JP2008304146A - Burner and boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner capable of miniaturizing a device, capable of reducing electric power consumption, and capable of realizing reduction in a toxic substance together with ignition stability when resuming combustion. <P>SOLUTION: This burner 100 has a fuel jetting part 101 mixing and jetting a plurality of fluids O1 and W1, and an air jetting part 147 jetting combustion air, and is characterized by being constituted so that the fuel jetting part 101 has an adding fluid introducing part 140 and a fuel introducing part 130, and the adding fluid W1 introduced via the adding fluid introducing part 140 is pulled in by introducing pressure of the fuel O1 introduced by the fuel introducing part 130. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a burner and a boiler.

  Conventionally, reduction of nitrogen oxide (NOx) in combustion gas (exhaust gas) discharged from a combustion apparatus such as a boiler or a gas turbine has been required for environmental protection. Therefore, in Japan, various NOx reduction technologies are being developed.

  As one of the above-described NOx reduction technologies, for example, a combustion method using emulsion fuel is known. In this method, water is added to liquid fuel to form an emulsion fuel, and this emulsion fuel is combusted. According to this method, NOx and soot in the combustion exhaust gas can be reduced.

  In general, when an emulsion fuel is configured, a mixing device for mixing liquid fuel and water is required (see, for example, Patent Document 1). That is, when a combustion apparatus using a burner or the like using emulsion fuel is configured, a mixing apparatus equipped with a screw, a stirring blade, or the like is usually provided upstream of the burner (the fuel ejection part constituting the burner). ing.

  However, according to the above prior art, since a mixing device is required, there is a problem that the entire device becomes large and power consumption increases.

  Further, according to the above prior art, since the mixing device for mixing the liquid fuel and water is provided at a position away from the fuel ejection portion, the pipe between the mixing device and the fuel ejection portion when the combustion is stopped The liquid fuel and the water are separated from each other, causing various problems. For example, there has been a problem that ignition is unstable because a large amount of water separated at the time of re-ignition after combustion is stopped is ejected.

JP-A-5-157221

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and is capable of reducing the size of the apparatus, reducing the power consumption, and stabilizing the ignition when resuming combustion, as well as harmful substances (NOx, dust, etc.). It is an object of the present invention to provide a burner (a burner using emulsion fuel) that can realize reduction of the above. Further, the present invention was made to solve the above-described problems of the prior art, and by using the above-described burner, along with downsizing of the apparatus, reduction of power consumption, and ignition stability at the time of resuming combustion, It is an object to provide a boiler capable of reducing harmful substances (NOx, dust, etc.).

  The present invention has been made in order to solve the above-described problem, and is a burner including a fuel ejection portion that mixes and ejects a plurality of fluids, and an air ejection portion that ejects combustion air, The fuel ejection part has an additive fluid introduction part and a fuel introduction part, and the additive fluid introduced through the additive fluid introduction part is drawn by the introduction pressure of the fuel introduced at the fuel introduction part. It is characterized by being configured.

  According to such a configuration, since the fuel ejection portion can mix and eject a plurality of fluids, a mixing device as in the prior art is not required. Further, since the added fluid is introduced into the fuel ejection portion by the introduction pressure of the fuel, the pump pressure for supplying the added fluid can be reduced. Therefore, according to such a configuration, it is possible to reduce the size of the apparatus and reduce power consumption.

  Furthermore, according to such a configuration, as described above, the mixing device is not required, and the fluid is mixed in the fuel ejection portion. Therefore, even when the combustion is stopped, the liquid fuel and the addition are added in the pipe. There is no separation from the fluid. Therefore, according to such a structure, the ignition stability at the time of resuming combustion increases.

  Moreover, according to such a structure, since an appropriate combustion state can be realized using emulsion fuel, it is possible to reduce harmful substances (NOx, dust, etc.).

  As described above, according to such a configuration, a burner capable of reducing the size of the apparatus, reducing power consumption, and stabilizing ignition at the time of resuming combustion, as well as reducing harmful substances (NOx, dust, etc.) is obtained. be able to.

  The present invention has been made in order to solve the above-described problem, and is a burner including a fuel ejection portion that mixes and ejects a plurality of fluids, and an air ejection portion that ejects combustion air, The fuel ejection part has an additive fluid introduction part, a fuel introduction part, and an air introduction part, and the additive fluid introduced through the additive fluid introduction part by the introduction pressure of the fuel introduced at the fuel introduction part Is configured to be drawn.

  According to such a configuration, since the fuel ejection portion can mix and eject a plurality of fluids, a mixing device as in the prior art is not required. Further, since the added fluid is introduced into the fuel ejection portion by the introduction pressure of the fuel, the pump pressure for supplying the added fluid can be reduced. Therefore, according to such a configuration, it is possible to reduce the size of the apparatus and reduce power consumption.

  In addition, according to such a configuration, as described above, the mixing device is not required, and the fluid is mixed in the fuel ejection portion. Therefore, even when the combustion is stopped, the liquid fuel and water are mixed in the pipe. There is no separation. Therefore, according to such a structure, the ignition stability at the time of resuming combustion increases.

  Furthermore, according to such a configuration, an appropriate combustion state can be realized using the emulsion fuel, so that harmful substances (NOx, dust, etc.) can be reduced.

  In addition, according to such a configuration, the fuel ejection portion is configured to mix and eject three fluids (added fluid, fuel, air), and at this time, the added fluid at the introduction pressure of the fuel Are introduced and mixed in the fuel ejection portion. That is, after the additive fluid is added to the fuel, a mixing process with the air is performed. With such a configuration, the additive fluid is present near the fuel, and the flame can be effectively cooled. Therefore, the effect of reducing NOx can be enhanced. If the additive fluid is added to the air side, the NOx reduction effect is weak and the addition amount of the additive fluid needs to be increased (in order to increase the NOx reduction effect), so that the boiler efficiency is also reduced. . That is, according to such a configuration, when mixing the three fluids, the additive fluid is present in the vicinity of the fuel, so that the flame cooling effect is enhanced by using a small amount of the additive fluid to reduce NOx. In addition, a reduction in boiler efficiency can be prevented.

  Furthermore, according to such a configuration, since the air is mixed in addition to the fuel and the added fluid, the fuel and the like are atomized by the air. Therefore, according to such a structure, compared with the case where the said air is not mixed, effective NOx reduction can be implement | achieved by the said less added fluid. Furthermore, since the atomization of the fuel and the like is performed as described above, low dust and low CO can be realized.

  As described above, according to such a configuration, a burner capable of reducing the size of the apparatus, reducing power consumption, and stabilizing ignition at the time of resuming combustion, as well as reducing harmful substances (NOx, dust, etc.) is obtained. be able to.

  In the burner according to the present invention, it is preferable that a fluid containing at least one of water, ethanol, and bioethanol is used as the additional fluid.

  Further, in the burner according to the present invention, the fuel in the fuel ejection portion corresponds to either the fuel ejection location in the fuel ejection portion or the combustion air ejection location in the air ejection portion. A configuration in which any one of the ejection location and the ejection location of the combustion air in the air ejection section is provided is preferable.

According to this preferable configuration, in addition to the various effects described above by mixing the added fluid and the air, the following effects can be obtained.
That is, according to this preferable configuration, since the fuel (emulsion fuel) and the combustion air are jetted in association with each other, the mixing state of the fuel and the combustion air becomes good, and low dust in the burner And low CO. In addition, since the mixed state of the fuel and the combustion air becomes good, when liquid fuel is used as the fuel, the flame approaches the vaporized combustion state, so that NOx reduction can be achieved. Furthermore, since the mixing state of the fuel and the combustion air becomes good, the burner can be efficiently burned, so that the combustion chamber can be downsized and the can body downsized. Can be planned.

  Moreover, in the burner concerning this invention, it is preferable that the said fuel is ejected according to the position where the flow velocity of the said combustion air ejected from the said air ejection part is quick.

According to this preferable configuration, in addition to the various effects described above by mixing the added fluid and the air, the following effects can be obtained.
That is, according to this preferable configuration, it is possible to improve the mixing state of the fuel and the combustion air, and as described above, low dust, low NOx, and miniaturization of the can body. Can be achieved.

  Further, in the burner according to the present invention, a plurality of the air ejection portions are provided, and a plurality of the fuel ejection portions are provided corresponding to the air ejection portions (described later, “fuel ejection” Also preferred is a configuration including a plurality of ejection holes.

According to this preferable configuration, in addition to the various effects described above by mixing the added fluid and the air, the following effects can be obtained.
That is, according to this preferable configuration, the plurality of air ejection portions (combustion air) and the fuel ejection portions (the fuel (emulsion fuel)) are configured to correspond one-to-one to form a divided flame. The Rukoto. Therefore, according to such a configuration, in addition to the above-described effects, it is possible to achieve low NOx by using a divided flame.

  Further, in the burner according to the present invention, a plurality of the air ejection portions are provided, and a plurality of ejection holes for ejecting the fuel are provided in the fuel ejection portion corresponding to the air ejection portions. A configuration is preferred.

According to this preferable configuration, in addition to the various effects described above by mixing the added fluid and the air, the following effects can be obtained.
That is, according to this preferable configuration, the plurality of air ejection portions (the fuel air) and the ejection holes (the fuel (emulsion fuel)) are configured in a one-to-one correspondence, and the divided flame is similar to the above. Will be formed. Therefore, according to such a configuration, in addition to the above-described effects, it is possible to achieve low NOx by using a divided flame.

  Furthermore, in the burner according to the present invention, it is preferable that each of the air ejection portions includes a guide portion that controls the air ejection direction and a diffusion portion that diffuses the ejected air.

According to this preferable configuration, in addition to the various effects described above by mixing the added fluid and the air, the following effects can be obtained.
That is, according to this preferable configuration, since the air ejection portion has the guide portion, the flow of the flame (gas) is controlled according to the configuration of the can body (position of the gas flow path, etc.) to reduce harmful substances. (Low dust and low NOx) can be achieved. Further, since the air ejection part has the diffusion part, the fuel and the combustion air can be effectively mixed to reduce dust. According to such a configuration (a configuration having a diffusion portion), the mixing state of the fuel and air ejected from the fuel ejection portion can be made partially non-uniform. In other words, it does not simply improve the mixing state, but partially forms a non-uniform mixing state intentionally by the diffusing section. Therefore, a boiler configured using such a burner reduces the gas temperature in the can. , NOx value can be reduced. Further, according to such a configuration, by having the guide portion, the combustion air can be focused and brought into contact with the fuel at a high speed, so that the flame combustion state approaches vaporization combustion. , NOx reduction can be achieved. Further, by increasing the flow rate of the air jetted by providing the guide portion, the gas around the guide portion is entrained (because it is in a state of self-recirculation), so it is possible to reduce NOx. it can.

  In addition, the present invention has been made to solve the above-described problem, and has a can body having an inner water tube group and an outer water tube group arranged in an annular shape, and is disposed at a central portion of the inner water tube group. A boiler provided with a burner, wherein the burner is a burner having any one of the above-described configurations.

  According to the boiler according to such a configuration, since the burner capable of exhibiting the various effects described above is mounted, it is possible to obtain a boiler that can effectively realize reduction of harmful substances and the like.

  ADVANTAGE OF THE INVENTION According to this invention, the burner which can implement | achieve reduction of a hazardous | toxic substance (NOx, dust, etc.) with the downsizing of an apparatus, reduction of power consumption, and the ignition stability at the time of resuming combustion can be obtained. Further, according to the present invention, by using the above-described burner, it is possible to realize reduction of harmful substances (NOx, dust, etc.) as well as downsizing of the apparatus, reduction of power consumption, and ignition stability at the time of resuming combustion. You can get a boiler.

  Before describing the embodiments of the present invention, terms used in this specification will be described.

  In the present specification, when simply referred to as “gas”, the gas is a concept including at least one of a gas during a combustion reaction and a gas for which the combustion reaction has been completed, and may also be referred to as a combustion gas. In other words, the gas includes both the gas in the combustion reaction and the gas in which the combustion reaction is completed, the gas in the combustion reaction only, or the gas in which the combustion reaction is completed only. It is a concept that includes. Hereinafter, the same concept is used unless otherwise described.

  Further, the exhaust gas means a gas in which the combustion reaction is completed or almost completed. Further, unless otherwise specified, exhaust gas means either or both of the gas that passes through the boiler body and reaches the chimney and the gas that circulates in the body.

  Further, the gas temperature means the temperature of the gas during the combustion reaction unless otherwise specified, and is synonymous with the combustion temperature or the combustion flame temperature. Further, the suppression of the gas temperature means that the maximum value of the gas (combustion flame) temperature is kept low. In general, the combustion reaction is extremely small in the above-mentioned “gas for which the combustion reaction has been completed”, but continues, so “completion of the combustion reaction” means 100% completion of the combustion reaction. It is not a thing.

  Hereinafter, embodiments of the present invention will be described.

  First, a burner according to a first aspect of the present embodiment is a burner including a fuel ejection portion that mixes and ejects a plurality of fluids, and an air ejection portion that ejects combustion air, and the fuel ejection portion Has an additive fluid introduction part and a fuel introduction part, and is configured such that the additive fluid introduced through the additive fluid introduction part is drawn by the introduction pressure of the fuel introduced at the fuel introduction part. It is characterized by having.

  Moreover, the burner according to the second aspect of the present embodiment is a burner including a fuel ejection portion that mixes and ejects a plurality of fluids, and an air ejection portion that ejects combustion air, and the fuel ejection portion Has an additive fluid introduction part, a fuel introduction part, and an air introduction part, and the introduction fluid introduced through the additive fluid introduction part is drawn by the introduction pressure of the fuel introduced by the fuel introduction part. It is configured as described above.

  Furthermore, the burner according to the third aspect of the present embodiment is characterized in that, in the configuration of the first aspect or the second aspect, a fluid containing at least one of water, ethanol and bioethanol is used as the additive fluid. It is said.

  Further, the burner according to the fourth aspect of the present embodiment is the structure according to any one of the first aspect to the third aspect, wherein the fuel ejection part in the fuel ejection part and the combustion air ejection in the air ejection part Corresponding to any one of the locations, either the fuel ejection location in the fuel ejection portion or the combustion air ejection location in the air ejection portion is provided.

  Further, in the burner according to the fifth aspect of the present embodiment, in the configuration of the fourth aspect, the fuel is ejected in accordance with a position where the flow speed of the combustion air ejected from the air ejection portion is fast. It is a feature.

  Further, the burner according to the sixth aspect of the present embodiment is the configuration of the fourth aspect or the fifth aspect, wherein a plurality of the air ejection parts are provided, and the fuel ejection part corresponds to the air ejection part. It is characterized in that a plurality of are provided.

  Furthermore, the burner according to the seventh aspect of the present embodiment is the configuration of the fourth aspect or the fifth aspect, wherein a plurality of the air ejection parts are provided, and the fuel ejection part corresponds to the air ejection part. Is provided with a plurality of ejection holes through which the fuel is ejected.

  Further, in the burner according to the eighth aspect of the present embodiment, in the configuration of the sixth aspect or the seventh aspect, each of the air ejection portions diffuses the air to be ejected and a guide portion that controls the air ejection direction. And a diffusing portion to be used.

  Furthermore, the boiler concerning the 9th aspect of this embodiment is a boiler provided with the can which has the inner side water tube group and outer side water tube group which were arranged cyclically | annularly, and the burner arrange | positioned in the center part of the inner side water tube group Then, this burner is a burner according to any one of the first aspect to the eighth aspect.

<First Example>
Hereinafter, the boiler concerning the 1st example of the present invention is explained based on a drawing.

  FIG. 1 shows an explanatory view of a longitudinal section of a boiler according to a first embodiment of the present invention. FIG. 2 shows a simplified explanatory view of a cross section taken along line II-II in FIG. FIG. 3 shows a simplified explanatory view of a cross section taken along line III-III in FIG. FIG. 4 shows a simplified explanatory view of a cross section taken along line IV-IV in FIG.

  As shown in FIG. 1 etc., the boiler 1 concerning a present Example is comprised using the can 10 which has the water pipe group arranged in cyclic | annular form, and the burner 100 arrange | positioned in the center part of these water pipe groups. A wind box 70 for supplying combustion air to the burner 100 is provided above the burner 100.

  The can body 10 is configured by standing a plurality of water pipe groups (an inner water pipe group 20 and an outer water pipe group 30) between the upper header 11 and the lower header 12. The respective water tube groups 20 and 30 are arranged in a substantially concentric ring shape, and an outer water tube group 30 is provided at a predetermined interval from the inner water tube group 20, and the inner water tube group 20, the outer water tube group 30, and the like. An annular gas flow path 80 is formed between the two.

  In the present embodiment, the inner water tube group 20 is configured using a plurality of inner water tubes 21 and first vertical fin portions 24. Each inner water pipe 21 is formed in an annular shape with a substantially uniform predetermined interval, and a first vertical fin connected between each inner water pipe 21 so as to eliminate a gap between adjacent inner water pipes 21. A portion 24 is provided. That is, in the present embodiment, the inner water tube group 20 is configured in an annular shape in close contact with the first vertical fin portion 24.

  Moreover, the lower end part 21a of each inner side water pipe 21 is a reduced diameter part, and in the inner side water pipe group 20 concerning a present Example, the space around this reduced diameter lower end part 21a is the inner side formed circularly. It will function as the gas flow path 25. That is, the inner gas channel 25 functions to guide the gas generated inside the inner water tube group 20 to the annular gas channel 80.

  In the present embodiment, the outer water tube group 30 is configured using a plurality of outer water tubes 31 and a second vertical fin portion 34. Each outer water pipe 31 is formed in an annular shape with a substantially uniform predetermined interval, and a second vertical fin connected to each other to eliminate a gap between adjacent outer water pipes 31. A portion 34 is provided. That is, in the present embodiment, the outer water pipe group 30 is configured in an annular shape in a close state using the second vertical fin portion 34.

  Further, as shown in FIG. 1, the second vertical fin portion 34 connected between the outer water pipes 31 is provided so as to have a predetermined space with the heat insulating material provided on the upper portion of the inner wall of the can body 10. In the outer water tube group 30 according to the present embodiment, a space formed above the second vertical fin portion 34 (a space formed between the second vertical fin portion 34 and the upper heat insulating material). However, it functions as the outer gas channel 35 formed in an annular shape. The outer gas channel 35 functions to guide the gas introduced into the annular gas channel 80 toward the exhaust cylinder 90. That is, the gas generated inside the inner water tube group 20 is collected in the exhaust pipe 90 via the inner gas flow path 25, the annular gas flow path 80, and the outer gas flow path 35, and the can is It is discharged outside the body 10.

  Each inner water pipe 21 constituting the inner water pipe group 20 is provided with a plurality of first stud fins 22 at a position above the lower end portion 21a (in the vicinity of the inner gas flow path 25). More specifically, a plurality of first stud fins 22 are provided from a substantially central portion of each inner water pipe 21 facing the annular gas flow path 80 to a lower position. The inner water pipe 21 located on the downstream side (downstream side of the gas flow) where the first stud fins 22 are provided has a plurality of flat plate-like first fins 23 (flat plate shape) on the annular gas flow path 80 side. Fins).

  Each outer water pipe 31 constituting the outer water pipe group 30 is provided with a plurality of second stud fins 32 in the vicinity of the inner gas flow path 25. More specifically, a plurality of second stud fins 32 are provided from a substantially central portion of each outer water pipe 31 facing the annular gas flow path 80 to a lower position. The outer water pipe 31 located on the downstream side (downstream side of the gas flow) where the second stud fins 32 are provided has a plurality of flat plate-like second fins 33 (flat plate shape) on the annular gas flow path 80 side. Fins).

  That is, in the present embodiment, the stud fins (first stud fins 22) are connected to the inner water pipe group 20 (the inner water pipe 21 constituting the inner water pipe group 20) and the outer water pipe group 30 (the outer water pipe 31 constituting the outer water pipe group 30) in the vicinity of the inner gas flow path 25. , Second stud fins 32) are provided, and flat fins (first fins 23, second fins 33) are provided downstream of these stud fins (downstream in the gas flow). In the present embodiment, the first fin 23 and the second fin 33 are provided to have an inclination angle of 80 ° (an inclination angle of 10 ° with respect to the horizontal) with respect to the gas flow (vertical flow). ing.

  5 and 6 are schematic views of a burner provided in the boiler according to the present embodiment. Here, FIG. 5 shows an explanatory view of a longitudinal section of the burner according to the present embodiment, and FIG. 6 shows a bottom view of the burner shown in FIG.

  The burner 100 constituting the boiler 1 according to the present embodiment is installed in a partition wall 71 in a wind box 70 as air supply means for supplying combustion air to the burner 100 (see FIGS. 1 and 5). . Specifically, the mounting plate 141 constituting the burner 100 is mounted on the partition wall 71 from above, and the mounting plate 141 is fastened to the partition wall 71 by fastening means (not shown) such as bolts, whereby the burner. 100 is installed in the partition wall 71 in the wind box 70. In the present embodiment, the configuration of the blower that supplies air into the wind box 70 is omitted because it is a well-known technique.

  As shown in FIG. 5 and FIG. 6, the burner 100 according to the present embodiment includes a fuel ejection part 101 that sprays mixed fuel (a fuel obtained by mixing a plurality of fluids, which will be described in detail later). In order to supply an igniter (not shown) provided in the vicinity of the fuel ejecting portion 101 and an air from the wind box 70 to the mixed fuel sprayed (injected) from the fuel ejecting portion 101. Provided air supply path (first air supply path 144 for primary air supply, second air supply path 145 for secondary air supply) and air supplied from the first air supply path 144 to the combustion chamber 16 side And a plurality of ambient air ejection portions 147 for ejecting the air supplied from the second air supply path 145 to the combustion chamber 16 side (corresponding to the “air ejection portion” of the present invention) One sky It is configured by using a jet portion 147a~ sixth ambient air ejection portion 147f) and.

  A nozzle tip 110 is provided at the tip of the fuel ejection portion 101 according to the present embodiment. The nozzle tip 110 is provided with a plurality (six in this embodiment) of ejection holes (first ejection hole 113A to sixth ejection hole 113F) for ejecting the mixed fuel. In the fuel ejection part 101 according to the present embodiment, the combustion load in the boiler is controlled by adjusting the pressure of the sprayed liquid fuel. That is, the supply pressure of the liquid fuel or the like sent to the fuel injection unit 101 is adjusted in accordance with the required amount of boiler fuel, and the mixed fuel composed of the liquid fuel and the like thus adjusted is divided into six fuels. It sprays in the combustion chamber 16 of the can 10 from the ejection holes 113A-113F.

  As described above, the burner 100 according to the present embodiment uses the fuel ejection part 101 (the fuel ejection part that ejects (sprays) a mixture of a plurality of fluids), the ambient air ejection part 147 (the air ejection part), and the like. The fuel ejection part 101 is introduced by the fuel introduction part 130 for introducing the liquid fuel O1, the added fluid introduction part 140 for introducing the added fluid W1, and the introduction parts 130 and 140. The mixing unit 120 that mixes the fluid and the nozzle tip 110 that sprays the mixed fuel that is configured in the mixing unit 120 are configured.

  The mixing unit 120 includes an ejector nozzle, and the added fluid W1 introduced via the added fluid introduction unit 140 is mixed by the mixing unit 120 due to the introduction pressure of the liquid fuel O1 introduced through the fuel introduction unit 130. Function to be drawn into. A supply pump (not shown) for supplying each fluid to the mixing unit 120 side is provided on the upstream side of the fuel introduction unit 130 and the added fluid introduction unit 140. In this embodiment, as described above, Since the mixing unit 120 has an ejector structure and the added fluid W1 is drawn by the liquid fuel O1, the supply pump power (supply pressure) provided on the added fluid W1 side can be reduced.

  In the present embodiment, it is preferable to use a fluid containing at least one of water, ethanol, and bioethanol as the additive fluid W1. Accordingly, the additive fluid W1 used here may be water alone or an aqueous solution of water and ethanol (or bioethanol).

  The first air supply path 144 constituting the burner 100 is configured using a first cylinder member 154 provided outside the fuel ejection portion 101, and the second air supply path 145 includes the first cylinder member 154. It is configured using. That is, the inner area of the first cylinder member 154 functions as the first air supply path 144, and the area formed between the first cylinder member 154 and the second cylinder member 155 functions as the second air supply path 145. . At the upper end portion of the second cylindrical member 155, an expanding portion 155A that is expanded outward as it goes upward is formed. The reason why the expanded portion 155 </ b> A having such a shape is provided is to allow the air supplied from the wind box 70 to flow uniformly in the cross-sectional direction in the second air supply path 145. If the expanded portion 155A is not provided, the air flow adheres to the inner wall of the second cylinder member 155 and flows, and does not flow uniformly in the cross-sectional direction in the second air supply path 145.

  A first air supply plate 156 in which a central air ejection portion 146 is perforated is provided at the distal end portion (the end portion on the combustion chamber 16 side of the boiler 1) of the first cylindrical member 154, and is supplied from the wind box 70. Air is ejected to the combustion chamber 16 side through the central air ejection portion 146. In addition, a second air supply plate 157 provided with a plurality of ambient air ejection portions 147 is provided at the distal end portion (end portion on the combustion chamber 16 side of the boiler 1) of the second cylindrical member 155, and the wind box 70 is provided. The air supplied from is not only ejected from the central air ejection part 146 but also through the plurality of ambient air ejection parts 147 to the combustion chamber 16 side.

  The ambient air ejection part 147 (corresponding to the “air ejection part” of the present invention) is provided around the fuel ejection part 101 (corresponding to the “fuel ejection part” of the present invention) as shown in FIGS. ing. Six ambient air ejection portions 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f) are provided around the fuel ejection portion 101, and are provided on the nozzle tip 110 of the fuel ejection portion 101. The mixed fuels Fa to Ff ejected from the respective ejection holes (first ejection hole 113A to sixth ejection hole 113F) are each ambient air ejection section 147 (first ambient air ejection section 147a to sixth ambient air ejection). It is configured to be located directly below the portion 147f) (see FIG. 6).

  That is, in the present embodiment, the mixed fuel in the fuel ejection portion 101 corresponds to the ejection location of the combustion air in the ambient air ejection portion 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f). The ejection location (the ejection holes (first ejection hole 113A to sixth ejection hole 113F) provided in the nozzle tip 110) is provided. More specifically, the mixed fuels Fa to Ff are matched to a position where the flow velocity of the combustion air ejected from the ambient air ejection part 147 (first ambient air ejection part 147a to sixth ambient air ejection part 147f) is high. It is configured to be ejected (see FIG. 6).

  Further, the ambient air ejection portion 147 is configured to eject air inward so that the gas generated in the burner 100 does not spread outward. According to such a configuration, the mixed fuel and the flame (gas) at the combustion start stage are less likely to come into contact with the inner water tube group 20 of the can 10. The generation of dust can be effectively prevented.

  The ambient air ejection portions 147 according to the present embodiment are arranged such that the air ejected from the respective ambient air ejection portions 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f) is inside (fuel ejection portion 101 side). The air jetted from the guide portions 158 (first guide portion 158a to sixth guide portion 158f) guided in the direction and the respective ambient air ejection portions 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f) Diffusion unit 159 (first diffusion unit 159a to sixth diffusion unit 159f) that promotes diffusion of

  More specifically, in the present embodiment, six substantially trapezoidal through-hole portions 151 (first through-hole portion 151a to sixth through-hole portion 151f) are drilled in the second air supply plate 157, A guide portion 158 (first guide portion 158a to sixth guide portion 158f) is configured using a plate-like member on the outer peripheral side (the side far from the fuel injection portion 101) of each through-hole portion 151. This guide portion 158 is configured to cover a part of each through-hole portion 151, and in this embodiment, a portion not covered by this guide portion 158 is ejected from the ambient air ejection portion 147. It functions as a diffusion part 159 (first diffusion part 159a to sixth diffusion part 159f) that promotes diffusion of air.

  Each guide portion 158 has at least a part of air ejected from each ambient air ejection portion 147 (mainly air in a region covered by the guide portion 158 of the through-hole portion 151) inside (fuel ejection portion 101 side). ) The plate-like member is inclined to be ejected in the direction. The inclination angle θ (attachment angle) at this time is preferably about 20 ° to 60 °.

  Further, each guide portion 158 is arranged so that the mixed fuels Fa to Ff sprayed from the respective ejection holes (first ejection hole 113A to sixth ejection hole 113F) of the nozzle tip 110 in the fuel ejection section 101 do not contact each other. The height of the guide part 158 is set.

  As described above, the diffusion portion 159 (the first diffusion portion 159a to the sixth diffusion portion 159f) is a portion of the through-hole portion 151 that is not covered with the guide portion 158 (enclosed by a broken line in FIGS. 5 and 6). Area). Since this part (diffusion part 159) is not provided with an element for rectifying the air supplied via the second air supply path 145 such as the guide part 158, it is ejected from the diffusion part 159. The air will expand rapidly.

  Therefore, in the burner 100 according to the present embodiment, the air ejected from the ambient air ejecting portion 147 is guided inward by the guide portion 158 and part of the air is promoted to diffuse by the diffusing portion 159. .

  The boiler 1 concerning a present Example is comprised as mentioned above, and acts as follows based on the structure. Hereinafter, the operation will be specifically described with reference to FIGS.

  When the burner 100 according to the present embodiment is operated in a low combustion state, first, a blower (not shown) is driven, and air is supplied to the first air supply path 144 and the second air supply path 145 via the wind box 70. Is supplied. Next, the mixed fuels Fa to Ff are sprayed from the respective ejection holes (first ejection hole 113A to sixth ejection hole 113F) of the nozzle tip 110 in the fuel ejection part 101 at a pressure corresponding to low combustion, and in accordance with the spray timing. Thus, the igniter (not shown) is energized.

  That is, in the present embodiment, air is ejected from the central air ejection portion 146 and the ambient air ejection portion 147 via the first air supply path 144 and the second air supply path 145, and this air and each ejection hole (first Mixing with the fuel mixture sprayed from the one ejection hole 113A to the sixth ejection hole 113F) is performed. Then, the mixed fuel mixed with the air is ignited by an igniter (not shown) provided near the fuel ejection portion 101 to form an electric spark when energized. By this ignition, the mixed fuels Fa to Ff sprayed from the fuel ejection part 101 are combusted, and as long as the mixed fuels Fa to Ff are continuously supplied at a pressure corresponding to low combustion, the burner 100 is maintained in a low combustion state. It will be. Further, if the mixed fuels Fa to Ff are supplied in a state where the pressure is increased to a pressure corresponding to high combustion, the burner 100 enters a high combustion state.

  In the burner 100 according to the present embodiment, the fuel supply state (fuel supply pressure) in the fuel ejection portion 101 can be appropriately controlled to be switched to any of the stopped state, the low combustion state, and the high combustion state. is there. That is, when the combustion state continues, switching from low combustion to high combustion or from high combustion to low combustion is possible.

  The amount of air supplied to the burner 100 is generally adjusted using a damper (not shown) provided in a duct between the wind box 70 and the blower, an inverter for controlling the rotational speed of the blower, or the like (not shown). The And this air is supplied corresponding to the supply amount of mixed fuel. For example, in a burner configured using two nozzle tips having similar fuel supply performance, the amount of air supplied when spraying mixed fuel from one of the nozzle tips (at the time of low combustion) is “1”. Then, when the mixed fuel is sprayed from both nozzle tips (at the time of high combustion), the amount of air supplied is “2”. Such air amount adjustment is performed using a damper or an inverter.

  Now, in the burner 100 configured and functioning as described above, as shown in FIG. 6 and the like, the combustion air in the ambient air ejection part 147 (first ambient air ejection part 147a to sixth ambient air ejection part 147f) Corresponding to the jetting locations, jetting locations of the mixed fuel in the fuel jetting portion 101 (jetting holes provided in the nozzle tip 110 (first jetting holes 113A to sixth jetting holes 113F)) are provided. That is, by causing the mixed fuels Fa to Ff to be ejected in accordance with a position where the flow velocity of the combustion air ejected from the ambient air ejecting portion 147 (the first ambient air ejecting portion 147a to the sixth ambient air ejecting portion 147f) is high. The combustion air and the mixed fuel are configured to increase the mixed state.

  Further, in the burner 100 according to the present embodiment, as shown in FIG. 5 and the like, a guide portion 158 is provided in order to inject air from the ambient air ejection portion 147 inward. Therefore, in the burner 100, the flame F (combustion gas) (illustration omitted) will be formed toward the downward direction in the state by which the breadth was suppressed. The combustion gas G0 generated by the burner 100 flows downward along the inner water tube group 20. The gas that has flowed downward along the inner water tube group 20 collides with the lower surface of the can body 10, and then becomes a flow of gas G1 (see FIGS. 1 and 2) that flows radially in the circumferential direction. It is introduced into the annular gas flow path 80 through the inner gas flow path 25.

  The gas G <b> 2 introduced into the annular gas channel 80 via the inner gas channel 25 then flows upward along the inner water tube group 20 and the outer water tube group 30. At this time, the gas G2 flows upward according to the inclination angle of the flat fins (first fin 23, second fin 33) provided in the inner water tube group 20 and the outer water tube group 30. Then, the gas G2 that has flowed upward collides with the upper surface of the can 10 and then becomes a flow of gas G3 (see FIGS. 1 and 4) that flows radially in the circumferential direction. The gas is collected in the exhaust cylinder 90 through 35 and discharged to the outside of the can body 10 through the exhaust cylinder 90.

  In the gas flow as described above, the thermal energy of the flame (combustion gas) generated by the burner 100 is recovered by the inner water tube group 20 and the outer water tube group 30.

  More specifically, first, the gas G0, G1 and the inner surface of the inner water tube group 20 are in contact with each other on the inner surface side of the inner water tube group 20 (the side where the burner 100 is provided (combustion chamber side)). The heat recovery is performed by Next, when the gas G1 passes through the inner gas flow path 25, the inner water pipe group 20 (the lower end portion 21a of the inner water pipe 21 constituting the gas pipe G1) and the gas G1 come into contact with each other to recover heat.

  Next, after the gas G1 passes through the inner gas passage 25, the gas collides with the lower end of the outer water tube group 30, and in addition, stud fins 22 and 32 are provided in the vicinity of the inner gas passage 25. Therefore, a turbulent state is promoted in the vicinity of the inner gas flow path 25. Therefore, in the vicinity of the inner gas flow path 25, the first stud fins 22 and the second stud fins 32 are effectively brought into contact with the gas, and highly efficient heat recovery is performed.

  Next, the gas G2 flowing upward in the annular gas channel 80 is supplied to the inner water tube group 20, the outer water tube group 30, and the flat fins (the first fin 23, the first fin provided in each of the water tube groups 20, 30). Heat recovery from the gas G2 is performed by making contact with the two fins 33) and making these contacts. Finally, the gas G3 that has flowed upward in the annular gas flow path 80 contacts the outside of the outer water tube group 30 (exhaust pipe 90 side) until it is collected in the exhaust pipe 90 via the outer gas flow path 35. By doing so, heat recovery is performed.

  Since the burner 100 and the boiler 1 according to this embodiment are configured and function as described above, the following effects can be obtained.

  According to the burner 100 according to the present embodiment, since the fuel ejection part 101 can eject a mixture of a plurality of fluids, a mixing device as in the prior art is not required. Further, since the added fluid W1 is introduced into the fuel ejection portion 101 (in the mixing portion 120 constituting the fluid) by the introduction pressure of the liquid fuel O1, the pump pressure for supplying the added fluid W1 can be reduced. That is, normally, the pump used to supply the liquid fuel O1 and the pump used to supply the added fluid W1 (for example, water) require the same pressure. According to the example, by using the mixing unit 120 having the ejector structure, the pump pressure for supplying the added fluid W1 can be made considerably smaller than the pump pressure for supplying the liquid fuel O1. For example, according to the present embodiment, the pump pressure for supplying the liquid fuel O1 is 1.5 MPa to 2.0 MPa, whereas the pump pressure for supplying the added fluid W1 is reduced to about 0 MPa to 1.0 MPa. Can do. Therefore, according to such a configuration, it is possible to reduce the size of the apparatus and reduce power consumption.

  Furthermore, according to the burner 100 according to the present embodiment, the mixing device 120 is not required and the fluid (the liquid fuel O1 and the added fluid W1) is mixed in the mixing unit 120 that constitutes the fuel injection unit. Even at times, the liquid fuel O1 and the added fluid W1 are not separated in the pipe. Therefore, according to such a structure, the ignition stability at the time of resuming combustion increases.

  In addition, according to the burner 100 according to the present embodiment, an appropriate combustion state can be realized using the emulsion fuel, so that harmful substances (NOx, dust, etc.) can be reduced.

  Furthermore, according to the burner 100 according to the present embodiment, the following effects can be obtained by the added fluid W1 used. For example, when “water” is used, the flame temperature can be lowered and NOx reduction can be realized. Further, even when “ethanol” is used, the calorific value is lower than that of general liquid fuel O1 (A heavy oil or the like), so that it is possible to achieve a low NOx by lowering the flame temperature. Further, when “ethanol aqueous solution” (for example, water 80% + ethanol 20%) is used, the flame temperature is lowered as compared with the case of using ethanol, and therefore, NOx reduction can be realized. In addition, when “bioethanol (or bioethanol aqueous solution)” is used, not only NOx but also CO can be reduced.

  For the various reasons described above, according to the burner 100 according to the present embodiment, it is possible to reduce the size of the device, reduce power consumption, and stabilize ignition at the time of resuming combustion, as well as reducing harmful substances (NOx, dust, etc.). You can get a burner. Further, by using this burner 100, it is possible to obtain a boiler capable of realizing downsizing of the apparatus, reduction of power consumption, ignition stability at the time of resuming combustion, and reduction of harmful substances (NOx, dust, etc.). .

  Further, the burner 100 according to the present embodiment includes a fuel ejection portion 101 that ejects mixed fuel, and an ambient air ejection portion 147 that ejects combustion air (corresponding to the “air ejection portion” of the present invention). Corresponding to either one of the mixed fuel injection location in the fuel injection portion 101 and the combustion air injection location in the ambient air ejection portion 147, the mixed fuel ejection location in the fuel ejection portion 101 and the ambient air ejection portion 147 Either one of the ejection locations of the combustion air is provided. In the present embodiment, the ejection holes (first ejection holes 113A) of the nozzle tip 110 in the fuel ejection section 101 corresponding to the ambient air ejection sections 147 (first ambient air ejection section 147a to sixth ambient air ejection section 147f). To sixth ejection holes 113F). That is, according to the position where the flow velocity of the combustion air ejected from the ambient air ejection part 147 (the first ambient air ejection part 147a to the sixth ambient air ejection part 147f) is high (the ambient air ejection part 147 (first ambient air) Just below the jetting part 147a to the sixth ambient air jetting part 147f)), the mixed fuels Fa to Ff are configured to be jetted.

  According to such a configuration, since the mixed fuel and the combustion air are jetted in association with each other, the mixed state of the mixed fuel and the combustion air becomes good, and the soot and the CO are reduced in the burner 100. be able to. In addition, since the mixed state of the mixed fuel and the combustion air becomes good, it approaches the vaporized combustion state, so that NOx can be reduced. Furthermore, since the mixed state of the mixed fuel and the combustion air becomes good, the burner 100 can be efficiently burned, and therefore the combustion chamber 16 and the can body 10 can be reduced in size. Can be achieved.

  Further, according to such a configuration, the plurality of ambient air ejection portions 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f) (fuel air) and the ejection holes (first ejection) of the nozzle tip 110 The holes 113A to the sixth ejection holes 113F) (mixed fuel) are configured in a one-to-one correspondence, and a divided flame is formed. Therefore, according to such a configuration, in addition to the above-described effects, it is possible to achieve low NOx by using a divided flame.

  Furthermore, in the burner 100 according to this embodiment, a plurality of combustion airs are ejected around the fuel ejection part 101 (nozzle tip 110) having a plurality of ejection holes (first ejection hole 113A to sixth ejection hole 113F). Ambient air ejection portions 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f) are provided, and each ambient air ejection portion 147 has a guide portion 158 for controlling the air ejection direction; And a diffusion portion 159 for diffusing the jetted air.

  According to such a configuration, since the ambient air ejection portion 147 has the guide portion 158, the flow of the flame (gas) is controlled according to the configuration of the can body (position of the gas flow path, etc.) to reduce harmful substances. (Low dust and low NOx) can be achieved. In the present embodiment, the inner gas flow path 25 of the can body 10 is formed in an annular shape below, and the gas flows uniformly to the inner gas flow path 25 and the gas to the inner water tube group 20 is In order to eliminate the early contact, the guide portion 158 is provided at an angle at which combustion air is ejected inward (fuel ejection portion 101 side). Based on such a configuration, if the combustion air is jetted inward, the mixed fuel and the flame (gas) at the combustion start stage are less likely to contact the inner water tube group 20 of the can body 10, so the vicinity of the burner 100 Inappropriate incomplete combustion can be eliminated, and generation of CO and soot can be effectively prevented.

  Further, according to such a configuration, by having the guide portion 158, it becomes possible to focus the combustion air and bring it into contact with the mixed fuel at a high speed, so that the combustion state of the flame approaches vaporization combustion, Low NOx can be achieved. Further, by increasing the flow velocity of the combustion air ejected by providing the guide portion 158 in this way, the gas around the guide portion 158 is entrained (because it is in a state of self-recirculation), so the NOx is reduced. Can be achieved.

  Furthermore, the ambient air ejection part 147 constituting the burner 100 according to the present embodiment also has a diffusion part 159 as well as the guide part 158 that exhibits the various effects described above. As described above, the diffusion portion 159 is a portion of the through-hole portion 151 that is not covered with the guide portion 158 (see FIGS. 5 and 6). That is, since the diffusion part 159 is not provided with an element for rectifying the air, such as the guide part 158, the air ejected from the diffusion part 159 flows into the edge part (through hole part) of the diffusion part 159. 151 edge portion). Then, in the immediate vicinity of the burner 100, a small turbulence occurs in the air, and the mixing state of the mixed fuel sprayed from the fuel ejection part 101 and the air can be partially made uneven. Since the burner 100 according to the present embodiment includes such a diffusion portion 159, the mixing state is not simply improved, and a partly intentionally non-uniform mixing state can be formed. That is, in the present embodiment, by providing the diffusion portion 159, it is possible to form a light and dark combustion state in the vicinity of the burner 100, so that the gas temperature can be lowered and the NOx value can be reduced. Of course, according to such a configuration, since the ambient air ejection part 147 has the diffusion part 159, the mixed fuel and the combustion air can be effectively mixed to reduce dust.

  As described above, the burner 100 configuring the boiler 1 according to the present embodiment has a configuration in which the mixed fuel is ejected in accordance with a position where the flow velocity of the combustion air ejected from the ambient air ejection portion 147 is fast. Therefore, since the combustion air and the mixed fuel are efficiently mixed, it is possible to reduce dust, reduce CO, and reduce NOx. Further, according to the boiler 1 according to the present embodiment, CO and dust are reduced by suppressing the spread of the gas in the combustion chamber 16 of the can 10, and the gas due to an appropriate exhaust gas circulation flow formed in the can 10. Due to the synergistic effect of the decrease in temperature, the decrease in gas temperature due to the formation of an appropriate split flame, and the decrease in gas temperature due to the concentration combustion formed by the diffusion part 159, the reduction of NOx, the reduction of CO, and the dust Reduction and the like can also be achieved.

  Furthermore, according to the present embodiment, the boiler 1 is configured as described above, and the gas flows in the can 10 as described above. Therefore, heat recovery is effectively performed and an extended transmission with high durability. A boiler having a water tube group having a hot surface (such as fins) can be obtained.

  Specifically, according to the boiler 1 according to the present embodiment, the stud fins 22 and 32 (enlarged heat transfer surfaces) are provided in the vicinity of the inner gas channel 25 (gas channel), which is a region where the temperature difference is large. Therefore, heat recovery can be performed effectively. In addition, since the enlarged heat transfer surfaces provided in the vicinity of the inner gas flow path 25 are the stud fins 22 and 32, even if an overheated state occurs, cracks, dropouts, and the like are unlikely to occur. Further, according to such a configuration, the stud fins 22 and 32 are provided in the vicinity of the inner gas flow path 25, and heat recovery is performed from the combustion gas at an early stage, and the temperature of the combustion gas is lowered early. Can be reduced.

  Further, in the boiler 1 according to the present embodiment, flat fins 23 and 33 inclined with respect to the gas flow are provided on the downstream side of the stud fins 22 and 32 provided in the vicinity of the inner gas flow path 25. It has been. According to such a configuration, it becomes possible to configure the boiler 1 that can be recovered more effectively and operated with high efficiency without wasting the heat energy that could not be recovered by the stud fins 22 and 32. .

  Furthermore, in the boiler 1 according to the present embodiment, the plate-like fins 23 and 33 provided on the downstream side of the stud fins 22 and 32 are provided so as to be inclined at a predetermined angle with respect to the gas flow. The inside of the annular gas flow path 80 is raised. That is, according to the present embodiment, compared to the case where fins are provided at right angles to the gas flow, the fins 23 and 33 do not obstruct the gas flow, so that the boiler 1 capable of realizing a low pressure loss can be obtained. .

  Moreover, according to the boiler 1 concerning a present Example, since it becomes possible to implement heat recovery effectively as mentioned above, it becomes possible to achieve size reduction of a boiler resulting from this. . That is, by increasing the heat recovery rate, it is possible to increase the operating efficiency of the boiler, and accordingly, the boiler can be reduced in size.

<Second Example>
Next, a boiler according to a second embodiment of the present invention will be described. The basic configuration of the boiler according to the second embodiment of the present invention is the same as that of the first embodiment described above, and only the configuration of the burner (particularly, the configuration of the fuel injection portion) is different. Therefore, in the following, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the detailed description thereof is omitted, and the configuration different from the first embodiment will be mainly described. .

  FIG. 7 shows a schematic view of a burner provided in a boiler according to a second embodiment of the present invention, and specifically shows an explanatory view of a longitudinal section of the burner according to the present embodiment. Yes. In addition, since the bottom view of the burner concerning a present Example is the same as that of FIG. 6 demonstrated in the 1st Example, it abbreviate | omits here (refer also to FIG. 6 as needed).

  The burner 200 constituting the boiler 1 according to this embodiment is installed in a partition wall 71 in a wind box 70 as an air supply means for supplying combustion air to the burner 200 (see FIGS. 1 and 7). . Specifically, the mounting plate 141 constituting the burner 200 is mounted on the partition wall 71 from above, and the mounting plate 141 is fastened to the partition wall 71 by fastening means (not shown) such as bolts. 200 is installed in the partition wall 71 in the wind box 70.

  As shown in FIG. 7 and the like, the burner 200 according to the present embodiment includes a fuel ejection portion 201 for spraying a mixed fuel (a fuel obtained by mixing a plurality of fluids, details will be described later), and this An igniter (not shown) provided in the vicinity of the fuel ejection part 201 so as to be positioned at the tip thereof, and provided to supply air from the wind box 70 to the mixed fuel sprayed (injected) from the fuel ejection part 201. Air supply path (first air supply path 144 for primary air supply, second air supply path 145 for secondary air supply) and air supplied from the first air supply path 144 is ejected to the combustion chamber 16 side. And a plurality of ambient air ejection portions 147 for ejecting the air supplied from the second air supply path 145 to the combustion chamber 16 side (corresponding to the “air ejection portion” of the present invention) (first circumference) Air outlet It is constructed by using the 47a~ sixth ambient air ejection section 147f).

  A nozzle tip 110 is provided at the tip of the fuel ejection part 201 according to the present embodiment. The nozzle tip 110 is provided with a plurality (six in this embodiment) of ejection holes (first ejection hole 113A to sixth ejection hole 113F) for ejecting the mixed fuel. In the fuel ejection part 201 according to the present embodiment, the combustion load in the boiler is controlled by adjusting the pressure of the sprayed liquid fuel. That is, the supply pressure of the liquid fuel or the like sent to the fuel ejection unit 201 is adjusted according to the required fuel amount of the boiler, and the mixed fuel composed of the liquid fuel and the like adjusted in this way has six mixed fuels. It sprays in the combustion chamber 16 of the can 10 from the ejection holes 113A-113F.

  As described above, the burner 200 according to the present embodiment uses the fuel ejection part 201 (the fuel ejection part that ejects (sprays) a plurality of fluids mixed), the ambient air ejection part 147 (the air ejection part), and the like. The fuel ejection part 201 includes a fuel introduction part 230 that introduces liquid fuel O2, an added fluid introduction part 240 that introduces an added fluid W2, an air introduction part 250 that introduces air A2, and these The mixing unit 220 that mixes the fluid (liquid fuel O2, the added fluid W2, and the air A2) introduced in the introduction units 230, 240, and 250, and the nozzle that sprays the mixed fuel formed by the mixing unit 220. The chip 110 is used.

  The mixing unit 220 includes an ejector nozzle, and the added fluid W2 introduced through the added fluid introduction unit 240 is mixed by the mixing unit 220 due to the introduction pressure of the liquid fuel O2 introduced through the fuel introduction unit 230. Function to be drawn into. On the upstream side of the fuel introduction unit 230 and the added fluid introduction unit 240, supply pumps (not shown) for supplying the respective fluids to the mixing unit 220 side are provided. In this embodiment, as described above, Since the mixing unit 220 has an ejector structure and the added fluid W2 is drawn by the liquid fuel O2, the supply pump power (supply pressure) provided on the added fluid W2 side can be reduced.

  Also in this embodiment, as in the first embodiment, it is preferable to use a fluid containing at least one of water, ethanol, and bioethanol as the added fluid W2. Accordingly, the additive fluid W2 used here may be water alone or an aqueous solution of water and ethanol (or bioethanol).

  Since the burner 200 and the boiler 1 according to the present embodiment are configured and function as described above, in addition to the effects obtained in the first embodiment, the following effects can be obtained.

  According to the burner 200 according to the present embodiment, the fuel ejection unit 201 can mix and eject a plurality of fluids (liquid fuel O2, additive fluid W2, and air A2). do not need. Further, since the added fluid W2 is introduced into the fuel ejection portion 201 (mixing portion 220 constituting the fuel jet portion 201) by the introduction pressure of the liquid fuel O2, the pump pressure for supplying the added fluid W2 can be reduced. Therefore, according to such a burner 200, it is possible to reduce the size of the apparatus and reduce power consumption.

  Further, according to such a burner 200, a mixing device is not required, and a plurality of fluids (liquid fuel O2, added fluid W2, and air A2) are supplied in the fuel ejection section 201 (mixing section 220 constituting the fuel ejection section 201). Since they are mixed, the liquid fuel O2 and the added fluid W2 are not separated in the pipe even when the combustion is stopped. Therefore, according to such a structure, the ignition stability at the time of resuming combustion increases.

  Furthermore, according to such a burner 200, since an appropriate combustion state can be realized using emulsion fuel, it is possible to reduce harmful substances (NOx, dust, etc.).

  Further, according to the burner 200 according to the present embodiment, the fuel ejection portion 201 is configured to mix and eject three fluids (added fluid W2, liquid fuel O2, and air A2). At this time, the liquid fuel O2 The added fluid W2 is introduced and mixed in the mixing part 220 of the fuel ejection part 201 at the introduction pressure of. That is, the mixing process with the air A2 is performed after the addition fluid W2 is added to the liquid fuel O2. With such a configuration, the additive fluid W2 exists near the liquid fuel O2, and the flame can be effectively cooled, so that the NOx reduction effect can be enhanced. If the additive fluid is added to the air side, the NOx reduction effect is weak, and it is necessary to increase the addition amount of the additive fluid (in order to increase the NOx reduction effect), so the boiler efficiency also decreases. That is, according to such a configuration, when the three fluids are mixed, by adding the added fluid W2 near the liquid fuel O2, the flame cooling effect is enhanced by using the small added fluid W2 to reduce NOx. In addition, a reduction in boiler efficiency can be prevented.

  Furthermore, according to such a burner 200, in addition to the liquid fuel O2 and the added fluid W2, the air A2 is also mixed, so the atomization of the liquid fuel O2 and the like is performed by the air A2. Therefore, according to such a structure, compared with the case where air A2 is not mixed, effective NOx reduction can be implement | achieved by the less addition fluid W2. Furthermore, since the atomization of the liquid fuel O2 and the like is performed in this way, low dust and low CO can be realized.

  For the various reasons described above, according to the burner 200 according to the present embodiment, it is possible to reduce the harmful substances (NOx, dust, etc.) as well as downsizing the apparatus, reducing power consumption, and stability of ignition when resuming combustion. You can get a burner. Further, by using this burner 200, it is possible to obtain a boiler capable of realizing downsizing of the apparatus, reduction of power consumption, ignition stability at the time of resuming combustion, and reduction of harmful substances (NOx, dust, etc.). .

<Other examples>
The present invention is not limited to the above-described embodiments and examples (hereinafter referred to as “the above-described embodiments and the like”), and various modifications are made as necessary within the scope that can meet the gist of the present invention. These are all included in the technical scope of the present invention.

  In the above-described embodiment and the like, the case where a plurality of ejection holes (first ejection hole 113A to sixth ejection hole 113F) are provided in the nozzle tip 110 provided at the tip of the fuel ejection section 101 has been described. The configuration is not limited to this, and any configuration may be used as long as the combustion air and the mixed fuel can be appropriately handled. Therefore, for example, a fuel ejection portion having a nozzle tip in which one ejection hole is formed corresponding to the plurality of ambient air ejection portions 147 (first ambient air ejection portion 147a to sixth ambient air ejection portion 147f). It may be provided. That is, it is good also as a structure which provides a some fuel ejection part by the number of the surrounding air ejection parts 147. FIG. In the case of such a configuration, it is preferable that one mixing portion is provided for each fuel ejection portion.

  Further, in the above-described embodiment and the like, the case where the guide portions 157 provided in the respective ambient air ejection portions 147 are provided in the same direction (inward direction) and inclined at the same angle has been described. Is not limited to this configuration. Therefore, for example, you may comprise so that the installation inclination angle of each guide part 157 may differ suitably.

  Furthermore, in the above-described embodiments and the like, the case where the guide portion 157 is configured using a plate-shaped member (scoop type) having a U-shaped cross section has been described, but the present invention is not limited to this configuration, Any configuration may be used as long as at least a part of the air ejected from the air ejection portion 147 can be guided inward. Therefore, you may comprise a guide part using the flat plate-shaped member of 1 sheet, for example. Specifically, a flat plate-like member may be provided on the outer peripheral portion of the through-hole portion 151 forming each ambient air ejection portion 147 so as to be inclined. Even with such a configuration, it is possible to guide at least a part of the air ejected from the ambient air ejection section 147 in the inward direction, so that the various effects described above can be obtained.

  Moreover, in the said embodiment etc., although the case where the guide part 157 was provided in all the surrounding air ejection parts 147 was demonstrated, this invention is not limited to this structure. It is an object of the present invention to control the flow of air (combustion air) so that the combustion air and the mixed fuel correspond to each other as appropriate, and the gas generated by the burner 100 does not spread outside more than necessary. Therefore, in addition to the configuration in which the guide portion is provided in all of the ambient air ejection portions, the concept includes a configuration in which the guide portion is provided in a part of the ambient air ejection portion.

  Furthermore, in the said embodiment etc., although the structure which provides the guide part 158 in each of several ambient air ejection part 147 (1st ambient air ejection part 147a-6th ambient air ejection part 147f) was demonstrated, this invention is It is not limited to this configuration. Therefore, for example, the ambient air ejection part may be configured to have only an opening (the through-hole part 51 in the present embodiment). Even in such a configuration, the combustion air and the mixed fuel can be appropriately handled (because it is possible to mix the combustion air and the mixed fuel in a one-to-one relationship). An effect can be obtained.

  Further, in the above-described embodiments and the like, the type of liquid fuel was not particularly described, but the present invention is not limited to any liquid fuel, and liquid fuels such as kerosene, A heavy oil, B heavy oil, C heavy oil, etc. Applicable.

  Furthermore, the boiler 1 concerning this invention is not limited to the structure of the can 10 demonstrated in FIG. 1 etc., A various change is possible as needed. Therefore, for example, a configuration as shown in FIG. Here, FIG. 8 shows a simplified explanatory view of a transverse section of a boiler according to another embodiment of the present invention.

  A boiler according to another embodiment has the same basic configuration as that of the first embodiment described above. Therefore, in the following, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the detailed description thereof is omitted, and the configuration different from the first embodiment will be mainly described. .

  FIG. 8 shows a simplified explanatory view of a cross section of a boiler according to another embodiment of the present invention. More specifically, it is a simplified explanatory diagram corresponding to FIG. 2 according to the first embodiment described above. That is, FIG. 8 shows a simplified explanatory view of a cross section in the vicinity of the inner gas flow path 25 (corresponding to the “gas flow path” of the present invention) of the boiler according to the present embodiment.

  As described above, the boiler 1 according to the present embodiment basically has the same configuration as that of the first embodiment, and the difference from the first embodiment is that the inner gas flow path 25 is in the vicinity. It is the number of stud fins provided. In the present embodiment, more second stud fins 32 are provided at the lower end of the outer water pipe 31 than in the first embodiment.

  As described in the first embodiment, after the gas G <b> 1 passes through the inner gas passage 25, the gas collides with the lower end portion of the outer water tube group 30. After that, in the vicinity of the inner gas flow path 25, the gas mainly flows upward along the outer water tube group 30. If so, it is possible to increase the number of contact with the gas by providing more stud fins (second stud fins 32) in the outer water tube group 30 in the vicinity of the inner gas flow path 25.

  A present Example is comprised paying attention to this gas flow, and aims at providing the boiler 1 which can perform heat recovery with higher efficiency.

  As described above, the boiler according to the present embodiment is provided with the stud fins 22 and 32 in the inner water tube group 20 and the outer water tube group 30 in the vicinity of the inner gas flow path 25, and more than the outer water tube group 30. Stud fins are provided.

  According to the boiler 1 according to the present embodiment, after the combustion gas generated in the burner 100 provided in the central portion of the inner water tube group 20 contacts the outer water tube group 30 via the inner gas passage 25, It circulates between water pipe groups (between the inner water pipe group 20 and the outer water pipe group 30) (annular gas flow path 80). At this time, the gas continuously flows from the inner water tube group 20 toward the outer water tube group 30, so in the annular gas flow path 80, the gas contact time is inevitably higher in the outer water tube group 30 than in the inner water tube group 20. Will be longer. According to the present embodiment, the outer water tube group 30 is provided with more stud fins than the inner water tube group 20, and therefore heat recovery from the combustion gas can be performed more effectively.

  Moreover, according to the boiler 1 concerning this other Example, in addition to the said effect, the effect obtained in a 1st Example can also be naturally obtained.

  Further, in the above-described embodiment and the like, the case where the stud fins 22 and 32 are provided in both the inner water tube group 20 and the outer water tube group 30 in the vicinity of the inner gas channel 25 (gas channel) has been described. It is not limited to the configuration. Therefore, for example, it is good also as a structure which provides a stud fin only in the outer side water pipe group 30 in the inner side gas flow path 25 vicinity. As described above, since the gas continuously flows from the inner water tube group 20 toward the outer water tube group 30, the gas contact time in the annular gas flow path 80 is longer than that of the inner water tube group 20. Will be longer. Therefore, even when the stud fin is provided only in the outer water tube group 30 in the vicinity of the inner gas flow path 25 in this way, heat recovery from the combustion gas can be performed relatively effectively.

  Further, in the above-described embodiment and the like, the case where a boiler is configured using a can body in which two rows of water tube groups are arranged substantially concentrically has been described. In addition, the can body may be configured by arranging three or more groups of water tubes. If a can body is configured by arranging three rows of water tube groups (for example, an inner water tube group, an intermediate water tube group, and an outer water tube group) in a substantially concentric circle, one end side (for example, the lower end side) of the inner water tube group If the inner gas flow path is provided in the intermediate water pipe group, the intermediate gas flow path is provided on the other end side (for example, the upper end side), and the outer gas flow is provided on one end side (for example, the lower end side) of the outer water pipe group. It is preferable to do.

  Furthermore, in the above-described embodiments and the like, the case of using the cylindrical stud fins 22 and 32 has been described. However, the present invention is not limited to this configuration, and a highly durable protrusion that can be appropriately welded to the water pipe. Any shape may be used as long as it is a thing. Therefore, for example, an oblique cylinder shape, an elliptic cylinder shape (including an oblique elliptic cylinder shape), a prismatic shape (including an oblique prism shape), a cone shape (including an oblique cone shape), a pyramid shape (including an oblique pyramid shape), etc. Stud fins having the following shape may be used.

It is explanatory drawing of the longitudinal cross-section of the boiler concerning the 1st Example of this invention. FIG. 2 is a simplified explanatory diagram of a cross section taken along line II-II in FIG. 1. FIG. 3 is a simplified explanatory diagram of a cross section taken along line III-III in FIG. 1. FIG. 4 is a simplified explanatory diagram of a cross section taken along line IV-IV in FIG. 1. The explanatory drawing of the longitudinal section of the burner concerning the 1st example of the present invention is shown. FIG. 6 is a bottom view of the burner shown in FIG. 5. The explanatory view of the longitudinal section of the burner concerning the 2nd example of the present invention is shown. It is a simplified explanatory drawing of the cross section of the boiler concerning the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Boiler 10 ... Can body 11 ... Upper header 12 ... Lower header 16 ... Combustion chamber 20 ... Inner water pipe group 21 ... Inner water pipe 21a ... Lower end part 22 ... First stud fin 23 ... First fin (flat fin)
24 ... first vertical fin part 25 ... inner gas flow path 30 ... outer water pipe group 31 ... outer water pipe 32 ... second stud fin 33 ... second fin (flat fin)
34 ... Second vertical fin part 35 ... Outer gas flow path 70 ... Wind box 71 ... Partition wall 80 ... Annular gas flow path 90 ... Exhaust tube 100 ... Burner 101 ... Fuel injection part 110 ... Nozzle tips 113A to 113F ... First injection hole ˜Sixth injection hole 120... Mixing part 130. Fuel introduction part 140... Addition fluid introduction part 141 .. Mounting plate 144 .. First air supply path 145 ... Second air supply path 146 ... Central air ejection part 147 ... Ambient air ejection Part 147a-147f ... 1st surrounding air ejection part-6th ambient air ejection part 151 ... Through-hole part 151a-151f ... 1st through-hole part-6th through-hole part 154 ... 1st cylinder member 155 ... 2nd cylinder member 155A ... Expanded portion 156 ... First air supply plate 157 ... Second air supply plate 158 ... Guide portions 158a to 158f ... First guide portion to sixth guide portion 159 ... Diffusion portion 1 9a~159f ... first diffusion part to sixth diffusion part

Claims (8)

A burner comprising a fuel jet part that mixes and jets a plurality of fluids, and an air jet part that jets combustion air,
The fuel ejection part has an additive fluid introduction part and a fuel introduction part, and the additive fluid introduced via the additive fluid introduction part is drawn by the introduction pressure of the fuel introduced by the fuel introduction part. It is comprised so that the burner characterized by the above-mentioned. A burner comprising a fuel jet part that mixes and jets a plurality of fluids, and an air jet part that jets combustion air,
The fuel ejection part has an additive fluid introduction part, a fuel introduction part, and an air introduction part, and the addition introduced through the additive fluid introduction part by the introduction pressure of the fuel introduced at the fuel introduction part A burner configured to draw fluid.   The burner according to claim 1 or 2, wherein a fluid containing at least one of water, ethanol and bioethanol is used as the additive fluid. Corresponding to any one of the fuel ejection location in the fuel ejection portion and the combustion air ejection location in the air ejection portion, the fuel ejection location in the fuel ejection portion and the combustion in the air ejection portion The burner according to any one of claims 1 to 3, wherein either one of the jetting locations of the working air is provided. The burner according to claim 4, wherein the fuel is ejected in accordance with a position where the flow speed of the combustion air ejected from the air ejection section is fast. A plurality of the air ejection portions are provided,
The burner according to claim 4 or 5, wherein a plurality of the fuel ejection portions are provided corresponding to the air ejection portions. The burner according to claim 6, wherein each of the air ejection portions includes a guide portion that controls an air ejection direction and a diffusion portion that diffuses the ejected air. A boiler comprising a can having an inner water tube group and an outer water tube group arranged in an annular shape, and a burner disposed in the center of the inner water tube group,
The boiler according to any one of claims 1 to 7, wherein the burner is the burner according to any one of claims 1 to 7.

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