CN111505199A - Device and method for measuring combustion condition parameters of liquid fuel - Google Patents
Device and method for measuring combustion condition parameters of liquid fuel Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 153
- 239000007788 liquid Substances 0.000 title claims abstract description 132
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002309 gasification Methods 0.000 claims abstract description 93
- 239000002245 particle Substances 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 230000001052 transient effect Effects 0.000 claims abstract description 17
- 238000005496 tempering Methods 0.000 claims abstract description 14
- 230000002265 prevention Effects 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 6
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- 239000007789 gas Substances 0.000 claims description 29
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- 239000000919 ceramic Substances 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 238000012795 verification Methods 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 3
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
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- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
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Abstract
The invention discloses a device and a method for measuring combustion condition parameters of liquid fuel, wherein a porous medium combustor comprises a fuel injection cavity, a porous medium gasification region, a premixing observation chamber, a porous medium tempering prevention region, a porous medium combustion region, a product collection chamber and heat insulation layers arranged on two sides, wherein the fuel injection cavity, the porous medium gasification region, the premixing observation chamber, the porous medium tempering prevention region, the porous medium combustion region, the product collection chamber and the heat insulation layers are sequentially arranged from top to bottom; adding trace particles into the liquid fuel through a trace particle generator, monitoring the change of the trace particles by using a PIV (particle image velocimetry) tester, wherein the schlieren instrument is used for capturing transient images during the gasification of the liquid fuel; the high-speed camera is used for shooting a picture of liquid gasification time and a flame surface at complete combustion time in the porous medium combustor. The method adopts the schlieren instrument and the PIV technology to capture the mixing state of the liquid fuel and the air flow field in time, records the gasification time of the liquid fuel, simultaneously utilizes the high-speed camera to shoot the flame surface, records the complete combustion time of the liquid fuel, and is beneficial to the research on the working condition limit of the liquid fuel, particularly the gasification rate and the complete combustion rate.
Description
Technical Field
The invention relates to the technical field of liquid fuel combustion, in particular to a device and a method for measuring liquid fuel combustion working condition parameters.
Background
The current technical development observation of liquid fuel combustion shows that the porous medium burner has great development prospect in the application of enhancing liquid heat transfer in industrial combustion. Compared with the traditional open flame burner system, the porous medium burner has the advantages of high combustion density, complete fuel combustion, low emission of carbon monoxide and nitrogen oxide, compact structure, relatively high and uniform heat flux, heat cycle combustion property and the like. In addition, the porous medium combustor can enhance the evaporation of fog drops due to the regenerative combustion characteristic, and in the traditional combustion system, the gas thermal conductivity is very low, and the gas is less involved in radiation, and the convective heat transfer is the main heat transfer mode; in the porous medium combustion, due to the fact that the inner surface area of the porous medium is increased, not only is the convection heat exchange effect improved, but also two heat exchange modes of heat conduction heat exchange and radiation heat exchange are added, the temperature in the porous medium combustor is kept to be uniform, preheating of liquid fuel in a gasification area is facilitated, and therefore combustion efficiency is improved.
At present, about 85% of the world's primary energy demand depends on fossil fuels (coal, oil and natural gas), with oil (about 38%) predominating, and it is predicted that this trend will not change substantially in the next 20 years. As human awareness of global warming increases, regulations on the use of certain energy sources are being enforced in order to control the emission of pollutants that affect environmental and health issues. Liquid fuel plays an important role in power generation and transportation, but the actual combustion phenomenon of liquid fuel is complex, wherein the gasification rate determines the intensity of heat transfer and the intensity of combustion, and if the gasification can affect the combustion efficiency at a short time in the combustion of liquid fuel, the gasification rate is firstly accurately calculated to improve the gasification rate of liquid fuel; secondly, the complete combustion rate of the liquid fuel determines the pollutant discharge amount, and the improvement of the complete combustion rate of the liquid fuel can reduce the pollutant yield. Due to the nature of liquid fuel combustion, conventional combustion techniques have presented significant difficulties in calculating the rate of liquid fuel vaporization.
Disclosure of Invention
The invention aims to provide a porous medium liquid combustion flame surface measuring device and a method thereof, which are simple in system and method, convenient to operate and compact in structure.
In order to achieve the aim, the invention provides the following technical scheme that the device for measuring the combustion working condition parameters of the liquid fuel comprises a porous medium combustor, a PIV tester, a schlieren instrument and a high-speed camera; wherein,
the porous medium combustor comprises a fuel injection cavity, a porous medium gasification region, a premixing observation chamber, a porous medium tempering prevention region, a porous medium combustion region, a product collection chamber and heat insulation layers arranged on two sides, wherein the fuel injection cavity, the porous medium gasification region, the premixing observation chamber, the porous medium tempering prevention region, the porous medium combustion region and the product collection chamber are sequentially arranged from top to bottom;
the PIV tester and the schlieren instrument are respectively arranged at two sides of the premixing observation chamber, trace particles are added into the liquid fuel through the trace particle generator, the change of the trace particles is monitored by using the PIV tester, and the schlieren instrument is used for capturing transient images when the liquid fuel is gasified;
the high-speed camera is used for shooting a liquid gasification moment picture and a flame surface at a complete combustion moment in the porous medium combustor.
The device further comprises a temperature monitoring system, wherein the temperature monitoring system comprises a plurality of thermocouples which are distributed in each area of the porous medium combustor, and the thermocouples collect the temperature of each area in the porous medium combustor through a temperature acquisition card and are used for verifying and correcting the gasification time of the liquid fuel and the time of generating a flame surface by complete combustion.
Further, still include the fuel injection system, the fuel injection system is including the oil storage tank, tracer particle generator and the fuel injector that connect gradually, and fuel flows out from the oil storage tank, and by control valve control liquid, the quality of guaranteeing liquid at every turn keeps even, and the tracer particle generator of flowing through passes through the fuel injector with the fluidflowmeter and sprays the intracavity to the fuel injection.
Further, still include air intake system, air intake system including connect gradually insert porous medium combustor's air compressor and combustible gas holding vessel combustible gas storage vessel connect gradually behind the control valve with air compressor's the pipe connection after connect gradually ordinary pressure air dryer, control valve, mass flow meter and intake pipe, the intake pipe stretches into in the observation chamber in advance, ignites combustible gas through high energy point firearm, realizes that the burning preheats porous medium combustor.
Furthermore, the wall surface of the porous medium combustor is made of quartz glass, the porous medium gasification area and the porous medium tempering prevention area in the porous medium combustor are made of 3-5 mm ceramic pellets, the porous medium combustion area is made of 10-13 mm ceramic pellets, and transparent high-temperature-resistant stacked pellets can be used for better shooting the flame surface.
Further, a smoke analyzer is arranged in the product collecting chamber and used for analyzing combustion products and recording the quality of pollutants.
The invention also provides a method for measuring the combustion condition parameters of the liquid fuel, which comprises the following steps:
s1, preheating a porous medium burner;
s2, after preheating is completed, the fuel injection system injects liquid fuel with tracer particles into the fuel injection cavity;
s3, capturing a liquid fuel gasification picture by a high-speed camera of the porous medium gasification area, and judging whether the liquid fuel is gasified in the porous medium gasification area;
s4, starting the high-energy igniter, mixing the fuel with air in the premixing observation chamber, and monitoring the tracer particles by the PIV tester to obtain the time period when the transient speed of the tracer particles changes; checking and finding out a schlieren instrument monitoring gasification picture in the time period to check, reducing the gasification time range of the liquid fuel to obtain the occurrence moment of the gasification surface of the liquid fuel, recording the time for the liquid fuel with a certain flow at the moment to complete the complete gasification at the flow speed, calculating the gasification rate, and judging whether the gasification rate is efficient or not;
s5, liquid fuel is gasified and then fully mixed with air, and then the mixture passes through a porous medium anti-tempering area to reach a porous medium combustion area, a high-speed camera captures a flame surface when the mixture is combusted in the area, pictures are captured by cameras in all directions, and the time period for generating the flame surface is taken out when the flame surface is captured by the high-speed cameras in all directions, so that unreasonable conditions caused by uneven flame propagation are counteracted;
s6, finding out the complete combustion time period of the liquid fuel by comparing the theoretical temperature and the thermocouple collected temperature when the liquid fuel is completely combusted, further reducing the range and correcting the moment of generating a flame surface when the liquid fuel is completely combusted, and if the error between the theoretical temperature and the thermocouple collected temperature is larger, improving the complete combustion rate of the liquid fuel by adjusting the pore size of a high-temperature-resistant small sphere in a porous medium combustion area;
and S7, finally, analyzing the combustion products through a flue gas analyzer, and recording the quality of pollutants.
Further, in step S1, the combustible gas storage tank is opened, a certain amount of combustible gas is introduced and mixed with air, the high-energy igniter is opened to ignite the combustible gas, combustion is realized to preheat the porous medium burner, and the introduction of air is stopped after the combustible gas is completely combusted.
Further, in step S4, the PIV tester monitors the trace particles to calculate a transient speed of the trace particles, and obtains a time period during which the transient speed of the trace particles changes, and also finds out a schlieren instrument monitoring gasification picture of the time period for verification, and correspondingly observes all pictures monitored by the schlieren instrument, and obtains a time when the picture corresponding to the complete gasification occurs, and reduces a gasification time range of the liquid fuel, and obtains a time when the gasification surface of the liquid fuel occurs, and calculates a complete gasification rate of the liquid fuel at a current temperature, and finds out a temperature collected by a thermocouple in an area corresponding to the time when the gasification surface occurs, and compares the temperature with a theoretical gasification rate in the current temperature range of the liquid fuel, and determines whether the gasification rate is efficient.
Further, in step S6, a time period range in which the thermocouple in the porous medium combustion area detects the occurrence of the temperature range is found according to the theoretical temperature range corresponding to the complete combustion of the liquid fuel, for example, the time period in which the flame surface is captured by the high-speed camera is greatly different from the time period corresponding to the temperature monitored by the thermocouple, the complete combustion efficiency of the liquid fuel is improved by adjusting the burner structure by adjusting the pore size of the high-temperature resistant pellet in the porous medium combustion area, and for example, the difference is small, and the range is further narrowed by taking the overlapping time period to correct the occurrence time of the flame surface.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the porous medium combustion mode of combustion from top to bottom is adopted, the characteristic that liquid flows downwards under the action of gravity is fully utilized, premixing of high-concentration fuel gas and air is realized, the lean combustion limit is widened, and the temperature distribution in a porous medium combustion zone is more uniform.
2. The porous medium burner is preheated by combustible gas in advance, so that the gasification efficiency of the liquid fuel in the porous medium gasification area can be improved.
3. Adding trace particles into the liquid fuel, capturing the gasification flame surface of the liquid by utilizing the PIV technology, comparing the gasification flame surface with a picture monitored by a schlieren instrument, and correcting the gasification rate of the liquid.
4. The pictures are shot through a plurality of high-speed cameras, the flame surface propagation position is determined by determining the average position of each flame, the irrationality caused by uneven flame propagation is counteracted, meanwhile, the temperature and the flame surface position acquired by the thermocouple are combined, the calculated working condition limit is more accurate including the gasification rate, the judgment of the combustion influence of the gasification rate on the liquid fuel is facilitated, the optimal gasification rate is achieved by controlling the flow rate of the liquid fuel, and the combustion efficiency is improved.
5. The design is favorable for the research on flame stability during the combustion of different liquid fuels, thereby working condition limits under the state are calculated, the gasification rate and the complete combustion efficiency of the liquid fuels are improved by adjusting the internal structure of the porous medium, and a method is provided for preventing the flame from being misfired and tempered during the combustion.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-a computer, 2-a temperature acquisition card, 3-a high-speed camera, 4-a schlieren instrument, 5-a high-energy igniter, 6-a flue gas analyzer, 7-a heat insulation layer, 8-a thermocouple, 9-a fuel injection cavity, 10-a fuel injector, 11-a liquid flowmeter, 12-a porous medium gasification area, 13-a premixing observation chamber, 14-an air inlet pipe, 15-a mass flowmeter, 16-a porous medium anti-tempering area, 17-a porous medium combustion area, 18-a product collection chamber, 19-a trace particle generator, 20-a control valve, 21-a data acquisition instrument, 22-a PIV tester, 23-an atmospheric air dryer, 24-an oil storage tank, 25-a combustible gas storage tank and 26-an air compressor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1, the present application provides a liquid fuel combustion condition parameter measuring device, which comprises a porous medium burner, a PIV tester 22, a schlieren instrument 4 and a high-speed camera 3; wherein,
the porous medium combustor comprises a fuel injection cavity 9, a porous medium gasification area 12, a premixing observation chamber 13, a porous medium tempering prevention area 16, a porous medium combustion area 17, a product collection chamber 18 and heat insulation layers 7 arranged on two sides, wherein the fuel injection cavity, the porous medium gasification area 12, the premixing observation chamber, the porous medium tempering prevention area, the porous medium combustion area 17 and the product collection chamber are sequentially arranged from top to bottom;
the PIV tester 22 and the schlieren instrument 4 are respectively arranged at two sides of the premixing observation chamber 13, trace particles are added into the liquid fuel through the trace particle generator 19, the change of the trace particles is monitored by the PIV tester 22, and the schlieren instrument 4 is used for capturing transient images when the liquid fuel is gasified;
the high-speed camera 3 is used for shooting a picture of liquid gasification time and a flame surface at complete combustion time in the porous medium combustor.
In the above embodiment, the high-speed camera 3 is arranged at two positions of the porous medium gasification area 12 and the porous medium combustion area 17, 4-8 high-speed cameras can be arranged around the high-speed camera according to the situation, pictures in all directions can be taken, and a filter is added to the lens of the high-speed camera 3. A high-speed camera 3 is used for shooting a picture of liquid gasification in the porous medium combustor, a schlieren instrument 4 is arranged beside a premixing observation chamber 13, tracer particles are added into the liquid, a PIV tester 22 is used for monitoring the air flow mixing state, and the schlieren instrument 4 is used for shooting a picture of liquid fuel gasification. The product collection chamber 18 is also provided with a flue gas analyzer 6 for analyzing the components of the combustion products and recording the amount of pollutants.
In a further preferred embodiment, the device further comprises a temperature monitoring system, wherein the temperature monitoring system comprises a plurality of thermocouples 8 distributed in each area of the porous medium combustor, and the thermocouples 8 collect the temperature of each area of the porous medium combustor through a temperature collecting card 2 to verify and correct the gasification moment of the liquid fuel and the moment of generating a flame surface through complete combustion.
In the above embodiment, the thermocouple 8 can monitor the temperature values of the porous medium combustor at different times corresponding to each region respectively, and cooperates with the PIV tester 22 and the plotter to provide mutual verification of the temperature and the time for the PIV tester 22 and the plotter, and the PIV is a particle imaging velocimeter. In the above embodiment, the PIV tester 22, the plotter, the thermocouple, the temperature acquisition card 2 and the high-speed camera 3 all transmit data and pictures to the computer 1 for processing, and the PIV tester 22 is connected to the data acquisition instrument 21.
In a further preferred embodiment, the fuel injection system is further included, the fuel injection system comprises a fuel storage tank 24, a tracer particle generator 19 and a fuel injector 10 which are connected in sequence, fuel flows out from the fuel storage tank 24, liquid is controlled by a control valve 20, the quality of the liquid is guaranteed to be uniform each time, and the liquid flows through the tracer particle generator 19 and the liquid flow meter 11 and is injected into the fuel injection cavity 9 through the fuel injector 10.
In the above embodiment, the fuel injector 10 is a needle valve type injector; the tracer particles in the tracer particle generator 19 adopt 3-5 microns of Al2O3The particle and PIV tester 22 measures the transient velocity distribution of the flow field indirectly by measuring the displacement of the tracer particles in a known short time interval, the motion of the tracer particles can truly reflect the motion state of the flow field, the precision and the resolution of a single-point measurement technology are achieved, the overall structure and the transient image displayed by the plane flow field can be obtained, the relevant information of the whole flow field can be recorded at the same time, the average velocity, the pulsation velocity, the strain rate and the like can be respectively given, and meanwhile, the method is also a non-contact type measuring method.
In a further preferred embodiment, the device further comprises an air inlet system, wherein the air inlet system comprises an air compressor 26 and a combustible gas storage tank 25 which are sequentially connected and connected with the porous medium burner, the combustible gas storage tank 25 is connected with the control valve 20 and then is connected with a pipeline of the air compressor 26, and then is sequentially connected with an atmospheric air dryer 23, the control valve 20, the mass flow meter 15 and an air inlet pipe 14, the air inlet pipe 14 extends into the premixing observation chamber 13, and the combustible gas is ignited through the high-energy igniter 5, so that the porous medium burner is preheated through combustion.
In the above embodiment, the air compressor 26 provides oxygen in the preheating burner stage and the liquid fuel combustion stage, respectively, and the same quality of air is ensured to be injected into the premixing observation chamber 13 through the control valve 20 each time; before the liquid fuel is introduced, the combustible gas storage tank 25 is firstly opened to introduce the combustible gas, so that the porous medium burner is preheated by combustion. The combustible gas storage tank 25 is closed during the supply of gas during the liquid fuel combustion phase.
In a further preferred embodiment, the porous medium burner system comprises a porous medium burner wall made of quartz glass; the porous medium gasification area 12 adopts high-temperature-resistant ceramic pellets, the porous medium tempering-proof area 16 adopts 3-5 mm ceramic pellets, the porous medium combustion area 17 adopts high-temperature-resistant ceramic pellets, and transparent high-temperature-resistant stacked pellets can be adopted for better shooting a flame surface.
The pellets with the appropriate diameter are selected according to the gasification effect by piling the pellets in the porous medium gasification zone 12 in the embodiment, the pellets with the large pore diameter can be selected if the gasification effect is good, the flow resistance of the liquid fuel is reduced, the flow speed is increased, and the pellets with the small diameter can be selected if the gasification effect is poor, so that the full preheating is realized.
In order to better achieve the aim of the invention, the invention also provides a liquid fuel flame surface measuring method based on the porous medium burner, which uses the measuring device, and comprises the following steps:
s1, preheating a porous medium burner, opening a combustible gas storage tank 25, introducing a certain amount of combustible gas to mix with air, opening a high-energy igniter 5 to ignite the combustible gas, realizing combustion, preheating the porous medium burner, and stopping introducing the air after the combustible gas is completely combusted;
s2, after preheating is finished, the fuel injection system injects liquid fuel with tracer particles into the fuel injection cavity 9;
s3, capturing a liquid fuel gasification picture by a high-speed camera of the porous medium gasification area 12, and judging whether the liquid fuel is gasified in the porous medium gasification area 12;
s4, starting the high-energy igniter 5, mixing the fuel with air in the premixing observation chamber 13, and monitoring the tracer particles by the PIV tester 22 to obtain the time period when the transient speed of the tracer particles changes; meanwhile, finding out a gasification picture monitored by the schlieren instrument 4 in the time period for verification, reducing the gasification time range of the liquid fuel, obtaining the occurrence moment of the gasification surface of the liquid fuel, recording the time for the liquid fuel with a certain flow at the moment to complete gasification at the flow speed, calculating the gasification rate, and judging whether the gasification rate is efficient or not;
in the above steps, the PIV tester 22 monitors the trace particles to calculate the transient speed of the trace particles, and obtains the time period when the transient speed of the trace particles changes, then finds out the monitoring gasification picture of the schlieren instrument 4 in the time period for verification, correspondingly observes all the pictures monitored by the schlieren instrument 4, obtains the moment when the corresponding picture occurs when the gasification is completely performed, reduces the gasification time range of the liquid fuel, obtains the moment when the gasification surface of the liquid fuel occurs, records the time for the liquid fuel with a certain flow at the moment to complete the complete gasification at the flow speed, calculates the gasification rate, and judges whether the gasification rate is efficient or not.
In the above steps, the PIV tester monitors the trace particles to calculate the transient speed of the missing particles, obtain the time period when the transient speed of the missing particles changes, and at the same time, find out the monitoring gasification picture of the schlieren instrument in the time period to verify, correspondingly observe all the pictures monitored by the schlieren instrument, obtain the moment when the picture corresponding to the complete gasification occurs, narrow the gasification time range of the liquid fuel, obtain the moment when the gasification surface of the liquid fuel occurs, record the time for the liquid fuel at a certain flow rate at the moment to complete the complete gasification at the flow rate, calculate the complete gasification rate of the liquid fuel at the current temperature, find out the temperature collected by the thermocouple in the area corresponding to the moment when the gasification surface occurs, compare the temperature with the theoretical gasification rate in the current temperature range of the liquid fuel, and judge whether the gasification rate is efficient or not.
S5, after being gasified, the liquid fuel is fully mixed with air and then reaches a porous medium combustion area 17 through a porous medium anti-tempering area 16, when the liquid fuel is combusted in the area, the high-speed camera 3 captures a flame surface, pictures are captured through cameras in all directions, the time period for generating the flame surface is taken out when the flame surface is captured through the high-speed cameras in all directions, and unreasonable effect caused by uneven flame propagation is counteracted;
s6, finding out the complete combustion time period of the liquid fuel by comparing the theoretical temperature when the liquid fuel is completely combusted with the temperature collected by the thermocouple 8, further narrowing the range and correcting the moment of generating a flame surface when the liquid fuel is completely combusted, and if the error between the theoretical temperature and the temperature is larger than the temperature, improving the complete combustion rate of the liquid fuel by adjusting the pore size of a high-temperature-resistant small sphere in the porous medium combustion zone 17;
in the above steps, the time period range of the temperature range detected by the thermocouple in the porous medium combustion zone is found according to the corresponding theoretical temperature range when the corresponding liquid fuel is completely combusted, if the time period of capturing the flame surface by the high-speed camera is greatly different from the time period corresponding to the temperature monitored by the thermocouple, the complete combustion efficiency of the liquid fuel is improved by adjusting the structure of the burner by adjusting the pore size of the high-temperature-resistant small ball in the porous medium combustion zone, and if the difference is small, the overlapping time period is further shortened, and the flame surface generation time is corrected. And S7, finally, analyzing the combustion products through the flue gas analyzer 6, and recording the quality of pollutants.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (10)
1. A liquid fuel combustion condition parameter measuring device is characterized by comprising a porous medium combustor, a PIV tester, a schlieren instrument and a high-speed camera; wherein,
the porous medium combustor comprises a fuel injection cavity, a porous medium gasification region, a premixing observation chamber, a porous medium tempering prevention region, a porous medium combustion region, a product collection chamber and heat insulation layers arranged on two sides, wherein the fuel injection cavity, the porous medium gasification region, the premixing observation chamber, the porous medium tempering prevention region, the porous medium combustion region and the product collection chamber are sequentially arranged from top to bottom;
the PIV tester and the schlieren instrument are respectively arranged at two sides of the premixing observation chamber, trace particles are added into the liquid fuel through the trace particle generator, the change of the trace particles is monitored by using the PIV tester, and the schlieren instrument is used for capturing transient images when the liquid fuel is gasified;
the high-speed camera is used for shooting a liquid gasification moment picture and a flame surface at a complete combustion moment in the porous medium combustor.
2. The liquid fuel combustion condition parameter measuring device according to claim 1, characterized in that: the device is characterized by further comprising a temperature monitoring system, wherein the temperature monitoring system comprises a plurality of thermocouples which are distributed in each area of the porous medium combustor, the thermocouples are used for collecting the temperature of each area in the porous medium combustor through a temperature collecting card and verifying and correcting the time when the liquid fuel is gasified and the time when the liquid fuel is completely combusted to generate a flame surface.
3. The liquid fuel combustion condition parameter measuring device according to claim 1, characterized in that: still include the fuel injection system, the fuel injection system is including the oil storage tank, tracer particle generator and the fuel injector that connect gradually, and the fuel flows out from the oil storage tank, and by control valve control liquid, the quality of guaranteeing liquid at every turn keeps even, and the tracer particle generator of flowing through passes through the fuel injector with the fluidflowmeter and sprays the intracavity to the fuel injection.
4. The liquid fuel combustion condition parameter measuring device according to claim 1, characterized in that: still include air intake system, air intake system including connect gradually insert porous medium combustor's air compressor and combustible gas holding vessel after the combustible gas holding vessel connection control valve and air compressor's the pipe connection connect gradually ordinary pressure air dryer, control valve, mass flow meter and intake pipe, the intake pipe stretches into in the observation chamber in advance, ignites combustible gas through high energy point firearm, realizes that the burning preheats porous medium combustor.
5. The liquid fuel combustion condition parameter measuring device according to claim 1, characterized in that: the wall surface of the porous medium combustor is made of quartz glass, a porous medium gasification area and a porous medium tempering prevention area in the porous medium combustor are made of 3-5 mm ceramic pellets, a porous medium combustion area is made of 10-13 mm ceramic pellets, and transparent high-temperature-resistant stacked pellets can be used for better shooting a flame surface.
6. The liquid fuel combustion condition parameter measuring device according to claim 1, characterized in that: and a smoke analyzer is arranged in the product collecting chamber and used for analyzing combustion products and recording the quality of pollutants.
7. A method as claimed in claims 1 to 6, characterized by comprising the following steps:
s1, preheating a porous medium burner;
s2, after preheating is completed, the fuel injection system injects liquid fuel with tracer particles into the fuel injection cavity;
s3, capturing a liquid fuel gasification picture by a high-speed camera of the porous medium gasification area, and judging whether the liquid fuel is gasified in the porous medium gasification area;
s4, starting the high-energy igniter, mixing the fuel with air in the premixing observation chamber, and monitoring the tracer particles by the PIV tester to obtain the time period when the transient speed of the tracer particles changes; meanwhile, finding out a monitoring gasification picture of the schlieren instrument in the time period for verification, reducing the gasification time range of the liquid fuel, obtaining the occurrence moment of the gasification surface of the liquid fuel, recording the time for the liquid fuel with a certain flow at the moment to complete gasification at the flow speed, calculating the gasification rate, and judging whether the gasification rate is efficient or not;
s5, liquid fuel is gasified and then fully mixed with air, and then the mixture passes through a porous medium anti-tempering area to reach a porous medium combustion area, a high-speed camera captures a flame surface when the mixture is combusted in the area, pictures are captured by cameras in all directions, and the time period for generating the flame surface is taken out when the flame surface is captured by the high-speed cameras in all directions, so that unreasonable conditions caused by uneven flame propagation are counteracted;
s6, finding out the complete combustion time period of the liquid fuel by comparing the theoretical temperature and the thermocouple collected temperature when the liquid fuel is completely combusted, further reducing the range and correcting the moment of generating a flame surface when the liquid fuel is completely combusted, and if the error between the theoretical temperature and the thermocouple collected temperature is larger, improving the complete combustion rate of the liquid fuel by adjusting the pore size of a high-temperature-resistant small sphere in a porous medium combustion area;
and S7, finally, analyzing the combustion products through a flue gas analyzer, and recording the quality of pollutants.
8. The method for measuring the combustion condition parameters of the liquid fuel according to claim 7, wherein: in the step S1, the combustible gas storage tank is opened to introduce a certain amount of combustible gas to mix with air, the high-energy igniter is opened to ignite the combustible gas, combustion is realized to preheat the porous medium burner, and the introduction of air is stopped after the combustible gas is completely combusted.
9. The method for measuring the combustion condition parameters of the liquid fuel according to claim 7, wherein: in step S4, the PIV tester monitors the trace particles to calculate the transient speed of the trace particles, and obtains a time period during which the transient speed of the trace particles changes, and also finds out a vaporization screen monitored by the schlieren instrument for verification in the time period, and correspondingly observes all screens monitored by the schlieren instrument, and obtains the time when the corresponding screen occurs when complete vaporization occurs, and reduces the vaporization time range of the liquid fuel to obtain the time when the liquid fuel vaporizes, and records the time taken for complete vaporization of the liquid fuel at a certain flow rate at the time, and calculates the complete vaporization rate of the liquid fuel at the current temperature, and finds out the temperature collected by the thermocouple in the region corresponding to the vaporization time, and compares the temperature with the theoretical vaporization rate in the current temperature range of the liquid fuel, and determines whether the vaporization rate is efficient.
10. The method for measuring the combustion condition parameters of the liquid fuel according to claim 7, wherein: in step S6, a time period range in which the thermocouple in the porous medium combustion area detects the occurrence of the temperature range is found according to the theoretical temperature range corresponding to the complete combustion of the liquid fuel, if the time period for capturing the flame surface by the high-speed camera is different from the time period corresponding to the thermocouple monitoring temperature, the complete combustion efficiency of the liquid fuel is improved by adjusting the burner structure by adjusting the pore size of the high-temperature resistant pellets in the porous medium combustion area, and if the difference is small, the range is further narrowed by taking the overlapping time period to correct the occurrence time of the flame surface.
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