JP4404867B2 - Waste treatment equipment - Google Patents

Description

  The present invention relates to a technique for reducing the volume of organic waste and effectively using it as biomass energy.

In the earth's biosphere, there is a material cycle where microorganisms are decomposed and reduced to inorganic substances by the microorganisms, but instead of these microorganisms (decomposers), humans are trying to use them effectively for energy and organic raw materials. This is biomass conversion (utilization technology).
In recent years, the annual generation amount of biomass resources is estimated to be about 370 million tons, and the available amount is estimated to be about 77 million tons. However, most of the current treatment methods are disposed of or incinerated, and the above amount of biomass resources is converted to about 127 million tons of carbon dioxide. Therefore, it is desired to effectively use biomass resources without incineration for reducing the emitted carbon dioxide and for reducing the volume of waste.

  Conventionally, vacuum (reduced pressure) dryers have been used to reduce the volume of waste by drying (for example, Patent Document 1). However, with a conventional vacuum dryer, drying up to a moisture content of about 10% is the limit, and if it is attempted to reduce the moisture content more than that, fine dust that easily scatters is generated, which is removed from the treatment tank. It was mixed with exhaust and discharged. In addition, when the waste is vegetable waste with a high sugar content, there is a problem that stickiness is generated while the waste is dried, resulting in a dumpling state, and the drying efficiency is rapidly reduced.

Further, in recent years, a drying technique using superheated steam has been proposed (for example, Patent Document 2). Superheated steam is a colorless transparent material obtained by heating saturated steam evaporated at 100 ° C. to a higher temperature while maintaining normal pressure. H ₂ O gas. Since the superheated steam does not contain air, high-temperature heat can be brought into direct contact with the processed material, so that the processed material can be heated with high efficiency.

For example, in the technique described in Patent Document 2 (fifth and sixth embodiments), the inside of the heating dryer is substantially sealed, superheated steam is brought into direct contact with the material to be dried, and superheat after contact is made. It is set as the structure which distribute | circulates water vapor | steam. Further, a temperature raising means is provided in the superheated steam circulation path, and after removing a part of the superheated steam, a low-pressure steam turbine using the superheated steam as a drive source through a power generation heater and a power generation means connected thereto are provided. It is provided and superheated steam is configured to be used for drying an object to be dried and power generation.
JP 2005-257111 A JP 2005-241239 A

  In the present invention, it is possible to convert organic waste (biomass resources) such as vegetable waste and sludge currently disposed of in large quantities into a form that can be used effectively, and it is possible to realize inexpensive initial costs and running costs. This is a proposal for waste treatment technology.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1,
A processing vessel into which waste is charged, which is a vacuum vessel equipped with a stirring blade;
A vacuum pump that forcibly exhausts the inside of the processing tank to form a reduced-pressure atmosphere in the processing tank;
Heating means for heating and drying the waste put in the treatment tank by heating the treatment tank;
A moisture content detecting means for detecting that the moisture content of the waste in the treatment tank to be heated and dried has reached a predetermined moisture content;
Superheated steam supply means for supplying superheated steam into the treatment tank to dry and carbonize the waste in the treatment tank;
Cooling means for cooling the exhaust gas forced out of the treatment tank,
Equipped ,
Heating the treatment tank with the heating means while stirring in a reduced pressure atmosphere to heat and dry the waste thrown into the treatment tank, and heating the treatment tank with the heating means A first liquid formed by condensing volatiles in the exhaust gas by forcibly exhausting the exhaust gas with a vacuum pump and cooling the exhaust gas forcibly exhausted with the cooling means;
After the moisture content detecting means detects that the moisture content of the waste heated in the treatment tank has reached a predetermined moisture content, superheated steam is supplied into the treatment tank to remove the waste. A residue obtained by drying and carbonization;
The process tank to which the superheated steam is supplied is forcibly evacuated by a vacuum pump, and the evacuated exhaust is cooled by the cooling means to condense volatiles in the exhaust. A waste treatment apparatus for obtaining a liquid,
A branch tank that is communicated with the processing furnace and in which the first liquid or the second liquid is sent from the processing tank and stored;
A first water tank that communicates with the branch tank and that stores the first liquid stored in the branch tank from the branch tank;
A second water tank communicated with the branch tank and in which the second liquid stored in the branch tank is sent from the branch tank and stored;
A switching valve for switching the state in which the first liquid flows or does not flow from the branch tank to the first water tank, and the state in which the second liquid flows or does not flow from the branch tank to the second water tank. And
The switching valve detects that the moisture content of the waste heated in the treatment tank has reached a predetermined moisture content by the moisture content detecting means, and then transfers the first to the first water tank from the branch tank. It is switched to a state in which one liquid flows, and after drying and carbonization of the waste in the treatment tank by the superheated steam supply means, the second liquid is switched from the branch tank to the second water tank. is there.

  As effects of the present invention, the following effects can be obtained.

According to the present invention, wastes as biomass resources are converted into a state where they can be effectively used as high energy resources, and even wastes with a high water content can be efficiently dried and reduced in volume, saving energy.・ Low cost can be realized. In addition, carbide (charcoal) and combustible liquid can be obtained from the organic waste, and the waste can be effectively used as biomass resources and the volume of the waste can be further reduced.
Further, according to the present invention, since the drying treatment and the carbonization treatment can be performed in one treatment tank, the exhaust treatment apparatus can be configured in a compact manner, and the initial cost and running cost can be reduced.

Next, embodiments of the invention will be described.
1 is a diagram showing the configuration of a waste treatment system, FIG. 2 is a block diagram showing the configuration of a vacuum dryer, FIG. 3 is a block diagram showing another form of the configuration of the vacuum dryer, and FIG. 4 is a diagram of the waste treatment system. FIG. 5 is a block diagram showing a control configuration, FIG. 5 is a control flowchart of the waste processing system in waste processing, and FIG. 6 is a control flowchart of the waste processing system in waste processing.

  In the waste treatment method according to the embodiment of the present invention, the organic waste discarded as industrial waste is subjected to a drying treatment step for volume reduction drying, and further carbonization treatment for further carbonization and pyrolysis after further drying with superheated steam. Process.

In the drying treatment step, the waste is heated while being stirred in a treatment tank in a reduced-pressure atmosphere, and the waste is dried until a predetermined moisture content is obtained.
In the carbonization process, superheated steam is supplied into the treatment tank to further reduce the moisture content of the waste, and then the waste is carbonized and pyrolyzed. That is, it is set as the carbide | carbonized_material (charcoal) which can recycle the waste residue of waste as a valuable resource.
In this way, since the waste is pyrolyzed until carbonized, the volume is greatly reduced.
Further, in the carbonization process, the inside of the treatment tank is forcibly exhausted, and volatiles from the waste are dry-distilled and recovered from the exhaust to obtain combustible water that can be used for energy.
As described above, according to the present waste treatment method, waste can be effectively used as biomass resources, and the volume of waste can be further reduced.

  Subsequently, each process will be described in detail.

[Drying process]
First, the drying process will be described.
In the drying process, waste of about 40% of the internal volume of the processing tank is put into a processing tank, which is a sealed vacuum container, and the wall surface indirect heating method is used while stirring in a reduced-pressure atmosphere by forced exhaust. Heat.
Note that the amount of waste input to the treatment tank and the pressure of the treatment tank during the drying process are not limited to the above, and are appropriately adjusted according to the treatment tank and the waste.

As described above, since the waste is dried in a treatment tank in a reduced pressure (vacuum) atmosphere, the waste can be distilled and dried at a low temperature having a boiling point lower than 100 ° C. Accordingly, the drying can be completed quickly with high thermal efficiency, which can contribute to reduction of running cost.
Further, since the waste is mixed and pulverized while being stirred, it is possible to treat any form of waste such as slurry, paste, cake, and granular form.

[Carbonization process]
Subsequent to the drying treatment step, a waste carbonization treatment step is performed. This carbonization process will be described.
The drying process ends when the moisture content of the waste reaches a predetermined value (for example, 30%), or when the waste becomes dumped and the drying efficiency decreases, and forced exhaust in the treatment tank is performed. Canceled. Then, superheated steam is introduced into the treatment tank.

As the superheated steam, 180-600 ° C superheated steam is used. Superheated steam is a high-calorie gas with a calorific value of 958.6 kJ / m ³ at 500 ° C. and has a calorific value about four times that of hot air (238.6 kJ / m ³ ). Compared to the time, the moisture content of the waste can be reduced in a short time. Furthermore, waste can also be heated by radiant heat due to the coexistence of superheated steam and carbon monoxide. Since the radiant heat is a heat radioactive gas by infrared radiation, it can contribute to further shortening of the processing time.

  In the drying process by heating under reduced pressure, it is difficult to make the water content 10% or less, but in the drying process using superheated steam, the water content can be made 10% or less. That is, in the carbonization treatment step, the water content of the waste dried in the drying treatment step can be further reduced to reduce the volume.

The superheated steam is supplied until the waste is dried to further reduce the moisture content, and after the drying is completed, the waste undergoes a thermal decomposition reaction, and the pyrolysis residue becomes a carbide.
In this carbonization process, a reaction such as the following [Formula 1] occurs in the treatment tank.

[Formula 1]
_{C 1. 3 H 2 O 0} . 9 + 0.4H 2 O
= 0.8H ₂ + 0.7CO + 0.3CH ₄ + 0.3CO ₂ + 165.9kJ / mol
<Waste (biomass resources)> + <Superheated steam> = <Generated gas fuel> + <Endotherm>

As shown in the above equation, the waste that has reacted with the superheated steam is converted into a gaseous fuel component such as H ₂ , CO, CH ₄ , or CO ₂ . This gas fuel component can be condensed and recovered by dry distillation, and is separated into a vinegar solution and a dry distillation oil. The vinegar solution can be used as an organic fertilizer and the oil can be used as a fuel.
Moreover, the pyrolysis residue after carbonization can be effectively utilized as a carbide (charcoal).
Furthermore, the high-temperature exhaust from the treatment tank can be used for heating the treatment tank through a waste heat boiler and a heater.
Thus, the waste as biomass resources is converted into a state where it can be effectively used as high energy resources.

  In the carbonization process, when odorous gas is generated, the exhaust from the treatment tank can be oxidized and deodorized directly with a combustion type deodorizer to eliminate the odor. In this deodorizing apparatus, the exhaust gas from the treatment tank is burned at about 800 ° C. for about 2 seconds to be oxidized.

As described above, according to the waste treatment method including the drying treatment step and the carbonization treatment step, the moisture content of the waste can be reduced to 10% or less, and thereby the waste is a vegetable waste rich in sugar. Even if it is a case, it can be made to dry without generating stickiness.
In addition, first, under reduced pressure drying, the water content of the waste is reduced to a certain level, superheated steam is introduced, and further drying and carbonization are performed, so even in vegetable waste with a high water content It can be dried efficiently. Thereby, energy-saving and low-cost waste processing can be realized.

[Configuration of waste treatment system]
Subsequently, a configuration of a waste treatment system for carrying out the waste treatment method will be described.
As shown in FIG. 1, the waste treatment system 9 includes a treatment tank 12 that is a sealed vacuum vessel provided with a stirring blade 21 inside, and a vacuum pump as a forced exhaust means for forcibly exhausting the inside of the treatment tank 12. 56, a superheated steam generator 8 for supplying superheated steam into the processing tank 12, a heating system 35 as a heating means for heating the processing tank 12, and a gas forcedly exhausted from the processing tank 12 are cooled. Thus, a heat exchanger 37 and a cooling system 36 as cooling means for obtaining a distillate or a dry distillation liquid are included.
The processing tank 12, the stirring blade 21, the vacuum pump 56, and the like are configured as a vacuum dryer 10.

In the waste treatment system 9 according to the present embodiment, the drying treatment step and the carbonization treatment step are performed using one treatment tank 12. That is, the waste put into the treatment tank 12 of the vacuum dryer 10 is first dried and subsequently carbonized, and then discharged from the treatment tank 12.
By performing the drying treatment and the carbonization treatment in one treatment tank 12, the waste treatment system 9 can be configured in a compact manner, and the initial cost and running cost can be reduced.
However, the present invention is not limited to the above-mentioned form, first, after throwing waste into a treatment tank of a vacuum dryer and performing a drying treatment, the waste is moved to another treatment tank, The waste treatment system can also be configured to perform carbonization.

As shown in FIG. 2, the treatment tank 12 constituting the vacuum dryer 10 is provided with a jacket 13 around which a heat medium is conducted, and an agitating blade 21 that is rotated by being driven by a motor 16 is provided therein. .
The jacket 13 is connected to a transfer pipe 70 for supplying a heat medium from the heating system 35 and a transfer pipe 71 for returning the used heat medium to the heating system 35. The heat medium whose temperature has been adjusted by the heating system 35 is supplied into the jacket 13 of the treatment tank 12, and the heat medium whose temperature has been reduced by being used for heating is returned to the heating system 35 and heated again. . As the heat medium, it is possible to use superheated steam after the treatment tank 12 is conducted.

  A waste supply port 12 a is opened in the treatment tank 12. A supply pipe for supplying waste to the treatment tank 12 is connected to the supply port 12a, and a waste supply valve 47 is provided in the supply pipe. The waste supply valve 47 is driven to open and close under the control of a control device 90 described later.

  The processing tank 12 is provided with a supply port 12 e for introducing the superheated steam generated by the superheated steam generator 8 into the processing tank 12. A supply pipe for supplying superheated steam from the superheated steam generator 8 to the treatment tank 12 is connected to the supply port 12e, and a steam supply valve 48 is provided in the supply pipe. The water vapor supply valve 48 is driven to open and close under the control of the control device 90.

  Further, at the lower part of the processing tank 12, an outlet 12 b is opened for taking out the residue of the waste that has been subjected to the drying process and the carbonization process into the carbide, from the processing tank 12. The take-out port 12b is provided with a take-out valve 49 having an open / close cylinder 15 as an actuator. The extraction valve 49 is driven to open and close under the control of the control device 90. When the extraction valve 49 is opened, the residue is discharged out of the processing tank 12 through the extraction port 12b.

An exhaust port 12 c is opened at the top of the treatment tank 12 of the vacuum dryer 10. A suction pipe 23 is connected to the exhaust port 12 c via a filter unit 22, and a plate heat exchanger 37 is connected to the suction pipe 23.
The suction pipe 23 is provided with a relief valve 46. The relief valve 46 is opened and closed under the control of the control device 90.
Further, a nozzle 45 for supplying cleaning water for cleaning the filter unit 22 is provided above the filter unit 22, and the cleaning water is sprinkled from the nozzle 45 toward the filter unit 22. .

The heat exchanger 37 is fed with exhaust gas from the treatment tank 12 of the vacuum dryer 10 through the suction pipe 23, and is cooled and liquefied in the heat exchanger 37. This liquefied exhaust is referred to as “distilled liquid” or “dry distilled liquid”.
The heat exchanger 37 is connected to a transfer pipe 72 for transferring the liquid to the separation tank 53. The exhaust gas liquefied by the heat exchanger 37 is sent to the separation tank 53 through the transfer pipe 72. The distillate collected in the separation tank 53 is sent to the dry distillation water tank 40 through a waste liquid switching valve 43 that is a three-way valve, and the distillate accumulated in the separation tank 53 is passed through a waste liquid switching valve 43 to a distilled water tank 41. Sent to. In addition, the dry distillation liquid which accumulates in the dry distillation water tank 40 is a combustible liquid which can be used as a fuel, and the distillate liquid which accumulates in the distillation water tank 41 is mainly moisture.

  The separation tank 53 is provided with a motor-type vacuum pump 56. When the vacuum pump 56 is operated, the inside of the processing tank 12, the suction pipe 23, and the transfer pipe 72 is in a reduced pressure atmosphere, and the gas in the processing tank 12 is forcibly exhausted, and the suction pipe 23 and It is sent to the separation tank 53 through the transfer pipe 72.

Instead of the motor-type vacuum pump 56 in the separation tank 53, a water ejector-type vacuum pump 56 can be provided.
In this case, as shown in FIG. 3, the cooling water of the heat exchanger 37 can be circulated using the flowing water route of the water ejector type vacuum pump 56.
As shown in FIG. 3, in the heat exchanger 37, the steam generated from the processed material is cooled by the refrigerant supplied from the cooling system 36. In the cooling system 36, a refrigerant circulation circuit 73 including a cooling tower 50 and a pump 52 is configured.
The refrigerant circulation circuit 73 is connected to a suction water circulation circuit 74 used for the water ejector type vacuum pump 56. The suction water circulation circuit 74 is provided with a vacuum pump 56 and a ring water pump 58, and the coolant circulates through the suction water circulation circuit 74 by the ring water pump 58. As described above, the vacuum pump 56 performs vacuum suction using the flow of the refrigerant.

[Automatic configuration of waste treatment system]
Next, the control configuration of the waste treatment system 9 will be described.

As shown in FIG. 4, a waste supply valve 47 provided in the treatment tank 12 constituting the vacuum dryer 10, a water vapor supply valve 48 provided in the treatment tank 12, and an extraction valve provided in the treatment tank 12. 49, a relief valve 46 provided in the suction pipe 23, and a waste liquid switching valve 43 provided in the separation tank 53 are open / close drive means 47a, 48a, 49a, 46a, 43a for opening and closing these valve bodies. Is provided.
The opening / closing drive means 47a, 48a, 49a, 46a, 43a are all air cylinders, a piston that operates the valve body, a cylinder that moves the piston, and an electromagnetic valve that controls the supply of air to the cylinder Are provided.
Each of the opening / closing drive means 47a, 48a, 49a, 46a, and 43a is electrically connected to the control device 90 and operates under the control of the control device 90. That is, under the control of the control device 90, the waste supply valve 47, the water vapor supply valve 48, the take-out valve 49, the relief valve 46, and the waste liquid switching valve 43 are operated.

The control device 90 is electrically connected to a motor 16 that rotationally drives the stirring blade 21 of the vacuum dryer 10. The motor 16 is controlled by the control device 90 to rotate forward and reverse. , And stop.
Further, a vacuum pump 56 is electrically connected to the control device 90, and the vacuum pump 56 operates under the control of the control device 90.

  The control device 90 is electrically connected to a moisture content sensor 42 that is provided inside the treatment tank 12 of the vacuum dryer 10 and detects the moisture content of waste in the treatment tank 12. As the moisture content sensor 42, for example, detection means for directly detecting the moisture content (water content) of the waste, or detection means for indirectly detecting the moisture content of the waste by detecting a change in the mass of the waste. Alternatively, it is possible to employ detection means for detecting the amount of water vapor generated from the waste and indirectly detecting the moisture content of the waste.

[Flow of automatic control of waste treatment system]
The operation of the waste treatment system 9 is to select a manual operation type in which waste is input or a residue is discharged by an operator, or an automatic operation type in which control of these operations is performed by the control device 90. Can do.
Below, the flow of control by the control device 90 when automatically operating the vacuum dryer 10 will be described using the flowcharts shown in FIGS.

As shown in FIG. 5, first, the waste supply valve 47 is opened, and a predetermined amount of waste (for example, about 40% of the capacity of the processing tank 12) is charged into the processing tank 12 of the vacuum dryer 10. Is done. In the control device 90, a control signal is transmitted to the opening / closing drive means 47a so as to open the waste supply valve 47 (S1).
Then, in the control device 90, when a predetermined amount of waste is thrown into the processing tank 12 (S2), a control signal is transmitted to the opening / closing drive means 47a so as to close the waste supply valve 47 ( S3).

  It should be noted that the fact that a predetermined amount of waste has been introduced into the treatment tank 12 is detected by measuring the flow rate of a pump (not shown) for pumping the waste and the opening time of the waste supply valve 47. be able to. It is also possible to detect that a predetermined amount of waste has been thrown into the treatment tank 12 by detecting a decrease in the mass of the container in which the waste is stored or by detecting an increase in the mass of the treatment tank 12. can do.

Subsequently, the drying process is started.
At the time when the drying treatment process is started, a heat medium is introduced into the jacket 13 of the treatment tank 12 in advance by the heating system 35 and heated. In the drying process, the waste is heated with stirring under reduced pressure.
When the drying process is started, the control device 90 drives the vacuum pump 56 to start forced exhaust in the processing tank 12, and also drives the motor 16 to rotate the stirring blade 21. A control signal is transmitted to the pump 56 and the motor 16 (S4 and S5).

  In the present embodiment, the inside of the processing tank 12 is forcibly evacuated by the vacuum pump 56 so that the inside of the processing tank 12 has a degree of vacuum of about −0.093 MPa (the boiling point of water is 40 ° C.). By setting the reduced pressure state in this way, moisture in the waste evaporates at a low temperature, which can contribute to energy saving and low cost.

In the drying process, when the moisture content sensor 42 detects that the moisture content of the waste has reached a predetermined value (for example, 30%), the drying process ends (S6).
When the drying process is completed, the control device 90 stops the driving of the vacuum pump 56, and once opens the relief valve 46 so that the pressure becomes normal and then closes the vacuum pump 56 and the opening / closing driving means 46a. On the other hand, a control signal is transmitted (S7 / S8).

  When the drying process is completed, the separation tank 53 accumulates volatile matter (water) recovered from the waste. In the control device 90, a control signal is transmitted to the open / close drive means 43a so as to switch the waste liquid switching valve 43 provided in the separation tank 53 from the closed state to the state in which the distilled liquid flows into the distilled water tank 41 (S9). ). When the movement of the distillate accumulated in the separation tank 53 to the distilling water tank 41 is completed (S10), the controller 90 opens and closes the opening / closing drive means so that the waste liquid switching valve 43 provided in the separation tank 53 is closed. A control signal is transmitted to 43a (S11).

Subsequently, carbonization is started.
As shown in FIG. 6, when the carbonization process is started, the control device 90 opens the steam supply valve 48 to introduce superheated steam into the process tank 12 and drives the vacuum pump 56 to process the process tank. A control signal is transmitted to the opening / closing drive means 48a and the vacuum pump 56 so as to forcibly evacuate 12 (S12 and S13).
In the carbonization process, it is desirable that the stirring blade 21 is rotated so as to stir the waste, but the stirring blade 21 may be in a stopped state.

As described above, the steam supply valve 48 is opened to start the supply of superheated steam, and time measurement is started. As the carbonization time, a time necessary for carbonizing the waste is obtained in advance on a trial basis and set in the control device 90.
If a predetermined carbonization time elapses after the start of the carbonization process (S14), the controller 90 closes the water vapor supply valve 48 to stop the supply of superheated water vapor and stop the vacuum pump 56. Thus, a control signal is transmitted to the opening / closing drive means 48a and the vacuum pump 56 (S15, 16).
Thereby, carbonization processing is completed.

When the carbonization process is completed, the separation tank 53 stores the volatile matter (combustible liquid) generated by the thermal decomposition reaction of the waste as a dry distillation liquid.
In the control device 90, a control signal is transmitted to the opening / closing drive means 46a so that the relief valve 46 is once opened and closed after reaching normal pressure (S17).
Subsequently, a control signal is transmitted to the open / close drive means 43a so that the waste liquid switching valve 43 provided in the separation tank 53 is switched from the closed state to the state in which the dry distillation liquid flows into the dry distillation water tank 40 (S18). When the movement of the dry distillation liquid collected in the separation tank 53 to the dry distillation water tank 40 is completed (S19), the control device 90 opens and closes the waste liquid switching valve 43 provided in the separation tank 53 so as to be closed. A control signal is transmitted to 43a (S20).

Moreover, if carbonization processing is completed, the residue of the processing tank 12 will be discharged | emitted.
The control device 90 opens the extraction valve 49 and controls the opening / closing drive means 49a and the motor 16 so that the stirring blade 21 is rotated for a predetermined time so that the residue moves toward the extraction port 12b. Is transmitted (S21, S22).
The residue pushed out from the outlet 12b of the treatment tank 12 to the stirring blade 21 and discharged is charcoal and can be used as fuel.

The figure which shows the structure of a waste disposal system. The block diagram which shows the structure of a vacuum dryer. The block diagram which shows another form of a structure of a vacuum dryer. The block diagram which shows the control structure of a waste disposal system. The flowchart of control of the waste disposal system in waste disposal. The flowchart of control of the waste disposal system in waste disposal.

8 Superheated steam generator 9 Waste treatment system 10 Vacuum dryer 12 Treatment tank 21 Stirring blade 35 Heating system 36 Cooling system 37 Heat exchanger 40 Dry distillation tank 41 Distilled water tank 56 Vacuum pump

Claims (1)

A processing vessel into which waste is charged, which is a vacuum vessel equipped with a stirring blade;
A vacuum pump that forcibly exhausts the inside of the processing tank to form a reduced-pressure atmosphere in the processing tank;
Heating means for heating and drying the waste put in the treatment tank by heating the treatment tank;
A moisture content detecting means for detecting that the moisture content of the waste in the treatment tank to be heated and dried has reached a predetermined moisture content;
Superheated steam supply means for supplying superheated steam into the treatment tank to dry and carbonize the waste in the treatment tank;
Cooling means for cooling the exhaust gas forced out of the treatment tank,
Equipped ,
Heating the treatment tank with the heating means while stirring in a reduced pressure atmosphere to heat and dry the waste thrown into the treatment tank, and heating the treatment tank with the heating means A first liquid formed by condensing volatiles in the exhaust gas by forcibly exhausting the exhaust gas with a vacuum pump and cooling the exhaust gas forcibly exhausted with the cooling means;
After the moisture content detecting means detects that the moisture content of the waste heated in the treatment tank has reached a predetermined moisture content, superheated steam is supplied into the treatment tank to remove the waste. A residue obtained by drying and carbonization;
The process tank to which the superheated steam is supplied is forcibly evacuated by a vacuum pump, and the evacuated exhaust is cooled by the cooling means to condense volatiles in the exhaust. A waste treatment apparatus for obtaining a liquid,
A branch tank that is communicated with the processing furnace and in which the first liquid or the second liquid is sent from the processing tank and stored;
A first water tank that communicates with the branch tank and that stores the first liquid stored in the branch tank from the branch tank;
A second water tank communicated with the branch tank and in which the second liquid stored in the branch tank is sent from the branch tank and stored;
A switching valve for switching the state in which the first liquid flows or does not flow from the branch tank to the first water tank, and the state in which the second liquid flows or does not flow from the branch tank to the second water tank. And
The switching valve detects that the moisture content of the waste heated in the treatment tank has reached a predetermined moisture content by the moisture content detecting means, and then transfers the first to the first water tank from the branch tank. Switch to a state where one liquid flows, and after drying and carbonization of the waste in the treatment tank by the superheated steam supply means, switch to a state where the second liquid flows from the branch tank to the second water tank. Material processing equipment.

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