JP2002282896A - Thermal decomposition treatment plant and method based on gas engine power generation using digestion gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a running cost through the use of digestion gas as fuel for gas engine power generator and maintain electricity supply within the facil ity by generating power using a gas engine power generator. SOLUTION: In a sewage treatment plant 61, semi-liquid organic materials such as sewage, sludge and garbage, etc., are treated and charged into a digestion tank 71 for fermentation to obtain digestion gas containing methane as a main component. The digestion gas is desulfurized by a desulfurizer 72 and sent to a gas engine power generator 82 at a power generation plant 81 for power generation. The exhaust gas generated by the power generator 82 is supplied to a thermal decomposition furnace 92 at a thermal decomposition plant 91 through an exhaust pipeline 88 as a thermal source. The digested sludge (materials to be treated) in the digestion tank 71 is charged into the thermal decomposition furnace 92 through a dryer for being treated. The residue after being treated at the thermal decomposition furnace 92 is recovered by a recovery means 95.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a heating method / facility in a pyrolysis treatment technology for indirectly heating and reducing the volume (drying, carbonization, incineration) of an object to be treated such as sludge or the like, A gas engine generator (gas turbine, gas engine) is installed, and the power obtained by generating power is used as a power source for equipment installed in the facility, and the main fuel of the gas engine is obtained by digesting sludge. It uses digestion gas (gas mainly composed of methane gas and carbon dioxide gas), and uses exhaust gas generated from a gas engine generator as a heating means (process) for thermal decomposition of an object to be treated, thereby reducing total energy. The present invention relates to a pyrolysis treatment facility and a pyrolysis treatment method using a gas engine power generation facility using a digestion gas so as to reduce running costs.

[0002]

2. Description of the Related Art Various types of waste are increasing year by year, and various techniques have been proposed for their disposal. One of them is to heat and thermally decompose the waste, burn the decomposed gas generated by the pyrolysis and the pyrolysis residue, process the generated ash into molten slag, treat the ash, and generate the thermal energy (exhaust It is known to convert heat energy into electric power and recover it by using gas → steam) for a power generator.

Further, it is known that electric power is obtained by a gas turbine generator and exhaust gas generated is used as a heat source for thermal decomposition of waste (Japanese Patent Laid-Open No. 8-49821).
JP-A-8-49822, JP-A-11-18221
No. 1).

Further, Japanese Patent Application Laid-Open No. Hei 5-2 discloses an apparatus for supplying additional fuel to the exhaust gas of a gas turbine to promote combustion.
No. 64040 is known.

Further, Japanese Patent Application Laid-Open No. 2000-337171 discloses a method for generating electricity by supplying a carbonized gas obtained by carbonizing wastes as fuel for a gas turbine.

In addition, Japanese Unexamined Patent Publication No. 5-28832 discloses an apparatus for generating electricity by operating a gas engine using digestive gas as fuel.
7, JP-A-2000-331701, JP-A-9-8
No. 8630 and JP-A-7-204697 are known.

[0007]

As described above, using the exhaust gas of the gas turbine as a heating source for the object to be processed contributes to a reduction in running cost. However, the temperature of the exhaust gas of the gas turbine is generally 400 to 550 ° C.
And the thermal decomposition temperature of the object may not always be sufficient.

That is, in the actual heat treatment, the temperature required for thermal decomposition depends on the properties of the object to be treated.
The required temperature is about 700 ° C., and the temperature is reduced by about 50 ° C. to 100 ° C. due to heat radiation from the device. As a result, the temperature required for thermal decomposition may not be secured.

Further, since the thermal decomposition temperature varies depending on the properties of the object to be treated, it is difficult to perform stable thermal decomposition.

[0010] Further, there is also a problem that it takes a long time to reach a predetermined temperature at which the introduction of the object to be treated is started only by the temperature of the exhaust gas of the gas turbine. Although it is possible to raise the temperature of exhaust gas by devising the gas turbine itself, it is difficult to use this temperature stably for a long period of time in terms of heat durability, etc. Becomes
The operation is frequently stopped due to maintenance and inspection, which leads to an increase in running costs, which is not a good measure.

Furthermore, if the object to be treated is burned as it is, the object to be treated contains various substances and moisture, so that it is difficult to stably burn it, incomplete combustion is likely to occur, and the safety is lacking. There's a problem.

Particularly, in the case of Japanese Patent Application Laid-Open No. 2000-337171, it is intended to reduce the fuel cost by generating electricity using the carbonized gas as fuel, but the combustible components of the carbonized gas obtained by the properties of the waste It is difficult to perform stable power generation because of the wide variety.

The present invention has been made in view of the above circumstances, and uses a digestive gas such as methane gas produced by organic matter fermentation as a fuel for a gas engine, and uses a gas turbine such as a gas turbine equipped with a power generator or a gas engine. To reduce the running cost by using the exhaust gas of the engine as the heat source of the thermal decomposition means to treat the sludge and other objects to be treated, and to secure the power in the facility by generating electricity with the gas engine generator If the temperature of the exhaust gas from the gas engine generator is lower than the required temperature, supply the adjustment gas to the digestion gas, or supply the fuel to the exhaust gas with the afterburner to burn it, By installing a burner, it is possible to obtain hot blast gas at a temperature higher than the exhaust gas temperature (400 to 550 ° C) of the gas engine generator, and it is possible to heat under the temperature conditions that match the properties of various objects to be treated. To become, and to provide a stable thermal decomposition treatment facilities and thermal cracking process with a gas engine power generation facility using biogas can perform thermal decomposition.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an exhaust gas (temperature: 400 to 550) of a gas engine such as a gas turbine or a gas engine equipped with a generator.
C) to heat the object to be processed and to perform thermal decomposition. In such a configuration, power is generated by the gas engine to secure power in the facility, and a digestive gas such as methane gas produced by organic matter fermentation is used as a fuel. Digestion gas is methane gas (about 60%), carbon dioxide gas (about 40%)
And a calorific value of about 5000 to 8000
In kcal / m ^3, heat of natural gas comprising methane alone (about 4
Although it is lower than 2,000 kcal / m ³ ), its properties are relatively stable. Therefore, a gas engine is operated using digestive gas as fuel to obtain electric power.

An object to be treated such as digested sludge is heated and thermally decomposed by using exhaust gas generated by the operation of the gas engine.
That is, for example, in a sewage treatment plant facility, there is a system that ferments sludge to obtain a digestive gas to produce fuel, and the remaining digested sludge is thermally decomposed to remove organic substances, and the remaining residue can be effectively used. Can be built.

In order to perform stable pyrolysis (thermal decomposition at a high temperature) suitable for the material to be treated or to perform stable operation even when there is a change in digestion gas, Introduce additional fuel or install additional combustion means.

That is, when the properties of the gas used in the gas engine are not stable, or when the exhaust gas of the gas engine alone does not provide sufficient heating temperature conditions suitable for the object to be treated, the fuel (LNG, LPG, LPG, (Oil, heavy oil) to make a mixed fuel, add gas fuel to the exhaust gas of the gas engine and burn it (afterburner), or use a post-burn burner in a hot blast stove to achieve the desired temperature. Try to get hot blast gas.

Further, attention has been paid to the fact that the processed material (carbide) obtained by thermally decomposing the processed material is burned and ashed, thereby stably burning the processed material.

That is, in the case where the effective use of carbides cannot be found, attention has been paid to the fact that the safer and more stable combustion can be achieved through the process of treating the material, carbonization and incineration. In short, gas is reliably generated by a gas engine generator using digestion gas as fuel, the obtained electric power is used for facility operation, and waste gas such as sludge is used by using exhaust gas obtained by operating the gas engine. An object to be processed was heated. The means for solving the problem will be described below.

First, charging means for charging an object to be processed, thermal decomposition means for moving the charged object while heating and thermally decomposing the same, and burning decomposed gas generated during the heat treatment from the object to be processed. A digestion tank for fermenting an organic substance to obtain a digestion gas, and a gas engine power generation facility for obtaining a high-temperature exhaust gas serving as a heating source for the pyrolysis means. And means for supplying digestive gas obtained in the digestion tank as fuel to the gas engine power generation facility.

A charging step of charging the processing object, a pyrolysis step of moving the charging processing object while heating and thermally decomposing, and a decomposition step of burning a decomposition gas generated from the processing object during the heating process. A pyrolysis treatment method comprising a gas combustion step, wherein digestion gas obtained by fermenting organic substances in a digestion tank is supplied as fuel to a gas engine power generation facility to obtain electric power and high-temperature exhaust gas. The object to be treated is thermally decomposed in the pyrolysis step by using the obtained high-temperature exhaust gas as a heating source, the decomposition gas generated by the thermal decomposition is burned in a carbonization gas combustion furnace, and the exhaust gas is purified and discharged. It is characterized by having made it.

The material to be treated includes digested sludge in the digestion tank, but other wastes may be mixed.

The fuel is injected into the exhaust gas from the gas engine power generation facility and burned to obtain a high-temperature hot wind gas. Further, exhaust gas from the gas engine power generation facility is introduced into a hot blast stove provided with a combustion burner to obtain a synthetic hot blast gas.

The gas engine power generation facility comprises a gas turbine power generation device, and heats the air compressed by the compressor of the power generation device and introduces the air into the combustor. Further, the gas engine power generation facility includes a gas engine power generation device.

The thermal decomposition means has a decomposition vessel provided with a means for introducing and stirring and transporting an object to be treated, and is indirectly heated from outside the decomposition vessel by hot air gas.

A plurality of decomposition vessels for introducing an object to be processed and performing indirect heating are arranged side by side. A plurality of disassembly containers are individually enclosed by a heating jacket or are encased in a lump.

When the treated material after the thermal decomposition is burned and incinerated, the generated exhaust gas is preferably introduced into a decomposition gas combustion step and burned.

It is preferable that a heat treatment is performed by adding a treating agent (chemical) which reacts with an organic halogen substance generated by thermal decomposition to form harmless chloride to the object to be treated. By using this, the detoxification treatment of the heat treatment facility can be realized.

As the treating agent (agent), at least one kind among alkali metals, alkali metal compounds, alkaline earth metals, and alkaline earth metal compounds is selected or two or more kinds are mixed.

The alkali metal compounds are lithium, sodium, potassium, rubidium and potassium oxides, hydroxides, bicarbonates, carbonates, silicates, phosphates, aluminates, nitrates and sulfates.

Specific treatment agents for alkali metal compounds include sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, natural soda, potassium carbonate, potassium hydrogen carbonate, sodium potassium carbonate, sodium hydroxide,
Using potassium hydroxide, as sodium bicarbonate, acid sodium carbonate, sodium bicarbonate, sodium bicarbonate, sodium carbonate, sodium carbonate, soda, soda ash, laundry soda, crystal soda, sodium sesquicarbonate, Sodium bicarbonate-sodium bicarbonate, sodium bicarbonate, sodium sesquicarbonate,
Trona is used as a natural soda.

The treating agent for the alkaline earth metal compound is lime (CaO) slaked lime (Ca (OH) ₂ ), calcium carbonate (CaC
O ₃ ) Dolomite (CaCO ₃ .MgCO ₃ ) is used.

Alkali metal treating agents include Li, Na,
K, Rb, Cs, and Fr are used.

The treating agent for the alkaline earth metal is Ca, S
r, Ba, Ra are used.

[0035]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a pyrolysis treatment facility using a gas engine power generation facility using digestive gas according to an embodiment of the present invention. In FIG.
1 is a digestion tank, 81 is a gas engine power generation facility, and 91 is a pyrolysis treatment facility (details will be described later).

The sewage treatment facility 61 includes an inflow water 62, a sedimentation basin 63, an aeration tank 64, a final sedimentation basin 65, and a sludge concentration tank 6.
6 is comprised. In the sewage treatment facility 61, the inflow water 62 containing semi-fluid organic matter such as sewage sludge and garbage is introduced into the sedimentation basin 63 to partially precipitate the semi-fluid organic matter as sludge and to remove supernatant water. It is introduced into the aeration tank 64. Thereafter, the water introduced into the aeration tank 64 is
, And introduced into the final sedimentation basin 65. In this final sedimentation basin 64, the supernatant water is discharged, and the settled sludge is returned to the aeration tank 64 as return sludge. The excess sludge is mixed with the sludge obtained in the sedimentation basin 63 and the sludge concentration tank 6.
6 and the sludge is concentrated.

As described above, in the sewage treatment facility 61,
Process semi-fluid organic matter such as sewage sludge and garbage,
The obtained concentrated sludge is introduced into the digestion tank 71 and fermented to obtain a digestion gas containing methane as a main component. The obtained digested gas is supplied to a desulfurization device 72 to remove sulfur content, stored in a high-pressure tank 75 via a gas holder 73 and a compressor 74, and passed through the high-pressure tank 75 to remove gas from a gas engine power generation facility 81. Engine generator 82
(Gas engine generator or gas turbine generator) is supplied with fuel via a fuel adjustment mixer described later.
Electric power is obtained by driving the gas engine generator to generate electric power.

The gas engine generator 82 in the gas engine power generation facility 81 includes a gas turbine 83, a combustor 84, an air compressor 85, a generator 86, and a fuel adjusting mixer 87. Is used as a heating source of a pyrolysis furnace 92 in a pyrolysis treatment facility 91 via an exhaust gas pipe 88.

When the temperature of the exhaust gas from the gas engine generator 82 is lower than the required temperature, an additional fuel such as LNG, LPG, kerosene, or heavy oil is supplied from the fuel adjustment mixer 87 to the digestion gas. Hot air gas at a desired temperature is obtained by supplying fuel to the exhaust gas and burning it (afterburner) or by installing a post-cooking burner 93.

Thermal decomposition furnace 92 in thermal decomposition processing facility 91
, An object to be treated such as digested sludge in the digestion tank 71 is supplied through the drying means 94. The hot air gas that has passed through the thermal decomposition furnace 92 is used as a hot air gas for drying the object to be processed by a drying unit 94.
To dry the object. In addition, the thermal decomposition furnace 92
Is collected by the collecting means 95. In this case, if it can be used effectively, it is separated and used, and if it is difficult to use it, it is processed at the final disposal site.

Next, a schematic explanatory diagram of the gas engine power generation facility 81 and the thermal decomposition processing facility 91 will be described. FIG. 2 shows a thermal decomposition processing facility 91 provided with a gas engine generator 82 in the gas engine power generation facility 81. This is an embodiment in which decomposition vessels provided with screw-type stirring and conveying means are stacked in two stages.

In FIG. 2, reference numeral 10 denotes an input means for inputting an object to be processed such as the above-mentioned digested sludge, which comprises a hopper 11 and a screw conveyor 12 driven by a motor M.

Reference numeral 20 denotes a pyrolysis means (a pyrolysis furnace 92 and a drying means 94 in FIG. 1) for heating and thermally decomposing an object to be treated such as digested sludge. An object to be processed is charged from a supply port 21a at one end of the upper decomposition vessel 21 and transferred to a discharge port 21c while being stirred by a transporting means 21b. Decomposition container 22
Is transported from the supply port 22a to the discharge port 22c while being stirred by the transfer means 22b of the decomposition container 22, and discharged from the discharge port 22c. Conveying means 21b and 22b consists of a screw or spiral conveyors, it is driven to rotate at a respective motor M ₁ and M _2.

The decomposition vessels 21 and 22 are each heated by external heating means. This external heating means comprises a heating jacket HJ that covers the entire decomposition vessels 21 and 22 and a partition plate 2.
4, 28a, 28b to form hot air gas chambers 21d and 22d separately surrounding the decomposition vessels 21 and 22,
These two chambers communicate with each other through a communication port 25 provided at one end of the partition plate 24.

Reference numeral 82 denotes a gas engine generator provided in a gas engine power generation facility 81 divided by a pyrolysis treatment facility 91 and a partition 103. The gas engine generator 82
3, a combustor 84 for supplying combustion gas to the gas turbine 83, an air compressor 85 driven by the gas turbine 83, a generator main body 86, and a fuel adjustment mixer 87. The exhaust gas discharged from the gas turbine 83 is introduced into a hot blast stove 39 as a heating means by the exhaust gas through an exhaust gas pipe 88 connected to the heating jacket HJ, and is mixed with the hot blast gas by the combustion burner 37. They are combined and used as a heat source for heating the decomposition vessels 21 and 22.

That is, the hot blast stove 39 raises the temperature to a predetermined temperature by the exhaust gas from the gas engine generator 82 and the hot blast gas from the combustion burner 37, and uses the raised hot blast gas as a heating heat source of the thermal decomposition means 20. The decomposition vessel 22 is heated to, for example, 600.degree. When the temperature of the decomposition container 22 reaches a predetermined temperature, the combustion burner 37 is controlled to be stopped or throttled. The exhaust gas temperature of the gas engine generator 82 (4
(00 to 550 ° C.), the combustion burner 37 is not required if the object can be thermally decomposed.

The cracked gas (carbonized gas or steam) generated during the heat treatment in the cracking vessels 21 and 22 is supplied to the steamy gas combustion furnace 40 provided at the lower portion of the cracking vessel 22 by the steam pipe 26 and the carbonized gas pipe. It is introduced by 27 and burned. Since the steam pipe 26 and the dry distillation gas pipe 27 are arranged and heated in the heating jacket HJ, it is possible to avoid problems such as the solidification and clogging of the organic components due to adhesion.

On the other hand, the decomposition vessel 21 is a furnace for drying and dechlorination. For example, air is introduced into a hot air gas from a temperature control air supply blower 44 so that the furnace can be heated at 350 ° C. Make adjustments. The hot-air gas discharged from the heating jacket HJ is partly circulated and reused. Others are discharged from the chimney via the heat exchanger.

Reference numeral 41 denotes a combustion burner for heating the gas-fired gas combustion furnace 40, which burns fuel to raise the temperature of the gas-fired gas combustion furnace 40 to 850 ° C. or higher and burns the decomposed gas to make it harmless. In order to introduce the cracked gas into the dry distillation gas combustion furnace 40, the cracked gas is drawn into the dry distillation gas combustion furnace 40 from the nozzle 43 by using the circulation blower 42.

Reference numeral 50 denotes a recovery means for recovering the residue thermally decomposed by the thermal decomposition means 20 (recovery means 95 in FIG. 1).
The residue collected by the collecting means 50 is separated by the separation device 3
Transported to zero. The residue transported to the separation device 30 is recovered as a reusable substance or separated as a processed material (carbide) to be further heated. If the substance is reusable, separate it and use it. If it is difficult to reuse it, treat it at the final disposal site.

In the case of a processed product to be subjected to a further heat treatment,
The charcoal combustion furnace 52 is introduced by using a conveying means 51 such as a pipe conveyor, where the processed material is burned and ashed. Exhaust gas generated during combustion in the carbide combustion furnace 52 is introduced into the carbonization gas combustion furnace 40 through the ash catcher 53 and burned. Exhaust gas after combustion in the carbonization gas combustion furnace 40 is
Steam and hot water are collected by the heat exchanger, and the temperature of the exhaust gas is reduced to 200 ° C. or lower. The exhaust gas is purified by a bag filter and discharged from the chimney through an exhaust blower.

Next, a series of heat treatments of the above embodiment will be described. First, before introducing an object to be treated such as digested sludge, the gas turbine 83 of the gas engine generator 82 is started, and exhaust gas from the gas turbine 83 is introduced into the hot blast stove 39. Hot air gas is generated by the combustion burner 37 as necessary, and a hot air gas of a predetermined temperature is obtained by both.

The hot air gas is supplied to the hot air gas inlet 54 → the lower hot air gas chamber 22 d → the communication port 25 → as shown by the arrow.
Decomposition containers 22 and 2 through hot air gas chamber 21d in the upper stage
After heating 1, a part thereof is introduced into the carbonization gas combustion furnace 40 by the circulation blower 42. Another part of the hot air gas is supplied to heat the compressed air of the gas turbine 83 of the gas engine generator 82. Further, other hot air gases are discharged from the chimney via the heat exchanger.

Now, when drying and dechlorination are performed in the upper decomposition vessel 21 and volume reduction by carbonization is performed in the lower decomposition vessel 22, the temperature in the lower decomposition vessel 22 is reduced by hot air gas. For example, the temperature is adjusted to be heated to 600 ° C. The temperature in the upper decomposition vessel 21 is, for example, 350 ° C.
The air for temperature adjustment is introduced into the hot air gas by the blower 44 as a temperature adjusting means so as to heat the hot air.

Then, after reaching a predetermined temperature (within one hour after the start-up), the object to be processed is charged from the charging means 10 and thermal decomposition is started. The cracked gas generated by the thermal decomposition is introduced into the dry distillation gas combustion furnace 40 through the steam conduit 26 and the dry distillation gas pipe 27, and is burned together with the circulating gas by the circulation blower 42.

The temperature in the lower decomposition vessel 22 is set to 60
In order to maintain the temperature at 0 ° C., it is necessary to raise the temperature in the hot air gas chamber 22d by 50 to 100 ° C., which cannot be increased at the exhaust gas temperature of the gas turbine. The insufficient temperature is supplemented by the combustion temperature of the combustion burner 37 for additional cooking. The combustion of the combustion burner 37 is set so that it can be stopped or throttled after reaching a predetermined temperature. In addition, the insufficient combustion temperature may be achieved by supplying an additional adjustment fuel such as LNG, LPG, kerosene, or heavy oil to the fuel adjustment mixer 87 in addition to the above, and supplying fuel to the exhaust gas pipe 88 for combustion. (Afterburner).

In the dechlorination treatment in the upper decomposition vessel 21, a treatment agent (chemical: powder of sodium hydrogen carbonate, for example) that forms a harmless chloride by contacting with an organic halogen compound is mixed with the material to be treated. The mixture fed from the feeding means 10 is heated. In this heat treatment, from the mixing ratio of the mixture to be treated, the processing conditions such as the temperature at which the harmful component is precipitated, the time, the amount of the deposition and the amount of the chemical that can be sufficiently removed by reacting with the harmful component are investigated in advance. The treatment is carried out at a temperature (200 ° C. to 350 ° C.) and time that can cover this.

Drying is performed in the upper decomposition vessel 21 and the generated organic halogen compound is contacted with the added chemical to produce harmless chlorides (such as sodium chloride). Make sure that no harmful organic halogen compounds (such as dioxins) remain in the gas.

As the treating agent to be mixed or added to the article to be treated, use is made of an alkali substance which reacts with an organic halogen compound, HCl (hydrogen chloride), to produce harmless chlorides (such as sodium chloride). For example, Japanese Patent Application Laid-Open No. 9-155326 and Japanese Patent Application Laid-Open No.
JP-A-10-235186, JP-A-10-235
No. 187, alkaline earth metal, alkaline earth metal compound, alkali metal, alkali metal compound,
Specifically, calcium, lime, slaked lime, calcium carbonate, dolomite, silicate (such as calcium silicate), sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, natural soda, sodium hydroxide, potassium hydroxide,
One of potassium hydrogen carbonate and potassium carbonate is selected, or several types are mixed and used. As an amount to be used, 5 to 30% by weight of the material to be treated is mixed or added.

For example, sodium bicarbonate (NaHC)
When O ₃ ) is used, a decomposition gas of the HCl component is generated in the dechlorination furnace, which is the first heat treatment furnace, but immediately reacts with sodium hydrogen carbonate to (NaHCO ₃ ) + (HCl) →
(NaCl) + (H ₂ O) + (CO ₂ ), producing harmless sodium chloride (NaCl) and eliminating harmful HCl from the decomposition gas. Thereby, the detoxification of the HCl component in the decomposed gas and the detoxification of the object to be treated are simultaneously performed.

The object to be treated after the harmful components are precipitated is sent to the lower decomposition vessel 22 via the flexible joint 23 as described above, where it is carbonized, and the carbide is recovered by the recovery means 50. Since there is no gas containing harmful components such as HCl and dioxins in the decomposition vessel 22, the carbide does not adsorb these harmful substances, so if it is necessary as harmless carbide or as fuel, etc. Can be reused.

The carbide generated as described above, that is, the carbonized processed product is introduced into a carbide (ashed) combustion furnace 52 for incineration and combustion by the transport means 51 and is burned. The combustion furnace 52 uses, for example, a rotary kiln-type combustion furnace, incinerates and burns the carbide introduced from one end while rotating it, and discharges the ash from the other end. The exhaust gas generated in the carbide combustion furnace 52 is introduced into the carbonization gas combustion furnace 40 via the ash catcher 53 and burns together with the steam and carbonization gas. The ash catcher 53 is for minimizing the movement of ash to the carbonization gas combustion furnace 40.

After reaching a predetermined temperature (within 1 hour after starting),
The object to be treated is charged, and thermal decomposition is started. The cracked gas generated by the thermal decomposition is introduced into the carbonization gas combustion furnace 40 via a conduit and burns at 850 ° C. or higher to render it harmless.

The reason why the dry distillation gas combustion furnace 40 and the carbide combustion furnace 52 are different from each other as in the above embodiment is as follows.

Since the exhaust gas burned in the dry distillation gas combustion furnace 40 is sucked by the exhaust blower after the bag filter, if both furnaces are integrally formed, the ash is sucked to the heat exchanger and the bag filter. This is to prevent the ash from being transported and to minimize the amount of ash contained in the exhaust gas and moving. The ash catcher 53
It is for the above-mentioned reason that the ash that moves to the carbonization gas combustion furnace 40 is reduced by providing the ash.

In the above embodiment, the dry distillation gas combustion furnace 40 may be formed separately, and the gas turbine may be constituted by an afterburner that sprays fuel onto exhaust gas to burn it. Further, the thermal decomposition means may be constituted by a rotary kiln system. In this case, the decomposition gas and the like generated in the reaction furnace (drying / dechlorination furnace, carbonization furnace) are steam pipes and carbonized gas pipes. Is introduced into the dry distillation gas combustion furnace. When each pipe is exposed to the atmosphere at this time, the organic matter generated by decomposition is cooled and adheres and solidifies on the pipe wall, causing blockage of the pipe.Therefore, the pipe is surrounded by a heating jacket, and hot air is blown from the carbonization gas combustion furnace. After being introduced, the temperature is kept at a temperature higher than the temperature used for thermal decomposition (for example, carbonization at 600 ° C.).

[0067]

As described above, according to the present invention, digestion gas is used as fuel for a gas engine installed in a gas engine power generation facility, and the exhaust gas of a gas engine generator that supplies electric power is thermally decomposed. By treating an object to be treated such as sludge using a heat source of a thermal decomposition furnace of a treatment facility, it is possible to particularly reduce running costs.

When the exhaust gas temperature of the gas engine generator is lower than the required temperature, the fuel for adjustment is supplied to the digestive gas, the fuel is supplied to the exhaust gas for combustion (afterburner), or By installing a post-cooking burner, the exhaust gas temperature of the gas engine generator (400
(550 ° C.) or more, and can be heated under temperature conditions suitable for the properties of the various objects to be treated, so that stable thermal decomposition can be performed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention in the form of blocks.

FIG. 2 is a schematic configuration explanatory view of a gas engine power generation facility and a pyrolysis treatment facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Input means 20 ... Thermal decomposition means 21, 22 ... Decomposition container 26 ... Decomposition gas conduit 27 ... Temperature adjustment means 30 ... Separation apparatus 37, 41 ... Combustion burner 39 ... Hot air furnace 40 ... Carbonization gas combustion furnace 50 ... Recovery means 51 ... Conveying means 52 ... Carbide combustion furnace 61 ... Sewage treatment facility 66 ... Sludge thickening tank 71 ... Digestion tank 81 ... Power generation facility 82 ... Gas engine generator 87 ... Fuel adjustment mixer 88 ... Exhaust gas pipe 91 ... Pyrolysis treatment facility 92 ... Pyrolysis furnace

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[Procedure amendment]

[Submission date] April 15, 2002 (2002.4.1
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 9

[Correction method] Change

[Correction contents]

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/027 ZAB F23G 5/027 ZABZ 5/14 ZAB 5/14 ZABF // F23G 7/04 ZAB 7 / 04 ZAB 601 601J

Claims (15)

[Claims] 1. A charging means for charging an object to be processed, a thermal decomposition means for moving the charged object while heating and thermally decomposing the same, and burning a decomposition gas generated during the heat treatment from the object to be processed. A pyrolysis treatment facility provided with a decomposition gas combustion means that performs fermentation of organic substances to obtain a digestion gas; and a gas engine power generation facility that obtains high-temperature exhaust gas serving as a heating source of the pyrolysis means. And a means for supplying the digestion gas obtained in the digestion tank as fuel to the gas engine power generation facility. 2. The thermal decomposition treatment facility according to claim 1, wherein the object to be treated includes digested sludge in a digestion tank. 3. The heat generated by a gas engine power generation facility using digestive gas according to claim 1, wherein fuel is injected into exhaust gas from the gas engine power generation facility and burned to obtain high-temperature hot air gas. Disassembly processing facility. 4. The gas using digestive gas according to claim 1, wherein exhaust gas from the gas engine power generation facility is introduced into a hot blast stove provided with a combustion burner to obtain synthetic hot blast gas. Pyrolysis treatment facility with engine power generation facility. 5. The pyrolysis facility according to claim 3, wherein the gas engine power generation facility comprises a gas turbine generator. 6. The thermal decomposition processing facility according to claim 3, wherein the gas engine power generation facility comprises a gas engine power generator. 7. The thermal decomposition means has a decomposition vessel provided with a means for introducing an object to be processed and agitating and transporting the object therein, and is indirectly heated from outside of the decomposition vessel by hot air gas. A thermal decomposition treatment facility using a gas engine power generation facility using digestive gas according to claim 1. 8. A gas engine power generation facility using digestive gas according to claim 1, wherein a plurality of decomposition vessels for introducing an object to be treated and performing indirect heating are arranged side by side. By pyrolysis treatment facility. 9. The gas engine using a digestion gas according to claim 1, wherein the plurality of decomposition vessels are individually surrounded by a heating jacket or are collectively surrounded. Pyrolysis treatment facility with power generation facility. 10. The gas engine power generation using digestive gas according to claim 5, wherein the air compressed by the compressor of the gas turbine generator is heated and introduced into the combustor of the gas turbine. Thermal decomposition treatment facility by facility. 11. A charging step of charging an object to be processed, a thermal decomposition step of moving the charged object while heating and thermally decomposing the same, and burning a decomposition gas generated during the heat treatment from the processing object. A digestion gas obtained by fermenting organic substances in a digestion tank and supplying it to a gas engine power generation facility as fuel to obtain electric power and high-temperature exhaust gas. Using the obtained high-temperature exhaust gas as a heating source, the object to be treated is thermally decomposed in the pyrolysis step, the decomposition gas generated by the heat decomposition is burned in a carbonization gas combustion furnace, and the exhaust gas is purified and discharged. A pyrolysis treatment method using a digestion gas in a gas engine power generation facility. 12. The method according to claim 11, wherein the object to be treated includes digested sludge. 13. The exhaust gas from a gas engine power generation facility,
The thermal decomposition treatment method by a gas engine power generation facility using a digestion gas according to claim 11, wherein fuel is injected into the exhaust gas and burned to produce a high-temperature hot air gas. 14. The exhaust gas from a gas engine power generation facility
12. The method of claim 11, wherein the gas is introduced into a hot blast stove provided with a combustion burner to produce synthetic hot blast gas. 15. A heat treatment is carried out by adding a treating agent which reacts with an organic halogen substance generated by thermal decomposition to form harmless chloride to an object to be treated. Item 14. A thermal decomposition treatment method using a digestion gas by a gas engine power generation facility.