CN109812341A - A kind of DLN-2.6+ combustion system firing optimization method using the LVE method of operation - Google Patents
A kind of DLN-2.6+ combustion system firing optimization method using the LVE method of operation Download PDFInfo
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- CN109812341A CN109812341A CN201811650895.8A CN201811650895A CN109812341A CN 109812341 A CN109812341 A CN 109812341A CN 201811650895 A CN201811650895 A CN 201811650895A CN 109812341 A CN109812341 A CN 109812341A
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Abstract
The present invention relates to a kind of DLN-2.6+ combustion system firing optimization method using the LVE method of operation, process is as follows: adjustment gas turbine load；The combustion pressure pulsation value of the frequency range of each combustion chamber 4 in 18 combustion chambers is obtained in real time, and the maximum combustion chamber number of amplitude peak, frequency values and the amplitude for recording each frequency range；It obtains in real time and records unit emissions data；According to chamber pressure pulsation and emissions data, the combustion state of unit is judged；The fuel distribution of fuel channel is adjusted, and records chamber pressure pulsation and emissions data；Previous step is repeated, until chamber pressure pulsation or unit emissions data exceed limit value, records the boundary condition of unit operation at this time.According to boundary condition, choose the distribution of fuel channel fuel can operating range, choose the optimal value of fuel distribution；Load up is until at full capacity, repeat the above steps until chamber pressure pulsation and unit emissions data are in optimal numerical value.
Description
Technical field
The present invention relates to the analysis of DLN-2.6+ combustion system combustion state and adjustment technologies, belong to gas turbine power generation operation
And adjustment technology field.
Background technique
Totally 18 combustion chambers, each combustion chamber are equipped with fuel assembly, combustion liner cap, burning to DLN-2.6+ combustion system
Bushing, fair water sleeves and changeover portion.No. 2 and No. 3 combustion chamber configuration igniters, flame is propagated to other by flame tube interconnector after igniting
Combustion chamber, 15,16,17 and No. 18 combustion chamber configuration flame detectors.
DLN-2.6+ combustion system contains 4 fuel channels: D5, PM1, PM2 and PM3, and D5, PM2 and PM3 fuel channel are equal
It can be purged by the air that compressor is vented extraction, when certain fuel channel is not at operating status, then this channel be carried out
Purging.
On each burner fuel component, the fuel of PM1, PM2 and PM3 pipeline is divided into inside and outside two passes and enters combustion
Room is burnt, the fuel distribution between internal and external channel is controlled by orifice plate.
Using LVE (the Low Visible Emission) method of operation, the diffusion of gas turbine startup stage can be shortened
The combustion mode time enters premixed in advance, can be effectively reduced the discharge of pollutant, and the tobacco eliminated in start-up course is existing
As such as application No. is 201710311835.2 Chinese patents.
Firing optimization timely is carried out to gas turbine when annual season alternation or heating value of natural gas have variation, by combustion gas
Turbine performance and discharge index are restored to preferable level, it is ensured that the safe operation of hot-end component prolongs its service life.
Firing optimization is related to gas turbine core control system and combustion system, by the technology blockage of OEM vendor, state
Interior R&D institution, electricity power enterprise do not grasp the standard and parameter of gas turbine combustion adjustment, in-service gas turbine unit very well
Also it can not ensure that it runs in optimum point by adjust automatically, be unfavorable for effectively controlling safe condition and carry out abnormity diagnosis, divide
Analysis.
Therefore, to guarantee that gas turbine is capable of the operation of long-term safety, a kind of autonomous DLN-2.6+ combustion system is provided
Firing optimization method is necessary.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide a kind of using the operation side LVE
The DLN-2.6+ combustion system firing optimization method of formula.
Technical solution used by the present invention solves the above problems is: a kind of DLN-2.6+ combustion using the LVE method of operation
Burning system firing optimization method, which comprises the following steps:
Step 1, adjustment gas turbine load, set gas turbine load value, PM1, PM2 and PM3 fuel channel are in
Operating status then adjusts the fuel accounting in the channel PM1, PM2 and PM3；According to the numerical value of its benchmark index CRT that burns, by repairing
Change control constant to adjust the fuel accounting in the channel PM1 and PM3；
Step 2, the combustion pressure pulsation value for obtaining the frequency range of each combustion chamber 4 in 18 combustion chambers in real time, and record every
Amplitude peak, frequency values and the maximum combustion chamber number of amplitude of a frequency range；
Step 3 obtains in real time and records unit emissions data, including NOx, CO and O2；
Step 4, according to chamber pressure pulsation and emissions data, judge the combustion state of unit；
Step 5, the combustion mode according to locating for unit adjust the fuel distribution of fuel channel in conjunction with unit combustion state, and
Record chamber pressure pulsation and emissions data；
Step 6 repeats step 5, until chamber pressure pulsation or unit emissions data exceed limit value, records unit at this time
The boundary condition of operation；
Step 7, according to boundary condition, choose fuel channel fuel distribution can operating range, when comprehensive combustion adjusts
Environmental condition chooses the optimal value of fuel distribution；
If step 8, the fuel distribution for modifying fuel channel can not achieve chamber pressure pulsation or unit emissions data exists
The case where within limit value, then considers that adjusting the clear of the channel D5 blows air mass flow；
Step 9, load up are until at full capacity, repeat step 1 to 8 until chamber pressure pulsation and unit emissions data are equal
In optimal numerical value；
Step 10, unit observe chamber pressure arteries and veins from load swing is carried out to the load of modification control parameter at full capacity
The variation of dynamic and emissions data；If certain load point chamber pressure pulsation or unit emissions data transfinite, this load point again
Secondary adjustment；If data are within limit value, firing optimization terminates.
Compared with prior art, the present invention having the following advantages that and effect: the present invention passes through to using the LVE method of operation
The pulsation of DLN-2.6+ combustion system chamber pressure and the monitoring of emissions data, analysis, judge gas turbine combustion state, pass through
Adjust the fuel distribution of each operation fuel channel, the fuel air ratio of adjustment premix fuel, when certain frequency range pressure pulse value is higher or row
When putting data over run, determine that gas turbine stablizes the boundary value to burn and further chooses optimum point according to current environmental condition,
To guarantee that unit being capable of long-term safety, stable operation.
Detailed description of the invention
Fig. 1 is the DLN-2.6+ combustion-system fuel supply of the embodiment of the present invention and blows component diagram clearly.
Fig. 1 includes shut-off valve (ASV), speed ratio valve (SRV), D5 channel fuel control valve (VGC-1), PM1 channel fuel control
The fuel assemblies such as valve (VGC-2), PM2 channel fuel control valve (VGC-3) and PM3 channel fuel control valve (VGC-4) processed, D5 are logical
Road blows clearly air shut-off valve (VA-1), air shut-off valve (VA-2) is blown clearly in the channel PM2 and air shut-off valve (VA- is blown clearly in the channel PM3
Etc. 3) component is blown clearly.The fuel flow rate that respective channel is adjusted by fuel control valve is adjusted accordingly by blowing air shut-off valve clearly
Air mass flow is blown clearly in channel.
Fig. 2 is the gas turbine combustion mode switching method schematic diagram that the LVE method of operation is used in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1 to Fig. 2, a kind of DLN-2.6+ combustion system firing optimization method using the LVE method of operation, including with
Lower step:
Step 1, adjustment gas turbine load, such as gas turbine load is set as 60MW, it is now in Mode6.2 mould
Formula, PM1, PM2 and PM3 fuel channel are in operating status, then need the fuel accounting in the adjustment channel PM1, PM2 and PM3；It is fired
Burning benchmark index (CRT) is 81, then needs to account for by modification FXKSP1C [2] and FXKSP1C [3] to adjust the fuel in the channel PM1
Than adjusting the fuel accounting in the channel PM3 by modification FXKSP3C [2] and FXKSP3C [3].
Step 2, the combustion pressure pulsation value for obtaining the frequency range of each combustion chamber 4 in 18 combustion chambers in real time, and record every
The amplitude peak of a frequency range, frequency values, and record the maximum combustion chamber number of amplitude.
Step 3 obtains in real time and records unit emissions data, including NOx, CO and O2。
Step 4, according to chamber pressure pulsation and emissions data, judge the combustion state of unit.For example, 18 combustion chambers
In, CDAB frequency range amplitude maximum is 1.32psi, and CDAL frequency range amplitude maximum is 1.06psi, CDAM frequency range amplitude maximum
For 0.97psi, CDAH frequency range amplitude maximum is 0.88psi, then the pressure pulse value of 4 frequency ranges is within alarming value；NOx
And CO discharge is all satisfied country and local discharge standard, then gas turbine combustion is in good condition.
4 frequency ranges divide and its alarming value:
| Frequency range | Frequency range | Alarming value (psi) | Level-one alarms (psi) | Secondary alarm (psi) |
| CDAB | 10-30Hz | 2.0 | 4.0 | 6.0 |
| CDAL | 30-105Hz | 3.0 | 4.0 | 6.0 |
| CDAM | 105-180Hz | 3.0 | 4.0 | 6.0 |
| CDAH | 180-900Hz | 3.0 | 4.0 | 6.0 |
Step 5, the combustion mode according to locating for unit adjust the fuel distribution of fuel channel in conjunction with unit combustion state, and
Record chamber pressure pulsation and emissions data.For example, the fuel accounting in the channel PM1 is that 19.8%, CRT is in when CRT is 81
Between 80.54 and 82.5, then adjusting PM1 channel fuel accounting need to be by adjusting control constant FXKSP1C [2] and FXKSP1C [3]
It realizes, original set value is 21% and 18.5%, then adjusts so that 0.25% step-length is upper and lower simultaneously, be such as adjusted to
21.25% and 18.75%, then PM1 channel fuel accounting is adjusted to 20.5%, and record chamber pressure is pulsed and emissions data.
Step 6 repeats step 5, until chamber pressure pulsation or unit emissions data exceed limit value, records unit at this time
The boundary condition of operation.For example, when PM1 channel fuel accounting is adjusted upward to 22.3%, NO after conversionxDischarge is more than 50mg/
m3, then the PM1 channel fuel accounting recorded at this time is coboundary；When PM1 channel fuel accounting adjusts downwards to 17.8%, CDAB
Frequency range pressure fluctuation amplitude peak reaches 2.34psi, then the PM1 channel fuel accounting recorded at this time is lower boundary.
Simultaneously as NOxIt discharges too low, means that gas turbine combustion temperature is relatively low, it is possible to gas turbine be caused to put out
Fire, therefore, under Mode6.2 mode, NOxDischarge should be controlled in 20mg/m3More than, under Mode6.3 mode, NOxDischarge should control
In 15mg/m3More than.
Same method adjusts PM3 channel fuel accounting, until chamber pressure pulsation or unit emissions data are beyond limit
Value records the boundary condition of PM3 channel fuel accounting.
Step 7, according to boundary condition, choose fuel channel fuel distribution can operating range, when comprehensive combustion adjusts
Environmental condition chooses the optimal value of fuel distribution.For example, carrying out firing optimization in summer, environment temperature is higher at this time, is considered as
The fuel of influence when environment temperature reduces to gas-turbine combustion chamber pressure fluctuation and discharge, integrated operation channel distributes variation
The optimal value of this load point fuel distribution is chosen in influence to gas-turbine combustion chamber pressure fluctuation and discharge.
If step 8, the fuel distribution for modifying fuel channel can not achieve chamber pressure pulsation or unit emissions data
The case where within limit value, then considers that adjusting the clear of the channel D5 blows air mass flow.For example, under Mode6.2 mode, PM1, PM2
And PM3 fuel channel is in operating status, it is in operating status that D5 blows clearly air duct, if adjusting the channel PM1, PM3 above and below
Fuel ratio so that the pressure fluctuation peak value of CDAH frequency range is in 3psi hereinafter, then consider up and down adjustment the channel D5 it is clear
Air mass flow is blown to adjust the combustion state of gas turbine.
Step 9, load up are until at full capacity, repeat step 1 to 8 until chamber pressure pulsation and unit emissions data are equal
In optimal numerical value.
As an example, when this step is implemented, increase 90MW on the basis of 60MW load, steady load is made to exist
90MW, then by step 1 to 8 so that the chamber pressure pulsation and unit emissions data under this load point be in it is optimal
Value.Then it is further added by 30MW, makes steady load in 120MW, then by step 1 to 8, so that the burning chamber pressure under this load point
Power pulsation and unit emissions data are in optimal value, are stepped up load in this way and carry out firing optimization, until gas turbine is full
Load.
Step 10, unit observe chamber pressure arteries and veins from load swing is carried out to the load of modification control parameter at full capacity
The variation of dynamic and emissions data.If certain load point chamber pressure pulsation or unit emissions data transfinite, this load point again
Secondary adjustment；If data are within limit value, firing optimization terminates.
It is the adjustment situation example of each control constant of DLN-2.6+ combustion system in the present embodiment below, by adjusting this
A little constant values adjust unit combustion position.Including each combustion mode control constant of DLN-2.6+ combustion system, unit starting phase
Between PM1 channel fuel accounting；
PM1 channel fuel accounting under Mode3 mode after grid-connected
| Control constant | CRT | Control constant | D5 accounting [%] |
| FXKTP1N_CRT[0] | 50 | FXKSP1N[0] | 48 |
| FXKTP1N_CRT[1] | 53 | FXKSP1N[1] | 47 |
| FXKTP1N_CRT[2] | 56 | FXKSP1N[2] | 46 |
| FXKTP1N_CRT[3] | 59 | FXKSP1N[3] | 45 |
| FXKTP1N_CRT[4] | 60.84 | FXKSP1N[4] | 44 |
| FXKTP1N_CRT[5] | 62.86 | FXKSP1N[5] | 44 |
| FXKTP1N_CRT[6] | 64.82 | FXKSP1N[6] | 44 |
| FXKTP1N_CRT[7] | 66.79 | FXKSP1N[7] | 44 |
| FXKTP1N_CRT[8] | 68.69 | FXKSP1N[8] | 46 |
| FXKTP1N_CRT[9] | 70.54 | FXKSP1N[9] | 46 |
| FXKTP1N_CRT[10] | 72.5 | FXKSP1N[10] | 46 |
| FXKTP1N_CRT[11] | 74.46 | FXKSP1N[11] | 46 |
Switch to CRT when Mode6.2 mode
| Control constant | Title | Value |
| K26FXCCRT | CRT | 69.8 |
| K26FXCCRTDB | Dead zone | -1.96 |
Under Mode6.2 mode, PM1 channel fuel accounting
Under Mode6.2 mode, PM3 channel fuel accounting
Switch to CRT when Mode6.3 mode
| Control constant | Title | Value |
| K26FXBCRT | CRT | 82.5 |
| K26FXBCRTDB | Dead zone | -1.96 |
Under Mode6.3 mode, PM1 channel fuel accounting
Under Mode6.3 mode, PM3 channel fuel accounting
| Control constant | Combustion reference temperature [°F] | Control constant | PM1 accounting [%] |
| FXKTP3B_CRT[0] | 79.29 | FXKSP3B[0] | 93 |
| FXKTP3B_CRT[1] | 79.29 | FXKSP3B[1] | 93 |
| FXKTP3B_CRT[2] | 80.29 | FXKSP3B[2] | 91 |
| FXKTP3B_CRT[3] | 82.5 | FXKSP3B[3] | 89 |
| FXKTP3B_CRT[4] | 84.64 | FXKSP3B[4] | 81.5 |
| FXKTP3B_CRT[5] | 85.71 | FXKSP3B[5] | 79 |
| FXKTP3B_CRT[6] | 86.61 | FXKSP3B[6] | 76 |
| FXKTP3B_CRT[7] | 87.68 | FXKSP3B[7] | 75.4 |
| FXKTP3B_CRT[8] | 89.11 | FXKSP3B[8] | 74 |
| FXKTP3B_CRT[9] | 90.36 | FXKSP3B[9] | 71 |
| FXKTP3B_CRT[10] | 92.32 | FXKSP3B[10] | 69 |
| FXKTP3B_CRT[11] | 93.21 | FXKSP3B[11] | 66.5 |
| FXKTP3B_CRT[12] | 94.11 | FXKSP3B[12] | 66.5 |
| FXKTP3B_CRT[13] | 94.82 | FXKSP3B[13] | 64.75 |
Under Mode6.2 and Mode6.3 mode, D5 blows clearly valve opening
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (1)
1. a kind of DLN-2.6+ combustion system firing optimization method using the LVE method of operation, which is characterized in that including following step
It is rapid:
Step 1, adjustment gas turbine load, set gas turbine load value, PM1, PM2 and PM3 fuel channel are in operation
State then adjusts the fuel accounting in the channel PM1, PM2 and PM3；According to the numerical value of its benchmark index CRT that burns, controlled by modification
Constant processed adjusts the fuel accounting in the channel PM1 and PM3；
Step 2, the combustion pressure pulsation value for obtaining the frequency range of each combustion chamber 4 in 18 combustion chambers in real time, and record each frequency
Amplitude peak, frequency values and the maximum combustion chamber number of amplitude of section；
Step 3 obtains in real time and records unit emissions data, including NOx, CO and O2；
Step 4, according to chamber pressure pulsation and emissions data, judge the combustion state of unit；
Step 5, the combustion mode according to locating for unit adjust the fuel distribution of fuel channel in conjunction with unit combustion state, and record
Chamber pressure pulsation and emissions data；
Step 6 repeats step 5, until chamber pressure pulsation or unit emissions data exceed limit value, records unit operation at this time
Boundary condition；
Step 7, according to boundary condition, choose the distribution of fuel channel fuel can operating range, environment when comprehensive combustion adjusts
Condition chooses the optimal value of fuel distribution；
If step 8, the fuel distribution for modifying fuel channel can not achieve chamber pressure pulsation or unit emissions data in limit value
Within the case where, then consider to adjust the channel D5 blows air mass flow clearly；
Step 9, load up are until at full capacity, repeat step 1 to 8 until chamber pressure pulsation and unit emissions data are in
Optimal numerical value；
Step 10, unit from full capacity to modification control parameter load carry out load swing, observation chamber pressure pulsation and
Emissions data variation；If transfiniting in the pulsation of certain load point chamber pressure or unit emissions data, adjusted again in this load point
It is whole；If data are within limit value, firing optimization terminates.
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| CN111691985A (en) * | 2020-06-12 | 2020-09-22 | 国网天津市电力公司电力科学研究院 | Control method for reducing NOx emission of DLN-2.6 combustion system of gas turbine unit |
| CN114033555A (en) * | 2021-11-19 | 2022-02-11 | 华能国际电力股份有限公司 | Method for reducing yellow smoke emission time |
| CN115142960A (en) * | 2022-05-25 | 2022-10-04 | 华电电力科学研究院有限公司 | Starting method of gas turbine |
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Application publication date: 20190528 |