WO2001077260A1

WO2001077260A1 - Fuel for use in fuel cell system

Info

Publication number: WO2001077260A1
Application number: PCT/JP2001/003089
Authority: WO
Inventors: Kenichirou Saitou; Iwao Anzai; Osamu Sadakane; Michiro Matsubara
Original assignee: Nippon Oil Corporation
Priority date: 2000-04-10
Filing date: 2001-04-10
Publication date: 2001-10-18
Also published as: JP4598890B2; AU4688501A; JPWO2001077260A1

Abstract

A fuel for use in a fuel cell system which contains hydrocarbon compounds having four carbon atoms in an amount of 15 vol % or less, hydrocarbon compounds having five carbon atoms in an amount of 5 vol % or more, hydrocarbon compounds having six carbon atoms in an amount of 10 vol % or more, hydrocarbon compounds having seven or eight carbon atoms in an total amount of 20 vol % or more, and hydrocarbon compounds having ten or more carbon atoms in an amount of 20 vol % or less. The fuel exhibits an increased energy output generated per it s weight and per amount of CO2 formed, an improved fuel consumption, a decreased evaporative emission, good handling properties such as good storage stability and a suitable flash point, and reduced calories required for preheating. Further, the fuel allows a fuel cell system using the fuel to keep its initial performance for a long period of time, since it reduces the deterioration of a fuel cell system including a reforming catalyst, a water gas shift reaction catalyst, a carbon monoxide removal catalyst and a fuel cell stack.

Description

Fuel for fuel cell system

Technical field

Light

The present invention relates to a fuel used for a fuel cell system. book

Background art

In recent years, the growing sense of crisis for the global environment in the future has called for the ability to develop earth-friendly energy supply systems. In particular, the reduction of co ₂ for prevention of global warming, THC (unreacted hydrocarbons in the exhaust gas), NO x, PM (particulate matter in exhaust gas: soot, high-boiling-fuel-lubricant the reduction of the unburned components) hazardous substances polymer is that force ^s required highly achieved. Specific examples of the system include an automobile power system replacing the conventional Otto's diesel system, or a power generation system replacing the thermal power.

Thus we have the energy efficiency close to the ideal, is basically a fuel cell that does not appear ^ H ₂ 0 and C 0 ₂ Mr. mosquitoes, it is expected to promising systems also have to meet the needs of society. To achieve such a system, it is indispensable to develop not only equipment technology but also the optimal fuel for it.

Conventionally, hydrogen, methanol, and hydrocarbon fuels have been considered as fuels for fuel cell systems.

As a fuel for fuel cell systems, hydrogen is advantageous in that it does not require a special reformer, but because it is a gas at room temperature, it has problems with storage and mounting on vehicles, etc. Special equipment power is required. Also, there is a high risk of bow I fire, so care must be taken when handling.

On the other hand, methanol is advantageous in that it is relatively easy to reform hydrogen, but the power generation capacity per weight ^! Because it is toxic, it requires careful handling. In addition, since it is corrosive, special equipment is required for storage and supply. As described above, no fuel has yet been developed to achieve the full potential of the fuel cell system. In particular, as the fuel for a fuel cell system, it is often the power generation amount per weight, it generation amount of C 0 ₂ emissions per often, good fuel economy power ^s of the entire fuel cell system, evaporative emission (evaporative E Mission ) Low power, reforming catalyst, water gas shift reaction catalyst, carbon monoxide removal catalyst, fuel cell stack, etc. If the deterioration of the fuel cell system is small and the initial capacity can be maintained for a long time, the system startup time power s It must be short, have good storage stability, and have good handling properties such as the bow I fire point.In a fuel cell system, it is necessary to maintain the temperature of the fuel and reformer at a given temperature. The amount of power generated by subtracting the required amount of heat (the amount of heat that balances the preheating and endothermic heat generated by the reaction) is the power generation of the entire fuel cell system. Therefore, the temperature force required for reforming the fuel ⁵ 'low force 5' preheating energy J is more advantageous, and the system start-up time force S is shorter and more advantageous. It is also necessary that the calorific value per weight be small. Insufficient preheating can result in high unreacted hydrocarbons (THC) in the exhaust gas, not only reducing power generation per weight but also causing air pollution. Conversely, when the same system is operated at the same temperature, it is advantageous that the power of the resin is higher than that of the resin 11 (the amount of power is 5% less). It is an object of the present invention to provide a fuel suitable for a fuel cell system satisfying the above requirements with good balance.

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a fuel containing a specific amount of a carbon hydride compound having a specific carbon number is suitable for a fuel cell system.

That is, the fuel for a fuel cell system according to the present invention is:

(1) The content of hydrocarbon compounds having 4 carbon atoms is 15% by volume or less, the content of hydrocarbon compounds having 5 carbon atoms is 5% by volume or more, and the content of hydrocarbon compounds having 6 carbon atoms is contained. Is 10% by volume or more, the total content of hydrocarbon compounds having 7 and 8 carbon atoms is 20% by volume or more, and the total content of hydrocarbon compounds having 10 or more carbon atoms is 2% by volume. It is not more than 0% by volume.

It is more preferable that the fuel containing the specific amount of the carbon hydride compound having the specific carbon number satisfy the following additional requirements.

(2) Fuel for a fuel cell system having a sulfur content of 50 mass ppm or less.

(3) A fuel for a fuel cell system having a saturated content of 30% by volume or more.

(4) Fuel for a fuel cell system having an olefin content of 35% by volume or less.

(5) A fuel for a fuel cell system having an aromatic content of 50% by volume or less.

(6) Fuel for a fuel cell system in which the proportion of paraffin in the saturated content is 60% by volume or more.

(7) Fuel for fuel cell systems in which the proportion of branched paraffin in the paraffin content is 30% by volume or more. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a flowchart of a steam reforming type fuel cell system used for evaluating the fuel for a fuel cell system of the present invention. FIG. 2 is a front chart of a partial oxidation fuel cell system used for evaluating fuel for a fuel cell system of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the contents of the present invention will be described in more detail.

In the present invention, the amount of the hydrocarbon compound having a specific carbon number is as follows. The content of hydrocarbon compounds with 4 carbon atoms (V (C ₄ )) indicates the content of hydrocarbon compounds with 4 carbon atoms based on the total amount of fuel, and keeps the amount of evaporative gas (evaporation) low. From the point of ³ 'good, such as flash point, it is necessary to be 15% by volume or less, force is required, 10% by volume or less force is preferable, 5% by volume or less Force most preferred.

The content of the hydrocarbon compounds having 5 carbon atoms (V (C ₅₎₎ indicates the content of hydrocarbon compounds having a carbon number of 5 relative to the fuel total amount, it is often the power generation amount per weight, CO ₂ occurs It must be at least 5% by volume because of the large amount of power generated per unit and the good fuel efficiency of the fuel cell system as a whole, and at least 10% by volume. Force s, preferably 15% by volume or more, more preferably 20% by volume or more, even more preferably 25% by volume or more, and more preferably 30% by volume or more. s most preferred.

The content of hydrocarbon compounds with 6 carbon atoms (V (C ₆ )) indicates the content of hydrocarbon compounds with 6 carbon atoms based on the total amount of fuel. 10% by volume or more is required because of the overall fuel efficiency, s, good, etc. Power S is required, 15% by volume or more is preferable, 20% by volume or more is more preferable, and 25% by volume is more preferable More preferably, it is more preferably at least 30% by volume.

In the present invention, the total content (V. (C ₇ ten C _8)), the hydrocarbon compound fuels total amount number 7 and the carbon relative to the 8 hydrocarbon compounds having 7 and 8 carbon atoms the total amount, it is often the power generation amount per weight, C0 ₂ that the power generation amount of emissions per often, the fuel cell system as a whole fuel power s of, etc. good, is 20 capacity% or more Force ⁵ 'is required, preferably at least 25% by volume, more preferably at least 30% by volume, even more preferably at least 35% by volume, and at least 40% by volume preferable.

Further, in the present invention, the content of the hydrocarbon compound having 10 or more carbon atoms means that the amount of power generation per CO ₂ generation amount is large, the fuel efficiency of the fuel cell system as a whole is good, and the deterioration of the Bji catalyst is low. Small initial capacity s Because of the ability to last for a long time, etc., the total amount of hydrocarbon compounds having 10 or more carbon atoms (V (do +)) should be 20% by volume or less based on the total amount of fuel. %, More preferably 5% by volume or less.

Note that V (C ₄ ), V (C ₅ ), V (C ₆ ), V (Cv + Ce), and V (C io +) described above are values determined by the gas chromatography method shown below. is there . In other words, a column of methyl silicon capillary ram is used for the column, helium or nitrogen is used for the carrier gas, and a hydrogen ionization detector (FID) is used for the detector.The power ram length is 25 to 50 m, and the carrier gas flow is 0.5 to 1.5 ml Zmin, split ratio 1: 50-1: 250, inlet temperature 150-250 ° C, initial column temperature—10-10 ° C, final column temperature 150-250. C, detector temperature 150-250 ° C It is a value measured under the conditions.

Although there is no limitation on the sulfur content of the fuel of the present invention, the deterioration of the fuel cell system such as a reforming catalyst, a water gas shift reaction catalyst, a carbon monoxide removal catalyst, a fuel cell stack, etc. is small and the initial capacity S is small. In view of the fact that the fuel can be maintained for a long time, it is preferable that the amount is 50 mass ppm or less, more preferably 30 mass ppm or less, even more preferably 10 mass ppm or less, based on the total fuel amount. it is even more preferably more that ppm or less, 0.1 ppm by mass or less der Rukoto force ⁵ 'most preferred.

Here, when the sulfur content is 1 mass ppm or more, the sulfur content measured according to JISK 2541 “Sulfur content test method for crude oil and petroleum products” is used.If the sulfur content is less than 1 mass PPm, ASTM D4045-96 “Standard Test It means the sulfur content measured by the "Method for Sulfur in Petroleum Products by Hydrogenolysis and Rateometric Colorimetr".

In the present invention, the content of each of the saturated component, the olefin component and the aromatic component is not limited, but the saturated component (V (S)) is 30% by volume or more, and the olefin component (V (0)) is 35% by volume. % Or less, and the aromatic content (V (Ar)) is preferably 50% by volume or less. Hereinafter, these will be individually described.

V (S) is often power generation amount per weight, C0 that power generation amount per ₂ generation amount is large, good fuel economy force of the entire fuel cell system, it is not less THC force S in the exhaust gas, the system Because of the short start-up force S, it should be at least 30% by volume, preferably at least 40% by volume, more preferably at least 50% by volume, even more preferably at least 60% by volume. Even more preferably, it is even more preferably 70% by volume or more, even more preferably 80% by volume or more, even more preferably 90% by volume or more. It is most preferable that the capacity is not less than% by volume.

V (0), it generation amount per weight is large, C0 ₂ that the power generation amount of emissions per often, Furudo deterioration of the reforming catalyst can last reduced initial resistance capability S for a long time, the storage stability is excellent Therefore, the force S is preferably 35% by volume or less, more preferably 25% by volume or less, and still more preferably 20% by volume or less. Even more preferably, it is 5% by volume or less, and most preferably, it is 10% by volume or less. .

V (A r) are often power generation amount per weight, C 0 generation per ₂ generation amount multi Ikoto, good fuel economy force S of the entire fuel cell system, it THC is less in the exhaust gas Since the system startup time is short, the deterioration of the reforming catalyst is small and the initial performance power ^s can be ^{maintained for a} long time, the power s' is preferably 50% by volume or less, and more preferably 45% by volume or less. More preferably, it is even more preferably 40% by volume or less, still more preferably 35% by volume or less, even more preferably 30% by volume or less, and more preferably 20% by volume or less. still more preferably Ri by further that, 1 0 more preferably from more or less volume percent, that force ^s most preferably less than 5 volume%.

It is most preferable that the preferred range of the sulfur content and the preferred range of the aromatic content be satisfied while two, since the deterioration of the three-way catalyst is small and the initial performance can be maintained for a long time.

The above V (S), V (0) and V (A r) are all values measured by the fluorescent indicator adsorption method of JIS K 2'53 36 "Petroleum products-hydrocarbon type test method".

Further, in the present invention is not in any way limit for the percentage of saturates in Me paraffin component of the fuel, and the like are often power generation amount per weight, it generation amount of C 0 ₂ emissions per often, saturated components Preferably, the paraffin content is at least 60% by volume, more preferably at least 65% by volume, even more preferably at least 70% by volume, and at least 75% by volume. Is still more preferably 80% by volume or more, still more preferably 85% by volume or more, even more preferably 85% by volume or more, and even more preferably 90% by volume or more. Most preferably, it is 95% by volume or more.

The above-mentioned saturated content and paraffin content are values determined by the above-described gas chromatography method.

Further, such is no limitation on the proportion of branched paraffins in the paraffinic fraction bur often power generation amount per weight, it C 0 generation per ₂ generation amount is large, fuel The fuel efficiency of the fuel cell system as a whole S is good, the THC in the exhaust gas is small, and the startup time of the system is short s. The percentage of branched paraffin in the paraffin should be 30% by volume or more. The force S is preferably 50% by volume or more, more preferably 50% by volume or more, and most preferably 70% by volume or more.

The above-mentioned paraffin content and the amount of branched paraffin are values determined by the above-mentioned gas chromatography method.

There is no particular limitation on the method for producing the fuel of the present invention. Specifically, for example, light naphtha obtained by atmospheric distillation of crude oil, heavy naphtha obtained by atmospheric distillation of crude oil, desulfurized full-range naphtha B obtained by desulfurizing a naphtha fraction obtained by distilling crude oil Add low-level olefins to hydrocarbons such as desulfurized light naphtha obtained by desulfurizing light naphtha, desulfurized heavy naphtha obtained by desulfurizing heavy naphtha, light naphtha into isoparaffin by using an isomerization unit, and isomeric gasoline and isobbutane. , (Alkylation), low-sulfur alkylate with desulfurized hydrocarbon such as desulfurized alkylate, desulfurized isobutane and desulfurized lower olefin, catalytic reforming method Reformed gasoline, raffinate which is a residue obtained by extracting aromatics from reformed gasoline, light fraction of reformed gasoline, Medium-weight fraction of reformed gasoline, heavy fraction of 5-gazoline, cracked gasoline obtained by catalytic cracking, hydrocracking, etc., light fraction of cracked gasoline, heavy fraction of cracked gasoline, Desulfurized cracked gasoline by desulfurizing cracked gasoline, desulfurized light cracked gasoline by desulfurizing light fraction of cracked gasoline, desulfurized heavy cracked gasoline by desulfurizing heavy fraction of cracked gasoline, carbon monoxide by natural gas One or two or more base materials such as light fraction of "GTL (Gas to Liquids)" obtained by F-T (Fischer-Tropsch) synthesis after decomposing into hydrogen and desulfurized LPG obtained by desulfurizing LPG It is manufactured using Further, it can also be produced by mixing one or more of the above-mentioned base materials and then desulfurizing by hydrogenation or adsorption or the like.

Among them, preferred as the fuel production base material of the present invention are light naphtha, desulfurized full-range naphtha obtained by desulfurizing a naphtha fraction obtained by distilling crude oil, desulfurized light naphtha, isomerized gasoline, and alkylate. Desulfurized hydrocarbons such as desulfurized alkylate and desulfurized isobutane and desulfurized lower-olefin Low-sulfurized alkylate, desulfurized light cracked gasoline obtained by desulfurizing a light fraction of cracked gasoline, light fraction of GTL, desulfurized LPG obtained by desulfurizing LPG, etc. Colorant for identification, antioxidant for oxidation stability improvement, metal deactivator, corrosion inhibitor for corrosion prevention, detergent for fuel line cleanliness, lubricity improvement For this purpose, additives such as a lubricity improver can also be added.

The colorant is preferably 10 ppm or less, more preferably 5 ppm or less, since the deterioration of the reforming catalyst is small and the initial ability s can be maintained for a long time. For the same reason, the antioxidant is preferably 300 ppm or less, more preferably 200 ppm or less, still more preferably 1 ppm or less, and most preferably 1 ppm or less. For the same reason, the metal deactivator is preferably 50 ppm or less, more preferably 30 ppm or less, still more preferably 1 Oppm or less, and most preferably 5 ppm or less. Similarly, since the deterioration of the reforming catalyst is small and the initial performance can be maintained for a long time, the corrosion inhibitor is preferably 5 Oppm or less, more preferably 3 Oppm or less, further preferably 1 Oppm or less, more preferably 5 ppm or less. Most preferred. For the same reason, the content of the detergent is preferably 300 ppm or less, more preferably 200 pm or less, and preferably 100 ppm or less. For the same reason, the lubricity improver preferably has a force of 300 ppm or less, more preferably 200 ppm or less, and even more preferably 100 ppm or less.

The fuel of the present invention is used as a fuel for a fuel cell system. The fuel cell system according to the present invention includes a fuel reformer, a carbon monoxide purifying device, a fuel cell, and the like, and the fuel of the present invention is suitably used for any fuel cell system.

The fuel reformer is for reforming the fuel to obtain hydrogen, which is the fuel of the fuel cell. As a reformer, specifically, for example,

(1) A steam reforming reformer that mixes fuel with heated gas and steam and heats it in a catalyst such as copper, nickel, platinum, or ruthenium to obtain a product containing hydrogen as a main component. ,

(2) Mix the heated and vaporized fuel with the air, and add copper, nickel, platinum, ruthenium, etc. A reaction mainly in a catalyst or without a catalyst to obtain a product mainly composed of hydrogen Partial oxidation reformer,

(3) The heated and vaporized fuel is mixed with steam and air, and the partial oxidation reforming of (2) is performed in the former stage of the catalyst layer of copper, nickel, platinum, ruthenium, etc., and in the latter stage, the partial oxidation reaction The steam reforming of (1) is performed by utilizing the heat generation of the steam to form a partial oxygen-steam reforming reformer that obtains a product containing hydrogen as a main component.

And the like.

The carbon monoxide purifier removes carbon monoxide contained in the gas generated by the above reformer and becomes a catalyst poison of the fuel cell.

(1) The reformed gas and the heated steam are mixed and reacted in a catalyst such as copper, nickel, platinum, and ruthenium to produce carbon dioxide and hydrogen as products from carbon monoxide and steam. Water gas shift reactor to obtain,

(2) A selective oxidation reactor that converts carbon monoxide into carbon dioxide by mixing the reformed gas with compressed air and reacting it in a catalyst such as platinum or ruthenium is mentioned. used.

Specific examples of fuel cells include polymer electrolyte fuel cells (PEFC), phosphoric acid fuel cells (PAFC), molten carbonate fuel cells (MCFC), and solid oxide fuel cells (SOFC). ) And the like.

The fuel cell system as described above is used for electric vehicles, conventional hybrid vehicles with an engine and electricity, portable power supplies, distributed power supplies, home power supplies, cogeneration systems, and the like. Example

The properties of the base material used for each fuel in the examples and comparative examples are shown in Tables 1 and 2.The heat capacity and latent heat of vaporization are the contents of each component determined by the gas chromatography method described above. And the unit for each component described in “Vo 1.1, Cha. 1 Gene ra 1 Data, Table 1 C 1” of “Techni cal Data Book—Petro 1 eum Refining”. It was calculated based on the numerical value per weight.

Table 3 shows the properties of each fuel used in Examples and Comparative Examples.

Table 1

11

Replacement form (Rule 26) Table 1 (continued)

12

Replacement form (Rule 26)

13

Paper (Rule 26) Table 2 (continued)

14

Replacement form (Rule 26) Mixing ratio LPG 2% 2% Desulfurized LPG 2% Desulfurized full-range naphtha 100%

Desulfurized full-range naphtha B

GTL Naphtha 100%

Isomerized gasoline 10% 10% Alkylate 10% 20% Low-sulfur alkylene 10% Suzolefolanrafine 10% 10% Light cracked gasoline 40% Heavy cracked gasoline 5%

Cracked gasoline 40%

Desulfurized light cracked gasoline

Desulfurized cracked gasoline 45% Reformed gasoline 17% 17% Light reformed gasoline 3% 4% 3% Medium heavy reformed gasoline 30% Heavy reformed gasoline 3% 4% 3% Property Sulfur content ppm 0.3 0.1 39.0 4.0 0.6 Carbon number ratio

Carbon number 4 volume% 1.6 2.1 6.8 9.8 7.3 Carbon number 5 volume% 12.5 12.4 18.2 21.5 19.6 Carbon number 6 volume% 19.7 19J 22.8 13J 23.6 Carbon number 7. Volume% 20.9 21.0 18.3 14.9 18.0 Carbon number 8 volume% 24.3 23.6 20.2 30.9 19.7 Carbon number 7 + 8% by volume 45.2 44.6 38.5 45.8 37.7 Carbon number 9% by volume 18.5 17.7 9.3 6.9 8.6 Carbon number 10 or more Volume% 2.5 3.5 4.3 2.3 3.2 Composition

Saturation content volume% '92.8 100.0 58.7 45.2 62.1 years old Refin content volume 0.0 0.0 18.5 21.6 15.8 Aromatic content volume 6.6 0.0 22.8 33.2 22.0 Paraffin content% in saturation content 85.5 100.0 94.0 97.3 94.7 ° Raffine Volume% 44.4 53.5 80.5 83.0 80.9 Density g / cm3 0.7085 0.6825 0.7316 0.7348 0.7257 Start ^ 1 鼋 kJ / kg 44230 44580 43560 43190 43580 Heat capacity (liquid) kJ / kg- ° C 2.105 2.167 2.027 1.970 2.048 Heat capacity (gas) kJ / kg- ° C 1.523 1.590 1.444 1.401 1.458 Latent heat kJ / kg 317.2 309.5 329.9 336.2 330.0

Fifteen

Replacement form (Rule 26) Table 3 (continued)

Example 6 I Example ⁶ Comparative Example 1 Comparative Example ²

16

Replacement form (Rule 26) For each of these fuels, a fuel cell system evaluation test, evaporative gas test, and storage stability test were performed.

Fuel cell system evaluation test

(1) Steam reforming type

The fuel and water were vaporized by electric heating and charged to a reformer, which was filled with a noble metal catalyst and maintained at a specified temperature with an electric heater, to generate reformed gas rich in hydrogen.

The temperature of the reformer was set to the lowest temperature at which reforming was performed completely at the initial stage of the test (the lowest temperature at which the reformed gas did not contain THC power).

The reformed gas is guided to a carbon monoxide treatment device (water gas shift reaction) together with water vapor, and the carbon monoxide in the reformed gas is converted to carbon dioxide. The generated gas is then guided to a polymer electrolyte fuel cell to generate electricity. Done.

Fig. 1 shows a flowchart of the steam reforming type fuel cell system used for the evaluation.

(2) Partial oxidation type

The fuel was vaporized by electric heating, filled with a precious metal catalyst together with preheated air, and led to a reformer maintained at 110 ° C by an electric heater to generate a hydrogen-rich reformed gas.

The reformed gas is led to a carbon monoxide treatment device (water gas shift reaction) together with water vapor to convert carbon monoxide in the reformed gas into carbon dioxide, and the generated gas is guided to a polymer electrolyte fuel cell to generate electricity. Was. ,

Figure 2 shows a flowchart of the partial oxidation fuel cell system used for the evaluation.

(3) Evaluation method

Evaluation H _2, CO in the reformed gas generated from the reformer immediately after the start of the test, were measured for C 0 _2, THC amount. Also, H _2, CO, fuel C 0 _2, immediately after the evaluation test started was measured for THC content and start 1 0 0 hour after the reformed gas generated carbon monoxide processor power et immediately after the start of the evaluation test We measured the amount of power generated by the battery, the amount of fuel consumed, and the amount of CO ₂ emitted from the fuel cell. The amount of heat (preheat amount) required to guide each fuel to a predetermined reformer temperature was calculated from the heat capacity and latent heat of vaporization.

From these measured values' calculated values and fuel calorific value, Bj (performance degradation rate of the quality catalyst (power generation 100 hours after test start / power generation immediately after test start)), thermal efficiency (power generation immediately after test start) Z fuel calorific value) and preheat amount ratio (preheat amount Z power generation amount) were calculated.

A sample filling hose was attached to the filler port of a 20-litre gasoline carrying can, and the attachment part was completely sealed. Each liter was filled with 5 liters of fuel while the vent valve of the can was open. After filling, the air vent valve was closed and left for 30 minutes. After standing, an activated carbon adsorption device was attached to the tip of the air release valve, and the valve was opened. Immediately, 10 liters of each fuel was supplied from the filler port. Five minutes after refueling, leaving the air release valve open, the activated carbon was allowed to absorb steam, and then the weight of the activated carbon was measured. The test was performed at a constant temperature of 25 ° C.

Storage stability test

Each fuel was filled in a pressure-resistant sealed container together with oxygen, heated to 100 ° C., allowed to stand for 24 hours while maintaining the temperature, and evaluated by the real gum test method specified in JIS K2261.

Table 4 shows the measured values and calculated values.

Table 4

Dagger Comparative Example 1

Power generation by steam reforming Br method

(Reformer temperature-optimal reformer temperature ¹ ))

Optimum plasticizer temperature ¹ 〉 ° c

Electric energy KJ / fuel kg Initial performance

After 100 hours

Performance degradation ratio After 100 hours

Thermal efficiency Initial performance

C02 generation amount.S 2 properties 3 kg / fuel kg Initial performance

Energy per C02 '-KJ ^ ^ / C02-kg Initial performance

Preheating amount ³⁾ KJ / twisting material kg

Preheating ratio ⁴ )

Combination

*! Power generation by 5-minute oxidation reforming method (reformer temperature 1 100 ° C)

First time first time 11

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B

Thermal efficiency ² ) After

C02 generation amount

Enerki per C02

3)

Four)

Preheat rate

Evaporative gas test

Evaporated gas generation g / test

Storage stability test

Real gum mg / 1 00ml

1) Minimum temperature at which THC is not contained in the reformed gas

2) Electric energy Z fuel heating value

3) 'The amount of heat required to bring the fuel to a given reformer temperature

4) Preheating amount Electric energy

Industrial applicability

As described above, the fuel for a fuel cell system of the present invention is a fuel that can obtain high-output electric energy with a small performance deterioration ratio and that satisfies various performances for a fuel cell.

Claims

The scope of the claims

1. The content of hydrocarbon compounds having 4 carbon atoms is 15% by volume or less, the content of hydrocarbon compounds having 5 carbon atoms is 5% by volume or more, and the content of hydrocarbon compounds having 6 carbon atoms Is 10% by volume or more, the total content of hydrocarbon compounds having 7 and 8 carbon atoms is 20% by volume or more, and the total content of hydrocarbon compounds having 10 or more carbon atoms is 2% by volume.

0% by volume or less of fuel for a fuel cell system.

2. The fuel for a fuel cell system according to claim 1, wherein the sulfur content is 50 mass ppm or less.

3. The fuel for a fuel cell system according to claim 1, wherein the saturated content is 30% by volume or more.

4. The fuel for a fuel cell system according to any one of claims 1 to 3, wherein the olefin component is 35% by volume or less.

5. The fuel for a fuel cell system according to any one of claims 1 to 4, wherein the aromatic component is 50% by volume or less.

6. The fuel for a fuel cell system according to any one of claims 1 to 5, wherein the proportion of the paraffin component in the saturated component is 60% by volume or more.

7. The fuel for a fuel cell system according to any one of claims 1 to 6, wherein the proportion of the branched paraffin in the paraffin content is 30% by volume or more.