JP2001201025A - Garbage incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten the quantity of work of removing deposits such as clinker or the like by checking the corrosion of the sidewall 6 in the secondary combustion region S in a garbage incinerator in which an opening 3 to a flue 3 for guiding combustion gas is made into a narrow part upward at the ceiling 2 of a furnace 1, and a secondary combustion region S is made by enlarging the flue 4 above the opening 3, and a nozzle 10 for secondary combustion for blowing in gas containing oxygen for secondary combustion is provided in the opening 3 or in its vicinity. SOLUTION: The inclined wall 7 in a passage enlarged section 5 above an opening 3 is provided with the first combustion gas diffusing nozzle 12 capable of blowing gas for checking the sediment of combustion gas. What is more, in the case of covering the sidewall 6 in the region ranging from the furnace 1 to the secondary combustion region S with refractory 9 and equipping it with a metallic wall 8 above it, the top sidewall 6a positioned at the top brim 9a of the refractory 9 is provided with the secondary combustion gas diffusing nozzle 14 capable of blowing the gas for checking the sediment of the combustion gas along the metallic wall 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse incinerator and, more particularly, to an opening for a flue for guiding a combustion gas upward in a ceiling of a furnace, and the opening is narrowed. And the flue is enlarged above the opening to form a secondary combustion region, and the oxygen-containing gas for secondary combustion is directed toward the combustion gas at or near the opening. The present invention relates to a refuse incinerator provided with a secondary combustion nozzle to be blown.

[0002]

2. Description of the Related Art Conventionally, in a garbage incinerator, as shown in FIG. 3, a ceiling 2 of a furnace 1 provided with a stoker type grate 17 for incineration while carrying garbage received from a garbage receiving mechanism 16 is provided. An opening 3 to a flue 4 for guiding the combustion gas upward is provided, the opening 3 is formed in a narrow portion, and the flue 4 is enlarged above the opening 3 to be secondary. A combustion region S is formed, and a side wall portion 6 in a region extending from the furnace 1 to the secondary combustion region S is covered with a refractory material 9. A secondary combustion nozzle 10 for blowing a contained gas toward the combustion gas is provided. The secondary combustion nozzle 10 stirs the combustion gas rising from the opening 3 to completely mix the unburned combustible gas and the primary air in order to completely burn the combustion gas generated in the furnace 1. At the same time, it supplies insufficient oxygen.

[0003]

In the above-mentioned conventional refuse incinerator, as shown in the drawing, an enlarged flow path portion 5 is formed above the opening 3, and the above-mentioned enlarged flow path portion 5 has the above-mentioned structure. An inclined wall portion 7 exists near the upper side of the opening 3, and fly ash accompanying the combustion gas is generated due to a decrease in the flow velocity of the combustion gas rising through the opening 3 and a turbulence in the flow near the side wall portion 6. And the clinker is easily deposited on the inclined wall portion 7. For this reason, corrosion is likely to occur in the refractory 9 at a portion where the fly ash and clinker are deposited. Also, at the upper edge 9a of the refractory 9 coated on the side wall 6 in the region from the furnace 1 to the secondary combustion region S, the vortex of the combustion gas due to the step of the wall surface of the side wall 6 is formed. The combustion gas stagnates easily along the metal wall 8 above the upper edge 9a, and the metal wall 8 is likely to be reduced and corroded by carbon monoxide in the stagnated combustion gas. For this reason, when corrosion occurs on the side wall 6 of the secondary combustion region S, if the corrosion of the refractory 9 occurs, the refractory 9
If the metal wall portion 8 is corroded, boiler water for cooling the metal wall portion 8 blows out into the secondary combustion area S, and the function of the boiler deteriorates. I have. Therefore, an object of the present invention is to solve the above problems, prevent corrosion of the side wall in the secondary combustion region, and reduce the amount of work for removing deposits such as clinker.

[0004]

[Means for Solving the Problems] The garbage incinerator according to the present invention is characterized in that stagnation of combustion gas along side walls in a secondary combustion region is prevented. Each has the following features.

[0005] A first characteristic configuration of the refuse incinerator of the present invention for the above purpose is as described in claim 1, wherein an opening to a flue for guiding a combustion gas upward is provided in a ceiling of a furnace. Part, the opening is formed in a narrow part, and the flue is enlarged above the opening to form a secondary combustion area, and the secondary combustion area is formed in or near the opening. In a refuse incinerator provided with a secondary combustion nozzle that blows oxygen-containing gas toward the combustion gas, a gas that prevents stagnation of the combustion gas is formed on an inclined wall portion in an enlarged flow path portion above the opening. Is provided with a gas blowing mechanism provided with a first combustion gas diffusion nozzle capable of blowing air. Incidentally, claim 2
As described in the above, the secondary combustion gas supply passage for supplying the secondary combustion oxygen-containing gas to the secondary combustion nozzle is branched and connected to the first combustion gas diffusion nozzle in the first characteristic configuration. Is preferable (second characteristic configuration). As described in claim 3, the clinker attached to the inclined wall portion near the tip of the first combustion gas diffusion nozzle is mechanically attached to the gas blowing mechanism in the first feature configuration or the second feature configuration. It is more preferable that a clinker removing mechanism that can be removed is provided (third characteristic configuration).
A first diffusion gas supply path for supplying the gas to the first combustion gas diffusion nozzle in the characteristic configuration is detachably connected to the gas blowing mechanism, and the clinker removing mechanism is detachably attached to the gas blowing mechanism. It is even better if it is done (fourth characteristic configuration).

A fifth characteristic configuration of the refuse incinerator of the present invention for the above purpose is as described in claim 5, wherein an opening to a flue for guiding combustion gas upward is provided in a ceiling portion of the furnace. Part, the opening is formed in a narrow part, the flue is enlarged above the opening to form a secondary combustion region, and a region extending from the furnace to the secondary combustion region. The side wall portion is coated with a refractory, and at or near the opening,
In a refuse incinerator provided with a nozzle for secondary combustion that blows oxygen-containing gas for secondary combustion toward the combustion gas,
A gas capable of injecting a gas for preventing stagnation of the combustion gas along an upper end side wall portion and a metal wall portion located above the upper end side wall portion located at the upper end edge portion of the refractory covering the side wall portion. The point is that a gas blowing mechanism having a two-combustion gas diffusion nozzle is provided. According to a sixth aspect of the present invention, the second combustion gas diffusion nozzle according to the fifth feature is provided with a secondary combustion gas supply passage for supplying a secondary combustion oxygen-containing gas to the secondary combustion nozzle. It is preferable that they are branched and connected (sixth feature configuration). According to a seventh aspect of the present invention, the gas injection mechanism according to the fifth or sixth aspect of the present invention mechanically removes the clinker attached to the upper end side wall near the tip of the second combustion gas diffusion nozzle. It is more preferable if a possible clinker removing mechanism is provided (seventh characteristic configuration), and the second diffusion gas supply for supplying the gas to the second combustion gas diffusion nozzle in the seventh characteristic configuration as described in claim 8. It is further preferable that a path is detachably connected to the gas blowing mechanism, and the clinker removing mechanism is configured to be detachable from the gas blowing mechanism (eighth characteristic configuration).

According to the refuse incinerator according to the present invention, the combustion gas along the side wall is prevented from stagnating, so that fly ash and clinker are deposited on the side wall and the side wall. Corrosion can be prevented, and each has the following unique effects.

[0008] According to the first characteristic configuration, by providing the first combustion gas diffusion nozzle on the inclined wall portion above the opening, it is possible to prevent combustion gas stagnation along the inclined wall portion and to prevent fly ash and clinker. Deposition on the inclined portion can be prevented. Further, even if fly ash and clinker are to be deposited on the inclined wall portion, they are blown off by the jet of the oxygen-containing gas for secondary combustion from the first combustion gas diffusion nozzle, and the inclined wall portion is The deposition of the fly ash and clinker on the surface can be prevented.
As a result, the corrosion of the inclined wall portion can be prevented. In addition, the configuration of the second characteristic configuration is advantageous because the secondary combustion can be controlled only by adjusting the supply amount of the secondary combustion oxygen-containing gas from the secondary combustion gas supply passage. Further, according to the third characteristic configuration, the gas blowing mechanism is provided with a clinker removing mechanism that can mechanically remove the attached clinker by, for example, sticking out with a rod-like body or cutting off with a reamer-shaped rotating member. If so, even if the clinker adheres so as not to be blown off by the fluid, the clinker removing mechanism can remove the clinker, which is more convenient. In addition, if the first combustion gas diffusion nozzle is attached to the gas blowing mechanism so as to be able to be pushed and pulled, the first combustion gas diffusion nozzle can also function as the clinker removing mechanism, and during the operation of the furnace, It is convenient because the clinker can be removed. In addition, as in the fourth characteristic configuration, the first diffusion gas supply path is detachably connected to the gas blowing mechanism, so that the first combustion gas is supplied with the first diffusion gas supply path removed. Since the clinker removal mechanism can be attached to the attachment site of the gas diffusion nozzle,
The clinker removal operation can be easily performed.

According to the fifth feature, the refractory that protects the side wall of the secondary combustion area has a step at the upper edge, so that the combustion gas is easily swirled. Secondary combustion oxygen-containing gas from the secondary combustion gas diffusion nozzle prevents stagnation of the combustion gas by the vortex,
The deposition of fly ash and clinker on the upper edge of the refractory can be prevented, and furthermore, the stagnation of the combustion gas is prevented, so that the combustion gas in the region along the side wall can be completely burned and reduced. By preventing the combustion gas having the property from coming into contact with the metal wall portion, the reduction corrosion of the metal wall portion can be prevented. In addition, if comprised like the said 6th characteristic structure, similarly to the said 2nd characteristic structure, secondary combustion will be carried out only by adjusting the supply amount of the oxygen-containing gas for secondary combustion from the gas supply path for secondary combustion. This is convenient because it can be controlled. Further, according to the seventh characteristic configuration, similarly to the second characteristic configuration, a clinker removing mechanism is provided.
For example, if the gas blowing mechanism is configured to be able to mechanically remove the attached clinker by protruding it off with a rod-like body, or by removing it with a rotating member capable of removing the clinker on the front surface or side surface, the fluid is provided. Even if the clinker adheres to such an extent that it cannot be blown off, the clinker removing mechanism can remove the clinker, which is more convenient. Incidentally, if the second combustion gas diffusion nozzle is attached to the gas blowing mechanism so as to be able to be pushed and pulled, the second combustion gas diffusion nozzle can also function as the clinker removal mechanism. It is convenient because the clinker can be removed. Further, as in the eighth characteristic configuration, the second diffusion gas supply passage is detachably connected to the gas blowing mechanism, so that the second combustion gas supply passage is detached from the second combustion gas supply passage. Since the clinker removing mechanism can be mounted on the mounting portion of the gas diffusion nozzle, the clinker removing operation can be easily performed similarly to the fourth characteristic configuration.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the refuse incinerator according to the present invention will be described below with reference to the drawings. Note that the same elements as those described in the related art and elements having the same functions are denoted by the same reference numerals as in FIG. 3 and a part of the detailed description is omitted.

[0011] As shown in FIG.
Flue 4 that guides combustion gas upwards
The opening 3 is formed in a narrow portion, and the flue 4 is formed in a flow path expanding portion 5 which is enlarged above the opening 3 to form a secondary combustion region S. A secondary combustion nozzle 10 for blowing a secondary combustion oxygen-containing gas toward the combustion gas is provided in or near the opening 3, and further from the furnace 1 to the secondary combustion area S. The side wall 6 in the region extending thereover is covered with a refractory 9, and the side wall 6 located above the upper edge 9a of the refractory 9 is formed as a metal wall 8 cooled by a water pipe of a boiler.

Above the opening 3 in the enlarged flow path portion 5 is formed an inclined wall portion 7, and the first combustion gas into which the gas for preventing the combustion gas from stagnating can be blown into the inclined wall portion 7. A diffusion nozzle 12 is provided. Further, a gas for preventing the combustion gas from stagnating along the upper end side wall 6a and the metal wall 8 located above the upper end side wall 6a located at the upper end edge 9a of the refractory 9 can be blown. A second combustion gas diffusion nozzle 14 is provided. Further, a first diffusion gas supply passage 13 for supplying gas to the first combustion gas diffusion nozzle 12 and the second combustion gas diffusion so as to use an oxygen-containing gas for secondary combustion as a gas for preventing stagnation of the combustion gas. Second diffusion gas supply path 1 for supplying gas to nozzle 14
5, a secondary combustion gas supply passage 11 for supplying a secondary combustion oxygen-containing gas to the secondary combustion nozzle 10 is branched and connected.

Both the first combustion gas diffusion nozzle 12 and the second combustion gas diffusion nozzle 14 are arranged at appropriate intervals in the circumferential direction of the flue 4 in a direction perpendicular to the side wall surface of the side wall portion 6 attached thereto. Arrange a plurality toward. As described above, the two combustion gas diffusion nozzles 12 and 14 are arranged along the circumferential direction.
Are arranged at appropriate intervals, each combustion gas diffusion nozzle 1
The stagnation of the combustion gas along the side wall 6 can be prevented without intensifying the fumes from the fuel tanks 2 and 14, and fly ash and clinker are prevented from depositing on the inclined wall 7 or the upper edge 9a. It can be prevented.

[Other Embodiments] Embodiments of a refuse incinerator according to the present invention not shown in the above embodiment will be described below.

<1> In the above embodiment, the furnace 1
Flue 4 that guides combustion gas upwards
A first combustion gas diffusion nozzle 12 capable of injecting a gas for preventing stagnation of combustion gas is provided on an inclined wall portion 7 formed above an opening 3 to an enlarged flow path portion 5 of the furnace. The upper edge 9a of the refractory 9 covering the side wall 6 in the region extending over the secondary combustion region S formed in the enlarged channel portion 5 of the road 4
Although the example in which the second combustion gas diffusion nozzle 14 is provided on the upper end side wall portion 6a located above is described, either one of the first combustion gas diffusion nozzle 12 or the second combustion gas diffusion nozzle 14 is omitted. Is possible. Depending on the structure of the furnace and the conditions of use, fly ash and clinker are not necessarily deposited on both the inclined wall 7 and the upper edge 9a of the refractory 9, and the inclined wall 7 and the metal are not always deposited. This is because both of the wall portions 8 do not always corrode.

<2> In the above embodiment, an example in which the secondary combustion gas supply path 11 is branched and connected to the first diffusion gas supply path 13 and the second diffusion gas supply path 15 has been described. Alternatively, a diffusion gas supply path separately connected to a supply source may be provided in both or one of the combustion gas diffusion nozzles 12 and 14 to inject another gas. The gas supplied in this case may be an inert gas such as a combustion exhaust gas instead of the oxygen-containing gas.
The gas supplied to the second combustion gas diffusion nozzle 14 is preferably an oxygen-containing gas from the viewpoint of preventing reduction corrosion of the metal wall 8, and in this case, it will be described in the above embodiment. The second diffusion gas supply path 15
Is preferably branched from the secondary combustion gas supply passage 11 from the viewpoint of simplifying combustion control.

<3> In the above embodiment, the first combustion gas diffusion nozzle 12 and the second combustion gas diffusion nozzle 14
Are arranged on the side wall 6 in the circumferential direction of the flue 4 at appropriate intervals. However, the arrangement interval is arbitrary and may be a small interval. Large intervals such as locations may be used. In the case of a small interval, a sufficient diffusion effect can be obtained even if the amount of blast gas from each of the combustion gas diffusion nozzles 12 and 14 is reduced. In addition, if they are arranged at large intervals, the effect of diffusing the combustion gas can be enhanced by increasing the amount of the fumed gas.

<4> In the above embodiment, the first combustion gas diffusion nozzle 12 and the second combustion gas diffusion nozzle 14
Are arranged in the circumferential direction of the flue 4 in a direction perpendicular to the side wall surface of the side wall portion 6 attached thereto, but these arrangement directions are not necessarily perpendicular to the side wall surface. For example, as shown in FIG. 2, when the first combustion gas diffusion nozzle 12 is disposed relatively above the inclined wall 7, the first combustion gas diffusion nozzle 12 The first combustion gas diffusion nozzle 12 may be disposed slightly toward the upstream side, and the first combustion gas diffusion nozzle 12 is disposed near the lower end of the inclined wall portion 7, that is, near the opening 3 formed in the ceiling 2 of the furnace 1. In this case, the second combustion gas diffusion nozzle 14 may be arranged toward the downstream side of the combustion gas. In addition, for example, as shown in FIG. 2, when the second combustion gas diffusion nozzle 14 is disposed at the upper edge 9 a of the refractory 9, the second combustion gas diffusion nozzle 14 When the second combustion gas diffusion nozzle 14 is disposed on the metal wall portion 8, the second combustion gas diffusion nozzle 14 may be disposed toward the upstream side of the combustion gas. They may be arranged.

<5> The gas blowing mechanism B may be provided with a clinker removing mechanism capable of mechanically removing the clinker attached to the inclined wall near the tip of the first combustion gas diffusion nozzle 12. Further, the clinker removing mechanism may be configured to be capable of mechanically removing the clinker attached to the upper end side wall near the tip of the second combustion gas diffusion nozzle 14. Even if the clinker adheres so as not to be blown off depending on the fluid, the clinker removing mechanism can remove the clinker, which is more convenient. Incidentally, if one or both of the first combustion gas diffusion nozzle 12 and the second combustion gas diffusion nozzle 14 are attached to the gas blowing mechanism B so as to be able to be pushed and pulled, the first combustion gas diffusion nozzle 12 or the The second combustion gas diffusion nozzle 14 can also function as the clinker removing mechanism, and the clinker removing operation can be performed during the operation of the furnace, which is convenient.

<6> In the above <5>, the first diffusion gas supply passage 1 for supplying gas to the first combustion gas diffusion nozzle 12
3 or one or both of the second diffusion gas supply paths 15 for supplying the gas to the second combustion gas diffusion nozzle 14 are detachably connected to the gas blowing mechanism B, and the clinker removing mechanism is connected to the gas It may be configured to be detachable from the blowing mechanism B. The clinker removing mechanism can be mounted on the mounting portion of the first combustion gas diffusion nozzle 12 or the second combustion gas diffusion nozzle 14 with the first diffusion gas supply passage 13 or the second combustion gas diffusion nozzle 14 removed. In addition, the clinker removing operation can be easily performed.

<7> Instead of the configuration of <6>, the first combustion gas diffusion nozzle 12 can be moved forward or side by protruding a clinker at its tip or rotating it. The first combustion gas diffusion nozzle 12 may be configured to function as the clinker removal mechanism with the first diffusion gas supply path 13 removed. . This point is the same for the second combustion gas diffusion nozzle 14,
The second diffusion gas supply nozzle 14 has a structure in which the clinker can be removed from the front or side surface by protruding the clinker at its own end or rotating the clinker at the front end thereof. The second combustion gas diffusion nozzle 14 may be configured to function as the clinker removing mechanism with the path 15 removed.

[0022]

As described above, according to the present invention,
Corrosion of the side wall in the secondary combustion region is prevented, and deposition of clinker and the like can be prevented.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an example of a flue provided above a refuse incinerator according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing another example of a flue provided above a refuse incinerator according to the present invention.

FIG. 3 is a vertical sectional view of a main part showing a flue formed upward of a conventional refuse incinerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace 2 Ceiling part 3 Opening part 4 Flue 5 Channel expansion part 6 Side wall part 6a Upper side wall part 7 Inclined wall part 8 Metal wall part 9 Refractory 9a Upper edge part 10 Secondary combustion nozzle 11 Gas for secondary combustion Supply path 12 First combustion gas diffusion nozzle 13 First diffusion gas supply path 14 Second combustion gas diffusion nozzle 15 Second diffusion gas supply path B Gas blowing mechanism S Secondary combustion area

Claims (8)

[Claims] An opening (3) to a flue (4) for guiding a combustion gas upward is provided in a ceiling (2) of a furnace (1), and the opening (3) is narrowed. And the flue (4) is enlarged above the opening (3) to form a secondary combustion region (S). The secondary combustion zone (S) is formed in the vicinity of the opening (3). What is claimed is: 1. A refuse incinerator provided with a secondary combustion nozzle (10) for blowing a secondary combustion oxygen-containing gas toward the combustion gas, wherein a slope in a flow path enlarged portion (5) above the opening (3) is provided. A refuse incinerator provided with a gas injection mechanism (B) having a first combustion gas diffusion nozzle (12) capable of injecting a gas for preventing stagnation of the combustion gas on a wall (7). 2. The first combustion gas diffusion nozzle (12).
2. The refuse incinerator according to claim 1, wherein a secondary combustion gas supply passage (11) for supplying a secondary combustion oxygen-containing gas to the secondary combustion nozzle (10) is branched. 3. A clinker removing mechanism capable of mechanically removing a clinker attached to the inclined wall portion (7) near a tip portion of the first combustion gas diffusion nozzle (12) to the gas blowing mechanism (B). The refuse incinerator according to claim 1 or 2, further comprising: 4. The clinker removing mechanism by detachably connecting a first diffusion gas supply path (13) for supplying the gas to the first combustion gas diffusion nozzle (12) to the gas blowing mechanism (B). The refuse incinerator according to claim 3, wherein the refuse incinerator is configured to be attached to and detached from the gas blowing mechanism (B). 5. A ceiling (2) of a furnace (1) is provided with an opening (3) to a flue (4) for guiding a combustion gas upward, and said opening (3) is narrowed. And the flue (4) is enlarged above the opening (3) to form a secondary combustion region (S). The secondary combustion region (S) is formed from the furnace (1). The side wall (6) of the region extending over S) is covered with a refractory (9), and the oxygen-containing gas for secondary combustion is blown into the opening (3) or the vicinity thereof toward the combustion gas. A refuse incinerator provided with a next combustion nozzle (10), wherein an upper end side wall (6a) located on an upper end edge (9a) of the refractory (9) covering the side wall (6) is provided. , Its upper side wall (6a) and its upper metal wall (8)
A refuse incinerator provided with a gas injection mechanism (B) including a second combustion gas diffusion nozzle (14) capable of injecting a gas for preventing stagnation of the combustion gas along the line. 6. The second combustion gas diffusion nozzle (14).
6. The refuse incinerator according to claim 5, wherein a secondary combustion gas supply passage (11) for supplying a secondary combustion oxygen-containing gas to the secondary combustion nozzle (10) is branched. 7. A clinker removing mechanism capable of mechanically removing the clinker attached to the upper end side wall (6a) near the tip of the second combustion gas diffusion nozzle (14) to the gas blowing mechanism (B). The refuse incinerator according to claim 5 or 6, further comprising: 8. The clinker removing mechanism by detachably connecting a second diffusion gas supply path (15) for supplying the gas to the second combustion gas diffusion nozzle (14) to the gas blowing mechanism (B). The refuse incinerator according to claim 7, wherein the refuse incinerator is configured to be detachably attached to the gas blowing mechanism (B).