CN203835469U - Turbine low-pressure shaft seal steam supply system - Google Patents
Turbine low-pressure shaft seal steam supply system Download PDFInfo
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- CN203835469U CN203835469U CN201420270531.8U CN201420270531U CN203835469U CN 203835469 U CN203835469 U CN 203835469U CN 201420270531 U CN201420270531 U CN 201420270531U CN 203835469 U CN203835469 U CN 203835469U
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Abstract
The utility model relates to the steam power engineering and specifically relates to a turbine low-pressure shaft seal steam supply system. The turbine low-pressure shaft seal steam supply system is characterized by comprising a shaft seal steam supply header and at least one low-pressure shaft seal steam supply cooling device, wherein the shaft seal steam supply header is communicated with a steam leakage pipeline of a high-pressure cylinder rear steam seal and a steam leakage pipeline of a medium-pressure cylinder rear steam seal; the steam outlet of the shaft seal steam supply header is connected with the steam discharge chambers of a low-pressure cylinder front shaft seal and a low-pressure cylinder rear shaft seal by virtue of a first shaft seal header steam supply valve; the at least one low-pressure shaft seal steam supply cooling device is used for cooling the gas in the steam discharge chambers. The turbine low-pressure shaft seal steam supply system has the advantages that the low-pressure shaft seal steam supply cooling device arranged in the steam discharge chamber of the low-pressure cylinder is arranged so that the system is capable of reducing the steam leakage temperature of the shaft seal to the desired level by use of turbine waste steam, and therefore, the stability of the low-pressure shaft seal steam supply temperature is guaranteed and the safety and the economic efficiency of unit operations are improved.
Description
Technical field
The utility model relates to steam-power engineering, is specifically related to a kind of steam feeding of low-pressure shaft seal in turbine system.
Background technique
Steam turbine is a kind of taking steam as power, and the heat energy of steam is converted into the rotating power machinery of mechanical work, is most widely used prime mover in modern thermal power plant.It has the advantages such as single-machine capacity is large, efficiency is high, the life-span is long, main prime mover as generating use, also can directly drive various pumps, blower fan, compressor and propeller for vessels etc., can also utilize the steam discharge of steam turbine or intermediate extraction to meet production and heat supply needs in life.
Under normal circumstances, the low voltage terminal of steam turbine is all equipped with shaft end gland seal, and it can reduce, and steam spills or air bleeds, and still can not eliminate completely but leak vapour phenomenon.In order to prevent and reduce normal start-stop and the operation of this leakage vapour phenomenon, guarantee unit, and recovery is leaked vapour and is utilized the energy of vapour, medium-loss and the heat loss of minimizing system, the mode that large-size steam turbine adopts high intermediate pressure cylinder gland packing leakage after spray desuperheating, low voltage terminal to be sealed at present of leaking more.
But, spray desuperheating is except unit economy is caused certain influence, cause the significantly variation of low pressure for stripping temperature if control improper meeting, cause Low Pressure Steam Turbine generation to touch mill vibration unit safety operation is produced and threatened, seriously time, can make generator set out of service.Most fired power generating unit shaft seal gap is bigger than normal, and Steam loss is bigger than normal, in the time that desuperheat injection flow rate is not enough, can makes high temperature gland packing leakage enter oil system and make Tubine Oil Mixed with Water, steam turbine oil emulsion deterioration; In the time that desuperheat injection flow rate is excessive, can make shaft seal steam band water, be unfavorable for unit safety operation.
Model utility content
(1) technical problem solving
For the deficiencies in the prior art, the utility model provides a kind of steam feeding of low-pressure shaft seal in turbine system, it mainly makes system gland packing leakage temperature to be down to desired level by exhaust steam in steam turbine to be arranged in the feeding of low-pressure shaft seal cooling unit of low pressure (LP) cylinder exhaust hood, ensure the stability of feeding of low-pressure shaft seal temperature, improved Security and the Economy of unit operation.
(2) technological scheme
For realizing above object, the utility model is achieved by the following technical programs:
A kind of steam feeding of low-pressure shaft seal in turbine system, is characterized in that, described system comprises shaft seal steam header and at least one feeding of low-pressure shaft seal cooling unit, wherein:
The leakage vapour pipeline communication of packing after the leakage steam pipe road of packing and intermediate pressure cylinder after described shaft seal steam header and high-pressure cylinder;
The steam ouput of described shaft seal steam header is connected by the first shaft seal header steam supply valve with the exhaust hood of shaft seal before low pressure (LP) cylinder and low pressure (LP) cylinder rear shaft seal;
Described at least one feeding of low-pressure shaft seal cooling unit is for the gas of cooling described exhaust hood.
Preferably, described shaft seal steam header and main vapour, for shaft seal pipeline connection, supply to be provided with main vapour for shaft seal valve on shaft seal pipeline at described main vapour.
Preferably, described shaft seal steam header and hotter cold junction, for shaft seal pipeline connection, supply to be provided with hot cold junction for shaft seal valve on shaft seal pipeline at described hot cold junction more again.
Preferably, described shaft seal steam header and auxiliary steam, for shaft seal pipeline connection, supply to be provided with auxiliary steam for shaft seal valve on shaft seal pipeline at described auxiliary steam.
Preferably, described system also comprises the low-pressure heater that is positioned at condensate pump outlet, and described low-pressure heater is communicated with described shaft seal steam header.
Preferably, between described shaft seal steam header and low-pressure heater, be provided with shaft seal steam relief valve.
Preferably, described system also comprises direct-contact desuperheater; The steam ouput of described shaft seal steam header is also connected by the second shaft seal header steam supply valve with described direct-contact desuperheater, and it goes out vapour and feeds the front shaft seal of low pressure (LP) cylinder and low pressure (LP) cylinder rear shaft seal.
Preferably, described direct-contact desuperheater and water of condensation cooling water pipeline connection are provided with water of condensation spray water valve on described water of condensation cooling water pipeline.
(3) beneficial effect
The utility model at least has following beneficial effect:
The steam feeding of low-pressure shaft seal in turbine system that the utility model proposes, has comprised feeding of low-pressure shaft seal cooling unit.For high pressure combined cylinder turbine, after steam turbine high-pressure cylinder, packing enters shaft seal steam header after mixing with gland leak-off after intermediate pressure cylinder.Normal operation period shaft seal steam can from header through shaft seal steam cooling unit be reduced to feed low pressure (LP) cylinder after temperature required before shaft seal and low pressure (LP) cylinder rear shaft seal, thereby reach the object of sealing.
Compared with prior art, adopt feeding of low-pressure shaft seal cooling unit gland packing leakage temperature to be down to desired level by exhaust steam in steam turbine, ensured the stability of feeding of low-pressure shaft seal temperature; And, during due to normal operation, do not need to carry out spray desuperheating, so the utility model has improved the Economy of unit operation.
On the whole, the utility model is simple in structure, economical and practical, can form from the basis transformation of existing feeding of low-pressure shaft seal system, also can be used for the design of newly-built steam turbine set, can effectively ensure safety, economy, the reliable operation of steam turbine set feeding of low-pressure shaft seal.
Certainly, implement arbitrary product of the present utility model and might not need to reach above-described all advantages simultaneously.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, accompanying drawing to required use in embodiment or description of the Prior Art being done to one below simply introduces, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural drawing of steam feeding of low-pressure shaft seal in turbine system in embodiment of the utility model.
In figure, 1---high-pressure cylinder, 2---intermediate pressure cylinder, 3---low pressure (LP) cylinder, 4---high-pressure cylinder rear shaft seal, 5---intermediate pressure cylinder rear shaft seal, 6---shaft seal before low pressure (LP) cylinder, 7---low pressure (LP) cylinder rear shaft seal, 8---shaft seal steam header, 9---shaft seal steam cooling unit before low pressure, 10---low pressure rear shaft seal steam supply cooling unit, 11---main vapour is for shaft seal pipeline, 12---hot cold junction is for shaft seal pipeline again, 13---auxiliary steam is for shaft seal pipeline, 14---main vapour is for shaft seal valve, 15---hot cold junction is for shaft seal valve again, 16---auxiliary vapour is for shaft seal valve, 17---the first shaft seal header steam supply valve, 18---the second shaft seal header steam supply valve, 19---direct-contact desuperheater, 20---water of condensation spray water valve, 21---water of condensation cooling water pipeline, 22---shaft seal steam relief valve, 23---the low-pressure heater of condensate pump outlet.
Embodiment
For making the utility model embodiment's object, technological scheme and advantage clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technological scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment who obtains under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment has proposed a kind of steam feeding of low-pressure shaft seal in turbine system, and referring to Fig. 1, described system comprises shaft seal steam header 8 and at least one feeding of low-pressure shaft seal cooling unit (9,10, in figure only taking two as example), wherein:
The leakage vapour pipeline communication of packing 5 after the leakage steam pipe road of packing 4 and intermediate pressure cylinder after described shaft seal steam header 8 and high-pressure cylinder; The steam ouput of described shaft seal steam header 8 is connected by the first shaft seal header steam supply valve 17 with the exhaust hood of shaft seal 6 before low pressure (LP) cylinder and low pressure (LP) cylinder rear shaft seal 7; Described at least one feeding of low-pressure shaft seal cooling unit 9 is for the gas of cooling described exhaust hood.
Comprise the feeding of low-pressure shaft seal system of said structure, can make packing after steam turbine high-pressure cylinder enter shaft seal steam header after mixing with gland leak-off after intermediate pressure cylinder, and normal operation period shaft seal steam can from header through shaft seal steam cooling unit be reduced to feed low pressure (LP) cylinder after temperature required before shaft seal and low pressure (LP) cylinder rear shaft seal, thereby reach the object of sealing.
And compared with prior art, adopt feeding of low-pressure shaft seal cooling unit gland packing leakage temperature to be down to desired level by exhaust steam in steam turbine, ensure the stability of feeding of low-pressure shaft seal temperature; And, during due to normal operation, do not need to carry out spray desuperheating, so the utility model has improved the Economy of unit operation.
Preferably, described shaft seal steam header 8 is communicated with for shaft seal pipeline 11 with main vapour, supplies to be provided with main vapour for shaft seal valve 14 on shaft seal pipeline 11 at described main vapour.
Preferably, described shaft seal steam header 8 is communicated with for shaft seal pipeline 12 with hot cold junction again, is provided with hot cold junction for shaft seal valve 15 at described hot cold junction again on for shaft seal pipeline 12 again.
Preferably, described shaft seal steam header 8 is communicated with for shaft seal pipeline 13 with auxiliary steam, supplies to be provided with auxiliary steam for shaft seal valve 16 on shaft seal pipeline 13 at described auxiliary steam.
Above-mentioned three kinds of shaft seal pipelines can steam turbine set start or low-load period between respectively with main steam, reheated steam cold junction and auxiliary steam supply shaft gland sealing steam supply, can be in the time can not meeting the demands for stripping temperature, by opening main vapour, improve for stripping temperature in other vapour source such as hot vapour, auxiliary vapour again, has further ensured shaft seal steam temperature and reliability.
Preferably, described system also comprises the low-pressure heater 23 that is positioned at condensate pump outlet, and described low-pressure heater 23 is communicated with described shaft seal steam header 8.More preferably, between described shaft seal steam header 8 and low-pressure heater 23, be provided with shaft seal steam relief valve 22.Said structure can be in the time that shaft seal steam amount be bigger than normal, makes unnecessary shaft seal steam can overflow into the low-pressure heater 23 that water of condensation is flowed through, thereby can reclaim a part of heat, has saved the energy, has improved the utilization ratio of the energy.
Preferably, described system also comprises direct-contact desuperheater 19; The steam ouput of described shaft seal steam header 8 is also connected by the second shaft seal header steam supply valve 18 with described direct-contact desuperheater 19, and it goes out vapour and feeds the front shaft seal 6 of low pressure (LP) cylinder and low pressure (LP) cylinder rear shaft seal 7.More preferably, described direct-contact desuperheater 19 is communicated with water of condensation cooling water pipeline 21, on described water of condensation cooling water pipeline 21, is provided with water of condensation spray water valve 20.Situation when this structure is applicable under specific operation can not meet the demands for stripping temperature, that is to say, in the time of steam supply temperature drift, can open spray desuperheating system temperature is adjusted, and has ensured the reliability of shaft seal steam temperature.
Steam feeding of low-pressure shaft seal in turbine system under comprehensive above-mentioned all optimum conditions, mark in corresponding diagram 1, has comprised the low-pressure heater 23 that high-pressure cylinder 1, intermediate pressure cylinder 2, low pressure (LP) cylinder 3, high-pressure cylinder rear shaft seal 4, intermediate pressure cylinder rear shaft seal 5, the front shaft seal 6 of low pressure (LP) cylinder, low pressure (LP) cylinder rear shaft seal 7, shaft seal steam header 8, the front shaft seal steam cooling unit 9 of low pressure, low pressure rear shaft seal steam supply cooling unit 10, direct-contact desuperheater 19 and condensate pump export.The specific works principle of this system is as follows:
At unit starting or between low-load period, in the time that high-pressure cylinder rear shaft seal 4 can not meet feeding of low-pressure shaft seal temperature requirement with the leakage vapour of intermediate pressure cylinder rear shaft seal 5, can open main vapour for shaft seal valve 14 in good time, hot cold junction is for shaft seal valve 15 again, auxiliary vapour is for shaft seal valve 16, the first shaft seal header steam supply valve 17, shaft seal steam relief valve 22, by main vapour for shaft seal pipeline 11 or hotter cold junction communicate with shaft seal steam header 8 for shaft seal pipeline 13 for shaft seal pipeline 12 or auxiliary steam, shaft seal steam is by the second shaft seal header steam supply valve 18, after direct-contact desuperheater 19, it goes out vapour and feeds respectively the front shaft seal 6 of low pressure (LP) cylinder, low pressure (LP) cylinder rear shaft seal 7, unnecessary shaft seal steam can enter by relief valve 22 the low-pressure heater 23 recovery section heats of condensate pump outlet.
In the time that unit normal operation period high-pressure cylinder rear shaft seal 4 can meet feeding of low-pressure shaft seal temperature requirement with the leakage vapour of intermediate pressure cylinder rear shaft seal 5, can close main vapour for shaft seal valve 14, hot cold junction is for shaft seal valve 15 again, auxiliary vapour is for shaft seal valve 16, communicated with shaft seal steam header 8 by the leakage steam pipe road of high-pressure cylinder rear shaft seal 4 and the leakage steam pipe road of intermediate pressure cylinder rear shaft seal 5, shaft seal steam cooling unit 9 before the steam ouput of shaft seal steam header 8 and low pressure, low pressure rear shaft seal steam supply cooling unit 10 is connected by the first shaft seal header steam supply valve 17, it goes out vapour and feeds respectively the front shaft seal 6 of low pressure (LP) cylinder, low pressure (LP) cylinder rear shaft seal 7, unnecessary shaft seal steam can enter by relief valve 22 the low-pressure heater 23 recovery section heats of condensate pump outlet, in the time that temperature does not meet the demands, can open the second shaft seal header steam supply valve 18, water of condensation spray water valve 20 in good time, drop into direct-contact desuperheater 19.
Compared with prior art, the beneficial effect that this system produces comprises:
1) adopt feeding of low-pressure shaft seal cooling unit to ensure the stability for stripping temperature;
2) while normally operation, do not need to carry out spray desuperheating, improved the Economy of unit operation;
3) first low-pressure heater of the excessive vapour access of shaft seal water of condensation being flowed through, has reclaimed a part of heat, has reached energy-conservation object;
On the whole, the utility model is simple in structure, economical and practical, can form from the basis transformation of existing feeding of low-pressure shaft seal system, also can be used for the design of newly-built steam turbine set, can effectively ensure safety, economy, the reliable operation of steam turbine set feeding of low-pressure shaft seal.
The utility model is a kind of steam feeding of low-pressure shaft seal in turbine system, can be used for the transformation of existing feeding of low-pressure shaft seal system, also can be used for newly-built steam turbine set, it is simple in structure, economical and practical, can effectively improve safety, economy, the reliable operation temperature of steam turbine set feeding of low-pressure shaft seal.
It should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or control panel, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make to comprise that the article of a series of key elements or equipment not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as this article or the intrinsic key element of equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within and comprise in the article of described key element or equipment and also have other identical element.
Above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technological scheme that still can record aforementioned each embodiment is modified, or part technical characteristics is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the each embodiment's technological scheme of the utility model.
Claims (8)
1. a steam feeding of low-pressure shaft seal in turbine system, is characterized in that, described system comprises shaft seal steam header and at least one feeding of low-pressure shaft seal cooling unit, wherein:
The leakage vapour pipeline communication of packing after the leakage steam pipe road of packing and intermediate pressure cylinder after described shaft seal steam header and high-pressure cylinder;
The steam ouput of described shaft seal steam header is connected by the first shaft seal header steam supply valve with the exhaust hood of shaft seal before low pressure (LP) cylinder and low pressure (LP) cylinder rear shaft seal;
Described at least one feeding of low-pressure shaft seal cooling unit is for the gas of cooling described exhaust hood.
2. system according to claim 1, is characterized in that, described shaft seal steam header and main vapour, for shaft seal pipeline connection, supply to be provided with main vapour for shaft seal valve on shaft seal pipeline at described main vapour.
3. system according to claim 1, is characterized in that, described shaft seal steam header and hotter cold junction, for shaft seal pipeline connection, supply to be provided with hot cold junction for shaft seal valve on shaft seal pipeline at described hot cold junction more again.
4. system according to claim 1, is characterized in that, described shaft seal steam header and auxiliary steam, for shaft seal pipeline connection, supply to be provided with auxiliary steam for shaft seal valve on shaft seal pipeline at described auxiliary steam.
5. system according to claim 1, is characterized in that, described system also comprises the low-pressure heater that is positioned at condensate pump outlet, and described low-pressure heater is communicated with described shaft seal steam header.
6. system according to claim 5, is characterized in that, between described shaft seal steam header and low-pressure heater, is provided with shaft seal steam relief valve.
7. according to the system described in any one in claim 1 to 6, it is characterized in that, described system also comprises direct-contact desuperheater; The steam ouput of described shaft seal steam header is also connected by the second shaft seal header steam supply valve with described direct-contact desuperheater, and it goes out vapour and feeds the front shaft seal of low pressure (LP) cylinder and low pressure (LP) cylinder rear shaft seal.
8. system according to claim 7, is characterized in that, described direct-contact desuperheater and water of condensation cooling water pipeline connection are provided with water of condensation spray water valve on described water of condensation cooling water pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420270531.8U CN203835469U (en) | 2014-05-23 | 2014-05-23 | Turbine low-pressure shaft seal steam supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420270531.8U CN203835469U (en) | 2014-05-23 | 2014-05-23 | Turbine low-pressure shaft seal steam supply system |
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| CN203835469U true CN203835469U (en) | 2014-09-17 |
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| CN201420270531.8U Active CN203835469U (en) | 2014-05-23 | 2014-05-23 | Turbine low-pressure shaft seal steam supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN107725119A (en) * | 2017-12-06 | 2018-02-23 | 中国船舶重工集团公司第七0三研究所 | A kind of nested type packing balanced structure of high-pressure chamber |
| JP2018155247A (en) * | 2017-03-20 | 2018-10-04 | ドゥサン ヘヴィー インダストリーズ アンド コンストラクション カンパニー リミテッド | Ceiling gas supply device |
-
2014
- 2014-05-23 CN CN201420270531.8U patent/CN203835469U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018155247A (en) * | 2017-03-20 | 2018-10-04 | ドゥサン ヘヴィー インダストリーズ アンド コンストラクション カンパニー リミテッド | Ceiling gas supply device |
| US11136898B2 (en) | 2017-03-20 | 2021-10-05 | Doosan Heavy Industries & Construction Co., Ltd. | Sealing gas supply apparatus |
| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN107246284B (en) * | 2017-06-27 | 2019-03-29 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of the extra-supercritical unit containing electric heater |
| CN107725119A (en) * | 2017-12-06 | 2018-02-23 | 中国船舶重工集团公司第七0三研究所 | A kind of nested type packing balanced structure of high-pressure chamber |
| CN107725119B (en) * | 2017-12-06 | 2024-01-12 | 中国船舶重工集团公司第七0三研究所 | Nested vapor seal balance structure of high-pressure chamber |
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