CN104895629A - Method for transforming condensed steam type turbine generator unit into back pressure type unit - Google Patents
Method for transforming condensed steam type turbine generator unit into back pressure type unit Download PDFInfo
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Abstract
The invention discloses a method for transforming a condensed steam type turbine generator unit into a back pressure type unit. The condensed steam type turbine generator unit comprises a high-pressure cylinder, a middle-pressure cylinder, a low-pressure cylinder, a steam condenser of the low-pressure cylinder and a generator which are arranged in sequence and further comprises a boiler matched with the condensed steam type turbine generator unit. The method comprises the steps of dismounting the low-pressure cylinder and the steam condenser of the low-pressure cylinder, adding the middle-pressure cylinder at the pit base, defining an original middle-pressure cylinder as A, defining the newly added middle-pressure cylinder as B, directly connecting the tail end of the middle-pressure cylinder B to the generator, and forming hot steam extraction ports in the tail end of the middle-pressure cylinder A and the middle-pressure cylinder B to enable to the unit to become the back pressure type unit. A thermodynamic system adopts a primary re-heating mode, high-pressure exhausted steam is re-heated and meanwhile is fed into the middle-pressure cylinder A and the middle-pressure cylinder B to continuously do work, and middle-pressure exhausted steam is directly delivered to a heat user. The boiler is improved to increase steam parameters or expand the capacity of the boiler, and the adaptability of a steam turbine is improved.
Description
Technical field
The invention belongs to thermal power generating technology field, relate to Retrofitting Cogeneration Power Plants, specifically, is a kind of method condensing steam turbine generator group being transform as back pressure type unit.
Background technique
Traditional condensing steam turbine generator group, because its thermal efficiency is low, the serious energy-saving and emission-reduction policy existing with country of thermo-pollution, Environment Protection Policy conflict day by day, must be transformed, otherwise will be forced to stop transport, suffer exit.
The reason that condensed steam type generatine set heat efficiency is low, thermo-pollution is serious the exhaust steam after acting will be condensed into water and return boiler producing steam again, and the heat that exhaust steam is contained is wasted, and cool this exhaust steam and also will consume the energy, therefore the thermal efficiency is low; In condensation process, cooling medium distributes heat in atmosphere again, causes thermo-pollution to environment.Visible, the key of problem is for an outlet that can provide utilization is found in exhaust steam.
This outlet provides heating with exhaust steam to city dweller exactly, it not only Shi Lao thermoelectricity plant escape by the misfortune of closing down, also profit gangster is shallow, benefit double.Further, also extract part medium pressure steam, provide industrial heating to industrial user.
External heat supply just needs the back pressure improving unit, could meet the pressure requirements of heating steam, and the unit that improve back pressure through transformation is called back pressure unit traditionally.
Current modification scheme is: for heating, removes vapour condenser and low pressure flow passage or last several acting level, improves the pressure of low pressure steam discharge, and extract low pressure steam discharge to city heat supply, low pressure rotor retains; For industrial heating, directly extract medium pressure steam, to industrial heat user heat supply in the through-flow appropriate stage-number of middle pressure; For adapting to draw gas operating mode, also adaptation to be done to steam turbine.
Self-evident, external heat supply must sacrificial section generated output, and the rated power of actual power power and nominal greatly differs from each other, and truly can not reflect the electric motor power of power plant, be unfavorable for dispatching of power netwoks.
Although done adaptation to steam turbine, steam parameter has not changed, and unit hear rate is still very high.
In addition, after removing vapour condenser and low pressure flow passage, low pressure rotor is still retained, and there is action of blast, cause damage to its Security during the level of removing is secondary; In addition, its foundation ditch is idle, capital construction facility depreciation still entering cost, and because vapour condenser is bulky, floor space is very large, and this part cost is quite a few, and becoming power plant's improve effects has problem to be solved.
Summary of the invention
For above problem, the invention provides a kind of method condensing steam turbine generator group being transform as back pressure type unit, with the unit of the method transformation, generated output improves about 10%, close with the rated power of nominal, and hear rate reduces, the former foundation ditch of low pressure (LP) cylinder is utilized, and its technical solution is as follows:
A kind of method condensing steam turbine generator group being transform as back pressure type unit, described condensing steam turbine generator group comprise be disposed in order high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and vapour condenser thereof, generator, and supporting boiler with it, its remodeling method comprises following technical measures:
-remove low pressure (LP) cylinder and vapour condenser thereof, set up an intermediate pressure cylinder in its foundation ditch position, defining former intermediate pressure cylinder is A, and newly-increased intermediate pressure cylinder is B, the direct connecting generator of tail end of intermediate pressure cylinder B; Open heat supply bleeding point respectively at the tail end of intermediate pressure cylinder A and intermediate pressure cylinder B, make machine consist of back pressure type unit;
-thermodynamic system adopts single reheat mode, and high pressure steam discharge is sent into intermediate pressure cylinder A and intermediate pressure cylinder B simultaneously and continued acting after reheating, and in directly extracting, pressure vapour is sent to heat user;
-one of as follows transformation boiler
A, vapor pressure temperature is promoted to subcritical by ultrahigh pressure;
B, in the constant situation of temperature, pressure to boiler dilatation, increase steam flow;
C, both promote vapor pressure temperature, expand boiler capacity again;
And adaptation is done to steam turbine.
Rated power >=the 200MW of described condensing steam turbine generator group.
Feed water pump is arranged in generator tail end by described improved back pressure type steam turbine generator set, is driven by generator shaft; Between generator and feed water pump, be provided with speed changer, the torque that generator provides is through speed change rear driving feed water pump.
Beneficial effect of the present invention:
Transform example as with 200MW condensing steam turbine generator group, by above-mentioned transformation, the generated output of unit improves 10%, 220MW grade is brought up to after 200MW grade condensed steam type Transformation of Unit, output power 207MW, with former nominal rating power closely, be beneficial to dispatching of power netwoks.
The foundation ditch of former low pressure (LP) cylinder and vapour condenser thereof is able to Appropriate application, reduces the cost of power plant further, realizes maximizing the benefits.
Transform example as with 200MW condensing steam turbine generator group below, describe the present invention in detail.
Accompanying drawing explanation
Fig. 1 is 200MW condensing steam turbine generator set constructor and setting type figure
Fig. 2 is improved set configuration and setting type figure
Fig. 3 is the heat flow diagrams of improved unit.
Embodiment
First essential structure and the arrangement of 200MW condensing steam turbine generator group is introduced.
See Fig. 1, it comprise be disposed in order high-pressure cylinder 1, intermediate pressure cylinder 2, low pressure (LP) cylinder and vapour condenser 3 thereof, generator 4, and other supporting with it equipment.
Its remodeling method comprises following technical measures:
example one
-remove low pressure (LP) cylinder and vapour condenser thereof, set up an intermediate pressure cylinder 5 in its foundation ditch position, defining former intermediate pressure cylinder is A 2, and newly-increased intermediate pressure cylinder is B 5, the direct connecting generator 4 of tail end of intermediate pressure cylinder B 5; Open heat supply bleeding point respectively at the tail end of intermediate pressure cylinder A 2 and intermediate pressure cylinder B 5, make machine consist of back pressure type unit.
In addition, feed water pump 7 is arranged in the tail end of generator 4 by the present invention, by generator 4 main shaft drives.Between generator 4 and feed water pump 7, be provided with speed changer 6, the torque provided by generator 4 is through speed change rear driving feed water pump 7.
Improved set configuration and arrangement are shown in Fig. 2.
-transformation boiler, is promoted to subcritical by vapor pressure temperature by ultrahigh pressure; Steam parameter is promoted to 16.7MPa/537 DEG C/537 DEG C by 12.75MPa ~ 13.73MPa/535 DEG C ~ 537 DEG C/535 DEG C ~ 537 DEG C.And according to a conventional method adaptation is done to steam turbine.
-thermodynamic system adopts single reheat mode, and high pressure steam discharge is sent into intermediate pressure cylinder A 2 and intermediate pressure cylinder B 5 simultaneously and continued acting after reheating, and in directly extracting, pressure vapour is sent to heat user.
Steam discharge parameter is: 1.0MPa/397 DEG C, and extraction flow is 1116t/h.
See Fig. 3, the working procedure of unit: the 16.7MPa/537 DEG C of steam from boiler enters high-pressure cylinder 1, returns boiler reheater, be again heated to 537 DEG C after acting, enter intermediate pressure cylinder A 2 and intermediate pressure cylinder B 5 and continue acting, middle pressure vapour is directly sent to heat user.
After transformation, the generated output of unit brings up to 220MW grade, output power 207MW after improving 10%, 200MW grade condensed steam type Transformation of Unit, with former nominal rating power closely, be beneficial to dispatching of power netwoks.
example two
That during transformation boiler, do not promote vapor pressure temperature, but expand boiler capacity, increase steam flow, all the other are identical with example one with the difference of example one.Certainly, also can both promote vapor pressure temperature, expand boiler capacity again, also obtainable equivalent effect.
Technological scheme of the present invention is also applicable to the condensing steam turbine generator group transformation of more than 200MW grade.
Claims (4)
1. condensing steam turbine generator group is transform as the method for back pressure type unit by one kind, described condensing steam turbine generator group comprise be disposed in order high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder and vapour condenser thereof, generator, and supporting boiler with it, its remodeling method comprises following technical measures:
-remove low pressure (LP) cylinder and vapour condenser thereof, set up an intermediate pressure cylinder in its foundation ditch position, defining former intermediate pressure cylinder is A, and newly-increased intermediate pressure cylinder is B, the direct connecting generator of tail end of intermediate pressure cylinder B; Open heat supply bleeding point respectively at the tail end of intermediate pressure cylinder A and intermediate pressure cylinder B, make machine consist of back pressure type unit;
-thermodynamic system adopts single reheat mode, and high pressure steam discharge is sent into intermediate pressure cylinder A and intermediate pressure cylinder B simultaneously and continued acting after reheating, and in directly extracting, pressure vapour is sent to heat user;
-one of as follows transformation boiler
A, vapor pressure temperature is promoted to subcritical by ultrahigh pressure;
B, in the constant situation of temperature, pressure to boiler dilatation, increase steam flow;
C, both promote vapor pressure temperature, expand boiler capacity again;
And adaptation is done to steam turbine.
2. the method for claim 1, is characterized in that, the rated power >=200MW of described extrqaction condendsing turbine turbine generator group.
3. the method for claim 1, is characterized in that, feed water pump is arranged in generator tail end by described improved back pressure type steam turbine generator set, is driven by generator shaft.
4. method as claimed in claim 3, it is characterized in that, between generator and feed water pump, be provided with speed changer, the torque that generator provides is through speed change rear driving feed water pump.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106870033A (en) * | 2015-12-14 | 2017-06-20 | 上海电气电站设备有限公司 | Cogeneration double-extract steam turbine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963075A (en) * | 2010-09-10 | 2011-02-02 | 山东泓奥电力科技有限公司 | Method for changing pure condensation into back pressure heat supply |
| DE102013005863A1 (en) * | 2013-04-08 | 2014-10-09 | RERUM COGNITIO Gesellschaft für Marktintegration deutscher Innovationen und Forschungsprodukte mbH | Steam / work process with gas and steam turbines for external combustion for electric power generation in the cycle |
| CN204299632U (en) * | 2014-11-21 | 2015-04-29 | 华电国际电力股份有限公司技术服务中心 | For back pressure machine acting and the heating arrangement of Steam Turbine Through IP Admission steam discharge heating network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963075A (en) * | 2010-09-10 | 2011-02-02 | 山东泓奥电力科技有限公司 | Method for changing pure condensation into back pressure heat supply |
| DE102013005863A1 (en) * | 2013-04-08 | 2014-10-09 | RERUM COGNITIO Gesellschaft für Marktintegration deutscher Innovationen und Forschungsprodukte mbH | Steam / work process with gas and steam turbines for external combustion for electric power generation in the cycle |
| CN204299632U (en) * | 2014-11-21 | 2015-04-29 | 华电国际电力股份有限公司技术服务中心 | For back pressure machine acting and the heating arrangement of Steam Turbine Through IP Admission steam discharge heating network |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106870033A (en) * | 2015-12-14 | 2017-06-20 | 上海电气电站设备有限公司 | Cogeneration double-extract steam turbine |
| CN106870033B (en) * | 2015-12-14 | 2019-04-19 | 上海电气电站设备有限公司 | Cogeneration double-extract steam turbine |
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