JP2022104843A - Overheating steam treatment device for organic waste - Google Patents

Abstract

To suppress heating costs of an overheating steam treatment device, and to easily transport a container body to a treatment process.SOLUTION: An overheating steam treatment device comprises: a main body container 1 which has an openable/closable waste feed opening provided in a top surface, an openable/closable waste discharge opening provided in a bottom surface, and an electric heater 3 built in a wall surface of the container; an agitation blade which is arranged inside the main-body container 1; a power supply connector which connects an electric heater 3 detachably to electric power supply means; a steam connector which connects the main-body container 1 detachably to overheating steam supply means; a power connector which connects a rotary shaft of the agitation blade detachably to the power supply means; and an exhaust gas connector which connects the main-body container 1 detachably to gas recovery means.SELECTED DRAWING: Figure 1

Description

The present invention relates to a superheated steam treatment apparatus suitable for a waste resource recovery and recycling facility.

A technique for heat-treating organic waste (garbage) with superheated steam is disclosed and proposed in the following patent documents.

Japanese Unexamined Patent Publication No. 2007-54815

Generally, when heat-treating organic waste with superheated steam, it is desirable to heat the treatment equipment to an appropriate temperature in advance. However, when the furnace (container) is heated by burning gas, petroleum, etc., there is a problem that it takes time to reach the target temperature and the fuel cost is high. It was also difficult to transport the processing equipment according to the processing process. On the other hand, the present invention provides an organic waste treatment apparatus having a novel structure that solves these problems.

The superheated steam treatment device according to the present invention is provided with a waste input port that can be opened and closed on the upper surface and a waste discharge port that can be opened and closed on the bottom surface. A stirring blade arranged in the above, a power supply connector for connecting the electric heater to the power supply means detachably, a steam connector for connecting the main body container to the superheated steam supply means detachably, and a rotating shaft of the stirring blade. It is characterized by including a power connector that is detachably connected to the power supply means and an exhaust gas connector that is detachably connected to the gas recovery means.

Since the superheated steam treatment device for organic waste according to the present invention is provided with a main body container having an electric heater built in the wall surface of the container, it does not take time to reach a target temperature and the electricity cost is low. Further, since it can be detachably connected to the power supply means, the superheated steam supply means, the power supply means, and the exhaust gas recovery means, the treatment can be executed while sequentially moving the places to the treatment station.

It is sectional drawing of the container body. It is sectional drawing of the wall surface of a container body. It is sectional drawing of an electric heater. It is a table which shows the heat exchange efficiency of various heaters. It is a table which shows the calorific value of various heaters. (A) to (c) are a plan view, a side view, and a front view of the processing apparatus of this invention. (A) to (c) are a plan sectional view, a side sectional view, and a front sectional view of the processing apparatus of this invention. (A) is a front sectional view in a state where the waste input port of the processing apparatus of this invention is opened, and (b) is a front sectional view in a state where a waste discharge port is opened. It is an overall perspective view of another example of an electric heater. It is a basic block diagram of a waste treatment facility. It is a top view which shows an example of a processing station.

The superheated steam treatment apparatus A according to the present invention is for accommodating organic waste such as industrial waste in an airtight container main body and injecting superheated steam to decompose and reduce the volume, and electricity is applied to the wall surface of the main body container. The feature is that the heater 3 is built-in.
Hereinafter, the structure of the container body will be described in detail.

FIG. 1 is a cross-sectional view of the main body of the container, and FIG. 2 is a cross-sectional view of the wall surface of the main body container.
The wall surface of the container body shown in this figure has the following features.
1. 1. The wall surface of the container body 1 has a SUS double structure.
2. 2. Organic waste enters the inside 2 of the container body 1.
3. 3. A plurality of electric heaters 3 are embedded so that the temperature of the wall surface can be raised to 600 to 700 ° C.
4. A refractory heat insulating brick 4 is incorporated for heat insulation.
5. Hold the refractory insulation brick 4 as a whole with asbestos wool 5.
6. Hold the asbestos wool 5 with the wire mesh 6 with screws.
9. The outer surface of the wall is composed of SUS304 (9).
10. The inner surface of the wall is composed of SUS316 (10).
11. The electric heater 3 is supported by the spacer 12.

FIG. 3 is a cross-sectional view of the electric heater.
The electric heater 3 has the following features.
1. 1. The heating element 3b is a ribbon-shaped metal plate coated with a heat-resistant material. A metal wire may be used instead of the ribbon-shaped metal plate. As the metal, for example, SUS304 can be used.
2. 2. The heating element 3b is housed inside the support tube 3c in a spirally curved state. The support tube 3c can be, for example, a copper tube.
3. 3. The heating element 3b is fed through the tube wiring 7.

FIG. 4 is a table showing the heat conversion efficiency of various heater wires. As shown in this table, the heat conversion efficiency of nichrome wire is 95.8%, the heat conversion efficiency of SUS304 is 87.2%, and the heat conversion efficiency of the electric heater 3 is 92%.

FIG. 5 is a table showing the calorific value of various heater wires. The numerical values in this table are the calorific value calculated when the voltage V = 20 [V] is applied to each of the heater wires for 90 minutes.
(1) Calorific value of nichrome wire heater Voltage V = 20 [V], current I = 3.8 [A], resistance value R = 5.26 [Ω],
Efficiency η = 0.872
H = 0.24 × 20 × 3.1 × 90 × 60 × 0.958 = 76977 [CAL]
(2) Calorific value of SUS304 heater Voltage V = 20 [V], current I = 4.6 [A], resistance value R = 4.35 [Q],
Efficiency η = 0.872
H = 0.24 × 20 × 4.6 × 90 × 60 × 0.872 = 103970 [CAL]
(3) Calorific value of electric heater 3 Voltage V = 20 [V], current I = 7.3 [A], resistance value R = 2.74 [Ω],
Efficiency η = 0.92
H = 0.24 × 20 × 7.3 × 90 × 60 × 0.92 = 174079 [CAL]

As shown in the table of FIG. 5, the electric heater 3 can generate a larger amount of heat than the nichrome wire heater or the SUS304 heater. The calorific value can be easily adjusted by the width and length of the plate material of SUS304, which is a heating element 3b. It is considered that the reason why the amount of heat generated by the electric heater 3 is large is that the resistance R of the heating element 3b is small and a large current flows, and the contribution of infrared radiation from the heat-resistant material is large. If the electric heater 3 is used, the surrounding area can be heated up to 1200 ° C. Further, since the electric heater 3 is embedded in the wall surface, heat generation is effectively used, and the cost is lower than that of a configuration in which a gas heater, an oil heater, or the like is provided outside. In addition, it has the feature that it generates heat immediately after energization and instantly returns to the normal temperature (about 3 seconds) when the energization is cut off, and the wall surface can be heated in a short time.

Next, another example of the superheated steam treatment apparatus A according to the present invention will be described.
6 (a) to 6 (c) are front views, plan views and side views of other examples of the superheated steam treatment apparatus, and FIGS. 7 (a) to 7 (c) are front sectional views and planar sectional views corresponding to them. It is a figure and a side sectional view. Further, FIG. 8A is a front sectional view in a state where the waste inlet is open, and FIG. 8B is a front sectional view in a state where the waste discharge port is open.

The main body container 1 has a rectangular shape, and is provided with a waste input port 1a that can be opened and closed on the upper surface and a waste discharge port 1b that can be opened and closed on the bottom surface.

The electric heater 3 embedded in the wall surface of the main body container 1 is of a different type from the above example.
A plurality of steam connectors 1c are provided on the front surface of the main body container 1. The steam connector 1c has a structure that can be easily connected to and separated from the steam supply means installed outside, has a check valve to prevent the leakage of steam, and has a nozzle facing diagonally downward inside the main body container 1. It communicates with 1d.
An exhaust gas connector 1e is provided on the back surface of the main body container. The exhaust gas connector 1e has a structure that can be easily connected to and separated from an exhaust gas recovery means installed outside, and has a check valve for preventing leakage of exhaust gas.
A plurality of waste liquid discharge ports 1f are provided on the bottom surface of the main body container. The waste liquid discharge port 1f has a check valve for preventing leakage of the waste liquid.
A power connector (not shown) is provided on the side surface of the main body container. The power connector has a structure that can be easily connected to and separated from an externally installed power supply means, and power is supplied to the electric heater 3 from here.
Inside the main body container 1, 1 g of stirring blades for stirring organic waste are arranged. The shaft rod of the stirring blade 1g is rotatably supported by the bearing 1i provided on the side surface of the main body container. The bearing 1i is a power connector that can be easily connected to and separated from a power supply means installed outside, and the stirring blade 1g is rotated by the power input from the power connector.
At the four corners of the bottom surface of the main body container, legs 1h corresponding to a transport means such as a trolley with wheels are provided for the superheated steam treatment device A. This means of transportation will be described later.

FIG. 9 is an overall perspective view of another example of the electric heater.
More specifically, the electric heater 3 is a ladder made of a heat-resistant support member formed of a mica plate and a silica plate so that a ribbon-shaped metal plate coated with a heat-resistant material forms a plate shape as a whole as a heating element 3b. It is a flat heater that is bent a plurality of times inside the support frame 3d of the shape. A tube wiring 7 is connected to the heating element 3b.
Since the electric heater 3 having such a structure is a flat type, it can be easily embedded in the peripheral wall of the main body container 1, and the heating element 3b can be made dense, so that the amount of heat generated can be increased. If the electric heater 3 can be inserted and installed as a unit in the heater insertion port formed on the end surface of the peripheral wall of the main body container 1, the maintainability is greatly improved.

FIG. 10 is a basic configuration diagram of a waste treatment facility configured by using the superheated steam treatment apparatus according to the present invention.
This waste treatment facility A has a plurality of superheated steam treatment devices A ... that are moved in a state of storing organic waste, and a plurality of treatments that are sequentially arranged along the movement path 31 of the superheated steam treatment device A .... It is composed of stations 20 ... At this time, it is efficient to make the movement path 31 a one-way loop. Further, if the processing stations 20 ... Are arranged at the same intervals as the superheated steam treatment device A ..., a plurality of superheated steam treatment devices A ... can be processed in parallel at the same time.
The treatment station 20 ... is provided corresponding to each stage of heat treatment of organic waste. That is, a station for injecting organic waste or the like into the main body container 1, one or more stations for injecting superheated steam or a specific gas into the main body container 1, a station for injecting cooling water mist or the like into the furnace. , There is a station for discharging treated waste from the main body container 1.
In the superheated steam treatment device A of this example, each of the main body containers 1 ... Is mounted on a bogie 32 equipped with wheels, connected at equal intervals by a link arm (not shown) or the like, and an electric locomotive arranged in a suitable place. A vehicle (not shown) or the like moves and stops all at once along the movement route 31. Instead of using an electric locomotive, the carriage 32 of a part of the superheated steam treatment device A may be electric. As described above, the waste treatment facility A includes the transportation means 30, that is, the trolley 32, the movement route 31, and the like of the superheated steam treatment device A. The transportation means 30 is not limited to this, and may be a conveyor or the like. Alternatively, each of the superheated steam treatment furnaces ... may be mounted on a vehicle having an automatic operation function, or may be combined with a transportation means 30 such as a crane. That is, the superheated steam treatment device A corresponds to the transportation means 30 for transporting the inside of the treatment facility as possible.

FIG. 11 is a schematic plan view of the processing station.
The processing station 20 includes a superheated steam supply means 21 for injecting superheated steam into the main body container 1, a gas recovery means 22 for recovering exhaust gas from the main body container 1, and a power supply means 23 for rotating the stirring blade 1 g. Has been done.
The superheated steam supply means 21 and the gas recovery means 22 are installed in a tunnel form with respect to the movement path 31, and the power supply means 23 is installed in a form along the movement path 31. The processing station 20 also includes a power supply device (not shown).
The steam injection means 21 is provided with a boiler or the like (not shown), and is configured so that the heat-resistant tube 21a can be detachably connected to the steam connector 1c to inject superheated steam. The tip of the heat-resistant tube 21a is a communication connector.
The exhaust gas recovery means 22 is provided with gas separation means, filter means, etc. (not shown), and is configured so that the heat-resistant tube 22a can be detachably connected to the exhaust gas connector 1e to recover the exhaust gas. The tip of the heat-resistant tube 22a is a communication connector.
The motor means 23 includes an electric motor and a power transmission mechanism, and is configured so that the shaft 23a can be detachably connected to the power connector so that the stirring blade 1g can be rotated.
The power supply means 24 includes an AC or DC power supply circuit, and is configured to detachably connect a power cable to the power connector to supply power to the electric heater 3.

As can be understood from the explanation of this example, the superheated steam treatment apparatus according to the present invention can be combined with a treatment station 20 having a function of supplying superheated steam to the main body container to treat organic waste with superheated steam. It is possible to heat it. Then, at the same time as injecting the superheated steam, the surface wall of the main body container 1 is heated by the electric heater 3, so that the temperature drop of the superheated steam is suppressed and efficient heat treatment becomes possible. Since this heat treatment is performed without supplying oxygen, a large amount of resources such as combustible gas contained in the exhaust gas can be recovered.
Further, by appropriately setting the number of superheated steam treatment devices A ... and the number and configuration of the treatment stations 20 according to the type and amount of waste, it is possible to construct a waste treatment facility A without waste. In particular, since it is possible to predict in advance what kind of exhaust gas will be generated at what temperature depending on the type of organic waste, it is desirable to perform stepwise heat treatment according to the type. The stepwise heat treatment is possible by gradually raising the temperature of the superheated steam in one treatment station 20. Alternatively, a plurality of processing stations 20 ... may be arranged along the moving path 31 of the superheated steam processing device A ..., and the temperature of the superheated steam may be set to be higher toward the downstream processing station 20.

A Superheated steam treatment device 1 Container body 1a Waste input port 1b Waste discharge port 1c Steam connector 1e Exhaust gas connector 1g Stirring blade 1i Power connector 21 Superheated steam supply means 22 Gas recovery means 23 Power supply means 24 Power supply means 3 Electric heater 3b Heat generator 3d Support frame 3c Support pipe 30 Transportation means

Claims (4)

A main container with a waste input port that can be opened and closed on the top surface and a waste discharge port that can be opened and closed on the bottom surface, and an electric heater built into the wall surface of the container.
With the stirring blades arranged inside the main body container,
A power connector that detachably connects the electric heater to the power supply means,
A steam connector that detachably connects the main body container to the superheated steam supply means,
A power connector that detachably connects the rotating shaft of the stirring blade to the power supply means,
An exhaust gas connector that allows the main body container to be detachably connected to the gas recovery means,
A superheated steam treatment device for organic waste, which is characterized by being equipped with. In claim 1,
The electric heater is a flat type heater in which a ribbon-shaped metal plate coated with a heat-resistant material is used as a heating element and is bent a plurality of times inside a support frame so as to form a plate as a whole. Superheated steam treatment equipment for things. In claim 1,
The electric heater is an organic rod-shaped heater in which a ribbon-shaped metal plate coated with a heat-resistant material is used as a heating element and is spirally curved inside a support tube so as to have a cylindrical shape as a whole. Superheated steam treatment equipment for waste. In any one of claims 1 to 3,
The superheated steam treatment device is a superheated steam treatment device for organic waste, which is compatible with a means of transportation for transporting the inside of a treatment facility.

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