CN109441575B - Method for operating heat supply network system of steam combined cycle generator set in heat supply period - Google Patents
Method for operating heat supply network system of steam combined cycle generator set in heat supply period Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000003921 oil Substances 0.000 claims description 18
- 239000002918 waste heat Substances 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 12
- 238000003303 reheating Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000010687 lubricating oil Substances 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
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- 238000010248 power generation Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 239000003657 drainage water Substances 0.000 description 1
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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
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
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Abstract
The invention relates to a method for operating a heat supply network system of a gas-steam combined cycle generator set in a heat supply period, which fully plays the roles of a high-pressure bypass and a medium-pressure bypass of a steam turbine by controlling high-pressure bypass and medium-pressure bypass valves, desuperheating water and steam parameters, so that high-temperature high-pressure steam bypasses the steam turbine through the bypass, and the 900 MW-level gas-steam combined cycle generator set realizes heat supply to the heat supply network under the working condition of a full-cut steam turbine. The invention solves the problem that the steam turbine of the gas-steam combined cycle unit cannot safely and stably supply heat to a heat supply network in the heat supply period due to the fact that high-temperature high-pressure steam cannot be introduced due to special reasons (the debugging of all systems of the steam turbine is not completed in the capital construction period, the steam turbine system has serious defects and is not suitable for operation and the like), helps operators to safely cut off the steam turbine in the heat supply period, and provides technical support and reference for the safe and stable operation of the heat supply network system in the heat supply period of the gas-steam combined cycle unit.
Description
Technical Field
The invention belongs to the technical field of safe operation of a gas-steam combined cycle unit, and particularly relates to a method for operating a heat supply network system of a steam combined cycle unit in a heat supply period.
Technical Field
Gas-steam combined cycle devices (combined cycle devices for short) can combine the advantages of the two. Its circulation not only has the high heating temp. of gas turbine, but also has the low temp. of heat release of steam power plant, so that it has high heat efficiency, can greatly raise heat efficiency of thermal power plant, can solve the pollution problem, and can promote "clean combustion of coal", so that it is a power generation technology with development prospect.
The heat supply extraction steam of a heating network heater in the heat supply period of a 900MW gas-steam combined cycle unit comes from steam extraction of a steam turbine, and at present, no gas-steam combined cycle unit can supply heat to the heating network under the working condition of full switching of the steam turbine, so that high-temperature and high-pressure steam cannot be introduced into the steam turbine of the gas-steam combined cycle unit due to special reasons (the debugging of all systems of the steam turbine is not completed during capital construction, the steam turbine system has serious defects and is not suitable for running, and the like), but the working condition of safely and stably supplying heat to the heating network is still required to lack necessary technical support.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a method for operating a heat supply network system of a steam combined cycle generator set in the heat supply period, which fully exerts the functions of a high-pressure bypass and a medium-pressure bypass of a steam turbine by controlling parameters of a high-pressure bypass valve, a medium-pressure bypass valve, desuperheating water and steam, enables high-temperature and high-pressure steam to bypass the steam turbine through the bypass, and realizes that a 900 MW-level gas-steam combined cycle unit supplies heat to a heat supply network under the working condition of a full-cut steam turbine.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for operating a heat supply network system of a steam combined cycle generator set in a heat supply period is characterized by comprising the following steps: the method comprises the following steps:
(1) setting and inputting main logic protection of each system of the gas-steam combined cycle unit;
(2) normally putting in a gas-steam combined cycle unit auxiliary system and equipment thereof;
(3) the heat supply network circulating water system is put into operation;
(4) the bypass of the steam turbine is put into operation, and the steam side of the heat supply network heater is put into operation;
(5) and (5) carrying out hydrophobic operation on the heat supply network system.
Furthermore, the setting and investment of main logic protection of each system of the gas-steam combined cycle unit in the step (1) specifically comprises the following steps:
1.1 the liquid level protection of the heating network heater needs to be put into, and the protection value is put into according to the normal operation design;
1.2 liquid level protection (high value and low value) of the hot well needs to be invested, and protection values are invested according to normal operation design;
1.3 the pressure at the inlet of the condensate pump is low to protect normal input;
1.4 the temperature of the body of the condenser drainage flash tank needs to be input, and the temperature reduction water of the condenser drainage flash tank can be adjusted;
1.5 the temperature of the condenser body needs to be input, and the water curtain water spraying of the condenser is adjustable;
1.6 when the electric doors of the steam inlet of the four heating network heaters are completely closed, the waste heat boiler trips, and the interlocking combustion engine trips;
1.7 when the four heat supply network circulating water pumps are completely stopped, the waste heat boiler is tripped, and the interlocking combustion engine is tripped;
1.8 when the four circulating water pumps stop completely, the waste heat boiler trips, and the interlocking combustion engine trips;
1.9, opening an electric door (closing disappearing signal) of the middle side to the condenser, interlocking to open a water curtain temperature reduction water regulating valve by 50 percent, and interlocking to open a low-pressure cylinder water spraying regulating valve by 50 percent;
1.10 the opening of the low-side and middle-side pressure reducing valves is more than 5%, the water curtain temperature reducing water regulating valve is opened in an interlocking way by 50%, and the low-pressure cylinder water spraying regulating valve is opened in an interlocking way by 50%.
Furthermore, the normal input of the auxiliary system of the gas-steam combined cycle unit and the equipment thereof in the step (2) specifically comprises the following steps:
2.1 operating the compressed air system, and confirming that the system pressure is in the range of 0.45-0.8 MPa;
2.2 putting into operation a circulating water system and an open cooling water system;
2.3 putting the closed cooling water system into operation, and confirming that the system pressure is within the range of 0.45-0.6 MPa;
2.4, operating a lubricating oil, sealing oil and jack oil system, confirming that the lubricating oil pressure, the oil temperature, the sealing oil-oil hydrogen differential pressure and the like are normal, and putting equipment for standby;
2.5, turning the vehicle to operate, confirming that the current of the turning vehicle is normal and stable and no abnormal sound exists inside the turning vehicle;
2.6 filling compressed air in the generator, maintaining the pressure in the engine to be 0.05MPa, checking the operation of a sealing oil system, and ensuring that the pressure of the sealing oil is higher than the pressure in the generator to be 0.035 MPa;
2.7, starting the furnace to ignite normally, and putting the auxiliary steam header steam supply system into normal operation;
2.8, putting the waste heat boiler into a condensate system to prepare for starting water feeding of a low-pressure steam drum of the waste heat boiler;
2.9 putting the shaft seal system and the vacuum system in sequence;
2.10 after the condenser vacuum is established, gradually starting drain manual and electric valves on all the steam turbine bodies of the steam turbine;
2.11 main and reheat steam line and low pressure steam line drainage system: after the main and reheating steam pipelines and the low-pressure steam pipeline are pressurized, a manual drain valve and an electric drain valve in front of a pipeline check valve, an electric main gate valve and an adjusting valve are sequentially opened;
2.12, checking whether the stop door and the adjusting door of the high-pressure cylinder exhaust steam to the cold re-inlet are opened, wherein the high-pressure main steam pipeline bypass to the cold re-inlet pipeline has no impact and leakage, and the bypass is manually and automatically put into normal operation;
2.13, checking that the electric valve of the heat supply network steam extraction from the medium-pressure main steam pipeline bypass is opened until the electric valve of the condenser is closed, wherein the pipeline has no impact and no leakage, and the medium-pressure bypass automatically operates normally;
2.14 check low pressure main steam line to auxiliary steam header electric valve close. And opening the steam extraction electric valve of the heat supply network. No impact and no leakage exist when the low-pressure bypass is connected to the bypass pipeline of the condenser, and the low-pressure bypass is closed;
2.15DCS picture checking that the positions of all valves of the high-pressure, medium-pressure and low-pressure bypass systems are correct and the states are normal; the bypass desuperheating water is conducted and has the input condition; the bypass system is put into automatic control.
After the heat supply network circulating water pump in the step (3) is started and the heat supply network circulating water pump is checked to normally operate, the opening of the scoop tube is manually increased, the rotating speed of the heat supply network circulating water pump is checked to increase, and the flow of the heat supply network circulating water is increased; and starting the second heat supply network circulating water pump according to the condition, and adjusting the output balance of the two water pumps after the second heat supply network circulating water pump is merged into the operation, so that the requirement of the heat supply network circulating water flow of a heating power company is met.
Furthermore, the specific operation requirements of the commissioning of the turbine bypass system in the step (4) are as follows:
4.1 the parameters of the bypass system are designed and controlled according to the 10% load of a gas turbine of a gas-steam combined cycle unit #1, 0% load of a gas turbine of a #2 and the full-cut working condition of a #3 turbine;
4.2, reducing pressure and temperature of high-pressure main steam through a No. 1 high-side valve, and then entering a reheating cold section steam system, wherein the pressure of the high-side main steam is controlled to be 0.9MPa, and the temperature is 240-340 ℃ after temperature reduction;
4.3 the reheating hot section steam comes out from the No. 1 middle side valve and then is supplied to the heat network system, the middle side system controls the hot reheating pressure to be 0.5MPa, the temperature after temperature reduction is 220-320 ℃, the middle side is closed to the electric door of the steam turbine condenser, if the steam inlet pressure of the heat network heater is more than 0.56MPa, the middle side is inching to the electric door of the steam turbine condenser, and the steam inlet pressure of the heat network heater is controlled to be less than 0.56 MPa;
4.4 the low-pressure main steam is closed when the system is in operation, the electric door from the low-pressure main steam to the heat supply network is opened, and the low-pressure main steam supplies the heat supply network system.
Furthermore, the steam side of the heat network heater in the step (4) is put into operation, before the combustion engine is ignited, the opening of drain valves of high, medium and low pressure steam systems is checked, the heat network heater adopts a random starting mode, and two groups of heaters are respectively put into operation; igniting a gas turbine, gradually closing each drain valve after each steam pipeline heating pipe is finished, simultaneously adjusting a high-pressure bypass system and a medium-pressure bypass system, and heating a heating network heater and a drain cooler; at the initial stage of the operation of the heat supply network heater, the start-up exhaust is noticed, and after the operation is normal, the operation is switched to the operation exhaust;
in the process of operation, the heat load is adjusted slowly and uniformly, the inlet pressure of the heat supply network heaters is ensured to be less than 0.57MPa, the inlet temperature is 220-320 ℃, the change speed of the outlet temperature of each heat supply network heater is less than or equal to 1-3 ℃/min, and the change of the circulating water temperature of the heat supply network system is less than or equal to 1 ℃/min.
Furthermore, when the operation of the heat supply network drainage system in the step (5) requires that the water level of the heat supply network heater is about 500-600 mm, the recirculation pipeline is conducted, and the heat supply network drainage pump is started in a frequency conversion mode; with the increase of the steam supply, the water level of the heat supply network heater rises, and the drained water is properly opened and discharged to circulating water for thermal state flushing; after the quality of the drainage water of the heat supply network is qualified, the opening of a recirculation pipeline regulating valve and the opening of the heat supply network drainage to a condensate system regulating valve are adjusted to maintain the pressure matching between the drainage of the heat supply network and the outlet of a condensate preposed pump; the standby heat supply network drainage pump is put into standby according to the situation.
The invention has the technical effects that:
the invention fully plays the roles of the high-pressure bypass and the medium-pressure bypass of the steam turbine by controlling the high-pressure bypass and the medium-pressure bypass valves, the temperature-reducing water and the steam parameters, so that high-temperature and high-pressure steam bypasses the steam turbine through the bypass, and the 900 MW-level gas-steam combined cycle unit realizes heat supply to a heat supply network under the working condition of a full-cut steam turbine. The invention solves the problem that the steam turbine of the gas-steam combined cycle unit cannot safely and stably supply heat to a heat supply network in the heat supply period due to the fact that high-temperature high-pressure steam cannot be introduced due to special reasons (the debugging of all systems of the steam turbine is not completed in the capital construction period, the steam turbine system has serious defects and is not suitable for operation and the like), helps operators to safely cut off the steam turbine in the heat supply period, and provides technical support and reference for the safe and stable operation of the heat supply network system in the heat supply period of the gas-steam combined cycle unit.
Drawings
FIG. 1 is a schematic diagram of the system connection of the present invention.
Detailed Description
The present invention will be further illustrated by the following examples and comparative examples, but is not limited to the examples.
The invention discloses a method for operating a heat supply network system under the full-cut working condition of a steam turbine in the heat supply period of a 900 MW-level gas-steam combined cycle unit, which is innovative in that: the method comprises the following specific steps:
(1) setting and inputting main logic protection of each system of the gas-steam combined cycle unit;
(2) normally putting in a gas-steam combined cycle unit auxiliary system and equipment thereof;
(3) the heat supply network circulating water system is put into operation;
(4) the bypass of the steam turbine is put into operation, and the steam side of the heat supply network heater is put into operation;
(5) and (5) carrying out hydrophobic operation on the heat supply network system.
Wherein, the setting and inputting of the main logic protection of each system of the gas-steam combined cycle unit in the step (1) specifically comprises the following steps:
1.1 the liquid level protection of the heating network heater needs to be put into, and the protection value is put into according to the normal operation design;
1.2 liquid level protection (high value and low value) of the hot well needs to be invested, and protection values are invested according to normal operation design;
1.3 the pressure at the inlet of the condensate pump is low to protect normal input;
1.4 the temperature of the body of the condenser drainage flash tank needs to be input, and the temperature reduction water of the condenser drainage flash tank can be adjusted;
1.5 the temperature of the condenser body needs to be input, and the water curtain water spraying of the condenser is adjustable;
1.6 when the electric doors of the steam inlet of the four heating network heaters are completely closed, the waste heat boiler trips, and the interlocking combustion engine trips;
1.7 when the four heat supply network circulating water pumps are completely stopped, the waste heat boiler is tripped, and the interlocking combustion engine is tripped;
1.8 when the four circulating water pumps stop completely, the waste heat boiler trips, and the interlocking combustion engine trips;
1.9, opening an electric door (closing disappearing signal) of the middle side to the condenser, interlocking to open a water curtain temperature reduction water regulating valve by 50 percent, and interlocking to open a low-pressure cylinder water spraying regulating valve by 50 percent;
1.10 the opening of the low-side and middle-side pressure reducing valves is more than 5%, the water curtain temperature reducing water regulating valve is opened in an interlocking way by 50%, and the low-pressure cylinder water spraying regulating valve is opened in an interlocking way by 50%.
Wherein, the normal input of the auxiliary system of the gas-steam combined cycle unit and the equipment thereof in the step (2) specifically comprises the following steps:
2.1 operating the compressed air system, and confirming that the system pressure is in the range of 0.45-0.8 MPa;
2.2 putting into operation a circulating water system and an open cooling water system;
2.3 putting the closed cooling water system into operation, and confirming that the system pressure is within the range of 0.45-0.6 MPa;
2.4, operating a lubricating oil, sealing oil and jack oil system, confirming that the lubricating oil pressure, the oil temperature, the sealing oil-oil hydrogen differential pressure and the like are normal, and putting equipment for standby;
2.5, turning the vehicle to operate, confirming that the current of the turning vehicle is normal and stable and no abnormal sound exists inside the turning vehicle;
2.6 filling compressed air in the generator, maintaining the pressure in the engine to be 0.05MPa, checking the operation of a sealing oil system, and ensuring that the pressure of the sealing oil is higher than the pressure in the generator to be 0.035 MPa;
2.7, starting the furnace to ignite normally, and putting the auxiliary steam header steam supply system into normal operation;
2.8, putting the waste heat boiler into a condensate system to prepare for starting water feeding of a low-pressure steam drum of the waste heat boiler;
2.9 putting the shaft seal system and the vacuum system in sequence;
2.10 after the condenser vacuum is established, the manual and electric drainage valves on all the steam turbine bodies of the steam turbine are gradually opened.
2.11 main and reheat steam line and low pressure steam line drainage system: after the main and reheating steam pipelines and the low-pressure steam pipeline are pressurized, the manual and electric drain valves in front of the pipeline check valve, the electric main gate valve and the electric control valve are opened in sequence.
2.12 checking whether the stop door and the adjusting door of the high-pressure cylinder are opened when the high-pressure cylinder exhausts steam to the cold re-inlet, the high-pressure main steam pipeline is bypassed to the cold re-inlet pipeline without impact and leakage, and the bypass is manually and automatically put into normal operation.
2.13 the inspection medium pressure main steam pipeline bypass is opened to the heat supply network steam extraction electric valve, and is closed to the condenser electric valve, and the pipeline does not have striking, does not have and reveals, and the automatic operation that puts into operation of medium pressure bypass is normal.
2.14 check low pressure main steam line to auxiliary steam header electric valve close. And opening the steam extraction electric valve of the heat supply network. And no impact and no leakage are generated when the low-pressure bypass is closed.
2.15DCS picture checks that the position of each valve of the high-pressure, medium-pressure and low-pressure bypass system is correct and the state is normal. The bypass desuperheating water is conducted and has the input condition. The bypass system is put into automatic control.
After the heat supply network circulating water pump is started in the step (3) and the heat supply network circulating water pump is checked to normally operate, the opening of the scoop tube is manually increased, the rotating speed of the heat supply network circulating water pump is checked to increase, and the flow of the heat supply network circulating water is increased. And starting the second heat supply network circulating water pump according to the condition, and adjusting the output balance of the two water pumps after the second heat supply network circulating water pump is merged into the operation, so that the requirement of the heat supply network circulating water flow of a heating power company is met.
Wherein, the specific operation requirements of the turbine bypass system in the step (4) are as follows:
4.1 the parameters of the bypass system are designed and controlled according to the 10% load of a gas turbine of a gas-steam combined cycle unit #1, 0% load of a gas turbine of a #2 and the full-cut working condition of a #3 turbine;
4.2, reducing pressure and temperature of high-pressure main steam through a No. 1 high-side valve, and then entering a reheating cold section steam system, wherein the pressure of the high-side main steam is controlled to be 0.9MPa, and the temperature is 240-340 ℃ after temperature reduction;
4.3 the reheating hot section steam comes out from the No. 1 middle side valve and then is supplied to the heat network system, the middle side system controls the hot reheating pressure to be 0.5MPa, the temperature after temperature reduction is 220-320 ℃, the middle side is closed to the electric door of the steam turbine condenser, if the steam inlet pressure of the heat network heater is more than 0.56MPa, the middle side is inching to the electric door of the steam turbine condenser, and the steam inlet pressure of the heat network heater is controlled to be less than 0.56 MPa;
4.4 the low-pressure main steam is closed when the system is in operation, the electric door from the low-pressure main steam to the heat supply network is opened, and the low-pressure main steam supplies the heat supply network system.
Wherein, the operation of the steam side of the heat supply network heater in the step (4) is to check the opening of drain valves of high, medium and low pressure steam systems before the ignition of the combustion engine, and the heat supply network heater adopts a random starting mode (two groups of heaters are respectively operated one by one). And (4) igniting the gas turbine, gradually closing each drain valve after each steam pipeline heating pipe is finished, and simultaneously adjusting the high-pressure bypass system and the medium-pressure bypass system to warm the heat supply network heater and the drain cooler. And at the initial stage of the operation of the heat supply network heater, the start-up exhaust is noticed, and after the operation is normal, the operation is switched to the operation exhaust.
In the process of operation, the heat load is adjusted slowly and uniformly, the inlet pressure of the heat supply network heaters is ensured to be less than 0.57MPa, the inlet temperature is 220-320 ℃, the change speed of the outlet temperature of each heat supply network heater is less than or equal to 1-3 ℃/min, and the change of the circulating water temperature of the heat supply network system is less than or equal to 1 ℃/min.
And (4) when the operation of the heat supply network drainage system in the step (5) requires that the water level of the heat supply network heater is about 500-600 mm, the recirculation pipeline is conducted, and the heat supply network drainage pump is started in a frequency conversion mode. Along with the increase of the steam supply, the water level of the heat supply network heater rises, and the drainage is properly opened and discharged to circulating water for thermal state flushing. After the quality of the drained water of the heat supply network is qualified, the pressure matching of the drained water of the heat supply network and the outlet pressure of the condensate preposed pump is maintained by adjusting the opening of a recirculation pipeline adjusting valve and the opening of the heat supply network draining to condensate system adjusting valve. The standby heat supply network drainage pump is put into standby according to the situation.
The invention has the advantages and positive effects that:
the invention fully plays the roles of the high-pressure bypass and the medium-pressure bypass of the steam turbine by controlling the high-pressure bypass and the medium-pressure bypass valves, the temperature-reducing water and the steam parameters, so that high-temperature and high-pressure steam bypasses the steam turbine through the bypass, and the 900 MW-level gas-steam combined cycle unit realizes heat supply to a heat supply network under the working condition of a full-cut steam turbine. The invention solves the problem that the steam turbine of the gas-steam combined cycle unit cannot safely and stably supply heat to a heat supply network in the heat supply period due to the fact that high-temperature high-pressure steam cannot be introduced due to special reasons (the debugging of all systems of the steam turbine is not completed in the capital construction period, the steam turbine system has serious defects and is not suitable for operation and the like), helps operators to safely cut off the steam turbine in the heat supply period, and provides technical support and reference for the safe and stable operation of the heat supply network system in the heat supply period of the gas-steam combined cycle unit.
Claims (2)
1. A method for operating a heat supply network system of a steam combined cycle generator set in a heat supply period is characterized by comprising the following steps: the method comprises the following steps:
(1) setting and inputting main logic protection of each system of the gas-steam combined cycle unit;
the method comprises the following steps:
1.1 the liquid level protection of the heating network heater needs to be put into, and the protection value is put into according to the normal operation design;
1.2 liquid level protection of the hot well needs to be put into, and the protection value is put into according to normal operation design;
1.3 the pressure at the inlet of the condensate pump is low to protect normal input;
1.4 the temperature of the body of the condenser drainage flash tank needs to be input, and the temperature reduction water of the condenser drainage flash tank can be adjusted;
1.5 the temperature of the condenser body needs to be input, and the water curtain water spraying of the condenser is adjustable;
1.6 when the electric doors of the steam inlet of the four heating network heaters are completely closed, the waste heat boiler trips, and the interlocking combustion engine trips;
1.7 when the four heat supply network circulating water pumps are completely stopped, the waste heat boiler is tripped, and the interlocking combustion engine is tripped;
1.8 when the four circulating water pumps stop completely, the waste heat boiler trips, and the interlocking combustion engine trips;
1.9, opening an electric door of the middle side to the condenser, interlocking to open a water curtain temperature reduction water regulating valve by 50 percent, and interlocking to open a low-pressure cylinder water spraying regulating valve by 50 percent;
1.10, the opening degree of the low-side and middle-side pressure reducing valves is more than 5 percent, 50 percent of the water curtain temperature reducing water regulating valve is opened in an interlocking way, and 50 percent of the low-pressure cylinder water spraying regulating valve is opened in an interlocking way;
(2) normally putting in a gas-steam combined cycle unit auxiliary system and equipment thereof;
the method comprises the following steps:
2.1 operating the compressed air system, and confirming that the system pressure is in the range of 0.45-0.8 MPa;
2.2 putting into operation a circulating water system and an open cooling water system;
2.3 putting the closed cooling water system into operation, and confirming that the system pressure is within the range of 0.45-0.6 MPa;
2.4, operating a lubricating oil, sealing oil and jack-up oil system, confirming that the lubricating oil pressure, the oil temperature and the sealing oil hydrogen differential pressure are normal, and putting equipment for standby;
2.5, turning the vehicle to operate, confirming that the current of the turning vehicle is normal and stable and no abnormal sound exists inside the turning vehicle;
2.6 filling compressed air in the generator, maintaining the pressure in the engine to be 0.05MPa, checking the operation of a sealing oil system, and ensuring that the pressure of the sealing oil is higher than the pressure in the generator to be 0.035 MPa;
2.7, starting the furnace to ignite normally, and putting the auxiliary steam header steam supply system into normal operation;
2.8, putting the waste heat boiler into a condensate system to prepare for starting water feeding of a low-pressure steam drum of the waste heat boiler;
2.9 putting the shaft seal system and the vacuum system in sequence;
2.10 after the condenser vacuum is established, gradually starting drain manual and electric valves on all the steam turbine bodies of the steam turbine;
2.11 main and reheat steam line and low pressure steam line drainage system: after the main and reheating steam pipelines and the low-pressure steam pipeline are pressurized, a manual drain valve and an electric drain valve in front of a pipeline check valve, an electric main gate valve and an adjusting valve are sequentially opened;
2.12, checking whether the stop door and the adjusting door of the high-pressure cylinder exhaust steam to the cold re-inlet are opened, wherein the high-pressure main steam pipeline bypass to the cold re-inlet pipeline has no impact and leakage, and the bypass is manually and automatically put into normal operation;
2.13, checking that the electric valve of the heat supply network steam extraction from the medium-pressure main steam pipeline bypass is opened until the electric valve of the condenser is closed, wherein the pipeline has no impact and no leakage, and the medium-pressure bypass automatically operates normally;
2.14, checking that an electric valve from a low-pressure main steam pipeline to an auxiliary steam header is closed, and a steam extraction electric valve from a heat supply network is opened, so that no impact and no leakage exist in a bypass pipeline of the condenser, and a low-pressure bypass is closed;
2.15DCS picture checking that the positions of all valves of the high-pressure, medium-pressure and low-pressure bypass systems are correct and the states are normal; the bypass desuperheating water is conducted and has the input condition; the bypass system is put into automatic control;
(3) the heat supply network circulating water system is put into operation;
the specific implementation method of the step is as follows: after the heat supply network circulating water pump is started and the heat supply network circulating water pump is checked to normally operate, the opening degree of a scoop tube of the heat supply network circulating water pump is manually increased, the rotating speed of the heat supply network circulating water pump is checked to increase, and the flow rate of the heat supply network circulating water is increased;
(4) the bypass of the steam turbine is put into operation, and the steam side of the heat supply network heater is put into operation;
the concrete implementation method of the steam turbine bypass system in the step comprises the following steps:
4.1 the parameters of the bypass system are designed and controlled according to the 10% load of a gas turbine of a gas-steam combined cycle unit #1, 0% load of a gas turbine of a #2 and the full-cut working condition of a #3 turbine;
4.2, reducing pressure and temperature of high-pressure main steam through a No. 1 high-side valve, and then entering a reheating cold section steam system, wherein the pressure of the high-side main steam is controlled to be 0.9MPa, and the temperature is 240-340 ℃ after temperature reduction;
4.3 the reheating hot section steam comes out from the No. 1 middle side valve and then is supplied to the heat network system, the middle side system controls the hot reheating pressure to be 0.5MPa, the temperature after temperature reduction is 220-320 ℃, the middle side is closed to the electric door of the steam turbine condenser, if the steam inlet pressure of the heat network heater is more than 0.56MPa, the middle side is inching to the electric door of the steam turbine condenser, and the steam inlet pressure of the heat network heater is controlled to be less than 0.56 MPa;
4.4, closing the low-pressure side system in operation, opening the electric door from the low-pressure main steam to the heat supply network, and opening the heat supply network system from the low-pressure main steam;
(5) draining and commissioning the heat supply network system;
the specific implementation method of the step is as follows: when the operation of the heat supply network drainage system requires that the water level of a heat supply network heater is 500-600 mm, the recirculation pipeline is conducted, and the heat supply network drainage pump is started in a variable frequency mode; with the increase of the steam supply, the water level of the heat supply network heater rises, and the drained water is properly opened and discharged to circulating water for thermal state flushing; after the quality of the drained water of the heat supply network is qualified, the pressure matching of the drained water of the heat supply network and the outlet pressure of the condensate preposed pump is maintained by adjusting the opening of a recirculation pipeline adjusting valve and the opening of the heat supply network draining to condensate system adjusting valve.
2. The method of claim 1 for operation of a heat supply network system during a heating period of a steam combined cycle power generation unit, comprising: the steam side of the heat network heater in the step (4) is put into operation, before the combustion engine is ignited, the opening of drain valves of high, medium and low pressure steam systems is checked, the heat network heater adopts a random starting mode, and two groups of heaters are respectively put into one; igniting a gas turbine, gradually closing each drain valve after each steam pipeline heating pipe is finished, simultaneously adjusting a high-pressure bypass system and a medium-pressure bypass system, and heating a heating network heater and a drain cooler; at the initial stage of the operation of the heat supply network heater, the start-up exhaust is noticed, and after the operation is normal, the operation is switched to the operation exhaust;
in the process of operation, the heat load is adjusted slowly and uniformly, the inlet pressure of the heat supply network heaters is ensured to be less than 0.57MPa, the inlet temperature is 220-320 ℃, the change speed of the outlet temperature of each heat supply network heater is less than or equal to 1-3 ℃/min, and the change of the circulating water temperature of the heat supply network system is less than or equal to 1 ℃/min.
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| CN110043335B (en) * | 2019-04-30 | 2023-09-01 | 北京国能龙威发电技术有限公司 | Annular multistage temperature and pressure reducing device matched with turbine bypass system |
| CN111895488B (en) * | 2019-05-06 | 2022-10-21 | 河北大唐国际张家口热电有限责任公司 | Steam inlet regulating valve applied to heat supply network system and control method |
| CN110159360B (en) * | 2019-06-11 | 2023-12-26 | 中国电力工程顾问集团西北电力设计院有限公司 | Shaft seal steam supply system and method for gas-steam combined cycle power plant |
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| CN112664817B (en) * | 2020-12-17 | 2022-11-18 | 浙江英集动力科技有限公司 | Active drainage system based on steam pipe network model |
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| CN113882919B (en) * | 2021-08-17 | 2023-09-22 | 大唐七台河发电有限责任公司 | Heat supply system of cogeneration unit and heat-preserving treatment method |
| CN113756898B (en) * | 2021-09-06 | 2023-12-15 | 贵州电网有限责任公司 | Steam turbine constant-speed standby operation method for shutdown of thermal power plant |
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Address after: No. 8, Haitai Huake 4th Road, Huayuan Industrial Zone, High tech Zone, Binhai New Area, Tianjin, 300384 Patentee after: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF STATE GRID TIANJIN ELECTRIC POWER Co. Patentee after: STATE GRID TIANJIN ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: No.8, Haitai Huake 4th Road, Xiqing District, Tianjin 300384 Patentee before: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF STATE GRID TIANJIN ELECTRIC POWER Co. Patentee before: STATE GRID TIANJIN ELECTRIC POWER Co. Patentee before: STATE GRID CORPORATION OF CHINA |