JP2996957B1 - Melting equipment for incineration ash - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide an exhaust fan for dust collection in an incineration ash melting treatment device, to make exhaust gas from a melting furnace harmless, and to use a fuel such as coke. To be able to reduce the amount of used. SOLUTION: A melting furnace 1 for melting incineration ash H, and a melting furnace blower 47 for sending coke combustion air to the melting furnace 1 are provided. The downstream side of the in-furnace dust collecting duct 38 that sucks the exhaust gas discharged from the melting furnace 1 is connected to the suction port of the melting furnace blower 47 in communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an incineration ash melting apparatus.

[0002]

2. Description of the Related Art Ash (incinerated ash) discharged from a garbage incinerator or the like sometimes contains harmful substances, and in such a case, it cannot be disposed of in a landfill. Conventionally, as a melting treatment device for detoxifying and reducing the volume of such incinerated ash, for example, a melting furnace for melting incinerated ash, and a melting furnace blower for sending coke combustion air to the melting furnace. A combustion chamber for burning exhaust gas from the melting furnace, a heat exchanger for exchanging cold air for hot air with heat from the combustion chamber, and a dust collector for sucking gas from the heat exchanger and collecting dust,
It has been proposed that a downstream side of a duct for sucking exhaust gas from a slag port of a melting furnace is connected to a downstream side of a heat exchanger.

[0003]

However, in the above-described conventional incineration ash melting processing apparatus, when the dust collecting capability of the dust collector is reduced, the exhaust gas suction force from the melting furnace is reduced, and the material is not discharged from the material inlet. Since the exhaust gas leaks, a high-output dust extractor is required. Further, when unburned gas is contained in the gas discharged from the slag port in front of the furnace, the unburned gas cannot be reburned, and harmful gas may be discharged. Furthermore, the melting efficiency of incinerated ash is poor,
A lot of fuel such as coke was needed.

Accordingly, the present invention solves the above-mentioned problems, and allows the exhaust fan for dust collection to have extra power, to make the exhaust gas from the melting furnace harmless, and to further reduce incineration ash. An object of the present invention is to provide an incineration ash melting apparatus capable of improving the melting efficiency and reducing the amount of fuel such as coke.

[0005]

In order to achieve the above object, an apparatus for melting incinerated ash according to the present invention comprises: a melting furnace for melting incinerated ash; and a melting furnace for feeding coke combustion air to the melting furnace. And a furnace blower, wherein the downstream side of the dust collecting duct in front of the furnace for sucking exhaust gas discharged from the slag port of the melting furnace communicates with the suction port of the melting furnace blower. It is a concatenation.

[0006] Further, in a melting processing apparatus for incineration ash provided with a melting furnace for melting the incineration ash and a melting furnace blower for sending air for coke combustion to the melting furnace, a slag outlet of the melting furnace is provided. The downstream side of the dust collection duct in front of the furnace for sucking the exhaust gas discharged from the furnace is connected to the suction port of the melting furnace blower, and the outside air suction port and the intake of the outside air are provided in the middle of the dust collection duct in front of the furnace. An opening / closing unit for opening and closing the opening is provided, and a control unit for detecting the outlet temperature of the melting furnace blower and controlling the opening / closing of the opening / closing unit is further provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 schematically shows an incineration ash melting apparatus according to the present invention. The incineration ash melting apparatus includes a melting furnace 1, a combustion chamber 8 for burning exhaust gas from the melting furnace 1, and a combustion chamber 8.
A heat exchanger 9 for generating hot air by the heat of the high-temperature exhaust gas from the combustion chamber 8 and a melting furnace blowing means 34 for feeding coke combustion air to the melting furnace 1 are provided. The incineration ash is melted using waste plastic (FRP) as a fuel, and the incineration ash is rendered harmless and reduced in volume. Waste plastics are generated during the molding of various types of plastics. The incinerated ash is made into small particles having a substantially elliptical sphere, and the waste plastics are made into powder.

As shown in FIGS. 2 and 3, the melting furnace 1 has a cylindrical furnace body 2 whose lower end portion is gradually reduced in diameter, and a lower opening of the cylindrical furnace body 2 is covered with a lid. A hearth 3 to be filled, a charging cylinder 4 connected to an upper opening of the furnace body 2,
Is provided. That is, the lower end portion of the cylindrical furnace body 2 is a coke burning section 5 into which coke C is charged, and an upper portion thereof is an incinerated ash melting section into which incinerated ash compacted into a substantially elliptical sphere is charged. The upper part is an exhaust gas combustion part 7 for reburning the exhaust gas CO.

That is, the first air passage 10 to which the hot air is supplied is connected to the coke combustion unit 5. By the way, each air passage 10 includes a wind box 13 arranged along the outer periphery of the furnace main body 2 and a tuyere conduit 16 for communicating and connecting each wind box 13 with the furnace main body 2. Hot air is supplied to the blowing passage 10 from a melting furnace blowing means 34 described in detail later (see FIG. 1).

An opening in the coke combustion section 5 of the air passage 10, that is, a tuyere 37, is disposed near the inclined surface 17 of the hearth 3 having an inclined surface 17. By the way, hearth 3
The bottom has a hole portion 18 having the inclined surface 17, and a slag port 19 is opened at the lower end side of the inclined surface 17.

In this case, a plurality of hearths 3 (in the illustrated example, 2
), And each hearth 3 is slidable via slide means (not shown) so that switching is possible. The slide means includes, for example, a guide rail, wheels running on the guide rail, a drive mechanism for rotating the wheels, and the like.

A connecting pipe section 20 connected to a communication pipe 23 connected to the combustion chamber 8 is formed at an upper portion of the furnace main body 2. Note that a refractory material 21 is coated on the inner surface of the water cooling jacket or the furnace main body 2 on the inner surface of the connecting pipe portion 20. Further, a water-cooled jacket portion 22 is formed on the outer peripheral side of the coke combustion portion 5. Further, at an upper portion of the exhaust gas combustion section 7, an air inlet 12a for ejecting exhaust gas combustion air downward is provided. In other words, the exhaust gas combustion air supply pipe 46 for supplying the exhaust gas combustion air is connected to the exhaust gas combustion section 7 via the valves 36, 36 and the air blowing pipes 12, 12.

More specifically, two air injection pipes 12 are fixed to the upper wall of the furnace body 2 in a penetrating manner, and the air injection pipes
The tips of 12, 12 project downward from the inner surface of the upper wall of the exhaust gas combustion section 7. In other words, the air inlets 12 of the air
a, 12a are opened downward at the upper part of the exhaust gas combustion part 7.

Further, the melting treatment apparatus includes a waste plastic supply means 40 for supplying powdery waste plastic P to the coke combustion unit 5. The waste plastic supply means 40 includes a storage tank for storing the powdery waste plastic P, and a cyclone to which the powdery waste plastic P in the storage tank is supplied via a transport air path. Then, the powdery waste plastic P in the storage tank is supplied to the cyclone together with the transport air in the transport air path, and is supplied from the cyclone to the tuyere conduit 16 via a pipe. The hot air supplied to the conduit 16 is supplied to the coke burning section 5 of the melting furnace 1.

As described above, the first air passage 10 supplies hot air for burning the coke C and the waste plastic P to the coke combustion section 5.

Next, the charging cylinder 4 includes an insertion portion 24 inserted into the upper opening of the furnace body 2 and a charging portion 26 into which the incineration ash H is charged from the charging bucket 25. 26, a damper 27 is provided. The damper 27 includes a cone portion 28,
A vertical holding rod 29 for holding the cone portion 28, a horizontal holding rod 30 for holding the vertical holding rod 29, and cylinders 31 and 31 attached to the outer surface of the loading section 26 for vertically moving the horizontal holding rod 30; Is provided. Further, a material input port environment dust collecting portion 33 connected to a communication pipe 32 connected to the heat exchanger 9 is formed in the input cylinder 4 (see FIG. 3).

[0025] (Returning to FIG. 1) The melting furnace blowing means 34 includes a melting furnace blower (main blower) 47 and an exhaust gas discharged from the slag port 19 of the melting furnace 1 to the blower 47. A dust collection duct 38, an outside air suction port 39 provided in the middle of the front dust collection duct 38, an opening / closing section 41 for opening and closing the outside air suction port 39, and an opening / closing section for detecting an outlet temperature of the melting furnace blower 47.
A control means 42 for controlling the opening and closing of the heat exchanger 9; a first pipe 43 for sending air from the melting furnace blower 47 to the heat exchanger 9; a branch pipe 11 from the first pipe 43; Combustion air supply pipe 48 that sends coke combustion air A to
A second pipe 44 connected to the coke combustion air supply pipe 48, a third pipe 45 branched from the first pipe 43,
And an exhaust gas combustion air supply pipe 46 for sending exhaust gas combustion air B from the third pipe 45 to the exhaust gas combustion section 7 of the furnace body 2.

That is, the downstream side of the in-furnace dust collecting duct 38 for sucking the exhaust gas discharged from the melting furnace 1 is connected to the suction port of the melting furnace blower 47 in communication. A dust collection hood 54 is provided at the upstream end of the dust collection duct 38 in front of the furnace. Further, the heat exchanger 9
A dust collector (not shown) is connected through a communication pipe 53 to the downstream side of the dust collector. Reference numeral 51 denotes a cooling air fan that sends cooling air to the combustion chamber 8 via a communication pipe, and reference numeral 52 denotes a combustion air fan that sends combustion air to the combustion chamber 8 via a communication pipe.

The air A for coke combustion, the air B for exhaust gas combustion, the air M for dust collection in front of the furnace, the air D for environmental dust collection at the material inlet, the gap suction air E for material input, and the combustion Assuming that the chamber combustion air F and the combustion chamber cooling air G are sucked at 100%, the air M for dust collection in front of the furnace corresponds to about 7%.

With the above configuration, a part of the exhaust gas discharged from the melting furnace 1 (ie, the exhaust gas from the slag port 19) is sucked into the furnace again. It can be completely burned, made harmless and safely treated. In addition, the capacity of the blower of the dust collector can be given extra power, and exhaust gas from the melting furnace 1 can be completely sucked. Therefore, safe and stable operation can be performed. Moreover, since the heat of the exhaust gas can be recovered and reused, the efficiency of dissolving the incinerated ash can be improved and the amount of fuel such as coke can be reduced. Further, the discharge temperature of the melting furnace blower 47 can be automatically adjusted, and the melting process can be performed in an optimum state.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The incineration ash melting apparatus shown in FIGS. 1 to 3 was actually manufactured, and the apparatus was operated to reduce the coke combustion rate, the hot air recovery temperature for coke combustion, and the melting furnace blower. The discharge temperature was measured. In addition, the same measurement was performed for a conventional incineration ash melting apparatus. The results are shown in Table 1 below.

[0023]

[Table 1]

As is apparent from Table 1 above, the discharge temperature
In both Example 1 in which the temperature was set to 60 ° C. and Example 2 in which the discharge temperature was set to 140 ° C., the amount of coke combustion was reduced and the hot air recovery temperature for coke combustion was lower than in the conventional example. It is rising. In particular, in Example 2, the rate of decrease in the amount of coke combustion was as large as 2.8%. It should be noted that even when the discharge temperature was set to be higher than 140 ° C., the rate of decrease in the amount of coke combustion hardly changed. This is considered because the heat exchange efficiency of the heat exchanger is reduced.

[0025]

Since the present invention is configured as described above, the following effects can be obtained.

According to the incineration ash melting treatment apparatus of the first aspect, the exhaust gas can be rendered harmless and safely treated. In addition, the capacity of the blower of the dust collector can be given a surplus, and the exhaust gas from the melting furnace 1 can be completely sucked. Therefore, safe and stable operation can be performed without exhaust gas leakage. In addition, since the heat of the exhaust gas can be recovered and reused, the efficiency of dissolving the incinerated ash can be improved and the amount of fuel such as coke can be reduced.

According to the incineration ash melting apparatus of the second aspect, the exhaust gas can be rendered harmless and safely processed. In addition, the capacity of the blower of the dust collector can be given extra power, and exhaust gas from the melting furnace 1 can be completely sucked. Therefore, safe and stable operation can be performed without exhaust gas leakage. Moreover, since the heat of the exhaust gas can be recovered and reused, the efficiency of dissolving the incinerated ash can be improved and the amount of fuel such as coke can be reduced. In addition, the melting furnace blower
The discharge temperature of 47 can be automatically adjusted, and the melting process can be performed in an optimal state. That is, the operation can be performed in a state where the coke combustion amount is minimized, and the operation cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a simplified diagram showing one embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a melting furnace.

FIG. 3 is a side view of a main part of the melting furnace.

[Explanation of symbols]

 1 Melting furnace 38 Dust collection duct in front of furnace 39 Outside air intake 41 Opening / closing part 42 Control means 47 Melting furnace blower H Incineration ash

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirotoshi Murata 5-1-1, Ageocho, Yao City, Osaka Prefecture Inside Naniwa Furnace Research Laboratory Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F23J 1/00 B09B 3/00 F23C 9/00 F23G 7/12

Claims (2)

(57) [Claims] 1. A melting furnace 1 for melting incineration ash H, a melting furnace blower 47 for feeding coke combustion air to the melting furnace 1,
At a melt processing apparatus ash having a of the melting furnace 1
A melting apparatus for incinerated ash, wherein a downstream side of a dust collection duct 38 in front of a furnace for sucking exhaust gas discharged from a slag port 19 is connected to a suction port of the melting furnace blower 47. 2. A melting furnace 1 for melting the incineration ash H, a melting furnace blower 47 for feeding coke combustion air to the melting furnace 1,
At a melt processing apparatus ash having a of the melting furnace 1
The downstream side of the dust collection duct 38 in front of the furnace for sucking the exhaust gas discharged from the slag port 19 is connected to the suction port of the blower 47 for the melting furnace, and an outside air suction port is provided in the middle of the dust collection duct 38 in front of the furnace. 39 and an opening / closing part 41 for opening and closing the outside air inlet 39 are provided.
The outlet temperature of the melting furnace blower 47 is detected and the opening / closing section 41 is detected.
A melting device for incinerated ash, comprising a control means 42 for controlling the opening and closing of the incineration ash.