JPH0235913A - Dry desulfurization or denitration device - Google Patents

Abstract

PURPOSE:To prevent the generation channeling by setting elements constituting outlet side louvers inclined to a horizontal surface by 30 deg. or more and making their width 0.2-2.0 times as much as the maximum particle diameter or 0.4-4.0 times as much as the average particle diameter. CONSTITUTION:A particle layer 3 is moved between inlet side louvers 4 and outlet side louvers 2a and desulfurization or denitration is carried out by passing the gas to be treated therethrough. The outlet side louvers 2a are constituted of inclined elements 7 inclined to a horizontal surface by 30 deg. or more, and respective elements are connected in the grating or mesh form. The maximum opening width of the inclined element 7 is made 0.1-1.0 times as much as maximum particle diameter or 0.4-4.0 times as much as average particle diameter, and the element width is 0.2-2.0 or 0.4-4.0 times as much as maximum particle diameter. Thus, channeling can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dry desulfurization device or a denitrification device, particularly to the structure of the outlet side louver.

(Prior art) In an apparatus that performs desulfurization or denitration by slowly moving a particulate adsorbent such as activated carbon or a particulate catalyst and bringing it into contact with a process gas, the adsorbent or catalyst particles are filled and moved in a fixed direction. The gas inlet side and gas outlet side of the reaction layer to be moved are
The structure must allow gas to pass through but prevent particles from spilling out.

For this reason, the structure of the partition plate is a louver structure, but if the opening of the louver on the gas outlet side is made large, particles will be blown away by the gas flow, and conversely, if the opening is made small, it will become clogged and the gas This may cause a drift in the flow or an increase in pressure loss.

FIG. 9 shows a conventional louver structure, where 1 is an inlet louver, 2 is an outlet louver, and 3 is the moving direction of the particle layer packed between the louvers 1 and 2.

Reference numeral 4 indicates the gas flow direction, in which the gas passes through the particle layer from the inlet side louver and exits from the outlet side louver 2.

5 indicates particles blown away from the outlet side louver by such a gas flow, indicating that dust is deposited in areas where the flow velocity is low.

FIG. 9(b) shows a partially enlarged view of the louver opening in FIG. 9(a), and the gas flow velocity at this opening exhibits a gas flow velocity distribution as shown by curve a in the figure. That is, the flow velocity increases closer to the upper material forming the outlet opening of the louver. Therefore, as shown in FIG. 9(c), particles 5 are ejected in areas where the flow rate is high (upper side of the figure), and dust 6 is deposited in areas where the flow rate is low (lower side of the figure).

FIG. 10(a) shows another example of the conventional type. In this case, the opening width of the entrance side louver 1 is large, but the exit side louver 2 is made of material C... whose cross section is an isosceles triangle. The width between the bases of the isosceles triangle is extremely small. In other words, the opening width is smaller than the particle diameter. In the case of such a structure, after long-term operation, a problem arises in that particles of small diameter due to wear or breakage clog the opening (FIG. 10(b)).

Figure 10 (c), (d), (e), (f), (g), (
h), (i), and (j) are various examples of the outlet side louver 2, but all of these are configured to have an opening width smaller than the particle diameter, and each has the problems described above. are doing.

(Problems to be Solved by the Invention) In view of the problems of the prior art, an outlet side louver that does not cause clogging of particles on the gas outlet side, which causes uneven flow of gas, and does not cause an increase in pressure loss, has been developed. The challenge is to provide.

(Means for Solving the Problems by the Invention) In a dry desulfurization and denitrification apparatus in which a particle layer is moved between an inlet side louver and an outlet side louver, and a gas to be treated is made to flow across the moving particle layer, the outlet side louver is The material constituting the louver is formed in the shape of a lattice, a mesh, or a perforated plate, and the material constituting the louver is set at 30 degrees with respect to the horizontal plane so that the openings thereof are inclined in a direction that pushes the particles inward with respect to the direction of movement of the particle layer.
The width W2 of the inclined surface of the material is set to 0.2 to 2.0 times the maximum particle diameter, or 0.2 to 2.0 times the average particle diameter.
4 to 4.0 times, and the maximum opening width W of the material is 0.1 to 1.0 times the maximum particle diameter, or 0.2 to 2 times the average particle diameter.
．． It was set to 0 times.

(Example) Now, according to the experimental results, the particles undergo wear and mechanical damage during movement, resulting in a particle size distribution as shown in FIG. 11. That is, the particle size distribution of the initially filled particles or the replenishing particles during operation is as shown in distribution curve a, but after a long period of operation, the overall diameter shifts to the smaller diameter side as shown in the 5-distribution curve. The present invention provides an outlet-side louver that does not become clogged even when the particle diameter is reduced in this manner.

FIG. 1 is a sectional view of a desulfurization and denitration apparatus using an outlet side louver 2a according to the present invention. As shown in FIG. 1(b), the outlet side louver 28 is constructed by arranging inclined materials 7 in parallel in the direction of particle movement. Each inclined material 7... is connected to each other to form a lattice or mesh shape.

The maximum opening width W between the inclined materials 7 (Fig. 3) is 0.1 to 1.0 times the maximum particle diameter d, or 0.2 to 2.0 times the average particle diameter.
It is 0 times. Also, W2 in the material of each inclined material 7 (Fig. 3)
is 0.2 to 2.0 times the maximum particle diameter d or 0 times the average particle diameter
．． 4 to 4.0 times, and the inclination angle α of each inclined material is 30' or more with respect to the horizontal plane. In addition, the particle size in this) is J
It refers to the weight value measured using an IS standard sieve.

FIG. 2 shows an example in which such an exit side louver 2 is made of expanded metal. FIG. 3 similarly shows a second example of the exit side louver, and the exit side louver is composed of a lattice. Further, FIGS. 4 to 8 show an example in which the outlet side louver 2 is formed into a perforated plate shape, and the opening portion is shown in FIG. 4(b).
, FIG. 5(b).

The configuration is as shown in FIG. 6(b), FIG. 7(b), and FIG. 8(b).

That is, Fig. 4 shows a punch plate, Fig. 5 shows one press-formed into a mesh shape without expanding, Fig. 6 shows one formed into a perforated plate shape with a large inclination angle α, and Fig. 7 shows one formed into a perforated plate shape with a large inclination angle α. FIG. 8 shows an example in which the particles are formed into a perforated plate shape and the openings are arranged in a pattern other than staggered, and FIG.

(Effect) The width W2 of the inclined material forming the outlet side louver is 0.2 to 2.0 times the maximum particle diameter, or 0.4 to 4 times the average particle diameter.
．． Due to the small size of about 0 times, Figure 9 (a) and (b)
, the phenomenon of localized gas flow as shown in (c) does not occur. In other words, since the structure has a structure in which both forces and forces are applied, the aperture ratio can be increased, and the gas flow rate in a part of the exit louver is kept uniform and slow, so the aperture width W can be reduced by smaller particles. No particles will block the openings.

Furthermore, since the material that makes up the exit side louver is inclined in the direction of pushing the particles into the particle layer side, a force from the particles that tries to push the moving particles toward the opening between the materials acts on the moving particles. There's nothing to do.

Furthermore, because of this shape, even if the maximum dimension of the opening is considerably larger than the maximum particle diameter, particles will not fall through the opening of the outlet side louver. Of course, since the width W2 of the inclined material is small, all of the particles in contact with the outlet side louver are moving without stagnation, causing dust accumulation as shown at 6 in Fig. 9(c). There is no increase in pressure loss.

[Brief explanation of the drawing]

FIG. 1(a) is a sectional view of a desulfurization device using a louver according to the present invention. FIG. 1(b) is an enlarged view of the section viewed from arrow A in FIG. 1(a). FIG. 2(a) shows a louver constructed in an expanded metal shape. FIG. 2(b) is a partially enlarged view of FIG. 2(a). FIG. 2(c) is a sectional view taken along line BB in FIG. 2(b). Figure 3 shows the lattice-shaped louvers Figure 4 (a), Figure 5 (a), Figure 6 [a], Figure 7 (
a) and FIG. 8(a) show an example of an outlet side louver formed into a perforated plate shape. Figure 4(b), Figure 5(b), Figure 6(b), Figure 7(
b), FIG. 8(b), FIG. 4(a), FIG. 5(a),
FIG. 6(a), FIG. 7(a), and FIG. 8(a) are cc sectional views. FIG. 9(a) is a conventional louver. FIG. 9(b) is an enlarged view of section D in FIG. 9(a), showing the state of flow velocity distribution. FIG. 9(c) shows the same part as FIG. 9(b), and shows the state of the particles in this part. FIG. 10(a) is a sectional view of a conventional desulfurization device. FIG. 10(b) is an enlarged view of section E in FIG. 10(a). FIGS. 10(c) to 10(j) show various examples of conventional exit side louvers. FIG. 11 is a graph showing changes in particle size in the desulfurization equipment. In the figure: 1 Population side louver 2 Exit side louver 2a (
(of the present invention) Exit side louver 3 Movement direction of particles 4 Gas flow direction 5 Particles
6 Dust 7 Graded materials and above Applicant: Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Ohashi Younger brother 1 Figure 1 B-. (b) Figure 2 (c) Figure 3C Figure 4Figure 7Figure 8i 9i4(b) Figure 7(b) Figure 8(b) Figure 5(o) Figure 5(b) Fig. 6 Fig. 6 (b) Fig. 9 Fig. 9 (b) Fig. 9 (C) Fig. 1○ Fig. 10 (b) Figure (C) ( Figure 10 Figure 10 (j)

Claims (1)

[Claims] In a dry type desulfurization and denitrification equipment in which a particle layer is moved between an inlet side louver and an outlet side louver, and the gas to be treated is made to flow across the moving particle layer, the outlet side louver is formed into a grid, a mesh, or a perforated plate. The material constituting the louver is inclined at an inclination angle of 30° or more with respect to the horizontal plane so that the opening is inclined in the direction of pushing the particles into the particle layer with respect to the moving direction of the particle layer. Width of the sloped surface of the material W
_2 is 0.2 to 2.0 times the maximum particle diameter, or 0.4 to 4.0 times the average particle diameter, and the maximum opening width W_1 of the material
0.1 to 1.0 times the maximum particle size, or 0 times the average particle size
．． A dry desulfurization or denitrification device characterized in that the ratio is 2 to 2.0 times.