CN113107623B - Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure cylinder steam turbine - Google Patents
Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure cylinder steam turbine Download PDFInfo
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- CN113107623B CN113107623B CN202110527624.9A CN202110527624A CN113107623B CN 113107623 B CN113107623 B CN 113107623B CN 202110527624 A CN202110527624 A CN 202110527624A CN 113107623 B CN113107623 B CN 113107623B
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- 238000000605 extraction Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims description 16
- 238000003303 reheating Methods 0.000 claims abstract description 49
- 238000002955 isolation Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004891 communication Methods 0.000 abstract description 2
- 230000002829 reductive effect Effects 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
- 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
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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
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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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
- F01K13/00—General layout or general methods of operation of complete plants
-
- 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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a device for improving heat supply steam extraction parameters during low-load operation of a double-low pressure cylinder steam turbine, which comprises a high pressure cylinder, a medium pressure cylinder, a boiler reheater, an A low pressure cylinder, a B low pressure cylinder, an A low pressure cylinder steam inlet butterfly valve, a B low pressure cylinder steam inlet butterfly valve, a low pressure first-stage steam extraction and a low pressure second-stage steam extraction; the high-pressure cylinder steam outlet is connected to a boiler reheater through a reheating cold section, the boiler reheater is connected to a medium-pressure cylinder steam inlet through a reheating hot section, and the medium-pressure cylinder steam outlet is respectively connected to a low-pressure cylinder A and a low-pressure cylinder B steam inlet. The beneficial effects of the invention are as follows: according to the invention, the steam inlet butterfly valves are additionally arranged at the steam inlet communication pipes of the two low-pressure cylinders respectively, the pressure transmitters are additionally arranged behind the butterfly valves, the steam pressure of the steam inlet low-pressure cylinders is monitored, and when the unit runs under low load, the heat supply and steam extraction pressure is improved by sequentially closing the opening of the steam inlet butterfly valves of the single low-pressure cylinder, so that the minimum pressure requirement of external heat supply users during the running of the unit under low load can be met, and the running economy of the unit is higher.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a device and a method for improving heat supply steam extraction parameters during low-load operation of a double-low-pressure cylinder steam turbine.
Background
With the change of the power consumption structure, the day and night peak-valley difference of the power grid is continuously increased, so that the existing peak regulation capacity cannot meet the trend of the peak regulation development of the power grid, and the thermal power unit can operate under 50% load for a long time.
At present, the coal-fired units in the Zhejiang province are all involved in deep peak regulation. The large-scale coal-fired unit, especially 60 ten thousand or more units become the main power of the power grid peak shaving, the lowest output is reduced to 40% of rated load, partial holidays are caused, and the deep peak shaving load is even reduced to 30% of load.
The Zhejiang province internal heat supply unit mainly uses industrial steam extraction heat supply, and for the unit with a heat supply steam source of a reheating cold section or a reheating hot section, due to the influence of deep peak regulation, heat supply parameters can not meet user requirements in low-load operation, and part of the unit can raise heat supply steam extraction pressure by closing a middle pressure regulating gate, so that throttling loss is generated in working steam of a middle pressure cylinder, or heat supply is performed by selecting a higher parameter steam source, such as main steam of a boiler and perforation steam extraction heat supply of a screen superheater, so that the running economy of the unit is reduced.
Disclosure of Invention
The invention aims to solve the problem that the economy is poor due to the fact that when a double-low-pressure cylinder turbine unit runs under low load, a reheat cold section or a hot section is used as a steam extraction and heat supply steam source, and when the requirements of users cannot be met, heat supply and steam extraction pressure is improved by closing a medium-pressure regulating valve, or a higher-parameter steam heat supply mode such as main steam of a boiler, punching and steam extraction of a screen type superheater is adopted, and the like, and provides a device and a method for improving heat supply and steam extraction parameters during low-load running of the double-low-pressure cylinder turbine.
The device for improving the heat supply steam extraction parameters during low-load operation of the double-low pressure cylinder steam turbine comprises a high pressure cylinder, a medium pressure cylinder, a boiler reheater, an A low pressure cylinder, a B low pressure cylinder, an A low pressure cylinder steam inlet butterfly valve, a B low pressure cylinder steam inlet butterfly valve, a low pressure first-stage steam extraction and a low pressure second-stage steam extraction; the high-pressure cylinder steam outlet is connected to a boiler reheater through a reheating cold section, the boiler reheater is connected to a medium-pressure cylinder steam inlet through a reheating hot section, and the medium-pressure cylinder steam outlet is respectively connected to a low-pressure cylinder A and a low-pressure cylinder B steam inlet; the reheating cold section is provided with a reheating cold section steam extraction heat supply and a reheating cold section steam extraction pressure transmitter, and the reheating hot section is provided with a reheating hot section steam extraction heat supply and a reheating hot section steam extraction pressure transmitter; the steam inlet of the A low-pressure cylinder is provided with a steam inlet butterfly valve of the A low-pressure cylinder, and the rear end of the steam inlet butterfly valve of the A low-pressure cylinder is provided with a rear pressure transmitter of the steam inlet butterfly valve of the A low-pressure cylinder; the steam inlet of the low-pressure cylinder B is provided with a steam inlet butterfly valve of the low-pressure cylinder B, and the rear end of the steam inlet butterfly valve of the low-pressure cylinder B is provided with a rear pressure transmitter of the steam inlet butterfly valve of the low-pressure cylinder B; the low-pressure first-stage steam extraction is provided with two branches, and the low-pressure first-stage steam extraction first branch of the A low-pressure cylinder and the low-pressure first-stage steam extraction second branch of the B low-pressure cylinder are connected to the low-pressure first-stage steam extraction in a converging way; the low-pressure second-stage steam extraction is provided with two branches, and the first branch of the low-pressure second-stage steam extraction of the A low-pressure cylinder and the second branch of the low-pressure second-stage steam extraction of the B low-pressure cylinder are connected to the low-pressure second-stage steam extraction in a converging mode.
As preferable: the two steam inlets of the medium pressure cylinder are respectively provided with a first medium pressure cylinder steam inlet regulating valve and a second medium pressure cylinder steam inlet regulating valve.
As preferable: the low-pressure first-stage steam extraction is provided with a low-pressure first-stage steam extraction check valve and a low-pressure first-stage steam extraction electric isolation valve.
As preferable: the low-pressure second-stage steam extraction is provided with a low-pressure second-stage steam extraction check valve and a low-pressure second-stage steam extraction electric isolation valve.
The test method of the device for improving the heat supply steam extraction parameters during low-load operation of the double-low-pressure cylinder steam turbine comprises the following steps:
Step 1: according to the thermal equilibrium diagram or the actual running data of the unit, determining a load value P e1 corresponding to the lowest steam extraction parameter of the unit reheat cold section or reheat hot section steam extraction heat supply parameter meeting the user requirement;
Step 2: developing a lifting, steam extraction and heat supply pressure test of a typical load working point of a low load section P e1-Pe2 of the unit, wherein P e2 is the current deep peak regulation low limit value of the unit, and equally dividing the load section P e1-Pe2 into a plurality of load points;
Step 3: taking an ith load point P i, gradually closing the A low-pressure cylinder steam inlet butterfly valve, and stopping closing the A low-pressure cylinder steam inlet butterfly valve when the lowest pressure requirement of a heat supply user is met as the steam extraction and heat supply pressure of a reheating cold section or a reheating hot section rises along with the steam extraction and heat supply pressure;
Step 4: when the steam inlet butterfly valve of the low-pressure cylinder A is closed to the lowest opening degree, and the steam extraction and heat supply pressure of the reheating cold section or the reheating hot section still does not meet the lowest pressure requirement of a heat supply user, the steam inlet butterfly valve of the low-pressure cylinder A is kept to operate at the lowest opening degree, and the steam inlet butterfly valve of the low-pressure cylinder B is closed until the heat supply and steam extraction pressure meets the lowest pressure requirement of the user;
Step 5: and (3) repeating the steps 3-4 to obtain a test method for improving the steam extraction and heat supply pressure of the reheat cold section or the reheat hot section of each typical working point of the P e1-Pe2 low-load section to meet the minimum pressure requirement of a heat supply user and related important parameters.
The beneficial effects of the invention are as follows: according to the invention, the steam inlet butterfly valves are additionally arranged at the steam inlet communication pipes of the two low-pressure cylinders respectively, the pressure transmitters are additionally arranged behind the butterfly valves, the steam pressure of the steam inlet low-pressure cylinders is monitored, and when the unit runs under low load, the heat supply and steam extraction pressure is improved by sequentially closing the opening of the steam inlet butterfly valves of the single low-pressure cylinder, so that the minimum pressure requirement of external heat supply users during the running of the unit under low load can be met, and the running economy of the unit is higher.
Drawings
FIG. 1 is a schematic diagram of an apparatus for increasing heating steam extraction parameters during low load operation of a dual low pressure cylinder turbine according to the present invention.
Reference numerals illustrate: 1-a high-pressure cylinder; 2-a middle pressure cylinder; 3-reheating cold section steam extraction and heat supply; 4-boiler reheater; 5-reheating hot section steam extraction and heat supply; 6-reheating cold section extraction pressure transmitter; 7, a reheat hot section steam extraction pressure transmitter; 8-a first medium pressure cylinder steam inlet regulating valve; 9-a second medium pressure cylinder steam inlet regulating valve; 10-A low pressure cylinder; 11-B low pressure cylinder; 12-A low pressure cylinder steam inlet butterfly valve; 13-B, a low-pressure cylinder steam inlet butterfly valve; 14-A a pressure transmitter behind a low-pressure cylinder steam inlet butterfly valve; 15-B, a pressure transmitter behind a low-pressure cylinder steam inlet butterfly valve; 16-a low-pressure first-stage steam extraction check valve; 17-a low-pressure first-stage steam extraction electric isolation valve; 18-low pressure first stage steam extraction; 19-a low-pressure second-stage steam extraction check valve; 20-a low-pressure second-stage steam extraction electric isolation valve; 21-low pressure second stage extraction; 22-a first branch of low-pressure first stage steam extraction; 23-a low-pressure first stage extraction second branch; 24-a low-pressure second stage extraction first branch; 25-second branch of low-pressure second stage steam extraction.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
The device for improving the heat supply steam extraction parameters during low-load operation of the double-low pressure cylinder steam turbine comprises a high pressure cylinder 1, a medium pressure cylinder 2, a boiler reheater 4, an A low pressure cylinder 10, a B low pressure cylinder 11, an A low pressure cylinder steam inlet butterfly valve 12, a B low pressure cylinder steam inlet butterfly valve 13, a low pressure first-stage steam extraction 18 and a low pressure second-stage steam extraction 21; the steam outlet of the high-pressure cylinder 1 is connected to the boiler reheater 4 through a reheating cold section, the boiler reheater 4 is connected to the steam inlet of the medium-pressure cylinder 2 through a reheating hot section, and the steam outlets of the medium-pressure cylinder 2 are respectively connected to the steam inlets of the low-pressure cylinders A10 and B11; the reheating cold section is provided with a reheating cold section steam extraction heat supply 3 and a reheating cold section steam extraction pressure transmitter 6, and the reheating hot section is provided with a reheating hot section steam extraction heat supply 5 and a reheating hot section steam extraction pressure transmitter 7; the steam inlet of the A low pressure cylinder 10 is provided with an A low pressure cylinder steam inlet butterfly valve 12, and the rear end of the A low pressure cylinder steam inlet butterfly valve 12 is provided with an A low pressure cylinder steam inlet butterfly valve rear pressure transmitter 14; the steam inlet of the low-pressure cylinder B11 is provided with a low-pressure cylinder B steam inlet butterfly valve 13, and the rear end of the low-pressure cylinder B steam inlet butterfly valve 13 is provided with a low-pressure cylinder B steam inlet butterfly valve rear pressure transmitter 15; the low-pressure first-stage extraction steam 18 is provided with two branches, namely a low-pressure first-stage extraction steam first branch 22 of the low-pressure cylinder 10 and a low-pressure first-stage extraction steam second branch 23 of the low-pressure cylinder 11 are connected to the low-pressure first-stage extraction steam 18 in a converging way; the low-pressure second-stage extraction steam 21 is provided with two branches, and a low-pressure second-stage extraction steam first branch 24 of the low-pressure cylinder A10 and a low-pressure second-stage extraction steam second branch 25 of the low-pressure cylinder B11 are connected to the low-pressure second-stage extraction steam 21 in a converging manner.
As a preferred embodiment, the two steam inlets of the intermediate pressure cylinder 2 are respectively provided with a first intermediate pressure cylinder steam inlet regulating valve 8 and a second intermediate pressure cylinder steam inlet regulating valve 9.
As a preferred embodiment, the low-pressure first-stage extraction 18 is provided with a low-pressure first-stage extraction check valve 16 and a low-pressure first-stage extraction electric isolation valve 17; the low-pressure second-stage steam extraction 21 is provided with a low-pressure second-stage steam extraction check valve 19 and a low-pressure second-stage steam extraction electric isolation valve 20.
Example two
According to the invention, the steam pressure of the low pressure cylinder is monitored by arranging the A low pressure cylinder steam inlet butterfly valve 12 and the B low pressure cylinder steam inlet butterfly valve 13 on the steam inlet pipelines of the A low pressure cylinder 10 and the B low pressure cylinder 11 respectively, and arranging the A low pressure cylinder steam inlet butterfly valve rear pressure transmitter 14 and the B low pressure cylinder steam inlet butterfly valve rear pressure transmitter 15 respectively after the steam inlet butterfly valves, and when the unit runs under low load, the reheat cold section steam extraction heat supply pressure or the reheat hot section steam extraction heat supply pressure is improved by closing the A low pressure cylinder steam inlet butterfly valve 12 or the B low pressure cylinder steam inlet butterfly valve 13 in sequence.
In the process of closing the low-pressure cylinder steam inlet butterfly valve, the blast loss caused by the small low-pressure steam inlet flow rate of the last stage of blades of the low-pressure cylinder is avoided, the minimum steam inlet flow rate of the low-pressure cylinder can be determined by a manufacturer through thermal calculation and is characterized by a low-pressure steam inlet pressure value behind the butterfly valve, and the corresponding butterfly valve opening is the valve low limit value; or the exhaust temperature of the low-pressure final stage is used as a monitoring target, the exhaust temperature alarm value of the low-pressure cylinder is used as a criterion, the exhaust temperature corresponding to the minimum opening of the exhaust butterfly valve of the low-pressure cylinder does not exceed the alarm value, and the opening of the exhaust butterfly valve is adjusted on the premise of not exceeding the alarm value.
In fig. 1, the low-pressure first-stage extraction steam 18 has two branches, and steam is respectively extracted from the low-pressure cylinder A10 and the low-pressure cylinder B11 symmetrically and is converged into one path to enter the low-pressure first-stage heater; the low pressure second stage extraction 21 is similar in structure to the low pressure first stage extraction 18 and will not be described.
For a unit with two branches for extracting steam at a certain low pressure level and symmetrically extracting steam from two low pressure cylinders respectively, the steam channeling phenomenon can occur in the two branches during closing of a steam inlet butterfly valve of a first low pressure cylinder: the first low pressure cylinder is reduced in extraction pressure due to the fact that the pressure of the ventilation part is reduced, the extraction branch of the other low pressure cylinder can enter the extraction branch of the first low pressure cylinder to enter the first low pressure cylinder, cooling steam of the first low pressure cylinder is increased, blowing loss can be effectively restrained, and the opening of a butterfly valve of the first low pressure cylinder for entering steam can be further reduced. More specifically, taking the low-pressure first-stage steam extraction 18 as an example, in the process of closing the low-pressure cylinder steam inlet butterfly valve 12, the pressure of the two branches of the low-pressure first-stage steam extraction of the low-pressure 1 st stage is unbalanced, the pressure of the low-pressure first-stage steam extraction second branch 23 of the low-pressure cylinder 11 is higher than that of the low-pressure first-stage steam extraction first branch 22 of the low-pressure cylinder 10, and no check valve exists on the two steam extraction branch pipes, so that steam in the pipeline of the low-pressure first-stage steam extraction second branch 23 enters the low-pressure cylinder 10 through the low-pressure first-stage steam extraction first branch 22, the last-stage steam flow of the low-pressure cylinder 10 is increased, which is equivalent to the increase of the cooling steam flow of the low-pressure cylinder 10, which has a certain benefit for inhibiting the blast loss, and can further reduce the opening of the butterfly valve 12 of the low-pressure cylinder steam inlet.
In general, for a dual low pressure cylinder unit, low pressure cylinder efficiency refers to the average of the two low pressure cylinder efficiencies, and the two low pressure cylinder inlet flows are considered to be evenly distributed. It is well known that the low pressure cylinder efficiency curve drops rapidly with decreasing exhaust volumetric flow, and that the low pressure cylinder is at a lower efficiency level when the unit is operating in the low load section.
According to the invention, the two low-pressure cylinders are additionally provided with the steam inlet butterfly valves, so that under the premise of keeping a certain load, the steam inlet flow of the two low-pressure cylinders can be redistributed in the process of closing the steam inlet butterfly valve of the first low-pressure cylinder, namely, the steam inlet flow of the first low-pressure cylinder can be reduced, and the steam inlet flow of the second low-pressure cylinder can be correspondingly increased; when the second low pressure cylinder efficiency increase value is greater than the first low pressure cylinder efficiency decrease value, the average efficiency value of both low pressure cylinders is increased. More specifically, under the premise of keeping a certain load, in the process of closing the low-pressure cylinder A steam inlet butterfly valve 12, the steam inlet flows of the two low-pressure cylinders are redistributed, namely, the steam inlet flow of the low-pressure cylinder A10 is reduced, and the steam inlet flow of the low-pressure cylinder B11 is correspondingly increased. When the A low pressure cylinder steam inlet butterfly valve 12 is closed to a certain opening degree, the efficiency increasing value of the B low pressure cylinder 11 is larger than the efficiency decreasing value of the A low pressure cylinder 10, and the average efficiency values of the two low pressure cylinders are improved.
According to the invention, the two low-pressure cylinder steam inlet butterfly valves are sequentially closed, so that the heating steam extraction pressure of the reheating cold section or the reheating hot section can meet the minimum pressure requirement of an external heating user when the unit runs in a low-load section.
Example III
Taking the improvement of the steam extraction and heat supply pressure of the reheating cold section as an embodiment, the embodiment limits the minimum pressure requirement required by external heat supply users when the unit low-load section operates by sequentially closing the steam inlet butterfly valve 12 of the low-pressure cylinder A and the steam inlet butterfly valve 13 of the low-pressure cylinder B after the steam extraction and heat supply pressure of the reheating cold section is improved.
The research on a plurality of reheating cold section steam extraction heat supply units shows that: when the unit runs under low load, the pressure of the reheating cold section is relatively lower than the lowest demand pressure value of a heat supply user, and the deviation is not large. The embodiment can achieve the purpose of improving the pressure of the low-load reheating cold section to meet the requirements of heat supply users.
The method comprises the following steps:
And determining a minimum load value P e1 corresponding to the fact that the steam extraction and heat supply pressure of the reheating cold section of the unit meets the heat supply user requirement according to the unit thermal equilibrium diagram or actual operation data.
And (3) developing a steam extraction and heat supply test of a typical load working point lifting reheat cold section of a low load section P e1-Pe2 of the unit, wherein P e2 is a deep peak regulation load low limit value of the conventional unit, and equally dividing a load section P e1-Pe2 into a plurality of load points.
Step 1: taking the ith load point P i as an example, slowly closing the A low-pressure cylinder steam inlet butterfly valve 12, and recording the unit load, the opening of the A low-pressure cylinder steam inlet butterfly valve 12, the opening of the B low-pressure cylinder steam inlet butterfly valve 13, the rear pressure of the A low-pressure cylinder steam inlet butterfly valve (the pressure value of a pressure transmitter 14 behind the A low-pressure cylinder steam inlet butterfly valve), the rear pressure of the B low-pressure cylinder steam inlet butterfly valve (the pressure value of a pressure transmitter 15 behind the B low-pressure cylinder steam inlet butterfly valve), the reheat cold section steam extraction and heat supply pressure (the pressure value of a reheat cold section steam extraction pressure transmitter 6), the A low-pressure cylinder steam extraction temperature and the B low-pressure cylinder steam extraction temperature in the closing process.
Step 2: in the closing process of the steam inlet butterfly valve 12 of the low-pressure cylinder A, the steam inlet flow of the low-pressure cylinder A is reduced, the pressure of the steam inlet butterfly valve of the low-pressure cylinder A is reduced, the steam outlet temperature of the low-pressure cylinder A is increased, and the steam inlet flow of the low-pressure cylinder B is increased.
Step 3: and when the steam extraction and heat supply pressure of the reheating cold section meets the minimum pressure requirement of a heat supply user, stopping closing the steam inlet butterfly valve 12 of the low-pressure cylinder A, stopping the test, and recording the related parameter values.
Step 4: when the A low-pressure cylinder steam inlet butterfly valve 12 is closed to the lowest opening degree, the reheat cold section steam extraction and heat supply pressure still fails to meet the lowest pressure requirement of a heat supply user, the A low-pressure cylinder steam inlet butterfly valve 12 is kept at the minimum opening degree, and meanwhile the B low-pressure cylinder steam inlet butterfly valve 13 is closed.
Step 5: when the reheating cold section steam extraction and heat supply pressure meets the minimum pressure requirement of a heat supply user, closing of the B low pressure cylinder steam inlet butterfly valve 13 is stopped, and the relevant parameter values are recorded.
And (3) repeating the steps 1-5 to obtain a test method for improving the steam extraction and heat supply pressure of the reheat cold section by each typical working point of the P e1-Pe2 low-load section to meet the minimum pressure requirement of a heat supply user and related important parameters.
Claims (3)
1. The test method of the device for improving the heat supply steam extraction parameters during low-load operation of the double-low-pressure-cylinder steam turbine is characterized in that the device for improving the heat supply steam extraction parameters during low-load operation of the double-low-pressure-cylinder steam turbine comprises a high-pressure cylinder (1), a medium-pressure cylinder (2), a boiler reheater (4), an A low-pressure cylinder (10), a B low-pressure cylinder (11), an A low-pressure-cylinder steam inlet butterfly valve (12), a B low-pressure-cylinder steam inlet butterfly valve (13), a low-pressure first-stage steam extraction (18) and a low-pressure second-stage steam extraction (21); the steam outlet of the high-pressure cylinder (1) is connected to a boiler reheater (4) through a reheating cold section, the boiler reheater (4) is connected to the steam inlet of the medium-pressure cylinder (2) through a reheating hot section, and the steam outlets of the medium-pressure cylinder (2) are respectively connected to the steam inlets of the low-pressure cylinder A (10) and the low-pressure cylinder B (11); the reheating cold section is provided with a reheating cold section steam extraction heat supply (3) and a reheating cold section steam extraction pressure transmitter (6), and the reheating hot section is provided with a reheating hot section steam extraction heat supply (5) and a reheating hot section steam extraction pressure transmitter (7); the steam inlet of the A low-pressure cylinder (10) is provided with an A low-pressure cylinder steam inlet butterfly valve (12), and the rear end of the A low-pressure cylinder steam inlet butterfly valve (12) is provided with an A low-pressure cylinder steam inlet butterfly valve rear pressure transmitter (14); a steam inlet of the low-pressure cylinder (11) is provided with a steam inlet butterfly valve (13) of the low-pressure cylinder, and the rear end of the steam inlet butterfly valve (13) of the low-pressure cylinder is provided with a rear pressure transmitter (15) of the steam inlet butterfly valve of the low-pressure cylinder; the low-pressure first-stage steam extraction (18) is provided with two branches, and a low-pressure first-stage steam extraction first branch (22) of the A low-pressure cylinder (10) and a low-pressure first-stage steam extraction second branch (23) of the B low-pressure cylinder (11) are connected to the low-pressure first-stage steam extraction (18) in a converging way; the low-pressure second-stage steam extraction (21) is provided with two branches, and a low-pressure second-stage steam extraction first branch (24) of an A low-pressure cylinder (10) and a low-pressure second-stage steam extraction second branch (25) of a B low-pressure cylinder (11) are connected to the low-pressure second-stage steam extraction (21) in a converging way, and the method comprises the following steps:
step 1: according to the actual operation data of the unit, determining a load value P e1 corresponding to the lowest steam extraction parameter of the unit reheat cold section or reheat hot section steam extraction heat supply parameter meeting the user requirement;
Step 2: developing a lifting, steam extraction and heat supply pressure test of a typical load working point of a low load section P e1-Pe2 of the unit, wherein P e2 is the current deep peak regulation low limit value of the unit, and equally dividing the load section P e1-Pe2 into a plurality of load points;
Step 3: taking an ith load point P i, gradually closing the A low-pressure cylinder steam inlet butterfly valve, and stopping closing the A low-pressure cylinder steam inlet butterfly valve when the lowest pressure requirement of a heat supply user is met due to the fact that the steam extraction and heat supply pressure of a reheating cold section or a reheating hot section rises along with the rising of the steam extraction and heat supply pressure;
Step 4: when the steam inlet butterfly valve of the low-pressure cylinder A is closed to the lowest opening degree, and the steam extraction and heat supply pressure of the reheating cold section or the reheating hot section still does not meet the lowest pressure requirement of a heat supply user, the steam inlet butterfly valve of the low-pressure cylinder A is kept to operate at the lowest opening degree, and the steam inlet butterfly valve of the low-pressure cylinder B is closed until the heat supply and steam extraction pressure meets the lowest pressure requirement of the user;
Step 5: repeating the steps 3-4 to obtain a test method and related parameters for improving the steam extraction and heat supply pressure of the reheat cold section or the reheat hot section of each typical working point of the P e1-Pe2 low-load section to meet the minimum pressure requirement of a heat supply user.
2. The method for testing the device for improving the heat supply and steam extraction parameters during low-load operation of the double-low-pressure-cylinder steam turbine according to claim 1, wherein the method comprises the following steps of: the low-pressure first-stage steam extraction (18) is provided with a low-pressure first-stage steam extraction check valve (16) and a low-pressure first-stage steam extraction electric isolation valve (17).
3. The method for testing the device for improving the heat supply and steam extraction parameters during low-load operation of the double-low-pressure-cylinder steam turbine according to claim 1, wherein the method comprises the following steps of: the low-pressure second-stage steam extraction (21) is provided with a low-pressure second-stage steam extraction check valve (19) and a low-pressure second-stage steam extraction electric isolation valve (20).
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| CN114687815A (en) * | 2022-04-24 | 2022-07-01 | 中国船舶重工集团公司第七0三研究所 | Simple low-pressure cylinder cooling steam system of double-low-pressure-cylinder zero-output steam turbine set |
| CN115199346B (en) * | 2022-07-26 | 2024-06-21 | 北京全四维动力科技有限公司 | Multistage forward turbine system and method for operating the same |
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