JPS6051602A - Alcohol reforming apparatus - Google Patents

Abstract

PURPOSE:To make uniform the temp. in a reforming section in an apparatus for converting alcohol to H2-rich gas utilizing the heat of engine exhaust gas, to reduce fuel consumption and to stabilize the engine by supporting reforming catalyst on a perforated grid-shaped heat conducting member. CONSTITUTION:Alcohol vapor introduced from an inlet 12 and evaporated in an evaporating section 9 is fed to an inlet chamber 14a of a reforming apparatus through a passage represented by a chain line. The gas is then introduced into the reforming section 5 (7 is a catalyst supporting member, and 7a is a small hole, 6 is the catalyst) where it is reacted, and produced H2-rich gas is taken out through an outlet chamber 15a and an outlet 15 of the reformed gas. Since the above described reaction is an endothermic reaction, necessary heat is supplied utilizing the heat of engine exhaust gas introduced from an inlet 18 and exhausted from an outlet 19. In the above-described apparatus, the reforming section 5 is constructed by using grid-shaped heat conducting member 28 comprising perforated plates 29 having samller holes 30 and constructing the wall surface vertical to the direction of the flow of feed gas and supporting the catalyst 6 on the heat conducting member 28.

Description

Detailed Description of the Invention [Industrial Application Field] This yl light is used to convert alcohol, for example, methanol into -1
-Njin's 2;! When used as 51'il, it involves a reformer to reform it into a hydrogen-rich gas that is easily combustible.

[Prior Art] In general, alcohol reformers reform alcohol into hydrogen-rich gas, which is then fed into an engine as a fuel that is easily combustible.
Development is currently progressing in various fields to increase the C1 thermal efficiency of the supply gas and to enable combustion with (more diluted) 12 aiki.

This reformer combines a reforming section that has a catalyst layer separated by a number of parallel fin channels and an evaporation section that evaporates alcohol into one tenth member. It is also laminated on the membrane, and FIJ is added to guide the engine exhaust to this -14-like Niremen 1 ~, and the structure is configured to utilize the heat.

Now, this conventional alcohol reformer is specifically shown in Figure 1~
This will be explained with reference to FIG.

The reformer is composed of a reformer elm plate;・1 and an exhaust tube (・2.A partially cross-sectional side view is shown in Fig. 2, and a floor plan of the plate material, crushed material, and noin for the reforming section is shown. As shown in Figure 3, a flat plate type reaction layer (-8 pieces of cymen l
-> 22 is constructed, and the void containing the twin 111], that is, the reforming section 5, is filled with a reforming catalyst 6 (pellets of approximately 1 m/m diameter), thereby causing parallel contact 9! /,
A large number of layers 5a are formed. Reference numeral 7 denotes a catalyst support member having a large number of small holes 7a through which fluid vapor passes.

There is an exhaust passage e, 8, which is composed of a gap between the flat plates 3, and the upper and lower sides of the duct are connected to the exhaust ducts 1 and 2.9 is the evaporation part of the ILB body, and 10 is the housing board,
1゛1 is 1iτ heat fin, 1゛18 is for evaporation section, l
l b For IJ reforming section, 12 is liquid aluminum 1-
1", 13 is for the alcohol evaporation section [K, 11I is for the modified 7'1 part I", 15 is the reformed gas output 1], 16 is the catalyst filling port provided at the top and bottom, 17 is for the 1st grade 118 is the exhaust man 1'', and 19 is the exhaust outlet C.

Liquid 1 Wood 7 Flucol enters through the liquid alcohol 12 and evaporates in the evaporation section 9 while bending the partition plate 10.
For the evaporator section [113 enters the reformer inlet 14 (k″:,
The piping from the light section 1 to the reformer inlet is small at one point vA line), spreads to the inlet chamber 14a, and is connected to the small hole 7 of the catalyst support member 7.
a, flows from each catalyst layer portion to the gas passage 5a, and exits the outlet chamber 1.
5a, and the reformed gas is taken out from the engine l\ from the reformed gas outlet 15. At that time, the alcohol gas is converted into a gas rich in hydrogen by the catalyst 6 of the reforming section 5.

This reaction is an endothermic reaction, and the exhaust gas enters from the exhaust inlet 18 due to the heat supplied from the engine exhaust, passes through the exhaust passage 8 between the plates 443, and passes through the fins in contact with the plate 3. Heat is supplied to the contact 16 through the upper surface 20 and lower surface 21 of 11b. Incidentally, in the evaporating section 9, the remaining heat is used for evaporating the liquid alcohol by the fins 11#I.

The catalyst 6 generally has poor heat conductivity, but since it is provided with heat transfer fins 11, heat is easily transferred, and the temperature difference in the direction of alcohol flow is small, so reforming of 7-fluor alcohol can be carried out under normal conditions. Well done.

However, in such a conventional alcohol reformer, the temperature difference between the left and right sides in Figure 111 becomes small, and the left side [ , L) Easy tb- is low, alcohol flow rate is high, and temperature is on the right side? +'i< Since the alcohol flow m is likely to decrease, so-called detunneling phenomenon ρ, which tends to occur, there is a problem that the engine drivability is likely to be deteriorated.

In other words, in Figure 1, the temperature is higher on the right side 1)1
It is close to ``Ki in 1'' and `` out ['', and it is true, anti-λ
・The left side of J is the inlet and outlet of alcohol with low temperature.
Since Fr < /J, there is a slight (b)h1 degree difference between the left and right catalyst layers. Under normal operating conditions, this temperature difference poses no problem for steaming, but when idling, etc., the alumina flow rate decreases, the reforming reaction progresses on the right side due to the high temperature, and is delayed on the left side. Taking methanol as an example, in the reforming reaction, 1 mole of methanol is 1 mole of water, 1 mole of water, and 1 mole of carbon monoxide.
Since the reaction changes to 3 moles of moles, the flow rate is small in terms of the metal body, and on the right side, the flow resistance increases due to the increase in 11, and the flow rate decreases, so the heat absorption decreases. The temperature becomes high, and on the other hand, the reaction on the ji side is delayed, so
As the flow resistance decreases and the flow rate increases, heat absorption increases and the temperature becomes even lower.Thus, the temperature difference on the right side becomes much more pronounced than in the beginning, suppressing the so-called tunneling phenomenon. be.

For this reason, methanol is concentrated in the low-humidity area where the reforming reaction does not occur sufficiently, and the hydrogen (+12) iT1 degree in the reformed gas is low, making the engine unstable in the combustion state with a lean mixture, resulting in lower fuel consumption and exhaust gas. This results in the problem of deterioration of drivability.

The above problem arises from the fact that the reformer uses engine exhaust heat and uses the reformed gas as fuel, so the connection to the exhaust pipe, the piping to the alcohol fuel supply system, and This was an inevitable result of the restrictions on the policy.

[Object of the Invention] This invention aims to equalize the temperature difference of the reformer by acknowledging the temperature difference caused by the above-mentioned inevitable constraints of the reformer. LI hit the mark.

[Structure of the Invention] In order to achieve the above-mentioned object, the present invention comprises laminating flat plate-type catalytic reaction layers constituted by a plate 4J and a frame material, filling the flat-plate catalytic reaction layer with a catalyst, and applying alcohol. The alcohol reformer designated as -C constitutes a reforming section that converts hydrogen into a hydrogen-rich gas.

[Effect 1] According to the above-mentioned configuration 414, the grid-like heat transfer member can absorb the heat of the exhaust gas in the direction of alcohol flow and in the direction perpendicular to this, so that the temperature on the side remote from the air inlet is also low. ? By doing so, it is possible to avoid the channeling phenomenon and maintain a uniform temperature in the reforming section.

[Example] FIG. 4 is a diagram showing an embodiment of the present invention.

First, to explain the configuration, the reforming section 5 is provided with a lattice-shaped heat transfer member 28. 4A I' of this heat transfer member 28
l is a thin plate of heat-resistant metal such as stainless steel (with a thickness of 0
．． 1m/mFi! Copper plating with a thickness of about 20μ has good heat conductivity, and it is effective because it can be filled with a large amount of catalyst.

FIGS. 5 and 6 show sketches of examples of the lattice-shaped heat transfer member 28. Fig. 5 shows a stack of bent plates 29 of the same shape with the same IIZ loss, and Fig. 6 shows a stack of bent plates 29 with the same IIZ loss. However, they are all the same in that they are formed in a grid pattern.These plates 29 have one hole 3o at each bend.
There are 1]

The above plate 29 is connected to the river /, : grid-like 1 heat member 28
Assemble the reformer Niremen 1 to 1 (next, avoid contacting the upper and lower surfaces with the flat plate, and simultaneously solder (=J[]
1 [ru.

Note that the other exhaust duct I-2 and silent part 9tI7 ('' are the same as the conventional one.

Next, the operation of the above embodiment will be explained.

When the alcohol enters through the alcohol inlet '12, while bending through the partition wall 10, it receives residual exhaust heat from the exhaust passage through heat transfer through the fins 11a, evaporates in the evaporator 9, and evaporates at the evaporator outlet 13. The passage shown by the dashed line leads to the reforming section 14, which expands to an inlet chamber '14a.

Here, the alcohol flows through the small holes 7a of the catalyst support member 7 into the 8 holes tsH of the reforming section 5.

The lattice-shaped heat transfer member 28 is formed in a vertical and horizontal lattice shape (each lattice is filled with a catalyst), so it transfers heat in the alcohol flow direction and its fj angle direction, and the exhaust population 18
and outlet 19, the remote side contact IJ1. Transfers heat evenly to the layers.

Therefore, the temperature of the reforming section 5 becomes uniform, and the reforming reaction on the catalyst is carried out evenly, making it difficult for the channeling phenomenon to occur.

Since the heating section 28 has holes 30 in the vertical and horizontal directions, it is difficult to prevent the flow of alcohol. In other words, there is J3 on the high temperature side of the exhaust inlet.
, when the flow resistance increases due to the increase in the number of moles due to the reforming reaction, the reformed gas changes its flow in the lateral direction and flows smoothly in the iPJ, so it is possible to prevent the flow σ from decreasing on the high temperature side. It never happens.

Also, the hole 30 does not cause any inconvenience because -C also prevents the catalyst from moving when the catalyst is filled.

In conventional reformers, the catalyst layer was formed by channel-shaped fins in the direction of alcohol flow, so the heat transfer in the vertical direction was good, but the heat transfer in the horizontal direction was inferior, and it was inevitable that Boo 1/There was C of b which caused the tunneling phenomenon.

However, in this embodiment, the grid-like IL and the J
The viscosity of the catalyst layer is divided into a lattice pattern, and the heat transfer properties in the vertical and horizontal directions are improved, resulting in improved channeling. can be avoided.

As explained above, the present invention has a structure in which a lattice-like heat transfer part (A) is provided in the reforming part, so that the temperature part (b) of the reforming part becomes uniform, and the engine Even when the alcohol flow is low, such as when idling, a channeling phenomenon does not occur, and a reformed gas with a high temperature of 211 degrees can be obtained, improving engine combustion, exhaust gas cleaning, and drivability. The effect is that it can be improved.

Effects of the invention] (1) The channeling phenomenon can be avoided and the hydrogen concentration of the reformed residue can be increased.

(2) The lotus roll of J-jin due to the lean mixture becomes iiJ-no.

(3) The reforming section can be improved by simply changing the fins, reducing man-hours and costs.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional reformer, q! 2 is a side view of FIG. Figure 5 is a grid-like heat transfer N; a sketch of an example of a shrine;
FIG. 6 is a sketch of another example. Explanation of symbols shown in the drawings 1...Reformer 2 [Element 2...171 Tact 3...Plate material 4...Frame material 5...Reforming section 6...Catalyst 7... -Catalyst support part 8...Exhaust passage 9...Evaporation part 10...Partition plate 11, 1 Ia, 1-1b -Heat transfer fin 12...
Liquid alcohol inlet 13...Alcohol evaporated product output [1 14...Reforming section population 15...Reformed scum output [211
6...Catalyst filling port 17...IMA 1. U Renri 18... Fresh air inlet 19... JJI air outlet 22.
... Flat plate type catalytic reaction layer 28 ... Grid-shaped heat transfer member 29 ... Plate 30 ... Hole Fig. 2 11a42 Crane Fig. 3

Claims (1)

[Claims] A flat catalyst reaction layer of 11M is formed on the pulverized material of the plate 4A for 1 hour, the flat catalyst reaction layer is filled with a catalyst, and the full nitrogen is filled with a hydrogen-rich gas. (14)
The alcohol reformer made of J5 is equipped with the above reformed 1° (
A J' lunile reformer characterized by having a lattice-shaped heat transfer member installed in the part.