CN110821585A - Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof - Google Patents
Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof Download PDFInfo
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- CN110821585A CN110821585A CN201911178065.4A CN201911178065A CN110821585A CN 110821585 A CN110821585 A CN 110821585A CN 201911178065 A CN201911178065 A CN 201911178065A CN 110821585 A CN110821585 A CN 110821585A
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- heat source
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/40—Use of two or more feed-water heaters in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/02—Blade-carrying members, e.g. rotors
- F01D5/06—Rotors for more than one axial stage, e.g. of drum or multiple disc type; Details thereof, e.g. shafts, shaft connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Architecture (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a condensing and back-pumping integrated system based on a back pressure heat supply technology and application thereof.A middle pressure cylinder is communicated with a low pressure cylinder through a first pipeline; the intermediate pressure cylinder is connected with the high-temperature heat source heater through a second pipeline, the low pressure cylinder is communicated with the low-temperature heat source heater through a third pipeline, a water path of the heat supply network circulating water supply system sequentially passes through the high-temperature heat source heater and the low-temperature heat source heater, and water in the water path circularly flows from the low-temperature heat source heater to the high-temperature heat source heater. To under the high back pressure operation mode of steam turbine, low pressure jar exhaust temperature rises, the inflation volume increases to the change of operating condition such as condenser heat supply network recirculated cooling water operating pressure is higher, redesigns the condenser body, has avoided shutting down twice each year and has changed the low pressure jar rotor, what adopt be a adaptable and winter, summer broad operation backpressure scope novel low pressure jar rotor scheme, avoided changing the low pressure rotor after this system operation.
Description
Technical Field
The invention relates to the field of heat supply energy-saving upgrading and reconstruction, in particular to a condensation and back-extraction integrated system based on a backpressure heat supply technology and application thereof.
Background
At present, a double-rotor interchange scheme is generally adopted in domestic high-back-pressure heat supply transformation, namely a low-pressure rotor adaptive to high-back-pressure operation is adopted in a heat supply period, and a rotor in pure condensation operation is replaced in a non-heating period. The load rate of the unit is not high in the non-heating period, the low-pressure cylinder rotor is replaced by shutting down twice every year, the operation is complex, a large amount of manpower and material resources are wasted, and the economic operation cost is high. At present, a condensation and back extraction integrated system based on a back pressure heat supply technology and application thereof are not reported.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a back-pressure heating technology-based back-pressure condensation and extraction integrated system and an application thereof, so as to reduce the unit operation cost.
In order to solve the technical problems, the technical scheme of the invention comprises the following steps:
a condensing and back-pumping integrated system based on a back pressure heat supply technology comprises a medium pressure cylinder and a low pressure cylinder, wherein the medium pressure cylinder is communicated with the low pressure cylinder through a first pipeline; the intermediate pressure cylinder is connected with the high-temperature heat source heater through a second pipeline, the low pressure cylinder is communicated with the low-temperature heat source heater through a third pipeline, a water path of the heat supply network circulating water supply system sequentially passes through the high-temperature heat source heater and the low-temperature heat source heater, and water in the water path circularly flows from the low-temperature heat source heater to the high-temperature heat source heater.
The condensing and back-drawing integrated system is characterized in that a first valve is arranged on a water path of the heat supply network circulating water supply system, a heat supply network circulating pump is arranged on one side of the first valve, and water supply enters a user pipe network through the heat supply network circulating pump.
The application of the condensing and back-drawing integrated system comprises the following steps:
remanufacturing a 2 x 5-grade low-pressure rotor capable of adapting to wide back pressure operation, wherein a final-stage blade of the low-pressure rotor is replaced by a 712mm blade adopted by an air-cooled rotor from 1080mm, and the 2 x 5-grade low-pressure partition plate, the low-pressure steam inlet splitter ring, the low-pressure steam exhaust guide ring, the low-pressure partition plate steam seal, the low-pressure shaft end steam seal and the low-pressure cylinder water spray pipeline are all replaced;
reinforcing the tube bundle, the tube plate, the water chamber and the shell;
the small turbine and the large turbine of the feed pump share a condenser, so that the requirements of high-back-pressure heat supply in winter and low-back-pressure pure condensation operation in summer are met;
in the heating period, the exhaust back pressure of the small turbine is increased to 35kPa and is exhausted into a condenser, and the exhaust back pressure and the low-pressure cylinder exhaust of the large turbine are jointly used for heating the circulating water of the heat supply network for heat supply; in the non-heating period, the small steam turbine is recovered to be in pure condensing operation;
the low-pressure main valve, the high-pressure nozzle, the low-pressure nozzle, the steam distribution mechanism, the rotor, the partition plate group, the combined bearing and the servomotor are modified;
under the high back pressure operation mode, the temperature of the condensed water is in the range of 65-70 ℃, a water-water heat exchanger is additionally arranged in front of a fine treatment device in the condensed water system, the circulating water return of a heat supply network is used as a cooling medium, and the condensed water is cooled to about 50 ℃ and then enters the fine treatment device of the condensed water.
The invention provides a condensing and back-pumping integrated system based on a back pressure heat supply technology and application thereof, aiming at the changes of operating conditions such as high exhaust temperature and expansion amount of a low-pressure cylinder and high operating pressure of circulating cooling water of a condenser heat supply network in a high back pressure operating mode of a steam turbine, a condenser body is redesigned, the phenomenon that a low-pressure cylinder rotor is replaced twice after shutdown every year is avoided, a novel low-pressure cylinder rotor scheme which can adapt to a wider operating back pressure range with winter and summer is adopted, the operating back pressure of 30KPa is designed in a heating period, the high back pressure heating requirement in winter is met, the pure condensing and low back pressure operation economy is considered, and the frequency of replacing the corresponding rotor is greatly reduced after the system is operated.
Drawings
FIG. 1 is a schematic view of the back condensation and extraction integrated system of the present invention.
Detailed Description
The invention provides a condensation and back-extraction integrated system based on a back pressure heat supply technology and application thereof, and the invention is further described in detail below in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a condensing and back-drawing integrated system based on a back pressure heat supply technology, which comprises an intermediate pressure cylinder 1 and a low pressure cylinder 3, wherein the intermediate pressure cylinder 1 is communicated with the low pressure cylinder 3 through a first pipeline 2; the intermediate pressure cylinder 1 is connected with the high-temperature heat source heater 5 through the second pipeline 4, the low pressure cylinder 3 is communicated with the low-temperature heat source heater 7 through the third pipeline 6, a water channel 8 of the heat supply network circulating water supply system sequentially passes through the high-temperature heat source heater 5 and the low-temperature heat source heater 7, and water in the water channel 8 circularly flows from the low-temperature heat source heater 7 to the high-temperature heat source heater 5.
Furthermore, a first valve 9 is arranged on the water path 8 of the heat supply network circulating water supply system, a heat supply network circulating pump 10 is arranged on one side of the first valve 9, and water supply enters a user pipe network 11 through the heat supply network circulating pump 10.
The invention also provides an application of the back condensation and extraction integrated system, which comprises the following steps:
the original low-pressure outer cylinder and the original low-pressure inner cylinder are reserved, a 2 x 5-level low-pressure rotor which can adapt to the operation of wide back pressure is manufactured again, the last-stage blade of the low-pressure rotor is replaced by a 712mm blade adopted by an air cooling rotor from 1080mm, and the 2 x 5-level low-pressure partition plate, the low-pressure steam inlet flow distribution ring, the low-pressure steam exhaust flow guide ring, the low-pressure partition plate steam seal, the low-pressure shaft end steam seal and the low-pressure cylinder water spraying pipeline are all replaced so as to meet the requirements of installation and operation.
Aiming at the changes of the operating conditions such as the increase of the exhaust temperature and the increase of the expansion amount of the low-pressure cylinder, the higher operating pressure of the circulating cooling water of the heat supply network of the condenser and the like in the high back pressure operating mode of the steam turbine, the condenser body is redesigned, and the tube bundle, the tube plate, the water chamber and the shell are reinforced.
The small turbine and the large turbine of the feed pump share a condenser, so that the requirements of high-back-pressure heat supply in winter and low-back-pressure pure condensation operation in summer are met;
the small steam turbine of the water feeding pump and the large machine share the condenser, the small steam turbine of the water feeding pump is modified to meet the requirements of high back pressure heat supply in winter and low back pressure pure condensation operation in summer, during a heating period, the exhaust back pressure of the small steam turbine is increased to 35kPa and is exhausted into the condenser, and the exhaust back pressure of the small steam turbine and the exhaust steam of a low pressure cylinder of the large machine are used for heating circulating water of a heat supply network for heat supply; in the non-heating period, the small steam turbine is recovered to be in pure condensing operation;
meanwhile, the partition plate and the rotor of the small steam turbine are redesigned, and a low-pressure main valve, a high-pressure nozzle, a low-pressure nozzle, a steam distribution mechanism, the rotor, the partition plate group, a combined bearing and an oil engine are modified;
under the high back pressure operation mode, the temperature of the condensed water is in the range of 65-70 ℃, a water-water heat exchanger is additionally arranged in front of a fine treatment device in the condensed water system, the circulating water return of a heat supply network is used as a cooling medium, and the condensed water is cooled to about 50 ℃ and then enters the fine treatment device of the condensed water.
Because the condensate fine treatment device has limitation on the temperature of the entering condensate, the highest temperature resistance temperature of the ion exchange resin in the mixed bed is 60 ℃, and the temperature of the condensate is about 70 ℃ in the high back pressure operation mode, in order to ensure the normal operation of the fine treatment device, the invention adds a water-water heat exchanger in front of the fine treatment device in the condensate system, takes the circulating water return of a heat supply network as a cooling medium, cools the condensate to about 50 ℃ and then enters the condensate fine treatment device, thereby ensuring the safe operation of the fine treatment device.
It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A condensing and back-drawing integrated system based on a backpressure heat supply technology comprises a medium pressure cylinder and a low pressure cylinder, and is characterized in that the medium pressure cylinder is communicated with the low pressure cylinder through a first pipeline; the intermediate pressure cylinder is connected with the high-temperature heat source heater through a second pipeline, the low pressure cylinder is communicated with the low-temperature heat source heater through a third pipeline, a water path of the heat supply network circulating water supply system sequentially passes through the high-temperature heat source heater and the low-temperature heat source heater, and water in the water path circularly flows from the low-temperature heat source heater to the high-temperature heat source heater.
2. The system of claim 1, wherein a first valve is disposed in the water path of the heat supply network circulating water supply system, and a heat supply network circulating pump is disposed on one side of the first valve, so that water can enter the user network through the heat supply network circulating pump.
3. Use of the condensation and back extraction integrated system according to claim 1, comprising the steps of:
remanufacturing a 2 x 5-grade low-pressure rotor capable of adapting to wide back pressure operation, wherein a final-stage blade of the low-pressure rotor is replaced by a 712mm blade adopted by an air-cooled rotor from 1080mm, and the 2 x 5-grade low-pressure partition plate, the low-pressure steam inlet splitter ring, the low-pressure steam exhaust guide ring, the low-pressure partition plate steam seal, the low-pressure shaft end steam seal and the low-pressure cylinder water spray pipeline are all replaced;
reinforcing the tube bundle, the tube plate, the water chamber and the shell;
the small turbine and the large turbine of the feed pump share a condenser, so that the requirements of high-back-pressure heat supply in winter and low-back-pressure pure condensation operation in summer are met;
in the heating period, the exhaust back pressure of the small turbine is increased to 35kPa and is exhausted into a condenser, and the exhaust back pressure and the low-pressure cylinder exhaust of the large turbine are jointly used for heating the circulating water of the heat supply network for heat supply; in the non-heating period, the small steam turbine is recovered to be in pure condensing operation;
the low-pressure main valve, the high-pressure nozzle, the low-pressure nozzle, the steam distribution mechanism, the rotor, the partition plate group, the combined bearing and the servomotor are modified;
under the high back pressure operation mode, the temperature of the condensed water is in the range of 65-70 ℃, a water-water heat exchanger is additionally arranged in front of a fine treatment device in the condensed water system, the circulating water return of a heat supply network is used as a cooling medium, and the condensed water is cooled to about 50 ℃ and then enters the fine treatment device of the condensed water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911178065.4A CN110821585A (en) | 2019-11-27 | 2019-11-27 | Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911178065.4A CN110821585A (en) | 2019-11-27 | 2019-11-27 | Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof |
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| Publication Number | Publication Date |
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| CN110821585A true CN110821585A (en) | 2020-02-21 |
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| CN201911178065.4A Withdrawn CN110821585A (en) | 2019-11-27 | 2019-11-27 | Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682115A (en) * | 2020-12-18 | 2021-04-20 | 山东齐鲁电机制造有限公司 | High back pressure transformation method based on extraction condensing turbine |
| CN114508773A (en) * | 2021-12-29 | 2022-05-17 | 东方电气集团东方汽轮机有限公司 | Flexible high-back-pressure heat supply system and heat supply method thereof |
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| CN106949521A (en) * | 2017-04-01 | 2017-07-14 | 祝凤娟 | A kind of heat supply remodeling method for realizing the operation of turbine condenser high vacuum |
| CN206801627U (en) * | 2017-03-28 | 2017-12-26 | 华电电力科学研究院 | A kind of steam turbine extraction condensing back pressure system |
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2019
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| CN204460401U (en) * | 2014-12-12 | 2015-07-08 | 华电电力科学研究院 | Full ecad single rotor low vacuum circulating water heating system |
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| CN206801627U (en) * | 2017-03-28 | 2017-12-26 | 华电电力科学研究院 | A kind of steam turbine extraction condensing back pressure system |
| CN106949521A (en) * | 2017-04-01 | 2017-07-14 | 祝凤娟 | A kind of heat supply remodeling method for realizing the operation of turbine condenser high vacuum |
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Non-Patent Citations (1)
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| 张虎男: "350MW超临界机组高背压供热改造研究及性能分析", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112682115A (en) * | 2020-12-18 | 2021-04-20 | 山东齐鲁电机制造有限公司 | High back pressure transformation method based on extraction condensing turbine |
| CN112682115B (en) * | 2020-12-18 | 2023-02-24 | 山东齐鲁电机制造有限公司 | High back pressure transformation method based on extraction condensing turbine |
| CN114508773A (en) * | 2021-12-29 | 2022-05-17 | 东方电气集团东方汽轮机有限公司 | Flexible high-back-pressure heat supply system and heat supply method thereof |
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Application publication date: 20200221 |