Combustion device

Abstract

To provide a combustion device in which multiple burners long in the front to rear direction juxtaposed are arranged in the lateral direction in a combustion chamber above a partition plate in a combustion casing, vent ports 411, 412 facing an inflow port open at the lower front end of the burner are formed on an air adjustment plate 4 attached to the front face of a standing plate disposed at the front end of the partition plate, and gas nozzles each injecting fuel gas toward the inflow port of the burner are provided in front of the standing plate, with some of the burners being non-combustion burners without burning fuel, and gas nozzles corresponding to the non-combustion burners made to be hole-less nozzles without having nozzle holes for injecting fuel gas, and to prevent air ejected from the non-combustion burners from decreasing thermal efficiency.SOLUTION: Among vent ports of an air adjustment plate 4, vent ports 411', 412' corresponding to non-combustion burners are made to have a smaller opening area relative to vent ports 411, 412 corresponding to burners other than the non-combustion burners, or are occluded.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a combustion device comprising a combustion housing, within which a partition plate is provided that divides the space within the combustion housing into a combustion chamber and an air supply chamber below the combustion chamber, a plurality of burners are arranged side by side in the combustion chamber, each burner being longitudinal in the front-to-rear direction and having a flame nozzle at an upper end and an inlet at a lower front end connected to the flame nozzle, a standing plate is provided that rises from the front end of the partition plate along the lower front ends of the plurality of burners, and a gas manifold is provided that is located in front of the standing plate and defines a primary air chamber that communicates with the air supply chamber between the standing plate and the standing plate. [Background technology]

[0002] Originally, in this type of combustion device, a plurality of communication ports that match the inlet of each burner are formed in the standing plate corresponding to the plurality of burners. An air adjustment plate is attached to the front surface of the standing plate, in which a plurality of vent holes facing the communication ports are formed corresponding to the plurality of burners. In addition, a plurality of gas nozzles facing the inlet of each burner are protruded from the rear surface of the gas manifold corresponding to the plurality of burners.

[0003] Generally, combustion devices with different specifications are manufactured by changing the number of burners according to the required capacity. However, when changing the number of burners, it is necessary to change the combustion case and all the parts associated with it, which increases the manufacturing cost.

[0004] In view of this, a known combustion device has been proposed in which some of the multiple burners are non-combustion burners that do not burn, and the gas nozzles corresponding to the non-combustion burners among the multiple gas nozzles in the gas manifold are holeless nozzles that do not have nozzle holes for spraying fuel gas, so that a combustion device with high capacity specifications can be used in a combustion device with low capacity requirements (see, for example, Patent Document 1).

[0005] In this case, the air control plate used in a combustion device with high capacity requirements is also used in a combustion device with low capacity requirements. Therefore, air flows into the inlet of the non-combustion burner through the vent of the air control plate, and this air is ejected from the non-combustion burner and hits the object to be heated, such as a heat exchanger. As a result, the object to be heated is cooled by the air, and the thermal efficiency is reduced. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-190735 A Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above, an object of the present invention is to provide a combustion device in which some of a plurality of burners are non-combustion burners that do not burn, thereby preventing a decrease in thermal efficiency. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a combustion device comprising a combustion housing, a partition plate disposed within the combustion housing that separates the space within the combustion housing into a combustion chamber and an air supply chamber below the combustion chamber, a plurality of burners arranged side by side in the lateral direction, each of which is longitudinal in the front-rear direction and has a flame port at its upper end and an inlet at its lower front end connected to the flame port, a standing plate is disposed that rises from the front end of the partition plate along the lower front ends of the plurality of burners, and a gas manifold is disposed in front of the standing plate and defines a primary air chamber that communicates with the air supply chamber between the standing plate and the standing plate, and a plurality of communication ports that correspond to the inlets of each burner are formed in the standing plate corresponding to the plurality of burners. An air adjustment plate is attached to the front surface of the standing plate, and has a plurality of vent holes facing the communication port formed therein corresponding to the plurality of burners, and a plurality of gas nozzles facing the inlet of each burner are protruded from the rear surface of the gas manifold corresponding to the plurality of burners, and further, some of the plurality of burners are non-combustion burners that do not produce combustion, and the gas nozzles corresponding to the non-combustion burners are holeless nozzles that do not have nozzle holes for spraying fuel gas, and the vent holes of the air adjustment plate corresponding to the non-combustion burners have a smaller opening area or are closed than the vent holes corresponding to burners other than the non-combustion burners.

[0009] According to the present invention, the amount of air flowing into the inlet of the non-combustion burner through the vent, i.e., the amount of air ejected from the non-combustion burner, is reduced or reduced to zero. Therefore, the cooling of the object to be heated by the air ejected from the non-combustion burner can be suppressed. Furthermore, by reducing or reducing the amount of air ejected from the non-combustion burner, the pressure in the space above the non-combustion burner is reduced, and a part of the combustion gas from the burning burner flows into the space above the non-combustion burner. Therefore, the part of the object to be heated located above the non-combustion burner is also heated by the combustion gas, and together with the fact that the cooling of the object to be heated by the air ejected from the non-combustion burner can be suppressed, a decrease in thermal efficiency can be prevented.

[0010] Furthermore, in order to increase the effectiveness of preventing a decrease in thermal efficiency, it is desirable that the opening area of ​​the vent corresponding to the non-combustion burner be less than half the opening area of ​​the smallest vent corresponding to a burner other than the non-combustion burner.

[0011] However, if sound is generated when air passes through a vent corresponding to a non-combustion burner, this sound propagates from the non-combustion burner into the combustion chamber, causing noise. Therefore, in the present invention, it is desirable that the vent corresponding to the non-combustion burner has a short cylindrical burring portion protruding backward from the rim, or is composed of a collection of multiple small holes. If the vent has a burring portion on the rim, the sound is reduced by the rectifying effect of the burring portion, and noise is reduced. Also, if the vent is composed of a collection of multiple small holes, the frequency of the generated sound is increased, making it easier for the sound to attenuate, and noise is reduced.

[0012] The burner has, as a flame port section, a main flame port section which ejects a lean mixture having a fuel concentration lower than that of the theoretical air-fuel ratio, and a sleeve flame port section which is located to the side of the main flame port section and ejects a rich mixture having a fuel concentration higher than that of the lean mixture, and is configured as a rich-lean burner having, as inlets, a mainstream inlet connected to the main flame port section and a sleeve flame inlet connected to the sleeve flame port section, and the standing plate is formed with, as communication ports, a main communication port and a sleeve flame communication port which respectively match the mainstream inlet and the sleeve flame communication port of each burner. In the case where the air adjustment plate is formed with a main vent port and a sleeve fire vent port facing the main communication port and the sleeve fire communication port, respectively, as vents, and the gas manifold is provided with a main nozzle and a sleeve fire nozzle facing the mainstream inlet and sleeve fire communication port of each burner, respectively, as gas nozzles, at least the main vent port of the main vent port and the sleeve fire vent port corresponding to the non-combustion burner may be made smaller in opening area than the main vent port corresponding to the burner other than the non-combustion burner, or may be closed. [Brief description of the drawings]

[0013] [Figure 1] 1 is a cross-sectional side view of a combustion apparatus according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional side view of a portion of the combustion device according to the embodiment where a non-combustion burner is disposed. [Diagram 3] FIG. 2 is an enlarged cross-sectional view of an upper portion of a burner provided in the combustion device of the embodiment. [Figure 4] FIG. 2 is a perspective view of an air conditioning plate provided in the combustion apparatus according to the embodiment. [Diagram 5]FIG. 2 is a perspective view of a portion of a gas manifold provided in the combustion apparatus according to the embodiment, as viewed obliquely from the rear. [Figure 6] FIG. 4 is a perspective view showing a modified example of an air adjustment plate provided in the combustion apparatus of the embodiment. [Figure 7] FIG. 11 is a perspective view showing another modified example of the air adjustment plate provided in the combustion apparatus of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Referring to FIG. 1, the combustion device according to the embodiment of the present invention includes a combustion housing 1. A partition plate 2 is provided in the combustion housing 1 to separate the space in the combustion housing 1 into a combustion chamber 1a and an air supply chamber 1b below the combustion chamber 1a. A plurality of burners 3 are arranged in the horizontal direction (perpendicular to the plane of the drawing in FIG. 1) in the combustion chamber 1a, each of which is longitudinal in the front-rear direction and has a flame port 31 at the upper end (see FIG. 3) and an inlet 32 ​​at the lower front end connected to the flame port 31. A combustion fan (not shown) is connected to the bottom surface of the air supply chamber 1b. Air supplied from the combustion fan to the air supply chamber 1b is supplied to the combustion chamber 1a as secondary air through a number of distribution holes 21 formed in the partition plate 2. A standing plate 22 is provided, which rises from the front end of the partition plate 2 along the lower front ends of the plurality of burners 3. An upper plate portion 22a is bent forward at the upper end of the standing plate 22 to reach the lower end of the front plate portion 11 at the upper front end of the combustion housing 1. An object to be heated, such as a heat exchanger (not shown), is disposed above the combustion chamber 1a.

[0015] As shown in FIG. 3, each burner 3 has a main flame port 31 for ejecting a lean mixture having a fuel concentration lower than the theoretical air-fuel ratio. 1 and a main flame port 31 which ejects a rich mixture having a fuel concentration higher than the theoretical air-fuel ratio. 1 A pair of sleeve flame mouths 31 located on both sides of the 2 ,31 2 The main flame port 31 is a light-and-concentration burner having a light-and-concentration burner. 1 In the inside, a plurality of straightening plates 31 1 a is attached, and further, the main flame mouth part 31 1 On both lateral sides of the sleeve flame mouth portion 31 2The reflux area 31 is located between the 1 Each burner 3 has a main flame port 31 as an inlet 32, which opens so as to face the upright plate 22. 1 Main entrance 32 1 and the main entrance 32 1 The sleeve flame port 31 opens so as to face the upright plate 22 on the upper side of the sleeve. 2 32 Sleeve fire inlet 2 And, the main inlet 32 1 A lean mixture generated by mixing the fuel gas flowing in from the main flame port 31 with the primary air is mixed. 1 The fire inlet 32 2 A relatively small amount of rich mixture generated by mixing the fuel gas flowing in from the sleeve flame mouth 31 with the primary air is 2 This is to ensure that the supply is

[0016] The upright plate 22 has a communication port 23 that matches the inlet 32 ​​of each burner 3, and a main inlet 32 ​​of each burner 3. 1 and sleeve fire inlet 32 2 Main communication ports 23 that correspond to 1 and sleeve fire vent 23 2 A plurality of such vents are formed corresponding to the plurality of burners 3. An air adjustment plate 4 is attached to the front surface of the standing plate 22. As shown in FIG. 4, the air adjustment plate 4 has a vent 41 facing the communication port 23, and a main communication port 23. 1 and sleeve fire vent 23 2 Main ventilation openings 41 facing each other 1 And sleeve fire vent 41 2 A plurality of inlets 32 are formed corresponding to a plurality of burners 3. The internal pressure of the primary air chamber 1c becomes uneven depending on the positional relationship with the connection point of the combustion fan to the air supply chamber 1b. 1 The main vent 41 is provided so that the primary air flows evenly into the 1 The main vent 41 is opened depending on the internal pressure of the primary air chamber 1c where the 1 The size of is changed.

[0017] The combustion apparatus further includes a gas manifold 5 located in front of the upright plate 22 and defining a primary air chamber 1c communicating with the air supply chamber 1b between the upright plate 22 and the gas manifold 5. As shown in FIG. 5, the gas nozzle 51 facing the inlet 32 ​​of each burner 3 is provided on the rear surface of the gas manifold 5. 1 and sleeve fire inlet 32 2 Main nozzle 51 facing each 1 Sleeve fire nozzle 51 2 A plurality of these are provided corresponding to the plurality of burners 3.

[0018] In this embodiment, the number of burners 3 is 18, and as shown in FIG. 1 And sleeve fire vent 41 2 In order to make the combustion device have a relatively low required capacity, three of the burners 3 on one side in the horizontal direction are non-combustion burners 3' (see FIG. 2). 1 and sleeve fire nozzle 51 2 Among them, the one corresponding to the non-combustion burner 3' has a nozzle hole 51 for ejecting fuel gas, as shown in FIG. 2 and FIG. 1 a,51 2 Nozzle 51 without hole having a 1 ´,51 2 ´.

[0019] Here, the main vent 41 of the air conditioning plate 4 1 Main inlet 32 ​​of burner 3 via 1 The amount of air flowing into the sleeve fire vent 41 2 Through the burner 3 sleeve inlet 32 2 The amount of air flowing into the main vent 41 corresponding to the non-combustion burner 3' of the air adjustment plate 4 is much larger than the amount of air flowing into the main vent 41 corresponding to the non-combustion burner 3' of the air adjustment plate 4. 1 ' to the main vent 41 corresponding to the burner 3 other than the non-combustion burner 3' 1 If the non-combustion burner 3' is designed to allow the same amount of air to pass through as the non-combustion burner 3', the large amount of air ejected from the non-combustion burner 3' will hit the object to be heated, cooling the object and reducing the thermal efficiency.

[0020] Therefore, in this embodiment, as shown in FIG. 4, a main vent 41 corresponding to the non-combustion burner 3′ is provided. 1 The opening area of ​​the main vent 41' corresponding to the burner 3 other than the non-combustion burner 3' is 1 The opening area of ​​the non-combustion burner 3' is smaller than that of the main vent 41. This reduces the amount of air ejected from the non-combustion burner 3', making it possible to suppress cooling of the object to be heated by this air. Furthermore, by reducing the amount of air ejected from the non-combustion burner 3', the pressure in the space above the non-combustion burner 3' is reduced, and a portion of the combustion gas from the burning burner 3 flows into the space above the non-combustion burner 3'. Therefore, the portion of the object to be heated located above the non-combustion burner 3' is also heated by the combustion gas, and together with the ability to suppress cooling of the object to be heated by the air ejected from the non-combustion burner 3', it is possible to prevent a decrease in thermal efficiency. Incidentally, in order to enhance the effect of preventing a decrease in thermal efficiency, the main vent 41 corresponding to the non-combustion burner 3' is preferably provided. 1 The opening area of ​​the main vent 41' corresponds to the burner 3 other than the non-combustion burner 3'. 1 It is desirable that the opening area be less than half the area of ​​the smallest one.

[0021] Also, the main vent 41 corresponding to the non-combustion burner 3' 1 If sound is generated when air passes through the main vent 41', this sound will propagate from the non-combustion burner 3' into the combustion chamber 1a, causing noise. 1 2, a short cylindrical burring portion 41 protruding backward from the rim portion is provided. 1 In this embodiment, the burring portion 41 1 The rectification effect of a reduces the sound and reduces noise.

[0022] In this embodiment, the sleeve fire vent 41 corresponding to the non-combustion burner 3′ 2 ' Also, the sleeve fire vent 41 corresponding to the burner 3 other than the non-combustion burner 3' 2 However, as shown in the modified example in FIG. 6, the side fire vent 41 corresponding to the non-combustion burner 3′ is 2 ' denotes a sleeve fire vent 41 corresponding to a burner 3 other than the non-combustion burner 3' 2and the opening area may be the same.

[0023] Furthermore, in the modified example shown in FIG. 6, the main vent 41 corresponding to the non-combustion burner 3′ 1 ´ Multiple small holes 41 1 In this case, the main vent 41 is 1 The frequency of the sound that passes through the hole is 41 1 The effect of the main vent 41 is that the sound is easily attenuated, and the noise level is reduced. 1 The opening area of ​​the hole is 41 1 The total opening area of ​​the main vent 41 corresponding to the burner 3 other than the non-combustion burner 3' is 1 The opening area shall be less than half the opening area of ​​the smallest one of the above.

[0024] As shown in FIG. 7, the main vent 41 corresponding to the non-combustion burner 3′ is 1 ', i.e., blocking the main vent 41 1 It is also possible not to form the non-combustion burner 3'. This further improves the effect of preventing a decrease in thermal efficiency. In this modification, the sleeve fire vent 41 corresponding to the non-combustion burner 3' is not provided. 2 However, by closing this, that is, by closing the main vent 41 corresponding to the non-combustion burner 3', 1 ´And sleeve ventilation hole 41 2 It is also possible to block both.

[0025] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the burner 3 has a main flame port 31 as the flame port 31. 1 and sleeve flame mouth part 31 2However, the burner may be a normal Bunsen burner having one flame nozzle, or a Bunsen burner having a main flame nozzle and a sleeve flame nozzle for flame stabilization to which a part of the mixture toward the main flame nozzle is diverted and supplied. In this case, one inlet is provided in the burner, and one vent is provided in the air adjustment plate corresponding to each burner. The vent corresponding to the non-combustion burner may be made to have a smaller opening area than the vents corresponding to the burners other than the non-combustion burner, or may be closed. [Explanation of symbols]

[0026] 1...combustion box, 1a...combustion chamber, 1b...air supply chamber, 1c...primary air chamber, 2...partition plate, 22...standing plate, 23...communication port, 23 1 …Main communication port, 23 2 ...Sleeve fire communication port, 3...Burner, 3'...Non-combustion burner, 31...Flame port portion, 31 1 ...Main flame opening, 31 2 ...Sleeve flame opening, 32...Inflow port, 32 1 …mainstream inlet, 32 2 ...Sleeve fire inlet, 4...Air conditioning panel, 41...Ventilation hole, 41 1 …Main vent, 41 2 …Sleeve fire vent, 41 1 ´…Main vent for non-combustion burner, 41 1 ´a…Burning section, 41 1 ´b…Small hole, 41 2 ´…Sleeve fire vent for non-combustion burner, 5…Gas manifold, 51…Gas nozzle, 51 1 …Main nozzle, 51 2 … Sleeve fire nozzle, 51 1 a,51 2 a...nozzle hole, 51 1 ´,51 2 ´…Nozzle without holes.

Claims

1. A combustion device comprising: a combustion housing, in which a partition plate is provided that divides the space within the combustion housing into a combustion chamber and an air supply chamber below the combustion chamber, a plurality of burners are arranged side by side in the combustion chamber, each burner being longitudinal in the front-to-rear direction and having a flame port at an upper end and an inlet at a lower front end connected to the flame port, a standing plate is provided that rises from the front end of the partition plate along the lower front ends of the plurality of burners, and a gas manifold is provided that is located in front of the standing plate and defines a primary air chamber communicating with the air supply chamber between the standing plate and the standing plate, A plurality of communication ports that match the inlets of the burners are formed in the standing plate in correspondence with the plurality of burners, and an air adjustment plate is attached to a front surface of the standing plate in which a plurality of vents facing the communication ports are formed in correspondence with the plurality of burners, A plurality of gas nozzles facing the inlets of the burners are provided on the rear surface of the gas manifold in a corresponding manner to the burners; Furthermore, some of the burners among the plurality of burners are non-combustion burners that do not perform combustion, and the gas nozzles corresponding to the non-combustion burners are holeless nozzles that do not have nozzle holes for ejecting fuel gas, A combustion device characterized in that among the vents of the air adjustment plate, the vents corresponding to the non-combustion burners have smaller opening areas or are closed than the vents corresponding to the burners other than the non-combustion burners.

2. 2. The combustion device according to claim 1, wherein the opening area of ​​the vent corresponding to the non-combustion burner is equal to or less than half the opening area of ​​the smallest of the vents corresponding to the burners other than the non-combustion burner.

3. 2. The combustion device according to claim 1, wherein the vent hole corresponding to the non-combustion burner has a short cylindrical burring portion at an edge thereof that protrudes rearward.

4. 2. The combustion device according to claim 1, wherein the vent hole corresponding to the non-combustion burner is composed of a group of a plurality of small holes.

5. 2. A combustion device according to claim 1, wherein the burners have as the flame port sections a main flame port section for ejecting a lean mixture having a fuel concentration lower than that of a theoretical air-fuel ratio, and a sleeve flame port section located laterally of the main flame port section for ejecting a rich mixture having a fuel concentration higher than that of the lean mixture, and the inlets are constituted by a lean-rich burner having a mainstream inlet connected to the main flame port section and a sleeve flame inlet connected to the sleeve flame port section, the communication ports formed on the upright plate include a main communication port and a sleeve flame communication port that respectively match the mainstream inlet and sleeve flame communication port of each burner, the air adjustment plate includes a main vent port and a sleeve flame vent port facing the main communication port and sleeve flame communication port, and the gas manifold is provided with a main nozzle and a sleeve flame nozzle facing the mainstream inlet and sleeve flame communication port of each burner, A combustion device characterized in that at least the main vent of the main vent corresponding to the non-combustion burner and the side fire vent has an opening area smaller than that of the main vent corresponding to a burner other than the non-combustion burner or is closed.

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