CN108800130B - Low-nitrogen combustion system capable of inhibiting combustion oscillation and control method thereof - Google Patents
Low-nitrogen combustion system capable of inhibiting combustion oscillation and control method thereof Download PDFInfo
- Publication number
- CN108800130B CN108800130B CN201810799761.6A CN201810799761A CN108800130B CN 108800130 B CN108800130 B CN 108800130B CN 201810799761 A CN201810799761 A CN 201810799761A CN 108800130 B CN108800130 B CN 108800130B
- Authority
- CN
- China
- Prior art keywords
- nozzle
- fuel
- control valve
- combustion
- fuel control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 121
- 230000010355 oscillation Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 16
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 8
- 239000000446 fuel Substances 0.000 claims abstract description 169
- 239000002737 fuel gas Substances 0.000 claims abstract description 40
- 230000010349 pulsation Effects 0.000 claims abstract description 32
- 239000000779 smoke Substances 0.000 claims abstract description 17
- 230000008054 signal transmission Effects 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 239000003345 natural gas Substances 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000003546 flue gas Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000203 mixture Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
-
- 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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention relates to a low-nitrogen combustion system capable of inhibiting combustion oscillation and a control method thereof, which are suitable for a premixed burner for combusting gas fuel. Combustion in a premixed combustion mode currently has the risk of damage caused by resonance generated by a combustion system. The invention comprises a fuel gas flow control main valve, a central nozzle fuel control valve, a duplex nozzle fuel control valve, a triplex nozzle fuel control valve, a control unit, a pressure pulsation sensor, a smoke component analyzer, a cyclone blade outer side throttle orifice plate, a cyclone blade inner side throttle orifice plate, a cyclone blade outer side fuel nozzle, a cyclone blade inner side fuel nozzle, a cyclone blade, a nozzle assembly, a combustion chamber shell, a flame tube, a signal transmission line and a fuel gas pipeline; the nitrogen oxide emission can be reduced, and meanwhile, stable combustion can be kept without combustion oscillation.
Description
Technical Field
The invention relates to a low-nitrogen combustion system capable of inhibiting combustion oscillation and a control method thereof, which are suitable for a premixed burner for combusting gas fuel.
Background
Because of the requirement of environmental protection, the country has made the highest limit requirement on the emission of nitrogen oxides of the combustion device for burning natural gas, the mainstream technology at present is to burn by adopting a premixed combustion mode, namely, after fuel and air are mixed, the mixed fuel and air are sent into a combustion chamber to burn, so that the local high temperature of combustion is reduced to reduce the generation of nitrogen oxides, for example, the Chinese patent with the application number of 201710600180.0, but the premixed combustion mode has a narrow stable combustion window, combustion oscillation phenomenon can occur near the flameout limit to cause flameout, in addition, the fluctuation of fuel flow or air can also cause the combustion pressure pulsation value of a certain frequency band to rise, and once the frequency coincides with the natural frequency of the burner, the resonance of the combustion system can be damaged, and the design method of the patent can avoid the occurrence of the problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a low-nitrogen combustion system which is reasonable in design and can inhibit combustion oscillation and a control method thereof, and the low-nitrogen combustion system can reduce emission of nitrogen oxides and simultaneously maintain stable combustion without combustion oscillation.
The invention solves the problems by adopting the following technical scheme: the low-nitrogen combustion system capable of suppressing combustion oscillation is characterized by comprising a fuel gas flow control main valve, a central nozzle fuel control valve, a duplex nozzle fuel control valve, a triplex nozzle fuel control valve, a control unit, a pressure pulsation sensor, a smoke component analyzer, a cyclone vane outer throttle orifice plate, a cyclone vane inner throttle orifice plate, a cyclone vane outer fuel nozzle, a cyclone vane inner fuel nozzle, a cyclone vane, a nozzle assembly, a combustion chamber shell, a flame tube, a signal transmission line and a fuel gas pipeline; the fuel gas pipeline is communicated with the nozzle assembly, and a fuel gas flow control main valve is arranged between the fuel gas pipeline and the nozzle assembly; the nozzle assembly comprises a central nozzle, a duplex nozzle and a triple nozzle, a central nozzle fuel control valve is arranged between the fuel gas pipeline and the central nozzle, a duplex nozzle fuel control valve is arranged between the fuel gas pipeline and the duplex nozzle, and a triple nozzle fuel control valve is arranged between the fuel gas pipeline and the triple nozzle; the nozzle assembly is communicated with the flame tube, and a combustion chamber shell is arranged outside the flame tube; the pressure pulsation sensor and the smoke component analyzer are connected with the flame tube, and are connected with the control unit through signal transmission lines, and the control unit is respectively connected with the central nozzle fuel control valve, the duplex nozzle fuel control valve and the triple nozzle fuel control valve; the nozzle assembly is provided with a swirler vane outside fuel nozzle, a swirler vane inside fuel nozzle and a swirler vane, wherein the swirler vane outside fuel nozzle is arranged on the outer side of the swirler vane, the swirler vane inside fuel nozzle is arranged on the inner side of the swirler vane, the swirler vane outside fuel nozzle is provided with a swirler vane outside throttle plate, and the swirler vane inside fuel nozzle is provided with a swirler vane inside throttle plate.
Further, the burner is provided with a plurality of nozzles, the different nozzles are divided into a plurality of groups, and each group of nozzles shares one fuel; the central nozzle fuel control valve controls the fuel supply of the central nozzle, the double-nozzle fuel control valve controls the fuel supply of the double-nozzle, and the triple-nozzle fuel control valve controls the fuel supply of the triple-nozzle; the nozzles controlled by the same fuel are uniformly distributed in the circumferential direction.
Further, the burner has a number of nozzles, the diameter of the central nozzle being the smallest, the diameter of the central nozzle being 0.4-0.6 times the flow area of the other fuel nozzles.
A control method of the low-nitrogen combustion system capable of inhibiting combustion oscillation as described above, characterized by comprising the following steps: natural gas flows through a fuel gas pipeline and a fuel gas flow control total valve, wherein the valve is used for controlling the total flow of the fuel gas, and then the natural gas enters three groups of combustors through a central nozzle fuel control valve, a dual nozzle fuel control valve and a triple nozzle fuel control valve respectively; air passes through the nozzle assembly from a channel between the combustion chamber shell and the flame tube, is mixed with natural gas and then enters the flame tube for combustion; the pressure pulsation sensor and the smoke component analyzer respectively collect combustion pulsation values and emission values in the combustion process, the combustion pulsation values and the emission values are transmitted to the control unit through the signal transmission line, and once abnormal combustion parameters occur, the control unit can finely adjust the opening degree of the central nozzle fuel control valve, the double nozzle fuel control valve and/or the triple nozzle fuel control valve to ensure that the combustion is recovered to be normal.
Furthermore, different combustion modes are realized by opening different numbers of combustion nozzles, so as to control the combustion load to change from low to high, and the central nozzle is opened in the whole combustion process to maintain stable combustion. For example, when the central nozzle is started, the central nozzle and the duplex nozzle are started when the load is below 20%, when the load is between 20% and 50%, the central nozzle and the triplex nozzle are started, and when the load is above 50%, all the nozzles are started.
Further, in order to suppress combustion oscillation, attenuate the amplitude of resonance, the opening degree of each fuel control valve is controlled so that the local equivalence ratio in the vicinity of the nozzle outlet controlled by a different fuel control valve is different in each combustion mode; in each combustion mode, the opening of the central nozzle fuel control valve gradually decreases along with the increase of the opening of the gas flow control total fuel gas flow control valve, and the opening of the dual-nozzle fuel control valve or the triple-nozzle fuel control valve continuously increases.
Further, in either combustion mode, the highest central nozzle outlet equivalence ratio and the lowest dual nozzle outlet equivalence ratio are ensured by adjusting the central nozzle fuel control valve, the dual nozzle fuel control valve and/or the triple nozzle fuel control valve.
Further, when the pressure pulsation sensor detects that the pulsation amplitude of a certain frequency band in the combustion chamber is greatly increased, the control unit automatically adjusts the opening degree of the central nozzle fuel control valve, the duplex nozzle fuel control valve and/or the triple nozzle fuel control valve, and finally, the combustion pressure pulsation value is restored to be normal. For example, during the combustion system adjustment process, the fuel flow rate of the central nozzle is ensured to be not less than 1.2 times of the minimum flameout fuel flow rate, so that the central nozzle is always in a relatively stable combustion state, the opening of other header fuel control valves is increased in steps of every 0.5%, and the maximum adjustment amplitude is not more than 10%. Until the combustion chamber pressure pulsation value falls below the alarm value.
Further, when the smoke gas component analyzer detects that NOx in the smoke gas is increased, the control unit automatically adjusts the opening degree of the central nozzle fuel control valve, the duplex nozzle fuel control valve and/or the triplex nozzle fuel control valve, and finally, the NOx emission is restored to a normal value. For example, during the combustion system adjustment process, the fuel flow rate of the central nozzle is ensured to be not less than 1.2 times of the minimum flameout fuel flow rate, so that the central nozzle is always in a relatively stable combustion state, the opening of other header fuel control valves is reduced in steps of every 0.5%, and the maximum adjustment amplitude is not more than 10%. Until the NOx content in the flue gas decreases below normal.
Further, the fuel flow rates of the fuel nozzle on the outer side of the cyclone blade and the fuel nozzle on the inner side of the cyclone blade are respectively regulated through the throttle orifice plate on the outer side of the cyclone blade and the throttle orifice plate on the inner side of the cyclone blade; when the adjustment method of the control unit is ineffective, the adjustment is performed by changing the apertures of the swirl vane outer side orifice plate and the swirl vane inner side orifice plate.
Compared with the prior art, the invention has the following advantages and effects:
(1) The staged combustion technology is adopted to flexibly control the load, so that the equivalent ratio near each burner is controlled in a comparatively ideal range, the combustion stability is improved, and the emission is reduced.
(2) By adopting the asymmetric combustion technology, the combustion intensity of each group of combustors is different, so that the condition that the amplitude of the combustion pulsation in the same frequency band is overlarge is avoided, and the system resonance risk is reduced.
(3) The combustion system is preprogrammed and has an automatic adjustment function, so that the phenomenon of overlarge combustion pressure pulsation caused by the change of the fuel calorific value or the combustion air temperature can be reduced or avoided.
Drawings
FIG. 1 is a schematic diagram of a low nitrogen combustion system capable of suppressing combustion oscillations in an embodiment of the present invention.
FIG. 2 is a schematic view of a partial structure of a nozzle assembly according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the structure of nozzle groupings in an embodiment of the present invention.
In the figure: the fuel gas flow control main valve 1, the central nozzle fuel control valve 2, the double nozzle fuel control valve 3, the triple nozzle fuel control valve 4, the control unit 5, the pressure pulsation sensor 6, the smoke composition analyzer 7, the swirler vane outer throttle plate 8, the swirler vane inner throttle plate 9, the swirler vane outer fuel nozzle 10, the swirler vane inner fuel nozzle 11, the swirler vane 12, the nozzle assembly 13, the combustion chamber housing 14, the flame tube 15, the signal transmission line 16, the fuel gas pipeline 17, the central nozzle 131, the double nozzle 132, and the triple nozzle 133.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1 to 3, the low nitrogen combustion system capable of suppressing combustion shock in the present embodiment includes a fuel gas flow control main valve 1, a central nozzle fuel control valve 2, a twin nozzle fuel control valve 3, a triple nozzle fuel control valve 4, a control unit 5, a pressure pulsation sensor 6, a smoke composition analyzer 7, a swirler vane outer throttle plate 8, a swirler vane inner throttle plate 9, a swirler vane outer fuel nozzle 10, a swirler vane inner fuel nozzle 11, a swirler vane 12, a nozzle assembly 13, a combustion chamber housing 14, a flame tube 15, a signal transmission line 16, and a fuel gas pipe 17; the fuel gas pipeline 17 is communicated with the nozzle assembly 13, and a fuel gas flow control main valve 1 is arranged between the fuel gas pipeline 17 and the nozzle assembly 13; the nozzle assembly 13 comprises a central nozzle 131, a duplex nozzle 132 and a triple nozzle 133, a central nozzle fuel control valve 2 is arranged between the fuel gas pipeline 17 and the central nozzle 131, a duplex nozzle fuel control valve 3 is arranged between the fuel gas pipeline 17 and the duplex nozzle 132, and a triple nozzle fuel control valve 4 is arranged between the fuel gas pipeline 17 and the triple nozzle 133; the nozzle assembly 13 is communicated with the flame tube 15, and a combustion chamber shell 14 is arranged outside the flame tube 15; the pressure pulsation sensor 6 and the smoke composition analyzer 7 are connected with the flame tube 15, the pressure pulsation sensor 6 and the smoke composition analyzer 7 are connected with the control unit 5 through the signal transmission line 16, and the control unit 5 is respectively connected with the central nozzle fuel control valve 2, the duplex nozzle fuel control valve 3 and the triple nozzle fuel control valve 4; the nozzle assembly 13 is provided with a swirler vane outer fuel nozzle 10, a swirler vane inner fuel nozzle 11 and a swirler vane 12, the swirler vane outer fuel nozzle 10 being arranged outside the swirler vane 12, the swirler vane inner fuel nozzle 11 being arranged inside the swirler vane 12, the swirler vane outer fuel nozzle 10 being provided with a swirler vane outer orifice plate 8, the swirler vane inner fuel nozzle 11 being provided with a swirler vane inner orifice plate 9.
In this embodiment, the burner has a plurality of nozzles, the different number of nozzles being divided into a plurality of groups, each group of nozzles sharing a fuel; the central nozzle fuel control valve 2 controls the fuel supply of the central nozzle 131, the double nozzle fuel control valve 3 controls the fuel supply of the double nozzle 132, and the triple nozzle fuel control valve 4 controls the fuel supply of the triple nozzle 133; the nozzles controlled by the same fuel are uniformly distributed in the circumferential direction.
In this embodiment, the burner has several nozzles, with the smallest diameter of the central nozzle 131, and the diameter of the central nozzle 131 is 0.4-0.6 times the flow area of the other fuel nozzles.
The control method of the low-nitrogen combustion system capable of inhibiting combustion oscillation comprises the following steps: natural gas flows through the fuel gas pipeline 17 and flows through the fuel gas flow control total valve 1, the valve is used for controlling the total flow of the fuel gas, and then the natural gas enters the three groups of burners respectively through the central nozzle fuel control valve 2, the double nozzle fuel control valve 3 and the triple nozzle fuel control valve 4; air passes through the nozzle assembly 13 from a channel between the combustion chamber shell 14 and the flame tube 15, is mixed with natural gas and then enters the flame tube 15 for combustion; the pressure pulsation sensor 6 and the smoke component analyzer 7 respectively collect combustion pulsation values and emission values in the combustion process, the combustion pulsation values and the emission values are transmitted to the control unit 5 through the signal transmission line 16, and once abnormal combustion parameters occur, the control unit 5 can finely adjust the opening degrees of the central nozzle fuel control valve 2, the duplex nozzle fuel control valve 3 and/or the triple nozzle fuel control valve 4 to ensure that the combustion is recovered to be normal.
The control method of the low-nitrogen combustion system capable of inhibiting combustion oscillation comprises the following steps:
by opening different numbers of combustion nozzles, different combustion modes are realized for controlling the combustion load to change from low to high, and the central nozzle 131 is opened in the whole process of combustion for maintaining stable combustion.
In order to restrain combustion oscillation, weaken the amplitude of resonance, control the opening degree of each fuel control valve, make the local equivalence ratio near the nozzle outlet controlled by different fuel control valves in each combustion mode different; in each combustion mode, the opening of the central nozzle fuel control valve 2 gradually decreases as the opening of the gas flow control fuel gas flow control total valve 1 increases, and the opening of the dual nozzle fuel control valve 3 or the triple nozzle fuel control valve 4 continuously increases.
In either combustion mode, the highest equivalent ratio of the outlets of the central nozzle 131, the second equivalent ratio of the outlets of the triple nozzle 133, and the lowest equivalent ratio of the outlets of the double nozzle 132 are ensured by adjusting the central nozzle fuel control valve 2, the double nozzle fuel control valve 3, and/or the triple nozzle fuel control valve 4.
When the pressure pulsation sensor 6 detects that the pulsation amplitude of a certain frequency band in the combustion chamber is greatly increased, the control unit 5 automatically adjusts the opening degree of the central nozzle fuel control valve 2, the duplex nozzle fuel control valve 3 and/or the triplex nozzle fuel control valve 4, and finally, the combustion pressure pulsation value is restored to be normal.
When the smoke composition analyzer 7 detects that the NOx in the smoke is increased, the control unit 5 automatically adjusts the opening degree of the central nozzle fuel control valve 2, the duplex nozzle fuel control valve 3 and/or the triplex nozzle fuel control valve 4, and finally the NOx emission is restored to the normal value.
The fuel flow rates of the swirler vane outer side fuel nozzle 10 and the swirler vane inner side fuel nozzle 11 are respectively regulated by the swirler vane outer side throttle plate 8 and the swirler vane inner side throttle plate 9; when the adjustment method of the control unit 5 is not effective, the adjustment is performed by changing the apertures of the swirler vane outer throttle plate 8 and the swirler vane inner throttle plate 9.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (3)
1. The control method of the low-nitrogen combustion system capable of inhibiting combustion oscillation is characterized in that the low-nitrogen combustion system comprises a fuel gas flow control main valve (1), a central nozzle fuel control valve (2), a duplex nozzle fuel control valve (3), a triplex nozzle fuel control valve (4), a control unit (5), a pressure pulsation sensor (6), a smoke component analyzer (7), a cyclone vane outer side throttle plate (8), a cyclone vane inner side throttle plate (9), a cyclone vane outer side fuel nozzle (10), a cyclone vane inner side fuel nozzle (11), a cyclone vane (12), a nozzle assembly (13), a combustion chamber shell (14), a flame tube (15), a signal transmission line (16) and a fuel gas pipeline (17); the fuel gas pipeline (17) is communicated with the nozzle assembly (13), and a fuel gas flow control main valve (1) is arranged between the fuel gas pipeline (17) and the nozzle assembly (13); the nozzle assembly (13) comprises a central nozzle (131), a duplex nozzle (132) and a triple nozzle (133), a central nozzle fuel control valve (2) is arranged between the fuel gas pipeline (17) and the central nozzle (131), a duplex nozzle fuel control valve (3) is arranged between the fuel gas pipeline (17) and the duplex nozzle (132), and a triple nozzle fuel control valve (4) is arranged between the fuel gas pipeline (17) and the triple nozzle (133); the nozzle assembly (13) is communicated with the flame tube (15), and a combustion chamber shell (14) is arranged outside the flame tube (15); the pressure pulsation sensor (6) and the smoke component analyzer (7) are connected with the flame tube (15), the pressure pulsation sensor (6) and the smoke component analyzer (7) are connected with the control unit (5) through signal transmission lines (16), and the control unit (5) is respectively connected with the central nozzle fuel control valve (2), the duplex nozzle fuel control valve (3) and the triple nozzle fuel control valve (4); the nozzle assembly (13) is provided with a swirler vane outer side fuel nozzle (10), a swirler vane inner side fuel nozzle (11) and a swirler vane (12), the swirler vane outer side fuel nozzle (10) is arranged on the outer side of the swirler vane (12), the swirler vane inner side fuel nozzle (11) is arranged on the inner side of the swirler vane (12), the swirler vane outer side fuel nozzle (10) is provided with a swirler vane outer side throttling orifice plate (8), and the swirler vane inner side fuel nozzle (11) is provided with a swirler vane inner side throttling orifice plate (9); the burner is provided with a plurality of nozzles, the different nozzles are divided into a plurality of groups, and each group of nozzles shares one fuel; the central nozzle fuel control valve (2) controls the fuel supply of the central nozzle (131), the double nozzle fuel control valve (3) controls the fuel supply of the double nozzle (132), and the triple nozzle fuel control valve (4) controls the fuel supply of the triple nozzle (133); the nozzles controlled by the same fuel are uniformly distributed in the circumferential direction; the burner has a number of nozzles, the diameter of the central nozzle (131) being the smallest, the diameter of the central nozzle (131) being 0.4-0.6 times the flow area of the other fuel nozzles;
natural gas flows through a fuel gas pipeline (17) and flows through a fuel gas flow control total valve (1) which is used for controlling the total flow of the fuel gas, and then the natural gas enters three groups of combustors through a central nozzle fuel control valve (2), a duplex nozzle fuel control valve (3) and a triplex nozzle fuel control valve (4) respectively; air passes through the nozzle assembly (13) from a channel between the combustion chamber shell (14) and the flame tube (15), is mixed with natural gas and then enters the flame tube (15) for combustion; the pressure pulsation sensor (6) and the smoke component analyzer (7) respectively collect combustion pulsation values and emission values in the combustion process, the combustion pulsation values and the emission values are transmitted to the control unit (5) through the signal transmission line (16), and once abnormal combustion parameters occur, the control unit (5) can finely adjust the opening degrees of the central nozzle fuel control valve (2), the duplex nozzle fuel control valve (3) and/or the triple nozzle fuel control valve (4) to ensure that the combustion is recovered to be normal;
different combustion modes are realized by opening different numbers of combustion nozzles, so as to control the combustion load to change from low to high, and the central nozzle (131) is opened in the whole combustion process to maintain stable combustion;
in order to restrain combustion oscillation, weaken the amplitude of resonance, control the opening degree of each fuel control valve, make the local equivalence ratio near the nozzle outlet controlled by different fuel control valves in each combustion mode different; in each combustion mode, the opening of the central nozzle fuel control valve (2) is gradually reduced along with the increase of the opening of the gas flow control fuel gas flow control total valve (1), and the opening of the duplex nozzle fuel control valve (3) or the triple nozzle fuel control valve (4) is continuously increased;
in any combustion mode, the highest equivalent ratio of the outlet of the central nozzle (131) and the lowest equivalent ratio of the outlet of the triple nozzle (133) are ensured by adjusting the central nozzle fuel control valve (2), the double nozzle fuel control valve (3) and/or the triple nozzle fuel control valve (4);
the fuel flow rates of the fuel nozzle (10) on the outer side of the cyclone blade and the fuel nozzle (11) on the inner side of the cyclone blade are respectively regulated by the throttle orifice plate (8) on the outer side of the cyclone blade and the throttle orifice plate (9) on the inner side of the cyclone blade; when the adjustment method of the control unit (5) is not effective, the adjustment is performed by changing the apertures of the swirl vane outer orifice plate (8) and the swirl vane inner orifice plate (9).
2. The control method of a low-nitrogen combustion system capable of suppressing combustion oscillation according to claim 1, wherein when the pressure pulsation sensor (6) detects that the pulsation amplitude of a certain frequency band in the combustion chamber is greatly increased, the control unit (5) automatically adjusts the opening degree of the central nozzle fuel control valve (2), the duplex nozzle fuel control valve (3) and/or the triple nozzle fuel control valve (4), and finally, the combustion pressure pulsation value is restored to be normal.
3. The control method of a low-nitrogen combustion system capable of suppressing combustion oscillations according to claim 1, characterized in that when the flue gas component analyzer (7) detects an increase in NOx in the flue gas, the control unit (5) automatically adjusts the opening of the central nozzle fuel control valve (2), the dual nozzle fuel control valve (3) and/or the triple nozzle fuel control valve (4) to finally restore the NOx emission to a normal value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810799761.6A CN108800130B (en) | 2018-07-20 | 2018-07-20 | Low-nitrogen combustion system capable of inhibiting combustion oscillation and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810799761.6A CN108800130B (en) | 2018-07-20 | 2018-07-20 | Low-nitrogen combustion system capable of inhibiting combustion oscillation and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108800130A CN108800130A (en) | 2018-11-13 |
| CN108800130B true CN108800130B (en) | 2023-11-28 |
Family
ID=64077706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810799761.6A Active CN108800130B (en) | 2018-07-20 | 2018-07-20 | Low-nitrogen combustion system capable of inhibiting combustion oscillation and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108800130B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109812341A (en) * | 2018-12-31 | 2019-05-28 | 华电电力科学研究院有限公司 | A kind of DLN-2.6+ combustion system firing optimization method using the LVE method of operation |
| CN110645103B (en) * | 2019-09-11 | 2021-01-29 | 上海和兰透平动力技术有限公司 | Gas turbine on-duty gas inlet flow control system |
| JP7262364B2 (en) * | 2019-10-17 | 2023-04-21 | 三菱重工業株式会社 | gas turbine combustor |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1244645A (en) * | 1998-05-29 | 2000-02-16 | 联合工艺公司 | Method and device for gas burner |
| CN101344037A (en) * | 2003-11-10 | 2009-01-14 | 通用电气公司 | Method and apparatus for actuating fuel trim valves in a gas turbine |
| CN101360900A (en) * | 2006-01-19 | 2009-02-04 | 西门子公司 | Fuel ratio control in a combustion apparatus with multiple fuel supply lines |
| CN201652349U (en) * | 2010-04-02 | 2010-11-24 | 北京京诚凤凰工业炉工程技术有限公司 | Double-gas fuel burner |
| CN102144131A (en) * | 2008-09-08 | 2011-08-03 | 西门子能源公司 | Method and system for controlling fuel to a dual stage nozzle |
| CN102635861A (en) * | 2011-02-11 | 2012-08-15 | 通用电气公司 | System and method for operating a combustor |
| CN103063703A (en) * | 2012-12-26 | 2013-04-24 | 华北电力大学 | Experimental method and apparatus for realizing low-NOX stable combustion of gaseous fuel |
| CN103528090A (en) * | 2013-10-09 | 2014-01-22 | 清华大学 | Combustion system and combustion oscillation suppression system |
| CN104896512A (en) * | 2015-05-11 | 2015-09-09 | 北京航空航天大学 | Low-emission natural gas combustion chamber with wide stable working range |
| CN208794408U (en) * | 2018-07-20 | 2019-04-26 | 华电电力科学研究院有限公司 | A kind of low nitrogen burning system can inhibit burning concussion |
-
2018
- 2018-07-20 CN CN201810799761.6A patent/CN108800130B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1244645A (en) * | 1998-05-29 | 2000-02-16 | 联合工艺公司 | Method and device for gas burner |
| CN101344037A (en) * | 2003-11-10 | 2009-01-14 | 通用电气公司 | Method and apparatus for actuating fuel trim valves in a gas turbine |
| CN101360900A (en) * | 2006-01-19 | 2009-02-04 | 西门子公司 | Fuel ratio control in a combustion apparatus with multiple fuel supply lines |
| CN102144131A (en) * | 2008-09-08 | 2011-08-03 | 西门子能源公司 | Method and system for controlling fuel to a dual stage nozzle |
| CN201652349U (en) * | 2010-04-02 | 2010-11-24 | 北京京诚凤凰工业炉工程技术有限公司 | Double-gas fuel burner |
| CN102635861A (en) * | 2011-02-11 | 2012-08-15 | 通用电气公司 | System and method for operating a combustor |
| CN103063703A (en) * | 2012-12-26 | 2013-04-24 | 华北电力大学 | Experimental method and apparatus for realizing low-NOX stable combustion of gaseous fuel |
| CN103528090A (en) * | 2013-10-09 | 2014-01-22 | 清华大学 | Combustion system and combustion oscillation suppression system |
| CN104896512A (en) * | 2015-05-11 | 2015-09-09 | 北京航空航天大学 | Low-emission natural gas combustion chamber with wide stable working range |
| CN208794408U (en) * | 2018-07-20 | 2019-04-26 | 华电电力科学研究院有限公司 | A kind of low nitrogen burning system can inhibit burning concussion |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108800130A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108800130B (en) | Low-nitrogen combustion system capable of inhibiting combustion oscillation and control method thereof | |
| US9677759B2 (en) | Premix gas burner | |
| US7878799B2 (en) | Multiple burner arrangement for operating a combustion chamber, and method for operating the multiple burner arrangement | |
| US8434311B2 (en) | System for controlling a combustion process for a gas turbine | |
| CA2291374C (en) | A dual fuel nozzle | |
| US5899074A (en) | Gas turbine combustor and operation method thereof for a diffussion burner and surrounding premixing burners separated by a partition | |
| US20010047650A1 (en) | Method of operating a gas-turbine chamber with gaseous fuel | |
| US20020043067A1 (en) | Gas turbine combustion system and combustion control method therefor | |
| US20120144832A1 (en) | Passive air-fuel mixing prechamber | |
| CN112594735B (en) | Gas turbine combustor | |
| US20140007582A1 (en) | Gas Turbine Combustor and Operating Method for Gas Turbine Combustor | |
| CN110285447B (en) | Low-emission combustion chamber of gas turbine and variable-load air distribution and adjustment method | |
| JP7149909B2 (en) | gas turbine combustor | |
| JP4103722B2 (en) | Multistage tubular flame burner and its combustion control method | |
| CN208794408U (en) | A kind of low nitrogen burning system can inhibit burning concussion | |
| CN215909094U (en) | Constant power low nitrogen oxide igniting gun | |
| CN113654082B (en) | Constant-power low-nitrogen oxide ignition gun and use method thereof | |
| US11493206B2 (en) | Gas turbine combustor having main fuel valves independently adjustable | |
| CN105526588A (en) | Fuel gas swirling low-nitrogen burner of steam-injection boiler | |
| US11187408B2 (en) | Apparatus and method for variable mode mixing of combustion reactants | |
| WO2015067482A1 (en) | Gas turbine burner having separately controllable fuel stages in pilot burner swirl vanes | |
| RU2687545C1 (en) | Low-emission combustion chamber and method of feeding fuel therein | |
| JP5464376B2 (en) | Combustor, gas turbine, and fuel control method for combustor | |
| CN110440287A (en) | A kind of flow adjusting sleeve | |
| CN215951408U (en) | Burner with super-high power and capable of being started and cut off rapidly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |