JPS5945902A - Apparatus for reforming hydrocarbon fuel - Google Patents

Abstract

PURPOSE:To utilize the heat dissipated from a heater and the heat of the reforming reaction, effectively by attaching an inlet of a mixed gas to the lid for the exchange of the reforming catalyst and placed opposite to the heater. CONSTITUTION:The inlet 9 of a mixed gas is attached to the lid 6 for the exchange of a reforming catalyst and placed opposite to the heater 12 for heating the reforming catalyst. The reforming catalyst 11 is heated with the ceramic heater 12 at about 700-900 deg.C, and a gaseous mixture composed of hydrocarbons, water, air, etc. is introduced into the reactor through the inlet 9. The mixture is preheated by the radiation heat from the heater 12, transferred through the path 19 formed by the outer tube 2 and the intermediate tube 3 and the path 20 formed by the intermediate tube 3 and the inner tube 4, and introduced via the heater 12 into the reforming catalyst 11. The mixed gas can be reformed to inorganic gas composed mainly of hydrogen and carbon dioxide gas by this process, and the reformed gas is recovered from the outlet 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention involves mixing hydrocarbons with water or steam, or partially with air, and passing the mixture through a reforming catalyst to convert it into inorganic gases mainly consisting of hydrogen and carbon dioxide. The ratio of the modification is small (ν
The present invention relates to a hydrocarbon fuel reformer.

Structure of conventional examples and their problems Conventional hydrocarbon fuel reformers are mainly used for large-scale plants, and there are few examples of those for home use or small-scale industries. This is a method of indirectly heating the reforming catalyst by providing a heater around the outer circumference of the reforming catalyst.

In this case, uneven humidity tends to occur between the center and the outer circumference of the reforming catalyst body. This problem can be solved by creating multiple peaks evenly spaced in the reaction tube close to the front of the reforming catalyst, but the heat dissipated from the front of the reaction tube is large and the heat from the heater cannot be used sufficiently. The drawback was that it was difficult to use.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides a hydrocarbon tl The purpose is to provide a reforming device.

Structure of the Invention In order to achieve the above object, the hydrocarbon fuel reformer of the present invention comprises a reaction tube composed of multiple tubes, at least the inner surface of the inner tube being made of a heat-resistant inorganic material such as alumina or silica. A reforming catalyst body provided with a cylindrical body, supplying the mixture from the outermost passageway of the reaction tube, and facing a heater for heating the reforming catalyst body through the mixture supply pipe. This is a configuration that is installed on a replacement lid.
It is also possible to sufficiently preheat the radiation from the heater that heats the reforming catalyst body.

Further, by providing the air-fuel mixture supply port in the reforming catalyst replacement lid provided opposite the heater, it is possible to prevent heat radiation from the front part of the reaction tube.

Description of examples Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, 1 is a metal reaction tube, and this reaction tube 1 is composed of a triple tube including an outer tube 2, a middle tube 3, and an inner tube 4. This inner tube 3 is fixed to a lid 6 by a support A5, and further this lid 6 is attached to the outer tube 2 with bolts 8 via a packing 7 made of a heat insulating material. Reference numeral 9 denotes a supply pipe provided in the center of the lid 6, through which a mixture of hydrocarbons and air, water, or steam is supplied in advance. Reference numeral 10 denotes a cylindrical body provided on the inner surface of the inner tube 4, and this cylindrical body 1o is made of a heat-resistant inorganic material such as alumina or silica. Reference numeral 11 denotes a reforming catalyst body provided inside the cylindrical body 1o. This reforming catalyst body 11 is made of a heat-resistant inorganic material of α゛-alumina cordierite 4:9, and has a honeycomb or lattice-like cross section. It is constructed by supporting an oxidation catalyst such as nickel or cobalt on a thin-walled cylindrical carrier. Reference numeral 12 denotes cylindrical ceramic heaters that are close to the downstream side of the body 11 during reforging and are attached to the supports B13 of the middle tube 3 at approximately equal intervals.

A thermocouple 14 detects the temperature of the reforming catalyst body 11, and lead wires 15 and 16 between the thermocouple 14 and the ceramic heater 12 are led out to the front surface of the lid 6. 17
is an outlet for taking out the produced Ganu produced as a result of the reforming reaction.

Hereinafter, the operation in the above J'f7i formation will be explained.

The reforming catalyst body 11 is heated by a ceramic heater 12.
After being preheated to 700 to 900°C, a mixture of hydrocarbons and water, air, or steam is supplied from the supply pipe 9. The air-fuel mixture supplied from the supply pipe 9 is blown onto the bottom 18 of the middle pipe 3, absorbs the radiant heat from the ceramic heater 12, passes through the passage A19 formed by the outer pipe 2 and the middle pipe 3, and flows into the middle pipe. It is supplied to the reforming catalyst body 11 from the cylindrical ceramic heater 12 provided on the support B13 through a passage B20 formed between the tube 3 and the inner tube 4. Then, the produced Ganu that has been reformed into components mainly consisting of hydrogen and carbon dioxide in the reforming catalyst body 11 is stored in a gas reservoir through the take-out port 17, and can be taken out as needed.

Next, an example will be shown in which partial oxidation of methane was performed using the hydrocarbon fuel reformer according to this embodiment.

Reaction conditions Air-fuel ratio (Air/c) 1.2 Preheating temperature of reflowing catalyst 800℃ Space velocity (S, V,
) 14000 result is 100% gasification rate
Therefore, a hydrogen composition ratio of 30% was obtained. Furthermore, even if the operation of the ceramic heater 12 is stopped after the reaction, the
The self-combustion reaction continued at C.

The hydrocarbon fuel reformer of this embodiment has a cylindrical body 1 made of a heat-resistant inorganic material such as alumina on the inner surface of a metal inner tube 4.
By installing o, heat dissipation due to radiation from the ceramic heater 12 can be suppressed, and furthermore, the reaction tube 1
By making the ceramic heater 12 a triple tube structure,
It becomes possible to fully preheat the mixture of hydrocarbons and water or air by effectively utilizing all the heat of the gas.

By spraying a mixture of hydrocarbon and water or air to the rear of the ceramic heater 12, heating of the front of the reaction tube 1 can be suppressed.

As described above, according to the hydrocarbon fuel reformer of this embodiment,
Even if the reforming catalyst body 11 is used for a long period of time and carbon accumulates on the surface and the activity of the reforming catalyst body 11 deteriorates, the ceramic heater 12 can be installed together with the lid 6 by removing the lid 6 from the outer tube 2. Since the inner tube 3 can be pulled out, the reforming catalyst body 11 housed in the inner tube 4 can be easily replaced.

In addition, by blowing the air-fuel mixture supplied from the supply pipe 9 onto the bottom part 18 of the middle pipe 3, radiant heat from the ceramic heater 12 is absorbed, and the passage A191 and the passage B2
During the supply from the cylindrical ceramic heater 12 to the reforming catalyst body 11 via the cylindrical ceramic heater 12, the heat generated by the reforming reaction can be used for sufficient preheating, making the reaction tube 1 unnecessary.
Second, temperature rise is prevented.

By embedding the elements constituting the ceramic heater 12 in the cylindrical ceramic, it is possible to prolong the life of the ceramic heater 12.

According to the hydrocarbon fuel reformer of the present invention, as described above, the effects of the invention are as follows.
The heat dissipated from the heater and the heat of the reforming reaction can be used effectively, and as a result, the preheating time of the reforming catalyst body is shortened, resulting in energy savings, as well as partial oxidation by mixing air with hydrocarbons. In this case, the effect is obtained that a stable reforming reaction can be performed without operating the heater.

[Brief explanation of drawings]

The figure is a side sectional view of a hydrocarbon fuel reformer showing one embodiment of the present invention. 1...Reaction tube, 4...Inner tube, 6...
... Lid, 9. River... Supply pipe, 1o... Cylindrical body, 11... Reforming catalyst body, 12...
...Ceramic heater (heater), 20...
Aisle person.

Claims (2)

[Claims] (1) A hydrocarbon fuel reformer that reforms a mixture of hydrocarbons with water, air, or steam through a reforming catalyst heated by a heater to reform it into inorganic gases mainly consisting of hydrogen and carbon dioxide. A cylindrical body made of a heat-resistant inorganic material such as alumina or silica is disposed on the inner surface of at least the innermost inner tube of a reaction tube composed of multiple tubes made of metal such as iron or nickel. The air-fuel mixture is supplied from the outermost passage of the pipe, and the air-fuel mixture supply pipe is provided in a lid for replacing the reforming catalyst body provided opposite to the heater that heats the reforming catalyst body. hydrocarbon fuel reformer. (2) The reforming catalyst body is made of a heat-resistant inorganic material such as α-alumina or cordierite, and has a configuration in which the oxidation catalyst is supported on a rectangular or cylindrical carrier with a thin wall such as a honeycomb or lattice cross section. Claim No. 1
Hydrocarbon fuel reformer as described in Section.