JPS61106401A - Reforming apparatus - Google Patents

Abstract

PURPOSE:To realize uniform temp. distribution in the whole circumferential direction in the inside of a furnace body contg. plural catalyst tubes packed with a reforming catalyst by providing helical guiding plates along the inside wall of the furnace body. CONSTITUTION:A reforming apparatus comprises a furnace body constituted of a cylindrical external cylinder 2 and an internal cylinder 1, housing plural catalyst tubes 4 packed with a reforming catalyst 3 in the space between the external cylinder 2 and the internal cylinder 1. Helical guiding plates 9 are provided along the inside wall of the external cylinder 2. Heat medium fed to the furnace body from below rises upward while swirling in the circumferential direction. Thus, dispersion of temp. in the circumferential direction of each catalyst tube 4 is eliminated, and heat exchange rate from the heat medium to the catalyst tube is improved.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] 1. Field of the Invention The present invention relates to, for example, a charging battery power generation system.

More specifically, the present invention relates to a reforming apparatus that can improve the rate of thermal energy exchange, effectively utilize the thermal energy, and reduce the temperature distribution of the apparatus.

[Prior art and its problems]

In order to improve efficiency and save energy in various plants, it is important to improve the exchange efficiency of energy, especially thermal energy, and use it effectively. For example, fuel that uses hydrogen as a raw material for power generation. In batteries, in order to improve economic efficiency, the exhaust gas from the anode is used as heating fuel in the reformer. As a conventional concrete reformer, the structures shown in FIGS. 3 and 4 are known. That is, the reformer 1o has an inner cylinder 1. which is a ventilation guide. It consists of an outer cylinder 2 which is a furnace body and a catalyst tube 4 which is filled with a reforming catalyst 3, and combustion gas which is a heat medium is supplied by a burner 5 in the inner cylinder. The combustion gas flows down the inside of the inner cylinder toward the bottom lζ in the figure, returns to the upper side of the bottom tube plate 6, and rises between the inner and outer cylinders. During the ascent, the thermal energy of combustion is transferred from the gas to the catalyst tubes, and this energy is used as reforming energy. After energy exchange,
The combustion gas is discharged to the outside from the upper gas discharge lower via the discharge pipe 8.

In such devices, it is possible to improve the conversion efficiency of thermal energy by applying conventionally well-known means. It is possible to increase the heat transfer area by increasing the heat area, adding fins to the catalyst tube, or making it a pleated bamboo tube. It is also conceivable to provide a baffle plate between the inner and outer cylinders in a direction perpendicular to the gas flow rate to disrupt the flow of combustion gas and improve the heat transfer characteristics from the gas to the catalyst tube. However, according to the above-mentioned means, although the efficiency of heat exchange for each catalyst tube increases, it is impossible to raise the temperature uniformly throughout. In fact, unevenness of the device due to manufacturing, that is, the center of the inner cylinder and the outer cylinder do not match, the inner cylinder is eccentric or tilted, or the part near the waste gas outlet and the other part There is a difference in the flow rate of combustion gas between the two parts, and it is extremely difficult to achieve an equal temperature in all catalyst tubes.According to experiments, even when the temperature is in a steady state, there are tubes with high temperature and tubes with low temperature. In a tube, there is a difference of 100°C or more in the distribution in the circumferential direction.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a reformer that can eliminate the above-mentioned drawbacks and realize a uniform temperature distribution throughout the circumferential direction inside the furnace body.

[Key points of the invention]

In this invention, a spiral guide plate is provided along the inner wall of the furnace body, and the heating medium is raised or moved inside the furnace body while swirling in the circumferential direction.

The purpose is to eliminate variations in temperature in the circumferential direction of each catalyst tube and to increase the overall heat exchange efficiency from the heat medium to the catalyst tubes.

[Embodiments of the invention]

Embodiments of the present invention are shown in FIGS. 1 and 2. FIG.

Note that the same components as in FIGS. 3 and 4 are given the same reference numerals, and their explanations are omitted. Reference numeral 9 denotes a guide plate provided so that the combustion gas spirals up, that is, rises while turning in the circumferential direction. Outer cylinder diameter 250
In a small reformer 20 with an inner cylinder diameter of 150 mm and a catalyst tube diameter of 201 EI, if the guide plate 9 is provided so that the combustion gas rotates three times before reaching the exhaust section, the heat transfer coefficient will be approximately doubled. become.

Also, before installing the guide plate, the temperature difference in the circumferential direction was 100
℃ or more, but by providing a guide plate, the temperature difference in one circumferential direction became about 20℃.

In addition, when a multi-stage reaction is carried out using a catalyst, for example, in steam reforming of methanol, the first stage of methanol decomposition is an endothermic reaction that consumes energy, and the second stage of the reaction between CO and H2O consumes energy. releases energy in an exothermic reaction.

In such a case, a lot of heat energy is transferred at the bottom of the catalyst tube 4. I want to be seven. In this case, more effective use of thermal energy can be achieved by providing a guide plate that spirals up only in the portion where the amount of heat transfer is desired to be increased.

〔Effect of the invention〕

As is clear from the above explanation, by providing a spiral guide plate along the inner wall of the furnace body, the multiple catalyst tubes are heated uniformly, and the temperature distribution in the circumferential direction of the tubes is small. Become. As a result, the reaction rate of the catalyst becomes uniform, and the amount of reactants supplied to each reaction tube becomes uniform. In addition, extreme overload on a portion of the catalyst can be avoided, and the life of the catalyst as a whole can be extended.

[Brief explanation of drawings]

Figures 1 and 2 are a plan sectional view and a side sectional view showing only the outer cylinder cut away vertically, respectively, showing an embodiment of the present invention, and Figures 3 and 4 are respectively a conventional reformer. FIG. 1 is a plan sectional view and a side sectional view showing a reforming device. 1; Inner cylinder, 2; Outer cylinder, 3: Reforming catalyst, 4; Catalyst tube, 5
burner, 6; bottom tube plate, 7; gas outlet, 8; discharge pipe, 9; guide plate, 11; mesh plate, 20; reformer. Ya III! talented J figure

Claims (1)

[Claims] In a reforming device in which a plurality of catalyst tubes filled with a reforming catalyst are provided inside a cylindrical furnace body, and a heat medium is supplied from below the furnace body, a spiral shape is formed along the inner wall of the furnace body. A reforming device characterized by being provided with a guide plate.