JP3027001B2 - Hazardous gas combustion treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention incinerates furnaces of the type that generate harmful gases that can cause pollution by combustion, such as dead bodies, dead animals, or similar waste. The present invention relates to a harmful gas combustion treatment device that includes a cremation furnace, an incinerator, and other industrial furnaces, and that detoxifies the generated harmful gas by burning.

[Conventional technology]

This type of apparatus is generally performed in a furnace also called a reburning furnace, in which harmful gas generated in the main combustion chamber is guided to a separate reburning chamber, and a flame radiated from a burner into the reburning chamber. It oxidizes and decomposes unburned gas, soot, dust, odor and the like contained in harmful gas and releases it to the atmosphere as harmless gas.

By the way, as basic technology for making harmless gas, three points of the indoor temperature, residence time and oxygen concentration in the reburning chamber are important factors.
C., residence time is 0.8 sec, and oxygen concentration is 5%, which is appropriate. However, if the above numerical values are satisfied, the harmful gas is not always converted to a harmless gas, and various ingenuity have been conventionally devised for more effective treatment.

As one example, as shown in FIGS. 11 and 12, while the harmful gas in the reburning chamber 14 flows from the inlet to the outlet, the grate 15 is installed so as to face the burner. Things are known. The grate 15 is made of firebricks or refractory (castable) and has many through holes.
The effect is that the grate 15 is heated by the flame radiated by the burner, and the soot and dust adhering to it are incinerated and the gas passes through the through hole of the grate. This stirs the gas, thereby promoting contact with the heated surface of the grate, thereby achieving detoxification.

[Problems to be solved by the invention]

However, cremation furnaces and the like are also called batch furnaces, that is, heating is not performed continuously all the time, but in the case of a furnace that repeatedly uses cooling and heating in the main combustion chamber many times In particular, however, even in furnaces used continuously, not only in batch furnaces, the above-described grate has the following disadvantages.

A) It is necessary to raise the temperature of the grate before starting the main combustion chamber. Although it depends on the size of the furnace, a typical cremation furnace requires 5 to 10 minutes, which requires a preparatory step and increases the fuel cost during that time.

B) Since the grate is made of refractory bricks or irregular-shaped refractories as described above, the opening area of the through hole becomes larger than a size suitable for agitating gas in construction, and therefore, the fire There is a drawback that a part of the harmful gas passes through as it is without contacting the heating surface of the grid.

C) If the through-hole is made small so that the opening area of the through-hole becomes an appropriate size for effective gas contact, the passage area ratio to the entire area of the grate becomes extremely small. On the contrary, the flow resistance of the gas is increased, and the reburning treatment is reduced.

D) Particularly for the batch type, an operation of projecting a flame onto a grate at room temperature and rapidly heating the same is repeatedly performed.
Since the material is repeatedly subjected to thermal expansion and contraction, there is a drawback that the material has a high degree of fatigue and causes damage such as cracking in a short period of time.

E) There is a disadvantage that the internal volume of the reburning chamber is increased in order to compensate for the above disadvantages.

The present invention has been developed with the object of solving the above problems and having the effect of detoxifying harmful gases more quickly than at the beginning of combustion, and increasing the efficiency of reburning.

[Means for solving the problem]

The gist of the solution according to the present invention is to provide a heating filter having a heat-resistant fine ceramic fiber having a through-hole through which a gas passes, in a reburning processing chamber.

In particular, it is preferable that the heating filter is formed of a rope made of fine ceramic fiber in a binding layer having a goodwill shape.

Further, another means according to the present invention is to form a noren with a fine ceramics fiber rope and pass the gas in a high heat atmosphere which is almost equal to the heat at the time of combustion in a flue for discharging harmful gas generated by combustion. A heating filter having a through hole is installed such that the longitudinal direction of the rope is the same as the gas flow direction.

[Action]

Since the specific gravity of the fine ceramic fiber is so light that it floats on the water, the temperature rises rapidly, the gap through which the gas passes can be made small, and it can be provided innumerably. It will improve.

〔Example〕

The harmful gas combustion treatment device according to the present invention will be specifically described in the case of a cremation furnace. As shown in FIGS. 1 and 2, reference numeral 1 denotes a main combustion chamber for directly cremating a hearse with a main burner 2,
Reference numeral 3 denotes a processing chamber provided with a sub-burner 4 for processing harmful gases generated in the main combustion chamber 1. In the case shown in FIG. 3
In the case shown in FIG. 2, the harmful gas is guided from the rear side of the main combustion chamber 1 through the flue 5 to the rear side of the processing chamber 3. is there. The processing chamber 3 and the heating filter 6 provided in the chamber.
This constitutes a harmful gas combustion treatment apparatus according to the present invention.

The heating filter 6 is provided so as to face the sub-burner 4, and its structure is, as shown in FIGS. 6 and 7,
A rope 9 knitted with fine ceramic fibers is wound from one end of the upper and lower support members 7, 8 to the other end thereof, between the upper and lower support members 7, 8 formed of carborundum or heat-resistant steel square material,
The heating filter 6 is provided with a slit-shaped through-hole 10 between the ropes 9 and blocks the gas flow at one or several places between the gas inlet and the outlet in the processing chamber 3. It is installed in a state. As one example of the installation, a window hole 11 for narrowing the gas flow area with a refractory brick or the like is provided on the inner peripheral edge of the processing chamber 3, and the heating filter 6 is fitted while the window hole 11 is formed. It is provided.

FIGS. 8 and 9 show another embodiment, in which the heating filter 6 is formed in a mesh form with a rope 9 woven from fine ceramic fibers in the same manner as described above. If the cross section of the chamber 3 is circular, a number of through holes 13 are opened in a support frame 12 formed by looping a cross section of heat-resistant steel having a T-shaped cross section, and the rope 9 is sequentially passed through each through hole 13. It is formed in a net shape and fixed at one or several places in the processing chamber. The processing chamber 3 is not limited to a circular shape as shown in the figure.
If the cross-section is square, a square heating filter 6 is provided.

FIG. 10 shows still another embodiment, in which a heating filter 6 is provided.
In the same manner as described above, a rope 9 knitted with fine ceramics fibers is formed in a noren pattern, and a large number of the ropes 9 are hung on a support member 14 formed of a carborundum or a heat-resistant steel square bar. Things. In this case also the seventh
Like the example shown in the figure, it is suspended in the window hole 11 and is also disposed at one or several places.

Incidentally, the material of the above-mentioned fine ceramics may be, for example, one formed in a rope with alumina fiber, silica fiber, alumina-silica fiber, silicon carbide fiber, silicon nitride fiber, or the like, or one formed in a belt shape, It is preferable to use those having a heat resistance of 1200 to 1600 ° C., a specific gravity of 0.2 to 0.5 and a rope having a diameter of 6 to 20 mm.

Next, in the cremation furnace according to the example shown in FIG. 3, a flue 5 is provided vertically upright from the front side of the main combustion chamber 1, and a processing chamber 3 having a sub-burner 4 in the middle of the flue 5 from the lateral direction. Concatenate,
The chimney 17 is connected to the upper part of the chimney 5. The noren-shaped heating filter 6 is suspended between the main combustion chamber 1 and the processing chamber 3 in the flue 5 of the cremation furnace, and the portion where the heating filter 6 is suspended is: In an atmosphere in which heat substantially equal to the combustion temperature from the main combustion chamber 1 is maintained, by suspending the heating filter 6, the longitudinal direction of the flammable gas flows from the main combustion chamber 1 and flows into the flue 5. It is installed in the same direction as the flow. However, as shown in FIG. 4, the heating filter 6 in the shape of a noren may be installed at a position past the processing chamber 3 of the flue 5 in the same manner as described above, and this portion is also in an atmosphere that maintains high heat.

Further, the example shown in FIG. 5 is an incinerator in which a flue 5 is connected to the upper surface of the main combustion chamber 1, and the inside of the flue 5 is substantially equal to or higher than the combustion temperature in the main combustion chamber 1. In an atmosphere where heat is kept close to the above, and this flue 5 is formed as a processing chamber 3,
A heating filter 6 in the shape of a noren is suspended in the processing chamber 3 as in the above-described example.

〔The invention's effect〕

The harmful gas combustion processing device according to the present invention has the following effects.

A) The heating filter is made of fine ceramics fibers and is lightweight, so that it is heated by a flame or the heat of combustion from the main combustion chamber and rapidly rises in temperature. At the same time, the heating filter can be heated and started, and energy saving can be promoted. Moreover, it is durable and is used for a long period of time without suffering damage such as breakage or breakage even if rapid cooling and rapid heating are repeated.

B) The heating filter is made of fine ceramics fibers, and the number of through holes through which the gas passes can be made small and innumerable. Therefore, the degree of contact with the heating filter is increased, and the oxidative decomposition of the harmful gas is rapidly performed. . Further, soot and dust easily come into contact with the heating filter, and the degree of harmfulness is further increased.

C) As described above, since the harmful gas combustion process is performed quickly, the volume of the processing chamber can be greatly reduced, and the residence time of the gas can be shortened.

D) Since the heating filter is made of fine ceramics fibers, it also has a noise reduction effect of greatly reducing combustion noise.

[Brief description of the drawings]

FIGS. 1, 2, 3, and 4 are cross-sectional views showing various cremation furnaces provided with the harmful gas combustion treatment device according to the present invention, and FIG. 5 is provided with the harmful gas combustion treatment device according to the present invention. FIG. 6 is a perspective view showing an example of a heating filter, FIG. 7 is a front view of the same, FIG. 8 is a sectional view showing a supporting frame of another example of a heating filter, and FIG. Front view showing a heating filter using the support frame shown in FIG. 8,
FIG. 10 is a sectional view showing a heating filter according to still another example, FIG. 11 is a longitudinal sectional view showing a conventional harmful gas combustion treatment apparatus, and FIG. 12 is a sectional view taken along line AA of FIG. It is. 1: Main combustion chamber, 3: Processing chamber 6: Heat filter, 9: Rope, 10: Through hole

Claims (1)

(57) [Claims] The gas passes through a high-temperature atmosphere, which is almost equal to the heat of combustion in a flue (5) for discharging harmful gas generated by combustion, formed of fine ceramic fiber rope in a noren form. A harmful gas combustion treatment device characterized in that a heating filter (6) having a through hole (10) is installed so that the longitudinal direction of the rope is in the same direction as the gas flow direction.