JPH0440727Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a method for removing dust (solid or liquid fine particles) contained in off-gas etc. generated during the vitrification treatment process of high-level waste liquid. The present invention relates to scrubbers, and particularly relates to a technique for dispersing gas mass ejected into the scrubber and guiding it to a dust adsorption section.

"Conventional technology and its problems" In the process of vitrification of high-level waste liquid, the high-level waste liquid is sent into a glass melting furnace, and radioactive substances are mixed into the molten glass and solidified. A scrubber is connected to the glass melting furnace to separate and remove glass powder, radioactive substances, NOx, etc. contained in the off-gas, and dust is removed by passing through the scrubber. The off-gas is further sent to off-gas treatment devices such as an absorption tower, a ruthenium absorption tower, and a HEPA filter tower for treatment.

An example of the structure of a conventional scrubber will be explained based on FIG. 5. A container 2 for storing cleaning liquid 1,
A gas inflow pipe 3 is inserted through the upper part of the container 2, and a filler casing 4 is fitted onto the gas inflow pipe 3 and placed in the cleaning liquid 1.
A dust adsorption section 5 housed in the filler casing 4 and filled with fine ceramic particles or the like for adsorbing dust in the gas, and a cooling device 6 for cooling the cleaning liquid 1. , and a gas outlet pipe 7 for sending out the gas from which dust has been removed in the dust adsorption section 5 to the next processing step described above.

In a scrubber having such a structure, in order to maintain the required functions, it is desirable to feed the off-gas little by little into the cleaning liquid 1 from the gas inflow pipe 3 to cause a uniform reaction in the dust adsorption section 5. .

However, in the scrubber shown in FIG. 5, when the amount of off-gas sent into the gas inflow pipe 3 suddenly increases, when the off-gas blows out from the lower tip of the gas inflow pipe 3, it becomes a large gas mass X, and this gas mass As X is shifted from the center, large bubbles Y are formed only in a part of the dust adsorption section 5, as shown in FIG.
produces a rising slag flow. When a slag flow occurs, it reduces the dust collection efficiency in the dust adsorption section 5 and generates mist due to ripples on the liquid surface.
It is conceivable that the amount of mist scattered to the gas outlet pipe 7 will increase, and a complicated process will be required in the scrubber post-processing process.

The present invention solves these problems in the conventional technology, and aims to generate a uniform flow in the dust adsorption area by ejecting the off-gas into the cleaning liquid in a state where it is dispersed in each direction. It is something.

"Means for solving the problem" The scrubber of the present invention includes a container for storing cleaning liquid, a gas inflow pipe for discharging off-gas downward into the container, and off-gas discharged from the gas inflow pipe into the cleaning liquid. The off-gas discharged into the cleaning liquid is guided horizontally outward by comprising a dispersion section that guides the off-gas horizontally outward, and a dust adsorption section that allows an upward flow of the off-gas to pass through the dispersion section and adsorbs dust. The generation of mist is suppressed by dispersing the cleaning liquid and preventing the generation of bulk flow in the dust adsorption section, thereby reducing the pulsation of the cleaning liquid surface.

"Embodiment" Hereinafter, an embodiment of the scrubber according to the present invention will be described based on FIGS. 1 and 2. Note that parts common to the conventional example are given the same reference numerals to simplify the explanation.

In this embodiment, a dispersion section is provided at the lower end of a gas inflow pipe 3 which is provided downward in a container 2 that stores the cleaning liquid 1, and which guides the off-gas discharged from the gas inflow pipe 3 into the cleaning liquid 1 horizontally outward. The basic configuration includes 8.

As shown in FIG. 2, the dispersion section 8 is formed by attaching a plurality of guide plates 9 so as to intersect with the opening at the lower end of the gas inflow pipe 3. larger than the outer diameter of
It protrudes horizontally outward and extends to the lower part of the dust suction section 5.

In the figure, reference numeral 10 is a cooling water inlet of the cooling device 6, reference numeral 11 is a cooling water outlet of the cooling device 6, and reference numeral 12 is a cleaning liquid for washing off dust attached to the lower part of the dust adsorption section 5 and the dispersion section 8. The discharge device, reference numeral 13, indicates a drain cleaning liquid discharge pipe.

With a scrubber configured like this,
When the off-gas system is in operation, off-gas is sequentially fed into the container 2 from the gas inflow pipe 3, but the off-gas discharged downward at the opening at the lower end of the gas inflow pipe 3 is transferred to the dispersion section 8. After the dust is divided into a plurality of parts by intersecting the guide plate 9, the dust is further guided horizontally outward along the guide plate 9 and divided into independent parts. An upward flow of dust is generated, and dust is adsorbed.

Therefore, unlike the example in Fig. 5, even if a large amount of off-gas is discharged at once, it is dispersed and sent to the dust adsorption section 5 to perform an averaged dust adsorption action. Even when the amount of off-gas is large, averaging suppresses the ripples on the liquid surface and prevents the generation of mist.

Furthermore, as shown by the arrows in FIG. 1, the off-gas rises at the dust adsorption section 5, and by operating the cooling device 6, the cleaning liquid 1 flows downward at this section. A circulating flow is created inside the cleaning fluid, which removes the heat generated by the dissolution of, for example, NOx in the off-gas into the cleaning fluid.

On the other hand, FIGS. 3 and 4 show other embodiments of the scrubber according to the present invention, in which the dispersion section 8
is disposed at a distance below the lower end opening of the gas inflow pipe 3 and is formed in a mountain shape, and between the lower end of the gas inflow pipe 3 and the filler casing 4. and a perforated plate 15 arranged to partition these spaces. Then, when the off-gas is discharged, the dispersion plate 14
The downward flow is guided to the outside in the radial direction, and then passed through the perforated plate 15, which separates the rising gas from the many small holes and sends it to the dust adsorption section 5 for uniformity. .

"Effects of the Invention" As explained above, the scrubber of the present invention includes a gas inflow pipe that discharges off-gas downward into a container that stores cleaning liquid, and a gas inflow pipe that discharges off-gas into the cleaning liquid from the gas inflow pipe. Since it is provided with a dispersion section that guides the off-gas horizontally outward and a dust adsorption section that allows the upward flow of off-gas to pass through the dispersion section and adsorbs dust, the amount of off-gas sent into the gas inflow pipe can be reduced. Even if there is a sudden increase in the amount of dust, the off-gas is dispersed, so there is less chance of a large gas lump forming at the bottom of the gas inlet pipe, and the off-gas is divided and moves up the dust adsorption section. By averaging the upward flow, it is possible to suppress ripples on the liquid surface and prevent the generation of mist. For this reason, excellent effects such as simplifying the off-gas treatment in the post-treatment process of the scrubber and improving the adsorption efficiency in the dust adsorption section are achieved.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing one embodiment of the scrubber according to the present invention, FIG. 2 is a perspective view of the dispersion section in FIG. 1, and FIG. 3 is a front sectional view showing another embodiment of the scrubber according to the present invention. 4 is a cross-sectional view taken along the - line arrow in FIG. 3, and FIG. 5 is a front sectional view showing a conventional example of a scrubber. DESCRIPTION OF SYMBOLS 1...Cleaning liquid, 2...Container, 3...Gas inflow pipe, 4...Casing for filler material, 5...Dust adsorption part, 6...Cooling device, 7...Gas outflow pipe, 8...
...Dispersion section, 9...Guide plate, 10...Cooling water inlet, 11...Cooling water outlet, 12...Cleaning liquid discharge device, 13...Drain section cleaning liquid discharge pipe, 14...Dispersion plate, 15...Porous hole Plate, X... gas mass, Y...
foam.

Claims (1)

[Scope of utility model registration request] A container for storing cleaning liquid, a gas inflow pipe for discharging off-gas downward into the container, a dispersion section for guiding the off-gas discharged into the cleaning solution from the gas inflow pipe horizontally outward, and A scrubber characterized by being provided with a dust adsorption section that allows an upward flow of off-gas to pass through and adsorbs dust.