JP2002235911A - Cremating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cremating furnace which suppresses the reproduction of dioxines contained in a combustion exhaust gas and prevents the dioxines from exhausting in the air without increasing the combustion exhaust gas quantity during cooling. SOLUTION: The cremating furnace having an afterburning chamber 7 in an upper part of a main combustion chamber 6 comprises a cooling chamber 12 disposed near in an upper part of the afterburning chamber 7, allowing a combustion exhaust gas produced in this chamber 7 to be sent into the chamber 12, and a sprayer 15 with a nozzle 16 for spraying over and quenching the combustion exhaust gas sent into the cooling chamber 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cremation furnace having a main combustion chamber and a reburn chamber in a furnace.

[0002]

2. Description of the Related Art This type of crematorium generally reburns combustion exhaust gas generated in a main combustion chamber in a reburn chamber and sublimates harmful substances represented by dioxin contained in the combustion exhaust gas. Furthermore, it is discharged to the outside through a dustproof filter, and in this case, the dustproof filter often does not have heat resistance enough to withstand the temperature of the combustion exhaust gas, and further has a purpose of preventing regeneration of the sublimed dioxin. From
An air-cooled cooler that feeds outside air to combustion exhaust gas is provided between the main combustion chamber and the reburn chamber and the dust filter.

[0003]

However, the conventional cremation furnace has a configuration in which the outside air is directly fed from a cooler to be used, and furthermore, since there is an installation distance between the furnace body and the cooler, the combustion exhaust gas is naturally cooled. With the increase in the time period for which dioxin is generated, the time period in which the dioxin is generated in the temperature range is prolonged, which causes a problem that dioxin is regenerated. In addition, since the mixture is cooled to a temperature at which dioxin is regenerated by mixing the outside air sent from the cooler and the combustion exhaust gas from the furnace body, the amount of the combustion exhaust gas after cooling is greatly increased and the amount is large. Emission of harmful gas into the atmosphere, the size of each device must be increased in order to improve the processing capacity of equipment such as dust filters, thereby increasing installation space, construction costs, and operating costs. There was also a problem.

[0004] In view of the above problems, the present invention can prevent the regeneration of dioxin contained in flue gas and can prevent the emission of dioxin into the atmosphere without increasing the amount of flue gas during cooling. To provide a cremation furnace.

[0005]

According to one aspect of the present invention, there is provided a cremation furnace having a reburning chamber above a main combustion chamber, wherein the reburning chamber includes a reburning chamber. At the close position, there is provided a cooling chamber capable of feeding combustion exhaust gas generated in the reburning chamber, and a spray device with a nozzle capable of spraying and rapidly cooling the combustion exhaust gas sent into the cooling chamber. It is characterized by having.

Here, the cooling chamber may have any structure as long as the combustion exhaust gas sent from the reburning chamber can be sent smoothly. For example, in the furnace, the cooling chamber sends the combustion exhaust gas together with the main combustion chamber and the reburning chamber. May be formed integrally with each other via a flue, or may be formed separately from the furnace body. Further, the cooling chamber is located in the upper proximity position of the reburning chamber as long as the space in the reburning chamber and the space in the cooling chamber are vertically close to each other. The cooling chamber may be integrally formed with a partition having a flue above and below each other, or may be separately formed in an upper part of the reburning chamber, that is, in an upper part of a ceiling wall of a furnace body. It may be formed on the body, and its form is not particularly limited. Further, the configuration of the spray device with a nozzle may be a configuration in which the operation is automatically controlled by a temperature sensor, or the operator may manually operate the spray device as appropriate.

[0007] The invention according to claim 2 of the present invention provides:
A cremation furnace having a reburning chamber above the main combustion chamber, and a cooling chamber capable of feeding combustion exhaust gas generated in the reburning chamber is provided at a position near the upper part of the reburning chamber,
The cooling chamber is provided with a heat exchange device capable of rapidly cooling the sent combustion exhaust gas.

[0008] Here, the heat exchange device may be any device capable of instantaneously quenching without increasing the amount of combustion exhaust gas sent into the cooling chamber and without leaving time for natural cooling. One that passes outside air through a pipe provided in a cooling chamber, and takes heat from combustion exhaust gas through the pipe,
Alternatively, there may be mentioned a structure in which water is similarly taken from the combustion exhaust gas by passing water through the pipe.

With this configuration, the combustion exhaust gas sent from the reburning chamber into the cooling chamber is instantaneously quenched in the cooling chamber by mist from the spray device or heat absorption by the heat exchange device. Since the amount of flue gas exhausted from the furnace does not increase significantly and the time for the flue gas to cool naturally is negligible, regeneration of dioxin can be drastically suppressed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a crematorium of the present invention will be described with reference to the drawings. A first embodiment of the cremation furnace of the present invention will be described with reference to FIG. 1. First, a furnace body 1 is provided with an opening / closing door 4 at an entrance 3 opening in a front wall 2. The interior is vertically divided by a partition wall 5, and the lower space divided into the main combustion chamber 6, the upper space is defined as a reburning chamber 7, and the main combustion chamber 6 communicates with the reburning chamber 7. A first flue 8 is provided behind the partition wall 5, a main burner 9 is provided on a lower portion of a rear wall of the first flue 8, and a reburn burner 10 is provided on an upper portion. Further, a cooling chamber 12 communicating with the duct pipe 11 is provided in an upper part of the furnace body 1 so as to be integrated with the furnace body 1. The cooling chamber 12 is provided with a spray device 15 having a nozzle 16 capable of spraying mist over the entire inside of the cooling chamber 12 on the front wall 14 side.

The cremation furnace of the present invention aims at preventing the regeneration of dioxin contained in the flue gas without greatly increasing the amount of flue gas generated in the reburning chamber 7 during rapid cooling. The dioxin is regenerated within a temperature range of 200 ° C. to 750 ° C., and aims at minimizing the time for which the flue gas is kept within the temperature range.

Hereinafter, the configuration of the cooling chamber 12 and the spraying device 15 which are the main parts of this embodiment will be mainly described with reference to FIG. First, the structure of the cooling chamber 12 will be described. At the front side of the ceiling wall 2 constituting the reburning chamber 7, a second flue 13 for sending out the combustion exhaust gas generated in the reburning chamber 7 into the cooling chamber 12 is formed. A second smoke port 17 penetrates left and right in a partition wall 25 extending vertically and further separating the second flue 13 and the cooling chamber 12 from each other. And the second flue 13
A spraying device 15 with a nozzle 16 is attached to the front wall 14 of the cooling device 12. The spraying device 15 further has a spray port of the nozzle 16 directed into the cooling chamber 12 through the second smoke port 17. Has been installed.

[0013] The spraying device 15 applies the spraying device 1 in the cooling chamber 12 to the combustion exhaust gas sent from the reburning chamber 7 through the second flue 13 into the cooling chamber 12.
5 is a structure in which water is sprayed from the injection port of the nozzle 16 in a mist state. In addition, a first temperature sensor 19 is provided in a second smoke outlet 18 provided in the rear of the cooling chamber 12, and a second temperature sensor 20 is provided in the second flue 13 as well. , The reburning burner 1 until the combustion exhaust gas becomes 750 ° C. or more by the control of the first temperature sensor 19.
0 continues to be activated and the second temperature sensor 20
Thus, the mist is controlled to continue spraying from the nozzle 16 of the spraying device 15 until the temperature of the combustion exhaust gas passing through the second flue 13 is cooled to 200 ° C. by the spraying device 15. The water used for the quenching of the flue gas evaporates after depriving the heat in the cooling chamber 12, but when discharged to the outside of the cooling chamber 12, the amount of the flue gas slightly increases. is there.

As described above, the cooling chamber 12 and the spray device 15
Is disposed at a position close to the upper part of the furnace body 1, it becomes possible to rapidly cool the flue gas that has passed through the reburning chamber 7 and the second flue 13 instantaneously without leaving time for natural cooling.
While maintaining a temperature of 750 ° C. or more, which is a temperature range in which dioxin cannot be regenerated, in the reburning chamber 7, the combustion exhaust gas is rapidly cooled to 200 ° C. or less, which is also a temperature range in which dioxin cannot be regenerated. It is possible to prevent the regeneration of dioxin contained in the exhaust gas. Moreover, since the combustion effluent is quenched by the water sprayed from the nozzle 16 of the spray device 15 in the present cremation furnace, the amount of the combustion exhaust gas sent from the inside of the reburning chamber 7 does not increase. It is possible to reduce the amount of combustion exhaust gas released into the atmosphere and reduce the load on each device such as a dust collector (not shown) used for post-processing.

As shown in FIG. 3, a pipe 2 having an inlet 27 and an outlet 28 in the second flue 13 outside the furnace body 1 is provided.
6, the pipe 26 may be provided with a blower (not shown) at the inlet 27, and the outlet 28 may be provided with a blower pipe connected to the main burner 9 and the reburner 10, respectively. When formed in this manner, the air for combustion to each of the burners 9 and 10 is in a warmed state, and it is possible to save energy when operating the cremation furnace. However, in this case, by installing the pipe 26, the pipe 26 is installed in the second flue 13 so that the temperature of the combustion exhaust gas sent from the reburning chamber 7 is not cooled below 750 ° C. which is the upper limit of the dioxin regeneration temperature. It is necessary to set the size of the exhaust gas or the temperature of the combustion exhaust gas sent from the reburning chamber 7 to a higher temperature.

FIGS. 4 and 5 show another embodiment of the present invention. In this cremation furnace, a pipe 21 which is bent in a concave shape is installed inside a cooling chamber 12, and the inside of the pipe 21 is provided. By sending in outside air, heat exchange between the combustion exhaust gas in the cooling chamber 12 and the outside air in the pipe 21 via the peripheral wall of the pipe 21 is performed. 4 when the pipe 21 is installed in the cooling chamber 12.
The outside air inlet 22 and the outlet 23 are provided outside the cooling chamber 12 as described above, and the inlet 22 communicates with the blower 24, and the outside air sent from the blower 24 It is discharged from the outlet 23 to the outside of the furnace body 1 through a pipe 21. Further, the warmed outside air discharged from the outlet 23 after the heat exchange is used as combustion air for the main combustion burner 9 and the reburn burner 10, and although not shown, each burner 9 , 10 sequentially.

[0017]

According to the present invention, the combustion exhaust gas having a temperature higher than the dioxin regeneration temperature in the reburning chamber can be rapidly cooled so as to be instantly lower than the dioxin regeneration temperature without increasing the combustion exhaust gas amount. , Reducing the burden on various devices such as dusters used for post-processing of the crematory furnace, and dramatically reducing the amount of harmful dioxins emitted into the atmosphere when using the crematory furnace. Become.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a cremation furnace of the present invention.

FIG. 2 is a longitudinal sectional explanatory view showing a main part of FIG. 1;

FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 5 is an explanatory view in vertical section showing a main part of FIG. 4;

[Explanation of symbols]

 6 Main Combustion Chamber 7 Reburn Chamber 12 Cooling Chamber 15 Sprayer 16 Nozzle 21 Pipe (Heat Exchanger)

Claims (2)

[Claims] 1. A cremation furnace having a reburning chamber (7) above a main combustion chamber (6), wherein the cremation furnace is generated in the reburning chamber (7) at a position close to the upper part of the reburning chamber (7). A cooling device (1) having a cooling chamber (12) capable of feeding combustion exhaust gas is provided, and a spray device (1) having a nozzle (16) capable of spraying and rapidly cooling the combustion exhaust gas sent into the cooling chamber (12).
A cremation furnace characterized by having 5). 2. A cremation furnace provided with a reburning chamber (7) above a main combustion chamber (6), wherein the cremation furnace is located near the upper part of the reburning chamber (7) and generated in the reburning chamber (7). A cooling chamber (12) capable of feeding the combustion exhaust gas is provided, and a heat exchange device (21) capable of rapidly cooling the sent combustion exhaust gas is provided in the cooling chamber (12). Crematory furnace.