JPS59329A - Moving layer type packed tower for granular substance - Google Patents

Abstract

PURPOSE:To make it possible to certainly collect and recover a scattered adsorbent even if the speed of a gas to be treated or an adsorbent particle is changed in a wide range, by providing a louver having plural openings to the gas outlet side in a moving layer type gas adsorbing tower. CONSTITUTION:An industrial exhaust gas containing dust or SO2 is introduced into a moving layer type gas adsorbing tower from the gas inlet 1 thereof and passed through adsorbent particles 5 falling between the inlet side louver 3 and the outlet side louver 4 to adsorb and remove dust or SO2 in the exhaust gas while a clean gas is exhausted from the outlet 2 thereof. At this time, dust or the adsorbent 5 are inssued out of the louver 4 by the supply speed of the supplied exhaust gas or the speed of the adsorbent 5 falling between the louvers 3, 4. In order to collect the issued-out dust or the adsorbent, a separate louver 6 is provided between the outlet side louver 4 and the vessel wall and the scattered dust or the adsorbent are repelled by the louver 6 to be collected in the lower space B and combined with the adsorbent 5 falling between the louvers 3, 4 to be withdrawn from a withdrawing port 9. The withdrawn adsorbent 5 is regenerated and returned to a hopper 8 to regenerate and utilize the adsorbent at high yield.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving bed type particulate material packed column, and particularly to a moving bed type particulate material suitable for collecting dust and particulate matter scattered from the packed bed and returning them to the particulate material packed bed. Regarding packed towers.

Conventionally, in a moving bed type particulate material packed column, exhaust gas is vented through a bed packed with particulate adsorbents, catalysts, or other particulate materials, and components in the exhaust gas are brought into contact with the particulate materials to perform adsorption, reaction, or collection. . In the case of such a packed tower 1, for example, a moving bed adsorption tower, a looper 3 and a seaper 4 are installed on the gas population side and the gas outlet side 2, respectively, as shown in FIG. A moving bed type packed bed is used.

However, 1.2, in such a moving bed adsorption tower, depending on the flow rate of exhaust gas, gas properties, movement speed of particulate matter, etc.
A non-moving part of the particulate material inside the looper is formed.

Therefore, there is a problem in that dust gradually accumulates in the non-moving particulate matter, increasing the ventilation loss. In addition, when sulfur oxides in gas are adsorbed using a carbon-based adsorbent such as activated carbon, the adsorbent that remains on the non-moving part adsorbs sulfur oxides to a level exceeding saturation over a long period of time, causing the surface of the adsorbent to become There is a problem in that the loopers 3 and 4 become wet due to the sulfuric acid generated from the adsorbed sulfur oxides, and corrode the loopers 3 and 4.

Furthermore, if the moving speed of the particulate matter in the filling 1- is slow and the number of exhaust gas flow lids increases and the gas velocity increases, the dust in the filling part J and the particulate matter in the gas outlet louver part 4 will be scattered. arise. A problem arises in that these scattered objects gradually accumulate from the outermost part of the gas outlet looper 4.

The purpose of the present invention is to solve the problems of the prior art described above,
It is an object of the present invention to provide a moving bed type particulate material optical horizontal tower capable of stable operation regardless of the flow rate of exhaust gas and the moving speed of dust and particulate matter.

In short, the present invention allows dust accumulated in the packed bed and particulate matter to scatter to the gas outlet side to a certain extent, and allows these scattered matters to be dispersed in the bed with a large number of openings spaced apart from the particulate material packed bed. The material is allowed to fall by gravity in the space between it and the flow bulkhead, and the flying objects that fly at long distances are collected by colliding with the wake bulkhead, and the collected material is returned to the packed bed. It is.

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 2 shows an example in which the present invention is applied to a moving bed type gas suction system for flue gas desulfurization.

In Figure 2, the gas adsorption tower is on the gas population 1 side and on the gas output side 0.
．． 1! Two rows of loopers 3 and 4 are arranged vertically from the bottom of the column to the top of the column between the loopers 3 and 2, and a granular vIJ material 5 is filled between these loopers 3 and 4. is the same as the conventional device shown in FIG.

In this embodiment, a looper 6 is disposed vertically from the bottom of the column to the top of the column with an interval from the looper 4, and a space A is formed in the gas outlet space. Therefore, in this embodiment, the volume of the entire group of gas outlet spaces is larger than in the case of the conventional device shown in FIG. Furthermore, looper 4
The lowest part of the column constitutes a lower hopper for the packed bed by a vertical part 4A and an inclined part 4B, and the bottom wall of the column main body is arranged with a distance B from these vertical parts 4A and inclined part 4B, and by this distance B. The lower hopper of the space A constitutes the lower hopper.

Here, an inclined part 7A, a vertical part 7B, and an inclined part 7C are sequentially formed on the bottom wall of the tower body. In FIG. 2, 8 is an adsorbent hopper, and 9 is an extractor.

In such a moving bed type gas adsorption tower, the exhaust gas from the boiler, etc. flows into the adsorption tower from the gas population 1, enters the adsorbent packed bed through the gap in the looper 3, and passes through the gas outlet through the looper 4.
However, during this time, sulfur oxides in the gas are adsorbed and
removed. Particulate matter that adsorbs sulfur oxides (adsorbent)
Reference numeral 5 indicates that an extractor 9 installed at the bottom of the packed bed continuously extracts a certain amount of adsorbent from the packed bed, transfers it to a regenerator (not shown here), and transfers the regenerated adsorbent to a hopper 8.
Then, it is supplied into the packed bed and used for circulation.

Here, the dust and particulate matter scattered from the gaps in the looper 4 fall due to gravity in the space A, and among these dust and particulate matter, the A-scattered matter having a larger scattering distance is sent to the looper 6.
It collides with and is collected, passes through the lower hopper formed by gap B, and joins the mainstream of the packed bed adsorbent as a collected material.

Next, the behavior of scattered objects in the vicinity of the looper 6 downstream of the gas outlet louver 4 is shown in FIG.

Relatively large particles a scattered from the looper 4 fall due to gravity, and particles with high jump speed collide with the looper 6 and are collected, as shown in the trajectory, and fall downward to the bottom. are collected in.

Space width of looper 4 and looper 6 1. varies depending on the type of particulate material, particle size, specific gravity, and gas flow rate, but a model test showed that 300 to 600+a+ was appropriate for carbon-based adsorbents packed in adsorption towers for flue gas desulfurization.

The shape of the blades of the looper 6 varies depending on the properties of the particulate matter and the gas flow rate, but the looper length is 1. and N t between the loopers are determined in consideration of pressure loss. Further, by making the inclination angle α of the looper 6 larger than the inclination angle of the looper 4, and by providing an overlap h between the upper looper blade and the lower looper blade, a good collection effect can be obtained.

Next, details of the vicinity of the lower hopper formed by the gap B will be explained with reference to FIG.

In FIG. 4, the length t4 and the inclination angle β of the inclined part 4B are determined by the particle size, specific height, and filling surface pressure of the granular material in the packed bed, but the inclination angle β is smaller than the inclination angle of the inclined part 7C. It is desirable to increase the size, and for carbon-based adsorbents 30
The temperature was good.

In addition, in the inflow portion of the collected material, the inclination starting point of the inclined portion 4B is located higher than the inclination starting point of the inclined portion 7β of the lower hopper by providing a difference t6 between the inclination starting points, thereby facilitating the flow of the collected material. be able to.

In the present invention, when the gas flow rate is high, instead of the looper 6 shown in the figure, a double wire mesh, a punching plate, or a perforated plate having a large number of slit-shaped openings is used to efficiently perform inertial collision, and Scattered dust and particulate matter can be efficiently collected.

In addition, in the present invention, the looper 3.4 supporting the packed bed
Instead, a partition wall such as a wire mesh, a punching plate, or a perforated plate having a large number of slit-like openings may be used. In this case, particles smaller than the inner diameter of the openings formed in these partition walls will scatter into the gas outlet space, so these scattered particles can be collected in the same way as in the illustrated example and returned to the packed bed. I can do it.

Note that the present invention is not limited to moving bed type gas adsorption towers, but also involves bringing components in exhaust gas into contact with particulate matter in a moving bed type packed bed.
A moving bed type light tower (2) that performs reactions other than adsorption can also be applied.

As described above, according to the present invention, even if the gas flow rate and the moving speed of the particulate material filling are varied over a wide range in order to avoid stagnation of particulate matter in the packed bed, accumulation of dust, etc., the dust scattered from the packed bed is Accurately collects and particulate matter,
Moreover, since it can be returned to the packed bed, gas treatment can be performed stably and efficiently, and the equipment is simple.

[Brief explanation of the drawing]

W, Figure 1 is a schematic diagram of a conventional moving bed gas adsorption tower,
FIG. 2 is a schematic diagram of a moving bed type gas adsorption tower showing an embodiment of the present invention, and FIGS. 3 and 4 are detailed views of the main parts of FIG. 2, respectively. 1... Gas population 2... Gas outlet 3, 4.6.
... Looper 5 ... S-shaped GA agent Tatsu Unuma
Figure 1 Figure 2 Figure 3 Figure 4

Claims (4)

[Claims] (1) Forming a moving bed filled with particulate matter within two partition walls for supporting particulate matter having a large number of openings] 11. This moving bed creates a gas inlet space and a gas outlet space in the column. In the moving bed type particulate matter packed column which is provided in sections, a downstream partition wall having a large number of openings is provided in the gas outlet space at a distance from the particulate material supporting partition wall on the gas exit space side. Characteristic moving bed type granular material packed column. (2) The moving bed type particulate material packed tower according to claim 1, wherein the moving bed type particulate material packed tower is a moving bed type gas adsorption tower. (3) The moving bed type particulate material packed tower according to claim (1), wherein the particulate material supporting partition wall is a sheeter. (4) The moving bed type particulate material packed column according to claim (1), wherein the downstream partition wall is a looper.