JP3951587B2 - Pyrolysis treatment facility and operation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal decomposition treatment facility and a method for operating the same, in which waste to be treated is thermally decomposed by indirect heat treatment and reduced in volume (by drying, carbonization, ashing, etc.). The present invention relates to a technique for removing attached matter (dust, decomposed product, etc.) and cleaning the inside.
[0002]
[Prior art]
Various objects to be treated (for example, waste, various kinds of dried products, ashed materials, etc.) containing a combustible component are heat-treated by various methods. For example, it is a common practice to put an object to be processed into a heating vessel, pyrolyze it by dry distillation (steaming) by heating from outside, separate it into cracked gas and carbide, obtain a carbide and use it as a resource. ing.
[0003]
In this case, the amount of combustible components contained in the treated products varies widely, but various types of waste (general waste, industrial waste, etc.), sludge, incineration ash, fly ash, contaminated soil, construction waste, There are various types such as various shredder dust, metal scrap, and organic substances.
[0004]
There is also known a method in which an object to be processed is put into a rotary kiln and the object to be processed in the rotary kiln is processed under a predetermined temperature condition by indirect heating (for example, Japanese Patent Application Laid-Open No. 11-344213). A batch type is also known (JP-A-6-269760).
[0005]
On the other hand, the inventors of the present invention have made it possible for organic chlorine compounds (hydrogen chloride), which are organic substances (halogen substances such as chlorine), to perform “suppression of generation” instead of the conventional “suppression of emissions”, thereby producing hydrogen chloride, etc. It has been proposed to suppress the generation of harmful substances, detoxify exhaust gas, detoxify residues, and reduce damage to treatment equipment by chlorine. (For example, JP-A-9-155326, JP-A-10-43713, JP-A-10-235186, JP-A-10-235187, etc.).
[0006]
In this way, when the object to be treated is not subjected to combustion treatment, but is subjected to dry distillation treatment, the heat treatment generates cracked gas containing a combustible component such as tar, and this treatment is also required.
[0007]
In other words, in a thermal decomposition facility that reduces the volume (drying, carbonization, ashing, etc.) of an object such as waste by indirect heat treatment, the sublimated substance in the decomposed decomposition gas is cooled by the needle. There is a risk of causing solidification as solid crystals and further causing problems such as unburned tar, ash, fine solids, etc. adhering and solidifying on the inner wall of the gas conduit to block the gas conduit and cause local combustion.
[0008]
Conventionally, in order to solve these problems, a cleaning device has been provided in the gas conduit to remove dust that adheres and accumulates (Japanese Patent Laid-Open No. 2000-136387), or the gas conduit is kept at a predetermined temperature. It has been proposed to prevent adhesion (Japanese Patent Laid-Open No. 10-205726).
[0009]
[Problems to be solved by the invention]
Although it is possible to expect the effect of removing deposits by installing a cleaning device on the above gas conduit and removing it by mechanical means, it becomes an obstacle to the flow path and becomes a resistance of the gas flow path. Will adhere.
[0010]
In addition, although the method of keeping the gas conduit at a predetermined temperature can be expected to prevent adhesion by keeping warm, the problem is that it may be attached and solidified during the cooling process when the operation is stopped.
[0011]
This invention is made | formed in view of such a subject, and it aims at providing the technique which can be easily cleaned using the existing exhaust blower.
[0012]
[Means for Solving the Problems]
As a result of various studies to solve the above problems, it has been found that deposits can be removed by using an exhaust blower and introducing high-speed air at the start of operation to ventilate.
[0013]
In addition, in order not to grow and solidify even if it adheres, it is possible to further improve the removal of the adhering matter, particularly if the cracking gas conduit is kept warm at a temperature equal to or higher than the cracking gas temperature generated from the object to be processed. understood.
[0014]
The present invention has been made based on these findings. That is, the heat treatment facility of the present invention that solves the above problems includes a transport means for transporting the object to be processed, a thermal decomposition means for reducing the volume of the object to be processed by external indirect heating, and a residue for recovering the generated residue. Treatment means, cracked gas combustion means for burning the generated cracked gas, cracked gas conduit means for guiding the cracked gas generated by the thermal cracking means to the cracked gas combustion means, and exhausting the exhaust gas burned by the cracked gas combustion means An exhaust blower means, and a deposit removal means having an open / close door in the flow path of the object to be processed and / or the cracking gas conduit means in the thermal decomposition processing means, and the exhaust blower means is activated to The inside of the gas flow path with the exhaust blower means is sucked and depressurized for a certain period of time, and after a predetermined pressure reduction, the door of the deposit removing means is opened and air is rapidly introduced into at least the cracked gas conduit means. In Rukoto, and removing deposits of at least the decomposition gas in the conduit.
[0015]
The deposit removing means is preferably provided on the input side and / or the discharge side of the object to be processed of the heat treatment furnace in the thermal decomposition processing means.
[0016]
The cracked gas conduit means comprises a cracked gas conduit and a heat insulating tube surrounding the cracked gas conduit, and a hot gas having a temperature equal to or higher than the temperature of the cracked gas generated by the thermal decomposition processing means is introduced into the heat insulating tube. To do.
[0017]
Although the temperature of the decomposition gas generated from the object to be processed varies depending on the nature of the object to be processed, for example, in the case of 350 ° C. to 400 ° C., it is desirable that the temperature be higher.
[0018]
Furthermore, since the exhaust gas discharged from the cracked gas combustion means is a high temperature of about 850 ° C., if the hot gas introduced into the heat insulation pipe is branched and used at a low temperature, the exhaust gas can be effectively used. Can be planned.
[0019]
The operation method of the above thermal decomposition treatment facility is that the exhaust blower means is activated to suck and depressurize the gas flow path between the thermal decomposition treatment means and the exhaust blower means for a certain period of time, At least the deposits in the cracked gas conduit are removed by opening the open / close door of the removing means and rapidly introducing air into at least the cracked gas conduit means.
[0020]
It is desirable that the opening / closing door of the deposit removing means is opened at the start of heat treatment operation (every operation start).
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0022]
FIG. 1 shows a conceptual diagram of the thermal decomposition treatment facility of the present invention. In the figure, reference numeral 1 denotes a crushing means for crushing an object to be processed, and 2 denotes a metal removing means for removing iron-based metal such as a nail from the crushed object to be processed, which comprises, for example, a magnetic separator.
[0023]
3 is a container for storing the removed metal, 4 is a first closed conveying means, and the closed conveying means 4 is also called a pipe conveyor, as shown in FIG. The flexible conveying means 6 is provided in the endless pipeline 5 and circulates and moves in the endless pipeline 5.
[0024]
The endless pipe line 5 includes a lower horizontal pipe part 5a that forms an outgoing pipe G, a standing (vertical or inclined) pipe part 5b, an upper horizontal pipe part 5c, and an upper horizontal pipe part 5d that forms a return pipe R, and a standing pipe. The forward pipe G and the return pipe R are connected endlessly by curved pipes 5g and 5h.
[0025]
As shown in FIG. 2, the flexible conveying means 6 is provided as an endless flexible conveying means in the endless pipe 5, and a workpiece receiving body (hereinafter referred to as a blade) 6 a and a multi-indirect body. And a flexible traction body (hereinafter abbreviated as a chain) 6b such as a chain or a rope, and a drive source 7 that pulls and drives the chain 6b, and circulates the traction body in one direction. The drive source 7 includes a motor 7a and a sprocket 7b that is driven by engaging with a pulling body. The sprocket 7b meshes with the chain 6b of the flexible conveying means 6 in the curved tube 5h, and the flexible conveying means. 6 is driven. This meshing portion is sealed with a cover 7c.
[0026]
Reference numeral 8 denotes an input port for the object to be processed provided in the lower horizontal pipe 5a of the outgoing line, and reference numeral 9 denotes an outlet for the object to be processed provided in the upper horizontal pipe part 5d of the return pipe R.
[0027]
Reference numeral 10 denotes a hopper, which stores an object to be processed from the first closed conveying means 4 and supplies it to the first fixed supply means 12 via the second closed conveying means 11. The second closing and conveying means 11 has the same configuration as the first closing and conveying means 4. A treatment agent 14 as a dechlorinating agent is injected into an appropriate portion of the second closed conveying means 11, for example, the lower horizontal pipe 5a. In addition, let the connection with the apparatus (metal removal means 2, hopper 10, fixed quantity supply means 12) connected to the supply port and discharge port of the closed conveyance means 4 and 11 be a sealed connection.
[0028]
The quantitative supply means 12 also has open / close valves on the top and bottom, and is operated so that both open / close valves do not open at the same time, thereby preventing the circulation of outside air.
[0029]
15 is a heat treatment furnace (hereinafter abbreviated as “demineralization furnace”) for drying and dechlorinating the object to be treated. The demineralization furnace 15 heats the object to be treated and the treatment agent by an external heating means, A dechlorination process is performed by reacting a decomposition gas that decomposes and precipitates from the object to be processed with heating and a treatment agent. If the rotary kiln type is taken as an example, a gas duct 15b is formed on the outer periphery of the rotary cylinder 15a. Hot gas is introduced to heat the object in the rotating cylinder 15a. Although not shown, the rotating cylinder 15a is rotatably supported by a support roller, is rotated by a rotation driving means, has a feed blade inside, and is rotated by the rotation of the rotating cylinder 15a. The object to be processed is transferred from the supply port side to the discharge port side with stirring.
[0030]
Reference numeral 16 denotes a supply-side duct that supplies a mixture of an object to be processed and a processing agent quantified by the quantitative supply means 12 into the rotating cylindrical body 15a. Reference numeral 17 denotes induction heating means, which has a heating coil, which is provided on the outer periphery of the rotating cylindrical body 15a on both ends of the heating jacket 15b, in a non-contact manner with the rotating cylindrical body 15a. The temperature decrease at both ends is supplementarily heated.
[0031]
Reference numeral 18 denotes a heat treatment furnace (hereinafter referred to as a carbonization furnace) for carbonizing an object to be dechlorinated in the desalination furnace 15, which has the same configuration as the heat treatment furnace of the desalination furnace 15. That is, it comprises a rotating cylinder 18a and a gas duct 18b as an external heating means provided on the outer periphery of the rotating cylinder 18a. Reference numeral 19 denotes induction heating means provided on both sides of the gas duct 18b on the outer periphery of the rotating cylindrical body 18a.
[0032]
Reference numeral 20 denotes a lead-in / out duct for an object to be processed, which introduces the object to be processed that has been heat-treated in the desalination furnace 15 into the carbonization furnace 18. Reference numeral 21 denotes a discharge duct, which introduces the carbide carbonized in the carbonization furnace 18 into the quantitative supply means 22.
[0033]
In addition, the mechanical seal C is given to each rotation contact part of the rotating cylindrical bodies 15a and 18a and the gas ducts 15b and 18b, and the leakage of a hot gas is prevented. Similarly, the mechanical seal C is applied to the rotating contact portion between the rotating cylindrical body 15a and the supply side duct 16 and the outlet / inlet duct 20, and the rotating contact portion between the rotating cylinder 18a and the outlet / inlet duct 20 and the discharge side duct 21, respectively. Gas leakage from the inside of the rotating cylinder is prevented.
[0034]
Reference numeral 23 denotes a hot air furnace, in which a fuel such as LNG, LPG, or petroleum is burned with a burner or the like to generate hot gas, which is supplied into the gas duct 18b of the carbonization furnace 18 and heated. and introduced into gas duct 15b desalting furnace 15 through, after heating the desalted furnace 15, the heat exchanger 26 via the gas pipe L _1, also introduces a part of the hot air furnace 23. Reference numeral 27 denotes a circulation blower for circulating the hot gas.
[0035]
Reference numeral 28 denotes a third closed conveying means having the same configuration as the first closed conveying means 4. The carbide quantified by the second quantitative supply means 22 is decomposed into the cracked gas combustion furnace via the third quantitative supply means 29. 30. The cracked gas combustion furnace 30 combusts fuel such as LNG, LPG or petroleum, and also decomposes gas (dry distillation gas) generated during the heat treatment in the desalination furnace 15 and the carbonization furnace 18 in addition to the carbonized carbide. It is introduced through the cracked gas conduits L ₂ and L ₃ and burned. The exhaust gas after combustion is collected by the cyclone 31 via the gas pipe L ₄ , then introduced into the heat exchanger 26 to recover heat, cleaned by the bag filter 32, and discharged through the silencer 33. An exhaust blower 34 sucks and discharges these gases.
[0036]
The heat exchanger 26 is divided into two gas chambers, one of which introduces the hot gas from the hot stove 23 and the hot gas after heating each heat treatment furnace through the gas pipe L ₁ and discharges it as it is, Since the combustion gas generated from the dry distillation gas combustion furnace 30 is mixed with various substances, the combustion gas is exhausted after being cleaned by the bag filter 32 through the other gas chamber.
[0037]
Reference numeral 35 denotes hot water utilization equipment, and water is circulated in the heat exchanger 26 by a pump 36 to obtain hot water.
[0038]
In addition, the connection of each apparatus which forms the channel | path of the to-be-processed object from the metal removal means 2 to the cracked gas combustion furnace 30 is made into a sealed connection, airtightness is maintained also as the whole channel | path, while maintaining a low oxygen region, and a bad odor Is formed so as not to leak to the outside.
[0039]
If the workpiece is not necessarily carbonized, it may be connected from the lead-in / out duct 20 to the third closed conveying means 28 via a fixed supply means (not shown).
[0040]
Reference numeral 37 denotes an ash recovery means. When the amount of ash generated by combustion in the cracked gas combustion furnace 30 reaches a predetermined amount, the door a is opened and taken out.
[0041]
The cracked gas conduits L ₂ and L ₃ are each composed of a double pipe. That is, as shown in FIG. 1 (B) in the cross-sectional view taken along the line XX, concentrically with cracked gas conduits L ₂ and L ₃ for conducting cracked gas (dry distillation gas) and a predetermined gap g on the outer periphery thereof. The insulated pipes P ₂ and P ₃ are arranged, and a hot gas is sent to the gap g to heat and maintain the cracked gas conduit.
[0042]
In this example, the hot gas to be introduced is from one end side (the cracked gas combustion furnace 30 side) of the heat retaining pipes P ₂ and P ₃ by the blower 38 from the gas pipe L ₄ that sends the exhaust gas from the cracked gas combustion furnace 30 to the cyclone 31. The gas is fed into the gap g, led out from the other end side (the lead-in / in duct 20 side) through the gas pipe L ₅ , and sent to the cyclone 31.
[0043]
At this time, fresh air 39 is introduced to keep the temperature at a temperature at which the tar content does not solidify, that is, a temperature equal to or higher than the temperature of the cracked gas generated from the object to be processed.
[0044]
Reference numerals 40, 50, 60 and 70 denote adhering substance removing means, which are respectively provided at the upper part and the lower part of the supply side duct 16 of the desalination furnace 15, the discharge side duct 21 of the carbonization furnace 18, and the lead-in / out duct 20. Is provided. The deposit removing means 60 and 70 provided in the lead-in / out duct 20 are for introducing air into the cracked gas conduits L ₂ and L ₃ , and may be provided in the cracked gas conduit itself.
[0045]
FIG. 3 shows one embodiment of these deposit removing means, and they all have the same configuration. The deposit removing means 40 will be explained. 41 is an opening / closing port provided in the supply side duct 16, and 42 is an opening / closing port. 41 is a cylindrical seat projecting outside the supply duct 16, 43 is a packing provided at the outer end of the cylindrical seat 42, 44 is in contact with the packing 43 to close and open the opening / closing port 41. The lower part of the opening / closing door is pivotally supported by the support shaft 45.
[0046]
46 is a door operation part for opening and closing the open / close door 44, a piston 46b to which a cylinder 46a, an operation rod 46c are attached, an accumulator spring 46d elastically mounted on the operation rod 46c, a pressure control switching valve 46e in the cylinder 46a, It consists of a bypass pipe 46f, and one end of the cylinder 46a is rotatably attached to the fixing member 46g, and the tip of the operation rod 46c is rotatably attached to the open / close door 44.
[0047]
Reference numeral 47 denotes a lock portion of the open / close door 44, which includes an electromagnet 47a and a lock pin 47b operated by the electromagnet 47a. The lock pin 47b rises when the electromagnet 47a is energized and descends when the electromagnet 47a is deenergized. When lowered, the door 44 is inserted into the fitting hole 44b of the engaging portion 44a provided in the upper portion of the opening / closing door 44 and the fitting hole 42b of the engaging portion 42a provided in the cylindrical body seat 42 to lock the door 44.
[0048]
Therefore, when closing the opening / closing door 44, the switching valve 46e is switched to the compressor side, air is sent into the cylinder 46a from the compressor (not shown), and the opening / closing door 44 is turned counterclockwise by the operating rod 46c via the piston 46b. Rotate to close. In the closed state, the electromagnet 47a is de-energized and the lock pin 47b is lowered to lock the door.
[0049]
At this time, the energy storage spring 46d is stored by the movement of the piston 46b, and therefore maintains the stored state. After locking the opening / closing door 44, the switching valve 46e is switched to the exhaust side, and the inside of the cylinder 46a is kept at atmospheric pressure.
[0050]
The opening operation of the open / close door 44 energizes the electromagnet 47a to raise the lock pin 47b and disengage the engagement portion 44a. When the lock is released, the open / close door 44 is rapidly rotated clockwise by the release of the energy storage spring 46d. At this time, the air in the piston 46b is released to the opposite side of the cylinder 46a by the bypass pipe 46f, and assists the movement of the cylinder 46a.
[0051]
Next, a series of heat treatment methods for an object to be processed will be described.
[0052]
Each device / device is driven from the start of operation, but the exhaust gas system is sequentially activated from the downstream side of the gas flow path. First, the exhaust blower 34 is activated and the pressure in the gas flow path from each furnace to the exhaust blower, in particular, the pressure in each furnace, the pressure in the cracked gas combustion furnace, and the like are monitored, and a predetermined reduced pressure state (for example, − When reaching 4000 to 13300 Pa), the door 44 of the deposit removing means 60 and / or 70 is opened. A large amount of air is introduced at a high speed by opening the door, and the cracked gas conduits L ₂ and L ₃ -the cracked gas combustion furnace 30 -the gas pipe L ₄ -the cyclone 31 -the heat exchanger 26 -the bag filter 32 -the exhaust blower 34 -Exhausted through the silencer 33; Deposits adhered in the cracked gas conduits L ₂ and L ₃ are removed by this air flow, and are passed through the introduced air and collected by the cyclone 31 or the bag filter 32. This operation is repeated 3 to 5 times.
[0053]
Further, if the doors of the deposit removing means 40 and 50 are opened, the deposits attached to the furnace walls of the heat treatment furnaces 15 and 18 can be removed.
[0054]
After the opening / closing door 44 of the deposit removing means is opened for a predetermined time (for example, about 5 minutes), the opening / closing door 44 is closed, the opening / closing port 41 is closed, and the operation is continued. It is desirable to perform this operation every time operation is started. Of course, the operation frequency is appropriately selected depending on the quality of the object to be processed.
[0055]
Next, a fuel such as LNG is burned in the hot air furnace 23 to generate a hot gas, and the circulating blower 27 is operated to introduce the hot gas into the gas duct 18b of the carbonization furnace 18 and the gas duct 15b of the desalination furnace 15, The rotating cylinders 18a and 15a are heated.
[0056]
Assuming that the heating temperature for dechlorination is 250 ° C. to 350 ° C. and the heating temperature for carbonization is 450 ° C. to 650 ° C., first, the carbonization furnace 18 is heated to 450 ° C. to 650 ° C. Gas is introduced into the desalination furnace 15 from the communication pipe 24. At this time, the temperature adjusting air 25 is introduced into the communication pipe 24 to adjust the temperature of the desalting furnace 15 to 250 ° C. to 350 ° C.
[0057]
Next, the object to be processed is put into the crushing means 1 and crushed into a predetermined size (30 mm or less). Then, the metal removing means 2 excludes ferrous metals such as nails, and the first closed conveying means 4 conveys the hopper 10 to temporarily store it.
[0058]
Next, it is introduced from the lower part of the hopper 10 into the first fixed supply means 12 through the second closed conveying means 11 and weighed here, and a predetermined amount (quantification of the input amount) is supplied to the desalination furnace 15. Supply. At this time, a treatment agent 14 for dechlorination is injected into the second closed conveying means 11. The object to be processed, the object to be processed, and the processing agent are agitated and mixed in the transport process by the second closed conveying means 11.
[0059]
The heat treatment in the desalination furnace 15 is performed according to the temperature and time at which a harmful substance (hydrogen chloride or the like) contained in the workpiece is deposited. This temperature and time are investigated in advance to grasp the properties of the object to be processed, and processed at a temperature (200 ° C. to 350 ° C., about 30 minutes) and time that can sufficiently cover the result of the investigation.
[0060]
The heat treatment in the desalination furnace 15 and the carbonization furnace 18 is not combustion or incineration but steaming and pyrolysis in a low-oxygen atmosphere, and halogen-based substances (HCl gas deposited by thermal decomposition). Etc.) and contact treatment with harmful substances.
[0061]
As the treating agent to be mixed or added with the object to be treated, an alkaline substance that generates a harmless chloride by reacting at least with HCl (hydrogen chloride) is used. For example, JP-A-9-155326, JP-A-10-43713, JP-A-10-235186, JP-A-10-235187, JP-A-11-9937, and JP-A-11-11 filed earlier by the applicant of the present application. As shown in 101417, alkaline earth metal, alkaline earth metal compound, alkali metal, alkali metal compound, specifically, calcium, lime, slaked lime, calcium carbonate, dolomite, silicate (calcium silicate, etc.), One type is selected from sodium hydrogen carbonate, sodium carbonate, sodium sesquicarbonate, natural soda, sodium hydroxide, potassium hydroxide, potassium hydrogen carbonate, potassium carbonate, or a mixture of several types is used. As a usage-amount, 5 to 30 weight% is mixed or added with respect to a to-be-processed object.
[0062]
Alternatively, a porous alkali substance (porous dechlorinating agent) shown in Japanese Patent Application No. 10-193844 filed earlier by the client of the present application is used. Porous, the vaporized component (O, H, CO, CO 2 , etc.) vaporized component containing by heating an alkaline substance containing H ₂ O, flashed off as CO _2, an alkaline substance member by the separating splashing It is made porous by forming through holes and recesses (holes). The surface area due to the porous structure increases, and the contact area with the generated gas increases. This porous dechlorinating agent is used by mixing or adding 5 to 30% by weight to the object to be treated.
[0063]
For example, when sodium hydrogen carbonate (NaHCO ₃ ) is used, the decomposition gas of the HCl component is generated in the detoxification treatment furnace 5, but it immediately reacts with sodium hydrogen carbonate (NaHCO ₃ ) + (HCl) → ( NaCI) + (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 treated after the heat treatment are simultaneously performed.
[0064]
The detoxified workpiece is sent to the rotating cylindrical body 18a of the carbonization furnace 18 through the lead-in / in duct 20, where the carbonization of the workpiece (carbonization starts at about 350 ° C.). ) Carbonized at 350 ° C. to 700 ° C., preferably 600 ° C.
[0065]
The carbonized workpiece (carbide) is introduced into the cracked gas combustion furnace 30 through the second fixed supply means 22, the third closed conveying means 28, and the third fixed supply means 29 and burned. On the other hand, the cracked gas (dry distillation gas) generated in the desalination furnace 15 and the carbonization furnace 18 is also introduced into the cracked gas combustion furnace 30 and is combusted together (800 ° C., 2 seconds or more), and the carbide is ashed. . The exhaust gas generated by this combustion process is discharged into the atmosphere via the cyclone 31, the heat exchanger 26, the bag filter 32, and the silencer 33.
[0066]
In addition, the cracked gas conduits L ₂ and L ₃ are surrounded by the heat insulation pipes P ₂ and P ₃ , respectively, and hot gas for maintaining at least a temperature at which tar content does not solidify is blown into the heat insulation pipes. The phenomenon that tar and the like adhere and solidify in the cracked gas conduit is eliminated.
[0067]
【The invention's effect】
The present invention has the following effects.
(1) Since a large amount of air can be ventilated at high speed by opening a part of the sealed path using the reduced pressure environment at the beginning of operation, various deposits adhering to the pipe line and furnace wall are removed. Can be recovered.
(2) Therefore, problems such as blockage and combustion due to the growth of deposits are solved, and stable thermal decomposition treatment can be performed.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a thermal decomposition treatment facility of the present invention.
FIG. 2 is an explanatory diagram of a closing conveyance unit.
FIG. 3 is an explanatory diagram of a deposit removing means.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Crushing means 2 ... Metal removal means 3 ... Container 4, 11, 28 ... Closed conveyance means 5 ... Endless pipe 6 ... Flexible conveyance means 7 ... Drive source 8 ... Input port 9 ... Discharge port 10 ... Hopper 12, 22, 29 ... fixed quantity supply means 14 ... treatment agent 15 ... desalination furnace 16 ... supply side ducts 17 and 19 ... induction heating means 18 ... carbonization furnace 20 ... lead-in / out duct 21 ... discharge side duct 23 ... hot air furnace 24 ... communication pipe 25 ... Temperature control air 26 ... Heat exchanger 27 ... Circulating blower 30 ... Decomposed gas combustion furnace 31 ... Cyclone 32 ... Bag filter 33 ... Silencer 34 ... Exhaust blower 35 ... Hot water utilization equipment 36 ... Pump 37 ... Ashing substance recovery means 38 ... Blowers 40, 50, 60, 70 ... Deposit removal means L ₂ , L ₃ ... cracked gas conduit

Claims (6)

Conveying means for conveying the object to be processed, thermal decomposition processing means for reducing the volume of the object to be processed by external indirect heating, residue processing means for recovering the generated residue, and cracked gas combustion means for burning the generated decomposition gas A cracked gas conduit means for guiding the cracked gas generated in the pyrolysis treatment means to the cracked gas combustion means, an exhaust blower means for exhausting the exhaust gas burned in the cracked gas combustion means, and an object to be treated in the pyrolysis treatment means A deposit removing means having an open / close door in the flow path and / or the cracked gas conduit means;
The exhaust blower means is activated to suck and depressurize the gas flow path between the thermal decomposition treatment means and the exhaust blower means for a certain period of time, and after a predetermined pressure reduction, open and close the opening / closing door of the deposit removing means. A thermal decomposition treatment facility characterized in that at least deposits in the cracked gas conduit are removed by rapidly introducing air into the cracked gas conduit means .   The thermal decomposition treatment facility according to claim 1, wherein the deposit removing means is provided on the input side and / or the discharge side of the workpiece of the heat treatment furnace in the thermal decomposition processing means.   The cracked gas conduit means comprises a cracked gas conduit and a heat insulating pipe surrounding the cracked gas conduit, and a hot gas having a temperature equal to or higher than the temperature of the cracked gas generated by the thermal decomposition treatment means is introduced into the heat insulating pipe. The thermal decomposition treatment facility according to claim 1 or 2.   4. The thermal decomposition treatment facility according to claim 3, wherein the hot gas introduced into the heat insulation pipe is the hot gas obtained by the decomposition gas combustion means.   Conveying means for conveying the object to be processed, thermal decomposition processing means for reducing the volume of the object to be processed by external indirect heating, residue processing means for recovering the generated residue, and cracked gas combustion means for burning the generated decomposition gas A cracked gas conduit means for guiding the cracked gas generated in the pyrolysis treatment means to the cracked gas combustion means, an exhaust blower means for exhausting the exhaust gas burned in the cracked gas combustion means, and an object to be treated in the pyrolysis treatment means The flow path and / or the cracked gas conduit means is provided with a deposit removing means having an open / close door, and the exhaust blower means is activated to suck the gas flow path between the thermal decomposition treatment means and the exhaust blower means for a certain period of time. The pressure is reduced, and after a predetermined pressure reduction, the door of the deposit removing means is opened and air is rapidly introduced into at least the cracked gas conduit means so that at least deposits in the cracked gas conduit are removed. The method of operating the thermal decomposition treatment plant, characterized in that the.   6. The method for operating a thermal decomposition treatment facility according to claim 5, wherein the opening / closing door of the deposit removing means is opened at the start of operation.

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