CN202832677U - Steam flow control device for high pressure cylinder interlayer of steam turbine - Google Patents
Steam flow control device for high pressure cylinder interlayer of steam turbine Download PDFInfo
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- CN202832677U CN202832677U CN 201220372220 CN201220372220U CN202832677U CN 202832677 U CN202832677 U CN 202832677U CN 201220372220 CN201220372220 CN 201220372220 CN 201220372220 U CN201220372220 U CN 201220372220U CN 202832677 U CN202832677 U CN 202832677U
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Abstract
The utility model relates to a steam flow control device for a high pressure cylinder interlayer of a steam turbine. The steam flow of the interlayer of the existing steam turbine is unadjustable and steam waste is caused. The steam flow control device comprises a housing and a rotor, wherein a nozzle box is arranged between the housing and the rotor; the housing comprises an outer cylinder and an inner cylinder; the interlayer is arranged between the outer cylinder and the inner cylinder; a steam working channel is reserved between the inner cylinder and the rotor; a shaft seal is arranged at the connecting part between the inner cylinder and the rotator; a steam seal with a steam blocking loop is arranged between the end parts of the inner cylinder and the outer cylinder; a guide tube is arranged on a side wall of the outer cylinder one side of the steam blocking loop, close to the nozzle box; an electric valve is arranged on the guide tube; the guide tube steam outlet path is additionally arranged based on the original steam blocking loop steam outlet to realize the control of a temperature of the outer cylinder; the steam flow control device improves the utilization efficiency of steam, reduces waste, ensures that the temperature of the outer cylinder is matched with that of the inner cylinder, further prevents the rotation restriction of the rotor due to the deformation of the inner cylinder and the outer cylinder, and ensures the normal operation of the steam turbine.
Description
Technical field
The utility model relates to a kind of steam power plant, is specifically related to a kind of steam turbine high-pressure cylinder jacket steam flow control device.
Background technique
Steam turbine comprises shell and is positioned at enclosure and by the rotor of Steam Actuation that its shell adopts inside and outside cylinder structure usually, has both saved material, can also guarantee its intensity.Epitrochanterian multistage moving vane has formed steam work done passage with the multistage stator blade that is installed on the inner casing; Steam is imported into steam turbine and splits into big or small two personal shares after the boiler heating, large strand steam is by steam work done passage, its thermal power transfer is become mechanical energy, being used for drive rotor rotates, shallow bid steam enters in the interlayer of cylinder by the shaft seal between Inner cylinder and rotor, outer shell is by contacting the temperature difference that effectively reduces between itself and Inner cylinder with steam, thereby reduces differential expansion between the two, reduces deformation to the impact of coupling action between rotor and shell; Afterwards, two strands of steam converges and reenters boiler by outlet pipe, and recirculation is used.
In real work, except overhaul of the equipments and for subsequent use, the working procedure of steam turbine is divided into two states: generator operation state and startup and halted state.The flow of shallow bid steam is by a steam retaining ring control of being located in the interior outer shell interlayer on the steam turbine, in practical operation, in the time of the start up period that steam turbine is in, need to pass through the steam flow of interlayer more greatly, so that the lower outer shell of temperature heats up rapidly, reduce the differential expansion between interior outer shell, when steam turbine is in normal operating phase, need by the steam flow of interlayer less, can keep the outer shell temperature, also improve steam by the flow of rotor, guarantee working efficiency, and steam turbine to be in normal operating phase be long-term more than 95% of net cycle time (except maintenance and standby time) that accounts for, the jacket steam amount that need to keep the outer shell temperature is minimum, in the prior art, generally default 20 millimeters in gap in the steam retaining ring is so that the flow of shallow bid steam is in same level at any time, in the steam turbine normal course of operation, cause the steam significant wastage, also reduced the utilization ratio of steam.
The model utility content
In order to solve the deficiencies in the prior art, the utility model provides a kind of control gear that can regulate according to steam turbine different operating state steam flow in the interlayer, and further purpose of the present utility model provides a kind of steam turbine high-pressure cylinder jacket steam flow control device of steam utilization when improving the steam turbine working state.
The utility model is realized in the following manner: a kind of steam turbine high-pressure cylinder jacket steam flow control device, comprise shell and be built in the rotor that rotates in the shell, be provided with the nozzle box between the end of shell and rotor, described shell comprises outer shell and is plugged on Inner cylinder in the outer shell, and form interlayer between the two, leave steam work done passage between described Inner cylinder and rotor, the joint that it is characterized in that described Inner cylinder and rotor is provided with a shaft seal, be respectively equipped with steam retaining ring and the packing of coupling between the end of described Inner cylinder and outer shell, and between steam retaining ring and packing, form a steam flow channel, described steam retaining ring is provided with honeycomb duct near the outer shell sidewall of interlayer one side, and described honeycomb duct is provided with an electric valve.Set up a honeycomb duct of being controlled by electric valve on the basis that original steam retaining ring goes out vapour and gone out the vapour path, the vapour path that goes out of steam has become two by one, come the switch electric valve according to the outer shell temperature that steam turbine different operating state is corresponding, and then the steam flow in the control interlayer, realization is to the control of outer shell temperature, reduce the jacket steam flow when both having satisfied steam turbine long-term work state and improve steam utilization, improved the utilization ratio of steam, cut the waste, can in of short duration start and stop process, increase the jacket steam flow again, guarantee that outer shell temperature and Inner cylinder temperature are complementary, dwindle interior outer shell differential expansion, satisfy the requirement of steam turbine rapid starting/stopping machine, and then prevent that effectively rotor is out of shape limited in rotation because of interior outer shell, guarantee that steam turbine runs well; Described Inner cylinder end section is provided with outstanding steam retaining ring, and described outer shell end is provided with the packing with described gear compression ring coupling, and forms the steam flow channel of a ring-type between gear compression ring and packing.
As preferably, the gap of described steam flow channel is less than 3 millimeters.The gap of steam flow channel is reduced to by original 20 millimeters and is not more than 3 millimeters, greatly reduced the flow of steam, after steam turbine runs well, the operator only need close electric valve, a small amount of steam that steam flow channel is flow through in utilization is kept the temperature of outer shell, and guarantee that differential expansion between interior outer shell in certain allowed band, guarantees the Turbine Safety operation.
As preferably, the front end of described outer shell has placed a steam inlet pipe, and an end of described steam inlet pipe passes the Inner cylinder and is communicated with described nozzle box.The steam that is heated by boiler enters the nozzle box by steam inlet pipe, wherein large strand of steam is used for drive rotor and rotates by the stream passageway that is provided with impeller between Inner cylinder and rotor, and another shallow bid steam enters the cylinder interlayer by shaft seal, be used for the heating outer shell, effectively reduce the temperature difference between interior outer shell.
As preferably, the described steam retaining ring dorsad outer shell sidewall of nozzle box's one side is provided with an outlet pipe, and described outlet pipe is interconnected with interlayer, steam work done passage respectively.When steamer was in normal working, electronic valve was closed, and the steam in the interlayer can only pass through from steam retaining ring, and converged with large strand steam by stream passageway, discharged cylinder by outlet pipe together.
As preferably, described honeycomb duct one end is provided with 2 branches, and branch end is connected with the upper lower wall surface of described outer shell respectively, is connected with described electric valve after the other end converges.Whole Inner cylinder is wrapped up in the space of interlayer, the honeycomb duct of branch is communicated with the both sides of mezzanine space respectively, be more conducive to steam is discharged interlayer, increase the vapor stream flux, improve the warming velocity of outer shell, and controlled by same electric valve, both simplified structure also improved equipment efficiency of usage.
As preferably, described shaft seal one end is communicated with interlayer, and the other end is communicated with the nozzle box, and near described nozzle box.Nozzle box and shaft seal position are nearer, the shallow bid steam that is conducive to heat outer shell flows into interlayer by shaft seal from the nozzle box, and mobile and process steam retaining ring and honeycomb duct outflow along interlayer, so that the higher vapor stream mistake of temperature is constantly arranged between interlayer, guarantee that the temperature difference of interior outer shell is in more among a small circle.
As preferably, described electric valve is completely open and close formula valve, and controlled by the controller of steam turbine.The electric valve cost of completely open and close formula is lower, and safeguards simply, effectively reduces cost; The switch of electric valve is subjected to the control of turbine controller, and the operator realizes motor switch at suitable switch on opportunity by the Switching Condition that electric valve is set, and controls steam flow in the interlayer with this, further improves steam utilization efficient.
The beneficial effects of the utility model: a honeycomb duct with electric valve is set up on the original structure basis of interlayer between outer shell in steam turbine, so that the vapor stream outbound path has original one to increase to two, and control the logical of honeycomb duct by the switch of control electric control valve and close, realize that steam flow is regulated according to inside and outside temperature difference of the cylinder in the interlayer, in the temperature difference that can guarantee interior outer shell remains on more among a small circle, so that steam turbine casing can not produce deformation because of inside and outside temperature difference of the cylinder, prolong the working life of steam turbine, also effectively improve the utilization ratio of steam, make steam as much as possible be transported to Inner cylinder and drive rotor rotation, the working efficiency of Effective Raise steam turbine; By the opening and closing of control command realization electric valve, can satisfy simultaneously the steam turbine two states to the different requirements of jacket steam flow, under the prerequisite that guarantees unit safety and reliability, improve the Economy of steam turbine set operation.
Description of drawings
Fig. 1 the utility model structural representation;
Among the figure: 1, rotor, 2, the nozzle box, 3, outer shell, 4, the Inner cylinder, 5, interlayer, 6, shaft seal, 7, steam retaining ring, 8, honeycomb duct, 9, electric valve, 10, steam inlet pipe, 11, packing, 12, outlet pipe, 13, steam flow channel, 14, steam work done passage.
Embodiment
Below in conjunction with specification drawings and specific embodiments substantive distinguishing features of the present utility model is further described.
A kind of steam turbine high-pressure cylinder jacket steam flow control device as shown in Figure 1, comprise shell and be built in the rotor 1 that rotates in the shell, be provided with nozzle box 2 between the end of shell and rotor 1, described shell comprises outer shell 3 and is plugged on Inner cylinder 4 in the outer shell 3, and form interlayer 5 between the two, 1 of described Inner cylinder 4 and rotor leave steam work done passage 14, described Inner cylinder 4 is provided with a shaft seal 6 with the joint of rotor 1, be respectively equipped with steam retaining ring 7 and the packing 11 of coupling between the end of described Inner cylinder 4 and outer shell 3, and at steam retaining ring 7 and 11 formation of packing, one steam flow channel 13, described steam retaining ring 7 is provided with honeycomb duct 8 near outer shell 3 sidewalls of interlayer 5 one sides, described honeycomb duct 8 is provided with an electric valve 9, the high pressure steam that is imported by steam inlet pipe 10 can a leak part enter interlayer 5 from shaft seal 6, open and-shut mode by control electric valve 9 is regulated steam flow in the interlayer 5, and then the temperature of control outer shell 3; The gap of described steam flow channel 13 is less than 3 millimeters; The front end of described outer shell 3 has placed a steam inlet pipe 10, and an end of described steam inlet pipe 10 passes Inner cylinder 4 and is communicated with described nozzle box 2; Described steam retaining ring 7 dorsad outer shell 3 sidewalls of nozzle box's 2 one sides is provided with an outlet pipe 12, and described outlet pipe 12 is interconnected with interlayer 5, steam work done passage 14 respectively; Described honeycomb duct 8 one ends are provided with 2 branches, and branch end is connected with the upper lower wall surface of described outer shell 3 respectively, are connected with described electric valve 9 after the other end converges; Described shaft seal 6 one ends are communicated with interlayer 5, and the other end is communicated with nozzle box 2, and near described nozzle box 2; Described electric valve 9 is completely open and close formula valve, and controlled by the controller of steam turbine.
In specific operation, steam turbine is at the corresponding steam flow control state of different operating state phase:
1, be in firm when start up period when steam turbine, because steam directly contacts in rotor 1 and Inner cylinder 4 and the steam inlet pipe 10, temperature rises rapidly, and the steam flow in the interlayer 5 is not enough, and outer shell 3 temperature increase are comparatively slow.At this moment, by control system electric valve 9 is opened, so that the steam in the interlayer 5 can be by honeycomb duct 8 and 13 while of steam flow channel steam discharge, effectively increase the steam flow in the interlayer 5, outer shell 3 constantly contacts with the higher steam of temperature, so that outer shell 3 temperature rise rapidly, effectively reduce the temperature difference of 3 of Inner cylinder 4 and outer shells, and reduce Inner cylinder 4 and outer shell 3 because of differential expansion deformation, but in this process, because steam flow increases in the interlayer 5, can reduce the steam flow of 1 of Inner cylinder 4 and rotor, thereby reduce the manufacturing efficiency of steam turbine;
2, when steam turbine is in normal working, outer shell 3 has certain temperature, and and the temperature difference of 4 in Inner cylinder is less, in this process, to needing in interlayer 5, to circulate a small amount of steam to replenish outer shell 3 because contact the heat of understanding loss with ambient air, at this moment, close electric valve 9 by control system, so that a small amount of steam can only flow out by 13 1 approach of steam flow channel, effectively limited the discharge value of steam in the interlayer 5, and guaranteed that most steam is transported to nozzle box 2 and drive rotor 1 rotates, both guaranteed to have enough steam to keep outer shell 3 temperature, can also the Effective Raise steam utilization, improve the working efficiency of steam turbine, effectively avoid waste of steam.
In specific operation, usually distinguish different working staties according to the working load of steam turbine, preferred boundary load is 20%-30%, when the load of steam turbine less than 20% the time, electric valve 9 is opened, and guaranteeing has larger steam flow in the interlayer 5, when the load of steam turbine greater than 30% the time, electric valve 9 is closed, and guarantees to have in the interlayer 5 less steam flow to keep outer shell 3 temperature.Decomposing load can decide according to the actual conditions of steam turbine, and obtains higher working efficiency with this, and reduces as much as possible the differential expansion of 3 of inner casing and outer shells, all should be considered as specific embodiment of the utility model.
In specific operation, the gap of described steam flow channel 13 is less than 3 millimeters, preferred version is 1.5 millimeters, at this moment, the steam more than 99% enters the gap of 1 of vapour inner casing 4 and rotor, and drive rotor 1 rotates, the electric valve 9 that can cooperate unlatching together flat raft goes out a large amount of steam, also can when electric valve 9 is closed, guarantee enough steam circulations, and guarantee that with this outer shell 3 temperature maintain certain level, reduce the differential expansion of 3 of Inner cylinder 4 and outer shells.In practical operation, can adjust according to actual conditions the size in steam retaining ring 7 gaps, and cooperate electric valve 9 to satisfy outer shell 3 temperature to the demand of steam flow, all should be considered as specific embodiment of the utility model.
Claims (7)
1. steam turbine high-pressure cylinder jacket steam flow control device, comprise shell and be built in the rotor (1) that rotates in the shell, be provided with nozzle box (2) between the end of shell and rotor (1), described shell comprises outer shell (3) and is plugged on Inner cylinder (4) in the outer shell (3), and form interlayer (5) between the two, leave steam work done passage (14) between described Inner cylinder (4) and rotor (1), it is characterized in that described Inner cylinder (4) and the joint of rotor (1) are provided with a shaft seal (6), be respectively equipped with steam retaining ring (7) and the packing (11) of coupling between the end of described Inner cylinder (4) and outer shell (3), and between steam retaining ring (7) and packing (11), form a steam flow channel (13), described steam retaining ring (7) is provided with honeycomb duct (8) near outer shell (3) sidewall of interlayer (5) one sides, and described honeycomb duct (8) is provided with an electric valve (9).
2. a kind of steam turbine high-pressure cylinder jacket steam flow control device according to claim 1 is characterized in that the gap of described steam flow channel (13) is less than 3 millimeters.
3. a kind of steam turbine high-pressure cylinder jacket steam flow control device according to claim 1, the front end that it is characterized in that described outer shell (3) has placed a steam inlet pipe (10), and an end of described steam inlet pipe (10) passes Inner cylinder (4) and is communicated with described nozzle box (2).
4. a kind of steam turbine high-pressure cylinder jacket steam flow control device according to claim 1, it is characterized in that described steam retaining ring (7) dorsad outer shell (3) sidewall of nozzle box's (2) one sides be provided with an outlet pipe (12), described outlet pipe (12) is interconnected with interlayer (5), steam work done passage (14) respectively.
5. a kind of steam turbine high-pressure cylinder jacket steam flow control device according to claim 1, it is characterized in that described honeycomb duct (8) one ends are provided with 2 branches, and branch end is connected with the upper lower wall surface of described outer shell (3) respectively, is connected with described electric valve (9) after the other end converges.
6. a kind of steam turbine high-pressure cylinder jacket steam flow control device according to claim 1 is characterized in that described shaft seal (6) one ends are communicated with interlayer (5), and the other end is communicated with nozzle box (2), and near described nozzle box (2).
7. a kind of steam turbine high-pressure cylinder jacket steam flow control device according to claim 6 is characterized in that described electric valve (9) is completely open and close formula valve, and controlled by the controller of steam turbine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220372220 CN202832677U (en) | 2012-07-30 | 2012-07-30 | Steam flow control device for high pressure cylinder interlayer of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220372220 CN202832677U (en) | 2012-07-30 | 2012-07-30 | Steam flow control device for high pressure cylinder interlayer of steam turbine |
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| Publication Number | Publication Date |
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| CN202832677U true CN202832677U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220372220 Expired - Lifetime CN202832677U (en) | 2012-07-30 | 2012-07-30 | Steam flow control device for high pressure cylinder interlayer of steam turbine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481604A (en) * | 2014-12-16 | 2015-04-01 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure cylinder interlayer heating system |
| CN103953401B (en) * | 2014-04-30 | 2015-04-29 | 国投钦州发电有限公司 | High-and-medium pressure cylinder of steam turbine for thermal power plant |
| CN106014504A (en) * | 2016-07-05 | 2016-10-12 | 西安西热节能技术有限公司 | Steam cylinder interlayer structure |
| CN106194284A (en) * | 2016-07-22 | 2016-12-07 | 东方电气集团东方汽轮机有限公司 | A kind of steam turbine jacket steam parameter adjustment and the method for operation |
| CN110985142A (en) * | 2019-12-16 | 2020-04-10 | 上海电气电站设备有限公司 | Intelligent auxiliary system for starting and stopping steam turbine and temperature control method |
-
2012
- 2012-07-30 CN CN 201220372220 patent/CN202832677U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953401B (en) * | 2014-04-30 | 2015-04-29 | 国投钦州发电有限公司 | High-and-medium pressure cylinder of steam turbine for thermal power plant |
| CN104481604A (en) * | 2014-12-16 | 2015-04-01 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure cylinder interlayer heating system |
| CN104481604B (en) * | 2014-12-16 | 2016-03-23 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure cylinder interlayer heating system |
| CN106014504A (en) * | 2016-07-05 | 2016-10-12 | 西安西热节能技术有限公司 | Steam cylinder interlayer structure |
| CN106194284A (en) * | 2016-07-22 | 2016-12-07 | 东方电气集团东方汽轮机有限公司 | A kind of steam turbine jacket steam parameter adjustment and the method for operation |
| CN110985142A (en) * | 2019-12-16 | 2020-04-10 | 上海电气电站设备有限公司 | Intelligent auxiliary system for starting and stopping steam turbine and temperature control method |
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Address after: 310003 Hangzhou City, Fung Fung Road, No. Guoxin real estate building, building 15, building 108 Patentee after: ZHEJIANG ENERGY R & D INSTITUTE Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310052 Binjiang District Binsheng Road No. 1751 building second floor zheneng Patentee before: Zhejiang Zheneng Energy Technology Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
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| CX01 | Expiry of patent term |