction steam conduct in flow area 3 in this cylinder 2
Cooling steam will lead to the loss of 2 through-current capability of this cylinder.
Summary of the invention
The technical problem to be solved in the present invention is to provide cooling system is combined between a kind of steam turbine multistage cylinder, can be avoided
High-quality steam waste, while cold shock being avoided to cause life damage to cylinder and rotor, to overcome the above-mentioned of the prior art to lack
It falls into.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme: combining between a kind of steam turbine multistage cylinder
Cooling system, including preceding rotor, preceding cylinder, rear rotor and exhaust casing, preceding cylinder are set in forward outside, preceding cylinder and forward
The first region to be cooled is formed between son, preceding cylinder is equipped with the duct that cooling steam is introduced into the first region to be cooled；Afterwards
Cylinder is set in rear rotor exterior, and the second region to be cooled is formed between exhaust casing and rear rotor, and the second region to be cooled is logical
Piping is connected with the first region to be cooled, and the steam exhaust in the first region to be cooled is introduced the second region to be cooled by pipeline
It is interior.
Preferably, pipeline is equipped with non-return valve.
Preferably, pipeline is equipped with throttling set.
Preferably, duct extends in preceding cylinder internal and is connected with the through-flow grade of preceding cylinder.
Preferably, duct is connected through preceding cylinder and with outer pipeline, by conveying cooling steam in outer tube road direction duct.
Preferably, outer tube road is equipped with non-return valve.
Preferably, outer tube road is equipped with throttling set.
Preferably, preceding cylinder is in single flow arrangement.
Preferably, exhaust casing is in single flow arrangement or double fluid arrangement.
Preferably, preceding rotor is equipped with dummy piston, and the first region to be cooled is between dummy piston and preceding cylinder.
Compared with prior art, the present invention has significant progress:
Combine cooling system between steam turbine multistage cylinder of the invention, the region to be cooled of the second of exhaust casing by pipeline with
The region to be cooled of the first of preceding cylinder is connected, and the steam exhaust in the first region to be cooled is introduced the second area to be cooled by pipeline
In domain, i.e., the steam exhaust after the completion of the cooling steam cooling cycle in preceding cylinder first region to be cooled is recycled, as
Cooling steam is used to cool down the second region to be cooled of exhaust casing, due to the cooling steaming drawn from preceding cylinder first region to be cooled
Vapour steam exhaust is not involved in the acting of the same level cylinder, is steam exhaust energy compared with tradition is from cylinder internal or the suitable cooling gas resources of external demand
The effective means of source cascade utilization is compared and extracts cooling steam of the steam as exhaust casing, energy between through-flow grade inside exhaust casing
It is enough effectively to avoid the loss of exhaust casing through-current capability and the waste of high-quality steam, energy is saved for system, improves economy；Phase
Cooling steam of the steam as exhaust casing is directly extracted compared with from preceding cylinder steam discharge, is drawn from preceding cylinder first region to be cooled cold
But therefore steam and the temperature difference in the region to be cooled of exhaust casing second are more closely, effectively can avoid cold shock to exhaust casing
Life damage is caused with rear rotor.
Detailed description of the invention
Fig. 1 is the schematic diagram that steam turbine cooling system uses external drainage way in the prior art.
Fig. 2 is the schematic diagram that steam turbine cooling system uses inner draft mode in the prior art.
Fig. 3 is joint a kind of schematic diagram of embodiment of cooling system between steam turbine multistage cylinder of the present invention.
Fig. 4 is the schematic diagram of joint cooling system another embodiment between steam turbine multistage cylinder of the present invention.
Wherein, the reference numerals are as follows:
1, rotor 10, dummy piston
2, cylinder 3, flow area
4, region 11 to be cooled, preceding rotor
110, the dummy piston 12 of preceding rotor, rear rotor
21, preceding cylinder 22, exhaust casing
31, the flow area 41, the first region to be cooled of preceding cylinder
42, the second region to be cooled
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.These embodiments are only used for
Illustrate the present invention, and not limitation of the present invention.
In the description of the present invention, it should be noted that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
In addition, in the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.
As shown in Figure 3 and Figure 4, a kind of embodiment of cooling system is combined between steam turbine multistage cylinder of the invention.
Combining cooling system between the steam turbine multistage cylinder of the present embodiment includes: preceding rotor 11, preceding cylinder 21, rear rotor 12
With exhaust casing 22.Wherein, before preceding cylinder 21 is set in outside rotor 11, preceding rotor 11 can be rotated about axis.Preceding cylinder 21 is with before
The first region 41 to be cooled in need for carrying out cooling treatment is formed between rotor 11, preceding cylinder 21 is equipped with to the first area to be cooled
The duct that cooling steam is introduced in domain 41 is passed through the cooling of high pressure low temperature into the first region 41 to be cooled by the duct and steamed
Vapour, can at first region 41 to be cooled preceding cylinder 21 and preceding rotor 11 cool down.Exhaust casing 22 turns after being set in
Outside son 12, rear rotor 12 can be rotated about axis.Progress cooling treatment in need is formed between exhaust casing 22 and rear rotor 12
It second region 42 to be cooled can be to second area to be cooled by being passed through cooling steam into second region 42 to be cooled
Exhaust casing 22 and rear rotor 12 at domain 42 are cooled down.In the present embodiment, the second region 42 to be cooled passes through pipeline and first
Region 41 to be cooled is connected, and is introduced the steam exhaust in the first region 41 to be cooled in second region 42 to be cooled by pipeline, i.e.,
Pipeline is used to extract the steam exhaust of cooling steam in the first region 41 to be cooled, and the second region to be cooled is sent into the steam exhaust of extraction
In 42, the second region 42 to be cooled is cooled down using the steam exhaust.It as a result, will be in preceding cylinder 21 first region 41 to be cooled
Cooling steam cooling cycle after the completion of steam exhaust recycle, as cooling steam be used to cool down the second of exhaust casing 22 to
Cooled region 42 is done since the cooling steam steam exhaust drawn from preceding cylinder 21 first region 41 to be cooled is not involved in the same level cylinder
Function is the effective means of steam exhaust energy cascade utilization, phase compared with tradition is from cylinder internal or the suitable cooling gas resources of external demand
Cooling steam of the steam as exhaust casing 22 is extracted compared between the 22 through-flow grade in inside of exhaust casing, can effectively avoid exhaust casing 22 logical
The loss of stream ability and the waste of high-quality steam save energy for system, improve economy；It compares straight from preceding 21 steam discharge of cylinder
The cooling steam for extracting steam as exhaust casing 22 is connect, the cooling steam steam exhaust drawn from preceding cylinder 21 first region 41 to be cooled
With the temperature difference in the region 42 to be cooled of exhaust casing 22 second more closely, therefore can effectively avoid cold shock to exhaust casing 22 and after
Rotor 12 causes life damage.
It preferably, can be in the connection region 42 to be cooled of exhaust casing 22 second and preceding cylinder 21 first region 41 to be cooled
Non-return valve is set on pipeline.It by non-return valve, on the one hand can prevent steam from flowing backwards, effectively avoid in the second region 42 to be cooled
High-temperature steam under variation, exception or extreme operating condition by pipeline reverse flow flow backward enter the first region 41 to be cooled, prevent
Only thus preceding cylinder 21 generates unnecessary deformation, guarantees steam turbine life-span design；On the other hand, the presence of non-return valve makes cold
But the design of pressure difference can rationally reduce before and after system, be conducive to introduce the cooling steam steam exhaust in the first region 41 to be cooled the
In two regions 42 to be cooled.
It preferably, can be in the connection region 42 to be cooled of exhaust casing 22 second and preceding cylinder 21 first region 41 to be cooled
Throttling set is set on pipeline, and throttling set can be set in the downstream of non-return valve, for adjusting the cooling steam of pipeline introducing
The flow of steam exhaust, and matching pressure realize the reasonable utilization of cooling steam steam exhaust.Preferably, the throttling set on pipeline can be with
For throttle valve.
In the present embodiment, the mode that preceding cylinder 21 introduces cooling steam into the first region 41 to be cooled can be using inside
The mode of drainage or the mode of external drainage.
When preceding cylinder 21 is by the way of inner draft, the duct of preceding cylinder 21 preceding 21 internal stretch of cylinder and with preceding vapour
The through-flow grade of cylinder 21 is connected, and the through-flow grade is located in the flow area 31 of preceding cylinder 21, and the steam parameter of the through-flow grade
Match with cooling steam parameter needed for preceding cylinder 21 first region 41 to be cooled.It as a result, can be by preceding cylinder by duct
First region 41 to be cooled of cylinder 21 before suitable Low Temperature Steam is introduced as cooling steam between the 21 through-flow grades in inside, to first
Preceding cylinder 21 and preceding rotor 11 at region 41 to be cooled are cooled down.
When preceding cylinder 21 is by the way of the drainage of outside, the duct of preceding cylinder 21 is connected through preceding cylinder 21 and with outer pipeline
It is logical, by conveying cooling steam in outer tube road direction duct.The source of cooling steam can be boiler heating steam or preceding cylinder
The steam of suitable parameters between 21 through-flow grades.Preferably, non-return valve can be set on outer pipeline.By non-return valve, on the one hand may be used
To prevent steam from flowing backwards, effectively avoid the high-temperature steam in downstream under variation, exception or extreme operating condition by duct and exterior tube
Road reverse flow, which is flowed backward, enters low-temperature region, and before preventing thus cylinder 21 generates unnecessary deformation, guarantees that steam turbine life-span is set
Meter；On the other hand, the presence of non-return valve reduces the design of cooling system front and back pressure difference rationally, high-pressure side cooling steam
The lower steam of pressure stage energy level may be selected, cooling gas flow can rationally reduce, thus can avoid the waste of high-quality steam,
Ability is saved for system, improves economy.Preferably, throttling set can be set on outer pipeline, and throttling set can be set
The reasonable utilization of cooling steam is realized for adjusting the flow of cooling steam, and matching pressure in the downstream of non-return valve.It is preferred that
Ground, the throttling set of outer tube road can be throttle valve.
In the present embodiment, dummy piston 110 is equipped on preceding rotor 11, the first region 41 to be cooled is located at dummy piston
Between 110 and preceding cylinder 21.That is, the first region 41 to be cooled can be the high-temperature area at preceding 21 dummy piston 110 of cylinder, then
The present embodiment is the steam exhaust that cooling steam is drawn after preceding 21 dummy piston 110 of cylinder, for cool down the second of exhaust casing 22 to
Cooled region 42.Certainly, the high-temperature area before the first region 41 to be cooled is not limited at 21 dummy piston 110 of cylinder.Afterwards
42 position of region to be cooled of the second of cylinder 22 is not also limited to, and should need to carry out in exhaust casing 22 determines according to actual conditions
Cooling high-temperature area, the as second region 42 to be cooled.
In the present embodiment, it is preferable that preceding cylinder 21 is in single flow arrangement.Exhaust casing 22 does not limit to then, referring to Fig. 3, in one kind
In embodiment, exhaust casing 22 can be in single flow arrangement；Referring to fig. 4, in another embodiment, exhaust casing 22 can be in double
Flow arrangement.
Combine cooling system between the steam turbine multistage cylinder of the present embodiment in design, can be carried out by following steps:
Step 1, the power based on steam turbine, into steam discharge parameter etc., the arrangement form of cylinder 21 and exhaust casing 22 before determining:
Preceding cylinder 21 is single flow arrangement, and exhaust casing 22 is single flow arrangement or double fluid arrangement.
Step 2 is based on main steam condition, through-flow series, blade dimensions etc. in preceding cylinder 21, the through-flow grade of cylinder 21 before analyzing
After at different levels, after dummy piston 110, the temperature and pressure of steam discharge region steam, analyze the area to be cooled of cylinder 21 first before simultaneously determining
Cooling steam parameter needed for domain 41 (at dummy piston 110) is cooling, choosing suitable incorporation way, (inner draft or outside are drawn
Stream) and cooling steam source.
Step 3, based on main steam condition, through-flow series, blade dimensions in exhaust casing 22 etc., analysis exhaust casing 22 second to
Cooling steam parameter needed for cooled region 42.
Step 4, based on the steam exhaust parameter (temperature, pressure) after preceding 21 dummy piston 110 of cylinder, design exhaust casing 22 and introduce
Position, arrangement and the flow of the steam exhaust, and creep life examining computation is completed, meet the safe operation of steam turbine 30 and requires.
In conclusion combine cooling system between the steam turbine multistage cylinder of the present embodiment, preceding cylinder 21 first is to be cooled
Steam exhaust after the completion of cooling steam cooling cycle in region 41 recycles, as cooling steam for cooling down exhaust casing 22
The second region 42 to be cooled, realize the effective use of steam exhaust energy step, can effectively avoid 22 through-current capability of exhaust casing
Loss and high-quality steam waste, save energy for system, improve economy, while effectively cold shock can be avoided to rear
Cylinder 22 and rear rotor 12 cause life damage.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these are improved and replacement
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. combining cooling system between a kind of steam turbine multistage cylinder, which is characterized in that including preceding rotor (11), preceding cylinder (21),
Rotor (12) and exhaust casing (22) afterwards, the preceding cylinder (21) are set in preceding rotor (11) outside, the preceding cylinder (21)
The first region (41) to be cooled is formed between the preceding rotor (11), the preceding cylinder (21) is equipped with to described first to cold
But the duct of cooling steam is introduced in region (41)；The exhaust casing (22) is set in rear rotor (12) outside, after described
It is formed with the second region (42) to be cooled between cylinder (22) and the rear rotor (12), second region (42) to be cooled is logical
Piping is connected with the described first region (41) to be cooled, will be weary in the described first region (41) to be cooled by the pipeline
Vapour introduces in second region (42) to be cooled.
2. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that set on the pipeline
There is non-return valve.
3. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that set on the pipeline
There is throttling set.
4. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that the duct is in institute
It states preceding cylinder (21) internal stretch and is connected with the through-flow grade of the preceding cylinder (21).
5. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that the duct is run through
The preceding cylinder (21) is simultaneously connected with outer pipeline, conveys the cooling steam in the duct as described in the outer tube road direction.
6. combining cooling system between steam turbine multistage cylinder according to claim 5, which is characterized in that the outer tube road
Equipped with non-return valve.
7. combining cooling system between steam turbine multistage cylinder according to claim 5, which is characterized in that the outer tube road
Equipped with throttling set.
8. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that the preceding cylinder
(21) in single flow arrangement.
9. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that the exhaust casing
(22) in single flow arrangement or double fluid arrangement.
10. combining cooling system between steam turbine multistage cylinder according to claim 1, which is characterized in that the preceding rotor
(11) dummy piston (110) are equipped with, first region (41) to be cooled is located at the dummy piston (110) and the preceding vapour
Between cylinder (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910218474.6A CN109736905A (en) | 2019-03-21 | 2019-03-21 | Combine cooling system between steam turbine multistage cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910218474.6A CN109736905A (en) | 2019-03-21 | 2019-03-21 | Combine cooling system between steam turbine multistage cylinder |
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| Publication Number | Publication Date |
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| CN109736905A true CN109736905A (en) | 2019-05-10 |
Family
ID=66371092
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910218474.6A Pending CN109736905A (en) | 2019-03-21 | 2019-03-21 | Combine cooling system between steam turbine multistage cylinder |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1061457A (en) * | 1996-08-27 | 1998-03-03 | Mitsubishi Heavy Ind Ltd | Gas turbine for combined cycle power plant |
| US20100178168A1 (en) * | 2009-01-09 | 2010-07-15 | Desai Tushar S | Rotor Cooling Circuit |
| US20120328409A1 (en) * | 2011-06-23 | 2012-12-27 | General Electric Company | Systems and methods for cooling high pressure and intermediate pressure sections of a steam turbine |
| CN203531984U (en) * | 2013-10-14 | 2014-04-09 | 西安热工研究院有限公司 | Direct air-cooling unit system with plate-type evaporative condenser set |
| US20170138265A1 (en) * | 2015-11-13 | 2017-05-18 | Ansaldo Energia Switzerland AG | Heat exchangers and cooling methods for gas turbines |
| CN109162772A (en) * | 2018-11-06 | 2019-01-08 | 上海电气电站设备有限公司 | A kind of steam turbine and its internal cooling method |
| CN109184823A (en) * | 2018-11-06 | 2019-01-11 | 上海电气电站设备有限公司 | A kind of steam turbine and its operation method with filling structure |
| CN209976585U (en) * | 2019-03-21 | 2020-01-21 | 上海电气电站设备有限公司 | Combined cooling system between multistage cylinders of steam turbine |
-
2019
- 2019-03-21 CN CN201910218474.6A patent/CN109736905A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1061457A (en) * | 1996-08-27 | 1998-03-03 | Mitsubishi Heavy Ind Ltd | Gas turbine for combined cycle power plant |
| US20100178168A1 (en) * | 2009-01-09 | 2010-07-15 | Desai Tushar S | Rotor Cooling Circuit |
| US20120328409A1 (en) * | 2011-06-23 | 2012-12-27 | General Electric Company | Systems and methods for cooling high pressure and intermediate pressure sections of a steam turbine |
| CN203531984U (en) * | 2013-10-14 | 2014-04-09 | 西安热工研究院有限公司 | Direct air-cooling unit system with plate-type evaporative condenser set |
| US20170138265A1 (en) * | 2015-11-13 | 2017-05-18 | Ansaldo Energia Switzerland AG | Heat exchangers and cooling methods for gas turbines |
| CN109162772A (en) * | 2018-11-06 | 2019-01-08 | 上海电气电站设备有限公司 | A kind of steam turbine and its internal cooling method |
| CN109184823A (en) * | 2018-11-06 | 2019-01-11 | 上海电气电站设备有限公司 | A kind of steam turbine and its operation method with filling structure |
| CN209976585U (en) * | 2019-03-21 | 2020-01-21 | 上海电气电站设备有限公司 | Combined cooling system between multistage cylinders of steam turbine |
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