CN114183807B - Steam extraction and heat supply regulation and control method for secondary heating steam turbine generator unit - Google Patents
Steam extraction and heat supply regulation and control method for secondary heating steam turbine generator unit Download PDFInfo
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- CN114183807B CN114183807B CN202111415912.1A CN202111415912A CN114183807B CN 114183807 B CN114183807 B CN 114183807B CN 202111415912 A CN202111415912 A CN 202111415912A CN 114183807 B CN114183807 B CN 114183807B
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- 238000000605 extraction Methods 0.000 title claims abstract description 206
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- 230000001105 regulatory effect Effects 0.000 claims description 72
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- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000010248 power generation Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000005514 two-phase flow Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
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- 238000005507 spraying Methods 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 230000005494 condensation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
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- 239000008236 heating water Substances 0.000 description 1
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- 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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- 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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
- F22B37/46—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
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- 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
- F24D1/00—Steam central heating systems
- F24D1/02—Steam central heating systems operating with live steam
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention belongs to the technical field of heat supply and power generation and control and analysis thereof, and particularly relates to a steam extraction and heat supply regulation and control method for a steam turbine generator unit with secondary heating. The heat supply steam flow demand is met by controlling the steam extraction flow of the secondary heating cold section steam extraction pipe and the secondary heating hot section steam extraction pipe, the steam flow proportion is adjusted in real time, the temperature is changed correspondingly after the different steam extraction flow proportions of the secondary heating cold section steam extraction pipe and the secondary heating hot section steam extraction pipe are mixed, and the heat supply steam with different temperature grades can be met; and the temperature of the heating steam is adjusted by combining the vapor-liquid two-phase heat exchanger, so that the temperature range of the heating steam is expanded. Meanwhile, the steam can be supplied to the outside without being connected to the grid of the unit, and the thermoelectric decoupling can be realized.
Description
Technical Field
The invention belongs to the technical field of heat supply and power generation and control and analysis thereof, and particularly relates to a steam extraction and heat supply regulation and control method for a steam turbine generator unit with secondary heating.
Background
In order to respond to the requirements of national energy-saving and environment-friendly policies, industrial small boilers are gradually eliminated, peripheral condensing type generator sets are replaced by the industrial small boilers to supply heat and transform, and central heat supply for heat-consuming enterprises is realized by extracting steam from a steam system of the generator sets. The steam turbine generator unit adopting the secondary heating is a preferred mode for industrial steam supply because the pressure of the steam inlet and outlet (namely, the steam outlet of the high-pressure cylinder and the steam inlet of the intermediate pressure cylinder of the steam turbine) of the secondary heating of the boiler is high, and the steam is easy to extract from the opening of the corresponding steam pipeline and is suitable for long-distance transportation. However, the secondary heating steam inlet temperature of the boiler is low, the steam outlet temperature is high, the requirement cannot be met when the secondary heating steam inlet steam extraction temperature of the boiler is low independently, and the steam extraction amount is increased, so that the secondary heating steam outlet temperature is over-high, and the risk of damage to a heat exchange tube is caused; the temperature of the steam extracted by secondary heating of the boiler is too high independently, and the steam is required to be cooled by spraying the temperature-reducing water, and the energy consumption of the temperature-reducing water cooling mode is higher, and the phenomena of steam impact, uneven water spraying and the like exist, so that the service life of equipment is reduced.
Disclosure of Invention
In order to solve the problem that the steam extraction and supply temperature on the steam inlet and outlet pipelines for secondary heating of the boiler is too high or too low, the invention provides a steam extraction and heat supply regulation and control method for a steam turbine generator unit with secondary heating, which has the following specific technical scheme:
a steam extraction and heat supply regulation and control method for a secondary heating steam turbine generator unit is characterized in that a boiler of the steam turbine generator unit is connected with an intermediate pressure cylinder through a secondary heating main steam pipe; the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are connected in sequence; the low pressure cylinder is connected with the condenser; the high-pressure cylinder is connected with the boiler through a secondary heating cold section steam pipe; the boiler is connected with the intermediate pressure cylinder through a secondary heating main steam pipe; the boiler is connected with the high-pressure cylinder through a main steam pipe; the method comprises the following steps:
s1: connecting the vapor-liquid two-phase heat exchanger, and communicating the vapor inlet end of the vapor side of the vapor-liquid two-phase heat exchanger with a vapor extraction direct vapor supply pipe through a vapor extraction manifold; one path of a steam outlet end at the steam side of the steam-liquid two-phase heat exchanger is connected with a heat supply steam header through a steam supply main pipe and a heat supply steam pipe, and the other path of the steam outlet end is connected with No. 2 Gao Jia through the steam supply main pipe and a No. 2 Gao Jia heating steam supply pipe; connecting the water inlet end of the water side of the vapor-liquid two-phase heat exchanger with a No. 1 Gao Jia through a vapor-liquid two-phase heat exchanger water supply inlet pipe and a vapor-liquid two-phase heat exchanger water supply pipe; connecting the water outlet end of the water side of the vapor-liquid two-phase heat exchanger with a boiler through a water supply outlet pipe of the vapor-liquid two-phase heat exchanger and a water supply pipe of the boiler; a water supply outlet stop valve of the vapor-liquid two-phase heat exchanger is arranged on a water supply outlet pipe of the vapor-liquid two-phase heat exchanger;
communicating the steam extraction collecting pipe with a No. 2 Gao Jia heating steam supply pipe through a No. 2 Gao Jia steam extraction pipe;
a water supply bypass valve of the vapor-liquid two-phase heat exchanger and a pipeline thereof are arranged between a water supply pipe of the vapor-liquid two-phase heat exchanger and a water supply pipe of the boiler;
a secondary heating main steam pipe is communicated with a heat supply steam header through a secondary heating hot section steam extraction pipe, a steam extraction direct steam supply pipe and a heat supply steam pipe in sequence;
communicating a secondary heating cold section steam pipe with a steam extraction direct steam supply pipe through a secondary heating cold section steam extraction pipe;
the deaerator is connected with a No. 3 high pressure water pump through a water supply pump outlet water supply pipe;
connecting No. 1 Gao Jia, no. 2 Gao Jia and No. 3 Gao Jia in sequence through pipelines;
s2: setting heat supply steam pressure Pg and heat supply steam temperature Tg of a steam turbine generator unit, igniting the boiler, heating and boosting the boiler one by one after the boiler is ignited, and opening corresponding valves to transmit the steam in the secondary heating main steam pipe to a heat supply steam header for external steam supply through a secondary heating hot section steam extraction pipe, a steam extraction direct steam supply pipe and a heat supply steam pipe when the steam temperature and the pressure in the secondary heating main steam pipe reach the heat supply steam pressure Pg and the heat supply steam temperature Tg of the steam turbine generator unit;
s3: after the boiler is ignited, the temperature and the pressure are increased gradually, when the temperature of steam in the secondary heating main steam pipe is higher than the temperature Tg of heat supply steam, a corresponding valve is opened to lead low-temperature steam in the secondary heating cold section steam pipe into a steam extraction direct steam supply pipe through the secondary heating cold section steam extraction pipe, and the low-temperature steam is mixed with high-temperature steam extracted from the secondary heating main steam pipe through the secondary heating hot section steam extraction pipe, so that the temperature of the steam at the heat supply steam header is the temperature Tg of the heat supply steam;
s4: continuing heating and boosting the boiler, when the steam at the heating steam header cannot be reduced to the heating steam temperature Tg by adjusting a secondary heating cold section steam extraction pipe and a secondary heating hot section steam extraction pipe, putting a steam-liquid two-phase heat exchanger into operation, inputting high-temperature steam in a steam extraction collecting pipe into the steam-liquid two-phase heat exchanger, carrying out steam-liquid heat exchange with water extracted from No. 1 Gao Jia, cooling the high-temperature steam, and mixing the cooled steam with the high-temperature steam in a steam extraction direct steam supply pipe through a steam supply main pipe in the heating steam pipe to ensure that the temperature of the mixed steam is stabilized at the heating steam temperature Tg;
s5: the water temperature after the heat exchange of the vapor-liquid two-phase heat exchanger is increased and then flows into the boiler through a water feeding pipe of the boiler.
Preferably, before the boiler is ignited in step S2, the method further includes determining whether the boiler reaches an ignition condition, specifically: all valves are closed when the boiler is not ignited; and (3) opening a water supply outlet stop valve of the vapor-liquid two-phase heat exchanger, starting a water supply pump to enable condensed water in the deaerator to flow through a No. 3 high heater, a No. 2 high heater, a No. 1 Gao Jia and a water supply inlet pipe of the vapor-liquid two-phase heat exchanger to enter a water inlet end of the vapor-liquid two-phase heat exchanger, and enter a boiler from a water outlet end of the water side of the vapor-liquid two-phase heat exchanger through a water supply outlet pipe of the vapor-liquid two-phase heat exchanger and a water supply pipe of the boiler, and igniting after the water level of the boiler reaches a preset value.
Preferably, the step S2 further includes: the high-pressure bypass valve of the steam turbine and the temperature reduction device thereof are automatically controlled, and the aim of the automatic control is to keep the steam pressure in the main steam pipe at the boiler-starting pressure value P of the boiler q (ii) a When the steam pressure in the main steam pipe is lower than the boiler-starting pressure value P of the boiler q When the steam pressure in the main steam pipe is higher than the boiler-starting pressure value P of the boiler, the high-pressure bypass valve of the steam turbine and the temperature reducing device thereof are closed q When the temperature of the turbine is reduced, the turbine high-pressure bypass valve and the temperature reducing device thereof are opened.
Preferably, the step S2 further includes: the method also comprises the step of setting a low-pressure bypass valve of the steam turbine and the automatic control of a temperature reduction device thereof, wherein the automatic control aims at keeping the steam pressure in the secondary heating main steam pipe at P s1 ±0.05，P s1 Determining according to the heating steam parameter pressure Pg, and taking P s1 ＝Pg；
When the steam pressure in the secondary heating main steam pipe reaches P s1 When +/-0.05, fully opening a No. 2 Gao Jia steam extraction stop valve, opening a No. 2 Gao Jia steam extraction regulating valve to enable steam in a low-pressure bypass of the steam turbine to enter No. 2 Gao Jia through a secondary heating hot section steam extraction pipe, a steam extraction collecting pipe and a No. 2 Gao Jia steam extraction steam pipe, and heating feed water flowing through No. 2 Gao Jia to realize heat energy recycling; and reducing the passage of the low-pressure bypass valve of the steam turbine and the temperature reduction thereofThe amount of the superheated steam flowing into the condenser is reduced, so that the energy loss is reduced, and the heat load of the condenser is reduced.
Preferably, the step S3 further includes: the low-pressure bypass valve of the steam turbine and the temperature reduction device thereof are automatically controlled, and the aim of the automatic control is to keep the steam pressure in the secondary heating main steam pipe at P s2 ±0.05，P s2 And the starting pressure parameter of the pressure cylinder in the unit is determined.
Preferably, the step S3 further includes: when the pressure and the temperature of the steam in the secondary heating main steam pipe respectively reach the starting pressure and the starting temperature of the steam turbine generator unit, the corresponding valve is opened to enable the steam in the secondary heating main steam pipe to enter the intermediate pressure cylinder to flush the steam turbine, and grid-connected power generation is carried out after the rated rotating speed is reached.
Preferably, the step S1 further comprises: connecting the bottom of the vapor-liquid two-phase heat exchanger with a deaerator through a vapor-liquid two-phase heat exchanger drain pipe, and arranging a vapor-liquid two-phase heat exchanger liquid level measuring device at the bottom of the vapor-liquid two-phase heat exchanger;
after the vapor-liquid two-phase heat exchanger is put into operation, when the liquid level measuring device of the vapor-liquid two-phase heat exchanger sends a liquid level alarm signal, the condensed water in the vapor-liquid two-phase heat exchanger is discharged to the deaerator for recycling through the drain pipe of the vapor-liquid two-phase heat exchanger.
Preferably, the vapor-liquid two-phase heat exchanger comprises a water inlet and outlet area and a heat exchange area, wherein the water inlet and outlet area is arranged above the heat exchange area; a U-shaped heat exchange tube of the vapor-liquid two-phase heat exchanger is arranged in the vapor-liquid two-phase heat exchanger; the water inlet and the water outlet of the U-shaped heat exchange tube of the vapor-liquid two-phase heat exchanger are respectively arranged in a water inlet and outlet area at the upper part of the vapor-liquid two-phase heat exchanger, wherein the water inlet of the U-shaped heat exchange tube of the vapor-liquid two-phase heat exchanger is communicated with a water supply inlet tube of the vapor-liquid two-phase heat exchanger, and the water outlet of the U-shaped heat exchange tube of the vapor-liquid two-phase heat exchanger is communicated with a water supply outlet tube of the vapor-liquid two-phase heat exchanger; the bottom of the U-shaped heat exchange tube of the vapor-liquid two-phase heat exchanger extends to the bottom of the heat exchange area; the steam inlet end of the steam side of the steam-liquid two-phase heat exchanger is arranged at the upper part of the heat exchange area and is close to the bottom of the water inlet and outlet area; and the steam outlet end of the steam side of the steam-liquid two-phase heat exchanger is arranged at the bottom of the heat exchange area.
Preferably, stepped vapor-liquid two-phase heat exchanger vapor guide plates are respectively fixed on the inner walls of the two sides of the heat exchange area of the vapor-liquid two-phase heat exchanger, so that the steam entering the vapor-liquid two-phase heat exchanger flows in an S-shaped route from top to bottom.
The beneficial effects of the invention are as follows: the invention provides a steam extraction and heat supply regulation method for a secondary heating steam turbine generator unit, which meets the requirement of heat supply steam flow by controlling the steam extraction flow of a secondary heating cold-section steam extraction pipe and a secondary heating hot-section steam extraction pipe, and regulates the steam flow proportion in real time; and the temperature of the heating steam is adjusted by combining the vapor-liquid two-phase heat exchanger, so that the temperature range of the heating steam is expanded. Meanwhile, the steam can be supplied to the outside without grid connection of the unit, and the thermoelectric decoupling is realized.
After the vapor-liquid two-phase heat exchanger is put into operation, the No. 2 Gao Jia vapor extraction regulating valve is used as an auxiliary regulating means, and the No. 2 Gao Jia vapor extraction regulating valve is opened to split the amount of vapor flowing from the vapor extraction flow splitting pipe to the vapor inlet regulating valve of the vapor-liquid two-phase heat exchanger, so that the adjustment of the vapor inlet flow of the vapor-liquid two-phase heat exchanger can be participated in according to needs, the control of the vapor temperature of the vapor supply main pipe is realized, and the vapor temperature of the vapor supply main pipe is measured by the vapor temperature measuring device of the vapor supply main pipe; the device is also used as a guarantee means for heating a steam source by No. 2 Gao Jia when the steam-liquid two-phase heat exchanger is out of operation.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of the system architecture of the connection of the present invention;
fig. 3 is a schematic diagram of the valve control of the present invention.
Wherein, a vapor-liquid two-phase heat exchanger 1, a vapor-liquid two-phase heat exchanger water inlet and outlet separation plate 2, a vapor-liquid two-phase heat exchanger steam guide plate 3, a vapor-liquid two-phase heat exchanger U-shaped heat exchange tube 4, a vapor supply main pipe 5, a vapor temperature measuring device 6 of the vapor supply main pipe, a vapor pressure measuring device 7 of the vapor supply main pipe, a heat supply vapor pipe stop valve 8, a heat supply vapor regulating valve 9, a heat supply vapor header 10, a data acquisition and control device 11, a vapor-liquid two-phase heat exchanger water supply outlet pipe 12, a vapor-liquid two-phase heat exchanger water supply outlet stop valve 13, a vapor-liquid two-phase heat exchanger steam inlet regulating valve 14, a vapor extraction header 15, a vapor-liquid two-phase heat exchanger water supply inlet pipe 16, a vapor-liquid two-phase heat exchanger water supply inlet regulating valve 17, a vapor-liquid two-phase heat exchanger water supply bypass pipe 18, a vapor-liquid two-phase heat exchanger water supply bypass regulating valve 19, a boiler water supply pipe 20, a boiler 21, a secondary heating main vapor pipe 22 a secondary heating main steam pipe steam pressure measuring device 23, a secondary heating main steam pipe steam temperature measuring device 24, a main steam pipe 25, a steam turbine high-pressure bypass valve and a temperature reducing device thereof 26, a steam turbine high-pressure bypass pipe 27, a secondary heating cold section steam temperature measuring device 28, a secondary heating cold section steam pressure measuring device 29, a secondary heating cold section steam pipe 30, a secondary heating cold section steam extraction pipe 31, a secondary heating cold section steam extraction check valve 32, a secondary heating cold section steam extraction stop valve 33, a secondary heating cold section steam extraction regulating valve 34, a secondary heating hot section steam extraction pipe 35, a steam extraction direct steam supply pipe temperature measuring device 36, a steam extraction direct steam supply pipe pressure measuring device 37, a first-gear steam extraction stop valve 38, a first-gear steam extraction regulating valve 39, a first-gear steam extraction pipe 40, a secondary heating hot section steam extraction pressure measuring device 41, a secondary heating hot section steam extraction temperature measuring device 42, A first-gear steam extraction check valve 43, a second-gear heating hot-section steam extraction regulating valve 44, a second-gear heating hot-section steam extraction stop valve 45, a second-gear heating hot-section steam extraction check valve 46, a first high-pressure cylinder steam extraction check valve 47, a second high-pressure cylinder steam extraction check valve 48, a high-pressure cylinder regulating valve 49, a high-pressure cylinder 50, a medium-pressure cylinder regulating valve 51, a medium-pressure cylinder 52, a third-gear steam extraction pipe 53, a third-gear steam extraction check valve 54, a third-gear steam extraction stop valve 55, a third-gear steam extraction regulating valve 56, a medium-low communication pipe 57, a low-pressure cylinder 58, a generator 59, a steam-liquid two-phase heat exchanger drain pipe 60, a No. 3 Gao Jia drain pipe 61, an oxygen remover 62, a water feeding pump 63, a water feeding pump outlet check valve 64, a water feeding pump outlet water feeding pipe 65, a No. 3 Gao Jia, a No. 3 high-to-No. 2 high-adding water feeding pipe 67, gao Jia 68, 2 # high plus to 1 # Gao Jia water inlet pipe 69, 1 # Gao Jia, 2 # high plus to 3 # Gao Jia steam trap 71, 1 # high plus to 2 # Gao Jia steam trap 72, 2 # Gao Jia heating steam supply pipe 73, 2 # Gao Jia steam extraction regulating valve 74,2 # Gao Jia steam extraction stop valve 75, 2 # Gao Jia steam extraction steam pipe 76, steam-liquid two-phase heat exchanger steam trap regulating valve 77, steam-liquid two-phase heat exchanger steam trap stop valve 78, steam-liquid two-phase heat exchanger liquid level measuring device 79, 2 # Gao Jia heating steam supply regulating valve 80, 2 # Gao Jia heating steam supply stop valve 81, steam supply mother pipe 82, heat supply steam pipe 83, steam pressure measuring device 84, heat supply steam temperature measuring device 85, steam extraction regulating valve 3963, steam extraction regulating valve 80, 2 # 4325 zxft Steam extraction bypass pipe 89, steam turbine low pressure steam bypass device 89, steam turbine low pressure steam bypass steam temperature measuring device 89, steam turbine low pressure steam turbine bypass device 91, steam turbine low pressure steam bypass device and steam temperature steam turbine bypass device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, an embodiment of the present invention provides a method for regulating and controlling steam extraction and heat supply of a steam turbine generator unit with secondary heating, and as shown in fig. 2, a boiler 21 of the steam turbine generator unit is connected to an intermediate pressure cylinder 52 through a main secondary heating steam pipe 22; the high pressure cylinder 50, the intermediate pressure cylinder 52 and the low pressure cylinder 58 are connected in sequence; the low pressure cylinder 58 is connected with a condenser 92; the high pressure cylinder 50 is connected with the boiler 21 through a secondary heating cold section steam pipe 30; the boiler 21 is connected with the intermediate pressure cylinder 52 through the secondary heating main steam pipe 22; the boiler 21 is connected with a high pressure cylinder 50 through a main steam pipe 25; the method comprises the following steps:
s1: the steam-liquid two-phase heat exchanger 1 is connected, and the steam inlet end at the steam side of the steam-liquid two-phase heat exchanger 1 is communicated with a steam extraction direct steam supply pipe 87 through a steam extraction collecting pipe 15; one path of the steam outlet end at the steam side of the steam-liquid two-phase heat exchanger 1 is connected with a heat supply steam header 10 through a steam supply main pipe 5 and a heat supply steam pipe 83, and the other path is connected with a No. 2 Gao Jia through the steam supply main pipe 5 and a No. 2 Gao Jia heating steam supply pipe 73; connecting the water inlet end of the water side of the vapor-liquid two-phase heat exchanger 1 with a No. 1 Gao Jia through a vapor-liquid two-phase heat exchanger water supply inlet pipe 16 and a vapor-liquid two-phase heat exchanger water supply pipe 18; the water outlet end of the water side of the vapor-liquid two-phase heat exchanger 1 is connected with a boiler 21 through a water supply outlet pipe 12 of the vapor-liquid two-phase heat exchanger and a water supply pipe 20 of the boiler; a water supply outlet stop valve 13 of the vapor-liquid two-phase heat exchanger is arranged on the water supply outlet pipe 12 of the vapor-liquid two-phase heat exchanger;
communicating the steam extraction manifold 15 with a No. 2 Gao Jia heating steam supply pipe 73 through a No. 2 Gao Jia steam extraction steam pipe 76;
a water supply bypass valve 19 of the vapor-liquid two-phase heat exchanger and a pipeline thereof are arranged between a water supply pipe 18 of the vapor-liquid two-phase heat exchanger and a water supply pipe 20 of a boiler;
the secondary heating main steam pipe 22 is communicated with the heat supply steam header 10 through a secondary heating hot section steam extraction pipe 35, a steam extraction direct steam supply pipe 87 and a heat supply steam pipe 83 in sequence;
communicating the secondary heating cold section steam pipe 30 with a steam extraction direct steam supply pipe 87 through a secondary heating cold section steam extraction pipe 31;
the deaerator 62 is connected with No. 3 Gao Jia through a water supply pump outlet water supply pipe 65;
gao Jia 70, gao Jia, and Gao Jia, no. 1, no. 2, and No. 3, respectively, are connected in sequence by a pipe.
The first check valve 47 of the high-pressure cylinder steam exhaust and the second check valve 48 of the high-pressure cylinder steam exhaust are respectively arranged at the joint of the high-pressure cylinder 50 and the secondary heating cold section steam pipe 30. And a steam supply main pipe stop valve 82 is arranged on the steam supply main pipe 5. A feed water outlet stop valve 13 of the vapor-liquid two-phase heat exchanger is arranged on the feed water outlet pipe 12 of the vapor-liquid two-phase heat exchanger.
The secondary heating hot section steam extraction pipe 35 is provided with a secondary heating hot section steam extraction regulating valve 44 which is connected with the data acquisition and control device 11 through a signal line; a secondary heating hot section steam extraction stop valve 45 and a secondary heating hot section steam extraction check valve 46 are arranged in front of the secondary heating hot section steam extraction regulating valve 44.
The secondary heating cold section steam extraction pipe 31 is provided with a secondary heating cold section steam extraction regulating valve 34 which is connected with the data acquisition and control device 11 through a signal line; a secondary heating cold section steam extraction check valve 32 and a secondary heating cold section steam extraction stop valve 33 are arranged in front of the secondary heating cold section steam extraction regulating valve 34.
The steam extraction direct steam supply pipe 87 is provided with a steam extraction direct steam supply regulating valve 86 which is connected with the data acquisition and control device 11 through a signal line;
the heating steam pipe 83 is provided with a heating steam regulating valve 9 which is connected with the data acquisition and control device 11 through a signal line; the heat supply steam regulating valve 9 is also provided with a heat supply steam pipe stop valve 8.
A water supply inlet regulating valve 17 of the vapor-liquid two-phase heat exchanger connected with the data acquisition and control device 11 is arranged on the water supply inlet pipe 16 of the vapor-liquid two-phase heat exchanger;
the steam extraction collecting pipe 15 is provided with a steam inlet regulating valve 14 of the steam-liquid two-phase heat exchanger which is connected with the data acquisition and control device 11 through a signal line;
the No. 2 Gao Jia heating steam supply pipe 73 is provided with a No. 2 Gao Jia heating steam supply regulating valve 80 which is connected with the data acquisition and control device 11 through a signal line; a No. 2 Gao Jia heating steam supply stop valve 81 is also arranged before the No. 2 Gao Jia heating steam supply regulating valve 80. The secondary heating hot section steam extraction pipe 35 is provided with a secondary heating hot section steam extraction pressure measuring device 41 and a secondary heating hot section steam extraction temperature measuring device 42 which are respectively connected with the data acquisition and control device 11 and are respectively used for measuring the pressure and the temperature of steam extraction in the secondary heating hot section steam extraction pipe 35;
the steam extraction direct steam supply pipe temperature measuring device 36 and the steam extraction direct steam supply pipe pressure measuring device 37 which are respectively connected with the data acquisition and control device 11 are arranged on the steam extraction direct steam supply pipe 87 and in front of the connection part of the steam extraction manifold 15;
the heat supply steam pipe 83 is provided with a heat supply steam pressure measuring device 84 and a heat supply steam temperature measuring device 85 which are respectively connected with the data acquisition and control device 11 through signal lines and are respectively used for measuring the pressure and the temperature of heat supply steam in the heat supply steam pipe 83; the steam supply main pipe 5 is provided with a steam temperature measuring device 6 of the steam supply main pipe and a steam pressure measuring device 7 of the steam supply main pipe which are respectively connected with the data acquisition and control device 11 through signal lines and are respectively used for measuring the temperature and the pressure of the steam in the steam supply main pipe 5; the data acquisition and control device 11 controls the opening of the secondary heating hot section steam extraction regulating valve 44, the secondary heating cold section steam extraction regulating valve 34, the steam extraction direct steam supply regulating valve 86, the heat supply steam regulating valve 9, the steam-liquid two-phase heat exchanger steam inlet regulating valve 14, the steam-liquid two-phase heat exchanger water supply inlet regulating valve 17 and the No. 2 Gao Jia heating steam supply regulating valve 80 according to the measurement data of the secondary heating hot section steam extraction pressure measuring device 41, the secondary heating hot section steam extraction temperature measuring device 42, the steam extraction direct steam supply pipe temperature measuring device 36, the steam extraction direct steam supply pipe pressure measuring device 37, the heat supply steam pressure measuring device 84, the heat supply steam temperature measuring device 85, the steam supply main pipe steam temperature measuring device 6 and the steam supply main pipe steam pressure measuring device 7;
the steam-liquid two-phase heat exchanger 1 extracts steam from the main secondary heating steam pipe 22 and/or the secondary heating cold section steam extraction pipe 31 to secondarily heat the water supply transmitted from the No. 1 Gao Jia through the water supply inlet pipe 16 of the steam-liquid two-phase heat exchanger and adjust the temperature of the steam supply in the heat supply steam pipe 83.
The main steam pipe 25 is communicated with a secondary heating cold section steam pipe 30 through a turbine high pressure bypass pipe 27. The turbine high pressure bypass pipe 27 is provided with a turbine high pressure bypass valve and a temperature reducing device 26 thereof which are connected with the data acquisition and control device 11. A secondary heating main steam pipe steam pressure measuring device 23 and a secondary heating main steam pipe steam temperature measuring device 24 which are respectively connected with the data acquisition and control device 11 are arranged on the secondary heating main steam pipe 22 and before the secondary heating hot section steam extraction pipe 35 is connected with the secondary heating main steam pipe 22, and are respectively used for measuring the pressure and the temperature of the steam which flows into the secondary heating main steam pipe 22 from the boiler 21 in the secondary heating mode. A main steam pipe steam pressure measuring device 88 and a main steam pipe steam temperature measuring device 89 which are respectively connected with the data acquisition and control device 11 are arranged on the main steam pipe 25 before the turbine high-pressure bypass pipe 27 is connected with the main steam pipe 25, and are respectively used for measuring the pressure and the temperature of the steam which flows out of the boiler 21 and flows into the main steam pipe 25. A high-pressure cylinder regulating valve 49 connected to the data collecting and controlling device 11 is provided on the main steam pipe 25 after the turbine high-pressure bypass pipe 27 is connected to the main steam pipe 25, and regulates the amount of steam entering the high-pressure cylinder 50 from the main steam pipe 25.
A secondary heating cold section steam temperature measuring device 28 and a secondary heating cold section steam pressure measuring device 29 which are respectively connected with the data acquisition and control device 11 are arranged on the secondary heating cold section steam pipe 30 and before the secondary heating cold section steam extraction pipe 31 is connected with the secondary heating cold section steam pipe 30, and are used for measuring the temperature and the pressure of secondary heating steam which comes out of the high-pressure cylinder 50.
The high-pressure cylinder 50 is connected with No. 1 Gao Jia through a first-gear steam extraction pipe 40, and a first-gear steam extraction check valve 43, a first-gear steam extraction stop valve 38 and a first-gear steam extraction regulating valve 39 are sequentially arranged on the first-gear steam extraction pipe 40 connected with No. 1 Gao Jia of the high-pressure cylinder 50.
The intermediate pressure cylinder 52 is connected with the secondary heating main steam pipe 22 through an intermediate pressure cylinder adjusting valve 51 and a pipeline thereof, the intermediate pressure cylinder 52 is connected with the low pressure cylinder 58 through an intermediate pressure cylinder communicating pipe 57, the condenser 92 is communicated with the secondary heating main steam pipe 22 through a turbine low pressure bypass 90, and a turbine low pressure bypass valve and a temperature reduction device 91 thereof are arranged on the turbine low pressure bypass 90.
The intermediate pressure cylinder 52 is connected with No. 3 Gao Jia through a third-gear steam extraction pipe 53, and the third-gear steam extraction check valve 54, the third-gear steam extraction stop valve 55 and the third-gear steam extraction regulating valve 56 are sequentially arranged on the third-gear steam extraction pipe 53 connected with No. 3 Gao Jia of the intermediate pressure cylinder 52.
The bottom of the heat exchange area of the vapor-liquid two-phase heat exchanger 1 is provided with a vapor-liquid two-phase heat exchanger liquid level measuring device 79 connected with the data acquisition and control device 11 and used for monitoring the liquid level of condensed water at the bottom of the vapor-liquid two-phase heat exchanger 1.
The bottom of the heat exchange area of the vapor-liquid two-phase heat exchanger 1 is communicated with the deaerator 62 through a vapor-liquid two-phase heat exchanger drain pipe 60, a vapor-liquid two-phase heat exchanger drain pipe regulating valve 77 connected with the data acquisition and control device 11 is arranged on the vapor-liquid two-phase heat exchanger drain pipe 60 and used for being opened under the control of the data acquisition and control device 11 when the liquid level of condensed water at the bottom of the vapor-liquid two-phase heat exchanger 1 reaches an alarm liquid level and being closed under the control of the data acquisition and control device 11 when the liquid level of the condensed water at the bottom of the vapor-liquid two-phase heat exchanger 1 falls to a safe liquid level. A vapor-liquid two-phase heat exchanger drain pipe stop valve 78 is also provided before the vapor-liquid two-phase heat exchanger drain pipe regulating valve 77.
The steam extraction collecting pipe 15 is communicated with No. 2 Gao Jia through a No. 2 Gao Jia steam extraction pipe 76, and the No. 2 Gao Jia steam extraction pipe 76 is used for sequentially extracting steam from the steam extraction collecting pipe 15 to heat the feed water in No. 2 Gao Jia; no. 2 Gao Jia steam extraction steam pipe 76 is provided with a No. 2 Gao Jia steam extraction regulating valve 74,2 and No. Gao Jia steam extraction regulating valve 74 connected with the data acquisition and control device 11, and the steam extraction regulating valve is used for opening or closing and regulating the opening under the control of the data acquisition and control device 11. A No. 2 Gao Jia stop bleed valve 75 is also provided before the No. 2 Gao Jia valve 74.
The deaerator 62 is connected with No. 3 Gao Jia through a water supply pump outlet water supply pipe 65, and No. 3 Gao Jia is connected with No. 2 Gao Jia through a No. 3 high-to-No. 2 high-adding water inlet pipe 67; no. 2 Gao Jia is connected to No. 1 Gao Jia through No. 2 high plus No. 1 Gao Jia water inlet pipe 69; the water feed pump outlet water feed pipe 65 is provided with a water feed pump 63 for pumping the water in the deaerator 62 to No. 3 Gao Jia through the water feed pump outlet water feed pipe 65. A feed water pump outlet check valve 64 is also arranged between the feed water pump 63 and the No. 3 high pressure pump 66.
Gao Jia # 1 was connected to Gao Jia # 2 by # 1 high plus # 2 Gao Jia hydrophobic tube 72, and Gao Jia # 2 was connected to Gao Jia # 3 by # 2 high plus # 3 Gao Jia hydrophobic tube 71; gao Jia 66 is connected to deaerator 62 via Gao Jia drain pipe 61, no. 3.
S2: setting the heat supply steam pressure Pg and the heat supply steam temperature Tg of the steam turbine generator unit, and judging whether the boiler 21 reaches an ignition condition before the ignition of the boiler 21, specifically: all valves are closed for boiler 21 not firing; the feed water outlet stop valve 13 of the vapor-liquid two-phase heat exchanger is opened, the feed water pump 63 is started to enable the condensed water in the deaerator 62 to flow through the feed water inlet pipe 16 of the vapor-liquid two-phase heat exchanger 1 to enter the water inlet end of the vapor-liquid two-phase heat exchanger 1 through the No. 3 Gao Jia, the No. 2 Gao Jia, the No. 1 Gao Jia and the feed water inlet pipe 16 of the vapor-liquid two-phase heat exchanger, and the condensed water flows through the feed water outlet pipe 12 of the vapor-liquid two-phase heat exchanger 1 and the feed water pipe 20 of the boiler to enter the boiler 21 from the water outlet end of the water side of the vapor-liquid two-phase heat exchanger 1, and then the boiler is ignited after the water level of the boiler 21 reaches the preset value.
The boiler 21 is ignited, the temperature and the pressure of the boiler 21 are raised gradually, the high-pressure bypass valve of the steam turbine and the temperature reduction device 26 thereof are arranged for automatic control, and the automatic control aims to keep the steam pressure in the main steam pipe 25 at the boiler starting pressure value P of the boiler q (ii) a When the steam pressure in the main steam pipe 25 is lower than the boiler-starting pressure value P of the boiler q When the steam pressure in the main steam pipe 25 is higher than the boiler-starting pressure value P, the high-pressure bypass valve of the steam turbine and the temperature reducing device 26 thereof are closed q At this time, the turbine high pressure bypass valve and its desuperheater 26 are opened.
The low-pressure bypass valve of the steam turbine and the temperature reducing device 91 thereof are automatically controlled, and the aim of the automatic control is to keep the steam pressure in the secondary heating main steam pipe 22 at P s1 ±0.05，P s1 Determining according to the parameter pressure Pg of the heating steam, and taking P s1 ＝Pg；
When the steam pressure in the secondary heating main steam pipe 22 reaches P s1 When +/-0.05, fully opening a No. 2 Gao Jia steam extraction stop valve 75, opening a No. 2 Gao Jia steam extraction regulating valve 74 to enable steam in the low-pressure bypass 90 of the steam turbine to enter a No. 2 Gao Jia through a secondary heating hot section steam extraction pipe 35, a steam extraction collecting pipe 15 and a No. 2 Gao Jia steam extraction pipe 76, and heating feed water flowing through the No. 2 Gao Jia to realize heat energy recycling; the amount of superheated steam flowing into the condenser 92 through the turbine low-pressure bypass valve and the desuperheating device 91 thereof is reduced, thereby reducing energy loss and reducing the heat load of the condenser. The feed water temperature is increased, meanwhile, the steam in the turbine low-pressure bypass 90 is reduced to flow into the condenser 92, and the heat load of the condenser 92 and the system heat loss are reduced.
When the temperature and pressure of the steam in the secondary heating main steam pipe 22 reach the heat supply steam pressure Pg and the heat supply steam temperature Tg of the steam turbine generator unit, opening corresponding valves to transmit the steam in the secondary heating main steam pipe 22 to the heat supply steam header 10 for external steam supply through the secondary heating hot section steam extraction pipe 35, the steam extraction direct steam supply pipe 87 and the heat supply steam pipe 83; the steam can be supplied to the outside without grid connection of the unit, and the thermoelectric decoupling is realized.
S3: the boiler 21 is ignited and then is heated and boosted one by one, a low-pressure bypass valve of the steam turbine and a temperature reduction device 91 thereof are arranged for automatic control, and the automatic control aims at keeping the steam pressure in the secondary heating main steam pipe 22 at P s2 ±0.05，P s2 And the starting pressure parameter of the pressure cylinder in the unit is determined. The control schematic diagram is shown in fig. 3, and in fig. 3: ps is a set value of the steam pressure of the secondary heating main steam pipe 22, pc is a measured value of the steam pressure of the secondary heating main steam pipe 22, that is, a display value of the secondary heating main steam pipe steam pressure measuring device 23, and the unit is MPa; delta e is a dead zone set value, and 0.05 is taken as unit MPa; k 1 Taking the value between 0.5 and 3 to control the feedforward coefficient; pv is a pressure command signal, cv is a flow command signal, kc is a conversion coefficient for converting the pressure command signal Pv into the flow command signal Cv, and is determined by the characteristics of the turbine low-pressure bypass valve and the desuperheater 91 thereof; cv controls the opening of the turbine low pressure bypass valve and its desuperheater 91; the filtering line block module is a PID control model, kp is a proportionality coefficient, K D Is a differential systemNumber, K I Is an integral coefficient.
The control logic transfer function expression of fig. 3 is:
C V ＝K C P V
wherein:
when the steam temperature in the secondary heating main steam pipe 22 is higher than the heating steam temperature Tg, the corresponding valve is opened to lead the low-temperature steam in the secondary heating cold section steam pipe 30 into the steam extraction direct steam supply pipe 87 through the secondary heating cold section steam extraction pipe 31, and the low-temperature steam is mixed with the high-temperature steam extracted from the secondary heating main steam pipe 22 through the secondary heating hot section steam extraction pipe 35 to ensure that the steam temperature at the heating steam header 10 is the heating steam temperature Tg;
s4: and the boiler 21 continues to raise the temperature and the pressure, when the pressure and the temperature of the steam in the secondary heating main steam pipe 22 reach the starting pressure and the starting temperature of the steam turbine generator unit respectively, corresponding valves are opened to enable the steam in the secondary heating main steam pipe 22 to enter the intermediate pressure cylinder 52 to flush the steam turbine, and grid-connected power generation is performed after the rated rotating speed is reached.
As the electric power of the generator 59 is increased, the fuel input by the boiler 21 is increased, and the steam parameters in the main steam pipe 25 and the secondary heating main steam pipe 22 are increased; when the temperature Tg of the steam at the position of the heat supply steam header 10 cannot be reduced by adjusting the secondary heating cold-section steam extraction pipe 31 and the secondary heating hot-section steam extraction pipe 35, the steam-liquid two-phase heat exchanger 1 is put into operation, the high-temperature steam in the steam extraction collecting pipe 15 is input into the steam-liquid two-phase heat exchanger 1 to carry out steam-liquid heat exchange with the water extracted from the No. 1 Gao Jia, the high-temperature steam is cooled, and the mixed steam temperature is stabilized at the temperature Tg of the heat supply steam after the cooled steam is mixed with the high-temperature steam in the steam extraction direct steam supply pipe 87 through the steam supply main pipe 5;
s5: the water temperature after heat exchange by the vapor-liquid two-phase heat exchanger 1 rises and then flows into the boiler 21 through the boiler feed pipe 20. After the vapor-liquid two-phase heat exchanger 1 is put into operation, when the liquid level measuring device 79 of the vapor-liquid two-phase heat exchanger sends a liquid level alarm signal, the condensed water in the vapor-liquid two-phase heat exchanger 1 is discharged to the deaerator 62 through the vapor-liquid two-phase heat exchanger drain pipe 60 for recycling.
The gas-liquid two-phase heat exchanger 1 is withdrawn from operation only by closing the gas inlet regulating valve 14 and the gas supply main pipe stop valve 82 of the gas-liquid two-phase heat exchanger; the unit is required to be stopped and the unit is stopped in a normal mode.
The steam extraction flow of the secondary heating cold section steam extraction pipe 31 and the secondary heating hot section steam extraction pipe 35 can be adjusted in real time to meet the requirement of heat supply steam flow, and the temperature of mixed steam is controlled by the steam extraction direct steam supply pipe temperature measuring device 36 through different steam extraction amount ratios of the secondary heating cold section steam extraction pipe 31 and the secondary heating hot section steam extraction pipe 35; the vapor-liquid two-phase flow heat exchanger is provided with a vapor-liquid two-phase heat exchanger water supply bypass pipe 18 and a vapor-liquid two-phase heat exchanger water supply bypass valve 19, and the temperature of the outlet vapor of the vapor-liquid two-phase flow heat exchanger 1 is measured by a vapor temperature measuring device 6 of a vapor supply main pipe and is regulated and controlled by the water supply flow flowing through the vapor-liquid two-phase flow heat exchanger 1; the system can realize the flexible regulation and control of the steam inlet temperature and the steam outlet temperature of the steam-liquid two-phase flow heat exchanger 1;
meanwhile, the steam temperature of the secondary heating main steam pipe 22 can be controlled by adjusting the steam extraction flow of the secondary heating cold section steam extraction pipe 31, so that the steam temperature of the secondary heating main steam pipe 22 reaches a rated value or the set starting temperature; because the flexibility of temperature control is enhanced, the requirement of heat supply of a unit on the power of a generator is very low, and the incidence relation between the heat supply and the power generation power is greatly reduced; when the unit is started, steam in the secondary heating main steam pipe 22 can enter the steam-liquid two-phase heat exchanger 1 for heating water by extracting steam through the secondary heating hot section steam extraction pipe 35, so that the phenomenon that the steam in the secondary heating main steam pipe 22 passes through the steam turbine low-pressure bypass 83, the steam turbine low-pressure bypass valve and the temperature reduction device 85 and then is discharged into the condenser 85 when the steam turbine does not enter the steam is reduced, the heat load of the condenser is reduced, the energy consumption is reduced, and the effects of saving energy and reducing consumption are achieved.
The case of changing 300MW pure condensation into a steam extraction and heat supply unit is further illustrated, and the main design parameters of the adopted steam-liquid two-phase heat exchanger are shown in Table 1. The steam turbine is a subcritical, once intermediate reheating, two-cylinder two-steam-exhaust and condensing steam turbine, and the model is as follows: n300-16.7/538/538; the main design parameters of the steam turbine are shown in table 2 by adopting the starting mode of the intermediate pressure cylinder. The main design parameters of the subcritical pi-shaped coal-fired boiler with the model of SG-1025/17.5-M8, control circulation, once intermediate reheating, single hearth, four-corner tangential firing mode, swinging nozzle temperature regulation, balanced ventilation, solid slag discharge, all-steel suspension structure and open-air arrangement are shown in Table 3. The heating steam pressure and temperature are designed to be Pg =1.2MPa and Tg =300 ℃.
TABLE 1 Main design parameters
TABLE 2 Main design parameters of the unit
TABLE 3 boiler design Main parameters
The operation mode is explained by taking the cold-state starting of the unit as an example, and the operation mode is specifically as follows:
all regulating valves and stop valves of the boiler which are not ignited are closed, the water supply bypass regulating valve 19 of the vapor-liquid two-phase heat exchanger is closed, the water supply outlet stop valve 13 of the vapor-liquid two-phase heat exchanger is opened, the water supply inlet regulating valve 17 of the vapor-liquid two-phase heat exchanger is opened, the water supply pump 63 is started to enable condensed water in the deaerator 62 to flow through the water supply pump outlet check valve 64, the water supply pump outlet water supply pipe 65, the No. 3 Gao Jia, the No. 3 high to No. 2 high water adding inlet pipe 67, the No. 2 Gao Jia 68, the No. 2 high to No. 1 Gao Jia water inlet pipe 69, the No. 1 zxft 3425, the water supply inlet regulating valve 17 of the vapor-liquid two-phase heat exchanger, the water supply inlet pipe 16 of the vapor-liquid two-phase heat exchanger, the water side of the vapor-liquid two-phase heat exchanger 1, the water supply outlet pipe 12 of the vapor-liquid two-phase heat exchanger, the water outlet stop valve 13 of the water supply outlet of the vapor-liquid two-phase heat exchanger, the water inlet water supply pipe 20 of the boiler and the boiler 21 and the like to enter the boiler 21, and the ignition conditions are provided after the boiler is normal, and the water level of the boiler is adjusted and controlled by the water level regulating valve 17 of the water supply inlet of the vapor-liquid two-phase heat exchanger.
The boiler 21 is ignited, the temperature and the pressure of the boiler 21 are raised gradually and gradually after the ignition, the high-pressure bypass valve of the steam turbine and the temperature reduction device 26 thereof are arranged for automatic control, the automatic control aims at keeping the steam pressure in the main steam pipe 25, namely the steam pressure in the main steam pipe is displayed by the steam pressure measuring device 88 at the boiler starting pressure value P of the boiler q =4.0MPa, when the steam pressure in the main steam pipe 25 is lower than the boiler-starting pressure value P of the boiler q When the pressure is not less than 4.0MPa, the high-pressure bypass valve of the steam turbine and the temperature reduction device 26 are closed, and when the steam pressure in the main steam pipe 25 is higher than the boiler-starting pressure value P of the boiler q And when the pressure is not higher than 4.0MPa, the high-pressure bypass valve of the steam turbine and the temperature reduction device 26 of the high-pressure bypass valve are opened, and the display value of the main steam pipe steam pressure measuring device 88 is kept to be 4.0MPa.
The low-pressure bypass valve of the steam turbine and the temperature reducing device 91 thereof are automatically controlled, and the aim of the automatic control is to keep the steam pressure in the secondary heating main steam pipe 22, namely the display value of the secondary heating main steam pipe steam pressure measuring device 23 at P s1 ±0.05，P s1 Determining according to the heating steam parameter pressure Pg, and taking P s1 = Pg =1.2MPa; is less than P s1 -0.05 turbine low pressure bypass valve and its desuperheating device 91 closed, higher than P s1 +0.05 turbine low pressure bypass valve and its desuperheater 91 are opened to maintain the value Pc of the secondary heating main steam pipe steam pressure measuring device 23 as P s1 Plus or minus 0.05; the control logic diagram is shown in FIG. 3, where Ps = P s1 ＝1.2MPa。
When the steam pressure in the secondary heating main steam pipe 22 reaches P s1 When +/-0.05, a No. 2 Gao Jia steam extraction stop valve 75 is fully opened, a No. 2 Gao Jia steam extraction regulating valve 74 is opened, steam in the low-pressure bypass 90 of the steam turbine enters a No. 2 Gao Jia through a secondary heating hot section steam extraction pipe 35, a steam extraction collecting pipe 15 and a No. 2 Gao Jia steam extraction pipe 76, and the steam flows through a No. 2 high steam extraction pipe68 of feed water is added for heating, so that the heat energy is recycled; and the amount of superheated steam flowing into the condenser 92 through the turbine low-pressure bypass valve and the desuperheating device 91 thereof is reduced, thereby reducing energy loss and reducing the heat load of the condenser.
The feed water temperature is increased, and meanwhile, the steam in the turbine low-pressure bypass 90 is reduced to flow into the condenser 92, so that the heat load of the condenser 92 and the heat loss of a system are reduced.
When the temperature and the pressure of steam in the secondary heating main steam pipe 22 reach the heating steam pressure Pg =1.2MPa and the heating steam temperature Tg =300 ℃ of the turbo generator set, fully opening the secondary heating section steam extraction stop valve 45, the steam extraction direct steam supply regulating valve 86 and the heating steam pipe stop valve 8, opening the secondary heating section steam extraction regulating valve 44 and the heating steam regulating valve 9 to supply steam to the heating steam header 10, so that the steam in the secondary heating main steam pipe 22 is transmitted to the heating steam header 10 through the secondary heating section steam extraction pipe 35, the steam extraction direct steam supply pipe 87 and the heating steam pipe 83 to supply steam to the outside; the steam can be supplied to the outside without grid connection of the unit, and the thermoelectric decoupling is realized.
The boiler 21 is ignited and then is heated and pressurized gradually, a low-pressure bypass valve of the steam turbine and a temperature reduction device 91 thereof are arranged for automatic control, and the aim of the automatic control is to keep the steam pressure in the secondary heating main steam pipe 22, namely the display value of a secondary heating main steam pipe steam pressure measuring device 23 is P s2 ±0.05，P s2 Determining by starting pressure parameter of medium pressure cylinder of machine set, taking P s2 =1.5MPa. The control schematic diagram is shown in fig. 3, wherein Ps = P s2 =1.5MPa. When the temperature display value Tc of the secondary heating main steam pipe steam temperature measuring device 24 is greater than the heating steam temperature value Tg =300 ℃, the secondary heating cold section steam extraction stop valve 33 is fully opened, the secondary heating cold section steam extraction regulating valve 34 is opened and automatic operation is carried out, the purpose is to enable the mixed steam temperature to be the temperature value Tg =300 ℃ of the heating steam parameter, namely the display value of the heating steam temperature measuring device 85 is 300 ℃, and the steam supply flow is controlled by the steam extraction direct steam supply regulating valve 86.
The boiler 21 continues to raise the temperature and boost the pressure, when the pressure and the temperature of the steam in the secondary heating main steam pipe 22 respectively reach the starting pressure of 1.5MPa and the starting temperature of 380 ℃ of the turbo generator unit, the intermediate pressure cylinder regulating valve 51 is opened to enable the steam in the secondary heating main steam pipe 22 to enter the intermediate pressure cylinder 52 to flush the steam turbine, and grid-connected power generation is carried out after the rated rotating speed is reached.
As the electric power of the generator 59 is increased, the fuel input by the boiler 21 is increased, and the steam parameters in the main steam pipe 25 and the secondary heating main steam pipe 22 are increased; when the temperature Tg =300 ℃ of steam at the position of the heat supply steam header 10 cannot be reduced by adjusting the secondary heating cold-section steam extraction pipe 31 and the secondary heating hot-section steam extraction pipe 35, the steam-liquid two-phase heat exchanger 1 is put into operation, the steam supply main pipe stop valve 82 is fully opened, the steam inlet adjusting valve 14 of the steam-liquid two-phase heat exchanger is opened and automatic operation is carried out, the automatic target is set, the display value of the heat supply steam temperature measuring device 85 is stabilized at the temperature value Tg =300 ℃ of parameters of the heat supply steam, high-temperature steam in the steam extraction collecting pipe 15 is input into the steam-liquid two-phase heat exchanger 1 and carries out steam-liquid heat exchange with water extracted from the No. 1 Gao Jia to carry out cooling on the high-temperature steam, the cooled steam is mixed with the high-temperature steam in the steam extraction direct steam supply pipe 87 through the steam supply main pipe 5 in the heat supply steam pipe 83, the mixed steam temperature is stabilized at the temperature Tg =300 ℃ of the heat supply steam, and the steam supply parameters are ensured to meet the requirements.
When the load of the unit is increased by one step, the high pressure cylinder 50 also starts to feed steam, the low pressure bypass valve of the steam turbine and the temperature reducing device 91 thereof are completely closed, the high pressure bypass valve of the steam turbine and the temperature reducing device 26 thereof are also completely closed, in order to meet the requirement that the display value of the temperature measuring device 85 of the steam supply steam is stable at the temperature value Tg =300 ℃ of the parameter of the steam supply steam, the steam extraction direct steam supply regulating valve 86 is gradually closed and completely closed, the temperature of the steam supply steam is regulated by the steam inlet regulating valve 14 of the steam-liquid two-phase heat exchanger, and when the display value of the steam temperature measuring device 6 of the steam supply main pipe on the steam supply main pipe 5 is lower than the temperature value Tg =300 ℃ of the parameter of the steam supply steam, the water supply bypass regulating valve 19 of the steam-liquid two-phase heat exchanger can be properly opened, so that the display value of the steam temperature measuring device 6 of the steam supply main pipe is stable at the temperature value Tg =300 ℃ of the parameter of the steam supply steam; in order to maintain the stability of the value displayed by the steam supply main pipe steam pressure measuring device 7 on the steam supply main pipe 5 at the pressure value Pg =1.2MPa of the parameter of the heat supply steam, the real-time automatic adjustment can be carried out by fully opening a No. 2 Gao Jia heating steam supply stop valve 81 and opening a No. 2 Gao Jia heating steam supply adjusting valve 80.
After the vapor-liquid two-phase heat exchanger 1 is put into operation, the stop valve 78 of the drain pipe of the vapor-liquid two-phase heat exchanger is opened, when the liquid level measuring device 79 of the vapor-liquid two-phase heat exchanger sends out a liquid level alarm signal, the stop valve is automatically opened until the alarm signal disappears, the stop valve is automatically closed after 30 seconds of delay, and condensed water is discharged to the deaerator 62 through the drain pipe 60 of the vapor-liquid two-phase heat exchanger for recycling;
after the vapor-liquid two-phase heat exchanger 1 is put into operation, the No. 2 Gao Jia steam extraction regulating valve 74 is used as an auxiliary regulating means to participate in regulating the steam inlet flow and the steam outlet temperature of the vapor-liquid two-phase heat exchanger 1 as required; also used as a guarantee means for heating a steam source by No. 2 Gao Jia when the steam-liquid two-phase heat exchanger 1 is out of operation;
the gas-liquid two-phase heat exchanger 1 is out of operation only by closing the gas-liquid two-phase heat exchanger gas inlet regulating valve 14 and the gas supply main pipe stop valve 82; the unit is required to be stopped and the unit is stopped in a normal mode.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present application, it should be understood that the division of the unit is only one division of logical functions, and other division manners may be used in actual implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A steam extraction and heat supply regulation and control method for a secondary heating steam turbine generator unit is characterized in that a boiler (21) of the steam turbine generator unit is connected with an intermediate pressure cylinder (52) through a secondary heating main steam pipe (22); the high pressure cylinder (50), the intermediate pressure cylinder (52) and the low pressure cylinder (58) are connected in sequence; the low-pressure cylinder (58) is connected with the condenser (92); the high-pressure cylinder (50) is connected with the boiler (21) through a secondary heating cold section steam pipe (30); the boiler (21) is connected with the intermediate pressure cylinder (52) through a secondary heating main steam pipe (22); the boiler (21) is connected with the high-pressure cylinder (50) through a main steam pipe (25);
the method is characterized in that: the method comprises the following steps:
s1: the steam-liquid two-phase heat exchanger (1) is connected, and the steam inlet end at the steam side of the steam-liquid two-phase heat exchanger (1) is communicated with a steam extraction direct steam supply pipe (87) through a steam extraction collecting pipe (15); one path of a steam outlet end at the steam side of the steam-liquid two-phase heat exchanger (1) is connected with a heat supply steam header (10) through a steam supply main pipe (5) and a heat supply steam pipe (83), and the other path is connected with No. 2 Gao Jia (68) through the steam supply main pipe (5) and a No. 2 Gao Jia heating steam supply pipe (73); connecting a water inlet end of a water side of the vapor-liquid two-phase heat exchanger (1) with a water supply inlet pipe (16) of the vapor-liquid two-phase heat exchanger and a water supply pipe (18) of the vapor-liquid two-phase heat exchanger to No. 1 Gao Jia (70); the water outlet end of the water side of the vapor-liquid two-phase heat exchanger (1) is connected with a boiler (21) through a vapor-liquid two-phase heat exchanger water supply outlet pipe (12) and a boiler water supply pipe (20); a feed water outlet stop valve (13) of the vapor-liquid two-phase heat exchanger is arranged on the feed water outlet pipe (12) of the vapor-liquid two-phase heat exchanger;
communicating a steam extraction collecting pipe (15) with a No. 2 heating steam supply pipe (73) through a No. 2 Gao Jia steam extraction pipe (76) and a No. 2 Gao Jia;
a steam-liquid two-phase heat exchanger water supply bypass valve (19) and a pipeline thereof are arranged between a steam-liquid two-phase heat exchanger water supply pipe (18) and a boiler water supply pipe (20);
a secondary heating main steam pipe (22) is communicated with a heat supply steam header (10) through a secondary heating section steam extraction pipe (35), a steam extraction direct steam supply pipe (87) and a heat supply steam pipe (83) in sequence;
communicating a secondary heating cold section steam pipe (30) with a steam extraction direct steam supply pipe (87) through a secondary heating cold section steam extraction pipe (31);
the deaerator (62) is connected with No. 3 Gao Jia (66) through a water supply pipe (65) at the outlet of a water supply pump;
connecting Gao Jia (70) No. 1, gao Jia (68) No. 2 and Gao Jia (66) No. 3 in sequence through pipelines;
s2: setting heat supply steam pressure Pg and heat supply steam temperature Tg of a steam turbine generator unit, igniting a boiler (21), heating and boosting the boiler (21) one by one, and when the steam temperature and pressure in a secondary heating main steam pipe (22) reach the heat supply steam pressure Pg and the heat supply steam temperature Tg of the steam turbine generator unit, opening a corresponding valve to transmit steam in the secondary heating main steam pipe (22) to a heat supply steam header (10) through a secondary heating hot section steam extraction pipe (35), a direct steam extraction supply pipe (87) and a heat supply steam pipe (83) for external steam supply;
s3: after the boiler (21) is ignited, the temperature and the pressure are raised gradually, when the temperature of steam in the secondary heating main steam pipe (22) is higher than the temperature Tg of heat supply steam, a corresponding valve is opened to lead low-temperature steam in a secondary heating cold section steam pipe (30) into a steam extraction direct steam supply pipe (87) through a secondary heating cold section steam extraction pipe (31), and the low-temperature steam is mixed with high-temperature steam extracted from the secondary heating main steam pipe (22) through a secondary heating hot section steam extraction pipe (35) to ensure that the temperature of the steam at the position of the heat supply steam header (10) is the temperature Tg of the heat supply steam;
s4: the boiler (21) continues to raise the temperature and boost the pressure, when the steam at the position of the heat supply steam header (10) cannot be reduced to the heat supply steam temperature Tg by adjusting the secondary heating cold section steam extraction pipe (31) and the secondary heating hot section steam extraction pipe (35), the steam-liquid two-phase heat exchanger (1) is put into operation, the high-temperature steam in the steam extraction manifold (15) is input into the steam-liquid two-phase heat exchanger (1) to carry out steam-liquid heat exchange with the water extracted from No. 1 Gao Jia (70), the high-temperature steam is cooled, and the mixed steam temperature is stabilized at the heat supply steam temperature Tg after the cooled steam is mixed with the high-temperature steam in the steam extraction direct steam supply pipe (87) through the steam supply main pipe (5) in the heat supply steam pipe (83);
s5: the water temperature after heat exchange of the vapor-liquid two-phase heat exchanger (1) is increased and then flows into a boiler (21) through a boiler water feeding pipe (20);
the vapor-liquid two-phase heat exchanger (1) comprises a water inlet and outlet area and a heat exchange area, wherein the water inlet and outlet area is arranged above the heat exchange area; a U-shaped heat exchange tube (4) of the vapor-liquid two-phase heat exchanger is arranged in the vapor-liquid two-phase heat exchanger (1); the water inlet and the water outlet of the U-shaped heat exchange tube (4) of the vapor-liquid two-phase heat exchanger are respectively arranged in a water inlet and water outlet area at the upper part of the vapor-liquid two-phase heat exchanger (1), wherein the water inlet of the U-shaped heat exchange tube (4) of the vapor-liquid two-phase heat exchanger is communicated with a water supply inlet tube (16) of the vapor-liquid two-phase heat exchanger, and the water outlet of the U-shaped heat exchange tube (4) of the vapor-liquid two-phase heat exchanger is communicated with a water supply outlet tube (12) of the vapor-liquid two-phase heat exchanger; the bottom of the U-shaped heat exchange tube (4) of the vapor-liquid two-phase heat exchanger extends to the bottom of the heat exchange area; the steam inlet end of the steam side of the steam-liquid two-phase heat exchanger (1) is arranged at the upper part of the heat exchange area and is close to the bottom of the water inlet and outlet area; the steam outlet end of the steam side of the steam-liquid two-phase heat exchanger (1) is arranged at the bottom of the heat exchange area;
the inner walls of two sides of the heat exchange area of the vapor-liquid two-phase heat exchanger (1) are respectively fixed with a stepped vapor-liquid two-phase heat exchanger vapor guide plate (3), so that the steam entering the vapor-liquid two-phase heat exchanger (1) flows in an S-shaped route from top to bottom.
2. The secondary heating steam turbine generator unit steam extraction and heat supply regulation and control method according to claim 1, characterized in that: before the boiler (21) is ignited in the step S2, whether the boiler (21) reaches an ignition condition is judged, and the method specifically comprises the following steps: all valves of the boiler (21) are closed when not fired; the method comprises the steps of opening a water supply outlet stop valve (13) of a vapor-liquid two-phase heat exchanger, starting a water supply pump (63) to enable condensed water in a deaerator (62) to flow through a No. 3 Gao Jia (66), a No. 2 Gao Jia (68), a No. 1 Gao Jia (70) and a vapor-liquid two-phase heat exchanger water supply inlet pipe (16) to enter a water inlet end of a vapor-liquid two-phase heat exchanger (1) at the water side, enabling the condensed water to flow through a vapor-liquid two-phase heat exchanger water supply outlet pipe (12) from a water outlet end of the vapor-liquid two-phase heat exchanger (1) to enter a boiler (21) through a vapor-liquid two-phase heat exchanger water supply outlet pipe (12) and a boiler water supply pipe (20), and igniting when the water level of the boiler (21) reaches a preset value.
3. The secondary heating steam turbine generator unit steam extraction and heat supply regulation and control method according to claim 1, characterized in that: the step S2 further includes: the high-pressure bypass valve of the steam turbine and the temperature reduction device (26) thereof are automatically controlled, and the aim of the automatic control is to keep the steam pressure in the main steam pipe (25) at the boiler starting pressure value P q (ii) a When the steam pressure in the main steam pipe (25) is lower than the boiler-starting pressure value P of the boiler q When the steam pressure in the main steam pipe (25) is higher than the boiler-starting pressure value P of the boiler, the high-pressure bypass valve of the steam turbine and the temperature reduction device (26) thereof are closed q At this time, the turbine high pressure bypass valve and its desuperheating device (26) are opened.
4. The secondary heating steam turbine generator unit steam extraction and heat supply regulation and control method according to claim 1, characterized in that: the step S2 further includes: the method also comprises the step of setting a low-pressure bypass valve of the steam turbine and automatically controlling a temperature reduction device (91) of the low-pressure bypass valve, wherein the aim of automatic control is to keep the steam pressure in a secondary heating main steam pipe (22) at P s1 +/-0.05, determining according to the parameter pressure Pg of heat supply steam, and taking P s1 =Pg；
When the steam pressure in the secondary heating main steam pipe (22) reaches P s1 When +/-0.05, fully opening a No. 2 Gao Jia steam extraction stop valve (75), opening a No. 2 Gao Jia steam extraction regulating valve (74) to enable steam in a low-pressure bypass (90) of the steam turbine to pass through a secondary heating hot section steam extraction pipe (35) and a steam extraction collecting pipe (C and C)15 Gao Jia steam extraction steam pipe (76) enters Gao Jia (68) 2, and the water supply flowing through Gao Jia (68) 2 is heated, so that the heat energy is recycled; and the amount of superheated steam flowing into the condenser (92) through the turbine low-pressure bypass valve and the temperature reduction device (91) thereof is reduced, thereby reducing energy loss and reducing the heat load of the condenser.
5. The secondary heating steam turbine generator unit steam extraction and heat supply regulation and control method according to claim 1, characterized in that: the step S3 further includes: the low-pressure bypass valve of the steam turbine and the temperature reduction device (91) thereof are arranged for automatic control, and the automatic control aims to keep the steam pressure in the secondary heating main steam pipe (22) at P s2 ±0.05，P s2 And the starting pressure parameter of the pressure cylinder in the unit is determined.
6. The secondary heating steam turbine generator unit steam extraction and heat supply regulation and control method according to claim 1, characterized in that: the step S3 further includes: when the pressure and the temperature of the steam in the secondary heating main steam pipe (22) respectively reach the starting pressure and the starting temperature of the turbo generator set, the corresponding valve is opened to enable the steam in the secondary heating main steam pipe (22) to enter the intermediate pressure cylinder (52) to flush the steam turbine, and the steam turbine is connected to the grid to generate power after reaching the rated rotating speed.
7. The secondary heating steam turbine generator unit steam extraction and heat supply regulation and control method according to claim 1, characterized in that: the step S1 further includes: the bottom of the vapor-liquid two-phase heat exchanger (1) is connected with a deaerator (62) through a vapor-liquid two-phase heat exchanger drain pipe (60), and a vapor-liquid two-phase heat exchanger liquid level measuring device (79) is arranged at the bottom of the vapor-liquid two-phase heat exchanger (1);
after the vapor-liquid two-phase heat exchanger (1) is put into operation, when a liquid level alarm signal is sent by a liquid level measuring device (79) of the vapor-liquid two-phase heat exchanger, condensed water in the vapor-liquid two-phase heat exchanger (1) is discharged to a deaerator (62) through a drain pipe (60) of the vapor-liquid two-phase heat exchanger for recycling.
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| JP6452465B2 (en) * | 2015-01-20 | 2019-01-16 | 大阪瓦斯株式会社 | Heat supply system |
| JP2018054246A (en) * | 2016-09-30 | 2018-04-05 | 常石造船株式会社 | Steam generation system |
| JP6971605B2 (en) * | 2017-03-30 | 2021-11-24 | 大阪瓦斯株式会社 | Fuel cell system |
| CN109578973B (en) * | 2018-11-02 | 2024-01-02 | 清华大学 | Deaerator system and working method |
| CN111485964B (en) * | 2020-04-17 | 2022-05-10 | 山西定慧能源科技有限公司 | Thermoelectric decoupling method for coal-fired power plant based on turboexpander |
| CN111663966B (en) * | 2020-05-09 | 2022-09-09 | 广西电网有限责任公司电力科学研究院 | Running area testing system for cogeneration unit |
| CN112065520B (en) * | 2020-09-11 | 2021-04-27 | 国电科学技术研究院有限公司 | Cold and hot re-cooperative steam supply system and method |
| CN113202580A (en) * | 2021-04-21 | 2021-08-03 | 晟源高科(北京)科技有限公司 | Thermoelectric decoupling system based on bypass regulation |
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