TWI665408B - Burning device - Google Patents

Abstract

An object of the present invention is to prevent ash and the like floating in the furnace from adhering to the upper and lower openings that eject the rear air into the furnace. The boiler (10A) of the present invention includes a furnace (11), a torch for burning fuel with air having a theoretically required amount of air, and a burner for burning the fuel in an unburned state after burning through the torch. (11) A rear air supply unit and a rear air supply unit that supply rear air are provided with a first nozzle (32) that ejects rear air that goes straight toward the inside of the furnace (11), and a rear nozzle that faces the furnace (11). The rear air sprayed from the inside is deflected in a horizontal direction from the first nozzle (32) toward the left and right sides, and the second nozzle is gradually enlarged in diameter toward the inside of the furnace (11) and the front wall of the furnace wall (15). (15f) or a continuously enlarged diameter surface (16) of the rear wall (15r), and a part of the rear air ejected from the inside of the casing (31) toward the furnace (11) flows along the enlarged diameter surface (16) Guide member (40A).

Description

Burning device

The present invention relates to a combustion device such as a boiler that burns fuel such as carbon in two stages.

The furnace of a boiler that burns fuels such as fossil carbon includes a first-stage combustion zone and a second-stage combustion zone provided downstream of the first-stage combustion zone, and the second-stage combustion burns fuel in two stages. formula. The first stage of the combustion zone is to put fuel into the furnace: the fuel and air with a smaller amount of air than the theoretically necessary air required to burn the fuel will burn the fuel. In the first stage combustion region, the fuel is burned with air having a smaller amount of air than the theoretically necessary amount of air. In the combustion exhaust gas in the first combustion gas, unburned fuel (unburned fraction) remains. In the second stage combustion region, the remaining unburned fuel is burned to supply necessary air (rear air) from the rear air port, and the unburned fuel remaining in the combustion exhaust gas is burned.

In such a two-stage combustion type stove, the rear air vents arranged in the stove allow the unburned fuel to slip between the plural rear air vents and cause unburned fuel at the outlet of the stove. The residual amount of points increases.

For example, Patent Document 1 discloses a primary rear air nozzle provided at a center portion of an opening portion of a rear air vent, and a secondary rear air provided at a rear air port opening portion outside the primary rear air nozzle. The composition of the nozzle. In this configuration, an outlet portion of the secondary rear air nozzle is provided with a secondary rear air guide fin, and the secondary rear air can be supplied to the left and right in a horizontal direction. According to this structure, the primary air supplied from the primary air nozzle has a strong linearity and can reach the central part of the furnace where the gas flow rate in the furnace is large, which can promote the unburned fuel in this area. Burning. The secondary post-air supplied from the secondary post-air nozzle can be widened horizontally in the furnace from side to side, and can promote unburned fraction combustion in the area near the front and rear walls of the furnace where the gas flow rate in the furnace is small. In this way, the rear air can be appropriately supplied across the entire stove from both the primary rear air and the secondary rear air, so that the unburned content of the fuel can be prevented from slipping between the rear air ports, and the unburned content remaining at the exit of the stove can be suppressed. [Prior Art Literature] [Patent Literature]

[Patent Document 1] International Publication No. 2015/005350

[Problems to be Solved by the Invention]

However, in the configuration disclosed in Patent Document 1, as shown in FIG. 12, ash and the like floating in the furnace are guided toward the center portion of the furnace 5 from the rear air vents 1 with high straightness, as shown in FIG. 12. In the case where the companion flow of the straight forward flow Fd of the blown air once adheres to the furnace wall 2 or the like. Ash and the like are adhered to, for example, the opening edge portion 3 of the front end of the rear air port 1 of the furnace wall 2. The adhered ash and the like grow over time to form an ash block C, and have the following characteristics: they hinder the rear air port 1 There is a possibility that the blast of the rear air sprayed and the attached ash block C will fall into the furnace 5 and damage the furnace 5.

The present invention has been made in view of this, and an object thereof is to provide a combustion device that can suppress the ash flowing in the furnace from adhering to the upper and lower openings of the furnace that spray the rear air. [Means to solve the problem]

One aspect of the present invention is a combustion device including a furnace that is continuous in the up-down direction, and a torch that burns the fuel by supplying fuel into the furnace and air that is less than the theoretically required amount of air, and is provided with a ratio of The rear air supply unit for supplying the rear air to the furnace in order to burn the fuel in the unburned state after the burner has been installed on the downstream side of the installation position of the blowtorch in the furnace, the rear air supply unit includes: : A cylindrical casing extending in a direction intersecting the furnace wall of the furnace; and a first nozzle formed on the inner side of the casing at a central portion in the horizontal direction and ejecting rear air that goes straight toward the inside of the furnace; and On the inner side of the housing, the first nozzles are formed on both sides in the horizontal direction, and the rear air sprayed toward the inside of the furnace is provided with a direction deviating from the first nozzle to the left and right sides in a horizontal direction. The second nozzle of the deflection member; and gradually enlarged in diameter from the front end portion of the casing toward the inside of the furnace in a full circumferential direction. Diameter continuous furnace wall surface; and a tip portion disposed in the first nozzle portion of the air from the inside of the furnace to be discharged toward the first surface of the nozzle diameter along the guide member of the lower flow.

According to this configuration, by flowing a part of the rear air ejected from the first nozzle into the furnace along the enlarged diameter surface, it is possible to prevent ash and the like floating in the furnace from adhering to the enlarged diameter surface.

In the above aspect, it is more preferable that the guide member has a guide member deflection portion that deflects a part of the rear air ejected into the furnace toward both sides of the furnace in the up-down direction.

According to this structure, a part of the rear air ejected from the furnace is deflected toward the inner side of the furnace by the guide member deflection portion toward both sides in the up-and-down direction, so that part of the rear air can be moved up and down along the enlarged diameter surface The Ministry definitely flows.

In the above aspect, the deflection portion of the guide member is made to be movable in a forward-backward direction toward an inner side of the furnace, and it is more preferable to adjust a size of a gap with the enlarged diameter surface.

According to this configuration, by adjusting the size of the gap with the enlarged diameter surface by moving the guide member deflection portion, the flow rate of the rear air flowing between the deflection plate and the enlarged diameter surface can be increased or decreased. Thereby, the intensity of the flow of the rear air along the enlarged diameter surface can be adjusted.

In the aspect described above, the deflector of the guide member includes a first surface facing a side facing the enlarged diameter surface and a second surface facing an inner side of the stove so that a part of the rear air can be circulated. The words of the connecting part are even better.

According to this structure, a part of the rear air flowing along the enlarged diameter surface by the deflection portion of the guide member can pass through the communication portion to the inside surface facing the furnace from the first surface side facing the enlarged diameter surface. The second side guide. Thereby, since the rear air flows out from the second surface side of the guide member deflection portion toward the inside of the furnace, it is possible to further suppress adhesion of ash and the like to the guide member deflection portion.

In the above aspect, it is further preferred that the guide member biasing portion is configured by arranging a plurality of fins at intervals from each other, and forming a slit between the fins adjacent to each other.

According to this configuration, a part of the rear air flowing along the enlarged diameter surface by the deflection portion of the guide member can be faced from the enlarged diameter surface through the slits formed between the plurality of fins. The first side is guided toward the second side facing the inside of the furnace.

In the above aspect, it is more preferable that the communication portion is formed of a plurality of holes penetrating the first surface and the second surface of the deflection portion of the guide member.

According to this configuration, a part of the rear air flowing along the enlarged diameter surface by the deflection plate can pass through the plurality of holes formed in the deflection plate, and face the inside of the furnace from the first side facing the enlarged diameter surface. The second face side is guided.

In the aspect described above, a third nozzle is formed to surround the first nozzle and to eject the rear air that is directed inward of the furnace, and the guide member is arranged along the upper and lower sides of the third nozzle. It is more preferable that edge portions on both sides of the direction are provided, and a part of the rear air flowing in the third nozzle is deflected toward the inside of the furnace toward both sides in the vertical direction.

According to this configuration, the guide member deflection portion allows a part of the rear air flowing in the third nozzle formed by surrounding the first nozzle to flow along the upper and lower surfaces of the enlarged diameter surface, thereby suppressing ash and the like. It is attached to the lower part of the enlarged diameter surface. [Effect of the invention]

According to the combustion device of the present invention, it is possible to prevent the ash or the like existing in the furnace from adhering to the opening portion that ejects the rear air into the furnace.

[First Embodiment] (1) Hereinafter, a first embodiment of the present invention will be described using FIG. As shown in FIG. 1, the boiler (combustion device) 10A includes a furnace 11, a torch unit 12, and a rear air supply unit 13.

The furnace 11 is formed in a cylindrical shape extending in a vertical direction from a rectangular shape in a plan view. A plurality of water pipes (not shown) extending in the vertical direction are provided along the inner side surface of the furnace 11. The furnace exit 11d on the upper part of the furnace 11 is connected to a flue 14 extending in a horizontal direction.

Here, in the following description, the horizontally extending from the furnace exit 11d to the side of the flue duct 14 is set to the rear, and the horizontally from the furnace exit 11d to the side of the flue 14 extending side is set to the front. That is, in the furnace wall 15 forming the inner peripheral surface of the furnace 11, the portion located on the extension side of the flue 14 is a portion provided as the rear wall 15r, which faces the rear wall 15r and is located on the opposite side to the extension side of the flue 14. It is set to the front wall 15f. In addition, in the furnace wall 15, the side walls 15 s are provided as portions facing the front wall 15 f and the rear wall 15 r on both sides of the direction perpendicular to each other in the horizontal plane.

The torch unit 12 is a lower portion provided inside the furnace 11. The torch unit 12 includes a plurality of torches 20. As shown in FIG. 2, these plural torches 20 are provided in the furnace 11 on the front wall 15 f and the rear wall 15 r at intervals in the vertical direction and the horizontal direction, respectively. Each torch 20 sprays fine powder fuel and air obtained by pulverizing stone carbon into the furnace 11 and burns in the furnace 11 to generate flame. The torch unit 12 forms a main combustion zone Z1 by flames emitted from the plurality of torches 20. Here, the air supplied into each of the furnaces 11 from each of the torches 20 is less than the theoretically necessary amount of air necessary for complete combustion of the fine powder fuel supplied to the torches 20. Accordingly, the combustion in the main combustion zone Z1 formed by the torch section 12 is performed in a reducing atmosphere.

The rear air supply unit 13 is provided in the furnace 11 above the vertical direction UD on the downstream side from the installation position of the torch 20 in the torch unit 12. The rear air supply unit 13 includes a plurality of rear air nozzles 30. These rear air nozzles 30 are arranged on the front wall 15f and the rear wall 15r of the furnace 11 at intervals in the vertical direction and the horizontal direction, respectively. Each of the rear air nozzles 30 sends rear air (air) into the furnace 11 from the outside of the furnace 11. The rear air sent from each of the rear air nozzles 30 is the air necessary to burn the unburned fuel (unburned fraction) remaining after the combustion in the main combustion zone Z1. As described above, the rear air supply unit 13 supplies the rear air above the main combustion zone Z1 to form a combustion-completed zone Z2 in which the unburned fuel remaining in the combustion of the main combustion zone Z1 is burned.

As shown in FIGS. 3 to 5, each rear air nozzle 30 includes a housing 31, a first nozzle 32, a second nozzle 33, and a guide member 40A.

The casing 31 is formed in a cylindrical shape, for example, and is provided so as to extend in the front-rear direction FR perpendicularly crossing the front wall 15f or the rear wall 15r of the furnace wall 15 of the furnace 11. The outer casing 31 is provided with its front end portion 31s closer to the outside of the furnace 11 than the surface of the front wall 15f or the rear wall 15r.

As shown in FIG. 4 and FIG. 5, the front end portion 31 s of the casing 31 is formed to gradually expand in diameter from the front end portion 31 s of the casing 31 toward the inside of the furnace 11 over the entire circumference to the front wall of the furnace wall 15. 15f or the enlarged diameter surface 16 connected to the surface of the rear wall 15r.

As shown in FIGS. 3 and 4, a pair of partition plates 35 and 35 are provided on the inner side of the casing 31 on both sides of the horizontal direction LR that holds the central axis Ac. Each partition plate 35 is located in a vertical plane including the vertical direction UD, and is continuous with the front-back direction FR in which the casing 31 extends. As a result, the first nozzle 32 formed at the center portion of the horizontal direction LR of the casing 31 and the first nozzle 32 are formed between the pair of partition plates 35 and 35 on the inner side of the casing 31. The partition plates 35 and 35 are formed on the outer side of the second nozzles 33 and 33 on both sides in the horizontal direction LR.

In the first nozzle 32 and the second nozzles 33 and 33 inside the casing 31, the rear air is distributed from the outside of the furnace 11.

The first nozzle 32 ejects the rear air into a straight flow Fd that is directed toward the inside of the furnace 11 in the front-rear direction FR. Here, the first nozzle 32 is provided on the front wall 15f and the rear wall 15r of the furnace 11, so in this embodiment, the first nozzle 32 provided on the front wall 15f and the first nozzle 32 provided on the rear wall 15r are provided. The rear air ejected from each of the nozzles face each other in the central portions of the furnace 11 in the front-rear direction FR.

Each of the second nozzles 33 is provided at a distal end portion facing the inside of the furnace 11 with rear air that is ejected toward the inside of the furnace 11 and is deflected in a horizontal direction LR from the first nozzle 32 toward the left and right sides. The fin-shaped deflection members 33f and 33g. As a result, the rear air ejected from the pair of second nozzles 33 and 33 provided on both sides of the first nozzle 32 in the horizontal direction LR toward the inside of the furnace 11 is separated from the first nozzle 32 in the central portion toward the horizontal direction LR. Biased.

As shown in FIG. 5, the guide member 40A is provided inside the front end portion 31 s of the case 31 and guides a part of the rear air ejected from the inside of the case 31 toward the inside of the furnace 11 along the enlarged diameter surface 16. As shown in FIG. 3, the guide member 40A is provided along the edges on both sides of the first nozzle 32 in the vertical direction UD. In this embodiment, the housing 31 is cylindrical, and when the opening in the front wall 15f or the rear wall 15r of the rear air nozzle 30 is seen from the direction along the central axis Ac, the vertical direction of the first nozzle 32 is UD. The edges on both sides are arc-shaped. With this, the shape of the guide member 40A seen from the direction along the central axis Ac is formed into an arc shape.

As shown in FIG. 5, the guide member 40A is integrally provided with a base portion 42 and a deflection portion 41A supported by the housing 31 through a support member (not shown). The base base portion 42 is arranged at intervals on the inner peripheral side with respect to the upper and lower inner peripheral surfaces 31f of the case 31. The yaw deflection portion 41A is formed at an end of the base portion 42 that extends from the inner side of the furnace 11 toward the inside of the furnace 11 and extends obliquely from the central axis Ac toward the outside in the radial direction.

This guide member 40A deflects a part of the rear air flowing in the first nozzle 32 toward both sides of the furnace 11 in the vertical direction UD. The flow F of the rear air deflected by the guide member 40A flows along the enlarged diameter surface 16. Here, the flow rate of the rear air that is biased toward both sides in the vertical direction UD by the guide member 40A is formed by the rear air that flows in the first nozzle 32 and flows straight into the interior of the furnace 11. Less than 10% of the flow is preferred. Here, the cross-sectional area of the rear air flow path formed in the gap between the guide member 40A and the inner peripheral surface 31f of the housing 31 is less than about 1/10 of the rear air flow path in the first nozzle 32. good. Further, the deflection portion 41A does not adhere to the ash and the like that float on the companion flow generated in the furnace 11 by the companion of the direct flow Fd, and moves from the inside of the furnace 11 along the central axis Ac direction. The projected area at the time of view is preferably as small as possible. For example, in the guide member 40A formed in an arc shape when viewed from the direction of the central axis Ac, the dimension in the radial direction centered on the central axis Ac of the deflection portion 41A is 1/100 to 1 / of the diameter of the housing 31. It is better to form 30 degrees.

Here, the guide member 40A may be movable along the central axis Ac direction, and may be moved forward and backward inward of the furnace 11. This allows the deflection portion 41A to adjust the size of the gap with the enlarged diameter surface 16. By adjusting the size of the gap with the enlarged diameter surface 16 by moving the deflection portion 41A, the flow rate of the rear air flowing through the gap between the deflection portion 41A and the enlarged diameter surface 16 can be increased or decreased. Thereby, the intensity of the flow of the rear air along the enlarged diameter surface 16 can be adjusted.

According to the boiler 10A as described above, a part of the rear air ejected from the inside of the casing 31 toward the inside of the furnace 11 flows along the enlarged diameter surface 16 by the guide member 40A. As a result, it is possible to prevent ash and the like floating on the companion flow of the straight flow Fd ejected from the first nozzle 32 from adhering to the enlarged diameter surface 16.

The guide member 40A has a deflection portion 41A. By this deflection portion 41A, a part of the rear air sprayed out of the furnace 11 is deflected toward both sides of the furnace 11 in the up-down direction UD, and the rear air can be reliably flowed along the enlarged diameter surface 16.

In addition, since the guide member 40A is provided along the edges on both sides of the first nozzle 32 in the up-and-down direction UD, the guide member 40A can direct a part of the rear air flowing in the first nozzle 32 toward Both sides of the up-down direction UD flow deviated along the enlarged diameter surface 16.

In addition, the deflection portion 41A is made movable in the forward and backward direction toward the inside of the furnace 11, and the size of the gap with the enlarged diameter surface 16 can be adjusted. This makes it possible to increase or decrease the flow rate of the rear air flowing between the deflection portion 41A and the enlarged diameter surface 16. Thereby, the intensity of the flow of the rear air along the enlarged diameter surface 16 can be adjusted, and the adhesion of ash and the like floating in the furnace 11 can be more reliably suppressed.

[Second Embodiment] Next, a second embodiment of the combustion device of the present invention will be described. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and descriptions thereof will be omitted. As shown in FIG. 1, the boiler (combustion device) 10B in this embodiment is similar to the boiler 10A in the first embodiment, and includes a furnace 11, a torch unit 12, and a rear air nozzle 30. After the air supply unit 13.

As shown in FIG. 6, each rear air nozzle 30 includes a housing 31, a first nozzle 32, a second nozzle 33, and a guide member 40B.

The guide member 40B guides a part of the rear air ejected from the inside of the casing 31 toward the inside of the furnace 11 along the enlarged diameter surface 16. The guide member 40B is integrally provided with a base portion 42 and a deflection portion 41B.

The deflection portion 41B is formed at an end portion of the base portion 42 toward the inner side of the furnace 11, and extends toward the outside in the radial direction from the central axis Ac toward the inside of the furnace 11, and is formed substantially parallel to the enlarged diameter surface 16. The yaw deflection portion 41B includes a communication portion 43B that communicates the first surface 41f facing the enlarged diameter surface 16 and the second surface 41g facing the inner side of the furnace 11 to allow the rear air to circulate. The communication portion 43B is provided with a plurality of fins 44. The fins 44 are arranged at intervals from each other along the direction extending from the central axis Ac toward the outside in the radial direction as they go toward the inside of the furnace 11. Thereby, the communication part 43B has the slit 45 formed between the fins 44 adjacent to each other.

In such a guide member 40B, a part of the rear air flowing in the first nozzle 32 is deflected toward the inner side of the furnace 11 toward both sides in the vertical direction UD. The flow F of the rear air deflected by the guide member 40B flows along the enlarged diameter surface 16. Here, in the communication portion 43B formed in the deflection portion 41B, a part of the rear air flowing along the enlarged diameter surface 16 by the deflection portion 41B is deflected by a plurality of fins 44 formed between each other. The slit 45 is guided from the first surface 41f side facing the enlarged diameter surface 16 toward the second surface 41g side facing the inside of the furnace 11.

According to the boiler 10B as described above, as in the first embodiment, a part of the rear air ejected from the inside of the casing 31 toward the furnace 11 can flow along the enlarged diameter surface 16 by the guide member 40B. Ashes and the like floating in the furnace 11 are prevented from adhering to the enlarged diameter surface 16.

A part of the rear air flowing along the enlarged diameter surface 16 due to the deflection portion 41B can pass through the communication portion 43 from the side of the first surface 41f facing the enlarged diameter surface 16 toward the inside of the furnace 11. The second side 41g is guided on the side. Thereby, since the rear air flows out from the side of the second surface 41g of the deflection portion 41B toward the inside of the furnace 11, it is possible to more reliably suppress ash from adhering to the deflection portion 41B.

[Third Embodiment] Next, a third embodiment of the combustion device of the present invention will be described. In the following description, the same components as those in the first and second embodiments are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 1, the boiler (combustion device) 10C in this embodiment is the same as the boiler 10A in the first embodiment, and includes a furnace 11, a torch unit 12, and a rear air nozzle 30. After the air supply unit 13.

As shown in FIGS. 7 and 8, each rear air nozzle 30 includes a housing 31, a first nozzle 32, a second nozzle 33, and a guide member 40C.

The guide member 40C guides a part of the rear air ejected from the inside of the casing 31 into the furnace 11 along the enlarged diameter surface 16. The guide member 40C is integrally provided with a base portion 42 and a deflection portion 41C.

The deflection portion 41C is formed at an end portion of the base portion 42 toward the inner side of the furnace 11, and extends obliquely toward the outside in the radial direction from the central axis Ac toward the inside of the furnace 11, and is formed substantially parallel to the enlarged diameter surface 16. The yaw deflection portion 41C includes a communication portion 43C that communicates the first surface 41f on the side facing the enlarged diameter surface 16 and the second surface 41g on the inner side of the furnace 11 to allow the rear air to circulate. The communication portion 43C is formed of a plurality of holes 47 penetrating the first surface 41f and the second surface 41g of the deflection portion 41B.

In such a guide member 40C, a part of the rear air flowing in the first nozzle 32 is deflected toward the inside of the furnace 11 toward both sides in the vertical direction UD. The flow F of the rear air deflected by the guide member 40C flows along the enlarged diameter surface 16. Here, in the communication portion 43C formed in the deflection portion 41C, a part of the rear air flowing along the enlarged diameter surface 16 by being deflected by the deflection portion 41C passes through the plurality of holes 47 and faces the enlarged diameter surface 16. The opposing first surface 41f side is guided toward the second surface 41g side facing the inside of the furnace 11.

According to the boiler 10C as described above, similarly to the first embodiment, the guide member 40C can flow a part of the rear air ejected from the inside of the casing 31 toward the inside of the furnace 11 along the enlarged diameter surface 16. Ashes and the like floating in the furnace 11 are prevented from adhering to the enlarged diameter surface 16.

A part of the rear air flowing along the enlarged diameter surface 16 due to the deflection portion 41C can pass through the communication portion 43 from the side of the first surface 41f facing the enlarged diameter surface 16 toward the inside of the furnace 11. The second side 41g is guided on the side. Thereby, since the rear air flows out from the second surface 41g side of the deflection portion 41C toward the inside of the furnace 11, the adhesion of ash to the deflection portion 41C can be more surely suppressed. Since the communication portion 43 is formed of a plurality of holes 47 formed in the deflection portion 41C, the configuration is simpler than that of the configuration including the plural fins 44 shown in the second embodiment. Therefore, manufacturing of the guide member 40 is also easy, and the above-mentioned effect can be achieved at a low cost.

[Fourth Embodiment] Next, a fourth embodiment of the combustion device of the present invention will be described. In the following description, the same components as those in the first to third embodiments are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 1, the boiler (combustion device) 10D in this embodiment is the same as the boiler 10A in the first embodiment, and includes a furnace 11, a torch unit 12, and a rear air nozzle 30D. After the air supply unit 13.

As shown in FIGS. 9 to 11, each rear air nozzle 30D includes a housing 31, a first nozzle 32D, a second nozzle 33, a third nozzle 50, and a guide member 40D.

A pair of partition plates 35 and 35 are provided on the inner side of the case 31 on both sides of the horizontal direction LR that holds the central axis Ac. In addition, a cylindrical body 37 having a rectangular cross section in the vertical direction UD is provided between the pair of partition plates 35 and 35 on the inner side of the casing 31. This cylindrical body 37 is spaced apart from each other between a pair of partition plates 35 and 35 on both sides in the horizontal direction LR and the upper and lower inner peripheral surfaces of the casing 31 on both sides in the vertical direction UD. Settings.

Thereby, the first nozzle 32D formed inside the cylindrical body 37 between the pair of partition plates 35 and 35 is formed inside the casing 31, and the partition plates 35 and 35 are formed to be held horizontally. The second nozzles 33 and 33 on both outer sides in the direction LR, and the third nozzle 50 formed on the outer side of the cylindrical body 37 between the pair of partition plates 35 and 35.

The first nozzle 32D, the second nozzles 33, 33, and the third nozzle 50 on the inner side of the casing 31 respectively distribute the rear air from the outside of the furnace 11.

The first nozzle 32D and the third nozzle 50 are ejected in a straight flow Fd that forms the rear air toward the inside of the furnace 11 in the forward and backward direction FR.

The guide member 40D is provided along edges of both sides of the third nozzle 50 in the vertical direction UD. This guide member 40D has the same structure as the guide members 40A to 40C shown in the first to third embodiments. The guide member 40D deflects a part of the rear air flowing in the third nozzle 50 toward the inside of the furnace 11 toward both sides in the vertical direction UD.

According to the boiler 10D as described above, as in the first embodiment, a part of the rear air ejected from the inside of the casing 31 toward the furnace 11 can flow along the enlarged diameter surface 16 by the guide member 40D. Ashes and the like floating in the furnace 11 are prevented from adhering to the enlarged diameter surface 16. Here, the guide member 40D deflects a part of the rear air flowing in the third nozzle 50. Accordingly, the straight flow Fd ejected from the first nozzle 32D into the furnace 11 is not affected by the deflection caused by the guide member 40D. Therefore, by maintaining the direct flow Fd from the first nozzle 32D, the rear air can be reliably reached to the center of the furnace 11 and the fuel in the unburned state is completely burned, so that the unburned residue can be reduced.

In addition, in the above-mentioned embodiment, for example, the overall configuration of the boilers 10A to 10D and the like are within the scope of the gist of the present invention, and the configuration of each unit can be appropriately changed. Furthermore, the configurations shown in the above embodiments may be used in appropriate combination.

10A ～ 10D‧‧‧‧Boiler (combustion device)

11‧‧‧ Stove

13‧‧‧ rear air supply department

15‧‧‧furnace wall

15f‧‧‧ front wall

15r‧‧‧ rear wall

16‧‧‧Expansion surface

20‧‧‧ Blowtorch

30, 30D‧‧‧ rear air nozzle

31‧‧‧shell

31s‧‧‧tip

32, 32D‧‧‧first nozzle

33‧‧‧Second Nozzle

33f, 33g

40A ～ 40D‧‧‧Guide members

41A ～ 41C ‧‧‧ deflection section (guide member deflection section)

41f‧‧‧First

41g‧‧‧Second side

42‧‧‧ base

43, 43B, 43C‧‧‧ Connected

44‧‧‧ fins

45‧‧‧Slit

47‧‧‧hole

50‧‧‧ third nozzle

Ac‧‧‧center axis

Fd‧‧‧ straight flow

Z1‧‧‧Main combustion zone

Z2‧‧‧ Burned End Zone

[FIG. 1] A diagram showing a schematic configuration of an entire combustion device according to an embodiment of the present invention. [Fig. 2] A view showing a torch and a rear air supply unit provided in a furnace wall of a combustion device according to an embodiment of the present invention. [Figure 3] A first embodiment of the present invention is a view of a rear air nozzle provided in a rear air supply section of a combustion device, as viewed from a direction along a central axis from the inside of a furnace. [FIG. 4] The first embodiment of the present invention is a view showing a rear air nozzle formed by a rear air supply unit provided in a combustion device, and a cross-sectional view taken along the arrow H-H of FIG. 3. [FIG. 5] A first embodiment of the present invention is a view showing a rear air nozzle formed by a rear air supply unit provided in a combustion device, and a cross-sectional view taken along the arrow V-V in FIG. 3. [FIG. 6] A second embodiment of the present invention is a vertical cross-sectional view of a rear air nozzle including a rear air supply unit provided in a combustion device. [FIG. 7] A third embodiment of the present invention is a view of a rear air nozzle provided in a rear air supply portion of a combustion device, viewed from a direction along a central axis from the inside of a furnace. [Figure 8] A third embodiment of the present invention is a vertical cross-sectional view of a rear air nozzle including a rear air supply unit provided in a combustion device. [FIG. 9] In a fourth embodiment of the present invention, a rear air nozzle provided in a rear air supply section of a combustion device is viewed from the inside of the furnace along a central axis. [Fig. 10] A fourth embodiment of the present invention is a view showing a rear air nozzle formed by a rear air supply unit provided in a combustion device, and a sectional view taken along a line H-H in Fig. 9. [FIG. 11] A fourth embodiment of the present invention is a diagram showing a rear air nozzle formed by a rear air supply unit provided in a combustion device, and a cross-sectional view taken along the arrow V-V of FIG. 9.第 [Fig. 12] A longitudinal sectional view showing a conventional rear air nozzle.

Claims (7)

A combustion device includes a continuous furnace in a vertical direction, a torch for burning the fuel by supplying fuel and air with a theoretically necessary amount of air into the furnace, and a burner provided in the burner than the burner in the furnace. The rear air supply unit is provided further downstream and supplies rear air to the furnace for burning the fuel in the unburned state after being burned by the torch. The rear air supply unit includes a furnace facing the furnace. A cylindrical casing extending in a direction in which the walls intersect; and a first nozzle formed on the inner side of the casing at a horizontal central portion and ejecting rear air that goes straight toward the inside of the furnace; and on the inner side of the casing, The first nozzles are formed on both sides in the horizontal direction, and are provided with second nozzles for deflecting members that deflect the rear air sprayed toward the inside of the furnace from the first nozzle in a horizontal direction from the first nozzle to the left and right sides. ; And from the front end portion of the casing toward the inside of the furnace, the diameter of the furnace wall continuously expands gradually in the entire circumferential direction. And a guide member provided at a front end portion of the first nozzle, and a part of the rear air ejected from the first nozzle into the furnace flows along the upper and lower surfaces of the enlarged diameter surface, and when the guide member runs along the casing When viewed in the direction of the central axis, the shape of the edge portions on both sides of the first nozzle in the vertical direction is formed into an arc shape, and the guide member is formed into an arc shape corresponding to the edge portion. For example, in the combustion device according to the scope of patent application, the guide member includes a guide that deflects a part of the rear air ejected from the furnace toward the inner side of the furnace toward both sides in the vertical direction. Component deflection. For example, in the combustion device according to the second item of the patent application, the guide member deflection portion is made to be movable toward the inside of the furnace and moved forward and backward, and the size of the gap with the enlarged diameter surface can be adjusted. For example, in the combustion device according to item 2 of the patent application, wherein the guide member deflection portion includes a first surface facing a side facing the enlarged diameter surface and a second surface facing an inner side of the furnace, A communication portion that allows a part of the rear air to circulate. For example, in the combustion device according to item 4 of the patent application, the guide member biasing portion is configured by arranging a plurality of fins at intervals with each other, and between the fins adjacent to each other. Form a slit. In the combustion device according to item 4 of the patent application scope, the communication portion is formed of a plurality of holes penetrating the first surface and the second surface of the deflection portion of the guide member. The combustion device according to any one of claims 1 to 6, further comprising: a third device that surrounds the periphery of the first nozzle, and ejects a third of the rear air that goes straight into the furnace. The nozzle and the guide member are provided along edges of both sides of the third nozzle in the up-and-down direction, and a part of the rear air flowing in the third nozzle faces the inside of the furnace toward both sides in the up-and-down direction. Biased.