JPH01317102A - Reforming apparatus - Google Patents

Abstract

PURPOSE:To suppress the heat loss from the surface of furnace and to uniformly heat the reaction tube by forming a combustion space between a reaction tube and a burner, dividing the space with flame guides to separate the reaction tubes from each other and pairing the reaction tube with the combustion space containing the burner. CONSTITUTION:The objective reforming apparatus for reforming a hydrocarbon fuel to a hydrogen-rich gas by steam-reforming is provided with ring-shaped reaction tubes 23... (composed of an inner tube 24, an intermediate tube 25 and an outer tube 26) acting also as a flow channel of combustion gas, combustion burners 27... (27a is burner nozzle) forming pairs with each of the above reaction tubes 23..., combustion spaces 32 formed between the reaction tubes 23 and the combustion burners 27 and flame guides 36... to devide the combustion space 32 corresponding to the reaction tube 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a reforming apparatus that uniformly heats a plurality of reaction tubes and is made smaller.

[Conventional technology]

FIG. 3 is a sectional view showing a conventional reforming device disclosed in, for example, Japanese Patent Application Laid-Open No. 60-103001, and FIG. 3 (4)
, @, (1) is the reforming furnace vessel, (2) is the filler layer heating section, (3) is the outer tube of the double catalyst tube, (4) is the refractory material,
(5) is the exhaust gas duct, (6) is the inner pipe of the double catalyst tube, (
7) is the burner, (8) is the air box, (9) is the flame-extinguishing rectifying grid, QQ is the mesh plate that holds the filler ((g) in Figure 4), and (II) is the combustion space. Although the exhaust gas is shown as having a vertical shape and flowing upward, and then turning around at the top and flowing downward, it may also be in the opposite shape or horizontal.

In FIG. 4, (3) indicates a catalyst tube, and (f) indicates a filler (a mineral material having a melting point of 1000 DEG C. or higher is used, and a particle size of, for example, 5 to 110 In is used).

Next, the operation will be explained.

The air supplied to the combustion air box (8) shown in Figure 3 is
Combustion space Oυ due to fuel injected from burner (7)
Burn at. The flame, which has become partially uniform and extends for a long time, is extinguished by the flame-extinguishing rectifying grid (9). After being rectified, the combustion gas changes its direction by 180 degrees and heads toward the filler layer heating section (2).

In the filler layer heating section, due to the filler (g), the gas flow rate of the combustion gas increases, ensuring good and uniform heat transfer.

After passing through the mesh plate (10), the combustion gas flows through the exhaust duct (5).
more excreted. The combustion space (B) is surrounded by a fireproof material (4), and the double catalyst tube is directly exposed to the flame due to the flame-extinguishing rectifier grid (9) and the filler material (to) that covers the top of the double catalyst tube. Therefore, the heat load received can be made uniform. Therefore, the safety of the double catalytic tube is increased and rapid startup is possible.

[Problem to be solved by the invention]

The conventional reformer is configured as described above, and since the combustion space (B) of each burner (7) is common, the combustion space (B)
Convection of combustion gas occurs within the furnace, resulting in large heat loss from the furnace surface.

This invention was made to solve the above-mentioned problems, and aims to provide an apparatus that suppresses heat loss from the surface of a furnace body and uniformly heats a reaction tube.

[Means to solve the problem]

In the apparatus according to the present invention, a combustion space provided between a reaction tube and a burner is separated for each reaction tube by a flame guide, and a pair of combustion spaces including the reaction tube and the burner are formed.

[Effect]

In the reformer according to the present invention, since the combustion space is limited by the flame guide, the space outside the flame guide has an adiabatic effect, and heat loss from the furnace body is reduced.

Further, the flame guide has a rectifying effect on combustion gas, and can uniformly heat a plurality of reaction tubes.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (c) is the reformer container, (b) is the container insulation material,
(to) is the reaction tube, (c) is the inner tube, ni) is the intermediate tube, ni) is the outer tube, ← is the burner, C27a) is the burner nozzle, ni)
is a fuel box, 翺 is an air box, (g) is a filling material, so is a mesh plate that holds the filling material Co, (b) is a combustion space, and a vessel is a burner). passing through the exhaust gas duct l-, (F) is the flame, (T) is the pilot burner for igniting the burner (A), and *X+6) is the flame guide.

The fuel supplied to the fuel M shown in FIG. 1 is mixed with air supplied from the air box (2) through the burner nozzle (27a) and combusted in the combustion space. At this time, since the burner nozzle (27a) is thin, the flame is short. Dozens of these burner nozzles (27a) are combined into one burner (goods).
form. For this burner), the inner pipe (goods) and the middle pipe (2)
, in the outer tube), in the reaction tube consisting of triple tubes), and in the lower part of the reaction tube) are arranged so as to form a pair. The combustion gas combusted by the burner in a limited space on the flame guide side passes through the center of the triple pipe and flows to the upper exhaust gas duct (A). At this time, the filling material in the center of the triple pipe is heated,
The filling material) transfers heat to the inner tube (c) of the reaction tube (to).

In this operating state, a pair of burners and a reaction tube are connected to one combustion space formed by the flame guide diagram, so all the combustion gas in one burner is 1 1 reaction tube (to).

Therefore, if burners with the same characteristics are used, the amount of combustion gas obtained by each burner (in each reaction tube) depends only on the pressure drop difference between the filling material in the combustion gas passage (in each reaction tube);
If the pressure loss in step 7) is adjusted to be constant, the above-mentioned amount of combustion gas will be the same flow rate, making it possible to uniformly heat the reaction tube (2).

Furthermore, since the space outside the flame guide has a heat insulating effect, heat loss can be suppressed and the efficiency of the device can be increased.

In the above embodiment, a case has been described in which the reaction tube is arranged at the upper part and the burner is arranged at the lower part, but even if the reaction tube is arranged at the lower part and the burner is arranged at the upper part, the same effect as in the above embodiment can be obtained.

Furthermore, if the space outside the flame guide is filled with a heat insulating material, the heat insulation effect will be further enhanced and heat loss will be reduced.

〔Effect of the invention〕

As described above, according to the present invention, since the combustion space is limited and divided according to the plurality of reaction tubes using the flame guide, heat loss due to heat radiation from the furnace surface is reduced, and the combustion gas is rectified. , uniform heating of each reaction tube is also possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of a reformer according to an embodiment of the present invention, FIG. 2 is an enlarged view of the tip of the reaction tube in FIG.
5), @ is a cross-sectional side view and a cross-sectional plan view of a conventional reformer,
FIG. 4 is an enlarged view of the tip of the reaction tube in FIG. 3. In the figure, a) is a reaction tube, a) is a burner, a) is a combustion space, and a) is a flame guide. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A reformer for reforming hydrocarbon fuel into hydrogen-rich gas by a steam reforming method includes: an annular reaction tube that also serves as a combustion gas flow path; a combustion burner disposed in a pair with the reaction tube; A reformer comprising: a combustion space provided between a reaction tube and the combustion burner; and a flame guide provided to partition the combustion space in correspondence with the reaction tube.