JPH11188337A - Dechlorination apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dechlorination apparatus which decomposes dioxins into harmless compounds by removing chlorine from dioxins contained in incineration ash, fly ash, and others discharged from incineration facilities and others. SOLUTION: An apparatus is applied to an incineration facility equipped with an incineration furnace 2, a dust collecting apparatus 4, and a stack 6 and equipped with a cylindrical dechlorination tank 12 in which inner wall surface 13 for charging a material B to be dechlorinated is a heating surface, a jacket 14 which is arranged around the dechlorination tank 12 and in which a heating medium H for heating the inner wall surface 13 of the tank 12 is introduced, and a fuidization means 15 for fluidizing the material B charged in the tank 12. The material B is dechlorinated by heating it indirectly in the absence of oxygen in the tank 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dechlorination apparatus for performing a dechlorination treatment for removing chlorine from dioxins contained in incinerated ash and fly ash, and for decomposing and detoxifying the dioxins. .

[0002]

2. Description of the Related Art As is well known, various types of garbage discharged from households and factories are removed from reusable and non-incinerated materials and then incinerated at incineration facilities. In recent years, pollution of the environment by dioxins generated when incinerating garbage has become a problem.

[0003] The generation of dioxins in the above incineration facilities is caused by a large amount of carbon monoxide, polyvinyl chloride, etc., generated when the incinerator burned in the incinerator is in an incomplete combustion zone (300 to 600 ° C). The chlorine generated when the organic chlorine compound burns causes an oxidation reaction with a benzene nucleus in which carbon and hydrogen are bonded.

Therefore, in order to prevent the generation of dioxins in the incineration facility, it is conceivable that organic chlorine compounds, such as polyvinyl chloride, which generate chlorine during combustion, are previously removed from the incinerated material so as not to be incinerated. Since it is practically impossible to remove organochlorine compounds such as polyvinyl chloride mixed in incinerated materials from incinerated materials, at present, monoxide indispensable for the generation of dioxins in incinerated facilities Preventing the generation of carbon, that is, reducing the temperature in the incinerator to the full combustion temperature of 80
It has been considered to prevent the generation of dioxins in the incinerator by keeping the temperature at 0 ° C. and completely burning the incinerated material to prevent the generation of carbon monoxide.

[0005] However, even if the inside of the incinerator is maintained at 800 ° C., which is the complete combustion temperature, since the incineration material to be introduced into the incinerator is at room temperature, the incomplete combustion temperature range (30 ° C.)
(0 to 600 ° C.), the temperature reaches a complete combustion temperature of 800 ° C., and as a result, carbon monoxide is generated when the incinerated material passes through the above incomplete combustion temperature range, and particularly contains a large amount of moisture. In the case of incinerated materials containing garbage etc., the time required to pass through the incomplete combustion temperature range is prolonged, so carbon monoxide is easily generated and the possibility of generating dioxins is increased. Even if the internal temperature is maintained at the complete combustion temperature, the generation of dioxins cannot be completely prevented.

In order to detoxify dioxins once generated in the incinerator in the incinerator, the temperature in the incinerator must be raised to 1250 to 1400 ° C. In practice, it is impossible in terms of facilities and running costs, and in this case, too, it is not possible to completely prevent the generation of dioxins in the incinerator.

[0007] Dioxins generated in the incinerator are discharged in a state of being included in incineration ash and fly ash collected by a dust collector, and the incineration ash and fly ash containing these dioxins are discharged. Has been disposed of at the final disposal site,
Environmental pollution due to dioxins discharged from incinerated ash and fly ash containing dioxins discarded at the final disposal site has become a problem, and also contains dioxins and dioxins that cannot be collected by the above dust collector. Fine fly ash is released into the atmosphere together with the exhaust gas, and dioxins released into the atmosphere and environmental pollution due to the fine fly ash containing dioxins have been pointed out as a serious problem.

Therefore, in order to decompose and detoxify the dioxins contained in the above incinerated ash and fly ash, the incinerated ash and fly ash containing dioxins are vitrified at about 1250 to 1450 ° C. A detoxifying melt-solidification treatment has been proposed and is actually performed, and incinerated ash and fly ash containing dioxins are heated to 350 to 550 ° C. in an atmosphere having an oxygen content of 1% or less (oxygen-free state). As a result, dechlorination has been proposed in which chlorine is removed from dioxins contained in incinerated ash and fly ash to decompose and detoxify the dioxins, and this is also actually performed.

[0009] In order to prevent environmental pollution due to dioxins and fine fly ash containing dioxins released into the atmosphere together with the exhaust gas from the incineration facility, it is contained in the exhaust gas discharged from the incineration facility. BACKGROUND ART Dioxins and fine fly ash containing dioxins are adsorbed by activated carbon.

[0010]

According to the above prior art, it is possible to detoxify dioxins contained in incinerated ash and fly ash discharged from incineration facilities and the like, but incinerated ash containing dioxins can be achieved. And fly ash about 1250-1450
In the case of the melt-solidification treatment of detoxifying dioxins by vitrification at ℃, the processing cost is high because of the huge amount of energy required, and incineration ash or fly ash containing dioxins is also required. When heat treatment is performed in an oxygen-free state, a long time is required for the treatment, so that the treatment cost increases and dioxins cannot be detoxified efficiently. As a result, dioxins Most of the incinerated ash and fly ash containing ash are discarded at the final disposal site as they are, and there is a concern about the environmental pollution due to the outflow of dioxins.

In addition, dioxins and fine fly ash containing dioxins contained in exhaust gas discharged from incineration facilities and the like are adsorbed on activated carbon, so that dioxins and fine fly ash containing dioxins are absorbed. Although the emission of ash into the atmosphere can be prevented, the activated carbon temporarily absorbs dioxins and fine fly ash containing dioxins to meet the emission standards for dioxins in incineration facilities. In many cases, environmental pollution due to the release of dioxins and fine fly ash containing dioxins into the atmosphere cannot be fundamentally solved, and it also contains dioxins and dioxins. Activated carbon that has absorbed fine fly ash, like incinerated ash and fly ash, is also directly discarded at the final disposal site. Environmental pollution caused by runoff of the kind have been feared.

[0012]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to incinerate ash or fly ash containing dioxins discharged from an incineration facility or the like. Chlorine can be removed from dioxins contained in activated carbon adsorbed with ash or dioxins and fine fly ash containing dioxins to decompose and detoxify dioxins, and at low processing cost and efficiency To provide a good dechlorination apparatus.

[0013]

In order to achieve the above object, the present invention has the following technical means. That is, using the reference numerals used in the accompanying drawings corresponding to the embodiment, the incinerator 2 and a dust collecting device 4 for collecting fly ash in the exhaust gas G discharged from the incinerator 2 and a dust collecting device 4 A cylindrical dechlorination tank 12 which is applied to the incineration facility 1 provided with the chimney 6 which discharges the exhaust gas G passing through the air into the atmosphere, and has a heat transfer surface on the inner wall surface 13 into which the dechlorinated substances B are charged; A jacket 14 which is disposed around the dechlorination tank 12 and into which a heating medium H for heating the inner wall surface 13 of the dechlorination tank 12 is introduced; A dechlorination apparatus comprising a flow means 15 for flowing B, and indirectly heating the dechlorinated substance B in the dechlorination tank 12 in an oxygen-free state, thereby performing a dechlorination treatment of the dechlorinated substance B. 11, an inner wall surface 1 serving as a heat transfer surface of a dechlorination tank 12 of the dechlorination apparatus 11
The heating medium H for heating the gas is exhaust gas G discharged from the incinerator 2 of the incineration facility 1 and discharged into the atmosphere from the chimney 6, and the inner wall 13 of the dechlorination tank 12 is maintained at a predetermined temperature. And is introduced into the jacket 14 via a heating medium introduction pipe 35 connected to an arbitrary position of the exhaust gas passage 31 extending from the downstream side of the incinerator 2 to the upstream side of the chimney 6. After being introduced into the exhaust gas passage 31, it is returned to the downstream side from the take-out position from the exhaust gas passage 31.
The dechlorinated product B is disposed downstream of the dust collector 4 to collect dioxins and fine fly ash containing dioxins in the exhaust gas G passing through the dust collector 4. Dioxins and fine fly ash containing dioxins that are collected by the secondary dust collecting device 7 that can be collected. Certain dioxins and fine fly ash containing dioxins are indirectly heated in the dechlorination tank 12 in an oxygen-free state as dechlorinated substances B, and dechlorinated substances C obtained by dechlorination are dechlorinated. By chlorine substance input means 51,
This is a dechlorination device which is charged upstream of the secondary dust collector 7.

The dechlorinator 11 is provided with a chlorine neutralizer 16 for neutralizing chlorine separated from the dechlorinated substance B stored in the dechlorination tank 12. Is what you do.

Further, the dechlorination apparatus 11 converts the activated carbon adsorbing incineration ash and fly ash containing dioxins or fine fly ash containing dioxins and dioxins into the dechlorination tank 12 to remove dechlorinated substances. It is characterized in that it can be inserted as B.

[0016]

The present invention comprises the above-mentioned technical means and comprises a dechlorination tank 12 of a dechlorination apparatus 11 for dechlorinating a substance B to be dechlorinated.
Heating medium H for heating inner wall surface 13 serving as a heat transfer surface of
Since the exhaust gas G generated in the incinerator 2 of the incineration facility 1 and discharged from the chimney 6 is used, the dechlorination of the dechlorinated material B can be performed at low cost. The dechlorinator 11 converts dioxins collected by the secondary dust collector 7 disposed downstream of the dust collector 4 and fine fly ash containing dioxins as dechlorinated substances B. Because it is configured to dechlorinate, most of the conventional incineration facilities collect dioxins and fine fly ash containing dioxins, which have been released to the atmosphere, and treat them. Fly ash containing water and dioxins is prevented from being released into the atmosphere together with the exhaust gas G. In addition, the dechlorinated substance B is dechlorinated in the dechlorination tank 12 of the dechlorination apparatus 11. Dechlorination obtained by processing Since C is configured to be injected into the upstream side of the secondary dust collecting device 7 by the dechlorinated substance input means 51, the dechlorinated substance completely dechlorinated in the dechlorination tank 12 Only C is released into the atmosphere after passing through the secondary dust collector, and the other substances (those with incomplete dechlorination) are again dechlorinated as B to be dechlorinated. The dechlorination of fine fly ash containing dioxins and dioxins can be performed reliably and efficiently.

The dechlorination apparatus 11 is provided with a chlorine neutralization apparatus 16 for neutralizing chlorine separated from the dechlorinated substance B accommodated in the dechlorination tank 12, so that dechlorination is performed. Chlorine generated when the dechlorinated substance B is dechlorinated by the apparatus 11 is not released to the atmosphere as it is, and there is no fear of adversely affecting workers and the environment.

Further, the dechlorination apparatus 11 removes incineration ash and fly ash containing dioxins or activated carbon adsorbing dioxins and fine fly ash containing dioxins into the dechlorination tank 12 to remove dechlorinated substances. By being configured to be capable of being charged as B, not only dioxins and fine fly ash containing dioxins collected by the high-performance secondary dust collector 7, but also incineration ash containing dioxins and Chlorine is removed from dioxins contained in activated carbon that adsorbs fly ash or dioxins and fine fly ash containing dioxins, and can decompose and detoxify dioxins. Activated carbon adsorbing ash or dioxins and fine fly ash containing dioxins is not disposed of at the final disposal site. It is possible to detoxify dioxins contained in incinerated ash and fly ash containing dioxins and fine fly ash containing dioxins and dioxins which are discarded at the final disposal site. Therefore, outflow of dioxins from the final disposal site is prevented, and environmental pollution by dioxins can be prevented.

[0019]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a dechlorination apparatus 11 according to the present invention.
1 shows the first embodiment of the present invention,
Reference numeral 1 denotes dioxins and fine fly ash containing dioxins as dechlorinated substances B. The dechlorinated substances B are indirectly heated in an atmosphere having an oxygen amount of 1% or less (hereinafter referred to as anoxic state). By removing chlorine from dioxins contained in the dechlorinated substance B, and performing a dechlorination treatment for decomposing and detoxifying the dioxins,
An incineration facility including an incinerator 2, a dust collecting device 4 for collecting fly ash in exhaust gas G discharged from the incinerator 2, and a chimney 6 for discharging the exhaust gas G passing through the dust collecting device 4 to the atmosphere. 1 shows a case where the present invention is applied.

The dechlorination device 11 is provided around a cylindrical dechlorination tank 12 having an inner wall surface 13 into which the substance B to be dechlorinated is introduced as a heat transfer surface, and around the dechlorination tank 12. ,
Heating medium H for heating inner wall surface 13 of dechlorination tank 12
And a flow means 15 for flowing the dechlorinated substance B charged into the dechlorination tank 12, wherein the dechlorination tank 12 is By indirectly heating B in an oxygen-free state, the dechlorination target B can be dechlorinated.

The dechlorination tank 12 is connected to the dechlorination tank 1.
Dechlorinated substance supply unit 17 for supplying dechlorinated substance B into the inside 2
And a dechlorinated material discharge section 18 for discharging a dechlorinated material C from which chlorine has been removed from the dechlorinated material B to the outside of the dechlorination tank 12,
Screws 41 and 42 for supplying the dechlorinated substance B and discharging the dechlorinated substance C are provided in each of the dechlorinated substance supply section 17 and the dechlorinated substance discharge section 18.

The dechlorinated material supply section 17 includes
Shut-off valve 19 capable of opening and closing discharge section 23 having screw 43 of dechlorinated substance tank 21 in which dechlorinated substance B is stored
And the above-mentioned dechlorinated substance discharge section 1
8, a supply port 25 of a dechlorination tank 24 for storing the dechlorination product C is connected via an openable / closable shutoff valve 20, and the shutoff valves 19 and 20 are closed. By doing so, the inside of the dechlorination tank 12 can be sealed.

Further, as a method for making the inside of the dechlorination tank 12 oxygen-free, the amount of oxygen in the sealed dechlorination tank 12 by closing the shut-off valves 19 and 20 is determined.
Oxygen is detected by the oxygen detecting means 61 disposed in the dechlorination tank 12, and based on the detection result, the nitrogen gas supply means 62 is operated to supply nitrogen gas from the nitrogen gas cylinder 63 into the dechlorination tank 12 to thereby perform desorption. A method is considered in which the air in the chlorine tank 12 is replaced with nitrogen gas to make the inside of the dechlorination tank 12 oxygen-free.

The supply port 2 of the dechlorinated substance tank 21
2, dioxins and fine fly ash containing dioxins which could not be collected by the dust collector 4 contained in the exhaust gas G discharged from the incinerator 2 and passed through the dust collector 4. A collected matter discharge section 9 of a secondary dust collecting device 7 capable of collecting is connected via an openable / closable shutoff valve 10, and the secondary dust collecting device 7 collects from exhaust gas G. It has a collection container 8 for storing dioxins and fine fly ash containing dioxins as the collection A, and the collection A stored in the collection container 8 is the collection object A. By being discharged from the material discharge section 9, the dechlorinated material tank 2
1 and is stored in the dechlorinated substance tank 21 as the dechlorinated substance B, and at this time, the discharge of the trapped substance A from the trap discharge part 9 is as follows. This is performed by a screw 44 provided in the trap discharge section 9.

Further, a shutoff valve 1 between the collected matter discharge portion 9 of the secondary dust collecting device 7 and the supply port 22 of the dechlorinated material tank 21 is provided.
0 is closed, and the shutoff valve 19 between the discharge section 23 of the dechlorinated substance tank 21 and the dechlorinated substance supply section 17 of the dechlorination tank 12 is closed, whereby the dechlorination is performed. The inside of the chlorinated substance tank 21 can be sealed, and the amount of oxygen in the dechlorinated substance tank 21 is also adjusted in the sealed dechlorinated substance tank 21 as in the dechlorination tank 12. The nitrogen gas supply means 65 is operated based on the detection result, and nitrogen gas is supplied from the nitrogen gas cylinder 63 into the dechlorinated substance tank 21 to detect dechlorination. The air in the material tank 21 can be replaced with nitrogen gas, and the inside of the tank to be dechlorinated 21 can be made oxygen-free.

As the secondary dust collecting device 7, a bag filter or the like capable of collecting dioxins and fine fly ash containing dioxins as a collected matter A is considered. The exhaust gas passage 31 that guides the exhaust gas G that has passed through the dust collection device 4 to the chimney 6 is closed by a blind 32, and the exhaust gas passage 31 has a bypass passage 3.
3 is formed, and the secondary dust collector 7 is disposed in the bypass passage 33.

The discharge section 26 of the dechlorination tank 24
Is connected to a dechlorinated substance charging means 51 for charging the dechlorinated substance C dechlorinated in the dechlorination tank 12 into the exhaust gas passage 31. The dechlorinated substance charging means 51 includes:
The dechlorinated product C is supplied into the input medium J, and the dechlorinated product C is input into the exhaust gas passage 31 together with the input medium J. The input medium introducing pipe 52 into which the input medium J is introduced, and the input A dechlorinated material supply unit (ejector) 53 connected to the medium introduction pipe 52 and supplied with the dechlorinated material C, and the dechlorinated material C supplied to the dechlorinated material supply unit 53 is supplied to the exhaust gas passage 31 together with the input medium J. And a dechlorinated substance introduction pipe 54 to be introduced into the apparatus.

The charging medium introducing pipe 52 is connected to a downstream side of the secondary dust collecting device 7 in the bypass passage 33 in which the secondary dust collecting device 7 is provided. As a result, the exhaust gas G discharged from the secondary dust collector 7 is configured to be used. As a result, dioxins and fine fly ash containing dioxins are not mixed into the dechlorinated substance charging means 51, Moreover, the above-mentioned dechlorinated substance input pipe 54
Is a bypass passage 33 in which the secondary dust collector 7 is provided.
Is connected to a position branched from the exhaust gas passage 31, that is, upstream of the secondary dust collector 7, and contains dechlorinated products C, dioxins and dioxins, which are decomposed by dichlorination. Since the mixing with fly ash can be kept to a minimum, dioxins are completely decomposed, and the adhesion of finer dechlorinated products C to dioxins and fly ash containing dioxins is prevented, The finer dechlorinated product C can pass through the secondary dust collector 7.

Further, the introduction of the exhaust gas G, which is the injection medium J, and the introduction of the dechlorinated product C and the exhaust gas G, which is the injection medium J, into the exhaust gas passage 31 are excellent. A blower 55 is provided at the tip of the dechlorinated substance introduction pipe 54, and a nozzle 56 for satisfactorily introducing the dechlorinated substance C and the exhaust gas G as the introduction medium J is provided. Is attached.

The temperature of the inner wall 13 which is the heat transfer surface of the dechlorination tank 12 is such that chlorine is removed from dioxins in the dechlorinated substance B by indirectly heating the dechlorinated substance B in an oxygen-free state. Is maintained at a temperature at which decomposed and detoxified dechlorinated product C is obtained (350 to 550 ° C.), specifically, at 400 ° C. or higher at which dioxin decomposition and detoxification treatment is performed sufficiently and reliably. Therefore, the temperature of the heating medium H supplied to the inside of the jacket 14 is set to 600 to 80.
In this embodiment, the exhaust gas G discharged from the incinerator 2 and passed through the dust collector 4 is introduced into the jacket 14 as a heating medium H. In facility 1, the temperature inside the incinerator is usually 800
Since the temperature is maintained at not less than ° C., the temperature required for the heating medium H can be sufficiently obtained.

The exhaust gas G, which is the heating medium H introduced from the exhaust gas passage 31 located on the downstream side of the dust collector 4, passes through the heating medium introduction pipe 35 through the jacket 1.
4 and an inner wall 13 which is a heat transfer surface of the dechlorination tank 12.
Is heated and then discharged from the jacket 14 and re-entered as the exhaust gas G into the exhaust gas passage 31 located downstream (downstream from the intake position) of the dust collector 4 via the heating medium discharge pipe 36. In addition, a blower for satisfactorily introducing the exhaust gas G, which is the heating medium H, into the jacket 14 and introducing the exhaust gas G into the exhaust gas passage 31 from the jacket 14 is provided in the heating medium introduction pipe 35. 37
Are arranged.

The rotating hoist 71 shown in FIG. 2 is considered as the flow means 15 for the dechlorinated material B provided in the dechlorination tank 12. The reference numeral 71 extends along the direction of gravity into the dechlorination tank 12 and is fixed to a rotatable shaft 72 rotatably held. This shows a case where two-stage rotary winding blades 71 are provided.

The rotary winding blade 71 includes a plurality of (eight in this embodiment) base blades 73, each of which is connected to the inner wall surface 13 of the dechlorination tank 12 (heat transfer surface). Dechlorination tank 12 while having a clearance U between
Is formed so as to extend obliquely upward in the direction opposite to the rotation direction R of the rotary winding blade 71 along the inner wall surface 13 (heat transfer surface). The gap can be satisfactorily wound up by the base blade 73 without falling as described later.

Furthermore, the base blade 73 has an elongated flat surface 74 along the inner wall surface 13 (heat transfer surface) of the dechlorination tank 12 between one end 75 and the other end 76 of the base blade 73. And
The dechlorinated substances B located on the flat surface 74 formed on the base blade 73 are rotated from the one end 75 side to the other end of the base blade 73 by the rotation of the base blade 73, that is, the rotation R of the rotary winding blade 71. The inner wall surface 13 which is wound up by the action of moving to the side 76 and the action of centrifugal force and is a heat transfer surface
It is configured to be pressed against.

In addition, the dechlorination tank 12 is provided with a chlorine neutralizing device 16 for neutralizing chlorine generated by performing a dechlorination treatment on the dechlorinated substance B in the dechlorination tank 12. The chlorine neutralizer 16 is capable of treating and preventing chlorine harmful to the human body and the environment from being discharged as it is. The chlorine neutralizer 16 is a blower 66 for introducing chlorine from the dechlorination tank 12. Is connected to the dechlorination tank 12 through a chlorine introduction pipe 65 provided with

Next, the operation of the dechlorination apparatus 11 of the present invention based on the above configuration will be described. First, by operating the incineration facility 1, the exhaust gas G discharged from the incinerator 2 passes through the dust collecting device 4 provided in the exhaust gas passage 31, and then is guided to the chimney 6, where it is introduced into the atmosphere. Although discharged, the exhaust gas G passing through the dust collector 4 still contains dioxins and fine fly ash containing dioxins, and remains in the exhaust gas G. Dioxins and fine fly ash containing dioxins are collected by a secondary dust collector 7 provided in a bypass passage 33 provided between the downstream side of the dust collector 4 and the upstream side of the chimney 6. At this time, the temperature in the incinerator 2 is 800 ° C., which is the complete combustion temperature at which the generation of dioxins is suppressed.
It is kept above.

The dioxins and the fine fly ash containing dioxins collected by the secondary dust collecting device 7 are collected in the collected material storage portion 8 of the secondary dust collecting device 7 as the collected material A. At this time, the shutoff valve 10 between the collected matter discharge part 9 of the secondary dust collecting device 7 and the supply port 22 of the dechlorinated material tank 21 is closed. I have.

Further, a jacket 14 provided around the dechlorination tank 12 constituting the dechlorination apparatus 11 is provided with a heating medium introduction pipe 35 and a heating medium from an exhaust gas passage 31 located downstream of the dust collector 4. Blower 3 arranged in introduction pipe 35
The exhaust gas G of 600 to 800 ° C., which is the heating medium H, is introduced through the inside 7, and the inner wall surface 13, which is the heat transfer surface of the dechlorination tank 12, indirectly heats the dechlorination target B in an oxygen-free state. And
Temperature required for dechlorination (350-550 °
C) Specifically, it is heated to 400 ° C. or more at which the treatment for decomposing and detoxifying dioxins is performed sufficiently and reliably.

Then, the heating medium H introduced into the jacket 14 is thereafter discharged from the jacket 14 and located downstream of the dust collecting device 4 (downstream from the taken-in position) via the heating medium discharge pipe 36. Into the exhaust gas passage 31 to be exhausted.

Next, when a predetermined amount of the collected material A is stored in the collected material storage section 8, the collected material discharge section 9 of the secondary dust collecting device 7 and the supply of the dechlorinated material tank 21 are controlled. The shut-off valve 10 between the trap 22 and the port 22 is opened, and the screw 44 provided in the trap discharge section 9 is operated to collect the trap A in the trap storage section 8. At the same time when the collected matter A is discharged from the material discharging section 9, the collected matter A
Is stored in the dechlorinated substance tank 21 as the dechlorinated substance B. At this time, the space between the discharge section 23 of the dechlorinated substance tank 21 and the dechlorinated substance supply section 17 of the dechlorination tank 12 is provided. The shut-off valve 19 is in a closed state.

When a predetermined amount of the collected material A is stored in the dechlorinated material tank 21 as the dechlorinated material B, the operation of the screw 44 provided in the collected material discharging section 9 is stopped.
The storage of the dechlorinated substance B, which is the collected substance A, is completed.
By closing the shut-off valve 10 between the collected matter discharge part 9 of the secondary dust collecting device 7 and the supply port 22 of the dechlorinated substance tank 21, the inside of the dechlorinated substance tank 21 is closed. At the same time, the amount of oxygen in the dechlorinated substance tank 21 is detected by the oxygen detecting means 64 disposed in the dechlorinated substance tank 21, and based on the result, the nitrogen gas supply means 65 is operated, and Chlorine tank 2
By supplying nitrogen gas from a nitrogen gas cylinder 63 into the tank 1, the air in the tank to be dechlorinated 21 is replaced with nitrogen gas, and the inside of the tank to be dechlorinated 21 is made oxygen-free.

At this time, the inside of the dechlorination tank 12 is closed by closing the shutoff valve 20 between the dechlorinated substance discharge section 18 of the dechlorination tank 12 and the supply port 25 of the dechlorination tank 24. In addition to the closed state, the amount of oxygen in the dechlorination tank 12 is detected by the oxygen detection means 61 disposed in the dechlorination tank 12, and the nitrogen gas supply means 62 is operated based on the detection result. By supplying nitrogen gas from the nitrogen gas cylinder 63 to the inside of the tank 12, the air in the dechlorination tank 12 is replaced with nitrogen gas, and the inside of the dechlorination tank 12 is made oxygen-free.

Next, a shut-off valve 19 between the discharge part 23 of the dechlorinated substance tank 21 and the dechlorinated substance supply part 17 of the dechlorination tank 12 is used.
Is opened, and the screw 43 provided in the discharge section 23 of the dechlorinated substance tank 21 and the screw 41 provided in the dechlorinated substance supply section 17 of the dechlorination tank 12 are operated, and the dechlorinated substance tank is operated. At the same time as the dechlorinated substance B accommodated in 21 is discharged from the discharge section 23, the dechlorinated substance B is supplied from the dechlorinated substance supply section 17 of the dechlorination tank 12 into the dechlorination tank 12. .

When a predetermined amount of the dechlorinated substance B is supplied into the dechlorination tank 12, the screw 43 provided in the discharge portion 23 of the dechlorination substance tank 21 and the dechlorination tank 12 The operation of the screw 41 provided in the dechlorinated material supply unit 17 is stopped, the supply of the dechlorinated material B is completed, and the discharge unit 23 of the dechlorinated material tank 21 and the dechlorination of the dechlorination tank 12 are further stopped. By closing the shutoff valve 19 between the chlorine supply unit 17 and the dechlorination target storage tank 21 and the dechlorination tank 12, the interior of the dechlorination tank 12 is closed. At this time, since both the inside of the dechlorinated substance tank 21 and the inside of the dechlorination tank 12 are in an oxygen-free state, when the supply of the dechlorinated substance B is completed and when the supply is completed, Dechlorination tank 1
Inside 2 is made anoxic.

When the material B to be dechlorinated is supplied into the dechlorination tank 12 and when the supply is completed, the rotary winding blade 71 serving as the flow means 15 disposed in the dechlorination tank 12. Are rotated R, and the dechlorinated material B supplied into the dechlorination tank 12 is positioned on the flat surface 74 of the base blade 73 by the rotation R of the rotary winding blade 71, and the base blade 73 is rotated. As a result, the above-mentioned dechlorinated material B is wound up and the rotation R of the rotary winding blade 71 is increased.
Due to the centrifugal force accompanying this, the thin film is pressed against the inner wall surface 13 which is the heat transfer surface of the dechlorination tank 12 at a predetermined contact peripheral speed (preferably about 50 to 60 m / s).

Further, the dechlorinated substance B is supplied to the dechlorination tank 1
By the continuous winding by the rotary hoisting blades 71 arranged in 2, the dechlorinated material B wound up earlier pushes the dechlorinated material B rolled up later,
The dechlorinated material B supplied into the dechlorination tank 12 continuously rises along the inner wall surface 13 which is the heat transfer surface of the dechlorination tank 12.
Will be uniformly heated.

The dechlorinated material B pressed in a thin film shape on the inner wall surface 13 of the dechlorination tank 12 is heated by a heating medium H introduced into the jacket 14 to a heat transfer temperature of 400 ° C. or more. By the indirect heating from the inner wall surface 13 which is the surface, it is heated to 400 ° C. or more in an oxygen-free state, chlorine is removed from dioxins in the dechlorinated substance B, and decomposition and detoxification of dioxins are performed. Thus, the dechlorinated substance B becomes the dechlorinated substance C subjected to the dechlorination treatment.

Further, in the dechlorination tank 12, chlorine is generated by dechlorination of the substance B to be dechlorinated, and this chlorine is supplied to a chlorine neutralization device 16 provided in the dechlorination tank 12. Is guided through a chlorine introduction pipe 65 provided with a blower 66 and neutralized, and then discharged into the atmosphere, thereby preventing chlorine harmful to the human body and the environment from being discharged as it is. .

Next, the dechlorinated product C obtained by subjecting the dechlorinated product B supplied into the dechlorination tank 12 to dechlorination treatment is supplied to the dechlorination product discharge section 18 of the dechlorination tank 12 and the dechlorination product. By opening the shut-off valve 20 between the supply port 25 of the material tank 24 and the screw 44 provided in the dechlorinated material discharge part 18 of the dechlorination tank 12, the dechlorination tank 1 is opened.
2 and the dechlorinated material C
The dechlorinated product B is supplied into the dechlorinated product tank 24 from the supply port 25 of No. 4.

When the discharge of the dechlorinated substance C in the dechlorination tank 12 is completed, the dechlorinated substance discharge section 1 of the dechlorination tank 12
8, the operation of the screw 44 provided in the dechlorinated substance discharge section 18 and the supply port 25 of the dechlorinated substance tank 24 is stopped.
Is closed.

Next, the screw 45 of the discharge portion 25 of the dechlorination tank 24 is actuated, whereby the dechlorination tank 24 is operated.
The dechlorinated substance C stored in the inside is supplied to a dechlorinated substance supply section 53 of a dechlorinated substance charging means 51 connected to the discharge section 26 of the dechlorinated substance tank 24.

At this time, the dechlorinated material supply section 53 of the dechlorinated substance charging means 51 is provided with a charging medium introduction pipe 52 (a bypass provided with the secondary dust collecting device 7) connected to the dechlorinated substance supply section 53. The charging medium J is supplied from the secondary dust collector 7 in the passage 33 and the exhaust gas G, which is the charging medium J, introduced from the downstream side of the secondary dust collector 7). The dechlorinated product C supplied to the section 53 is sent out together with the input medium J to a dechlorinated product input tube 54, and the dechlorinated product input tube 54
The bypass passage 33 in which the secondary dust collecting device 7 is connected is branched from the exhaust gas passage 31, that is, the bypass dust is supplied to the upstream side of the secondary dust collecting device 7.

The dechlorinated product C which is charged into the bypass passage 33 in which the secondary dust collecting device 7 is disposed upstream of the secondary dust collecting device 7 and the secondary dust collecting device 7 is a dioxin or dioxin. The fine particles are finer than fine fly ash containing, and pass through the secondary dust collecting device 7 and are discharged into the atmosphere. This dechlorinated product C includes dioxins such as dioxins. It does not contain harmful substances and does not have to worry about polluting the atmosphere and the environment.

Further, by introducing the dechlorinated product C into the upstream side of the secondary dust collector 7 as described above, the dechlorinated product B is temporarily dechlorinated in the dechlorination tank 12 of the dechlorination device 11. Even if the treatment is not performed reliably and dioxins are mixed in the dechlorinated product C, the dioxins will be collected again by the secondary dust collector 7, so that the dioxins will be removed together with the exhaust gas into the atmosphere. There is no fear of being released into the inside, and the dechlorination target B is very efficiently dechlorinated.

According to the present embodiment, dioxins and fine fly ash containing dioxins can be collected in addition to the dust collector 4 generally provided in the incineration facility 1. A secondary dust collector 7 is provided, and dioxins and fine fly ash containing dioxins, which are collected by the secondary dust collector 7, are dechlorinated as dechlorinated substances B. Since the exhaust gas G discharged from the incinerator 2 is used as the heating medium H when performing the dechlorination of the dechlorinated substance B, the dechlorination of the dechlorinated substance B is performed. Chlorine treatment can be performed efficiently at low cost, and at the same time, dioxins are not released into the atmosphere together with exhaust gas, so that pollution of the atmosphere and the environment can be prevented.

Although not shown, the dechlorination unit 11
The incineration ash and fly ash containing dioxins or activated carbon adsorbing dioxins can be supplied as dechlorinated substances B to the dechlorination tank 12 of the present invention. An inlet for activated carbon adsorbing incinerated ash, fly ash, or dioxins containing the dioxin, or a dioxin connected to a dechlorinated substance supply unit 17 of a dechlorination 12 tank separate from the dechlorinated substance tank 21 described above. By installing a storage tank for incinerated ash and fly ash containing dioxins or activated carbon adsorbing dioxins, if only dioxins collected by the secondary dust collector 7 and fine fly ash containing dioxins are contained, In addition, chlorine was removed from incinerated ash and fly ash containing dioxins or dioxins contained in activated carbon that adsorbed dioxins, which had to be disposed of at final disposal sites. It is also possible to carry out the decomposition and detoxification of relaxin class.

FIG. 3 shows a dechlorination apparatus 11 of the present invention.
FIG. 4 shows another example of the fluidizing means 15 disposed in the dechlorination tank 12 in the first embodiment, and a rotating shaft 82 extending along the direction of gravity in the dechlorination tank 12 and rotatably held therein.
The spiral rotary blade 81 has a clearance V between the spiral rotary blade 81 and the inner wall surface 13 which is a heat transfer surface of the dechlorination tank 12, and has a clearance V. It is formed in a shape that extends spirally along the inner wall surface 13 (heat transfer surface) of the chlorine tank 12 obliquely upward in a direction opposite to the rotation direction R of the rotation shaft, and the clearance V is a material to be dechlorinated. The gap is such that B can be rolled up well without falling down.

Further, the spiral rotating blade 81 has a continuous flat surface 83 along the inner wall surface 13 (heat transfer surface) of the dechlorination tank 12, and the dechlorinated material located on the flat surface 83 B is configured to be wound up by an action of moving upward and an action of centrifugal force by the rotation R of the spiral rotating blade 81 and pressed against the inner wall surface 13 which is a heat transfer surface. ing.

FIGS. 4 and 5 show a second embodiment of the dechlorination apparatus 11 of the present invention, in which the dechlorination apparatus 11 of the present invention is incorporated in an existing incineration facility 1. In this example, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and only different parts will be described.

The incineration facility 1 shown in this embodiment is an example of an existing incineration facility 1, in which combustible materials D collected by a garbage truck 30 or the like are incinerated in an incinerator 2, and are incinerated. After the exhaust gas G generated in 2 is cooled by the temperature reducing device 3, fly ash contained in the exhaust gas G is collected by the dust collecting device 4, and further, the exhaust gas is processed by the exhaust gas processing device 5. After the treatment of nitrogen oxides and sulfur oxides in G, the exhaust gas G is released from the chimney 6 into the atmosphere.

In the dechlorination apparatus 11 of the present invention shown in this embodiment, the exhaust gas passage 31 between the exhaust gas treatment device 5 and the chimney 6 in the incineration facility 1 is closed by a blind 32 and the exhaust gas is exhausted. The secondary dust collecting device 7 is incorporated by forming a bypass passage 33 in which the secondary dust collecting device 7 is disposed in the gas passage 31, and the collected objects A collected by the secondary dust collecting device 7, That is, dioxins and fine fly ash containing dioxins are treated as the dechlorinated substance B, and the treatment is performed in the same manner as in the first embodiment.

Further, in the case of the incineration facility 1 shown in this embodiment, since the exhaust gas G discharged from the incinerator 2 is guided to the temperature reducing device 3, it is distributed around the dechlorination tank 12 of the dechlorination device 11. The exhaust gas G discharged from the incinerator 2 and before being guided to the temperature reducing device 3 is used as the heating medium H introduced into the jacket 14 provided, and the temperature required for the heating medium H (600 to 800 ° C).

The exhaust gas G, which is the heating medium H introduced between the incinerator 2 and the temperature reducing device 3, flows through the heating medium introduction pipe 35 through the jacket disposed around the dechlorination tank 12. After being introduced into the jacket 14, the gas is discharged from the jacket 14, and is introduced again as the exhaust gas G between the incinerator 2 and the temperature reducing device 3 (downstream from the position where it is taken in) via the heating medium discharge pipe 36. The exhaust gas G discharged from the incinerator 2 is guided to the temperature reducing device 3.

In addition, in this embodiment, the dechlorinated product C dechlorinated in the dechlorination tank 12 of the dechlorination device 11 is supplied to the upstream side of the secondary dust collection device 7 disposed in the bypass passage 33. The case where the exhaust gas G taken in from the downstream side of the exhaust gas treatment device 5 of the incineration facility 1 is used as the charging medium J for charging, and the substance B to be dechlorinated B in the dechlorination tank 12 is shown. The chlorine generated by performing the dechlorination treatment of the above is neutralized by the chlorine neutralization device 16, and the chlorine is supplied to the bypass passage 33 downstream of the secondary dust collection device 7.

In the case of the dechlorination apparatus 11 of this embodiment, as in the first embodiment, the dechlorination of the dechlorinated material B can be performed efficiently at low cost, and at the same time, the incineration facility 1 The release of dioxins and fine fly ash containing dioxins from the air can be prevented, and air pollution can be prevented.

In FIG. 4 showing this embodiment, means and devices for making the dechlorination tank and the dechlorinated substance storage tank constituting the dechlorination apparatus 11 oxygen-free are not shown.
Use of the same means as in the first embodiment, or use of other means or devices as appropriate is considered.

FIG. 5 is a flowchart showing the dechlorination process in the present embodiment. As indicated by the dashed line in the flowchart, the dioxin is supplied to the dechlorination tank 12 of the dechlorination apparatus 11. By incineration ash or fly ash containing dioxins or activated carbon adsorbing dioxins as dechlorinated substances B, containing dioxins and dioxins collected by the secondary dust collector 7 Dioxins contained in incinerated ash and fly ash containing dioxins or activated carbon adsorbing dioxins and fine fly ash containing dioxins, which had to be disposed of at final disposal sites, etc., as well as fine fly ash Can remove dioxins from wastewater and decompose and detoxify dioxins, preventing environmental pollution due to dioxin spills at final disposal sites. It can be.

In this embodiment, the case where the dechlorination apparatus 11 of the present invention is incorporated in the existing incineration facility 1 has been described. However, it is of course possible to incorporate the dechlorination apparatus 11 in advance when the incineration facility 1 is newly established. Also, it is considered that the secondary dust collecting device 7 for collecting dioxins and fine fly ash containing dioxins is directly installed in the exhaust gas passage 31 of the incineration facility 1.

Further, the heating medium H introduced into the jacket 14 of the dechlorination apparatus 11 can be used as long as the temperature (600 to 800 ° C.) required for the heating medium H can be obtained. Can be introduced from any position in the exhaust gas passage from the downstream side to the upstream side of the chimney.

[0070]

As described in detail above, the present invention has the following effects. That is, according to the first aspect, the dechlorination of the dechlorinated material can be efficiently performed at low cost, and at the same time, dioxins and fine fly ash containing dioxins are released into the atmosphere together with the exhaust gas. A dechlorination apparatus capable of preventing environmental pollution due to exhaust gas discharged from an incineration facility or the like.

According to the second aspect, chlorine generated when the dechlorinated material is dechlorinated is prevented from being released from the dechlorination apparatus as it is into the atmosphere. A safe dechlorination device is provided without any worries.

Further, according to the third aspect, it is possible to perform a dechlorination treatment of incinerated ash or fly ash containing dioxins or activated carbon adsorbing dioxins which had to be disposed of at a final disposal site or the like. Provided is a dechlorination apparatus capable of preventing environmental pollution due to outflow of dioxins at a disposal site.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a dechlorination apparatus.

FIG. 2 is a configuration diagram including a partial cross section showing a configuration of a dechlorination apparatus main body.

FIG. 3 is a perspective view showing another example of the dechlorinated substance flowing means provided in the dechlorination apparatus main body.

FIG. 4 shows a second embodiment of the dechlorination apparatus, and is a schematic view of an incineration facility incorporating the dechlorination apparatus.

FIG. 5 is a flowchart showing a flow of a dechlorination process in a second embodiment of the dechlorination apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Incineration facility 2 Incinerator 3 Temperature reducing device 4 Dust collecting device 5 Exhaust gas treatment device 6 Chimney 7 Secondary dust collecting device 8 Collected material storage unit 9 Collected material discharging unit 10 Shut-off valve 11 Dechlorination device 12 Dechlorination tank 13 inner wall surface (heat transfer surface) 14 dechlorination tank jacket 15 means for flowing dechlorinated material 16 chlorine neutralizer 17 dechlorinated material supply unit 18 dechlorinated material discharge unit 19 shutoff valve 20 shutoff valve 21 dechlorinated material Vessel 22 Supply port 23 Discharge unit 24 Dechlorination tank 25 Supply port 26 Discharge unit 31 Exhaust gas passage 33 Bypass passage 35 Heating medium introduction pipe 31 Heating medium discharge pipe 51 Dechlorinated substance charging means

Claims (3)

[Claims] 1. An incinerator 2 and a dust collecting device 4 for collecting fly ash in exhaust gas G discharged from the incinerator 2, and a chimney 6 for discharging the exhaust gas G passing through the dust collecting device 4 to the atmosphere. And a cylindrical dechlorination tank 12 having an inner wall surface 13 into which the dechlorinated material B is introduced as a heat transfer surface, and a dechlorination tank 12 disposed around the dechlorination tank 12. Inner wall surface 1 of tank 12
3, a jacket 14 into which a heating medium H for heating the heating medium 3 is introduced, and a substance B to be dechlorinated B
A dechlorination apparatus 11 for indirectly heating the dechlorinated substance B in the dechlorination tank 12 in an oxygen-free state, thereby dechlorinating the dechlorinated substance B. In this case, the heating medium H for heating the inner wall surface 13 serving as the heat transfer surface of the dechlorination tank 12 of the dechlorination apparatus 11 is provided by the incinerator 2 of the incineration facility 1.
Exhaust gas G discharged from the chimney 6 and discharged into the atmosphere from the chimney 6, having a temperature capable of maintaining the inner wall surface 13 of the dechlorination tank 12 at a predetermined temperature. 6 is introduced into the jacket 14 via a heating medium introduction pipe 35 connected to an arbitrary position of the exhaust gas passage 31 reaching the upstream side of the exhaust gas passage 6, and is taken out from the exhaust gas passage 31 after being introduced into the jacket 14. The dechlorinated material B to be supplied to the dechlorination tank 12 of the dechlorination device 11 is disposed downstream of the dust collection device 4. Dioxins and fine fly ash containing dioxins that are collected by the secondary dust collecting device 7 that can collect dioxins and fine fly ash containing dioxins in the exhaust gas G that has passed through And only The dioxins and fine fly ash containing dioxins, which are collected in the secondary dust collecting device 7, are converted into dechlorinated substances B in the dechlorination tank 12 in an oxygen-free state. A dechlorination apparatus characterized in that a dechlorinated product C obtained by indirect heating and dechlorination treatment is supplied to the upstream side of the secondary dust collecting device 7 by a dechlorinated substance charging means 51. 2. The dechlorination device 11 includes a chlorine neutralization device 16 for neutralizing chlorine separated from the dechlorinated material B stored in a dechlorination tank 12. The dechlorination apparatus according to claim 1, wherein 3. The dechlorination apparatus 11 removes incineration ash or fly ash containing dioxins or activated carbon adsorbing dioxins and fine fly ash containing dioxins into a dechlorination tank 12 to remove chlorine. The dechlorination apparatus according to claim 1, wherein the apparatus is configured to be capable of being charged as B. 4.