WO2000060286A1 - Bruleur et four a combustion de combustion et d'hydrolyse a la flamme, et procede de combustion correspondant - Google Patents

Bruleur et four a combustion de combustion et d'hydrolyse a la flamme, et procede de combustion correspondant Download PDF

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Publication number
WO2000060286A1
WO2000060286A1 PCT/JP1999/001821 JP9901821W WO0060286A1 WO 2000060286 A1 WO2000060286 A1 WO 2000060286A1 JP 9901821 W JP9901821 W JP 9901821W WO 0060286 A1 WO0060286 A1 WO 0060286A1
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WO
WIPO (PCT)
Prior art keywords
combustion
group
gas
burner
furnace
Prior art date
Application number
PCT/JP1999/001821
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English (en)
Japanese (ja)
Inventor
Shinichi Kurotani
Original Assignee
Shin-Etsu Chemical Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shin-Etsu Chemical Co., Ltd. filed Critical Shin-Etsu Chemical Co., Ltd.
Priority to EP99912120A priority Critical patent/EP1087177B1/fr
Priority to PCT/JP1999/001821 priority patent/WO2000060286A1/fr
Publication of WO2000060286A1 publication Critical patent/WO2000060286A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/106—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting at the burner outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00016—Preventing or reducing deposit build-up on burner parts, e.g. from carbon

Definitions

  • the present invention relates to a burner for combustion or flame hydrolysis, a combustion furnace, and a combustion method.
  • the solid oxide adheres to the burner body, the vicinity of the burner, and the inside of the combustion furnace.
  • a burner which is hard to deposit can be operated stably continuously for a long period of time, and is capable of efficiently burning or flame-hydrolyzing the above liquid, a combustion furnace provided with the burner, and a burner provided with the burner. And a method for burning the above liquid using the burner.
  • the flammable liquid can be burned in various ways by spraying the flammable liquid into a mist, which is a mixture of fine droplets and a gas, or by evaporating it and supplying it to an incinerator.
  • a mist which is a mixture of fine droplets and a gas
  • incinerator There is a known method for burning by mixing with solids such as sludge, sand and garbage.
  • the method of evaporating using an evaporative burner can be applied to fuels with a boiling point lower than the thermal decomposition point, such as so-called distilled oil such as gasoline, kerosene, and light oil.
  • so-called distilled oil such as gasoline, kerosene, and light oil.
  • residual oil such as heavy oil and tar
  • carbon precipitation due to thermal decomposition there was an inconvenience such as carbon precipitation due to thermal decomposition.
  • the method of combusting and mixing solids has the drawback that there are many restrictions, such as the need for a chemically stable combination of liquids and solids that have no reactivity. there were.
  • the flammable liquids that are generally desired to be burned are listed in the periodic table based on CAS version (F. Albert Cotton & Geoffery Wilkinson: Advanced Inorganic Chemistry, back cover, John Wilkinky). & 1, 2A, 3A, 3B, 4B, 5B, 6B, 7B, 7B, 8 Tribe, 1B, 2B, 3A Group A, group 4A excluding carbon, group A excluding nitrogen, group A excluding oxygen and sulfur (hereinafter collectively referred to as element S), or compounds with high boiling points
  • a method of spray-burning the flammable liquid is often adopted.
  • a hydraulic spray type, a rotary spray type, a flow spray type, a high load combustion type, a radiation type, and the like are known.
  • the S element oxide powder adheres and accumulates on the burner and the wall near the burner.
  • the burner main body or the vicinity of the burner may be used. S element oxide fine particles adhere and accumulate, making it difficult to perform stable combustion for a long period of time. This is because, in the above-described known burner technology in which the object to be treated is a gas, and in the burner in which the object to be treated is a liquid, the concentration of s element oxide fine particles in the furnace space or flame is large. On the other hand, the burner using the liquid to be treated has a very high concentration.
  • the types of combustion furnaces for burning liquids containing element S include grate furnaces, fixed-bed furnaces, rotary hearth furnaces, multi-stage hearth furnaces, rotary kilns, fluidized-bed furnaces, A vertical cylindrical furnace or the like can be used, and an appropriate type is adopted depending on the presence or absence of solids and gases that burn at the same time, their properties and amount.
  • the center tube is configured as a hydraulic spray type, and an outer mixing tube that concentrically surrounds the bracket center tube and supplies air or oxygen and an external mixing type that has a flame stabilizer in front of the center tube
  • a liquid containing a silicon compound hereinafter, referred to as a silicon liquid
  • silicon dioxide powder begins to adhere to the surface of the flame stabilizer and the inner wall of the furnace.
  • the powder sinters to form a hard porous glass. This glass-like material prevents good spraying and reduces the volume of the combustion chamber and changes the shape of the combustion chamber, losing the stability of the flame. Or, it leads to blockage of the combustion chamber and misfire.
  • the present invention provides a liquid waste containing an S element-containing compound, in which, when the S liquid is sprayed and burned, the S element oxide does not easily adhere to and deposit on the burner body or in the vicinity of the burner, and can be stably operated continuously for a long period of time. It is an object of the present invention to provide a burner capable of efficiently combusting or flame-hydrolyzing a flammable liquid such as the above, a combustion furnace provided with the burner, and a method for burning the above liquid using the parner.
  • the present invention provides a burner, A furnace and a combustion method are provided.
  • a central tube that ejects a liquid containing an element that generates a solid oxide by combustion or flame hydrolysis, and a concentric supporting gas and / or a non-flammable gas that is arranged outside the central tube
  • a first outer tube for discharging a combustible gas and / or a non-combustible gas concentrically arranged on the first outer tube, and, if necessary, the second outer tube.
  • a concentric multi-tube structure consisting of a triple tube or more multi-tubes, comprising a flow passage for supplying a combustible gas and a no or non-combustible gas disposed outside the outer tube.
  • the liquid ejected from the central pipe is spray-combusted with the supporting gas and / or the non-combustible gas supplied from the outer pipe group and, if necessary, the flow path arranged outside thereof, and The generated flame is supplied from the outer tube group and, if necessary, from the flow path arranged outside thereof.
  • PANA one to prevent by that closure combustion raw formed product, wherein that you have the power sale by covering with retardant Pneumatic fluid and / or non-flammable gases.
  • the element that forms a solid oxide by combustion or flame hydrolysis is silicon
  • the ejection speed of the liquid from the central pipe is 5 to 250 m. / Sec
  • the jet velocity of the gas from the first outer pipe is 1 to 250 m / sec
  • the jet velocity of the gas from the second outer pipe is 1 to 25 m / sec. 0 mZ second
  • a burner tile is provided outside the second outer tube, and the amount of the supporting agent with respect to the burnable material is stoichiometric.
  • the element that produces a solid oxide by combustion or flame hydrolysis is silicon, and a spray mechanism is provided at the tip of the central tube.
  • the tip of each outer tube that concentrically surrounds the parent tube of the parenthesis projects at a position flush with the tip of the above-mentioned core tube or forward from this, and if necessary.
  • a flame stabilizer is arranged in front of the central pipe, and the burner is capable of ejecting the liquid from the central pipe at a speed of 5 to 250 mZ seconds.
  • the gas ejection speed is 1 to 250 m / sec, and the amount of the supporting agent to the burnable material is 0.5 to 5.0 times the stoichiometric amount.
  • This combustion furnace may be further equipped with a mechanism for maintaining the surface temperature of the furnace inner wall at 200 to 100 ° C and / or a mechanism for removing solid oxides adhered to the furnace inner wall. I like it.
  • a combustion furnace when spraying a liquid containing an element that produces a solid oxide by combustion or flame hydrolysis to burn or flame hydrolyze, the liquid is ejected from a central tube and the outside thereof.
  • Spray-combustion is performed by using the concentric outer tube group provided in the gas turbine and, if necessary, the combustible gas and / or non-combustible gas blown out from the flow channel provided outside.
  • the flame is covered with the supporting gas and Z or non-combustible gas supplied from the outer tube group and the flow path provided further outside as necessary, and the surface temperature of the inner wall of the combustion furnace is reduced by the solid oxide.
  • Melting point or its solid A combustion method characterized by carrying out a treatment for keeping the temperature lower than the deposition temperature and / or a treatment for removing solid oxides adhered to the furnace inner wall.
  • the element that forms a solid oxide by combustion or flame hydrolysis is silicon, and the surface temperature of the furnace inner wall or the surface temperature of the solid oxide attached to the furnace inner wall is 2 It is preferred that the temperature be kept at 100 to 100 ° C.
  • the flame generating burner body has a multi-tube structure, and is formed by spraying a liquid containing the S element-containing compound.
  • the flame is covered from the outside with a combustible gas such as air or oxygen or a non-combustible gas such as nitrogen containing these combustible gases, and the flow and mixing of the flame and the combustion gas present in the furnace are restricted.
  • a combustible gas such as air or oxygen or a non-combustible gas such as nitrogen containing these combustible gases
  • the mechanism that keeps the end of the internal circulation flow away from the end of the multi-tube prevents the element S oxide entrained in the internal circulation flow from approaching the burner and the vicinity of the burner. I can do it. Therefore, in the present invention, it is possible to prevent the S element oxide generated by the combustion or flame hydrolysis of the liquid from adhering and depositing or melting and solidifying near the burner and the burner. It is something.
  • the S liquid ejected from the central pipe is supplied to the fine liquid by the combustion supporting gas such as air and oxygen ejected from the first outer pipe.
  • the combustion supporting gas such as air and oxygen ejected from the first outer pipe.
  • Sprays and burns as droplets, and the flame that emerges from the second or subsequent outer tube is a nonflammable gas containing air or oxygen, or a nonflammable gas containing this nonflammable gas.
  • Air and oxygen through the gap between the outer burner tile and the non-flammable gas to cover the entire flame with airflow. is there. Therefore, the flame may be covered by air, oxygen or other combustible gas, or nitrogen or other non-combustible gas injected from the gap between the second or subsequent outer tube and the burner tile.
  • the burner according to the present invention is hardly adhered and deposited with the S element oxide in the burner main body or in the vicinity of the burner, can be stably operated continuously for a long period of time, and has a waste containing the s element containing compound. It is possible to efficiently burn such liquids.
  • the concentration of S element oxide in the gas near the burner body and the wall near the burner can be suppressed to a low level.
  • the flame stabilizer may be used.
  • the spray does not reach the spray port at the tip of the core tube located behind the flame holder, maintaining a good spray without changing the spray condition. can do.
  • the S element oxide adhering to the surface of the flame holder is cooled by air or oxygen or other combustible gas or nitrogen or other non-combustible gas ejected from the first outer tube.
  • the combustion furnace according to the preferred embodiment described above has a mechanism for keeping the temperature of the inner wall lower than the temperature at which the oxide of the S element is melted or fixed, thereby oxidizing the S element generated by the combustion. Even if the material powder adheres to the inner wall, By removing the adhering powder from the combustion system by a mechanism that removes the adhering powder from the wall surface. It is intended to prevent the S element oxide powder from adhering to and accumulating on the inner wall of the furnace, thereby enabling stable combustion to be continued.
  • a method of spraying water into the combustion chamber is effective, and the wall is cooled by a coolant circulation such as a water-cooled wall structure.
  • a coolant circulation such as a water-cooled wall structure.
  • a method of removing the powder from the inner wall As a method of removing the powder from the inner wall, a method of providing a movable scraper in the wall and a method of providing a stow blower are effective.
  • solid oxides are less likely to adhere and accumulate on the burner body and in the vicinity of the burner, so that the solid oxides adhering to the furnace inner wall can be easily removed and removed outside the system. It enables efficient combustion of liquids such as waste containing S elements.
  • burners and combustion furnaces that have been conventionally used for combustible liquids may differ in the type of burner and combustion furnace used, regardless of the type of fuel oil (for example, kerosene or heavy oil).
  • fuel oil for example, kerosene or heavy oil.
  • silicon dioxide generated in the flame is generated near the flame. Entrained by the external recirculation flow and the internal recirculation flow generated inside the flame, it is easy to approach the solid wall from near the injection port to the inside of the furnace.
  • the silicon dioxide generated by the combustion at this time easily adheres and deposits on the solid wall surface because both the cohesive force and the adhesive force are strong.
  • the vicinity of the burner and the furnace wall are exposed to high temperatures due to the effects of radiant heat, etc. This is often the case.
  • the external recirculation flow and the internal recirculation flow entrain silicon dioxide in the same manner as in the case of the above-mentioned double tube burner.
  • silicon dioxide deposits or adheres to the solid wall from near the burner and the burner to the inside of the furnace.
  • a flame stabilizing device may be placed inside the furnace in front of the injection port to stabilize the flame, or at a position surrounding the burner in the furnace. Burner tiles are often placed, but the outlet is protected even if it is protected because the end of the internal recirculation flow passes through the flame stabilizer or a part very close to the burner tile. The silicon dioxide was deposited and melted or solidified on the flame or the burner tile, and the adhesion of silicon dioxide to the furnace inner wall could not be suppressed.
  • the burner of the present invention when combusting a combustible liquid containing a silicon-containing compound, adheres and deposits silicon dioxide to the burner even after elapse of 100 hours or more after the start of combustion. No combustion occurs, and combustion can be completely stabilized and continued.Therefore, there is no need to perform a primary stop operation of combustion for cleaning or a diluting operation to reduce the frequency of cleaning, so that combustion of silicon-containing compounds is not required. By resolving the above-mentioned inconveniences, workability and economy can be significantly improved.
  • the liquid when spraying, burning or flame-hydrolyzing a liquid containing an element that generates a solid oxide by combustion, the liquid is contained in the burner body, in the vicinity of the burner, and in the combustion furnace. Solid oxides are less likely to adhere and deposit, can be operated stably continuously for a long period of time, and can efficiently combust flammable liquids such as waste containing silicon-containing compounds.
  • FIG. 1 is a schematic view of one embodiment of the burner of the present invention.
  • FIG. 2 is a perspective view of the main part of the example.
  • FIG. 3 is an enlarged flat cross-section of part A of the burner in Fig. 1.
  • FIG. 4 is a plan view showing a cross section of a part of another embodiment of the burner used in the present invention.
  • FIG. 5 is a perspective view of the flame stabilizer of the same example.
  • FIG. 6 is a schematic view showing one embodiment of the combustion furnace of the present invention.
  • the burner of the present invention sprays a flammable liquid containing a silicon-containing compound in a combustion furnace by droplet spraying.
  • the burner body for flame generation has a concentric multi-tube structure consisting of at least a triple tube.
  • the flame ejected from the outer tube is covered by a gas jet ejected from the outer tube, so that the flow and mixture of the flame and the combustion gas in the combustion furnace are restricted.
  • the above-mentioned flammable liquids to be used for combustion include tetramethyl silane, hexane methyl disiloxane, hexane methyl silane, and the like.
  • Liquid silicon such as silane, siloxane, silazane, etc., and liquids such as silicone varnish containing these liquid organic silicon compounds. it can .
  • liquids such as cleaning liquid for silicon production equipment, distillation fractions and residues in silicon production can be used for combustion.
  • examples of the supporting gas ejected from the outer tube include air, oxygen, and the like.
  • the center tube that ejects the combustible liquid concentrically surrounds the center tube. It is preferable that dry air and oxygen are ejected from the outer tube 1 and that the second outer tube surrounding the first outer tube can be dried air or oxygen. It is sufficient to blow normal air that is not applied.
  • the second A third or more outer pipes may be further concentrically arranged outside the outer pipe of the above, but these outer pipes also have the same combustion supporting gas as the above-mentioned second outer pipe. Can be blown out.
  • a non-combustible gas such as nitrogen can be ejected together with the above-mentioned supporting gas or in some cases instead of the supporting gas.
  • the first outer tube blows out a supporting gas such as air or oxygen
  • the second outer tube blows out or contains the supporting gas from the second outer tube. It is preferable to eject a nonflammable gas, and in some cases, only a nonflammable gas may be ejected.
  • both the first outer pipe and the second outer pipe eject a nonflammable gas containing a supporting gas or a non-flammable gas.
  • the gas ejection speed from the first and second outer tubes is l to 250 m / sec.
  • the velocity of gas emission from the space between the outermost outer tube and the burner ring should be 5 to 100 m / sec when using air. I like it.
  • the method of spraying the liquid in the center tube of the multi-tube need only have a mechanism for mixing the liquid with a gas to obtain a mist-like mixture of droplets and the gas. It is possible to select any type, such as a rotary type, a rotary type, and an air spray type, regardless of the type.
  • the silicon liquid is jetted from the central pipe of the multi-tube, and the generated flame is jetted from the outer pipe. It is necessary to form a silicone liquid from a location other than the central pipe, for example, the first or second outer pipe.
  • FIGS. 1 to 3 show examples of the nozzle of the present invention in which the central pipe for ejecting liquid is of an external mixing type air flow spraying type.
  • the central pipe 1 for ejecting liquid and the central pipe 1 A burner body consisting of outer tubes 2 and 3 for ejecting the first and second oxidizing gas and Z or non-combustible gas, which are arranged concentrically, is provided on the outside of the center tube 1.
  • the outer tube 2 has a structure in which the tip of the inner tube 2 protrudes more than the tip of the outer tube 3.
  • a flammable liquid, a flammable gas such as air and oxygen, and a non-flammable gas such as Z or nitrogen are supplied to the central pipe 1 and the outer pipes 2 and 3 from a fluid supply port 5.
  • a burner tile 4 is arranged so as to surround the outer tube 3, which is the outermost tube, and the tip of the burner body is located on the inner side of the furnace at the end of the furnace. It is located before the end face (inward of the burner tile).
  • air or the like is supplied from an air inlet 8 to a flow passage 7 having a wind box 6 (between a burner tile 4 and a second outer pipe 3). Things.
  • FIG. 3 is a partial schematic cross-sectional view of the tip of the multi-tube of the burner shown in FIG. 1.
  • the flammable liquid flow path 9 is provided in the central pipe 1 and the outer pipes 2 and 3 are provided respectively.
  • the gas passages 10 and 11 are formed.
  • the burner of the present invention as shown in FIGS. 1 to 3 has the following structure.
  • each outer pipe surrounding the spraying part should be such that the outer pipe is retracted backward from the inner pipe, or the tip of each outer pipe is flush with the tip of the spraying part. It is preferred to be distributed.
  • the shape of the distal end of each tube is preferably narrowed down toward the distal end, or a parallel cylindrical shape or a combination of them, and not preferably a shape that expands toward the distal end.
  • the shape of the burner tile is preferably widened toward the inside of the combustion furnace, parallel or a combination of them.
  • the thickness of the tip of each pipe shall be sharpened so as to become thinner toward the tip, or shall be a fixed thickness, or a combination of both, and shall be toward the tip. It is preferable not to make the shape thicker.
  • the tip of the multi-pipe is positioned so as to be in front of or on the same plane as the end face of the burner tile on the combustion furnace side, and does not protrude into the furnace.
  • the flow rates of the supporting gas and the non-flammable gas for covering the flame are sufficient to shut off the flame and the combustion gas present in the combustion furnace. It is preferable to secure an appropriate flow rate that is equal to or greater than that and does not become excessive so as to inhibit combustion.
  • the minimum amount of oxygen (stoichiometric amount) required for complete combustion of the above flammable liquid must be supplied. Not surprisingly.
  • the jet velocity of the liquid from the central pipe is 5 to 250 m / sec
  • the jet velocity of the gas from the first outer pipe is 1 to 2 m / s. 5 O m Z seconds
  • the gas ejection velocity from the second outer tube is preferably 1 to 250 m / s
  • the gas from the space between the outermost outer tube and the burner tile is more preferable.
  • the jet velocity of the air is 5 to 10 Om / sec when using air.
  • the outer tube group and the The amount of fuel supplied between the burner and the burner tile is stoichiometric.
  • the liquid is ejected at a temperature and a pressure that do not reach the boiling point at the above-mentioned flow rate, and the liquid is supported from the first outer pipe at the above-mentioned flow rate at 0 to 30 ° C.
  • the above-mentioned liquid is sprayed by ejecting the flammable gas and / or the non-flammable gas, and the sprayed material is discharged from the second and subsequent outer tubes, and further between the burner tile and the outer tube. It burns with these supporting gases and non-combustible gases and covers the flame. It is preferable that the temperature of the combustible gas and / or the noncombustible gas ejected from the second and subsequent outer tubes, between the burner tile and the outer tube be 0 to 30 ° C.
  • the combustion furnace of the present invention has a cooling mechanism for keeping the temperature of the inner wall within a required range and a removing mechanism for removing solid matter attached to the inner wall, and the oxide generated by the combustion by the burner described above.
  • the oxide powder is kept at a temperature lower than its sintering temperature or melting point, maintains a state in which it can be easily removed, and operates a removing mechanism periodically. In this way, the powder is removed as it is from the system as it is.
  • the wall is formed by a refrigerant circulation structure such as a water-cooled wall structure, or by a cool air supply.
  • a refrigerant circulation structure such as a water-cooled wall structure, or by a cool air supply.
  • the soot opening ⁇ is effective, a method of installing a movable scraper in the furnace, and made of heat-resistant material such as iron or ceramic along the wall
  • the temperature of the furnace inner wall for example, when burning a compound containing silicon, it is preferable to keep the temperature at 200 to 100 ° C.
  • the temperature is preferably 500 ° C or higher, at which spontaneous ignition of organic substances occurs.
  • the crystal transformation from quartz to tri-dimension is required. It is preferable to set the temperature to 850 ° C or less, which can suppress the occurrence of the occurrence.
  • FIG. 4 shows an example of the burner of the present invention in which the central pipe for ejecting liquid is of a hydraulic spray type, and has a concentric multi-pipe structure in which the burner main body for flame generation is a triple pipe. is there .
  • the burner body includes a liquid discharge center tube 21 and a non-combustible gas containing the first and second combustion-supporting gas or the combustion-supporting gas concentrically outside the center tube 21, respectively.
  • Outer pipes 22 and 23 are provided for ejecting flammable gas.
  • Liquid is supplied to the center pipe 21 from a flammable liquid supply port 14, and first and second outer pipes 22 and 23 are provided.
  • a supporting gas such as air and oxygen and a non-combustible gas such as Z or nitrogen are supplied to 23 from gas supply ports 15 and 16 respectively.
  • a flame stabilizer 17 is disposed at the inner end of the first outer tube 22 in front of the center tube 21. As shown in Fig. 5, the shape of this flame stabilizer is a conical plate with a hole 17a at the center, with multiple holes or multiple blades or protrusions as necessary. It is necessary to allow the fog erupted from the rear to pass forward through this hole 17a.
  • the hydraulic spray burner of the present invention as shown in FIG. 4 has the following structure.
  • the outer tube protrudes forward (spouting direction) from the inner tube, or the end of each outer tube is flush with the center tube end. It is preferred that they are arranged in such a way that
  • the shape of the tip of each pipe should be narrowed down to the tip or It is preferable that the shape is a parallel cylindrical shape or a shape combining them, and not a shape that expands toward the tip.
  • flame stability is considered due to the characteristics of the combustibles and the operating conditions of the combustion furnace. If it is highly likely that they will not be placed.
  • the thickness of the tip of each pipe shall be sharpened so as to become thinner toward the tip, or shall be a fixed thickness, or a combination of both, and shall be toward the tip. It is preferable not to make the shape thicker.
  • the flow rate of the supporting gas and / or the non-flammable gas for covering the flame is sufficient or sufficient to shut off the flame and the combustion gas present in the combustion furnace. It is preferable to secure a flow rate that is larger than this and that is not excessive so as not to hinder combustion. Also, in order to maintain the flame continuously and maintain good combustion, the minimum amount of oxygen (stoichiometric amount) required for complete combustion of the flammable liquid must be supplied. This is natural.
  • the flammable liquid jet velocity from the central pipe is preferably 5 to 250 m / sec, and particularly preferably 5 to 50 m / sec for a hydraulic spray type.
  • the ejection velocity of gas from the first and second outer pipes is preferably 5 to 50 m / sec in the case of a hydraulic spray type.
  • the amount of the combustion supporting agent supplied from between the outer tube group and the burner tile to the material to be squirted from the central tube is 0.5 to 5.0 times the stoichiometric amount. In order to keep the flame stable, it is more preferable to set it to about 0.8 to 2.0 times.
  • the supporting gas and the Z or noncombustible gas are discharged from the first outer tube at the above-mentioned flow rate of 0 to 30 ° C.
  • the above liquid is sprayed, and the sprayed matter is burnt with the supporting gas and Z or non-flammable gas from the second and subsequent outer tubes, and further between the burner tile and the outer tube. , And covers the flame.
  • the temperature of the combustible gas and / or the non-combustible gas ejected from the second and subsequent outer pipes, between the burner tile and the outer pipe be 0 to 30 ° C.
  • Fig. 6 shows a combustion furnace according to the present invention, in which an upper part is provided with a hydraulic spray type triple pipe burner, a temperature control water spray nozzle, and a drive mechanism for a movable scraper, and a body part is provided with a movable blower. It is an example of a cylindrical vertical furnace equipped with a scraper.
  • a parner having a central pipe 21 and outer pipes 22 and 23 as shown in Fig. 4 is arranged at the upper part of the furnace main body 18, and the S liquid and air Alternatively, by supplying and igniting a supporting gas such as oxygen, the S liquid is burned, and solid oxides are generated in the furnace body 18.
  • a water spray nozzle 19 for cooling is provided on the wall of the furnace body 18, and water is sprayed from the nozzle 19 to lower the combustion temperature in the furnace body 18 to the S element. Combustion is continued while keeping the oxides within the range where they do not melt or sinter.
  • a soot blower 24 is installed in an appropriate arrangement on the wall of the furnace body 18 on which the oxide powder of S element generated by combustion adheres and accumulates. By operating the blower 24 periodically at predetermined intervals, the oxide powder of element S is blown off the wall and burned from the lower exhaust port 25 of the furnace body 18. It is discharged together with the gas.
  • Reference numeral 26 denotes a circular ring-shaped movable scraper, which is normally disposed in the upper part of the furnace main body 18, and the scraper 26 is provided via a chain 27. It is connected to a drive mechanism 28 provided outside the furnace body 18, and the drive of the drive mechanism 28 causes the tune 27 to be wound around the drive mechanism 28 or The scraper 26 is extended so that the scraper 26 can slide on the inner peripheral wall of the furnace body 18 along the vertical direction, and is removed by the soot blower 24. Furnace body 18 not attached This removes the oxide powder of S element deposited and deposited on the wall.
  • FIG. 6 shows a configuration in which a flame is held by a burner and a flame stabilizer without using a burner tile, but a burner tile is provided as described above. You can also.
  • a water spray method is exemplified as a method of controlling the temperature in the furnace.
  • a mechanism for maintaining the inner wall surface at a temperature at which the powder of the S element oxide does not melt or sinter is used. If so, the method is not limited, and a method such as direct cooling of a water cooling wall or the like and supply of cold air may be used.
  • a method for removing the S element oxide from the inner wall a combination of a stove blower and a movable scraper is exemplified, but in these cases, as described above, the inner wall surface is also used.
  • the method is not limited as long as the mechanism removes the powder, and a method of dropping a heat-resistant sphere from above or a method of vibrating the entire furnace may be used.
  • the furnace type is exemplified by a vertical cylindrical furnace which burns only a liquid containing an S element-containing compound, but at the same time, other solid and Z or liquid are burned into the combustion furnace.
  • a vertical cylindrical furnace which burns only a liquid containing an S element-containing compound, but at the same time, other solid and Z or liquid are burned into the combustion furnace.
  • an appropriate form may be adopted, and the form is not limited as long as it has the following mechanism of the present invention.
  • the combustion furnace of the present invention as shown in FIG. 6 has the following structure.
  • a mechanism is provided to maintain the temperature of the inner wall surface lower than the melting point or sintering temperature of the S element oxide powder.
  • First outer tube (made of stainless steel): inner diameter 20 mm, outlet diameter 8 mm
  • Second outer tube (made of stainless steel): inner diameter 32 mm, outlet diameter 28 mm (2) Fluid ejected from each pipe, ejection volume, and temperature
  • the second outer pipe air (5 0 N m 3 / h ), 2 0 ° C
  • Example 2 Using the same burner as in Example 1 except that only the second outer tube was removed to obtain a double-tube structure, and burning tetramethyl silane under the same conditions as in Example 1 was performed.
  • Example 1 As a result of performing the combustion reaction under the above conditions, the same result as in Example 1 was obtained, and the silicon dioxide did not adhere, and stable combustion could be continued.
  • Center tube (made of stainless steel): Inner diameter 4 mm, tip has pressure spray spray structure, outlet diameter 0.2 mm
  • First outer tube (made of stainless steel): inner diameter 4 5 mm
  • Second outer tube (made of stainless steel): Inner diameter 54 mm
  • Flame stabilizer (made of stainless steel): caliber 1 O mm, outer diameter 40 mm,
  • Furnace top (300 mm from top): 850 ° C
  • Cylindrical outer diameter 180 mm, height: 30 mm, plate thickness: 5 mm
  • Cooling water spray nozzle (made of stainless steel):
  • the tip is 200 mm from the furnace top
  • Sootblower interval every 20 minutes
  • the burner and its vicinity (the surface of the flame stabilizer, the tips of the first and second outer tubes (both with a thickness of 2 mm), and the second outer tube) And the silicon dioxide powder thinly adhered to the straight body of the part 500 mm from the upper part in the combustion furnace.
  • Example 2 The same burner as in Example 2 was used except that only the second outer tube was removed to obtain a double-pipe structure, and the same conditions as in Example 2 were used. Combustion was performed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

L'invention concerne un brûleur destiné à éviter l'encrassement que peuvent former les produits de combustion. Ledit brûleur est caractérisé en ce qu'il comprend une structure à plusieurs tuyaux concentriques constituée de trois tuyaux au moins, dont un tuyau central pour propulser un liquide contenant des éléments générant des oxydes solides par combustion ou hydrolyse à la flamme, un premier tuyau extérieur disposé concentriquement à l'extérieur du tuyau central, et conçu pour propulser un gaz favorisant la combustion et/ou un gaz non combustible, un second tuyau extérieur disposé de façon concentrique par rapport au premier tuyau extérieur, et conçu pour propulser un gaz favorisant la combustion et/ou un gaz non combustible, et le cas échéant, un chemin d'écoulement, disposé à l'extérieur du second tuyau extérieur, et conçu pour assurer l'alimentation en gaz favorisant la combustion et/ou en gaz non combustible. Ledit brûleur est également caractérisé en ce que le liquide propulsé du tuyau central est atomisé et brûlé par le gaz favorisant la combustion et/ou le gaz non combustible fourni par le groupe constitué des tuyaux extérieurs et, le cas échéant, du chemin d'écoulement disposé à l'extérieur des tuyaux extérieurs, et en ce que la flamme générée est couverte par le gaz favorisant la combustion et/ou la gaz non combustible fourni par le groupe constitué des tuyaux extérieurs, et le cas échéant, du chemin d'écoulement disposé à l'extérieur des tuyaux extérieurs.
PCT/JP1999/001821 1999-04-06 1999-04-06 Bruleur et four a combustion de combustion et d'hydrolyse a la flamme, et procede de combustion correspondant WO2000060286A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99912120A EP1087177B1 (fr) 1999-04-06 1999-04-06 Bruleur et four a combustion de combustion et d'hydrolyse a la flamme, et procede de combustion correspondant
PCT/JP1999/001821 WO2000060286A1 (fr) 1999-04-06 1999-04-06 Bruleur et four a combustion de combustion et d'hydrolyse a la flamme, et procede de combustion correspondant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1999/001821 WO2000060286A1 (fr) 1999-04-06 1999-04-06 Bruleur et four a combustion de combustion et d'hydrolyse a la flamme, et procede de combustion correspondant

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09646536 A-371-Of-International 2000-09-19
US10/857,880 Division US20040216494A1 (en) 2000-09-19 2004-06-02 Burner for combustion or flame hydrolysis, and combustion furnace and process

Publications (1)

Publication Number Publication Date
WO2000060286A1 true WO2000060286A1 (fr) 2000-10-12

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Country Status (2)

Country Link
EP (1) EP1087177B1 (fr)
WO (1) WO2000060286A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2889578B1 (fr) * 2005-08-04 2007-09-21 Air Liquide Procede de combustion d'un combustible liquide a atomisation etagee
WO2011016800A1 (fr) * 2009-08-03 2011-02-10 Dow Global Technologies Inc. Ensemble buse d’atomisation destiné à être utilisé avec un appareil à lit fluidisé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997022553A1 (fr) 1995-12-19 1997-06-26 Corning Incorporated Procede et dispositif servant a obtenir du verre de silice par combustion de reactifs liquides
JPH10249143A (ja) * 1997-03-13 1998-09-22 Nippon Sanso Kk 排ガスの処理方法
JPH10265480A (ja) * 1997-03-26 1998-10-06 Shin Etsu Chem Co Ltd シラン類含有ガスの処理方法
EP0978487A2 (fr) 1998-08-07 2000-02-09 Corning Incorporated Bruleur à bec étanche et sans premelange pour le dépot de verre de silice

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5523067A (en) * 1978-08-07 1980-02-19 Nippon Telegr & Teleph Corp <Ntt> Forming method for oxide powder layer for optical fiber
JPH04362034A (ja) * 1991-06-05 1992-12-15 Sumitomo Electric Ind Ltd ガラス微粒子堆積体の製造方法
US5743723A (en) * 1995-09-15 1998-04-28 American Air Liquide, Inc. Oxy-fuel burner having coaxial fuel and oxidant outlets

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997022553A1 (fr) 1995-12-19 1997-06-26 Corning Incorporated Procede et dispositif servant a obtenir du verre de silice par combustion de reactifs liquides
JPH10249143A (ja) * 1997-03-13 1998-09-22 Nippon Sanso Kk 排ガスの処理方法
JPH10265480A (ja) * 1997-03-26 1998-10-06 Shin Etsu Chem Co Ltd シラン類含有ガスの処理方法
EP0978487A2 (fr) 1998-08-07 2000-02-09 Corning Incorporated Bruleur à bec étanche et sans premelange pour le dépot de verre de silice

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1087177A4 *

Also Published As

Publication number Publication date
EP1087177A1 (fr) 2001-03-28
EP1087177B1 (fr) 2011-12-28
EP1087177A4 (fr) 2002-08-21

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