JP4745285B2 - Waste plastic treatment facility and method for reducing humidity of exhaust gas using the same - Google Patents

Description

  The present invention relates to waste plastic processing equipment and a method for deodorizing exhaust gas using the same. Specifically, the present invention relates to a waste plastic processing facility having a deodorizing device for deodorizing vapor-containing odor gas generated from a molding device for reducing and molding waste plastic, and a method for deodorizing exhaust gas using the same.

  In recent years, the number of waste plastics discarded as industrial waste or general waste has been increasing. On the other hand, as a major theme for environmental conservation on a global scale, there is a growing demand for carbon dioxide reduction, and instead of processing waste plastics by conventional simple disposal or landfilling, we are working on recycling as raw materials or heat sources. Is increasing. In particular, while the current waste plastics are mixed with many types of plastics, thermal recycling is attracting attention from the viewpoint of processing costs, and in many industrial furnaces, practical application or research into practical use of thermal recycling of waste plastics has been made. Various waste plastic treatment facilities have been proposed.

  For example, regarding a waste plastic molding apparatus, Japanese Patent Application Laid-Open No. 11-348038 (Patent Document 1 below) discloses that a cutting resistance when cutting a discharged material is small, and even if a change in the state of the discharged material occurs, A cutting device for volume reduction molding of waste plastic is described in which the discharged rod-shaped plastic does not stick to the cutting blade or cannot be cut, and stable cutting is maintained even in continuous cutting. .

  Regarding the exhaust gas treatment method for waste plastic treatment equipment, Japanese Patent Application Laid-Open No. 61-11521 (Patent Document 2 below) discloses a method for drastically reducing municipal solid waste containing plastic or solid waste from nuclear power plants. An exhaust gas treatment method that does not require extra incidental equipment has been proposed by using the exhaust gas generated in the above for cooling the cooling medium of the induction heating coil that heats the external heating unit.

  However, in equipment that recycles waste plastic discharged from municipalities as a raw material for coke by the Containers and Packaging Recycling Law, there is a problem that high-humidity odor gas containing steam and mist is generated from the molding equipment that reduces and forms waste plastic. There was a point.

In conventional equipment, the humidity of the dust collection air collected directly from the molding machine system is high, so the filter cloth in the dust collector is in a wet state. In addition, since the air flowing to the latter stage of the dust collector is in a high humidity atmosphere and contains mist, the ability of the deodorizing device has not been sufficiently exhibited by moisture.
Japanese Patent Laid-Open No. 11-348038 JP 61-11521 A

  Therefore, an object of the present invention is to provide a waste plastic treatment facility that improves the deodorization performance by reducing the humidity of the dust collection gas discharged from the molding apparatus, and a method for deodorizing the exhaust gas using the same.

As a result of intensive investigations to solve the above-mentioned problems, the present invention draws air outside the apparatus into the exhaust duct of the steam-containing odor gas generated from the molding apparatus, drains the steam by cooling, and collects the exhaust from the molding apparatus. The present invention provides a waste plastic treatment facility that improves deodorization performance by reducing the humidity of dust gas and a method for deodorizing exhaust gas using the same, and the gist of the facility is as described in the claims. The contents are as follows.
(1) In a waste plastic processing facility having a dust collector that collects steam and mist-containing odor gas generated from a molding device that reduces and molds waste plastic, an exhaust duct is provided at the outlet of the waste plastic molding device. By providing a suction port for sucking air into the duct, the steam and mist-containing odor gas are cooled to drain the steam, and the drain is provided by a drain pan provided at the air suction port, and the exhaust duct is connected. A waste plastic processing facility characterized in that a header is an inclined header, drainage is provided at a lowermost portion of the inclined header, and the drainage of the drain reduces the humidity and mist of odor gas generated from the molding apparatus. (2) The waste plastic processing facility according to (1), wherein the inclined header is a vertical header, and drainage is provided at a lower portion of the vertical header.
(3) A dust collector having a water-repellent filter cloth at the rear stage of the inclined header, and a mist contained in the odor gas by colliding the odor gas discharged from the molding apparatus with the rear stage of the dust collector (1) The waste plastic processing facility according to (1), further comprising a filter for removing water and a mixing duct for mixing and diluting the odor gas discharged from the molding apparatus and other low-humidity gas.
(4) A dust collector having a water repellent filter cloth at the rear stage of the vertical header, and a mist contained in the odor gas by colliding the odor gas discharged from the molding apparatus with the rear stage of the dust collector. (2) The waste plastic processing facility according to (2), further comprising: a filter for removing water, and a mixing duct for mixing and diluting odor gas discharged from the molding apparatus and other low-humidity gas.
(5) The waste plastic processing facility according to (3) or (4) , further comprising a heater that heats the mixed and diluted gas at an outlet of an exhaust blower provided at a subsequent stage of the mixing duct.
(6) A method for deodorizing exhaust gas in the waste plastic processing facility according to any one of (1) to (5), wherein suction is provided in an exhaust duct provided at an outlet of a waste plastic molding apparatus. The steam-containing odor gas is cooled by sucking air from the mouth to drain the steam, and the drain is discharged by a drain pan provided at the air suction mouth, and the drain is discharged by an inclined header connected to the exhaust duct. A method for deodorizing exhaust gas in a waste plastic disposal facility characterized by discharging.
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According to the invention of (1), steam and mist-containing odor gas are cooled by sucking air by providing an exhaust duct at the outlet of the machine body of the waste plastic molding apparatus and sucking air into the duct. Steam is drained, and the header connected to the exhaust duct is an inclined header, and drainage is provided at the lowermost part of the inclined header to discharge the drain, thereby reducing moisture brought into the dust collector and flowing to the subsequent stage. The humidity of the odor gas generated from the molding apparatus can be reduced.
According to the invention of (2), when the inclined header is a vertical header, and drain is provided at the lower part of the vertical header, the drain generated without the header by the vertical header is collected at the lower part of the header, It is possible to reduce moisture brought into the dust collector from the drain drain provided, and to reduce the humidity of the odor gas generated from the molding apparatus that flows to the subsequent stage.
According to the invention of (3), the mist contained in the odor gas by colliding the dust collector having the filter cloth subjected to the water splashing process and the odor gas discharged from the molding device at the subsequent stage of the inclined header. Since the filter to be removed, the odor gas discharged from the molding apparatus and the other low-humidity gas are mixed and diluted, the humidity of the odor gas discharged from the molding apparatus can be reduced. According to the invention of (4), the dust collector having a water-repellent filter cloth is provided at the rear stage of the vertical header, and the odor gas discharged from the molding device is caused to collide with the rear stage of the dust collector. Because the filter that removes mist contained in odor gas and the odor gas discharged from the molding device and other low-humidity gas are mixed and diluted, the humidity of the odor gas discharged from the molding device is reduced. can do.
According to the invention of (5), since the heater for heating the mixed and diluted gas is provided at the outlet of the exhaust blower provided at the subsequent stage of the mixing duct, the humidity is lowered by the heater even if the mixed and diluted gas is high in humidity. it can.
According to the invention of (6), the odor gas containing steam is cooled by draining the steam by sucking air from the suction port provided in the exhaust duct provided at the outlet of the waste plastic molding device, The drain is discharged by a drain pan provided in the air suction port, and the drain is also discharged from an inclined header or a vertical header connected to the exhaust duct, thereby reducing the humidity of the odor gas generated from the molding apparatus. The deodorizing performance of the apparatus can be improved.

  According to the present invention, it is possible to provide a waste plastic processing facility that improves the deodorization performance by reducing the humidity of the dust collection gas discharged from the molding apparatus, and a method for deodorizing the exhaust gas using the same. There are significant effects that are useful.

  The best mode for carrying out the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a diagram illustrating an embodiment of a waste plastic processing facility of the present invention. FIG. 2 shows another embodiment.

The present inventors have found the following problems as a result of studying a waste plastic processing facility having a conventional deodorizing apparatus.
・ The steam generated from the molding device drained and moisture was brought into the dust collector.
・ Technical problem that the filter cloth of the dust collector becomes wet, the moisture adhering to the filter cloth flows backward with air of “mist + high humidity”, the mist adheres to the deodorizer and becomes high humidity, and the deodorizing performance is not exhibited. was there.
・ In order to demonstrate the deodorizing performance of the deodorizer, humidity of 80% or less is desirable.

As a result of intensive studies, the present inventors have found that the following method is effective for reducing the humidity of the dust collection gas.
1) Steam and mist-containing odor gas are rapidly cooled by sucking air together with the exhaust gas from the molding apparatus, and drained and recovered at the initial stage of suction. This reduces the amount of moisture brought into the wake (dust collector).
2) Drain water in the duct is discharged by the inclined duct to prevent plastic powder and fluff from accumulating in the duct, and to reduce the moisture brought into the downstream (dust collector).
3) Applying water repellency such as glass coating or Teflon (registered trademark) impregnation to the filter cloth used in the dust collector, the water on the filter cloth surface is actively dropped, preventing the wet condition of the filter cloth, Reduce the amount of water brought into the (deodorizing device).
4) By providing a filter that removes the mist contained in the odor gas by colliding the mist in the odor gas scattered in the latter stage of the dust collector, the mist is prevented from flying in the latter stage equipment.
5) Reduce the humidity by mixing and diluting the low-humidity air with the high-humidity air that has passed through the filter.
6) Reduce the humidity by providing a heater to heat the mixed and diluted gas at the outlet of the exhaust blower.

  A preferred embodiment of the present invention will be described with reference to FIG.

  In FIG. 1, 1 is a molding device, 2 is an exhaust duct, 3 is an intake port, 4 is an exhaust duct, 5 is an intake port, 6 is an intake port, 7 and 8 are intake ducts, 9 is a drain pipe, and 10 is an inclined header , 11 is a drain pipe, 12 is a molding apparatus dust collector, 13 is a filter, 14 is a molding apparatus duct, 15 is a mixing duct, 16 is an exhaust blower, 17 is a heater, 18 is a deodorizing device, 19 is an exhaust duct, and 20 is Constant supply device, 21 is constant supply conveyor, 22 is supply device, 23 is supply conveyor, 24 is hood, 25 is intake duct, 26 is hood, 27 is intake duct, 28 is intake header, 29 is dust collector, 30 is collector A dust duct 31 indicates a drain pot.

  First, waste plastics discharged from local governments are sorted by a wind sorter (not shown) and are divided into a normal temperature and normal humidity wind / dust system shown by the dotted line in FIG. 1 and a high humidity molding machine system shown by the solid line. It is done.

  The low-humidity wind dust exhaust gas is taken in by the hoods 24 and 26 and supplied to the dust collector 29 via the intake duct 27 and the intake header 28 to remove dust, and then to the mixing duct 15 via the dust collection duct 30 And merge with the molding machine system.

  Waste plastic from the high-humidity molding apparatus system is supplied to the molding apparatus 1 via the supply conveyor 23, the supply apparatus 22, the fixed supply conveyor 21, and the fixed supply apparatus 20, and is reduced in volume and molded into a plastic molded product. Since this waste plastic has high humidity and is heated to about 100 ° C., the exhaust gas of the molding apparatus is an odor gas containing steam and mist.

  Therefore, in the present invention, the odor gas exhaust ducts 2 and 4 exhausted from the molding apparatus are provided with suction ports 3 and 5 for sucking air, and the odor gas is rapidly cooled to room temperature by mixing outside air into the odor gas. Thus, by causing the dew condensation phenomenon, the vapor in the odor gas can be drained. In this equipment, there are two suction ports 3 and 5 for sucking air, but it is also possible to have one air suction port depending on the amount of steam generated.

  Further, by introducing the odor gas discharged from the molding apparatus into the inclined header 10 where the exhaust duct headers 4, 7, 81 are inclined by about 10 to 20 degrees, the drain flows into the drain pipe 9 by gravity, and the drain pot 31 Therefore, the humidity of the odor gas discharged from the molding apparatus can be reduced.

  The odor gas with reduced humidity is removed by the molding machine dust collector 12, and then the filter 13 collides with the odor gas discharged from the molding apparatus to remove water droplets contained in the odor gas. .

  In the present invention, the type of filter cloth used in the dust collector 13 is not limited. For example, by using a filter cloth that has been subjected to water-repellent processing such as glass coating or Teflon (registered trademark), it is possible to collect from the exhaust gas having high humidity. The dust effect can be enhanced.

  Further, as shown in FIG. 1, by providing a mixing duct 15 for mixing and diluting the odor gas discharged from the molding apparatus and the low-humidity gas of the wind dust system discharged from the previous stage of the molding apparatus, Humidity can be reduced.

  Further, by providing a heater 17 that further heats the mixed and diluted gas at the outlet of the exhaust blower 19 provided at the rear stage of the mixing duct 18, the humidity of the odor gas can be reduced. After that, it can be discharged as odorless gas through the exhaust duct 19.

  In the embodiment of FIG. 1, the mixing duct 15 and the filter 13 are provided at the subsequent stage of the molding machine dust collector 12, but the exhaust gas can be obtained by providing the mixing duct 15 and the filter 13 at the preceding stage of the molding machine dust collector 12. Therefore, it is not necessary to provide a separate dust collector according to the humidity, and the equipment can be simplified and the equipment cost can be reduced. Fig. 2 shows the arrangement of the heater 17 on the exit side of the wind and dust dust collector. The humidity of the mixed gas is reduced by heating the wind and dust gas and mixing it with the molding machine gas. And the capacity of the heater can be greatly reduced. FIG. 3 shows a vertical header instead of the inclined header.

When the waste plastic treatment facility of the present invention shown in FIG. 1 was confirmed by a 20-day test, the deodorizing performance can be exhibited by reducing the humidity of the dust collection air as described below according to the present invention. The effect of was confirmed.
・ Planned value: Dehumidifier input side humidity 70% or less at outside air humidity 79% ・ Actual value: Deodorizer input side humidity 30-40% at outside air humidity 50%

It is a figure which illustrates embodiment of the waste plastic processing equipment of this invention. It is a figure which illustrates embodiment of this invention which has arrange | positioned the heater in the exit side of a wind-power / dust type dust collector. It is a figure which illustrates embodiment of this invention made into the vertical header instead of the inclination header.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Exhaust duct 3 Suction port 4 Exhaust duct 5 Suction buro 6 Hood 7 Intake duct 8 Intake duct 9 Drain pipe 10 Inclined header 11 Drain pipe 12 Molding machine dust collector 13 Filter 14 Molding machine duct 15 Mixing duct 16 Exhaust blower 17 Heater 18 Deodorizing device 19 Exhaust duct 20 Fixed supply device 21 Fixed supply conveyor 22 Supply device 23 Supply conveyor 24 Hood 25 Intake duct 26 Hood 27 Intake duct 28 Intake header 29 Wind / dust dust collector 30 Wind / dust dust collector duct 31 Drain 32 vertical header

Claims (6)

  In a waste plastic processing facility having a dust collector that collects steam and mist-containing odorous gas generated from a molding device that reduces and molds waste plastic, an exhaust duct is provided at the outlet of the waste plastic molding device, and the duct By providing a suction port for sucking in air, the steam and mist-containing odor gas are cooled to drain the steam, and the drain pan is provided in the air suction port, and the drain connected to the exhaust duct is inclined. A waste plastic processing facility characterized in that a drain is provided at a lowermost part of the inclined header, and the humidity and mist of odorous gas generated from the molding apparatus is reduced by discharging the drain.   The waste plastic processing facility according to claim 1, wherein the inclined header is a vertical header, and drainage is provided at a lower portion of the vertical header.   A dust collector having a water-repellent filter cloth is provided at the rear stage of the inclined header, and the odor gas discharged from the molding apparatus is collided with the rear stage of the dust collector to remove mist contained in the odor gas. The waste plastic processing facility according to claim 1, further comprising a filter and a mixing duct for mixing and diluting the odor gas discharged from the molding apparatus and another low-humidity gas.   A dust collector having a water-repellent filter cloth at the rear stage of the vertical header and an odor gas discharged from the molding apparatus are collided with the rear stage of the dust collector to remove mist contained in the odor gas. The waste plastic processing facility according to claim 2, further comprising a filter and a mixing duct for mixing and diluting the odor gas discharged from the molding apparatus and another low-humidity gas. 5. The waste plastic processing facility according to claim 3 , further comprising a heater that heats the mixed and diluted gas at an outlet of an exhaust blower provided at a rear stage of the mixing duct.   A method for reducing the humidity of exhaust gas in the waste plastic processing facility according to any one of claims 1 to 5, wherein the exhaust gas humidity is reduced from a suction port provided in an exhaust duct provided at an outlet of a waste plastic molding apparatus. The steam-containing odor gas is cooled by sucking air to drain the steam, and the drain is discharged by a drain pan provided at the air suction port, and the drain is discharged by an inclined header connected to the exhaust duct. A method for reducing the humidity of exhaust gas in a waste plastic processing facility.

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