JPS63171400A - Processor for waste containing combustible - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a waste treatment device containing combustible materials.
More specifically, it is a processing device for reducing the volume of combustible materials, and is particularly suitable for use in processing waste resin, which is a type of combustible material generated from nuclear power plants.

(Prior Art) This type of processing apparatus is disclosed in Japanese Patent Laid-Open No. 57-52900. Next, this device will be explained.

In a ball-packed layer filled with mechanically stirred ceramic balls, a slurry containing a combustible material is supplied onto the balls filled with the balls. Then, the carbonization residue from the combustible material that has been thermally decomposed and carbonized in an inert atmosphere is intermittently taken out from below the ball-filled bed portion as it is through the lock gate. On the other hand, the generated gas from the combustible material is guided from below the ball packed bed section to the after-combustion chamber and is combusted.

(Problems to be Solved by the Invention) However, since this method uses only carbonization treatment, the volume can be further reduced by incinerating the carbonization residue, such as waste resin generated from nuclear power plants. However, there is a problem in that the volume reduction properties are still insufficient.

It is an object of the present invention to solve the above-mentioned problems and to be able to carry out combustion treatment advantageously in terms of thermal energy.

(Means for Solving the Problems) In order to achieve the above-mentioned object, there is provided an apparatus for treating waste containing combustible materials according to the present invention.

(a) A ball-packed layer section that mechanically stirs the filled ceramic balls and carbonizes the waste containing combustibles supplied onto the filled balls by thermal decomposition; A filter that is disposed below the packed bed, allows carbonization residue produced by carbonization of the waste containing the combustible material to fall from the ball packed bed section, and has a filter that filters at least gas generated from the combustible material. An apparatus for processing waste containing combustible materials, comprising a chamber section, wherein the ball packed bed section contains a low oxygen concentration gas or non-oxygen gas for thermally decomposing and carbonizing the combustible materials in an inert atmosphere. A first gas supply port for supplying active gas is provided, and the filter chamber section is provided with a second gas supply port for supplying combustion air or combustion oxygen for burning the carbonization residue. This is a characteristic feature.

(Function) By supplying combustion air or combustion oxygen to the filter chamber, the carbonization residue is ignited and incinerated.

Further, a part of the generated gas produced by carbonization due to thermal decomposition of combustible materials is also combusted in the filter chamber by supplying combustion air in an amount that does not reach the explosion limit.

(Example) Next, a specific example of the apparatus for treating waste containing combustible materials according to the present invention will be described with reference to the drawings.

In FIG. 1, the device has a ball filling layer part 1 in the upper part and a filter chamber part 2 in the lower part, and
The ball filling layer section 1 and the filter chamber section 2 are connected to each other through a perforated plate 3 so as to communicate with each other.

The ball packed bed section 1 is constructed by standing up a cylindrical body 4 having a diameter of, for example, 400 rpm and a length of 500 mm, and the ball packed bed section 1 is provided at the axial center of the cylinder body 4. The drive motor 5 installed on the top drives the drive motor 5 at low speed (approximately 1
A rotating shaft 6 is provided which is rotated at a rotational speed (rpn+). A spiral blade is formed around the rotating shaft 6 so that the outer edge is located close to the inner circumferential surface of the cylindrical body 4 and a space is formed between the inner edge and the rotating shaft 6. A stirring blade 7 is provided by being attached to the rotating shaft 6 via a support bone (not shown). In this ball filling layer part 1,
In other words, the cylindrical body 4 is filled with ceramic balls 8 of small diameter. The outer circumferential portion of the cylindrical body 4 is heated at a temperature of 350°C, which is a temperature at which the interior of the cylindrical body 4, including the balls 8, etc., is completely thermally decomposed and carbonized for organic matter, which is a type of combustible material, especially ion exchange resin. An external heater 9 is provided for heating to a temperature above .degree. C. and maintaining the temperature. However, if the temperature becomes too high, there will be problems with the durability of the entire device, so it is not desirable to heat it to a higher temperature than necessary. Note that reference numeral 1.10 is an input port for inputting waste containing organic matter onto the piled balls 8 which are stirred by the stirring blades 7. Also, 1
Reference numeral 1 denotes an inert gas supply port for supplying nitrogen gas, which is a type of inert gas, into the cylindrical body 4 in order to thermally decompose and carbonize organic substances in an inert atmosphere.

The filter chamber portion 2 has a diameter of, for example, 900 mm.
a cylindrical outer body 15; and a tapered cylindrical body connected to the cylindrical body 4 on the lower side and communicating with the cylindrical body 4 through the perforated plate 3 that prevents the ball 8 from falling. Due to the inner and outer double structure with the inner cylinder body 16, the upper space part 17
is formed. Further, on the lower side of the outer cylinder body 15,
A lower space 19 is formed by connecting a conical cylinder 18 having an inclined surface for improving the discharge performance of the burnt carbonization residue, which will be described later.

The outer cylindrical body 15 and the inner cylindrical body 1 in the upper space part 17
6, a plurality of bottomed cylindrical filters 20 (for example, sintered metal or porous ceramic filters 20 are arranged along the annular space). In this manner, the bottomed part 2 is placed at a predetermined interval.
1 is placed so that it hangs downward.

The openings 22 of these filters 20 are connected to gas exhaust passages 23
It communicates with the gas outlet 24 via. Further, a combustion air supply nozzle 26 for supplying combustion air to the carbonization residue is provided at the lower part of the conical cylinder 18, and a combustion air supply nozzle 26 is provided at the bottom for supplying combustion air to the carbonization residue intermittently. A two-stage damper 27 is provided for taking out the material. Further, an external heater 28 is provided on the outer periphery of each of the outer cylindrical body 15 and the conical cylindrical body 18 in order to maintain the upper space 17 and the lower space 19 at a temperature higher than the temperature at which the carbonization residue ignites. . Note that 29 is a nitrogen gas supply pipe for supplying nitrogen gas for backwashing the filter 20.

A heat insulating layer 30 made of a heat insulating material is formed around the outer periphery of the external heaters 9, 28.

Next, the effect will be explained.

The stirring blade 7 is heated to 350°C or higher by the external heater 9.
In other words, the balls 8 deposited in the cylindrical body 4 where the balls 8 are stirred by the
Organic matter, such as a used ion exchange resin generated from a nuclear power plant, is continuously introduced from the top through the input port IO. The organic matter is thermally decomposed and carbonized in the heated ball packed bed section 1 under an inert atmosphere of nitrogen gas supplied from the nitrogen gas supply port 11. The generated carbonization residue is then transferred via the perforated plate 3 to the filter chamber section 2, which is maintained at a temperature higher than the ignition temperature of the carbonization residue by an external heater 28.
to fall. Furthermore, the generated gas generated by carbonization of organic matter also flows into the upper and lower space sections 17 and 19 of the filter chamber section 2 via the porous plate 3. This is because the gas outlet 24 via the filter 20 and the gas exhaust passage 23
This is because the gas is sucked and discharged by the exhaust blower.

The carbonization residue is burned while falling or after falling in the lower space 19 by the combustion air supplied from the combustion air nozzle 26, and is finally deposited at the bottom of the lower space 19 as burned incineration residue. Then, it is intermittently taken out via the two-stage damper 27. Incidentally, a part or most of the gas produced by the carbonization is combusted in the lower space 19 by supplying combustion air in an amount that does not reach the explosion limit. However, the combustion of these carbonization residues and produced gases is carried out quietly and slowly due to the small amount of nitrogen gas and combustion air supplied.

Gases such as the nitrogen gas, the produced gas, and the combustion exhaust gas resulting from combustion of the carbonization residue and the produced gas are filtered and dust removed by the filter 20 . In particular, when used ion exchange resins etc. generated from nuclear power plants are processed, radioactive dust is filtered and removed.

Using the apparatus of this example, an experiment was carried out using an ion exchange resin before use as the organic substance, with the temperature of the ball packed bed section 1 and the filter chamber section 2 being preferably about 600°C, and the following results were obtained. .

The weight of the dry distillation residue was 173 to 1/4 of the dry weight of the ion exchange resin (water content 50%). Moreover, the weight of the burned incineration residue was about 1150 of the dry weight of the ion exchange resin.

According to this embodiment, since nitrogen gas, combustion exhaust gas, etc. are filtered by the filter 20, less dust and radioactive substances are scattered into the exhaust gas system, and the process of the exhaust gas treatment system is simplified. In addition, since the gas produced by carbonization is gradually combusted in the lower space 19, the carbonization residue can be easily combusted, and energy can be saved by maintaining the filter chamber 2 at a temperature higher than the ignition temperature.

In this example, nitrogen gas was supplied in order to carry out the carbonization of organic matter under an inert atmosphere, but other inert gases such as low oxygen concentration gas or helium may be used. In addition, various other organic solids such as organic sludge, filter sludge, etc. can be considered as the organic matter to be introduced.

(Effects of the Invention) Since the carbonization residue is combusted by combustion air or combustion oxygen, the volume of combustible material can be sufficiently reduced. In addition, since the incineration process and the combustion process are performed separately in the ball packed bed section and the filter chamber section,
They can be processed in a manner appropriate to these treatments.

A gas produced by carbonization of a combustible material, a low oxygen concentration gas or inert gas supplied from a first supply port, and combustion air or combustion oxygen supplied from a second supply port,
Since these combustion exhaust gases are collectively filtered by the filter in the filter chamber, less dust is scattered into the exhaust gas system, and the process of the exhaust gas treatment system is simplified.

In addition, by using the gas produced by the carbonization of combustibles to burn the carbonization residue, it becomes easier to burn the carbonization residue, and the filter chamber is heated, reducing the heating energy required to burn the carbonization residue. Energy-efficient incineration treatment can be performed.

[Brief explanation of the drawing]

FIG. 1 is a simple diagram for explaining a specific embodiment of a processing apparatus for slurry containing combustible materials according to the present invention.

Claims (1)

[Claims] 1. (a) A ball that mechanically stirs a filled ceramic ball and carbonizes waste containing combustibles supplied onto the filled ball by pyrolysis. and (b) the balls are disposed below the packed bed, and the carbonization residue produced by carbonization of the waste containing the combustible material is dropped from the ball packed bed section, and at least the ball is disposed below the combustible material. An apparatus for treating waste containing combustibles, comprising a filter chamber section having a filter for filtering generated gas, wherein the ball-filled bed section is provided with a filter chamber section for pyrolyzing the combustibles under an inert atmosphere and carbonizing the combustibles. A first gas supply port is provided for supplying a low oxygen concentration gas or an inert gas for burning the carbonization residue, and a first gas supply port for supplying combustion air or combustion oxygen for burning the carbonization residue is provided in the filter chamber section. 1. An apparatus for processing waste containing combustible materials, characterized in that it is provided with two gas supply ports. 2. The apparatus for treating waste containing combustibles according to claim 1, wherein the inert gas is nitrogen gas. 3. The temperature at which the combustible material is thermally decomposed is 350°C or higher, as claimed in claim 1 or 2.
Equipment for processing waste containing combustible materials as described in 2.