JPS5881424A - Structure of louver for supporting particle of packed layer - Google Patents

Abstract

PURPOSE:To prevent corossion of a louver, by arranging a sub-louver inclining at a specified angle or more to a horizontal direction to the inner side of a main louver to improve the movement of particles on the louver. CONSTITUTION:To the inner sides of the main lourvers 1 of a moving bed type packed layer, sub-louvers 5 are arranged at pitches same to that of the main louvers in such a manner that the sub-louvers 5 are inclined 60 deg. or more to a horizontal direction and positioned at the intermediate parts of the vertical direction of the main louvers 1. In this case, the louvers are arranged so as not to overlap the row of the main louvers 1 and the row of the sub-louvers 5. By this structure, the non-moving parts of particles on the louvers are eliminated and dust in an exhaust gas is not accumulated and the corrosion of louvers due to the wetting of an adsorbent with sulfuric acid geneated by SO2 adsorption of a saturation amt. or more for over a long time can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a louver structure for filling and supporting particulate matter, and in particular, to a louver structure for filling and supporting particulate matter. The present invention relates to a louver structure for supporting packed bed particles suitable for supporting adsorbents in a packed bed.

Conventionally, when gas is aerated through a packed bed of particulate adsorbent, catalyst, or other particulate matter, components in the gas and particulate matter are brought into contact to perform a reaction or collection, as shown in Figure 1. A moving bed type packed bed is used in which a large number of loopers IA are vertically arranged and particulate matter 2 is supported by the loopers IA.

However, in a moving layer in which particles are supported by such a looper IA, a non-moving part 3 of particles is formed on the looper IA, as shown in FIG.

Therefore, when the girth to be handled contains a large amount of dust, such as the exhaust gas of a coal boiler, the dust gradually accumulates in the non-moving portion 3, resulting in an increase in ventilation loss. Furthermore, when sulfur dioxide gas in the gas is adsorbed using a carbon-based adsorbent such as activated carbon, the adsorbent in the non-moving part 3 becomes wet with sulfuric acid produced by the sulfur dioxide gas over a long period of time. However, there is a problem in that it corrodes the looper IA.

The present invention attempts to improve the above-mentioned drawbacks, and its purpose is to effectively move particles on the louvers.

Helps prevent corrosion of the looper.

In the present invention, as shown in FIG. 2 in the conventional louver IA, the load exerted in the horizontal direction by the mainstream particle group 4 and the load on the non-moving part 3 are balanced, so that as a result, the particles in the non-moving part 3 become the main stream. It is made clear by the flow of colored particles that they do not flow into the particle group 4 and a non-moving part is created, and by destroying the balance of this load, the particles in the non-moving part 3 flow into the mainstream. The third method is to
As shown in the conceptual diagram of the figure, a sub-louver 5 is installed near the louver 1. In this case, the inclination angle α of the sub-louver is such that, of the force applied to the sub-louver based on the filling pressure of the particles, the component force in the downward direction along the two surfaces of the long louver is the friction between the sub-louver surface and the particles. It must be selected so that it has greater strength. Here, the coefficient of friction between the filler particles and the louver material is approximately 0.55 in most cases.9. In this case, the relationship between the angle α that the sub-louver makes with the horizontal direction, the force Fi directed downward along the louver surface, and the frictional force Ff acting between the particle and the louver is as shown in FIG. From this, it is clear that in order to move the filling particles by sliding on the sub-louver, the angle between the sub-louver and the horizontal direction must be 60 degrees or more. On the other hand, the main louver upper filling pressure acts through the gap between the lower end of the main louver and the upper end of the sub louver. If the filling pressure is too high, the movement of particles on the main louver will be hindered.
The length L of the sub-louver and the size of the clearance t between the lower end of the main louver and the upper end of the sub-louver must be optimally selected according to the filling pressure. As shown in Figure 5,
The relationship between the filling pressure and the clearance t between the lower end of the inlouver and the upper end of the sublouper was clarified experimentally. That is, under a certain filling pressure, the movement of particles on the main louver can be improved by setting the clearance t to a smaller value than the value shown in FIG.

Next, one embodiment of the present invention will be described with reference to FIG.

Figure 6 shows an example of application to an adsorbent packed bed for flue gas desulfurization. In this adsorption tower, the packing density of particles is approximately 500Kg/m3
, the height of the packed bed is 15 m. adsorption.

Inside the tower 6, a main louver 1 and a sub-louver 5 are arranged vertically from the bottom to the top of the tower in sets, and these sets are arranged in two rows at a certain distance, Adsorbent 7 is filled between the two rows of louvers.

Exhaust gas 8 from a boiler or the like flows into the adsorption tower 6 through a gas port 9, enters the adsorbent packed bed through a gap 10 in the louver, and flows out through a gas outlet 12 through a gap 11 in the other louver.

During this time, sulfur dioxide gas in the gas is adsorbed and removed.

As time passes, the adsorbent reaches saturation, so a certain amount of the adsorbent is continuously extracted from the packed bed using an extractor 13 installed at the bottom of the packed bed, and a regeneration device (not shown here) ), and the regenerated adsorbent is transferred to hopper 14.
It is supplied to the packed bed and used for circulation. Next, details of a part of the louver in this embodiment will be explained with reference to FIG. 3 again. The main looper 1 is inclined at 60 degrees with respect to the horizontal direction, and the sub louver 5 is arranged in the same direction as the direction in which its louver elements are inclined, and at an angle of 74 degrees with respect to the horizontal direction. 5 is arranged so as to be located midway in the height direction of the main looper 1. In this embodiment, the length of the main louver 1 is 200111%, the length of the sub-louver 5 is 150 mm, and the clearance t between the lower end of the main louver 1 and the upper end of the sub-louver 5 is approximately 30 mm.
It's a fin.

In the packed bed supported by the louvers as described above, when the adsorbed diarrhoea was extracted from the bottom of the column, both the particles on the main louver 1 and the particles on the sub-louver 5 were able to achieve good movement.

Furthermore, another embodiment of the present invention is an example in which the present invention is applied to a packed bed of about 1.5 m, but in this case, the inclination angles that the main looper 1 and the sublouver 5 make with the horizontal direction are 6 (0
degree, 74 degrees, but the length of main looper 1 is 200 m
On the other hand, the length of the sub looper 5 was 80 mm, and a sufficiently good moving state was achieved.

According to the present invention, the sub-louver can prevent the particle filling pressure of the packed bed from being applied to the main looper, and by optimally selecting the inclination angle of the sub-louver, the particle filling pressure of the packed bed can be prevented from being applied to the main looper. The force pushing down the particles downward along the bar surface can be increased as well as the frictional force between the particles and the sub-louver surface, so 4 main louvers,
Particles on any of the sublouvers can be moved extremely well, and non-moving parts can be eliminated. Therefore, dust in the exhaust gas does not accumulate in this area, and even when adsorbing sulfur dioxide gas in the gas with the adsorbent, the dust is moved downward before the adsorbent adsorbs sulfur dioxide gas beyond saturation. This has the effect of preventing corrosion of the louver.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the conventional structure of a packed bed of particulate matter using louvers as a support; Figure 2 is an explanatory diagram showing the flow of particles in the packed bed when conventional louvers are used; 3
The figure is an explanatory diagram of one embodiment of the luniper structure of the present invention, Figure 4 is a diagram showing the relationship between the downward force and frictional force acting on the sub-louver surface, and the sub-louver inclination angle, and Figure 5 is a diagram showing the relationship between the filling pressure and A diagram showing the length of the sub-louver and the clearance between the main louver and the sub-louver in relation to the filling pressure. Figure 6 is an explanatory diagram of the embodiment of Figure 3 of the present invention used in an adsorbent packed bed for flue gas desulfurization. It is. 1... Louver (main louver), 2... Particulate matter, 3... Non-moving part, 4... Main stream particle group, 5...
...Sublouver, 6...Adsorption tower, 7...Adsorbent,
io, 1i ChilI2 Chi21XJ No. 353 Chi'40 #9 θθ Inclination angle ji2 'is figure = filling age, (IJR) ￥2 figure

Claims (1)

[Claims] 1. In a louver structure for supporting particles of a moving bed type packed bed, sub-louvers with an inclination angle of 60" or more with respect to the horizontal direction are installed inside the main louvers arranged at regular intervals in the vertical direction. A packed layer particle support characterized in that the main louvers are arranged vertically at the same pitch so as to be located between the main louvers, and furthermore, they are arranged so that the main louver row and the sub-louver row do not overlap. Louver structure for.