JP2008144730A - Fuel supply system for power source and fuel supply method to power source - Google Patents

Abstract

A fuel supply system for a power source and a fuel supply method for the power source capable of improving startability and fuel consumption.
A power source fuel supply system includes a power source that operates with generation of heat, and a conversion source that supplies a conversion fuel containing at least one of diethyl ether and ethylene to the power source in accordance with operating conditions of the power source. A fuel supply system for a power source comprising a fuel supply means, wherein the conversion fuel supply means includes a heat exchange means having an ethanol conversion function, and the heat exchange means having an ethanol conversion function is a power source or an exhaust thereof. An ethanol conversion catalyst for recovering heat generated by the system and converting an ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene is provided.
[Selection] Figure 1

Description

  The present invention relates to a fuel supply system for a power source and a fuel supply method to the power source, and more particularly to a fuel supply system for a power source and a fuel supply method to the power source that can improve startability and fuel consumption.

In consideration of the global environment, reduction of carbon dioxide (CO ₂ ) emissions has been demanded, and various attempts have been made in internal combustion engines for the purpose of improving the fuel consumption.
Specifically, a lean burn engine, a direct injection engine in a gasoline engine, a high-pressure injection technique in a diesel engine, and addition of an octane number improver in a fuel can be mentioned.

On the other hand, as an approach from fuel, in addition to gasoline and light oil that are conventionally used, hydrogen, alcohols such as methanol and ethanol, ethers such as dimethyl ether and methyl tertiary butyl ether, biodiesel, gas-to-liquid ( Alternative fuels such as synthetic fuels such as GTL) are also being studied.
Among them, ethanol is attracting attention in recent years as a carbon neutral fuel that can be regenerated because it can be produced from bio origin and does not increase CO ₂ in the atmosphere.
In addition, since alcohols contain oxygen atoms in their molecules, mixing with gasoline is expected to improve the octane number and contribute to improving fuel combustibility.
For this reason, in some countries, a gas hole, which is a fuel in which a certain amount of ethanol is mixed with gasoline, is already used as a fuel for an internal combustion engine.

However, compared to gasoline, the amount of heat is inferior to that of gasoline, so the output decreases by the amount of mixing, which may adversely affect fuel consumption. not be said to lead to, CO ₂ reduction also eliminated significantly.

  From such a background, for the purpose of optimizing various conditions when supplying a mixed fuel of gasoline, light oil or the like and alcohol to the internal combustion engine, a supply method or an injection method of the mixed fuel to the internal combustion engine, etc. Various techniques have been proposed.

  Specifically, the alcohol-mixed gasoline fuel is heated to a temperature equal to or higher than the reforming temperature of the alcohol to obtain reformed gas, the gasoline is gasified, the gasified gasoline fuel is cooled and condensed, There has been proposed an engine fuel supply device that separates and supplies them to the engine in a separate system (see Patent Document 1).

Also, a compact double fuel injection valve for effectively supplying and injecting alcohol-mixed light oil fuel has been proposed (see Patent Document 2).
Japanese Examined Patent Publication No. 60-47469 JP-A-6-10787

  However, the engine fuel supply device described in Patent Document 1 is effective when the alcohol is methanol, which is relatively easy to reform, but reforming when the ethanol requires a higher reforming temperature. Conversion to gas is difficult. Further, the relationship between the engine operating conditions and the supply of reformed gas is not taken into consideration, and it has been unclear whether the obtained reformed gas can contribute to improving the efficiency of the internal combustion engine.

  Moreover, if the fuel component advantageous to diesel engine combustion is obtained from the mixed alcohol fuel, the double fuel injection valve of patent document 2 is considered that the improvement effect of combustion efficiency will be acquired also by the conventional injection device. . However, the main focus is on the fuel injection valve, and the characteristics of the fuel, that is, the alcohol species to be mixed are not considered.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a fuel supply system for a power source and a fuel supply method to the power source that can improve startability and fuel consumption. Is to provide.

  The present inventor has conducted extensive studies to achieve the above object, and as a result, a power source that operates with the generation of heat and a converted fuel containing at least one of diethyl ether and ethylene according to the operating conditions of the power source. Thus, the present inventors have found that the above object can be achieved by providing predetermined conversion fuel supply means for supplying the power source to the power source, and have completed the present invention.

  That is, the power supply fuel supply system according to the present invention supplies a power source that operates with generation of heat and a converted fuel containing at least one of diethyl ether and ethylene to the power source according to the operating conditions of the power source. A fuel supply system for a power source comprising a conversion fuel supply means for supplying, wherein the conversion fuel supply means includes a heat exchange means having an ethanol conversion function, and the heat exchange means having the ethanol conversion function, It comprises an ethanol conversion catalyst that recovers heat generated by the power source or its exhaust system and converts an ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene. .

  Further, the fuel supply method to the power source of the present invention activates the ethanol conversion catalyst by the heat generated by the power source or its exhaust system, and contacts the ethanol-containing fuel containing ethanol with the ethanol conversion catalyst. A method for supplying fuel to a power source, wherein the fuel is converted into a converted fuel containing at least one of diethyl ether and ethylene, and the resulting converted fuel containing at least one of diethyl ether and ethylene is supplied to the power source, The conversion fuel is supplied at the time of at least one operating condition selected from the group consisting of starting the source, low load operation and medium load operation.

  According to the present invention, a predetermined conversion fuel supply that supplies a power source that operates with the generation of heat and a conversion fuel containing at least one of diethyl ether and ethylene to the power source according to operating conditions of the power source. Therefore, it is possible to provide a power source fuel supply system and a fuel supply method to the power source that can improve startability and fuel consumption.

The power source fuel supply system of the present invention will be described below.
In the present specification, “%” for concentration, content, etc. represents mass percentage unless otherwise specified.
“Ethanol-containing fuel” means a fuel containing 100% ethanol, gasoline-ethanol mixed fuel, etc. containing ethanol in any proportion, but fuel with a high ethanol content can improve fuel efficiency relatively. Becomes larger.

As described above, the fuel supply system for a power source according to the present invention supplies a power source that operates with generation of heat and a converted fuel containing at least one of diethyl ether and ethylene to the power source according to the operating conditions of the power source. A power source fuel supply system comprising: a conversion fuel supply means for supplying, wherein the conversion fuel supply means includes a heat exchange means having an ethanol conversion function, and the heat exchange means having an ethanol conversion function is a power source. In addition to recovering heat generated by the exhaust system, an ethanol conversion catalyst for converting an ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene is provided.
When ethanol is supplied directly to the power source, the latent heat of vaporization of ethanol is about twice that of gasoline, so there is a problem with warm-up at start-up. Since diethyl ether has a boiling point as low as 34.6 ° C. and the latent heat of vaporization is similar to gasoline, the problem of warm-up at start-up by supplying converted diethyl ether or ethylene to the power source is This is a power source fuel supply system that can be avoided and improve startability and fuel consumption.

  Here, examples of the power source that operates with the generation of heat include an internal combustion engine and a solid electrolyte fuel cell.

The conversion fuel supply means supplies a conversion fuel containing at least one of diethyl ether and ethylene to the power source according to the operating conditions of the power source, and heat generated by the power source or its exhaust system. It is necessary to provide a heat exchange means having an ethanol conversion function provided with an ethanol conversion catalyst for converting an ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene.
As described above, the heat generated by the power source or its exhaust system is recovered, and the ethanol-containing fuel containing ethanol is converted into a converted fuel containing at least one of diethyl ether and ethylene. By supplying ethylene to the power source, the problem of warm-up property can be avoided at the time of starting, and a power source fuel supply system that can improve the startability and fuel consumption is obtained.

Examples of the ethanol conversion catalyst include a catalyst that generates at least one of diethyl ether ((C ₂ H ₅ ) ₂ O) and ethylene (C ₂ H ₄ ) by a dehydration reaction of ethanol from a relatively low temperature condition. it can.
These are represented by reaction formulas (I) and (II), reaction formula (I) is an intramolecular dehydration reaction, reaction formula (II) is an intermolecular dehydration reaction, and these are endothermic reactions, respectively. is there.

C ₂ H ₅ OH → C ₂ H ₄ + H ₂ O (I)
2C ₂ H ₅ OH → C ₂ H ₅ OC ₂ H ₅ + H ₂ O (II)

  The heat generated by the power source or the exhaust system thereof can be recovered by causing the reaction using the heat generated by the power source or the exhaust system of the internal combustion engine or the like.

  When the heat recovery efficiency in the dehydration reaction using ethanol as a starting material is calculated on the basis of the lower calorific value as shown in the following calculation formula (1), the heat recovery efficiency η in the reaction formula (I) is 108%. The heat recovery efficiency η of (II) is 103%. Therefore, when the heat recovery efficiency is compared, the intramolecular dehydration reaction is advantageous from the viewpoint of heat recovery, that is, fuel efficiency.

  Heat recovery efficiency η (%) = [LHV (reformed gas) −LHV (ethanol)] / LHV (ethanol) × 100 (1)

As the ethanol conversion catalyst, for example, a low-temperature ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of 18 or more and 60 or less can be suitably used.
More specifically, as the aluminosilicate, an MFI type zeolite having a silica / alumina ratio of 20 to 45, a β type zeolite having a silica / alumina ratio of 20 to 60, and a silica / alumina ratio of 18 to 35. The following mordenite-type zeolite, Y-type zeolite having a silica / alumina ratio of 18 or more and 35 or less, and a mixture according to any combination thereof can be suitably used.
In each zeolite, the performance of dehydration condensation of ethanol is deteriorated even when the upper limit or lower limit of the silica / alumina ratio described above is exceeded. In particular, in the case of MFI-type zeolite, if it is less than 20, the ethanol conversion decreases, and if it exceeds 45, the reaction temperature for obtaining a high conversion increases.
For other zeolites, the silica / alumina ratio is preferably within the above range for the same reason.
Such a low-temperature type ethanol conversion catalyst efficiently converts an ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene by heating using exhaust heat from a power source such as an internal combustion engine. It becomes possible to make the reaction to convert.
In addition, even in the case where the exhaust heat from a power source such as an internal combustion engine is at a relatively low temperature (for example, a temperature range of 150 ° C. or higher and 450 ° C. or lower), an ethanol-containing fuel containing ethanol is efficiently converted to at least one of diethyl ether and ethylene. Since it can be converted into the contained conversion fuel, it can be applied to a high-efficiency internal combustion engine, and a fuel efficiency improvement effect can be obtained.
Therefore, it is desirable that the low-temperature ethanol conversion catalyst is operated at a temperature of 150 to 450 ° C. from the viewpoint that the dehydration reaction of ethanol can be effectively caused.

Moreover, as said ethanol conversion catalyst, the high temperature type ethanol conversion catalyst containing the aluminosilicate whose silica / alumina ratio is more than 60 can also be used suitably, for example.
More specifically, examples of the aluminosilicate include an MFI type zeolite having a silica / alumina ratio exceeding 60, a β type zeolite having a silica / alumina ratio exceeding 60, and a mordenite type having a silica / alumina ratio exceeding 60. Zeolite, or Y-type zeolite having a silica / alumina ratio of more than 60, and a mixture of any combination thereof can be suitably used.
Such a high-temperature ethanol conversion catalyst is an ethanol-containing fuel that efficiently contains ethanol in a relatively high temperature range (for example, a temperature range of more than 450 ° C. and 650 ° C. or less) of exhaust heat from a power source such as an internal combustion engine. It can be converted into a converted fuel containing at least one of diethyl ether and ethylene.

Furthermore, as the ethanol conversion catalyst, for example, a catalyst containing palladium (Pd) can be suitably used.
More specifically, for example, an ethanol conversion catalyst in which about 0.1 to 4% of palladium is supported on an alumina base (Al ₂ O ₃ ) can be suitably used.
Such an ethanol conversion catalyst can also efficiently convert an ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene by heat generated from a power source such as an internal combustion engine or its exhaust system.

Furthermore, as the ethanol conversion catalyst, for example, a catalyst contained in a catalyst layer formed on a metal monolith support having three-dimensional continuous pores can be suitably used.
Such an ethanol conversion catalyst is obtained by applying to a monolithic carrier having three-dimensional continuous pores made of metal, and the contact efficiency between the catalyst surface and ethanol is increased, heat transfer is promoted, etc. Therefore, it is possible to convert ethanol more efficiently, that is, even with a small catalyst.
In addition, the ethanol conversion catalyst mentioned above can be used individually or in combination.

The exhaust system of the power source described above may be provided with a conventionally known exhaust gas purification catalyst, and is not particularly limited as such an exhaust gas purification catalyst, but for example, a so-called particulate filter having a filter structure. Type exhaust gas purification catalyst.
Such a particulate filter type exhaust gas purifying catalyst generates heat when the particulate matter is burned off and regenerated. And it becomes possible to complete the dehydration reaction as described above by activating the high-temperature ethanol conversion catalyst by the heat generated by the regeneration. As described above, since this reaction is an endothermic reaction, an effect of preventing overheating of the filter can be expected.
Therefore, it is desirable to use the above-described high-temperature ethanol conversion catalyst in combination with a particulate filter type exhaust gas purification catalyst. That is, if the ethanol conversion catalyst can be used under higher temperature conditions, the catalytic reaction efficiency can be increased, and the energy conversion efficiency can also be improved.
Moreover, there is an advantage that the fuel supply system of the power source can be made compact by arranging the ethanol fuel conversion catalyst at a position where the heat generated from the exhaust gas purification catalyst can be utilized.
As described above, the exhaust system of the power source includes, for example, an exhaust gas purifying catalyst provided in the exhaust system when the power source is an internal combustion engine.

Moreover, in the fuel supply system of the power source of this invention, what is provided with the conversion fuel storage means can be used suitably as a conversion fuel supply means, for example.
By providing conversion fuel storage means such as a tank for storing diethyl ether or ethylene between, for example, an ethanol conversion catalyst and a power source, converted fuel containing diethyl ether or ethylene can be used as a power source for an internal combustion engine or the like when necessary. The fuel can be supplied, and an appropriate fuel can be supplied according to the operating conditions.

Furthermore, in the power source fuel supply system of the present invention, as the conversion fuel supply means, for example, one provided with a heat exchange means having a by-product water separation function can be suitably used.
By providing a heat exchange means having a function of separating water produced as a by-product when ethanol is converted into diethyl ether or ethylene, for example, between an ethanol conversion catalyst and a power source, water is unnecessarily removed from an internal combustion engine, etc. Therefore, it is possible to avoid supply to the power source, and the flammability can be further improved.

In the power source fuel supply system of the present invention, as the conversion fuel supply means, for example, one provided with a heat exchange means having an ethanol-containing fuel vaporization function can be suitably used.
By providing a heat exchange means having an ethanol-containing fuel vaporization function, for example, on the upstream side of the ethanol conversion catalyst, it is possible to promote the vaporization of ethanol in the ethanol-containing fuel and promote the dehydration reaction at the ethanol conversion catalyst.

Further, in the power source fuel supply system of the present invention, the heat exchange means having the by-product water separation function and the heat exchange means having the ethanol-containing fuel vaporization function constitute one heat exchange system. Can be suitably used.
By adopting such a configuration, the catalytic reaction efficiency can be increased, the energy conversion efficiency can be improved, the combustibility in the power source can be improved, and the fuel supply of the power source can be improved. There is also an advantage that the system can be made compact.

Moreover, in the power source fuel supply system of the present invention, as the conversion fuel supply means, for example, one provided with gas conversion fuel injection means can be suitably used.
By providing the gas conversion fuel supply means between, for example, the ethanol conversion catalyst and the power source, the gas-state converted fuel can be supplied to a power source such as an internal combustion engine.

Furthermore, in the power source fuel supply system of the present invention, as the conversion fuel supply means, for example, one provided with conversion fuel pressurization means can be suitably used.
By providing the conversion fuel pressurizing means between, for example, the ethanol conversion catalyst and the power source, for example, diethyl ether has a relatively low boiling point of 34.6 ° C., and easily enters a liquid state by pressurization. It can be stored in a liquid state and supplied to a power source such as an internal combustion engine.

Furthermore, in the power source fuel supply system of the present invention, as the conversion fuel supply means, for example, one having a liquid conversion fuel supply means can be suitably used.
By providing the liquid conversion fuel supply means between, for example, the ethanol conversion catalyst and the power source, the liquid conversion fuel can be supplied to a power source such as an internal combustion engine.

On the other hand, in the power source fuel supply system of the present invention, a system further provided with ethanol-containing fuel supply means can be preferably used.
Since ethanol is a high-octane fuel, it is also effective to operate by supplying ethanol-containing fuel directly to a power source such as an internal combustion engine.
In particular, it is preferable to directly supply and burn during high load operation.

Next, the fuel supply method to the power source of the present invention will be described.
As described above, in the fuel supply method to the power source of the present invention, the ethanol conversion catalyst is activated by the heat generated by the power source or the exhaust system thereof, and the ethanol-containing fuel containing ethanol is brought into contact with the ethanol conversion catalyst. A method of supplying fuel to a power source, wherein the fuel is converted into a converted fuel containing at least one of diethyl ether and ethylene, and the resulting converted fuel containing at least one of diethyl ether and ethylene is supplied to the power source, This is a method of supplying the converted fuel at the time of starting the power source, at the time of low load or medium load, and at the time of operation according to any combination thereof.
By such a method, startability and fuel consumption can be improved.

As described above, ethanol has a high octane number and is advantageous for combustion under a high load, but its startability and low / medium load combustion characteristics are inferior to those of conventional gasoline fuel. Thus, under operating conditions excluding high load conditions, the combustibility can be improved by supplying the generated converted fuel containing diethyl ether or ethylene to a power source such as an internal combustion engine.
In addition, for example, since driving is possible even under leaner conditions, it is advantageous for further improving fuel efficiency.

In the method for supplying fuel to the power source of the present invention, the ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of 18 or more and 60 or less is used as the ethanol conversion catalyst. In activating the catalyst, the temperature of the ethanol conversion catalyst is preferably set to 150 ° C. or higher and 450 ° C. or lower.
The ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of 18 or more and 60 or less is a low-temperature type ethanol conversion catalyst, and as described above, ethanol efficiently in a low temperature range of 150 ° C. or more and 450 ° C. or less. Can be converted to a converted fuel containing at least one of diethyl ether and ethylene.

On the other hand, in the fuel supply method to the power source of the present invention, an ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of more than 60 is used as the ethanol conversion catalyst, and the ethanol conversion catalyst is activated. In order to achieve this, it is preferable that the temperature of the ethanol conversion catalyst is higher than 450 ° C. and lower than 650 ° C.
The ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of more than 60 is a high-temperature type ethanol conversion catalyst, and efficiently contains ethanol in a high temperature range of more than 450 ° C. and not more than 650 ° C. as described above. The ethanol-containing fuel can be converted to a converted fuel containing at least one of diethyl ether and ethylene.
In addition, when it exceeds 650 degreeC, decomposition | disassembly reaction of diethyl ether or ethylene occurs and is not preferable.

Furthermore, in the fuel supply method to the power source of the present invention, it is preferable that the ethanol-containing fuel containing ethanol is vaporized in advance when the ethanol-containing fuel containing ethanol is brought into contact with the ethanol conversion catalyst.
By vaporizing ethanol in the ethanol-containing fuel by such a method, the dehydration reaction with the ethanol conversion catalyst can be promoted.

Furthermore, in the fuel supply method to the power source of the present invention, when the converted fuel containing at least one of diethyl ether and ethylene is supplied to the power source, the converted fuel containing at least one of diethyl ether and ethylene is included. It is preferable to separate the water to be separated in advance.
By such a method, it is possible to avoid unnecessarily supplying water to a power source such as an internal combustion engine, and to further improve the combustibility.

Next, the power supply fuel supply system and the fuel supply method to the power source according to the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of a fuel supply system for an internal combustion engine, which is an embodiment of a fuel supply system for a power source according to the present invention.
As shown in the figure, this internal combustion engine fuel supply system includes a power source 10 that operates with the generation of heat, such as a gas hole engine, an ethanol-containing fuel storage means 30 such as an ethanol-containing fuel tank, and diethyl ether. And a conversion fuel supply means 20 for supplying a conversion fuel containing at least one of ethylene to the power source in accordance with the operating conditions of the power source, and an ethanol-containing fuel supply means 40.
The conversion fuel supply means 20 includes a heat exchange system 24 including a heat exchange means 22 having an ethanol conversion function, a heat exchange means having a by-product water separation function, and a heat exchange means having an ethanol-containing fuel vaporization function. And a conversion fuel storage means 26 such as a conversion fuel tank, and a gas conversion fuel injection means 28 such as a gas injector.
Further, the heat exchanging means 22 having an ethanol conversion function recovers heat generated by an exhaust gas purification catalyst (not shown) provided in the exhaust system 12 of the power source, and converts ethanol-containing fuel containing ethanol into diethyl ether and ethylene. An ethanol conversion catalyst (not shown) for converting into a converted fuel containing at least one of the above is provided.
Furthermore, the ethanol-containing fuel supply means 40 includes a liquid ethanol-containing fuel injection means 42.

  For example, when the power source 10 that operates with heat generation is started, the converted fuel stored in the converted fuel storage unit 26 is supplied from the gas converted fuel injection unit 28 to the power source 10 that operates with heat generation. . Then, the power source 10 is started.

Further, ethanol-containing fuel is stored in the ethanol-containing fuel tank 30, and this ethanol-containing fuel is a secondary gas during operation of the power source 10 that operates with generation of heat, particularly during low-load operation and medium-load operation. The heat exchanging means 22 is supplied to the heat exchanging system 24 composed of a heat exchanging means having a function of separating generated water and a heat exchanging means having an ethanol-containing fuel vaporizing function. The vaporized ethanol-containing fuel is converted into converted fuel by the ethanol conversion catalyst (not shown) disposed in the heat exchange means 22 having an ethanol conversion function, and the exhaust gas purification catalyst (not shown) generates heat. Is recovered and supplied to the heat exchange system 24 again. Water is separated, is fed to the conversion fuel storage means 26, the conversion fuel is supplied from the gas for converting the fuel injection means 28 to the power source 10 to operate with the generation of heat. Then, the power source 10 is operated.
The heat required when the ethanol-containing fuel is vaporized by the heat exchange system 24 is covered by the heat generated when the by-produced water is separated by the heat exchange system 24. However, the power source 10 and its exhaust system 12 are provided. You may utilize the heat which generate | occur | produces from.
The heat exchange system 24 includes a water tank 24a for storing separated water.

  Further, during operation of the internal combustion engine, particularly during high load operation, the ethanol-containing fuel stored in the ethanol-containing fuel tank 30 is directly supplied from the liquid ethanol-containing fuel injection means 42 to the power source 10 that operates with heat generation. Supplied.

Thus, by supplying the conversion fuel containing at least one of diethyl ether and ethylene to the power source according to the operating conditions of the power source, the startability and fuel consumption can be improved.
The operating conditions of the power source are the temperature sensor, torque sensor, oxygen sensor, and solid electrolyte fuel cell that are installed in an internal combustion engine. It is determined by various sensors such as a meter and an electronic control device that can calculate data input from the various sensors. Based on this determination, the electronic control unit controls the conversion fuel supply means and the ethanol-containing fuel supply means.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

(Example 1)
<Production of ethanol conversion catalyst>
A catalyst having a composition as shown in Table 1 is applied to a nickel alloy metal foam monolith carrier having pores of 30 ppi at 170 g / L. In applying the catalyst powder to the monolith carrier, the catalyst powder, water and silica sol binder are mixed, and the slurry is made into a slurry by applying a pot mill grinder to the monolith carrier. Through this, an ethanol conversion catalyst was obtained.
The amount of silica sol binder added was 6%.

<Production of power supply fuel supply system>
The power conversion fuel supply system of this example was constructed by incorporating the obtained ethanol conversion catalyst into a predetermined position of the power supply fuel supply system as shown in FIG.

(Examples 2 to 6)
Except that the catalyst having the composition shown in Table 1 was used, the same operation as in Example 1 was repeated, and a power supply fuel supply system for each example was constructed.

(Comparative Example 1)
Except that the catalyst having the composition shown in Table 1 was used, the same operation as in Example 1 was repeated, and a power supply fuel supply system for each example was constructed.
In addition, 1% platinum (Pt) / alumina supported 1% of Pt on γ-alumina having a specific surface area of 180 m ² / g, and a catalyst was obtained through drying and firing processes.

[Catalyst performance evaluation]
For the evaluation of the catalyst incorporated in each of the above examples, ethanol was supplied to the monolith catalyst together with a nitrogen carrier using a normal pressure flow reactor.
The amount of ethanol supplied was LHSV = 30 h ⁻¹ based on the volume of the monolith catalyst, and the reaction was carried out at a catalyst inlet temperature of 100 ° C. to 500 ° C.
The obtained results are shown in Table 1.

  From Table 1, it can be seen that in the catalyst used in the power source fuel supply system of the present invention, diethyl ether and ethylene can be produced effectively even under relatively low temperature conditions. Since these dehydration reactions are endothermic reactions, it can be seen that waste heat can be recovered even when the exhaust temperature of the engine is low.

FIG. 2 also shows the MFI type zeolite used in Example 1 (silica / alumina ratio 32), the β type zeolite used in Example 2 (silica / alumina ratio 60), and the MFI type used in Example 6. The ethanol conversion characteristics of zeolite (silica / alumina ratio 600) are shown.
In zeolite with a low silica / alumina ratio, a dehydration reaction occurs even in a low temperature range of 200 ° C. or lower, while in a zeolite with a high silica / alumina ratio, it operates from a high temperature range exceeding 400 ° C.
As a result of identifying these reaction products, diethyl ether was the main product mainly at a low temperature condition of 200 ° C. or lower, and ethylene was a main product at a higher temperature range. Hydrogen, carbon monoxide, carbon dioxide, and methane were hardly detected.

1 is a schematic diagram illustrating an example of a fuel supply system for an internal combustion engine, which is an embodiment of a fuel supply system for a power source according to the present invention. It is a graph which shows the relationship between a catalyst entrance temperature and ethanol conversion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power source 12 Exhaust system 20 Conversion fuel supply means 22 Heat exchange means with ethanol conversion function 24 Heat exchange system 24a Water tank 26 Conversion fuel storage means 28 Gas conversion fuel injection means 30 Ethanol-containing fuel storage means 40 Ethanol-containing fuel supply 40 Means 42: Fuel injection means containing ethanol for liquid

Claims (22)

A power source that works with the generation of heat,
A conversion fuel supply means for supplying a conversion fuel containing at least one of diethyl ether and ethylene to the power source according to operating conditions of the power source;
A power source fuel supply system comprising:
The conversion fuel supply means includes a heat exchange means having an ethanol conversion function,
The heat exchanging means having the ethanol conversion function recovers heat generated by the power source or its exhaust system, and converts the ethanol-containing fuel containing ethanol into a converted fuel containing at least one of diethyl ether and ethylene. A power source fuel supply system comprising an ethanol conversion catalyst.   2. The power source fuel supply system according to claim 1, wherein the conversion fuel supply means includes conversion fuel storage means.   3. The power source fuel supply system according to claim 1, wherein the conversion fuel supply means includes a heat exchange means having a by-product water separation function.   The power supply fuel supply system according to any one of claims 1 to 3, wherein the conversion fuel supply means includes a heat exchange means having an ethanol-containing fuel vaporization function.   5. The power source fuel supply system according to claim 4, wherein the heat exchange means having the by-product water separation function and the heat exchange means having the ethanol-containing fuel vaporization function constitute one heat exchange system. .   6. The power source fuel supply system according to claim 1, wherein the conversion fuel supply means includes gas conversion fuel injection means.   The power supply fuel supply system according to any one of claims 1 to 6, wherein the conversion fuel supply means includes conversion fuel pressurization means.   The power supply fuel supply system according to any one of claims 1 to 7, wherein the conversion fuel supply means includes liquid conversion fuel injection means.   The power supply fuel supply system according to any one of claims 1 to 8, further comprising an ethanol-containing fuel supply means.   The power supply fuel supply system according to any one of claims 1 to 9, wherein the ethanol conversion catalyst contains an aluminosilicate having a silica / alumina ratio of 18 or more and 60 or less.   The aluminosilicate is an MFI zeolite having a silica / alumina ratio of 20 to 45, a β-type zeolite having a silica / alumina ratio of 20 to 60, and a mordenite zeolite having a silica / alumina ratio of 18 to 35. 11. The power source fuel supply system according to claim 10, wherein the power source fuel supply system is at least one selected from the group consisting of Y-type zeolite having a silica / alumina ratio of 18 or more and 35 or less.   The power supply fuel supply system according to any one of claims 1 to 11, wherein the ethanol conversion catalyst contains an aluminosilicate having a silica / alumina ratio of more than 60.   The aluminosilicate is composed of an MFI type zeolite having a silica / alumina ratio exceeding 60, a β type zeolite having a silica / alumina ratio exceeding 60, a mordenite type zeolite having a silica / alumina ratio exceeding 60, and a silica / alumina ratio. The power supply fuel supply system according to claim 12, wherein the fuel source supply system is at least one selected from the group consisting of Y-type zeolites having a Z exceeding 60.   The power supply fuel supply system according to any one of claims 1 to 13, wherein the ethanol conversion catalyst contains palladium.   15. The power source according to any one of claims 1 to 14, wherein the ethanol conversion catalyst is contained in a catalyst layer formed on a metal carrier having three-dimensional continuous pores. Fuel supply system.   The power source fuel supply system according to any one of claims 1 to 15, wherein the exhaust system of the power source includes an exhaust gas purifying catalyst.   The power source fuel supply system according to any one of claims 1 to 16, wherein the exhaust system of the power source includes a particulate filter type exhaust gas purification catalyst having a filter structure. The heat generated by the power source or its exhaust system activates the ethanol conversion catalyst, and the ethanol conversion catalyst is brought into contact with the ethanol-containing fuel containing ethanol to convert it into a conversion fuel containing at least one of diethyl ether and ethylene. A fuel supply method to a power source, wherein the obtained converted fuel containing at least one of diethyl ether and ethylene is supplied to the power source,
A fuel supply method to a power source, characterized in that the converted fuel is supplied at the time of at least one operating condition selected from the group consisting of a start of the power source, a low load operation, and a medium load operation. .   When an ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of 18 or more and 60 or less is used as the ethanol conversion catalyst, the temperature of the ethanol conversion catalyst is set to 150 when activating the ethanol conversion catalyst. The method for supplying fuel to a power source according to claim 18, wherein the fuel supply temperature is set to be equal to or higher than the temperature of 450 ° C.   When using an ethanol conversion catalyst containing an aluminosilicate having a silica / alumina ratio of more than 60 as the ethanol conversion catalyst, the temperature of the ethanol conversion catalyst exceeds 450 ° C. in activating the ethanol conversion catalyst. The fuel supply method to the power source according to claim 18, wherein the temperature is set to 650 ° C or lower.   The ethanol-containing fuel containing ethanol is vaporized in advance when the ethanol-containing fuel containing ethanol is brought into contact with the ethanol conversion catalyst. The power source according to any one of claims 18 to 20, Fuel supply method.   The water contained in the converted fuel containing at least one of diethyl ether and ethylene is separated in advance when the converted fuel containing at least one of diethyl ether and ethylene is supplied to the power source. The fuel supply method to the power source as described in any one of the above items.

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