CN103291367A - Steam-coagulating back-pressure steam turbine - Google Patents
Steam-coagulating back-pressure steam turbine Download PDFInfo
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- CN103291367A CN103291367A CN2013102159855A CN201310215985A CN103291367A CN 103291367 A CN103291367 A CN 103291367A CN 2013102159855 A CN2013102159855 A CN 2013102159855A CN 201310215985 A CN201310215985 A CN 201310215985A CN 103291367 A CN103291367 A CN 103291367A
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Abstract
The invention relates to a steam turbine, in particular to a steam-coagulating back-pressure steam turbine, and aims to solve the problems that existing extraction condensing steam turbines for heat supply units have limited heating capacity, and back-pressure steam turbines cannot provide more heating quantity for discontinuous heating due to structural limitation, especially in extremely cold working conditions in winter, and are poor in applicability. The steam-coagulating back-pressure steam turbine comprises a high-intermediate-pressure combined cylinder, a low-pressure cylinder, a first bearing box, a second bearing box, a third bearing box, a clutch, a high-intermediate-pressure rotor, a low-pressure rotor, an intermediate shaft, two low-pressure valves, two low-pressure steam guide pipes, two intermediate-low-pressure steam guide pipes and two switch valves. The high-intermediate-pressure combined cylinder is arranged between and connected with the first bearing box and the second bearing box. The second bearing box is arranged between and connected with the high-intermediate-pressure combined cylinder and the low-pressure cylinder. The third bearing box is arranged at the other end, opposite to the low-pressure cylinder, of the second bearing box. The intermediate shaft and the clutch are arranged between the high-intermediate-pressure rotor and the low-pressure rotor. The steam-coagulating back-pressure steam turbine is applied to heat supply and power generation of combined heat and power generation.
Description
Technical field
The present invention relates to a kind of steam turbine, be specifically related to a kind of 320MW condensing, back pressure and the combination turbine that draws gas.
Background technique
The domestic heat supply unit that puts into operation at present is mainly sucking condensing turbine, secondly is back pressure turbine.But sucking condensing turbine in non-heat supply phase pure condensate operation, all steam all are used for generating, can extract part steam out in the heat supply phase and be used for heat supply, but the amount of drawing gas is limited.The whole steam discharges of back pressure turbine all can be used for heat supply, the heat and power supply ratio reaches capacity, but because its structural limitations, only be applicable to long-term continuous heat supply, for discontinuous heat supply, extremely cold operating mode can't provide more heating loads especially in the winter time, and its Economy and applicability are relatively poor, therefore, having the heat supply steam turbine of regulating the amount of drawing gas on a large scale has to be solved.
Summary of the invention
The objective of the invention is for solve existing heat supply unit with the sucking condensing turbine heat capacity limited and back pressure turbine because its structural limitations, for discontinuous heat supply, especially in the winter time extremely cold operating mode can't provide more heating loads, the relatively poor problem of applicability, and then a kind of condensing back pressure turbine is provided.
The present invention addresses the above problem the technological scheme of taking to be: a kind of condensing back pressure turbine of the present invention comprises senior middle school's pressing cylinder, low pressure (LP) cylinder, the clutch shaft bearing case, second bearing housing, the 3rd bearing housing, clutch, the high pressure rotor, low pressure rotor, jack shaft, two low pressure valves, two low pressure steam guiding tubes, two mesolow steam guiding tubes and two switch valves, two mesolow steam guiding tubes are arranged on the both sides of second bearing housing, senior middle school's pressing cylinder is communicated with by two mesolow steam guiding tubes with low pressing cylinder, mesolow steam guiding tube between one of them low pressure steam guiding tube two ends is equipped with a switch valve, mesolow steam guiding tube between another low pressure steam guiding tube two ends is equipped with another switch valve, be provided with the senior middle school's pressing cylinder that is connected with the two between clutch shaft bearing case and second bearing housing, be provided with second bearing housing that is connected with the two between senior middle school's pressing cylinder and the low pressure (LP) cylinder, the other end of the low pressure (LP) cylinder relative with second bearing housing is provided with the 3rd bearing housing, two low pressure valves are set up in parallel the both sides at second bearing housing, the low pressure steam guiding tube is communicated with the mesolow steam guiding tube by low pressure valve, the high pressure rotor is installed in the high intermediate pressure cylinder, low pressure rotor is installed in the low-pressure cylinder, be provided with jack shaft and clutch between high pressure rotor and the low pressure rotor, one end of jack shaft is connected with the high pressure rotor, the other end of jack shaft is connected with the output terminal of clutch, and the input end of clutch is connected with low pressure rotor.
The invention has the beneficial effects as follows: the present invention is in the non-heat supply phase in summer, and unit is with the pure condensate mode operation, the about 320MW of specified generated energy; Winter, conventional heat supply phase unit was to take out mode operation with fixed attention, the amount of drawing gas can be adjusted between 0～680t/h according to the heat load needs, existing 320MW heat supply unit is with the about 320t/h of the steam turbine maximum amount of drawing gas, extremely cold operating mode can't provide more heating loads in the winter time, extremely cold phase heat load demand increases in the winter time, the heat supply of 680t/h is drawn gas in the time of can't meeting the demands, two switch valves and two low pressure valves are closed, disconnecting low pressure (LP) cylinder is communicated with senior middle school pressing cylinder, at this moment, be arranged on clutch between high pressure rotor and low pressure rotor according to the rotating speed automatic disconnection of high pressure rotor and low pressure rotor, take out the switching of coagulating pattern and back pressure pattern thereby finish, at this moment, steam turbine moves with back pressure pattern, senior middle school's pressing cylinder isolated operation, the high pressure steam discharge all is used for increasing heat supply, condensing provided by the invention, back pressure and the combination turbine that draws gas, conventional heating load reaches 550t/h, maximum heating load 800t/h, solved effectively existing heat supply unit with the sucking condensing turbine heat capacity limited and back pressure turbine because its structural limitations, for discontinuous heat supply, extremely cold operating mode can't provide more heating loads especially in the winter time, the problem that applicability is relatively poor.The present invention had both taken into account operation and efficient under the various operating modes for the cogeneration project, had reduced the project investment cost again, considered from energy-saving and environmental protection and cost of investment angle, and the present invention can generally be applicable to cogeneration of heat and power construction project usefulness.
Description of drawings
Fig. 1 is main TV structure schematic representation of the present invention, and Fig. 2 is the plan structure schematic representation of Fig. 1, and Fig. 3 is the A-A sectional view of Fig. 2.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1-Fig. 3, a kind of condensing back pressure turbine of present embodiment comprises senior middle school's pressing cylinder 2, low pressure (LP) cylinder 5, clutch shaft bearing case 1, second bearing housing 3, the 3rd bearing housing 6, clutch 4, high pressure rotor 17, low pressure rotor 19, jack shaft 18, two low pressure valves 8, two low pressure steam guiding tubes 10, two mesolow steam guiding tubes 15 and two switch valves 7, two mesolow steam guiding tubes 15 are arranged on the both sides of second bearing housing 3, senior middle school's pressing cylinder 2 is communicated with by two mesolow steam guiding tubes 15 with low pressing cylinder 5, mesolow steam guiding tube 15 between one of them low pressure steam guiding tube 10 two ends is equipped with a switch valve 7, mesolow steam guiding tube 15 between another low pressure steam guiding tube 10 two ends is equipped with another switch valve 7, be provided with the senior middle school's pressing cylinder 2 that is connected with the two between clutch shaft bearing case 1 and second bearing housing 3, be provided with second bearing housing 3 that is connected with the two between senior middle school's pressing cylinder 2 and the low pressure (LP) cylinder 5, the other end of the low pressure (LP) cylinder 5 relative with second bearing housing 3 is provided with the 3rd bearing housing 6, two low pressure valves 8 are set up in parallel the both sides at second bearing housing 3, low pressure steam guiding tube 10 is communicated with mesolow steam guiding tube 15 by low pressure valve 8, high pressure rotor 17 is installed in the high intermediate pressure cylinder 2, low pressure rotor 19 is installed in the low-pressure cylinder 5, be provided with jack shaft 18 and clutch 4 between high pressure rotor 17 and the low pressure rotor 19, one end of jack shaft 18 is connected with high pressure rotor 17, the other end of jack shaft 18 is connected with the output terminal of clutch 4, and the input end of clutch 4 is connected with low pressure rotor 19.
The specified pure condensate power of the condensing back pressure turbine of present embodiment is 320MW, and it divides high pressure rotor and low pressure rotor, adopts clutch to connect between high pressure rotor and the low pressure rotor, and low pressure (LP) cylinder can start and close as required, but the high intermediate pressure cylinder isolated operation; This steam turbine adopts the pattern (being generator 29 preposition patterns) of high voltage terminal output power, and generator 29 is arranged on the end of the clutch shaft bearing case adjacent with the output terminal of high pressure rotor.Two mesolow steam guiding tubes of present embodiment arrange bypass, and low pressure valve is set in the bypass, the connection of cutoff low cylinder and senior middle school's pressing cylinder when being used for initial low pressure and starting low pressure (LP) cylinder and heat supply and need; On the mesolow steam guiding tube switch valve is set, is used for cooperating the connection of low pressure valve cutoff low cylinder and senior middle school's pressing cylinder, the also connection of cutoff low cylinder and senior middle school's pressing cylinder to realize senior middle school's pressing cylinder isolated operation, reaches the purpose that back pressure increases the vapour heat supply simultaneously.Three bearing housings of the steam turbine of present embodiment all adopt floor model.Between the steam turbine high pressure rotor of present embodiment and the clutch flexible jack shaft is set, is used for eliminating the high pressure rotor bow to the influence of clutch alignment.
The used clutch of present embodiment is a whole set of outsourcing product, and Britain SSS Gears company makes, and model is 340T.Clutch is arranged between high pressure rotor and the low pressure rotor, and the power input end directly is connected with low pressure rotor, and output terminal is connected with the high pressure rotor by jack shaft.When low pressure rotor was attempted surpassing the speed of high pressure rotor, clutch automatically connected two rotors.At unlocking condition, when low pressure rotor slowed down with respect to the high pressure rotor, clutch was thrown off automatically; 340T type clutch belongs to the pure mechanical clutch of override type mechanism, does not have special control system, adopts ratchet to stir the tooth cover and slides along helix, realizes engagement or disengagement.One-level, secondary ratchet are arranged, the one-level ratchet meshes being lower than below the 500r/min, the secondary ratchet is under low speed, lubrication pressure is depressed it, centrifugal force is with its engagement of upspringing during high speed, clutch has locking function, together locks when jiggering or coaxial startup at high intermediate pressure cylinder and low pressure (LP) cylinder, and low pressure (LP) cylinder and an axle back rotating speed reach 2950r/min and also need lock.And lose and reply bit function by cable;
Must there be radial journal bearing at the clutch two ends, in order to avoid throw off the back beat.The bearing of senior middle school's pressure side is to support clutch separately, and high pressure rotor and clutch need adjunction major axis, and maximum elevation difference is no more than 0.4, otherwise can't mesh.Clutch can be proofreaied and correct level difference automatically in the engagement process.Simultaneously steam turbine is brought big a variation, thrust-bearing can only be arranged in the outer end of high intermediate pressure cylinder, low pressure (LP) cylinder; Clutch needs two ends radial journal bearing supplying lubricating oil, and the oil groove between bearing and main shaft, the oilhole between coupling be the location accurately.Clutch can absorb bloated poor about 35mm, and after low-voltage module was thrown off, because the damping effect of clutch internal lubrication oil, low pressure rotor still can be with the rotational speed about 200r/min.
Embodiment two: in conjunction with Fig. 2 and Fig. 3 present embodiment is described, the described steam turbine of present embodiment comprises that also barring gear 28, the three bearing housings 6 are provided with the barring gear 28 that is installed on the low pressure rotor 19.So arrange, barring gear is arranged on the low pressure rotor, and starting the back low pressure rotor can drive high pressure rotor jiggering together by clutch.Other is identical with embodiment one.
Embodiment three: in conjunction with Fig. 1 and Fig. 2 present embodiment is described, the described steam turbine of present embodiment also comprises two high pressure valves 11 and two high pressure steam guiding tubes 12, and high pressure valve 11 is communicated with senior middle school pressing cylinder 2 by high pressure steam guiding tube 12.So arrange, during senior middle school pressing cylinder admission, be convenient to regulate and switch.Other is identical with embodiment one.
Embodiment four: in conjunction with Fig. 1 and Fig. 2 present embodiment is described, the described steam turbine of present embodiment also comprises presses steam guiding tube 14 among two middle pressure valves 13 and two, and middle pressure valve 13 is communicated with senior middle school pressing cylinder 2 by middle pressure steam guiding tube 14.So arrange, during senior middle school pressing cylinder admission, be convenient to regulate and switch.Other is identical with embodiment one or three.
Embodiment five: present embodiment is described in conjunction with Fig. 1 and Fig. 2, the described steam turbine of present embodiment also comprises two modulating valve 9, mesolow steam guiding tube 15 between one of them low pressure steam guiding tube 10 two ends is equipped with a modulating valve 9, and the mesolow steam guiding tube 15 between another low pressure steam guiding tube 10 two ends is equipped with another modulating valve 9.So arrange, under the situation that switch valve is opened, be convenient to regulate the throttle flow of senior middle school's pressing cylinder and low pressure (LP) cylinder connection admission.Other is identical with embodiment one.
Embodiment six: in conjunction with Fig. 1 and Fig. 2 present embodiment is described, described two switch valves 7 of present embodiment are butterfly valve, and two modulating valve 9 are butterfly valve.So arrange, easy to use and reliable.Other is identical with embodiment five.
Embodiment seven: present embodiment is described in conjunction with Fig. 3, the described steam turbine of present embodiment also comprises first thrust-bearing 20 and second thrust-bearing 21, first thrust-bearing 20 is installed in the end of the high pressure rotor 17 adjacent with clutch shaft bearing case 1, and second thrust-bearing 21 is installed in the end of the low pressure rotor 19 adjacent with the 3rd bearing housing 6.So arrange, solved the problem that clutch can't transmit end thrust.Other is identical with embodiment one or two.
Embodiment eight: present embodiment is described in conjunction with Fig. 3, the described steam turbine of present embodiment also comprises two clutch shaft bearings 22 and two second bearings 25, high pressure rotor 17 supports by two clutch shaft bearings 22, and low pressure rotor 19 supports by two second bearings 25.So arrange, be convenient to the steady running of high pressure rotor and low pressure rotor.Other is identical with embodiment one or two.
Embodiment nine: in conjunction with Fig. 3 present embodiment is described, the described steam turbine of present embodiment also comprises the 3rd bearing 24 and the 4th bearing 27, and jack shaft 18 supports by the 3rd bearing 24, and the jiggering gear of barring gear 28 supports by the 4th bearing 27.So arrange, the jack shaft running is reliable and stable, and the barring gear running is reliable and stable.Other is identical with embodiment eight.
Working procedure
320MW of the present invention coagulates gas back pressure turbine steam guiding tube and adopts floor model, is provided with valve (being used for regulating and turn-offing) on the steam guiding tube, is respectively applied to adjust draw gas and close low-pressure turbine; The steam guiding tube bypass is provided with low pressure valve, and the low pressure cylinder that is used under the back pressure pattern (low pressure cylinder cuts out) starts.The clutch that is arranged between high pressure and low pressure rotor can be taken out the switching of coagulating pattern and back pressure pattern thereby finish according to the rotating speed engagement automatically and disengagement of high pressure rotor and low pressure rotor.Three bearing housings of unit all adopt floor model, guarantee the influence that the bearing absolute altitude is not expanded by cylinder body, make bearing have good stable.For guaranteeing the centering of clutch input end and output terminal, between high pressure rotor and clutch, be provided with flexible jack shaft especially, this jack shaft is single back shaft, by the 3rd bearings.The high pressure rotor supports by two clutch shaft bearings, and low pressure rotor is by two second bearings, and overhanging the 4th bearing that is provided with of low pressure rotor is for the gear weight that supports the low pressure barring gear in addition.Because clutch can't transmit end thrust, so this steam turbine is established first thrust-bearing altogether and second thrust-bearing is installed in high pressure rotor front end and low pressure rotor rear end respectively.This steam turbine is established a barring gear and is installed in the low pressure rotor rear end, and starting the back low pressure rotor can drive high pressure rotor jiggering together by clutch.
Claims (9)
1. condensing back pressure turbine, it is characterized in that: it comprises senior middle school's pressing cylinder (2), low pressure (LP) cylinder (5), clutch shaft bearing case (1), second bearing housing (3), the 3rd bearing housing (6), clutch (4), high pressure rotor (17), low pressure rotor (19), jack shaft (18), two low pressure valves (8), two low pressure steam guiding tubes (10), two mesolow steam guiding tubes (15) and two switch valves (7), two mesolow steam guiding tubes (15) are arranged on the both sides of second bearing housing (3), senior middle school's pressing cylinder (2) is communicated with by two mesolow steam guiding tubes (15) with low pressing cylinder (5), be positioned on the mesolow steam guiding tube (15) between one of them low pressure steam guiding tube (10) two ends a switch valve (7) is installed, be positioned on the mesolow steam guiding tube (15) between another low pressure steam guiding tube (10) two ends another switch valve (7) is installed, be provided with the senior middle school's pressing cylinder (2) that is connected with the two between clutch shaft bearing case (1) and second bearing housing (3), be provided with second bearing housing (3) that is connected with the two between senior middle school's pressing cylinder (2) and the low pressure (LP) cylinder (5), the other end of the low pressure (LP) cylinder (5) relative with second bearing housing (3) is provided with the 3rd bearing housing (6), two low pressure valves (8) are set up in parallel the both sides in second bearing housing (3), low pressure steam guiding tube (10) is communicated with mesolow steam guiding tube (15) by low pressure valve (8), high pressure rotor (17) is installed in the high intermediate pressure cylinder (2), low pressure rotor (19) is installed in the low-pressure cylinder (5), be provided with jack shaft (18) and clutch (4) between high pressure rotor (17) and the low pressure rotor (19), one end of jack shaft (18) is connected with high pressure rotor (17), the other end of jack shaft (18) is connected with the output terminal of clutch (4), and the input end of clutch (4) is connected with low pressure rotor (19).
2. a kind of condensing back pressure turbine according to claim 1, it is characterized in that: described steam turbine also comprises barring gear (28), the 3rd bearing housing (6) is provided with the barring gear (28) that is installed on the low pressure rotor (19).
3. a kind of condensing back pressure turbine according to claim 1, it is characterized in that: described steam turbine also comprises two high pressure valves (11) and two high pressure steam guiding tubes (12), high pressure valve (11) is communicated with senior middle school's pressing cylinder (2) by high pressure steam guiding tube (12).
4. according to claim 1 or 3 described a kind of condensing back pressure turbines, it is characterized in that: described steam turbine also comprises among two middle pressure valves (13) and two presses steam guiding tube (14), and middle pressure valve (13) is communicated with senior middle school's pressing cylinder (2) by middle pressure steam guiding tube (14).
5. a kind of condensing back pressure turbine according to claim 1, it is characterized in that: described steam turbine also comprises two modulating valve (9), be positioned on the mesolow steam guiding tube (15) between one of them low pressure steam guiding tube (10) two ends a modulating valve (9) is installed, be positioned on the mesolow steam guiding tube (15) between another low pressure steam guiding tube (10) two ends another modulating valve (9) is installed.
6. a kind of condensing back pressure turbine according to claim 5, it is characterized in that: described two switch valves (7) are butterfly valve, and two modulating valve (9) are butterfly valve.
7. a kind of condensing back pressure turbine according to claim 1 and 2, it is characterized in that: described steam turbine also comprises first thrust-bearing (20) and second thrust-bearing (21), first thrust-bearing (20) is installed in the end of the high pressure rotor (17) adjacent with clutch shaft bearing case (1), and second thrust-bearing (21) is installed in the end of the low pressure rotor (19) adjacent with the 3rd bearing housing (6).
8. a kind of condensing back pressure turbine according to claim 1 and 2, it is characterized in that: described steam turbine also comprises two clutch shaft bearings (22) and two second bearings (25), high pressure rotor (17) supports by two clutch shaft bearings (22), and low pressure rotor (19) supports by two second bearings (25).
9. a kind of condensing back pressure turbine according to claim 8, it is characterized in that: described steam turbine also comprises the 3rd bearing (24) and the 4th bearing (27), jack shaft (18) supports by the 3rd bearing (24), and the jiggering gear of barring gear (28) supports by the 4th bearing (27).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102159855A CN103291367A (en) | 2013-06-03 | 2013-06-03 | Steam-coagulating back-pressure steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102159855A CN103291367A (en) | 2013-06-03 | 2013-06-03 | Steam-coagulating back-pressure steam turbine |
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| CN103291367A true CN103291367A (en) | 2013-09-11 |
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| CN2013102159855A Pending CN103291367A (en) | 2013-06-03 | 2013-06-03 | Steam-coagulating back-pressure steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963211A (en) * | 2021-03-26 | 2021-06-15 | 华能江阴燃机热电有限责任公司 | Steam turbine of cogeneration system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB377048A (en) * | 1930-11-04 | 1932-07-21 | Asea Ab | Improved radial flow steam turbine |
| JP2011102540A (en) * | 2009-11-10 | 2011-05-26 | Toshiba Corp | Steam turbine power generation facility and method of operating the same |
| CN102140938A (en) * | 2011-03-18 | 2011-08-03 | 上海电气电站设备有限公司 | Double-cylinder coaxial combined cycle heat supply gas turbine |
| CN202578806U (en) * | 2012-06-15 | 2012-12-05 | 哈尔滨汽轮机厂有限责任公司 | 3600-turn ultra-high-voltage 150-MW steam turbine |
| CN202645645U (en) * | 2012-07-20 | 2013-01-02 | 哈尔滨汽轮机厂有限责任公司 | 127 MW triple-pressure reheating combined cycle steam turbine |
-
2013
- 2013-06-03 CN CN2013102159855A patent/CN103291367A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB377048A (en) * | 1930-11-04 | 1932-07-21 | Asea Ab | Improved radial flow steam turbine |
| JP2011102540A (en) * | 2009-11-10 | 2011-05-26 | Toshiba Corp | Steam turbine power generation facility and method of operating the same |
| CN102140938A (en) * | 2011-03-18 | 2011-08-03 | 上海电气电站设备有限公司 | Double-cylinder coaxial combined cycle heat supply gas turbine |
| CN202578806U (en) * | 2012-06-15 | 2012-12-05 | 哈尔滨汽轮机厂有限责任公司 | 3600-turn ultra-high-voltage 150-MW steam turbine |
| CN202645645U (en) * | 2012-07-20 | 2013-01-02 | 哈尔滨汽轮机厂有限责任公司 | 127 MW triple-pressure reheating combined cycle steam turbine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112963211A (en) * | 2021-03-26 | 2021-06-15 | 华能江阴燃机热电有限责任公司 | Steam turbine of cogeneration system |
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Application publication date: 20130911 |