JP5878420B2 - Wall radiant burner - Google Patents

Description

  The present invention relates to a wall surface radiation type burner capable of heating a treatment material more uniformly.

  The burner for heating the treatment material is, for example, a burner that generates a flame substantially parallel to the treatment material from the furnace wall located on the side of the treatment material toward the treatment material. What heats is known. In such a burner, fuel is ejected radially to form a conical flame. That is, since the cross-sectional shape of the flame is substantially circular, the heating condition is different between the portion near the flame and the portion away from the flame in the treatment material, and it is difficult to heat the treatment material uniformly.

  With respect to such a problem, Patent Documents 1 and 2 disclose an apparatus that spreads a flame in order to form a flat flame with a thin thickness and heat the treatment material.

  Patent Document 1 “A device for expanding a frame and a furnace using this device” has a main nozzle for guiding a main jet flow composed of one of combustion gas and combustion support gas, and flows around the main jet flow, and is substantially constant. Secondary nozzle that guides the secondary jet flow consisting of the other of combustion gas and combustion support gas, and deflects the secondary jet flow by sucking the secondary jet flow into the main jet flow by the Coanda effect And a curved surface arranged tangentially to the secondary jet stream so as to mix the secondary jet stream and the main jet stream to form a frame.

  Patent Document 2 “Walking Beam Type Metal Heating Furnace with Slit Nozzle Burner or Slit Nozzle Regeneration Burner” is a slit nozzle type burner or slit nozzle type regenerative burner having a flat burner flame. To build a new walking beam metal heating furnace with a total height of about 2,500 mm and a low height, low construction costs and energy saving.

JP-A-8-178230 Japanese Patent Laid-Open No. 10-183235

  However, it is difficult to form a thin flat flame. Moreover, it is difficult to heat the treatment material so that the heat distribution becomes uniform simply by forming a flat and flat flame and heating the treatment material.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a wall surface radiant burner capable of heating a treatment material more uniformly.

  The wall surface radiant burner according to the present invention discharges a first opening that blows an air flow of combustion air that produces a Coanda effect to a furnace body element that forms a radiant wall surface facing a treatment material, and exhausts exhaust gas after combustion. A second opening and a plurality of third openings that are disposed between the first opening and the second opening and blow out the fuel are formed, and are blown out from the first opening and the above-mentioned of the furnace element. Dispersing and supplying the fuel from the plurality of third openings to the air flow of the combustion air that travels along the radiation wall toward the second opening, thereby causing the radiation wall to flow along the radiation wall. A flat flame to be heated is generated, and the treatment material is heated by radiant heat from the radiant wall surface.

  Further, the wall surface radiation type burner according to the present invention alternately switches the blowing of the air flow of combustion air that causes the Coanda effect and the discharge of exhaust gas after combustion to the furnace body element that forms the radiation wall surface facing the treatment material. Forming the first opening and the second opening, and a plurality of third openings arranged between the first opening and the second opening and for blowing out the fuel, the first opening And a plurality of the air flows of the combustion air that are blown out from any one of the first opening and the second opening toward the other one of the first opening and the second opening along the radiation wall surface of the furnace body element. The fuel is dispersed and supplied from the third opening to generate a flat flame that heats the radiant wall along the radiant wall, and the treatment material is heated by radiant heat from the radiant wall. Features.

  A heat accumulator is connected to the first opening and the second opening via a flow path. The heat accumulator burns with the exhaust gas in order to store the heat of the exhaust gas and heat the combustion air. The working air is circulated alternately.

  The third opening may be formed in a direction along a flow direction of the air flow of the combustion air in order to supply fuel along the air flow of the combustion air.

  The third opening is formed in a direction opposite to the flow of combustion air in order to supply fuel in a direction opposite to the flow of combustion air. .

  The plurality of third openings are formed as a pair of two facing each other in the opposite direction with respect to the flow direction of the air flow, and the blowout of the air flow and the exhaust gas are performed at the first opening and the second opening. According to the fact that the switching of the discharge is performed alternately, the fuel is blown out from the third opening in either direction.

  The plurality of third openings distribute and supply fuel.

  The third opening is formed in a form in which the flow of fuel blown out causes a Coanda effect.

  At least one of the first opening and the second opening that blows out the air flow of combustion air is disposed behind the first opening and the second opening, and a flame is blown out from at least one of the first and second openings. In order to achieve this, a fuel supply means for mixing fuel in advance with the air flow of the combustion air to be blown out is provided.

  At least the first opening and the third opening are formed in a flat nozzle shape that is long along a direction intersecting the air flow.

  In the wall surface radiation type burner according to the present invention, the treatment material can be heated more uniformly.

It is a longitudinal section showing a 1st embodiment of a wall surface radiation type burner concerning the present invention. It is a bottom view which shows the 1st, 2nd and 3rd opening part provided in the radiation wall surface of the wall surface radiation type burner shown in FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wall surface radiation type burner which concerns on this invention. It is a bottom view which shows the 1st, 2nd and 3rd opening part provided in the radiation wall surface of the wall surface radiation type burner shown in FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wall surface radiation type burner which concerns on this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of the wall surface radiation type burner which concerns on this invention. It is a longitudinal cross-sectional view which shows 5th Embodiment of the wall surface radiation type burner which concerns on this invention. It is an enlarged view of the 3rd opening part of the wall surface radiation type burner shown in FIG. It is a longitudinal cross-sectional view which shows 6th Embodiment of the wall surface radiation type burner which concerns on this invention. It is an enlarged view of the 3rd opening part of the wall surface radiation type burner shown in FIG. It is a longitudinal cross-sectional view which shows 7th Embodiment of the wall surface radiation type burner which concerns on this invention. It is a bottom view which shows another embodiment of the 1st, 2nd and 3rd opening part provided in the radiation wall surface of the wall surface radiation type burner which concerns on this invention.

  Hereinafter, preferred embodiments of a wall surface radiation type burner according to the present invention will be described in detail with reference to the accompanying drawings. The wall surface radiant burner 1 according to the first embodiment is basically for combustion, as shown in FIGS. 1 and 2, in which a Coanda effect is generated in a furnace body element 8 that forms a radiant wall surface 2 opposite to a treatment material. The first opening 3 that blows out the air flow of the air C, the second opening 4 that discharges the exhaust gas E after combustion, and the fuel gas F are disposed between the first opening 3 and the second opening 4. A plurality of third openings 5 for blowing out the gas flow of the combustion air C of the combustion air C blown out from the first openings 3 toward the second opening 4 along the radiation wall surface 2 of the furnace body element 8 In addition, by distributing and supplying the gas flow of the fuel gas F from the plurality of third openings 5, a flat flame f for heating the radiation wall surface 2 along the radiation wall surface 2 is generated. A treatment material (not shown) is configured to be heated by radiant heat.

  The plurality of third openings 5 distribute and supply the fuel gas F. The first opening 3, the second opening 4, and the third opening 5 are formed in a flat nozzle shape that is long along a direction that intersects the air flow of the combustion air C and the gas flow of the fuel gas F.

  FIG. 1 is a longitudinal sectional view of a wall surface radiant burner 1 according to the first embodiment. FIG. 2 is a bottom view of the wall surface radiation type burner 1 showing the first opening 3, the second opening 4, and the third opening 5 provided in the radiation wall surface 2.

  The furnace body element 8 is formed of a refractory material, and is constructed on a pair of furnace walls 25 to constitute a ceiling of a furnace body such as a heating furnace. The furnace body element 8 faces the inside of the furnace body to form a ceiling surface, and this ceiling surface is formed as the radiation wall surface 2 facing the processing material. The furnace body element 8 has a substantially rectangular parallelepiped shape, and forms a substantially rectangular radiation wall surface 2 whose longitudinal direction is a direction orthogonal to the transport direction of the processing material transported in the heating furnace.

  As shown in FIG. 2, the ceiling surface of the furnace element 8 serving as the radiation wall surface 2 has a first opening 3 and a first opening 3 that form slits along the conveying direction of the treatment material on both ends in the longitudinal direction. Two openings 4 are respectively formed. In the region between the first opening 3 and the second opening 4, a plurality of (four in FIG. 2) three-dimensionally formed third openings 5 having a slit shape along the conveying direction of the processing material are formed. Is done.

  The furnace body element 8 is connected to the first opening 3 to form an air supply passage 9a, connected to the second opening 4 to form an exhaust passage 9b, and is connected to each third opening 5 respectively. Thus, the fuel flow path 10 is formed. From the 1st opening part 3, the airflow of the combustion air C supplied from the air supply flow path 9a blows off toward the inside of a furnace. The second opening 4 connected to the exhaust passage 9b discharges the exhaust gas E after combustion from the furnace by the suction action generated in the exhaust passage 9b. A gas flow of the fuel gas F is blown out from the third opening 5 toward the inside of the furnace through the fuel flow path 10.

  The supply air flow path 9a and the radiation wall surface 2 are connected by a continuous curved surface 11 through the first opening 3, whereby the Coanda effect can be generated in the air flow of the combustion air C. In the illustrated example, the air supply flow path 9a has a straight path 12 in the vertical direction and a curved path 13 connected to the first opening 3 side and curved toward the radiation wall surface 2 side of the furnace body element 8. .

  That is, the air supply flow path 9a goes straight in the up-down direction at the upper part, and is curved toward the second opening 4 side located on the opposite side in the longitudinal direction of the furnace body element 8 at the lower part on the radiation wall surface 2 side. ing. Thereby, the combustion air C is blown out from the first opening 3 along the radiation wall surface 2 in an oblique direction. The air flow of the blown-out combustion air C flows along the radiation wall surface 2 toward the second opening 4 that performs exhaust.

  In this embodiment, the exhaust flow path 9b and the radiation wall surface 2 are connected by the continuous curved surface 11 via the 2nd opening part 3, in order to smooth an exhaustion effect | action.

  The fuel flow path 10 is connected to the third opening 5 by a straight path 15 in the vertical direction, and blows a gas flow of the fuel gas F directly below the radiation wall surface 2. The fuel flow path 10 is provided with an on-off valve 26 that opens and closes to control the supply of the fuel gas F. A plurality of third openings 5 are formed in the radiation wall surface 2, and the gas flow of the fuel gas F is distributed and supplied to the air flow of the combustion air C flowing along the radiation wall surface 2. Yes. By supplying in a distributed manner, gas mixture and flame propagation are promoted.

  Further, in the present embodiment, the fuel gas F is distributed and blown out from the plurality of third openings 5 provided between the first opening 3 and the second opening 4. “Distribute” means that the required amount of fuel gas per unit time is distributed and blown out from the plurality of third openings 5. For example, a plurality of fuel gases F having an appropriate mixing ratio with respect to the combustion air C blown out from the first opening 3 are provided between the first opening 3 and the second opening 4. The amount of fuel gas F allocated to the third openings 5 and distributed from the third openings 5 is distributed and blown out.

  The 1st opening part 3 and the 3rd opening part 5 are formed in the shape of a flat nozzle long along the direction which cross | intersects an air flow or a gas flow. Combustion air C blown out from the long flat nozzle shape, that is, the slit-shaped first opening 3, and fuel gas F blown out from the long flat nozzle shape, that is, the slit-shaped third opening portion 5, both, A thin flat flow is generated.

  The opening areas of the first opening 3 and the second opening 4 are set slightly smaller than the cross-sectional areas of the air supply passage 9a and the exhaust passage 9b, and the opening area of the third opening 5 is the fuel passage 10. Is set to be slightly smaller than the cross sectional area of the first opening 3, the second opening 4 and the third opening 5 in the vicinity of the flow velocity.

  Although not shown, ignition pilot burners and spark plugs are incorporated at appropriate locations on the radiation wall 2.

  The operation of the wall surface radiation type burner 1 according to the first embodiment will be described. The flame f formed by the combustion air C blown from the first opening 3 and the fuel gas F blown from the third opening 5 is a radiation wall surface. The flat flame f is generated while being mixed along the radiation wall surface 2 of the furnace body element 8 by the Coanda effect that acts on the air flow of the combustion air C by the curved surface 11 connected to 2. The flat flame f burns the radiant wall surface 2 of the furnace body element 8, and the entire radiant wall surface 2 is heated to a bright state. Then, the treatment material is heated by the radiant heat from the heated radiant wall surface 2.

  According to the wall surface radiation type burner 1 according to the first embodiment, the air flow of the combustion air C that produces the Coanda effect is blown out from the first opening 3, and the fuel gas from the plurality of third openings 5 is blown into this air flow. Since the gas flow of F is distributed and supplied, the flat flame f along the radiation wall surface 2 can be reliably generated, and the radiation wall surface 2 can be efficiently heated.

  In addition, the air flow of the combustion air C blown out from the first opening 3 with the Coanda effect is generated by the airflow flowing toward the second opening 4 along the curved surface 11 by the suction action of the exhaust passage 9b. Thus, the flat flame f can be appropriately placed along the radiation wall surface 2, and the radiation wall surface 2 can also be efficiently heated by the flat flame f.

  Specifically, an opening is formed in the furnace body element 8 to blow the combustion air C into a flat shape, and the combustion air C is formed in the furnace body element 8 and connected to the first opening 3. Is connected to the curved surface 11, and a plurality of openings are formed in the furnace body element 8, and the fuel gas F is formed in a flat shape. Since the third opening 5 to be blown out and the fuel flow path 10 formed in the furnace element 8 and connected to the third opening 5 and through which the fuel gas F flows are provided, the Coanda effect is provided from the first opening 3. Thus, the air-fuel mixture generated from the combustion air C blown out and the fuel gas F distributed and supplied from the third opening 5 can be reliably aligned with the radiation wall surface 2. For this reason, the flat flame f produced | generated from the air-fuel | gaseous mixture of these combustion air C and fuel gas F can be made to follow the radiation wall surface 2 exactly.

  Then, a flat flame f is generated along the radiation wall surface 2, and a series of airflows are generated in which the exhaust gas E from the flat flame f is sucked into the second opening 4 along the radiation wall surface 2. Since it extends along the radiation wall surface 2 with the air flow, the radiation wall surface 2 can be heated reliably and efficiently.

  At this time, the first opening 3 that blows out the combustion air C and the third opening 5 that blows out the fuel gas F correspond to the air flow of the combustion air C and the direction of the gas flow of the fuel gas F. Since the nozzle is long and flat in the direction intersecting with the gas flow direction, the combustion air C and the fuel gas F can be blown out more flatly and more along the radiation wall 2. A flat flame f can be formed.

  Further, a plurality of third openings 5 through which the fuel gas F is blown out are provided, and the distributed fuel gas F is distributed and supplied from each third opening 5, so that the fuel gas F from each third opening 5 is provided. And the fuel gas F is prevented from penetrating through the air flow of the combustion air C having a flat shape blown out from the first opening 3. For this reason, the fuel gas F can be distributed and supplied without disturbing the flat flame f.

  And since the density nonuniformity of the fuel gas F supplied in the whole area | region of the radiation wall surface 2 is also suppressed, the whole radiation wall surface 2 can be heated efficiently, a solid radiation can be produced, and a processing material can be heated uniformly. Further, since the fuel gas F is supplied in a dispersed manner, it can be burnt slowly, so that the generation of NOx can be suppressed.

  At this time, by controlling the on-off valve 26, the fuel gas F blown out from the plurality of third openings 5 is used for combustion in order from the third opening 5 close to the first opening 3 from which the combustion air C is blown out. From each third opening 5, such as blowing out along the flow of air C, or varying the timing and amount of blowout between the side near the first opening 3 or the second opening 4 and the center side of the furnace body element 8. By blowing out under different conditions, the fuel gas F may be supplied in a further advanced dispersion state.

  As shown in FIGS. 3 and 4, the wall surface radiant burner 1 according to the second embodiment is basically for combustion that produces a Coanda effect in the furnace body element 8 that forms the radiant wall surface 2 facing the processing material. The first opening 3 and the second opening 4 in which the switching of the blowout of the air flow of the air C and the discharge of the exhaust gas E after combustion are performed alternately, and the first opening 3 and the second opening 4 A plurality of third openings 5 that are arranged between them and blow out the gas flow of the fuel gas F are formed. The radiation wall surface of the furnace element 8 is blown out from either the first opening 3 or the second opening 4. The gas flow of the fuel gas F is distributed and supplied from the plurality of third openings 5 to the air flow of the combustion air C directed to the other one of the first opening 3 and the second opening 4 along the line 2. By doing so, a flat flame f that heats the radiation wall surface 2 along the radiation wall surface 2 is produced. And configured to heat the processing material by the radiant heat from the radiant wall 2.

  A heat storage body 6 is connected to the first opening 3 and the second opening 4 via an air supply / exhaust flow path 9. The heat storage body 6 stores the heat of the exhaust gas E to heat the combustion air C. Therefore, the exhaust gas E and the combustion air C are circulated alternately.

  FIG. 3 is a longitudinal sectional view of the wall surface radiant burner 1 according to the second embodiment. FIG. 4 is a bottom view of the wall surface radiation type burner 1 showing the first opening 3, the second opening 4, the third opening 5, and the heat storage body 6 provided on the radiation wall surface 2. The first embodiment is a case where the air flow of the fuel air C is blown out only from the first opening 3 and the exhaust gas E after combustion is discharged only from the second opening 4, but the second embodiment is This is a case where the first opening 3 and the second opening 4 alternately perform the blowing of the air flow and the discharge of the exhaust gas.

  That is, when the first opening 3 blows the air flow of the combustion air C, the second opening 4 discharges the exhaust gas E, and when the second opening 4 blows the air flow of the combustion air C, the first opening 3 The blowing and discharging are switched alternately so that the opening 3 discharges the exhaust gas E. Therefore, in the second embodiment, the air supply passage 9a of the first opening 3 and the exhaust passage 9b of the second opening 4 of the first embodiment are both replaced with the air supply / exhaust passage 9. The 2nd opening part 4 is formed in the form which blows off the air flow of the combustion air C which produces the Coanda effect similarly to the 1st opening part 3 of 1st Embodiment.

  A heat storage body 6 connected to an air supply system 27 and an exhaust system 28 is provided in each air supply / exhaust flow path 9 connected to each of the first and second openings 3 and 4. The heat storage body 6 is in the form of a container through which gas can circulate, and is filled with a large number of heat storage materials. The combustion air C supplied from the air supply system 27 passes through the heat accumulator 6 and then blows out from the first opening 3 or the second opening 4 via the supply / exhaust flow path 9. The exhaust gas E discharged from the first opening 3 or the second opening 4 passes through the heat storage body 6 via the supply / exhaust flow path 9 and is then discharged from the exhaust system 28.

  The distribution of the combustion air C and the exhaust gas E to the heat accumulator 6 is switched by closing one of the on-off valves 29 provided in the air supply system 27 and the exhaust system 28 and opening the other. The heat storage material is heated when the exhaust gas E flows through the heat storage body 6, and is heated by the heat storage material when the combustion air C flows through the heat storage body 6. Thereby, exhaust heat energy can be used effectively.

  In the first embodiment, the burner operation in which the air flow of the combustion air C is blown out only from the first opening 3 and the exhaust gas E is discharged from only the second opening 4 is performed. In the second embodiment, in addition to that, The air flow of the combustion air C that causes the Coanda effect is also blown out from the second opening 4, and the exhaust gas E is discharged from the first opening 3.

  By switching the flow of the combustion air C and the exhaust gas E to an alternating type, the first and second openings 3 and 4 are compared with the case where the flat flame f is generated only from one direction as in the first embodiment. A flat flame f can be generated from both sides to heat the radiant wall 2, the radiant wall 2 can be heated more uniformly in its length direction, and the heat treatment of the treatment material can be further homogenized. it can. Moreover, by providing the heat storage body 6 that heats the combustion air C with exhaust heat energy, it is possible to configure the wall surface radiation burner 1 with good thermal efficiency.

  Even in the second embodiment, it is a matter of course that the same effects as the first embodiment can be obtained.

  FIG. 5 shows a wall surface radiation type burner 1 according to the third embodiment. In the third embodiment, the third opening 5 is formed along the flow direction of the air flow of the combustion air C in order to supply the gas flow of the fuel gas F along the air flow of the combustion air C. It is a thing. Basically, referring to FIG. 1 showing the first embodiment, the fuel gas F blown from the third opening 5 through the lower part of the fuel flow path 10 on the side of the radiation wall surface 2 is It is comprised by forming in the inclination path | route 20 of the diagonal direction so that the blowing direction of the airflow of the combustion air C of this may be followed.

  FIG. 5 shows a case where the concept is applied to the second embodiment. That is, the plurality of third openings 5 are formed as a pair of two pairs that face in opposite directions with respect to the flow direction of the air flow of the combustion air C, and the first opening 3 and the second opening 4. Thus, the gas flow of the fuel gas F is blown out from the third opening 5 in either direction in response to the alternating switching of the blowing of the combustion air C and the discharge of the exhaust gas E. Then, the blowing of the fuel gas F and the blowing of the combustion air C are directed in the same direction.

  As shown in FIG. 5, the fuel flow path 10 has a straight path 15 in the vertical direction and an inclined path 20 that is inclined and connected to the third opening 5 side.

  The plurality of third openings 5 are arranged in pairs as a pair of adjacent ones. In the illustrated example, four pairs are provided. The two third openings 5 forming a pair are formed so that the directions of the inclined paths 20 face each other.

  That is, the two fuel flow paths 10 adjacent to each other in a pair go straight in the vertical direction at the top, and the third opening 5 connected to one fuel flow path 10 is connected to the furnace at the bottom on the radiation wall surface 2 side. The third opening 5 that is inclined toward one side (the second opening 4 side) in the longitudinal direction of the body element 8 and connected to the other fuel flow path 10 is the other side in the longitudinal direction of the furnace element 8 ( It is inclined toward the first opening 3 side.

  Of the two third openings 5 that make a pair, for example, when the combustion air C is blown out from the first opening 3, it is inclined in a direction along the direction of the air flow of the combustion air C. The fuel gas F is blown out from the third opening 5. As a result, when the combustion air C is alternately blown out from either the first opening 3 or the second opening 4, the inclined path 20 extends from the third opening 5 along the flow direction of the combustion air C. Fuel gas F is blown out.

  In the illustrated example, when the air flow of the combustion air C is blown out from the first opening 3, the valves 26 of the fuel flow paths 10 in which the inclination direction of the inclined path 20 is along the combustion air C (in the drawing) , Shown in white) is opened, and the valves 26 (shown in black in the drawing) of the fuel passages 10 in which the inclination direction of the inclined path 20 faces the combustion air C are closed.

  Thus, the fuel gas F from the third opening 5 in the direction along the direction of the combustion air C blown out from the first opening 3 out of the third openings 5 that make a pair and whose blowing direction is opposite. Is blown out.

  When the air flow of the combustion air C is blown out from the second opening 4, half of the valves 26 (indicated by black solids in the figure) of the fuel flow path 10 are opened and half of the fuel flow paths 10 are opened. The valve 26 (shown in white in the figure) is closed.

  As described above, in the configuration in which the combustion air C is blown out from the first and second openings 3 and 4 by switching to the alternating type, a pair is formed according to the direction of the combustion air C in which the blowing direction is alternately changed. The fuel gas F is alternately blown out from any of the openings 5.

  If it does in this way, the fuel gas F which blows off from the 3rd opening part 5 can be blown out so that it may approach the radiation wall surface 2 more, and it is the vertical direction rather than 1st Embodiment and 2nd Embodiment. A flat flame f having a small thickness and approaching the radiation wall surface 2 can be generated, and the heating action of the radiation wall surface 2 can be further improved by the flat flame f.

  Even in the third embodiment, it is a matter of course that the same operational effects as those of the first and second embodiments can be obtained.

  FIG. 6 shows a wall surface radiation type burner 1 according to the fourth embodiment. In the fourth embodiment, the third opening 5 is supplied in the flow direction of the air flow of the combustion air C in order to supply the gas flow of the fuel gas F in the direction opposite to the air flow of the combustion air C. It was formed towards In short, the fourth embodiment is a case where the gas flow of the fuel gas F is blown out opposite to the flow direction of the air flow of the combustion air C, contrary to the third embodiment.

  Basically, referring to FIG. 1 showing the first embodiment, as in the third embodiment, the fuel gas blown out from the third opening 5 in the lower part of the fuel flow path 10 on the radiation wall surface 2 side. Contrary to the blowing direction of the air flow of the combustion air C from the first opening 3, F is formed by an oblique inclined path 20 that faces the air flow.

  FIG. 6 shows a case where the concept is applied to the second embodiment. Similarly to the third embodiment, in the fourth embodiment, the plurality of third openings 5 are formed as a pair of two pairs that face in opposite directions with respect to the flow direction of the combustion air C. The gas of the fuel gas F is output from the third opening 5 in either direction in response to the alternating switching of the blowing of the combustion air C and the discharge of the exhaust gas E at the part 3 and the second opening 4. The fuel gas F is blown out and the combustion air C is blown out in opposite directions.

  Unlike the third embodiment, the fourth embodiment is inclined in a direction facing the air flow of the combustion air C blown out from the first opening 3 out of the two third openings 5 that make a pair. The fuel gas F is blown out from the third opening 5. Thereby, when the combustion air C is alternately blown out from either the first opening 3 or the second opening 4, the third opening 5 on the side where the inclined path 20 faces the flow direction of the combustion air C. The fuel gas F is blown out toward the combustion air C.

  In the illustrated example, when the air flow of the combustion air C is blown out from the first opening 3, the valves 26 (in the drawing) of the fuel flow path 10 in which the inclination direction of the inclined path 20 is directed to the combustion air C. , Shown in white) is opened, and the valves 26 (shown in black in the drawing) of the fuel flow path 10 in which the inclination direction of the inclined path 20 is in the direction along the combustion air C are closed.

  As a result, out of the third openings 5 that form a pair and whose blowing direction is opposite, the fuel from the third openings 5 is directed toward the direction of the combustion air C blown out from the first openings 3. Gas F is blown out.

  When the air flow of the combustion air C is blown out from the second opening 4, half of the valves 26 (indicated by black solids in the figure) of the fuel flow path 10 are opened and half of the fuel flow paths 10 are opened. The valve 26 (shown in white in the figure) is closed.

  As described above, in the configuration in which the combustion air C is blown out from the first and second openings 3 and 4 by switching to the alternating type, a pair is formed according to the direction of the combustion air C in which the blowing direction is alternately changed. The fuel gas F is alternately blown out from any of the openings 5. In this way, since the air-fuel mixture can be promoted by the combustion air C and the fuel gas F colliding from the front, unevenness of the flame can be suppressed.

  Even in the fourth embodiment, it is needless to say that the same effects as those in the first and second embodiments can be obtained.

  7 and 8 show a wall surface radiation type burner 1 according to a fifth embodiment. FIG. 8 is an enlarged view of the third opening 5 of the wall surface radiant burner 1 shown in FIG. In the fifth embodiment, the inclined path 20 exemplified in the third and fourth embodiments is formed by a curved path 16.

  The fuel flow path 10 and the radiation wall surface 2 are connected by the continuous curved surface 14 through the 3rd opening part 5, as shown in FIG. In the illustrated example, the fuel flow path 10 has a straight path 15 in the vertical direction and a curved path 16 that is connected to the third opening 5 side. The curved fuel flow path 10 may be applied to the first and second embodiments.

  The plurality of third openings 5 are arranged in pairs with two adjacent ones. The two third openings 5 forming a pair are formed such that the curved paths 16 that are curved face each other. That is, the two fuel flow paths 10 adjacent to each other in a pair go straight in the vertical direction at the top, and the third opening 5 connected to one fuel flow path 10 is connected to the furnace at the bottom on the radiation wall surface 2 side. The third opening 5 that curves toward one side (second opening 4 side) in the longitudinal direction of the body element 8 and is connected to the other fuel flow path 10 is the other side in the longitudinal direction of the furnace element 8 ( It is curved toward the first opening 3 side).

  The fuel gas F blown out from each third opening 5 is supplied along the air flow of the combustion air C accurately or in opposition to the curved path 16, so the combustion air blown out in a flat shape By mixing the fuel gas F while maintaining the flow of C, it is possible to form a flat flame f that is lower in height than the third and fourth embodiments and is close to the radiation wall surface 2.

  Since the third opening 5 for blowing out the fuel gas F is connected to the curved path 16, the metal part 17 which is attached to the back of the third opening 5 and forms a nozzle is shaded by the furnace body element 8. Therefore, the wall surface radiation type burner 1 having excellent durability can be provided (see FIG. 8). Accordingly, it is not necessary to use cooling air for cooling the metal portion 17 forming the nozzle, and the equipment can be simplified and the running cost can be reduced.

  Even in the fifth embodiment, it is a matter of course that the same effects as those in the first to fourth embodiments can be obtained.

  9 and 10 show a wall surface radiation type burner 1 according to a sixth embodiment. FIG. 10 is an enlarged view of the third opening 5 of the wall surface radiant burner 1 shown in FIG. In the sixth embodiment, the third opening 5 exemplified in the first to fifth embodiments is formed in a form in which the Coanda effect is generated in the gas flow of the fuel gas F.

  As shown in the figure, a curved path 18 is formed in the fuel flow path 10 so as to be located in the back of the curved surface 14 and toward the direction in which the curved surface 14 is folded. In this case, when the fuel gas F blows out from the third opening 5, the gas flow of the fuel gas F can be caused to swirl toward the radiation wall surface 2, and the radiation wall surface 2 is heated by the flat flame f. The effect can be further improved.

  Even in the sixth embodiment, it is a matter of course that the same operational effects as those of the first to fifth embodiments can be obtained.

  Further, the Coanda effect can be generated also in the fuel gas F, and the fuel gas F can be blown out along the radiant wall surface 2, and the third embodiment, the fourth embodiment, and the fifth embodiment. A flat flame f that is thinner in the vertical direction than the form and is close to the radiation wall surface 2 can be generated, and the heating action of the radiation wall surface 2 can be further improved by the flat flame f.

  FIG. 11 shows a wall surface radiation type burner 1 according to the seventh embodiment. In the seventh embodiment, at least one of the first opening 3 and the second opening 4 that blows out the air flow of the combustion air C is disposed in the back of the first opening 3 and the second opening 3. , 4 is provided with a fuel supply means 21 for mixing the fuel gas xF in advance with the air flow of the combustion air C to be blown out in order to blow out the combustion flame xf from at least one of the furnace elements 8. . The fuel supply means 21 can be provided for any of the first to sixth embodiments.

  FIG. 11 shows a case where it is incorporated in the configuration of the sixth embodiment. By incorporating the fuel supply means 21 into the first opening 3 and the second opening 4 that are provided with the heat accumulator 6 and alternately blow out the air flow of the combustion air C, a pair of alternating combustion types is provided in the furnace body element 8. With a regenerative burner unit.

  In this case, not the air flow but the combustion flame xf is alternately ejected from the first opening 3 and the second opening 4 to which the combustion air C is supplied. In the first to sixth embodiments, Since it can be expanded and heated to a portion where no flame is present (flame range indicated by P in the figure), the radiant wall surface 2 is heated more widely between the first and second openings 3 and 4 to radiate heat. Can be released in a wide range.

  At this time, as shown in FIG. 11, the supply / exhaust flow path 9 connected to the first opening 3 and the second opening 4 is also positioned behind the curved surface 11 and curved toward the direction of folding back with respect to the curved surface 11. A path 19 may be formed. As a result, a swirling action can be generated in the combustion air C and also in the combustion flame xf, and the radiation wall surface 2 can be efficiently heated. The curved path 19 may be formed in the first opening 3 of the first embodiment and the first and second openings 3 and 4 of the second to sixth embodiments.

  Even in the seventh embodiment, it is a matter of course that the same effects as those in the first to sixth embodiments can be obtained.

  FIG. 12 shows another embodiment of the first, second, and third openings 3 to 5 provided on the radiation wall surface 2 of the wall surface radiation burner 1. In the said embodiment, although the 1st-3rd opening parts 3-5 were made into the flat-shaped nozzle form, as shown in figure, it is set as the form which arranged normal hole 3 ', 4', 5 'in the linear form. Also good.

  Moreover, although the case where the fuel F was gas was illustrated and demonstrated in the said embodiment, it is needless to say that all forms of fuels, such as liquid and powder which are forms other than gas, can be used.

  Moreover, the heating furnace can be easily configured by unitizing the wall surface radiation type burner 1 described in the above embodiment, and forming the furnace body such as the furnace ceiling portion by connecting these wall surface radiation type burners 1 in series. it can. In the above embodiment, the furnace body element 8 constitutes the furnace ceiling part, but it goes without saying that it may constitute a hearth part or a furnace wall part.

DESCRIPTION OF SYMBOLS 1 Wall surface radiation type burner 2 Radiation wall surface 3, 3 '1st opening part 4, 4' 2nd opening part 5, 5 '3rd opening part 6 Thermal storage body 8 Furnace body element 9 Supply / exhaust flow path 9a Supply air flow path 9b Exhaust Flow path 10 Fuel flow path 11 Curved surface 12 Straight path 13 Curved path 14 Curved surface 15 Straight path 16 Curved path 17 Metal portion forming a nozzle 18 Curved path 19 Curved path 20 Inclined path 21 Fuel supply means 25 Furnace wall 26 On-off valve 27 Air supply System 28 Exhaust system 29 On-off valve C Combustion air E Exhaust gas F Fuel gas P Expanded flame range f Flat flame xf Combustion flame xF Fuel gas

Claims (10)

A first opening that blows an air flow of combustion air that produces a Coanda effect in a furnace element that forms a radiation wall surface facing the treatment material, a second opening that discharges exhaust gas after combustion, and these first openings A plurality of third openings that are disposed between the first opening and the second opening, and blow out fuel,
The fuel is dispersedly supplied from the plurality of third openings to the air flow of the combustion air blown out from the first openings and directed toward the second openings along the radiation wall surfaces of the furnace body elements. By doing so, a flat flame that heats the radiation wall surface along the radiation wall surface is generated, and the treatment material is heated by radiation heat from the radiation wall surface. A first opening and a second opening in which the switching between the blowing of the air flow of the combustion air causing the Coanda effect and the discharge of the exhaust gas after combustion is performed alternately on the furnace element forming the radiation wall surface facing the treatment material And a plurality of third openings that are disposed between the first opening and the second opening and blow off the fuel,
Air of the combustion air blown out from one of the first opening and the second opening and directed toward the other of the first opening and the second opening along the radiation wall surface of the furnace body element The fuel is dispersed and supplied to the flow from the plurality of third openings to generate a flat flame that heats the radiation wall along the radiation wall surface, and the treatment material is generated by radiation heat from the radiation wall surface. A wall surface radiant burner characterized in that it is heated.   A heat accumulator is connected to the first opening and the second opening via a flow path. The heat accumulator burns with the exhaust gas in order to store the heat of the exhaust gas and heat the combustion air. The wall surface radiation type burner according to claim 2, wherein the working air is circulated alternately.   The third opening is formed in a direction along a flow direction of the air flow of the combustion air in order to supply fuel along the air flow of the combustion air. The wall surface radiation type burner according to any one of items 1 to 3.   The third opening is formed in a direction opposite to the flow of combustion air in order to supply fuel in a direction opposite to the flow of combustion air. The wall surface radiation type burner according to any one of claims 1 to 3.   The plurality of third openings are formed as a pair of two facing each other in the opposite direction with respect to the flow direction of the air flow, and the blowout of the air flow and the exhaust gas are performed at the first opening and the second opening. 6. The wall surface radiation according to claim 2, wherein the fuel is blown out from the third opening in any one direction in response to the switching of the discharge being performed alternately. Formula burner.   The wall surface radiation type burner according to claim 1, wherein the plurality of third openings distribute and supply fuel.   The wall surface radiant burner according to any one of claims 1 to 7, wherein the third opening is formed in a form in which the flow of fuel blown out produces a Coanda effect.   At least one of the first opening and the second opening that blows out the air flow of combustion air is disposed behind the first opening and the second opening, and a flame is blown out from at least one of the first and second openings. 9. A wall surface radiant burner according to claim 1, further comprising fuel supply means for mixing fuel in advance with the air flow of the combustion air blown out.   The wall surface according to any one of claims 1 to 9, wherein at least the first opening and the third opening are formed in a flat nozzle shape that is long along a direction intersecting the air flow. Radiant burner.

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