JPH0638905B2 - Inclined plate catalyst filling reactor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-tube catalyst filling reactor used in a chemical plant.

[Conventional technology]

As a catalyst filling method for a reaction tube having a tubular structure, there are (1) a direct filling method in which nothing is put in the layer and (2) a substitution filling method using ceramic balls or the like.

[Problems to be solved by the invention]

In the case of the direct filling method of (1), since the falling speed of the catalyst is high,
Collision with the catalyst receiving or dropped catalyst becomes severe, the powdering rate becomes large, the porosity in the bed decreases, and the pressure loss increases.

In the case of the substitution filling method of (2), the catalyst is safe, but since it is necessary to previously fill the ceramic balls and the like, filling takes time and time.

The present invention solves the problems as described above, secures the porosity to reduce the pressure loss, facilitates catalyst filling, and makes it possible to increase the reactor size and shorten the maintenance period. The purpose is to provide a device.

[Means for solving problems]

The present invention relates to a slant plate type catalyst-filled reaction apparatus in which slant plates are provided in the reaction tube so as to be alternately inclined at predetermined intervals in the longitudinal direction.

[Embodiment] [Operation] A structural example of the present invention will be described with reference to the sectional view of FIG. 1 (A) and FIG. 1 (B) which is an explanatory view taken in the direction of arrow a of FIG. 1 (A).

In order to fill the annular portion surrounded by the inclined plate attachment member 2 and the reaction tube 3 with the catalyst, the inclined plate 1 attached to the inclined plate attachment member 2 at a predetermined constant interval (hereinafter referred to as an attachment pitch) is provided.

The inclined plates 1 are alternately arranged at 180 ° (that is, they are alternately arranged with their inclinations being opposite to each other).

The upper notch 1 of the inclined plate 1 has a catalyst particle size of 0 to 0 in order to increase the packing density on the upper back side of the inclined plate 1 in consideration of the catalyst shape.
It is desirable to make it 6 times. Here, 0 times means that there is no cutout, and in the case of a catalyst shape that can maintain the packing density on the back side of the inclined plate 1, no cutout is sufficient. The upper part is notched in order to increase the packing density of the catalyst as described above, and the lower part is not provided with a notch in order to suppress the catalyst falling speed due to the angle formed by this lower part and the tube wall.

The inclination angle α of the inclined plate 1 is set to the reaction tube 3 as described above.
The catalyst falling inside is always one inclined plate 1 below the inclined plate 1.
It is appropriate that the angle is such that the catalyst falls, but the falling speed is suppressed depending on the properties of the catalyst to minimize catalyst damage and the packing density is optimum, for example, in the range of 45 ° ≦ α ≦ 80 °. , Which can vary depending on the type of catalyst.

The mounting pitch P of the inclined plate 1 is also such a pitch that the catalyst always drops from the inclined plate 1 to the next lower inclined plate 1 as described above, that is, does not bypass the inclined plate 1 immediately below, and the catalyst falling speed. It is desirable to set a pitch that can suppress the above phenomenon and ensure the packing density, for example, P = 250 to 1000 mm.

Further, it is desirable that the gap between the inclined plate 1 and the reaction tube 3 is set to a size that does not bypass the catalyst, for example, 2 to 10 mm.

A perforated plate, a wire mesh, a flat plate or the like can be used as the inclined plate 1, and a pipe, a round bar, a square bar or the like can be used as the inclined plate attachment member 2.

According to the present invention, with the above-described configuration, when the catalyst falls in the reaction tube 3, the catalyst always drops from the inclined plate 1 to the next lower inclined plate 1. Therefore, the catalyst is different from other components. Instead, they often collide with the catalyst and generate contact friction.
At the same dropping speed, the pulverization caused by the collision and friction of the catalysts is extremely less than the pulverization caused by the catalyst colliding with or rubbing with other components (mostly metal). Therefore, according to the present invention, pulverization of the catalyst can be prevented.

Further, according to the present invention, the upper portion of the inclined plate 1 is notched in accordance with the shape of the catalyst, so that the packing density of the catalyst can be ensured.

FIG. 2 is a diagram showing the overall configuration of the apparatus to which the configuration example of the present invention shown in FIG. 1 is applied, and FIG. 3 is a diagram showing the overall configuration of a conventional catalyst-filled reaction apparatus for reference. .

In the case of the present invention shown in FIGS. 1 and 2, and in the conventional case shown in FIG. 3, the catalyst filling operation is performed from the upper channel 11 to the lower channel 12 as shown in FIG.
The catalyst is dropped directly into the reaction tube 3 toward the catalyst receiver 7 provided in the.

In FIGS. 2 and 3, 5 is a reactor main body and 6 is a tube plate.

FIG. 4 shows the result of a filling experiment conducted on one tube according to the present invention. The experiment was conducted as follows. The reaction tube (3 inch tube), the inclined plate mounting tube 19 mmφ, and the catalyst filling height 20 m inside the reaction tube, the inclined plate consisting of a perforated plate with 3 mmφ holes arranged in triangular pitches is constructed as shown in FIG. It was attached to and arranged with a pitch of 250 mm. A cylindrical catalyst having a diameter of 5 mm and a length of 5 mm was supplied all at once from the upper part and filled in the reaction tube. After filling the catalyst, ventilate from the top (flow rate 1.6 m /
s), the pressure distribution in the reaction tube was measured. Further, the catalyst in the reaction tube was sampled every 2 m, and the damage state of the catalyst was measured. The catalyst damage rate (ratio of 3300 μm or less) is 4th
As is clear from the figure, there is no great difference in the total length of the reaction tube, and it is understood that the effect of suppressing the falling speed is great. Also, the pressure loss was small, and there was no change with respect to the total length of the tube as is clear from FIG. 4, which indicates that there was no local clogging.

For comparison, FIG. 5 shows the result of a filling experiment into a conventional reaction tube. The experiment of FIG. 5 was conducted under the same conditions as the experiment of FIG. 4, except that the length of the tube was 10 m and that there was no inclined plate. As is apparent from FIG. 5, in the conventional reaction tube, the catalyst damage rate increases as it goes to the lower part of the reaction tube, and as a result, the pressure loss also rapidly increases at the lower part of the tube. I understand.

〔The invention's effect〕

According to the present invention, since the falling speed of the catalyst can be moderated by the inclined plate, it is possible to prevent the catalyst from being pulverized, ensure a uniform void ratio in the layer, and reduce the pressure loss.
In addition, the filling time of the catalyst can be shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of the structure of the device of the present invention, FIG. 2 is a diagram showing the configuration of the entire reaction device to which the example of the configuration of the device of the present invention shown in FIG. 1 is applied, and FIG. 3 is the overall configuration of a conventional device. FIG. 4 is a diagram showing a result of an experiment for filling a reaction tube according to the present invention, and FIG. 5 is a diagram showing a result of an experiment for filling a conventional reaction tube.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Makoto Yamamoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Hideaki Nagai 2-5 Marunouchi, Chiyoda-ku, Tokyo No. 1 Sanritsu Heavy Industries Co., Ltd. (72) Inventor Masaaki Kuwa 3900-20 Niimotojima-cho, Niigata City, Niigata Prefecture (72) Inventor Ikuo Kawakami 3633-1, Matsuhama-cho, Niigata City, Niigata Prefecture (56) Reference JP 62 -106834 (JP, A) Actually opened 63-189334 (JP, U)

Claims (1)

[Claims] 1. A tilted plate type catalyst-filled reaction apparatus, wherein tilted plates are provided in the reaction tube so as to be alternately tilted at predetermined intervals in the longitudinal direction.