JPH0692088B2 - Disposal processing equipment for medical waste plastic - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a melting treatment apparatus for waste plastics for medical use which very efficiently treats wastes made of synthetic resin generated in medical institutions such as used synthetic resin syringes and chemical containers made of synthetic resin. It is about.

[0002]

2. Description of the Related Art A large amount of waste (hereinafter simply referred to as waste plastic) such as used synthetic resin syringes and synthetic resin chemical containers is produced from medical institutions depending on the scale.
Conventionally, the processing of these waste plastics has been outsourced to a specialized processing company, and the contractor in practice actually separates these waste plastics from general industrial waste and incinerates them.

[0003]

As described above, conventionally, most of the waste plastics have been disposed of by incineration by a professional processor. However, unlike ordinary waste plastics, waste plastics have a complex mixture of blood, various chemicals, solutions, etc. There is a problem that odorous gas generated from waste plastics harms the surrounding environment in simple incineration. . In addition, compared to the amount of waste plastic generated from medical institutions, the processing capacity of specialized processors is low, and it takes time to collect, so there was a problem that waste plastic had to be managed during that period. . Further, even when the treatment is performed by a medical institution, odorous gas is naturally generated during the treatment, which causes a problem of harming the environment.

Therefore, the present invention is a modification of the conventional simple incineration process, in which the waste plastic is melted in the melting furnace with hot air at 200 ° C. to 300 ° C., and the odorous gas generated during this melting process is introduced into the deodorizing furnace. 700 ° C to 1000 ° C in the deodorizing furnace
The odorous gas is thermally decomposed at a high temperature to deodorize it, and thermal energy is circulated between the deodorizing furnace and the melting furnace so that the waste plastic can be treated very efficiently, and the melted waste plastic is recycled. It is an object of the present invention to provide a melt processing apparatus for medical waste plastic that can be used.

[0005]

Means for Solving the Problems To elaborate the constitution of the present invention for achieving the above object, the invention according to claim 1 is
A smelting furnace for waste plastic, which has a jacket that serves as a passage for exhaust hot air on the outer periphery, an exhaust tube that communicates with the jacket of this smelting furnace, and a jacket that serves as a heat exchange chamber on the outer periphery. A heat exchange type deodorizing furnace, a burner for supplying high heat to the deodorizing furnace, an exhaust gas duct for guiding exhaust heat in the deodorizing furnace to the jacket of the melting furnace, and a high temperature in the jacket of the deodorizing furnace. A circulating gas duct that guides hot air into the melting furnace, an odor gas suction duct that guides the odorous gas generated when waste plastic is melted in the melting furnace into the deodorizing furnace and the jacket of the deodorizing furnace, and this odorous gas A melting treatment device for medical waste plastics, characterized by comprising an induction fan attached in the duct of the suction duct, and the invention according to claim 2 is the stirring driven by a motor to rotate in the melting furnace. Feather Claim 1, characterized in that annexed
It is the melting processing apparatus of the medical waste plastic described. Furthermore, the invention according to claim 3 is characterized in that an annular hot-air blowing pipe having hot-air blowing holes is provided in the melting furnace, and the tip of the circulating gas duct is connected to the hot-air blowing pipe. The melting treatment apparatus for a medical waste plastic according to claim 1 or 2.

According to the apparatus of the present invention, the odorous gas generated in the melting furnace is introduced into the deodorizing furnace through the odorous gas suction duct, and is deodorized by thermal decomposition in the deodorizing furnace at a high temperature of about 800 ° C. Therefore, even if it is released from the exhaust stack to the atmosphere, there is no danger of damaging the environment. Further, the thermal energy in the deodorizing furnace is guided through the exhaust gas duct to the jacket attached to the outer peripheral portion of the melting furnace, which contributes to the temperature rise and heat retention of the melting furnace and the inner jacket attached to the outer peripheral portion of the deodorizing furnace. Since the hot air heated to the high temperature is supplied into the melting furnace through the circulating gas duct, there is almost no energy loss and the melting process is extremely efficient.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete construction of the medical waste plastic melting processing apparatus of the present invention will be described in detail below with reference to the illustrated embodiments. Figure 1
FIG. 3 is a schematic view showing an embodiment of the device of the present invention.

In the figure, 1 is a melting furnace having a waste plastic injection port 2 on one side thereof, and 3 is a jacket formed on the outer peripheral portion of the melting furnace 1 and serving as a passage for exhaust hot air. The bottom plate 4 of the melting furnace 1 is provided with a drop hole 5 for dropping the melted waste plastic downward, and a tray 6 for receiving the molten resin is prepared just below the drop hole 5. It should be noted that the jacket 3 is attached at an appropriate position on the top of the jacket 3.
An exhaust pipe 7 of the atmosphere open type is provided so as to communicate with the. Reference numeral 8 denotes a stirring blade that is driven to rotate by an electric motor 9 installed outside the melting furnace 1 so that the heat energy is evenly transmitted to the waste plastic put into the melting furnace 1 and the molten resin is dropped. It has the function of guiding in the direction of the hole 5.

Next, 10 is a heat exchange type deodorizing furnace for deodorizing the odorous gas generated when the waste plastic is melted in the melting furnace 1 at a high temperature, and 11 is provided on the outer peripheral portion of the deodorizing furnace 10. Shown jacket. Reference numeral 12 is a burner for supplying thermal energy into the deodorizing furnace 10, and 13 is a red hot deodorizing cylinder arranged in the deodorizing furnace 10. In addition, a large number of through holes 14 are formed in the peripheral surface of the red heat deodorizing cylinder 13 for passing the treated gas. Reference numeral 15 denotes an exhaust gas duct that guides exhaust heat in the deodorizing furnace 10 into the jacket 3 of the melting furnace 1, and 16 guides hot air heated to a high temperature in the jacket 11 at the outer peripheral portion of the deodorizing furnace 10 into the melting furnace 1. A circulating gas duct 17 is provided for deodorizing the odorous gas generated when the waste plastic is melted in the melting furnace 1 and a jacket 11 at the outer peripheral portion of the deodorizing furnace 10.
Each shows an odorous gas suction duct for guiding inside. An induction fan 18 is attached in the middle of the odorous gas suction duct 17, and the odorous gas generated in the melting furnace 1 by the rotational drive of the induction fan 18 is forced into the deodorizing furnace 10 and the jacket 11. Sent to.

In addition, reference numeral 19 in the drawing denotes the circulation gas duct 16 for the thermal energy in the jacket 11 at the outer peripheral portion of the deodorizing furnace 10.
When supplying into the melting furnace 1 through
To ensure that hot air is evenly distributed inside, melting furnace 1
It is an annular hot air blowing pipe arranged inside, and the tip of the circulating gas duct 16 is connected to the hot air blowing pipe 19. Further, 20 is from the melting furnace 1 to the deodorizing furnace 10
A gas amount adjusting damper 21, which is provided in the pipeline of the odorous gas suction duct 17 reaching inside, is provided in the pipeline of the odorous gas suction duct 17 which extends from the melting furnace 1 into the jacket 11 at the outer peripheral portion of the deodorizing furnace 10. It is a gas amount adjustment damper. Reference numeral 22 is a door body that is tightly attached to the waste plastic input port 2 in the melting furnace 1, and 23 is a rotation shaft that rotates the stirring blade 8.

Next, the operation of the apparatus of the present invention will be described. First, the door 22 is opened, the waste plastic to be melted is charged into the melting furnace 1 through the charging port 2, and the door 22 is closed. Next, the burner 12 is ignited, high heat energy is supplied into the deodorizing furnace 10 through the red heat deodorizing cylinder 13, and the induction fan 18 is driven to rotate. Then, the hot air in the deodorizing furnace 10 enters the jacket 3 on the outer peripheral portion of the melting furnace 1 through the exhaust gas duct 15 and raises the temperature in the melting furnace 1. At the same time, hot air heated to a high temperature inside the jacket 11 at the outer peripheral portion of the deodorizing furnace 10 is supplied into the melting furnace 1 through a circulating gas duct 16 from a hot air blowing pipe 19 arranged in the melting furnace 1. The inside of the melting furnace 1 is maintained at 200 ° C. to 300 ° C. suitable for melting the waste plastic by the hot air blown out from the hot air blowing pipe 19 and the exhaust hot air in the deodorizing furnace 10 passing through the jacket 3. Then, with the lapse of time, the waste plastic is melted and, while being guided by the stirring blade 8, falls into the tray 6 below through the drop hole 5 and is cooled by the atmosphere to be solidified and hardened.

On the other hand, the odorous gas generated by the melting of the waste plastic is attracted by the attracting fan 18 and guided through the odorous gas suction duct 17 into the red hot deodorizing cylinder 13 arranged in the deodorizing furnace 10. At the same time, a part of the odorous gas passes through the odorous gas suction duct 17 leading to the jacket 11 and enters the jacket 11 at the outer peripheral portion of the deodorizing furnace 10. Then, the odorous gas that has entered the red-hot deodorizing cylinder 13 is thermally decomposed and deodorized by the high heat energy of 700 ° C. to 1000 ° C. supplied from the burner 12. The deodorized treated gas passes through a through hole 14 formed in the red-hot deodorizing cylinder 13 to deodorize the furnace 1.
From 0, it enters the jacket 3 which is a passage for exhaust hot air from the exhaust gas duct 15, and becomes an odorless treated gas from the upper exhaust tube 7 and is diffused into the atmosphere. In addition, a part of the odorous gas that has entered the jacket 11 is circulated gas duct 1
It is again sent into the melting furnace 1 through 6 and circulated in the same manner as described above, and the odorous gas concentration gradually decreases in the process. For the sake of understanding, the flow of odorous gas is shown by the solid line arrow in the figure, and the flow of treated gas or combustion exhaust gas is shown by the dotted line arrow in the figure. As described above, according to the device of the present invention, the odorous gas remains untreated and is not blown from the exhaust stack, and the odorous gas passes through the circulation line formed by the odorous gas suction duct 17, the jacket 11 and the circulation gas duct 16. It is circulated repeatedly and, in the process, is subjected to deodorizing treatment in the deodorizing furnace 1.

[0013]

As described above, according to the apparatus of the present invention, the waste plastic can be melted with extremely high efficiency and with almost no heat loss, and no filter is used for deodorization. It is also very advantageous. In addition, since the odorous gas has a structure that circulates through the jacket of the melting furnace and the outer periphery of the deodorizing furnace through the circulation gas duct and the odorous gas suction duct, the untreated odorous gas is not released into the atmosphere and the environment It is possible to solve problems such as damage, and it is safe because dangerous substances such as injection needles are buried in the mass of melted waste plastic, and the obtained ingot of melt-hardened waste plastic is It can also be crushed into a recycled material. If the heat source is a gas or heavy oil burner,
It is possible to dispose of waste plastics at each medical institution unit without requiring a large amount of electric power and without affecting the operation of the medical institution.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a melting treatment apparatus for medical waste plastic according to the present invention.

[Explanation of symbols]

1: Melting furnace 2: Input port 3: Jacket 4: Bottom plate part 5: Drop hole 6: Tray 7: Exhaust tube 8: Stirring blade 9: Electric motor 10: Deodorizing furnace 11: Jacket 12: Burner 13: Red heat deodorizing tube 14: Through hole 15: Exhaust gas duct 16: Circulating gas duct 17: Odor gas suction duct 18: Induction fan 19: Hot air blowing pipe 20: Gas amount adjustment damper 21: Gas amount adjustment damper 22: Door

Claims (3)

[Claims] 1. A smelting furnace for waste plastic having an outer peripheral portion provided with a jacket serving as a passage for exhaust hot air, an exhaust pipe communicating with the jacket of the smelting furnace, and a jacket serving as a heat exchange chamber on the outer peripheral portion. A heat exchange type deodorizing furnace additionally provided, a burner for supplying high heat into the deodorizing furnace, an exhaust gas duct for guiding exhaust heat in the deodorizing furnace to the jacket of the melting furnace, and a jacket of the deodorizing furnace Circulating gas duct that guides hot air heated to the high temperature into the melting furnace, and odor gas suction duct that guides the odorous gas generated when waste plastic is melted in the melting furnace into the deodorizing furnace and the jacket of the deodorizing furnace. And a melting fan for a medical waste plastic, which is equipped with an induction fan attached in the conduit of the odorous gas suction duct. 2. The melting treatment apparatus for medical waste plastics according to claim 1, further comprising a stirring blade which is rotationally driven by an electric motor in the melting furnace. 3. A ring-shaped hot-air blowing pipe provided with a hot-air blowing hole is provided in the melting furnace, and the tip of the circulating gas duct is connected to the hot-air blowing pipe. 2. The melting treatment device for medical waste plastic according to 2.