JPS59199502A - Device for reforming - Google Patents

Abstract

PURPOSE:To make a compact device for reforming with high reforming efficiency, by burning fuel in the presence of a combustion catalyst packed between the reforming pipes to react a mixed fluid of hydrocarbons with steam in the presence of a catalyst and a casing. CONSTITUTION:Hydrocarbons are blended with steam, reacted with it in the presence of the reforming catalyst 2, and a given number of the reforming pipes 3 to convert the mixture into a gas containing at least hydrogen are set in the casing 1 to constitute the titled device for reforming. A mixture of the combustion catalyst 7 and the heat accumulative material 8 is packed between the casing 1 and the reforming pipes 3, to form the heat accumulative layer 9. A gaseous fuel and air for combustion are introduced from the feed opening 10 for fuel to the device, the fuel is burned in the presence of the catalys 7, the pipes 3 are heated, and the combustion gas 11 is exhausted from the exhaust vent 11. While the hydrocarbons and steam are fed from the feed header 4 for raw material through the valve 5 to the pipes 3, and prepared reformed gas is taken out from the header 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves mixing hydrocarbons such as fuel oil, engine fuel, naphtha, and natural gas with water vapor, and reacting this mixed product in the presence of a catalyst to purify at least an aqueous system. The present invention relates to a reforming device 6 for converting into a gas containing gas.

Since the above-mentioned reaction is an endothermic reaction, it is necessary to supply heat from the outside in order for the reaction to proceed. Therefore, conventionally, a reaction tube (with a diameter of 1100 yn to 1
A large number of burners (14'j) were attached to a casing housing a plurality of burners (about 8 m to 15 m in length), and combustion heat from the burners was supplied to the reforming catalyst layer. However, this structure has the disadvantage that the device becomes large, has poor heat supply efficiency, and cannot cope with rapid startup or rapid load changes.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a compact reforming device with high reforming efficiency.

In order to achieve this object, the present invention installs a predetermined number of reaction tubes filled with a reforming catalyst inside a casing, loads a combustion catalyst between the reaction tubes and the casing, and provides a fuel supply port in the casing. and a combustion gas exhaust port.

Next, embodiments of the present invention will be described with reference to the drawings. 11d&
It is a schematic block diagram of a C1 reformer.

A predetermined number of reforming reaction tubes 3 each containing a reforming catalyst 2 made of a nickel-based alloy to which molybdenum, cobalt, or the like is added, for example, are installed in the casing 1 . Each reaction tube 3
The upper part is connected to the raw material supply header 4 via the adjusting pulp 5, and the lower part is connected to the produced gas goo 6.

Between the casing 1 and the reaction tube 3 is filled a mixture of a combustion catalyst 7, such as iron-based, vanadium-free, or platinum-based, and a heat-reducing material 8, such as alumina-based or silicon carbide ceramic. A heat storage layer 9 is formed. Burn'I3"
1. (The mixing ratio of the redundant medium 7 is determined by its material etc.
For example, the mixing ratio can be set to ~70 LflS amount%. The casing IK is provided with a fuel supply port 10, a combustion gas exhaust 1'' 11, and a starting burner 12.

The gaseous fuel supplied together with the combustion air from the VC fuel supply port 10 to the heat storage layer 9 containing gas is combusted in the presence of the combustion catalyst 7, and due to the combustion heat, the reaction tube 3
Heated to 0-1000°C. The composition of the heat storage layer 8 prevents localized fuel abnormalities and maintains the heat within the casing 1 almost constant, allowing rapid startup.

Hydrocarbons and steam as raw materials are supplied to each reaction tube 3 from a raw material supply header 4 through a valve 5 at a temperature ranging from room temperature to 500°C. As described in niJ, the reaction tube 3 is maintained at a temperature KM suitable for the reforming reaction by heat supply from the heat storage layer 9, so the reaction proceeds smoothly, and the reformed body produced is transferred from the produced gas header 6. taken out.

In order to cope with rapid load fluctuations, the valves 5 are preferably electromagnetic valves that can individually and automatically adjust their opening degrees. Moreover, if the heat storage layer 9 and the burner 12 are used together as in this embodiment, rapid startup becomes even easier.

FIG. 2 shows an example in which this reformer is combined with a fuel cell. A mixture of the hydrocarbon system 14 and steam 15 is supplied to the reaction tube 3 of the reformer 13 as described above to perform a reforming reaction, and the generated reformed gas is sent to the cathode 17 of the pond 16 as fuel. Supplied as. On the other hand, part of the air 19 is stored in the heat storage layer 9 of the reformer west 13 as combustion air, and the rest is stored in the fuel cell 1.
6 anodes 18, respectively. It 44j l
Since the gas emitted from 7 contains unreacted (unburned) components, the gas is mixed with combustion air and sent to the reformer if 1.
It is supplied to the heat storage layer 9 of No. 3 and used efficiently.

In the present invention, the reaction +H, 4: 3 is in the form of a face), and even if there is a curved pipe such as a U-shape or a loop, ]・I4 does not occur.

The present invention has a 57':c configuration as described in f) iJ,
It is compact and provides good heat supply to the reforming reaction yarn, so high reforming efficiency can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sleep configuration diagram of the reformer N according to the example of "non-explosion," and FIG. 21 is a system F'C diagram of an example in which the reformer and a fuel cell are combined. 1... Casing, 2... Reforming catalyst,
3... Reforming reaction tube, 7... Combustion; Pumping medium, 8... Heat storage material, 10... Fuel supply port, 11... ...Fuel gas outlet, 13...
Reformer i′t, 14, ... hydrocarbon, 15.
...Water vapor-

Claims (1)

[Claims] 1. In a reforming device in which a reforming reaction tube for mixing hydrocarbons and steam and reacting the mixture in the presence of a catalyst to reform it into a gas containing at least hydrogen is disposed within the casing, before the reforming reaction. and the casing, a combustion catalyst is loaded therein, and the casing is provided with a fuel supply port and a combustion scum discharge port.