JPH0645441B2 - Reformer - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention provides a reformed gas by steam reforming a raw material gas by flowing a high temperature combustion gas to the outside of the reforming tube to heat the reforming tube. The present invention relates to improvement of a reformer.

[Technical Background of the Invention] FIG. 2 is a cross-sectional view showing an example of the configuration of a conventional double-tube reformer. In the figure,
Reference numeral 1 is a reformer vessel, 2 is a reforming tube having an annular cross section in which one end (upper end) is sealed and a reforming catalyst layer 3 is provided between an inner pipe line and an outer pipe line. A plurality of reforming tubes 1 are arranged side by side inside the reformer container 1. Combustion air and combustion gas are introduced into a combustion burner nozzle 6 as a combustor from a combustion air inlet pipe 4 and a combustion gas inlet pipe 5 attached to the upper part of the reformer vessel 1, respectively. The reforming tube 2 is heated by burning and the high temperature combustion gas obtained thereby passing through the heat transfer packing layer 9 provided on the outer plate 8 of the reforming tube 2, and thereafter the high temperature combustion gas is heated. Is discharged from the exhaust gas outlet pipe 10 to the outside of the reformer container 1. On the other hand, the raw material gas is introduced into the reforming catalyst layer 3 provided inside the reforming pipe 1 through the raw material gas inlet pipe 11 together with the steam, and the raw material gas is heated in the reforming catalyst layer 3 to form the reformed gas. The generated gas is inverted at the top 12 of the reforming tube and heats the reforming catalyst layer 3 while descending the return path 13 to lower the temperature, and then the reforming gas outlet pipe 14 is used to reform the reformer vessel 1. It is discharged to the outside. Further, the other ends (lower ends) of the plurality of reforming tubes 2 are attached to a tube sheet 15, and the tube sheet 15 is provided with a support stand 17 provided on the reformer container 1 via a heat insulating material 16. Installed on. Further, a heat insulating layer 18 is provided between the reformer vessel 1 and the heat transfer filling layer 9 which is a passage for the high temperature combustion gas to keep the heat therein. Here, as the heat insulating material of the heat insulating layer 18, it is conceivable to use various materials such as brick, ceramic wool, glass wool, etc., but especially when the starting and stopping of the reforming device is complicatedly performed. However, bricks cannot be used because they tend to crack, and ceramic wool materials are mainly used. Reference numeral 19 is a packed bed cylinder provided around the heat transfer packed bed 9.

[Problems of Background Art] In the reformer having such a configuration, the combustion air inlet pipe 4 and the combustion gas inlet pipe 5 through the combustion burner nozzle 6 are used.
When the combustion air and the combustion gas are introduced into the combustion chamber 7 and are burned in the combustion chamber 7 to obtain the high temperature combustion gas, the combustion gas does not completely burn and an unburned portion of the combustion gas appears or is incomplete. Since combustion exhaust gas containing a large amount of NOX, which is generated by combustion, is generated, when the combustion exhaust gas is released into the atmosphere, it causes a pollution problem. Further, since the combustion gas is not completely combusted, there is a problem that the reforming efficiency of the entire reformer is lowered.

[Object of the Invention] The present invention has been made to solve the above problems, and its purpose is to completely burn combustion gas to obtain combustion exhaust gas without unburned components and NOX, and to solve pollution problems. An object of the present invention is to provide a reforming device capable of preventing the occurrence of the generation and performing the reforming with extremely high efficiency.

[Summary of the Invention] In order to achieve the above-mentioned object, in the present invention, a plurality of modified pipes having an annular cross section in which one end is sealed and a reforming catalyst layer is provided between an inner pipe and an outer pipe. A high-quality combustion gas obtained by arranging a quality pipe inside a reformer container, mixing combustion gas and combustion air by a combustor, and combusting in a combustion chamber formed inside the reformer container While flowing out from the other end through the heat transfer packed layer provided outside the one end, the raw material gas is introduced from the other end of the reforming tube to form the reformed gas through the reforming catalyst layer, and one end thereof In a reformer configured so as to flow from the other end through the inner pipe from the other end, at least a portion near the heat transfer filling layer is formed of a porous member and a combustion catalyst is stored inside Part inside the reformer container and burning A combustor is embedded in the combustion catalyst of the catalyst storage unit, and one end of each is connected to the outside of the reformer container and the other end is connected to the combustion catalyst storage unit, and the combustion catalyst is supplied to and discharged from the combustion catalyst storage unit. A combustion catalyst supply pipe and an exhaust pipe are provided.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention shown in the drawings will be described below.
FIG. 1 is a sectional view showing a structural example of a reforming apparatus according to the present invention. The same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. Here, only different points will be described. explain. That is, in FIG. 1, at least the portion in the vicinity of the heat transfer filling layer 9 is formed from the conical plate 20 that is a porous member, and the combustion catalyst 21 is housed therein as a combustion catalyst housing portion. A case 22 is provided above the inside of the reformer container 1, and the combustion catalyst 2 of the case 22 is provided.
The combustion burner nozzle 6 is embedded in the nozzle 1. Also,
A combustion catalyst supply pipe 23 whose one end communicates with the outside of the reformer container 1 is connected to the upper portion of the case 22, and a combustion catalyst discharge pipe 24 whose one end communicates with the outside of the reformer container 1 is connected to the lower portion thereof. The combustion catalyst is connected and connected to the case 22 so that the combustion catalyst can be supplied and discharged, respectively. Further, a catalyst supply valve and inlet valves 25 and 26 are provided on the combustion catalyst supply pipe 23, respectively, and a catalyst discharge valve 27 is provided on the combustion catalyst discharge pipe 24. In the above description, the plate 20 is made of a heat-resistant material such as alumina capable of withstanding high temperatures, and the combustion catalyst 21 is made of catalyst particles obtained by adhering platinum or the like to alumina or ceramic.

In the reformer having such a configuration, the portion near the heat transfer packed layer 9 is formed from the mesh 20, and the combustion catalyst 2 is provided inside.
By embedding the combustion burner nozzle 6 in the combustion catalyst 21 of the case 22 that accommodates 1, the combustion gas and the combustion air are combusted in the combustion catalyst 21, and the high temperature combustion gas obtained by this burns out. It will flow from 20 to the external combustion chamber 7. As a result, since the combustion gas can be completely combusted, the unburned content of the combustion gas as in the prior art or the generation of combustion exhaust gas with a large amount of NOX generated due to incomplete combustion does not occur. It is possible to prevent the occurrence of pollution problems even when the air is released into the atmosphere. Further, since the combustion gas is completely combusted, it is possible to perform reforming with extremely high efficiency. Further, a combustion catalyst supply pipe 23 is connected to the upper portion of the case 22 and a combustion catalyst discharge pipe 24 is also connected to the lower portion thereof so that the combustion catalyst can be supplied to and discharged from the case 22, respectively. Therefore, when the combustion catalyst 21 is less effective as a catalyst due to long-term use, the catalyst discharge valve 2 provided on the combustion catalyst discharge pipe 24 is provided.
7 is opened to discharge the combustion catalyst 21 in the case 22 to the outside, and the catalyst supply valve 25 and the inlet valve 26 provided on the combustion catalyst supply pipe 23 are opened to the same amount as the amount discharged from the outside. It is possible to supply fresh combustion catalyst in quantity or equivalent. As a result, a new combustion catalyst can be sequentially replaced in the device and used for reforming, so that the combustion catalyst can be replaced easily and during operation, and the device life can be extended. Becomes
Furthermore, by heating the combustion catalyst 21 with the torch when the combustion is first started in the reformer, there is an advantage that ignition can be easily performed.

Incidentally, in the above-mentioned embodiment, the perforated plate was used as a part of the combustion catalyst housing portion, but the present invention is not limited to this. It ’s good.

[Effects of the Invention] As described above, according to the present invention, at least the portion in the vicinity of the heat transfer filling layer is formed of the porous member, and the combustion catalyst storage portion in which the combustion catalyst is stored is provided in the reformer container. A combustor is provided inside and the combustion catalyst is embedded in the combustion catalyst of the combustion catalyst storage portion. Further, one end of the combustion catalyst storage portion is connected to the outside of the reformer container and the other end of the combustion catalyst storage portion is connected to the combustion catalyst storage portion. Since the combustion catalyst supply pipe and the exhaust pipe for supplying and discharging the combustion catalyst are provided, the combustion gas is completely burned to obtain the combustion exhaust gas having no unburned components and NOx, thereby preventing the occurrence of pollution problems. At the same time, it is possible to provide a highly reliable reforming device that can perform reforming with extremely high efficiency and that can easily replace the combustion catalyst during operation.

[Brief description of drawings]

FIG. 1 is a cross sectional view showing an embodiment of the present invention, and FIG. 2 is a cross sectional view showing the structure of a conventional reformer. 1 ... reformer container, 2 ... reforming tube, 3 ... reforming catalyst layer,
4 ... Combustion air inlet pipe, 5 ... Combustion gas inlet pipe, 6 ...
Combustion burner nozzle, 7 ... Combustion chamber, 8 ... Eye plate, 9 ...
Heat transfer packed bed, 10 ... Exhaust gas outlet pipe, 11 ... Raw material gas inlet pipe, 13 ... Return path, 14 ... Reformed gas outlet pipe, 15 ... Tube plate, 16 ... Heat insulating material, 18 ... Heat insulation layer (low temperature heat insulation layer), 19 ... Packed bed cylinder, 20 ...
21 ... Combustion catalyst, 22 ... Case, 23 ... Combustion catalyst supply pipe, 24 ... Combustion catalyst discharge pipe, 25 ... Catalyst supply valve, 26 ... Inlet valve, 27 ... Catalyst discharge valve.

Claims (1)

[Claims] 1. A plurality of reforming pipes each having an annular cross section, one end of which is hermetically sealed and a reforming catalyst layer is provided between an inner pipe and an outer pipe. The high-temperature combustion gas obtained by mixing the combustion gas and the combustion air with the combustor and combusting the mixture in the combustion chamber formed inside the reformer container is provided outside one end of the reformer pipe. The raw material gas is made to flow out from the other end through the heat transfer packed layer, and the raw material gas is made to flow in from the other end of the reforming pipe to form the reformed gas through the reforming catalyst layer and the other end is passed through the inner pipe line from the one end. In the reformer configured to allow more outflow, at least a portion near the heat transfer filling layer is formed of a porous member, and a combustion catalyst storage portion in which a combustion catalyst is stored is provided inside the reformer container. Is installed in the The combustor is embedded in the catalyst, and one end of the combustor communicates with the outside of the reformer container and the other end communicates with the combustion catalyst storage part, and the combustion catalyst is supplied to and discharged from the combustion catalyst storage part. A reforming device characterized in that a combustion catalyst supply pipe and an exhaust pipe are provided.