CN115075897B - Combined starting system and method for high and medium pressure cylinders of steam turbine - Google Patents
Combined starting system and method for high and medium pressure cylinders of steam turbine Download PDFInfo
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- CN115075897B CN115075897B CN202210695502.5A CN202210695502A CN115075897B CN 115075897 B CN115075897 B CN 115075897B CN 202210695502 A CN202210695502 A CN 202210695502A CN 115075897 B CN115075897 B CN 115075897B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 80
- 238000011010 flushing procedure Methods 0.000 claims abstract description 42
- 238000007514 turning Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 72
- 238000000605 extraction Methods 0.000 claims description 49
- 238000009423 ventilation Methods 0.000 claims description 46
- 238000001816 cooling Methods 0.000 claims description 43
- 238000002955 isolation Methods 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 230000000630 rising effect Effects 0.000 claims description 10
- 238000004080 punching Methods 0.000 claims description 6
- 239000008236 heating water Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 8
- 230000004992 fission Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000008400 supply water Substances 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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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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
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a system and a method for starting a high-medium pressure cylinder of a steam turbine in a combined way, which adopt a mode of starting the high-medium pressure cylinder in a combined way, improve the temperature of a hearth before the ignition of a boiler, and are beneficial to the initial ignition and burnout rate of the boiler; the cold start realizes the warm-up of the high-pressure cylinder in the turning stage, and the high-pressure rotor is converted from the cold start to the warm start through the brittle fission temperature of the rotor at a low rotating speed; when the machine is started in a cold state and is in a flushing state, the speed of rotation is controlled by the reheat steam of a high-flow low-parameter adjacent machine, the steam inlet of a high-pressure cylinder is normal and warm, the metal temperature of the high-pressure cylinder and the medium-pressure cylinder is stably increased to ensure the starting safety, and the machine set is converted into a hot state for starting after full speed, so that the machine set can be rapidly loaded; when the hot state starts to be washed, before the quality of the main steam is qualified, the speed is increased by the reheat steam of the high-flow low-parameter neighbor machine, and 2900r/min is switched to the combined control of the high-pressure speed regulating valve and the medium-pressure speed regulating valve after the quality of the main steam is qualified. Thereby improving the flexibility peak regulation capability of the unit, shortening the starting time, reducing the cost, reducing the pollution and meeting the starting requirement.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a combined starting system and method for a high-medium pressure cylinder of a steam turbine.
Background
In recent years, with the rapid development of new energy sources such as wind power, photovoltaic and the like, the power grid peak shaving demands and the peak shaving difficulty are further increased, the utilization hours of the thermal power unit are obviously reduced, the unit shutdown standby time is prolonged, and increasingly heavy peak shaving tasks are born. The quick and safe start-stop of the unit becomes an important means for controlling the cost and improving the benefit of power generation enterprises.
The design of the high-low pressure bypass unit with the capacity of 300MW and above is generally a medium-pressure cylinder starting mode, and the design of the high-low pressure bypass unit with the capacity of 300MW and above is generally a high-medium-pressure cylinder combined starting mode. When the two starting modes are in the process of flushing, the medium-pressure rotor is driven by low-parameter and high-flow reheat steam to control the speed rise; main steam enters a high-pressure cylinder to be warmed, enters a condenser through a high-pressure cylinder drain valve (namely a VV valve) and a high-pressure cylinder drain valve, and is subjected to high-pressure cylinder and medium-pressure cylinder switching under a certain load after the units are arranged side by side. The two starting modes can ensure that the metal temperature of the high pressure cylinder and the medium pressure cylinder rises steadily, and quick and safe starting is realized.
Because a part of active turbine sets which are not provided with high and low pressure bypass systems exist in China, the following problems exist in the systems:
1. When the engine is started, only a high-pressure cylinder starting mode can be adopted, the main steam flow is low during the flushing, the metal temperature of the high-pressure cylinder and the medium-pressure cylinder rises slowly, the low-load warming-up time is long after the units are parallel, and the cold starting time is more than 8 hours from the flushing to the parameter rating; when the hot state is started, the main steam can be washed until the quality of the main steam is qualified, so that the starting time is prolonged;
2. The reheat steam temperature rises slowly in the starting process;
3. The adjacent machine heating system is not designed, and the starting time of the boiler is prolonged;
4. The high pressure cylinder back-heating system is not designed, and the high pressure rotor needs to pass the brittle fission temperature of the rotor at high rotation speed.
Disclosure of Invention
In order to solve the technical problems, the invention relates to a combined starting system and a method for a high-medium pressure cylinder of a steam turbine, and the technical scheme is as follows:
The system consists of two steam turbine units, and comprises a local system and a neighboring system, wherein neighboring cold re-steam of the neighboring system is connected with a local cold re-pipeline of the local system through a neighboring cold re-connection electric door;
the system comprises a local high-pressure cylinder, a local medium-pressure cylinder, a superheater, a reheater, a high-discharge check valve, a high-discharge ventilation valve, a local No. 2 high-pressure heater and a condenser; the steam inlet of the high-pressure cylinder of the machine is connected with the steam outlet of the superheater, the steam outlet of the high-pressure cylinder of the machine is divided into two paths of steam outlets, one path of steam outlet is directly connected with the condenser, the other path of steam outlet is connected with the steam inlet of the reheater through the high-discharge check valve, and the steam outlet of the reheater is connected with the steam inlet of the medium-pressure cylinder of the machine;
The machine system is connected with a high-row check valve rear cooling re-pipeline of a neighbor machine system through a machine cooling re-extraction electric door, a machine cooling re-extraction regulating door, a machine cooling re-extraction manual isolation door, a neighbor machine cooling re-connection electric door, a neighbor machine cooling re-extraction manual isolation door, a neighbor machine cooling re-extraction regulating door and a neighbor machine cooling re-extraction electric door;
Punching holes on a front steam extraction pipeline of a steam inlet electric door of a No. 2 high-pressure heater of the machine, respectively adding a high-pressure cylinder inverted heating steam supply pipeline, installing an inverted heating adjusting door and an inverted heating electric door, and connecting an inlet with a front cold re-connection pipeline of a cold re-steam extraction manual isolation door;
Punching holes on a cold re-steam communication pipeline behind a cold re-steam extraction manual isolation door of the machine, respectively adding adjacent machine heating pipelines, installing adjacent machine heating electric doors, check doors and manual isolation doors, and connecting an outlet with a pipeline behind a steam inlet check door of a No.2 high-pressure heater of the machine.
Further, when the high-row ventilation valve applied by the system is arranged in the pipeline in front of the high-row check valve, the high-row ventilation valve is connected with the condenser on the steam exhaust pipeline of the local high-pressure cylinder.
Further, when the high-row ventilation valve applied to the system is arranged on the high-pressure cylinder steam inlet pipe, the high-row ventilation valve is connected with the condenser on the steam inlet pipe of the high-pressure cylinder, and an isolation door is connected in parallel between the steam inlet pipe of the high-row ventilation valve and the steam exhaust pipe of the high-pressure cylinder.
Further, each component of the local system is identical to each component of the neighboring system, and the connection relationship is identical.
A starting method of a combined starting system of a high-medium pressure cylinder of a steam turbine comprises the following steps: before the ignition of the local boiler, after a heating pipe of a neighboring machine cooling and steam supplying pipeline, opening a neighboring machine cooling and steam extracting electric door, a neighboring machine cooling and steam extracting regulating door, a neighboring machine cooling and steam extracting manual isolation door, a neighboring machine cooling and connecting electric door, a neighboring machine heating electric door, a check door and an isolation door, continuously heating water to 190 ℃ by a local No. 2 high-pressure heater, and discharging the water of the local No. 2 high-pressure heater into a condenser through a critical water drain pipeline;
Step 2, in the cold state starting turning stage of the machine, the adjacent machine cold re-steam enters a high-pressure cylinder through a cold re-steam extraction manual isolation door, an inverse heating electric door and an inverse heating adjusting door of the machine to be inverse heated, enters a condenser through a high-pressure cylinder drain door, and is stewed after the high-pressure cylinder is heated to 180 ℃, and the inverse heating electric door, the inverse heating adjusting door and the high-pressure cylinder drain door are closed;
step 3, the machine is started to perform flushing rotation in a cold state: after the gate is hung, the high-pressure speed regulating valve, the medium-pressure main valve and the high-row ventilation valve are opened, and the high-pressure main valve and the medium-pressure speed regulating valve are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater, and the flushing and the rising speed are controlled to 600r/min by a medium pressure speed regulating valve; when the speed is continuously increased, the upper steam turbine unit is controlled by a high-pressure main valve pre-opening valve to perform high-pressure cylinder normal heating, and exhaust steam enters the condenser through a high-exhaust ventilation valve; after medium-speed and high-speed warm-up is carried out, continuously increasing the speed to 2900r/min, switching the control of the high-pressure main valve pre-opening valve into the control of the high-pressure speed regulating valve, and then continuously increasing the speed to 3000r/min; the east steam and the steam turbine set are controlled by a high-pressure speed-regulating valve to perform the normal heating of a local high-pressure cylinder, and after the engine is warmed up at medium speed and high speed, the engine is continuously accelerated to 3000r/min; after the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine;
Step 4, the machine is started to perform flushing in a hot state: before the quality of the main steam is unqualified, after the main steam is hung, a medium-pressure main valve and a high-row ventilation valve are opened, and a high-pressure main valve and a high-pressure speed regulation valve are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater, and the flushing and the rising speed are controlled to 2900r/min by a medium pressure speed regulating valve; after the quality of the main steam is qualified, a high-pressure main valve and a high-pressure speed regulating valve are opened, and the main steam is controlled by the high-pressure speed regulating valve and the medium-pressure speed regulating valve to continuously rise to 3000r/min; the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine.
The beneficial effects of the invention are as follows: the invention relates to a high-medium pressure cylinder combined starting system and a method for a steam turbine, wherein the system combines a local system and an adjacent system to improve the thermodynamic system and the starting method of two adjacent steam turbine sets, and adopts a high-medium pressure cylinder combined starting mode, so that the temperature of a hearth can be increased before the ignition of a boiler, the initial ignition and burnout rate of the boiler are facilitated, and the starting time of the boiler is shortened; the cold start realizes the warm-down of the high-pressure cylinder in the turning stage, so that the high-pressure rotor passes through the brittle fission temperature of the rotor at a low rotating speed and is converted from cold start to warm start; when the machine is started to perform the flushing and turning in a cold state, the speed is controlled by the reheat steam of a high-flow low-parameter adjacent machine, the steam inlet of a high-pressure cylinder is positive and warm, the metal temperature of the high-pressure cylinder and the medium-pressure cylinder is steadily increased to ensure the starting safety, the machine set is converted into a hot state to be started after full speed, the load can be quickly carried, and the low-load long-time warming can be avoided; when the hot state starts to be washed, before the quality of the main steam is qualified, the speed is increased by the reheat steam of the high-flow low-parameter neighbor machine, and 2900r/min is switched to the combined control of the high-pressure speed regulating valve and the medium-pressure speed regulating valve after the quality of the main steam is qualified. Therefore, the flexibility peak regulation capacity of the unit is improved, the starting time is shortened, the starting cost is reduced, the pollutant emission is reduced, and the power grid flexibility starting requirement is met.
Drawings
FIG. 1 is a system diagram of a high-discharge vent valve (VV valve) disposed before a high-discharge check valve;
FIG. 2 is a diagram of a high-pressure cylinder intake conduit system with a high-exhaust vent valve (VV valve);
As shown in the figure: a 1 superheater I, a 2 high-pressure main valve I, a 3 high-pressure speed regulating valve I, a 4-machine high-pressure cylinder, a 5-high-discharge check valve I, a 6 reheater I, a 7-medium-pressure main valve I, an 8-medium-pressure speed regulating valve I, a 9-machine medium-pressure cylinder, a 10 superheater II, a 11-high-pressure main valve II, a 12-high-pressure speed regulating valve II, a 13-machine high-pressure cylinder, a 14-high-discharge check valve II, a 15 reheater II, a 16-medium-pressure main valve II, a 17-medium-pressure speed regulating valve II, a 18-machine medium-pressure cylinder, a 19-machine cold re-extraction electric door, a 20-machine-cold re-extraction regulating door, a 21-machine-cold re-extraction manual isolation door, a 22-machine-cold re-connection electric door, a 23-machine heating electric door, a 24-check valve I, a 25-isolation door I, a 26-machine No.2 high-pressure heater, a 27-machine-cold re-extraction manual isolation door, a 28-back-heating electric door II, a 29-back-heating electric door II,30 high-pressure cylinder drain doors I,31 condensers I,32 local cold re-extraction regulating doors, 33 local cold re-extraction electric doors, 34 high-row ventilation valves I,35 isolation doors V,36 isolation doors III,37 local heating electric doors, 38 check doors II,39 isolation doors II,40 adjacent machine No.2 high-pressure heaters, 41 inverted heating electric doors I,42 inverted heating regulating doors I,43 high-pressure cylinder drain doors II,44 condensers II,45 isolation doors IV,46 isolation doors VI,47 high-row ventilation valves II,48 adjacent machine No.2 high-pressure heater inlet electric doors, 49 adjacent machine No.2 high-pressure heater inlet check doors, 50 local machine No.2 high-pressure heater inlet electric doors, 51 local machine No.2 high-pressure heater inlet check doors, 52 local cold re-extraction pipeline drain doors, 53 adjacent machine cold re-extraction pipeline drain doors.
Detailed Description
As shown in the figure, the invention relates to a combined starting system and a method for a high-medium pressure cylinder of a steam turbine, wherein the system consists of two steam turbine units, and comprises a local system and an adjacent system, wherein adjacent cold re-steam of the adjacent system is connected with a local cold re-pipeline of the local system through an adjacent cold re-connection electric door 22, and the electric door is opened and closed according to requirements. The system is respectively applied to a steam turbine with a high-row ventilation valve arranged in front of a high-row check valve and a high-row ventilation valve arranged in a high-pressure cylinder steam inlet guide pipe, and each part of the system and the connection relation of each part are the same as those of each part of a neighboring system.
As shown in fig. 1, in embodiment 1, the high-row vent valve I is disposed in front of the high-row check valve, which means in front of the high-row check valve of the own system and in front of the high-row check valve of the neighboring system. In the local system, a pipeline in front of a local high-pressure cylinder 4 and a high-row check valve I5 is connected with a high-row ventilation valve I34 (i.e. a VV valve) and a condenser I31 through a tee joint, and an isolation door V35 is also arranged in front of the high-row ventilation valve I. In the adjacent machine system, an adjacent machine high-pressure cylinder 13 and a pipeline in front of a high-row check valve II14 are connected with a condenser II44 through a tee joint and a high-row ventilation valve II47, and an isolation door VI46 is arranged in front of the high-row ventilation valve II.
As shown in fig. 2, in embodiment 2, the high-row ventilation valve II is disposed in the high-pressure cylinder steam inlet pipe, which means the high-pressure cylinder steam inlet pipe of the local system and the high-pressure cylinder steam inlet pipe of the neighboring system. In the system, an inlet pipeline of a high-pressure cylinder 4 of the system is connected with a high-row ventilation valve I34 and a condenser I31 through a tee joint, an isolation door V35 is further arranged in front of the high-row ventilation valve I, and an isolation door III36 is connected in parallel between an inlet pipeline of the high-pressure ventilation valve II34 and an outlet pipeline of the high-pressure cylinder. In the adjacent system, an inlet pipeline of the adjacent high-pressure cylinder 13 is connected with a condenser II44 through a tee joint and a high-row ventilation valve II47, an isolation door VI46 is further arranged in front of the high-row ventilation valve II, and an isolation door IV45 is connected in parallel between the inlet pipeline of the high-pressure ventilation valve II and an outlet pipeline of the local high-pressure cylinder.
The components common to example 1 and example 2 and their connection relationships are as follows:
1. local system
The local system comprises a local high-pressure cylinder 4, a local medium-pressure cylinder 9, a superheater I1, a reheater I6, a high-row check valve I5, a high-row ventilation valve I34, a local No. 2 high-pressure heater 26 and a condenser I31; the main steam at the outlet of the superheater I1 enters a local high-pressure cylinder 4 to do work through a high-pressure main valve I2 and a high-pressure speed regulating valve I3. The exhaust steam of the high-pressure cylinder 4 of the machine is divided into two paths, one path enters a reheater I6 after passing through a high-exhaust check valve I5, and reheated steam at the outlet of the reheater I6 enters the medium-pressure cylinder 9 of the machine to do work through a medium-pressure main valve I7 and a medium-pressure speed regulation valve I8; the other path is connected with a condenser I31 through a high-pressure cylinder drain door I30. The high-pressure cylinder inverted heating steam supply pipeline is arranged in front of the high-discharge check valve I5, an inverted heating adjusting door II29 and an inverted heating electric door II28 are arranged on the pipeline, and the steam outlet pipeline of the high-discharge check valve I is sequentially connected with the cold re-extraction electric door 33 and the cold re-extraction adjusting door 32 through a tee joint. The pipeline of the cold re-extraction regulating door 32 of the machine is converged with the steam inlet pipeline of the reverse heating electric door II28, and is connected with the pipeline of the adjacent cold re-connection electric door 22 through the cold re-extraction manual isolating door 27 of the machine. The steam outlet pipeline of the back heating regulating door II29 is sequentially connected with the steam inlet electric door 50 of the No. 2 high-pressure heater of the machine and the steam inlet check door 51 of the No. 2 high-pressure heater of the machine through a tee joint, and the No. 2 high-pressure heater of the machine 26 of the machine. The adjacent machine cold re-steam from the adjacent machine is divided into two paths through the pipeline of the adjacent machine cold re-connecting electric door, and the adjacent machine cold re-steam is connected with the local machine cold re-connecting pipeline through the adjacent machine cold re-connecting electric door. One path enters the local high-pressure cylinder to perform turning, inverse heating and middle-pressure cylinder flushing, and the other path is connected with the local No. 2 high-pressure heater 26 through the adjacent heating electric door 23, the check door I24 and the isolation door I25 (namely an adjacent heating pipeline) in sequence, and enters the steam side of the local No. 2 high-pressure heater to heat and supply water. The cold re-extraction pipeline drain door 52 of the machine is used for a cold re-extraction pipeline drain heating pipe during operation.
2. Neighbor system
The adjacent machine system comprises an adjacent machine high-pressure cylinder 13, an adjacent machine medium-pressure cylinder 18, a superheater II10, a reheater II15, a high-row check valve II14, a high-row ventilation valve II47, an adjacent machine No. 2 high-pressure heater 40 and a condenser II44; the main steam at the outlet of the superheater II10 enters the adjacent high-pressure cylinder 13 to do work through the high-pressure main valve II11 and the high-pressure speed regulating valve II 12. The exhaust steam of the adjacent machine high pressure cylinder 13 is divided into two paths, one path enters a reheater II15 after passing through a high-exhaust check valve II14, and reheated steam at the outlet of the reheater II15 enters an adjacent machine medium pressure cylinder 18 to do work through a medium-pressure main valve II16 and a medium-pressure speed regulation valve II 17; the other path is connected with a condenser II44 through a high-pressure cylinder drain door II 43. The high-pressure cylinder inverted heating steam supply pipeline is arranged in front of the high-discharge check valve II14, an inverted heating adjusting door I42 and an inverted heating electric door I41 are arranged on the pipeline to be connected, and the steam outlet pipeline of the high-discharge check valve II14 is sequentially connected with the adjacent machine cooling re-extraction electric door 19 and the adjacent machine cooling re-extraction adjusting door 20 through a tee joint. The pipeline of the adjacent machine cold re-extraction steam regulating door 20 is converged with the steam inlet pipeline of the inverted-heating electric door I41, and is connected with the pipeline of the adjacent machine cold re-connection electric door 22 through the adjacent machine cold re-extraction steam manual isolation door 21. The steam outlet pipeline of the inverted heating adjusting gate I42 is connected with the steam inlet electric gate 48 of the adjacent machine No. 2 high-pressure heater and the steam inlet check gate 49 of the adjacent machine No. 2 high-pressure heater in sequence through a tee joint, and the adjacent machine No. 2 high-pressure heater 40. The local cold re-steam from the local is divided into two paths through the pipeline of the adjacent cold re-connecting electric door 22, one path enters the adjacent high-pressure cylinder to perform turning, inverse heating and medium-pressure cylinder flushing, and the other path is connected with the adjacent No. 2 high-pressure heater 26 through the local heating electric door 37, the check door II38 and the isolation door II39 (namely, the local heating pipeline) in sequence. The adjacent machine cold re-extraction pipeline drain door 53 is used for the cold re-extraction pipeline drain heating pipe when in operation.
The system starting method comprises the following steps:
Before the ignition of the local boiler, after a heating pipe of a neighboring machine cooling and steam supplying pipeline, opening a neighboring machine cooling and steam extracting electric door, a neighboring machine cooling and steam extracting regulating door, a neighboring machine cooling and steam extracting manual isolation door, a neighboring machine cooling and connecting electric door, a neighboring machine heating electric door, a check door and an isolation door, continuously heating water to 190 ℃ by a local No.2 high-pressure heater, and discharging the water of the local No.2 high-pressure heater into a condenser through a critical water drain pipeline; the furnace temperature is improved, the initial ignition and burnout rate of the boiler are facilitated, and the starting time of the boiler is shortened;
Step 2, in the cold state starting turning stage of the machine, the adjacent machine cold re-steam enters a high-pressure cylinder through a cold re-steam extraction manual isolation door, an inverse heating electric door and an inverse heating adjusting door of the machine to be inverse heated, enters a condenser through a high-pressure cylinder drain door, and is stewed after the high-pressure cylinder is heated to 180 ℃, and the inverse heating electric door, the inverse heating adjusting door and the high-pressure cylinder drain door are closed;
step 3, the machine is started to perform flushing rotation in a cold state: after the gate is hung, the high-pressure speed regulating valve, the medium-pressure main valve and the high-row ventilation valve are opened, and the high-pressure main valve and the medium-pressure speed regulating valve are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater, and the flushing and the rising speed are controlled to 600r/min by a medium pressure speed regulating valve; when the speed is continuously increased, the upper steam turbine unit is controlled by a high-pressure main valve pre-opening valve to perform high-pressure cylinder normal heating, and exhaust steam enters the condenser through a high-exhaust ventilation valve; after medium-speed and high-speed warm-up is carried out, continuously increasing the speed to 2900r/min, switching the control of the high-pressure main valve pre-opening valve into the control of the high-pressure speed regulating valve, and then continuously increasing the speed to 3000r/min; the east steam and the steam turbine set are controlled by a high-pressure speed-regulating valve to perform the normal heating of a local high-pressure cylinder, and after the engine is warmed up at medium speed and high speed, the engine is continuously accelerated to 3000r/min; after the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine;
Step 4, the machine is started to perform flushing in a hot state: before the quality of the main steam is unqualified, after the main steam is hung, a medium-pressure main valve and a high-row ventilation valve are opened, and a high-pressure main valve and a high-pressure speed regulation valve are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater, and the flushing and the rising speed are controlled to 2900r/min by a medium pressure speed regulating valve; after the quality of the main steam is qualified, a high-pressure main valve and a high-pressure speed regulating valve are opened, and the main steam is controlled by the high-pressure speed regulating valve and the medium-pressure speed regulating valve to continuously rise to 3000r/min; the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine.
The specific working procedure is as follows:
1. In embodiment 1, the system flow before the high-row vent valve (i.e., VV valve) is provided at the high-row check valve is as follows:
1. The normal operation flow of the unit is as follows:
in normal operation, valves 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47 are closed.
Main steam at the outlet of the superheater I1 of the boiler of the machine enters a high-pressure cylinder 4 to do work through a high-pressure main valve I2 and a high-pressure speed regulating valve I3, and high-pressure cylinder exhaust steam enters a reheater I6 through a high-pressure check valve I5 to heat and then enters a medium-pressure cylinder 9 to do work through a medium-pressure main valve I7 and a medium-pressure speed regulating valve I8.
Main steam at the outlet of the adjacent boiler superheater II10 enters the adjacent high-pressure cylinder 13 to do work through the high-pressure main valve II11 and the high-pressure speed regulation valve II12, and exhaust steam of the adjacent high-pressure cylinder enters the reheater II15 through the high-exhaust check valve II14 to heat, and then enters the adjacent medium-pressure cylinder 18 to do work through the medium-pressure main valve II16 and the medium-pressure speed regulation valve II 17.
2. The machine is stopped, the adjacent machine operates, and the machine flow is started:
(1) The adjacent machine heating process comprises the following steps: before the boiler is ignited, valves 19, 20, 21, 22, 23, 24 and 25 are sequentially opened, adjacent machine cold steam enters a No. 2 high-pressure heater 26 of the boiler, the water supply temperature is heated to 190 ℃, and the water supply is boosted by a water supply pump and then reaches the boiler.
(2) The high-pressure cylinder of the machine is subjected to a warm-up flow: in the turning stage of the steam turbine, a drain valve I30 of the high-pressure cylinder of the steam turbine is opened, valves 27 and 28 are opened, the opening of a back-heating adjusting valve II29 is adjusted, the steam inlet quantity of the high-pressure cylinder is controlled, and the back-heating of the high-pressure cylinder of the steam turbine is carried out. The high pressure cylinder metal temperature reached 180 c and the valves 28, 29, 30 were closed.
(3) Cold state starting flushing, normal heating and cylinder cutting processes:
1) And (3) feeding a steam turbine set: the valves 32 and 33 are opened, the parameters of the main steam and the reheat steam reach the flushing condition, the steam turbine is hung up, and the machine is started to flush in a cold state: after the gate is hung, the high-pressure speed regulating valve I3, the medium-pressure main valve I7 and the high-row ventilation valve I34 are opened, and the high-pressure main valve I2 and the medium-pressure speed regulating valve I8 are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater I6, and the flushing and the rising speed are controlled to 600r/min by a medium pressure speed regulating valve I8; when the speed is continuously increased, the upper steam turbine unit is controlled by a high-pressure main valve pre-opening valve to perform high-pressure cylinder normal heating, and exhaust steam enters the condenser through a high-exhaust ventilation valve; after medium-speed and high-speed warm-up is carried out, the speed is continuously increased to 2900r/min, the control of the high-pressure main valve pre-opening valve is switched to the control of the high-pressure speed regulating valve, and then the speed is continuously increased to 3000r/min.
2) East steam and hash steam machine set: in the process of flushing, the high-pressure cylinder is controlled by the high-pressure speed-regulating valve I3 to be warmed up, and after medium-speed and high-speed warming up is carried out, the speed is continuously increased to 3000r/min.
1) And 2) after the two units are parallel, carrying 5% -10% of initial load, gradually closing the adjacent machine cooling and re-connecting electric door 22, and automatically controlling the system to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine; the high-pressure speed regulating valve I3 is opened, the cold re-extraction regulating valve 32 of the machine is gradually closed until the cold re-extraction regulating valve is completely closed, the high-row check valve I5 is opened, the high-row ventilation valve I34 is closed, and the valves 33, 27, 23, 24, 25, 22, 21, 20 and 19 are closed.
(4) Hot start punching, turning and cutting cylinder of machine
Before the quality of the main steam is unqualified, a medium-pressure main valve I7 and a high-row ventilation valve I34 are opened after a gate is hung, and a high-pressure main valve I2 and a high-pressure speed regulation valve I3 are closed; during the flushing, the cool re-steam of the adjacent machine enters the local medium pressure cylinder 9 after being heated by the reheater I6, and the flushing and the rising speed are controlled to 2900r/min by the medium pressure speed regulating valve I8; after the quality of the main steam is qualified, a high-pressure main valve I2 and a high-pressure speed regulating valve I3 are opened, and the high-pressure speed regulating valve I3 and a medium-pressure speed regulating valve I8 are used for controlling the main steam to continuously rise to 3000r/min; the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door 22 is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine. The high-pressure speed regulating valve I3 is opened, the local cold re-extraction regulating valve 32 is gradually closed until the cold re-extraction regulating valve is completely closed, the high-row check valve I5 is opened, the VV valve 34 is closed, and the valves 33, 27, 23, 24, 25, 22, 21, 20 and 19 are closed.
2. In example 2, the high-pressure cylinder intake conduit system flow in which the high-pressure vent valve (i.e., VV valve) is provided is as follows:
1. The normal operation flow of the unit is as follows:
In normal operation, valves 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47 are closed.
Main steam at the outlet of the superheater I1 of the boiler of the machine enters a high-pressure cylinder 4 to do work through a high-pressure main valve I2 and a high-pressure speed regulating valve I3, and high-pressure cylinder exhaust steam enters a reheater I6 through a high-pressure check valve I5 to heat and then enters a medium-pressure cylinder 9 to do work through a medium-pressure main valve I7 and a medium-pressure speed regulating valve I8.
Main steam at the outlet of the adjacent boiler superheater II10 enters the adjacent high-pressure cylinder 13 to do work through the high-pressure main valve II11 and the high-pressure speed regulation valve II12, and exhaust steam of the adjacent high-pressure cylinder enters the reheater II15 through the high-exhaust check valve II14 to heat, and then enters the adjacent medium-pressure cylinder 18 to do work through the medium-pressure main valve II16 and the medium-pressure speed regulation valve II 17.
2. The machine is stopped, the adjacent machine operates, and the machine flow is started:
(1) The adjacent machine heating process comprises the following steps: before the boiler is ignited, valves 19, 20, 21, 22, 23, 24 and 25 are sequentially opened, adjacent machine cold steam enters a No. 2 high-pressure heater 26 of the boiler, the water supply temperature is heated to 190 ℃, and the water supply is boosted by a water supply pump and then reaches the boiler.
(2) The high-pressure cylinder of the machine is subjected to a warm-up flow: in the turning stage of the steam turbine, a drain valve I30 of the high-pressure cylinder of the steam turbine is opened, valves 27 and 28 are opened, the opening of a back-heating adjusting valve II29 is adjusted, the steam inlet quantity of the high-pressure cylinder is controlled, and the back-heating of the high-pressure cylinder of the steam turbine is carried out. The metal temperature of the high-pressure cylinder of the machine reaches 180 ℃, and the valves 28, 29 and 30 are closed.
(3) Cold state starting flushing, normal heating and cylinder cutting processes:
1) And (3) feeding a steam turbine set: the valves 32, 33 and 36 are opened, the parameters of the main steam and the reheat steam reach the flushing condition, the steam turbine is hung up, and the machine is started to flush in a cold state: after the gate is hung, the high-pressure speed regulating valve I3, the medium-pressure main valve I7 and the high-row ventilation valve I34 are opened, and the high-pressure main valve I2 and the medium-pressure speed regulating valve I8 are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater I6, and the flushing and the rising speed are controlled to 600r/min by a medium pressure speed regulating valve I8; when the speed is continuously increased, the upper steam turbine unit is controlled by a high-pressure main valve pre-opening valve to perform high-pressure cylinder normal heating, and exhaust steam enters the condenser through a high-exhaust ventilation valve; after medium-speed and high-speed warm-up is carried out, the speed is continuously increased to 2900r/min, the control of the high-pressure main valve pre-opening valve is switched to the control of the high-pressure speed regulating valve, and then the speed is continuously increased to 3000r/min.
2) East steam and hash steam machine set: in the process of flushing, the high-pressure cylinder is controlled by the high-pressure speed-regulating valve I3 to be warmed up, and after medium-speed and high-speed warming up is carried out, the speed is continuously increased to 3000r/min.
1) And 2) after the two units are parallel, carrying 5% -10% of initial load, gradually closing the adjacent machine cooling and re-connecting electric door 22, and automatically controlling the system to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine; the high-pressure speed regulating valve I3 is opened, the local cold re-extraction regulating valve 32 is gradually closed until the cold re-extraction regulating valve is completely closed, the high-row check valve I5 is opened, the high-row ventilation valve I34 is closed, and the valves 33, 36, 27, 23, 24, 25, 22, 21, 20 and 19 are closed.
(4) Hot start punching, turning and cutting cylinder of machine
Before the quality of the main steam is unqualified, a medium-pressure main valve I7 and a high-row ventilation valve I34 are opened after a gate is hung, and a high-pressure main valve I2 and a high-pressure speed regulation valve I3 are closed; during the flushing, the cool re-steam of the adjacent machine enters the local medium pressure cylinder 9 after being heated by the reheater I6, and the flushing and the rising speed are controlled to 2900r/min by the medium pressure speed regulating valve I8; the quality of the main steam is qualified, a high-pressure main valve I2 and a high-pressure speed regulating valve I3 are opened, and the high-pressure speed regulating valve I3 and a medium-pressure speed regulating valve I8 are used for controlling the main steam to continuously rise to 3000r/min; the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door 22 is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine. The high-pressure speed regulating valve I3 is opened, the local cold re-extraction regulating valve 32 is gradually closed until the cold re-extraction regulating valve is completely closed, the high-row check valve I5 is opened, the VV valve 34 is closed, and the valves 33, 36, 27, 23, 24, 25, 22, 21, 20 and 19 are closed.
According to the invention, a starting mode of the steam turbine without the high-pressure bypass and the low-pressure bypass is converted from the starting of the high-pressure cylinder to the combined starting of the high-pressure cylinder and the medium-pressure cylinder, and after the cold re-pipeline connection of two adjacent units, the requirements of heating water supply by adjacent machine steam during the starting of the boiler and controlling the speed rise by entering the adjacent machine cold re-steam into the medium-pressure cylinder during the turning stage of the high-pressure cylinder are simultaneously met. The system is provided with a related electric isolation door, a check door, a manual isolation door and the like, and can meet the starting requirement of any one of two adjacent units. The metal temperature and expansion of the high and medium pressure cylinders in the process of flushing and rotating can be uniformly increased, starting safety is guaranteed, starting time can be shortened, starting cost is reduced, and the requirements of the unit for adapting to power grid flexibility peak regulation starting are met. The device comprises a high-pressure cylinder, a medium-pressure cylinder, a superheater, a reheater and the like of a local machine and an adjacent machine, main steam at an outlet of the superheater enters the high-pressure cylinder to do work through a high-pressure main valve and a speed regulation valve, exhaust steam of the high-pressure cylinder enters the reheater after passing through a high-pressure exhaust check valve, and steam at an outlet of the reheater enters the medium-pressure cylinder to do work through the medium-pressure main valve and the medium-pressure speed regulation valve. Part of cold re-steam of the machine and the adjacent machine is connected through a pipeline and a valve: cold re-steam from the adjacent machine enters the steam side of a No. 2 high-pressure heater of the machine through a connecting electric door, and water is discharged and enters a condenser through a critical water discharge door, so that the water supply temperature is heated to 190 ℃ during starting; one path of steam enters a front cold part of a high-row check valve and flows into a high-pressure cylinder in a reverse way through a pipeline, the high-pressure cylinder is drained and enters a condenser for reverse heating of the high-pressure cylinder in a turning stage, and the metal temperature of the high-pressure cylinder is heated to 180 ℃; the other path of steam enters a reheater of the machine to be heated and used as a medium pressure cylinder flushing steam source. When in flushing, the air enters a local medium pressure cylinder after being cooled by an adjacent machine and heated by steam, and the speed is increased to 3000r/min by a medium pressure speed regulating valve; the machine is characterized in that a main valve pre-opening valve (2900 r/min is switched to high-pressure speed regulation valve control) or main steam flow entering a high-pressure cylinder is controlled by the high-pressure speed regulation valve to perform high-pressure cylinder positive heating, and exhaust steam enters a condenser through a VV valve; after the parallel units are arranged, the high and medium pressure cylinders are switched under 5% load.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (1)
1. A combined starting system of a high-medium pressure cylinder of a steam turbine is characterized by comprising two steam turbine units, wherein the two steam turbine units comprise a local system and a neighboring system, and neighboring cold re-steam of the neighboring system is connected with a local cold re-pipeline of the local system through a neighboring cold re-connection electric door;
the system comprises a local high-pressure cylinder, a local medium-pressure cylinder, a superheater, a reheater, a high-discharge check valve, a high-discharge ventilation valve, a local No. 2 high-pressure heater and a condenser; the steam inlet of the high-pressure cylinder of the machine is connected with the steam outlet of the superheater, the steam outlet of the high-pressure cylinder of the machine is divided into two paths of steam outlets, one path of steam outlet is directly connected with the condenser, the other path of steam outlet is connected with the steam inlet of the reheater through the high-discharge check valve, and the steam outlet of the reheater is connected with the steam inlet of the medium-pressure cylinder of the machine;
The machine system is connected with a high-row check valve rear cooling re-pipeline of a neighbor machine system through a machine cooling re-extraction electric door, a machine cooling re-extraction regulating door, a machine cooling re-extraction manual isolation door, a neighbor machine cooling re-connection electric door, a neighbor machine cooling re-extraction manual isolation door, a neighbor machine cooling re-extraction regulating door and a neighbor machine cooling re-extraction electric door;
Punching holes on a front steam extraction pipeline of a steam inlet electric door of a No. 2 high-pressure heater of the machine, respectively adding a high-pressure cylinder inverted heating steam supply pipeline, installing an inverted heating adjusting door and an inverted heating electric door, and connecting an inlet with a front cold re-connection pipeline of a cold re-steam extraction manual isolation door;
Punching holes on a cold re-steam communication pipeline behind a cold re-steam extraction manual isolation door of the machine, respectively adding adjacent machine heating pipelines, installing adjacent machine heating electric doors, check doors and manual isolation doors, and connecting an outlet with a pipeline behind a steam inlet check door of a No.2 high-pressure heater of the machine;
When the high-row ventilation valve applied by the system is arranged in the front pipeline of the high-row check valve, the high-row ventilation valve is connected with the condenser on the steam exhaust pipeline of the local high-pressure cylinder;
When the high-row ventilation valve applied by the system is arranged on the steam inlet conduit of the high-pressure cylinder, the steam inlet conduit of the high-pressure cylinder of the system is connected with the condenser through the high-row ventilation valve, and an isolation door is connected in parallel between the steam inlet pipeline of the high-row ventilation valve and the steam outlet pipeline of the high-pressure cylinder of the system;
Each component of the local system is the same as each component of the adjacent system, and the connection relations are the same;
the starting method of the system comprises the following steps:
Before the ignition of the local boiler, after a heating pipe of a neighboring machine cooling and steam supplying pipeline, opening a neighboring machine cooling and steam extracting electric door, a neighboring machine cooling and steam extracting regulating door, a neighboring machine cooling and steam extracting manual isolation door, a neighboring machine cooling and connecting electric door, a neighboring machine heating electric door, a check door and an isolation door, continuously heating water to 190 ℃ by a local No. 2 high-pressure heater, and discharging the water of the local No. 2 high-pressure heater into a condenser through a critical water drain pipeline;
Step 2, in the cold state starting turning stage of the machine, the adjacent machine cold re-steam enters a high-pressure cylinder through a cold re-steam extraction manual isolation door, an inverse heating electric door and an inverse heating adjusting door of the machine to be inverse heated, enters a condenser through a high-pressure cylinder drain door, and is stewed after the high-pressure cylinder is heated to 180 ℃, and the inverse heating electric door, the inverse heating adjusting door and the high-pressure cylinder drain door are closed;
step 3, the machine is started to perform flushing rotation in a cold state: after the gate is hung, the high-pressure speed regulating valve, the medium-pressure main valve and the high-row ventilation valve are opened, and the high-pressure main valve and the medium-pressure speed regulating valve are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater, and the flushing and the rising speed are controlled to 600r/min by a medium pressure speed regulating valve; when the speed is continuously increased, the upper steam turbine unit is controlled by a high-pressure main valve pre-opening valve to perform high-pressure cylinder normal heating, and exhaust steam enters the condenser through a high-exhaust ventilation valve; after medium-speed and high-speed warm-up is carried out, continuously increasing the speed to 2900r/min, switching the control of the high-pressure main valve pre-opening valve into the control of the high-pressure speed regulating valve, and then continuously increasing the speed to 3000r/min; the east steam and the steam turbine set are controlled by a high-pressure speed-regulating valve to perform the normal heating of a local high-pressure cylinder, and after the engine is warmed up at medium speed and high speed, the engine is continuously accelerated to 3000r/min; after the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine;
Step 4, the machine is started to perform flushing in a hot state: before the quality of the main steam is unqualified, after the main steam is hung, a medium-pressure main valve and a high-row ventilation valve are opened, and a high-pressure main valve and a high-pressure speed regulation valve are closed; during the flushing, the adjacent machine cold re-steam enters a local medium pressure cylinder after being heated by a reheater, and the flushing and the rising speed are controlled to 2900r/min by a medium pressure speed regulating valve; after the quality of the main steam is qualified, a high-pressure main valve and a high-pressure speed regulating valve are opened, and the main steam is controlled by the high-pressure speed regulating valve and the medium-pressure speed regulating valve to continuously rise to 3000r/min; the parallel units are provided with 5-10% of initial load, the adjacent machine cooling and re-connecting electric door is gradually closed, and the system automatically controls to switch the combined starting mode of the high-pressure cylinder and the medium-pressure cylinder of the machine to the starting mode of the high-pressure cylinder of the machine.
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| JPH11159305A (en) * | 1997-11-25 | 1999-06-15 | Hitachi Ltd | Pressurized fluidized bed combined generating plant |
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