JPS599880B2 - Radioactive waste combustion gas purification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a combustion gas purification device used for purifying exhaust gas generated by incineration of radioactive waste to reduce the volume by burning solid or liquid combustible radioactive waste. It is related to.

The purpose of the present invention is to have a simple structure, easy handling, no fear of corrosion or leakage of radioactivity, extremely easy replacement of filter plugs, and safe removal of ash generated by collection and reburning. An object of the present invention is to provide a combustion gas purification device that can reliably discharge combustion gas.

According to the present invention, this purpose is achieved by a heat-resistant plate having a large number of through-holes, in which a porous ceramic filter plug, which is open only on one side, is inserted and suspended airtightly, and is lined with a refractory material. The interior of the fuselage is divided into an upper purification gas discharge chamber and a lower sedation chamber, with a purification gas outlet on the side wall of the upper purification gas discharge chamber where the filter plug opens, and a combustion gas inlet on the side wall of the lower sedation chamber. An ash discharge port is installed at the bottom, and a swingable bottom cover is installed on the ash discharge port, and it is covered with a glove box for removing ash, and a top cover can be attached and removed at the top of the purified gas discharge chamber. This is achieved by a combustion gas purifying device having a structure in which the filter plug is replaced with the upper cover and can be replaced at any time by a replacement device.

A more detailed configuration of the present invention will be explained below based on FIG. 1 showing one specific example.

The combustion gas purification device according to the present invention consists of a steel body 1 lined with a refractory material, and inside the body, porous ceramic filter plugs 5 are installed in the upper part of the body and have a number of through holes. It is divided into an upper combustion gas discharge chamber 2 and a lower sedation chamber 3 by a heat-resistant plate 4 made of steel or ceramic which is inserted and suspended in an airtight manner.

The combustion gas discharged from the incinerator (not shown) enters the purification device through the combustion gas inlet 6 provided on the lower side of the sedation chamber 3, and after passing through the sedation chamber 3, it forms a cylindrical shape with a closed lower end. It passes through the filter plug 5, which has a shape of The combustion gas enters the combustion gas discharge chamber 2, is discharged through the gas discharge port 7, is mixed with room temperature air in a mixing device (not shown), is cooled, and is then discharged into the atmosphere via a chimney by a blower.

On the other hand, the soot and dust collected by the filter plug 5 is 800 to 90
It is reburned at a temperature of 0° C. and the resulting ash is discharged through a discharge opening 9 by opening a swingable bottom cover 8 provided at the bottom of the body.

The preheating gas required to start the operation of the purification device flows into the sedation chamber 3 through the combustion gas inlet 6 and flows out through the opening 10 installed above the sedation chamber 3, or flows into the sedation chamber 3 through the opening 10 and passes through the discharge port. It is preferable to discharge the water through 7.

Further, although the inside of the purification device is suctioned to negative pressure through the discharge port 1, an explosion-proof valve 11 is installed in the sedation chamber 3 to prevent an explosion.

Further, a top cover 12 is detachably attached to the upper side of the purified gas discharge chamber 2 using a flange or the like, and when the filter plug 5 is to be maintained, inspected or replaced, a replacement device 13 installed at the place is used to replace the top cover 12 with the filter plug 5. 5 can be replaced at any time.

A specific example of the exchange device 13 is shown in the upper part of FIG. 1 and in FIG.

The exchange device 13 in this specific example is configured as a glove box that is fixedly installed on the upper lid 12 even during operation of the combustion gas purification device.

The filter plug 5 is replaced as follows.

First, the top cover 12 was pulled up inside the box to above the window 15 as shown in FIG. The filter plug 5 is pulled out from the heat-resistant plate 4 using gloves and replaced.

Alternatively, the flange portion of the filter plug 5 can be broken with a tool inserted through the tool insertion port 18, and the filter plug 5 can be replaced by dropping the flange portion below.

Note that when a large number of purification devices are arranged in parallel for incineration of radioactive waste, a mobile exchange device 19 shown in FIG. 3 may be used instead of the fixed exchange device shown in FIGS. 1 and 2. Advantageous to use.

This exchanger 19 is installed in the purifier after removing the upper cover of the purifier, and consists of a tenth part 20 and a lower part 21. Inside the lower part 21, the heat-resistant plate 4 is moved together with the filter plug 5 at one point by a tension rod 22. It is pulled up to the position shown by the chain line and held by the mooring device 23.

For this purpose, a hook 24 is provided on the upper surface of the heat-resistant plate 4, which engages with a tension rod 22.

The filter plug 5 is replaced using a glove installed in the glove opening 25 and a tool inserted through the tool insertion port 26.

The upper part 20 of the exchange device 19 is frustoconically shaped and has at least one observation window 27 .

According to this mobile exchange device, filter plugs of a plurality of purifiers can be replaced with one exchange device.

Furthermore, in the present invention, a glove box 28 for removing ash is provided below the discharge port 9 at the bottom of the purification device, as shown in FIG. a glove opening 29, at least one window 30, and a tool insertion opening 31.

As mentioned above, when the bottom cover 8 is opened, the ash generated by the re-combustion falls into the glove box 28 through the discharge opening 9, and passes through the coarse grid 33 into the storage container 32 which is airtightly connected thereto. It falls and is stored.

Note that the filter plug that falls when replacing the filter plug is crushed using a tool inserted through the tool insertion opening 31 with a glove installed in the glove opening 29 on the roughing element 33 and stored in the storage container 32. Can be done.

As described above, the present invention is capable of effectively collecting soot and dust in combustion gas discharged from an incinerator and removing it by reburning using a large number of cylindrical porous ceramic filter plugs with closed lower ends. In addition, the filter plug can be easily and quickly replaced using a replacement device, and since the replacement device itself can be configured as a glove box, radiation scattering can be sufficiently prevented. Since it is covered by a glove box with a movable bottom lid, it is easy to remove the ash from the combustion gas purification device, completely prevent radioactivity from scattering, and also cool the ash and put it into the storage container. It has many advantages such as ease of input.

Therefore, for example, it is ideal for purifying radioactive waste generated from nuclear power plants and exhaust gas emitted from incinerators.
This is an industrially useful combustion gas purification device.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view showing one specific example of the combustion gas purification device according to the present invention, FIG. 2 is an enlarged explanatory view of a filter plug replacement device, and FIG. 3 is a diagram showing different specific examples of the filter plug replacement device. It is an explanatory diagram. 1...Body of purification device, 2...Combustion gas discharge chamber, 3...Sedation chamber, 4...Heat-resistant plate, 5...・Filter plug, 6... Combustion gas inlet, 7... Purified gas outlet, 8...
...Bottom lid, 9...Ash discharge opening, 12...
...Top lid, 13... Fixed filter plug exchange device, 19... Mobile filter plug change device, 28... Glove box for ash removal, 3
2...Storage container.

Claims (1)

[Claims] 1 The inside of the body, which has many through holes and is lined with fireproof material by a heat-resistant plate suspended by airtightly inserting a porous ceramic filter plug that opens only on one side into each through-hole, discharges purified gas from the upper side. The chamber is divided into a chamber and a lower sedation chamber, and a purified gas discharge port is provided on the side wall of the upper purified gas discharge chamber through which the filter plug opens, a combustion gas inlet is provided on the side wall of the lower sedation chamber, and an ash discharge port is provided at the bottom. Each chamber is installed with an opening, and the ash discharge port is equipped with a swingable bottom cover, which is covered by a vacuum box for removing ash, and a removable top cover is installed at the top of the purified gas discharge chamber. 1. A combustion gas purification apparatus for radioactive waste, characterized in that the filter plug has a structure in which the filter plug can be replaced at any time by a replacement device in place of the upper cover.