CN114034661B - Plasma auxiliary fuel pyrolysis/oxidation reactor for in-situ laser diagnosis - Google Patents
Plasma auxiliary fuel pyrolysis/oxidation reactor for in-situ laser diagnosis Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 34
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 28
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 28
- 230000003647 oxidation Effects 0.000 title claims abstract description 25
- 238000003745 diagnosis Methods 0.000 title claims abstract description 22
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 10
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- 239000000919 ceramic Substances 0.000 claims description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 23
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 20
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 16
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- 238000012544 monitoring process Methods 0.000 claims description 3
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 claims 1
- 229910052731 fluorine Inorganic materials 0.000 claims 1
- 239000011737 fluorine Substances 0.000 claims 1
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- 210000002381 plasma Anatomy 0.000 description 34
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- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012625 in-situ measurement Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 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
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
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Abstract
The invention discloses a plasma auxiliary fuel pyrolysis/oxidation reactor for in-situ laser diagnosis, which comprises a reactor front end, a reactor main body and a reactor tail end which are connected in sequence; the front end of the reactor is used for air intake and rectification and comprises an air intake end cover and a rectification section which are connected together; the reactor main body is used for carrying out plasma-assisted fuel pyrolysis/oxidation reaction and carrying out in-situ transient measurement on component concentration and temperature through a tunable diode absorption spectrum technology, and comprises a vacuum cavity connected with a rectifying section, wherein a reaction tank is arranged in the vacuum cavity; the reactor ends were used to achieve vacuum environment, venting, and visualization. The invention is used for carrying out transient measurement on the concentration and the temperature of the components in the reaction process, establishing and perfecting key information databases of the concentration and the temperature of the components and the like, and supporting the study of a dynamic model of the pyrolysis/oxidation of the plasma auxiliary fuel.
Description
Technical Field
The invention belongs to the technical field of novel combustion regulation and control, and particularly relates to a plasma auxiliary fuel pyrolysis/oxidation reactor for in-situ laser diagnosis.
Background
The combustion of fossil fuel brings a series of environmental problems such as atmospheric pollution, greenhouse effect and the like, effectively improves the utilization rate of fuel, improves the efficiency of combustion equipment, reduces pollutant emission, is crucial for sustainable utilization of energy and guarantee of energy safety, and is a necessary way for realizing the aim of double carbon.
Therefore, researchers at home and abroad continuously propose novel combustion regulation and control technologies, such as changing ignition modes, designing flow field forms of a combustion chamber, controlling fuel concentration distribution and the like. Among the many ignition aid technologies, plasma-based ignition aid technologies have emerged in recent years. The plasma is a substance in a fourth state different from gas, liquid and solid, contains electrons, positive and negative ions, active free radicals, excited state components and the like, has equal positive and negative charge numbers, is a good conductor in the pair, and is an ionized state substance with neutral electricity. The plasma plays a role in promoting combustion through a thermal effect, a kinetic effect and a transport effect, and has great application potential in the aspects of changing ignition and combustion chemical reaction paths, improving flame stability, widening ignition limit, shortening ignition delay time, reducing pollutant emission and the like. Among them, low temperature (non-equilibrium) plasmas are receiving attention because of their stronger chemical activity, lower power, higher efficiency, and longer electrode lifetime. It is clear that the kinetic mechanism of low temperature plasma ignition combustion supporting is indispensable for combustion regulation. However, due to complex interactions between low-temperature plasma reaction dynamics and combustion chemical reaction dynamics, the dynamics model established by the current research of domestic and foreign scholars has larger uncertainty, and the model prediction result has larger deviation from experimental data. A great amount of scientific experiments are still needed to be carried out, and a component and concentration database of the pyrolysis/oxidation of the plasma auxiliary fuel is established and perfected, so that a basis is provided for the establishment and optimization of the plasma reaction dynamics mechanism.
The research work of students is generally carried out on a coaxial cylindrical dielectric barrier discharge plasma generating device, but due to the action of gravity, an elongated electrode in the center of the device tends to bend downwards, coaxiality between the electrode and an outer ring electrode is not ensured, uniform plasma cannot be generated due to the change of a discharge gap, and component data errors generated by pyrolysis/oxidation of fuel are larger. In addition, for the measurement of the pyrolysis/oxidation components of the plasma-assisted fuel, researchers generally use a quartz glass tube or other gas collecting device for sampling, and then introduce the gas into a detection device such as a gas chromatograph, a nitrogen oxide analyzer, a fourier infrared spectrometer, and the like for analysis. These methods are all ex-situ measurement, the measurement system is very expensive and complex in structure, the detection and analysis time is long, and the transient concentration change of the components cannot be synchronously measured when the fuel is subjected to the action of plasma.
Disclosure of Invention
The invention aims to provide a plasma auxiliary fuel pyrolysis/oxidation reactor capable of realizing in-situ laser diagnosis, which is used for carrying out transient measurement on component concentration and temperature in the reaction process, establishing and perfecting a key information database of component concentration, temperature and the like, and supporting the study of a dynamic model of the plasma auxiliary fuel pyrolysis/oxidation.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
a plasma auxiliary fuel pyrolysis/oxidation reactor for in-situ laser diagnosis comprises a reactor front end, a reactor main body and a reactor tail end which are connected in sequence;
The front end of the reactor is used for air intake and rectification, and comprises an air intake end cover and a rectification section which are connected together, wherein two reaction gas inlet holes are symmetrically formed in the front and the back of the air intake end cover and are used for introducing reaction gas into the reactor, honeycomb ceramics are arranged in the rectification section and are used for rectifying the reactor, and two atmosphere gas inlet holes are symmetrically formed in the upper and the lower of the rectification section and are used for introducing atmosphere gas;
The reactor main body is used for carrying out plasma-assisted fuel pyrolysis/oxidation reaction and carrying out in-situ transient measurement on component concentration and temperature through a tunable diode absorption spectrum technology, and comprises a vacuum cavity connected with a rectifying section, an opening is formed above the vacuum cavity, and a polytetrafluoroethylene electrode base is arranged for fixing and connecting an electrode wire; the front and back surfaces of the vacuum cavity are symmetrically provided with holes for installing calcium fluoride windows, so as to provide an optical path for laser diagnosis; a reaction tank is arranged in the vacuum cavity;
the reactor ends were used to achieve vacuum environment, venting, and visualization.
The invention is further improved in that the air inlet end cover and the rectifying section are connected through the threaded holes additionally provided with bolts and are sealed through the fluororubber ring, and a reverse-shaped sealing area is formed at the front end.
The invention is further improved in that the tail end of the vacuum cavity is provided with a pressure detection hole for installing a pressure gauge, so that the real-time monitoring of the internal pressure of the vacuum cavity is realized.
The invention is further improved in that the outer side of the calcium fluoride window is provided with a flange end cover, the flange end cover is connected with the vacuum cavity through a threaded hole additionally provided with a bolt, and sealing with the calcium fluoride window is realized by using a fluororubber ring.
The invention is further improved in that the reaction tank comprises a rectangular section channel formed by an upper quartz glass sheet, a lower quartz glass sheet, a front ceramic clamping plate and a rear ceramic clamping plate, wherein the front ceramic clamping plate and the rear ceramic clamping plate are respectively provided with two calcium fluoride mounting holes, and calcium fluoride glass is additionally arranged to provide an optical path for laser diagnosis; the stainless steel electrode plates are arranged on ceramic supporting seats on the upper side and the lower side of the reaction tank, a silica gel sheet is additionally arranged between the quartz glass sheet and the stainless steel electrode plates, and the upper ceramic supporting seat and the lower ceramic supporting seat are connected together through ceramic bolts; the reaction tank is inserted into the rectifying section through a rectangular section channel formed by the quartz glass sheet and the ceramic clamping plate to realize positioning.
The invention is further improved in that the whole reaction tank is placed on a stainless steel support plate which is connected with a vacuum cavity.
The invention is further improved in that the tail end of the reactor comprises an exhaust section connected with the vacuum cavity, and the middle part of the exhaust section is provided with an exhaust hole for connecting a vacuum pump to realize the negative pressure environment inside the reactor.
The invention is further improved in that the tail end of the exhaust section is additionally provided with a quartz glass window through a window end cover for visually analyzing the dielectric barrier discharge characteristics.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. The main body of the invention is completely sealed stainless steel material, and a heating belt can be wound to control the reaction temperature, so that the invention is used for researching the pyrolysis/oxidation of plasma auxiliary gas or liquid fuel.
2. The invention carries out unique design on the rectifying section structure to generate more stable and uniform reaction gas.
3. The invention realizes a dielectric barrier discharge mode between rectangular flat plates by unique design of the reaction tank structure, and generates very uniform low-temperature plasma.
4. According to the invention, the thin silica gel sheet is additionally arranged between the stainless steel electrode plate and the quartz glass sheet, so that the formation of arc at the edge of the electrode plate is effectively prevented, and more uniform low-temperature plasma is generated.
5. According to the invention, a quartz glass window is designed at the tail end of the reactor, so that visual analysis can be performed on discharge characteristics.
6. The exhaust hole is formed at the tail end of the reactor and can be connected with the vacuum pump to realize the negative pressure environment in the reactor, so that more uniform plasmas can be generated, the broadening of absorption spectrum is reduced, and the post-processing of data is facilitated.
7. According to the invention, the transient measurement of the tunable diode absorption spectrum technology on the target product is realized by designing an optical passage in the plasma action area.
8. According to the invention, two pieces of calcium fluoride glass are arranged on each ceramic clamping plate, and two paths of lasers can be arranged, so that simultaneous measurement of two components is realized.
9. The invention adopts the tunable diode absorption spectrum technology, and has the advantages of simple system, low device cost, strong anti-interference capability, capability of in-situ non-contact measurement, multiple species measurement, strong selectivity and high precision.
In summary, the invention designs a plasma-assisted fuel pyrolysis/oxidation reactor based on in-situ laser diagnosis. The rectangular flat dielectric barrier discharge plasma generating device can ensure the consistency of discharge gaps, generate uniform plasmas and ensure better repeatability of fuel pyrolysis/oxidation component data measurement. And an optical path is designed in a plasma action area, and a tunable diode absorption spectrum technology is used for carrying out transient measurement on various target products in situ. As a laser diagnosis method, the tunable diode absorption spectrum measurement technology has the advantages of simple measurement system, easy miniaturization, strong anti-interference capability and the like, and plays an important role in the measurement fields of temperature, component concentration and speed of combustion equipment such as a high-temperature combustion furnace, an engine and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention taken in 1/4 section.
FIG. 2 is an exploded schematic view of a partial structure (reaction cell) of the present invention.
Reference numerals illustrate:
The device comprises a 1-air inlet end cover, a 2-threaded hole A, a 3-fluororubber ring A, a 4-atmosphere air inlet hole, a 5-vacuum cavity, a 6-reaction tank, a 7-threaded hole B, an 8-fluororubber ring B, a 9-polytetrafluoroethylene electrode base, a 10-pressure detection hole, a 11-fluororubber ring C, a 12-exhaust section, a 13-fluororubber ring D, a 14-window end cover, a 15-rectifying section, a 16-reaction air inlet hole, a 17-honeycomb ceramic, a 18-threaded hole C, a 19-fluororubber ring E, a 20-calcium fluoride window, a 21-threaded hole D, a 22-flange end cover, a 23-threaded hole E, a 24-exhaust hole, a 25-threaded hole F, a 26-quartz glass window, a 27-stainless steel electrode plate, a 28-quartz glass sheet, a 29-ceramic clamping plate, a 30-threaded hole G, a 31-ceramic support seat, a 32-silica gel sheet, a 33-calcium fluoride installation hole, a 34-threaded hole H and a 35-stainless steel support plate.
Detailed Description
The following specific embodiments of the present application are given, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present application.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 and fig. 2, the plasma-assisted fuel pyrolysis/oxidation reactor based on in-situ laser diagnosis provided by the invention can be divided into three parts according to the order of gas flow: reactor front, reactor body and reactor end.
The main function of the front end of the reactor is air intake and rectification. As shown in fig. 1, the air inlet end cover 1 and the rectifying section 15 are connected by additionally installing bolts through the opened threaded holes A2, and are sealed through the fluororubber ring A3, so that a reverse-shaped sealing area is formed at the front end, and meanwhile, the rectifying section 15 and the vacuum cavity 5 are connected by additionally installing bolts through the opened threaded holes C18. Two reaction gas inlet holes 16 are symmetrically formed in the front and back of the air inlet end cover 1 and used for introducing reaction gas into the reactor, honeycomb ceramics 17 are arranged in the rectifying section 15 and used for rectifying the reactor, and two atmosphere gas inlet holes 4 are symmetrically formed in the rectifying section 15 and used for introducing atmosphere gas. The specific reaction gas rectification process is as follows: the reaction gas is introduced into the front end of the reactor through two reaction gas inlet holes 16 which are symmetrical front and back, and the gas hits the wall in the closed space in the shape of the Chinese character 'hui', so that the large vortex formed by the positive opposite impact of the gas flow is reduced. The gas then flows into the rectifying section 15 through the long and narrow opening at the front end of the back-shaped structure, and fully develops, and then flows through the honeycomb ceramics 17 to further rectify, so that more uniform reaction gas is formed, and finally flows into the reaction tank 6.
The main function of the reactor body part is to carry out in-situ transient measurement on component concentration and temperature through a tunable diode absorption spectrum technology by carrying out a reaction of pyrolysis/oxidation of plasma auxiliary fuel. As shown in fig. 1, a hole is formed above the vacuum chamber 5, a polytetrafluoroethylene electrode base 9 is installed for fixing and connecting electrode wires, the polytetrafluoroethylene electrode base 9 is connected with the vacuum chamber 5 through a threaded hole B7 additionally provided with a bolt, and the polytetrafluoroethylene electrode base 9 and the vacuum chamber are sealed through a fluororubber ring B8. The tail end of the vacuum cavity 5 is provided with a pressure detection hole 10 for installing a pressure gauge, so that the real-time monitoring of the internal pressure of the vacuum cavity 5 is realized. The front and rear surfaces of the vacuum chamber 5 are symmetrically provided with holes for installing calcium fluoride windows 20 to provide an optical path for laser diagnosis. The flange end cover 22 is additionally provided with bolts through the opened threaded holes D21 and is connected with the vacuum cavity 5, and sealing with the calcium fluoride window 20 is realized by using the fluororubber ring E19. As shown in FIG. 2, the explosion view of the reaction tank 6 in the vacuum chamber 5 is that a rectangular section channel of reaction gas is formed by an upper quartz glass plate 28, a lower quartz glass plate 28, a front ceramic clamping plate 29 and a rear ceramic clamping plate 29, two calcium fluoride mounting holes 33 are respectively formed in the front ceramic clamping plate 29 and the rear ceramic clamping plate 29, and calcium fluoride glass is added to provide an optical path for laser diagnosis. The stainless steel electrode plates 27 are arranged on the ceramic supporting seats 31 on the upper side and the lower side of the reaction tank 6, and the silica gel sheets 32 are additionally arranged between the quartz glass sheets 28 and the stainless steel electrode plates 27, so that the formation of arc at the edges of the electrode plates is prevented, and more uniform and stable low-temperature plasma is generated. The upper ceramic supporting seat 31 and the lower ceramic supporting seat 31 are connected by additionally installing ceramic bolts through threaded holes H34. The whole reaction tank 6 is placed on a stainless steel supporting plate 35, and is inserted into the rectifying section 15 through a rectangular section channel formed by a quartz glass plate 28 and a ceramic clamping plate 29 to realize positioning. The stainless steel supporting plate 35 is connected with the vacuum cavity 5 through the threaded hole G30 additionally provided with a bolt.
The main function of the reactor end is to achieve vacuum environment, venting and visualization. As shown in fig. 1, the front end of the exhaust section 12 is provided with a threaded hole E23, and is additionally provided with a bolt to be connected with the vacuum cavity 5, and the threaded hole E23 and the vacuum cavity are sealed by a fluororubber ring C11. The middle part of the exhaust section 12 is provided with an exhaust hole 24 for connecting a vacuum pump to realize the negative pressure environment inside the reactor. The tail end of the exhaust section 12 is provided with a threaded hole F25, a bolt is additionally arranged on the tail end of the exhaust section to be connected with the window end cover 14, a quartz glass window 26 is additionally arranged between the threaded hole F25 and the window end cover and is sealed through a fluororubber ring D13, and the threaded hole F is used for visually analyzing dielectric barrier discharge characteristics.
As shown in fig. 1 and 2, the working process of the plasma-assisted fuel pyrolysis/oxidation reactor based on in-situ laser diagnosis provided by the invention is as follows:
The reactor is required to be completely sealed and operated in a negative pressure environment, the exhaust hole 24 is connected with a vacuum pump, the vacuum pump is opened before the reaction gas and the atmosphere gas are introduced, and the internal pressure of the vacuum chamber 5 is monitored by a pressure gauge installed above the pressure detection hole 10. When the air in the vacuum cavity 5 is exhausted, after the number of the pressure gauge is stable and is not reduced, the reaction gas and the atmosphere gas are quantitatively introduced according to the experimental working condition, and the opening of the valve of the vacuum pump is reduced, so that the internal pressure of the vacuum cavity 5 is stable under the experimental working condition.
The reaction gas is introduced into the reactor through the reaction gas inlet hole 16 and is rectified through the rectifying section 15 and the honeycomb ceramics 17, so that the reaction gas flow is fully developed, and the gas flowing through the reaction tank 6 is ensured to be uniform and stable. For the liquid fuel, the liquid fuel needs to be completely gasified and then introduced through the reaction gas inlet hole 16, and the whole reactor shell needs to be wound with a heating belt, so that the internal temperature is higher than the boiling point of the liquid fuel. The atmosphere is introduced into the vacuum cavity 5 through the atmosphere air inlet 4 above the rectifying section 15, and the component concentration and the temperature are measured by the tunable diode absorption spectrum in-situ measurement technology, so that the influence of other impurity gases is required to be removed through the atmosphere.
The reactor adopts a high-voltage nanosecond pulse power supply to discharge to generate low-temperature plasma, positive and negative electrodes of the power supply are connected through two holes on a polytetrafluoroethylene electrode base 9 and are respectively connected with a stainless steel electrode plate 27, and the rectangular flat plate double-layer dielectric barrier discharge is realized by setting parameters such as voltage, frequency, pulse width, pulse number and the like of the high-voltage nanosecond pulse power supply. Through the quartz glass window 26, a plasma image can be taken with an ICCD camera, and the discharge characteristics of the device are studied.
The reactor adopts laser diagnosis technology to carry out in-situ measurement, incident laser is injected into the vacuum cavity 5 through the calcium fluoride window 20, then calcium fluoride glass additionally arranged through the calcium fluoride glass mounting hole 33 on the ceramic clamping plate 29 is injected into the reaction tank 6, the incident laser is injected out through the structurally symmetrical windows of the reaction tank 6 and the vacuum cavity 5 through absorption of plasma auxiliary fuel pyrolysis/oxidation products, absorption spectral lines are obtained through receiving by a detector, and component temperature and concentration information in the reaction tank are obtained through carrying out numerical processing on original spectral lines and absorption spectral lines.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The plasma auxiliary fuel pyrolysis/oxidation reactor for in-situ laser diagnosis is characterized by comprising a reactor front end, a reactor main body and a reactor tail end which are connected in sequence;
The front end of the reactor is used for air intake and rectification and comprises an air intake end cover (1) and a rectification section (15) which are connected together, wherein two reaction air intake holes (16) are symmetrically formed in front of and behind the air intake end cover (1) and are used for introducing reaction air into the reactor, honeycomb ceramics (17) are arranged in the rectification section (15) and are used for rectifying the reactor, and two atmosphere air intake holes (4) are symmetrically formed in the upper and lower sides of the rectification section (15) and are used for introducing atmosphere air;
the reactor main body is used for carrying out plasma-assisted fuel pyrolysis/oxidation reaction and carrying out in-situ transient measurement on component concentration and temperature through a tunable diode absorption spectrum technology, and comprises a vacuum cavity (5) connected with a rectifying section (15), an opening is formed above the vacuum cavity (5), and a polytetrafluoroethylene electrode base (9) is arranged for fixing and connecting an electrode wire; the front and rear surfaces of the vacuum cavity (5) are symmetrically provided with holes for installing calcium fluoride windows (20) to provide an optical path for laser diagnosis; a reaction tank (6) is arranged in the vacuum cavity (5);
The end of the reactor is used for realizing vacuum environment, exhaust and visualization;
the reaction tank (6) comprises a rectangular section channel formed by an upper quartz glass sheet (28) and a lower quartz glass sheet and a front ceramic clamping plate (29) and a rear ceramic clamping plate (29), wherein two calcium fluoride mounting holes (33) are respectively formed in the front ceramic clamping plate and the rear ceramic clamping plate (29), and calcium fluoride glass is additionally arranged to provide an optical path for laser diagnosis; the stainless steel electrode plates (27) are arranged on ceramic supporting seats (31) on the upper side and the lower side of the reaction tank (6), a silica gel sheet (32) is additionally arranged between the quartz glass sheet (28) and the stainless steel electrode plates (27), and the upper ceramic supporting seat and the lower ceramic supporting seat (31) are connected together through ceramic bolts; the reaction tank (6) is inserted into the rectifying section (15) through a rectangular section channel formed by a quartz glass sheet (28) and a ceramic clamping plate (29) to realize positioning.
2. The plasma-assisted fuel pyrolysis/oxidation reactor for in-situ laser diagnosis according to claim 1, wherein the air inlet end cover (1) and the rectifying section (15) are connected through threaded holes provided with bolts, and are sealed through a fluororubber ring, so that a sealing area in the shape of a Chinese character 'hui' is formed at the front end.
3. The plasma-assisted fuel pyrolysis/oxidation reactor for in-situ laser diagnosis according to claim 1, wherein a pressure detection hole (10) is formed at the tail end of the vacuum cavity (5) for installing a pressure gauge so as to realize real-time monitoring of the internal pressure of the vacuum cavity (5).
4. The plasma-assisted fuel pyrolysis/oxidation reactor for in-situ laser diagnosis according to claim 1, wherein a flange end cover (22) is arranged on the outer side of the calcium fluoride window (20), the flange end cover (22) is connected with the vacuum cavity (5) through an opened threaded hole added bolt, and sealing with the calcium fluoride window (20) is achieved by using a fluorine rubber ring.
5. A plasma assisted fuel pyrolysis/oxidation reactor for in situ laser diagnostics according to claim 1 wherein the whole reaction cell (6) is placed on a stainless steel support plate (35), the stainless steel support plate (35) being connected to the vacuum chamber (5).
6. The plasma-assisted fuel pyrolysis/oxidation reactor for in-situ laser diagnosis according to claim 1, wherein the end of the reactor comprises an exhaust section (12) connected with the vacuum cavity (5), and an exhaust hole (24) is formed in the middle of the exhaust section (12) and is used for being connected with a vacuum pump to realize a negative pressure environment inside the reactor.
7. The plasma-assisted fuel pyrolysis/oxidation reactor of claim 6, wherein the exhaust section (12) is terminated with a quartz glass window (26) through the window end cap (14) for visual analysis of dielectric barrier discharge characteristics.
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