JPS58879Y2 - Pollutant treatment equipment - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an apparatus for treating pollutants.

Nuclear power plants and other places that handle radioactive materials generate waste containing radioactive materials.

Waste containing radioactive materials has the potential to harm living things, so it must be disposed of in a way that will not harm living things.

Conventionally, the following methods have been used to convert waste into a form that does not harm living organisms.

In other words, particularly harmful parts were separated and solidified from the waste, or compressed and reduced in volume to create small lumps of pollutants, which were then hardened with concrete.

Since this method requires a considerable amount of time for the concrete to solidify, it is difficult to carry out the method continuously, and therefore a batch method has to be used.

Recently, attempts have been made to use bitumen and harden it with asphalt, but this attempt lumps pollutants, making it inconvenient to handle the resulting material.

This idea was based on the confirmation that it is possible to make polluting substances harmless by simply permeating them with asphalt, rather than hardening them with asphalt. It provides:

In other words, this idea consists of rotatably installing a screw inside the cylinder, making the cylinder double-walled with a passage for the heating medium between them, and tilting the axis of the cylinder so that it can move from the lower end of the cylinder toward the upper end. In order, the entrance of the cladding material,
This relates to a pollutant treatment device that is provided with a pollutant supply port, a covering material overflow port, and a pollutant discharge port, and uses a screw to move the pollutant from the supply port to the discharge port. .

The device of this invention will be explained based on the drawings as follows.

The drawing is a longitudinal sectional view of the device according to the invention.

In the figure, 1 is a cylinder, 2 is an outer wall, 3 is a heating medium passage, 4 is a screw shaft, 5 is a screw blade, 6 and 7 are bearings, 8 is a supply port for pollutants, 9 is an inlet of a coating material,
10 is a discharge port for pollutants, 11 is a sealing lid, 12 is an intermediate inspection hole, 13 is an overflow pipe, 14 is a free surface of the molten coating material, 15 is a heating medium inlet, 16 is a heating medium outlet, 17 is a coating material emergency outlet, 18 is a covering layer of thermal insulation material, 1
9 is a support.

The device according to this invention has a structure as described below.

The cylinder 1 is supported by struts 19 and is inclined.

The degree of inclination is such that the angle α that the axis of the cylinder 1 makes with the horizontal plane G is within the range of 5° to 45°.

Among these, α is particularly preferably 20°.

Both the upper and lower ends of the cylinder are hermetically closed with a sealing lid 11.

Among them, the upper end side sealing lid 11 has a main bearing 6 in the center.
and supports the screw shaft 4.

Further, the sealing lid 11 on the lower end side is provided with a heating medium passage 3 on its negative side, and the passage 3 is connected to the heating medium outlet 16.

The lower end side of the screw shaft 4 is supported by a bearing 7.

The bearing 7 is fixed to the inner surface of the cylinder by a plurality of radial ribs.

The screw blade 5 is rotated by the rotation of the screw shaft 4.
The substance in the cylinder is gradually advanced from the lower end to the upper end.

The heating medium passage 3 is provided not only on the entire outer surface of the cylinder 1 but also on the outer surface of the supply port 8, the input port 19, and the discharge port 10,
A covering layer 18 covers it.

The covering layer 18 is for blocking heat radiation from the cylinder 1.

The inlet 9 of the covering material is provided on the lower end side of the cylinder and faces upward.

The coating material introduced from the inlet 9 is maintained in a molten state by heating the inner surface of the cylinder, but since the axis of the cylinder is inclined and the overflow pipe 13 is opened in the middle of the cylinder 1, the coating material is poured from there. Excess dressing material is flushed out.

The free surface 14 of the dressing is therefore in the middle of the cylinder and therefore below the pollutant outlet 10.

The pollutant supply port 8 is provided at the lower end of the cylinder 1 and faces upward.

Further, a pollutant discharge port 10 is provided on the upper end side of the cylinder 1 so as to face downward.

Therefore, the pollutants supplied from the supply port 8 are initially immersed in the coating material, but as they are pushed up inside the cylinder 1 by the screw blades 5 and gradually rise, they come out of the coating material and adhere to the surface. The excess coating material is allowed to flow down, and progresses toward the discharge port 10 in the form of particles.

Therefore, pollutants mainly penetrate into the coating material.

Incidentally, an emergency outlet 17 is attached to the lower end of the cylinder 1 so that the substance inside the cylinder 1 can be rapidly discharged in case of an emergency.

The device of this invention is used in the following manner.

First, the emergency discharge port 17 is closed, the coating material is introduced from the inlet 9, and the heating medium or heating steam is introduced from the inlet 15 and discharged from the outlet 16 to heat the wall surface of the cylinder 1 and melt the coating material. Keep it.

Bitumen is suitable as a covering material.

Next, the prime mover 20 is rotated to rotate the screw shaft 4 to 1
Rotate at a very low rotation speed of about 0.5 times per minute.

In this state, the radioactive solid material is dropped little by little from the supply port 8.

Then, the radioactive substance falls between the screw blades 5 and is propelled toward the discharge port 10 very gradually by the rotation of the screw blades 5.

During this time, since the radioactive substance is immersed in the covering material, the entire surface is covered with the covering material, and the covering material penetrates well into the interior.

The radioactive material then passes through the free surface 14 of the dressing, exits the dressing, is stripped of any excess dressing adhering to the surface, and is removed through the outlet 10.

The radioactive substance taken out from the discharge port 10 is not covered with the covering material over its entire surface, but rather the covering material has penetrated into the inside of the material, so that its radiation performance is blocked.

Therefore, with this device, it is possible to extract radioactive substances in almost their original form and as less harmful substances.

Moreover, according to this device, radioactive materials can be treated continuously even if they are sealed, so there is almost no danger.

Furthermore, since this device has a simple mechanism, it is less likely to break down and is easy to operate.

In this respect, the device of this invention has great practical value.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of the device according to this invention. In the figure, 1 is a cylinder, 2 is an outer wall, 3 is a heating medium passage, 4 is a screw shaft, 5 is a screw blade, 8 is a supply port for pollutants, 9 is an inlet of a coating material, and 10 is a discharge port for pollutants. be.

Claims (1)

[Scope of utility model registration request] A screw is rotatably installed in the cylinder, the cylinder is made into a double wall, a passage for the heating medium is provided between them, the axis of the cylinder is inclined, and the inlet of the coating material is sequentially installed from the bottom end of the cylinder to the top end. A pollutant treatment device that has a pollutant supply port, a covering material overflow port, and a pollutant discharge port, and uses a screw to move the pollutant from the supply port to the discharge port.