JPS6265902A - Reactor for decomposing methanol - Google Patents

Abstract

PURPOSE:To uniformly supply methanol vapor into a catalyst bed with a low pressure drop by providing a low-pressure drop spacer member such as a wire mesh between the upper catalyst supporting plate and the lower supporting plate in the title reactor for decomposing methanol wherein the catalyst is packed on the outside of a heating tube. CONSTITUTION:The vapor of methanol is supplied from an inlet 4 of the methanol decomposing reactor 1 wherein a catalyst bed 9 is provided on the outside of the heating tube 10. The methanol vapor is accumulated between a tube plate 6 and the catalyst supporting plate 7. When the pressure of the methanol vapor in the space increases to a specified pressure, the vapor is uniformly supplied to the catalyst bed 9 through the opening of a wire mesh spread on the stepped part between the lower catalyst supporting plate 7 and the upper supporting plate 8, a slit, a grid, etc., 15. Since the catalyst 9 is also supported by the methanol vapor distributing mechanism consisting of the wire mesh, slit, grid., etc., 15, methanol vapor can be uniformly supplied into the catalyst 9 with a low pressure drop.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reactor for decomposing or reforming methanol.

[Conventional technology]

Conventionally, the inside of the reaction tube was filled with a catalyst and the methanol vapor flowed inside the reaction tube, and uniformity of the flow within the catalyst layer was not so much of a problem. In a methanol decomposition reactor filled with a catalyst, it is important to uniformly supply methanol vapor into the catalyst bed.

[Problem that the invention seeks to solve]

In a reactor having a structure in which a catalyst is packed outside a heating tube, it is necessary to ensure as uniform a flow of methanol vapor as possible inside the catalyst layer from a performance standpoint. When methanol vapor is supplied to the reactor, it flows into the catalyst layer through holes in a perforated plate that also serves as a catalyst tray, but this perforated plate has a pressure loss on the methanol side. It is required to be small and have the ability to evenly distribute methanol vapor.

An object of the present invention is to provide a methanol decomposition reactor having a steam distribution mechanism with low pressure loss that satisfies the above-mentioned functions.

[Means for solving problems]

In a methanol decomposition reactor having a structure in which a catalyst is packed outside a heating tube, there is a catalyst support plate provided in multiple stages at the end of the catalyst layer and a low pressure drop gap stretched between the steps of the catalyst support plate. In order to uniformly flow methanol vapor into the catalyst layer, it is necessary to consider two points. One is that disturbances on the supplied methanol vapor side (flow rate fluctuations, pressure fluctuations, etc.) can be absorbed to some extent, and pressure loss is small with respect to distribution to each catalyst layer.

In the present invention, a structure that satisfies these two points is considered, and members with low pressure loss and gaps include wire mesh, slits,
Examples include lattices, honeycomb structural members, and the like.

[Effect]

A vapor distribution mechanism is provided in place of the perforated plate, and this vapor distribution mechanism itself serves as a tray for the catalyst, resulting in low pressure loss, so that methanol vapor is uniformly supplied into the catalyst layer.

〔Example〕

Embodiments of the present invention are shown in FIGS. 1 to 3.

FIG. 1 is an illustrative diagram of a vertical decomposition reactor, FIG. 2 is a longitudinal sectional view of a vapor dispersion mechanism, and FIG. 3 is a perspective view of the vapor dispersion mechanism.

In FIGS. 1 to 5, methanol vapor is led from the methanol vapor inlet nozzle stub 1 to the reactor main body 2, but initially the methanol vapor accumulates between the tube plate 2 and the catalyst support lower plate 2. When the pressure in this space reaches a predetermined pressure, methanol vapor is uniformly supplied to the catalyst layer through the wire mesh [phase] stretched between the steps of the catalyst support upper plate (1) and the catalyst support lower plate (2).

The catalyst support plates (1) and (2) have a sleeve (phase) on the outside of the heating tube, as shown in FIG. 5, and are supported by this.

〔Effect of the invention〕

According to the methanol decomposition reactor of the present invention, not only can methanol vapor be uniformly supplied, but also the pressure loss of the methanol system can be reduced, and the storage device in which the vapor distribution mechanism functions as a catalyst tray can be simplified. This also improves reliability.

[Brief explanation of drawings]

FIG. 1 is an illustrative view of an embodiment of the apparatus of the present invention, FIG. 2 is a longitudinal sectional view of a vapor dispersion mechanism, and FIG. 3 is a perspective view of the vapor dispersion mechanism. ■・・・Reactor main body, ■・・・Heat medium control stand, ■・・・
Heat medium outlet nozzle, ■... Methanol vapor inlet nozzle, ■.
...Gas outlet pipe, ■...Tube sheet, ■...Catalyst support lower plate, ■...Catalyst support upper plate, ■...Catalyst layer, 0...
Heating tube, ■... Partition plate, ■... Wire mesh, @... Support stand, ■... Catalyst delivery hole, [Phase]... Wire mesh, [Phase]
... Sleeve No. +1 fi

Claims (1)

[Claims] In a methanol decomposition reactor having a structure in which a catalyst is packed outside a heating tube, there is a catalyst support plate provided in multiple stages at the end of the catalyst layer and a low pressure drop gap stretched between the steps of the catalyst support plate. 1. A methanol decomposition reactor, characterized in that it is equipped with a vapor distribution mechanism consisting of members.