CN115419479A - Method for reducing emission of nitrogen oxides during starting of combined cycle unit - Google Patents
Method for reducing emission of nitrogen oxides during starting of combined cycle unit Download PDFInfo
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- CN115419479A CN115419479A CN202210839617.7A CN202210839617A CN115419479A CN 115419479 A CN115419479 A CN 115419479A CN 202210839617 A CN202210839617 A CN 202210839617A CN 115419479 A CN115419479 A CN 115419479A
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 188
- 238000002485 combustion reaction Methods 0.000 claims abstract description 36
- 239000000779 smoke Substances 0.000 claims abstract description 34
- 239000002918 waste heat Substances 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 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 9
- 239000003345 natural gas Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000012821 model calculation Methods 0.000 abstract 1
- 238000004904 shortening Methods 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940102872 bluemax Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
-
- 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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- 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
- 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
- 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
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
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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
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/224—Heating fuel before feeding to the burner
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
- F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
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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
- Y02E20/16—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)
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- Life Sciences & Earth Sciences (AREA)
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- 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 method for reducing nitrogen oxide emission when a combined cycle unit is started. The method for reducing nitrogen oxide emission during the startup of the combined cycle unit is realized byPerforming model calculation to obtain a new 9FA gas turbine hot-state starting exhaust gas temperature curve with DLN2.0+ combustion chamber, thereby optimizing the exhaust gas temperature of the gas turbine when in hot-state starting, performing combined cycle temperature matching when the gas turbine operates in a premixed combustion mode, and shortening the concentration to exceed 50mg/m 3 The emission time of nitrogen oxides and the vision are the emission time of yellow smoke, so that the emission of the nitrogen oxides is reduced when the combined cycle unit is started, and meanwhile, the waste heat boiler is not over-temperature when the temperature is matched.
Description
Technical Field
The invention relates to a combined cycle unit, in particular to a method for reducing nitrogen oxide emission when the combined cycle unit is started.
Background
Currently, a 9FA single shaft combined cycle unit with a DLN2.0+ combustor is originally designed by the General Electric (GE) company of the original manufacturer. When the 9FA single-shaft combined cycle unit provided with the DLN2.0+ combustion chamber is started, the 9FA gas turbine is firstly ignited and started, and exhaust gas enters a waste heat boiler, and the steam turbine does not exert power. When the load of a 9FA gas turbine is increased to about 50MW to 60MW, the exhaust gas temperature must be kept unchanged at the load, preheating of a waste heat boiler and a steam turbine is waited, temperature matching is carried out until the steam turbine completely enters a sliding pressure operation mode, temperature matching is completed, and at the moment, 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 increase the load, and the steam turbine load increases as the gas turbine load increases. When the load of a 9FA gas turbine provided with a DLN2.0+ combustion chamber is matched with the temperature in the operation of 50MW to 60MW, the combustion mode is a pilot premixed combustion mode, is corrected according to 15% oxygen content, and has a mass concentration exceeding 50mg/m 3 Nitrogen oxides are discharged, and a large amount of yellow smoke is discharged through visual observation; the hot-state starting temperature matching time of a 9FA single-shaft combined cycle unit provided with a DLN2.0+ combustion chamber is 20-30 minutes, the matching time of the hot-state starting temperature and the cold-state starting temperature is longer, and a large amount of yellow smoke is discharged in the period.
Under the design condition, the minimum load of the 9FA gas turbine of the 9FA single-shaft combined cycle unit provided with the DLN2.0+ combustion chamber is 150MW when the gas turbine is switched to the premixed combustion modeThe nitrogen oxide emission concentration of the gas turbine can be reduced to 50mg/m under the high pressure load 3 Hereinafter, no yellow smoke is emitted. On the other hand, if the lift load alone exceeds 60MW at the start-up of the 9FA gas turbine, its exhaust gas temperature will exceed the allowable temperature of the waste heat boiler metal material, causing an operational risk, which is prohibited by the plant operation. The traditional starting process of the original factory can be obtained, the operation of the 9FA single-shaft combined cycle unit provided with the DLN2.0+ combustion chamber can continue to increase the load only after the temperature matching of the steam turbine is completed when the load of the 9FA gas turbine reaches 50MW to 60MW, and the 9FA gas turbine can not be separated from the steam turbine to independently increase the load and is switched to a premixed combustion mode. Currently, for a 9FA single-shaft combined cycle unit with a DLN2.0+ combustion chamber, general electric company (GE) of original manufacturers has a nitrogen oxide concentration of over 50mg/m at the start-up of the DLN2.0+ combustion chamber 3 The proposal and the scheme of yellow smoke emission are to replace and upgrade a DLN2.0+ combustion chamber into a DLN2.6+ combustion chamber, so the cost is high; there is also no commercially viable method or solution to shorten 9FA gas turbines equipped with DLN2.0+ combustors to concentrations in excess of 50mg/m 3 The emission time of nitrogen oxides is visually reduced to shorten the emission time of yellow smoke, thereby reducing the emission of nitrogen oxides during the hot start of the gas turbine.
Disclosure of Invention
The invention aims to solve the defects and provides a method for reducing nitrogen oxide emission when a combined cycle unit is started.
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 reducing nitrogen oxide emission during startup of the combined cycle unit is based on a Hua Ci blue max CHD 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, the exhaust smoke of the gas turbine enters a waste heat boiler, and a steam bypass system of a steam turbine is started;
secondly, the gas turbine raises the load through full speed no-load, waits for the heat source from the hot water at the outlet of the medium-pressure economizer of the waste heat boiler or the electric heater to heat the natural gas fuel, and heats the natural gasWhen the fuel temperature reaches 150-185 ℃, the load of the gas turbine is continuously increased, the load is corrected according to the 15 percent oxygen content, and the emission concentration of the nitrogen oxide exceeds 50mg/m 3 Yellow smoke is discharged;
thirdly, the exhaust gas temperature of the gas turbine is increased along with the increase of the load, in order to avoid the exhaust gas temperature of the gas turbine exceeding the allowable temperature of the metal material of the waste heat boiler, the exhaust gas temperature Tx1 of the gas turbine is set according to the allowable temperature of the metal material of the waste heat boiler ranging from 565 ℃ to 600 ℃, a new exhaust gas temperature control curve is calculated and established according to the exhaust gas temperature Tx1 of the gas turbine, and the load MW1 of the gas turbine during the switching of the premixed combustion mode of the gas turbine is calculated at the same time;
when the exhaust gas temperature of the gas turbine rises and reaches Tx1, the exhaust gas control curve of the gas turbine is switched to the exhaust gas control curve with the exhaust gas temperature Tx1 from the conventional exhaust gas control curve, when the load of the gas turbine continues to rise, the exhaust gas temperature of the gas turbine is kept at Tx1 and is unchanged, the exhaust gas temperature is corrected according to 15% oxygen content, the concentration of nitrogen oxides exceeds 50mg/m3, and yellow smoke is discharged;
fourthly, when the load of the gas turbine reaches a specified load MW1 and the operation is switched to a premixed combustion mode, correcting according to the oxygen content of 15 percent, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and eliminating the emission of yellow smoke; the method comprises the following steps that a gas turbine keeps load MW1 and exhaust gas temperature Tx1 unchanged, preheating of a waste heat boiler and a steam turbine is waited, temperature matching is started, at the moment, the flow of steam generated by the waste heat boiler entering a steam turbine cylinder starts to increase gradually until the steam turbine cylinder enters steam completely, a sliding pressure operation mode is entered, a steam bypass system of the steam turbine is closed, temperature matching is completed, after the temperature matching is completed, a 9FA single-shaft combined cycle unit enters a gas turbine and steam turbine combined cycle operation mode, and the load of the steam turbine can be increased along with the load increase of the gas turbine;
fifthly, switching the exhaust gas temperature control curve of the gas turbine to a conventional exhaust gas control curve, correcting according to 15% oxygen content, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and avoiding yellow smoke emission;
sixthly, the 9FA single-shaft combined cycle unit can be continuously loaded to full load, corrected according to 15 percent of oxygen content and subjected to nitrogen oxidationThe discharge concentration of the substance is reduced to 50mg/m 3 Hereinafter, no yellow smoke is emitted.
According to another embodiment of the present invention, the fourth step further comprises that the gas turbine reaches the specified load MW1 and has switched to the premixed combustion mode and keeps the exhaust gas temperature Tx1 constant, and the temperature matching is performed under the condition that the corrected oxygen content of 15% is changed, and the emission concentration of the nitrogen oxides is reduced to below 50mg/m3 without yellow smoke emission.
The invention has the beneficial effects that: according to the method for reducing the emission of nitrogen oxides during the starting of the combined cycle unit, the temperature curve of hot exhaust gas of the gas turbine is optimized and modified, so that the gas turbine of the 9FA single-shaft combined cycle unit can be independently loaded, and the temperature matching of the waste heat boiler and the steam turbine is carried out after the gas turbine enters a premixed combustion mode. The nitrogen oxide emission is reduced when the 9FA single-shaft combined cycle unit is started in a hot state.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete description of the technical solutions in the embodiments of the present invention, it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When a 9FA gas turbine is started by using a traditional starting curve, in order to avoid the overtemperature of a waste heat boiler and a steam turbine, the temperature matching of the waste heat boiler and the steam turbine needs to be waited at the load of the 50MW to 60MW gas turbine. The method for reducing the emission of nitrogen oxides during the starting of the combined cycle unit is based on a Hua-Ci-blue MaxCHD control system, the gas turbine of the 9FA single-shaft combined cycle unit can be independently loaded by optimizing and modifying the thermal state exhaust gas temperature curve of the gas turbine, the temperature matching is carried out on the operation load after the gas turbine enters a premixed combustion mode, and meanwhile, the exhaust gas temperature of the gas turbine is ensured to be in the temperature range allowed by the metal of a waste heat boiler, so that the emission of nitrogen oxides is reduced during the thermal state starting of the combined cycle unit.
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 ignited and started firstly, the exhaust gas of the gas turbine enters a waste heat boiler, and a steam bypass system of a steam turbine is started;
secondly, the gas turbine raises the load at full speed and no-load, waits for the heat source from hot water at the outlet of a medium-pressure economizer of the waste heat boiler or an electric heater to heat the natural gas fuel, and when the temperature of the natural gas fuel reaches 150-185 ℃, the gas turbine continues to raise the load, the load is corrected according to 15% oxygen content, the emission concentration of nitrogen oxides exceeds 50mg/m & lt 3 & gt, and yellow smoke is emitted;
thirdly, the exhaust gas temperature of the gas turbine is increased along with the increase of the load, the exhaust gas temperature of the gas turbine can reach as high as 648.9 ℃, in order to avoid the exhaust gas temperature of the gas turbine exceeding the allowable temperature of the metal material of the waste heat boiler, the exhaust gas temperature Tx1 of the gas turbine is set according to the allowable temperature of the metal material of the waste heat boiler from 565 ℃ to 600 ℃, a new exhaust gas temperature control curve is calculated and established according to the exhaust gas temperature Tx1 of the gas turbine, and the load MW1 of the gas turbine during the switching of the premixed combustion mode of the gas turbine is calculated;
when the exhaust gas temperature of the gas turbine rises and reaches Tx1, the exhaust gas control curve of the gas turbine is switched from the conventional exhaust gas control curve to the exhaust gas control curve with the exhaust gas temperature Tx1, when the load of the gas turbine continues to rise, the exhaust gas temperature of the gas turbine is kept at Tx1 and is corrected according to the oxygen content of 15 percent, the emission concentration of nitrogen oxides exceeds 50mg/m3, and yellow smoke is emitted;
fourthly, when the load of the gas turbine reaches a specified load MW1 and the operation is switched to a premixed combustion mode, correcting according to the oxygen content of 15 percent, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and eliminating the emission of yellow smoke; the gas turbine keeps the load MW1 and the exhaust gas temperature Tx1 unchanged, waits for preheating of the waste heat boiler and the steam turbine, starts temperature matching, and then the flow of steam generated by the waste heat boiler entering a steam turbine cylinder starts to increase gradually until the steam turbine cylinder enters steam completely, 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 finished, the 9FA single-shaft combined cycle unit enters a combined cycle operation mode of a gas turbine and a steam turbine, and the load of the steam turbine is increased along with the increase of the load of the gas turbine;
fifthly, switching the exhaust gas temperature control curve of the gas turbine to a conventional exhaust gas control curve, correcting according to 15% oxygen content, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and avoiding yellow smoke emission;
and sixthly, the 9FA single-shaft combined cycle unit can be continuously loaded to full load and corrected according to 15 percent of oxygen content, the emission concentration of nitrogen oxides is reduced to be below 50mg/m < 3 >, and no yellow smoke is emitted.
And in the fourth step, the gas turbine reaches a specified load MW1, is switched to a premixed combustion mode, keeps the exhaust gas temperature Tx1 unchanged, and performs temperature matching under the condition, wherein the exhaust gas concentration is reduced to below 50mg/m < 3 > by correcting according to 15% of oxygen content, and no yellow smoke is emitted.
When the gas turbine of the 9FA single-shaft combined cycle unit provided with the DLN2.0+ combustion chamber is operated by using a new smoke discharge control curve with the maximum smoke discharge temperature Tx1, the metal material is ensured not to be over-heated when the waste heat boiler is preheated, and the operation is safe.
The natural gas fuel quantity of the 9FA gas turbine and the load MW1 of the gas turbine, the reference combustion temperature of the gas turbine, are calculated by the following method:
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；
an expanse, jianghandade and the like, namely a gas turbine combustion reference temperature estimation method, a gas turbine technology, volume 27, no. 4, pages 11 to 16, and 12 months in 2014;
power generation equipment for reducing nitrogen oxide emission when a combined cycle unit of Wangxinggang is started, 2006 No.5, 326-330, 2006.
Example (b):
firstly, when a 9FA single-shaft combined cycle unit provided with a DLN2.0+ combustion chamber is started in a hot state, a gas turbine is ignited and started at first, the exhaust gas of the gas turbine enters a waste heat boiler, and a steam bypass system of a steam turbine is started;
secondly, the load of the gas turbine is lifted at full speed in a no-load manner, the natural gas fuel is heated by hot water from an outlet of a medium-pressure economizer of the waste heat boiler, when the temperature of the natural gas fuel reaches 160 ℃, the load of the gas turbine is continuously lifted, the load is corrected according to 15 percent of oxygen content, the emission concentration of nitrogen oxides exceeds 50mg/m & lt 3 & gt, and yellow smoke is emitted;
and thirdly, the exhaust gas temperature of the gas turbine is increased along with the increase of the load, and the maximum exhaust gas temperature of the gas turbine can reach 648.9 ℃. In order to avoid the exhaust gas temperature of the gas turbine exceeding the allowable temperature of the waste heat boiler metal material by 600 ℃, setting the exhaust gas temperature of the gas turbine to be 593.3 ℃ according to the allowable temperature of the waste heat boiler metal material, and calculating and establishing a new exhaust gas temperature control curve according to the exhaust gas temperature of the gas turbine to be 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 at 648.9 ℃ to the exhaust gas control curve at 593.3 ℃, when the load of the gas turbine is continuously increased, the exhaust gas temperature of the gas turbine is kept unchanged at 593.3 ℃, the exhaust gas temperature is corrected according to 15 percent of oxygen content, the emission concentration of nitrogen oxides exceeds 50mg/m & lt 3 & gt, and yellow smoke is emitted;
fourthly, when the load of the gas turbine reaches 180MW of specified load and is switched to a premixed combustion mode to operate, correcting according to 15% of oxygen content, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and eliminating yellow smoke emission; the gas turbine keeps load 180MW and exhaust gas temperature 593.3 ℃ unchanged, waits for preheating of the waste heat boiler and the steam turbine, starts temperature matching, and at the moment, the flow of steam generated by the waste heat boiler entering a steam turbine cylinder starts to be gradually increased until the steam turbine cylinder completely enters steam, enters a sliding pressure operation mode, a steam bypass system of the steam turbine is closed, and temperature matching is completed; after the temperature matching is finished, the 9FA single-shaft combined cycle unit enters a combined cycle operation mode of a gas turbine and a steam turbine, and the load of the steam turbine is increased along with the increase of the load of the gas turbine;
fifthly, switching the exhaust gas temperature control curve of the gas turbine to a conventional exhaust gas control curve, correcting according to 15 percent oxygen content, and reducing the emission concentration of nitrogen oxides to 50mg/m 3 No yellow smoke is emitted below;
sixthly, the 9FA single-shaft combined cycle unit can be continuously loaded to full load and corrected according to 15 percent of oxygen content, and the emission concentration of nitrogen oxide is reduced to 50mg/m 3 Hereinafter, no yellow smoke is emitted.
The method for reducing the emission of nitrogen oxides during the starting of the combined cycle unit reduces the exhaust gas temperature of a 9FA gas turbine provided with a DLN2.0+ combustion chamber from 648.9 ℃ to 593.3 ℃, the 9FA gas turbine is loaded to 180MW and enters a premixed combustion mode before the 9FA single-shaft combined cycle unit finishes temperature matching in the thermal state starting, the emission concentration of the nitrogen oxides in the temperature matching process is reduced, the nitrogen oxides are corrected according to 15% of oxygen content, and the emission concentration of the nitrogen oxides is from 90mg to 110mg/m 3 Reduced to 50mg/m 3 The emission time of yellow smoke at the hot start of the combined cycle is reduced from 50 to 55 minutes to 25 to 30 minutes, so that the emission of nitrogen oxides is reduced when the combined cycle unit is started.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (2)
1. Method for reducing nitrogen oxide emissions at start-up of a combined cycle plant, characterized in that the method is based on a Hua electric Rui 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, the exhaust smoke of the gas turbine enters a waste heat boiler, and a steam bypass system of a steam turbine is started;
secondly, the gas turbine raises the load in a full-speed no-load way, waits for the heat source from hot water at the outlet of a medium-pressure economizer of the waste heat boiler or an electric heater to heat the natural gas fuel, and continues to raise the load when the temperature of the natural gas fuel reaches 150-185 ℃, the load is corrected according to 15% of oxygen content, the emission concentration of nitrogen oxides exceeds 50mg/m & lt 3 & gt, and yellow smoke is discharged;
thirdly, the exhaust gas temperature of the gas turbine is increased along with the increase of the load, in order to avoid the exhaust gas temperature of the gas turbine exceeding the allowable upper temperature limit of the metal material of the waste heat boiler, the exhaust gas temperature Tx1 of the gas turbine is set according to the allowable upper temperature limit of the metal material of the waste heat boiler at 565-600 ℃, a new exhaust gas temperature control curve is calculated and established according to the exhaust gas temperature Tx1 of the gas turbine, and the load MW1 of the gas turbine during the switching of the premixed combustion mode of the gas turbine is calculated at the same time;
when the exhaust gas temperature of the gas turbine rises and reaches Tx1, the exhaust gas control curve of the gas turbine is switched to the exhaust gas control curve with the exhaust gas temperature Tx1 from the conventional exhaust gas control curve, when the load of the gas turbine continues to rise, the exhaust gas temperature of the gas turbine is kept at Tx1 and is corrected according to 15% oxygen content, the emission concentration of nitrogen oxides exceeds 50mg/m3, and yellow smoke is emitted;
fourthly, when the load of the gas turbine reaches MW1 and the gas turbine is switched to a premixed combustion mode to operate, correcting according to the oxygen content of 15 percent, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and eliminating yellow smoke emission; the gas turbine keeps the load MW1 and the exhaust gas temperature unchanged, waits for preheating of the waste heat boiler and the steam turbine, starts temperature matching, and then the flow of steam generated by the waste heat boiler entering a steam turbine cylinder starts to increase gradually until the steam turbine cylinder enters the steam completely, 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 finished, the 9FA single-shaft combined cycle unit enters a combined cycle operation mode of a gas turbine and a steam turbine, and the load of the steam turbine is increased along with the increase of the load of the gas turbine;
fifthly, switching the exhaust gas temperature control curve of the gas turbine to a conventional exhaust gas control curve, correcting according to 15% oxygen content, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and avoiding yellow smoke emission;
and sixthly, continuously loading the 9FA single-shaft combined cycle unit to full load, correcting according to 15% oxygen content, reducing the emission concentration of nitrogen oxides to be below 50mg/m < 3 >, and avoiding yellow smoke emission.
2. The method for reducing NOx emissions during startup of a combined cycle plant of claim 1, wherein in said fourth step the gas turbine reaches a specified load MW1 and switches to premixed combustion mode operation with the exhaust temperature Tx1 constant, and temperature matching is performed under conditions where, corrected for 15% oxygen, NOx emission concentration is reduced to 50mg/m 3 Hereinafter, no yellow smoke is emitted.
Priority Applications (1)
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| US4578944A (en) * | 1984-10-25 | 1986-04-01 | Westinghouse Electric Corp. | Heat recovery steam generator outlet temperature control system for a combined cycle power plant |
| US5044152A (en) * | 1988-05-11 | 1991-09-03 | Hitachi, Ltd. | Method of operating a combined plant |
| JPH07310505A (en) * | 1994-05-16 | 1995-11-28 | Toshiba Corp | Staring method and device for uni-axis type combined cycle plant |
| CN107304689A (en) * | 2016-04-22 | 2017-10-31 | 北京澳尔金石油技术开发有限公司 | A kind of gas turbine and its whole Combined Cycle Unit temperature-adjusting device and method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4578944A (en) * | 1984-10-25 | 1986-04-01 | Westinghouse Electric Corp. | Heat recovery steam generator outlet temperature control system for a combined cycle power plant |
| US5044152A (en) * | 1988-05-11 | 1991-09-03 | Hitachi, Ltd. | Method of operating a combined plant |
| JPH07310505A (en) * | 1994-05-16 | 1995-11-28 | Toshiba Corp | Staring method and device for uni-axis type combined cycle plant |
| CN107304689A (en) * | 2016-04-22 | 2017-10-31 | 北京澳尔金石油技术开发有限公司 | A kind of gas turbine and its whole Combined Cycle Unit temperature-adjusting device and method |
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| Title |
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| 李建伟;苏烨;毛志伟;陈凯;: "西门子SGT5-8000H级燃气轮机排气温度的控制", 浙江电力, no. 03, 25 March 2020 (2020-03-25), pages 86 - 91 * |
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