JP4331647B2 - Waste dryer and waste treatment equipment - Google Patents

Description

  The present invention relates to a waste dryer for drying combustible waste such as municipal waste, and particularly, a waste dryer suitable for use in a waste drying process such as when combustible waste is converted into a solid fuel, and waste using the waste dryer. The present invention relates to a processing apparatus.

Conventionally, as an example of this kind of garbage dryer, there is a ventilating rotary dryer disclosed in Patent Document 1. The aeration-type rotary drying apparatus draws a hot air blowing duct into a rotating cylinder in a direction parallel to the axis of the cylinder, and a number of branch pipes are arranged in the hot air blowing duct at a small interval in order. A drying device having an end opened near the center of the in-tube material holding portion during rotation of the rotating cylinder, and provided with an annular chamber that communicates the central portion with the rotating cylinder outside the material feeding portion An end box is provided at the outlet of the rotary cylinder, an exhaust port is provided at one end of the annular chamber, and an exhaust port is also provided in the end box. However, in the ventilating rotary drying device having such a configuration, there is a problem that dust accumulates in the hot air blowing duct, and particularly, string, vinyl, etc. tend to get entangled and adhere. This accumulated waste becomes a factor that requires extra heat load, and the accumulated waste itself becomes overdried and there is a risk of ignition, so it is necessary to remove it periodically before it becomes dangerous There was a problem that there was.
JP-A-61-285379

  The present invention has been made in view of the above points, and in a cylindrical rotary type dryer, it is possible to suppress the trapping and accumulation of dust on the upper part of the hot air blowing duct (hot air main pipe), and to achieve a stable operation state. It is an object of the present invention to provide a waste dryer that can be established and a waste treatment apparatus using the waste dryer.

In order to solve the above-mentioned problems, the invention described in claim 1 is a rotationally driven drum having one end on the waste supply side and the other end on the waste discharge side, and an axially inserted and disposed in the drum. A hot-air blowing duct having a plurality of hot-air blowing nozzles for blowing wind, and drying the waste thrown into the drum from the hot-air blowing duct through the hot-air blowing nozzle into the drum. In the waste dryer, a dust accumulation prevention cover having a predetermined width and a substantially arc-shaped convex curved upper surface is provided on the upper part of the hot air blowing duct in the drum. An air cooling jacket is provided inside, and a hook lifter and a scraping lifter are provided on the inner peripheral surface of the drum to suppress the accumulation of dust on the upper part of the dust accumulation prevention cover .

  According to a second aspect of the present invention, in the garbage dryer according to the first aspect, a water spray pipe having a plurality of water spray nozzles for spraying water in the drum is provided in the drum.

  According to a third aspect of the present invention, in the waste dryer according to the first or second aspect, the width dimension of the dust accumulation prevention cover is two to five times the length of the vinyl or string-like substance contained in the garbage. It is characterized as follows.

  The invention described in claim 4 is a waste treatment apparatus such as a solid fuel facility, an incinerator, a stoker furnace, a gasification melting furnace, a waste supply apparatus, etc., as a dryer for drying waste handled by the waste treatment apparatus. The waste dryer according to Item 1 or 2 or 3 is used.

According to the first aspect of the present invention, the dust accumulation prevention cover having a predetermined width is provided on the upper surface of the hot air blowing duct in the drum over the entire length. The string in the garbage thrown into the drum and the vinyls get entangled and tied together, and the thing that has grown long (long material) rides on the upper part of the hot air blowing duct, and the dust adheres to the vinyl, grows and accumulates The following effects can be expected.
(1) It is possible to prevent the phenomenon that the upper part of the hot air blowing duct is crushed and dented due to the accumulated dust.
(2) It is possible to prevent ignition due to excessive drying of accumulated garbage.
(3) Excessive drying with respect to accumulated waste is eliminated, and the heat load can be reduced.
(4) Since the air cooling jacket is provided inside the dust accumulation prevention cover, it is possible to prevent the accumulation of garbage.
In addition, since the hook lifter and scraper lifter are provided on the inner peripheral surface of the drum to prevent the accumulation of dust on the upper part of the dust deposition prevention cover, the upper part of the dust deposition prevention cover is provided by the hook lifter and scraper lifter. Scrub off the dust and dirt that got on the car.

  According to the second aspect of the present invention, since the water spray pipe having a plurality of water spray nozzles for spraying water in the drum is provided in the drum, it is possible to prevent overdrying and to adjust the temperature in the drum. You can avoid danger.

  According to the third aspect of the present invention, the width of the dust accumulation prevention cover is set to be not less than 2 times and not more than 5 times the length of the vinyl or string-like substance contained in the dust. It is possible to prevent a phenomenon in which things that have been tangled and grown long (long objects) get entangled with the dust accumulation prevention cover.

  According to the invention described in claim 4, since the waste dryer according to claim 1, 2 or 3 is used as the dryer of the waste treatment apparatus, the operation of the dryer is periodically stopped and hot air blowing is performed. Since it is not necessary to remove the dust accumulated on the upper part of the duct or the number of times can be reduced, the operating rate of the waste treatment apparatus can be improved.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a garbage dryer according to the present invention (a cross-sectional view taken along the line AA in FIG. 2), and FIG. 2 is a cross-sectional view taken along the line BB in FIG. The garbage dryer 10 includes a drum 11 that is rotationally driven, one end of which is a garbage supply side and the other end of which is a garbage discharge side. The drum 11 is axially inserted into the drum 11 and blows warm air into the drum 11. A hot air blowing duct 12 having a plurality of hot air blowing nozzles 16 is provided. The hot air blowing duct 12 is partitioned by a partition plate 13, one being a high temperature hot air blowing duct 12a and the other being a low temperature hot air blowing duct 12b. A high temperature hot air inlet 14 is provided at the end of the high temperature hot air blowing duct 12a, and a low temperature hot air inlet 15 is provided at the end of the low temperature hot air blowing duct 12b.

The high temperature hot air blowing duct 12a and the low temperature hot air blowing duct 12b are provided with a plurality of hot air blowing nozzles 16 as described above. The hot air blowing duct 12 and the hot air blowing nozzle 16 are covered with a heat insulating material layer 17 such as glass wool, and the tip of the hot air blowing nozzle 16 opens into the drum 11. An air cooling jacket 18 passes through an upper portion in the heat insulating material layer 17 covering the hot air blowing duct 12. A dust accumulation prevention cover 19 is provided on the heat insulating material layer 17. The dust deposition preventive cover 19 is provided on the upper portion of the heat insulating material layer 17 over the entire length of the warm-air blow write duct 12, the upper surface is substantially arcuate convex curved surface having a predetermined width L _0. Further, the dust accumulation preventing cover 19 is also made of a heat insulating material like the heat insulating material layer 17.

  A plurality of hook lifters 20 and scraping lifters 21 are provided on the inner peripheral surface of the drum 11. One end of the drum 11 is provided with a dust supply device 22 for supplying dust into the drum 11, and the other end is provided with a discharge port 25 for discharging dried waste and an exhaust port 26 for discharging exhaust gas. ing. Further, a watering pipe 24 having a plurality of watering nozzles 23 is provided below the heat insulating material layer 17 covering the hot air blowing duct 12 in the drum 11.

  FIG. 3 is a flow sheet of a waste drying process using the waste dryer 10 having the above configuration. Garbage crushed to a predetermined size in the previous process is quantitatively supplied to a waste supply device 22 from a hopper (not shown), and the waste supply device 22 supplies the waste to the inner peripheral surface of one end of the drum 11. To do. The supplied dust advances toward the discharge port 25 while swinging the inner peripheral surface of the drum 11. During this time, high-temperature hot air (from the high-temperature hot air blowing duct 12a) and low-temperature hot air (from the low-temperature hot air blowing duct 12b) are blown from the hot-air blowing nozzle 16 to the garbage (see FIG. 2). Is dried to a predetermined moisture content (for example, 10 to 20% WB) and discharged from the discharge port 25 to the conveyor 27.

  Fuel 29 such as kerosene and combustion air from the combustion air fan 30 are supplied to the heat source furnace 28, and high temperature hot air 31 of 200 ° C. to 400 ° C. generated by combustion of the fuel 29 passes through the high temperature hot air inlet 14. The hot air blowing duct 12 is introduced into the hot air blowing duct 12a and is blown from the hot air blowing nozzle 16 to the dust layer 32 in the drum 11 (see FIG. 2). The exhaust gas 33 exhausted from the exhaust port 26 of the garbage dryer 10 is guided to exhaust cyclones 34 and 35. The dust 36 from the exhaust cyclones 34 and 35 is sent to the subsequent process together with the dry waste from the conveyor 27. A part of the low temperature hot air 37 discharged from the exhaust cyclone 34 is introduced into the heat source furnace 28 by the circulation fan 38, and a part of the low temperature hot air 37 passes through the low temperature hot air inlet 15 of the dust dryer. Is introduced into the low temperature hot air blowing duct 12b. The low temperature hot air 37 introduced into the low temperature hot air blowing duct 12 b is blown from the hot air blowing nozzle 16 to the dust layer 32 in the drum 11.

  Exhaust gas 39 discharged from the cyclone 35 is guided to a deodorizing furnace through a fan (not shown). In addition, the atmosphere 40 is introduced into the air cooling jacket 18 of the dust dryer 10 by the combustion air fan 30, and the heat insulating material layer 17 covering the hot air blowing duct 12 is air cooled and then introduced into the heat source furnace 28.

As described above, the dust accumulation prevention cover 19 having a predetermined arcuate curved surface and having a predetermined width L ₀ is provided on the top of the heat insulating material layer 17 covering the hot air blowing duct 12, and the rotation direction (FIG. The length is extended both forward and backward in the direction of arrow C in FIG. Furthermore, the front is attached to the wall of the heat insulating material layer 17 covering the hot air blowing duct 12 in a shape orthogonal to the horizontal direction, and the rear side covers the hot air blowing duct 12 in a shape parallel to the horizontal plane. It is installed in the heat insulating material layer 17. That is, the dust accumulation prevention cover 19 has a predetermined width L ₀ in the rotation direction of the drum 11 over the entire upper length of the heat insulating material layer 17 covering the hot air blowing duct 12. The upper part of 19 does not get caught or entangled with long items in the garbage.

  Furthermore, a hooking lifter 20 and a scraping lifter 21 provided on the inner peripheral surface of the drum 11 are effectively arranged so that dust and dusts on the upper part of the dust accumulation prevention cover 19 are scraped off. In addition, the front side and the rear side of the dust accumulation prevention cover 19 are configured as described above, thereby reducing the chance of dust getting on the upper portion of the dust accumulation prevention cover 19 and preventing the accumulation on the inclined portion. Yes. In this way, by adopting a structure in which the upper part of the heat insulating material layer 17 covering the hot air blowing duct 12 is covered with the dust accumulation preventing cover 19 and no dust is accumulated on the dust accumulation preventing cover 19, excess dust accumulated is adopted. While preventing drying and avoiding the risk of ignition, it is possible to suppress excessive drying of the accumulated garbage and reduce the heat load.

  Further, since the above-mentioned dryer is provided with the watering pipe 24 having the plurality of watering nozzles 23, it is possible to prevent overdrying of the dust or to adjust the temperature in the drum 11 to avoid the risk of ignition. Easy to do.

As described above, a dust accumulation prevention cover 19 is provided on the top of the heat insulating material layer 17 covering the hot air blowing duct 12, and the lengths of the strings and vinyls in the supplied garbage are assumed to be L ₁ , L ₂ . The width L ₀ of the deposition prevention cover 19 needs to have a dimension of L ₀ ≧ L ₁ + L ₂ +. In this embodiment, since there are a lot of long objects with a shape of about 1000 mm due to the fact that two or three strings of vinyl of about 300 mm in the supplied garbage are in close contact with each other, and L ₀ = 1000 mm, waste accumulation prevention Good results were obtained in which there was no long object on top of the cover 19 for use. As a determination criterion, it is assumed that there is no long object on top of the dust accumulation prevention cover 19 during the operation time of the facility for one day. The width of the dust accumulation prevention cover is effective if it is at least twice as long as the length of the string or vinyl. If the cover does not interfere with the function of the drum and there is no upper limit, it should be about 5 times. preferable.

  In this example, comparison was made between the conventional example and the present invention after 16 hours of operation. In the conventional example, the upper part of the heat insulating material covering the hot air main pipe of the dryer has a sharp mountain shape, whereas in the dryer according to the present invention, the heat insulating material layer covering the hot air blowing duct 12 as shown in FIG. In this configuration, a dust accumulation prevention cover 19 is provided on the upper portion of 17. In the conventional example, a large amount of dust was placed on the upper portion of the heat insulating material covering the hot air main pipe, whereas in the dryer of the present invention, no dust was placed on the upper portion of the dust accumulation prevention cover 19.

  As described above, the dust dryer 10 according to the present invention can reduce the amount of dust riding on the upper part of the dust accumulation prevention cover 19 by providing the dust accumulation prevention cover 19. Not only can the operation of the machine be stopped and the number of operations to remove the dust accumulated on the top of the heat insulating material covering the hot air main pipe not only be greatly reduced, but also the waste dryer 10 according to the present invention can be replaced with, for example, a solid fuel facility, In the incinerators, stoker furnaces, gasification and melting furnaces, waste supply equipment, etc., the utilization rate of such waste treatment equipment is greatly improved by using it as a dryer to dry the waste handled by the waste treatment equipment. Can be made.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is a figure (the AA cross-sectional arrow figure of FIG. 2) which shows the structure of the waste dryer which concerns on this invention. It is a BB cross-sectional arrow view of FIG. It is a figure which shows the flow sheet of the waste drying process using the waste dryer which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Waste dryer 11 Drum 12 Hot air blowing duct 13 Partition plate 14 High temperature hot air inlet 15 Low temperature hot air inlet 16 Hot air blowing nozzle 17 Heat insulating material layer 18 Air cooling jacket 19 Dust accumulation prevention cover 20 Hook lifter 21 Scraping lifter 22 Waste supply device 23 Sprinkling nozzle 24 Sprinkling pipe 25 Discharge port 26 Exhaust port 27 Conveyor 28 Heat source furnace 29 Fuel 30 Combustion air fan 31 High temperature hot air 32 Waste layer 33 Exhaust gas 34 Exhaust cyclone 35 Exhaust cyclone 36 Dust 37 Low temperature hot air 38 Circulation fan 39 exhaust

Claims (4)

A hot air blower having a drum that is rotationally driven with one end being a waste supply side and the other end being a waste discharge side, and a plurality of hot air blow nozzles that are axially inserted into the drum and blow hot air into the drum A waste dryer for drying waste thrown into the drum by hot air blown into the drum from the hot air blow duct through the hot air blow nozzle,
A dust accumulation preventing cover having a predetermined width is provided on the upper surface of the drum over the entire length of the hot air blowing duct, and an air cooling jacket is provided inside the dust accumulation preventing cover. Provided ,
A garbage dryer, characterized in that a hook lifter and a scraper lifter are provided on the inner peripheral surface of the drum to suppress the accumulation of dust on the upper part of the dust accumulation prevention cover . In the garbage dryer of Claim 1,
A dust dryer having a watering pipe having a plurality of watering nozzles for watering in the drum. In the refuse dryer according to claim 1 or 2,
A dust dryer according to claim 1, wherein a width of the dust accumulation prevention cover is set to be not less than 2 times and not more than 5 times the length of the vinyl or string-like substance contained in the dust. In waste treatment equipment such as solid fuel facilities, incinerators, stoker furnaces, gasification melting furnaces, waste supply equipment, etc.
4. A waste treatment apparatus using the waste dryer according to claim 1, 2 or 3, as a dryer for drying the waste handled by the waste treatment apparatus.

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