CN115013810A - Combustion apparatus - Google Patents

Combustion apparatus Download PDF

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Publication number
CN115013810A
CN115013810A CN202210157342.9A CN202210157342A CN115013810A CN 115013810 A CN115013810 A CN 115013810A CN 202210157342 A CN202210157342 A CN 202210157342A CN 115013810 A CN115013810 A CN 115013810A
Authority
CN
China
Prior art keywords
burner
plate
burners
flame
rear direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210157342.9A
Other languages
Chinese (zh)
Inventor
武田和也
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rinnai Corp
Original Assignee
Rinnai Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rinnai Corp filed Critical Rinnai Corp
Publication of CN115013810A publication Critical patent/CN115013810A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • F23D14/586—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits formed by a set of sheets, strips, ribbons or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14003—Special features of gas burners with more than one nozzle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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

Abstract

The invention provides a combustion device, wherein a plurality of burners (2) which are provided with flame ports (23) for ejecting mixed gas at the upper end and are long in the front-back direction are arranged in parallel in a combustion shell, a delay burning plate (19) for blocking the rise of secondary air is arranged in a mode that the gap between the burners is positioned near the upper end of a front-back direction part which is consistent with the front-back end of a flame port forming area of each burner (2), and even if the gap between the outer side surface of each burner (2) and the side edge of the delay burning plate (19) is slightly enlarged due to the error of the transverse width of the burners (2) and the delay burning plate (19), the deterioration of fire delay burning performance can be reliably prevented. A protruding part (29) protruding laterally outward from the part of the outer surface of the burner adjacent to the part in the front-rear direction of the outer surface of the burner (2) that is located above the extension plate (19) and at a position in the front-rear direction that coincides with the extension plate (19) is provided.

Description

Combustion apparatus
Technical Field
The present invention relates to a combustion apparatus including a combustion casing, in which a plurality of burners are arranged side by side with a gap in the lateral direction, each of the plurality of burners having a flame hole for ejecting a mixture gas at an upper end thereof and being long in the front-rear direction, and secondary air is supplied from below to the gap between the burners.
Background
Conventionally, in such a combustion apparatus, a flame extension plate that inhibits the rise of secondary air is generally disposed in a gap between the burners so as to be located in the vicinity of an upper end of a portion in the front-rear direction that coincides with one of front and rear ends of a flame port formation region of each burner (see patent document 1). If the extension burner is disposed, the secondary air is less likely to flow directly above the extension burner. Therefore, a part of the mixed gas jetted from the flame ports of one burner and a part of the mixed gas jetted from the flame ports of the other burner, which are adjacent in the lateral direction, are retained directly above the flame extension plate, thereby promoting flame extension from the one burner to the other burner.
However, if the gap between the outer surface of the burner and the side edge of the flame retardant plate is enlarged due to the error in the lateral width of the burner and the flame retardant plate, the secondary air flows upward through the gap, and the mixture gas staying directly above the flame retardant plate is blown off by the secondary air, thereby deteriorating the flame retardant performance.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 5-280715
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a combustion apparatus capable of reliably preventing deterioration of ignition performance.
In order to solve the above problems, the present invention relates to a combustion apparatus including a combustion casing, a plurality of burners are arranged side by side in the combustion chamber in the combustion casing with a gap in the lateral direction, the plurality of burners have flame ports for ejecting the mixture gas at the upper ends thereof, are long in the front-rear direction, supply the secondary air from below to the gaps between the burners, characterized in that a flame extension plate for preventing secondary air from rising is disposed in a gap between the burners so as to be located in the vicinity of the upper end of a portion in the front-rear direction that coincides with the front-rear end of a flame port formation region of each burner, a portion of the outer surface of the burner, which is located above the extension plate at a position in the front-rear direction that coincides with the extension plate, is provided with a bulging portion that bulges laterally outward beyond a portion of the outer surface of the burner adjacent to the portion in the front-rear direction.
According to the present invention, even if the gap between the outer surface of the burner and the side edge of the extension burner plate is slightly enlarged due to the error in the lateral width of the burner and the extension burner plate, a large lateral component is given to the flow of the secondary air directed upward of the extension burner plate through the gap by the projection portion, and the effect of reducing the momentum of the secondary air directed upward can be obtained. Therefore, the mixture gas staying directly above the glowing plate can be effectively suppressed from being blown off by the secondary air. In addition, in a portion that coincides with the extension combustion plate, the distance between the flame ports of one burner and the other burner that are adjacent in the lateral direction is narrowed by the bulging portion, thereby facilitating extension combustion of fire between these flame ports. In addition, this and the synergistic effect of the above described case in which the mixed gas staying directly above the extension burner plate is blown off by the secondary air can be effectively suppressed, and the deterioration of the ignition delay performance can be reliably prevented. Further, since the portion of the outer surface of the burner adjacent to the bulging portion in the front-rear direction does not bulge laterally outward, the secondary air is sufficiently supplied to the mixture gas jetted from the flame ports, and the combustibility is not deteriorated.
Drawings
Fig. 1 is a perspective view of a combustion apparatus according to an embodiment of the present invention.
Fig. 2 is a sectional side view taken along line ii-ii in fig. 1.
Fig. 3 is a sectional plan view taken along line iii-iii in fig. 2.
Fig. 4 is an enlarged cross-sectional view of a main portion taken along line iv-iv in fig. 3.
Fig. 5 is a perspective view of a burner provided in the combustion apparatus according to the embodiment.
Fig. 6 is a sectional view of the burner cut along line vi-vi in fig. 5.
Fig. 7 is a perspective view of a burner pressing plate provided in a combustion casing of the combustion apparatus according to the embodiment.
Description of the reference numerals
1 … combustion casing; 19 … spreading burning board; 2 … burner; 23 … flame ports; 29 … bulge.
Detailed Description
Referring to fig. 1 to 3, a combustion apparatus according to an embodiment of the present invention includes: a combustion casing 1; a plurality of (6 in the present embodiment) burners 2; they are arranged side by side in the lower part of the combustion casing 1 with a gap in the lateral direction and are long in the front-rear direction; a gas manifold 3 for supplying a fuel gas to the combustor 2; and a heat exchanger 4 disposed at an upper portion in the combustion casing 1 and heated by the combustion gas from the burner 2. A water supply pipe 41 on the upstream side and a hot water discharge pipe 42 on the downstream side are connected to the heat exchanger 4. Further, a valve unit 5 for controlling the supply of the fuel gas is connected to the gas manifold 3.
Referring to fig. 5 and 6, the combustor 2 includes: a burner main body 21 having a pair of side plates 21a, 21a opposed to each other in the lateral direction; and a burner cover 22 having a pair of side plates 22a, 22a covering the burner main body 21 from the outer sides of both lateral sides. Further, a main flame port 23a and a side flame port 23b are provided at the upper end of the burner 2 as the flame ports 23 for ejecting the mixture gas, the main flame port 23a is located between the upper ends of the both side plates 21a, 21a of the burner main body 21, and the side flame port 23b is defined between the upper end of each side plate 21a of the burner main body 21 and the upper end of each side plate 22a of the burner cover 22. Further, a plurality of main flame ports 23a are formed at intervals in the front-rear direction in the upper plate portion 21b connecting the upper ends of the both side plates 21a, 21a of the burner main body 21.
The burner main body 21 is provided with: a lower mixing pipe section 24 extending rearward from an inlet port 24a at the front end; and a main mixture gas passage 25 extending upward and extending in the front-rear direction from the rear end portion of the mixture pipe portion 24. The mixed gas of the fuel gas and the primary air flowing in from the inlet port 24a is guided to the main flame ports 23a via the mixing pipe portion 24 and the main mixed gas passage 25.
A side flame mixed gas passage 26 connected to the side flame ports 23b is provided between each side plate 21a of the burner main body 21 and each side plate 22a of the burner cover 22. Further, a plurality of vent holes 26a that communicate the main mixture gas passage 25 with the side fire mixture gas passage 26 are formed at intervals in the front-rear direction in each side plate 21a of the burner main body 21, and these vent holes 26a are located at: the upper side of the lower portion of each side plate 22a of the burner cover 22 overlaps with each side plate 21a of the burner main body 21. The mixed gas branched from the main mixed gas passage 25 through these vent holes 26a is supplied to the side flame ports 23b through the side flame mixed gas passage 26. The main flame formed in the main flame ports 23a is held by the side flames formed in the side flame ports 23 b.
Further, each side plate 22a of the burner cover 22 has: and a groove portion 27 which is located above the vent hole 26a and is recessed inward in the lateral direction. Thus, the mixture gas flowing from the vent hole 26a into the side flame mixture passage 26 is distributed in the front-rear direction at a portion below the groove portion 27, and the uniformity of the distribution in the front-rear direction of the mixture gas jetted from the side flame ports 23b can be ensured. The burner cover 22 also has bridge portions 22b that connect the upper ends of the side plates 22a, 22a at a plurality of positions in the front-rear direction.
The combustion casing 1 is constituted to include: a front side plate 11 that covers a front surface portion of the combustion case 1 located above the gas manifold 3; side plates 12, 12 on both lateral sides; a side plate 13 on the rear side; and a bottom plate 14. Moreover, heat insulation plates 15, 16, 17 are provided so as to face the inner surfaces of the side plates 11, 12, 13 on the front, lateral and rear sides. Further, an electrode member 7 is attached to the front side plate 11, and the electrode member 7 includes: an ignition electrode 71 for igniting the burner 2; and a flame rod 72 for monitoring the flame of the burner 2.
Further, a combustor pressing plate 18 shown in fig. 7 is disposed inside the rear side plate 13, and the combustor pressing plate 18 includes: and a lower end pressing piece portion 181 engaged with a notch portion 28 formed at a lower portion of a rear end edge of the burner main body 21. The pressing piece 181 has a plurality of slit-shaped notches 182 into which portions of the rear edge of the burner main body 21 recessed forward in the recessed portion 28 are inserted, so as to position the respective burners 2, formed in correspondence with the plurality of burners 2.
Formed in the front of the bottom plate 14 are: a rising plate portion 141 rising upward at a rear position of the gas manifold 3; and an upper plate portion 142 bent forward from the upper end of the rising plate portion 141 and reaching the side plate 11 on the front side. The opening 143 facing the inlet 24a of each burner 2 is opened in the rising plate portion 141. Further, a ventilation adjusting plate 6 is disposed on the front surface of the rising plate portion 141, and the ventilation adjusting plate 6 has a plurality of openings 61 facing the inlets 24a of the respective burners 2 and through which the fuel gas and the primary air pass, corresponding to the plurality of burners 2. The ventilation adjusting plate 6 is fixed to the rising plate portion 141 by screws 62 at the upper end portion of the widthwise central portion thereof.
The bottom plate 14 is formed with a plurality of recessed portions 144 which sandwich the lower edges of the burners 2 from both lateral sides and are recessed upward, and a plurality of small holes 145. Further, a 2 nd rising plate portion 146 rising along the inner surface of the front side plate 11 is formed at the front end of the upper plate portion 142. Further, a plurality of claw portions 147 are formed by bending the upper end of the 2 nd rising plate portion 146, and the plurality of claw portions 147 are inserted into the gap between the front end portions of the adjacent burners 2, 2 to position the front end portion of the burner 2 in the lateral direction.
An exhaust fan 8 is connected to the upper end of the combustion casing 1 through an exhaust hood 81. A fan motor 82 is attached to the exhaust fan 8. The combustion gas passing through the heat exchanger 4 is sucked by the exhaust fan 8, and is discharged to the outside through an unillustrated exhaust duct connected to the outlet 83 of the exhaust fan 8. Further, the air for combustion is supplied to each burner 2 by the suction force of the exhaust fan 8. That is, the air sucked from the inlet port 24a through the openings 61 of the ventilation adjusting plate 6 and the openings 143 of the rising plate portion 141 is supplied as primary air for combustion to the respective burners 2, and the air sucked from the small holes 145 is supplied as secondary air for combustion from below to the gap between the respective burners 2, 2.
However, at the start of combustion, it is necessary to cause the flame to spread from the burner 2 facing the ignition electrode 71 to the other burners 2. Therefore, a flame extension plate 19 that prevents the secondary air from rising is provided in the gap between the burners 2 and 2 so as to be located near the upper end of the portion in the front-rear direction that coincides with the rear end of the flame-port formation region of each burner 2. Accordingly, the secondary air is less likely to flow to the right upper portion of the extension plate 19. Therefore, during the flame propagation, a part of the mixed gas jetted from the flame ports 23 of one of the adjacent burners 2 and a part of the mixed gas jetted from the flame ports 23 of the other burner 2 are retained directly above the flame propagation plate 19, and the flame propagation from one burner 2 to the other burner 2 is promoted.
As shown in fig. 4, the side edge of the extension plate 19 is inserted into the groove 27, and the groove 27 is formed in: the outer surface of the burner 2, that is, the vertical position of each side plate 22a of the burner cover 22, which coincides with the extension plate 19. Accordingly, even if the gap between the side surface of the groove portion 27 and the side edge of the extension plate 19 is slightly enlarged due to the error in the lateral width of the burner 2 and the extension plate 19, the flow path of the secondary air that reaches upward from below the extension plate 19 through the gap is bent in the lateral direction in the groove portion 27, so that the ventilation resistance increases and the flow rate of the secondary air flowing to above the extension plate 19 does not increase so much.
Further, a tongue piece 19a extending obliquely forward and downward is provided at the front end of the flame retardant plate 19. The reason for providing the tongue piece portion 19a is as follows. In the vicinity of the front end of the flame extension plate 19, the upward flow of the secondary air swirls. When the swirl reaches the upper end of the combustor 2, the influence of the swirl adversely affects the combustibility of the combustor 2. When the tongue piece 19a is provided, the upward flow of secondary air swirls near the tip of the tongue piece 19 a. Therefore, the position of the vortex is shifted downward, and the vortex is hard to reach the upper end of the burner 2. As a result, the combustibility of the combustor 2 can be prevented from being deteriorated by the influence of the swirl. Further, the tongue piece 19a is formed to have a width smaller than that of the main body of the flame retardant sheet 19 having the side edge inserted into the groove 27 so that the tongue piece 19a extends downward than the groove 27.
However, the depth of the groove portion 27 recessed laterally inward cannot be increased so much that the ventilation resistance of the side fire mixed gas passage 26 does not become excessively large. Therefore, it is difficult to sufficiently increase the ventilation resistance of the secondary air in the groove portion 27.
Therefore, in the present embodiment, the bulging portion 29 bulging further outward in the lateral direction than the portion of the outer surface of the burner adjacent to the portion in the front-rear direction is provided at the front-rear direction position of the outer surface of the burner 2, that is, the side plate 22a of the burner cover 22, which coincides with the extension plate 19, and at the portion located above the groove portion 27, that is, above the extension plate 19. Accordingly, a large lateral component is given to the secondary air flow directed upward from the extension board 19 by the expansion portion 29, and the effect of reducing the upward momentum of the secondary air can be obtained. Therefore, even if the air flow resistance of the secondary air in the groove portion 27 cannot be sufficiently increased, the mixture gas staying just above the delay burning plate 19 can be effectively suppressed from being blown off by the secondary air. In addition, in a portion corresponding to the extension plate 19, the distance between the side flame ports 23b of one burner 2 and the side flame ports 23b of the other burner 2 adjacent in the lateral direction is narrowed by the bulging portion 29, so that the flame is easily extended between the side flame ports 23b, 23 b. This and the synergistic effect of the case where the mixed gas staying just above the flame retardant plate 19 is blown off by the secondary air can be effectively suppressed, and the deterioration of the flame retardant performance can be reliably prevented.
Further, since the portion of the outer surface of the burner adjacent to the bulging portion 29 in the front-rear direction does not bulge laterally outward, the secondary air is sufficiently supplied to the mixture gas ejected from the flame ports 23, and the combustibility is not deteriorated. In the present embodiment, as shown in fig. 7, a flame extension plate 19 is integrally formed at the upper end of the burner holding plate 18. This reduces the number of components and reduces the cost. In the present embodiment, a pair of bulging portions 29 are formed on each side plate 22a of the burner cover 22 in front-rear symmetry. Thus, even when the burner cover 22 is attached to the burner body 21 upside down, the bulge portion 29 is present in the front-rear direction portion that coincides with the extension plate 19. Therefore, the burner cap 22 can be attached to the burner body 21 without fear of the front-rear orientation, thereby improving the workability of assembling the burner cap 22.
The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited thereto. For example, in the above embodiment, the present invention is applied to the following combustion apparatus: the secondary air is supplied from below to the gap between the burners 2, 2 by the suction force of the exhaust fan 8, but the present invention can also be applied to the following combustion apparatus: an air supply chamber for supplying air from a fan is provided below the bottom plate 14 of the combustion case 1, and secondary air is supplied from below to the gap between the burners 2 and 2 through the air supply chamber.
Further, the combustor 2 may be a combustor without the combustor cover 22. In this case, a protruding portion protruding laterally outward from a portion of the outer surface of the burner 2, that is, the outer surface of the side plate 21a of the burner main body 21, which is located at a position in the front-rear direction corresponding to the extension plate 19 and above the extension plate 19 may be provided at a position adjacent to the portion in the front-rear direction. Further, the extension burner plate 19 may be disposed so that the gap between the burners 2 and 2 is located in the vicinity of the upper end of the portion in the front-rear direction that coincides with the front end of the flame port formation region of each burner 2.

Claims (1)

1. A combustion apparatus includes a combustion casing, a plurality of burners arranged in parallel with a gap in a lateral direction in the combustion casing, each of the plurality of burners having a flame hole for ejecting a mixture gas at an upper end thereof, being long in a front-rear direction, and supplying secondary air from below to the gap between the burners,
it is characterized in that the preparation method is characterized in that,
a flame extension plate for preventing secondary air from rising is arranged in the gap between the burners in a manner of being positioned near the upper end of the front-back direction part which is consistent with the front-back end of the flame port forming area of each burner,
a portion of the outer surface of the burner, which is located above the extension plate at a position in the front-rear direction that coincides with the extension plate, is provided with a bulging portion that bulges laterally outward beyond a portion of the outer surface of the burner adjacent to the portion in the front-rear direction.
CN202210157342.9A 2021-03-03 2022-02-21 Combustion apparatus Pending CN115013810A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021033823A JP2022134593A (en) 2021-03-03 2021-03-03 Combustor
JP2021-033823 2021-03-03

Publications (1)

Publication Number Publication Date
CN115013810A true CN115013810A (en) 2022-09-06

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ID=83067348

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210157342.9A Pending CN115013810A (en) 2021-03-03 2022-02-21 Combustion apparatus

Country Status (4)

Country Link
JP (1) JP2022134593A (en)
CN (1) CN115013810A (en)
BR (1) BR102022000517A2 (en)
TW (1) TW202300821A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116972417B (en) * 2023-08-31 2024-03-15 山东佰凯商用厨房设备有限公司 Burner with energy-saving energy-gathering function for gas-fired raking furnace

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TW202300821A (en) 2023-01-01
JP2022134593A (en) 2022-09-15
BR102022000517A2 (en) 2022-09-13

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