JP4360030B2 - Garbage dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a kiln type garbage dryer used to perform a garbage drying process as a pre-main reaction process when combustible garbage such as municipal garbage is converted into a solid fuel.
[0002]
[Prior art]
In recent years, it has been attempted to recycle resources by treating and processing combustible waste such as municipal waste, and one of them is a method of converting municipal solid waste into solid fuel (RDF). Numerous processes have been proposed and put into practical use.
[0003]
An example of a method for converting municipal waste into solid fuel is as shown in the flow of FIG. 2. The received and supplied waste is sent to the primary crushing process section I for primary crushing (coarse crushing). Send to the pre-main reaction process part II, dry the garbage so that it is in a dry state suitable for the reaction in the downstream main reaction process part V, and then send the dried waste to the sorting process part III After removing the metals, it is sent to the secondary crushing process part IV, and then secondary crushed (finely pulverized) to a size suitable for compression molding in the downstream compression molding process part VII, and then secondary crushing The debris is sent to the main reaction process section V, where the crushed debris stays for a certain period of time, mixes, reacts, and evaporates the moisture to adjust the moisture, and further sends the adjusted moisture to the sorting process section VI. After removing the non-combustible material, the waste is sent to the compression molding process section VII to a predetermined shape. Was formulated, finally, feed dust solidified to a drying process unit VIII, moisture dust solidified are set as the solid fuel by drying to a predetermined ratio or less.
[0004]
Among the garbage dryers used in the previous main reaction process part II of the above-mentioned solid fuel production method, the kiln type is a horizontally placed drum as shown in FIGS. 3 (a) and 3 (b). 1 is supported by an inlet-side end plate 2 and an outlet-side end box 3 that are fixedly arranged, respectively, via a rotary seal joint 4 so that the drum 1 is supported by the inlet-side end plate. 2, the outlet side end box 3 is arranged so as to be slightly lower, and a dust feeder 9 is installed on the inlet side end plate 2 of the drum 1, while the outlet side end box 3 has a lower part. A hot air blowing duct 7 for blowing hot air 6 generated in the hot air generating furnace 5 into the drum 1 is provided at a position near the center of the drum 1. Insert and place both ends The inlet end plate 2 and the outlet end box 3 are fixedly supported, and the hot air blowing duct 7 lifts the dust 10 supplied into the drum 1 by the inlet side dust feeder 9 as the drum 1 rotates. A plurality of blowing nozzles 8 for blowing the warm air 6 toward the repose angle forming region where it is naturally dropped and projecting within the required angular range in the circumferential direction, and attached at a required interval in the longitudinal direction; In order to prevent the dust 10 that is transported upward beyond the repose angle forming region in the drum 1 and falling on the upper surface of the hot air blowing duct 7 or the surface of the blowing nozzle 8 from being overheated, A dust accumulation prevention cover 11 having an upper portion formed in a mountain shape is attached in a roof shape so as to cover the tip of the blowing nozzle 8 from above the hot air blowing duct 7, and a heat insulating material 16 is filled in the cover 11; Hot air blowing In addition to making it difficult for dust to accumulate on the dust 7 and the blowing nozzle 8, heat insulation from the hot air blowing duct 7 is suppressed by the heat insulating material 16 to prevent overheating of the dust accumulated on the dust accumulation prevention cover 11. During the time until the dust 10 supplied into the drum 1 by the dust feeder 9 is discharged into the outlet side end box 3 while rotating the drum 1 at a low speed in the direction of the arrow X, the hot air blowing duct 7, the hot air 6 blown through the blow nozzles 10 from the inside 7 is dried so as to be in a state suitable for the reaction in the downstream main reaction process section.
[0005]
Further, in the above-mentioned waste dryer, in order to prevent overdrying due to a sudden change in waste quality, for example, when waste that has already been almost dried is supplied, the end plate on the inlet side of the drum 1 is used. 2 and the outlet side end box 3 are equipped with watering nozzle pipes 12, and the watering nozzle pipe 12 sprays water as needed to adjust the drying state and temperature of the waste.
[0006]
In FIG. 3 (a), reference numeral 13 denotes a circulation fan for circulating and supplying a part of the exhaust gas after drying the garbage 10 to the hot air generating furnace 5, and reference numeral 14 is an exhaust fan for guiding the remainder of the exhaust gas to the other. , 15 indicates a blower for supplying combustion air to the burner 5a of the hot air generating furnace 5.
[0007]
[Problems to be solved by the invention]
However, in the case of the above-mentioned waste dryer, although the drying state of the waste 10 can be adjusted to some extent by watering from the watering nozzle tube 12, the watering nozzle tubes 12 are provided at the positions on both ends in the longitudinal direction of the drum 1. Therefore, the drying state of the waste 10 supplied into the drum 1 cannot be adjusted at a stretch over the entire length of the drum 1. Further, the dust accumulation prevention cover 11 on the hot air blowing duct 7 is formed in a mountain shape at the top to prevent the accumulation of the dust 10, but depending on the property and shape of the dust 10, it is left as it is at the top. In this case, since the heat insulating material 16 is filled, heat transfer from the hot air blowing duct 7 to the accumulated waste 10 on the dust accumulation preventing cover 11 is performed by the heat insulating material 16. Although the accumulated dust 10 is heated directly by the warm air 6 flowing in the drum 1, the accumulated dust 10 may be overheated, and the dust 10 in the drum 1 is placed on the dust accumulation prevention cover 11. Together with the waste 10 in the overheated state, the waste 10 in the drum 1 is overheated as a whole, and when it is discharged as it is, the main reaction in the downstream main reaction process section is performed. May cause trouble.
[0008]
Therefore, the present invention enables the drying adjustment of the dust in the drum as a whole to be performed all at once when there is a possibility that the dust becomes excessively dry due to a sudden change in the properties of the dust. It is intended to prevent the dust deposited on the dust accumulation prevention cover from being overheated.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has a drum supply side as a waste supply side and the other end as a waste discharge side, and the waste supply side and the waste discharge side. A water spray nozzle pipe is installed so that water can be sprayed into the drum, and a hot air blowing duct having a large number of blowing nozzles in the longitudinal direction is inserted and fixed in the drum, and each blowing nozzle is inserted from the hot air blowing duct. In the garbage dryer that is configured to dry the dust in the drum by the warm air blown into the drum through the upper part of the hot air blowing duct located in the drum, the upper part is formed in a mountain shape. provided with a dust deposition preventive cover in which the internal air-cooled jacket, the one or both of the upper and lower positions within the drum, a water spray tube having a plurality of water spray nozzles in the longitudinal direction, of the drum Jikukokorokata And disposed in the diverging water pipe and construction made by fixedly supported on the cover for preventing the dust deposition.
[0010]
In the case where the garbage becomes excessively dry due to a sudden change in the property of the garbage, water should be sprayed from the water nozzles of the water pipes at the upper position and / or the lower position in the drum. By doing so, the drying temperature of the dust in the drum can be adjusted at a stretch as a whole.
[0011]
Further, as described above, the upper over the entire length of the warm-air blow write duct located within the drum, there are a configuration in which a dust deposition preventive cover in which the internal air cooling jacket forms a top to the mound Therefore , even if a situation where dust accumulates on the dust accumulation prevention cover occurs, the accumulated dust is actively cooled by the air cooling jacket, so that it does not become overheated.
[0012]
Furthermore, by adopting a configuration in which a water spray pipe having a large number of water spray nozzles in the longitudinal direction is inserted into the hot air blowing duct, when the operation is stopped, in addition to the water spray from the water spray pipe at the upper and lower positions in the drum, If water is sprayed simultaneously by the water spray pipe in the wind blowing duct, the inside of the drum can be rapidly cooled.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIGS. 1 (a) and 1 (b) show an embodiment of the present invention. In the kiln-type dust dryer having the same configuration as shown in FIGS. 3 (a) and 3 (b), a dust accumulation prevention cover is shown. A portion of the heat insulating material 16 filled in the upper part of the inside 11 is an air cooling jacket 21. That is, a partition plate 24 is provided over the entire length between the dust accumulation prevention cover 11 and the side of the hot air blowing duct 7, and between the upper portion of the warm air blowing duct 7 and the dust accumulation prevention cover 11. A space portion is formed, a cooling air supply portion 21a is provided at one end of the space portion, a cooling air discharge portion 21b is provided at the other end of the space portion, and the space portion is used as an air cooling jacket 21. The dust 10 deposited on the dust accumulation prevention cover 11 can be actively cooled by the air cooling jacket 21.
[0015]
Further, a water spray pipe 18 in which a large number of water spray nozzles 17 are provided upward at a predetermined interval in the longitudinal direction is provided at an upper position in the drum 1 so as to be guided along the longitudinal direction of the drum 1. 18 is fixedly supported on the top of the dust accumulation prevention cover 11, and a water spray pipe 20 having a number of water spray nozzles 19 provided downward at a predetermined interval in the longitudinal direction is provided at a lower position in the drum 1. The water spray pipe 20 is guided along the longitudinal direction of the drum 1, and the water spray pipe 20 is fixedly supported on the lower end edge of the dust accumulation prevention cover 11. The water is sprayed over the entire length area in 1.
[0016]
Further, a water spray pipe 23 having a large number of water spray nozzles 22 facing upward in the longitudinal direction at a lower position in the warm air blow duct 7 is guided along the longitudinal direction of the hot air blow duct 7. It is installed and fixed so that water can be sprayed over the entire length into the hot air blowing duct 7 by the watering nozzle 22 of the watering pipe 23.
[0017]
When the dust dryer having the above-described configuration is operated, the hot air 6 guided from the hot air generating furnace 5 into the hot air blowing duct 7 is rotated into the drum 1 through the blowing nozzle 8 while rotating the drum 1 at a low speed. The air for cooling is circulated through the air cooling jacket 21 in the dust accumulation prevention cover 11 provided at the upper part of the hot air blowing duct 7. In this state, if the dust 10 is sequentially supplied into the drum 1 by the dust feeder 9, the dust 10 supplied into the drum 1 is transferred from the end plate 2 side to the end box as in the conventional case. While being moved to the side 3, the air is dried by the hot air 6 blown from the blow nozzle 8 while being stirred by the rotation of the drum 1, and is discharged from the end box 3.
[0018]
In the operation state as described above, when the dust 10 falling after being transported upward beyond the repose angle formation region with the rotation of the drum 1 adheres and accumulates on the dust accumulation prevention cover 11, the accumulated dust 10 can be positively cooled by the air-cooling jacket 21, so that it can be prevented from being overheated by the warm air 6 blown into the drum 1 . Therefore, even if the dust 10 accumulated on the dust accumulation prevention cover 11 is dropped, the dust in the drum 1 is not overheated. The main reaction will not be disturbed.
[0019]
Further, in the present invention, the sprinkling pipes 18 and 20 are arranged in the upper position and the lower position in the drum 1 in parallel with the longitudinal direction of the drum 1. Even when the waste 10 is supplied into the drum 1 and is in an overdried state, the water spray nozzles 17 and 19 of the water spray pipes 18 and 20 spray water all at once in the longitudinal direction in the drum 1. can do. Thereby, moderate dampness can be given to garbage 10 and overdrying can be prevented. At this time, if necessary, watering by the watering nozzle pipes 12 on both ends of the drum 1 may be used in combination.
[0020]
When the operation of the garbage dryer is stopped, when it is necessary to cool the drum 1 quickly, in addition to the water spraying by the water spray pipes 18 and 20, it is installed in the hot air blowing duct 7. Water is also sprayed from the sprinkling pipe 23. Thereby, the drum 1 can be rapidly cooled.
[0021]
In addition, this invention is not limited only to the said embodiment, For example, although the case where the sprinkling pipes 18 and 20 were arrange | positioned in both the upper position and the lower position in the drum 1 was shown, either one was shown. Of course, various modifications may be made without departing from the scope of the present invention.
[0022]
【The invention's effect】
As described above, according to the waste dryer of the present invention, the drum supply side and the waste discharge side are arranged so that one end side of the drum that can be rotated horizontally can be the waste supply side and the other end side is the waste discharge side. On the side, a water spray nozzle pipe is installed so that water can be sprayed into the drum, and a hot air blowing duct having a large number of blowing nozzles in the longitudinal direction is inserted into the drum and fixed, and from inside the hot air blowing duct In the waste dryer that dries the waste in the drum by the hot air blown into the drum through each blow nozzle , the upper part of the hot air blow duct located in the drum is formed in a mountain shape at the top. forming the inside provided with a dust deposition preventive cover having a cooling jacket, to one or both of the upper and lower positions within the drum, a water spray tube having a plurality of water spray nozzles in the longitudinal direction, the drum And disposed in the axial direction, since the diverging water tube as a configuration in which a is fixedly supported on the cover for preventing the dust deposition, dust when it may become over-drying, the water spray pipe is disposed in the drum By performing water spraying through a large number of water spray nozzles, it is possible to adjust the drying of the dust in the drum all at once, and as described above , the hot air blowing duct located in the drum can be adjusted. the top over the entire length, so to form a top to the chevron are a structure in which a dust deposition preventive cover in which the internal air-cooled jacket, even if dust deposited on the cover for preventing dust deposition, deposition Waste can be actively cooled with an air-cooling jacket to prevent overheating, and a sprinkling pipe with a number of sprinkling nozzles in the longitudinal direction is inserted into the hot air blowing duct. Arranged With formed, by combination with watering sprinkler according diverging water pipe by sprinkling pipe in the drum, it is advantageous to be able to quench the drum when the operation is stopped, it exhibits excellent effects and the like.
[Brief description of the drawings]
1A and 1B show an embodiment of a waste dryer according to the present invention, in which FIG. 1A is a schematic view of the whole, and FIG. 1B is a view taken in the direction of arrows AA in FIG.
FIG. 2 is a flowchart showing an example of a method for converting municipal waste into solid fuel.
FIGS. 3A and 3B show an example of a conventional kiln-type waste dryer, in which FIG. 3A is a schematic view of the whole, and FIG. 3B is a view taken in the direction of arrows BB in FIG.
[Explanation of symbols]
1 Drum 6 Warm Air 7 Warm Air Blowing Duct 8 Blowing Nozzle 10 Garbage 11 Garbage Accumulation Cover 12 Watering Nozzle Tube
17 Watering nozzle 18 Watering pipe 19 Watering nozzle 20 Watering pipe 21 Air cooling jacket 22 Watering nozzle 23 Watering pipe

Claims (2)

A water spray nozzle tube is provided so that water can be sprinkled into the waste supply side and the waste discharge side with one end side of the drum horizontally placed and rotated as the waste supply side and the other end side as a waste discharge side. The hot air blowing duct having a large number of blowing nozzles in the longitudinal direction is inserted and fixed in the drum, and the hot air blown into the drum through each blowing nozzle from the hot air blowing duct In a garbage dryer designed to dry garbage, a dust accumulation prevention cover is formed on the upper part of the hot air blowing duct located in the drum over the entire length, with an upper part formed in a mountain shape and an air cooling jacket inside. provided with, on one or both of the upper and lower positions within the drum, a water spray tube having a plurality of water spray nozzles in the longitudinal direction, and arranged in the axial direction of the drum, the dust deposited diverging water tube Garbage dryer characterized by comprising by fixedly supported on sealing cover. The warm-air blow write duct, dust drying machine according to claim 1 Symbol placement is disposed by inserting a sprinkling pipe having a plurality of water spray nozzles in the longitudinal direction.

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