JP2004216303A - Method and apparatus for making effective use of slag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for making effective use of slag, each of which is applied to wastes disposal equipment for disposing wastes into molten slag like an ash melting furnace or a gasifying/melting furnace placed side by side with a waste incinerator for burning wastes such as general waste and industrial waste and in which fine-grained slag can be also used effectively. <P>SOLUTION: This apparatus for making effective use of slag is provided with a crusher 12 for crushing the molten slag C, a sieving machine 13 for sorting the slag crushed by the crusher 12, and a pneumatic conveying means 14 for blowing the fine-grained slag D pneumatically to inlets of bag filters 4, 10 being exhaust gas treatment facilities of the incinerator 2 and the melting furnace 6 so that the fine-grained slag D obtained by crushing the slag C is used in the bag filters 4, 10 as a reaction assistant B. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides, for example, a refuse incinerator for incinerating refuse such as general waste or industrial waste, which is provided with an ash melting furnace, or a refuse treatment facility for processing refuse like a gasification melting furnace to form slag. The present invention relates to a method of effectively using slag applied to a device and an improvement of the device.
[0002]
[Prior art]
In general, there are refuse treatment facilities that combine ash with a refuse incinerator and gasification and melting furnaces. For example, those shown in FIG. 3 are known (see Patent Documents 1 to 7).
[0003]
The refuse treatment equipment 50 includes an incinerator 51 for incinerating refuse, a waste heat boiler 52 for recovering heat of exhaust gas discharged from the incinerator 51, and a bag filter 53 for collecting fly ash contained in the exhaust gas from now on. And an induction ventilator 54 for inducing future exhaust gas, a chimney 55 for discharging future exhaust gas to the atmosphere, a melting furnace 56 for melting incineration ash from the incinerator 51 and fly ash from the back filter 53, A combustion chamber 57 for burning the future exhaust gas, a cooling tower 58 for reducing the temperature of the future exhaust gas, a bag filter 59 for collecting molten fly ash contained in the future exhaust gas, and an exhaust gas for the future. And an induction ventilator 60 for discharging from the chimney 55.
The bag filters 53 and 59 serve as dry exhaust gas treatment equipment for the incinerator 51 and the melting furnace 56. At the inlet side, an alkali agent (neutralizing agent) A such as slaked lime and a reaction assistant B are put together. Supplied. The alkaline agent A is supplied to neutralize the exhaust gas to the bag filters 53 and 59. The reaction aid B is added to suppress an increase in pressure loss on the bag filters 53 and 59 and to increase the efficiency of removing acidic gas.
[0004]
Thus, the waste treatment equipment 50 includes a crusher 61 for crushing the molten slag C from the melting furnace 56 and a sieving machine 62 for separating the slag from the slag into fine slag D and other coarse slag E. Have. The sieving machine 62 has a mesh of 0.075 mm.
The coarse slag E on the sieve larger than the sieve separated by the sieving machine 62 is effectively used for roadbed material and the like, and the fine slag D under the sieve smaller than the sieve is landfilled.
[0005]
[Patent Document 1]
JP-A-56-115401 [Patent Document 2]
JP-A-7-204604 [Patent Document 3]
Japanese Patent No. 3146919 [Patent Document 4]
Japanese Patent Application Laid-Open No. 10-77602 [Patent Document 5]
JP-A-10-227431 [Patent Document 6]
JP 2000-205536 A [Patent Document 7]
JP 2001-276774 A
[Problems to be solved by the invention]
In short, the molten slag generated from the melting furnace is crushed by a crusher in order to use it effectively for roadbed materials, etc., but the fine slag generated at that time was removed because it could be scattered. There was no use to use.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in order to solve the above problems. In providing the device.
[0008]
[Means for Solving the Problems]
The method for effectively utilizing the slag of the present invention is basically such that fine slag formed after crushing the molten slag is used as a reaction aid in a waste filter and a back filter which is an exhaust gas treatment facility of the melting furnace. There is a characteristic in the thing.
[0009]
The slag effective utilization device of the present invention is a crusher for crushing molten slag, a sieving machine for separating slag from the slag, and a fine filter slag for the garbage incinerator and a Baku filter which is an exhaust gas treatment facility of a melting furnace. It has a feature in that it is provided with a pneumatic transportation means that blows into the inlet side.
[0010]
The molten slag from the melting furnace is crushed by a crusher and then separated into fine slag and coarse slag by a sieving machine. Coarse-grain slag is effectively used for roadbed materials and the like as in the past. The fine slag is blown together with an alkali agent as a reaction aid into the inlet side of a back filter which is an exhaust gas treatment facility of an incinerator and a melting furnace by an air transport means. Therefore, fine-grain slag conventionally disposed in landfill can be effectively used as a reaction aid. As a result, the cost of the reaction aid can be reduced.
[0011]
Preferably, the fine slag is further pulverized. By doing so, it is possible to improve the wiping property of the bag filter on the filter cloth and the reactivity of the alkali agent.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a waste treatment facility suitable for adopting the slag effective use method according to the first example of the present invention.
[0013]
The refuse treatment facility 1 includes an incinerator 2 for incinerating refuse, a waste heat boiler 3 for recovering heat of exhaust gas discharged from the incinerator, and a bag filter 4 for collecting fly ash contained in the exhaust gas from now on. An induction ventilator 5 for inducing future exhaust gas, a chimney 6 for discharging the future exhaust gas to the atmosphere, a melting furnace 7 for melting incineration ash from the incinerator 2 and fly ash from the back filter 4, Combustion chamber 8 for combusting exhaust gas, temperature-reducing tower 9 for decreasing the temperature of the exhaust gas from now on, bag filter 10 for collecting molten fly ash contained in the exhaust gas from now on, and inducing exhaust gas from the future And an induction ventilator 11 for discharging air from the chimney 6.
[0014]
Thus, the refuse treatment facility 1 includes a crusher 12 for crushing the molten slag C from the melting furnace 7, a sifter 13 for separating the slag from the slag into fine slag D and other coarse slag E, Pneumatic transport means 14 for blowing fine slag D together with alkaline agent A at each inlet side of Bak filters 4 and 10 which are dry exhaust gas treatment facilities of the incinerator 2 and the melting furnace 7 are provided. This is a so-called slag effective utilization device.
[0015]
The sieving machine 13 uses a sieve having a sieve mesh of 0.075 mm, and a fine slag D smaller than this is separated below the sieve, and a coarse slag E larger than this is separated above the sieve. ing.
[0016]
Although not shown, the pneumatic transport means 14 includes a silo for storing the fine slag D from the sieving machine 13, a quantitative feeder for sending out the fine slag D stored here in a constant amount, and a fine granule from this. A duct for guiding the slag D to the inlet sides (inlet ducts) of the bag filters 4 and 10 of the incinerator 2 and the melting furnace 7, and a blower through which fine slag D is pneumatically transported and blown to the inlet sides of the bag filters 4 and 10. Etc. are provided.
[0017]
Next, the operation will be described based on such a configuration.
The garbage is put into the incinerator 2 and incinerated. Exhaust gas from the incinerator 2 is heat-recovered by the waste heat boiler 3, and fly ash (dust, solid compounds and heavy metals) contained therein is collected by the bag filter 4. Exhaust gas from the bag filter 4 is induced by the induction ventilator 5 and discharged from the chimney 6 to the atmosphere.
The incinerated ash discharged from the incinerator 2 and the fly ash from the back filter 4 are sent to a melting furnace 7 where they are melted. Exhaust gas from the melting furnace 7 is burned by the combustion chamber 8 and cooled by the cooling tower 9, and the molten fly ash contained therein is collected by the bag filter 10. Exhaust gas from the bag filter 10 is induced by the induction ventilator 11 and discharged from the chimney 6 to the atmosphere.
[0018]
The molten slag C discharged from the melting furnace 7 is crushed by the crusher 12 and then separated into fine slag D on the sieve and coarse slag E under the sieve by the sieving machine 13. Coarse-grain slag E is effectively used as a roadbed material or the like as in the related art. The fine slag D is blown together with the alkaline agent A as a reaction aid B into the inlet side of Bak filters 4 and 10 which are exhaust gas treatment facilities of the incinerator 2 and the melting furnace 7 by the pneumatic transportation means 14.
[0019]
By the way, when an alkaline agent A such as slaked lime is used in a dry-type exhaust gas treatment facility, a reaction aid B is used to suppress an increase in pressure loss on a filter and to increase the efficiency of acid gas removal. I often do.
As the reaction aid B, those mainly composed of silicon (Si) and aluminum (Al) are used. On the other hand, the fine slag D obtained by crushing and sieving the molten slag C is mainly composed of silicon (Si), aluminum (Al), and calcium (Ca), and is glassy. It can be used because it has similar physical properties to commonly used reaction auxiliaries, such as lack of hygroscopicity.
Therefore, the fine slag D which has conventionally been landfilled can be effectively used as the reaction aid B. As a result, the cost of the reaction aid can be reduced.
[0020]
Next, a second example of the present invention will be described with reference to FIG.
FIG. 2 is a schematic diagram showing a refuse treatment facility suitable for adopting the slag effective use method according to the second example of the present invention.
[0021]
The second example is different from the first example in that a crusher 15 for finely crushing the fine slag D is provided between the sieving machine 13 and the pneumatic transportation means 14, and the other is the same as the first example. is there.
The crusher 15 crushes the fine slag D from the sieving machine 13 to an average of about 20 to 30 μm.
In such a case, since the fine slag D is finer, it is possible to improve the wiping property of the bag filters 4 and 10 on the filter cloth and the reactivity of the alkaline agent A.
[0022]
In the above example, the sieving machine 13 has a sieve mesh of 0.075 mm, but is not limited thereto, and may have another size, for example.
In the above example, the pneumatic transportation means 14 includes a silo, a fixed-quantity supply device, a duct, a blower, and the like, but is not limited thereto, and may have another structure, for example.
[0023]
【The invention's effect】
As described above, according to the present invention, the following excellent effects can be obtained.
(1) The fine slag produced after crushing the molten slag is used as a reaction aid in a back filter which is an exhaust gas treatment facility of an incinerator and a melting furnace, so that the fine slag can be effectively used.
(2) Since fine slag is used as a reaction aid, the cost of the reaction aid can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a waste treatment facility suitable for adopting a slag effective use method according to a first example of the present invention.
FIG. 2 is a schematic diagram showing a waste treatment facility suitable for adopting a slag effective use method according to a second example of the present invention.
FIG. 3 is a schematic diagram showing a conventional waste treatment facility.
[Explanation of symbols]
1,50: Waste treatment equipment, 2,51: Incinerator, 3,52: Waste heat boiler, 4,10,53,59 ... Bag filter, 5,11,54,60 ... Induced ventilator, 6,55 ... Chimney, 7,56 melting furnace, 8,57 combustion chamber, 9,58 cooling tower, 12,61 crusher, 13,62 sieving machine, 14 air transport means, 15 crusher, A ... Alkali agent, B ... Reaction aid, C ... Molten slag, D ... Fine slag, E ... Coarse slag.

Claims (3)

A method for effectively utilizing slag, characterized in that fine slag formed after crushing molten slag is used as a reaction aid in a back filter which is an exhaust gas treatment facility of an incinerator and a melting furnace. The effective use method of the slag according to claim 1, wherein the fine slag is further pulverized. A crusher for crushing the molten slag, a sieving machine for separating the slag from now on, and pneumatic transport means for blowing fine slag from here on the inlet side of a back filter which is an exhaust gas treatment facility of an incinerator and a melting furnace are provided. An effective slag utilization device that is characterized by

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