JP2001041437A - Waste treatment plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an waste treatment plant comprising a water treatment facility supplying cleaning water to a gas cleaner in which pollution free energy is generated by providing the water treatment facility with an ozone generator thereby removing impurities contained in reformed gas. SOLUTION: The water treatment plant comprises a thermal decomposition furnace 9, a reformer 10, a gas cleaner 11 a dry desulfurizer 12, and a gas turbine section 13. A water treatment facility 14 supplying cleaning water to the gas cleaner 11 is provided with an ozone generator 15. After harmful components are dissolved into ozone water in the gas cleaner 11 and removed, oxidative substances are removed from the gas through the desulfurizer 12 and clean fuel is supplied to the gas turbine section 13 where fuel gas for driving a gas turbine is generated and used for power generation. Harmful substances in the exhaust gas from the gas turbine section 13 is thereby reduced and environmental pollution can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment plant for removing wastes containing valuable metals and fuel gas containing flammable gas by subjecting wastes to pyrolysis, and more particularly, to a waste treatment plant which is taken out as a regenerated product. The present invention relates to an exhaust treatment plant for detoxifying fuel gas.

[0002]

2. Description of the Related Art For example, in a waste treatment plant for treating city gas, as shown in FIG. 9, a pretreatment unit 1, a thermal decomposition unit 2, a melting unit 3,
It is provided with a reforming section 4, a gas cleaning section 5, a water treatment section 6, a desulfurization section 7, and a power generation section 8. After crushing, sorting, and drying municipal waste in the pretreatment section 1, the municipal waste is supplied to the thermal decomposition section 2, After heating at high temperature, fuel gas containing fuel gas and char (pyrolysis residue)
And it was decomposed and generated.

[0003] In the waste treatment plant, of the fuel gas and char decomposed and generated up to the thermal decomposition section, the char is again melted in the melting section 3 to form slag, while the fuel gas is cracked in the reforming section 4. To perform gas reforming, and further supply water from the water treatment unit 6 to the reformed gas in the gas cleaning unit 5,
Under rapid cooling, re-synthesis of dioxin is prevented, and after removing harmful substances in the desulfurization unit 7, the power is supplied to the power generation unit 8 as clean fuel to generate power.

[0004] As described above, the conventional waste treatment plant is designed to control harmful waste, recover valuable resources, and effectively use energy to prevent environmental pollution.

[0005]

The conventional waste treatment plant shown in FIG. 9 has several problems, one of which is the reforming generated in the pyrolysis unit 2 and the reforming unit 4. It is extremely toxic to cyanide contained in gas.

[0006] The reformed gas generated in the pyrolysis section 2 and the reforming section 4 is mainly composed of nitrogen, hydrogen, carbon monoxide, hydrocarbons and the like. And harmful components such as hydrogen cyanide. In this case, it is generated by cracking in the reforming section 4,
When the reformed gas containing no dioxin is washed with water supplied from the water treatment unit 6 in the gas washing unit 5, hydrogen chloride and ammonia become acids and alkalis such as hydrochloric acid and ammonia water, but highly toxic cyan is cyan. It becomes salt and hydrogen cyanide gas. If these harmful substances are blown out of the system, they may be adversely affected by the operator.

The present invention has been made in view of such circumstances, and when cleaning a reformed gas, in addition to removing impurities contained in the reformed gas, cyanide is reliably decomposed or other substances are removed. It is an object of the present invention to provide a waste treatment plant that generates pollution-free energy by reacting with wastewater.

[0008]

According to a first aspect of the present invention, there is provided a waste treatment plant according to the present invention. A vessel, a gas cleaning device, a desulfurization device, and a gas turbine unit are sequentially provided, and in a waste treatment plant provided with a water treatment device that supplies cleaning water to the gas cleaning device, an ozone generator is provided in the water treatment device. Things.

According to a second aspect of the present invention, in a waste treatment plant according to the present invention, a water treatment apparatus converts an ozone gas supplied from an ozone generator into ozone water to perform gas cleaning. It is supplied to the device.

According to a third aspect of the present invention, in the waste treatment plant according to the present invention, the water treatment apparatus includes an ozone water circulation system for circulating ozone water supplied to the gas cleaning apparatus. It is provided with.

According to a fourth aspect of the present invention, there is provided a waste treatment plant comprising an ozone water circulation system, an ozone reactor, a storage tank, a pressurizing pump, and a drainage storage tank. It consists of.

According to a fifth aspect of the present invention, there is provided a waste treatment plant according to the present invention, wherein a pyrolysis furnace, a reformer, a gas cleaning device, While installing a desulfurization device and a gas turbine part sequentially,
In a waste treatment plant provided with a water treatment device for supplying cleaning water to the gas cleaning device, the desulfurization device is filled with a desulfurizing agent and an ozone generator for supplying ozone gas to the desulfurizing agent is provided.

[0013] In the waste treatment plant according to the present invention, in order to achieve the above object, the desulfurizing agent is iron oxide.

In order to achieve the above object, the waste treatment plant according to the present invention is provided with a circulation path for circulating unreacted ozone gas in the desulfurizing agent.

In order to achieve the above object, a waste treatment plant according to the present invention, as described in claim 8, comprises a pyrolysis furnace, a reformer, a gas cleaning device, While installing a desulfurization device and a gas turbine part sequentially,
In a waste treatment plant provided with a water treatment device that supplies cleaning water to the gas cleaning device, an ozone generator is provided in the water treatment device, and power from the gas turbine unit is supplied as a drive source of the ozone generator. Power line connected to the ozone generator.

According to a ninth aspect of the present invention, there is provided a waste treatment plant according to the present invention, wherein a pyrolysis furnace, a reformer, a gas cleaning device, While installing a desulfurization device and a gas turbine part sequentially,
In a waste treatment plant provided with a water treatment device that supplies cleaning water to the gas cleaning device, an electrolytic ozone generator is provided in the water treatment device, and ozone water generated from the electrolytic ozone generator is harmful. An ozone reactor for reacting and decomposing components is provided.

[0017] In order to achieve the above object, a waste treatment plant according to the present invention has the following features.
Waste treatment with a pyrolysis furnace, a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit sequentially provided along the waste treatment flow, and a water treatment device that supplies cleaning water to the gas cleaning device The plant is provided with an ozone gas generator for supplying ozone gas to the desulfurizing agent filled in the desulfurizing device, and a means for supplementarily supplying oxygen to the desulfurizing agent.

[0018] In order to achieve the above object, a waste treatment plant according to the present invention has the following features.
Waste treatment with a pyrolysis furnace, a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit sequentially provided along the waste treatment flow, and a water treatment device that supplies cleaning water to the gas cleaning device In the plant, while providing an ozone generator for supplying ozone gas to the water treatment device,
The water treatment apparatus is provided with an ozone exhaust gas circulation path for reusing untreated exhaust ozone gas.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a waste treatment plant according to the present invention will be described with reference to the drawings and reference numerals attached to the drawings.

FIG. 1 is a schematic block diagram showing a first embodiment of a waste treatment plant according to the present invention.

According to the present embodiment, the waste treatment plant includes:
For example, the apparatus is provided with a pyrolysis furnace 9, a reformer 10, a gas cleaning device 11, a dry desulfurization device 12, and a gas turbine unit 13 in order along the flow of a procedure for treating waste such as municipal waste.

Further, the waste treatment plant according to the present embodiment comprises a water treatment device 14 for supplying water to the gas cleaning device 11.
Is provided with an ozone generator 15.

In a waste treatment plant having such a configuration, municipal waste is crushed by a pretreatment unit (not shown).
The sorted and dried waste is supplied to a pyrolysis furnace 9 where it is indirectly heated at a temperature of 500 ° C. or more, and during this time, a gas containing a fuel gas and a char (pyrolysis residue) are generated.

Gas generated from the pyrolysis furnace 9 and char;
Specifically, carbon, rubble, metal and the like are converted into slag in a melting furnace (not shown), and gas is supplied to the reformer 10.

The gas supplied to the reformer 10 is, for example, 1
Under heating at a high temperature of 000 ° C. or more, it is converted into a fuel gas containing hydrogen and carbon monoxide as main components. At that time, the gas is kept in a high-temperature heating state in the reformer 10 for a predetermined time, so that the synthesis of dioxin is suppressed.

The gas leaving the reformer 10 is supplied to the gas cleaning device 1
1 where it is rapidly cooled by the wash water supplied from the water treatment device 14 to remove dust, salt and the like. At this time, if the gas contains a trace amount of harmful components such as cyan, the ozone generator 15 supplies the ozone gas to the water treatment device 14 and diffuses the supplied ozone gas into water to remove the ozone water. Then, harmful components such as cyan are decomposed and reacted with the ozone water as shown in the following formula.

[0027]

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The gas from which harmful components such as cyan are decomposed and reacted with ozone water by the gas cleaning device 11 to remove harmful substances is removed by the dry desulfurization device 12 to remove acidic substances, and then the gas turbine unit 13 is used as clean fuel. To generate a fuel gas to drive a gas turbine (not shown) for power generation.

As described above, in the present embodiment, the water treatment apparatus 1
4, an ozone generator 15 is provided, and the ozone water from the ozone generator 15 is supplied to the gas cleaning device 11 via the water treatment device 14 to decompose and react harmful components such as cyan contained in the gas. Gas turbine unit 1 as clean energy
3, the harmful substances of the exhaust gas emitted from the gas turbine unit 13 can be suppressed to a low level, which can contribute to the prevention of environmental pollution.

Further, in this embodiment, the generation of the harmful substances is suppressed by decomposing and reacting the harmful components such as cyan with ozone water, so that even if the gas is blown out of the system for some reason, the operation operation is not performed. There is no specific adverse effect on members.

FIG. 2 is a schematic block diagram showing a second embodiment of the waste treatment plant according to the present invention. Note that the same reference numerals are given to portions corresponding to the components of the first embodiment.

The waste treatment plant according to the present embodiment
The water treatment device 14 provided in the gas cleaning device 11 is constituted by an ozone water circulation system 16 and an ozone generator 15 is connected to the ozone water circulation system 16.

The ozone water circulation system section 16 diffuses the ozone gas supplied from the ozone generator 15 into water to form ozone water, and pressurizes the ozone water with a pressure pump 17 and an ozone reaction of the pressurized ozone water. An ozone reactor 18 that enhances
A storage tank 19 for storing pressurized ozone water subjected to a high ozone reaction in the ozone reactor 18, and a pump 2 from the storage tank 19.
And a wastewater storage tank 21 for temporarily storing wastewater that is supplied to the gas cleaning device 11 through the gas cleaning device 11 and decomposes and reacts harmful components such as cyan.

As described above, in the present embodiment, the water treatment apparatus 14 is formed in the ozone water circulation system section 16 and the ozone reactor 18 that diffuses ozone gas into water to generate high ozone water is connected to the ozone water circulation system section. 16
The harmful components such as cyan contained in the gas supplied from the reformer 10 can be reliably decomposed and reacted, and even if the gas is blown out of the system for some reason, there is a physical adverse effect on the operator. Never give.

FIG. 3 is a schematic block diagram showing a third embodiment of the waste treatment plant according to the present invention. Note that the same reference numerals are given to portions corresponding to the components of the first embodiment.

The waste treatment plant according to the present embodiment
A dry desulfurization device 12 provided on the downstream side of the gas cleaning device 11 is filled with a desulfurization agent 22, and ozone gas is supplied to the desulfurization agent 22 to efficiently regenerate iron sulfide. Note that the other configuration is the same as that of the first embodiment,
The description and figures are omitted.

Conventionally, when hydrogen sulfide is contained in the gas cleaned by the gas cleaning device 11, the gas cleaning device 11 is provided with a dry desulfurization device 12 on the downstream side to remove hydrogen sulfide.

However, if the hydrogen sulfide removed by the dry desulfurization unit 12 is left as it is, it leads to wasteful consumption of energy. Therefore, some reuse is required.

In the present embodiment, in consideration of such points, the dry desulfurization apparatus 12 is filled with a desulfurizing agent 22, specifically, iron oxide FeO, and reacts the iron oxide FeO with hydrogen sulfide H ₂ S. This produces iron sulfide FeS, and the ozone gas is supplied to the iron sulfide FeS to regenerate it as an oxidizing agent.

The reaction between iron oxide FeO and hydrogen sulfide H ₂ S and the reaction between iron sulfide FeS and ozone gas can be expressed by the following equations, respectively.

[0041]

Embedded image

As described above, in this embodiment, the desulfurizer 22 is charged into the dry desulfurizer 12, and the iron sulfide FeS generated by the reaction between the iron oxide FeO and the hydrogen sulfide H ₂ S as the desulfurizer 22 contains the ozone gas O 2. ₃ was supplied to regenerate iron oxide FeO again as an oxidizing agent, so that resources can be effectively used.

FIG. 4 is a schematic block diagram showing a modification of the third embodiment of the waste treatment plant according to the present invention. Note that the same reference numerals are given to portions corresponding to the components of the third embodiment.

The waste treatment plant according to the present embodiment
The desulfurization agent 22 filled in the dry desulfurization device 12, specifically, a circulation path 23 for circulating the ozone gas supplied from the ozone generator 15 into the iron oxide FeO is provided in the desulfurization agent 22.

When the desulfurizing agent 22 is oxidized and regenerated with ozone gas, a part of the ozone gas supplied to the iron sulfide FeS may remain unreacted.

In the present embodiment, in consideration of such a point, a circulation path 23 is provided in the desulfurizing agent 22.

According to the present embodiment, the circulation path 23 for circulating the ozone gas through the desulfurizing agent 22 is provided.
, And the effective use of resources can be achieved. According to the trial calculation, the utilization rate of the ozone gas is improved by 10% or more, so that the ozone gas can be effectively used with less waste.

FIG. 5 is a schematic block diagram showing a fourth embodiment of the waste treatment plant according to the present invention. Note that the same reference numerals are given to portions corresponding to the components of the first embodiment.

The waste treatment plant according to the present embodiment
Ozone generator 1 for supplying ozone gas to water treatment device 14
The motive power as the driving source of No. 5 is obtained from the electric power generated in the gas turbine unit 13 via the electric power line 24.

As described above, in the present embodiment, the motive power as the driving source of the ozone generator 15 for generating the ozone gas is obtained from the electric power generated from the gas turbine unit 13 via the electric power line 24. Together, the waste recycling efficiency can be further improved.

FIG. 6 is a schematic block diagram showing a modification of the fifth embodiment of the waste treatment plant according to the present invention. Note that the same reference numerals are given to portions corresponding to the components of the first embodiment.

The waste treatment plant according to the present embodiment
In order to decompose and react harmful components such as cyan generated in the reformer to make them harmless as cyan oxide, an ozone generator 15 that supplies ozone water to an ozone reactor 25 provided in the water treatment apparatus 14 is provided. It is an electrolytic type. The other configuration is the same as that of the first embodiment, and the description and drawings are omitted.

As described above, in the present embodiment, the ozone generator 15 is of an electrolytic type for generating ozone by electrolyzing water, and ozone water as an aqueous solution is supplied to the ozone reactor 25 for water treatment. Since harmful components such as sodium cyanide NaCN and potassium cyanide KCN supplied from the device 14 are sodium carbon 2NaHCO ₃ and potassium potassium KHCO ₃ , it is possible to make the cyano harmless.

FIG. 7 is a schematic block diagram showing a sixth embodiment of the waste treatment plant according to the present invention.

The waste treatment plant according to the present embodiment
An improvement is added to the third embodiment shown in FIG. 3, in which a dry desulfurizer 12 is filled with iron oxide FeO as a desulfurizing agent 22, and iron oxide is reacted with hydrogen sulfide H ₂ S to form iron sulfide FeS.
Ozone gas is supplied to the iron sulfide FeS to regenerate the iron oxide FeO, and at the time of inspection and replacement, oxygen is supplementarily added to the iron sulfide to maintain the iron oxide FeO as an oxidizing agent for a long time.

As described above, in this embodiment, the iron oxide Fe
Since oxygen is added to O and maintained as an oxidizing agent for a long time, for example, at the time of inspection and replacement, the regeneration operation of iron sulfide FeS can be performed more easily than usual.

FIG. 8 is a schematic block diagram showing a waste treatment plant according to a seventh embodiment of the present invention.

The waste treatment plant according to the present embodiment
In consideration of the fact that the ozone gas supplied from the ozone generator 15 to the water treatment device 14 does not completely react with harmful components such as cyanide and becomes partially unreacted, it is necessary to reuse the unreacted ozone gas. , Water treatment device 14 and ozone generator 1
5, an ozone exhaust gas circulation path 26 is provided.

Therefore, according to the present embodiment, the ozone exhaust gas circulation path 26 for reusing unreacted ozone gas is provided, so that the utilization rate of ozone gas can be further improved and the resources can be effectively used. Can be.

[0060]

As described above, in the waste treatment plant according to the present invention, when a harmful component such as cyan produced in the reformer is cleaned by the gas cleaning device, the wastewater treatment plant switches from the water treatment device to the gas cleaning device. Ozone supply means for adding ozone gas to the supplied cleaning water has been provided to detoxify harmful components such as cyanide. No adverse effects on members.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a first embodiment of a waste treatment plant according to the present invention.

FIG. 2 is a schematic block diagram showing a second embodiment of the waste treatment plant according to the present invention.

FIG. 3 is a schematic block diagram showing a third embodiment of the waste treatment plant according to the present invention.

FIG. 4 is a schematic block diagram showing a modified example of the third embodiment of the waste treatment plant according to the present invention.

FIG. 5 is a schematic block diagram showing a fourth embodiment of the waste treatment plant according to the present invention.

FIG. 6 is a schematic block diagram showing a fifth embodiment of the waste treatment plant according to the present invention.

FIG. 7 is a schematic block diagram showing a sixth embodiment of the waste treatment plant according to the present invention.

FIG. 8 is a schematic block diagram showing a waste treatment plant according to a seventh embodiment of the present invention.

FIG. 9 is a schematic system diagram showing a conventional waste treatment plant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pre-processing part 2 Thermal decomposition part 3 Melting part 4 Reforming part 5 Gas cleaning part 6 Water treatment part 7 Desulfurization part 8 Power generation part 9 Thermal decomposition furnace 10 Reformer 11 Gas cleaning device 12 Dry desulfurization device 13 Gas turbine part 14 Water treatment device 15 Ozone generator 16 Ozone water circulation system 17 Pressure pump 18 Ozone reactor 19 Storage tank 20 Pump 21 Wastewater storage tank 22 Desulfurizer 23 Circulation path 24 Power line 25 Ozone reactor 26 Ozone exhaust gas circulation path

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Imai 2-4, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 3K070 DA01 DA03 DA06 DA13 DA15 DA23 DA38 DA81 4D050 AA08 AB38 BB02 BD03 BD04 CA20

Claims (11)

[Claims] 1. A water treatment apparatus for sequentially providing a pyrolysis furnace, a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit along a waste treatment flow, and for supplying cleaning water to the gas cleaning device. A waste treatment plant, wherein an ozone generator is provided in the water treatment device. 2. The waste treatment plant according to claim 1, wherein the water treatment device converts the ozone gas supplied from the ozone generator into ozone water and supplies the ozone water to the gas cleaning device. 3. The waste treatment plant according to claim 1, wherein the water treatment device includes an ozone water circulation system for circulating ozone water supplied to the gas cleaning device. 4. An ozone water circulation system section comprising: an ozone reactor;
The waste treatment plant according to claim 2, comprising a storage tank, a pressure pump, and a drainage storage tank. 5. A water treatment device for sequentially providing a pyrolysis furnace, a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit in accordance with a waste treatment flow, and for supplying cleaning water to the gas cleaning device. A waste treatment plant provided with an ozone generator for filling the desulfurization device with a desulfurization agent and supplying ozone gas to the desulfurization agent. 6. The waste treatment plant according to claim 4, wherein the desulfurizing agent is iron oxide. 7. The waste treatment plant according to claim 4, wherein a circulation path for circulating unreacted ozone gas is provided in the desulfurizing agent. 8. A water treatment apparatus for sequentially providing a pyrolysis furnace, a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit along a waste treatment flow, and for supplying cleaning water to the gas cleaning device. In the provided waste treatment plant, an ozone generator is provided in the water treatment device, and a power line for supplying power from the gas turbine unit as a drive source of the ozone generator is connected to the ozone generator. Waste plant. 9. A water treatment device for sequentially providing a pyrolysis furnace, a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit along a waste treatment flow, and for supplying cleaning water to the gas cleaning device. In the waste treatment plant provided, while providing an electrolytic ozone generator in the water treatment device,
A waste treatment plant comprising an ozone reactor for reacting and decomposing ozone water generated from an electrolytic ozone generator with harmful components. 10. A pyrolysis furnace along a waste treatment flow,
In a waste treatment plant equipped with a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit in order, and a water treatment device for supplying cleaning water to the gas cleaning device, a desulfurizing agent filled in the desulfurization device is used. A waste treatment plant comprising: an ozone gas generator for supplying ozone gas; and means for supplementarily supplying oxygen to the desulfurizing agent. 11. A pyrolysis furnace along a waste treatment flow,
In a waste treatment plant provided with a reformer, a gas cleaning device, a desulfurization device, and a gas turbine unit sequentially, and a water treatment device for supplying cleaning water to the gas cleaning device, ozone gas is supplied to the water treatment device. A waste treatment plant comprising an ozone generator and an ozone exhaust gas recirculation path for reusing untreated waste ozone gas in the water treatment apparatus.