Crematory

Abstract

To provide a crematory that can promote the thermal decomposition of dioxins.SOLUTION: A crematory comprises a main burning furnace configured to allow a coffin to be transported therein, a main combustion burner attached to the main burning furnace, a re-burning furnace that is disposed above the main burning furnace and defines a re-burning chamber into which a combustion gas carrying the unburned matter discharged from the main burning furnace flows, and a recombustion burner attached to the re-burning furnace. The recombustion burner includes a multi-burner. The multi-nozzle burner has a plurality of fuel nozzles arranged along a specified direction intersecting with a gas flow direction, which is the flow direction of the combustion gas in the re-burning chamber, and a pair of flame holding plates that faces each other across the plurality of fuel nozzles.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to crematoriums. [Background technology]

[0002] The crematorium is equipped with a main combustion furnace into which the coffin is carried, a main combustion burner attached to the main combustion furnace, a re-burning furnace located above the main combustion furnace, and a re-burning burner attached to the re-burning furnace (see, for example, Patent Document 1). Combustion gases generated in the main combustion furnace pass through the re-burning furnace and are discharged from the crematorium. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-104028 Summary of the Invention [Problem to be solved by the invention]

[0004] In the main combustion furnace, dioxins are generated as unburned matter and flow along with the combustion gas through the main combustion furnace and the re-burning furnace. It is preferable that the dioxins are thermally decomposed in the furnace. However, the above-mentioned Patent Document 1 does not disclose a specific configuration.

[0005] The object of the present disclosure is to provide a crematorium that can promote the thermal decomposition of dioxins. [Means for solving the problem]

[0006] A crematorium according to at least one embodiment of the present disclosure comprises: a main combustion furnace configured to receive the coffin; a main combustion burner attached to the main combustion furnace; a reburning furnace disposed above the main combustion furnace, the reburning furnace defining a reburning chamber into which combustion gases carrying unburned materials discharged from the main combustion furnace flow; a reburning burner attached to the reburning furnace; Equipped with The reburner comprises: a plurality of fuel nozzles arranged along a predetermined direction intersecting a gas flow direction, which is a flow direction of the combustion gas in the reburning chamber; a pair of flame stabilizers facing each other with the plurality of fuel nozzles interposed therebetween; The multi-nozzle burner includes:

[0007] A crematorium according to at least one embodiment of the present disclosure comprises: a main combustion furnace configured to receive the coffin; a main combustion burner attached to the main combustion furnace; a re-burning furnace disposed above the main combustion furnace and configured to receive combustion gases carrying unburned materials discharged from the main combustion furnace; a reburning burner attached to the reburning furnace; Equipped with at least one of the main combustion burner and the afterburner includes a hydrogen burner that burns fuel containing hydrogen gas; The hydrogen burner is a burner nozzle for injecting the fuel; a primary air flow path portion surrounding the burner nozzle when viewed in the axial direction of the burner nozzle and having a primary air outlet formed therein for delivering primary air; a secondary air flow path portion having a secondary air outlet formed therein for delivering secondary air radially outward of the burner nozzle from the primary air outlet; Including, At least one recirculation zone is formed in which, when viewed in the axial direction, an imaginary line extending radially from the center of the burner nozzle does not intersect with the secondary air outlet. [Effects of the Invention]

[0008] According to the present disclosure, a crematorium can be provided that can promote the thermal decomposition of dioxins. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram of a crematorium according to a first embodiment. [Figure 2] FIG. 1 is a schematic diagram of a reburning furnace. [Figure 3] FIG. 1 is a schematic diagram of multiple upper multi-nozzle burners. [Figure 4] FIG. 2 is a schematic detailed view of an upper multi-nozzle burner. [Figure 5] FIG. 1 is a schematic diagram of a crematorium according to a second embodiment. [Figure 6] FIG. 1 is a schematic diagram of a hydrogen burner. [Figure 7] FIG. 10 is a schematic diagram of a crematorium according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, several embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement exactly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions representing shapes such as a square shape or a cylindrical shape not only represent shapes such as a square shape or a cylindrical shape in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. On the other hand, the expressions "comprise," "include," or "have" one element are not exclusive expressions that exclude the presence of other elements. Note that the same components will be denoted by the same reference numerals and the description thereof will be omitted.

[0011] The crematorium 10 of the present disclosure is configured to cremate a coffin 3 carried in from a front room (not shown). For ease of explanation, the upstream side of the direction in which the coffin 3 is carried in is defined as the front side, and the downstream side is defined as the rear side. In this specification, crematoriums 10A, 10B, 10C (10) according to the first, second, and third embodiments are illustrated in this order as specific embodiments of the crematorium 10.

[0012] First Embodiment 1 to 4, a crematorium 10A (10) according to the first embodiment is illustrated. As shown in Fig. 1, the crematorium 10A comprises a main combustion furnace 20 that defines a main combustion chamber Cm for burning the carried-in coffin 3, a main combustion burner 40A (40) attached to the rear wall 25 of the main combustion furnace 20, and a re-burning furnace 30 that defines a re-burning chamber Ch into which the combustion gas discharged from the main combustion furnace 20 flows.

[0013] An opening / closing door 7 made of a fire-resistant and heat-insulating material is disposed on the front wall 24 of the main combustion furnace 20 for opening and closing the carry-in entrance 8. The main combustion burner 40A (40) according to the first embodiment is configured to inject a fuel other than hydrogen gas into the main combustion chamber Cm. The fuel in question is, for example, kerosene or diesel. The re-burning furnace 30 is disposed above the main combustion furnace 20, and the re-burning chamber Ch and the main combustion chamber Cm are connected to each other via a communication passage Cp. The re-burning furnace 30 is formed with an inlet 38 through which the combustion gas flowing through the communication passage Cp flows into the re-burning chamber Ch, and an outlet 39 through which the combustion gas is discharged from the re-burning chamber Ch.

[0014] The flow direction of the combustion gas in the re-burning chamber Ch (hereinafter sometimes referred to as the "gas flow direction") is the forward direction, which corresponds to arrow B in FIG. 1. Arrow B is a horizontal direction. The re-burning furnace 30 includes an upper wall portion 31 and a lower wall portion 32 that faces the upper wall portion 31 across the re-burning chamber Ch. Both the upper wall portion 31 and the lower wall portion 32 extend in the front-to-rear direction, in other words, extend along the gas flow direction.

[0015] As shown in FIG. 2, the crematorium 10A (10) according to the first embodiment further comprises a re-burning burner 50A (50) attached to the re-burning furnace 30. The re-burning burner 50A includes a multi-nozzle burner 60. The multi-nozzle burner 60 illustrated in FIG. 1 includes an upper multi-nozzle burner 65 attached to the upper wall portion 31 and a lower multi-nozzle burner 66 attached to the lower wall portion 32. More specifically, a plurality of upper multi-nozzle burners 65 are arranged along the front-rear direction on the upper wall portion 31, and a plurality of lower multi-nozzle burners 66 are arranged along the front-rear direction on the lower wall portion 32. The upper multi-nozzle burner 65 and the lower multi-nozzle burner 66 are configured to spray fuel containing hydrogen gas in the vertical direction.

[0016] FIG. 3 is a schematic diagram of an upper multi-nozzle burner 65. The figure illustrates three upper multi-nozzle burners 65 arranged along the gas flow direction (arrow B). Each upper multi-nozzle burner 65 has a plurality of fuel nozzles 61 and a pair of flame stabilizers 62 facing each other with the plurality of fuel nozzles 61 sandwiched between them. The fuel nozzles 61 are arranged in a left-right direction that intersects with the gas flow direction. Each of the pair of flame stabilizers 62 extends in the left-right direction. Each flame stabilizer 62 may be composed of a plurality of plate members 62a (more specifically, three plate members 62a) as illustrated in FIG. 3, or may be composed of a single plate member (not shown).

[0017] FIG. 4 is a schematic diagram showing the details of the upper multi-nozzle burner 65. Each fuel nozzle 61 includes a nozzle tip 68 in which a fuel injection hole 69 for injecting fuel is formed. In this example, the fuel injected from the fuel nozzle 61 includes hydrogen gas. However, the present disclosure is not limited to this, and a liquid fuel such as diesel oil may also be injected from the fuel nozzle 61. The pair of flame stabilizers 62 are inclined relative to the vertical direction so that they move farther apart from each other toward the nozzle tip 68 along the axial direction of the fuel nozzle 61. Furthermore, the flame stabilizer 62 may be provided with a through-hole 67. Combustion gas can pass through the through-hole 67.

[0018] Returning to Figure 2, a plurality of lower multi-nozzle burners 66 are arranged on the lower wall portion 32, the same number as the upper multi-nozzle burners 65. The configuration of the lower multi-nozzle burners 66 is the same as that of the upper multi-nozzle burners 65. That is, each lower multi-nozzle burner 66 includes a plurality of fuel nozzles 61 arranged in the left-right direction and a pair of flame stabilizers 62 facing each other with the plurality of fuel nozzles 61 sandwiched between them. To avoid duplication of explanation, a detailed description of the configuration of the lower multi-nozzle burners 66 will be omitted.

[0019] Each of the multiple upper multi-nozzle burners 65 faces one of the multiple lower multi-nozzle burners 66 in the vertical direction. More specifically, between the upper multi-nozzle burner 65 and the lower multi-nozzle burner 66 facing each other, the front-to-rear range in which the upper fuel nozzles 61 are arranged overlaps with at least a part of the front-to-rear range in which the lower fuel nozzles 61 are arranged.

[0020] 1, the multi-nozzle burner 60 is disposed, in the gas flow direction, closer to the inlet 38 side than the center position between the inlet 38 and the outlet 39. The center position is indicated by a two-dot chain line M.

[0021] The cremation process performed by the crematorium 10A shown in Figure 1 is outlined below. After the coffin 3 placed on the fireproof cart is carried into the main combustion chamber Cm, the opening and closing door 7 closes the entrance 8. Then, the main combustion burner 40A is activated, forming a main combustion flame Fm in the main combustion chamber Cm. At the same time, the re-burning burner 50A is activated, forming a flame Fa in the re-burning chamber Ch. More specifically, in each upper multi-nozzle burner 65, multiple flames Fa are formed aligned in the left-right direction, and similarly, in each lower multi-nozzle burner 66, multiple flames Fa are formed aligned in the left-right direction.

[0022] The main combustion region (not shown) formed in the main combustion chamber Cm encompasses the region where the coffin 3 is placed. The combustion gas generated by the combustion of the coffin 3 in the main combustion chamber Cm flows into the re-combustion chamber Ch from the communication passage Cp, carrying with it unburned matter also generated in the main combustion chamber Cm. Here, the unburned matter includes dioxins.

[0023] The formation of multiple flames Fa creates a re-burning zone S in the re-burning chamber Ch. At least a portion of the combustion gas flowing into the re-burning zone S is re-burned (completely combusted) by the flames Fa, making the combustion gas odorless and smokeless. At the same time, at least a portion of the unburned matter flowing in from the inlet 38 undergoes thermal decomposition as it passes through the re-burning zone S. More specifically, dioxins undergo thermal decomposition, producing carbon dioxide, water vapor, and hydrogen chloride gas, which become part of the combustion gas. The combustion gas discharged from the outlet 39 is subjected to cooling treatment by a gas cooler, dust collection treatment by a dust collector, and denitration treatment by a catalytic device, in that order, before being released into the atmosphere from the exhaust tower. Note that the catalytic device may further perform a decomposition process using a catalyst to decompose dioxins remaining in the combustion gas.

[0024] According to the above configuration, each multi-nozzle burner 60 forms multiple flames Fa aligned in the left-right direction. At least one of the multiple fuel nozzles 61 aligned in the left-right direction and the pair of flame stabilizers 62 facing each other across the multiple fuel nozzles 61 functions as a barrier to prevent unburned material from passing between two adjacent flames Fa without being burned. This allows the unburned material to burn at a sufficiently high temperature for a predetermined period of time, accelerating the thermal decomposition of dioxins contained in the unburned material. Furthermore, according to the inventor's knowledge, a combustion temperature of 800°C or higher is required for dioxins to thermally decompose. In this regard, because the multi-nozzle burner 60 uses hydrogen gas as fuel, the temperature of the flame Fa formed in the re-burning chamber Ch is increased, accelerating the thermal decomposition of dioxins.

[0025] Furthermore, since each of the fuel nozzles 61 injects fuel in the vertical direction, the flame Fa extends in the vertical direction in the re-burning region S, which further facilitates combustion of unburned materials in the re-burning chamber Ch, thereby accelerating the thermal decomposition of dioxins.

[0026] Furthermore, when the multi-nozzle burner 60 is configured to include a plurality of upper multi-nozzle burners 65 and a plurality of lower multi-nozzle burners 66, each multi-nozzle burner 60 forms multiple rows of flames Fa aligned in the left-right direction along the gas flow direction, further preventing unburned material from passing through the re-burning chamber Ch without being burned, thereby accelerating the thermal decomposition of dioxins. Note that the multi-nozzle burner 60 does not have to include either the plurality of upper multi-nozzle burners 65 or the plurality of lower multi-nozzle burners 66. Even in this case, the above-mentioned technical advantages can be obtained.

[0027] Furthermore, with a configuration in which multiple upper multi-nozzle burners 65 and multiple lower multi-nozzle burners 66 face each other in the vertical direction, the flame Fa extending downward from the upper multi-nozzle burner 65 and the flame Fa extending upward from the lower multi-nozzle burner 66 face each other in the vertical direction. This forms a re-burning region S that extends continuously in the vertical direction in the re-burning chamber Ch, making it easier for unburned material to burn. This can promote the thermal decomposition of dioxins.

[0028] Furthermore, if the multi-nozzle burner 60 is positioned closer to the inlet 38 than the central position (two-dot chain line M), combustion of unburned material occurs closer to the inlet 38 than to the central position of the re-burning chamber Ch, increasing the time that dioxin flows through the re-burning chamber Ch at a high temperature. This allows dioxin to be more reliably thermally decomposed within the re-burning chamber Ch.

[0029] Second Embodiment The crematorium 10B (10) according to the second embodiment is illustrated with reference to Figures 5 and 6. In both figures, the same components as those in the first embodiment are given the same reference numerals, and their explanations may be omitted or simplified below.

[0030] As shown in Figure 5, the crematorium 10B includes a main combustion burner 40B (40) and a reburning burner 50B (50). Both the main combustion burner 40B and the reburning burner 50B include a hydrogen burner 70 configured to combust a fuel containing hydrogen gas.

[0031] The hydrogen burner 70 of the main combustion burner 40B is attached to the rear wall 25 of the main combustion furnace 20, and the hydrogen burner 70 of the reburning burner 50B is attached to the rear wall 35 of the reburning furnace 30. In the example of FIG. 5, the reburning burner 50B further includes a plurality of multi-nozzle burners 60. The multi-nozzle burners 60 are located downstream of the hydrogen burners 70 of the reburning burner 50B in the gas flow direction. The multi-nozzle burner 60 according to the second embodiment is capable of injecting fuel containing hydrogen gas in the vertical direction, as in the first embodiment. Furthermore, the multi-nozzle burner 60 may be located closer to the outlet 39 in the gas flow direction than the center position (two-dot chain line M) between the inlet 38 and the outlet 39.

[0032] FIG. 6 is a schematic diagram showing details of a hydrogen burner 70. The hydrogen burner 70 includes a burner nozzle 71 for injecting fuel containing hydrogen gas, a primary air flow path section 11 that surrounds the burner nozzle 71 when viewed in the axial direction of the burner nozzle 71, and a secondary air flow path section 22 that is located radially outward of the primary air flow path section 11. A primary air outlet 11a for delivering primary air is formed in the primary air flow path section 11a. A flame stabilizer 16 for imparting swirl force to the primary air is disposed in the primary air outlet 11a. Furthermore, a secondary air outlet 22a for delivering secondary air is formed radially outward of the primary air outlet 11a. In this example, two secondary air flow path sections 22 are disposed, with a secondary air outlet 22a formed above and below the primary air outlet 11a.

[0033] In this embodiment, when viewed in the axial direction of the burner nozzle 71, at least one recirculation region Sr is formed in which an imaginary line L extending radially in a straight line from the center 71C of the burner nozzle 71 does not intersect with the secondary air outlet 22a.

[0034] The operation of the crematorium 10B according to the second embodiment shown in Figure 5 is outlined below. Fuel containing hydrogen gas is injected from the hydrogen burner 70 of the main combustion burner 40B into the main combustion chamber Cm, forming a main combustion flame Fm. This burns the coffin 3. Furthermore, fuel containing hydrogen gas is injected from the hydrogen burner 70 of the re-burning burner 50B into the re-burning chamber Ch, forming a flame Fb. Furthermore, multiple flames Fa are formed by the fuel injected from multiple multi-nozzle burners 60.

[0035] According to the above configuration, using fuel containing hydrogen gas in the crematorium 10C increases the combustion temperature within the crematorium 10C, facilitating the thermal decomposition of dioxins generated by combustion. Furthermore, in the hydrogen burner 70 shown in FIG. 6, primary combustion of fuel and primary air occurs in the primary zone R1, while secondary combustion of unburned fuel remaining after primary combustion and secondary air occurs in the secondary zone R2. Unburned material entrained in the combustion gas accumulates in the gap zone R3 formed between the primary zone R1 and the secondary zone R2. This allows time for dioxins to thermally decompose in either the main combustion chamber Cm or the reburning chamber Ch, facilitating their thermal decomposition. On the other hand, using hydrogen gas as fuel increases the combustion temperature, raising concerns about increased NOx emissions. In this regard, in the hydrogen burner 70, the combustion gases generated by primary and secondary combustion are recirculated via the recirculation zone Sr and returned to the primary zone R1. The primary region R1 is a strong reduction region where the fuel is excessive, so NOx contained in the exhaust gas is reduced. As a result, the crematorium 10C can promote the thermal decomposition of dioxins and suppress NOx emissions.

[0036] Furthermore, if the main combustion burner 40B and the re-burning burner 50B each include a hydrogen burner 70, the combustion temperature in each of the main combustion chamber Cm and the re-burning chamber Ch is increased, which promotes the thermal decomposition of dioxins in the crematorium 10C. Also, the generation of NOx in each of the main combustion chamber Cm and the re-burning chamber Ch can be suppressed.

[0037] <Third embodiment> A crematorium furnace 10C (10) according to the third embodiment is illustrated in Figure 7. In this figure, the same components as those in the first or second embodiment are given the same reference numerals, and their explanations may be omitted or simplified below.

[0038] The crematorium 10C comprises a main combustion burner 40C (40) and a reburning burner 50C (50). The main combustion burner 40C is configured to inject a fuel other than hydrogen gas, and the reburning burner 50C includes a hydrogen burner 70 similar to that of the second embodiment. That is, of the main combustion burner 40C or the reburning burner 50C, only the reburning burner 50C includes a hydrogen burner 70.

[0039] The structure of the main combustion burner 40C may be the structure shown in Fig. 6 or may be another structure. For example, a burner having a double-pipe structure may be applied to the main combustion burner 40C. The inner circular passage of the double pipe may inject fuel other than hydrogen gas, and the outer annular passage may deliver primary air.

[0040] The reburning burner 50C of the crematorium 10C includes a multi-nozzle burner 60. The multi-nozzle burner 60 according to the third embodiment includes a downstream multi-nozzle burner 64 configured to inject fuel toward the downstream side (i.e., the front side) in the gas flow direction. The downstream multi-nozzle burner 64 has a structure similar to that of the upper multi-nozzle burner 65 and the lower multi-nozzle burner 66. Specifically, the downstream multi-nozzle burner 64 has multiple fuel nozzles 61 arranged in the left-right direction and a pair of flame-stabilizing plates 62 facing each other across the multiple fuel nozzles 61. The fuel nozzles 61 of the downstream multi-nozzle burner 64 are configured to inject fuel toward the front, and the pair of flame-stabilizing plates 62 face each other in the vertical direction. In the example shown in FIG. 7, three downstream multi-nozzle burners 64 are arranged vertically. When each downstream multi-nozzle burner 64 is activated, a flame Fa is formed in each of the multiple fuel nozzles 61.

[0041] When the afterburner 50C is configured to include a multi-nozzle burner 60, at least one of the multiple fuel nozzles 61 arranged in the left-right direction or the pair of flame stabilizing plates 62 facing each other across the multiple fuel nozzles 61 functions as a barrier that prevents unburned material from passing between the two adjacent flames Fa on the left and right without being burned. This allows the unburned material to burn at a sufficiently high temperature for a predetermined period of time, accelerating the thermal decomposition of dioxins contained in the unburned material.

[0042] Furthermore, if the configuration is such that only the re-burning burner 50C of the main combustion burner 40C or the re-burning burner 50C includes the hydrogen burner 70, the combustion temperature in the main combustion chamber Cm can be prevented from becoming excessively high, and the shape of the body placed in the coffin 3 can be maintained properly even after combustion.

[0043] Furthermore, if the multi-nozzle burner 60 is configured to include the downstream multi-nozzle burner 64, the downstream multi-nozzle burner 64 can combust the combustion gas burned by the hydrogen burner 70 while sending it downstream (forward), thereby promoting the thermal decomposition of dioxins.

[0044] <Summary> The contents of the above-described embodiments can be understood, for example, as follows.

[0045] 1) A crematorium furnace (10) according to at least one embodiment of the present disclosure comprises: a main combustion furnace (20) configured to receive the coffin (3); a main combustion burner (40) attached to the main combustion furnace; a reburning furnace (30) disposed above the main combustion furnace, defining a reburning chamber (Ch) into which combustion gas carrying unburned matter discharged from the main combustion furnace flows; a reburning burner (50) attached to the reburning furnace; Equipped with The reburner comprises: a plurality of fuel nozzles (61) arranged along a predetermined direction (left-right direction) intersecting a gas flow direction, which is a flow direction of the combustion gas in the re-burning chamber; a pair of flame holders (62) facing each other with the plurality of fuel nozzles in between; The burner includes a multi-nozzle burner (60) having

[0046] According to the configuration 1) above, multiple flames (Fa) aligned along a specified direction are formed in the reburning chamber by the operation of the multi-nozzle burner. At least one of the multiple fuel nozzles aligned in the specified direction or a pair of flame stabilizers facing each other across the multiple fuel nozzles functions as a barrier that prevents unburned material from passing between two adjacent flames without being burned. This allows the unburned material to burn at a sufficiently high temperature for a specified period of time, accelerating the thermal decomposition of dioxins contained in the unburned material.

[0047] 2) In some embodiments, the crematorium described in 1) above, Each of the plurality of fuel nozzles is configured to inject fuel along a direction intersecting the specified direction and the gas flow direction.

[0048] According to the configuration of 2), the reburning region in the reburning chamber, which is created by each of the fuel nozzles forming a flame, extends in a direction intersecting the gas flow direction and the specified direction, which makes it easier for unburned materials to burn in the reburning furnace and promotes the thermal decomposition of dioxins.

[0049] 3) In some embodiments, the crematorium described in 2) above, The gas flow direction is horizontal, The reburning furnace comprises: an upper wall portion (31) extending along the gas flow direction; a lower wall portion (32) facing the upper wall portion across the re-burning chamber; Including, The multi-nozzle burners include at least one of a plurality of upper multi-nozzle burners (65) attached to the upper wall portion and aligned along the gas flow direction, or a plurality of lower multi-nozzle burners (60) attached to the lower wall portion and aligned along the flow direction.

[0050] According to the configuration of 3) above, multiple multi-nozzle burners are arranged along the gas flow direction on at least one of the upper and lower wall sections. Multiple flames aligned in a specified direction are formed in multiple rows along the gas flow direction, which further prevents unburned material from passing through the re-burning chamber without being burned, thereby accelerating the thermal decomposition of dioxins.

[0051] 4) In some embodiments, the crematorium described in 3) above, the multi-nozzle burners include the plurality of upper multi-nozzle burners and the plurality of lower multi-nozzle burners, Each of the plurality of upper multi-nozzle burners faces one of the plurality of lower multi-nozzle burners in the vertical direction.

[0052] According to the configuration of 4) above, the flame extending downward from the upper multi-nozzle burner and the flame extending upward from the lower multi-nozzle burner face each other vertically. This creates a continuous vertical re-burning area in the re-burning chamber, facilitating the combustion of unburned materials. This promotes the thermal decomposition of dioxins.

[0053] 5) In some embodiments, the crematorium according to any one of 1) to 4) above, The reburning furnace comprises: an inlet (38) through which the combustion gas discharged from the main combustion furnace flows into the reburning chamber; an outlet (39) for the combustion gas to be discharged from the reburning chamber; Including, The multi-nozzle burner is disposed closer to the inlet side than the center position (two-dot chain line M) between the inlet and the outlet in the gas flow direction.

[0054] According to the configuration of 5) above, the combustion of unburned materials occurs closer to the inlet than to the center of the re-burning chamber, so that the time during which dioxins flow through the re-burning chamber at high temperatures increases, thereby more reliably decomposing dioxins within the re-burning chamber.

[0055] 6) In some embodiments, the crematorium according to any one of 1) to 5) above, Each of the plurality of fuel nozzles is configured to inject a fuel including hydrogen gas.

[0056] According to the inventors' findings, in order for dioxins to be thermally decomposed, the combustion temperature must be 800°C or higher. In this regard, in the configuration of 6) above, the use of hydrogen gas increases the flame temperature, accelerating the thermal decomposition of dioxins.

[0057] 7) The crematorium furnace (10) according to at least one embodiment of the present disclosure comprises: a main combustion furnace (20) configured to receive the coffin (3); a main combustion burner (40) attached to the main combustion furnace; a re-burning furnace (30) disposed above the main combustion furnace and configured to receive combustion gases carrying unburned materials discharged from the main combustion furnace; a reburning burner (50) attached to the reburning furnace; Equipped with At least one of the main combustion burner and the afterburner includes a hydrogen burner (70) that burns a fuel containing hydrogen gas; The hydrogen burner is a burner nozzle (71) for injecting the fuel; a primary air flow path portion (11) surrounding the burner nozzle when viewed in the axial direction of the burner nozzle and having a primary air outlet (11a) formed therein for delivering primary air; a secondary air flow path portion (22) in which a secondary air outlet (22a) for delivering secondary air is formed on the outer side of the primary air outlet in the radial direction of the burner nozzle; Including, When viewed in the axial direction, at least one recirculation region (Sr) is formed in which an imaginary line (L) extending radially from the center of the burner nozzle does not intersect with the secondary air outlet.

[0058] According to the configuration of 7) above, using a fuel containing hydrogen gas in a crematorium increases the combustion temperature within the crematorium, facilitating the thermal decomposition of dioxins generated by combustion. Furthermore, in a hydrogen burner, primary combustion of fuel and primary air occurs in the primary zone (R1), followed by secondary combustion of unburned fuel remaining after primary combustion with secondary air in the secondary zone (R2). Unburned material entrained in the combustion gas accumulates in the gap zone (R3) formed between the primary and secondary zones. This allows time for dioxins to thermally decompose, facilitating their thermal decomposition. On the other hand, the use of hydrogen gas as fuel raises the combustion temperature, raising concerns about increased NOx emissions. In this regard, in a hydrogen burner, the combustion gases generated by primary and secondary combustion return to the primary zone via the recirculation zone. Because the primary zone is a strong reduction zone with excess fuel, NOx contained in the exhaust gas is reduced. As a result, a crematorium can be realized that can promote the thermal decomposition of dioxins while suppressing NOx emissions.

[0059] 8) In some embodiments, the crematorium according to 7) above, Of the main combustion burner or the afterburner, only the afterburner includes the hydrogen burner.

[0060] According to the configuration of 8) above, the combustion temperature in the main combustion chamber can be prevented from becoming excessively high, and the shape of the body placed in the coffin can be maintained properly even after combustion.

[0061] 9) In some embodiments, the crematorium according to 7) above, Each of the main combustion burner and the afterburner includes the hydrogen burner.

[0062] According to the above configuration 9), the combustion temperature in each of the main combustion chamber and the re-burning chamber is increased, which promotes the thermal decomposition of dioxins and also suppresses the generation of NOx in each of the main combustion chamber and the re-burning chamber.

[0063] 10) In some embodiments, the crematorium according to any one of 7) to 9) above, The reburner comprises: the hydrogen burner; a multi-nozzle burner (60) disposed within a reburning chamber defined by the reburning furnace; The multi-nozzle burner is a plurality of fuel nozzles (61) arranged along a predetermined direction (left-right direction) intersecting a gas flow direction, which is a flow direction of the combustion gas in the re-burning chamber; a pair of flame holders (62) facing each other with each of the plurality of fuel nozzles in between; It has.

[0064] The configuration 10) above provides the same technical advantages as the configuration 1).

[0065] 11) In some embodiments, the crematorium according to 10) above, the multi-nozzle burner is located downstream of the hydrogen burner attached to the reburning furnace in the gas flow direction, Each of the plurality of fuel nozzles is configured to inject the fuel toward the downstream side.

[0066] According to the configuration of 11) above, the multi-nozzle burner can combust the combustion gas burned by the hydrogen burner while sending it downstream, thereby accelerating the thermal decomposition of dioxins. [Explanation of symbols]

[0067] 3: Coffin 7: Opening and closing door 8: Loading entrance 10A,10B,10C(10): Cremation furnace 11: Primary air flow path 11a: Primary air outlet 16:Flame holder 20: Main combustion furnace 22: Secondary air flow path 22a: Secondary air outlet 24: Front wall 25: Rear wall 30: Reburning furnace 31: Upper wall part 32: Lower wall part 35: Rear wall 38:Inlet 39: Outlet 40A, 40B, 40C (40): Main combustion burner 50A, 50B, 50C (50): Re-burning burner 60: Multi-nozzle burner 61: Fuel nozzle 62: Flame holding plate 62a: Plate member 64: Downstream multi-nozzle burner 65: Upper multi-nozzle burner 66: Lower multi-nozzle burner 67:Through hole 68: Nozzle tip 69:Fuel injection hole 70: Hydrogen burner 71: Burner nozzle 71C: Center B: Arrow Ch: Reburning chamber Cm: Main combustion chamber Cp: ​​Communication path Fa, Fb: flame Fm: Main combustion flame L: Virtual line M: Two-dot chain line R1: Primary area R2: Secondary area R3: Gap area S: Reburn area Sr: Recirculation area

Claims

1. a main combustion furnace configured to receive the coffin; a main combustion burner attached to the main combustion furnace; a reburning furnace disposed above the main combustion furnace, the reburning furnace defining a reburning chamber into which combustion gases carrying unburned materials discharged from the main combustion furnace flow; a reburning burner attached to the reburning furnace; Equipped with The reburner comprises: a plurality of fuel nozzles arranged along a predetermined direction intersecting a gas flow direction, which is a flow direction of the combustion gas in the reburning chamber; a pair of flame stabilizers facing each other with the plurality of fuel nozzles interposed therebetween; The multi-nozzle burner includes Crematorium.

2. Each of the plurality of fuel nozzles is configured to inject fuel along a direction intersecting the specified direction and the gas flow direction.

2. The cremation furnace of claim 1.

3. The gas flow direction is horizontal, The reburning furnace comprises: an upper wall portion extending along the gas flow direction; a lower wall portion facing the upper wall portion across the re-burning chamber; Including, The multi-nozzle burners include at least one of a plurality of upper multi-nozzle burners attached to the upper wall portion and aligned along the gas flow direction, or a plurality of lower multi-nozzle burners attached to the lower wall portion and aligned along the gas flow direction.

3. The cremation furnace of claim 2.

4. the multi-nozzle burners include the plurality of upper multi-nozzle burners and the plurality of lower multi-nozzle burners, Each of the plurality of upper multi-nozzle burners faces one of the plurality of lower multi-nozzle burners in the up-down direction.

4. The cremation furnace of claim 3.

5. The reburning furnace comprises: an inlet through which the combustion gas discharged from the main combustion furnace flows into the re-burning chamber; an outlet for discharging the combustion gas from the reburning chamber; Including, The multi-nozzle burner is disposed closer to the inlet than a center position between the inlet and the outlet in the gas flow direction. A crematorium furnace according to any one of claims 1 to 3.

6. Each of the plurality of fuel nozzles is configured to inject a fuel including hydrogen gas. A crematorium furnace according to any one of claims 1 to 3.

7. a main combustion furnace configured to receive the coffin; a main combustion burner attached to the main combustion furnace; a re-burning furnace disposed above the main combustion furnace and configured to receive combustion gases carrying unburned materials discharged from the main combustion furnace; a reburning burner attached to the reburning furnace; Equipped with at least one of the main combustion burner and the afterburner includes a hydrogen burner that burns fuel containing hydrogen gas; The hydrogen burner is a burner nozzle for injecting the fuel; a primary air flow path portion surrounding the burner nozzle when viewed in the axial direction of the burner nozzle and having a primary air outlet formed therein for delivering primary air; a secondary air flow path portion having a secondary air outlet formed therein for delivering secondary air radially outward of the burner nozzle from the primary air outlet; Including, When viewed in the axial direction, at least one recirculation region is formed such that an imaginary line extending radially from the center of the burner nozzle does not intersect with the secondary air outlet. Crematorium.

8. Only the reburning burner of the main combustion burner or the reburning burner includes the hydrogen burner.

8. The cremation furnace of claim 7.

9. Each of the main combustion burner and the afterburner includes the hydrogen burner.

8. The cremation furnace of claim 7.

10. The reburner comprises: the hydrogen burner; a multi-nozzle burner disposed within a reburning chamber defined by the reburning furnace; The multi-nozzle burner is a plurality of fuel nozzles arranged along a predetermined direction intersecting a gas flow direction, which is a flow direction of the combustion gas in the reburning chamber; a pair of flame holders facing each other with each of the plurality of fuel nozzles interposed therebetween; have A crematorium furnace according to any one of claims 7 to 9.

11. the multi-nozzle burner is located downstream of the hydrogen burner attached to the reburning furnace in the gas flow direction, Each of the plurality of fuel nozzles is configured to inject the fuel toward the downstream side.

11. The cremation furnace of claim 10.

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