CN214660397U - Device for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine - Google Patents
Device for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine Download PDFInfo
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- CN214660397U CN214660397U CN202121042031.5U CN202121042031U CN214660397U CN 214660397 U CN214660397 U CN 214660397U CN 202121042031 U CN202121042031 U CN 202121042031U CN 214660397 U CN214660397 U CN 214660397U
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Abstract
The utility model relates to a device for improving heat supply steam extraction parameters when a double-low pressure cylinder steam turbine operates at low load, which comprises a high pressure cylinder, a middle pressure cylinder, a boiler reheater, a low pressure cylinder A, a low pressure cylinder B, a low pressure cylinder A steam inlet butterfly valve, a low pressure cylinder B steam inlet butterfly valve, a low pressure first-stage steam extraction and a low pressure second-stage steam extraction; the high-pressure cylinder steam exhaust port is connected to a boiler reheater through the reheating cold section, the boiler reheater is connected to the intermediate pressure cylinder steam inlet through the reheating hot section, and the intermediate pressure cylinder steam exhaust port is connected to the A low-pressure cylinder steam inlet and the B low-pressure cylinder steam inlet respectively. The utility model has the advantages that: the utility model discloses respectively install an admission butterfly valve additional in two low pressure jar admission closed pipes departments, pressure transmitter is installed additional at the back to the butterfly valve, and low pressure jar steam pressure is advanced in the monitoring, and when the unit low-load section moves, promotes heat supply extraction pressure through closing down single low pressure jar admission butterfly valve aperture in proper order, can satisfy the required minimum pressure demand of external heat supply user when the unit low-load section moves, and unit operation economic nature is higher.
Description
Technical Field
The utility model relates to a thermal power generation technical field, concretely relates to promote device of heat supply extraction parameter when two low-pressure cylinder steam turbines low-load operation.
Background
With the change of the power consumption structure, the day-night peak-valley difference of the power grid is continuously increased, so that the existing peak regulation capacity cannot meet the trend of peak regulation development of the power grid, and the thermal power generating unit can run under 50% load for a long time.
At present, the uniform-adjustment coal-fired units in Zhejiang province all participate in deep peak adjustment. Large coal-fired units, particularly units of 60 ten thousand grades and above, have become the main force of peak shaving of the power grid, the lowest output has been reduced to 40% of rated load, and part of holidays have deep peak shaving load even reduced to 30% of load.
The heat supply unit in Zhejiang province mainly uses industrial steam extraction heat supply as a main part, and for a 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 may not meet user requirements when low-load operation is carried out, part of units raise heat supply steam extraction pressure through closing a middle-pressure regulating valve, throttling loss is caused when working steam enters an intermediate pressure cylinder, or heat supply is carried out through selecting a higher parameter steam source, such as boiler main steam and screen type superheater punching steam extraction heat supply, and the running economy of the unit is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at when two low pressure jar steam turbine units low-load operation, when reheat cold section or hot section can not satisfy the user demand as the heat supply steam source of drawing steam, promote heat supply pressure of drawing steam through closing little medium-pressure governing valve, or choose for use higher parameter steam heating mode, if boiler main steam, platen superheater punch steam extraction etc. the relatively poor problem of economic nature provides a two low pressure jar steam turbine low-load operation promote the device of heat supply parameter of drawing steam.
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, an intermediate pressure cylinder, a boiler reheater, a low pressure cylinder A, a low pressure cylinder B, a low pressure cylinder A steam inlet butterfly valve, a low pressure cylinder B steam inlet butterfly valve, a low pressure first-stage steam extraction and a low pressure second-stage steam extraction; the high-pressure cylinder steam exhaust port 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 exhaust port is respectively connected to a low-pressure cylinder A and a low-pressure cylinder B; 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 low-pressure cylinder A is provided with a steam inlet butterfly valve of the low-pressure cylinder A, and the rear end of the steam inlet butterfly valve of the low-pressure cylinder A is provided with a rear pressure transmitter of the steam inlet butterfly valve of the low-pressure cylinder A; 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 a low-pressure first-stage steam extraction first branch of the low-pressure cylinder A and a low-pressure first-stage steam extraction second branch of the low-pressure cylinder B are converged and connected to the low-pressure first-stage steam extraction; the low-pressure second-stage steam extraction is provided with two branches, and the low-pressure second-stage steam extraction first branch of the A low-pressure cylinder and the low-pressure second-stage steam extraction second branch of the B low-pressure cylinder are converged and connected to the low-pressure second-stage steam extraction.
Preferably, the method comprises the following steps: two steam inlets of the intermediate pressure cylinder are respectively provided with a first intermediate pressure cylinder steam inlet regulating valve and a second intermediate pressure cylinder steam inlet regulating valve.
Preferably, the method comprises the following steps: 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.
Preferably, the method comprises the following steps: 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 utility model has the advantages that: the utility model discloses respectively install an admission butterfly valve additional in two low pressure jar admission closed pipes departments, pressure transmitter is installed additional at the back to the butterfly valve, and low pressure jar steam pressure is advanced in the monitoring, and when the unit low-load section moves, promotes heat supply extraction pressure through closing down single low pressure jar admission butterfly valve aperture in proper order, can satisfy the required minimum pressure demand of external heat supply user when the unit low-load section moves, and unit operation economic nature is higher.
Drawings
Figure 1 is the utility model discloses the device schematic diagram of two low pressure cylinder steam turbines promote heat supply extraction parameter when low-load operation.
Description of reference numerals: 1-high pressure cylinder; 2-intermediate pressure cylinder; 3, steam extraction and heat supply of the reheating cold section; 4-boiler reheater; 5, steam extraction and heat supply are carried out on the reheating section; 6-reheating cold section steam extraction pressure transmitter; 7-a reheating hot section steam extraction pressure transmitter; 8, a steam inlet adjusting valve of the first intermediate pressure cylinder; 9-a second intermediate pressure cylinder steam inlet adjusting valve; 10-A low pressure cylinder; 11-B low pressure cylinder; 12-A low pressure cylinder steam inlet butterfly valve; 13-B low-pressure cylinder steam inlet butterfly valve; 14-A low pressure cylinder steam inlet butterfly valve back pressure transmitter; 15-B, a pressure transmitter behind a steam inlet butterfly valve of a low-pressure cylinder; 16-low pressure first stage steam extraction check valve; 17-low pressure first stage steam extraction electric isolation valve; 18-low pressure first stage extraction; 19-low pressure second stage steam extraction check valve; 20-low pressure second stage steam extraction electric isolation valve; 21-low-pressure second-stage steam extraction; 22-first branch of low pressure first stage extraction; 23-a second branch of low-pressure first-stage extraction; 24-a first branch of low-pressure second-stage extraction; 25-second branch of low pressure second stage extraction.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Example one
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, an intermediate pressure cylinder 2, a boiler reheater 4, a low pressure cylinder A10, a low pressure cylinder B11, a low pressure cylinder A steam inlet butterfly valve 12, a low pressure cylinder B 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 intermediate-pressure cylinder 2 through a reheating hot section, and the steam outlet of the intermediate-pressure cylinder 2 is respectively connected to the steam inlet of the low-pressure cylinder A10 and the steam inlet of the low-pressure cylinder 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; a steam inlet of the B low-pressure cylinder 11 is provided with a B low-pressure cylinder steam inlet butterfly valve 13, and the rear end of the B low-pressure cylinder steam inlet butterfly valve 13 is provided with a B low-pressure cylinder steam inlet butterfly valve rear pressure transmitter 15; the low-pressure first-stage steam extraction 18 is provided with two branches, 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 manner; the low-pressure second-stage extraction 21 is provided with two branches, a first low-pressure second-stage extraction branch 24 of the low-pressure cylinder A10 and a second low-pressure second-stage extraction branch 25 of the low-pressure cylinder B11 are connected to the low-pressure second-stage extraction 21 in a converging manner.
In a preferred embodiment, two steam inlets of the intermediate pressure cylinder 2 are respectively provided with a first intermediate pressure cylinder steam inlet adjusting valve 8 and a second intermediate pressure cylinder steam inlet adjusting valve 9.
As a preferred embodiment, 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; 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
The utility model discloses a set up A low pressure jar admission butterfly valve 12 and B low pressure jar admission butterfly valve 13 on A low pressure jar 10 and the 11 admission pipelines of B low pressure jar respectively, install pressure transmitter 14 behind the A low pressure jar admission butterfly valve and pressure transmitter 15 behind the B low pressure jar admission butterfly valve respectively additional behind the admission butterfly valve, low pressure jar steam pressure is advanced in the monitoring, when the unit low-load operation, through closing little A low pressure jar admission butterfly valve 12 or B low pressure jar admission butterfly valve 13 in proper order, in order to improve reheat cold section extraction heating pressure or reheat hot section extraction heating pressure.
In the process of closing the steam inlet butterfly valve of the low-pressure cylinder, the blast loss of last stages of blades of the low-pressure cylinder caused by small low-pressure steam inlet flow is avoided, the minimum steam inlet flow of the low-pressure cylinder can be determined by a manufacturer through thermodynamic calculation, and is represented by a low-pressure steam inlet pressure value behind the butterfly valve, and the corresponding opening degree of the butterfly valve is the valve low limit value at the moment; or the low-pressure final-stage exhaust steam temperature is taken as a monitoring target, the alarm value of the exhaust steam temperature of the low-pressure cylinder is taken as a criterion, the exhaust steam temperature corresponding to the minimum opening of the low-pressure cylinder intake butterfly valve does not exceed the alarm value, and the opening of the intake butterfly valve is adjusted on the premise of not exceeding the alarm value.
In the attached figure 1, the low-pressure first-stage extraction steam 18 is provided with two branches which symmetrically extract steam from a low-pressure cylinder A10 and a low-pressure cylinder B11 respectively and are converged into a path to enter a low-pressure first-stage heater; the low pressure second stage extraction 21 is similar in construction to the low pressure first stage extraction 18 and will not be described in further detail.
Have two branches and follow the unit that two low pressure jar symmetries were taken out respectively to a certain one-level extraction steam of low pressure, the utility model discloses closing little first low pressure jar admission butterfly valve in-process, two extraction branches can take place to scurry the vapour phenomenon: the first low pressure cylinder leads to the extraction pressure to drop because of the through-flow partial pressure reduction, and the extraction branch of another low pressure cylinder can get into the extraction branch of first low pressure cylinder thereby gets into first low pressure cylinder, has increased the cooling steam of first low pressure cylinder, can effectively restrain the production of blast loss to can further reduce the aperture of first low pressure cylinder steam admission butterfly valve. More specifically, taking the low-pressure first-stage extraction steam 18 as an example, in the process of closing the steam inlet butterfly valve 12 of the low-pressure cylinder a, the pressure of two low-pressure first-stage extraction steam branches is unbalanced, the pressure of the second low-pressure first-stage extraction steam branch 23 of the low-pressure cylinder B11 is higher than that of the first low-pressure first-stage extraction steam branch 22 of the low-pressure cylinder a 10, and no check valve is arranged on the two steam extraction branch pipes, so that the steam in the pipeline of the second low-pressure first-stage extraction steam branch 23 enters the low-pressure cylinder a 10 through the first low-pressure first-stage extraction steam branch 22, the last steam flow of the low-pressure cylinder a 10 is increased, namely the cooling steam flow of the low-pressure cylinder a 10 is increased, a certain benefit is provided for suppressing the blast loss, and the opening degree of the steam inlet butterfly valve 12 of the low-pressure cylinder a can be further reduced.
Generally, for a double low-pressure cylinder unit, the low-pressure cylinder efficiency refers to the average value of the two low-pressure cylinder efficiencies, and the steam inlet flow of the two low-pressure cylinders is considered to be distributed equally. As is well known, the efficiency curve of the low-pressure cylinder decreases rapidly along with the reduction of the volume flow of the exhausted steam, and the low-pressure cylinder is at a lower efficiency level when the unit operates at a low-load section.
The steam inlet butterfly valves are additionally arranged on the two low-pressure cylinders, on the premise of keeping the load to be certain, 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 increase in efficiency of the second lower pressure cylinder is greater than the decrease in efficiency of the first lower pressure cylinder, the average efficiency of the two lower pressure cylinders is increased. More specifically, on the premise of keeping the load constant, in the process of closing the steam inlet butterfly valve 12 of the low-pressure cylinder a, the steam inlet flow of the two low-pressure cylinders is redistributed, that is, the steam inlet flow of the low-pressure cylinder a 10 is reduced, and the steam inlet flow of the low-pressure cylinder B11 is correspondingly increased. When the steam inlet butterfly valve 12 of the low-pressure cylinder A is closed to a certain opening degree, the efficiency increasing value of the low-pressure cylinder B11 is larger than the efficiency decreasing value of the low-pressure cylinder A10, and the average efficiency value of the two low-pressure cylinders is increased.
The utility model discloses consider that close two low pressure jar steam inlet butterfly valves of little in proper order, promote the cold section of reheating or the hot section of reheating heat supply extraction pressure can satisfy the required minimum pressure demand of external heat supply user when unit low-load section moves.
EXAMPLE III
By taking the improvement of the steam extraction and heat supply pressure of the reheating cold section as an embodiment, the embodiment limits the processes of 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 in sequence, and can meet the lowest pressure requirement required by an external heat supply user when a low-load section of a unit operates after the steam extraction and heat supply pressure of the reheating cold section is improved.
Through the investigation discovery of a plurality of reheating cold section steam extraction heat supply units: when the unit operates at low load, the pressure of the reheating cold section is relatively lower than the minimum required pressure value of a heat supply user, and the deviation is not large. The embodiment can achieve the purpose of increasing the pressure of the low-load reheating cold section to meet the requirement of a heat supply user.
The method comprises the following specific steps:
according to the heat balance diagram or the actual operation data of the unit, the minimum load value P corresponding to the condition that the steam extraction and heat supply pressure of the reheating and cooling section of the unit meets the requirement of a heat supply user is determinede1。
Develop unit low load section Pe1-Pe2Typical load operating point lifting reheating cold section steam extraction heat supply test, wherein Pe2For the current main dispatching unit depth peak regulation load low limit value, P is addede1-Pe2The load segments are equally divided into load points.
Step 1: at the ith load point PiFor example, slowly closing the A low-pressure cylinder steam inlet butterfly valve 12, and recording the unit load, the opening degree of the A low-pressure cylinder steam inlet butterfly valve 12, the opening degree of the B low-pressure cylinder steam inlet butterfly valve 13, the pressure behind the A low-pressure cylinder steam inlet butterfly valve (14 pressure value behind the A low-pressure cylinder steam inlet butterfly valve), the pressure behind the B low-pressure cylinder steam inlet butterfly valve (15 pressure value behind the B low-pressure cylinder steam inlet butterfly valve), the heat supply pressure of the reheat cold-section steam extraction (6 pressure value of the reheat cold-section steam extraction pressure transmitter), and the exhaust steam pressure of the A low-pressure cylinder during closingTemperature and B low-pressure cylinder exhaust temperature.
Step 2: when the A low-pressure cylinder steam inlet butterfly valve 12 is closed, the reheating cold section steam extraction heat supply pressure can be increased, the A low-pressure cylinder steam inlet flow can be reduced, the pressure behind the A low-pressure cylinder steam inlet butterfly valve can be reduced, the A low-pressure cylinder steam exhaust temperature can be increased, and the B low-pressure cylinder steam inlet flow can be increased.
And step 3: and when the reheating cold section steam extraction heat supply pressure meets the lowest pressure requirement of a heat supply user, stopping closing the A low-pressure cylinder steam inlet butterfly valve 12, stopping the test, and recording the related parameter values.
And 4, step 4: when the steam inlet butterfly valve 12 of the low-pressure cylinder A is closed to the minimum opening degree and the reheating cold section steam extraction heat supply pressure still cannot meet the minimum pressure requirement of a heat supply user, the steam inlet butterfly valve 12 of the low-pressure cylinder A is kept at the minimum opening degree, and meanwhile, the steam inlet butterfly valve 13 of the low-pressure cylinder B is closed.
And 5: and when the reheating cold section steam extraction heat supply pressure meets the lowest pressure requirement of a heat supply user, stopping closing the B low-pressure cylinder steam inlet butterfly valve 13, and recording the related parameter values.
Repeating the steps 1 to 5 to obtain Pe1-Pe2And (3) a test method and relevant important parameters for raising the steam extraction and heat supply pressure of the reheating cold section to meet the lowest pressure requirement of a heat supply user at each typical working condition point of the low-load section.
Claims (3)
1. The utility model provides a device that double low pressure cylinder steam turbine low-load operation promoted heat supply extraction parameter which characterized in that: the system comprises a high-pressure cylinder (1), a middle-pressure cylinder (2), a boiler reheater (4), a low-pressure cylinder A (10), a low-pressure cylinder B (11), a low-pressure cylinder A steam inlet butterfly valve (12), a low-pressure cylinder B steam inlet butterfly valve (13), a low-pressure first-stage steam extraction valve (18) and a low-pressure second-stage steam extraction valve (21); the steam exhaust port 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 port of the intermediate-pressure cylinder (2) through a reheating hot section, and the steam exhaust port of the intermediate-pressure cylinder (2) is respectively connected to the steam inlet ports of the A low-pressure cylinder (10) and the B low-pressure cylinder (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 B low-pressure cylinder (11) is provided with a B low-pressure cylinder steam inlet butterfly valve (13), and the rear end of the B low-pressure cylinder steam inlet butterfly valve (13) is provided with a B low-pressure cylinder steam inlet butterfly valve rear pressure transmitter (15); 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 low-pressure cylinder A (10) and a low-pressure first-stage steam extraction second branch (23) of the low-pressure cylinder B (11) are converged and connected to the low-pressure first-stage steam extraction (18); the low-pressure second-stage steam extraction (21) is provided with two branches, and a first branch (24) of the low-pressure second-stage steam extraction of the low-pressure cylinder A (10) and a second branch (25) of the low-pressure second-stage steam extraction of the low-pressure cylinder B (11) are connected to the low-pressure second-stage steam extraction (21) in a converging manner.
2. The apparatus according to claim 1, wherein the apparatus for raising the parameters of the extraction steam for heating during low load operation of the steam turbine with double low pressure cylinders comprises: 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 apparatus according to claim 1, wherein the apparatus for raising the parameters of the extraction steam for heating during low load operation of the steam turbine with double low pressure cylinders comprises: 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107623A (en) * | 2021-05-14 | 2021-07-13 | 浙江浙能技术研究院有限公司 | Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine |
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2021
- 2021-05-14 CN CN202121042031.5U patent/CN214660397U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107623A (en) * | 2021-05-14 | 2021-07-13 | 浙江浙能技术研究院有限公司 | Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine |
| CN113107623B (en) * | 2021-05-14 | 2024-05-28 | 浙江浙能技术研究院有限公司 | Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure cylinder steam turbine |
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