CN201826901U - Reheat type back pressure steam turbine - Google Patents
Reheat type back pressure steam turbine Download PDFInfo
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- CN201826901U CN201826901U CN2010205544235U CN201020554423U CN201826901U CN 201826901 U CN201826901 U CN 201826901U CN 2010205544235 U CN2010205544235 U CN 2010205544235U CN 201020554423 U CN201020554423 U CN 201020554423U CN 201826901 U CN201826901 U CN 201826901U
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Abstract
The utility model provides a reheat type back pressure steam turbine. The traditional reheat type condensing steam turbine is transformed, a low-pressure cylinder and a low-pressure rotor are removed and the structures of other parts are not changed, and a heat supply pipeline of which one end is directly connected with the connector of a steam exhaust pipeline of a middle-pressure cylinder is additionally arranged. Moreover, a barring gear is additionally arranged and is arranged in the middle of a short shaft, one end of the short shaft is connected with one end of a middle-pressure rotor, and the other end of the short shaft is connected with a rotor of an electric generator; or the barring gear is arranged at the tail end of the middle-pressure rotor. A back-pressure safety valve device is arranged on the pipeline between the steam exhaust pipeline of the middle-pressure cylinder and the heat supply pipeline. In the utility model, the transformation working quantity is less, the transformation period is short, the transformation expense is low, the generated output of the unit is increased remarkably and the energy-saving effect is good. The condensing steam turbine and the steam-extraction condensing steam turbine including a three-cylinder two-exhaust and two-cylinder two-exhaust structures are suitable to be transformed.
Description
Technical field
The utility model relates to a kind of reheat type back pressure turbine of cogeneration of heat and power, relates in particular to the 125MW level and 200MW ultrahigh pressure condensing steam turbine is transformed into the reheat type back pressure turbine.
Background technique
Steam turbine is one of the three big capital equipments in thermal power plant, and it is made up of cylinder and rotor two large divisions, and rotor is positioned at cylinder, and rotor center is a main shaft, on the axle impeller is housed, and impeller outer edge is equipped with movable vane, and cylinder internal has some dividing plates, studs with stator blade on the dividing plate.The Turbo-generator Set of ultrahigh pressure and above parameter all adopts single reheat, and its structure is divided into high-pressure cylinder, intermediate pressure cylinder and low pressure (LP) cylinder, and low pressure (LP) cylinder is generally done paired minute double-flow design.135MW level and 200MW ultrahigh pressure condensing steam turbine generator group are the main thermal power generation units of China during 1980 to 2005, One's name is legion, the structure of 200MW steam turbine is divided into high-pressure cylinder, intermediate pressure cylinder and to minute low pressure (LP) cylinder of double fluid, be called three cylinders, two exhaust turbines, the 135MW level steam turbine is made cylinder combined structure with high-pressure cylinder and intermediate pressure cylinder, be called the two-cylinder two-exhaust steam turbine, the initial steam parameter of superhigh pressure turbine is 535 ℃ of pressure 12.75～13.24MPa, temperature, because of steam inlet condition lower, the thermal efficiency of steam turbine is lower, and the unit generation coal consumption is higher.
Deep propelling along with national energy-saving and emission-reduction policy, 135MW level ultrahigh pressure condensing steam turbine generator group by 600, super (surpassing) critical unit substitutes 1000MW, 200MW ultrahigh pressure condensing steam turbine generator group also will progressively be substituted, some just is constructed and put into operation these units the several years, reach its working life far away, how rationally to utilize becomes current new problem.Part power plant has carried out the heat supply transformation to it, and modification scheme is to install butterfly valve additional on the mesolow unicom pipeline that connects intermediate pressure cylinder and low pressure (LP) cylinder, arranges the heat supply extraction line before butterfly valve, and steam turbine promptly is transformed into the condensing steam turbine that draws gas.The shortcoming of this modification scheme is: the one, and low pressure (LP) cylinder still need be guaranteed certain steam through-current capacity, with cooled blade, therefore, the heat loss that enters the steam of vapour condenser still exists; The 2nd, because of the low pressure (LP) cylinder inlet flow rate significantly reduces, inlet pressure obviously reduces, steam acting ability drop, simultaneously because of movable vane inlet flow velocity substantial deviation design load, the internal efficiency of low pressure (LP) cylinder is significantly reduced, and the steam enthalpy that enters vapour condenser obviously increases, and the condensation loss of specific discharge increases; The 3rd, because of the shunting of low pressure (LP) cylinder, its heat capacity is restricted.
The back pressure type steam turbine generator set or the back pressure type steam turbine generator set that draws gas are a kind of main types of cogeneration of heat and power.Under the prerequisite of identical heating load, back pressure turbine is along with the raising of steam parameter, and the increase of exerting oneself of unit has enlarged the energy-saving effect of back pressure unit effectively; Therefore, improve the steam initial conditions and remain the valid approach that improves the back pressure turbine energy-saving effect.At present, it is that pressure 8.83MPa, 535 ℃ of temperature, capacity reach 75MW that China's back pressure turbine has developed into the initial steam parameter, is the single-cylinder structure.As the steam initial conditions being increased to ultrahigh pressure and above parameter, when heating steam pressure was low, the approaching or temperature that reaches capacity of heating steam can not satisfy the production needs of enterprise, only is suitable for heating; Simultaneously since the acting enthalpy drop of unit steam flow only higher temperatures high pressure unit is slightly high, the increasing degree of unit capacity is less, the input and output of enterprise are disproportionate, thereby further developing of back pressure turbine is faced with bottleneck.
Be that a large amount of assets are left unused on the one hand, enterprise is great amount of investment, the lower back pressure unit of construction parameter on the other hand, if can be with both combinations, the ultrahigh pressure unit is transformed into the back pressure unit carries out heat supply, not only can save a large amount of investments, and because of steam parameter is higher, exerting oneself of Turbo-generator Set significantly increases, and energy-saving effect is remarkable.
Summary of the invention
The purpose of this utility model is: vitalize a large amount of idle assets such as the 135MW level of closing down and 200MW ultrahigh pressure Turbo-generator Set, transform former ultrahigh pressure condensing steam turbine as the reheat type back pressure turbine, substitute newly-built back pressure turbine or extraction back pressure turbine
The purpose of this utility model realizes by following scheme: traditional reheat type condensing steam turbine is transformed, removed low pressure (LP) cylinder and low pressure rotor, do not change the other parts structure, increase the heat supply pipeline that an end directly is connected with intermediate pressure cylinder blow-off line interface simultaneously.
The utility model also has additional barring gear, and barring gear is installed in the middle of the minor axis, and an end of minor axis is connected with an end of middle pressure rotor, and the other end is connected with generator amature; Or press the end of rotor during barring gear is installed in.
The utility model also has additional the back pressure relief valve device on the pipeline between intermediate pressure cylinder blow-off line and heat supply pipeline.
The utility model improvement project amount is few, and the transformation cycle is short, and improvement expenses is low, and unit generation is exerted oneself obviously to be increased, and energy-saving effect is better.Be fit to the condensed steam type and the condensing steam turbine transformation of drawing gas, comprise three cylinders, two steam discharges and two-cylinder two-exhaust structure, the steam discharge parameter of its intermediate pressure cylinder is the initial parameters of steam turbine heat supply, the steam turbine that the declared working condition exhaust steam pressure is lower is suitable for heating very much, the production heat supply that then is suitable for enterprise that exhaust steam pressure is higher.
Description of drawings
Fig. 1 is traditional reheat type condensing steam turbine structural representation;
Fig. 2 is the utility model embodiment 1 structural representation;
Fig. 3 is the utility model embodiment 2 structural representations.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the utility model is elaborated.
Present embodiment is transformed traditional reheat type condensing steam turbine, removed low pressure (LP) cylinder 3 and low pressure rotor 6, specifically constituted by high-pressure cylinder 1, intermediate pressure cylinder 2, high pressure rotor 4, middle pressure rotor 5, generator amature 7, boiler 8, main steam line 9, cold reheat pipe road 10, reheat heat pipeline 11, intermediate pressure cylinder blow-off line 12, back pressure relief valve device 15, minor axis 16, barring gear 13 and heat supply pipeline 14.High pressure rotor 4, in press rotor 5 to link by coupling, main steam line 9 is connected between the main inlet throttle-stop valve import of the superheater outlet of boiler 8 and high-pressure cylinder 1, cold reheat pipe road 10 is connected between the steam-expelling port of the reheater import of boiler 8 and high-pressure cylinder 1, reheat heat pipeline 11 is connected between the combined emergency stop and governing valve import of the reheater outlet of boiler 8 and intermediate pressure cylinder 2, barring gear 13 is installed in the middle of the minor axis 16, one end of minor axis 16 is connected with an end of middle pressure rotor 5, the other end is connected with the generator amature 7 of generator M, is provided with back pressure relief valve device 15 on the pipeline of 14 of intermediate pressure cylinder blow-off line 12 and heat supply pipelines.
Present embodiment high-pressure cylinder 1 closes the cylinder setting with intermediate pressure cylinder 2, and high pressure rotor 4 merges setting with middle pressure rotor 5, presses the end of rotor 5 during barring gear 13 is installed in, and other structure is identical with embodiment 1.
Experimental example 1: the 2 * 135MW of Shanxi power plant direct air-cooling turbine enforcement the utility model front and back of Shanghai steam turbine plant production reach and the performance of certain 75MW back pressure turbine compares.Relatively under the prerequisite based on identical heating load, identical return water temperature, rejected the thermal discharge of cinder cooling device during Efficiency Calculation.The utility model steam turbine improves 27.9% than exerting oneself of back pressure turbine, per hour can spend by multiple electricity 21318.9, by the mark coal consumption 330 gram/degree calculating of on average powering of 135 days heating phases, electrical network, after the electricity consumption of deduction power plant self, about 6824.5877 ten thousand degree of can powering every year are saved 15654.475 tons of standard coals more.
Experimental example 2: the performance with certain 50MW back pressure turbine behind the 2 * 135MW of Shandong power plant steam turbine enforcement the utility model that the Shanghai steam turbine plant is produced compares.Relatively under the prerequisite based on identical heat supply flow, identical moisturizing temperature, the utility model steam turbine improves 21.5% than exerting oneself of back pressure turbine, per hour can spend by multiple electricity 11131.53, move 7600 hours per year, electrical network is on average powered the calculating of mark coal consumption 330 gram/degree, after the electricity consumption of deduction power plant self, about 8291.415 ten thousand degree of can powering every year are saved 15925.073 tons of standard coals more.
Experimental example 3: the performance that the 2 * 200MW of the Shandong power plant steam turbine that northern heavy steam turbine plant is produced is implemented before and after the utility model compares.
The performance comparison sheet of steam turbine before and after the utility model is implemented
Annotate: above-mentioned three examples are all calculated by generator efficiency 98%, efficiency of boiler 90%, pipeline efficient 99%, all do not consider the radiation loss of each heater.
Claims (3)
1. reheat type back pressure turbine, comprise high-pressure cylinder, intermediate pressure cylinder, high pressure rotor, the middle rotor of pressing, generator amature, boiler, main steam line, the cold reheat pipe road, the reheat heat pipeline, the intermediate pressure cylinder blow-off line, minor axis, high pressure rotor, the middle rotor of pressing links by coupling, main steam line is connected between the main inlet throttle-stop valve import of the superheater outlet of boiler and high-pressure cylinder, the cold reheat pipe road is connected between the steam-expelling port of the reheater import of boiler and high-pressure cylinder, the reheat heat pipeline is connected between the combined emergency stop and governing valve import of the reheater place mouth of boiler and intermediate pressure cylinder, it is characterized in that: also comprise the heat supply pipeline that an end directly is connected with intermediate pressure cylinder blow-off line interface.
2. reheat type back pressure turbine according to claim 1 is characterized in that: set up barring gear, barring gear is installed in the middle of the minor axis, and an end of minor axis is connected with an end of middle pressure rotor, and the other end is connected with generator amature; Or press the end of rotor during barring gear is installed in.
3. reheat type back pressure steamer according to claim 1 and 2 is characterized in that: be provided with the back pressure relief valve device on the pipeline between intermediate pressure cylinder blow-off line and heat supply pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205544235U CN201826901U (en) | 2010-10-09 | 2010-10-09 | Reheat type back pressure steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205544235U CN201826901U (en) | 2010-10-09 | 2010-10-09 | Reheat type back pressure steam turbine |
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| Publication Number | Publication Date |
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| CN201826901U true CN201826901U (en) | 2011-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010205544235U Expired - Fee Related CN201826901U (en) | 2010-10-09 | 2010-10-09 | Reheat type back pressure steam turbine |
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| CN (1) | CN201826901U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400719A (en) * | 2011-11-28 | 2012-04-04 | 北京北重汽轮电机有限责任公司 | Heating and heat supply cogeneration steam turbine |
| CN103790643A (en) * | 2014-02-11 | 2014-05-14 | 上海电气电站设备有限公司 | Method for improving steam exhaust parameters of turbine |
| CN105909327A (en) * | 2016-06-16 | 2016-08-31 | 北京龙威发电技术有限公司 | Novel industrial steam pumping and heat supplying system of steam turbine |
| CN107202355A (en) * | 2017-06-06 | 2017-09-26 | 大唐东北电力试验研究所有限公司 | High back pressure birotor electric heating unit heating system |
| CN109653818A (en) * | 2018-11-30 | 2019-04-19 | 东方电气集团东方汽轮机有限公司 | A kind of two-stage back pressure machine reheating extraction for heat supply System and method for |
-
2010
- 2010-10-09 CN CN2010205544235U patent/CN201826901U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400719A (en) * | 2011-11-28 | 2012-04-04 | 北京北重汽轮电机有限责任公司 | Heating and heat supply cogeneration steam turbine |
| CN103790643A (en) * | 2014-02-11 | 2014-05-14 | 上海电气电站设备有限公司 | Method for improving steam exhaust parameters of turbine |
| CN103790643B (en) * | 2014-02-11 | 2015-08-19 | 上海电气电站设备有限公司 | A kind of method improving turbine discharge parameter |
| CN105909327A (en) * | 2016-06-16 | 2016-08-31 | 北京龙威发电技术有限公司 | Novel industrial steam pumping and heat supplying system of steam turbine |
| CN107202355A (en) * | 2017-06-06 | 2017-09-26 | 大唐东北电力试验研究所有限公司 | High back pressure birotor electric heating unit heating system |
| CN109653818A (en) * | 2018-11-30 | 2019-04-19 | 东方电气集团东方汽轮机有限公司 | A kind of two-stage back pressure machine reheating extraction for heat supply System and method for |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20131009 |