JPWO2008038426A1 - Burner, combustion apparatus equipped with burner, and boiler - Google Patents

Abstract

Fluid transport flow as a fuel-containing fluid supply nozzle 12 for supplying a fuel-containing fluid from a connecting portion of a fluid transport channel 10 for transporting the fuel and a fuel-containing fluid of the fuel transport medium toward an outlet provided on the wall of the furnace 4 The cross section orthogonal to the fluid flow direction from the connecting portion 10a of the passage 10 to the outlet portion provided on the wall surface of the furnace 4 has a rectangular shape, an elliptical shape, or a substantially elliptical shape having a long diameter portion and a short diameter portion, and fluid conveyance A burner provided with an air supply nozzle 15 for gradually increasing the cross-sectional area perpendicular to the fluid flow direction from the connection portion of the flow path 10 to the outlet portion and supplying one or more combustion air to the outer peripheral portion of the nozzle 12 A burner for solid fuel that suppresses the expansion of the unignited region while preventing the increase of the NOx concentration in the combustion gas and the reduction of the combustion efficiency while increasing the capacity, and a combustion apparatus equipped with the burner. Boiler It can be provided.

Description

  The present invention relates to a burner, a combustion apparatus equipped with the burner, and a boiler, and more particularly to the burner capable of efficient low nitrogen oxide (NOx) combustion.

  FIG. 28 shows an example of a conventional burner for solid fuel (pulverized coal, biomass fuel, etc.). FIG. 28A is a side sectional view of the burner, and FIG. 28B is a front view of the burner as seen from the furnace (4) side. The solid fuel burner includes a fuel-containing fluid supply nozzle (12) that defines a fuel-containing fluid flow path through which a fuel-containing fluid (11) containing solid fuel and primary air for conveyance flows toward the furnace (4); And a combustion air sleeve (15) provided on the outer periphery of the fuel-containing fluid supply nozzle (12), and the air in the wind box (3) is defined by the sleeve (15). And is supplied as secondary air (13) and tertiary air (14). A flame holder (17) is provided at the tip of the fuel-containing fluid supply nozzle (12), and the fuel can be ignited from the vicinity of the burner by the effect of the circulating vortex formed in the downstream flow.

  The tip of the combustion air sleeve (15) is at a position facing a burner throat (16) provided on the wall surface of the furnace. The tip of the sleeve (15) is a combustion air guide plate (15a) extending outside the burner. The tertiary air (14) is spread outward by the combustion air guide plate (15a), delays the mixing of the air into the flame center, and promotes combustion under reducing atmosphere conditions lacking air. The generation of nitrogen oxides (NOx) in the combustion gas is suppressed.

  FIG. 1 (c) shows a cross-sectional view of the fuel-containing fluid supply nozzle (12) in the conventional burner in the direction along the jet flow of the fuel-containing fluid (11), and FIG. As shown in the front view of the outlet of the fuel-containing fluid supply nozzle (12) of the burner from the furnace (4) side, in the prior art burner, the cross section of the outlet of the fuel-containing fluid supply nozzle (12) Has a shape close to a circle. When the fuel-containing fluid (11) is charged into the furnace (4), the fuel-containing fluid supply nozzle (12) is heated by the radiation in the furnace (4) or the circulation vortex behind the flame holder (17). The fuel is ignited in the vicinity of the exit.

  FIG. 29 (a) shows a cross-sectional view of the fuel-containing fluid supply nozzle (12) in the prior art burner in the direction along the jet flow of the fuel-containing fluid (11), and FIG. 29 (b) shows the fuel-containing fluid supply. As shown in a front view of the outlet portion of the nozzle (12) as viewed from the furnace (4) side, the ignition position of the fuel in the fuel-containing fluid ejected from the fuel-containing fluid supply nozzle (12) into the furnace (4) ( 33) is formed. After the fuel ignites on the surface of the jet of the fuel-containing fluid (11), the flame formed gradually propagates toward the center of the jet of the fuel-containing fluid (11). FIG. 30 schematically shows the behavior of flame propagation in the furnace (4) in the cross-sectional direction along the jet flow of the fuel-containing fluid (11) of the fuel-containing fluid supply nozzle (12) in the prior art burner. is there. An ignition region (32) is formed around the conical non-ignition region (31).

  The burner having a circular cross section shown in FIGS. 28 to 30 is often used in a so-called opposed combustion system, which is disposed on a pair of opposed furnace walls. On the other hand, in so-called tangential combustion, in which fuel is burned while jetting the fuel-containing fluid in the direction of swirling into the furnace (4) from the outlets of the plurality of fuel-containing fluid supply nozzles (12) along the furnace wall surface. The outlet shape of the cross section of the fuel-containing fluid supply nozzle (12) (cross section orthogonal to the fuel-containing fluid flow) is often a square or a rectangle close to a square.

Also, a burner in which the outlet shape of the transverse section of the fuel-containing fluid supply nozzle (12) (cross section orthogonal to the fuel-containing fluid flow) is rectangular, elliptical or substantially elliptical having a major axis and a minor axis is as follows. It is disclosed in Patent Documents 1 to 3.
JP-T 59-500981 JP-A-8-226615 Japanese Patent Laid-Open No. 11-281090

  Generally, the cross section of the outlet of the fuel-containing fluid supply nozzle (12) of the burner has a circular or nearly square shape, and ignited outside the fuel-containing fluid jet in the furnace (4) as shown in FIG. It may take a considerable distance for the flame to propagate to the center of the fuel-containing fluid jet. The distance at which the ignited flame in the direction of the jet flow of the fuel-containing fluid (11) from the fuel-containing fluid supply nozzle (12) propagates to the center of the fuel jet, that is, the unignited distance L1 ′ shown in FIG. The larger the diameter or the peripheral portion of the fluid supply nozzle (12), the longer and the non-ignition area (31) is enlarged. Promoting combustion in the reduction region in the vicinity of the burner is important for suppressing NOx generation in the combustion gas, but the expansion of the unignited region (31) hinders the characteristics of suppressing this NOx concentration. It will be. In addition, the expansion of the non-ignition region (31) means that the combustion time after ignition is shortened, which also causes a decrease in combustion efficiency.

  Increasing the burner capacity (reducing the number of burners) is an effective technique for reducing cost and improving operability. In the prior art, however, the diameter or outer diameter of the fuel-containing fluid supply nozzle (12) increases as the burner capacity increases. The length of the part becomes longer, the unignited region (31) expands, and there is a problem that causes an increase in NOx and a decrease in combustion efficiency. This problem was caused by the large distance from the ignition region (32) on the fuel-containing fluid jet surface to the center of the fuel-containing fluid jet. Further, the outlet shape of the transverse section (cross section perpendicular to the fuel-containing fluid flow) of the fuel-containing fluid supply nozzle (12) described in Patent Documents 1 to 3 is a rectangular shape composed of a combination of a major axis and a minor axis. In the invention, nothing is mentioned about measures against the increase of the burner capacity to expand the non-ignition region (31), resulting in an increase in NOx and a decrease in combustion efficiency.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a solid fuel burner that prevents an increase in the unignited region while preventing the increase in the NOx concentration in the combustion gas and prevents a decrease in combustion efficiency while increasing the capacity, and a combustion apparatus equipped with the burner. And providing a boiler.

The problems of the present invention are solved by the following means.
The invention according to claim 1 is provided on the wall surface of the furnace (4) from the connection part (10a) of the fuel-containing fluid transport channel (10) for transporting the solid fuel and the fuel-containing fluid (11) of the fuel transport medium. A fuel-containing fluid supply nozzle (12) that supplies the fluid (11) toward the outlet, and an air supply nozzle (15) that supplies one or more combustion airs to the outer periphery of the fuel-containing fluid supply nozzle (12) The fuel-containing fluid supply nozzle (12) has a fluid (11) directed from the connection (10a) of the fluid transfer channel (10) toward an outlet provided on the wall of the furnace (4). The cross section perpendicular to the flow of the fluid is rectangular, elliptical or substantially elliptical having a major axis and a minor axis, and the fluid (11) is directed from the connecting part (10a) of the fluid transfer channel (10) toward the outlet. The size of the major axis of the cross section perpendicular to the flow of A burner is gradually enlarged along the flow direction of the body (11).

  According to the second aspect of the present invention, the fuel-containing fluid supply nozzle (12) has a cross-section orthogonal to the flow of the fluid (11) from the connection portion (10a) of the fluid transfer channel (10) toward the outlet portion. 2. The burner according to claim 1, wherein the size of the long diameter portion gradually expands along the flow direction of the fluid (11), and the size of the short diameter portion remains unchanged.

  According to a third aspect of the present invention, the fuel-containing fluid supply nozzle (12) has a cross section perpendicular to the flow of the fluid (11) from the connection portion (10a) of the fluid transfer channel (10) toward the outlet portion. 2. The burner according to claim 1, wherein the size of the long diameter portion gradually increases along the flow direction of the fluid (11), and the size of the short diameter portion gradually decreases along the flow direction of the fluid (11). is there.

  According to a fourth aspect of the present invention, the fuel-containing fluid supply nozzle (12) has a fuel-containing fluid guide plate (19) that divides the flow of the fuel-containing fluid (11) into a plurality thereof. The burner according to any one of the above.

  According to a fifth aspect of the present invention, the fuel-containing fluid guide plate (19) is arranged on a line extending the central axis in the flow direction of the fluid (11) in the fuel-containing fluid supply nozzle (12) into the furnace (4). The burner according to claim 4, wherein the burner is arranged at a plurality of different inclination angles with respect to a plane parallel to the shortest diameter of the short diameter portion of the nozzle (12).

  According to a sixth aspect of the invention, the fuel-containing fluid direction changing guide plate (21) in which the fuel-containing fluid supply nozzle (12) forcibly changes the flow direction of the fuel-containing fluid (11) in the outlet thereof. It is a burner in any one of Claims 1-5 which have these.

  According to the seventh aspect of the present invention, the guide plate (21) for changing the direction of fuel-containing fluid passes along a line extending the central axis of the fuel-containing fluid supply nozzle (12) into the furnace (4), and the nozzle (12 The burner according to claim 6, wherein the burner is disposed in a plurality of different directions with respect to a plane parallel to the longest diameter of the long diameter portion.

  According to the eighth aspect of the present invention, the guide plate (21) for changing the direction of fuel-containing fluid has a center axis of the fuel-containing fluid supply nozzle (12) in the furnace (4) for a part of the fuel-containing fluid (11). And is arranged in parallel to a plane parallel to the longest diameter of the long diameter portion of the nozzle (12), and for the other fuel-containing fluid (11), the center of the fuel-containing fluid supply nozzle (12) The burner according to claim 6, wherein the burner is arranged with an inclination angle with respect to a plane parallel to the longest diameter of the long diameter portion of the nozzle (12) passing through a line extending in the furnace (4).

  According to the ninth aspect of the present invention, the fuel-containing fluid supply nozzle (12) is partitioned into a plurality of flow paths by the fuel-containing fluid guide plate (19), and the central axis of each flow path is a fuel-containing fluid. The central axis of the supply nozzle (12) passes through a line extending into the furnace (4), and the furnace (4) is inclined at different inclination angles with respect to a plane parallel to the longest diameter of the long diameter portion of the outlet of the nozzle (12). It is a burner of Claim 4 provided in the wall surface.

  A tenth aspect of the present invention provides the fuel-containing fluid dividing plate (22) capable of dividing the outlet portion into a plurality of portions at the outlet portion of the fuel-containing fluid supply nozzle (12). The burner described in 1.

  Invention of Claim 11 is a burner in any one of Claims 1-10 which provided the flame holder (17) of L-shaped cross section in the exit part of the said fuel containing fluid supply nozzle (12).

  According to a twelfth aspect of the present invention, a guide plate (17a) is provided at the tip of the L-shaped flame stabilizer (17) for changing the direction of jetting of combustion air around the flame stabilizer (17) to the outside. A burner according to claim 11.

  According to a thirteenth aspect of the present invention, the jet direction of the combustion air outside the one or more combustion air supply nozzles (15) arranged on the outer peripheral portion of the nozzle (12) is extended outward with respect to the fuel jet direction. It is a burner in any one of Claims 1-12 which provided the air guide plate (15a) for combustion in the front-end | tip of the said fuel containing fluid supply nozzle (12).

  According to a fourteenth aspect of the present invention, the fuel-containing fluid supply nozzle (12) is provided with a concentrator (23) that once narrows the flow path of the fuel-containing fluid (11) and then expands the flow path again. It is a burner in any one of Claims 1-13.

  According to a fifteenth aspect of the present invention, a fluid distribution plate (24) for evenly distributing fuel in the nozzle (12) is provided at the inlet of the fuel-containing fluid supply nozzle (12). The burner according to any one of the above.

  According to a sixteenth aspect of the present invention, a fuel-containing fluid is supplied to a nozzle (41, 44) that ejects liquid fuel or gaseous fuel as auxiliary fuel in the vicinity of the fluid (11) ejected from the fuel-containing fluid supply nozzle (12). It is a burner in any one of Claims 1-15 provided in the nozzle (12) vicinity.

  In the invention described in claim 17, the burner according to claims 1 to 16 is arranged in a plurality of stages in the vertical direction on two opposing furnace walls, and the plurality of burners provided in each stage has a horizontal width of the same furnace wall. It is a combustion device arranged symmetrically in the wall surface area divided into two in the central part.

  The invention according to claim 18 is the horizontal direction among the plurality of burners provided in each stage of the same furnace wall, wherein the burner according to claims 1 to 16 is arranged in a plurality of stages in the two vertical furnace walls respectively. The burners adjacent to each other are burners having the same structure.

  The invention according to claim 19 is a boiler including a furnace wall configured by spirally winding a water wall pipe (25) inclined in the horizontal direction along the longitudinal direction of the water wall pipe (25). A rectangular, elliptical or substantially elliptical opening (26) is provided in the furnace wall, and the burner according to any one of claims 1 to 16 is attached to the opening (26).

  The invention according to claim 20 is a boiler having a furnace wall composed of a group of water wall pipes (25) extending in a vertical direction, and is rectangular and elliptical along the longitudinal direction of the water wall pipe (25). Or it is a boiler which installs the substantially elliptical opening part (26) in a furnace wall, and attaches the burner in any one of Claims 1-16 to the said opening part (26).

  According to the first aspect of the present invention, even if the burner capacity is increased, it is possible to suppress the expansion of the unignited region, and the fuel-containing fluid can be maintained even after the fuel-containing fluid (11) is put into the furnace (4). (11) spreads in the width direction, and the cross-sectional area of the jet flow of the fuel-containing fluid (11) is enlarged and the flow velocity is reduced, so that it is effective for reducing the unignited distance compared to the prior art. Because the fuel-containing fluid (11) spreads in the furnace (4), the combustion space can be used effectively, and the residence time in the furnace becomes longer, and the effect of reducing NOx concentration in combustion gas and improving combustion efficiency There is.

  According to the invention described in claim 2, since the size of the minor axis portion is unchanged, it is effective in simplifying the structure. In addition, since the upstream flow velocity of the fuel-containing fluid supply nozzle (12) can be increased, it is effective for preventing flashback in the case of fuel that is easily ignited.

  According to invention of Claim 3, the increase in the flow rate of the fuel-containing fluid (11) from the fuel-containing fluid connection part (10a) toward the outlet part of the fuel-containing fluid supply nozzle (12) can be suppressed, and the pressure loss And the wear of the components in the fuel-containing fluid supply nozzle (12) can be suppressed.

  According to the fourth and fifth aspects of the present invention, the flow of the fuel-containing fluid (11) is divided into a plurality of parts by the fuel-containing fluid guide plate (19) inside the fuel-containing fluid supply nozzle (12). The fuel-containing fluid (11) is evenly supplied from the fluid connection (10a) toward the outlet of the fuel-containing fluid supply nozzle (12) in the direction in which the nozzle (12) expands, reducing NOx and improving combustion efficiency. Further, the effect of suppressing the increase in the flow velocity, minimizing the pressure loss, and suppressing the wear of the component parts are further improved than those of the invention of the third aspect.

  According to invention of Claim 6, dispersion | distribution in the furnace (4) of a fuel containing fluid jet flow (20) is accelerated | stimulated, and it has the effect that combustion in a furnace (4) wake part is accelerated | stimulated.

  According to the seventh aspect of the present invention, the fuel-containing fluid guide plate (19) passes through a line extending the central axis of the fuel-containing fluid supply nozzle (12) into the furnace (4), and the nozzle (12). Since they are arranged in directions opposite to each other with respect to a plane parallel to the longest diameter of the long diameter portion, the fuel-containing fluid (11) can be injected into the furnace (4) in two or more groups. The fuel-containing fluid jet stream (20) is grouped with a simple structure, and the dispersion of the fuel-containing fluid jet stream (20) in the furnace (4) is promoted. Combustion is promoted.

  According to the invention described in claim 8, the four fuel-containing fluid jets (20) formed by the fuel-containing fluid supply nozzle (12) and the fuel-containing fluid guide plate (19) are divided into two groups (20a, 20b). ), For example, the fuel-containing fluid jet stream (20a) near the furnace side wall is made a straight flow, and the fuel-containing fluid jet stream (20b) not near the furnace side wall is jetted with an inclination in the horizontal direction. While maintaining the promotion of combustion in the downstream part of the furnace due to the dispersion of the ash, there is an effect of preventing ash adhesion by suppressing the inflow of the flame to the vicinity of the furnace side wall.

  According to the ninth aspect of the invention, the fuel-containing fluid (11) is ejected from the fuel-containing fluid supply nozzle (12) into the furnace (4) at different inclination angles with respect to the horizontal direction or the vertical direction. Since the direction of the fuel-containing fluid ejection flow (20) can be changed without using the components in the fuel-containing fluid supply nozzle (12) where solid fuel such as pulverized coal directly collides, it is possible to suppress wear of the components. It is effective for.

  According to the invention of claim 10, the fuel-containing fluid ejection plate (22) is divided by the fuel-containing fluid dividing plate (22), the surface area is enlarged, and the radiation receiving heat in the furnace (4) is increased. A negative pressure region is formed on the downstream side of the dividing plate (22), the surrounding high temperature gas flows into the negative pressure region, contributes to early ignition of the fuel, and combustion in the reduction region near the burner is promoted, Effectively reduces NOx concentration in combustion gas and improves combustion efficiency.

  According to the eleventh aspect of the invention, by providing the L-shaped flame holder (17) at the outlet of the fuel-containing fluid supply nozzle (12), the wake of the flame holder (17) Since the circulating vortex is formed and the high-temperature combustion gas is drawn back to the vicinity of the flame holder (17), it contributes to the early ignition of the fuel, and the combustion in the reduction region near the burner is promoted, and the NOx concentration of the combustion gas This effectively works to reduce the combustion and improve the combustion efficiency.

  According to the twelfth aspect of the present invention, the secondary air spreads outward by the secondary air guide plate (17a) at the tip of the L-shaped flame holder (17), and the flame holder (17) The circulation vortex of the flow becomes large, the amount of recirculation of the high-temperature combustion gas increases, and the ignition of the fuel is further accelerated compared with the invention of claim 11 to promote the combustion in the reduction region near the burner. Effectively reduces NOx concentration of combustion gas and improves combustion efficiency.

  According to the invention of claim 13, the combustion air guide plate (15 a) is provided that extends the combustion air ejection direction outside the combustion air supply nozzle (15) outward with respect to the fuel-containing fluid ejection direction. As a result, the combustion air spreads outside and the reduction region at the center of the flame is expanded, which effectively acts to reduce the NOx concentration of the combustion gas and improve the combustion efficiency.

  According to the fourteenth aspect of the present invention, the fuel near the flame holder (17) is concentrated by the concentrator (23), contributing to the early ignition of the fuel, and the combustion in the reduction region near the burner is promoted. Effectively reduces NOx concentration of combustion gas and improves combustion efficiency.

  According to the fifteenth aspect of the invention, the fuel concentration at the inlet portion of the fuel-containing fluid supply nozzle (12) is made uniform by the fluid distribution plate (24) and partitioned by the fuel-containing fluid guide plate (19). This is effective in suppressing NOx imbalance in the concentration of fuel flowing into each flow path and promoting NOx reduction and combustion efficiency improvement.

  According to the sixteenth aspect of the invention, liquid fuel or gaseous fuel is jetted to the burner outlet, so that the fuel-containing fluid (11) containing solid fuel can be ignited reliably.

  According to the invention described in claim 17, a plurality of stages of the burners according to claims 1 to 16 are arranged in the vertical direction on the opposing furnace walls of the opposed combustion type furnace (4), and the plurality of burners in each stage are the same. By arranging symmetrically in the wall surface area divided into two at the center of the horizontal width of the furnace wall, the direction of the fluid jet flow (20a, 20b) can be arranged symmetrically on one furnace wall surface. The left-right balance between the flow in the furnace (4) and the combustion state can be maintained well.

  According to invention of Claim 18, the burner of Claims 1-16 is each arrange | positioned in two or more stages on the two opposing furnace walls of a counter combustion type furnace (4), and each stage of the same furnace wall is arranged. Of the plurality of burners provided in the horizontal direction, the burners adjacent in the horizontal direction have the same structure, thereby avoiding collision of the fuel-containing fluid jets (20a, 20b) particularly in the small-volume furnace (4). Thus, local concentration of fuel is suppressed, and there is an effect of reducing NOx concentration in combustion gas and improving combustion efficiency.

  According to the nineteenth aspect of the present invention, it is necessary to form the opening (26) by arranging the longitudinal direction of the water wall pipe (25) and the longitudinal direction of the long diameter portion of the opening (26). It is economical because the number of the spiral water wall pipes (25) can be reduced, and the water wall pipe (25) can be processed and a boiler with less bent parts can be constructed. It becomes possible to minimize the number of spiral water wall pipes (25) required to form the opening (26), and the economy is improved. Further, since the fuel-containing fluid (11) spreads in the horizontal (width) direction of the furnace (4), the distribution of the fuel-containing fluid (11) is made uniform in the horizontal (width) direction of the furnace, and the substantial residence time in the furnace. Further, the length is increased, and the NOx concentration in the combustion gas is reduced and the combustion efficiency is improved.

  According to the invention of claim 20, since the rectangular opening (26) is installed along the arrangement of the water wall pipe (25) in the vertical direction on the furnace wall, the length of the water wall pipe (25) is set. By arranging the direction and the longitudinal direction of the long-diameter portion of the opening (26) to be aligned, it is possible to construct a boiler with less processing and bending of the water wall pipe (25), which is economical.

Embodiments of the present invention will be described with reference to the drawings.
The basic concept of the present invention will be described with reference to FIGS. FIG. 1 shows the ignition position (33) in the furnace 4 when the fuel-containing fluid supply nozzle (12) of the burner according to this embodiment shown in FIGS. 1 (a) and 1 (b) is used. c) Compared with the prior art shown in FIG. 1 (d). FIG. 1 (a) shows a cross-sectional view of the fuel-containing fluid (11) in the jet direction of the fuel-containing fluid (11) of the fuel-containing fluid supply nozzle (12) of the burner of this embodiment, and FIG. 1 (b) shows FIG. 1 (a). 1 is a front view of the outlet of the fuel-containing fluid supply nozzle (12) of the burner as viewed from the furnace (4) side, and FIG. 1 (c) shows the fuel content of the fuel-containing fluid supply nozzle (12) of the prior art burner. FIG. 1D is a front view of the outlet portion of the fuel-containing fluid supply nozzle (12) of the conventional burner as viewed from the furnace (4) side.

  As shown in FIG. 1 (d), in the prior art, a ring-shaped ignition position (33) exists around the circular jet flow of the fuel-containing fluid (11) ejected from the fuel-containing fluid supply nozzle (12) of the burner. To do. On the other hand, in this embodiment, as shown in FIG. 1B, an ignition position (33) is formed around the rectangular jet flow of the fuel-containing fluid (11) ejected from the fuel-containing fluid supply nozzle (12) of the burner. ) Exists.

  In the present embodiment, the shape of the outlet of the fuel-containing fluid supply nozzle (12) of the burner is rectangular and the length of the short side is reduced, so that the fuel-containing fluid (11) in the furnace (4) The distance L2 (FIG. 1 (b)) from the ignition position (33) in the direction orthogonal to the rectangular cross-sectional jet flow of the fuel-containing fluid (11) to the jet flow center is the same as that of the conventional fuel-containing fluid (11). Compared to the distance L2 ′ (FIG. 1 (d)) from the ignition position (33) in the direction perpendicular to the cross-sectional circular jet flow of the fuel-containing fluid (11) to the jet flow center.

  FIG. 2 shows the distance at which the flame propagates from the ignition position (33) in the jet flow direction of the fuel-containing fluid (11) from the fuel-containing fluid supply nozzle (12) in this embodiment to the center of the fuel jet (unignition distance). FIG. 3 is a cross-sectional view of a burner fuel-containing fluid supply nozzle (12) showing that L1 (FIG. 2 (a)) is reduced as compared to the unignited distance L1 ′ (FIG. 2 (b)) of the prior art. In this embodiment, the distance L2 from the ignition position (33) in the direction perpendicular to the rectangular jet flow of the fuel-containing fluid (11) to the center of the jet flow of the fuel-containing fluid (11) is the distance L2 ′ of the prior art. As the comparison is reduced, the non-ignition distance L1 is greatly reduced as compared with the conventional non-ignition distance L1 ′.

  FIG. 3 shows a structural example of a burner according to an embodiment of the present invention. FIG. 3A shows a cross-sectional arrow view (a cross-sectional view taken along the line B-B in FIG. 3B) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 3B shows a cross-sectional view taken along the line AA in FIG. 3A, and FIG. 3C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  The cylindrical fuel-containing fluid flow path (10) is connected to a fuel-containing fluid supply nozzle (12) having a rectangular cross section via a circular cross-section connection portion (10a), and the fuel-containing fluid supply nozzle (12) is connected to the furnace (4). ) Has a structure sufficient to form a jet flow having a rectangular cross section. Even after the fuel-containing fluid (11) is put into the furnace (4), the fuel-containing fluid (11) spreads along the jet flow direction, and the cross-sectional area of the jet flow of the fuel-containing fluid (11) is enlarged to increase the flow velocity. Therefore, it effectively acts to further reduce the unignited distance L1 shown in FIG. In addition, since the fuel-containing fluid (11) spreads in the furnace (4), the combustion space can be used effectively, the residence time in the furnace becomes longer, and the NOx concentration in the combustion gas is reduced and the combustion efficiency is improved. It works effectively. Around the fuel-containing fluid supply nozzle (12), a combustion air sleeve (15) having a rectangular cross section and a burner throat (16) having a rectangular cross section are arranged.

  FIG. 4 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 4A shows a cross-sectional arrow view (an arrow view of the cross section along line B-B in FIG. 4B) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 4B shows a cross-sectional view taken along the line AA in FIG. 4A, and FIG. 4C shows a front view of the outlet portion of the burner viewed from the furnace (4) side.

  The burner shown in FIG. 4 has an elliptical cross-sectional shape in a direction perpendicular to the jet flow of the fuel-containing fluid (11) of the burner, and the other configuration is the same as that of the burner shown in FIG.

  As a cross-sectional shape in the vertical direction of the burner (direction perpendicular to the jet flow of the fuel-containing fluid (11)), a rectangular shape is shown in FIG. 3 and an elliptical shape is shown in FIG. Even if a similar shape such as an arc shape or a wide diamond shape is employed, the same effect as described above can be obtained.

  FIG. 5 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 5 (a) shows a cross-sectional arrow view (a cross-sectional view taken along the line BB in FIG. 5 (b)) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 5B shows a cross-sectional view taken along line AA in FIG. 5A, and FIG. 5C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  In the burner shown in FIG. 5, the fuel-containing fluid supply nozzle (12) gradually increases in size along the flow direction of the fuel-containing fluid (11) from the fuel-containing fluid connection portion (10a) toward the outlet. However, the size of the minor axis portion is gradually reduced along the flow direction of the fuel-containing fluid (11), and other configurations are the same as those of the burner shown in FIG.

  The feature of the burner structure shown in FIG. 5 is that the increase in the flow rate of the fuel-containing fluid (11) from the fuel-containing fluid connection portion (10a) toward the outlet portion of the fuel-containing fluid supply nozzle (12) can be suppressed, and the pressure loss And the wear of the components in the fuel-containing fluid supply nozzle (12) can be suppressed.

  FIG. 6 shows an example of the structure of a burner according to an embodiment of the present invention. 6 (a) shows a cross-sectional arrow view (an arrow view of the cross section along line BB in FIG. 6 (b)) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 6B shows a cross-sectional view taken along the line AA in FIG. 6A, and FIG. 6C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  In the burner shown in FIG. 6, the fuel-containing fluid (11) flowing in the fuel-containing fluid supply nozzle (12) is supplied uniformly in the direction in which the fuel-containing fluid supply nozzle (12) expands along the jet flow direction. The fuel-containing fluid guide plate (19) is disposed on the other, and the other configuration is the same as that of the burner shown in FIG. In this example, three fuel-containing fluid guide plates (19) are installed, and the fuel-containing fluid (11) is uniformly spread according to the spread of the fuel-containing fluid supply nozzle (12). The guide plates (19) are arranged on the central axis, and the guide plates (19) on both sides sandwiching the guide plate (19) are arranged at angles α and β with respect to a vertical section passing through the central axis.

  Since the flow of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) is divided into a plurality of parts by the fuel-containing fluid guide plate (19), the fuel-containing fluid supply nozzle (10a) is connected to the fuel-containing fluid supply nozzle (12). The fuel-containing fluid (11) is uniformly spread according to the spread of the fuel-containing fluid supply nozzle (12) toward the outlet of (12), and can be burned without imbalance. Further, by uniformly spreading the fuel-containing fluid (11), the effects of suppressing the local increase in the flow velocity, minimizing the pressure loss, and suppressing the wear of the components are further improved than the structure shown in FIG.

  FIG. 7 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 7A shows a cross-sectional arrow view in a direction passing through the central axis of the burner and parallel to the longest diameter of the long diameter portion of the outlet portion, and FIG. 7B is a cross-sectional view taken along the line BB in FIG. FIG. 7 (c) shows an arrow view of the cross section along the line AA in FIG. 7 (a).

  In the burner shown in FIG. 7, the fuel-containing fluid (11) flowing in the fuel-containing fluid supply nozzle (12) is expanded along the flow direction in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be evenly supplied in the direction, passes through the central axis of the fuel-containing fluid supply nozzle (12), and extends to the furnace (4). A guide plate (21a) for changing the direction of the fuel-containing fluid that changes the flow of the fluid (11) downward in the cross-section taken along the line AA of FIG. In the cross section taken along line B-B in (a), a fuel-containing fluid direction changing guide plate (21b) that changes the flow of the fluid (11) upward is provided at the burner outlet. The four fuel-containing fluid jets 20 (20a, 20b) formed by the fuel-containing fluid supply nozzle (12) and the fuel-containing fluid guide plate (19) are connected to the fuel-containing fluid direction changing guide plates (21a, 21b). ), A fuel-containing fluid jet flow (20a) in a downward slanting direction and a fuel-containing fluid jet flow (20b) in a slanting upward direction are formed. The burner configuration shown in FIG. 7 has an effect of promoting the dispersion of the fuel-containing fluid jet stream (20) in the furnace (4) and promoting the combustion in the downstream part of the furnace (4).

  FIG. 8 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 8A shows a cross-sectional view taken in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. 8B is a cross-sectional view taken along the line BB in FIG. Fig. 8 (c) shows an arrow view of the cross section taken along the line AA of Fig. 8 (a).

  In the burner shown in FIG. 8, the fuel-containing fluid (11) flowing in the fuel-containing fluid supply nozzle (12) is expanded along the flow direction in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be evenly supplied in the direction, passes through the central axis of the fuel-containing fluid supply nozzle (12), and extends to the furnace (4). A guide plate (21a) for changing the direction of flow of the fluid 11 in the cross section taken along the line AA to straighten the straight line parallel to the longest diameter of the part is installed, and the line BB is installed. In the cross section, a fuel-containing fluid direction changing guide plate (21b) is installed to change the flow of the fluid (11) upward. The four fuel-containing fluid jets (20a, 20b) formed by the fuel-containing fluid supply nozzle (12) and the fuel-containing fluid guide plate (19) are the fuel-containing fluid direction changing guide plates (21a, 21b). The fuel-containing fluid jet stream (20a) becomes a straight traveling direction and the fuel-containing fluid jet stream (20b) becomes an upward jet.

  The same fuel-containing fluid ejection flow (20a, 20b) is formed even when only the guide plate (21b) that changes the direction without installing the guide plate (21a) for changing the direction of the fuel-containing fluid to be straightened and straightened. Is done.

  With the burner configuration shown in FIG. 8, for example, the fuel-containing fluid jet flow near the water wall on the side wall side of the furnace (4) is made a straight flow, and the fuel-containing fluid jet flow near the water wall on the side wall side of the furnace (4) is made. By making the flow in an oblique direction with respect to the center of the furnace, dispersion of the fuel-containing fluid jet stream (20) in the furnace (4) is promoted, and combustion in the downstream part of the furnace (4) is promoted. This has the effect of maintaining the effect and preventing ash adhesion by suppressing the inflow of flame to the vicinity of the side wall of the furnace (4).

  FIG. 9 shows an example of the structure of a burner according to an embodiment of the present invention. 9 (a) shows a cross-sectional view in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, FIG. 9 (b) shows a perspective view of the burner, and FIG. ) Shows an arrow view of the cross section along line AA in FIG. 9A, and FIG. 9D shows an arrow view of the cross section along line BB of FIG. 9A.

  The burner shown in FIG. 9 is a direction in which the fuel-containing fluid supply nozzle (12) expands along the flow direction of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be supplied evenly. The shape of the front face of the inlet of the fuel-containing fluid nozzle (12) is a parallelogram, and one side surface (12a) of the fuel-containing fluid nozzle (12) is inclined upward along the flow direction and the other side surface ( 12b) is disposed obliquely downward along the flow direction and reaches the outlet of the fuel-containing fluid supply nozzle (12).

  With this configuration, a portion of the fuel-containing fluid supply nozzle (12) close to the side surface (12a) forms an obliquely upward fuel-containing fluid jet flow (20a) as shown in FIG. 9C, and is formed on the side surface (12b). In the near portion, as shown in FIG. 9 (d), an obliquely downward fuel-containing fluid ejection flow (20d) is formed. A fuel-containing fluid having a jet direction in the middle between the fuel-containing fluid jet flow (20a) and the center line from the two central flow paths in which the fuel-containing fluid supply nozzle (12) is partitioned by the fuel-containing fluid guide plate (19). An ejection flow (20b), a fuel-containing fluid ejection flow (20d), and a fuel-containing fluid ejection flow (20c) having an ejection direction in the middle of the center line are formed.

  The effect of the burner configuration in FIG. 9 is the same as that of the burner shown in FIG. 7, but the fuel-containing fluid direction changing guide plate (21) is not used to change the jet direction of the fuel-containing fluid (11). The problem of wear that is concerned about the guide plate (21) does not occur.

  FIG. 10 shows a structural example of a burner according to an embodiment of the present invention. FIG. 10A shows a cross-sectional arrow view (a cross-sectional view taken along the line B-B in FIG. 10B) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 10B shows a cross-sectional view taken along the line AA in FIG. 10A, and FIG. 10C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  A fuel-containing fluid dividing plate (22) is installed at the outlet of the fuel-containing fluid nozzle (12) to partially block the flow perpendicular to the flow of the fuel-containing fluid (11). The fuel-containing fluid jet (20) is divided into four as shown in FIG. 11 by the fuel-containing fluid dividing plate (22). The division increases the surface area of the fuel-containing fluid jet stream (20) to increase the radiation heat reception in the furnace (4), and a negative pressure region (22a) is provided on the downstream side of the fuel-containing fluid divider plate (22). As shown, the surrounding hot gas flows into the negative pressure region as indicated by the arrows in the figure. Both the increase in radiation heat and the inflow of high-temperature gas into the negative pressure region contribute to early ignition of the fuel, and combustion in the reduction region near the burner is promoted, reducing the NOx concentration of combustion gas and improving combustion efficiency. It works effectively.

  FIG. 12 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 12 (a) shows a cross-sectional arrow view (an arrow view of the cross section along line BB in FIG. 12 (b)) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 12B shows an arrow view of the cross section along line AA in FIG. 12A, and FIG. 12C shows a front view of the outlet portion of the burner as seen from the furnace (4) side.

  A fuel-containing fluid dividing plate (partially perpendicular to the flow of the fuel-containing fluid (11) at the outlet of the fuel-containing fluid nozzle (12) and at the outlet of the fuel-containing fluid guide plate (19) 22) is installed. Since the fuel-containing fluid guide plate (19) uniformly supplies the fuel-containing fluid (11) in the fuel-containing fluid supply nozzle (12), NOx reduction and combustion efficiency are more effectively realized.

  FIG. 13 shows a structural example of a burner according to an embodiment of the present invention. FIG. 13 (a) shows a cross-sectional arrow view (a cross-sectional view taken along the line BB in FIG. 13 (b)) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 13B shows a cross-sectional view taken along the line AA of FIG. 13A, and FIG. 13C shows a front view of the outlet portion of the burner viewed from the furnace (4) side.

  A flame holder (17) having an L-shaped cross section is installed at the outlet of the fuel-containing fluid nozzle (12). A circulation vortex (not shown) is formed in the wake of the flame holder (17) to draw high-temperature combustion gas back to the vicinity of the flame holder (17). This contributes to early ignition of the fuel, and the vicinity of the burner. Combustion in the reduction region is promoted and effectively acts to reduce the NOx concentration of the combustion gas and improve the combustion efficiency.

  FIG. 14 shows a structure example of a burner according to an embodiment of the present invention. FIG. 14A shows a cross-sectional arrow view (an arrow view of the cross section along line BB in FIG. 14B) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 14B shows a cross-sectional view taken along the line AA in FIG. 14A, and FIG. 14C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  A secondary air guide plate (17a) is provided at the front end of the L-shaped flame stabilizer (17) shown in FIG. As the secondary air spreads outward by the guide plate (17a), the circulatory vortex (not shown) in the wake of the flame holder (17) increases, and the amount of high-temperature combustion gas recirculation increases, leading to fuel. Is further accelerated, and combustion in the reduction region in the vicinity of the burner is promoted, which effectively acts to reduce the NOx concentration of the combustion gas and improve the combustion efficiency.

  FIG. 15 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 15 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner (arrow view taken along the line BB in FIG. 15 (b)). FIG. 15B shows a cross-sectional view taken along the line AA in FIG. 15A, and FIG. 15C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  In the burner shown in FIG. 15, a tertiary air guide plate (15 a) is installed at the tip of the secondary air sleeve (15) to widen the direction in which the tertiary air is ejected. As the tertiary air spreads outward, the reduction region at the center of the flame is expanded, which effectively acts to reduce NOx concentration and improve combustion efficiency.

  FIG. 16 shows a structural example of a burner according to an embodiment of the present invention. FIG. 16 (a) shows a cross-sectional arrow view (an arrow view of the cross section along line BB in FIG. 16 (b)) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 16B shows an arrow view of the AA line cross section of FIG. 16A, and FIG. 16C shows a front view of the outlet portion of the burner as seen from the furnace (4) side.

  The burner shown in FIG. 16 is a fuel-containing fluid concentrator that combines a triangular prism shape in which the cross-sectional area gradually increases from the upstream side in the fuel-containing fluid supply nozzle (12) and a reverse triangular column shape in which the cross-sectional area gradually decreases on the downstream side. (23) is installed. The fuel-containing fluid concentrator (23) concentrates the fuel near the flame holder (17), contributes to early ignition of the fuel, promotes combustion in the reduction region near the burner, and reduces the NOx concentration of the combustion gas. Effectively reduces and improves combustion efficiency.

  FIG. 17 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 17A shows a cross-sectional arrow view (a cross-sectional view taken along the line B-B in FIG. 17B) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 17B shows a cross-sectional view taken along line AA in FIG. 17A, and FIG. 17C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  The fuel-containing fluid concentrator (23) is a combination of a triangular prism shape whose cross section is gradually widened in the upstream side of the fuel-containing fluid supply nozzle (12), a quadrangular prism shape in the middle, and a reverse triangular column shape whose cross-sectional area is gradually narrowed on the downstream side. ') Is installed. In this configuration, by reducing the angle change around the concentrator (23 '), separation is suppressed, the fuel concentration effect is enhanced, the NOx reduction effect is increased, and the combustion efficiency is improved.

  16 and 17 show an effective configuration example of the concentrator (23, 23 '), but the same effect can be obtained by using a concentrator having a similar structure such as a triangular prism.

  FIG. 18 shows an example of the structure of a burner according to an embodiment of the present invention. 18A is a cross-sectional arrow view parallel to the surface of the fuel-containing fluid supply nozzle (12) formed through the long side of the outlet portion of the nozzle (12) (the line B-B in FIG. 18B). 18 (b) is a sectional view taken along the line AA of FIG. 18 (a), and FIG. 18 (c) is a front view of the outlet portion of the burner as viewed from the furnace (4) side. Indicates.

  In FIG. 18, a weir-like fluid distribution plate (24) is provided at the inlet of the fuel-containing fluid supply nozzle (12). The fuel-containing fluid (11) once collides with the upstream side of the weir-like fluid distribution plate (24) and is evenly dispersed in the long side direction of the fuel-containing fluid supply nozzle (12), and then the fuel-containing fluid (11) It is uniformly guided to the four flow paths partitioned by the fuel-containing fluid guide plate (19) in the fluid supply nozzle (12), and is supplied to the furnace (4) while maintaining an equal state.

  FIG. 19 shows an example in which an oil supply nozzle (41) is installed at the center of the fuel-containing fluid supply nozzle (12). FIG. 19 (a) shows a cross-sectional arrow view (a cross-sectional view taken along line BB in FIG. 19 (b)) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 19B shows a cross-sectional view taken along the line AA of FIG. 19A, and FIG. 19C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  FIG. 20 shows an example in which a gas ejection part connected from the gas introduction pipe (42) to the gas supply nozzle (44) via the horizontal pipe (43) is installed around the flame holder (17).

  FIG. 20A shows a cross-sectional arrow view (a cross-sectional view taken along the line B-B in FIG. 20B) in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner. FIG. 20B shows a cross-sectional view taken along the line AA in FIG. 20A, and FIG. 20C shows a front view of the outlet portion of the burner as viewed from the furnace (4) side.

  The burner structure shown in FIG. 21 is a long side of the fuel-containing fluid supply nozzle (12) whose cross-sectional shape orthogonal to the flow of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) of the burner is rectangular. The front view (FIG. 21 (a)) and top view (FIG.21 (b)) of the fuel containing fluid supply nozzle (12) seen from the furnace (4) side at the time of arrange | positioning up and down are shown.

  When viewed from the front side of the furnace (4), the fuel-containing fluid supply nozzle (12) shown in FIG. 21 has left and right relative to a plane perpendicular to the furnace wall surface in the upward and downward directions on the long side of the nozzle (12). The fuel-containing fluid jets (20a, 20b) are formed so as to incline to opposite sides in the horizontal direction. The formation of the fuel-containing fluid jet is achieved by applying the burner structure of FIG. 7 or FIG.

  The burner structure shown in FIG. 22 is a long side of the fuel-containing fluid supply nozzle (12) having a rectangular cross-sectional shape orthogonal to the flow of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) of the burner. The front view (FIG. 22 (a)) and top view (FIG.22 (b)) of the fuel containing fluid supply nozzle (12) seen from the furnace (4) side at the time of arrange | positioning up and down are shown.

  From the fuel-containing fluid supply nozzle (12) shown in FIG. 22 when viewed from the front side of the furnace (4), one side of the long side of the nozzle (12) is upward and downward with respect to a plane perpendicular to the furnace wall surface. Is inclined in the horizontal direction to form a fuel-containing fluid jet (20b), and the other is perpendicular to the furnace wall to form a fuel-containing fluid jet (20c). The formation of the fuel-containing fluid jet is achieved by applying the burner structure of FIG.

FIG. 23 shows an example in which a large number of fuel-containing fluid supply nozzles (12) shown in FIG. 21 are arranged on one furnace wall surface in three rows in the vertical direction and in four rows in the horizontal direction. In the right half of one furnace wall, a nozzle (12) that forms an ejection flow (20a, 20b) is arranged in the same direction as the fuel-containing fluid supply nozzle (12) shown in FIG. 21, and in the left half of the furnace wall The fuel-containing fluid supply nozzle (12) shown in FIG. 21 and the nozzle (12) for forming the jet flow (20a, 20b) are arranged at the mirror surface target position. By arranging the directions of the fuel-containing fluid jets (20a, 20b) symmetrically on one furnace wall surface, it is possible to maintain a good balance between the left and right flow and combustion state in the furnace (4).
If the jet flow (20a, 20b) from the fuel-containing fluid supply nozzle (12) arranged separately on the left and right halves of one furnace wall is formed at the mirror surface target position, the nozzle (12) The directions of the fuel-containing fluid jets (20a, 20b) need not be as illustrated.

  In FIG. 24, the fuel-containing fluid supply nozzles (12) are arranged on one furnace wall surface in three rows in the vertical direction and in four rows in the horizontal direction, but the fuel-containing fluid supply shown in FIG. An example in which the nozzle (12) is arranged on the mirror surface and the fuel-containing fluid supply nozzle (12) shown in FIG. A burner having a fuel-containing fluid jet flow (20c) and an inclined fuel-containing fluid jet flow (20b) arranged in a straight line is arranged near the water wall of the furnace (4) side wall, and a fuel-containing fluid inclined on both sides is arranged near the center. By arranging the jet flow (20a, 20b), dispersion of the fuel-containing fluid jet flow (20a, 20b) in the furnace (4) is promoted, and combustion in the wake portion of the furnace (4) is promoted. This has the effect of maintaining the effect and preventing ash adhesion by suppressing the inflow of flame to the vicinity of the side wall of the furnace (4).

  In FIG. 25, fuel-containing fluid supply nozzles (12) that form the same fuel-containing fluid jets (20a, 20b) shown in FIG. 21 are arranged as the fuel-containing fluid nozzles (12) of all burners on one furnace wall. An example is shown. In this embodiment, particularly in a small-volume furnace (4), by avoiding collision of fuel-containing fluid jets (20a, 20b), local concentration of fuel is suppressed, and NOx concentration in the combustion gas is reduced. This arrangement is effective for improving combustion efficiency.

  The burner structure shown in FIGS. 21 to 25 can achieve optimum combustion characteristics by appropriately selecting the burner structure in accordance with conditions such as furnace dimensions and burner arrangement.

  FIG. 26 shows a plan view of a furnace wall of a boiler in which a burner according to an embodiment of the present invention is arranged. In FIG. 26, in a boiler having a spiral water wall pipe (25) on the furnace wall, a rectangular opening (26) is installed along the arrangement of the water wall pipe 25 oblique to the horizontal. Various burners described in the embodiments of the present invention are attached. By providing the opening (26) along the spiral water wall pipe (25), the number of water wall pipes (25) required to form the opening (26) can be minimized. It becomes possible and the economy is improved.

  As described above, the combustion apparatus according to each embodiment of the present invention has a feature that the combustion space can be effectively utilized because the fuel-containing fluid jet flow (20) spreads in the furnace (4). By adopting the configuration, the fuel-containing fluid ejection flow (20a, 20b) spreads in the horizontal (width) direction of the furnace (4), so that the distribution of the fuel-containing fluid (11) is made uniform in the furnace horizontal (width) direction. The substantial residence time in the furnace is further increased, and this effectively acts to reduce the NOx concentration in the combustion gas and improve the combustion efficiency.

  FIG. 27 is a plan view of a furnace wall of a boiler in which a burner according to an embodiment of the present invention is arranged. In FIG. 27, in the boiler having the water wall pipe (25) extending in the vertical direction on the furnace wall, a rectangular opening (26) is installed along the arrangement of the water wall pipe (25). The burner of each of the above embodiments is attached. By providing the opening (26) along the water wall pipe (25), it becomes possible to minimize the number of water wall pipes (25) required to form the opening (26), and thus economical. Improves.

  In this configuration, in order to promote the dispersion of the mixed fluid in the horizontal (width) direction of the furnace, the directions of the fuel-containing fluid jets (20a, 20b) are different from each other in the burner shown in FIGS. With this configuration, the dispersion of the entire fuel-containing fluid (11) in the furnace (4) is promoted, which effectively acts on NOx reduction and combustion efficiency improvement.

  Generally, oil or gas is used as auxiliary fuel in the burner. However, even if a nozzle for supplying these fuels is installed in a part of the burner of the embodiment of the present invention, the features and effects of the burner of the embodiment of the present invention are not Maintained.

  The burner structure that can cope with the trend of increasing the capacity of the burner without reducing the combustion performance while reducing the cost has high industrial applicability in the future.

It is explanatory drawing of the ignition area | region of the burner exit of this invention and a prior art. It is explanatory drawing of the unloading area | region of the burner exit of this invention and a prior art. 3 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 3 (a) shows a cross-sectional view in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. Fig. 3 (a) is a cross-sectional view taken along line AA of Fig. 3 (a), and Fig. 3 (c) is a front view of the outlet portion of the burner as viewed from the furnace side. An example of the structure of a burner according to an embodiment of the invention is shown (FIG. 4 (a) shows a cross-sectional view in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. 4 (b). 4A shows a cross-sectional view taken along the line AA in FIG. 4A, and FIG. 4C shows a front view of the outlet portion of the burner as viewed from the furnace side. An example of the structure of a burner according to an embodiment of the present invention is shown (FIG. 5 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the cross section along line AA in FIG. 5 (a), and FIG. 5 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. 6 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 6 (a) shows a cross-sectional view taken in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the AA line cross section of FIG. 6 (a), and FIG. 6 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. 7 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 7 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the section BB in FIG. 7 (a), and FIG. 7 (c) shows an arrow view of the section AA in FIG. 7 (a). An example of the structure of a burner according to an embodiment of the present invention is shown (FIG. 8 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the section BB in FIG. 8 (a), and FIG. 8 (c) shows an arrow view of the section AA in FIG. 8 (a). 9 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 9 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. b) is a perspective view of the burner, FIG. 9C is a cross-sectional view taken along line BB in FIG. 9A, and FIG. 9D is an AA line in FIG. 9A. An arrow view of the cross section is shown.). FIG. 10 (a) shows a cross-sectional arrow in a direction parallel to the longest diameter of the long diameter portion of the outlet portion on the line extending through the central axis of the burner and extending toward the furnace. Fig. 10 (b) shows a view of the section taken along the line AA in Fig. 10 (a), and Fig. 10 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. . Explanatory drawing of the effect by the invention described in FIG. 10 is shown. FIG. 12 shows an example of the structure of the burner according to one embodiment of the invention shown in FIG. 10 (FIG. 12 (a) is a direction parallel to the longest diameter of the long diameter portion of the outlet portion on the line passing through the central axis of the burner and extending toward the furnace. Fig. 12 (b) is a sectional view taken along the line A-A in Fig. 12 (a), and Fig. 12 (c) is a front view of the outlet portion of the burner as seen from the furnace side. Show.) An example of the structure of a burner according to an embodiment of the present invention is shown (FIG. 13 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the AA line cross section of FIG. 13 (a), and FIG. 13 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. 14 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 14 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the AA line cross section of FIG. 14 (a), and FIG. 14 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. An example of the structure of a burner according to an embodiment of the present invention is shown (FIG. 15 (a) shows a cross-sectional view in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the AA line cross section of FIG. 15 (a), and FIG. 15 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. An example of the structure of a burner according to an embodiment of the present invention is shown (FIG. 16 (a) shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the AA line cross section of FIG. 16 (a), and FIG. 16 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. FIG. 17A shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 17A shows a cross-sectional view in the direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, and FIG. (b) shows an arrow view of the AA line cross section of FIG. 17 (a), and FIG. 17 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. An example of the structure of a burner according to an embodiment of the present invention is shown (FIG. 18A is a cross-sectional view parallel to the fuel-containing fluid supply nozzle surface formed through the long side of the outlet portion (FIG. 18B). ) Is a cross-sectional view taken along the line A--B in FIG. 18B, and FIG. 18C is a cross-sectional view taken along the line A-A in FIG. 18A. A front view is shown.). The example which installed the oil supply nozzle in the center part of the fuel containing fluid supply nozzle is shown. The example which installed the gas supply nozzle around the flame holder is shown. A front view (FIG. 21A) and a plan view (FIG. 21B) of the fuel-containing fluid supply nozzle are shown. A front view (Drawing 22 (a)) and a top view (Drawing 22 (b)) of a fuel content fluid supply nozzle to other composition are shown. 21 shows an example in which many of the fuel-containing fluid supply nozzles shown in FIG. 21 are arranged on one furnace wall surface in three rows in the vertical direction and four rows in the horizontal direction. An example in which many of the fuel-containing fluid supply nozzles shown in FIGS. 21 and 22 are arranged on one furnace wall surface in three rows in the vertical direction and in four rows in the horizontal direction. 21 shows another embodiment in which many of the fuel-containing fluid supply nozzles shown in FIG. 21 are arranged on one furnace wall surface in three rows in the vertical direction and in four rows in the horizontal direction. The top view of the furnace wall of the boiler which has arrange | positioned the burner of one Example of this invention is shown. The top view of the furnace wall of the boiler which has arrange | positioned the burner of one Example of this invention is shown. The example of the burner for solid fuel which consists of a prior art is shown (FIG. 28 (a) is a sectional side view of a burner, FIG.28 (b) is the front view which looked at this burner from the inside of a furnace.). FIG. 29A shows a cross-sectional view in the direction along the jet flow of the fuel-containing fluid of the fuel-containing fluid supply nozzle of the conventional burner, and FIG. 29B shows the outlet portion of the fuel-containing fluid supply nozzle on the furnace side. The front view seen from is shown. Fig. 6 schematically shows the behavior of flame propagation in a furnace in a cross-sectional direction along a jet flow of a fuel-containing fluid of a fuel-containing fluid supply nozzle of a prior art burner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Wind box 4 Furnace 10 Fuel containing fluid flow path 10a Fuel containing fluid connection part 11 Fuel containing fluid 12 Fuel containing fluid supply nozzle 13 Secondary air 14 Tertiary air 15 Combustion air sleeve 15a Tertiary air guide plate 16 Burner throat 17 Flame holding Container 17a Secondary air guide plate 19 Fuel-containing fluid guide plate 20, 20a, 20b, 20c, 20d Fuel-containing fluid jet flow 21a, 21b Fuel-containing fluid direction changing guide plate 22 Fuel-containing fluid dividing plate 22a Negative pressure region 23, 23 'concentrator 24 fluid distribution plate 25 water wall pipe 26 opening 31 non-ignition area 32 ignition area 33 ignition position 41 oil supply nozzle 42 gas introduction pipe 43 horizontal pipe 44 gas supply nozzle L1 unignition distance L2 mixed fluid from ignition position Distance to the center of the jet

[0004]
The shape of the long diameter portion of the cross section perpendicular to the flow of the fluid (11) from the connecting portion (10a) of the fluid conveyance channel (10) toward the outlet portion is along the flow direction of the fluid (11). It is a burner having a configuration that gradually expands and the size of the short diameter portion is unchanged.
[0012]
[0013]
[0014]
According to a fourth aspect of the present invention, the fuel-containing fluid supply nozzle (12) has a fuel-containing fluid guide plate (19) that divides the flow of the fuel-containing fluid (11) into a plurality thereof. It is a burner.
[0015]
According to a fifth aspect of the present invention, the fuel-containing fluid guide plate (19) is arranged on a line extending the central axis in the flow direction of the fluid (11) in the fuel-containing fluid supply nozzle (12) into the furnace (4). The burner according to claim 4, which is arranged at a plurality of different inclination angles with respect to a plane parallel to a plane passing through the shortest diameter of the short diameter portion of the nozzle (12).
[0016]
According to a sixth aspect of the invention, the fuel-containing fluid direction changing guide plate (21) in which the fuel-containing fluid supply nozzle (12) forcibly changes the flow direction of the fuel-containing fluid (11) in the outlet thereof. The burner according to any one of claims 1, 4, and 5.
[0017]
According to the seventh aspect of the present invention, the guide plate (21) for changing the direction of fuel-containing fluid passes along a line extending the central axis of the fuel-containing fluid supply nozzle (12) into the furnace (4), and the nozzle (12 The burner according to claim 6, wherein the burner is disposed in a plurality of directions different from each other with respect to a plane parallel to a plane passing through the longest diameter of the long diameter portion.
[0018]
According to the eighth aspect of the present invention, the guide plate (21) for changing the direction of fuel-containing fluid has a center axis of the fuel-containing fluid supply nozzle (12) in the furnace (4) for a part of the fuel-containing fluid (11).

[0005]
Is disposed parallel to a plane parallel to a plane passing through the longest diameter of the long diameter portion of the nozzle (12), and the other fuel-containing fluid (11) is a fuel-containing fluid supply nozzle (12 The central axis of the nozzle (12) passes through a line extending into the furnace (4), and is arranged with an inclination angle with respect to a plane parallel to a plane passing through the longest diameter of the long diameter portion of the nozzle (12). It is a burner of description.
[0019]
According to the ninth aspect of the present invention, the fuel-containing fluid supply nozzle (12) is partitioned into a plurality of flow paths by the fuel-containing fluid guide plate (19), and the central axis of each flow path is a fuel-containing fluid. Furnace (at different inclination angles with respect to the plane parallel to the plane passing through the longest diameter of the long diameter portion of the outlet of the nozzle (12) through the line extending the central axis of the supply nozzle (12) into the furnace (4) The burner according to claim 4, which is provided on the wall surface of 4).
[0020]
According to a tenth aspect of the present invention, a fuel-containing fluid dividing plate (22) capable of dividing the outlet portion into a plurality of portions is provided at the outlet portion of the fuel-containing fluid supply nozzle (12). The burner according to any one of the above.
[0021]
Invention of Claim 11 is a burner in any one of Claim 1, 4-10 which provided the flame holder (17) of the L-shaped cross section in the exit part of the said fuel containing fluid supply nozzle (12). is there.
[0022]
According to a twelfth aspect of the present invention, a guide plate (17a) is provided at the tip of the L-shaped flame stabilizer (17) for changing the direction of jetting of combustion air around the flame stabilizer (17) to the outside. A burner according to claim 11.
[0023]
According to a thirteenth aspect of the present invention, the jet direction of the combustion air outside the one or more combustion air supply nozzles (15) arranged on the outer peripheral portion of the nozzle (12) is extended outward with respect to the fuel jet direction. The burner according to any one of claims 1 to 4, wherein a combustion air guide plate (15a) is provided at a tip of the fuel-containing fluid supply nozzle (12).
[0024]
According to a fourteenth aspect of the present invention, the fuel-containing fluid supply nozzle (12) is provided with a concentrator (23) that once narrows the flow path of the fuel-containing fluid (11) and then expands the flow path again. It is a burner in any one of Claim 1, 4-13.
[0025]
According to a fifteenth aspect of the present invention, in the inlet portion of the fuel-containing fluid supply nozzle (12), a fluid distribution plate (24) for evenly distributing fuel in the nozzle (12) is provided. The burner according to any one of 14.

[0006]
[0026]
According to a sixteenth aspect of the present invention, a fuel-containing fluid is supplied to a nozzle (41, 44) that ejects liquid fuel or gaseous fuel as auxiliary fuel in the vicinity of the fluid (11) ejected from the fuel-containing fluid supply nozzle (12). It is a burner in any one of Claims 1, 4-15 provided in the nozzle (12) vicinity.
[0027]
In the invention described in claim 17, the burners according to claims 1, 4 to 16 are arranged in a plurality of stages in the vertical direction on two opposing furnace walls, and the plurality of burners provided in each stage are in the horizontal direction of the same furnace wall. It is a combustion device arranged symmetrically in the wall surface area divided into two at the central part of the width.
[0028]
In the invention described in claim 18, the burners described in claims 1 and 4 to 16 are arranged in a plurality of stages in the vertical direction on two opposing furnace walls, and among the plurality of burners provided in each stage of the same furnace wall. Adjacent burners in the horizontal direction are burners having the same structure.
[0029]
The invention according to claim 19 is a boiler including a furnace wall configured by spirally winding a water wall pipe (25) inclined in the horizontal direction along the longitudinal direction of the water wall pipe (25). A rectangular, elliptical or substantially elliptical opening (26) is provided in the furnace wall, and the burner according to any one of claims 1, 4 to 16 is attached to the opening (26).
[0030]
The invention according to claim 20 is a boiler having a furnace wall composed of a group of water wall pipes (25) extending in a vertical direction, and is rectangular and elliptical along the longitudinal direction of the water wall pipe (25). Or it is a boiler which provides the substantially elliptical opening part (26) in a furnace wall, and attaches the burner in any one of Claim 1, 4-16 to the said opening part (26).
Effect of the Invention [0031]
According to the first aspect of the present invention, even if the burner capacity is increased, it is possible to suppress the expansion of the unignited region, and the fuel-containing fluid can be maintained even after the fuel-containing fluid (11) is put into the furnace (4). (11) spreads in the width direction, and the cross-sectional area of the jet flow of the fuel-containing fluid (11) is enlarged and the flow velocity is reduced, so that it is effective for reducing the unignited distance compared to the prior art. Because the fuel-containing fluid (11) spreads in the furnace (4), the combustion space can be used effectively, and the residence time in the furnace becomes longer, and the effect of reducing NOx concentration in combustion gas and improving combustion efficiency There is. Further, since the size of the short diameter portion of the fuel-containing fluid supply nozzle (12) is unchanged, it is effective for simplifying the structure. In addition, since the upstream flow velocity of the fuel-containing fluid supply nozzle (12) can be increased, it is effective for preventing flashback in the case of fuel that is easily ignited.

[0007]
[0032]
[0033]
[0034]
According to the fourth and fifth aspects of the present invention, the flow of the fuel-containing fluid (11) is divided into a plurality of parts by the fuel-containing fluid guide plate (19) inside the fuel-containing fluid supply nozzle (12). The fuel-containing fluid (11) is evenly supplied from the fluid connection (10a) toward the outlet of the fuel-containing fluid supply nozzle (12) in the direction in which the nozzle (12) expands, reducing NOx and improving combustion efficiency. Further, the effect of suppressing the increase in flow velocity, minimizing the pressure loss, and the effect of suppressing the wear of the component parts are further improved than those of the invention of the first aspect.
[0035]
According to invention of Claim 6, dispersion | distribution in the furnace (4) of a fuel containing fluid jet flow (20) is accelerated | stimulated, and it has the effect that combustion in a furnace (4) wake part is accelerated | stimulated.
[0036]
According to the seventh aspect of the present invention, the fuel-containing fluid guide plate (19) passes through a line extending the central axis of the fuel-containing fluid supply nozzle (12) into the furnace (4), and the nozzle (12). Since they are arranged in directions opposite to each other with respect to a plane parallel to the plane passing through the longest diameter of the long diameter portion, the fuel-containing fluid (11) is jetted into the furnace (4) in two or more groups. The fuel-containing fluid jet stream (20) can be grouped with a simple structure, the dispersion of the fuel-containing fluid jet stream (20) in the furnace (4) is promoted, and the wake of the furnace (4) This has the effect of promoting combustion in the part.
[0037]
According to the invention described in claim 8, the four fuel-containing fluid jets (20) formed by the fuel-containing fluid supply nozzle (12) and the fuel-containing fluid guide plate (19) are divided into two groups (20a, 20b). ), For example, the fuel-containing fluid jet stream (20a) near the furnace side wall is made a straight flow, and the fuel-containing fluid jet stream (20b) not near the furnace side wall is jetted with an inclination in the horizontal direction. While maintaining the promotion of combustion in the downstream part of the furnace due to the dispersion of the ash, there is an effect of preventing ash adhesion by suppressing the inflow of the flame to the vicinity of the furnace side wall.

[0009]
The fuel concentration at the inlet of 12) is made uniform, and the unbalance of the fuel concentration flowing into each flow path partitioned by the fuel-containing fluid guide plate (19) is suppressed to promote NOx reduction and combustion efficiency improvement. It is effective to do.
[0045]
According to the sixteenth aspect of the invention, liquid fuel or gaseous fuel is jetted to the burner outlet, so that the fuel-containing fluid (11) containing solid fuel can be ignited reliably.
[0046]
According to the invention described in claim 17, a plurality of stages of the burners according to any one of claims 1, 4 to 16 are arranged in the vertical direction on the opposing furnace walls of the opposed combustion type furnace (4), Are arranged symmetrically in the wall surface area divided into two at the center of the horizontal width of the same furnace wall, so that the direction of the fluid jet flow (20a, 20b) is symmetrical with respect to one furnace wall surface. It is possible to maintain the right and left balance of the flow and combustion state in the furnace (4).
[0047]
According to the invention of claim 18, the burners according to any one of claims 1, 4 to 16 are arranged in a plurality of stages in the vertical direction on two opposing furnace walls of the opposed combustion type furnace (4), Among the plurality of burners provided in each stage of the same furnace wall, the horizontally adjacent burners are of the same structure, so that the fuel-containing fluid jet flow (20a, 20a, By avoiding the collision 20b), the local concentration of the fuel is suppressed, and the NOx concentration in the combustion gas is reduced and the combustion efficiency is improved.
[0048]
According to the nineteenth aspect of the present invention, it is necessary to form the opening (26) by arranging the longitudinal direction of the water wall pipe (25) and the longitudinal direction of the long diameter portion of the opening (26). It is economical because the number of the spiral water wall pipes (25) can be reduced, and the water wall pipe (25) can be processed and a boiler with less bent parts can be constructed. It becomes possible to minimize the number of spiral water wall pipes (25) required to form the opening (26), and the economy is improved. Further, since the fuel-containing fluid (11) spreads in the horizontal (width) direction of the furnace (4), the distribution of the fuel-containing fluid (11) is made uniform in the horizontal (width) direction of the furnace, and the substantial residence time in the furnace. Further, the length is increased, and the NOx concentration in the combustion gas is reduced and the combustion efficiency is improved.
[0049]
According to the invention of claim 20, since the rectangular opening (26) is installed along the arrangement of the water wall pipe (25) in the vertical direction on the furnace wall, the length of the water wall pipe (25) is set. By aligning the direction and the longitudinal direction of the long diameter portion of the opening (26), processing and bending of the water wall pipe (25)

[0011]
As the distance L2 from the ignition position (33) in the direction orthogonal to the rectangular jet flow is reduced compared to the distance L2 ′ of the prior art, the unignited distance L1 becomes the unignited distance L1 ′ of the prior art. Compared to a significant reduction.
[0054]
FIG. 3 shows a structural example of a burner according to an embodiment of the present invention. FIG. 3A is a cross-sectional view taken in the direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet (an arrow view taken along the line BB in FIG. 3B). 3 (b) shows a cross-sectional view taken along the line AA in FIG. 3 (a), and FIG. 3 (c) shows a front view of the outlet portion of the burner as viewed from the furnace (4) side. .
[0055]
The cylindrical fuel-containing fluid flow path (10) is connected to a fuel-containing fluid supply nozzle (12) having a rectangular cross section via a circular cross-section connection portion (10a), and the fuel-containing fluid supply nozzle (12) is connected to the furnace (4). ) Has a structure sufficient to form a jet flow having a rectangular cross section. Even after the fuel-containing fluid (11) is put into the furnace (4), the fuel-containing fluid (11) spreads along the jet flow direction, and the cross-sectional area of the jet flow of the fuel-containing fluid (11) is enlarged to increase the flow velocity. Therefore, it effectively acts to further reduce the unignited distance L1 shown in FIG. In addition, since the fuel-containing fluid (11) spreads in the furnace (4), the combustion space can be used effectively, the residence time in the furnace becomes longer, and the NOx concentration in the combustion gas is reduced and the combustion efficiency is improved. It works effectively. Around the fuel-containing fluid supply nozzle (12), a combustion air sleeve (15) having a rectangular cross section and a burner throat (16) having a rectangular cross section are arranged.
[0056]
FIG. 4 shows an example of the structure of a burner according to an embodiment of the present invention. 4A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 4B). 4 (b) shows an arrow view of the cross section along line AA in FIG. 4 (a), and FIG. 4 (c) shows a front view of the outlet portion of the burner as seen from the furnace (4) side. .
[0057]
The burner shown in FIG. 4 has an elliptical cross-sectional shape in a direction perpendicular to the jet flow of the fuel-containing fluid (11) of the burner, and the other configuration is the same as that of the burner shown in FIG.
[0058]
As a cross-sectional shape in the vertical direction of the burner (direction perpendicular to the jet flow of the fuel-containing fluid (11)), a rectangular shape is shown in FIG. 3 and an elliptical shape is shown in FIG. Even if a similar shape such as an arc shape or a wide diamond shape is employed, the same effect as described above can be obtained.
[0059]
FIG. 5 shows an example of the structure of a burner according to an embodiment of the present invention. Fig. 5 (a) shows the central axis of the burner.

[0012]
FIG. 5 (b) shows a cross-sectional arrow view in the direction parallel to the plane passing through the longest diameter of the long diameter portion of the exit portion (arrow view taken along the line BB in FIG. 5 (b)). An arrow view of the AA line section of (a) is shown, and Drawing 5 (c) shows the front view which looked at the exit part of a burner from the furnace (4) side.
[0060]
In the burner shown in FIG. 5, the fuel-containing fluid supply nozzle (12) gradually increases in size along the flow direction of the fuel-containing fluid (11) from the fuel-containing fluid connection portion (10a) toward the outlet. However, the size of the minor axis portion is gradually reduced along the flow direction of the fuel-containing fluid (11), and other configurations are the same as those of the burner shown in FIG.
[0061]
The feature of the burner structure shown in FIG. 5 is that the increase in the flow rate of the fuel-containing fluid (11) from the fuel-containing fluid connection portion (10a) toward the outlet portion of the fuel-containing fluid supply nozzle (12) can be suppressed, and the pressure loss And the wear of the components in the fuel-containing fluid supply nozzle (12) can be suppressed.
[0062]
FIG. 6 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 6A is a cross-sectional arrow view in a direction parallel to the plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 6B). 6 (b) shows an arrow view of the cross section along line AA in FIG. 6 (a), and FIG. 6 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0063]
In the burner shown in FIG. 6, the fuel-containing fluid (11) flowing in the fuel-containing fluid supply nozzle (12) is supplied uniformly in the direction in which the fuel-containing fluid supply nozzle (12) expands along the jet flow direction. The fuel-containing fluid guide plate (19) is disposed on the other, and the other configuration is the same as that of the burner shown in FIG. In this example, three fuel-containing fluid guide plates (19) are installed, and the fuel-containing fluid (11) is uniformly spread according to the spread of the fuel-containing fluid supply nozzle (12). The guide plates (19) are arranged on the central axis, and the guide plates (19) on both sides sandwiching the guide plate (19) are arranged at angles α and β with respect to a vertical section passing through the central axis.
[0064]
Since the flow of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) is divided into a plurality of parts by the fuel-containing fluid guide plate (19), the fuel-containing fluid supply nozzle (10a) is connected to the fuel-containing fluid supply nozzle (12). The fuel-containing fluid (11) is uniformly spread according to the spread of the fuel-containing fluid supply nozzle (12) toward the outlet of (12), and can be burned without imbalance. Further, the fuel-containing fluid (11) is uniformly spread, thereby suppressing the local increase in flow velocity, minimizing the pressure loss, and suppressing the wear of the component parts as shown in FIG.

[0013]
And get better.
[0065]
FIG. 7 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 7 (a) shows a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion, and FIG. An arrow view of the B line cross section is shown in FIG. 7C, and an arrow view of the AA line cross section of FIG. 7A is shown.
[0066]
In the burner shown in FIG. 7, the fuel-containing fluid (11) flowing in the fuel-containing fluid supply nozzle (12) is expanded along the flow direction in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be evenly supplied in the direction, passes through the central axis of the fuel-containing fluid supply nozzle (12), and extends to the furnace (4). The guide plate (21a) for changing the direction of the fuel-containing fluid that changes the flow of the fluid (11) downward in the cross-section taken along the line AA of FIG. In the cross section along line B-B in a), a fuel-containing fluid direction changing guide plate (21b) that changes the flow of the fluid (11) upward is installed at the burner outlet. The four fuel-containing fluid jets 20 (20a, 20b) formed by the fuel-containing fluid supply nozzle (12) and the fuel-containing fluid guide plate (19) are connected to the fuel-containing fluid direction changing guide plates (21a, 21b). ), A fuel-containing fluid jet flow (20a) in a downward slanting direction and a fuel-containing fluid jet flow (20b) in a slanting upward direction are formed. The burner configuration shown in FIG. 7 has an effect of promoting the dispersion of the fuel-containing fluid jet stream (20) in the furnace (4) and promoting the combustion in the downstream part of the furnace (4).
[0067]
FIG. 8 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 8A shows a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion, and FIG. An arrow view of the B line section is shown in FIG. 8C, and an arrow view of the AA line section of FIG. 8A is shown.
[0068]
In the burner shown in FIG. 8, the fuel-containing fluid (11) flowing in the fuel-containing fluid supply nozzle (12) is expanded along the flow direction in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be evenly supplied in the direction, passes through the central axis of the fuel-containing fluid supply nozzle (12), and extends to the furnace (4). A guide plate (21a) for changing the direction of the flow of the fluid 11 in the cross section taken along the line AA with respect to a plane passing through the longest diameter of the part is installed, and a cross section taken along the line BB is installed. Is provided with a fuel-containing fluid direction changing guide plate (21b) that changes the flow of the fluid (11) upward. Fuel-containing fluid supply nozzle (12) and fuel-containing fluid guide plate (

[0014]
19) and the four fuel-containing fluid jets (20a, 20b) formed by the fuel-containing fluid direction changing guide plates (21a, 21b), the fuel-containing fluid jets (20a) are linearly moved. The fuel-containing fluid jet stream (20b) is an upward jet.
[0069]
The same fuel-containing fluid ejection flow (20a, 20b) is formed even when only the guide plate (21b) that changes the direction without installing the guide plate (21a) for changing the direction of the fuel-containing fluid to be straightened and straightened. Is done.
[0070]
With the burner configuration shown in FIG. 8, for example, the fuel-containing fluid jet flow near the water wall on the side wall side of the furnace (4) is made a straight flow, and the fuel-containing fluid jet flow near the water wall on the side wall side of the furnace (4) is made. By making the flow in an oblique direction with respect to the center of the furnace, dispersion of the fuel-containing fluid jet stream (20) in the furnace (4) is promoted, and combustion in the downstream part of the furnace (4) is promoted. This has the effect of maintaining the effect and preventing ash adhesion by suppressing the inflow of flame to the vicinity of the side wall of the furnace (4).
[0071]
FIG. 9 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 9A shows a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the outlet portion, and FIG. 9B shows a perspective view of the burner. 9 (c) shows an arrow view of the section AA in FIG. 9 (a), and FIG. 9 (d) shows an arrow view of the section BB in FIG. 9 (a).
[0072]
The burner shown in FIG. 9 is a direction in which the fuel-containing fluid supply nozzle (12) expands along the flow direction of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be supplied evenly. The shape of the front face of the inlet of the fuel-containing fluid nozzle (12) is a parallelogram, and one side surface (12a) of the fuel-containing fluid nozzle (12) is inclined upward along the flow direction and the other side surface ( 12b) is disposed obliquely downward along the flow direction and reaches the outlet of the fuel-containing fluid supply nozzle (12).
[0073]
With this configuration, a portion of the fuel-containing fluid supply nozzle (12) close to the side surface (12a) forms an obliquely upward fuel-containing fluid jet flow (20a) as shown in FIG. 9C, and is formed on the side surface (12b). In the near portion, as shown in FIG. 9 (d), an obliquely downward fuel-containing fluid ejection flow (20d) is formed. A fuel-containing fluid having a jet direction in the middle between the fuel-containing fluid jet flow (20a) and the center line from the two central flow paths in which the fuel-containing fluid supply nozzle (12) is partitioned by the fuel-containing fluid guide plate (19). Jetted between the jet stream (20b), fuel-containing fluid jet stream (20d), and the center line

[0015]
A fuel-containing fluid jet stream (20c) having a direction is formed.
[0074]
The effect of the burner configuration in FIG. 9 is the same as that of the burner shown in FIG. 7, but the fuel-containing fluid direction changing guide plate (21) is not used to change the jet direction of the fuel-containing fluid (11). The problem of wear that is concerned about the guide plate (21) does not occur.
[0075]
FIG. 10 shows a structural example of a burner according to an embodiment of the present invention. 10A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 10B). FIG. 10 (b) shows a cross-sectional view taken along the line AA of FIG. 10 (a), and FIG. 10 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0076]
A fuel-containing fluid dividing plate (22) is installed at the outlet of the fuel-containing fluid nozzle (12) to partially block the flow perpendicular to the flow of the fuel-containing fluid (11). The fuel-containing fluid jet (20) is divided into four as shown in FIG. 11 by the fuel-containing fluid dividing plate (22). The division increases the surface area of the fuel-containing fluid jet stream (20) to increase the radiation heat reception in the furnace (4), and a negative pressure region (22a) is provided on the downstream side of the fuel-containing fluid divider plate (22). As shown, the surrounding hot gas flows into the negative pressure region as indicated by the arrows in the figure. Both the increase in radiation heat and the inflow of high-temperature gas into the negative pressure region contribute to early ignition of the fuel, and combustion in the reduction region near the burner is promoted, reducing the NOx concentration of combustion gas and improving combustion efficiency. It works effectively.
[0077]
FIG. 12 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 12A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 12B). FIG. 12 (b) shows a cross-sectional view taken along the line AA of FIG. 12 (a), and FIG. 12 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0078]
A fuel-containing fluid dividing plate (partially perpendicular to the flow of the fuel-containing fluid (11) at the outlet of the fuel-containing fluid nozzle (12) and at the outlet of the fuel-containing fluid guide plate (19) 22) is installed. Since the fuel-containing fluid guide plate (19) uniformly supplies the fuel-containing fluid (11) in the fuel-containing fluid supply nozzle (12), NOx reduction and combustion efficiency are more effectively realized.
[0079]
FIG. 13 shows a structural example of a burner according to an embodiment of the present invention. FIG. 13A is a cross-sectional view taken along a line parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (BB in FIG. 13B).

[0016]
Fig. 13 (b) shows an arrow view of the AA line cross section of Fig. 13 (a), and Fig. 13 (c) shows the outlet of the burner at the furnace (4) side. The front view seen from is shown.
[0080]
A flame holder (17) having an L-shaped cross section is installed at the outlet of the fuel-containing fluid nozzle (12). A circulation vortex (not shown) is formed in the wake of the flame holder (17) to draw high-temperature combustion gas back to the vicinity of the flame holder (17). This contributes to early ignition of the fuel, and the vicinity of the burner. Combustion in the reduction region is promoted and effectively acts to reduce the NOx concentration of the combustion gas and improve the combustion efficiency.
[0081]
FIG. 14 shows a structure example of a burner according to an embodiment of the present invention. 14A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 14B). FIG. 14 (b) shows an arrow view of the cross section along line AA of FIG. 14 (a), and FIG. 14 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0082]
A secondary air guide plate (17a) is provided at the front end of the L-shaped flame stabilizer (17) shown in FIG. As the secondary air spreads outward by the guide plate (17a), the circulatory vortex (not shown) in the wake of the flame holder (17) increases, and the amount of high-temperature combustion gas recirculation increases, leading to fuel. Is further accelerated, and combustion in the reduction region in the vicinity of the burner is promoted, which effectively acts to reduce the NOx concentration of the combustion gas and improve the combustion efficiency.
[0083]
FIG. 15 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 15A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 15B). FIG. 15 (b) shows a cross-sectional view taken along the line AA of FIG. 15 (a), and FIG. 15 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0084]
In the burner shown in FIG. 15, a tertiary air guide plate (15 a) is installed at the tip of the secondary air sleeve (15) to widen the direction in which the tertiary air is ejected. As the tertiary air spreads outward, the reduction region at the center of the flame is expanded, which effectively acts to reduce NOx concentration and improve combustion efficiency.
[0085]
FIG. 16 shows a structural example of a burner according to an embodiment of the present invention. FIG. 16A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 16B). FIG. 16B shows an arrow view of the cross section along line AA in FIG.

[0017]
6 (c) shows a front view of the outlet of the burner as seen from the furnace (4) side.
[0086]
The burner shown in FIG. 16 is a fuel-containing fluid concentrator that combines a triangular prism shape in which the cross-sectional area gradually increases from the upstream side in the fuel-containing fluid supply nozzle (12) and a reverse triangular column shape in which the cross-sectional area gradually decreases on the downstream side. (23) is installed. The fuel-containing fluid concentrator (23) concentrates the fuel near the flame holder (17), contributes to early ignition of the fuel, promotes combustion in the reduction region near the burner, and reduces the NOx concentration of the combustion gas. Effectively reduces and improves combustion efficiency.
[0087]
FIG. 17 shows an example of the structure of a burner according to an embodiment of the present invention. FIG. 17A is a cross-sectional view taken in the direction parallel to the plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (arrow view taken along the line BB in FIG. 17B). FIG. 17 (b) shows a cross-sectional view taken along line AA of FIG. 17 (a), and FIG. 17 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0088]
The fuel-containing fluid concentrator (23) is a combination of a triangular prism shape whose cross section is gradually widened in the upstream side of the fuel-containing fluid supply nozzle (12), a quadrangular prism shape in the middle, and a reverse triangular column shape whose cross-sectional area is gradually narrowed on the downstream side. ') Is installed. In this configuration, the change in the angle around the concentrator (23 ′) is reduced, so that separation is suppressed, the fuel concentration effect is enhanced, the NOx reduction effect is increased, and the combustion efficiency is improved.
[0089]
16 and 17 show an effective configuration example of the concentrator (23, 23 '), but the same effect can be obtained even if a concentrator having a similar structure such as a triangular prism is used.
[0090]
FIG. 18 shows an example of the structure of a burner according to an embodiment of the present invention. 18A is a cross-sectional arrow view parallel to the surface of the fuel-containing fluid supply nozzle (12) formed through the long side of the outlet portion of the nozzle (12) (the line B-B in FIG. 18B). 18 (b) is a sectional view taken along the line AA of FIG. 18 (a), and FIG. 18 (c) is a front view of the outlet portion of the burner as viewed from the furnace (4) side. Indicates.
[0091]
In FIG. 18, a weir-like fluid distribution plate (24) is provided at the inlet of the fuel-containing fluid supply nozzle (12). The fuel-containing fluid (11) once collides with the upstream side of the weir-like fluid distribution plate (24) and is evenly dispersed in the long side direction of the fuel-containing fluid supply nozzle (12), and then the fuel-containing fluid (11) It is uniformly guided to the four flow paths partitioned by the fuel-containing fluid guide plate (19) in the fluid supply nozzle (12), and is supplied to the furnace (4) while maintaining an equal state.
[0092]
FIG. 19 shows an example in which an oil supply nozzle (41) is installed at the center of the fuel-containing fluid supply nozzle (12).

[0018]
Indicates. FIG. 19A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 19B). FIG. 19 (b) shows a cross-sectional view taken along the line AA of FIG. 19 (a), and FIG. 19 (c) shows a front view of the outlet portion of the burner viewed from the furnace (4) side. .
[0093]
FIG. 20 shows an example in which a gas ejection part connected from the gas introduction pipe (42) to the gas supply nozzle (44) via the horizontal pipe (43) is installed around the flame holder (17).
[0094]
20A is a cross-sectional arrow view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion (an arrow view of the cross section along line BB in FIG. 20B). 20 (b) shows an arrow view of the cross section along line AA of FIG. 20 (a), and FIG. 20 (c) shows a front view of the outlet portion of the burner as seen from the furnace (4) side. .
[0095]
The burner structure shown in FIG. 21 is a long side of the fuel-containing fluid supply nozzle (12) whose cross-sectional shape orthogonal to the flow of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) of the burner is rectangular. The front view (FIG. 21 (a)) and top view (FIG.21 (b)) of the fuel containing fluid supply nozzle (12) seen from the furnace (4) side at the time of arrange | positioning up and down are shown.
[0096]
When viewed from the front side of the furnace (4), the fuel-containing fluid supply nozzle (12) shown in FIG. 21 has left and right relative to a plane perpendicular to the furnace wall surface in the upward and downward directions on the long side of the nozzle (12). The fuel-containing fluid jets (20a, 20b) are formed so as to incline to opposite sides in the horizontal direction. The formation of the fuel-containing fluid jet is achieved by applying the burner structure of FIG. 7 or FIG.
[0097]
The burner structure shown in FIG. 22 is a long side of the fuel-containing fluid supply nozzle (12) having a rectangular cross-sectional shape orthogonal to the flow of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) of the burner. The front view (FIG. 22 (a)) and top view (FIG.22 (b)) of the fuel containing fluid supply nozzle (12) seen from the furnace (4) side at the time of arrange | positioning up and down are shown.
[0098]
From the fuel-containing fluid supply nozzle (12) shown in FIG. 22 when viewed from the front side of the furnace (4), one side of the long side of the nozzle (12) is upward and downward with respect to a plane perpendicular to the furnace wall surface. Is inclined in the horizontal direction to form a fuel-containing fluid jet (20b), and the other is perpendicular to the furnace wall to form a fuel-containing fluid jet (20c). The formation of the fuel-containing fluid jet is achieved by applying the burner structure of FIG.

[0021]
BRIEF DESCRIPTION OF THE DRAWINGS [0109]
[FIG. 1] It is explanatory drawing of the ignition area | region of the burner exit of this invention and a prior art.
[FIG. 2] It is explanatory drawing of the unloading area | region of the burner exit of this invention and a prior art.
FIG. 3 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 3 (a) is a sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion. 3 (b) shows a cross-sectional view taken along the line AA of FIG. 3 (a), and FIG. 3 (c) shows a front view of the outlet portion of the burner as seen from the furnace side.
FIG. 4 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 4 (a) shows a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the outlet portion. 4 (b) shows an arrow view of the AA line cross section of FIG. 4 (a), and FIG. 4 (c) shows a front view of the outlet portion of the burner as seen from the furnace side.
FIG. 5 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 5 (a) is a sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion. FIG. 5 (b) shows a cross-sectional view taken along the line AA in FIG. 5 (a), and FIG. 5 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. .
FIG. 6 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 6 (a) is a sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion. FIG. 6 (b) shows a cross-sectional view taken along the line AA of FIG. 6 (a), and FIG. 6 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. .
FIG. 7 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 7 (a) is a sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion. FIG. 7 (b) shows an arrow view of the cross section along line BB in FIG. 7 (a), and FIG. 7 (c) shows an arrow view of the cross section along line AA in FIG. 7 (a). Show.)
FIG. 8 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 8 (a) is a cross-sectional view in the direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the outlet portion. 8 (b) shows an arrow view of the section BB in FIG. 8 (a), and FIG. 8 (c) shows an arrow view of the section AA in FIG. 8 (a). Show.)
FIG. 9 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 9 (a) passes through the central axis of the burner.

[0022]
FIG. 9B is a perspective view of the burner in a direction parallel to the plane passing through the longest diameter of the long diameter portion of the outlet portion, FIG. 9C is a perspective view of the burner, and FIG. An arrow view of the cross section taken along line -B is shown, and FIG. 9D shows an arrow view of the cross section taken along line AA of FIG. ).
FIG. 10 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 10 (a) is a plane passing through the longest diameter of the long diameter portion of the outlet portion on the line passing through the central axis of the burner and extending toward the furnace. Fig. 10 (b) shows a cross-sectional view taken along the line A-A in Fig. 10 (a), and Fig. 10 (c) shows the outlet of the burner from the furnace side. A front view is shown.)
[FIG. 11] An explanatory view of the effect of the invention shown in FIG. 10 is shown.
FIG. 12 shows an example of the structure of the burner according to one embodiment of the invention shown in FIG. 10 (FIG. 12 (a) shows the longest diameter of the long diameter portion of the outlet portion on the line passing through the central axis of the burner and extending toward the furnace. Fig. 12 (b) shows a cross-sectional arrow view in a direction parallel to the plane passing through Fig. 12 (a), and Fig. 12 (c) shows the outlet portion of the burner. Front view seen from the furnace side.)
FIG. 13 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 13 (a) is a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the outlet portion. FIG. 13 (b) shows a cross-sectional view taken along the line AA of FIG. 13 (a), and FIG. 13 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. .
FIG. 14 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 14 (a) is a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the outlet portion. FIG. 14 (b) shows a cross-sectional view taken along the line AA of FIG. 14 (a), and FIG. 14 (c) shows a front view of the burner outlet viewed from the furnace side. .
FIG. 15 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 15 (a) is a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the outlet portion. FIG. 15 (b) shows a cross-sectional view taken along the line AA of FIG. 15 (a), and FIG. 15 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. .
FIG. 16 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 16 (a) is a cross-sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion. FIG. 16 (b) shows a cross-sectional view taken along the line AA of FIG. 16 (a), and FIG. 16 (c) shows a front view of the outlet portion of the burner as seen from the furnace side. .

[0023]
FIG. 17 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 17 (a) is a sectional view in a direction parallel to a plane passing through the central axis of the burner and passing through the longest diameter of the long diameter portion of the outlet portion. FIG. 17 (b) shows a cross-sectional view taken along the line AA of FIG. 17 (a), and FIG. 17 (c) is a front view of the outlet portion of the burner viewed from the furnace (4) side. Show.)
FIG. 18 shows an example of the structure of a burner according to an embodiment of the present invention (FIG. 18 (a) is a cross-sectional arrow view parallel to the fuel-containing fluid supply nozzle surface formed through the long side of the outlet portion ( 18 (b) is a cross-sectional view taken along the line BB in FIG. 18 (b), FIG. 18 (b) is a cross-sectional view taken along the line AA in FIG. 18 (a), and FIG. The front view seen from the side is shown.).
FIG. 19 shows an example in which an oil supply nozzle is installed at the center of a fuel-containing fluid supply nozzle.
FIG. 20 shows an example in which a gas supply nozzle is installed around the flame holder.
FIG. 21 shows a front view (FIG. 21A) and a plan view (FIG. 21B) of the fuel-containing fluid supply nozzle.
FIG. 22 shows a front view (FIG. 22A) and a plan view (FIG. 22B) of a fuel-containing fluid supply nozzle for another configuration.
FIG. 23 shows an example in which a large number of fuel-containing fluid supply nozzles shown in FIG. 21 are arranged on one furnace wall surface in three rows in the vertical direction and in four rows in the horizontal direction.
FIG. 24 shows an example in which many fuel-containing fluid supply nozzles shown in FIGS. 21 and 22 are arranged in three rows in the vertical direction and four rows in the horizontal direction on one furnace wall surface.
FIG. 25 shows another embodiment in which many fuel-containing fluid supply nozzles shown in FIG. 21 are arranged on one furnace wall surface in three rows in the vertical direction and in four rows in the horizontal direction.
FIG. 26 shows a plan view of a furnace wall of a boiler in which a burner according to an embodiment of the present invention is arranged.
FIG. 27 is a plan view of a furnace wall of a boiler in which a burner according to an embodiment of the present invention is arranged.
[FIG. 28] An example of a conventional solid fuel burner is shown (FIG. 28 (a) is a side sectional view of the burner, and FIG. 28 (b) is a front view of the burner as seen from inside the furnace).
[FIG. 29] FIG. 29 (a) shows a sectional view in the direction along the jet flow of the fuel-containing fluid of the fuel-containing fluid supply nozzle of the prior art burner, and FIG. 29 (b) shows the outlet of the fuel-containing fluid supply nozzle. The front view which looked at the part from the furnace side is shown.
FIG. 30 schematically shows the behavior of flame propagation in the furnace in the cross-sectional direction along the jet flow of the fuel-containing fluid of the fuel-containing fluid supply nozzle of the prior art burner.

FIG. 9 shows an example of the structure of a burner according to an embodiment of the present invention. 9 (a) shows a cross-sectional view in a direction parallel to the longest diameter of the long diameter portion of the outlet portion through the central axis of the burner, FIG. 9 (b) shows a perspective view of the burner, and FIG. ) Shows a cross - sectional view taken along the line BB in FIG. 9A, and FIG. 9D shows a cross - sectional view taken along the line AA in FIG. 9A.

The burner shown in FIG. 9 is a direction in which the fuel-containing fluid supply nozzle (12) expands along the flow direction of the fuel-containing fluid (11) flowing through the fuel-containing fluid supply nozzle (12) in the same manner as the burner shown in FIG. The fuel-containing fluid guide plate (19) is arranged so as to be supplied evenly. The shape of the front face of the inlet portion of the fuel-containing fluid supply nozzle (12) is a parallelogram, and one side surface (12a) of the fuel-containing fluid supply nozzle (12) is inclined diagonally downward along the flow direction. The side surface (12b) is disposed obliquely upward along the flow direction and reaches the outlet of the fuel-containing fluid supply nozzle (12).

This configuration, in the portion near the side surface (12a) of the fuel-containing fluid supply nozzle (12) forms a diagonally downward direction of the fuel-containing fluid ejection flow (20a) as shown in FIG. 9 (d), the side surface (12b) part forms an oblique upper direction of the fuel-containing fluid ejection flow (20d) as shown in FIG. 9 (c) close to. A fuel-containing fluid having a jet direction in the middle between the fuel-containing fluid jet flow (20a) and the center line from the two central flow paths in which the fuel-containing fluid supply nozzle (12) is partitioned by the fuel-containing fluid guide plate (19). An ejection flow (20b), a fuel-containing fluid ejection flow (20d), and a fuel-containing fluid ejection flow (20c) having an ejection direction in the middle of the center line are formed.

According to a thirteenth aspect of the present invention, the jet direction of the combustion air outside the one or more combustion air supply nozzles (15) arranged on the outer peripheral portion of the nozzle (12) is extended outward with respect to the fuel jet direction. a burner according to any one of claims 1,4～12 provided at the tip of the combustion air supply nozzle air guide plate (15a) combustion (1 5).

Claims (20)

The fluid (11) from the connection (10a) of the fluid transfer channel (10) for transferring the solid fuel and the fuel-containing fluid (11) of the fuel transfer medium toward the outlet provided on the wall of the furnace (4). In a burner having a fuel-containing fluid supply nozzle (12) for supplying a gas) and an air supply nozzle (15) for supplying one or more combustion air to the outer periphery of the fuel-containing fluid supply nozzle (12).
The fuel-containing fluid supply nozzle (12) has a cross section perpendicular to the flow of the fluid (11) from the connecting portion (10a) of the fluid transport channel (10) toward the outlet provided on the wall surface of the furnace (4). A rectangular shape, an elliptical shape or a substantially elliptical shape having a long diameter portion and a short diameter portion, and a cross section perpendicular to the flow of the fluid (11) from the connection portion (10a) of the fluid conveyance channel (10) toward the outlet portion. A burner characterized in that the size of the long diameter portion of the burner is gradually enlarged along the flow direction of the fluid (11).   In the fuel-containing fluid supply nozzle (12), the size of the long diameter portion of the cross section perpendicular to the flow of the fluid (11) from the connection portion (10a) of the fluid conveyance channel (10) to the outlet portion is a fluid ( 11. The burner according to claim 1, wherein the burner has a configuration in which the size gradually increases along the flow direction of 11) and the size of the short diameter portion is unchanged.   In the fuel-containing fluid supply nozzle (12), the size of the long diameter portion of the cross section perpendicular to the flow of the fluid (11) from the connection portion (10a) of the fluid conveyance channel (10) to the outlet portion is a fluid ( 11. The burner according to claim 1, wherein the burner has a configuration that gradually expands along the flow direction of 11) and that the size of the short diameter portion gradually decreases along the flow direction of the fluid.   The said fuel-containing fluid supply nozzle (12) has a fuel-containing fluid guide plate (19) which divides | segments the flow of a fuel-containing fluid (11) into plurality in the inside. Burner as described in.   The fuel-containing fluid guide plate (19) passes through a line in which the central axis in the flow direction of the fluid (11) in the fuel-containing fluid supply nozzle (12) extends into the furnace (4), and the nozzle (12) The burner according to claim 4, wherein the burner is arranged at a plurality of different inclination angles with respect to a plane parallel to the shortest diameter of the short diameter portion.   The fuel-containing fluid supply nozzle (12) has a fuel-containing fluid direction changing guide plate (21) for forcibly changing the flow direction of the fuel-containing fluid (11) inside the outlet thereof. The burner in any one of 1-5.   The guide plate (21) for changing the direction of fuel-containing fluid passes through a line extending the central axis of the fuel-containing fluid supply nozzle (12) into the furnace (4), and has the longest diameter of the long diameter portion of the nozzle (12). The burner according to claim 6, wherein the burner is arranged in a plurality of different directions with respect to a parallel plane.   The guide plate (21) for changing the direction of fuel-containing fluid passes through a line extending the central axis of the fuel-containing fluid supply nozzle (12) into the furnace (4) for a part of the fuel-containing fluid (11). The nozzle (12) is arranged in parallel to a plane parallel to the longest diameter of the long diameter portion of the nozzle (12). For the other fuel-containing fluid (11), the central axis of the fuel-containing fluid supply nozzle (12) is placed in the furnace (4). The burner according to claim 6, characterized in that the burner is arranged with an inclination angle with respect to a plane passing through the extended line and parallel to the longest diameter of the long diameter portion of the nozzle (12).   The fuel-containing fluid supply nozzle (12) is partitioned into a plurality of flow paths by the fuel-containing fluid guide plate (19), and the central axis of each flow path is the central axis of the fuel-containing fluid supply nozzle (12). Is provided on the wall surface of the furnace (4) at different inclination angles with respect to a plane parallel to the longest diameter of the long diameter part of the outlet of the nozzle (12). The burner according to claim 4.   The fuel-containing fluid dividing plate (22) capable of dividing the outlet portion into a plurality of portions is provided at the outlet portion of the fuel-containing fluid supply nozzle (12). Burner.   The burner according to any one of claims 1 to 10, wherein a flame holder (17) having an L-shaped cross section is provided at an outlet of the fuel-containing fluid supply nozzle (12).   The guide plate (17a) for changing the blowing direction of the combustion air around the flame holder (17) to the outside is provided at the tip of the L-shaped flame holder (17). The burner described.   At the tip of the fuel-containing fluid supply nozzle (12), the injection direction of the combustion air outside the one or more combustion air supply nozzles (15) disposed on the outer periphery of the nozzle (12) is the fuel injection direction. The burner according to any one of claims 1 to 12, further comprising a combustion air guide plate (15a) extending outward.   The fuel-containing fluid supply nozzle (12) is provided with a concentrator (23) that once narrows the flow path of the fuel-containing fluid (11) and then expands the flow path again. Burner in any one of -13.   The fluid distribution plate (24) for evenly distributing fuel in the nozzle (12) is provided at the inlet of the fuel-containing fluid supply nozzle (12). The burner described.   In the vicinity of the fluid (11) ejected from the fuel-containing fluid supply nozzle (12), nozzles (41, 44) for ejecting liquid fuel or gaseous fuel as auxiliary fuel are disposed in the vicinity of the fuel-containing fluid supply nozzle (12). The burner according to claim 1, wherein the burner is provided.   A wall surface region in which the burners according to claim 1 to 16 are arranged in a plurality of stages on two opposing furnace walls in the vertical direction, and the plurality of burners provided in each stage are divided into two at the center of the horizontal width of the same furnace wall. The combustion apparatus characterized by arrange | positioning each symmetrically.   The burners according to claim 1 to 16 are arranged in a plurality of stages on two opposing furnace walls, and the horizontal burners adjacent to each other among the plurality of burners provided on each stage of the same furnace wall have the same structure. Combustion apparatus characterized by being a burner. In a boiler having a furnace wall configured by spirally winding a water wall pipe (25) inclined in the horizontal direction,
A rectangular, elliptical or substantially elliptical opening (26) is provided in the furnace wall along the longitudinal direction of the water wall pipe (25), and the burner according to any one of claims 1 to 16 is provided in the opening. (26) The boiler characterized by attaching to. In a boiler with a furnace wall composed of a group of water wall pipes (25) extending in the vertical direction,
A rectangular, elliptical or substantially elliptical opening (26) is provided in the furnace wall along the longitudinal direction of the water wall pipe (25), and the burner according to any one of claims 1 to 16 is provided in the opening. (26) The boiler characterized by attaching to.

Images