JPH11325446A - Ash melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce consumption of thermal energy upon temperature rise in an ash melting furnace and shorten the time required form the temperature rise, and even upon stationary operation restrict thermal energy loss and hence effectively melt an ash fraction, by improving heat insulation effect. SOLUTION: The present melting furnace is constructed with an ash melting furnace body 1 including an ash supply section 2, a slag discharge section 3, and a gas exhaust section 5, and a heat insulation container 6 where there is formed a heat insulation space 7 communicating with a gas exhaust section 5 and enclosing the ash melting furnace body 1 and where there is provided an exhaust section 8. Part or the whole of the ash melting furnace body 1 is constructed with fired ceramic material with a main component comprising silicon carbide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ash melting furnace attached to a municipal solid waste incinerator or an industrial waste incinerator for melting ash generated in a furnace facility such as an incinerator or a gasification furnace. is there.

[0002]

2. Description of the Related Art In recent years, with the decrease in landfill sites for garbage,
There is a demand for reduction of incineration ash, and the development of incineration ash melting means capable of significantly reducing the amount is in progress. Decomposition of dioxins due to melting has also been confirmed, and this treatment has attracted attention in terms of detoxification. However, since the incineration ash must be melted at a high temperature of 1200 ° C. or more, it consumes a large amount of energy and has a drawback of high cost. For this reason, ash melting furnaces have been developed in which part of the combustion energy of the incinerated material is used for the ash melting energy.

As one example, for example, Japanese Patent Publication No. 1-52
There is a waste incineration system disclosed in Japanese Patent No. 654.
FIG. 12 is a principle view showing a waste incineration system disclosed in Japanese Patent Publication No. 1-26544. In FIG.
120 is a fluidized bed incinerator, 121 is waste, 122 is residual ash discharged from the fluidized bed incinerator 120, 123 is fine ash called fly ash (not shown) and flammable pyrolysis gas (not shown) will be described later. The flue sent to the ash melting furnace body 125, 12
4 is a pulverizer for finely pulverizing the residual ash 122. Also,
Reference numeral 125 denotes an ash melting furnace main body that heats and melts the ash (hereinafter, simply referred to as “ash”) such as the crushed residual ash 122 and the fly ash described above, and the furnace wall has a heat-resistant brick or an irregular castable refractory. Alternatively, the outer periphery of the furnace is covered with a thick heat insulating material (not shown). Also, 12
6 is a molten slag, 127 is a slag reservoir, and 128 is a heat exchanger for preheating combustion air by the heat of exhaust gas.

Next, the operation will be described. Waste 121
When the waste 121 is supplied to the fluidized bed incinerator 120 that supplies air that is slightly insufficient with respect to the supply amount, the combustion state becomes incomplete, and the residual ash 122, fly ash (not shown), and unburned flammable Generates pyrolysis gas. The fly ash (not shown) and the flammable pyrolysis gas are led to the ash melting furnace main body 125 by the flue 123. In addition, the residual ash 122 is crushed by a pulverizer 124.
And then supplied to the ash melting furnace body 125 in the same manner as fly ash.

[0005] The ash melting furnace body 125 is supplied with combustion air so as to swirl along the inner wall by a melting burner (not shown) or the like so as to melt the ash. Is also mixed. As a result, the ash melting furnace main body 125 obtains a combustion state, so that the ash melting furnace body 125 is maintained at a high temperature of about 1200 ° C. or more, fine ash is melted in a swirling flow and changes into molten slag 126, and the slightly coarse ash is When it comes into contact with the wall surface, it is melted and changes to a molten slag 126. The molten slag 126 thus generated is dropped and collected in the slag reservoir 127. The high-temperature exhaust gas preheats the combustion air in the heat exchanger 128 and is discharged into the atmosphere.

[0006]

Since the conventional ash melting furnace is configured as described above, the heat capacity of the furnace body of the ash melting furnace body 125 and the heat insulating material becomes large, and the ash is melted to a temperature at which the ash can be sufficiently melted. When the melting furnace body 125 is heated, there is a problem that much heat energy is consumed. Also,
When the furnace wall is made of a heat-resistant brick or an amorphous castable refractory, it takes a long time to reach a temperature required for melting because the furnace will be broken unless the heating rate is reduced by heating.

Such a problem that energy consumption at the time of raising the temperature of the furnace and that it takes a long time to raise the temperature cannot be ignored even in the ash melting furnace body 125 attached to a continuously operating incinerator or the like. That is, the combustion gas and the ash of the supplied pyrolysis gas are swirling in the ash melting furnace main body 125, and the molten slag 126 and unmelted ash collide with the furnace wall at high speed. At this time, since the furnace wall is also in a high temperature state, it is in a state where erosion due to collision of the molten slag 126 and unmelted ash and damage due to thermal stress are likely to occur. Therefore, there is a problem that it is necessary to repair the furnace wall in a relatively short time, and it is necessary to raise the temperature each time.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By increasing the heat insulating effect, it is possible to reduce the consumption of heat energy when raising the temperature of an ash melting furnace and to shorten the time required for raising the temperature. It is an object of the present invention to obtain an ash melting furnace capable of efficiently melting ash while suppressing loss of heat energy even during steady operation.

Further, the present invention provides an ash melting furnace capable of preventing damage to the ash melting furnace and maintaining the melting function for a long time by using a material which is resistant to erosion at a portion where ash or molten slag in a high temperature state comes into contact. The purpose is to:

[0010]

SUMMARY OF THE INVENTION An ash melting furnace according to the present invention has a part or the whole of an ash melting furnace main body having an ash supply part, a slag discharge part, and a gas discharge part, whose main component is silicon carbide. It is made of fired ceramic material.

An ash melting furnace according to the present invention has an ash melting furnace main body having an ash supply section, a slag discharge section, and a gas discharge section, and communicates with the gas discharge section of the ash melting furnace main body. And a heat-insulating container having an exhaust portion for communicating the heat-insulating space with the outside air.

The ash melting furnace according to the present invention has a combustion device for heating the ash melting furnace main body provided in a heat insulating container.

In the ash melting furnace according to the present invention, an ash supply unit is provided at one longitudinal end of the ash melting furnace main body, and a gas exhaust unit is provided at the other end, and an exhaust unit is provided near the ash supply unit. It is arranged.

In the ash melting furnace according to the present invention, an ash supply section is provided at one longitudinal end of the ash melting furnace main body, and a gas discharge section is provided at the other end, and an exhaust section is provided near the gas discharge section. And a combustion device is arranged near the ash supply section.

In the ash melting furnace according to the present invention, a slag discharge portion is provided on the bottom surface of the inner wall of the ash melting furnace body, and the ash melting furnace body is installed so that the bottom surface of the ash melting furnace is horizontal.

In the ash melting furnace according to the present invention, a slag discharge portion is provided on the bottom surface of the inner wall of the ash melting furnace main body, and the bottom surface of the inner wall is inclined such that the slag discharge portion is located at a lower position.

In the ash melting furnace according to the present invention, a support member for mounting the ash melting furnace main body is provided in a heat insulating container.

In the ash melting furnace according to the present invention, a supporting member for suspending the ash melting furnace main body is provided in a heat insulating container.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a sectional view showing an ash melting furnace according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a part obtained by heating and melting ash generated in a furnace facility such as an incinerator or a gasification furnace (not shown). Alternatively, it is an ash melting furnace main body composed of fired ceramics of which all main components are made of silicon carbide. Reference numeral 1a denotes an inner wall bottom surface of the ash melting furnace main body 1, and 2 denotes an ash supply section vertically provided at one longitudinal end of the ash melting furnace main body 1 for introducing ash (not shown), together with a flame such as a melting burner (not shown). The ash is supplied into the ash melting furnace main body 1 to form a swirling flow. Reference numeral 3 denotes a slag discharge portion provided on the inner wall bottom surface 1a at the other end in the longitudinal direction of the ash melting furnace main body 1 for discharging the molten slag 4, and 5 is provided near the slag discharge portion 3 and is generated when the molten slag 4 is generated. It is a gas discharge section that discharges exhaust gas. Reference numeral 6 denotes a heat insulating container for keeping the ash melting furnace main body 1 warm. In addition, as a material of the heat insulating container 6, for example, a heat-resistant ceramic fiber or the like can be used.

Next, the operation will be described. The ash supplied from the ash supply unit 2 to the ash melting furnace main body 1 turns to a high temperature due to a heat source for melting such as a combustible substance or its combustion gas which is simultaneously supplied while turning along the inner wall surface and is melted. And becomes molten slag 4. At this time, the ash and the molten slag 4 violently collide with the inner wall surface of the ash melting furnace main body 1 at a high temperature. The molten slag 4 is discharged from the slag discharge unit 3 to the outside of the ash melting furnace main body 1, and is water-cooled and solidified by a water-cooling solidifying means (not shown) and recovered.

As described above, according to the first embodiment, part or all of the ash melting furnace main body 1 is made of a fired ceramic material whose main component is silicon carbide. The effect of reducing damage due to collision or erosion of high-temperature ash or molten slag 4 can be obtained as compared with the case where a conventional material is used.

Further, when a part or all of the material of the ash melting furnace main body 1 is made of a fired ceramic material whose main component having high thermal strength is silicon carbide, other materials are used. As a result, the temperature rising speed can be increased, and the effect of shortening the temperature rising time at startup or the like can be obtained.
For example, many conventional furnaces use refractory bricks or castable refractories, so the rate of temperature rise is 15 hours per hour.
Although the temperature is limited to about 0 ° C. to 200 ° C., in the case of the present invention using a ceramic material containing silicon carbide as a main component, a heating rate of about 450 ° C. to 500 ° C. per hour is possible.

Embodiment 2 FIG. FIG. 2 is a sectional view showing an ash melting furnace according to Embodiment 2 of the present invention. In the following description, the same members as those already described are denoted by the same reference numerals and description thereof will be omitted. In FIG. 2, reference numeral 7 denotes a heat insulating space formed so as to include the ash melting furnace main body 1, and its outer periphery is covered with a heat insulating container 6. Reference numeral 8 denotes an exhaust unit provided in the heat insulating container 6 for communicating the heat insulating space 7 with the outside air.

Next, the operation will be described. The ash supplied from the ash supply unit 2 to the ash melting furnace main body 1 turns to a high temperature due to a heat source for melting such as a combustible substance or its combustion gas which is simultaneously supplied while turning along the inner wall surface and is melted. And becomes molten slag 4. At this time, the bottom surface 1a of the inner wall is horizontal, so that gravity hardly acts on the horizontal movement of the ash trapped in the inner wall bottom surface, and
As a result, the ash is reliably melted, and the discharge of unmelted material is effectively prevented. The molten slag 4 thus generated is discharged from the slag discharge unit 3 to the outside of the ash melting furnace main body 1, and is cooled and solidified by a water-cooling solidifying means (not shown) and collected.

High-temperature exhaust gas generated by combustion or the like in the ash melting furnace main body 1 fills the heat insulating space 7 through the gas discharge section 5 and is discharged from the discharge section 8. At this time, the heat insulating space 7 is lower in temperature than the outer wall of the ash melting furnace main body 1, but is maintained at a higher temperature than the outside air or the inner wall of the heat insulating container 6. Thereby, the heat insulation performance of the ash melting furnace main body 1 is remarkably improved as compared with the conventional case where the heat insulating material is directly provided on the outer peripheral surface of the ash melting furnace. Therefore, it is possible to reduce the heat energy consumption at the time of raising the temperature of the ash melting furnace, shorten the time required for the temperature rise, and suppress the loss of the heat energy even at the time of the steady operation to efficiently melt the ash. In addition,
The exhaust gas discharged from the exhaust part 8 is released to the outside air after being subjected to preheating of the combustion air.

As described above, according to the second embodiment, since the heat insulating space 7 is formed around the ash melting furnace main body 1, the heat insulating material is directly provided on the outer peripheral surface of the ash melting furnace. As compared with the case, the heat insulating performance of the ash melting furnace main body 1 is remarkably improved. Therefore, it is possible to reduce the heat energy consumption at the time of raising the temperature of the ash melting furnace, to shorten the time required for the temperature rise, and to obtain the effect of suppressing the loss of the heat energy even during the steady operation and efficiently melting the ash. .

Further, since the ash melting furnace main body 1 is installed so that the inner wall bottom surface 1a of the ash melting furnace main body 1 is horizontal, the ash remains on the inner wall bottom surface 1a for a relatively long time, so that the ash melting can be performed. This is performed reliably, and the effect of effectively preventing the discharge of unmelted material is obtained.

Further, since only the exhaust gas or the like that has passed through the gas discharge section 5 comes into contact with the inner wall of the heat insulating container 6, there is little possibility of corrosion or deterioration, and even if the heat insulating container 6 is made of an inexpensive heat insulating material. As a result, the effect that the heat insulation performance can be maintained for a long time is obtained.

Further, through the heat insulating space 7, there is no need to directly insulate the high-temperature ash melting furnace main body 1 from the outside air, and the effect of reducing the amount of heat insulating material used for the heat insulating container 6 can be obtained.

Further, many parts of the ash melting furnace main body 1 except the ash supply part 2 and the slag discharge part 3 are not in contact with the heat insulating container 6, so that they are hardly subjected to external force due to thermal deformation and the like, The effect that 1 can be comprised by a thin tube shape is acquired.

In the second embodiment, the ash melting furnace main body 1 has been described as being formed of a single ceramic tube. However, the present invention is not limited to this. For example, as shown in FIG. The main body 1 may be formed by bundling a plurality of ceramic tubes 1b, and the slag discharge portion 3a may be provided in the heat insulating container 6. In this case, the same effect as in the second embodiment can be expected. Here, FIG. 3 is a partial cross-sectional view showing the ash melting furnace main body 1 formed by bundling a plurality of ceramic tubes 1b. Needless to say, the shape and material of each member are not limited to those described above.

Further, in the second embodiment, the ash supply unit 2 is shown as being arranged such that its supply axis is perpendicular to the longitudinal center axis of the ash melting furnace main body 1. The present invention is not limited to this as long as the ash supplied to the melting furnace body 1 can turn and come into contact with the inner wall. For example, as shown in FIG. 4, the supply axis of the ash supply unit 2a may be disposed so as to be inclined with respect to the longitudinal center axis of the ash melting furnace main body 1, and as shown in FIG. The supply axis of the supply section 2b may be disposed so as to be parallel to the central axis in the longitudinal direction of the ash melting furnace main body 1. Also in these cases, the second embodiment is used.
The same effect as in the case of can be expected. This is the same for the other embodiments. Here, FIGS. 4 and 5
FIG. 4 is a cross-sectional view illustrating another arrangement position of the ash supply unit.

Embodiment 3 FIG. 6 is a sectional view showing an ash melting furnace according to Embodiment 3 of the present invention. In the following description, the same members as those already described are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 6, reference numeral 9 denotes the ash melting furnace main body 1 by burning a combustible pyrolysis gas (combustible gas) or other combustible gas (combustible gas) generated in the furnace facility in the heat insulating space 7. It is a combustion device that heats.

Next, the operation will be described. The ash supplied from the ash supply unit 2 to the ash melting furnace main body 1 is heated to a high temperature by the heating action of the combustion device 9 or by the heating action of both the heat source and the combustion device 9 supplied simultaneously with the ash, and is melted. It becomes molten slag 4. Insulating space 7
By the combustion heat obtained from the combustion device 9, the temperature is maintained at a higher temperature than in the case of the second embodiment. Note that other basic operations are the same as those in the second embodiment, and a description thereof will not be repeated.

As described above, according to the third embodiment, the combustion apparatus 9 capable of heating the ash melting furnace main body 1 from outside.
The effect similar to that of the second embodiment can be obtained, the heating performance of the ash of the ash melting furnace main body 1 is further improved, and the heat insulating space 7 is further heated by the combustion exhaust gas of the combustion device 9. Is maintained. as a result,
The effect of further reducing the amount of supply of fuel and the like to the ash melting furnace main body 1 can be obtained, for example, the time required for raising the temperature at the time of startup or the like can be further reduced, and the heat insulation performance of the ash melting furnace main body 1 can be improved.

Further, although one burner 9 is described as being provided in the heat insulating container 6, the present invention is not limited to this. A plurality of burners 9 may be provided, and the arrangement position is not limited to the illustrated example.

Embodiment 4 FIG. FIG. 7 is a sectional view showing an ash melting furnace according to Embodiment 4 of the present invention. In FIG. 7, reference numeral 8a denotes an exhaust provided at a position closer to the ash supply unit 2 than the gas discharge unit 5 of the ash melting furnace main body 1. Department.

Next, the operation will be described. After melting the ash in the ash melting furnace main body 1, the still high-temperature exhaust gas discharged from the gas discharge unit 5 flows through the heat insulating space 7 toward the ash supply unit 2, and is used for heating the heat insulating space 7. After that, it is discharged from the exhaust part 8a. That is, since the high-temperature exhaust gas discharged from the gas discharge unit 5 flows more reliably in the heat-insulating space 7, the heat-insulating space 7 can be maintained in a high-temperature state, so that the heat-insulating performance of the ash melting furnace main body 1 is improved. However, the amount of fuel or the like supplied to the ash melting furnace main body 1 can be reduced. In addition,
Other basic operations are the same as those in the above-described second embodiment, and a description thereof will not be repeated.

As described above, according to the fourth embodiment, since the exhaust portion 8a is provided at a position separated from the gas discharge portion 5 of the ash melting furnace main body 1, the exhaust gas discharged from the ash melting furnace main body 1 is provided. To the heat insulating space 7, and the heat insulating space 7 can be maintained at a higher temperature. As a result, the heat insulation performance of the ash melting furnace main body 1 is improved, and the effect of reducing the supply amount of fuel and the like to the ash melting furnace main body 1 is obtained.

In the fourth embodiment, the combustion device 9
However, it is needless to say that the same effect can be expected even when the combustion device 9 is not provided.

Embodiment 5 FIG. FIG. 8 is a sectional view showing an ash melting furnace according to Embodiment 5 of the present invention. In FIG. 8, reference numeral 8b denotes an exhaust portion provided near the gas exhaust portion 5. Further, the combustion device 9 is provided at a position closer to the ash supply unit 2 than the exhaust unit 8b.

Next, the operation will be described. When the ash melting furnace main body 1 is heated to a high temperature by the combustion device 9, the still high-temperature combustion exhaust gas generated after the heating flows through the adiabatic space 7 toward the gas discharge unit 5 and the slag discharge unit 3, and the exhaust unit 8b
Is discharged from Further, the exhaust gas discharged from the gas discharge part 5 is not guided to the heat insulating space 7 of the ash melting furnace main body 1,
It is easy to be discharged from the exhaust part 8b, so that heat is not taken from the ash melting furnace main body 1 and the heat insulating space 7, which are heated to a higher temperature by the heating of the combustion device 9. Therefore, the vicinity of the ash supply section 2 of the ash melting furnace main body 1 is maintained at a higher temperature, and the ash can be efficiently melted. Note that other basic operations are the same as those in the second embodiment, and a description thereof will not be repeated.

As described above, according to the fifth embodiment, since the exhaust portion 8b is provided near the gas discharge portion 5 of the ash melting furnace main body 1, the exhaust gas discharged from the gas discharge portion 5 is ash-dissolved. The exhaust part 8b is not guided to the heat insulating space 7 of the furnace body 1
From the ash melting furnace main body 1 and the heat insulating space 7 which are heated to a higher temperature by the heating of the combustion device 9. Therefore, the vicinity of the ash supply part 2 of the ash melting furnace main body 1 is maintained at a higher temperature, and an effect that the ash can be efficiently melted is obtained.

Embodiment 6 FIG. FIG. 9 is a partial sectional view showing an ash melting furnace according to Embodiment 6 of the present invention. In the sixth embodiment, a slag discharge section 3 is provided on the inner wall bottom surface 1a of the ash melting furnace main body 1, and the ash melting furnace main body 1 is inclined such that the slag discharge section 3 is located at an inclined lower side. .

Next, the operation will be described. The molten slag 4 that has been heated and melted at a high temperature flows down the inner wall bottom surface 1a smoothly toward the slag discharge section 3 by the action of gravity. Thereby, accumulation and clogging of the ash and the molten slag 4 in the ash melting furnace main body 1 can be prevented. Since other basic operations are the same as those in the above-described second embodiment,
Description is omitted.

As described above, according to the sixth embodiment, the molten slag 4 is removed by the action of gravity.
Therefore, the ash and the molten slag 4 in the ash melting furnace main body 1 can be effectively prevented from accumulating and clogging.

In the sixth embodiment, the cylindrical ash melting furnace main body 1 is inclined so that the inner wall bottom surface 1a
However, the present invention is not limited to this.For example, by installing the ash melting furnace body formed in a truncated cone shape horizontally, the inner wall bottom surface can be used as an inclined surface. In this case, the same effect as in the sixth embodiment can be expected. Further, if the angle of inclination of the ash melting furnace main body 1 from the horizontal in the sixth embodiment is set to 90 degrees, a so-called vertical ash melting furnace is obtained. Can be discharged efficiently. In this case, the gas discharge unit 5 is provided without providing the slag discharge unit 3.
The molten slag 4 may be discharged from the furnace, and the same effect can be expected.

Embodiment 7 FIG. FIG. 10 is a sectional view showing an ash melting furnace according to Embodiment 7 of the present invention. In FIG. 10, reference numeral 10 denotes a support member provided in the heat insulating container 6 and on which the ash melting furnace main body 1 is placed.

Next, the operation will be described. Since the ash melting furnace main body 1 is placed and supported on the support member 10, when the ash melting furnace main body 1 expands or contracts due to a temperature change, it is freely deformed in all directions except downward. it can. For the same reason, even when the entire heat insulating container 6 or the heat insulating container 6 in the ash supply unit 2 and the slag discharge unit 3 is deformed by expansion or contraction due to a temperature change, these are not ash melting furnace main bodies. It has no effect of deforming or destroying 1. Note that other basic operations are the same as those in the second embodiment, and a description thereof will not be repeated.

As described above, according to the sixth embodiment, the supporting member 10 on which the ash melting furnace main body 1 can be placed is provided, so that the ash melting furnace main body 1 is not located below the ash melting furnace main body due to a temperature change or the like. Can be freely deformed in all directions, preventing deformation and destruction due to an increase in compressive stress or tensile stress, and easily preventing breakage of the ash melting furnace main body 1 such as cracks. can get.

The shape and installation position of the support member 10
It is needless to say that the present invention is not limited to the illustrated one.

Embodiment 8 FIG. FIG. 11 is a sectional view showing an ash melting furnace according to Embodiment 8 of the present invention. In FIG. 11, reference numeral 11 denotes a support member provided in the heat insulating container 6 for suspending and supporting the ash melting furnace main body 1.

Next, the operation will be described. Since the ash melting furnace main body 1 is suspended and supported by the support member 11, when the ash melting furnace main body 1 expands or contracts due to a temperature change, it is freely deformed in all directions except upward. it can. Further, for the same reason, the entire heat insulating container 6 and the heat insulating container 6 in the ash supply unit 2 and the slag discharge unit 3
Even when the ash melting furnace is deformed due to expansion or contraction due to a temperature change, it does not exert an effect of deforming or breaking the ash melting furnace main body 1. Note that other basic operations are the same as those in the second embodiment, and a description thereof will not be repeated.

As described above, according to the eighth embodiment, the supporting member 11 for supporting the ash melting furnace main body 1 so as to be suspended in the heat insulating container 6 is provided. The furnace body 1 can be freely deformed in all directions except upward, preventing deformation and destruction due to an increase in compressive stress or tensile stress, and easily preventing breakage of the ash melting furnace body 1 such as cracks. The effect that can be obtained is obtained.

The shape and installation position of the support member 11
It is needless to say that the present invention is not limited to the illustrated one.

[0056]

As described above, according to the present invention, part or all of the ash melting furnace main body having the ash supply part, the slag discharge part, and the gas discharge part is fired in which the main component is silicon carbide. Since it is made of a ceramic material, there is an effect that the damage of the furnace body due to severe collision or erosion of ash or molten slag in a high temperature state can be reduced as compared with the conventional case. In addition, fired ceramic materials whose main component is silicon carbide generally have excellent thermal strength characteristics. Therefore, when the temperature is raised at the time of starting the ash melting furnace, the temperature rising rate is lower than in the conventional case. Therefore, the effect of shortening the time required for raising the temperature can be obtained.

According to the present invention, the ash melting furnace main body having the ash supply part, the slag discharge part, and the gas discharge part, and the ash melting furnace main body communicating with the gas discharge part of the ash melting furnace main body are included. In addition to forming the heat insulating space, the heat insulating space is provided with a heat insulating container having an exhaust portion for communicating the heat insulating space with the outside air, so that the heat insulating material is directly applied to the outer peripheral surface of the ash melting furnace as compared with the conventional case. Thus, the heat insulation performance of the ash melting furnace body is significantly improved. Therefore, it is possible to reduce the consumption of heat energy at the time of raising the temperature of the ash melting furnace, shorten the time required for the temperature rise, and suppress the loss of the heat energy even at the time of steady operation, thereby effectively melting the ash. Also,
The inner wall of the heat-insulated container only comes into contact with the exhaust gas that has passed through the gas discharge section, so there is little possibility of corrosion or deterioration. There is an effect that can be. In addition, through the heat insulating space, there is no need to directly insulate the high-temperature ash melting furnace main body from the outside air, and the amount of heat insulating material used for the heat insulating container can be reduced. Furthermore, since many parts of the ash melting furnace main body are not in contact with the heat insulating container, they are hardly subjected to an external force due to thermal deformation or the like, and have an effect that the ash melting furnace main body can be formed in a thin tube shape.

According to the present invention, since the combustion device for heating the ash melting furnace main body is provided in the heat insulating container, the heating performance of the ash content of the ash melting furnace main body is further improved, and the combustion exhaust gas of the combustion device is used. The insulated space is maintained at a higher temperature. As a result, it is possible to further reduce the amount of fuel or the like supplied to the ash melting furnace main body, for example, it is possible to further shorten the temperature rise time at the time of startup or the like and to improve the heat insulating performance of the ash melting furnace main body.

According to the present invention, an ash supply section is provided at one longitudinal end of the ash melting furnace main body, a gas discharge section is provided at the other end, and an exhaust section is provided near the ash supply section. With this configuration, the exhaust gas discharged from the ash melting furnace main body can be guided to the heat insulating space, and the heat insulating space can be maintained at a higher temperature. As a result, the heat insulation performance of the ash melting furnace main body is improved, and the amount of fuel or the like supplied to the ash melting furnace main body can be reduced.

According to the present invention, an ash supply section is provided at one end in the longitudinal direction of the ash melting furnace main body, a gas discharge section is provided at the other end, and an exhaust section is provided near the gas discharge section. Since the combustion device is arranged near the ash supply unit, the exhaust gas discharged from the gas discharge unit is not guided to the heat insulating space of the ash melting furnace main body, but is easily discharged from the exhaust unit, and the combustion is performed. Heat is not taken from the ash melting furnace body or the heat insulation space, which is heated to a higher temperature by heating the apparatus. Therefore, the vicinity of the ash supply part 2 of the ash melting furnace main body 1 is maintained at a higher temperature,
There is an effect that ash can be efficiently melted.

According to the present invention, a slag discharge portion is provided on the bottom surface of the inner wall of the ash melting furnace main body, and the ash melting furnace main body is installed such that the inner wall bottom surface is horizontal. Will stay for a relatively long time,
The ash content is reliably melted, and there is an effect that discharge of unmelted material can be effectively prevented.

According to the present invention, since the slag discharge portion is provided on the bottom surface of the inner wall of the ash melting furnace main body and the bottom surface of the inner wall is inclined such that the slag discharge portion is located below the slope, the effect of gravity is provided. Thereby, the molten slag can flow down smoothly toward the slag discharge portion, and there is an effect that accumulation and clogging of ash and molten slag in the ash melting furnace main body can be effectively prevented.

According to the present invention, since the supporting member on which the ash melting furnace main body is mounted is provided in the heat insulating container, the ash melting furnace main body can freely move in all directions except the downward direction due to a temperature change or the like. The ash melting furnace has the effect of being able to be deformed, preventing deformation and destruction due to an increase in compressive stress or tensile stress, and easily preventing breakage such as cracking of the ash melting furnace main body.

According to the present invention, since the supporting member for suspending the ash melting furnace main body is provided in the heat insulating container, the ash melting furnace main body is freely deformed in all directions other than upward with a temperature change or the like. Thus, there is an effect that deformation and destruction due to an increase in compression stress or tensile stress can be prevented, and breakage such as cracking of the ash melting furnace main body can be easily prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an ash melting furnace according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing an ash melting furnace according to Embodiment 2 of the present invention.

FIG. 3 is a partial sectional view showing an ash melting furnace main body formed by bundling a plurality of ceramic tubes.

FIG. 4 is a sectional view showing another arrangement position of the ash supply unit.

FIG. 5 is a sectional view showing another arrangement position of the ash supply unit.

FIG. 6 is a sectional view showing an ash melting furnace according to Embodiment 3 of the present invention.

FIG. 7 is a sectional view showing an ash melting furnace according to Embodiment 4 of the present invention.

FIG. 8 is a sectional view showing an ash melting furnace according to Embodiment 5 of the present invention.

FIG. 9 is a partial sectional view showing an ash melting furnace according to Embodiment 6 of the present invention.

FIG. 10 is a sectional view showing an ash melting furnace according to Embodiment 7 of the present invention.

FIG. 11 is a sectional view showing an ash melting furnace according to Embodiment 8 of the present invention.

FIG. 12 is a principle diagram showing a waste incineration system disclosed in Japanese Patent Publication No. 1-52654.

[Explanation of symbols]

1 Ash melting furnace main body, 2, 2a, 2b Ash supply section, 3, 3
a Slag discharge section, 4 molten slag, 5 gas discharge section, 6
Heat insulation container, 7 Heat insulation space, 8, 8a, 8b exhaust unit, 9
Combustion device, 10, 11 support member.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Yonezawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Seiichi Ohashi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd. (72) Inventor Satoshi Higashi Nakagawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Corporation (72) Inventor Michio Fujiwara 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric (72) Inventor Toshifumi Nakamura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (9)

[Claims] An ash melting furnace that introduces ash generated in a furnace facility, melts by heating, and discharges as molten slag. An ash supply section for introducing the ash, a slag discharge section for discharging the molten slag, and a slag discharge section. Ash melting characterized in that part or all of an ash melting furnace main body having a gas discharge portion for discharging exhaust gas generated during melting is made of a sintered ceramic material whose main component is silicon carbide (SiC). Furnace. 2. An ash melting furnace in which ash generated in a furnace facility is introduced, heated and melted, and discharged as molten slag, wherein an ash supply section for introducing the ash, a slag discharge section for discharging the molten slag, and a slag discharge section. An ash melting furnace main body having a gas discharge portion for discharging exhaust gas generated during melting, and an insulating space including the ash melting furnace main body communicating with the gas discharge portion of the ash melting furnace main body and forming the heat insulating space 2. The ash melting furnace according to claim 1, further comprising: a heat insulating container having an exhaust unit for communicating the space with the outside air. 3. The ash melting furnace according to claim 2, further comprising a combustion device for heating the ash melting furnace main body by burning the combustible gas generated in the furnace facility in the adiabatic space. 4. An ash supply unit is provided at one longitudinal end of the ash melting furnace main body, a gas exhaust unit is provided at the other end, and an exhaust unit is provided near the ash supply unit. The ash melting furnace according to claim 2 or 3, wherein 5. An ash supply unit is provided at one longitudinal end of the ash melting furnace main body, and a gas discharge unit is provided at the other end, and an exhaust unit is provided near the gas discharge unit. 4. The ash melting furnace according to claim 3, wherein a combustion device is provided near the portion. 6. The ash melting furnace main body according to claim 1, wherein a slag discharge portion is provided on an inner wall bottom surface of the ash melting furnace main body, and the ash melting furnace main body is installed such that the inner wall bottom surface is horizontal. The ash melting furnace according to any one of the preceding claims. 7. The ash melting furnace main body according to claim 1, wherein a slag discharge portion is provided on the bottom surface of the inner wall, and the bottom surface of the inner wall is inclined so that the slag discharge portion is located on the lower side. 6. The ash melting furnace according to claim 5. 8. The ash melting furnace according to claim 1, wherein a supporting member on which the ash melting furnace main body is mounted is provided on the heat insulating container. 9. The ash melting furnace according to claim 1, wherein a supporting member for suspending the ash melting furnace main body is provided in the heat insulating container.