JP3509366B2 - Cooling structure of dust supply device of incinerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust supply apparatus for supplying an object to be treated to an incinerator, and more specifically, a supply chute for supplying the object to be treated into the furnace is surrounded by the supply chute for cooling. The present invention relates to a cooling structure of an incinerator dust supply device provided with an air cooling jacket.

[0002]

2. Description of the Related Art Conventionally, in an incinerator, in order to prevent the supply chute of a dust supply device from being heated by the heat in the furnace and suffering heat damage, an air cooling jacket surrounding the supply chute is provided, A cooling structure for air cooling the supply chute is adopted. The supply chute is generally made of heat resistant cast steel. In the air-cooling jacket of the dust supply device, the purpose is only to protect the supply chute from overheating, and the cooled air is directly discharged to the outside through the discharge duct.

[0003]

In the conventional air cooling structure of the dust supply device, the air supply device for supplying the cooling air is required, and the discharged air after cooling is discharged as it is. The amount of heat has not been recovered. further,
It is difficult for the cooling jacket to surround the tip of the feed chute, and therefore the feed chute may have a relatively high cooling temperature in order to avoid cooling the waste fed into the furnace from the feed chute, It must be made of a heat-resistant material, and since the tip is exposed to the atmosphere in the furnace, corrosion resistance is also required. Therefore, the supply chute needs to be made of a heat-resistant material having corrosion resistance, and is generally made of heat-resistant cast steel, which is inevitably expensive. Therefore, an object of the present invention is to solve the above-mentioned problems, without providing an air supply device for cooling air, the tip portion of the supply chute can be protected from corrosion, and,
This is to provide a cooling structure for an incinerator that can reliably cool.

[0004]

[Effects of feature configuration]

Therefore, according to the above-mentioned characteristic configuration, even if the air cooling jacket is not provided up to the tip of the supply chute that is difficult to surround, the air blown from the air cooling jacket is introduced into the furnace along the supply chute into the tip of the supply chute. Flow through
Since the dust supply device flows in while being surrounded by the air film, the dust supply device can cool the air blowout portion provided in the air cooling jacket to the tip portion of the supply chute, and at the same time, the blown air causes the feed chute to reach its tip portion. Being enclosed, the supply chute is not directly exposed to the atmosphere in the furnace and is simultaneously protected from corrosion and overheating. Furthermore, since the air blown out from the air cooling jacket is blown into the furnace and can function as primary air, the air supply equipment for supplying primary air can be used as it is, and the air cooling jacket for cooling the dust supply device can be supplied with air. It is not necessary to separately provide an air supply device for supplying the air. As a result, since it is not necessary to provide an air supply device for cooling air, it is possible to simplify the equipment, and at the same time, the supply chute of the dust supply device can be protected from overheating and corrosion. It is also possible to configure the supply chute with a material having a relatively low heat resistance that does not have the above, and it is possible to provide an inexpensive and reliable cooling structure for the dust supply device. [Additional Configuration 1 and Operation and Effect] It is better if the combustion air supply pipe of the incinerator is connected (corresponding to claim 2) to the cooling air pipe that is supplied to the air-cooling jacket having the above-mentioned characteristic structure. With this configuration, it is not necessary to separately provide an air supply device for supplying air to the air cooling jacket for cooling the dust supply device. Moreover, the air that is used for cooling and blown out from the air cooling jacket is heated during cooling, and the heat loss can be reduced by supplying the combustion air that holds this cooling heat into the furnace . As a result, a special air supply device for cooling air is not required, the equipment can be simplified, and at the same time, the supply chute of the dust supply device can be protected from overheating and corrosion, so it does not have special corrosion resistance and is relatively heat resistant. It is possible to provide the cooling structure of the dust supply device that enables the supply chute to be formed of an inexpensive material having a low cost, has a simplified facility, and can be cooled at a low cost.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of the present invention,
A waste incinerator according to the present invention constituted by a rotary kiln will be described below with reference to the drawings. FIG. 3 shows a waste incineration facility to which the present invention is applied. In the rotary kiln 10, the input waste W in the cast steel rotary drum 12 is used.
Are inverted and agitated, and the combustion air is entrained therein to maintain combustion. And the rotating body 1
The guide fins provided in a spiral shape on the inner wall of the nozzle 2 transfer the toner to the outlet side of the rotary kiln 10 as it rotates, and the residue after combustion is discharged from the outlet and drops into the ash processing device 22. The dust supply device 1 for inputting the input waste W is
A hood 11 made of heat-resistant cast steel, which is provided on a support leg and is fixed to the inlet side of the rotary kiln 10 in a gas-sealed state between the rotary kiln 10 and a rotary drum 12 of the rotary kiln 10.
Is installed in. The dust supply device 1 includes a hopper 8 for receiving the waste W to be input, a supply chute 2 made of low alloy cast steel for supplying the received waste W into the furnace, and the supply chute for the received waste W. The waste W is dropped and supplied from the tip of the supply chute 2 to the bottom of the rotary drum 12. The hopper 8 is provided with an air-cooling jacket 3A having a steel plate welding structure for cooling. Further, as shown in detail in FIG. 1, the air cooling jacket 3 having a steel plate welding structure is attached to surround the supply chute 2. Further, both jackets 3A, 3 are connected by an air supply pipe so that the air discharged from the air cooling jacket 3A is supplied to the air cooling jacket 3. As shown in FIG. 2, the air-cooling jacket 3 is provided with an air supply unit 3a around which an air supply pipe 4 is connected, and the side in contact with the hood 11 is an air blowing unit along the supply chute 2. 3c is provided. That is, the opening for mounting the dust supply device 1 of the hood 11 is aligned with the air cooling jacket 3. The air pipe for combustion from the combustion air fan for blowing the combustion air for burning the received waste W into the furnace is the air cooling jacket 3.
It is connected to A, and the entire amount of combustion air is blown into the furnace along the supply chute 2 so as to surround the supply chute 2 through both the jackets 3A and 3A. The rotating drum 12 is provided with a tire 13 for supporting and rotating the rotating drum 12 on its outer peripheral surface, and is rotatably supported by a supporting and supporting roller 14 of a supporting mechanism. Further, a rotary drive mechanism 15 for driving and rotating the rotary drum 12 is provided, and the rotary drum 12 includes:
A girth gear 15b is attached so as to surround the outer peripheral surface, meshes with the pinion 15a of the rotary drive mechanism 15, and receives the rotational drive force of the pinion 15a,
The rotary drum 12 is rotated. Combustion residues are discharged from the outlet of the rotary drum 12 of the rotary kiln 10 and sent to an ash treatment facility from an ash treatment device 22 provided below the outlet. A re-combustion chamber 20 is formed above the ash processing device 22 with a space, and is configured to re-burn the combustion exhaust gas from the rotary kiln 10. The re-combustion chamber 20 is provided with a burner 21 for blowing waste oil or the like into combustion. The combustion exhaust gas from the re-combustion chamber 20 passes through a waste heat boiler, an economizer, and an electric dust collector, and is then discharged into the atmosphere from a chimney through an exhaust gas cleaning device by an induced draft fan. As a result of configuring the air-cooling jacket 3 as described above, for example, the amount of cooling air sent to the air-cooling jacket of a normal rotary kiln has conventionally been about 20 to 60 Nm ³ / min. Since it exceeds 100 Nm ³ / min, by cooling the air-cooling jacket 3 with this primary air, sufficient cooling air can be supplied without providing a cooling air fan, and therefore, sufficient air can be supplied around the supply chute. A gas film can be formed, and the tip of the supply chute can be surely cooled, and at the same time, the supply chute can be prevented from being exposed to the atmosphere in the furnace. I was able to eliminate the need. Furthermore, since the flow velocity of the air blown from the air blowout part can be made sufficiently large, there is also an effect of sucking from the inside of the supply chute toward the inside of the furnace at the tip part of the supply chute, and suppressing the emission of odor from the dust supply device. In addition, the gas seal between the rotary cylinder and the hood, between the hood and the dust supply device, etc. can be simplified. In addition, since the combustion air is supplied from the air cooling jacket without providing the combustion air supply pipe as described above, a space is provided in the assembly part of the dust supply device to the hood of the rotary kiln. It has become possible. That is, in the small-diameter rotary kiln, the hood is not large enough in comparison with the size of the dust supply device, and therefore it was difficult to attach the air supply pipe to the narrow portion. The combustion air can be supplied only by providing the hood with an opening slightly larger than the supply chute.

Next, another embodiment of the present invention will be described. <1> In the above-described embodiment, the waste incinerator using only the rotary kiln is shown, but the furnace type is not limited to this, and the rotary kiln and the stoker furnace are cascade-connected, the stoker furnace. The present invention can be applied to any of those made of only. In the cascade-connected furnaces, the primary combustion air of the rotary kiln may be supplied to the air cooling jacket, and in the case of only the stoker furnace, the secondary combustion air of the stoker furnace may be supplied to the air cooling jacket. <2> The structure of the air blowing portion of the air-cooling jacket is not limited to that of the above-described embodiment, but a plurality of blow-in pipes are provided into the furnace so that the air to be jetted along the supply chute is fed into the furnace. Can be supplied to any of the above, and the configuration is arbitrary. In short, an air-cooling jacket is provided so as to surround a portion of the supply chute outside the furnace, and the exhaust air from the air-cooling jacket is guided along the supply chute and toward the inside of the furnace until the tip of the supply chute is reached. Any structure may be used as long as it can be supplied as combustion air while being surrounded by a fluidized gas film. Even if the supply chute is not completely surrounded by a fluidized gas film, the surface of the supply chute is constantly scavenged by the air blown from the air cooling jacket, and the contact with the corrosive gas in the furnace suppresses corrosion. It can be prevented to a sufficient degree. <3> In the above embodiment, the primary air is supplied to the air-cooling jacket and blown into the furnace from the air-cooling jacket. However, a part of the combustion air is supplied to the air-cooling jacket. It may be supplied. For example, in a stoker furnace, primary air may be directly supplied into the furnace and secondary air may be supplied from the air cooling jacket. Further, the combustion air supplied to the rotary kiln may be divided into two parts, a part of which may be directly supplied into the furnace from the air supply pipe and the other part may be supplied from the air cooling jacket. That is, the amount of air supplied to the air-cooling jacket may be designed to be determined by the balance between the air load of the furnace and the heated amount of the supply chute. <4> In the above embodiment, the combustion air is supplied to the inside of the furnace through the air cooling jacket, but the term combustion air used in each of the above descriptions also includes a usual auxiliary combustion gas. The auxiliary combustion gases such as oxygen-enriched air and component-added air are also called combustion air. <5> The materials used in the above embodiments are examples showing that materials different from conventional ones can be used. Regarding materials, configurations, structures, etc., the usage conditions and forms of the furnace are used. It can be appropriately selected according to the above.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of an example of a dust supply device using a cooling structure of the present invention.

FIG. 2 is a partial cross-sectional main part explanatory view showing an example of an air-cooling jacket of the present invention.

FIG. 3 is an explanatory view of a rotary kiln type waste incineration facility using the cooling structure of the present invention.

[Explanation of symbols] 2 Supply chute of dust collector 3 air-cooled jacket 3c Air outlet

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-52-141078 (JP, A) JP-A-5-272728 (JP, A) Actually open Sho-52-118580 (JP, U) Actual-open Sho-50- 113273 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23G 5/44 F23K 3/00

Claims (2)

(57) [Claims] 1. A dust supply device for an incinerator, comprising: a supply chute (2) for supplying an object to be treated into the furnace; and an air cooling jacket (3) surrounding and cooling the supply chute (2). The cooling structure comprises: from the air cooling jacket (3) to the supply chute (2).
Toward the inside of the furnace and enclosing the feed chute (2)
The cooling structure of the dust supply device of the incinerator that forms the surrounding gas film . 2. The cooling structure for a dust supply device for an incinerator according to claim 1, wherein a combustion air supply pipe for the incinerator is connected to a cooling air pipe for supplying to the air cooling jacket (3).