JP3952702B2 - Pyrolysis treatment facility using gas engine power generation facility using digestion gas - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a heating facility in a thermal decomposition processing technology for reducing the volume (drying, carbonization, ashing) of an object to be treated which is waste such as sludge by a gas engine generator (gas turbine, gas The power obtained by installing the engine and generating electricity is used as the power source for the installed equipment in the facility, and the main fuel of the gas engine is digested gas (methane gas and carbon dioxide gas) obtained by digesting sludge. The digestive gas is used to reduce the total energy running cost by using the exhaust gas generated from the gas engine generator as a heating means for thermal decomposition of the workpiece. It relates to the thermal decomposition treatment facility by the gas engine power generation facility.
[0002]
[Prior art]
Various types of waste are increasing year by year, and various techniques have been proposed for the treatment. One of the wastes is heated and pyrolyzed, the cracked gas and pyrolysis residue generated by pyrolysis are combusted, the resulting ash is processed into molten slag, and the heat energy generated by combustion (exhaust gas) It is known that gas → steam) is utilized in a power generation device to convert thermal energy into electric power and recover it.
[0003]
Further, it is known that exhaust gas generated while obtaining electric power by a gas turbine generator is used as a heat source for thermal decomposition of waste (Japanese Patent Laid-Open Nos. 8-49821, 8-49822, 11). -18221).
[0004]
Furthermore, Japanese Patent Laid-Open No. 5-264040 is known as an example of supplying additional fuel to the exhaust gas of a gas turbine to promote combustion.
[0005]
Furthermore, Japanese Patent Application Laid-Open No. 2000-337171 discloses a method of generating power by supplying a carbonized gas obtained by carbonizing waste as a gas turbine fuel.
[0006]
In addition, JP-A-5-288327, JP-A-2000-331701, JP-A-9-88630, and JP-A-7-204697 are known as examples of generating electricity by operating a gas engine using digestion gas as fuel. Yes.
[0007]
[Problems to be solved by the invention]
As described above, using the exhaust gas of the gas turbine as a heat 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 about 450 to 600 ° C., and is not necessarily a sufficient temperature as the thermal decomposition temperature of the object to be processed.
[0008]
That is, in actual heat treatment, the temperature required for thermal decomposition depends on the properties of the object to be processed, but is a temperature that requires 350 to 700 ° C., and about 50 to 100 ° C. is due to heat radiation from the equipment. As a result, the temperature required for the thermal decomposition may not be ensured.
[0009]
Furthermore, since this thermal decomposition temperature varies depending on the properties of the object to be processed, it is difficult to perform stable thermal decomposition.
[0010]
Moreover, there is a problem that the time to reach a predetermined temperature at which the processing object starts to be input becomes long only by the temperature of the exhaust gas of the gas turbine. Although it is possible to raise the temperature of the exhaust gas by devising the gas turbine itself, it is difficult to use this temperature stably for a long time in terms of thermal durability. As a result, frequent stoppages due to maintenance and inspections result in increased running costs, which is not a good idea.
[0011]
Furthermore, if the object to be processed is burned as it is, the object to be processed contains various substances and moisture, so that it is difficult to stably burn, incomplete combustion is likely to occur, and there is a problem of lack of safety. .
[0012]
In particular, in the case of Japanese Patent Laid-Open No. 2000-337171, it is intended to reduce the fuel cost by generating power using dry distillation gas as fuel, but there are a wide variety of combustible components of dry distillation gas obtained by the properties of waste. Therefore, it is difficult to perform stable power generation.
[0013]
The present invention has been made in view of the above circumstances, and uses digestion gas such as methane gas by organic matter fermentation as fuel for a gas engine, and uses exhaust gas from a gas engine such as a gas turbine equipped with a generator or a gas engine. Use as a heat source for the thermal decomposition means, and if the heat source is insufficient, burn the digestion gas with a combustion burner as a heat source for the thermal decomposition means, obtain hot air gas and treat the object to be treated such as sludge Therefore, the fuel cost can be reduced, the running cost can be reduced, and the power in the facility can be secured by generating power with the gas engine generator, and the temperature conditions are adjusted to the properties of various objects to be processed. It is an object to provide a thermal decomposition treatment facility using a gas engine power generation facility that uses digestion gas that can be heated and can perform stable thermal decomposition.
[0014]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention uses an exhaust gas (a temperature of 450 to 600 ° C.) of a gas engine such as a gas turbine equipped with a generator or a gas engine to heat an object to be decomposed. Is to do. In such a configuration, power is generated by the gas engine to secure the power in the facility, and as the fuel, digestion gas such as methane gas by organic matter fermentation is used. Digestion gas is a mixed gas of methane gas (about 60%) and carbon dioxide gas (about 40%), and its calorific value is about 5000-8000kcal / m ^Three And the calorific value of natural gas consisting only of methane (about 4000kcal / m ^Three However, the property is relatively stable, but the gas engine is operated using digestion gas as fuel to obtain electric power. Exhaust gas generated by the operation of the gas engine is used to heat the object to be treated such as digested sludge to cause thermal decomposition. That is, for example, in a sewage treatment plant facility, there is a system in which sludge is fermented to obtain digested gas and used as fuel, the remaining digested sludge is pyrolyzed to remove organic substances, and the remaining residue can be effectively used. Made it possible to build.
[0015]
In addition, if you want to perform stable thermal decomposition (thermal decomposition at high temperature) suitable for the object to be processed, or if you want to perform stable operation even if there is a change in digestion gas, exhaust gas temperature In order to secure it, digestion gas is introduced as an additional fuel, and another combustion means is added.
[0016]
In other words, when the exhaust gas temperature of the gas engine alone is insufficient for the heating temperature suitable for the object to be processed, it is used in combination with a combustion burner, or combustion is performed by adding fuel to the exhaust gas of the gas engine ( Afterburner) to obtain hot air gas at a desired temperature. Digestion gas is used as fuel.
[0017]
Furthermore, attention has been paid to the stable ashing of the object to be processed by burning and ashing the object to be processed (carbide) obtained by pyrolyzing the object to be processed.
[0018]
That is, when effective use of carbides cannot be found, attention has been paid to the fact that combustion is performed safely and stably through the process of processing object → carbonization → ashing. In short, the gas engine generator uses the digestion gas as a fuel and generates electricity, and the obtained power is used to operate the facility. The exhaust gas obtained from the operation of the gas engine is used as waste such as sludge. A certain object to be treated was heated. The means for solving the problem will be described below.
[0019]
First, an input means for supplying an object to be processed, a thermal decomposition means for moving the input object to be processed while it is heated and thermally decomposing, and a cracked gas for burning a decomposition gas generated from the object to be processed during the heat treatment A thermal decomposition treatment facility equipped with combustion means,
A digester to ferment organic substances to obtain digestion gas;
A gas engine power generation facility for obtaining high-temperature exhaust gas to be a heating source of the thermal decomposition means;
The digestion gas obtained in the digestion tank is supplied as fuel to the gas engine power generation facility to obtain electric power and high-temperature exhaust gas, and also includes means for obtaining hot air gas by combustion with the obtained exhaust gas and additional fuel. It is characterized by this.
[0020]
The additional fuel is digestion gas or digestion gas and gaseous fuel Or It consists of a mixture of digestion gas and liquid fuel, and the object to be treated contains digested sludge in the digestion tank.
[0021]
Fuel is injected into the exhaust gas from the gas engine power generation facility and burned to obtain a hot hot air gas. Further, the exhaust gas from the gas engine power generation facility is transferred to a hot stove equipped with a combustion burner by the burner. Additional fuel Is burned and introduced to obtain a synthetic hot air gas. further, Additional fuel In the digestion gas or digestion gas and gaseous fuel Or It consists of a mixture of digestion gas and liquid fuel.
[0022]
The thermal decomposition means has a decomposition container provided with a means for introducing a workpiece into the interior and agitating and conveying it, and is indirectly heated by hot air gas from the outside of the decomposition container.
[0023]
In addition, a plurality of decomposition containers for introducing the object to be processed and indirectly heating the same are arranged side by side. Further, a plurality of disassembly containers are individually surrounded by a heating jacket or collectively surrounded.
[0024]
In addition, when the processed product after thermal decomposition is burned and ashed, the generated exhaust gas is preferably introduced into the cracked gas combustion means and burned.
[0025]
In addition, it is preferable to add a treatment agent (chemical) that produces a harmless chloride by contact reaction with an organic halogen substance generated by thermal decomposition to the object to be treated. Detoxification treatment of heat treatment facilities can be realized.
[0026]
At least one of alkali metal, alkali metal compound, alkaline earth metal, and alkaline earth metal compound is selected or mixed with two or more of the above agents.
[0027]
Alkali metal compounds are lithium, sodium, potassium, rubidium, potassium oxide, hydroxide, bicarbonate, carbonate, silicate, phosphate, aluminate, nitrate, sulfate.
[0028]
Specific examples of the alkali metal compound treating agent include sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, natural soda, potassium carbonate, potassium hydrogen carbonate, sodium carbonate potassium, sodium hydroxide, and potassium hydroxide. Sodium hydrogen carbonate includes acidic sodium carbonate, sodium bicarbonate, sodium bicarbonate,
Sodium carbonate includes sodium carbonate, soda, soda ash, laundry soda, and crystalline soda.
As sodium sesquicarbonate, sodium bicarbonate-sodium bicarbonate, sodium bicarbonate, sodium sesquicarbonate,
As natural soda, Trona is used.
[0029]
Treatment agent for alkaline earth metal compound is lime (CaO)
Slaked lime (Ca (OH) ₂ ), Calcium carbonate (CaCO _Three )
Dolomite (CaCO _Three ・ MgCO _Three ).
[0030]
Li, Na, K, Rb, Cs, and Fr are used as the alkali metal treating agent.
[0031]
Ca, Sr, Ba, Ra is used as the alkaline earth metal treatment agent.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a thermal decomposition treatment facility using a gas engine power generation facility using digestion gas according to an embodiment of the present invention. In FIG. 1, 61 is a sewage treatment facility, 71 is a digestion tank, and 81 is a gas engine power generation. A facility 91 is a thermal decomposition treatment facility (details will be described later).
[0033]
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 66. In the sewage treatment facility 61, the inflow water 62 containing semi-fluid organic substances such as sewage sludge and garbage is introduced into the settling basin 63 to precipitate a part of the semi-fluid organic substances as sludge and It introduces into the aeration tank 64. Thereafter, the water introduced into the aeration tank 64 is treated in the tank 64 and then introduced into the final sedimentation tank 65. In this final sedimentation basin 64, the supernatant water is discharged, and the sedimented sludge is returned to the aeration tank 64 as return sludge. The sludge is concentrated.
[0034]
In the sewage treatment facility 61 as described above, semi-fluid organic substances such as sewage sludges and garbage are treated, and the obtained concentrated sludge is introduced into the digestion tank 71 and fermented, and methane is the main component. And get digestion gas. The obtained digested gas is supplied to the desulfurization device 72 to remove sulfur, and is stored in the high-pressure tank 75 via the gas holder 73 and the compressor 74. The gas in the gas engine power generation facility 81 passes through this high-pressure tank 75. Fuel is supplied to the engine generator 82 (gas engine generator or gas turbine generator) via a fuel adjustment mixer, which will be described later. For example, power is obtained by driving the gas engine generator to generate power. .
[0035]
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 adjustment mixer 87. The exhaust gas generated in the gas turbine 83 is exhausted. It is used as a heating source for the pyrolysis furnace 92 in the pyrolysis treatment facility 91 via the gas pipe 88.
[0036]
In addition, when the exhaust gas temperature of the gas engine generator 82 is lower than the required temperature, the LNG, LPG, kerosene, heavy oil, etc. Additional fuel Or to exhaust gas The fuel Is provided to burn (after burner). However, even in this case, the exhaust gas temperature of the gas engine generator 82 is often lower than the required temperature. Therefore, the reheating burner 93 that burns the digested gas stored in the high-pressure tank 75 is used as the pyrolysis furnace 92. A hot air gas having a desired temperature is obtained by means such as installing in the air. Of the above-mentioned additional cooking burner 93 Additional fuel In addition to digestion gas, digestion gas was mixed with LNG, LPG, kerosene, heavy oil, etc. Additional fuel Can be used.
[0037]
An object to be treated such as digested sludge in the digestion tank 71 is fed into the pyrolysis furnace 92 in the pyrolysis treatment facility 91 through the drying means 94. The hot air gas that has passed through the pyrolysis furnace 92 is supplied to the drying means 94 as hot air gas for drying the object to be processed, thereby drying the object to be processed. Further, the residue treated in the pyrolysis furnace 92 is recovered by the recovery means 95. In this case, if it can be used effectively, it is used separately. If it is difficult to use, it is processed at the final disposal site.
[0038]
Next, a schematic configuration explanatory diagram of the gas engine power generation facility 81 and the thermal decomposition treatment facility 91 will be described. FIG. 2 is a conceptual diagram of the thermal decomposition treatment facility 91 provided with the gas engine generator 82 in the gas engine power generation facility 81. In this embodiment, the decomposition containers equipped with screw type stirring and conveying means are stacked in two stages.
[0039]
In FIG. 2, reference numeral 10 denotes an input means for inputting an object to be processed such as the digested sludge described above, and includes a hopper 11 and a screw conveyor 12 driven by a motor M.
[0040]
Reference numeral 20 denotes a thermal decomposition means (a thermal decomposition furnace 92 and a drying means 94 in FIG. 1) that heats and decomposes an object to be treated such as digested sludge, and the thermal decomposition means 20 includes two decomposition containers arranged vertically. 21 and 22, the workpiece to be processed is introduced from the supply port 21 a at one end of the upper decomposition vessel 21, transferred to the discharge port 21 c while being stirred by the conveying means 21 b, and the lower decomposition vessel is connected via the flexible joint 23. 22 is carried from the supply port 22a to the discharge port 22c while being stirred by the conveying means 22b of the decomposition container 22, and discharged from the discharge port 22c. The conveying means 21b and 22b are composed of screws or spiral conveyors, and are respectively motor M. ₁ And M ₂ Is driven to rotate.
[0041]
The decomposition containers 21 and 22 are each heated by an external heating means. This external heating means forms a hot air gas chamber 21d and 22d that separates the decomposition containers 21 and 22 by partitioning the heating jacket HJ covering the entire decomposition containers 21 and 22 with partition plates 24, 28a, and 28b. Both chambers communicate with each other through a communication port 25 provided on one end side of the partition plate 24.
[0042]
82 is a gas engine generator provided in a gas engine power generation facility 81 partitioned by a thermal decomposition treatment facility 91 and a partition wall 103. The gas engine generator 82 is configured to supply a gas turbine 83 and combustion gas to the gas turbine 83. A combustor 84 to be supplied, an air compressor 85 driven by a gas turbine 83, a generator main body 86, and a fuel adjustment mixer 87 are configured. The exhaust gas discharged from the gas turbine 83 is introduced into the hot stove 39 as a heating means by the exhaust gas through an exhaust gas pipe 88 connected to the heating jacket HJ, and is stored in the high-pressure tank 75. The digested gas is used as a heat source for heating the decomposition containers 21 and 22 by being combined with hot air gas by the additional combustion burner 93 that burns the digested gas.
[0043]
That is, the hot stove 39 is raised to a predetermined temperature by the exhaust gas from the gas engine generator 82 and the hot air gas from the additional combustion combustion burner 93, and uses the raised hot air gas as a heating heat source of the thermal decomposition means 20, The decomposition container 22 is heated to 600 ° C., for example. When the decomposition container 22 reaches a predetermined temperature, the additional cooking combustion burner 93 is controlled to stop or squeeze. In addition, if it is a to-be-processed object which can be thermally decomposed by the exhaust gas temperature (450-600 degreeC) of the gas engine generator 82, the additional cooking combustion burner 93 is unnecessary.
[0044]
The cracked gas (dry distillation gas or water vapor) generated during the heat treatment in the cracking containers 21 and 22 is introduced into the dry distillation gas combustion furnace 40 provided at the lower part of the cracking container 22 through the steam pipe 26 and the dry distillation gas pipe 27. And burned. Since the steam pipe 26 and the dry distillation gas pipe 27 are disposed in the heating jacket HJ and heated, problems such as organic components adhering and solidifying and blocking can be avoided.
[0045]
On the other hand, the decomposition vessel 21 is a furnace that performs drying and dechlorination. For example, air is introduced into the hot air gas from the temperature adjustment air supply blower 44 so that the furnace can be heated at 350 ° C. . A part of the hot air gas emitted from the heating jacket HJ is circulated and reused. Others are discharged from the chimney through a heat exchanger.
[0046]
41 is a combustion burner for heating the gas distillation gas combustion furnace 40, Additional fuel (LNG, LPG, kerosene, heavy oil, digestion gas) is burned to raise the temperature of the dry distillation gas combustion furnace 40 to 850 ° C. or more, and the cracked gas is burned to make it harmless. In order to introduce the cracked gas into the dry distillation gas combustion furnace 40, the cracking gas is attracted from the nozzle 43 into the dry distillation gas combustion furnace 40 using the circulation blower 42.
[0047]
Reference numeral 50 denotes a recovery means (recovery means 95 in FIG. 1) for recovering the residue pyrolyzed by the thermal decomposition means 20, and the residue recovered by the recovery means 50 is conveyed to the separation device 30. The residue conveyed to the separation device 30 is collected as a reusable substance or separated as a processed product (carbide) to be further heated. If the material is reusable, separate it and use it at the final disposal site if it is difficult to reuse.
[0048]
Further, in the case of a processed product to be further heat-treated, a carbide combustion furnace 52 is introduced using a conveying means 51 such as a pipe conveyor, where the processed product is burned and ashed. Exhaust gas generated during combustion in the carbide combustion furnace 52 is introduced into the dry distillation gas combustion furnace 40 through the ash catcher 53 and burned. The exhaust gas after combustion in the dry distillation gas combustion furnace 40 collects steam and hot water by a heat exchanger and lowers the exhaust gas temperature to 200 ° C. or less. The exhaust gas is purified by a bag filter and passed through an exhaust blower. Discharged from the chimney.
[0049]
Next, a series of heat treatments in 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 the exhaust gas from the gas turbine 83 is introduced into the hot stove 39. If necessary, hot air gas is generated by the additional combustion burner 93 for digestion gas combustion, and hot air gas of a predetermined temperature is obtained by both.
[0050]
As shown by the arrows, this hot air gas is heated by the hot air gas inlet 54 → the lower hot air gas chamber 22d → the communication port 25 → the upper hot air gas chamber 21d and then a part of the hot air gas is heated. It is introduced into the dry distillation gas combustion furnace 40 by the circulation blower 42. The other 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 through the heat exchanger.
[0051]
Now, when drying / dechlorination treatment is performed in the upper decomposition vessel 21 and volume reduction treatment by carbonization is performed in the lower decomposition vessel 22, the temperature in the lower decomposition vessel 22 is set to 600, for example, with hot air gas. Adjust to heat to ° C. For example, the temperature in the upper decomposition vessel 21 is adjusted to lower the temperature by introducing air for temperature adjustment into the hot air gas by the blower 44 as temperature adjusting means so as to be heated to 350 ° C.
[0052]
Then, after reaching the predetermined temperature (within 1 hour after activation), the object to be processed is input from the input means 10 and thermal decomposition is started. The cracked gas generated by the thermal cracking is introduced into the dry distillation gas combustion furnace 40 through the steam conduit 26 and the dry distillation gas pipe 27 and burned together with the circulation gas by the circulation blower 42.
[0053]
In order to maintain the temperature in the lower decomposition vessel 22 at 600 ° C., the temperature in the hot air gas chamber 22d needs to be 50 to 100 ° C. higher than that, and can be increased at the exhaust gas temperature of the gas turbine. I can't. The insufficient temperature is cooked up and compensated with the combustion temperature of the combustion burner 93. The combustion of the combustion burner 93 is set so that it can be stopped or throttled after reaching a predetermined temperature. In addition, in addition to the above, the shortage combustion temperature may be caused by the fuel adjustment mixer 87 such as LNG, LPG, kerosene, heavy oil, etc. Additional fuel To the exhaust gas pipe 88. The fuel May be supplied and burned (afterburner).
[0054]
The dechlorination treatment in the upper decomposition vessel 21 is performed by mixing the treatment object with a treatment agent (chemical: for example, sodium hydrogen carbonate powder) that produces a harmless chloride by contact reaction with an organic halogen compound. The mixture charged from 10 is heat-treated. This heat treatment is carried out in advance by examining the processing conditions such as the temperature at which the harmful components are deposited, the time, the amount deposited, and the amount of chemicals that can be removed sufficiently by reacting with the harmful components, based on the mixing ratio of the mixed materials to be treated. Then, it is treated at a temperature (200 ° C. to 350 ° C.) and time that can cover this.
[0055]
The upper decomposition vessel 21 is dried, and the generated organic halogen compound and the added chemical are contact-reacted to generate harmless chlorides (such as sodium chloride). Prevent harmful organic halogen compounds (such as dioxins) from remaining.
[0056]
As the treating agent to be mixed or added to the object to be treated, an alkaline substance that produces a harmless chloride (such as sodium chloride) by contact reaction with HCl (hydrogen chloride) of an organic halogen compound is used. For example, as shown in JP-A-9-155326, JP-A-10-43731, JP-A-10-235186, and JP-A-10-235187 filed earlier by the applicant of the present application, alkaline earth metal, alkaline earth Metal compounds, alkali metals, alkali metal compounds, specifically calcium, lime, slaked lime, calcium carbonate, dolomite, silicates (calcium silicate, etc.), sodium bicarbonate, sodium carbonate, sodium sesquicarbonate, natural soda, Select one from sodium hydroxide, potassium hydroxide, potassium bicarbonate, potassium carbonate, or use a mixture of several. As a usage-amount, 5 to 30 weight% is mixed or added with respect to a to-be-processed object.
[0057]
For example, the above sodium bicarbonate (NaHCO _Three ), The decomposition gas of the HCl component is generated in the dechlorination furnace, which is the first heat treatment furnace, but it immediately reacts with sodium hydrogen carbonate (NaHCO3). _Three ) + (HCl) → (NaCl) + (H ₂ O) + (CO ₂ ), Producing harmless sodium chloride (NaCl) and eliminating harmful HCl from the cracked gas. Thereby, detoxification of the HCl component in the cracked gas and detoxification of the object to be processed are performed at the same time.
[0058]
The object to be treated after depositing this harmful component is sent to the lower decomposition vessel 22 through 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, carbides do not adsorb these harmful materials, so if they are necessary as harmless carbides, fuels, etc. Can be reused.
[0059]
The carbide generated as described above, that is, the carbonized processed product, is introduced into the carbide (ashing) combustion furnace 52 and burned for ashing combustion by the transport means 51. The combustion furnace 52 uses, for example, a rotary kiln type combustion furnace, burns and ashes the carbide introduced from one end, and discharges the ash from the other end. The exhaust gas generated in the carbide combustion furnace 52 is introduced into the dry distillation gas combustion furnace 40 through the ash catcher 53 and burned together with the water vapor / dry distillation gas. Moreover, the ash catcher 53 is for suppressing the movement of the ash to the dry distillation gas combustion furnace 40 as much as possible.
[0060]
After reaching a predetermined temperature (within 1 hour after startup), the workpiece is introduced and thermal decomposition is started. The cracked gas generated by the thermal decomposition is introduced into the dry distillation gas combustion furnace 40 through a conduit and burned at 850 ° C. or more to make it harmless.
[0061]
The reason why the dry distillation gas combustion furnace 40 and the carbide combustion furnace 52 are separately configured as in the above-described embodiment is as follows.
[0062]
Since the exhaust gas burned in the dry distillation gas combustion furnace 40 is sucked by the exhaust blower after the bag filter, when both furnaces are integrally formed, ash is sucked and carried to the heat exchanger and the bag filter. This is to prevent this and to minimize the ash content contained in the exhaust gas and moving. For the above reason, the ash catcher 53 is provided to reduce the ash moving to the dry distillation gas combustion furnace 40.
[0063]
In the above-described embodiment, the dry distillation gas combustion furnace 40 may be separately installed, and the gas turbine may be configured by an afterburner that additionally burns the exhaust gas by spraying fuel. Further, as the thermal decomposition means, a rotary kiln system may be used. In this configuration, cracked gas generated in the reaction furnace (drying / dechlorination furnace, carbonization furnace) is a steam pipe, a dry distillation gas pipe, etc. Is introduced into the dry distillation gas combustion furnace. At this time, if each pipe is exposed to the atmosphere, the decomposed organic matter is cooled and adheres and solidifies on the pipe wall, causing the pipe to be blocked, so it is surrounded by a heating jacket, and hot air is blown from the dry distillation gas combustion furnace. It is introduced and heated and kept at a temperature equal to or higher than the temperature used for thermal decomposition (for example, carbonization 600 ° C.).
[0064]
【The invention's effect】
As described above, according to the present invention, the digestion gas is used as the fuel of the gas engine installed in the gas engine power generation facility, and the exhaust gas of the gas engine generator that supplies electric power is pyrolyzed in the thermal decomposition treatment facility. By using digestion gas as a fuel for combustion burner to obtain hot air gas as a heating source to treat the object to be treated such as sludge, in order to make up for the heat source that is used as the heat source of the furnace, the running cost is reduced. Can be reduced.
[0065]
Also, to get the exhaust gas at the desired temperature, Additional fuel By using digestion gas, a facility with a low running cost can be obtained. That is, if the exhaust gas temperature of the gas engine generator is lower than the required temperature, Additional fuel Or exhaust gas The fuel Hot air gas that is higher than the exhaust gas temperature (450-600 ° C) of the gas engine generator by supplying gas and burning (afterburner), or by installing a re-cooking burner for digestion gas in the pyrolysis facility Can be obtained, and can be heated under temperature conditions according to the properties of 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 blocks.
FIG. 2 is a schematic configuration explanatory diagram of a gas engine power generation facility and a thermal decomposition treatment facility.
[Explanation of symbols]
10: Input means
20 ... Pyrolysis means
21, 22 ... decomposition container
26 ... cracked gas conduit
27 ... Temperature adjusting means
30 ... Sorting device
39 ... Hot stove
40 ... dry distillation gas combustion furnace
41 ... Combustion burner
50 ... Recovery means
51. Conveying means
52. Carbide combustion furnace
61 ... Sewage treatment facility
66 ... Sludge concentration tank
71 ... digester
72 ... Desulfurization equipment
75 ... High pressure tank
81 ... Power generation facility
82 ... Gas engine generator
87 ... Fuel adjustment mixer
88 ... Exhaust gas piping
91 ... Pyrolysis treatment facility
92 ... Pyrolysis furnace
93 ... Additional combustion burner

Claims (6)

An input means for supplying an object to be processed, a thermal decomposition means for moving the input object to be processed while it is heated and thermally decomposing, and a cracked gas combustion means for burning a decomposition gas generated from the object to be processed during the heat treatment A thermal decomposition treatment facility equipped with
A digester to ferment organic substances to obtain digestion gas;
A gas engine power generation facility for obtaining high-temperature exhaust gas to be a heating source of the thermal decomposition means;
The digestion gas obtained in the digestion tank is supplied as fuel to the gas engine power generation facility to obtain electric power and high-temperature exhaust gas, and also includes means for obtaining hot air gas by combustion with the obtained exhaust gas and additional fuel . in the pyrolysis treatment facilities by gas engine power generation facility using the digestion gas,
The pyrolysis treatment facility using a gas engine power generation facility using digestion gas, wherein the additional fuel is digestion gas or a mixture of digestion gas and gas fuel or digestion gas and liquid fuel. The thermal decomposition treatment facility by a gas engine power generation facility using digestion gas according to claim 1, wherein the object to be treated includes digested sludge in a digestion tank. 2. The digested gas according to claim 1, wherein the exhaust gas from the gas engine power generation facility is obtained by combusting and introducing additional fuel into a hot blast furnace equipped with a combustion burner to obtain a synthetic hot blast gas. Pyrolysis treatment facility by gas engine power generation facility using 4. The thermal decomposition treatment facility by a gas engine power generation facility using digestion gas according to claim 3 , wherein the additional fuel is digestion gas or a mixture of digestion gas and gas fuel or digestion gas and liquid fuel. Exhaust gas generated upon incineration of the processed material after pyrolysis claim 1, characterized in that so as to burn by introducing the decomposed gas burning means according to any one of claims 3 Pyrolysis treatment facility using gas engine power generation facility using digestion gas. The object to be treated, any of claims 1 to 3, characterized in that to perform addition to heating the treatment agent to produce a harmless chloride and catalytic reaction with an organic halogen substances generated by thermal decomposition A thermal decomposition treatment facility using a gas engine power generation facility using the digestion gas according to claim 1 .

Images