CN104088677B - Steam reheater in a kind of machine of multistage impulse turbine - Google Patents
Steam reheater in a kind of machine of multistage impulse turbine Download PDFInfo
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- CN104088677B CN104088677B CN201410290181.6A CN201410290181A CN104088677B CN 104088677 B CN104088677 B CN 104088677B CN 201410290181 A CN201410290181 A CN 201410290181A CN 104088677 B CN104088677 B CN 104088677B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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Abstract
The present invention be a kind of multistage impulse turbine machine in steam reheater, belong to multistage impulse turbine field, be specifically related to a kind of steam reheater saturated vapour being carried out to dehumidifying and reheating in machine, be included between stage and one or several steam reheaters are set, the steam inlet of this steam reheater is connected by the steam drawing-off mouth of steam inducing tube with on front side of its previous stage or front some grades of front sides, steam reheater comprises upper semi-circle reheater and lower semi-circle reheater, wherein arrange, lower semi-circle heating pipe group, reheater is by upper, lower collecting box is communicated with, upper, the upper and lower correspondence in junction surface place of lower collecting box arranges the some apertures passed through for steam and condensed water, the invention solves the structure of the annular reheater of existing left and right subdivision and the inconsistent problem of typical structure of steam turbine, the steam reheater of the structure of subdivision up and down proposed makes full use of space in steam turbine and uses prime to draw gas as reheater thermal source, thus improve reheater ability to work, improve the performance of saturated steam turbine.
Description
Technical field
The invention belongs to multistage impulse turbine field, be specifically related to a kind of steam reheater saturated vapour being carried out to dehumidifying and reheating in machine.
Background technique
In industrial processes, the saturated vapour that often meeting by-product is a large amount of.Saturated vapour can not be directly used in generating, otherwise the water erosion of last stage vane of steam turbine can be caused to destroy.For preventing turbine blade generation water erosion accident, a most effective method carries out reheating to steam, reduces the humidity of steam.The reheating of steam can be carried out in the boiler, also can carry out in reheater.Reheater can be placed on outside steam turbine, also can be placed on the cylinder interior of steam turbine.
Chinese invention patent " multistage impulse turbine of the reheating that dehumidifies in machine " (ZL200510034193.3) discloses inter-stage steam reheater in the machine in a kind of steam turbine, and this reheater is made up of left and right two semi-ring.This reheater uses the initial steam of drawing from main steam pipe as the thermal source of reheater, expansion work step-down cooling is become wet main flow steam heating and becomes dry saturated vapor, but due to the basic structure pattern of steam turbine be upper and lower subdivision.Therefore there is following problem:
The first, because left and right half reheater is semicircular configuration, lower end also has fitting seat, as the reaping hook that a hilt is downward, can only to be played the circular arc passage moved in parallel through being made up of lower cylinder and rotor by crane.The width of the curved channel that lower cylinder and rotor are formed significantly will must be less than by the width of this passage then reheater ring.This means that the annulus flow area of reheater can only be significantly smaller than the utilized area in cylinder, estimate the utilized area that can only utilize 30%.This is by too high for the steam flow rate resulting through reheater, and resistance is excessive, thus reduces the internal efficiency of steam turbine.The power of unit is larger, and this shortcoming is more obvious.
The second, reheater flow area reduces the reduction that also result in heat exchange area in unit length.In order to make reheater have enough heat exchange areas, can only increase the length of reheater, this will cause whole steam turbine length to increase on the one hand, and cost increases, and the gas-flow resistance of reheater also will be increased further what is worse, and steam turbine internal efficiency declines further.
Three, because heat exchange area is inadequate, this invention has to directly to use initial steam on main steam pipe as reheating thermal source, to improve heat transfer temperature difference, which results in the waste of steam grade, reduces overall generating efficiency.
Summary of the invention
The present invention is directed to steam reheater in machine that shortcoming dehumidifying reheat machine structure existed in above-mentioned steam turbine machine proposes a kind of multistage impulse turbine of upper and lower subdivision, concrete technological scheme is as follows:
Steam reheater in a kind of machine of multistage impulse turbine, be included between stage and arrange one or several steam reheaters, the steam inlet of this steam reheater is connected by the steam drawing-off mouth of steam inducing tube with on front side of its previous stage or front some grades of front sides.
Particularly, in described machine, steam reheater comprises the upper semi-circle reheater and lower semi-circle reheater that surround turbine spindle, and the junction surface of upper and lower semicircle reheater is on the horizontal plane by steam turbine center line; Upper semi-circle reheater comprises upper semi-circle frame, upper semi-circle inner housing, upper semi-circle heating pipe group between the inside and outside housing of described upper semi-circle, the end that is positioned at described junction surface place and the inside and outside housing of upper semi-circle and upper semi-circle heating pipe group are connected upper left header, upper right header; Lower semi-circle reheater comprises lower semi-circle frame, lower semi-circle inner housing, lower semi-circle heating pipe group between the inside and outside housing of described lower semi-circle, bottom left header, bottom right header that the end being positioned at described junction surface place and the inside and outside housing of lower semi-circle and lower semi-circle heating pipe group is connected; Described upper and lower semicircle heating pipe group is communicated with described upper left, upper right, bottom left, bottom right header; Be provided with fitting seat bottom described lower semi-circle frame, reheater is fixed on the mounting plate of cylinder under steam turbine by fitting seat, described fitting seat is provided with towards the steam intake outside cylinder and condensed water discharge outlet.The upper and lower both ends of the surface of semicircle frame of described steam reheater and the bi-side of the mounting groove of steam turbine are sliding connection, and the exit end face of described upper and lower semicircle inner housing is connected with the baffle contacts of next stage adjacent.
Further, the joint of described upper right header and the joint of bottom right header, upper left header and bottom left header is arranged on the header side adjacent with cylinder wall, the some apertures passed through for steam and condensed water are set in the joint correspondence of described upper right header and the joint of bottom right header, upper left header and bottom left header, sealing flange is set around aperture; Arrange the through hole of some bolts at the connection part of described upper right header, the connection part of upper left header, arrange some inner bolt holes in the connection part of bottom right header, the connection part correspondence of bottom left header, upper and lower half header is bolted to connection.
The heating pipe of described upper semi-circle and lower semi-circle heating pipe group is the length of oval pipe, described ellipse
Axle is parallel with the direction of main steam stream in steam turbine.Described oval pipe arranges fin.
The invention solves the structure of the annular reheater of existing left and right subdivision and the inconsistent problem of typical structure of steam turbine, the reheater structure of the subdivision up and down proposed makes full use of space in steam turbine and uses prime to draw gas as reheater thermal source, not only simplify the mounting process of reheater, achieve energy-saving and cost-reducing, and improve reheater ability to work, improve the performance of saturated steam turbine, be therefore specially adapted to large steam turbine.
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Accompanying drawing explanation
Fig. 1 is dehumidifying turbine system schematic diagram in machine of the present invention.
Fig. 2 is the close-up schematic view of steam reheater in Fig. 1.
Fig. 3 is steam reheater cross sectional representation of the present invention.
Fig. 4 is the linkage structure schematic diagram of upper and lower header in Fig. 3.
Fig. 5 is the A-A generalized section of Fig. 4.
Embodiment
Figure 1 shows that the machine interior dehumidifying reheat steam turbine system schematic of the embodiment of the present invention.As shown in the figure, this steam turbine is seven grades of impulse steam turbines, every grade comprises static cascade and moving blades, steam directly sends into steam turbine 2 by major steam line 1, steam reheater 3 is arranged between the fourth stage 2.4 adjacent in steam turbine and level V 2.5, and the steam intake 4.1 of steam reheater 3 is connected by the steam drawing-off mouth 4.2 of steam inducing tube 4 with the previous stage of the fourth stage and the front side of the third level 2.3.Be reheating in first-level machine shown in figure, namely a steam reheater is only set.If desired, several also can be set in steam turbine as two or three steam reheaters.
The condensed water of described steam reheater is connected drain valve 6 and flash vessel 7 by condensed water discharge outlet 5.1 with waste pipe 5, the low pressure steam flashed off enters the stage be in after steam reheater by steam tube 8, the draining of flash vessel enters condenser 10 by water pipe 9.
The working procedure of this system is, from the heating pipe group of drawing one steam before the previous stage 2.3 of steam reheater 3 and to be introduced by steam by steam inducing tube 4 steam reheater 3, this steam in heating pipe group through with the main steam stream heat exchange outside pipe group after the condensed water that produces enter drain valve 6 and flash vessel 7 by waste pipe 5, the low pressure steam flashed off enters the further expansion work of stage be in after steam reheater by steam tube 9, to improve the generating efficiency of this system further, the condensed water in flash vessel 7 then enters condenser 10 through water pipe 9 and recycles.
Fig. 2 is the close-up schematic view of steam reheater in Fig. 1, and Fig. 3 is steam reheater cross sectional representation of the present invention.As shown in Figures 2 and 3, comprise the upper semi-circle reheater and lower semi-circle reheater that surround turbine spindle 2.0, the junction surface of upper and lower semicircle reheater is on the horizontal plane by steam turbine 2 center line; Upper semi-circle reheater comprises upper semi-circle frame 3.10, upper semi-circle inner housing 3.11, upper semi-circle heating pipe group 3.12 between the inside and outside housing of described upper semi-circle, the end that is positioned at described junction surface place and the inside and outside housing of upper semi-circle and upper semi-circle heating pipe group are connected upper left header 3.13, upper right header 3.14; Lower semi-circle reheater comprises lower semi-circle frame 3.20, lower semi-circle inner housing 3.21, lower semi-circle heating pipe group 3.22 between the inside and outside housing of described lower semi-circle, bottom left header 3.24, bottom right header 3.23 that the end being positioned at described junction surface place and the inside and outside housing of lower semi-circle and lower semi-circle heating pipe group is connected; Described upper and lower semicircle heating pipe group is communicated with described upper left, upper right, bottom left, bottom right header; Be provided with fitting seat 11 bottom described lower semi-circle frame 3.20, described fitting seat is fixed on the mounting plate 12 of cylinder under steam turbine, fitting seat is provided with towards the steam intake 4.1 outside cylinder and condensed water discharge outlet 5.1.
The both ends of the surface of upper and lower semicircle frame of described steam reheater and the bi-side of the mounting groove 2.2 of steam turbine shell 2.1 are sliding connection, the described exit end face of upper and lower semicircle inner housing contacts with the dividing plate 2.50 of next stage adjacent and connects, and can not leak when making main steam flow through reheater.
Above-mentioned steam reheater structure of the present invention meets steam turbine structure feature, greatly facilitates the installation of steam reheater.The more important thing is that this structure makes reheater can make full use of the inner space of steam turbine, make the utilization ratio of the utilized area in countercylinder reach more than 80%, greatly increase steam circulation area and the heat exchange area of reheater.Because reheater has enough large heat exchange area, therefore can not use the initial steam in main steam pipe, as long as and be used in steam turbine the prime doing merit and draw gas just enough as reheating thermal source.Do the principle meeting energy cascade utilization like this, can further improve the thermal efficiency of steam turbine, decrease the steam pressure difference inside and outside reheater heating pipe simultaneously.Because what adopt in the heating pipe of the structure of original left and right subdivision is the initial steam of high pressure, and in the heating pipe of upper and lower subdivision structure of the present invention, adopt the stage bleeding of low pressure, therefore pressure reduction is less, and the Security of the reheater structure of upper and lower subdivision is further improved.The present invention makes the structure of upper and lower subdivision into the reheater structure of left and right subdivision.Upper and lower two halves annulus forms a Ge Zheng garden, and its junction plane is on the horizontal plane passing through steam turbine center line.Such structure and the basic structure of steam turbine compatible, reheater can make full use of the annular space in cylinder, and through-current capability and the exchange capability of heat of reheater improve greatly, heat request again in the machine that fully can meet large-size steam turbine.
Structure due to upper and lower subdivision causes two horizontal integration faces, left and right, and its bonded area reaches 0.5 square meter respectively.Because combination force=junction plane area × vapor pressure, when vapor pressure is 3MPa, then the combination force in single horizontal integration face will be greater than 150 tons.Under will arranging in such narrow space, the fastening structure of so large intensity is very difficult, even can because taking up room excessive and counteracting the benefit of horizonally split structure.Therefore spy devises header linkage structure special as follows.
Fig. 4 is the linkage structure schematic diagram of the upper and lower header in Fig. 3, and Fig. 5 is the A-A generalized section of Fig. 4.As shown in Figure 4 and Figure 5, the joint of described upper right header 3.13 and the joint of bottom right header 3.23, upper left header 3.14 and bottom left header 3.24 is arranged on the header side adjacent with cylinder shell 2.1, the some apertures 13 passed through for steam and condensed water are set in the joint correspondence of the joint of described upper right header 3.13 and bottom right header 3.23, upper left header 3.14 and bottom left header 3.24, sealing flange 14 is set around aperture; The through hole of some bolts 15 is set at the connection part of described upper right header 3.13, the connection part of upper left header 3.14, arrange some inner bolt holes 15.1 in the connection part of bottom right header, the connection part correspondence of bottom left header, upper and lower half header is fixedly connected with by bolt 15.
Sealing flange 14 adopts fine grinding rigid seal face, both can ensure the sealing at junction surface place, also can ensure its dimensional stability.As can be seen from above-mentioned linkage structure, because steam passes through from aperture 13, and the area in aperture is only about 120 square centimeters, adds use low pressure steam, the impacting force of therefore required clamping bolt can significantly decline, and only has about 1% of conventional fastener bolt.Such structure also makes bolt 15 be in the marginal position of close cylinder wall 2.1, therefore can not be formed main steam circulation road and hinder.
Adopt said structure, in reheater heating pipe group, the flow path of steam and condensed water is: the prime of steam turbine is drawn gas and entered lower semi-circle heating pipe group 3.22 by the steam intake 4.1 of reheater, then bottom right header 3.23 is entered, again by upper, the aperture 13 of the joint of lower collecting box enters upper right header 3.13, then upper semi-circle heating pipe group 3.12 is entered, enter into upper left header 3.14 again, again by upper, the aperture 13 of the joint of lower collecting box enters bottom left header 3.24, then by lower semi-circle heating pipe group 3.22, the condensed water produced in heat transfer process is discharged from condensed water discharge outlet 5.1.
For strengthening heat transfer effect further, improve the generating efficiency of steam turbine, as shown in Figure 5, the heating pipe of described upper semi-circle and lower semi-circle heating pipe group is oval pipe 3.01, and oval major axis is parallel with the direction of main steam stream in steam turbine.Elliptical tube, compared to circular pipe, under the condition that heat exchange area is equal, can increase by the main steam flow area of about 50%, the gas-flow resistance of the low reheater of a step-down of going forward side by side.Described oval pipe arranges fin 3.02, to strengthen heat exchange area further.
In a word, the technological scheme of the reheater of the subdivision up and down that the present invention proposes, make full use of space in steam turbine and use prime to draw gas as reheater thermal source, not only simplify the mounting process of reheater, achieve energy-saving and cost-reducing, and improve reheater ability to work, improve the performance of saturated steam turbine, be therefore specially adapted to large steam turbine.
Claims (6)
1. steam reheater in the machine of a multistage impulse turbine, be included between stage and one or several steam reheaters are set, it is characterized in that, the steam inlet being arranged on the steam reheater between steam turbine adjacent level is connected by the steam drawing-off mouth of steam inducing tube with on front side of its previous stage or front some grades of front sides, in described machine, steam reheater comprises the upper semi-circle reheater and lower semi-circle reheater that surround turbine spindle, and the junction surface of upper and lower semicircle reheater is on the horizontal plane by steam turbine center line; Upper semi-circle reheater comprises upper semi-circle frame, upper semi-circle inner housing, upper semi-circle heating pipe group between the inside and outside housing of described upper semi-circle, the end that is positioned at described junction surface place and the inside and outside housing of upper semi-circle and upper semi-circle heating pipe group are connected upper left header, upper right header; Lower semi-circle reheater comprises lower semi-circle frame, lower semi-circle inner housing, lower semi-circle heating pipe group between the inside and outside housing of described lower semi-circle, bottom left header, bottom right header that the end being positioned at described junction surface place and the inside and outside housing of lower semi-circle and lower semi-circle heating pipe group is connected; Described upper and lower semicircle heating pipe group is communicated with described upper left, upper right, bottom left, bottom right header; Be provided with fitting seat bottom described lower semi-circle frame, reheater is fixed on the mounting plate of cylinder under steam turbine by fitting seat, fitting seat is provided with towards the steam intake outside cylinder and condensed water discharge outlet.
2. steam reheater in machine according to claim 1, it is characterized in that, the upper and lower both ends of the surface of semicircle frame of described steam reheater and the bi-side of the mounting groove of steam turbine are sliding connection, and the exit end face of described upper and lower semicircle inner housing is connected with the baffle contacts of next stage adjacent.
3. steam reheater in machine according to claim 1, it is characterized in that, the joint of described upper right header and the joint of bottom right header, upper left header and bottom left header is arranged on the header side adjacent with cylinder wall, the some apertures passed through for steam and condensed water are set in the joint correspondence of described upper right header and the joint of bottom right header, upper left header and bottom left header, sealing flange is set around aperture; Arrange the through hole of some bolts at the connection part of described upper right header, the connection part of upper left header, arrange some inner bolt holes in the connection part of bottom right header, the connection part correspondence of bottom left header, upper and lower half header is bolted to connection.
4. steam reheater in machine according to claim 1, is characterized in that, the heating pipe of described upper semi-circle and lower semi-circle heating pipe group is oval pipe, and the major axis of described ellipse is parallel with the direction of main steam stream in steam turbine.
5. steam reheater in machine according to claim 4, is characterized in that, described oval pipe arranges fin.
6. steam reheater in machine according to claim 1, it is characterized in that, the condensed water of described steam reheater is connected drain valve and flash vessel by condensed water discharge outlet with waste pipe, the low pressure steam flashed off enters the stage be in after steam reheater by steam tube, the draining of flash vessel enters condenser by water pipe.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410290181.6A CN104088677B (en) | 2014-06-25 | 2014-06-25 | Steam reheater in a kind of machine of multistage impulse turbine |
| PCT/CN2015/078336 WO2015196869A1 (en) | 2014-06-25 | 2015-05-06 | Built-in steam reheater of multi-stage impulse steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410290181.6A CN104088677B (en) | 2014-06-25 | 2014-06-25 | Steam reheater in a kind of machine of multistage impulse turbine |
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| Publication Number | Publication Date |
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| CN104088677A CN104088677A (en) | 2014-10-08 |
| CN104088677B true CN104088677B (en) | 2016-03-02 |
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| CN201410290181.6A Active CN104088677B (en) | 2014-06-25 | 2014-06-25 | Steam reheater in a kind of machine of multistage impulse turbine |
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| WO (1) | WO2015196869A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104088677B (en) * | 2014-06-25 | 2016-03-02 | 北京越麓咨询有限责任公司 | Steam reheater in a kind of machine of multistage impulse turbine |
| CN112627910A (en) * | 2020-12-30 | 2021-04-09 | 哈尔滨汽轮机厂有限责任公司 | Variable-rotating-speed designed main circulation water-feeding pump steam turbine |
| CN114087035A (en) * | 2021-10-30 | 2022-02-25 | 中国长江动力集团有限公司 | Low-parameter reheating condensing steam turbine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6003317A (en) * | 1995-10-17 | 1999-12-21 | Siemens Aktiengesellschaft | Method of generating sealing steam for a steam turbine, steam power plant having a steam turbine and method of starting up a steam turbine |
| CN1687566A (en) * | 2005-04-19 | 2005-10-26 | 广州市瑞溥能源环保科技有限公司 | Multistage impulsion type steam turbine with damp being removed and heat being regained inside machine |
| CN1710368A (en) * | 2004-06-18 | 2005-12-21 | 高尧林 | Multi-spiral-path chasing |
| CN203906022U (en) * | 2014-06-25 | 2014-10-29 | 北京越麓咨询有限责任公司 | Built-in steam reheater of multistage impulse steam turbine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3908381A (en) * | 1974-11-20 | 1975-09-30 | Sperry Rand Corp | Geothermal energy conversion system for maximum energy extraction |
| KR20000071290A (en) * | 1999-01-29 | 2000-11-25 | 제이 엘. 차스킨, 버나드 스나이더, 아더엠. 킹 | Rotating diffuser for pressure recovery in a steam cooling circuit of a gas turbine |
| CN102678204B (en) * | 2011-03-18 | 2014-12-17 | 中国电力工程顾问集团华东电力设计院 | Single reheating thermal system |
| EP2666977A1 (en) * | 2012-05-21 | 2013-11-27 | Alstom Technology Ltd | High-temperature steam turbine power plant with double reheat |
| CN104088677B (en) * | 2014-06-25 | 2016-03-02 | 北京越麓咨询有限责任公司 | Steam reheater in a kind of machine of multistage impulse turbine |
-
2014
- 2014-06-25 CN CN201410290181.6A patent/CN104088677B/en active Active
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2015
- 2015-05-06 WO PCT/CN2015/078336 patent/WO2015196869A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6003317A (en) * | 1995-10-17 | 1999-12-21 | Siemens Aktiengesellschaft | Method of generating sealing steam for a steam turbine, steam power plant having a steam turbine and method of starting up a steam turbine |
| CN1710368A (en) * | 2004-06-18 | 2005-12-21 | 高尧林 | Multi-spiral-path chasing |
| CN1687566A (en) * | 2005-04-19 | 2005-10-26 | 广州市瑞溥能源环保科技有限公司 | Multistage impulsion type steam turbine with damp being removed and heat being regained inside machine |
| CN203906022U (en) * | 2014-06-25 | 2014-10-29 | 北京越麓咨询有限责任公司 | Built-in steam reheater of multistage impulse steam turbine |
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| CN104088677A (en) | 2014-10-08 |
| WO2015196869A1 (en) | 2015-12-30 |
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Effective date of registration: 20161209 Address after: 100026 Beijing City, Chaoyang District Hui New Street No. 11 Ziguang building A block 12 layer Patentee after: Beijing Long Wo Albert Technology Co., Ltd. Address before: 100010 Beijing city Shijingshan District Lugu Road No. 20 Changan 2201 landscape poems Patentee before: BEIJING YUELU CONSULTING CO., LTD. |