JP2004162972A - Recycling apparatus and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective operation method in a recycling furnace or a multifuel combustion furnace. <P>SOLUTION: A recycling apparatus EQU comprises the recycling furnace 1 for achieving carbonization treatment or dry distillation treatment; and the multifuel combustion furnace 2 for supplying a secondary fuel as needed and burns a flammable gas being generated by the recycling furnace. The recycling apparatus EQU also comprises a means for adjusting the amount of supply of the secondary fuel, based on an outlet temperature in the multifuel combustion furnace 2; and a means for permitting the throwing of waste into the recycling furnace 1 when the amount of supply of the secondary fuel goes below a reference value SD by a specific amount of time and then goes above the reference value DS again. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a combustion control method for effectively operating a recycling furnace to effectively use energy.
[0002]
[Prior art]
As a method for treating industrial waste, various methods for generating a combustible gas and a carbide by thermally decomposing a collected plastic product are known (for example, see Non-Patent Document 1, and Patent Documents 1 and 2). Note that, in this specification, regardless of the description in other documents, pyrolysis of an object in a state where there is no excess oxygen is referred to as carbonization processing, and a furnace that realizes the carbonization processing is referred to as a carbonization furnace. In accordance with this usage, supplying a certain amount of excess oxygen to thermally decompose the object is called dry distillation, and a furnace for realizing the dry distillation is called a dry distillation furnace.
[0003]
Then, a pyrolysis gas is generated from the carbonization furnace, and a carbide is generated when the carbonization process is completed. On the other hand, a carbonization gas is generated from the carbonization furnace, and an ash is generated when the carbonization process is completed. Further, in this specification, the recycling furnace includes at least a carbonization furnace and a carbonization furnace, and the combustible gas includes at least a pyrolysis gas and a carbonization gas.
[0004]
[Non-patent document 1]
JPO homepage • List of patent map creation themes by technical field (94 themes) • Machinery 6 Incinerator technology • 1.3.3 Dry distillation gasification combustion technology • http: // www. jpo. go. jp / indexj. htm
[Patent Document 1]
JP 2001-182935 A [Patent Document 2]
JP-A-2001-241632
[Problems to be solved by the invention]
By the way, such a conventional combustion method has a problem when, for example, a plastic material generated daily in a manufacturing plant or a processing plant is processed in a recycling furnace installed in the same facility.
[0006]
In other words, if the waste from the previous day is to be treated at once, the amount of heat generated in the co-firing furnace that mixes the combustible gas with the secondary fuel and complete combustion is too large, and the same It cannot be easily processed in the limited space in the facility. In addition, the operation time of the co-firing furnace is limited, and even if a boiler is installed downstream of the co-firing furnace, the time zone in which steam can be generated is limited, so that the usability is extremely poor. .
[0007]
Therefore, it is conceivable that the waste from the previous day is appropriately divided and disposed of. However, when such intermittent charging operation is performed, it is extremely difficult to charge the plastic material to the recycling furnace, and the timing is incorrect. In addition, the carbonization treatment and the carbonization treatment in the recycling furnace become incomplete or the operation time becomes long.
[0008]
Further, it is not easy to determine the timing of ending the operation regardless of whether the waste is treated in the same facility such as a manufacturing plant or whether the recycling furnace is operated intermittently. If wrong, not only unprocessed waste remains in the recycling furnace, but also there is a risk that the molten waste is fixed in the furnace.
[0009]
The present invention has been made in view of the above problems, and provides an effective operation method in a recycling furnace or a co-firing furnace, and also provides a recycling apparatus that realizes an effective combustion method. That is the task.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is directed to a recycling furnace for realizing a carbonization process or a dry distillation process, and supplying a secondary fuel as necessary, while supplying the combustible gas generated in the recycling furnace. In a recycling apparatus provided with a co-firing furnace for burning, an adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, and the supply amount of the secondary fuel has fallen below a reference value for a predetermined time. After that, when the value exceeds the reference value again, there is provided a permitting means for permitting the introduction of the waste into the recycling furnace. The permission means may permit the input of the waste into the recycling furnace when the supply amount of the secondary fuel falls below the reference value and then exceeds the reference value again. This applies to the third aspect of the present invention.
[0011]
Further, the invention according to claim 2 comprises a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning the combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. In the provided recycling device, an adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, and when a predetermined time has elapsed while the supply amount of the secondary fuel exceeds a reference value, Permission means for permitting input of waste into the recycling furnace. In addition, it is preferable to further provide a heat exchanger for receiving the combustion exhaust gas discharged from the co-firing furnace, including the case of the invention according to claims 3 to 11, and examples of the heat exchanger include an exhaust gas boiler and a water heater. Typical.
[0012]
The invention according to claims 3 and 4 is an operating method realized by the recycling apparatus according to claims 1 and 2. In these inventions, it is effective that the predetermined time is determined for each waste put into the recycling furnace. In addition, when adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, the combustion air may be adjusted together, but the residence time at 800 ° C. or more for 2 seconds or more is maintained. In order to achieve this, it is preferable to maintain the amount of combustion air at a constant value and adjust only the secondary fuel.
[0013]
The invention according to claim 5 is provided with a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning a combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. In the recycling device, adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, after the supply amount of the secondary fuel falls below a reference value for a predetermined time, again exceeds the reference value, Further, there is provided a termination means for permitting termination of the operation of the co-firing furnace when a preset time has elapsed.
[0014]
Further, the invention according to claim 6 includes a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning a combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. In the recycling apparatus provided, an adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, a predetermined time elapses while the supply amount of the secondary fuel exceeds a reference value, and Terminating means for permitting termination of the operation of the co-firing furnace when a set time has elapsed.
[0015]
The invention according to claims 7 and 8 is an operation method realized by the recycling apparatus according to claims 5 and 6. In the invention according to each of the above claims, the processing capacity of the recycling furnace is determined according to the type of waste to be charged and the amount of heat required for the heat exchanger that receives the combustion exhaust gas discharged from the co-firing furnace. Is preferred. Further, it is preferable that the waste is repeatedly and intermittently charged into the recycling furnace.
[0016]
The invention according to each of the above-mentioned claims treats waste and generates combustible gas and carbide (possibly ashed). The waste is typically a plastic material, and preferably contains chlorine. It is a plastic material that does not contain. Each of the above-mentioned inventions is suitably applied to the treatment of specific wastes that are constantly discharged from the same facility such as a manufacturing plant or a processing plant, but almost accurately regardless of whether or not the waste is discharged from the same facility. It is suitable to be applied to the treatment of waste separated into waste. In this case, the wastes should be separated into the same kind, but the commonality of the composition does not matter.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples. FIG. 1 is a schematic diagram illustrating a recycling apparatus EQU that realizes the combustion control method according to the embodiment. The recycling apparatus EQU generates a steam from a recycle furnace 1 functioning as a carbonization furnace or a carbonization furnace, a co-burning furnace 2 for burning combustible gas generated in the recycle furnace 1, and a combustion exhaust gas discharged from the co-burning furnace 2. An exhaust gas boiler 3, an economizer 4 for preheating the water supply to the exhaust gas boiler 3, and a storage unit 10 for storing waste and dropping a predetermined amount of waste into the recycling furnace 1 based on a command from the control unit CTL. And the center is provided.
[0018]
Here, the recycling furnace 1 is integrated with the storage unit 10 disposed thereon, and the co-firing furnace 2, the exhaust gas boiler 3 and the economizer 4 disposed thereon are also integrated, thereby saving space. Has been realized.
[0019]
In this embodiment, the recycling furnace 1 is formed in a substantially cylindrical shape, and is divided into upper and lower parts via a disk-shaped grate 5. A combustion chamber 1a formed of a refractory material in a substantially rectangular shape is provided below the grate 5, and a reaction chamber 1b for containing a plastic material to be treated is provided above the grate 5. ing. A large number of openings are formed substantially uniformly in the disk-shaped grate 5 so that the upper and lower sides of the recycling furnace 1 communicate with each other.
[0020]
The combustion chamber 1a is formed at a height of about 80 cm from the viewpoint of maintainability. An introduction portion 6 for gas fuel and combustion air is provided on one side in the horizontal direction, and an inspection door 7 is provided on the other side. Is provided. In the case of this embodiment, a diffusion gas burner is disposed in the introduction section 6, and combustion air is supplied by the blower 8, and gas fuel (for example, city gas 13A) is supplied through the control valve V1. ing.
[0021]
On the other hand, the reaction chamber 1b is provided with an outlet 11 for combustible gas generated from the reaction chamber 1b and an outlet 12 for collecting carbides and metal components remaining on the grate 5. In addition, at an appropriate timing, the opening / closing shutter SHUT of the storage unit 10 is opened and the plastic material as the processing target is put into the reaction chamber 1b.
[0022]
FIG. 2A is a schematic view when the direction of the introduction unit 6 is viewed from the inspection door 7. As shown in the figure, a discharge port 13 for gaseous fuel is disposed substantially at the center of the combustion chamber 1a. The bottom of the combustion chamber 1a has an inclined surface that is inclined downward toward the center and extends in the discharge direction of the gaseous fuel, and is formed in an inverted trapezoidal shape in a sectional view. Therefore, the plastic material P that has liquefied and dripped from the grate 5 is collected at the center of the bottom, and the radiant heat from the flame portion F is effectively transmitted.
[0023]
A large number of small-diameter openings are formed in the grate 5, and the discharge pressure of the diffusion-type gas burner is set to be sufficiently high. For this reason, the hot air that is vigorously blown out from the many openings spreads uniformly throughout the reaction chamber 1b, and effectively promotes the thermal decomposition of the plastic material. That is, in the case of this embodiment, although the pressure loss is generated by the small diameter of the opening of the grate 5, the rectifying action is exerted on the hot air introduced into the reaction chamber 1b. When the opening of the grate 5 is large, the pressure loss is reduced, but it is inappropriate because all the hot air may flow in a specific flow path formed by a local high-temperature portion of the flame.
[0024]
As shown in FIG. 1, the co-firing furnace 2 includes a diffusion-type gas burner 14 on one side of a combustion space. The configuration of the diffusion type gas burner is not particularly limited. For example, as shown in FIG. 3, the combustible gas from the recycling furnace 1 is introduced into the inner tube 15 a of the double tube 15, while the outer tube 15 b of the double tube is Gas fuel as secondary fuel is introduced. These fuels are discharged toward the enlarged diameter portion 16 extending from the outer tube 15b, and are mixed with combustion air introduced from the side surface of the enlarged diameter portion 16 to burn. Note that combustion air is supplied to a side surface of the enlarged diameter portion 16 by a blower 17.
[0025]
When the recycle furnace 1 functions as a carbonization furnace, the pyrolysis gas output from the recycle furnace 1 and the gas fuel supplied to the outer tube 15b are burned in a mixed state. Specifically, the control valve V2 is controlled based on the output of the temperature sensor TE arranged at the output part of the co-firing furnace 2, and the temperature of the combustion exhaust gas is controlled at 800 ° C or higher. The volume of the co-firing furnace 2 and the supply amount of combustion air are set so that the residence time of the combustion gas (combustion flame and combustion completion gas) is 2 seconds or more.
[0026]
The exhaust gas boiler 3 is connected to the upper part of the co-firing furnace 2 and is integrally held. Although the configuration of the exhaust gas boiler 3 is not particularly limited, in this embodiment, a once-through boiler as shown in FIG. 5 is used. This once-through boiler has a configuration in which a number of vertical water pipes 18... 18 are connected between an upper header 17A and a lower header 17B, and water is supplied to the lower header 17B while the vertical water pipe 18 is raised. Then, the mixture is brought into a gas-water mixed state, and sent to the steam-water separator 19 from the upper header 17A to be separated to obtain steam.
[0027]
As shown in FIG. 5B, the vertical water pipe 18 has a double structure of an inner water pipe group 18A and an outer water pipe group 18B arranged in an annular shape. Then, the combustion exhaust gas introduced from the exhaust gas outlet of the co-firing furnace 2 flows through the gap between the inner and outer water pipe groups 18A and 18B from the gas inlet 20 formed on one side of the inner water pipe group 18A, and the other of the outer water pipe group 18B. It is led out from a gas outlet 21 formed on the side. After the flue gas discharged from the gas outlet 21 undergoes further heat exchange in the economizer 4, the flue gas is led out to the chimney 23 by the induction fan 22 and released to the atmosphere.
[0028]
Next, the operation of the co-firing furnace 2 in the recycling apparatus EQU having the above configuration will be described. FIG. 6 is a time chart showing a temporal transition of the supply amount of the gas fuel supplied to the co-firing furnace 2. Immediately after the start of the operation, no pyrolysis gas is generated from the recycle furnace 1, so the maximum gas fuel is supplied to obtain a predetermined amount of heat. Thereafter, as the pyrolysis gas is generated, the gaseous fuel is supplied. Supply is declining.
[0029]
Here, the combustion operation in the co-firing furnace 2 differs depending on the type of waste (preferably, plastic material) charged into the recycling furnace 1, and as shown in FIGS. It is divided roughly into two according to the size of the cracked gas. However, in any case, when the carbonization process in the recycling furnace 1 is completed, the operation is intermittent, in which waste is again input from the storage unit 10 into the reaction chamber 1b and the carbonization process is repeated.
[0030]
As described above, since the recycling apparatus EQU of the embodiment is operated intermittently, it is possible to limit the amount of generated heat as compared with the case where the wastes are processed in one day, and to achieve the maximum combustion of the co-firing furnace 2. There is an advantage that the furnace volume design and heat-resistant design can be simplified depending on the amount. FIG. 4 illustrates this relationship. When the wastes for one day are collectively carbonized, the peak value of the generated heat is high, so that a sufficient furnace volume and heat-resistant structure are required. Is shown. In addition, if the waste for one day is treated collectively, the combustion time is short, so the method of using the generated heat is restricted or imposed. However, in the case of intermittent operation, the generated heat is stable for a long time. It is also highly available.
[0031]
The combustion operation in the co-firing furnace 2 is roughly divided into two in accordance with the output mode of the pyrolysis gas output from the recycling furnace 1 (combustion operation 1, combustion operation 2). However, in any case, the control unit CTL only controls the control valve V2 based on the output of the temperature sensor TE to adjust the supply amount of the gas fuel, and the air amount for combustion is always a constant value. is there. In this case, it goes without saying that the amount of gas fuel supplied and the amount of air for combustion may be adjusted.
[0032]
The combustion operation 1 shown in FIG. 6A is a general combustion operation in which the total calorific value of the pyrolysis gas generated from the waste is relatively large. As shown in the figure, after a predetermined time TIME2 elapses after the supply amount of the gaseous fuel falls below the reference value SD, when the supply amount of the gaseous fuel exceeds the reference value SD, the opening permission signal of the opening / closing shutter SHUT is sent from the control unit CTL. Is output. Then, when the open / close shutter SHUT is opened, waste is put into the reaction chamber 1b, and thermal decomposition gas starts to be generated again by thermal decomposition.
[0033]
As a result, the supply of gaseous fuel is reduced, and thereafter, when the carbonization of the waste is completed, the waste is re-input. If such processing is repeated, the final carbonization processing of the waste is eventually completed, so that the operation is stopped after a predetermined time elapses after the intermittent charging permission condition is satisfied. As a result, the operation of the recycling apparatus EQU is terminated after the pyrolysis gas is completely eliminated, and no adverse effect such as the liquefied pyrolysis gas blocking the piping is caused.
[0034]
On the other hand, as shown in FIG. 6 (b), in the case of waste having a small total calorific value of the generated pyrolysis gas, the supply amount of the gas fuel may not fall below the reference value SD no matter how long the operation is continued. is there. In such a case, the opening permission signal of the opening / closing shutter SHUT is output on condition that the supply of the gas fuel has been maintained for the predetermined time TIME1 without falling below the reference value SD. Note that the predetermined time TIME1 is determined according to the amount and type of waste to be charged, and is a time required for completely subjecting the waste to the recycling furnace 1 to thermal decomposition.
[0035]
After repeating such intermittent charging, if the final carbonization treatment of the waste is completed, the operation is stopped after a predetermined time elapses after the condition for permitting intermittent charging is satisfied.
[0036]
FIG. 7 is a flowchart illustrating a control method for realizing the above operation. When the driving operation is started, the first time measurement operation for updating the time variable T1 is started after clearing the time variable T1 (ST1). Next, by monitoring the supply amount Q of the secondary fuel (gas fuel) determined based on the output of the temperature sensor TE, it is determined whether the supply amount Q of the secondary fuel is larger than the reference value SD. (ST2). Here, if Q> SD, such as immediately after the start of operation, it is next determined whether or not the time variable T1 has exceeded the first reference time TIME1 (ST3).
[0037]
In the case of the combustion operation 1 as shown in FIG. 6A, the supply amount of the secondary fuel Q eventually decreases and Q ≦ SD, and in that case, the time variable T2 is cleared and then the time variable T2 Is started (ST7). Next, the process waits until the supply amount Q of the secondary fuel exceeds the reference value SD again (ST8). If the condition of Q> SD is satisfied, the step is performed under the condition that the time variable T2 exceeds the second reference time TIME2. The process proceeds to ST4. In the exceptional case where T2 ≦ TIME2, the process returns to step ST1.
[0038]
Normally, as a result of the determination in step ST9, T2> TIME2, so that after the time variable T3 is cleared, a third timing operation for updating the time variable T3 is started (ST4). Then, unless the processing of the finally input waste is completed, the next input of the waste is permitted and the process returns to the step ST1. As a result of repeating such processing, when the carbonization processing of the finally input waste is completed, the operation end is permitted on condition that the time variable T3 exceeds the third reference time TIME3 (ST10, ST11). .
[0039]
As described above, the control of the combustion operation 1 shown in FIG. 6A is realized by generally repeating the processing of ST1 to ST3 → ST7 to ST9 → ST4 to ST6. Therefore, the next waste is charged at the optimal timing when the thermal decomposition of the waste is completed, and the co-firing furnace 2 can be operated with high efficiency. In addition, since the operation is stopped after the process of step ST10, the remaining unburned pyrolysis gas is also prevented from remaining.
[0040]
By the way, if the processing of steps ST2 and ST3 is repeated, there may be a case where T1> TIME1 as shown in FIG. 6B. In such a case, after clearing the time variable T3, a third timing operation for updating the time variable T3 is started (ST4), and the processing of the next waste is completed except when the processing of the finally input waste is completed. The input is permitted, and the process returns to step ST1.
[0041]
As a result of repeating such processing, when the processing of the finally input waste is completed, the operation end is permitted on condition that the time variable T3 exceeds the third reference time TIME3 (ST10, ST11). As described above, the control of the combustion operation 2 shown in FIG. 6B is realized by generally repeating the processing of steps ST1 to ST6. Here, since the first reference time T1 is set to an optimal time required for pyrolyzing the input waste, it is possible to shift to the next thermal decomposition process at an optimal timing.
[0042]
Although the embodiments of the present invention have been specifically described above, the specific description does not particularly limit the present invention. For example, in the above description, for convenience, the recycling furnace is merely described as functioning as an ideal carbonizing furnace, and does not prohibit the recycling furnace from functioning as a carbonization furnace.
[0043]
Further, in the above description, the case where the combustion operation is continued even when the waste is re-input is exemplified. However, the combustion operation may be interrupted when the waste is re-input. In the process of step ST5, unlike the operation of the embodiment, the final operation is performed on the condition that the supply amount of the secondary fuel does not decrease even after a certain period of time has elapsed after outputting the opening permission signal of the opening / closing shutter SHUT. It may be determined that the process has been completed.
[0044]
【The invention's effect】
As described above, according to the present invention, an effective operation method in a recycling furnace or a co-firing furnace can be realized, and a recycling apparatus that realizes an effective combustion method can be realized.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating an overall configuration of a recycling apparatus according to an embodiment.
FIG. 2 is a schematic diagram illustrating a combustion chamber of the recycling furnace of FIG. 1;
FIG. 3 is a schematic diagram showing a configuration of a diffusion type gas burner.
FIG. 4 is a diagram illustrating a combustion operation in a co-firing furnace.
FIG. 5 is a schematic view showing an example of an exhaust gas boiler.
FIG. 6 is a diagram illustrating a combustion control method according to an embodiment.
FIG. 7 is a flowchart illustrating a combustion control method according to the embodiment.
[Explanation of symbols]
1 Recycling furnace 2 Co-firing furnace EQU Recycling equipment SD Standard value

Claims (8)

In a recycling apparatus provided with a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning the combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary,
Adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace; and when the supply amount of the secondary fuel falls below a reference value for a predetermined time and then exceeds the reference value again, the recycling A recycling unit comprising: a permission unit that permits a waste to be put into a furnace. In a recycling apparatus provided with a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning the combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary,
Adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace; and when a predetermined time elapses while the supply amount of the secondary fuel exceeds a reference value, waste to the recycling furnace is And a permitting means for permitting the introduction of waste. A method for operating a recycling apparatus comprising: a recycling furnace for realizing a carbonization treatment or a carbonization treatment; and a co-firing furnace for burning a combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. ,
Adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, and after the supply amount of the secondary fuel falls below a reference value for a predetermined time, and then exceeds the reference value again, to the recycling furnace. Method of operating a recycling device that allows the input of waste. A method for operating a recycling apparatus comprising: a recycling furnace for realizing a carbonization treatment or a carbonization treatment; and a co-firing furnace for burning a combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. ,
The supply amount of the secondary fuel is adjusted based on the exit temperature of the co-firing furnace, and when a predetermined time has elapsed while the supply amount of the secondary fuel has exceeded a reference value, the input of waste into the recycling furnace is performed. The operation method of the recycling device that allows the user. In a recycling apparatus provided with a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning the combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary,
Adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, and after the supply amount of the secondary fuel falls below a reference value for a predetermined time, exceeds the reference value again, and is set in advance. End means for permitting the end of the operation of the co-firing furnace when the elapsed time has elapsed. In a recycling apparatus provided with a recycling furnace for realizing a carbonization treatment or a carbonization treatment, and a co-firing furnace for burning the combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary,
Adjusting means for adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace; a predetermined time elapses while the supply amount of the secondary fuel exceeds a reference value; and a predetermined time elapses And a termination means for permitting termination of the operation of the co-firing furnace when the operation is completed. A method for operating a recycling apparatus comprising: a recycling furnace for realizing a carbonization treatment or a carbonization treatment; and a co-firing furnace for burning a combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. ,
Adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, and after the supply amount of the secondary fuel falls below a reference value for a predetermined time, exceeds the reference value again, and further sets a set time. An operation method of a recycling apparatus, wherein when the time has elapsed, the operation of the co-firing furnace is permitted to end. A method for operating a recycling apparatus comprising: a recycling furnace for realizing a carbonization treatment or a carbonization treatment; and a co-firing furnace for burning a combustible gas generated in the recycling furnace while supplying a secondary fuel as necessary. ,
Adjusting the supply amount of the secondary fuel based on the outlet temperature of the co-firing furnace, a predetermined time has elapsed while the supply amount of the secondary fuel has exceeded a reference value, and when a set time has elapsed, An operation method of a recycling apparatus configured to permit termination of operation of the co-firing furnace.

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