JPH0898879A - Incineration treatment method of medical waste - Google Patents

Abstract

(57) [Summary] [Structure] The medical waste is contained in a heat-resistant container 16 having a slight gap, and the container is placed in the furnace 2 to rapidly raise the temperature in the furnace. [Effect] The temperature rise in the container 16 is slower than the temperature rise rate in the furnace 2, and the inside of the furnace 2 has already leaked by the time the gas generated by the thermal decomposition of medical waste leaks from the gap. The temperature of the emitted gas is high enough to burn. Therefore, the medical waste is completely burned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for safely incinerating medical waste containing harmful bacteria.

[0002]

2. Description of the Related Art Medical waste is incinerated, but harmful bacteria may be released when the temperature in the furnace is low.
Further, since a large amount of synthetic resins are mixed in medical waste, soot is often generated, and complete treatment is difficult.

[0003]

Bacteria are killed at 400 ° C or higher, and synthetic resins are
It begins to soften at around 50 ° C, and as the temperature rises, it emits black smoke and is thermally decomposed and burned. 80 black smoke and odor
Decomposes and burns above 0 ° C.

Therefore, although it is possible to completely treat it by putting it in a furnace of 800 ° C. or higher, it is a difficult work to put medical waste directly into the furnace of high temperature, and the sealing property of the inlet is high. There is also a problem.

[0005]

The present invention is intended to solve such problems, and the invention of claim 1 stores medical waste in a heat-resistant container having a slight gap. The container is placed in a furnace to rapidly raise the temperature in the furnace, and the invention of claim 2 is the invention of claim 1, in which when the temperature of the furnace rises to 800 ° C. The temperature of 100 ° C. or less is set, and the invention of claim 3 provides the oxidizing atmosphere in the furnace or the flue in the invention of claim 1 or 2.

[0006]

The present invention has the above-mentioned structure, and the temperature rise in the container is slower than the temperature rise rate in the furnace, and the gas generated by the thermal decomposition of medical waste leaks out from the gap. By this time, the temperature in the furnace is already high enough to burn the leaked gas. Therefore, the medical waste is completely burned.

When the furnace or the flue is kept in an oxidizing atmosphere, the gas and soot leaking from the container are completely incinerated.

[0008]

Embodiment 1 In the first embodiment shown in FIG. 1, reference numeral 1 is a furnace body 2 in which a furnace shell made of a steel plate is lined with ceramic fibers.
With a door 3 at the entrance and exit of the truck, and a truck 5 traveling on a rail 4
Is a shuttle furnace which is designed to move in and out of the furnace body, and the furnace body 2 and the door 3 are provided with an excess air burner 6 capable of producing a large amount of excess air. A flue 7 is provided below the furnace body 2, and a chimney 8 is connected to the flue 7. Further, on the ceiling of the furnace body 2, a furnace pressure measuring port 9 and an oxygen sampling port 10 are provided.
And a temperature sensor 11 are provided.

On the trolley 5, a refractory support 12 and a refractory shelf 13 are passed over, and a syringe, a needle, a gauze, a medicine bottle, various tubes, etc. in a poly bucket 17 are placed on top of it. The heat-resistant container 16 with a slight gap was constructed by stacking the waste in three steps, stacking five steps of the refractory ring-shaped casket 14 around it, and covering it with the refractory lid 15. .

The carriage 5 is drawn into the furnace body 2, the door 3 is closed, and the burner 6 is ignited. As shown in FIG.
The temperature was raised to 500 ° C. in minutes, and further raised to 850 ° C. in 4 minutes and kept at that temperature. The atmosphere in the furnace was maintained at an oxygen concentration of 3-4%.

As shown in FIG. 3, the temperature in the container 16 gradually increased from when the furnace temperature exceeded 600 ° C., but did not exceed 100 ° C. even when the furnace temperature reached 850 ° C.

Since the gas ejected from the gap of the container 16 began to self-combust after about 4 minutes with the temperature inside the furnace kept at 850 ° C., the combustion gas in the burner 6 was throttled and the combustion air was left as it was to obtain the oxygen concentration. Was 8-9%.

Further, after about 3 minutes, the amount of gas ejected from the container 16 increased and the oxygen concentration decreased to 3%. Therefore, excess air of a system different from the combustion air of the burner 6 was introduced from the burner 6. However, when the oxygen concentration was controlled so as not to fall below 3% at all times, the gas generation due to the thermal decomposition of the medical waste continued for about 30 minutes.

After the generation of gas is completed, the temperature is further increased to 850 ° C.
It was held for 10 minutes and then extinguished.

No soot is generated during the heat treatment, and the temperature in the furnace rises to 500 ° C. in 2 minutes after ignition,
Dispersion of harmful bacteria outside the furnace is not considered.

If the pressure in the furnace body 1 is set slightly lower than the atmospheric pressure, no gas leaks.

In the second embodiment shown in FIG. 2, the burner 6 provided in the furnace body 2 is an ordinary burner, the flue 7 is bent and long, and the burner 18 for supplying the exhaust air to this flue 18 is used. The medical waste 17 was treated in the same manner as in Example 1 except that the oxygen sampling port 10 was provided.

However, since the burner 6 of the furnace body 2 is an ordinary burner, when the amount of gas ejected from the container 16 increases, the inside of the furnace body 2 becomes a reducing atmosphere and the gas does not burn, so the flue 7 Excessive air is supplied from the burner 18 to control the oxygen concentration in the flue 7 not to fall below 3%,
Soot discharge from the chimney 8 was prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a graph showing temperature changes in the furnace body 2 and the container 16.

[Explanation of symbols]

 2: Furnace body 6: Burner 16: Heat-resistant container 17: Poly bucket containing medical waste

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Claims (3)

[Claims] 1. Incineration of medical waste, characterized in that the medical waste is contained in a heat-resistant container having a slight gap, and the container is placed in a furnace to rapidly raise the temperature in the furnace. Method. 2. A method for incinerating medical waste, wherein the temperature in the container is 100 ° C. or lower when the temperature in the furnace rises to 800 ° C. 3. The method for incinerating medical waste according to claim 1, wherein the inside of the furnace or the flue is kept in an oxidizing atmosphere.