CN115405427B - Decoupling operation method of 9FA single-shaft combined cycle unit - Google Patents
Decoupling operation method of 9FA single-shaft combined cycle unit Download PDFInfo
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- CN115405427B CN115405427B CN202210824511.XA CN202210824511A CN115405427B CN 115405427 B CN115405427 B CN 115405427B CN 202210824511 A CN202210824511 A CN 202210824511A CN 115405427 B CN115405427 B CN 115405427B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 172
- 239000002918 waste heat Substances 0.000 claims abstract description 30
- 239000000779 smoke Substances 0.000 claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 16
- 239000007769 metal material Substances 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 8
- 239000003345 natural gas Substances 0.000 claims description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- PJVWKTKQMONHTI-UHFFFAOYSA-N warfarin Chemical compound OC=1C2=CC=CC=C2OC(=O)C=1C(CC(=O)C)C1=CC=CC=C1 PJVWKTKQMONHTI-UHFFFAOYSA-N 0.000 claims 1
- 229960005080 warfarin Drugs 0.000 claims 1
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- 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
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
-
- 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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the technical field of gas-steam combined cycle units, in particular to a decoupling operation method of a 9FA single-shaft combined cycle unit. According to the decoupling operation method of the 9FA single-shaft combined cycle unit, a new starting smoke exhaust temperature curve of the 9FA gas turbine with the DLN2.0+ combustion chamber is obtained through modeling calculation, so that the smoke exhaust temperature of the 9FA gas turbine with the DLN2.0+ combustion chamber is optimized when the 9FA gas turbine with the DLN2.0+ combustion chamber is started, the 9FA gas turbine with the DLN2.0+ combustion chamber is independently loaded, the combined cycle temperature matching is carried out on the specified gas turbine load, and the waste heat boiler is guaranteed not to be overtemperature during the temperature matching.
Description
Technical Field
The invention relates to a 9FA single-shaft combined cycle unit, in particular to a decoupling operation method of the 9FA single-shaft combined cycle unit.
Background
Currently, a 9FA single-shaft combined cycle unit with a DLN2.0+ combustor is originally designed by General Electric (GE) company of a original manufacturer. When a 9FA single-shaft combined cycle unit with a DLN2.0+ combustion chamber is started, a 9FA gas turbine is started by ignition first, and exhaust gas enters a waste heat boiler, and then the steam turbine is not powered. When the 9FA gas turbine lifts the load to about 50 MW-60 MW, the exhaust temperature is kept unchanged at the load, the waste heat boiler and the steam turbine are waited for preheating, temperature matching is carried out until the steam turbine completely enters the steam turbine, a sliding pressure operation mode is entered, and temperature matching is completed; at this time, the 9FA single-shaft combined cycle unit enters a gas turbine and steam turbine combined cycle operation mode. Then, the 9FA gas turbine can further lift the load, and the load of the steam turbine is lifted along with the lifting of the load of the gas turbine. If the 9FA gas turbine of the 9FA single-shaft combined cycle unit provided with the DLN2.0+ combustion chamber singly increases the load to be more than 60MW, the exhaust gas temperature of the 9FA gas turbine exceeds the allowable temperature of the metal materials of the waste heat boiler, so that the operation risk is caused, and the operation of the power plant is forbidden. According to the traditional starting operation process of the original manufacturer, the operation of the 9FA single-shaft combined cycle unit with the DLN2.0+ combustion chamber is required to be continuously lifted after the temperature matching of the 9FA gas turbine is completed when the load of the 9FA gas turbine reaches 50 MW-60 MW, and the 9FA gas turbine cannot be separated from the steam turbine to independently lift the load. At present, no operation method for independently lifting load of a gas turbine exists in the market for a 9FA single-shaft combined cycle unit with a DLN2.0+ combustion chamber.
Disclosure of Invention
The invention aims to solve the defects and provides a decoupling operation method of a gas turbine and a steam turbine of a 9FA single-shaft combined cycle unit.
In order to overcome the defects in the background art, the technical scheme adopted by the invention for solving the technical problems is as follows: the method for decoupling and operating the 9FA single-shaft combined cycle unit gas turbine and the steam turbine is based on a Hua Rui blue maxCHD control system, and comprises the following steps:
Firstly, when a 9FA single-shaft combined cycle unit provided with a DLN2.0+ combustion chamber is started, a gas turbine is firstly ignited and started, smoke discharged by the gas turbine enters a waste heat boiler, and a steam bypass system of the steam turbine is started;
Secondly, the gas turbine is subjected to full-speed no-load lifting, natural gas fuel heating is waited, and when the natural gas fuel temperature reaches 150-185 ℃, the gas turbine continues load lifting;
Thirdly, the exhaust gas temperature of the gas turbine increases along with the increase of the load, in order to prevent the exhaust gas temperature of the gas turbine from exceeding the allowable temperature of the metal material of the waste heat boiler, the exhaust gas temperature Tx of the gas turbine is set according to the allowable temperature 565-600 ℃ of the metal material of the waste heat boiler, and a new exhaust gas temperature control curve is calculated and built according to the exhaust gas temperature Tx of the gas turbine;
when the gas turbine exhaust gas temperature rises and reaches Tx, the gas turbine exhaust gas control curve is switched from the conventional exhaust gas control curve to an exhaust gas control curve with the exhaust gas temperature of Tx, and when the gas turbine load continues to rise, the gas turbine exhaust gas temperature is kept unchanged at Tx;
fourthly, when the load of the gas turbine reaches a designated load MW, the load MW of the gas turbine is required to be the designated load with the exhaust gas temperature higher than 371.1 ℃, the gas turbine keeps the load MW and the exhaust gas temperature Tx unchanged, the preheating of the waste heat boiler and the steam turbine is waited, the temperature matching is started, at the moment, the flow of steam generated by the waste heat boiler entering the steam turbine cylinder is gradually increased until the steam turbine cylinder is completely fed into the steam turbine cylinder, the steam turbine enters a sliding pressure operation mode, a steam bypass system of the steam turbine is closed, the temperature matching is completed, after the temperature matching is completed, the 9FA single-shaft combined cycle unit enters a combined cycle operation mode of the gas turbine and the steam turbine, and the load of the steam turbine can be increased along with the lifting of the load of the gas turbine;
Fifthly, switching the smoke exhaust temperature control curve of the gas turbine to a conventional smoke exhaust control curve;
And sixthly, continuously loading the 9FA single-shaft combined cycle unit to full load.
According to another embodiment of the invention, further comprising the step of said fourth step of the gas turbine reaching a specified load MW with a flue gas temperature higher than 371.1 ℃ and keeping the flue gas temperature Tx unchanged, under which conditions temperature matching is performed.
The beneficial effects of the invention are as follows: according to the method for decoupling operation of the 9FA single-shaft combined cycle unit gas turbine steam turbine, the 9FA single-shaft combined cycle unit gas turbine can be independently loaded by optimizing and modifying the smoke exhaust temperature curve of the gas turbine, and the temperature of the waste heat boiler and the temperature of the steam turbine are matched at the expected gas turbine load. The decoupling operation of the 9FA single-shaft combined cycle unit gas turbine and the steam turbine is realized.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. Embodiments of the invention are described herein in terms of various specific embodiments, including those that are apparent to those of ordinary skill in the art and all that come within the scope of the invention.
When the 9FA gas turbine is started by using a traditional starting curve, in order to avoid over-temperature of the exhaust-heat boiler and the steam turbine, the load of the gas turbine needs to wait for temperature matching of the exhaust-heat boiler and the steam turbine at 50 MW-60 MW. The 9FA single-shaft combined cycle unit gas turbine and steam turbine decoupling operation method is based on the Hua-boria-blue maxCHD control system, and the 9FA single-shaft combined cycle unit gas turbine can be independently loaded by optimizing and modifying the smoke exhaust temperature curve of the gas turbine, temperature matching is carried out on specified gas turbine loads, and meanwhile the smoke exhaust temperature of the gas turbine is ensured to be in a temperature range allowed by waste heat boiler metal, so that the 9FA single-shaft combined cycle unit gas turbine and steam turbine decoupling operation is realized.
The specific method comprises the following steps:
Firstly, when a 9FA single-shaft combined cycle unit provided with a DLN2.0+ combustion chamber is started, a gas turbine is firstly ignited and started, smoke discharged by the gas turbine enters a waste heat boiler, and a steam bypass system of the steam turbine is started;
Secondly, the gas turbine is subjected to full-speed no-load lifting, the natural gas fuel is heated and warmed by the hot water from the outlet of the medium-pressure economizer of the waste heat boiler or the heat source of the electric heater, and when the natural gas fuel temperature reaches 150-185 ℃, the gas turbine continues to lift the load;
Thirdly, increasing the exhaust gas temperature of the gas turbine along with the increase of the load, wherein the maximum exhaust gas temperature of the gas turbine can reach 648.9 ℃, setting the exhaust gas temperature Tx of the gas turbine according to the allowable temperature 565-600 ℃ of the metal material of the waste heat boiler in order to avoid that the exhaust gas temperature of the gas turbine exceeds the allowable temperature of the metal material of the waste heat boiler, and calculating and establishing a new exhaust gas temperature control curve according to the exhaust gas temperature Tx of the gas turbine;
when the gas turbine exhaust gas temperature rises and reaches Tx, the gas turbine exhaust gas control curve is switched from the conventional exhaust gas control curve to an exhaust gas control curve with the exhaust gas temperature of Tx, and when the gas turbine load continues to rise, the gas turbine exhaust gas temperature is kept unchanged at Tx;
Fourthly, when the load of the gas turbine reaches a specified load MW, the load MW of the gas turbine is required to be the specified load with the exhaust temperature higher than 371.1 ℃, the gas turbine keeps the load MW and the exhaust temperature Tx unchanged, the preheating of the waste heat boiler and the steam turbine is waited for, the temperature matching is started, at the moment, the flow of steam generated by the waste heat boiler entering the steam turbine cylinder is gradually increased until the steam turbine cylinder completely enters the steam, the steam turbine enters a sliding pressure operation mode, a steam bypass system of the steam turbine is closed, and the temperature matching is completed; after the temperature matching is completed, the 9FA single-shaft combined cycle unit enters a gas turbine and steam turbine combined cycle operation mode, and the load of a steam turbine can be increased along with the load increase of the gas turbine;
Fifthly, switching the smoke exhaust temperature control curve of the gas turbine to a conventional smoke exhaust control curve;
And sixthly, continuously loading the 9FA single-shaft combined cycle unit to full load.
In the fourth step, the gas turbine reaches a specified load MW with the exhaust gas temperature higher than 371.1 ℃ and keeps the set exhaust gas temperature Tx unchanged, and temperature matching is carried out under the condition.
When a gas turbine of the 9FA single-shaft combined cycle unit provided with the DLN2.0+ combustion chamber is operated by using a new smoke discharging control curve with the smoke discharging temperature of Tx, the condition that the metal materials are not over-heated during the preheating of the waste heat boiler is ensured, and the operation is safe.
The method for calculating the reference combustion temperature of the gas turbine refers to the following papers:
WILLIAM I. ROWEN "Operating Characteristics of Heavy-Duty Gas Turbines in Utility Service",ASME 88-GT-150, June 1988;
WILLIAM I. ROWEN "Simplified Mathematical Representations of Single Shaft Gas Turbines in Mechanical Drive Service",ASME 92-GT-22,June 1992;
What pure white, jiang Hongde et al, "method for estimating reference temperature for combustion in gas turbine", gas turbine technology, volume 27, 4 th, month 2014, 12.
Example 1
Firstly, when a 9FA single-shaft combined cycle unit provided with a DLN2.0+ combustion chamber is started, a gas turbine is firstly ignited and started, smoke discharged by the gas turbine enters a waste heat boiler, and a steam bypass system of the steam turbine is started;
secondly, the gas turbine is subjected to full-speed no-load lifting, the gas turbine waits for heating natural gas fuel from hot water at an outlet of a medium-pressure economizer in the waste heat boiler, and when the temperature of the natural gas fuel reaches 160 ℃, the gas turbine continues to lift the load;
And thirdly, increasing the exhaust gas temperature of the gas turbine along with the increase of the load, wherein the maximum exhaust gas temperature of the gas turbine can reach 648.9 ℃. In order to avoid that the exhaust gas temperature of the gas turbine exceeds the allowable temperature of the metal material of the waste heat boiler by 600 ℃, setting the exhaust gas temperature of the gas turbine to 593.3 ℃ according to the allowable temperature of the metal material of the waste heat boiler, and calculating and establishing a new exhaust gas temperature control curve according to the exhaust gas temperature of the gas turbine to 593.3 ℃;
when the exhaust gas temperature of the gas turbine is increased and reaches 593.3 ℃, the exhaust gas control curve of the gas turbine is switched from the conventional exhaust gas control curve of 648.9 ℃ to the exhaust gas control curve of which the exhaust gas temperature is 593.3 ℃, and when the load of the gas turbine is continuously increased, the exhaust gas temperature of the gas turbine is kept unchanged at 593.3 ℃;
Fourthly, when the load of the gas turbine reaches the specified load 180MW, the gas turbine keeps the load 180MW and the exhaust temperature 593.3 ℃ unchanged, the preheating of the waste heat boiler and the steam turbine is waited, the temperature matching is started, at the moment, the flow of steam generated by the waste heat boiler entering the steam turbine cylinder is gradually increased until the steam turbine cylinder completely enters the steam, the sliding pressure operation mode is entered, the steam bypass system of the steam turbine is closed, and the temperature matching is completed; after the temperature matching is completed, the 9FA single-shaft combined cycle unit enters a gas turbine and steam turbine combined cycle operation mode, and the load of a steam turbine can be increased along with the load increase of the gas turbine;
Fifthly, switching the smoke exhaust temperature control curve of the gas turbine to a conventional smoke exhaust control curve;
And sixthly, continuously loading the 9FA single-shaft combined cycle unit to full load.
The decoupling operation method of the 9FA single-shaft combined cycle unit gas turbine and the steam turbine reduces the exhaust temperature of the 9FA gas turbine with a DLN2.0+ combustion chamber from the traditional 648.9 ℃ to 593.3 ℃, and the 9FA gas turbine is independently loaded to 180MW before the 9FA single-shaft combined cycle unit completes temperature matching, so that the decoupling operation of the gas turbine and the steam turbine is realized.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. A method for decoupling operation of a 9FA single-shaft combined cycle unit, the method being based on a warfarin blue maxCHD control system, comprising:
Firstly, when a 9FA single-shaft combined cycle unit provided with a DLN2.0+ combustion chamber is started, a gas turbine is firstly ignited and started, smoke discharged by the gas turbine enters a waste heat boiler, and a steam bypass system of the steam turbine is started;
Secondly, the gas turbine is subjected to full-speed no-load lifting, the natural gas fuel is heated by the hot water from the outlet of the medium-pressure economizer of the waste heat boiler or the heat source of the electric heater, and when the natural gas fuel temperature reaches 150-185 ℃, the gas turbine continues to lift the load;
thirdly, the exhaust gas temperature of the gas turbine increases along with the increase of the load, in order to avoid that the exhaust gas temperature of the gas turbine exceeds the allowable upper temperature limit of the metal material of the waste heat boiler, the exhaust gas temperature Tx of the gas turbine is set according to the allowable upper temperature limit 565-600 ℃ of the metal material of the waste heat boiler, and a new exhaust gas temperature control curve is calculated and re-established according to the exhaust gas temperature Tx of the gas turbine;
When the gas turbine exhaust gas temperature rises and reaches Tx, the gas turbine exhaust gas control curve is switched from the conventional exhaust gas control curve to an exhaust gas control curve with the exhaust gas temperature of Tx, and when the gas turbine load continues to rise, the gas turbine exhaust gas temperature is kept unchanged at Tx;
Fourthly, when the gas turbine reaches a specified load MW, the gas turbine load MW is required to be the specified load with the exhaust gas temperature higher than 371.1 ℃, the gas turbine keeps the load MW and the exhaust gas temperature unchanged, the preheating of the waste heat boiler and the steam turbine is waited for, the temperature matching is started, at the moment, the flow of steam generated by the waste heat boiler entering the steam turbine cylinder is gradually increased until the steam turbine cylinder completely enters the steam, the steam turbine enters a sliding pressure operation mode, a steam bypass system of the steam turbine is closed, and the temperature matching is completed; after the temperature matching is completed, the 9FA single-shaft combined cycle unit enters a gas turbine and steam turbine combined cycle operation mode, and the load of a steam turbine can be increased along with the load increase of the gas turbine;
Fifthly, switching the smoke exhaust temperature control curve of the gas turbine to a conventional smoke exhaust control curve;
and step six, continuously loading the 9FA single-shaft combined cycle unit to full load.
2. The method for decoupled operation of a 9FA single-shaft combined cycle unit according to claim 1, wherein in the fourth step the gas turbine reaches a specified load MW with a flue gas temperature higher than 371.1 ℃ and maintains the flue gas temperature at Tx, under which conditions temperature matching is performed.
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