JPS6219240A - Catalytic reactor - Google Patents

Abstract

PURPOSE:To reduce pressure drop in a flow passage and to facilitate control of catalyst by constituting a reactor of a catalyst layer itself or by arranging tubes having relatively high heat conductivity which is provided with a catalyst layer on its surface to contact with adjacent tubes with the tube walls. CONSTITUTION:Reaction tubes each having passage 1A of reactant with a wall 3 constituted of a catalyst and having rectangular sectional shape are placed side by side, and each group of the set of the reaction tubes is laid on another set of the reaction tubes leaving a specified distance forming thus passages 2A for flowing a heat medium 2. Reaction fluid 1 flows through a passage 1A. In another modification of the reactor, the passage of the reactant is formed to have circular cross section and the wall 3 of the passage is constituted of the catalyst, and reaction fluid is flowed countercurrentwise to the heat medium. In a further different modification, fins 22F are protruded in the passage 22A of the heat medium and passages 12 having smaller cross sectional area are formed together with auxiliary walls to the outside of the passage 22A.

Description

[Detailed description of the invention] (Industrial application field) Misfire F! A relates to a compact reactor in which a catalyst layer is formed on the heat transfer surface and the flow paths for the reaction fluid and heat medium are integrated.
For example, it relates to a reactor suitable for decomposition and reforming reactions of methanol and methane.

(Prior art) In a conventional reactor configured with a reaction tube filled with a catalyst, the pressure loss is large and the flow rate cannot be increased, so in order to send a large amount of reaction fluid to the catalyst layer, multiple reactions This method requires tubes, making it unavoidable to increase the size of the reactor.

Furthermore, when the diameter of the reaction tube increases, a temperature gradient occurs in the radial direction of the reaction tube, making it difficult to control the catalytic reaction temperature.

(Problems to be Solved by the Invention) The present invention solves the drawbacks of conventional catalytic reactors, and provides a compact catalytic reaction system that reduces pressure loss in the reaction fluid flow path and facilitates catalyst temperature control. It is intended to provide benefits.

(Means for Solving the Problems) The present invention provides a catalyst 1 on the inner or outer surface of a reaction tube, or the reaction tube itself is composed of a catalyst layer, and the cross-sectional shape of the reaction tube is made rectangular or circular. A plurality of reaction tubes are arranged in parallel and the tube walls are in contact with each other to form a continuous wall surface, and the fluid conduit does not have the graystone tube row and, if necessary, a catalyst layer. The present invention is a catalytic reactor in which heat medium flow paths and reaction fluid flow paths are stacked, characterized in that rows are stacked and auxiliary walls are added as necessary to configure heat medium flow paths and reaction fluid flow paths.

In addition, since the reaction tube provided with the catalyst layer plays the role of heat conduction between the heat medium and the catalyst layer, it is preferable to select all materials having high thermal conductivity. Furthermore, fins may be provided protruding from the reaction tube in the flow path of the heat medium to facilitate heat transfer.

Furthermore, a channel not containing a catalyst layer can also be used for preheating or precooling the reaction fluid. The cross-sectional area of the flow path can be varied depending on the catalytic reaction conditions and thermal conversion conditions.

(Example) FIGS. 1 to 3 are perspective sectional views of an example according to the present invention.

Figure 1 shows an example using a reaction tube with a rectangular cross-section for the reaction channel, in which the reaction channel wall 3 is made of a catalyst and the entire reaction tube is installed.
They are stacked at regular intervals to form a flow path 2A through which the heat medium 2 flows. The reaction fluid 1 flows through the reaction fluid flow path IAi.

Fig. 2 shows an example in which the reaction flow path in Fig. 1 is changed from a rectangular cross-section to a circular cross-section. Indicated.

FIG. 3 shows another modification of FIG. 1, in which a fin 22F is provided protruding inside the heat medium flow path 228, and an auxiliary wall is provided outside the flow path. ,
A channel 12 having a small added channel cross-sectional area was provided. The flow path 1
No. 2 does not have a complete catalyst layer and is suitable for use, for example, in preheating a reaction fluid.

As described above, the reaction tubes can be made up of the catalyst layer itself, or the catalyst layer can be formed on the surface of the reaction tube, which has a relatively high thermal conductivity, and the metal tube walls can be arranged so that they are in contact with each other and stacked at sufficient intervals. hand,
The flow paths for the reaction fluid and heat medium can be formed in various shapes, and are not limited to those shown above.

(Effects of the Invention) By adopting the above configuration, the non-explosion EA can reduce the pressure loss in the catalytic reaction region, and can evenly control the temperature of the catalyst layer in the heat medium. By making the entire structure laminated, we were able to successfully reduce the size of the device.

[Brief explanation of drawings]

1 to 5 are perspective sectional views of embodiments according to the present invention, WE1 and 3 are examples in which the flow channel has a rectangular cross section, and FIG. 2 shows an example in which the reaction fluid flow channel is circular in cross section. This is an example. FIG. 3 is a modified view in which the heat medium flow path is further provided with a full fin and an auxiliary flow path. Sub-Agent 1) Meifuku Agent - Ryo Hagiwara - Sub-Agent Atsuo Anzai

Claims (1)

[Claims] A catalyst layer is provided on the inner or outer surface of the reaction tube, or the reaction tube itself is made up of a catalyst layer, the cross-sectional shape of the reaction tube is rectangular or circular, and a plurality of reaction tubes are arranged in parallel, and , the tube walls are arranged so as to be in contact with each other to form a continuous wall surface, and the reaction tube row and, if necessary, the fluid conduit row having no catalyst layer are stacked, and if necessary, an auxiliary wall is added. A catalytic reactor in which a heat medium flow path and a reaction fluid flow path are stacked, characterized in that the heat medium flow path and the reaction fluid flow path are configured.