CN111691985A - Control method for reducing NOx emission of DLN-2.6 combustion system of gas turbine unit - Google Patents
Control method for reducing NOx emission of DLN-2.6 combustion system of gas turbine unit Download PDFInfo
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- CN111691985A CN111691985A CN202010534601.6A CN202010534601A CN111691985A CN 111691985 A CN111691985 A CN 111691985A CN 202010534601 A CN202010534601 A CN 202010534601A CN 111691985 A CN111691985 A CN 111691985A
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- gas turbine
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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
- F02C9/48—Control of fuel supply conjointly with another control of the plant
- F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
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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
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a method for reducing NO of DLN-2.6 combustion system of gas turbine unitXThe discharge control method is technically characterized in that: when the gas turbine set is in a starting stage, 5 fuel nozzles are in a diffusion mode; setting NO of gas turbineXUpper limit of emission when NOXWhen the emission reaches the upper limit, a premixing mode is added, diffusion combustion is executed, and meanwhile, the k value of the function is adjusted to ensure the premixing proportion; the proportional natural gas air, D5, is mixed into the natural gas before the PM1 or PM4 control valve, depending on the premix ratio. The invention ensures the premixing proportion by adjusting the k value of the combustion quantity function in the premixing mode, thereby ensuring that the gas turbine set ensures the full combustion of the gas at the starting stage and reducing NOXAnd the emission is realized, and the phenomenon that the normal speed rise of the unit is influenced because the combustion engine surges when the unit is started due to insufficient combustion is avoided. The invention can ensure the stable operation of the gas turbine unit, and can reduce the loss to the minimum under special conditions, and more particularlyThe long-term stable operation of the power grid can be ensured.
Description
Technical Field
The invention belongs to the technical field of automatic power generation control of units, and particularly relates to a control method for reducing NOX emission of a DLN-2.6 combustion system of a gas unit.
Background
The gas turbine as a power grid peak shaving unit is frequently started and stopped, high-concentration NOX can be generated in the starting process, yellow-brown smoke can appear in a chimney, and the smoke generating device is sensitive to social influence.
The main valve for the gas turbine to enter the gas is called a speed ratio stop valve (SRV), which has two functions, the first and most important function is as a stop valve in actual operation and is a component of a protection system. An electrical shut-off or normal shutdown closes the valve to prevent gas from entering the turbine. There are two methods of closing the ratio valve: the hydraulic oil is drained from the hydraulic slave cylinder of the speed ratio valve or the valve is closed with an electrical signal using a speed ratio valve position control loop in the protection system. The speed ratio valve also functions as a pressure regulating valve, and the control system uses the speed ratio valve to regulate the pressure in front of the gas shutoff valve. After passing through the speed ratio stop valve, the engine enters a combustion chamber of the internal combustion engine, and a PM1 control valve and a PM4 control valve exist in the engine.
The performance and reliability of a combustion engine depends on the intake air quality and purity of the combustion engine. The quality of the air varies over time during the year and even more over a time range of several hours. Dirty air can foul the compressor. Compressor fouling reduces the power and efficiency of the turbine. Therefore, to operate efficiently, the atmosphere entering the combustion engine needs to be treated to filter out the pollution. The air inlet system is used for improving the quality of air supplied to the air compressor inlet of the combustion engine. Specially designed to improve the air quality under various conditions of temperature, humidity and pollution, making it more suitable for combustion engines.
The combustion engine inlet ductwork directs the flow of air into the plenum chamber at a minimum pressure drop from the inlet filter housing. Meanwhile, a silencer device is arranged on the inlet pipeline to reduce noise so as to meet the relevant regulation requirements.
The next component that allows air to flow through is a bleed heater system, which helps prevent compressor freezing and serves to reduce radiation. The elbow then redirects the air downward into the inlet plenum, creating a laminar flow by reducing the flow area. Two piece filter screens are arranged in the bent pipe to prevent foreign matters from damaging the combustion engine. The elbow facilitates field installation and isolates the inlet system load from the combustion engine load. Where D5 is the combustion chamber intake valve.
Through research, investigation and analysis, the combustion chamber of the gas turbine generator set is in a split-pipe dry type low nitrogen (DLN2.6) structure. The burner is circumferentially arranged and is arranged anticlockwise when viewed along the airflow direction, 5 fuel nozzles are arranged in each burner, the middle ring is fed with premixed natural gas from a D5 control valve, and the outer ring is provided with 2 premixed natural gas or diffused natural gas from a PM1 or PM4 control valve. The diffusion mode combustion can produce a large amount of NOX to cause pollution, the premixing mode combustion is that natural gas and air are mixed before entering a combustion chamber and then enter the combustion chamber to be combusted, the combustion temperature is low, but the combustion is easy to be insufficient, when the premixing natural gas or the diffusion natural gas are respectively carried out, the combustion is not uniform to cause the surge of a combustion engine, and the unplanned shutdown of a unit can be seriously caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for reducing NO of a DLN-2.6 combustion system of a combustion engineXThe emission control method can improve the combustion efficiency of the gas turbine unit and reduce NOXAnd (5) discharging.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
reduce gas turbine unit DLN-2.6 combustion system NOXA method of controlling emissions, comprising the steps of:
step 2, setting NO of DLN-2.6 combustion system of gas turbine unitXUpper limit of discharge amount, NO of gas turbine DLN-2.6 combustion systemXThe emission increases along with the increase of the rotating speed of the DLN-2.6 combustion system of the gas turbine set, and the NO of the DLN-2.6 combustion system of the current gas turbine set is judgedXWhether the discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXUpper limit of discharge amount, if gas turbine DLN-2.6 combustion system NOXNO of combustion system with discharge not reaching DLN-2.6 of gas turbine setXUpper limit of discharge amount, gasThe DLN-2.6 combustion system of the gas turbine set continues to execute the diffusion mode, if the NO of the DLN-2.6 combustion system of the gas turbine setXThe discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXThe upper limit of the emission is that a premixing mode is added to the DLN-2.6 combustion system of the gas turbine unit;
and 3, adjusting the premixing proportion in the premixing mode of the DLN-2.6 combustion system of the gas turbine set along with the continuous increase of the rotating speed of the DLN-2.6 combustion system of the gas turbine set, and ensuring the NO of the DLN-2.6 combustion system of the gas turbine setXThe discharge amount is stable.
And in the step 1, the combustion system of the gas turbine unit DLN-2.6 is in a starting stage before the constant speed of 3000 revolutions.
In addition, in the step 2, the gas turbine set DLN-2.6 combustion system NOXThe upper limit of the discharge amount is 30mg/m3。
And in the step 2, the premixing mode is that air and natural gas are mixed before entering a combustion chamber of the combustion system of the gas turbine set DLN-2.6 and are combusted in the combustion chamber.
In step 3, the method for adjusting the premixing proportion in the premixing mode of the DLN-2.6 combustion system of the gas turbine unit comprises the step of adjusting the NO of the DLN-2.6 combustion system of the gas turbine unit by adjusting the mixing proportion value of natural gas and airXThe amount of discharge of (c).
And the mixing ratio value of the natural gas and the air and the NO of a DLN-2.6 combustion system of the gas unitXThe relationship of the discharge amount of
Y＝kx+b
Wherein Y is NO of DLN-2.6 combustion system of gas turbine unitXThe discharge amount, x is the flame temperature, b is the actual oxygen intake amount, and k is the mixing ratio of natural gas and air.
The invention has the advantages and positive effects that:
1. the invention ensures the premixing proportion by adjusting the k value of the combustion quantity function in the premixing mode, thereby ensuring that the gas turbine set ensures the full combustion of the gas at the starting stage and reducing NOXAnd the emission is realized, and the phenomenon that the normal speed rise of the unit is influenced because the combustion engine surges when the unit is started due to insufficient combustion is avoided.
2. The invention can ensure the stable operation of the gas turbine set, can minimize the loss under special conditions, and can further ensure the long-term stable operation of the power grid.
Drawings
FIG. 1 is a diagram of a ducted dry low nitrogen (DLN2.6) configuration type combustor;
FIG. 2 is a schematic view of a split-tube dry low nitrogen (DLN2.6) configuration type combustor fuel nozzle;
FIG. 3 is a graph of the flame temperature and NOx emissions during a gas turbine engine speed of less than 3000 revolutions according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Reduce gas turbine unit DLN-2.6 combustion system NOXA method of controlling emissions, comprising the steps of:
Step 2, setting NO of DLN-2.6 combustion system of gas turbine unitXThe upper limit of the discharge amount is 30mg/m3NO of DLN-2.6 combustion system of gas turbine setXThe emission increases along with the increase of the rotating speed of the DLN-2.6 combustion system of the gas turbine set, and the NO of the DLN-2.6 combustion system of the current gas turbine set is judgedXWhether the discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXThe upper limit of the discharge amount is 30mg/m3If the gas turbine set DLN-2.6 combustion system NOXNO of combustion system with discharge not reaching DLN-2.6 of gas turbine setXThe upper limit of the discharge amount is 30mg/m3If the gas turbine set DLN-2.6 combustion system continues to execute the diffusion mode, if the gas turbine set DLN-2.6 combustion system does not execute the diffusion mode, the gas turbine set DLN-2.6 combustion system continues to execute the diffusion modeXThe discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXThe upper limit of the discharge amount is 30mg/m3And increasing a premixing mode for the DLN-2.6 combustion system of the gas turbine unit.
In the step, the premixing mode is that air and natural gas are mixed before entering a combustion chamber of the combustion system of the gas turbine set DLN-2.6 and are combusted in the combustion chamber.
And 3, adjusting the premixing proportion in the premixing mode of the DLN-2.6 combustion system of the gas turbine set along with the continuous increase of the rotating speed of the DLN-2.6 combustion system of the gas turbine set, and ensuring the NO of the DLN-2.6 combustion system of the gas turbine setXThe discharge amount is stable.
The method for adjusting the premixing proportion in the premixing mode of the DLN-2.6 combustion system of the gas turbine unit in the step comprises the step of adjusting the NO of the DLN-2.6 combustion system of the gas turbine unit by adjusting the mixing proportion value of natural gas and airXThe discharge amount of the fuel gas, wherein the mixing ratio of the natural gas and the air and the NO of a DLN-2.6 combustion system of a gas turbine unitXThe relationship of the discharge amount of
Y＝kx+b
Wherein Y is NO of DLN-2.6 combustion system of gas turbine unitXThe discharge amount, x is the flame temperature, b is the actual oxygen intake amount, and k is the mixing ratio of natural gas and air.
According to the control method for reducing the NOX emission of the DLN-2.6 combustion system of the gas turbine set, the DLN-2.6 combustion system of a certain existing gas turbine set is tested to prove the effect of the invention.
NO when DLN-2.6 combustion system of certain gas turbine set is in starting stageXThe discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXThe upper limit of the discharge amount is 30mg/m3Then, the premix mode is increased. In the premixing mode, the mixing ratio of natural gas and air and the NO of the DLN-2.6 combustion system of the gas turbine unitXThe discharge amount relationship of (a) is 2x + b.
When the flame temperature rises along with the rotation speed rise of the DLN-2.6 combustion system of the gas turbine set, the k value is continuously changed from 2 to ensure the NO of the DLN-2.6 combustion system of the gas turbine setXThe discharge amount is not more than 30mg/m3Detecting the flame temperature and the NO of the DLN-2.6 combustion system of the gas turbine set in the process that the rotating speed of the gas turbine set is less than 3000 revolutions as shown in figure 3XThe discharge amount of (1), wherein the flame temperature is 1650K-1950K, and the gas turbine DLN-2.6 combustion system NOXThe discharge concentration of the catalyst is 1ppm-10 ppm.
Wherein when the fire is onFlame temperature and gas turbine DLN-2.6 combustion system NOXWhen the discharge amount curve is Y-0.02 x-33, the optimal operation curve of the combustion load is obtained, and the unit discharge meets the standard.
However, in the process of testing for many times, because different uncertain factors occur in the DLN-2.6 combustion system of the gas turbine unit, the flame temperature and NO of the DLN-2.6 combustion system of the gas turbine unit are causedXSo that the k value takes 0-0.04 and increases or decreases linearly in units of 0.001, and finally the nitrogen oxide emissions are controlled to be less than 30mg/m3To meet the specifications.
By using the invention to test the DLN-2.6 combustion system of a certain existing gas unit, the invention can control the NO of the DLN-2.6 combustion system of the gas unitXAnd the long-term stable operation of the power grid can be ensured.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (6)
1. Reduce gas turbine unit DLN-2.6 combustion system NOXA method of controlling emissions, characterized by the steps of:
step 1, judging whether a DLN-2.6 combustion system of a gas turbine set is in a starting stage, if the DLN-2.6 combustion system of the gas turbine set is in the starting stage, executing a diffusion mode by the DLN-2.6 combustion system of the gas turbine set, and if the DLN-2.6 combustion system of the gas turbine set is not in the starting stage, continuing judging;
step 2, setting NO of DLN-2.6 combustion system of gas turbine unitXUpper limit of discharge amount, NO of gas turbine DLN-2.6 combustion systemXThe emission increases along with the increase of the rotating speed of the DLN-2.6 combustion system of the gas turbine set, and the NO of the DLN-2.6 combustion system of the current gas turbine set is judgedXWhether the discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXUpper limit of discharge amount, if gas turbine DLN-2.6 combustion system NOXNO of combustion system with discharge not reaching DLN-2.6 of gas turbine setXAnd (4) if the upper limit of the discharge amount is reached, the gas turbine DLN-2.6 combustion system continues to execute the diffusion mode, and if the gas turbine DLN-2.6 combustion system does not have the NO, the gas turbine DLN-2.6 combustion system continues to execute the diffusion modeXThe discharge amount reaches the NO of DLN-2.6 combustion system of the gas unitXThe upper limit of the emission is that a premixing mode is added to the DLN-2.6 combustion system of the gas turbine unit;
and 3, adjusting the premixing proportion in the premixing mode of the DLN-2.6 combustion system of the gas turbine set along with the continuous increase of the rotating speed of the DLN-2.6 combustion system of the gas turbine set, and ensuring the NO of the DLN-2.6 combustion system of the gas turbine setXThe discharge amount is stable.
2. The method for reducing NO of gas turbine unit DLN-2.6 combustion system according to claim 1XA method of controlling emissions, characterized by: in the step 1, the DLN-2.6 combustion system of the gas turbine set is in a starting stage before 3000 revolutions at a constant speed.
3. The method for reducing NO of gas turbine unit DLN-2.6 combustion system according to claim 1XA method of controlling emissions, characterized by: in the step 2, the gas turbine set DLN-2.6 combustion system NOXThe upper limit of the discharge amount is 30mg/m3。
4. The method for reducing NO of gas turbine unit DLN-2.6 combustion system according to claim 1XA method of controlling emissions, characterized by: in the step 2, the premixing mode is that air and natural gas are mixed before entering a combustion chamber of a DLN-2.6 combustion system of the gas turbine set and are combusted in the combustion chamber.
5. The method for reducing NO of gas turbine unit DLN-2.6 combustion system according to claim 1XA method of controlling emissions, characterized by: the method for adjusting the premixing proportion in the premixing mode of the DLN-2.6 combustion system of the gas turbine unit in the step 3 comprises the following steps of,
by adjusting the mixing ratio of natural gas and air, the NO of the DLN-2.6 combustion system of the gas turbine set is adjustedXThe amount of discharge of (c).
6. The method for reducing NO of gas turbine unit DLN-2.6 combustion system according to claim 5XA method of controlling emissions, characterized by: the mixing ratio of the natural gas and the air and the NO of a DLN-2.6 combustion system of a gas turbine setXThe relationship of the discharge amount of
Y＝kx+b
Wherein Y is NO of DLN-2.6 combustion system of gas turbine unitXThe discharge amount, x is the flame temperature, b is the actual oxygen intake amount, and k is the mixing ratio of natural gas and air.
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| CN202010534601.6A CN111691985A (en) | 2020-06-12 | 2020-06-12 | Control method for reducing NOx emission of DLN-2.6 combustion system of gas turbine unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112943452A (en) * | 2021-02-23 | 2021-06-11 | 国电环境保护研究院有限公司 | Total process NO for controlling gas turbine unit to operate on gas turbine sideXSystem for discharging |
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| CN112943452A (en) * | 2021-02-23 | 2021-06-11 | 国电环境保护研究院有限公司 | Total process NO for controlling gas turbine unit to operate on gas turbine sideXSystem for discharging |
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Application publication date: 20200922 |