JPS603857B2 - reactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reactor, and particularly to a reactor suitable for a fuel cell reformer, which is compact and can be efficiently started by rapid heating.

BACKGROUND ART Conventionally, the following structure has been proposed as a reactor for heating gas supplied into a reaction tube from the outside of the reaction tube to carry out a predetermined reaction. In this reactor, a heating element made of a ceramic porous plate is provided around the outer periphery of a single reaction tube so as to surround the reaction tube, and the reaction tube is heated by the heat emitted by the heating element. Since the capacity of such a Korean single-tube reactor is small, a relatively large-capacity reactor with a large number of reaction tubes is required.

However, if the above-mentioned Hanji single-tube reactor itself is combined with silk, the equipment tends to become bulky, and it is not sufficient in terms of rapid startup due to rapid heating. For this reason, it has not been able to be sufficiently applied to a fuel cell teaching device that is compact and requires conditions such as rapid start-up. An object of the present invention is to provide a reactor that has a compact structure and can efficiently heat a reaction tube rapidly.

The present invention has a compact structure in which a plate-shaped heating element is arranged, without arranging a heating element (porous ceramic plate) around the entire outer periphery of the reaction tube, and a catalyst is supported on the surface of the heating element. Aiming for complete combustion of the air-fuel mixture,
This enables rapid startup, etc.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a fuel cell reformer showing an embodiment of the present invention.

In the figure, a large number of reaction tubes 2 are arranged in a row in the center of a rectangular cylindrical reformer main body 1 made of a heat insulating material. Each of these reaction tubes 2 is provided with two fins 3 parallel to the inner wall surface of the reformer main body 1 along the tube axis direction. The outer peripheral end surfaces of the fins 3 provided in each reaction tube 2 are spaced apart from each other by a predetermined interval. Further, heating elements 4 are arranged on both sides of the reaction tubes 2 arranged in a row, and a combustible mixture chamber 5 is provided between these heating elements 4 and the inner wall surface of the converter main body 1. In addition, in the figure, each reaction tube 2 has a The fins 3 are arranged parallel to the inner surface of the heating element 4. The heating element 4 is made of a ceramic porous plate, and a combustion catalyst is supported on the plate surface including the inner surface of the holes.

As a combustion catalyst, platinum (Pt), palladium (Pd)
, stainless steel is used. One end of each reaction tube 2 is also connected to a gas supply header 7 via a distribution pipe 6, and the other end of each reaction tube 2 is connected to a produced gas header 9 via a discharge pipe 8.

The combustible mixture chamber 5 is connected to a fuel gas header 11 via a fuel supply pipe 10, and the fuel supply pipe 10 is connected to an air supply pipe 11.
is connected to the fuel air header 12 via the fuel air header 12. Furthermore, the heating chamber 13 surrounded by the heating element 4 is communicated to the outside of the reforming furnace via a fuel gas exhaust port 14. In such a fuel cell reformer, a reaction gas, which is a raw material for reforming, is supplied into each reaction tube 2 from a raw material supply header 7 via a distribution pipe 6.

On the other hand, the fuel gas is supplied from the fuel gas header 11 to the fuel supply pipe 1.
Combustion air is supplied to the combustible mixture chamber 5 via the combustion air header 12 and the air supply pipe 11 to the combustible mixture chamber 5 . The combustible mixture thus obtained comes into contact with the combustion catalyst supported on the heating element 4 and burns, thereby heating the heating element 4. Here, as the heating element 4, the fourth
Examples include a honeycomb-shaped porous body 4A shown in the figure or a perforated plate 4B shown in FIG. good. The reaction tube 2 is heated by heat transfer from the heated heating element 4, and the reaction gas supplied to the reaction tube 2 becomes a noble gas by the reforming catalyst filled in the reaction tube 2.

This reformed gas is introduced into a produced gas header 9 via a discharge pipe 8. The combustion gas in the heating chamber 13 is discharged from the combustion gas exhaust row 4.
It is then released outside the furnace. In the above-mentioned Korean heat transfer system, as shown in Fig. 6, the circular reaction tube 2 is
When the reaction tube 2 is placed between two plate-shaped heating elements 4, the closer the reaction tube 2 is to the heating element 4, the more the radial intensity distribution (heat flux distribution) becomes elliptical. It is not possible to heat the surrounding area evenly.

However, when the reaction tube 2 is provided with fins 3 as shown in FIG. 7 (this example), the key radiation heat from the heating element 4 is first provided by the fins 3, and then the reaction is caused by heat conduction from the fins 3. Since the tube 2 is heated, the reflection intensity distribution becomes circular, so that the outer periphery of the reaction tube 2 can be heated uniformly. In the above embodiments, a fuel cell reformer was particularly described, but in the present invention, a reactor is a reactor that can carry out a predetermined reaction by heating the gas inside the reaction tube from the outside of the tube. can also be applied.

As described above, according to the present invention, the device structure can be made compact, and the catalyst supported on the outer surface of the heating element can achieve complete combustion of the combustible mixture. can be argued against.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a fuel cell recycler showing an embodiment of the present invention, Fig. 2 is a perspective view of the main part of Fig. 1, and Fig. 3 is taken along line A-A in Fig. 1. A cross-sectional view, FIG. 4 is an explanatory diagram showing an example of the heating element in the present invention, FIG. 5 is an explanatory diagram showing another example of the heating element in the present invention, and FIG. 6 is a diagram showing the radiation intensity in the fin-brewing reaction tube. A diagram showing the distribution, FIG. 7 is a diagram showing the firing intensity distribution in a finned reaction tube. 1...Reformer main body, 2...Reaction tube, 3
...Fin, 4...Heating element, 5...
...Flammable mixture chamber, 6...Distribution pipe, 7...
...Raw material supply header, 8...Discharge pipe, 9...
...Produced gas header, 10...Fuel supply pipe, 11...Air supply pipe, 12...Combustion air header, 13...Heating chamber, 14... Combustion exhaust gas port n Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] 1. A large number of reaction tubes are arranged in a substantially planar manner in the furnace main body,
A ceramic perforated plate carrying a catalyst is disposed on the plate surface including the inner surface of the pores in close proximity to these reaction tubes, and a combustible mixture chamber is provided which is formed by the ceramic perforated plate and the inner wall surface of the furnace main body. A reactor characterized by: 2. The reactor according to claim 1, wherein each of the plurality of reaction tubes has fins attached along the axial direction of each tube. 3. The reactor according to claim 2, wherein the fins are provided in each reaction tube so as to be parallel to the inner surface of the porous ceramic plate. 4. The reactor according to claim 1, 2, or 3, wherein the reactor is a fuel cell reformer.