CN109058994B - Analysis system and analysis method for fuel axial staged premixed combustion characteristics - Google Patents
Analysis system and analysis method for fuel axial staged premixed combustion characteristics Download PDFInfo
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- CN109058994B CN109058994B CN201810993273.9A CN201810993273A CN109058994B CN 109058994 B CN109058994 B CN 109058994B CN 201810993273 A CN201810993273 A CN 201810993273A CN 109058994 B CN109058994 B CN 109058994B
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- 239000000446 fuel Substances 0.000 title claims abstract description 279
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 126
- 238000004458 analytical method Methods 0.000 title claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 16
- 239000003344 environmental pollutant Substances 0.000 claims description 14
- 231100000719 pollutant Toxicity 0.000 claims description 14
- 238000002309 gasification Methods 0.000 claims description 12
- 238000003032 molecular docking Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 8
- 239000003546 flue gas Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 10
- 238000012795 verification Methods 0.000 abstract description 4
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000004141 dimensional analysis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D99/00—Subject matter not provided for in other groups of this subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2208/00—Control devices associated with burners
-
- 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 discloses an analysis system and an analysis method for fuel axial grading premixed combustion characteristics. Therefore, the on-site verification is not needed, and the research cost of axial staged premixed combustion is reduced. In addition, the analysis system of the fuel axial grading premixing combustion characteristics can analyze different fuels, and has wide application range. The analysis system of the invention can be used for analyzing not only the axial staged premixed combustion characteristics of the liquid fuel, but also the axial staged premixed combustion characteristics of the liquid fuel-gas fuel.
Description
Technical Field
The invention relates to the technical field of fuel combustion characteristic analysis, in particular to an analysis system and an analysis method for fuel axial staged premixed combustion characteristics.
Background
The axial staged combustion technology has been widely applied to gas turbines, has obvious effects in load range adjustment and emission reduction through field verification, and can be found from the fuel combustion chamber structure of the current axial staged technology, manufacturers pay great attention to the axial staged blending and the determination of the optimal secondary fuel/air distribution ratio and residence time, and the axial staged combustion characteristics are greatly influenced. However, the study of the axial staged combustion characteristics can only be performed on site, and the study cost is high.
Therefore, how to reduce the research cost of axial staged premixed combustion is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is how to reduce the research cost of axial staged premixed combustion, and therefore, the invention provides an analysis system and an analysis method for fuel axial staged premixed combustion characteristics.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an analysis system for fuel axial staged premixed combustion characteristics, comprising:
a first fuel inlet for introducing liquid fuel;
an air inlet for introducing air;
an axial staged combustor having a primary combustion zone and a secondary combustion zone;
a first primary fuel supply pipe in communication with the primary injection assembly of the primary combustion zone;
a first secondary fuel supply pipe in communication with the secondary injection assembly of the secondary combustion zone;
a fuel distributor communicating the first fuel inlet with the first primary fuel supply pipe and the first secondary fuel supply pipe, the fuel distributor being capable of regulating a first primary fuel flow into the first primary fuel supply pipe and a first secondary fuel flow into the first secondary fuel supply pipe;
a primary air supply duct in communication with the air inlet of the primary combustion zone;
a secondary air supply pipe in communication with the first secondary fuel supply pipe;
an air distributor communicating the air inlet with the primary air supply pipe and the secondary air supply pipe, the air distributor being capable of regulating a primary air flow rate into the primary air supply pipe and a secondary air flow rate into the secondary air supply pipe;
a flue gas detector for detecting the content of pollutants in the flue gas discharged by the axial staged burner;
the flame acquisition instrument is used for acquiring a main combustion flame image of the main combustion zone and a secondary combustion flame image of the secondary combustion zone; and
a controller that receives operating condition parameters, and controls the air distributor and the fuel distributor according to the operating condition parameters to adjust the primary air flow, the secondary air flow, the first primary fuel flow, and the first secondary fuel flow to be within corresponding first thresholds; and obtaining the corresponding pollutant content, the main combustion flame image and the secondary combustion flame image under the working condition parameters.
Preferably, in the above analysis system for fuel axial staged premixed combustion characteristics, the analysis system further comprises:
a gasifier disposed between the first fuel access end and the fuel dispenser;
a second fuel inlet for introducing gaseous fuel;
a second stage fuel supply pipe in communication with the first stage fuel supply pipe;
a second secondary fuel supply pipe in communication with the first secondary fuel supply pipe;
a fuel distributor communicating the second fuel access end with the second primary fuel supply pipe and the second secondary fuel supply pipe, the fuel distributor being capable of regulating a second primary fuel flow into the second primary fuel supply pipe and a second secondary fuel flow into the second secondary fuel supply pipe;
and the controller controls the fuel distributor according to the working condition parameters so as to adjust the second-stage fuel flow and the second-stage fuel flow to be within corresponding second thresholds.
Preferably, in the above analysis system of fuel axial staged premixed combustion characteristics, the gasifier includes:
a gasification tank;
the gasification pipe is communicated with the first fuel access end and is arranged inside the gasification tank; and
a preheater for heating the oil bath in the gasification tank.
Preferably, in the above analysis system of fuel axial staged premixed combustion characteristics, the fuel dispenser includes a first mass flow controller provided on the first primary fuel supply pipe and a second mass flow controller provided on the first secondary fuel supply pipe.
Preferably, in the above analysis system for fuel axial staged premixed combustion characteristics, the fuel dispenser further comprises a fifth mass flow controller provided on the second primary fuel supply pipe and a sixth mass flow controller provided on the second secondary fuel supply pipe.
Preferably, in the analysis system of fuel axial staged premixed combustion characteristics, the fifth mass flow controller is a seventh mass flow controller arranged in parallel, wherein the range of the seventh mass flow controller is 0-37.5SLM.
Preferably, in the above analysis system for fuel axial staged premixed combustion characteristics, the air distributor includes a third mass flow controller provided on the primary air supply pipe and a fourth mass flow controller provided on the secondary air supply pipe.
Preferably, in the above analysis system for fuel axial staged premixed combustion characteristics, the first fuel inlet is further provided with a first switching valve, the first primary fuel supply pipe is provided with a second switching valve, the first secondary fuel supply pipe is provided with a third switching valve, and the air inlet is further provided with a fourth switching valve.
Preferably, in the analysis system of fuel axial staged premixed combustion characteristics, the secondary injection assembly comprises four nozzles, the working condition parameters further comprise the opening number of the nozzles, and the secondary injection assembly determines the opening or closing of the nozzles according to the working condition parameters.
Preferably, in the above analysis system for fuel axial staged premixed combustion characteristics, the diameter of the nozzles is 1mm or 2mm, and four of the nozzles are arranged to intersect.
The invention also discloses an analysis method of the fuel axial staged premixed combustion characteristics, which comprises the following steps:
docking the fuel with the first fuel access terminal;
docking air with the air access terminal;
setting working condition parameters;
receiving a working condition parameter, and controlling the air distributor and the fuel distributor according to the working condition parameter so as to adjust the primary air flow rate, the secondary air flow rate, the first primary fuel flow rate and the first secondary fuel flow rate to be within corresponding first thresholds; and obtaining the corresponding pollutant content, the main combustion flame image and the secondary combustion flame image under the working condition parameters.
Preferably, the method of analyzing fuel axial staged premixed combustion characteristics further comprises:
docking the fuel with a second fuel access terminal;
and controlling the fuel distributor according to the working condition parameters so as to adjust the second-stage fuel flow and the second-stage fuel flow to be within corresponding second thresholds.
Preferably, the analysis method of the fuel axial staged premixed combustion characteristics includes: total equivalence ratio, secondary equivalence ratio, and secondary duty ratio; the contaminant content includes NO X Content and CO content.
According to the technical scheme, the analysis system of the fuel axial grading premixed combustion characteristic can obtain pollutant content, a main combustion flame image and a secondary combustion flame image under different working condition parameters, so that the axial grading premixed combustion characteristic is obtained. Therefore, the on-site verification is not needed, and the research cost of axial staged premixed combustion is reduced. In addition, the analysis system of the fuel axial grading premixing combustion characteristics can analyze different fuels, and has wide application range.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics according to yet another embodiment of the invention;
FIG. 4 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics according to yet another embodiment of the invention;
FIG. 5 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics in accordance with an embodiment of the invention;
FIG. 6 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics in accordance with an embodiment of the invention;
FIG. 7 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics in accordance with an embodiment of the invention;
FIG. 8 is a schematic diagram of an analysis system for fuel axial staged premixed combustion characteristics according to an embodiment of the invention.
In the figure, 101 is a first fuel inlet, 102 is a first primary fuel supply pipe, 103 is a first secondary fuel supply pipe, 104 is an air inlet, 105 is a primary air supply pipe, 106 is a secondary air supply pipe, 107 is a second fuel inlet, 108 is a second primary fuel supply pipe, 109 is a second secondary fuel supply pipe, 200 is an axially staged combustor, 300 is a fuel distributor, 301 is a first mass flow controller, 302 is a second mass flow controller, 303 is a fifth mass flow controller, 304 is a sixth mass flow controller, 304 is a seventh mass flow controller, 400 is a gasifier, 500 is an air distributor, 501 is a third mass flow controller, 502 is a fourth mass flow controller, 600 is a flame collector, 700 is a flue gas detector, and 800 is a controller.
Detailed Description
The invention aims at providing an analysis system and an analysis method for fuel axial staged premixed combustion characteristics so as to reduce the research cost of axial staged premixed combustion.
Furthermore, the embodiments shown below do not limit the summary of the invention described in the claims. The whole contents of the constitution shown in the following examples are not limited to the solution of the invention described in the claims.
Referring to fig. 1 to 8, the analysis system for fuel axial staged premixed combustion characteristics in the present invention includes: a first fuel inlet 101, an air inlet 104, an axially staged burner 200, a first primary fuel supply pipe 102, a first secondary fuel supply pipe 103, a fuel distributor 300, a primary air supply pipe 105, a secondary air supply pipe 106, an air distributor 500, a flue gas detector 700, a flame arrestor 600 and a controller 800. Wherein:
a first fuel inlet 101 for introducing liquid fuel, the liquid fuel directly interfacing with the first fuel inlet 101 to fuel the entire system;
an air access end 104 for introducing air, the air directly interfacing with the air access end 104 to provide air for the overall system;
an axial staged combustor 200 having a primary combustion zone and a secondary combustion zone; the main combustion area and the secondary combustion area respectively adopt quartz glass tubes with the length of 300mm, wherein the burner of the main combustion area adopts lean premixed combustion, and the secondary combustion area also adopts premixed combustion. The injection assembly of the secondary combustion zone comprises four nozzles which can be respectively controlled to be closed, wherein the diameter of the secondary nozzle is 1mm or 2mm, and the arrangement mode is crossed.
A first primary fuel supply pipe 102 in communication with the primary injection assembly of the primary combustion zone for introducing fuel into the primary injection assembly of the primary combustion zone for combustion therein;
a first secondary fuel supply pipe 103 in communication with the secondary injection assembly of the secondary combustion zone for introducing fuel into the secondary injection assembly of the secondary combustion zone for combustion therein; in the embodiment of the present invention, the first secondary fuel supply pipe 103 is a rubber pipe, and the pipe length is long, so that the secondary fuel/air premixed gas is already in a uniformly mixed state before being injected into the secondary combustion zone.
A fuel distributor 300 communicating the first fuel inlet 101 with the first primary fuel supply pipe 102 and the first secondary fuel supply pipe 103, the fuel distributor 300 being capable of regulating the first primary fuel flow into the first primary fuel supply pipe 102 and the first secondary fuel flow into the first secondary fuel supply pipe 103; there are many structures capable of realizing fuel distribution to the first primary fuel supply pipe 102 and the first secondary fuel supply pipe 103, and the present invention is not described in detail, and in order to achieve precise control, further, in this embodiment of the present invention, the fuel distributor 300 includes a first mass flow controller 301 disposed on the first primary fuel supply pipe 102 and a second mass flow controller 302 disposed on the first secondary fuel supply pipe 103, where the range of the first mass flow controller 301 is 0-200SLM, the precision is 1% full range, and the range of the second mass flow controller 302 is 0-5SLM.
A primary air supply pipe 105 communicating with an air inlet of the main combustion zone for supplying air to the main combustion zone;
a secondary air supply pipe 106 in communication with the first secondary fuel supply pipe 103 for premixing with the fuel in the first secondary fuel supply pipe 103; it is within the scope of the present invention to provide a conduit that enables the introduction of air into the first secondary fuel supply pipe 103. In the embodiment of the invention, the secondary air supply pipe 106 is a rubber pipe, and the length of the pipe is long, so that the air and the fuel can be uniformly mixed before entering the secondary injection assembly of the secondary combustion zone;
an air distributor 500 communicating the air inlet 104 with the primary air supply pipe 105 and the secondary air supply pipe 106, the air distributor 500 being capable of regulating the primary air flow into the primary air supply pipe 105 and the secondary air flow into the secondary air supply pipe 106. There are many structures that can achieve air distribution to different ducts, the present invention is not specifically described, and in order to achieve accurate control, the air distributor 500 in the embodiment of the present invention includes a third mass flow controller 501 disposed on the primary air supply pipe 105 and a fourth mass flow controller 502 disposed on the secondary air supply pipe 106, where the third mass flow controller 501 has a range of 0-1000SLM and the fourth mass flow controller 502 has a range of 0-60SLM.
The flue gas detector 700 is used for detecting the pollutant content in the flue gas discharged by the axial staged burner 200. In a normal state, the smoke detector 700 includes a smoke sampling probe for sampling smoke and a smoke analyzer for analyzing O in the smoke 2 、CONO and NO 2 In the embodiment of the invention, the sampling probe is arranged at the outlet of the secondary combustion zone, the sampling hole is opposite to the incoming flow direction of the smoke, the sampling probe introduces the smoke into the smoke analyzer, and the O in the smoke is analyzed 2 CO, NO and NO 2 Content of O 2 The measurement accuracy is +/-0.2%, and CO, NO and NO 2 The measurement accuracy of (2) is + -5% measured value. When the smoke component is actually measured, the smoke component data is calculated and averaged within a period of time after the smoke component is stable, so as to obtain the smoke component and NO under the working condition x the/CO emission data have all been converted to a dry oxygen concentration of 15% state (@ 15% O2) according to national standard requirements.
The flame collector 600 is used for collecting a main combustion flame image of the main combustion zone and a secondary combustion flame image of the secondary combustion zone. To obtain the heat release intensity of the flame under different combustion conditions, it was also tested to obtain an OH (OH chemical autofluorescence) profile, indicating that the position of the main reaction zone is higher with a stronger OH signal indicating a higher local heat release rate and lower with a weaker OH signal indicating a lower heat release rate. The OH test is obtained by combining an ICCD (enhanced CCD) camera with BP308/10 narrow-band filter plate measurement, the shutter speed of the ICCD is set to 700000ns, the delay time value is set to 5ns, the measurement is ensured to be carried out in the pulse width of each pulse, the flame form can be accurately captured, and the interference of the noise wave is reduced. The image is processed by methods such as Average (AVG) and Root Mean Square (RMS) after background noise correction.
The controller 800 receives the operating condition parameters, and controls the air distributor 500 and the fuel distributor 300 according to the operating condition parameters to adjust the primary air flow, the secondary air flow, the first primary fuel flow and the first secondary fuel flow within corresponding first thresholds; and obtaining the corresponding pollutant content, the main combustion flame image and the secondary combustion flame image under the working condition parameters. The working condition parameters include: total equivalence ratio, secondary equivalence ratio, and secondary duty ratio; the pollutant content includes: NO (NO) X Content and CO content.
By adopting the analysis system for the fuel axial grading premix combustion characteristics, the pollutant content, the main combustion flame image and the secondary combustion flame image under different working condition parameters can be obtained, so that the axial grading premix combustion characteristics can be obtained. Therefore, the on-site verification is not needed, and the research cost of axial staged premixed combustion is reduced. In addition, the analysis system of the fuel axial grading premixing combustion characteristics can analyze different fuels, and has wide application range.
The analysis system of the invention can be used for analyzing not only the axial staged premixed combustion characteristics of the liquid fuel, but also the axial staged premixed combustion characteristics of the liquid fuel-gas fuel.
In another embodiment of the present invention, in order to further expand the application range of the analysis system, the analysis system for fuel axial staged premixed combustion characteristics in the present invention further includes, on the basis of the above embodiments:
a gasifier 400 disposed between the first fuel inlet 101 and the fuel dispenser 300; the vaporizer 400 is used to vaporize the liquid fuel before premixing and mix the vaporized liquid fuel with the gaseous fuel. The gasifier 400 includes: a gasification tank 401; a gasification pipe 402 communicating with the first primary fuel supply pipe 102; and a preheater 403 for heating the oil bath in the gasification tank 401. When the liquid fuel enters the vaporizing tube 402, an oil bath is preheated under the preheater 403, and the oil bath preheats the fuel in the vaporizing tube 402 to vaporize. For accurate control, a temperature sensor can be arranged in the gasifier and used for detecting the heating temperature of the oil bath; further, a pressure sensor may be provided for detecting a pressure value of the gasified fuel in the gasification pipe 402.
A second fuel inlet 107 for introducing gaseous fuel;
a second primary fuel supply pipe 108 in communication with the first primary fuel supply pipe;
a second-stage fuel supply pipe 109 communicating with the first-stage fuel supply pipe;
the fuel distributor 300 communicates the second fuel inlet 107 with the second primary fuel supply pipe 108 and the second secondary fuel supply pipe 109, and is capable of regulating the flow of the second primary fuel into the second primary fuel supply pipe 108 and the flow of the second secondary fuel into the second secondary fuel supply pipe 109; further, the fuel dispenser 300 includes a fifth mass flow controller 303 disposed on the second primary fuel supply pipe 108 and a sixth mass flow controller 304 disposed on the second secondary fuel supply pipe 109, in addition to the first mass flow controller 301 and the second mass flow controller 302. Wherein the fifth mass flow controller 303 has a span of 0-200SLM with an accuracy of 1% full scale and the sixth mass flow controller 304 has a span of 0-5SLM. The fifth mass flow controller 303 is a seventh mass flow controller 305 disposed in parallel, wherein the seventh mass flow controller 305 has a span of 0-37.5SLM. When the span of the fifth mass flow controller 303 is exceeded under the operating conditions, the controller 300 selects the seventh mass flow controller 305 to regulate the flow to the second stage fuel supply pipe 109.
The corresponding controller further includes controlling the fuel dispenser 300 to adjust the second primary fuel flow and the second secondary fuel flow to be within corresponding second thresholds based on the operating condition parameters.
In order to further expand the application range of the analysis system, the secondary injection assembly in the secondary combustion zone comprises four nozzles, the working condition parameters also comprise the opening quantity of the nozzles, and the secondary injection assembly determines the opening or closing of the nozzles according to the working condition parameters. The diameter of the nozzles is 1mm or 2mm, and four nozzles are arranged in a crossed manner.
Based on the simulation results of the fuel axial classification according to the Chemkin zero-dimensional analysis of the different equivalence ratios of the secondary premixed gas, the fact that the increase of the secondary equivalence ratio is favorable for reducing NOx emission is found, the working condition that the secondary equivalence ratio is 5 is selected, experimental research of different secondary load ratios is carried out, and considering that the length of secondary flame cannot be too long, the secondary nozzle structure when the secondary equivalence ratio is 5 is arranged to be 2 secondary nozzles, and the diameter is 2mm. Changing the secondary load proportion to 5% and 10%, researching combustion characteristics at different adiabatic flame temperatures by changing the total equivalence ratio for the same secondary load proportion, wherein when the secondary load proportion is 5%, the first secondary fuel flow is smaller, the second mass flow controller 302 is controlled by adopting a Bronkhorst thermal mass flowmeter/controller with higher precision, the precision is +/-0.8% of reading +/-0.2% of full range, and the range is 0-5SLM; when the secondary load of the fuel is 10%, the third mass flow controller 303 is adopted, and a thermal mass flowmeter with the measuring range of 0-60SLM is adopted, and the precision is 1% of the full measuring range;
in order to control the secondary load ratio of the fuel to be unchanged by using the Bronkhorst thermal mass flowmeter with higher precision, considering that the secondary load ratio exceeds the Bronkhorst range when being larger, different secondary premixed gas equivalent ratio experimental researches are carried out when the secondary load ratio is selected to be 5%. The secondary equivalence ratio is divided into lean combustion and rich combustion, and in order to avoid the influence of different adiabatic flame temperatures of the secondary premixed gas on the NOx/CO emission of the fuel axial staged combustion, two equivalence ratios with the same adiabatic flame temperature near the equivalence ratio 1 are selected for research, wherein the two equivalence ratios are respectively 0.8 and 1.25. The NOx/CO emissions for the same fuel secondary load ratio and secondary equivalence ratio at different flame temperatures were measured by varying the total equivalence ratio.
In consideration of the secondary fuel measurement accuracy, the research of different fuel staged injection structures is carried out when the secondary load proportion is selected to be 5%. The different fuel graded injection structures are divided into a secondary injection mode and a secondary nozzle diameter, wherein the secondary injection mode is respectively 4 nozzle cross jet flows and 2 nozzle opposite jet flows, and the secondary nozzle diameter is respectively 1mm and 2mm.
The combustion characteristic influence study of the fuel axial grading mainly examines flame structure and pollutant emission, focuses on pollutant emission, and compares and analyzes the axial fuel grading combustion advantage with the traditional lean premixed combustion.
Referring to fig. 6 to 8, for convenience of control, the first fuel inlet 101, the first primary fuel supply pipe 102, the first secondary fuel supply pipe 103, the second fuel inlet 107, the second primary fuel supply pipe 108, the second secondary fuel supply pipe 109, the air inlet 104, the primary air supply pipe 105, and the secondary air supply pipe 106 are further provided with switching valves. The on-off section of the fuel introduction at the first fuel access end can be controlled by setting the on-off valve; the fuel introduction on the first primary fuel supply pipe can be directly controlled to be turned on or off; the fuel introduction on the first secondary fuel supply pipe can be directly controlled to be turned on and off. An on-off segment capable of controlling fuel introduction at the second fuel access end; the fuel introduction on the second-stage fuel supply pipe can be directly controlled to be turned on or off; the fuel introduction on the second-stage fuel supply pipe can be directly controlled to be turned on and off. The air inlet end can be directly controlled to be introduced into the air to be opened or closed, the air of the primary air supply pipe 105 can be directly controlled to be opened or closed, and the air of the secondary air supply pipe 106 can be directly controlled to be opened or closed.
The invention also discloses an analysis method of the fuel axial staged premixed combustion characteristics, which comprises the following steps:
docking the fuel with the first fuel access terminal;
docking air with the air access terminal;
setting working condition parameters; according to the invention, working condition parameters can be set according to experience so as to obtain favorable experimental data.
Receiving a working condition parameter, and controlling the air distributor and the fuel distributor according to the working condition parameter so as to adjust the primary air flow rate, the secondary air flow rate, the first primary fuel flow rate and the first secondary fuel flow rate to be within corresponding first thresholds; and obtaining the corresponding pollutant content, the main combustion flame image and the secondary combustion flame image under the working condition parameters.
Further, the method comprises the following steps:
docking the fuel with a second fuel access terminal;
and controlling the fuel distributor according to the working condition parameters so as to adjust the second-stage fuel flow and the second-stage fuel flow to be within corresponding second thresholds.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An analysis system for fuel axial staged premixed combustion characteristics, comprising:
a first fuel inlet for introducing liquid fuel;
an air inlet for introducing air;
an axial staged combustor having a primary combustion zone and a secondary combustion zone;
a first primary fuel supply pipe in communication with the primary injection assembly of the primary combustion zone;
a first secondary fuel supply pipe in communication with a secondary injection assembly of the secondary combustion zone, the secondary injection assembly comprising four nozzles;
a primary air supply duct in communication with the air inlet of the primary combustion zone;
a secondary air supply pipe in communication with the first secondary fuel supply pipe;
an air distributor communicating the air inlet with the primary air supply pipe and the secondary air supply pipe, the air distributor being capable of regulating a primary air flow rate into the primary air supply pipe and a secondary air flow rate into the secondary air supply pipe; the air distributor comprises a third mass flow controller arranged on the primary air supply pipe and a fourth mass flow controller arranged on the secondary air supply pipe;
a flue gas detector for detecting the content of pollutants in the flue gas discharged by the axial staged burner;
the flame acquisition instrument is used for acquiring a main combustion flame image of the main combustion zone and a secondary combustion flame image of the secondary combustion zone;
a second fuel inlet for introducing gaseous fuel;
a second stage fuel supply pipe in communication with the first stage fuel supply pipe;
a second secondary fuel supply pipe in communication with the first secondary fuel supply pipe;
a fuel distributor communicating the first fuel inlet with the first primary fuel supply pipe and the first secondary fuel supply pipe, the fuel distributor being capable of regulating a first primary fuel flow into the first primary fuel supply pipe and a first secondary fuel flow into the first secondary fuel supply pipe; a fuel distributor communicating the second fuel access end with the second primary fuel supply pipe and the second secondary fuel supply pipe, the fuel distributor being capable of regulating a second primary fuel flow into the second primary fuel supply pipe and a second secondary fuel flow into the second secondary fuel supply pipe; the fuel dispenser includes a first mass flow controller disposed on the first primary fuel supply pipe; a second mass flow controller disposed on the first secondary fuel supply pipe; a fifth mass flow controller disposed on the second stage fuel supply pipe; and a sixth mass flow controller disposed on the second stage fuel supply pipe;
a gasifier disposed between the first fuel access end and the fuel dispenser; and
a controller that receives operating condition parameters, and controls the air distributor and the fuel distributor according to the operating condition parameters to adjust the primary air flow, the secondary air flow, the first primary fuel flow, and the first secondary fuel flow to be within corresponding first thresholds; the corresponding pollutant content, the main combustion flame image and the secondary combustion flame image under the working condition parameters are obtained; the controller also controls the fuel distributor according to the working condition parameters so as to adjust the second primary fuel flow and the second secondary fuel flow to be within corresponding second thresholds; the working condition parameters comprise: total equivalence ratio, secondary duty ratio, and number of nozzles open; the contaminant content includes NO X And the secondary injection assembly determines the opening or closing of the nozzle according to the working condition parameters.
2. The fuel axially staged premixed combustion property analysis system of claim 1, wherein the gasifier includes:
a gasification tank;
the gasification pipe is communicated with the first fuel access end and is arranged inside the gasification tank; and
a preheater for heating the oil bath in the gasification tank.
3. The fuel axially staged premixed combustion characteristic analysis system of claim 1, wherein the fifth mass flow controller is a seventh mass flow controller arranged in parallel, wherein the seventh mass flow controller has a range of 0-37.5SLM.
4. The fuel axially staged premixed combustion characteristic analysis system as set forth in claim 1, wherein the first fuel inlet is further provided with a first switching valve, the first primary fuel supply pipe is provided with a second switching valve, the first secondary fuel supply pipe is provided with a third switching valve, and the air inlet is further provided with a fourth switching valve.
5. The fuel axial staged premixed combustion characteristic analysis system as set forth in claim 1, wherein the diameter of the nozzle is 1mm or 2mm, four of the nozzles being arranged crosswise.
6. A method for analyzing the fuel axial staged premixed combustion characteristics, characterized in that the method uses the system for analyzing the fuel axial staged premixed combustion characteristics according to claim 1; the analysis method comprises the following steps:
docking the fuel with the first fuel access terminal;
docking air with the air access terminal;
setting working condition parameters;
receiving working condition parameters, and controlling the air according to the working condition parametersAn air distributor and a fuel distributor to regulate the primary air flow, the secondary air flow, the first primary fuel flow, and the first secondary fuel flow within corresponding first thresholds; the corresponding pollutant content, the main combustion flame image and the secondary combustion flame image under the working condition parameters are obtained; the working condition parameters comprise: total equivalence ratio, secondary duty ratio, and number of nozzles open; the contaminant content includes NO X Content and CO content;
the analysis method further comprises the following steps:
docking the fuel with a second fuel access terminal;
and controlling the fuel distributor according to the working condition parameters so as to adjust the second-stage fuel flow and the second-stage fuel flow to be within corresponding second thresholds.
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