JPS625223Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a catalytic combustion type reaction device, and more particularly to a catalytic combustion type reaction device in which hydrocarbons and the like are heated and reacted in a cylindrical reactor filled with a combustion catalyst.

An example of a conventional catalytic combustion device is shown in FIG. This device is related to a reforming reaction of hydrocarbons, and includes an outer cylinder 5 filled with a combustion catalyst 6 and a reforming reaction catalyst 2.
It consists of an inner cylinder 3 filled with Hydrocarbons and steam are introduced from the upper inlet 1 of the inner cylinder 3, and produced gas is obtained from the lower outlet 8. Further, fuel and air are supplied from the upper fuel inlet 4 of the outer cylinder 5, and combustion waste gas is discharged from the lower outlet 7. fuel inlet 4
The fuel and air supplied from the outer cylinder 5 are combusted in a layer of combustion catalyst 6 filled inside the outer cylinder 5, and the heat is transferred to the reforming reaction part of the inner cylinder 3, where hydrocarbons and steam are heated. The gas produced after the reaction and reforming reaction is discharged from the outlet 8. The temperature distribution of the above reactor is shown in FIG. 2, and it can be seen that most of the fuel is combusted near the inlet of the combustion catalyst layer, causing a rapid temperature rise. In this way, in the conventional reactor, (1)
It is difficult to control the rate of supply of heat required in the reforming reaction, (2) it is necessary to use high-grade heat-resistant materials in the rapid heat generation section, (3) the combustion catalyst is only effective in the heat generation section, There are drawbacks such as the fact that the catalyst packed in the lower catalyst layer is not utilized.

The purpose of this invention is to provide a catalytic combustion reactor that allows combustion to occur uniformly within the catalyst layer by slowing down the combustion rate as a whole without causing sudden combustion of the fuel supplied to the combustion catalyst layer. It is in.

In order to achieve the above object, this invention is characterized in that heat-resistant granules (typically alumina balls) are mixed with the combustion catalyst in a reaction device filled with the combustion catalyst. In this idea, the mixing ratio of the combustion catalyst and the heat-resistant particulates is
A range of 1:1 to 1:5 (weight ratio) is suitable.
The diameter of the heat-resistant granules is preferably approximately 5 to 15 mm. Further, the method of filling the heat-resistant granules may be irregular packing or regular packing.

The heat-resistant granules are preferably ones that retain heat and have high heat resistance, such as those made of metal oxides such as alumina balls.

This invention will be explained in more detail below with reference to the drawings.

FIG. 3 is a sectional view showing an example of a reaction apparatus to which this invention is applied. In the figure, hydrocarbons and steam are supplied into the inner cylinder 3 from a raw material inlet 9, and are sent out from a generated gas outlet 10 after a reforming reaction. On the other hand, fuel and air are supplied from the fuel inlet 11, and are combusted in a packed bed 14 in which a combustion catalyst 12 and alumina balls 13 as heat-resistant granules are mixed, supplying reaction heat into the cylinder 3, and then exiting the exhaust gas outlet. It is discharged from 15. The temperature distribution inside the inner cylinder 3 in this example is shown in FIG. 4, and it is clear that the temperature distribution is uniform compared to FIG. 2.

As described above, according to this invention, in a reaction apparatus filled with a combustion catalyst, (1) it is possible to prevent a sudden temperature rise in the combustion section, (2) it is possible to control the supply ratio of reaction heat amount. (3) Since there is no sudden heat generation part and no abnormal high temperature is generated, the heat resistance performance of the constituent materials can be reduced. (4) The amount of combustion catalyst packed can be reduced because it is mixed with heat-resistant particulates. Effects such as being able to do this can be obtained.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional catalytic combustion reactor, Figure 2 is a diagram showing the temperature distribution of the combustion catalyst layer of the conventional reactor, and Figure 3 is an example of the reactor of this invention. FIG. 4 is a diagram showing the temperature distribution of the combustion catalyst layer of the reactor of this invention. 3... Inner cylinder, 9... Raw material inlet, 10... Produced gas outlet, 11... Fuel inlet, 12... Combustion catalyst,
13... Alumina ball, 14... Filled layer, 15
...Waste gas outlet.

Claims (1)

[Claims for Utility Model Registration] (1) A reactor having an outer cylinder filled with a combustion catalyst and an inner cylinder into which a reactant is supplied, in which heat-resistant particulates are mixed together with the combustion catalyst in the outer cylinder. A catalytic combustion reactor characterized by: (2) Claim 1 of the utility model registration claims a catalytic combustion reactor in which the reactants are hydrocarbons and steam. (3) Claims 1 or 2 of the utility model registration claim are characterized in that heat-resistant granules are regularly or irregularly mixed at a ratio of 1 to 5 to 1 of the amount of combustion catalyst. Catalytic combustion reactor.