JP4058729B2 - High moisture waste system discharge device in RDF manufacturing system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the technical field of municipal waste treatment, new recycling-related technologies aiming at a waste resource recycling society are attracting attention, and one of them is the solid waste fuel technology, that is, RDF (Refuse Derived Fuel) technology. .
[0002]
The RDF technology has advantages such as (1) high waste recycling rate, (2) relatively easy dioxin countermeasures, and (3) good storage and transportability. Because it has the advantage that it is easier to obtain the consent of the residents, which is a problem, compared to incinerators, it is expected to spread in the future as a small and medium-sized garbage disposal technology.
[0003]
In addition, the Ministry of Health and Welfare's new guidelines for countermeasures against dioxins state that “RDF conversion is effective as a countermeasure against dioxins in small and medium-sized garbage disposal facilities” and is expected to become an increasingly important technology in the future.
[0004]
The present invention relates to the above RDF production system, and more particularly to an apparatus for discharging high moisture waste out of the system as waste of RDF in the RDF production system.
[0005]
[Prior art]
FIG. 1 shows an example of the flow of the RDF manufacturing system. Garbage, which is a raw material, is crushed by a crusher, dried by a dryer, and after removing foreign substances such as ferrous metals and non-ferrous metals in a magnetic separator and a non-ferrous separator, it is compression-molded by a molding machine into RDF. Is done. During this time, the waste is transferred by a belt conveyor, a screw conveyor for quantitative supply, a rotary valve, or the like.
[0006]
[Problems to be solved by the invention]
In the above system, if the waste is not sufficiently dried by the dryer, there arises a problem that the RDF molding rate is reduced, and mold and rot odor are likely to occur. In particular, high-moisture waste is likely to be generated when starting up a system where the dryer has not been sufficiently warmed up, or when stopping the system in which the heat source of the dryer is turned off. At present, the above problem is dealt with by discharging waste from the system only for a certain period of time when starting and stopping the system. However, with this method, low-moisture waste is also discharged, resulting in a decrease in yield.
[0007]
The object of the present invention is to avoid wasteful waste discharge by allowing only high-moisture waste to be efficiently discharged out of the system when the drying of the waste by the dryer becomes insufficient in the RDF manufacturing system. , To improve the yield.
[0008]
[Means for Solving the Problems and Effects of the Invention]
In the RDF production system according to the present invention, the high moisture waste outside discharge device is a moisture meter that measures the moisture content of the waste discharged from the drying device in the RDF production system including a drying device that dries the raw material before compression molding. And a damper that switches the waste path after moisture measurement between inside and outside the system, and when the moisture measurement data output from the moisture meter is lower than the set value, the waste path is inside the system and If it is too high, it is provided with a control device for controlling the damper so as to switch the waste path outside the system.
[0009]
In the above-mentioned high moisture waste system discharge device, the moisture of the waste discharged from the dryer is measured by a moisture meter, and the damper is connected to the waste path by the control device based on the moisture measurement data output from the moisture meter. Is appropriately switched between in-system and out-of-system. That is, when the moisture measurement data output from the moisture meter is lower than the set value, the garbage path is switched into the system, and when the moisture measurement data is higher than the set value, the garbage path is switched out of the system. The damper is controlled. Therefore, according to the above apparatus, only high moisture waste can be automatically discharged out of the system at the time of system startup or when the system is stopped when drying of the waste by the dryer is insufficient.
[0010]
In the high moisture waste extrapolation device in the RDF manufacturing system according to the present invention, the control device can only pass the waste path when moisture measurement data lower or higher than the set value is continuously output from the moisture meter for a predetermined time. It is preferable that the damper is controlled so as to switch the system inside or outside the system.
[0011]
Since the raw material waste also includes raw garbage with a variation in moisture, there may be a situation where the waste path is frequently switched by the damper. Therefore, as described above, if the moisture measurement data that is lower or higher than the set value is output from the moisture meter for a predetermined period of time, it is possible to perform more stable processing by switching the waste path with the damper. It becomes.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
2 to 5 show an embodiment of the present invention. The overall flow of the RDF manufacturing system is the same as that shown in FIG.
[0013]
As shown in FIG. 2, the RDF production system includes a dryer (1) that dries the raw material before compression molding. And in this RDF manufacturing system, a moisture meter (2) that measures the moisture content of the garbage from the dryer (1), and a damper (3) that switches the route of the garbage after moisture measurement between inside and outside the system. When the moisture measurement data output from the moisture meter (2) is lower than the set value, the damper is used to switch the waste path into the system, and when it is higher than the set value, the dust path is switched out of the system. There is provided a high moisture waste system discharge device comprising a program sequencer (4) for controlling 3).
[0014]
The moisture meter (2) is disposed above the first conveyor (5) for transporting the garbage discharged from the dryer (1). As the moisture meter (2), for example, an infrared moisture meter that measures an absorption spectrum of infrared water molecules is used.
[0015]
A hopper (6) is disposed below the front end of the first conveyor (5). The damper (3) is formed of a cylindrical body whose upper end is attached to the lower end of the hopper (6) so as to be swingable in the front-rear direction. As shown in detail in FIG. 3, the damper (3) is attached to the outside of the lower end portion of the hopper (6) by a pair of mounting shafts (7), so that dust adheres to the mounting shaft (7). There is no risk of clogging between the damper (3) and the hopper (6). Below the damper (3), a second conveyor (8) for transporting the waste to a magnetic separator (not shown) and an out-of-system waste collection container (9) are arranged side by side. When the lower end of the damper (3) is directed forward, i.e., toward the second conveyor (8), the waste path is in the system. On the other hand, when the damper (3) is directed rearward, that is, toward the container (9), the waste path is out of the system.
[0016]
FIG. 4 shows another embodiment of the damper. In FIG. 4, branch portions (161) and (162) branching back and forth are formed at the lower end portion of the hopper (16). Both branch parts (161) and (162) have lower ends facing the second conveyor (8) and the container (9), respectively. And the plate-shaped damper (13) is attached to the base of both branch parts (161) (162) so that tilting in the front-back direction is possible.
[0017]
The program sequencer (4) includes a detection unit that detects a damper posture (orientation), an operation unit that switches the damper posture (orientation), a damper posture data output from the detection unit, and a moisture meter. An instruction processing unit that performs processing based on the moisture measurement data of the waste and outputs the operation data to the operation unit is provided. The operation unit is configured by, for example, a motor or a hydraulic / pneumatic cylinder device.
[0018]
FIG. 5 shows a control flow by the program sequencer (4). When the sequencer (4) is started, first, it is confirmed from the damper attitude data output from the detection unit whether the attitude (direction) of the dampers (3) and (13) is in the system or outside the system. When the damper (3) is out of the system, the process proceeds to the next step. On the other hand, when the dampers (3) and (13) are in the system, operation data is output to the operation unit so that the dampers (3) and (13) are switched out of the system. Next, the moisture measurement data output from the moisture meter (2) is compared with a preset value. Here, the set value may be adjusted to the ideal moisture value of the dust suitable for compression molding. When the output of low moisture data lower than the set value continues for a certain time (tsec), the dampers (3) and (13) are switched into the system. If the output of low moisture data does not continue for a certain period of time, the process returns to the previous step. On the other hand, when the output of high moisture data higher than the set value continues for a certain time (tsec), the dampers (3) and (13) are switched out of the system. If the high moisture data output has not continued for a certain time, the process returns to the previous step. In this way, only the high moisture waste that is not suitable for compression molding out of the waste discharged from the dryer (1) is automatically and stably discharged out of the system.
[Brief description of the drawings]
FIG. 1 is a diagram showing a flow of an RDF manufacturing system.
FIG. 2 is a vertical cross-sectional view of the high moisture waste system discharge apparatus according to the present invention.
FIG. 3 is a horizontal sectional view showing a damper of the high moisture waste system discharge apparatus.
FIG. 4 is a horizontal cross-sectional view showing another embodiment of the damper of the high moisture waste system discharge apparatus.
FIG. 5 is a diagram showing a control flow by the program sequencer of the high moisture waste system discharge apparatus.
[Explanation of symbols]
(1)… Dryer (drying equipment)
(2) Moisture meter
(3)… Damper
(13)… Damper
(4) Program programmable controller (control device)

Claims (4)

In an RDF manufacturing system equipped with a drying device that dries the raw material waste before compression molding, the system uses high-moisture waste from the dryer when the system is started up and when the system is shut down. A device for discharging outside ,
When the moisture meter that measures the moisture content of the garbage from the drying device, the damper that switches the path of the garbage after moisture measurement to the inside and outside of the system, and the moisture measurement data output from the moisture meter is lower than the set value the in the system the path of the garbage, Ri Na and a control device is higher than the set value to control the damper to switch the path of the waste out of the system,
Only when the moisture measurement data lower or higher than the set value is continuously output from the moisture meter for a predetermined time, the control device controls the damper to switch the waste path to or from the system. and it has a high moisture waste system outside the discharge device in RDF production system. A moisture meter is disposed above the first conveyor for transporting the garbage from the dryer, a hopper is disposed below the front end of the first conveyor, and the damper is mounted in a pair on the outside of the lower end of the hopper. The high moisture refuse system outside discharge device in the RDF manufacturing system according to claim 1 which consists of a cylindrical body attached so that rocking in the direction of order by a shaft is possible . A moisture meter is disposed above the first conveyor for transporting the garbage from the dryer, and a hopper having a branching portion branched forward and backward at the lower end is disposed below the front end of the first conveyor. The high moisture waste extra-drainage device in the RDF manufacturing system according to claim 1, wherein the damper is plate-like and attached to the base of both branch portions of the hopper so as to be tiltable in the front-rear direction. The control device performs processing based on a detection unit that detects the damper posture, an operation unit that switches the damper posture, damper posture data output from the detection unit, and waste moisture measurement data output from the moisture meter. The high moisture waste system outside discharge device in the RDF manufacturing system according to any one of claims 1 to 3, comprising a program sequencer including an instruction processing unit for performing operation and outputting operation data to the operation unit.

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